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1da177e4
LT		 1/*
2 * linux/fs/ext2/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card ([email protected])
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 ([email protected]), 1995
17 */
18
19#include <linux/config.h>
20#include <linux/module.h>
21#include <linux/string.h>
8fc2751b 22#include <linux/fs.h>
1da177e4
LT		 23#include <linux/slab.h>
24#include <linux/init.h>
25#include <linux/blkdev.h>
26#include <linux/parser.h>
27#include <linux/random.h>
28#include <linux/buffer_head.h>
29#include <linux/smp_lock.h>
30#include <linux/vfs.h>
8fc2751b
MB		 31#include <linux/seq_file.h>
32#include <linux/mount.h>
1da177e4
LT		 33#include <asm/uaccess.h>
34#include "ext2.h"
35#include "xattr.h"
36#include "acl.h"
6d79125b 37#include "xip.h"
1da177e4
LT		 38
39static void ext2_sync_super(struct super_block *sb,
40 struct ext2_super_block *es);
41static int ext2_remount (struct super_block * sb, int * flags, char * data);
42static int ext2_statfs (struct super_block * sb, struct kstatfs * buf);
43
44void ext2_error (struct super_block * sb, const char * function,
45 const char * fmt, ...)
46{
47 va_list args;
48 struct ext2_sb_info *sbi = EXT2_SB(sb);
49 struct ext2_super_block *es = sbi->s_es;
50
51 if (!(sb->s_flags & MS_RDONLY)) {
52 sbi->s_mount_state |= EXT2_ERROR_FS;
53 es->s_state =
54 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS);
55 ext2_sync_super(sb, es);
56 }
57
58 va_start(args, fmt);
59 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
60 vprintk(fmt, args);
61 printk("\n");
62 va_end(args);
63
64 if (test_opt(sb, ERRORS_PANIC))
65 panic("EXT2-fs panic from previous error\n");
66 if (test_opt(sb, ERRORS_RO)) {
67 printk("Remounting filesystem read-only\n");
68 sb->s_flags |= MS_RDONLY;
69 }
70}
71
72void ext2_warning (struct super_block * sb, const char * function,
73 const char * fmt, ...)
74{
75 va_list args;
76
77 va_start(args, fmt);
78 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
79 sb->s_id, function);
80 vprintk(fmt, args);
81 printk("\n");
82 va_end(args);
83}
84
85void ext2_update_dynamic_rev(struct super_block *sb)
86{
87 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
88
89 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
90 return;
91
92 ext2_warning(sb, __FUNCTION__,
93 "updating to rev %d because of new feature flag, "
94 "running e2fsck is recommended",
95 EXT2_DYNAMIC_REV);
96
97 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
98 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
99 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
100 /* leave es->s_feature_*compat flags alone */
101 /* es->s_uuid will be set by e2fsck if empty */
102
103 /*
104 * The rest of the superblock fields should be zero, and if not it
105 * means they are likely already in use, so leave them alone. We
106 * can leave it up to e2fsck to clean up any inconsistencies there.
107 */
108}
109
110static void ext2_put_super (struct super_block * sb)
111{
112 int db_count;
113 int i;
114 struct ext2_sb_info *sbi = EXT2_SB(sb);
115
116 ext2_xattr_put_super(sb);
117 if (!(sb->s_flags & MS_RDONLY)) {
118 struct ext2_super_block *es = sbi->s_es;
119
120 es->s_state = cpu_to_le16(sbi->s_mount_state);
121 ext2_sync_super(sb, es);
122 }
123 db_count = sbi->s_gdb_count;
124 for (i = 0; i < db_count; i++)
125 if (sbi->s_group_desc[i])
126 brelse (sbi->s_group_desc[i]);
127 kfree(sbi->s_group_desc);
128 kfree(sbi->s_debts);
129 percpu_counter_destroy(&sbi->s_freeblocks_counter);
130 percpu_counter_destroy(&sbi->s_freeinodes_counter);
131 percpu_counter_destroy(&sbi->s_dirs_counter);
132 brelse (sbi->s_sbh);
133 sb->s_fs_info = NULL;
134 kfree(sbi);
135
136 return;
137}
138
139static kmem_cache_t * ext2_inode_cachep;
140
141static struct inode *ext2_alloc_inode(struct super_block *sb)
142{
143 struct ext2_inode_info *ei;
144 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL);
145 if (!ei)
146 return NULL;
147#ifdef CONFIG_EXT2_FS_POSIX_ACL
148 ei->i_acl = EXT2_ACL_NOT_CACHED;
149 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
150#endif
151 ei->vfs_inode.i_version = 1;
152 return &ei->vfs_inode;
153}
154
155static void ext2_destroy_inode(struct inode *inode)
156{
157 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
158}
159
160static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
161{
162 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
163
164 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
