Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ufs/balloc.c | |
3 | * | |
4 | * Copyright (C) 1998 | |
5 | * Daniel Pirkl <daniel.pirkl@email.cz> | |
6 | * Charles University, Faculty of Mathematics and Physics | |
54fb996a ED |
7 | * |
8 | * UFS2 write support Evgeniy Dushistov <dushistov@mail.ru>, 2007 | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/fs.h> | |
1da177e4 LT |
12 | #include <linux/stat.h> |
13 | #include <linux/time.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/quotaops.h> | |
16 | #include <linux/buffer_head.h> | |
16f7e0fe | 17 | #include <linux/capability.h> |
1da177e4 LT |
18 | #include <linux/bitops.h> |
19 | #include <asm/byteorder.h> | |
20 | ||
e5420598 | 21 | #include "ufs_fs.h" |
bcd6d4ec | 22 | #include "ufs.h" |
1da177e4 LT |
23 | #include "swab.h" |
24 | #include "util.h" | |
25 | ||
54fb996a ED |
26 | #define INVBLOCK ((u64)-1L) |
27 | ||
28 | static u64 ufs_add_fragments(struct inode *, u64, unsigned, unsigned, int *); | |
29 | static u64 ufs_alloc_fragments(struct inode *, unsigned, u64, unsigned, int *); | |
30 | static u64 ufs_alloccg_block(struct inode *, struct ufs_cg_private_info *, u64, int *); | |
31 | static u64 ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, u64, unsigned); | |
1da177e4 LT |
32 | static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[]; |
33 | static void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int); | |
34 | ||
35 | /* | |
36 | * Free 'count' fragments from fragment number 'fragment' | |
37 | */ | |
54fb996a | 38 | void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count) |
6ef4d6bf | 39 | { |
1da177e4 LT |
40 | struct super_block * sb; |
41 | struct ufs_sb_private_info * uspi; | |
42 | struct ufs_super_block_first * usb1; | |
43 | struct ufs_cg_private_info * ucpi; | |
44 | struct ufs_cylinder_group * ucg; | |
54fb996a ED |
45 | unsigned cgno, bit, end_bit, bbase, blkmap, i; |
46 | u64 blkno; | |
1da177e4 LT |
47 | |
48 | sb = inode->i_sb; | |
49 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 50 | usb1 = ubh_get_usb_first(uspi); |
1da177e4 | 51 | |
54fb996a ED |
52 | UFSD("ENTER, fragment %llu, count %u\n", |
53 | (unsigned long long)fragment, count); | |
1da177e4 LT |
54 | |
55 | if (ufs_fragnum(fragment) + count > uspi->s_fpg) | |
56 | ufs_error (sb, "ufs_free_fragments", "internal error"); | |
57 | ||
58 | lock_super(sb); | |
59 | ||
54fb996a ED |
60 | cgno = ufs_dtog(uspi, fragment); |
61 | bit = ufs_dtogd(uspi, fragment); | |
1da177e4 LT |
62 | if (cgno >= uspi->s_ncg) { |
63 | ufs_panic (sb, "ufs_free_fragments", "freeing blocks are outside device"); | |
64 | goto failed; | |
65 | } | |
66 | ||
67 | ucpi = ufs_load_cylinder (sb, cgno); | |
68 | if (!ucpi) | |
69 | goto failed; | |
9695ef16 | 70 | ucg = ubh_get_ucg (UCPI_UBH(ucpi)); |
1da177e4 LT |
71 | if (!ufs_cg_chkmagic(sb, ucg)) { |
72 | ufs_panic (sb, "ufs_free_fragments", "internal error, bad magic number on cg %u", cgno); | |
73 | goto failed; | |
74 | } | |
75 | ||
76 | end_bit = bit + count; | |
77 | bbase = ufs_blknum (bit); | |
9695ef16 | 78 | blkmap = ubh_blkmap (UCPI_UBH(ucpi), ucpi->c_freeoff, bbase); |
1da177e4 LT |
79 | ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1); |
80 | for (i = bit; i < end_bit; i++) { | |
9695ef16 ED |
81 | if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, i)) |
82 | ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, i); | |
7b4ee73e E |
83 | else |
84 | ufs_error (sb, "ufs_free_fragments", | |
85 | "bit already cleared for fragment %u", i); | |
1da177e4 LT |
86 | } |
87 | ||
5dd4056d | 88 | dquot_free_block(inode, count); |
1da177e4 LT |
89 | |
90 | ||
91 | fs32_add(sb, &ucg->cg_cs.cs_nffree, count); | |
ee3ffd6c | 92 | uspi->cs_total.cs_nffree += count; |
1da177e4 | 93 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); |
9695ef16 | 94 | blkmap = ubh_blkmap (UCPI_UBH(ucpi), ucpi->c_freeoff, bbase); |
1da177e4 LT |
95 | ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1); |
96 | ||
97 | /* | |
98 | * Trying to reassemble free fragments into block | |
99 | */ | |
100 | blkno = ufs_fragstoblks (bbase); | |
9695ef16 | 101 | if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno)) { |
1da177e4 | 102 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb); |
ee3ffd6c | 103 | uspi->cs_total.cs_nffree -= uspi->s_fpb; |
1da177e4 LT |
104 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb); |
105 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) | |
106 | ufs_clusteracct (sb, ucpi, blkno, 1); | |
107 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); | |
ee3ffd6c | 108 | uspi->cs_total.cs_nbfree++; |
1da177e4 | 109 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); |
54fb996a ED |
110 | if (uspi->fs_magic != UFS2_MAGIC) { |
111 | unsigned cylno = ufs_cbtocylno (bbase); | |
112 | ||
113 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, | |
