[net-next-2.6.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>
#include "internal.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_inodes(wait);	/* Mappings, inodes and blockdevs, again. */
	sync_supers();		/* Write the superblocks */
	sync_filesystems(0);	/* Start syncing the filesystems */
	sync_filesystems(wait);	/* Waitingly sync the filesystems */
	sync_blockdevs();
	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>
5a3e5cb8	16	#include "internal.h"
f79e2abb AM	17
	18	#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE\| \
	19	SYNC_FILE_RANGE_WAIT_AFTER)
	20
cf9a2ae8 DH	21	/*
	22	* sync everything. Start out by waking pdflush, because that writes back
	23	* all queues in parallel.
	24	*/
	25	static void do_sync(unsigned long wait)
	26	{
	27	wakeup_pdflush(0);
	28	sync_inodes(0); /* All mappings, inodes and their blockdevs */
9e3509e2	29	vfs_dq_sync(NULL);
5a3e5cb8	30	sync_inodes(wait); /* Mappings, inodes and blockdevs, again. */
cf9a2ae8 DH	31	sync_supers(); /* Write the superblocks */
	32	sync_filesystems(0); /* Start syncing the filesystems */
	33	sync_filesystems(wait); /* Waitingly sync the filesystems */
5a3e5cb8	34	sync_blockdevs();
cf9a2ae8 DH	35	if (!wait)
	36	printk("Emergency Sync complete\n");
	37	if (unlikely(laptop_mode))
	38	laptop_sync_completion();
	39	}
	40
a5f8fa9e	41	SYSCALL_DEFINE0(sync)
cf9a2ae8 DH	42	{
	43	do_sync(1);
	44	return 0;
	45	}
	46
a2a9537a JA	47	static void do_sync_work(struct work_struct *work)
	48	{
	49	do_sync(0);
	50	kfree(work);
	51	}
	52
cf9a2ae8 DH	53	void emergency_sync(void)
cf9a2ae8 DH	54	{
a2a9537a JA	55	struct work_struct *work;
	56
	57	work = kmalloc(sizeof(*work), GFP_ATOMIC);
	58	if (work) {
	59	INIT_WORK(work, do_sync_work);
	60	schedule_work(work);
	61	}
cf9a2ae8 DH	62	}
	63
	64	/*
	65	* Generic function to fsync a file.
	66	*
	67	* filp may be NULL if called via the msync of a vma.
	68	*/
	69	int file_fsync(struct file filp, struct dentry dentry, int datasync)
	70	{
	71	struct inode * inode = dentry->d_inode;
	72	struct super_block * sb;
	73	int ret, err;
	74
	75	/* sync the inode to buffers */
	76	ret = write_inode_now(inode, 0);
	77
	78	/* sync the superblock to buffers */
	79	sb = inode->i_sb;
	80	lock_super(sb);
762873c2	81	if (sb->s_dirt && sb->s_op->write_super)
cf9a2ae8 DH	82	sb->s_op->write_super(sb);
	83	unlock_super(sb);
	84
	85	/* .. finally sync the buffers to disk */
	86	err = sync_blockdev(sb->s_bdev);
	87	if (!ret)
	88	ret = err;
	89	return ret;
	90	}
	91
4c728ef5 CH	92	/**
	93	* vfs_fsync - perform a fsync or fdatasync on a file
	94	* @file: file to sync
	95	* @dentry: dentry of @file
	96	* @data: only perform a fdatasync operation
	97	*
	98	* Write back data and metadata for @file to disk. If @datasync is
	99	* set only metadata needed to access modified file data is written.
	100	*
	101	* In case this function is called from nfsd @file may be %NULL and
	102	* only @dentry is set. This can only happen when the filesystem
	103	* implements the export_operations API.
	104	*/
	105	int vfs_fsync(struct file file, struct dentry dentry, int datasync)
cf9a2ae8	106	{
4c728ef5 CH	107	const struct file_operations *fop;
	108	struct address_space *mapping;
	109	int err, ret;
	110
	111	/*
	112	* Get mapping and operations from the file in case we have
	113	* as file, or get the default values for them in case we
	114	* don't have a struct file available. Damn nfsd..
