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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 */

#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/buffer_head.h>

#include "exfat_raw.h"
#include "exfat_fs.h"

static int exfat_cont_expand(struct inode *inode, loff_t size)
{
	struct address_space *mapping = inode->i_mapping;
	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
	int err, err2;

	err = generic_cont_expand_simple(inode, size);
	if (err)
		return err;

	inode->i_ctime = inode->i_mtime = current_time(inode);
	mark_inode_dirty(inode);

	if (!IS_SYNC(inode))
		return 0;

	err = filemap_fdatawrite_range(mapping, start, start + count - 1);
	err2 = sync_mapping_buffers(mapping);
	if (!err)
		err = err2;
	err2 = write_inode_now(inode, 1);
	if (!err)
		err = err2;
	if (err)
		return err;

	return filemap_fdatawait_range(mapping, start, start + count - 1);
}

static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
{
	mode_t allow_utime = sbi->options.allow_utime;

	if (!uid_eq(current_fsuid(), inode->i_uid)) {
		if (in_group_p(inode->i_gid))
			allow_utime >>= 3;
		if (allow_utime & MAY_WRITE)
			return true;
	}

	/* use a default check */
	return false;
}

static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
		struct inode *inode, umode_t *mode_ptr)
{
	mode_t i_mode, mask, perm;

	i_mode = inode->i_mode;

	mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
		sbi->options.fs_fmask : sbi->options.fs_dmask;
	perm = *mode_ptr & ~(S_IFMT | mask);

	/* Of the r and x bits, all (subject to umask) must be present.*/
	if ((perm & 0555) != (i_mode & 0555))
		return -EPERM;

	if (exfat_mode_can_hold_ro(inode)) {
		/*
		 * Of the w bits, either all (subject to umask) or none must
		 * be present.
		 */
		if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
			return -EPERM;
	} else {
		/*
		 * If exfat_mode_can_hold_ro(inode) is false, can't change
		 * w bits.
		 */
		if ((perm & 0222) != (0222 & ~mask))
			return -EPERM;
	}

	*mode_ptr &= S_IFMT | perm;

	return 0;
}

/* resize the file length */
int __exfat_truncate(struct inode *inode, loff_t new_size)
{
	unsigned int num_clusters_new, num_clusters_phys;
	unsigned int last_clu = EXFAT_FREE_CLUSTER;
	struct exfat_chain clu;
	struct exfat_dentry *ep, *ep2;
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	struct exfat_entry_set_cache *es = NULL;
	int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0;

	/* check if the given file ID is opened */
	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
		return -EPERM;

	exfat_set_vol_flags(sb, VOL_DIRTY);

	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
	num_clusters_phys =
		EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi);

	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);

	if (new_size > 0) {
		/*
		 * Truncate FAT chain num_clusters after the first cluster
		 * num_clusters = min(new, phys);
		 */
		unsigned int num_clusters =
			min(num_clusters_new, num_clusters_phys);

		/*
		 * Follow FAT chain
		 * (defensive coding - works fine even with corrupted FAT table
		 */
		if (clu.flags == ALLOC_NO_FAT_CHAIN) {
			clu.dir += num_clusters;
			clu.size -= num_clusters;
		} else {
			while (num_clusters > 0) {
				last_clu = clu.dir;
				if (exfat_get_next_cluster(sb, &(clu.dir)))
					return -EIO;

				num_clusters--;
				clu.size--;
			}
		}
	} else {
		ei->flags = ALLOC_NO_FAT_CHAIN;
		ei->start_clu = EXFAT_EOF_CLUSTER;
	}

	i_size_write(inode, new_size);

	if (ei->type == TYPE_FILE)
		ei->attr |= ATTR_ARCHIVE;

	/* update the directory entry */
	if (!evict) {
		struct timespec64 ts;

		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
				ES_ALL_ENTRIES, &ep);
		if (!es)
			return -EIO;
		ep2 = ep + 1;

		ts = current_time(inode);
		exfat_set_entry_time(sbi, &ts,
				&ep->dentry.file.modify_tz,
				&ep->dentry.file.modify_time,
				&ep->dentry.file.modify_date,
				&ep->dentry.file.modify_time_ms);
		ep->dentry.file.attr = cpu_to_le16(ei->attr);

