btrfs: try harder to allocate raid56 stripe cache
[linux-3.10.git] / fs / 9p / vfs_dir.c
index 36d961f..ff911e7 100644 (file)
@@ -87,29 +87,19 @@ static void p9stat_init(struct p9_wstat *stbuf)
 }
 
 /**
- * v9fs_dir_readdir - read a directory
+ * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir
  * @filp: opened file structure
- * @dirent: directory structure ???
- * @filldir: function to populate directory structure ???
+ * @buflen: Length in bytes of buffer to allocate
  *
  */
 
-static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
+static int v9fs_alloc_rdir_buf(struct file *filp, int buflen)
 {
-       int over;
-       struct p9_wstat st;
-       int err = 0;
-       struct p9_fid *fid;
-       int buflen;
-       int reclen = 0;
        struct p9_rdir *rdir;
+       struct p9_fid *fid;
+       int err = 0;
 
-       P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
        fid = filp->private_data;
-
-       buflen = fid->clnt->msize - P9_IOHDRSZ;
-
-       /* allocate rdir on demand */
        if (!fid->rdir) {
                rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
 
@@ -128,6 +118,36 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
                spin_unlock(&filp->f_dentry->d_lock);
                kfree(rdir);
        }
+exit:
+       return err;
+}
+
+/**
+ * v9fs_dir_readdir - read a directory
+ * @filp: opened file structure
+ * @dirent: directory structure ???
+ * @filldir: function to populate directory structure ???
+ *
+ */
+
+static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+       int over;
+       struct p9_wstat st;
+       int err = 0;
+       struct p9_fid *fid;
+       int buflen;
+       int reclen = 0;
+       struct p9_rdir *rdir;
+
+       p9_debug(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
+       fid = filp->private_data;
+
+       buflen = fid->clnt->msize - P9_IOHDRSZ;
+
+       err = v9fs_alloc_rdir_buf(filp, buflen);
+       if (err)
+               goto exit;
        rdir = (struct p9_rdir *) fid->rdir;
 
        err = mutex_lock_interruptible(&rdir->mutex);
@@ -145,11 +165,10 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
                }
                while (rdir->head < rdir->tail) {
                        p9stat_init(&st);
-                       err = p9stat_read(rdir->buf + rdir->head,
-                                               rdir->tail - rdir->head, &st,
-                                               fid->clnt->proto_version);
+                       err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
+                                         rdir->tail - rdir->head, &st);
                        if (err) {
-                               P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
+                               p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
                                err = -EIO;
                                p9stat_free(&st);
                                goto unlock_and_exit;
@@ -176,6 +195,88 @@ exit:
        return err;
 }
 
+/**
+ * v9fs_dir_readdir_dotl - read a directory
+ * @filp: opened file structure
+ * @dirent: buffer to fill dirent structures
+ * @filldir: function to populate dirent structures
+ *
+ */
+static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
+                                               filldir_t filldir)
+{
+       int over;
+       int err = 0;
+       struct p9_fid *fid;
+       int buflen;
+       struct p9_rdir *rdir;
+       struct p9_dirent curdirent;
+       u64 oldoffset = 0;
+
+       p9_debug(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
+       fid = filp->private_data;
+
+       buflen = fid->clnt->msize - P9_READDIRHDRSZ;
+
+       err = v9fs_alloc_rdir_buf(filp, buflen);
+       if (err)
+               goto exit;
+       rdir = (struct p9_rdir *) fid->rdir;
+
+       err = mutex_lock_interruptible(&rdir->mutex);
+       if (err)
+               return err;
+
+       while (err == 0) {
+               if (rdir->tail == rdir->head) {
+                       err = p9_client_readdir(fid, rdir->buf, buflen,
+                                               filp->f_pos);
+                       if (err <= 0)
+                               goto unlock_and_exit;
+
+                       rdir->head = 0;
+                       rdir->tail = err;
+               }
+
+               while (rdir->head < rdir->tail) {
+
+                       err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
+                                           rdir->tail - rdir->head,
+                                           &curdirent);
+                       if (err < 0) {
+                               p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
+                               err = -EIO;
+                               goto unlock_and_exit;
+                       }
+
+                       /* d_off in dirent structure tracks the offset into
+                        * the next dirent in the dir. However, filldir()
+                        * expects offset into the current dirent. Hence
+                        * while calling filldir send the offset from the
+                        * previous dirent structure.
+                        */
+                       over = filldir(dirent, curdirent.d_name,
+                                       strlen(curdirent.d_name),
+                                       oldoffset, v9fs_qid2ino(&curdirent.qid),
+                                       curdirent.d_type);
+                       oldoffset = curdirent.d_off;
+
+                       if (over) {
+                               err = 0;
+                               goto unlock_and_exit;
+                       }
+
+                       filp->f_pos = curdirent.d_off;
+                       rdir->head += err;
+               }
+       }
+
+unlock_and_exit:
+       mutex_unlock(&rdir->mutex);
+exit:
+       return err;
+}
+
 
 /**
  * v9fs_dir_release - close a directory
@@ -189,10 +290,10 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
        struct p9_fid *fid;
 
        fid = filp->private_data;
-       P9_DPRINTK(P9_DEBUG_VFS,
-                       "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
-       filemap_write_and_wait(inode->i_mapping);
-       p9_client_clunk(fid);
+       p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
+                inode, filp, fid ? fid->fid : -1);
+       if (fid)
+               p9_client_clunk(fid);
        return 0;
 }
 
@@ -207,7 +308,8 @@ const struct file_operations v9fs_dir_operations = {
 const struct file_operations v9fs_dir_operations_dotl = {
        .read = generic_read_dir,
        .llseek = generic_file_llseek,
-       .readdir = v9fs_dir_readdir,
+       .readdir = v9fs_dir_readdir_dotl,
        .open = v9fs_file_open,
        .release = v9fs_dir_release,
+        .fsync = v9fs_file_fsync_dotl,
 };