	115	*/
	116	if (file) {
	117	mapping = file->f_mapping;
	118	fop = file->f_op;
	119	} else {
	120	mapping = dentry->d_inode->i_mapping;
	121	fop = dentry->d_inode->i_fop;
	122	}
cf9a2ae8	123
4c728ef5	124	if (!fop \|\| !fop->fsync) {
cf9a2ae8 DH	125	ret = -EINVAL;
	126	goto out;
	127	}
	128
	129	ret = filemap_fdatawrite(mapping);
	130
	131	/*
	132	* We need to protect against concurrent writers, which could cause
	133	* livelocks in fsync_buffers_list().
	134	*/
	135	mutex_lock(&mapping->host->i_mutex);
4c728ef5	136	err = fop->fsync(file, dentry, datasync);
cf9a2ae8 DH	137	if (!ret)
	138	ret = err;
	139	mutex_unlock(&mapping->host->i_mutex);
	140	err = filemap_fdatawait(mapping);
	141	if (!ret)
	142	ret = err;
	143	out:
	144	return ret;
	145	}
4c728ef5	146	EXPORT_SYMBOL(vfs_fsync);
cf9a2ae8	147
4c728ef5	148	static int do_fsync(unsigned int fd, int datasync)
cf9a2ae8 DH	149	{
	150	struct file *file;
	151	int ret = -EBADF;
	152
	153	file = fget(fd);
	154	if (file) {
4c728ef5	155	ret = vfs_fsync(file, file->f_path.dentry, datasync);
cf9a2ae8 DH	156	fput(file);
	157	}
	158	return ret;
	159	}
	160
a5f8fa9e	161	SYSCALL_DEFINE1(fsync, unsigned int, fd)
cf9a2ae8	162	{
4c728ef5	163	return do_fsync(fd, 0);
cf9a2ae8 DH	164	}
cf9a2ae8 DH	165
a5f8fa9e	166	SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
cf9a2ae8	167	{
4c728ef5	168	return do_fsync(fd, 1);
cf9a2ae8 DH	169	}
cf9a2ae8 DH	170
f79e2abb AM	171	/*
	172	* sys_sync_file_range() permits finely controlled syncing over a segment of
	173	* a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
	174	* zero then sys_sync_file_range() will operate from offset out to EOF.
	175	*
	176	* The flag bits are:
	177	*
	178	* SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
	179	* before performing the write.
	180	*
	181	* SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
cce77081 PM	182	* range which are not presently under writeback. Note that this may block for
cce77081 PM	183	* significant periods due to exhaustion of disk request structures.
f79e2abb AM	184	*
	185	* SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
	186	* after performing the write.
	187	*
	188	* Useful combinations of the flag bits are:
	189	*
	190	* SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE: ensures that all pages
	191	* in the range which were dirty on entry to sys_sync_file_range() are placed
	192	* under writeout. This is a start-write-for-data-integrity operation.
	193	*
	194	* SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
	195	* are not presently under writeout. This is an asynchronous flush-to-disk
	196	* operation. Not suitable for data integrity operations.
	197	*
	198	* SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
	199	* completion of writeout of all pages in the range. This will be used after an
	200	* earlier SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE operation to wait
	201	* for that operation to complete and to return the result.
	202	*
	203	* SYNC_FILE_RANGE_WAIT_BEFORE\|SYNC_FILE_RANGE_WRITE\|SYNC_FILE_RANGE_WAIT_AFTER:
	204	* a traditional sync() operation. This is a write-for-data-integrity operation
	205	* which will ensure that all pages in the range which were dirty on entry to
	206	* sys_sync_file_range() are committed to disk.
	207	*
	208	*
	209	* SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
	210	* I/O errors or ENOSPC conditions and will return those to the caller, after
	211	* clearing the EIO and ENOSPC flags in the address_space.
	212	*
	213	* It should be noted that none of these operations write out the file's
	214	* metadata. So unless the application is strictly performing overwrites of
	215	* already-instantiated disk blocks, there are no guarantees here that the data
	216	* will be available after a crash.
