Commit | Line | Data |
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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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bd238fb4 LI |
36 | #include <net/9p/9p.h> |
37 | #include <net/9p/client.h> | |
e69e7fe5 | 38 | |
e69e7fe5 | 39 | #include "v9fs.h" |
531b1094 | 40 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
41 | #include "fid.h" |
42 | ||
3e2796a9 EVH |
43 | /** |
44 | * struct p9_rdir - readdir accounting | |
45 | * @mutex: mutex protecting readdir | |
46 | * @head: start offset of current dirread buffer | |
47 | * @tail: end offset of current dirread buffer | |
48 | * @buf: dirread buffer | |
49 | * | |
50 | * private structure for keeping track of readdir | |
51 | * allocated on demand | |
52 | */ | |
53 | ||
54 | struct p9_rdir { | |
3e2796a9 EVH |
55 | int head; |
56 | int tail; | |
7ffdea7e | 57 | uint8_t buf[]; |
3e2796a9 EVH |
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 | 88 | /** |
7751bdb3 | 89 | * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir |
ee443996 | 90 | * @filp: opened file structure |
7751bdb3 | 91 | * @buflen: Length in bytes of buffer to allocate |
e69e7fe5 EVH |
92 | * |
93 | */ | |
94 | ||
7ffdea7e | 95 | static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen) |
e69e7fe5 | 96 | { |
7ffdea7e AV |
97 | struct p9_fid *fid = filp->private_data; |
98 | if (!fid->rdir) | |
99 | fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL); | |
100 | return fid->rdir; | |
7751bdb3 SK |
101 | } |
102 | ||
103 | /** | |
8f29843a AV |
104 | * v9fs_dir_readdir - iterate through a directory |
105 | * @file: opened file structure | |
106 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
107 | * |
108 | */ | |
109 | ||
8f29843a | 110 | static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx) |
7751bdb3 | 111 | { |
8f29843a | 112 | bool over; |
7751bdb3 SK |
113 | struct p9_wstat st; |
114 | int err = 0; | |
115 | struct p9_fid *fid; | |
116 | int buflen; | |
117 | int reclen = 0; | |
118 | struct p9_rdir *rdir; | |
119 | ||
8f29843a AV |
120 | p9_debug(P9_DEBUG_VFS, "name %s\n", file->f_path.dentry->d_name.name); |
121 | fid = file->private_data; | |
7751bdb3 SK |
122 | |
123 | buflen = fid->clnt->msize - P9_IOHDRSZ; | |
124 | ||
8f29843a | 125 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
126 | if (!rdir) |
127 | return -ENOMEM; | |
3e2796a9 | 128 | |
7ffdea7e | 129 | while (1) { |
3e2796a9 | 130 | if (rdir->tail == rdir->head) { |
8f29843a AV |
131 | err = v9fs_file_readn(file, rdir->buf, NULL, |
132 | buflen, ctx->pos); | |
3e2796a9 | 133 | if (err <= 0) |
7ffdea7e | 134 | return err; |
3e2796a9 EVH |
135 | |
136 | rdir->head = 0; | |
137 | rdir->tail = err; | |
138 | } | |
3e2796a9 | 139 | while (rdir->head < rdir->tail) { |
fae4528b | 140 | p9stat_init(&st); |
348b5901 AK |
141 | err = p9stat_read(fid->clnt, rdir->buf + rdir->head, |
142 | rdir->tail - rdir->head, &st); | |
02da398b | 143 | if (err) { |
5d385153 | 144 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
02da398b | 145 | p9stat_free(&st); |
7ffdea7e | 146 | return -EIO; |
06b55b46 | 147 | } |
3e2796a9 | 148 | reclen = st.size+2; |
06b55b46 | 149 | |
8f29843a AV |
150 | over = !dir_emit(ctx, st.name, strlen(st.name), |
151 | v9fs_qid2ino(&st.qid), dt_type(&st)); | |
02da398b | 152 | p9stat_free(&st); |
7ffdea7e AV |
153 | if (over) |
