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TOMOYO Linux Cross Reference
Linux/fs/romfs/super.c

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  1 /* Block- or MTD-based romfs
  2  *
  3  * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * Derived from: ROMFS file system, Linux implementation
  7  *
  8  * Copyright © 1997-1999  Janos Farkas <chexum@shadow.banki.hu>
  9  *
 10  * Using parts of the minix filesystem
 11  * Copyright © 1991, 1992  Linus Torvalds
 12  *
 13  * and parts of the affs filesystem additionally
 14  * Copyright © 1993  Ray Burr
 15  * Copyright © 1996  Hans-Joachim Widmaier
 16  *
 17  * Changes
 18  *                                      Changed for 2.1.19 modules
 19  *      Jan 1997                        Initial release
 20  *      Jun 1997                        2.1.43+ changes
 21  *                                      Proper page locking in readpage
 22  *                                      Changed to work with 2.1.45+ fs
 23  *      Jul 1997                        Fixed follow_link
 24  *                      2.1.47
 25  *                                      lookup shouldn't return -ENOENT
 26  *                                      from Horst von Brand:
 27  *                                        fail on wrong checksum
 28  *                                        double unlock_super was possible
 29  *                                        correct namelen for statfs
 30  *                                      spotted by Bill Hawes:
 31  *                                        readlink shouldn't iput()
 32  *      Jun 1998        2.1.106         from Avery Pennarun: glibc scandir()
 33  *                                        exposed a problem in readdir
 34  *                      2.1.107         code-freeze spellchecker run
 35  *      Aug 1998                        2.1.118+ VFS changes
 36  *      Sep 1998        2.1.122         another VFS change (follow_link)
 37  *      Apr 1999        2.2.7           no more EBADF checking in
 38  *                                        lookup/readdir, use ERR_PTR
 39  *      Jun 1999        2.3.6           d_alloc_root use changed
 40  *                      2.3.9           clean up usage of ENOENT/negative
 41  *                                        dentries in lookup
 42  *                                      clean up page flags setting
 43  *                                        (error, uptodate, locking) in
 44  *                                        in readpage
 45  *                                      use init_special_inode for
 46  *                                        fifos/sockets (and streamline) in
 47  *                                        read_inode, fix _ops table order
 48  *      Aug 1999        2.3.16          __initfunc() => __init change
 49  *      Oct 1999        2.3.24          page->owner hack obsoleted
 50  *      Nov 1999        2.3.27          2.3.25+ page->offset => index change
 51  *
 52  *
 53  * This program is free software; you can redistribute it and/or
 54  * modify it under the terms of the GNU General Public Licence
 55  * as published by the Free Software Foundation; either version
 56  * 2 of the Licence, or (at your option) any later version.
 57  */
 58 
 59 #include <linux/module.h>
 60 #include <linux/string.h>
 61 #include <linux/fs.h>
 62 #include <linux/time.h>
 63 #include <linux/slab.h>
 64 #include <linux/init.h>
 65 #include <linux/blkdev.h>
 66 #include <linux/parser.h>
 67 #include <linux/mount.h>
 68 #include <linux/namei.h>
 69 #include <linux/statfs.h>
 70 #include <linux/mtd/super.h>
 71 #include <linux/ctype.h>
 72 #include <linux/highmem.h>
 73 #include <linux/pagemap.h>
 74 #include <linux/uaccess.h>
 75 #include "internal.h"
 76 
 77 static struct kmem_cache *romfs_inode_cachep;
 78 
 79 static const umode_t romfs_modemap[8] = {
