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| |
134 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
135 | ctor: init_once); |
136 | if (affs_inode_cachep == NULL) |
137 | return -ENOMEM; |
138 | return 0; |
139 | } |
140 | |
141 | static void destroy_inodecache(void) |
142 | { |
143 | /* |
144 | * Make sure all delayed rcu free inodes are flushed before we |
145 | * destroy cache. |
146 | */ |
147 | rcu_barrier(); |
148 | kmem_cache_destroy(s: affs_inode_cachep); |
149 | } |
150 | |
151 | static const struct super_operations affs_sops = { |
152 | .alloc_inode = affs_alloc_inode, |
153 | .free_inode = affs_free_inode, |
154 | .write_inode = affs_write_inode, |
155 | .evict_inode = affs_evict_inode, |
156 | .put_super = affs_put_super, |
157 | .sync_fs = affs_sync_fs, |
158 | .statfs = affs_statfs, |
159 | .remount_fs = affs_remount, |
160 | .show_options = affs_show_options, |
161 | }; |
162 | |
163 | enum { |
164 | Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, |
165 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
166 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
167 | }; |
168 | |
169 | static const match_table_t tokens = { |
170 | {Opt_bs, "bs=%u" }, |
171 | {Opt_mode, "mode=%o" }, |
172 | {Opt_mufs, "mufs" }, |
173 | {Opt_notruncate, "nofilenametruncate" }, |
174 | {Opt_prefix, "prefix=%s" }, |
175 | {Opt_protect, "protect" }, |
176 | {Opt_reserved, "reserved=%u" }, |
177 | {Opt_root, "root=%u" }, |
178 | {Opt_setgid, "setgid=%u" }, |
179 | {Opt_setuid, "setuid=%u" }, |
180 | {Opt_verbose, "verbose" }, |
181 | {Opt_volume, "volume=%s" }, |
182 | {Opt_ignore, "grpquota" }, |
183 | {Opt_ignore, "noquota" }, |
184 | {Opt_ignore, "quota" }, |
185 | {Opt_ignore, "usrquota" }, |
186 | {Opt_err, NULL}, |
187 | }; |
188 | |
189 | static int |
190 | parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, |
191 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
192 | { |
193 | char *p; |
194 | substring_t args[MAX_OPT_ARGS]; |
195 | |
196 | /* Fill in defaults */ |
197 | |
198 | *uid = current_uid(); |
199 | *gid = current_gid(); |
200 | *reserved = 2; |
201 | *root = -1; |
202 | *blocksize = -1; |
203 | volume[0] = ':'; |
204 | volume[1] = 0; |
205 | *mount_opts = 0; |
206 | if (!options) |
207 | return 1; |
208 | |
209 | while ((p = strsep(&options, "," )) != NULL) { |
210 | int token, n, option; |
211 | if (!*p) |
212 | continue; |
213 | |
214 | token = match_token(p, table: tokens, args); |
215 | switch (token) { |
216 | case Opt_bs: |
217 | if (match_int(&args[0], result: &n)) |
218 | return 0; |
219 | if (n != 512 && n != 1024 && n != 2048 |
220 | && n != 4096) { |
221 | pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n" ); |
222 | return 0; |
223 | } |
224 | *blocksize = n; |
225 | break; |
226 | case Opt_mode: |
227 | if (match_octal(&args[0], result: &option)) |
228 | return 0; |
229 | *mode = option & 0777; |
230 | affs_set_opt(*mount_opts, SF_SETMODE); |
231 | break; |
232 | case Opt_mufs: |
233 | affs_set_opt(*mount_opts, SF_MUFS); |
234 | break; |
235 | case Opt_notruncate: |
236 | affs_set_opt(*mount_opts, SF_NO_TRUNCATE); |
237 | break; |
238 | case Opt_prefix: |
239 | kfree(objp: *prefix); |
240 | *prefix = match_strdup(&args[0]); |
241 | if (!*prefix) |
242 | return 0; |
243 | affs_set_opt(*mount_opts, SF_PREFIX); |
244 | break; |
245 | case Opt_protect: |
246 | affs_set_opt(*mount_opts, SF_IMMUTABLE); |
247 | break; |
248 | case Opt_reserved: |
249 | if (match_int(&args[0], result: reserved)) |
250 | return 0; |
251 | break; |
252 | case Opt_root: |
