1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/fs/affs/inode.c |
4 | * |
5 | * (c) 1996 Hans-Joachim Widmaier - Rewritten |
6 | * |
7 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. |
8 | * |
9 | * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. |
10 | * |
11 | * (C) 1991 Linus Torvalds - minix filesystem |
12 | */ |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/init.h> |
16 | #include <linux/statfs.h> |
17 | #include <linux/parser.h> |
18 | #include <linux/magic.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/cred.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/writeback.h> |
23 | #include <linux/blkdev.h> |
24 | #include <linux/seq_file.h> |
25 | #include <linux/iversion.h> |
26 | #include "affs.h" |
27 | |
28 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
29 | static int affs_show_options(struct seq_file *m, struct dentry *root); |
30 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
31 | |
32 | static void |
33 | affs_commit_super(struct super_block *sb, int wait) |
34 | { |
35 | struct affs_sb_info *sbi = AFFS_SB(sb); |
36 | struct buffer_head *bh = sbi->s_root_bh; |
37 | struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); |
38 | |
39 | lock_buffer(bh); |
40 | affs_secs_to_datestamp(secs: ktime_get_real_seconds(), ds: &tail->disk_change); |
41 | affs_fix_checksum(sb, bh); |
42 | unlock_buffer(bh); |
43 | |
44 | mark_buffer_dirty(bh); |
45 | if (wait) |
46 | sync_dirty_buffer(bh); |
47 | } |
48 | |
49 | static void |
50 | affs_put_super(struct super_block *sb) |
51 | { |
52 | struct affs_sb_info *sbi = AFFS_SB(sb); |
53 | pr_debug("%s()\n" , __func__); |
54 | |
55 | cancel_delayed_work_sync(dwork: &sbi->sb_work); |
56 | } |
57 | |
58 | static int |
59 | affs_sync_fs(struct super_block *sb, int wait) |
60 | { |
61 | affs_commit_super(sb, wait); |
62 | return 0; |
63 | } |
64 | |
65 | static void flush_superblock(struct work_struct *work) |
66 | { |
67 | struct affs_sb_info *sbi; |
68 | struct super_block *sb; |
69 | |
70 | sbi = container_of(work, struct affs_sb_info, sb_work.work); |
71 | sb = sbi->sb; |
72 | |
73 | spin_lock(lock: &sbi->work_lock); |
74 | sbi->work_queued = 0; |
75 | spin_unlock(lock: &sbi->work_lock); |
76 | |
77 | affs_commit_super(sb, wait: 1); |
78 | } |
79 | |
80 | void affs_mark_sb_dirty(struct super_block *sb) |
81 | { |
82 | struct affs_sb_info *sbi = AFFS_SB(sb); |
83 | unsigned long delay; |
84 | |
85 | if (sb_rdonly(sb)) |
86 | return; |
87 | |
88 | spin_lock(lock: &sbi->work_lock); |
89 | if (!sbi->work_queued) { |
90 | delay = msecs_to_jiffies(m: dirty_writeback_interval * 10); |
91 | queue_delayed_work(wq: system_long_wq, dwork: &sbi->sb_work, delay); |
92 | sbi->work_queued = 1; |
93 | } |
94 | spin_unlock(lock: &sbi->work_lock); |
95 | } |
96 | |
97 | static struct kmem_cache * affs_inode_cachep; |
98 | |
99 | static struct inode *affs_alloc_inode(struct super_block *sb) |
100 | { |
101 | struct affs_inode_info *i; |
102 | |
103 | i = alloc_inode_sb(sb, cache: affs_inode_cachep, GFP_KERNEL); |
104 | if (!i) |
105 | return NULL; |
106 | |
107 | inode_set_iversion(inode: &i->vfs_inode, val: 1); |
108 | i->i_lc = NULL; |
109 | i->i_ext_bh = NULL; |
110 | i->i_pa_cnt = 0; |
111 | |
112 | return &i->vfs_inode; |
113 | } |
114 | |
115 | static void affs_free_inode(struct inode *inode) |
116 | { |
117 | kmem_cache_free(s: affs_inode_cachep, objp: AFFS_I(inode)); |
118 | } |
119 | |
120 | static void init_once(void *foo) |
121 | { |
122 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
123 | |
124 | mutex_init(&ei->i_link_lock); |
125 | mutex_init(&ei->i_ext_lock); |
