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ext2: add support for extent_map library
[linux-2.6-block.git] / fs / ext2 / super.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 19#include <linux/module.h>
20#include <linux/string.h>
8fc2751b 21#include <linux/fs.h>
1da177e4
LT		 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>
a5694255 28#include <linux/exportfs.h>
1da177e4
LT		 29#include <linux/smp_lock.h>
30#include <linux/vfs.h>
8fc2751b
MB		 31#include <linux/seq_file.h>
32#include <linux/mount.h>
d8ea6cf8 33#include <linux/log2.h>
74abb989 34#include <linux/quotaops.h>
1da177e4
LT		 35#include <asm/uaccess.h>
36#include "ext2.h"
37#include "xattr.h"
38#include "acl.h"
6d79125b 39#include "xip.h"
1da177e4
LT		 40
41static void ext2_sync_super(struct super_block *sb,
42 struct ext2_super_block *es);
43static int ext2_remount (struct super_block * sb, int * flags, char * data);
726c3342 44static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
1da177e4
LT		 45
46void 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 sbi->s_mount_state |= EXT2_ERROR_FS;
31f68e13 55 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
1da177e4
LT		 56 ext2_sync_super(sb, es);
57 }
58
59 va_start(args, fmt);
60 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
61 vprintk(fmt, args);
62 printk("\n");
63 va_end(args);
64
65 if (test_opt(sb, ERRORS_PANIC))
66 panic("EXT2-fs panic from previous error\n");
67 if (test_opt(sb, ERRORS_RO)) {
68 printk("Remounting filesystem read-only\n");
69 sb->s_flags |= MS_RDONLY;
70 }
71}
72
73void ext2_warning (struct super_block * sb, const char * function,
74 const char * fmt, ...)
75{
76 va_list args;
77
78 va_start(args, fmt);
79 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
80 sb->s_id, function);
81 vprintk(fmt, args);
82 printk("\n");
83 va_end(args);
84}
85
86void ext2_update_dynamic_rev(struct super_block *sb)
87{
88 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
89
90 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
91 return;
92
605afd60 93 ext2_warning(sb, __func__,
1da177e4
LT		 94 "updating to rev %d because of new feature flag, "
95 "running e2fsck is recommended",
96 EXT2_DYNAMIC_REV);
97
98 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
99 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
100 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
101 /* leave es->s_feature_*compat flags alone */
102 /* es->s_uuid will be set by e2fsck if empty */
103
104 /*
105 * The rest of the superblock fields should be zero, and if not it
106 * means they are likely already in use, so leave them alone. We
107 * can leave it up to e2fsck to clean up any inconsistencies there.
108 */
109}
110
111static void ext2_put_super (struct super_block * sb)
112{
113 int db_count;
114 int i;
115 struct ext2_sb_info *sbi = EXT2_SB(sb);
116
117 ext2_xattr_put_super(sb);
118 if (!(sb->s_flags & MS_RDONLY)) {
119 struct ext2_super_block *es = sbi->s_es;
120
121 es->s_state = cpu_to_le16(sbi->s_mount_state);
122 ext2_sync_super(sb, es);
123 }
124 db_count = sbi->s_gdb_count;
125 for (i = 0; i < db_count; i++)
126 if (sbi->s_group_desc[i])
127 brelse (sbi->s_group_desc[i]);
128 kfree(sbi->s_group_desc);
129 kfree(sbi->s_debts);
130 percpu_counter_destroy(&sbi->s_freeblocks_counter);
131 percpu_counter_destroy(&sbi->s_freeinodes_counter);
132 percpu_counter_destroy(&sbi->s_dirs_counter);
133 brelse (sbi->s_sbh);
134 sb->s_fs_info = NULL;
18a82eb9 135 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 136 kfree(sbi);
137
138 return;
139}
140
e18b890b 141static struct kmem_cache * ext2_inode_cachep;
1da177e4
LT		 142
143static struct inode *ext2_alloc_inode(struct super_block *sb)
144{
145 struct ext2_inode_info *ei;
e94b1766 146 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
1da177e4
LT		 147 if (!ei)
148 return NULL;
149#ifdef CONFIG_EXT2_FS_POSIX_ACL
150 ei->i_acl = EXT2_ACL_NOT_CACHED;
151 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
152#endif
a686cd89 153 ei->i_block_alloc_info = NULL;
1da177e4
LT		 154 ei->vfs_inode.i_version = 1;
155 return &ei->vfs_inode;
156}
157
158static void ext2_destroy_inode(struct inode *inode)
159{
352b70c1 160 remove_extent_mappings(&EXT2_I(inode)->extent_tree, 0, (u64)-1);
1da177e4
LT		 161 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
162}
163
51cc5068 164static void init_once(void *foo)
1da177e4
LT		 165{
166 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
167
a35afb83 168 rwlock_init(&ei->i_meta_lock);
1da177e4 169#ifdef CONFIG_EXT2_FS_XATTR
a35afb83 170 init_rwsem(&ei->xattr_sem);
1da177e4 171#endif
a686cd89 172 mutex_init(&ei->truncate_mutex);
352b70c1 173 extent_map_tree_init(&ei->extent_tree);
a35afb83 174 inode_init_once(&ei->vfs_inode);
1da177e4 175}
20c2df83 176
1da177e4
LT		 177static int init_inodecache(void)
178{
179 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
180 sizeof(struct ext2_inode_info),
fffb60f9
PJ		 181 0, (SLAB_RECLAIM_ACCOUNT|
182 SLAB_MEM_SPREAD),
20c2df83 183 init_once);
1da177e4
LT		 184 if (ext2_inode_cachep == NULL)
185 return -ENOMEM;
186 return 0;
187}
188
189static void destroy_inodecache(void)
190{
1a1d92c1 191 kmem_cache_destroy(ext2_inode_cachep);
1da177e4
LT		 192}
193
194static void ext2_clear_inode(struct inode *inode)
195{
a686cd89 196 struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info;
1da177e4
LT		 197#ifdef CONFIG_EXT2_FS_POSIX_ACL
