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>
54 * Secure deletion currently doesn't work. It interacts very badly
55 * with buffers shared with memory mappings, and for that reason
56 * can't be done in the truncate() routines. It should instead be
57 * done separately in "release()" before calling the truncate routines
58 * that will release the actual file blocks.
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)
67 static int ufs_trunc_direct(struct inode *inode)
69 struct ufs_inode_info *ufsi = UFS_I(inode);
70 struct super_block * sb;
71 struct ufs_sb_private_info * uspi;
73 u64 frag1, frag2, frag3, frag4, block1, block2;
74 unsigned frag_to_free, free_count;
78 UFSD("ENTER: ino %lu\n", inode->i_ino);
81 uspi = UFS_SB(sb)->s_uspi;
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;
95 } else if (frag2 < frag3) {
96 block1 = ufs_fragstoblks (frag2);
97 block2 = ufs_fragstoblks (frag3);
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);
110 * Free first free fragments
112 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
113 tmp = ufs_data_ptr_to_cpu(sb, p);
115 ufs_panic (sb, "ufs_trunc_direct", "internal error");
117 frag1 = ufs_fragnum (frag1);
119 ufs_free_fragments(inode, tmp + frag1, frag2);
120 mark_inode_dirty(inode);
121 frag_to_free = tmp + frag1;
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);
132 ufs_data_ptr_clear(uspi, p);
134 if (free_count == 0) {
136 free_count = uspi->s_fpb;
137 } else if (free_count > 0 && frag_to_free == tmp - free_count)
138 free_count += uspi->s_fpb;
140 ufs_free_blocks (inode, frag_to_free, free_count);
142 free_count = uspi->s_fpb;
144 mark_inode_dirty(inode);
148 ufs_free_blocks (inode, frag_to_free, free_count);
154 * Free last free fragments
156 p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
157 tmp = ufs_data_ptr_to_cpu(sb, p);
159 ufs_panic(sb, "ufs_truncate_direct", "internal error");
160 frag4 = ufs_fragnum (frag4);
161 ufs_data_ptr_clear(uspi, p);
163 ufs_free_fragments (inode, tmp, frag4);
164 mark_inode_dirty(inode);
167 UFSD("EXIT: ino %lu\n", inode->i_ino);
172 static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
174 struct super_block * sb;
175 struct ufs_sb_private_info * uspi;
176 struct ufs_buffer_head * ind_ubh;
178 u64 tmp, indirect_block, i, frag_to_free;
182 UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
183 inode->i_ino, (unsigned long long)offset, p);
188 uspi = UFS_SB(sb)->s_uspi;
194 tmp = ufs_data_ptr_to_cpu(sb, p);
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);
203 ufs_data_ptr_clear(uspi, p);
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);
214 ufs_data_ptr_clear(uspi, ind);
215 ubh_mark_buffer_dirty(ind_ubh);
216 if (free_count == 0) {
218 free_count = uspi->s_fpb;
219 } else if (free_count > 0 && frag_to_free == tmp - free_count)
220 free_count += uspi->s_fpb;
222 ufs_free_blocks (inode, frag_to_free, free_count);
224 free_count = uspi->s_fpb;
227 mark_inode_dirty(inode);
230 if (free_count > 0) {
231 ufs_free_blocks (inode, frag_to_free, free_count);
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)))
237 if (i >= uspi->s_apb) {
238 tmp = ufs_data_ptr_to_cpu(sb, p);
239 ufs_data_ptr_clear(uspi, p);
241 ufs_free_blocks (inode, tmp, uspi->s_fpb);
242 mark_inode_dirty(inode);
243 ubh_bforget(ind_ubh);
246 if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
247 ubh_sync_block(ind_ubh);
248 ubh_brelse (ind_ubh);
250 UFSD("EXIT: ino %lu\n", inode->i_ino);
255 static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
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;
264 UFSD("ENTER: ino %lu\n", inode->i_ino);
267 uspi = UFS_SB(sb)->s_uspi;
269 dindirect_block = (DIRECT_BLOCK > offset)
270 ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
273 tmp = ufs_data_ptr_to_cpu(sb, p);
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);
282 ufs_data_ptr_clear(uspi, p);
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);
