quota: port to mnt_idmap

[thirdparty/linux.git] / fs / f2fs / file.c

// SPDX-License-Identifier: GPL-2.0
/*
 * fs/f2fs/file.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/stat.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/falloc.h>
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/mount.h>
#include <linux/pagevec.h>
#include <linux/uio.h>
#include <linux/uuid.h>
#include <linux/file.h>
#include <linux/nls.h>
#include <linux/sched/signal.h>
#include <linux/fileattr.h>
#include <linux/fadvise.h>
#include <linux/iomap.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
#include "gc.h"
#include "iostat.h"
#include <trace/events/f2fs.h>
#include <uapi/linux/f2fs.h>

static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf)
{
        struct inode *inode = file_inode(vmf->vma->vm_file);
        vm_fault_t ret;

        ret = filemap_fault(vmf);
        if (!ret)
                f2fs_update_iostat(F2FS_I_SB(inode), inode,
                                        APP_MAPPED_READ_IO, F2FS_BLKSIZE);

        trace_f2fs_filemap_fault(inode, vmf->pgoff, (unsigned long)ret);

        return ret;
}

static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
{
        struct page *page = vmf->page;
        struct inode *inode = file_inode(vmf->vma->vm_file);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct dnode_of_data dn;
        bool need_alloc = true;
        int err = 0;

        if (unlikely(IS_IMMUTABLE(inode)))
                return VM_FAULT_SIGBUS;

        if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
                return VM_FAULT_SIGBUS;

        if (unlikely(f2fs_cp_error(sbi))) {
                err = -EIO;
                goto err;
        }

        if (!f2fs_is_checkpoint_ready(sbi)) {
                err = -ENOSPC;
                goto err;
        }

        err = f2fs_convert_inline_inode(inode);
        if (err)
                goto err;

#ifdef CONFIG_F2FS_FS_COMPRESSION
        if (f2fs_compressed_file(inode)) {
                int ret = f2fs_is_compressed_cluster(inode, page->index);

                if (ret < 0) {
                        err = ret;
                        goto err;
                } else if (ret) {
                        need_alloc = false;
                }
        }
#endif
        /* should do out of any locked page */
        if (need_alloc)
                f2fs_balance_fs(sbi, true);

        sb_start_pagefault(inode->i_sb);

        f2fs_bug_on(sbi, f2fs_has_inline_data(inode));

        file_update_time(vmf->vma->vm_file);
        filemap_invalidate_lock_shared(inode->i_mapping);
        lock_page(page);
        if (unlikely(page->mapping != inode->i_mapping ||
                        page_offset(page) > i_size_read(inode) ||
                        !PageUptodate(page))) {
                unlock_page(page);
                err = -EFAULT;
                goto out_sem;
        }

        if (need_alloc) {
                /* block allocation */
                f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
                set_new_dnode(&dn, inode, NULL, NULL, 0);
                err = f2fs_get_block(&dn, page->index);
                f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
        }

#ifdef CONFIG_F2FS_FS_COMPRESSION
        if (!need_alloc) {
                set_new_dnode(&dn, inode, NULL, NULL, 0);
                err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
                f2fs_put_dnode(&dn);
        }
#endif
        if (err) {
                unlock_page(page);
                goto out_sem;
        }

        f2fs_wait_on_page_writeback(page, DATA, false, true);

        /* wait for GCed page writeback via META_MAPPING */
        f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);

        /*
         * check to see if the page is mapped already (no holes)
         */
        if (PageMappedToDisk(page))
                goto out_sem;

        /* page is wholly or partially inside EOF */
        if (((loff_t)(page->index + 1) << PAGE_SHIFT) >
                                                i_size_read(inode)) {
                loff_t offset;

                offset = i_size_read(inode) & ~PAGE_MASK;
                zero_user_segment(page, offset, PAGE_SIZE);
        }
        set_page_dirty(page);
        if (!PageUptodate(page))
                SetPageUptodate(page);

        f2fs_update_iostat(sbi, inode, APP_MAPPED_IO, F2FS_BLKSIZE);
        f2fs_update_time(sbi, REQ_TIME);

        trace_f2fs_vm_page_mkwrite(page, DATA);
out_sem:
        filemap_invalidate_unlock_shared(inode->i_mapping);

        sb_end_pagefault(inode->i_sb);
err:
        return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
        .fault          = f2fs_filemap_fault,
        .map_pages      = filemap_map_pages,
        .page_mkwrite   = f2fs_vm_page_mkwrite,
};

static int get_parent_ino(struct inode *inode, nid_t *pino)
{
        struct dentry *dentry;

        /*
         * Make sure to get the non-deleted alias.  The alias associated with
         * the open file descriptor being fsync()'ed may be deleted already.
         */
        dentry = d_find_alias(inode);
        if (!dentry)
                return 0;

        *pino = parent_ino(dentry);
        dput(dentry);
        return 1;
}

static inline enum cp_reason_type need_do_checkpoint(struct inode *inode)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        enum cp_reason_type cp_reason = CP_NO_NEEDED;

        if (!S_ISREG(inode->i_mode))
                cp_reason = CP_NON_REGULAR;
        else if (f2fs_compressed_file(inode))
                cp_reason = CP_COMPRESSED;
        else if (inode->i_nlink != 1)
                cp_reason = CP_HARDLINK;
        else if (is_sbi_flag_set(sbi, SBI_NEED_CP))
                cp_reason = CP_SB_NEED_CP;
        else if (file_wrong_pino(inode))
                cp_reason = CP_WRONG_PINO;
        else if (!f2fs_space_for_roll_forward(sbi))
                cp_reason = CP_NO_SPC_ROLL;
        else if (!f2fs_is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
                cp_reason = CP_NODE_NEED_CP;
        else if (test_opt(sbi, FASTBOOT))
                cp_reason = CP_FASTBOOT_MODE;
        else if (F2FS_OPTION(sbi).active_logs == 2)
                cp_reason = CP_SPEC_LOG_NUM;
        else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT &&
                f2fs_need_dentry_mark(sbi, inode->i_ino) &&
                f2fs_exist_written_data(sbi, F2FS_I(inode)->i_pino,
                                                        TRANS_DIR_INO))
                cp_reason = CP_RECOVER_DIR;

        return cp_reason;
}

static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
{
        struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
        bool ret = false;
        /* But we need to avoid that there are some inode updates */
        if ((i && PageDirty(i)) || f2fs_need_inode_block_update(sbi, ino))
                ret = true;
        f2fs_put_page(i, 0);
        return ret;
}

static void try_to_fix_pino(struct inode *inode)
{
        struct f2fs_inode_info *fi = F2FS_I(inode);
        nid_t pino;

        f2fs_down_write(&fi->i_sem);
        if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
                        get_parent_ino(inode, &pino)) {
                f2fs_i_pino_write(inode, pino);
                file_got_pino(inode);
        }
        f2fs_up_write(&fi->i_sem);
}

static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
                                                int datasync, bool atomic)
{
        struct inode *inode = file->f_mapping->host;
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        nid_t ino = inode->i_ino;
        int ret = 0;
        enum cp_reason_type cp_reason = 0;
        struct writeback_control wbc = {
                .sync_mode = WB_SYNC_ALL,
                .nr_to_write = LONG_MAX,
                .for_reclaim = 0,
        };
        unsigned int seq_id = 0;

        if (unlikely(f2fs_readonly(inode->i_sb)))
                return 0;

        trace_f2fs_sync_file_enter(inode);

        if (S_ISDIR(inode->i_mode))
                goto go_write;

        /* if fdatasync is triggered, let's do in-place-update */
        if (datasync || get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
                set_inode_flag(inode, FI_NEED_IPU);
        ret = file_write_and_wait_range(file, start, end);
        clear_inode_flag(inode, FI_NEED_IPU);

        if (ret || is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
                trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
                return ret;
        }

        /* if the inode is dirty, let's recover all the time */
        if (!f2fs_skip_inode_update(inode, datasync)) {
                f2fs_write_inode(inode, NULL);
                goto go_write;
        }

        /*
         * if there is no written data, don't waste time to write recovery info.
         */
        if (!is_inode_flag_set(inode, FI_APPEND_WRITE) &&
                        !f2fs_exist_written_data(sbi, ino, APPEND_INO)) {

                /* it may call write_inode just prior to fsync */
                if (need_inode_page_update(sbi, ino))
                        goto go_write;

                if (is_inode_flag_set(inode, FI_UPDATE_WRITE) ||
                                f2fs_exist_written_data(sbi, ino, UPDATE_INO))
                        goto flush_out;
                goto out;
        } else {
                /*
                 * for OPU case, during fsync(), node can be persisted before
                 * data when lower device doesn't support write barrier, result
                 * in data corruption after SPO.
                 * So for strict fsync mode, force to use atomic write sematics
                 * to keep write order in between data/node and last node to
                 * avoid potential data corruption.
                 */
                if (F2FS_OPTION(sbi).fsync_mode ==
                                FSYNC_MODE_STRICT && !atomic)
                        atomic = true;
        }
go_write:
        /*
         * Both of fdatasync() and fsync() are able to be recovered from
         * sudden-power-off.
         */
        f2fs_down_read(&F2FS_I(inode)->i_sem);
        cp_reason = need_do_checkpoint(inode);
        f2fs_up_read(&F2FS_I(inode)->i_sem);

        if (cp_reason) {
                /* all the dirty node pages should be flushed for POR */
                ret = f2fs_sync_fs(inode->i_sb, 1);

                /*
                 * We've secured consistency through sync_fs. Following pino
                 * will be used only for fsynced inodes after checkpoint.
                 */
                try_to_fix_pino(inode);
                clear_inode_flag(inode, FI_APPEND_WRITE);
                clear_inode_flag(inode, FI_UPDATE_WRITE);
                goto out;
        }
sync_nodes:
        atomic_inc(&sbi->wb_sync_req[NODE]);
        ret = f2fs_fsync_node_pages(sbi, inode, &wbc, atomic, &seq_id);
        atomic_dec(&sbi->wb_sync_req[NODE]);
        if (ret)
                goto out;

        /* if cp_error was enabled, we should avoid infinite loop */
        if (unlikely(f2fs_cp_error(sbi))) {
                ret = -EIO;
                goto out;
        }

        if (f2fs_need_inode_block_update(sbi, ino)) {
                f2fs_mark_inode_dirty_sync(inode, true);
                f2fs_write_inode(inode, NULL);
                goto sync_nodes;
        }

        /*
         * If it's atomic_write, it's just fine to keep write ordering. So
         * here we don't need to wait for node write completion, since we use
         * node chain which serializes node blocks. If one of node writes are
         * reordered, we can see simply broken chain, resulting in stopping
         * roll-forward recovery. It means we'll recover all or none node blocks
         * given fsync mark.
         */
        if (!atomic) {
                ret = f2fs_wait_on_node_pages_writeback(sbi, seq_id);
                if (ret)
                        goto out;
        }

        /* once recovery info is written, don't need to tack this */
        f2fs_remove_ino_entry(sbi, ino, APPEND_INO);
        clear_inode_flag(inode, FI_APPEND_WRITE);
flush_out:
        if ((!atomic && F2FS_OPTION(sbi).fsync_mode != FSYNC_MODE_NOBARRIER) ||
            (atomic && !test_opt(sbi, NOBARRIER) && f2fs_sb_has_blkzoned(sbi)))
                ret = f2fs_issue_flush(sbi, inode->i_ino);
        if (!ret) {
                f2fs_remove_ino_entry(sbi, ino, UPDATE_INO);
                clear_inode_flag(inode, FI_UPDATE_WRITE);
                f2fs_remove_ino_entry(sbi, ino, FLUSH_INO);
        }
        f2fs_update_time(sbi, REQ_TIME);
out:
        trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
        return ret;
}

int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
        if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(file)))))
                return -EIO;
        return f2fs_do_sync_file(file, start, end, datasync, false);
}

static bool __found_offset(struct address_space *mapping, block_t blkaddr,
                                pgoff_t index, int whence)
{
        switch (whence) {
        case SEEK_DATA:
                if (__is_valid_data_blkaddr(blkaddr))
                        return true;
                if (blkaddr == NEW_ADDR &&
                    xa_get_mark(&mapping->i_pages, index, PAGECACHE_TAG_DIRTY))
                        return true;
                break;
        case SEEK_HOLE:
                if (blkaddr == NULL_ADDR)
                        return true;
                break;
        }
        return false;
}

static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
{
        struct inode *inode = file->f_mapping->host;
        loff_t maxbytes = inode->i_sb->s_maxbytes;
        struct dnode_of_data dn;
        pgoff_t pgofs, end_offset;
        loff_t data_ofs = offset;
        loff_t isize;
        int err = 0;

        inode_lock(inode);

        isize = i_size_read(inode);
        if (offset >= isize)
                goto fail;

        /* handle inline data case */
        if (f2fs_has_inline_data(inode)) {
                if (whence == SEEK_HOLE) {
                        data_ofs = isize;
                        goto found;
                } else if (whence == SEEK_DATA) {
                        data_ofs = offset;
                        goto found;
                }
        }

        pgofs = (pgoff_t)(offset >> PAGE_SHIFT);

        for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
                set_new_dnode(&dn, inode, NULL, NULL, 0);
                err = f2fs_get_dnode_of_data(&dn, pgofs, LOOKUP_NODE);
                if (err && err != -ENOENT) {
                        goto fail;
                } else if (err == -ENOENT) {
                        /* direct node does not exists */
                        if (whence == SEEK_DATA) {
                                pgofs = f2fs_get_next_page_offset(&dn, pgofs);
                                continue;
                        } else {
                                goto found;
                        }
                }

                end_offset = ADDRS_PER_PAGE(dn.node_page, inode);

                /* find data/hole in dnode block */
                for (; dn.ofs_in_node < end_offset;
                                dn.ofs_in_node++, pgofs++,
                                data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
                        block_t blkaddr;

                        blkaddr = f2fs_data_blkaddr(&dn);

                        if (__is_valid_data_blkaddr(blkaddr) &&
                                !f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
                                        blkaddr, DATA_GENERIC_ENHANCE)) {
                                f2fs_put_dnode(&dn);
                                goto fail;
                        }

                        if (__found_offset(file->f_mapping, blkaddr,
                                                        pgofs, whence)) {
                                f2fs_put_dnode(&dn);
                                goto found;
                        }
                }
                f2fs_put_dnode(&dn);
        }

        if (whence == SEEK_DATA)
                goto fail;
found:
        if (whence == SEEK_HOLE && data_ofs > isize)
                data_ofs = isize;
        inode_unlock(inode);
        return vfs_setpos(file, data_ofs, maxbytes);
fail:
        inode_unlock(inode);
        return -ENXIO;
}

static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
{
        struct inode *inode = file->f_mapping->host;
        loff_t maxbytes = inode->i_sb->s_maxbytes;

        if (f2fs_compressed_file(inode))
                maxbytes = max_file_blocks(inode) << F2FS_BLKSIZE_BITS;

        switch (whence) {
        case SEEK_SET:
        case SEEK_CUR:
        case SEEK_END:
                return generic_file_llseek_size(file, offset, whence,
                                                maxbytes, i_size_read(inode));
        case SEEK_DATA:
        case SEEK_HOLE:
                if (offset < 0)
                        return -ENXIO;
                return f2fs_seek_block(file, offset, whence);
        }

        return -EINVAL;
}

static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
        struct inode *inode = file_inode(file);

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
                return -EIO;

        if (!f2fs_is_compress_backend_ready(inode))
                return -EOPNOTSUPP;

        file_accessed(file);
        vma->vm_ops = &f2fs_file_vm_ops;
        set_inode_flag(inode, FI_MMAP_FILE);
        return 0;
}

static int f2fs_file_open(struct inode *inode, struct file *filp)
{
        int err = fscrypt_file_open(inode, filp);

        if (err)
                return err;

        if (!f2fs_is_compress_backend_ready(inode))
                return -EOPNOTSUPP;

        err = fsverity_file_open(inode, filp);
        if (err)
                return err;

        filp->f_mode |= FMODE_NOWAIT;

        return dquot_file_open(inode, filp);
}

void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
        struct f2fs_node *raw_node;
        int nr_free = 0, ofs = dn->ofs_in_node, len = count;
        __le32 *addr;
        int base = 0;
        bool compressed_cluster = false;
        int cluster_index = 0, valid_blocks = 0;
        int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
        bool released = !atomic_read(&F2FS_I(dn->inode)->i_compr_blocks);

        if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
                base = get_extra_isize(dn->inode);

        raw_node = F2FS_NODE(dn->node_page);
        addr = blkaddr_in_node(raw_node) + base + ofs;

