Blame view
fs/romfs/inode.c
15.3 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 |
/* * ROMFS file system, Linux implementation * * Copyright (C) 1997-1999 Janos Farkas <chexum@shadow.banki.hu> * * Using parts of the minix filesystem * Copyright (C) 1991, 1992 Linus Torvalds * * and parts of the affs filesystem additionally * Copyright (C) 1993 Ray Burr * Copyright (C) 1996 Hans-Joachim Widmaier * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Changes * Changed for 2.1.19 modules * Jan 1997 Initial release * Jun 1997 2.1.43+ changes * Proper page locking in readpage * Changed to work with 2.1.45+ fs * Jul 1997 Fixed follow_link * 2.1.47 * lookup shouldn't return -ENOENT * from Horst von Brand: * fail on wrong checksum * double unlock_super was possible * correct namelen for statfs * spotted by Bill Hawes: * readlink shouldn't iput() * Jun 1998 2.1.106 from Avery Pennarun: glibc scandir() * exposed a problem in readdir * 2.1.107 code-freeze spellchecker run * Aug 1998 2.1.118+ VFS changes * Sep 1998 2.1.122 another VFS change (follow_link) * Apr 1999 2.2.7 no more EBADF checking in * lookup/readdir, use ERR_PTR * Jun 1999 2.3.6 d_alloc_root use changed * 2.3.9 clean up usage of ENOENT/negative * dentries in lookup * clean up page flags setting * (error, uptodate, locking) in * in readpage * use init_special_inode for * fifos/sockets (and streamline) in * read_inode, fix _ops table order * Aug 1999 2.3.16 __initfunc() => __init change * Oct 1999 2.3.24 page->owner hack obsoleted * Nov 1999 2.3.27 2.3.25+ page->offset => index change */ /* todo: * - see Documentation/filesystems/romfs.txt * - use allocated, not stack memory for file names? * - considering write access... * - network (tftp) files? * - merge back some _op tables */ /* * Sorry about some optimizations and for some goto's. I just wanted * to squeeze some more bytes out of this code.. :) */ #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/romfs_fs.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/pagemap.h> #include <linux/smp_lock.h> #include <linux/buffer_head.h> #include <linux/vfs.h> #include <asm/uaccess.h> struct romfs_inode_info { unsigned long i_metasize; /* size of non-data area */ unsigned long i_dataoffset; /* from the start of fs */ struct inode vfs_inode; }; |
78cc91200 iget: stop ROMFS ... |
86 |
static struct inode *romfs_iget(struct super_block *, unsigned long); |
1da177e4c Linux-2.6.12-rc2 |
87 88 89 90 91 92 93 94 |
/* instead of private superblock data */ static inline unsigned long romfs_maxsize(struct super_block *sb) { return (unsigned long)sb->s_fs_info; } static inline struct romfs_inode_info *ROMFS_I(struct inode *inode) { |
55ca3e796 fs/romfs/inode.c:... |
95 |
return container_of(inode, struct romfs_inode_info, vfs_inode); |
1da177e4c Linux-2.6.12-rc2 |
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 |
} static __u32 romfs_checksum(void *data, int size) { __u32 sum; __be32 *ptr; sum = 0; ptr = data; size>>=2; while (size>0) { sum += be32_to_cpu(*ptr++); size--; } return sum; } |
ee9b6d61a [PATCH] Mark stru... |
112 |
static const struct super_operations romfs_ops; |
1da177e4c Linux-2.6.12-rc2 |
113 114 115 116 117 118 |
static int romfs_fill_super(struct super_block *s, void *data, int silent) { struct buffer_head *bh; struct romfs_super_block *rsb; struct inode *root; |
78cc91200 iget: stop ROMFS ... |
119 |
int sz, ret = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 |
