Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/affs/file.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 | * affs regular file handling primitives |
| 13 | */ |
| 14 | |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 15 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include "affs.h" |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | static int |
| 21 | affs_file_open(struct inode *inode, struct file *filp) |
| 22 | { |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 23 | pr_debug("open(%lu,%d)\n", |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 24 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); |
| 25 | atomic_inc(&AFFS_I(inode)->i_opencnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | return 0; |
| 27 | } |
| 28 | |
| 29 | static int |
| 30 | affs_file_release(struct inode *inode, struct file *filp) |
| 31 | { |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 32 | pr_debug("release(%lu, %d)\n", |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 33 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); |
| 34 | |
| 35 | if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) { |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 36 | inode_lock(inode); |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 37 | if (inode->i_size != AFFS_I(inode)->mmu_private) |
| 38 | affs_truncate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | affs_free_prealloc(inode); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 40 | inode_unlock(inode); |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 41 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static int |
| 47 | affs_grow_extcache(struct inode *inode, u32 lc_idx) |
| 48 | { |
| 49 | struct super_block *sb = inode->i_sb; |
| 50 | struct buffer_head *bh; |
| 51 | u32 lc_max; |
| 52 | int i, j, key; |
| 53 | |
| 54 | if (!AFFS_I(inode)->i_lc) { |
| 55 | char *ptr = (char *)get_zeroed_page(GFP_NOFS); |
| 56 | if (!ptr) |
| 57 | return -ENOMEM; |
| 58 | AFFS_I(inode)->i_lc = (u32 *)ptr; |
| 59 | AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2); |
| 60 | } |
| 61 | |
| 62 | lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift; |
| 63 | |
| 64 | if (AFFS_I(inode)->i_extcnt > lc_max) { |
| 65 | u32 lc_shift, lc_mask, tmp, off; |
| 66 | |
| 67 | /* need to recalculate linear cache, start from old size */ |
| 68 | lc_shift = AFFS_I(inode)->i_lc_shift; |
| 69 | tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift; |
| 70 | for (; tmp; tmp >>= 1) |
| 71 | lc_shift++; |
| 72 | lc_mask = (1 << lc_shift) - 1; |
| 73 | |
| 74 | /* fix idx and old size to new shift */ |
| 75 | lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift); |
| 76 | AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift); |
| 77 | |
| 78 | /* first shrink old cache to make more space */ |
| 79 | off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift); |
| 80 | for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off) |
| 81 | AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j]; |
| 82 | |
| 83 | AFFS_I(inode)->i_lc_shift = lc_shift; |
| 84 | AFFS_I(inode)->i_lc_mask = lc_mask; |
| 85 | } |
| 86 | |
| 87 | /* fill cache to the needed index */ |
| 88 | i = AFFS_I(inode)->i_lc_size; |
| 89 | AFFS_I(inode)->i_lc_size = lc_idx + 1; |
| 90 | for (; i <= lc_idx; i++) { |
| 91 | if (!i) { |
| 92 | AFFS_I(inode)->i_lc[0] = inode->i_ino; |
| 93 | continue; |
| 94 | } |
| 95 | key = AFFS_I(inode)->i_lc[i - 1]; |
| 96 | j = AFFS_I(inode)->i_lc_mask + 1; |
| 97 | // unlock cache |
| 98 | for (; j > 0; j--) { |
| 99 | bh = affs_bread(sb, key); |
| 100 | if (!bh) |
| 101 | goto err; |
| 102 | key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); |
| 103 | affs_brelse(bh); |
| 104 | } |
| 105 | // lock cache |
| 106 | AFFS_I(inode)->i_lc[i] = key; |
| 107 | } |
| 108 | |
| 109 | return 0; |
| 110 | |
| 111 | err: |
| 112 | // lock cache |
| 113 | return -EIO; |
| 114 | } |
| 115 | |
| 116 | static struct buffer_head * |
| 117 | affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext) |
| 118 | { |
| 119 | struct super_block *sb = inode->i_sb; |
| 120 | struct buffer_head *new_bh; |
| 121 | u32 blocknr, tmp; |
| 122 | |
| 123 | blocknr = affs_alloc_block(inode, bh->b_blocknr); |
| 124 | if (!blocknr) |
| 125 | return ERR_PTR(-ENOSPC); |
| 126 | |
| 127 | new_bh = affs_getzeroblk(sb, blocknr); |
| 128 | if (!new_bh) { |
| 129 | affs_free_block(sb, blocknr); |
| 130 | return ERR_PTR(-EIO); |
| 131 | } |
| 132 | |
| 133 | AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST); |
| 134 | AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr); |
| 135 | AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE); |
| 136 | AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino); |
| 137 | affs_fix_checksum(sb, new_bh); |
| 138 | |
| 139 | mark_buffer_dirty_inode(new_bh, inode); |
| 140 | |
| 141 | tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); |
| 142 | if (tmp) |
| 143 | affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp); |
