blob: f983225266dc7fa2066a5db6b0e929143f603ec1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/string.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070021#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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>
Christoph Hellwiga5694252007-07-17 04:04:28 -070028#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/smp_lock.h>
30#include <linux/vfs.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070031#include <linux/seq_file.h>
32#include <linux/mount.h>
vignesh babud8ea6cf2007-10-16 23:27:14 -070033#include <linux/log2.h>
Jan Kara74abb982008-07-25 01:46:51 -070034#include <linux/quotaops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/uaccess.h>
36#include "ext2.h"
37#include "xattr.h"
38#include "acl.h"
Carsten Otte6d791252005-06-23 22:05:26 -070039#include "xip.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
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);
David Howells726c3342006-06-23 02:02:58 -070044static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
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;
Marcin Slusarz31f68e12008-04-28 02:16:00 -070055 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 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
Harvey Harrison605afd62008-04-28 02:16:03 -070093 ext2_warning(sb, __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 "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;
Pekka J Enberg18a82eb2009-01-07 18:07:19 -0800135 kfree(sbi->s_blockgroup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 kfree(sbi);
137
138 return;
139}
140
Christoph Lametere18b8902006-12-06 20:33:20 -0800141static struct kmem_cache * ext2_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143static struct inode *ext2_alloc_inode(struct super_block *sb)
144{
145 struct ext2_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -0800146 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 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
Martin J. Bligha686cd82007-10-16 23:30:46 -0700153 ei->i_block_alloc_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 ei->vfs_inode.i_version = 1;
155 return &ei->vfs_inode;
156}
157
158static void ext2_destroy_inode(struct inode *inode)
159{
160 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
161}
162
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700163static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
166
Christoph Lametera35afb82007-05-16 22:10:57 -0700167 rwlock_init(&ei->i_meta_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#ifdef CONFIG_EXT2_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700169 init_rwsem(&ei->xattr_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170#endif
Martin J. Bligha686cd82007-10-16 23:30:46 -0700171 mutex_init(&ei->truncate_mutex);
Christoph Lametera35afb82007-05-16 22:10:57 -0700172 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
Paul Mundt20c2df82007-07-20 10:11:58 +0900174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175static int init_inodecache(void)
176{
177 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
178 sizeof(struct ext2_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800179 0, (SLAB_RECLAIM_ACCOUNT|
180 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900181 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (ext2_inode_cachep == NULL)
183 return -ENOMEM;
184 return 0;
185}
186
187static void destroy_inodecache(void)
188{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700189 kmem_cache_destroy(ext2_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192static void ext2_clear_inode(struct inode *inode)
193{
Martin J. Bligha686cd82007-10-16 23:30:46 -0700194 struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195#ifdef CONFIG_EXT2_FS_POSIX_ACL
196 struct ext2_inode_info *ei = EXT2_I(inode);
197
198 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
199 posix_acl_release(ei->i_acl);
200 ei->i_acl = EXT2_ACL_NOT_CACHED;
201 }
202 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
203 posix_acl_release(ei->i_default_acl);
204 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
205 }
206#endif
Martin J. Bligha686cd82007-10-16 23:30:46 -0700207 ext2_discard_reservation(inode);
208 EXT2_I(inode)->i_block_alloc_info = NULL;
209 if (unlikely(rsv))
210 kfree(rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
Mark Bellon8fc27512005-09-06 15:16:54 -0700213static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
214{
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700215 struct super_block *sb = vfs->mnt_sb;
216 struct ext2_sb_info *sbi = EXT2_SB(sb);
217 struct ext2_super_block *es = sbi->s_es;
218 unsigned long def_mount_opts;
Mark Bellon8fc27512005-09-06 15:16:54 -0700219
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700220 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
221
222 if (sbi->s_sb_block != 1)
223 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
224 if (test_opt(sb, MINIX_DF))
225 seq_puts(seq, ",minixdf");
226 if (test_opt(sb, GRPID))
Mark Bellon8fc27512005-09-06 15:16:54 -0700227 seq_puts(seq, ",grpid");
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700228 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
229 seq_puts(seq, ",nogrpid");
230 if (sbi->s_resuid != EXT2_DEF_RESUID ||
231 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
232 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
233 }
234 if (sbi->s_resgid != EXT2_DEF_RESGID ||
235 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
236 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
237 }
Aneesh Kumar K.V14e11e12008-02-06 01:36:17 -0800238 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700239 int def_errors = le16_to_cpu(es->s_errors);
240
241 if (def_errors == EXT2_ERRORS_PANIC ||
Aneesh Kumar K.V14e11e12008-02-06 01:36:17 -0800242 def_errors == EXT2_ERRORS_CONTINUE) {
243 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700244 }
245 }
Aneesh Kumar K.V14e11e12008-02-06 01:36:17 -0800246 if (test_opt(sb, ERRORS_CONT))
247 seq_puts(seq, ",errors=continue");
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700248 if (test_opt(sb, ERRORS_PANIC))
249 seq_puts(seq, ",errors=panic");
250 if (test_opt(sb, NO_UID32))
251 seq_puts(seq, ",nouid32");
252 if (test_opt(sb, DEBUG))
253 seq_puts(seq, ",debug");
254 if (test_opt(sb, OLDALLOC))
255 seq_puts(seq, ",oldalloc");
256
257#ifdef CONFIG_EXT2_FS_XATTR
