Commit 9c0bc567 authored by NeilBrown's avatar NeilBrown Committed by Luis Henriques

md/bitmap: always wait for writes on unplug.

commit 4b5060dd upstream.

If two threads call bitmap_unplug at the same time, then
one might schedule all the writes, and the other might
decide that it doesn't need to wait.  But really it does.

It rarely hurts to wait when it isn't absolutely necessary,
and the current code doesn't really focus on 'absolutely necessary'
anyway.  So just wait always.

This can potentially lead to data corruption if a crash happens
at an awkward time and data was written before the bitmap was
updated.  It is very unlikely, but this should go to -stable
just to be safe.  Appropriate for any -stable.
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent dedddea7
......@@ -879,7 +879,6 @@ void bitmap_unplug(struct bitmap *bitmap)
{
unsigned long i;
int dirty, need_write;
int wait = 0;
if (!bitmap || !bitmap->storage.filemap ||
test_bit(BITMAP_STALE, &bitmap->flags))
......@@ -897,16 +896,13 @@ void bitmap_unplug(struct bitmap *bitmap)
clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
write_page(bitmap, bitmap->storage.filemap[i], 0);
}
if (dirty)
wait = 1;
}
if (wait) { /* if any writes were performed, we need to wait on them */
if (bitmap->storage.file)
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
else
md_super_wait(bitmap->mddev);
}
if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
bitmap_file_kick(bitmap);
}
......
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