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authorJan Kara <jack@suse.cz>2009-04-27 16:43:48 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-11 21:36:03 -0400
commit5a3e5cb8e08bd876e2542c1451c9a93dab1b0e39 (patch)
tree3b792d21246f1001adeca8b67df24ca71593dd3f /fs/super.c
parent876a9f76abbcb775f8d21cbc99fa161f9e5937f1 (diff)
downloadlwn-5a3e5cb8e08bd876e2542c1451c9a93dab1b0e39.tar.gz
lwn-5a3e5cb8e08bd876e2542c1451c9a93dab1b0e39.zip
vfs: Fix sys_sync() and fsync_super() reliability (version 4)
So far, do_sync() called: sync_inodes(0); sync_supers(); sync_filesystems(0); sync_filesystems(1); sync_inodes(1); This ordering makes it kind of hard for filesystems as sync_inodes(0) need not submit all the IO (for example it skips inodes with I_SYNC set) so e.g. forcing transaction to disk in ->sync_fs() is not really enough. Therefore sys_sync has not been completely reliable on some filesystems (ext3, ext4, reiserfs, ocfs2 and others are hit by this) when racing e.g. with background writeback. A similar problem hits also other filesystems (e.g. ext2) because of write_supers() being called before the sync_inodes(1). Change the ordering of calls in do_sync() - this requires a new function sync_blockdevs() to preserve the property that block devices are always synced after write_super() / sync_fs() call. The same issue is fixed in __fsync_super() function used on umount / remount read-only. [AV: build fixes] Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/fs/super.c b/fs/super.c
index 3d9f117dd2a3..18d159dc1e40 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -293,6 +293,7 @@ void __fsync_super(struct super_block *sb)
{
sync_inodes_sb(sb, 0);
vfs_dq_sync(sb);
+ sync_inodes_sb(sb, 1);
lock_super(sb);
if (sb->s_dirt && sb->s_op->write_super)
sb->s_op->write_super(sb);
@@ -300,7 +301,6 @@ void __fsync_super(struct super_block *sb)
if (sb->s_op->sync_fs)
sb->s_op->sync_fs(sb, 1);
sync_blockdev(sb->s_bdev);
- sync_inodes_sb(sb, 1);
}
/*
@@ -522,6 +522,33 @@ restart:
mutex_unlock(&mutex);
}
+#ifdef CONFIG_BLOCK
+/*
+ * Sync all block devices underlying some superblock
+ */
+void sync_blockdevs(void)
+{
+ struct super_block *sb;
+
+ spin_lock(&sb_lock);
+restart:
+ list_for_each_entry(sb, &super_blocks, s_list) {
+ if (!sb->s_bdev)
+ continue;
+ sb->s_count++;
+ spin_unlock(&sb_lock);
+ down_read(&sb->s_umount);
+ if (sb->s_root)
+ sync_blockdev(sb->s_bdev);
+ up_read(&sb->s_umount);
+ spin_lock(&sb_lock);
+ if (__put_super_and_need_restart(sb))
+ goto restart;
+ }
+ spin_unlock(&sb_lock);
+}
+#endif
+
/**
* get_super - get the superblock of a device
* @bdev: device to get the superblock for