[mirror_ubuntu-eoan-kernel.git] / fs / sync.c

/*
 * High-level sync()-related operations
 */

#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/syscalls.h>
#include <linux/linkage.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include <linux/buffer_head.h>

#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
			SYNC_FILE_RANGE_WAIT_AFTER)

/*
 * sync everything.  Start out by waking pdflush, because that writes back
 * all queues in parallel.
 */
static void do_sync(unsigned long wait)
{
	wakeup_pdflush(0);
	sync_inodes(0);		/* All mappings, inodes and their blockdevs */
	vfs_dq_sync(NULL);
	sync_supers();		/* Write the superblocks */
	sync_filesystems(0);	/* Start syncing the filesystems */
	sync_filesystems(wait);	/* Waitingly sync the filesystems */
	sync_inodes(wait);	/* Mappings, inodes and blockdevs, again. */
	if (!wait)
		printk("Emergency Sync complete\n");
	if (unlikely(laptop_mode))
		laptop_sync_completion();
}

SYSCALL_DEFINE0(sync)
{
	do_sync(1);
	return 0;
}

static void do_sync_work(struct work_struct *work)
{
	do_sync(0);
	kfree(work);
}

void emergency_sync(void)
{
	struct work_struct *work;

	work = kmalloc(sizeof(*work), GFP_ATOMIC);
	if (work) {
		INIT_WORK(work, do_sync_work);
		schedule_work(work);
	}
}

/*
 * Generic function to fsync a file.
 *
 * filp may be NULL if called via the msync of a vma.
 */
int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
{
	struct inode * inode = dentry->d_inode;
	struct super_block * sb;
	int ret, err;

	/* sync the inode to buffers */
	ret = write_inode_now(inode, 0);

	/* sync the superblock to buffers */
	sb = inode->i_sb;
	lock_super(sb);
	if (sb->s_dirt && sb->s_op->write_super)
		sb->s_op->write_super(sb);
	unlock_super(sb);

	/* .. finally sync the buffers to disk */
	err = sync_blockdev(sb->s_bdev);
	if (!ret)
		ret = err;
	return ret;
}

/**
 * vfs_fsync - perform a fsync or fdatasync on a file
 * @file:		file to sync
 * @dentry:		dentry of @file
 * @data:		only perform a fdatasync operation
 *
 * Write back data and metadata for @file to disk.  If @datasync is
 * set only metadata needed to access modified file data is written.
 *
 * In case this function is called from nfsd @file may be %NULL and
 * only @dentry is set.  This can only happen when the filesystem
 * implements the export_operations API.
 */
int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	const struct file_operations *fop;
	struct address_space *mapping;
	int err, ret;

	/*
	 * Get mapping and operations from the file in case we have
	 * as file, or get the default values for them in case we
	 * don't have a struct file available.  Damn nfsd..
	 */
	if (file) {
		mapping = file->f_mapping;
		fop = file->f_op;
	} else {
		mapping = dentry->d_inode->i_mapping;
		fop = dentry->d_inode->i_fop;
	}

	if (!fop || !fop->fsync) {
		ret = -EINVAL;
		goto out;
	}

	ret = filemap_fdatawrite(mapping);

	/*
	 * We need to protect against concurrent writers, which could cause
	 * livelocks in fsync_buffers_list().
	 */
	mutex_lock(&mapping->host->i_mutex);
	err = fop->fsync(file, dentry, datasync);
	if (!ret)
		ret = err;
	mutex_unlock(&mapping->host->i_mutex);
	err = filemap_fdatawait(mapping);
	if (!ret)
		ret = err;
out:
	return ret;
}
EXPORT_SYMBOL(vfs_fsync);

static int do_fsync(unsigned int fd, int datasync)
{
	struct file *file;
	int ret = -EBADF;

	file = fget(fd);
	if (file) {
		ret = vfs_fsync(file, file->f_path.dentry, datasync);
		fput(file);
	}
	return ret;
}

SYSCALL_DEFINE1(fsync, unsigned int, fd)
{
	return do_fsync(fd, 0);
}

SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
{
	return do_fsync(fd, 1);
}