198 struct ext2_inode_info *ei = EXT2_I(inode);
199
200 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
201 posix_acl_release(ei->i_acl);
202 ei->i_acl = EXT2_ACL_NOT_CACHED;
203 }
204 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
205 posix_acl_release(ei->i_default_acl);
206 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
207 }
208#endif
a686cd89
MB		 209 ext2_discard_reservation(inode);
210 EXT2_I(inode)->i_block_alloc_info = NULL;
211 if (unlikely(rsv))
212 kfree(rsv);
1da177e4
LT		 213}
214
8fc2751b
MB		 215static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
216{
93d44cb2
MS		 217 struct super_block *sb = vfs->mnt_sb;
218 struct ext2_sb_info *sbi = EXT2_SB(sb);
219 struct ext2_super_block *es = sbi->s_es;
220 unsigned long def_mount_opts;
8fc2751b 221
93d44cb2
MS		 222 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
223
224 if (sbi->s_sb_block != 1)
225 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
226 if (test_opt(sb, MINIX_DF))
227 seq_puts(seq, ",minixdf");
228 if (test_opt(sb, GRPID))
8fc2751b 229 seq_puts(seq, ",grpid");
93d44cb2
MS		 230 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
231 seq_puts(seq, ",nogrpid");
232 if (sbi->s_resuid != EXT2_DEF_RESUID ||
233 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
234 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
235 }
236 if (sbi->s_resgid != EXT2_DEF_RESGID ||
237 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
238 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
239 }
14e11e10 240 if (test_opt(sb, ERRORS_RO)) {
93d44cb2
MS		 241 int def_errors = le16_to_cpu(es->s_errors);
242
243 if (def_errors == EXT2_ERRORS_PANIC ||
14e11e10
AK		 244 def_errors == EXT2_ERRORS_CONTINUE) {
245 seq_puts(seq, ",errors=remount-ro");
93d44cb2
MS		 246 }
247 }
14e11e10
AK		 248 if (test_opt(sb, ERRORS_CONT))
249 seq_puts(seq, ",errors=continue");
93d44cb2
MS		 250 if (test_opt(sb, ERRORS_PANIC))
251 seq_puts(seq, ",errors=panic");
252 if (test_opt(sb, NO_UID32))
253 seq_puts(seq, ",nouid32");
254 if (test_opt(sb, DEBUG))
255 seq_puts(seq, ",debug");
256 if (test_opt(sb, OLDALLOC))
257 seq_puts(seq, ",oldalloc");
258
259#ifdef CONFIG_EXT2_FS_XATTR
260 if (test_opt(sb, XATTR_USER))
261 seq_puts(seq, ",user_xattr");
262 if (!test_opt(sb, XATTR_USER) &&
263 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
264 seq_puts(seq, ",nouser_xattr");
265 }
266#endif
267
268#ifdef CONFIG_EXT2_FS_POSIX_ACL
269 if (test_opt(sb, POSIX_ACL))
270 seq_puts(seq, ",acl");
271 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
272 seq_puts(seq, ",noacl");
273#endif
274
275 if (test_opt(sb, NOBH))
276 seq_puts(seq, ",nobh");
8fc2751b
MB		 277
278#if defined(CONFIG_QUOTA)
279 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
280 seq_puts(seq, ",usrquota");
281
282 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
283 seq_puts(seq, ",grpquota");
284#endif
285
83541796
CO		 286#if defined(CONFIG_EXT2_FS_XIP)
287 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
288 seq_puts(seq, ",xip");
289#endif
290
35c879dc
MS		 291 if (!test_opt(sb, RESERVATION))
292 seq_puts(seq, ",noreservation");
293
8fc2751b
MB		 294 return 0;
295}
296
1da177e4
LT		 297#ifdef CONFIG_QUOTA
298static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
299static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
300#endif
301
ee9b6d61 302static const struct super_operations ext2_sops = {
1da177e4
LT		 303 .alloc_inode = ext2_alloc_inode,
304 .destroy_inode = ext2_destroy_inode,
1da177e4
LT		 305 .write_inode = ext2_write_inode,
306 .delete_inode = ext2_delete_inode,
307 .put_super = ext2_put_super,
308 .write_super = ext2_write_super,
309 .statfs = ext2_statfs,
310 .remount_fs = ext2_remount,
311 .clear_inode = ext2_clear_inode,
8fc2751b 312 .show_options = ext2_show_options,
1da177e4
LT		 313#ifdef CONFIG_QUOTA
314 .quota_read = ext2_quota_read,
315 .quota_write = ext2_quota_write,
316#endif
317};
318
2e4c68e3
CH		 319static struct inode *ext2_nfs_get_inode(struct super_block *sb,
320 u64 ino, u32 generation)
ecaff756 321{
ecaff756 322 struct inode *inode;
ecaff756
N		 323
324 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
325 return ERR_PTR(-ESTALE);
326 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
327 return ERR_PTR(-ESTALE);
328
329 /* iget isn't really right if the inode is currently unallocated!!
330 * ext2_read_inode currently does appropriate checks, but
331 * it might be "neater" to call ext2_get_inode first and check
332 * if the inode is valid.....
333 */
52fcf703
DH		 334 inode = ext2_iget(sb, ino);
335 if (IS_ERR(inode))
336 return ERR_CAST(inode);
337 if (generation && inode->i_generation != generation) {
ecaff756
N		 338 /* we didn't find the right inode.. */
339 iput(inode);
340 return ERR_PTR(-ESTALE);
341 }
2e4c68e3
CH		 342 return inode;
343}
344
345static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
346 int fh_len, int fh_type)
347{
348 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
349 ext2_nfs_get_inode);
350}
351
352static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
353 int fh_len, int fh_type)
354{
355 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
356 ext2_nfs_get_inode);
ecaff756
N		 357}
358
1da177e4
LT		 359/* Yes, most of these are left as NULL!!
360 * A NULL value implies the default, which works with ext2-like file
361 * systems, but can be improved upon.
362 * Currently only get_parent is required.
