linux-toradex.git/drivers/md, branch v3.3.5

md/raid5: Fix a bug about judging if the operation is syncing or replacing

2012-05-07T15:53:36+00:00

commit c6d2e084c7411f61f2b446d94989e5aaf9879b0f upstream.

When create a raid5 using assume-clean and echo check or repair to
sync_action.Then component disks did not operated IO but the raid
check/resync faster than normal.
Because the judgement in function analyse_stripe():
		if (do_recovery ||
		    sh->sector >= conf->mddev->recovery_cp)
			s->syncing = 1;
		else
			s->replacing = 1;
When check or repair,the recovery_cp == MaxSectore,so syncing equal zero
not one.

This bug was introduced by commit 9a3e1101b827
    md/raid5:  detect and handle replacements during recovery.
so this patch is suitable for 3.3-stable.

Signed-off-by: majianpeng 
Signed-off-by: NeilBrown 
Cc: Jes Sorensen 
Signed-off-by: Greg Kroah-Hartman

md: fix possible corruption of array metadata on shutdown.

2012-04-27T17:16:49+00:00

commit 30b8aa9172dfeaac6d77897c67ee9f9fc574cdbb upstream.

commit c744a65c1e2d59acc54333ce8
  md: don't set md arrays to readonly on shutdown.

removed the possibility of a 'BUG' when data is written to an array
that has just been switched to read-only, but also introduced the
possibility that the array metadata could be corrupted.

If, when md_notify_reboot gets the mddev lock, the array is
in a state where it is assembled but hasn't been started (as can
happen if the personality module is not available, or in other unusual
situations), then incorrect metadata will be written out making it
impossible to re-assemble the array.

So only call __md_stop_writes() if the array has actually been
activated.

This patch is needed for any stable kernel which has had the above
commit applied.

Reported-by: Christoph Nelles 
Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

md: don't call ->add_disk unless there is good reason.

2012-04-27T17:16:49+00:00

commit ed209584c38fb74b7eecc03e5b1bfe674e591bd8 upstream.

Commit 7bfec5f35c68121e7b18

   md/raid5: If there is a spare and a want_replacement device, start replacement.

cause md_check_recovery to call ->add_disk much more often.
Instead of only when the array is degraded, it is now called whenever
md_check_recovery finds anything useful to do, which includes
updating the metadata for clean<->dirty transition.
This causes unnecessary work, and causes info messages from ->add_disk
to be reported much too often.

So refine md_check_recovery to only do any actual recovery checking
(including ->add_disk) if MD_RECOVERY_NEEDED is set.

This fix is suitable for 3.3.y:

Reported-by: Jan Ceuleers 
Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

md/bitmap: prevent bitmap_daemon_work running while initialising bitmap

2012-04-22T22:38:55+00:00

commit afbaa90b80b1ec66e5137cc3824746bfdf559b18 upstream.

If a bitmap is added while the array is active, it is possible
for bitmap_daemon_work to run while the bitmap is being
initialised.
This is particularly a problem if bitmap_daemon_work sees
bitmap->filemap as non-NULL before it has been filled in properly.
So hold bitmap_info.mutex while filling in ->filemap
to prevent problems.

This patch is suitable for any -stable kernel, though it might not
apply cleanly before about 3.1.

Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

md/raid1,raid10: Fix calculation of 'vcnt' when processing error recovery.

2012-04-22T22:38:55+00:00

commit f4380a915823dbed0bf8e3cf502ebcf2b7c7f833 upstream.

If r1bio->sectors % 8 != 0,then the memcmp and a later
memcpy will omit the last bio_vec.

This is suitable for any stable kernel since 3.1 when bad-block
management was introduced.

Signed-off-by: majianpeng 
Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

dm thin: fix stacked bi_next usage

2012-04-02T17:32:21+00:00

commit 6f94a4c45a6f744383f9f695dde019998db3df55 upstream.

Avoid using the bi_next field for the holder of a cell when deferring
bios because a stacked device below might change it.  Store the
holder in a new field in struct cell instead.

When a cell is created, the bio that triggered creation (the holder) was
added to the same bio list as subsequent bios.  In some cases we pass
this holder bio directly to devices underneath.  If those devices use
the bi_next field there will be trouble...

This also simplifies some code that had to work out which bio was the
holder.

Signed-off-by: Joe Thornber 
Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Greg Kroah-Hartman

dm persistent data: fix btree rebalancing after remove

2012-04-02T17:32:21+00:00

commit b0988900bae9ecf968a8a8d086a9eec671a9517a upstream.

When we remove an entry from a node we sometimes rebalance with it's
two neighbours.  This wasn't being done correctly; in some cases
entries have to move all the way from the right neighbour to the left
neighbour, or vice versa.  This patch pretty much re-writes the
balancing code to fix it.

This code is barely used currently; only when you delete a thin
device, and then only if you have hundreds of them in the same pool.
Once we have discard support, which removes mappings, this will be used
much more heavily.

Signed-off-by: Joe Thornber 
Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Greg Kroah-Hartman

dm exception store: fix init error path

2012-04-02T17:32:21+00:00

commit aadbe266f2f89ccc68b52f4effc7b3a8b29521ef upstream.

Call the correct exit function on failure in dm_exception_store_init.

Signed-off-by: Andrei Warkentin 
Acked-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Greg Kroah-Hartman

dm crypt: add missing error handling

2012-04-02T17:32:21+00:00

commit 72c6e7afc43e19f68a31dea204fc366624d6eee9 upstream.

Always set io->error to -EIO when an error is detected in dm-crypt.

There were cases where an error code would be set only if we finish
processing the last sector. If there were other encryption operations in
flight, the error would be ignored and bio would be returned with
success as if no error happened.

This bug is present in kcryptd_crypt_write_convert, kcryptd_crypt_read_convert
and kcryptd_async_done.

Signed-off-by: Mikulas Patocka 
Reviewed-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Greg Kroah-Hartman

dm crypt: fix mempool deadlock

2012-04-02T17:32:21+00:00

commit aeb2deae2660a1773c83d3c6e9e6575daa3855d6 upstream.

This patch fixes a possible deadlock in dm-crypt's mempool use.

Currently, dm-crypt reserves a mempool of MIN_BIO_PAGES reserved pages.
It allocates first MIN_BIO_PAGES with non-failing allocation (the allocation
cannot fail and waits until the mempool is refilled). Further pages are
allocated with different gfp flags that allow failing.

Because allocations may be done in parallel, this code can deadlock. Example:
There are two processes, each tries to allocate MIN_BIO_PAGES and the processes
run simultaneously.
It may end up in a situation where each process allocates (MIN_BIO_PAGES / 2)
pages. The mempool is exhausted. Each process waits for more pages to be freed
to the mempool, which never happens.

To avoid this deadlock scenario, this patch changes the code so that only
the first page is allocated with non-failing gfp mask. Allocation of further
pages may fail.

Signed-off-by: Mikulas Patocka 
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Greg Kroah-Hartman