Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ext2/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/string.h> | |
8fc2751b | 21 | #include <linux/fs.h> |
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/parser.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/buffer_head.h> | |
a5694255 | 28 | #include <linux/exportfs.h> |
1da177e4 | 29 | #include <linux/vfs.h> |
8fc2751b MB |
30 | #include <linux/seq_file.h> |
31 | #include <linux/mount.h> | |
d8ea6cf8 | 32 | #include <linux/log2.h> |
74abb989 | 33 | #include <linux/quotaops.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include "ext2.h" | |
36 | #include "xattr.h" | |
37 | #include "acl.h" | |
38 | ||
39 | static void ext2_sync_super(struct super_block *sb, | |
ee6921eb | 40 | struct ext2_super_block *es, int wait); |
1da177e4 | 41 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 42 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 43 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1e8b212f JK |
44 | static int ext2_freeze(struct super_block *sb); |
45 | static int ext2_unfreeze(struct super_block *sb); | |
1da177e4 | 46 | |
23a2ad6d JP |
47 | void ext2_error(struct super_block *sb, const char *function, |
48 | const char *fmt, ...) | |
1da177e4 | 49 | { |
23a2ad6d | 50 | struct va_format vaf; |
1da177e4 LT |
51 | va_list args; |
52 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
53 | struct ext2_super_block *es = sbi->s_es; | |
54 | ||
55 | if (!(sb->s_flags & MS_RDONLY)) { | |
c15271f4 | 56 | spin_lock(&sbi->s_lock); |
1da177e4 | 57 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 58 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 59 | spin_unlock(&sbi->s_lock); |
ee6921eb | 60 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
61 | } |
62 | ||
63 | va_start(args, fmt); | |
23a2ad6d JP |
64 | |
65 | vaf.fmt = fmt; | |
66 | vaf.va = &args; | |
67 | ||
68 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", | |
69 | sb->s_id, function, &vaf); | |
70 | ||
1da177e4 LT |
71 | va_end(args); |
72 | ||
73 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 74 | panic("EXT2-fs: panic from previous error\n"); |
1da177e4 | 75 | if (test_opt(sb, ERRORS_RO)) { |
2314b07c AF |
76 | ext2_msg(sb, KERN_CRIT, |
77 | "error: remounting filesystem read-only"); | |
1da177e4 LT |
78 | sb->s_flags |= MS_RDONLY; |
79 | } | |
80 | } | |
81 | ||
2314b07c AF |
82 | void ext2_msg(struct super_block *sb, const char *prefix, |
83 | const char *fmt, ...) | |
1da177e4 | 84 | { |
23a2ad6d | 85 | struct va_format vaf; |
1da177e4 LT |
86 | va_list args; |
87 | ||
88 | va_start(args, fmt); | |
23a2ad6d JP |
89 | |
90 | vaf.fmt = fmt; | |
91 | vaf.va = &args; | |
92 | ||
93 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); | |
94 | ||
1da177e4 LT |
95 | va_end(args); |
96 | } | |
97 | ||
c15271f4 JB |
98 | /* |
99 | * This must be called with sbi->s_lock held. | |
100 | */ | |
1da177e4 LT |
101 | void ext2_update_dynamic_rev(struct super_block *sb) |
102 | { | |
103 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
104 | ||
105 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
106 | return; | |
107 | ||
2314b07c AF |
108 | ext2_msg(sb, KERN_WARNING, |
109 | "warning: updating to rev %d because of " | |
110 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
111 | EXT2_DYNAMIC_REV); |
112 | ||
113 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
114 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
115 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
116 | /* leave es->s_feature_*compat flags alone */ | |
117 | /* es->s_uuid will be set by e2fsck if empty */ | |
118 | ||
119 | /* | |
120 | * The rest of the superblock fields should be zero, and if not it | |
121 | * means they are likely already in use, so leave them alone. We | |
122 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
123 | */ | |
124 | } | |
125 | ||
126 | static void ext2_put_super (struct super_block * sb) | |
127 | { | |
128 | int db_count; | |
129 | int i; | |
130 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
131 | ||
e0ccfd95 CH |
132 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
133 | ||
1da177e4 LT |
134 | ext2_xattr_put_super(sb); |
135 | if (!(sb->s_flags & MS_RDONLY)) { | |
136 | struct ext2_super_block *es = sbi->s_es; | |
137 | ||
c15271f4 | 138 | spin_lock(&sbi->s_lock); |
1da177e4 | 139 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 140 | spin_unlock(&sbi->s_lock); |
ee6921eb | 141 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
142 | } |
143 | db_count = sbi->s_gdb_count; | |
144 | for (i = 0; i < db_count; i++) | |
145 | if (sbi->s_group_desc[i]) | |
146 | brelse (sbi->s_group_desc[i]); | |
147 | kfree(sbi->s_group_desc); | |
148 | kfree(sbi->s_debts); | |
149 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
150 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
151 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
152 | brelse (sbi->s_sbh); | |
153 | sb->s_fs_info = NULL; | |
18a82eb9 | 154 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 155 | kfree(sbi); |
1da177e4 LT |
156 | } |
157 | ||
e18b890b | 158 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
159 | |
160 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
161 | { | |
162 | struct ext2_inode_info *ei; | |
e625b310 | 163 | ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
164 | if (!ei) |
165 | return NULL; | |
a686cd89 | 166 | ei->i_block_alloc_info = NULL; |
1da177e4 | 167 | ei->vfs_inode.i_version = 1; |
64241118 JK |
168 | #ifdef CONFIG_QUOTA |
169 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); | |
170 | #endif | |
171 | ||
1da177e4 LT |
172 | return &ei->vfs_inode; |
173 | } | |
174 | ||
fa0d7e3d | 175 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 176 | { |
fa0d7e3d | 177 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
178 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
179 | } | |
180 | ||
fa0d7e3d NP |
181 | static void ext2_destroy_inode(struct inode *inode) |
182 | { | |
183 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
184 | } | |
185 | ||
51cc5068 | 186 | static void init_once(void *foo) |
1da177e4 LT |
187 | { |
188 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
189 | ||
a35afb83 | 190 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 191 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 192 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 193 | #endif |
a686cd89 | 194 | mutex_init(&ei->truncate_mutex); |
a35afb83 | 195 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 196 | } |
20c2df83 | 197 | |
0903353a | 198 | static int __init init_inodecache(void) |
1da177e4 LT |
199 | { |
200 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
201 | sizeof(struct ext2_inode_info), | |
fffb60f9 PJ |
202 | 0, (SLAB_RECLAIM_ACCOUNT| |
203 | SLAB_MEM_SPREAD), | |
20c2df83 | 204 | init_once); |
1da177e4 LT |
205 | if (ext2_inode_cachep == NULL) |
206 | return -ENOMEM; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static void destroy_inodecache(void) | |
211 | { | |
8c0a8537 KS |
212 | /* |
213 | * Make sure all delayed rcu free inodes are flushed before we | |
214 | * destroy cache. | |
215 | */ | |
216 | rcu_barrier(); | |
1a1d92c1 | 217 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
218 | } |
219 | ||
