[mirror_ubuntu-bionic-kernel.git] / fs / fat / file.c

/*
 *  linux/fs/fat/file.c
 *
 *  Written 1992,1993 by Werner Almesberger
 *
 *  regular file handling primitives for fat-based filesystems
 */

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/time.h>
#include <linux/msdos_fs.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/blkdev.h>

int fat_generic_ioctl(struct inode *inode, struct file *filp,
		      unsigned int cmd, unsigned long arg)
{
	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
	u32 __user *user_attr = (u32 __user *)arg;

	switch (cmd) {
	case FAT_IOCTL_GET_ATTRIBUTES:
	{
		u32 attr;

		if (inode->i_ino == MSDOS_ROOT_INO)
			attr = ATTR_DIR;
		else
			attr = fat_attr(inode);

		return put_user(attr, user_attr);
	}
	case FAT_IOCTL_SET_ATTRIBUTES:
	{
		u32 attr, oldattr;
		int err, is_dir = S_ISDIR(inode->i_mode);
		struct iattr ia;

		err = get_user(attr, user_attr);
		if (err)
			return err;

		mutex_lock(&inode->i_mutex);

		err = mnt_want_write(filp->f_path.mnt);
		if (err)
			goto up_no_drop_write;

		/*
		 * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
		 * prevents the user from turning us into a VFAT
		 * longname entry.  Also, we obviously can't set
		 * any of the NTFS attributes in the high 24 bits.
		 */
		attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
		/* Merge in ATTR_VOLUME and ATTR_DIR */
		attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
			(is_dir ? ATTR_DIR : 0);
		oldattr = fat_attr(inode);

		/* Equivalent to a chmod() */
		ia.ia_valid = ATTR_MODE | ATTR_CTIME;
		if (is_dir) {
			ia.ia_mode = MSDOS_MKMODE(attr,
				S_IRWXUGO & ~sbi->options.fs_dmask)
				| S_IFDIR;
		} else {
			ia.ia_mode = MSDOS_MKMODE(attr,
				(S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO))
				& ~sbi->options.fs_fmask)
				| S_IFREG;
		}

		/* The root directory has no attributes */
		if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
			err = -EINVAL;
			goto up;
		}

		if (sbi->options.sys_immutable) {
			if ((attr | oldattr) & ATTR_SYS) {
				if (!capable(CAP_LINUX_IMMUTABLE)) {
					err = -EPERM;
					goto up;
				}
			}
		}

		/* This MUST be done before doing anything irreversible... */
		err = notify_change(filp->f_path.dentry, &ia);
		if (err)
			goto up;

		if (sbi->options.sys_immutable) {
			if (attr & ATTR_SYS)
				inode->i_flags |= S_IMMUTABLE;
			else
				inode->i_flags &= S_IMMUTABLE;
		}

		MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
		mark_inode_dirty(inode);
up:
		mnt_drop_write(filp->f_path.mnt);
up_no_drop_write:
		mutex_unlock(&inode->i_mutex);
		return err;
	}
	default:
		return -ENOTTY;	/* Inappropriate ioctl for device */
	}
}

static int fat_file_release(struct inode *inode, struct file *filp)
{
	if ((filp->f_mode & FMODE_WRITE) &&
	     MSDOS_SB(inode->i_sb)->options.flush) {
		fat_flush_inodes(inode->i_sb, inode, NULL);
		congestion_wait(WRITE, HZ/10);
	}
	return 0;
}

const struct file_operations fat_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= generic_file_aio_write,
	.mmap		= generic_file_mmap,
	.release	= fat_file_release,
	.ioctl		= fat_generic_ioctl,
	.fsync		= file_fsync,
	.splice_read	= generic_file_splice_read,
};

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

	err = generic_cont_expand_simple(inode, size);
	if (err)
		goto out;

	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	if (IS_SYNC(inode))
		err = sync_page_range_nolock(inode, mapping, start, count);
out:
	return err;
}

