2 * linux/fs/ufs/truncate.c
5 * Daniel Pirkl <daniel.pirkl@email.cz>
6 * Charles University, Faculty of Mathematics and Physics
10 * linux/fs/ext2/truncate.c
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)
19 * linux/fs/minix/truncate.c
21 * Copyright (C) 1991, 1992 Linus Torvalds
23 * Big-endian to little-endian byte-swapping/bitmaps by
24 * David S. Miller (davem@caip.rutgers.edu), 1995
28 * Real random numbers for secure rm added 94/02/18
29 * Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
33 * Adoptation to use page cache and UFS2 write support by
34 * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
37 #include <linux/errno.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 #include <linux/quotaops.h>
55 * Secure deletion currently doesn't work. It interacts very badly
56 * with buffers shared with memory mappings, and for that reason
57 * can't be done in the truncate() routines. It should instead be
58 * done separately in "release()" before calling the truncate routines
59 * that will release the actual file blocks.
64 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
65 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
68 static int ufs_trunc_direct(struct inode *inode)
70 struct ufs_inode_info *ufsi = UFS_I(inode);
71 struct super_block * sb;
72 struct ufs_sb_private_info * uspi;
74 u64 frag1, frag2, frag3, frag4, block1, block2;
75 unsigned frag_to_free, free_count;
79 UFSD("ENTER: ino %lu\n", inode->i_ino);
82 uspi = UFS_SB(sb)->s_uspi;
88 frag1 = DIRECT_FRAGMENT;
89 frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
90 frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
91 frag3 = frag4 & ~uspi->s_fpbmask;
96 } else if (frag2 < frag3) {
97 block1 = ufs_fragstoblks (frag2);
98 block2 = ufs_fragstoblks (frag3);
101 UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
102 " frag3 %llu, frag4 %llu\n", inode->i_ino,
103 (unsigned long long)frag1, (unsigned long long)frag2,
104 (unsigned long long)block1, (unsigned long long)block2,
105 (unsigned long long)frag3, (unsigned long long)frag4);
111 * Free first free fragments
113 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
114 tmp = ufs_data_ptr_to_cpu(sb, p);
116 ufs_panic (sb, "ufs_trunc_direct", "internal error");
118 frag1 = ufs_fragnum (frag1);
120 ufs_free_fragments(inode, tmp + frag1, frag2);
121 mark_inode_dirty(inode);
122 frag_to_free = tmp + frag1;
128 for (i = block1 ; i < block2; i++) {
129 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
130 tmp = ufs_data_ptr_to_cpu(sb, p);
133 ufs_data_ptr_clear(uspi, p);
135 if (free_count == 0) {
137 free_count = uspi->s_fpb;
138 } else if (free_count > 0 && frag_to_free == tmp - free_count)
139 free_count += uspi->s_fpb;
141 ufs_free_blocks (inode, frag_to_free, free_count);
143 free_count = uspi->s_fpb;
145 mark_inode_dirty(inode);
149 ufs_free_blocks (inode, frag_to_free, free_count);
155 * Free last free fragments
157 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
158 tmp = ufs_data_ptr_to_cpu(sb, p);
160 ufs_panic(sb, "ufs_truncate_direct", "internal error");
161 frag4 = ufs_fragnum (frag4);
162 ufs_data_ptr_clear(uspi, p);
164 ufs_free_fragments (inode, tmp, frag4);
165 mark_inode_dirty(inode);
168 UFSD("EXIT: ino %lu\n", inode->i_ino);
173 static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
175 struct super_block * sb;
176 struct ufs_sb_private_info * uspi;
177 struct ufs_buffer_head * ind_ubh;
179 u64 tmp, indirect_block, i, frag_to_free;
183 UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
184 inode->i_ino, (unsigned long long)offset, p);
189 uspi = UFS_SB(sb)->s_uspi;
195 tmp = ufs_data_ptr_to_cpu(sb, p);
198 ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
199 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
