[mirror_ubuntu-jammy-kernel.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, 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(struct user_namespace *mnt_uerns, 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(&init_user_ns, 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 user_namespace *mnt_userns, 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;
}

static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
{
	struct request_queue *q = bdev_get_queue(inode->i_sb->s_bdev);
	struct fstrim_range range;
	int ret = 0;

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

	if (!blk_queue_discard(q))
		return -EOPNOTSUPP;

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

	range.minlen = max_t(unsigned int, range.minlen,
				q->limits.discard_granularity);

	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 */
96	int __exfat_truncate(struct inode *inode, loff_t new_size)
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	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
7018ec68	110	exfat_set_volume_dirty(sb);
98d91704 NJ	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;
943af1fd TK	156	struct exfat_dentry ep, ep2;
943af1fd TK	157	struct exfat_entry_set_cache *es;
8b0c4717	158	int err;
98d91704 NJ	159
98d91704 NJ	160	es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
943af1fd	161	ES_ALL_ENTRIES);
98d91704 NJ	162	if (!es)
98d91704 NJ	163	return -EIO;
943af1fd TK	164	ep = exfat_get_dentry_cached(es, 0);
943af1fd TK	165	ep2 = exfat_get_dentry_cached(es, 1);
98d91704 NJ	166
	167	ts = current_time(inode);
	168	exfat_set_entry_time(sbi, &ts,
	169	&ep->dentry.file.modify_tz,
	170	&ep->dentry.file.modify_time,
	171	&ep->dentry.file.modify_date,
ed0f84d3	172	&ep->dentry.file.modify_time_cs);
98d91704 NJ	173	ep->dentry.file.attr = cpu_to_le16(ei->attr);
	174
	175	/* File size should be zero if there is no cluster allocated */
	176	if (ei->start_clu == EXFAT_EOF_CLUSTER) {
29bbb14b NJ	177	ep2->dentry.stream.valid_size = 0;
29bbb14b NJ	178	ep2->dentry.stream.size = 0;
98d91704	179	} else {
29bbb14b	180	ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
41e3928f	181	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
98d91704 NJ	182	}
	183
	184	if (new_size == 0) {
	185	/* Any directory can not be truncated to zero */
	186	WARN_ON(ei->type != TYPE_FILE);
	187
	188	ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
	189	ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
	190	}
	191
943af1fd	192	exfat_update_dir_chksum_with_entry_set(es);
8b0c4717 TK	193	err = exfat_free_dentry_set(es, inode_needs_sync(inode));
	194	if (err)
	195	return err;
98d91704 NJ	196	}
	197
	198	/* cut off from the FAT chain */
	199	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
	200	last_clu != EXFAT_EOF_CLUSTER) {
	201	if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
	202	return -EIO;
	203	}
	204
	205	/* invalidate cache and free the clusters */
	206	/* clear exfat cache */
	207	exfat_cache_inval_inode(inode);
	208
	209	/* hint information */
	210	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	211	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
98d91704 NJ	212
	213	/* hint_stat will be used if this is directory. */
	214	ei->hint_stat.eidx = 0;
	215	ei->hint_stat.clu = ei->start_clu;
	216	ei->hint_femp.eidx = EXFAT_HINT_NONE;
	217
	218	/* free the clusters */
	219	if (exfat_free_cluster(inode, &clu))
	220	return -EIO;
	221
7018ec68	222	exfat_clear_volume_dirty(sb);
98d91704 NJ	223
	224	return 0;
	225	}
	226
	227	void exfat_truncate(struct inode *inode, loff_t size)
	228	{
	229	struct super_block *sb = inode->i_sb;
	230	struct exfat_sb_info *sbi = EXFAT_SB(sb);
45882a6a	231	unsigned int blocksize = i_blocksize(inode);
98d91704 NJ	232	loff_t aligned_size;
	233	int err;
	234
	235	mutex_lock(&sbi->s_lock);
	236	if (EXFAT_I(inode)->start_clu == 0) {
	237	/*
	238	* Empty start_clu != ~0 (not allocated)
	239	*/
	240	exfat_fs_error(sb, "tried to truncate zeroed cluster.");
	241	goto write_size;
	242	}
	243
	244	err = __exfat_truncate(inode, i_size_read(inode));
	245	if (err)
	246	goto write_size;
	247
	248	inode->i_ctime = inode->i_mtime = current_time(inode);
	249	if (IS_DIRSYNC(inode))
	250	exfat_sync_inode(inode);
	251	else
	252	mark_inode_dirty(inode);
	253
	254	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
	255	~(sbi->cluster_size - 1)) >> inode->i_blkbits;
	256	write_size:
	257	aligned_size = i_size_read(inode);
	258	if (aligned_size & (blocksize - 1)) {
	259	aligned_size \|= (blocksize - 1);
	260	aligned_size++;
	261	}
	262
	263	if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
	264	EXFAT_I(inode)->i_size_ondisk = aligned_size;
	265
	266	if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
	267	EXFAT_I(inode)->i_size_aligned = aligned_size;
	268	mutex_unlock(&sbi->s_lock);
	269	}
	270
549c7297 CB	271	int exfat_getattr(struct user_namespace mnt_uerns, const struct path path,