 80         0,                      /* hard link */
 81         S_IFDIR  | 0644,        /* directory */
 82         S_IFREG  | 0644,        /* regular file */
 83         S_IFLNK  | 0777,        /* symlink */
 84         S_IFBLK  | 0600,        /* blockdev */
 85         S_IFCHR  | 0600,        /* chardev */
 86         S_IFSOCK | 0644,        /* socket */
 87         S_IFIFO  | 0644         /* FIFO */
 88 };
 89 
 90 static const unsigned char romfs_dtype_table[] = {
 91         DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_SOCK, DT_FIFO
 92 };
 93 
 94 static struct inode *romfs_iget(struct super_block *sb, unsigned long pos);
 95 
 96 /*
 97  * read a page worth of data from the image
 98  */
 99 static int romfs_readpage(struct file *file, struct page *page)
100 {
101         struct inode *inode = page->mapping->host;
102         loff_t offset, size;
103         unsigned long fillsize, pos;
104         void *buf;
105         int ret;
106 
107         buf = kmap(page);
108         if (!buf)
109                 return -ENOMEM;
110 
111         /* 32 bit warning -- but not for us :) */
112         offset = page_offset(page);
113         size = i_size_read(inode);
114         fillsize = 0;
115         ret = 0;
116         if (offset < size) {
117                 size -= offset;
118                 fillsize = size > PAGE_SIZE ? PAGE_SIZE : size;
119 
120                 pos = ROMFS_I(inode)->i_dataoffset + offset;
121 
122                 ret = romfs_dev_read(inode->i_sb, pos, buf, fillsize);
123                 if (ret < 0) {
124                         SetPageError(page);
125                         fillsize = 0;
126                         ret = -EIO;
127                 }
128         }
129 
130         if (fillsize < PAGE_SIZE)
131                 memset(buf + fillsize, 0, PAGE_SIZE - fillsize);
132         if (ret == 0)
133                 SetPageUptodate(page);
134 
135         flush_dcache_page(page);
136         kunmap(page);
137         unlock_page(page);
138         return ret;
139 }
140 
141 static const struct address_space_operations romfs_aops = {
142         .readpage       = romfs_readpage
143 };
144 
145 /*
146  * read the entries from a directory
147  */
148 static int romfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
149 {
150         struct inode *i = file_inode(filp);
151         struct romfs_inode ri;
152         unsigned long offset, maxoff;
153         int j, ino, nextfh;
154         int stored = 0;
155         char fsname[ROMFS_MAXFN];       /* XXX dynamic? */
156         int ret;
157 
158         maxoff = romfs_maxsize(i->i_sb);
159 
160         offset = filp->f_pos;
161         if (!offset) {
162                 offset = i->i_ino & ROMFH_MASK;
163                 ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
164                 if (ret < 0)
165                         goto out;
166                 offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
167         }
168 
169         /* Not really failsafe, but we are read-only... */
170         for (;;) {
171                 if (!offset || offset >= maxoff) {
172                         offset = maxoff;
173                         filp->f_pos = offset;
174                         goto out;
175                 }
176                 filp->f_pos = offset;
177 
178                 /* Fetch inode info */
179                 ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
180                 if (ret < 0)
181                         goto out;
182 
183                 j = romfs_dev_strnlen(i->i_sb, offset + ROMFH_SIZE,
184                                       sizeof(fsname) - 1);
185                 if (j < 0)
186                         goto out;
187 
188                 ret = romfs_dev_read(i->i_sb, offset + ROMFH_SIZE, fsname, j);
189                 if (ret < 0)
190                         goto out;