		/* File size should be zero if there is no cluster allocated */
		if (ei->start_clu == EXFAT_EOF_CLUSTER) {
			ep->dentry.stream.valid_size = 0;
			ep->dentry.stream.size = 0;
		} else {
			ep->dentry.stream.valid_size = cpu_to_le64(new_size);
			ep->dentry.stream.size = ep->dentry.stream.valid_size;
		}

		if (new_size == 0) {
			/* Any directory can not be truncated to zero */
			WARN_ON(ei->type != TYPE_FILE);

			ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
			ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
		}

		if (exfat_update_dir_chksum_with_entry_set(sb, es,
		    inode_needs_sync(inode)))
			return -EIO;
		kfree(es);
	}

	/* cut off from the FAT chain */
	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
			last_clu != EXFAT_EOF_CLUSTER) {
		if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
			return -EIO;
	}

	/* invalidate cache and free the clusters */
	/* clear exfat cache */
	exfat_cache_inval_inode(inode);

	/* hint information */
	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
	if (ei->rwoffset > new_size)
		ei->rwoffset = new_size;

	/* hint_stat will be used if this is directory. */
	ei->hint_stat.eidx = 0;
	ei->hint_stat.clu = ei->start_clu;
	ei->hint_femp.eidx = EXFAT_HINT_NONE;

	/* free the clusters */
	if (exfat_free_cluster(inode, &clu))
		return -EIO;

	exfat_set_vol_flags(sb, VOL_CLEAN);

	return 0;
}

void exfat_truncate(struct inode *inode, loff_t size)
{
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	unsigned int blocksize = 1 << inode->i_blkbits;
	loff_t aligned_size;
	int err;

	mutex_lock(&sbi->s_lock);
	if (EXFAT_I(inode)->start_clu == 0) {
		/*
		 * Empty start_clu != ~0 (not allocated)
		 */
		exfat_fs_error(sb, "tried to truncate zeroed cluster.");
		goto write_size;
	}

	err = __exfat_truncate(inode, i_size_read(inode));
	if (err)
		goto write_size;

	inode->i_ctime = inode->i_mtime = current_time(inode);
	if (IS_DIRSYNC(inode))
		exfat_sync_inode(inode);
	else
		mark_inode_dirty(inode);

	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
			~(sbi->cluster_size - 1)) >> inode->i_blkbits;
write_size:
	aligned_size = i_size_read(inode);
	if (aligned_size & (blocksize - 1)) {
		aligned_size |= (blocksize - 1);
		aligned_size++;
	}

	if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
		EXFAT_I(inode)->i_size_ondisk = aligned_size;

	if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
		EXFAT_I(inode)->i_size_aligned = aligned_size;
	mutex_unlock(&sbi->s_lock);
}

int exfat_getattr(const struct path *path, struct kstat *stat,
		unsigned int request_mask, unsigned int query_flags)
{
	struct inode *inode = d_backing_inode(path->dentry);
	struct exfat_inode_info *ei = EXFAT_I(inode);

	generic_fillattr(inode, stat);
	exfat_truncate_atime(&stat->atime);
	stat->result_mask |= STATX_BTIME;
	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	return 0;
}

int exfat_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	struct inode *inode = dentry->d_inode;
	unsigned int ia_valid;
	int error;

	if ((attr->ia_valid & ATTR_SIZE) &&
	    attr->ia_size > i_size_read(inode)) {
		error = exfat_cont_expand(inode, attr->ia_size);
		if (error || attr->ia_valid == ATTR_SIZE)
			return error;
		attr->ia_valid &= ~ATTR_SIZE;
	}

	/* Check for setting the inode time. */
	ia_valid = attr->ia_valid;
	if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
	    exfat_allow_set_time(sbi, inode)) {
		attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
				ATTR_TIMES_SET);
	}

	error = setattr_prepare(dentry, attr);
	attr->ia_valid = ia_valid;
	if (error)
		goto out;

	if (((attr->ia_valid & ATTR_UID) &&
	     !uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
	    ((attr->ia_valid & ATTR_GID) &&
	     !gid_eq(attr->ia_gid, sbi->options.fs_gid)) ||
	    ((attr->ia_valid & ATTR_MODE) &&
	     (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
		error = -EPERM;
		goto out;
	}

	/*
	 * We don't return -EPERM here. Yes, strange, but this is too
	 * old behavior.
	 */
	if (attr->ia_valid & ATTR_MODE) {
		if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
			attr->ia_valid &= ~ATTR_MODE;
	}

	if (attr->ia_valid & ATTR_SIZE) {
		error = exfat_block_truncate_page(inode, attr->ia_size);
		if (error)
			goto out;

		down_write(&EXFAT_I(inode)->truncate_lock);
		truncate_setsize(inode, attr->ia_size);
		exfat_truncate(inode, attr->ia_size);
		up_write(&EXFAT_I(inode)->truncate_lock);
	}

	setattr_copy(inode, attr);
	exfat_truncate_atime(&inode->i_atime);
	mark_inode_dirty(inode);

out:
	return error;
}

const struct file_operations exfat_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.mmap		= generic_file_mmap,
	.fsync		= generic_file_fsync,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
};

const struct inode_operations exfat_file_inode_operations = {
	.setattr     = exfat_setattr,
	.getattr     = exfat_getattr,
};
Commit	Line	Data
98d91704 NJ	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
	4	*/
	5
	6	#include <linux/slab.h>
	7	#include <linux/cred.h>
	8	#include <linux/buffer_head.h>
	9
	10	#include "exfat_raw.h"
	11	#include "exfat_fs.h"
	12
	13	static int exfat_cont_expand(struct inode *inode, loff_t size)
	14	{
	15	struct address_space *mapping = inode->i_mapping;
	16	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
	17	int err, err2;
	18
	19	err = generic_cont_expand_simple(inode, size);
	20	if (err)
	21	return err;
	22
	23	inode->i_ctime = inode->i_mtime = current_time(inode);
	24	mark_inode_dirty(inode);
	25
	26	if (!IS_SYNC(inode))
	27	return 0;
	28
	29	err = filemap_fdatawrite_range(mapping, start, start + count - 1);
	30	err2 = sync_mapping_buffers(mapping);
	31	if (!err)
	32	err = err2;
	33	err2 = write_inode_now(inode, 1);
	34	if (!err)
	35	err = err2;
	36	if (err)
	37	return err;
	38
	39	return filemap_fdatawait_range(mapping, start, start + count - 1);
	40	}
	41
	42	static bool exfat_allow_set_time(struct exfat_sb_info sbi, struct inode inode)
	43	{
	44	mode_t allow_utime = sbi->options.allow_utime;
	45
	46	if (!uid_eq(current_fsuid(), inode->i_uid)) {
	47	if (in_group_p(inode->i_gid))
	48	allow_utime >>= 3;
	49	if (allow_utime & MAY_WRITE)
	50	return true;
	51	}
	52
	53	/* use a default check */
	54	return false;
	55	}
	56
	57	static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
	58	struct inode inode, umode_t mode_ptr)
	59	{
	60	mode_t i_mode, mask, perm;
	61
	62	i_mode = inode->i_mode;
	63
	64	mask = (S_ISREG(i_mode) \|\| S_ISLNK(i_mode)) ?
65	sbi->options.fs_fmask : sbi->options.fs_dmask;
66	perm = *mode_ptr & ~(S_IFMT \| mask);
67
68	/* Of the r and x bits, all (subject to umask) must be present.*/
69	if ((perm & 0555) != (i_mode & 0555))
70	return -EPERM;
71
72	if (exfat_mode_can_hold_ro(inode)) {
73	/*
74	* Of the w bits, either all (subject to umask) or none must
75	* be present.
76	*/
77	if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
78	return -EPERM;
79	} else {
80	/*
81	* If exfat_mode_can_hold_ro(inode) is false, can't change
82	* w bits.
83	*/
84	if ((perm & 0222) != (0222 & ~mask))
85	return -EPERM;
86	}
87
88	*mode_ptr &= S_IFMT \| perm;
89
90	return 0;
91	}
92
93	/* resize the file length */
94	int __exfat_truncate(struct inode *inode, loff_t new_size)
95	{
96	unsigned int num_clusters_new, num_clusters_phys;
97	unsigned int last_clu = EXFAT_FREE_CLUSTER;
98	struct exfat_chain clu;
99	struct exfat_dentry ep, ep2;
100	struct super_block *sb = inode->i_sb;
101	struct exfat_sb_info *sbi = EXFAT_SB(sb);
102	struct exfat_inode_info *ei = EXFAT_I(inode);
103	struct exfat_entry_set_cache *es = NULL;
104	int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0;
105
106	/* check if the given file ID is opened */
