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Commit | Line | Data |
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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" | |
6d79125b | 38 | #include "xip.h" |
1da177e4 LT |
39 | |
40 | static void ext2_sync_super(struct super_block *sb, | |
ee6921eb | 41 | struct ext2_super_block *es, int wait); |
1da177e4 | 42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 44 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1da177e4 | 45 | |
23a2ad6d JP |
46 | void ext2_error(struct super_block *sb, const char *function, |
47 | const char *fmt, ...) | |
1da177e4 | 48 | { |
23a2ad6d | 49 | struct va_format vaf; |
1da177e4 LT |
50 | va_list args; |
51 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
52 | struct ext2_super_block *es = sbi->s_es; | |
53 | ||
54 | if (!(sb->s_flags & MS_RDONLY)) { | |
c15271f4 | 55 | spin_lock(&sbi->s_lock); |
1da177e4 | 56 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 57 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 58 | spin_unlock(&sbi->s_lock); |
ee6921eb | 59 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
60 | } |
61 | ||
62 | va_start(args, fmt); | |
23a2ad6d JP |
63 | |
64 | vaf.fmt = fmt; | |
65 | vaf.va = &args; | |
66 | ||
67 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", | |
68 | sb->s_id, function, &vaf); | |
69 | ||
1da177e4 LT |
70 | va_end(args); |
71 | ||
72 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 73 | panic("EXT2-fs: panic from previous error\n"); |
1da177e4 | 74 | if (test_opt(sb, ERRORS_RO)) { |
2314b07c OR |
75 | ext2_msg(sb, KERN_CRIT, |
76 | "error: remounting filesystem read-only"); | |
1da177e4 LT |
77 | sb->s_flags |= MS_RDONLY; |
78 | } | |
79 | } | |
80 | ||
2314b07c OR |
81 | void ext2_msg(struct super_block *sb, const char *prefix, |
82 | const char *fmt, ...) | |
1da177e4 | 83 | { |
23a2ad6d | 84 | struct va_format vaf; |
1da177e4 LT |
85 | va_list args; |
86 | ||
87 | va_start(args, fmt); | |
23a2ad6d JP |
88 | |
89 | vaf.fmt = fmt; | |
90 | vaf.va = &args; | |
91 | ||
92 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); | |
93 | ||
1da177e4 LT |
94 | va_end(args); |
95 | } | |
96 | ||
c15271f4 JB |
97 | /* |
98 | * This must be called with sbi->s_lock held. | |
99 | */ | |
1da177e4 LT |
100 | void ext2_update_dynamic_rev(struct super_block *sb) |
101 | { | |
102 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
103 | ||
104 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
105 | return; | |
106 | ||
2314b07c OR |
107 | ext2_msg(sb, KERN_WARNING, |
108 | "warning: updating to rev %d because of " | |
109 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
110 | EXT2_DYNAMIC_REV); |
111 | ||
112 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
113 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
114 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
115 | /* leave es->s_feature_*compat flags alone */ | |
116 | /* es->s_uuid will be set by e2fsck if empty */ | |
117 | ||
118 | /* | |
119 | * The rest of the superblock fields should be zero, and if not it | |
120 | * means they are likely already in use, so leave them alone. We | |
121 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
122 | */ | |
123 | } | |
124 | ||
125 | static void ext2_put_super (struct super_block * sb) | |
126 | { | |
127 | int db_count; | |
128 | int i; | |
129 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
130 | ||
e0ccfd95 CH |
131 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
132 | ||
8c85e125 CH |
133 | if (sb->s_dirt) |
134 | ext2_write_super(sb); | |
135 | ||
1da177e4 LT |
136 | ext2_xattr_put_super(sb); |
137 | if (!(sb->s_flags & MS_RDONLY)) { | |
138 | struct ext2_super_block *es = sbi->s_es; | |
139 | ||
c15271f4 | 140 | spin_lock(&sbi->s_lock); |
1da177e4 | 141 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 142 | spin_unlock(&sbi->s_lock); |
ee6921eb | 143 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
144 | } |
145 | db_count = sbi->s_gdb_count; | |
146 | for (i = 0; i < db_count; i++) | |
147 | if (sbi->s_group_desc[i]) | |
148 | brelse (sbi->s_group_desc[i]); | |
149 | kfree(sbi->s_group_desc); | |
150 | kfree(sbi->s_debts); | |
151 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
152 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
153 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
154 | brelse (sbi->s_sbh); | |
155 | sb->s_fs_info = NULL; | |
18a82eb9 | 156 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 157 | kfree(sbi); |
1da177e4 LT |
158 | } |
159 | ||
e18b890b | 160 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
161 | |
162 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
163 | { | |
164 | struct ext2_inode_info *ei; | |
e94b1766 | 165 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
166 | if (!ei) |
167 | return NULL; | |
a686cd89 | 168 | ei->i_block_alloc_info = NULL; |
1da177e4 LT |
169 | ei->vfs_inode.i_version = 1; |
170 | return &ei->vfs_inode; | |
171 | } | |
172 | ||
fa0d7e3d | 173 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 174 | { |
fa0d7e3d NP |
175 | struct inode *inode = container_of(head, struct inode, i_rcu); |
176 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
177 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
178 | } | |
179 | ||
fa0d7e3d NP |
180 | static void ext2_destroy_inode(struct inode *inode) |
181 | { | |
182 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
183 | } | |
184 | ||
51cc5068 | 185 | static void init_once(void *foo) |
1da177e4 LT |
186 | { |
187 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
188 | ||
a35afb83 | 189 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 190 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 191 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 192 | #endif |
a686cd89 | 193 | mutex_init(&ei->truncate_mutex); |
a35afb83 | 194 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 195 | } |
20c2df83 | 196 | |
1da177e4 LT |
197 | static int init_inodecache(void) |
198 | { | |
199 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
200 | sizeof(struct ext2_inode_info), | |
fffb60f9 PJ |
201 | 0, (SLAB_RECLAIM_ACCOUNT| |
202 | SLAB_MEM_SPREAD), | |
20c2df83 | 203 | init_once); |
1da177e4 LT |
204 | if (ext2_inode_cachep == NULL) |
205 | return -ENOMEM; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static void destroy_inodecache(void) | |
210 | { | |
1a1d92c1 | 211 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
212 | } |
213 | ||
8fc2751b MB |
214 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) |
215 | { | |
93d44cb2 MS |
216 | struct super_block *sb = vfs->mnt_sb; |
217 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
218 | struct ext2_super_block *es = sbi->s_es; | |
219 | unsigned long def_mount_opts; | |
8fc2751b | 220 | |
c15271f4 | 221 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
222 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
223 | ||
224 | if (sbi->s_sb_block != 1) | |
225 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