258 if (test_opt(sb, XATTR_USER))
259 seq_puts(seq, ",user_xattr");
260 if (!test_opt(sb, XATTR_USER) &&
261 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
262 seq_puts(seq, ",nouser_xattr");
263 }
264#endif
265
266#ifdef CONFIG_EXT2_FS_POSIX_ACL
267 if (test_opt(sb, POSIX_ACL))
268 seq_puts(seq, ",acl");
269 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
270 seq_puts(seq, ",noacl");
271#endif
272
273 if (test_opt(sb, NOBH))
274 seq_puts(seq, ",nobh");
Mark Bellon8fc27512005-09-06 15:16:54 -0700275
276#if defined(CONFIG_QUOTA)
277 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
278 seq_puts(seq, ",usrquota");
279
280 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
281 seq_puts(seq, ",grpquota");
282#endif
283
Carsten Otte83541792006-02-03 03:04:25 -0800284#if defined(CONFIG_EXT2_FS_XIP)
285 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
286 seq_puts(seq, ",xip");
287#endif
288
Miklos Szeredi35c879d2008-02-08 04:21:42 -0800289 if (!test_opt(sb, RESERVATION))
290 seq_puts(seq, ",noreservation");
291
Mark Bellon8fc27512005-09-06 15:16:54 -0700292 return 0;
293}
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295#ifdef CONFIG_QUOTA
296static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
297static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
298#endif
299
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800300static const struct super_operations ext2_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 .alloc_inode = ext2_alloc_inode,
302 .destroy_inode = ext2_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 .write_inode = ext2_write_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 .delete_inode = ext2_delete_inode,
305 .put_super = ext2_put_super,
306 .write_super = ext2_write_super,
307 .statfs = ext2_statfs,
308 .remount_fs = ext2_remount,
309 .clear_inode = ext2_clear_inode,
Mark Bellon8fc27512005-09-06 15:16:54 -0700310 .show_options = ext2_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311#ifdef CONFIG_QUOTA
312 .quota_read = ext2_quota_read,
313 .quota_write = ext2_quota_write,
314#endif
315};
316
Christoph Hellwig2e4c68e2007-10-21 16:42:07 -0700317static struct inode *ext2_nfs_get_inode(struct super_block *sb,
318 u64 ino, u32 generation)
NeilBrownecaff752006-09-16 12:15:37 -0700319{
NeilBrownecaff752006-09-16 12:15:37 -0700320 struct inode *inode;
NeilBrownecaff752006-09-16 12:15:37 -0700321
322 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
323 return ERR_PTR(-ESTALE);
324 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
325 return ERR_PTR(-ESTALE);
326
327 /* iget isn't really right if the inode is currently unallocated!!
328 * ext2_read_inode currently does appropriate checks, but
329 * it might be "neater" to call ext2_get_inode first and check
330 * if the inode is valid.....
331 */
David Howells52fcf702008-02-07 00:15:35 -0800332 inode = ext2_iget(sb, ino);
333 if (IS_ERR(inode))
334 return ERR_CAST(inode);
335 if (generation && inode->i_generation != generation) {
NeilBrownecaff752006-09-16 12:15:37 -0700336 /* we didn't find the right inode.. */
337 iput(inode);
338 return ERR_PTR(-ESTALE);
339 }
Christoph Hellwig2e4c68e2007-10-21 16:42:07 -0700340 return inode;
341}
342
343static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
344 int fh_len, int fh_type)
345{
346 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
347 ext2_nfs_get_inode);
348}
349
350static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
351 int fh_len, int fh_type)
352{
353 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
354 ext2_nfs_get_inode);
NeilBrownecaff752006-09-16 12:15:37 -0700355}
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357/* Yes, most of these are left as NULL!!
358 * A NULL value implies the default, which works with ext2-like file
359 * systems, but can be improved upon.
360 * Currently only get_parent is required.
361 */
Christoph Hellwig39655162007-10-21 16:42:17 -0700362static const struct export_operations ext2_export_ops = {
Christoph Hellwig2e4c68e2007-10-21 16:42:07 -0700363 .fh_to_dentry = ext2_fh_to_dentry,
364 .fh_to_parent = ext2_fh_to_parent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 .get_parent = ext2_get_parent,
366};
367
368static unsigned long get_sb_block(void **data)
369{
370 unsigned long sb_block;
371 char *options = (char *) *data;
372
373 if (!options || strncmp(options, "sb=", 3) != 0)
374 return 1; /* Default location */
375 options += 3;
376 sb_block = simple_strtoul(options, &options, 0);
377 if (*options && *options != ',') {
378 printk("EXT2-fs: Invalid sb specification: %s\n",
379 (char *) *data);
380 return 1;
381 }
382 if (*options == ',')
383 options++;
384 *data = (void *) options;
385 return sb_block;
386}
387
388enum {
389 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
Mark Bellon8fc27512005-09-06 15:16:54 -0700390 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
Adrian Bunk2860b732005-11-08 21:34:59 -0800391 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
Mark Bellon8fc27512005-09-06 15:16:54 -0700392 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
393 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
Martin J. Bligha686cd82007-10-16 23:30:46 -0700394 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395};
396
Steven Whitehousea447c092008-10-13 10:46:57 +0100397static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 {Opt_bsd_df, "bsddf"},
399 {Opt_minix_df, "minixdf"},
400 {Opt_grpid, "grpid"},
401 {Opt_grpid, "bsdgroups"},
402 {Opt_nogrpid, "nogrpid"},
403 {Opt_nogrpid, "sysvgroups"},
404 {Opt_resgid, "resgid=%u"},
405 {Opt_resuid, "resuid=%u"},
406 {Opt_sb, "sb=%u"},
407 {Opt_err_cont, "errors=continue"},
408 {Opt_err_panic, "errors=panic"},
409 {Opt_err_ro, "errors=remount-ro"},
410 {Opt_nouid32, "nouid32"},
411 {Opt_nocheck, "check=none"},
412 {Opt_nocheck, "nocheck"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 {Opt_debug, "debug"},
414 {Opt_oldalloc, "oldalloc"},
415 {Opt_orlov, "orlov"},
416 {Opt_nobh, "nobh"},
417 {Opt_user_xattr, "user_xattr"},
418 {Opt_nouser_xattr, "nouser_xattr"},
419 {Opt_acl, "acl"},
420 {Opt_noacl, "noacl"},
Carsten Otte6d791252005-06-23 22:05:26 -0700421 {Opt_xip, "xip"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700422 {Opt_grpquota, "grpquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 {Opt_ignore, "noquota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700424 {Opt_quota, "quota"},