34c80b1d | 220 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
8fc2751b | 221 | { |
34c80b1d | 222 | struct super_block *sb = root->d_sb; |
93d44cb2 MS |
223 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
224 | struct ext2_super_block *es = sbi->s_es; | |
225 | unsigned long def_mount_opts; | |
8fc2751b | 226 | |
c15271f4 | 227 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
228 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
229 | ||
230 | if (sbi->s_sb_block != 1) | |
231 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
232 | if (test_opt(sb, MINIX_DF)) | |
233 | seq_puts(seq, ",minixdf"); | |
234 | if (test_opt(sb, GRPID)) | |
8fc2751b | 235 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
236 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
237 | seq_puts(seq, ",nogrpid"); | |
b8a9f9e1 | 238 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
93d44cb2 | 239 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
b8a9f9e1 EB |
240 | seq_printf(seq, ",resuid=%u", |
241 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); | |
93d44cb2 | 242 | } |
b8a9f9e1 | 243 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
93d44cb2 | 244 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
b8a9f9e1 EB |
245 | seq_printf(seq, ",resgid=%u", |
246 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); | |
93d44cb2 | 247 | } |
14e11e10 | 248 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
249 | int def_errors = le16_to_cpu(es->s_errors); |
250 | ||
251 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
252 | def_errors == EXT2_ERRORS_CONTINUE) { |
253 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
254 | } |
255 | } | |
14e11e10 AK |
256 | if (test_opt(sb, ERRORS_CONT)) |
257 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
258 | if (test_opt(sb, ERRORS_PANIC)) |
259 | seq_puts(seq, ",errors=panic"); | |
260 | if (test_opt(sb, NO_UID32)) | |
261 | seq_puts(seq, ",nouid32"); | |
262 | if (test_opt(sb, DEBUG)) | |
263 | seq_puts(seq, ",debug"); | |
264 | if (test_opt(sb, OLDALLOC)) | |
265 | seq_puts(seq, ",oldalloc"); | |
266 | ||
267 | #ifdef CONFIG_EXT2_FS_XATTR | |
268 | if (test_opt(sb, XATTR_USER)) | |
269 | seq_puts(seq, ",user_xattr"); | |
270 | if (!test_opt(sb, XATTR_USER) && | |
271 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
272 | seq_puts(seq, ",nouser_xattr"); | |
273 | } | |
274 | #endif | |
275 | ||
276 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
277 | if (test_opt(sb, POSIX_ACL)) | |
278 | seq_puts(seq, ",acl"); | |
279 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
280 | seq_puts(seq, ",noacl"); | |
281 | #endif | |
282 | ||
283 | if (test_opt(sb, NOBH)) | |
284 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
285 | |
286 | #if defined(CONFIG_QUOTA) | |
287 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
288 | seq_puts(seq, ",usrquota"); | |
289 | ||
290 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
291 | seq_puts(seq, ",grpquota"); | |
292 | #endif | |
293 | ||
83541796 CO |
294 | #if defined(CONFIG_EXT2_FS_XIP) |
295 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) | |
296 | seq_puts(seq, ",xip"); | |
297 | #endif | |
298 | ||
35c879dc MS |
299 | if (!test_opt(sb, RESERVATION)) |
300 | seq_puts(seq, ",noreservation"); | |
301 | ||
c15271f4 | 302 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
303 | return 0; |
304 | } | |
305 | ||
1da177e4 LT |
306 | #ifdef CONFIG_QUOTA |
307 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
308 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
64241118 JK |
309 | static struct dquot **ext2_get_dquots(struct inode *inode) |
310 | { | |
311 | return EXT2_I(inode)->i_dquot; | |
312 | } | |
1da177e4 LT |
313 | #endif |
314 | ||
ee9b6d61 | 315 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
316 | .alloc_inode = ext2_alloc_inode, |
317 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 318 | .write_inode = ext2_write_inode, |
72edc4d0 | 319 | .evict_inode = ext2_evict_inode, |
1da177e4 | 320 | .put_super = ext2_put_super, |
40f31dd4 | 321 | .sync_fs = ext2_sync_fs, |
1e8b212f JK |
322 | .freeze_fs = ext2_freeze, |
323 | .unfreeze_fs = ext2_unfreeze, | |
1da177e4 LT |
324 | .statfs = ext2_statfs, |
325 | .remount_fs = ext2_remount, | |
8fc2751b | 326 | .show_options = ext2_show_options, |
1da177e4 LT |
327 | #ifdef CONFIG_QUOTA |
328 | .quota_read = ext2_quota_read, | |
329 | .quota_write = ext2_quota_write, | |
64241118 | 330 | .get_dquots = ext2_get_dquots, |
1da177e4 LT |
331 | #endif |
332 | }; | |
333 | ||
2e4c68e3 CH |
334 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
335 | u64 ino, u32 generation) | |
ecaff756 | 336 | { |
ecaff756 | 337 | struct inode *inode; |
ecaff756 N |
338 | |
339 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
340 | return ERR_PTR(-ESTALE); | |
341 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
342 | return ERR_PTR(-ESTALE); | |
343 | ||
f32948dd LH |
344 | /* |
345 | * ext2_iget isn't quite right if the inode is currently unallocated! | |
346 | * However ext2_iget currently does appropriate checks to handle stale | |
347 | * inodes so everything is OK. | |
ecaff756 | 348 | */ |
52fcf703 DH |
349 | inode = ext2_iget(sb, ino); |
350 | if (IS_ERR(inode)) | |
351 | return ERR_CAST(inode); | |
352 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
353 | /* we didn't find the right inode.. */ |
354 | iput(inode); | |
355 | return ERR_PTR(-ESTALE); | |
356 | } | |
2e4c68e3 CH |
357 | return inode; |
358 | } | |
359 | ||
360 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
361 | int fh_len, int fh_type) | |
362 | { | |
363 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
364 | ext2_nfs_get_inode); | |
365 | } | |
366 | ||
367 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
368 | int fh_len, int fh_type) | |
369 | { | |
370 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
371 | ext2_nfs_get_inode); | |
ecaff756 N |
372 | } |
373 | ||
39655164 | 374 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
375 | .fh_to_dentry = ext2_fh_to_dentry, |
376 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
377 | .get_parent = ext2_get_parent, |
378 | }; | |
379 | ||
380 | static unsigned long get_sb_block(void **data) | |
381 | { | |
382 | unsigned long sb_block; | |
383 | char *options = (char *) *data; | |
384 | ||
385 | if (!options || strncmp(options, "sb=", 3) != 0) | |
386 | return 1; /* Default location */ | |
387 | options += 3; | |
388 | sb_block = simple_strtoul(options, &options, 0); | |
389 | if (*options && *options != ',') { | |
390 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
391 | (char *) *data); | |
392 | return 1; | |
393 | } | |
394 | if (*options == ',') | |
395 | options++; | |
396 | *data = (void *) options; | |
397 | return sb_block; | |
398 | } | |
399 | ||
400 | enum { | |
401 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 402 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 403 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b MB |
404 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
405 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, | |
a686cd89 | 406 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
407 | }; |
408 | ||
a447c093 | 409 | static const match_table_t tokens = { |
1da177e4 LT |
410 | {Opt_bsd_df, "bsddf"}, |
411 | {Opt_minix_df, "minixdf"}, | |