226 | if (test_opt(sb, MINIX_DF)) | |
227 | seq_puts(seq, ",minixdf"); | |
228 | if (test_opt(sb, GRPID)) | |
8fc2751b | 229 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
230 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
231 | seq_puts(seq, ",nogrpid"); | |
232 | if (sbi->s_resuid != EXT2_DEF_RESUID || | |
233 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { | |
234 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
235 | } | |
236 | if (sbi->s_resgid != EXT2_DEF_RESGID || | |
237 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { | |
238 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
239 | } | |
14e11e10 | 240 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
241 | int def_errors = le16_to_cpu(es->s_errors); |
242 | ||
243 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
244 | def_errors == EXT2_ERRORS_CONTINUE) { |
245 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
246 | } |
247 | } | |
14e11e10 AK |
248 | if (test_opt(sb, ERRORS_CONT)) |
249 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
250 | if (test_opt(sb, ERRORS_PANIC)) |
251 | seq_puts(seq, ",errors=panic"); | |
252 | if (test_opt(sb, NO_UID32)) | |
253 | seq_puts(seq, ",nouid32"); | |
254 | if (test_opt(sb, DEBUG)) | |
255 | seq_puts(seq, ",debug"); | |
256 | if (test_opt(sb, OLDALLOC)) | |
257 | seq_puts(seq, ",oldalloc"); | |
258 | ||
259 | #ifdef CONFIG_EXT2_FS_XATTR | |
260 | if (test_opt(sb, XATTR_USER)) | |
261 | seq_puts(seq, ",user_xattr"); | |
262 | if (!test_opt(sb, XATTR_USER) && | |
263 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
264 | seq_puts(seq, ",nouser_xattr"); | |
265 | } | |
266 | #endif | |
267 | ||
268 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
269 | if (test_opt(sb, POSIX_ACL)) | |
270 | seq_puts(seq, ",acl"); | |
271 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
272 | seq_puts(seq, ",noacl"); | |
273 | #endif | |
274 | ||
275 | if (test_opt(sb, NOBH)) | |
276 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
277 | |
278 | #if defined(CONFIG_QUOTA) | |
279 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
280 | seq_puts(seq, ",usrquota"); | |
281 | ||
282 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
283 | seq_puts(seq, ",grpquota"); | |
284 | #endif | |
285 | ||
83541796 CO |
286 | #if defined(CONFIG_EXT2_FS_XIP) |
287 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) | |
288 | seq_puts(seq, ",xip"); | |
289 | #endif | |
290 | ||
35c879dc MS |
291 | if (!test_opt(sb, RESERVATION)) |
292 | seq_puts(seq, ",noreservation"); | |
293 | ||
c15271f4 | 294 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
295 | return 0; |
296 | } | |
297 | ||
1da177e4 LT |
298 | #ifdef CONFIG_QUOTA |
299 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
300 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
301 | #endif | |
302 | ||
ee9b6d61 | 303 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
304 | .alloc_inode = ext2_alloc_inode, |
305 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 306 | .write_inode = ext2_write_inode, |
72edc4d0 | 307 | .evict_inode = ext2_evict_inode, |
1da177e4 LT |
308 | .put_super = ext2_put_super, |
309 | .write_super = ext2_write_super, | |
40f31dd4 | 310 | .sync_fs = ext2_sync_fs, |
1da177e4 LT |
311 | .statfs = ext2_statfs, |
312 | .remount_fs = ext2_remount, | |
8fc2751b | 313 | .show_options = ext2_show_options, |
1da177e4 LT |
314 | #ifdef CONFIG_QUOTA |
315 | .quota_read = ext2_quota_read, | |
316 | .quota_write = ext2_quota_write, | |
317 | #endif | |
318 | }; | |
319 | ||
2e4c68e3 CH |
320 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
321 | u64 ino, u32 generation) | |
ecaff756 | 322 | { |
ecaff756 | 323 | struct inode *inode; |
ecaff756 N |
324 | |
325 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
326 | return ERR_PTR(-ESTALE); | |
327 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
328 | return ERR_PTR(-ESTALE); | |
329 | ||
330 | /* iget isn't really right if the inode is currently unallocated!! | |
331 | * ext2_read_inode currently does appropriate checks, but | |
332 | * it might be "neater" to call ext2_get_inode first and check | |
333 | * if the inode is valid..... | |
334 | */ | |
52fcf703 DH |
335 | inode = ext2_iget(sb, ino); |
336 | if (IS_ERR(inode)) | |
337 | return ERR_CAST(inode); | |
338 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
339 | /* we didn't find the right inode.. */ |
340 | iput(inode); | |
341 | return ERR_PTR(-ESTALE); | |
342 | } | |
2e4c68e3 CH |
343 | return inode; |
344 | } | |
345 | ||
346 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
347 | int fh_len, int fh_type) | |
348 | { | |
349 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
350 | ext2_nfs_get_inode); | |
351 | } | |
352 | ||
353 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
354 | int fh_len, int fh_type) | |
355 | { | |
356 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
357 | ext2_nfs_get_inode); | |
ecaff756 N |
358 | } |
359 | ||
1da177e4 LT |
360 | /* Yes, most of these are left as NULL!! |
361 | * A NULL value implies the default, which works with ext2-like file | |
362 | * systems, but can be improved upon. | |
363 | * Currently only get_parent is required. | |
364 | */ | |
39655164 | 365 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
366 | .fh_to_dentry = ext2_fh_to_dentry, |
367 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
368 | .get_parent = ext2_get_parent, |
369 | }; | |
370 | ||
371 | static unsigned long get_sb_block(void **data) | |
372 | { | |
373 | unsigned long sb_block; | |
374 | char *options = (char *) *data; | |
375 | ||
376 | if (!options || strncmp(options, "sb=", 3) != 0) | |
377 | return 1; /* Default location */ | |
378 | options += 3; | |
379 | sb_block = simple_strtoul(options, &options, 0); | |
380 | if (*options && *options != ',') { | |
381 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
382 | (char *) *data); | |
383 | return 1; | |
384 | } | |
385 | if (*options == ',') | |
386 | options++; | |
387 | *data = (void *) options; | |
388 | return sb_block; | |
389 | } | |
390 | ||
391 | enum { | |
392 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 393 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 394 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b MB |
395 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
396 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, | |
a686cd89 | 397 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
398 | }; |
399 | ||
a447c093 | 400 | static const match_table_t tokens = { |
1da177e4 LT |
401 | {Opt_bsd_df, "bsddf"}, |
402 | {Opt_minix_df, "minixdf"}, | |
403 | {Opt_grpid, "grpid"}, | |
404 | {Opt_grpid, "bsdgroups"}, | |
405 | {Opt_nogrpid, "nogrpid"}, | |
406 | {Opt_nogrpid, "sysvgroups"}, | |
407 | {Opt_resgid, "resgid=%u"}, | |
408 | {Opt_resuid, "resuid=%u"}, | |
409 | {Opt_sb, "sb=%u"}, | |
410 | {Opt_err_cont, "errors=continue"}, | |
411 | {Opt_err_panic, "errors=panic"}, | |
412 | {Opt_err_ro, "errors=remount-ro"}, | |