425 {Opt_usrquota, "usrquota"},
Martin J. Bligha686cd82007-10-16 23:30:46 -0700426 {Opt_reservation, "reservation"},
427 {Opt_noreservation, "noreservation"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 {Opt_err, NULL}
429};
430
431static int parse_options (char * options,
432 struct ext2_sb_info *sbi)
433{
434 char * p;
435 substring_t args[MAX_OPT_ARGS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 int option;
437
438 if (!options)
439 return 1;
440
441 while ((p = strsep (&options, ",")) != NULL) {
442 int token;
443 if (!*p)
444 continue;
445
446 token = match_token(p, tokens, args);
447 switch (token) {
448 case Opt_bsd_df:
449 clear_opt (sbi->s_mount_opt, MINIX_DF);
450 break;
451 case Opt_minix_df:
452 set_opt (sbi->s_mount_opt, MINIX_DF);
453 break;
454 case Opt_grpid:
455 set_opt (sbi->s_mount_opt, GRPID);
456 break;
457 case Opt_nogrpid:
458 clear_opt (sbi->s_mount_opt, GRPID);
459 break;
460 case Opt_resuid:
461 if (match_int(&args[0], &option))
462 return 0;
463 sbi->s_resuid = option;
464 break;
465 case Opt_resgid:
466 if (match_int(&args[0], &option))
467 return 0;
468 sbi->s_resgid = option;
469 break;
470 case Opt_sb:
471 /* handled by get_sb_block() instead of here */
472 /* *sb_block = match_int(&args[0]); */
473 break;
474 case Opt_err_panic:
Vasily Averin5a2b4062006-10-11 01:21:50 -0700475 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
476 clear_opt (sbi->s_mount_opt, ERRORS_RO);
477 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 break;
479 case Opt_err_ro:
Vasily Averin5a2b4062006-10-11 01:21:50 -0700480 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
481 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
482 set_opt (sbi->s_mount_opt, ERRORS_RO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 break;
484 case Opt_err_cont:
Vasily Averin5a2b4062006-10-11 01:21:50 -0700485 clear_opt (sbi->s_mount_opt, ERRORS_RO);
486 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
487 set_opt (sbi->s_mount_opt, ERRORS_CONT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 break;
489 case Opt_nouid32:
490 set_opt (sbi->s_mount_opt, NO_UID32);
491 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 case Opt_nocheck:
493 clear_opt (sbi->s_mount_opt, CHECK);
494 break;
495 case Opt_debug:
496 set_opt (sbi->s_mount_opt, DEBUG);
497 break;
498 case Opt_oldalloc:
499 set_opt (sbi->s_mount_opt, OLDALLOC);
500 break;
501 case Opt_orlov:
502 clear_opt (sbi->s_mount_opt, OLDALLOC);
503 break;
504 case Opt_nobh:
505 set_opt (sbi->s_mount_opt, NOBH);
506 break;
507#ifdef CONFIG_EXT2_FS_XATTR
508 case Opt_user_xattr:
509 set_opt (sbi->s_mount_opt, XATTR_USER);
510 break;
511 case Opt_nouser_xattr:
512 clear_opt (sbi->s_mount_opt, XATTR_USER);
513 break;
514#else
515 case Opt_user_xattr:
516 case Opt_nouser_xattr:
517 printk("EXT2 (no)user_xattr options not supported\n");
518 break;
519#endif
520#ifdef CONFIG_EXT2_FS_POSIX_ACL
521 case Opt_acl:
522 set_opt(sbi->s_mount_opt, POSIX_ACL);
523 break;
524 case Opt_noacl:
525 clear_opt(sbi->s_mount_opt, POSIX_ACL);
526 break;
527#else
528 case Opt_acl:
529 case Opt_noacl:
530 printk("EXT2 (no)acl options not supported\n");
531 break;
532#endif
Carsten Otte6d791252005-06-23 22:05:26 -0700533 case Opt_xip:
534#ifdef CONFIG_EXT2_FS_XIP
535 set_opt (sbi->s_mount_opt, XIP);
536#else
537 printk("EXT2 xip option not supported\n");
538#endif
539 break;
Mark Bellon8fc27512005-09-06 15:16:54 -0700540
541#if defined(CONFIG_QUOTA)
542 case Opt_quota:
543 case Opt_usrquota:
544 set_opt(sbi->s_mount_opt, USRQUOTA);
545 break;
546
547 case Opt_grpquota:
548 set_opt(sbi->s_mount_opt, GRPQUOTA);
549 break;
550#else
551 case Opt_quota:
552 case Opt_usrquota:
553 case Opt_grpquota:
554 printk(KERN_ERR
555 "EXT2-fs: quota operations not supported.\n");
556
557 break;
558#endif
559
Martin J. Bligha686cd82007-10-16 23:30:46 -0700560 case Opt_reservation:
561 set_opt(sbi->s_mount_opt, RESERVATION);
562 printk("reservations ON\n");
563 break;
564 case Opt_noreservation:
565 clear_opt(sbi->s_mount_opt, RESERVATION);
566 printk("reservations OFF\n");
567 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 case Opt_ignore:
569 break;
570 default:
571 return 0;
572 }
573 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 return 1;
575}
576
577static int ext2_setup_super (struct super_block * sb,
578 struct ext2_super_block * es,
579 int read_only)
580{
581 int res = 0;
582 struct ext2_sb_info *sbi = EXT2_SB(sb);
583
584 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
585 printk ("EXT2-fs warning: revision level too high, "
586 "forcing read-only mode\n");
587 res = MS_RDONLY;
588 }
589 if (read_only)
590 return res;
591 if (!(sbi->s_mount_state & EXT2_VALID_FS))
592 printk ("EXT2-fs warning: mounting unchecked fs, "
593 "running e2fsck is recommended\n");
594 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
595 printk ("EXT2-fs warning: mounting fs with errors, "
596 "running e2fsck is recommended\n");
597 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
598 le16_to_cpu(es->s_mnt_count) >=
599 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
600 printk ("EXT2-fs warning: maximal mount count reached, "
601 "running e2fsck is recommended\n");
602 else if (le32_to_cpu(es->s_checkinterval) &&
603 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
604 printk ("EXT2-fs warning: checktime reached, "
605 "running e2fsck is recommended\n");
606 if (!le16_to_cpu(es->s_max_mnt_count))
607 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
Marcin Slusarzfba4d392008-04-28 02:15:59 -0700608 le16_add_cpu(&es->s_mnt_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 ext2_write_super(sb);
610 if (test_opt (sb, DEBUG))
611 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
612 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 return res;
620}
621
Akinobu Mita197cd65a2008-02-06 01:40:16 -0800622static int ext2_check_descriptors(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 struct ext2_sb_info *sbi = EXT2_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 ext2_debug ("Checking group descriptors");
628
Akinobu Mita197cd65a2008-02-06 01:40:16 -0800629 for (i = 0; i < sbi->s_groups_count; i++) {
630 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
Akinobu Mita24097d12008-04-28 02:16:01 -0700631 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
632 ext2_fsblk_t last_block;
Akinobu Mita197cd65a2008-02-06 01:40:16 -0800633
