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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 |= 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 umode_t mode = S_IRWXUGO | S_ISVTX;
121 struct p9_fid *fid;
122 int retval = 0;
123
124 p9_debug(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 goto free_session;
134 }
135
136 sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
137 if (IS_ERR(sb)) {
138 retval = PTR_ERR(sb);
139 goto clunk_fid;
140 }
141 v9fs_fill_super(sb, v9ses, flags, data);
142
143 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
144 sb->s_d_op = &v9fs_cached_dentry_operations;
145 else
146 sb->s_d_op = &v9fs_dentry_operations;
147
148 inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
149 if (IS_ERR(inode)) {
150 retval = PTR_ERR(inode);
151 goto release_sb;
152 }
153
154 root = d_make_root(inode);
155 if (!root) {
156 retval = -ENOMEM;
157 goto release_sb;
158 }
159 sb->s_root = root;
160 if (v9fs_proto_dotl(v9ses)) {
161 struct p9_stat_dotl *st = NULL;
162 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
163 if (IS_ERR(st)) {
164 retval = PTR_ERR(st);
165 goto release_sb;
166 }
167 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
168 v9fs_stat2inode_dotl(st, d_inode(root));
169 kfree(st);
170 } else {
171 struct p9_wstat *st = NULL;
172 st = p9_client_stat(fid);
173 if (IS_ERR(st)) {
174 retval = PTR_ERR(st);
175 goto release_sb;
176 }
177
178 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
179 v9fs_stat2inode(st, d_inode(root), sb);
180
181 p9stat_free(st);
182 kfree(st);
183 }
184 retval = v9fs_get_acl(inode, fid);
185 if (retval)
186 goto release_sb;
187 v9fs_fid_add(root, fid);
188
189 p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
190 return dget(sb->s_root);
191
192clunk_fid:
193 p9_client_clunk(fid);
194 v9fs_session_close(v9ses);
195free_session:
196 kfree(v9ses);
197 return ERR_PTR(retval);
198
199release_sb:
200
201
202
203
204
205
206 p9_client_clunk(fid);
207 deactivate_locked_super(sb);
208 return ERR_PTR(retval);
209}
210
211
212
213
214
215
216
217static void v9fs_kill_super(struct super_block *s)
218{
219 struct v9fs_session_info *v9ses = s->s_fs_info;
220
221 p9_debug(P9_DEBUG_VFS, " %p\n", s);
222
223 kill_anon_super(s);
224
225 v9fs_session_cancel(v9ses);
226 v9fs_session_close(v9ses);
227 kfree(v9ses);
228 s->s_fs_info = NULL;
229 p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
230}
231
232static void
233v9fs_umount_begin(struct super_block *sb)
234{
235 struct v9fs_session_info *v9ses;
236
237 v9ses = sb->s_fs_info;
238 v9fs_session_begin_cancel(v9ses);
239}
240
241static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
242{
243 struct v9fs_session_info *v9ses;
244 struct p9_fid *fid;
245 struct p9_rstatfs rs;
246 int res;
247
248 fid = v9fs_fid_lookup(dentry);
249 if (IS_ERR(fid)) {
250 res = PTR_ERR(fid);
251 goto done;
252 }
253
254 v9ses = v9fs_dentry2v9ses(dentry);
255 if (v9fs_proto_dotl(v9ses)) {
256 res = p9_client_statfs(fid, &rs);
257 if (res == 0) {
258 buf->f_type = rs.type;
259 buf->f_bsize = rs.bsize;
260 buf->f_blocks = rs.blocks;
261 buf->f_bfree = rs.bfree;
262 buf->f_bavail = rs.bavail;
263 buf->f_files = rs.files;
264 buf->f_ffree = rs.ffree;
265 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
266 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
267 buf->f_namelen = rs.namelen;
268 }
269 if (res != -ENOSYS)
270 goto done;
271 }
272 res = simple_statfs(dentry, buf);
273done:
274 return res;
275}
276
277static int v9fs_drop_inode(struct inode *inode)
278{
279 struct v9fs_session_info *v9ses;
280 v9ses = v9fs_inode2v9ses(inode);
281 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
282 return generic_drop_inode(inode);
283
284
285
286
287
288 return 1;
289}
290
291static int v9fs_write_inode(struct inode *inode,
292 struct writeback_control *wbc)
293{
294 int ret;
295 struct p9_wstat wstat;
296 struct v9fs_inode *v9inode;
297
298
299
300
301 p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
302 v9inode = V9FS_I(inode);
303 if (!v9inode->writeback_fid)
304 return 0;
305 v9fs_blank_wstat(&wstat);
306
307 ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
308 if (ret < 0) {
309 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
310 return ret;
311 }
312 return 0;
313}
314
315static int v9fs_write_inode_dotl(struct inode *inode,
316 struct writeback_control *wbc)
317{
318 int ret;
319 struct v9fs_inode *v9inode;
320
321
322
323
324 v9inode = V9FS_I(inode);
325 p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
326 __func__, inode, v9inode->writeback_fid);
327 if (!v9inode->writeback_fid)
328 return 0;
329
330 ret = p9_client_fsync(v9inode->writeback_fid, 0);
331 if (ret < 0) {
332 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
333 return ret;
334 }
335 return 0;
336}
337
338static const struct super_operations v9fs_super_ops = {
339 .alloc_inode = v9fs_alloc_inode,
340 .destroy_inode = v9fs_destroy_inode,
341 .statfs = simple_statfs,
342 .evict_inode = v9fs_evict_inode,
343 .show_options = generic_show_options,
344 .umount_begin = v9fs_umount_begin,
345 .write_inode = v9fs_write_inode,
346};
347
348static const struct super_operations v9fs_super_ops_dotl = {
349 .alloc_inode = v9fs_alloc_inode,
350 .destroy_inode = v9fs_destroy_inode,
351 .statfs = v9fs_statfs,
352 .drop_inode = v9fs_drop_inode,
353 .evict_inode = v9fs_evict_inode,
354 .show_options = generic_show_options,
355 .umount_begin = v9fs_umount_begin,
356 .write_inode = v9fs_write_inode_dotl,
357};
358
359struct file_system_type v9fs_fs_type = {
360 .name = "9p",
361 .mount = v9fs_mount,
362 .kill_sb = v9fs_kill_super,
363 .owner = THIS_MODULE,
364 .fs_flags = FS_RENAME_DOES_D_MOVE,
365};
366MODULE_ALIAS_FS("9p");
367