/* Free all clusters after the skip'th cluster. */
static int fat_free(struct inode *inode, int skip)
{
	struct super_block *sb = inode->i_sb;
	int err, wait, free_start, i_start, i_logstart;

	if (MSDOS_I(inode)->i_start == 0)
		return 0;

	fat_cache_inval_inode(inode);

	wait = IS_DIRSYNC(inode);
	i_start = free_start = MSDOS_I(inode)->i_start;
	i_logstart = MSDOS_I(inode)->i_logstart;

	/* First, we write the new file size. */
	if (!skip) {
		MSDOS_I(inode)->i_start = 0;
		MSDOS_I(inode)->i_logstart = 0;
	}
	MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	if (wait) {
		err = fat_sync_inode(inode);
		if (err) {
			MSDOS_I(inode)->i_start = i_start;
			MSDOS_I(inode)->i_logstart = i_logstart;
			return err;
		}
	} else
		mark_inode_dirty(inode);

	/* Write a new EOF, and get the remaining cluster chain for freeing. */
	if (skip) {
		struct fat_entry fatent;
		int ret, fclus, dclus;

		ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
		if (ret < 0)
			return ret;
		else if (ret == FAT_ENT_EOF)
			return 0;

		fatent_init(&fatent);
		ret = fat_ent_read(inode, &fatent, dclus);
		if (ret == FAT_ENT_EOF) {
			fatent_brelse(&fatent);
			return 0;
		} else if (ret == FAT_ENT_FREE) {
			fat_fs_panic(sb,
				     "%s: invalid cluster chain (i_pos %lld)",
				     __func__, MSDOS_I(inode)->i_pos);
			ret = -EIO;
		} else if (ret > 0) {
			err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
			if (err)
				ret = err;
		}
		fatent_brelse(&fatent);
		if (ret < 0)
			return ret;

		free_start = ret;
	}
	inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);

	/* Freeing the remained cluster chain */
	return fat_free_clusters(inode, free_start);
}

void fat_truncate(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct msdos_sb_info *sbi = MSDOS_SB(sb);
	const unsigned int cluster_size = sbi->cluster_size;
	int nr_clusters;

	/*
	 * This protects against truncating a file bigger than it was then
	 * trying to write into the hole.
	 */
	if (MSDOS_I(inode)->mmu_private > inode->i_size)
		MSDOS_I(inode)->mmu_private = inode->i_size;

	nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits;

	lock_super(sb);
	fat_free(inode, nr_clusters);
	unlock_super(sb);
	fat_flush_inodes(inode->i_sb, inode, NULL);
}

int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	generic_fillattr(inode, stat);
	stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
	return 0;
}
EXPORT_SYMBOL_GPL(fat_getattr);

static int fat_check_mode(const struct msdos_sb_info *sbi, struct inode *inode,
			  mode_t mode)
{
	mode_t mask, req = mode & ~S_IFMT;

	if (S_ISREG(mode))
		mask = sbi->options.fs_fmask;
	else
		mask = sbi->options.fs_dmask;

	/*
	 * Of the r and x bits, all (subject to umask) must be present. Of the
	 * w bits, either all (subject to umask) or none must be present.
	 */
	req &= ~mask;
	if ((req & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
		return -EPERM;
	if ((req & S_IWUGO) && ((req & S_IWUGO) != (S_IWUGO & ~mask)))
		return -EPERM;

	return 0;
}

static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
{
	mode_t allow_utime = sbi->options.allow_utime;

	if (current->fsuid != inode->i_uid) {
		if (in_group_p(inode->i_gid))
			allow_utime >>= 3;
		if (allow_utime & MAY_WRITE)
			return 1;
	}

	/* use a default check */
	return 0;
}

int fat_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct super_block *sb = dentry->d_sb;
	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
	struct inode *inode = dentry->d_inode;
	int mask, error = 0;
	unsigned int ia_valid;

	lock_super(sb);