/*
 * sys_sync_file_range() permits finely controlled syncing over a segment of
 * a file in the range offset .. (offset+nbytes-1) inclusive.  If nbytes is
 * zero then sys_sync_file_range() will operate from offset out to EOF.
 *
 * The flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
 * before performing the write.
 *
 * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
 * range which are not presently under writeback. Note that this may block for
 * significant periods due to exhaustion of disk request structures.
 *
 * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
 * after performing the write.
 *
 * Useful combinations of the flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
 * in the range which were dirty on entry to sys_sync_file_range() are placed
 * under writeout.  This is a start-write-for-data-integrity operation.
 *
 * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
 * are not presently under writeout.  This is an asynchronous flush-to-disk
 * operation.  Not suitable for data integrity operations.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
 * completion of writeout of all pages in the range.  This will be used after an
 * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
 * for that operation to complete and to return the result.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER:
 * a traditional sync() operation.  This is a write-for-data-integrity operation
 * which will ensure that all pages in the range which were dirty on entry to
 * sys_sync_file_range() are committed to disk.
 *
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
 * I/O errors or ENOSPC conditions and will return those to the caller, after
 * clearing the EIO and ENOSPC flags in the address_space.
 *
 * It should be noted that none of these operations write out the file's
 * metadata.  So unless the application is strictly performing overwrites of
 * already-instantiated disk blocks, there are no guarantees here that the data
 * will be available after a crash.
 */
SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
				unsigned int flags)
{
	int ret;
	struct file *file;
	loff_t endbyte;			/* inclusive */
	int fput_needed;
	umode_t i_mode;

	ret = -EINVAL;
	if (flags & ~VALID_FLAGS)
		goto out;

	endbyte = offset + nbytes;

	if ((s64)offset < 0)
		goto out;
	if ((s64)endbyte < 0)
		goto out;
	if (endbyte < offset)
		goto out;

	if (sizeof(pgoff_t) == 4) {
		if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * The range starts outside a 32 bit machine's
			 * pagecache addressing capabilities.  Let it "succeed"
			 */
			ret = 0;
			goto out;
		}
		if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * Out to EOF
			 */
			nbytes = 0;
		}
	}

	if (nbytes == 0)
		endbyte = LLONG_MAX;
	else
		endbyte--;		/* inclusive */

	ret = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto out;

	i_mode = file->f_path.dentry->d_inode->i_mode;
	ret = -ESPIPE;
	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
			!S_ISLNK(i_mode))
		goto out_put;

	ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
out_put:
	fput_light(file, fput_needed);
out:
	return ret;
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_sync_file_range(long fd, loff_t offset, loff_t nbytes,
				    long flags)
{
	return SYSC_sync_file_range((int) fd, offset, nbytes,
				    (unsigned int) flags);
}
SYSCALL_ALIAS(sys_sync_file_range, SyS_sync_file_range);
#endif

/* It would be nice if people remember that not all the world's an i386
   when they introduce new system calls */
SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags,
				 loff_t offset, loff_t nbytes)
{
	return sys_sync_file_range(fd, offset, nbytes, flags);
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_sync_file_range2(long fd, long flags,
				     loff_t offset, loff_t nbytes)
{
	return SYSC_sync_file_range2((int) fd, (unsigned int) flags,
				     offset, nbytes);
}
SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
#endif

/*
 * `endbyte' is inclusive
 */
int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
			  loff_t endbyte, unsigned int flags)
{
	int ret;

	if (!mapping) {
		ret = -EINVAL;
		goto out;
	}

	ret = 0;
	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
		ret = wait_on_page_writeback_range(mapping,
					offset >> PAGE_CACHE_SHIFT,
					endbyte >> PAGE_CACHE_SHIFT);
		if (ret < 0)
			goto out;
	}

	if (flags & SYNC_FILE_RANGE_WRITE) {
		ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
						WB_SYNC_ALL);
		if (ret < 0)
			goto out;
	}

