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1 | /* | |
2 | * linux/fs/ext2/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/parser.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/buffer_head.h> | |
28 | #include <linux/exportfs.h> | |
29 | #include <linux/vfs.h> | |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/mount.h> | |
32 | #include <linux/log2.h> | |
33 | #include <linux/quotaops.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include "ext2.h" | |
36 | #include "xattr.h" | |
37 | #include "acl.h" | |
38 | #include "xip.h" | |
39 | ||
40 | static void ext2_sync_super(struct super_block *sb, | |
41 | struct ext2_super_block *es, int wait); | |
42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); | |
43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); | |
44 | static int ext2_sync_fs(struct super_block *sb, int wait); | |
45 | ||
46 | void ext2_error (struct super_block * sb, const char * function, | |
47 | const char * fmt, ...) | |
48 | { | |
49 | va_list args; | |
50 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
51 | struct ext2_super_block *es = sbi->s_es; | |
52 | ||
53 | if (!(sb->s_flags & MS_RDONLY)) { | |
54 | spin_lock(&sbi->s_lock); | |
55 | sbi->s_mount_state |= EXT2_ERROR_FS; | |
56 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); | |
57 | spin_unlock(&sbi->s_lock); | |
58 | ext2_sync_super(sb, es, 1); | |
59 | } | |
60 | ||
61 | va_start(args, fmt); | |
62 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: ", sb->s_id, function); | |
63 | vprintk(fmt, args); | |
64 | printk("\n"); | |
65 | va_end(args); | |
66 | ||
67 | if (test_opt(sb, ERRORS_PANIC)) | |
68 | panic("EXT2-fs: panic from previous error\n"); | |
69 | if (test_opt(sb, ERRORS_RO)) { | |
70 | ext2_msg(sb, KERN_CRIT, | |
71 | "error: remounting filesystem read-only"); | |
72 | sb->s_flags |= MS_RDONLY; | |
73 | } | |
74 | } | |
75 | ||
76 | void ext2_msg(struct super_block *sb, const char *prefix, | |
77 | const char *fmt, ...) | |
78 | { | |
79 | va_list args; | |
80 | ||
81 | va_start(args, fmt); | |
82 | printk("%sEXT2-fs (%s): ", prefix, sb->s_id); | |
83 | vprintk(fmt, args); | |
84 | printk("\n"); | |
85 | va_end(args); | |
86 | } | |
87 | ||
88 | /* | |
89 | * This must be called with sbi->s_lock held. | |
90 | */ | |
91 | void ext2_update_dynamic_rev(struct super_block *sb) | |
92 | { | |
93 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
94 | ||
95 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
96 | return; | |
97 | ||
98 | ext2_msg(sb, KERN_WARNING, | |
99 | "warning: updating to rev %d because of " | |
100 | "new feature flag, running e2fsck is recommended", | |
101 | EXT2_DYNAMIC_REV); | |
102 | ||
103 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
104 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
105 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
106 | /* leave es->s_feature_*compat flags alone */ | |
107 | /* es->s_uuid will be set by e2fsck if empty */ | |
108 | ||
109 | /* | |
110 | * The rest of the superblock fields should be zero, and if not it | |
111 | * means they are likely already in use, so leave them alone. We | |
112 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
113 | */ | |
114 | } | |
115 | ||
116 | static void ext2_put_super (struct super_block * sb) | |
117 | { | |
118 | int db_count; | |
119 | int i; | |
120 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
121 | ||
122 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
123 | ||
124 | if (sb->s_dirt) | |
125 | ext2_write_super(sb); | |
126 | ||
127 | ext2_xattr_put_super(sb); | |
128 | if (!(sb->s_flags & MS_RDONLY)) { | |
129 | struct ext2_super_block *es = sbi->s_es; | |
130 | ||
131 | spin_lock(&sbi->s_lock); | |
132 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
133 | spin_unlock(&sbi->s_lock); | |
134 | ext2_sync_super(sb, es, 1); | |
135 | } | |
136 | db_count = sbi->s_gdb_count; | |
137 | for (i = 0; i < db_count; i++) | |
138 | if (sbi->s_group_desc[i]) | |
139 | brelse (sbi->s_group_desc[i]); | |
140 | kfree(sbi->s_group_desc); | |
141 | kfree(sbi->s_debts); | |
142 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
143 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
144 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
145 | brelse (sbi->s_sbh); | |
146 | sb->s_fs_info = NULL; | |
147 | kfree(sbi->s_blockgroup_lock); | |
148 | kfree(sbi); | |
149 | } | |
150 | ||
151 | static struct kmem_cache * ext2_inode_cachep; | |
152 | ||
153 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
154 | { | |
155 | struct ext2_inode_info *ei; | |
156 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); | |
157 | if (!ei) | |
158 | return NULL; | |
159 | ei->i_block_alloc_info = NULL; | |
160 | ei->vfs_inode.i_version = 1; | |
161 | return &ei->vfs_inode; | |
162 | } | |
163 | ||
164 | static void ext2_i_callback(struct rcu_head *head) | |
165 | { | |
166 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
167 | INIT_LIST_HEAD(&inode->i_dentry); | |
168 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); | |
169 | } | |
170 | ||
171 | static void ext2_destroy_inode(struct inode *inode) | |
172 | { | |
173 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
174 | } | |
175 | ||
176 | static void init_once(void *foo) | |
177 | { | |
178 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
179 | ||
180 | rwlock_init(&ei->i_meta_lock); | |
181 | #ifdef CONFIG_EXT2_FS_XATTR | |
182 | init_rwsem(&ei->xattr_sem); | |
183 | #endif | |
184 | mutex_init(&ei->truncate_mutex); | |
185 | inode_init_once(&ei->vfs_inode); | |
186 | } | |
187 | ||
188 | static int init_inodecache(void) | |
189 | { | |
190 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
191 | sizeof(struct ext2_inode_info), | |
192 | 0, (SLAB_RECLAIM_ACCOUNT| | |
193 | SLAB_MEM_SPREAD), | |
194 | init_once); | |
195 | if (ext2_inode_cachep == NULL) | |
196 | return -ENOMEM; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static void destroy_inodecache(void) | |
201 | { | |
202 | kmem_cache_destroy(ext2_inode_cachep); | |
203 | } | |
204 | ||
205 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) | |
206 | { | |
207 | struct super_block *sb = vfs->mnt_sb; | |
208 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
209 | struct ext2_super_block *es = sbi->s_es; | |
210 | unsigned long def_mount_opts; | |
211 | ||
212 | spin_lock(&sbi->s_lock); | |
213 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
214 | ||
215 | if (sbi->s_sb_block != 1) | |
216 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
217 | if (test_opt(sb, MINIX_DF)) | |
