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27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/file.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/inet.h>
35#include <linux/pagemap.h>
36#include <linux/seq_file.h>
37#include <linux/mount.h>
38#include <linux/idr.h>
39#include <linux/sched.h>
40#include <linux/slab.h>
41#include <linux/statfs.h>
42#include <linux/magic.h>
43#include <net/9p/9p.h>
44#include <net/9p/client.h>
45
46#include "v9fs.h"
47#include "v9fs_vfs.h"
48#include "fid.h"
49#include "xattr.h"
50#include "acl.h"
51
52static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
53
54
55
56
57
58
59
60
61static int v9fs_set_super(struct super_block *s, void *data)
62{
63 s->s_fs_info = data;
64 return set_anon_super(s, data);
65}
66
67
68
69
70
71
72
73
74
75static void
76v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
77 int flags, void *data)
78{
79 sb->s_maxbytes = MAX_LFS_FILESIZE;
80 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
81 sb->s_blocksize = 1 << sb->s_blocksize_bits;
82 sb->s_magic = V9FS_MAGIC;
83 if (v9fs_proto_dotl(v9ses)) {
84 sb->s_op = &v9fs_super_ops_dotl;
85 sb->s_xattr = v9fs_xattr_handlers;
86 } else
87 sb->s_op = &v9fs_super_ops;
88 sb->s_bdi = &v9ses->bdi;
89 if (v9ses->cache)
90 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
91
92 sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
93 if (!v9ses->cache)
94 sb->s_flags |= MS_SYNCHRONOUS;
95
96#ifdef CONFIG_9P_FS_POSIX_ACL
97 if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
98 sb->s_flags |= MS_POSIXACL;
99#endif
100
101 save_mount_options(sb, data);
102}
103
104
105
106
107
108
109
110
111
112
113static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
114 const char *dev_name, void *data)
115{
116 struct super_block *sb = NULL;
117 struct inode *inode = NULL;
118 struct dentry *root = NULL;
119 struct v9fs_session_info *v9ses = NULL;
120 int mode = S_IRWXUGO | S_ISVTX;
121 struct p9_fid *fid;
122 int retval = 0;
123
124 P9_DPRINTK(P9_DEBUG_VFS, " \n");
125
126 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
127 if (!v9ses)
128 return ERR_PTR(-ENOMEM);
129
130 fid = v9fs_session_init(v9ses, dev_name, data);
131 if (IS_ERR(fid)) {
132 retval = PTR_ERR(fid);
133
134
135
136
137 goto close_session;
138 }
139
140 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
141 if (IS_ERR(sb)) {
142 retval = PTR_ERR(sb);
143 goto clunk_fid;
144 }
145 v9fs_fill_super(sb, v9ses, flags, data);
146
147 if (v9ses->cache)
148 sb->s_d_op = &v9fs_cached_dentry_operations;
149 else
150 sb->s_d_op = &v9fs_dentry_operations;
151
152 inode = v9fs_get_inode(sb, S_IFDIR | mode);
153 if (IS_ERR(inode)) {
154 retval = PTR_ERR(inode);
155 goto release_sb;
156 }
157
158 root = d_alloc_root(inode);
159 if (!root) {
160 iput(inode);
161 retval = -ENOMEM;
162 goto release_sb;
163 }
164 sb->s_root = root;
165 if (v9fs_proto_dotl(v9ses)) {
166 struct p9_stat_dotl *st = NULL;
167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
168 if (IS_ERR(st)) {
169 retval = PTR_ERR(st);
170 goto release_sb;
171 }
172 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
173 v9fs_stat2inode_dotl(st, root->d_inode);
174 kfree(st);
175 } else {
176 struct p9_wstat *st = NULL;
177 st = p9_client_stat(fid);
178 if (IS_ERR(st)) {
179 retval = PTR_ERR(st);
180 goto release_sb;
181 }
182
183 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
184 v9fs_stat2inode(st, root->d_inode, sb);
185
186 p9stat_free(st);
187 kfree(st);
188 }
189 retval = v9fs_get_acl(inode, fid);
190 if (retval)
191 goto release_sb;
192 v9fs_fid_add(root, fid);
193
194 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
195 return dget(sb->s_root);
196
197clunk_fid:
198 p9_client_clunk(fid);
199close_session:
200 v9fs_session_close(v9ses);
201 kfree(v9ses);