363 */
39655164 364static const struct export_operations ext2_export_ops = {
2e4c68e3
CH		 365 .fh_to_dentry = ext2_fh_to_dentry,
366 .fh_to_parent = ext2_fh_to_parent,
1da177e4
LT		 367 .get_parent = ext2_get_parent,
368};
369
370static unsigned long get_sb_block(void **data)
371{
372 unsigned long sb_block;
373 char *options = (char *) *data;
374
375 if (!options || strncmp(options, "sb=", 3) != 0)
376 return 1; /* Default location */
377 options += 3;
378 sb_block = simple_strtoul(options, &options, 0);
379 if (*options && *options != ',') {
380 printk("EXT2-fs: Invalid sb specification: %s\n",
381 (char *) *data);
382 return 1;
383 }
384 if (*options == ',')
385 options++;
386 *data = (void *) options;
387 return sb_block;
388}
389
390enum {
391 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
8fc2751b 392 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
2860b733 393 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
8fc2751b
MB		 394 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
395 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
a686cd89 396 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
1da177e4
LT		 397};
398
a447c093 399static const match_table_t tokens = {
1da177e4
LT		 400 {Opt_bsd_df, "bsddf"},
401 {Opt_minix_df, "minixdf"},
402 {Opt_grpid, "grpid"},
403 {Opt_grpid, "bsdgroups"},
404 {Opt_nogrpid, "nogrpid"},
405 {Opt_nogrpid, "sysvgroups"},
406 {Opt_resgid, "resgid=%u"},
407 {Opt_resuid, "resuid=%u"},
408 {Opt_sb, "sb=%u"},
409 {Opt_err_cont, "errors=continue"},
410 {Opt_err_panic, "errors=panic"},
411 {Opt_err_ro, "errors=remount-ro"},
412 {Opt_nouid32, "nouid32"},
413 {Opt_nocheck, "check=none"},
414 {Opt_nocheck, "nocheck"},
1da177e4
LT		 415 {Opt_debug, "debug"},
416 {Opt_oldalloc, "oldalloc"},
417 {Opt_orlov, "orlov"},
418 {Opt_nobh, "nobh"},
419 {Opt_user_xattr, "user_xattr"},
420 {Opt_nouser_xattr, "nouser_xattr"},
421 {Opt_acl, "acl"},
422 {Opt_noacl, "noacl"},
6d79125b 423 {Opt_xip, "xip"},
8fc2751b 424 {Opt_grpquota, "grpquota"},
1da177e4 425 {Opt_ignore, "noquota"},
8fc2751b
MB		 426 {Opt_quota, "quota"},
427 {Opt_usrquota, "usrquota"},
a686cd89
MB		 428 {Opt_reservation, "reservation"},
429 {Opt_noreservation, "noreservation"},
1da177e4
LT		 430 {Opt_err, NULL}
431};
432
433static int parse_options (char * options,
434 struct ext2_sb_info *sbi)
435{
436 char * p;
437 substring_t args[MAX_OPT_ARGS];
1da177e4
LT		 438 int option;
439
440 if (!options)
441 return 1;
442
443 while ((p = strsep (&options, ",")) != NULL) {
444 int token;
445 if (!*p)
446 continue;
447
448 token = match_token(p, tokens, args);
449 switch (token) {
450 case Opt_bsd_df:
451 clear_opt (sbi->s_mount_opt, MINIX_DF);
452 break;
453 case Opt_minix_df:
454 set_opt (sbi->s_mount_opt, MINIX_DF);
455 break;
456 case Opt_grpid:
457 set_opt (sbi->s_mount_opt, GRPID);
458 break;
459 case Opt_nogrpid:
460 clear_opt (sbi->s_mount_opt, GRPID);
461 break;
462 case Opt_resuid:
463 if (match_int(&args[0], &option))
464 return 0;
465 sbi->s_resuid = option;
466 break;
467 case Opt_resgid:
468 if (match_int(&args[0], &option))
469 return 0;
470 sbi->s_resgid = option;
471 break;
472 case Opt_sb:
473 /* handled by get_sb_block() instead of here */
474 /* *sb_block = match_int(&args[0]); */
475 break;
476 case Opt_err_panic:
5a2b4062
VA		 477 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
478 clear_opt (sbi->s_mount_opt, ERRORS_RO);
479 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1da177e4
LT		 480 break;
481 case Opt_err_ro:
5a2b4062
VA		 482 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
483 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
484 set_opt (sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 485 break;
486 case Opt_err_cont:
5a2b4062
VA		 487 clear_opt (sbi->s_mount_opt, ERRORS_RO);
488 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
489 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1da177e4
LT		 490 break;
491 case Opt_nouid32:
492 set_opt (sbi->s_mount_opt, NO_UID32);
493 break;
1da177e4
LT		 494 case Opt_nocheck:
495 clear_opt (sbi->s_mount_opt, CHECK);
496 break;
497 case Opt_debug:
498 set_opt (sbi->s_mount_opt, DEBUG);
499 break;
500 case Opt_oldalloc:
501 set_opt (sbi->s_mount_opt, OLDALLOC);
502 break;
503 case Opt_orlov:
504 clear_opt (sbi->s_mount_opt, OLDALLOC);
505 break;
506 case Opt_nobh:
507 set_opt (sbi->s_mount_opt, NOBH);
508 break;
509#ifdef CONFIG_EXT2_FS_XATTR
510 case Opt_user_xattr:
511 set_opt (sbi->s_mount_opt, XATTR_USER);
512 break;
513 case Opt_nouser_xattr:
514 clear_opt (sbi->s_mount_opt, XATTR_USER);
515 break;
516#else
517 case Opt_user_xattr:
518 case Opt_nouser_xattr:
519 printk("EXT2 (no)user_xattr options not supported\n");
520 break;
521#endif
522#ifdef CONFIG_EXT2_FS_POSIX_ACL
523 case Opt_acl:
524 set_opt(sbi->s_mount_opt, POSIX_ACL);
525 break;
526 case Opt_noacl:
527 clear_opt(sbi->s_mount_opt, POSIX_ACL);
528 break;
529#else
530 case Opt_acl:
531 case Opt_noacl:
532 printk("EXT2 (no)acl options not supported\n");
533 break;
534#endif
6d79125b
CO		 535 case Opt_xip:
536#ifdef CONFIG_EXT2_FS_XIP
537 set_opt (sbi->s_mount_opt, XIP);
538#else
539 printk("EXT2 xip option not supported\n");
540#endif
541 break;
8fc2751b
MB		 542
543#if defined(CONFIG_QUOTA)
544 case Opt_quota:
545 case Opt_usrquota:
546 set_opt(sbi->s_mount_opt, USRQUOTA);
547 break;
548
549 case Opt_grpquota:
550 set_opt(sbi->s_mount_opt, GRPQUOTA);
551 break;
552#else
553 case Opt_quota:
554 case Opt_usrquota:
555 case Opt_grpquota:
556 printk(KERN_ERR
557 "EXT2-fs: quota operations not supported.\n");
558
559 break;
560#endif
561
a686cd89
MB		 562 case Opt_reservation:
563 set_opt(sbi->s_mount_opt, RESERVATION);
564 printk("reservations ON\n");
565 break;
566 case Opt_noreservation:
567 clear_opt(sbi->s_mount_opt, RESERVATION);
568 printk("reservations OFF\n");
569 break;
1da177e4
LT		 570 case Opt_ignore:
571 break;
572 default:
573 return 0;
574 }
575 }
1da177e4
LT		 576 return 1;
577}
578
579static int ext2_setup_super (struct super_block * sb,
580 struct ext2_super_block * es,
581 int read_only)
582{
583 int res = 0;
584 struct ext2_sb_info *sbi = EXT2_SB(sb);
585
586 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
587 printk ("EXT2-fs warning: revision level too high, "