107	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
108	return -EPERM;
109
110	exfat_set_vol_flags(sb, VOL_DIRTY);
111
112	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
113	num_clusters_phys =
114	EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi);
115
116	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
117
118	if (new_size > 0) {
119	/*
120	* Truncate FAT chain num_clusters after the first cluster
121	* num_clusters = min(new, phys);
122	*/
123	unsigned int num_clusters =
124	min(num_clusters_new, num_clusters_phys);
125
126	/*
127	* Follow FAT chain
128	* (defensive coding - works fine even with corrupted FAT table
129	*/
130	if (clu.flags == ALLOC_NO_FAT_CHAIN) {
131	clu.dir += num_clusters;
132	clu.size -= num_clusters;
133	} else {
134	while (num_clusters > 0) {
135	last_clu = clu.dir;
136	if (exfat_get_next_cluster(sb, &(clu.dir)))
137	return -EIO;
138
139	num_clusters--;
140	clu.size--;
141	}
142	}
143	} else {
144	ei->flags = ALLOC_NO_FAT_CHAIN;
145	ei->start_clu = EXFAT_EOF_CLUSTER;
146	}
147
148	i_size_write(inode, new_size);
149
150	if (ei->type == TYPE_FILE)
151	ei->attr \|= ATTR_ARCHIVE;
152
153	/* update the directory entry */
154	if (!evict) {
155	struct timespec64 ts;
156
157	es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
158	ES_ALL_ENTRIES, &ep);
159	if (!es)
160	return -EIO;
161	ep2 = ep + 1;
162
163	ts = current_time(inode);
164	exfat_set_entry_time(sbi, &ts,
165	&ep->dentry.file.modify_tz,
166	&ep->dentry.file.modify_time,
167	&ep->dentry.file.modify_date,
168	&ep->dentry.file.modify_time_ms);
169	ep->dentry.file.attr = cpu_to_le16(ei->attr);
170
171	/* File size should be zero if there is no cluster allocated */
172	if (ei->start_clu == EXFAT_EOF_CLUSTER) {
173	ep->dentry.stream.valid_size = 0;
174	ep->dentry.stream.size = 0;
175	} else {
176	ep->dentry.stream.valid_size = cpu_to_le64(new_size);
177	ep->dentry.stream.size = ep->dentry.stream.valid_size;
178	}
179
180	if (new_size == 0) {
181	/* Any directory can not be truncated to zero */
182	WARN_ON(ei->type != TYPE_FILE);
183
184	ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
185	ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
186	}
187
188	if (exfat_update_dir_chksum_with_entry_set(sb, es,
189	inode_needs_sync(inode)))
190	return -EIO;
191	kfree(es);
192	}
193
194	/* cut off from the FAT chain */
195	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
196	last_clu != EXFAT_EOF_CLUSTER) {
197	if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
198	return -EIO;
199	}
200
201	/* invalidate cache and free the clusters */
202	/* clear exfat cache */
203	exfat_cache_inval_inode(inode);
204
205	/* hint information */
206	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
207	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
208	if (ei->rwoffset > new_size)
209	ei->rwoffset = new_size;
210
211	/* hint_stat will be used if this is directory. */
212	ei->hint_stat.eidx = 0;
213	ei->hint_stat.clu = ei->start_clu;
214	ei->hint_femp.eidx = EXFAT_HINT_NONE;
215
216	/* free the clusters */
217	if (exfat_free_cluster(inode, &clu))
218	return -EIO;
219
220	exfat_set_vol_flags(sb, VOL_CLEAN);
221
222	return 0;
223	}
224
225	void exfat_truncate(struct inode *inode, loff_t size)
226	{
227	struct super_block *sb = inode->i_sb;
228	struct exfat_sb_info *sbi = EXFAT_SB(sb);
229	unsigned int blocksize = 1 << inode->i_blkbits;
230	loff_t aligned_size;
231	int err;
232
233	mutex_lock(&sbi->s_lock);
234	if (EXFAT_I(inode)->start_clu == 0) {
235	/*
236	* Empty start_clu != ~0 (not allocated)
237	*/
238	exfat_fs_error(sb, "tried to truncate zeroed cluster.");
239	goto write_size;
240	}
241
242	err = __exfat_truncate(inode, i_size_read(inode));
243	if (err)
244	goto write_size;
245