165 SLAB_CTOR_CONSTRUCTOR) {
166 rwlock_init(&ei->i_meta_lock);
167#ifdef CONFIG_EXT2_FS_XATTR
168 init_rwsem(&ei->xattr_sem);
169#endif
170 inode_init_once(&ei->vfs_inode);
171 }
172}
173
174static int init_inodecache(void)
175{
176 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
177 sizeof(struct ext2_inode_info),
178 0, SLAB_RECLAIM_ACCOUNT,
179 init_once, NULL);
180 if (ext2_inode_cachep == NULL)
181 return -ENOMEM;
182 return 0;
183}
184
185static void destroy_inodecache(void)
186{
187 if (kmem_cache_destroy(ext2_inode_cachep))
188 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n");
189}
190
191static void ext2_clear_inode(struct inode *inode)
192{
193#ifdef CONFIG_EXT2_FS_POSIX_ACL
194 struct ext2_inode_info *ei = EXT2_I(inode);
195
196 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
197 posix_acl_release(ei->i_acl);
198 ei->i_acl = EXT2_ACL_NOT_CACHED;
199 }
200 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
201 posix_acl_release(ei->i_default_acl);
202 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
203 }
204#endif
1da177e4
LT		 205}
206
8fc2751b
MB		 207static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
208{
209 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb);
210
211 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID)
212 seq_puts(seq, ",grpid");
213 else
214 seq_puts(seq, ",nogrpid");
215
216#if defined(CONFIG_QUOTA)
217 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
218 seq_puts(seq, ",usrquota");
219
220 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
221 seq_puts(seq, ",grpquota");
222#endif
223
224 return 0;
225}
226
1da177e4
LT		 227#ifdef CONFIG_QUOTA
228static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
229static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
230#endif
231
232static struct super_operations ext2_sops = {
233 .alloc_inode = ext2_alloc_inode,
234 .destroy_inode = ext2_destroy_inode,
235 .read_inode = ext2_read_inode,
236 .write_inode = ext2_write_inode,
e072c6f2 237 .put_inode = ext2_put_inode,
1da177e4
LT		 238 .delete_inode = ext2_delete_inode,
239 .put_super = ext2_put_super,
240 .write_super = ext2_write_super,
241 .statfs = ext2_statfs,
242 .remount_fs = ext2_remount,
243 .clear_inode = ext2_clear_inode,
8fc2751b 244 .show_options = ext2_show_options,
1da177e4
LT		 245#ifdef CONFIG_QUOTA
246 .quota_read = ext2_quota_read,
247 .quota_write = ext2_quota_write,
248#endif
249};
250
251/* Yes, most of these are left as NULL!!
252 * A NULL value implies the default, which works with ext2-like file
253 * systems, but can be improved upon.
254 * Currently only get_parent is required.
255 */
256struct dentry *ext2_get_parent(struct dentry *child);
257static struct export_operations ext2_export_ops = {
258 .get_parent = ext2_get_parent,
259};
260
261static unsigned long get_sb_block(void **data)
262{
263 unsigned long sb_block;
264 char *options = (char *) *data;
265
266 if (!options || strncmp(options, "sb=", 3) != 0)
267 return 1; /* Default location */
268 options += 3;
269 sb_block = simple_strtoul(options, &options, 0);
270 if (*options && *options != ',') {
271 printk("EXT2-fs: Invalid sb specification: %s\n",
272 (char *) *data);
273 return 1;
274 }
275 if (*options == ',')
276 options++;
277 *data = (void *) options;
278 return sb_block;
279}
280
281enum {
282 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
8fc2751b
MB		 283 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
284 Opt_err_ro, Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug,
285 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
286 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
287 Opt_usrquota, Opt_grpquota
1da177e4
LT		 288};
289
290static match_table_t tokens = {
291 {Opt_bsd_df, "bsddf"},
292 {Opt_minix_df, "minixdf"},
293 {Opt_grpid, "grpid"},
294 {Opt_grpid, "bsdgroups"},
295 {Opt_nogrpid, "nogrpid"},
296 {Opt_nogrpid, "sysvgroups"},
297 {Opt_resgid, "resgid=%u"},
298 {Opt_resuid, "resuid=%u"},
299 {Opt_sb, "sb=%u"},
300 {Opt_err_cont, "errors=continue"},
301 {Opt_err_panic, "errors=panic"},
302 {Opt_err_ro, "errors=remount-ro"},
303 {Opt_nouid32, "nouid32"},
304 {Opt_nocheck, "check=none"},
305 {Opt_nocheck, "nocheck"},
306 {Opt_check, "check"},
307 {Opt_debug, "debug"},
308 {Opt_oldalloc, "oldalloc"},
309 {Opt_orlov, "orlov"},
310 {Opt_nobh, "nobh"},
311 {Opt_user_xattr, "user_xattr"},
312 {Opt_nouser_xattr, "nouser_xattr"},
313 {Opt_acl, "acl"},
314 {Opt_noacl, "noacl"},
6d79125b 315 {Opt_xip, "xip"},
8fc2751b 316 {Opt_grpquota, "grpquota"},
1da177e4 317 {Opt_ignore, "noquota"},
8fc2751b
MB		 318 {Opt_quota, "quota"},
319 {Opt_usrquota, "usrquota"},
1da177e4
LT		 320 {Opt_err, NULL}
321};
322
323static int parse_options (char * options,
324 struct ext2_sb_info *sbi)
325{
326 char * p;
327 substring_t args[MAX_OPT_ARGS];
328 unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
329 int option;
330
331 if (!options)
332 return 1;
333
334 while ((p = strsep (&options, ",")) != NULL) {
335 int token;
336 if (!*p)
337 continue;
338
339 token = match_token(p, tokens, args);
340 switch (token) {
341 case Opt_bsd_df:
342 clear_opt (sbi->s_mount_opt, MINIX_DF);
343 break;
344 case Opt_minix_df:
345 set_opt (sbi->s_mount_opt, MINIX_DF);
346 break;
347 case Opt_grpid:
348 set_opt (sbi->s_mount_opt, GRPID);
349 break;
350 case Opt_nogrpid:
351 clear_opt (sbi->s_mount_opt, GRPID);
352 break;
353 case Opt_resuid:
354 if (match_int(&args[0], &option))
355 return 0;
356 sbi->s_resuid = option;
357 break;
358 case Opt_resgid:
359 if (match_int(&args[0], &option))
360 return 0;
361 sbi->s_resgid = option;
362 break;
363 case Opt_sb:
364 /* handled by get_sb_block() instead of here */
365 /* *sb_block = match_int(&args[0]); */
366 break;
367 case Opt_err_panic:
368 kind = EXT2_MOUNT_ERRORS_PANIC;
369 break;
370 case Opt_err_ro:
371 kind = EXT2_MOUNT_ERRORS_RO;
372 break;
373 case Opt_err_cont:
374 kind = EXT2_MOUNT_ERRORS_CONT;
375 break;
376 case Opt_nouid32:
377 set_opt (sbi->s_mount_opt, NO_UID32);
378 break;
379 case Opt_check:
380#ifdef CONFIG_EXT2_CHECK
381 set_opt (sbi->s_mount_opt, CHECK);
382#else
383 printk("EXT2 Check option not supported\n");
384#endif
385 break;
386 case Opt_nocheck:
387 clear_opt (sbi->s_mount_opt, CHECK);
388 break;
389 case Opt_debug:
390 set_opt (sbi->s_mount_opt, DEBUG);
391 break;
392 case Opt_oldalloc:
393 set_opt (sbi->s_mount_opt, OLDALLOC);
394 break;
395 case Opt_orlov:
396 clear_opt (sbi->s_mount_opt, OLDALLOC);
397 break;
398 case Opt_nobh:
399 set_opt (sbi->s_mount_opt, NOBH);
400 break;
401#ifdef CONFIG_EXT2_FS_XATTR
402 case Opt_user_xattr:
403 set_opt (sbi->s_mount_opt, XATTR_USER);
404 break;
405 case Opt_nouser_xattr:
406 clear_opt (sbi->s_mount_opt, XATTR_USER);
407 break;
408#else
409 case Opt_user_xattr:
410 case Opt_nouser_xattr:
411 printk("EXT2 (no)user_xattr options not supported\n");
412 break;
413#endif
414#ifdef CONFIG_EXT2_FS_POSIX_ACL
415 case Opt_acl:
416 set_opt(sbi->s_mount_opt, POSIX_ACL);
417 break;
418 case Opt_noacl:
419 clear_opt(sbi->s_mount_opt, POSIX_ACL);
420 break;
421#else
422 case Opt_acl:
423 case Opt_noacl:
424 printk("EXT2 (no)acl options not supported\n");
425 break;
426#endif
6d79125b
CO		 427 case Opt_xip:
428#ifdef CONFIG_EXT2_FS_XIP
429 set_opt (sbi->s_mount_opt, XIP);
430#else
431 printk("EXT2 xip option not supported\n");
432#endif
433 break;
8fc2751b
MB		 434
435#if defined(CONFIG_QUOTA)
436 case Opt_quota:
437 case Opt_usrquota:
438 set_opt(sbi->s_mount_opt, USRQUOTA);
439 break;
440
441 case Opt_grpquota:
442 set_opt(sbi->s_mount_opt, GRPQUOTA);
443 break;
444#else
445 case Opt_quota:
446 case Opt_usrquota:
447 case Opt_grpquota:
448 printk(KERN_ERR
449 "EXT2-fs: quota operations not supported.\n");
450
451 break;
452#endif
453
1da177e4
LT		 454 case Opt_ignore:
455 break;
456 default:
457 return 0;
458 }
459 }
460 sbi->s_mount_opt |= kind;
461 return 1;
462}
463
464static int ext2_setup_super (struct super_block * sb,
465 struct ext2_super_block * es,
466 int read_only)
467{
468 int res = 0;
469 struct ext2_sb_info *sbi = EXT2_SB(sb);
470
471 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
472 printk ("EXT2-fs warning: revision level too high, "
473 "forcing read-only mode\n");
474 res = MS_RDONLY;
475 }
476 if (read_only)
477 return res;
478 if (!(sbi->s_mount_state & EXT2_VALID_FS))
479 printk ("EXT2-fs warning: mounting unchecked fs, "
480 "running e2fsck is recommended\n");
481 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
482 printk ("EXT2-fs warning: mounting fs with errors, "
483 "running e2fsck is recommended\n");
484 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
485 le16_to_cpu(es->s_mnt_count) >=
486 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
487 printk ("EXT2-fs warning: maximal mount count reached, "
488 "running e2fsck is recommended\n");
489 else if (le32_to_cpu(es->s_checkinterval) &&
490 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
491 printk ("EXT2-fs warning: checktime reached, "