412 | {Opt_grpid, "grpid"}, | |
413 | {Opt_grpid, "bsdgroups"}, | |
414 | {Opt_nogrpid, "nogrpid"}, | |
415 | {Opt_nogrpid, "sysvgroups"}, | |
416 | {Opt_resgid, "resgid=%u"}, | |
417 | {Opt_resuid, "resuid=%u"}, | |
418 | {Opt_sb, "sb=%u"}, | |
419 | {Opt_err_cont, "errors=continue"}, | |
420 | {Opt_err_panic, "errors=panic"}, | |
421 | {Opt_err_ro, "errors=remount-ro"}, | |
422 | {Opt_nouid32, "nouid32"}, | |
423 | {Opt_nocheck, "check=none"}, | |
424 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
425 | {Opt_debug, "debug"}, |
426 | {Opt_oldalloc, "oldalloc"}, | |
427 | {Opt_orlov, "orlov"}, | |
428 | {Opt_nobh, "nobh"}, | |
429 | {Opt_user_xattr, "user_xattr"}, | |
430 | {Opt_nouser_xattr, "nouser_xattr"}, | |
431 | {Opt_acl, "acl"}, | |
432 | {Opt_noacl, "noacl"}, | |
6d79125b | 433 | {Opt_xip, "xip"}, |
8fc2751b | 434 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 435 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
436 | {Opt_quota, "quota"}, |
437 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
438 | {Opt_reservation, "reservation"}, |
439 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
440 | {Opt_err, NULL} |
441 | }; | |
442 | ||
2314b07c | 443 | static int parse_options(char *options, struct super_block *sb) |
1da177e4 | 444 | { |
2314b07c AF |
445 | char *p; |
446 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1da177e4 | 447 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 | 448 | int option; |
b8a9f9e1 EB |
449 | kuid_t uid; |
450 | kgid_t gid; | |
1da177e4 LT |
451 | |
452 | if (!options) | |
453 | return 1; | |
454 | ||
455 | while ((p = strsep (&options, ",")) != NULL) { | |
456 | int token; | |
457 | if (!*p) | |
458 | continue; | |
459 | ||
460 | token = match_token(p, tokens, args); | |
461 | switch (token) { | |
462 | case Opt_bsd_df: | |
463 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
464 | break; | |
465 | case Opt_minix_df: | |
466 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
467 | break; | |
468 | case Opt_grpid: | |
469 | set_opt (sbi->s_mount_opt, GRPID); | |
470 | break; | |
471 | case Opt_nogrpid: | |
472 | clear_opt (sbi->s_mount_opt, GRPID); | |
473 | break; | |
474 | case Opt_resuid: | |
475 | if (match_int(&args[0], &option)) | |
476 | return 0; | |
b8a9f9e1 EB |
477 | uid = make_kuid(current_user_ns(), option); |
478 | if (!uid_valid(uid)) { | |
479 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); | |
ae2cf428 | 480 | return 0; |
b8a9f9e1 EB |
481 | |
482 | } | |
483 | sbi->s_resuid = uid; | |
1da177e4 LT |
484 | break; |
485 | case Opt_resgid: | |
486 | if (match_int(&args[0], &option)) | |
487 | return 0; | |
b8a9f9e1 EB |
488 | gid = make_kgid(current_user_ns(), option); |
489 | if (!gid_valid(gid)) { | |
490 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); | |
ae2cf428 | 491 | return 0; |
b8a9f9e1 EB |
492 | } |
493 | sbi->s_resgid = gid; | |
1da177e4 LT |
494 | break; |
495 | case Opt_sb: | |
496 | /* handled by get_sb_block() instead of here */ | |
497 | /* *sb_block = match_int(&args[0]); */ | |
498 | break; | |
499 | case Opt_err_panic: | |
5a2b4062 VA |
500 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
501 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
502 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
503 | break; |
504 | case Opt_err_ro: | |
5a2b4062 VA |
505 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
506 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
507 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
508 | break; |
509 | case Opt_err_cont: | |
5a2b4062 VA |
510 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
511 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
512 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
513 | break; |
514 | case Opt_nouid32: | |
515 | set_opt (sbi->s_mount_opt, NO_UID32); | |
516 | break; | |
1da177e4 LT |
517 | case Opt_nocheck: |
518 | clear_opt (sbi->s_mount_opt, CHECK); | |
519 | break; | |
520 | case Opt_debug: | |
521 | set_opt (sbi->s_mount_opt, DEBUG); | |
522 | break; | |
523 | case Opt_oldalloc: | |
524 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
525 | break; | |
526 | case Opt_orlov: | |
527 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
528 | break; | |
529 | case Opt_nobh: | |
530 | set_opt (sbi->s_mount_opt, NOBH); | |
531 | break; | |
532 | #ifdef CONFIG_EXT2_FS_XATTR | |
533 | case Opt_user_xattr: | |
534 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
535 | break; | |
536 | case Opt_nouser_xattr: | |
537 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
538 | break; | |
539 | #else | |
540 | case Opt_user_xattr: | |
541 | case Opt_nouser_xattr: | |
2314b07c AF |
542 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
543 | "not supported"); | |
1da177e4 LT |
544 | break; |
545 | #endif | |
546 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
547 | case Opt_acl: | |
548 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
549 | break; | |
550 | case Opt_noacl: | |
551 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
552 | break; | |
553 | #else | |
554 | case Opt_acl: | |
555 | case Opt_noacl: | |
2314b07c AF |
556 | ext2_msg(sb, KERN_INFO, |
557 | "(no)acl options not supported"); | |
1da177e4 LT |
558 | break; |
559 | #endif | |
6d79125b CO |
560 | case Opt_xip: |
561 | #ifdef CONFIG_EXT2_FS_XIP | |
562 | set_opt (sbi->s_mount_opt, XIP); | |
563 | #else | |
2314b07c | 564 | ext2_msg(sb, KERN_INFO, "xip option not supported"); |
6d79125b CO |
565 | #endif |
566 | break; | |
8fc2751b MB |
567 | |
568 | #if defined(CONFIG_QUOTA) | |
569 | case Opt_quota: | |
570 | case Opt_usrquota: | |
571 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
572 | break; | |
573 | ||
574 | case Opt_grpquota: | |
575 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
576 | break; | |
577 | #else | |
578 | case Opt_quota: | |
579 | case Opt_usrquota: | |
580 | case Opt_grpquota: | |
2314b07c AF |
581 | ext2_msg(sb, KERN_INFO, |
582 | "quota operations not supported"); | |
8fc2751b MB |
583 | break; |
584 | #endif | |
585 | ||
a686cd89 MB |
586 | case Opt_reservation: |
587 | set_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 588 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
589 | break; |
590 | case Opt_noreservation: | |
591 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 592 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 593 | break; |
1da177e4 LT |
594 | case Opt_ignore: |
595 | break; | |
596 | default: | |
597 | return 0; | |
598 | } | |
599 | } | |
1da177e4 LT |
600 | return 1; |
601 | } | |
602 | ||
603 | static int ext2_setup_super (struct super_block * sb, | |
604 | struct ext2_super_block * es, | |
605 | int read_only) | |
606 | { | |
607 | int res = 0; | |
608 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
609 | ||
610 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c AF |
611 | ext2_msg(sb, KERN_ERR, |
612 | "error: revision level too high, " | |
613 | "forcing read-only mode"); | |
1da177e4 LT |
614 | res = MS_RDONLY; |
615 | } | |
616 | if (read_only) | |
617 | return res; | |
618 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c AF |
619 | ext2_msg(sb, KERN_WARNING, |
620 | "warning: mounting unchecked fs, " | |
621 | "running e2fsck is recommended"); | |
1da177e4 | 622 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c AF |
