From: Tariq Saeed <tariq.x.sa...@oracle.com>
Subject: ocfs2: take inode lock in ocfs2_iop_set/get_acl()
Orabug: 20189959
This bug in mainline code is pointed out by Mark Fasheh. When
ocfs2_iop_set_acl() and ocfs2_iop_get_acl() are entered from VFS layer,
inode lock is not held. This seems to be regression from older kernels.
The patch is to fix that.
Signed-off-by: Tariq Saeed <tariq.x.sa...@oracle.com>
Cc: Mark Fasheh <mfas...@suse.com>
Cc: Joel Becker <jl...@evilplan.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
fs/ocfs2/acl.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff -puN
fs/ocfs2/acl.c~resubmit-ocfs2_iop_set-get_acl-called-from-the-vfs-so-take-inode-lock-v2second-version
fs/ocfs2/acl.c
---
a/fs/ocfs2/acl.c~resubmit-ocfs2_iop_set-get_acl-called-from-the-vfs-so-take-inode-lock-v2second-version
+++ a/fs/ocfs2/acl.c
@@ -284,7 +284,19 @@ int ocfs2_set_acl(handle_t *handle,
int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
- return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
+ struct buffer_head *bh = NULL;
+ int status = 0;
+
+ status = ocfs2_inode_lock(inode, &bh, 1);
+ if (status < 0) {
+ if (status != -ENOENT)
+ mlog_errno(status);
+ return status;
+ }
+ status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
+ ocfs2_inode_unlock(inode, 1);
+ brelse(bh);
+ return status;
}
struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
@@ -292,19 +304,21 @@ struct posix_acl *ocfs2_iop_get_acl(stru
struct ocfs2_super *osb;
struct buffer_head *di_bh = NULL;
struct posix_acl *acl;
- int ret = -EAGAIN;
+ int ret;
osb = OCFS2_SB(inode->i_sb);
if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
return NULL;
-
- ret = ocfs2_read_inode_block(inode, &di_bh);
- if (ret < 0)
+ ret = ocfs2_inode_lock(inode, &di_bh, 0);
+ if (ret < 0) {
+ if (ret != -ENOENT)
+ mlog_errno(ret);
return ERR_PTR(ret);
+ }
acl = ocfs2_get_acl_nolock(inode, type, di_bh);
+ ocfs2_inode_unlock(inode, 0);
brelse(di_bh);
-
return acl;
}
_
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