Neil Brown da6e1a32fb [PATCH] md: avoid possible BUG_ON in md bitmap handling ... md/bitmap tracks how many active write requests are pending on blocks associated with each bit in the bitmap, so that it knows when it can clear the bit (when count hits zero). The counter has 14 bits of space, so if there are ever more than 16383, we cannot cope. Currently the code just calles BUG_ON as "all" drivers have request queue limits much smaller than this. However is seems that some don't. Apparently some multipath configurations can allow more than 16383 concurrent write requests. So, in this unlikely situation, instead of calling BUG_ON we now wait for the count to drop down a bit. This requires a new wait_queue_head, some waiting code, and a wakeup call. Tested by limiting the counter to 20 instead of 16383 (writes go a lot slower in that case...). Signed-off-by: Neil Brown <neilb@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-02-09 09:25:47 -08:00
..
bitmap.h	[PATCH] md: avoid possible BUG_ON in md bitmap handling	2007-02-09 09:25:47 -08:00
Kbuild	[HEADERS] One line per header in Kbuild files to reduce conflicts	2006-09-19 12:43:58 +01:00
linear.h	[PATCH] md: allow a linear array to have drives added while active	2006-06-26 09:58:37 -07:00
md_k.h	[PATCH] md: remove MAX_MD_DEVS which is an arbitrary limit	2006-10-03 08:04:18 -07:00
md_p.h	[PATCH] md: endian annotation for v1 superblock access	2006-10-21 13:35:05 -07:00
md_u.h	[PATCH] md: the scheduled removal of the START_ARRAY ioctl for md	2006-10-03 08:04:16 -07:00
md.h	[PATCH] md: fix potential memalloc deadlock in md	2007-01-26 13:51:00 -08:00
multipath.h
raid0.h
raid1.h	[PATCH] md: Remove working_disks from raid1 state data	2006-10-03 08:04:17 -07:00
raid5.h	[PATCH] md: allow reads that have bypassed the cache to be retried on failure	2006-12-10 09:57:20 -08:00
raid10.h	[PATCH] md: remove 'working_disks' from raid10 state	2006-10-03 08:04:17 -07:00
xor.h