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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e69e7fe5 | 2 | /* |
e69e7fe5 EVH |
3 | * This file contains vfs directory ops for the 9P2000 protocol. |
4 | * | |
5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
e69e7fe5 EVH |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/string.h> | |
914e2637 | 15 | #include <linux/sched.h> |
e69e7fe5 EVH |
16 | #include <linux/inet.h> |
17 | #include <linux/idr.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e1200fe6 | 19 | #include <linux/uio.h> |
24e42e32 | 20 | #include <linux/fscache.h> |
bd238fb4 LI |
21 | #include <net/9p/9p.h> |
22 | #include <net/9p/client.h> | |
e69e7fe5 | 23 | |
e69e7fe5 | 24 | #include "v9fs.h" |
531b1094 | 25 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
26 | #include "fid.h" |
27 | ||
3e2796a9 EVH |
28 | /** |
29 | * struct p9_rdir - readdir accounting | |
3e2796a9 EVH |
30 | * @head: start offset of current dirread buffer |
31 | * @tail: end offset of current dirread buffer | |
32 | * @buf: dirread buffer | |
33 | * | |
34 | * private structure for keeping track of readdir | |
35 | * allocated on demand | |
36 | */ | |
37 | ||
38 | struct p9_rdir { | |
3e2796a9 EVH |
39 | int head; |
40 | int tail; | |
7ffdea7e | 41 | uint8_t buf[]; |
3e2796a9 EVH |
42 | }; |
43 | ||
e69e7fe5 EVH |
44 | /** |
45 | * dt_type - return file type | |
46 | * @mistat: mistat structure | |
47 | * | |
48 | */ | |
49 | ||
02da398b | 50 | static inline int dt_type(struct p9_wstat *mistat) |
e69e7fe5 EVH |
51 | { |
52 | unsigned long perm = mistat->mode; | |
53 | int rettype = DT_REG; | |
54 | ||
bd238fb4 | 55 | if (perm & P9_DMDIR) |
e69e7fe5 | 56 | rettype = DT_DIR; |
bd238fb4 | 57 | if (perm & P9_DMSYMLINK) |
e69e7fe5 EVH |
58 | rettype = DT_LNK; |
59 | ||
60 | return rettype; | |
61 | } | |
62 | ||
63 | /** | |
7751bdb3 | 64 | * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir |
ee443996 | 65 | * @filp: opened file structure |
7751bdb3 | 66 | * @buflen: Length in bytes of buffer to allocate |
e69e7fe5 EVH |
67 | * |
68 | */ | |
69 | ||
7ffdea7e | 70 | static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen) |
e69e7fe5 | 71 | { |
7ffdea7e | 72 | struct p9_fid *fid = filp->private_data; |
6d66ffc1 | 73 | |
7ffdea7e AV |
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; | |
6d66ffc1 | 111 | |
aa563d7b | 112 | iov_iter_kvec(&to, READ, &kvec, 1, buflen); |
e1200fe6 AV |
113 | n = p9_client_read(file->private_data, ctx->pos, &to, |
114 | &err); | |
115 | if (err) | |
7ffdea7e | 116 | return err; |
8e3c5005 JB |
117 | if (n == 0) |
118 | return 0; | |
3e2796a9 EVH |
119 | |
120 | rdir->head = 0; | |
e1200fe6 | 121 | rdir->tail = n; |
3e2796a9 | 122 | } |
3e2796a9 | 123 | while (rdir->head < rdir->tail) { |
348b5901 AK |
124 | err = p9stat_read(fid->clnt, rdir->buf + rdir->head, |
125 | rdir->tail - rdir->head, &st); | |
2803cf43 | 126 | if (err <= 0) { |
5d385153 | 127 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 128 | return -EIO; |
06b55b46 | 129 | } |
06b55b46 | 130 | |
8f29843a AV |
131 | over = !dir_emit(ctx, st.name, strlen(st.name), |
132 | v9fs_qid2ino(&st.qid), dt_type(&st)); | |
02da398b | 133 | p9stat_free(&st); |
7ffdea7e AV |
134 | if (over) |
135 | return 0; | |
136 | ||
2803cf43 GH |
137 | rdir->head += err; |
138 | ctx->pos += err; | |
06b55b46 | 139 | } |
e69e7fe5 | 140 | } |
e69e7fe5 EVH |
141 | } |
142 | ||
7751bdb3 | 143 | /** |
8f29843a AV |
144 | * v9fs_dir_readdir_dotl - iterate through a directory |
145 | * @file: opened file structure | |
146 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
