Commit | Line | Data |
---|---|---|
e69e7fe5 EVH |
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 | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
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> | |
914e2637 | 32 | #include <linux/sched.h> |
e69e7fe5 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/idr.h> | |
bd238fb4 LI |
35 | #include <net/9p/9p.h> |
36 | #include <net/9p/client.h> | |
e69e7fe5 | 37 | |
e69e7fe5 | 38 | #include "v9fs.h" |
531b1094 | 39 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
40 | #include "fid.h" |
41 | ||
3e2796a9 EVH |
42 | /** |
43 | * struct p9_rdir - readdir accounting | |
44 | * @mutex: mutex protecting readdir | |
45 | * @head: start offset of current dirread buffer | |
46 | * @tail: end offset of current dirread buffer | |
47 | * @buf: dirread buffer | |
48 | * | |
49 | * private structure for keeping track of readdir | |
50 | * allocated on demand | |
51 | */ | |
52 | ||
53 | struct p9_rdir { | |
54 | struct mutex mutex; | |
55 | int head; | |
56 | int tail; | |
57 | uint8_t *buf; | |
58 | }; | |
59 | ||
e69e7fe5 EVH |
60 | /** |
61 | * dt_type - return file type | |
62 | * @mistat: mistat structure | |
63 | * | |
64 | */ | |
65 | ||
02da398b | 66 | static inline int dt_type(struct p9_wstat *mistat) |
e69e7fe5 EVH |
67 | { |
68 | unsigned long perm = mistat->mode; | |
69 | int rettype = DT_REG; | |
70 | ||
bd238fb4 | 71 | if (perm & P9_DMDIR) |
e69e7fe5 | 72 | rettype = DT_DIR; |
bd238fb4 | 73 | if (perm & P9_DMSYMLINK) |
e69e7fe5 EVH |
74 | rettype = DT_LNK; |
75 | ||
76 | return rettype; | |
77 | } | |
78 | ||
fae4528b AK |
79 | static void p9stat_init(struct p9_wstat *stbuf) |
80 | { | |
81 | stbuf->name = NULL; | |
82 | stbuf->uid = NULL; | |
83 | stbuf->gid = NULL; | |
84 | stbuf->muid = NULL; | |
85 | stbuf->extension = NULL; | |
86 | } | |
87 | ||
e69e7fe5 EVH |
88 | /** |
89 | * v9fs_dir_readdir - read a directory | |
ee443996 | 90 | * @filp: opened file structure |
e69e7fe5 EVH |
91 | * @dirent: directory structure ??? |
92 | * @filldir: function to populate directory structure ??? | |
93 | * | |
94 | */ | |
95 | ||
96 | static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
97 | { | |
bd238fb4 | 98 | int over; |
02da398b | 99 | struct p9_wstat st; |
3e2796a9 | 100 | int err = 0; |
bd238fb4 | 101 | struct p9_fid *fid; |
06b55b46 | 102 | int buflen; |
3e2796a9 EVH |
103 | int reclen = 0; |
104 | struct p9_rdir *rdir; | |
bd238fb4 LI |
105 | |
106 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); | |
bd238fb4 | 107 | fid = filp->private_data; |
bd238fb4 | 108 | |
06b55b46 | 109 | buflen = fid->clnt->msize - P9_IOHDRSZ; |
3e2796a9 EVH |
110 | |
111 | /* allocate rdir on demand */ | |
112 | if (!fid->rdir) { | |
113 | rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL); | |
114 | ||
115 | if (rdir == NULL) { | |
116 | err = -ENOMEM; | |
117 | goto exit; | |
118 | } | |
119 | spin_lock(&filp->f_dentry->d_lock); | |
120 | if (!fid->rdir) { | |
121 | rdir->buf = (uint8_t *)rdir + sizeof(struct p9_rdir); | |
122 | mutex_init(&rdir->mutex); | |
123 | rdir->head = rdir->tail = 0; | |
124 | fid->rdir = (void *) rdir; | |
125 | rdir = NULL; | |
126 | } | |
127 | spin_unlock(&filp->f_dentry->d_lock); | |
128 | kfree(rdir); | |
129 | } | |
130 | rdir = (struct p9_rdir *) fid->rdir; | |
131 | ||
132 | err = mutex_lock_interruptible(&rdir->mutex); | |
133 | while (err == 0) { | |
134 | if (rdir->tail == rdir->head) { | |
135 | err = v9fs_file_readn(filp, rdir->buf, NULL, | |
136 | buflen, filp->f_pos); | |
137 | if (err <= 0) | |
138 | goto unlock_and_exit; | |
139 | ||
140 | rdir->head = 0; | |
141 | rdir->tail = err; | |
142 | } | |
3e2796a9 | 143 | while (rdir->head < rdir->tail) { |
fae4528b | 144 | p9stat_init(&st); |
3e2796a9 EVH |
145 | err = p9stat_read(rdir->buf + rdir->head, |
146 | buflen - rdir->head, &st, | |
342fee1d | 147 | fid->clnt->proto_version); |
02da398b EVH |
148 | if (err) { |
149 | P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err); | |
06b55b46 | 150 | err = -EIO; |
02da398b | 151 | p9stat_free(&st); |
3e2796a9 | 152 | goto unlock_and_exit; |
06b55b46 | 153 | } |
3e2796a9 | 154 | reclen = st.size+2; |
06b55b46 | 155 | |
02da398b | 156 | over = filldir(dirent, st.name, strlen(st.name), |
06b55b46 EVH |
157 | filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st)); |
158 | ||
02da398b | 159 | p9stat_free(&st); |
06b55b46 EVH |
160 | |
161 | if (over) { | |
162 | err = 0; | |
3e2796a9 | 163 | goto unlock_and_exit; |
06b55b46 | 164 | } |
3e2796a9 EVH |
165 | rdir->head += reclen; |
166 | filp->f_pos += reclen; | |
06b55b46 | 167 | } |
e69e7fe5 EVH |
168 | } |
169 | ||
3e2796a9 EVH |
170 | unlock_and_exit: |
171 | mutex_unlock(&rdir->mutex); | |
172 | exit: | |
06b55b46 | 173 | return err; |
e69e7fe5 EVH |
174 | } |
175 | ||
bd238fb4 | 176 | |
e69e7fe5 EVH |
177 | /** |
178 | * v9fs_dir_release - close a directory | |
179 | * @inode: inode of the directory | |
180 | * @filp: file pointer to a directory | |
181 | * | |
182 | */ | |
183 | ||
184 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
185 | { | |
bd238fb4 | 186 | struct p9_fid *fid; |
e69e7fe5 | 187 | |
bd238fb4 LI |
188 | fid = filp->private_data; |
189 | P9_DPRINTK(P9_DEBUG_VFS, | |
190 | "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid); | |
28fd1298 | 191 | filemap_write_and_wait(inode->i_mapping); |
bd238fb4 | 192 | p9_client_clunk(fid); |
e69e7fe5 EVH |
193 | return 0; |
194 | } | |
195 | ||
4b6f5d20 | 196 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 197 | .read = generic_read_dir, |
59af1584 | 198 | .llseek = generic_file_llseek, |
e69e7fe5 EVH |
199 | .readdir = v9fs_dir_readdir, |
200 | .open = v9fs_file_open, | |
201 | .release = v9fs_dir_release, | |
202 | }; |