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Merge tag 'v6.8-rc-part2-smb-client' of git://git.samba.org/sfrench/cifs-2.6
[linux-block.git] / fs / udf / inode.c
CommitLineData
5ce34554 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * inode.c
4 *
5 * PURPOSE
6 * Inode handling routines for the OSTA-UDF(tm) filesystem.
7 *
1da177e4 8 * COPYRIGHT
1da177e4
LT		 9 * (C) 1998 Dave Boynton
10 * (C) 1998-2004 Ben Fennema
11 * (C) 1999-2000 Stelias Computing Inc
12 *
13 * HISTORY
14 *
15 * 10/04/98 dgb Added rudimentary directory functions
16 * 10/07/98 Fully working udf_block_map! It works!
17 * 11/25/98 bmap altered to better support extents
4b11111a
MS		 18 * 12/06/98 blf partition support in udf_iget, udf_block_map
19 * and udf_read_inode
1da177e4
LT		 20 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
21 * block boundaries (which is not actually allowed)
22 * 12/20/98 added support for strategy 4096
23 * 03/07/99 rewrote udf_block_map (again)
24 * New funcs, inode_bmap, udf_next_aext
25 * 04/19/99 Support for writing device EA's for major/minor #
26 */
27
28#include "udfdecl.h"
29#include <linux/mm.h>
1da177e4
LT		 30#include <linux/module.h>
31#include <linux/pagemap.h>
1da177e4
LT		 32#include <linux/writeback.h>
33#include <linux/slab.h>
f845fced 34#include <linux/crc-itu-t.h>
bc112323 35#include <linux/mpage.h>
e2e40f2c 36#include <linux/uio.h>
2f8b5444 37#include <linux/bio.h>
1da177e4
LT		 38
39#include "udf_i.h"
40#include "udf_sb.h"
41
1da177e4
LT		 42#define EXTENT_MERGE_SIZE 5
43
c3367a1b
SM		 44#define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
45 FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
46 FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
47
48#define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
49 FE_PERM_O_DELETE)
50
f3a30be7
JK		 51struct udf_map_rq;
52
faa17292 53static umode_t udf_convert_permissions(struct fileEntry *);
1da177e4 54static int udf_update_inode(struct inode *, int);
49521de1 55static int udf_sync_inode(struct inode *inode);
647bd61a 56static int udf_alloc_i_data(struct inode *inode, size_t size);
b3c03fce 57static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
19fd80de
JK		 58static int udf_insert_aext(struct inode *, struct extent_position,
59 struct kernel_lb_addr, uint32_t);
b490bdd6 60static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
3cc6f844 61 struct kernel_long_ad *, int *);
1da177e4 62static void udf_prealloc_extents(struct inode *, int, int,
3cc6f844
FF		 63 struct kernel_long_ad *, int *);
64static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
19fd80de
JK		 65static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
66 int, struct extent_position *);
36580ed0
JK		 67static int udf_get_block_wb(struct inode *inode, sector_t block,
68 struct buffer_head *bh_result, int create);
1da177e4 69
99600051
NJ		 70static void __udf_clear_extent_cache(struct inode *inode)
71{
72 struct udf_inode_info *iinfo = UDF_I(inode);
73
74 if (iinfo->cached_extent.lstart != -1) {
75 brelse(iinfo->cached_extent.epos.bh);
76 iinfo->cached_extent.lstart = -1;
77 }
78}
79
80/* Invalidate extent cache */
81static void udf_clear_extent_cache(struct inode *inode)
82{
83 struct udf_inode_info *iinfo = UDF_I(inode);
84
85 spin_lock(&iinfo->i_extent_cache_lock);
86 __udf_clear_extent_cache(inode);
87 spin_unlock(&iinfo->i_extent_cache_lock);
88}
89
90/* Return contents of extent cache */
91static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
92 loff_t *lbcount, struct extent_position *pos)
93{
94 struct udf_inode_info *iinfo = UDF_I(inode);
95 int ret = 0;
96
97 spin_lock(&iinfo->i_extent_cache_lock);
98 if ((iinfo->cached_extent.lstart <= bcount) &&
99 (iinfo->cached_extent.lstart != -1)) {
100 /* Cache hit */
101 *lbcount = iinfo->cached_extent.lstart;
102 memcpy(pos, &iinfo->cached_extent.epos,
103 sizeof(struct extent_position));
104 if (pos->bh)
105 get_bh(pos->bh);
106 ret = 1;
107 }
108 spin_unlock(&iinfo->i_extent_cache_lock);
109 return ret;
110}
111
112/* Add extent to extent cache */
113static void udf_update_extent_cache(struct inode *inode, loff_t estart,
b31c9ed9 114 struct extent_position *pos)
99600051
NJ		 115{
116 struct udf_inode_info *iinfo = UDF_I(inode);
117
118 spin_lock(&iinfo->i_extent_cache_lock);
119 /* Invalidate previously cached extent */
120 __udf_clear_extent_cache(inode);
121 if (pos->bh)
122 get_bh(pos->bh);
033c9da0 123 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
99600051 124 iinfo->cached_extent.lstart = estart;
b31c9ed9
FF		 125 switch (iinfo->i_alloc_type) {
126 case ICBTAG_FLAG_AD_SHORT:
127 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
128 break;
129 case ICBTAG_FLAG_AD_LONG:
130 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
131 break;
132 }
99600051
NJ		 133 spin_unlock(&iinfo->i_extent_cache_lock);
134}
b1e32126 135
3aac2b62 136void udf_evict_inode(struct inode *inode)
1da177e4 137{
2c948b3f 138 struct udf_inode_info *iinfo = UDF_I(inode);
3aac2b62
AV		 139 int want_delete = 0;
140
044e2e26
JK		 141 if (!is_bad_inode(inode)) {
142 if (!inode->i_nlink) {
143 want_delete = 1;
144 udf_setsize(inode, 0);
145 udf_update_inode(inode, IS_SYNC(inode));
146 }
147 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
148 inode->i_size != iinfo->i_lenExtents) {
149 udf_warn(inode->i_sb,
150 "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
151 inode->i_ino, inode->i_mode,
152 (unsigned long long)inode->i_size,
153 (unsigned long long)iinfo->i_lenExtents);
154 }
91b0abe3
JW		 155 }
156 truncate_inode_pages_final(&inode->i_data);
3aac2b62 157 invalidate_inode_buffers(inode);
dbd5768f 158 clear_inode(inode);
382a2287
JK		 159 kfree(iinfo->i_data);
160 iinfo->i_data = NULL;
99600051 161 udf_clear_extent_cache(inode);
3aac2b62 162 if (want_delete) {
3aac2b62 163 udf_free_inode(inode);
3aac2b62 164 }
1da177e4
LT		 165}
166
5eec54fc
IA		 167static void udf_write_failed(struct address_space *mapping, loff_t to)
168{
169 struct inode *inode = mapping->host;
170 struct udf_inode_info *iinfo = UDF_I(inode);
171 loff_t isize = inode->i_size;
172
173 if (to > isize) {
7caef267 174 truncate_pagecache(inode, isize);
5eec54fc
IA		 175 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
176 down_write(&iinfo->i_data_sem);
99600051 177 udf_clear_extent_cache(inode);
5eec54fc
IA		 178 udf_truncate_extents(inode);
179 up_write(&iinfo->i_data_sem);
180 }
181 }
182}
183
3822a7c4 184static int udf_adinicb_writepage(struct folio *folio,
