Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/vfs_dir.c |
| 3 | * |
| 4 | * This file contains vfs directory ops for the 9P2000 protocol. |
| 5 | * |
| 6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
Eric Van Hensbergen | 42e8c50 | 2006-03-25 03:07:28 -0800 | [diff] [blame] | 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to: |
| 20 | * Free Software Foundation |
| 21 | * 51 Franklin Street, Fifth Floor |
| 22 | * Boston, MA 02111-1301 USA |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/file.h> |
| 30 | #include <linux/stat.h> |
| 31 | #include <linux/string.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 32 | #include <linux/sched.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 33 | #include <linux/inet.h> |
| 34 | #include <linux/idr.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 35 | #include <net/9p/9p.h> |
| 36 | #include <net/9p/client.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 37 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 38 | #include "v9fs.h" |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 39 | #include "v9fs_vfs.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 40 | #include "fid.h" |
| 41 | |
| 42 | /** |
| 43 | * dt_type - return file type |
| 44 | * @mistat: mistat structure |
| 45 | * |
| 46 | */ |
| 47 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 48 | static inline int dt_type(struct p9_stat *mistat) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 49 | { |
| 50 | unsigned long perm = mistat->mode; |
| 51 | int rettype = DT_REG; |
| 52 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 53 | if (perm & P9_DMDIR) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 54 | rettype = DT_DIR; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 55 | if (perm & P9_DMSYMLINK) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 56 | rettype = DT_LNK; |
| 57 | |
| 58 | return rettype; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * v9fs_dir_readdir - read a directory |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 63 | * @filp: opened file structure |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 64 | * @dirent: directory structure ??? |
| 65 | * @filldir: function to populate directory structure ??? |
| 66 | * |
| 67 | */ |
| 68 | |
| 69 | static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 70 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 71 | int over; |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 72 | struct p9_stat st; |
| 73 | int err; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 74 | struct p9_fid *fid; |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 75 | int buflen; |
| 76 | char *statbuf; |
| 77 | int n, i = 0; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 78 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 79 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 80 | fid = filp->private_data; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 81 | |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 82 | buflen = fid->clnt->msize - P9_IOHDRSZ; |
| 83 | statbuf = kmalloc(buflen, GFP_KERNEL); |
| 84 | if (!statbuf) |
| 85 | return -ENOMEM; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 86 | |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 87 | while (1) { |
Eric Van Hensbergen | 51a87c5 | 2008-10-16 08:30:07 -0500 | [diff] [blame^] | 88 | err = v9fs_file_readn(filp, statbuf, NULL, buflen, |
| 89 | fid->rdir_fpos); |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 90 | if (err <= 0) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 91 | break; |
| 92 | |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 93 | n = err; |
| 94 | while (i < n) { |
| 95 | err = p9_deserialize_stat(statbuf + i, buflen-i, &st, |
| 96 | fid->clnt->dotu); |
| 97 | if (!err) { |
| 98 | err = -EIO; |
| 99 | goto free_and_exit; |
| 100 | } |
| 101 | |
| 102 | i += err; |
| 103 | fid->rdir_fpos += err; |
| 104 | |
| 105 | over = filldir(dirent, st.name.str, st.name.len, |
| 106 | filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st)); |
| 107 | |
| 108 | filp->f_pos += st.size; |
| 109 | |
| 110 | if (over) { |
| 111 | err = 0; |
| 112 | goto free_and_exit; |
| 113 | } |
| 114 | } |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 115 | } |
| 116 | |
Eric Van Hensbergen | 06b55b4 | 2008-10-13 20:36:15 -0500 | [diff] [blame] | 117 | free_and_exit: |
| 118 | kfree(statbuf); |
| 119 | return err; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 122 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 123 | /** |
| 124 | * v9fs_dir_release - close a directory |
| 125 | * @inode: inode of the directory |
| 126 | * @filp: file pointer to a directory |
| 127 | * |
| 128 | */ |
| 129 | |
| 130 | int v9fs_dir_release(struct inode *inode, struct file *filp) |
| 131 | { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 132 | struct p9_fid *fid; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 133 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 134 | fid = filp->private_data; |
| 135 | P9_DPRINTK(P9_DEBUG_VFS, |
| 136 | "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid); |
OGAWA Hirofumi | 28fd129 | 2006-01-08 01:02:14 -0800 | [diff] [blame] | 137 | filemap_write_and_wait(inode->i_mapping); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 138 | p9_client_clunk(fid); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 139 | return 0; |
| 140 | } |
| 141 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 142 | const struct file_operations v9fs_dir_operations = { |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 143 | .read = generic_read_dir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 144 | .llseek = generic_file_llseek, |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 145 | .readdir = v9fs_dir_readdir, |
| 146 | .open = v9fs_file_open, |
| 147 | .release = v9fs_dir_release, |
| 148 | }; |