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/buffer_head.h>
44
#include <linux/blkdev.h>
45
#include <linux/sched.h>
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.
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)
66
static int ufs_trunc_direct(struct inode *inode)
68
struct ufs_inode_info *ufsi = UFS_I(inode);
69
struct super_block * sb;
70
struct ufs_sb_private_info * uspi;
72
u64 frag1, frag2, frag3, frag4, block1, block2;
73
unsigned frag_to_free, free_count;
77
UFSD("ENTER: ino %lu\n", inode->i_ino);
80
uspi = UFS_SB(sb)->s_uspi;
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;
94
} else if (frag2 < frag3) {
95
block1 = ufs_fragstoblks (frag2);
96
block2 = ufs_fragstoblks (frag3);
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);
109
* Free first free fragments
111
p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
112
tmp = ufs_data_ptr_to_cpu(sb, p);
114
ufs_panic (sb, "ufs_trunc_direct", "internal error");
116
frag1 = ufs_fragnum (frag1);
118
ufs_free_fragments(inode, tmp + frag1, frag2);
119
mark_inode_dirty(inode);
120
frag_to_free = tmp + frag1;
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);
131
ufs_data_ptr_clear(uspi, p);
133
if (free_count == 0) {
135
free_count = uspi->s_fpb;
136
} else if (free_count > 0 && frag_to_free == tmp - free_count)
137
free_count += uspi->s_fpb;
139
ufs_free_blocks (inode, frag_to_free, free_count);
141
free_count = uspi->s_fpb;
143
mark_inode_dirty(inode);
147
ufs_free_blocks (inode, frag_to_free, free_count);
153
* Free last free fragments
155
p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
156
tmp = ufs_data_ptr_to_cpu(sb, p);
158
ufs_panic(sb, "ufs_truncate_direct", "internal error");
159
frag4 = ufs_fragnum (frag4);
160
ufs_data_ptr_clear(uspi, p);
162
ufs_free_fragments (inode, tmp, frag4);
163
mark_inode_dirty(inode);
166
UFSD("EXIT: ino %lu\n", inode->i_ino);
171
static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
173
struct super_block * sb;
174
struct ufs_sb_private_info * uspi;
175
struct ufs_buffer_head * ind_ubh;
177
u64 tmp, indirect_block, i, frag_to_free;
181
UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
182
inode->i_ino, (unsigned long long)offset, p);
187
uspi = UFS_SB(sb)->s_uspi;
193
tmp = ufs_data_ptr_to_cpu(sb, p);
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);
202
ufs_data_ptr_clear(uspi, p);
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);
213
ufs_data_ptr_clear(uspi, ind);
214
ubh_mark_buffer_dirty(ind_ubh);
215
if (free_count == 0) {
217
free_count = uspi->s_fpb;
218
} else if (free_count > 0 && frag_to_free == tmp - free_count)
219
free_count += uspi->s_fpb;
221
ufs_free_blocks (inode, frag_to_free, free_count);
223
free_count = uspi->s_fpb;
226
mark_inode_dirty(inode);
229
if (free_count > 0) {
230
ufs_free_blocks (inode, frag_to_free, free_count);
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)))
236
if (i >= uspi->s_apb) {
237
tmp = ufs_data_ptr_to_cpu(sb, p);
238
ufs_data_ptr_clear(uspi, p);
240
ufs_free_blocks (inode, tmp, uspi->s_fpb);
241
mark_inode_dirty(inode);
242
ubh_bforget(ind_ubh);
245
if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
246
ubh_sync_block(ind_ubh);
247
ubh_brelse (ind_ubh);
249
UFSD("EXIT: ino %lu\n", inode->i_ino);
254
static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
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;
263
UFSD("ENTER: ino %lu\n", inode->i_ino);
266
uspi = UFS_SB(sb)->s_uspi;
268
dindirect_block = (DIRECT_BLOCK > offset)
269
? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
272
tmp = ufs_data_ptr_to_cpu(sb, p);
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);
281
ufs_data_ptr_clear(uspi, p);
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);
290
retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
291
ubh_mark_buffer_dirty(dind_bh);