	/*
	 * Expand the file. Since inode_setattr() updates ->i_size
	 * before calling the ->truncate(), but FAT needs to fill the
	 * hole before it.
	 */
	if (attr->ia_valid & ATTR_SIZE) {
		if (attr->ia_size > inode->i_size) {
			error = fat_cont_expand(inode, attr->ia_size);
			if (error || attr->ia_valid == ATTR_SIZE)
				goto out;
			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)) {
		if (fat_allow_set_time(sbi, inode))
			attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
	}

	error = inode_change_ok(inode, attr);
	attr->ia_valid = ia_valid;
	if (error) {
		if (sbi->options.quiet)
			error = 0;
		goto out;
	}
	if (((attr->ia_valid & ATTR_UID) &&
	     (attr->ia_uid != sbi->options.fs_uid)) ||
	    ((attr->ia_valid & ATTR_GID) &&
	     (attr->ia_gid != sbi->options.fs_gid)) ||
	    ((attr->ia_valid & ATTR_MODE) &&
	     fat_check_mode(sbi, inode, attr->ia_mode) < 0))
		error = -EPERM;

	if (error) {
		if (sbi->options.quiet)
			error = 0;
		goto out;
	}

	error = inode_setattr(inode, attr);
	if (error)
		goto out;

	if (S_ISDIR(inode->i_mode))
		mask = sbi->options.fs_dmask;
	else
		mask = sbi->options.fs_fmask;
	inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
out:
	unlock_super(sb);
	return error;
}
EXPORT_SYMBOL_GPL(fat_setattr);

