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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> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
e1200fe6 | 17 | #include <linux/uio.h> |
24e42e32 | 18 | #include <linux/fscache.h> |
bd238fb4 LI |
19 | #include <net/9p/9p.h> |
20 | #include <net/9p/client.h> | |
e69e7fe5 | 21 | |
e69e7fe5 | 22 | #include "v9fs.h" |
531b1094 | 23 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
24 | #include "fid.h" |
25 | ||
3e2796a9 EVH |
26 | /** |
27 | * struct p9_rdir - readdir accounting | |
3e2796a9 EVH |
28 | * @head: start offset of current dirread buffer |
29 | * @tail: end offset of current dirread buffer | |
30 | * @buf: dirread buffer | |
31 | * | |
32 | * private structure for keeping track of readdir | |
33 | * allocated on demand | |
34 | */ | |
35 | ||
36 | struct p9_rdir { | |
3e2796a9 EVH |
37 | int head; |
38 | int tail; | |
7ffdea7e | 39 | uint8_t buf[]; |
3e2796a9 EVH |
40 | }; |
41 | ||
e69e7fe5 EVH |
42 | /** |
43 | * dt_type - return file type | |
44 | * @mistat: mistat structure | |
45 | * | |
46 | */ | |
47 | ||
02da398b | 48 | static inline int dt_type(struct p9_wstat *mistat) |
e69e7fe5 EVH |
49 | { |
50 | unsigned long perm = mistat->mode; | |
51 | int rettype = DT_REG; | |
52 | ||
bd238fb4 | 53 | if (perm & P9_DMDIR) |
e69e7fe5 | 54 | rettype = DT_DIR; |
bd238fb4 | 55 | if (perm & P9_DMSYMLINK) |
e69e7fe5 EVH |
56 | rettype = DT_LNK; |
57 | ||
58 | return rettype; | |
59 | } | |
60 | ||
61 | /** | |
7751bdb3 | 62 | * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir |
ee443996 | 63 | * @filp: opened file structure |
7751bdb3 | 64 | * @buflen: Length in bytes of buffer to allocate |
e69e7fe5 EVH |
65 | * |
66 | */ | |
67 | ||
7ffdea7e | 68 | static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen) |
e69e7fe5 | 69 | { |
7ffdea7e | 70 | struct p9_fid *fid = filp->private_data; |
6d66ffc1 | 71 | |
7ffdea7e AV |
72 | if (!fid->rdir) |
73 | fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL); | |
74 | return fid->rdir; | |
7751bdb3 SK |
75 | } |
76 | ||
77 | /** | |
8f29843a AV |
78 | * v9fs_dir_readdir - iterate through a directory |
79 | * @file: opened file structure | |
80 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
81 | * |
82 | */ | |
83 | ||
8f29843a | 84 | static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx) |
7751bdb3 | 85 | { |
8f29843a | 86 | bool over; |
7751bdb3 SK |
87 | struct p9_wstat st; |
88 | int err = 0; | |
89 | struct p9_fid *fid; | |
90 | int buflen; | |
7751bdb3 | 91 | struct p9_rdir *rdir; |
e1200fe6 | 92 | struct kvec kvec; |
7751bdb3 | 93 | |
4b8e9923 | 94 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 95 | fid = file->private_data; |
7751bdb3 SK |
96 | |
97 | buflen = fid->clnt->msize - P9_IOHDRSZ; | |
98 | ||
8f29843a | 99 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
100 | if (!rdir) |
101 | return -ENOMEM; | |
e1200fe6 AV |
102 | kvec.iov_base = rdir->buf; |
103 | kvec.iov_len = buflen; | |
3e2796a9 | 104 | |
7ffdea7e | 105 | while (1) { |
3e2796a9 | 106 | if (rdir->tail == rdir->head) { |
e1200fe6 AV |
107 | struct iov_iter to; |
108 | int n; | |
6d66ffc1 | 109 | |
de4eda9d | 110 | iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buflen); |
e1200fe6 AV |
111 | n = p9_client_read(file->private_data, ctx->pos, &to, |
112 | &err); | |
113 | if (err) | |
7ffdea7e | 114 | return err; |
8e3c5005 JB |
115 | if (n == 0) |
116 | return 0; | |
3e2796a9 EVH |
117 | |
118 | rdir->head = 0; | |
e1200fe6 | 119 | rdir->tail = n; |
3e2796a9 | 120 | } |
3e2796a9 | 121 | while (rdir->head < rdir->tail) { |
348b5901 AK |
122 | err = p9stat_read(fid->clnt, rdir->buf + rdir->head, |
123 | rdir->tail - rdir->head, &st); | |
2803cf43 | 124 | if (err <= 0) { |
5d385153 | 125 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 126 | return -EIO; |
06b55b46 | 127 | } |
06b55b46 | 128 | |
8f29843a AV |
129 | over = !dir_emit(ctx, st.name, strlen(st.name), |
130 | v9fs_qid2ino(&st.qid), dt_type(&st)); | |
02da398b | 131 | p9stat_free(&st); |
7ffdea7e AV |
132 | if (over) |
133 | return 0; | |
134 | ||
2803cf43 GH |
135 | rdir->head += err; |
136 | ctx->pos += err; | |
06b55b46 | 137 | } |
e69e7fe5 | 138 | } |