Eric Sandeen41f04d82006-09-27 01:49:30 -0700634 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
Eric Sandeen41f04d82006-09-27 01:49:30 -0700640 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
641 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 {
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 }
Eric Sandeen41f04d82006-09-27 01:49:30 -0700649 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
650 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 {
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 }
Eric Sandeen41f04d82006-09-27 01:49:30 -0700658 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
Eric Sandeen780dcdb2007-07-26 10:41:11 -0700659 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
Eric Sandeen41f04d82006-09-27 01:49:30 -0700660 last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 {
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
669 return 1;
670}
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672/*
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 */
677static loff_t ext2_max_size(int bits)
678{
679 loff_t res = EXT2_NDIR_BLOCKS;
Aneesh Kumar K.V902be4c2008-01-28 23:58:26 -0500680 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 * sectors in the file, including data and all indirect blocks,
Aneesh Kumar K.V902be4c2008-01-28 23:58:26 -0500686 * 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
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;
Aneesh Kumar K.V902be4c2008-01-28 23:58:26 -0500712
713 if (res > MAX_LFS_FILESIZE)
714 res = MAX_LFS_FILESIZE;
715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 return res;
717}
718
719static 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);
Akinobu Mita24097d12008-04-28 02:16:01 -0700724 unsigned long bg, first_meta_bg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 int has_super = 0;
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 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;
Akinobu Mita24097d12008-04-28 02:16:01 -0700735
736 return ext2_group_first_block_no(sb, bg) + has_super;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737}
738
739static 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;
David Howells52fcf702008-02-07 00:15:35 -0800750 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 int blocksize = BLOCK_SIZE;
752 int db_count;
753 int i, j;
754 __le32 features;
Peter Zijlstra833f4072007-10-16 23:25:45 -0700755 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700757 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 if (!sbi)
759 return -ENOMEM;
Pekka J Enberg18a82eb2009-01-07 18:07:19 -0800760
761 sbi->s_blockgroup_lock =
762 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
763 if (!sbi->s_blockgroup_lock) {
764 kfree(sbi);
765 return -ENOMEM;
766 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 sb->s_fs_info = sbi;
Miklos Szeredi93d44cb2007-10-16 23:26:26 -0700768 sbi->s_sb_block = sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770 /*
771 * See what the current blocksize for the device is, and
772 * use that as the blocksize. Otherwise (or if the blocksize
773 * is smaller than the default) use the default.
774 * This is important for devices that have a hardware
775 * sectorsize that is larger than the default.
776 */
777 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
778 if (!blocksize) {
779 printk ("EXT2-fs: unable to set blocksize\n");
780 goto failed_sbi;
781 }
782
783 /*
784 * If the superblock doesn't start on a hardware sector boundary,
785 * calculate the offset.
786 */
787 if (blocksize != BLOCK_SIZE) {
788 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
789 offset = (sb_block*BLOCK_SIZE) % blocksize;
790 } else {
791 logic_sb_block = sb_block;
792 }
793
794 if (!(bh = sb_bread(sb, logic_sb_block))) {
795 printk ("EXT2-fs: unable to read superblock\n");
796 goto failed_sbi;
797 }
798 /*
799 * Note: s_es must be initialized as soon as possible because
800 * some ext2 macro-instructions depend on its value
801 */
802 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
803 sbi->s_es = es;
804 sb->s_magic = le16_to_cpu(es->s_magic);
805
806 if (sb->s_magic != EXT2_SUPER_MAGIC)
807 goto cantfind_ext2;
808
809 /* Set defaults before we parse the mount options */
810 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
811 if (def_mount_opts & EXT2_DEFM_DEBUG)
812 set_opt(sbi->s_mount_opt, DEBUG);
813 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
814 set_opt(sbi->s_mount_opt, GRPID);
815 if (def_mount_opts & EXT2_DEFM_UID16)
816 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -0800817#ifdef CONFIG_EXT2_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
819 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -0800820#endif
821#ifdef CONFIG_EXT2_FS_POSIX_ACL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (def_mount_opts & EXT2_DEFM_ACL)
823 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -0800824#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
827 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.V14e11e12008-02-06 01:36:17 -0800828 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
Vasily Averin5a2b4062006-10-11 01:21:50 -0700829 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.V14e11e12008-02-06 01:36:17 -0800830 else
831 set_opt(sbi->s_mount_opt, ERRORS_RO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
834 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
835
Martin J. Bligha686cd82007-10-16 23:30:46 -0700836 set_opt(sbi->s_mount_opt, RESERVATION);
837
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 if (!parse_options ((char *) data, sbi))
839 goto failed_mount;
840
841 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
842 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
843 MS_POSIXACL : 0);
844
Carsten Otte6d791252005-06-23 22:05:26 -0700845 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
846 EXT2_MOUNT_XIP if not */
847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
849 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
850 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
851 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
852 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
853 "running e2fsck is recommended\n");
854 /*
855 * Check feature flags regardless of the revision level, since we
856 * previously didn't change the revision level when setting the flags,
857 * so there is a chance incompat flags are set on a rev 0 filesystem.
