[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/compat.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)
{
	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);

	/* 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(ei->i_size_ondisk, sbi);

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

	if (i_size_read(inode) > 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;
	}

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

	/*
	 * update the directory entry
	 *
	 * If the directory entry is updated by mark_inode_dirty(), the
	 * directory entry will be written after a writeback cycle of
	 * updating the bitmap/FAT, which may result in clusters being
	 * freed but referenced by the directory entry in the event of a
	 * sudden power failure.
	 * __exfat_write_inode() is called for directory entry, bitmap
	 * and FAT to be written in a same writeback.
	 */
	if (__exfat_write_inode(inode, inode_needs_sync(inode)))
		return -EIO;

	/* 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;

	return 0;
}

void exfat_truncate(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	unsigned int blocksize = i_blocksize(inode);
	loff_t aligned_size;
	int err;

	mutex_lock(&sbi->s_lock);
	if (ei->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);
	if (err)
		goto write_size;

	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
write_size:
	aligned_size = i_size_read(inode);
	if (aligned_size & (blocksize - 1)) {
		aligned_size |= (blocksize - 1);
		aligned_size++;
	}

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

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

int exfat_getattr(struct mnt_idmap *idmap, 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(&nop_mnt_idmap, 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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)
		inode->i_mtime = inode->i_ctime = current_time(inode);

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

	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_write_inode() is called from exfat_truncate(), inode
		 * is already written by it, so mark_inode_dirty() is unneeded.
		 */
		exfat_truncate(inode);
		up_write(&EXFAT_I(inode)->truncate_lock);
	} else
		mark_inode_dirty(inode);

out:
	return error;
}

static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
{
	struct fstrim_range range;
	int ret = 0;

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

	if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
		return -EOPNOTSUPP;

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

	range.minlen = max_t(unsigned int, range.minlen,
				bdev_discard_granularity(inode->i_sb->s_bdev));

	ret = exfat_trim_fs(inode, &range);
	if (ret < 0)
		return ret;

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

	return 0;
}

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

	switch (cmd) {
	case FITRIM:
		return exfat_ioctl_fitrim(inode, arg);
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
				unsigned long arg)
{
	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif

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);
}

const struct file_operations exfat_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.unlocked_ioctl = exfat_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = exfat_compat_ioctl,
#endif
	.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>
654762df	7	#include <linux/compat.h>
98d91704 NJ	8	#include <linux/cred.h>
98d91704 NJ	9	#include <linux/buffer_head.h>
5267456e	10	#include <linux/blkdev.h>
98d91704 NJ	11
	12	#include "exfat_raw.h"
	13	#include "exfat_fs.h"
	14
	15	static int exfat_cont_expand(struct inode *inode, loff_t size)
	16	{
	17	struct address_space *mapping = inode->i_mapping;
	18	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
	19	int err, err2;
	20
	21	err = generic_cont_expand_simple(inode, size);
	22	if (err)
	23	return err;
	24
	25	inode->i_ctime = inode->i_mtime = current_time(inode);
	26	mark_inode_dirty(inode);
	27
	28	if (!IS_SYNC(inode))
	29	return 0;
	30
	31	err = filemap_fdatawrite_range(mapping, start, start + count - 1);
	32	err2 = sync_mapping_buffers(mapping);
	33	if (!err)
	34	err = err2;
	35	err2 = write_inode_now(inode, 1);
	36	if (!err)
	37	err = err2;
	38	if (err)
	39	return err;
	40
	41	return filemap_fdatawait_range(mapping, start, start + count - 1);
	42	}
	43
	44	static bool exfat_allow_set_time(struct exfat_sb_info sbi, struct inode inode)
	45	{
	46	mode_t allow_utime = sbi->options.allow_utime;
	47
	48	if (!uid_eq(current_fsuid(), inode->i_uid)) {
	49	if (in_group_p(inode->i_gid))
	50	allow_utime >>= 3;
	51	if (allow_utime & MAY_WRITE)
	52	return true;
	53	}
	54
	55	/* use a default check */
	56	return false;
	57	}
	58
	59	static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
	60	struct inode inode, umode_t mode_ptr)
	61	{
	62	mode_t i_mode, mask, perm;
	63
	64	i_mode = inode->i_mode;
	65
	66	mask = (S_ISREG(i_mode) \|\| S_ISLNK(i_mode)) ?
	67	sbi->options.fs_fmask : sbi->options.fs_dmask;
	68	perm = *mode_ptr & ~(S_IFMT \| mask);
	69
	70	/* Of the r and x bits, all (subject to umask) must be present.*/
	71	if ((perm & 0555) != (i_mode & 0555))
	72	return -EPERM;
	73
	74	if (exfat_mode_can_hold_ro(inode)) {
75	/*
76	* Of the w bits, either all (subject to umask) or none must
77	* be present.
78	*/
79	if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
80	return -EPERM;
81	} else {
82	/*
83	* If exfat_mode_can_hold_ro(inode) is false, can't change
84	* w bits.
85	*/
86	if ((perm & 0222) != (0222 & ~mask))
87	return -EPERM;
88	}
89
90	*mode_ptr &= S_IFMT \| perm;
91
92	return 0;
93	}
94
95	/* resize the file length */
f7cde967	96	int __exfat_truncate(struct inode *inode)
98d91704 NJ	97	{
	98	unsigned int num_clusters_new, num_clusters_phys;
	99	unsigned int last_clu = EXFAT_FREE_CLUSTER;
	100	struct exfat_chain clu;
98d91704 NJ	101	struct super_block *sb = inode->i_sb;
	102	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	103	struct exfat_inode_info *ei = EXFAT_I(inode);
98d91704 NJ	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
98d91704 NJ	111	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
7dee6f57	112	num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
98d91704 NJ	113
	114	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
	115
f7cde967	116	if (i_size_read(inode) > 0) {
98d91704 NJ	117	/*
	118	* Truncate FAT chain num_clusters after the first cluster
	119	* num_clusters = min(new, phys);
	120	*/
	121	unsigned int num_clusters =
	122	min(num_clusters_new, num_clusters_phys);
	123
	124	/*
	125	* Follow FAT chain
	126	* (defensive coding - works fine even with corrupted FAT table
	127	*/
	128	if (clu.flags == ALLOC_NO_FAT_CHAIN) {
	129	clu.dir += num_clusters;
	130	clu.size -= num_clusters;
	131	} else {
	132	while (num_clusters > 0) {
	133	last_clu = clu.dir;
	134	if (exfat_get_next_cluster(sb, &(clu.dir)))
	135	return -EIO;
	136
	137	num_clusters--;
	138	clu.size--;
	139	}
	140	}
	141	} else {
	142	ei->flags = ALLOC_NO_FAT_CHAIN;
	143	ei->start_clu = EXFAT_EOF_CLUSTER;
	144	}
	145
98d91704 NJ	146	if (ei->type == TYPE_FILE)