218 | seq_puts(seq, ",minixdf"); | |
219 | if (test_opt(sb, GRPID)) | |
220 | seq_puts(seq, ",grpid"); | |
221 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) | |
222 | seq_puts(seq, ",nogrpid"); | |
223 | if (sbi->s_resuid != EXT2_DEF_RESUID || | |
224 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { | |
225 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
226 | } | |
227 | if (sbi->s_resgid != EXT2_DEF_RESGID || | |
228 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { | |
229 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
230 | } | |
231 | if (test_opt(sb, ERRORS_RO)) { | |
232 | int def_errors = le16_to_cpu(es->s_errors); | |
233 | ||
234 | if (def_errors == EXT2_ERRORS_PANIC || | |
235 | def_errors == EXT2_ERRORS_CONTINUE) { | |
236 | seq_puts(seq, ",errors=remount-ro"); | |
237 | } | |
238 | } | |
239 | if (test_opt(sb, ERRORS_CONT)) | |
240 | seq_puts(seq, ",errors=continue"); | |
241 | if (test_opt(sb, ERRORS_PANIC)) | |
242 | seq_puts(seq, ",errors=panic"); | |
243 | if (test_opt(sb, NO_UID32)) | |
244 | seq_puts(seq, ",nouid32"); | |
245 | if (test_opt(sb, DEBUG)) | |
246 | seq_puts(seq, ",debug"); | |
247 | if (test_opt(sb, OLDALLOC)) | |
248 | seq_puts(seq, ",oldalloc"); | |
249 | ||
250 | #ifdef CONFIG_EXT2_FS_XATTR | |
251 | if (test_opt(sb, XATTR_USER)) | |
252 | seq_puts(seq, ",user_xattr"); | |
253 | if (!test_opt(sb, XATTR_USER) && | |
254 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
255 | seq_puts(seq, ",nouser_xattr"); | |
256 | } | |
257 | #endif | |
258 | ||
259 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
260 | if (test_opt(sb, POSIX_ACL)) | |
261 | seq_puts(seq, ",acl"); | |
262 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
263 | seq_puts(seq, ",noacl"); | |
264 | #endif | |
265 | ||
266 | if (test_opt(sb, NOBH)) | |
267 | seq_puts(seq, ",nobh"); | |
268 | ||
269 | #if defined(CONFIG_QUOTA) | |
270 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
271 | seq_puts(seq, ",usrquota"); | |
272 | ||
273 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
274 | seq_puts(seq, ",grpquota"); | |
275 | #endif | |
276 | ||
277 | #if defined(CONFIG_EXT2_FS_XIP) | |
278 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) | |
279 | seq_puts(seq, ",xip"); | |
280 | #endif | |
281 | ||
282 | if (!test_opt(sb, RESERVATION)) | |
283 | seq_puts(seq, ",noreservation"); | |
284 | ||
285 | spin_unlock(&sbi->s_lock); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | #ifdef CONFIG_QUOTA | |
290 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
291 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
292 | #endif | |
293 | ||
294 | static const struct super_operations ext2_sops = { | |
295 | .alloc_inode = ext2_alloc_inode, | |
296 | .destroy_inode = ext2_destroy_inode, | |
297 | .write_inode = ext2_write_inode, | |
298 | .evict_inode = ext2_evict_inode, | |
299 | .put_super = ext2_put_super, | |
300 | .write_super = ext2_write_super, | |
301 | .sync_fs = ext2_sync_fs, | |
302 | .statfs = ext2_statfs, | |
303 | .remount_fs = ext2_remount, | |
304 | .show_options = ext2_show_options, | |
305 | #ifdef CONFIG_QUOTA | |
306 | .quota_read = ext2_quota_read, | |
307 | .quota_write = ext2_quota_write, | |
308 | #endif | |
309 | }; | |
310 | ||
311 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, | |
312 | u64 ino, u32 generation) | |
313 | { | |
314 | struct inode *inode; | |
315 | ||
316 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
317 | return ERR_PTR(-ESTALE); | |
318 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
319 | return ERR_PTR(-ESTALE); | |
320 | ||
321 | /* iget isn't really right if the inode is currently unallocated!! | |
322 | * ext2_read_inode currently does appropriate checks, but | |
323 | * it might be "neater" to call ext2_get_inode first and check | |
324 | * if the inode is valid..... | |
325 | */ | |
326 | inode = ext2_iget(sb, ino); | |
327 | if (IS_ERR(inode)) | |
328 | return ERR_CAST(inode); | |
329 | if (generation && inode->i_generation != generation) { | |
330 | /* we didn't find the right inode.. */ | |
331 | iput(inode); | |
332 | return ERR_PTR(-ESTALE); | |
333 | } | |
334 | return inode; | |
335 | } | |
336 | ||
337 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
338 | int fh_len, int fh_type) | |
339 | { | |
340 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
341 | ext2_nfs_get_inode); | |
342 | } | |
343 | ||
344 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
345 | int fh_len, int fh_type) | |
346 | { | |
347 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
348 | ext2_nfs_get_inode); | |
349 | } | |
350 | ||
351 | /* Yes, most of these are left as NULL!! | |
352 | * A NULL value implies the default, which works with ext2-like file | |
353 | * systems, but can be improved upon. | |
354 | * Currently only get_parent is required. | |
355 | */ | |
356 | static const struct export_operations ext2_export_ops = { | |
357 | .fh_to_dentry = ext2_fh_to_dentry, | |
358 | .fh_to_parent = ext2_fh_to_parent, | |
359 | .get_parent = ext2_get_parent, | |
360 | }; | |
361 | ||
362 | static unsigned long get_sb_block(void **data) | |
363 | { | |
364 | unsigned long sb_block; | |
365 | char *options = (char *) *data; | |
366 | ||
367 | if (!options || strncmp(options, "sb=", 3) != 0) | |
368 | return 1; /* Default location */ | |
369 | options += 3; | |
370 | sb_block = simple_strtoul(options, &options, 0); | |
371 | if (*options && *options != ',') { | |
372 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
373 | (char *) *data); | |
374 | return 1; | |
375 | } | |
376 | if (*options == ',') | |
377 | options++; | |
378 | *data = (void *) options; | |
379 | return sb_block; | |
380 | } | |
381 | ||
382 | enum { | |
383 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
384 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, | |
385 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, | |
386 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, | |
387 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, | |
388 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation | |
389 | }; | |
390 | ||
391 | static const match_table_t tokens = { | |
392 | {Opt_bsd_df, "bsddf"}, | |
393 | {Opt_minix_df, "minixdf"}, | |
394 | {Opt_grpid, "grpid"}, | |
395 | {Opt_grpid, "bsdgroups"}, | |
396 | {Opt_nogrpid, "nogrpid"}, | |
397 | {Opt_nogrpid, "sysvgroups"}, | |
398 | {Opt_resgid, "resgid=%u"}, | |
399 | {Opt_resuid, "resuid=%u"}, | |
400 | {Opt_sb, "sb=%u"}, | |
401 | {Opt_err_cont, "errors=continue"}, | |
402 | {Opt_err_panic, "errors=panic"}, | |
403 | {Opt_err_ro, "errors=remount-ro"}, | |
