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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> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
ef510424 | 35 | #include <linux/dax.h> |
1da177e4 LT |
36 | #include "ext2.h" |
37 | #include "xattr.h" | |
38 | #include "acl.h" | |
39 | ||
65547661 | 40 | static void ext2_write_super(struct super_block *sb); |
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 | ||
161f3b74 JK |
126 | #ifdef CONFIG_QUOTA |
127 | static int ext2_quota_off(struct super_block *sb, int type); | |
128 | ||
129 | static void ext2_quota_off_umount(struct super_block *sb) | |
130 | { | |
131 | int type; | |
132 | ||
133 | for (type = 0; type < MAXQUOTAS; type++) | |
134 | ext2_quota_off(sb, type); | |
135 | } | |
136 | #else | |
137 | static inline void ext2_quota_off_umount(struct super_block *sb) | |
138 | { | |
139 | } | |
140 | #endif | |
141 | ||
1da177e4 LT |
142 | static void ext2_put_super (struct super_block * sb) |
143 | { | |
144 | int db_count; | |
145 | int i; | |
146 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
147 | ||
161f3b74 | 148 | ext2_quota_off_umount(sb); |
e0ccfd95 | 149 | |
be0726d3 JK |
150 | if (sbi->s_mb_cache) { |
151 | ext2_xattr_destroy_cache(sbi->s_mb_cache); | |
152 | sbi->s_mb_cache = NULL; | |
153 | } | |
1da177e4 LT |
154 | if (!(sb->s_flags & MS_RDONLY)) { |
155 | struct ext2_super_block *es = sbi->s_es; | |
156 | ||
c15271f4 | 157 | spin_lock(&sbi->s_lock); |
1da177e4 | 158 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 159 | spin_unlock(&sbi->s_lock); |
ee6921eb | 160 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
161 | } |
162 | db_count = sbi->s_gdb_count; | |
163 | for (i = 0; i < db_count; i++) | |
164 | if (sbi->s_group_desc[i]) | |
165 | brelse (sbi->s_group_desc[i]); | |
166 | kfree(sbi->s_group_desc); | |
167 | kfree(sbi->s_debts); | |
168 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
169 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
170 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
171 | brelse (sbi->s_sbh); | |
172 | sb->s_fs_info = NULL; | |
18a82eb9 | 173 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 174 | kfree(sbi); |
1da177e4 LT |
175 | } |
176 | ||
e18b890b | 177 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
178 | |
179 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
180 | { | |
181 | struct ext2_inode_info *ei; | |
e625b310 | 182 | ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
183 | if (!ei) |
184 | return NULL; | |
a686cd89 | 185 | ei->i_block_alloc_info = NULL; |
1da177e4 | 186 | ei->vfs_inode.i_version = 1; |
64241118 JK |
187 | #ifdef CONFIG_QUOTA |
188 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); | |
189 | #endif | |
190 | ||
1da177e4 LT |
191 | return &ei->vfs_inode; |
192 | } | |
193 | ||
fa0d7e3d | 194 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 195 | { |
fa0d7e3d | 196 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
197 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
198 | } | |
199 | ||
fa0d7e3d NP |
200 | static void ext2_destroy_inode(struct inode *inode) |
201 | { | |
202 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
203 | } | |
204 | ||
51cc5068 | 205 | static void init_once(void *foo) |
1da177e4 LT |
206 | { |
207 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
208 | ||
a35afb83 | 209 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 210 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 211 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 212 | #endif |
a686cd89 | 213 | mutex_init(&ei->truncate_mutex); |
5726b27b RZ |
214 | #ifdef CONFIG_FS_DAX |
215 | init_rwsem(&ei->dax_sem); | |
216 | #endif | |
a35afb83 | 217 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 218 | } |
20c2df83 | 219 | |
0903353a | 220 | static int __init init_inodecache(void) |
1da177e4 LT |
221 | { |
222 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
223 | sizeof(struct ext2_inode_info), | |
fffb60f9 | 224 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 225 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 226 | init_once); |
1da177e4 LT |
227 | if (ext2_inode_cachep == NULL) |
228 | return -ENOMEM; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static void destroy_inodecache(void) | |
233 | { | |
8c0a8537 KS |
234 | /* |
235 | * Make sure all delayed rcu free inodes are flushed before we | |
236 | * destroy cache. | |
237 | */ | |
238 | rcu_barrier(); | |
1a1d92c1 | 239 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
240 | } |
241 | ||
34c80b1d | 242 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
8fc2751b | 243 | { |
34c80b1d | 244 | struct super_block *sb = root->d_sb; |
93d44cb2 MS |
245 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
246 | struct ext2_super_block *es = sbi->s_es; | |
247 | unsigned long def_mount_opts; | |
8fc2751b | 248 | |
c15271f4 | 249 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
250 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
251 | ||
252 | if (sbi->s_sb_block != 1) | |
253 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
254 | if (test_opt(sb, MINIX_DF)) | |
255 | seq_puts(seq, ",minixdf"); | |
256 | if (test_opt(sb, GRPID)) | |
8fc2751b | 257 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
258 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
259 | seq_puts(seq, ",nogrpid"); | |
b8a9f9e1 | 260 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
93d44cb2 | 261 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
b8a9f9e1 EB |
262 | seq_printf(seq, ",resuid=%u", |
263 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); | |
93d44cb2 | 264 | } |
b8a9f9e1 | 265 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
93d44cb2 | 266 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
b8a9f9e1 EB |
267 | seq_printf(seq, ",resgid=%u", |
268 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); | |
93d44cb2 | 269 | } |
14e11e10 | 270 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
271 | int def_errors = le16_to_cpu(es->s_errors); |
272 | ||
273 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
274 | def_errors == EXT2_ERRORS_CONTINUE) { |
275 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
276 | } |
277 | } | |
14e11e10 AK |
278 | if (test_opt(sb, ERRORS_CONT)) |
279 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
280 | if (test_opt(sb, ERRORS_PANIC)) |
281 | seq_puts(seq, ",errors=panic"); | |
282 | if (test_opt(sb, NO_UID32)) | |
283 | seq_puts(seq, ",nouid32"); | |
284 | if (test_opt(sb, DEBUG)) | |
285 | seq_puts(seq, ",debug"); | |
286 | if (test_opt(sb, OLDALLOC)) | |
287 | seq_puts(seq, ",oldalloc"); | |
288 | ||
289 | #ifdef CONFIG_EXT2_FS_XATTR | |
290 | if (test_opt(sb, XATTR_USER)) | |
291 | seq_puts(seq, ",user_xattr"); | |
292 | if (!test_opt(sb, XATTR_USER) && | |
293 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
294 | seq_puts(seq, ",nouser_xattr"); | |
295 | } | |
296 | #endif | |
297 | ||
298 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
299 | if (test_opt(sb, POSIX_ACL)) | |
300 | seq_puts(seq, ",acl"); | |
301 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
302 | seq_puts(seq, ",noacl"); | |
303 | #endif | |
304 | ||
305 | if (test_opt(sb, NOBH)) | |
306 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