e69e7fe5 EVH |
139 | } |
140 | ||
7751bdb3 | 141 | /** |
8f29843a AV |
142 | * v9fs_dir_readdir_dotl - iterate through a directory |
143 | * @file: opened file structure | |
144 | * @ctx: actor we feed the entries to | |
7751bdb3 SK |
145 | * |
146 | */ | |
8f29843a | 147 | static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx) |
7751bdb3 | 148 | { |
7751bdb3 SK |
149 | int err = 0; |
150 | struct p9_fid *fid; | |
151 | int buflen; | |
152 | struct p9_rdir *rdir; | |
153 | struct p9_dirent curdirent; | |
7751bdb3 | 154 | |
4b8e9923 | 155 | p9_debug(P9_DEBUG_VFS, "name %pD\n", file); |
8f29843a | 156 | fid = file->private_data; |
7751bdb3 SK |
157 | |
158 | buflen = fid->clnt->msize - P9_READDIRHDRSZ; | |
159 | ||
8f29843a | 160 | rdir = v9fs_alloc_rdir_buf(file, buflen); |
7ffdea7e AV |
161 | if (!rdir) |
162 | return -ENOMEM; | |
7751bdb3 | 163 | |
7ffdea7e | 164 | while (1) { |
7751bdb3 SK |
165 | if (rdir->tail == rdir->head) { |
166 | err = p9_client_readdir(fid, rdir->buf, buflen, | |
8f29843a | 167 | ctx->pos); |
7751bdb3 | 168 | if (err <= 0) |
7ffdea7e | 169 | return err; |
7751bdb3 SK |
170 | |
171 | rdir->head = 0; | |
172 | rdir->tail = err; | |
173 | } | |
174 | ||
175 | while (rdir->head < rdir->tail) { | |
176 | ||
348b5901 AK |
177 | err = p9dirent_read(fid->clnt, rdir->buf + rdir->head, |
178 | rdir->tail - rdir->head, | |
179 | &curdirent); | |
7751bdb3 | 180 | if (err < 0) { |
5d385153 | 181 | p9_debug(P9_DEBUG_VFS, "returned %d\n", err); |
7ffdea7e | 182 | return -EIO; |
7751bdb3 SK |
183 | } |
184 | ||
8f29843a AV |
185 | if (!dir_emit(ctx, curdirent.d_name, |
186 | strlen(curdirent.d_name), | |
187 | v9fs_qid2ino(&curdirent.qid), | |
188 | curdirent.d_type)) | |
7ffdea7e | 189 | return 0; |
7751bdb3 | 190 | |
8f29843a | 191 | ctx->pos = curdirent.d_off; |
7751bdb3 SK |
192 | rdir->head += err; |
193 | } | |
194 | } | |
7751bdb3 SK |
195 | } |
196 | ||
bd238fb4 | 197 | |
e69e7fe5 | 198 | /** |
d9bc0d11 EVH |
199 | * v9fs_dir_release - close a directory or a file |
200 | * @inode: inode of the directory or file | |
201 | * @filp: file pointer to a directory or file | |
e69e7fe5 EVH |
202 | * |
203 | */ | |
204 | ||
205 | int v9fs_dir_release(struct inode *inode, struct file *filp) | |
206 | { | |
24e42e32 | 207 | struct v9fs_inode *v9inode = V9FS_I(inode); |
bd238fb4 | 208 | struct p9_fid *fid; |
24e42e32 DH |
209 | __le32 version; |
210 | loff_t i_size; | |
eee4a119 | 211 | int retval = 0, put_err; |
e69e7fe5 | 212 | |
bd238fb4 | 213 | fid = filp->private_data; |
5d385153 JP |
214 | p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", |
215 | inode, filp, fid ? fid->fid : -1); | |
d9bc0d11 | 216 | |
6636b6dc | 217 | if (fid) { |
d9bc0d11 EVH |
218 | if ((S_ISREG(inode->i_mode)) && (filp->f_mode & FMODE_WRITE)) |
219 | retval = filemap_fdatawrite(inode->i_mapping); | |
220 | ||
6636b6dc JW |
221 | spin_lock(&inode->i_lock); |
222 | hlist_del(&fid->ilist); | |
223 | spin_unlock(&inode->i_lock); | |
eee4a119 DM |
224 | put_err = p9_fid_put(fid); |
225 | retval = retval < 0 ? retval : put_err; | |
6636b6dc | 226 | } |
24e42e32 DH |
227 | |
228 | if ((filp->f_mode & FMODE_WRITE)) { | |
229 | version = cpu_to_le32(v9inode->qid.version); | |
230 | i_size = i_size_read(inode); | |
231 | fscache_unuse_cookie(v9fs_inode_cookie(v9inode), | |
232 | &version, &i_size); | |
233 | } else { | |
234 | fscache_unuse_cookie(v9fs_inode_cookie(v9inode), NULL, NULL); | |
235 | } | |
89c58cb3 | 236 | return retval; |
e69e7fe5 EVH |
237 | } |
238 | ||
4b6f5d20 | 239 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 240 | .read = generic_read_dir, |
59af1584 | 241 | .llseek = generic_file_llseek, |
5963ded8 | 242 | .iterate_shared = v9fs_dir_readdir, |
e69e7fe5 EVH |
243 | .open = v9fs_file_open, |
244 | .release = v9fs_dir_release, | |
245 | }; | |
9b6533c9 SK |
246 | |
247 | const struct file_operations v9fs_dir_operations_dotl = { | |
248 | .read = generic_read_dir, | |
249 | .llseek = generic_file_llseek, | |
5963ded8 | 250 | .iterate_shared = v9fs_dir_readdir_dotl, |
9b6533c9 SK |
251 | .open = v9fs_file_open, |
252 | .release = v9fs_dir_release, | |
6d66ffc1 | 253 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 254 | }; |