Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e69e7fe5 EVH |
2 | /* |
3 | * linux/fs/9p/vfs_dir.c | |
4 | * | |
5 | * This file contains vfs directory ops for the 9P2000 protocol. | |
6 | * | |
7 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
8 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
e69e7fe5 EVH |
9 | */ |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/string.h> | |
914e2637 | 17 | #include <linux/sched.h> |
e69e7fe5 EVH |
18 | #include <linux/inet.h> |
19 | #include <linux/idr.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e1200fe6 | 21 | #include <linux/uio.h> |
bd238fb4 LI |
22 | #include <net/9p/9p.h> |
23 | #include <net/9p/client.h> | |
e69e7fe5 | 24 | |
e69e7fe5 | 25 | #include "v9fs.h" |
531b1094 | 26 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
27 | #include "fid.h" |
28 | ||
3e2796a9 EVH |
29 | /** |
30 | * struct p9_rdir - readdir accounting | |
3e2796a9 EVH |
31 | * @head: start offset of current dirread buffer |
32 | * @tail: end offset of current dirread buffer | |
33 | * @buf: dirread buffer | |
34 | * | |
35 | * private structure for keeping track of readdir | |
36 | * allocated on demand | |
37 | */ | |
38 | ||
39 | struct p9_rdir { | |
3e2796a9 EVH |
40 | int head; |
41 | int tail; | |
7ffdea7e | 42 | uint8_t buf[]; |
3e2796a9 EVH |
43 | }; |
44 | ||
e69e7fe5 EVH |
45 | /** |
46 | * dt_type - return file type | |
47 | * @mistat: mistat structure | |
48 | * | |
49 | */ | |
50 | ||
02da398b | 51 | static inline int dt_type(struct p9_wstat *mistat) |
e69e7fe5 EVH |
52 | { |
53 | unsigned long perm = mistat->mode; | |
54 | int rettype = DT_REG; | |
55 | ||
bd238fb4 | 56 | if (perm & P9_DMDIR) |
e69e7fe5 | 57 | rettype = DT_DIR; |
bd238fb4 | 58 | if (perm & P9_DMSYMLINK) |
e69e7fe5 EVH |
59 | rettype = DT_LNK; |
60 | ||
61 | return rettype; | |
62 | } | |
63 | ||
64 | /** | |
7751bdb3 | 65 | * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir |
ee443996 | 66 | * @filp: opened file structure |
7751bdb3 | 67 | * @buflen: Length in bytes of buffer to allocate |
e69e7fe5 EVH |
68 | * |
69 | */ | |
70 | ||
7ffdea7e | 71 | static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen) |
e69e7fe5 | 72 | { |
7ffdea7e AV |
73 | struct p9_fid *fid = filp->private_data; |
74 | if (!fid->rdir) | |
75 | fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL); | |
76 | return fid->rdir; | |
7751bdb3 SK |
77 | } |
78 | ||
79 | /** | |
8f29843a AV |
80 | * v9fs_dir_readdir - iterate through a directory |
81 | * @file: opened file structure | |
82 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
83 | * |
84 | */ | |
85 | ||
8f29843a | 86 | static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx) |
7751bdb3 | 87 | { |
8f29843a | 88 | bool over; |
7751bdb3 SK |
89 | struct p9_wstat st; |
90 | int err = 0; | |
91 | struct p9_fid *fid; | |
92 | int buflen; | |
7751bdb3 | 93 | struct p9_rdir *rdir; |
e1200fe6 | 94 | struct kvec kvec; |
7751bdb3 | 95 | |
4b8e9923 | 96 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 97 | fid = file->private_data; |
7751bdb3 SK |
98 | |
99 | buflen = fid->clnt->msize - P9_IOHDRSZ; | |
100 | ||
8f29843a | 101 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
102 | if (!rdir) |
103 | return -ENOMEM; | |
e1200fe6 AV |
104 | kvec.iov_base = rdir->buf; |
105 | kvec.iov_len = buflen; | |
3e2796a9 | 106 | |
7ffdea7e | 107 | while (1) { |
3e2796a9 | 108 | if (rdir->tail == rdir->head) { |
e1200fe6 AV |
109 | struct iov_iter to; |
110 | int n; | |
aa563d7b | 111 | iov_iter_kvec(&to, READ, &kvec, 1, buflen); |
e1200fe6 AV |
112 | n = p9_client_read(file->private_data, ctx->pos, &to, |
113 | &err); | |
114 | if (err) | |
7ffdea7e | 115 | return err; |
8e3c5005 JB |
116 | if (n == 0) |
117 | return 0; | |
3e2796a9 EVH |
118 | |
119 | rdir->head = 0; | |
e1200fe6 | 120 | rdir->tail = n; |
3e2796a9 | 121 | } |
3e2796a9 | 122 | while (rdir->head < rdir->tail) { |
348b5901 AK |