191                 fsname[j] = '\0';
192 
193                 ino = offset;
194                 nextfh = be32_to_cpu(ri.next);
195                 if ((nextfh & ROMFH_TYPE) == ROMFH_HRD)
196                         ino = be32_to_cpu(ri.spec);
197                 if (filldir(dirent, fsname, j, offset, ino,
198                             romfs_dtype_table[nextfh & ROMFH_TYPE]) < 0)
199                         goto out;
200 
201                 stored++;
202                 offset = nextfh & ROMFH_MASK;
203         }
204 
205 out:
206         return stored;
207 }
208 
209 /*
210  * look up an entry in a directory
211  */
212 static struct dentry *romfs_lookup(struct inode *dir, struct dentry *dentry,
213                                    unsigned int flags)
214 {
215         unsigned long offset, maxoff;
216         struct inode *inode;
217         struct romfs_inode ri;
218         const char *name;               /* got from dentry */
219         int len, ret;
220 
221         offset = dir->i_ino & ROMFH_MASK;
222         ret = romfs_dev_read(dir->i_sb, offset, &ri, ROMFH_SIZE);
223         if (ret < 0)
224                 goto error;
225 
226         /* search all the file entries in the list starting from the one
227          * pointed to by the directory's special data */
228         maxoff = romfs_maxsize(dir->i_sb);
229         offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
230 
231         name = dentry->d_name.name;
232         len = dentry->d_name.len;
233 
234         for (;;) {
235                 if (!offset || offset >= maxoff)
236                         goto out0;
237 
238                 ret = romfs_dev_read(dir->i_sb, offset, &ri, sizeof(ri));
239                 if (ret < 0)
240                         goto error;
241 
242                 /* try to match the first 16 bytes of name */
243                 ret = romfs_dev_strcmp(dir->i_sb, offset + ROMFH_SIZE, name,
244                                        len);
245                 if (ret < 0)
246                         goto error;
247                 if (ret == 1)
248                         break;
249 
250                 /* next entry */
251                 offset = be32_to_cpu(ri.next) & ROMFH_MASK;
252         }
253 
254         /* Hard link handling */
255         if ((be32_to_cpu(ri.next) & ROMFH_TYPE) == ROMFH_HRD)
256                 offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
257 
258         inode = romfs_iget(dir->i_sb, offset);
259         if (IS_ERR(inode)) {
260                 ret = PTR_ERR(inode);
261                 goto error;
262         }
263         goto outi;
264 
265         /*
266          * it's a bit funky, _lookup needs to return an error code
267          * (negative) or a NULL, both as a dentry.  ENOENT should not
268          * be returned, instead we need to create a negative dentry by
269          * d_add(dentry, NULL); and return 0 as no error.
270          * (Although as I see, it only matters on writable file
271          * systems).
272          */
273 out0:
274         inode = NULL;
275 outi:
276         d_add(dentry, inode);
277         ret = 0;
278 error:
279         return ERR_PTR(ret);
280 }
281 
282 static const struct file_operations romfs_dir_operations = {
283         .read           = generic_read_dir,
284         .readdir        = romfs_readdir,
285         .llseek         = default_llseek,
286 };
287 
288 static const struct inode_operations romfs_dir_inode_operations = {
289         .lookup         = romfs_lookup,
290 };
291 
292 /*
293  * get a romfs inode based on its position in the image (which doubles as the
294  * inode number)
295  */
296 static struct inode *romfs_iget(struct super_block *sb, unsigned long pos)
297 {
298         struct romfs_inode_info *inode;
299         struct romfs_inode ri;
300         struct inode *i;
301         unsigned long nlen;
302         unsigned nextfh;
