Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ext2/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/string.h> | |
8fc2751b | 21 | #include <linux/fs.h> |
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/parser.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/buffer_head.h> | |
a5694255 | 28 | #include <linux/exportfs.h> |
1da177e4 | 29 | #include <linux/vfs.h> |
8fc2751b MB |
30 | #include <linux/seq_file.h> |
31 | #include <linux/mount.h> | |
d8ea6cf8 | 32 | #include <linux/log2.h> |
74abb989 | 33 | #include <linux/quotaops.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include "ext2.h" | |
36 | #include "xattr.h" | |
37 | #include "acl.h" | |
6d79125b | 38 | #include "xip.h" |
1da177e4 LT |
39 | |
40 | static void ext2_sync_super(struct super_block *sb, | |
ee6921eb | 41 | struct ext2_super_block *es, int wait); |
1da177e4 | 42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 44 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1da177e4 LT |
45 | |
46 | void ext2_error (struct super_block * sb, const char * function, | |
47 | const char * fmt, ...) | |
48 | { | |
49 | va_list args; | |
50 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
51 | struct ext2_super_block *es = sbi->s_es; | |
52 | ||
53 | if (!(sb->s_flags & MS_RDONLY)) { | |
c15271f4 | 54 | spin_lock(&sbi->s_lock); |
1da177e4 | 55 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 56 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 57 | spin_unlock(&sbi->s_lock); |
ee6921eb | 58 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
59 | } |
60 | ||
61 | va_start(args, fmt); | |
2314b07c | 62 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: ", sb->s_id, function); |
1da177e4 LT |
63 | vprintk(fmt, args); |
64 | printk("\n"); | |
65 | va_end(args); | |
66 | ||
67 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 68 | panic("EXT2-fs: panic from previous error\n"); |
1da177e4 | 69 | if (test_opt(sb, ERRORS_RO)) { |
2314b07c AF |
70 | ext2_msg(sb, KERN_CRIT, |
71 | "error: remounting filesystem read-only"); | |
1da177e4 LT |
72 | sb->s_flags |= MS_RDONLY; |
73 | } | |
74 | } | |
75 | ||
2314b07c AF |
76 | void ext2_msg(struct super_block *sb, const char *prefix, |
77 | const char *fmt, ...) | |
1da177e4 LT |
78 | { |
79 | va_list args; | |
80 | ||
81 | va_start(args, fmt); | |
2314b07c | 82 | printk("%sEXT2-fs (%s): ", prefix, sb->s_id); |
1da177e4 LT |
83 | vprintk(fmt, args); |
84 | printk("\n"); | |
85 | va_end(args); | |
86 | } | |
87 | ||
c15271f4 JB |
88 | /* |
89 | * This must be called with sbi->s_lock held. | |
90 | */ | |
1da177e4 LT |
91 | void ext2_update_dynamic_rev(struct super_block *sb) |
92 | { | |
93 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
94 | ||
95 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
96 | return; | |
97 | ||
2314b07c AF |
98 | ext2_msg(sb, KERN_WARNING, |
99 | "warning: updating to rev %d because of " | |
100 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
101 | EXT2_DYNAMIC_REV); |
102 | ||
103 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
104 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
105 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
106 | /* leave es->s_feature_*compat flags alone */ | |
107 | /* es->s_uuid will be set by e2fsck if empty */ | |
108 | ||
109 | /* | |
110 | * The rest of the superblock fields should be zero, and if not it | |
111 | * means they are likely already in use, so leave them alone. We | |
112 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
113 | */ | |
114 | } | |
115 | ||
116 | static void ext2_put_super (struct super_block * sb) | |
117 | { | |
118 | int db_count; | |
119 | int i; | |
120 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
121 | ||
e0ccfd95 CH |
122 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
123 | ||
8c85e125 CH |
124 | if (sb->s_dirt) |
125 | ext2_write_super(sb); | |
126 | ||
1da177e4 LT |
127 | ext2_xattr_put_super(sb); |
128 | if (!(sb->s_flags & MS_RDONLY)) { | |
129 | struct ext2_super_block *es = sbi->s_es; | |
130 | ||
c15271f4 | 131 | spin_lock(&sbi->s_lock); |
1da177e4 | 132 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 133 | spin_unlock(&sbi->s_lock); |
ee6921eb | 134 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
135 | } |
136 | db_count = sbi->s_gdb_count; | |
137 | for (i = 0; i < db_count; i++) | |
138 | if (sbi->s_group_desc[i]) | |
139 | brelse (sbi->s_group_desc[i]); | |
140 | kfree(sbi->s_group_desc); | |
141 | kfree(sbi->s_debts); | |
142 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
143 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
144 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
145 | brelse (sbi->s_sbh); | |
146 | sb->s_fs_info = NULL; | |
18a82eb9 | 147 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 148 | kfree(sbi); |
1da177e4 LT |
149 | } |
150 | ||
e18b890b | 151 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
152 | |
153 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
154 | { | |
155 | struct ext2_inode_info *ei; | |
e94b1766 | 156 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
157 | if (!ei) |
158 | return NULL; | |
a686cd89 | 159 | ei->i_block_alloc_info = NULL; |
1da177e4 LT |
160 | ei->vfs_inode.i_version = 1; |
161 | return &ei->vfs_inode; | |
162 | } | |
163 | ||
164 | static void ext2_destroy_inode(struct inode *inode) | |
165 | { | |
166 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); | |
167 | } | |
168 | ||
51cc5068 | 169 | static void init_once(void *foo) |
1da177e4 LT |
170 | { |
171 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
172 | ||
a35afb83 | 173 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 174 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 175 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 176 | #endif |
a686cd89 | 177 | mutex_init(&ei->truncate_mutex); |
a35afb83 | 178 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 179 | } |
20c2df83 | 180 | |
1da177e4 LT |
181 | static int init_inodecache(void) |
182 | { | |
183 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
184 | sizeof(struct ext2_inode_info), | |
fffb60f9 PJ |
185 | 0, (SLAB_RECLAIM_ACCOUNT| |
186 | SLAB_MEM_SPREAD), | |
20c2df83 | 187 | init_once); |
1da177e4 LT |
188 | if (ext2_inode_cachep == NULL) |
189 | return -ENOMEM; | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static void destroy_inodecache(void) | |
194 | { | |
1a1d92c1 | 195 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
196 | } |
197 | ||
198 | static void ext2_clear_inode(struct inode *inode) | |
199 | { | |
a686cd89 | 200 | struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info; |
257ba15c | 201 | |
9f754758 | 202 | dquot_drop(inode); |
a686cd89 MB |
203 | ext2_discard_reservation(inode); |
204 | EXT2_I(inode)->i_block_alloc_info = NULL; | |
205 | if (unlikely(rsv)) | |
206 | kfree(rsv); | |
1da177e4 LT |
207 | } |
208 | ||
8fc2751b MB |
209 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) |
210 | { | |
93d44cb2 MS |
211 | struct super_block *sb = vfs->mnt_sb; |
212 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
