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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> |
e1d747d9 | 36 | #include <linux/iversion.h> |
1da177e4 LT |
37 | #include "ext2.h" |
38 | #include "xattr.h" | |
39 | #include "acl.h" | |
40 | ||
65547661 | 41 | static void ext2_write_super(struct super_block *sb); |
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); |
1e8b212f JK |
45 | static int ext2_freeze(struct super_block *sb); |
46 | static int ext2_unfreeze(struct super_block *sb); | |
1da177e4 | 47 | |
23a2ad6d JP |
48 | void ext2_error(struct super_block *sb, const char *function, |
49 | const char *fmt, ...) | |
1da177e4 | 50 | { |
23a2ad6d | 51 | struct va_format vaf; |
1da177e4 LT |
52 | va_list args; |
53 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
54 | struct ext2_super_block *es = sbi->s_es; | |
55 | ||
bc98a42c | 56 | if (!sb_rdonly(sb)) { |
c15271f4 | 57 | spin_lock(&sbi->s_lock); |
1da177e4 | 58 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 59 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 60 | spin_unlock(&sbi->s_lock); |
ee6921eb | 61 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
62 | } |
63 | ||
64 | va_start(args, fmt); | |
23a2ad6d JP |
65 | |
66 | vaf.fmt = fmt; | |
67 | vaf.va = &args; | |
68 | ||
69 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", | |
70 | sb->s_id, function, &vaf); | |
71 | ||
1da177e4 LT |
72 | va_end(args); |
73 | ||
74 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 75 | panic("EXT2-fs: panic from previous error\n"); |
1da177e4 | 76 | if (test_opt(sb, ERRORS_RO)) { |
2314b07c OR |
77 | ext2_msg(sb, KERN_CRIT, |
78 | "error: remounting filesystem read-only"); | |
1751e8a6 | 79 | sb->s_flags |= SB_RDONLY; |
1da177e4 LT |
80 | } |
81 | } | |
82 | ||
2314b07c OR |
83 | void ext2_msg(struct super_block *sb, const char *prefix, |
84 | const char *fmt, ...) | |
1da177e4 | 85 | { |
23a2ad6d | 86 | struct va_format vaf; |
1da177e4 LT |
87 | va_list args; |
88 | ||
89 | va_start(args, fmt); | |
23a2ad6d JP |
90 | |
91 | vaf.fmt = fmt; | |
92 | vaf.va = &args; | |
93 | ||
94 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); | |
95 | ||
1da177e4 LT |
96 | va_end(args); |
97 | } | |
98 | ||
c15271f4 JB |
99 | /* |
100 | * This must be called with sbi->s_lock held. | |
101 | */ | |
1da177e4 LT |
102 | void ext2_update_dynamic_rev(struct super_block *sb) |
103 | { | |
104 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
105 | ||
106 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
107 | return; | |
108 | ||
2314b07c OR |
109 | ext2_msg(sb, KERN_WARNING, |
110 | "warning: updating to rev %d because of " | |
111 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
112 | EXT2_DYNAMIC_REV); |
113 | ||
114 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
115 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
116 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
117 | /* leave es->s_feature_*compat flags alone */ | |
118 | /* es->s_uuid will be set by e2fsck if empty */ | |
119 | ||
120 | /* | |
121 | * The rest of the superblock fields should be zero, and if not it | |
122 | * means they are likely already in use, so leave them alone. We | |
123 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
124 | */ | |
125 | } | |
126 | ||
161f3b74 JK |
127 | #ifdef CONFIG_QUOTA |
128 | static int ext2_quota_off(struct super_block *sb, int type); | |
129 | ||
130 | static void ext2_quota_off_umount(struct super_block *sb) | |
131 | { | |
132 | int type; | |
133 | ||
134 | for (type = 0; type < MAXQUOTAS; type++) | |
135 | ext2_quota_off(sb, type); | |
136 | } | |
137 | #else | |
138 | static inline void ext2_quota_off_umount(struct super_block *sb) | |
139 | { | |
140 | } | |
141 | #endif | |
142 | ||
1da177e4 LT |
143 | static void ext2_put_super (struct super_block * sb) |
144 | { | |
145 | int db_count; | |
146 | int i; | |
147 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
148 | ||
161f3b74 | 149 | ext2_quota_off_umount(sb); |
e0ccfd95 | 150 | |
47387409 TE |
151 | if (sbi->s_ea_block_cache) { |
152 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); | |
153 | sbi->s_ea_block_cache = NULL; | |
be0726d3 | 154 | } |
bc98a42c | 155 | if (!sb_rdonly(sb)) { |
1da177e4 LT |
156 | struct ext2_super_block *es = sbi->s_es; |
157 | ||
c15271f4 | 158 | spin_lock(&sbi->s_lock); |
1da177e4 | 159 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 160 | spin_unlock(&sbi->s_lock); |
ee6921eb | 161 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
162 | } |
163 | db_count = sbi->s_gdb_count; | |
164 | for (i = 0; i < db_count; i++) | |
165 | if (sbi->s_group_desc[i]) | |
166 | brelse (sbi->s_group_desc[i]); | |
167 | kfree(sbi->s_group_desc); | |
168 | kfree(sbi->s_debts); | |
169 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
170 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
171 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
172 | brelse (sbi->s_sbh); | |
173 | sb->s_fs_info = NULL; | |
18a82eb9 | 174 | kfree(sbi->s_blockgroup_lock); |
8cf037a8 | 175 | fs_put_dax(sbi->s_daxdev); |
1da177e4 | 176 | kfree(sbi); |
1da177e4 LT |
177 | } |
178 | ||
e18b890b | 179 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
180 | |
181 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
182 | { | |
183 | struct ext2_inode_info *ei; | |
e625b310 | 184 | ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
185 | if (!ei) |
186 | return NULL; | |
a686cd89 | 187 | ei->i_block_alloc_info = NULL; |
e1d747d9 | 188 | inode_set_iversion(&ei->vfs_inode, 1); |
64241118 JK |
189 | #ifdef CONFIG_QUOTA |
190 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); | |
191 | #endif | |
192 | ||
1da177e4 LT |
193 | return &ei->vfs_inode; |
194 | } | |
195 | ||
fa0d7e3d | 196 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 197 | { |
fa0d7e3d | 198 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
199 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
200 | } | |
201 | ||
fa0d7e3d NP |
202 | static void ext2_destroy_inode(struct inode *inode) |
203 | { | |
204 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
205 | } | |
206 | ||
51cc5068 | 207 | static void init_once(void *foo) |
1da177e4 LT |
208 | { |
209 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
210 | ||
a35afb83 | 211 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 212 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 213 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 214 | #endif |
a686cd89 | 215 | mutex_init(&ei->truncate_mutex); |
5726b27b RZ |
216 | #ifdef CONFIG_FS_DAX |
217 | init_rwsem(&ei->dax_sem); | |
218 | #endif | |
a35afb83 | 219 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 220 | } |
20c2df83 | 221 | |
0903353a | 222 | static int __init init_inodecache(void) |
1da177e4 LT |
223 | { |
224 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
225 | sizeof(struct ext2_inode_info), | |
fffb60f9 | 226 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 227 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 228 | init_once); |
1da177e4 LT |
229 | if (ext2_inode_cachep == NULL) |
230 | return -ENOMEM; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static void destroy_inodecache(void) | |
235 | { | |
8c0a8537 KS |
236 | /* |
237 | * Make sure all delayed rcu free inodes are flushed before we | |
238 | * destroy cache. | |
239 | */ | |
240 | rcu_barrier(); | |
1a1d92c1 | 241 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
242 | } |
243 | ||
34c80b1d | 244 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
8fc2751b | 245 | { |
34c80b1d | 246 | struct super_block *sb = root->d_sb; |
93d44cb2 MS |
247 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
248 | struct ext2_super_block *es = sbi->s_es; | |