492 "running e2fsck is recommended\n");
493 if (!le16_to_cpu(es->s_max_mnt_count))
494 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
495 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
496 ext2_write_super(sb);
497 if (test_opt (sb, DEBUG))
498 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
499 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
500 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
501 sbi->s_frag_size,
502 sbi->s_groups_count,
503 EXT2_BLOCKS_PER_GROUP(sb),
504 EXT2_INODES_PER_GROUP(sb),
505 sbi->s_mount_opt);
506#ifdef CONFIG_EXT2_CHECK
507 if (test_opt (sb, CHECK)) {
508 ext2_check_blocks_bitmap (sb);
509 ext2_check_inodes_bitmap (sb);
510 }
511#endif
512 return res;
513}
514
515static int ext2_check_descriptors (struct super_block * sb)
516{
517 int i;
518 int desc_block = 0;
519 struct ext2_sb_info *sbi = EXT2_SB(sb);
520 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
521 struct ext2_group_desc * gdp = NULL;
522
523 ext2_debug ("Checking group descriptors");
524
525 for (i = 0; i < sbi->s_groups_count; i++)
526 {
527 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
528 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
529 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
530 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
531 {
532 ext2_error (sb, "ext2_check_descriptors",
533 "Block bitmap for group %d"
534 " not in group (block %lu)!",
535 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
536 return 0;
537 }
538 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
539 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
540 {
541 ext2_error (sb, "ext2_check_descriptors",
542 "Inode bitmap for group %d"
543 " not in group (block %lu)!",
544 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
545 return 0;
546 }
547 if (le32_to_cpu(gdp->bg_inode_table) < block ||
548 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
549 block + EXT2_BLOCKS_PER_GROUP(sb))
550 {
551 ext2_error (sb, "ext2_check_descriptors",
552 "Inode table for group %d"
553 " not in group (block %lu)!",
554 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
555 return 0;
556 }
557 block += EXT2_BLOCKS_PER_GROUP(sb);
558 gdp++;
559 }
560 return 1;
561}
562
563#define log2(n) ffz(~(n))
564
565/*
566 * Maximal file size. There is a direct, and {,double-,triple-}indirect
567 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
568 * We need to be 1 filesystem block less than the 2^32 sector limit.
569 */
570static loff_t ext2_max_size(int bits)
571{
572 loff_t res = EXT2_NDIR_BLOCKS;
573 /* This constant is calculated to be the largest file size for a
574 * dense, 4k-blocksize file such that the total number of
575 * sectors in the file, including data and all indirect blocks,
576 * does not exceed 2^32. */
577 const loff_t upper_limit = 0x1ff7fffd000LL;
578
579 res += 1LL << (bits-2);
580 res += 1LL << (2*(bits-2));
581 res += 1LL << (3*(bits-2));
582 res <<= bits;
583 if (res > upper_limit)
584 res = upper_limit;
585 return res;
586}
587
588static unsigned long descriptor_loc(struct super_block *sb,
589 unsigned long logic_sb_block,
590 int nr)
591{
592 struct ext2_sb_info *sbi = EXT2_SB(sb);
593 unsigned long bg, first_data_block, first_meta_bg;
594 int has_super = 0;
595
596 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
597 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
598
599 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
600 nr < first_meta_bg)
601 return (logic_sb_block + nr + 1);
602 bg = sbi->s_desc_per_block * nr;
603 if (ext2_bg_has_super(sb, bg))
604 has_super = 1;
605 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
606}
607
608static int ext2_fill_super(struct super_block *sb, void *data, int silent)
609{
610 struct buffer_head * bh;
611 struct ext2_sb_info * sbi;
612 struct ext2_super_block * es;
613 struct inode *root;
614 unsigned long block;
615 unsigned long sb_block = get_sb_block(&data);
616 unsigned long logic_sb_block;
617 unsigned long offset = 0;
618 unsigned long def_mount_opts;
619 int blocksize = BLOCK_SIZE;
620 int db_count;
621 int i, j;
622 __le32 features;
623
624 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
625 if (!sbi)
626 return -ENOMEM;
627 sb->s_fs_info = sbi;
628 memset(sbi, 0, sizeof(*sbi));
629
630 /*
631 * See what the current blocksize for the device is, and
632 * use that as the blocksize. Otherwise (or if the blocksize
633 * is smaller than the default) use the default.
634 * This is important for devices that have a hardware
635 * sectorsize that is larger than the default.
636 */
637 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
638 if (!blocksize) {
639 printk ("EXT2-fs: unable to set blocksize\n");
640 goto failed_sbi;
641 }
642
643 /*
644 * If the superblock doesn't start on a hardware sector boundary,
645 * calculate the offset.
646 */
647 if (blocksize != BLOCK_SIZE) {
648 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
649 offset = (sb_block*BLOCK_SIZE) % blocksize;
650 } else {
651 logic_sb_block = sb_block;
652 }
653
654 if (!(bh = sb_bread(sb, logic_sb_block))) {
655 printk ("EXT2-fs: unable to read superblock\n");
656 goto failed_sbi;
657 }
658 /*
659 * Note: s_es must be initialized as soon as possible because
660 * some ext2 macro-instructions depend on its value
661 */
662 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
663 sbi->s_es = es;
664 sb->s_magic = le16_to_cpu(es->s_magic);
665
666 if (sb->s_magic != EXT2_SUPER_MAGIC)
667 goto cantfind_ext2;
668
669 /* Set defaults before we parse the mount options */
670 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
671 if (def_mount_opts & EXT2_DEFM_DEBUG)
672 set_opt(sbi->s_mount_opt, DEBUG);
673 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
674 set_opt(sbi->s_mount_opt, GRPID);
675 if (def_mount_opts & EXT2_DEFM_UID16)
676 set_opt(sbi->s_mount_opt, NO_UID32);
677 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
678 set_opt(sbi->s_mount_opt, XATTR_USER);
679 if (def_mount_opts & EXT2_DEFM_ACL)
680 set_opt(sbi->s_mount_opt, POSIX_ACL);
681
682 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
683 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
684 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
685 set_opt(sbi->s_mount_opt, ERRORS_RO);
686
687 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
688 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
689
690 if (!parse_options ((char *) data, sbi))
691 goto failed_mount;
692
693 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
694 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
695 MS_POSIXACL : 0);
696
6d79125b
CO		 697 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
698 EXT2_MOUNT_XIP if not */
699
1da177e4
LT		 700 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
701 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
702 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
703 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
704 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
705 "running e2fsck is recommended\n");
706 /*
707 * Check feature flags regardless of the revision level, since we
708 * previously didn't change the revision level when setting the flags,
709 * so there is a chance incompat flags are set on a rev 0 filesystem.
710 */
711 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
712 if (features) {
713 printk("EXT2-fs: %s: couldn't mount because of "
714 "unsupported optional features (%x).\n",
715 sb->s_id, le32_to_cpu(features));
716 goto failed_mount;
717 }
718 if (!(sb->s_flags & MS_RDONLY) &&
719 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
720 printk("EXT2-fs: %s: couldn't mount RDWR because of "
721 "unsupported optional features (%x).\n",
722 sb->s_id, le32_to_cpu(features));
723 goto failed_mount;
724 }
725
726 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
727
6d79125b
CO		 728 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
729 (sb->s_blocksize != blocksize))) {
730 if (!silent)
731 printk("XIP: Unsupported blocksize\n");
732 goto failed_mount;
733 }
734
1da177e4
LT		 735 /* If the blocksize doesn't match, re-read the thing.. */
736 if (sb->s_blocksize != blocksize) {
737 brelse(bh);
738
739 if (!sb_set_blocksize(sb, blocksize)) {
740 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
741 goto failed_sbi;
742 }
743
744 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
745 offset = (sb_block*BLOCK_SIZE) % blocksize;
746 bh = sb_bread(sb, logic_sb_block);
747 if(!bh) {
748 printk("EXT2-fs: Couldn't read superblock on "
749 "2nd try.\n");
750 goto failed_sbi;
751 }
752 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
753 sbi->s_es = es;
754 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
755 printk ("EXT2-fs: Magic mismatch, very weird !\n");
756 goto failed_mount;
757 }
758 }
759
760 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
761
762 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
763 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
764 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
765 } else {
766 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
767 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
768 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
769 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
770 (sbi->s_inode_size > blocksize)) {
771 printk ("EXT2-fs: unsupported inode size: %d\n",
772 sbi->s_inode_size);
773 goto failed_mount;
774 }
775 }
776
777 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
778 le32_to_cpu(es->s_log_frag_size);
779 if (sbi->s_frag_size == 0)
780 goto cantfind_ext2;
781 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
782
783 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
784 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
