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| author | Junxiao Bi <junxiao.bi@oracle.com> | 2016-05-13 01:42:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-13 01:52:50 +0300 |
| commit | c25a1e0671fbca7b2c0d0757d533bd2650d6dc0c (patch) | |
| tree | 568387253124f7f9aa738aea26f7964d048aa70b /fs/ocfs2/acl.h | |
| parent | 5ee0fbd50fdf1c1329de8bee35ea9d7c6a81a2e0 (diff) | |
| download | linux-c25a1e0671fbca7b2c0d0757d533bd2650d6dc0c.tar.xz | |
ocfs2: fix posix_acl_create deadlock
Commit 702e5bc68ad2 ("ocfs2: use generic posix ACL infrastructure")
refactored code to use posix_acl_create. The problem with this function
is that it is not mindful of the cluster wide inode lock making it
unsuitable for use with ocfs2 inode creation with ACLs. For example,
when used in ocfs2_mknod, this function can cause deadlock as follows.
The parent dir inode lock is taken when calling posix_acl_create ->
get_acl -> ocfs2_iop_get_acl which takes the inode lock again. This can
cause deadlock if there is a blocked remote lock request waiting for the
lock to be downconverted. And same deadlock happened in ocfs2_reflink.
This fix is to revert back using ocfs2_init_acl.
Fixes: 702e5bc68ad2 ("ocfs2: use generic posix ACL infrastructure")
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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/acl.h')
| -rw-r--r-- | fs/ocfs2/acl.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h index 035e5878db06..2783a75b3999 100644 --- a/fs/ocfs2/acl.h +++ b/fs/ocfs2/acl.h @@ -36,5 +36,9 @@ int ocfs2_set_acl(handle_t *handle, struct ocfs2_alloc_context *meta_ac, struct ocfs2_alloc_context *data_ac); extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *); +extern int ocfs2_init_acl(handle_t *, struct inode *, struct inode *, + struct buffer_head *, struct buffer_head *, + struct ocfs2_alloc_context *, + struct ocfs2_alloc_context *); #endif /* OCFS2_ACL_H */ |