	if (flags & SYNC_FILE_RANGE_WAIT_AFTER) {
		ret = wait_on_page_writeback_range(mapping,
					offset >> PAGE_CACHE_SHIFT,
					endbyte >> PAGE_CACHE_SHIFT);
	}
out:
	return ret;
}
EXPORT_SYMBOL_GPL(do_sync_mapping_range);
Commit	Line	Data
f79e2abb AM	1	/*
	2	* High-level sync()-related operations
	3	*/
	4
	5	#include <linux/kernel.h>
	6	#include <linux/file.h>
	7	#include <linux/fs.h>
	8	#include <linux/module.h>
914e2637	9	#include <linux/sched.h>
f79e2abb AM	10	#include <linux/writeback.h>
	11	#include <linux/syscalls.h>
	12	#include <linux/linkage.h>
	13	#include <linux/pagemap.h>
cf9a2ae8 DH	14	#include <linux/quotaops.h>
cf9a2ae8 DH	15	#include <linux/buffer_head.h>
f79e2abb AM	16
	17	#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE\| \
	18	SYNC_FILE_RANGE_WAIT_AFTER)
	19
cf9a2ae8 DH	20	/*
	21	* sync everything. Start out by waking pdflush, because that writes back
	22	* all queues in parallel.
	23	*/
	24	static void do_sync(unsigned long wait)
	25	{
	26	wakeup_pdflush(0);
	27	sync_inodes(0); /* All mappings, inodes and their blockdevs */
9e3509e2	28	vfs_dq_sync(NULL);
cf9a2ae8 DH	29	sync_supers(); /* Write the superblocks */
	30	sync_filesystems(0); /* Start syncing the filesystems */
	31	sync_filesystems(wait); /* Waitingly sync the filesystems */
	32	sync_inodes(wait); /* Mappings, inodes and blockdevs, again. */
	33	if (!wait)
	34	printk("Emergency Sync complete\n");
	35	if (unlikely(laptop_mode))
	36	laptop_sync_completion();
	37	}
	38
a5f8fa9e	39	SYSCALL_DEFINE0(sync)
cf9a2ae8 DH	40	{
	41	do_sync(1);
	42	return 0;
	43	}
	44
a2a9537a JA	45	static void do_sync_work(struct work_struct *work)
	46	{
	47	do_sync(0);
	48	kfree(work);
	49	}
	50
cf9a2ae8 DH	51	void emergency_sync(void)
cf9a2ae8 DH	52	{
a2a9537a JA	53	struct work_struct *work;
	54
	55	work = kmalloc(sizeof(*work), GFP_ATOMIC);
	56	if (work) {
	57	INIT_WORK(work, do_sync_work);
	58	schedule_work(work);
	59	}
cf9a2ae8 DH	60	}
	61
	62	/*
	63	* Generic function to fsync a file.
	64	*
	65	* filp may be NULL if called via the msync of a vma.
	66	*/
	67	int file_fsync(struct file filp, struct dentry dentry, int datasync)
	68	{
	69	struct inode * inode = dentry->d_inode;
	70	struct super_block * sb;
	71	int ret, err;
	72
	73	/* sync the inode to buffers */
	74	ret = write_inode_now(inode, 0);
	75
	76	/* sync the superblock to buffers */
	77	sb = inode->i_sb;
	78	lock_super(sb);
762873c2	79	if (sb->s_dirt && sb->s_op->write_super)
cf9a2ae8 DH	80	sb->s_op->write_super(sb);
	81	unlock_super(sb);
	82
	83	/* .. finally sync the buffers to disk */
	84	err = sync_blockdev(sb->s_bdev);
	85	if (!ret)
	86	ret = err;
	87	return ret;
	88	}
	89
4c728ef5 CH	90	/**
	91	* vfs_fsync - perform a fsync or fdatasync on a file
	92	* @file: file to sync
	93	* @dentry: dentry of @file
	94	* @data: only perform a fdatasync operation
	95	*
	96	* Write back data and metadata for @file to disk. If @datasync is
	97	* set only metadata needed to access modified file data is written.
	98	*
	99	* In case this function is called from nfsd @file may be %NULL and
	100	* only @dentry is set. This can only happen when the filesystem
	101	* implements the export_operations API.
	102	*/
	103	int vfs_fsync(struct file file, struct dentry dentry, int datasync)
cf9a2ae8	104	{
4c728ef5 CH	105	const struct file_operations *fop;
	106	struct address_space *mapping;
	107	int err, ret;
	108
	109	/*
	110	* Get mapping and operations from the file in case we have
	111	* as file, or get the default values for them in case we
	112	* don't have a struct file available. Damn nfsd..
	113	*/
	114	if (file) {
	115	mapping = file->f_mapping;