const struct inode_operations fat_file_inode_operations = {
	.truncate	= fat_truncate,
	.setattr	= fat_setattr,
	.getattr	= fat_getattr,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/fat/file.c
	3	*
	4	* Written 1992,1993 by Werner Almesberger
	5	*
	6	* regular file handling primitives for fat-based filesystems
	7	*/
	8
16f7e0fe	9	#include <linux/capability.h>
1da177e4	10	#include <linux/module.h>
42a74f20	11	#include <linux/mount.h>
1da177e4 LT	12	#include <linux/time.h>
	13	#include <linux/msdos_fs.h>
	14	#include <linux/smp_lock.h>
	15	#include <linux/buffer_head.h>
05eb0b51	16	#include <linux/writeback.h>
3fcfab16	17	#include <linux/backing-dev.h>
ae78bf9c	18	#include <linux/blkdev.h>
1da177e4	19
1da177e4 LT	20	int fat_generic_ioctl(struct inode inode, struct file filp,
	21	unsigned int cmd, unsigned long arg)
	22	{
	23	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
	24	u32 __user user_attr = (u32 __user )arg;
	25
	26	switch (cmd) {
	27	case FAT_IOCTL_GET_ATTRIBUTES:
	28	{
	29	u32 attr;
	30
	31	if (inode->i_ino == MSDOS_ROOT_INO)
	32	attr = ATTR_DIR;
	33	else
	34	attr = fat_attr(inode);
	35
	36	return put_user(attr, user_attr);
	37	}
	38	case FAT_IOCTL_SET_ATTRIBUTES:
	39	{
	40	u32 attr, oldattr;
	41	int err, is_dir = S_ISDIR(inode->i_mode);
	42	struct iattr ia;
	43
	44	err = get_user(attr, user_attr);
	45	if (err)
	46	return err;
	47
1b1dcc1b	48	mutex_lock(&inode->i_mutex);
1da177e4	49
42a74f20 DH	50	err = mnt_want_write(filp->f_path.mnt);
	51	if (err)
	52	goto up_no_drop_write;
1da177e4 LT	53
	54	/*
	55	* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
	56	* prevents the user from turning us into a VFAT
	57	* longname entry. Also, we obviously can't set
	58	* any of the NTFS attributes in the high 24 bits.
	59	*/
	60	attr &= 0xff & ~(ATTR_VOLUME \| ATTR_DIR);
	61	/* Merge in ATTR_VOLUME and ATTR_DIR */
	62	attr \|= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) \|
	63	(is_dir ? ATTR_DIR : 0);
	64	oldattr = fat_attr(inode);
	65
	66	/* Equivalent to a chmod() */
	67	ia.ia_valid = ATTR_MODE \| ATTR_CTIME;
	68	if (is_dir) {
	69	ia.ia_mode = MSDOS_MKMODE(attr,
	70	S_IRWXUGO & ~sbi->options.fs_dmask)
	71	\| S_IFDIR;
	72	} else {
	73	ia.ia_mode = MSDOS_MKMODE(attr,
	74	(S_IRUGO \| S_IWUGO \| (inode->i_mode & S_IXUGO))
	75	& ~sbi->options.fs_fmask)
	76	\| S_IFREG;
	77	}
	78
	79	/* The root directory has no attributes */
	80	if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
	81	err = -EINVAL;
	82	goto up;
	83	}
	84
	85	if (sbi->options.sys_immutable) {
	86	if ((attr \| oldattr) & ATTR_SYS) {
	87	if (!capable(CAP_LINUX_IMMUTABLE)) {
	88	err = -EPERM;
	89	goto up;
	90	}
	91	}
	92	}
	93
	94	/* This MUST be done before doing anything irreversible... */
dba32306	95	err = notify_change(filp->f_path.dentry, &ia);
1da177e4 LT	96	if (err)
	97	goto up;
	98
	99	if (sbi->options.sys_immutable) {
	100	if (attr & ATTR_SYS)
	101	inode->i_flags \|= S_IMMUTABLE;
	102	else
	103	inode->i_flags &= S_IMMUTABLE;
	104	}
	105
	106	MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
	107	mark_inode_dirty(inode);
42a74f20 DH	108	up:
	109	mnt_drop_write(filp->f_path.mnt);
	110	up_no_drop_write:
1b1dcc1b	111	mutex_unlock(&inode->i_mutex);
1da177e4 LT	112	return err;
	113	}
	114	default:
	115	return -ENOTTY; /* Inappropriate ioctl for device */
	116	}
	117	}
	118
ae78bf9c CM	119	static int fat_file_release(struct inode inode, struct file filp)
	120	{
	121	if ((filp->f_mode & FMODE_WRITE) &&
	122	MSDOS_SB(inode->i_sb)->options.flush) {
	123	fat_flush_inodes(inode->i_sb, inode, NULL);
3fcfab16	124	congestion_wait(WRITE, HZ/10);
ae78bf9c CM	125	}
	126	return 0;
	127	}
	128
4b6f5d20	129	const struct file_operations fat_file_operations = {