404 | {Opt_nouid32, "nouid32"}, | |
405 | {Opt_nocheck, "check=none"}, | |
406 | {Opt_nocheck, "nocheck"}, | |
407 | {Opt_debug, "debug"}, | |
408 | {Opt_oldalloc, "oldalloc"}, | |
409 | {Opt_orlov, "orlov"}, | |
410 | {Opt_nobh, "nobh"}, | |
411 | {Opt_user_xattr, "user_xattr"}, | |
412 | {Opt_nouser_xattr, "nouser_xattr"}, | |
413 | {Opt_acl, "acl"}, | |
414 | {Opt_noacl, "noacl"}, | |
415 | {Opt_xip, "xip"}, | |
416 | {Opt_grpquota, "grpquota"}, | |
417 | {Opt_ignore, "noquota"}, | |
418 | {Opt_quota, "quota"}, | |
419 | {Opt_usrquota, "usrquota"}, | |
420 | {Opt_reservation, "reservation"}, | |
421 | {Opt_noreservation, "noreservation"}, | |
422 | {Opt_err, NULL} | |
423 | }; | |
424 | ||
425 | static int parse_options(char *options, struct super_block *sb) | |
426 | { | |
427 | char *p; | |
428 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
429 | substring_t args[MAX_OPT_ARGS]; | |
430 | int option; | |
431 | ||
432 | if (!options) | |
433 | return 1; | |
434 | ||
435 | while ((p = strsep (&options, ",")) != NULL) { | |
436 | int token; | |
437 | if (!*p) | |
438 | continue; | |
439 | ||
440 | token = match_token(p, tokens, args); | |
441 | switch (token) { | |
442 | case Opt_bsd_df: | |
443 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
444 | break; | |
445 | case Opt_minix_df: | |
446 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
447 | break; | |
448 | case Opt_grpid: | |
449 | set_opt (sbi->s_mount_opt, GRPID); | |
450 | break; | |
451 | case Opt_nogrpid: | |
452 | clear_opt (sbi->s_mount_opt, GRPID); | |
453 | break; | |
454 | case Opt_resuid: | |
455 | if (match_int(&args[0], &option)) | |
456 | return 0; | |
457 | sbi->s_resuid = option; | |
458 | break; | |
459 | case Opt_resgid: | |
460 | if (match_int(&args[0], &option)) | |
461 | return 0; | |
462 | sbi->s_resgid = option; | |
463 | break; | |
464 | case Opt_sb: | |
465 | /* handled by get_sb_block() instead of here */ | |
466 | /* *sb_block = match_int(&args[0]); */ | |
467 | break; | |
468 | case Opt_err_panic: | |
469 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
470 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
471 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
472 | break; | |
473 | case Opt_err_ro: | |
474 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
475 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
476 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
477 | break; | |
478 | case Opt_err_cont: | |
479 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
480 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
481 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
482 | break; | |
483 | case Opt_nouid32: | |
484 | set_opt (sbi->s_mount_opt, NO_UID32); | |
485 | break; | |
486 | case Opt_nocheck: | |
487 | clear_opt (sbi->s_mount_opt, CHECK); | |
488 | break; | |
489 | case Opt_debug: | |
490 | set_opt (sbi->s_mount_opt, DEBUG); | |
491 | break; | |
492 | case Opt_oldalloc: | |
493 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
494 | break; | |
495 | case Opt_orlov: | |
496 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
497 | break; | |
498 | case Opt_nobh: | |
499 | set_opt (sbi->s_mount_opt, NOBH); | |
500 | break; | |
501 | #ifdef CONFIG_EXT2_FS_XATTR | |
502 | case Opt_user_xattr: | |
503 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
504 | break; | |
505 | case Opt_nouser_xattr: | |
506 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
507 | break; | |
508 | #else | |
509 | case Opt_user_xattr: | |
510 | case Opt_nouser_xattr: | |
511 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" | |
512 | "not supported"); | |
513 | break; | |
514 | #endif | |
515 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
516 | case Opt_acl: | |
517 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
518 | break; | |
519 | case Opt_noacl: | |
520 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
521 | break; | |
522 | #else | |
523 | case Opt_acl: | |
524 | case Opt_noacl: | |
525 | ext2_msg(sb, KERN_INFO, | |
526 | "(no)acl options not supported"); | |
527 | break; | |
528 | #endif | |
529 | case Opt_xip: | |
530 | #ifdef CONFIG_EXT2_FS_XIP | |
531 | set_opt (sbi->s_mount_opt, XIP); | |
532 | #else | |
533 | ext2_msg(sb, KERN_INFO, "xip option not supported"); | |
534 | #endif | |
535 | break; | |
536 | ||
537 | #if defined(CONFIG_QUOTA) | |
538 | case Opt_quota: | |
539 | case Opt_usrquota: | |
540 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
541 | break; | |
542 | ||
543 | case Opt_grpquota: | |
544 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
545 | break; | |
546 | #else | |
547 | case Opt_quota: | |
548 | case Opt_usrquota: | |
549 | case Opt_grpquota: | |
550 | ext2_msg(sb, KERN_INFO, | |
551 | "quota operations not supported"); | |
552 | break; | |
553 | #endif | |
554 | ||
555 | case Opt_reservation: | |
556 | set_opt(sbi->s_mount_opt, RESERVATION); | |
557 | ext2_msg(sb, KERN_INFO, "reservations ON"); | |
558 | break; | |
559 | case Opt_noreservation: | |
560 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
561 | ext2_msg(sb, KERN_INFO, "reservations OFF"); | |
562 | break; | |
563 | case Opt_ignore: | |
564 | break; | |
565 | default: | |
566 | return 0; | |
567 | } | |
568 | } | |
569 | return 1; | |
570 | } | |
571 | ||
572 | static int ext2_setup_super (struct super_block * sb, | |
573 | struct ext2_super_block * es, | |
574 | int read_only) | |
575 | { | |
576 | int res = 0; | |
577 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
578 | ||
579 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
580 | ext2_msg(sb, KERN_ERR, | |
581 | "error: revision level too high, " | |
582 | "forcing read-only mode"); | |
583 | res = MS_RDONLY; | |
584 | } | |
585 | if (read_only) | |
586 | return res; | |
587 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
588 | ext2_msg(sb, KERN_WARNING, | |
589 | "warning: mounting unchecked fs, " | |
590 | "running e2fsck is recommended"); | |
591 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) | |
592 | ext2_msg(sb, KERN_WARNING, | |
593 | "warning: mounting fs with errors, " | |
594 | "running e2fsck is recommended"); | |
595 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
596 | le16_to_cpu(es->s_mnt_count) >= | |
597 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
598 | ext2_msg(sb, KERN_WARNING, | |
599 | "warning: maximal mount count reached, " | |
600 | "running e2fsck is recommended"); | |
601 | else if (le32_to_cpu(es->s_checkinterval) && | |
602 | (le32_to_cpu(es->s_lastcheck) + | |
603 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