249 | unsigned long def_mount_opts; | |
8fc2751b | 250 | |
c15271f4 | 251 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
252 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
253 | ||
254 | if (sbi->s_sb_block != 1) | |
255 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
256 | if (test_opt(sb, MINIX_DF)) | |
257 | seq_puts(seq, ",minixdf"); | |
258 | if (test_opt(sb, GRPID)) | |
8fc2751b | 259 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
260 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
261 | seq_puts(seq, ",nogrpid"); | |
b8a9f9e1 | 262 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
93d44cb2 | 263 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
b8a9f9e1 EB |
264 | seq_printf(seq, ",resuid=%u", |
265 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); | |
93d44cb2 | 266 | } |
b8a9f9e1 | 267 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
93d44cb2 | 268 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
b8a9f9e1 EB |
269 | seq_printf(seq, ",resgid=%u", |
270 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); | |
93d44cb2 | 271 | } |
14e11e10 | 272 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
273 | int def_errors = le16_to_cpu(es->s_errors); |
274 | ||
275 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
276 | def_errors == EXT2_ERRORS_CONTINUE) { |
277 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
278 | } |
279 | } | |
14e11e10 AK |
280 | if (test_opt(sb, ERRORS_CONT)) |
281 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
282 | if (test_opt(sb, ERRORS_PANIC)) |
283 | seq_puts(seq, ",errors=panic"); | |
284 | if (test_opt(sb, NO_UID32)) | |
285 | seq_puts(seq, ",nouid32"); | |
286 | if (test_opt(sb, DEBUG)) | |
287 | seq_puts(seq, ",debug"); | |
288 | if (test_opt(sb, OLDALLOC)) | |
289 | seq_puts(seq, ",oldalloc"); | |
290 | ||
291 | #ifdef CONFIG_EXT2_FS_XATTR | |
292 | if (test_opt(sb, XATTR_USER)) | |
293 | seq_puts(seq, ",user_xattr"); | |
294 | if (!test_opt(sb, XATTR_USER) && | |
295 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
296 | seq_puts(seq, ",nouser_xattr"); | |
297 | } | |
298 | #endif | |
299 | ||
300 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
301 | if (test_opt(sb, POSIX_ACL)) | |
302 | seq_puts(seq, ",acl"); | |
303 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
304 | seq_puts(seq, ",noacl"); | |
305 | #endif | |
306 | ||
307 | if (test_opt(sb, NOBH)) | |
308 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
309 | |
310 | #if defined(CONFIG_QUOTA) | |
311 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
312 | seq_puts(seq, ",usrquota"); | |
313 | ||
314 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
315 | seq_puts(seq, ",grpquota"); | |
316 | #endif | |
317 | ||
6cd176a5 | 318 | #ifdef CONFIG_FS_DAX |
83541796 CO |
319 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) |
320 | seq_puts(seq, ",xip"); | |
9c3ce9ec MW |
321 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) |
322 | seq_puts(seq, ",dax"); | |
83541796 CO |
323 | #endif |
324 | ||
35c879dc MS |
325 | if (!test_opt(sb, RESERVATION)) |
326 | seq_puts(seq, ",noreservation"); | |
327 | ||
c15271f4 | 328 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
329 | return 0; |
330 | } | |
331 | ||
1da177e4 LT |
332 | #ifdef CONFIG_QUOTA |
333 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
334 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
161f3b74 JK |
335 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
336 | const struct path *path); | |
64241118 JK |
337 | static struct dquot **ext2_get_dquots(struct inode *inode) |
338 | { | |
339 | return EXT2_I(inode)->i_dquot; | |
340 | } | |
161f3b74 JK |
341 | |
342 | static const struct quotactl_ops ext2_quotactl_ops = { | |
343 | .quota_on = ext2_quota_on, | |
344 | .quota_off = ext2_quota_off, | |
345 | .quota_sync = dquot_quota_sync, | |
346 | .get_state = dquot_get_state, | |
347 | .set_info = dquot_set_dqinfo, | |
348 | .get_dqblk = dquot_get_dqblk, | |
349 | .set_dqblk = dquot_set_dqblk, | |
350 | .get_nextdqblk = dquot_get_next_dqblk, | |
351 | }; | |
1da177e4 LT |
352 | #endif |
353 | ||
ee9b6d61 | 354 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
355 | .alloc_inode = ext2_alloc_inode, |
356 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 357 | .write_inode = ext2_write_inode, |
72edc4d0 | 358 | .evict_inode = ext2_evict_inode, |
1da177e4 | 359 | .put_super = ext2_put_super, |
40f31dd4 | 360 | .sync_fs = ext2_sync_fs, |
1e8b212f JK |
361 | .freeze_fs = ext2_freeze, |
362 | .unfreeze_fs = ext2_unfreeze, | |
1da177e4 LT |
363 | .statfs = ext2_statfs, |
364 | .remount_fs = ext2_remount, | |
8fc2751b | 365 | .show_options = ext2_show_options, |
1da177e4 LT |
366 | #ifdef CONFIG_QUOTA |
367 | .quota_read = ext2_quota_read, | |
368 | .quota_write = ext2_quota_write, | |
64241118 | 369 | .get_dquots = ext2_get_dquots, |
1da177e4 LT |
370 | #endif |
371 | }; | |
372 | ||
2e4c68e3 CH |
373 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
374 | u64 ino, u32 generation) | |
ecaff756 | 375 | { |
ecaff756 | 376 | struct inode *inode; |
ecaff756 N |
377 | |
378 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
379 | return ERR_PTR(-ESTALE); | |
380 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
381 | return ERR_PTR(-ESTALE); | |
382 | ||
f32948dd LH |
383 | /* |
384 | * ext2_iget isn't quite right if the inode is currently unallocated! | |
385 | * However ext2_iget currently does appropriate checks to handle stale | |
386 | * inodes so everything is OK. | |
ecaff756 | 387 | */ |
52fcf703 DH |
388 | inode = ext2_iget(sb, ino); |
389 | if (IS_ERR(inode)) | |
390 | return ERR_CAST(inode); | |
391 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
392 | /* we didn't find the right inode.. */ |
393 | iput(inode); | |
394 | return ERR_PTR(-ESTALE); | |
395 | } | |
2e4c68e3 CH |
396 | return inode; |
397 | } | |
398 | ||
399 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
400 | int fh_len, int fh_type) | |
401 | { | |
402 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
403 | ext2_nfs_get_inode); | |
404 | } | |
405 | ||
406 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
407 | int fh_len, int fh_type) | |
408 | { | |
409 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
410 | ext2_nfs_get_inode); | |
ecaff756 N |
411 | } |
412 | ||
39655164 | 413 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
414 | .fh_to_dentry = ext2_fh_to_dentry, |
415 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
416 | .get_parent = ext2_get_parent, |
417 | }; | |
418 | ||
419 | static unsigned long get_sb_block(void **data) | |
420 | { | |
421 | unsigned long sb_block; | |
422 | char *options = (char *) *data; | |
423 | ||
424 | if (!options || strncmp(options, "sb=", 3) != 0) | |
425 | return 1; /* Default location */ | |
426 | options += 3; | |
427 | sb_block = simple_strtoul(options, &options, 0); | |
428 | if (*options && *options != ',') { | |
429 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
430 | (char *) *data); | |
431 | return 1; | |
432 | } | |
433 | if (*options == ',') | |
434 | options++; | |
435 | *data = (void *) options; | |
436 | return sb_block; | |
437 | } | |
438 | ||
439 | enum { | |
440 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 441 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 442 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b | 443 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
9c3ce9ec | 444 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
a686cd89 | 445 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
446 | }; |
447 | ||
a447c093 | 448 | static const match_table_t tokens = { |
1da177e4 LT |
449 | {Opt_bsd_df, "bsddf"}, |
450 | {Opt_minix_df, "minixdf"}, | |
451 | {Opt_grpid, "grpid"}, | |
452 | {Opt_grpid, "bsdgroups"}, | |
453 | {Opt_nogrpid, "nogrpid"}, | |
454 | {Opt_nogrpid, "sysvgroups"}, | |
455 | {Opt_resgid, "resgid=%u"}, | |
456 | {Opt_resuid, "resuid=%u"}, | |
457 | {Opt_sb, "sb=%u"}, | |
458 | {Opt_err_cont, "errors=continue"}, | |
459 | {Opt_err_panic, "errors=panic"}, | |
460 | {Opt_err_ro, "errors=remount-ro"}, | |
461 | {Opt_nouid32, "nouid32"}, | |
462 | {Opt_nocheck, "check=none"}, | |
463 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
464 | {Opt_debug, "debug"}, |
465 | {Opt_oldalloc, "oldalloc"}, | |
466 | {Opt_orlov, "orlov"}, | |
467 | {Opt_nobh, "nobh"}, | |
468 | {Opt_user_xattr, "user_xattr"}, | |
469 | {Opt_nouser_xattr, "nouser_xattr"}, | |
470 | {Opt_acl, "acl"}, | |
471 | {Opt_noacl, "noacl"}, | |
6d79125b | 472 | {Opt_xip, "xip"}, |
9c3ce9ec | 473 | {Opt_dax, "dax"}, |
8fc2751b | 474 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 475 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
476 | {Opt_quota, "quota"}, |
477 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
478 | {Opt_reservation, "reservation"}, |
479 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
480 | {Opt_err, NULL} |
481 | }; | |
482 | ||
08851957 JK |
483 | static int parse_options(char *options, struct super_block *sb, |
484 | struct ext2_mount_options *opts) | |
1da177e4 | 485 | { |
2314b07c | 486 | char *p; |
1da177e4 | 487 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 | 488 | int option; |
b8a9f9e1 EB |
489 | kuid_t uid; |
490 | kgid_t gid; | |
1da177e4 LT |
491 | |
492 | if (!options) | |
493 | return 1; | |
494 | ||
495 | while ((p = strsep (&options, ",")) != NULL) { | |
496 | int token; | |
497 | if (!*p) | |
498 | continue; | |
499 | ||
500 | token = match_token(p, tokens, args); | |
501 | switch (token) { | |
502 | case Opt_bsd_df: | |
08851957 | 503 | clear_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
504 | break; |
505 | case Opt_minix_df: | |
08851957 | 506 | set_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
507 | break; |
508 | case Opt_grpid: | |
08851957 | 509 | set_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
510 | break; |
511 | case Opt_nogrpid: | |
08851957 | 512 | clear_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
513 | break; |
514 | case Opt_resuid: | |
515 | if (match_int(&args[0], &option)) | |
516 | return 0; | |
b8a9f9e1 EB |
517 | uid = make_kuid(current_user_ns(), option); |
518 | if (!uid_valid(uid)) { | |
519 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); | |
ae2cf428 | 520 | return 0; |
b8a9f9e1 EB |
521 | |
522 | } | |
08851957 | 523 | opts->s_resuid = uid; |
1da177e4 LT |
524 | break; |
525 | case Opt_resgid: | |
526 | if (match_int(&args[0], &option)) | |
527 | return 0; | |
b8a9f9e1 EB |
528 | gid = make_kgid(current_user_ns(), option); |
529 | if (!gid_valid(gid)) { | |
530 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); | |
ae2cf428 | 531 | return 0; |
b8a9f9e1 | 532 | } |
08851957 | 533 | opts->s_resgid = gid; |
1da177e4 LT |
534 | break; |
535 | case Opt_sb: | |
536 | /* handled by get_sb_block() instead of here */ | |
537 | /* *sb_block = match_int(&args[0]); */ | |
538 | break; | |
539 | case Opt_err_panic: | |
08851957 JK |
540 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
541 | clear_opt (opts->s_mount_opt, ERRORS_RO); | |
542 | set_opt (opts->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
543 | break; |
544 | case Opt_err_ro: | |
08851957 JK |
545 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
546 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
547 | set_opt (opts->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
548 | break; |
549 | case Opt_err_cont: | |
08851957 JK |
550 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
551 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
552 | set_opt (opts->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
553 | break; |
554 | case Opt_nouid32: | |
08851957 | 555 | set_opt (opts->s_mount_opt, NO_UID32); |
1da177e4 | 556 | break; |
1da177e4 | 557 | case Opt_nocheck: |
08851957 | 558 | clear_opt (opts->s_mount_opt, CHECK); |
1da177e4 LT |
559 | break; |
560 | case Opt_debug: | |
08851957 | 561 | set_opt (opts->s_mount_opt, DEBUG); |
1da177e4 LT |
562 | break; |
563 | case Opt_oldalloc: | |
08851957 | 564 | set_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
565 | break; |
566 | case Opt_orlov: | |
08851957 | 567 | clear_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
568 | break; |
569 | case Opt_nobh: | |
08851957 | 570 | set_opt (opts->s_mount_opt, NOBH); |
1da177e4 LT |
571 | break; |
572 | #ifdef CONFIG_EXT2_FS_XATTR | |
573 | case Opt_user_xattr: | |
08851957 | 574 | set_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
575 | break; |
576 | case Opt_nouser_xattr: | |
08851957 | 577 | clear_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
578 | break; |
579 | #else | |
580 | case Opt_user_xattr: | |
581 | case Opt_nouser_xattr: | |
2314b07c OR |
582 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
583 | "not supported"); | |
1da177e4 LT |
584 | break; |
585 | #endif | |
586 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
587 | case Opt_acl: | |
08851957 | 588 | set_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
589 | break; |
590 | case Opt_noacl: | |
08851957 | 591 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
592 | break; |
593 | #else | |
594 | case Opt_acl: | |
595 | case Opt_noacl: | |
2314b07c OR |
596 | ext2_msg(sb, KERN_INFO, |
597 | "(no)acl options not supported"); | |
1da177e4 LT |
598 | break; |
599 | #endif | |
6d79125b | 600 | case Opt_xip: |
9c3ce9ec | 601 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
08851957 | 602 | set_opt(opts->s_mount_opt, XIP); |
9c3ce9ec MW |
603 | /* Fall through */ |
604 | case Opt_dax: | |
6cd176a5 | 605 | #ifdef CONFIG_FS_DAX |
ef83b6e8 DW |
606 | ext2_msg(sb, KERN_WARNING, |
607 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); | |
08851957 | 608 | set_opt(opts->s_mount_opt, DAX); |
6d79125b | 609 | #else |
9c3ce9ec | 610 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
6d79125b CO |
611 | #endif |
612 | break; | |
8fc2751b MB |
613 | |
614 | #if defined(CONFIG_QUOTA) | |
615 | case Opt_quota: | |
616 | case Opt_usrquota: | |
08851957 | 617 | set_opt(opts->s_mount_opt, USRQUOTA); |
8fc2751b MB |
618 | break; |
619 | ||
620 | case Opt_grpquota: | |
08851957 | 621 | set_opt(opts->s_mount_opt, GRPQUOTA); |
8fc2751b MB |
622 | break; |
623 | #else | |
624 | case Opt_quota: | |
625 | case Opt_usrquota: | |
626 | case Opt_grpquota: | |
2314b07c OR |
627 | ext2_msg(sb, KERN_INFO, |
628 | "quota operations not supported"); | |
8fc2751b MB |
629 | break; |
630 | #endif | |
631 | ||
a686cd89 | 632 | case Opt_reservation: |
08851957 | 633 | set_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 634 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
635 | break; |
636 | case Opt_noreservation: | |
08851957 | 637 | clear_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 638 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 639 | break; |
1da177e4 LT |
640 | case Opt_ignore: |
641 | break; | |
642 | default: | |
643 | return 0; | |
644 | } | |
645 | } | |
1da177e4 LT |
646 | return 1; |
647 | } | |
648 | ||
649 | static int ext2_setup_super (struct super_block * sb, | |
650 | struct ext2_super_block * es, | |
651 | int read_only) | |
652 | { | |
653 | int res = 0; | |
654 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
655 | ||
656 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c OR |
657 | ext2_msg(sb, KERN_ERR, |
658 | "error: revision level too high, " | |
659 | "forcing read-only mode"); | |
1751e8a6 | 660 | res = SB_RDONLY; |
1da177e4 LT |