114 | ufs_cbtorpos(bbase)), 1); | |
115 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
116 | } | |
1da177e4 LT |
117 | } |
118 | ||
9695ef16 ED |
119 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
120 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); | |
1da177e4 | 121 | if (sb->s_flags & MS_SYNCHRONOUS) { |
098d5af7 | 122 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
9695ef16 | 123 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
1da177e4 LT |
124 | } |
125 | sb->s_dirt = 1; | |
126 | ||
127 | unlock_super (sb); | |
abf5d15f | 128 | UFSD("EXIT\n"); |
1da177e4 LT |
129 | return; |
130 | ||
131 | failed: | |
132 | unlock_super (sb); | |
abf5d15f | 133 | UFSD("EXIT (FAILED)\n"); |
1da177e4 LT |
134 | return; |
135 | } | |
136 | ||
137 | /* | |
138 | * Free 'count' fragments from fragment number 'fragment' (free whole blocks) | |
139 | */ | |
54fb996a | 140 | void ufs_free_blocks(struct inode *inode, u64 fragment, unsigned count) |
6ef4d6bf | 141 | { |
1da177e4 LT |
142 | struct super_block * sb; |
143 | struct ufs_sb_private_info * uspi; | |
144 | struct ufs_super_block_first * usb1; | |
145 | struct ufs_cg_private_info * ucpi; | |
146 | struct ufs_cylinder_group * ucg; | |
54fb996a ED |
147 | unsigned overflow, cgno, bit, end_bit, i; |
148 | u64 blkno; | |
1da177e4 LT |
149 | |
150 | sb = inode->i_sb; | |
151 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 152 | usb1 = ubh_get_usb_first(uspi); |
1da177e4 | 153 | |
54fb996a ED |
154 | UFSD("ENTER, fragment %llu, count %u\n", |
155 | (unsigned long long)fragment, count); | |
1da177e4 LT |
156 | |
157 | if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) { | |
158 | ufs_error (sb, "ufs_free_blocks", "internal error, " | |
54fb996a ED |
159 | "fragment %llu, count %u\n", |
160 | (unsigned long long)fragment, count); | |
1da177e4 LT |
161 | goto failed; |
162 | } | |
163 | ||
164 | lock_super(sb); | |
165 | ||
166 | do_more: | |
167 | overflow = 0; | |
54fb996a ED |
168 | cgno = ufs_dtog(uspi, fragment); |
169 | bit = ufs_dtogd(uspi, fragment); | |
1da177e4 LT |
170 | if (cgno >= uspi->s_ncg) { |
171 | ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device"); | |
2e006393 | 172 | goto failed_unlock; |
1da177e4 LT |
173 | } |
174 | end_bit = bit + count; | |
175 | if (end_bit > uspi->s_fpg) { | |
176 | overflow = bit + count - uspi->s_fpg; | |
177 | count -= overflow; | |
178 | end_bit -= overflow; | |
179 | } | |
180 | ||
181 | ucpi = ufs_load_cylinder (sb, cgno); | |
182 | if (!ucpi) | |
2e006393 | 183 | goto failed_unlock; |
9695ef16 | 184 | ucg = ubh_get_ucg (UCPI_UBH(ucpi)); |
1da177e4 LT |
185 | if (!ufs_cg_chkmagic(sb, ucg)) { |
186 | ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno); | |
2e006393 | 187 | goto failed_unlock; |
1da177e4 LT |
188 | } |
189 | ||
190 | for (i = bit; i < end_bit; i += uspi->s_fpb) { | |
191 | blkno = ufs_fragstoblks(i); | |
9695ef16 | 192 | if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno)) { |
1da177e4 LT |
193 | ufs_error(sb, "ufs_free_blocks", "freeing free fragment"); |
194 | } | |
9695ef16 | 195 | ubh_setblock(UCPI_UBH(ucpi), ucpi->c_freeoff, blkno); |
1da177e4 LT |
196 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) |
197 | ufs_clusteracct (sb, ucpi, blkno, 1); | |
5dd4056d | 198 | dquot_free_block(inode, uspi->s_fpb); |
1da177e4 LT |
199 | |
200 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); | |
ee3ffd6c | 201 | uspi->cs_total.cs_nbfree++; |
1da177e4 | 202 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); |
54fb996a ED |
203 | |
204 | if (uspi->fs_magic != UFS2_MAGIC) { | |
205 | unsigned cylno = ufs_cbtocylno(i); | |
206 | ||
207 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, | |
208 | ufs_cbtorpos(i)), 1); | |
209 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
210 | } | |
1da177e4 LT |
211 | } |
212 | ||
9695ef16 ED |
213 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
214 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); | |
1da177e4 | 215 | if (sb->s_flags & MS_SYNCHRONOUS) { |
098d5af7 | 216 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
9695ef16 | 217 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
1da177e4 LT |
218 | } |
219 | ||
220 | if (overflow) { | |
221 | fragment += count; | |
222 | count = overflow; | |
223 | goto do_more; | |
224 | } | |
225 | ||
226 | sb->s_dirt = 1; | |
227 | unlock_super (sb); | |
abf5d15f | 228 | UFSD("EXIT\n"); |
1da177e4 LT |
229 | return; |
230 | ||
2e006393 | 231 | failed_unlock: |
1da177e4 | 232 | unlock_super (sb); |
2e006393 | 233 | failed: |
abf5d15f | 234 | UFSD("EXIT (FAILED)\n"); |
1da177e4 LT |
235 | return; |
236 | } | |
237 | ||
6ef4d6bf ED |
238 | /* |
239 | * Modify inode page cache in such way: | |
240 | * have - blocks with b_blocknr equal to oldb...oldb+count-1 | |