126 | inode_init_once(&ei->vfs_inode); |
127 | } |
128 | |
129 | static int __init init_inodecache(void) |
130 | { |
131 | affs_inode_cachep = kmem_cache_create(name: "affs_inode_cache" , |
132 | size: sizeof(struct affs_inode_info), |
133 | align: 0, flags: (SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT), |
134 | ctor: init_once); |
135 | if (affs_inode_cachep == NULL) |
136 | return -ENOMEM; |
137 | return 0; |
138 | } |
139 | |
140 | static void destroy_inodecache(void) |
141 | { |
142 | /* |
143 | * Make sure all delayed rcu free inodes are flushed before we |
144 | * destroy cache. |
145 | */ |
146 | rcu_barrier(); |
147 | kmem_cache_destroy(s: affs_inode_cachep); |
148 | } |
149 | |
150 | static const struct super_operations affs_sops = { |
151 | .alloc_inode = affs_alloc_inode, |
152 | .free_inode = affs_free_inode, |
153 | .write_inode = affs_write_inode, |
154 | .evict_inode = affs_evict_inode, |
155 | .put_super = affs_put_super, |
156 | .sync_fs = affs_sync_fs, |
157 | .statfs = affs_statfs, |
158 | .remount_fs = affs_remount, |
159 | .show_options = affs_show_options, |
160 | }; |
161 | |
162 | enum { |
163 | Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, |
164 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
165 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
166 | }; |
167 | |
168 | static const match_table_t tokens = { |
169 | {Opt_bs, "bs=%u" }, |
170 | {Opt_mode, "mode=%o" }, |
171 | {Opt_mufs, "mufs" }, |
172 | {Opt_notruncate, "nofilenametruncate" }, |
173 | {Opt_prefix, "prefix=%s" }, |
174 | {Opt_protect, "protect" }, |
175 | {Opt_reserved, "reserved=%u" }, |
176 | {Opt_root, "root=%u" }, |
177 | {Opt_setgid, "setgid=%u" }, |
178 | {Opt_setuid, "setuid=%u" }, |
179 | {Opt_verbose, "verbose" }, |
180 | {Opt_volume, "volume=%s" }, |
181 | {Opt_ignore, "grpquota" }, |
182 | {Opt_ignore, "noquota" }, |
183 | {Opt_ignore, "quota" }, |
184 | {Opt_ignore, "usrquota" }, |
185 | {Opt_err, NULL}, |
186 | }; |
187 | |
188 | static int |
189 | parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, |
190 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
191 | { |
192 | char *p; |
193 | substring_t args[MAX_OPT_ARGS]; |
194 | |
195 | /* Fill in defaults */ |
196 | |
197 | *uid = current_uid(); |
198 | *gid = current_gid(); |
199 | *reserved = 2; |
200 | *root = -1; |
201 | *blocksize = -1; |
202 | volume[0] = ':'; |
203 | volume[1] = 0; |
204 | *mount_opts = 0; |
205 | if (!options) |
206 | return 1; |
207 | |
208 | while ((p = strsep(&options, "," )) != NULL) { |
209 | int token, n, option; |
210 | if (!*p) |
211 | continue; |
212 | |
213 | token = match_token(p, table: tokens, args); |
214 | switch (token) { |
215 | case Opt_bs: |
216 | if (match_int(&args[0], result: &n)) |
217 | return 0; |
218 | if (n != 512 && n != 1024 && n != 2048 |
219 | && n != 4096) { |
220 | pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n" ); |
221 | return 0; |
222 | } |
223 | *blocksize = n; |
224 | break; |
225 | case Opt_mode: |
226 | if (match_octal(&args[0], result: &option)) |
227 | return 0; |
228 | *mode = option & 0777; |
229 | affs_set_opt(*mount_opts, SF_SETMODE); |
230 | break; |
231 | case Opt_mufs: |
232 | affs_set_opt(*mount_opts, SF_MUFS); |
233 | break; |
234 | case Opt_notruncate: |
235 | affs_set_opt(*mount_opts, SF_NO_TRUNCATE); |
236 | break; |
237 | case Opt_prefix: |
238 | kfree(objp: *prefix); |
239 | *prefix = match_strdup(&args[0]); |
240 | if (!*prefix) |
241 | return 0; |
242 | affs_set_opt(*mount_opts, SF_PREFIX); |
243 | break; |
244 | case Opt_protect: |