79d3c6db 185 struct writeback_control *wbc, void *data)
378b8e1a 186{
96acbef6 187 struct inode *inode = folio->mapping->host;
79d3c6db
JK		 188 struct udf_inode_info *iinfo = UDF_I(inode);
189
96acbef6
MWO		 190 BUG_ON(!folio_test_locked(folio));
191 BUG_ON(folio->index != 0);
192 memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 0,
5cfc4532 193 i_size_read(inode));
96acbef6 194 folio_unlock(folio);
79d3c6db
JK		 195 mark_inode_dirty(inode);
196
197 return 0;
198}
199
759e4d74
JK		 200static int udf_writepages(struct address_space *mapping,
201 struct writeback_control *wbc)
79d3c6db
JK		 202{
203 struct inode *inode = mapping->host;
204 struct udf_inode_info *iinfo = UDF_I(inode);
205
206 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
207 return mpage_writepages(mapping, wbc, udf_get_block_wb);
208 return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
378b8e1a
NJ		 209}
210
174cb748
JK		 211static void udf_adinicb_readpage(struct page *page)
212{
213 struct inode *inode = page->mapping->host;
214 char *kaddr;
215 struct udf_inode_info *iinfo = UDF_I(inode);
216 loff_t isize = i_size_read(inode);
217
7b7f6865 218 kaddr = kmap_local_page(page);
174cb748
JK		 219 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr, isize);
220 memset(kaddr + isize, 0, PAGE_SIZE - isize);
221 flush_dcache_page(page);
222 SetPageUptodate(page);
7b7f6865 223 kunmap_local(kaddr);
174cb748
JK		 224}
225
759e4d74 226static int udf_read_folio(struct file *file, struct folio *folio)
1da177e4 227{
b7c31e6f
JK		 228 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
229
230 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
231 udf_adinicb_readpage(&folio->page);
232 folio_unlock(folio);
233 return 0;
234 }
f132ab7d 235 return mpage_read_folio(folio, udf_get_block);
bc112323
NJ		 236}
237
d4388340 238static void udf_readahead(struct readahead_control *rac)
bc112323 239{
cecb1f06
JK		 240 struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
241
242 /*
243 * No readahead needed for in-ICB files and udf_get_block() would get
244 * confused for such file anyway.
245 */
246 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
247 return;
248
d4388340 249 mpage_readahead(rac, udf_get_block);
1da177e4
LT		 250}
251
759e4d74
JK		 252static int udf_write_begin(struct file *file, struct address_space *mapping,
253 loff_t pos, unsigned len,
254 struct page **pagep, void **fsdata)
1da177e4 255{
60b99a1b
JK		 256 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
257 struct page *page;
155130a4
CH		 258 int ret;
259
60b99a1b
JK		 260 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
261 ret = block_write_begin(mapping, pos, len, pagep,
262 udf_get_block);
263 if (unlikely(ret))
264 udf_write_failed(mapping, pos + len);
265 return ret;
266 }
267 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
268 return -EIO;
269 page = grab_cache_page_write_begin(mapping, 0);
270 if (!page)
271 return -ENOMEM;
272 *pagep = page;
273 if (!PageUptodate(page))
274 udf_adinicb_readpage(page);
275 return 0;
5eec54fc 276}
155130a4 277
759e4d74
JK		 278static int udf_write_end(struct file *file, struct address_space *mapping,
279 loff_t pos, unsigned len, unsigned copied,
280 struct page *page, void *fsdata)
c694e40b
JK		 281{
282 struct inode *inode = file_inode(file);
283 loff_t last_pos;
284
285 if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
286 return generic_write_end(file, mapping, pos, len, copied, page,
287 fsdata);
288 last_pos = pos + copied;
289 if (last_pos > inode->i_size)
290 i_size_write(inode, last_pos);
291 set_page_dirty(page);
292 unlock_page(page);
293 put_page(page);
294
295 return copied;
296}
297
759e4d74 298static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
5eec54fc
IA		 299{
300 struct file *file = iocb->ki_filp;
301 struct address_space *mapping = file->f_mapping;
302 struct inode *inode = mapping->host;
a6cbcd4a 303 size_t count = iov_iter_count(iter);
5eec54fc
IA		 304 ssize_t ret;
305
d5abfb1b
JK		 306 /* Fallback to buffered IO for in-ICB files */
307 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
308 return 0;
c8b8e32d 309 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
6f673763 310 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
c8b8e32d 311 udf_write_failed(mapping, iocb->ki_pos + count);
155130a4 312 return ret;
1da177e4
LT		 313}
314
315static sector_t udf_bmap(struct address_space *mapping, sector_t block)
316{
907c6c2f
JK		 317 struct udf_inode_info *iinfo = UDF_I(mapping->host);
318
319 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
320 return -EINVAL;
cb00ea35 321 return generic_block_bmap(mapping, block, udf_get_block);
1da177e4
LT		 322}
323
f5e54d6e 324const struct address_space_operations udf_aops = {
e621900a 325 .dirty_folio = block_dirty_folio,
7ba13abb 326 .invalidate_folio = block_invalidate_folio,
f132ab7d 327 .read_folio = udf_read_folio,
d4388340 328 .readahead = udf_readahead,
378b8e1a 329 .writepages = udf_writepages,
5eec54fc 330 .write_begin = udf_write_begin,
c694e40b 331 .write_end = udf_write_end,
5eec54fc 332 .direct_IO = udf_direct_IO,
28de7948 333 .bmap = udf_bmap,
36273e5b 334 .migrate_folio = buffer_migrate_folio,
1da177e4
LT		 335};
336
d2eb8c35
JK		 337/*
338 * Expand file stored in ICB to a normal one-block-file
339 *
d2eb8c35
JK		 340 * This function requires i_mutex held
341 */
7e49b6f2 342int udf_expand_file_adinicb(struct inode *inode)
1da177e4
LT		 343{
344 struct page *page;
48d6d8ff 345 struct udf_inode_info *iinfo = UDF_I(inode);
7e49b6f2 346 int err;
1da177e4 347
5955102c 348 WARN_ON_ONCE(!inode_is_locked(inode));
48d6d8ff 349 if (!iinfo->i_lenAlloc) {
6a3b37e0 350 down_write(&iinfo->i_data_sem);
1da177e4 351 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 352 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 353 else
48d6d8ff 354 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
d2eb8c35 355 up_write(&iinfo->i_data_sem);
1da177e4 356 mark_inode_dirty(inode);
7e49b6f2 357 return 0;
1da177e4
LT		 358 }
359
7e49b6f2
JK		 360 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
361 if (!page)
362 return -ENOMEM;
cd7619d6 363
1eeceaec
JK		 364 if (!PageUptodate(page))
365 udf_adinicb_readpage(page);
d2eb8c35 366 down_write(&iinfo->i_data_sem);
382a2287 367 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
48d6d8ff
MS		 368 iinfo->i_lenAlloc);
369 iinfo->i_lenAlloc = 0;
1da177e4 370 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 371 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 372 else
