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udf: Convert in-ICB files to use udf_write_begin()
[linux-block.git] / fs / udf / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * inode.c
3 *
4 * PURPOSE
5 * Inode handling routines for the OSTA-UDF(tm) filesystem.
6 *
1da177e4
LT		 7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
16 *
17 * HISTORY
18 *
19 * 10/04/98 dgb Added rudimentary directory functions
20 * 10/07/98 Fully working udf_block_map! It works!
21 * 11/25/98 bmap altered to better support extents
4b11111a
MS		 22 * 12/06/98 blf partition support in udf_iget, udf_block_map
23 * and udf_read_inode
1da177e4
LT		 24 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
25 * block boundaries (which is not actually allowed)
26 * 12/20/98 added support for strategy 4096
27 * 03/07/99 rewrote udf_block_map (again)
28 * New funcs, inode_bmap, udf_next_aext
29 * 04/19/99 Support for writing device EA's for major/minor #
30 */
31
32#include "udfdecl.h"
33#include <linux/mm.h>
1da177e4
LT		 34#include <linux/module.h>
35#include <linux/pagemap.h>
1da177e4
LT		 36#include <linux/writeback.h>
37#include <linux/slab.h>
f845fced 38#include <linux/crc-itu-t.h>
bc112323 39#include <linux/mpage.h>
e2e40f2c 40#include <linux/uio.h>
2f8b5444 41#include <linux/bio.h>
1da177e4
LT		 42
43#include "udf_i.h"
44#include "udf_sb.h"
45
1da177e4
LT		 46#define EXTENT_MERGE_SIZE 5
47
c3367a1b
SM		 48#define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
49 FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
50 FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
51
52#define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
53 FE_PERM_O_DELETE)
54
f3a30be7
JK		 55struct udf_map_rq;
56
faa17292 57static umode_t udf_convert_permissions(struct fileEntry *);
1da177e4 58static int udf_update_inode(struct inode *, int);
49521de1 59static int udf_sync_inode(struct inode *inode);
647bd61a 60static int udf_alloc_i_data(struct inode *inode, size_t size);
b3c03fce 61static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
19fd80de
JK		 62static int udf_insert_aext(struct inode *, struct extent_position,
63 struct kernel_lb_addr, uint32_t);
b490bdd6 64static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
3cc6f844 65 struct kernel_long_ad *, int *);
1da177e4 66static void udf_prealloc_extents(struct inode *, int, int,
3cc6f844
FF		 67 struct kernel_long_ad *, int *);
68static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
19fd80de
JK		 69static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
70 int, struct extent_position *);
36580ed0
JK		 71static int udf_get_block_wb(struct inode *inode, sector_t block,
72 struct buffer_head *bh_result, int create);
1da177e4 73
99600051
NJ		 74static void __udf_clear_extent_cache(struct inode *inode)
75{
76 struct udf_inode_info *iinfo = UDF_I(inode);
77
78 if (iinfo->cached_extent.lstart != -1) {
79 brelse(iinfo->cached_extent.epos.bh);
80 iinfo->cached_extent.lstart = -1;
81 }
82}
83
84/* Invalidate extent cache */
85static void udf_clear_extent_cache(struct inode *inode)
86{
87 struct udf_inode_info *iinfo = UDF_I(inode);
88
89 spin_lock(&iinfo->i_extent_cache_lock);
90 __udf_clear_extent_cache(inode);
91 spin_unlock(&iinfo->i_extent_cache_lock);
92}
93
94/* Return contents of extent cache */
95static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
96 loff_t *lbcount, struct extent_position *pos)
97{
98 struct udf_inode_info *iinfo = UDF_I(inode);
99 int ret = 0;
100
101 spin_lock(&iinfo->i_extent_cache_lock);
102 if ((iinfo->cached_extent.lstart <= bcount) &&
103 (iinfo->cached_extent.lstart != -1)) {
104 /* Cache hit */
105 *lbcount = iinfo->cached_extent.lstart;
106 memcpy(pos, &iinfo->cached_extent.epos,
107 sizeof(struct extent_position));
108 if (pos->bh)
109 get_bh(pos->bh);
110 ret = 1;
111 }
112 spin_unlock(&iinfo->i_extent_cache_lock);
113 return ret;
114}
115
116/* Add extent to extent cache */
117static void udf_update_extent_cache(struct inode *inode, loff_t estart,
b31c9ed9 118 struct extent_position *pos)
99600051
NJ		 119{
120 struct udf_inode_info *iinfo = UDF_I(inode);
121
122 spin_lock(&iinfo->i_extent_cache_lock);
123 /* Invalidate previously cached extent */
124 __udf_clear_extent_cache(inode);
125 if (pos->bh)
126 get_bh(pos->bh);
033c9da0 127 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
99600051 128 iinfo->cached_extent.lstart = estart;
b31c9ed9
FF		 129 switch (iinfo->i_alloc_type) {
130 case ICBTAG_FLAG_AD_SHORT:
131 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
132 break;
133 case ICBTAG_FLAG_AD_LONG:
134 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
135 break;
136 }
99600051
NJ		 137 spin_unlock(&iinfo->i_extent_cache_lock);
138}
b1e32126 139
3aac2b62 140void udf_evict_inode(struct inode *inode)
1da177e4 141{
2c948b3f 142 struct udf_inode_info *iinfo = UDF_I(inode);
3aac2b62
AV		 143 int want_delete = 0;
144
044e2e26
JK		 145 if (!is_bad_inode(inode)) {
146 if (!inode->i_nlink) {
147 want_delete = 1;
148 udf_setsize(inode, 0);
149 udf_update_inode(inode, IS_SYNC(inode));
150 }
151 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
152 inode->i_size != iinfo->i_lenExtents) {
153 udf_warn(inode->i_sb,
154 "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
155 inode->i_ino, inode->i_mode,
156 (unsigned long long)inode->i_size,
157 (unsigned long long)iinfo->i_lenExtents);
158 }
91b0abe3
JW		 159 }
160 truncate_inode_pages_final(&inode->i_data);
3aac2b62 161 invalidate_inode_buffers(inode);
dbd5768f 162 clear_inode(inode);
382a2287
JK		 163 kfree(iinfo->i_data);
164 iinfo->i_data = NULL;
99600051 165 udf_clear_extent_cache(inode);
3aac2b62 166 if (want_delete) {
3aac2b62 167 udf_free_inode(inode);
3aac2b62 168 }
1da177e4
LT		 169}
170
5eec54fc
IA		 171static void udf_write_failed(struct address_space *mapping, loff_t to)
172{
173 struct inode *inode = mapping->host;
174 struct udf_inode_info *iinfo = UDF_I(inode);
175 loff_t isize = inode->i_size;
176
177 if (to > isize) {
7caef267 178 truncate_pagecache(inode, isize);
5eec54fc
IA		 179 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
180 down_write(&iinfo->i_data_sem);
99600051 181 udf_clear_extent_cache(inode);
5eec54fc
IA		 182 udf_truncate_extents(inode);
183 up_write(&iinfo->i_data_sem);
184 }
185 }
186}
187
79d3c6db
JK		 188static int udf_adinicb_writepage(struct page *page,
189 struct writeback_control *wbc, void *data)
378b8e1a 190{
79d3c6db
JK		 191 struct inode *inode = page->mapping->host;
192 char *kaddr;
193 struct udf_inode_info *iinfo = UDF_I(inode);
194
195 BUG_ON(!PageLocked(page));
196
197 kaddr = kmap_atomic(page);
198 memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, i_size_read(inode));
199 SetPageUptodate(page);
200 kunmap_atomic(kaddr);
201 unlock_page(page);
202 mark_inode_dirty(inode);
203
204 return 0;
205}
206
207int udf_writepages(struct address_space *mapping, struct writeback_control *wbc)
208{
209 struct inode *inode = mapping->host;
210 struct udf_inode_info *iinfo = UDF_I(inode);
211
212 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
213 return mpage_writepages(mapping, wbc, udf_get_block_wb);
214 return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
378b8e1a
NJ		 215}
216
b7c31e6f 217int udf_read_folio(struct file *file, struct folio *folio)
1da177e4 218{
b7c31e6f
JK		 219 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
220
221 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
222 udf_adinicb_readpage(&folio->page);
223 folio_unlock(folio);
224 return 0;
225 }
f132ab7d 226 return mpage_read_folio(folio, udf_get_block);
bc112323
NJ		 227}
228
d4388340 229static void udf_readahead(struct readahead_control *rac)
bc112323 230{
d4388340 231 mpage_readahead(rac, udf_get_block);
1da177e4
LT		 232}
233
60b99a1b 234int udf_write_begin(struct file *file, struct address_space *mapping,
9d6b0cd7 235 loff_t pos, unsigned len,
be021ee4 236 struct page **pagep, void **fsdata)
1da177e4 237{
60b99a1b
JK		 238 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
239 struct page *page;
155130a4
CH		 240 int ret;
241
60b99a1b
JK		 242 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
243 ret = block_write_begin(mapping, pos, len, pagep,
244 udf_get_block);
245 if (unlikely(ret))
246 udf_write_failed(mapping, pos + len);
247 return ret;
248 }
249 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
250 return -EIO;
251 page = grab_cache_page_write_begin(mapping, 0);
252 if (!page)
253 return -ENOMEM;
254 *pagep = page;
255 if (!PageUptodate(page))
256 udf_adinicb_readpage(page);
257 return 0;
5eec54fc 258}
155130a4 259
d5abfb1b 260ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
5eec54fc
IA		 261{
262 struct file *file = iocb->ki_filp;
263 struct address_space *mapping = file->f_mapping;
264 struct inode *inode = mapping->host;
a6cbcd4a 265 size_t count = iov_iter_count(iter);
5eec54fc
IA		 266 ssize_t ret;
267
d5abfb1b
JK		 268 /* Fallback to buffered IO for in-ICB files */
269 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
270 return 0;
c8b8e32d 271 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
6f673763 272 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
c8b8e32d 273 udf_write_failed(mapping, iocb->ki_pos + count);
155130a4 274 return ret;
1da177e4
LT		 275}
276
277static sector_t udf_bmap(struct address_space *mapping, sector_t block)
278{
cb00ea35 279 return generic_block_bmap(mapping, block, udf_get_block);
1da177e4
LT		 280}
281
f5e54d6e 282const struct address_space_operations udf_aops = {
e621900a 283 .dirty_folio = block_dirty_folio,
7ba13abb 284 .invalidate_folio = block_invalidate_folio,
f132ab7d 285 .read_folio = udf_read_folio,
d4388340 286 .readahead = udf_readahead,
378b8e1a 287 .writepages = udf_writepages,
5eec54fc
IA		 288 .write_begin = udf_write_begin,
289 .write_end = generic_write_end,
290 .direct_IO = udf_direct_IO,
28de7948 291 .bmap = udf_bmap,
36273e5b 292 .migrate_folio = buffer_migrate_folio,
1da177e4
LT		 293};
294
d2eb8c35
JK		 295/*
296 * Expand file stored in ICB to a normal one-block-file
297 *
d2eb8c35
JK		 298 * This function requires i_mutex held
299 */
7e49b6f2 300int udf_expand_file_adinicb(struct inode *inode)
1da177e4
LT		 301{
302 struct page *page;
303 char *kaddr;
48d6d8ff 304 struct udf_inode_info *iinfo = UDF_I(inode);
7e49b6f2 305 int err;
1da177e4 306
