*
* You should have received a copy of the GNU General Public License
* 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
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2014, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#ifndef __LVFS_H__
#define __LVFS_H__
-#include <libcfs/libcfs.h>
+#include <linux/dcache.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include <linux/namei.h>
+#include <lustre_compat.h>
+
+#define OBD_RUN_CTXT_MAGIC 0xC0FFEEAA
+#define OBD_CTXT_DEBUG /* development-only debugging */
+
+struct dt_device;
+
+struct lvfs_run_ctxt {
+ struct vfsmount *pwdmnt;
+ struct dentry *pwd;
+ mm_segment_t fs;
+ int umask;
+ struct dt_device *dt;
+#ifdef OBD_CTXT_DEBUG
+ unsigned int magic;
+#endif
+};
-#if defined(__linux__)
-#include <linux/lvfs.h>
-#elif defined(__APPLE__)
-#include <darwin/lvfs.h>
-#else
-#error Unsupported operating system.
+static inline void OBD_SET_CTXT_MAGIC(struct lvfs_run_ctxt *ctxt)
+{
+#ifdef OBD_CTXT_DEBUG
+ ctxt->magic = OBD_RUN_CTXT_MAGIC;
#endif
+}
/* ptlrpc_sec_ctx.c */
void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx);
void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx);
+/* We need to hold the inode semaphore over the dcache lookup itself, or we
+ * run the risk of entering the filesystem lookup path concurrently on SMP
+ * systems, and instantiating two inodes for the same entry. We still
+ * protect against concurrent addition/removal races with the DLM locking.
+ */
+static inline struct dentry *
+ll_lookup_one_len(const char *fid_name, struct dentry *dparent,
+ int fid_namelen)
+{
+ struct dentry *dchild;
+
+ inode_lock(dparent->d_inode);
+ dchild = lookup_one_len(fid_name, dparent, fid_namelen);
+ inode_unlock(dparent->d_inode);
+
+ if (IS_ERR(dchild) || dchild->d_inode == NULL)
+ return dchild;
+
+ if (is_bad_inode(dchild->d_inode)) {
+ CERROR("bad inode returned %lu/%u\n",
+ dchild->d_inode->i_ino, dchild->d_inode->i_generation);
+ dput(dchild);
+ dchild = ERR_PTR(-ENOENT);
+ }
+
+ return dchild;
+}
+
#endif