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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> |
e1200fe6 | 36 | #include <linux/uio.h> |
bd238fb4 LI |
37 | #include <net/9p/9p.h> |
38 | #include <net/9p/client.h> | |
e69e7fe5 | 39 | |
e69e7fe5 | 40 | #include "v9fs.h" |
531b1094 | 41 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
42 | #include "fid.h" |
43 | ||
3e2796a9 EVH |
44 | /** |
45 | * struct p9_rdir - readdir accounting | |
3e2796a9 EVH |
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 | ||
79 | /** | |
7751bdb3 | 80 | * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir |
ee443996 | 81 | * @filp: opened file structure |
7751bdb3 | 82 | * @buflen: Length in bytes of buffer to allocate |
e69e7fe5 EVH |
83 | * |
84 | */ | |
85 | ||
7ffdea7e | 86 | static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen) |
e69e7fe5 | 87 | { |
7ffdea7e AV |
88 | struct p9_fid *fid = filp->private_data; |
89 | if (!fid->rdir) | |
90 | fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL); | |
91 | return fid->rdir; | |
7751bdb3 SK |
92 | } |
93 | ||
94 | /** | |
8f29843a AV |
95 | * v9fs_dir_readdir - iterate through a directory |
96 | * @file: opened file structure | |
97 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
98 | * |
99 | */ | |
100 | ||
8f29843a | 101 | static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx) |
7751bdb3 | 102 | { |
8f29843a | 103 | bool over; |
7751bdb3 SK |
104 | struct p9_wstat st; |
105 | int err = 0; | |
106 | struct p9_fid *fid; | |
107 | int buflen; | |
7751bdb3 | 108 | struct p9_rdir *rdir; |
e1200fe6 | 109 | struct kvec kvec; |
7751bdb3 | 110 | |
4b8e9923 | 111 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 112 | fid = file->private_data; |
7751bdb3 SK |
113 | |
114 | buflen = fid->clnt->msize - P9_IOHDRSZ; | |
115 | ||
8f29843a | 116 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
117 | if (!rdir) |
118 | return -ENOMEM; | |
e1200fe6 AV |
119 | kvec.iov_base = rdir->buf; |
120 | kvec.iov_len = buflen; | |
3e2796a9 | 121 | |
7ffdea7e | 122 | while (1) { |
3e2796a9 | 123 | if (rdir->tail == rdir->head) { |
e1200fe6 AV |
124 | struct iov_iter to; |
125 | int n; | |
126 | iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen); | |
127 | n = p9_client_read(file->private_data, ctx->pos, &to, | |
128 | &err); | |
129 | if (err) | |
7ffdea7e | 130 | return err; |
8e3c5005 JB |
131 | if (n == 0) |
132 | return 0; | |
3e2796a9 EVH |
133 | |
134 | rdir->head = 0; | |
e1200fe6 | 135 | rdir->tail = n; |
3e2796a9 | 136 | } |
3e2796a9 | 137 | while (rdir->head < rdir->tail) { |
348b5901 AK |
138 | err = p9stat_read(fid->clnt, rdir->buf + rdir->head, |
139 | rdir->tail - rdir->head, &st); | |
c9a58199 | 140 | if (err <= 0) { |
5d385153 | 141 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 142 | return -EIO; |
06b55b46 | 143 | } |
06b55b46 | 144 | |
8f29843a AV |
145 | over = !dir_emit(ctx, st.name, strlen(st.name), |
146 | v9fs_qid2ino(&st.qid), dt_type(&st)); | |
02da398b | 147 | p9stat_free(&st); |
7ffdea7e AV |
148 | if (over) |
149 | return 0; | |
150 | ||
c9a58199 GH |
151 | rdir->head += err; |
152 | ctx->pos += err; | |
06b55b46 | 153 | } |
e69e7fe5 | 154 | } |