/* I would parse the options here, but there are none.. :) */ sb_set_blocksize(s, ROMBSIZE); s->s_maxbytes = 0xFFFFFFFF; bh = sb_bread(s, 0); if (!bh) { /* XXX merge with other printk? */ printk ("romfs: unable to read superblock "); goto outnobh; } rsb = (struct romfs_super_block *)bh->b_data; sz = be32_to_cpu(rsb->size); if (rsb->word0 != ROMSB_WORD0 || rsb->word1 != ROMSB_WORD1 || sz < ROMFH_SIZE) { if (!silent) printk ("VFS: Can't find a romfs filesystem on dev " "%s. ", s->s_id); goto out; } if (romfs_checksum(rsb, min_t(int, sz, 512))) { printk ("romfs: bad initial checksum on dev " "%s. ", s->s_id); goto out; } s->s_magic = ROMFS_MAGIC; s->s_fs_info = (void *)(long)sz; s->s_flags |= MS_RDONLY; /* Find the start of the fs */ sz = (ROMFH_SIZE + strnlen(rsb->name, ROMFS_MAXFN) + 1 + ROMFH_PAD) & ROMFH_MASK; s->s_op = &romfs_ops; |
78cc91200 iget: stop ROMFS ... |
162 163 164 |
root = romfs_iget(s, sz); if (IS_ERR(root)) { ret = PTR_ERR(root); |
1da177e4c Linux-2.6.12-rc2 |
165 |
goto out; |
78cc91200 iget: stop ROMFS ... |
166 |
} |
1da177e4c Linux-2.6.12-rc2 |
167 |
|
78cc91200 iget: stop ROMFS ... |
168 |
ret = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
169 170 171 172 173 174 175 176 177 178 179 180 |
s->s_root = d_alloc_root(root); if (!s->s_root) goto outiput; brelse(bh); return 0; outiput: iput(root); out: brelse(bh); outnobh: |
78cc91200 iget: stop ROMFS ... |
181 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
182 183 184 185 186 |
} /* That's simple too. */ static int |
726c33422 [PATCH] VFS: Perm... |
187 |
romfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4c Linux-2.6.12-rc2 |
188 189 190 191 |
{ buf->f_type = ROMFS_MAGIC; buf->f_bsize = ROMBSIZE; buf->f_bfree = buf->f_bavail = buf->f_ffree; |
726c33422 [PATCH] VFS: Perm... |
192 |
buf->f_blocks = (romfs_maxsize(dentry->d_sb)+ROMBSIZE-1)>>ROMBSBITS; |
1da177e4c Linux-2.6.12-rc2 |
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 |
buf->f_namelen = ROMFS_MAXFN; return 0; } /* some helper routines */ static int romfs_strnlen(struct inode *i, unsigned long offset, unsigned long count) { struct buffer_head *bh; unsigned long avail, maxsize, res; maxsize = romfs_maxsize(i->i_sb); if (offset >= maxsize) return -1; /* strnlen is almost always valid */ if (count > maxsize || offset+count > maxsize) count = maxsize-offset; bh = sb_bread(i->i_sb, offset>>ROMBSBITS); if (!bh) return -1; /* error */ avail = ROMBSIZE - (offset & ROMBMASK); maxsize = min_t(unsigned long, count, avail); res = strnlen(((char *)bh->b_data)+(offset&ROMBMASK), maxsize); brelse(bh); if (res < maxsize) return res; /* found all of it */ while (res < count) { offset += maxsize; bh = sb_bread(i->i_sb, offset>>ROMBSBITS); if (!bh) return -1; maxsize = min_t(unsigned long, count - res, ROMBSIZE); avail = strnlen(bh->b_data, maxsize); res += avail; brelse(bh); if (avail < maxsize) return res; } return res; } static int romfs_copyfrom(struct inode *i, void *dest, unsigned long offset, unsigned long count) { struct buffer_head *bh; unsigned long avail, maxsize, res; maxsize = romfs_maxsize(i->i_sb); if (offset >= maxsize || count > maxsize || offset+count>maxsize) return -1; bh = sb_bread(i->i_sb, offset>>ROMBSBITS); if (!bh) return -1; /* error */ avail = ROMBSIZE - (offset & ROMBMASK); maxsize = min_t(unsigned long, count, avail); memcpy(dest, ((char *)bh->b_data) + (offset & ROMBMASK), maxsize); brelse(bh); res = maxsize; /* all of it */ while (res < count) { offset += maxsize; dest += maxsize; bh = sb_bread(i->i_sb, offset>>ROMBSBITS); if (!bh) return -1; maxsize = min_t(unsigned long, count - res, ROMBSIZE); memcpy(dest, bh->b_data, maxsize); brelse(bh); res += maxsize; } return res; } static unsigned char romfs_dtype_table[] = { DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_SOCK, DT_FIFO }; static int romfs_readdir(struct file *filp, void *dirent, filldir_t filldir) { |
