powerpc/64e: Trivial spelling fixes throughout head_fsl_booke.S
[linux-2.6-microblaze.git] / fs / 9p / vfs_super.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/fs/9p/vfs_super.c
4  *
5  * This file contians superblock ops for 9P2000. It is intended that
6  * you mount this file system on directories.
7  *
8  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
9  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/fs.h>
16 #include <linux/file.h>
17 #include <linux/stat.h>
18 #include <linux/string.h>
19 #include <linux/inet.h>
20 #include <linux/pagemap.h>
21 #include <linux/mount.h>
22 #include <linux/idr.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/statfs.h>
26 #include <linux/magic.h>
27 #include <net/9p/9p.h>
28 #include <net/9p/client.h>
29
30 #include "v9fs.h"
31 #include "v9fs_vfs.h"
32 #include "fid.h"
33 #include "xattr.h"
34 #include "acl.h"
35
36 static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
37
38 /**
39  * v9fs_set_super - set the superblock
40  * @s: super block
41  * @data: file system specific data
42  *
43  */
44
45 static int v9fs_set_super(struct super_block *s, void *data)
46 {
47         s->s_fs_info = data;
48         return set_anon_super(s, data);
49 }
50
51 /**
52  * v9fs_fill_super - populate superblock with info
53  * @sb: superblock
54  * @v9ses: session information
55  * @flags: flags propagated from v9fs_mount()
56  *
57  */
58
59 static int
60 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
61                 int flags)
62 {
63         int ret;
64
65         sb->s_maxbytes = MAX_LFS_FILESIZE;
66         sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
67         sb->s_blocksize = 1 << sb->s_blocksize_bits;
68         sb->s_magic = V9FS_MAGIC;
69         if (v9fs_proto_dotl(v9ses)) {
70                 sb->s_op = &v9fs_super_ops_dotl;
71                 sb->s_xattr = v9fs_xattr_handlers;
72         } else {
73                 sb->s_op = &v9fs_super_ops;
74                 sb->s_time_max = U32_MAX;
75         }
76
77         sb->s_time_min = 0;
78
79         ret = super_setup_bdi(sb);
80         if (ret)
81                 return ret;
82
83         if (!v9ses->cache) {
84                 sb->s_bdi->ra_pages = 0;
85                 sb->s_bdi->io_pages = 0;
86         }
87
88         sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
89         if (!v9ses->cache)
90                 sb->s_flags |= SB_SYNCHRONOUS;
91
92 #ifdef CONFIG_9P_FS_POSIX_ACL
93         if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
94                 sb->s_flags |= SB_POSIXACL;
95 #endif
96
97         return 0;
98 }
99
100 /**
101  * v9fs_mount - mount a superblock
102  * @fs_type: file system type
103  * @flags: mount flags
104  * @dev_name: device name that was mounted
105  * @data: mount options
106  *
107  */
108
109 static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
110                        const char *dev_name, void *data)
111 {
112         struct super_block *sb = NULL;
113         struct inode *inode = NULL;
114         struct dentry *root = NULL;
115         struct v9fs_session_info *v9ses = NULL;
116         umode_t mode = S_IRWXUGO | S_ISVTX;
117         struct p9_fid *fid;
118         int retval = 0;
119
120         p9_debug(P9_DEBUG_VFS, "\n");
121
122         v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
123         if (!v9ses)
124                 return ERR_PTR(-ENOMEM);
125
126         fid = v9fs_session_init(v9ses, dev_name, data);
127         if (IS_ERR(fid)) {
128                 retval = PTR_ERR(fid);
129                 goto free_session;
130         }
131
132         sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
133         if (IS_ERR(sb)) {
134                 retval = PTR_ERR(sb);
135                 goto clunk_fid;
136         }
137         retval = v9fs_fill_super(sb, v9ses, flags);
138         if (retval)
139                 goto release_sb;
140
141         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
142                 sb->s_d_op = &v9fs_cached_dentry_operations;
143         else
144                 sb->s_d_op = &v9fs_dentry_operations;
145
146         inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
147         if (IS_ERR(inode)) {
148                 retval = PTR_ERR(inode);
149                 goto release_sb;
150         }
151
152         root = d_make_root(inode);
153         if (!root) {
154                 retval = -ENOMEM;
155                 goto release_sb;
156         }
157         sb->s_root = root;
158         if (v9fs_proto_dotl(v9ses)) {
159                 struct p9_stat_dotl *st = NULL;
160                 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
161                 if (IS_ERR(st)) {
162                         retval = PTR_ERR(st);
163                         goto release_sb;
164                 }
165                 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
166                 v9fs_stat2inode_dotl(st, d_inode(root), 0);
167                 kfree(st);
168         } else {
169                 struct p9_wstat *st = NULL;
170                 st = p9_client_stat(fid);
171                 if (IS_ERR(st)) {
172                         retval = PTR_ERR(st);
173                         goto release_sb;
174                 }
175
176                 d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
177                 v9fs_stat2inode(st, d_inode(root), sb, 0);
178
179                 p9stat_free(st);
180                 kfree(st);
181         }
182         retval = v9fs_get_acl(inode, fid);
183         if (retval)
184                 goto release_sb;
185         v9fs_fid_add(root, fid);
186
187         p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
188         return dget(sb->s_root);
189
190 clunk_fid:
191         p9_client_clunk(fid);
192         v9fs_session_close(v9ses);
193 free_session:
194         kfree(v9ses);
195         return ERR_PTR(retval);
196
197 release_sb:
198         /*
199          * we will do the session_close and root dentry release
200          * in the below call. But we need to clunk fid, because we haven't
201          * attached the fid to dentry so it won't get clunked
202          * automatically.