858 */
859 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
860 if (features) {
861 printk("EXT2-fs: %s: couldn't mount because of "
862 "unsupported optional features (%x).\n",
863 sb->s_id, le32_to_cpu(features));
864 goto failed_mount;
865 }
866 if (!(sb->s_flags & MS_RDONLY) &&
867 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
868 printk("EXT2-fs: %s: couldn't mount RDWR because of "
869 "unsupported optional features (%x).\n",
870 sb->s_id, le32_to_cpu(features));
871 goto failed_mount;
872 }
873
874 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
875
Nick Piggina8e3eff2008-02-06 01:37:42 -0800876 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
Carsten Otte6d791252005-06-23 22:05:26 -0700877 if (!silent)
878 printk("XIP: Unsupported blocksize\n");
879 goto failed_mount;
880 }
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 /* If the blocksize doesn't match, re-read the thing.. */
883 if (sb->s_blocksize != blocksize) {
884 brelse(bh);
885
886 if (!sb_set_blocksize(sb, blocksize)) {
887 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
888 goto failed_sbi;
889 }
890
891 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
892 offset = (sb_block*BLOCK_SIZE) % blocksize;
893 bh = sb_bread(sb, logic_sb_block);
894 if(!bh) {
895 printk("EXT2-fs: Couldn't read superblock on "
896 "2nd try.\n");
897 goto failed_sbi;
898 }
899 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
900 sbi->s_es = es;
901 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
902 printk ("EXT2-fs: Magic mismatch, very weird !\n");
903 goto failed_mount;
904 }
905 }
906
907 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
908
909 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
910 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
911 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
912 } else {
913 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
914 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
915 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
vignesh babud8ea6cf2007-10-16 23:27:14 -0700916 !is_power_of_2(sbi->s_inode_size) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 (sbi->s_inode_size > blocksize)) {
918 printk ("EXT2-fs: unsupported inode size: %d\n",
919 sbi->s_inode_size);
920 goto failed_mount;
921 }
922 }
923
924 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
925 le32_to_cpu(es->s_log_frag_size);
926 if (sbi->s_frag_size == 0)
927 goto cantfind_ext2;
928 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
929
930 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
931 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
932 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
933
934 if (EXT2_INODE_SIZE(sb) == 0)
935 goto cantfind_ext2;
936 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
Andries Brouwer607eb262006-08-27 01:23:43 -0700937 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 goto cantfind_ext2;
939 sbi->s_itb_per_group = sbi->s_inodes_per_group /
940 sbi->s_inodes_per_block;
941 sbi->s_desc_per_block = sb->s_blocksize /
942 sizeof (struct ext2_group_desc);
943 sbi->s_sbh = bh;
944 sbi->s_mount_state = le16_to_cpu(es->s_state);
945 sbi->s_addr_per_block_bits =
David Howellsf0d1b0b2006-12-08 02:37:49 -0800946 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 sbi->s_desc_per_block_bits =
David Howellsf0d1b0b2006-12-08 02:37:49 -0800948 ilog2 (EXT2_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 if (sb->s_magic != EXT2_SUPER_MAGIC)
951 goto cantfind_ext2;
952
953 if (sb->s_blocksize != bh->b_size) {
954 if (!silent)
955 printk ("VFS: Unsupported blocksize on dev "
956 "%s.\n", sb->s_id);
957 goto failed_mount;
958 }
959
960 if (sb->s_blocksize != sbi->s_frag_size) {
961 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
962 sbi->s_frag_size, sb->s_blocksize);
963 goto failed_mount;
964 }
965
966 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
967 printk ("EXT2-fs: #blocks per group too big: %lu\n",
968 sbi->s_blocks_per_group);
969 goto failed_mount;
970 }
971 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
972 printk ("EXT2-fs: #fragments per group too big: %lu\n",
973 sbi->s_frags_per_group);
974 goto failed_mount;
975 }
976 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
977 printk ("EXT2-fs: #inodes per group too big: %lu\n",
978 sbi->s_inodes_per_group);
979 goto failed_mount;
980 }
981
982 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
983 goto cantfind_ext2;
Eric Sandeen41f04d82006-09-27 01:49:30 -0700984 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
985 le32_to_cpu(es->s_first_data_block) - 1)
986 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
988 EXT2_DESC_PER_BLOCK(sb);
989 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
990 if (sbi->s_group_desc == NULL) {
991 printk ("EXT2-fs: not enough memory\n");
992 goto failed_mount;
993 }
Pekka J Enberg18a82eb2009-01-07 18:07:19 -0800994 bgl_lock_init(sbi->s_blockgroup_lock);
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700995 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 if (!sbi->s_debts) {
997 printk ("EXT2-fs: not enough memory\n");
998 goto failed_mount_group_desc;
999 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 for (i = 0; i < db_count; i++) {
1001 block = descriptor_loc(sb, logic_sb_block, i);
1002 sbi->s_group_desc[i] = sb_bread(sb, block);
1003 if (!sbi->s_group_desc[i]) {
1004 for (j = 0; j < i; j++)
1005 brelse (sbi->s_group_desc[j]);
1006 printk ("EXT2-fs: unable to read group descriptors\n");
1007 goto failed_mount_group_desc;
1008 }
1009 }
1010 if (!ext2_check_descriptors (sb)) {
1011 printk ("EXT2-fs: group descriptors corrupted!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 goto failed_mount2;
1013 }
1014 sbi->s_gdb_count = db_count;
1015 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1016 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001017
Martin J. Bligha686cd82007-10-16 23:30:46 -07001018 /* per fileystem reservation list head & lock */
1019 spin_lock_init(&sbi->s_rsv_window_lock);
1020 sbi->s_rsv_window_root = RB_ROOT;
1021 /*
1022 * Add a single, static dummy reservation to the start of the
1023 * reservation window list --- it gives us a placeholder for
1024 * append-at-start-of-list which makes the allocation logic
1025 * _much_ simpler.
