Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/affs/amigaffs.c |
| 3 | * |
| 4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten |
| 5 | * |
| 6 | * (C) 1993 Ray Burr - Amiga FFS filesystem. |
| 7 | * |
| 8 | * Please send bug reports to: hjw@zvw.de |
| 9 | */ |
| 10 | |
DengChao | db39c16 | 2015-11-12 21:40:41 +0800 | [diff] [blame] | 11 | #include <linux/math64.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include "affs.h" |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | /* |
| 15 | * Functions for accessing Amiga-FFS structures. |
| 16 | */ |
| 17 | |
| 18 | |
| 19 | /* Insert a header block bh into the directory dir |
| 20 | * caller must hold AFFS_DIR->i_hash_lock! |
| 21 | */ |
| 22 | |
| 23 | int |
| 24 | affs_insert_hash(struct inode *dir, struct buffer_head *bh) |
| 25 | { |
| 26 | struct super_block *sb = dir->i_sb; |
| 27 | struct buffer_head *dir_bh; |
| 28 | u32 ino, hash_ino; |
| 29 | int offset; |
| 30 | |
| 31 | ino = bh->b_blocknr; |
| 32 | offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]); |
| 33 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 34 | pr_debug("%s(dir=%lu, ino=%d)\n", __func__, dir->i_ino, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | dir_bh = affs_bread(sb, dir->i_ino); |
| 37 | if (!dir_bh) |
| 38 | return -EIO; |
| 39 | |
| 40 | hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]); |
| 41 | while (hash_ino) { |
| 42 | affs_brelse(dir_bh); |
| 43 | dir_bh = affs_bread(sb, hash_ino); |
| 44 | if (!dir_bh) |
| 45 | return -EIO; |
| 46 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain); |
| 47 | } |
| 48 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); |
| 49 | AFFS_TAIL(sb, bh)->hash_chain = 0; |
| 50 | affs_fix_checksum(sb, bh); |
| 51 | |
| 52 | if (dir->i_ino == dir_bh->b_blocknr) |
| 53 | AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino); |
| 54 | else |
| 55 | AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino); |
| 56 | |
| 57 | affs_adjust_checksum(dir_bh, ino); |
| 58 | mark_buffer_dirty_inode(dir_bh, dir); |
| 59 | affs_brelse(dir_bh); |
| 60 | |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 61 | dir->i_mtime = dir->i_ctime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | dir->i_version++; |
| 63 | mark_inode_dirty(dir); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | /* Remove a header block from its directory. |
| 69 | * caller must hold AFFS_DIR->i_hash_lock! |
| 70 | */ |
| 71 | |
| 72 | int |
| 73 | affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh) |
| 74 | { |
| 75 | struct super_block *sb; |
| 76 | struct buffer_head *bh; |
| 77 | u32 rem_ino, hash_ino; |
| 78 | __be32 ino; |
| 79 | int offset, retval; |
| 80 | |
| 81 | sb = dir->i_sb; |
| 82 | rem_ino = rem_bh->b_blocknr; |
| 83 | offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]); |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 84 | pr_debug("%s(dir=%lu, ino=%d, hashval=%d)\n", __func__, dir->i_ino, |
| 85 | rem_ino, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | bh = affs_bread(sb, dir->i_ino); |
| 88 | if (!bh) |
| 89 | return -EIO; |
| 90 | |
| 91 | retval = -ENOENT; |
| 92 | hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]); |
| 93 | while (hash_ino) { |
| 94 | if (hash_ino == rem_ino) { |
| 95 | ino = AFFS_TAIL(sb, rem_bh)->hash_chain; |
| 96 | if (dir->i_ino == bh->b_blocknr) |
| 97 | AFFS_HEAD(bh)->table[offset] = ino; |
| 98 | else |
| 99 | AFFS_TAIL(sb, bh)->hash_chain = ino; |
| 100 | affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino); |
| 101 | mark_buffer_dirty_inode(bh, dir); |
| 102 | AFFS_TAIL(sb, rem_bh)->parent = 0; |
| 103 | retval = 0; |
| 104 | break; |
| 105 | } |
| 106 | affs_brelse(bh); |
| 107 | bh = affs_bread(sb, hash_ino); |
| 108 | if (!bh) |
| 109 | return -EIO; |
| 110 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain); |
| 111 | } |
| 112 | |
| 113 | affs_brelse(bh); |
| 114 | |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 115 | dir->i_mtime = dir->i_ctime = current_time(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | dir->i_version++; |
| 117 | mark_inode_dirty(dir); |
| 118 | |
| 119 | return retval; |
| 120 | } |
| 121 | |
| 122 | static void |