241 | * get - blocks with b_blocknr equal to newb...newb+count-1 | |
242 | * also we suppose that oldb...oldb+count-1 blocks | |
243 | * situated at the end of file. | |
244 | * | |
245 | * We can come here from ufs_writepage or ufs_prepare_write, | |
246 | * locked_page is argument of these functions, so we already lock it. | |
247 | */ | |
5431bf97 ED |
248 | static void ufs_change_blocknr(struct inode *inode, sector_t beg, |
249 | unsigned int count, sector_t oldb, | |
250 | sector_t newb, struct page *locked_page) | |
6ef4d6bf | 251 | { |
5431bf97 ED |
252 | const unsigned blks_per_page = |
253 | 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
254 | const unsigned mask = blks_per_page - 1; | |
efee2b81 | 255 | struct address_space * const mapping = inode->i_mapping; |
5431bf97 ED |
256 | pgoff_t index, cur_index, last_index; |
257 | unsigned pos, j, lblock; | |
258 | sector_t end, i; | |
6ef4d6bf ED |
259 | struct page *page; |
260 | struct buffer_head *head, *bh; | |
261 | ||
5431bf97 ED |
262 | UFSD("ENTER, ino %lu, count %u, oldb %llu, newb %llu\n", |
263 | inode->i_ino, count, | |
264 | (unsigned long long)oldb, (unsigned long long)newb); | |
6ef4d6bf | 265 | |
a685e26f | 266 | BUG_ON(!locked_page); |
6ef4d6bf ED |
267 | BUG_ON(!PageLocked(locked_page)); |
268 | ||
a685e26f | 269 | cur_index = locked_page->index; |
5431bf97 ED |
270 | end = count + beg; |
271 | last_index = end >> (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
272 | for (i = beg; i < end; i = (i | mask) + 1) { | |
273 | index = i >> (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
6ef4d6bf ED |
274 | |
275 | if (likely(cur_index != index)) { | |
276 | page = ufs_get_locked_page(mapping, index); | |
5431bf97 ED |
277 | if (!page)/* it was truncated */ |
278 | continue; | |
279 | if (IS_ERR(page)) {/* or EIO */ | |
9746077a | 280 | ufs_error(inode->i_sb, __func__, |
5431bf97 ED |
281 | "read of page %llu failed\n", |
282 | (unsigned long long)index); | |
6ef4d6bf | 283 | continue; |
5431bf97 | 284 | } |
6ef4d6bf ED |
285 | } else |
286 | page = locked_page; | |
287 | ||
6ef4d6bf ED |
288 | head = page_buffers(page); |
289 | bh = head; | |
5431bf97 | 290 | pos = i & mask; |
efee2b81 ED |
291 | for (j = 0; j < pos; ++j) |
292 | bh = bh->b_this_page; | |
5431bf97 ED |
293 | |
294 | ||
295 | if (unlikely(index == last_index)) | |
296 | lblock = end & mask; | |
297 | else | |
298 | lblock = blks_per_page; | |
299 | ||
6ef4d6bf | 300 | do { |
5431bf97 ED |
301 | if (j >= lblock) |
302 | break; | |
303 | pos = (i - beg) + j; | |
304 | ||
305 | if (!buffer_mapped(bh)) | |
306 | map_bh(bh, inode->i_sb, oldb + pos); | |
307 | if (!buffer_uptodate(bh)) { | |
308 | ll_rw_block(READ, 1, &bh); | |
309 | wait_on_buffer(bh); | |
310 | if (!buffer_uptodate(bh)) { | |
9746077a | 311 | ufs_error(inode->i_sb, __func__, |
5431bf97 ED |
312 | "read of block failed\n"); |
313 | break; | |
efee2b81 | 314 | } |
6ef4d6bf ED |
315 | } |
316 | ||
5431bf97 | 317 | UFSD(" change from %llu to %llu, pos %u\n", |
9df13039 AM |
318 | (unsigned long long)(pos + oldb), |
319 | (unsigned long long)(pos + newb), pos); | |
5431bf97 ED |
320 | |
321 | bh->b_blocknr = newb + pos; | |
322 | unmap_underlying_metadata(bh->b_bdev, | |
323 | bh->b_blocknr); | |
324 | mark_buffer_dirty(bh); | |
325 | ++j; | |
6ef4d6bf ED |
326 | bh = bh->b_this_page; |
327 | } while (bh != head); | |
328 | ||
10e5dce0 ED |
329 | if (likely(cur_index != index)) |
330 | ufs_put_locked_page(page); | |
6ef4d6bf | 331 | } |
abf5d15f | 332 | UFSD("EXIT\n"); |
6ef4d6bf ED |
333 | } |
334 | ||
d63b7090 ED |
335 | static void ufs_clear_frags(struct inode *inode, sector_t beg, unsigned int n, |
336 | int sync) | |
337 | { | |
338 | struct buffer_head *bh; | |
339 | sector_t end = beg + n; | |
340 | ||
341 | for (; beg < end; ++beg) { | |
342 | bh = sb_getblk(inode->i_sb, beg); | |
343 | lock_buffer(bh); | |
344 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
345 | set_buffer_uptodate(bh); | |
346 | mark_buffer_dirty(bh); | |
347 | unlock_buffer(bh); | |
348 | if (IS_SYNC(inode) || sync) | |
349 | sync_dirty_buffer(bh); | |
350 | brelse(bh); | |
351 | } | |
352 | } | |
353 | ||
54fb996a ED |
354 | u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment, |
355 | u64 goal, unsigned count, int *err, | |
356 | struct page *locked_page) | |
1da177e4 LT |
357 | { |
358 | struct super_block * sb; | |
359 | struct ufs_sb_private_info * uspi; | |
360 | struct ufs_super_block_first * usb1; | |
54fb996a ED |
361 | unsigned cgno, oldcount, newcount; |
362 | u64 tmp, request, result; | |
1da177e4 | 363 | |
54fb996a ED |
364 | UFSD("ENTER, ino %lu, fragment %llu, goal %llu, count %u\n", |
365 | inode->i_ino, (unsigned long long)fragment, | |
366 | (unsigned long long)goal, count); | |
1da177e4 LT |
367 | |
368 | sb = inode->i_sb; | |