785 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
786
787 if (EXT2_INODE_SIZE(sb) == 0)
788 goto cantfind_ext2;
789 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
790 if (sbi->s_inodes_per_block == 0)
791 goto cantfind_ext2;
792 sbi->s_itb_per_group = sbi->s_inodes_per_group /
793 sbi->s_inodes_per_block;
794 sbi->s_desc_per_block = sb->s_blocksize /
795 sizeof (struct ext2_group_desc);
796 sbi->s_sbh = bh;
797 sbi->s_mount_state = le16_to_cpu(es->s_state);
798 sbi->s_addr_per_block_bits =
799 log2 (EXT2_ADDR_PER_BLOCK(sb));
800 sbi->s_desc_per_block_bits =
801 log2 (EXT2_DESC_PER_BLOCK(sb));
802
803 if (sb->s_magic != EXT2_SUPER_MAGIC)
804 goto cantfind_ext2;
805
806 if (sb->s_blocksize != bh->b_size) {
807 if (!silent)
808 printk ("VFS: Unsupported blocksize on dev "
809 "%s.\n", sb->s_id);
810 goto failed_mount;
811 }
812
813 if (sb->s_blocksize != sbi->s_frag_size) {
814 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
815 sbi->s_frag_size, sb->s_blocksize);
816 goto failed_mount;
817 }
818
819 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
820 printk ("EXT2-fs: #blocks per group too big: %lu\n",
821 sbi->s_blocks_per_group);
822 goto failed_mount;
823 }
824 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
825 printk ("EXT2-fs: #fragments per group too big: %lu\n",
826 sbi->s_frags_per_group);
827 goto failed_mount;
828 }
829 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
830 printk ("EXT2-fs: #inodes per group too big: %lu\n",
831 sbi->s_inodes_per_group);
832 goto failed_mount;
833 }
834
835 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
836 goto cantfind_ext2;
837 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
838 le32_to_cpu(es->s_first_data_block) +
839 EXT2_BLOCKS_PER_GROUP(sb) - 1) /
840 EXT2_BLOCKS_PER_GROUP(sb);
841 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
842 EXT2_DESC_PER_BLOCK(sb);
843 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
844 if (sbi->s_group_desc == NULL) {
845 printk ("EXT2-fs: not enough memory\n");
846 goto failed_mount;
847 }
848 percpu_counter_init(&sbi->s_freeblocks_counter);
849 percpu_counter_init(&sbi->s_freeinodes_counter);
850 percpu_counter_init(&sbi->s_dirs_counter);
851 bgl_lock_init(&sbi->s_blockgroup_lock);
852 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
853 GFP_KERNEL);
854 if (!sbi->s_debts) {
855 printk ("EXT2-fs: not enough memory\n");
856 goto failed_mount_group_desc;
857 }
858 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
859 for (i = 0; i < db_count; i++) {
860 block = descriptor_loc(sb, logic_sb_block, i);
861 sbi->s_group_desc[i] = sb_bread(sb, block);
862 if (!sbi->s_group_desc[i]) {
863 for (j = 0; j < i; j++)
864 brelse (sbi->s_group_desc[j]);
865 printk ("EXT2-fs: unable to read group descriptors\n");
866 goto failed_mount_group_desc;
867 }
868 }
869 if (!ext2_check_descriptors (sb)) {
870 printk ("EXT2-fs: group descriptors corrupted!\n");
871 db_count = i;
872 goto failed_mount2;
873 }
874 sbi->s_gdb_count = db_count;
875 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
876 spin_lock_init(&sbi->s_next_gen_lock);
877 /*
878 * set up enough so that it can read an inode
879 */
880 sb->s_op = &ext2_sops;
881 sb->s_export_op = &ext2_export_ops;
882 sb->s_xattr = ext2_xattr_handlers;
883 root = iget(sb, EXT2_ROOT_INO);
884 sb->s_root = d_alloc_root(root);
885 if (!sb->s_root) {
886 iput(root);
887 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
888 goto failed_mount2;
889 }
890 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
891 dput(sb->s_root);
892 sb->s_root = NULL;
893 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
894 goto failed_mount2;
895 }
896 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
897 ext2_warning(sb, __FUNCTION__,
898 "mounting ext3 filesystem as ext2\n");
899 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
900 percpu_counter_mod(&sbi->s_freeblocks_counter,
901 ext2_count_free_blocks(sb));
902 percpu_counter_mod(&sbi->s_freeinodes_counter,
903 ext2_count_free_inodes(sb));
904 percpu_counter_mod(&sbi->s_dirs_counter,
905 ext2_count_dirs(sb));
906 return 0;
907
908cantfind_ext2:
909 if (!silent)
910 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
911 sb->s_id);
912 goto failed_mount;
913
914failed_mount2:
915 for (i = 0; i < db_count; i++)
916 brelse(sbi->s_group_desc[i]);
917failed_mount_group_desc:
918 kfree(sbi->s_group_desc);
919 kfree(sbi->s_debts);
920failed_mount:
921 brelse(bh);
922failed_sbi:
923 sb->s_fs_info = NULL;
924 kfree(sbi);
925 return -EINVAL;
926}
927
928static void ext2_commit_super (struct super_block * sb,
929 struct ext2_super_block * es)
930{
931 es->s_wtime = cpu_to_le32(get_seconds());
932 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
933 sb->s_dirt = 0;
934}
935
936static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
937{
938 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
939 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
940 es->s_wtime = cpu_to_le32(get_seconds());
941 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
942 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
943 sb->s_dirt = 0;
944}
945
946/*
947 * In the second extended file system, it is not necessary to
948 * write the super block since we use a mapping of the
949 * disk super block in a buffer.