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)))
298
if (i >= uspi->s_apb) {
299
tmp = ufs_data_ptr_to_cpu(sb, p);
300
ufs_data_ptr_clear(uspi, p);
302
ufs_free_blocks(inode, tmp, uspi->s_fpb);
303
mark_inode_dirty(inode);
304
ubh_bforget(dind_bh);
307
if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
308
ubh_sync_block(dind_bh);
309
ubh_brelse (dind_bh);
311
UFSD("EXIT: ino %lu\n", inode->i_ino);
316
static int ufs_trunc_tindirect(struct inode *inode)
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;
326
UFSD("ENTER: ino %lu\n", inode->i_ino);
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;
333
p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
334
if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
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);
342
ufs_data_ptr_clear(uspi, p);
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);
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)))
356
if (i >= uspi->s_apb) {
357
tmp = ufs_data_ptr_to_cpu(sb, p);
358
ufs_data_ptr_clear(uspi, p);
360
ufs_free_blocks(inode, tmp, uspi->s_fpb);
361
mark_inode_dirty(inode);
362
ubh_bforget(tind_bh);
365
if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
366
ubh_sync_block(tind_bh);
367
ubh_brelse (tind_bh);
369
UFSD("EXIT: ino %lu\n", inode->i_ino);
373
static int ufs_alloc_lastblock(struct inode *inode)
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;
381
struct page *lastpage;
382
struct buffer_head *bh;
385
lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
392
lastpage = ufs_get_locked_page(mapping, lastfrag >>
393
(PAGE_CACHE_SHIFT - inode->i_blkbits));
394
if (IS_ERR(lastpage)) {
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;
405
err = ufs_getfrag_block(inode, lastfrag, bh, 1);
410
if (buffer_new(bh)) {
411
clear_buffer_new(bh);
412
unmap_underlying_metadata(bh->b_bdev,
415
* we do not zeroize fragment, because of
416
* if it maped to hole, it already contains zeroes
418
set_buffer_uptodate(bh);
419
mark_buffer_dirty(bh);
420
set_page_dirty(lastpage);
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);
429
memset(bh->b_data, 0, sb->s_blocksize);
430
set_buffer_uptodate(bh);
431
mark_buffer_dirty(bh);
433
sync_dirty_buffer(bh);
438
ufs_put_locked_page(lastpage);
443
int ufs_truncate(struct inode *inode, loff_t old_i_size)
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;
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);
454
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
455
S_ISLNK(inode->i_mode)))
457
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
460
err = ufs_alloc_lastblock(inode);
463
i_size_write(inode, old_i_size);
467
block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
470
retry = ufs_trunc_direct(inode);
471
retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
472
ufs_get_direct_data_ptr(uspi, ufsi,
474
retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
475
ufs_get_direct_data_ptr(uspi, ufsi,
477
retry |= ufs_trunc_tindirect (inode);
480
if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
481
ufs_sync_inode (inode);
485
inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
486
ufsi->i_lastfrag = DIRECT_FRAGMENT;
487
mark_inode_dirty(inode);
489
UFSD("EXIT: err %d\n", err);
493
int ufs_setattr(struct dentry *dentry, struct iattr *attr)
495
struct inode *inode = dentry->d_inode;
496
unsigned int ia_valid = attr->ia_valid;
499
error = inode_change_ok(inode, attr);
503
if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
504
loff_t old_i_size = inode->i_size;
506
/* XXX(truncate): truncate_setsize should be called last */
507
truncate_setsize(inode, attr->ia_size);
509
lock_ufs(inode->i_sb);
510
error = ufs_truncate(inode, old_i_size);
511
unlock_ufs(inode->i_sb);
516
setattr_copy(inode, attr);
517
mark_inode_dirty(inode);
521
const struct inode_operations ufs_file_inode_operations = {
522
.setattr = ufs_setattr,