Al Viro | 12447c4 | 2012-06-09 13:06:09 -0400 | [diff] [blame] | 123 | affs_fix_dcache(struct inode *inode, u32 entry_ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Al Viro | 12447c4 | 2012-06-09 13:06:09 -0400 | [diff] [blame] | 125 | struct dentry *dentry; |
Nick Piggin | 873feea | 2011-01-07 17:50:06 +1100 | [diff] [blame] | 126 | spin_lock(&inode->i_lock); |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 127 | hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | if (entry_ino == (u32)(long)dentry->d_fsdata) { |
Al Viro | 12447c4 | 2012-06-09 13:06:09 -0400 | [diff] [blame] | 129 | dentry->d_fsdata = (void *)inode->i_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | break; |
| 131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
Nick Piggin | 873feea | 2011-01-07 17:50:06 +1100 | [diff] [blame] | 133 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | |
| 137 | /* Remove header from link chain */ |
| 138 | |
| 139 | static int |
| 140 | affs_remove_link(struct dentry *dentry) |
| 141 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 142 | struct inode *dir, *inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | struct super_block *sb = inode->i_sb; |
Fabian Frederick | 4709187 | 2015-06-30 14:57:58 -0700 | [diff] [blame] | 144 | struct buffer_head *bh, *link_bh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | u32 link_ino, ino; |
| 146 | int retval; |
| 147 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 148 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | retval = -EIO; |
| 150 | bh = affs_bread(sb, inode->i_ino); |
| 151 | if (!bh) |
| 152 | goto done; |
| 153 | |
| 154 | link_ino = (u32)(long)dentry->d_fsdata; |
| 155 | if (inode->i_ino == link_ino) { |
| 156 | /* we can't remove the head of the link, as its blocknr is still used as ino, |
| 157 | * so we remove the block of the first link instead. |
| 158 | */ |
| 159 | link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain); |
| 160 | link_bh = affs_bread(sb, link_ino); |
| 161 | if (!link_bh) |
| 162 | goto done; |
| 163 | |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 164 | dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent)); |
| 165 | if (IS_ERR(dir)) { |
| 166 | retval = PTR_ERR(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | goto done; |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | affs_lock_dir(dir); |
Al Viro | 12447c4 | 2012-06-09 13:06:09 -0400 | [diff] [blame] | 171 | /* |
| 172 | * if there's a dentry for that block, make it |
| 173 | * refer to inode itself. |
| 174 | */ |
| 175 | affs_fix_dcache(inode, link_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | retval = affs_remove_hash(dir, link_bh); |
Christoph Hellwig | ec1ab0a | 2008-05-09 12:35:29 +0200 | [diff] [blame] | 177 | if (retval) { |
| 178 | affs_unlock_dir(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | goto done; |
Christoph Hellwig | ec1ab0a | 2008-05-09 12:35:29 +0200 | [diff] [blame] | 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | mark_buffer_dirty_inode(link_bh, inode); |
| 182 | |
| 183 | memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32); |
| 184 | retval = affs_insert_hash(dir, bh); |
Christoph Hellwig | ec1ab0a | 2008-05-09 12:35:29 +0200 | [diff] [blame] | 185 | if (retval) { |
| 186 | affs_unlock_dir(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | goto done; |
Christoph Hellwig | ec1ab0a | 2008-05-09 12:35:29 +0200 | [diff] [blame] | 188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | mark_buffer_dirty_inode(bh, inode); |
| 190 | |
| 191 | affs_unlock_dir(dir); |
| 192 | iput(dir); |
| 193 | } else { |
| 194 | link_bh = affs_bread(sb, link_ino); |
| 195 | if (!link_bh) |
| 196 | goto done; |
| 197 | } |
| 198 | |
| 199 | while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) { |
| 200 | if (ino == link_ino) { |
| 201 | __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain; |
| 202 | AFFS_TAIL(sb, bh)->link_chain = ino2; |
| 203 | affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino); |
| 204 | mark_buffer_dirty_inode(bh, inode); |
| 205 | retval = 0; |
| 206 | /* Fix the link count, if bh is a normal header block without links */ |
| 207 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { |
| 208 | case ST_LINKDIR: |
| 209 | case ST_LINKFILE: |
| 210 | break; |
| 211 | default: |
