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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * High-level sync()-related operations
4 */
5
6#include <linux/kernel.h>
7#include <linux/file.h>
8#include <linux/fs.h>
9#include <linux/slab.h>
10#include <linux/export.h>
11#include <linux/namei.h>
12#include <linux/sched.h>
13#include <linux/writeback.h>
14#include <linux/syscalls.h>
15#include <linux/linkage.h>
16#include <linux/pagemap.h>
17#include <linux/quotaops.h>
18#include <linux/backing-dev.h>
19#include "internal.h"
20
21#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
22 SYNC_FILE_RANGE_WAIT_AFTER)
23
24/*
25 * Do the filesystem syncing work. For simple filesystems
26 * writeback_inodes_sb(sb) just dirties buffers with inodes so we have to
27 * submit IO for these buffers via __sync_blockdev(). This also speeds up the
28 * wait == 1 case since in that case write_inode() functions do
29 * sync_dirty_buffer() and thus effectively write one block at a time.
30 */
31static int __sync_filesystem(struct super_block *sb, int wait)
32{
33 if (wait)
34 sync_inodes_sb(sb);
35 else
36 writeback_inodes_sb(sb, WB_REASON_SYNC);
37
38 if (sb->s_op->sync_fs)
39 sb->s_op->sync_fs(sb, wait);
40 return __sync_blockdev(sb->s_bdev, wait);
41}
42
43/*
44 * Write out and wait upon all dirty data associated with this
45 * superblock. Filesystem data as well as the underlying block
46 * device. Takes the superblock lock.
47 */
48int sync_filesystem(struct super_block *sb)
49{
50 int ret;
51
52 /*
53 * We need to be protected against the filesystem going from
54 * r/o to r/w or vice versa.
55 */
56 WARN_ON(!rwsem_is_locked(&sb->s_umount));
57
58 /*
59 * No point in syncing out anything if the filesystem is read-only.
60 */
61 if (sb_rdonly(sb))
62 return 0;
63
64 ret = __sync_filesystem(sb, 0);
65 if (ret < 0)
66 return ret;
67 return __sync_filesystem(sb, 1);
68}
69EXPORT_SYMBOL(sync_filesystem);
70
71static void sync_inodes_one_sb(struct super_block *sb, void *arg)
72{
73 if (!sb_rdonly(sb))
74 sync_inodes_sb(sb);
75}
76
77static void sync_fs_one_sb(struct super_block *sb, void *arg)
78{
79 if (!sb_rdonly(sb) && sb->s_op->sync_fs)
80 sb->s_op->sync_fs(sb, *(int *)arg);
81}
82
83static void fdatawrite_one_bdev(struct block_device *bdev, void *arg)
84{
85 filemap_fdatawrite(bdev->bd_inode->i_mapping);
86}
87
88static void fdatawait_one_bdev(struct block_device *bdev, void *arg)
89{
90 /*
91 * We keep the error status of individual mapping so that
92 * applications can catch the writeback error using fsync(2).
93 * See filemap_fdatawait_keep_errors() for details.
94 */
95 filemap_fdatawait_keep_errors(bdev->bd_inode->i_mapping);
96}
97
98/*
99 * Sync everything. We start by waking flusher threads so that most of
100 * writeback runs on all devices in parallel. Then we sync all inodes reliably
101 * which effectively also waits for all flusher threads to finish doing
102 * writeback. At this point all data is on disk so metadata should be stable
103 * and we tell filesystems to sync their metadata via ->sync_fs() calls.
104 * Finally, we writeout all block devices because some filesystems (e.g. ext2)
105 * just write metadata (such as inodes or bitmaps) to block device page cache
106 * and do not sync it on their own in ->sync_fs().