369 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 370 | usb1 = ubh_get_usb_first(uspi); |
1da177e4 LT |
371 | *err = -ENOSPC; |
372 | ||
373 | lock_super (sb); | |
54fb996a ED |
374 | tmp = ufs_data_ptr_to_cpu(sb, p); |
375 | ||
1da177e4 | 376 | if (count + ufs_fragnum(fragment) > uspi->s_fpb) { |
54fb996a ED |
377 | ufs_warning(sb, "ufs_new_fragments", "internal warning" |
378 | " fragment %llu, count %u", | |
379 | (unsigned long long)fragment, count); | |
1da177e4 LT |
380 | count = uspi->s_fpb - ufs_fragnum(fragment); |
381 | } | |
382 | oldcount = ufs_fragnum (fragment); | |
383 | newcount = oldcount + count; | |
384 | ||
385 | /* | |
386 | * Somebody else has just allocated our fragments | |
387 | */ | |
388 | if (oldcount) { | |
389 | if (!tmp) { | |
54fb996a ED |
390 | ufs_error(sb, "ufs_new_fragments", "internal error, " |
391 | "fragment %llu, tmp %llu\n", | |
392 | (unsigned long long)fragment, | |
393 | (unsigned long long)tmp); | |
394 | unlock_super(sb); | |
395 | return INVBLOCK; | |
1da177e4 LT |
396 | } |
397 | if (fragment < UFS_I(inode)->i_lastfrag) { | |
abf5d15f | 398 | UFSD("EXIT (ALREADY ALLOCATED)\n"); |
1da177e4 LT |
399 | unlock_super (sb); |
400 | return 0; | |
401 | } | |
402 | } | |
403 | else { | |
404 | if (tmp) { | |
abf5d15f | 405 | UFSD("EXIT (ALREADY ALLOCATED)\n"); |
1da177e4 LT |
406 | unlock_super(sb); |
407 | return 0; | |
408 | } | |
409 | } | |
410 | ||
411 | /* | |
412 | * There is not enough space for user on the device | |
413 | */ | |
ee3ffd6c | 414 | if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(uspi, UFS_MINFREE) <= 0) { |
1da177e4 | 415 | unlock_super (sb); |
abf5d15f | 416 | UFSD("EXIT (FAILED)\n"); |
1da177e4 LT |
417 | return 0; |
418 | } | |
419 | ||
420 | if (goal >= uspi->s_size) | |
421 | goal = 0; | |
422 | if (goal == 0) | |
423 | cgno = ufs_inotocg (inode->i_ino); | |
424 | else | |
54fb996a | 425 | cgno = ufs_dtog(uspi, goal); |
1da177e4 LT |
426 | |
427 | /* | |
428 | * allocate new fragment | |
429 | */ | |
430 | if (oldcount == 0) { | |
431 | result = ufs_alloc_fragments (inode, cgno, goal, count, err); | |
432 | if (result) { | |
54fb996a | 433 | ufs_cpu_to_data_ptr(sb, p, result); |
1da177e4 | 434 | *err = 0; |
54fb996a ED |
435 | UFS_I(inode)->i_lastfrag = |
436 | max_t(u32, UFS_I(inode)->i_lastfrag, | |
437 | fragment + count); | |
438 | ufs_clear_frags(inode, result + oldcount, | |
439 | newcount - oldcount, locked_page != NULL); | |
1da177e4 LT |
440 | } |
441 | unlock_super(sb); | |
54fb996a | 442 | UFSD("EXIT, result %llu\n", (unsigned long long)result); |
1da177e4 LT |
443 | return result; |
444 | } | |
445 | ||
446 | /* | |
447 | * resize block | |
448 | */ | |
449 | result = ufs_add_fragments (inode, tmp, oldcount, newcount, err); | |
450 | if (result) { | |
451 | *err = 0; | |
1da177e4 | 452 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); |
d63b7090 ED |
453 | ufs_clear_frags(inode, result + oldcount, newcount - oldcount, |
454 | locked_page != NULL); | |
1da177e4 | 455 | unlock_super(sb); |
54fb996a | 456 | UFSD("EXIT, result %llu\n", (unsigned long long)result); |
1da177e4 LT |
457 | return result; |
458 | } | |
459 | ||
460 | /* | |
461 | * allocate new block and move data | |
462 | */ | |
463 | switch (fs32_to_cpu(sb, usb1->fs_optim)) { | |
464 | case UFS_OPTSPACE: | |
465 | request = newcount; | |
ee3ffd6c ED |
466 | if (uspi->s_minfree < 5 || uspi->cs_total.cs_nffree |
467 | > uspi->s_dsize * uspi->s_minfree / (2 * 100)) | |
1da177e4 LT |
468 | break; |
469 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
470 | break; | |
471 | default: | |
472 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
473 | ||
474 | case UFS_OPTTIME: | |
475 | request = uspi->s_fpb; | |
ee3ffd6c | 476 | if (uspi->cs_total.cs_nffree < uspi->s_dsize * |
1da177e4 LT |
477 | (uspi->s_minfree - 2) / 100) |
478 | break; | |
479 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
480 | break; | |
481 | } | |
482 | result = ufs_alloc_fragments (inode, cgno, goal, request, err); | |
483 | if (result) { | |
efee2b81 ED |
484 | ufs_clear_frags(inode, result + oldcount, newcount - oldcount, |
485 | locked_page != NULL); | |
4b25a37e ED |
486 | ufs_change_blocknr(inode, fragment - oldcount, oldcount, |
487 | uspi->s_sbbase + tmp, | |
488 | uspi->s_sbbase + result, locked_page); | |
54fb996a | 489 | ufs_cpu_to_data_ptr(sb, p, result); |
1da177e4 | 490 | *err = 0; |
1da177e4 | 491 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); |
1da177e4 LT |
492 | unlock_super(sb); |
493 | if (newcount < request) | |
494 | ufs_free_fragments (inode, result + newcount, request - newcount); | |
495 | ufs_free_fragments (inode, tmp, oldcount); | |
54fb996a | 496 | UFSD("EXIT, result %llu\n", (unsigned long long)result); |
1da177e4 LT |
497 | return result; |
498 | } | |
499 | ||
500 | unlock_super(sb); | |