213 | struct ext2_super_block *es = sbi->s_es; | |
214 | unsigned long def_mount_opts; | |
8fc2751b | 215 | |
c15271f4 | 216 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
217 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
218 | ||
219 | if (sbi->s_sb_block != 1) | |
220 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
221 | if (test_opt(sb, MINIX_DF)) | |
222 | seq_puts(seq, ",minixdf"); | |
223 | if (test_opt(sb, GRPID)) | |
8fc2751b | 224 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
225 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
226 | seq_puts(seq, ",nogrpid"); | |
227 | if (sbi->s_resuid != EXT2_DEF_RESUID || | |
228 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { | |
229 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
230 | } | |
231 | if (sbi->s_resgid != EXT2_DEF_RESGID || | |
232 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { | |
233 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
234 | } | |
14e11e10 | 235 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
236 | int def_errors = le16_to_cpu(es->s_errors); |
237 | ||
238 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
239 | def_errors == EXT2_ERRORS_CONTINUE) { |
240 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
241 | } |
242 | } | |
14e11e10 AK |
243 | if (test_opt(sb, ERRORS_CONT)) |
244 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
245 | if (test_opt(sb, ERRORS_PANIC)) |
246 | seq_puts(seq, ",errors=panic"); | |
247 | if (test_opt(sb, NO_UID32)) | |
248 | seq_puts(seq, ",nouid32"); | |
249 | if (test_opt(sb, DEBUG)) | |
250 | seq_puts(seq, ",debug"); | |
251 | if (test_opt(sb, OLDALLOC)) | |
252 | seq_puts(seq, ",oldalloc"); | |
253 | ||
254 | #ifdef CONFIG_EXT2_FS_XATTR | |
255 | if (test_opt(sb, XATTR_USER)) | |
256 | seq_puts(seq, ",user_xattr"); | |
257 | if (!test_opt(sb, XATTR_USER) && | |
258 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
259 | seq_puts(seq, ",nouser_xattr"); | |
260 | } | |
261 | #endif | |
262 | ||
263 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
264 | if (test_opt(sb, POSIX_ACL)) | |
265 | seq_puts(seq, ",acl"); | |
266 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
267 | seq_puts(seq, ",noacl"); | |
268 | #endif | |
269 | ||
270 | if (test_opt(sb, NOBH)) | |
271 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
272 | |
273 | #if defined(CONFIG_QUOTA) | |
274 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
275 | seq_puts(seq, ",usrquota"); | |
276 | ||
277 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
278 | seq_puts(seq, ",grpquota"); | |
279 | #endif | |
280 | ||
83541796 CO |
281 | #if defined(CONFIG_EXT2_FS_XIP) |
282 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) | |
283 | seq_puts(seq, ",xip"); | |
284 | #endif | |
285 | ||
35c879dc MS |
286 | if (!test_opt(sb, RESERVATION)) |
287 | seq_puts(seq, ",noreservation"); | |
288 | ||
c15271f4 | 289 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
290 | return 0; |
291 | } | |
292 | ||
1da177e4 LT |
293 | #ifdef CONFIG_QUOTA |
294 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
295 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
296 | #endif | |
297 | ||
ee9b6d61 | 298 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
299 | .alloc_inode = ext2_alloc_inode, |
300 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 LT |
301 | .write_inode = ext2_write_inode, |
302 | .delete_inode = ext2_delete_inode, | |
303 | .put_super = ext2_put_super, | |
304 | .write_super = ext2_write_super, | |
40f31dd4 | 305 | .sync_fs = ext2_sync_fs, |
1da177e4 LT |
306 | .statfs = ext2_statfs, |
307 | .remount_fs = ext2_remount, | |
308 | .clear_inode = ext2_clear_inode, | |
8fc2751b | 309 | .show_options = ext2_show_options, |
1da177e4 LT |
310 | #ifdef CONFIG_QUOTA |
311 | .quota_read = ext2_quota_read, | |
312 | .quota_write = ext2_quota_write, | |
313 | #endif | |
314 | }; | |
315 | ||
2e4c68e3 CH |
316 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
317 | u64 ino, u32 generation) | |
ecaff756 | 318 | { |
ecaff756 | 319 | struct inode *inode; |
ecaff756 N |
320 | |
321 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
322 | return ERR_PTR(-ESTALE); | |
323 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
324 | return ERR_PTR(-ESTALE); | |
325 | ||
326 | /* iget isn't really right if the inode is currently unallocated!! | |
327 | * ext2_read_inode currently does appropriate checks, but | |
328 | * it might be "neater" to call ext2_get_inode first and check | |
329 | * if the inode is valid..... | |
330 | */ | |
52fcf703 DH |
331 | inode = ext2_iget(sb, ino); |
332 | if (IS_ERR(inode)) | |
333 | return ERR_CAST(inode); | |
334 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
335 | /* we didn't find the right inode.. */ |
336 | iput(inode); | |
337 | return ERR_PTR(-ESTALE); | |
338 | } | |
2e4c68e3 CH |
339 | return inode; |
340 | } | |
341 | ||
342 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
343 | int fh_len, int fh_type) | |
344 | { | |
345 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
346 | ext2_nfs_get_inode); | |
347 | } | |
348 | ||
349 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
350 | int fh_len, int fh_type) | |
351 | { | |
352 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
353 | ext2_nfs_get_inode); | |
ecaff756 N |
354 | } |
355 | ||
1da177e4 LT |
356 | /* Yes, most of these are left as NULL!! |
357 | * A NULL value implies the default, which works with ext2-like file | |
358 | * systems, but can be improved upon. | |
359 | * Currently only get_parent is required. | |
360 | */ | |
39655164 | 361 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
362 | .fh_to_dentry = ext2_fh_to_dentry, |
363 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
364 | .get_parent = ext2_get_parent, |
365 | }; | |
366 | ||
367 | static unsigned long get_sb_block(void **data) | |
368 | { | |
369 | unsigned long sb_block; | |
370 | char *options = (char *) *data; | |
371 | ||
372 | if (!options || strncmp(options, "sb=", 3) != 0) | |
373 | return 1; /* Default location */ | |
374 | options += 3; | |
375 | sb_block = simple_strtoul(options, &options, 0); | |
376 | if (*options && *options != ',') { | |
377 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
378 | (char *) *data); | |
379 | return 1; | |
380 | } | |
381 | if (*options == ',') | |
382 | options++; | |
383 | *data = (void *) options; | |
384 | return sb_block; | |
385 | } | |
386 | ||
387 | enum { | |
388 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 389 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 390 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b MB |
391 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
392 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, | |
a686cd89 | 393 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
394 | }; |
395 | ||
a447c093 | 396 | static const match_table_t tokens = { |
1da177e4 LT |
397 | {Opt_bsd_df, "bsddf"}, |
398 | {Opt_minix_df, "minixdf"}, | |
399 | {Opt_grpid, "grpid"}, | |
400 | {Opt_grpid, "bsdgroups"}, | |