604 | ext2_msg(sb, KERN_WARNING, | |
605 | "warning: checktime reached, " | |
606 | "running e2fsck is recommended"); | |
607 | if (!le16_to_cpu(es->s_max_mnt_count)) | |
608 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
609 | le16_add_cpu(&es->s_mnt_count, 1); | |
610 | if (test_opt (sb, DEBUG)) | |
611 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " | |
612 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
613 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, | |
614 | sbi->s_frag_size, | |
615 | sbi->s_groups_count, | |
616 | EXT2_BLOCKS_PER_GROUP(sb), | |
617 | EXT2_INODES_PER_GROUP(sb), | |
618 | sbi->s_mount_opt); | |
619 | return res; | |
620 | } | |
621 | ||
622 | static int ext2_check_descriptors(struct super_block *sb) | |
623 | { | |
624 | int i; | |
625 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
626 | ||
627 | ext2_debug ("Checking group descriptors"); | |
628 | ||
629 | for (i = 0; i < sbi->s_groups_count; i++) { | |
630 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
631 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); | |
632 | ext2_fsblk_t last_block; | |
633 | ||
634 | if (i == sbi->s_groups_count - 1) | |
635 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
636 | else | |
637 | last_block = first_block + | |
638 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
639 | ||
640 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || | |
641 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
642 | { | |
643 | ext2_error (sb, "ext2_check_descriptors", | |
644 | "Block bitmap for group %d" | |
645 | " not in group (block %lu)!", | |
646 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
647 | return 0; | |
648 | } | |
649 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || | |
650 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
651 | { | |
652 | ext2_error (sb, "ext2_check_descriptors", | |
653 | "Inode bitmap for group %d" | |
654 | " not in group (block %lu)!", | |
655 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
656 | return 0; | |
657 | } | |
658 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || | |
659 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > | |
660 | last_block) | |
661 | { | |
662 | ext2_error (sb, "ext2_check_descriptors", | |
663 | "Inode table for group %d" | |
664 | " not in group (block %lu)!", | |
665 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
666 | return 0; | |
667 | } | |
668 | } | |
669 | return 1; | |
670 | } | |
671 | ||
672 | /* | |
673 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
674 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
675 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
676 | */ | |
677 | static loff_t ext2_max_size(int bits) | |
678 | { | |
679 | loff_t res = EXT2_NDIR_BLOCKS; | |
680 | int meta_blocks; | |
681 | loff_t upper_limit; | |
682 | ||
683 | /* This is calculated to be the largest file size for a | |
684 | * dense, file such that the total number of | |
685 | * sectors in the file, including data and all indirect blocks, | |
686 | * does not exceed 2^32 -1 | |
687 | * __u32 i_blocks representing the total number of | |
688 | * 512 bytes blocks of the file | |
689 | */ | |
690 | upper_limit = (1LL << 32) - 1; | |
691 | ||
692 | /* total blocks in file system block size */ | |
693 | upper_limit >>= (bits - 9); | |
694 | ||
695 | ||
696 | /* indirect blocks */ | |
697 | meta_blocks = 1; | |
698 | /* double indirect blocks */ | |
699 | meta_blocks += 1 + (1LL << (bits-2)); | |
700 | /* tripple indirect blocks */ | |
701 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
702 | ||
703 | upper_limit -= meta_blocks; | |
704 | upper_limit <<= bits; | |
705 | ||
706 | res += 1LL << (bits-2); | |
707 | res += 1LL << (2*(bits-2)); | |
708 | res += 1LL << (3*(bits-2)); | |
709 | res <<= bits; | |
710 | if (res > upper_limit) | |
711 | res = upper_limit; | |
712 | ||
713 | if (res > MAX_LFS_FILESIZE) | |
714 | res = MAX_LFS_FILESIZE; | |
715 | ||
716 | return res; | |
717 | } | |
718 | ||
719 | static unsigned long descriptor_loc(struct super_block *sb, | |
720 | unsigned long logic_sb_block, | |
721 | int nr) | |
722 | { | |
723 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
724 | unsigned long bg, first_meta_bg; | |
725 | int has_super = 0; | |
726 | ||
727 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
728 | ||
729 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
730 | nr < first_meta_bg) | |
731 | return (logic_sb_block + nr + 1); | |
732 | bg = sbi->s_desc_per_block * nr; | |
733 | if (ext2_bg_has_super(sb, bg)) | |
734 | has_super = 1; | |
735 | ||
736 | return ext2_group_first_block_no(sb, bg) + has_super; | |
737 | } | |
738 | ||
739 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
740 | { | |
741 | struct buffer_head * bh; | |
742 | struct ext2_sb_info * sbi; | |
743 | struct ext2_super_block * es; | |
744 | struct inode *root; | |
745 | unsigned long block; | |
746 | unsigned long sb_block = get_sb_block(&data); | |
747 | unsigned long logic_sb_block; | |
748 | unsigned long offset = 0; | |
749 | unsigned long def_mount_opts; | |
750 | long ret = -EINVAL; | |
751 | int blocksize = BLOCK_SIZE; | |
752 | int db_count; | |
753 | int i, j; | |
754 | __le32 features; | |
755 | int err; | |
756 | ||
757 | err = -ENOMEM; | |
758 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
759 | if (!sbi) | |
760 | goto failed_unlock; | |
761 | ||
762 | sbi->s_blockgroup_lock = | |
763 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
764 | if (!sbi->s_blockgroup_lock) { | |
765 | kfree(sbi); | |
766 | goto failed_unlock; | |
767 | } | |
768 | sb->s_fs_info = sbi; | |
769 | sbi->s_sb_block = sb_block; | |
770 | ||
771 | spin_lock_init(&sbi->s_lock); | |
772 | ||
773 | /* | |
774 | * See what the current blocksize for the device is, and | |
775 | * use that as the blocksize. Otherwise (or if the blocksize | |
776 | * is smaller than the default) use the default. | |
777 | * This is important for devices that have a hardware | |
778 | * sectorsize that is larger than the default. | |
779 | */ | |
780 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
781 | if (!blocksize) { | |
782 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); | |
783 | goto failed_sbi; | |
784 | } | |
785 | ||
786 | /* | |
787 | * If the superblock doesn't start on a hardware sector boundary, | |
788 | * calculate the offset. | |
789 | */ | |
790 | if (blocksize != BLOCK_SIZE) { | |
791 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
792 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
793 | } else { | |
