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Linux/fs/ufs/truncate.c

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  1 /*
  2  *  linux/fs/ufs/truncate.c
  3  *
  4  * Copyright (C) 1998
  5  * Daniel Pirkl <daniel.pirkl@email.cz>
  6  * Charles University, Faculty of Mathematics and Physics
  7  *
  8  *  from
  9  *
 10  *  linux/fs/ext2/truncate.c
 11  *
 12  * Copyright (C) 1992, 1993, 1994, 1995
 13  * Remy Card (card@masi.ibp.fr)
 14  * Laboratoire MASI - Institut Blaise Pascal
 15  * Universite Pierre et Marie Curie (Paris VI)
 16  *
 17  *  from
 18  *
 19  *  linux/fs/minix/truncate.c
 20  *
 21  *  Copyright (C) 1991, 1992  Linus Torvalds
 22  *
 23  *  Big-endian to little-endian byte-swapping/bitmaps by
 24  *        David S. Miller (davem@caip.rutgers.edu), 1995
 25  */
 26 
 27 /*
 28  * Real random numbers for secure rm added 94/02/18
 29  * Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
 30  */
 31 
 32 /*
 33  * Adoptation to use page cache and UFS2 write support by
 34  * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
 35  */
 36 
 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/buffer_head.h>
 44 #include <linux/blkdev.h>
 45 #include <linux/sched.h>
 46 
 47 #include "ufs_fs.h"
 48 #include "ufs.h"
 49 #include "swab.h"
 50 #include "util.h"
 51 
 52 /*
 53  * Secure deletion currently doesn't work. It interacts very badly
 54  * with buffers shared with memory mappings, and for that reason
 55  * can't be done in the truncate() routines. It should instead be
 56  * done separately in "release()" before calling the truncate routines
 57  * that will release the actual file blocks.
 58  *
 59  *              Linus
 60  */
 61 
 62 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 63 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 64 
 65 
 66 static int ufs_trunc_direct(struct inode *inode)
 67 {
 68         struct ufs_inode_info *ufsi = UFS_I(inode);
 69         struct super_block * sb;
 70         struct ufs_sb_private_info * uspi;
 71         void *p;
 72         u64 frag1, frag2, frag3, frag4, block1, block2;
 73         unsigned frag_to_free, free_count;
 74         unsigned i, tmp;
 75         int retry;
 76         
 77         UFSD("ENTER: ino %lu\n", inode->i_ino);
 78 
 79         sb = inode->i_sb;
 80         uspi = UFS_SB(sb)->s_uspi;
 81         
 82         frag_to_free = 0;
 83         free_count = 0;
 84         retry = 0;
 85         
 86         frag1 = DIRECT_FRAGMENT;
 87         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 88         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 89         frag3 = frag4 & ~uspi->s_fpbmask;
 90         block1 = block2 = 0;
 91         if (frag2 > frag3) {
 92                 frag2 = frag4;
 93                 frag3 = frag4 = 0;
 94         } else if (frag2 < frag3) {
 95                 block1 = ufs_fragstoblks (frag2);
 96                 block2 = ufs_fragstoblks (frag3);
 97         }
 98 
 99         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
100              " frag3 %llu, frag4 %llu\n", inode->i_ino,
101              (unsigned long long)frag1, (unsigned long long)frag2,
102              (unsigned long long)block1, (unsigned long long)block2,
103              (unsigned long long)frag3, (unsigned long long)frag4);
104 
105         if (frag1 >= frag2)
106                 goto next1;             
107 
108         /*
109          * Free first free fragments
110          */
111         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
112         tmp = ufs_data_ptr_to_cpu(sb, p);
113         if (!tmp )
114                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
115         frag2 -= frag1;
116         frag1 = ufs_fragnum (frag1);
117 
118         ufs_free_fragments(inode, tmp + frag1, frag2);
119         mark_inode_dirty(inode);
120         frag_to_free = tmp + frag1;
121 
122 next1:
123         /*
124          * Free whole blocks
125          */
126         for (i = block1 ; i < block2; i++) {
127                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
128                 tmp = ufs_data_ptr_to_cpu(sb, p);
129                 if (!tmp)
130                         continue;
131                 ufs_data_ptr_clear(uspi, p);
132 
133                 if (free_count == 0) {
134                         frag_to_free = tmp;
135                         free_count = uspi->s_fpb;
136                 } else if (free_count > 0 && frag_to_free == tmp - free_count)
137                         free_count += uspi->s_fpb;
138                 else {
139                         ufs_free_blocks (inode, frag_to_free, free_count);
140                         frag_to_free = tmp;
