From 0bee82fb4b8d49541fe474ed460d2b917f329568 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@inktank.com>
Date: Sun, 20 Jan 2013 22:00:58 -0800
Subject: [PATCH] ceph: fix getxattr vxattr handling
Change the vxattr handling for getxattr so that vxattrs are checked
prior to any xattr content, and never after. Enforce vxattr existence
via the exists_cb callback.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Sam Lang <sam.lang@inktank.com>
---
fs/ceph/xattr.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 06344da4e968..87b85f3403d4 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -569,13 +569,17 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
if (!ceph_is_valid_xattr(name))
return -ENODATA;
- /* let's see if a virtual xattr was requested */
- vxattr = ceph_match_vxattr(inode, name);
-
spin_lock(&ci->i_ceph_lock);
dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
+ /* let's see if a virtual xattr was requested */
+ vxattr = ceph_match_vxattr(inode, name);
+ if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
+ err = vxattr->getxattr_cb(ci, value, size);
+ goto out;
+ }
+
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
goto get_xattr;
@@ -589,11 +593,6 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
spin_lock(&ci->i_ceph_lock);
- if (vxattr && vxattr->readonly) {
- err = vxattr->getxattr_cb(ci, value, size);
- goto out;
- }
-
err = __build_xattrs(inode);
if (err < 0)
goto out;
@@ -601,11 +600,8 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
get_xattr:
err = -ENODATA; /* == ENOATTR */
xattr = __get_xattr(ci, name);
- if (!xattr) {
- if (vxattr)
- err = vxattr->getxattr_cb(ci, value, size);
+ if (!xattr)
goto out;
- }
err = -ERANGE;
if (size && size < xattr->val_len)