661 | } |
662 | if (read_only) | |
663 | return res; | |
664 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c OR |
665 | ext2_msg(sb, KERN_WARNING, |
666 | "warning: mounting unchecked fs, " | |
667 | "running e2fsck is recommended"); | |
1da177e4 | 668 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c OR |
669 | ext2_msg(sb, KERN_WARNING, |
670 | "warning: mounting fs with errors, " | |
671 | "running e2fsck is recommended"); | |
1da177e4 LT |
672 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
673 | le16_to_cpu(es->s_mnt_count) >= | |
674 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c OR |
675 | ext2_msg(sb, KERN_WARNING, |
676 | "warning: maximal mount count reached, " | |
677 | "running e2fsck is recommended"); | |
1da177e4 | 678 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c OR |
679 | (le32_to_cpu(es->s_lastcheck) + |
680 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
681 | ext2_msg(sb, KERN_WARNING, | |
682 | "warning: checktime reached, " | |
683 | "running e2fsck is recommended"); | |
1da177e4 LT |
684 | if (!le16_to_cpu(es->s_max_mnt_count)) |
685 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 686 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 687 | if (test_opt (sb, DEBUG)) |
2314b07c OR |
688 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
689 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
690 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
691 | sbi->s_frag_size, | |
692 | sbi->s_groups_count, | |
693 | EXT2_BLOCKS_PER_GROUP(sb), | |
694 | EXT2_INODES_PER_GROUP(sb), | |
695 | sbi->s_mount_opt); | |
1da177e4 LT |
696 | return res; |
697 | } | |
698 | ||
197cd65a | 699 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
700 | { |
701 | int i; | |
1da177e4 | 702 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
703 | |
704 | ext2_debug ("Checking group descriptors"); | |
705 | ||
197cd65a AM |
706 | for (i = 0; i < sbi->s_groups_count; i++) { |
707 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
708 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
709 | ext2_fsblk_t last_block; | |
197cd65a | 710 | |
41f04d85 ES |
711 | if (i == sbi->s_groups_count - 1) |
712 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
713 | else | |
714 | last_block = first_block + | |
715 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
716 | ||
41f04d85 ES |
717 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
718 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
719 | { |
720 | ext2_error (sb, "ext2_check_descriptors", | |
721 | "Block bitmap for group %d" | |
722 | " not in group (block %lu)!", | |
723 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
724 | return 0; | |
725 | } | |
41f04d85 ES |
726 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
727 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
728 | { |
729 | ext2_error (sb, "ext2_check_descriptors", | |
730 | "Inode bitmap for group %d" | |
731 | " not in group (block %lu)!", | |
732 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
733 | return 0; | |
734 | } | |
41f04d85 | 735 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 736 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 737 | last_block) |
1da177e4 LT |
738 | { |
739 | ext2_error (sb, "ext2_check_descriptors", | |
740 | "Inode table for group %d" | |
741 | " not in group (block %lu)!", | |
742 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
743 | return 0; | |
744 | } | |
1da177e4 LT |
745 | } |
746 | return 1; | |
747 | } | |
748 | ||
1da177e4 LT |
749 | /* |
750 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
751 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
752 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
753 | */ | |
754 | static loff_t ext2_max_size(int bits) | |
755 | { | |
756 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
757 | int meta_blocks; |
758 | loff_t upper_limit; | |
759 | ||
760 | /* This is calculated to be the largest file size for a | |
761 | * dense, file such that the total number of | |
1da177e4 | 762 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
763 | * does not exceed 2^32 -1 |
764 | * __u32 i_blocks representing the total number of | |
765 | * 512 bytes blocks of the file | |
766 | */ | |
767 | upper_limit = (1LL << 32) - 1; | |
768 | ||
769 | /* total blocks in file system block size */ | |
770 | upper_limit >>= (bits - 9); | |
771 | ||
772 | ||
773 | /* indirect blocks */ | |
774 | meta_blocks = 1; | |
775 | /* double indirect blocks */ | |
776 | meta_blocks += 1 + (1LL << (bits-2)); | |
777 | /* tripple indirect blocks */ | |
778 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
779 | ||
780 | upper_limit -= meta_blocks; | |
781 | upper_limit <<= bits; | |
1da177e4 LT |
782 | |
783 | res += 1LL << (bits-2); | |
784 | res += 1LL << (2*(bits-2)); | |
785 | res += 1LL << (3*(bits-2)); | |
786 | res <<= bits; | |
787 | if (res > upper_limit) | |
788 | res = upper_limit; | |
902be4c5 AK |
789 | |
790 | if (res > MAX_LFS_FILESIZE) | |
791 | res = MAX_LFS_FILESIZE; | |
792 | ||
1da177e4 LT |
793 | return res; |
794 | } | |
795 | ||
796 | static unsigned long descriptor_loc(struct super_block *sb, | |
797 | unsigned long logic_sb_block, | |
798 | int nr) | |
799 | { | |
800 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 801 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
802 | int has_super = 0; |
803 | ||
1da177e4 LT |
804 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
805 | ||
806 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
807 | nr < first_meta_bg) | |
808 | return (logic_sb_block + nr + 1); | |
809 | bg = sbi->s_desc_per_block * nr; | |
810 | if (ext2_bg_has_super(sb, bg)) | |
811 | has_super = 1; | |
24097d12 AM |
812 | |
813 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
814 | } |
815 | ||
816 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
817 | { | |
8cf037a8 | 818 | struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
1da177e4 LT |
819 | struct buffer_head * bh; |
820 | struct ext2_sb_info * sbi; | |
821 | struct ext2_super_block * es; | |
822 | struct inode *root; | |
823 | unsigned long block; | |
824 | unsigned long sb_block = get_sb_block(&data); | |
825 | unsigned long logic_sb_block; | |
826 | unsigned long offset = 0; | |
827 | unsigned long def_mount_opts; | |
52fcf703 | 828 | long ret = -EINVAL; |
1da177e4 LT |
829 | int blocksize = BLOCK_SIZE; |
830 | int db_count; | |
831 | int i, j; | |
832 | __le32 features; | |
833f4077 | 833 | int err; |
08851957 | 834 | struct ext2_mount_options opts; |
1da177e4 | 835 | |
db719222 | 836 | err = -ENOMEM; |
f8314dc6 | 837 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 838 | if (!sbi) |
e124a320 | 839 | goto failed; |
18a82eb9 PE |
840 | |
841 | sbi->s_blockgroup_lock = | |
842 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
843 | if (!sbi->s_blockgroup_lock) { | |
844 | kfree(sbi); | |
e124a320 | 845 | goto failed; |
18a82eb9 | 846 | } |
1da177e4 | 847 | sb->s_fs_info = sbi; |
93d44cb2 | 848 | sbi->s_sb_block = sb_block; |
8cf037a8 | 849 | sbi->s_daxdev = dax_dev; |
1da177e4 | 850 | |
c15271f4 JB |
851 | spin_lock_init(&sbi->s_lock); |
852 | ||
1da177e4 LT |
853 | /* |
854 | * See what the current blocksize for the device is, and | |
855 | * use that as the blocksize. Otherwise (or if the blocksize | |
856 | * is smaller than the default) use the default. | |
857 | * This is important for devices that have a hardware | |
858 | * sectorsize that is larger than the default. | |
859 | */ | |
860 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
861 | if (!blocksize) { | |
2314b07c | 862 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
863 | goto failed_sbi; |
864 | } | |
865 | ||
866 | /* | |
