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Commit | Line | Data |
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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 | |
7 | */ | |
8 | ||
9 | #include <linux/fs.h> | |
10 | #include <linux/ufs_fs.h> | |
11 | #include <linux/stat.h> | |
12 | #include <linux/time.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/quotaops.h> | |
15 | #include <linux/buffer_head.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <asm/byteorder.h> | |
19 | ||
20 | #include "swab.h" | |
21 | #include "util.h" | |
22 | ||
23 | #undef UFS_BALLOC_DEBUG | |
24 | ||
25 | #ifdef UFS_BALLOC_DEBUG | |
26 | #define UFSD(x) printk("(%s, %d), %s:", __FILE__, __LINE__, __FUNCTION__); printk x; | |
27 | #else | |
28 | #define UFSD(x) | |
29 | #endif | |
30 | ||
31 | static unsigned ufs_add_fragments (struct inode *, unsigned, unsigned, unsigned, int *); | |
32 | static unsigned ufs_alloc_fragments (struct inode *, unsigned, unsigned, unsigned, int *); | |
33 | static unsigned ufs_alloccg_block (struct inode *, struct ufs_cg_private_info *, unsigned, int *); | |
34 | static unsigned ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, unsigned, unsigned); | |
35 | static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[]; | |
36 | static void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int); | |
37 | ||
38 | /* | |
39 | * Free 'count' fragments from fragment number 'fragment' | |
40 | */ | |
41 | void ufs_free_fragments (struct inode * inode, unsigned fragment, unsigned count) { | |
42 | struct super_block * sb; | |
43 | struct ufs_sb_private_info * uspi; | |
44 | struct ufs_super_block_first * usb1; | |
45 | struct ufs_cg_private_info * ucpi; | |
46 | struct ufs_cylinder_group * ucg; | |
47 | unsigned cgno, bit, end_bit, bbase, blkmap, i, blkno, cylno; | |
48 | ||
49 | sb = inode->i_sb; | |
50 | uspi = UFS_SB(sb)->s_uspi; | |
51 | usb1 = ubh_get_usb_first(USPI_UBH); | |
52 | ||
53 | UFSD(("ENTER, fragment %u, count %u\n", fragment, count)) | |
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 | ||
60 | cgno = ufs_dtog(fragment); | |
61 | bit = ufs_dtogd(fragment); | |
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; | |
70 | ucg = ubh_get_ucg (UCPI_UBH); | |
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); | |
78 | blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase); | |
79 | ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1); | |
80 | for (i = bit; i < end_bit; i++) { | |
81 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, i)) | |
82 | ubh_setbit (UCPI_UBH, ucpi->c_freeoff, i); | |
83 | else ufs_error (sb, "ufs_free_fragments", | |
84 | "bit already cleared for fragment %u", i); | |
85 | } | |
86 | ||
87 | DQUOT_FREE_BLOCK (inode, count); | |
88 | ||
89 | ||
90 | fs32_add(sb, &ucg->cg_cs.cs_nffree, count); | |
91 | fs32_add(sb, &usb1->fs_cstotal.cs_nffree, count); | |
92 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); | |
93 | blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase); | |
94 | ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1); | |
95 | ||
96 | /* | |
97 | * Trying to reassemble free fragments into block | |
98 | */ | |
99 | blkno = ufs_fragstoblks (bbase); | |
100 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) { | |
101 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb); | |
102 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, uspi->s_fpb); | |
103 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb); | |
104 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) | |
105 | ufs_clusteracct (sb, ucpi, blkno, 1); | |
106 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); | |