107 */
108void ksys_sync(void)
109{
110 int nowait = 0, wait = 1;
111
112 wakeup_flusher_threads(WB_REASON_SYNC);
113 iterate_supers(sync_inodes_one_sb, NULL);
114 iterate_supers(sync_fs_one_sb, &nowait);
115 iterate_supers(sync_fs_one_sb, &wait);
116 iterate_bdevs(fdatawrite_one_bdev, NULL);
117 iterate_bdevs(fdatawait_one_bdev, NULL);
118 if (unlikely(laptop_mode))
119 laptop_sync_completion();
120}
121
122SYSCALL_DEFINE0(sync)
123{
124 ksys_sync();
125 return 0;
126}
127
128static void do_sync_work(struct work_struct *work)
129{
130 int nowait = 0;
131
132 /*
133 * Sync twice to reduce the possibility we skipped some inodes / pages
134 * because they were temporarily locked
135 */
136 iterate_supers(sync_inodes_one_sb, &nowait);
137 iterate_supers(sync_fs_one_sb, &nowait);
138 iterate_bdevs(fdatawrite_one_bdev, NULL);
139 iterate_supers(sync_inodes_one_sb, &nowait);
140 iterate_supers(sync_fs_one_sb, &nowait);
141 iterate_bdevs(fdatawrite_one_bdev, NULL);
142 printk("Emergency Sync complete\n");
143 kfree(work);
144}
145
146void emergency_sync(void)
147{
148 struct work_struct *work;
149
150 work = kmalloc(sizeof(*work), GFP_ATOMIC);
151 if (work) {
152 INIT_WORK(work, do_sync_work);
153 schedule_work(work);
154 }
155}
156
157/*
158 * sync a single super
159 */
160SYSCALL_DEFINE1(syncfs, int, fd)
161{
162 struct fd f = fdget(fd);
163 struct super_block *sb;
164 int ret;
165
166 if (!f.file)
167 return -EBADF;
168 sb = f.file->f_path.dentry->d_sb;
169
170 down_read(&sb->s_umount);
171 ret = sync_filesystem(sb);
172 up_read(&sb->s_umount);
173
174 fdput(f);
175 return ret;
176}
177
178/**
179 * vfs_fsync_range - helper to sync a range of data & metadata to disk
180 * @file: file to sync
181 * @start: offset in bytes of the beginning of data range to sync
182 * @end: offset in bytes of the end of data range (inclusive)
183 * @datasync: perform only datasync
184 *
185 * Write back data in range @start..@end and metadata for @file to disk. If
186 * @datasync is set only metadata needed to access modified file data is
187 * written.
188 */
189int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
190{
191 struct inode *inode = file->f_mapping->host;
192
193 if (!file->f_op->fsync)
194 return -EINVAL;
195 if (!datasync && (inode->i_state & I_DIRTY_TIME))
196 mark_inode_dirty_sync(inode);
197 return file->f_op->fsync(file, start, end, datasync);
198}
199EXPORT_SYMBOL(vfs_fsync_range);
200
201/**
202 * vfs_fsync - perform a fsync or fdatasync on a file
203 * @file: file to sync
204 * @datasync: only perform a fdatasync operation
205 *
206 * Write back data and metadata for @file to disk. If @datasync is
207 * set only metadata needed to access modified file data is written.
208 */
209int vfs_fsync(struct file *file, int datasync)
210{
211 return vfs_fsync_range(file, 0, LLONG_MAX, datasync);
212}
213EXPORT_SYMBOL(vfs_fsync);
214
215static int do_fsync(unsigned int fd, int datasync)
216{
217 struct fd f = fdget(fd);
218 int ret = -EBADF;
219
220 if (f.file) {
221 ret = vfs_fsync(f.file, datasync);
222 fdput(f);
223 }
224 return ret;
225}
226
227SYSCALL_DEFINE1(fsync, unsigned int, fd)
228{
229 return do_fsync(fd, 0);
230}
231
232SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
233{
234 return do_fsync(fd, 1);
235}
236
237/*
238 * sys_sync_file_range() permits finely controlled syncing over a segment of
239 * a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
240 * zero then sys_sync_file_range() will operate from offset out to EOF.
241 *
242 * The flag bits are:
243 *
244 * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
245 * before performing the write.
246 *
247 * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
248 * range which are not presently under writeback. Note that this may block for
249 * significant periods due to exhaustion of disk request structures.
250 *
251 * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
252 * after performing the write.
253 *
254 * Useful combinations of the flag bits are:
255 *
256 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
257 * in the range which were dirty on entry to sys_sync_file_range() are placed
258 * under writeout. This is a start-write-for-data-integrity operation.
259 *
260 * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
261 * are not presently under writeout. This is an asynchronous flush-to-disk
262 * operation. Not suitable for data integrity operations.
263 *
264 * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
265 * completion of writeout of all pages in the range. This will be used after an
266 * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
267 * for that operation to complete and to return the result.
268 *
269 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER:
270 * a traditional sync() operation. This is a write-for-data-integrity operation
271 * which will ensure that all pages in the range which were dirty on entry to
272 * sys_sync_file_range() are committed to disk.
273 *
274 *
275 * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
276 * I/O errors or ENOSPC conditions and will return those to the caller, after
277 * clearing the EIO and ENOSPC flags in the address_space.