	116	fop = file->f_op;
	117	} else {
	118	mapping = dentry->d_inode->i_mapping;
	119	fop = dentry->d_inode->i_fop;
	120	}
cf9a2ae8	121
4c728ef5	122	if (!fop \|\| !fop->fsync) {
cf9a2ae8 DH	123	ret = -EINVAL;
	124	goto out;
	125	}
	126
	127	ret = filemap_fdatawrite(mapping);
	128
	129	/*
	130	* We need to protect against concurrent writers, which could cause
	131	* livelocks in fsync_buffers_list().
	132	*/
	133	mutex_lock(&mapping->host->i_mutex);
4c728ef5	134	err = fop->fsync(file, dentry, datasync);
cf9a2ae8 DH	135	if (!ret)
	136	ret = err;
	137	mutex_unlock(&mapping->host->i_mutex);
	138	err = filemap_fdatawait(mapping);
	139	if (!ret)
	140	ret = err;
	141	out:
	142	return ret;
	143	}
4c728ef5	144	EXPORT_SYMBOL(vfs_fsync);
cf9a2ae8	145
4c728ef5	146	static int do_fsync(unsigned int fd, int datasync)
cf9a2ae8 DH	147	{
	148	struct file *file;
	149	int ret = -EBADF;
	150
	151	file = fget(fd);
	152	if (file) {
4c728ef5	153	ret = vfs_fsync(file, file->f_path.dentry, datasync);
cf9a2ae8 DH	154	fput(file);
	155	}
	156	return ret;
	157	}
	158
a5f8fa9e	159	SYSCALL_DEFINE1(fsync, unsigned int, fd)
cf9a2ae8	160	{
4c728ef5	161	return do_fsync(fd, 0);
cf9a2ae8 DH	162	}
cf9a2ae8 DH	163
a5f8fa9e	164	SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
cf9a2ae8	165	{
4c728ef5	166	return do_fsync(fd, 1);
cf9a2ae8 DH	167	}
cf9a2ae8 DH	168
f79e2abb AM	169	/*
	170	* sys_sync_file_range() permits finely controlled syncing over a segment of
	171	* a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
	172	* zero then sys_sync_file_range() will operate from offset out to EOF.
	173	*
	174	* The flag bits are:
	175	*
	176	* SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
	177	* before performing the write.
	178	*
	179	* SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
cce77081 PM	180	* range which are not presently under writeback. Note that this may block for
cce77081 PM	181	* significant periods due to exhaustion of disk request structures.
f79e2abb AM	182	*
	183	* SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
	184	* after performing the write.
	185	*
	186	* Useful combinations of the flag bits are:
	187	*
	188	* SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE: ensures that all pages
	189	* in the range which were dirty on entry to sys_sync_file_range() are placed
	190	* under writeout. This is a start-write-for-data-integrity operation.
	191	*
	192	* SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
	193	* are not presently under writeout. This is an asynchronous flush-to-disk
	194	* operation. Not suitable for data integrity operations.
	195	*
	196	* SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
	197	* completion of writeout of all pages in the range. This will be used after an
	198	* earlier SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE operation to wait
	199	* for that operation to complete and to return the result.
	200	*
	201	* SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE\|SYNC_FILE_RANGE_WAIT_AFTER:
	202	* a traditional sync() operation. This is a write-for-data-integrity operation
	203	* which will ensure that all pages in the range which were dirty on entry to
	204	* sys_sync_file_range() are committed to disk.
	205	*
	206	*
	207	* SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
	208	* I/O errors or ENOSPC conditions and will return those to the caller, after
	209	* clearing the EIO and ENOSPC flags in the address_space.
	210	*
	211	* It should be noted that none of these operations write out the file's
	212	* metadata. So unless the application is strictly performing overwrites of