200 ubh_brelse (ind_ubh);
204 ufs_data_ptr_clear(uspi, p);
208 indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
209 for (i = indirect_block; i < uspi->s_apb; i++) {
210 ind = ubh_get_data_ptr(uspi, ind_ubh, i);
211 tmp = ufs_data_ptr_to_cpu(sb, ind);
215 ufs_data_ptr_clear(uspi, ind);
216 ubh_mark_buffer_dirty(ind_ubh);
217 if (free_count == 0) {
219 free_count = uspi->s_fpb;
220 } else if (free_count > 0 && frag_to_free == tmp - free_count)
221 free_count += uspi->s_fpb;
223 ufs_free_blocks (inode, frag_to_free, free_count);
225 free_count = uspi->s_fpb;
228 mark_inode_dirty(inode);
231 if (free_count > 0) {
232 ufs_free_blocks (inode, frag_to_free, free_count);
234 for (i = 0; i < uspi->s_apb; i++)
235 if (!ufs_is_data_ptr_zero(uspi,
236 ubh_get_data_ptr(uspi, ind_ubh, i)))
238 if (i >= uspi->s_apb) {
239 tmp = ufs_data_ptr_to_cpu(sb, p);
240 ufs_data_ptr_clear(uspi, p);
242 ufs_free_blocks (inode, tmp, uspi->s_fpb);
243 mark_inode_dirty(inode);
244 ubh_bforget(ind_ubh);
247 if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
248 ubh_ll_rw_block(SWRITE, ind_ubh);
249 ubh_wait_on_buffer (ind_ubh);
251 ubh_brelse (ind_ubh);
253 UFSD("EXIT: ino %lu\n", inode->i_ino);
258 static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
260 struct super_block * sb;
261 struct ufs_sb_private_info * uspi;
262 struct ufs_buffer_head *dind_bh;
263 u64 i, tmp, dindirect_block;
267 UFSD("ENTER: ino %lu\n", inode->i_ino);
270 uspi = UFS_SB(sb)->s_uspi;
272 dindirect_block = (DIRECT_BLOCK > offset)
273 ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
276 tmp = ufs_data_ptr_to_cpu(sb, p);
279 dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
280 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
281 ubh_brelse (dind_bh);
285 ufs_data_ptr_clear(uspi, p);
289 for (i = dindirect_block ; i < uspi->s_apb ; i++) {
290 dind = ubh_get_data_ptr(uspi, dind_bh, i);
291 tmp = ufs_data_ptr_to_cpu(sb, dind);
294 retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
295 ubh_mark_buffer_dirty(dind_bh);
298 for (i = 0; i < uspi->s_apb; i++)
299 if (!ufs_is_data_ptr_zero(uspi,
300 ubh_get_data_ptr(uspi, dind_bh, i)))
302 if (i >= uspi->s_apb) {
303 tmp = ufs_data_ptr_to_cpu(sb, p);
304 ufs_data_ptr_clear(uspi, p);
306 ufs_free_blocks(inode, tmp, uspi->s_fpb);
307 mark_inode_dirty(inode);
308 ubh_bforget(dind_bh);
311 if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
312 ubh_ll_rw_block(SWRITE, dind_bh);
313 ubh_wait_on_buffer (dind_bh);
315 ubh_brelse (dind_bh);
317 UFSD("EXIT: ino %lu\n", inode->i_ino);
322 static int ufs_trunc_tindirect(struct inode *inode)
324 struct super_block *sb = inode->i_sb;
325 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
326 struct ufs_inode_info *ufsi = UFS_I(inode);
327 struct ufs_buffer_head * tind_bh;
328 u64 tindirect_block, tmp, i;
332 UFSD("ENTER: ino %lu\n", inode->i_ino);
336 tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
337 ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
339 p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
340 if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
342 tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
343 if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
344 ubh_brelse (tind_bh);
348 ufs_data_ptr_clear(uspi, p);
352 for (i = tindirect_block ; i < uspi->s_apb ; i++) {
353 tind = ubh_get_data_ptr(uspi, tind_bh, i);
354 retry |= ufs_trunc_dindirect(inode, UFS_NDADDR +
355 uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
356 ubh_mark_buffer_dirty(tind_bh);
358 for (i = 0; i < uspi->s_apb; i++)
359 if (!ufs_is_data_ptr_zero(uspi,
360 ubh_get_data_ptr(uspi, tind_bh, i)))
362 if (i >= uspi->s_apb) {
363 tmp = ufs_data_ptr_to_cpu(sb, p);