278 *
279 * It should be noted that none of these operations write out the file's
280 * metadata. So unless the application is strictly performing overwrites of
281 * already-instantiated disk blocks, there are no guarantees here that the data
282 * will be available after a crash.
283 */
284int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
285 unsigned int flags)
286{
287 int ret;
288 struct fd f;
289 struct address_space *mapping;
290 loff_t endbyte; /* inclusive */
291 umode_t i_mode;
292
293 ret = -EINVAL;
294 if (flags & ~VALID_FLAGS)
295 goto out;
296
297 endbyte = offset + nbytes;
298
299 if ((s64)offset < 0)
300 goto out;
301 if ((s64)endbyte < 0)
302 goto out;
303 if (endbyte < offset)
304 goto out;
305
306 if (sizeof(pgoff_t) == 4) {
307 if (offset >= (0x100000000ULL << PAGE_SHIFT)) {
308 /*
309 * The range starts outside a 32 bit machine's
310 * pagecache addressing capabilities. Let it "succeed"
311 */
312 ret = 0;
313 goto out;
314 }
315 if (endbyte >= (0x100000000ULL << PAGE_SHIFT)) {
316 /*
317 * Out to EOF
318 */
319 nbytes = 0;
320 }
321 }
322
323 if (nbytes == 0)
324 endbyte = LLONG_MAX;
325 else
326 endbyte--; /* inclusive */
327
328 ret = -EBADF;
329 f = fdget(fd);
330 if (!f.file)
331 goto out;
332
333 i_mode = file_inode(f.file)->i_mode;
334 ret = -ESPIPE;
335 if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
336 !S_ISLNK(i_mode))
337 goto out_put;
338
339 mapping = f.file->f_mapping;
340 ret = 0;
341 if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
342 ret = file_fdatawait_range(f.file, offset, endbyte);
343 if (ret < 0)
344 goto out_put;
345 }
346
347 if (flags & SYNC_FILE_RANGE_WRITE) {
348 ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
349 WB_SYNC_NONE);
350 if (ret < 0)
351 goto out_put;
352 }
353
354 if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
355 ret = file_fdatawait_range(f.file, offset, endbyte);
356
357out_put:
358 fdput(f);
359out:
360 return ret;
361}
362
363SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
364 unsigned int, flags)
365{
366 return ksys_sync_file_range(fd, offset, nbytes, flags);
367}
368
369/* It would be nice if people remember that not all the world's an i386
370 when they introduce new system calls */
371SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
372 loff_t, offset, loff_t, nbytes)
373{
374 return ksys_sync_file_range(fd, offset, nbytes, flags);
375}
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/slab.h>
9#include <linux/export.h>
10#include <linux/namei.h>
11#include <linux/sched.h>
12#include <linux/writeback.h>
13#include <linux/syscalls.h>
14#include <linux/linkage.h>
15#include <linux/pagemap.h>
16#include <linux/quotaops.h>
17#include <linux/backing-dev.h>
18#include "internal.h"
19
20#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
21 SYNC_FILE_RANGE_WAIT_AFTER)
22
23/*
24 * Do the filesystem syncing work. For simple filesystems
25 * writeback_inodes_sb(sb) just dirties buffers with inodes so we have to
26 * submit IO for these buffers via __sync_blockdev(). This also speeds up the
27 * wait == 1 case since in that case write_inode() functions do
28 * sync_dirty_buffer() and thus effectively write one block at a time.
29 */
30static int __sync_filesystem(struct super_block *sb, int wait)
31{
32 if (wait)
33 sync_inodes_sb(sb);
34 else
35 writeback_inodes_sb(sb, WB_REASON_SYNC);
36
37 if (sb->s_op->sync_fs)
38 sb->s_op->sync_fs(sb, wait);
39 return __sync_blockdev(sb->s_bdev, wait);
40}
41
42/*
43 * Write out and wait upon all dirty data associated with this
44 * superblock. Filesystem data as well as the underlying block
45 * device. Takes the superblock lock.
46 */
47int sync_filesystem(struct super_block *sb)
48{
49 int ret;
50
51 /*
52 * We need to be protected against the filesystem going from
53 * r/o to r/w or vice versa.
54 */
55 WARN_ON(!rwsem_is_locked(&sb->s_umount));
56
57 /*
58 * No point in syncing out anything if the filesystem is read-only.