| 212 | if (!AFFS_TAIL(sb, bh)->link_chain) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 213 | set_nlink(inode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | affs_free_block(sb, link_ino); |
| 216 | goto done; |
| 217 | } |
| 218 | affs_brelse(bh); |
| 219 | bh = affs_bread(sb, ino); |
| 220 | if (!bh) |
| 221 | goto done; |
| 222 | } |
| 223 | retval = -ENOENT; |
| 224 | done: |
| 225 | affs_brelse(link_bh); |
| 226 | affs_brelse(bh); |
| 227 | return retval; |
| 228 | } |
| 229 | |
| 230 | |
| 231 | static int |
| 232 | affs_empty_dir(struct inode *inode) |
| 233 | { |
| 234 | struct super_block *sb = inode->i_sb; |
| 235 | struct buffer_head *bh; |
| 236 | int retval, size; |
| 237 | |
| 238 | retval = -EIO; |
| 239 | bh = affs_bread(sb, inode->i_ino); |
| 240 | if (!bh) |
| 241 | goto done; |
| 242 | |
| 243 | retval = -ENOTEMPTY; |
| 244 | for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--) |
| 245 | if (AFFS_HEAD(bh)->table[size]) |
| 246 | goto not_empty; |
| 247 | retval = 0; |
| 248 | not_empty: |
| 249 | affs_brelse(bh); |
| 250 | done: |
| 251 | return retval; |
| 252 | } |
| 253 | |
| 254 | |
| 255 | /* Remove a filesystem object. If the object to be removed has |
| 256 | * links to it, one of the links must be changed to inherit |
| 257 | * the file or directory. As above, any inode will do. |
| 258 | * The buffer will not be freed. If the header is a link, the |
| 259 | * block will be marked as free. |
| 260 | * This function returns a negative error number in case of |
| 261 | * an error, else 0 if the inode is to be deleted or 1 if not. |
| 262 | */ |
| 263 | |
| 264 | int |
| 265 | affs_remove_header(struct dentry *dentry) |
| 266 | { |
| 267 | struct super_block *sb; |
| 268 | struct inode *inode, *dir; |
| 269 | struct buffer_head *bh = NULL; |
| 270 | int retval; |
| 271 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 272 | dir = d_inode(dentry->d_parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | sb = dir->i_sb; |
| 274 | |
| 275 | retval = -ENOENT; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 276 | inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (!inode) |
| 278 | goto done; |
| 279 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 280 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | retval = -EIO; |
| 282 | bh = affs_bread(sb, (u32)(long)dentry->d_fsdata); |
| 283 | if (!bh) |
| 284 | goto done; |
| 285 | |
| 286 | affs_lock_link(inode); |
| 287 | affs_lock_dir(dir); |
| 288 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { |
| 289 | case ST_USERDIR: |
| 290 | /* if we ever want to support links to dirs |
| 291 | * i_hash_lock of the inode must only be |
| 292 | * taken after some checks |
| 293 | */ |
| 294 | affs_lock_dir(inode); |
| 295 | retval = affs_empty_dir(inode); |
| 296 | affs_unlock_dir(inode); |
| 297 | if (retval) |
| 298 | goto done_unlock; |
| 299 | break; |
| 300 | default: |
| 301 | break; |
| 302 | } |
| 303 | |
| 304 | retval = affs_remove_hash(dir, bh); |
| 305 | if (retval) |
| 306 | goto done_unlock; |
| 307 | mark_buffer_dirty_inode(bh, inode); |
| 308 | |
| 309 | affs_unlock_dir(dir); |
| 310 | |
| 311 | if (inode->i_nlink > 1) |
| 312 | retval = affs_remove_link(dentry); |
| 313 | else |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 314 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | affs_unlock_link(inode); |
Deepa Dinamani | 02027d4 | 2016-09-14 07:48:05 -0700 | [diff] [blame] | 316 | inode->i_ctime = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | mark_inode_dirty(inode); |
| 318 | |
| 319 | done: |
| 320 | affs_brelse(bh); |
| 321 | return retval; |
| 322 | |
| 323 | done_unlock: |
| 324 | affs_unlock_dir(dir); |
| 325 | affs_unlock_link(inode); |
| 326 | goto done; |
| 327 | } |
| 328 | |
| 329 | /* Checksum a block, do various consistency checks and optionally return |
| 330 | the blocks type number. DATA points to the block. If their pointers |
| 331 | are non-null, *PTYPE and *STYPE are set to the primary and secondary |
| 332 | block types respectively, *HASHSIZE is set to the size of the hashtable |
| 333 | (which lets us calculate the block size). |
| 334 | Returns non-zero if the block is not consistent. */ |
| 335 | |
| 336 | u32 |
| 337 | affs_checksum_block(struct super_block *sb, struct buffer_head *bh) |
| 338 | { |