401 | {Opt_nogrpid, "nogrpid"}, | |
402 | {Opt_nogrpid, "sysvgroups"}, | |
403 | {Opt_resgid, "resgid=%u"}, | |
404 | {Opt_resuid, "resuid=%u"}, | |
405 | {Opt_sb, "sb=%u"}, | |
406 | {Opt_err_cont, "errors=continue"}, | |
407 | {Opt_err_panic, "errors=panic"}, | |
408 | {Opt_err_ro, "errors=remount-ro"}, | |
409 | {Opt_nouid32, "nouid32"}, | |
410 | {Opt_nocheck, "check=none"}, | |
411 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
412 | {Opt_debug, "debug"}, |
413 | {Opt_oldalloc, "oldalloc"}, | |
414 | {Opt_orlov, "orlov"}, | |
415 | {Opt_nobh, "nobh"}, | |
416 | {Opt_user_xattr, "user_xattr"}, | |
417 | {Opt_nouser_xattr, "nouser_xattr"}, | |
418 | {Opt_acl, "acl"}, | |
419 | {Opt_noacl, "noacl"}, | |
6d79125b | 420 | {Opt_xip, "xip"}, |
8fc2751b | 421 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 422 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
423 | {Opt_quota, "quota"}, |
424 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
425 | {Opt_reservation, "reservation"}, |
426 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
427 | {Opt_err, NULL} |
428 | }; | |
429 | ||
2314b07c | 430 | static int parse_options(char *options, struct super_block *sb) |
1da177e4 | 431 | { |
2314b07c AF |
432 | char *p; |
433 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1da177e4 | 434 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 LT |
435 | int option; |
436 | ||
437 | if (!options) | |
438 | return 1; | |
439 | ||
440 | while ((p = strsep (&options, ",")) != NULL) { | |
441 | int token; | |
442 | if (!*p) | |
443 | continue; | |
444 | ||
445 | token = match_token(p, tokens, args); | |
446 | switch (token) { | |
447 | case Opt_bsd_df: | |
448 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
449 | break; | |
450 | case Opt_minix_df: | |
451 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
452 | break; | |
453 | case Opt_grpid: | |
454 | set_opt (sbi->s_mount_opt, GRPID); | |
455 | break; | |
456 | case Opt_nogrpid: | |
457 | clear_opt (sbi->s_mount_opt, GRPID); | |
458 | break; | |
459 | case Opt_resuid: | |
460 | if (match_int(&args[0], &option)) | |
461 | return 0; | |
462 | sbi->s_resuid = option; | |
463 | break; | |
464 | case Opt_resgid: | |
465 | if (match_int(&args[0], &option)) | |
466 | return 0; | |
467 | sbi->s_resgid = option; | |
468 | break; | |
469 | case Opt_sb: | |
470 | /* handled by get_sb_block() instead of here */ | |
471 | /* *sb_block = match_int(&args[0]); */ | |
472 | break; | |
473 | case Opt_err_panic: | |
5a2b4062 VA |
474 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
475 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
476 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
477 | break; |
478 | case Opt_err_ro: | |
5a2b4062 VA |
479 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
480 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
481 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
482 | break; |
483 | case Opt_err_cont: | |
5a2b4062 VA |
484 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
485 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
486 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
487 | break; |
488 | case Opt_nouid32: | |
489 | set_opt (sbi->s_mount_opt, NO_UID32); | |
490 | break; | |
1da177e4 LT |
491 | case Opt_nocheck: |
492 | clear_opt (sbi->s_mount_opt, CHECK); | |
493 | break; | |
494 | case Opt_debug: | |
495 | set_opt (sbi->s_mount_opt, DEBUG); | |
496 | break; | |
497 | case Opt_oldalloc: | |
498 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
499 | break; | |
500 | case Opt_orlov: | |
501 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
502 | break; | |
503 | case Opt_nobh: | |
504 | set_opt (sbi->s_mount_opt, NOBH); | |
505 | break; | |
506 | #ifdef CONFIG_EXT2_FS_XATTR | |
507 | case Opt_user_xattr: | |
508 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
509 | break; | |
510 | case Opt_nouser_xattr: | |
511 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
512 | break; | |
513 | #else | |
514 | case Opt_user_xattr: | |
515 | case Opt_nouser_xattr: | |
2314b07c AF |
516 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
517 | "not supported"); | |
1da177e4 LT |
518 | break; |
519 | #endif | |
520 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
521 | case Opt_acl: | |
522 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
523 | break; | |
524 | case Opt_noacl: | |
525 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
526 | break; | |
527 | #else | |
528 | case Opt_acl: | |
529 | case Opt_noacl: | |
2314b07c AF |
530 | ext2_msg(sb, KERN_INFO, |
531 | "(no)acl options not supported"); | |
1da177e4 LT |
532 | break; |
533 | #endif | |
6d79125b CO |
534 | case Opt_xip: |
535 | #ifdef CONFIG_EXT2_FS_XIP | |
536 | set_opt (sbi->s_mount_opt, XIP); | |
537 | #else | |
2314b07c | 538 | ext2_msg(sb, KERN_INFO, "xip option not supported"); |
6d79125b CO |
539 | #endif |
540 | break; | |
8fc2751b MB |
541 | |
542 | #if defined(CONFIG_QUOTA) | |
543 | case Opt_quota: | |
544 | case Opt_usrquota: | |
545 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
546 | break; | |
547 | ||
548 | case Opt_grpquota: | |
549 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
550 | break; | |
551 | #else | |
552 | case Opt_quota: | |
553 | case Opt_usrquota: | |
554 | case Opt_grpquota: | |
2314b07c AF |
555 | ext2_msg(sb, KERN_INFO, |
556 | "quota operations not supported"); | |
8fc2751b MB |
557 | break; |
558 | #endif | |
559 | ||
a686cd89 MB |
560 | case Opt_reservation: |
561 | set_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 562 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
563 | break; |
564 | case Opt_noreservation: | |
565 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 566 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 567 | break; |
1da177e4 LT |
568 | case Opt_ignore: |
569 | break; | |
570 | default: | |
571 | return 0; | |
572 | } | |
573 | } | |
1da177e4 LT |
574 | return 1; |
575 | } | |
576 | ||
577 | static int ext2_setup_super (struct super_block * sb, | |
578 | struct ext2_super_block * es, | |
579 | int read_only) | |
580 | { | |
581 | int res = 0; | |
582 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
583 | ||
584 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c AF |
585 | ext2_msg(sb, KERN_ERR, |
586 | "error: revision level too high, " | |
587 | "forcing read-only mode"); | |
1da177e4 LT |
588 | res = MS_RDONLY; |
589 | } | |
590 | if (read_only) | |
591 | return res; | |
592 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c AF |
593 | ext2_msg(sb, KERN_WARNING, |
594 | "warning: mounting unchecked fs, " | |
595 | "running e2fsck is recommended"); | |
1da177e4 | 596 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c AF |
597 | ext2_msg(sb, KERN_WARNING, |
598 | "warning: mounting fs with errors, " | |
599 | "running e2fsck is recommended"); | |
1da177e4 LT |
600 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
601 | le16_to_cpu(es->s_mnt_count) >= | |
602 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c AF |
603 | ext2_msg(sb, KERN_WARNING, |
