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ceph: fix getxattr vxattr handling

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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>
This commit is contained in:
Sage Weil 2013-01-20 22:00:58 -08:00
parent f36e447296
commit 0bee82fb4b
1 changed files with 8 additions and 12 deletions
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20
fs/ceph/xattr.c
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@ -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)