867 | * If the superblock doesn't start on a hardware sector boundary, | |
868 | * calculate the offset. | |
869 | */ | |
870 | if (blocksize != BLOCK_SIZE) { | |
871 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
872 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
873 | } else { | |
874 | logic_sb_block = sb_block; | |
875 | } | |
876 | ||
877 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 878 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
879 | goto failed_sbi; |
880 | } | |
881 | /* | |
882 | * Note: s_es must be initialized as soon as possible because | |
883 | * some ext2 macro-instructions depend on its value | |
884 | */ | |
885 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
886 | sbi->s_es = es; | |
887 | sb->s_magic = le16_to_cpu(es->s_magic); | |
888 | ||
889 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
890 | goto cantfind_ext2; | |
891 | ||
892 | /* Set defaults before we parse the mount options */ | |
893 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
894 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
08851957 | 895 | set_opt(opts.s_mount_opt, DEBUG); |
1da177e4 | 896 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
08851957 | 897 | set_opt(opts.s_mount_opt, GRPID); |
1da177e4 | 898 | if (def_mount_opts & EXT2_DEFM_UID16) |
08851957 | 899 | set_opt(opts.s_mount_opt, NO_UID32); |
2e7842b8 | 900 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 | 901 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
08851957 | 902 | set_opt(opts.s_mount_opt, XATTR_USER); |
2e7842b8 HD |
903 | #endif |
904 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 | 905 | if (def_mount_opts & EXT2_DEFM_ACL) |
08851957 | 906 | set_opt(opts.s_mount_opt, POSIX_ACL); |
2e7842b8 | 907 | #endif |
1da177e4 LT |
908 | |
909 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
08851957 | 910 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
14e11e10 | 911 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
08851957 | 912 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
14e11e10 | 913 | else |
08851957 | 914 | set_opt(opts.s_mount_opt, ERRORS_RO); |
1da177e4 | 915 | |
08851957 JK |
916 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
917 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 918 | |
08851957 | 919 | set_opt(opts.s_mount_opt, RESERVATION); |
a686cd89 | 920 | |
08851957 | 921 | if (!parse_options((char *) data, sb, &opts)) |
1da177e4 LT |
922 | goto failed_mount; |
923 | ||
08851957 JK |
924 | sbi->s_mount_opt = opts.s_mount_opt; |
925 | sbi->s_resuid = opts.s_resuid; | |
926 | sbi->s_resgid = opts.s_resgid; | |
927 | ||
1751e8a6 | 928 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1da177e4 | 929 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
1751e8a6 | 930 | SB_POSIXACL : 0); |
46b15caa | 931 | sb->s_iflags |= SB_I_CGROUPWB; |
1da177e4 LT |
932 | |
933 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
934 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
935 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
936 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c OR |
937 | ext2_msg(sb, KERN_WARNING, |
938 | "warning: feature flags set on rev 0 fs, " | |
939 | "running e2fsck is recommended"); | |
1da177e4 LT |
940 | /* |
941 | * Check feature flags regardless of the revision level, since we | |
942 | * previously didn't change the revision level when setting the flags, | |
943 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
944 | */ | |
945 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
946 | if (features) { | |
2314b07c OR |
947 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
948 | "unsupported optional features (%x)", | |
949 | le32_to_cpu(features)); | |
1da177e4 LT |
950 | goto failed_mount; |
951 | } | |
bc98a42c | 952 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
2314b07c OR |
953 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
954 | "unsupported optional features (%x)", | |
955 | le32_to_cpu(features)); | |
1da177e4 LT |
956 | goto failed_mount; |
957 | } | |
958 | ||
959 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
960 | ||
9c3ce9ec | 961 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { |
284854be TK |
962 | err = bdev_dax_supported(sb, blocksize); |
963 | if (err) | |
0de4830f | 964 | goto failed_mount; |
6d79125b CO |
965 | } |
966 | ||
1da177e4 LT |
967 | /* If the blocksize doesn't match, re-read the thing.. */ |
968 | if (sb->s_blocksize != blocksize) { | |
969 | brelse(bh); | |
970 | ||
971 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
972 | ext2_msg(sb, KERN_ERR, |
973 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
974 | goto failed_sbi; |
975 | } | |
976 | ||
977 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
978 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
979 | bh = sb_bread(sb, logic_sb_block); | |
980 | if(!bh) { | |
2314b07c OR |
981 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
982 | "superblock on 2nd try"); | |
1da177e4 LT |
983 | goto failed_sbi; |
984 | } | |
985 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
986 | sbi->s_es = es; | |
987 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 988 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
989 | goto failed_mount; |
990 | } | |
991 | } | |
992 | ||
993 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 994 | sb->s_max_links = EXT2_LINK_MAX; |
1da177e4 LT |
995 | |
996 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
997 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
998 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
999 | } else { | |
1000 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1001 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
1002 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 1003 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 1004 | (sbi->s_inode_size > blocksize)) { |
2314b07c OR |
1005 | ext2_msg(sb, KERN_ERR, |
1006 | "error: unsupported inode size: %d", | |
1da177e4 LT |
1007 | sbi->s_inode_size); |
1008 | goto failed_mount; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
1013 | le32_to_cpu(es->s_log_frag_size); | |
1014 | if (sbi->s_frag_size == 0) | |
1015 | goto cantfind_ext2; | |
1016 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
1017 | ||
1018 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1019 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1020 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1021 | ||
1022 | if (EXT2_INODE_SIZE(sb) == 0) | |
1023 | goto cantfind_ext2; | |
1024 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 1025 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
1026 | goto cantfind_ext2; |
1027 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1028 | sbi->s_inodes_per_block; | |
1029 | sbi->s_desc_per_block = sb->s_blocksize / | |
1030 | sizeof (struct ext2_group_desc); | |
1031 | sbi->s_sbh = bh; | |
1032 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1033 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 1034 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 1035 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 1036 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
1037 | |
1038 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
1039 | goto cantfind_ext2; | |
1040 | ||
1041 | if (sb->s_blocksize != bh->b_size) { | |
1042 | if (!silent) | |
2314b07c | 1043 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
1044 | goto failed_mount; |
1045 | } | |
1046 | ||
1047 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c OR |
1048 | ext2_msg(sb, KERN_ERR, |
1049 | "error: fragsize %lu != blocksize %lu" | |
1050 | "(not supported yet)", | |
1da177e4 LT |
1051 | sbi->s_frag_size, sb->s_blocksize); |
1052 | goto failed_mount; | |
