[people/ms/linux.git] / fs / nfs / nfs4file.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/nfs/file.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 */
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/mount.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_ssc.h>
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "fscache.h"
#include "pnfs.h"

#include "nfstrace.h"

#ifdef CONFIG_NFS_V4_2
#include "nfs42.h"
#endif

#define NFSDBG_FACILITY		NFSDBG_FILE

static int
nfs4_file_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;
	struct dentry *dentry = file_dentry(filp);
	struct dentry *parent = NULL;
	struct inode *dir;
	unsigned openflags = filp->f_flags;
	fmode_t f_mode;
	struct iattr attr;
	int err;

	/*
	 * If no cached dentry exists or if it's negative, NFSv4 handled the
	 * opens in ->lookup() or ->create().
	 *
	 * We only get this far for a cached positive dentry.  We skipped
	 * revalidation, so handle it here by dropping the dentry and returning
	 * -EOPENSTALE.  The VFS will retry the lookup/create/open.
	 */

	dprintk("NFS: open file(%pd2)\n", dentry);

	err = nfs_check_flags(openflags);
	if (err)
		return err;

	f_mode = filp->f_mode;
	if ((openflags & O_ACCMODE) == 3)
		f_mode |= flags_to_mode(openflags);

	/* We can't create new files here */
	openflags &= ~(O_CREAT|O_EXCL);

	parent = dget_parent(dentry);
	dir = d_inode(parent);

	ctx = alloc_nfs_open_context(file_dentry(filp), f_mode, filp);
	err = PTR_ERR(ctx);
	if (IS_ERR(ctx))
		goto out;

	attr.ia_valid = ATTR_OPEN;
	if (openflags & O_TRUNC) {
		attr.ia_valid |= ATTR_SIZE;
		attr.ia_size = 0;
		filemap_write_and_wait(inode->i_mapping);
	}

	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		switch (err) {
		default:
			goto out_put_ctx;
		case -ENOENT:
		case -ESTALE:
		case -EISDIR:
		case -ENOTDIR:
		case -ELOOP:
			goto out_drop;
		}
	}
	if (inode != d_inode(dentry))
		goto out_drop;

	nfs_file_set_open_context(filp, ctx);
	nfs_fscache_open_file(inode, filp);
	err = 0;
	filp->f_mode |= FMODE_CAN_ODIRECT;

out_put_ctx:
	put_nfs_open_context(ctx);
out:
	dput(parent);
	return err;

out_drop:
	d_drop(dentry);
	err = -EOPENSTALE;
	goto out_put_ctx;
}

/*
 * Flush all dirty pages, and check for write errors.
 */
static int
nfs4_file_flush(struct file *file, fl_owner_t id)
{
	struct inode	*inode = file_inode(file);
	errseq_t since;

	dprintk("NFS: flush(%pD2)\n", file);

	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
	if ((file->f_mode & FMODE_WRITE) == 0)
		return 0;

	/*
	 * If we're holding a write delegation, then check if we're required
	 * to flush the i/o on close. If not, then just start the i/o now.
	 */
	if (!nfs4_delegation_flush_on_close(inode))
		return filemap_fdatawrite(file->f_mapping);

	/* Flush writes to the server and return any errors */
	since = filemap_sample_wb_err(file->f_mapping);
	nfs_wb_all(inode);
	return filemap_check_wb_err(file->f_mapping, since);
}

#ifdef CONFIG_NFS_V4_2
static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
				      struct file *file_out, loff_t pos_out,
				      size_t count, unsigned int flags)
{
	struct nfs42_copy_notify_res *cn_resp = NULL;
	struct nl4_server *nss = NULL;
	nfs4_stateid *cnrs = NULL;
	ssize_t ret;
	bool sync = false;

