linux.git/drivers/md/raid5.c, branch v2.6.15

[PATCH] md: use correct size of raid5 stripe cache when measuring how full it is

2005-12-12T17:06:04+00:00

The raid5 stripe cache was recently changed from fixed size (NR_STRIPES) to
variable size (conf->max_nr_stripes).  However there are two places that still
use the constant and as a result, reducing the size of the stripe cache can
result in a deadlock.

Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] md: fix locking problem in r5/r6

2005-11-28T22:42:25+00:00

bitmap_unplug actually writes data (bits) to storage, so we shouldn't be
holding a spinlock...

Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] md: fix some locking and module refcounting issues with md's use of sysfs

2005-11-09T15:56:39+00:00

1/ I really should be using the __ATTR macros for defining attributes, so
   that the .owner field get set properly, otherwise modules can be removed
   while sysfs files are open.  This also involves some name changes of _show
   routines.

2/ Always lock the mddev (against reconfiguration) for all sysfs attribute
   access.  This easily avoid certain races and is completely consistant with
   other interfaces (ioctl and /proc/mdstat both always lock against
   reconfiguration).

3/ raid5 attributes must check that the 'conf' structure actually exists
   (the array could have been stopped while an attribute file was open).

4/ A missing 'kfree' from when the raid5_conf_t was converted to have a
   kobject embedded, and then converted back again.

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

[PATCH] md: make sure a user-request sync of raid5 ignores intent bitmap

2005-11-09T15:56:39+00:00

A sync of raid5 usually ignore blocks which the bitmap says are in-sync.  But
a user-request check or repair should not ignore these.

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

2005-11-09T15:56:38+00:00

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

[PATCH] md: improvements to raid5 handling of read errors

2005-11-09T15:56:38+00:00

Two refinements to the 'attempt-overwrite-on-read-error' mechanism.
1/ If the array is read-only, don't attempt an over-write.
2/ If there are more than max_nr_stripes read errors on a device with
   no success, fail the drive.  This will make sure a dead
   drive will be eventually kicked even when we aren't trying
   to rewrite (which would normally kick a dead drive more quickly.

Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] md: change raid5 sysfs attribute to not create a new directory

2005-11-09T15:56:38+00:00

There isn't really a need for raid5 attributes to be an a subdirectory,
so this patch moves them from
  /sys/block/mdX/md/raid5/attribute
to
  /sys/block/mdX/md/attribute

This suggests that all md personalities should co-operate about
namespace usage, but that shouldn't be a problem.

Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] md: fix ref-counting problems with kobjects in md

2005-11-09T15:56:37+00:00

Thanks Greg.

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

[PATCH] md: provide proper rcu_dereference / rcu_assign_pointer annotations in md

2005-11-09T15:56:37+00:00

Acked-by: 
Signed-off-by: Suzanne Wood 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] md: teach raid5 the difference between 'check' and 'repair'.

2005-11-09T15:56:37+00:00

With this, raid5 can be asked to check parity without repairing it.  It also
keeps a count of the number of incorrect parity blocks found (mismatches) and
reports them through sysfs.

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