950 *
951 * However, this function is still used to set the fs valid
952 * flags to 0. We need to set this flag to 0 since the fs
953 * may have been checked while mounted and e2fsck may have
954 * set s_state to EXT2_VALID_FS after some corrections.
955 */
956
957void ext2_write_super (struct super_block * sb)
958{
959 struct ext2_super_block * es;
960 lock_kernel();
961 if (!(sb->s_flags & MS_RDONLY)) {
962 es = EXT2_SB(sb)->s_es;
963
964 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
965 ext2_debug ("setting valid to 0\n");
966 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
967 ~EXT2_VALID_FS);
968 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
969 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
970 es->s_mtime = cpu_to_le32(get_seconds());
971 ext2_sync_super(sb, es);
972 } else
973 ext2_commit_super (sb, es);
974 }
975 sb->s_dirt = 0;
976 unlock_kernel();
977}
978
979static int ext2_remount (struct super_block * sb, int * flags, char * data)
980{
981 struct ext2_sb_info * sbi = EXT2_SB(sb);
982 struct ext2_super_block * es;
6d79125b 983 unsigned long old_mount_opt = sbi->s_mount_opt;
50a52234
JK		 984 struct ext2_mount_options old_opts;
985 unsigned long old_sb_flags;
986 int err;
987
988 /* Store the old options */
989 old_sb_flags = sb->s_flags;
990 old_opts.s_mount_opt = sbi->s_mount_opt;
991 old_opts.s_resuid = sbi->s_resuid;
992 old_opts.s_resgid = sbi->s_resgid;
1da177e4
LT		 993
994 /*
995 * Allow the "check" option to be passed as a remount option.
996 */
50a52234
JK		 997 if (!parse_options (data, sbi)) {
998 err = -EINVAL;
999 goto restore_opts;
1000 }
1da177e4
LT		 1001
1002 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1003 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1004
1005 es = sbi->s_es;
6d79125b
CO		 1006 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1007 (old_mount_opt & EXT2_MOUNT_XIP)) &&
1008 invalidate_inodes(sb))
1009 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
1010 "xip remain in cache (no functional problem)");
1da177e4
LT		 1011 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1012 return 0;
1013 if (*flags & MS_RDONLY) {
1014 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1015 !(sbi->s_mount_state & EXT2_VALID_FS))
1016 return 0;
1017 /*
1018 * OK, we are remounting a valid rw partition rdonly, so set
1019 * the rdonly flag and then mark the partition as valid again.
1020 */
1021 es->s_state = cpu_to_le16(sbi->s_mount_state);
1022 es->s_mtime = cpu_to_le32(get_seconds());
1023 } else {
1024 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1025 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1026 if (ret) {
1027 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1028 "unsupported optional features (%x).\n",
1029 sb->s_id, le32_to_cpu(ret));
50a52234
JK		 1030 err = -EROFS;
1031 goto restore_opts;
1da177e4
LT		 1032 }
1033 /*
1034 * Mounting a RDONLY partition read-write, so reread and
1035 * store the current valid flag. (It may have been changed
1036 * by e2fsck since we originally mounted the partition.)
1037 */
1038 sbi->s_mount_state = le16_to_cpu(es->s_state);
1039 if (!ext2_setup_super (sb, es, 0))
1040 sb->s_flags &= ~MS_RDONLY;
1041 }
1042 ext2_sync_super(sb, es);
1043 return 0;
50a52234
JK		 1044restore_opts:
1045 sbi->s_mount_opt = old_opts.s_mount_opt;
1046 sbi->s_resuid = old_opts.s_resuid;
1047 sbi->s_resgid = old_opts.s_resgid;
1048 sb->s_flags = old_sb_flags;
1049 return err;
1da177e4
LT		 1050}
1051
1052static int ext2_statfs (struct super_block * sb, struct kstatfs * buf)
1053{
1054 struct ext2_sb_info *sbi = EXT2_SB(sb);
1055 unsigned long overhead;
1056 int i;
1057
1058 if (test_opt (sb, MINIX_DF))
1059 overhead = 0;
1060 else {
1061 /*
1062 * Compute the overhead (FS structures)
1063 */
1064
1065 /*
1066 * All of the blocks before first_data_block are
1067 * overhead
1068 */
1069 overhead = le32_to_cpu(sbi->s_es->s_first_data_block);
1070
1071 /*
1072 * Add the overhead attributed to the superblock and
1073 * block group descriptors. If the sparse superblocks
1074 * feature is turned on, then not all groups have this.
1075 */
1076 for (i = 0; i < sbi->s_groups_count; i++)
1077 overhead += ext2_bg_has_super(sb, i) +
1078 ext2_bg_num_gdb(sb, i);
1079
1080 /*
1081 * Every block group has an inode bitmap, a block
1082 * bitmap, and an inode table.