107 | fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1); | |
108 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); | |
109 | cylno = ufs_cbtocylno (bbase); | |
110 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(bbase)), 1); | |
111 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
112 | } | |
113 | ||
114 | ubh_mark_buffer_dirty (USPI_UBH); | |
115 | ubh_mark_buffer_dirty (UCPI_UBH); | |
116 | if (sb->s_flags & MS_SYNCHRONOUS) { | |
117 | ubh_wait_on_buffer (UCPI_UBH); | |
118 | ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi); | |
119 | ubh_wait_on_buffer (UCPI_UBH); | |
120 | } | |
121 | sb->s_dirt = 1; | |
122 | ||
123 | unlock_super (sb); | |
124 | UFSD(("EXIT\n")) | |
125 | return; | |
126 | ||
127 | failed: | |
128 | unlock_super (sb); | |
129 | UFSD(("EXIT (FAILED)\n")) | |
130 | return; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Free 'count' fragments from fragment number 'fragment' (free whole blocks) | |
135 | */ | |
136 | void ufs_free_blocks (struct inode * inode, unsigned fragment, unsigned count) { | |
137 | struct super_block * sb; | |
138 | struct ufs_sb_private_info * uspi; | |
139 | struct ufs_super_block_first * usb1; | |
140 | struct ufs_cg_private_info * ucpi; | |
141 | struct ufs_cylinder_group * ucg; | |
142 | unsigned overflow, cgno, bit, end_bit, blkno, i, cylno; | |
143 | ||
144 | sb = inode->i_sb; | |
145 | uspi = UFS_SB(sb)->s_uspi; | |
146 | usb1 = ubh_get_usb_first(USPI_UBH); | |
147 | ||
148 | UFSD(("ENTER, fragment %u, count %u\n", fragment, count)) | |
149 | ||
150 | if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) { | |
151 | ufs_error (sb, "ufs_free_blocks", "internal error, " | |
152 | "fragment %u, count %u\n", fragment, count); | |
153 | goto failed; | |
154 | } | |
155 | ||
156 | lock_super(sb); | |
157 | ||
158 | do_more: | |
159 | overflow = 0; | |
160 | cgno = ufs_dtog (fragment); | |
161 | bit = ufs_dtogd (fragment); | |
162 | if (cgno >= uspi->s_ncg) { | |
163 | ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device"); | |
164 | goto failed; | |
165 | } | |
166 | end_bit = bit + count; | |
167 | if (end_bit > uspi->s_fpg) { | |
168 | overflow = bit + count - uspi->s_fpg; | |
169 | count -= overflow; | |
170 | end_bit -= overflow; | |
171 | } | |
172 | ||
173 | ucpi = ufs_load_cylinder (sb, cgno); | |
174 | if (!ucpi) | |
175 | goto failed; | |
176 | ucg = ubh_get_ucg (UCPI_UBH); | |
177 | if (!ufs_cg_chkmagic(sb, ucg)) { | |
178 | ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno); | |
179 | goto failed; | |
180 | } | |
181 | ||
182 | for (i = bit; i < end_bit; i += uspi->s_fpb) { | |
183 | blkno = ufs_fragstoblks(i); | |
184 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) { | |
185 | ufs_error(sb, "ufs_free_blocks", "freeing free fragment"); | |
186 | } | |
187 | ubh_setblock(UCPI_UBH, ucpi->c_freeoff, blkno); | |
188 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) | |
189 | ufs_clusteracct (sb, ucpi, blkno, 1); | |
190 | DQUOT_FREE_BLOCK(inode, uspi->s_fpb); | |
191 | ||
192 | fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1); | |
193 | fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1); | |
194 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nbfree, 1); | |
195 | cylno = ufs_cbtocylno(i); | |
196 | fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(i)), 1); | |
197 | fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
198 | } | |
199 | ||
200 | ubh_mark_buffer_dirty (USPI_UBH); | |
201 | ubh_mark_buffer_dirty (UCPI_UBH); | |
202 | if (sb->s_flags & MS_SYNCHRONOUS) { | |
203 | ubh_wait_on_buffer (UCPI_UBH); | |
204 | ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi); | |