abf5d15f | 501 | UFSD("EXIT (FAILED)\n"); |
1da177e4 LT |
502 | return 0; |
503 | } | |
504 | ||
54fb996a ED |
505 | static u64 ufs_add_fragments(struct inode *inode, u64 fragment, |
506 | unsigned oldcount, unsigned newcount, int *err) | |
1da177e4 LT |
507 | { |
508 | struct super_block * sb; | |
509 | struct ufs_sb_private_info * uspi; | |
510 | struct ufs_super_block_first * usb1; | |
511 | struct ufs_cg_private_info * ucpi; | |
512 | struct ufs_cylinder_group * ucg; | |
513 | unsigned cgno, fragno, fragoff, count, fragsize, i; | |
5dd4056d | 514 | int ret; |
1da177e4 | 515 | |
54fb996a ED |
516 | UFSD("ENTER, fragment %llu, oldcount %u, newcount %u\n", |
517 | (unsigned long long)fragment, oldcount, newcount); | |
1da177e4 LT |
518 | |
519 | sb = inode->i_sb; | |
520 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 521 | usb1 = ubh_get_usb_first (uspi); |
1da177e4 LT |
522 | count = newcount - oldcount; |
523 | ||
54fb996a | 524 | cgno = ufs_dtog(uspi, fragment); |
1da177e4 LT |
525 | if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count) |
526 | return 0; | |
527 | if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb) | |
528 | return 0; | |
529 | ucpi = ufs_load_cylinder (sb, cgno); | |
530 | if (!ucpi) | |
531 | return 0; | |
9695ef16 | 532 | ucg = ubh_get_ucg (UCPI_UBH(ucpi)); |
1da177e4 LT |
533 | if (!ufs_cg_chkmagic(sb, ucg)) { |
534 | ufs_panic (sb, "ufs_add_fragments", | |
535 | "internal error, bad magic number on cg %u", cgno); | |
536 | return 0; | |
537 | } | |
538 | ||
54fb996a | 539 | fragno = ufs_dtogd(uspi, fragment); |
1da177e4 LT |
540 | fragoff = ufs_fragnum (fragno); |
541 | for (i = oldcount; i < newcount; i++) | |
9695ef16 | 542 | if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i)) |
1da177e4 LT |
543 | return 0; |
544 | /* | |
545 | * Block can be extended | |
546 | */ | |
547 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); | |
548 | for (i = newcount; i < (uspi->s_fpb - fragoff); i++) | |
9695ef16 | 549 | if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i)) |
1da177e4 LT |
550 | break; |
551 | fragsize = i - oldcount; | |
552 | if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize])) | |
553 | ufs_panic (sb, "ufs_add_fragments", | |
554 | "internal error or corrupted bitmap on cg %u", cgno); | |
555 | fs32_sub(sb, &ucg->cg_frsum[fragsize], 1); | |
556 | if (fragsize != count) | |
557 | fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1); | |
558 | for (i = oldcount; i < newcount; i++) | |
9695ef16 | 559 | ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i); |
5dd4056d CH |
560 | ret = dquot_alloc_block(inode, count); |
561 | if (ret) { | |
562 | *err = ret; | |
1da177e4 LT |
563 | return 0; |
564 | } | |
565 | ||
566 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); | |
567 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); | |
ee3ffd6c | 568 | uspi->cs_total.cs_nffree -= count; |
1da177e4 | 569 | |
9695ef16 ED |
570 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
571 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); | |
1da177e4 | 572 | if (sb->s_flags & MS_SYNCHRONOUS) { |
098d5af7 | 573 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
9695ef16 | 574 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
1da177e4 LT |
575 | } |
576 | sb->s_dirt = 1; | |
577 | ||
54fb996a | 578 | UFSD("EXIT, fragment %llu\n", (unsigned long long)fragment); |
1da177e4 LT |
579 | |
580 | return fragment; | |
581 | } | |
582 | ||
583 | #define UFS_TEST_FREE_SPACE_CG \ | |
584 | ucg = (struct ufs_cylinder_group *) UFS_SB(sb)->s_ucg[cgno]->b_data; \ | |
585 | if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree)) \ | |
586 | goto cg_found; \ | |
587 | for (k = count; k < uspi->s_fpb; k++) \ | |
588 | if (fs32_to_cpu(sb, ucg->cg_frsum[k])) \ | |
589 | goto cg_found; | |
590 | ||
54fb996a ED |
591 | static u64 ufs_alloc_fragments(struct inode *inode, unsigned cgno, |
592 | u64 goal, unsigned count, int *err) | |
1da177e4 LT |
593 | { |
594 | struct super_block * sb; | |
595 | struct ufs_sb_private_info * uspi; | |
596 | struct ufs_super_block_first * usb1; | |
597 | struct ufs_cg_private_info * ucpi; | |
598 | struct ufs_cylinder_group * ucg; | |
54fb996a ED |
599 | unsigned oldcg, i, j, k, allocsize; |
600 | u64 result; | |
5dd4056d | 601 | int ret; |
1da177e4 | 602 | |
54fb996a ED |
603 | UFSD("ENTER, ino %lu, cgno %u, goal %llu, count %u\n", |
604 | inode->i_ino, cgno, (unsigned long long)goal, count); | |
1da177e4 LT |
605 | |
606 | sb = inode->i_sb; | |
607 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 608 | usb1 = ubh_get_usb_first(uspi); |
1da177e4 LT |
609 | oldcg = cgno; |
610 | ||
611 | /* | |
612 | * 1. searching on preferred cylinder group | |
613 | */ | |
614 | UFS_TEST_FREE_SPACE_CG | |
615 | ||
616 | /* | |
617 | * 2. quadratic rehash | |
618 | */ | |