| 144 | AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr); |
| 145 | affs_adjust_checksum(bh, blocknr - tmp); |
| 146 | mark_buffer_dirty_inode(bh, inode); |
| 147 | |
| 148 | AFFS_I(inode)->i_extcnt++; |
| 149 | mark_inode_dirty(inode); |
| 150 | |
| 151 | return new_bh; |
| 152 | } |
| 153 | |
| 154 | static inline struct buffer_head * |
| 155 | affs_get_extblock(struct inode *inode, u32 ext) |
| 156 | { |
| 157 | /* inline the simplest case: same extended block as last time */ |
| 158 | struct buffer_head *bh = AFFS_I(inode)->i_ext_bh; |
| 159 | if (ext == AFFS_I(inode)->i_ext_last) |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 160 | get_bh(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | else |
| 162 | /* we have to do more (not inlined) */ |
| 163 | bh = affs_get_extblock_slow(inode, ext); |
| 164 | |
| 165 | return bh; |
| 166 | } |
| 167 | |
| 168 | static struct buffer_head * |
| 169 | affs_get_extblock_slow(struct inode *inode, u32 ext) |
| 170 | { |
| 171 | struct super_block *sb = inode->i_sb; |
| 172 | struct buffer_head *bh; |
| 173 | u32 ext_key; |
| 174 | u32 lc_idx, lc_off, ac_idx; |
| 175 | u32 tmp, idx; |
| 176 | |
| 177 | if (ext == AFFS_I(inode)->i_ext_last + 1) { |
| 178 | /* read the next extended block from the current one */ |
| 179 | bh = AFFS_I(inode)->i_ext_bh; |
| 180 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); |
| 181 | if (ext < AFFS_I(inode)->i_extcnt) |
| 182 | goto read_ext; |
Fabian Frederick | afe305d | 2015-02-17 13:46:12 -0800 | [diff] [blame] | 183 | BUG_ON(ext > AFFS_I(inode)->i_extcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | bh = affs_alloc_extblock(inode, bh, ext); |
| 185 | if (IS_ERR(bh)) |
| 186 | return bh; |
| 187 | goto store_ext; |
| 188 | } |
| 189 | |
| 190 | if (ext == 0) { |
| 191 | /* we seek back to the file header block */ |
| 192 | ext_key = inode->i_ino; |
| 193 | goto read_ext; |
| 194 | } |
| 195 | |
| 196 | if (ext >= AFFS_I(inode)->i_extcnt) { |
| 197 | struct buffer_head *prev_bh; |
| 198 | |
| 199 | /* allocate a new extended block */ |
Fabian Frederick | afe305d | 2015-02-17 13:46:12 -0800 | [diff] [blame] | 200 | BUG_ON(ext > AFFS_I(inode)->i_extcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* get previous extended block */ |
| 203 | prev_bh = affs_get_extblock(inode, ext - 1); |
| 204 | if (IS_ERR(prev_bh)) |
| 205 | return prev_bh; |
| 206 | bh = affs_alloc_extblock(inode, prev_bh, ext); |
| 207 | affs_brelse(prev_bh); |
| 208 | if (IS_ERR(bh)) |
| 209 | return bh; |
| 210 | goto store_ext; |
| 211 | } |
| 212 | |
| 213 | again: |
| 214 | /* check if there is an extended cache and whether it's large enough */ |
| 215 | lc_idx = ext >> AFFS_I(inode)->i_lc_shift; |
| 216 | lc_off = ext & AFFS_I(inode)->i_lc_mask; |
| 217 | |
| 218 | if (lc_idx >= AFFS_I(inode)->i_lc_size) { |
| 219 | int err; |
| 220 | |
| 221 | err = affs_grow_extcache(inode, lc_idx); |
| 222 | if (err) |
| 223 | return ERR_PTR(err); |
| 224 | goto again; |
| 225 | } |
| 226 | |
| 227 | /* every n'th key we find in the linear cache */ |
| 228 | if (!lc_off) { |
| 229 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; |
| 230 | goto read_ext; |
| 231 | } |
| 232 | |
| 233 | /* maybe it's still in the associative cache */ |
| 234 | ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK; |
| 235 | if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) { |
| 236 | ext_key = AFFS_I(inode)->i_ac[ac_idx].key; |
| 237 | goto read_ext; |
| 238 | } |
| 239 | |
| 240 | /* try to find one of the previous extended blocks */ |
| 241 | tmp = ext; |
| 242 | idx = ac_idx; |
| 243 | while (--tmp, --lc_off > 0) { |
| 244 | idx = (idx - 1) & AFFS_AC_MASK; |
| 245 | if (AFFS_I(inode)->i_ac[idx].ext == tmp) { |
| 246 | ext_key = AFFS_I(inode)->i_ac[idx].key; |
| 247 | goto find_ext; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | /* fall back to the linear cache */ |
| 252 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; |
| 253 | find_ext: |
| 254 | /* read all extended blocks until we find the one we need */ |
| 255 | //unlock cache |
| 256 | do { |
| 257 | bh = affs_bread(sb, ext_key); |
| 258 | if (!bh) |
| 259 | goto err_bread; |
| 260 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); |
| 261 | affs_brelse(bh); |
| 262 | tmp++; |
| 263 | } while (tmp < ext); |
| 264 | //lock cache |
| 265 | |
| 266 | /* store it in the associative cache */ |
| 267 | // recalculate ac_idx? |
| 268 | AFFS_I(inode)->i_ac[ac_idx].ext = ext; |
| 269 | AFFS_I(inode)->i_ac[ac_idx].key = ext_key; |
| 270 | |
| 271 | read_ext: |
| 272 | /* finally read the right extended block */ |
| 273 | //unlock cache |
| 274 | bh = affs_bread(sb, ext_key); |
| 275 | if (!bh) |
| 276 | goto err_bread; |
| 277 | //lock cache |
| 278 | |
| 279 | store_ext: |
| 280 | /* release old cached extended block and store the new one */ |
| 281 | affs_brelse(AFFS_I(inode)->i_ext_bh); |
| 282 | AFFS_I(inode)->i_ext_last = ext; |
| 283 | AFFS_I(inode)->i_ext_bh = bh; |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 284 | get_bh(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | return bh; |
