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37#include <linux/errno.h>
38#include <linux/fs.h>
39#include <linux/fcntl.h>
40#include <linux/time.h>
41#include <linux/stat.h>
42#include <linux/string.h>
43#include <linux/smp_lock.h>
44#include <linux/buffer_head.h>
45#include <linux/blkdev.h>
46#include <linux/sched.h>
47
48#include "ufs_fs.h"
49#include "ufs.h"
50#include "swab.h"
51#include "util.h"
52
53
54
55
56
57
58
59
60
61
62
63#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
64#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
65
66
67static int ufs_trunc_direct(struct inode *inode)
68{
69 struct ufs_inode_info *ufsi = UFS_I(inode);
70 struct super_block * sb;
71 struct ufs_sb_private_info * uspi;
72 void *p;
73 u64 frag1, frag2, frag3, frag4, block1, block2;
74 unsigned frag_to_free, free_count;
75 unsigned i, tmp;
76 int retry;
77
78 UFSD("ENTER: ino %lu\n", inode->i_ino);
79
80 sb = inode->i_sb;
81 uspi = UFS_SB(sb)->s_uspi;
82
83 frag_to_free = 0;
84 free_count = 0;
85 retry = 0;
86
87 frag1 = DIRECT_FRAGMENT;
88 frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
89 frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
90 frag3 = frag4 & ~uspi->s_fpbmask;
91 block1 = block2 = 0;
92 if (frag2 > frag3) {
93 frag2 = frag4;
94 frag3 = frag4 = 0;
95 } else if (frag2 < frag3) {
96 block1 = ufs_fragstoblks (frag2);
97 block2 = ufs_fragstoblks (frag3);
98 }
99
100 UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
101 " frag3 %llu, frag4 %llu\n", inode->i_ino,
102 (unsigned long long)frag1, (unsigned long long)frag2,
103 (unsigned long long)block1, (unsigned long long)block2,
104 (unsigned long long)frag3, (unsigned long long)frag4);
105
106 if (frag1 >= frag2)
107 goto next1;
108
109
110
111
112 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
113 tmp = ufs_data_ptr_to_cpu(sb, p);
114 if (!tmp )
115 ufs_panic (sb, "ufs_trunc_direct", "internal error");
116 frag2 -= frag1;
117 frag1 = ufs_fragnum (frag1);
118
119 ufs_free_fragments(inode, tmp + frag1, frag2);
120 mark_inode_dirty(inode);
121 frag_to_free = tmp + frag1;
122
123next1:
124
125
126
127 for (i = block1 ; i < block2; i++) {
128 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
129 tmp = ufs_data_ptr_to_cpu(sb, p);
130 if (!tmp)
131 continue;
132 ufs_data_ptr_clear(uspi, p);
133
134 if (free_count == 0) {
135 frag_to_free = tmp;
136 free_count = uspi->s_fpb;
137 } else if (free_count > 0 && frag_to_free == tmp - free_count)
138 free_count += uspi->s_fpb;
139 else {
140 ufs_free_blocks (inode, frag_to_free, free_count);
141 frag_to_free = tmp;
142 free_count = uspi->s_fpb;
143 }
144 mark_inode_dirty(inode);
145 }
146
147 if (free_count > 0)
148 ufs_free_blocks (inode, frag_to_free, free_count);
149
150 if (frag3 >= frag4)
151 goto next3;
152
153
154
155
156 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
157 tmp = ufs_data_ptr_to_cpu(sb, p);
158 if (!tmp )
159 ufs_panic(sb, "ufs_truncate_direct", "internal error");
160 frag4 = ufs_fragnum (frag4);
161 ufs_data_ptr_clear(uspi, p);
162
163 ufs_free_fragments (inode, tmp, frag4);
164 mark_inode_dirty(inode);
165 next3:
166
167 UFSD("EXIT: ino %lu\n", inode->i_ino);
168 return retry;
169}
170
171
172static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
173{
174 struct super_block * sb;
175 struct ufs_sb_private_info * uspi;
176 struct ufs_buffer_head * ind_ubh;
177 void *ind;
178 u64 tmp, indirect_block, i, frag_to_free;
179 unsigned free_count;
180 int retry;
181
182 UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
183 inode->i_ino, (unsigned long long)offset, p);
184
185 BUG_ON(!p);
186
187 sb = inode->i_sb;
188 uspi = UFS_SB(sb)->s_uspi;
189
190 frag_to_free = 0;
191 free_count = 0;
192 retry = 0;
193
194 tmp = ufs_data_ptr_to_cpu(sb, p);
195 if (!tmp)
196 return 0;
197 ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
198 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
199 ubh_brelse (ind_ubh);
200 return 1;
201 }
202 if (!ind_ubh) {
203 ufs_data_ptr_clear(uspi, p);
204 return 0;
205 }
206
207 indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
208 for (i = indirect_block; i < uspi->s_apb; i++) {