1026 */
1027 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1028 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1029 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1030 sbi->s_rsv_window_head.rsv_goal_size = 0;
1031 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1032
Peter Zijlstra833f4072007-10-16 23:25:45 -07001033 err = percpu_counter_init(&sbi->s_freeblocks_counter,
Mingming Cao0216bfc2006-06-23 02:05:41 -07001034 ext2_count_free_blocks(sb));
Peter Zijlstra833f4072007-10-16 23:25:45 -07001035 if (!err) {
1036 err = percpu_counter_init(&sbi->s_freeinodes_counter,
Mingming Cao0216bfc2006-06-23 02:05:41 -07001037 ext2_count_free_inodes(sb));
Peter Zijlstra833f4072007-10-16 23:25:45 -07001038 }
1039 if (!err) {
1040 err = percpu_counter_init(&sbi->s_dirs_counter,
Mingming Cao0216bfc2006-06-23 02:05:41 -07001041 ext2_count_dirs(sb));
Peter Zijlstra833f4072007-10-16 23:25:45 -07001042 }
1043 if (err) {
1044 printk(KERN_ERR "EXT2-fs: insufficient memory\n");
1045 goto failed_mount3;
1046 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 /*
1048 * set up enough so that it can read an inode
1049 */
1050 sb->s_op = &ext2_sops;
1051 sb->s_export_op = &ext2_export_ops;
1052 sb->s_xattr = ext2_xattr_handlers;
David Howells52fcf702008-02-07 00:15:35 -08001053 root = ext2_iget(sb, EXT2_ROOT_INO);
1054 if (IS_ERR(root)) {
1055 ret = PTR_ERR(root);
1056 goto failed_mount3;
1057 }
1058 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1059 iput(root);
1060 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
1061 goto failed_mount3;
1062 }
1063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 sb->s_root = d_alloc_root(root);
1065 if (!sb->s_root) {
1066 iput(root);
1067 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
David Howells52fcf702008-02-07 00:15:35 -08001068 ret = -ENOMEM;
Mingming Cao0216bfc2006-06-23 02:05:41 -07001069 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 }
1071 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
Harvey Harrison605afd62008-04-28 02:16:03 -07001072 ext2_warning(sb, __func__,
Johann Lombardiec63f222005-11-13 16:07:36 -08001073 "mounting ext3 filesystem as ext2");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 return 0;
1076
1077cantfind_ext2:
1078 if (!silent)
1079 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1080 sb->s_id);
1081 goto failed_mount;
Mingming Cao0216bfc2006-06-23 02:05:41 -07001082failed_mount3:
1083 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1084 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1085 percpu_counter_destroy(&sbi->s_dirs_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086failed_mount2:
1087 for (i = 0; i < db_count; i++)
1088 brelse(sbi->s_group_desc[i]);
1089failed_mount_group_desc:
1090 kfree(sbi->s_group_desc);
1091 kfree(sbi->s_debts);
1092failed_mount:
1093 brelse(bh);
1094failed_sbi:
1095 sb->s_fs_info = NULL;
1096 kfree(sbi);
David Howells52fcf702008-02-07 00:15:35 -08001097 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098}
1099
1100static void ext2_commit_super (struct super_block * sb,
1101 struct ext2_super_block * es)
1102{
1103 es->s_wtime = cpu_to_le32(get_seconds());
1104 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1105 sb->s_dirt = 0;
1106}
1107
1108static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
1109{
1110 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1111 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1112 es->s_wtime = cpu_to_le32(get_seconds());
1113 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1114 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1115 sb->s_dirt = 0;
1116}
1117
1118/*
1119 * In the second extended file system, it is not necessary to
1120 * write the super block since we use a mapping of the
1121 * disk super block in a buffer.
1122 *
1123 * However, this function is still used to set the fs valid
1124 * flags to 0. We need to set this flag to 0 since the fs
1125 * may have been checked while mounted and e2fsck may have
1126 * set s_state to EXT2_VALID_FS after some corrections.
