[deliverable/linux.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/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 msdos_sb_info *sbi = MSDOS_SB(inode->i_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;

	fat_free(inode, nr_clusters);
	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_sanitize_mode(const struct msdos_sb_info *sbi,
			     struct inode *inode, umode_t *mode_ptr)
{
	mode_t mask, perm;

	/*
	 * Note, the basic check is already done by a caller of
	 * (attr->ia_mode & ~MSDOS_VALID_MODE)
	 */

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

	perm = *mode_ptr & ~(S_IFMT | mask);

	/*
	 * 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.
	 */
	if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
		return -EPERM;
	if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
		return -EPERM;

	*mode_ptr &= S_IFMT | perm;

	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 msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
	struct inode *inode = dentry->d_inode;
	int error = 0;
	unsigned int ia_valid;

	/*
	 * 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) &&
	     (attr->ia_mode & ~MSDOS_VALID_MODE)))
		error = -EPERM;

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

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

	error = inode_setattr(inode, attr);
out:
	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>
1da177e4 LT	13	#include <linux/msdos_fs.h>
1da177e4	14	#include <linux/buffer_head.h>
05eb0b51	15	#include <linux/writeback.h>
3fcfab16	16	#include <linux/backing-dev.h>
ae78bf9c	17	#include <linux/blkdev.h>
1da177e4	18
1da177e4 LT	19	int fat_generic_ioctl(struct inode inode, struct file filp,
	20	unsigned int cmd, unsigned long arg)
	21	{
	22	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
	23	u32 __user user_attr = (u32 __user )arg;
	24
	25	switch (cmd) {
	26	case FAT_IOCTL_GET_ATTRIBUTES:
	27	{
	28	u32 attr;
	29
	30	if (inode->i_ino == MSDOS_ROOT_INO)
	31	attr = ATTR_DIR;
	32	else
	33	attr = fat_attr(inode);
	34
	35	return put_user(attr, user_attr);
	36	}
	37	case FAT_IOCTL_SET_ATTRIBUTES:
	38	{
	39	u32 attr, oldattr;
	40	int err, is_dir = S_ISDIR(inode->i_mode);
	41	struct iattr ia;
	42
	43	err = get_user(attr, user_attr);
	44	if (err)
	45	return err;
	46
1b1dcc1b	47	mutex_lock(&inode->i_mutex);
1da177e4	48
42a74f20 DH	49	err = mnt_want_write(filp->f_path.mnt);
	50	if (err)
	51	goto up_no_drop_write;
1da177e4 LT	52
	53	/*
	54	* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
	55	* prevents the user from turning us into a VFAT
	56	* longname entry. Also, we obviously can't set
	57	* any of the NTFS attributes in the high 24 bits.
	58	*/
	59	attr &= 0xff & ~(ATTR_VOLUME \| ATTR_DIR);
	60	/* Merge in ATTR_VOLUME and ATTR_DIR */
	61	attr \|= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) \|
	62	(is_dir ? ATTR_DIR : 0);
	63	oldattr = fat_attr(inode);
	64
	65	/* Equivalent to a chmod() */
	66	ia.ia_valid = ATTR_MODE \| ATTR_CTIME;
	67	if (is_dir) {
	68	ia.ia_mode = MSDOS_MKMODE(attr,
	69	S_IRWXUGO & ~sbi->options.fs_dmask)
	70	\| S_IFDIR;
	71	} else {
	72	ia.ia_mode = MSDOS_MKMODE(attr,
	73	(S_IRUGO \| S_IWUGO \| (inode->i_mode & S_IXUGO))
	74	& ~sbi->options.fs_fmask)
	75	\| S_IFREG;
	76	}
	77
	78	/* The root directory has no attributes */
	79	if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
	80	err = -EINVAL;
	81	goto up;
	82	}
	83
	84	if (sbi->options.sys_immutable) {
	85	if ((attr \| oldattr) & ATTR_SYS) {
	86	if (!capable(CAP_LINUX_IMMUTABLE)) {
	87	err = -EPERM;
	88	goto up;
	89	}
	90	}
	91	}
	92
	93	/* This MUST be done before doing anything irreversible... */
dba32306	94	err = notify_change(filp->f_path.dentry, &ia);
1da177e4 LT	95	if (err)
	96	goto up;
	97
	98	if (sbi->options.sys_immutable) {
	99	if (attr & ATTR_SYS)
	100	inode->i_flags \|= S_IMMUTABLE;
	101	else
	102	inode->i_flags &= S_IMMUTABLE;
	103	}
	104
	105	MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
	106	mark_inode_dirty(inode);
42a74f20 DH	107	up:
	108	mnt_drop_write(filp->f_path.mnt);
	109	up_no_drop_write:
