[linux-block.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 <linux/blkdev.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 super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	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_volume_dirty(sb);

	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;
		struct exfat_dentry *ep, *ep2;
		struct exfat_entry_set_cache *es;
		int err;

		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
				ES_ALL_ENTRIES);
		if (!es)
			return -EIO;
		ep = exfat_get_dentry_cached(es, 0);
		ep2 = exfat_get_dentry_cached(es, 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_cs);
		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) {
			ep2->dentry.stream.valid_size = 0;
			ep2->dentry.stream.size = 0;
		} else {
			ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
			ep2->dentry.stream.size = ep2->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;
		}

		exfat_update_dir_chksum_with_entry_set(es);
		err = exfat_free_dentry_set(es, inode_needs_sync(inode));
		if (err)
			return err;
	}

	/* 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;

	/* 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_clear_volume_dirty(sb);

	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 = i_blocksize(inode);
	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(&init_user_ns, 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(&init_user_ns, inode, attr);
	exfat_truncate_atime(&inode->i_atime);
	mark_inode_dirty(inode);

out:
	return error;
}

int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	int err;

	err = __generic_file_fsync(filp, start, end, datasync);
	if (err)
		return err;

	err = sync_blockdev(inode->i_sb->s_bdev);
	if (err)
		return err;

	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
}

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		= exfat_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>
5267456e	9	#include <linux/blkdev.h>
98d91704 NJ	10
	11	#include "exfat_raw.h"
	12	#include "exfat_fs.h"
	13
	14	static int exfat_cont_expand(struct inode *inode, loff_t size)
	15	{
	16	struct address_space *mapping = inode->i_mapping;
	17	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
	18	int err, err2;
	19
	20	err = generic_cont_expand_simple(inode, size);
	21	if (err)
	22	return err;
	23
	24	inode->i_ctime = inode->i_mtime = current_time(inode);
	25	mark_inode_dirty(inode);
	26
	27	if (!IS_SYNC(inode))
	28	return 0;
	29
	30	err = filemap_fdatawrite_range(mapping, start, start + count - 1);
	31	err2 = sync_mapping_buffers(mapping);
	32	if (!err)
	33	err = err2;
	34	err2 = write_inode_now(inode, 1);
	35	if (!err)
	36	err = err2;
	37	if (err)
	38	return err;
	39
	40	return filemap_fdatawait_range(mapping, start, start + count - 1);
	41	}
	42
	43	static bool exfat_allow_set_time(struct exfat_sb_info sbi, struct inode inode)
	44	{
	45	mode_t allow_utime = sbi->options.allow_utime;
	46
	47	if (!uid_eq(current_fsuid(), inode->i_uid)) {
	48	if (in_group_p(inode->i_gid))
	49	allow_utime >>= 3;
	50	if (allow_utime & MAY_WRITE)
	51	return true;
	52	}
	53
	54	/* use a default check */
	55	return false;
	56	}
	57
	58	static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
	59	struct inode inode, umode_t mode_ptr)
	60	{
	61	mode_t i_mode, mask, perm;
	62
	63	i_mode = inode->i_mode;
	64
	65	mask = (S_ISREG(i_mode) \|\| S_ISLNK(i_mode)) ?
	66	sbi->options.fs_fmask : sbi->options.fs_dmask;
	67	perm = *mode_ptr & ~(S_IFMT \| mask);
	68
	69	/* Of the r and x bits, all (subject to umask) must be present.*/
	70	if ((perm & 0555) != (i_mode & 0555))
	71	return -EPERM;
	72
	73	if (exfat_mode_can_hold_ro(inode)) {
74	/*
75	* Of the w bits, either all (subject to umask) or none must
76	* be present.
77	*/
78	if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
79	return -EPERM;
80	} else {
81	/*
82	* If exfat_mode_can_hold_ro(inode) is false, can't change
83	* w bits.
84	*/
85	if ((perm & 0222) != (0222 & ~mask))
86	return -EPERM;
87	}
88
89	*mode_ptr &= S_IFMT \| perm;
90
91	return 0;
92	}
93
94	/* resize the file length */
95	int __exfat_truncate(struct inode *inode, loff_t new_size)
96	{
97	unsigned int num_clusters_new, num_clusters_phys;
98	unsigned int last_clu = EXFAT_FREE_CLUSTER;
99	struct exfat_chain clu;
98d91704 NJ	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);