| 287 | |
| 288 | err_bread: |
| 289 | affs_brelse(bh); |
| 290 | return ERR_PTR(-EIO); |
| 291 | } |
| 292 | |
| 293 | static int |
| 294 | affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) |
| 295 | { |
| 296 | struct super_block *sb = inode->i_sb; |
| 297 | struct buffer_head *ext_bh; |
| 298 | u32 ext; |
| 299 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 300 | pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino, |
| 301 | (unsigned long long)block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Julia Lawall | 8d4b690 | 2008-04-29 00:59:12 -0700 | [diff] [blame] | 303 | BUG_ON(block > (sector_t)0x7fffffffUL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | if (block >= AFFS_I(inode)->i_blkcnt) { |
| 306 | if (block > AFFS_I(inode)->i_blkcnt || !create) |
| 307 | goto err_big; |
| 308 | } else |
| 309 | create = 0; |
| 310 | |
| 311 | //lock cache |
| 312 | affs_lock_ext(inode); |
| 313 | |
| 314 | ext = (u32)block / AFFS_SB(sb)->s_hashsize; |
| 315 | block -= ext * AFFS_SB(sb)->s_hashsize; |
| 316 | ext_bh = affs_get_extblock(inode, ext); |
| 317 | if (IS_ERR(ext_bh)) |
| 318 | goto err_ext; |
| 319 | map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); |
| 320 | |
| 321 | if (create) { |
| 322 | u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); |
| 323 | if (!blocknr) |
| 324 | goto err_alloc; |
| 325 | set_buffer_new(bh_result); |
| 326 | AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize; |
| 327 | AFFS_I(inode)->i_blkcnt++; |
| 328 | |
| 329 | /* store new block */ |
| 330 | if (bh_result->b_blocknr) |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 331 | affs_warning(sb, "get_block", |
| 332 | "block already set (%llx)", |
| 333 | (unsigned long long)bh_result->b_blocknr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); |
| 335 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1); |
| 336 | affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1); |
| 337 | bh_result->b_blocknr = blocknr; |
| 338 | |
| 339 | if (!block) { |
| 340 | /* insert first block into header block */ |
| 341 | u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data); |
| 342 | if (tmp) |
| 343 | affs_warning(sb, "get_block", "first block already set (%d)", tmp); |
| 344 | AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr); |
| 345 | affs_adjust_checksum(ext_bh, blocknr - tmp); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | affs_brelse(ext_bh); |
| 350 | //unlock cache |
| 351 | affs_unlock_ext(inode); |
| 352 | return 0; |
| 353 | |
| 354 | err_big: |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 355 | affs_error(inode->i_sb, "get_block", "strange block request %llu", |
| 356 | (unsigned long long)block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return -EIO; |
| 358 | err_ext: |
| 359 | // unlock cache |
| 360 | affs_unlock_ext(inode); |
| 361 | return PTR_ERR(ext_bh); |
| 362 | err_alloc: |
| 363 | brelse(ext_bh); |
| 364 | clear_buffer_mapped(bh_result); |
| 365 | bh_result->b_bdev = NULL; |
| 366 | // unlock cache |
| 367 | affs_unlock_ext(inode); |
| 368 | return -ENOSPC; |
| 369 | } |
| 370 | |
| 371 | static int affs_writepage(struct page *page, struct writeback_control *wbc) |
| 372 | { |
| 373 | return block_write_full_page(page, affs_get_block, wbc); |
| 374 | } |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | static int affs_readpage(struct file *file, struct page *page) |
| 377 | { |
| 378 | return block_read_full_page(page, affs_get_block); |
| 379 | } |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 380 | |
Marco Stornelli | 1dc1834 | 2012-12-15 11:51:53 +0100 | [diff] [blame] | 381 | static void affs_write_failed(struct address_space *mapping, loff_t to) |
| 382 | { |
| 383 | struct inode *inode = mapping->host; |
| 384 | |
| 385 | if (to > inode->i_size) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 386 | truncate_pagecache(inode, inode->i_size); |
Marco Stornelli | 1dc1834 | 2012-12-15 11:51:53 +0100 | [diff] [blame] | 387 | affs_truncate(inode); |
| 388 | } |
| 389 | } |
| 390 | |
Fabian Frederick | 9abb408 | 2014-12-12 16:57:52 -0800 | [diff] [blame] | 391 | static ssize_t |
Omar Sandoval | 22c6186 | 2015-03-16 04:33:53 -0700 | [diff] [blame] | 392 | affs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) |
Fabian Frederick | 9abb408 | 2014-12-12 16:57:52 -0800 | [diff] [blame] | 393 | { |
| 394 | struct file *file = iocb->ki_filp; |
| 395 | struct address_space *mapping = file->f_mapping; |
| 396 | struct inode *inode = mapping->host; |
| 397 | size_t count = iov_iter_count(iter); |
| 398 | ssize_t ret; |
| 399 | |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 400 | if (iov_iter_rw(iter) == WRITE) { |
Fabian Frederick | 92b2070 | 2015-02-17 13:46:15 -0800 | [diff] [blame] | 401 | loff_t size = offset + count; |
| 402 | |
| 403 | if (AFFS_I(inode)->mmu_private < size) |
| 404 | return 0; |
| 405 | } |