413 | {Opt_nouid32, "nouid32"}, | |
414 | {Opt_nocheck, "check=none"}, | |
415 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
416 | {Opt_debug, "debug"}, |
417 | {Opt_oldalloc, "oldalloc"}, | |
418 | {Opt_orlov, "orlov"}, | |
419 | {Opt_nobh, "nobh"}, | |
420 | {Opt_user_xattr, "user_xattr"}, | |
421 | {Opt_nouser_xattr, "nouser_xattr"}, | |
422 | {Opt_acl, "acl"}, | |
423 | {Opt_noacl, "noacl"}, | |
6d79125b | 424 | {Opt_xip, "xip"}, |
8fc2751b | 425 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 426 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
427 | {Opt_quota, "quota"}, |
428 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
429 | {Opt_reservation, "reservation"}, |
430 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
431 | {Opt_err, NULL} |
432 | }; | |
433 | ||
2314b07c | 434 | static int parse_options(char *options, struct super_block *sb) |
1da177e4 | 435 | { |
2314b07c OR |
436 | char *p; |
437 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1da177e4 | 438 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 LT |
439 | int option; |
440 | ||
441 | if (!options) | |
442 | return 1; | |
443 | ||
444 | while ((p = strsep (&options, ",")) != NULL) { | |
445 | int token; | |
446 | if (!*p) | |
447 | continue; | |
448 | ||
449 | token = match_token(p, tokens, args); | |
450 | switch (token) { | |
451 | case Opt_bsd_df: | |
452 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
453 | break; | |
454 | case Opt_minix_df: | |
455 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
456 | break; | |
457 | case Opt_grpid: | |
458 | set_opt (sbi->s_mount_opt, GRPID); | |
459 | break; | |
460 | case Opt_nogrpid: | |
461 | clear_opt (sbi->s_mount_opt, GRPID); | |
462 | break; | |
463 | case Opt_resuid: | |
464 | if (match_int(&args[0], &option)) | |
465 | return 0; | |
466 | sbi->s_resuid = option; | |
467 | break; | |
468 | case Opt_resgid: | |
469 | if (match_int(&args[0], &option)) | |
470 | return 0; | |
471 | sbi->s_resgid = option; | |
472 | break; | |
473 | case Opt_sb: | |
474 | /* handled by get_sb_block() instead of here */ | |
475 | /* *sb_block = match_int(&args[0]); */ | |
476 | break; | |
477 | case Opt_err_panic: | |
5a2b4062 VA |
478 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
479 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
480 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
481 | break; |
482 | case Opt_err_ro: | |
5a2b4062 VA |
483 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
484 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
485 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
486 | break; |
487 | case Opt_err_cont: | |
5a2b4062 VA |
488 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
489 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
490 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
491 | break; |
492 | case Opt_nouid32: | |
493 | set_opt (sbi->s_mount_opt, NO_UID32); | |
494 | break; | |
1da177e4 LT |
495 | case Opt_nocheck: |
496 | clear_opt (sbi->s_mount_opt, CHECK); | |
497 | break; | |
498 | case Opt_debug: | |
499 | set_opt (sbi->s_mount_opt, DEBUG); | |
500 | break; | |
501 | case Opt_oldalloc: | |
502 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
503 | break; | |
504 | case Opt_orlov: | |
505 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
506 | break; | |
507 | case Opt_nobh: | |
508 | set_opt (sbi->s_mount_opt, NOBH); | |
509 | break; | |
510 | #ifdef CONFIG_EXT2_FS_XATTR | |
511 | case Opt_user_xattr: | |
512 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
513 | break; | |
514 | case Opt_nouser_xattr: | |
515 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
516 | break; | |
517 | #else | |
518 | case Opt_user_xattr: | |
519 | case Opt_nouser_xattr: | |
2314b07c OR |
520 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
521 | "not supported"); | |
1da177e4 LT |
522 | break; |
523 | #endif | |
524 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
525 | case Opt_acl: | |
526 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
527 | break; | |
528 | case Opt_noacl: | |
529 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
530 | break; | |
531 | #else | |
532 | case Opt_acl: | |
533 | case Opt_noacl: | |
2314b07c OR |
534 | ext2_msg(sb, KERN_INFO, |
535 | "(no)acl options not supported"); | |
1da177e4 LT |
536 | break; |
537 | #endif | |
6d79125b CO |
538 | case Opt_xip: |
539 | #ifdef CONFIG_EXT2_FS_XIP | |
540 | set_opt (sbi->s_mount_opt, XIP); | |
541 | #else | |
2314b07c | 542 | ext2_msg(sb, KERN_INFO, "xip option not supported"); |
6d79125b CO |
543 | #endif |
544 | break; | |
8fc2751b MB |
545 | |
546 | #if defined(CONFIG_QUOTA) | |
547 | case Opt_quota: | |
548 | case Opt_usrquota: | |
549 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
550 | break; | |
551 | ||
552 | case Opt_grpquota: | |
553 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
554 | break; | |
555 | #else | |
556 | case Opt_quota: | |
557 | case Opt_usrquota: | |
558 | case Opt_grpquota: | |
2314b07c OR |
559 | ext2_msg(sb, KERN_INFO, |
560 | "quota operations not supported"); | |
8fc2751b MB |
561 | break; |
562 | #endif | |
563 | ||
a686cd89 MB |
564 | case Opt_reservation: |
565 | set_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 566 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
567 | break; |
568 | case Opt_noreservation: | |
569 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 570 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 571 | break; |
1da177e4 LT |
572 | case Opt_ignore: |
573 | break; | |
574 | default: | |
575 | return 0; | |
576 | } | |
577 | } | |
1da177e4 LT |
578 | return 1; |
579 | } | |
580 | ||
581 | static int ext2_setup_super (struct super_block * sb, | |
582 | struct ext2_super_block * es, | |
583 | int read_only) | |
584 | { | |
585 | int res = 0; | |
586 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
587 | ||
588 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c OR |
589 | ext2_msg(sb, KERN_ERR, |
590 | "error: revision level too high, " | |
591 | "forcing read-only mode"); | |
1da177e4 LT |
592 | res = MS_RDONLY; |
593 | } | |
594 | if (read_only) | |
595 | return res; | |
596 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c OR |
597 | ext2_msg(sb, KERN_WARNING, |
598 | "warning: mounting unchecked fs, " | |
599 | "running e2fsck is recommended"); | |
1da177e4 | 600 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c OR |
601 | ext2_msg(sb, KERN_WARNING, |
602 | "warning: mounting fs with errors, " | |
603 | "running e2fsck is recommended"); | |
1da177e4 LT |
604 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
605 | le16_to_cpu(es->s_mnt_count) >= | |
606 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c OR |
607 | ext2_msg(sb, KERN_WARNING, |
608 | "warning: maximal mount count reached, " | |
609 | "running e2fsck is recommended"); | |
1da177e4 | 610 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c OR |
611 | (le32_to_cpu(es->s_lastcheck) + |
612 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