619 | for (j = 1; j < uspi->s_ncg; j *= 2) { | |
620 | cgno += j; | |
621 | if (cgno >= uspi->s_ncg) | |
622 | cgno -= uspi->s_ncg; | |
623 | UFS_TEST_FREE_SPACE_CG | |
624 | } | |
625 | ||
626 | /* | |
627 | * 3. brute force search | |
628 | * We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step ) | |
629 | */ | |
630 | cgno = (oldcg + 1) % uspi->s_ncg; | |
631 | for (j = 2; j < uspi->s_ncg; j++) { | |
632 | cgno++; | |
633 | if (cgno >= uspi->s_ncg) | |
634 | cgno = 0; | |
635 | UFS_TEST_FREE_SPACE_CG | |
636 | } | |
637 | ||
abf5d15f | 638 | UFSD("EXIT (FAILED)\n"); |
1da177e4 LT |
639 | return 0; |
640 | ||
641 | cg_found: | |
642 | ucpi = ufs_load_cylinder (sb, cgno); | |
643 | if (!ucpi) | |
644 | return 0; | |
9695ef16 | 645 | ucg = ubh_get_ucg (UCPI_UBH(ucpi)); |
1da177e4 LT |
646 | if (!ufs_cg_chkmagic(sb, ucg)) |
647 | ufs_panic (sb, "ufs_alloc_fragments", | |
648 | "internal error, bad magic number on cg %u", cgno); | |
649 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); | |
650 | ||
651 | if (count == uspi->s_fpb) { | |
652 | result = ufs_alloccg_block (inode, ucpi, goal, err); | |
54fb996a | 653 | if (result == INVBLOCK) |
1da177e4 LT |
654 | return 0; |
655 | goto succed; | |
656 | } | |
657 | ||
658 | for (allocsize = count; allocsize < uspi->s_fpb; allocsize++) | |
659 | if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0) | |
660 | break; | |
661 | ||
662 | if (allocsize == uspi->s_fpb) { | |
663 | result = ufs_alloccg_block (inode, ucpi, goal, err); | |
54fb996a | 664 | if (result == INVBLOCK) |
1da177e4 | 665 | return 0; |
54fb996a | 666 | goal = ufs_dtogd(uspi, result); |
1da177e4 | 667 | for (i = count; i < uspi->s_fpb; i++) |
9695ef16 | 668 | ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, goal + i); |
1da177e4 | 669 | i = uspi->s_fpb - count; |
5dd4056d | 670 | dquot_free_block(inode, i); |
1da177e4 LT |
671 | |
672 | fs32_add(sb, &ucg->cg_cs.cs_nffree, i); | |
ee3ffd6c | 673 | uspi->cs_total.cs_nffree += i; |
1da177e4 LT |
674 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i); |
675 | fs32_add(sb, &ucg->cg_frsum[i], 1); | |
676 | goto succed; | |
677 | } | |
678 | ||
679 | result = ufs_bitmap_search (sb, ucpi, goal, allocsize); | |
54fb996a | 680 | if (result == INVBLOCK) |
1da177e4 | 681 | return 0; |
5dd4056d CH |
682 | ret = dquot_alloc_block(inode, count); |
683 | if (ret) { | |
684 | *err = ret; | |
1da177e4 LT |
685 | return 0; |
686 | } | |
687 | for (i = 0; i < count; i++) | |
9695ef16 | 688 | ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, result + i); |
1da177e4 LT |
689 | |
690 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); | |
ee3ffd6c | 691 | uspi->cs_total.cs_nffree -= count; |
1da177e4 LT |
692 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); |
693 | fs32_sub(sb, &ucg->cg_frsum[allocsize], 1); | |
694 | ||
695 | if (count != allocsize) | |
696 | fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1); | |
697 | ||
698 | succed: | |
9695ef16 ED |
699 | ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
700 | ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); | |
1da177e4 | 701 | if (sb->s_flags & MS_SYNCHRONOUS) { |
098d5af7 | 702 | ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi)); |
9695ef16 | 703 | ubh_wait_on_buffer (UCPI_UBH(ucpi)); |
1da177e4 LT |
704 | } |
705 | sb->s_dirt = 1; | |
706 | ||
707 | result += cgno * uspi->s_fpg; | |
54fb996a | 708 | UFSD("EXIT3, result %llu\n", (unsigned long long)result); |
1da177e4 LT |
709 | return result; |
710 | } | |
711 | ||
54fb996a ED |
712 | static u64 ufs_alloccg_block(struct inode *inode, |
713 | struct ufs_cg_private_info *ucpi, | |
714 | u64 goal, int *err) | |
1da177e4 LT |
715 | { |
716 | struct super_block * sb; | |
717 | struct ufs_sb_private_info * uspi; | |
718 | struct ufs_super_block_first * usb1; | |
719 | struct ufs_cylinder_group * ucg; | |
54fb996a | 720 | u64 result, blkno; |
5dd4056d | 721 | int ret; |
1da177e4 | 722 | |
54fb996a | 723 | UFSD("ENTER, goal %llu\n", (unsigned long long)goal); |
1da177e4 LT |
724 | |
725 | sb = inode->i_sb; | |
726 | uspi = UFS_SB(sb)->s_uspi; | |
7b4ee73e | 727 | usb1 = ubh_get_usb_first(uspi); |
9695ef16 | 728 | ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
1da177e4 LT |
729 | |
730 | if (goal == 0) { | |
731 | goal = ucpi->c_rotor; | |
732 | goto norot; | |
733 | } | |
734 | goal = ufs_blknum (goal); | |
54fb996a | 735 | goal = ufs_dtogd(uspi, goal); |
1da177e4 LT |
736 | |
737 | /* | |
738 | * If the requested block is available, use it. | |
739 | */ | |
9695ef16 | 740 | if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, ufs_fragstoblks(goal))) { |
1da177e4 LT |
741 | result = goal; |
742 | goto gotit; | |
743 | } | |
744 | ||
745 | norot: | |
746 | result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb); | |
54fb996a ED |
747 | if (result == INVBLOCK) |