48d6d8ff 373 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
7fc3b7c2
JK		 374 set_page_dirty(page);
375 unlock_page(page);
d2eb8c35 376 up_write(&iinfo->i_data_sem);
7fc3b7c2 377 err = filemap_fdatawrite(inode->i_mapping);
7e49b6f2
JK		 378 if (err) {
379 /* Restore everything back so that we don't lose data... */
380 lock_page(page);
d2eb8c35 381 down_write(&iinfo->i_data_sem);
1eeceaec
JK		 382 memcpy_to_page(page, 0, iinfo->i_data + iinfo->i_lenEAttr,
383 inode->i_size);
7e49b6f2
JK		 384 unlock_page(page);
385 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
ea856919 386 iinfo->i_lenAlloc = inode->i_size;
d2eb8c35 387 up_write(&iinfo->i_data_sem);
7e49b6f2 388 }
09cbfeaf 389 put_page(page);
1da177e4 390 mark_inode_dirty(inode);
7e49b6f2
JK		 391
392 return err;
1da177e4
LT		 393}
394
80942521
JK		 395#define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */
396#define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */
f3a30be7
JK		 397
398#define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */
399#define UDF_BLK_NEW 0x02 /* Block was freshly allocated */
400
401struct udf_map_rq {
402 sector_t lblk;
403 udf_pblk_t pblk;
404 int iflags; /* UDF_MAP_ flags determining behavior */
405 int oflags; /* UDF_BLK_ flags reporting results */
406};
407
408static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
1da177e4 409{
b3c03fce 410 int err;
f3a30be7 411 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 412
63bceed8
JK		 413 if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
414 return -EFSCORRUPTED;
415
f3a30be7
JK		 416 map->oflags = 0;
417 if (!(map->iflags & UDF_MAP_CREATE)) {
364a6665
JK		 418 struct kernel_lb_addr eloc;
419 uint32_t elen;
420 sector_t offset;
421 struct extent_position epos = {};
422
423 down_read(&iinfo->i_data_sem);
424 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
425 == (EXT_RECORDED_ALLOCATED >> 30)) {
426 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
427 offset);
f3a30be7 428 map->oflags |= UDF_BLK_MAPPED;
364a6665
JK		 429 }
430 up_read(&iinfo->i_data_sem);
431 brelse(epos.bh);
432
1da177e4
LT		 433 return 0;
434 }
435
4d0fb621 436 down_write(&iinfo->i_data_sem);
16d05565
JK		 437 /*
438 * Block beyond EOF and prealloc extents? Just discard preallocation
439 * as it is not useful and complicates things.
440 */
f54aa97f 441 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
16d05565 442 udf_discard_prealloc(inode);
99600051 443 udf_clear_extent_cache(inode);
b3c03fce 444 err = inode_getblk(inode, map);
f3a30be7 445 up_write(&iinfo->i_data_sem);
b3c03fce 446 return err;
f3a30be7 447}
28de7948 448
36580ed0
JK		 449static int __udf_get_block(struct inode *inode, sector_t block,
450 struct buffer_head *bh_result, int flags)
f3a30be7
JK		 451{
452 int err;
453 struct udf_map_rq map = {
454 .lblk = block,
36580ed0 455 .iflags = flags,
f3a30be7
JK		 456 };
457
458 err = udf_map_block(inode, &map);
459 if (err < 0)
460 return err;
461 if (map.oflags & UDF_BLK_MAPPED) {
462 map_bh(bh_result, inode->i_sb, map.pblk);
463 if (map.oflags & UDF_BLK_NEW)
464 set_buffer_new(bh_result);
465 }
466 return 0;
1da177e4
LT		 467}
468
36580ed0
JK		 469int udf_get_block(struct inode *inode, sector_t block,
470 struct buffer_head *bh_result, int create)
471{
472 int flags = create ? UDF_MAP_CREATE : 0;
473
474 /*
475 * We preallocate blocks only for regular files. It also makes sense
476 * for directories but there's a problem when to drop the
477 * preallocation. We might use some delayed work for that but I feel
478 * it's overengineering for a filesystem like UDF.
479 */
480 if (!S_ISREG(inode->i_mode))
481 flags |= UDF_MAP_NOPREALLOC;
482 return __udf_get_block(inode, block, bh_result, flags);
483}
484
485/*
486 * We shouldn't be allocating blocks on page writeback since we allocate them
487 * on page fault. We can spot dirty buffers without allocated blocks though
488 * when truncate expands file. These however don't have valid data so we can
489 * safely ignore them. So never allocate blocks from page writeback.
490 */
491static int udf_get_block_wb(struct inode *inode, sector_t block,
492 struct buffer_head *bh_result, int create)
493{
494 return __udf_get_block(inode, block, bh_result, 0);
495}
496
fa33cdbf
SM		 497/* Extend the file with new blocks totaling 'new_block_bytes',
498 * return the number of extents added
499 */
7e49b6f2
JK		 500static int udf_do_extend_file(struct inode *inode,
501 struct extent_position *last_pos,
502 struct kernel_long_ad *last_ext,
fa33cdbf 503 loff_t new_block_bytes)
31170b6a 504{
fa33cdbf 505 uint32_t add;
31170b6a
JK		 506 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
507 struct super_block *sb = inode->i_sb;
48d6d8ff 508 struct udf_inode_info *iinfo;
7e49b6f2 509 int err;
31170b6a
JK		 510
511 /* The previous extent is fake and we should not extend by anything
512 * - there's nothing to do... */
fa33cdbf 513 if (!new_block_bytes && fake)
31170b6a 514 return 0;
28de7948 515
48d6d8ff 516 iinfo = UDF_I(inode);
31170b6a
JK		 517 /* Round the last extent up to a multiple of block size */
518 if (last_ext->extLength & (sb->s_blocksize - 1)) {
519 last_ext->extLength =
28de7948
CG		 520 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
521 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
522 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
48d6d8ff
MS		 523 iinfo->i_lenExtents =
524 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
28de7948 525 ~(sb->s_blocksize - 1);
31170b6a 526 }
28de7948 527
e57191a8 528 add = 0;
31170b6a 529 /* Can we merge with the previous extent? */
4b11111a
MS		 530 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
531 EXT_NOT_RECORDED_NOT_ALLOCATED) {
fa33cdbf
SM		 532 add = (1 << 30) - sb->s_blocksize -
533 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
534 if (add > new_block_bytes)
535 add = new_block_bytes;
536 new_block_bytes -= add;
537 last_ext->extLength += add;
31170b6a
JK		 538 }
539
540 if (fake) {
70bfb3a8
JK		 541 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
542 last_ext->extLength, 1);
543 if (err < 0)
544 goto out_err;
31170b6a 545 count++;
6c371578
JK		 546 } else {
547 struct kernel_lb_addr tmploc;
548 uint32_t tmplen;
549
97e961fd 550 udf_write_aext(inode, last_pos, &last_ext->extLocation,
4b11111a 551 last_ext->extLength, 1);
63c9e47a 552
6c371578 553 /*
63c9e47a
SM		 554 * We've rewritten the last extent. If we are going to add
555 * more extents, we may need to enter possible following
556 * empty indirect extent.