1053 | } | |
1054 | ||
1055 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1056 | ext2_msg(sb, KERN_ERR, |
1057 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1058 | sbi->s_blocks_per_group); |
1059 | goto failed_mount; | |
1060 | } | |
1061 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1062 | ext2_msg(sb, KERN_ERR, |
1063 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1064 | sbi->s_frags_per_group); |
1065 | goto failed_mount; | |
1066 | } | |
1067 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1068 | ext2_msg(sb, KERN_ERR, |
1069 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1070 | sbi->s_inodes_per_group); |
1071 | goto failed_mount; | |
1072 | } | |
1073 | ||
1074 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1075 | goto cantfind_ext2; | |
41f04d85 ES |
1076 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1077 | le32_to_cpu(es->s_first_data_block) - 1) | |
1078 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1079 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1080 | EXT2_DESC_PER_BLOCK(sb); | |
1081 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1082 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1083 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1084 | goto failed_mount; |
1085 | } | |
18a82eb9 | 1086 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1087 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1088 | if (!sbi->s_debts) { |
2314b07c | 1089 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1090 | goto failed_mount_group_desc; |
1091 | } | |
1da177e4 LT |
1092 | for (i = 0; i < db_count; i++) { |
1093 | block = descriptor_loc(sb, logic_sb_block, i); | |
1094 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1095 | if (!sbi->s_group_desc[i]) { | |
1096 | for (j = 0; j < i; j++) | |
1097 | brelse (sbi->s_group_desc[j]); | |
2314b07c OR |
1098 | ext2_msg(sb, KERN_ERR, |
1099 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1100 | goto failed_mount_group_desc; |
1101 | } | |
1102 | } | |
1103 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1104 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1105 | goto failed_mount2; |
1106 | } | |
1107 | sbi->s_gdb_count = db_count; | |
1108 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1109 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1110 | |
a686cd89 MB |
1111 | /* per fileystem reservation list head & lock */ |
1112 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1113 | sbi->s_rsv_window_root = RB_ROOT; | |
1114 | /* | |
1115 | * Add a single, static dummy reservation to the start of the | |
1116 | * reservation window list --- it gives us a placeholder for | |
1117 | * append-at-start-of-list which makes the allocation logic | |
1118 | * _much_ simpler. | |
1119 | */ | |
1120 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1121 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1122 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1123 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1124 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1125 | ||
833f4077 | 1126 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1127 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1128 | if (!err) { |
1129 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1130 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1131 | } |
1132 | if (!err) { | |
1133 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1134 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1135 | } |
1136 | if (err) { | |
2314b07c | 1137 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1138 | goto failed_mount3; |
1139 | } | |
be0726d3 JK |
1140 | |
1141 | #ifdef CONFIG_EXT2_FS_XATTR | |
47387409 TE |
1142 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
1143 | if (!sbi->s_ea_block_cache) { | |
1144 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); | |
be0726d3 JK |
1145 | goto failed_mount3; |
1146 | } | |
1147 | #endif | |
1da177e4 LT |
1148 | /* |
1149 | * set up enough so that it can read an inode | |
1150 | */ | |
1151 | sb->s_op = &ext2_sops; | |
1152 | sb->s_export_op = &ext2_export_ops; | |
1153 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1154 | |
1155 | #ifdef CONFIG_QUOTA | |
1156 | sb->dq_op = &dquot_operations; | |
161f3b74 | 1157 | sb->s_qcop = &ext2_quotactl_ops; |
64241118 | 1158 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1159 | #endif |
1160 | ||
52fcf703 DH |
1161 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1162 | if (IS_ERR(root)) { | |
1163 | ret = PTR_ERR(root); | |
0216bfcf | 1164 | goto failed_mount3; |
1da177e4 LT |
1165 | } |
1166 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1167 | iput(root); |
2314b07c | 1168 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1169 | goto failed_mount3; |
1da177e4 | 1170 | } |
52fcf703 | 1171 | |
48fde701 | 1172 | sb->s_root = d_make_root(root); |
52fcf703 | 1173 | if (!sb->s_root) { |
2314b07c | 1174 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1175 | ret = -ENOMEM; |
1176 | goto failed_mount3; | |
1177 | } | |
1da177e4 | 1178 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c OR |
1179 | ext2_msg(sb, KERN_WARNING, |
1180 | "warning: mounting ext3 filesystem as ext2"); | |
bc98a42c | 1181 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
1751e8a6 | 1182 | sb->s_flags |= SB_RDONLY; |
4c96a68b | 1183 | ext2_write_super(sb); |
1da177e4 LT |
1184 | return 0; |
1185 | ||
1186 | cantfind_ext2: | |
1187 | if (!silent) | |
2314b07c OR |
1188 | ext2_msg(sb, KERN_ERR, |
1189 | "error: can't find an ext2 filesystem on dev %s.", | |
1190 | sb->s_id); | |
1da177e4 | 1191 | goto failed_mount; |
0216bfcf | 1192 | failed_mount3: |
47387409 TE |
1193 | if (sbi->s_ea_block_cache) |
1194 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); | |
0216bfcf MC |
1195 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
1196 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1197 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1198 | failed_mount2: |
1199 | for (i = 0; i < db_count; i++) | |
1200 | brelse(sbi->s_group_desc[i]); | |
1201 | failed_mount_group_desc: | |
1202 | kfree(sbi->s_group_desc); | |
1203 | kfree(sbi->s_debts); | |
1204 | failed_mount: | |
1205 | brelse(bh); | |
1206 | failed_sbi: | |
1207 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1208 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1209 | kfree(sbi); |
e124a320 | 1210 | failed: |
8cf037a8 | 1211 | fs_put_dax(dax_dev); |
52fcf703 | 1212 | return ret; |
1da177e4 LT |
1213 | } |
1214 | ||
7bf0dc9b TT |
1215 | static void ext2_clear_super_error(struct super_block *sb) |
1216 | { | |
1217 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1218 | ||
1219 | if (buffer_write_io_error(sbh)) { | |
1220 | /* | |
1221 | * Oh, dear. A previous attempt to write the | |
1222 | * superblock failed. This could happen because the | |
1223 | * USB device was yanked out. Or it could happen to | |
1224 | * be a transient write error and maybe the block will | |
1225 | * be remapped. Nothing we can do but to retry the | |
1226 | * write and hope for the best. | |
1227 | */ | |
2b8120ef JB |
1228 | ext2_msg(sb, KERN_ERR, |
1229 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1230 | clear_buffer_write_io_error(sbh); |
1231 | set_buffer_uptodate(sbh); | |
1232 | } | |
1233 | } | |
1234 | ||
65547661 JK |
1235 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1236 | int wait) | |
1da177e4 | 1237 | { |
7bf0dc9b | 1238 | ext2_clear_super_error(sb); |
c15271f4 | 1239 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1240 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1241 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1242 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1243 | /* unlock before we do IO */ |