604 | "warning: maximal mount count reached, " | |
605 | "running e2fsck is recommended"); | |
1da177e4 | 606 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c AF |
607 | (le32_to_cpu(es->s_lastcheck) + |
608 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
609 | ext2_msg(sb, KERN_WARNING, | |
610 | "warning: checktime reached, " | |
611 | "running e2fsck is recommended"); | |
1da177e4 LT |
612 | if (!le16_to_cpu(es->s_max_mnt_count)) |
613 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 614 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 615 | if (test_opt (sb, DEBUG)) |
2314b07c AF |
616 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
617 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
618 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
619 | sbi->s_frag_size, | |
620 | sbi->s_groups_count, | |
621 | EXT2_BLOCKS_PER_GROUP(sb), | |
622 | EXT2_INODES_PER_GROUP(sb), | |
623 | sbi->s_mount_opt); | |
1da177e4 LT |
624 | return res; |
625 | } | |
626 | ||
197cd65a | 627 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
628 | { |
629 | int i; | |
1da177e4 | 630 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
631 | |
632 | ext2_debug ("Checking group descriptors"); | |
633 | ||
197cd65a AM |
634 | for (i = 0; i < sbi->s_groups_count; i++) { |
635 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
636 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
637 | ext2_fsblk_t last_block; | |
197cd65a | 638 | |
41f04d85 ES |
639 | if (i == sbi->s_groups_count - 1) |
640 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
641 | else | |
642 | last_block = first_block + | |
643 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
644 | ||
41f04d85 ES |
645 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
646 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
647 | { |
648 | ext2_error (sb, "ext2_check_descriptors", | |
649 | "Block bitmap for group %d" | |
650 | " not in group (block %lu)!", | |
651 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
652 | return 0; | |
653 | } | |
41f04d85 ES |
654 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
655 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
656 | { |
657 | ext2_error (sb, "ext2_check_descriptors", | |
658 | "Inode bitmap for group %d" | |
659 | " not in group (block %lu)!", | |
660 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
661 | return 0; | |
662 | } | |
41f04d85 | 663 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 664 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 665 | last_block) |
1da177e4 LT |
666 | { |
667 | ext2_error (sb, "ext2_check_descriptors", | |
668 | "Inode table for group %d" | |
669 | " not in group (block %lu)!", | |
670 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
671 | return 0; | |
672 | } | |
1da177e4 LT |
673 | } |
674 | return 1; | |
675 | } | |
676 | ||
1da177e4 LT |
677 | /* |
678 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
679 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
680 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
681 | */ | |
682 | static loff_t ext2_max_size(int bits) | |
683 | { | |
684 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
685 | int meta_blocks; |
686 | loff_t upper_limit; | |
687 | ||
688 | /* This is calculated to be the largest file size for a | |
689 | * dense, file such that the total number of | |
1da177e4 | 690 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
691 | * does not exceed 2^32 -1 |
692 | * __u32 i_blocks representing the total number of | |
693 | * 512 bytes blocks of the file | |
694 | */ | |
695 | upper_limit = (1LL << 32) - 1; | |
696 | ||
697 | /* total blocks in file system block size */ | |
698 | upper_limit >>= (bits - 9); | |
699 | ||
700 | ||
701 | /* indirect blocks */ | |
702 | meta_blocks = 1; | |
703 | /* double indirect blocks */ | |
704 | meta_blocks += 1 + (1LL << (bits-2)); | |
705 | /* tripple indirect blocks */ | |
706 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
707 | ||
708 | upper_limit -= meta_blocks; | |
709 | upper_limit <<= bits; | |
1da177e4 LT |
710 | |
711 | res += 1LL << (bits-2); | |
712 | res += 1LL << (2*(bits-2)); | |
713 | res += 1LL << (3*(bits-2)); | |
714 | res <<= bits; | |
715 | if (res > upper_limit) | |
716 | res = upper_limit; | |
902be4c5 AK |
717 | |
718 | if (res > MAX_LFS_FILESIZE) | |
719 | res = MAX_LFS_FILESIZE; | |
720 | ||
1da177e4 LT |
721 | return res; |
722 | } | |
723 | ||
724 | static unsigned long descriptor_loc(struct super_block *sb, | |
725 | unsigned long logic_sb_block, | |
726 | int nr) | |
727 | { | |
728 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 729 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
730 | int has_super = 0; |
731 | ||
1da177e4 LT |
732 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
733 | ||
734 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
735 | nr < first_meta_bg) | |
736 | return (logic_sb_block + nr + 1); | |
737 | bg = sbi->s_desc_per_block * nr; | |
738 | if (ext2_bg_has_super(sb, bg)) | |
739 | has_super = 1; | |
24097d12 AM |
740 | |
741 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
742 | } |
743 | ||
744 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
745 | { | |
746 | struct buffer_head * bh; | |
747 | struct ext2_sb_info * sbi; | |
748 | struct ext2_super_block * es; | |
749 | struct inode *root; | |
750 | unsigned long block; | |
751 | unsigned long sb_block = get_sb_block(&data); | |
752 | unsigned long logic_sb_block; | |
753 | unsigned long offset = 0; | |
754 | unsigned long def_mount_opts; | |
52fcf703 | 755 | long ret = -EINVAL; |
1da177e4 LT |
756 | int blocksize = BLOCK_SIZE; |
757 | int db_count; | |
758 | int i, j; | |
759 | __le32 features; | |
833f4077 | 760 | int err; |
1da177e4 | 761 | |
f8314dc6 | 762 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 LT |
763 | if (!sbi) |
764 | return -ENOMEM; | |
18a82eb9 PE |
765 | |
766 | sbi->s_blockgroup_lock = | |
767 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
768 | if (!sbi->s_blockgroup_lock) { | |
769 | kfree(sbi); | |
770 | return -ENOMEM; | |
771 | } | |
1da177e4 | 772 | sb->s_fs_info = sbi; |
93d44cb2 | 773 | sbi->s_sb_block = sb_block; |
1da177e4 | 774 | |
c15271f4 JB |
775 | spin_lock_init(&sbi->s_lock); |
776 | ||
1da177e4 LT |
777 | /* |
778 | * See what the current blocksize for the device is, and | |
779 | * use that as the blocksize. Otherwise (or if the blocksize | |
780 | * is smaller than the default) use the default. | |
781 | * This is important for devices that have a hardware | |
782 | * sectorsize that is larger than the default. | |
783 | */ | |
784 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
785 | if (!blocksize) { | |
2314b07c | 786 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
787 | goto failed_sbi; |
788 | } | |
789 | ||
790 | /* | |
791 | * If the superblock doesn't start on a hardware sector boundary, | |
792 | * calculate the offset. | |
793 | */ | |
794 | if (blocksize != BLOCK_SIZE) { | |
795 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