5955102c 307 WARN_ON_ONCE(!inode_is_locked(inode));
48d6d8ff 308 if (!iinfo->i_lenAlloc) {
6a3b37e0 309 down_write(&iinfo->i_data_sem);
1da177e4 310 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 311 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 312 else
48d6d8ff 313 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
7e49b6f2
JK		 314 /* from now on we have normal address_space methods */
315 inode->i_data.a_ops = &udf_aops;
d2eb8c35 316 up_write(&iinfo->i_data_sem);
1da177e4 317 mark_inode_dirty(inode);
7e49b6f2 318 return 0;
1da177e4
LT		 319 }
320
7e49b6f2
JK		 321 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
322 if (!page)
323 return -ENOMEM;
cd7619d6 324
cb00ea35 325 if (!PageUptodate(page)) {
5c26eac4 326 kaddr = kmap_atomic(page);
48d6d8ff 327 memset(kaddr + iinfo->i_lenAlloc, 0x00,
09cbfeaf 328 PAGE_SIZE - iinfo->i_lenAlloc);
382a2287 329 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr,
48d6d8ff 330 iinfo->i_lenAlloc);
1da177e4
LT		 331 flush_dcache_page(page);
332 SetPageUptodate(page);
5c26eac4 333 kunmap_atomic(kaddr);
1da177e4 334 }
d2eb8c35 335 down_write(&iinfo->i_data_sem);
382a2287 336 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
48d6d8ff
MS		 337 iinfo->i_lenAlloc);
338 iinfo->i_lenAlloc = 0;
1da177e4 339 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 340 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 341 else
48d6d8ff 342 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
7e49b6f2
JK		 343 /* from now on we have normal address_space methods */
344 inode->i_data.a_ops = &udf_aops;
7fc3b7c2
JK		 345 set_page_dirty(page);
346 unlock_page(page);
d2eb8c35 347 up_write(&iinfo->i_data_sem);
7fc3b7c2 348 err = filemap_fdatawrite(inode->i_mapping);
7e49b6f2
JK		 349 if (err) {
350 /* Restore everything back so that we don't lose data... */
351 lock_page(page);
d2eb8c35 352 down_write(&iinfo->i_data_sem);
5c26eac4 353 kaddr = kmap_atomic(page);
382a2287 354 memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
5c26eac4 355 kunmap_atomic(kaddr);
7e49b6f2
JK		 356 unlock_page(page);
357 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
358 inode->i_data.a_ops = &udf_adinicb_aops;
ea856919 359 iinfo->i_lenAlloc = inode->i_size;
d2eb8c35 360 up_write(&iinfo->i_data_sem);
7e49b6f2 361 }
09cbfeaf 362 put_page(page);
1da177e4 363 mark_inode_dirty(inode);
7e49b6f2
JK		 364
365 return err;
1da177e4
LT		 366}
367
80942521
JK		 368#define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */
369#define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */
f3a30be7
JK		 370
371#define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */
372#define UDF_BLK_NEW 0x02 /* Block was freshly allocated */
373
374struct udf_map_rq {
375 sector_t lblk;
376 udf_pblk_t pblk;
377 int iflags; /* UDF_MAP_ flags determining behavior */
378 int oflags; /* UDF_BLK_ flags reporting results */
379};
380
381static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
1da177e4 382{
b3c03fce 383 int err;
f3a30be7 384 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 385
f3a30be7
JK		 386 map->oflags = 0;
387 if (!(map->iflags & UDF_MAP_CREATE)) {
364a6665
JK		 388 struct kernel_lb_addr eloc;
389 uint32_t elen;
390 sector_t offset;
391 struct extent_position epos = {};
392
393 down_read(&iinfo->i_data_sem);
394 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
395 == (EXT_RECORDED_ALLOCATED >> 30)) {
396 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
397 offset);
f3a30be7 398 map->oflags |= UDF_BLK_MAPPED;
364a6665
JK		 399 }
400 up_read(&iinfo->i_data_sem);
401 brelse(epos.bh);
402
1da177e4
LT		 403 return 0;
404 }
405
4d0fb621 406 down_write(&iinfo->i_data_sem);
16d05565
JK		 407 /*
408 * Block beyond EOF and prealloc extents? Just discard preallocation
409 * as it is not useful and complicates things.
410 */
f54aa97f 411 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
16d05565 412 udf_discard_prealloc(inode);
99600051 413 udf_clear_extent_cache(inode);
b3c03fce 414 err = inode_getblk(inode, map);
f3a30be7 415 up_write(&iinfo->i_data_sem);
b3c03fce 416 return err;
f3a30be7 417}
28de7948 418
36580ed0
JK		 419static int __udf_get_block(struct inode *inode, sector_t block,
420 struct buffer_head *bh_result, int flags)
f3a30be7
JK		 421{
422 int err;
423 struct udf_map_rq map = {
424 .lblk = block,
36580ed0 425 .iflags = flags,
f3a30be7
JK		 426 };
427
428 err = udf_map_block(inode, &map);
429 if (err < 0)
430 return err;
431 if (map.oflags & UDF_BLK_MAPPED) {
432 map_bh(bh_result, inode->i_sb, map.pblk);
433 if (map.oflags & UDF_BLK_NEW)
434 set_buffer_new(bh_result);
435 }
436 return 0;
1da177e4
LT		 437}
438
36580ed0
JK		 439int udf_get_block(struct inode *inode, sector_t block,
440 struct buffer_head *bh_result, int create)
441{
442 int flags = create ? UDF_MAP_CREATE : 0;
443
444 /*
445 * We preallocate blocks only for regular files. It also makes sense
446 * for directories but there's a problem when to drop the
447 * preallocation. We might use some delayed work for that but I feel
448 * it's overengineering for a filesystem like UDF.
449 */
450 if (!S_ISREG(inode->i_mode))
451 flags |= UDF_MAP_NOPREALLOC;
452 return __udf_get_block(inode, block, bh_result, flags);
453}
454
455/*
456 * We shouldn't be allocating blocks on page writeback since we allocate them
457 * on page fault. We can spot dirty buffers without allocated blocks though
458 * when truncate expands file. These however don't have valid data so we can
459 * safely ignore them. So never allocate blocks from page writeback.
460 */
461static int udf_get_block_wb(struct inode *inode, sector_t block,
462 struct buffer_head *bh_result, int create)
463{
464 return __udf_get_block(inode, block, bh_result, 0);
465}
466
fa33cdbf
SM		 467/* Extend the file with new blocks totaling 'new_block_bytes',
468 * return the number of extents added
469 */
7e49b6f2
JK		 470static int udf_do_extend_file(struct inode *inode,
471 struct extent_position *last_pos,
472 struct kernel_long_ad *last_ext,
fa33cdbf 473 loff_t new_block_bytes)
31170b6a 474{
fa33cdbf 475 uint32_t add;
31170b6a
JK		 476 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
477 struct super_block *sb = inode->i_sb;
48d6d8ff 478 struct udf_inode_info *iinfo;
7e49b6f2 479 int err;
31170b6a
JK		 480
481 /* The previous extent is fake and we should not extend by anything
482 * - there's nothing to do... */
fa33cdbf 483 if (!new_block_bytes && fake)
31170b6a 484 return 0;
28de7948 485
48d6d8ff 486 iinfo = UDF_I(inode);
31170b6a
JK		 487 /* Round the last extent up to a multiple of block size */
488 if (last_ext->extLength & (sb->s_blocksize - 1)) {
489 last_ext->extLength =
28de7948
CG		 490 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
491 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
492 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
48d6d8ff
MS		 493 iinfo->i_lenExtents =
494 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
28de7948 495 ~(sb->s_blocksize - 1);
31170b6a 496 }
28de7948 497
e57191a8 498 add = 0;
31170b6a 499 /* Can we merge with the previous extent? */
4b11111a
MS		 500 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
501 EXT_NOT_RECORDED_NOT_ALLOCATED) {
fa33cdbf
SM		 502 add = (1 << 30) - sb->s_blocksize -
503 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
504 if (add > new_block_bytes)
505 add = new_block_bytes;
506 new_block_bytes -= add;
507 last_ext->extLength += add;
31170b6a
JK		 508 }
509
510 if (fake) {
70bfb3a8
JK		 511 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
512 last_ext->extLength, 1);
513 if (err < 0)
514 goto out_err;
31170b6a 515 count++;
6c371578
JK		 516 } else {
517 struct kernel_lb_addr tmploc;
518 uint32_t tmplen;
519
97e961fd 520 udf_write_aext(inode, last_pos, &last_ext->extLocation,
4b11111a 521 last_ext->extLength, 1);
63c9e47a 522
6c371578 523 /*
63c9e47a
SM		 524 * We've rewritten the last extent. If we are going to add
525 * more extents, we may need to enter possible following
526 * empty indirect extent.
6c371578 527 */
16d05565 528 if (new_block_bytes)
63c9e47a 529 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
6c371578 530 }
e57191a8 531 iinfo->i_lenExtents += add;
28de7948 532
31170b6a 533 /* Managed to do everything necessary? */
fa33cdbf 534 if (!new_block_bytes)
31170b6a
JK		 535 goto out;
536
537 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
538 last_ext->extLocation.logicalBlockNum = 0;
4b11111a 539 last_ext->extLocation.partitionReferenceNum = 0;
fa33cdbf
SM		 540 add = (1 << 30) - sb->s_blocksize;
541 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
28de7948 542
31170b6a 543 /* Create enough extents to cover the whole hole */
fa33cdbf
SM		 544 while (new_block_bytes > add) {
545 new_block_bytes -= add;
7e49b6f2
JK		 546 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
547 last_ext->extLength, 1);
548 if (err)
70bfb3a8 549 goto out_err;
e57191a8 550 iinfo->i_lenExtents += add;
31170b6a
JK		 551 count++;
552 }
fa33cdbf 553 if (new_block_bytes) {
31170b6a 554 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
fa33cdbf 555 new_block_bytes;
7e49b6f2
JK		 556 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
557 last_ext->extLength, 1);
558 if (err)
70bfb3a8 559 goto out_err;
e57191a8 560 iinfo->i_lenExtents += new_block_bytes;
31170b6a
JK		 561 count++;
562 }
28de7948
CG		 563
564out:
31170b6a 565 /* last_pos should point to the last written extent... */
48d6d8ff 566 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 567 last_pos->offset -= sizeof(struct short_ad);
48d6d8ff 568 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 569 last_pos->offset -= sizeof(struct long_ad);
31170b6a 570 else
7e49b6f2 571 return -EIO;
28de7948 572
31170b6a 573 return count;
70bfb3a8
JK		 574out_err:
575 /* Remove extents we've created so far */
576 udf_clear_extent_cache(inode);
577 udf_truncate_extents(inode);
578 return err;
31170b6a
JK		 579}
580
fa33cdbf
SM		 581/* Extend the final block of the file to final_block_len bytes */
582static void udf_do_extend_final_block(struct inode *inode,
583 struct extent_position *last_pos,
584 struct kernel_long_ad *last_ext,
1f3868f0 585 uint32_t new_elen)
fa33cdbf 586{
fa33cdbf
SM		 587 uint32_t added_bytes;
588
1f3868f0
JK		 589 /*
590 * Extent already large enough? It may be already rounded up to block
591 * size...