203          */
204         p9_client_clunk(fid);
205         deactivate_locked_super(sb);
206         return ERR_PTR(retval);
207 }
208
209 /**
210  * v9fs_kill_super - Kill Superblock
211  * @s: superblock
212  *
213  */
214
215 static void v9fs_kill_super(struct super_block *s)
216 {
217         struct v9fs_session_info *v9ses = s->s_fs_info;
218
219         p9_debug(P9_DEBUG_VFS, " %p\n", s);
220
221         kill_anon_super(s);
222
223         v9fs_session_cancel(v9ses);
224         v9fs_session_close(v9ses);
225         kfree(v9ses);
226         s->s_fs_info = NULL;
227         p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
228 }
229
230 static void
231 v9fs_umount_begin(struct super_block *sb)
232 {
233         struct v9fs_session_info *v9ses;
234
235         v9ses = sb->s_fs_info;
236         v9fs_session_begin_cancel(v9ses);
237 }
238
239 static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
240 {
241         struct v9fs_session_info *v9ses;
242         struct p9_fid *fid;
243         struct p9_rstatfs rs;
244         int res;
245
246         fid = v9fs_fid_lookup(dentry);
247         if (IS_ERR(fid)) {
248                 res = PTR_ERR(fid);
249                 goto done;
250         }
251
252         v9ses = v9fs_dentry2v9ses(dentry);
253         if (v9fs_proto_dotl(v9ses)) {
254                 res = p9_client_statfs(fid, &rs);
255                 if (res == 0) {
256                         buf->f_type = rs.type;
257                         buf->f_bsize = rs.bsize;
258                         buf->f_blocks = rs.blocks;
259                         buf->f_bfree = rs.bfree;
260                         buf->f_bavail = rs.bavail;
261                         buf->f_files = rs.files;
262                         buf->f_ffree = rs.ffree;
263                         buf->f_fsid = u64_to_fsid(rs.fsid);
264                         buf->f_namelen = rs.namelen;
265                 }
266                 if (res != -ENOSYS)
267                         goto done;
268         }
269         res = simple_statfs(dentry, buf);
270 done:
271         p9_client_clunk(fid);
272         return res;
273 }
274
275 static int v9fs_drop_inode(struct inode *inode)
276 {
277         struct v9fs_session_info *v9ses;
278         v9ses = v9fs_inode2v9ses(inode);
279         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
280                 return generic_drop_inode(inode);
281         /*
282          * in case of non cached mode always drop the
283          * the inode because we want the inode attribute
284          * to always match that on the server.
285          */
286         return 1;
287 }
288
289 static int v9fs_write_inode(struct inode *inode,
290                             struct writeback_control *wbc)
291 {
292         int ret;
293         struct p9_wstat wstat;
294         struct v9fs_inode *v9inode;
295         /*
296          * send an fsync request to server irrespective of
297          * wbc->sync_mode.
298          */
299         p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
300         v9inode = V9FS_I(inode);
301         if (!v9inode->writeback_fid)
302                 return 0;
303         v9fs_blank_wstat(&wstat);
304
305         ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
306         if (ret < 0) {
307                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
308                 return ret;
309         }
310         return 0;
311 }
312
313 static int v9fs_write_inode_dotl(struct inode *inode,
314                                  struct writeback_control *wbc)
315 {
316         int ret;
317         struct v9fs_inode *v9inode;
318         /*
319          * send an fsync request to server irrespective of
320          * wbc->sync_mode.
321          */
322         v9inode = V9FS_I(inode);
323         p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
324                  __func__, inode, v9inode->writeback_fid);
325         if (!v9inode->writeback_fid)
326                 return 0;
327
328         ret = p9_client_fsync(v9inode->writeback_fid, 0);
329         if (ret < 0) {
330                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
331                 return ret;
332         }
333         return 0;
334 }
335
336 static const struct super_operations v9fs_super_ops = {
337         .alloc_inode = v9fs_alloc_inode,
338         .free_inode = v9fs_free_inode,
339         .statfs = simple_statfs,
340         .evict_inode = v9fs_evict_inode,
341         .show_options = v9fs_show_options,
342         .umount_begin = v9fs_umount_begin,
343         .write_inode = v9fs_write_inode,
344 };
345
346 static const struct super_operations v9fs_super_ops_dotl = {
347         .alloc_inode = v9fs_alloc_inode,
348         .free_inode = v9fs_free_inode,
349         .statfs = v9fs_statfs,
350         .drop_inode = v9fs_drop_inode,
351         .evict_inode = v9fs_evict_inode,
352         .show_options = v9fs_show_options,
353         .umount_begin = v9fs_umount_begin,
354         .write_inode = v9fs_write_inode_dotl,
355 };
356
357 struct file_system_type v9fs_fs_type = {
358         .name = "9p",
359         .mount = v9fs_mount,
360         .kill_sb = v9fs_kill_super,
361         .owner = THIS_MODULE,
362         .fs_flags = FS_RENAME_DOES_D_MOVE,
363 };
364 MODULE_ALIAS_FS("9p");