623 | ext2_msg(sb, KERN_WARNING, |
624 | "warning: mounting fs with errors, " | |
625 | "running e2fsck is recommended"); | |
1da177e4 LT |
626 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
627 | le16_to_cpu(es->s_mnt_count) >= | |
628 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c AF |
629 | ext2_msg(sb, KERN_WARNING, |
630 | "warning: maximal mount count reached, " | |
631 | "running e2fsck is recommended"); | |
1da177e4 | 632 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c AF |
633 | (le32_to_cpu(es->s_lastcheck) + |
634 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
635 | ext2_msg(sb, KERN_WARNING, | |
636 | "warning: checktime reached, " | |
637 | "running e2fsck is recommended"); | |
1da177e4 LT |
638 | if (!le16_to_cpu(es->s_max_mnt_count)) |
639 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 640 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 641 | if (test_opt (sb, DEBUG)) |
2314b07c AF |
642 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
643 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
644 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
645 | sbi->s_frag_size, | |
646 | sbi->s_groups_count, | |
647 | EXT2_BLOCKS_PER_GROUP(sb), | |
648 | EXT2_INODES_PER_GROUP(sb), | |
649 | sbi->s_mount_opt); | |
1da177e4 LT |
650 | return res; |
651 | } | |
652 | ||
197cd65a | 653 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
654 | { |
655 | int i; | |
1da177e4 | 656 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
657 | |
658 | ext2_debug ("Checking group descriptors"); | |
659 | ||
197cd65a AM |
660 | for (i = 0; i < sbi->s_groups_count; i++) { |
661 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
662 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
663 | ext2_fsblk_t last_block; | |
197cd65a | 664 | |
41f04d85 ES |
665 | if (i == sbi->s_groups_count - 1) |
666 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
667 | else | |
668 | last_block = first_block + | |
669 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
670 | ||
41f04d85 ES |
671 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
672 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
673 | { |
674 | ext2_error (sb, "ext2_check_descriptors", | |
675 | "Block bitmap for group %d" | |
676 | " not in group (block %lu)!", | |
677 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
678 | return 0; | |
679 | } | |
41f04d85 ES |
680 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
681 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
682 | { |
683 | ext2_error (sb, "ext2_check_descriptors", | |
684 | "Inode bitmap for group %d" | |
685 | " not in group (block %lu)!", | |
686 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
687 | return 0; | |
688 | } | |
41f04d85 | 689 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 690 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 691 | last_block) |
1da177e4 LT |
692 | { |
693 | ext2_error (sb, "ext2_check_descriptors", | |
694 | "Inode table for group %d" | |
695 | " not in group (block %lu)!", | |
696 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
697 | return 0; | |
698 | } | |
1da177e4 LT |
699 | } |
700 | return 1; | |
701 | } | |
702 | ||
1da177e4 LT |
703 | /* |
704 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
705 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
706 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
707 | */ | |
708 | static loff_t ext2_max_size(int bits) | |
709 | { | |
710 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
711 | int meta_blocks; |
712 | loff_t upper_limit; | |
713 | ||
714 | /* This is calculated to be the largest file size for a | |
715 | * dense, file such that the total number of | |
1da177e4 | 716 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
717 | * does not exceed 2^32 -1 |
718 | * __u32 i_blocks representing the total number of | |
719 | * 512 bytes blocks of the file | |
720 | */ | |
721 | upper_limit = (1LL << 32) - 1; | |
722 | ||
723 | /* total blocks in file system block size */ | |
724 | upper_limit >>= (bits - 9); | |
725 | ||
726 | ||
727 | /* indirect blocks */ | |
728 | meta_blocks = 1; | |
729 | /* double indirect blocks */ | |
730 | meta_blocks += 1 + (1LL << (bits-2)); | |
731 | /* tripple indirect blocks */ | |
732 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
733 | ||
734 | upper_limit -= meta_blocks; | |
735 | upper_limit <<= bits; | |
1da177e4 LT |
736 | |
737 | res += 1LL << (bits-2); | |
738 | res += 1LL << (2*(bits-2)); | |
739 | res += 1LL << (3*(bits-2)); | |
740 | res <<= bits; | |
741 | if (res > upper_limit) | |
742 | res = upper_limit; | |
902be4c5 AK |
743 | |
744 | if (res > MAX_LFS_FILESIZE) | |
745 | res = MAX_LFS_FILESIZE; | |
746 | ||
1da177e4 LT |
747 | return res; |
748 | } | |
749 | ||
750 | static unsigned long descriptor_loc(struct super_block *sb, | |
751 | unsigned long logic_sb_block, | |
752 | int nr) | |
753 | { | |
754 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 755 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
756 | int has_super = 0; |
757 | ||
1da177e4 LT |
758 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
759 | ||
760 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
761 | nr < first_meta_bg) | |
762 | return (logic_sb_block + nr + 1); | |
763 | bg = sbi->s_desc_per_block * nr; | |
764 | if (ext2_bg_has_super(sb, bg)) | |
765 | has_super = 1; | |
24097d12 AM |
766 | |
767 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
768 | } |
769 | ||
770 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
771 | { | |
772 | struct buffer_head * bh; | |
773 | struct ext2_sb_info * sbi; | |
774 | struct ext2_super_block * es; | |
775 | struct inode *root; | |
776 | unsigned long block; | |
777 | unsigned long sb_block = get_sb_block(&data); | |
778 | unsigned long logic_sb_block; | |
779 | unsigned long offset = 0; | |
780 | unsigned long def_mount_opts; | |
52fcf703 | 781 | long ret = -EINVAL; |
1da177e4 LT |
782 | int blocksize = BLOCK_SIZE; |
783 | int db_count; | |
784 | int i, j; | |
785 | __le32 features; | |
833f4077 | 786 | int err; |
1da177e4 | 787 | |
db719222 | 788 | err = -ENOMEM; |
f8314dc6 | 789 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 790 | if (!sbi) |
e124a320 | 791 | goto failed; |
18a82eb9 PE |
792 | |
793 | sbi->s_blockgroup_lock = | |
794 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
795 | if (!sbi->s_blockgroup_lock) { | |
796 | kfree(sbi); | |
e124a320 | 797 | goto failed; |
18a82eb9 | 798 | } |
1da177e4 | 799 | sb->s_fs_info = sbi; |
93d44cb2 | 800 | sbi->s_sb_block = sb_block; |
1da177e4 | 801 | |
c15271f4 JB |
802 | spin_lock_init(&sbi->s_lock); |
803 | ||
1da177e4 LT |
804 | /* |
805 | * See what the current blocksize for the device is, and | |
806 | * use that as the blocksize. Otherwise (or if the blocksize | |
807 | * is smaller than the default) use the default. | |
808 | * This is important for devices that have a hardware | |
809 | * sectorsize that is larger than the default. | |
810 | */ | |
811 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
812 | if (!blocksize) { | |
2314b07c | 813 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
814 | goto failed_sbi; |
815 | } | |
816 | ||
817 | /* | |
818 | * If the superblock doesn't start on a hardware sector boundary, | |
