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authorJunxiao Bi <junxiao.bi@oracle.com>2016-05-12 15:42:15 -0700
committerSasha Levin <sasha.levin@oracle.com>2016-05-17 13:43:13 -0400
commit533e936848522f8394709b64fba45f657ca26f10 (patch)
treea116bb94fe125b2d472abb9299c5183e18054671
parent2239ca3f89e5dfb1f24e98207318d91e6c2cf0f7 (diff)
downloadlwn-533e936848522f8394709b64fba45f657ca26f10.tar.gz
lwn-533e936848522f8394709b64fba45f657ca26f10.zip
ocfs2: revert using ocfs2_acl_chmod to avoid inode cluster lock hang
[ Upstream commit 5ee0fbd50fdf1c1329de8bee35ea9d7c6a81a2e0 ] 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> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
-rw-r--r--fs/ocfs2/acl.c24
-rw-r--r--fs/ocfs2/acl.h1
-rw-r--r--fs/ocfs2/file.c4
3 files changed, 27 insertions, 2 deletions
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index c58a1bcfda0f..76ed7a66615a 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -308,3 +308,27 @@ struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
return acl;
}
+
+int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct posix_acl *acl;
+ int ret;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
+ return 0;
+
+ acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
+ if (IS_ERR(acl) || !acl)
+ return PTR_ERR(acl);
+ ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+ if (ret)
+ return ret;
+ ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
+ acl, NULL, NULL);
+ posix_acl_release(acl);
+ return ret;
+}
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 */
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index d8b670cbd909..3f1ee404f40f 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1256,18 +1256,18 @@ bail_unlock_rw:
if (size_change)
ocfs2_rw_unlock(inode, 1);
bail:
- brelse(bh);
/* Release quota pointers in case we acquired them */
for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
dqput(transfer_to[qtype]);
if (!status && attr->ia_valid & ATTR_MODE) {
- status = posix_acl_chmod(inode, inode->i_mode);
+ status = ocfs2_acl_chmod(inode, bh);
if (status < 0)
mlog_errno(status);
}
+ brelse(bh);
return status;
}