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  1. 04 Jun, 2009 4 commits
    • Jan Kara's avatar
      ocfs2: Fix possible deadlock in quota recovery · 80d73f15
      Jan Kara authored 
      In ocfs2_finish_quota_recovery() we acquired global quota file lock and started
recovering local quota file. During this process we need to get quota
structures, which calls ocfs2_dquot_acquire() which gets global quota file lock
again. This second lock can block in case some other node has requested the
quota file lock in the mean time. Fix the problem by moving quota file locking
down into the function where it is really needed.  Then dqget() or dqput()
won't be called with the lock held.
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      80d73f15
    • Jan Kara's avatar
      ocfs2: Fix possible deadlock with quotas in ocfs2_setattr() · 65bac575
      Jan Kara authored 
      We called vfs_dq_transfer() with global quota file lock held. This can lead
to deadlocks as if vfs_dq_transfer() has to allocate new quota structure,
it calls ocfs2_dquot_acquire() which tries to get quota file lock again and
this can block if another node requested the lock in the mean time.

Since we have to call vfs_dq_transfer() with transaction already started
and quota file lock ranks above the transaction start, we cannot just rely
on ocfs2_dquot_acquire() or ocfs2_dquot_release() on getting the lock
if they need it. We fix the problem by acquiring pointers to all quota
structures needed by vfs_dq_transfer() already before calling the function.
By this we are sure that all quota structures are properly allocated and
they can be freed only after we drop references to them. Thus we don't need
quota file lock anywhere inside vfs_dq_transfer().
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      65bac575
    • Jan Kara's avatar
      ocfs2: Fix lock inversion in ocfs2_local_read_info() · b4c30de3
      Jan Kara authored 
      This function is called with dqio_mutex held but it has to acquire lock
from global quota file which ranks above this lock. This is not deadlockable
lock inversion since this code path is take only during mount when noone
else can race with us but let's clean this up to silence lockdep.

We just drop the dqio_mutex in the beginning of the function and reacquire
it in the end since we don't need it - noone can race with us at this moment.
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      b4c30de3
    • Jan Kara's avatar
      ocfs2: Fix possible deadlock in ocfs2_global_read_dquot() · 4e8a3019
      Jan Kara authored 
      It is not possible to get a read lock and then try to get the same write lock
in one thread as that can block on downconvert being requested by other node
leading to deadlock. So first drop the quota lock for reading and only after
that get it for writing.
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      4e8a3019
  3. 05 May, 2009 2 commits
    • Coly Li's avatar
      ocfs2: update comments in masklog.h · 2b53bc7b
      Coly Li authored 
      In the mainline ocfs2 code, the interface for masklog is in files under
/sys/fs/o2cb/masklog, but the comments in fs/ocfs2/cluster/masklog.h
reference the old /proc interface.  They are out of date.

This patch modifies the comments in cluster/masklog.h, which also provides
a bash script example on how to change the log mask bits.
Signed-off-by: default avatarColy Li <coly.li@suse.de>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      2b53bc7b
    • Tao Ma's avatar
      ocfs2: Don't printk the error when listing too many xattrs. · a46fa684
      Tao Ma authored 
      Currently the kernel defines XATTR_LIST_MAX as 65536
in include/linux/limits.h.  This is the largest buffer that is used for
listing xattrs.

But with ocfs2 xattr tree, we actually have no limit for the number.  If
filesystem has more names than can fit in the buffer, the kernel
logs will be pollluted with something like this when listing:

(27738,0):ocfs2_iterate_xattr_buckets:3158 ERROR: status = -34
(27738,0):ocfs2_xattr_tree_list_index_block:3264 ERROR: status = -34

So don't print "ERROR" message as this is not an ocfs2 error.
Signed-off-by: default avatarTao Ma <tao.ma@oracle.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
      a46fa684
  5. 02 May, 2009 34 commits
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