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[PATCH] cpuset memory spread: slab cache filesystems
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / affs / super.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/statfs.h>
16#include <linux/parser.h>
17#include "affs.h"
18
19extern struct timezone sys_tz;
20
21static int affs_statfs(struct super_block *sb, struct kstatfs *buf);
22static int affs_remount (struct super_block *sb, int *flags, char *data);
23
24static void
25affs_put_super(struct super_block *sb)
26{
27 struct affs_sb_info *sbi = AFFS_SB(sb);
28 pr_debug("AFFS: put_super()\n");
29
30 if (!(sb->s_flags & MS_RDONLY)) {
31 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
32 secs_to_datestamp(get_seconds(),
33 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
34 affs_fix_checksum(sb, sbi->s_root_bh);
35 mark_buffer_dirty(sbi->s_root_bh);
36 }
37
f99d49ad 38 kfree(sbi->s_prefix);
1da177e4
LT		 39 affs_free_bitmap(sb);
40 affs_brelse(sbi->s_root_bh);
41 kfree(sbi);
42 sb->s_fs_info = NULL;
43 return;
44}
45
46static void
47affs_write_super(struct super_block *sb)
48{
49 int clean = 2;
50 struct affs_sb_info *sbi = AFFS_SB(sb);
51
52 if (!(sb->s_flags & MS_RDONLY)) {
53 // if (sbi->s_bitmap[i].bm_bh) {
54 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
55 // clean = 0;
56 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
57 secs_to_datestamp(get_seconds(),
58 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
59 affs_fix_checksum(sb, sbi->s_root_bh);
60 mark_buffer_dirty(sbi->s_root_bh);
61 sb->s_dirt = !clean; /* redo until bitmap synced */
62 } else
63 sb->s_dirt = 0;
64
65 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
66}
67
68static kmem_cache_t * affs_inode_cachep;
69
70static struct inode *affs_alloc_inode(struct super_block *sb)
71{
72 struct affs_inode_info *ei;
73 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
74 if (!ei)
75 return NULL;
76 ei->vfs_inode.i_version = 1;
77 return &ei->vfs_inode;
78}
79
80static void affs_destroy_inode(struct inode *inode)
81{
82 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
83}
84
85static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
86{
87 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
88
89 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
90 SLAB_CTOR_CONSTRUCTOR) {
91 init_MUTEX(&ei->i_link_lock);
92 init_MUTEX(&ei->i_ext_lock);
93 inode_init_once(&ei->vfs_inode);
94 }
95}
96
97static int init_inodecache(void)
98{
99 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
100 sizeof(struct affs_inode_info),
4b6a9316 101 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
1da177e4
LT		 102 init_once, NULL);
103 if (affs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106}
107
108static void destroy_inodecache(void)
109{
110 if (kmem_cache_destroy(affs_inode_cachep))
111 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
112}
113
114static struct super_operations affs_sops = {
115 .alloc_inode = affs_alloc_inode,
116 .destroy_inode = affs_destroy_inode,
117 .read_inode = affs_read_inode,
118 .write_inode = affs_write_inode,
119 .put_inode = affs_put_inode,
120 .delete_inode = affs_delete_inode,
121 .clear_inode = affs_clear_inode,
122 .put_super = affs_put_super,
123 .write_super = affs_write_super,
124 .statfs = affs_statfs,
125 .remount_fs = affs_remount,
126};
127
128enum {
129 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
130 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
131 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
132};
133
134static match_table_t tokens = {
135 {Opt_bs, "bs=%u"},
136 {Opt_mode, "mode=%o"},
137 {Opt_mufs, "mufs"},
138 {Opt_prefix, "prefix=%s"},
139 {Opt_protect, "protect"},
140 {Opt_reserved, "reserved=%u"},
141 {Opt_root, "root=%u"},
142 {Opt_setgid, "setgid=%u"},