748 | return INVBLOCK; | |
1da177e4 LT |
749 | ucpi->c_rotor = result; |
750 | gotit: | |
751 | blkno = ufs_fragstoblks(result); | |
9695ef16 | 752 | ubh_clrblock (UCPI_UBH(ucpi), ucpi->c_freeoff, blkno); |
1da177e4 LT |
753 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) |
754 | ufs_clusteracct (sb, ucpi, blkno, -1); | |
5dd4056d CH |
755 | ret = dquot_alloc_block(inode, uspi->s_fpb); |
756 | if (ret) { | |
757 | *err = ret; | |
54fb996a | 758 | return INVBLOCK; |
1da177e4 LT |
759 | } |
760 | ||
761 | fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1); | |
ee3ffd6c | 762 | uspi->cs_total.cs_nbfree--; |
1da177e4 | 763 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1); |
54fb996a ED |
764 | |
765 | if (uspi->fs_magic != UFS2_MAGIC) { | |
766 | unsigned cylno = ufs_cbtocylno((unsigned)result); | |
767 | ||
768 | fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, | |
769 | ufs_cbtorpos((unsigned)result)), 1); | |
770 | fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
771 | } | |
1da177e4 | 772 | |
54fb996a | 773 | UFSD("EXIT, result %llu\n", (unsigned long long)result); |
1da177e4 LT |
774 | |
775 | return result; | |
776 | } | |
777 | ||
3e41f597 ED |
778 | static unsigned ubh_scanc(struct ufs_sb_private_info *uspi, |
779 | struct ufs_buffer_head *ubh, | |
780 | unsigned begin, unsigned size, | |
781 | unsigned char *table, unsigned char mask) | |
1da177e4 | 782 | { |
3e41f597 ED |
783 | unsigned rest, offset; |
784 | unsigned char *cp; | |
1da177e4 | 785 | |
1da177e4 | 786 | |
3e41f597 ED |
787 | offset = begin & ~uspi->s_fmask; |
788 | begin >>= uspi->s_fshift; | |
789 | for (;;) { | |
790 | if ((offset + size) < uspi->s_fsize) | |
791 | rest = size; | |
792 | else | |
793 | rest = uspi->s_fsize - offset; | |
794 | size -= rest; | |
795 | cp = ubh->bh[begin]->b_data + offset; | |
796 | while ((table[*cp++] & mask) == 0 && --rest) | |
797 | ; | |
798 | if (rest || !size) | |
799 | break; | |
800 | begin++; | |
801 | offset = 0; | |
802 | } | |
803 | return (size + rest); | |
804 | } | |
805 | ||
806 | /* | |
807 | * Find a block of the specified size in the specified cylinder group. | |
808 | * @sp: pointer to super block | |
809 | * @ucpi: pointer to cylinder group info | |
810 | * @goal: near which block we want find new one | |
811 | * @count: specified size | |
812 | */ | |
54fb996a ED |
813 | static u64 ufs_bitmap_search(struct super_block *sb, |
814 | struct ufs_cg_private_info *ucpi, | |
815 | u64 goal, unsigned count) | |
3e41f597 ED |
816 | { |
817 | /* | |
818 | * Bit patterns for identifying fragments in the block map | |
819 | * used as ((map & mask_arr) == want_arr) | |
820 | */ | |
821 | static const int mask_arr[9] = { | |
822 | 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff | |
823 | }; | |
824 | static const int want_arr[9] = { | |
825 | 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe | |
826 | }; | |
827 | struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; | |
828 | struct ufs_super_block_first *usb1; | |
829 | struct ufs_cylinder_group *ucg; | |
54fb996a | 830 | unsigned start, length, loc; |
3e41f597 | 831 | unsigned pos, want, blockmap, mask, end; |
54fb996a | 832 | u64 result; |
3e41f597 | 833 | |
54fb996a ED |
834 | UFSD("ENTER, cg %u, goal %llu, count %u\n", ucpi->c_cgx, |
835 | (unsigned long long)goal, count); | |
3e41f597 | 836 | |
7b4ee73e | 837 | usb1 = ubh_get_usb_first (uspi); |
9695ef16 | 838 | ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
1da177e4 LT |
839 | |
840 | if (goal) | |
54fb996a | 841 | start = ufs_dtogd(uspi, goal) >> 3; |
1da177e4 LT |
842 | else |
843 | start = ucpi->c_frotor >> 3; | |
844 | ||
845 | length = ((uspi->s_fpg + 7) >> 3) - start; | |
3e41f597 | 846 | loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff + start, length, |
1da177e4 LT |
847 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, |
848 | 1 << (count - 1 + (uspi->s_fpb & 7))); | |
3e41f597 | 849 | if (loc == 0) { |
1da177e4 | 850 | length = start + 1; |
3e41f597 ED |
851 | loc = ubh_scanc(uspi, UCPI_UBH(ucpi), ucpi->c_freeoff, length, |
852 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : | |
853 | ufs_fragtable_other, | |
854 | 1 << (count - 1 + (uspi->s_fpb & 7))); | |
855 | if (loc == 0) { | |
856 | ufs_error(sb, "ufs_bitmap_search", | |
857 | "bitmap corrupted on cg %u, start %u," | |
858 | " length %u, count %u, freeoff %u\n", | |
859 | ucpi->c_cgx, start, length, count, | |
860 | ucpi->c_freeoff); | |
54fb996a | 861 | return INVBLOCK; |
1da177e4 LT |
862 | } |
863 | start = 0; | |
864 | } | |
3e41f597 | 865 | result = (start + length - loc) << 3; |
1da177e4 LT |
866 | ucpi->c_frotor = result; |
867 | ||
868 | /* | |
869 | * found the byte in the map | |
870 | */ | |
3e41f597 ED |
871 | |
872 | for (end = result + 8; result < end; result += uspi->s_fpb) { | |