1083 */
1084 overhead += (sbi->s_groups_count *
1085 (2 + sbi->s_itb_per_group));
1086 }
1087
1088 buf->f_type = EXT2_SUPER_MAGIC;
1089 buf->f_bsize = sb->s_blocksize;
1090 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
1091 buf->f_bfree = ext2_count_free_blocks(sb);
1092 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
1093 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
1094 buf->f_bavail = 0;
1095 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
1096 buf->f_ffree = ext2_count_free_inodes (sb);
1097 buf->f_namelen = EXT2_NAME_LEN;
1098 return 0;
1099}
1100
1101static struct super_block *ext2_get_sb(struct file_system_type *fs_type,
1102 int flags, const char *dev_name, void *data)
1103{
1104 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1105}
1106
1107#ifdef CONFIG_QUOTA
1108
1109/* Read data from quotafile - avoid pagecache and such because we cannot afford
1110 * acquiring the locks... As quota files are never truncated and quota code
1111 * itself serializes the operations (and noone else should touch the files)
1112 * we don't have to be afraid of races */
1113static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1114 size_t len, loff_t off)
1115{
1116 struct inode *inode = sb_dqopt(sb)->files[type];
1117 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1118 int err = 0;
1119 int offset = off & (sb->s_blocksize - 1);
1120 int tocopy;
1121 size_t toread;
1122 struct buffer_head tmp_bh;
1123 struct buffer_head *bh;
1124 loff_t i_size = i_size_read(inode);
1125
1126 if (off > i_size)
1127 return 0;
1128 if (off+len > i_size)
1129 len = i_size-off;
1130 toread = len;
1131 while (toread > 0) {
1132 tocopy = sb->s_blocksize - offset < toread ?
1133 sb->s_blocksize - offset : toread;
1134
1135 tmp_bh.b_state = 0;
1136 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1137 if (err)
1138 return err;
1139 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1140 memset(data, 0, tocopy);
1141 else {
1142 bh = sb_bread(sb, tmp_bh.b_blocknr);
1143 if (!bh)
1144 return -EIO;
1145 memcpy(data, bh->b_data+offset, tocopy);
1146 brelse(bh);
1147 }
1148 offset = 0;
1149 toread -= tocopy;
1150 data += tocopy;
1151 blk++;
1152 }
1153 return len;
1154}
1155
1156/* Write to quotafile */
1157static ssize_t ext2_quota_write(struct super_block *sb, int type,
1158 const char *data, size_t len, loff_t off)
1159{
1160 struct inode *inode = sb_dqopt(sb)->files[type];
1161 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1162 int err = 0;
1163 int offset = off & (sb->s_blocksize - 1);
1164 int tocopy;
1165 size_t towrite = len;
1166 struct buffer_head tmp_bh;
1167 struct buffer_head *bh;
1168
1169 down(&inode->i_sem);
1170 while (towrite > 0) {
1171 tocopy = sb->s_blocksize - offset < towrite ?
1172 sb->s_blocksize - offset : towrite;
1173
1174 tmp_bh.b_state = 0;
1175 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1176 if (err)
1177 goto out;
1178 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1179 bh = sb_bread(sb, tmp_bh.b_blocknr);
1180 else
1181 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1182 if (!bh) {
1183 err = -EIO;
1184 goto out;
1185 }
1186 lock_buffer(bh);
1187 memcpy(bh->b_data+offset, data, tocopy);
1188 flush_dcache_page(bh->b_page);
1189 set_buffer_uptodate(bh);
1190 mark_buffer_dirty(bh);
1191 unlock_buffer(bh);
1192 brelse(bh);
1193 offset = 0;
1194 towrite -= tocopy;
1195 data += tocopy;
1196 blk++;
1197 }
1198out:
1199 if (len == towrite)
1200 return err;
1201 if (inode->i_size < off+len-towrite)
1202 i_size_write(inode, off+len-towrite);
1203 inode->i_version++;
1204 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1205 mark_inode_dirty(inode);
1206 up(&inode->i_sem);
1207 return len - towrite;
1208}
1209
1210#endif
1211
1212static struct file_system_type ext2_fs_type = {
1213 .owner = THIS_MODULE,
1214 .name = "ext2",
1215 .get_sb = ext2_get_sb,
1216 .kill_sb = kill_block_super,
1217 .fs_flags = FS_REQUIRES_DEV,
1218};
1219
1220static int __init init_ext2_fs(void)
1221{
1222 int err = init_ext2_xattr();
1223 if (err)
1224 return err;
1225 err = init_inodecache();
1226 if (err)
1227 goto out1;
1228 err = register_filesystem(&ext2_fs_type);
1229 if (err)
1230 goto out;
1231 return 0;
1232out:
1233 destroy_inodecache();
1234out1:
1235 exit_ext2_xattr();
1236 return err;
1237}
1238
1239static void __exit exit_ext2_fs(void)
1240{
1241 unregister_filesystem(&ext2_fs_type);
1242 destroy_inodecache();
1243 exit_ext2_xattr();
1244}
1245
1246module_init(init_ext2_fs)
1247module_exit(exit_ext2_fs)
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