	/* Only offload copy if superblock is the same */
	if (file_in->f_op != &nfs4_file_operations)
		return -EXDEV;
	if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY) ||
	    !nfs_server_capable(file_inode(file_in), NFS_CAP_COPY))
		return -EOPNOTSUPP;
	if (file_inode(file_in) == file_inode(file_out))
		return -EOPNOTSUPP;
	/* if the copy size if smaller than 2 RPC payloads, make it
	 * synchronous
	 */
	if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
		sync = true;
retry:
	if (!nfs42_files_from_same_server(file_in, file_out)) {
		/*
		 * for inter copy, if copy size is too small
		 * then fallback to generic copy.
		 */
		if (sync)
			return -EOPNOTSUPP;
		cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
				  GFP_KERNEL);
		if (unlikely(cn_resp == NULL))
			return -ENOMEM;

		ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
		if (ret) {
			ret = -EOPNOTSUPP;
			goto out;
		}
		nss = &cn_resp->cnr_src;
		cnrs = &cn_resp->cnr_stateid;
	}
	ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
				nss, cnrs, sync);
out:
	kfree(cn_resp);

	if (ret == -EAGAIN)
		goto retry;
	return ret;
}

static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
				    struct file *file_out, loff_t pos_out,
				    size_t count, unsigned int flags)
{
	ssize_t ret;

	ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
				     flags);
	if (ret == -EOPNOTSUPP || ret == -EXDEV)
		ret = generic_copy_file_range(file_in, pos_in, file_out,
					      pos_out, count, flags);
	return ret;
}

static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
{
	loff_t ret;

	switch (whence) {
	case SEEK_HOLE:
	case SEEK_DATA:
		ret = nfs42_proc_llseek(filep, offset, whence);
		if (ret != -EOPNOTSUPP)
			return ret;
		fallthrough;
	default:
		return nfs_file_llseek(filep, offset, whence);
	}
}

static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(filep);
	long ret;

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

	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
		return -EOPNOTSUPP;

	ret = inode_newsize_ok(inode, offset + len);
	if (ret < 0)
		return ret;

	if (mode & FALLOC_FL_PUNCH_HOLE)
		return nfs42_proc_deallocate(filep, offset, len);
	return nfs42_proc_allocate(filep, offset, len);
}

static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
		struct file *dst_file, loff_t dst_off, loff_t count,
		unsigned int remap_flags)
{
	struct inode *dst_inode = file_inode(dst_file);
	struct nfs_server *server = NFS_SERVER(dst_inode);
	struct inode *src_inode = file_inode(src_file);
	unsigned int bs = server->clone_blksize;
	bool same_inode = false;
	int ret;

	/* NFS does not support deduplication. */
	if (remap_flags & REMAP_FILE_DEDUP)
		return -EOPNOTSUPP;

	if (remap_flags & ~REMAP_FILE_ADVISORY)
		return -EINVAL;

	if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode))
		return -ETXTBSY;

	/* check alignment w.r.t. clone_blksize */
	ret = -EINVAL;
	if (bs) {
		if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
			goto out;
		if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
			goto out;
	}

	if (src_inode == dst_inode)
		same_inode = true;

	/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
	if (same_inode) {
		inode_lock(src_inode);
	} else if (dst_inode < src_inode) {
		inode_lock_nested(dst_inode, I_MUTEX_PARENT);
		inode_lock_nested(src_inode, I_MUTEX_CHILD);
	} else {
		inode_lock_nested(src_inode, I_MUTEX_PARENT);
		inode_lock_nested(dst_inode, I_MUTEX_CHILD);
	}

	/* flush all pending writes on both src and dst so that server
	 * has the latest data */
	ret = nfs_sync_inode(src_inode);
	if (ret)
		goto out_unlock;
	ret = nfs_sync_inode(dst_inode);
	if (ret)
		goto out_unlock;

	ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);

