#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/fs.h>
+#include <linux/slab.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
+#include <linux/backing-dev.h>
#include "internal.h"
#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
*/
static int __sync_filesystem(struct super_block *sb, int wait)
{
- /* Avoid doing twice syncing and cache pruning for quota sync */
- if (!wait) {
- writeout_quota_sb(sb, -1);
- writeback_inodes_sb(sb);
- } else {
- sync_quota_sb(sb, -1);
+ /*
+ * This should be safe, as we require bdi backing to actually
+ * write out data in the first place
+ */
+ if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
+ return 0;
+
+ if (sb->s_qcop && sb->s_qcop->quota_sync)
+ sb->s_qcop->quota_sync(sb, -1, wait);
+
+ if (wait)
sync_inodes_sb(sb);
- }
+ else
+ writeback_inodes_sb_locked(sb);
+
if (sb->s_op->sync_fs)
sb->s_op->sync_fs(sb, wait);
return __sync_blockdev(sb->s_bdev, wait);
}
EXPORT_SYMBOL_GPL(sync_filesystem);
+static void sync_one_sb(struct super_block *sb, void *arg)
+{
+ if (!(sb->s_flags & MS_RDONLY) && sb->s_bdi)
+ __sync_filesystem(sb, *(int *)arg);
+}
/*
* Sync all the data for all the filesystems (called by sys_sync() and
* emergency sync)
- *
- * This operation is careful to avoid the livelock which could easily happen
- * if two or more filesystems are being continuously dirtied. s_need_sync
- * is used only here. We set it against all filesystems and then clear it as
- * we sync them. So redirtied filesystems are skipped.
- *
- * But if process A is currently running sync_filesystems and then process B
- * calls sync_filesystems as well, process B will set all the s_need_sync
- * flags again, which will cause process A to resync everything. Fix that with
- * a local mutex.
*/
static void sync_filesystems(int wait)
{
- struct super_block *sb;
- static DEFINE_MUTEX(mutex);
-
- mutex_lock(&mutex); /* Could be down_interruptible */
- spin_lock(&sb_lock);
- list_for_each_entry(sb, &super_blocks, s_list)
- sb->s_need_sync = 1;
-
-restart:
- list_for_each_entry(sb, &super_blocks, s_list) {
- if (!sb->s_need_sync)
- continue;
- sb->s_need_sync = 0;
- sb->s_count++;
- spin_unlock(&sb_lock);
-
- down_read(&sb->s_umount);
- if (!(sb->s_flags & MS_RDONLY) && sb->s_root)
- __sync_filesystem(sb, wait);
- up_read(&sb->s_umount);
-
- /* restart only when sb is no longer on the list */
- spin_lock(&sb_lock);
- if (__put_super_and_need_restart(sb))
- goto restart;
- }
- spin_unlock(&sb_lock);
- mutex_unlock(&mutex);
+ iterate_supers(sync_one_sb, &wait);
}
/*
ret = err;
return ret;
}
+EXPORT_SYMBOL(file_fsync);
/**
* vfs_fsync_range - helper to sync a range of data & metadata to disk
* @file: file to sync
- * @dentry: dentry of @file
* @start: offset in bytes of the beginning of data range to sync
* @end: offset in bytes of the end of data range (inclusive)
* @datasync: perform only datasync
* Write back data in range @start..@end 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_range(struct file *file, struct dentry *dentry, loff_t start,
- loff_t end, int datasync)
+int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
{
- const struct file_operations *fop;
- struct address_space *mapping;
+ struct address_space *mapping = file->f_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) {
+ if (!file->f_op || !file->f_op->fsync) {
ret = -EINVAL;
goto out;
}
- ret = filemap_fdatawrite_range(mapping, start, end);
+ ret = filemap_write_and_wait_range(mapping, start, end);
/*
* 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);
+ err = file->f_op->fsync(file, file->f_path.dentry, datasync);
if (!ret)
ret = err;
mutex_unlock(&mapping->host->i_mutex);
- err = filemap_fdatawait_range(mapping, start, end);
- if (!ret)
- ret = err;
out:
return ret;
}
/**
* vfs_fsync - perform a fsync or fdatasync on a file
* @file: file to sync
- * @dentry: dentry of @file
* @datasync: 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)
+int vfs_fsync(struct file *file, int datasync)
{
- return vfs_fsync_range(file, dentry, 0, LLONG_MAX, datasync);
+ return vfs_fsync_range(file, 0, LLONG_MAX, datasync);
}
EXPORT_SYMBOL(vfs_fsync);
file = fget(fd);
if (file) {
- ret = vfs_fsync(file, file->f_path.dentry, datasync);
+ ret = vfs_fsync(file, datasync);
fput(file);
}
return ret;
*/
int generic_write_sync(struct file *file, loff_t pos, loff_t count)
{
- if (!(file->f_flags & O_SYNC) && !IS_SYNC(file->f_mapping->host))
+ if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host))
return 0;
- return vfs_fsync_range(file, file->f_path.dentry, pos,
- pos + count - 1, 1);
+ return vfs_fsync_range(file, pos, pos + count - 1,
+ (file->f_flags & __O_SYNC) ? 0 : 1);
}
EXPORT_SYMBOL(generic_write_sync);
{
int ret;
struct file *file;
+ struct address_space *mapping;
loff_t endbyte; /* inclusive */
int fput_needed;
umode_t i_mode;
!S_ISLNK(i_mode))
goto out_put;
- ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
+ mapping = file->f_mapping;
+ if (!mapping) {
+ ret = -EINVAL;
+ goto out_put;
+ }
+
+ ret = 0;
+ if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
+ ret = filemap_fdatawait_range(mapping, offset, endbyte);
+ if (ret < 0)
+ goto out_put;
+ }
+
+ if (flags & SYNC_FILE_RANGE_WRITE) {
+ ret = filemap_fdatawrite_range(mapping, offset, endbyte);
+ if (ret < 0)
+ goto out_put;
+ }
+
+ if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
+ ret = filemap_fdatawait_range(mapping, offset, endbyte);
+
out_put:
fput_light(file, fput_needed);
out:
}
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff