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Linux/fs/hfs/super.c

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  1 /*
  2  *  linux/fs/hfs/super.c
  3  *
  4  * Copyright (C) 1995-1997  Paul H. Hargrove
  5  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  6  * This file may be distributed under the terms of the GNU General Public License.
  7  *
  8  * This file contains hfs_read_super(), some of the super_ops and
  9  * init_hfs_fs() and exit_hfs_fs().  The remaining super_ops are in
 10  * inode.c since they deal with inodes.
 11  *
 12  * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/blkdev.h>
 17 #include <linux/mount.h>
 18 #include <linux/init.h>
 19 #include <linux/nls.h>
 20 #include <linux/parser.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/slab.h>
 23 #include <linux/vfs.h>
 24 
 25 #include "hfs_fs.h"
 26 #include "btree.h"
 27 
 28 static struct kmem_cache *hfs_inode_cachep;
 29 
 30 MODULE_LICENSE("GPL");
 31 
 32 static int hfs_sync_fs(struct super_block *sb, int wait)
 33 {
 34         hfs_mdb_commit(sb);
 35         return 0;
 36 }
 37 
 38 /*
 39  * hfs_put_super()
 40  *
 41  * This is the put_super() entry in the super_operations structure for
 42  * HFS filesystems.  The purpose is to release the resources
 43  * associated with the superblock sb.
 44  */
 45 static void hfs_put_super(struct super_block *sb)
 46 {
 47         cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work);
 48         hfs_mdb_close(sb);
 49         /* release the MDB's resources */
 50         hfs_mdb_put(sb);
 51 }
 52 
 53 static void flush_mdb(struct work_struct *work)
 54 {
 55         struct hfs_sb_info *sbi;
 56         struct super_block *sb;
 57 
 58         sbi = container_of(work, struct hfs_sb_info, mdb_work.work);
 59         sb = sbi->sb;
 60 
 61         spin_lock(&sbi->work_lock);
 62         sbi->work_queued = 0;
 63         spin_unlock(&sbi->work_lock);
 64 
 65         hfs_mdb_commit(sb);
 66 }
 67 
 68 void hfs_mark_mdb_dirty(struct super_block *sb)
 69 {
 70         struct hfs_sb_info *sbi = HFS_SB(sb);
 71         unsigned long delay;
 72 
 73         if (sb->s_flags & MS_RDONLY)
 74                 return;
 75 
 76         spin_lock(&sbi->work_lock);
 77         if (!sbi->work_queued) {
 78                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 79                 queue_delayed_work(system_long_wq, &sbi->mdb_work, delay);
 80                 sbi->work_queued = 1;
 81         }
 82         spin_unlock(&sbi->work_lock);
 83 }
 84 
 85 /*
 86  * hfs_statfs()
 87  *
 88  * This is the statfs() entry in the super_operations structure for
 89  * HFS filesystems.  The purpose is to return various data about the
 90  * filesystem.
 91  *
 92  * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
 93  */
 94 static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 95 {
 96         struct super_block *sb = dentry->d_sb;
 97         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 98 
 99         buf->f_type = HFS_SUPER_MAGIC;
100         buf->f_bsize = sb->s_blocksize;
101         buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
102         buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
103         buf->f_bavail = buf->f_bfree;
104         buf->f_files = HFS_SB(sb)->fs_ablocks;
105         buf->f_ffree = HFS_SB(sb)->free_ablocks;
106         buf->f_fsid.val[0] = (u32)id;
107         buf->f_fsid.val[1] = (u32)(id >> 32);
108         buf->f_namelen = HFS_NAMELEN;
109 
110         return 0;
111 }
112 
113 static int hfs_remount(struct super_block *sb, int *flags, char *data)
114 {
115         *flags |= MS_NODIRATIME;
116         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
117                 return 0;
118         if (!(*flags & MS_RDONLY)) {
119                 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
120                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended.  leaving read-only.\n");
121                         sb->s_flags |= MS_RDONLY;
122                         *flags |= MS_RDONLY;
123                 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
124                         pr_warn("filesystem is marked locked, leaving read-only.\n");
125                         sb->s_flags |= MS_RDONLY;
126                         *flags |= MS_RDONLY;
127                 }
128         }
129         return 0;
130 }
131 
132 static int hfs_show_options(struct seq_file *seq, struct dentry *root)
133 {
134         struct hfs_sb_info *sbi = HFS_SB(root->d_sb);
135 
136         if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
137                 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
138         if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
139                 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
140         seq_printf(seq, ",uid=%u,gid=%u",
141                         from_kuid_munged(&init_user_ns, sbi->s_uid),
142                         from_kgid_munged(&init_user_ns, sbi->s_gid));
143         if (sbi->s_file_umask != 0133)
144                 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
145         if (sbi->s_dir_umask != 0022)
146                 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
147         if (sbi->part >= 0)
148                 seq_printf(seq, ",part=%u", sbi->part);
149         if (sbi->session >= 0)
150                 seq_printf(seq, ",session=%u", sbi->session);
151         if (sbi->nls_disk)
152                 seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
153         if (sbi->nls_io)
154                 seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
155         if (sbi->s_quiet)
156                 seq_printf(seq, ",quiet");
157         return 0;
158 }
159 
160 static struct inode *hfs_alloc_inode(struct super_block *sb)
161 {
162         struct hfs_inode_info *i;
163 
164         i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
165         return i ? &i->vfs_inode : NULL;
166 }
167 
168 static void hfs_i_callback(struct rcu_head *head)
169 {
170         struct inode *inode = container_of(head, struct inode, i_rcu);
171         kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
172 }
173 
174 static void hfs_destroy_inode(struct inode *inode)
175 {
176         call_rcu(&inode->i_rcu, hfs_i_callback);
177 }
178 
179 static const struct super_operations hfs_super_operations = {
180         .alloc_inode    = hfs_alloc_inode,
181         .destroy_inode  = hfs_destroy_inode,
182         .write_inode    = hfs_write_inode,
183         .evict_inode    = hfs_evict_inode,
184         .put_super      = hfs_put_super,
185         .sync_fs        = hfs_sync_fs,
186         .statfs         = hfs_statfs,
187         .remount_fs     = hfs_remount,
188         .show_options   = hfs_show_options,
189 };
190 
191 enum {
192         opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
193         opt_part, opt_session, opt_type, opt_creator, opt_quiet,
194         opt_codepage, opt_iocharset,
195         opt_err
196 };
197 
198 static const match_table_t tokens = {
199         { opt_uid, "uid=%u" },
200         { opt_gid, "gid=%u" },
201         { opt_umask, "umask=%o" },
202         { opt_file_umask, "file_umask=%o" },
203         { opt_dir_umask, "dir_umask=%o" },
204         { opt_part, "part=%u" },
205         { opt_session, "session=%u" },
206         { opt_type, "type=%s" },
207         { opt_creator, "creator=%s" },
208         { opt_quiet, "quiet" },
209         { opt_codepage, "codepage=%s" },
210         { opt_iocharset, "iocharset=%s" },
211         { opt_err, NULL }
212 };
213 
214 static inline int match_fourchar(substring_t *arg, u32 *result)
215 {
216         if (arg->to - arg->from != 4)
217                 return -EINVAL;
218         memcpy(result, arg->from, 4);
219         return 0;
220 }
221 
222 /*
223  * parse_options()
224  *
225  * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
226  * This function is called by hfs_read_super() to parse the mount options.
227  */
228 static int parse_options(char *options, struct hfs_sb_info *hsb)
229 {
230         char *p;
231         substring_t args[MAX_OPT_ARGS];
232         int tmp, token;
233 
234         /* initialize the sb with defaults */
235         hsb->s_uid = current_uid();
236         hsb->s_gid = current_gid();
237         hsb->s_file_umask = 0133;
238         hsb->s_dir_umask = 0022;
239         hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
240         hsb->s_quiet = 0;
241         hsb->part = -1;
242         hsb->session = -1;
243 
244         if (!options)
245                 return 1;
246 
247         while ((p = strsep(&options, ",")) != NULL) {
248                 if (!*p)
249                         continue;
250 
251                 token = match_token(p, tokens, args);
252                 switch (token) {
253                 case opt_uid:
254                         if (match_int(&args[0], &tmp)) {
255                                 pr_err("uid requires an argument\n");
256                                 return 0;
257                         }
258                         hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp);
259                         if (!uid_valid(hsb->s_uid)) {
260                                 pr_err("invalid uid %d\n", tmp);
261                                 return 0;
262                         }
263                         break;
264                 case opt_gid:
265                         if (match_int(&args[0], &tmp)) {
266                                 pr_err("gid requires an argument\n");
267                                 return 0;
268                         }
269                         hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp);
270                         if (!gid_valid(hsb->s_gid)) {
271                                 pr_err("invalid gid %d\n", tmp);
272                                 return 0;
273                         }
274                         break;
275                 case opt_umask:
276                         if (match_octal(&args[0], &tmp)) {
277                                 pr_err("umask requires a value\n");
278                                 return 0;
279                         }
280                         hsb->s_file_umask = (umode_t)tmp;
281                         hsb->s_dir_umask = (umode_t)tmp;
282                         break;
283                 case opt_file_umask:
284                         if (match_octal(&args[0], &tmp)) {
285                                 pr_err("file_umask requires a value\n");
286                                 return 0;
287                         }
288                         hsb->s_file_umask = (umode_t)tmp;
289                         break;
290                 case opt_dir_umask:
291                         if (match_octal(&args[0], &tmp)) {
292                                 pr_err("dir_umask requires a value\n");
293                                 return 0;
294                         }
295                         hsb->s_dir_umask = (umode_t)tmp;
296                         break;
297                 case opt_part:
298                         if (match_int(&args[0], &hsb->part)) {
299                                 pr_err("part requires an argument\n");
300                                 return 0;
301                         }
302                         break;
303                 case opt_session:
304                         if (match_int(&args[0], &hsb->session)) {
305                                 pr_err("session requires an argument\n");
306                                 return 0;
307                         }
308                         break;
309                 case opt_type:
310                         if (match_fourchar(&args[0], &hsb->s_type)) {
311                                 pr_err("type requires a 4 character value\n");
312                                 return 0;
313                         }
314                         break;
315                 case opt_creator:
316                         if (match_fourchar(&args[0], &hsb->s_creator)) {
317                                 pr_err("creator requires a 4 character value\n");
318                                 return 0;
319                         }
320                         break;
321                 case opt_quiet:
322                         hsb->s_quiet = 1;
323                         break;
324                 case opt_codepage:
325                         if (hsb->nls_disk) {
326                                 pr_err("unable to change codepage\n");
327                                 return 0;
328                         }
329                         p = match_strdup(&args[0]);
330                         if (p)
331                                 hsb->nls_disk = load_nls(p);
332                         if (!hsb->nls_disk) {
333                                 pr_err("unable to load codepage \"%s\"\n", p);
334                                 kfree(p);
335                                 return 0;
336                         }
337                         kfree(p);
338                         break;
339                 case opt_iocharset:
340                         if (hsb->nls_io) {
341                                 pr_err("unable to change iocharset\n");
342                                 return 0;
343                         }
344                         p = match_strdup(&args[0]);
345                         if (p)
346                                 hsb->nls_io = load_nls(p);
347                         if (!hsb->nls_io) {
348                                 pr_err("unable to load iocharset \"%s\"\n", p);
349                                 kfree(p);
350                                 return 0;
351                         }
352                         kfree(p);
353                         break;
354                 default:
355                         return 0;
356                 }
357         }
358 
359         if (hsb->nls_disk && !hsb->nls_io) {
360                 hsb->nls_io = load_nls_default();
361                 if (!hsb->nls_io) {
362                         pr_err("unable to load default iocharset\n");
363                         return 0;
364                 }
365         }
366         hsb->s_dir_umask &= 0777;
367         hsb->s_file_umask &= 0577;
368 
369         return 1;
370 }
371 
372 /*
373  * hfs_read_super()
374  *
375  * This is the function that is responsible for mounting an HFS
376  * filesystem.  It performs all the tasks necessary to get enough data
377  * from the disk to read the root inode.  This includes parsing the
378  * mount options, dealing with Macintosh partitions, reading the
379  * superblock and the allocation bitmap blocks, calling
380  * hfs_btree_init() to get the necessary data about the extents and
381  * catalog B-trees and, finally, reading the root inode into memory.
382  */
383 static int hfs_fill_super(struct super_block *sb, void *data, int silent)
384 {
385         struct hfs_sb_info *sbi;
386         struct hfs_find_data fd;
387         hfs_cat_rec rec;
388         struct inode *root_inode;
389         int res;
390 
391         sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
392         if (!sbi)
393                 return -ENOMEM;
394 
395         sbi->sb = sb;
396         sb->s_fs_info = sbi;
397         spin_lock_init(&sbi->work_lock);
398         INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb);
399 
400         res = -EINVAL;
401         if (!parse_options((char *)data, sbi)) {
402                 pr_err("unable to parse mount options\n");
403                 goto bail;
404         }
405 
406         sb->s_op = &hfs_super_operations;
407         sb->s_flags |= MS_NODIRATIME;
408         mutex_init(&sbi->bitmap_lock);
409 
410         res = hfs_mdb_get(sb);
411         if (res) {
412                 if (!silent)
413                         pr_warn("can't find a HFS filesystem on dev %s\n",
414                                 hfs_mdb_name(sb));
415                 res = -EINVAL;
416                 goto bail;
417         }
418 
419         /* try to get the root inode */
420         res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
421         if (res)
422                 goto bail_no_root;
423         res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
424         if (!res) {
425                 if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
426                         res =  -EIO;
427                         goto bail;
428                 }
429                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
430         }
431         if (res) {
432                 hfs_find_exit(&fd);
433                 goto bail_no_root;
434         }
435         res = -EINVAL;
436         root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
437         hfs_find_exit(&fd);
438         if (!root_inode)
439                 goto bail_no_root;
440 
441         sb->s_d_op = &hfs_dentry_operations;
442         res = -ENOMEM;
443         sb->s_root = d_make_root(root_inode);
444         if (!sb->s_root)
445                 goto bail_no_root;
446 
447         /* everything's okay */
448         return 0;
449 
450 bail_no_root:
451         pr_err("get root inode failed\n");
452 bail:
453         hfs_mdb_put(sb);
454         return res;
455 }
456 
457 static struct dentry *hfs_mount(struct file_system_type *fs_type,
458                       int flags, const char *dev_name, void *data)
459 {
460         return mount_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
461 }
462 
463 static struct file_system_type hfs_fs_type = {
464         .owner          = THIS_MODULE,
465         .name           = "hfs",
466         .mount          = hfs_mount,
467         .kill_sb        = kill_block_super,
468         .fs_flags       = FS_REQUIRES_DEV,
469 };
470 MODULE_ALIAS_FS("hfs");
471 
472 static void hfs_init_once(void *p)
473 {
474         struct hfs_inode_info *i = p;
475 
476         inode_init_once(&i->vfs_inode);
477 }
478 
479 static int __init init_hfs_fs(void)
480 {
481         int err;
482 
483         hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
484                 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
485                 hfs_init_once);
486         if (!hfs_inode_cachep)
487                 return -ENOMEM;
488         err = register_filesystem(&hfs_fs_type);
489         if (err)
490                 kmem_cache_destroy(hfs_inode_cachep);
491         return err;
492 }
493 
494 static void __exit exit_hfs_fs(void)
495 {
496         unregister_filesystem(&hfs_fs_type);
497 
498         /*
499          * Make sure all delayed rcu free inodes are flushed before we
500          * destroy cache.
501          */
502         rcu_barrier();
503         kmem_cache_destroy(hfs_inode_cachep);
504 }
505 
506 module_init(init_hfs_fs)
507 module_exit(exit_hfs_fs)
508 

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