6c371578 557 */
16d05565 558 if (new_block_bytes)
63c9e47a 559 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
6c371578 560 }
e57191a8 561 iinfo->i_lenExtents += add;
28de7948 562
31170b6a 563 /* Managed to do everything necessary? */
fa33cdbf 564 if (!new_block_bytes)
31170b6a
JK		 565 goto out;
566
567 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
568 last_ext->extLocation.logicalBlockNum = 0;
4b11111a 569 last_ext->extLocation.partitionReferenceNum = 0;
fa33cdbf
SM		 570 add = (1 << 30) - sb->s_blocksize;
571 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
28de7948 572
31170b6a 573 /* Create enough extents to cover the whole hole */
fa33cdbf
SM		 574 while (new_block_bytes > add) {
575 new_block_bytes -= add;
7e49b6f2
JK		 576 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
577 last_ext->extLength, 1);
578 if (err)
70bfb3a8 579 goto out_err;
e57191a8 580 iinfo->i_lenExtents += add;
31170b6a
JK		 581 count++;
582 }
fa33cdbf 583 if (new_block_bytes) {
31170b6a 584 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
fa33cdbf 585 new_block_bytes;
7e49b6f2
JK		 586 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
587 last_ext->extLength, 1);
588 if (err)
70bfb3a8 589 goto out_err;
e57191a8 590 iinfo->i_lenExtents += new_block_bytes;
31170b6a
JK		 591 count++;
592 }
28de7948
CG		 593
594out:
31170b6a 595 /* last_pos should point to the last written extent... */
48d6d8ff 596 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 597 last_pos->offset -= sizeof(struct short_ad);
48d6d8ff 598 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 599 last_pos->offset -= sizeof(struct long_ad);
31170b6a 600 else
7e49b6f2 601 return -EIO;
28de7948 602
31170b6a 603 return count;
70bfb3a8
JK		 604out_err:
605 /* Remove extents we've created so far */
606 udf_clear_extent_cache(inode);
607 udf_truncate_extents(inode);
608 return err;
31170b6a
JK		 609}
610
fa33cdbf
SM		 611/* Extend the final block of the file to final_block_len bytes */
612static void udf_do_extend_final_block(struct inode *inode,
613 struct extent_position *last_pos,
614 struct kernel_long_ad *last_ext,
1f3868f0 615 uint32_t new_elen)
fa33cdbf 616{
fa33cdbf
SM		 617 uint32_t added_bytes;
618
1f3868f0
JK		 619 /*
620 * Extent already large enough? It may be already rounded up to block
621 * size...
622 */
623 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
624 return;
83c7423d 625 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
fa33cdbf
SM		 626 last_ext->extLength += added_bytes;
627 UDF_I(inode)->i_lenExtents += added_bytes;
628
629 udf_write_aext(inode, last_pos, &last_ext->extLocation,
630 last_ext->extLength, 1);
631}
632
7e49b6f2
JK		 633static int udf_extend_file(struct inode *inode, loff_t newsize)
634{
635
636 struct extent_position epos;
637 struct kernel_lb_addr eloc;
638 uint32_t elen;
639 int8_t etype;
640 struct super_block *sb = inode->i_sb;
641 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
1f3868f0 642 loff_t new_elen;
7e49b6f2
JK		 643 int adsize;
644 struct udf_inode_info *iinfo = UDF_I(inode);
645 struct kernel_long_ad extent;
fa33cdbf 646 int err = 0;
1f3868f0 647 bool within_last_ext;
7e49b6f2
JK		 648
649 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
650 adsize = sizeof(struct short_ad);
651 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
652 adsize = sizeof(struct long_ad);
653 else
654 BUG();
655
2d532616 656 down_write(&iinfo->i_data_sem);
16d05565
JK		 657 /*
658 * When creating hole in file, just don't bother with preserving
659 * preallocation. It likely won't be very useful anyway.
660 */
661 udf_discard_prealloc(inode);
662
7e49b6f2 663 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
1f3868f0 664 within_last_ext = (etype != -1);
16d05565 665 /* We don't expect extents past EOF... */
1f3868f0 666 WARN_ON_ONCE(within_last_ext &&
16d05565 667 elen > ((loff_t)offset + 1) << inode->i_blkbits);
7e49b6f2 668
7e49b6f2
JK		 669 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
670 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
671 /* File has no extents at all or has empty last
672 * indirect extent! Create a fake extent... */
673 extent.extLocation.logicalBlockNum = 0;
674 extent.extLocation.partitionReferenceNum = 0;
675 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
676 } else {
677 epos.offset -= adsize;
678 etype = udf_next_aext(inode, &epos, &extent.extLocation,
679 &extent.extLength, 0);
680 extent.extLength |= etype << 30;
681 }
fa33cdbf 682
1f3868f0
JK		 683 new_elen = ((loff_t)offset << inode->i_blkbits) |
684 (newsize & (sb->s_blocksize - 1));
fa33cdbf
SM		 685
686 /* File has extent covering the new size (could happen when extending
687 * inside a block)?
688 */
1f3868f0 689 if (within_last_ext) {
fa33cdbf 690 /* Extending file within the last file block */
1f3868f0 691 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
fa33cdbf 692 } else {
1f3868f0 693 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
fa33cdbf
SM		 694 }
695
7e49b6f2
JK		 696 if (err < 0)
697 goto out;
698 err = 0;
7e49b6f2
JK		 699out:
700 brelse(epos.bh);
2d532616 701 up_write(&iinfo->i_data_sem);
7e49b6f2
JK		 702 return err;
703}
704
b3c03fce 705static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
1da177e4 706{
5ca4e4be 707 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
ff116fc8 708 struct extent_position prev_epos, cur_epos, next_epos;
1da177e4 709 int count = 0, startnum = 0, endnum = 0;
85d71244 710 uint32_t elen = 0, tmpelen;
5ca4e4be 711 struct kernel_lb_addr eloc, tmpeloc;
1da177e4 712 int c = 1;
60448b1d 713 loff_t lbcount = 0, b_off = 0;
b3c03fce 714 udf_pblk_t newblocknum;
60448b1d 715 sector_t offset = 0;
1da177e4 716 int8_t etype;
48d6d8ff 717 struct udf_inode_info *iinfo = UDF_I(inode);
b490bdd6 718 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
31170b6a 719 int lastblock = 0;
fb719c59 720 bool isBeyondEOF;
b3c03fce 721 int ret = 0;
1da177e4 722
ff116fc8 723 prev_epos.offset = udf_file_entry_alloc_offset(inode);
48d6d8ff 724 prev_epos.block = iinfo->i_location;
ff116fc8
JK		 725 prev_epos.bh = NULL;
726 cur_epos = next_epos = prev_epos;
b3c03fce 727 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 728
729 /* find the extent which contains the block we are looking for.