	147	ei->attr \|= ATTR_ARCHIVE;
	148
4493895b YM	149	/*
	150	* update the directory entry
	151	*
	152	* If the directory entry is updated by mark_inode_dirty(), the
	153	* directory entry will be written after a writeback cycle of
	154	* updating the bitmap/FAT, which may result in clusters being
	155	* freed but referenced by the directory entry in the event of a
	156	* sudden power failure.
	157	* __exfat_write_inode() is called for directory entry, bitmap
	158	* and FAT to be written in a same writeback.
	159	*/
23e6e1c9 YM	160	if (__exfat_write_inode(inode, inode_needs_sync(inode)))
23e6e1c9 YM	161	return -EIO;
98d91704 NJ	162
	163	/* cut off from the FAT chain */
	164	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
	165	last_clu != EXFAT_EOF_CLUSTER) {
	166	if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
	167	return -EIO;
	168	}
	169
	170	/* invalidate cache and free the clusters */
	171	/* clear exfat cache */
	172	exfat_cache_inval_inode(inode);
	173
	174	/* hint information */
	175	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	176	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
98d91704 NJ	177
	178	/* hint_stat will be used if this is directory. */
	179	ei->hint_stat.eidx = 0;
	180	ei->hint_stat.clu = ei->start_clu;
	181	ei->hint_femp.eidx = EXFAT_HINT_NONE;
	182
	183	/* free the clusters */
	184	if (exfat_free_cluster(inode, &clu))
	185	return -EIO;
	186
98d91704 NJ	187	return 0;
	188	}
	189
e981917b	190	void exfat_truncate(struct inode *inode)
98d91704 NJ	191	{
	192	struct super_block *sb = inode->i_sb;
	193	struct exfat_sb_info *sbi = EXFAT_SB(sb);
7dee6f57	194	struct exfat_inode_info *ei = EXFAT_I(inode);
45882a6a	195	unsigned int blocksize = i_blocksize(inode);
98d91704 NJ	196	loff_t aligned_size;
	197	int err;
	198
	199	mutex_lock(&sbi->s_lock);
7dee6f57	200	if (ei->start_clu == 0) {
98d91704 NJ	201	/*
	202	* Empty start_clu != ~0 (not allocated)
	203	*/
	204	exfat_fs_error(sb, "tried to truncate zeroed cluster.");
	205	goto write_size;
	206	}
	207
f7cde967	208	err = __exfat_truncate(inode);
98d91704 NJ	209	if (err)
	210	goto write_size;
	211
39c1ce8e	212	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
98d91704 NJ	213	write_size:
	214	aligned_size = i_size_read(inode);
	215	if (aligned_size & (blocksize - 1)) {
	216	aligned_size \|= (blocksize - 1);
	217	aligned_size++;
	218	}
	219
7dee6f57 CVB	220	if (ei->i_size_ondisk > i_size_read(inode))
7dee6f57 CVB	221	ei->i_size_ondisk = aligned_size;
98d91704	222
7dee6f57 CVB	223	if (ei->i_size_aligned > i_size_read(inode))
7dee6f57 CVB	224	ei->i_size_aligned = aligned_size;
98d91704 NJ	225	mutex_unlock(&sbi->s_lock);
	226	}
	227
b74d24f7	228	int exfat_getattr(struct mnt_idmap idmap, const struct path path,
549c7297 CB	229	struct kstat *stat, unsigned int request_mask,
549c7297 CB	230	unsigned int query_flags)
98d91704 NJ	231	{
	232	struct inode *inode = d_backing_inode(path->dentry);
	233	struct exfat_inode_info *ei = EXFAT_I(inode);
	234
b74d24f7	235	generic_fillattr(&nop_mnt_idmap, inode, stat);
81df1ad4	236	exfat_truncate_atime(&stat->atime);
98d91704 NJ	237	stat->result_mask \|= STATX_BTIME;
	238	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	239	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	240	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	241	return 0;
	242	}
	243
c1632a0f	244	int exfat_setattr(struct mnt_idmap idmap, struct dentry dentry,
549c7297	245	struct iattr *attr)
98d91704 NJ	246	{
	247	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	248	struct inode *inode = dentry->d_inode;
	249	unsigned int ia_valid;
	250	int error;
	251
	252	if ((attr->ia_valid & ATTR_SIZE) &&
	253	attr->ia_size > i_size_read(inode)) {
	254	error = exfat_cont_expand(inode, attr->ia_size);
	255	if (error \|\| attr->ia_valid == ATTR_SIZE)
	256	return error;
	257	attr->ia_valid &= ~ATTR_SIZE;
	258	}
	259
	260	/* Check for setting the inode time. */
	261	ia_valid = attr->ia_valid;
	262	if ((ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET \| ATTR_TIMES_SET)) &&