613 | ext2_msg(sb, KERN_WARNING, | |
614 | "warning: checktime reached, " | |
615 | "running e2fsck is recommended"); | |
1da177e4 LT |
616 | if (!le16_to_cpu(es->s_max_mnt_count)) |
617 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 618 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 619 | if (test_opt (sb, DEBUG)) |
2314b07c OR |
620 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
621 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
622 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
623 | sbi->s_frag_size, | |
624 | sbi->s_groups_count, | |
625 | EXT2_BLOCKS_PER_GROUP(sb), | |
626 | EXT2_INODES_PER_GROUP(sb), | |
627 | sbi->s_mount_opt); | |
1da177e4 LT |
628 | return res; |
629 | } | |
630 | ||
197cd65a | 631 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
632 | { |
633 | int i; | |
1da177e4 | 634 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
635 | |
636 | ext2_debug ("Checking group descriptors"); | |
637 | ||
197cd65a AM |
638 | for (i = 0; i < sbi->s_groups_count; i++) { |
639 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
640 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
641 | ext2_fsblk_t last_block; | |
197cd65a | 642 | |
41f04d85 ES |
643 | if (i == sbi->s_groups_count - 1) |
644 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
645 | else | |
646 | last_block = first_block + | |
647 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
648 | ||
41f04d85 ES |
649 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
650 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
651 | { |
652 | ext2_error (sb, "ext2_check_descriptors", | |
653 | "Block bitmap for group %d" | |
654 | " not in group (block %lu)!", | |
655 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
656 | return 0; | |
657 | } | |
41f04d85 ES |
658 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
659 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
660 | { |
661 | ext2_error (sb, "ext2_check_descriptors", | |
662 | "Inode bitmap for group %d" | |
663 | " not in group (block %lu)!", | |
664 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
665 | return 0; | |
666 | } | |
41f04d85 | 667 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 668 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 669 | last_block) |
1da177e4 LT |
670 | { |
671 | ext2_error (sb, "ext2_check_descriptors", | |
672 | "Inode table for group %d" | |
673 | " not in group (block %lu)!", | |
674 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
675 | return 0; | |
676 | } | |
1da177e4 LT |
677 | } |
678 | return 1; | |
679 | } | |
680 | ||
1da177e4 LT |
681 | /* |
682 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
683 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
684 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
685 | */ | |
686 | static loff_t ext2_max_size(int bits) | |
687 | { | |
688 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
689 | int meta_blocks; |
690 | loff_t upper_limit; | |
691 | ||
692 | /* This is calculated to be the largest file size for a | |
693 | * dense, file such that the total number of | |
1da177e4 | 694 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
695 | * does not exceed 2^32 -1 |
696 | * __u32 i_blocks representing the total number of | |
697 | * 512 bytes blocks of the file | |
698 | */ | |
699 | upper_limit = (1LL << 32) - 1; | |
700 | ||
701 | /* total blocks in file system block size */ | |
702 | upper_limit >>= (bits - 9); | |
703 | ||
704 | ||
705 | /* indirect blocks */ | |
706 | meta_blocks = 1; | |
707 | /* double indirect blocks */ | |
708 | meta_blocks += 1 + (1LL << (bits-2)); | |
709 | /* tripple indirect blocks */ | |
710 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
711 | ||
712 | upper_limit -= meta_blocks; | |
713 | upper_limit <<= bits; | |
1da177e4 LT |
714 | |
715 | res += 1LL << (bits-2); | |
716 | res += 1LL << (2*(bits-2)); | |
717 | res += 1LL << (3*(bits-2)); | |
718 | res <<= bits; | |
719 | if (res > upper_limit) | |
720 | res = upper_limit; | |
902be4c5 AK |
721 | |
722 | if (res > MAX_LFS_FILESIZE) | |
723 | res = MAX_LFS_FILESIZE; | |
724 | ||
1da177e4 LT |
725 | return res; |
726 | } | |
727 | ||
728 | static unsigned long descriptor_loc(struct super_block *sb, | |
729 | unsigned long logic_sb_block, | |
730 | int nr) | |
731 | { | |
732 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 733 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
734 | int has_super = 0; |
735 | ||
1da177e4 LT |
736 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
737 | ||
738 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
739 | nr < first_meta_bg) | |
740 | return (logic_sb_block + nr + 1); | |
741 | bg = sbi->s_desc_per_block * nr; | |
742 | if (ext2_bg_has_super(sb, bg)) | |
743 | has_super = 1; | |
24097d12 AM |
744 | |
745 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
746 | } |
747 | ||
748 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
749 | { | |
750 | struct buffer_head * bh; | |
751 | struct ext2_sb_info * sbi; | |
752 | struct ext2_super_block * es; | |
753 | struct inode *root; | |
754 | unsigned long block; | |
755 | unsigned long sb_block = get_sb_block(&data); | |
756 | unsigned long logic_sb_block; | |
757 | unsigned long offset = 0; | |
758 | unsigned long def_mount_opts; | |
52fcf703 | 759 | long ret = -EINVAL; |
1da177e4 LT |
760 | int blocksize = BLOCK_SIZE; |
761 | int db_count; | |
762 | int i, j; | |
763 | __le32 features; | |
833f4077 | 764 | int err; |
1da177e4 | 765 | |
db719222 | 766 | err = -ENOMEM; |
f8314dc6 | 767 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 768 | if (!sbi) |
db719222 | 769 | goto failed_unlock; |
18a82eb9 PE |
770 | |
771 | sbi->s_blockgroup_lock = | |
772 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
773 | if (!sbi->s_blockgroup_lock) { | |
774 | kfree(sbi); | |
db719222 | 775 | goto failed_unlock; |
18a82eb9 | 776 | } |
1da177e4 | 777 | sb->s_fs_info = sbi; |
93d44cb2 | 778 | sbi->s_sb_block = sb_block; |
1da177e4 | 779 | |
c15271f4 JB |
780 | spin_lock_init(&sbi->s_lock); |
781 | ||
1da177e4 LT |
782 | /* |
783 | * See what the current blocksize for the device is, and | |
784 | * use that as the blocksize. Otherwise (or if the blocksize | |
785 | * is smaller than the default) use the default. | |
786 | * This is important for devices that have a hardware | |
787 | * sectorsize that is larger than the default. | |
788 | */ | |
789 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
790 | if (!blocksize) { | |
2314b07c | 791 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
792 | goto failed_sbi; |
793 | } | |
794 | ||
795 | /* | |
796 | * If the superblock doesn't start on a hardware sector boundary, | |
797 | * calculate the offset. | |
798 | */ | |
799 | if (blocksize != BLOCK_SIZE) { | |
800 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
801 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
802 | } else { | |
803 | logic_sb_block = sb_block; | |
804 | } | |
805 | ||