1da177e4 LT	130	.llseek = generic_file_llseek,
	131	.read = do_sync_read,
	132	.write = do_sync_write,
1da177e4	133	.aio_read = generic_file_aio_read,
ef402268	134	.aio_write = generic_file_aio_write,
1da177e4	135	.mmap = generic_file_mmap,
ae78bf9c	136	.release = fat_file_release,
1da177e4 LT	137	.ioctl = fat_generic_ioctl,
1da177e4 LT	138	.fsync = file_fsync,
5ffc4ef4	139	.splice_read = generic_file_splice_read,
1da177e4 LT	140	};
1da177e4 LT	141
05eb0b51 OH	142	static int fat_cont_expand(struct inode *inode, loff_t size)
	143	{
	144	struct address_space *mapping = inode->i_mapping;
	145	loff_t start = inode->i_size, count = size - inode->i_size;
	146	int err;
	147
	148	err = generic_cont_expand_simple(inode, size);
	149	if (err)
	150	goto out;
	151
	152	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	153	mark_inode_dirty(inode);
	154	if (IS_SYNC(inode))
	155	err = sync_page_range_nolock(inode, mapping, start, count);
	156	out:
	157	return err;
	158	}
	159
1da177e4 LT	160	/* Free all clusters after the skip'th cluster. */
	161	static int fat_free(struct inode *inode, int skip)
	162	{
	163	struct super_block *sb = inode->i_sb;
	164	int err, wait, free_start, i_start, i_logstart;
	165
	166	if (MSDOS_I(inode)->i_start == 0)
	167	return 0;
	168
3b641407 OH	169	fat_cache_inval_inode(inode);
3b641407 OH	170
1da177e4	171	wait = IS_DIRSYNC(inode);
3b641407 OH	172	i_start = free_start = MSDOS_I(inode)->i_start;
	173	i_logstart = MSDOS_I(inode)->i_logstart;
	174
	175	/* First, we write the new file size. */
	176	if (!skip) {
	177	MSDOS_I(inode)->i_start = 0;
	178	MSDOS_I(inode)->i_logstart = 0;
	179	}
	180	MSDOS_I(inode)->i_attrs \|= ATTR_ARCH;
	181	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	182	if (wait) {
	183	err = fat_sync_inode(inode);
	184	if (err) {
	185	MSDOS_I(inode)->i_start = i_start;
	186	MSDOS_I(inode)->i_logstart = i_logstart;
	187	return err;
	188	}
	189	} else
	190	mark_inode_dirty(inode);
	191
	192	/* Write a new EOF, and get the remaining cluster chain for freeing. */
1da177e4 LT	193	if (skip) {
	194	struct fat_entry fatent;
	195	int ret, fclus, dclus;
	196
	197	ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
	198	if (ret < 0)
	199	return ret;
	200	else if (ret == FAT_ENT_EOF)
	201	return 0;
	202
	203	fatent_init(&fatent);
	204	ret = fat_ent_read(inode, &fatent, dclus);
	205	if (ret == FAT_ENT_EOF) {
	206	fatent_brelse(&fatent);
	207	return 0;
	208	} else if (ret == FAT_ENT_FREE) {
	209	fat_fs_panic(sb,
	210	"%s: invalid cluster chain (i_pos %lld)",
8e24eea7	211	__func__, MSDOS_I(inode)->i_pos);
1da177e4 LT	212	ret = -EIO;
	213	} else if (ret > 0) {
	214	err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
	215	if (err)
	216	ret = err;
	217	}
	218	fatent_brelse(&fatent);
	219	if (ret < 0)
	220	return ret;
	221
	222	free_start = ret;
1da177e4	223	}
1da177e4 LT	224	inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
	225
	226	/* Freeing the remained cluster chain */
	227	return fat_free_clusters(inode, free_start);
1da177e4 LT	228	}
	229
	230	void fat_truncate(struct inode *inode)
	231	{
8f593427 LT	232	struct super_block *sb = inode->i_sb;
8f593427 LT	233	struct msdos_sb_info *sbi = MSDOS_SB(sb);
1da177e4 LT	234	const unsigned int cluster_size = sbi->cluster_size;
	235	int nr_clusters;
	236
	237	/*
	238	* This protects against truncating a file bigger than it was then
	239	* trying to write into the hole.
	240	*/
	241	if (MSDOS_I(inode)->mmu_private > inode->i_size)
	242	MSDOS_I(inode)->mmu_private = inode->i_size;
	243
	244	nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits;
	245
8f593427	246	lock_super(sb);
1da177e4	247	fat_free(inode, nr_clusters);
8f593427	248	unlock_super(sb);