	263	exfat_allow_set_time(sbi, inode)) {
	264	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET \|
	265	ATTR_TIMES_SET);
	266	}
	267
c1632a0f	268	error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
98d91704 NJ	269	attr->ia_valid = ia_valid;
	270	if (error)
	271	goto out;
	272
	273	if (((attr->ia_valid & ATTR_UID) &&
	274	!uid_eq(attr->ia_uid, sbi->options.fs_uid)) \|\|
	275	((attr->ia_valid & ATTR_GID) &&
	276	!gid_eq(attr->ia_gid, sbi->options.fs_gid)) \|\|
	277	((attr->ia_valid & ATTR_MODE) &&
	278	(attr->ia_mode & ~(S_IFREG \| S_IFLNK \| S_IFDIR \| 0777)))) {
	279	error = -EPERM;
	280	goto out;
	281	}
	282
	283	/*
	284	* We don't return -EPERM here. Yes, strange, but this is too
	285	* old behavior.
	286	*/
	287	if (attr->ia_valid & ATTR_MODE) {
	288	if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	289	attr->ia_valid &= ~ATTR_MODE;
	290	}
	291
4493895b YM	292	if (attr->ia_valid & ATTR_SIZE)
	293	inode->i_mtime = inode->i_ctime = current_time(inode);
	294
c1632a0f	295	setattr_copy(&nop_mnt_idmap, inode, attr);
4493895b YM	296	exfat_truncate_atime(&inode->i_atime);
4493895b YM	297
98d91704 NJ	298	if (attr->ia_valid & ATTR_SIZE) {
	299	error = exfat_block_truncate_page(inode, attr->ia_size);
	300	if (error)
	301	goto out;
	302
	303	down_write(&EXFAT_I(inode)->truncate_lock);
	304	truncate_setsize(inode, attr->ia_size);
4493895b YM	305
	306	/*
	307	* __exfat_write_inode() is called from exfat_truncate(), inode
	308	* is already written by it, so mark_inode_dirty() is unneeded.
	309	*/
e981917b	310	exfat_truncate(inode);
98d91704	311	up_write(&EXFAT_I(inode)->truncate_lock);
4493895b YM	312	} else
4493895b YM	313	mark_inode_dirty(inode);
98d91704 NJ	314
	315	out:
	316	return error;
	317	}
	318
654762df HK	319	static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
654762df HK	320	{
654762df HK	321	struct fstrim_range range;
	322	int ret = 0;
	323
	324	if (!capable(CAP_SYS_ADMIN))
	325	return -EPERM;
	326
70200574	327	if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
654762df HK	328	return -EOPNOTSUPP;
	329
	330	if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
	331	return -EFAULT;
	332
	333	range.minlen = max_t(unsigned int, range.minlen,
7b47ef52	334	bdev_discard_granularity(inode->i_sb->s_bdev));
654762df HK	335
	336	ret = exfat_trim_fs(inode, &range);
	337	if (ret < 0)
	338	return ret;
	339
	340	if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
	341	return -EFAULT;
	342
	343	return 0;
	344	}
	345
	346	long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	347	{
	348	struct inode *inode = file_inode(filp);
	349
	350	switch (cmd) {
	351	case FITRIM:
	352	return exfat_ioctl_fitrim(inode, arg);
	353	default:
	354	return -ENOTTY;
	355	}
	356	}
	357
	358	#ifdef CONFIG_COMPAT
	359	long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
	360	unsigned long arg)
	361	{
	362	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
	363	}
	364	#endif
	365
5267456e SS	366	int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
	367	{
	368	struct inode *inode = filp->f_mapping->host;
	369	int err;
	370
	371	err = __generic_file_fsync(filp, start, end, datasync);
	372	if (err)
	373	return err;
	374
	375	err = sync_blockdev(inode->i_sb->s_bdev);
	376	if (err)
	377	return err;
	378
c6bf3f0e	379	return blkdev_issue_flush(inode->i_sb->s_bdev);
5267456e SS	380	}
5267456e SS	381
98d91704	382	const struct file_operations exfat_file_operations = {
03577948 ES	383	.llseek = generic_file_llseek,
	384	.read_iter = generic_file_read_iter,
	385	.write_iter = generic_file_write_iter,
654762df HK	386	.unlocked_ioctl = exfat_ioctl,
	387	#ifdef CONFIG_COMPAT
	388	.compat_ioctl = exfat_compat_ioctl,
	389	#endif
03577948	390	.mmap = generic_file_mmap,
5267456e	391	.fsync = exfat_file_fsync,
03577948 ES	392	.splice_read = generic_file_splice_read,
03577948 ES	393	.splice_write = iter_file_splice_write,
98d91704 NJ	394	};
	395
	396	const struct inode_operations exfat_file_inode_operations = {
	397	.setattr = exfat_setattr,
	398	.getattr = exfat_getattr,
	399	};