143 {Opt_setuid, "setuid=%u"},
144 {Opt_verbose, "verbose"},
145 {Opt_volume, "volume=%s"},
146 {Opt_ignore, "grpquota"},
147 {Opt_ignore, "noquota"},
148 {Opt_ignore, "quota"},
149 {Opt_ignore, "usrquota"},
150 {Opt_err, NULL},
151};
152
153static int
154parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
155 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
156{
157 char *p;
158 substring_t args[MAX_OPT_ARGS];
159
160 /* Fill in defaults */
161
162 *uid = current->uid;
163 *gid = current->gid;
164 *reserved = 2;
165 *root = -1;
166 *blocksize = -1;
167 volume[0] = ':';
168 volume[1] = 0;
169 *mount_opts = 0;
170 if (!options)
171 return 1;
172
173 while ((p = strsep(&options, ",")) != NULL) {
174 int token, n, option;
175 if (!*p)
176 continue;
177
178 token = match_token(p, tokens, args);
179 switch (token) {
180 case Opt_bs:
181 if (match_int(&args[0], &n))
182 return -EINVAL;
183 if (n != 512 && n != 1024 && n != 2048
184 && n != 4096) {
185 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
186 return 0;
187 }
188 *blocksize = n;
189 break;
190 case Opt_mode:
191 if (match_octal(&args[0], &option))
192 return 1;
193 *mode = option & 0777;
194 *mount_opts |= SF_SETMODE;
195 break;
196 case Opt_mufs:
197 *mount_opts |= SF_MUFS;
198 break;
199 case Opt_prefix:
f99d49ad
JJ		 200 /* Free any previous prefix */
201 kfree(*prefix);
202 *prefix = NULL;
1da177e4
LT		 203 *prefix = match_strdup(&args[0]);
204 if (!*prefix)
205 return 0;
206 *mount_opts |= SF_PREFIX;
207 break;
208 case Opt_protect:
209 *mount_opts |= SF_IMMUTABLE;
210 break;
211 case Opt_reserved:
212 if (match_int(&args[0], reserved))
213 return 1;
214 break;
215 case Opt_root:
216 if (match_int(&args[0], root))
217 return 1;
218 break;
219 case Opt_setgid:
220 if (match_int(&args[0], &option))
221 return 1;
222 *gid = option;
223 *mount_opts |= SF_SETGID;
224 break;
225 case Opt_setuid:
226 if (match_int(&args[0], &option))
227 return -EINVAL;
228 *uid = option;
229 *mount_opts |= SF_SETUID;
230 break;
231 case Opt_verbose:
232 *mount_opts |= SF_VERBOSE;
233 break;
234 case Opt_volume: {
235 char *vol = match_strdup(&args[0]);
236 strlcpy(volume, vol, 32);
237 kfree(vol);
238 break;
239 }
240 case Opt_ignore:
241 /* Silently ignore the quota options */
242 break;
243 default:
244 printk("AFFS: Unrecognized mount option \"%s\" "
245 "or missing value\n", p);
246 return 0;
247 }
248 }
249 return 1;
250}
251
252/* This function definitely needs to be split up. Some fine day I'll
253 * hopefully have the guts to do so. Until then: sorry for the mess.
254 */
255
256static int affs_fill_super(struct super_block *sb, void *data, int silent)
257{
258 struct affs_sb_info *sbi;
259 struct buffer_head *root_bh = NULL;
260 struct buffer_head *boot_bh;
261 struct inode *root_inode = NULL;
262 s32 root_block;
263 int size, blocksize;
264 u32 chksum;
265 int num_bm;
266 int i, j;
267 s32 key;
268 uid_t uid;
269 gid_t gid;
270 int reserved;
271 unsigned long mount_flags;
272 int tmp_flags; /* fix remount prototype... */
273
274 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
275
276 sb->s_magic = AFFS_SUPER_MAGIC;
277 sb->s_op = &affs_sops;
278 sb->s_flags |= MS_NODIRATIME;
279
280 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
281 if (!sbi)
282 return -ENOMEM;
283 sb->s_fs_info = sbi;
284 memset(sbi, 0, sizeof(*sbi));
285 init_MUTEX(&sbi->s_bmlock);
286
287 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
288 &blocksize,&sbi->s_prefix,
289 sbi->s_volume, &mount_flags)) {
290 printk(KERN_ERR "AFFS: Error parsing options\n");
291 return -EINVAL;
292 }
293 /* N.B. after this point s_prefix must be released */
294
295 sbi->s_flags = mount_flags;
296 sbi->s_mode = i;
297 sbi->s_uid = uid;
298 sbi->s_gid = gid;
299 sbi->s_reserved= reserved;
300
301 /* Get the size of the device in 512-byte blocks.
