linux-stable.git/drivers/md/raid0.c, branch linux-3.10.y

block: Change bio_split() to respect the current value of bi_idx

2013-03-23T21:15:30+00:00

In the current code bio_split() won't be seeing partially completed bios
so this doesn't change any behaviour, but this makes the code a bit
clearer as to what bio_split() actually requires.

The immediate purpose of the patch is removing unnecessary bi_idx
references, but the end goal is to allow partial completed bios to be
submitted, which along with immutable biovecs enables effecient bio
splitting.

Some of the callers were (double) checking that bios could be split, so
update their checks too.

Signed-off-by: Kent Overstreet 
CC: Jens Axboe 
CC: Lars Ellenberg 
CC: Neil Brown 
CC: Martin K. Petersen

block: Use bio_sectors() more consistently

2013-03-23T21:15:30+00:00

Bunch of places in the code weren't using it where they could be -
this'll reduce the size of the patch that puts bi_sector/bi_size/bi_idx
into a struct bvec_iter.

Signed-off-by: Kent Overstreet 
CC: Jens Axboe 
CC: "Ed L. Cashin" 
CC: Nick Piggin 
CC: Jiri Kosina 
CC: Jim Paris 
CC: Geoff Levand 
CC: Alasdair Kergon 
CC: dm-devel@redhat.com
CC: Neil Brown 
CC: Steven Rostedt 
Acked-by: Ed Cashin

md/raid0: improve error message when converting RAID4-with-spares to RAID0

2013-02-26T00:58:44+00:00

Mentioning "bad disk number -1" exposes irrelevant internal detail.
Just say they are inactive and must be removed.

Signed-off-by: NeilBrown

md: raid0: fix error return from create_stripe_zones.

2013-02-26T00:57:04+00:00

Create_stripe_zones returns an error slightly differently to
raid0_run and to raid0_takeover_*.

The error returned used by the second was wrong and an error would
result in mddev->private being set to NULL and sooner or later a
crash.

So never return NULL, return ERR_PTR(err), not NULL from
create_stripe_zones.

This bug has been present since 2.6.35 so the fix is suitable
for any kernel since then.

Cc: stable@vger.kernel.org
Signed-off-by: NeilBrown

md: fix two bugs when attempting to resize RAID0 array.

2013-02-26T00:55:40+00:00

You cannot resize a RAID0 array (in terms of making the devices
bigger), but the code doesn't entirely stop you.
So:

 disable setting of the available size on each device for
 RAID0 and Linear devices.  This must not change as doing so
 can change the effective layout of data.

 Make sure that the size that raid0_size() reports is accurate,
 but rounding devices sizes to chunk sizes.  As the device sizes
 cannot change now, this isn't so important, but it is best to be
 safe.

Without this change:
  mdadm --grow /dev/md0 -z max
  mdadm --grow /dev/md0 -Z max
  then read to the end of the array

can cause a BUG in a RAID0 array.

These bugs have been present ever since it became possible
to resize any device, which is a long time.  So the fix is
suitable for any -stable kerenl.

Cc: stable@vger.kernel.org
Signed-off-by: NeilBrown

md: raid 0 supports TRIM

2012-10-11T02:25:44+00:00

This makes md raid 0 support TRIM.

Signed-off-by: Shaohua Li 
Signed-off-by: NeilBrown

block: Implement support for WRITE SAME

2012-09-20T12:31:45+00:00

The WRITE SAME command supported on some SCSI devices allows the same
block to be efficiently replicated throughout a block range. Only a
single logical block is transferred from the host and the storage device
writes the same data to all blocks described by the I/O.

This patch implements support for WRITE SAME in the block layer. The
blkdev_issue_write_same() function can be used by filesystems and block
drivers to replicate a buffer across a block range. This can be used to
efficiently initialize software RAID devices, etc.

Signed-off-by: Martin K. Petersen 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe

md: Avoid OOPS when reshaping raid1 to raid0

2012-04-03T05:37:26+00:00

raid1 arrays do not have the notion of chunk size. Calculate the
largest chunk sector size we can use to avoid a divide by zero OOPS
when aligning the size of the new array to the chunk size.

Signed-off-by: Jes Sorensen 
Signed-off-by: NeilBrown

md/raid0: If md_integrity_register() fails, raid0_run() must free the mem.

2012-04-01T23:48:37+00:00

Signed-off-by: majianpeng 
Signed-off-by: NeilBrown

md: add proper merge_bvec handling to RAID0 and Linear.

2012-03-19T01:46:39+00:00

These personalities currently set a max request size of one page
when any member device has a merge_bvec_fn because they don't
bother to call that function.

This causes extra works in splitting and combining requests.

So make the extra effort to call the merge_bvec_fn when it exists
so that we end up with larger requests out the bottom.

Signed-off-by: NeilBrown