cb00ea35
CG		 730 alternate between laarr[0] and laarr[1] for locations of the
731 current extent, and the previous extent */
732 do {
733 if (prev_epos.bh != cur_epos.bh) {
3bf25cb4
JK		 734 brelse(prev_epos.bh);
735 get_bh(cur_epos.bh);
ff116fc8 736 prev_epos.bh = cur_epos.bh;
1da177e4 737 }
cb00ea35 738 if (cur_epos.bh != next_epos.bh) {
3bf25cb4
JK		 739 brelse(cur_epos.bh);
740 get_bh(next_epos.bh);
ff116fc8 741 cur_epos.bh = next_epos.bh;
1da177e4
LT		 742 }
743
744 lbcount += elen;
745
ff116fc8
JK		 746 prev_epos.block = cur_epos.block;
747 cur_epos.block = next_epos.block;
1da177e4 748
ff116fc8
JK		 749 prev_epos.offset = cur_epos.offset;
750 cur_epos.offset = next_epos.offset;
1da177e4 751
4b11111a
MS		 752 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
753 if (etype == -1)
1da177e4
LT		 754 break;
755
756 c = !c;
757
758 laarr[c].extLength = (etype << 30) | elen;
759 laarr[c].extLocation = eloc;
760
761 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
762 pgoal = eloc.logicalBlockNum +
28de7948
CG		 763 ((elen + inode->i_sb->s_blocksize - 1) >>
764 inode->i_sb->s_blocksize_bits);
1da177e4 765
cb00ea35 766 count++;
1da177e4
LT		 767 } while (lbcount + elen <= b_off);
768
769 b_off -= lbcount;
770 offset = b_off >> inode->i_sb->s_blocksize_bits;
85d71244
JK		 771 /*
772 * Move prev_epos and cur_epos into indirect extent if we are at
773 * the pointer to it
774 */
775 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
776 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
1da177e4
LT		 777
778 /* if the extent is allocated and recorded, return the block
cb00ea35 779 if the extent is not a multiple of the blocksize, round up */
1da177e4 780
cb00ea35
CG		 781 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
782 if (elen & (inode->i_sb->s_blocksize - 1)) {
1da177e4 783 elen = EXT_RECORDED_ALLOCATED |
28de7948
CG		 784 ((elen + inode->i_sb->s_blocksize - 1) &
785 ~(inode->i_sb->s_blocksize - 1));
b316c443
JK		 786 iinfo->i_lenExtents =
787 ALIGN(iinfo->i_lenExtents,
788 inode->i_sb->s_blocksize);
7e49b6f2 789 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
1da177e4 790 }
b3c03fce
JK		 791 map->oflags = UDF_BLK_MAPPED;
792 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
02d4ca49 793 goto out_free;
1da177e4
LT		 794 }
795
16d05565 796 /* Are we beyond EOF and preallocated extent? */
cb00ea35 797 if (etype == -1) {
fa33cdbf 798 loff_t hole_len;
16d05565 799
6981498d 800 isBeyondEOF = true;
31170b6a
JK		 801 if (count) {
802 if (c)
803 laarr[0] = laarr[1];
804 startnum = 1;
cb00ea35 805 } else {
31170b6a 806 /* Create a fake extent when there's not one */
4b11111a 807 memset(&laarr[0].extLocation, 0x00,
5ca4e4be 808 sizeof(struct kernel_lb_addr));
31170b6a 809 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
7e49b6f2 810 /* Will udf_do_extend_file() create real extent from
4b11111a 811 a fake one? */
31170b6a
JK		 812 startnum = (offset > 0);
813 }
814 /* Create extents for the hole between EOF and offset */
fa33cdbf
SM		 815 hole_len = (loff_t)offset << inode->i_blkbits;
816 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
b3c03fce 817 if (ret < 0)
02d4ca49 818 goto out_free;
31170b6a
JK		 819 c = 0;
820 offset = 0;
821 count += ret;
36ec52ea
JK		 822 /*
823 * Is there any real extent? - otherwise we overwrite the fake
824 * one...
825 */
826 if (count)
827 c = !c;
828 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
829 inode->i_sb->s_blocksize;
830 memset(&laarr[c].extLocation, 0x00,
831 sizeof(struct kernel_lb_addr));
832 count++;
cb00ea35 833 endnum = c + 1;
1da177e4 834 lastblock = 1;
cb00ea35 835 } else {
6981498d 836 isBeyondEOF = false;
1da177e4
LT		 837 endnum = startnum = ((count > 2) ? 2 : count);
838
4b11111a
MS		 839 /* if the current extent is in position 0,
840 swap it with the previous */
cb00ea35 841 if (!c && count != 1) {
31170b6a
JK		 842 laarr[2] = laarr[0];
843 laarr[0] = laarr[1];
844 laarr[1] = laarr[2];
845 c = 1;
846 }
1da177e4 847
4b11111a
MS		 848 /* if the current block is located in an extent,
849 read the next extent */
850 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
851 if (etype != -1) {
cb00ea35
CG		 852 laarr[c + 1].extLength = (etype << 30) | elen;
853 laarr[c + 1].extLocation = eloc;
854 count++;
855 startnum++;
856 endnum++;
4b11111a 857 } else
1da177e4
LT		 858 lastblock = 1;
859 }
1da177e4
LT		 860
861 /* if the current extent is not recorded but allocated, get the
28de7948 862 * block in the extent corresponding to the requested block */
4b11111a 863 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
1da177e4 864 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
4b11111a 865 else { /* otherwise, allocate a new block */
b3c03fce 866 if (iinfo->i_next_alloc_block == map->lblk)
48d6d8ff 867 goal = iinfo->i_next_alloc_goal;
1da177e4 868
cb00ea35 869 if (!goal) {
4b11111a 870 if (!(goal = pgoal)) /* XXX: what was intended here? */
48d6d8ff 871 goal = iinfo->i_location.logicalBlockNum + 1;
1da177e4
LT		 872 }
873
4b11111a 874 newblocknum = udf_new_block(inode->i_sb, inode,
48d6d8ff 875 iinfo->i_location.partitionReferenceNum,
b3c03fce
JK		 876 goal, &ret);
877 if (!newblocknum)
02d4ca49 878 goto out_free;
fb719c59
NJ		 879 if (isBeyondEOF)
880 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
1da177e4
LT		 881 }
882
4b11111a
MS		 883 /* if the extent the requsted block is located in contains multiple
884 * blocks, split the extent into at most three extents. blocks prior
885 * to requested block, requested block, and blocks after requested
886 * block */
1da177e4
LT		 887 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
888
80942521 889 if (!(map->iflags & UDF_MAP_NOPREALLOC))
81056dd0 890 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
1da177e4
LT		 891
892 /* merge any continuous blocks in laarr */
893 udf_merge_extents(inode, laarr, &endnum);
894
895 /* write back the new extents, inserting new extents if the new number
28de7948
CG		 896 * of extents is greater than the old number, and deleting extents if
897 * the new number of extents is less than the old number */
b3c03fce
JK		 898 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
899 if (ret < 0)
19fd80de 900 goto out_free;
1da177e4 901
b3c03fce 902 map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
48d6d8ff 903 iinfo->i_location.partitionReferenceNum, 0);
b3c03fce
JK		 904 if (!map->pblk) {
905 ret = -EFSCORRUPTED;
02d4ca49 906 goto out_free;
7b0b0933 907 }
b3c03fce
JK		 908 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
909 iinfo->i_next_alloc_block = map->lblk + 1;
de80dae0 910 iinfo->i_next_alloc_goal = newblocknum + 1;
59ad88f2 911 inode_set_ctime_current(inode);
1da177e4
LT		 912
913 if (IS_SYNC(inode))
914 udf_sync_inode(inode);
915 else
916 mark_inode_dirty(inode);
b3c03fce 917 ret = 0;
02d4ca49
FF		 918out_free:
919 brelse(prev_epos.bh);
920 brelse(cur_epos.bh);
921 brelse(next_epos.bh);
b3c03fce 922 return ret;
1da177e4
LT		 923}
924
cb00ea35 925static void udf_split_extents(struct inode *inode, int *c, int offset,
b490bdd6
SM		 926 udf_pblk_t newblocknum,
927 struct kernel_long_ad *laarr, int *endnum)
1da177e4 928{
4b11111a
MS		 929 unsigned long blocksize = inode->i_sb->s_blocksize;
930 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
931
1da177e4 932 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
4b11111a
MS		 933 (laarr[*c].extLength >> 30) ==
934 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1da177e4
LT		 935 int curr = *c;
936 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a 937 blocksize - 1) >> blocksize_bits;
1da177e4
LT		 938 int8_t etype = (laarr[curr].extLength >> 30);
939
4b11111a 940 if (blen == 1)
28de7948 941 ;
4b11111a 942 else if (!offset || blen == offset + 1) {
cb00ea35
CG		 943 laarr[curr + 2] = laarr[curr + 1];
944 laarr[curr + 1] = laarr[curr];
945 } else {
946 laarr[curr + 3] = laarr[curr + 1];
947 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
948 }
949
950 if (offset) {
951 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
4b11111a 952 udf_free_blocks(inode->i_sb, inode,
97e961fd 953 &laarr[curr].extLocation,
4b11111a
MS		 954 0, offset);
955 laarr[curr].extLength =
956 EXT_NOT_RECORDED_NOT_ALLOCATED |
957 (offset << blocksize_bits);
1da177e4 958 laarr[curr].extLocation.logicalBlockNum = 0;
4b11111a
MS		 959 laarr[curr].extLocation.