819 | * calculate the offset. | |
820 | */ | |
821 | if (blocksize != BLOCK_SIZE) { | |
822 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
823 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
824 | } else { | |
825 | logic_sb_block = sb_block; | |
826 | } | |
827 | ||
828 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 829 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
830 | goto failed_sbi; |
831 | } | |
832 | /* | |
833 | * Note: s_es must be initialized as soon as possible because | |
834 | * some ext2 macro-instructions depend on its value | |
835 | */ | |
836 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
837 | sbi->s_es = es; | |
838 | sb->s_magic = le16_to_cpu(es->s_magic); | |
839 | ||
840 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
841 | goto cantfind_ext2; | |
842 | ||
843 | /* Set defaults before we parse the mount options */ | |
844 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
845 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
846 | set_opt(sbi->s_mount_opt, DEBUG); | |
847 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
848 | set_opt(sbi->s_mount_opt, GRPID); | |
849 | if (def_mount_opts & EXT2_DEFM_UID16) | |
850 | set_opt(sbi->s_mount_opt, NO_UID32); | |
2e7842b8 | 851 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 LT |
852 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
853 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
2e7842b8 HD |
854 | #endif |
855 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 LT |
856 | if (def_mount_opts & EXT2_DEFM_ACL) |
857 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
2e7842b8 | 858 | #endif |
1da177e4 LT |
859 | |
860 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
861 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
14e11e10 | 862 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
5a2b4062 | 863 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
14e11e10 AK |
864 | else |
865 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 | 866 | |
b8a9f9e1 EB |
867 | sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
868 | sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 869 | |
a686cd89 MB |
870 | set_opt(sbi->s_mount_opt, RESERVATION); |
871 | ||
2314b07c | 872 | if (!parse_options((char *) data, sb)) |
1da177e4 LT |
873 | goto failed_mount; |
874 | ||
875 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
876 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
877 | MS_POSIXACL : 0); | |
878 | ||
879 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
880 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
881 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
882 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c AF |
883 | ext2_msg(sb, KERN_WARNING, |
884 | "warning: feature flags set on rev 0 fs, " | |
885 | "running e2fsck is recommended"); | |
1da177e4 LT |
886 | /* |
887 | * Check feature flags regardless of the revision level, since we | |
888 | * previously didn't change the revision level when setting the flags, | |
889 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
890 | */ | |
891 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
892 | if (features) { | |
2314b07c AF |
893 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
894 | "unsupported optional features (%x)", | |
895 | le32_to_cpu(features)); | |
1da177e4 LT |
896 | goto failed_mount; |
897 | } | |
898 | if (!(sb->s_flags & MS_RDONLY) && | |
899 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
2314b07c AF |
900 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
901 | "unsupported optional features (%x)", | |
902 | le32_to_cpu(features)); | |
1da177e4 LT |
903 | goto failed_mount; |
904 | } | |
905 | ||
906 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
907 | ||
0de4830f MW |
908 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) { |
909 | if (blocksize != PAGE_SIZE) { | |
2314b07c | 910 | ext2_msg(sb, KERN_ERR, |
0de4830f MW |
911 | "error: unsupported blocksize for xip"); |
912 | goto failed_mount; | |
913 | } | |
914 | if (!sb->s_bdev->bd_disk->fops->direct_access) { | |
915 | ext2_msg(sb, KERN_ERR, | |
916 | "error: device does not support xip"); | |
917 | goto failed_mount; | |
918 | } | |
6d79125b CO |
919 | } |
920 | ||
1da177e4 LT |
921 | /* If the blocksize doesn't match, re-read the thing.. */ |
922 | if (sb->s_blocksize != blocksize) { | |
923 | brelse(bh); | |
924 | ||
925 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
926 | ext2_msg(sb, KERN_ERR, |
927 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
928 | goto failed_sbi; |
929 | } | |
930 | ||
931 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
932 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
933 | bh = sb_bread(sb, logic_sb_block); | |
934 | if(!bh) { | |
2314b07c AF |
935 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
936 | "superblock on 2nd try"); | |
1da177e4 LT |
937 | goto failed_sbi; |
938 | } | |
939 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
940 | sbi->s_es = es; | |
941 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 942 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
943 | goto failed_mount; |
944 | } | |
945 | } | |
946 | ||
947 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 948 | sb->s_max_links = EXT2_LINK_MAX; |
1da177e4 LT |
949 | |
950 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
951 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
952 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
953 | } else { | |
954 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
955 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
956 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 957 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 958 | (sbi->s_inode_size > blocksize)) { |
2314b07c AF |
959 | ext2_msg(sb, KERN_ERR, |
960 | "error: unsupported inode size: %d", | |
1da177e4 LT |
961 | sbi->s_inode_size); |
962 | goto failed_mount; | |
963 | } | |
964 | } | |
965 | ||
966 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
967 | le32_to_cpu(es->s_log_frag_size); | |
968 | if (sbi->s_frag_size == 0) | |
969 | goto cantfind_ext2; | |
970 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
971 | ||
972 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
973 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
974 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
975 | ||
976 | if (EXT2_INODE_SIZE(sb) == 0) | |
977 | goto cantfind_ext2; | |
978 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 979 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
980 | goto cantfind_ext2; |
981 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
982 | sbi->s_inodes_per_block; | |
983 | sbi->s_desc_per_block = sb->s_blocksize / | |
984 | sizeof (struct ext2_group_desc); | |
985 | sbi->s_sbh = bh; | |
986 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
987 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 988 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 989 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 990 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
991 | |
992 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
993 | goto cantfind_ext2; | |
994 | ||
995 | if (sb->s_blocksize != bh->b_size) { | |
996 | if (!silent) | |