1244 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1245 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1246 | if (wait) |
1247 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | /* | |
1251 | * In the second extended file system, it is not necessary to | |
1252 | * write the super block since we use a mapping of the | |
1253 | * disk super block in a buffer. | |
1254 | * | |
1255 | * However, this function is still used to set the fs valid | |
1256 | * flags to 0. We need to set this flag to 0 since the fs | |
1257 | * may have been checked while mounted and e2fsck may have | |
1258 | * set s_state to EXT2_VALID_FS after some corrections. | |
1259 | */ | |
40f31dd4 | 1260 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1261 | { |
c15271f4 | 1262 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1263 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1264 | ||
a1177825 JK |
1265 | /* |
1266 | * Write quota structures to quota file, sync_blockdev() will write | |
1267 | * them to disk later | |
1268 | */ | |
1269 | dquot_writeback_dquots(sb, -1); | |
1270 | ||
c15271f4 | 1271 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1272 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1273 | ext2_debug("setting valid to 0\n"); | |
1274 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1275 | } |
c15271f4 | 1276 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1277 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1278 | return 0; |
1279 | } | |
1280 | ||
1e8b212f JK |
1281 | static int ext2_freeze(struct super_block *sb) |
1282 | { | |
1283 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1284 | ||
1285 | /* | |
1286 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1287 | * because we have unattached inodes and thus filesystem is not fully | |
1288 | * consistent. | |
1289 | */ | |
1290 | if (atomic_long_read(&sb->s_remove_count)) { | |
1291 | ext2_sync_fs(sb, 1); | |
1292 | return 0; | |
1293 | } | |
1294 | /* Set EXT2_FS_VALID flag */ | |
1295 | spin_lock(&sbi->s_lock); | |
1296 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1297 | spin_unlock(&sbi->s_lock); | |
1298 | ext2_sync_super(sb, sbi->s_es, 1); | |
1299 | ||
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | static int ext2_unfreeze(struct super_block *sb) | |
1304 | { | |
1305 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1306 | ext2_write_super(sb); | |
1307 | ||
1308 | return 0; | |
1309 | } | |
40f31dd4 | 1310 | |
65547661 | 1311 | static void ext2_write_super(struct super_block *sb) |
40f31dd4 | 1312 | { |
bc98a42c | 1313 | if (!sb_rdonly(sb)) |
40f31dd4 | 1314 | ext2_sync_fs(sb, 1); |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1318 | { | |
1319 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1320 | struct ext2_super_block * es; | |
08851957 | 1321 | struct ext2_mount_options new_opts; |
50a52234 JK |
1322 | int err; |
1323 | ||
02b9984d | 1324 | sync_filesystem(sb); |
337eb00a | 1325 | |
8af634ff | 1326 | spin_lock(&sbi->s_lock); |
08851957 JK |
1327 | new_opts.s_mount_opt = sbi->s_mount_opt; |
1328 | new_opts.s_resuid = sbi->s_resuid; | |
1329 | new_opts.s_resgid = sbi->s_resgid; | |
8af634ff | 1330 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1331 | |
1332 | /* | |
1333 | * Allow the "check" option to be passed as a remount option. | |
1334 | */ | |
8af634ff | 1335 | if (!parse_options(data, sb, &new_opts)) |
08851957 | 1336 | return -EINVAL; |
1da177e4 | 1337 | |
8af634ff | 1338 | spin_lock(&sbi->s_lock); |
1da177e4 | 1339 | es = sbi->s_es; |
08851957 | 1340 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
2314b07c | 1341 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
9c3ce9ec | 1342 | "dax flag with busy inodes while remounting"); |
08851957 | 1343 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
337eb00a | 1344 | } |
1751e8a6 | 1345 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
08851957 | 1346 | goto out_set; |
1751e8a6 | 1347 | if (*flags & SB_RDONLY) { |
1da177e4 | 1348 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
08851957 JK |
1349 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
1350 | goto out_set; | |
c79d967d | 1351 | |
1da177e4 LT |
1352 | /* |
1353 | * OK, we are remounting a valid rw partition rdonly, so set | |
1354 | * the rdonly flag and then mark the partition as valid again. | |
1355 | */ | |
1356 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1357 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1358 | spin_unlock(&sbi->s_lock); |
c79d967d | 1359 | |
0f0dd62f | 1360 | err = dquot_suspend(sb, -1); |
08851957 JK |
1361 | if (err < 0) |
1362 | return err; | |
c79d967d | 1363 | |
4c96a68b | 1364 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1365 | } else { |
1366 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1367 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1368 | if (ret) { | |
08851957 | 1369 | spin_unlock(&sbi->s_lock); |
2314b07c OR |
1370 | ext2_msg(sb, KERN_WARNING, |
1371 | "warning: couldn't remount RDWR because of " | |
1372 | "unsupported optional features (%x).", | |
1373 | le32_to_cpu(ret)); | |
08851957 | 1374 | return -EROFS; |
1da177e4 LT |
1375 | } |
1376 | /* | |
1377 | * Mounting a RDONLY partition read-write, so reread and | |
1378 | * store the current valid flag. (It may have been changed | |
1379 | * by e2fsck since we originally mounted the partition.) | |
1380 | */ | |
1381 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1382 | if (!ext2_setup_super (sb, es, 0)) | |
1751e8a6 | 1383 | sb->s_flags &= ~SB_RDONLY; |
c15271f4 | 1384 | spin_unlock(&sbi->s_lock); |
c79d967d | 1385 | |
4c96a68b | 1386 | ext2_write_super(sb); |
c79d967d | 1387 | |
0f0dd62f | 1388 | dquot_resume(sb, -1); |
1da177e4 | 1389 | } |
c79d967d | 1390 | |
08851957 JK |
1391 | spin_lock(&sbi->s_lock); |
1392 | out_set: | |
1393 | sbi->s_mount_opt = new_opts.s_mount_opt; | |
1394 | sbi->s_resuid = new_opts.s_resuid; | |
1395 | sbi->s_resgid = new_opts.s_resgid; | |
1751e8a6 LT |
1396 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1397 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); | |
c15271f4 | 1398 | spin_unlock(&sbi->s_lock); |
08851957 JK |
1399 | |
1400 | return 0; | |
1da177e4 LT |
1401 | } |
1402 | ||
726c3342 | 1403 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1404 | { |
726c3342 | 1405 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1406 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1407 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1408 | u64 fsid; |
1da177e4 | 1409 | |
c15271f4 JB |
1410 | spin_lock(&sbi->s_lock); |
1411 | ||
1da177e4 | 1412 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1413 | sbi->s_overhead_last = 0; |
1414 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1415 | unsigned long i, overhead = 0; | |
1416 | smp_rmb(); | |
1417 | ||
1da177e4 | 1418 | /* |
2235219b BP |
1419 | * Compute the overhead (FS structures). This is constant |
1420 | * for a given filesystem unless the number of block groups | |
1421 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1422 | */ |
1423 | ||
1424 | /* | |
1425 | * All of the blocks before first_data_block are | |
1426 | * overhead | |
1427 | */ | |
e4fca01e | 1428 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1429 | |
1430 | /* | |
1431 | * Add the overhead attributed to the superblock and | |
1432 | * block group descriptors. If the sparse superblocks | |
1433 | * feature is turned on, then not all groups have this. | |
1434 | */ | |
1435 | for (i = 0; i < sbi->s_groups_count; i++) | |
1436 | overhead += ext2_bg_has_super(sb, i) + | |
1437 | ext2_bg_num_gdb(sb, i); | |
1438 | ||
1439 | /* | |
1440 | * Every block group has an inode bitmap, a block | |