98d91704 NJ	103	int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0;
	104
	105	/* check if the given file ID is opened */
	106	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
	107	return -EPERM;
	108
7018ec68	109	exfat_set_volume_dirty(sb);
98d91704 NJ	110
	111	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
	112	num_clusters_phys =
	113	EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi);
	114
	115	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
	116
	117	if (new_size > 0) {
	118	/*
	119	* Truncate FAT chain num_clusters after the first cluster
	120	* num_clusters = min(new, phys);
	121	*/
	122	unsigned int num_clusters =
	123	min(num_clusters_new, num_clusters_phys);
	124
	125	/*
	126	* Follow FAT chain
	127	* (defensive coding - works fine even with corrupted FAT table
	128	*/
	129	if (clu.flags == ALLOC_NO_FAT_CHAIN) {
	130	clu.dir += num_clusters;
	131	clu.size -= num_clusters;
	132	} else {
	133	while (num_clusters > 0) {
	134	last_clu = clu.dir;
	135	if (exfat_get_next_cluster(sb, &(clu.dir)))
	136	return -EIO;
	137
	138	num_clusters--;
	139	clu.size--;
	140	}
	141	}
	142	} else {
	143	ei->flags = ALLOC_NO_FAT_CHAIN;
	144	ei->start_clu = EXFAT_EOF_CLUSTER;
	145	}
	146
	147	i_size_write(inode, new_size);
	148
	149	if (ei->type == TYPE_FILE)
	150	ei->attr \|= ATTR_ARCHIVE;
	151
	152	/* update the directory entry */
	153	if (!evict) {
	154	struct timespec64 ts;
943af1fd TK	155	struct exfat_dentry ep, ep2;
943af1fd TK	156	struct exfat_entry_set_cache *es;
8b0c4717	157	int err;
98d91704 NJ	158
98d91704 NJ	159	es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
943af1fd	160	ES_ALL_ENTRIES);
98d91704 NJ	161	if (!es)
98d91704 NJ	162	return -EIO;
943af1fd TK	163	ep = exfat_get_dentry_cached(es, 0);
943af1fd TK	164	ep2 = exfat_get_dentry_cached(es, 1);
98d91704 NJ	165
	166	ts = current_time(inode);
	167	exfat_set_entry_time(sbi, &ts,
	168	&ep->dentry.file.modify_tz,
	169	&ep->dentry.file.modify_time,
	170	&ep->dentry.file.modify_date,
ed0f84d3	171	&ep->dentry.file.modify_time_cs);
98d91704 NJ	172	ep->dentry.file.attr = cpu_to_le16(ei->attr);
	173
	174	/* File size should be zero if there is no cluster allocated */
	175	if (ei->start_clu == EXFAT_EOF_CLUSTER) {
29bbb14b NJ	176	ep2->dentry.stream.valid_size = 0;
29bbb14b NJ	177	ep2->dentry.stream.size = 0;
98d91704	178	} else {
29bbb14b	179	ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
41e3928f	180	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
98d91704 NJ	181	}
	182
	183	if (new_size == 0) {
	184	/* Any directory can not be truncated to zero */
	185	WARN_ON(ei->type != TYPE_FILE);
	186
	187	ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
	188	ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
	189	}
	190
943af1fd	191	exfat_update_dir_chksum_with_entry_set(es);
8b0c4717 TK	192	err = exfat_free_dentry_set(es, inode_needs_sync(inode));
	193	if (err)
	194	return err;
98d91704 NJ	195	}
	196
	197	/* cut off from the FAT chain */
	198	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
	199	last_clu != EXFAT_EOF_CLUSTER) {
	200	if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
	201	return -EIO;
	202	}
	203
	204	/* invalidate cache and free the clusters */
	205	/* clear exfat cache */
	206	exfat_cache_inval_inode(inode);
	207
	208	/* hint information */
	209	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	210	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
98d91704 NJ	211
	212	/* hint_stat will be used if this is directory. */
	213	ei->hint_stat.eidx = 0;
	214	ei->hint_stat.clu = ei->start_clu;
	215	ei->hint_femp.eidx = EXFAT_HINT_NONE;
	216
	217	/* free the clusters */
	218	if (exfat_free_cluster(inode, &clu))
	219	return -EIO;
	220
7018ec68	221	exfat_clear_volume_dirty(sb);
98d91704 NJ	222
	223	return 0;
	224	}
	225
	226	void exfat_truncate(struct inode *inode, loff_t size)
	227	{
	228	struct super_block *sb = inode->i_sb;
	229	struct exfat_sb_info *sbi = EXFAT_SB(sb);
45882a6a	230	unsigned int blocksize = i_blocksize(inode);
98d91704 NJ	231	loff_t aligned_size;
	232	int err;
	233
	234	mutex_lock(&sbi->s_lock);
	235	if (EXFAT_I(inode)->start_clu == 0) {
	236	/*
	237	* Empty start_clu != ~0 (not allocated)
	238	*/
	239	exfat_fs_error(sb, "tried to truncate zeroed cluster.");
	240	goto write_size;
	241	}
	242
	243	err = __exfat_truncate(inode, i_size_read(inode));