3027795e7 [PATCH] struct pa... |
284 |
struct inode *i = filp->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 |
struct romfs_inode ri; unsigned long offset, maxoff; int j, ino, nextfh; int stored = 0; char fsname[ROMFS_MAXFN]; /* XXX dynamic? */ lock_kernel(); maxoff = romfs_maxsize(i->i_sb); offset = filp->f_pos; if (!offset) { offset = i->i_ino & ROMFH_MASK; if (romfs_copyfrom(i, &ri, offset, ROMFH_SIZE) <= 0) goto out; offset = be32_to_cpu(ri.spec) & ROMFH_MASK; } /* Not really failsafe, but we are read-only... */ for(;;) { if (!offset || offset >= maxoff) { offset = maxoff; filp->f_pos = offset; goto out; } filp->f_pos = offset; /* Fetch inode info */ if (romfs_copyfrom(i, &ri, offset, ROMFH_SIZE) <= 0) goto out; j = romfs_strnlen(i, offset+ROMFH_SIZE, sizeof(fsname)-1); if (j < 0) goto out; fsname[j]=0; romfs_copyfrom(i, fsname, offset+ROMFH_SIZE, j); ino = offset; nextfh = be32_to_cpu(ri.next); if ((nextfh & ROMFH_TYPE) == ROMFH_HRD) ino = be32_to_cpu(ri.spec); if (filldir(dirent, fsname, j, offset, ino, romfs_dtype_table[nextfh & ROMFH_TYPE]) < 0) { goto out; } stored++; offset = nextfh & ROMFH_MASK; } out: unlock_kernel(); return stored; } static struct dentry * romfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { unsigned long offset, maxoff; |
4ebf89845 ROMFS: Fix up an ... |
343 344 345 |
long res; int fslen; struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
346 347 348 349 350 351 352 353 354 |
char fsname[ROMFS_MAXFN]; /* XXX dynamic? */ struct romfs_inode ri; const char *name; /* got from dentry */ int len; res = -EACCES; /* placeholder for "no data here" */ offset = dir->i_ino & ROMFH_MASK; lock_kernel(); if (romfs_copyfrom(dir, &ri, offset, ROMFH_SIZE) <= 0) |
4ebf89845 ROMFS: Fix up an ... |
355 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
356 357 358 359 360 361 362 363 364 365 366 367 |
maxoff = romfs_maxsize(dir->i_sb); offset = be32_to_cpu(ri.spec) & ROMFH_MASK; /* OK, now find the file whose name is in "dentry" in the * directory specified by "dir". */ name = dentry->d_name.name; len = dentry->d_name.len; for(;;) { if (!offset || offset >= maxoff) |
4ebf89845 ROMFS: Fix up an ... |
368 |
goto success; /* negative success */ |
1da177e4c Linux-2.6.12-rc2 |
369 |
if (romfs_copyfrom(dir, &ri, offset, ROMFH_SIZE) <= 0) |
4ebf89845 ROMFS: Fix up an ... |
370 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 |
/* try to match the first 16 bytes of name */ fslen = romfs_strnlen(dir, offset+ROMFH_SIZE, ROMFH_SIZE); if (len < ROMFH_SIZE) { if (len == fslen) { /* both are shorter, and same size */ romfs_copyfrom(dir, fsname, offset+ROMFH_SIZE, len+1); if (strncmp (name, fsname, len) == 0) break; } } else if (fslen >= ROMFH_SIZE) { /* both are longer; XXX optimize max size */ fslen = romfs_strnlen(dir, offset+ROMFH_SIZE, sizeof(fsname)-1); if (len == fslen) { romfs_copyfrom(dir, fsname, offset+ROMFH_SIZE, len+1); if (strncmp(name, fsname, len) == 0) break; } } /* next entry */ offset = be32_to_cpu(ri.next) & ROMFH_MASK; } /* Hard link handling */ if ((be32_to_cpu(ri.next) & ROMFH_TYPE) == ROMFH_HRD) offset = be32_to_cpu(ri.spec) & ROMFH_MASK; |
78cc91200 iget: stop ROMFS ... |
397 398 399 |
inode = romfs_iget(dir->i_sb, offset); if (IS_ERR(inode)) { res = PTR_ERR(inode); |
4ebf89845 ROMFS: Fix up an ... |
400 |
goto error; |
78cc91200 iget: stop ROMFS ... |
401 |
} |
1da177e4c Linux-2.6.12-rc2 |
402 |
|
4ebf89845 ROMFS: Fix up an ... |
403 404 |
success: d_add(dentry, inode); |
78cc91200 iget: stop ROMFS ... |
405 |
res = 0; |
4ebf89845 ROMFS: Fix up an ... |
406 407 |
error: unlock_kernel(); |
