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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>
15#include <linux/sched.h>
16#include <linux/inet.h>
17#include <linux/idr.h>
18#include <linux/slab.h>
19#include <linux/uio.h>
20#include <linux/fscache.h>
21#include <net/9p/9p.h>
22#include <net/9p/client.h>
23
24#include "v9fs.h"
25#include "v9fs_vfs.h"
26#include "fid.h"
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37
38struct p9_rdir {
39 int head;
40 int tail;
41 uint8_t buf[];
42};
43
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49
50static inline int dt_type(struct p9_wstat *mistat)
51{
52 unsigned long perm = mistat->mode;
53 int rettype = DT_REG;
54
55 if (perm & P9_DMDIR)
56 rettype = DT_DIR;
57 if (perm & P9_DMSYMLINK)
58 rettype = DT_LNK;
59
60 return rettype;
61}
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69
70static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen)
71{
72 struct p9_fid *fid = filp->private_data;
73
74 if (!fid->rdir)
75 fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
76 return fid->rdir;
77}
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84
85
86static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
87{
88 bool over;
89 struct p9_wstat st;
90 int err = 0;
91 struct p9_fid *fid;
92 int buflen;
93 struct p9_rdir *rdir;
94 struct kvec kvec;
95
96 p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
97 fid = file->private_data;
98
99 buflen = fid->clnt->msize - P9_IOHDRSZ;
100
101 rdir = v9fs_alloc_rdir_buf(file, buflen);
102 if (!rdir)
103 return -ENOMEM;
104 kvec.iov_base = rdir->buf;
105 kvec.iov_len = buflen;
106
107 while (1) {
108 if (rdir->tail == rdir->head) {
109 struct iov_iter to;
110 int n;
111
112 iov_iter_kvec(&to, READ, &kvec, 1, buflen);
113 n = p9_client_read(file->private_data, ctx->pos, &to,
114 &err);
115 if (err)
116 return err;
117 if (n == 0)
118 return 0;
119
120 rdir->head = 0;
121 rdir->tail = n;
122 }
123 while (rdir->head < rdir->tail) {
124 err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
125 rdir->tail - rdir->head, &st);
126 if (err <= 0) {
127 p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
128 return -EIO;
129 }
130
131 over = !dir_emit(ctx, st.name, strlen(st.name),
132 v9fs_qid2ino(&st.qid), dt_type(&st));
133 p9stat_free(&st);
134 if (over)
135 return 0;
136
137 rdir->head += err;
138 ctx->pos += err;
139 }
140 }
141}
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148
149static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx)
150{
151 int err = 0;
152 struct p9_fid *fid;
153 int buflen;
154 struct p9_rdir *rdir;
155 struct p9_dirent curdirent;
156
157 p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
158 fid = file->private_data;
159
160 buflen = fid->clnt->msize - P9_READDIRHDRSZ;
161
162 rdir = v9fs_alloc_rdir_buf(file, buflen);
163 if (!rdir)
164 return -ENOMEM;
165
166 while (1) {
167 if (rdir->tail == rdir->head) {
168 err = p9_client_readdir(fid, rdir->buf, buflen,
169 ctx->pos);
170 if (err <= 0)
171 return err;
172
173 rdir->head = 0;
174 rdir->tail = err;
175 }
176
177 while (rdir->head < rdir->tail) {
178
179 err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
180 rdir->tail - rdir->head,
181 &curdirent);
182 if (err < 0) {
183 p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
184 return -EIO;
185 }
186
187 if (!dir_emit(ctx, curdirent.d_name,
188 strlen(curdirent.d_name),
189 v9fs_qid2ino(&curdirent.qid),
190 curdirent.d_type))
191 return 0;
192
193 ctx->pos = curdirent.d_off;
194 rdir->head += err;
195 }
196 }
197}
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206
207int v9fs_dir_release(struct inode *inode, struct file *filp)
208{
209 struct v9fs_inode *v9inode = V9FS_I(inode);
210 struct p9_fid *fid;
211 __le32 version;
212 loff_t i_size;
213
214 fid = filp->private_data;
215 p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
216 inode, filp, fid ? fid->fid : -1);
217 if (fid) {
218 spin_lock(&inode->i_lock);
219 hlist_del(&fid->ilist);
220 spin_unlock(&inode->i_lock);
221 p9_client_clunk(fid);
222 }
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 }
232 return 0;
233}
234
235const struct file_operations v9fs_dir_operations = {
236 .read = generic_read_dir,
237 .llseek = generic_file_llseek,
238 .iterate_shared = v9fs_dir_readdir,
239 .open = v9fs_file_open,
240 .release = v9fs_dir_release,
241};
242
243const struct file_operations v9fs_dir_operations_dotl = {
244 .read = generic_read_dir,
245 .llseek = generic_file_llseek,
246 .iterate_shared = v9fs_dir_readdir_dotl,
247 .open = v9fs_file_open,
248 .release = v9fs_dir_release,
249 .fsync = v9fs_file_fsync_dotl,
250};
251