205 | ubh_wait_on_buffer (UCPI_UBH); | |
206 | } | |
207 | ||
208 | if (overflow) { | |
209 | fragment += count; | |
210 | count = overflow; | |
211 | goto do_more; | |
212 | } | |
213 | ||
214 | sb->s_dirt = 1; | |
215 | unlock_super (sb); | |
216 | UFSD(("EXIT\n")) | |
217 | return; | |
218 | ||
219 | failed: | |
220 | unlock_super (sb); | |
221 | UFSD(("EXIT (FAILED)\n")) | |
222 | return; | |
223 | } | |
224 | ||
225 | ||
226 | ||
227 | #define NULLIFY_FRAGMENTS \ | |
228 | for (i = oldcount; i < newcount; i++) { \ | |
229 | bh = sb_getblk(sb, result + i); \ | |
230 | memset (bh->b_data, 0, sb->s_blocksize); \ | |
231 | set_buffer_uptodate(bh); \ | |
232 | mark_buffer_dirty (bh); \ | |
233 | if (IS_SYNC(inode)) \ | |
234 | sync_dirty_buffer(bh); \ | |
235 | brelse (bh); \ | |
236 | } | |
237 | ||
238 | unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment, | |
239 | unsigned goal, unsigned count, int * err ) | |
240 | { | |
241 | struct super_block * sb; | |
242 | struct ufs_sb_private_info * uspi; | |
243 | struct ufs_super_block_first * usb1; | |
244 | struct buffer_head * bh; | |
245 | unsigned cgno, oldcount, newcount, tmp, request, i, result; | |
246 | ||
247 | UFSD(("ENTER, ino %lu, fragment %u, goal %u, count %u\n", inode->i_ino, fragment, goal, count)) | |
248 | ||
249 | sb = inode->i_sb; | |
250 | uspi = UFS_SB(sb)->s_uspi; | |
251 | usb1 = ubh_get_usb_first(USPI_UBH); | |
252 | *err = -ENOSPC; | |
253 | ||
254 | lock_super (sb); | |
255 | ||
256 | tmp = fs32_to_cpu(sb, *p); | |
257 | if (count + ufs_fragnum(fragment) > uspi->s_fpb) { | |
258 | ufs_warning (sb, "ufs_new_fragments", "internal warning" | |
259 | " fragment %u, count %u", fragment, count); | |
260 | count = uspi->s_fpb - ufs_fragnum(fragment); | |
261 | } | |
262 | oldcount = ufs_fragnum (fragment); | |
263 | newcount = oldcount + count; | |
264 | ||
265 | /* | |
266 | * Somebody else has just allocated our fragments | |
267 | */ | |
268 | if (oldcount) { | |
269 | if (!tmp) { | |
270 | ufs_error (sb, "ufs_new_fragments", "internal error, " | |
271 | "fragment %u, tmp %u\n", fragment, tmp); | |
272 | unlock_super (sb); | |
273 | return (unsigned)-1; | |
274 | } | |
275 | if (fragment < UFS_I(inode)->i_lastfrag) { | |
276 | UFSD(("EXIT (ALREADY ALLOCATED)\n")) | |
277 | unlock_super (sb); | |
278 | return 0; | |
279 | } | |
280 | } | |
281 | else { | |
282 | if (tmp) { | |
283 | UFSD(("EXIT (ALREADY ALLOCATED)\n")) | |
284 | unlock_super(sb); | |
285 | return 0; | |
286 | } | |
287 | } | |
288 | ||
289 | /* | |
290 | * There is not enough space for user on the device | |
291 | */ | |
292 | if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(usb1, UFS_MINFREE) <= 0) { | |
293 | unlock_super (sb); | |
294 | UFSD(("EXIT (FAILED)\n")) | |
295 | return 0; | |
296 | } | |
297 | ||
298 | if (goal >= uspi->s_size) | |
299 | goal = 0; | |
300 | if (goal == 0) | |
301 | cgno = ufs_inotocg (inode->i_ino); | |
302 | else | |
303 | cgno = ufs_dtog (goal); | |
304 | ||
305 | /* | |
306 | * allocate new fragment | |
307 | */ | |
308 | if (oldcount == 0) { | |
309 | result = ufs_alloc_fragments (inode, cgno, goal, count, err); | |
310 | if (result) { | |
311 | *p = cpu_to_fs32(sb, result); | |
312 | *err = 0; | |
313 | inode->i_blocks += count << uspi->s_nspfshift; | |
314 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); | |
315 | NULLIFY_FRAGMENTS | |
316 | } | |
317 | unlock_super(sb); | |
318 | UFSD(("EXIT, result %u\n", result)) | |
319 | return result; | |
320 | } | |
321 | ||
322 | /* | |
323 | * resize block | |
324 | */ | |
325 | result = ufs_add_fragments (inode, tmp, oldcount, newcount, err); | |