154 | return 0; | |
155 | ||
3e2796a9 | 156 | rdir->head += reclen; |
8f29843a | 157 | ctx->pos += reclen; |
06b55b46 | 158 | } |
e69e7fe5 | 159 | } |
e69e7fe5 EVH |
160 | } |
161 | ||
7751bdb3 | 162 | /** |
8f29843a AV |
163 | * v9fs_dir_readdir_dotl - iterate through a directory |
164 | * @file: opened file structure | |
165 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
166 | * |
167 | */ | |
8f29843a | 168 | static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx) |
7751bdb3 | 169 | { |
7751bdb3 SK |
170 | int err = 0; |
171 | struct p9_fid *fid; | |
172 | int buflen; | |
173 | struct p9_rdir *rdir; | |
174 | struct p9_dirent curdirent; | |
7751bdb3 | 175 | |
8f29843a AV |
176 | p9_debug(P9_DEBUG_VFS, "name %s\n", file->f_path.dentry->d_name.name); |
177 | fid = file->private_data; | |
7751bdb3 SK |
178 | |
179 | buflen = fid->clnt->msize - P9_READDIRHDRSZ; | |
180 | ||
8f29843a | 181 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
182 | if (!rdir) |
183 | return -ENOMEM; | |
7751bdb3 | 184 | |
7ffdea7e | 185 | while (1) { |
7751bdb3 SK |
186 | if (rdir->tail == rdir->head) { |
187 | err = p9_client_readdir(fid, rdir->buf, buflen, | |
8f29843a | 188 | ctx->pos); |
7751bdb3 | 189 | if (err <= 0) |
7ffdea7e | 190 | return err; |
7751bdb3 SK |
191 | |
192 | rdir->head = 0; | |
193 | rdir->tail = err; | |
194 | } | |
195 | ||
196 | while (rdir->head < rdir->tail) { | |
197 | ||
348b5901 AK |
198 | err = p9dirent_read(fid->clnt, rdir->buf + rdir->head, |
199 | rdir->tail - rdir->head, | |
200 | &curdirent); | |
7751bdb3 | 201 | if (err < 0) { |
5d385153 | 202 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 203 | return -EIO; |
7751bdb3 SK |
204 | } |
205 | ||
8f29843a AV |
206 | if (!dir_emit(ctx, curdirent.d_name, |
207 | strlen(curdirent.d_name), | |
208 | v9fs_qid2ino(&curdirent.qid), | |
209 | curdirent.d_type)) | |
7ffdea7e | 210 | return 0; |
7751bdb3 | 211 | |
8f29843a | 212 | ctx->pos = curdirent.d_off; |
7751bdb3 SK |
213 | rdir->head += err; |
214 | } | |
215 | } | |
7751bdb3 SK |
216 | } |
217 | ||
bd238fb4 | 218 | |
e69e7fe5 EVH |
219 | /** |
220 | * v9fs_dir_release - close a directory | |
221 | * @inode: inode of the directory | |
222 | * @filp: file pointer to a directory | |
223 | * | |
224 | */ | |
225 | ||
226 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
227 | { | |
bd238fb4 | 228 | struct p9_fid *fid; |
e69e7fe5 | 229 | |
bd238fb4 | 230 | fid = filp->private_data; |
5d385153 JP |
231 | p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", |
232 | inode, filp, fid ? fid->fid : -1); | |
62726a7a | 233 | if (fid) |
234 | p9_client_clunk(fid); | |
e69e7fe5 EVH |
235 | return 0; |
236 | } | |
237 | ||
4b6f5d20 | 238 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 239 | .read = generic_read_dir, |
59af1584 | 240 | .llseek = generic_file_llseek, |
8f29843a | 241 | .iterate = v9fs_dir_readdir, |
e69e7fe5 EVH |
242 | .open = v9fs_file_open, |
243 | .release = v9fs_dir_release, | |
244 | }; | |
9b6533c9 SK |
245 | |
246 | const struct file_operations v9fs_dir_operations_dotl = { | |
247 | .read = generic_read_dir, | |
248 | .llseek = generic_file_llseek, | |
8f29843a | 249 | .iterate = v9fs_dir_readdir_dotl, |
9b6533c9 SK |
250 | .open = v9fs_file_open, |
251 | .release = v9fs_dir_release, | |
b165d601 | 252 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 253 | }; |