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| author | Junxiao Bi <junxiao.bi@oracle.com> | 2016-05-12 15:42:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 18:35:08 -0700 |
| commit | 0c4998e34bdd567bca20f857015c595839457a2e (patch) | |
| tree | 9c02232f7ae47a0e21d527f4a44c45effb028d0e /fs/ocfs2/acl.h | |
| parent | 8be13acc8709f013813da8ae36c6f0e538cbcc0f (diff) | |
| download | lwn-0c4998e34bdd567bca20f857015c595839457a2e.tar.gz lwn-0c4998e34bdd567bca20f857015c595839457a2e.zip | |
ocfs2: revert using ocfs2_acl_chmod to avoid inode cluster lock hang
commit 5ee0fbd50fdf1c1329de8bee35ea9d7c6a81a2e0 upstream.
Commit 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()")
introduced this issue. ocfs2_setattr called by chmod command holds
cluster wide inode lock when calling posix_acl_chmod. This latter
function in turn calls ocfs2_iop_get_acl and ocfs2_iop_set_acl. These
two are also called directly from vfs layer for getfacl/setfacl commands
and therefore acquire the cluster wide inode lock. If a remote
conversion request comes after the first inode lock in ocfs2_setattr,
OCFS2_LOCK_BLOCKED will be set. And this will cause the second call to
inode lock from the ocfs2_iop_get_acl() to block indefinetly.
The deleted version of ocfs2_acl_chmod() calls __posix_acl_chmod() which
does not call back into the filesystem. Therefore, we restore
ocfs2_acl_chmod(), modify it slightly for locking as needed, and use that
instead.
Fixes: 743b5f1434f5 ("ocfs2: take inode lock in ocfs2_iop_set/get_acl()")
Signed-off-by: Tariq Saeed <tariq.x.saeed@oracle.com>
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ocfs2/acl.h')
| -rw-r--r-- | fs/ocfs2/acl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h index 3fce68d08625..035e5878db06 100644 --- a/fs/ocfs2/acl.h +++ b/fs/ocfs2/acl.h @@ -35,5 +35,6 @@ int ocfs2_set_acl(handle_t *handle, struct posix_acl *acl, struct ocfs2_alloc_context *meta_ac, struct ocfs2_alloc_context *data_ac); +extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *); #endif /* OCFS2_ACL_H */ |