326 | if (result) { | |
327 | *err = 0; | |
328 | inode->i_blocks += count << uspi->s_nspfshift; | |
329 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); | |
330 | NULLIFY_FRAGMENTS | |
331 | unlock_super(sb); | |
332 | UFSD(("EXIT, result %u\n", result)) | |
333 | return result; | |
334 | } | |
335 | ||
336 | /* | |
337 | * allocate new block and move data | |
338 | */ | |
339 | switch (fs32_to_cpu(sb, usb1->fs_optim)) { | |
340 | case UFS_OPTSPACE: | |
341 | request = newcount; | |
342 | if (uspi->s_minfree < 5 || fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) | |
343 | > uspi->s_dsize * uspi->s_minfree / (2 * 100) ) | |
344 | break; | |
345 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
346 | break; | |
347 | default: | |
348 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
349 | ||
350 | case UFS_OPTTIME: | |
351 | request = uspi->s_fpb; | |
352 | if (fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) < uspi->s_dsize * | |
353 | (uspi->s_minfree - 2) / 100) | |
354 | break; | |
355 | usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME); | |
356 | break; | |
357 | } | |
358 | result = ufs_alloc_fragments (inode, cgno, goal, request, err); | |
359 | if (result) { | |
360 | for (i = 0; i < oldcount; i++) { | |
361 | bh = sb_bread(sb, tmp + i); | |
362 | if(bh) | |
363 | { | |
364 | clear_buffer_dirty(bh); | |
365 | bh->b_blocknr = result + i; | |
366 | mark_buffer_dirty (bh); | |
367 | if (IS_SYNC(inode)) | |
368 | sync_dirty_buffer(bh); | |
369 | brelse (bh); | |
370 | } | |
371 | else | |
372 | { | |
373 | printk(KERN_ERR "ufs_new_fragments: bread fail\n"); | |
374 | unlock_super(sb); | |
375 | return 0; | |
376 | } | |
377 | } | |
378 | *p = cpu_to_fs32(sb, result); | |
379 | *err = 0; | |
380 | inode->i_blocks += count << uspi->s_nspfshift; | |
381 | UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); | |
382 | NULLIFY_FRAGMENTS | |
383 | unlock_super(sb); | |
384 | if (newcount < request) | |
385 | ufs_free_fragments (inode, result + newcount, request - newcount); | |
386 | ufs_free_fragments (inode, tmp, oldcount); | |
387 | UFSD(("EXIT, result %u\n", result)) | |
388 | return result; | |
389 | } | |
390 | ||
391 | unlock_super(sb); | |
392 | UFSD(("EXIT (FAILED)\n")) | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static unsigned | |
397 | ufs_add_fragments (struct inode * inode, unsigned fragment, | |
398 | unsigned oldcount, unsigned newcount, int * err) | |
399 | { | |
400 | struct super_block * sb; | |
401 | struct ufs_sb_private_info * uspi; | |
402 | struct ufs_super_block_first * usb1; | |
403 | struct ufs_cg_private_info * ucpi; | |
404 | struct ufs_cylinder_group * ucg; | |
405 | unsigned cgno, fragno, fragoff, count, fragsize, i; | |
406 | ||
407 | UFSD(("ENTER, fragment %u, oldcount %u, newcount %u\n", fragment, oldcount, newcount)) | |
408 | ||
409 | sb = inode->i_sb; | |
410 | uspi = UFS_SB(sb)->s_uspi; | |
411 | usb1 = ubh_get_usb_first (USPI_UBH); | |
412 | count = newcount - oldcount; | |
413 | ||
414 | cgno = ufs_dtog(fragment); | |
415 | if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count) | |
416 | return 0; | |
417 | if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb) | |
418 | return 0; | |
419 | ucpi = ufs_load_cylinder (sb, cgno); | |
420 | if (!ucpi) | |
421 | return 0; | |
422 | ucg = ubh_get_ucg (UCPI_UBH); | |
423 | if (!ufs_cg_chkmagic(sb, ucg)) { | |
424 | ufs_panic (sb, "ufs_add_fragments", | |
425 | "internal error, bad magic number on cg %u", cgno); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | fragno = ufs_dtogd (fragment); | |
430 | fragoff = ufs_fragnum (fragno); | |
