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ext3: Flush disk caches on fsync when needed 

In case we fsync() a file and inode is not dirty, we don't force a transaction
to disk and hence don't flush disk caches. Thus file data could be just in disk
caches and not on persistent storage. Fix the problem by flushing disk caches
if we didn't force a transaction commit.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2009-09-08 14:59:42 +02:00
parent 4f003fd32b
commit 56fcad29d4
1 changed files with 11 additions and 1 deletions
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12
fs/ext3/fsync.c
View File

@ -23,6 +23,7 @@
*/ */
#include <linux/time.h> #include <linux/time.h>
#include <linux/blkdev.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/writeback.h> #include <linux/writeback.h>
@ -73,7 +74,7 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
} }
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
goto out; goto flush;
/* /*
* The VFS has written the file data. If the inode is unaltered * The VFS has written the file data. If the inode is unaltered
@ -85,7 +86,16 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
.nr_to_write = 0, /* sys_fsync did this */ .nr_to_write = 0, /* sys_fsync did this */
}; };
ret = sync_inode(inode, &wbc); ret = sync_inode(inode, &wbc);
goto out;
} }
flush:
/*
* In case we didn't commit a transaction, we have to flush
* disk caches manually so that data really is on persistent
* storage
*/
if (test_opt(inode->i_sb, BARRIER))
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
out: out:
return ret; return ret;
} }