291 retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
292 ubh_mark_buffer_dirty(dind_bh);
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)))
299 if (i >= uspi->s_apb) {
300 tmp = ufs_data_ptr_to_cpu(sb, p);
301 ufs_data_ptr_clear(uspi, p);
303 ufs_free_blocks(inode, tmp, uspi->s_fpb);
304 mark_inode_dirty(inode);
305 ubh_bforget(dind_bh);
308 if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
309 ubh_sync_block(dind_bh);
310 ubh_brelse (dind_bh);
312 UFSD("EXIT: ino %lu\n", inode->i_ino);
317 static int ufs_trunc_tindirect(struct inode *inode)
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;
327 UFSD("ENTER: ino %lu\n", inode->i_ino);
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;
334 p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
335 if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
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);
343 ufs_data_ptr_clear(uspi, p);
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);
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)))
357 if (i >= uspi->s_apb) {
358 tmp = ufs_data_ptr_to_cpu(sb, p);
359 ufs_data_ptr_clear(uspi, p);
361 ufs_free_blocks(inode, tmp, uspi->s_fpb);
362 mark_inode_dirty(inode);
363 ubh_bforget(tind_bh);
366 if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
367 ubh_sync_block(tind_bh);
368 ubh_brelse (tind_bh);
370 UFSD("EXIT: ino %lu\n", inode->i_ino);
374 static int ufs_alloc_lastblock(struct inode *inode)
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;
382 struct page *lastpage;
383 struct buffer_head *bh;
386 lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
393 lastpage = ufs_get_locked_page(mapping, lastfrag >>
394 (PAGE_CACHE_SHIFT - inode->i_blkbits));
395 if (IS_ERR(lastpage)) {
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;
406 err = ufs_getfrag_block(inode, lastfrag, bh, 1);
411 if (buffer_new(bh)) {
412 clear_buffer_new(bh);
413 unmap_underlying_metadata(bh->b_bdev,
416 * we do not zeroize fragment, because of
417 * if it maped to hole, it already contains zeroes
419 set_buffer_uptodate(bh);
420 mark_buffer_dirty(bh);
421 set_page_dirty(lastpage);
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);
430 memset(bh->b_data, 0, sb->s_blocksize);
431 set_buffer_uptodate(bh);
432 mark_buffer_dirty(bh);
434 sync_dirty_buffer(bh);
439 ufs_put_locked_page(lastpage);
444 int ufs_truncate(struct inode *inode, loff_t old_i_size)
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;
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);
455 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
456 S_ISLNK(inode->i_mode)))
458 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
461 err = ufs_alloc_lastblock(inode);
464 i_size_write(inode, old_i_size);
468 block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
472 retry = ufs_trunc_direct(inode);
473 retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
474 ufs_get_direct_data_ptr(uspi, ufsi,
476 retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
477 ufs_get_direct_data_ptr(uspi, ufsi,
479 retry |= ufs_trunc_tindirect (inode);
482 if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
483 ufs_sync_inode (inode);
484 blk_run_address_space(inode->i_mapping);
488 inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
489 ufsi->i_lastfrag = DIRECT_FRAGMENT;
491 mark_inode_dirty(inode);
493 UFSD("EXIT: err %d\n", err);
497 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
499 struct inode *inode = dentry->d_inode;
500 unsigned int ia_valid = attr->ia_valid;
503 error = inode_change_ok(inode, attr);
507 if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
508 loff_t old_i_size = inode->i_size;
510 /* XXX(truncate): truncate_setsize should be called last */
511 truncate_setsize(inode, attr->ia_size);
513 error = ufs_truncate(inode, old_i_size);
518 setattr_copy(inode, attr);
519 mark_inode_dirty(inode);
523 const struct inode_operations ufs_file_inode_operations = {
524 .setattr = ufs_setattr,