806 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 807 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
808 | goto failed_sbi; |
809 | } | |
810 | /* | |
811 | * Note: s_es must be initialized as soon as possible because | |
812 | * some ext2 macro-instructions depend on its value | |
813 | */ | |
814 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
815 | sbi->s_es = es; | |
816 | sb->s_magic = le16_to_cpu(es->s_magic); | |
817 | ||
818 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
819 | goto cantfind_ext2; | |
820 | ||
821 | /* Set defaults before we parse the mount options */ | |
822 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
823 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
824 | set_opt(sbi->s_mount_opt, DEBUG); | |
825 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
826 | set_opt(sbi->s_mount_opt, GRPID); | |
827 | if (def_mount_opts & EXT2_DEFM_UID16) | |
828 | set_opt(sbi->s_mount_opt, NO_UID32); | |
2e7842b8 | 829 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 LT |
830 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
831 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
2e7842b8 HD |
832 | #endif |
833 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 LT |
834 | if (def_mount_opts & EXT2_DEFM_ACL) |
835 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
2e7842b8 | 836 | #endif |
1da177e4 LT |
837 | |
838 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
839 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
14e11e10 | 840 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
5a2b4062 | 841 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
14e11e10 AK |
842 | else |
843 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
844 | |
845 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
846 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
847 | ||
a686cd89 MB |
848 | set_opt(sbi->s_mount_opt, RESERVATION); |
849 | ||
2314b07c | 850 | if (!parse_options((char *) data, sb)) |
1da177e4 LT |
851 | goto failed_mount; |
852 | ||
853 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
854 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
855 | MS_POSIXACL : 0); | |
856 | ||
6d79125b CO |
857 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
858 | EXT2_MOUNT_XIP if not */ | |
859 | ||
1da177e4 LT |
860 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
861 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
862 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
863 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c OR |
864 | ext2_msg(sb, KERN_WARNING, |
865 | "warning: feature flags set on rev 0 fs, " | |
866 | "running e2fsck is recommended"); | |
1da177e4 LT |
867 | /* |
868 | * Check feature flags regardless of the revision level, since we | |
869 | * previously didn't change the revision level when setting the flags, | |
870 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
871 | */ | |
872 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
873 | if (features) { | |
2314b07c OR |
874 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
875 | "unsupported optional features (%x)", | |
876 | le32_to_cpu(features)); | |
1da177e4 LT |
877 | goto failed_mount; |
878 | } | |
879 | if (!(sb->s_flags & MS_RDONLY) && | |
880 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
2314b07c OR |
881 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
882 | "unsupported optional features (%x)", | |
883 | le32_to_cpu(features)); | |
1da177e4 LT |
884 | goto failed_mount; |
885 | } | |
886 | ||
887 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
888 | ||
a8e3eff4 | 889 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { |
6d79125b | 890 | if (!silent) |
2314b07c OR |
891 | ext2_msg(sb, KERN_ERR, |
892 | "error: unsupported blocksize for xip"); | |
6d79125b CO |
893 | goto failed_mount; |
894 | } | |
895 | ||
1da177e4 LT |
896 | /* If the blocksize doesn't match, re-read the thing.. */ |
897 | if (sb->s_blocksize != blocksize) { | |
898 | brelse(bh); | |
899 | ||
900 | if (!sb_set_blocksize(sb, blocksize)) { | |
2314b07c | 901 | ext2_msg(sb, KERN_ERR, "error: blocksize is too small"); |
1da177e4 LT |
902 | goto failed_sbi; |
903 | } | |
904 | ||
905 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
906 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
907 | bh = sb_bread(sb, logic_sb_block); | |
908 | if(!bh) { | |
2314b07c OR |
909 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
910 | "superblock on 2nd try"); | |
1da177e4 LT |
911 | goto failed_sbi; |
912 | } | |
913 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
914 | sbi->s_es = es; | |
915 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 916 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
917 | goto failed_mount; |
918 | } | |
919 | } | |
920 | ||
921 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
922 | ||
923 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
924 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
925 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
926 | } else { | |
927 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
928 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
929 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 930 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 931 | (sbi->s_inode_size > blocksize)) { |
2314b07c OR |
932 | ext2_msg(sb, KERN_ERR, |
933 | "error: unsupported inode size: %d", | |
1da177e4 LT |
934 | sbi->s_inode_size); |
935 | goto failed_mount; | |
936 | } | |
937 | } | |
938 | ||
939 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
940 | le32_to_cpu(es->s_log_frag_size); | |
941 | if (sbi->s_frag_size == 0) | |
942 | goto cantfind_ext2; | |
943 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
944 | ||
945 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
946 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
947 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
948 | ||
949 | if (EXT2_INODE_SIZE(sb) == 0) | |
950 | goto cantfind_ext2; | |
951 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 952 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
953 | goto cantfind_ext2; |
954 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
955 | sbi->s_inodes_per_block; | |
956 | sbi->s_desc_per_block = sb->s_blocksize / | |
957 | sizeof (struct ext2_group_desc); | |
958 | sbi->s_sbh = bh; | |
959 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
960 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 961 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 962 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 963 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
964 | |
965 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
966 | goto cantfind_ext2; | |
967 | ||
968 | if (sb->s_blocksize != bh->b_size) { | |
969 | if (!silent) | |
2314b07c | 970 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
971 | goto failed_mount; |
972 | } | |
973 | ||
974 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c OR |