588 "forcing read-only mode\n");
589 res = MS_RDONLY;
590 }
591 if (read_only)
592 return res;
593 if (!(sbi->s_mount_state & EXT2_VALID_FS))
594 printk ("EXT2-fs warning: mounting unchecked fs, "
595 "running e2fsck is recommended\n");
596 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
597 printk ("EXT2-fs warning: mounting fs with errors, "
598 "running e2fsck is recommended\n");
599 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
600 le16_to_cpu(es->s_mnt_count) >=
601 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
602 printk ("EXT2-fs warning: maximal mount count reached, "
603 "running e2fsck is recommended\n");
604 else if (le32_to_cpu(es->s_checkinterval) &&
605 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
606 printk ("EXT2-fs warning: checktime reached, "
607 "running e2fsck is recommended\n");
608 if (!le16_to_cpu(es->s_max_mnt_count))
609 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
fba4d399 610 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 611 ext2_write_super(sb);
612 if (test_opt (sb, DEBUG))
613 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
614 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
615 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
616 sbi->s_frag_size,
617 sbi->s_groups_count,
618 EXT2_BLOCKS_PER_GROUP(sb),
619 EXT2_INODES_PER_GROUP(sb),
620 sbi->s_mount_opt);
1da177e4
LT		 621 return res;
622}
623
197cd65a 624static int ext2_check_descriptors(struct super_block *sb)
1da177e4
LT		 625{
626 int i;
1da177e4 627 struct ext2_sb_info *sbi = EXT2_SB(sb);
1da177e4
LT		 628
629 ext2_debug ("Checking group descriptors");
630
197cd65a
AM		 631 for (i = 0; i < sbi->s_groups_count; i++) {
632 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
24097d12
AM		 633 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
634 ext2_fsblk_t last_block;
197cd65a 635
41f04d85
ES		 636 if (i == sbi->s_groups_count - 1)
637 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
638 else
639 last_block = first_block +
640 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
641
41f04d85
ES		 642 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
643 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 644 {
645 ext2_error (sb, "ext2_check_descriptors",
646 "Block bitmap for group %d"
647 " not in group (block %lu)!",
648 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
649 return 0;
650 }
41f04d85
ES		 651 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
652 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 653 {
654 ext2_error (sb, "ext2_check_descriptors",
655 "Inode bitmap for group %d"
656 " not in group (block %lu)!",
657 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
658 return 0;
659 }
41f04d85 660 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 661 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
41f04d85 662 last_block)
1da177e4
LT		 663 {
664 ext2_error (sb, "ext2_check_descriptors",
665 "Inode table for group %d"
666 " not in group (block %lu)!",
667 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
668 return 0;
669 }
1da177e4
LT		 670 }
671 return 1;
672}
673
1da177e4
LT		 674/*
675 * Maximal file size. There is a direct, and {,double-,triple-}indirect
676 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
677 * We need to be 1 filesystem block less than the 2^32 sector limit.
678 */
679static loff_t ext2_max_size(int bits)
680{
681 loff_t res = EXT2_NDIR_BLOCKS;
902be4c5
AK		 682 int meta_blocks;
683 loff_t upper_limit;
684
685 /* This is calculated to be the largest file size for a
686 * dense, file such that the total number of
1da177e4 687 * sectors in the file, including data and all indirect blocks,
902be4c5
AK		 688 * does not exceed 2^32 -1
689 * __u32 i_blocks representing the total number of
690 * 512 bytes blocks of the file
691 */
692 upper_limit = (1LL << 32) - 1;
693
694 /* total blocks in file system block size */
695 upper_limit >>= (bits - 9);
696
697
698 /* indirect blocks */
699 meta_blocks = 1;
700 /* double indirect blocks */
701 meta_blocks += 1 + (1LL << (bits-2));
702 /* tripple indirect blocks */
703 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
704
705 upper_limit -= meta_blocks;
706 upper_limit <<= bits;
1da177e4
LT		 707
708 res += 1LL << (bits-2);
709 res += 1LL << (2*(bits-2));
710 res += 1LL << (3*(bits-2));
711 res <<= bits;
712 if (res > upper_limit)
713 res = upper_limit;
902be4c5
AK		 714
715 if (res > MAX_LFS_FILESIZE)
716 res = MAX_LFS_FILESIZE;
717
1da177e4
LT		 718 return res;
719}
720
721static unsigned long descriptor_loc(struct super_block *sb,
722 unsigned long logic_sb_block,
723 int nr)
724{
725 struct ext2_sb_info *sbi = EXT2_SB(sb);
24097d12 726 unsigned long bg, first_meta_bg;
1da177e4
LT		 727 int has_super = 0;
728
1da177e4
LT		 729 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
730
731 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
732 nr < first_meta_bg)
733 return (logic_sb_block + nr + 1);
734 bg = sbi->s_desc_per_block * nr;
735 if (ext2_bg_has_super(sb, bg))
736 has_super = 1;
24097d12
AM		 737
738 return ext2_group_first_block_no(sb, bg) + has_super;
1da177e4
LT		 739}
740
741static int ext2_fill_super(struct super_block *sb, void *data, int silent)
742{
743 struct buffer_head * bh;
744 struct ext2_sb_info * sbi;
745 struct ext2_super_block * es;
746 struct inode *root;
747 unsigned long block;
748 unsigned long sb_block = get_sb_block(&data);
749 unsigned long logic_sb_block;
750 unsigned long offset = 0;
751 unsigned long def_mount_opts;
52fcf703 752 long ret = -EINVAL;
1da177e4
LT		 753 int blocksize = BLOCK_SIZE;
754 int db_count;
755 int i, j;
756 __le32 features;
833f4077 757 int err;
1da177e4 758
f8314dc6 759 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 760 if (!sbi)
761 return -ENOMEM;
18a82eb9
PE		 762
763 sbi->s_blockgroup_lock =
764 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
765 if (!sbi->s_blockgroup_lock) {
766 kfree(sbi);
767 return -ENOMEM;
768 }
1da177e4 769 sb->s_fs_info = sbi;
93d44cb2 770 sbi->s_sb_block = sb_block;
1da177e4
LT		 771
772 /*
773 * See what the current blocksize for the device is, and
774 * use that as the blocksize. Otherwise (or if the blocksize
775 * is smaller than the default) use the default.