        /* Assumption: truncation starts with cluster */
        for (; count > 0; count--, addr++, dn->ofs_in_node++, cluster_index++) {
                block_t blkaddr = le32_to_cpu(*addr);

                if (f2fs_compressed_file(dn->inode) &&
                                        !(cluster_index & (cluster_size - 1))) {
                        if (compressed_cluster)
                                f2fs_i_compr_blocks_update(dn->inode,
                                                        valid_blocks, false);
                        compressed_cluster = (blkaddr == COMPRESS_ADDR);
                        valid_blocks = 0;
                }

                if (blkaddr == NULL_ADDR)
                        continue;

                dn->data_blkaddr = NULL_ADDR;
                f2fs_set_data_blkaddr(dn);

                if (__is_valid_data_blkaddr(blkaddr)) {
                        if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
                                        DATA_GENERIC_ENHANCE))
                                continue;
                        if (compressed_cluster)
                                valid_blocks++;
                }

                if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
                        clear_inode_flag(dn->inode, FI_FIRST_BLOCK_WRITTEN);

                f2fs_invalidate_blocks(sbi, blkaddr);

                if (!released || blkaddr != COMPRESS_ADDR)
                        nr_free++;
        }

        if (compressed_cluster)
                f2fs_i_compr_blocks_update(dn->inode, valid_blocks, false);

        if (nr_free) {
                pgoff_t fofs;
                /*
                 * once we invalidate valid blkaddr in range [ofs, ofs + count],
                 * we will invalidate all blkaddr in the whole range.
                 */
                fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page),
                                                        dn->inode) + ofs;
                f2fs_update_read_extent_cache_range(dn, fofs, 0, len);
                f2fs_update_age_extent_cache_range(dn, fofs, nr_free);
                dec_valid_block_count(sbi, dn->inode, nr_free);
        }
        dn->ofs_in_node = ofs;

        f2fs_update_time(sbi, REQ_TIME);
        trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
                                         dn->ofs_in_node, nr_free);
}

void f2fs_truncate_data_blocks(struct dnode_of_data *dn)
{
        f2fs_truncate_data_blocks_range(dn, ADDRS_PER_BLOCK(dn->inode));
}

static int truncate_partial_data_page(struct inode *inode, u64 from,
                                                                bool cache_only)
{
        loff_t offset = from & (PAGE_SIZE - 1);
        pgoff_t index = from >> PAGE_SHIFT;
        struct address_space *mapping = inode->i_mapping;
        struct page *page;

        if (!offset && !cache_only)
                return 0;

        if (cache_only) {
                page = find_lock_page(mapping, index);
                if (page && PageUptodate(page))
                        goto truncate_out;
                f2fs_put_page(page, 1);
                return 0;
        }

        page = f2fs_get_lock_data_page(inode, index, true);
        if (IS_ERR(page))
                return PTR_ERR(page) == -ENOENT ? 0 : PTR_ERR(page);
truncate_out:
        f2fs_wait_on_page_writeback(page, DATA, true, true);
        zero_user(page, offset, PAGE_SIZE - offset);

        /* An encrypted inode should have a key and truncate the last page. */
        f2fs_bug_on(F2FS_I_SB(inode), cache_only && IS_ENCRYPTED(inode));
        if (!cache_only)
                set_page_dirty(page);
        f2fs_put_page(page, 1);
        return 0;
}

int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct dnode_of_data dn;
        pgoff_t free_from;
        int count = 0, err = 0;
        struct page *ipage;
        bool truncate_page = false;

        trace_f2fs_truncate_blocks_enter(inode, from);

        free_from = (pgoff_t)F2FS_BLK_ALIGN(from);

        if (free_from >= max_file_blocks(inode))
                goto free_partial;

        if (lock)
                f2fs_lock_op(sbi);

        ipage = f2fs_get_node_page(sbi, inode->i_ino);
        if (IS_ERR(ipage)) {
                err = PTR_ERR(ipage);
                goto out;
        }

        if (f2fs_has_inline_data(inode)) {
                f2fs_truncate_inline_inode(inode, ipage, from);
                f2fs_put_page(ipage, 1);
                truncate_page = true;
                goto out;
        }

        set_new_dnode(&dn, inode, ipage, NULL, 0);
        err = f2fs_get_dnode_of_data(&dn, free_from, LOOKUP_NODE_RA);
        if (err) {
                if (err == -ENOENT)
                        goto free_next;
                goto out;
        }

        count = ADDRS_PER_PAGE(dn.node_page, inode);

        count -= dn.ofs_in_node;
        f2fs_bug_on(sbi, count < 0);

        if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
                f2fs_truncate_data_blocks_range(&dn, count);
                free_from += count;
        }

        f2fs_put_dnode(&dn);
free_next:
        err = f2fs_truncate_inode_blocks(inode, free_from);
out:
        if (lock)
                f2fs_unlock_op(sbi);
free_partial:
        /* lastly zero out the first data page */
        if (!err)
                err = truncate_partial_data_page(inode, from, truncate_page);

        trace_f2fs_truncate_blocks_exit(inode, err);
        return err;
}

int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
{
        u64 free_from = from;
        int err;

#ifdef CONFIG_F2FS_FS_COMPRESSION
        /*
         * for compressed file, only support cluster size
         * aligned truncation.
         */
        if (f2fs_compressed_file(inode))
                free_from = round_up(from,
                                F2FS_I(inode)->i_cluster_size << PAGE_SHIFT);
#endif

        err = f2fs_do_truncate_blocks(inode, free_from, lock);
        if (err)
                return err;

#ifdef CONFIG_F2FS_FS_COMPRESSION
        /*
         * For compressed file, after release compress blocks, don't allow write
         * direct, but we should allow write direct after truncate to zero.
         */
        if (f2fs_compressed_file(inode) && !free_from
                        && is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
                clear_inode_flag(inode, FI_COMPRESS_RELEASED);

        if (from != free_from) {
                err = f2fs_truncate_partial_cluster(inode, from, lock);
                if (err)
                        return err;
        }
#endif

        return 0;
}

int f2fs_truncate(struct inode *inode)
{
        int err;

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
                return -EIO;

        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
                                S_ISLNK(inode->i_mode)))
                return 0;

        trace_f2fs_truncate(inode);

        if (time_to_inject(F2FS_I_SB(inode), FAULT_TRUNCATE)) {
                f2fs_show_injection_info(F2FS_I_SB(inode), FAULT_TRUNCATE);
                return -EIO;
        }

        err = f2fs_dquot_initialize(inode);
        if (err)
                return err;

        /* we should check inline_data size */
        if (!f2fs_may_inline_data(inode)) {
                err = f2fs_convert_inline_inode(inode);
                if (err)
                        return err;
        }

        err = f2fs_truncate_blocks(inode, i_size_read(inode), true);
        if (err)
                return err;

        inode->i_mtime = inode->i_ctime = current_time(inode);
        f2fs_mark_inode_dirty_sync(inode, false);
        return 0;
}

static bool f2fs_force_buffered_io(struct inode *inode, int rw)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

        if (!fscrypt_dio_supported(inode))
                return true;
        if (fsverity_active(inode))
                return true;
        if (f2fs_compressed_file(inode))
                return true;

        /* disallow direct IO if any of devices has unaligned blksize */
        if (f2fs_is_multi_device(sbi) && !sbi->aligned_blksize)
                return true;
        /*
         * for blkzoned device, fallback direct IO to buffered IO, so
         * all IOs can be serialized by log-structured write.
         */
        if (f2fs_sb_has_blkzoned(sbi) && (rw == WRITE))
                return true;
        if (f2fs_lfs_mode(sbi) && rw == WRITE && F2FS_IO_ALIGNED(sbi))
                return true;
        if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
                return true;

        return false;
}

int f2fs_getattr(struct mnt_idmap *idmap, const struct path *path,
                 struct kstat *stat, u32 request_mask, unsigned int query_flags)
{
        struct inode *inode = d_inode(path->dentry);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_inode *ri = NULL;
        unsigned int flags;

        if (f2fs_has_extra_attr(inode) &&
                        f2fs_sb_has_inode_crtime(F2FS_I_SB(inode)) &&
                        F2FS_FITS_IN_INODE(ri, fi->i_extra_isize, i_crtime)) {
                stat->result_mask |= STATX_BTIME;
                stat->btime.tv_sec = fi->i_crtime.tv_sec;
                stat->btime.tv_nsec = fi->i_crtime.tv_nsec;
        }

        /*
         * Return the DIO alignment restrictions if requested.  We only return
         * this information when requested, since on encrypted files it might
         * take a fair bit of work to get if the file wasn't opened recently.
         *
         * f2fs sometimes supports DIO reads but not DIO writes.  STATX_DIOALIGN
         * cannot represent that, so in that case we report no DIO support.
         */
        if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
                unsigned int bsize = i_blocksize(inode);

                stat->result_mask |= STATX_DIOALIGN;
                if (!f2fs_force_buffered_io(inode, WRITE)) {
                        stat->dio_mem_align = bsize;
                        stat->dio_offset_align = bsize;
                }
        }

        flags = fi->i_flags;
        if (flags & F2FS_COMPR_FL)
                stat->attributes |= STATX_ATTR_COMPRESSED;
        if (flags & F2FS_APPEND_FL)
                stat->attributes |= STATX_ATTR_APPEND;
        if (IS_ENCRYPTED(inode))
                stat->attributes |= STATX_ATTR_ENCRYPTED;
        if (flags & F2FS_IMMUTABLE_FL)
                stat->attributes |= STATX_ATTR_IMMUTABLE;
        if (flags & F2FS_NODUMP_FL)
                stat->attributes |= STATX_ATTR_NODUMP;
        if (IS_VERITY(inode))
                stat->attributes |= STATX_ATTR_VERITY;

        stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
                                  STATX_ATTR_APPEND |
                                  STATX_ATTR_ENCRYPTED |
                                  STATX_ATTR_IMMUTABLE |
                                  STATX_ATTR_NODUMP |
                                  STATX_ATTR_VERITY);

        generic_fillattr(idmap, inode, stat);

        /* we need to show initial sectors used for inline_data/dentries */
        if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
                                        f2fs_has_inline_dentry(inode))
                stat->blocks += (stat->size + 511) >> 9;

        return 0;
}

#ifdef CONFIG_F2FS_FS_POSIX_ACL
static void __setattr_copy(struct mnt_idmap *idmap,
                           struct inode *inode, const struct iattr *attr)
{
        unsigned int ia_valid = attr->ia_valid;
        struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);

        i_uid_update(mnt_userns, attr, inode);
        i_gid_update(mnt_userns, attr, inode);
        if (ia_valid & ATTR_ATIME)
                inode->i_atime = attr->ia_atime;
        if (ia_valid & ATTR_MTIME)
                inode->i_mtime = attr->ia_mtime;
        if (ia_valid & ATTR_CTIME)
                inode->i_ctime = attr->ia_ctime;
        if (ia_valid & ATTR_MODE) {
                umode_t mode = attr->ia_mode;
                vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode);

                if (!vfsgid_in_group_p(vfsgid) &&
                    !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
                        mode &= ~S_ISGID;
                set_acl_inode(inode, mode);
        }
}
#else
#define __setattr_copy setattr_copy
#endif

int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
                 struct iattr *attr)
{
        struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
        struct inode *inode = d_inode(dentry);
        int err;

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
                return -EIO;

        if (unlikely(IS_IMMUTABLE(inode)))
                return -EPERM;

        if (unlikely(IS_APPEND(inode) &&
                        (attr->ia_valid & (ATTR_MODE | ATTR_UID |
                                  ATTR_GID | ATTR_TIMES_SET))))
                return -EPERM;

        if ((attr->ia_valid & ATTR_SIZE) &&
                !f2fs_is_compress_backend_ready(inode))
                return -EOPNOTSUPP;

        err = setattr_prepare(idmap, dentry, attr);
        if (err)
                return err;

        err = fscrypt_prepare_setattr(dentry, attr);
        if (err)
                return err;

        err = fsverity_prepare_setattr(dentry, attr);
        if (err)
                return err;

        if (is_quota_modification(idmap, inode, attr)) {
                err = f2fs_dquot_initialize(inode);
                if (err)
                        return err;
        }
        if (i_uid_needs_update(mnt_userns, attr, inode) ||
            i_gid_needs_update(mnt_userns, attr, inode)) {
                f2fs_lock_op(F2FS_I_SB(inode));
                err = dquot_transfer(idmap, inode, attr);
                if (err) {
                        set_sbi_flag(F2FS_I_SB(inode),
                                        SBI_QUOTA_NEED_REPAIR);
                        f2fs_unlock_op(F2FS_I_SB(inode));
                        return err;
                }
                /*
                 * update uid/gid under lock_op(), so that dquot and inode can
                 * be updated atomically.
                 */
                i_uid_update(mnt_userns, attr, inode);
                i_gid_update(mnt_userns, attr, inode);
                f2fs_mark_inode_dirty_sync(inode, true);
                f2fs_unlock_op(F2FS_I_SB(inode));
        }

        if (attr->ia_valid & ATTR_SIZE) {
                loff_t old_size = i_size_read(inode);

                if (attr->ia_size > MAX_INLINE_DATA(inode)) {
                        /*
                         * should convert inline inode before i_size_write to
                         * keep smaller than inline_data size with inline flag.
                         */
                        err = f2fs_convert_inline_inode(inode);
                        if (err)
                                return err;
                }

                f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                filemap_invalidate_lock(inode->i_mapping);

                truncate_setsize(inode, attr->ia_size);

                if (attr->ia_size <= old_size)
                        err = f2fs_truncate(inode);
                /*
                 * do not trim all blocks after i_size if target size is
                 * larger than i_size.
                 */
                filemap_invalidate_unlock(inode->i_mapping);
                f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                if (err)
                        return err;

                spin_lock(&F2FS_I(inode)->i_size_lock);
                inode->i_mtime = inode->i_ctime = current_time(inode);
                F2FS_I(inode)->last_disk_size = i_size_read(inode);
                spin_unlock(&F2FS_I(inode)->i_size_lock);
        }

        __setattr_copy(idmap, inode, attr);

        if (attr->ia_valid & ATTR_MODE) {
                err = posix_acl_chmod(idmap, dentry, f2fs_get_inode_mode(inode));

                if (is_inode_flag_set(inode, FI_ACL_MODE)) {
                        if (!err)
                                inode->i_mode = F2FS_I(inode)->i_acl_mode;
                        clear_inode_flag(inode, FI_ACL_MODE);
                }
        }

        /* file size may changed here */
        f2fs_mark_inode_dirty_sync(inode, true);

        /* inode change will produce dirty node pages flushed by checkpoint */
        f2fs_balance_fs(F2FS_I_SB(inode), true);

        return err;
}

const struct inode_operations f2fs_file_inode_operations = {
        .getattr        = f2fs_getattr,
        .setattr        = f2fs_setattr,
        .get_inode_acl  = f2fs_get_acl,
        .set_acl        = f2fs_set_acl,
        .listxattr      = f2fs_listxattr,
        .fiemap         = f2fs_fiemap,
        .fileattr_get   = f2fs_fileattr_get,
        .fileattr_set   = f2fs_fileattr_set,
};

static int fill_zero(struct inode *inode, pgoff_t index,
                                        loff_t start, loff_t len)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct page *page;

        if (!len)
                return 0;

        f2fs_balance_fs(sbi, true);

        f2fs_lock_op(sbi);
        page = f2fs_get_new_data_page(inode, NULL, index, false);
        f2fs_unlock_op(sbi);

        if (IS_ERR(page))
                return PTR_ERR(page);

        f2fs_wait_on_page_writeback(page, DATA, true, true);
        zero_user(page, start, len);
        set_page_dirty(page);
        f2fs_put_page(page, 1);
        return 0;
}

int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
{
        int err;

        while (pg_start < pg_end) {
                struct dnode_of_data dn;
                pgoff_t end_offset, count;

                set_new_dnode(&dn, inode, NULL, NULL, 0);
                err = f2fs_get_dnode_of_data(&dn, pg_start, LOOKUP_NODE);
                if (err) {
                        if (err == -ENOENT) {
                                pg_start = f2fs_get_next_page_offset(&dn,
                                                                pg_start);
                                continue;
                        }
                        return err;
                }

                end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
                count = min(end_offset - dn.ofs_in_node, pg_end - pg_start);

                f2fs_bug_on(F2FS_I_SB(inode), count == 0 || count > end_offset);

                f2fs_truncate_data_blocks_range(&dn, count);
                f2fs_put_dnode(&dn);

                pg_start += count;
        }
        return 0;
}

static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
{
        pgoff_t pg_start, pg_end;
        loff_t off_start, off_end;
        int ret;

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                return ret;

        pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
        pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;

        off_start = offset & (PAGE_SIZE - 1);
        off_end = (offset + len) & (PAGE_SIZE - 1);

        if (pg_start == pg_end) {
                ret = fill_zero(inode, pg_start, off_start,
                                                off_end - off_start);
                if (ret)
                        return ret;
        } else {
                if (off_start) {
                        ret = fill_zero(inode, pg_start++, off_start,
                                                PAGE_SIZE - off_start);
                        if (ret)
                                return ret;
                }
                if (off_end) {
                        ret = fill_zero(inode, pg_end, 0, off_end);
                        if (ret)
                                return ret;
                }

                if (pg_start < pg_end) {
                        loff_t blk_start, blk_end;
                        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

                        f2fs_balance_fs(sbi, true);

                        blk_start = (loff_t)pg_start << PAGE_SHIFT;
                        blk_end = (loff_t)pg_end << PAGE_SHIFT;

                        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                        filemap_invalidate_lock(inode->i_mapping);

                        truncate_pagecache_range(inode, blk_start, blk_end - 1);

                        f2fs_lock_op(sbi);
                        ret = f2fs_truncate_hole(inode, pg_start, pg_end);
                        f2fs_unlock_op(sbi);