209 ind = ubh_get_data_ptr(uspi, ind_ubh, i);
210 tmp = ufs_data_ptr_to_cpu(sb, ind);
211 if (!tmp)
212 continue;
213
214 ufs_data_ptr_clear(uspi, ind);
215 ubh_mark_buffer_dirty(ind_ubh);
216 if (free_count == 0) {
217 frag_to_free = tmp;
218 free_count = uspi->s_fpb;
219 } else if (free_count > 0 && frag_to_free == tmp - free_count)
220 free_count += uspi->s_fpb;
221 else {
222 ufs_free_blocks (inode, frag_to_free, free_count);
223 frag_to_free = tmp;
224 free_count = uspi->s_fpb;
225 }
226
227 mark_inode_dirty(inode);
228 }
229
230 if (free_count > 0) {
231 ufs_free_blocks (inode, frag_to_free, free_count);
232 }
233 for (i = 0; i < uspi->s_apb; i++)
234 if (!ufs_is_data_ptr_zero(uspi,
235 ubh_get_data_ptr(uspi, ind_ubh, i)))
236 break;
237 if (i >= uspi->s_apb) {
238 tmp = ufs_data_ptr_to_cpu(sb, p);
239 ufs_data_ptr_clear(uspi, p);
240
241 ufs_free_blocks (inode, tmp, uspi->s_fpb);
242 mark_inode_dirty(inode);
243 ubh_bforget(ind_ubh);
244 ind_ubh = NULL;
245 }
246 if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
247 ubh_sync_block(ind_ubh);
248 ubh_brelse (ind_ubh);
249
250 UFSD("EXIT: ino %lu\n", inode->i_ino);
251
252 return retry;
253}
254
255static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
256{
257 struct super_block * sb;
258 struct ufs_sb_private_info * uspi;
259 struct ufs_buffer_head *dind_bh;
260 u64 i, tmp, dindirect_block;
261 void *dind;
262 int retry = 0;
263
264 UFSD("ENTER: ino %lu\n", inode->i_ino);
265
266 sb = inode->i_sb;
267 uspi = UFS_SB(sb)->s_uspi;
268
269 dindirect_block = (DIRECT_BLOCK > offset)
270 ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
271 retry = 0;
272
273 tmp = ufs_data_ptr_to_cpu(sb, p);
274 if (!tmp)
275 return 0;
276 dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
277 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
278 ubh_brelse (dind_bh);
279 return 1;
280 }
281 if (!dind_bh) {
282 ufs_data_ptr_clear(uspi, p);
283 return 0;
284 }
285
286 for (i = dindirect_block ; i < uspi->s_apb ; i++) {
287 dind = ubh_get_data_ptr(uspi, dind_bh, i);
288 tmp = ufs_data_ptr_to_cpu(sb, dind);
289 if (!tmp)
290 continue;
291 retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
292 ubh_mark_buffer_dirty(dind_bh);
293 }
294
295 for (i = 0; i < uspi->s_apb; i++)
296 if (!ufs_is_data_ptr_zero(uspi,
297 ubh_get_data_ptr(uspi, dind_bh, i)))
298 break;
299 if (i >= uspi->s_apb) {
300 tmp = ufs_data_ptr_to_cpu(sb, p);
301 ufs_data_ptr_clear(uspi, p);
302
303 ufs_free_blocks(inode, tmp, uspi->s_fpb);
304 mark_inode_dirty(inode);
305 ubh_bforget(dind_bh);
306 dind_bh = NULL;
307 }
308 if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
309 ubh_sync_block(dind_bh);
310 ubh_brelse (dind_bh);
311
312 UFSD("EXIT: ino %lu\n", inode->i_ino);
313
314 return retry;
315}
316
317static int ufs_trunc_tindirect(struct inode *inode)
318{
319 struct super_block *sb = inode->i_sb;
320 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
321 struct ufs_inode_info *ufsi = UFS_I(inode);
322 struct ufs_buffer_head * tind_bh;
323 u64 tindirect_block, tmp, i;
324 void *tind, *p;
325 int retry;
326
327 UFSD("ENTER: ino %lu\n", inode->i_ino);
328
329 retry = 0;
330
331 tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
332 ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
333
334 p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
335 if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
336 return 0;
337 tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
338 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
339 ubh_brelse (tind_bh);
340 return 1;
341 }
342 if (!tind_bh) {
343 ufs_data_ptr_clear(uspi, p);
344 return 0;
345 }
346
347 for (i = tindirect_block ; i < uspi->s_apb ; i++) {
348 tind = ubh_get_data_ptr(uspi, tind_bh, i);
349 retry |= ufs_trunc_dindirect(inode, UFS_NDADDR +
350 uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
351 ubh_mark_buffer_dirty(tind_bh);
352 }
353 for (i = 0; i < uspi->s_apb; i++)
354 if (!ufs_is_data_ptr_zero(uspi,
355 ubh_get_data_ptr(uspi, tind_bh, i)))
356 break;
357 if (i >= uspi->s_apb) {
358 tmp = ufs_data_ptr_to_cpu(sb, p);
359 ufs_data_ptr_clear(uspi, p);
360
361 ufs_free_blocks(inode, tmp, uspi->s_fpb);
362 mark_inode_dirty(inode);
363 ubh_bforget(tind_bh);
364 tind_bh = NULL;
365 }
366 if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
367 ubh_sync_block(tind_bh);
368 ubh_brelse (tind_bh);
369
370 UFSD("EXIT: ino %lu\n", inode->i_ino);
371 return retry;
372}
373
374static int ufs_alloc_lastblock(struct inode *inode)
375{
376 int err = 0;
377 struct super_block *sb = inode->i_sb;
378 struct address_space *mapping = inode->i_mapping;
379 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
380 unsigned i, end;
381 sector_t lastfrag;
382 struct page *lastpage;
383 struct buffer_head *bh;
384 u64 phys64;
385
386 lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
387
388 if (!lastfrag)
389 goto out;
390
391 lastfrag--;
392
393 lastpage = ufs_get_locked_page(mapping, lastfrag >>
394 (PAGE_CACHE_SHIFT - inode->i_blkbits));
395 if (IS_ERR(lastpage)) {
396 err = -EIO;
397 goto out;
398 }
399
400 end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
401 bh = page_buffers(lastpage);
402 for (i = 0; i < end; ++i)
403 bh = bh->b_this_page;
404
405
406 err = ufs_getfrag_block(inode, lastfrag, bh, 1);
407
408 if (unlikely(err))
409 goto out_unlock;
410
411 if (buffer_new(bh)) {
412 clear_buffer_new(bh);
413 unmap_underlying_metadata(bh->b_bdev,
414 bh->b_blocknr);
415
416
417
418
419 set_buffer_uptodate(bh);
420 mark_buffer_dirty(bh);
421 set_page_dirty(lastpage);
422 }
423
424 if (lastfrag >= UFS_IND_FRAGMENT) {
425 end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
426 phys64 = bh->b_blocknr + 1;
427 for (i = 0; i < end; ++i) {
428 bh = sb_getblk(sb, i + phys64);
429 lock_buffer(bh);
430 memset(bh->b_data, 0, sb->s_blocksize);
431 set_buffer_uptodate(bh);
432 mark_buffer_dirty(bh);
433 unlock_buffer(bh);
434 sync_dirty_buffer(bh);
435 brelse(bh);
436 }
437 }
438out_unlock:
439 ufs_put_locked_page(lastpage);
440out:
441 return err;
442}
443
444int ufs_truncate(struct inode *inode, loff_t old_i_size)
445{
446 struct ufs_inode_info *ufsi = UFS_I(inode);
447 struct super_block *sb = inode->i_sb;
448 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
449 int retry, err = 0;
450
451 UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
452 inode->i_ino, (unsigned long long)i_size_read(inode),
453 (unsigned long long)old_i_size);
454
455 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
456 S_ISLNK(inode->i_mode)))
457 return -EINVAL;
458 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
459 return -EPERM;
460
461 err = ufs_alloc_lastblock(inode);
462
463 if (err) {
464 i_size_write(inode, old_i_size);
465 goto out;
466 }
467
468 block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
469
470 lock_kernel();
471 while (1) {
472 retry = ufs_trunc_direct(inode);
473 retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
474 ufs_get_direct_data_ptr(uspi, ufsi,
475 UFS_IND_BLOCK));
476 retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
477 ufs_get_direct_data_ptr(uspi, ufsi,
478 UFS_DIND_BLOCK));
479 retry |= ufs_trunc_tindirect (inode);
480 if (!retry)
481 break;
482 if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
483 ufs_sync_inode (inode);
484 blk_run_address_space(inode->i_mapping);
485 yield();
486 }
487
488 inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
489 ufsi->i_lastfrag = DIRECT_FRAGMENT;
490 unlock_kernel();
491 mark_inode_dirty(inode);
492out:
493 UFSD("EXIT: err %d\n", err);
494 return err;
495}
496
497int ufs_setattr(struct dentry *dentry, struct iattr *attr)
498{
499 struct inode *inode = dentry->d_inode;
500 unsigned int ia_valid = attr->ia_valid;
501 int error;
502
503 error = inode_change_ok(inode, attr);
504 if (error)
505 return error;
506
507 if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
508 loff_t old_i_size = inode->i_size;
509
510
511 truncate_setsize(inode, attr->ia_size);
512
513 error = ufs_truncate(inode, old_i_size);
514 if (error)
515 return error;
516 }
517
518 setattr_copy(inode, attr);
519 mark_inode_dirty(inode);
520 return 0;
521}
522
523const struct inode_operations ufs_file_inode_operations = {
524 .setattr = ufs_setattr,
525};
526