431 | for (i = oldcount; i < newcount; i++) | |
432 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i)) | |
433 | return 0; | |
434 | /* | |
435 | * Block can be extended | |
436 | */ | |
437 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); | |
438 | for (i = newcount; i < (uspi->s_fpb - fragoff); i++) | |
439 | if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i)) | |
440 | break; | |
441 | fragsize = i - oldcount; | |
442 | if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize])) | |
443 | ufs_panic (sb, "ufs_add_fragments", | |
444 | "internal error or corrupted bitmap on cg %u", cgno); | |
445 | fs32_sub(sb, &ucg->cg_frsum[fragsize], 1); | |
446 | if (fragsize != count) | |
447 | fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1); | |
448 | for (i = oldcount; i < newcount; i++) | |
449 | ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, fragno + i); | |
450 | if(DQUOT_ALLOC_BLOCK(inode, count)) { | |
451 | *err = -EDQUOT; | |
452 | return 0; | |
453 | } | |
454 | ||
455 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); | |
456 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); | |
457 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count); | |
458 | ||
459 | ubh_mark_buffer_dirty (USPI_UBH); | |
460 | ubh_mark_buffer_dirty (UCPI_UBH); | |
461 | if (sb->s_flags & MS_SYNCHRONOUS) { | |
462 | ubh_wait_on_buffer (UCPI_UBH); | |
463 | ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi); | |
464 | ubh_wait_on_buffer (UCPI_UBH); | |
465 | } | |
466 | sb->s_dirt = 1; | |
467 | ||
468 | UFSD(("EXIT, fragment %u\n", fragment)) | |
469 | ||
470 | return fragment; | |
471 | } | |
472 | ||
473 | #define UFS_TEST_FREE_SPACE_CG \ | |
474 | ucg = (struct ufs_cylinder_group *) UFS_SB(sb)->s_ucg[cgno]->b_data; \ | |
475 | if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree)) \ | |
476 | goto cg_found; \ | |
477 | for (k = count; k < uspi->s_fpb; k++) \ | |
478 | if (fs32_to_cpu(sb, ucg->cg_frsum[k])) \ | |
479 | goto cg_found; | |
480 | ||
481 | static unsigned ufs_alloc_fragments (struct inode * inode, unsigned cgno, | |
482 | unsigned goal, unsigned count, int * err) | |
483 | { | |
484 | struct super_block * sb; | |
485 | struct ufs_sb_private_info * uspi; | |
486 | struct ufs_super_block_first * usb1; | |
487 | struct ufs_cg_private_info * ucpi; | |
488 | struct ufs_cylinder_group * ucg; | |
489 | unsigned oldcg, i, j, k, result, allocsize; | |
490 | ||
491 | UFSD(("ENTER, ino %lu, cgno %u, goal %u, count %u\n", inode->i_ino, cgno, goal, count)) | |
492 | ||
493 | sb = inode->i_sb; | |
494 | uspi = UFS_SB(sb)->s_uspi; | |
495 | usb1 = ubh_get_usb_first(USPI_UBH); | |
496 | oldcg = cgno; | |
497 | ||
498 | /* | |
499 | * 1. searching on preferred cylinder group | |
500 | */ | |
501 | UFS_TEST_FREE_SPACE_CG | |
502 | ||
503 | /* | |
504 | * 2. quadratic rehash | |
505 | */ | |
506 | for (j = 1; j < uspi->s_ncg; j *= 2) { | |
507 | cgno += j; | |
508 | if (cgno >= uspi->s_ncg) | |
509 | cgno -= uspi->s_ncg; | |
510 | UFS_TEST_FREE_SPACE_CG | |
511 | } | |
512 | ||
513 | /* | |
514 | * 3. brute force search | |
515 | * We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step ) | |
516 | */ | |
517 | cgno = (oldcg + 1) % uspi->s_ncg; | |
518 | for (j = 2; j < uspi->s_ncg; j++) { | |
519 | cgno++; | |
520 | if (cgno >= uspi->s_ncg) | |
521 | cgno = 0; | |
522 | UFS_TEST_FREE_SPACE_CG | |
523 | } | |
524 | ||
525 | UFSD(("EXIT (FAILED)\n")) | |
526 | return 0; | |
527 | ||
528 | cg_found: | |
529 | ucpi = ufs_load_cylinder (sb, cgno); | |
530 | if (!ucpi) | |
531 | return 0; | |
532 | ucg = ubh_get_ucg (UCPI_UBH); | |
533 | if (!ufs_cg_chkmagic(sb, ucg)) | |
534 | ufs_panic (sb, "ufs_alloc_fragments", | |