141                         free_count = uspi->s_fpb;
142                 }
143                 mark_inode_dirty(inode);
144         }
145         
146         if (free_count > 0)
147                 ufs_free_blocks (inode, frag_to_free, free_count);
148 
149         if (frag3 >= frag4)
150                 goto next3;
151 
152         /*
153          * Free last free fragments
154          */
155         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
156         tmp = ufs_data_ptr_to_cpu(sb, p);
157         if (!tmp )
158                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
159         frag4 = ufs_fragnum (frag4);
160         ufs_data_ptr_clear(uspi, p);
161 
162         ufs_free_fragments (inode, tmp, frag4);
163         mark_inode_dirty(inode);
164  next3:
165 
166         UFSD("EXIT: ino %lu\n", inode->i_ino);
167         return retry;
168 }
169 
170 
171 static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
172 {
173         struct super_block * sb;
174         struct ufs_sb_private_info * uspi;
175         struct ufs_buffer_head * ind_ubh;
176         void *ind;
177         u64 tmp, indirect_block, i, frag_to_free;
178         unsigned free_count;
179         int retry;
180 
181         UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
182              inode->i_ino, (unsigned long long)offset, p);
183 
184         BUG_ON(!p);
185                 
186         sb = inode->i_sb;
187         uspi = UFS_SB(sb)->s_uspi;
188 
189         frag_to_free = 0;
190         free_count = 0;
191         retry = 0;
192         
193         tmp = ufs_data_ptr_to_cpu(sb, p);
194         if (!tmp)
195                 return 0;
196         ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
197         if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
198                 ubh_brelse (ind_ubh);
199                 return 1;
200         }
201         if (!ind_ubh) {
202                 ufs_data_ptr_clear(uspi, p);
203                 return 0;
204         }
205 
206         indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
207         for (i = indirect_block; i < uspi->s_apb; i++) {
208                 ind = ubh_get_data_ptr(uspi, ind_ubh, i);
209                 tmp = ufs_data_ptr_to_cpu(sb, ind);
210                 if (!tmp)
211                         continue;
212 
213                 ufs_data_ptr_clear(uspi, ind);
214                 ubh_mark_buffer_dirty(ind_ubh);
215                 if (free_count == 0) {
216                         frag_to_free = tmp;
217                         free_count = uspi->s_fpb;
218                 } else if (free_count > 0 && frag_to_free == tmp - free_count)
219                         free_count += uspi->s_fpb;
220                 else {
221                         ufs_free_blocks (inode, frag_to_free, free_count);
222                         frag_to_free = tmp;
223                         free_count = uspi->s_fpb;
224                 }
225 
226                 mark_inode_dirty(inode);
227         }
228 
229         if (free_count > 0) {
230                 ufs_free_blocks (inode, frag_to_free, free_count);
231         }
232         for (i = 0; i < uspi->s_apb; i++)
233                 if (!ufs_is_data_ptr_zero(uspi,
234                                           ubh_get_data_ptr(uspi, ind_ubh, i)))
235                         break;
236         if (i >= uspi->s_apb) {
237                 tmp = ufs_data_ptr_to_cpu(sb, p);
238                 ufs_data_ptr_clear(uspi, p);
239 
240                 ufs_free_blocks (inode, tmp, uspi->s_fpb);
241                 mark_inode_dirty(inode);
242                 ubh_bforget(ind_ubh);
243                 ind_ubh = NULL;
244         }
245         if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
246                 ubh_sync_block(ind_ubh);
247         ubh_brelse (ind_ubh);
248         
249         UFSD("EXIT: ino %lu\n", inode->i_ino);
250         
251         return retry;
252 }
253 
254 static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
255 {
256         struct super_block * sb;
257         struct ufs_sb_private_info * uspi;
258         struct ufs_buffer_head *dind_bh;
259         u64 i, tmp, dindirect_block;
260         void *dind;
261         int retry = 0;
262         
263         UFSD("ENTER: ino %lu\n", inode->i_ino);
264         
265         sb = inode->i_sb;
266         uspi = UFS_SB(sb)->s_uspi;
267 
268         dindirect_block = (DIRECT_BLOCK > offset) 
269                 ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
270         retry = 0;
271         
272         tmp = ufs_data_ptr_to_cpu(sb, p);
273         if (!tmp)
274                 return 0;
275         dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