796 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
797 | } else { | |
798 | logic_sb_block = sb_block; | |
799 | } | |
800 | ||
801 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 802 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
803 | goto failed_sbi; |
804 | } | |
805 | /* | |
806 | * Note: s_es must be initialized as soon as possible because | |
807 | * some ext2 macro-instructions depend on its value | |
808 | */ | |
809 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
810 | sbi->s_es = es; | |
811 | sb->s_magic = le16_to_cpu(es->s_magic); | |
812 | ||
813 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
814 | goto cantfind_ext2; | |
815 | ||
816 | /* Set defaults before we parse the mount options */ | |
817 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
818 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
819 | set_opt(sbi->s_mount_opt, DEBUG); | |
820 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
821 | set_opt(sbi->s_mount_opt, GRPID); | |
822 | if (def_mount_opts & EXT2_DEFM_UID16) | |
823 | set_opt(sbi->s_mount_opt, NO_UID32); | |
2e7842b8 | 824 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 LT |
825 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
826 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
2e7842b8 HD |
827 | #endif |
828 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 LT |
829 | if (def_mount_opts & EXT2_DEFM_ACL) |
830 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
2e7842b8 | 831 | #endif |
1da177e4 LT |
832 | |
833 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
834 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
14e11e10 | 835 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
5a2b4062 | 836 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
14e11e10 AK |
837 | else |
838 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
839 | |
840 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
841 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
842 | ||
a686cd89 MB |
843 | set_opt(sbi->s_mount_opt, RESERVATION); |
844 | ||
2314b07c | 845 | if (!parse_options((char *) data, sb)) |
1da177e4 LT |
846 | goto failed_mount; |
847 | ||
848 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
849 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
850 | MS_POSIXACL : 0); | |
851 | ||
6d79125b CO |
852 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
853 | EXT2_MOUNT_XIP if not */ | |
854 | ||
1da177e4 LT |
855 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
856 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
857 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
858 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c AF |
859 | ext2_msg(sb, KERN_WARNING, |
860 | "warning: feature flags set on rev 0 fs, " | |
861 | "running e2fsck is recommended"); | |
1da177e4 LT |
862 | /* |
863 | * Check feature flags regardless of the revision level, since we | |
864 | * previously didn't change the revision level when setting the flags, | |
865 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
866 | */ | |
867 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
868 | if (features) { | |
2314b07c AF |
869 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
870 | "unsupported optional features (%x)", | |
871 | le32_to_cpu(features)); | |
1da177e4 LT |
872 | goto failed_mount; |
873 | } | |
874 | if (!(sb->s_flags & MS_RDONLY) && | |
875 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
2314b07c AF |
876 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
877 | "unsupported optional features (%x)", | |
878 | le32_to_cpu(features)); | |
1da177e4 LT |
879 | goto failed_mount; |
880 | } | |
881 | ||
882 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
883 | ||
a8e3eff4 | 884 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { |
6d79125b | 885 | if (!silent) |
2314b07c AF |
886 | ext2_msg(sb, KERN_ERR, |
887 | "error: unsupported blocksize for xip"); | |
6d79125b CO |
888 | goto failed_mount; |
889 | } | |
890 | ||
1da177e4 LT |
891 | /* If the blocksize doesn't match, re-read the thing.. */ |
892 | if (sb->s_blocksize != blocksize) { | |
893 | brelse(bh); | |
894 | ||
895 | if (!sb_set_blocksize(sb, blocksize)) { | |
2314b07c | 896 | ext2_msg(sb, KERN_ERR, "error: blocksize is too small"); |
1da177e4 LT |
897 | goto failed_sbi; |
898 | } | |
899 | ||
900 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
901 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
902 | bh = sb_bread(sb, logic_sb_block); | |
903 | if(!bh) { | |
2314b07c AF |
904 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
905 | "superblock on 2nd try"); | |
1da177e4 LT |
906 | goto failed_sbi; |
907 | } | |
908 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
909 | sbi->s_es = es; | |
910 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 911 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
912 | goto failed_mount; |
913 | } | |
914 | } | |
915 | ||
916 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
917 | ||
918 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
919 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
920 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
921 | } else { | |
922 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
923 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
924 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 925 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 926 | (sbi->s_inode_size > blocksize)) { |
2314b07c AF |
927 | ext2_msg(sb, KERN_ERR, |
928 | "error: unsupported inode size: %d", | |
1da177e4 LT |
929 | sbi->s_inode_size); |
930 | goto failed_mount; | |
931 | } | |
932 | } | |
933 | ||
934 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
935 | le32_to_cpu(es->s_log_frag_size); | |
936 | if (sbi->s_frag_size == 0) | |
937 | goto cantfind_ext2; | |
938 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
939 | ||
940 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
941 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
942 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
943 | ||
944 | if (EXT2_INODE_SIZE(sb) == 0) | |
945 | goto cantfind_ext2; | |
946 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 947 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
948 | goto cantfind_ext2; |
949 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
950 | sbi->s_inodes_per_block; | |
951 | sbi->s_desc_per_block = sb->s_blocksize / | |
952 | sizeof (struct ext2_group_desc); | |
953 | sbi->s_sbh = bh; | |
954 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
955 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 956 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 957 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 958 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
959 | |
960 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
961 | goto cantfind_ext2; | |
962 | ||
963 | if (sb->s_blocksize != bh->b_size) { | |
964 | if (!silent) | |
2314b07c | 965 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
966 | goto failed_mount; |