1b1dcc1b	110	mutex_unlock(&inode->i_mutex);
1da177e4 LT	111	return err;
	112	}
	113	default:
	114	return -ENOTTY; /* Inappropriate ioctl for device */
	115	}
	116	}
	117
ae78bf9c CM	118	static int fat_file_release(struct inode inode, struct file filp)
	119	{
	120	if ((filp->f_mode & FMODE_WRITE) &&
	121	MSDOS_SB(inode->i_sb)->options.flush) {
	122	fat_flush_inodes(inode->i_sb, inode, NULL);
3fcfab16	123	congestion_wait(WRITE, HZ/10);
ae78bf9c CM	124	}
	125	return 0;
	126	}
	127
4b6f5d20	128	const struct file_operations fat_file_operations = {
1da177e4 LT	129	.llseek = generic_file_llseek,
	130	.read = do_sync_read,
	131	.write = do_sync_write,
1da177e4	132	.aio_read = generic_file_aio_read,
ef402268	133	.aio_write = generic_file_aio_write,
1da177e4	134	.mmap = generic_file_mmap,
ae78bf9c	135	.release = fat_file_release,
1da177e4 LT	136	.ioctl = fat_generic_ioctl,
1da177e4 LT	137	.fsync = file_fsync,
5ffc4ef4	138	.splice_read = generic_file_splice_read,
1da177e4 LT	139	};
1da177e4 LT	140
05eb0b51 OH	141	static int fat_cont_expand(struct inode *inode, loff_t size)
	142	{
	143	struct address_space *mapping = inode->i_mapping;
	144	loff_t start = inode->i_size, count = size - inode->i_size;
	145	int err;
	146
	147	err = generic_cont_expand_simple(inode, size);
	148	if (err)
	149	goto out;
	150
	151	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	152	mark_inode_dirty(inode);
	153	if (IS_SYNC(inode))
	154	err = sync_page_range_nolock(inode, mapping, start, count);
	155	out:
	156	return err;
	157	}
	158
1da177e4 LT	159	/* Free all clusters after the skip'th cluster. */
	160	static int fat_free(struct inode *inode, int skip)
	161	{
	162	struct super_block *sb = inode->i_sb;
	163	int err, wait, free_start, i_start, i_logstart;
	164
	165	if (MSDOS_I(inode)->i_start == 0)
	166	return 0;
	167
3b641407 OH	168	fat_cache_inval_inode(inode);
3b641407 OH	169
1da177e4	170	wait = IS_DIRSYNC(inode);
3b641407 OH	171	i_start = free_start = MSDOS_I(inode)->i_start;
	172	i_logstart = MSDOS_I(inode)->i_logstart;
	173
	174	/* First, we write the new file size. */
	175	if (!skip) {
	176	MSDOS_I(inode)->i_start = 0;
	177	MSDOS_I(inode)->i_logstart = 0;
	178	}
	179	MSDOS_I(inode)->i_attrs \|= ATTR_ARCH;
	180	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	181	if (wait) {
	182	err = fat_sync_inode(inode);
	183	if (err) {
	184	MSDOS_I(inode)->i_start = i_start;
	185	MSDOS_I(inode)->i_logstart = i_logstart;
	186	return err;
	187	}
	188	} else
	189	mark_inode_dirty(inode);
	190
	191	/* Write a new EOF, and get the remaining cluster chain for freeing. */
1da177e4 LT	192	if (skip) {
	193	struct fat_entry fatent;
	194	int ret, fclus, dclus;
	195
	196	ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
	197	if (ret < 0)
	198	return ret;
	199	else if (ret == FAT_ENT_EOF)
	200	return 0;
	201
	202	fatent_init(&fatent);
	203	ret = fat_ent_read(inode, &fatent, dclus);
	204	if (ret == FAT_ENT_EOF) {
	205	fatent_brelse(&fatent);
	206	return 0;
	207	} else if (ret == FAT_ENT_FREE) {
	208	fat_fs_panic(sb,
	209	"%s: invalid cluster chain (i_pos %lld)",
8e24eea7	210	__func__, MSDOS_I(inode)->i_pos);
1da177e4 LT	211	ret = -EIO;
	212	} else if (ret > 0) {
	213	err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
	214	if (err)
	215	ret = err;
	216	}
	217	fatent_brelse(&fatent);
	218	if (ret < 0)
	219	return ret;
	220
	221	free_start = ret;
1da177e4	222	}
1da177e4 LT	223	inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
	224
	225	/* Freeing the remained cluster chain */
	226	return fat_free_clusters(inode, free_start);
1da177e4 LT	227	}
	228
	229	void fat_truncate(struct inode *inode)
	230	{
9c20616c	231	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
1da177e4 LT	232	const unsigned int cluster_size = sbi->cluster_size;
	233	int nr_clusters;
	234
	235	/*
	236	* This protects against truncating a file bigger than it was then
	237	* trying to write into the hole.
	238	*/
	239	if (MSDOS_I(inode)->mmu_private > inode->i_size)
	240	MSDOS_I(inode)->mmu_private = inode->i_size;
	241
	242	nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits;