253 | if (match_int(&args[0], result: root)) |
254 | return 0; |
255 | break; |
256 | case Opt_setgid: |
257 | if (match_int(&args[0], result: &option)) |
258 | return 0; |
259 | *gid = make_kgid(current_user_ns(), gid: option); |
260 | if (!gid_valid(gid: *gid)) |
261 | return 0; |
262 | affs_set_opt(*mount_opts, SF_SETGID); |
263 | break; |
264 | case Opt_setuid: |
265 | if (match_int(&args[0], result: &option)) |
266 | return 0; |
267 | *uid = make_kuid(current_user_ns(), uid: option); |
268 | if (!uid_valid(uid: *uid)) |
269 | return 0; |
270 | affs_set_opt(*mount_opts, SF_SETUID); |
271 | break; |
272 | case Opt_verbose: |
273 | affs_set_opt(*mount_opts, SF_VERBOSE); |
274 | break; |
275 | case Opt_volume: { |
276 | char *vol = match_strdup(&args[0]); |
277 | if (!vol) |
278 | return 0; |
279 | strscpy(p: volume, q: vol, size: 32); |
280 | kfree(objp: vol); |
281 | break; |
282 | } |
283 | case Opt_ignore: |
284 | /* Silently ignore the quota options */ |
285 | break; |
286 | default: |
287 | pr_warn("Unrecognized mount option \"%s\" or missing value\n" , |
288 | p); |
289 | return 0; |
290 | } |
291 | } |
292 | return 1; |
293 | } |
294 | |
295 | static int affs_show_options(struct seq_file *m, struct dentry *root) |
296 | { |
297 | struct super_block *sb = root->d_sb; |
298 | struct affs_sb_info *sbi = AFFS_SB(sb); |
299 | |
300 | if (sb->s_blocksize) |
301 | seq_printf(m, fmt: ",bs=%lu" , sb->s_blocksize); |
302 | if (affs_test_opt(sbi->s_flags, SF_SETMODE)) |
303 | seq_printf(m, fmt: ",mode=%o" , sbi->s_mode); |
304 | if (affs_test_opt(sbi->s_flags, SF_MUFS)) |
305 | seq_puts(m, s: ",mufs" ); |
306 | if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE)) |
307 | seq_puts(m, s: ",nofilenametruncate" ); |
308 | if (affs_test_opt(sbi->s_flags, SF_PREFIX)) |
309 | seq_printf(m, fmt: ",prefix=%s" , sbi->s_prefix); |
310 | if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE)) |
311 | seq_puts(m, s: ",protect" ); |
312 | if (sbi->s_reserved != 2) |
313 | seq_printf(m, fmt: ",reserved=%u" , sbi->s_reserved); |
314 | if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2) |
315 | seq_printf(m, fmt: ",root=%u" , sbi->s_root_block); |
316 | if (affs_test_opt(sbi->s_flags, SF_SETGID)) |
317 | seq_printf(m, fmt: ",setgid=%u" , |
318 | from_kgid_munged(to: &init_user_ns, gid: sbi->s_gid)); |
319 | if (affs_test_opt(sbi->s_flags, SF_SETUID)) |
320 | seq_printf(m, fmt: ",setuid=%u" , |
321 | from_kuid_munged(to: &init_user_ns, uid: sbi->s_uid)); |
322 | if (affs_test_opt(sbi->s_flags, SF_VERBOSE)) |
323 | seq_puts(m, s: ",verbose" ); |
324 | if (sbi->s_volume[0]) |
325 | seq_printf(m, fmt: ",volume=%s" , sbi->s_volume); |
326 | return 0; |
327 | } |
328 | |
329 | /* This function definitely needs to be split up. Some fine day I'll |
330 | * hopefully have the guts to do so. Until then: sorry for the mess. |
331 | */ |
332 | |
333 | static int affs_fill_super(struct super_block *sb, void *data, int silent) |
334 | { |
335 | struct affs_sb_info *sbi; |
336 | struct buffer_head *root_bh = NULL; |
337 | struct buffer_head *boot_bh; |
338 | struct inode *root_inode = NULL; |
339 | s32 root_block; |
340 | int size, blocksize; |
341 | u32 chksum; |
342 | int num_bm; |
343 | int i, j; |
344 | kuid_t uid; |
345 | kgid_t gid; |
346 | int reserved; |
347 | unsigned long mount_flags; |
348 | int tmp_flags; /* fix remount prototype... */ |
349 | u8 sig[4]; |
350 | int ret; |
351 | |
352 | pr_debug("read_super(%s)\n" , data ? (const char *)data : "no options" ); |
353 | |
354 | sb->s_magic = AFFS_SUPER_MAGIC; |