967 | } | |
968 | ||
969 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c AF |
970 | ext2_msg(sb, KERN_ERR, |
971 | "error: fragsize %lu != blocksize %lu" | |
972 | "(not supported yet)", | |
1da177e4 LT |
973 | sbi->s_frag_size, sb->s_blocksize); |
974 | goto failed_mount; | |
975 | } | |
976 | ||
977 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
978 | ext2_msg(sb, KERN_ERR, |
979 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
980 | sbi->s_blocks_per_group); |
981 | goto failed_mount; | |
982 | } | |
983 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
984 | ext2_msg(sb, KERN_ERR, |
985 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
986 | sbi->s_frags_per_group); |
987 | goto failed_mount; | |
988 | } | |
989 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
990 | ext2_msg(sb, KERN_ERR, |
991 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
992 | sbi->s_inodes_per_group); |
993 | goto failed_mount; | |
994 | } | |
995 | ||
996 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
997 | goto cantfind_ext2; | |
41f04d85 ES |
998 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
999 | le32_to_cpu(es->s_first_data_block) - 1) | |
1000 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1001 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1002 | EXT2_DESC_PER_BLOCK(sb); | |
1003 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1004 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1005 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1006 | goto failed_mount; |
1007 | } | |
18a82eb9 | 1008 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1009 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1010 | if (!sbi->s_debts) { |
2314b07c | 1011 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1012 | goto failed_mount_group_desc; |
1013 | } | |
1da177e4 LT |
1014 | for (i = 0; i < db_count; i++) { |
1015 | block = descriptor_loc(sb, logic_sb_block, i); | |
1016 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1017 | if (!sbi->s_group_desc[i]) { | |
1018 | for (j = 0; j < i; j++) | |
1019 | brelse (sbi->s_group_desc[j]); | |
2314b07c AF |
1020 | ext2_msg(sb, KERN_ERR, |
1021 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1022 | goto failed_mount_group_desc; |
1023 | } | |
1024 | } | |
1025 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1026 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1027 | goto failed_mount2; |
1028 | } | |
1029 | sbi->s_gdb_count = db_count; | |
1030 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1031 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1032 | |
a686cd89 MB |
1033 | /* per fileystem reservation list head & lock */ |
1034 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1035 | sbi->s_rsv_window_root = RB_ROOT; | |
1036 | /* | |
1037 | * Add a single, static dummy reservation to the start of the | |
1038 | * reservation window list --- it gives us a placeholder for | |
1039 | * append-at-start-of-list which makes the allocation logic | |
1040 | * _much_ simpler. | |
1041 | */ | |
1042 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1043 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1044 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1045 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1046 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1047 | ||
833f4077 | 1048 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
0216bfcf | 1049 | ext2_count_free_blocks(sb)); |
833f4077 PZ |
1050 | if (!err) { |
1051 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
0216bfcf | 1052 | ext2_count_free_inodes(sb)); |
833f4077 PZ |
1053 | } |
1054 | if (!err) { | |
1055 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
0216bfcf | 1056 | ext2_count_dirs(sb)); |
833f4077 PZ |
1057 | } |
1058 | if (err) { | |
2314b07c | 1059 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1060 | goto failed_mount3; |
1061 | } | |
1da177e4 LT |
1062 | /* |
1063 | * set up enough so that it can read an inode | |
1064 | */ | |
1065 | sb->s_op = &ext2_sops; | |
1066 | sb->s_export_op = &ext2_export_ops; | |
1067 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1068 | |
1069 | #ifdef CONFIG_QUOTA | |
1070 | sb->dq_op = &dquot_operations; | |
1071 | sb->s_qcop = &vfs_quotactl_ops; | |
1072 | #endif | |
1073 | ||
52fcf703 DH |
1074 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1075 | if (IS_ERR(root)) { | |
1076 | ret = PTR_ERR(root); | |
0216bfcf | 1077 | goto failed_mount3; |
1da177e4 LT |
1078 | } |
1079 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1080 | iput(root); |
2314b07c | 1081 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1082 | goto failed_mount3; |
1da177e4 | 1083 | } |
52fcf703 DH |
1084 | |
1085 | sb->s_root = d_alloc_root(root); | |
1086 | if (!sb->s_root) { | |
1087 | iput(root); | |
2314b07c | 1088 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1089 | ret = -ENOMEM; |
1090 | goto failed_mount3; | |
1091 | } | |
1da177e4 | 1092 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c AF |
1093 | ext2_msg(sb, KERN_WARNING, |
1094 | "warning: mounting ext3 filesystem as ext2"); | |
4c96a68b JB |
1095 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
1096 | sb->s_flags |= MS_RDONLY; | |
1097 | ext2_write_super(sb); | |
1da177e4 LT |
1098 | return 0; |
1099 | ||
1100 | cantfind_ext2: | |
1101 | if (!silent) | |
2314b07c AF |
1102 | ext2_msg(sb, KERN_ERR, |
1103 | "error: can't find an ext2 filesystem on dev %s.", | |
1104 | sb->s_id); | |
1da177e4 | 1105 | goto failed_mount; |
0216bfcf MC |
1106 | failed_mount3: |
1107 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1108 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1109 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1110 | failed_mount2: |
1111 | for (i = 0; i < db_count; i++) | |
1112 | brelse(sbi->s_group_desc[i]); | |
1113 | failed_mount_group_desc: | |
1114 | kfree(sbi->s_group_desc); | |
1115 | kfree(sbi->s_debts); | |
1116 | failed_mount: | |
1117 | brelse(bh); | |
1118 | failed_sbi: | |
1119 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1120 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1121 | kfree(sbi); |
52fcf703 | 1122 | return ret; |
1da177e4 LT |
1123 | } |
1124 | ||
7bf0dc9b TT |
1125 | static void ext2_clear_super_error(struct super_block *sb) |
1126 | { | |
1127 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1128 | ||
1129 | if (buffer_write_io_error(sbh)) { | |
1130 | /* | |
1131 | * Oh, dear. A previous attempt to write the | |
1132 | * superblock failed. This could happen because the | |
1133 | * USB device was yanked out. Or it could happen to | |
1134 | * be a transient write error and maybe the block will | |
1135 | * be remapped. Nothing we can do but to retry the | |
1136 | * write and hope for the best. | |
1137 | */ | |
2b8120ef JB |
1138 | ext2_msg(sb, KERN_ERR, |
1139 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1140 | clear_buffer_write_io_error(sbh); |
1141 | set_buffer_uptodate(sbh); | |
1142 | } | |
1143 | } | |
1144 | ||
ee6921eb JB |
1145 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1146 | int wait) | |
