NeilBrown 72626685dc [PATCH] md: add write-intent-bitmap support to raid5 ... Most awkward part of this is delaying write requests until bitmap updates have been flushed. To achieve this, we have a sequence number (seq_flush) which is incremented each time the raid5 is unplugged. If the raid thread notices that this has changed, it flushes bitmap changes, and assigned the value of seq_flush to seq_write. When a write request arrives, it is given the number from seq_write, and that write request may not complete until seq_flush is larger than the saved seq number. We have a new queue for storing stripes which are waiting for a bitmap flush and an extra flag for stripes to record if the write was 'degraded' and so should not clear the a bit in the bitmap. 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>		2005-09-09 16:39:12 -07:00
..
bitmap.h	[PATCH] md: add write-behind support for md/raid1	2005-09-09 16:39:10 -07:00
linear.h	[PATCH] md: support md/linear array with components greater than 2 terabytes.	2005-09-09 16:39:10 -07:00
md_k.h	[PATCH] md: limit size of sb read/written to appropriate amount	2005-09-09 16:39:12 -07:00
md_p.h	[PATCH] md: allow md to load a superblock with feature-bit '1' set	2005-09-09 16:39:11 -07:00
md_u.h
md.h
multipath.h
raid0.h
raid1.h	[PATCH] md: add write-behind support for md/raid1	2005-09-09 16:39:10 -07:00
raid5.h	[PATCH] md: add write-intent-bitmap support to raid5	2005-09-09 16:39:12 -07:00
raid10.h
xor.h