	272	struct kstat *stat, unsigned int request_mask,
	273	unsigned int query_flags)
98d91704 NJ	274	{
	275	struct inode *inode = d_backing_inode(path->dentry);
	276	struct exfat_inode_info *ei = EXFAT_I(inode);
	277
0d56a451	278	generic_fillattr(&init_user_ns, inode, stat);
81df1ad4	279	exfat_truncate_atime(&stat->atime);
98d91704 NJ	280	stat->result_mask \|= STATX_BTIME;
	281	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	282	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	283	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	284	return 0;
	285	}
	286
549c7297 CB	287	int exfat_setattr(struct user_namespace mnt_userns, struct dentry dentry,
549c7297 CB	288	struct iattr *attr)
98d91704 NJ	289	{
	290	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	291	struct inode *inode = dentry->d_inode;
	292	unsigned int ia_valid;
	293	int error;
	294
	295	if ((attr->ia_valid & ATTR_SIZE) &&
	296	attr->ia_size > i_size_read(inode)) {
	297	error = exfat_cont_expand(inode, attr->ia_size);
	298	if (error \|\| attr->ia_valid == ATTR_SIZE)
	299	return error;
	300	attr->ia_valid &= ~ATTR_SIZE;
	301	}
	302
	303	/* Check for setting the inode time. */
	304	ia_valid = attr->ia_valid;
	305	if ((ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET \| ATTR_TIMES_SET)) &&
	306	exfat_allow_set_time(sbi, inode)) {
	307	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET \|
	308	ATTR_TIMES_SET);
	309	}
	310
2f221d6f	311	error = setattr_prepare(&init_user_ns, dentry, attr);
98d91704 NJ	312	attr->ia_valid = ia_valid;
	313	if (error)
	314	goto out;
	315
	316	if (((attr->ia_valid & ATTR_UID) &&
	317	!uid_eq(attr->ia_uid, sbi->options.fs_uid)) \|\|
	318	((attr->ia_valid & ATTR_GID) &&
	319	!gid_eq(attr->ia_gid, sbi->options.fs_gid)) \|\|
	320	((attr->ia_valid & ATTR_MODE) &&
	321	(attr->ia_mode & ~(S_IFREG \| S_IFLNK \| S_IFDIR \| 0777)))) {
	322	error = -EPERM;
	323	goto out;
	324	}
	325
	326	/*
	327	* We don't return -EPERM here. Yes, strange, but this is too
	328	* old behavior.
	329	*/
	330	if (attr->ia_valid & ATTR_MODE) {
	331	if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	332	attr->ia_valid &= ~ATTR_MODE;
	333	}
	334
	335	if (attr->ia_valid & ATTR_SIZE) {
	336	error = exfat_block_truncate_page(inode, attr->ia_size);
	337	if (error)
	338	goto out;
	339
	340	down_write(&EXFAT_I(inode)->truncate_lock);
	341	truncate_setsize(inode, attr->ia_size);
	342	exfat_truncate(inode, attr->ia_size);
	343	up_write(&EXFAT_I(inode)->truncate_lock);
	344	}
	345
2f221d6f	346	setattr_copy(&init_user_ns, inode, attr);
81df1ad4	347	exfat_truncate_atime(&inode->i_atime);
98d91704 NJ	348	mark_inode_dirty(inode);
	349
	350	out:
	351	return error;
	352	}
	353
654762df HK	354	static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
	355	{
	356	struct request_queue *q = bdev_get_queue(inode->i_sb->s_bdev);
	357	struct fstrim_range range;
	358	int ret = 0;
	359
	360	if (!capable(CAP_SYS_ADMIN))
	361	return -EPERM;
	362
	363	if (!blk_queue_discard(q))
	364	return -EOPNOTSUPP;
	365
	366	if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
	367	return -EFAULT;
	368
	369	range.minlen = max_t(unsigned int, range.minlen,
	370	q->limits.discard_granularity);
	371
	372	ret = exfat_trim_fs(inode, &range);
	373	if (ret < 0)
	374	return ret;
	375
	376	if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
	377	return -EFAULT;
	378
	379	return 0;
	380	}
	381
	382	long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	383	{
	384	struct inode *inode = file_inode(filp);
	385
	386	switch (cmd) {
	387	case FITRIM:
	388	return exfat_ioctl_fitrim(inode, arg);
	389	default:
	390	return -ENOTTY;
	391	}
	392	}
	393
	394	#ifdef CONFIG_COMPAT
	395	long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
	396	unsigned long arg)
	397	{
	398	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
	399	}
	400	#endif
	401
5267456e SS	402	int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
	403	{
	404	struct inode *inode = filp->f_mapping->host;
	405	int err;
	406
	407	err = __generic_file_fsync(filp, start, end, datasync);
	408	if (err)
	409	return err;
	410
	411	err = sync_blockdev(inode->i_sb->s_bdev);
	412	if (err)
	413	return err;
	414
c6bf3f0e	415	return blkdev_issue_flush(inode->i_sb->s_bdev);
5267456e SS	416	}
5267456e SS	417
98d91704	418	const struct file_operations exfat_file_operations = {
03577948 ES	419	.llseek = generic_file_llseek,
	420	.read_iter = generic_file_read_iter,
	421	.write_iter = generic_file_write_iter,
654762df HK	422	.unlocked_ioctl = exfat_ioctl,
	423	#ifdef CONFIG_COMPAT
	424	.compat_ioctl = exfat_compat_ioctl,
	425	#endif
03577948	426	.mmap = generic_file_mmap,
5267456e	427	.fsync = exfat_file_fsync,
03577948 ES	428	.splice_read = generic_file_splice_read,
03577948 ES	429	.splice_write = iter_file_splice_write,
98d91704 NJ	430	};
	431
	432	const struct inode_operations exfat_file_inode_operations = {
	433	.setattr = exfat_setattr,
	434	.getattr = exfat_getattr,
	435	};