535 | "internal error, bad magic number on cg %u", cgno); | |
536 | ucg->cg_time = cpu_to_fs32(sb, get_seconds()); | |
537 | ||
538 | if (count == uspi->s_fpb) { | |
539 | result = ufs_alloccg_block (inode, ucpi, goal, err); | |
540 | if (result == (unsigned)-1) | |
541 | return 0; | |
542 | goto succed; | |
543 | } | |
544 | ||
545 | for (allocsize = count; allocsize < uspi->s_fpb; allocsize++) | |
546 | if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0) | |
547 | break; | |
548 | ||
549 | if (allocsize == uspi->s_fpb) { | |
550 | result = ufs_alloccg_block (inode, ucpi, goal, err); | |
551 | if (result == (unsigned)-1) | |
552 | return 0; | |
553 | goal = ufs_dtogd (result); | |
554 | for (i = count; i < uspi->s_fpb; i++) | |
555 | ubh_setbit (UCPI_UBH, ucpi->c_freeoff, goal + i); | |
556 | i = uspi->s_fpb - count; | |
557 | DQUOT_FREE_BLOCK(inode, i); | |
558 | ||
559 | fs32_add(sb, &ucg->cg_cs.cs_nffree, i); | |
560 | fs32_add(sb, &usb1->fs_cstotal.cs_nffree, i); | |
561 | fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i); | |
562 | fs32_add(sb, &ucg->cg_frsum[i], 1); | |
563 | goto succed; | |
564 | } | |
565 | ||
566 | result = ufs_bitmap_search (sb, ucpi, goal, allocsize); | |
567 | if (result == (unsigned)-1) | |
568 | return 0; | |
569 | if(DQUOT_ALLOC_BLOCK(inode, count)) { | |
570 | *err = -EDQUOT; | |
571 | return 0; | |
572 | } | |
573 | for (i = 0; i < count; i++) | |
574 | ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, result + i); | |
575 | ||
576 | fs32_sub(sb, &ucg->cg_cs.cs_nffree, count); | |
577 | fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count); | |
578 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count); | |
579 | fs32_sub(sb, &ucg->cg_frsum[allocsize], 1); | |
580 | ||
581 | if (count != allocsize) | |
582 | fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1); | |
583 | ||
584 | succed: | |
585 | ubh_mark_buffer_dirty (USPI_UBH); | |
586 | ubh_mark_buffer_dirty (UCPI_UBH); | |
587 | if (sb->s_flags & MS_SYNCHRONOUS) { | |
588 | ubh_wait_on_buffer (UCPI_UBH); | |
589 | ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi); | |
590 | ubh_wait_on_buffer (UCPI_UBH); | |
591 | } | |
592 | sb->s_dirt = 1; | |
593 | ||
594 | result += cgno * uspi->s_fpg; | |
595 | UFSD(("EXIT3, result %u\n", result)) | |
596 | return result; | |
597 | } | |
598 | ||
599 | static unsigned ufs_alloccg_block (struct inode * inode, | |
600 | struct ufs_cg_private_info * ucpi, unsigned goal, int * err) | |
601 | { | |
602 | struct super_block * sb; | |
603 | struct ufs_sb_private_info * uspi; | |
604 | struct ufs_super_block_first * usb1; | |
605 | struct ufs_cylinder_group * ucg; | |
606 | unsigned result, cylno, blkno; | |
607 | ||
608 | UFSD(("ENTER, goal %u\n", goal)) | |
609 | ||
610 | sb = inode->i_sb; | |
611 | uspi = UFS_SB(sb)->s_uspi; | |
612 | usb1 = ubh_get_usb_first(USPI_UBH); | |
613 | ucg = ubh_get_ucg(UCPI_UBH); | |
614 | ||
615 | if (goal == 0) { | |
616 | goal = ucpi->c_rotor; | |
617 | goto norot; | |
618 | } | |
619 | goal = ufs_blknum (goal); | |
620 | goal = ufs_dtogd (goal); | |
621 | ||
622 | /* | |
623 | * If the requested block is available, use it. | |
624 | */ | |
625 | if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, ufs_fragstoblks(goal))) { | |
626 | result = goal; | |
627 | goto gotit; | |
628 | } | |
629 | ||
630 | norot: | |
631 | result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb); | |
632 | if (result == (unsigned)-1) | |
633 | return (unsigned)-1; | |
634 | ucpi->c_rotor = result; | |
635 | gotit: | |
636 | blkno = ufs_fragstoblks(result); | |
637 | ubh_clrblock (UCPI_UBH, ucpi->c_freeoff, blkno); | |