                        filemap_invalidate_unlock(inode->i_mapping);
                        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                }
        }

        return ret;
}

static int __read_out_blkaddrs(struct inode *inode, block_t *blkaddr,
                                int *do_replace, pgoff_t off, pgoff_t len)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct dnode_of_data dn;
        int ret, done, i;

next_dnode:
        set_new_dnode(&dn, inode, NULL, NULL, 0);
        ret = f2fs_get_dnode_of_data(&dn, off, LOOKUP_NODE_RA);
        if (ret && ret != -ENOENT) {
                return ret;
        } else if (ret == -ENOENT) {
                if (dn.max_level == 0)
                        return -ENOENT;
                done = min((pgoff_t)ADDRS_PER_BLOCK(inode) -
                                                dn.ofs_in_node, len);
                blkaddr += done;
                do_replace += done;
                goto next;
        }

        done = min((pgoff_t)ADDRS_PER_PAGE(dn.node_page, inode) -
                                                        dn.ofs_in_node, len);
        for (i = 0; i < done; i++, blkaddr++, do_replace++, dn.ofs_in_node++) {
                *blkaddr = f2fs_data_blkaddr(&dn);

                if (__is_valid_data_blkaddr(*blkaddr) &&
                        !f2fs_is_valid_blkaddr(sbi, *blkaddr,
                                        DATA_GENERIC_ENHANCE)) {
                        f2fs_put_dnode(&dn);
                        f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
                        return -EFSCORRUPTED;
                }

                if (!f2fs_is_checkpointed_data(sbi, *blkaddr)) {

                        if (f2fs_lfs_mode(sbi)) {
                                f2fs_put_dnode(&dn);
                                return -EOPNOTSUPP;
                        }

                        /* do not invalidate this block address */
                        f2fs_update_data_blkaddr(&dn, NULL_ADDR);
                        *do_replace = 1;
                }
        }
        f2fs_put_dnode(&dn);
next:
        len -= done;
        off += done;
        if (len)
                goto next_dnode;
        return 0;
}

static int __roll_back_blkaddrs(struct inode *inode, block_t *blkaddr,
                                int *do_replace, pgoff_t off, int len)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct dnode_of_data dn;
        int ret, i;

        for (i = 0; i < len; i++, do_replace++, blkaddr++) {
                if (*do_replace == 0)
                        continue;

                set_new_dnode(&dn, inode, NULL, NULL, 0);
                ret = f2fs_get_dnode_of_data(&dn, off + i, LOOKUP_NODE_RA);
                if (ret) {
                        dec_valid_block_count(sbi, inode, 1);
                        f2fs_invalidate_blocks(sbi, *blkaddr);
                } else {
                        f2fs_update_data_blkaddr(&dn, *blkaddr);
                }
                f2fs_put_dnode(&dn);
        }
        return 0;
}

static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode,
                        block_t *blkaddr, int *do_replace,
                        pgoff_t src, pgoff_t dst, pgoff_t len, bool full)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(src_inode);
        pgoff_t i = 0;
        int ret;

        while (i < len) {
                if (blkaddr[i] == NULL_ADDR && !full) {
                        i++;
                        continue;
                }

                if (do_replace[i] || blkaddr[i] == NULL_ADDR) {
                        struct dnode_of_data dn;
                        struct node_info ni;
                        size_t new_size;
                        pgoff_t ilen;

                        set_new_dnode(&dn, dst_inode, NULL, NULL, 0);
                        ret = f2fs_get_dnode_of_data(&dn, dst + i, ALLOC_NODE);
                        if (ret)
                                return ret;

                        ret = f2fs_get_node_info(sbi, dn.nid, &ni, false);
                        if (ret) {
                                f2fs_put_dnode(&dn);
                                return ret;
                        }

                        ilen = min((pgoff_t)
                                ADDRS_PER_PAGE(dn.node_page, dst_inode) -
                                                dn.ofs_in_node, len - i);
                        do {
                                dn.data_blkaddr = f2fs_data_blkaddr(&dn);
                                f2fs_truncate_data_blocks_range(&dn, 1);

                                if (do_replace[i]) {
                                        f2fs_i_blocks_write(src_inode,
                                                        1, false, false);
                                        f2fs_i_blocks_write(dst_inode,
                                                        1, true, false);
                                        f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
                                        blkaddr[i], ni.version, true, false);

                                        do_replace[i] = 0;
                                }
                                dn.ofs_in_node++;
                                i++;
                                new_size = (loff_t)(dst + i) << PAGE_SHIFT;
                                if (dst_inode->i_size < new_size)
                                        f2fs_i_size_write(dst_inode, new_size);
                        } while (--ilen && (do_replace[i] || blkaddr[i] == NULL_ADDR));

                        f2fs_put_dnode(&dn);
                } else {
                        struct page *psrc, *pdst;

                        psrc = f2fs_get_lock_data_page(src_inode,
                                                        src + i, true);
                        if (IS_ERR(psrc))
                                return PTR_ERR(psrc);
                        pdst = f2fs_get_new_data_page(dst_inode, NULL, dst + i,
                                                                true);
                        if (IS_ERR(pdst)) {
                                f2fs_put_page(psrc, 1);
                                return PTR_ERR(pdst);
                        }
                        memcpy_page(pdst, 0, psrc, 0, PAGE_SIZE);
                        set_page_dirty(pdst);
                        f2fs_put_page(pdst, 1);
                        f2fs_put_page(psrc, 1);

                        ret = f2fs_truncate_hole(src_inode,
                                                src + i, src + i + 1);
                        if (ret)
                                return ret;
                        i++;
                }
        }
        return 0;
}

static int __exchange_data_block(struct inode *src_inode,
                        struct inode *dst_inode, pgoff_t src, pgoff_t dst,
                        pgoff_t len, bool full)
{
        block_t *src_blkaddr;
        int *do_replace;
        pgoff_t olen;
        int ret;

        while (len) {
                olen = min((pgoff_t)4 * ADDRS_PER_BLOCK(src_inode), len);

                src_blkaddr = f2fs_kvzalloc(F2FS_I_SB(src_inode),
                                        array_size(olen, sizeof(block_t)),
                                        GFP_NOFS);
                if (!src_blkaddr)
                        return -ENOMEM;

                do_replace = f2fs_kvzalloc(F2FS_I_SB(src_inode),
                                        array_size(olen, sizeof(int)),
                                        GFP_NOFS);
                if (!do_replace) {
                        kvfree(src_blkaddr);
                        return -ENOMEM;
                }

                ret = __read_out_blkaddrs(src_inode, src_blkaddr,
                                        do_replace, src, olen);
                if (ret)
                        goto roll_back;

                ret = __clone_blkaddrs(src_inode, dst_inode, src_blkaddr,
                                        do_replace, src, dst, olen, full);
                if (ret)
                        goto roll_back;

                src += olen;
                dst += olen;
                len -= olen;

                kvfree(src_blkaddr);
                kvfree(do_replace);
        }
        return 0;

roll_back:
        __roll_back_blkaddrs(src_inode, src_blkaddr, do_replace, src, olen);
        kvfree(src_blkaddr);
        kvfree(do_replace);
        return ret;
}

static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        pgoff_t nrpages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
        pgoff_t start = offset >> PAGE_SHIFT;
        pgoff_t end = (offset + len) >> PAGE_SHIFT;
        int ret;

        f2fs_balance_fs(sbi, true);

        /* avoid gc operation during block exchange */
        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        filemap_invalidate_lock(inode->i_mapping);

        f2fs_lock_op(sbi);
        f2fs_drop_extent_tree(inode);
        truncate_pagecache(inode, offset);
        ret = __exchange_data_block(inode, inode, end, start, nrpages - end, true);
        f2fs_unlock_op(sbi);

        filemap_invalidate_unlock(inode->i_mapping);
        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        return ret;
}

static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
{
        loff_t new_size;
        int ret;

        if (offset + len >= i_size_read(inode))
                return -EINVAL;

        /* collapse range should be aligned to block size of f2fs. */
        if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
                return -EINVAL;

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                return ret;

        /* write out all dirty pages from offset */
        ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
        if (ret)
                return ret;

        ret = f2fs_do_collapse(inode, offset, len);
        if (ret)
                return ret;

        /* write out all moved pages, if possible */
        filemap_invalidate_lock(inode->i_mapping);
        filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
        truncate_pagecache(inode, offset);

        new_size = i_size_read(inode) - len;
        ret = f2fs_truncate_blocks(inode, new_size, true);
        filemap_invalidate_unlock(inode->i_mapping);
        if (!ret)
                f2fs_i_size_write(inode, new_size);
        return ret;
}

static int f2fs_do_zero_range(struct dnode_of_data *dn, pgoff_t start,
                                                                pgoff_t end)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
        pgoff_t index = start;
        unsigned int ofs_in_node = dn->ofs_in_node;
        blkcnt_t count = 0;
        int ret;

        for (; index < end; index++, dn->ofs_in_node++) {
                if (f2fs_data_blkaddr(dn) == NULL_ADDR)
                        count++;
        }

        dn->ofs_in_node = ofs_in_node;
        ret = f2fs_reserve_new_blocks(dn, count);
        if (ret)
                return ret;

        dn->ofs_in_node = ofs_in_node;
        for (index = start; index < end; index++, dn->ofs_in_node++) {
                dn->data_blkaddr = f2fs_data_blkaddr(dn);
                /*
                 * f2fs_reserve_new_blocks will not guarantee entire block
                 * allocation.
                 */
                if (dn->data_blkaddr == NULL_ADDR) {
                        ret = -ENOSPC;
                        break;
                }

                if (dn->data_blkaddr == NEW_ADDR)
                        continue;

                if (!f2fs_is_valid_blkaddr(sbi, dn->data_blkaddr,
                                        DATA_GENERIC_ENHANCE)) {
                        ret = -EFSCORRUPTED;
                        f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
                        break;
                }

                f2fs_invalidate_blocks(sbi, dn->data_blkaddr);
                dn->data_blkaddr = NEW_ADDR;
                f2fs_set_data_blkaddr(dn);
        }

        f2fs_update_read_extent_cache_range(dn, start, 0, index - start);

        return ret;
}

static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
                                                                int mode)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct address_space *mapping = inode->i_mapping;
        pgoff_t index, pg_start, pg_end;
        loff_t new_size = i_size_read(inode);
        loff_t off_start, off_end;
        int ret = 0;

        ret = inode_newsize_ok(inode, (len + offset));
        if (ret)
                return ret;

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                return ret;

        ret = filemap_write_and_wait_range(mapping, offset, offset + len - 1);
        if (ret)
                return ret;

        pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
        pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;

        off_start = offset & (PAGE_SIZE - 1);
        off_end = (offset + len) & (PAGE_SIZE - 1);

        if (pg_start == pg_end) {
                ret = fill_zero(inode, pg_start, off_start,
                                                off_end - off_start);
                if (ret)
                        return ret;

                new_size = max_t(loff_t, new_size, offset + len);
        } else {
                if (off_start) {
                        ret = fill_zero(inode, pg_start++, off_start,
                                                PAGE_SIZE - off_start);
                        if (ret)
                                return ret;

                        new_size = max_t(loff_t, new_size,
                                        (loff_t)pg_start << PAGE_SHIFT);
                }

                for (index = pg_start; index < pg_end;) {
                        struct dnode_of_data dn;
                        unsigned int end_offset;
                        pgoff_t end;

                        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                        filemap_invalidate_lock(mapping);

                        truncate_pagecache_range(inode,
                                (loff_t)index << PAGE_SHIFT,
                                ((loff_t)pg_end << PAGE_SHIFT) - 1);

                        f2fs_lock_op(sbi);

                        set_new_dnode(&dn, inode, NULL, NULL, 0);
                        ret = f2fs_get_dnode_of_data(&dn, index, ALLOC_NODE);
                        if (ret) {
                                f2fs_unlock_op(sbi);
                                filemap_invalidate_unlock(mapping);
                                f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                                goto out;
                        }

                        end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
                        end = min(pg_end, end_offset - dn.ofs_in_node + index);

                        ret = f2fs_do_zero_range(&dn, index, end);
                        f2fs_put_dnode(&dn);

                        f2fs_unlock_op(sbi);
                        filemap_invalidate_unlock(mapping);
                        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);

                        f2fs_balance_fs(sbi, dn.node_changed);

                        if (ret)
                                goto out;

                        index = end;
                        new_size = max_t(loff_t, new_size,
                                        (loff_t)index << PAGE_SHIFT);
                }

                if (off_end) {
                        ret = fill_zero(inode, pg_end, 0, off_end);
                        if (ret)
                                goto out;

                        new_size = max_t(loff_t, new_size, offset + len);
                }
        }

out:
        if (new_size > i_size_read(inode)) {
                if (mode & FALLOC_FL_KEEP_SIZE)
                        file_set_keep_isize(inode);
                else
                        f2fs_i_size_write(inode, new_size);
        }
        return ret;
}

static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct address_space *mapping = inode->i_mapping;
        pgoff_t nr, pg_start, pg_end, delta, idx;
        loff_t new_size;
        int ret = 0;

        new_size = i_size_read(inode) + len;
        ret = inode_newsize_ok(inode, new_size);
        if (ret)
                return ret;

        if (offset >= i_size_read(inode))
                return -EINVAL;

        /* insert range should be aligned to block size of f2fs. */
        if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
                return -EINVAL;

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                return ret;

        f2fs_balance_fs(sbi, true);

        filemap_invalidate_lock(mapping);
        ret = f2fs_truncate_blocks(inode, i_size_read(inode), true);
        filemap_invalidate_unlock(mapping);
        if (ret)
                return ret;

        /* write out all dirty pages from offset */
        ret = filemap_write_and_wait_range(mapping, offset, LLONG_MAX);
        if (ret)
                return ret;

        pg_start = offset >> PAGE_SHIFT;
        pg_end = (offset + len) >> PAGE_SHIFT;
        delta = pg_end - pg_start;
        idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);

        /* avoid gc operation during block exchange */
        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        filemap_invalidate_lock(mapping);
        truncate_pagecache(inode, offset);

        while (!ret && idx > pg_start) {
                nr = idx - pg_start;
                if (nr > delta)
                        nr = delta;
                idx -= nr;

                f2fs_lock_op(sbi);
                f2fs_drop_extent_tree(inode);

                ret = __exchange_data_block(inode, inode, idx,
                                        idx + delta, nr, false);
                f2fs_unlock_op(sbi);
        }
        filemap_invalidate_unlock(mapping);
        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);

        /* write out all moved pages, if possible */
        filemap_invalidate_lock(mapping);
        filemap_write_and_wait_range(mapping, offset, LLONG_MAX);
        truncate_pagecache(inode, offset);
        filemap_invalidate_unlock(mapping);

        if (!ret)
                f2fs_i_size_write(inode, new_size);
        return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
                                        loff_t len, int mode)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_map_blocks map = { .m_next_pgofs = NULL,
                        .m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE,
                        .m_may_create = true };
        struct f2fs_gc_control gc_control = { .victim_segno = NULL_SEGNO,
                        .init_gc_type = FG_GC,
                        .should_migrate_blocks = false,
                        .err_gc_skipped = true,
                        .nr_free_secs = 0 };
        pgoff_t pg_start, pg_end;
        loff_t new_size = i_size_read(inode);
        loff_t off_end;
        block_t expanded = 0;
        int err;

        err = inode_newsize_ok(inode, (len + offset));
        if (err)
                return err;

        err = f2fs_convert_inline_inode(inode);
        if (err)
                return err;

        f2fs_balance_fs(sbi, true);

        pg_start = ((unsigned long long)offset) >> PAGE_SHIFT;
        pg_end = ((unsigned long long)offset + len) >> PAGE_SHIFT;
        off_end = (offset + len) & (PAGE_SIZE - 1);

        map.m_lblk = pg_start;
        map.m_len = pg_end - pg_start;
        if (off_end)
                map.m_len++;

        if (!map.m_len)
                return 0;

        if (f2fs_is_pinned_file(inode)) {
                block_t sec_blks = CAP_BLKS_PER_SEC(sbi);
                block_t sec_len = roundup(map.m_len, sec_blks);

                map.m_len = sec_blks;
next_alloc:
                if (has_not_enough_free_secs(sbi, 0,
                        GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
                        f2fs_down_write(&sbi->gc_lock);
                        err = f2fs_gc(sbi, &gc_control);
                        if (err && err != -ENODATA)
                                goto out_err;
                }

                f2fs_down_write(&sbi->pin_sem);

                f2fs_lock_op(sbi);
                f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED, false);
                f2fs_unlock_op(sbi);

                map.m_seg_type = CURSEG_COLD_DATA_PINNED;
                err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
                file_dont_truncate(inode);

                f2fs_up_write(&sbi->pin_sem);

                expanded += map.m_len;
                sec_len -= map.m_len;
                map.m_lblk += map.m_len;
                if (!err && sec_len)
                        goto next_alloc;

                map.m_len = expanded;
        } else {
                err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
                expanded = map.m_len;
        }
out_err:
        if (err) {
                pgoff_t last_off;

                if (!expanded)
                        return err;

                last_off = pg_start + expanded - 1;

                /* update new size to the failed position */
                new_size = (last_off == pg_end) ? offset + len :
                                        (loff_t)(last_off + 1) << PAGE_SHIFT;
        } else {
                new_size = ((loff_t)pg_end << PAGE_SHIFT) + off_end;
        }

        if (new_size > i_size_read(inode)) {
                if (mode & FALLOC_FL_KEEP_SIZE)
                        file_set_keep_isize(inode);
                else
                        f2fs_i_size_write(inode, new_size);
        }

        return err;
}

static long f2fs_fallocate(struct file *file, int mode,
                                loff_t offset, loff_t len)
{
        struct inode *inode = file_inode(file);
        long ret = 0;

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
                return -EIO;
        if (!f2fs_is_checkpoint_ready(F2FS_I_SB(inode)))
                return -ENOSPC;
        if (!f2fs_is_compress_backend_ready(inode))
                return -EOPNOTSUPP;