202 return ERR_PTR(retval);
203
204release_sb:
205
206
207
208
209
210
211 p9_client_clunk(fid);
212 deactivate_locked_super(sb);
213 return ERR_PTR(retval);
214}
215
216
217
218
219
220
221
222static void v9fs_kill_super(struct super_block *s)
223{
224 struct v9fs_session_info *v9ses = s->s_fs_info;
225
226 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
227
228 kill_anon_super(s);
229
230 v9fs_session_cancel(v9ses);
231 v9fs_session_close(v9ses);
232 kfree(v9ses);
233 s->s_fs_info = NULL;
234 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
235}
236
237static void
238v9fs_umount_begin(struct super_block *sb)
239{
240 struct v9fs_session_info *v9ses;
241
242 v9ses = sb->s_fs_info;
243 v9fs_session_begin_cancel(v9ses);
244}
245
246static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
247{
248 struct v9fs_session_info *v9ses;
249 struct p9_fid *fid;
250 struct p9_rstatfs rs;
251 int res;
252
253 fid = v9fs_fid_lookup(dentry);
254 if (IS_ERR(fid)) {
255 res = PTR_ERR(fid);
256 goto done;
257 }
258
259 v9ses = v9fs_dentry2v9ses(dentry);
260 if (v9fs_proto_dotl(v9ses)) {
261 res = p9_client_statfs(fid, &rs);
262 if (res == 0) {
263 buf->f_type = V9FS_MAGIC;
264 buf->f_bsize = rs.bsize;
265 buf->f_blocks = rs.blocks;
266 buf->f_bfree = rs.bfree;
267 buf->f_bavail = rs.bavail;
268 buf->f_files = rs.files;
269 buf->f_ffree = rs.ffree;
270 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
271 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
272 buf->f_namelen = rs.namelen;
273 }
274 if (res != -ENOSYS)
275 goto done;
276 }
277 res = simple_statfs(dentry, buf);
278done:
279 return res;
280}
281
282static int v9fs_drop_inode(struct inode *inode)
283{
284 struct v9fs_session_info *v9ses;
285 v9ses = v9fs_inode2v9ses(inode);
286 if (v9ses->cache)
287 return generic_drop_inode(inode);
288
289
290
291
292
293 return 1;
294}
295
296static int v9fs_write_inode(struct inode *inode,
297 struct writeback_control *wbc)
298{
299 int ret;
300 struct p9_wstat wstat;
301 struct v9fs_inode *v9inode;
302
303
304
305
306 P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
307 v9inode = V9FS_I(inode);
308 if (!v9inode->writeback_fid)
309 return 0;
310 v9fs_blank_wstat(&wstat);
311
312 ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
313 if (ret < 0) {
314 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
315 return ret;
316 }
317 return 0;
318}
319
320static int v9fs_write_inode_dotl(struct inode *inode,
321 struct writeback_control *wbc)
322{
323 int ret;
324 struct v9fs_inode *v9inode;
325
326
327
328
329 P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
330 v9inode = V9FS_I(inode);
331 if (!v9inode->writeback_fid)
332 return 0;
333 ret = p9_client_fsync(v9inode->writeback_fid, 0);
334 if (ret < 0) {
335 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
336 return ret;
337 }
338 return 0;
339}
340
341static const struct super_operations v9fs_super_ops = {
342 .alloc_inode = v9fs_alloc_inode,
343 .destroy_inode = v9fs_destroy_inode,
344 .statfs = simple_statfs,
345 .evict_inode = v9fs_evict_inode,
346 .show_options = generic_show_options,
347 .umount_begin = v9fs_umount_begin,
348 .write_inode = v9fs_write_inode,
349};
350
351static const struct super_operations v9fs_super_ops_dotl = {
352 .alloc_inode = v9fs_alloc_inode,
353 .destroy_inode = v9fs_destroy_inode,
354 .statfs = v9fs_statfs,
355 .drop_inode = v9fs_drop_inode,
356 .evict_inode = v9fs_evict_inode,
357 .show_options = generic_show_options,
358 .umount_begin = v9fs_umount_begin,
359 .write_inode = v9fs_write_inode_dotl,
360};
361
362struct file_system_type v9fs_fs_type = {
363 .name = "9p",
364 .mount = v9fs_mount,
365 .kill_sb = v9fs_kill_super,
366 .owner = THIS_MODULE,
367 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT,
368};
369