303         int ret;
304         umode_t mode;
305 
306         /* we might have to traverse a chain of "hard link" file entries to get
307          * to the actual file */
308         for (;;) {
309                 ret = romfs_dev_read(sb, pos, &ri, sizeof(ri));
310                 if (ret < 0)
311                         goto error;
312 
313                 /* XXX: do romfs_checksum here too (with name) */
314 
315                 nextfh = be32_to_cpu(ri.next);
316                 if ((nextfh & ROMFH_TYPE) != ROMFH_HRD)
317                         break;
318 
319                 pos = be32_to_cpu(ri.spec) & ROMFH_MASK;
320         }
321 
322         /* determine the length of the filename */
323         nlen = romfs_dev_strnlen(sb, pos + ROMFH_SIZE, ROMFS_MAXFN);
324         if (IS_ERR_VALUE(nlen))
325                 goto eio;
326 
327         /* get an inode for this image position */
328         i = iget_locked(sb, pos);
329         if (!i)
330                 return ERR_PTR(-ENOMEM);
331 
332         if (!(i->i_state & I_NEW))
333                 return i;
334 
335         /* precalculate the data offset */
336         inode = ROMFS_I(i);
337         inode->i_metasize = (ROMFH_SIZE + nlen + 1 + ROMFH_PAD) & ROMFH_MASK;
338         inode->i_dataoffset = pos + inode->i_metasize;
339 
340         set_nlink(i, 1);                /* Hard to decide.. */
341         i->i_size = be32_to_cpu(ri.size);
342         i->i_mtime.tv_sec = i->i_atime.tv_sec = i->i_ctime.tv_sec = 0;
343         i->i_mtime.tv_nsec = i->i_atime.tv_nsec = i->i_ctime.tv_nsec = 0;
344 
345         /* set up mode and ops */
346         mode = romfs_modemap[nextfh & ROMFH_TYPE];
347 
348         switch (nextfh & ROMFH_TYPE) {
349         case ROMFH_DIR:
350                 i->i_size = ROMFS_I(i)->i_metasize;
351                 i->i_op = &romfs_dir_inode_operations;
352                 i->i_fop = &romfs_dir_operations;
353                 if (nextfh & ROMFH_EXEC)
354                         mode |= S_IXUGO;
355                 break;
356         case ROMFH_REG:
357                 i->i_fop = &romfs_ro_fops;
358                 i->i_data.a_ops = &romfs_aops;
359                 if (i->i_sb->s_mtd)
360                         i->i_data.backing_dev_info =
361                                 i->i_sb->s_mtd->backing_dev_info;
362                 if (nextfh & ROMFH_EXEC)
363                         mode |= S_IXUGO;
364                 break;
365         case ROMFH_SYM:
366                 i->i_op = &page_symlink_inode_operations;
367                 i->i_data.a_ops = &romfs_aops;
368                 mode |= S_IRWXUGO;
369                 break;
370         default:
371                 /* depending on MBZ for sock/fifos */
372                 nextfh = be32_to_cpu(ri.spec);
373                 init_special_inode(i, mode, MKDEV(nextfh >> 16,
374                                                   nextfh & 0xffff));
375                 break;
376         }
377 
378         i->i_mode = mode;
379 
380         unlock_new_inode(i);
381         return i;
382 
383 eio:
384         ret = -EIO;
385 error:
386         printk(KERN_ERR "ROMFS: read error for inode 0x%lx\n", pos);
387         return ERR_PTR(ret);
388 }
389 
390 /*
391  * allocate a new inode
392  */
393 static struct inode *romfs_alloc_inode(struct super_block *sb)
394 {
395         struct romfs_inode_info *inode;
396         inode = kmem_cache_alloc(romfs_inode_cachep, GFP_KERNEL);
397         return inode ? &inode->vfs_inode : NULL;
398 }
399 
400 /*
401  * return a spent inode to the slab cache
402  */
403 static void romfs_i_callback(struct rcu_head *head)
404 {
405         struct inode *inode = container_of(head, struct inode, i_rcu);
406         kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode));
407 }
408 
409 static void romfs_destroy_inode(struct inode *inode)
410 {