246	inode->i_ctime = inode->i_mtime = current_time(inode);
247	if (IS_DIRSYNC(inode))
248	exfat_sync_inode(inode);
249	else
250	mark_inode_dirty(inode);
251
252	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
253	~(sbi->cluster_size - 1)) >> inode->i_blkbits;
254	write_size:
255	aligned_size = i_size_read(inode);
256	if (aligned_size & (blocksize - 1)) {
257	aligned_size \|= (blocksize - 1);
258	aligned_size++;
259	}
260
261	if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
262	EXFAT_I(inode)->i_size_ondisk = aligned_size;
263
264	if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
265	EXFAT_I(inode)->i_size_aligned = aligned_size;
266	mutex_unlock(&sbi->s_lock);
267	}
268
269	int exfat_getattr(const struct path path, struct kstat stat,
270	unsigned int request_mask, unsigned int query_flags)
271	{
272	struct inode *inode = d_backing_inode(path->dentry);
273	struct exfat_inode_info *ei = EXFAT_I(inode);
274
275	generic_fillattr(inode, stat);
81df1ad4	276	exfat_truncate_atime(&stat->atime);
98d91704 NJ	277	stat->result_mask \|= STATX_BTIME;
	278	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	279	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	280	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	281	return 0;
	282	}
	283
	284	int exfat_setattr(struct dentry dentry, struct iattr attr)
	285	{
	286	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	287	struct inode *inode = dentry->d_inode;
	288	unsigned int ia_valid;
	289	int error;
	290
	291	if ((attr->ia_valid & ATTR_SIZE) &&
	292	attr->ia_size > i_size_read(inode)) {
	293	error = exfat_cont_expand(inode, attr->ia_size);
	294	if (error \|\| attr->ia_valid == ATTR_SIZE)
	295	return error;
	296	attr->ia_valid &= ~ATTR_SIZE;
	297	}
	298
	299	/* Check for setting the inode time. */
	300	ia_valid = attr->ia_valid;
	301	if ((ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET \| ATTR_TIMES_SET)) &&
	302	exfat_allow_set_time(sbi, inode)) {
	303	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET \|
	304	ATTR_TIMES_SET);
	305	}
	306
	307	error = setattr_prepare(dentry, attr);
	308	attr->ia_valid = ia_valid;
	309	if (error)
	310	goto out;
	311
	312	if (((attr->ia_valid & ATTR_UID) &&
	313	!uid_eq(attr->ia_uid, sbi->options.fs_uid)) \|\|
	314	((attr->ia_valid & ATTR_GID) &&
	315	!gid_eq(attr->ia_gid, sbi->options.fs_gid)) \|\|
	316	((attr->ia_valid & ATTR_MODE) &&
	317	(attr->ia_mode & ~(S_IFREG \| S_IFLNK \| S_IFDIR \| 0777)))) {
	318	error = -EPERM;
	319	goto out;
	320	}
	321
	322	/*
	323	* We don't return -EPERM here. Yes, strange, but this is too
	324	* old behavior.
	325	*/
	326	if (attr->ia_valid & ATTR_MODE) {
	327	if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	328	attr->ia_valid &= ~ATTR_MODE;
	329	}
	330
	331	if (attr->ia_valid & ATTR_SIZE) {
	332	error = exfat_block_truncate_page(inode, attr->ia_size);
	333	if (error)
	334	goto out;
	335
	336	down_write(&EXFAT_I(inode)->truncate_lock);
	337	truncate_setsize(inode, attr->ia_size);
	338	exfat_truncate(inode, attr->ia_size);
	339	up_write(&EXFAT_I(inode)->truncate_lock);
	340	}
341
342	setattr_copy(inode, attr);
81df1ad4	343	exfat_truncate_atime(&inode->i_atime);
98d91704 NJ	344	mark_inode_dirty(inode);
	345
	346	out:
	347	return error;
	348	}
	349
	350	const struct file_operations exfat_file_operations = {
03577948 ES	351	.llseek = generic_file_llseek,
	352	.read_iter = generic_file_read_iter,
	353	.write_iter = generic_file_write_iter,
	354	.mmap = generic_file_mmap,
	355	.fsync = generic_file_fsync,
	356	.splice_read = generic_file_splice_read,
	357	.splice_write = iter_file_splice_write,
98d91704 NJ	358	};
	359
	360	const struct inode_operations exfat_file_inode_operations = {
	361	.setattr = exfat_setattr,
	362	.getattr = exfat_getattr,
	363	};