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Linux/fs/9p/vfs_super.c

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  1 /*
  2  *  linux/fs/9p/vfs_super.c
  3  *
  4  * This file contians superblock ops for 9P2000. It is intended that
  5  * you mount this file system on directories.
  6  *
  7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  9  *
 10  *  This program is free software; you can redistribute it and/or modify
 11  *  it under the terms of the GNU General Public License version 2
 12  *  as published by the Free Software Foundation.
 13  *
 14  *  This program is distributed in the hope that it will be useful,
 15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  *  GNU General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License
 20  *  along with this program; if not, write to:
 21  *  Free Software Foundation
 22  *  51 Franklin Street, Fifth Floor
 23  *  Boston, MA  02111-1301  USA
 24  *
 25  */
 26 
 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 
 52 static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
 53 
 54 /**
 55  * v9fs_set_super - set the superblock
 56  * @s: super block
 57  * @data: file system specific data
 58  *
 59  */
 60 
 61 static 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  * v9fs_fill_super - populate superblock with info
 69  * @sb: superblock
 70  * @v9ses: session information
 71  * @flags: flags propagated from v9fs_mount()
 72  *
 73  */
 74 
 75 static void
 76 v9fs_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_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  * v9fs_mount - mount a superblock
106  * @fs_type: file system type
107  * @flags: mount flags
108  * @dev_name: device name that was mounted
109  * @data: mount options
110  *
111  */
112 
113 static 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 
192 clunk_fid:
193         p9_client_clunk(fid);
194         v9fs_session_close(v9ses);
195 free_session:
196         kfree(v9ses);
197         return ERR_PTR(retval);
198 
199 release_sb:
200         /*
201          * we will do the session_close and root dentry release
202          * in the below call. But we need to clunk fid, because we haven't
203          * attached the fid to dentry so it won't get clunked
204          * automatically.
205          */
206         p9_client_clunk(fid);
207         deactivate_locked_super(sb);
208         return ERR_PTR(retval);
209 }
210 
211 /**
212  * v9fs_kill_super - Kill Superblock
213  * @s: superblock
214  *
215  */
216 
217 static 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 
232 static void
233 v9fs_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 
241 static 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);
273 done:
274         return res;
275 }
276 
277 static 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          * in case of non cached mode always drop the
285          * the inode because we want the inode attribute
286          * to always match that on the server.
287          */
288         return 1;
289 }
290 
291 static 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          * send an fsync request to server irrespective of
299          * wbc->sync_mode.
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 
315 static int v9fs_write_inode_dotl(struct inode *inode,
316                                  struct writeback_control *wbc)
317 {
318         int ret;
319         struct v9fs_inode *v9inode;
320         /*
321          * send an fsync request to server irrespective of
322          * wbc->sync_mode.
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 
338 static 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 
348 static 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 
359 struct 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 };
366 MODULE_ALIAS_FS("9p");
367 

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