873 | blockmap = ubh_blkmap(UCPI_UBH(ucpi), ucpi->c_freeoff, result); | |
874 | blockmap <<= 1; | |
875 | mask = mask_arr[count]; | |
876 | want = want_arr[count]; | |
877 | for (pos = 0; pos <= uspi->s_fpb - count; pos++) { | |
878 | if ((blockmap & mask) == want) { | |
54fb996a ED |
879 | UFSD("EXIT, result %llu\n", |
880 | (unsigned long long)result); | |
3e41f597 ED |
881 | return result + pos; |
882 | } | |
883 | mask <<= 1; | |
884 | want <<= 1; | |
885 | } | |
886 | } | |
887 | ||
888 | ufs_error(sb, "ufs_bitmap_search", "block not in map on cg %u\n", | |
889 | ucpi->c_cgx); | |
abf5d15f | 890 | UFSD("EXIT (FAILED)\n"); |
54fb996a | 891 | return INVBLOCK; |
1da177e4 LT |
892 | } |
893 | ||
894 | static void ufs_clusteracct(struct super_block * sb, | |
895 | struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt) | |
896 | { | |
897 | struct ufs_sb_private_info * uspi; | |
898 | int i, start, end, forw, back; | |
899 | ||
900 | uspi = UFS_SB(sb)->s_uspi; | |
901 | if (uspi->s_contigsumsize <= 0) | |
902 | return; | |
903 | ||
904 | if (cnt > 0) | |
9695ef16 | 905 | ubh_setbit(UCPI_UBH(ucpi), ucpi->c_clusteroff, blkno); |
1da177e4 | 906 | else |
9695ef16 | 907 | ubh_clrbit(UCPI_UBH(ucpi), ucpi->c_clusteroff, blkno); |
1da177e4 LT |
908 | |
909 | /* | |
910 | * Find the size of the cluster going forward. | |
911 | */ | |
912 | start = blkno + 1; | |
913 | end = start + uspi->s_contigsumsize; | |
914 | if ( end >= ucpi->c_nclusterblks) | |
915 | end = ucpi->c_nclusterblks; | |
9695ef16 | 916 | i = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_clusteroff, end, start); |
1da177e4 LT |
917 | if (i > end) |
918 | i = end; | |
919 | forw = i - start; | |
920 | ||
921 | /* | |
922 | * Find the size of the cluster going backward. | |
923 | */ | |
924 | start = blkno - 1; | |
925 | end = start - uspi->s_contigsumsize; | |
926 | if (end < 0 ) | |
927 | end = -1; | |
9695ef16 | 928 | i = ubh_find_last_zero_bit (UCPI_UBH(ucpi), ucpi->c_clusteroff, start, end); |
1da177e4 LT |
929 | if ( i < end) |
930 | i = end; | |
931 | back = start - i; | |
932 | ||
933 | /* | |
934 | * Account for old cluster and the possibly new forward and | |
935 | * back clusters. | |
936 | */ | |
937 | i = back + forw + 1; | |
938 | if (i > uspi->s_contigsumsize) | |
939 | i = uspi->s_contigsumsize; | |
9695ef16 | 940 | fs32_add(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (i << 2)), cnt); |
1da177e4 | 941 | if (back > 0) |
9695ef16 | 942 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (back << 2)), cnt); |
1da177e4 | 943 | if (forw > 0) |
9695ef16 | 944 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH(ucpi), ucpi->c_clustersumoff + (forw << 2)), cnt); |
1da177e4 LT |
945 | } |
946 | ||
947 | ||
948 | static unsigned char ufs_fragtable_8fpb[] = { | |
949 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, | |
950 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, | |
951 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
952 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, | |
953 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
954 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
955 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, | |
956 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40, | |
957 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
958 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
959 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
960 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, | |
961 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, | |
962 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12, | |
963 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C, | |
964 | 0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, | |
965 | }; | |
966 | ||
967 | static unsigned char ufs_fragtable_other[] = { | |
968 | 0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A, | |
969 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
970 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
971 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, | |
972 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
973 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
974 | 0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE, | |
975 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, | |
976 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
977 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
978 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
979 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, | |
980 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, | |
981 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, | |
982 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, | |
983 | 0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A, | |
984 | }; |