794 | logic_sb_block = sb_block; | |
795 | } | |
796 | ||
797 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
798 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); | |
799 | goto failed_sbi; | |
800 | } | |
801 | /* | |
802 | * Note: s_es must be initialized as soon as possible because | |
803 | * some ext2 macro-instructions depend on its value | |
804 | */ | |
805 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
806 | sbi->s_es = es; | |
807 | sb->s_magic = le16_to_cpu(es->s_magic); | |
808 | ||
809 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
810 | goto cantfind_ext2; | |
811 | ||
812 | /* Set defaults before we parse the mount options */ | |
813 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
814 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
815 | set_opt(sbi->s_mount_opt, DEBUG); | |
816 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
817 | set_opt(sbi->s_mount_opt, GRPID); | |
818 | if (def_mount_opts & EXT2_DEFM_UID16) | |
819 | set_opt(sbi->s_mount_opt, NO_UID32); | |
820 | #ifdef CONFIG_EXT2_FS_XATTR | |
821 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) | |
822 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
823 | #endif | |
824 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
825 | if (def_mount_opts & EXT2_DEFM_ACL) | |
826 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
827 | #endif | |
828 | ||
829 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
830 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
831 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) | |
832 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
833 | else | |
834 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
835 | ||
836 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
837 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
838 | ||
839 | set_opt(sbi->s_mount_opt, RESERVATION); | |
840 | ||
841 | if (!parse_options((char *) data, sb)) | |
842 | goto failed_mount; | |
843 | ||
844 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
845 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
846 | MS_POSIXACL : 0); | |
847 | ||
848 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset | |
849 | EXT2_MOUNT_XIP if not */ | |
850 | ||
851 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
852 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
853 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
854 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
855 | ext2_msg(sb, KERN_WARNING, | |
856 | "warning: feature flags set on rev 0 fs, " | |
857 | "running e2fsck is recommended"); | |
858 | /* | |
859 | * Check feature flags regardless of the revision level, since we | |
860 | * previously didn't change the revision level when setting the flags, | |
861 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
862 | */ | |
863 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
864 | if (features) { | |
865 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " | |
866 | "unsupported optional features (%x)", | |
867 | le32_to_cpu(features)); | |
868 | goto failed_mount; | |
869 | } | |
870 | if (!(sb->s_flags & MS_RDONLY) && | |
871 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
872 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " | |
873 | "unsupported optional features (%x)", | |
874 | le32_to_cpu(features)); | |
875 | goto failed_mount; | |
876 | } | |
877 | ||
878 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
879 | ||
880 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { | |
881 | if (!silent) | |
882 | ext2_msg(sb, KERN_ERR, | |
883 | "error: unsupported blocksize for xip"); | |
884 | goto failed_mount; | |
885 | } | |
886 | ||
887 | /* If the blocksize doesn't match, re-read the thing.. */ | |
888 | if (sb->s_blocksize != blocksize) { | |
889 | brelse(bh); | |
890 | ||
891 | if (!sb_set_blocksize(sb, blocksize)) { | |
892 | ext2_msg(sb, KERN_ERR, "error: blocksize is too small"); | |
893 | goto failed_sbi; | |
894 | } | |
895 | ||
896 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
897 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
898 | bh = sb_bread(sb, logic_sb_block); | |
899 | if(!bh) { | |
900 | ext2_msg(sb, KERN_ERR, "error: couldn't read" | |
901 | "superblock on 2nd try"); | |
902 | goto failed_sbi; | |
903 | } | |
904 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
905 | sbi->s_es = es; | |
906 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
907 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); | |
908 | goto failed_mount; | |
909 | } | |
910 | } | |
911 | ||
912 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
913 | ||
914 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
915 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
916 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
917 | } else { | |
918 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
919 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
920 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
921 | !is_power_of_2(sbi->s_inode_size) || | |
922 | (sbi->s_inode_size > blocksize)) { | |
923 | ext2_msg(sb, KERN_ERR, | |
924 | "error: unsupported inode size: %d", | |
925 | sbi->s_inode_size); | |
926 | goto failed_mount; | |
927 | } | |
928 | } | |
929 | ||
930 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
931 | le32_to_cpu(es->s_log_frag_size); | |
932 | if (sbi->s_frag_size == 0) | |
933 | goto cantfind_ext2; | |
934 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
935 | ||
936 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
937 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
938 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
939 | ||
940 | if (EXT2_INODE_SIZE(sb) == 0) | |
941 | goto cantfind_ext2; | |
942 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
943 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) | |
944 | goto cantfind_ext2; | |
945 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
946 | sbi->s_inodes_per_block; | |
947 | sbi->s_desc_per_block = sb->s_blocksize / | |
948 | sizeof (struct ext2_group_desc); | |
949 | sbi->s_sbh = bh; | |
950 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
951 | sbi->s_addr_per_block_bits = | |
952 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); | |
953 | sbi->s_desc_per_block_bits = | |
954 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); | |
955 | ||
956 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
957 | goto cantfind_ext2; | |
958 | ||
959 | if (sb->s_blocksize != bh->b_size) { | |
960 | if (!silent) | |
961 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); | |