	/* truncate inode page cache of the dst range so that future reads can fetch
	 * new data from server */
	if (!ret)
		truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);

out_unlock:
	if (same_inode) {
		inode_unlock(src_inode);
	} else if (dst_inode < src_inode) {
		inode_unlock(src_inode);
		inode_unlock(dst_inode);
	} else {
		inode_unlock(dst_inode);
		inode_unlock(src_inode);
	}
out:
	return ret < 0 ? ret : count;
}

static int read_name_gen = 1;
#define SSC_READ_NAME_BODY "ssc_read_%d"

static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
		struct nfs_fh *src_fh, nfs4_stateid *stateid)
{
	struct nfs_fattr *fattr = nfs_alloc_fattr();
	struct file *filep, *res;
	struct nfs_server *server;
	struct inode *r_ino = NULL;
	struct nfs_open_context *ctx;
	struct nfs4_state_owner *sp;
	char *read_name = NULL;
	int len, status = 0;

	server = NFS_SB(ss_mnt->mnt_sb);

	if (!fattr)
		return ERR_PTR(-ENOMEM);

	status = nfs4_proc_getattr(server, src_fh, fattr, NULL);
	if (status < 0) {
		res = ERR_PTR(status);
		goto out;
	}

	if (!S_ISREG(fattr->mode)) {
		res = ERR_PTR(-EBADF);
		goto out;
	}

	res = ERR_PTR(-ENOMEM);
	len = strlen(SSC_READ_NAME_BODY) + 16;
	read_name = kzalloc(len, GFP_KERNEL);
	if (read_name == NULL)
		goto out;
	snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);

	r_ino = nfs_fhget(ss_mnt->mnt_sb, src_fh, fattr);
	if (IS_ERR(r_ino)) {
		res = ERR_CAST(r_ino);
		goto out_free_name;
	}

	filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, O_RDONLY,
				     r_ino->i_fop);
	if (IS_ERR(filep)) {
		res = ERR_CAST(filep);
		iput(r_ino);
		goto out_free_name;
	}

	ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
					filep);
	if (IS_ERR(ctx)) {
		res = ERR_CAST(ctx);
		goto out_filep;
	}

	res = ERR_PTR(-EINVAL);
	sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
	if (sp == NULL)
		goto out_ctx;

	ctx->state = nfs4_get_open_state(r_ino, sp);
	if (ctx->state == NULL)
		goto out_stateowner;

	set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
	memcpy(&ctx->state->open_stateid.other, &stateid->other,
	       NFS4_STATEID_OTHER_SIZE);
	update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
	set_bit(NFS_OPEN_STATE, &ctx->state->flags);

	nfs_file_set_open_context(filep, ctx);
	put_nfs_open_context(ctx);

	file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
	res = filep;
out_free_name:
	kfree(read_name);
out:
	nfs_free_fattr(fattr);
	return res;
out_stateowner:
	nfs4_put_state_owner(sp);
out_ctx:
	put_nfs_open_context(ctx);
out_filep:
	fput(filep);
	goto out_free_name;
}

static void __nfs42_ssc_close(struct file *filep)
{
	struct nfs_open_context *ctx = nfs_file_open_context(filep);

	ctx->state->flags = 0;
}

static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = {
	.sco_open = __nfs42_ssc_open,
	.sco_close = __nfs42_ssc_close,
};

/**
 * nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common
 *
 * Return values:
 *   None
 */
void nfs42_ssc_register_ops(void)
{
	nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
}

/**
 * nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common
 *
 * Return values:
 *   None.
 */
void nfs42_ssc_unregister_ops(void)
{
	nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
}
#endif /* CONFIG_NFS_V4_2 */

static int nfs4_setlease(struct file *file, long arg, struct file_lock **lease,
			 void **priv)
{
	return nfs4_proc_setlease(file, arg, lease, priv);
}