245 | affs_set_opt(*mount_opts, SF_IMMUTABLE); |
246 | break; |
247 | case Opt_reserved: |
248 | if (match_int(&args[0], result: reserved)) |
249 | return 0; |
250 | break; |
251 | case Opt_root: |
252 | if (match_int(&args[0], result: root)) |
253 | return 0; |
254 | break; |
255 | case Opt_setgid: |
256 | if (match_int(&args[0], result: &option)) |
257 | return 0; |
258 | *gid = make_kgid(current_user_ns(), gid: option); |
259 | if (!gid_valid(gid: *gid)) |
260 | return 0; |
261 | affs_set_opt(*mount_opts, SF_SETGID); |
262 | break; |
263 | case Opt_setuid: |
264 | if (match_int(&args[0], result: &option)) |
265 | return 0; |
266 | *uid = make_kuid(current_user_ns(), uid: option); |
267 | if (!uid_valid(uid: *uid)) |
268 | return 0; |
269 | affs_set_opt(*mount_opts, SF_SETUID); |
270 | break; |
271 | case Opt_verbose: |
272 | affs_set_opt(*mount_opts, SF_VERBOSE); |
273 | break; |
274 | case Opt_volume: { |
275 | char *vol = match_strdup(&args[0]); |
276 | if (!vol) |
277 | return 0; |
278 | strscpy(volume, vol, 32); |
279 | kfree(objp: vol); |
280 | break; |
281 | } |
282 | case Opt_ignore: |
283 | /* Silently ignore the quota options */ |
284 | break; |
285 | default: |
286 | pr_warn("Unrecognized mount option \"%s\" or missing value\n" , |
287 | p); |
288 | return 0; |
289 | } |
290 | } |
291 | return 1; |
292 | } |
293 | |
294 | static int affs_show_options(struct seq_file *m, struct dentry *root) |
295 | { |
296 | struct super_block *sb = root->d_sb; |
297 | struct affs_sb_info *sbi = AFFS_SB(sb); |
298 | |
299 | if (sb->s_blocksize) |
300 | seq_printf(m, fmt: ",bs=%lu" , sb->s_blocksize); |
301 | if (affs_test_opt(sbi->s_flags, SF_SETMODE)) |
302 | seq_printf(m, fmt: ",mode=%o" , sbi->s_mode); |
303 | if (affs_test_opt(sbi->s_flags, SF_MUFS)) |
304 | seq_puts(m, s: ",mufs" ); |
305 | if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE)) |
306 | seq_puts(m, s: ",nofilenametruncate" ); |
307 | if (affs_test_opt(sbi->s_flags, SF_PREFIX)) |
308 | seq_printf(m, fmt: ",prefix=%s" , sbi->s_prefix); |
309 | if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE)) |
310 | seq_puts(m, s: ",protect" ); |
311 | if (sbi->s_reserved != 2) |
312 | seq_printf(m, fmt: ",reserved=%u" , sbi->s_reserved); |
313 | if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2) |
314 | seq_printf(m, fmt: ",root=%u" , sbi->s_root_block); |
315 | if (affs_test_opt(sbi->s_flags, SF_SETGID)) |
316 | seq_printf(m, fmt: ",setgid=%u" , |
317 | from_kgid_munged(to: &init_user_ns, gid: sbi->s_gid)); |
318 | if (affs_test_opt(sbi->s_flags, SF_SETUID)) |
319 | seq_printf(m, fmt: ",setuid=%u" , |
320 | from_kuid_munged(to: &init_user_ns, uid: sbi->s_uid)); |
321 | if (affs_test_opt(sbi->s_flags, SF_VERBOSE)) |
322 | seq_puts(m, s: ",verbose" ); |
323 | if (sbi->s_volume[0]) |
324 | seq_printf(m, fmt: ",volume=%s" , sbi->s_volume); |
325 | return 0; |
326 | } |
327 | |
328 | /* This function definitely needs to be split up. Some fine day I'll |
329 | * hopefully have the guts to do so. Until then: sorry for the mess. |
330 | */ |
331 | |
332 | static int affs_fill_super(struct super_block *sb, void *data, int silent) |
333 | { |
334 | struct affs_sb_info *sbi; |
335 | struct buffer_head *root_bh = NULL; |
336 | struct buffer_head *boot_bh; |
337 | struct inode *root_inode = NULL; |
338 | s32 root_block; |
339 | int size, blocksize; |
340 | u32 chksum; |
341 | int num_bm; |
342 | int i, j; |
343 | kuid_t uid; |
344 | kgid_t gid; |
345 | int reserved; |
346 | unsigned long mount_flags; |
347 | int tmp_flags; /* fix remount prototype... */ |
348 | u8 sig[4]; |
349 | int ret; |