975 | ext2_msg(sb, KERN_ERR, |
976 | "error: fragsize %lu != blocksize %lu" | |
977 | "(not supported yet)", | |
1da177e4 LT |
978 | sbi->s_frag_size, sb->s_blocksize); |
979 | goto failed_mount; | |
980 | } | |
981 | ||
982 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
983 | ext2_msg(sb, KERN_ERR, |
984 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
985 | sbi->s_blocks_per_group); |
986 | goto failed_mount; | |
987 | } | |
988 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
989 | ext2_msg(sb, KERN_ERR, |
990 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
991 | sbi->s_frags_per_group); |
992 | goto failed_mount; | |
993 | } | |
994 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
995 | ext2_msg(sb, KERN_ERR, |
996 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
997 | sbi->s_inodes_per_group); |
998 | goto failed_mount; | |
999 | } | |
1000 | ||
1001 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1002 | goto cantfind_ext2; | |
41f04d85 ES |
1003 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1004 | le32_to_cpu(es->s_first_data_block) - 1) | |
1005 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1006 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1007 | EXT2_DESC_PER_BLOCK(sb); | |
1008 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1009 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1010 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1011 | goto failed_mount; |
1012 | } | |
18a82eb9 | 1013 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1014 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1015 | if (!sbi->s_debts) { |
2314b07c | 1016 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1017 | goto failed_mount_group_desc; |
1018 | } | |
1da177e4 LT |
1019 | for (i = 0; i < db_count; i++) { |
1020 | block = descriptor_loc(sb, logic_sb_block, i); | |
1021 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1022 | if (!sbi->s_group_desc[i]) { | |
1023 | for (j = 0; j < i; j++) | |
1024 | brelse (sbi->s_group_desc[j]); | |
2314b07c OR |
1025 | ext2_msg(sb, KERN_ERR, |
1026 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1027 | goto failed_mount_group_desc; |
1028 | } | |
1029 | } | |
1030 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1031 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1032 | goto failed_mount2; |
1033 | } | |
1034 | sbi->s_gdb_count = db_count; | |
1035 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1036 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1037 | |
a686cd89 MB |
1038 | /* per fileystem reservation list head & lock */ |
1039 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1040 | sbi->s_rsv_window_root = RB_ROOT; | |
1041 | /* | |
1042 | * Add a single, static dummy reservation to the start of the | |
1043 | * reservation window list --- it gives us a placeholder for | |
1044 | * append-at-start-of-list which makes the allocation logic | |
1045 | * _much_ simpler. | |
1046 | */ | |
1047 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1048 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1049 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1050 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1051 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1052 | ||
833f4077 | 1053 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
0216bfcf | 1054 | ext2_count_free_blocks(sb)); |
833f4077 PZ |
1055 | if (!err) { |
1056 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
0216bfcf | 1057 | ext2_count_free_inodes(sb)); |
833f4077 PZ |
1058 | } |
1059 | if (!err) { | |
1060 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
0216bfcf | 1061 | ext2_count_dirs(sb)); |
833f4077 PZ |
1062 | } |
1063 | if (err) { | |
2314b07c | 1064 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1065 | goto failed_mount3; |
1066 | } | |
1da177e4 LT |
1067 | /* |
1068 | * set up enough so that it can read an inode | |
1069 | */ | |
1070 | sb->s_op = &ext2_sops; | |
1071 | sb->s_export_op = &ext2_export_ops; | |
1072 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1073 | |
1074 | #ifdef CONFIG_QUOTA | |
1075 | sb->dq_op = &dquot_operations; | |
287a8095 | 1076 | sb->s_qcop = &dquot_quotactl_ops; |
123e9caf CH |
1077 | #endif |
1078 | ||
52fcf703 DH |
1079 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1080 | if (IS_ERR(root)) { | |
1081 | ret = PTR_ERR(root); | |
0216bfcf | 1082 | goto failed_mount3; |
1da177e4 LT |
1083 | } |
1084 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1085 | iput(root); |
2314b07c | 1086 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1087 | goto failed_mount3; |
1da177e4 | 1088 | } |
52fcf703 DH |
1089 | |
1090 | sb->s_root = d_alloc_root(root); | |
1091 | if (!sb->s_root) { | |
1092 | iput(root); | |
2314b07c | 1093 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1094 | ret = -ENOMEM; |
1095 | goto failed_mount3; | |
1096 | } | |
1da177e4 | 1097 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c OR |
1098 | ext2_msg(sb, KERN_WARNING, |
1099 | "warning: mounting ext3 filesystem as ext2"); | |
4c96a68b JB |
1100 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
1101 | sb->s_flags |= MS_RDONLY; | |
1102 | ext2_write_super(sb); | |
1da177e4 LT |
1103 | return 0; |
1104 | ||
1105 | cantfind_ext2: | |
1106 | if (!silent) | |
2314b07c OR |
1107 | ext2_msg(sb, KERN_ERR, |
1108 | "error: can't find an ext2 filesystem on dev %s.", | |
1109 | sb->s_id); | |
1da177e4 | 1110 | goto failed_mount; |
0216bfcf MC |
1111 | failed_mount3: |
1112 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1113 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1114 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1115 | failed_mount2: |
1116 | for (i = 0; i < db_count; i++) | |
1117 | brelse(sbi->s_group_desc[i]); | |
1118 | failed_mount_group_desc: | |
1119 | kfree(sbi->s_group_desc); | |
1120 | kfree(sbi->s_debts); | |
1121 | failed_mount: | |
1122 | brelse(bh); | |
1123 | failed_sbi: | |
1124 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1125 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1126 | kfree(sbi); |
db719222 | 1127 | failed_unlock: |
52fcf703 | 1128 | return ret; |
1da177e4 LT |
1129 | } |
1130 | ||
7bf0dc9b TT |
1131 | static void ext2_clear_super_error(struct super_block *sb) |
1132 | { | |
1133 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1134 | ||
1135 | if (buffer_write_io_error(sbh)) { | |
1136 | /* | |
1137 | * Oh, dear. A previous attempt to write the | |
1138 | * superblock failed. This could happen because the | |
1139 | * USB device was yanked out. Or it could happen to | |
1140 | * be a transient write error and maybe the block will | |
1141 | * be remapped. Nothing we can do but to retry the | |
1142 | * write and hope for the best. | |
1143 | */ | |
2b8120ef JB |
1144 | ext2_msg(sb, KERN_ERR, |
1145 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1146 | clear_buffer_write_io_error(sbh); |
1147 | set_buffer_uptodate(sbh); | |
1148 | } | |
1149 | } | |
1150 | ||
ee6921eb JB |