2314b07c | 997 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
998 | goto failed_mount; |
999 | } | |
1000 | ||
1001 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c AF |
1002 | ext2_msg(sb, KERN_ERR, |
1003 | "error: fragsize %lu != blocksize %lu" | |
1004 | "(not supported yet)", | |
1da177e4 LT |
1005 | sbi->s_frag_size, sb->s_blocksize); |
1006 | goto failed_mount; | |
1007 | } | |
1008 | ||
1009 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1010 | ext2_msg(sb, KERN_ERR, |
1011 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1012 | sbi->s_blocks_per_group); |
1013 | goto failed_mount; | |
1014 | } | |
1015 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1016 | ext2_msg(sb, KERN_ERR, |
1017 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1018 | sbi->s_frags_per_group); |
1019 | goto failed_mount; | |
1020 | } | |
1021 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1022 | ext2_msg(sb, KERN_ERR, |
1023 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1024 | sbi->s_inodes_per_group); |
1025 | goto failed_mount; | |
1026 | } | |
1027 | ||
1028 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1029 | goto cantfind_ext2; | |
41f04d85 ES |
1030 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1031 | le32_to_cpu(es->s_first_data_block) - 1) | |
1032 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1033 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1034 | EXT2_DESC_PER_BLOCK(sb); | |
1035 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1036 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1037 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1038 | goto failed_mount; |
1039 | } | |
18a82eb9 | 1040 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1041 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1042 | if (!sbi->s_debts) { |
2314b07c | 1043 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1044 | goto failed_mount_group_desc; |
1045 | } | |
1da177e4 LT |
1046 | for (i = 0; i < db_count; i++) { |
1047 | block = descriptor_loc(sb, logic_sb_block, i); | |
1048 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1049 | if (!sbi->s_group_desc[i]) { | |
1050 | for (j = 0; j < i; j++) | |
1051 | brelse (sbi->s_group_desc[j]); | |
2314b07c AF |
1052 | ext2_msg(sb, KERN_ERR, |
1053 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1054 | goto failed_mount_group_desc; |
1055 | } | |
1056 | } | |
1057 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1058 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1059 | goto failed_mount2; |
1060 | } | |
1061 | sbi->s_gdb_count = db_count; | |
1062 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1063 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1064 | |
a686cd89 MB |
1065 | /* per fileystem reservation list head & lock */ |
1066 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1067 | sbi->s_rsv_window_root = RB_ROOT; | |
1068 | /* | |
1069 | * Add a single, static dummy reservation to the start of the | |
1070 | * reservation window list --- it gives us a placeholder for | |
1071 | * append-at-start-of-list which makes the allocation logic | |
1072 | * _much_ simpler. | |
1073 | */ | |
1074 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1075 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1076 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1077 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1078 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1079 | ||
833f4077 | 1080 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1081 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1082 | if (!err) { |
1083 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1084 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1085 | } |
1086 | if (!err) { | |
1087 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1088 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1089 | } |
1090 | if (err) { | |
2314b07c | 1091 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1092 | goto failed_mount3; |
1093 | } | |
1da177e4 LT |
1094 | /* |
1095 | * set up enough so that it can read an inode | |
1096 | */ | |
1097 | sb->s_op = &ext2_sops; | |
1098 | sb->s_export_op = &ext2_export_ops; | |
1099 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1100 | |
1101 | #ifdef CONFIG_QUOTA | |
1102 | sb->dq_op = &dquot_operations; | |
287a8095 | 1103 | sb->s_qcop = &dquot_quotactl_ops; |
64241118 | 1104 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1105 | #endif |
1106 | ||
52fcf703 DH |
1107 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1108 | if (IS_ERR(root)) { | |
1109 | ret = PTR_ERR(root); | |
0216bfcf | 1110 | goto failed_mount3; |
1da177e4 LT |
1111 | } |
1112 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1113 | iput(root); |
2314b07c | 1114 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1115 | goto failed_mount3; |
1da177e4 | 1116 | } |
52fcf703 | 1117 | |
48fde701 | 1118 | sb->s_root = d_make_root(root); |
52fcf703 | 1119 | if (!sb->s_root) { |
2314b07c | 1120 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1121 | ret = -ENOMEM; |
1122 | goto failed_mount3; | |
1123 | } | |
1da177e4 | 1124 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c AF |
1125 | ext2_msg(sb, KERN_WARNING, |
1126 | "warning: mounting ext3 filesystem as ext2"); | |
4c96a68b JB |
1127 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
1128 | sb->s_flags |= MS_RDONLY; | |
1129 | ext2_write_super(sb); | |
1da177e4 LT |
1130 | return 0; |
1131 | ||
1132 | cantfind_ext2: | |
1133 | if (!silent) | |
2314b07c AF |
1134 | ext2_msg(sb, KERN_ERR, |
1135 | "error: can't find an ext2 filesystem on dev %s.", | |
1136 | sb->s_id); | |
1da177e4 | 1137 | goto failed_mount; |
0216bfcf MC |
1138 | failed_mount3: |
1139 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1140 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1141 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1142 | failed_mount2: |
1143 | for (i = 0; i < db_count; i++) | |
1144 | brelse(sbi->s_group_desc[i]); | |
1145 | failed_mount_group_desc: | |
1146 | kfree(sbi->s_group_desc); | |
1147 | kfree(sbi->s_debts); | |
1148 | failed_mount: | |
1149 | brelse(bh); | |
1150 | failed_sbi: | |
1151 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1152 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1153 | kfree(sbi); |
e124a320 | 1154 | failed: |
52fcf703 | 1155 | return ret; |
1da177e4 LT |
1156 | } |
1157 | ||
7bf0dc9b TT |
1158 | static void ext2_clear_super_error(struct super_block *sb) |
1159 | { | |
1160 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1161 | ||
1162 | if (buffer_write_io_error(sbh)) { | |
1163 | /* | |
1164 | * Oh, dear. A previous attempt to write the | |
1165 | * superblock failed. This could happen because the | |
1166 | * USB device was yanked out. Or it could happen to | |
1167 | * be a transient write error and maybe the block will | |
1168 | * be remapped. Nothing we can do but to retry the | |
1169 | * write and hope for the best. | |
1170 | */ | |
2b8120ef JB |
1171 | ext2_msg(sb, KERN_ERR, |
1172 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1173 | clear_buffer_write_io_error(sbh); |
1174 | set_buffer_uptodate(sbh); | |
1175 | } | |
1176 | } | |
1177 | ||
ee6921eb JB |
1178 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1179 | int wait) | |
1da177e4 | 1180 | { |
