linux/drivers/md/multipath.c, branch v2.6.19

[PATCH] md: fix up maintenance of ->degraded in multipath

2006-10-28T18:30:51Z

A recent fix which made sure ->degraded was initialised properly exposed a second bug - ->degraded wasn't been updated when drives failed or were hot-added. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: fix calculation of ->degraded for multipath and raid10

2006-10-21T20:35:05Z

Two less-used md personalities have bugs in the calculation of ->degraded (the extent to which the array is degraded). Signed-off-by: Neil Brown Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: define ->congested_fn for raid1, raid10, and multipath

2006-10-03T15:04:18Z

raid1, raid10 and multipath don't report their 'congested' status through bdi_*_congested, but should. This patch adds the appropriate functions which just check the 'congested' status of all active members (with appropriate locking). raid1 read_balance should be modified to prefer devices where bdi_read_congested returns false. Then we could use the '&' branch rather than the '|' branch. However that should would need some benchmarking first to make sure it is actually a good idea. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: replace magic numbers in sb_dirty with well defined bit flags

2006-10-03T15:04:17Z

Instead of magic numbers (0,1,2,3) in sb_dirty, we have some flags instead: MD_CHANGE_DEVS Some device state has changed requiring superblock update on all devices. MD_CHANGE_CLEAN The array has transitions from 'clean' to 'dirty' or back, requiring a superblock update on active devices, but possibly not on spares MD_CHANGE_PENDING A superblock update is underway. We wait for an update to complete by waiting for all flags to be clear. A flag can be set at any time, even during an update, without risk that the change will be lost. Stop exporting md_update_sb - isn't needed. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] mempool: use common mempool kzalloc allocator

2006-03-26T16:56:59Z

This patch changes a mempool user, which is basically just a wrapper around kzalloc(), to use the common mempool_kmalloc/kfree, rather than its own wrapper function, removing duplicated code. Signed-off-by: Matthew Dobson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Decrease number of pointer derefs in multipath.c

2006-01-10T16:02:01Z

Decrease the number of pointer derefs in drivers/md/multipath.c Benefits of the patch: - Fewer pointer dereferences should make the code slightly faster. - Size of generated code is smaller - improved readability Signed-off-by: Jesper Juhl Acked-by: Ingo Molnar Cc: Alasdair G Kergon Acked-by: NeilBrown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: allow array level to be set textually via sysfs

2006-01-06T16:34:09Z

Signed-off-by: Neil Brown Acked-by: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: remove personality numbering from md

2006-01-06T16:34:06Z

md supports multiple different RAID level, each being implemented by a 'personality' (which is often in a separate module). These personalities have fairly artificial 'numbers'. The numbers are use to: 1- provide an index into an array where the various personalities are recorded 2- identify the module (via an alias) which implements are particular personality. Neither of these uses really justify the existence of personality numbers. The array can be replaced by a linked list which is searched (array lookup only happens very rarely). Module identification can be done using an alias based on level rather than 'personality' number. The current 'raid5' modules support two level (4 and 5) but only one personality. This slight awkwardness (which was handled in the mapping from level to personality) can be better handled by allowing raid5 to register 2 personalities. With this change in place, the core md module does not need to have an exhaustive list of all possible personalities, so other personalities can be added independently. This patch also moves the check for chunksize being non-zero into the ->run routines for the personalities that need it, rather than having it in core-md. This has a side effect of allowing 'faulty' and 'linear' not to have a chunk-size set. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: convert md to use kzalloc throughout

2006-01-06T16:34:05Z

Replace multiple kmalloc/memset pairs with kzalloc calls. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] md: convert 'faulty' and 'in_sync' fields to bits in 'flags' field

2005-11-09T15:56:38Z

This has the advantage of removing the confusion caused by 'rdev_t' and 'mddev_t' both having 'in_sync' fields. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds