* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see [sun.com URL with a
- * copy of GPLv2].
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
CERROR("OBD_MD_LINKNAME not set on reply\n");
GOTO(failed, rc = -EPROTO);
}
-
+
LASSERT(symlen != 0);
if (body->eadatasize != symlen) {
CERROR("inode %lu: symlink length %d not expected %d\n",
static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
struct ptlrpc_request *request;
char *symname;
int rc;
CDEBUG(D_VFSTRACE, "VFS Op\n");
/* on symlinks lli_open_sem protects lli_symlink_name allocation/data */
- down(&lli->lli_size_sem);
+ ll_inode_size_lock(inode, 0);
rc = ll_readlink_internal(inode, &request, &symname);
if (rc)
GOTO(out, rc);
rc = vfs_readlink(dentry, buffer, buflen, symname);
ptlrpc_req_finished(request);
out:
- up(&lli->lli_size_sem);
+ ll_inode_size_unlock(inode, 0);
RETURN(rc);
}
struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
#ifdef HAVE_VFS_INTENT_PATCHES
struct lookup_intent *it = ll_nd2it(nd);
#endif
- struct ptlrpc_request *request;
+ struct ptlrpc_request *request = NULL;
int rc;
char *symname;
ENTRY;
#endif
CDEBUG(D_VFSTRACE, "VFS Op\n");
- down(&lli->lli_size_sem);
- rc = ll_readlink_internal(inode, &request, &symname);
- up(&lli->lli_size_sem);
+ /* Limit the recursive symlink depth to 5 instead of default
+ * 8 links when kernel has 4k stack to prevent stack overflow. */
+ if (THREAD_SIZE < 8192 && current->link_count >= 5) {
+ rc = -ELOOP;
+ } else {
+ ll_inode_size_lock(inode, 0);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ ll_inode_size_unlock(inode, 0);
+ }
if (rc) {
path_release(nd); /* Kernel assumes that ->follow_link()
releases nameidata on error */