307 | |
308 | #if defined(CONFIG_QUOTA) | |
309 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
310 | seq_puts(seq, ",usrquota"); | |
311 | ||
312 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
313 | seq_puts(seq, ",grpquota"); | |
314 | #endif | |
315 | ||
6cd176a5 | 316 | #ifdef CONFIG_FS_DAX |
83541796 CO |
317 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) |
318 | seq_puts(seq, ",xip"); | |
9c3ce9ec MW |
319 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) |
320 | seq_puts(seq, ",dax"); | |
83541796 CO |
321 | #endif |
322 | ||
35c879dc MS |
323 | if (!test_opt(sb, RESERVATION)) |
324 | seq_puts(seq, ",noreservation"); | |
325 | ||
c15271f4 | 326 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
327 | return 0; |
328 | } | |
329 | ||
1da177e4 LT |
330 | #ifdef CONFIG_QUOTA |
331 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
332 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
161f3b74 JK |
333 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
334 | const struct path *path); | |
64241118 JK |
335 | static struct dquot **ext2_get_dquots(struct inode *inode) |
336 | { | |
337 | return EXT2_I(inode)->i_dquot; | |
338 | } | |
161f3b74 JK |
339 | |
340 | static const struct quotactl_ops ext2_quotactl_ops = { | |
341 | .quota_on = ext2_quota_on, | |
342 | .quota_off = ext2_quota_off, | |
343 | .quota_sync = dquot_quota_sync, | |
344 | .get_state = dquot_get_state, | |
345 | .set_info = dquot_set_dqinfo, | |
346 | .get_dqblk = dquot_get_dqblk, | |
347 | .set_dqblk = dquot_set_dqblk, | |
348 | .get_nextdqblk = dquot_get_next_dqblk, | |
349 | }; | |
1da177e4 LT |
350 | #endif |
351 | ||
ee9b6d61 | 352 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
353 | .alloc_inode = ext2_alloc_inode, |
354 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 355 | .write_inode = ext2_write_inode, |
72edc4d0 | 356 | .evict_inode = ext2_evict_inode, |
1da177e4 | 357 | .put_super = ext2_put_super, |
40f31dd4 | 358 | .sync_fs = ext2_sync_fs, |
1e8b212f JK |
359 | .freeze_fs = ext2_freeze, |
360 | .unfreeze_fs = ext2_unfreeze, | |
1da177e4 LT |
361 | .statfs = ext2_statfs, |
362 | .remount_fs = ext2_remount, | |
8fc2751b | 363 | .show_options = ext2_show_options, |
1da177e4 LT |
364 | #ifdef CONFIG_QUOTA |
365 | .quota_read = ext2_quota_read, | |
366 | .quota_write = ext2_quota_write, | |
64241118 | 367 | .get_dquots = ext2_get_dquots, |
1da177e4 LT |
368 | #endif |
369 | }; | |
370 | ||
2e4c68e3 CH |
371 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
372 | u64 ino, u32 generation) | |
ecaff756 | 373 | { |
ecaff756 | 374 | struct inode *inode; |
ecaff756 N |
375 | |
376 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
377 | return ERR_PTR(-ESTALE); | |
378 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
379 | return ERR_PTR(-ESTALE); | |
380 | ||
f32948dd LH |
381 | /* |
382 | * ext2_iget isn't quite right if the inode is currently unallocated! | |
383 | * However ext2_iget currently does appropriate checks to handle stale | |
384 | * inodes so everything is OK. | |
ecaff756 | 385 | */ |
52fcf703 DH |
386 | inode = ext2_iget(sb, ino); |
387 | if (IS_ERR(inode)) | |
388 | return ERR_CAST(inode); | |
389 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
390 | /* we didn't find the right inode.. */ |
391 | iput(inode); | |
392 | return ERR_PTR(-ESTALE); | |
393 | } | |
2e4c68e3 CH |
394 | return inode; |
395 | } | |
396 | ||
397 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
398 | int fh_len, int fh_type) | |
399 | { | |
400 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
401 | ext2_nfs_get_inode); | |
402 | } | |
403 | ||
404 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
405 | int fh_len, int fh_type) | |
406 | { | |
407 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
408 | ext2_nfs_get_inode); | |
ecaff756 N |
409 | } |
410 | ||
39655164 | 411 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
412 | .fh_to_dentry = ext2_fh_to_dentry, |
413 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
414 | .get_parent = ext2_get_parent, |
415 | }; | |
416 | ||
417 | static unsigned long get_sb_block(void **data) | |
418 | { | |
419 | unsigned long sb_block; | |
420 | char *options = (char *) *data; | |
421 | ||
422 | if (!options || strncmp(options, "sb=", 3) != 0) | |
423 | return 1; /* Default location */ | |
424 | options += 3; | |
425 | sb_block = simple_strtoul(options, &options, 0); | |
426 | if (*options && *options != ',') { | |
427 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
428 | (char *) *data); | |
429 | return 1; | |
430 | } | |
431 | if (*options == ',') | |
432 | options++; | |
433 | *data = (void *) options; | |
434 | return sb_block; | |
435 | } | |
436 | ||
437 | enum { | |
438 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 439 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 440 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b | 441 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
9c3ce9ec | 442 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
a686cd89 | 443 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
444 | }; |
445 | ||
a447c093 | 446 | static const match_table_t tokens = { |
1da177e4 LT |
447 | {Opt_bsd_df, "bsddf"}, |
448 | {Opt_minix_df, "minixdf"}, | |
449 | {Opt_grpid, "grpid"}, | |
450 | {Opt_grpid, "bsdgroups"}, | |
451 | {Opt_nogrpid, "nogrpid"}, | |
452 | {Opt_nogrpid, "sysvgroups"}, | |
453 | {Opt_resgid, "resgid=%u"}, | |
454 | {Opt_resuid, "resuid=%u"}, | |
455 | {Opt_sb, "sb=%u"}, | |
456 | {Opt_err_cont, "errors=continue"}, | |
457 | {Opt_err_panic, "errors=panic"}, | |
458 | {Opt_err_ro, "errors=remount-ro"}, | |
459 | {Opt_nouid32, "nouid32"}, | |
460 | {Opt_nocheck, "check=none"}, | |
461 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
462 | {Opt_debug, "debug"}, |
463 | {Opt_oldalloc, "oldalloc"}, | |
464 | {Opt_orlov, "orlov"}, | |
465 | {Opt_nobh, "nobh"}, | |
466 | {Opt_user_xattr, "user_xattr"}, | |
467 | {Opt_nouser_xattr, "nouser_xattr"}, | |
468 | {Opt_acl, "acl"}, | |
469 | {Opt_noacl, "noacl"}, | |
6d79125b | 470 | {Opt_xip, "xip"}, |
9c3ce9ec | 471 | {Opt_dax, "dax"}, |
8fc2751b | 472 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 473 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
474 | {Opt_quota, "quota"}, |
475 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
476 | {Opt_reservation, "reservation"}, |
477 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
478 | {Opt_err, NULL} |
479 | }; | |
480 | ||
2314b07c | 481 | static int parse_options(char *options, struct super_block *sb) |
1da177e4 | 482 | { |
2314b07c AF |
483 | char *p; |
484 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1da177e4 | 485 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 | 486 | int option; |
b8a9f9e1 EB |
487 | kuid_t uid; |
488 | kgid_t gid; | |
1da177e4 LT |
489 | |
490 | if (!options) | |
491 | return 1; | |
492 | ||
493 | while ((p = strsep (&options, ",")) != NULL) { | |
494 | int token; | |
495 | if (!*p) | |
496 | continue; | |
497 | ||
498 | token = match_token(p, tokens, args); | |
499 | switch (token) { | |
500 | case Opt_bsd_df: | |
501 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
502 | break; | |
503 | case Opt_minix_df: | |
504 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