350 | |
351 | pr_debug("read_super(%s)\n" , data ? (const char *)data : "no options" ); |
352 | |
353 | sb->s_magic = AFFS_SUPER_MAGIC; |
354 | sb->s_op = &affs_sops; |
355 | sb->s_flags |= SB_NODIRATIME; |
356 | |
357 | sb->s_time_gran = NSEC_PER_SEC; |
358 | sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA; |
359 | sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min; |
360 | |
361 | sbi = kzalloc(size: sizeof(struct affs_sb_info), GFP_KERNEL); |
362 | if (!sbi) |
363 | return -ENOMEM; |
364 | |
365 | sb->s_fs_info = sbi; |
366 | sbi->sb = sb; |
367 | mutex_init(&sbi->s_bmlock); |
368 | spin_lock_init(&sbi->symlink_lock); |
369 | spin_lock_init(&sbi->work_lock); |
370 | INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); |
371 | |
372 | if (!parse_options(options: data,uid: &uid,gid: &gid,mode: &i,reserved: &reserved,root: &root_block, |
373 | blocksize: &blocksize,prefix: &sbi->s_prefix, |
374 | volume: sbi->s_volume, mount_opts: &mount_flags)) { |
375 | pr_err("Error parsing options\n" ); |
376 | return -EINVAL; |
377 | } |
378 | /* N.B. after this point s_prefix must be released */ |
379 | |
380 | sbi->s_flags = mount_flags; |
381 | sbi->s_mode = i; |
382 | sbi->s_uid = uid; |
383 | sbi->s_gid = gid; |
384 | sbi->s_reserved= reserved; |
385 | |
386 | /* Get the size of the device in 512-byte blocks. |
387 | * If we later see that the partition uses bigger |
388 | * blocks, we will have to change it. |
389 | */ |
390 | |
391 | size = bdev_nr_sectors(bdev: sb->s_bdev); |
392 | pr_debug("initial blocksize=%d, #blocks=%d\n" , 512, size); |
393 | |
394 | affs_set_blocksize(sb, PAGE_SIZE); |
395 | /* Try to find root block. Its location depends on the block size. */ |
396 | |
397 | i = bdev_logical_block_size(bdev: sb->s_bdev); |
398 | j = PAGE_SIZE; |
399 | if (blocksize > 0) { |
400 | i = j = blocksize; |
401 | size = size / (blocksize / 512); |
402 | } |
403 | |
404 | for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) { |
405 | sbi->s_root_block = root_block; |
406 | if (root_block < 0) |
407 | sbi->s_root_block = (reserved + size - 1) / 2; |
408 | pr_debug("setting blocksize to %d\n" , blocksize); |
409 | affs_set_blocksize(sb, size: blocksize); |
410 | sbi->s_partition_size = size; |
411 | |
412 | /* The root block location that was calculated above is not |
413 | * correct if the partition size is an odd number of 512- |
414 | * byte blocks, which will be rounded down to a number of |
415 | * 1024-byte blocks, and if there were an even number of |
416 | * reserved blocks. Ideally, all partition checkers should |
417 | * report the real number of blocks of the real blocksize, |
418 | * but since this just cannot be done, we have to try to |
419 | * find the root block anyways. In the above case, it is one |
420 | * block behind the calculated one. So we check this one, too. |
421 | */ |
422 | for (num_bm = 0; num_bm < 2; num_bm++) { |
423 | pr_debug("Dev %s, trying root=%u, bs=%d, " |
424 | "size=%d, reserved=%d\n" , |
425 | sb->s_id, |
426 | sbi->s_root_block + num_bm, |
427 | blocksize, size, reserved); |
428 | root_bh = affs_bread(sb, block: sbi->s_root_block + num_bm); |
429 | if (!root_bh) |
430 | continue; |
431 | if (!affs_checksum_block(sb, bh: root_bh) && |
432 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
433 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
434 | sbi->s_hashsize = blocksize / 4 - 56; |
435 | sbi->s_root_block += num_bm; |
436 | goto got_root; |
437 | } |
438 | affs_brelse(bh: root_bh); |
439 | root_bh = NULL; |
440 | } |
441 | } |
442 | if (!silent) |