const struct file_operations nfs4_file_operations = {
	.read_iter	= nfs_file_read,
	.write_iter	= nfs_file_write,
	.mmap		= nfs_file_mmap,
	.open		= nfs4_file_open,
	.flush		= nfs4_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.check_flags	= nfs_check_flags,
	.setlease	= nfs4_setlease,
#ifdef CONFIG_NFS_V4_2
	.copy_file_range = nfs4_copy_file_range,
	.llseek		= nfs4_file_llseek,
	.fallocate	= nfs42_fallocate,
	.remap_file_range = nfs42_remap_file_range,
#else
	.llseek		= nfs_file_llseek,
#endif
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
ce4ef7c0 BS	2	/*
	3	* linux/fs/nfs/file.c
	4	*
	5	* Copyright (C) 1992 Rick Sladkey
	6	*/
f4ac1674	7	#include <linux/fs.h>
bea51b30	8	#include <linux/file.h>
f4ac1674	9	#include <linux/falloc.h>
f2aedb71	10	#include <linux/mount.h>
ce4ef7c0	11	#include <linux/nfs_fs.h>
0cfcd405	12	#include <linux/nfs_ssc.h>
5445b1fb	13	#include "delegation.h"
ce4ef7c0	14	#include "internal.h"
5445b1fb	15	#include "iostat.h"
a4ff1468	16	#include "fscache.h"
ce4ef7c0 BS	17	#include "pnfs.h"
ce4ef7c0 BS	18
81b79afb TM	19	#include "nfstrace.h"
81b79afb TM	20
1c6dcbe5 AS	21	#ifdef CONFIG_NFS_V4_2
	22	#include "nfs42.h"
	23	#endif
	24
ce4ef7c0 BS	25	#define NFSDBG_FACILITY NFSDBG_FILE
	26
	27	static int
	28	nfs4_file_open(struct inode inode, struct file filp)
	29	{
	30	struct nfs_open_context *ctx;
be62a1a8	31	struct dentry *dentry = file_dentry(filp);
ce4ef7c0 BS	32	struct dentry *parent = NULL;
	33	struct inode *dir;
	34	unsigned openflags = filp->f_flags;
b243874f	35	fmode_t f_mode;
ce4ef7c0 BS	36	struct iattr attr;
	37	int err;
	38
ce4ef7c0 BS	39	/*
	40	* If no cached dentry exists or if it's negative, NFSv4 handled the
	41	* opens in ->lookup() or ->create().
	42	*
	43	* We only get this far for a cached positive dentry. We skipped
	44	* revalidation, so handle it here by dropping the dentry and returning
	45	* -EOPENSTALE. The VFS will retry the lookup/create/open.
	46	*/
	47
6de1472f	48	dprintk("NFS: open file(%pd2)\n", dentry);
ce4ef7c0	49
18a60089 BC	50	err = nfs_check_flags(openflags);
	51	if (err)
	52	return err;
	53
b243874f	54	f_mode = filp->f_mode;
ce4ef7c0	55	if ((openflags & O_ACCMODE) == 3)
b243874f	56	f_mode \|= flags_to_mode(openflags);
ce4ef7c0 BS	57
	58	/* We can't create new files here */
	59	openflags &= ~(O_CREAT\|O_EXCL);
	60
	61	parent = dget_parent(dentry);
2b0143b5	62	dir = d_inode(parent);
ce4ef7c0	63
b243874f	64	ctx = alloc_nfs_open_context(file_dentry(filp), f_mode, filp);
ce4ef7c0 BS	65	err = PTR_ERR(ctx);
	66	if (IS_ERR(ctx))
	67	goto out;
	68
	69	attr.ia_valid = ATTR_OPEN;
	70	if (openflags & O_TRUNC) {
	71	attr.ia_valid \|= ATTR_SIZE;
	72	attr.ia_size = 0;
8b7d9d09	73	filemap_write_and_wait(inode->i_mapping);
ce4ef7c0 BS	74	}
ce4ef7c0 BS	75
c5c3fb5f	76	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
ce4ef7c0 BS	77	if (IS_ERR(inode)) {
	78	err = PTR_ERR(inode);
	79	switch (err) {
ce4ef7c0	80	default:
90cf500e TM	81	goto out_put_ctx;
	82	case -ENOENT:
	83	case -ESTALE:
	84	case -EISDIR:
	85	case -ENOTDIR:
	86	case -ELOOP:
ce4ef7c0 BS	87	goto out_drop;
	88	}
	89	}
2b0143b5	90	if (inode != d_inode(dentry))