592 */
593 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
594 return;
83c7423d 595 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
fa33cdbf
SM		 596 last_ext->extLength += added_bytes;
597 UDF_I(inode)->i_lenExtents += added_bytes;
598
599 udf_write_aext(inode, last_pos, &last_ext->extLocation,
600 last_ext->extLength, 1);
601}
602
7e49b6f2
JK		 603static int udf_extend_file(struct inode *inode, loff_t newsize)
604{
605
606 struct extent_position epos;
607 struct kernel_lb_addr eloc;
608 uint32_t elen;
609 int8_t etype;
610 struct super_block *sb = inode->i_sb;
611 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
1f3868f0 612 loff_t new_elen;
7e49b6f2
JK		 613 int adsize;
614 struct udf_inode_info *iinfo = UDF_I(inode);
615 struct kernel_long_ad extent;
fa33cdbf 616 int err = 0;
1f3868f0 617 bool within_last_ext;
7e49b6f2
JK		 618
619 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
620 adsize = sizeof(struct short_ad);
621 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
622 adsize = sizeof(struct long_ad);
623 else
624 BUG();
625
2d532616 626 down_write(&iinfo->i_data_sem);
16d05565
JK		 627 /*
628 * When creating hole in file, just don't bother with preserving
629 * preallocation. It likely won't be very useful anyway.
630 */
631 udf_discard_prealloc(inode);
632
7e49b6f2 633 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
1f3868f0 634 within_last_ext = (etype != -1);
16d05565 635 /* We don't expect extents past EOF... */
1f3868f0 636 WARN_ON_ONCE(within_last_ext &&
16d05565 637 elen > ((loff_t)offset + 1) << inode->i_blkbits);
7e49b6f2 638
7e49b6f2
JK		 639 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
640 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
641 /* File has no extents at all or has empty last
642 * indirect extent! Create a fake extent... */
643 extent.extLocation.logicalBlockNum = 0;
644 extent.extLocation.partitionReferenceNum = 0;
645 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
646 } else {
647 epos.offset -= adsize;
648 etype = udf_next_aext(inode, &epos, &extent.extLocation,
649 &extent.extLength, 0);
650 extent.extLength |= etype << 30;
651 }
fa33cdbf 652
1f3868f0
JK		 653 new_elen = ((loff_t)offset << inode->i_blkbits) |
654 (newsize & (sb->s_blocksize - 1));
fa33cdbf
SM		 655
656 /* File has extent covering the new size (could happen when extending
657 * inside a block)?
658 */
1f3868f0 659 if (within_last_ext) {
fa33cdbf 660 /* Extending file within the last file block */
1f3868f0 661 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
fa33cdbf 662 } else {
1f3868f0 663 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
fa33cdbf
SM		 664 }
665
7e49b6f2
JK		 666 if (err < 0)
667 goto out;
668 err = 0;
7e49b6f2
JK		 669out:
670 brelse(epos.bh);
2d532616 671 up_write(&iinfo->i_data_sem);
7e49b6f2
JK		 672 return err;
673}
674
b3c03fce 675static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
1da177e4 676{
5ca4e4be 677 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
ff116fc8 678 struct extent_position prev_epos, cur_epos, next_epos;
1da177e4 679 int count = 0, startnum = 0, endnum = 0;
85d71244 680 uint32_t elen = 0, tmpelen;
5ca4e4be 681 struct kernel_lb_addr eloc, tmpeloc;
1da177e4 682 int c = 1;
60448b1d 683 loff_t lbcount = 0, b_off = 0;
b3c03fce 684 udf_pblk_t newblocknum;
60448b1d 685 sector_t offset = 0;
1da177e4 686 int8_t etype;
48d6d8ff 687 struct udf_inode_info *iinfo = UDF_I(inode);
b490bdd6 688 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
31170b6a 689 int lastblock = 0;
fb719c59 690 bool isBeyondEOF;
b3c03fce 691 int ret = 0;
1da177e4 692
ff116fc8 693 prev_epos.offset = udf_file_entry_alloc_offset(inode);
48d6d8ff 694 prev_epos.block = iinfo->i_location;
ff116fc8
JK		 695 prev_epos.bh = NULL;
696 cur_epos = next_epos = prev_epos;
b3c03fce 697 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 698
699 /* find the extent which contains the block we are looking for.
cb00ea35
CG		 700 alternate between laarr[0] and laarr[1] for locations of the
701 current extent, and the previous extent */
702 do {
703 if (prev_epos.bh != cur_epos.bh) {
3bf25cb4
JK		 704 brelse(prev_epos.bh);
705 get_bh(cur_epos.bh);
ff116fc8 706 prev_epos.bh = cur_epos.bh;
1da177e4 707 }
cb00ea35 708 if (cur_epos.bh != next_epos.bh) {
3bf25cb4
JK		 709 brelse(cur_epos.bh);
710 get_bh(next_epos.bh);
ff116fc8 711 cur_epos.bh = next_epos.bh;
1da177e4
LT		 712 }
713
714 lbcount += elen;
715
ff116fc8
JK		 716 prev_epos.block = cur_epos.block;
717 cur_epos.block = next_epos.block;
1da177e4 718
ff116fc8
JK		 719 prev_epos.offset = cur_epos.offset;
720 cur_epos.offset = next_epos.offset;
1da177e4 721
4b11111a
MS		 722 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
723 if (etype == -1)
1da177e4
LT		 724 break;
725
726 c = !c;
727
728 laarr[c].extLength = (etype << 30) | elen;
729 laarr[c].extLocation = eloc;
730
731 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
732 pgoal = eloc.logicalBlockNum +
28de7948
CG		 733 ((elen + inode->i_sb->s_blocksize - 1) >>
734 inode->i_sb->s_blocksize_bits);
1da177e4 735
cb00ea35 736 count++;
1da177e4
LT		 737 } while (lbcount + elen <= b_off);
738
739 b_off -= lbcount;
740 offset = b_off >> inode->i_sb->s_blocksize_bits;
85d71244
JK		 741 /*
742 * Move prev_epos and cur_epos into indirect extent if we are at
743 * the pointer to it
744 */
745 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
746 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
1da177e4
LT		 747
748 /* if the extent is allocated and recorded, return the block
cb00ea35 749 if the extent is not a multiple of the blocksize, round up */
1da177e4 750
cb00ea35
CG		 751 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
752 if (elen & (inode->i_sb->s_blocksize - 1)) {
1da177e4 753 elen = EXT_RECORDED_ALLOCATED |
28de7948
CG		 754 ((elen + inode->i_sb->s_blocksize - 1) &
755 ~(inode->i_sb->s_blocksize - 1));
b316c443
JK		 756 iinfo->i_lenExtents =
757 ALIGN(iinfo->i_lenExtents,
758 inode->i_sb->s_blocksize);
7e49b6f2 759 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
1da177e4 760 }
b3c03fce
JK		 761 map->oflags = UDF_BLK_MAPPED;
762 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
02d4ca49 763 goto out_free;
1da177e4
LT		 764 }
765
16d05565 766 /* Are we beyond EOF and preallocated extent? */
cb00ea35 767 if (etype == -1) {
fa33cdbf 768 loff_t hole_len;
16d05565 769
6981498d 770 isBeyondEOF = true;
31170b6a
JK		 771 if (count) {
772 if (c)
773 laarr[0] = laarr[1];
774 startnum = 1;
cb00ea35 775 } else {
31170b6a 776 /* Create a fake extent when there's not one */
4b11111a 777 memset(&laarr[0].extLocation, 0x00,
5ca4e4be 778 sizeof(struct kernel_lb_addr));
31170b6a 779 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
7e49b6f2 780 /* Will udf_do_extend_file() create real extent from
4b11111a 781 a fake one? */
31170b6a
JK		 782 startnum = (offset > 0);
783 }
784 /* Create extents for the hole between EOF and offset */
fa33cdbf
SM		 785 hole_len = (loff_t)offset << inode->i_blkbits;
786 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
b3c03fce 787 if (ret < 0)
02d4ca49 788 goto out_free;
31170b6a
JK		 789 c = 0;
790 offset = 0;
791 count += ret;
36ec52ea
JK		 792 /*
793 * Is there any real extent? - otherwise we overwrite the fake
794 * one...
795 */
796 if (count)
797 c = !c;
798 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
799 inode->i_sb->s_blocksize;
800 memset(&laarr[c].extLocation, 0x00,
801 sizeof(struct kernel_lb_addr));
802 count++;
cb00ea35 803 endnum = c + 1;
1da177e4 804 lastblock = 1;
cb00ea35 805 } else {
6981498d 806 isBeyondEOF = false;
1da177e4
LT		 807 endnum = startnum = ((count > 2) ? 2 : count);
808
4b11111a
MS		 809 /* if the current extent is in position 0,
810 swap it with the previous */
cb00ea35 811 if (!c && count != 1) {
31170b6a
JK		 812 laarr[2] = laarr[0];
813 laarr[0] = laarr[1];
814 laarr[1] = laarr[2];
815 c = 1;
816 }
1da177e4 817
4b11111a
MS		 818 /* if the current block is located in an extent,
819 read the next extent */
820 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
821 if (etype != -1) {
cb00ea35
CG		 822 laarr[c + 1].extLength = (etype << 30) | elen;
823 laarr[c + 1].extLocation = eloc;
824 count++;
825 startnum++;
826 endnum++;
4b11111a 827 } else
1da177e4
LT		 828 lastblock = 1;
829 }
1da177e4
LT		 830
831 /* if the current extent is not recorded but allocated, get the
28de7948 832 * block in the extent corresponding to the requested block */
4b11111a 833 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
1da177e4 834 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
4b11111a 835 else { /* otherwise, allocate a new block */
b3c03fce 836 if (iinfo->i_next_alloc_block == map->lblk)
48d6d8ff 837 goal = iinfo->i_next_alloc_goal;
1da177e4 838
cb00ea35 839 if (!goal) {
4b11111a 840 if (!(goal = pgoal)) /* XXX: what was intended here? */
48d6d8ff 841 goal = iinfo->i_location.logicalBlockNum + 1;
1da177e4
LT		 842 }
843
4b11111a 844 newblocknum = udf_new_block(inode->i_sb, inode,
48d6d8ff 845 iinfo->i_location.partitionReferenceNum,
b3c03fce
JK		 846 goal, &ret);
847 if (!newblocknum)
02d4ca49 848 goto out_free;
fb719c59
NJ		 849 if (isBeyondEOF)
850 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
1da177e4
LT		 851 }
852
4b11111a
MS		 853 /* if the extent the requsted block is located in contains multiple
854 * blocks, split the extent into at most three extents. blocks prior
855 * to requested block, requested block, and blocks after requested
856 * block */
1da177e4
LT		 857 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
858
80942521 859 if (!(map->iflags & UDF_MAP_NOPREALLOC))
81056dd0 860 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
1da177e4
LT		 861
862 /* merge any continuous blocks in laarr */
863 udf_merge_extents(inode, laarr, &endnum);
864
865 /* write back the new extents, inserting new extents if the new number
28de7948
CG		 866 * of extents is greater than the old number, and deleting extents if
867 * the new number of extents is less than the old number */
b3c03fce
JK		 868 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
869 if (ret < 0)
19fd80de 870 goto out_free;
1da177e4 871
b3c03fce 872 map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
48d6d8ff 873 iinfo->i_location.partitionReferenceNum, 0);
b3c03fce
JK		 874 if (!map->pblk) {
875 ret = -EFSCORRUPTED;
02d4ca49 876 goto out_free;
7b0b0933 877 }
b3c03fce
JK		 878 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
879 iinfo->i_next_alloc_block = map->lblk + 1;
de80dae0 880 iinfo->i_next_alloc_goal = newblocknum + 1;
c2050a45 881 inode->i_ctime = current_time(inode);
1da177e4
LT		 882
883 if (IS_SYNC(inode))
884 udf_sync_inode(inode);
885 else
886 mark_inode_dirty(inode);
b3c03fce 887 ret = 0;
02d4ca49
FF		 888out_free:
889 brelse(prev_epos.bh);
890 brelse(cur_epos.bh);
891 brelse(next_epos.bh);
b3c03fce 892 return ret;
1da177e4
LT		 893}
894
cb00ea35 895static void udf_split_extents(struct inode *inode, int *c, int offset,
b490bdd6
SM		 896 udf_pblk_t newblocknum,
897 struct kernel_long_ad *laarr, int *endnum)
1da177e4 898{
4b11111a
MS		 899 unsigned long blocksize = inode->i_sb->s_blocksize;
900 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
901
1da177e4 902 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
4b11111a
MS		 903 (laarr[*c].extLength >> 30) ==
904 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1da177e4
LT		 905 int curr = *c;
906 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a 907 blocksize - 1) >> blocksize_bits;
1da177e4
LT		 908 int8_t etype = (laarr[curr].extLength >> 30);
909
4b11111a 910 if (blen == 1)
28de7948 911 ;
4b11111a 912 else if (!offset || blen == offset + 1) {
cb00ea35
CG		 913 laarr[curr + 2] = laarr[curr + 1];
914 laarr[curr + 1] = laarr[curr];
915 } else {
916 laarr[curr + 3] = laarr[curr + 1];
917 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
918 }
919
920 if (offset) {
921 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
4b11111a 922 udf_free_blocks(inode->i_sb, inode,
97e961fd 923 &laarr[curr].extLocation,
4b11111a
MS		 924 0, offset);
925 laarr[curr].extLength =
926 EXT_NOT_RECORDED_NOT_ALLOCATED |
927 (offset << blocksize_bits);
1da177e4 928 laarr[curr].extLocation.logicalBlockNum = 0;
4b11111a
MS		 929 laarr[curr].extLocation.