776 * This is important for devices that have a hardware
777 * sectorsize that is larger than the default.
778 */
779 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
780 if (!blocksize) {
781 printk ("EXT2-fs: unable to set blocksize\n");
782 goto failed_sbi;
783 }
784
785 /*
786 * If the superblock doesn't start on a hardware sector boundary,
787 * calculate the offset.
788 */
789 if (blocksize != BLOCK_SIZE) {
790 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
791 offset = (sb_block*BLOCK_SIZE) % blocksize;
792 } else {
793 logic_sb_block = sb_block;
794 }
795
796 if (!(bh = sb_bread(sb, logic_sb_block))) {
797 printk ("EXT2-fs: unable to read superblock\n");
798 goto failed_sbi;
799 }
800 /*
801 * Note: s_es must be initialized as soon as possible because
802 * some ext2 macro-instructions depend on its value
803 */
804 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
805 sbi->s_es = es;
806 sb->s_magic = le16_to_cpu(es->s_magic);
807
808 if (sb->s_magic != EXT2_SUPER_MAGIC)
809 goto cantfind_ext2;
810
811 /* Set defaults before we parse the mount options */
812 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
813 if (def_mount_opts & EXT2_DEFM_DEBUG)
814 set_opt(sbi->s_mount_opt, DEBUG);
815 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
816 set_opt(sbi->s_mount_opt, GRPID);
817 if (def_mount_opts & EXT2_DEFM_UID16)
818 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 819#ifdef CONFIG_EXT2_FS_XATTR
1da177e4
LT		 820 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
821 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 822#endif
823#ifdef CONFIG_EXT2_FS_POSIX_ACL
1da177e4
LT		 824 if (def_mount_opts & EXT2_DEFM_ACL)
825 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 826#endif
1da177e4
LT		 827
828 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
829 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
14e11e10 830 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
5a2b4062 831 set_opt(sbi->s_mount_opt, ERRORS_CONT);
14e11e10
AK		 832 else
833 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 834
835 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
836 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
837
a686cd89
MB		 838 set_opt(sbi->s_mount_opt, RESERVATION);
839
1da177e4
LT		 840 if (!parse_options ((char *) data, sbi))
841 goto failed_mount;
842
843 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
844 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
845 MS_POSIXACL : 0);
846
6d79125b
CO		 847 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
848 EXT2_MOUNT_XIP if not */
849
1da177e4
LT		 850 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
851 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
852 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
853 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
854 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
855 "running e2fsck is recommended\n");
856 /*
857 * Check feature flags regardless of the revision level, since we
858 * previously didn't change the revision level when setting the flags,
859 * so there is a chance incompat flags are set on a rev 0 filesystem.
860 */
861 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
862 if (features) {
863 printk("EXT2-fs: %s: couldn't mount because of "
864 "unsupported optional features (%x).\n",
865 sb->s_id, le32_to_cpu(features));
866 goto failed_mount;
867 }
868 if (!(sb->s_flags & MS_RDONLY) &&
869 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
870 printk("EXT2-fs: %s: couldn't mount RDWR because of "
871 "unsupported optional features (%x).\n",
872 sb->s_id, le32_to_cpu(features));
873 goto failed_mount;
874 }
875
876 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
877
a8e3eff4 878 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
6d79125b
CO		 879 if (!silent)
880 printk("XIP: Unsupported blocksize\n");
881 goto failed_mount;
882 }
883
1da177e4
LT		 884 /* If the blocksize doesn't match, re-read the thing.. */
885 if (sb->s_blocksize != blocksize) {
886 brelse(bh);
887
888 if (!sb_set_blocksize(sb, blocksize)) {
889 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
890 goto failed_sbi;
891 }
892
893 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
894 offset = (sb_block*BLOCK_SIZE) % blocksize;
895 bh = sb_bread(sb, logic_sb_block);
896 if(!bh) {
897 printk("EXT2-fs: Couldn't read superblock on "
898 "2nd try.\n");
899 goto failed_sbi;
900 }
901 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
902 sbi->s_es = es;
903 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
904 printk ("EXT2-fs: Magic mismatch, very weird !\n");
905 goto failed_mount;
906 }
907 }
908
909 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
910
911 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
912 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
913 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
914 } else {
915 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
916 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
917 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
d8ea6cf8 918 !is_power_of_2(sbi->s_inode_size) ||
1da177e4
LT		 919 (sbi->s_inode_size > blocksize)) {
920 printk ("EXT2-fs: unsupported inode size: %d\n",
921 sbi->s_inode_size);
922 goto failed_mount;
923 }
924 }
925
926 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
927 le32_to_cpu(es->s_log_frag_size);
928 if (sbi->s_frag_size == 0)
929 goto cantfind_ext2;
930 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
931
932 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
933 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
934 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
935
936 if (EXT2_INODE_SIZE(sb) == 0)
937 goto cantfind_ext2;
938 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
607eb266 939 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1da177e4
LT		 940 goto cantfind_ext2;
941 sbi->s_itb_per_group = sbi->s_inodes_per_group /
942 sbi->s_inodes_per_block;
943 sbi->s_desc_per_block = sb->s_blocksize /
944 sizeof (struct ext2_group_desc);
945 sbi->s_sbh = bh;
946 sbi->s_mount_state = le16_to_cpu(es->s_state);
947 sbi->s_addr_per_block_bits =