	244	if (err)
	245	goto write_size;
	246
	247	inode->i_ctime = inode->i_mtime = current_time(inode);
	248	if (IS_DIRSYNC(inode))
	249	exfat_sync_inode(inode);
	250	else
	251	mark_inode_dirty(inode);
	252
	253	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
	254	~(sbi->cluster_size - 1)) >> inode->i_blkbits;
	255	write_size:
	256	aligned_size = i_size_read(inode);
	257	if (aligned_size & (blocksize - 1)) {
	258	aligned_size \|= (blocksize - 1);
	259	aligned_size++;
	260	}
	261
	262	if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
	263	EXFAT_I(inode)->i_size_ondisk = aligned_size;
	264
	265	if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
	266	EXFAT_I(inode)->i_size_aligned = aligned_size;
	267	mutex_unlock(&sbi->s_lock);
	268	}
	269
	270	int exfat_getattr(const struct path path, struct kstat stat,
	271	unsigned int request_mask, unsigned int query_flags)
	272	{
	273	struct inode *inode = d_backing_inode(path->dentry);
	274	struct exfat_inode_info *ei = EXFAT_I(inode);
	275
	276	generic_fillattr(inode, stat);
81df1ad4	277	exfat_truncate_atime(&stat->atime);
98d91704 NJ	278	stat->result_mask \|= STATX_BTIME;
	279	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	280	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	281	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	282	return 0;
	283	}
	284
	285	int exfat_setattr(struct dentry dentry, struct iattr attr)
	286	{
	287	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	288	struct inode *inode = dentry->d_inode;
	289	unsigned int ia_valid;
	290	int error;
	291
	292	if ((attr->ia_valid & ATTR_SIZE) &&
	293	attr->ia_size > i_size_read(inode)) {
	294	error = exfat_cont_expand(inode, attr->ia_size);
	295	if (error \|\| attr->ia_valid == ATTR_SIZE)
	296	return error;
	297	attr->ia_valid &= ~ATTR_SIZE;
	298	}
	299
	300	/* Check for setting the inode time. */
	301	ia_valid = attr->ia_valid;
	302	if ((ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET \| ATTR_TIMES_SET)) &&
	303	exfat_allow_set_time(sbi, inode)) {
	304	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET \|
	305	ATTR_TIMES_SET);
	306	}
	307
2f221d6f	308	error = setattr_prepare(&init_user_ns, dentry, attr);
98d91704 NJ	309	attr->ia_valid = ia_valid;
	310	if (error)
	311	goto out;
	312
	313	if (((attr->ia_valid & ATTR_UID) &&
	314	!uid_eq(attr->ia_uid, sbi->options.fs_uid)) \|\|
	315	((attr->ia_valid & ATTR_GID) &&
	316	!gid_eq(attr->ia_gid, sbi->options.fs_gid)) \|\|
	317	((attr->ia_valid & ATTR_MODE) &&
	318	(attr->ia_mode & ~(S_IFREG \| S_IFLNK \| S_IFDIR \| 0777)))) {
	319	error = -EPERM;
	320	goto out;
	321	}
	322
	323	/*
	324	* We don't return -EPERM here. Yes, strange, but this is too
	325	* old behavior.
	326	*/
	327	if (attr->ia_valid & ATTR_MODE) {
	328	if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	329	attr->ia_valid &= ~ATTR_MODE;
	330	}
	331
	332	if (attr->ia_valid & ATTR_SIZE) {
	333	error = exfat_block_truncate_page(inode, attr->ia_size);
	334	if (error)
	335	goto out;
	336
	337	down_write(&EXFAT_I(inode)->truncate_lock);
	338	truncate_setsize(inode, attr->ia_size);
	339	exfat_truncate(inode, attr->ia_size);
	340	up_write(&EXFAT_I(inode)->truncate_lock);
	341	}
	342
2f221d6f	343	setattr_copy(&init_user_ns, inode, attr);
81df1ad4	344	exfat_truncate_atime(&inode->i_atime);
98d91704 NJ	345	mark_inode_dirty(inode);
	346
	347	out:
	348	return error;
	349	}
	350
5267456e SS	351	int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
	352	{
	353	struct inode *inode = filp->f_mapping->host;
	354	int err;
	355
	356	err = __generic_file_fsync(filp, start, end, datasync);
	357	if (err)
	358	return err;
	359
	360	err = sync_blockdev(inode->i_sb->s_bdev);
	361	if (err)
	362	return err;
	363
	364	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
	365	}
	366
98d91704	367	const struct file_operations exfat_file_operations = {
03577948 ES	368	.llseek = generic_file_llseek,
	369	.read_iter = generic_file_read_iter,
	370	.write_iter = generic_file_write_iter,
	371	.mmap = generic_file_mmap,
5267456e	372	.fsync = exfat_file_fsync,
03577948 ES	373	.splice_read = generic_file_splice_read,
03577948 ES	374	.splice_write = iter_file_splice_write,
98d91704 NJ	375	};
	376
	377	const struct inode_operations exfat_file_inode_operations = {
	378	.setattr = exfat_setattr,
	379	.getattr = exfat_getattr,
	380	};