962 | goto failed_mount; | |
963 | } | |
964 | ||
965 | if (sb->s_blocksize != sbi->s_frag_size) { | |
966 | ext2_msg(sb, KERN_ERR, | |
967 | "error: fragsize %lu != blocksize %lu" | |
968 | "(not supported yet)", | |
969 | sbi->s_frag_size, sb->s_blocksize); | |
970 | goto failed_mount; | |
971 | } | |
972 | ||
973 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
974 | ext2_msg(sb, KERN_ERR, | |
975 | "error: #blocks per group too big: %lu", | |
976 | sbi->s_blocks_per_group); | |
977 | goto failed_mount; | |
978 | } | |
979 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
980 | ext2_msg(sb, KERN_ERR, | |
981 | "error: #fragments per group too big: %lu", | |
982 | sbi->s_frags_per_group); | |
983 | goto failed_mount; | |
984 | } | |
985 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
986 | ext2_msg(sb, KERN_ERR, | |
987 | "error: #inodes per group too big: %lu", | |
988 | sbi->s_inodes_per_group); | |
989 | goto failed_mount; | |
990 | } | |
991 | ||
992 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
993 | goto cantfind_ext2; | |
994 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - | |
995 | le32_to_cpu(es->s_first_data_block) - 1) | |
996 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
997 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / | |
998 | EXT2_DESC_PER_BLOCK(sb); | |
999 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1000 | if (sbi->s_group_desc == NULL) { | |
1001 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); | |
1002 | goto failed_mount; | |
1003 | } | |
1004 | bgl_lock_init(sbi->s_blockgroup_lock); | |
1005 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); | |
1006 | if (!sbi->s_debts) { | |
1007 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); | |
1008 | goto failed_mount_group_desc; | |
1009 | } | |
1010 | for (i = 0; i < db_count; i++) { | |
1011 | block = descriptor_loc(sb, logic_sb_block, i); | |
1012 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1013 | if (!sbi->s_group_desc[i]) { | |
1014 | for (j = 0; j < i; j++) | |
1015 | brelse (sbi->s_group_desc[j]); | |
1016 | ext2_msg(sb, KERN_ERR, | |
1017 | "error: unable to read group descriptors"); | |
1018 | goto failed_mount_group_desc; | |
1019 | } | |
1020 | } | |
1021 | if (!ext2_check_descriptors (sb)) { | |
1022 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); | |
1023 | goto failed_mount2; | |
1024 | } | |
1025 | sbi->s_gdb_count = db_count; | |
1026 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1027 | spin_lock_init(&sbi->s_next_gen_lock); | |
1028 | ||
1029 | /* per fileystem reservation list head & lock */ | |
1030 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1031 | sbi->s_rsv_window_root = RB_ROOT; | |
1032 | /* | |
1033 | * Add a single, static dummy reservation to the start of the | |
1034 | * reservation window list --- it gives us a placeholder for | |
1035 | * append-at-start-of-list which makes the allocation logic | |
1036 | * _much_ simpler. | |
1037 | */ | |
1038 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1039 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1040 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1041 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1042 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1043 | ||
1044 | err = percpu_counter_init(&sbi->s_freeblocks_counter, | |
1045 | ext2_count_free_blocks(sb)); | |
1046 | if (!err) { | |
1047 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
1048 | ext2_count_free_inodes(sb)); | |
1049 | } | |
1050 | if (!err) { | |
1051 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
1052 | ext2_count_dirs(sb)); | |
1053 | } | |
1054 | if (err) { | |
1055 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); | |
1056 | goto failed_mount3; | |
1057 | } | |
1058 | /* | |
1059 | * set up enough so that it can read an inode | |
1060 | */ | |
1061 | sb->s_op = &ext2_sops; | |
1062 | sb->s_export_op = &ext2_export_ops; | |
1063 | sb->s_xattr = ext2_xattr_handlers; | |
1064 | ||
1065 | #ifdef CONFIG_QUOTA | |
1066 | sb->dq_op = &dquot_operations; | |
1067 | sb->s_qcop = &dquot_quotactl_ops; | |
1068 | #endif | |
1069 | ||
1070 | root = ext2_iget(sb, EXT2_ROOT_INO); | |
1071 | if (IS_ERR(root)) { | |
1072 | ret = PTR_ERR(root); | |
1073 | goto failed_mount3; | |
1074 | } | |
1075 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1076 | iput(root); | |
1077 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); | |
1078 | goto failed_mount3; | |
1079 | } | |
1080 | ||
1081 | sb->s_root = d_alloc_root(root); | |
1082 | if (!sb->s_root) { | |
1083 | iput(root); | |
1084 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); | |
1085 | ret = -ENOMEM; | |
1086 | goto failed_mount3; | |
1087 | } | |
1088 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) | |
1089 | ext2_msg(sb, KERN_WARNING, | |
1090 | "warning: mounting ext3 filesystem as ext2"); | |
1091 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) | |
1092 | sb->s_flags |= MS_RDONLY; | |
1093 | ext2_write_super(sb); | |
1094 | return 0; | |
1095 | ||
1096 | cantfind_ext2: | |
1097 | if (!silent) | |
1098 | ext2_msg(sb, KERN_ERR, | |
1099 | "error: can't find an ext2 filesystem on dev %s.", | |
1100 | sb->s_id); | |
1101 | goto failed_mount; | |
1102 | failed_mount3: | |
1103 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1104 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1105 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1106 | failed_mount2: | |
1107 | for (i = 0; i < db_count; i++) | |
1108 | brelse(sbi->s_group_desc[i]); | |
1109 | failed_mount_group_desc: | |
1110 | kfree(sbi->s_group_desc); | |
1111 | kfree(sbi->s_debts); | |
1112 | failed_mount: | |
1113 | brelse(bh); | |
1114 | failed_sbi: | |
1115 | sb->s_fs_info = NULL; | |
1116 | kfree(sbi->s_blockgroup_lock); | |
1117 | kfree(sbi); | |
1118 | failed_unlock: | |
1119 | return ret; | |
1120 | } | |
1121 | ||
1122 | static void ext2_clear_super_error(struct super_block *sb) | |
1123 | { | |
1124 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1125 | ||
1126 | if (buffer_write_io_error(sbh)) { | |
1127 | /* | |
1128 | * Oh, dear. A previous attempt to write the | |
1129 | * superblock failed. This could happen because the | |
1130 | * USB device was yanked out. Or it could happen to | |
1131 | * be a transient write error and maybe the block will | |
1132 | * be remapped. Nothing we can do but to retry the | |
1133 | * write and hope for the best. | |
1134 | */ | |
1135 | ext2_msg(sb, KERN_ERR, | |
1136 | "previous I/O error to superblock detected\n"); | |
1137 | clear_buffer_write_io_error(sbh); | |