| 339 | __be32 *ptr = (__be32 *)bh->b_data; |
| 340 | u32 sum; |
| 341 | int bsize; |
| 342 | |
| 343 | sum = 0; |
| 344 | for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--) |
| 345 | sum += be32_to_cpu(*ptr++); |
| 346 | return sum; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Calculate the checksum of a disk block and store it |
| 351 | * at the indicated position. |
| 352 | */ |
| 353 | |
| 354 | void |
| 355 | affs_fix_checksum(struct super_block *sb, struct buffer_head *bh) |
| 356 | { |
| 357 | int cnt = sb->s_blocksize / sizeof(__be32); |
| 358 | __be32 *ptr = (__be32 *)bh->b_data; |
| 359 | u32 checksum; |
| 360 | __be32 *checksumptr; |
| 361 | |
| 362 | checksumptr = ptr + 5; |
| 363 | *checksumptr = 0; |
| 364 | for (checksum = 0; cnt > 0; ptr++, cnt--) |
| 365 | checksum += be32_to_cpu(*ptr); |
| 366 | *checksumptr = cpu_to_be32(-checksum); |
| 367 | } |
| 368 | |
| 369 | void |
Fabian Frederick | c161820 | 2017-02-27 14:27:54 -0800 | [diff] [blame] | 370 | affs_secs_to_datestamp(time64_t secs, struct affs_date *ds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | u32 days; |
| 373 | u32 minute; |
DengChao | db39c16 | 2015-11-12 21:40:41 +0800 | [diff] [blame] | 374 | s32 rem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60); |
| 377 | if (secs < 0) |
| 378 | secs = 0; |
DengChao | db39c16 | 2015-11-12 21:40:41 +0800 | [diff] [blame] | 379 | days = div_s64_rem(secs, 86400, &rem); |
| 380 | minute = rem / 60; |
| 381 | rem -= minute * 60; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | ds->days = cpu_to_be32(days); |
| 384 | ds->mins = cpu_to_be32(minute); |
DengChao | db39c16 | 2015-11-12 21:40:41 +0800 | [diff] [blame] | 385 | ds->ticks = cpu_to_be32(rem * 50); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | |
Al Viro | a760b03 | 2011-07-26 03:04:30 -0400 | [diff] [blame] | 388 | umode_t |
Fabian Frederick | c161820 | 2017-02-27 14:27:54 -0800 | [diff] [blame] | 389 | affs_prot_to_mode(u32 prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
Al Viro | a760b03 | 2011-07-26 03:04:30 -0400 | [diff] [blame] | 391 | umode_t mode = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | if (!(prot & FIBF_NOWRITE)) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 394 | mode |= 0200; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | if (!(prot & FIBF_NOREAD)) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 396 | mode |= 0400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | if (!(prot & FIBF_NOEXECUTE)) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 398 | mode |= 0100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | if (prot & FIBF_GRP_WRITE) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 400 | mode |= 0020; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | if (prot & FIBF_GRP_READ) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 402 | mode |= 0040; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if (prot & FIBF_GRP_EXECUTE) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 404 | mode |= 0010; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | if (prot & FIBF_OTR_WRITE) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 406 | mode |= 0002; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (prot & FIBF_OTR_READ) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 408 | mode |= 0004; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (prot & FIBF_OTR_EXECUTE) |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 410 | mode |= 0001; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | return mode; |
| 413 | } |
| 414 | |
| 415 | void |
Fabian Frederick | c161820 | 2017-02-27 14:27:54 -0800 | [diff] [blame] | 416 | affs_mode_to_prot(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | { |
| 418 | u32 prot = AFFS_I(inode)->i_protect; |