930 partitionReferenceNum = 0;
931 } else
1da177e4 932 laarr[curr].extLength = (etype << 30) |
4b11111a 933 (offset << blocksize_bits);
cb00ea35
CG		 934 curr++;
935 (*c)++;
936 (*endnum)++;
1da177e4 937 }
647bd61a 938
1da177e4
LT		 939 laarr[curr].extLocation.logicalBlockNum = newblocknum;
940 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
941 laarr[curr].extLocation.partitionReferenceNum =
c0b34438 942 UDF_I(inode)->i_location.partitionReferenceNum;
1da177e4 943 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
4b11111a 944 blocksize;
cb00ea35 945 curr++;
1da177e4 946
cb00ea35 947 if (blen != offset + 1) {
1da177e4 948 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
4b11111a
MS		 949 laarr[curr].extLocation.logicalBlockNum +=
950 offset + 1;
28de7948 951 laarr[curr].extLength = (etype << 30) |
4b11111a 952 ((blen - (offset + 1)) << blocksize_bits);
cb00ea35
CG		 953 curr++;
954 (*endnum)++;
1da177e4
LT		 955 }
956 }
957}
958
959static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
3cc6f844 960 struct kernel_long_ad *laarr,
cb00ea35 961 int *endnum)
1da177e4
LT		 962{
963 int start, length = 0, currlength = 0, i;
964
cb00ea35 965 if (*endnum >= (c + 1)) {
1da177e4
LT		 966 if (!lastblock)
967 return;
968 else
969 start = c;
cb00ea35 970 } else {
4b11111a
MS		 971 if ((laarr[c + 1].extLength >> 30) ==
972 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
cb00ea35 973 start = c + 1;
4b11111a
MS		 974 length = currlength =
975 (((laarr[c + 1].extLength &
976 UDF_EXTENT_LENGTH_MASK) +
977 inode->i_sb->s_blocksize - 1) >>
978 inode->i_sb->s_blocksize_bits);
979 } else
1da177e4
LT		 980 start = c;
981 }
982
cb00ea35
CG		 983 for (i = start + 1; i <= *endnum; i++) {
984 if (i == *endnum) {
1da177e4
LT		 985 if (lastblock)
986 length += UDF_DEFAULT_PREALLOC_BLOCKS;
4b11111a
MS		 987 } else if ((laarr[i].extLength >> 30) ==
988 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
989 length += (((laarr[i].extLength &
990 UDF_EXTENT_LENGTH_MASK) +
991 inode->i_sb->s_blocksize - 1) >>
992 inode->i_sb->s_blocksize_bits);
993 } else
1da177e4
LT		 994 break;
995 }
996
cb00ea35 997 if (length) {
1da177e4 998 int next = laarr[start].extLocation.logicalBlockNum +
28de7948 999 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a
MS		 1000 inode->i_sb->s_blocksize - 1) >>
1001 inode->i_sb->s_blocksize_bits);
1da177e4 1002 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
4b11111a
MS		 1003 laarr[start].extLocation.partitionReferenceNum,
1004 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1005 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1006 currlength);
28de7948 1007 if (numalloc) {
4b11111a 1008 if (start == (c + 1))
1da177e4 1009 laarr[start].extLength +=
4b11111a
MS		 1010 (numalloc <<
1011 inode->i_sb->s_blocksize_bits);
1012 else {
cb00ea35 1013 memmove(&laarr[c + 2], &laarr[c + 1],
5ca4e4be 1014 sizeof(struct long_ad) * (*endnum - (c + 1)));
cb00ea35
CG		 1015 (*endnum)++;
1016 laarr[c + 1].extLocation.logicalBlockNum = next;
1017 laarr[c + 1].extLocation.partitionReferenceNum =
4b11111a
MS		 1018 laarr[c].extLocation.
1019 partitionReferenceNum;
1020 laarr[c + 1].extLength =
1021 EXT_NOT_RECORDED_ALLOCATED |
1022 (numalloc <<
1023 inode->i_sb->s_blocksize_bits);
cb00ea35 1024 start = c + 1;
1da177e4
LT		 1025 }
1026
cb00ea35 1027 for (i = start + 1; numalloc && i < *endnum; i++) {
4b11111a
MS		 1028 int elen = ((laarr[i].extLength &
1029 UDF_EXTENT_LENGTH_MASK) +
1030 inode->i_sb->s_blocksize - 1) >>
1031 inode->i_sb->s_blocksize_bits;
1da177e4 1032
cb00ea35 1033 if (elen > numalloc) {
1da177e4 1034 laarr[i].extLength -=
4b11111a
MS		 1035 (numalloc <<
1036 inode->i_sb->s_blocksize_bits);
1da177e4 1037 numalloc = 0;
cb00ea35 1038 } else {
1da177e4 1039 numalloc -= elen;
cb00ea35 1040 if (*endnum > (i + 1))
4b11111a
MS		 1041 memmove(&laarr[i],
1042 &laarr[i + 1],
5ca4e4be 1043 sizeof(struct long_ad) *
4b11111a 1044 (*endnum - (i + 1)));
cb00ea35
CG		 1045 i--;
1046 (*endnum)--;
1da177e4
LT		 1047 }
1048 }
c0b34438 1049 UDF_I(inode)->i_lenExtents +=
4b11111a 1050 numalloc << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 1051 }
1052 }
1053}
1054
3cc6f844 1055static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
cb00ea35 1056 int *endnum)
1da177e4
LT		 1057{
1058 int i;
4b11111a
MS		 1059 unsigned long blocksize = inode->i_sb->s_blocksize;
1060 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1da177e4 1061
cb00ea35 1062 for (i = 0; i < (*endnum - 1); i++) {
5ca4e4be
PE		 1063 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1064 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
4b11111a
MS		 1065
1066 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1067 (((li->extLength >> 30) ==
1068 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1069 ((lip1->extLocation.logicalBlockNum -
1070 li->extLocation.logicalBlockNum) ==
1071 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1072 blocksize - 1) >> blocksize_bits)))) {
1073
1074 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
53cafe1d
JK		 1075 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1076 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
4b11111a
MS		 1077 li->extLength = lip1->extLength +
1078 (((li->extLength &
1079 UDF_EXTENT_LENGTH_MASK) +
1080 blocksize - 1) & ~(blocksize - 1));
1081 if (*endnum > (i + 2))
1082 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1083 sizeof(struct long_ad) *
4b11111a
MS		 1084 (*endnum - (i + 2)));
1085 i--;
1086 (*endnum)--;
1da177e4 1087 }
4b11111a
MS		 1088 } else if (((li->extLength >> 30) ==
1089 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1090 ((lip1->extLength >> 30) ==
1091 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
97e961fd 1092 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
4b11111a
MS		 1093 ((li->extLength &
1094 UDF_EXTENT_LENGTH_MASK) +
1095 blocksize - 1) >> blocksize_bits);
1096 li->extLocation.logicalBlockNum = 0;
1097 li->extLocation.partitionReferenceNum = 0;
1098
1099 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1100 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1101 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1102 lip1->extLength = (lip1->extLength -
1103 (li->extLength &
1104 UDF_EXTENT_LENGTH_MASK) +
1105 UDF_EXTENT_LENGTH_MASK) &
1106 ~(blocksize - 1);
1107 li->extLength = (li->extLength &
1108 UDF_EXTENT_FLAG_MASK) +
1109 (UDF_EXTENT_LENGTH_MASK + 1) -
1110 blocksize;
cb00ea35 1111 } else {
4b11111a
MS		 1112 li->extLength = lip1->extLength +
1113 (((li->extLength &
1114 UDF_EXTENT_LENGTH_MASK) +
1115 blocksize - 1) & ~(blocksize - 1));
cb00ea35
CG		 1116 if (*endnum > (i + 2))
1117 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1118 sizeof(struct long_ad) *
4b11111a 1119 (*endnum - (i + 2)));
cb00ea35
CG		 1120 i--;
1121 (*endnum)--;
1da177e4 1122 }
4b11111a
MS		 1123 } else if ((li->extLength >> 30) ==
1124 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1125 udf_free_blocks(inode->i_sb, inode,
97e961fd 1126 &li->extLocation, 0,
4b11111a
MS		 1127 ((li->extLength &
1128 UDF_EXTENT_LENGTH_MASK) +
1129 blocksize - 1) >> blocksize_bits);
1130 li->extLocation.logicalBlockNum = 0;
1131 li->extLocation.partitionReferenceNum = 0;
1132 li->extLength = (li->extLength &
1133 UDF_EXTENT_LENGTH_MASK) |
1134 EXT_NOT_RECORDED_NOT_ALLOCATED;
1da177e4
LT		 1135 }
1136 }
1137}
1138
19fd80de
JK		 1139static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1140 int startnum, int endnum,
1141 struct extent_position *epos)
1da177e4
LT		 1142{
1143 int start = 0, i;
5ca4e4be 1144 struct kernel_lb_addr tmploc;
1da177e4 1145 uint32_t tmplen;
19fd80de 1146 int err;
1da177e4 1147
cb00ea35
CG		 1148 if (startnum > endnum) {
1149 for (i = 0; i < (startnum - endnum); i++)
6c1e4d06 1150 udf_delete_aext(inode, *epos);
cb00ea35
CG		 1151 } else if (startnum < endnum) {
1152 for (i = 0; i < (endnum - startnum); i++) {
19fd80de
JK		 1153 err = udf_insert_aext(inode, *epos,
1154 laarr[i].extLocation,
1155 laarr[i].extLength);
1156 /*
1157 * If we fail here, we are likely corrupting the extent
1158 * list and leaking blocks. At least stop early to
1159 * limit the damage.
1160 */
1161 if (err < 0)
1162 return err;
ff116fc8 1163 udf_next_aext(inode, epos, &laarr[i].extLocation,
cb00ea35
CG		 1164 &laarr[i].extLength, 1);
1165 start++;
1da177e4
LT		 1166 }
1167 }
1168
cb00ea35 1169 for (i = start; i < endnum; i++) {
ff116fc8 1170 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
97e961fd 1171 udf_write_aext(inode, epos, &laarr[i].extLocation,
cb00ea35 1172 laarr[i].extLength, 1);
1da177e4 1173 }
19fd80de 1174 return 0;
1da177e4
LT		 1175}
1176
b490bdd6 1177struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
cb00ea35 1178 int create, int *err)
1da177e4 1179{
cb00ea35 1180 struct buffer_head *bh = NULL;
32f123a3
JK		 1181 struct udf_map_rq map = {
1182 .lblk = block,
1183 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1184 };
1da177e4 1185
32f123a3
JK		 1186 *err = udf_map_block(inode, &map);
1187 if (*err || !(map.oflags & UDF_BLK_MAPPED))
1188 return NULL;
1189
1190 bh = sb_getblk(inode->i_sb, map.pblk);
1191 if (!bh) {
1192 *err = -ENOMEM;
1da177e4 1193 return NULL;
32f123a3
JK		 1194 }
1195 if (map.oflags & UDF_BLK_NEW) {
1196 lock_buffer(bh);
1197 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1198 set_buffer_uptodate(bh);
1199 unlock_buffer(bh);
1200 mark_buffer_dirty_inode(bh, inode);
1201 return bh;
1202 }
1da177e4 1203
59a16786 1204 if (bh_read(bh, 0) >= 0)
1da177e4 1205 return bh;
28de7948 1206
1da177e4
LT		 1207 brelse(bh);
1208 *err = -EIO;
1209 return NULL;
1210}
1211
7e49b6f2 1212int udf_setsize(struct inode *inode, loff_t newsize)
1da177e4 1213{
b9a861fd 1214 int err = 0;
48d6d8ff 1215 struct udf_inode_info *iinfo;
89a4d970 1216 unsigned int bsize = i_blocksize(inode);
1da177e4
LT		 1217
1218 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
cb00ea35 1219 S_ISLNK(inode->i_mode)))
7e49b6f2 1220 return -EINVAL;
1da177e4 1221 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
7e49b6f2 1222 return -EPERM;
1da177e4 1223
b9a861fd 1224 filemap_invalidate_lock(inode->i_mapping);
48d6d8ff 1225 iinfo = UDF_I(inode);
7e49b6f2 1226 if (newsize > inode->i_size) {
7e49b6f2 1227 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
6a3b37e0 1228 if (bsize >=
7e49b6f2 1229 (udf_file_entry_alloc_offset(inode) + newsize)) {
d2eb8c35 1230 down_write(&iinfo->i_data_sem);
7e49b6f2 1231 iinfo->i_lenAlloc = newsize;
2d532616 1232 up_write(&iinfo->i_data_sem);
bb2b6d19
IA		 1233 goto set_size;
1234 }
6a3b37e0
JK		 1235 err = udf_expand_file_adinicb(inode);
1236 if (err)
b9a861fd 1237 goto out_unlock;
7e49b6f2
JK		 1238 }
1239 err = udf_extend_file(inode, newsize);
2d532616 1240 if (err)
b9a861fd 1241 goto out_unlock;
bb2b6d19 1242set_size:
f2e95355 1243 truncate_setsize(inode, newsize);
cb00ea35 1244 } else {
7e49b6f2
JK		 1245 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1246 down_write(&iinfo->i_data_sem);
99600051 1247 udf_clear_extent_cache(inode);
382a2287 1248 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
7e49b6f2
JK		 1249 0x00, bsize - newsize -
1250 udf_file_entry_alloc_offset(inode));
1251 iinfo->i_lenAlloc = newsize;
1252 truncate_setsize(inode, newsize);
1253 up_write(&iinfo->i_data_sem);
1254 goto update_time;
1255 }
1256 err = block_truncate_page(inode->i_mapping, newsize,
1257 udf_get_block);
1258 if (err)
b9a861fd 1259 goto out_unlock;
f2e95355 1260 truncate_setsize(inode, newsize);
4d0fb621 1261 down_write(&iinfo->i_data_sem);
99600051 1262 udf_clear_extent_cache(inode);
2b42be5e 1263 err = udf_truncate_extents(inode);
4d0fb621 1264 up_write(&iinfo->i_data_sem);
2b42be5e 1265 if (err)
b9a861fd 1266 goto out_unlock;
647bd61a 1267 }
7e49b6f2 1268update_time:
c2050a45 1269 inode->i_mtime = inode->i_ctime = current_time(inode);
1da177e4 1270 if (IS_SYNC(inode))
cb00ea35 1271 udf_sync_inode(inode);
1da177e4
LT		 1272 else
1273 mark_inode_dirty(inode);
b9a861fd
JK		 1274out_unlock:
1275 filemap_invalidate_unlock(inode->i_mapping);
1276 return err;
1da177e4
LT		 1277}
1278
c03aa9f6
JK		 1279/*
1280 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1281 * arbitrary - just that we hopefully don't limit any real use of rewritten
1282 * inode on write-once media but avoid looping for too long on corrupted media.
1283 */
1284#define UDF_MAX_ICB_NESTING 1024
1285
6174c2eb 1286static int udf_read_inode(struct inode *inode, bool hidden_inode)
1da177e4
LT		 1287{
1288 struct buffer_head *bh = NULL;
1289 struct fileEntry *fe;
bb7720a0 1290 struct extendedFileEntry *efe;
1da177e4 1291 uint16_t ident;
48d6d8ff 1292 struct udf_inode_info *iinfo = UDF_I(inode);
bb7720a0 1293 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
6d3d5e86 1294 struct kernel_lb_addr *iloc = &iinfo->i_location;
bb7720a0 1295 unsigned int link_count;
c03aa9f6 1296 unsigned int indirections = 0;
79144954 1297 int bs = inode->i_sb->s_blocksize;
6d3d5e86 1298 int ret = -EIO;
0c9850f4 1299 uint32_t uid, gid;
1da177e4 1300
c03aa9f6 1301reread:
1d82a56b 1302 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
fcbf7637 1303 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1d82a56b
FF		 1304 iloc->partitionReferenceNum, sbi->s_partitions);
1305 return -EIO;
1306 }
1307
6d3d5e86
JK		 1308 if (iloc->logicalBlockNum >=
1309 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
fcbf7637 1310 udf_debug("block=%u, partition=%u out of range\n",
6d3d5e86
JK		 1311 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1312 return -EIO;
1313 }
1314
1da177e4
LT		 1315 /*
1316 * Set defaults, but the inode is still incomplete!
1317 * Note: get_new_inode() sets the following on a new inode:
1318 * i_sb = sb
1319 * i_no = ino
1320 * i_flags = sb->s_flags
1321 * i_state = 0
1322 * clean_inode(): zero fills and sets
1323 * i_count = 1
1324 * i_nlink = 1
1325 * i_op = NULL;
1326 */
6d3d5e86 1327 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
cb00ea35 1328 if (!bh) {
fcbf7637 1329 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
6d3d5e86 1330 return -EIO;
1da177e4
LT		 1331 }
1332
1333 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
cb00ea35 1334 ident != TAG_IDENT_USE) {
fcbf7637 1335 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
78ace70c 1336 inode->i_ino, ident);
6d3d5e86 1337 goto out;
1da177e4
LT		 1338 }
1339
1340 fe = (struct fileEntry *)bh->b_data;
bb7720a0 1341 efe = (struct extendedFileEntry *)bh->b_data;
1da177e4 1342
5e0f0017 1343 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1ab92785 1344 struct buffer_head *ibh;
1da177e4 1345
6d3d5e86 1346 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1ab92785 1347 if (ident == TAG_IDENT_IE && ibh) {
5ca4e4be 1348 struct kernel_lb_addr loc;
1ab92785 1349 struct indirectEntry *ie;
1350
1351 ie = (struct indirectEntry *)ibh->b_data;
1352 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1353
c03aa9f6 1354 if (ie->indirectICB.extLength) {
c03aa9f6
JK		 1355 brelse(ibh);
1356 memcpy(&iinfo->i_location, &loc,
1357 sizeof(struct kernel_lb_addr));
1358 if (++indirections > UDF_MAX_ICB_NESTING) {
1359 udf_err(inode->i_sb,
1360 "too many ICBs in ICB hierarchy"
1361 " (max %d supported)\n",
1362 UDF_MAX_ICB_NESTING);
6d3d5e86 1363 goto out;
28de7948 1364 }
6d3d5e86 1365 brelse(bh);
c03aa9f6 1366 goto reread;
1da177e4 1367 }
28de7948 1368 }
1ab92785 1369 brelse(ibh);
5e0f0017 1370 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
fcbf7637 1371 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
78ace70c 1372 le16_to_cpu(fe->icbTag.strategyType));
6d3d5e86 1373 goto out;
1da177e4 1374 }
5e0f0017 1375 if (fe->icbTag.strategyType == cpu_to_le16(4))
48d6d8ff 1376 iinfo->i_strat4096 = 0;
5e0f0017 1377 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
48d6d8ff 1378 iinfo->i_strat4096 = 1;
1da177e4 1379
48d6d8ff 1380 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
4b11111a 1381 ICBTAG_FLAG_AD_MASK;
d288d958
JK		 1382 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1383 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1384 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1385 ret = -EIO;
1386 goto out;
1387 }
fc8033a3 1388 iinfo->i_hidden = hidden_inode;
48d6d8ff
MS		 1389 iinfo->i_unique = 0;
1390 iinfo->i_lenEAttr = 0;
1391 iinfo->i_lenExtents = 0;
1392 iinfo->i_lenAlloc = 0;
1393 iinfo->i_next_alloc_block = 0;
1394 iinfo->i_next_alloc_goal = 0;
5e0f0017 1395 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
48d6d8ff
MS		 1396 iinfo->i_efe = 1;
1397 iinfo->i_use = 0;
79144954 1398 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1399 sizeof(struct extendedFileEntry));
1400 if (ret)
1401 goto out;
382a2287 1402 memcpy(iinfo->i_data,
4b11111a 1403 bh->b_data + sizeof(struct extendedFileEntry),
79144954 1404 bs - sizeof(struct extendedFileEntry));
5e0f0017 1405 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
48d6d8ff
MS		 1406 iinfo->i_efe = 0;
1407 iinfo->i_use = 0;
79144954 1408 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
6d3d5e86
JK		 1409 if (ret)
1410 goto out;
382a2287 1411 memcpy(iinfo->i_data,
c0b34438 1412 bh->b_data + sizeof(struct fileEntry),
79144954 1413 bs - sizeof(struct fileEntry));
5e0f0017 1414 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
48d6d8ff
MS		 1415 iinfo->i_efe = 0;
1416 iinfo->i_use = 1;
1417 iinfo->i_lenAlloc = le32_to_cpu(
4b11111a
MS		 1418 ((struct unallocSpaceEntry *)bh->b_data)->
1419 lengthAllocDescs);
79144954 1420 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1421 sizeof(struct unallocSpaceEntry));
1422 if (ret)
1423 goto out;
382a2287 1424 memcpy(iinfo->i_data,
4b11111a 1425 bh->b_data + sizeof(struct unallocSpaceEntry),
79144954 1426 bs - sizeof(struct unallocSpaceEntry));
6d3d5e86 1427 return 0;
1da177e4
LT		 1428 }
1429
6d3d5e86 1430 ret = -EIO;
c03cad24 1431 read_lock(&sbi->s_cred_lock);
0c9850f4
JK		 1432 uid = le32_to_cpu(fe->uid);
1433 if (uid == UDF_INVALID_ID ||
ca76d2d8 1434 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
0c9850f4
JK		 1435 inode->i_uid = sbi->s_uid;
1436 else
1437 i_uid_write(inode, uid);
1da177e4 1438
0c9850f4
JK		 1439 gid = le32_to_cpu(fe->gid);
1440 if (gid == UDF_INVALID_ID ||
ca76d2d8 1441 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
0c9850f4
JK		 1442 inode->i_gid = sbi->s_gid;
1443 else
1444 i_gid_write(inode, gid);
1da177e4 1445
7ac9bcd5 1446 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1447 sbi->s_fmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1448 inode->i_mode = sbi->s_fmode;
1449 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1450 sbi->s_dmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1451 inode->i_mode = sbi->s_dmode;
1452 else
1453 inode->i_mode = udf_convert_permissions(fe);
1454 inode->i_mode &= ~sbi->s_umask;
c3367a1b
SM		 1455 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1456
c03cad24
JK		 1457 read_unlock(&sbi->s_cred_lock);
1458
bfe86848 1459 link_count = le16_to_cpu(fe->fileLinkCount);
4071b913 1460 if (!link_count) {
6174c2eb
JK		 1461 if (!hidden_inode) {
1462 ret = -ESTALE;
1463 goto out;
1464 }
1465 link_count = 1;
4071b913 1466 }
bfe86848 1467 set_nlink(inode, link_count);
c03cad24
JK		 1468