1441 | * bitmap, and an inode table. | |
1442 | */ | |
1443 | overhead += (sbi->s_groups_count * | |
1444 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1445 | sbi->s_overhead_last = overhead; |
1446 | smp_wmb(); | |
1447 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1448 | } |
1449 | ||
1450 | buf->f_type = EXT2_SUPER_MAGIC; | |
1451 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1452 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1453 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1454 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1455 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1456 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1457 | buf->f_bavail = 0; |
e4fca01e PE |
1458 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1459 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1460 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1461 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1462 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1463 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1464 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1465 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1466 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1467 | return 0; |
1468 | } | |
1469 | ||
152a0836 AV |
1470 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1471 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1472 | { |
152a0836 | 1473 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | #ifdef CONFIG_QUOTA | |
1477 | ||
1478 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1479 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1480 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1481 | * we don't have to be afraid of races */ |
1482 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1483 | size_t len, loff_t off) | |
1484 | { | |
1485 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1486 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1487 | int err = 0; | |
1488 | int offset = off & (sb->s_blocksize - 1); | |
1489 | int tocopy; | |
1490 | size_t toread; | |
1491 | struct buffer_head tmp_bh; | |
1492 | struct buffer_head *bh; | |
1493 | loff_t i_size = i_size_read(inode); | |
1494 | ||
1495 | if (off > i_size) | |
1496 | return 0; | |
1497 | if (off+len > i_size) | |
1498 | len = i_size-off; | |
1499 | toread = len; | |
1500 | while (toread > 0) { | |
1501 | tocopy = sb->s_blocksize - offset < toread ? | |
1502 | sb->s_blocksize - offset : toread; | |
1503 | ||
1504 | tmp_bh.b_state = 0; | |
c16831b4 | 1505 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1506 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1507 | if (err < 0) |
1da177e4 LT |
1508 | return err; |
1509 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1510 | memset(data, 0, tocopy); | |
1511 | else { | |
1512 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1513 | if (!bh) | |
1514 | return -EIO; | |
1515 | memcpy(data, bh->b_data+offset, tocopy); | |
1516 | brelse(bh); | |
1517 | } | |
1518 | offset = 0; | |
1519 | toread -= tocopy; | |
1520 | data += tocopy; | |
1521 | blk++; | |
1522 | } | |
1523 | return len; | |
1524 | } | |
1525 | ||
1526 | /* Write to quotafile */ | |
1527 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1528 | const char *data, size_t len, loff_t off) | |
1529 | { | |
1530 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1531 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1532 | int err = 0; | |
1533 | int offset = off & (sb->s_blocksize - 1); | |
1534 | int tocopy; | |
1535 | size_t towrite = len; | |
1536 | struct buffer_head tmp_bh; | |
1537 | struct buffer_head *bh; | |
1538 | ||
1da177e4 LT |
1539 | while (towrite > 0) { |
1540 | tocopy = sb->s_blocksize - offset < towrite ? | |
1541 | sb->s_blocksize - offset : towrite; | |
1542 | ||
1543 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1544 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1545 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1546 | if (err < 0) |
1da177e4 LT |
1547 | goto out; |
1548 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1549 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1550 | else | |
1551 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1552 | if (unlikely(!bh)) { |
1da177e4 LT |
1553 | err = -EIO; |
1554 | goto out; | |
1555 | } | |
1556 | lock_buffer(bh); | |
1557 | memcpy(bh->b_data+offset, data, tocopy); | |
1558 | flush_dcache_page(bh->b_page); | |
1559 | set_buffer_uptodate(bh); | |
1560 | mark_buffer_dirty(bh); | |
1561 | unlock_buffer(bh); | |
1562 | brelse(bh); | |
1563 | offset = 0; | |
1564 | towrite -= tocopy; | |
1565 | data += tocopy; | |
1566 | blk++; | |
1567 | } | |
1568 | out: | |
e2a3fde7 | 1569 | if (len == towrite) |
1da177e4 LT |
1570 | return err; |
1571 | if (inode->i_size < off+len-towrite) | |
1572 | i_size_write(inode, off+len-towrite); | |
e1d747d9 | 1573 | inode_inc_iversion(inode); |
078cd827 | 1574 | inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4 | 1575 | mark_inode_dirty(inode); |
1da177e4 LT |
1576 | return len - towrite; |
1577 | } | |
1578 | ||
161f3b74 JK |
1579 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1580 | const struct path *path) | |
1581 | { | |
1582 | int err; | |
1583 | struct inode *inode; | |
1584 | ||
1585 | err = dquot_quota_on(sb, type, format_id, path); | |
1586 | if (err) | |
1587 | return err; | |
1588 | ||
1589 | inode = d_inode(path->dentry); | |
1590 | inode_lock(inode); | |
1591 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; | |
1592 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, | |
1593 | S_NOATIME | S_IMMUTABLE); | |
1594 | inode_unlock(inode); | |
1595 | mark_inode_dirty(inode); | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | static int ext2_quota_off(struct super_block *sb, int type) | |
1601 | { | |
1602 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1603 | int err; | |
1604 | ||
1605 | if (!inode || !igrab(inode)) | |
1606 | goto out; | |
1607 | ||
1608 | err = dquot_quota_off(sb, type); | |
1609 | if (err) | |
1610 | goto out_put; | |
1611 | ||
1612 | inode_lock(inode); | |
1613 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); | |
1614 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); | |
1615 | inode_unlock(inode); | |
1616 | mark_inode_dirty(inode); | |
1617 | out_put: | |
1618 | iput(inode); | |
1619 | return err; | |
1620 | out: | |
1621 | return dquot_quota_off(sb, type); | |
1622 | } | |
1623 | ||
1da177e4 LT |
1624 | #endif |
1625 | ||
1626 | static struct file_system_type ext2_fs_type = { | |
1627 | .owner = THIS_MODULE, | |
1628 | .name = "ext2", | |
152a0836 | 1629 | .mount = ext2_mount, |
1da177e4 | 1630 | .kill_sb = kill_block_super, |
46b15caa | 1631 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 1632 | }; |
7f78e035 | 1633 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1634 | |
1635 | static int __init init_ext2_fs(void) | |
1636 | { | |
be0726d3 JK |
1637 | int err; |
1638 | ||
1da177e4 LT |
1639 | err = init_inodecache(); |
1640 | if (err) | |
be0726d3 | 1641 | return err; |
1da177e4 LT |
1642 | err = register_filesystem(&ext2_fs_type); |
1643 | if (err) | |
1644 | goto out; | |
1645 | return 0; | |
1646 | out: | |
1647 | destroy_inodecache(); | |
1da177e4 LT |
1648 | return err; |
1649 | } | |
1650 | ||
1651 | static void __exit exit_ext2_fs(void) | |
1652 | { | |
1653 | unregister_filesystem(&ext2_fs_type); | |
1654 | destroy_inodecache(); | |
1da177e4 LT |
1655 | } |
1656 | ||
302bf2f3 PG |
1657 | MODULE_AUTHOR("Remy Card and others"); |
1658 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1659 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1660 | module_init(init_ext2_fs) |
1661 | module_exit(exit_ext2_fs) |