302 * If we later see that the partition uses bigger
303 * blocks, we will have to change it.
304 */
305
306 size = sb->s_bdev->bd_inode->i_size >> 9;
307 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
308
309 affs_set_blocksize(sb, PAGE_SIZE);
310 /* Try to find root block. Its location depends on the block size. */
311
312 i = 512;
313 j = 4096;
314 if (blocksize > 0) {
315 i = j = blocksize;
316 size = size / (blocksize / 512);
317 }
318 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
319 sbi->s_root_block = root_block;
320 if (root_block < 0)
321 sbi->s_root_block = (reserved + size - 1) / 2;
322 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
323 affs_set_blocksize(sb, blocksize);
324 sbi->s_partition_size = size;
325
326 /* The root block location that was calculated above is not
327 * correct if the partition size is an odd number of 512-
328 * byte blocks, which will be rounded down to a number of
329 * 1024-byte blocks, and if there were an even number of
330 * reserved blocks. Ideally, all partition checkers should
331 * report the real number of blocks of the real blocksize,
332 * but since this just cannot be done, we have to try to
333 * find the root block anyways. In the above case, it is one
334 * block behind the calculated one. So we check this one, too.
335 */
336 for (num_bm = 0; num_bm < 2; num_bm++) {
337 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
338 "size=%d, reserved=%d\n",
339 sb->s_id,
340 sbi->s_root_block + num_bm,
341 blocksize, size, reserved);
342 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
343 if (!root_bh)
344 continue;
345 if (!affs_checksum_block(sb, root_bh) &&
346 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
347 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
348 sbi->s_hashsize = blocksize / 4 - 56;
349 sbi->s_root_block += num_bm;
350 key = 1;
351 goto got_root;
352 }
353 affs_brelse(root_bh);
354 root_bh = NULL;
355 }
356 }
357 if (!silent)
358 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
359 sb->s_id);
360 goto out_error;
361
362 /* N.B. after this point bh must be released */
363got_root:
364 root_block = sbi->s_root_block;
365
366 /* Find out which kind of FS we have */
367 boot_bh = sb_bread(sb, 0);
368 if (!boot_bh) {
369 printk(KERN_ERR "AFFS: Cannot read boot block\n");
370 goto out_error;
371 }
372 chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data);
373 brelse(boot_bh);
374
375 /* Dircache filesystems are compatible with non-dircache ones
376 * when reading. As long as they aren't supported, writing is
377 * not recommended.
378 */
379 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
380 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
381 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
382 sb->s_id);
383 sb->s_flags |= MS_RDONLY;
384 }
385 switch (chksum) {
386 case MUFS_FS:
387 case MUFS_INTLFFS:
388 case MUFS_DCFFS:
389 sbi->s_flags |= SF_MUFS;
390 /* fall thru */
391 case FS_INTLFFS:
392 case FS_DCFFS:
393 sbi->s_flags |= SF_INTL;
394 break;
395 case MUFS_FFS:
396 sbi->s_flags |= SF_MUFS;
397 break;
398 case FS_FFS:
399 break;
400 case MUFS_OFS:
401 sbi->s_flags |= SF_MUFS;
402 /* fall thru */
403 case FS_OFS:
404 sbi->s_flags |= SF_OFS;
405 sb->s_flags |= MS_NOEXEC;
406 break;
407 case MUFS_DCOFS:
408 case MUFS_INTLOFS:
409 sbi->s_flags |= SF_MUFS;
410 case FS_DCOFS:
411 case FS_INTLOFS:
412 sbi->s_flags |= SF_INTL | SF_OFS;
413 sb->s_flags |= MS_NOEXEC;
414 break;
415 default:
416 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
417 sb->s_id, chksum);
418 goto out_error;
419 }
420
421 if (mount_flags & SF_VERBOSE) {
422 chksum = cpu_to_be32(chksum);
423 printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
424 AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
425 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
426 (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
427 }
428
429 sb->s_flags |= MS_NODEV | MS_NOSUID;
430
431 sbi->s_data_blksize = sb->s_blocksize;
432 if (sbi->s_flags & SF_OFS)
433 sbi->s_data_blksize -= 24;
434
435 /* Keep super block in cache */
436 sbi->s_root_bh = root_bh;
437 /* N.B. after this point s_root_bh must be released */
438
439 tmp_flags = sb->s_flags;
440 if (affs_init_bitmap(sb, &tmp_flags))
441 goto out_error;
442 sb->s_flags = tmp_flags;
443
444 /* set up enough so that it can read an inode */
445
446 root_inode = iget(sb, root_block);
447 sb->s_root = d_alloc_root(root_inode);
448 if (!sb->s_root) {
449 printk(KERN_ERR "AFFS: Get root inode failed\n");
450 goto out_error;
451 }
452 sb->s_root->d_op = &affs_dentry_operations;
453
454 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
455 return 0;
456
457 /*
458 * Begin the cascaded cleanup ...