| 406 | |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 407 | ret = blockdev_direct_IO(iocb, inode, iter, offset, affs_get_block); |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 408 | if (ret < 0 && iov_iter_rw(iter) == WRITE) |
Fabian Frederick | 9abb408 | 2014-12-12 16:57:52 -0800 | [diff] [blame] | 409 | affs_write_failed(mapping, offset + count); |
| 410 | return ret; |
| 411 | } |
| 412 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 413 | static int affs_write_begin(struct file *file, struct address_space *mapping, |
| 414 | loff_t pos, unsigned len, unsigned flags, |
| 415 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 417 | int ret; |
| 418 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 419 | *pagep = NULL; |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 420 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 421 | affs_get_block, |
| 422 | &AFFS_I(mapping->host)->mmu_private); |
Marco Stornelli | 1dc1834 | 2012-12-15 11:51:53 +0100 | [diff] [blame] | 423 | if (unlikely(ret)) |
| 424 | affs_write_failed(mapping, pos + len); |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 425 | |
| 426 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | static sector_t _affs_bmap(struct address_space *mapping, sector_t block) |
| 430 | { |
| 431 | return generic_block_bmap(mapping,block,affs_get_block); |
| 432 | } |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 433 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 434 | const struct address_space_operations affs_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | .readpage = affs_readpage, |
| 436 | .writepage = affs_writepage, |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 437 | .write_begin = affs_write_begin, |
| 438 | .write_end = generic_write_end, |
Fabian Frederick | 9abb408 | 2014-12-12 16:57:52 -0800 | [diff] [blame] | 439 | .direct_IO = affs_direct_IO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | .bmap = _affs_bmap |
| 441 | }; |
| 442 | |
| 443 | static inline struct buffer_head * |
| 444 | affs_bread_ino(struct inode *inode, int block, int create) |
| 445 | { |
| 446 | struct buffer_head *bh, tmp_bh; |
| 447 | int err; |
| 448 | |
| 449 | tmp_bh.b_state = 0; |
| 450 | err = affs_get_block(inode, block, &tmp_bh, create); |
| 451 | if (!err) { |
| 452 | bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr); |
| 453 | if (bh) { |
| 454 | bh->b_state |= tmp_bh.b_state; |
| 455 | return bh; |
| 456 | } |
| 457 | err = -EIO; |
| 458 | } |
| 459 | return ERR_PTR(err); |
| 460 | } |
| 461 | |
| 462 | static inline struct buffer_head * |
| 463 | affs_getzeroblk_ino(struct inode *inode, int block) |
| 464 | { |
| 465 | struct buffer_head *bh, tmp_bh; |
| 466 | int err; |
| 467 | |
| 468 | tmp_bh.b_state = 0; |
| 469 | err = affs_get_block(inode, block, &tmp_bh, 1); |
| 470 | if (!err) { |
| 471 | bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr); |
| 472 | if (bh) { |
| 473 | bh->b_state |= tmp_bh.b_state; |
| 474 | return bh; |
| 475 | } |
| 476 | err = -EIO; |
| 477 | } |
| 478 | return ERR_PTR(err); |
| 479 | } |
| 480 | |
| 481 | static inline struct buffer_head * |
| 482 | affs_getemptyblk_ino(struct inode *inode, int block) |
| 483 | { |
| 484 | struct buffer_head *bh, tmp_bh; |
| 485 | int err; |
| 486 | |
| 487 | tmp_bh.b_state = 0; |
| 488 | err = affs_get_block(inode, block, &tmp_bh, 1); |
| 489 | if (!err) { |
| 490 | bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr); |
| 491 | if (bh) { |
| 492 | bh->b_state |= tmp_bh.b_state; |
| 493 | return bh; |
| 494 | } |
| 495 | err = -EIO; |
| 496 | } |
| 497 | return ERR_PTR(err); |
| 498 | } |
| 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | static int |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 501 | affs_do_readpage_ofs(struct page *page, unsigned to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | { |
| 503 | struct inode *inode = page->mapping->host; |
| 504 | struct super_block *sb = inode->i_sb; |
| 505 | struct buffer_head *bh; |
| 506 | char *data; |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 507 | unsigned pos = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | u32 bidx, boff, bsize; |
| 509 | u32 tmp; |
| 510 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 511 | pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino, |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 512 | page->index, to); |
| 513 | BUG_ON(to > PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | bsize = AFFS_SB(sb)->s_data_blksize; |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 515 | tmp = page->index << PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | bidx = tmp / bsize; |
| 517 | boff = tmp % bsize; |
| 518 | |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 519 | while (pos < to) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | bh = affs_bread_ino(inode, bidx, 0); |
| 521 | if (IS_ERR(bh)) |
| 522 | return PTR_ERR(bh); |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 523 | tmp = min(bsize - boff, to - pos); |
| 524 | BUG_ON(pos + tmp > to || tmp > bsize); |
Al Viro | 0bacbe5 | 2016-02-02 02:28:05 +0000 | [diff] [blame^] | 525 | data = kmap_atomic(page); |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 526 | memcpy(data + pos, AFFS_DATA(bh) + boff, tmp); |
Al Viro | 0bacbe5 | 2016-02-02 02:28:05 +0000 | [diff] [blame^] | 527 | kunmap_atomic(data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | affs_brelse(bh); |
| 529 | bidx++; |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 530 | pos += tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | boff = 0; |
| 532 | } |
| 533 | flush_dcache_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | return 0; |
| 535 | } |
| 536 | |
| 537 | static int |
| 538 | affs_extent_file_ofs(struct inode *inode, u32 newsize) |
| 539 | { |
| 540 | struct super_block *sb = inode->i_sb; |
| 541 | struct buffer_head *bh, *prev_bh; |
| 542 | u32 bidx, boff; |
| 543 | u32 size, bsize; |
| 544 | u32 tmp; |
| 545 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 546 | pr_debug("%s(%lu, %d)\n", __func__, inode->i_ino, newsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | bsize = AFFS_SB(sb)->s_data_blksize; |
| 548 | bh = NULL; |
| 549 | size = AFFS_I(inode)->mmu_private; |
| 550 | bidx = size / bsize; |
| 551 | boff = size % bsize; |
| 552 | if (boff) { |
| 553 | bh = affs_bread_ino(inode, bidx, 0); |
| 554 | if (IS_ERR(bh)) |
| 555 | return PTR_ERR(bh); |
| 556 | tmp = min(bsize - boff, newsize - size); |
Julia Lawall | 8d4b690 | 2008-04-29 00:59:12 -0700 | [diff] [blame] | 557 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | memset(AFFS_DATA(bh) + boff, 0, tmp); |
Marcin Slusarz | 6369a4a | 2008-04-30 00:54:47 -0700 | [diff] [blame] | 559 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | affs_fix_checksum(sb, bh); |
| 561 | mark_buffer_dirty_inode(bh, inode); |
| 562 | size += tmp; |
| 563 | bidx++; |
| 564 | } else if (bidx) { |
| 565 | bh = affs_bread_ino(inode, bidx - 1, 0); |
| 566 | if (IS_ERR(bh)) |
| 567 | return PTR_ERR(bh); |
| 568 | } |
| 569 | |
| 570 | while (size < newsize) { |
| 571 | prev_bh = bh; |
| 572 | bh = affs_getzeroblk_ino(inode, bidx); |
| 573 | if (IS_ERR(bh)) |
| 574 | goto out; |
| 575 | tmp = min(bsize, newsize - size); |
Julia Lawall | 8d4b690 | 2008-04-29 00:59:12 -0700 | [diff] [blame] | 576 | BUG_ON(tmp > bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); |
| 578 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); |
| 579 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); |
| 580 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); |
| 581 | affs_fix_checksum(sb, bh); |
| 582 | bh->b_state &= ~(1UL << BH_New); |
| 583 | mark_buffer_dirty_inode(bh, inode); |
| 584 | if (prev_bh) { |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 585 | u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
| 586 | |
| 587 | if (tmp_next) |
| 588 | affs_warning(sb, "extent_file_ofs", |
| 589 | "next block already set for %d (%d)", |
| 590 | bidx, tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 592 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | mark_buffer_dirty_inode(prev_bh, inode); |
| 594 | affs_brelse(prev_bh); |
| 595 | } |
| 596 | size += bsize; |
| 597 | bidx++; |
| 598 | } |
| 599 | affs_brelse(bh); |
| 600 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; |
| 601 | return 0; |
| 602 | |
| 603 | out: |
| 604 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; |
| 605 | return PTR_ERR(bh); |
| 606 | } |
| 607 | |
| 608 | static int |
| 609 | affs_readpage_ofs(struct file *file, struct page *page) |
| 610 | { |
| 611 | struct inode *inode = page->mapping->host; |
| 612 | u32 to; |
| 613 | int err; |
| 614 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 615 | pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | to = PAGE_CACHE_SIZE; |
| 617 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) { |
| 618 | to = inode->i_size & ~PAGE_CACHE_MASK; |
| 619 | memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to); |
| 620 | } |
| 621 | |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 622 | err = affs_do_readpage_ofs(page, to); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | if (!err) |
| 624 | SetPageUptodate(page); |
| 625 | unlock_page(page); |
| 626 | return err; |
| 627 | } |
| 628 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 629 | static int affs_write_begin_ofs(struct file *file, struct address_space *mapping, |
| 630 | loff_t pos, unsigned len, unsigned flags, |
| 631 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | { |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 633 | struct inode *inode = mapping->host; |
| 634 | struct page *page; |
| 635 | pgoff_t index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | int err = 0; |
| 637 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 638 | pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, |
| 639 | pos + len); |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 640 | if (pos > AFFS_I(inode)->mmu_private) { |
| 641 | /* XXX: this probably leaves a too-big i_size in case of |
| 642 | * failure. Should really be updating i_size at write_end time |
| 643 | */ |