	243
1da177e4	244	fat_free(inode, nr_clusters);
ae78bf9c	245	fat_flush_inodes(inode->i_sb, inode, NULL);
1da177e4 LT	246	}
1da177e4 LT	247
da63fc7c OH	248	int fat_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	249	{
	250	struct inode *inode = dentry->d_inode;
	251	generic_fillattr(inode, stat);
	252	stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
	253	return 0;
	254	}
	255	EXPORT_SYMBOL_GPL(fat_getattr);
	256
2d518f84 OH	257	static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
2d518f84 OH	258	struct inode inode, umode_t mode_ptr)
1278fdd3	259	{
2d518f84	260	mode_t mask, perm;
1278fdd3	261
2d518f84 OH	262	/*
	263	* Note, the basic check is already done by a caller of
	264	* (attr->ia_mode & ~MSDOS_VALID_MODE)
	265	*/
	266
	267	if (S_ISREG(inode->i_mode))
1278fdd3 OH	268	mask = sbi->options.fs_fmask;
	269	else
	270	mask = sbi->options.fs_dmask;
	271
2d518f84 OH	272	perm = *mode_ptr & ~(S_IFMT \| mask);
2d518f84 OH	273
1278fdd3 OH	274	/*
	275	* Of the r and x bits, all (subject to umask) must be present. Of the
	276	* w bits, either all (subject to umask) or none must be present.
	277	*/
2d518f84	278	if ((perm & (S_IRUGO \| S_IXUGO)) != (inode->i_mode & (S_IRUGO\|S_IXUGO)))
1278fdd3	279	return -EPERM;
2d518f84	280	if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
1278fdd3 OH	281	return -EPERM;
1278fdd3 OH	282
2d518f84 OH	283	*mode_ptr &= S_IFMT \| perm;
2d518f84 OH	284
1278fdd3 OH	285	return 0;
	286	}
	287
1ae43f82 OH	288	static int fat_allow_set_time(struct msdos_sb_info sbi, struct inode inode)
	289	{
	290	mode_t allow_utime = sbi->options.allow_utime;
	291
	292	if (current->fsuid != inode->i_uid) {
	293	if (in_group_p(inode->i_gid))
	294	allow_utime >>= 3;
	295	if (allow_utime & MAY_WRITE)
	296	return 1;
	297	}
	298
	299	/* use a default check */
	300	return 0;
	301	}
	302
1278fdd3 OH	303	int fat_setattr(struct dentry dentry, struct iattr attr)
	304	{
	305	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
	306	struct inode *inode = dentry->d_inode;
2d518f84	307	int error = 0;
1ae43f82	308	unsigned int ia_valid;
1278fdd3	309
1278fdd3 OH	310	/*
	311	* Expand the file. Since inode_setattr() updates ->i_size
	312	* before calling the ->truncate(), but FAT needs to fill the
	313	* hole before it.
	314	*/
	315	if (attr->ia_valid & ATTR_SIZE) {
	316	if (attr->ia_size > inode->i_size) {
	317	error = fat_cont_expand(inode, attr->ia_size);
	318	if (error \|\| attr->ia_valid == ATTR_SIZE)
	319	goto out;
	320	attr->ia_valid &= ~ATTR_SIZE;
	321	}
	322	}
	323
1ae43f82 OH	324	/* Check for setting the inode time. */
	325	ia_valid = attr->ia_valid;
	326	if (ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET)) {
	327	if (fat_allow_set_time(sbi, inode))
	328	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET);
	329	}
	330
1278fdd3	331	error = inode_change_ok(inode, attr);
1ae43f82	332	attr->ia_valid = ia_valid;
1278fdd3 OH	333	if (error) {
	334	if (sbi->options.quiet)
	335	error = 0;
	336	goto out;
	337	}
2d518f84	338
1278fdd3 OH	339	if (((attr->ia_valid & ATTR_UID) &&
	340	(attr->ia_uid != sbi->options.fs_uid)) \|\|
	341	((attr->ia_valid & ATTR_GID) &&
e97e8de3 OH	342	(attr->ia_gid != sbi->options.fs_gid)) \|\|
e97e8de3 OH	343	((attr->ia_valid & ATTR_MODE) &&
2d518f84	344	(attr->ia_mode & ~MSDOS_VALID_MODE)))
1278fdd3 OH	345	error = -EPERM;
	346
	347	if (error) {
	348	if (sbi->options.quiet)
	349	error = 0;
	350	goto out;
	351	}
	352
2d518f84 OH	353	/*
	354	* We don't return -EPERM here. Yes, strange, but this is too
	355	* old behavior.
	356	*/
	357	if (attr->ia_valid & ATTR_MODE) {
	358	if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	359	attr->ia_valid &= ~ATTR_MODE;
	360	}
1278fdd3	361
2d518f84	362	error = inode_setattr(inode, attr);
1278fdd3	363	out:
1278fdd3 OH	364	return error;
	365	}
	366	EXPORT_SYMBOL_GPL(fat_setattr);
	367
754661f1	368	const struct inode_operations fat_file_inode_operations = {
1da177e4	369	.truncate = fat_truncate,
1278fdd3	370	.setattr = fat_setattr,
da63fc7c	371	.getattr = fat_getattr,
1da177e4	372	};