diff options
| author | NeilBrown <neilb@suse.de> | 2007-01-26 09:57:11 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 22:51:00 +0100 |
| commit | 2a2275d630b982e5f90206f9bc497f6695a3ec5d (patch) | |
| tree | 88cddee709b2107b74e5424810d4ffb6e3772382 /mm/truncate.c | |
| parent | [PATCH] knfsd: Fix type mismatch with filldir_t used by nfsd (diff) | |
| download | linux-2a2275d630b982e5f90206f9bc497f6695a3ec5d.tar.xz linux-2a2275d630b982e5f90206f9bc497f6695a3ec5d.zip | |
[PATCH] md: fix potential memalloc deadlock in md
If a GFP_KERNEL allocation is attempted in md while the mddev_lock is held,
it is possible for a deadlock to eventuate.
This happens if the array was marked 'clean', and the memalloc triggers a
write-out to the md device.
For the writeout to succeed, the array must be marked 'dirty', and that
requires getting the mddev_lock.
So, before attempting a GFP_KERNEL allocation while holding the lock, make
sure the array is marked 'dirty' (unless it is currently read-only).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
0 files changed, 0 insertions, 0 deletions