638 | if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD) | |
639 | ufs_clusteracct (sb, ucpi, blkno, -1); | |
640 | if(DQUOT_ALLOC_BLOCK(inode, uspi->s_fpb)) { | |
641 | *err = -EDQUOT; | |
642 | return (unsigned)-1; | |
643 | } | |
644 | ||
645 | fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1); | |
646 | fs32_sub(sb, &usb1->fs_cstotal.cs_nbfree, 1); | |
647 | fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1); | |
648 | cylno = ufs_cbtocylno(result); | |
649 | fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(result)), 1); | |
650 | fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1); | |
651 | ||
652 | UFSD(("EXIT, result %u\n", result)) | |
653 | ||
654 | return result; | |
655 | } | |
656 | ||
657 | static unsigned ufs_bitmap_search (struct super_block * sb, | |
658 | struct ufs_cg_private_info * ucpi, unsigned goal, unsigned count) | |
659 | { | |
660 | struct ufs_sb_private_info * uspi; | |
661 | struct ufs_super_block_first * usb1; | |
662 | struct ufs_cylinder_group * ucg; | |
663 | unsigned start, length, location, result; | |
664 | unsigned possition, fragsize, blockmap, mask; | |
665 | ||
666 | UFSD(("ENTER, cg %u, goal %u, count %u\n", ucpi->c_cgx, goal, count)) | |
667 | ||
668 | uspi = UFS_SB(sb)->s_uspi; | |
669 | usb1 = ubh_get_usb_first (USPI_UBH); | |
670 | ucg = ubh_get_ucg(UCPI_UBH); | |
671 | ||
672 | if (goal) | |
673 | start = ufs_dtogd(goal) >> 3; | |
674 | else | |
675 | start = ucpi->c_frotor >> 3; | |
676 | ||
677 | length = ((uspi->s_fpg + 7) >> 3) - start; | |
678 | location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff + start, length, | |
679 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, | |
680 | 1 << (count - 1 + (uspi->s_fpb & 7))); | |
681 | if (location == 0) { | |
682 | length = start + 1; | |
683 | location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff, length, | |
684 | (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other, | |
685 | 1 << (count - 1 + (uspi->s_fpb & 7))); | |
686 | if (location == 0) { | |
687 | ufs_error (sb, "ufs_bitmap_search", | |
688 | "bitmap corrupted on cg %u, start %u, length %u, count %u, freeoff %u\n", | |
689 | ucpi->c_cgx, start, length, count, ucpi->c_freeoff); | |
690 | return (unsigned)-1; | |
691 | } | |
692 | start = 0; | |
693 | } | |
694 | result = (start + length - location) << 3; | |
695 | ucpi->c_frotor = result; | |
696 | ||
697 | /* | |
698 | * found the byte in the map | |
699 | */ | |
700 | blockmap = ubh_blkmap(UCPI_UBH, ucpi->c_freeoff, result); | |
701 | fragsize = 0; | |
702 | for (possition = 0, mask = 1; possition < 8; possition++, mask <<= 1) { | |
703 | if (blockmap & mask) { | |
704 | if (!(possition & uspi->s_fpbmask)) | |
705 | fragsize = 1; | |
706 | else | |
707 | fragsize++; | |
708 | } | |
709 | else { | |
710 | if (fragsize == count) { | |
711 | result += possition - count; | |
712 | UFSD(("EXIT, result %u\n", result)) | |
713 | return result; | |
714 | } | |
715 | fragsize = 0; | |
716 | } | |
717 | } | |
718 | if (fragsize == count) { | |
719 | result += possition - count; | |
720 | UFSD(("EXIT, result %u\n", result)) | |
721 | return result; | |
722 | } | |
723 | ufs_error (sb, "ufs_bitmap_search", "block not in map on cg %u\n", ucpi->c_cgx); | |
724 | UFSD(("EXIT (FAILED)\n")) | |
725 | return (unsigned)-1; | |
726 | } | |
727 | ||
728 | static void ufs_clusteracct(struct super_block * sb, | |
729 | struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt) | |
730 | { | |
731 | struct ufs_sb_private_info * uspi; | |
732 | int i, start, end, forw, back; | |
733 | ||
734 | uspi = UFS_SB(sb)->s_uspi; | |
735 | if (uspi->s_contigsumsize <= 0) | |