e69e7fe5 EVH |
155 | } |
156 | ||
7751bdb3 | 157 | /** |
8f29843a AV |
158 | * v9fs_dir_readdir_dotl - iterate through a directory |
159 | * @file: opened file structure | |
160 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
161 | * |
162 | */ | |
8f29843a | 163 | static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx) |
7751bdb3 | 164 | { |
7751bdb3 SK |
165 | int err = 0; |
166 | struct p9_fid *fid; | |
167 | int buflen; | |
168 | struct p9_rdir *rdir; | |
169 | struct p9_dirent curdirent; | |
7751bdb3 | 170 | |
4b8e9923 | 171 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 172 | fid = file->private_data; |
7751bdb3 SK |
173 | |
174 | buflen = fid->clnt->msize - P9_READDIRHDRSZ; | |
175 | ||
8f29843a | 176 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
177 | if (!rdir) |
178 | return -ENOMEM; | |
7751bdb3 | 179 | |
7ffdea7e | 180 | while (1) { |
7751bdb3 SK |
181 | if (rdir->tail == rdir->head) { |
182 | err = p9_client_readdir(fid, rdir->buf, buflen, | |
8f29843a | 183 | ctx->pos); |
7751bdb3 | 184 | if (err <= 0) |
7ffdea7e | 185 | return err; |
7751bdb3 SK |
186 | |
187 | rdir->head = 0; | |
188 | rdir->tail = err; | |
189 | } | |
190 | ||
191 | while (rdir->head < rdir->tail) { | |
192 | ||
348b5901 AK |
193 | err = p9dirent_read(fid->clnt, rdir->buf + rdir->head, |
194 | rdir->tail - rdir->head, | |
195 | &curdirent); | |
7751bdb3 | 196 | if (err < 0) { |
5d385153 | 197 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 198 | return -EIO; |
7751bdb3 SK |
199 | } |
200 | ||
8f29843a AV |
201 | if (!dir_emit(ctx, curdirent.d_name, |
202 | strlen(curdirent.d_name), | |
203 | v9fs_qid2ino(&curdirent.qid), | |
204 | curdirent.d_type)) | |
7ffdea7e | 205 | return 0; |
7751bdb3 | 206 | |
8f29843a | 207 | ctx->pos = curdirent.d_off; |
7751bdb3 SK |
208 | rdir->head += err; |
209 | } | |
210 | } | |
7751bdb3 SK |
211 | } |
212 | ||
bd238fb4 | 213 | |
e69e7fe5 EVH |
214 | /** |
215 | * v9fs_dir_release - close a directory | |
216 | * @inode: inode of the directory | |
217 | * @filp: file pointer to a directory | |
218 | * | |
219 | */ | |
220 | ||
221 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
222 | { | |
bd238fb4 | 223 | struct p9_fid *fid; |
e69e7fe5 | 224 | |
bd238fb4 | 225 | fid = filp->private_data; |
5d385153 JP |
226 | p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", |
227 | inode, filp, fid ? fid->fid : -1); | |
62726a7a | 228 | if (fid) |
229 | p9_client_clunk(fid); | |
e69e7fe5 EVH |
230 | return 0; |
231 | } | |
232 | ||
4b6f5d20 | 233 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 234 | .read = generic_read_dir, |
59af1584 | 235 | .llseek = generic_file_llseek, |
5963ded8 | 236 | .iterate_shared = v9fs_dir_readdir, |
e69e7fe5 EVH |
237 | .open = v9fs_file_open, |
238 | .release = v9fs_dir_release, | |
239 | }; | |
9b6533c9 SK |
240 | |
241 | const struct file_operations v9fs_dir_operations_dotl = { | |
242 | .read = generic_read_dir, | |
243 | .llseek = generic_file_llseek, | |
5963ded8 | 244 | .iterate_shared = v9fs_dir_readdir_dotl, |
9b6533c9 SK |
245 | .open = v9fs_file_open, |
246 | .release = v9fs_dir_release, | |
b165d601 | 247 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 248 | }; |