| 644 | err = affs_extent_file_ofs(inode, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (err) |
| 646 | return err; |
| 647 | } |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 648 | |
| 649 | index = pos >> PAGE_CACHE_SHIFT; |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 650 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 651 | if (!page) |
| 652 | return -ENOMEM; |
| 653 | *pagep = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | if (PageUptodate(page)) |
| 656 | return 0; |
| 657 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 658 | /* XXX: inefficient but safe in the face of short writes */ |
Fabian Frederick | 0c89d67 | 2014-06-06 14:37:23 -0700 | [diff] [blame] | 659 | err = affs_do_readpage_ofs(page, PAGE_CACHE_SIZE); |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 660 | if (err) { |
| 661 | unlock_page(page); |
| 662 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | return err; |
| 665 | } |
| 666 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 667 | static int affs_write_end_ofs(struct file *file, struct address_space *mapping, |
| 668 | loff_t pos, unsigned len, unsigned copied, |
| 669 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | { |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 671 | struct inode *inode = mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | struct super_block *sb = inode->i_sb; |
| 673 | struct buffer_head *bh, *prev_bh; |
| 674 | char *data; |
| 675 | u32 bidx, boff, bsize; |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 676 | unsigned from, to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | u32 tmp; |
| 678 | int written; |
| 679 | |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 680 | from = pos & (PAGE_CACHE_SIZE - 1); |
| 681 | to = pos + len; |
| 682 | /* |
| 683 | * XXX: not sure if this can handle short copies (len < copied), but |
| 684 | * we don't have to, because the page should always be uptodate here, |
| 685 | * due to write_begin. |
| 686 | */ |
| 687 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 688 | pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, |
| 689 | pos + len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | bsize = AFFS_SB(sb)->s_data_blksize; |
| 691 | data = page_address(page); |
| 692 | |
| 693 | bh = NULL; |
| 694 | written = 0; |
| 695 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; |
| 696 | bidx = tmp / bsize; |
| 697 | boff = tmp % bsize; |
| 698 | if (boff) { |
| 699 | bh = affs_bread_ino(inode, bidx, 0); |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 700 | if (IS_ERR(bh)) { |
| 701 | written = PTR_ERR(bh); |
| 702 | goto err_first_bh; |
| 703 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | tmp = min(bsize - boff, to - from); |
Julia Lawall | 8d4b690 | 2008-04-29 00:59:12 -0700 | [diff] [blame] | 705 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | memcpy(AFFS_DATA(bh) + boff, data + from, tmp); |
Marcin Slusarz | 6369a4a | 2008-04-30 00:54:47 -0700 | [diff] [blame] | 707 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | affs_fix_checksum(sb, bh); |
| 709 | mark_buffer_dirty_inode(bh, inode); |
| 710 | written += tmp; |
| 711 | from += tmp; |
| 712 | bidx++; |
| 713 | } else if (bidx) { |
| 714 | bh = affs_bread_ino(inode, bidx - 1, 0); |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 715 | if (IS_ERR(bh)) { |
| 716 | written = PTR_ERR(bh); |
| 717 | goto err_first_bh; |
| 718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | } |
| 720 | while (from + bsize <= to) { |
| 721 | prev_bh = bh; |
| 722 | bh = affs_getemptyblk_ino(inode, bidx); |
| 723 | if (IS_ERR(bh)) |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 724 | goto err_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | memcpy(AFFS_DATA(bh), data + from, bsize); |
| 726 | if (buffer_new(bh)) { |
| 727 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); |
| 728 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); |
| 729 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); |
| 730 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize); |
| 731 | AFFS_DATA_HEAD(bh)->next = 0; |
| 732 | bh->b_state &= ~(1UL << BH_New); |
| 733 | if (prev_bh) { |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 734 | u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
| 735 | |
| 736 | if (tmp_next) |
| 737 | affs_warning(sb, "commit_write_ofs", |
| 738 | "next block already set for %d (%d)", |
| 739 | bidx, tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 741 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | mark_buffer_dirty_inode(prev_bh, inode); |
| 743 | } |
| 744 | } |
| 745 | affs_brelse(prev_bh); |
| 746 | affs_fix_checksum(sb, bh); |
| 747 | mark_buffer_dirty_inode(bh, inode); |
| 748 | written += bsize; |
| 749 | from += bsize; |
| 750 | bidx++; |
| 751 | } |
| 752 | if (from < to) { |
| 753 | prev_bh = bh; |
| 754 | bh = affs_bread_ino(inode, bidx, 1); |
| 755 | if (IS_ERR(bh)) |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 756 | goto err_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | tmp = min(bsize, to - from); |