59 */
60 if (sb->s_flags & MS_RDONLY)
61 return 0;
62
63 ret = __sync_filesystem(sb, 0);
64 if (ret < 0)
65 return ret;
66 return __sync_filesystem(sb, 1);
67}
68EXPORT_SYMBOL_GPL(sync_filesystem);
69
70static void sync_inodes_one_sb(struct super_block *sb, void *arg)
71{
72 if (!(sb->s_flags & MS_RDONLY))
73 sync_inodes_sb(sb);
74}
75
76static void sync_fs_one_sb(struct super_block *sb, void *arg)
77{
78 if (!(sb->s_flags & MS_RDONLY) && sb->s_op->sync_fs)
79 sb->s_op->sync_fs(sb, *(int *)arg);
80}
81
82static void fdatawrite_one_bdev(struct block_device *bdev, void *arg)
83{
84 filemap_fdatawrite(bdev->bd_inode->i_mapping);
85}
86
87static void fdatawait_one_bdev(struct block_device *bdev, void *arg)
88{
89 filemap_fdatawait(bdev->bd_inode->i_mapping);
90}
91
92/*
93 * Sync everything. We start by waking flusher threads so that most of
94 * writeback runs on all devices in parallel. Then we sync all inodes reliably
95 * which effectively also waits for all flusher threads to finish doing
96 * writeback. At this point all data is on disk so metadata should be stable
97 * and we tell filesystems to sync their metadata via ->sync_fs() calls.
98 * Finally, we writeout all block devices because some filesystems (e.g. ext2)
99 * just write metadata (such as inodes or bitmaps) to block device page cache
100 * and do not sync it on their own in ->sync_fs().
101 */
102SYSCALL_DEFINE0(sync)
103{
104 int nowait = 0, wait = 1;
105
106 wakeup_flusher_threads(0, WB_REASON_SYNC);
107 iterate_supers(sync_inodes_one_sb, NULL);
108 iterate_supers(sync_fs_one_sb, &nowait);
109 iterate_supers(sync_fs_one_sb, &wait);
110 iterate_bdevs(fdatawrite_one_bdev, NULL);
111 iterate_bdevs(fdatawait_one_bdev, NULL);
112 if (unlikely(laptop_mode))
113 laptop_sync_completion();
114 return 0;
115}
116
117static void do_sync_work(struct work_struct *work)
118{
119 int nowait = 0;
120
121 /*
122 * Sync twice to reduce the possibility we skipped some inodes / pages
123 * because they were temporarily locked
124 */
125 iterate_supers(sync_inodes_one_sb, &nowait);
126 iterate_supers(sync_fs_one_sb, &nowait);
127 iterate_bdevs(fdatawrite_one_bdev, NULL);
128 iterate_supers(sync_inodes_one_sb, &nowait);
129 iterate_supers(sync_fs_one_sb, &nowait);
130 iterate_bdevs(fdatawrite_one_bdev, NULL);
131 printk("Emergency Sync complete\n");
132 kfree(work);
133}
134
135void emergency_sync(void)
136{
137 struct work_struct *work;
138
139 work = kmalloc(sizeof(*work), GFP_ATOMIC);
140 if (work) {
141 INIT_WORK(work, do_sync_work);
142 schedule_work(work);
143 }
144}
145
146/*
147 * sync a single super
148 */
149SYSCALL_DEFINE1(syncfs, int, fd)
150{
151 struct fd f = fdget(fd);
152 struct super_block *sb;
153 int ret;
154
155 if (!f.file)
156 return -EBADF;
157 sb = f.file->f_dentry->d_sb;
158
159 down_read(&sb->s_umount);
160 ret = sync_filesystem(sb);
161 up_read(&sb->s_umount);
162
163 fdput(f);
164 return ret;
165}
166
167/**
168 * vfs_fsync_range - helper to sync a range of data & metadata to disk
169 * @file: file to sync
170 * @start: offset in bytes of the beginning of data range to sync
171 * @end: offset in bytes of the end of data range (inclusive)
172 * @datasync: perform only datasync
173 *
174 * Write back data in range @start..@end and metadata for @file to disk. If
175 * @datasync is set only metadata needed to access modified file data is
176 * written.
177 */
178int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
179{
180 if (!file->f_op->fsync)
181 return -EINVAL;
182 return file->f_op->fsync(file, start, end, datasync);
183}
184EXPORT_SYMBOL(vfs_fsync_range);
185
186/**
187 * vfs_fsync - perform a fsync or fdatasync on a file
188 * @file: file to sync
189 * @datasync: only perform a fdatasync operation
190 *
191 * Write back data and metadata for @file to disk. If @datasync is
192 * set only metadata needed to access modified file data is written.