f0d1b0b3 948 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1da177e4 949 sbi->s_desc_per_block_bits =
f0d1b0b3 950 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1da177e4
LT		 951
952 if (sb->s_magic != EXT2_SUPER_MAGIC)
953 goto cantfind_ext2;
954
955 if (sb->s_blocksize != bh->b_size) {
956 if (!silent)
957 printk ("VFS: Unsupported blocksize on dev "
958 "%s.\n", sb->s_id);
959 goto failed_mount;
960 }
961
962 if (sb->s_blocksize != sbi->s_frag_size) {
963 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
964 sbi->s_frag_size, sb->s_blocksize);
965 goto failed_mount;
966 }
967
968 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
969 printk ("EXT2-fs: #blocks per group too big: %lu\n",
970 sbi->s_blocks_per_group);
971 goto failed_mount;
972 }
973 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
974 printk ("EXT2-fs: #fragments per group too big: %lu\n",
975 sbi->s_frags_per_group);
976 goto failed_mount;
977 }
978 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
979 printk ("EXT2-fs: #inodes per group too big: %lu\n",
980 sbi->s_inodes_per_group);
981 goto failed_mount;
982 }
983
984 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
985 goto cantfind_ext2;
41f04d85
ES		 986 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
987 le32_to_cpu(es->s_first_data_block) - 1)
988 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 989 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
990 EXT2_DESC_PER_BLOCK(sb);
991 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
992 if (sbi->s_group_desc == NULL) {
993 printk ("EXT2-fs: not enough memory\n");
994 goto failed_mount;
995 }
18a82eb9 996 bgl_lock_init(sbi->s_blockgroup_lock);
dd00cc48 997 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1da177e4
LT		 998 if (!sbi->s_debts) {
999 printk ("EXT2-fs: not enough memory\n");
1000 goto failed_mount_group_desc;
1001 }
1da177e4
LT		 1002 for (i = 0; i < db_count; i++) {
1003 block = descriptor_loc(sb, logic_sb_block, i);
1004 sbi->s_group_desc[i] = sb_bread(sb, block);
1005 if (!sbi->s_group_desc[i]) {
1006 for (j = 0; j < i; j++)
1007 brelse (sbi->s_group_desc[j]);
1008 printk ("EXT2-fs: unable to read group descriptors\n");
1009 goto failed_mount_group_desc;
1010 }
1011 }
1012 if (!ext2_check_descriptors (sb)) {
1013 printk ("EXT2-fs: group descriptors corrupted!\n");
1da177e4
LT		 1014 goto failed_mount2;
1015 }
1016 sbi->s_gdb_count = db_count;
1017 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1018 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1019
a686cd89
MB		 1020 /* per fileystem reservation list head & lock */
1021 spin_lock_init(&sbi->s_rsv_window_lock);
1022 sbi->s_rsv_window_root = RB_ROOT;
1023 /*
1024 * Add a single, static dummy reservation to the start of the
1025 * reservation window list --- it gives us a placeholder for
1026 * append-at-start-of-list which makes the allocation logic
1027 * _much_ simpler.
1028 */
1029 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1030 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1031 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1032 sbi->s_rsv_window_head.rsv_goal_size = 0;
1033 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1034
833f4077 1035 err = percpu_counter_init(&sbi->s_freeblocks_counter,
0216bfcf 1036 ext2_count_free_blocks(sb));
833f4077
PZ		 1037 if (!err) {
1038 err = percpu_counter_init(&sbi->s_freeinodes_counter,
0216bfcf 1039 ext2_count_free_inodes(sb));
833f4077
PZ		 1040 }
1041 if (!err) {
1042 err = percpu_counter_init(&sbi->s_dirs_counter,
0216bfcf 1043 ext2_count_dirs(sb));
833f4077
PZ		 1044 }
1045 if (err) {
1046 printk(KERN_ERR "EXT2-fs: insufficient memory\n");
1047 goto failed_mount3;
1048 }
1da177e4
LT		 1049 /*
1050 * set up enough so that it can read an inode
1051 */
1052 sb->s_op = &ext2_sops;
1053 sb->s_export_op = &ext2_export_ops;
1054 sb->s_xattr = ext2_xattr_handlers;
52fcf703
DH		 1055 root = ext2_iget(sb, EXT2_ROOT_INO);
1056 if (IS_ERR(root)) {
1057 ret = PTR_ERR(root);
0216bfcf 1058 goto failed_mount3;
1da177e4
LT		 1059 }
1060 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
52fcf703 1061 iput(root);
1da177e4 1062 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
0216bfcf 1063 goto failed_mount3;
1da177e4 1064 }
52fcf703
DH		 1065
1066 sb->s_root = d_alloc_root(root);
1067 if (!sb->s_root) {
1068 iput(root);
1069 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
1070 ret = -ENOMEM;
1071 goto failed_mount3;
1072 }
1da177e4 1073 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
605afd60 1074 ext2_warning(sb, __func__,
ec63f22d 1075 "mounting ext3 filesystem as ext2");
1da177e4 1076 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1da177e4
LT		 1077 return 0;
1078
1079cantfind_ext2:
1080 if (!silent)
1081 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1082 sb->s_id);
1083 goto failed_mount;
0216bfcf
MC		 1084failed_mount3:
1085 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1086 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1087 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 1088failed_mount2:
1089 for (i = 0; i < db_count; i++)
1090 brelse(sbi->s_group_desc[i]);
1091failed_mount_group_desc:
1092 kfree(sbi->s_group_desc);
1093 kfree(sbi->s_debts);
1094failed_mount:
1095 brelse(bh);
1096failed_sbi:
1097 sb->s_fs_info = NULL;
1098 kfree(sbi);
52fcf703 1099 return ret;
1da177e4
LT		 1100}
1101
1102static void ext2_commit_super (struct super_block * sb,
1103 struct ext2_super_block * es)
1104{
1105 es->s_wtime = cpu_to_le32(get_seconds());
1106 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1107 sb->s_dirt = 0;
1108}
1109
1110static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
1111{
1112 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1113 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1114 es->s_wtime = cpu_to_le32(get_seconds());
1115 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1116 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1117 sb->s_dirt = 0;
1118}
1119
1120/*
1121 * In the second extended file system, it is not necessary to
1122 * write the super block since we use a mapping of the
1123 * disk super block in a buffer.