1469 inode->i_size = le64_to_cpu(fe->informationLength);
1470 iinfo->i_lenExtents = inode->i_size;
1da177e4 1471
48d6d8ff 1472 if (iinfo->i_efe == 0) {
1da177e4 1473 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
28de7948 1474 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1475
c3b9cecd
AB		 1476 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1477 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1478 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1da177e4 1479
48d6d8ff
MS		 1480 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1481 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1482 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
d5e2cf07 1483 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
ab9a3a73
SM		 1484 iinfo->i_streamdir = 0;
1485 iinfo->i_lenStreams = 0;
cb00ea35 1486 } else {
647bd61a 1487 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
cb00ea35 1488 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1489
c3b9cecd
AB		 1490 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1491 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
0220edda 1492 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
c3b9cecd 1493 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1da177e4 1494
48d6d8ff
MS		 1495 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1496 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1497 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
d5e2cf07 1498 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
ab9a3a73
SM		 1499
1500 /* Named streams */
1501 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1502 iinfo->i_locStreamdir =
1503 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1504 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1505 if (iinfo->i_lenStreams >= inode->i_size)
1506 iinfo->i_lenStreams -= inode->i_size;
1507 else
1508 iinfo->i_lenStreams = 0;
1da177e4 1509 }
470cca56 1510 inode->i_generation = iinfo->i_unique;
1da177e4 1511
23b133bd
JK		 1512 /*
1513 * Sanity check length of allocation descriptors and extended attrs to
1514 * avoid integer overflows
1515 */
1516 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1517 goto out;
1518 /* Now do exact checks */
1519 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1520 goto out;
e159332b
JK		 1521 /* Sanity checks for files in ICB so that we don't get confused later */
1522 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1523 /*
1524 * For file in ICB data is stored in allocation descriptor
1525 * so sizes should match
1526 */
1527 if (iinfo->i_lenAlloc != inode->i_size)
1528 goto out;
1529 /* File in ICB has to fit in there... */
79144954 1530 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
e159332b
JK		 1531 goto out;
1532 }
1533
cb00ea35
CG		 1534 switch (fe->icbTag.fileType) {
1535 case ICBTAG_FILE_TYPE_DIRECTORY:
28de7948
CG		 1536 inode->i_op = &udf_dir_inode_operations;
1537 inode->i_fop = &udf_dir_operations;
1538 inode->i_mode |= S_IFDIR;
1539 inc_nlink(inode);
1540 break;
cb00ea35
CG		 1541 case ICBTAG_FILE_TYPE_REALTIME:
1542 case ICBTAG_FILE_TYPE_REGULAR:
1543 case ICBTAG_FILE_TYPE_UNDEF:
742e1795 1544 case ICBTAG_FILE_TYPE_VAT20:
48d6d8ff 1545 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
28de7948
CG		 1546 inode->i_data.a_ops = &udf_adinicb_aops;
1547 else
1548 inode->i_data.a_ops = &udf_aops;
1549 inode->i_op = &udf_file_inode_operations;
1550 inode->i_fop = &udf_file_operations;
1551 inode->i_mode |= S_IFREG;
1552 break;
cb00ea35 1553 case ICBTAG_FILE_TYPE_BLOCK:
28de7948
CG		 1554 inode->i_mode |= S_IFBLK;
1555 break;
cb00ea35 1556 case ICBTAG_FILE_TYPE_CHAR:
28de7948
CG		 1557 inode->i_mode |= S_IFCHR;
1558 break;
cb00ea35 1559 case ICBTAG_FILE_TYPE_FIFO:
28de7948
CG		 1560 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1561 break;
cb00ea35 1562 case ICBTAG_FILE_TYPE_SOCKET:
28de7948
CG		 1563 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1564 break;
cb00ea35 1565 case ICBTAG_FILE_TYPE_SYMLINK:
28de7948 1566 inode->i_data.a_ops = &udf_symlink_aops;
ad4d0532 1567 inode->i_op = &udf_symlink_inode_operations;
21fc61c7 1568 inode_nohighmem(inode);
6ff6b2b3 1569 inode->i_mode = S_IFLNK | 0777;
28de7948 1570 break;
bfb257a5
JK		 1571 case ICBTAG_FILE_TYPE_MAIN:
1572 udf_debug("METADATA FILE-----\n");
1573 break;
1574 case ICBTAG_FILE_TYPE_MIRROR:
1575 udf_debug("METADATA MIRROR FILE-----\n");
1576 break;
1577 case ICBTAG_FILE_TYPE_BITMAP:
1578 udf_debug("METADATA BITMAP FILE-----\n");
1579 break;
cb00ea35 1580 default:
fcbf7637 1581 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
78ace70c 1582 inode->i_ino, fe->icbTag.fileType);
6d3d5e86 1583 goto out;
1da177e4 1584 }
cb00ea35 1585 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
4b11111a
MS		 1586 struct deviceSpec *dsea =
1587 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35
CG		 1588 if (dsea) {
1589 init_special_inode(inode, inode->i_mode,
4b11111a
MS		 1590 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1591 le32_to_cpu(dsea->minorDeviceIdent)));
1da177e4 1592 /* Developer ID ??? */
4b11111a 1593 } else
6d3d5e86 1594 goto out;
1da177e4 1595 }
6d3d5e86
JK		 1596 ret = 0;
1597out:
bb7720a0 1598 brelse(bh);
6d3d5e86 1599 return ret;
1da177e4
LT		 1600}
1601
647bd61a
CG		 1602static int udf_alloc_i_data(struct inode *inode, size_t size)
1603{
48d6d8ff 1604 struct udf_inode_info *iinfo = UDF_I(inode);
382a2287
JK		 1605 iinfo->i_data = kmalloc(size, GFP_KERNEL);
1606 if (!iinfo->i_data)
647bd61a 1607 return -ENOMEM;
647bd61a
CG		 1608 return 0;
1609}
1610
faa17292 1611static umode_t udf_convert_permissions(struct fileEntry *fe)
1da177e4 1612{
faa17292 1613 umode_t mode;
1da177e4
LT		 1614 uint32_t permissions;
1615 uint32_t flags;
1616
1617 permissions = le32_to_cpu(fe->permissions);
1618 flags = le16_to_cpu(fe->icbTag.flags);
1619
6ff6b2b3
FF		 1620 mode = ((permissions) & 0007) |
1621 ((permissions >> 2) & 0070) |
1622 ((permissions >> 4) & 0700) |
4b11111a
MS		 1623 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1624 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1625 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1da177e4
LT		 1626
1627 return mode;
1628}
1629
c3367a1b
SM		 1630void udf_update_extra_perms(struct inode *inode, umode_t mode)
1631{
1632 struct udf_inode_info *iinfo = UDF_I(inode);
1633
1634 /*
1635 * UDF 2.01 sec. 3.3.3.3 Note 2:
1636 * In Unix, delete permission tracks write
1637 */
1638 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1639 if (mode & 0200)
1640 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1641 if (mode & 0020)
1642 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1643 if (mode & 0002)
1644 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1645}
1646
a9185b41 1647int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4 1648{
49521de1 1649 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1da177e4
LT		 1650}
1651
49521de1 1652static int udf_sync_inode(struct inode *inode)
1da177e4
LT		 1653{
1654 return udf_update_inode(inode, 1);
1655}
1656
c3b9cecd 1657static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
7ed0fbd7
FF		 1658{
1659 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1660 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1661 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1662 iinfo->i_crtime = time;
1663}
1664
cb00ea35 1665static int udf_update_inode(struct inode *inode, int do_sync)
1da177e4
LT		 1666{
1667 struct buffer_head *bh = NULL;
1668 struct fileEntry *fe;
1669 struct extendedFileEntry *efe;
b2527bfa 1670 uint64_t lb_recorded;
1da177e4
LT		 1671 uint32_t udfperms;
1672 uint16_t icbflags;
1673 uint16_t crclen;
1da177e4 1674 int err = 0;
6c79e987 1675 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
4b11111a 1676 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
48d6d8ff 1677 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 1678
101ee137 1679 bh = sb_getblk(inode->i_sb,
5833ded9 1680 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
cb00ea35 1681 if (!bh) {
aae917cd 1682 udf_debug("getblk failure\n");
0fd2ba36 1683 return -EIO;
1da177e4
LT		 1684 }
1685
aae917cd
JK		 1686 lock_buffer(bh);
1687 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1da177e4
LT		 1688 fe = (struct fileEntry *)bh->b_data;
1689 efe = (struct extendedFileEntry *)bh->b_data;
1690
aae917cd 1691 if (iinfo->i_use) {
1da177e4 1692 struct unallocSpaceEntry *use =
28de7948 1693 (struct unallocSpaceEntry *)bh->b_data;
1da177e4 1694
48d6d8ff 1695 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
4b11111a 1696 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
382a2287 1697 iinfo->i_data, inode->i_sb->s_blocksize -
4b11111a 1698 sizeof(struct unallocSpaceEntry));
aae917cd 1699 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
70f19f58 1700 crclen = sizeof(struct unallocSpaceEntry);
1da177e4 1701
70f19f58 1702 goto finish;
1da177e4
LT		 1703 }
1704
4d6660eb 1705 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
0c9850f4 1706 fe->uid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1707 else
c2ba138a 1708 fe->uid = cpu_to_le32(i_uid_read(inode));
1da177e4 1709
4d6660eb 1710 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
0c9850f4 1711 fe->gid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1712 else
c2ba138a 1713 fe->gid = cpu_to_le32(i_gid_read(inode));
1da177e4 1714
6ff6b2b3
FF		 1715 udfperms = ((inode->i_mode & 0007)) |
1716 ((inode->i_mode & 0070) << 2) |
1717 ((inode->i_mode & 0700) << 4);
1da177e4 1718
c3367a1b 1719 udfperms |= iinfo->i_extraPerms;
1da177e4
LT		 1720 fe->permissions = cpu_to_le32(udfperms);
1721
8a70ee33 1722 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1da177e4 1723 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
fc8033a3
JK		 1724 else {
1725 if (iinfo->i_hidden)
1726 fe->fileLinkCount = cpu_to_le16(0);
1727 else
1728 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1729 }
1da177e4
LT		 1730
1731 fe->informationLength = cpu_to_le64(inode->i_size);
1732
cb00ea35 1733 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
5ca4e4be 1734 struct regid *eid;
28de7948
CG		 1735 struct deviceSpec *dsea =
1736 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35 1737 if (!dsea) {
1da177e4 1738 dsea = (struct deviceSpec *)
28de7948
CG		 1739 udf_add_extendedattr(inode,
1740 sizeof(struct deviceSpec) +
5ca4e4be 1741 sizeof(struct regid), 12, 0x3);
1da177e4
LT		 1742 dsea->attrType = cpu_to_le32(12);
1743 dsea->attrSubtype = 1;
4b11111a
MS		 1744 dsea->attrLength = cpu_to_le32(
1745 sizeof(struct deviceSpec) +
5ca4e4be
PE		 1746 sizeof(struct regid));
1747 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1da177e4 1748 }
5ca4e4be 1749 eid = (struct regid *)dsea->impUse;
033c9da0 1750 memset(eid, 0, sizeof(*eid));
1da177e4
LT		 1751 strcpy(eid->ident, UDF_ID_DEVELOPER);
1752 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1753 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1754 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1755 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1756 }