1da177e4 | 1147 | { |
7bf0dc9b | 1148 | ext2_clear_super_error(sb); |
c15271f4 | 1149 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1150 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1151 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1152 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1153 | /* unlock before we do IO */ |
1154 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1155 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1156 | if (wait) |
1157 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1158 | sb->s_dirt = 0; |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * In the second extended file system, it is not necessary to | |
1163 | * write the super block since we use a mapping of the | |
1164 | * disk super block in a buffer. | |
1165 | * | |
1166 | * However, this function is still used to set the fs valid | |
1167 | * flags to 0. We need to set this flag to 0 since the fs | |
1168 | * may have been checked while mounted and e2fsck may have | |
1169 | * set s_state to EXT2_VALID_FS after some corrections. | |
1170 | */ | |
40f31dd4 | 1171 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1172 | { |
c15271f4 | 1173 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1174 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1175 | ||
c15271f4 | 1176 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1177 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1178 | ext2_debug("setting valid to 0\n"); | |
1179 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1180 | } |
c15271f4 | 1181 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1182 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1183 | return 0; |
1184 | } | |
1185 | ||
1186 | ||
1187 | void ext2_write_super(struct super_block *sb) | |
1188 | { | |
1189 | if (!(sb->s_flags & MS_RDONLY)) | |
1190 | ext2_sync_fs(sb, 1); | |
1191 | else | |
1192 | sb->s_dirt = 0; | |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1196 | { | |
1197 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1198 | struct ext2_super_block * es; | |
6d79125b | 1199 | unsigned long old_mount_opt = sbi->s_mount_opt; |
50a52234 JK |
1200 | struct ext2_mount_options old_opts; |
1201 | unsigned long old_sb_flags; | |
1202 | int err; | |
1203 | ||
c15271f4 | 1204 | spin_lock(&sbi->s_lock); |
337eb00a | 1205 | |
50a52234 JK |
1206 | /* Store the old options */ |
1207 | old_sb_flags = sb->s_flags; | |
1208 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1209 | old_opts.s_resuid = sbi->s_resuid; | |
1210 | old_opts.s_resgid = sbi->s_resgid; | |
1da177e4 LT |
1211 | |
1212 | /* | |
1213 | * Allow the "check" option to be passed as a remount option. | |
1214 | */ | |
2314b07c | 1215 | if (!parse_options(data, sb)) { |
50a52234 JK |
1216 | err = -EINVAL; |
1217 | goto restore_opts; | |
1218 | } | |
1da177e4 LT |
1219 | |
1220 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1221 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1222 | ||
266f5aa0 CO |
1223 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
1224 | EXT2_MOUNT_XIP if not */ | |
1225 | ||
1226 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { | |
2314b07c AF |
1227 | ext2_msg(sb, KERN_WARNING, |
1228 | "warning: unsupported blocksize for xip"); | |
ddc80bd7 | 1229 | err = -EINVAL; |
266f5aa0 CO |
1230 | goto restore_opts; |
1231 | } | |
1232 | ||
1da177e4 | 1233 | es = sbi->s_es; |
6d79125b CO |
1234 | if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != |
1235 | (old_mount_opt & EXT2_MOUNT_XIP)) && | |
0e4a9b59 | 1236 | invalidate_inodes(sb)) { |
2314b07c AF |
1237 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
1238 | "xip flag with busy inodes while remounting"); | |
0e4a9b59 CO |
1239 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; |
1240 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; | |
1241 | } | |
337eb00a | 1242 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
c15271f4 | 1243 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1244 | return 0; |
337eb00a | 1245 | } |
1da177e4 LT |
1246 | if (*flags & MS_RDONLY) { |
1247 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
337eb00a | 1248 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
c15271f4 | 1249 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1250 | return 0; |
337eb00a | 1251 | } |
c79d967d | 1252 | |
1da177e4 LT |
1253 | /* |
1254 | * OK, we are remounting a valid rw partition rdonly, so set | |
1255 | * the rdonly flag and then mark the partition as valid again. | |
1256 | */ | |
1257 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1258 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1259 | spin_unlock(&sbi->s_lock); |
c79d967d | 1260 | |
0f0dd62f CH |
1261 | err = dquot_suspend(sb, -1); |
1262 | if (err < 0) { | |
c79d967d CH |
1263 | spin_lock(&sbi->s_lock); |
1264 | goto restore_opts; | |
1265 | } | |
1266 | ||
4c96a68b | 1267 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1268 | } else { |
1269 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1270 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1271 | if (ret) { | |
2314b07c AF |
1272 | ext2_msg(sb, KERN_WARNING, |
1273 | "warning: couldn't remount RDWR because of " | |
1274 | "unsupported optional features (%x).", | |
1275 | le32_to_cpu(ret)); | |
50a52234 JK |
1276 | err = -EROFS; |
1277 | goto restore_opts; | |
1da177e4 LT |
1278 | } |
1279 | /* | |
1280 | * Mounting a RDONLY partition read-write, so reread and | |
1281 | * store the current valid flag. (It may have been changed | |
1282 | * by e2fsck since we originally mounted the partition.) | |
1283 | */ | |
1284 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1285 | if (!ext2_setup_super (sb, es, 0)) | |
1286 | sb->s_flags &= ~MS_RDONLY; | |
c15271f4 | 1287 | spin_unlock(&sbi->s_lock); |
c79d967d | 1288 | |
4c96a68b | 1289 | ext2_write_super(sb); |
c79d967d | 1290 | |
0f0dd62f | 1291 | dquot_resume(sb, -1); |
1da177e4 | 1292 | } |
c79d967d | 1293 | |
1da177e4 | 1294 | return 0; |
50a52234 JK |
1295 | restore_opts: |
1296 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1297 | sbi->s_resuid = old_opts.s_resuid; | |
1298 | sbi->s_resgid = old_opts.s_resgid; | |
1299 | sb->s_flags = old_sb_flags; | |
c15271f4 | 1300 | spin_unlock(&sbi->s_lock); |
50a52234 | 1301 | return err; |
1da177e4 LT |
1302 | } |
1303 | ||
726c3342 | 1304 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1305 | { |
726c3342 | 1306 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1307 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1308 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1309 | u64 fsid; |
1da177e4 | 1310 | |
c15271f4 JB |
1311 | spin_lock(&sbi->s_lock); |
1312 | ||
1da177e4 | 1313 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1314 | sbi->s_overhead_last = 0; |
1315 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1316 | unsigned long i, overhead = 0; | |
1317 | smp_rmb(); | |
1318 | ||
1da177e4 | 1319 | /* |
2235219b BP |
1320 | * Compute the overhead (FS structures). This is constant |