355 | sb->s_op = &affs_sops; |
356 | sb->s_flags |= SB_NODIRATIME; |
357 | |
358 | sb->s_time_gran = NSEC_PER_SEC; |
359 | sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA; |
360 | sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min; |
361 | |
362 | sbi = kzalloc(size: sizeof(struct affs_sb_info), GFP_KERNEL); |
363 | if (!sbi) |
364 | return -ENOMEM; |
365 | |
366 | sb->s_fs_info = sbi; |
367 | sbi->sb = sb; |
368 | mutex_init(&sbi->s_bmlock); |
369 | spin_lock_init(&sbi->symlink_lock); |
370 | spin_lock_init(&sbi->work_lock); |
371 | INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); |
372 | |
373 | if (!parse_options(options: data,uid: &uid,gid: &gid,mode: &i,reserved: &reserved,root: &root_block, |
374 | blocksize: &blocksize,prefix: &sbi->s_prefix, |
375 | volume: sbi->s_volume, mount_opts: &mount_flags)) { |
376 | pr_err("Error parsing options\n" ); |
377 | return -EINVAL; |
378 | } |
379 | /* N.B. after this point s_prefix must be released */ |
380 | |
381 | sbi->s_flags = mount_flags; |
382 | sbi->s_mode = i; |
383 | sbi->s_uid = uid; |
384 | sbi->s_gid = gid; |
385 | sbi->s_reserved= reserved; |
386 | |
387 | /* Get the size of the device in 512-byte blocks. |
388 | * If we later see that the partition uses bigger |
389 | * blocks, we will have to change it. |
390 | */ |
391 | |
392 | size = bdev_nr_sectors(bdev: sb->s_bdev); |
393 | pr_debug("initial blocksize=%d, #blocks=%d\n" , 512, size); |
394 | |
395 | affs_set_blocksize(sb, PAGE_SIZE); |
396 | /* Try to find root block. Its location depends on the block size. */ |
397 | |
398 | i = bdev_logical_block_size(bdev: sb->s_bdev); |
399 | j = PAGE_SIZE; |
400 | if (blocksize > 0) { |
401 | i = j = blocksize; |
402 | size = size / (blocksize / 512); |
403 | } |
404 | |
405 | for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) { |
406 | sbi->s_root_block = root_block; |
407 | if (root_block < 0) |
408 | sbi->s_root_block = (reserved + size - 1) / 2; |
409 | pr_debug("setting blocksize to %d\n" , blocksize); |
410 | affs_set_blocksize(sb, size: blocksize); |
411 | sbi->s_partition_size = size; |
412 | |
413 | /* The root block location that was calculated above is not |
414 | * correct if the partition size is an odd number of 512- |
415 | * byte blocks, which will be rounded down to a number of |
416 | * 1024-byte blocks, and if there were an even number of |
417 | * reserved blocks. Ideally, all partition checkers should |
418 | * report the real number of blocks of the real blocksize, |
419 | * but since this just cannot be done, we have to try to |
420 | * find the root block anyways. In the above case, it is one |
421 | * block behind the calculated one. So we check this one, too. |
422 | */ |
423 | for (num_bm = 0; num_bm < 2; num_bm++) { |
424 | pr_debug("Dev %s, trying root=%u, bs=%d, " |
425 | "size=%d, reserved=%d\n" , |
426 | sb->s_id, |
427 | sbi->s_root_block + num_bm, |
428 | blocksize, size, reserved); |
429 | root_bh = affs_bread(sb, block: sbi->s_root_block + num_bm); |
430 | if (!root_bh) |
431 | continue; |
432 | if (!affs_checksum_block(sb, bh: root_bh) && |
433 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
434 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
435 | sbi->s_hashsize = blocksize / 4 - 56; |
436 | sbi->s_root_block += num_bm; |
437 | goto got_root; |
438 | } |
439 | affs_brelse(bh: root_bh); |
440 | root_bh = NULL; |
441 | } |
442 | } |
443 | if (!silent) |
444 | pr_err("No valid root block on device %s\n" , sb->s_id); |
445 | return -EINVAL; |
446 | |