1127 */
1128
1129void ext2_write_super (struct super_block * sb)
1130{
1131 struct ext2_super_block * es;
1132 lock_kernel();
1133 if (!(sb->s_flags & MS_RDONLY)) {
1134 es = EXT2_SB(sb)->s_es;
1135
Marcin Slusarz31f68e12008-04-28 02:16:00 -07001136 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 ext2_debug ("setting valid to 0\n");
Marcin Slusarz31f68e12008-04-28 02:16:00 -07001138 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1140 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1141 es->s_mtime = cpu_to_le32(get_seconds());
1142 ext2_sync_super(sb, es);
1143 } else
1144 ext2_commit_super (sb, es);
1145 }
1146 sb->s_dirt = 0;
1147 unlock_kernel();
1148}
1149
1150static int ext2_remount (struct super_block * sb, int * flags, char * data)
1151{
1152 struct ext2_sb_info * sbi = EXT2_SB(sb);
1153 struct ext2_super_block * es;
Carsten Otte6d791252005-06-23 22:05:26 -07001154 unsigned long old_mount_opt = sbi->s_mount_opt;
Jan Kara50a52232005-07-12 13:58:29 -07001155 struct ext2_mount_options old_opts;
1156 unsigned long old_sb_flags;
1157 int err;
1158
1159 /* Store the old options */
1160 old_sb_flags = sb->s_flags;
1161 old_opts.s_mount_opt = sbi->s_mount_opt;
1162 old_opts.s_resuid = sbi->s_resuid;
1163 old_opts.s_resgid = sbi->s_resgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
1165 /*
1166 * Allow the "check" option to be passed as a remount option.
1167 */
Jan Kara50a52232005-07-12 13:58:29 -07001168 if (!parse_options (data, sbi)) {
1169 err = -EINVAL;
1170 goto restore_opts;
1171 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1174 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1175
Carsten Otte266f5aa2007-06-23 17:16:46 -07001176 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1177 EXT2_MOUNT_XIP if not */
1178
1179 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1180 printk("XIP: Unsupported blocksize\n");
Andrew Mortonddc80bd2007-06-27 14:10:08 -07001181 err = -EINVAL;
Carsten Otte266f5aa2007-06-23 17:16:46 -07001182 goto restore_opts;
1183 }
1184
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 es = sbi->s_es;
Carsten Otte6d791252005-06-23 22:05:26 -07001186 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1187 (old_mount_opt & EXT2_MOUNT_XIP)) &&
Carsten Otte0e4a9b52009-02-11 13:04:37 -08001188 invalidate_inodes(sb)) {
1189 ext2_warning(sb, __func__, "refusing change of xip flag "
1190 "with busy inodes while remounting");
1191 sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
1192 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
1193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1195 return 0;
1196 if (*flags & MS_RDONLY) {
1197 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1198 !(sbi->s_mount_state & EXT2_VALID_FS))
1199 return 0;
1200 /*
1201 * OK, we are remounting a valid rw partition rdonly, so set
1202 * the rdonly flag and then mark the partition as valid again.
1203 */
1204 es->s_state = cpu_to_le16(sbi->s_mount_state);
1205 es->s_mtime = cpu_to_le32(get_seconds());
1206 } else {
1207 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1208 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1209 if (ret) {
1210 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1211 "unsupported optional features (%x).\n",
1212 sb->s_id, le32_to_cpu(ret));
Jan Kara50a52232005-07-12 13:58:29 -07001213 err = -EROFS;
1214 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 }
1216 /*
1217 * Mounting a RDONLY partition read-write, so reread and
1218 * store the current valid flag. (It may have been changed
1219 * by e2fsck since we originally mounted the partition.)
1220 */
1221 sbi->s_mount_state = le16_to_cpu(es->s_state);
1222 if (!ext2_setup_super (sb, es, 0))
1223 sb->s_flags &= ~MS_RDONLY;
1224 }
1225 ext2_sync_super(sb, es);
1226 return 0;
Jan Kara50a52232005-07-12 13:58:29 -07001227restore_opts:
1228 sbi->s_mount_opt = old_opts.s_mount_opt;
1229 sbi->s_resuid = old_opts.s_resuid;
1230 sbi->s_resgid = old_opts.s_resgid;
1231 sb->s_flags = old_sb_flags;
1232 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233}
1234
David Howells726c3342006-06-23 02:02:58 -07001235static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236{
David Howells726c3342006-06-23 02:02:58 -07001237 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 struct ext2_sb_info *sbi = EXT2_SB(sb);
Pekka Enberge4fca012006-12-06 20:35:27 -08001239 struct ext2_super_block *es = sbi->s_es;
Pekka Enberge4fca012006-12-06 20:35:27 -08001240 u64 fsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
1242 if (test_opt (sb, MINIX_DF))
Badari Pulavarty22352192007-07-15 23:41:58 -07001243 sbi->s_overhead_last = 0;
1244 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1245 unsigned long i, overhead = 0;
1246 smp_rmb();
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 /*
Badari Pulavarty22352192007-07-15 23:41:58 -07001249 * Compute the overhead (FS structures). This is constant
1250 * for a given filesystem unless the number of block groups
1251 * changes so we cache the previous value until it does.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 */
1253
1254 /*
1255 * All of the blocks before first_data_block are
1256 * overhead
1257 */
Pekka Enberge4fca012006-12-06 20:35:27 -08001258 overhead = le32_to_cpu(es->s_first_data_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
1260 /*
1261 * Add the overhead attributed to the superblock and
1262 * block group descriptors. If the sparse superblocks
1263 * feature is turned on, then not all groups have this.
1264 */
1265 for (i = 0; i < sbi->s_groups_count; i++)
1266 overhead += ext2_bg_has_super(sb, i) +
1267 ext2_bg_num_gdb(sb, i);
1268
1269 /*
1270 * Every block group has an inode bitmap, a block
1271 * bitmap, and an inode table.