1138 | set_buffer_uptodate(sbh); | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, | |
1143 | int wait) | |
1144 | { | |
1145 | ext2_clear_super_error(sb); | |
1146 | spin_lock(&EXT2_SB(sb)->s_lock); | |
1147 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); | |
1148 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1149 | es->s_wtime = cpu_to_le32(get_seconds()); | |
1150 | /* unlock before we do IO */ | |
1151 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1152 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); | |
1153 | if (wait) | |
1154 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1155 | sb->s_dirt = 0; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * In the second extended file system, it is not necessary to | |
1160 | * write the super block since we use a mapping of the | |
1161 | * disk super block in a buffer. | |
1162 | * | |
1163 | * However, this function is still used to set the fs valid | |
1164 | * flags to 0. We need to set this flag to 0 since the fs | |
1165 | * may have been checked while mounted and e2fsck may have | |
1166 | * set s_state to EXT2_VALID_FS after some corrections. | |
1167 | */ | |
1168 | static int ext2_sync_fs(struct super_block *sb, int wait) | |
1169 | { | |
1170 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1171 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
1172 | ||
1173 | spin_lock(&sbi->s_lock); | |
1174 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { | |
1175 | ext2_debug("setting valid to 0\n"); | |
1176 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1177 | } | |
1178 | spin_unlock(&sbi->s_lock); | |
1179 | ext2_sync_super(sb, es, wait); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | ||
1184 | void ext2_write_super(struct super_block *sb) | |
1185 | { | |
1186 | if (!(sb->s_flags & MS_RDONLY)) | |
1187 | ext2_sync_fs(sb, 1); | |
1188 | else | |
1189 | sb->s_dirt = 0; | |
1190 | } | |
1191 | ||
1192 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1193 | { | |
1194 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1195 | struct ext2_super_block * es; | |
1196 | unsigned long old_mount_opt = sbi->s_mount_opt; | |
1197 | struct ext2_mount_options old_opts; | |
1198 | unsigned long old_sb_flags; | |
1199 | int err; | |
1200 | ||
1201 | spin_lock(&sbi->s_lock); | |
1202 | ||
1203 | /* Store the old options */ | |
1204 | old_sb_flags = sb->s_flags; | |
1205 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1206 | old_opts.s_resuid = sbi->s_resuid; | |
1207 | old_opts.s_resgid = sbi->s_resgid; | |
1208 | ||
1209 | /* | |
1210 | * Allow the "check" option to be passed as a remount option. | |
1211 | */ | |
1212 | if (!parse_options(data, sb)) { | |
1213 | err = -EINVAL; | |
1214 | goto restore_opts; | |
1215 | } | |
1216 | ||
1217 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1218 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1219 | ||
1220 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset | |
1221 | EXT2_MOUNT_XIP if not */ | |
1222 | ||
1223 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { | |
1224 | ext2_msg(sb, KERN_WARNING, | |
1225 | "warning: unsupported blocksize for xip"); | |
1226 | err = -EINVAL; | |
1227 | goto restore_opts; | |
1228 | } | |
1229 | ||
1230 | es = sbi->s_es; | |
1231 | if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) { | |
1232 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " | |
1233 | "xip flag with busy inodes while remounting"); | |
1234 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; | |
1235 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; | |
1236 | } | |
1237 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { | |
1238 | spin_unlock(&sbi->s_lock); | |
1239 | return 0; | |
1240 | } | |
1241 | if (*flags & MS_RDONLY) { | |
1242 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
1243 | !(sbi->s_mount_state & EXT2_VALID_FS)) { | |
1244 | spin_unlock(&sbi->s_lock); | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * OK, we are remounting a valid rw partition rdonly, so set | |
1250 | * the rdonly flag and then mark the partition as valid again. | |
1251 | */ | |
1252 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1253 | es->s_mtime = cpu_to_le32(get_seconds()); | |
1254 | spin_unlock(&sbi->s_lock); | |
1255 | ||
1256 | err = dquot_suspend(sb, -1); | |
1257 | if (err < 0) { | |
1258 | spin_lock(&sbi->s_lock); | |
1259 | goto restore_opts; | |
1260 | } | |
1261 | ||
1262 | ext2_sync_super(sb, es, 1); | |
1263 | } else { | |
1264 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1265 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1266 | if (ret) { | |
1267 | ext2_msg(sb, KERN_WARNING, | |
1268 | "warning: couldn't remount RDWR because of " | |
1269 | "unsupported optional features (%x).", | |
1270 | le32_to_cpu(ret)); | |
1271 | err = -EROFS; | |
1272 | goto restore_opts; | |
1273 | } | |
1274 | /* | |
1275 | * Mounting a RDONLY partition read-write, so reread and | |
1276 | * store the current valid flag. (It may have been changed | |
1277 | * by e2fsck since we originally mounted the partition.) | |
1278 | */ | |
1279 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1280 | if (!ext2_setup_super (sb, es, 0)) | |
1281 | sb->s_flags &= ~MS_RDONLY; | |
1282 | spin_unlock(&sbi->s_lock); | |
1283 | ||
1284 | ext2_write_super(sb); | |
1285 | ||
1286 | dquot_resume(sb, -1); | |
1287 | } | |
1288 | ||
1289 | return 0; | |
1290 | restore_opts: | |
1291 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1292 | sbi->s_resuid = old_opts.s_resuid; | |
1293 | sbi->s_resgid = old_opts.s_resgid; | |
1294 | sb->s_flags = old_sb_flags; | |
1295 | spin_unlock(&sbi->s_lock); | |
1296 | return err; | |
1297 | } | |
1298 | ||
1299 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) | |
1300 | { | |
1301 | struct super_block *sb = dentry->d_sb; | |
1302 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1303 | struct ext2_super_block *es = sbi->s_es; | |
1304 | u64 fsid; | |
1305 | ||
1306 | spin_lock(&sbi->s_lock); | |
1307 | ||
1308 | if (test_opt (sb, MINIX_DF)) | |
1309 | sbi->s_overhead_last = 0; | |
1310 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1311 | unsigned long i, overhead = 0; | |
1312 | smp_rmb(); | |
1313 | ||
1314 | /* | |
1315 | * Compute the overhead (FS structures). This is constant | |
1316 | * for a given filesystem unless the number of block groups | |
1317 | * changes so we cache the previous value until it does. | |
1318 | */ | |
1319 | ||
1320 | /* | |
1321 | * All of the blocks before first_data_block are | |
1322 | * overhead | |
1323 | */ | |