960 partitionReferenceNum = 0;
961 } else
1da177e4 962 laarr[curr].extLength = (etype << 30) |
4b11111a 963 (offset << blocksize_bits);
cb00ea35
CG		 964 curr++;
965 (*c)++;
966 (*endnum)++;
1da177e4 967 }
647bd61a 968
1da177e4
LT		 969 laarr[curr].extLocation.logicalBlockNum = newblocknum;
970 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
971 laarr[curr].extLocation.partitionReferenceNum =
c0b34438 972 UDF_I(inode)->i_location.partitionReferenceNum;
1da177e4 973 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
4b11111a 974 blocksize;
cb00ea35 975 curr++;
1da177e4 976
cb00ea35 977 if (blen != offset + 1) {
1da177e4 978 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
4b11111a
MS		 979 laarr[curr].extLocation.logicalBlockNum +=
980 offset + 1;
28de7948 981 laarr[curr].extLength = (etype << 30) |
4b11111a 982 ((blen - (offset + 1)) << blocksize_bits);
cb00ea35
CG		 983 curr++;
984 (*endnum)++;
1da177e4
LT		 985 }
986 }
987}
988
989static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
3cc6f844 990 struct kernel_long_ad *laarr,
cb00ea35 991 int *endnum)
1da177e4
LT		 992{
993 int start, length = 0, currlength = 0, i;
994
cb00ea35 995 if (*endnum >= (c + 1)) {
1da177e4
LT		 996 if (!lastblock)
997 return;
998 else
999 start = c;
cb00ea35 1000 } else {
4b11111a
MS		 1001 if ((laarr[c + 1].extLength >> 30) ==
1002 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
cb00ea35 1003 start = c + 1;
4b11111a
MS		 1004 length = currlength =
1005 (((laarr[c + 1].extLength &
1006 UDF_EXTENT_LENGTH_MASK) +
1007 inode->i_sb->s_blocksize - 1) >>
1008 inode->i_sb->s_blocksize_bits);
1009 } else
1da177e4
LT		 1010 start = c;
1011 }
1012
cb00ea35
CG		 1013 for (i = start + 1; i <= *endnum; i++) {
1014 if (i == *endnum) {
1da177e4
LT		 1015 if (lastblock)
1016 length += UDF_DEFAULT_PREALLOC_BLOCKS;
4b11111a
MS		 1017 } else if ((laarr[i].extLength >> 30) ==
1018 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1019 length += (((laarr[i].extLength &
1020 UDF_EXTENT_LENGTH_MASK) +
1021 inode->i_sb->s_blocksize - 1) >>
1022 inode->i_sb->s_blocksize_bits);
1023 } else
1da177e4
LT		 1024 break;
1025 }
1026
cb00ea35 1027 if (length) {
1da177e4 1028 int next = laarr[start].extLocation.logicalBlockNum +
28de7948 1029 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a
MS		 1030 inode->i_sb->s_blocksize - 1) >>
1031 inode->i_sb->s_blocksize_bits);
1da177e4 1032 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
4b11111a
MS		 1033 laarr[start].extLocation.partitionReferenceNum,
1034 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1035 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1036 currlength);
28de7948 1037 if (numalloc) {
4b11111a 1038 if (start == (c + 1))
1da177e4 1039 laarr[start].extLength +=
4b11111a
MS		 1040 (numalloc <<
1041 inode->i_sb->s_blocksize_bits);
1042 else {
cb00ea35 1043 memmove(&laarr[c + 2], &laarr[c + 1],
5ca4e4be 1044 sizeof(struct long_ad) * (*endnum - (c + 1)));
cb00ea35
CG		 1045 (*endnum)++;
1046 laarr[c + 1].extLocation.logicalBlockNum = next;
1047 laarr[c + 1].extLocation.partitionReferenceNum =
4b11111a
MS		 1048 laarr[c].extLocation.