ce4ef7c0 BS	91	goto out_drop;
ce4ef7c0 BS	92
ce4ef7c0	93	nfs_file_set_open_context(filp, ctx);
f1fe29b4	94	nfs_fscache_open_file(inode, filp);
ce4ef7c0	95	err = 0;
5ee3d10f	96	filp->f_mode \|= FMODE_CAN_ODIRECT;
ce4ef7c0 BS	97
	98	out_put_ctx:
	99	put_nfs_open_context(ctx);
	100	out:
	101	dput(parent);
	102	return err;
	103
	104	out_drop:
	105	d_drop(dentry);
	106	err = -EOPENSTALE;
	107	goto out_put_ctx;
	108	}
	109
5445b1fb TM	110	/*
	111	* Flush all dirty pages, and check for write errors.
	112	*/
	113	static int
	114	nfs4_file_flush(struct file *file, fl_owner_t id)
	115	{
	116	struct inode *inode = file_inode(file);
67dd23f9	117	errseq_t since;
5445b1fb TM	118
	119	dprintk("NFS: flush(%pD2)\n", file);
	120
	121	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
	122	if ((file->f_mode & FMODE_WRITE) == 0)
	123	return 0;
	124
	125	/*
	126	* If we're holding a write delegation, then check if we're required
	127	* to flush the i/o on close. If not, then just start the i/o now.
	128	*/
	129	if (!nfs4_delegation_flush_on_close(inode))
	130	return filemap_fdatawrite(file->f_mapping);
	131
	132	/* Flush writes to the server and return any errors */
67dd23f9 SM	133	since = filemap_sample_wb_err(file->f_mapping);
	134	nfs_wb_all(inode);
	135	return filemap_check_wb_err(file->f_mapping, since);
5445b1fb TM	136	}
5445b1fb TM	137
1c6dcbe5	138	#ifdef CONFIG_NFS_V4_2
64bf5ff5 DC	139	static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
	140	struct file *file_out, loff_t pos_out,
	141	size_t count, unsigned int flags)
2e72448b	142	{
0491567b	143	struct nfs42_copy_notify_res *cn_resp = NULL;
1d38f3f0 OK	144	struct nl4_server *nss = NULL;
1d38f3f0 OK	145	nfs4_stateid *cnrs = NULL;
0491567b	146	ssize_t ret;
12751010	147	bool sync = false;
0491567b	148
5dae222a	149	/* Only offload copy if superblock is the same */
8dff1df5	150	if (file_in->f_op != &nfs4_file_operations)
5dae222a	151	return -EXDEV;
d8a6ad91 DW	152	if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY) \|\|
d8a6ad91 DW	153	!nfs_server_capable(file_inode(file_in), NFS_CAP_COPY))
0769663b	154	return -EOPNOTSUPP;
837bb1d7	155	if (file_inode(file_in) == file_inode(file_out))
0769663b	156	return -EOPNOTSUPP;
12751010 OK	157	/* if the copy size if smaller than 2 RPC payloads, make it
	158	* synchronous
	159	*/
	160	if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
	161	sync = true;
0e65a32c	162	retry:
0491567b	163	if (!nfs42_files_from_same_server(file_in, file_out)) {
ca7d1d1a DN	164	/*
	165	* for inter copy, if copy size is too small
	166	* then fallback to generic copy.
12751010	167	*/
ca7d1d1a	168	if (sync)
12751010	169	return -EOPNOTSUPP;
0491567b	170	cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
4fb547be	171	GFP_KERNEL);
0491567b OK	172	if (unlikely(cn_resp == NULL))
	173	return -ENOMEM;
	174
	175	ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
	176	if (ret) {
	177	ret = -EOPNOTSUPP;
	178	goto out;
	179	}
1d38f3f0 OK	180	nss = &cn_resp->cnr_src;
1d38f3f0 OK	181	cnrs = &cn_resp->cnr_stateid;
0491567b	182	}
1d38f3f0	183	ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
