[PATCH] v9fs: VFS file, dentry, and directory operations
This part of the patch contains the VFS file, dentry & directory interfaces.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
new file mode 100644
index 0000000..c478a73
--- /dev/null
+++ b/fs/9p/vfs_dir.c
@@ -0,0 +1,226 @@
+/*
+ * linux/fs/9p/vfs_dir.c
+ *
+ * This file contains vfs directory ops for the 9P2000 protocol.
+ *
+ * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to:
+ * Free Software Foundation
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA 02111-1301 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "conv.h"
+#include "fid.h"
+
+/**
+ * dt_type - return file type
+ * @mistat: mistat structure
+ *
+ */
+
+static inline int dt_type(struct v9fs_stat *mistat)
+{
+ unsigned long perm = mistat->mode;
+ int rettype = DT_REG;
+
+ if (perm & V9FS_DMDIR)
+ rettype = DT_DIR;
+ if (perm & V9FS_DMSYMLINK)
+ rettype = DT_LNK;
+
+ return rettype;
+}
+
+/**
+ * v9fs_dir_readdir - read a directory
+ * @filep: 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)
+{
+ struct v9fs_fcall *fcall = NULL;
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
+ struct v9fs_fid *file = filp->private_data;
+ unsigned int i, n;
+ int fid = -1;
+ int ret = 0;
+ struct v9fs_stat *mi = NULL;
+ int over = 0;
+
+ dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
+
+ fid = file->fid;
+
+ mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
+ if (!mi)
+ return -ENOMEM;
+
+ if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
+ kfree(file->rdir_fcall);
+ file->rdir_fcall = NULL;
+ }
+
+ if (file->rdir_fcall) {
+ n = file->rdir_fcall->params.rread.count;
+ i = file->rdir_fpos;
+ while (i < n) {
+ int s = v9fs_deserialize_stat(v9ses,
+ file->rdir_fcall->params.rread.data + i,
+ n - i, mi, v9ses->maxdata);
+
+ if (s == 0) {
+ dprintk(DEBUG_ERROR,
+ "error while deserializing mistat\n");
+ ret = -EIO;
+ goto FreeStructs;
+ }
+
+ over = filldir(dirent, mi->name, strlen(mi->name),
+ filp->f_pos, v9fs_qid2ino(&mi->qid),
+ dt_type(mi));
+
+ if (over) {
+ file->rdir_fpos = i;
+ file->rdir_pos = filp->f_pos;
+ break;
+ }
+
+ i += s;
+ filp->f_pos += s;
+ }
+
+ if (!over) {
+ kfree(file->rdir_fcall);
+ file->rdir_fcall = NULL;
+ }
+ }
+
+ while (!over) {
+ ret = v9fs_t_read(v9ses, fid, filp->f_pos,
+ v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
+ if (ret < 0) {
+ dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
+ ret, fcall);
+ goto FreeStructs;
+ } else if (ret == 0)
+ break;
+
+ n = ret;
+ i = 0;
+ while (i < n) {
+ int s = v9fs_deserialize_stat(v9ses,
+ fcall->params.rread.data + i, n - i, mi,
+ v9ses->maxdata);
+
+ if (s == 0) {
+ dprintk(DEBUG_ERROR,
+ "error while deserializing mistat\n");
+ return -EIO;
+ }
+
+ over = filldir(dirent, mi->name, strlen(mi->name),
+ filp->f_pos, v9fs_qid2ino(&mi->qid),
+ dt_type(mi));
+
+ if (over) {
+ file->rdir_fcall = fcall;
+ file->rdir_fpos = i;
+ file->rdir_pos = filp->f_pos;
+ fcall = NULL;
+ break;
+ }
+
+ i += s;
+ filp->f_pos += s;
+ }
+
+ kfree(fcall);
+ }
+
+ FreeStructs:
+ kfree(fcall);
+ kfree(mi);
+ return ret;
+}
+
+/**
+ * v9fs_dir_release - close a directory
+ * @inode: inode of the directory
+ * @filp: file pointer to a directory
+ *
+ */
+
+int v9fs_dir_release(struct inode *inode, struct file *filp)
+{
+ struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
+ struct v9fs_fid *fid = filp->private_data;
+ int fidnum = -1;
+
+ dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
+ fid->fid);
+ fidnum = fid->fid;
+
+ filemap_fdatawrite(inode->i_mapping);
+ filemap_fdatawait(inode->i_mapping);
+
+ if (fidnum >= 0) {
+ fid->fidopen--;
+ dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
+ fid->fid);
+
+ if (fid->fidopen == 0) {
+ if (v9fs_t_clunk(v9ses, fidnum, NULL))
+ dprintk(DEBUG_ERROR, "clunk failed\n");
+
+ v9fs_put_idpool(fid->fid, &v9ses->fidpool);
+ }
+
+ kfree(fid->rdir_fcall);
+
+ filp->private_data = NULL;
+ v9fs_fid_destroy(fid);
+ }
+
+ d_drop(filp->f_dentry);
+ return 0;
+}
+
+struct file_operations v9fs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = v9fs_dir_readdir,
+ .open = v9fs_file_open,
+ .release = v9fs_dir_release,
+};