ae78bf9c	249	fat_flush_inodes(inode->i_sb, inode, NULL);
1da177e4 LT	250	}
1da177e4 LT	251
da63fc7c OH	252	int fat_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	253	{
	254	struct inode *inode = dentry->d_inode;
	255	generic_fillattr(inode, stat);
	256	stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
	257	return 0;
	258	}
	259	EXPORT_SYMBOL_GPL(fat_getattr);
	260
e97e8de3 OH	261	static int fat_check_mode(const struct msdos_sb_info sbi, struct inode inode,
e97e8de3 OH	262	mode_t mode)
1278fdd3 OH	263	{
	264	mode_t mask, req = mode & ~S_IFMT;
	265
	266	if (S_ISREG(mode))
	267	mask = sbi->options.fs_fmask;
	268	else
	269	mask = sbi->options.fs_dmask;
	270
	271	/*
	272	* Of the r and x bits, all (subject to umask) must be present. Of the
	273	* w bits, either all (subject to umask) or none must be present.
	274	*/
	275	req &= ~mask;
e97e8de3	276	if ((req & (S_IRUGO \| S_IXUGO)) != (inode->i_mode & (S_IRUGO\|S_IXUGO)))
1278fdd3 OH	277	return -EPERM;
	278	if ((req & S_IWUGO) && ((req & S_IWUGO) != (S_IWUGO & ~mask)))
	279	return -EPERM;
	280
	281	return 0;
	282	}
	283
1ae43f82 OH	284	static int fat_allow_set_time(struct msdos_sb_info sbi, struct inode inode)
	285	{
	286	mode_t allow_utime = sbi->options.allow_utime;
	287
	288	if (current->fsuid != inode->i_uid) {
	289	if (in_group_p(inode->i_gid))
	290	allow_utime >>= 3;
	291	if (allow_utime & MAY_WRITE)
	292	return 1;
	293	}
	294
	295	/* use a default check */
	296	return 0;
	297	}
	298
1278fdd3 OH	299	int fat_setattr(struct dentry dentry, struct iattr attr)
1278fdd3 OH	300	{
8f593427	301	struct super_block *sb = dentry->d_sb;
1278fdd3 OH	302	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
	303	struct inode *inode = dentry->d_inode;
	304	int mask, error = 0;
1ae43f82	305	unsigned int ia_valid;
1278fdd3	306
8f593427	307	lock_super(sb);
1278fdd3 OH	308
	309	/*
	310	* Expand the file. Since inode_setattr() updates ->i_size
	311	* before calling the ->truncate(), but FAT needs to fill the
	312	* hole before it.
	313	*/
	314	if (attr->ia_valid & ATTR_SIZE) {
	315	if (attr->ia_size > inode->i_size) {
	316	error = fat_cont_expand(inode, attr->ia_size);
	317	if (error \|\| attr->ia_valid == ATTR_SIZE)
	318	goto out;
	319	attr->ia_valid &= ~ATTR_SIZE;
	320	}
	321	}
	322
1ae43f82 OH	323	/* Check for setting the inode time. */
	324	ia_valid = attr->ia_valid;
	325	if (ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET)) {
	326	if (fat_allow_set_time(sbi, inode))
	327	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET);
	328	}
	329
1278fdd3	330	error = inode_change_ok(inode, attr);
1ae43f82	331	attr->ia_valid = ia_valid;
1278fdd3 OH	332	if (error) {
	333	if (sbi->options.quiet)
	334	error = 0;
	335	goto out;
	336	}
	337	if (((attr->ia_valid & ATTR_UID) &&
	338	(attr->ia_uid != sbi->options.fs_uid)) \|\|
	339	((attr->ia_valid & ATTR_GID) &&
e97e8de3 OH	340	(attr->ia_gid != sbi->options.fs_gid)) \|\|
	341	((attr->ia_valid & ATTR_MODE) &&
	342	fat_check_mode(sbi, inode, attr->ia_mode) < 0))
1278fdd3 OH	343	error = -EPERM;
	344
	345	if (error) {
	346	if (sbi->options.quiet)
	347	error = 0;
	348	goto out;
	349	}
	350
1278fdd3 OH	351	error = inode_setattr(inode, attr);
	352	if (error)
	353	goto out;
	354
	355	if (S_ISDIR(inode->i_mode))
	356	mask = sbi->options.fs_dmask;
	357	else
	358	mask = sbi->options.fs_fmask;
	359	inode->i_mode &= S_IFMT \| (S_IRWXUGO & ~mask);
	360	out:
8f593427	361	unlock_super(sb);
1278fdd3 OH	362	return error;
	363	}
	364	EXPORT_SYMBOL_GPL(fat_setattr);
	365
754661f1	366	const struct inode_operations fat_file_inode_operations = {
1da177e4	367	.truncate = fat_truncate,
1278fdd3	368	.setattr = fat_setattr,
da63fc7c	369	.getattr = fat_getattr,
1da177e4	370	};