[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>

1 files changed, 226 insertions, 0 deletions

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
new file mode 100644
index 000000000000..c478a7384186
--- /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,
+};