1049 partitionReferenceNum;
1050 laarr[c + 1].extLength =
1051 EXT_NOT_RECORDED_ALLOCATED |
1052 (numalloc <<
1053 inode->i_sb->s_blocksize_bits);
cb00ea35 1054 start = c + 1;
1da177e4
LT		 1055 }
1056
cb00ea35 1057 for (i = start + 1; numalloc && i < *endnum; i++) {
4b11111a
MS		 1058 int elen = ((laarr[i].extLength &
1059 UDF_EXTENT_LENGTH_MASK) +
1060 inode->i_sb->s_blocksize - 1) >>
1061 inode->i_sb->s_blocksize_bits;
1da177e4 1062
cb00ea35 1063 if (elen > numalloc) {
1da177e4 1064 laarr[i].extLength -=
4b11111a
MS		 1065 (numalloc <<
1066 inode->i_sb->s_blocksize_bits);
1da177e4 1067 numalloc = 0;
cb00ea35 1068 } else {
1da177e4 1069 numalloc -= elen;
cb00ea35 1070 if (*endnum > (i + 1))
4b11111a
MS		 1071 memmove(&laarr[i],
1072 &laarr[i + 1],
5ca4e4be 1073 sizeof(struct long_ad) *
4b11111a 1074 (*endnum - (i + 1)));
cb00ea35
CG		 1075 i--;
1076 (*endnum)--;
1da177e4
LT		 1077 }
1078 }
c0b34438 1079 UDF_I(inode)->i_lenExtents +=
4b11111a 1080 numalloc << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 1081 }
1082 }
1083}
1084
3cc6f844 1085static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
cb00ea35 1086 int *endnum)
1da177e4
LT		 1087{
1088 int i;
4b11111a
MS		 1089 unsigned long blocksize = inode->i_sb->s_blocksize;
1090 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1da177e4 1091
cb00ea35 1092 for (i = 0; i < (*endnum - 1); i++) {
5ca4e4be
PE		 1093 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1094 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
4b11111a
MS		 1095
1096 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1097 (((li->extLength >> 30) ==
1098 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1099 ((lip1->extLocation.logicalBlockNum -
1100 li->extLocation.logicalBlockNum) ==
1101 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1102 blocksize - 1) >> blocksize_bits)))) {
1103
1104 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
53cafe1d
JK		 1105 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1106 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
4b11111a
MS		 1107 li->extLength = lip1->extLength +
1108 (((li->extLength &
1109 UDF_EXTENT_LENGTH_MASK) +
1110 blocksize - 1) & ~(blocksize - 1));
1111 if (*endnum > (i + 2))
1112 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1113 sizeof(struct long_ad) *
4b11111a
MS		 1114 (*endnum - (i + 2)));
1115 i--;
1116 (*endnum)--;
1da177e4 1117 }
4b11111a
MS		 1118 } else if (((li->extLength >> 30) ==
1119 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1120 ((lip1->extLength >> 30) ==
1121 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
97e961fd 1122 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
4b11111a
MS		 1123 ((li->extLength &
1124 UDF_EXTENT_LENGTH_MASK) +
1125 blocksize - 1) >> blocksize_bits);
1126 li->extLocation.logicalBlockNum = 0;
1127 li->extLocation.partitionReferenceNum = 0;
1128
1129 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1130 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1131 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1132 lip1->extLength = (lip1->extLength -
1133 (li->extLength &
1134 UDF_EXTENT_LENGTH_MASK) +
1135 UDF_EXTENT_LENGTH_MASK) &
1136 ~(blocksize - 1);
1137 li->extLength = (li->extLength &
1138 UDF_EXTENT_FLAG_MASK) +
1139 (UDF_EXTENT_LENGTH_MASK + 1) -
1140 blocksize;
cb00ea35 1141 } else {
4b11111a
MS		 1142 li->extLength = lip1->extLength +
1143 (((li->extLength &
1144 UDF_EXTENT_LENGTH_MASK) +
1145 blocksize - 1) & ~(blocksize - 1));
cb00ea35
CG		 1146 if (*endnum > (i + 2))
1147 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1148 sizeof(struct long_ad) *
4b11111a 1149 (*endnum - (i + 2)));
cb00ea35
CG		 1150 i--;
1151 (*endnum)--;
1da177e4 1152 }
4b11111a
MS		 1153 } else if ((li->extLength >> 30) ==
1154 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1155 udf_free_blocks(inode->i_sb, inode,
97e961fd 1156 &li->extLocation, 0,
4b11111a
MS		 1157 ((li->extLength &
1158 UDF_EXTENT_LENGTH_MASK) +
1159 blocksize - 1) >> blocksize_bits);
1160 li->extLocation.logicalBlockNum = 0;
1161 li->extLocation.partitionReferenceNum = 0;
1162 li->extLength = (li->extLength &
1163 UDF_EXTENT_LENGTH_MASK) |
1164 EXT_NOT_RECORDED_NOT_ALLOCATED;
1da177e4
LT		 1165 }
1166 }
1167}
1168
19fd80de
JK		 1169static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1170 int startnum, int endnum,
1171 struct extent_position *epos)
1da177e4
LT		 1172{
1173 int start = 0, i;
5ca4e4be 1174 struct kernel_lb_addr tmploc;
1da177e4 1175 uint32_t tmplen;
19fd80de 1176 int err;
1da177e4 1177
cb00ea35
CG		 1178 if (startnum > endnum) {
1179 for (i = 0; i < (startnum - endnum); i++)
6c1e4d06 1180 udf_delete_aext(inode, *epos);
cb00ea35
CG		 1181 } else if (startnum < endnum) {
1182 for (i = 0; i < (endnum - startnum); i++) {
19fd80de
JK		 1183 err = udf_insert_aext(inode, *epos,
1184 laarr[i].extLocation,
1185 laarr[i].extLength);
1186 /*
1187 * If we fail here, we are likely corrupting the extent
1188 * list and leaking blocks. At least stop early to
1189 * limit the damage.
1190 */
1191 if (err < 0)
1192 return err;
ff116fc8 1193 udf_next_aext(inode, epos, &laarr[i].extLocation,
cb00ea35
CG		 1194 &laarr[i].extLength, 1);
1195 start++;
1da177e4
LT		 1196 }
1197 }
1198
cb00ea35 1199 for (i = start; i < endnum; i++) {
ff116fc8 1200 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
97e961fd 1201 udf_write_aext(inode, epos, &laarr[i].extLocation,
cb00ea35 1202 laarr[i].extLength, 1);
1da177e4 1203 }
19fd80de 1204 return 0;
1da177e4
LT		 1205}
1206
b490bdd6 1207struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
cb00ea35 1208 int create, int *err)
1da177e4 1209{
cb00ea35 1210 struct buffer_head *bh = NULL;
32f123a3
JK		 1211 struct udf_map_rq map = {
1212 .lblk = block,
1213 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1214 };
1da177e4 1215
32f123a3
JK		 1216 *err = udf_map_block(inode, &map);
1217 if (*err || !(map.oflags & UDF_BLK_MAPPED))
1218 return NULL;
1219
1220 bh = sb_getblk(inode->i_sb, map.pblk);
1221 if (!bh) {
1222 *err = -ENOMEM;
1da177e4 1223 return NULL;
32f123a3
JK		 1224 }
1225 if (map.oflags & UDF_BLK_NEW) {
1226 lock_buffer(bh);
1227 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1228 set_buffer_uptodate(bh);
1229 unlock_buffer(bh);
1230 mark_buffer_dirty_inode(bh, inode);
1231 return bh;
1232 }
1da177e4 1233
59a16786 1234 if (bh_read(bh, 0) >= 0)
1da177e4 1235 return bh;
28de7948 1236
1da177e4
LT		 1237 brelse(bh);
1238 *err = -EIO;
1239 return NULL;
1240}
1241
7e49b6f2 1242int udf_setsize(struct inode *inode, loff_t newsize)
1da177e4 1243{
b9a861fd 1244 int err = 0;