1151 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1152 | int wait) | |
1da177e4 | 1153 | { |
7bf0dc9b | 1154 | ext2_clear_super_error(sb); |
c15271f4 | 1155 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1156 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1157 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1158 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1159 | /* unlock before we do IO */ |
1160 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1161 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1162 | if (wait) |
1163 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1164 | sb->s_dirt = 0; |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * In the second extended file system, it is not necessary to | |
1169 | * write the super block since we use a mapping of the | |
1170 | * disk super block in a buffer. | |
1171 | * | |
1172 | * However, this function is still used to set the fs valid | |
1173 | * flags to 0. We need to set this flag to 0 since the fs | |
1174 | * may have been checked while mounted and e2fsck may have | |
1175 | * set s_state to EXT2_VALID_FS after some corrections. | |
1176 | */ | |
40f31dd4 | 1177 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1178 | { |
c15271f4 | 1179 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1180 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1181 | ||
c15271f4 | 1182 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1183 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1184 | ext2_debug("setting valid to 0\n"); | |
1185 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1186 | } |
c15271f4 | 1187 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1188 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1189 | return 0; |
1190 | } | |
1191 | ||
1192 | ||
1193 | void ext2_write_super(struct super_block *sb) | |
1194 | { | |
1195 | if (!(sb->s_flags & MS_RDONLY)) | |
1196 | ext2_sync_fs(sb, 1); | |
1197 | else | |
1198 | sb->s_dirt = 0; | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1202 | { | |
1203 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1204 | struct ext2_super_block * es; | |
6d79125b | 1205 | unsigned long old_mount_opt = sbi->s_mount_opt; |
50a52234 JK |
1206 | struct ext2_mount_options old_opts; |
1207 | unsigned long old_sb_flags; | |
1208 | int err; | |
1209 | ||
c15271f4 | 1210 | spin_lock(&sbi->s_lock); |
337eb00a | 1211 | |
50a52234 JK |
1212 | /* Store the old options */ |
1213 | old_sb_flags = sb->s_flags; | |
1214 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1215 | old_opts.s_resuid = sbi->s_resuid; | |
1216 | old_opts.s_resgid = sbi->s_resgid; | |
1da177e4 LT |
1217 | |
1218 | /* | |
1219 | * Allow the "check" option to be passed as a remount option. | |
1220 | */ | |
2314b07c | 1221 | if (!parse_options(data, sb)) { |
50a52234 JK |
1222 | err = -EINVAL; |
1223 | goto restore_opts; | |
1224 | } | |
1da177e4 LT |
1225 | |
1226 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1227 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1228 | ||
266f5aa0 CO |
1229 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
1230 | EXT2_MOUNT_XIP if not */ | |
1231 | ||
1232 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { | |
2314b07c OR |
1233 | ext2_msg(sb, KERN_WARNING, |
1234 | "warning: unsupported blocksize for xip"); | |
ddc80bd7 | 1235 | err = -EINVAL; |
266f5aa0 CO |
1236 | goto restore_opts; |
1237 | } | |
1238 | ||
1da177e4 | 1239 | es = sbi->s_es; |
8e3b9a07 | 1240 | if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) { |
2314b07c OR |
1241 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
1242 | "xip flag with busy inodes while remounting"); | |
0e4a9b59 CO |
1243 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; |
1244 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; | |
1245 | } | |
337eb00a | 1246 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
c15271f4 | 1247 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1248 | return 0; |
337eb00a | 1249 | } |
1da177e4 LT |
1250 | if (*flags & MS_RDONLY) { |
1251 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
337eb00a | 1252 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
c15271f4 | 1253 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1254 | return 0; |
337eb00a | 1255 | } |
c79d967d | 1256 | |
1da177e4 LT |
1257 | /* |
1258 | * OK, we are remounting a valid rw partition rdonly, so set | |
1259 | * the rdonly flag and then mark the partition as valid again. | |
1260 | */ | |
1261 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1262 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1263 | spin_unlock(&sbi->s_lock); |
c79d967d | 1264 | |
0f0dd62f CH |
1265 | err = dquot_suspend(sb, -1); |
1266 | if (err < 0) { | |
c79d967d CH |
1267 | spin_lock(&sbi->s_lock); |
1268 | goto restore_opts; | |
1269 | } | |
1270 | ||
4c96a68b | 1271 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1272 | } else { |
1273 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1274 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1275 | if (ret) { | |
2314b07c OR |
1276 | ext2_msg(sb, KERN_WARNING, |
1277 | "warning: couldn't remount RDWR because of " | |
1278 | "unsupported optional features (%x).", | |
1279 | le32_to_cpu(ret)); | |
50a52234 JK |
1280 | err = -EROFS; |
1281 | goto restore_opts; | |
1da177e4 LT |
1282 | } |
1283 | /* | |
1284 | * Mounting a RDONLY partition read-write, so reread and | |
1285 | * store the current valid flag. (It may have been changed | |
1286 | * by e2fsck since we originally mounted the partition.) | |
1287 | */ | |
1288 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1289 | if (!ext2_setup_super (sb, es, 0)) | |
1290 | sb->s_flags &= ~MS_RDONLY; | |
c15271f4 | 1291 | spin_unlock(&sbi->s_lock); |
c79d967d | 1292 | |
4c96a68b | 1293 | ext2_write_super(sb); |
c79d967d | 1294 | |
0f0dd62f | 1295 | dquot_resume(sb, -1); |
1da177e4 | 1296 | } |
c79d967d | 1297 | |
1da177e4 | 1298 | return 0; |
50a52234 JK |
1299 | restore_opts: |
1300 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1301 | sbi->s_resuid = old_opts.s_resuid; | |
1302 | sbi->s_resgid = old_opts.s_resgid; | |
1303 | sb->s_flags = old_sb_flags; | |
c15271f4 | 1304 | spin_unlock(&sbi->s_lock); |
50a52234 | 1305 | return err; |
1da177e4 LT |
1306 | } |
1307 | ||
726c3342 | 1308 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1309 | { |
726c3342 | 1310 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1311 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1312 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1313 | u64 fsid; |
1da177e4 | 1314 | |
c15271f4 JB |
1315 | spin_lock(&sbi->s_lock); |
1316 | ||
1da177e4 | 1317 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1318 | sbi->s_overhead_last = 0; |
1319 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1320 | unsigned long i, overhead = 0; | |
1321 | smp_rmb(); | |
1322 | ||
1da177e4 | 1323 | /* |
2235219b BP |
1324 | * Compute the overhead (FS structures). This is constant |
1325 | * for a given filesystem unless the number of block groups | |
