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authorJan Kara <jack@suse.cz>2012-07-03 16:45:32 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:58:49 +0400
commita8c7176b6ded413d5044a00f1d05477b95a6d7ad (patch)
treea2b3e075b7181ac100b13a4f9b57ae6628407a5f
parent5c0d6b60a0ba46d45020547eacf7199171920935 (diff)
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vfs: Make sys_sync writeout also block device inodes
In case block device does not have filesystem mounted on it, sys_sync will just ignore it and doesn't writeout its dirty pages. This is because writeback code avoids writing inodes from superblock without backing device and blockdev_superblock is such a superblock. Since it's unexpected that sync doesn't writeout dirty data for block devices be nice to users and change the behavior to do so. So now we iterate over all block devices on blockdev_super instead of iterating over all superblocks when syncing block devices. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/sync.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/fs/sync.c b/fs/sync.c
index 490e90201135..0b166f26362d 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -85,10 +85,14 @@ static void sync_fs_one_sb(struct super_block *sb, void *arg)
sb->s_op->sync_fs(sb, *(int *)arg);
}
-static void sync_blkdev_one_sb(struct super_block *sb, void *arg)
+static void flush_one_bdev(struct block_device *bdev, void *arg)
{
- if (!(sb->s_flags & MS_RDONLY))
- __sync_blockdev(sb->s_bdev, *(int *)arg);
+ __sync_blockdev(bdev, 0);
+}
+
+static void sync_one_bdev(struct block_device *bdev, void *arg)
+{
+ sync_blockdev(bdev);
}
/*
@@ -102,10 +106,10 @@ SYSCALL_DEFINE0(sync)
wakeup_flusher_threads(0, WB_REASON_SYNC);
iterate_supers(writeback_inodes_one_sb, NULL);
iterate_supers(sync_fs_one_sb, &nowait);
- iterate_supers(sync_blkdev_one_sb, &nowait);
+ iterate_bdevs(flush_one_bdev, NULL);
iterate_supers(sync_inodes_one_sb, NULL);
iterate_supers(sync_fs_one_sb, &wait);
- iterate_supers(sync_blkdev_one_sb, &wait);
+ iterate_bdevs(sync_one_bdev, NULL);
if (unlikely(laptop_mode))
laptop_sync_completion();
return 0;
@@ -121,10 +125,10 @@ static void do_sync_work(struct work_struct *work)
*/
iterate_supers(sync_inodes_one_sb, &nowait);
iterate_supers(sync_fs_one_sb, &nowait);
- iterate_supers(sync_blkdev_one_sb, &nowait);
+ iterate_bdevs(flush_one_bdev, NULL);
iterate_supers(sync_inodes_one_sb, &nowait);
iterate_supers(sync_fs_one_sb, &nowait);
- iterate_supers(sync_blkdev_one_sb, &nowait);
+ iterate_bdevs(flush_one_bdev, NULL);
printk("Emergency Sync complete\n");
kfree(work);
}