443 | pr_err("No valid root block on device %s\n" , sb->s_id); |
444 | return -EINVAL; |
445 | |
446 | /* N.B. after this point bh must be released */ |
447 | got_root: |
448 | /* Keep super block in cache */ |
449 | sbi->s_root_bh = root_bh; |
450 | root_block = sbi->s_root_block; |
451 | |
452 | /* Find out which kind of FS we have */ |
453 | boot_bh = sb_bread(sb, block: 0); |
454 | if (!boot_bh) { |
455 | pr_err("Cannot read boot block\n" ); |
456 | return -EINVAL; |
457 | } |
458 | memcpy(sig, boot_bh->b_data, 4); |
459 | brelse(bh: boot_bh); |
460 | chksum = be32_to_cpu(*(__be32 *)sig); |
461 | |
462 | /* Dircache filesystems are compatible with non-dircache ones |
463 | * when reading. As long as they aren't supported, writing is |
464 | * not recommended. |
465 | */ |
466 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
467 | || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) { |
468 | pr_notice("Dircache FS - mounting %s read only\n" , sb->s_id); |
469 | sb->s_flags |= SB_RDONLY; |
470 | } |
471 | switch (chksum) { |
472 | case MUFS_FS: |
473 | case MUFS_INTLFFS: |
474 | case MUFS_DCFFS: |
475 | affs_set_opt(sbi->s_flags, SF_MUFS); |
476 | fallthrough; |
477 | case FS_INTLFFS: |
478 | case FS_DCFFS: |
479 | affs_set_opt(sbi->s_flags, SF_INTL); |
480 | break; |
481 | case MUFS_FFS: |
482 | affs_set_opt(sbi->s_flags, SF_MUFS); |
483 | break; |
484 | case FS_FFS: |
485 | break; |
486 | case MUFS_OFS: |
487 | affs_set_opt(sbi->s_flags, SF_MUFS); |
488 | fallthrough; |
489 | case FS_OFS: |
490 | affs_set_opt(sbi->s_flags, SF_OFS); |
491 | sb->s_flags |= SB_NOEXEC; |
492 | break; |
493 | case MUFS_DCOFS: |
494 | case MUFS_INTLOFS: |
495 | affs_set_opt(sbi->s_flags, SF_MUFS); |
496 | fallthrough; |
497 | case FS_DCOFS: |
498 | case FS_INTLOFS: |
499 | affs_set_opt(sbi->s_flags, SF_INTL); |
500 | affs_set_opt(sbi->s_flags, SF_OFS); |
501 | sb->s_flags |= SB_NOEXEC; |
502 | break; |
503 | default: |
504 | pr_err("Unknown filesystem on device %s: %08X\n" , |
505 | sb->s_id, chksum); |
506 | return -EINVAL; |
507 | } |
508 | |
509 | if (affs_test_opt(mount_flags, SF_VERBOSE)) { |
510 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
511 | pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n" , |
512 | len > 31 ? 31 : len, |
513 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
514 | sig, sig[3] + '0', blocksize); |
515 | } |
516 | |
517 | sb->s_flags |= SB_NODEV | SB_NOSUID; |
518 | |
519 | sbi->s_data_blksize = sb->s_blocksize; |
520 | if (affs_test_opt(sbi->s_flags, SF_OFS)) |
521 | sbi->s_data_blksize -= 24; |
522 | |
523 | tmp_flags = sb->s_flags; |
524 | ret = affs_init_bitmap(sb, flags: &tmp_flags); |
525 | if (ret) |
526 | return ret; |
527 | sb->s_flags = tmp_flags; |
528 | |
529 | /* set up enough so that it can read an inode */ |
530 | |
531 | root_inode = affs_iget(sb, ino: root_block); |
532 | if (IS_ERR(ptr: root_inode)) |
533 | return PTR_ERR(ptr: root_inode); |
534 | |
535 | if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL)) |
536 | sb->s_d_op = &affs_intl_dentry_operations; |
537 | else |
538 | sb->s_d_op = &affs_dentry_operations; |
539 | |
540 | sb->s_root = d_make_root(root_inode); |
541 | if (!sb->s_root) { |
542 | pr_err("AFFS: Get root inode failed\n" ); |
543 | return -ENOMEM; |
544 | } |
545 | |
546 | sb->s_export_op = &affs_export_ops; |
547 | pr_debug("s_flags=%lX\n" , sb->s_flags); |
548 | return 0; |
549 | } |
550 | |
551 | static int |
552 | affs_remount(struct super_block *sb, int *flags, char *data) |
553 | { |
554 | struct affs_sb_info *sbi = AFFS_SB(sb); |
555 | int blocksize; |
556 | kuid_t uid; |