1321 | * for a given filesystem unless the number of block groups | |
1322 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1323 | */ |
1324 | ||
1325 | /* | |
1326 | * All of the blocks before first_data_block are | |
1327 | * overhead | |
1328 | */ | |
e4fca01e | 1329 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1330 | |
1331 | /* | |
1332 | * Add the overhead attributed to the superblock and | |
1333 | * block group descriptors. If the sparse superblocks | |
1334 | * feature is turned on, then not all groups have this. | |
1335 | */ | |
1336 | for (i = 0; i < sbi->s_groups_count; i++) | |
1337 | overhead += ext2_bg_has_super(sb, i) + | |
1338 | ext2_bg_num_gdb(sb, i); | |
1339 | ||
1340 | /* | |
1341 | * Every block group has an inode bitmap, a block | |
1342 | * bitmap, and an inode table. | |
1343 | */ | |
1344 | overhead += (sbi->s_groups_count * | |
1345 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1346 | sbi->s_overhead_last = overhead; |
1347 | smp_wmb(); | |
1348 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1349 | } |
1350 | ||
1351 | buf->f_type = EXT2_SUPER_MAGIC; | |
1352 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1353 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1354 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1355 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1356 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1357 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1358 | buf->f_bavail = 0; |
e4fca01e PE |
1359 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1360 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1361 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1362 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1363 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1364 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1365 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1366 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1367 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1368 | return 0; |
1369 | } | |
1370 | ||
454e2398 DH |
1371 | static int ext2_get_sb(struct file_system_type *fs_type, |
1372 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 1373 | { |
454e2398 | 1374 | return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt); |
1da177e4 LT |
1375 | } |
1376 | ||
1377 | #ifdef CONFIG_QUOTA | |
1378 | ||
1379 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1380 | * acquiring the locks... As quota files are never truncated and quota code | |
1381 | * itself serializes the operations (and noone else should touch the files) | |
1382 | * we don't have to be afraid of races */ | |
1383 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1384 | size_t len, loff_t off) | |
1385 | { | |
1386 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1387 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1388 | int err = 0; | |
1389 | int offset = off & (sb->s_blocksize - 1); | |
1390 | int tocopy; | |
1391 | size_t toread; | |
1392 | struct buffer_head tmp_bh; | |
1393 | struct buffer_head *bh; | |
1394 | loff_t i_size = i_size_read(inode); | |
1395 | ||
1396 | if (off > i_size) | |
1397 | return 0; | |
1398 | if (off+len > i_size) | |
1399 | len = i_size-off; | |
1400 | toread = len; | |
1401 | while (toread > 0) { | |
1402 | tocopy = sb->s_blocksize - offset < toread ? | |
1403 | sb->s_blocksize - offset : toread; | |
1404 | ||
1405 | tmp_bh.b_state = 0; | |
c16831b4 | 1406 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1407 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1408 | if (err < 0) |
1da177e4 LT |
1409 | return err; |
1410 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1411 | memset(data, 0, tocopy); | |
1412 | else { | |
1413 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1414 | if (!bh) | |
1415 | return -EIO; | |
1416 | memcpy(data, bh->b_data+offset, tocopy); | |
1417 | brelse(bh); | |
1418 | } | |
1419 | offset = 0; | |
1420 | toread -= tocopy; | |
1421 | data += tocopy; | |
1422 | blk++; | |
1423 | } | |
1424 | return len; | |
1425 | } | |
1426 | ||
1427 | /* Write to quotafile */ | |
1428 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1429 | const char *data, size_t len, loff_t off) | |
1430 | { | |
1431 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1432 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1433 | int err = 0; | |
1434 | int offset = off & (sb->s_blocksize - 1); | |
1435 | int tocopy; | |
1436 | size_t towrite = len; | |
1437 | struct buffer_head tmp_bh; | |
1438 | struct buffer_head *bh; | |
1439 | ||
5c81a419 | 1440 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1441 | while (towrite > 0) { |
1442 | tocopy = sb->s_blocksize - offset < towrite ? | |
1443 | sb->s_blocksize - offset : towrite; | |
1444 | ||
1445 | tmp_bh.b_state = 0; | |
1446 | err = ext2_get_block(inode, blk, &tmp_bh, 1); | |
a686cd89 | 1447 | if (err < 0) |
1da177e4 LT |
1448 | goto out; |
1449 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1450 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1451 | else | |
1452 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
1453 | if (!bh) { | |
1454 | err = -EIO; | |
1455 | goto out; | |
1456 | } | |
1457 | lock_buffer(bh); | |
1458 | memcpy(bh->b_data+offset, data, tocopy); | |
1459 | flush_dcache_page(bh->b_page); | |
1460 | set_buffer_uptodate(bh); | |
1461 | mark_buffer_dirty(bh); | |
1462 | unlock_buffer(bh); | |
1463 | brelse(bh); | |
1464 | offset = 0; | |
1465 | towrite -= tocopy; | |
1466 | data += tocopy; | |
1467 | blk++; | |
1468 | } | |
1469 | out: | |
a069e9ce DC |
1470 | if (len == towrite) { |
1471 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 1472 | return err; |
a069e9ce | 1473 | } |
1da177e4 LT |
1474 | if (inode->i_size < off+len-towrite) |
1475 | i_size_write(inode, off+len-towrite); | |
1476 | inode->i_version++; | |
1477 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1478 | mark_inode_dirty(inode); | |
1b1dcc1b | 1479 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1480 | return len - towrite; |
1481 | } | |
1482 | ||
1483 | #endif | |
1484 | ||
1485 | static struct file_system_type ext2_fs_type = { | |
1486 | .owner = THIS_MODULE, | |
1487 | .name = "ext2", | |
1488 | .get_sb = ext2_get_sb, | |
1489 | .kill_sb = kill_block_super, | |
1490 | .fs_flags = FS_REQUIRES_DEV, | |
1491 | }; | |
1492 | ||
1493 | static int __init init_ext2_fs(void) | |
1494 | { | |
1495 | int err = init_ext2_xattr(); | |
1496 | if (err) | |
1497 | return err; | |
1498 | err = init_inodecache(); | |
1499 | if (err) | |
1500 | goto out1; | |
1501 | err = register_filesystem(&ext2_fs_type); | |
1502 | if (err) | |
1503 | goto out; | |
1504 | return 0; | |
1505 | out: | |
1506 | destroy_inodecache(); | |
1507 | out1: | |
1508 | exit_ext2_xattr(); | |
1509 | return err; | |
1510 | } | |
1511 | ||
1512 | static void __exit exit_ext2_fs(void) | |
1513 | { | |
1514 | unregister_filesystem(&ext2_fs_type); | |
1515 | destroy_inodecache(); | |
1516 | exit_ext2_xattr(); | |
1517 | } | |
1518 | ||
1519 | module_init(init_ext2_fs) | |
1520 | module_exit(exit_ext2_fs) |