12751010	184	nss, cnrs, sync);
0491567b	185	out:
98c27f27 TR	186	kfree(cn_resp);
98c27f27 TR	187
0e65a32c OK	188	if (ret == -EAGAIN)
0e65a32c OK	189	goto retry;
0491567b	190	return ret;
2e72448b AS	191	}
2e72448b AS	192
64bf5ff5 DC	193	static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
	194	struct file *file_out, loff_t pos_out,
	195	size_t count, unsigned int flags)
	196	{
	197	ssize_t ret;
	198
	199	ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
	200	flags);
5dae222a	201	if (ret == -EOPNOTSUPP \|\| ret == -EXDEV)
64bf5ff5 DC	202	ret = generic_copy_file_range(file_in, pos_in, file_out,
	203	pos_out, count, flags);
	204	return ret;
	205	}
	206
1c6dcbe5 AS	207	static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
	208	{
	209	loff_t ret;
	210
	211	switch (whence) {
	212	case SEEK_HOLE:
	213	case SEEK_DATA:
	214	ret = nfs42_proc_llseek(filep, offset, whence);
e67afa7e	215	if (ret != -EOPNOTSUPP)
1c6dcbe5	216	return ret;
df561f66	217	fallthrough;
1c6dcbe5 AS	218	default:
	219	return nfs_file_llseek(filep, offset, whence);
	220	}
	221	}
f4ac1674 AS	222
	223	static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
	224	{
	225	struct inode *inode = file_inode(filep);
	226	long ret;
	227
	228	if (!S_ISREG(inode->i_mode))
	229	return -EOPNOTSUPP;
	230
624bd5b7	231	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE \| FALLOC_FL_KEEP_SIZE)))
f4ac1674 AS	232	return -EOPNOTSUPP;
	233
	234	ret = inode_newsize_ok(inode, offset + len);
	235	if (ret < 0)
	236	return ret;
	237
624bd5b7	238	if (mode & FALLOC_FL_PUNCH_HOLE)
f830f7dd AS	239	return nfs42_proc_deallocate(filep, offset, len);
f830f7dd AS	240	return nfs42_proc_allocate(filep, offset, len);
f4ac1674	241	}
bea51b30	242
42ec3d4c DW	243	static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
42ec3d4c DW	244	struct file *dst_file, loff_t dst_off, loff_t count,
2e5dfc99	245	unsigned int remap_flags)
bea51b30 PT	246	{
bea51b30 PT	247	struct inode *dst_inode = file_inode(dst_file);
811b7b85	248	struct nfs_server *server = NFS_SERVER(dst_inode);
04b38d60	249	struct inode *src_inode = file_inode(src_file);
811b7b85	250	unsigned int bs = server->clone_blksize;
21fad313	251	bool same_inode = false;
bea51b30 PT	252	int ret;
bea51b30 PT	253
9026b3a9 DW	254	/* NFS does not support deduplication. */
	255	if (remap_flags & REMAP_FILE_DEDUP)
	256	return -EOPNOTSUPP;
	257
	258	if (remap_flags & ~REMAP_FILE_ADVISORY)
2e5dfc99 DW	259	return -EINVAL;
2e5dfc99 DW	260
f5fdf124 MZ	261	if (IS_SWAPFILE(dst_inode) \|\| IS_SWAPFILE(src_inode))
	262	return -ETXTBSY;
	263
811b7b85 PT	264	/* check alignment w.r.t. clone_blksize */
	265	ret = -EINVAL;
	266	if (bs) {
	267	if (!IS_ALIGNED(src_off, bs) \|\| !IS_ALIGNED(dst_off, bs))
04b38d60	268	goto out;
811b7b85	269	if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
04b38d60	270	goto out;
811b7b85 PT	271	}
811b7b85 PT	272
04b38d60 CH	273	if (src_inode == dst_inode)
04b38d60 CH	274	same_inode = true;
21fad313	275
bea51b30	276	/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
21fad313	277	if (same_inode) {
5955102c	278	inode_lock(src_inode);