276         if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
277                 ubh_brelse (dind_bh);
278                 return 1;
279         }
280         if (!dind_bh) {
281                 ufs_data_ptr_clear(uspi, p);
282                 return 0;
283         }
284 
285         for (i = dindirect_block ; i < uspi->s_apb ; i++) {
286                 dind = ubh_get_data_ptr(uspi, dind_bh, i);
287                 tmp = ufs_data_ptr_to_cpu(sb, dind);
288                 if (!tmp)
289                         continue;
290                 retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
291                 ubh_mark_buffer_dirty(dind_bh);
292         }
293 
294         for (i = 0; i < uspi->s_apb; i++)
295                 if (!ufs_is_data_ptr_zero(uspi,
296                                           ubh_get_data_ptr(uspi, dind_bh, i)))
297                         break;
298         if (i >= uspi->s_apb) {
299                 tmp = ufs_data_ptr_to_cpu(sb, p);
300                 ufs_data_ptr_clear(uspi, p);
301 
302                 ufs_free_blocks(inode, tmp, uspi->s_fpb);
303                 mark_inode_dirty(inode);
304                 ubh_bforget(dind_bh);
305                 dind_bh = NULL;
306         }
307         if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
308                 ubh_sync_block(dind_bh);
309         ubh_brelse (dind_bh);
310         
311         UFSD("EXIT: ino %lu\n", inode->i_ino);
312         
313         return retry;
314 }
315 
316 static int ufs_trunc_tindirect(struct inode *inode)
317 {
318         struct super_block *sb = inode->i_sb;
319         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
320         struct ufs_inode_info *ufsi = UFS_I(inode);
321         struct ufs_buffer_head * tind_bh;
322         u64 tindirect_block, tmp, i;
323         void *tind, *p;
324         int retry;
325         
326         UFSD("ENTER: ino %lu\n", inode->i_ino);
327 
328         retry = 0;
329         
330         tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
331                 ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
332 
333         p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
334         if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
335                 return 0;
336         tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
337         if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
338                 ubh_brelse (tind_bh);
339                 return 1;
340         }
341         if (!tind_bh) {
342                 ufs_data_ptr_clear(uspi, p);
343                 return 0;
344         }
345 
346         for (i = tindirect_block ; i < uspi->s_apb ; i++) {
347                 tind = ubh_get_data_ptr(uspi, tind_bh, i);
348                 retry |= ufs_trunc_dindirect(inode, UFS_NDADDR + 
349                         uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
350                 ubh_mark_buffer_dirty(tind_bh);
351         }
352         for (i = 0; i < uspi->s_apb; i++)
353                 if (!ufs_is_data_ptr_zero(uspi,
354                                           ubh_get_data_ptr(uspi, tind_bh, i)))
355                         break;
356         if (i >= uspi->s_apb) {
357                 tmp = ufs_data_ptr_to_cpu(sb, p);
358                 ufs_data_ptr_clear(uspi, p);
359 
360                 ufs_free_blocks(inode, tmp, uspi->s_fpb);
361                 mark_inode_dirty(inode);
362                 ubh_bforget(tind_bh);
363                 tind_bh = NULL;
364         }
365         if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
366                 ubh_sync_block(tind_bh);
367         ubh_brelse (tind_bh);
368         
369         UFSD("EXIT: ino %lu\n", inode->i_ino);
370         return retry;
371 }
372 
373 static int ufs_alloc_lastblock(struct inode *inode)
374 {
375         int err = 0;
376         struct super_block *sb = inode->i_sb;
377         struct address_space *mapping = inode->i_mapping;
378         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
379         unsigned i, end;
380         sector_t lastfrag;
381         struct page *lastpage;
382         struct buffer_head *bh;
383         u64 phys64;
384 
385         lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
386 
387         if (!lastfrag)
388                 goto out;
389 
390         lastfrag--;
391 
392         lastpage = ufs_get_locked_page(mapping, lastfrag >>
393                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
394        if (IS_ERR(lastpage)) {
395                err = -EIO;
396                goto out;
397        }
398 
399        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