1757
b2527bfa
SN		 1758 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1759 lb_recorded = 0; /* No extents => no blocks! */
1760 else
1761 lb_recorded =
1762 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1763 (blocksize_bits - 9);
1764
48d6d8ff 1765 if (iinfo->i_efe == 0) {
c0b34438 1766 memcpy(bh->b_data + sizeof(struct fileEntry),
382a2287 1767 iinfo->i_data,
cb00ea35 1768 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
b2527bfa 1769 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1770
c3b9cecd
AB		 1771 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1772 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1773 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
5ca4e4be 1774 memset(&(fe->impIdent), 0, sizeof(struct regid));
1da177e4
LT		 1775 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1776 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1777 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1778 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1779 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1780 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1781 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1782 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1783 crclen = sizeof(struct fileEntry);
cb00ea35 1784 } else {
4b11111a 1785 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
382a2287 1786 iinfo->i_data,
4b11111a
MS		 1787 inode->i_sb->s_blocksize -
1788 sizeof(struct extendedFileEntry));
ab9a3a73
SM		 1789 efe->objectSize =
1790 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
b2527bfa 1791 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1792
ab9a3a73
SM		 1793 if (iinfo->i_streamdir) {
1794 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1795
1796 icb_lad->extLocation =
1797 cpu_to_lelb(iinfo->i_locStreamdir);
1798 icb_lad->extLength =
1799 cpu_to_le32(inode->i_sb->s_blocksize);
1800 }
1801
c3b9cecd
AB		 1802 udf_adjust_time(iinfo, inode->i_atime);
1803 udf_adjust_time(iinfo, inode->i_mtime);
1804 udf_adjust_time(iinfo, inode->i_ctime);
1da177e4 1805
c3b9cecd
AB		 1806 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1807 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
56774805 1808 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
c3b9cecd 1809 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1da177e4 1810
033c9da0 1811 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1da177e4
LT		 1812 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1813 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1814 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1815 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1816 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1817 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1818 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1819 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1820 crclen = sizeof(struct extendedFileEntry);
1821 }
70f19f58
SM		 1822
1823finish:
48d6d8ff 1824 if (iinfo->i_strat4096) {
1da177e4
LT		 1825 fe->icbTag.strategyType = cpu_to_le16(4096);
1826 fe->icbTag.strategyParameter = cpu_to_le16(1);
1827 fe->icbTag.numEntries = cpu_to_le16(2);
cb00ea35 1828 } else {
1da177e4
LT		 1829 fe->icbTag.strategyType = cpu_to_le16(4);
1830 fe->icbTag.numEntries = cpu_to_le16(1);
1831 }
1832
70f19f58
SM		 1833 if (iinfo->i_use)
1834 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1835 else if (S_ISDIR(inode->i_mode))
1da177e4
LT		 1836 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1837 else if (S_ISREG(inode->i_mode))
1838 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1839 else if (S_ISLNK(inode->i_mode))
1840 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1841 else if (S_ISBLK(inode->i_mode))
1842 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1843 else if (S_ISCHR(inode->i_mode))
1844 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1845 else if (S_ISFIFO(inode->i_mode))
1846 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1847 else if (S_ISSOCK(inode->i_mode))
1848 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1849
48d6d8ff 1850 icbflags = iinfo->i_alloc_type |
28de7948
CG		 1851 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1852 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1853 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1854 (le16_to_cpu(fe->icbTag.flags) &
1855 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1856 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1da177e4
LT		 1857
1858 fe->icbTag.flags = cpu_to_le16(icbflags);
6c79e987 1859 if (sbi->s_udfrev >= 0x0200)
1da177e4
LT		 1860 fe->descTag.descVersion = cpu_to_le16(3);
1861 else
1862 fe->descTag.descVersion = cpu_to_le16(2);
6c79e987 1863 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
4b11111a 1864 fe->descTag.tagLocation = cpu_to_le32(
48d6d8ff 1865 iinfo->i_location.logicalBlockNum);
aae917cd 1866 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1da177e4 1867 fe->descTag.descCRCLength = cpu_to_le16(crclen);
5ca4e4be 1868 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
f845fced 1869 crclen));
3f2587bb 1870 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1da177e4 1871
5833ded9 1872 set_buffer_uptodate(bh);
aae917cd
JK		 1873 unlock_buffer(bh);
1874
1da177e4
LT		 1875 /* write the data blocks */
1876 mark_buffer_dirty(bh);
cb00ea35 1877 if (do_sync) {
1da177e4 1878 sync_dirty_buffer(bh);
aae917cd 1879 if (buffer_write_io_error(bh)) {
78ace70c
JP		 1880 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1881 inode->i_ino);
1da177e4
LT		 1882 err = -EIO;
1883 }
1884 }
3bf25cb4 1885 brelse(bh);
28de7948 1886
1da177e4
LT		 1887 return err;
1888}
1889
6174c2eb
JK		 1890struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1891 bool hidden_inode)
1da177e4
LT		 1892{
1893 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1894 struct inode *inode = iget_locked(sb, block);
6d3d5e86 1895 int err;
1da177e4
LT		 1896
1897 if (!inode)
6d3d5e86 1898 return ERR_PTR(-ENOMEM);
1da177e4 1899
85a37983
JK		 1900 if (!(inode->i_state & I_NEW)) {
1901 if (UDF_I(inode)->i_hidden != hidden_inode) {
1902 iput(inode);
1903 return ERR_PTR(-EFSCORRUPTED);
1904 }
6d3d5e86 1905 return inode;
85a37983 1906 }
1da177e4 1907
6d3d5e86 1908 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
6174c2eb 1909 err = udf_read_inode(inode, hidden_inode);
6d3d5e86
JK		 1910 if (err < 0) {
1911 iget_failed(inode);
1912 return ERR_PTR(err);
1da177e4 1913 }
6d3d5e86 1914 unlock_new_inode(inode);
1da177e4
LT		 1915
1916 return inode;
1da177e4
LT		 1917}
1918
b490bdd6 1919int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
fcea62ba 1920 struct extent_position *epos)
1da177e4 1921{
fcea62ba
JK		 1922 struct super_block *sb = inode->i_sb;
1923 struct buffer_head *bh;
1da177e4 1924 struct allocExtDesc *aed;
fcea62ba
JK		 1925 struct extent_position nepos;
1926 struct kernel_lb_addr neloc;
1927 int ver, adsize;
1da177e4 1928
fcea62ba
JK		 1929 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1930 adsize = sizeof(struct short_ad);
1931 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1932 adsize = sizeof(struct long_ad);
1da177e4 1933 else
4f1b1519 1934 return -EIO;
fcea62ba
JK		 1935
1936 neloc.logicalBlockNum = block;
1937 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1938
101ee137 1939 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
fcea62ba
JK		 1940 if (!bh)
1941 return -EIO;
1942 lock_buffer(bh);
1943 memset(bh->b_data, 0x00, sb->s_blocksize);
1944 set_buffer_uptodate(bh);
1945 unlock_buffer(bh);
1946 mark_buffer_dirty_inode(bh, inode);
1947
1948 aed = (struct allocExtDesc *)(bh->b_data);
1949 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1950 aed->previousAllocExtLocation =
1951 cpu_to_le32(epos->block.logicalBlockNum);
1952 }
1953 aed->lengthAllocDescs = cpu_to_le32(0);
1954 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1955 ver = 3;
1da177e4 1956 else
fcea62ba
JK		 1957 ver = 2;
1958 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1959 sizeof(struct tag));
1960
1961 nepos.block = neloc;
1962 nepos.offset = sizeof(struct allocExtDesc);
1963 nepos.bh = bh;
1964
1965 /*
1966 * Do we have to copy current last extent to make space for indirect
1967 * one?
1968 */
1969 if (epos->offset + adsize > sb->s_blocksize) {
1970 struct kernel_lb_addr cp_loc;
1971 uint32_t cp_len;
1972 int cp_type;
1973
1974 epos->offset -= adsize;
1975 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1976 cp_len |= ((uint32_t)cp_type) << 30;
1977
1978 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1979 udf_write_aext(inode, epos, &nepos.block,
800552ce 1980 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 1981 } else {
1982 __udf_add_aext(inode, epos, &nepos.block,
800552ce 1983 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 1984 }
1985
1986 brelse(epos->bh);
1987 *epos = nepos;
1988
1989 return 0;
1990}
1991
1992/*
1993 * Append extent at the given position - should be the first free one in inode
1994 * / indirect extent. This function assumes there is enough space in the inode
1995 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1996 */
1997int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1998 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1999{
2000 struct udf_inode_info *iinfo = UDF_I(inode);
2001 struct allocExtDesc *aed;
2002 int adsize;
1da177e4 2003
48d6d8ff 2004 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2005 adsize = sizeof(struct short_ad);
48d6d8ff 2006 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2007 adsize = sizeof(struct long_ad);
1da177e4 2008 else
7e49b6f2 2009 return -EIO;
1da177e4 2010
fcea62ba
JK		 2011 if (!epos->bh) {
2012 WARN_ON(iinfo->i_lenAlloc !=
2013 epos->offset - udf_file_entry_alloc_offset(inode));
2014 } else {
2015 aed = (struct allocExtDesc *)epos->bh->b_data;
2016 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2017 epos->offset - sizeof(struct allocExtDesc));
2018 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1da177e4
LT		 2019 }
2020
7e49b6f2 2021 udf_write_aext(inode, epos, eloc, elen, inc);
1da177e4 2022
cb00ea35 2023 if (!epos->bh) {
48d6d8ff 2024 iinfo->i_lenAlloc += adsize;
1da177e4 2025 mark_inode_dirty(inode);
cb00ea35 2026 } else {
ff116fc8 2027 aed = (struct allocExtDesc *)epos->bh->b_data;
c2104fda 2028 le32_add_cpu(&aed->lengthAllocDescs, adsize);
4b11111a
MS		 2029 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2030 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2031 udf_update_tag(epos->bh->b_data,
2032 epos->offset + (inc ? 0 : adsize));
1da177e4 2033 else
4b11111a
MS		 2034 udf_update_tag(epos->bh->b_data,
2035 sizeof(struct allocExtDesc));
ff116fc8 2036 mark_buffer_dirty_inode(epos->bh, inode);
1da177e4
LT		 2037 }
2038
7e49b6f2 2039 return 0;
1da177e4
LT		 2040}
2041
fcea62ba
JK		 2042/*
2043 * Append extent at given position - should be the first free one in inode
2044 * / indirect extent. Takes care of allocating and linking indirect blocks.