447 | /* N.B. after this point bh must be released */ |
448 | got_root: |
449 | /* Keep super block in cache */ |
450 | sbi->s_root_bh = root_bh; |
451 | root_block = sbi->s_root_block; |
452 | |
453 | /* Find out which kind of FS we have */ |
454 | boot_bh = sb_bread(sb, block: 0); |
455 | if (!boot_bh) { |
456 | pr_err("Cannot read boot block\n" ); |
457 | return -EINVAL; |
458 | } |
459 | memcpy(sig, boot_bh->b_data, 4); |
460 | brelse(bh: boot_bh); |
461 | chksum = be32_to_cpu(*(__be32 *)sig); |
462 | |
463 | /* Dircache filesystems are compatible with non-dircache ones |
464 | * when reading. As long as they aren't supported, writing is |
465 | * not recommended. |
466 | */ |
467 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
468 | || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) { |
469 | pr_notice("Dircache FS - mounting %s read only\n" , sb->s_id); |
470 | sb->s_flags |= SB_RDONLY; |
471 | } |
472 | switch (chksum) { |
473 | case MUFS_FS: |
474 | case MUFS_INTLFFS: |
475 | case MUFS_DCFFS: |
476 | affs_set_opt(sbi->s_flags, SF_MUFS); |
477 | fallthrough; |
478 | case FS_INTLFFS: |
479 | case FS_DCFFS: |
480 | affs_set_opt(sbi->s_flags, SF_INTL); |
481 | break; |
482 | case MUFS_FFS: |
483 | affs_set_opt(sbi->s_flags, SF_MUFS); |
484 | break; |
485 | case FS_FFS: |
486 | break; |
487 | case MUFS_OFS: |
488 | affs_set_opt(sbi->s_flags, SF_MUFS); |
489 | fallthrough; |
490 | case FS_OFS: |
491 | affs_set_opt(sbi->s_flags, SF_OFS); |
492 | sb->s_flags |= SB_NOEXEC; |
493 | break; |
494 | case MUFS_DCOFS: |
495 | case MUFS_INTLOFS: |
496 | affs_set_opt(sbi->s_flags, SF_MUFS); |
497 | fallthrough; |
498 | case FS_DCOFS: |
499 | case FS_INTLOFS: |
500 | affs_set_opt(sbi->s_flags, SF_INTL); |
501 | affs_set_opt(sbi->s_flags, SF_OFS); |
502 | sb->s_flags |= SB_NOEXEC; |
503 | break; |
504 | default: |
505 | pr_err("Unknown filesystem on device %s: %08X\n" , |
506 | sb->s_id, chksum); |
507 | return -EINVAL; |
508 | } |
509 | |
510 | if (affs_test_opt(mount_flags, SF_VERBOSE)) { |
511 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
512 | pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n" , |
513 | len > 31 ? 31 : len, |
514 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
515 | sig, sig[3] + '0', blocksize); |
516 | } |
517 | |
518 | sb->s_flags |= SB_NODEV | SB_NOSUID; |
519 | |
520 | sbi->s_data_blksize = sb->s_blocksize; |
521 | if (affs_test_opt(sbi->s_flags, SF_OFS)) |
522 | sbi->s_data_blksize -= 24; |
523 | |
524 | tmp_flags = sb->s_flags; |
525 | ret = affs_init_bitmap(sb, flags: &tmp_flags); |
526 | if (ret) |
527 | return ret; |
528 | sb->s_flags = tmp_flags; |
529 | |
530 | /* set up enough so that it can read an inode */ |
531 | |
532 | root_inode = affs_iget(sb, ino: root_block); |
533 | if (IS_ERR(ptr: root_inode)) |
534 | return PTR_ERR(ptr: root_inode); |
535 | |
536 | if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL)) |
537 | sb->s_d_op = &affs_intl_dentry_operations; |
538 | else |
539 | sb->s_d_op = &affs_dentry_operations; |
540 | |
541 | sb->s_root = d_make_root(root_inode); |
542 | if (!sb->s_root) { |
543 | pr_err("AFFS: Get root inode failed\n" ); |
544 | return -ENOMEM; |
545 | } |
546 | |
547 | sb->s_export_op = &affs_export_ops; |
548 | pr_debug("s_flags=%lX\n" , sb->s_flags); |
549 | return 0; |
550 | } |
551 | |
552 | static int |
553 | affs_remount(struct super_block *sb, int *flags, char *data) |
554 | { |
555 | struct affs_sb_info *sbi = AFFS_SB(sb); |
556 | int blocksize; |
557 | kuid_t uid; |
558 | kgid_t gid; |
559 | int mode; |