        /* f2fs only support ->fallocate for regular file */
        if (!S_ISREG(inode->i_mode))
                return -EINVAL;

        if (IS_ENCRYPTED(inode) &&
                (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
                return -EOPNOTSUPP;

        /*
         * Pinned file should not support partial trucation since the block
         * can be used by applications.
         */
        if ((f2fs_compressed_file(inode) || f2fs_is_pinned_file(inode)) &&
                (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
                        FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE)))
                return -EOPNOTSUPP;

        if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
                        FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
                        FALLOC_FL_INSERT_RANGE))
                return -EOPNOTSUPP;

        inode_lock(inode);

        ret = file_modified(file);
        if (ret)
                goto out;

        if (mode & FALLOC_FL_PUNCH_HOLE) {
                if (offset >= inode->i_size)
                        goto out;

                ret = punch_hole(inode, offset, len);
        } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
                ret = f2fs_collapse_range(inode, offset, len);
        } else if (mode & FALLOC_FL_ZERO_RANGE) {
                ret = f2fs_zero_range(inode, offset, len, mode);
        } else if (mode & FALLOC_FL_INSERT_RANGE) {
                ret = f2fs_insert_range(inode, offset, len);
        } else {
                ret = expand_inode_data(inode, offset, len, mode);
        }

        if (!ret) {
                inode->i_mtime = inode->i_ctime = current_time(inode);
                f2fs_mark_inode_dirty_sync(inode, false);
                f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
        }

out:
        inode_unlock(inode);

        trace_f2fs_fallocate(inode, mode, offset, len, ret);
        return ret;
}

static int f2fs_release_file(struct inode *inode, struct file *filp)
{
        /*
         * f2fs_relase_file is called at every close calls. So we should
         * not drop any inmemory pages by close called by other process.
         */
        if (!(filp->f_mode & FMODE_WRITE) ||
                        atomic_read(&inode->i_writecount) != 1)
                return 0;

        f2fs_abort_atomic_write(inode, true);
        return 0;
}

static int f2fs_file_flush(struct file *file, fl_owner_t id)
{
        struct inode *inode = file_inode(file);

        /*
         * If the process doing a transaction is crashed, we should do
         * roll-back. Otherwise, other reader/write can see corrupted database
         * until all the writers close its file. Since this should be done
         * before dropping file lock, it needs to do in ->flush.
         */
        if (F2FS_I(inode)->atomic_write_task == current)
                f2fs_abort_atomic_write(inode, true);
        return 0;
}

static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
{
        struct f2fs_inode_info *fi = F2FS_I(inode);
        u32 masked_flags = fi->i_flags & mask;

        /* mask can be shrunk by flags_valid selector */
        iflags &= mask;

        /* Is it quota file? Do not allow user to mess with it */
        if (IS_NOQUOTA(inode))
                return -EPERM;

        if ((iflags ^ masked_flags) & F2FS_CASEFOLD_FL) {
                if (!f2fs_sb_has_casefold(F2FS_I_SB(inode)))
                        return -EOPNOTSUPP;
                if (!f2fs_empty_dir(inode))
                        return -ENOTEMPTY;
        }

        if (iflags & (F2FS_COMPR_FL | F2FS_NOCOMP_FL)) {
                if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
                        return -EOPNOTSUPP;
                if ((iflags & F2FS_COMPR_FL) && (iflags & F2FS_NOCOMP_FL))
                        return -EINVAL;
        }

        if ((iflags ^ masked_flags) & F2FS_COMPR_FL) {
                if (masked_flags & F2FS_COMPR_FL) {
                        if (!f2fs_disable_compressed_file(inode))
                                return -EINVAL;
                } else {
                        /* try to convert inline_data to support compression */
                        int err = f2fs_convert_inline_inode(inode);
                        if (err)
                                return err;
                        if (!f2fs_may_compress(inode))
                                return -EINVAL;
                        if (S_ISREG(inode->i_mode) && F2FS_HAS_BLOCKS(inode))
                                return -EINVAL;
                        if (set_compress_context(inode))
                                return -EOPNOTSUPP;
                }
        }

        fi->i_flags = iflags | (fi->i_flags & ~mask);
        f2fs_bug_on(F2FS_I_SB(inode), (fi->i_flags & F2FS_COMPR_FL) &&
                                        (fi->i_flags & F2FS_NOCOMP_FL));

        if (fi->i_flags & F2FS_PROJINHERIT_FL)
                set_inode_flag(inode, FI_PROJ_INHERIT);
        else
                clear_inode_flag(inode, FI_PROJ_INHERIT);

        inode->i_ctime = current_time(inode);
        f2fs_set_inode_flags(inode);
        f2fs_mark_inode_dirty_sync(inode, true);
        return 0;
}

/* FS_IOC_[GS]ETFLAGS and FS_IOC_FS[GS]ETXATTR support */

/*
 * To make a new on-disk f2fs i_flag gettable via FS_IOC_GETFLAGS, add an entry
 * for it to f2fs_fsflags_map[], and add its FS_*_FL equivalent to
 * F2FS_GETTABLE_FS_FL.  To also make it settable via FS_IOC_SETFLAGS, also add
 * its FS_*_FL equivalent to F2FS_SETTABLE_FS_FL.
 *
 * Translating flags to fsx_flags value used by FS_IOC_FSGETXATTR and
 * FS_IOC_FSSETXATTR is done by the VFS.
 */

static const struct {
        u32 iflag;
        u32 fsflag;
} f2fs_fsflags_map[] = {
        { F2FS_COMPR_FL,        FS_COMPR_FL },
        { F2FS_SYNC_FL,         FS_SYNC_FL },
        { F2FS_IMMUTABLE_FL,    FS_IMMUTABLE_FL },
        { F2FS_APPEND_FL,       FS_APPEND_FL },
        { F2FS_NODUMP_FL,       FS_NODUMP_FL },
        { F2FS_NOATIME_FL,      FS_NOATIME_FL },
        { F2FS_NOCOMP_FL,       FS_NOCOMP_FL },
        { F2FS_INDEX_FL,        FS_INDEX_FL },
        { F2FS_DIRSYNC_FL,      FS_DIRSYNC_FL },
        { F2FS_PROJINHERIT_FL,  FS_PROJINHERIT_FL },
        { F2FS_CASEFOLD_FL,     FS_CASEFOLD_FL },
};

#define F2FS_GETTABLE_FS_FL (           \
                FS_COMPR_FL |           \
                FS_SYNC_FL |            \
                FS_IMMUTABLE_FL |       \
                FS_APPEND_FL |          \
                FS_NODUMP_FL |          \
                FS_NOATIME_FL |         \
                FS_NOCOMP_FL |          \
                FS_INDEX_FL |           \
                FS_DIRSYNC_FL |         \
                FS_PROJINHERIT_FL |     \
                FS_ENCRYPT_FL |         \
                FS_INLINE_DATA_FL |     \
                FS_NOCOW_FL |           \
                FS_VERITY_FL |          \
                FS_CASEFOLD_FL)

#define F2FS_SETTABLE_FS_FL (           \
                FS_COMPR_FL |           \
                FS_SYNC_FL |            \
                FS_IMMUTABLE_FL |       \
                FS_APPEND_FL |          \
                FS_NODUMP_FL |          \
                FS_NOATIME_FL |         \
                FS_NOCOMP_FL |          \
                FS_DIRSYNC_FL |         \
                FS_PROJINHERIT_FL |     \
                FS_CASEFOLD_FL)

/* Convert f2fs on-disk i_flags to FS_IOC_{GET,SET}FLAGS flags */
static inline u32 f2fs_iflags_to_fsflags(u32 iflags)
{
        u32 fsflags = 0;
        int i;

        for (i = 0; i < ARRAY_SIZE(f2fs_fsflags_map); i++)
                if (iflags & f2fs_fsflags_map[i].iflag)
                        fsflags |= f2fs_fsflags_map[i].fsflag;

        return fsflags;
}

/* Convert FS_IOC_{GET,SET}FLAGS flags to f2fs on-disk i_flags */
static inline u32 f2fs_fsflags_to_iflags(u32 fsflags)
{
        u32 iflags = 0;
        int i;

        for (i = 0; i < ARRAY_SIZE(f2fs_fsflags_map); i++)
                if (fsflags & f2fs_fsflags_map[i].fsflag)
                        iflags |= f2fs_fsflags_map[i].iflag;

        return iflags;
}

static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);

        return put_user(inode->i_generation, (int __user *)arg);
}

static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
{
        struct inode *inode = file_inode(filp);
        struct mnt_idmap *idmap = file_mnt_idmap(filp);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct inode *pinode;
        loff_t isize;
        int ret;

        if (!inode_owner_or_capable(idmap, inode))
                return -EACCES;

        if (!S_ISREG(inode->i_mode))
                return -EINVAL;

        if (filp->f_flags & O_DIRECT)
                return -EINVAL;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        inode_lock(inode);

        if (!f2fs_disable_compressed_file(inode)) {
                ret = -EINVAL;
                goto out;
        }

        if (f2fs_is_atomic_file(inode))
                goto out;

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                goto out;

        f2fs_down_write(&fi->i_gc_rwsem[WRITE]);

        /*
         * Should wait end_io to count F2FS_WB_CP_DATA correctly by
         * f2fs_is_atomic_file.
         */
        if (get_dirty_pages(inode))
                f2fs_warn(sbi, "Unexpected flush for atomic writes: ino=%lu, npages=%u",
                          inode->i_ino, get_dirty_pages(inode));
        ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
        if (ret) {
                f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
                goto out;
        }

        /* Create a COW inode for atomic write */
        pinode = f2fs_iget(inode->i_sb, fi->i_pino);
        if (IS_ERR(pinode)) {
                f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
                ret = PTR_ERR(pinode);
                goto out;
        }

        ret = f2fs_get_tmpfile(idmap, pinode, &fi->cow_inode);
        iput(pinode);
        if (ret) {
                f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
                goto out;
        }

        f2fs_write_inode(inode, NULL);

        stat_inc_atomic_inode(inode);

        set_inode_flag(inode, FI_ATOMIC_FILE);
        set_inode_flag(fi->cow_inode, FI_COW_FILE);
        clear_inode_flag(fi->cow_inode, FI_INLINE_DATA);

        isize = i_size_read(inode);
        fi->original_i_size = isize;
        if (truncate) {
                set_inode_flag(inode, FI_ATOMIC_REPLACE);
                truncate_inode_pages_final(inode->i_mapping);
                f2fs_i_size_write(inode, 0);
                isize = 0;
        }
        f2fs_i_size_write(fi->cow_inode, isize);

        f2fs_up_write(&fi->i_gc_rwsem[WRITE]);

        f2fs_update_time(sbi, REQ_TIME);
        fi->atomic_write_task = current;
        stat_update_max_atomic_write(inode);
        fi->atomic_write_cnt = 0;
out:
        inode_unlock(inode);
        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_ioc_commit_atomic_write(struct file *filp)
{
        struct inode *inode = file_inode(filp);
        struct mnt_idmap *idmap = file_mnt_idmap(filp);
        int ret;

        if (!inode_owner_or_capable(idmap, inode))
                return -EACCES;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        f2fs_balance_fs(F2FS_I_SB(inode), true);

        inode_lock(inode);

        if (f2fs_is_atomic_file(inode)) {
                ret = f2fs_commit_atomic_write(inode);
                if (!ret)
                        ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);

                f2fs_abort_atomic_write(inode, ret);
        } else {
                ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 1, false);
        }

        inode_unlock(inode);
        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_ioc_abort_atomic_write(struct file *filp)
{
        struct inode *inode = file_inode(filp);
        struct mnt_idmap *idmap = file_mnt_idmap(filp);
        int ret;

        if (!inode_owner_or_capable(idmap, inode))
                return -EACCES;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        inode_lock(inode);

        f2fs_abort_atomic_write(inode, true);

        inode_unlock(inode);

        mnt_drop_write_file(filp);
        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
        return ret;
}

static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct super_block *sb = sbi->sb;
        __u32 in;
        int ret = 0;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (get_user(in, (__u32 __user *)arg))
                return -EFAULT;

        if (in != F2FS_GOING_DOWN_FULLSYNC) {
                ret = mnt_want_write_file(filp);
                if (ret) {
                        if (ret == -EROFS) {
                                ret = 0;
                                f2fs_stop_checkpoint(sbi, false,
                                                STOP_CP_REASON_SHUTDOWN);
                                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                                trace_f2fs_shutdown(sbi, in, ret);
                        }
                        return ret;
                }
        }

        switch (in) {
        case F2FS_GOING_DOWN_FULLSYNC:
                ret = freeze_bdev(sb->s_bdev);
                if (ret)
                        goto out;
                f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                thaw_bdev(sb->s_bdev);
                break;
        case F2FS_GOING_DOWN_METASYNC:
                /* do checkpoint only */
                ret = f2fs_sync_fs(sb, 1);
                if (ret)
                        goto out;
                f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                break;
        case F2FS_GOING_DOWN_NOSYNC:
                f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                break;
        case F2FS_GOING_DOWN_METAFLUSH:
                f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_META_IO);
                f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_SHUTDOWN);
                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                break;
        case F2FS_GOING_DOWN_NEED_FSCK:
                set_sbi_flag(sbi, SBI_NEED_FSCK);
                set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
                set_sbi_flag(sbi, SBI_IS_DIRTY);
                /* do checkpoint only */
                ret = f2fs_sync_fs(sb, 1);
                goto out;
        default:
                ret = -EINVAL;
                goto out;
        }

        f2fs_stop_gc_thread(sbi);
        f2fs_stop_discard_thread(sbi);

        f2fs_drop_discard_cmd(sbi);
        clear_opt(sbi, DISCARD);

        f2fs_update_time(sbi, REQ_TIME);
out:
        if (in != F2FS_GOING_DOWN_FULLSYNC)
                mnt_drop_write_file(filp);

        trace_f2fs_shutdown(sbi, in, ret);

        return ret;
}

static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct super_block *sb = inode->i_sb;
        struct fstrim_range range;
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (!f2fs_hw_support_discard(F2FS_SB(sb)))
                return -EOPNOTSUPP;

        if (copy_from_user(&range, (struct fstrim_range __user *)arg,
                                sizeof(range)))
                return -EFAULT;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        range.minlen = max((unsigned int)range.minlen,
                           bdev_discard_granularity(sb->s_bdev));
        ret = f2fs_trim_fs(F2FS_SB(sb), &range);
        mnt_drop_write_file(filp);
        if (ret < 0)
                return ret;

        if (copy_to_user((struct fstrim_range __user *)arg, &range,
                                sizeof(range)))
                return -EFAULT;
        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
        return 0;
}

static bool uuid_is_nonzero(__u8 u[16])
{
        int i;

        for (i = 0; i < 16; i++)
                if (u[i])
                        return true;
        return false;
}

static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);

        if (!f2fs_sb_has_encrypt(F2FS_I_SB(inode)))
                return -EOPNOTSUPP;

        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);

        return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
}

static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;
        return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
}

static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        int err;

        if (!f2fs_sb_has_encrypt(sbi))
                return -EOPNOTSUPP;

        err = mnt_want_write_file(filp);
        if (err)
                return err;

        f2fs_down_write(&sbi->sb_lock);

        if (uuid_is_nonzero(sbi->raw_super->encrypt_pw_salt))
                goto got_it;

        /* update superblock with uuid */
        generate_random_uuid(sbi->raw_super->encrypt_pw_salt);

        err = f2fs_commit_super(sbi, false);
        if (err) {
                /* undo new data */
                memset(sbi->raw_super->encrypt_pw_salt, 0, 16);
                goto out_err;
        }
got_it:
        if (copy_to_user((__u8 __user *)arg, sbi->raw_super->encrypt_pw_salt,
                                                                        16))
                err = -EFAULT;
out_err:
        f2fs_up_write(&sbi->sb_lock);
        mnt_drop_write_file(filp);
        return err;
}

static int f2fs_ioc_get_encryption_policy_ex(struct file *filp,
                                             unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
}

static int f2fs_ioc_add_encryption_key(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_add_key(filp, (void __user *)arg);
}

static int f2fs_ioc_remove_encryption_key(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
}

static int f2fs_ioc_remove_encryption_key_all_users(struct file *filp,
                                                    unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_remove_key_all_users(filp, (void __user *)arg);
}

static int f2fs_ioc_get_encryption_key_status(struct file *filp,
                                              unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
}

static int f2fs_ioc_get_encryption_nonce(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
}

static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_gc_control gc_control = { .victim_segno = NULL_SEGNO,
                        .no_bg_gc = false,
                        .should_migrate_blocks = false,
                        .nr_free_secs = 0 };
        __u32 sync;
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (get_user(sync, (__u32 __user *)arg))
                return -EFAULT;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        if (!sync) {
                if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
                        ret = -EBUSY;
                        goto out;
                }
        } else {
                f2fs_down_write(&sbi->gc_lock);
        }

        gc_control.init_gc_type = sync ? FG_GC : BG_GC;
        gc_control.err_gc_skipped = sync;
        ret = f2fs_gc(sbi, &gc_control);
out:
        mnt_drop_write_file(filp);
        return ret;
}

static int __f2fs_ioc_gc_range(struct file *filp, struct f2fs_gc_range *range)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
        struct f2fs_gc_control gc_control = {
                        .init_gc_type = range->sync ? FG_GC : BG_GC,
                        .no_bg_gc = false,
                        .should_migrate_blocks = false,
                        .err_gc_skipped = range->sync,
                        .nr_free_secs = 0 };
        u64 end;
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        end = range->start + range->len;
        if (end < range->start || range->start < MAIN_BLKADDR(sbi) ||
                                        end >= MAX_BLKADDR(sbi))
                return -EINVAL;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

do_more:
        if (!range->sync) {
                if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
                        ret = -EBUSY;
                        goto out;
                }
        } else {
                f2fs_down_write(&sbi->gc_lock);
        }

        gc_control.victim_segno = GET_SEGNO(sbi, range->start);
        ret = f2fs_gc(sbi, &gc_control);
        if (ret) {
                if (ret == -EBUSY)
                        ret = -EAGAIN;
                goto out;
        }
        range->start += CAP_BLKS_PER_SEC(sbi);
        if (range->start <= end)
                goto do_more;
out:
        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_ioc_gc_range(struct file *filp, unsigned long arg)
{
        struct f2fs_gc_range range;

        if (copy_from_user(&range, (struct f2fs_gc_range __user *)arg,
                                                        sizeof(range)))
                return -EFAULT;
        return __f2fs_ioc_gc_range(filp, &range);
}

static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
                f2fs_info(sbi, "Skipping Checkpoint. Checkpoints currently disabled.");
                return -EINVAL;
        }