Julia Lawall | 8d4b690 | 2008-04-29 00:59:12 -0700 | [diff] [blame] | 758 | BUG_ON(tmp > bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | memcpy(AFFS_DATA(bh), data + from, tmp); |
| 760 | if (buffer_new(bh)) { |
| 761 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); |
| 762 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); |
| 763 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); |
| 764 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); |
| 765 | AFFS_DATA_HEAD(bh)->next = 0; |
| 766 | bh->b_state &= ~(1UL << BH_New); |
| 767 | if (prev_bh) { |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 768 | u32 tmp_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
| 769 | |
| 770 | if (tmp_next) |
| 771 | affs_warning(sb, "commit_write_ofs", |
| 772 | "next block already set for %d (%d)", |
| 773 | bidx, tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 775 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | mark_buffer_dirty_inode(prev_bh, inode); |
| 777 | } |
| 778 | } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp) |
| 779 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); |
| 780 | affs_brelse(prev_bh); |
| 781 | affs_fix_checksum(sb, bh); |
| 782 | mark_buffer_dirty_inode(bh, inode); |
| 783 | written += tmp; |
| 784 | from += tmp; |
| 785 | bidx++; |
| 786 | } |
| 787 | SetPageUptodate(page); |
| 788 | |
| 789 | done: |
| 790 | affs_brelse(bh); |
| 791 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; |
| 792 | if (tmp > inode->i_size) |
| 793 | inode->i_size = AFFS_I(inode)->mmu_private = tmp; |
| 794 | |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 795 | err_first_bh: |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 796 | unlock_page(page); |
| 797 | page_cache_release(page); |
| 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | return written; |
| 800 | |
Taesoo Kim | 3d5d472 | 2015-03-25 15:55:29 -0700 | [diff] [blame] | 801 | err_bh: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | bh = prev_bh; |
| 803 | if (!written) |
| 804 | written = PTR_ERR(bh); |
| 805 | goto done; |
| 806 | } |
| 807 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 808 | const struct address_space_operations affs_aops_ofs = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | .readpage = affs_readpage_ofs, |
| 810 | //.writepage = affs_writepage_ofs, |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 811 | .write_begin = affs_write_begin_ofs, |
| 812 | .write_end = affs_write_end_ofs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | }; |
| 814 | |
| 815 | /* Free any preallocated blocks. */ |
| 816 | |
| 817 | void |
| 818 | affs_free_prealloc(struct inode *inode) |
| 819 | { |
| 820 | struct super_block *sb = inode->i_sb; |
| 821 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 822 | pr_debug("free_prealloc(ino=%lu)\n", inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | while (AFFS_I(inode)->i_pa_cnt) { |
| 825 | AFFS_I(inode)->i_pa_cnt--; |
| 826 | affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc); |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | /* Truncate (or enlarge) a file to the requested size. */ |
| 831 | |
| 832 | void |
| 833 | affs_truncate(struct inode *inode) |
| 834 | { |
| 835 | struct super_block *sb = inode->i_sb; |
| 836 | u32 ext, ext_key; |
| 837 | u32 last_blk, blkcnt, blk; |
| 838 | u32 size; |
| 839 | struct buffer_head *ext_bh; |
| 840 | int i; |
| 841 | |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 842 | pr_debug("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n", |
| 843 | inode->i_ino, AFFS_I(inode)->mmu_private, inode->i_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | last_blk = 0; |
| 846 | ext = 0; |
| 847 | if (inode->i_size) { |
| 848 | last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize; |
| 849 | ext = last_blk / AFFS_SB(sb)->s_hashsize; |
| 850 | } |
| 851 | |
| 852 | if (inode->i_size > AFFS_I(inode)->mmu_private) { |
| 853 | struct address_space *mapping = inode->i_mapping; |
| 854 | struct page *page; |
Nick Piggin | f2b6a16 | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 855 | void *fsdata; |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 856 | loff_t isize = inode->i_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | int res; |
| 858 | |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 859 | res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | if (!res) |
Fabian Frederick | 73516ac | 2014-10-13 15:53:54 -0700 | [diff] [blame] | 861 | res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata); |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 862 | else |
| 863 | inode->i_size = AFFS_I(inode)->mmu_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | mark_inode_dirty(inode); |
| 865 | return; |
| 866 | } else if (inode->i_size == AFFS_I(inode)->mmu_private) |
| 867 | return; |
| 868 | |
| 869 | // lock cache |
| 870 | ext_bh = affs_get_extblock(inode, ext); |
| 871 | if (IS_ERR(ext_bh)) { |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 872 | affs_warning(sb, "truncate", |
