LU-2675 lustre: remove lustre/include/linux/

[fs/lustre-release.git] / lustre / include / lvfs.h

diff --git a/lustre/include/lvfs.h b/lustre/include/lvfs.h
index 41a7c14..be4187f 100644 (file)
--- a/lustre/include/lvfs.h
+++ b/lustre/include/lvfs.h
@@ -41,12 +41,66 @@
 #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>
 
-#include <linux/lvfs.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
+};
+
+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;
+
+       mutex_lock(&dparent->d_inode->i_mutex);
+       dchild = lookup_one_len(fid_name, dparent, fid_namelen);
+       mutex_unlock(&dparent->d_inode->i_mutex);
+
+       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