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        ret = f2fs_sync_fs(sbi->sb, 1);

        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
                                        struct file *filp,
                                        struct f2fs_defragment *range)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_map_blocks map = { .m_next_extent = NULL,
                                        .m_seg_type = NO_CHECK_TYPE,
                                        .m_may_create = false };
        struct extent_info ei = {0, };
        pgoff_t pg_start, pg_end, next_pgofs;
        unsigned int blk_per_seg = sbi->blocks_per_seg;
        unsigned int total = 0, sec_num;
        block_t blk_end = 0;
        bool fragmented = false;
        int err;

        pg_start = range->start >> PAGE_SHIFT;
        pg_end = (range->start + range->len) >> PAGE_SHIFT;

        f2fs_balance_fs(sbi, true);

        inode_lock(inode);

        /* if in-place-update policy is enabled, don't waste time here */
        set_inode_flag(inode, FI_OPU_WRITE);
        if (f2fs_should_update_inplace(inode, NULL)) {
                err = -EINVAL;
                goto out;
        }

        /* writeback all dirty pages in the range */
        err = filemap_write_and_wait_range(inode->i_mapping, range->start,
                                                range->start + range->len - 1);
        if (err)
                goto out;

        /*
         * lookup mapping info in extent cache, skip defragmenting if physical
         * block addresses are continuous.
         */
        if (f2fs_lookup_read_extent_cache(inode, pg_start, &ei)) {
                if (ei.fofs + ei.len >= pg_end)
                        goto out;
        }

        map.m_lblk = pg_start;
        map.m_next_pgofs = &next_pgofs;

        /*
         * lookup mapping info in dnode page cache, skip defragmenting if all
         * physical block addresses are continuous even if there are hole(s)
         * in logical blocks.
         */
        while (map.m_lblk < pg_end) {
                map.m_len = pg_end - map.m_lblk;
                err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
                if (err)
                        goto out;

                if (!(map.m_flags & F2FS_MAP_FLAGS)) {
                        map.m_lblk = next_pgofs;
                        continue;
                }

                if (blk_end && blk_end != map.m_pblk)
                        fragmented = true;

                /* record total count of block that we're going to move */
                total += map.m_len;

                blk_end = map.m_pblk + map.m_len;

                map.m_lblk += map.m_len;
        }

        if (!fragmented) {
                total = 0;
                goto out;
        }

        sec_num = DIV_ROUND_UP(total, CAP_BLKS_PER_SEC(sbi));

        /*
         * make sure there are enough free section for LFS allocation, this can
         * avoid defragment running in SSR mode when free section are allocated
         * intensively
         */
        if (has_not_enough_free_secs(sbi, 0, sec_num)) {
                err = -EAGAIN;
                goto out;
        }

        map.m_lblk = pg_start;
        map.m_len = pg_end - pg_start;
        total = 0;

        while (map.m_lblk < pg_end) {
                pgoff_t idx;
                int cnt = 0;

do_map:
                map.m_len = pg_end - map.m_lblk;
                err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
                if (err)
                        goto clear_out;

                if (!(map.m_flags & F2FS_MAP_FLAGS)) {
                        map.m_lblk = next_pgofs;
                        goto check;
                }

                set_inode_flag(inode, FI_SKIP_WRITES);

                idx = map.m_lblk;
                while (idx < map.m_lblk + map.m_len && cnt < blk_per_seg) {
                        struct page *page;

                        page = f2fs_get_lock_data_page(inode, idx, true);
                        if (IS_ERR(page)) {
                                err = PTR_ERR(page);
                                goto clear_out;
                        }

                        set_page_dirty(page);
                        set_page_private_gcing(page);
                        f2fs_put_page(page, 1);

                        idx++;
                        cnt++;
                        total++;
                }

                map.m_lblk = idx;
check:
                if (map.m_lblk < pg_end && cnt < blk_per_seg)
                        goto do_map;

                clear_inode_flag(inode, FI_SKIP_WRITES);

                err = filemap_fdatawrite(inode->i_mapping);
                if (err)
                        goto out;
        }
clear_out:
        clear_inode_flag(inode, FI_SKIP_WRITES);
out:
        clear_inode_flag(inode, FI_OPU_WRITE);
        inode_unlock(inode);
        if (!err)
                range->len = (u64)total << PAGE_SHIFT;
        return err;
}

static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_defragment range;
        int err;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (!S_ISREG(inode->i_mode) || f2fs_is_atomic_file(inode))
                return -EINVAL;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
                                                        sizeof(range)))
                return -EFAULT;

        /* verify alignment of offset & size */
        if (range.start & (F2FS_BLKSIZE - 1) || range.len & (F2FS_BLKSIZE - 1))
                return -EINVAL;

        if (unlikely((range.start + range.len) >> PAGE_SHIFT >
                                        max_file_blocks(inode)))
                return -EINVAL;

        err = mnt_want_write_file(filp);
        if (err)
                return err;

        err = f2fs_defragment_range(sbi, filp, &range);
        mnt_drop_write_file(filp);

        f2fs_update_time(sbi, REQ_TIME);
        if (err < 0)
                return err;

        if (copy_to_user((struct f2fs_defragment __user *)arg, &range,
                                                        sizeof(range)))
                return -EFAULT;

        return 0;
}

static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
                        struct file *file_out, loff_t pos_out, size_t len)
{
        struct inode *src = file_inode(file_in);
        struct inode *dst = file_inode(file_out);
        struct f2fs_sb_info *sbi = F2FS_I_SB(src);
        size_t olen = len, dst_max_i_size = 0;
        size_t dst_osize;
        int ret;

        if (file_in->f_path.mnt != file_out->f_path.mnt ||
                                src->i_sb != dst->i_sb)
                return -EXDEV;

        if (unlikely(f2fs_readonly(src->i_sb)))
                return -EROFS;

        if (!S_ISREG(src->i_mode) || !S_ISREG(dst->i_mode))
                return -EINVAL;

        if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
                return -EOPNOTSUPP;

        if (pos_out < 0 || pos_in < 0)
                return -EINVAL;

        if (src == dst) {
                if (pos_in == pos_out)
                        return 0;
                if (pos_out > pos_in && pos_out < pos_in + len)
                        return -EINVAL;
        }

        inode_lock(src);
        if (src != dst) {
                ret = -EBUSY;
                if (!inode_trylock(dst))
                        goto out;
        }

        ret = -EINVAL;
        if (pos_in + len > src->i_size || pos_in + len < pos_in)
                goto out_unlock;
        if (len == 0)
                olen = len = src->i_size - pos_in;
        if (pos_in + len == src->i_size)
                len = ALIGN(src->i_size, F2FS_BLKSIZE) - pos_in;
        if (len == 0) {
                ret = 0;
                goto out_unlock;
        }

        dst_osize = dst->i_size;
        if (pos_out + olen > dst->i_size)
                dst_max_i_size = pos_out + olen;

        /* verify the end result is block aligned */
        if (!IS_ALIGNED(pos_in, F2FS_BLKSIZE) ||
                        !IS_ALIGNED(pos_in + len, F2FS_BLKSIZE) ||
                        !IS_ALIGNED(pos_out, F2FS_BLKSIZE))
                goto out_unlock;

        ret = f2fs_convert_inline_inode(src);
        if (ret)
                goto out_unlock;

        ret = f2fs_convert_inline_inode(dst);
        if (ret)
                goto out_unlock;

        /* write out all dirty pages from offset */
        ret = filemap_write_and_wait_range(src->i_mapping,
                                        pos_in, pos_in + len);
        if (ret)
                goto out_unlock;

        ret = filemap_write_and_wait_range(dst->i_mapping,
                                        pos_out, pos_out + len);
        if (ret)
                goto out_unlock;

        f2fs_balance_fs(sbi, true);

        f2fs_down_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
        if (src != dst) {
                ret = -EBUSY;
                if (!f2fs_down_write_trylock(&F2FS_I(dst)->i_gc_rwsem[WRITE]))
                        goto out_src;
        }

        f2fs_lock_op(sbi);
        ret = __exchange_data_block(src, dst, pos_in >> F2FS_BLKSIZE_BITS,
                                pos_out >> F2FS_BLKSIZE_BITS,
                                len >> F2FS_BLKSIZE_BITS, false);

        if (!ret) {
                if (dst_max_i_size)
                        f2fs_i_size_write(dst, dst_max_i_size);
                else if (dst_osize != dst->i_size)
                        f2fs_i_size_write(dst, dst_osize);
        }
        f2fs_unlock_op(sbi);

        if (src != dst)
                f2fs_up_write(&F2FS_I(dst)->i_gc_rwsem[WRITE]);
out_src:
        f2fs_up_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
out_unlock:
        if (src != dst)
                inode_unlock(dst);
out:
        inode_unlock(src);
        return ret;
}

static int __f2fs_ioc_move_range(struct file *filp,
                                struct f2fs_move_range *range)
{
        struct fd dst;
        int err;

        if (!(filp->f_mode & FMODE_READ) ||
                        !(filp->f_mode & FMODE_WRITE))
                return -EBADF;

        dst = fdget(range->dst_fd);
        if (!dst.file)
                return -EBADF;

        if (!(dst.file->f_mode & FMODE_WRITE)) {
                err = -EBADF;
                goto err_out;
        }

        err = mnt_want_write_file(filp);
        if (err)
                goto err_out;

        err = f2fs_move_file_range(filp, range->pos_in, dst.file,
                                        range->pos_out, range->len);

        mnt_drop_write_file(filp);
err_out:
        fdput(dst);
        return err;
}

static int f2fs_ioc_move_range(struct file *filp, unsigned long arg)
{
        struct f2fs_move_range range;

        if (copy_from_user(&range, (struct f2fs_move_range __user *)arg,
                                                        sizeof(range)))
                return -EFAULT;
        return __f2fs_ioc_move_range(filp, &range);
}

static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct sit_info *sm = SIT_I(sbi);
        unsigned int start_segno = 0, end_segno = 0;
        unsigned int dev_start_segno = 0, dev_end_segno = 0;
        struct f2fs_flush_device range;
        struct f2fs_gc_control gc_control = {
                        .init_gc_type = FG_GC,
                        .should_migrate_blocks = true,
                        .err_gc_skipped = true,
                        .nr_free_secs = 0 };
        int ret;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
                return -EINVAL;

        if (copy_from_user(&range, (struct f2fs_flush_device __user *)arg,
                                                        sizeof(range)))
                return -EFAULT;

        if (!f2fs_is_multi_device(sbi) || sbi->s_ndevs - 1 <= range.dev_num ||
                        __is_large_section(sbi)) {
                f2fs_warn(sbi, "Can't flush %u in %d for segs_per_sec %u != 1",
                          range.dev_num, sbi->s_ndevs, sbi->segs_per_sec);
                return -EINVAL;
        }

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        if (range.dev_num != 0)
                dev_start_segno = GET_SEGNO(sbi, FDEV(range.dev_num).start_blk);
        dev_end_segno = GET_SEGNO(sbi, FDEV(range.dev_num).end_blk);

        start_segno = sm->last_victim[FLUSH_DEVICE];
        if (start_segno < dev_start_segno || start_segno >= dev_end_segno)
                start_segno = dev_start_segno;
        end_segno = min(start_segno + range.segments, dev_end_segno);

        while (start_segno < end_segno) {
                if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
                        ret = -EBUSY;
                        goto out;
                }
                sm->last_victim[GC_CB] = end_segno + 1;
                sm->last_victim[GC_GREEDY] = end_segno + 1;
                sm->last_victim[ALLOC_NEXT] = end_segno + 1;

                gc_control.victim_segno = start_segno;
                ret = f2fs_gc(sbi, &gc_control);
                if (ret == -EAGAIN)
                        ret = 0;
                else if (ret < 0)
                        break;
                start_segno++;
        }
out:
        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_ioc_get_features(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        u32 sb_feature = le32_to_cpu(F2FS_I_SB(inode)->raw_super->feature);

        /* Must validate to set it with SQLite behavior in Android. */
        sb_feature |= F2FS_FEATURE_ATOMIC_WRITE;

        return put_user(sb_feature, (u32 __user *)arg);
}

#ifdef CONFIG_QUOTA
int f2fs_transfer_project_quota(struct inode *inode, kprojid_t kprojid)
{
        struct dquot *transfer_to[MAXQUOTAS] = {};
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct super_block *sb = sbi->sb;
        int err = 0;

        transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
        if (!IS_ERR(transfer_to[PRJQUOTA])) {
                err = __dquot_transfer(inode, transfer_to);
                if (err)
                        set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
                dqput(transfer_to[PRJQUOTA]);
        }
        return err;
}

static int f2fs_ioc_setproject(struct inode *inode, __u32 projid)
{
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_inode *ri = NULL;
        kprojid_t kprojid;
        int err;

        if (!f2fs_sb_has_project_quota(sbi)) {
                if (projid != F2FS_DEF_PROJID)
                        return -EOPNOTSUPP;
                else
                        return 0;
        }

        if (!f2fs_has_extra_attr(inode))
                return -EOPNOTSUPP;

        kprojid = make_kprojid(&init_user_ns, (projid_t)projid);

        if (projid_eq(kprojid, fi->i_projid))
                return 0;

        err = -EPERM;
        /* Is it quota file? Do not allow user to mess with it */
        if (IS_NOQUOTA(inode))
                return err;

        if (!F2FS_FITS_IN_INODE(ri, fi->i_extra_isize, i_projid))
                return -EOVERFLOW;

        err = f2fs_dquot_initialize(inode);
        if (err)
                return err;

        f2fs_lock_op(sbi);
        err = f2fs_transfer_project_quota(inode, kprojid);
        if (err)
                goto out_unlock;

        fi->i_projid = kprojid;
        inode->i_ctime = current_time(inode);
        f2fs_mark_inode_dirty_sync(inode, true);
out_unlock:
        f2fs_unlock_op(sbi);
        return err;
}
#else
int f2fs_transfer_project_quota(struct inode *inode, kprojid_t kprojid)
{
        return 0;
}

static int f2fs_ioc_setproject(struct inode *inode, __u32 projid)
{
        if (projid != F2FS_DEF_PROJID)
                return -EOPNOTSUPP;
        return 0;
}
#endif

int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
        struct inode *inode = d_inode(dentry);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        u32 fsflags = f2fs_iflags_to_fsflags(fi->i_flags);

        if (IS_ENCRYPTED(inode))
                fsflags |= FS_ENCRYPT_FL;
        if (IS_VERITY(inode))
                fsflags |= FS_VERITY_FL;
        if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode))
                fsflags |= FS_INLINE_DATA_FL;
        if (is_inode_flag_set(inode, FI_PIN_FILE))
                fsflags |= FS_NOCOW_FL;

        fileattr_fill_flags(fa, fsflags & F2FS_GETTABLE_FS_FL);

        if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)))
                fa->fsx_projid = from_kprojid(&init_user_ns, fi->i_projid);

        return 0;
}

int f2fs_fileattr_set(struct mnt_idmap *idmap,
                      struct dentry *dentry, struct fileattr *fa)
{
        struct inode *inode = d_inode(dentry);
        u32 fsflags = fa->flags, mask = F2FS_SETTABLE_FS_FL;
        u32 iflags;
        int err;

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
                return -EIO;
        if (!f2fs_is_checkpoint_ready(F2FS_I_SB(inode)))
                return -ENOSPC;
        if (fsflags & ~F2FS_GETTABLE_FS_FL)
                return -EOPNOTSUPP;
        fsflags &= F2FS_SETTABLE_FS_FL;
        if (!fa->flags_valid)
                mask &= FS_COMMON_FL;

        iflags = f2fs_fsflags_to_iflags(fsflags);
        if (f2fs_mask_flags(inode->i_mode, iflags) != iflags)
                return -EOPNOTSUPP;

        err = f2fs_setflags_common(inode, iflags, f2fs_fsflags_to_iflags(mask));
        if (!err)
                err = f2fs_ioc_setproject(inode, fa->fsx_projid);

        return err;
}

int f2fs_pin_file_control(struct inode *inode, bool inc)
{
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