505 | break; | |
506 | case Opt_grpid: | |
507 | set_opt (sbi->s_mount_opt, GRPID); | |
508 | break; | |
509 | case Opt_nogrpid: | |
510 | clear_opt (sbi->s_mount_opt, GRPID); | |
511 | break; | |
512 | case Opt_resuid: | |
513 | if (match_int(&args[0], &option)) | |
514 | return 0; | |
b8a9f9e1 EB |
515 | uid = make_kuid(current_user_ns(), option); |
516 | if (!uid_valid(uid)) { | |
517 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); | |
ae2cf428 | 518 | return 0; |
b8a9f9e1 EB |
519 | |
520 | } | |
521 | sbi->s_resuid = uid; | |
1da177e4 LT |
522 | break; |
523 | case Opt_resgid: | |
524 | if (match_int(&args[0], &option)) | |
525 | return 0; | |
b8a9f9e1 EB |
526 | gid = make_kgid(current_user_ns(), option); |
527 | if (!gid_valid(gid)) { | |
528 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); | |
ae2cf428 | 529 | return 0; |
b8a9f9e1 EB |
530 | } |
531 | sbi->s_resgid = gid; | |
1da177e4 LT |
532 | break; |
533 | case Opt_sb: | |
534 | /* handled by get_sb_block() instead of here */ | |
535 | /* *sb_block = match_int(&args[0]); */ | |
536 | break; | |
537 | case Opt_err_panic: | |
5a2b4062 VA |
538 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
539 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
540 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
541 | break; |
542 | case Opt_err_ro: | |
5a2b4062 VA |
543 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
544 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
545 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
546 | break; |
547 | case Opt_err_cont: | |
5a2b4062 VA |
548 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
549 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
550 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
551 | break; |
552 | case Opt_nouid32: | |
553 | set_opt (sbi->s_mount_opt, NO_UID32); | |
554 | break; | |
1da177e4 LT |
555 | case Opt_nocheck: |
556 | clear_opt (sbi->s_mount_opt, CHECK); | |
557 | break; | |
558 | case Opt_debug: | |
559 | set_opt (sbi->s_mount_opt, DEBUG); | |
560 | break; | |
561 | case Opt_oldalloc: | |
562 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
563 | break; | |
564 | case Opt_orlov: | |
565 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
566 | break; | |
567 | case Opt_nobh: | |
568 | set_opt (sbi->s_mount_opt, NOBH); | |
569 | break; | |
570 | #ifdef CONFIG_EXT2_FS_XATTR | |
571 | case Opt_user_xattr: | |
572 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
573 | break; | |
574 | case Opt_nouser_xattr: | |
575 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
576 | break; | |
577 | #else | |
578 | case Opt_user_xattr: | |
579 | case Opt_nouser_xattr: | |
2314b07c AF |
580 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
581 | "not supported"); | |
1da177e4 LT |
582 | break; |
583 | #endif | |
584 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
585 | case Opt_acl: | |
586 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
587 | break; | |
588 | case Opt_noacl: | |
589 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
590 | break; | |
591 | #else | |
592 | case Opt_acl: | |
593 | case Opt_noacl: | |
2314b07c AF |
594 | ext2_msg(sb, KERN_INFO, |
595 | "(no)acl options not supported"); | |
1da177e4 LT |
596 | break; |
597 | #endif | |
6d79125b | 598 | case Opt_xip: |
9c3ce9ec MW |
599 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
600 | set_opt(sbi->s_mount_opt, XIP); | |
601 | /* Fall through */ | |
602 | case Opt_dax: | |
6cd176a5 | 603 | #ifdef CONFIG_FS_DAX |
ef83b6e8 DW |
604 | ext2_msg(sb, KERN_WARNING, |
605 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); | |
9c3ce9ec | 606 | set_opt(sbi->s_mount_opt, DAX); |
6d79125b | 607 | #else |
9c3ce9ec | 608 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
6d79125b CO |
609 | #endif |
610 | break; | |
8fc2751b MB |
611 | |
612 | #if defined(CONFIG_QUOTA) | |
613 | case Opt_quota: | |
614 | case Opt_usrquota: | |
615 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
616 | break; | |
617 | ||
618 | case Opt_grpquota: | |
619 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
620 | break; | |
621 | #else | |
622 | case Opt_quota: | |
623 | case Opt_usrquota: | |
624 | case Opt_grpquota: | |
2314b07c AF |
625 | ext2_msg(sb, KERN_INFO, |
626 | "quota operations not supported"); | |
8fc2751b MB |
627 | break; |
628 | #endif | |
629 | ||
a686cd89 MB |
630 | case Opt_reservation: |
631 | set_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 632 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
633 | break; |
634 | case Opt_noreservation: | |
635 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 636 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 637 | break; |
1da177e4 LT |
638 | case Opt_ignore: |
639 | break; | |
640 | default: | |
641 | return 0; | |
642 | } | |
643 | } | |
1da177e4 LT |
644 | return 1; |
645 | } | |
646 | ||
647 | static int ext2_setup_super (struct super_block * sb, | |
648 | struct ext2_super_block * es, | |
649 | int read_only) | |
650 | { | |
651 | int res = 0; | |
652 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
653 | ||
654 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c AF |
655 | ext2_msg(sb, KERN_ERR, |
656 | "error: revision level too high, " | |
657 | "forcing read-only mode"); | |
1da177e4 LT |
658 | res = MS_RDONLY; |
659 | } | |
660 | if (read_only) | |
661 | return res; | |
662 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c AF |
663 | ext2_msg(sb, KERN_WARNING, |
664 | "warning: mounting unchecked fs, " | |
665 | "running e2fsck is recommended"); | |
1da177e4 | 666 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c AF |
667 | ext2_msg(sb, KERN_WARNING, |
668 | "warning: mounting fs with errors, " | |
669 | "running e2fsck is recommended"); | |
1da177e4 LT |
670 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
671 | le16_to_cpu(es->s_mnt_count) >= | |
672 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c AF |
673 | ext2_msg(sb, KERN_WARNING, |
674 | "warning: maximal mount count reached, " | |
675 | "running e2fsck is recommended"); | |
1da177e4 | 676 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c AF |
677 | (le32_to_cpu(es->s_lastcheck) + |
678 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
679 | ext2_msg(sb, KERN_WARNING, | |
680 | "warning: checktime reached, " | |
681 | "running e2fsck is recommended"); | |
1da177e4 LT |
682 | if (!le16_to_cpu(es->s_max_mnt_count)) |
683 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 684 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 685 | if (test_opt (sb, DEBUG)) |
2314b07c AF |
686 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
687 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
688 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
689 | sbi->s_frag_size, | |
690 | sbi->s_groups_count, | |
691 | EXT2_BLOCKS_PER_GROUP(sb), | |
692 | EXT2_INODES_PER_GROUP(sb), | |
693 | sbi->s_mount_opt); | |
1da177e4 LT |
694 | return res; |
695 | } | |
696 | ||
197cd65a | 697 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
698 | { |
699 | int i; | |
1da177e4 | 700 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
701 | |
702 | ext2_debug ("Checking group descriptors"); | |
703 | ||
197cd65a AM |
704 | for (i = 0; i < sbi->s_groups_count; i++) { |