7bf0dc9b | 1181 | ext2_clear_super_error(sb); |
c15271f4 | 1182 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1183 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1184 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1185 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1186 | /* unlock before we do IO */ |
1187 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1188 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1189 | if (wait) |
1190 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | /* | |
1194 | * In the second extended file system, it is not necessary to | |
1195 | * write the super block since we use a mapping of the | |
1196 | * disk super block in a buffer. | |
1197 | * | |
1198 | * However, this function is still used to set the fs valid | |
1199 | * flags to 0. We need to set this flag to 0 since the fs | |
1200 | * may have been checked while mounted and e2fsck may have | |
1201 | * set s_state to EXT2_VALID_FS after some corrections. | |
1202 | */ | |
40f31dd4 | 1203 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1204 | { |
c15271f4 | 1205 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1206 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1207 | ||
a1177825 JK |
1208 | /* |
1209 | * Write quota structures to quota file, sync_blockdev() will write | |
1210 | * them to disk later | |
1211 | */ | |
1212 | dquot_writeback_dquots(sb, -1); | |
1213 | ||
c15271f4 | 1214 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1215 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1216 | ext2_debug("setting valid to 0\n"); | |
1217 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1218 | } |
c15271f4 | 1219 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1220 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1221 | return 0; |
1222 | } | |
1223 | ||
1e8b212f JK |
1224 | static int ext2_freeze(struct super_block *sb) |
1225 | { | |
1226 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1227 | ||
1228 | /* | |
1229 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1230 | * because we have unattached inodes and thus filesystem is not fully | |
1231 | * consistent. | |
1232 | */ | |
1233 | if (atomic_long_read(&sb->s_remove_count)) { | |
1234 | ext2_sync_fs(sb, 1); | |
1235 | return 0; | |
1236 | } | |
1237 | /* Set EXT2_FS_VALID flag */ | |
1238 | spin_lock(&sbi->s_lock); | |
1239 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1240 | spin_unlock(&sbi->s_lock); | |
1241 | ext2_sync_super(sb, sbi->s_es, 1); | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | static int ext2_unfreeze(struct super_block *sb) | |
1247 | { | |
1248 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1249 | ext2_write_super(sb); | |
1250 | ||
1251 | return 0; | |
1252 | } | |
40f31dd4 CH |
1253 | |
1254 | void ext2_write_super(struct super_block *sb) | |
1255 | { | |
1256 | if (!(sb->s_flags & MS_RDONLY)) | |
1257 | ext2_sync_fs(sb, 1); | |
1da177e4 LT |
1258 | } |
1259 | ||
1260 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1261 | { | |
1262 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1263 | struct ext2_super_block * es; | |
50a52234 JK |
1264 | struct ext2_mount_options old_opts; |
1265 | unsigned long old_sb_flags; | |
1266 | int err; | |
1267 | ||
02b9984d | 1268 | sync_filesystem(sb); |
c15271f4 | 1269 | spin_lock(&sbi->s_lock); |
337eb00a | 1270 | |
50a52234 JK |
1271 | /* Store the old options */ |
1272 | old_sb_flags = sb->s_flags; | |
1273 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1274 | old_opts.s_resuid = sbi->s_resuid; | |
1275 | old_opts.s_resgid = sbi->s_resgid; | |
1da177e4 LT |
1276 | |
1277 | /* | |
1278 | * Allow the "check" option to be passed as a remount option. | |
1279 | */ | |
2314b07c | 1280 | if (!parse_options(data, sb)) { |
50a52234 JK |
1281 | err = -EINVAL; |
1282 | goto restore_opts; | |
1283 | } | |
1da177e4 LT |
1284 | |
1285 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1286 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1287 | ||
1288 | es = sbi->s_es; | |
0de4830f | 1289 | if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_XIP) { |
2314b07c AF |
1290 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
1291 | "xip flag with busy inodes while remounting"); | |
0de4830f | 1292 | sbi->s_mount_opt ^= EXT2_MOUNT_XIP; |
0e4a9b59 | 1293 | } |
337eb00a | 1294 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
c15271f4 | 1295 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1296 | return 0; |
337eb00a | 1297 | } |
1da177e4 LT |
1298 | if (*flags & MS_RDONLY) { |
1299 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
337eb00a | 1300 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
c15271f4 | 1301 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1302 | return 0; |
337eb00a | 1303 | } |
c79d967d | 1304 | |
1da177e4 LT |
1305 | /* |
1306 | * OK, we are remounting a valid rw partition rdonly, so set | |
1307 | * the rdonly flag and then mark the partition as valid again. | |
1308 | */ | |
1309 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1310 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1311 | spin_unlock(&sbi->s_lock); |
c79d967d | 1312 | |
0f0dd62f CH |
1313 | err = dquot_suspend(sb, -1); |
1314 | if (err < 0) { | |
c79d967d CH |
1315 | spin_lock(&sbi->s_lock); |
1316 | goto restore_opts; | |
1317 | } | |
1318 | ||
4c96a68b | 1319 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1320 | } else { |
1321 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1322 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1323 | if (ret) { | |
2314b07c AF |
1324 | ext2_msg(sb, KERN_WARNING, |
1325 | "warning: couldn't remount RDWR because of " | |
1326 | "unsupported optional features (%x).", | |
1327 | le32_to_cpu(ret)); | |
50a52234 JK |
1328 | err = -EROFS; |
1329 | goto restore_opts; | |
1da177e4 LT |
1330 | } |
1331 | /* | |
1332 | * Mounting a RDONLY partition read-write, so reread and | |
1333 | * store the current valid flag. (It may have been changed | |
1334 | * by e2fsck since we originally mounted the partition.) | |
1335 | */ | |
1336 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1337 | if (!ext2_setup_super (sb, es, 0)) | |
1338 | sb->s_flags &= ~MS_RDONLY; | |
c15271f4 | 1339 | spin_unlock(&sbi->s_lock); |
c79d967d | 1340 | |
4c96a68b | 1341 | ext2_write_super(sb); |
c79d967d | 1342 | |
0f0dd62f | 1343 | dquot_resume(sb, -1); |
1da177e4 | 1344 | } |
c79d967d | 1345 | |
1da177e4 | 1346 | return 0; |
50a52234 JK |
1347 | restore_opts: |
1348 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1349 | sbi->s_resuid = old_opts.s_resuid; | |
1350 | sbi->s_resgid = old_opts.s_resgid; | |
1351 | sb->s_flags = old_sb_flags; | |
c15271f4 | 1352 | spin_unlock(&sbi->s_lock); |
50a52234 | 1353 | return err; |
1da177e4 LT |
1354 | } |
1355 | ||
726c3342 | 1356 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1357 | { |
726c3342 | 1358 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1359 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1360 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1361 | u64 fsid; |
1da177e4 | 1362 | |
c15271f4 JB |
1363 | spin_lock(&sbi->s_lock); |
1364 | ||
1da177e4 | 1365 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1366 | sbi->s_overhead_last = 0; |
1367 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1368 | unsigned long i, overhead = 0; | |