1da177e4c Linux-2.6.12-rc2 |
408 409 410 411 412 413 414 415 416 417 418 419 |
return ERR_PTR(res); } /* * Ok, we do readpage, to be able to execute programs. Unfortunately, * we can't use bmap, since we may have looser alignments. */ static int romfs_readpage(struct file *file, struct page * page) { struct inode *inode = page->mapping->host; |
54b21a799 [PATCH] fix possi... |
420 |
loff_t offset, avail, readlen; |
1da177e4c Linux-2.6.12-rc2 |
421 422 423 424 425 426 427 428 429 430 |
void *buf; int result = -EIO; page_cache_get(page); lock_kernel(); buf = kmap(page); if (!buf) goto err_out; /* 32 bit warning -- but not for us :) */ |
54b21a799 [PATCH] fix possi... |
431 432 |
offset = page_offset(page); if (offset < i_size_read(inode)) { |
1da177e4c Linux-2.6.12-rc2 |
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 |
avail = inode->i_size-offset; readlen = min_t(unsigned long, avail, PAGE_SIZE); if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) { if (readlen < PAGE_SIZE) { memset(buf + readlen,0,PAGE_SIZE-readlen); } SetPageUptodate(page); result = 0; } } if (result) { memset(buf, 0, PAGE_SIZE); SetPageError(page); } flush_dcache_page(page); unlock_page(page); kunmap(page); err_out: page_cache_release(page); unlock_kernel(); return result; } /* Mapping from our types to the kernel */ |
f5e54d6e5 [PATCH] mark addr... |
460 |
static const struct address_space_operations romfs_aops = { |
1da177e4c Linux-2.6.12-rc2 |
461 462 |
.readpage = romfs_readpage }; |
4b6f5d20b [PATCH] Make most... |
463 |
static const struct file_operations romfs_dir_operations = { |
1da177e4c Linux-2.6.12-rc2 |
464 465 466 |
.read = generic_read_dir, .readdir = romfs_readdir, }; |
c5ef1c42c [PATCH] mark stru... |
467 |
static const struct inode_operations romfs_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
468 469 470 471 472 473 474 475 |
.lookup = romfs_lookup, }; static mode_t romfs_modemap[] = { 0, S_IFDIR+0644, S_IFREG+0644, S_IFLNK+0777, S_IFBLK+0600, S_IFCHR+0600, S_IFSOCK+0644, S_IFIFO+0644 }; |
78cc91200 iget: stop ROMFS ... |
476 477 |
static struct inode * romfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
478 |
{ |
78cc91200 iget: stop ROMFS ... |
479 |
int nextfh; |
1da177e4c Linux-2.6.12-rc2 |
480 |
struct romfs_inode ri; |
78cc91200 iget: stop ROMFS ... |
481 482 483 484 485 486 487 488 |
struct inode *i; ino &= ROMFH_MASK; i = iget_locked(sb, ino); if (!i) return ERR_PTR(-ENOMEM); if (!(i->i_state & I_NEW)) return i; |
1da177e4c Linux-2.6.12-rc2 |
489 |
|
1da177e4c Linux-2.6.12-rc2 |
490 491 492 493 494 |
i->i_mode = 0; /* Loop for finding the real hard link */ for(;;) { if (romfs_copyfrom(i, &ri, ino, ROMFH_SIZE) <= 0) { |
78cc91200 iget: stop ROMFS ... |
495 496 497 498 499 |
printk(KERN_ERR "romfs: read error for inode 0x%lx ", ino); iget_failed(i); return ERR_PTR(-EIO); |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 |
} /* XXX: do romfs_checksum here too (with name) */ nextfh = be32_to_cpu(ri.next); if ((nextfh & ROMFH_TYPE) != ROMFH_HRD) break; ino = be32_to_cpu(ri.spec) & ROMFH_MASK; } i->i_nlink = 1; /* Hard to decide.. */ i->i_size = be32_to_cpu(ri.size); i->i_mtime.tv_sec = i->i_atime.tv_sec = i->i_ctime.tv_sec = 0; i->i_mtime.tv_nsec = i->i_atime.tv_nsec = i->i_ctime.tv_nsec = 0; i->i_uid = i->i_gid = 0; /* Precalculate the data offset */ ino = romfs_strnlen(i, ino+ROMFH_SIZE, ROMFS_MAXFN); if (ino >= 0) ino = ((ROMFH_SIZE+ino+1+ROMFH_PAD)&ROMFH_MASK); else ino = 0; ROMFS_I(i)->i_metasize = ino; ROMFS_I(i)->i_dataoffset = ino+(i->i_ino&ROMFH_MASK); /* Compute permissions */ ino = romfs_modemap[nextfh & ROMFH_TYPE]; /* only "normal" files have ops */ switch (nextfh & ROMFH_TYPE) { case 1: i->i_size = ROMFS_I(i)->i_metasize; i->i_op = &romfs_dir_inode_operations; i->i_fop = &romfs_dir_operations; if (nextfh & ROMFH_EXEC) ino |= S_IXUGO; i->i_mode = ino; break; case 2: i->i_fop = &generic_ro_fops; i->i_data.a_ops = &romfs_aops; if (nextfh & ROMFH_EXEC) ino |= S_IXUGO; i->i_mode = ino; break; case 3: i->i_op = &page_symlink_inode_operations; i->i_data.a_ops = &romfs_aops; i->i_mode = ino | S_IRWXUGO; break; default: /* depending on MBZ for sock/fifos */ nextfh = be32_to_cpu(ri.spec); init_special_inode(i, ino, MKDEV(nextfh>>16,nextfh&0xffff)); } |
78cc91200 iget: stop ROMFS ... |
556 557 |
unlock_new_inode(i); return i; |
1da177e4c Linux-2.6.12-rc2 |
558 |
} |
e18b890bb [PATCH] slab: rem... |
559 |
static struct kmem_cache * romfs_inode_cachep; |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 |
static struct inode *romfs_alloc_inode(struct super_block *sb) { struct romfs_inode_info *ei; |
55ca3e796 fs/romfs/inode.c:... |
564 |
ei = kmem_cache_alloc(romfs_inode_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 568 569 570 571 572 573 |
if (!ei) return NULL; return &ei->vfs_inode; } static void romfs_destroy_inode(struct inode *inode) { kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode)); } |
4ba9b9d0b Slab API: remove ... |
574 |
static void init_once(struct kmem_cache *cachep, void *foo) |
1da177e4c Linux-2.6.12-rc2 |
575 |
{ |
a35afb830 Remove SLAB_CTOR_... |
576 |
struct romfs_inode_info *ei = foo; |
1da177e4c Linux-2.6.12-rc2 |
577 |
|
a35afb830 Remove SLAB_CTOR_... |
578 |
inode_init_once(&ei->vfs_inode); |
1da177e4c Linux-2.6.12-rc2 |
579 |
} |
20c2df83d mm: Remove slab d... |
580 |
|
1da177e4c Linux-2.6.12-rc2 |
581 582 583 584 |
static int init_inodecache(void) { romfs_inode_cachep = kmem_cache_create("romfs_inode_cache", sizeof(struct romfs_inode_info), |
fffb60f93 [PATCH] cpuset me... |
585 586 |
0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), |
20c2df83d mm: Remove slab d... |
587 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
588 589 590 591 592 593 594 |
if (romfs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { |
1a1d92c10 [PATCH] Really ig... |
595 |
kmem_cache_destroy(romfs_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 600 601 602 |
} static int romfs_remount(struct super_block *sb, int *flags, char *data) { *flags |= MS_RDONLY; return 0; } |
ee9b6d61a [PATCH] Mark stru... |
603 |
static const struct super_operations romfs_ops = { |
1da177e4c Linux-2.6.12-rc2 |
604 605 |
.alloc_inode = romfs_alloc_inode, .destroy_inode = romfs_destroy_inode, |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 |
.statfs = romfs_statfs, .remount_fs = romfs_remount, }; |
454e2398b [PATCH] VFS: Perm... |
609 610 |
static int romfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
1da177e4c Linux-2.6.12-rc2 |
611 |
{ |
454e2398b [PATCH] VFS: Perm... |
612 613 |
return get_sb_bdev(fs_type, flags, dev_name, data, romfs_fill_super, mnt); |
1da177e4c Linux-2.6.12-rc2 |
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 |
} static struct file_system_type romfs_fs_type = { .owner = THIS_MODULE, .name = "romfs", .get_sb = romfs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; static int __init init_romfs_fs(void) { int err = init_inodecache(); if (err) goto out1; err = register_filesystem(&romfs_fs_type); if (err) goto out; return 0; out: destroy_inodecache(); out1: return err; } static void __exit exit_romfs_fs(void) { unregister_filesystem(&romfs_fs_type); destroy_inodecache(); } /* Yes, works even as a module... :) */ module_init(init_romfs_fs) module_exit(exit_romfs_fs) MODULE_LICENSE("GPL"); |