linux-toradex.git/drivers/md/multipath.c, branch v4.10

Merge branch 'md-next' into md-linus

2016-12-13T20:40:15+00:00

md: separate flags for superblock changes

2016-12-09T06:01:47+00:00

The mddev->flags are used for different purposes. There are a lot of
places we check/change the flags without masking unrelated flags, we
could check/change unrelated flags. These usage are most for superblock
write, so spearate superblock related flags. This should make the code
clearer and also fix real bugs.

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

block: bio: pass bvec table to bio_init()

2016-11-22T15:57:21+00:00

Some drivers often use external bvec table, so introduce
this helper for this case. It is always safe to access the
bio->bi_io_vec in this way for this case.

After converting to this usage, it will becomes a bit easier
to evaluate the remaining direct access to bio->bi_io_vec,
so it can help to prepare for the following multipage bvec
support.

Signed-off-by: Ming Lei 
Reviewed-by: Christoph Hellwig 

Fixed up the new O_DIRECT cases.

Signed-off-by: Jens Axboe

md/multipath: replace printk() with pr_*()

2016-11-07T23:08:22+00:00

Also remove all messages about memory allocation failure.
page_alloc() reports those.

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

block: rename bio bi_rw to bi_opf

2016-08-07T20:41:02+00:00

Since commit 63a4cc24867d, bio->bi_rw contains flags in the lower
portion and the op code in the higher portions. This means that
old code that relies on manually setting bi_rw is most likely
going to be broken. Instead of letting that brokeness linger,
rename the member, to force old and out-of-tree code to break
at compile time instead of at runtime.

No intended functional changes in this commit.

Signed-off-by: Jens Axboe

Merge branch 'mymd/for-next' into mymd/for-linus

2016-07-28T16:34:14+00:00

md: reduce the number of synchronize_rcu() calls when multiple devices fail.

2016-06-13T18:54:22+00:00

Every time a device is removed with ->hot_remove_disk() a synchronize_rcu() call is made
which can delay several milliseconds in some case.
If lots of devices fail at once - as could happen with a large RAID10 where one set
of devices are removed all at once - these delays can add up to be very inconcenient.

As failure is not reversible we can check for that first, setting a
separate flag if it is found, and then all synchronize_rcu() once for
all the flagged devices.  Then ->hot_remove_disk() function can skip the
synchronize_rcu() step if the flag is set.

fix build error(Shaohua)
Signed-off-by: NeilBrown 
Signed-off-by: Shaohua Li

md: be extra careful not to take a reference to a Faulty device.

2016-06-13T18:54:21+00:00

It is important that we never increment rdev->nr_pending on a Faulty
device as ->hot_remove_disk() assumes that once the Faulty flag is visible
no code will take a new reference.

Some places take a new reference after only check In_sync.  This should
be safe as the two are changed together.  However to make the code more
obviously safe, add checks for 'Faulty' as well.

Note: the actual rule is:
  Never increment nr_pending if  Faulty is set and Blocked is clear,
  never clear Faulty, and never set Blocked without holding a reference
  through nr_pending.

fix build error (Shaohua)
Signed-off-by: NeilBrown 
Signed-off-by: Shaohua Li

md/multipath: add rcu protection to rdev access in multipath_status.

2016-06-13T18:54:21+00:00

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

block, drivers, fs: rename REQ_FLUSH to REQ_PREFLUSH

2016-06-07T19:41:38+00:00

To avoid confusion between REQ_OP_FLUSH, which is handled by
request_fn drivers, and upper layers requesting the block layer
perform a flush sequence along with possibly a WRITE, this patch
renames REQ_FLUSH to REQ_PREFLUSH.

Signed-off-by: Mike Christie 
Reviewed-by: Christoph Hellwig 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Jens Axboe