560 | int reserved; |
561 | int root_block; |
562 | unsigned long mount_flags; |
563 | int res = 0; |
564 | char volume[32]; |
565 | char *prefix = NULL; |
566 | |
567 | pr_debug("%s(flags=0x%x,opts=\"%s\")\n" , __func__, *flags, data); |
568 | |
569 | sync_filesystem(sb); |
570 | *flags |= SB_NODIRATIME; |
571 | |
572 | memcpy(volume, sbi->s_volume, 32); |
573 | if (!parse_options(options: data, uid: &uid, gid: &gid, mode: &mode, reserved: &reserved, root: &root_block, |
574 | blocksize: &blocksize, prefix: &prefix, volume, |
575 | mount_opts: &mount_flags)) { |
576 | kfree(objp: prefix); |
577 | return -EINVAL; |
578 | } |
579 | |
580 | flush_delayed_work(dwork: &sbi->sb_work); |
581 | |
582 | sbi->s_flags = mount_flags; |
583 | sbi->s_mode = mode; |
584 | sbi->s_uid = uid; |
585 | sbi->s_gid = gid; |
586 | /* protect against readers */ |
587 | spin_lock(lock: &sbi->symlink_lock); |
588 | if (prefix) { |
589 | kfree(objp: sbi->s_prefix); |
590 | sbi->s_prefix = prefix; |
591 | } |
592 | memcpy(sbi->s_volume, volume, 32); |
593 | spin_unlock(lock: &sbi->symlink_lock); |
594 | |
595 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
596 | return 0; |
597 | |
598 | if (*flags & SB_RDONLY) |
599 | affs_free_bitmap(sb); |
600 | else |
601 | res = affs_init_bitmap(sb, flags); |
602 | |
603 | return res; |
604 | } |
605 | |
606 | static int |
607 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
608 | { |
609 | struct super_block *sb = dentry->d_sb; |
610 | int free; |
611 | u64 id = huge_encode_dev(dev: sb->s_bdev->bd_dev); |
612 | |
613 | pr_debug("%s() partsize=%d, reserved=%d\n" , |
614 | __func__, AFFS_SB(sb)->s_partition_size, |
615 | AFFS_SB(sb)->s_reserved); |
616 | |
617 | free = affs_count_free_blocks(s: sb); |
618 | buf->f_type = AFFS_SUPER_MAGIC; |
619 | buf->f_bsize = sb->s_blocksize; |
620 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
621 | buf->f_bfree = free; |
622 | buf->f_bavail = free; |
623 | buf->f_fsid = u64_to_fsid(v: id); |
624 | buf->f_namelen = AFFSNAMEMAX; |
625 | return 0; |
626 | } |
627 | |
628 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
629 | int flags, const char *dev_name, void *data) |
630 | { |
631 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: affs_fill_super); |
632 | } |
633 | |
634 | static void affs_kill_sb(struct super_block *sb) |
635 | { |
636 | struct affs_sb_info *sbi = AFFS_SB(sb); |
637 | kill_block_super(sb); |
638 | if (sbi) { |
639 | affs_free_bitmap(sb); |
640 | affs_brelse(bh: sbi->s_root_bh); |
641 | kfree(objp: sbi->s_prefix); |
642 | mutex_destroy(lock: &sbi->s_bmlock); |
643 | kfree(objp: sbi); |
644 | } |
645 | } |
646 | |
647 | static struct file_system_type affs_fs_type = { |
648 | .owner = THIS_MODULE, |
649 | .name = "affs" , |
650 | .mount = affs_mount, |
651 | .kill_sb = affs_kill_sb, |
652 | .fs_flags = FS_REQUIRES_DEV, |
653 | }; |
654 | MODULE_ALIAS_FS("affs" ); |
655 | |
656 | static int __init init_affs_fs(void) |
657 | { |
658 | int err = init_inodecache(); |
659 | if (err) |
660 | goto out1; |
661 | err = register_filesystem(&affs_fs_type); |
662 | if (err) |
663 | goto out; |
664 | return 0; |
665 | out: |
666 | destroy_inodecache(); |
667 | out1: |
668 | return err; |
669 | } |
670 | |
671 | static void __exit exit_affs_fs(void) |
672 | { |
673 | unregister_filesystem(&affs_fs_type); |
674 | destroy_inodecache(); |
675 | } |
676 | |
677 | MODULE_DESCRIPTION("Amiga filesystem support for Linux" ); |
678 | MODULE_LICENSE("GPL" ); |
679 | |
680 | module_init(init_affs_fs) |
681 | module_exit(exit_affs_fs) |
682 | |