2 * linux/fs/affs/amigaffs.c
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Amiga FFS filesystem.
8 * Please send bug reports to: hjw@zvw.de
12 #include <linux/stat.h>
13 #include <linux/time.h>
14 #include <linux/affs_fs.h>
15 #include <linux/string.h>
17 #include <linux/amigaffs.h>
18 #include <linux/buffer_head.h>
20 extern struct timezone sys_tz;
22 static char ErrorBuffer[256];
25 * Functions for accessing Amiga-FFS structures.
29 /* Insert a header block bh into the directory dir
30 * caller must hold AFFS_DIR->i_hash_lock!
34 affs_insert_hash(struct inode *dir, struct buffer_head *bh)
36 struct super_block *sb = dir->i_sb;
37 struct buffer_head *dir_bh;
42 offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
44 pr_debug("AFFS: insert_hash(dir=%u, ino=%d)\n", (u32)dir->i_ino, ino);
46 dir_bh = affs_bread(sb, dir->i_ino);
50 hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
53 dir_bh = affs_bread(sb, hash_ino);
56 hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
58 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
59 AFFS_TAIL(sb, bh)->hash_chain = 0;
60 affs_fix_checksum(sb, bh);
62 if (dir->i_ino == dir_bh->b_blocknr)
63 AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
65 AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
67 affs_adjust_checksum(dir_bh, ino);
68 mark_buffer_dirty_inode(dir_bh, dir);
71 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
73 mark_inode_dirty(dir);
78 /* Remove a header block from its directory.
79 * caller must hold AFFS_DIR->i_hash_lock!
83 affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
85 struct super_block *sb;
86 struct buffer_head *bh;
87 u32 rem_ino, hash_ino;
92 rem_ino = rem_bh->b_blocknr;
93 offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
94 pr_debug("AFFS: remove_hash(dir=%d, ino=%d, hashval=%d)\n", (u32)dir->i_ino, rem_ino, offset);
96 bh = affs_bread(sb, dir->i_ino);
101 hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
103 if (hash_ino == rem_ino) {
104 ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
105 if (dir->i_ino == bh->b_blocknr)
106 AFFS_HEAD(bh)->table[offset] = ino;
108 AFFS_TAIL(sb, bh)->hash_chain = ino;
109 affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
110 mark_buffer_dirty_inode(bh, dir);
111 AFFS_TAIL(sb, rem_bh)->parent = 0;
116 bh = affs_bread(sb, hash_ino);
119 hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
124 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
126 mark_inode_dirty(dir);
132 affs_fix_dcache(struct dentry *dentry, u32 entry_ino)
134 struct inode *inode = dentry->d_inode;
135 void *data = dentry->d_fsdata;
136 struct list_head *head, *next;
138 spin_lock(&dcache_lock);
139 head = &inode->i_dentry;
141 while (next != head) {
142 dentry = list_entry(next, struct dentry, d_alias);
143 if (entry_ino == (u32)(long)dentry->d_fsdata) {
144 dentry->d_fsdata = data;
149 spin_unlock(&dcache_lock);
153 /* Remove header from link chain */
156 affs_remove_link(struct dentry *dentry)
158 struct inode *dir, *inode = dentry->d_inode;
159 struct super_block *sb = inode->i_sb;
160 struct buffer_head *bh = NULL, *link_bh = NULL;
164 pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
166 bh = affs_bread(sb, inode->i_ino);
170 link_ino = (u32)(long)dentry->d_fsdata;
171 if (inode->i_ino == link_ino) {
172 /* we can't remove the head of the link, as its blocknr is still used as ino,
173 * so we remove the block of the first link instead.
175 link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
176 link_bh = affs_bread(sb, link_ino);
180 dir = iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
185 affs_fix_dcache(dentry, link_ino);
186 retval = affs_remove_hash(dir, link_bh);
189 mark_buffer_dirty_inode(link_bh, inode);
191 memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
192 retval = affs_insert_hash(dir, bh);
195 mark_buffer_dirty_inode(bh, inode);
197 affs_unlock_dir(dir);
200 link_bh = affs_bread(sb, link_ino);
205 while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
206 if (ino == link_ino) {
207 __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
208 AFFS_TAIL(sb, bh)->link_chain = ino2;
209 affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
210 mark_buffer_dirty_inode(bh, inode);
212 /* Fix the link count, if bh is a normal header block without links */
213 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
218 if (!AFFS_TAIL(sb, bh)->link_chain)
221 affs_free_block(sb, link_ino);
225 bh = affs_bread(sb, ino);
231 affs_brelse(link_bh);
238 affs_empty_dir(struct inode *inode)
240 struct super_block *sb = inode->i_sb;
241 struct buffer_head *bh;
245 bh = affs_bread(sb, inode->i_ino);
250 for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
251 if (AFFS_HEAD(bh)->table[size])
261 /* Remove a filesystem object. If the object to be removed has
262 * links to it, one of the links must be changed to inherit
263 * the file or directory. As above, any inode will do.
264 * The buffer will not be freed. If the header is a link, the
265 * block will be marked as free.
266 * This function returns a negative error number in case of
267 * an error, else 0 if the inode is to be deleted or 1 if not.
271 affs_remove_header(struct dentry *dentry)
273 struct super_block *sb;
274 struct inode *inode, *dir;
275 struct buffer_head *bh = NULL;
278 dir = dentry->d_parent->d_inode;
282 inode = dentry->d_inode;
286 pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
288 bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
292 affs_lock_link(inode);
294 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
296 /* if we ever want to support links to dirs
297 * i_hash_lock of the inode must only be
298 * taken after some checks
300 affs_lock_dir(inode);
301 retval = affs_empty_dir(inode);
302 affs_unlock_dir(inode);
310 retval = affs_remove_hash(dir, bh);
313 mark_buffer_dirty_inode(bh, inode);
315 affs_unlock_dir(dir);
317 if (inode->i_nlink > 1)
318 retval = affs_remove_link(dentry);
321 affs_unlock_link(inode);
322 inode->i_ctime = CURRENT_TIME;
323 mark_inode_dirty(inode);
330 affs_unlock_dir(dir);
331 affs_unlock_link(inode);
335 /* Checksum a block, do various consistency checks and optionally return
336 the blocks type number. DATA points to the block. If their pointers
337 are non-null, *PTYPE and *STYPE are set to the primary and secondary
338 block types respectively, *HASHSIZE is set to the size of the hashtable
339 (which lets us calculate the block size).
340 Returns non-zero if the block is not consistent. */
343 affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
345 __be32 *ptr = (__be32 *)bh->b_data;
350 for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
351 sum += be32_to_cpu(*ptr++);
356 * Calculate the checksum of a disk block and store it
357 * at the indicated position.
361 affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
363 int cnt = sb->s_blocksize / sizeof(__be32);
364 __be32 *ptr = (__be32 *)bh->b_data;
368 checksumptr = ptr + 5;
370 for (checksum = 0; cnt > 0; ptr++, cnt--)
371 checksum += be32_to_cpu(*ptr);
372 *checksumptr = cpu_to_be32(-checksum);
376 secs_to_datestamp(time_t secs, struct affs_date *ds)
381 secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
385 secs -= days * 86400;
389 ds->days = cpu_to_be32(days);
390 ds->mins = cpu_to_be32(minute);
391 ds->ticks = cpu_to_be32(secs * 50);
395 prot_to_mode(u32 prot)
399 if (!(prot & FIBF_NOWRITE))
401 if (!(prot & FIBF_NOREAD))
403 if (!(prot & FIBF_NOEXECUTE))
405 if (prot & FIBF_GRP_WRITE)
407 if (prot & FIBF_GRP_READ)
409 if (prot & FIBF_GRP_EXECUTE)
411 if (prot & FIBF_OTR_WRITE)
413 if (prot & FIBF_OTR_READ)
415 if (prot & FIBF_OTR_EXECUTE)
422 mode_to_prot(struct inode *inode)
424 u32 prot = AFFS_I(inode)->i_protect;
425 mode_t mode = inode->i_mode;
427 if (!(mode & S_IXUSR))
428 prot |= FIBF_NOEXECUTE;
429 if (!(mode & S_IRUSR))
431 if (!(mode & S_IWUSR))
432 prot |= FIBF_NOWRITE;
434 prot |= FIBF_GRP_EXECUTE;
436 prot |= FIBF_GRP_READ;
438 prot |= FIBF_GRP_WRITE;
440 prot |= FIBF_OTR_EXECUTE;
442 prot |= FIBF_OTR_READ;
444 prot |= FIBF_OTR_WRITE;
446 AFFS_I(inode)->i_protect = prot;
450 affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
455 vsprintf(ErrorBuffer,fmt,args);
458 printk(KERN_CRIT "AFFS error (device %s): %s(): %s\n", sb->s_id,
459 function,ErrorBuffer);
460 if (!(sb->s_flags & MS_RDONLY))
461 printk(KERN_WARNING "AFFS: Remounting filesystem read-only\n");
462 sb->s_flags |= MS_RDONLY;
466 affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
471 vsprintf(ErrorBuffer,fmt,args);
474 printk(KERN_WARNING "AFFS warning (device %s): %s(): %s\n", sb->s_id,
475 function,ErrorBuffer);
478 /* Check if the name is valid for a affs object. */
481 affs_check_name(const unsigned char *name, int len)
486 #ifdef AFFS_NO_TRUNCATE
487 return -ENAMETOOLONG;
492 for (i = 0; i < len; i++) {
493 if (name[i] < ' ' || name[i] == ':'
494 || (name[i] > 0x7e && name[i] < 0xa0))
501 /* This function copies name to bstr, with at most 30
502 * characters length. The bstr will be prepended by
504 * NOTE: The name will must be already checked by
509 affs_copy_name(unsigned char *bstr, struct dentry *dentry)
511 int len = min(dentry->d_name.len, 30u);
514 memcpy(bstr, dentry->d_name.name, len);