2045 */
2046int udf_add_aext(struct inode *inode, struct extent_position *epos,
2047 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2048{
2049 int adsize;
2050 struct super_block *sb = inode->i_sb;
2051
2052 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2053 adsize = sizeof(struct short_ad);
2054 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2055 adsize = sizeof(struct long_ad);
2056 else
2057 return -EIO;
2058
2059 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2060 int err;
b490bdd6 2061 udf_pblk_t new_block;
fcea62ba
JK		 2062
2063 new_block = udf_new_block(sb, NULL,
2064 epos->block.partitionReferenceNum,
2065 epos->block.logicalBlockNum, &err);
2066 if (!new_block)
2067 return -ENOSPC;
2068
2069 err = udf_setup_indirect_aext(inode, new_block, epos);
2070 if (err)
2071 return err;
2072 }
2073
2074 return __udf_add_aext(inode, epos, eloc, elen, inc);
2075}
2076
7e49b6f2
JK		 2077void udf_write_aext(struct inode *inode, struct extent_position *epos,
2078 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1da177e4
LT		 2079{
2080 int adsize;
2081 uint8_t *ptr;
5ca4e4be
PE		 2082 struct short_ad *sad;
2083 struct long_ad *lad;
48d6d8ff 2084 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 2085
ff116fc8 2086 if (!epos->bh)
382a2287 2087 ptr = iinfo->i_data + epos->offset -
4b11111a 2088 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2089 iinfo->i_lenEAttr;
1da177e4 2090 else
ff116fc8 2091 ptr = epos->bh->b_data + epos->offset;
1da177e4 2092
48d6d8ff 2093 switch (iinfo->i_alloc_type) {
cb00ea35 2094 case ICBTAG_FLAG_AD_SHORT:
5ca4e4be 2095 sad = (struct short_ad *)ptr;
28de7948 2096 sad->extLength = cpu_to_le32(elen);
97e961fd 2097 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
5ca4e4be 2098 adsize = sizeof(struct short_ad);
28de7948 2099 break;
cb00ea35 2100 case ICBTAG_FLAG_AD_LONG:
5ca4e4be 2101 lad = (struct long_ad *)ptr;
28de7948 2102 lad->extLength = cpu_to_le32(elen);
97e961fd 2103 lad->extLocation = cpu_to_lelb(*eloc);
28de7948 2104 memset(lad->impUse, 0x00, sizeof(lad->impUse));
5ca4e4be 2105 adsize = sizeof(struct long_ad);
28de7948 2106 break;
cb00ea35 2107 default:
7e49b6f2 2108 return;
1da177e4
LT		 2109 }
2110
cb00ea35 2111 if (epos->bh) {
28de7948 2112 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2113 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
4b11111a
MS		 2114 struct allocExtDesc *aed =
2115 (struct allocExtDesc *)epos->bh->b_data;
ff116fc8 2116 udf_update_tag(epos->bh->b_data,
4b11111a
MS		 2117 le32_to_cpu(aed->lengthAllocDescs) +
2118 sizeof(struct allocExtDesc));
1da177e4 2119 }
ff116fc8 2120 mark_buffer_dirty_inode(epos->bh, inode);
28de7948 2121 } else {
1da177e4 2122 mark_inode_dirty(inode);
28de7948 2123 }
1da177e4
LT		 2124
2125 if (inc)
ff116fc8 2126 epos->offset += adsize;
1da177e4
LT		 2127}
2128
b0918d9f
VN		 2129/*
2130 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2131 * someone does some weird stuff.
2132 */
2133#define UDF_MAX_INDIR_EXTS 16
2134
4b11111a 2135int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2136 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2137{
2138 int8_t etype;
b0918d9f 2139 unsigned int indirections = 0;
1da177e4 2140
ff116fc8 2141 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
800552ce 2142 (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
b490bdd6 2143 udf_pblk_t block;
b0918d9f
VN		 2144
2145 if (++indirections > UDF_MAX_INDIR_EXTS) {
2146 udf_err(inode->i_sb,
2147 "too many indirect extents in inode %lu\n",
2148 inode->i_ino);
2149 return -1;
2150 }
2151
ff116fc8
JK		 2152 epos->block = *eloc;
2153 epos->offset = sizeof(struct allocExtDesc);
3bf25cb4 2154 brelse(epos->bh);
97e961fd 2155 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
101ee137 2156 epos->bh = sb_bread(inode->i_sb, block);
4b11111a 2157 if (!epos->bh) {
fcbf7637 2158 udf_debug("reading block %u failed!\n", block);
1da177e4
LT		 2159 return -1;
2160 }
2161 }
2162
2163 return etype;
2164}
2165
4b11111a 2166int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2167 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2168{
2169 int alen;
2170 int8_t etype;
2171 uint8_t *ptr;
5ca4e4be
PE		 2172 struct short_ad *sad;
2173 struct long_ad *lad;
48d6d8ff 2174 struct udf_inode_info *iinfo = UDF_I(inode);
28de7948 2175
cb00ea35 2176 if (!epos->bh) {
ff116fc8
JK		 2177 if (!epos->offset)
2178 epos->offset = udf_file_entry_alloc_offset(inode);
382a2287 2179 ptr = iinfo->i_data + epos->offset -
4b11111a 2180 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2181 iinfo->i_lenEAttr;
4b11111a 2182 alen = udf_file_entry_alloc_offset(inode) +
48d6d8ff 2183 iinfo->i_lenAlloc;
cb00ea35 2184 } else {
ff116fc8
JK		 2185 if (!epos->offset)
2186 epos->offset = sizeof(struct allocExtDesc);
2187 ptr = epos->bh->b_data + epos->offset;
28de7948 2188 alen = sizeof(struct allocExtDesc) +
4b11111a
MS		 2189 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2190 lengthAllocDescs);
1da177e4
LT		 2191 }
2192
48d6d8ff 2193 switch (iinfo->i_alloc_type) {
cb00ea35 2194 case ICBTAG_FLAG_AD_SHORT:
4b11111a
MS		 2195 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2196 if (!sad)
28de7948
CG		 2197 return -1;
2198 etype = le32_to_cpu(sad->extLength) >> 30;
2199 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
4b11111a 2200 eloc->partitionReferenceNum =
48d6d8ff 2201 iinfo->i_location.partitionReferenceNum;
28de7948
CG		 2202 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2203 break;
cb00ea35 2204 case ICBTAG_FLAG_AD_LONG:
4b11111a
MS		 2205 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2206 if (!lad)
1da177e4 2207 return -1;
28de7948
CG		 2208 etype = le32_to_cpu(lad->extLength) >> 30;
2209 *eloc = lelb_to_cpu(lad->extLocation);
2210 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2211 break;
2212 default:
fcbf7637 2213 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
28de7948 2214 return -1;
1da177e4
LT		 2215 }
2216
2217 return etype;
2218}
2219
19fd80de
JK		 2220static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2221 struct kernel_lb_addr neloc, uint32_t nelen)
1da177e4 2222{
5ca4e4be 2223 struct kernel_lb_addr oeloc;
1da177e4
LT		 2224 uint32_t oelen;
2225 int8_t etype;
19fd80de 2226 int err;
1da177e4 2227
ff116fc8 2228 if (epos.bh)
3bf25cb4 2229 get_bh(epos.bh);
1da177e4 2230
cb00ea35 2231 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
97e961fd 2232 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1da177e4
LT		 2233 neloc = oeloc;
2234 nelen = (etype << 30) | oelen;
2235 }
19fd80de 2236 err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
3bf25cb4 2237 brelse(epos.bh);
28de7948 2238
19fd80de 2239 return err;
1da177e4
LT		 2240}
2241
6c1e4d06 2242int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
1da177e4 2243{
ff116fc8
JK		 2244 struct extent_position oepos;
2245 int adsize;
1da177e4
LT		 2246 int8_t etype;
2247 struct allocExtDesc *aed;
48d6d8ff 2248 struct udf_inode_info *iinfo;
6c1e4d06
JK		 2249 struct kernel_lb_addr eloc;
2250 uint32_t elen;
1da177e4 2251
cb00ea35 2252 if (epos.bh) {
3bf25cb4
JK		 2253 get_bh(epos.bh);
2254 get_bh(epos.bh);
1da177e4
LT		 2255 }
2256
48d6d8ff
MS		 2257 iinfo = UDF_I(inode);
2258 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2259 adsize = sizeof(struct short_ad);
48d6d8ff 2260 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2261 adsize = sizeof(struct long_ad);
1da177e4
LT		 2262 else
2263 adsize = 0;
2264
ff116fc8
JK		 2265 oepos = epos;
2266 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1da177e4
LT		 2267 return -1;
2268
cb00ea35 2269 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
97e961fd 2270 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
cb00ea35 2271 if (oepos.bh != epos.bh) {
ff116fc8 2272 oepos.block = epos.block;
3bf25cb4
JK		 2273 brelse(oepos.bh);
2274 get_bh(epos.bh);
ff116fc8
JK		 2275 oepos.bh = epos.bh;
2276 oepos.offset = epos.offset - adsize;
1da177e4
LT		 2277 }
2278 }
5ca4e4be 2279 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1da177e4
LT		 2280 elen = 0;
2281
cb00ea35 2282 if (epos.bh != oepos.bh) {
97e961fd
PE		 2283 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2284 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2285 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2286 if (!oepos.bh) {
48d6d8ff 2287 iinfo->i_lenAlloc -= (adsize * 2);
1da177e4 2288 mark_inode_dirty(inode);
cb00ea35 2289 } else {
ff116fc8 2290 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2291 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
28de7948 2292 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2293 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2294 udf_update_tag(oepos.bh->b_data,
2295 oepos.offset - (2 * adsize));
1da177e4 2296 else
4b11111a
MS		 2297 udf_update_tag(oepos.bh->b_data,
2298 sizeof(struct allocExtDesc));
ff116fc8 2299 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4 2300 }
cb00ea35 2301 } else {
97e961fd 2302 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2303 if (!oepos.bh) {
48d6d8ff 2304 iinfo->i_lenAlloc -= adsize;
1da177e4 2305 mark_inode_dirty(inode);
cb00ea35 2306 } else {
ff116fc8 2307 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2308 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
28de7948 2309 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2310 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2311 udf_update_tag(oepos.bh->b_data,
2312 epos.offset - adsize);
1da177e4 2313 else
4b11111a
MS		 2314 udf_update_tag(oepos.bh->b_data,
2315 sizeof(struct allocExtDesc));
ff116fc8 2316 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4
LT		 2317 }
2318 }
647bd61a 2319
3bf25cb4
JK		 2320 brelse(epos.bh);
2321 brelse(oepos.bh);
28de7948 2322
1da177e4
LT		 2323 return (elen >> 30);
2324}
2325
4b11111a 2326int8_t inode_bmap(struct inode *inode, sector_t block,
5ca4e4be 2327 struct extent_position *pos, struct kernel_lb_addr *eloc,
4b11111a 2328 uint32_t *elen, sector_t *offset)
1da177e4 2329{
4b11111a 2330 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
bbc9abd2 2331 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
1da177e4 2332 int8_t etype;
48d6d8ff 2333 struct udf_inode_info *iinfo;
1da177e4 2334
48d6d8ff 2335 iinfo = UDF_I(inode);
99600051
NJ		 2336 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2337 pos->offset = 0;
2338 pos->block = iinfo->i_location;
2339 pos->bh = NULL;
2340 }
1da177e4 2341 *elen = 0;
cb00ea35 2342 do {
4b11111a
MS		 2343 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2344 if (etype == -1) {
2345 *offset = (bcount - lbcount) >> blocksize_bits;
48d6d8ff 2346 iinfo->i_lenExtents = lbcount;
1da177e4
LT		 2347 return -1;
2348 }
2349 lbcount += *elen;
2350 } while (lbcount <= bcount);
99600051 2351 /* update extent cache */
b31c9ed9 2352 udf_update_extent_cache(inode, lbcount - *elen, pos);
4b11111a 2353 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
1da177e4
LT		 2354
2355 return etype;
2356}
Linux 6.x block layer and io_uring tree(s)