        /* Use i_gc_failures for normal file as a risk signal. */
        if (inc)
                f2fs_i_gc_failures_write(inode,
                                fi->i_gc_failures[GC_FAILURE_PIN] + 1);

        if (fi->i_gc_failures[GC_FAILURE_PIN] > sbi->gc_pin_file_threshold) {
                f2fs_warn(sbi, "%s: Enable GC = ino %lx after %x GC trials",
                          __func__, inode->i_ino,
                          fi->i_gc_failures[GC_FAILURE_PIN]);
                clear_inode_flag(inode, FI_PIN_FILE);
                return -EAGAIN;
        }
        return 0;
}

static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        __u32 pin;
        int ret = 0;

        if (get_user(pin, (__u32 __user *)arg))
                return -EFAULT;

        if (!S_ISREG(inode->i_mode))
                return -EINVAL;

        if (f2fs_readonly(F2FS_I_SB(inode)->sb))
                return -EROFS;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        inode_lock(inode);

        if (!pin) {
                clear_inode_flag(inode, FI_PIN_FILE);
                f2fs_i_gc_failures_write(inode, 0);
                goto done;
        }

        if (f2fs_should_update_outplace(inode, NULL)) {
                ret = -EINVAL;
                goto out;
        }

        if (f2fs_pin_file_control(inode, false)) {
                ret = -EAGAIN;
                goto out;
        }

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                goto out;

        if (!f2fs_disable_compressed_file(inode)) {
                ret = -EOPNOTSUPP;
                goto out;
        }

        set_inode_flag(inode, FI_PIN_FILE);
        ret = F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN];
done:
        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
out:
        inode_unlock(inode);
        mnt_drop_write_file(filp);
        return ret;
}

static int f2fs_ioc_get_pin_file(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        __u32 pin = 0;

        if (is_inode_flag_set(inode, FI_PIN_FILE))
                pin = F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN];
        return put_user(pin, (u32 __user *)arg);
}

int f2fs_precache_extents(struct inode *inode)
{
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_map_blocks map;
        pgoff_t m_next_extent;
        loff_t end;
        int err;

        if (is_inode_flag_set(inode, FI_NO_EXTENT))
                return -EOPNOTSUPP;

        map.m_lblk = 0;
        map.m_next_pgofs = NULL;
        map.m_next_extent = &m_next_extent;
        map.m_seg_type = NO_CHECK_TYPE;
        map.m_may_create = false;
        end = max_file_blocks(inode);

        while (map.m_lblk < end) {
                map.m_len = end - map.m_lblk;

                f2fs_down_write(&fi->i_gc_rwsem[WRITE]);
                err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_PRECACHE);
                f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
                if (err)
                        return err;

                map.m_lblk = m_next_extent;
        }

        return 0;
}

static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
{
        return f2fs_precache_extents(file_inode(filp));
}

static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
        __u64 block_count;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        if (copy_from_user(&block_count, (void __user *)arg,
                           sizeof(block_count)))
                return -EFAULT;

        return f2fs_resize_fs(sbi, block_count);
}

static int f2fs_ioc_enable_verity(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);

        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);

        if (!f2fs_sb_has_verity(F2FS_I_SB(inode))) {
                f2fs_warn(F2FS_I_SB(inode),
                          "Can't enable fs-verity on inode %lu: the verity feature is not enabled on this filesystem",
                          inode->i_ino);
                return -EOPNOTSUPP;
        }

        return fsverity_ioctl_enable(filp, (const void __user *)arg);
}

static int f2fs_ioc_measure_verity(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_verity(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fsverity_ioctl_measure(filp, (void __user *)arg);
}

static int f2fs_ioc_read_verity_metadata(struct file *filp, unsigned long arg)
{
        if (!f2fs_sb_has_verity(F2FS_I_SB(file_inode(filp))))
                return -EOPNOTSUPP;

        return fsverity_ioctl_read_metadata(filp, (const void __user *)arg);
}

static int f2fs_ioc_getfslabel(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        char *vbuf;
        int count;
        int err = 0;

        vbuf = f2fs_kzalloc(sbi, MAX_VOLUME_NAME, GFP_KERNEL);
        if (!vbuf)
                return -ENOMEM;

        f2fs_down_read(&sbi->sb_lock);
        count = utf16s_to_utf8s(sbi->raw_super->volume_name,
                        ARRAY_SIZE(sbi->raw_super->volume_name),
                        UTF16_LITTLE_ENDIAN, vbuf, MAX_VOLUME_NAME);
        f2fs_up_read(&sbi->sb_lock);

        if (copy_to_user((char __user *)arg, vbuf,
                                min(FSLABEL_MAX, count)))
                err = -EFAULT;

        kfree(vbuf);
        return err;
}

static int f2fs_ioc_setfslabel(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        char *vbuf;
        int err = 0;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        vbuf = strndup_user((const char __user *)arg, FSLABEL_MAX);
        if (IS_ERR(vbuf))
                return PTR_ERR(vbuf);

        err = mnt_want_write_file(filp);
        if (err)
                goto out;

        f2fs_down_write(&sbi->sb_lock);

        memset(sbi->raw_super->volume_name, 0,
                        sizeof(sbi->raw_super->volume_name));
        utf8s_to_utf16s(vbuf, strlen(vbuf), UTF16_LITTLE_ENDIAN,
                        sbi->raw_super->volume_name,
                        ARRAY_SIZE(sbi->raw_super->volume_name));

        err = f2fs_commit_super(sbi, false);

        f2fs_up_write(&sbi->sb_lock);

        mnt_drop_write_file(filp);
out:
        kfree(vbuf);
        return err;
}

static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        __u64 blocks;

        if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
                return -EOPNOTSUPP;

        if (!f2fs_compressed_file(inode))
                return -EINVAL;

        blocks = atomic_read(&F2FS_I(inode)->i_compr_blocks);
        return put_user(blocks, (u64 __user *)arg);
}

static int release_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
        unsigned int released_blocks = 0;
        int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
        block_t blkaddr;
        int i;

        for (i = 0; i < count; i++) {
                blkaddr = data_blkaddr(dn->inode, dn->node_page,
                                                dn->ofs_in_node + i);

                if (!__is_valid_data_blkaddr(blkaddr))
                        continue;
                if (unlikely(!f2fs_is_valid_blkaddr(sbi, blkaddr,
                                        DATA_GENERIC_ENHANCE))) {
                        f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
                        return -EFSCORRUPTED;
                }
        }

        while (count) {
                int compr_blocks = 0;

                for (i = 0; i < cluster_size; i++, dn->ofs_in_node++) {
                        blkaddr = f2fs_data_blkaddr(dn);

                        if (i == 0) {
                                if (blkaddr == COMPRESS_ADDR)
                                        continue;
                                dn->ofs_in_node += cluster_size;
                                goto next;
                        }

                        if (__is_valid_data_blkaddr(blkaddr))
                                compr_blocks++;

                        if (blkaddr != NEW_ADDR)
                                continue;

                        dn->data_blkaddr = NULL_ADDR;
                        f2fs_set_data_blkaddr(dn);
                }

                f2fs_i_compr_blocks_update(dn->inode, compr_blocks, false);
                dec_valid_block_count(sbi, dn->inode,
                                        cluster_size - compr_blocks);

                released_blocks += cluster_size - compr_blocks;
next:
                count -= cluster_size;
        }

        return released_blocks;
}

static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        pgoff_t page_idx = 0, last_idx;
        unsigned int released_blocks = 0;
        int ret;
        int writecount;

        if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
                return -EOPNOTSUPP;

        if (!f2fs_compressed_file(inode))
                return -EINVAL;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        f2fs_balance_fs(F2FS_I_SB(inode), true);

        inode_lock(inode);

        writecount = atomic_read(&inode->i_writecount);
        if ((filp->f_mode & FMODE_WRITE && writecount != 1) ||
                        (!(filp->f_mode & FMODE_WRITE) && writecount)) {
                ret = -EBUSY;
                goto out;
        }

        if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto out;
        }

        ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
        if (ret)
                goto out;

        set_inode_flag(inode, FI_COMPRESS_RELEASED);
        inode->i_ctime = current_time(inode);
        f2fs_mark_inode_dirty_sync(inode, true);

        if (!atomic_read(&F2FS_I(inode)->i_compr_blocks))
                goto out;

        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        filemap_invalidate_lock(inode->i_mapping);

        last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);

        while (page_idx < last_idx) {
                struct dnode_of_data dn;
                pgoff_t end_offset, count;

                set_new_dnode(&dn, inode, NULL, NULL, 0);
                ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
                if (ret) {
                        if (ret == -ENOENT) {
                                page_idx = f2fs_get_next_page_offset(&dn,
                                                                page_idx);
                                ret = 0;
                                continue;
                        }
                        break;
                }

                end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
                count = min(end_offset - dn.ofs_in_node, last_idx - page_idx);
                count = round_up(count, F2FS_I(inode)->i_cluster_size);

                ret = release_compress_blocks(&dn, count);

                f2fs_put_dnode(&dn);

                if (ret < 0)
                        break;

                page_idx += count;
                released_blocks += ret;
        }

        filemap_invalidate_unlock(inode->i_mapping);
        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
out:
        inode_unlock(inode);

        mnt_drop_write_file(filp);

        if (ret >= 0) {
                ret = put_user(released_blocks, (u64 __user *)arg);
        } else if (released_blocks &&
                        atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
                set_sbi_flag(sbi, SBI_NEED_FSCK);
                f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
                        "iblocks=%llu, released=%u, compr_blocks=%u, "
                        "run fsck to fix.",
                        __func__, inode->i_ino, inode->i_blocks,
                        released_blocks,
                        atomic_read(&F2FS_I(inode)->i_compr_blocks));
        }

        return ret;
}

static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
        unsigned int reserved_blocks = 0;
        int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
        block_t blkaddr;
        int i;

        for (i = 0; i < count; i++) {
                blkaddr = data_blkaddr(dn->inode, dn->node_page,
                                                dn->ofs_in_node + i);

                if (!__is_valid_data_blkaddr(blkaddr))
                        continue;
                if (unlikely(!f2fs_is_valid_blkaddr(sbi, blkaddr,
                                        DATA_GENERIC_ENHANCE))) {
                        f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
                        return -EFSCORRUPTED;
                }
        }

        while (count) {
                int compr_blocks = 0;
                blkcnt_t reserved;
                int ret;

                for (i = 0; i < cluster_size; i++, dn->ofs_in_node++) {
                        blkaddr = f2fs_data_blkaddr(dn);

                        if (i == 0) {
                                if (blkaddr == COMPRESS_ADDR)
                                        continue;
                                dn->ofs_in_node += cluster_size;
                                goto next;
                        }

                        if (__is_valid_data_blkaddr(blkaddr)) {
                                compr_blocks++;
                                continue;
                        }

                        dn->data_blkaddr = NEW_ADDR;
                        f2fs_set_data_blkaddr(dn);
                }

                reserved = cluster_size - compr_blocks;
                ret = inc_valid_block_count(sbi, dn->inode, &reserved);
                if (ret)
                        return ret;

                if (reserved != cluster_size - compr_blocks)
                        return -ENOSPC;

                f2fs_i_compr_blocks_update(dn->inode, compr_blocks, true);

                reserved_blocks += reserved;
next:
                count -= cluster_size;
        }

        return reserved_blocks;
}

static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        pgoff_t page_idx = 0, last_idx;
        unsigned int reserved_blocks = 0;
        int ret;

        if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
                return -EOPNOTSUPP;

        if (!f2fs_compressed_file(inode))
                return -EINVAL;

        if (f2fs_readonly(sbi->sb))
                return -EROFS;

        ret = mnt_want_write_file(filp);
        if (ret)
                return ret;

        if (atomic_read(&F2FS_I(inode)->i_compr_blocks))
                goto out;

        f2fs_balance_fs(F2FS_I_SB(inode), true);

        inode_lock(inode);

        if (!is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto unlock_inode;
        }

        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        filemap_invalidate_lock(inode->i_mapping);

        last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);

        while (page_idx < last_idx) {
                struct dnode_of_data dn;
                pgoff_t end_offset, count;

                set_new_dnode(&dn, inode, NULL, NULL, 0);
                ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
                if (ret) {
                        if (ret == -ENOENT) {
                                page_idx = f2fs_get_next_page_offset(&dn,
                                                                page_idx);
                                ret = 0;
                                continue;
                        }
                        break;
                }

                end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
                count = min(end_offset - dn.ofs_in_node, last_idx - page_idx);
                count = round_up(count, F2FS_I(inode)->i_cluster_size);

                ret = reserve_compress_blocks(&dn, count);

                f2fs_put_dnode(&dn);

                if (ret < 0)
                        break;

                page_idx += count;
                reserved_blocks += ret;
        }

        filemap_invalidate_unlock(inode->i_mapping);
        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);

        if (ret >= 0) {
                clear_inode_flag(inode, FI_COMPRESS_RELEASED);
                inode->i_ctime = current_time(inode);
                f2fs_mark_inode_dirty_sync(inode, true);
        }
unlock_inode:
        inode_unlock(inode);
out:
        mnt_drop_write_file(filp);

        if (ret >= 0) {
                ret = put_user(reserved_blocks, (u64 __user *)arg);
        } else if (reserved_blocks &&
                        atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
                set_sbi_flag(sbi, SBI_NEED_FSCK);
                f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
                        "iblocks=%llu, reserved=%u, compr_blocks=%u, "
                        "run fsck to fix.",
                        __func__, inode->i_ino, inode->i_blocks,
                        reserved_blocks,
                        atomic_read(&F2FS_I(inode)->i_compr_blocks));
        }

        return ret;
}

static int f2fs_secure_erase(struct block_device *bdev, struct inode *inode,
                pgoff_t off, block_t block, block_t len, u32 flags)
{
        sector_t sector = SECTOR_FROM_BLOCK(block);
        sector_t nr_sects = SECTOR_FROM_BLOCK(len);
        int ret = 0;

        if (flags & F2FS_TRIM_FILE_DISCARD) {
                if (bdev_max_secure_erase_sectors(bdev))
                        ret = blkdev_issue_secure_erase(bdev, sector, nr_sects,
                                        GFP_NOFS);
                else
                        ret = blkdev_issue_discard(bdev, sector, nr_sects,
                                        GFP_NOFS);
        }

        if (!ret && (flags & F2FS_TRIM_FILE_ZEROOUT)) {
                if (IS_ENCRYPTED(inode))
                        ret = fscrypt_zeroout_range(inode, off, block, len);
                else
                        ret = blkdev_issue_zeroout(bdev, sector, nr_sects,
                                        GFP_NOFS, 0);
        }

        return ret;
}

static int f2fs_sec_trim_file(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct address_space *mapping = inode->i_mapping;
        struct block_device *prev_bdev = NULL;
        struct f2fs_sectrim_range range;
        pgoff_t index, pg_end, prev_index = 0;
        block_t prev_block = 0, len = 0;
        loff_t end_addr;
        bool to_end = false;
        int ret = 0;

        if (!(filp->f_mode & FMODE_WRITE))
                return -EBADF;

        if (copy_from_user(&range, (struct f2fs_sectrim_range __user *)arg,
                                sizeof(range)))
                return -EFAULT;

        if (range.flags == 0 || (range.flags & ~F2FS_TRIM_FILE_MASK) ||
                        !S_ISREG(inode->i_mode))
                return -EINVAL;

        if (((range.flags & F2FS_TRIM_FILE_DISCARD) &&
                        !f2fs_hw_support_discard(sbi)) ||
                        ((range.flags & F2FS_TRIM_FILE_ZEROOUT) &&
                         IS_ENCRYPTED(inode) && f2fs_is_multi_device(sbi)))
                return -EOPNOTSUPP;

        file_start_write(filp);
        inode_lock(inode);

        if (f2fs_is_atomic_file(inode) || f2fs_compressed_file(inode) ||
                        range.start >= inode->i_size) {
                ret = -EINVAL;
                goto err;
        }

        if (range.len == 0)
                goto err;

        if (inode->i_size - range.start > range.len) {
                end_addr = range.start + range.len;
        } else {
                end_addr = range.len == (u64)-1 ?
                        sbi->sb->s_maxbytes : inode->i_size;
                to_end = true;
        }

        if (!IS_ALIGNED(range.start, F2FS_BLKSIZE) ||
                        (!to_end && !IS_ALIGNED(end_addr, F2FS_BLKSIZE))) {
                ret = -EINVAL;
                goto err;
        }

        index = F2FS_BYTES_TO_BLK(range.start);
        pg_end = DIV_ROUND_UP(end_addr, F2FS_BLKSIZE);

        ret = f2fs_convert_inline_inode(inode);
        if (ret)
                goto err;

        f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        filemap_invalidate_lock(mapping);

        ret = filemap_write_and_wait_range(mapping, range.start,
                        to_end ? LLONG_MAX : end_addr - 1);
        if (ret)
                goto out;

        truncate_inode_pages_range(mapping, range.start,
                        to_end ? -1 : end_addr - 1);

        while (index < pg_end) {
                struct dnode_of_data dn;
                pgoff_t end_offset, count;
                int i;

                set_new_dnode(&dn, inode, NULL, NULL, 0);
                ret = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
                if (ret) {
                        if (ret == -ENOENT) {
                                index = f2fs_get_next_page_offset(&dn, index);
                                continue;
                        }
                        goto out;
                }

                end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
                count = min(end_offset - dn.ofs_in_node, pg_end - index);
                for (i = 0; i < count; i++, index++, dn.ofs_in_node++) {
                        struct block_device *cur_bdev;
                        block_t blkaddr = f2fs_data_blkaddr(&dn);

                        if (!__is_valid_data_blkaddr(blkaddr))
                                continue;