705 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
706 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
707 | ext2_fsblk_t last_block; | |
197cd65a | 708 | |
41f04d85 ES |
709 | if (i == sbi->s_groups_count - 1) |
710 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
711 | else | |
712 | last_block = first_block + | |
713 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
714 | ||
41f04d85 ES |
715 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
716 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
717 | { |
718 | ext2_error (sb, "ext2_check_descriptors", | |
719 | "Block bitmap for group %d" | |
720 | " not in group (block %lu)!", | |
721 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
722 | return 0; | |
723 | } | |
41f04d85 ES |
724 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
725 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
726 | { |
727 | ext2_error (sb, "ext2_check_descriptors", | |
728 | "Inode bitmap for group %d" | |
729 | " not in group (block %lu)!", | |
730 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
731 | return 0; | |
732 | } | |
41f04d85 | 733 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 734 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 735 | last_block) |
1da177e4 LT |
736 | { |
737 | ext2_error (sb, "ext2_check_descriptors", | |
738 | "Inode table for group %d" | |
739 | " not in group (block %lu)!", | |
740 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
741 | return 0; | |
742 | } | |
1da177e4 LT |
743 | } |
744 | return 1; | |
745 | } | |
746 | ||
1da177e4 LT |
747 | /* |
748 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
749 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
750 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
751 | */ | |
752 | static loff_t ext2_max_size(int bits) | |
753 | { | |
754 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
755 | int meta_blocks; |
756 | loff_t upper_limit; | |
757 | ||
758 | /* This is calculated to be the largest file size for a | |
759 | * dense, file such that the total number of | |
1da177e4 | 760 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
761 | * does not exceed 2^32 -1 |
762 | * __u32 i_blocks representing the total number of | |
763 | * 512 bytes blocks of the file | |
764 | */ | |
765 | upper_limit = (1LL << 32) - 1; | |
766 | ||
767 | /* total blocks in file system block size */ | |
768 | upper_limit >>= (bits - 9); | |
769 | ||
770 | ||
771 | /* indirect blocks */ | |
772 | meta_blocks = 1; | |
773 | /* double indirect blocks */ | |
774 | meta_blocks += 1 + (1LL << (bits-2)); | |
775 | /* tripple indirect blocks */ | |
776 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
777 | ||
778 | upper_limit -= meta_blocks; | |
779 | upper_limit <<= bits; | |
1da177e4 LT |
780 | |
781 | res += 1LL << (bits-2); | |
782 | res += 1LL << (2*(bits-2)); | |
783 | res += 1LL << (3*(bits-2)); | |
784 | res <<= bits; | |
785 | if (res > upper_limit) | |
786 | res = upper_limit; | |
902be4c5 AK |
787 | |
788 | if (res > MAX_LFS_FILESIZE) | |
789 | res = MAX_LFS_FILESIZE; | |
790 | ||
1da177e4 LT |
791 | return res; |
792 | } | |
793 | ||
794 | static unsigned long descriptor_loc(struct super_block *sb, | |
795 | unsigned long logic_sb_block, | |
796 | int nr) | |
797 | { | |
798 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 799 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
800 | int has_super = 0; |
801 | ||
1da177e4 LT |
802 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
803 | ||
804 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
805 | nr < first_meta_bg) | |
806 | return (logic_sb_block + nr + 1); | |
807 | bg = sbi->s_desc_per_block * nr; | |
808 | if (ext2_bg_has_super(sb, bg)) | |
809 | has_super = 1; | |
24097d12 AM |
810 | |
811 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
812 | } |
813 | ||
814 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
815 | { | |
816 | struct buffer_head * bh; | |
817 | struct ext2_sb_info * sbi; | |
818 | struct ext2_super_block * es; | |
819 | struct inode *root; | |
820 | unsigned long block; | |
821 | unsigned long sb_block = get_sb_block(&data); | |
822 | unsigned long logic_sb_block; | |
823 | unsigned long offset = 0; | |
824 | unsigned long def_mount_opts; | |
52fcf703 | 825 | long ret = -EINVAL; |
1da177e4 LT |
826 | int blocksize = BLOCK_SIZE; |
827 | int db_count; | |
828 | int i, j; | |
829 | __le32 features; | |
833f4077 | 830 | int err; |
1da177e4 | 831 | |
db719222 | 832 | err = -ENOMEM; |
f8314dc6 | 833 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 834 | if (!sbi) |
e124a320 | 835 | goto failed; |
18a82eb9 PE |
836 | |
837 | sbi->s_blockgroup_lock = | |
838 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
839 | if (!sbi->s_blockgroup_lock) { | |
840 | kfree(sbi); | |
e124a320 | 841 | goto failed; |
18a82eb9 | 842 | } |
1da177e4 | 843 | sb->s_fs_info = sbi; |
93d44cb2 | 844 | sbi->s_sb_block = sb_block; |
1da177e4 | 845 | |
c15271f4 JB |
846 | spin_lock_init(&sbi->s_lock); |
847 | ||
1da177e4 LT |
848 | /* |
849 | * See what the current blocksize for the device is, and | |
850 | * use that as the blocksize. Otherwise (or if the blocksize | |
851 | * is smaller than the default) use the default. | |
852 | * This is important for devices that have a hardware | |
853 | * sectorsize that is larger than the default. | |
854 | */ | |
855 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
856 | if (!blocksize) { | |
2314b07c | 857 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
858 | goto failed_sbi; |
859 | } | |
860 | ||
861 | /* | |
862 | * If the superblock doesn't start on a hardware sector boundary, | |
863 | * calculate the offset. | |
864 | */ | |
865 | if (blocksize != BLOCK_SIZE) { | |
866 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
867 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
868 | } else { | |
869 | logic_sb_block = sb_block; | |
870 | } | |
871 | ||
872 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 873 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
874 | goto failed_sbi; |
875 | } | |
876 | /* | |
877 | * Note: s_es must be initialized as soon as possible because | |
878 | * some ext2 macro-instructions depend on its value | |
879 | */ | |
880 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
881 | sbi->s_es = es; | |
882 | sb->s_magic = le16_to_cpu(es->s_magic); | |
883 | ||
884 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
885 | goto cantfind_ext2; | |
886 | ||
887 | /* Set defaults before we parse the mount options */ | |
888 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
889 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
890 | set_opt(sbi->s_mount_opt, DEBUG); | |
891 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
892 | set_opt(sbi->s_mount_opt, GRPID); | |
893 | if (def_mount_opts & EXT2_DEFM_UID16) | |
894 | set_opt(sbi->s_mount_opt, NO_UID32); | |
2e7842b8 | 895 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 LT |
896 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
897 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
2e7842b8 HD |
898 | #endif |
899 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 LT |
900 | if (def_mount_opts & EXT2_DEFM_ACL) |
901 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
