linux-toradex.git/fs/reiserfs/bitmap.c, branch v3.14.15

reiserfs: locking, release lock around quota operations

2013-08-08T21:34:47+00:00

Previous commits released the write lock across quota operations but
missed several places.  In particular, the free operations can also
call into the file system code and take the write lock, causing
deadlocks.

This patch introduces some more helpers and uses them for quota call
sites.  Without this patch applied, reiserfs + quotas runs into deadlocks
under anything more than trivial load.

Signed-off-by: Jeff Mahoney

reiserfs: locking, handle nested locks properly

2013-08-08T21:34:46+00:00

The reiserfs write lock replaced the BKL and uses similar semantics.

Frederic's locking code makes a distinction between when the lock is nested
and when it's being acquired/released, but I don't think that's the right
distinction to make.

The right distinction is between the lock being released at end-of-use and
the lock being released for a schedule. The unlock should return the depth
and the lock should restore it, rather than the other way around as it is now.

This patch implements that and adds a number of places where the lock
should be dropped.

Signed-off-by: Jeff Mahoney

reiserfs: fix deadlocks with quotas

2012-08-14T22:22:57+00:00

The BKL push-down for reiserfs made lock recursion a special case that needs
to be handled explicitly. One of the cases that was unhandled is dropping
the quota during inode eviction. Both reiserfs_evict_inode and
reiserfs_write_dquot take the write lock, but when the journal lock is
taken it only drops one the references. The locking rules are that the journal
lock be acquired before the write lock so leaving the reference open leads
to a ABBA deadlock.

This patch pushes the unlock up before clear_inode and avoids the recursive
locking.

Another ABBA situation can occur when the write lock is dropped while reading
the bitmap buffer while in the quota code. When the lock is reacquired, it
will deadlock against dquot->dq_lock and dqopt->dqio_mutex in the dquot_acquire
path. It's safe to retain the lock across the read and should be cached under
write load.

Signed-off-by: Jeff Mahoney 
Signed-off-by: Jan Kara

move private bits of reiserfs_fs.h to fs/reiserfs/reiserfs.h

2012-03-21T01:29:43+00:00

Signed-off-by: Al Viro

kill pointless includes of reiserfs_fs_{i,sb}.h

2012-03-21T01:29:43+00:00

Signed-off-by: Al Viro

reiserfs: delay reiserfs lock until journal initialization

2012-01-11T00:30:53+00:00

In the mount path, transactions that are made before journal
initialization don't involve the filesystem.  We can delay the reiserfs
lock until we play with the journal.

Signed-off-by: Frederic Weisbecker 
Cc: Al Viro 
Cc: Christoph Hellwig 
Cc: Jeff Mahoney 
Cc: Jan Kara 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

reiserfs: Properly display mount options in /proc/mounts

2012-01-07T04:20:13+00:00

Make reiserfs properly display mount options in /proc/mounts.

CC: reiserfs-devel@vger.kernel.org
Signed-off-by: Jan Kara 
Signed-off-by: Al Viro

reiserfs: use hweight_long()

2011-07-26T03:57:17+00:00

Use hweight_long() to count free bits in the bitmap.

Signed-off-by: Akinobu Mita 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

reiserfs: use proper little-endian bitops

2011-07-26T03:57:17+00:00

Using __test_and_{set,clear}_bit_le() with ignoring its return value can
be replaced with __{set,clear}_bit_le().

This introduces reiserfs_{set,clear}_le_bit for __{set,clear}_bit_le and
does the above change with them.

Signed-off-by: Akinobu Mita 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'for-next' into for-linus

2010-03-08T15:55:37+00:00

Conflicts:
	Documentation/filesystems/proc.txt
	arch/arm/mach-u300/include/mach/debug-macro.S
	drivers/net/qlge/qlge_ethtool.c
	drivers/net/qlge/qlge_main.c
	drivers/net/typhoon.c