1124 *
1125 * However, this function is still used to set the fs valid
1126 * flags to 0. We need to set this flag to 0 since the fs
1127 * may have been checked while mounted and e2fsck may have
1128 * set s_state to EXT2_VALID_FS after some corrections.
1129 */
1130
1131void ext2_write_super (struct super_block * sb)
1132{
1133 struct ext2_super_block * es;
1134 lock_kernel();
1135 if (!(sb->s_flags & MS_RDONLY)) {
1136 es = EXT2_SB(sb)->s_es;
1137
31f68e13 1138 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1da177e4 1139 ext2_debug ("setting valid to 0\n");
31f68e13 1140 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1da177e4
LT		 1141 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1142 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1143 es->s_mtime = cpu_to_le32(get_seconds());
1144 ext2_sync_super(sb, es);
1145 } else
1146 ext2_commit_super (sb, es);
1147 }
1148 sb->s_dirt = 0;
1149 unlock_kernel();
1150}
1151
1152static int ext2_remount (struct super_block * sb, int * flags, char * data)
1153{
1154 struct ext2_sb_info * sbi = EXT2_SB(sb);
1155 struct ext2_super_block * es;
6d79125b 1156 unsigned long old_mount_opt = sbi->s_mount_opt;
50a52234
JK		 1157 struct ext2_mount_options old_opts;
1158 unsigned long old_sb_flags;
1159 int err;
1160
1161 /* Store the old options */
1162 old_sb_flags = sb->s_flags;
1163 old_opts.s_mount_opt = sbi->s_mount_opt;
1164 old_opts.s_resuid = sbi->s_resuid;
1165 old_opts.s_resgid = sbi->s_resgid;
1da177e4
LT		 1166
1167 /*
1168 * Allow the "check" option to be passed as a remount option.
1169 */
50a52234
JK		 1170 if (!parse_options (data, sbi)) {
1171 err = -EINVAL;
1172 goto restore_opts;
1173 }
1da177e4
LT		 1174
1175 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1176 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1177
266f5aa0
CO		 1178 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1179 EXT2_MOUNT_XIP if not */
1180
1181 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1182 printk("XIP: Unsupported blocksize\n");
ddc80bd7 1183 err = -EINVAL;
266f5aa0
CO		 1184 goto restore_opts;
1185 }
1186
1da177e4 1187 es = sbi->s_es;
6d79125b
CO		 1188 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1189 (old_mount_opt & EXT2_MOUNT_XIP)) &&
0e4a9b59
CO		 1190 invalidate_inodes(sb)) {
1191 ext2_warning(sb, __func__, "refusing change of xip flag "
1192 "with busy inodes while remounting");
1193 sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
1194 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
1195 }
1da177e4
LT		 1196 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1197 return 0;
1198 if (*flags & MS_RDONLY) {
1199 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1200 !(sbi->s_mount_state & EXT2_VALID_FS))
1201 return 0;
1202 /*
1203 * OK, we are remounting a valid rw partition rdonly, so set
1204 * the rdonly flag and then mark the partition as valid again.
1205 */
1206 es->s_state = cpu_to_le16(sbi->s_mount_state);
1207 es->s_mtime = cpu_to_le32(get_seconds());
1208 } else {
1209 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1210 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1211 if (ret) {
1212 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1213 "unsupported optional features (%x).\n",
1214 sb->s_id, le32_to_cpu(ret));
50a52234
JK		 1215 err = -EROFS;
1216 goto restore_opts;
1da177e4
LT		 1217 }
1218 /*
1219 * Mounting a RDONLY partition read-write, so reread and
1220 * store the current valid flag. (It may have been changed
1221 * by e2fsck since we originally mounted the partition.)
1222 */
1223 sbi->s_mount_state = le16_to_cpu(es->s_state);
1224 if (!ext2_setup_super (sb, es, 0))
1225 sb->s_flags &= ~MS_RDONLY;
1226 }
1227 ext2_sync_super(sb, es);
1228 return 0;
50a52234
JK		 1229restore_opts:
1230 sbi->s_mount_opt = old_opts.s_mount_opt;
1231 sbi->s_resuid = old_opts.s_resuid;
1232 sbi->s_resgid = old_opts.s_resgid;
1233 sb->s_flags = old_sb_flags;
1234 return err;
1da177e4
LT		 1235}
1236
726c3342 1237static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 1238{
726c3342 1239 struct super_block *sb = dentry->d_sb;
1da177e4 1240 struct ext2_sb_info *sbi = EXT2_SB(sb);
e4fca01e 1241 struct ext2_super_block *es = sbi->s_es;
e4fca01e 1242 u64 fsid;
1da177e4
LT		 1243
1244 if (test_opt (sb, MINIX_DF))
2235219b
BP		 1245 sbi->s_overhead_last = 0;
1246 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1247 unsigned long i, overhead = 0;
1248 smp_rmb();
1249
1da177e4 1250 /*
2235219b
BP		 1251 * Compute the overhead (FS structures). This is constant
1252 * for a given filesystem unless the number of block groups
1253 * changes so we cache the previous value until it does.
1da177e4
LT		 1254 */
1255
1256 /*
1257 * All of the blocks before first_data_block are
1258 * overhead
1259 */
e4fca01e 1260 overhead = le32_to_cpu(es->s_first_data_block);
1da177e4
LT		 1261
1262 /*
1263 * Add the overhead attributed to the superblock and
1264 * block group descriptors. If the sparse superblocks
1265 * feature is turned on, then not all groups have this.