557 | kgid_t gid; |
558 | int mode; |
559 | int reserved; |
560 | int root_block; |
561 | unsigned long mount_flags; |
562 | int res = 0; |
563 | char volume[32]; |
564 | char *prefix = NULL; |
565 | |
566 | pr_debug("%s(flags=0x%x,opts=\"%s\")\n" , __func__, *flags, data); |
567 | |
568 | sync_filesystem(sb); |
569 | *flags |= SB_NODIRATIME; |
570 | |
571 | memcpy(volume, sbi->s_volume, 32); |
572 | if (!parse_options(options: data, uid: &uid, gid: &gid, mode: &mode, reserved: &reserved, root: &root_block, |
573 | blocksize: &blocksize, prefix: &prefix, volume, |
574 | mount_opts: &mount_flags)) { |
575 | kfree(objp: prefix); |
576 | return -EINVAL; |
577 | } |
578 | |
579 | flush_delayed_work(dwork: &sbi->sb_work); |
580 | |
581 | sbi->s_flags = mount_flags; |
582 | sbi->s_mode = mode; |
583 | sbi->s_uid = uid; |
584 | sbi->s_gid = gid; |
585 | /* protect against readers */ |
586 | spin_lock(lock: &sbi->symlink_lock); |
587 | if (prefix) { |
588 | kfree(objp: sbi->s_prefix); |
589 | sbi->s_prefix = prefix; |
590 | } |
591 | memcpy(sbi->s_volume, volume, 32); |
592 | spin_unlock(lock: &sbi->symlink_lock); |
593 | |
594 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
595 | return 0; |
596 | |
597 | if (*flags & SB_RDONLY) |
598 | affs_free_bitmap(sb); |
599 | else |
600 | res = affs_init_bitmap(sb, flags); |
601 | |
602 | return res; |
603 | } |
604 | |
605 | static int |
606 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
607 | { |
608 | struct super_block *sb = dentry->d_sb; |
609 | int free; |
610 | u64 id = huge_encode_dev(dev: sb->s_bdev->bd_dev); |
611 | |
612 | pr_debug("%s() partsize=%d, reserved=%d\n" , |
613 | __func__, AFFS_SB(sb)->s_partition_size, |
614 | AFFS_SB(sb)->s_reserved); |
615 | |
616 | free = affs_count_free_blocks(s: sb); |
617 | buf->f_type = AFFS_SUPER_MAGIC; |
618 | buf->f_bsize = sb->s_blocksize; |
619 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
620 | buf->f_bfree = free; |
621 | buf->f_bavail = free; |
622 | buf->f_fsid = u64_to_fsid(v: id); |
623 | buf->f_namelen = AFFSNAMEMAX; |
624 | return 0; |
625 | } |
626 | |
627 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
628 | int flags, const char *dev_name, void *data) |
629 | { |
630 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: affs_fill_super); |
631 | } |
632 | |
633 | static void affs_kill_sb(struct super_block *sb) |
634 | { |
635 | struct affs_sb_info *sbi = AFFS_SB(sb); |
636 | kill_block_super(sb); |
637 | if (sbi) { |
638 | affs_free_bitmap(sb); |
639 | affs_brelse(bh: sbi->s_root_bh); |
640 | kfree(objp: sbi->s_prefix); |
641 | mutex_destroy(lock: &sbi->s_bmlock); |
642 | kfree_rcu(sbi, rcu); |
643 | } |
644 | } |
645 | |
646 | static struct file_system_type affs_fs_type = { |
647 | .owner = THIS_MODULE, |
648 | .name = "affs" , |
649 | .mount = affs_mount, |
650 | .kill_sb = affs_kill_sb, |
651 | .fs_flags = FS_REQUIRES_DEV, |
652 | }; |
653 | MODULE_ALIAS_FS("affs" ); |
654 | |
655 | static int __init init_affs_fs(void) |
656 | { |
657 | int err = init_inodecache(); |
658 | if (err) |
659 | goto out1; |
660 | err = register_filesystem(&affs_fs_type); |
661 | if (err) |
662 | goto out; |
663 | return 0; |
664 | out: |
665 | destroy_inodecache(); |
666 | out1: |
667 | return err; |
668 | } |
669 | |
670 | static void __exit exit_affs_fs(void) |
671 | { |
672 | unregister_filesystem(&affs_fs_type); |
673 | destroy_inodecache(); |
674 | } |
675 | |
676 | MODULE_DESCRIPTION("Amiga filesystem support for Linux" ); |
677 | MODULE_LICENSE("GPL" ); |
678 | |
679 | module_init(init_affs_fs) |
680 | module_exit(exit_affs_fs) |
681 | |