364 ufs_data_ptr_clear(uspi, p);
366 ufs_free_blocks(inode, tmp, uspi->s_fpb);
367 mark_inode_dirty(inode);
368 ubh_bforget(tind_bh);
371 if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
372 ubh_ll_rw_block(SWRITE, tind_bh);
373 ubh_wait_on_buffer (tind_bh);
375 ubh_brelse (tind_bh);
377 UFSD("EXIT: ino %lu\n", inode->i_ino);
381 static int ufs_alloc_lastblock(struct inode *inode)
384 struct super_block *sb = inode->i_sb;
385 struct address_space *mapping = inode->i_mapping;
386 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
389 struct page *lastpage;
390 struct buffer_head *bh;
393 lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
400 lastpage = ufs_get_locked_page(mapping, lastfrag >>
401 (PAGE_CACHE_SHIFT - inode->i_blkbits));
402 if (IS_ERR(lastpage)) {
407 end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
408 bh = page_buffers(lastpage);
409 for (i = 0; i < end; ++i)
410 bh = bh->b_this_page;
413 err = ufs_getfrag_block(inode, lastfrag, bh, 1);
418 if (buffer_new(bh)) {
419 clear_buffer_new(bh);
420 unmap_underlying_metadata(bh->b_bdev,
423 * we do not zeroize fragment, because of
424 * if it maped to hole, it already contains zeroes
426 set_buffer_uptodate(bh);
427 mark_buffer_dirty(bh);
428 set_page_dirty(lastpage);
431 if (lastfrag >= UFS_IND_FRAGMENT) {
432 end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
433 phys64 = bh->b_blocknr + 1;
434 for (i = 0; i < end; ++i) {
435 bh = sb_getblk(sb, i + phys64);
437 memset(bh->b_data, 0, sb->s_blocksize);
438 set_buffer_uptodate(bh);
439 mark_buffer_dirty(bh);
441 sync_dirty_buffer(bh);
446 ufs_put_locked_page(lastpage);
451 int ufs_truncate(struct inode *inode, loff_t old_i_size)
453 struct ufs_inode_info *ufsi = UFS_I(inode);
454 struct super_block *sb = inode->i_sb;
455 struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
458 UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
459 inode->i_ino, (unsigned long long)i_size_read(inode),
460 (unsigned long long)old_i_size);
462 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
463 S_ISLNK(inode->i_mode)))
465 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
468 err = ufs_alloc_lastblock(inode);
471 i_size_write(inode, old_i_size);
475 block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
479 retry = ufs_trunc_direct(inode);
480 retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
481 ufs_get_direct_data_ptr(uspi, ufsi,
483 retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
484 ufs_get_direct_data_ptr(uspi, ufsi,
486 retry |= ufs_trunc_tindirect (inode);
489 if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
490 ufs_sync_inode (inode);
491 blk_run_address_space(inode->i_mapping);
495 inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
496 ufsi->i_lastfrag = DIRECT_FRAGMENT;
498 mark_inode_dirty(inode);
500 UFSD("EXIT: err %d\n", err);
506 * We don't define our `inode->i_op->truncate', and call it here,
508 * - there is no way to know old size
509 * - there is no way inform user about error, if it happens in `truncate'
511 static int ufs_setattr(struct dentry *dentry, struct iattr *attr)
513 struct inode *inode = dentry->d_inode;
514 unsigned int ia_valid = attr->ia_valid;
517 error = inode_change_ok(inode, attr);
521 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
522 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
523 error = dquot_transfer(inode, attr);
527 if (ia_valid & ATTR_SIZE &&
528 attr->ia_size != i_size_read(inode)) {
529 loff_t old_i_size = inode->i_size;
531 dquot_initialize(inode);
533 error = vmtruncate(inode, attr->ia_size);
536 error = ufs_truncate(inode, old_i_size);
540 return inode_setattr(inode, attr);
543 const struct inode_operations ufs_file_inode_operations = {
544 .setattr = ufs_setattr,