1272 */
1273 overhead += (sbi->s_groups_count *
1274 (2 + sbi->s_itb_per_group));
Badari Pulavarty22352192007-07-15 23:41:58 -07001275 sbi->s_overhead_last = overhead;
1276 smp_wmb();
1277 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 }
1279
1280 buf->f_type = EXT2_SUPER_MAGIC;
1281 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty22352192007-07-15 23:41:58 -07001282 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 buf->f_bfree = ext2_count_free_blocks(sb);
Badari Pulavarty22352192007-07-15 23:41:58 -07001284 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
Pekka Enberge4fca012006-12-06 20:35:27 -08001285 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1286 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 buf->f_bavail = 0;
Pekka Enberge4fca012006-12-06 20:35:27 -08001288 buf->f_files = le32_to_cpu(es->s_inodes_count);
1289 buf->f_ffree = ext2_count_free_inodes(sb);
Badari Pulavarty22352192007-07-15 23:41:58 -07001290 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 buf->f_namelen = EXT2_NAME_LEN;
Pekka Enberge4fca012006-12-06 20:35:27 -08001292 fsid = le64_to_cpup((void *)es->s_uuid) ^
1293 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1294 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1295 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 return 0;
1297}
1298
David Howells454e2392006-06-23 02:02:57 -07001299static int ext2_get_sb(struct file_system_type *fs_type,
1300 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301{
David Howells454e2392006-06-23 02:02:57 -07001302 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303}
1304
1305#ifdef CONFIG_QUOTA
1306
1307/* Read data from quotafile - avoid pagecache and such because we cannot afford
1308 * acquiring the locks... As quota files are never truncated and quota code
1309 * itself serializes the operations (and noone else should touch the files)
1310 * we don't have to be afraid of races */
1311static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1312 size_t len, loff_t off)
1313{
1314 struct inode *inode = sb_dqopt(sb)->files[type];
1315 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1316 int err = 0;
1317 int offset = off & (sb->s_blocksize - 1);
1318 int tocopy;
1319 size_t toread;
1320 struct buffer_head tmp_bh;
1321 struct buffer_head *bh;
1322 loff_t i_size = i_size_read(inode);
1323
1324 if (off > i_size)
1325 return 0;
1326 if (off+len > i_size)
1327 len = i_size-off;
1328 toread = len;
1329 while (toread > 0) {
1330 tocopy = sb->s_blocksize - offset < toread ?
1331 sb->s_blocksize - offset : toread;
1332
1333 tmp_bh.b_state = 0;
Manish Katiyarc16831b2009-02-12 21:57:04 +01001334 tmp_bh.b_size = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 err = ext2_get_block(inode, blk, &tmp_bh, 0);
Martin J. Bligha686cd82007-10-16 23:30:46 -07001336 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 return err;
1338 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1339 memset(data, 0, tocopy);
1340 else {
1341 bh = sb_bread(sb, tmp_bh.b_blocknr);
1342 if (!bh)
1343 return -EIO;
1344 memcpy(data, bh->b_data+offset, tocopy);
1345 brelse(bh);
1346 }
1347 offset = 0;
1348 toread -= tocopy;
1349 data += tocopy;
1350 blk++;
1351 }
1352 return len;
1353}
1354
1355/* Write to quotafile */
1356static ssize_t ext2_quota_write(struct super_block *sb, int type,
1357 const char *data, size_t len, loff_t off)
1358{
1359 struct inode *inode = sb_dqopt(sb)->files[type];
1360 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1361 int err = 0;
1362 int offset = off & (sb->s_blocksize - 1);
1363 int tocopy;
1364 size_t towrite = len;
1365 struct buffer_head tmp_bh;
1366 struct buffer_head *bh;
1367
Arjan van de Ven5c81a412006-07-03 00:25:20 -07001368 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 while (towrite > 0) {
1370 tocopy = sb->s_blocksize - offset < towrite ?
1371 sb->s_blocksize - offset : towrite;
1372
1373 tmp_bh.b_state = 0;
1374 err = ext2_get_block(inode, blk, &tmp_bh, 1);
Martin J. Bligha686cd82007-10-16 23:30:46 -07001375 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 goto out;
1377 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1378 bh = sb_bread(sb, tmp_bh.b_blocknr);
1379 else
1380 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1381 if (!bh) {
1382 err = -EIO;
1383 goto out;
1384 }
1385 lock_buffer(bh);
1386 memcpy(bh->b_data+offset, data, tocopy);
1387 flush_dcache_page(bh->b_page);
1388 set_buffer_uptodate(bh);
1389 mark_buffer_dirty(bh);
1390 unlock_buffer(bh);
1391 brelse(bh);
1392 offset = 0;
1393 towrite -= tocopy;
1394 data += tocopy;
1395 blk++;
1396 }
1397out:
1398 if (len == towrite)
1399 return err;
1400 if (inode->i_size < off+len-towrite)
1401 i_size_write(inode, off+len-towrite);
1402 inode->i_version++;
1403 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1404 mark_inode_dirty(inode);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001405 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 return len - towrite;
1407}
1408
1409#endif
1410
1411static struct file_system_type ext2_fs_type = {
1412 .owner = THIS_MODULE,
1413 .name = "ext2",
1414 .get_sb = ext2_get_sb,
1415 .kill_sb = kill_block_super,
1416 .fs_flags = FS_REQUIRES_DEV,
1417};
1418
1419static int __init init_ext2_fs(void)
1420{
1421 int err = init_ext2_xattr();
1422 if (err)
1423 return err;
1424 err = init_inodecache();
1425 if (err)
1426 goto out1;
1427 err = register_filesystem(&ext2_fs_type);
1428 if (err)
1429 goto out;
1430 return 0;
1431out:
1432 destroy_inodecache();
1433out1:
1434 exit_ext2_xattr();
1435 return err;
1436}
1437
1438static void __exit exit_ext2_fs(void)
1439{
1440 unregister_filesystem(&ext2_fs_type);
1441 destroy_inodecache();
1442 exit_ext2_xattr();
1443}
1444
1445module_init(init_ext2_fs)
1446module_exit(exit_ext2_fs)