	217	*/
6673e0c3 HC	218	SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
6673e0c3 HC	219	unsigned int flags)
f79e2abb AM	220	{
	221	int ret;
	222	struct file *file;
	223	loff_t endbyte; /* inclusive */
	224	int fput_needed;
	225	umode_t i_mode;
	226
	227	ret = -EINVAL;
	228	if (flags & ~VALID_FLAGS)
	229	goto out;
	230
	231	endbyte = offset + nbytes;
	232
	233	if ((s64)offset < 0)
	234	goto out;
	235	if ((s64)endbyte < 0)
	236	goto out;
	237	if (endbyte < offset)
	238	goto out;
	239
	240	if (sizeof(pgoff_t) == 4) {
	241	if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
	242	/*
	243	* The range starts outside a 32 bit machine's
	244	* pagecache addressing capabilities. Let it "succeed"
	245	*/
	246	ret = 0;
	247	goto out;
	248	}
	249	if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
	250	/*
	251	* Out to EOF
	252	*/
	253	nbytes = 0;
	254	}
	255	}
	256
	257	if (nbytes == 0)
111ebb6e	258	endbyte = LLONG_MAX;
f79e2abb AM	259	else
	260	endbyte--; /* inclusive */
	261
	262	ret = -EBADF;
	263	file = fget_light(fd, &fput_needed);
	264	if (!file)
	265	goto out;
	266
0f7fc9e4	267	i_mode = file->f_path.dentry->d_inode->i_mode;
f79e2abb AM	268	ret = -ESPIPE;
	269	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
	270	!S_ISLNK(i_mode))
	271	goto out_put;
	272
ef51c976	273	ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
f79e2abb AM	274	out_put:
	275	fput_light(file, fput_needed);
	276	out:
	277	return ret;
	278	}
6673e0c3 HC	279	#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
	280	asmlinkage long SyS_sync_file_range(long fd, loff_t offset, loff_t nbytes,
	281	long flags)
	282	{
	283	return SYSC_sync_file_range((int) fd, offset, nbytes,
	284	(unsigned int) flags);
	285	}
	286	SYSCALL_ALIAS(sys_sync_file_range, SyS_sync_file_range);
	287	#endif
f79e2abb	288
edd5cd4a DW	289	/* It would be nice if people remember that not all the world's an i386
edd5cd4a DW	290	when they introduce new system calls */
6673e0c3 HC	291	SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags,
6673e0c3 HC	292	loff_t offset, loff_t nbytes)
edd5cd4a DW	293	{
	294	return sys_sync_file_range(fd, offset, nbytes, flags);
	295	}
6673e0c3 HC	296	#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
	297	asmlinkage long SyS_sync_file_range2(long fd, long flags,
	298	loff_t offset, loff_t nbytes)
	299	{
	300	return SYSC_sync_file_range2((int) fd, (unsigned int) flags,
	301	offset, nbytes);
	302	}
	303	SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
	304	#endif
edd5cd4a	305
f79e2abb AM	306	/*
	307	* `endbyte' is inclusive
	308	*/
5b04aa3a MF	309	int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
5b04aa3a MF	310	loff_t endbyte, unsigned int flags)
f79e2abb AM	311	{
f79e2abb AM	312	int ret;
f79e2abb	313
f79e2abb AM	314	if (!mapping) {
	315	ret = -EINVAL;
	316	goto out;
	317	}
	318
	319	ret = 0;
	320	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
	321	ret = wait_on_page_writeback_range(mapping,
	322	offset >> PAGE_CACHE_SHIFT,
	323	endbyte >> PAGE_CACHE_SHIFT);
	324	if (ret < 0)
	325	goto out;
	326	}
	327
	328	if (flags & SYNC_FILE_RANGE_WRITE) {
	329	ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
ee53a891	330	WB_SYNC_ALL);
f79e2abb AM	331	if (ret < 0)
	332	goto out;
	333	}
	334
	335	if (flags & SYNC_FILE_RANGE_WAIT_AFTER) {
	336	ret = wait_on_page_writeback_range(mapping,
	337	offset >> PAGE_CACHE_SHIFT,
	338	endbyte >> PAGE_CACHE_SHIFT);
	339	}
	340	out:
	341	return ret;
	342	}
5b04aa3a	343	EXPORT_SYMBOL_GPL(do_sync_mapping_range);