Al Viro | a760b03 | 2011-07-26 03:04:30 -0400 | [diff] [blame] | 419 | umode_t mode = inode->i_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 421 | if (!(mode & 0100)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | prot |= FIBF_NOEXECUTE; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 423 | if (!(mode & 0400)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | prot |= FIBF_NOREAD; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 425 | if (!(mode & 0200)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | prot |= FIBF_NOWRITE; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 427 | if (mode & 0010) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | prot |= FIBF_GRP_EXECUTE; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 429 | if (mode & 0040) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | prot |= FIBF_GRP_READ; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 431 | if (mode & 0020) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | prot |= FIBF_GRP_WRITE; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 433 | if (mode & 0001) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | prot |= FIBF_OTR_EXECUTE; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 435 | if (mode & 0004) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | prot |= FIBF_OTR_READ; |
Fabian Frederick | 1bafd6f | 2017-02-27 14:27:52 -0800 | [diff] [blame] | 437 | if (mode & 0002) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | prot |= FIBF_OTR_WRITE; |
| 439 | |
| 440 | AFFS_I(inode)->i_protect = prot; |
| 441 | } |
| 442 | |
| 443 | void |
| 444 | affs_error(struct super_block *sb, const char *function, const char *fmt, ...) |
| 445 | { |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 446 | struct va_format vaf; |
| 447 | va_list args; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 449 | va_start(args, fmt); |
| 450 | vaf.fmt = fmt; |
| 451 | vaf.va = &args; |
| 452 | pr_crit("error (device %s): %s(): %pV\n", sb->s_id, function, &vaf); |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 453 | if (!sb_rdonly(sb)) |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 454 | pr_warn("Remounting filesystem read-only\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | sb->s_flags |= MS_RDONLY; |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 456 | va_end(args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | void |
| 460 | affs_warning(struct super_block *sb, const char *function, const char *fmt, ...) |
| 461 | { |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 462 | struct va_format vaf; |
| 463 | va_list args; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 465 | va_start(args, fmt); |
| 466 | vaf.fmt = fmt; |
| 467 | vaf.va = &args; |
| 468 | pr_warn("(device %s): %s(): %pV\n", sb->s_id, function, &vaf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | va_end(args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 472 | bool |
| 473 | affs_nofilenametruncate(const struct dentry *dentry) |
| 474 | { |
Al Viro | e0b3f59 | 2016-07-29 18:22:49 -0400 | [diff] [blame] | 475 | return affs_test_opt(AFFS_SB(dentry->d_sb)->s_flags, SF_NO_TRUNCATE); |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | /* Check if the name is valid for a affs object. */ |
| 479 | |
| 480 | int |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 481 | affs_check_name(const unsigned char *name, int len, bool notruncate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
| 483 | int i; |
| 484 | |
Fabian Frederick | f157853 | 2015-02-17 13:46:23 -0800 | [diff] [blame] | 485 | if (len > AFFSNAMEMAX) { |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 486 | if (notruncate) |
| 487 | return -ENAMETOOLONG; |
Fabian Frederick | b4478e3 | 2015-02-17 13:46:25 -0800 | [diff] [blame] | 488 | len = AFFSNAMEMAX; |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 489 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | for (i = 0; i < len; i++) { |
| 491 | if (name[i] < ' ' || name[i] == ':' |
| 492 | || (name[i] > 0x7e && name[i] < 0xa0)) |
| 493 | return -EINVAL; |
| 494 | } |
| 495 | |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | /* This function copies name to bstr, with at most 30 |
| 500 | * characters length. The bstr will be prepended by |
| 501 | * a length byte. |
| 502 | * NOTE: The name will must be already checked by |
| 503 | * affs_check_name()! |
| 504 | */ |
| 505 | |
| 506 | int |
| 507 | affs_copy_name(unsigned char *bstr, struct dentry *dentry) |
| 508 | { |
Fabian Frederick | f157853 | 2015-02-17 13:46:23 -0800 | [diff] [blame] | 509 | u32 len = min(dentry->d_name.len, AFFSNAMEMAX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | *bstr++ = len; |
| 512 | memcpy(bstr, dentry->d_name.name, len); |
| 513 | return len; |
| 514 | } |