2e7842b8 | 902 | #endif |
1da177e4 LT |
903 | |
904 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
905 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
14e11e10 | 906 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
5a2b4062 | 907 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
14e11e10 AK |
908 | else |
909 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 | 910 | |
b8a9f9e1 EB |
911 | sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
912 | sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 913 | |
a686cd89 MB |
914 | set_opt(sbi->s_mount_opt, RESERVATION); |
915 | ||
2314b07c | 916 | if (!parse_options((char *) data, sb)) |
1da177e4 LT |
917 | goto failed_mount; |
918 | ||
919 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
920 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
921 | MS_POSIXACL : 0); | |
46b15caa | 922 | sb->s_iflags |= SB_I_CGROUPWB; |
1da177e4 LT |
923 | |
924 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
925 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
926 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
927 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c AF |
928 | ext2_msg(sb, KERN_WARNING, |
929 | "warning: feature flags set on rev 0 fs, " | |
930 | "running e2fsck is recommended"); | |
1da177e4 LT |
931 | /* |
932 | * Check feature flags regardless of the revision level, since we | |
933 | * previously didn't change the revision level when setting the flags, | |
934 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
935 | */ | |
936 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
937 | if (features) { | |
2314b07c AF |
938 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
939 | "unsupported optional features (%x)", | |
940 | le32_to_cpu(features)); | |
1da177e4 LT |
941 | goto failed_mount; |
942 | } | |
943 | if (!(sb->s_flags & MS_RDONLY) && | |
944 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
2314b07c AF |
945 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
946 | "unsupported optional features (%x)", | |
947 | le32_to_cpu(features)); | |
1da177e4 LT |
948 | goto failed_mount; |
949 | } | |
950 | ||
951 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
952 | ||
9c3ce9ec | 953 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { |
284854be TK |
954 | err = bdev_dax_supported(sb, blocksize); |
955 | if (err) | |
0de4830f | 956 | goto failed_mount; |
6d79125b CO |
957 | } |
958 | ||
1da177e4 LT |
959 | /* If the blocksize doesn't match, re-read the thing.. */ |
960 | if (sb->s_blocksize != blocksize) { | |
961 | brelse(bh); | |
962 | ||
963 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
964 | ext2_msg(sb, KERN_ERR, |
965 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
966 | goto failed_sbi; |
967 | } | |
968 | ||
969 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
970 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
971 | bh = sb_bread(sb, logic_sb_block); | |
972 | if(!bh) { | |
2314b07c AF |
973 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
974 | "superblock on 2nd try"); | |
1da177e4 LT |
975 | goto failed_sbi; |
976 | } | |
977 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
978 | sbi->s_es = es; | |
979 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 980 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
981 | goto failed_mount; |
982 | } | |
983 | } | |
984 | ||
985 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 986 | sb->s_max_links = EXT2_LINK_MAX; |
1da177e4 LT |
987 | |
988 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
989 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
990 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
991 | } else { | |
992 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
993 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
994 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 995 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 996 | (sbi->s_inode_size > blocksize)) { |
2314b07c AF |
997 | ext2_msg(sb, KERN_ERR, |
998 | "error: unsupported inode size: %d", | |
1da177e4 LT |
999 | sbi->s_inode_size); |
1000 | goto failed_mount; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
1005 | le32_to_cpu(es->s_log_frag_size); | |
1006 | if (sbi->s_frag_size == 0) | |
1007 | goto cantfind_ext2; | |
1008 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
1009 | ||
1010 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1011 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1012 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1013 | ||
1014 | if (EXT2_INODE_SIZE(sb) == 0) | |
1015 | goto cantfind_ext2; | |
1016 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 1017 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
1018 | goto cantfind_ext2; |
1019 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1020 | sbi->s_inodes_per_block; | |
1021 | sbi->s_desc_per_block = sb->s_blocksize / | |
1022 | sizeof (struct ext2_group_desc); | |
1023 | sbi->s_sbh = bh; | |
1024 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1025 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 1026 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 1027 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 1028 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
1029 | |
1030 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
1031 | goto cantfind_ext2; | |
1032 | ||
1033 | if (sb->s_blocksize != bh->b_size) { | |
1034 | if (!silent) | |
2314b07c | 1035 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
1036 | goto failed_mount; |
1037 | } | |
1038 | ||
1039 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c AF |
1040 | ext2_msg(sb, KERN_ERR, |
1041 | "error: fragsize %lu != blocksize %lu" | |
1042 | "(not supported yet)", | |
1da177e4 LT |
1043 | sbi->s_frag_size, sb->s_blocksize); |
1044 | goto failed_mount; | |
1045 | } | |
1046 | ||
1047 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1048 | ext2_msg(sb, KERN_ERR, |
1049 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1050 | sbi->s_blocks_per_group); |
1051 | goto failed_mount; | |
1052 | } | |
1053 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1054 | ext2_msg(sb, KERN_ERR, |
1055 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1056 | sbi->s_frags_per_group); |
1057 | goto failed_mount; | |
1058 | } | |
1059 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1060 | ext2_msg(sb, KERN_ERR, |
1061 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1062 | sbi->s_inodes_per_group); |
1063 | goto failed_mount; | |
1064 | } | |
1065 | ||
1066 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1067 | goto cantfind_ext2; | |
41f04d85 ES |
1068 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1069 | le32_to_cpu(es->s_first_data_block) - 1) | |
1070 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1071 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1072 | EXT2_DESC_PER_BLOCK(sb); | |
1073 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1074 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1075 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1076 | goto failed_mount; |
1077 | } | |
18a82eb9 | 1078 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1079 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1080 | if (!sbi->s_debts) { |