1369 | smp_rmb(); | |
1370 | ||
1da177e4 | 1371 | /* |
2235219b BP |
1372 | * Compute the overhead (FS structures). This is constant |
1373 | * for a given filesystem unless the number of block groups | |
1374 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1375 | */ |
1376 | ||
1377 | /* | |
1378 | * All of the blocks before first_data_block are | |
1379 | * overhead | |
1380 | */ | |
e4fca01e | 1381 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1382 | |
1383 | /* | |
1384 | * Add the overhead attributed to the superblock and | |
1385 | * block group descriptors. If the sparse superblocks | |
1386 | * feature is turned on, then not all groups have this. | |
1387 | */ | |
1388 | for (i = 0; i < sbi->s_groups_count; i++) | |
1389 | overhead += ext2_bg_has_super(sb, i) + | |
1390 | ext2_bg_num_gdb(sb, i); | |
1391 | ||
1392 | /* | |
1393 | * Every block group has an inode bitmap, a block | |
1394 | * bitmap, and an inode table. | |
1395 | */ | |
1396 | overhead += (sbi->s_groups_count * | |
1397 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1398 | sbi->s_overhead_last = overhead; |
1399 | smp_wmb(); | |
1400 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1401 | } |
1402 | ||
1403 | buf->f_type = EXT2_SUPER_MAGIC; | |
1404 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1405 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1406 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1407 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1408 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1409 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1410 | buf->f_bavail = 0; |
e4fca01e PE |
1411 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1412 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1413 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1414 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1415 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1416 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1417 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1418 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1419 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1420 | return 0; |
1421 | } | |
1422 | ||
152a0836 AV |
1423 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1424 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1425 | { |
152a0836 | 1426 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1427 | } |
1428 | ||
1429 | #ifdef CONFIG_QUOTA | |
1430 | ||
1431 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1432 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1433 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1434 | * we don't have to be afraid of races */ |
1435 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1436 | size_t len, loff_t off) | |
1437 | { | |
1438 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1439 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1440 | int err = 0; | |
1441 | int offset = off & (sb->s_blocksize - 1); | |
1442 | int tocopy; | |
1443 | size_t toread; | |
1444 | struct buffer_head tmp_bh; | |
1445 | struct buffer_head *bh; | |
1446 | loff_t i_size = i_size_read(inode); | |
1447 | ||
1448 | if (off > i_size) | |
1449 | return 0; | |
1450 | if (off+len > i_size) | |
1451 | len = i_size-off; | |
1452 | toread = len; | |
1453 | while (toread > 0) { | |
1454 | tocopy = sb->s_blocksize - offset < toread ? | |
1455 | sb->s_blocksize - offset : toread; | |
1456 | ||
1457 | tmp_bh.b_state = 0; | |
c16831b4 | 1458 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1459 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1460 | if (err < 0) |
1da177e4 LT |
1461 | return err; |
1462 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1463 | memset(data, 0, tocopy); | |
1464 | else { | |
1465 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1466 | if (!bh) | |
1467 | return -EIO; | |
1468 | memcpy(data, bh->b_data+offset, tocopy); | |
1469 | brelse(bh); | |
1470 | } | |
1471 | offset = 0; | |
1472 | toread -= tocopy; | |
1473 | data += tocopy; | |
1474 | blk++; | |
1475 | } | |
1476 | return len; | |
1477 | } | |
1478 | ||
1479 | /* Write to quotafile */ | |
1480 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1481 | const char *data, size_t len, loff_t off) | |
1482 | { | |
1483 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1484 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1485 | int err = 0; | |
1486 | int offset = off & (sb->s_blocksize - 1); | |
1487 | int tocopy; | |
1488 | size_t towrite = len; | |
1489 | struct buffer_head tmp_bh; | |
1490 | struct buffer_head *bh; | |
1491 | ||
1da177e4 LT |
1492 | while (towrite > 0) { |
1493 | tocopy = sb->s_blocksize - offset < towrite ? | |
1494 | sb->s_blocksize - offset : towrite; | |
1495 | ||
1496 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1497 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1498 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1499 | if (err < 0) |
1da177e4 LT |
1500 | goto out; |
1501 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1502 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1503 | else | |
1504 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1505 | if (unlikely(!bh)) { |
1da177e4 LT |
1506 | err = -EIO; |
1507 | goto out; | |
1508 | } | |
1509 | lock_buffer(bh); | |
1510 | memcpy(bh->b_data+offset, data, tocopy); | |
1511 | flush_dcache_page(bh->b_page); | |
1512 | set_buffer_uptodate(bh); | |
1513 | mark_buffer_dirty(bh); | |
1514 | unlock_buffer(bh); | |
1515 | brelse(bh); | |
1516 | offset = 0; | |
1517 | towrite -= tocopy; | |
1518 | data += tocopy; | |
1519 | blk++; | |
1520 | } | |
1521 | out: | |
e2a3fde7 | 1522 | if (len == towrite) |
1da177e4 LT |
1523 | return err; |
1524 | if (inode->i_size < off+len-towrite) | |
1525 | i_size_write(inode, off+len-towrite); | |
1526 | inode->i_version++; | |
1527 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1528 | mark_inode_dirty(inode); | |
1da177e4 LT |
1529 | return len - towrite; |
1530 | } | |
1531 | ||
1532 | #endif | |
1533 | ||
1534 | static struct file_system_type ext2_fs_type = { | |
1535 | .owner = THIS_MODULE, | |
1536 | .name = "ext2", | |
152a0836 | 1537 | .mount = ext2_mount, |
1da177e4 LT |
1538 | .kill_sb = kill_block_super, |
1539 | .fs_flags = FS_REQUIRES_DEV, | |
1540 | }; | |
7f78e035 | 1541 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1542 | |
1543 | static int __init init_ext2_fs(void) | |
1544 | { | |
1545 | int err = init_ext2_xattr(); | |
1546 | if (err) | |
1547 | return err; | |
1548 | err = init_inodecache(); | |
1549 | if (err) | |
1550 | goto out1; | |
1551 | err = register_filesystem(&ext2_fs_type); | |
1552 | if (err) | |
1553 | goto out; | |
1554 | return 0; | |
1555 | out: | |
1556 | destroy_inodecache(); | |
1557 | out1: | |
1558 | exit_ext2_xattr(); | |
1559 | return err; | |
1560 | } | |
1561 | ||
1562 | static void __exit exit_ext2_fs(void) | |
1563 | { | |
1564 | unregister_filesystem(&ext2_fs_type); | |
1565 | destroy_inodecache(); | |
1566 | exit_ext2_xattr(); | |
1567 | } | |
1568 | ||
302bf2f3 PG |
1569 | MODULE_AUTHOR("Remy Card and others"); |
1570 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1571 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1572 | module_init(init_ext2_fs) |
1573 | module_exit(exit_ext2_fs) |