1324 | overhead = le32_to_cpu(es->s_first_data_block); | |
1325 | ||
1326 | /* | |
1327 | * Add the overhead attributed to the superblock and | |
1328 | * block group descriptors. If the sparse superblocks | |
1329 | * feature is turned on, then not all groups have this. | |
1330 | */ | |
1331 | for (i = 0; i < sbi->s_groups_count; i++) | |
1332 | overhead += ext2_bg_has_super(sb, i) + | |
1333 | ext2_bg_num_gdb(sb, i); | |
1334 | ||
1335 | /* | |
1336 | * Every block group has an inode bitmap, a block | |
1337 | * bitmap, and an inode table. | |
1338 | */ | |
1339 | overhead += (sbi->s_groups_count * | |
1340 | (2 + sbi->s_itb_per_group)); | |
1341 | sbi->s_overhead_last = overhead; | |
1342 | smp_wmb(); | |
1343 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1344 | } | |
1345 | ||
1346 | buf->f_type = EXT2_SUPER_MAGIC; | |
1347 | buf->f_bsize = sb->s_blocksize; | |
1348 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; | |
1349 | buf->f_bfree = ext2_count_free_blocks(sb); | |
1350 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); | |
1351 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); | |
1352 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1353 | buf->f_bavail = 0; | |
1354 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
1355 | buf->f_ffree = ext2_count_free_inodes(sb); | |
1356 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); | |
1357 | buf->f_namelen = EXT2_NAME_LEN; | |
1358 | fsid = le64_to_cpup((void *)es->s_uuid) ^ | |
1359 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1360 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1361 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
1362 | spin_unlock(&sbi->s_lock); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static struct dentry *ext2_mount(struct file_system_type *fs_type, | |
1367 | int flags, const char *dev_name, void *data) | |
1368 | { | |
1369 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); | |
1370 | } | |
1371 | ||
1372 | #ifdef CONFIG_QUOTA | |
1373 | ||
1374 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1375 | * acquiring the locks... As quota files are never truncated and quota code | |
1376 | * itself serializes the operations (and noone else should touch the files) | |
1377 | * we don't have to be afraid of races */ | |
1378 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1379 | size_t len, loff_t off) | |
1380 | { | |
1381 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1382 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1383 | int err = 0; | |
1384 | int offset = off & (sb->s_blocksize - 1); | |
1385 | int tocopy; | |
1386 | size_t toread; | |
1387 | struct buffer_head tmp_bh; | |
1388 | struct buffer_head *bh; | |
1389 | loff_t i_size = i_size_read(inode); | |
1390 | ||
1391 | if (off > i_size) | |
1392 | return 0; | |
1393 | if (off+len > i_size) | |
1394 | len = i_size-off; | |
1395 | toread = len; | |
1396 | while (toread > 0) { | |
1397 | tocopy = sb->s_blocksize - offset < toread ? | |
1398 | sb->s_blocksize - offset : toread; | |
1399 | ||
1400 | tmp_bh.b_state = 0; | |
1401 | tmp_bh.b_size = sb->s_blocksize; | |
1402 | err = ext2_get_block(inode, blk, &tmp_bh, 0); | |
1403 | if (err < 0) | |
1404 | return err; | |
1405 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1406 | memset(data, 0, tocopy); | |
1407 | else { | |
1408 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1409 | if (!bh) | |
1410 | return -EIO; | |
1411 | memcpy(data, bh->b_data+offset, tocopy); | |
1412 | brelse(bh); | |
1413 | } | |
1414 | offset = 0; | |
1415 | toread -= tocopy; | |
1416 | data += tocopy; | |
1417 | blk++; | |
1418 | } | |
1419 | return len; | |
1420 | } | |
1421 | ||
1422 | /* Write to quotafile */ | |
1423 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1424 | const char *data, size_t len, loff_t off) | |
1425 | { | |
1426 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1427 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1428 | int err = 0; | |
1429 | int offset = off & (sb->s_blocksize - 1); | |
1430 | int tocopy; | |
1431 | size_t towrite = len; | |
1432 | struct buffer_head tmp_bh; | |
1433 | struct buffer_head *bh; | |
1434 | ||
1435 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); | |
1436 | while (towrite > 0) { | |
1437 | tocopy = sb->s_blocksize - offset < towrite ? | |
1438 | sb->s_blocksize - offset : towrite; | |
1439 | ||
1440 | tmp_bh.b_state = 0; | |
1441 | err = ext2_get_block(inode, blk, &tmp_bh, 1); | |
1442 | if (err < 0) | |
1443 | goto out; | |
1444 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1445 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1446 | else | |
1447 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
1448 | if (!bh) { | |
1449 | err = -EIO; | |
1450 | goto out; | |
1451 | } | |
1452 | lock_buffer(bh); | |
1453 | memcpy(bh->b_data+offset, data, tocopy); | |
1454 | flush_dcache_page(bh->b_page); | |
1455 | set_buffer_uptodate(bh); | |
1456 | mark_buffer_dirty(bh); | |
1457 | unlock_buffer(bh); | |
1458 | brelse(bh); | |
1459 | offset = 0; | |
1460 | towrite -= tocopy; | |
1461 | data += tocopy; | |
1462 | blk++; | |
1463 | } | |
1464 | out: | |
1465 | if (len == towrite) { | |
1466 | mutex_unlock(&inode->i_mutex); | |
1467 | return err; | |
1468 | } | |
1469 | if (inode->i_size < off+len-towrite) | |
1470 | i_size_write(inode, off+len-towrite); | |
1471 | inode->i_version++; | |
1472 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1473 | mark_inode_dirty(inode); | |
1474 | mutex_unlock(&inode->i_mutex); | |
1475 | return len - towrite; | |
1476 | } | |
1477 | ||
1478 | #endif | |
1479 | ||
1480 | static struct file_system_type ext2_fs_type = { | |
1481 | .owner = THIS_MODULE, | |
1482 | .name = "ext2", | |
1483 | .mount = ext2_mount, | |
1484 | .kill_sb = kill_block_super, | |
1485 | .fs_flags = FS_REQUIRES_DEV, | |
1486 | }; | |
1487 | ||
1488 | static int __init init_ext2_fs(void) | |
1489 | { | |
1490 | int err = init_ext2_xattr(); | |
1491 | if (err) | |
1492 | return err; | |
1493 | err = init_inodecache(); | |
1494 | if (err) | |
1495 | goto out1; | |
1496 | err = register_filesystem(&ext2_fs_type); | |
1497 | if (err) | |
1498 | goto out; | |
1499 | return 0; | |
1500 | out: | |
1501 | destroy_inodecache(); | |
1502 | out1: | |
1503 | exit_ext2_xattr(); | |
1504 | return err; | |
1505 | } | |
1506 | ||
1507 | static void __exit exit_ext2_fs(void) | |
1508 | { | |
1509 | unregister_filesystem(&ext2_fs_type); | |
1510 | destroy_inodecache(); | |
1511 | exit_ext2_xattr(); | |
1512 | } | |
1513 | ||
1514 | module_init(init_ext2_fs) | |
1515 | module_exit(exit_ext2_fs) |