736 | return; | |
737 | ||
738 | if (cnt > 0) | |
739 | ubh_setbit(UCPI_UBH, ucpi->c_clusteroff, blkno); | |
740 | else | |
741 | ubh_clrbit(UCPI_UBH, ucpi->c_clusteroff, blkno); | |
742 | ||
743 | /* | |
744 | * Find the size of the cluster going forward. | |
745 | */ | |
746 | start = blkno + 1; | |
747 | end = start + uspi->s_contigsumsize; | |
748 | if ( end >= ucpi->c_nclusterblks) | |
749 | end = ucpi->c_nclusterblks; | |
750 | i = ubh_find_next_zero_bit (UCPI_UBH, ucpi->c_clusteroff, end, start); | |
751 | if (i > end) | |
752 | i = end; | |
753 | forw = i - start; | |
754 | ||
755 | /* | |
756 | * Find the size of the cluster going backward. | |
757 | */ | |
758 | start = blkno - 1; | |
759 | end = start - uspi->s_contigsumsize; | |
760 | if (end < 0 ) | |
761 | end = -1; | |
762 | i = ubh_find_last_zero_bit (UCPI_UBH, ucpi->c_clusteroff, start, end); | |
763 | if ( i < end) | |
764 | i = end; | |
765 | back = start - i; | |
766 | ||
767 | /* | |
768 | * Account for old cluster and the possibly new forward and | |
769 | * back clusters. | |
770 | */ | |
771 | i = back + forw + 1; | |
772 | if (i > uspi->s_contigsumsize) | |
773 | i = uspi->s_contigsumsize; | |
774 | fs32_add(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (i << 2)), cnt); | |
775 | if (back > 0) | |
776 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (back << 2)), cnt); | |
777 | if (forw > 0) | |
778 | fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (forw << 2)), cnt); | |
779 | } | |
780 | ||
781 | ||
782 | static unsigned char ufs_fragtable_8fpb[] = { | |
783 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, | |
784 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, | |
785 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
786 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, | |
787 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
788 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
789 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, | |
790 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40, | |
791 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
792 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
793 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
794 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, | |
795 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A, | |
796 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12, | |
797 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C, | |
798 | 0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, | |
799 | }; | |
800 | ||
801 | static unsigned char ufs_fragtable_other[] = { | |
802 | 0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A, | |
803 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
804 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
805 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, | |
806 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
807 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
808 | 0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE, | |
809 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, | |
810 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
811 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
812 | 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E, | |
813 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, | |
814 | 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA, | |
815 | 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE, | |
816 | 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE, | |
817 | 0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A, | |
818 | }; |