123 | err = p9stat_read(fid->clnt, rdir->buf + rdir->head, |
124 | rdir->tail - rdir->head, &st); | |
2803cf43 | 125 | if (err <= 0) { |
5d385153 | 126 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 127 | return -EIO; |
06b55b46 | 128 | } |
06b55b46 | 129 | |
8f29843a AV |
130 | over = !dir_emit(ctx, st.name, strlen(st.name), |
131 | v9fs_qid2ino(&st.qid), dt_type(&st)); | |
02da398b | 132 | p9stat_free(&st); |
7ffdea7e AV |
133 | if (over) |
134 | return 0; | |
135 | ||
2803cf43 GH |
136 | rdir->head += err; |
137 | ctx->pos += err; | |
06b55b46 | 138 | } |
e69e7fe5 | 139 | } |
e69e7fe5 EVH |
140 | } |
141 | ||
7751bdb3 | 142 | /** |
8f29843a AV |
143 | * v9fs_dir_readdir_dotl - iterate through a directory |
144 | * @file: opened file structure | |
145 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
146 | * |
147 | */ | |
8f29843a | 148 | static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx) |
7751bdb3 | 149 | { |
7751bdb3 SK |
150 | int err = 0; |
151 | struct p9_fid *fid; | |
152 | int buflen; | |
153 | struct p9_rdir *rdir; | |
154 | struct p9_dirent curdirent; | |
7751bdb3 | 155 | |
4b8e9923 | 156 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 157 | fid = file->private_data; |
7751bdb3 SK |
158 | |
159 | buflen = fid->clnt->msize - P9_READDIRHDRSZ; | |
160 | ||
8f29843a | 161 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
162 | if (!rdir) |
163 | return -ENOMEM; | |
7751bdb3 | 164 | |
7ffdea7e | 165 | while (1) { |
7751bdb3 SK |
166 | if (rdir->tail == rdir->head) { |
167 | err = p9_client_readdir(fid, rdir->buf, buflen, | |
8f29843a | 168 | ctx->pos); |
7751bdb3 | 169 | if (err <= 0) |
7ffdea7e | 170 | return err; |
7751bdb3 SK |
171 | |
172 | rdir->head = 0; | |
173 | rdir->tail = err; | |
174 | } | |
175 | ||
176 | while (rdir->head < rdir->tail) { | |
177 | ||
348b5901 AK |
178 | err = p9dirent_read(fid->clnt, rdir->buf + rdir->head, |
179 | rdir->tail - rdir->head, | |
180 | &curdirent); | |
7751bdb3 | 181 | if (err < 0) { |
5d385153 | 182 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 183 | return -EIO; |
7751bdb3 SK |
184 | } |
185 | ||
8f29843a AV |
186 | if (!dir_emit(ctx, curdirent.d_name, |
187 | strlen(curdirent.d_name), | |
188 | v9fs_qid2ino(&curdirent.qid), | |
189 | curdirent.d_type)) | |
7ffdea7e | 190 | return 0; |
7751bdb3 | 191 | |
8f29843a | 192 | ctx->pos = curdirent.d_off; |
7751bdb3 SK |
193 | rdir->head += err; |
194 | } | |
195 | } | |
7751bdb3 SK |
196 | } |
197 | ||
bd238fb4 | 198 | |
e69e7fe5 EVH |
199 | /** |
200 | * v9fs_dir_release - close a directory | |
201 | * @inode: inode of the directory | |
202 | * @filp: file pointer to a directory | |
203 | * | |
204 | */ | |
205 | ||
206 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
207 | { | |
bd238fb4 | 208 | struct p9_fid *fid; |
e69e7fe5 | 209 | |
bd238fb4 | 210 | fid = filp->private_data; |
5d385153 JP |
211 | p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", |
212 | inode, filp, fid ? fid->fid : -1); | |
6636b6dc JW |
213 | if (fid) { |
214 | spin_lock(&inode->i_lock); | |
215 | hlist_del(&fid->ilist); | |
216 | spin_unlock(&inode->i_lock); | |
62726a7a | 217 | p9_client_clunk(fid); |
6636b6dc | 218 | } |
e69e7fe5 EVH |
219 | return 0; |
220 | } | |
221 | ||
4b6f5d20 | 222 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 223 | .read = generic_read_dir, |
59af1584 | 224 | .llseek = generic_file_llseek, |
5963ded8 | 225 | .iterate_shared = v9fs_dir_readdir, |
e69e7fe5 EVH |
226 | .open = v9fs_file_open, |
227 | .release = v9fs_dir_release, | |
228 | }; | |
9b6533c9 SK |
229 | |
230 | const struct file_operations v9fs_dir_operations_dotl = { | |
231 | .read = generic_read_dir, | |
232 | .llseek = generic_file_llseek, | |
5963ded8 | 233 | .iterate_shared = v9fs_dir_readdir_dotl, |
9b6533c9 SK |
234 | .open = v9fs_file_open, |
235 | .release = v9fs_dir_release, | |
b165d601 | 236 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 237 | }; |