2314b07c | 1081 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1082 | goto failed_mount_group_desc; |
1083 | } | |
1da177e4 LT |
1084 | for (i = 0; i < db_count; i++) { |
1085 | block = descriptor_loc(sb, logic_sb_block, i); | |
1086 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1087 | if (!sbi->s_group_desc[i]) { | |
1088 | for (j = 0; j < i; j++) | |
1089 | brelse (sbi->s_group_desc[j]); | |
2314b07c AF |
1090 | ext2_msg(sb, KERN_ERR, |
1091 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1092 | goto failed_mount_group_desc; |
1093 | } | |
1094 | } | |
1095 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1096 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1097 | goto failed_mount2; |
1098 | } | |
1099 | sbi->s_gdb_count = db_count; | |
1100 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1101 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1102 | |
a686cd89 MB |
1103 | /* per fileystem reservation list head & lock */ |
1104 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1105 | sbi->s_rsv_window_root = RB_ROOT; | |
1106 | /* | |
1107 | * Add a single, static dummy reservation to the start of the | |
1108 | * reservation window list --- it gives us a placeholder for | |
1109 | * append-at-start-of-list which makes the allocation logic | |
1110 | * _much_ simpler. | |
1111 | */ | |
1112 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1113 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1114 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1115 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1116 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1117 | ||
833f4077 | 1118 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1119 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1120 | if (!err) { |
1121 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1122 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1123 | } |
1124 | if (!err) { | |
1125 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1126 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1127 | } |
1128 | if (err) { | |
2314b07c | 1129 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1130 | goto failed_mount3; |
1131 | } | |
be0726d3 JK |
1132 | |
1133 | #ifdef CONFIG_EXT2_FS_XATTR | |
1134 | sbi->s_mb_cache = ext2_xattr_create_cache(); | |
1135 | if (!sbi->s_mb_cache) { | |
1136 | ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache"); | |
1137 | goto failed_mount3; | |
1138 | } | |
1139 | #endif | |
1da177e4 LT |
1140 | /* |
1141 | * set up enough so that it can read an inode | |
1142 | */ | |
1143 | sb->s_op = &ext2_sops; | |
1144 | sb->s_export_op = &ext2_export_ops; | |
1145 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1146 | |
1147 | #ifdef CONFIG_QUOTA | |
1148 | sb->dq_op = &dquot_operations; | |
161f3b74 | 1149 | sb->s_qcop = &ext2_quotactl_ops; |
64241118 | 1150 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1151 | #endif |
1152 | ||
52fcf703 DH |
1153 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1154 | if (IS_ERR(root)) { | |
1155 | ret = PTR_ERR(root); | |
0216bfcf | 1156 | goto failed_mount3; |
1da177e4 LT |
1157 | } |
1158 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1159 | iput(root); |
2314b07c | 1160 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1161 | goto failed_mount3; |
1da177e4 | 1162 | } |
52fcf703 | 1163 | |
48fde701 | 1164 | sb->s_root = d_make_root(root); |
52fcf703 | 1165 | if (!sb->s_root) { |
2314b07c | 1166 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1167 | ret = -ENOMEM; |
1168 | goto failed_mount3; | |
1169 | } | |
1da177e4 | 1170 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c AF |
1171 | ext2_msg(sb, KERN_WARNING, |
1172 | "warning: mounting ext3 filesystem as ext2"); | |
4c96a68b JB |
1173 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
1174 | sb->s_flags |= MS_RDONLY; | |
1175 | ext2_write_super(sb); | |
1da177e4 LT |
1176 | return 0; |
1177 | ||
1178 | cantfind_ext2: | |
1179 | if (!silent) | |
2314b07c AF |
1180 | ext2_msg(sb, KERN_ERR, |
1181 | "error: can't find an ext2 filesystem on dev %s.", | |
1182 | sb->s_id); | |
1da177e4 | 1183 | goto failed_mount; |
0216bfcf | 1184 | failed_mount3: |
be0726d3 JK |
1185 | if (sbi->s_mb_cache) |
1186 | ext2_xattr_destroy_cache(sbi->s_mb_cache); | |
0216bfcf MC |
1187 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
1188 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1189 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1190 | failed_mount2: |
1191 | for (i = 0; i < db_count; i++) | |
1192 | brelse(sbi->s_group_desc[i]); | |
1193 | failed_mount_group_desc: | |
1194 | kfree(sbi->s_group_desc); | |
1195 | kfree(sbi->s_debts); | |
1196 | failed_mount: | |
1197 | brelse(bh); | |
1198 | failed_sbi: | |
1199 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1200 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1201 | kfree(sbi); |
e124a320 | 1202 | failed: |
52fcf703 | 1203 | return ret; |
1da177e4 LT |
1204 | } |
1205 | ||
7bf0dc9b TT |
1206 | static void ext2_clear_super_error(struct super_block *sb) |
1207 | { | |
1208 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1209 | ||
1210 | if (buffer_write_io_error(sbh)) { | |
1211 | /* | |
1212 | * Oh, dear. A previous attempt to write the | |
1213 | * superblock failed. This could happen because the | |
1214 | * USB device was yanked out. Or it could happen to | |
1215 | * be a transient write error and maybe the block will | |
1216 | * be remapped. Nothing we can do but to retry the | |
1217 | * write and hope for the best. | |
1218 | */ | |
2b8120ef JB |
1219 | ext2_msg(sb, KERN_ERR, |
1220 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1221 | clear_buffer_write_io_error(sbh); |
1222 | set_buffer_uptodate(sbh); | |
1223 | } | |
1224 | } | |
1225 | ||
65547661 JK |
1226 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1227 | int wait) | |
1da177e4 | 1228 | { |
7bf0dc9b | 1229 | ext2_clear_super_error(sb); |
c15271f4 | 1230 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1231 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1232 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1233 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1234 | /* unlock before we do IO */ |
1235 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1236 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1237 | if (wait) |
1238 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | /* | |
1242 | * In the second extended file system, it is not necessary to | |
1243 | * write the super block since we use a mapping of the | |
1244 | * disk super block in a buffer. | |
1245 | * | |
1246 | * However, this function is still used to set the fs valid | |
1247 | * flags to 0. We need to set this flag to 0 since the fs | |
1248 | * may have been checked while mounted and e2fsck may have | |
1249 | * set s_state to EXT2_VALID_FS after some corrections. | |
1250 | */ | |
40f31dd4 | 1251 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1252 | { |
c15271f4 | 1253 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1254 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1255 | ||
a1177825 JK |
1256 | /* |
1257 | * Write quota structures to quota file, sync_blockdev() will write | |
1258 | * them to disk later | |
1259 | */ | |
