tree 95a8b9228534cebb12eb31c1cc9cc0c45f685410
parent fca4d848f0e6fafdc2b25f8a0cf1e76935f13ac2
author NeilBrown <neilb@cse.unsw.edu.au> 1119399432 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119406063 -0700

[PATCH] md: improve locking on 'safemode' and move superblock writes

When md marks the superblock dirty before a write, it calls
generic_make_request (to write the superblock) from within
generic_make_request (to write the first dirty block), which could cause
problems later.

With this patch, the superblock write is always done by the helper thread, and
write request are delayed until that write completes.

Also, the locking around marking the array dirty and writing the superblock is
improved to avoid possible races.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>