411         call_rcu(&inode->i_rcu, romfs_i_callback);
412 }
413 
414 /*
415  * get filesystem statistics
416  */
417 static int romfs_statfs(struct dentry *dentry, struct kstatfs *buf)
418 {
419         struct super_block *sb = dentry->d_sb;
420         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
421 
422         buf->f_type = ROMFS_MAGIC;
423         buf->f_namelen = ROMFS_MAXFN;
424         buf->f_bsize = ROMBSIZE;
425         buf->f_bfree = buf->f_bavail = buf->f_ffree;
426         buf->f_blocks =
427                 (romfs_maxsize(dentry->d_sb) + ROMBSIZE - 1) >> ROMBSBITS;
428         buf->f_fsid.val[0] = (u32)id;
429         buf->f_fsid.val[1] = (u32)(id >> 32);
430         return 0;
431 }
432 
433 /*
434  * remounting must involve read-only
435  */
436 static int romfs_remount(struct super_block *sb, int *flags, char *data)
437 {
438         *flags |= MS_RDONLY;
439         return 0;
440 }
441 
442 static const struct super_operations romfs_super_ops = {
443         .alloc_inode    = romfs_alloc_inode,
444         .destroy_inode  = romfs_destroy_inode,
445         .statfs         = romfs_statfs,
446         .remount_fs     = romfs_remount,
447 };
448 
449 /*
450  * checksum check on part of a romfs filesystem
451  */
452 static __u32 romfs_checksum(const void *data, int size)
453 {
454         const __be32 *ptr = data;
455         __u32 sum;
456 
457         sum = 0;
458         size >>= 2;
459         while (size > 0) {
460                 sum += be32_to_cpu(*ptr++);
461                 size--;
462         }
463         return sum;
464 }
465 
466 /*
467  * fill in the superblock
468  */
469 static int romfs_fill_super(struct super_block *sb, void *data, int silent)
470 {
471         struct romfs_super_block *rsb;
472         struct inode *root;
473         unsigned long pos, img_size;
474         const char *storage;
475         size_t len;
476         int ret;
477 
478 #ifdef CONFIG_BLOCK
479         if (!sb->s_mtd) {
480                 sb_set_blocksize(sb, ROMBSIZE);
481         } else {
482                 sb->s_blocksize = ROMBSIZE;
483                 sb->s_blocksize_bits = blksize_bits(ROMBSIZE);
484         }
485 #endif
486 
487         sb->s_maxbytes = 0xFFFFFFFF;
488         sb->s_magic = ROMFS_MAGIC;
489         sb->s_flags |= MS_RDONLY | MS_NOATIME;
490         sb->s_op = &romfs_super_ops;
491 
492         /* read the image superblock and check it */
493         rsb = kmalloc(512, GFP_KERNEL);
494         if (!rsb)
495                 return -ENOMEM;
496 
497         sb->s_fs_info = (void *) 512;
498         ret = romfs_dev_read(sb, 0, rsb, 512);
499         if (ret < 0)
500                 goto error_rsb;
501 
502         img_size = be32_to_cpu(rsb->size);
503 
504         if (sb->s_mtd && img_size > sb->s_mtd->size)
505                 goto error_rsb_inval;
506 
507         sb->s_fs_info = (void *) img_size;
508 
509         if (rsb->word0 != ROMSB_WORD0 || rsb->word1 != ROMSB_WORD1 ||
510             img_size < ROMFH_SIZE) {
511                 if (!silent)
512                         printk(KERN_WARNING "VFS:"
513                                " Can't find a romfs filesystem on dev %s.\n",
514                                sb->s_id);
515                 goto error_rsb_inval;
516         }
517 
518         if (romfs_checksum(rsb, min_t(size_t, img_size, 512))) {
519                 printk(KERN_ERR "ROMFS: bad initial checksum on dev %s.\n",
520                        sb->s_id);
521                 goto error_rsb_inval;
522         }
523 
524         storage = sb->s_mtd ? "MTD" : "the block layer";
525 
526         len = strnlen(rsb->name, ROMFS_MAXFN);
527         if (!silent)
528                 printk(KERN_NOTICE "ROMFS: Mounting image '%*.*s' through %s\n",
529                        (unsigned) len, (unsigned) len, rsb->name, storage);
530 
531         kfree(rsb);
532         rsb = NULL;
533 