21fad313	279	} else if (dst_inode < src_inode) {
5955102c AV	280	inode_lock_nested(dst_inode, I_MUTEX_PARENT);
5955102c AV	281	inode_lock_nested(src_inode, I_MUTEX_CHILD);
bea51b30	282	} else {
5955102c AV	283	inode_lock_nested(src_inode, I_MUTEX_PARENT);
5955102c AV	284	inode_lock_nested(dst_inode, I_MUTEX_CHILD);
bea51b30 PT	285	}
	286
	287	/* flush all pending writes on both src and dst so that server
	288	* has the latest data */
	289	ret = nfs_sync_inode(src_inode);
	290	if (ret)
	291	goto out_unlock;
	292	ret = nfs_sync_inode(dst_inode);
	293	if (ret)
	294	goto out_unlock;
	295
04b38d60	296	ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
bea51b30 PT	297
	298	/* truncate inode page cache of the dst range so that future reads can fetch
	299	* new data from server */
	300	if (!ret)
	301	truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
	302
	303	out_unlock:
21fad313	304	if (same_inode) {
5955102c	305	inode_unlock(src_inode);
21fad313	306	} else if (dst_inode < src_inode) {
5955102c AV	307	inode_unlock(src_inode);
5955102c AV	308	inode_unlock(dst_inode);
bea51b30	309	} else {
5955102c AV	310	inode_unlock(dst_inode);
5955102c AV	311	inode_unlock(src_inode);
bea51b30	312	}
04b38d60	313	out:
42ec3d4c	314	return ret < 0 ? ret : count;
bea51b30	315	}
ec4b0925 OK	316
	317	static int read_name_gen = 1;
	318	#define SSC_READ_NAME_BODY "ssc_read_%d"
	319
0cfcd405 DN	320	static struct file __nfs42_ssc_open(struct vfsmount ss_mnt,
0cfcd405 DN	321	struct nfs_fh src_fh, nfs4_stateid stateid)
ec4b0925	322	{
156cd285	323	struct nfs_fattr *fattr = nfs_alloc_fattr();
ec4b0925 OK	324	struct file filep, res;
	325	struct nfs_server *server;
	326	struct inode *r_ino = NULL;
	327	struct nfs_open_context *ctx;
	328	struct nfs4_state_owner *sp;
f751c545	329	char *read_name = NULL;
ec4b0925 OK	330	int len, status = 0;
ec4b0925 OK	331
f6957b71	332	server = NFS_SB(ss_mnt->mnt_sb);
ec4b0925	333
156cd285 TM	334	if (!fattr)
156cd285 TM	335	return ERR_PTR(-ENOMEM);
ec4b0925	336
2ef61e0e	337	status = nfs4_proc_getattr(server, src_fh, fattr, NULL);
ec4b0925 OK	338	if (status < 0) {
	339	res = ERR_PTR(status);
	340	goto out;
	341	}
	342
fcfc8be1 OK	343	if (!S_ISREG(fattr->mode)) {
	344	res = ERR_PTR(-EBADF);
	345	goto out;
	346	}
	347
ec4b0925 OK	348	res = ERR_PTR(-ENOMEM);
ec4b0925 OK	349	len = strlen(SSC_READ_NAME_BODY) + 16;
4fb547be	350	read_name = kzalloc(len, GFP_KERNEL);
ec4b0925 OK	351	if (read_name == NULL)
	352	goto out;
	353	snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
	354
f6957b71	355	r_ino = nfs_fhget(ss_mnt->mnt_sb, src_fh, fattr);
ec4b0925 OK	356	if (IS_ERR(r_ino)) {
ec4b0925 OK	357	res = ERR_CAST(r_ino);
f751c545	358	goto out_free_name;
ec4b0925 OK	359	}
ec4b0925 OK	360
aa97a3ef	361	filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, O_RDONLY,
ec4b0925 OK	362	r_ino->i_fop);
	363	if (IS_ERR(filep)) {
	364	res = ERR_CAST(filep);
fcfc8be1	365	iput(r_ino);
f751c545	366	goto out_free_name;
ec4b0925	367	}
ec4b0925 OK	368
	369	ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
	370	filep);
	371	if (IS_ERR(ctx)) {
	372	res = ERR_CAST(ctx);