| 873 | "unexpected read error for ext block %u (%ld)", |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 874 | ext, PTR_ERR(ext_bh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return; |
| 876 | } |
| 877 | if (AFFS_I(inode)->i_lc) { |
| 878 | /* clear linear cache */ |
| 879 | i = (ext + 1) >> AFFS_I(inode)->i_lc_shift; |
| 880 | if (AFFS_I(inode)->i_lc_size > i) { |
| 881 | AFFS_I(inode)->i_lc_size = i; |
| 882 | for (; i < AFFS_LC_SIZE; i++) |
| 883 | AFFS_I(inode)->i_lc[i] = 0; |
| 884 | } |
| 885 | /* clear associative cache */ |
| 886 | for (i = 0; i < AFFS_AC_SIZE; i++) |
| 887 | if (AFFS_I(inode)->i_ac[i].ext >= ext) |
| 888 | AFFS_I(inode)->i_ac[i].ext = 0; |
| 889 | } |
| 890 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); |
| 891 | |
| 892 | blkcnt = AFFS_I(inode)->i_blkcnt; |
| 893 | i = 0; |
| 894 | blk = last_blk; |
| 895 | if (inode->i_size) { |
| 896 | i = last_blk % AFFS_SB(sb)->s_hashsize + 1; |
| 897 | blk++; |
| 898 | } else |
| 899 | AFFS_HEAD(ext_bh)->first_data = 0; |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 900 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | size = AFFS_SB(sb)->s_hashsize; |
| 902 | if (size > blkcnt - blk + i) |
| 903 | size = blkcnt - blk + i; |
| 904 | for (; i < size; i++, blk++) { |
| 905 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); |
| 906 | AFFS_BLOCK(sb, ext_bh, i) = 0; |
| 907 | } |
| 908 | AFFS_TAIL(sb, ext_bh)->extension = 0; |
| 909 | affs_fix_checksum(sb, ext_bh); |
| 910 | mark_buffer_dirty_inode(ext_bh, inode); |
| 911 | affs_brelse(ext_bh); |
| 912 | |
| 913 | if (inode->i_size) { |
| 914 | AFFS_I(inode)->i_blkcnt = last_blk + 1; |
| 915 | AFFS_I(inode)->i_extcnt = ext + 1; |
Fabian Frederick | 79bda4d | 2015-04-16 12:48:24 -0700 | [diff] [blame] | 916 | if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); |
| 918 | u32 tmp; |
Dan Carpenter | 0e45b67 | 2010-08-25 09:05:27 +0200 | [diff] [blame] | 919 | if (IS_ERR(bh)) { |
Fabian Frederick | 1ee54b0 | 2014-12-12 16:57:49 -0800 | [diff] [blame] | 920 | affs_warning(sb, "truncate", |
| 921 | "unexpected read error for last block %u (%ld)", |
Geert Uytterhoeven | 08fe100 | 2015-02-17 13:46:10 -0800 | [diff] [blame] | 922 | ext, PTR_ERR(bh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | return; |
| 924 | } |
| 925 | tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next); |
| 926 | AFFS_DATA_HEAD(bh)->next = 0; |
| 927 | affs_adjust_checksum(bh, -tmp); |
| 928 | affs_brelse(bh); |
| 929 | } |
| 930 | } else { |
| 931 | AFFS_I(inode)->i_blkcnt = 0; |
| 932 | AFFS_I(inode)->i_extcnt = 1; |
| 933 | } |
| 934 | AFFS_I(inode)->mmu_private = inode->i_size; |
| 935 | // unlock cache |
| 936 | |
| 937 | while (ext_key) { |
| 938 | ext_bh = affs_bread(sb, ext_key); |
| 939 | size = AFFS_SB(sb)->s_hashsize; |
| 940 | if (size > blkcnt - blk) |
| 941 | size = blkcnt - blk; |
| 942 | for (i = 0; i < size; i++, blk++) |
| 943 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); |
| 944 | affs_free_block(sb, ext_key); |
| 945 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); |
| 946 | affs_brelse(ext_bh); |
| 947 | } |
| 948 | affs_free_prealloc(inode); |
| 949 | } |
Al Viro | c475879 | 2009-06-08 01:22:00 -0400 | [diff] [blame] | 950 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 951 | int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
Al Viro | c475879 | 2009-06-08 01:22:00 -0400 | [diff] [blame] | 952 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 953 | struct inode *inode = filp->f_mapping->host; |
Al Viro | c475879 | 2009-06-08 01:22:00 -0400 | [diff] [blame] | 954 | int ret, err; |
| 955 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 956 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 957 | if (err) |
| 958 | return err; |
| 959 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 960 | inode_lock(inode); |
Al Viro | c475879 | 2009-06-08 01:22:00 -0400 | [diff] [blame] | 961 | ret = write_inode_now(inode, 0); |
| 962 | err = sync_blockdev(inode->i_sb->s_bdev); |
| 963 | if (!ret) |
| 964 | ret = err; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 965 | inode_unlock(inode); |
Al Viro | c475879 | 2009-06-08 01:22:00 -0400 | [diff] [blame] | 966 | return ret; |
| 967 | } |
Fabian Frederick | 7633978 | 2014-12-12 16:57:47 -0800 | [diff] [blame] | 968 | const struct file_operations affs_file_operations = { |
| 969 | .llseek = generic_file_llseek, |
Fabian Frederick | 7633978 | 2014-12-12 16:57:47 -0800 | [diff] [blame] | 970 | .read_iter = generic_file_read_iter, |
Fabian Frederick | 7633978 | 2014-12-12 16:57:47 -0800 | [diff] [blame] | 971 | .write_iter = generic_file_write_iter, |
| 972 | .mmap = generic_file_mmap, |
| 973 | .open = affs_file_open, |
| 974 | .release = affs_file_release, |
| 975 | .fsync = affs_file_fsync, |
| 976 | .splice_read = generic_file_splice_read, |
| 977 | }; |
| 978 | |
| 979 | const struct inode_operations affs_file_inode_operations = { |
| 980 | .setattr = affs_notify_change, |
| 981 | }; |