534         /* find the root directory */
535         pos = (ROMFH_SIZE + len + 1 + ROMFH_PAD) & ROMFH_MASK;
536 
537         root = romfs_iget(sb, pos);
538         if (IS_ERR(root))
539                 goto error;
540 
541         sb->s_root = d_make_root(root);
542         if (!sb->s_root)
543                 goto error;
544 
545         return 0;
546 
547 error:
548         return -EINVAL;
549 error_rsb_inval:
550         ret = -EINVAL;
551 error_rsb:
552         kfree(rsb);
553         return ret;
554 }
555 
556 /*
557  * get a superblock for mounting
558  */
559 static struct dentry *romfs_mount(struct file_system_type *fs_type,
560                         int flags, const char *dev_name,
561                         void *data)
562 {
563         struct dentry *ret = ERR_PTR(-EINVAL);
564 
565 #ifdef CONFIG_ROMFS_ON_MTD
566         ret = mount_mtd(fs_type, flags, dev_name, data, romfs_fill_super);
567 #endif
568 #ifdef CONFIG_ROMFS_ON_BLOCK
569         if (ret == ERR_PTR(-EINVAL))
570                 ret = mount_bdev(fs_type, flags, dev_name, data,
571                                   romfs_fill_super);
572 #endif
573         return ret;
574 }
575 
576 /*
577  * destroy a romfs superblock in the appropriate manner
578  */
579 static void romfs_kill_sb(struct super_block *sb)
580 {
581 #ifdef CONFIG_ROMFS_ON_MTD
582         if (sb->s_mtd) {
583                 kill_mtd_super(sb);
584                 return;
585         }
586 #endif
587 #ifdef CONFIG_ROMFS_ON_BLOCK
588         if (sb->s_bdev) {
589                 kill_block_super(sb);
590                 return;
591         }
592 #endif
593 }
594 
595 static struct file_system_type romfs_fs_type = {
596         .owner          = THIS_MODULE,
597         .name           = "romfs",
598         .mount          = romfs_mount,
599         .kill_sb        = romfs_kill_sb,
600         .fs_flags       = FS_REQUIRES_DEV,
601 };
602 MODULE_ALIAS_FS("romfs");
603 
604 /*
605  * inode storage initialiser
606  */
607 static void romfs_i_init_once(void *_inode)
608 {
609         struct romfs_inode_info *inode = _inode;
610 
611         inode_init_once(&inode->vfs_inode);
612 }
613 
614 /*
615  * romfs module initialisation
616  */
617 static int __init init_romfs_fs(void)
618 {
619         int ret;
620 
621         printk(KERN_INFO "ROMFS MTD (C) 2007 Red Hat, Inc.\n");
622 
623         romfs_inode_cachep =
624                 kmem_cache_create("romfs_i",
625                                   sizeof(struct romfs_inode_info), 0,
626                                   SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
627                                   romfs_i_init_once);
628 
629         if (!romfs_inode_cachep) {
630                 printk(KERN_ERR
631                        "ROMFS error: Failed to initialise inode cache\n");
632                 return -ENOMEM;
633         }
634         ret = register_filesystem(&romfs_fs_type);
635         if (ret) {
636                 printk(KERN_ERR "ROMFS error: Failed to register filesystem\n");
637                 goto error_register;
638         }
639         return 0;
640 
641 error_register:
642         kmem_cache_destroy(romfs_inode_cachep);
643         return ret;
644 }
645 
646 /*
647  * romfs module removal
648  */
649 static void __exit exit_romfs_fs(void)
650 {
651         unregister_filesystem(&romfs_fs_type);
652         /*
653          * Make sure all delayed rcu free inodes are flushed before we
654          * destroy cache.
655          */
656         rcu_barrier();
657         kmem_cache_destroy(romfs_inode_cachep);
658 }
659 
660 module_init(init_romfs_fs);
661 module_exit(exit_romfs_fs);
662 
663 MODULE_DESCRIPTION("Direct-MTD Capable RomFS");
664 MODULE_AUTHOR("Red Hat, Inc.");
665 MODULE_LICENSE("GPL"); /* Actually dual-licensed, but it doesn't matter for */
666 

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