193 */
194int vfs_fsync(struct file *file, int datasync)
195{
196 return vfs_fsync_range(file, 0, LLONG_MAX, datasync);
197}
198EXPORT_SYMBOL(vfs_fsync);
199
200static int do_fsync(unsigned int fd, int datasync)
201{
202 struct fd f = fdget(fd);
203 int ret = -EBADF;
204
205 if (f.file) {
206 ret = vfs_fsync(f.file, datasync);
207 fdput(f);
208 }
209 return ret;
210}
211
212SYSCALL_DEFINE1(fsync, unsigned int, fd)
213{
214 return do_fsync(fd, 0);
215}
216
217SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
218{
219 return do_fsync(fd, 1);
220}
221
222/*
223 * sys_sync_file_range() permits finely controlled syncing over a segment of
224 * a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
225 * zero then sys_sync_file_range() will operate from offset out to EOF.
226 *
227 * The flag bits are:
228 *
229 * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
230 * before performing the write.
231 *
232 * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
233 * range which are not presently under writeback. Note that this may block for
234 * significant periods due to exhaustion of disk request structures.
235 *
236 * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
237 * after performing the write.
238 *
239 * Useful combinations of the flag bits are:
240 *
241 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
242 * in the range which were dirty on entry to sys_sync_file_range() are placed
243 * under writeout. This is a start-write-for-data-integrity operation.
244 *
245 * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
246 * are not presently under writeout. This is an asynchronous flush-to-disk
247 * operation. Not suitable for data integrity operations.
248 *
249 * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
250 * completion of writeout of all pages in the range. This will be used after an
251 * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
252 * for that operation to complete and to return the result.
253 *
254 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER:
255 * a traditional sync() operation. This is a write-for-data-integrity operation
256 * which will ensure that all pages in the range which were dirty on entry to
257 * sys_sync_file_range() are committed to disk.
258 *
259 *
260 * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
261 * I/O errors or ENOSPC conditions and will return those to the caller, after
262 * clearing the EIO and ENOSPC flags in the address_space.
263 *
264 * It should be noted that none of these operations write out the file's
265 * metadata. So unless the application is strictly performing overwrites of
266 * already-instantiated disk blocks, there are no guarantees here that the data
267 * will be available after a crash.
268 */
269SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
270 unsigned int, flags)
271{
272 int ret;
273 struct fd f;
274 struct address_space *mapping;
275 loff_t endbyte; /* inclusive */
276 umode_t i_mode;
277
278 ret = -EINVAL;
279 if (flags & ~VALID_FLAGS)
280 goto out;
281
282 endbyte = offset + nbytes;
283
284 if ((s64)offset < 0)
285 goto out;
286 if ((s64)endbyte < 0)
287 goto out;
288 if (endbyte < offset)
289 goto out;
290
291 if (sizeof(pgoff_t) == 4) {
292 if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
293 /*
294 * The range starts outside a 32 bit machine's
295 * pagecache addressing capabilities. Let it "succeed"
296 */
297 ret = 0;
298 goto out;
299 }
300 if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
301 /*
302 * Out to EOF
303 */
304 nbytes = 0;
305 }
306 }
307
308 if (nbytes == 0)
309 endbyte = LLONG_MAX;
310 else
311 endbyte--; /* inclusive */
312
313 ret = -EBADF;
314 f = fdget(fd);
315 if (!f.file)
316 goto out;
317
318 i_mode = file_inode(f.file)->i_mode;
319 ret = -ESPIPE;
320 if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
321 !S_ISLNK(i_mode))
322 goto out_put;
323
324 mapping = f.file->f_mapping;
325 if (!mapping) {
326 ret = -EINVAL;
327 goto out_put;
328 }
329
330 ret = 0;
331 if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
332 ret = filemap_fdatawait_range(mapping, offset, endbyte);
333 if (ret < 0)
334 goto out_put;
335 }
336
337 if (flags & SYNC_FILE_RANGE_WRITE) {
338 ret = filemap_fdatawrite_range(mapping, offset, endbyte);
339 if (ret < 0)
340 goto out_put;
341 }
342
343 if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
344 ret = filemap_fdatawait_range(mapping, offset, endbyte);
345
346out_put:
347 fdput(f);
348out:
349 return ret;
350}
351
352/* It would be nice if people remember that not all the world's an i386
353 when they introduce new system calls */
354SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
355 loff_t, offset, loff_t, nbytes)
356{
357 return sys_sync_file_range(fd, offset, nbytes, flags);
358}