1266 */
1267 for (i = 0; i < sbi->s_groups_count; i++)
1268 overhead += ext2_bg_has_super(sb, i) +
1269 ext2_bg_num_gdb(sb, i);
1270
1271 /*
1272 * Every block group has an inode bitmap, a block
1273 * bitmap, and an inode table.
1274 */
1275 overhead += (sbi->s_groups_count *
1276 (2 + sbi->s_itb_per_group));
2235219b
BP		 1277 sbi->s_overhead_last = overhead;
1278 smp_wmb();
1279 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 1280 }
1281
1282 buf->f_type = EXT2_SUPER_MAGIC;
1283 buf->f_bsize = sb->s_blocksize;
2235219b 1284 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1da177e4 1285 buf->f_bfree = ext2_count_free_blocks(sb);
2235219b 1286 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
e4fca01e
PE		 1287 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1288 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1da177e4 1289 buf->f_bavail = 0;
e4fca01e
PE		 1290 buf->f_files = le32_to_cpu(es->s_inodes_count);
1291 buf->f_ffree = ext2_count_free_inodes(sb);
2235219b 1292 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1da177e4 1293 buf->f_namelen = EXT2_NAME_LEN;
e4fca01e
PE		 1294 fsid = le64_to_cpup((void *)es->s_uuid) ^
1295 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1296 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1297 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 1298 return 0;
1299}
1300
454e2398
DH		 1301static int ext2_get_sb(struct file_system_type *fs_type,
1302 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 1303{
454e2398 1304 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
1da177e4
LT		 1305}
1306
1307#ifdef CONFIG_QUOTA
1308
1309/* Read data from quotafile - avoid pagecache and such because we cannot afford
1310 * acquiring the locks... As quota files are never truncated and quota code
1311 * itself serializes the operations (and noone else should touch the files)
1312 * we don't have to be afraid of races */
1313static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1314 size_t len, loff_t off)
1315{
1316 struct inode *inode = sb_dqopt(sb)->files[type];
1317 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1318 int err = 0;
1319 int offset = off & (sb->s_blocksize - 1);
1320 int tocopy;
1321 size_t toread;
1322 struct buffer_head tmp_bh;
1323 struct buffer_head *bh;
1324 loff_t i_size = i_size_read(inode);
1325
1326 if (off > i_size)
1327 return 0;
1328 if (off+len > i_size)
1329 len = i_size-off;
1330 toread = len;
1331 while (toread > 0) {
1332 tocopy = sb->s_blocksize - offset < toread ?
1333 sb->s_blocksize - offset : toread;
1334
1335 tmp_bh.b_state = 0;
1336 err = ext2_get_block(inode, blk, &tmp_bh, 0);
a686cd89 1337 if (err < 0)
1da177e4
LT		 1338 return err;
1339 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1340 memset(data, 0, tocopy);
1341 else {
1342 bh = sb_bread(sb, tmp_bh.b_blocknr);
1343 if (!bh)
1344 return -EIO;
1345 memcpy(data, bh->b_data+offset, tocopy);
1346 brelse(bh);
1347 }
1348 offset = 0;
1349 toread -= tocopy;
1350 data += tocopy;
1351 blk++;
1352 }
1353 return len;
1354}
1355
1356/* Write to quotafile */
1357static ssize_t ext2_quota_write(struct super_block *sb, int type,
1358 const char *data, size_t len, loff_t off)
1359{
1360 struct inode *inode = sb_dqopt(sb)->files[type];
1361 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1362 int err = 0;
1363 int offset = off & (sb->s_blocksize - 1);
1364 int tocopy;
1365 size_t towrite = len;
1366 struct buffer_head tmp_bh;
1367 struct buffer_head *bh;
1368
5c81a419 1369 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 1370 while (towrite > 0) {
1371 tocopy = sb->s_blocksize - offset < towrite ?
1372 sb->s_blocksize - offset : towrite;
1373
1374 tmp_bh.b_state = 0;
1375 err = ext2_get_block(inode, blk, &tmp_bh, 1);
a686cd89 1376 if (err < 0)
1da177e4
LT		 1377 goto out;
1378 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1379 bh = sb_bread(sb, tmp_bh.b_blocknr);
1380 else
1381 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1382 if (!bh) {
1383 err = -EIO;
1384 goto out;
1385 }
1386 lock_buffer(bh);
1387 memcpy(bh->b_data+offset, data, tocopy);
1388 flush_dcache_page(bh->b_page);
1389 set_buffer_uptodate(bh);
1390 mark_buffer_dirty(bh);
1391 unlock_buffer(bh);
1392 brelse(bh);
1393 offset = 0;
1394 towrite -= tocopy;
1395 data += tocopy;
1396 blk++;
1397 }
1398out:
1399 if (len == towrite)
1400 return err;
1401 if (inode->i_size < off+len-towrite)
1402 i_size_write(inode, off+len-towrite);
1403 inode->i_version++;
1404 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1405 mark_inode_dirty(inode);
1b1dcc1b 1406 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 1407 return len - towrite;
1408}
1409
1410#endif
1411
1412static struct file_system_type ext2_fs_type = {
1413 .owner = THIS_MODULE,
1414 .name = "ext2",
1415 .get_sb = ext2_get_sb,
1416 .kill_sb = kill_block_super,
1417 .fs_flags = FS_REQUIRES_DEV,
1418};
1419
1420static int __init init_ext2_fs(void)
1421{
1422 int err = init_ext2_xattr();
1423 if (err)
1424 return err;
1425 err = init_inodecache();
1426 if (err)
1427 goto out1;
1428 err = register_filesystem(&ext2_fs_type);
1429 if (err)
1430 goto out;
1431 return 0;
1432out:
1433 destroy_inodecache();
1434out1:
1435 exit_ext2_xattr();
1436 return err;
1437}
1438
1439static void __exit exit_ext2_fs(void)
1440{
1441 unregister_filesystem(&ext2_fs_type);
1442 destroy_inodecache();
1443 exit_ext2_xattr();
1444}
1445
1446module_init(init_ext2_fs)
1447module_exit(exit_ext2_fs)
Linux 6.x block layer and io_uring tree(s)