	213	* already-instantiated disk blocks, there are no guarantees here that the data
	214	* will be available after a crash.
	215	*/
6673e0c3 HC	216	SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
6673e0c3 HC	217	unsigned int flags)
f79e2abb AM	218	{
	219	int ret;
	220	struct file *file;
	221	loff_t endbyte; /* inclusive */
	222	int fput_needed;
	223	umode_t i_mode;
	224
	225	ret = -EINVAL;
	226	if (flags & ~VALID_FLAGS)
	227	goto out;
	228
	229	endbyte = offset + nbytes;
	230
	231	if ((s64)offset < 0)
	232	goto out;
	233	if ((s64)endbyte < 0)
	234	goto out;
	235	if (endbyte < offset)
	236	goto out;
	237
	238	if (sizeof(pgoff_t) == 4) {
	239	if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
	240	/*
	241	* The range starts outside a 32 bit machine's
	242	* pagecache addressing capabilities. Let it "succeed"
	243	*/
	244	ret = 0;
	245	goto out;
	246	}
	247	if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
	248	/*
	249	* Out to EOF
	250	*/
	251	nbytes = 0;
	252	}
	253	}
	254
	255	if (nbytes == 0)
111ebb6e	256	endbyte = LLONG_MAX;
f79e2abb AM	257	else
	258	endbyte--; /* inclusive */
	259
	260	ret = -EBADF;
	261	file = fget_light(fd, &fput_needed);
	262	if (!file)
	263	goto out;
	264
0f7fc9e4	265	i_mode = file->f_path.dentry->d_inode->i_mode;
f79e2abb AM	266	ret = -ESPIPE;
	267	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
	268	!S_ISLNK(i_mode))
	269	goto out_put;
	270
ef51c976	271	ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
f79e2abb AM	272	out_put:
	273	fput_light(file, fput_needed);
	274	out:
	275	return ret;
	276	}
6673e0c3 HC	277	#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
	278	asmlinkage long SyS_sync_file_range(long fd, loff_t offset, loff_t nbytes,
	279	long flags)
	280	{
	281	return SYSC_sync_file_range((int) fd, offset, nbytes,
	282	(unsigned int) flags);
	283	}
	284	SYSCALL_ALIAS(sys_sync_file_range, SyS_sync_file_range);
	285	#endif
f79e2abb	286
edd5cd4a DW	287	/* It would be nice if people remember that not all the world's an i386
edd5cd4a DW	288	when they introduce new system calls */
6673e0c3 HC	289	SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags,
6673e0c3 HC	290	loff_t offset, loff_t nbytes)
edd5cd4a DW	291	{
	292	return sys_sync_file_range(fd, offset, nbytes, flags);
	293	}
6673e0c3 HC	294	#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
	295	asmlinkage long SyS_sync_file_range2(long fd, long flags,
	296	loff_t offset, loff_t nbytes)
	297	{
	298	return SYSC_sync_file_range2((int) fd, (unsigned int) flags,
	299	offset, nbytes);
	300	}
	301	SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
	302	#endif
edd5cd4a	303
f79e2abb AM	304	/*
	305	* `endbyte' is inclusive
	306	*/
5b04aa3a MF	307	int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
5b04aa3a MF	308	loff_t endbyte, unsigned int flags)
f79e2abb AM	309	{
f79e2abb AM	310	int ret;
f79e2abb	311
f79e2abb AM	312	if (!mapping) {
	313	ret = -EINVAL;
	314	goto out;
	315	}
	316
	317	ret = 0;
	318	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
	319	ret = wait_on_page_writeback_range(mapping,
	320	offset >> PAGE_CACHE_SHIFT,
	321	endbyte >> PAGE_CACHE_SHIFT);
	322	if (ret < 0)
	323	goto out;
	324	}
	325
	326	if (flags & SYNC_FILE_RANGE_WRITE) {
	327	ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
ee53a891	328	WB_SYNC_ALL);
f79e2abb AM	329	if (ret < 0)
	330	goto out;
	331	}
	332
	333	if (flags & SYNC_FILE_RANGE_WAIT_AFTER) {
	334	ret = wait_on_page_writeback_range(mapping,
	335	offset >> PAGE_CACHE_SHIFT,
	336	endbyte >> PAGE_CACHE_SHIFT);
	337	}
	338	out:
	339	return ret;
	340	}
5b04aa3a	341	EXPORT_SYMBOL_GPL(do_sync_mapping_range);