400        bh = page_buffers(lastpage);
401        for (i = 0; i < end; ++i)
402                bh = bh->b_this_page;
403 
404 
405        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
406 
407        if (unlikely(err))
408                goto out_unlock;
409 
410        if (buffer_new(bh)) {
411                clear_buffer_new(bh);
412                unmap_underlying_metadata(bh->b_bdev,
413                                          bh->b_blocknr);
414                /*
415                 * we do not zeroize fragment, because of
416                 * if it maped to hole, it already contains zeroes
417                 */
418                set_buffer_uptodate(bh);
419                mark_buffer_dirty(bh);
420                set_page_dirty(lastpage);
421        }
422 
423        if (lastfrag >= UFS_IND_FRAGMENT) {
424                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
425                phys64 = bh->b_blocknr + 1;
426                for (i = 0; i < end; ++i) {
427                        bh = sb_getblk(sb, i + phys64);
428                        lock_buffer(bh);
429                        memset(bh->b_data, 0, sb->s_blocksize);
430                        set_buffer_uptodate(bh);
431                        mark_buffer_dirty(bh);
432                        unlock_buffer(bh);
433                        sync_dirty_buffer(bh);
434                        brelse(bh);
435                }
436        }
437 out_unlock:
438        ufs_put_locked_page(lastpage);
439 out:
440        return err;
441 }
442 
443 int ufs_truncate(struct inode *inode, loff_t old_i_size)
444 {
445         struct ufs_inode_info *ufsi = UFS_I(inode);
446         struct super_block *sb = inode->i_sb;
447         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
448         int retry, err = 0;
449         
450         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
451              inode->i_ino, (unsigned long long)i_size_read(inode),
452              (unsigned long long)old_i_size);
453 
454         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
455               S_ISLNK(inode->i_mode)))
456                 return -EINVAL;
457         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
458                 return -EPERM;
459 
460         err = ufs_alloc_lastblock(inode);
461 
462         if (err) {
463                 i_size_write(inode, old_i_size);
464                 goto out;
465         }
466 
467         block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
468 
469         while (1) {
470                 retry = ufs_trunc_direct(inode);
471                 retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
472                                             ufs_get_direct_data_ptr(uspi, ufsi,
473                                                                     UFS_IND_BLOCK));
474                 retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
475                                              ufs_get_direct_data_ptr(uspi, ufsi,
476                                                                      UFS_DIND_BLOCK));
477                 retry |= ufs_trunc_tindirect (inode);
478                 if (!retry)
479                         break;
480                 if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
481                         ufs_sync_inode (inode);
482                 yield();
483         }
484 
485         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
486         ufsi->i_lastfrag = DIRECT_FRAGMENT;
487         mark_inode_dirty(inode);
488 out:
489         UFSD("EXIT: err %d\n", err);
490         return err;
491 }
492 
493 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
494 {
495         struct inode *inode = dentry->d_inode;
496         unsigned int ia_valid = attr->ia_valid;
497         int error;
498 
499         error = inode_change_ok(inode, attr);
500         if (error)
501                 return error;
502 
503         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
504                 loff_t old_i_size = inode->i_size;
505 
506                 /* XXX(truncate): truncate_setsize should be called last */
507                 truncate_setsize(inode, attr->ia_size);
508 
509                 lock_ufs(inode->i_sb);
510                 error = ufs_truncate(inode, old_i_size);
511                 unlock_ufs(inode->i_sb);
512                 if (error)
513                         return error;
514         }
515 
516         setattr_copy(inode, attr);
517         mark_inode_dirty(inode);
518         return 0;
519 }
520 
521 const struct inode_operations ufs_file_inode_operations = {
522         .setattr = ufs_setattr,
523 };
524 

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