                        if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
                                                DATA_GENERIC_ENHANCE)) {
                                ret = -EFSCORRUPTED;
                                f2fs_put_dnode(&dn);
                                f2fs_handle_error(sbi,
                                                ERROR_INVALID_BLKADDR);
                                goto out;
                        }

                        cur_bdev = f2fs_target_device(sbi, blkaddr, NULL);
                        if (f2fs_is_multi_device(sbi)) {
                                int di = f2fs_target_device_index(sbi, blkaddr);

                                blkaddr -= FDEV(di).start_blk;
                        }

                        if (len) {
                                if (prev_bdev == cur_bdev &&
                                                index == prev_index + len &&
                                                blkaddr == prev_block + len) {
                                        len++;
                                } else {
                                        ret = f2fs_secure_erase(prev_bdev,
                                                inode, prev_index, prev_block,
                                                len, range.flags);
                                        if (ret) {
                                                f2fs_put_dnode(&dn);
                                                goto out;
                                        }

                                        len = 0;
                                }
                        }

                        if (!len) {
                                prev_bdev = cur_bdev;
                                prev_index = index;
                                prev_block = blkaddr;
                                len = 1;
                        }
                }

                f2fs_put_dnode(&dn);

                if (fatal_signal_pending(current)) {
                        ret = -EINTR;
                        goto out;
                }
                cond_resched();
        }

        if (len)
                ret = f2fs_secure_erase(prev_bdev, inode, prev_index,
                                prev_block, len, range.flags);
out:
        filemap_invalidate_unlock(mapping);
        f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
err:
        inode_unlock(inode);
        file_end_write(filp);

        return ret;
}

static int f2fs_ioc_get_compress_option(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_comp_option option;

        if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
                return -EOPNOTSUPP;

        inode_lock_shared(inode);

        if (!f2fs_compressed_file(inode)) {
                inode_unlock_shared(inode);
                return -ENODATA;
        }

        option.algorithm = F2FS_I(inode)->i_compress_algorithm;
        option.log_cluster_size = F2FS_I(inode)->i_log_cluster_size;

        inode_unlock_shared(inode);

        if (copy_to_user((struct f2fs_comp_option __user *)arg, &option,
                                sizeof(option)))
                return -EFAULT;

        return 0;
}

static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_comp_option option;
        int ret = 0;

        if (!f2fs_sb_has_compression(sbi))
                return -EOPNOTSUPP;

        if (!(filp->f_mode & FMODE_WRITE))
                return -EBADF;

        if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
                                sizeof(option)))
                return -EFAULT;

        if (!f2fs_compressed_file(inode) ||
                        option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
                        option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
                        option.algorithm >= COMPRESS_MAX)
                return -EINVAL;

        file_start_write(filp);
        inode_lock(inode);

        if (f2fs_is_mmap_file(inode) || get_dirty_pages(inode)) {
                ret = -EBUSY;
                goto out;
        }

        if (inode->i_size != 0) {
                ret = -EFBIG;
                goto out;
        }

        F2FS_I(inode)->i_compress_algorithm = option.algorithm;
        F2FS_I(inode)->i_log_cluster_size = option.log_cluster_size;
        F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;
        f2fs_mark_inode_dirty_sync(inode, true);

        if (!f2fs_is_compress_backend_ready(inode))
                f2fs_warn(sbi, "compression algorithm is successfully set, "
                        "but current kernel doesn't support this algorithm.");
out:
        inode_unlock(inode);
        file_end_write(filp);

        return ret;
}

static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len)
{
        DEFINE_READAHEAD(ractl, NULL, NULL, inode->i_mapping, page_idx);
        struct address_space *mapping = inode->i_mapping;
        struct page *page;
        pgoff_t redirty_idx = page_idx;
        int i, page_len = 0, ret = 0;

        page_cache_ra_unbounded(&ractl, len, 0);

        for (i = 0; i < len; i++, page_idx++) {
                page = read_cache_page(mapping, page_idx, NULL, NULL);
                if (IS_ERR(page)) {
                        ret = PTR_ERR(page);
                        break;
                }
                page_len++;
        }

        for (i = 0; i < page_len; i++, redirty_idx++) {
                page = find_lock_page(mapping, redirty_idx);

                /* It will never fail, when page has pinned above */
                f2fs_bug_on(F2FS_I_SB(inode), !page);

                set_page_dirty(page);
                f2fs_put_page(page, 1);
                f2fs_put_page(page, 0);
        }

        return ret;
}

static int f2fs_ioc_decompress_file(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        pgoff_t page_idx = 0, last_idx;
        unsigned int blk_per_seg = sbi->blocks_per_seg;
        int cluster_size = fi->i_cluster_size;
        int count, ret;

        if (!f2fs_sb_has_compression(sbi) ||
                        F2FS_OPTION(sbi).compress_mode != COMPR_MODE_USER)
                return -EOPNOTSUPP;

        if (!(filp->f_mode & FMODE_WRITE))
                return -EBADF;

        if (!f2fs_compressed_file(inode))
                return -EINVAL;

        f2fs_balance_fs(F2FS_I_SB(inode), true);

        file_start_write(filp);
        inode_lock(inode);

        if (!f2fs_is_compress_backend_ready(inode)) {
                ret = -EOPNOTSUPP;
                goto out;
        }

        if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto out;
        }

        ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
        if (ret)
                goto out;

        if (!atomic_read(&fi->i_compr_blocks))
                goto out;

        last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);

        count = last_idx - page_idx;
        while (count) {
                int len = min(cluster_size, count);

                ret = redirty_blocks(inode, page_idx, len);
                if (ret < 0)
                        break;

                if (get_dirty_pages(inode) >= blk_per_seg)
                        filemap_fdatawrite(inode->i_mapping);

                count -= len;
                page_idx += len;
        }

        if (!ret)
                ret = filemap_write_and_wait_range(inode->i_mapping, 0,
                                                        LLONG_MAX);

        if (ret)
                f2fs_warn(sbi, "%s: The file might be partially decompressed (errno=%d). Please delete the file.",
                          __func__, ret);
out:
        inode_unlock(inode);
        file_end_write(filp);

        return ret;
}

static int f2fs_ioc_compress_file(struct file *filp, unsigned long arg)
{
        struct inode *inode = file_inode(filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        pgoff_t page_idx = 0, last_idx;
        unsigned int blk_per_seg = sbi->blocks_per_seg;
        int cluster_size = F2FS_I(inode)->i_cluster_size;
        int count, ret;

        if (!f2fs_sb_has_compression(sbi) ||
                        F2FS_OPTION(sbi).compress_mode != COMPR_MODE_USER)
                return -EOPNOTSUPP;

        if (!(filp->f_mode & FMODE_WRITE))
                return -EBADF;

        if (!f2fs_compressed_file(inode))
                return -EINVAL;

        f2fs_balance_fs(F2FS_I_SB(inode), true);

        file_start_write(filp);
        inode_lock(inode);

        if (!f2fs_is_compress_backend_ready(inode)) {
                ret = -EOPNOTSUPP;
                goto out;
        }

        if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto out;
        }

        ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
        if (ret)
                goto out;

        set_inode_flag(inode, FI_ENABLE_COMPRESS);

        last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);

        count = last_idx - page_idx;
        while (count) {
                int len = min(cluster_size, count);

                ret = redirty_blocks(inode, page_idx, len);
                if (ret < 0)
                        break;

                if (get_dirty_pages(inode) >= blk_per_seg)
                        filemap_fdatawrite(inode->i_mapping);

                count -= len;
                page_idx += len;
        }

        if (!ret)
                ret = filemap_write_and_wait_range(inode->i_mapping, 0,
                                                        LLONG_MAX);

        clear_inode_flag(inode, FI_ENABLE_COMPRESS);

        if (ret)
                f2fs_warn(sbi, "%s: The file might be partially compressed (errno=%d). Please delete the file.",
                          __func__, ret);
out:
        inode_unlock(inode);
        file_end_write(filp);

        return ret;
}

static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        switch (cmd) {
        case FS_IOC_GETVERSION:
                return f2fs_ioc_getversion(filp, arg);
        case F2FS_IOC_START_ATOMIC_WRITE:
                return f2fs_ioc_start_atomic_write(filp, false);
        case F2FS_IOC_START_ATOMIC_REPLACE:
                return f2fs_ioc_start_atomic_write(filp, true);
        case F2FS_IOC_COMMIT_ATOMIC_WRITE:
                return f2fs_ioc_commit_atomic_write(filp);
        case F2FS_IOC_ABORT_ATOMIC_WRITE:
                return f2fs_ioc_abort_atomic_write(filp);
        case F2FS_IOC_START_VOLATILE_WRITE:
        case F2FS_IOC_RELEASE_VOLATILE_WRITE:
                return -EOPNOTSUPP;
        case F2FS_IOC_SHUTDOWN:
                return f2fs_ioc_shutdown(filp, arg);
        case FITRIM:
                return f2fs_ioc_fitrim(filp, arg);
        case FS_IOC_SET_ENCRYPTION_POLICY:
                return f2fs_ioc_set_encryption_policy(filp, arg);
        case FS_IOC_GET_ENCRYPTION_POLICY:
                return f2fs_ioc_get_encryption_policy(filp, arg);
        case FS_IOC_GET_ENCRYPTION_PWSALT:
                return f2fs_ioc_get_encryption_pwsalt(filp, arg);
        case FS_IOC_GET_ENCRYPTION_POLICY_EX:
                return f2fs_ioc_get_encryption_policy_ex(filp, arg);
        case FS_IOC_ADD_ENCRYPTION_KEY:
                return f2fs_ioc_add_encryption_key(filp, arg);
        case FS_IOC_REMOVE_ENCRYPTION_KEY:
                return f2fs_ioc_remove_encryption_key(filp, arg);
        case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
                return f2fs_ioc_remove_encryption_key_all_users(filp, arg);
        case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
                return f2fs_ioc_get_encryption_key_status(filp, arg);
        case FS_IOC_GET_ENCRYPTION_NONCE:
                return f2fs_ioc_get_encryption_nonce(filp, arg);
        case F2FS_IOC_GARBAGE_COLLECT:
                return f2fs_ioc_gc(filp, arg);
        case F2FS_IOC_GARBAGE_COLLECT_RANGE:
                return f2fs_ioc_gc_range(filp, arg);
        case F2FS_IOC_WRITE_CHECKPOINT:
                return f2fs_ioc_write_checkpoint(filp, arg);
        case F2FS_IOC_DEFRAGMENT:
                return f2fs_ioc_defragment(filp, arg);
        case F2FS_IOC_MOVE_RANGE:
                return f2fs_ioc_move_range(filp, arg);
        case F2FS_IOC_FLUSH_DEVICE:
                return f2fs_ioc_flush_device(filp, arg);
        case F2FS_IOC_GET_FEATURES:
                return f2fs_ioc_get_features(filp, arg);
        case F2FS_IOC_GET_PIN_FILE:
                return f2fs_ioc_get_pin_file(filp, arg);
        case F2FS_IOC_SET_PIN_FILE:
                return f2fs_ioc_set_pin_file(filp, arg);
        case F2FS_IOC_PRECACHE_EXTENTS:
                return f2fs_ioc_precache_extents(filp, arg);
        case F2FS_IOC_RESIZE_FS:
                return f2fs_ioc_resize_fs(filp, arg);
        case FS_IOC_ENABLE_VERITY:
                return f2fs_ioc_enable_verity(filp, arg);
        case FS_IOC_MEASURE_VERITY:
                return f2fs_ioc_measure_verity(filp, arg);
        case FS_IOC_READ_VERITY_METADATA:
                return f2fs_ioc_read_verity_metadata(filp, arg);
        case FS_IOC_GETFSLABEL:
                return f2fs_ioc_getfslabel(filp, arg);
        case FS_IOC_SETFSLABEL:
                return f2fs_ioc_setfslabel(filp, arg);
        case F2FS_IOC_GET_COMPRESS_BLOCKS:
                return f2fs_get_compress_blocks(filp, arg);
        case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
                return f2fs_release_compress_blocks(filp, arg);
        case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
                return f2fs_reserve_compress_blocks(filp, arg);
        case F2FS_IOC_SEC_TRIM_FILE:
                return f2fs_sec_trim_file(filp, arg);
        case F2FS_IOC_GET_COMPRESS_OPTION:
                return f2fs_ioc_get_compress_option(filp, arg);
        case F2FS_IOC_SET_COMPRESS_OPTION:
                return f2fs_ioc_set_compress_option(filp, arg);
        case F2FS_IOC_DECOMPRESS_FILE:
                return f2fs_ioc_decompress_file(filp, arg);
        case F2FS_IOC_COMPRESS_FILE:
                return f2fs_ioc_compress_file(filp, arg);
        default:
                return -ENOTTY;
        }
}

long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
                return -EIO;
        if (!f2fs_is_checkpoint_ready(F2FS_I_SB(file_inode(filp))))
                return -ENOSPC;

        return __f2fs_ioctl(filp, cmd, arg);
}

/*
 * Return %true if the given read or write request should use direct I/O, or
 * %false if it should use buffered I/O.
 */
static bool f2fs_should_use_dio(struct inode *inode, struct kiocb *iocb,
                                struct iov_iter *iter)
{
        unsigned int align;

        if (!(iocb->ki_flags & IOCB_DIRECT))
                return false;

        if (f2fs_force_buffered_io(inode, iov_iter_rw(iter)))
                return false;

        /*
         * Direct I/O not aligned to the disk's logical_block_size will be
         * attempted, but will fail with -EINVAL.
         *
         * f2fs additionally requires that direct I/O be aligned to the
         * filesystem block size, which is often a stricter requirement.
         * However, f2fs traditionally falls back to buffered I/O on requests
         * that are logical_block_size-aligned but not fs-block aligned.
         *
         * The below logic implements this behavior.
         */
        align = iocb->ki_pos | iov_iter_alignment(iter);
        if (!IS_ALIGNED(align, i_blocksize(inode)) &&
            IS_ALIGNED(align, bdev_logical_block_size(inode->i_sb->s_bdev)))
                return false;

        return true;
}

static int f2fs_dio_read_end_io(struct kiocb *iocb, ssize_t size, int error,
                                unsigned int flags)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(iocb->ki_filp));

        dec_page_count(sbi, F2FS_DIO_READ);
        if (error)
                return error;
        f2fs_update_iostat(sbi, NULL, APP_DIRECT_READ_IO, size);
        return 0;
}

static const struct iomap_dio_ops f2fs_iomap_dio_read_ops = {
        .end_io = f2fs_dio_read_end_io,
};

static ssize_t f2fs_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        const loff_t pos = iocb->ki_pos;
        const size_t count = iov_iter_count(to);
        struct iomap_dio *dio;
        ssize_t ret;

        if (count == 0)
                return 0; /* skip atime update */

        trace_f2fs_direct_IO_enter(inode, iocb, count, READ);

        if (iocb->ki_flags & IOCB_NOWAIT) {
                if (!f2fs_down_read_trylock(&fi->i_gc_rwsem[READ])) {
                        ret = -EAGAIN;
                        goto out;
                }
        } else {
                f2fs_down_read(&fi->i_gc_rwsem[READ]);
        }

        /*
         * We have to use __iomap_dio_rw() and iomap_dio_complete() instead of
         * the higher-level function iomap_dio_rw() in order to ensure that the
         * F2FS_DIO_READ counter will be decremented correctly in all cases.
         */
        inc_page_count(sbi, F2FS_DIO_READ);
        dio = __iomap_dio_rw(iocb, to, &f2fs_iomap_ops,
                             &f2fs_iomap_dio_read_ops, 0, NULL, 0);
        if (IS_ERR_OR_NULL(dio)) {
                ret = PTR_ERR_OR_ZERO(dio);
                if (ret != -EIOCBQUEUED)
                        dec_page_count(sbi, F2FS_DIO_READ);
        } else {
                ret = iomap_dio_complete(dio);
        }

        f2fs_up_read(&fi->i_gc_rwsem[READ]);

        file_accessed(file);
out:
        trace_f2fs_direct_IO_exit(inode, pos, count, READ, ret);
        return ret;
}

static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
        struct inode *inode = file_inode(iocb->ki_filp);
        const loff_t pos = iocb->ki_pos;
        ssize_t ret;

        if (!f2fs_is_compress_backend_ready(inode))
                return -EOPNOTSUPP;

        if (trace_f2fs_dataread_start_enabled()) {
                char *p = f2fs_kmalloc(F2FS_I_SB(inode), PATH_MAX, GFP_KERNEL);
                char *path;

                if (!p)
                        goto skip_read_trace;

                path = dentry_path_raw(file_dentry(iocb->ki_filp), p, PATH_MAX);
                if (IS_ERR(path)) {
                        kfree(p);
                        goto skip_read_trace;
                }

                trace_f2fs_dataread_start(inode, pos, iov_iter_count(to),
                                        current->pid, path, current->comm);
                kfree(p);
        }
skip_read_trace:
        if (f2fs_should_use_dio(inode, iocb, to)) {
                ret = f2fs_dio_read_iter(iocb, to);
        } else {
                ret = filemap_read(iocb, to, 0);
                if (ret > 0)
                        f2fs_update_iostat(F2FS_I_SB(inode), inode,
                                                APP_BUFFERED_READ_IO, ret);
        }
        if (trace_f2fs_dataread_end_enabled())
                trace_f2fs_dataread_end(inode, pos, ret);
        return ret;
}

static ssize_t f2fs_write_checks(struct kiocb *iocb, struct iov_iter *from)
{
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
        ssize_t count;
        int err;

        if (IS_IMMUTABLE(inode))
                return -EPERM;

        if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
                return -EPERM;

        count = generic_write_checks(iocb, from);
        if (count <= 0)
                return count;

        err = file_modified(file);
        if (err)
                return err;
        return count;
}