1260 | dquot_writeback_dquots(sb, -1); | |
1261 | ||
c15271f4 | 1262 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1263 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1264 | ext2_debug("setting valid to 0\n"); | |
1265 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1266 | } |
c15271f4 | 1267 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1268 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1269 | return 0; |
1270 | } | |
1271 | ||
1e8b212f JK |
1272 | static int ext2_freeze(struct super_block *sb) |
1273 | { | |
1274 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1275 | ||
1276 | /* | |
1277 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1278 | * because we have unattached inodes and thus filesystem is not fully | |
1279 | * consistent. | |
1280 | */ | |
1281 | if (atomic_long_read(&sb->s_remove_count)) { | |
1282 | ext2_sync_fs(sb, 1); | |
1283 | return 0; | |
1284 | } | |
1285 | /* Set EXT2_FS_VALID flag */ | |
1286 | spin_lock(&sbi->s_lock); | |
1287 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1288 | spin_unlock(&sbi->s_lock); | |
1289 | ext2_sync_super(sb, sbi->s_es, 1); | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static int ext2_unfreeze(struct super_block *sb) | |
1295 | { | |
1296 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1297 | ext2_write_super(sb); | |
1298 | ||
1299 | return 0; | |
1300 | } | |
40f31dd4 | 1301 | |
65547661 | 1302 | static void ext2_write_super(struct super_block *sb) |
40f31dd4 CH |
1303 | { |
1304 | if (!(sb->s_flags & MS_RDONLY)) | |
1305 | ext2_sync_fs(sb, 1); | |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1309 | { | |
1310 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1311 | struct ext2_super_block * es; | |
50a52234 JK |
1312 | struct ext2_mount_options old_opts; |
1313 | unsigned long old_sb_flags; | |
1314 | int err; | |
1315 | ||
02b9984d | 1316 | sync_filesystem(sb); |
c15271f4 | 1317 | spin_lock(&sbi->s_lock); |
337eb00a | 1318 | |
50a52234 JK |
1319 | /* Store the old options */ |
1320 | old_sb_flags = sb->s_flags; | |
1321 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1322 | old_opts.s_resuid = sbi->s_resuid; | |
1323 | old_opts.s_resgid = sbi->s_resgid; | |
1da177e4 LT |
1324 | |
1325 | /* | |
1326 | * Allow the "check" option to be passed as a remount option. | |
1327 | */ | |
2314b07c | 1328 | if (!parse_options(data, sb)) { |
50a52234 JK |
1329 | err = -EINVAL; |
1330 | goto restore_opts; | |
1331 | } | |
1da177e4 LT |
1332 | |
1333 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1334 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1335 | ||
1336 | es = sbi->s_es; | |
9c3ce9ec | 1337 | if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
2314b07c | 1338 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
9c3ce9ec MW |
1339 | "dax flag with busy inodes while remounting"); |
1340 | sbi->s_mount_opt ^= EXT2_MOUNT_DAX; | |
0e4a9b59 | 1341 | } |
337eb00a | 1342 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
c15271f4 | 1343 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1344 | return 0; |
337eb00a | 1345 | } |
1da177e4 LT |
1346 | if (*flags & MS_RDONLY) { |
1347 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
337eb00a | 1348 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
c15271f4 | 1349 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1350 | return 0; |
337eb00a | 1351 | } |
c79d967d | 1352 | |
1da177e4 LT |
1353 | /* |
1354 | * OK, we are remounting a valid rw partition rdonly, so set | |
1355 | * the rdonly flag and then mark the partition as valid again. | |
1356 | */ | |
1357 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1358 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1359 | spin_unlock(&sbi->s_lock); |
c79d967d | 1360 | |
0f0dd62f CH |
1361 | err = dquot_suspend(sb, -1); |
1362 | if (err < 0) { | |
c79d967d CH |
1363 | spin_lock(&sbi->s_lock); |
1364 | goto restore_opts; | |
1365 | } | |
1366 | ||
4c96a68b | 1367 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1368 | } else { |
1369 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1370 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1371 | if (ret) { | |
2314b07c AF |
1372 | ext2_msg(sb, KERN_WARNING, |
1373 | "warning: couldn't remount RDWR because of " | |
1374 | "unsupported optional features (%x).", | |
1375 | le32_to_cpu(ret)); | |
50a52234 JK |
1376 | err = -EROFS; |
1377 | goto restore_opts; | |
1da177e4 LT |
1378 | } |
1379 | /* | |
1380 | * Mounting a RDONLY partition read-write, so reread and | |
1381 | * store the current valid flag. (It may have been changed | |
1382 | * by e2fsck since we originally mounted the partition.) | |
1383 | */ | |
1384 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1385 | if (!ext2_setup_super (sb, es, 0)) | |
1386 | sb->s_flags &= ~MS_RDONLY; | |
c15271f4 | 1387 | spin_unlock(&sbi->s_lock); |
c79d967d | 1388 | |
4c96a68b | 1389 | ext2_write_super(sb); |
c79d967d | 1390 | |
0f0dd62f | 1391 | dquot_resume(sb, -1); |
1da177e4 | 1392 | } |
c79d967d | 1393 | |
1da177e4 | 1394 | return 0; |
50a52234 JK |
1395 | restore_opts: |
1396 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1397 | sbi->s_resuid = old_opts.s_resuid; | |
1398 | sbi->s_resgid = old_opts.s_resgid; | |
1399 | sb->s_flags = old_sb_flags; | |
c15271f4 | 1400 | spin_unlock(&sbi->s_lock); |
50a52234 | 1401 | return err; |
1da177e4 LT |
1402 | } |
1403 | ||
726c3342 | 1404 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1405 | { |
726c3342 | 1406 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1407 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1408 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1409 | u64 fsid; |
1da177e4 | 1410 | |
c15271f4 JB |
1411 | spin_lock(&sbi->s_lock); |
1412 | ||
1da177e4 | 1413 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1414 | sbi->s_overhead_last = 0; |
1415 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1416 | unsigned long i, overhead = 0; | |
1417 | smp_rmb(); | |
1418 | ||
1da177e4 | 1419 | /* |
2235219b BP |
1420 | * Compute the overhead (FS structures). This is constant |
1421 | * for a given filesystem unless the number of block groups | |
1422 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1423 | */ |
1424 | ||
1425 | /* | |
1426 | * All of the blocks before first_data_block are | |
1427 | * overhead | |
1428 | */ | |
e4fca01e | 1429 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1430 | |
1431 | /* | |
1432 | * Add the overhead attributed to the superblock and | |
1433 | * block group descriptors. If the sparse superblocks | |
1434 | * feature is turned on, then not all groups have this. | |
1435 | */ | |
1436 | for (i = 0; i < sbi->s_groups_count; i++) | |
1437 | overhead += ext2_bg_has_super(sb, i) + | |
1438 | ext2_bg_num_gdb(sb, i); | |
1439 | ||
1440 | /* | |
1441 | * Every block group has an inode bitmap, a block | |
1442 | * bitmap, and an inode table. | |
1443 | */ | |
1444 | overhead += (sbi->s_groups_count * | |
1445 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1446 | sbi->s_overhead_last = overhead; |
1447 | smp_wmb(); | |
1448 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | buf->f_type = EXT2_SUPER_MAGIC; | |