147 | * |
148 | */ | |
8f29843a | 149 | static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx) |
7751bdb3 | 150 | { |
7751bdb3 SK |
151 | int err = 0; |
152 | struct p9_fid *fid; | |
153 | int buflen; | |
154 | struct p9_rdir *rdir; | |
155 | struct p9_dirent curdirent; | |
7751bdb3 | 156 | |
4b8e9923 | 157 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 158 | fid = file->private_data; |
7751bdb3 SK |
159 | |
160 | buflen = fid->clnt->msize - P9_READDIRHDRSZ; | |
161 | ||
8f29843a | 162 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
163 | if (!rdir) |
164 | return -ENOMEM; | |
7751bdb3 | 165 | |
7ffdea7e | 166 | while (1) { |
7751bdb3 SK |
167 | if (rdir->tail == rdir->head) { |
168 | err = p9_client_readdir(fid, rdir->buf, buflen, | |
8f29843a | 169 | ctx->pos); |
7751bdb3 | 170 | if (err <= 0) |
7ffdea7e | 171 | return err; |
7751bdb3 SK |
172 | |
173 | rdir->head = 0; | |
174 | rdir->tail = err; | |
175 | } | |
176 | ||
177 | while (rdir->head < rdir->tail) { | |
178 | ||
348b5901 AK |
179 | err = p9dirent_read(fid->clnt, rdir->buf + rdir->head, |
180 | rdir->tail - rdir->head, | |
181 | &curdirent); | |
7751bdb3 | 182 | if (err < 0) { |
5d385153 | 183 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 184 | return -EIO; |
7751bdb3 SK |
185 | } |
186 | ||
8f29843a AV |
187 | if (!dir_emit(ctx, curdirent.d_name, |
188 | strlen(curdirent.d_name), | |
189 | v9fs_qid2ino(&curdirent.qid), | |
190 | curdirent.d_type)) | |
7ffdea7e | 191 | return 0; |
7751bdb3 | 192 | |
8f29843a | 193 | ctx->pos = curdirent.d_off; |
7751bdb3 SK |
194 | rdir->head += err; |
195 | } | |
196 | } | |
7751bdb3 SK |
197 | } |
198 | ||
bd238fb4 | 199 | |
e69e7fe5 EVH |
200 | /** |
201 | * v9fs_dir_release - close a directory | |
202 | * @inode: inode of the directory | |
203 | * @filp: file pointer to a directory | |
204 | * | |
205 | */ | |
206 | ||
207 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
208 | { | |
24e42e32 | 209 | struct v9fs_inode *v9inode = V9FS_I(inode); |
bd238fb4 | 210 | struct p9_fid *fid; |
24e42e32 DH |
211 | __le32 version; |
212 | loff_t i_size; | |
e69e7fe5 | 213 | |
bd238fb4 | 214 | fid = filp->private_data; |
5d385153 JP |
215 | p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", |
216 | inode, filp, fid ? fid->fid : -1); | |
6636b6dc JW |
217 | if (fid) { |
218 | spin_lock(&inode->i_lock); | |
219 | hlist_del(&fid->ilist); | |
220 | spin_unlock(&inode->i_lock); | |
b48dbb99 | 221 | p9_fid_put(fid); |
6636b6dc | 222 | } |
24e42e32 DH |
223 | |
224 | if ((filp->f_mode & FMODE_WRITE)) { | |
225 | version = cpu_to_le32(v9inode->qid.version); | |
226 | i_size = i_size_read(inode); | |
227 | fscache_unuse_cookie(v9fs_inode_cookie(v9inode), | |
228 | &version, &i_size); | |
229 | } else { | |
230 | fscache_unuse_cookie(v9fs_inode_cookie(v9inode), NULL, NULL); | |
231 | } | |
e69e7fe5 EVH |
232 | return 0; |
233 | } | |
234 | ||
4b6f5d20 | 235 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 236 | .read = generic_read_dir, |
59af1584 | 237 | .llseek = generic_file_llseek, |
5963ded8 | 238 | .iterate_shared = v9fs_dir_readdir, |
e69e7fe5 EVH |
239 | .open = v9fs_file_open, |
240 | .release = v9fs_dir_release, | |
241 | }; | |
9b6533c9 SK |
242 | |
243 | const struct file_operations v9fs_dir_operations_dotl = { | |
244 | .read = generic_read_dir, | |
245 | .llseek = generic_file_llseek, | |
5963ded8 | 246 | .iterate_shared = v9fs_dir_readdir_dotl, |
9b6533c9 SK |
247 | .open = v9fs_file_open, |
248 | .release = v9fs_dir_release, | |
6d66ffc1 | 249 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 250 | }; |