/*
 * Preallocate blocks for a write request, if it is possible and helpful to do
 * so.  Returns a positive number if blocks may have been preallocated, 0 if no
 * blocks were preallocated, or a negative errno value if something went
 * seriously wrong.  Also sets FI_PREALLOCATED_ALL on the inode if *all* the
 * requested blocks (not just some of them) have been allocated.
 */
static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter,
                                   bool dio)
{
        struct inode *inode = file_inode(iocb->ki_filp);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        const loff_t pos = iocb->ki_pos;
        const size_t count = iov_iter_count(iter);
        struct f2fs_map_blocks map = {};
        int flag;
        int ret;

        /* If it will be an out-of-place direct write, don't bother. */
        if (dio && f2fs_lfs_mode(sbi))
                return 0;
        /*
         * Don't preallocate holes aligned to DIO_SKIP_HOLES which turns into
         * buffered IO, if DIO meets any holes.
         */
        if (dio && i_size_read(inode) &&
                (F2FS_BYTES_TO_BLK(pos) < F2FS_BLK_ALIGN(i_size_read(inode))))
                return 0;

        /* No-wait I/O can't allocate blocks. */
        if (iocb->ki_flags & IOCB_NOWAIT)
                return 0;

        /* If it will be a short write, don't bother. */
        if (fault_in_iov_iter_readable(iter, count))
                return 0;

        if (f2fs_has_inline_data(inode)) {
                /* If the data will fit inline, don't bother. */
                if (pos + count <= MAX_INLINE_DATA(inode))
                        return 0;
                ret = f2fs_convert_inline_inode(inode);
                if (ret)
                        return ret;
        }

        /* Do not preallocate blocks that will be written partially in 4KB. */
        map.m_lblk = F2FS_BLK_ALIGN(pos);
        map.m_len = F2FS_BYTES_TO_BLK(pos + count);
        if (map.m_len > map.m_lblk)
                map.m_len -= map.m_lblk;
        else
                map.m_len = 0;
        map.m_may_create = true;
        if (dio) {
                map.m_seg_type = f2fs_rw_hint_to_seg_type(inode->i_write_hint);
                flag = F2FS_GET_BLOCK_PRE_DIO;
        } else {
                map.m_seg_type = NO_CHECK_TYPE;
                flag = F2FS_GET_BLOCK_PRE_AIO;
        }

        ret = f2fs_map_blocks(inode, &map, 1, flag);
        /* -ENOSPC|-EDQUOT are fine to report the number of allocated blocks. */
        if (ret < 0 && !((ret == -ENOSPC || ret == -EDQUOT) && map.m_len > 0))
                return ret;
        if (ret == 0)
                set_inode_flag(inode, FI_PREALLOCATED_ALL);
        return map.m_len;
}

static ssize_t f2fs_buffered_write_iter(struct kiocb *iocb,
                                        struct iov_iter *from)
{
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
        ssize_t ret;

        if (iocb->ki_flags & IOCB_NOWAIT)
                return -EOPNOTSUPP;

        current->backing_dev_info = inode_to_bdi(inode);
        ret = generic_perform_write(iocb, from);
        current->backing_dev_info = NULL;

        if (ret > 0) {
                iocb->ki_pos += ret;
                f2fs_update_iostat(F2FS_I_SB(inode), inode,
                                                APP_BUFFERED_IO, ret);
        }
        return ret;
}

static int f2fs_dio_write_end_io(struct kiocb *iocb, ssize_t size, int error,
                                 unsigned int flags)
{
        struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(iocb->ki_filp));

        dec_page_count(sbi, F2FS_DIO_WRITE);
        if (error)
                return error;
        f2fs_update_iostat(sbi, NULL, APP_DIRECT_IO, size);
        return 0;
}

static const struct iomap_dio_ops f2fs_iomap_dio_write_ops = {
        .end_io = f2fs_dio_write_end_io,
};

static ssize_t f2fs_dio_write_iter(struct kiocb *iocb, struct iov_iter *from,
                                   bool *may_need_sync)
{
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
        struct f2fs_inode_info *fi = F2FS_I(inode);
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        const bool do_opu = f2fs_lfs_mode(sbi);
        const loff_t pos = iocb->ki_pos;
        const ssize_t count = iov_iter_count(from);
        unsigned int dio_flags;
        struct iomap_dio *dio;
        ssize_t ret;

        trace_f2fs_direct_IO_enter(inode, iocb, count, WRITE);

        if (iocb->ki_flags & IOCB_NOWAIT) {
                /* f2fs_convert_inline_inode() and block allocation can block */
                if (f2fs_has_inline_data(inode) ||
                    !f2fs_overwrite_io(inode, pos, count)) {
                        ret = -EAGAIN;
                        goto out;
                }

                if (!f2fs_down_read_trylock(&fi->i_gc_rwsem[WRITE])) {
                        ret = -EAGAIN;
                        goto out;
                }
                if (do_opu && !f2fs_down_read_trylock(&fi->i_gc_rwsem[READ])) {
                        f2fs_up_read(&fi->i_gc_rwsem[WRITE]);
                        ret = -EAGAIN;
                        goto out;
                }
        } else {
                ret = f2fs_convert_inline_inode(inode);
                if (ret)
                        goto out;

                f2fs_down_read(&fi->i_gc_rwsem[WRITE]);
                if (do_opu)
                        f2fs_down_read(&fi->i_gc_rwsem[READ]);
        }

        /*
         * We have to use __iomap_dio_rw() and iomap_dio_complete() instead of
         * the higher-level function iomap_dio_rw() in order to ensure that the
         * F2FS_DIO_WRITE counter will be decremented correctly in all cases.
         */
        inc_page_count(sbi, F2FS_DIO_WRITE);
        dio_flags = 0;
        if (pos + count > inode->i_size)
                dio_flags |= IOMAP_DIO_FORCE_WAIT;
        dio = __iomap_dio_rw(iocb, from, &f2fs_iomap_ops,
                             &f2fs_iomap_dio_write_ops, dio_flags, NULL, 0);
        if (IS_ERR_OR_NULL(dio)) {
                ret = PTR_ERR_OR_ZERO(dio);
                if (ret == -ENOTBLK)
                        ret = 0;
                if (ret != -EIOCBQUEUED)
                        dec_page_count(sbi, F2FS_DIO_WRITE);
        } else {
                ret = iomap_dio_complete(dio);
        }

        if (do_opu)
                f2fs_up_read(&fi->i_gc_rwsem[READ]);
        f2fs_up_read(&fi->i_gc_rwsem[WRITE]);

        if (ret < 0)
                goto out;
        if (pos + ret > inode->i_size)
                f2fs_i_size_write(inode, pos + ret);
        if (!do_opu)
                set_inode_flag(inode, FI_UPDATE_WRITE);

        if (iov_iter_count(from)) {
                ssize_t ret2;
                loff_t bufio_start_pos = iocb->ki_pos;

                /*
                 * The direct write was partial, so we need to fall back to a
                 * buffered write for the remainder.
                 */

                ret2 = f2fs_buffered_write_iter(iocb, from);
                if (iov_iter_count(from))
                        f2fs_write_failed(inode, iocb->ki_pos);
                if (ret2 < 0)
                        goto out;

                /*
                 * Ensure that the pagecache pages are written to disk and
                 * invalidated to preserve the expected O_DIRECT semantics.
                 */
                if (ret2 > 0) {
                        loff_t bufio_end_pos = bufio_start_pos + ret2 - 1;

                        ret += ret2;

                        ret2 = filemap_write_and_wait_range(file->f_mapping,
                                                            bufio_start_pos,
                                                            bufio_end_pos);
                        if (ret2 < 0)
                                goto out;
                        invalidate_mapping_pages(file->f_mapping,
                                                 bufio_start_pos >> PAGE_SHIFT,
                                                 bufio_end_pos >> PAGE_SHIFT);
                }
        } else {
                /* iomap_dio_rw() already handled the generic_write_sync(). */
                *may_need_sync = false;
        }
out:
        trace_f2fs_direct_IO_exit(inode, pos, count, WRITE, ret);
        return ret;
}

static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
        struct inode *inode = file_inode(iocb->ki_filp);
        const loff_t orig_pos = iocb->ki_pos;
        const size_t orig_count = iov_iter_count(from);
        loff_t target_size;
        bool dio;
        bool may_need_sync = true;
        int preallocated;
        ssize_t ret;

        if (unlikely(f2fs_cp_error(F2FS_I_SB(inode)))) {
                ret = -EIO;
                goto out;
        }

        if (!f2fs_is_compress_backend_ready(inode)) {
                ret = -EOPNOTSUPP;
                goto out;
        }

        if (iocb->ki_flags & IOCB_NOWAIT) {
                if (!inode_trylock(inode)) {
                        ret = -EAGAIN;
                        goto out;
                }
        } else {
                inode_lock(inode);
        }

        ret = f2fs_write_checks(iocb, from);
        if (ret <= 0)
                goto out_unlock;

        /* Determine whether we will do a direct write or a buffered write. */
        dio = f2fs_should_use_dio(inode, iocb, from);

        /* Possibly preallocate the blocks for the write. */
        target_size = iocb->ki_pos + iov_iter_count(from);
        preallocated = f2fs_preallocate_blocks(iocb, from, dio);
        if (preallocated < 0) {
                ret = preallocated;
        } else {
                if (trace_f2fs_datawrite_start_enabled()) {
                        char *p = f2fs_kmalloc(F2FS_I_SB(inode),
                                                PATH_MAX, GFP_KERNEL);
                        char *path;

                        if (!p)
                                goto skip_write_trace;
                        path = dentry_path_raw(file_dentry(iocb->ki_filp),
                                                                p, PATH_MAX);
                        if (IS_ERR(path)) {
                                kfree(p);
                                goto skip_write_trace;
                        }
                        trace_f2fs_datawrite_start(inode, orig_pos, orig_count,
                                        current->pid, path, current->comm);
                        kfree(p);
                }
skip_write_trace:
                /* Do the actual write. */
                ret = dio ?
                        f2fs_dio_write_iter(iocb, from, &may_need_sync) :
                        f2fs_buffered_write_iter(iocb, from);

                if (trace_f2fs_datawrite_end_enabled())
                        trace_f2fs_datawrite_end(inode, orig_pos, ret);
        }

        /* Don't leave any preallocated blocks around past i_size. */
        if (preallocated && i_size_read(inode) < target_size) {
                f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
                filemap_invalidate_lock(inode->i_mapping);
                if (!f2fs_truncate(inode))
                        file_dont_truncate(inode);
                filemap_invalidate_unlock(inode->i_mapping);
                f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
        } else {
                file_dont_truncate(inode);
        }

        clear_inode_flag(inode, FI_PREALLOCATED_ALL);
out_unlock:
        inode_unlock(inode);
out:
        trace_f2fs_file_write_iter(inode, orig_pos, orig_count, ret);
        if (ret > 0 && may_need_sync)
                ret = generic_write_sync(iocb, ret);
        return ret;
}

static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,
                int advice)
{
        struct address_space *mapping;
        struct backing_dev_info *bdi;
        struct inode *inode = file_inode(filp);
        int err;

        if (advice == POSIX_FADV_SEQUENTIAL) {
                if (S_ISFIFO(inode->i_mode))
                        return -ESPIPE;

                mapping = filp->f_mapping;
                if (!mapping || len < 0)
                        return -EINVAL;

                bdi = inode_to_bdi(mapping->host);
                filp->f_ra.ra_pages = bdi->ra_pages *
                        F2FS_I_SB(inode)->seq_file_ra_mul;
                spin_lock(&filp->f_lock);
                filp->f_mode &= ~FMODE_RANDOM;
                spin_unlock(&filp->f_lock);
                return 0;
        }

        err = generic_fadvise(filp, offset, len, advice);
        if (!err && advice == POSIX_FADV_DONTNEED &&
                test_opt(F2FS_I_SB(inode), COMPRESS_CACHE) &&
                f2fs_compressed_file(inode))
                f2fs_invalidate_compress_pages(F2FS_I_SB(inode), inode->i_ino);

        return err;
}

#ifdef CONFIG_COMPAT
struct compat_f2fs_gc_range {
        u32 sync;
        compat_u64 start;
        compat_u64 len;
};
#define F2FS_IOC32_GARBAGE_COLLECT_RANGE        _IOW(F2FS_IOCTL_MAGIC, 11,\
                                                struct compat_f2fs_gc_range)

static int f2fs_compat_ioc_gc_range(struct file *file, unsigned long arg)
{
        struct compat_f2fs_gc_range __user *urange;
        struct f2fs_gc_range range;
        int err;

        urange = compat_ptr(arg);
        err = get_user(range.sync, &urange->sync);
        err |= get_user(range.start, &urange->start);
        err |= get_user(range.len, &urange->len);
        if (err)
                return -EFAULT;

        return __f2fs_ioc_gc_range(file, &range);
}

struct compat_f2fs_move_range {
        u32 dst_fd;
        compat_u64 pos_in;
        compat_u64 pos_out;
        compat_u64 len;
};
#define F2FS_IOC32_MOVE_RANGE           _IOWR(F2FS_IOCTL_MAGIC, 9,      \
                                        struct compat_f2fs_move_range)

static int f2fs_compat_ioc_move_range(struct file *file, unsigned long arg)
{
        struct compat_f2fs_move_range __user *urange;
        struct f2fs_move_range range;
        int err;

        urange = compat_ptr(arg);
        err = get_user(range.dst_fd, &urange->dst_fd);
        err |= get_user(range.pos_in, &urange->pos_in);
        err |= get_user(range.pos_out, &urange->pos_out);
        err |= get_user(range.len, &urange->len);
        if (err)
                return -EFAULT;

        return __f2fs_ioc_move_range(file, &range);
}

long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
        if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(file)))))
                return -EIO;
        if (!f2fs_is_checkpoint_ready(F2FS_I_SB(file_inode(file))))
                return -ENOSPC;

        switch (cmd) {
        case FS_IOC32_GETVERSION:
                cmd = FS_IOC_GETVERSION;
                break;
        case F2FS_IOC32_GARBAGE_COLLECT_RANGE:
                return f2fs_compat_ioc_gc_range(file, arg);
        case F2FS_IOC32_MOVE_RANGE:
                return f2fs_compat_ioc_move_range(file, arg);
        case F2FS_IOC_START_ATOMIC_WRITE:
        case F2FS_IOC_COMMIT_ATOMIC_WRITE:
        case F2FS_IOC_START_VOLATILE_WRITE:
        case F2FS_IOC_RELEASE_VOLATILE_WRITE:
        case F2FS_IOC_ABORT_ATOMIC_WRITE:
        case F2FS_IOC_SHUTDOWN:
        case FITRIM:
        case FS_IOC_SET_ENCRYPTION_POLICY:
        case FS_IOC_GET_ENCRYPTION_PWSALT:
        case FS_IOC_GET_ENCRYPTION_POLICY:
        case FS_IOC_GET_ENCRYPTION_POLICY_EX:
        case FS_IOC_ADD_ENCRYPTION_KEY:
        case FS_IOC_REMOVE_ENCRYPTION_KEY:
        case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
        case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
        case FS_IOC_GET_ENCRYPTION_NONCE:
        case F2FS_IOC_GARBAGE_COLLECT:
        case F2FS_IOC_WRITE_CHECKPOINT:
        case F2FS_IOC_DEFRAGMENT:
        case F2FS_IOC_FLUSH_DEVICE:
        case F2FS_IOC_GET_FEATURES:
        case F2FS_IOC_GET_PIN_FILE:
        case F2FS_IOC_SET_PIN_FILE:
        case F2FS_IOC_PRECACHE_EXTENTS:
        case F2FS_IOC_RESIZE_FS:
        case FS_IOC_ENABLE_VERITY:
        case FS_IOC_MEASURE_VERITY:
        case FS_IOC_READ_VERITY_METADATA:
        case FS_IOC_GETFSLABEL:
        case FS_IOC_SETFSLABEL:
        case F2FS_IOC_GET_COMPRESS_BLOCKS:
        case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
        case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
        case F2FS_IOC_SEC_TRIM_FILE:
        case F2FS_IOC_GET_COMPRESS_OPTION:
        case F2FS_IOC_SET_COMPRESS_OPTION:
        case F2FS_IOC_DECOMPRESS_FILE:
        case F2FS_IOC_COMPRESS_FILE:
                break;
        default:
                return -ENOIOCTLCMD;
        }
        return __f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif

const struct file_operations f2fs_file_operations = {
        .llseek         = f2fs_llseek,
        .read_iter      = f2fs_file_read_iter,
        .write_iter     = f2fs_file_write_iter,
        .open           = f2fs_file_open,
        .release        = f2fs_release_file,
        .mmap           = f2fs_file_mmap,
        .flush          = f2fs_file_flush,
        .fsync          = f2fs_sync_file,
        .fallocate      = f2fs_fallocate,
        .unlocked_ioctl = f2fs_ioctl,
#ifdef CONFIG_COMPAT
        .compat_ioctl   = f2fs_compat_ioctl,
#endif
        .splice_read    = generic_file_splice_read,
        .splice_write   = iter_file_splice_write,
        .fadvise        = f2fs_file_fadvise,
};