1452 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1453 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1454 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1455 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1456 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1457 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1458 | buf->f_bavail = 0; |
e4fca01e PE |
1459 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1460 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1461 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1462 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1463 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1464 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1465 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1466 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1467 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1468 | return 0; |
1469 | } | |
1470 | ||
152a0836 AV |
1471 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1472 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1473 | { |
152a0836 | 1474 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1475 | } |
1476 | ||
1477 | #ifdef CONFIG_QUOTA | |
1478 | ||
1479 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1480 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1481 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1482 | * we don't have to be afraid of races */ |
1483 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1484 | size_t len, loff_t off) | |
1485 | { | |
1486 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1487 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1488 | int err = 0; | |
1489 | int offset = off & (sb->s_blocksize - 1); | |
1490 | int tocopy; | |
1491 | size_t toread; | |
1492 | struct buffer_head tmp_bh; | |
1493 | struct buffer_head *bh; | |
1494 | loff_t i_size = i_size_read(inode); | |
1495 | ||
1496 | if (off > i_size) | |
1497 | return 0; | |
1498 | if (off+len > i_size) | |
1499 | len = i_size-off; | |
1500 | toread = len; | |
1501 | while (toread > 0) { | |
1502 | tocopy = sb->s_blocksize - offset < toread ? | |
1503 | sb->s_blocksize - offset : toread; | |
1504 | ||
1505 | tmp_bh.b_state = 0; | |
c16831b4 | 1506 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1507 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1508 | if (err < 0) |
1da177e4 LT |
1509 | return err; |
1510 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1511 | memset(data, 0, tocopy); | |
1512 | else { | |
1513 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1514 | if (!bh) | |
1515 | return -EIO; | |
1516 | memcpy(data, bh->b_data+offset, tocopy); | |
1517 | brelse(bh); | |
1518 | } | |
1519 | offset = 0; | |
1520 | toread -= tocopy; | |
1521 | data += tocopy; | |
1522 | blk++; | |
1523 | } | |
1524 | return len; | |
1525 | } | |
1526 | ||
1527 | /* Write to quotafile */ | |
1528 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1529 | const char *data, size_t len, loff_t off) | |
1530 | { | |
1531 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1532 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1533 | int err = 0; | |
1534 | int offset = off & (sb->s_blocksize - 1); | |
1535 | int tocopy; | |
1536 | size_t towrite = len; | |
1537 | struct buffer_head tmp_bh; | |
1538 | struct buffer_head *bh; | |
1539 | ||
1da177e4 LT |
1540 | while (towrite > 0) { |
1541 | tocopy = sb->s_blocksize - offset < towrite ? | |
1542 | sb->s_blocksize - offset : towrite; | |
1543 | ||
1544 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1545 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1546 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1547 | if (err < 0) |
1da177e4 LT |
1548 | goto out; |
1549 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1550 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1551 | else | |
1552 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1553 | if (unlikely(!bh)) { |
1da177e4 LT |
1554 | err = -EIO; |
1555 | goto out; | |
1556 | } | |
1557 | lock_buffer(bh); | |
1558 | memcpy(bh->b_data+offset, data, tocopy); | |
1559 | flush_dcache_page(bh->b_page); | |
1560 | set_buffer_uptodate(bh); | |
1561 | mark_buffer_dirty(bh); | |
1562 | unlock_buffer(bh); | |
1563 | brelse(bh); | |
1564 | offset = 0; | |
1565 | towrite -= tocopy; | |
1566 | data += tocopy; | |
1567 | blk++; | |
1568 | } | |
1569 | out: | |
e2a3fde7 | 1570 | if (len == towrite) |
1da177e4 LT |
1571 | return err; |
1572 | if (inode->i_size < off+len-towrite) | |
1573 | i_size_write(inode, off+len-towrite); | |
1574 | inode->i_version++; | |
078cd827 | 1575 | inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4 | 1576 | mark_inode_dirty(inode); |
1da177e4 LT |
1577 | return len - towrite; |
1578 | } | |
1579 | ||
161f3b74 JK |
1580 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1581 | const struct path *path) | |
1582 | { | |
1583 | int err; | |
1584 | struct inode *inode; | |
1585 | ||
1586 | err = dquot_quota_on(sb, type, format_id, path); | |
1587 | if (err) | |
1588 | return err; | |
1589 | ||
1590 | inode = d_inode(path->dentry); | |
1591 | inode_lock(inode); | |
1592 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; | |
1593 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, | |
1594 | S_NOATIME | S_IMMUTABLE); | |
1595 | inode_unlock(inode); | |
1596 | mark_inode_dirty(inode); | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static int ext2_quota_off(struct super_block *sb, int type) | |
1602 | { | |
1603 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1604 | int err; | |
1605 | ||
1606 | if (!inode || !igrab(inode)) | |
1607 | goto out; | |
1608 | ||
1609 | err = dquot_quota_off(sb, type); | |
1610 | if (err) | |
1611 | goto out_put; | |
1612 | ||
1613 | inode_lock(inode); | |
1614 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); | |
1615 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); | |
1616 | inode_unlock(inode); | |
1617 | mark_inode_dirty(inode); | |
1618 | out_put: | |
1619 | iput(inode); | |
1620 | return err; | |
1621 | out: | |
1622 | return dquot_quota_off(sb, type); | |
1623 | } | |
1624 | ||
1da177e4 LT |
1625 | #endif |
1626 | ||
1627 | static struct file_system_type ext2_fs_type = { | |
1628 | .owner = THIS_MODULE, | |
1629 | .name = "ext2", | |
152a0836 | 1630 | .mount = ext2_mount, |
1da177e4 | 1631 | .kill_sb = kill_block_super, |
46b15caa | 1632 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 1633 | }; |
7f78e035 | 1634 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1635 | |
1636 | static int __init init_ext2_fs(void) | |
1637 | { | |
be0726d3 JK |
1638 | int err; |
1639 | ||
1da177e4 LT |
1640 | err = init_inodecache(); |
1641 | if (err) | |
be0726d3 | 1642 | return err; |
1da177e4 LT |
1643 | err = register_filesystem(&ext2_fs_type); |
1644 | if (err) | |
1645 | goto out; | |
1646 | return 0; | |
1647 | out: | |
1648 | destroy_inodecache(); | |
1da177e4 LT |
1649 | return err; |
1650 | } | |
1651 | ||
1652 | static void __exit exit_ext2_fs(void) | |
1653 | { | |
1654 | unregister_filesystem(&ext2_fs_type); | |
1655 | destroy_inodecache(); | |
1da177e4 LT |
1656 | } |
1657 | ||
302bf2f3 PG |
1658 | MODULE_AUTHOR("Remy Card and others"); |
1659 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1660 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1661 | module_init(init_ext2_fs) |
1662 | module_exit(exit_ext2_fs) |