459 */
460out_error:
461 if (root_inode)
462 iput(root_inode);
f99d49ad 463 kfree(sbi->s_bitmap);
1da177e4 464 affs_brelse(root_bh);
f99d49ad 465 kfree(sbi->s_prefix);
1da177e4
LT		 466 kfree(sbi);
467 sb->s_fs_info = NULL;
468 return -EINVAL;
469}
470
471static int
472affs_remount(struct super_block *sb, int *flags, char *data)
473{
474 struct affs_sb_info *sbi = AFFS_SB(sb);
475 int blocksize;
476 uid_t uid;
477 gid_t gid;
478 int mode;
479 int reserved;
480 int root_block;
481 unsigned long mount_flags;
482 int res = 0;
483
484 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
485
486 *flags |= MS_NODIRATIME;
487
488 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
489 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
490 return -EINVAL;
491 sbi->s_flags = mount_flags;
492 sbi->s_mode = mode;
493 sbi->s_uid = uid;
494 sbi->s_gid = gid;
495
496 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
497 return 0;
498 if (*flags & MS_RDONLY) {
499 sb->s_dirt = 1;
500 while (sb->s_dirt)
501 affs_write_super(sb);
502 affs_free_bitmap(sb);
503 } else
504 res = affs_init_bitmap(sb, flags);
505
506 return res;
507}
508
509static int
510affs_statfs(struct super_block *sb, struct kstatfs *buf)
511{
512 int free;
513
514 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
515 AFFS_SB(sb)->s_reserved);
516
517 free = affs_count_free_blocks(sb);
518 buf->f_type = AFFS_SUPER_MAGIC;
519 buf->f_bsize = sb->s_blocksize;
520 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
521 buf->f_bfree = free;
522 buf->f_bavail = free;
523 return 0;
524}
525
526static struct super_block *affs_get_sb(struct file_system_type *fs_type,
527 int flags, const char *dev_name, void *data)
528{
529 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super);
530}
531
532static struct file_system_type affs_fs_type = {
533 .owner = THIS_MODULE,
534 .name = "affs",
535 .get_sb = affs_get_sb,
536 .kill_sb = kill_block_super,
537 .fs_flags = FS_REQUIRES_DEV,
538};
539
540static int __init init_affs_fs(void)
541{
542 int err = init_inodecache();
543 if (err)
544 goto out1;
545 err = register_filesystem(&affs_fs_type);
546 if (err)
547 goto out;
548 return 0;
549out:
550 destroy_inodecache();
551out1:
552 return err;
553}
554
555static void __exit exit_affs_fs(void)
556{
557 unregister_filesystem(&affs_fs_type);
558 destroy_inodecache();
559}
560
561MODULE_DESCRIPTION("Amiga filesystem support for Linux");
562MODULE_LICENSE("GPL");
563
564module_init(init_affs_fs)
565module_exit(exit_affs_fs)
kernel source for telekom puls (alcatel/mediatek)