	373	goto out_filep;
	374	}
	375
	376	res = ERR_PTR(-EINVAL);
	377	sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
	378	if (sp == NULL)
	379	goto out_ctx;
	380
	381	ctx->state = nfs4_get_open_state(r_ino, sp);
	382	if (ctx->state == NULL)
	383	goto out_stateowner;
	384
0b9018b9	385	set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
ec4b0925 OK	386	memcpy(&ctx->state->open_stateid.other, &stateid->other,
	387	NFS4_STATEID_OTHER_SIZE);
	388	update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
fe8eb820	389	set_bit(NFS_OPEN_STATE, &ctx->state->flags);
ec4b0925 OK	390
	391	nfs_file_set_open_context(filep, ctx);
	392	put_nfs_open_context(ctx);
	393
	394	file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
	395	res = filep;
f751c545 OK	396	out_free_name:
f751c545 OK	397	kfree(read_name);
ec4b0925	398	out:
156cd285	399	nfs_free_fattr(fattr);
ec4b0925 OK	400	return res;
	401	out_stateowner:
	402	nfs4_put_state_owner(sp);
	403	out_ctx:
	404	put_nfs_open_context(ctx);
	405	out_filep:
	406	fput(filep);
f751c545	407	goto out_free_name;
ec4b0925	408	}
0cfcd405 DN	409
0cfcd405 DN	410	static void __nfs42_ssc_close(struct file *filep)
ec4b0925 OK	411	{
	412	struct nfs_open_context *ctx = nfs_file_open_context(filep);
	413
	414	ctx->state->flags = 0;
	415	}
0cfcd405 DN	416
	417	static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = {
	418	.sco_open = __nfs42_ssc_open,
	419	.sco_close = __nfs42_ssc_close,
	420	};
	421
	422	/**
	423	* nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common
	424	*
	425	* Return values:
	426	* None
	427	*/
	428	void nfs42_ssc_register_ops(void)
	429	{
	430	nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
	431	}
	432
	433	/**
	434	* nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common
	435	*
	436	* Return values:
	437	* None.
	438	*/
	439	void nfs42_ssc_unregister_ops(void)
	440	{
	441	nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
	442	}
6b7153da	443	#endif /* CONFIG_NFS_V4_2 */
bea51b30	444
e93a5e93 TM	445	static int nfs4_setlease(struct file file, long arg, struct file_lock *lease,
	446	void **priv)
	447	{
	448	return nfs4_proc_setlease(file, arg, lease, priv);
	449	}
	450
ce4ef7c0	451	const struct file_operations nfs4_file_operations = {
3aa2d199	452	.read_iter = nfs_file_read,
edaf4369	453	.write_iter = nfs_file_write,
ce4ef7c0 BS	454	.mmap = nfs_file_mmap,
ce4ef7c0 BS	455	.open = nfs4_file_open,
5445b1fb	456	.flush = nfs4_file_flush,
ce4ef7c0	457	.release = nfs_file_release,
4ff79bc7	458	.fsync = nfs_file_fsync,
ce4ef7c0 BS	459	.lock = nfs_lock,
ce4ef7c0 BS	460	.flock = nfs_flock,
82c156f8	461	.splice_read = generic_file_splice_read,
4da54c21	462	.splice_write = iter_file_splice_write,
ce4ef7c0	463	.check_flags = nfs_check_flags,
e93a5e93	464	.setlease = nfs4_setlease,
6b7153da	465	#ifdef CONFIG_NFS_V4_2
2e72448b	466	.copy_file_range = nfs4_copy_file_range,
6b7153da CH	467	.llseek = nfs4_file_llseek,
6b7153da CH	468	.fallocate = nfs42_fallocate,
2e5dfc99	469	.remap_file_range = nfs42_remap_file_range,
6b7153da CH	470	#else
	471	.llseek = nfs_file_llseek,
	472	#endif
ce4ef7c0	473	};