linux-stable.git/drivers/md/raid10.c, branch linux-4.10.y

blk: Ensure users for current->bio_list can see the full list.

2017-04-08T07:35:09+00:00

commit f5fe1b51905df7cfe4fdfd85c5fb7bc5b71a094f upstream.

Commit 79bd99596b73 ("blk: improve order of bio handling in generic_make_request()")
changed current->bio_list so that it did not contain *all* of the
queued bios, but only those submitted by the currently running
make_request_fn.

There are two places which walk the list and requeue selected bios,
and others that check if the list is empty.  These are no longer
correct.

So redefine current->bio_list to point to an array of two lists, which
contain all queued bios, and adjust various code to test or walk both
lists.

Signed-off-by: NeilBrown 
Fixes: 79bd99596b73 ("blk: improve order of bio handling in generic_make_request()")
Signed-off-by: Jens Axboe 
Cc: Jack Wang 
Signed-off-by: Greg Kroah-Hartman

md/raid1/10: fix potential deadlock

2017-03-26T11:08:11+00:00

commit 61eb2b43b99ebdc9bc6bc83d9792257b243e7cb3 upstream.

Neil Brown pointed out a potential deadlock in raid 10 code with
bio_split/chain. The raid1 code could have the same issue, but recent
barrier rework makes it less likely to happen. The deadlock happens in
below sequence:

1. generic_make_request(bio), this will set current->bio_list
2. raid10_make_request will split bio to bio1 and bio2
3. __make_request(bio1), wait_barrer, add underlayer disk bio to
current->bio_list
4. __make_request(bio2), wait_barrer

If raise_barrier happens between 3 & 4, since wait_barrier runs at 3,
raise_barrier waits for IO completion from 3. And since raise_barrier
sets barrier, 4 waits for raise_barrier. But IO from 3 can't be
dispatched because raid10_make_request() doesn't finished yet.

The solution is to adjust the IO ordering. Quotes from Neil:
"
It is much safer to:

    if (need to split) {
        split = bio_split(bio, ...)
        bio_chain(...)
        make_request_fn(split);
        generic_make_request(bio);
   } else
        make_request_fn(mddev, bio);

This way we first process the initial section of the bio (in 'split')
which will queue some requests to the underlying devices.  These
requests will be queued in generic_make_request.
Then we queue the remainder of the bio, which will be added to the end
of the generic_make_request queue.
Then we return.
generic_make_request() will pop the lower-level device requests off the
queue and handle them first.  Then it will process the remainder
of the original bio once the first section has been fully processed.
"

Note, this only happens in read path. In write path, the bio is flushed to
underlaying disks either by blk flush (from schedule) or offladed to raid1/10d.
It's queued in current->bio_list.

Cc: Coly Li 
Suggested-by: NeilBrown 
Reviewed-by: Jack Wang 
Signed-off-by: Shaohua Li 
Signed-off-by: Greg Kroah-Hartman

md/raid10: Refactor raid10_make_request

2017-01-03T16:56:52+00:00

Refactor raid10_make_request into seperate read and write functions to
clean up the code.

Shaohua: add the recovery check back to read path

Signed-off-by: Robert LeBlanc 
Signed-off-by: Shaohua Li

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

md/raid10: add failfast handling for writes.

2016-11-22T17:14:42+00:00

When writing to a fastfail device, we use MD_FASTFAIL unless
it is the only device being written to.  For
resync/recovery, assume there was a working device to read
from so always use MD_FASTFAIL.

If a write for resync/recovery fails, we just fail the
device - there is not much else to do.

If a normal write fails, but the device cannot be marked
Faulty (must be only one left), we queue for write error
handling which calls narrow_write_error() to write the block
synchronously without any failfast flags.

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

md/raid10: add failfast handling for reads.

2016-11-22T17:14:28+00:00

If a device is marked FailFast, and it is not the only
device we can read from, we mark the bio as MD_FAILFAST.

If this does fail-fast, we don't try read repair but just
allow failure.

If it was the last device, it doesn't get marked Faulty so
the retry happens on the same device - this time without
FAILFAST.  A subsequent failure will not retry but will just
pass up the error.

During resync we may use FAILFAST requests, and on a failure
we will simply use the other device(s).

During recovery we will only use FAILFAST in the unusual
case were there are multiple places to read from - i.e. if
there are > 2 devices.  If we get a failure we will fail the
device and complete the resync/recovery with remaining
devices.

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

md: Use REQ_FAILFAST_* on metadata writes where appropriate

2016-11-22T17:11:33+00:00

This can only be supported on personalities which ensure
that md_error() never causes an array to enter the 'failed'
state.  i.e. if marking a device Faulty would cause some
data to be inaccessible, the device is status is left as
non-Faulty.  This is true for RAID1 and RAID10.

If we get a failure writing metadata but the device doesn't
fail, it must be the last device so we re-write without
FAILFAST to improve chance of success.  We also flag the
device as LastDev so that future metadata updates don't
waste time on failfast writes.

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

md/raid1, raid10: add blktrace records when IO is delayed

2016-11-18T17:35:37+00:00

Both raid1 and raid10 will sometimes delay handling an IO request,
such as when resync is happening or there are too many requests queued.

Add some blktrace messsages so we can see when that is happening when
looking for performance artefacts.

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

md: add block tracing for bio_remapping

2016-11-18T17:32:50+00:00

The block tracing infrastructure (accessed with blktrace/blkparse)
supports the tracing of mapping bios from one device to another.
This is currently used when a bio in a partition is mapped to the
whole device, when bios are mapped by dm, and for mapping in md/raid5.
Other md personalities do not include this tracing yet, so add it.

When a read-error is detected we redirect the request to a different device.
This could justifiably be seen as a new mapping for the originial bio,
or a secondary mapping for the bio that errors.  This patch uses
the second option.

When md is used under dm-raid, the mappings are not traced as we do
not have access to the block device number of the parent.

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

md/raid10: abort delayed writes when device fails.

2016-11-07T23:08:23+00:00

When writing to an array with a bitmap enabled, the writes are grouped
in batches which are preceded by an update to the bitmap.

It is quite likely if that a drive develops a problem which is not
media related, that the bitmap write will be the first to report an
error and cause the device to be marked faulty (as the bitmap write is
at the start of a batch).

In this case, there is point submiting the subsequent writes to the
failed device - that just wastes times.

So re-check the Faulty state of a device before submitting a
delayed write.

This requires that we keep the 'rdev', rather than the 'bdev' in the
bio, then swap in the bdev just before final submission.

Reported-by: Hannes Reinecke 
Signed-off-by: NeilBrown 
Signed-off-by: Shaohua Li