1326 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1327 | */ |
1328 | ||
1329 | /* | |
1330 | * All of the blocks before first_data_block are | |
1331 | * overhead | |
1332 | */ | |
e4fca01e | 1333 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1334 | |
1335 | /* | |
1336 | * Add the overhead attributed to the superblock and | |
1337 | * block group descriptors. If the sparse superblocks | |
1338 | * feature is turned on, then not all groups have this. | |
1339 | */ | |
1340 | for (i = 0; i < sbi->s_groups_count; i++) | |
1341 | overhead += ext2_bg_has_super(sb, i) + | |
1342 | ext2_bg_num_gdb(sb, i); | |
1343 | ||
1344 | /* | |
1345 | * Every block group has an inode bitmap, a block | |
1346 | * bitmap, and an inode table. | |
1347 | */ | |
1348 | overhead += (sbi->s_groups_count * | |
1349 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1350 | sbi->s_overhead_last = overhead; |
1351 | smp_wmb(); | |
1352 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1353 | } |
1354 | ||
1355 | buf->f_type = EXT2_SUPER_MAGIC; | |
1356 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1357 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1358 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1359 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1360 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1361 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1362 | buf->f_bavail = 0; |
e4fca01e PE |
1363 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1364 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1365 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1366 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1367 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1368 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1369 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1370 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1371 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1372 | return 0; |
1373 | } | |
1374 | ||
152a0836 AV |
1375 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1376 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1377 | { |
152a0836 | 1378 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | #ifdef CONFIG_QUOTA | |
1382 | ||
1383 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1384 | * acquiring the locks... As quota files are never truncated and quota code | |
1385 | * itself serializes the operations (and noone else should touch the files) | |
1386 | * we don't have to be afraid of races */ | |
1387 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1388 | size_t len, loff_t off) | |
1389 | { | |
1390 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1391 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1392 | int err = 0; | |
1393 | int offset = off & (sb->s_blocksize - 1); | |
1394 | int tocopy; | |
1395 | size_t toread; | |
1396 | struct buffer_head tmp_bh; | |
1397 | struct buffer_head *bh; | |
1398 | loff_t i_size = i_size_read(inode); | |
1399 | ||
1400 | if (off > i_size) | |
1401 | return 0; | |
1402 | if (off+len > i_size) | |
1403 | len = i_size-off; | |
1404 | toread = len; | |
1405 | while (toread > 0) { | |
1406 | tocopy = sb->s_blocksize - offset < toread ? | |
1407 | sb->s_blocksize - offset : toread; | |
1408 | ||
1409 | tmp_bh.b_state = 0; | |
c16831b4 | 1410 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1411 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1412 | if (err < 0) |
1da177e4 LT |
1413 | return err; |
1414 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1415 | memset(data, 0, tocopy); | |
1416 | else { | |
1417 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1418 | if (!bh) | |
1419 | return -EIO; | |
1420 | memcpy(data, bh->b_data+offset, tocopy); | |
1421 | brelse(bh); | |
1422 | } | |
1423 | offset = 0; | |
1424 | toread -= tocopy; | |
1425 | data += tocopy; | |
1426 | blk++; | |
1427 | } | |
1428 | return len; | |
1429 | } | |
1430 | ||
1431 | /* Write to quotafile */ | |
1432 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1433 | const char *data, size_t len, loff_t off) | |
1434 | { | |
1435 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1436 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1437 | int err = 0; | |
1438 | int offset = off & (sb->s_blocksize - 1); | |
1439 | int tocopy; | |
1440 | size_t towrite = len; | |
1441 | struct buffer_head tmp_bh; | |
1442 | struct buffer_head *bh; | |
1443 | ||
5c81a419 | 1444 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1445 | while (towrite > 0) { |
1446 | tocopy = sb->s_blocksize - offset < towrite ? | |
1447 | sb->s_blocksize - offset : towrite; | |
1448 | ||
1449 | tmp_bh.b_state = 0; | |
1450 | err = ext2_get_block(inode, blk, &tmp_bh, 1); | |
a686cd89 | 1451 | if (err < 0) |
1da177e4 LT |
1452 | goto out; |
1453 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1454 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1455 | else | |
1456 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
1457 | if (!bh) { | |
1458 | err = -EIO; | |
1459 | goto out; | |
1460 | } | |
1461 | lock_buffer(bh); | |
1462 | memcpy(bh->b_data+offset, data, tocopy); | |
1463 | flush_dcache_page(bh->b_page); | |
1464 | set_buffer_uptodate(bh); | |
1465 | mark_buffer_dirty(bh); | |
1466 | unlock_buffer(bh); | |
1467 | brelse(bh); | |
1468 | offset = 0; | |
1469 | towrite -= tocopy; | |
1470 | data += tocopy; | |
1471 | blk++; | |
1472 | } | |
1473 | out: | |
a069e9ce DC |
1474 | if (len == towrite) { |
1475 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 1476 | return err; |
a069e9ce | 1477 | } |
1da177e4 LT |
1478 | if (inode->i_size < off+len-towrite) |
1479 | i_size_write(inode, off+len-towrite); | |
1480 | inode->i_version++; | |
1481 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1482 | mark_inode_dirty(inode); | |
1b1dcc1b | 1483 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1484 | return len - towrite; |
1485 | } | |
1486 | ||
1487 | #endif | |
1488 | ||
1489 | static struct file_system_type ext2_fs_type = { | |
1490 | .owner = THIS_MODULE, | |
1491 | .name = "ext2", | |
152a0836 | 1492 | .mount = ext2_mount, |
1da177e4 LT |
1493 | .kill_sb = kill_block_super, |
1494 | .fs_flags = FS_REQUIRES_DEV, | |
1495 | }; | |
1496 | ||
1497 | static int __init init_ext2_fs(void) | |
1498 | { | |
1499 | int err = init_ext2_xattr(); | |
1500 | if (err) | |
1501 | return err; | |
1502 | err = init_inodecache(); | |
1503 | if (err) | |
1504 | goto out1; | |
1505 | err = register_filesystem(&ext2_fs_type); | |
1506 | if (err) | |
1507 | goto out; | |
1508 | return 0; | |
1509 | out: | |
1510 | destroy_inodecache(); | |
1511 | out1: | |
1512 | exit_ext2_xattr(); | |
1513 | return err; | |
1514 | } | |
1515 | ||
1516 | static void __exit exit_ext2_fs(void) | |
1517 | { | |
1518 | unregister_filesystem(&ext2_fs_type); | |
1519 | destroy_inodecache(); | |
1520 | exit_ext2_xattr(); | |
1521 | } | |
1522 | ||
1523 | module_init(init_ext2_fs) | |
1524 | module_exit(exit_ext2_fs) |