48d6d8ff 1245 struct udf_inode_info *iinfo;
89a4d970 1246 unsigned int bsize = i_blocksize(inode);
1da177e4
LT		 1247
1248 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
cb00ea35 1249 S_ISLNK(inode->i_mode)))
7e49b6f2 1250 return -EINVAL;
1da177e4 1251 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
7e49b6f2 1252 return -EPERM;
1da177e4 1253
b9a861fd 1254 filemap_invalidate_lock(inode->i_mapping);
48d6d8ff 1255 iinfo = UDF_I(inode);
7e49b6f2 1256 if (newsize > inode->i_size) {
7e49b6f2 1257 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
6a3b37e0 1258 if (bsize >=
7e49b6f2 1259 (udf_file_entry_alloc_offset(inode) + newsize)) {
d2eb8c35 1260 down_write(&iinfo->i_data_sem);
7e49b6f2 1261 iinfo->i_lenAlloc = newsize;
2d532616 1262 up_write(&iinfo->i_data_sem);
bb2b6d19
IA		 1263 goto set_size;
1264 }
6a3b37e0
JK		 1265 err = udf_expand_file_adinicb(inode);
1266 if (err)
b9a861fd 1267 goto out_unlock;
7e49b6f2
JK		 1268 }
1269 err = udf_extend_file(inode, newsize);
2d532616 1270 if (err)
b9a861fd 1271 goto out_unlock;
bb2b6d19 1272set_size:
f2e95355 1273 truncate_setsize(inode, newsize);
cb00ea35 1274 } else {
7e49b6f2
JK		 1275 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1276 down_write(&iinfo->i_data_sem);
99600051 1277 udf_clear_extent_cache(inode);
382a2287 1278 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
7e49b6f2
JK		 1279 0x00, bsize - newsize -
1280 udf_file_entry_alloc_offset(inode));
1281 iinfo->i_lenAlloc = newsize;
1282 truncate_setsize(inode, newsize);
1283 up_write(&iinfo->i_data_sem);
1284 goto update_time;
1285 }
1286 err = block_truncate_page(inode->i_mapping, newsize,
1287 udf_get_block);
1288 if (err)
b9a861fd 1289 goto out_unlock;
f2e95355 1290 truncate_setsize(inode, newsize);
4d0fb621 1291 down_write(&iinfo->i_data_sem);
99600051 1292 udf_clear_extent_cache(inode);
2b42be5e 1293 err = udf_truncate_extents(inode);
4d0fb621 1294 up_write(&iinfo->i_data_sem);
2b42be5e 1295 if (err)
b9a861fd 1296 goto out_unlock;
647bd61a 1297 }
7e49b6f2 1298update_time:
f972fed7 1299 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1da177e4 1300 if (IS_SYNC(inode))
cb00ea35 1301 udf_sync_inode(inode);
1da177e4
LT		 1302 else
1303 mark_inode_dirty(inode);
b9a861fd
JK		 1304out_unlock:
1305 filemap_invalidate_unlock(inode->i_mapping);
1306 return err;
1da177e4
LT		 1307}
1308
c03aa9f6
JK		 1309/*
1310 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1311 * arbitrary - just that we hopefully don't limit any real use of rewritten
1312 * inode on write-once media but avoid looping for too long on corrupted media.
1313 */
1314#define UDF_MAX_ICB_NESTING 1024
1315
6174c2eb 1316static int udf_read_inode(struct inode *inode, bool hidden_inode)
1da177e4
LT		 1317{
1318 struct buffer_head *bh = NULL;
1319 struct fileEntry *fe;
bb7720a0 1320 struct extendedFileEntry *efe;
1da177e4 1321 uint16_t ident;
48d6d8ff 1322 struct udf_inode_info *iinfo = UDF_I(inode);
bb7720a0 1323 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
6d3d5e86 1324 struct kernel_lb_addr *iloc = &iinfo->i_location;
bb7720a0 1325 unsigned int link_count;
c03aa9f6 1326 unsigned int indirections = 0;
79144954 1327 int bs = inode->i_sb->s_blocksize;
6d3d5e86 1328 int ret = -EIO;
0c9850f4 1329 uint32_t uid, gid;
f972fed7 1330 struct timespec64 ts;
1da177e4 1331
c03aa9f6 1332reread:
1d82a56b 1333 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
fcbf7637 1334 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1d82a56b
FF		 1335 iloc->partitionReferenceNum, sbi->s_partitions);
1336 return -EIO;
1337 }
1338
6d3d5e86
JK		 1339 if (iloc->logicalBlockNum >=
1340 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
fcbf7637 1341 udf_debug("block=%u, partition=%u out of range\n",
6d3d5e86
JK		 1342 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1343 return -EIO;
1344 }
1345
1da177e4
LT		 1346 /*
1347 * Set defaults, but the inode is still incomplete!
1348 * Note: get_new_inode() sets the following on a new inode:
1349 * i_sb = sb
1350 * i_no = ino
1351 * i_flags = sb->s_flags
1352 * i_state = 0
1353 * clean_inode(): zero fills and sets
1354 * i_count = 1
1355 * i_nlink = 1
1356 * i_op = NULL;
1357 */
6d3d5e86 1358 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
cb00ea35 1359 if (!bh) {
fcbf7637 1360 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
6d3d5e86 1361 return -EIO;
1da177e4
LT		 1362 }
1363
1364 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
cb00ea35 1365 ident != TAG_IDENT_USE) {
fcbf7637 1366 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
78ace70c 1367 inode->i_ino, ident);
6d3d5e86 1368 goto out;
1da177e4
LT		 1369 }
1370
1371 fe = (struct fileEntry *)bh->b_data;
bb7720a0 1372 efe = (struct extendedFileEntry *)bh->b_data;
1da177e4 1373
5e0f0017 1374 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1ab92785 1375 struct buffer_head *ibh;
1da177e4 1376
6d3d5e86 1377 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1ab92785 1378 if (ident == TAG_IDENT_IE && ibh) {
5ca4e4be 1379 struct kernel_lb_addr loc;
1ab92785 1380 struct indirectEntry *ie;
1381
1382 ie = (struct indirectEntry *)ibh->b_data;
1383 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1384
c03aa9f6 1385 if (ie->indirectICB.extLength) {
c03aa9f6
JK		 1386 brelse(ibh);
1387 memcpy(&iinfo->i_location, &loc,
1388 sizeof(struct kernel_lb_addr));
1389 if (++indirections > UDF_MAX_ICB_NESTING) {
1390 udf_err(inode->i_sb,
1391 "too many ICBs in ICB hierarchy"
1392 " (max %d supported)\n",
1393 UDF_MAX_ICB_NESTING);
6d3d5e86 1394 goto out;
28de7948 1395 }
6d3d5e86 1396 brelse(bh);
c03aa9f6 1397 goto reread;
1da177e4 1398 }
28de7948 1399 }
1ab92785 1400 brelse(ibh);
5e0f0017 1401 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
fcbf7637 1402 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
78ace70c 1403 le16_to_cpu(fe->icbTag.strategyType));
6d3d5e86 1404 goto out;
1da177e4 1405 }
5e0f0017 1406 if (fe->icbTag.strategyType == cpu_to_le16(4))
48d6d8ff 1407 iinfo->i_strat4096 = 0;
5e0f0017 1408 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
48d6d8ff 1409 iinfo->i_strat4096 = 1;
1da177e4 1410
48d6d8ff 1411 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
4b11111a 1412 ICBTAG_FLAG_AD_MASK;
d288d958
JK		 1413 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1414 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1415 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1416 ret = -EIO;
1417 goto out;
1418 }
fc8033a3 1419 iinfo->i_hidden = hidden_inode;
48d6d8ff
MS		 1420 iinfo->i_unique = 0;
1421 iinfo->i_lenEAttr = 0;
1422 iinfo->i_lenExtents = 0;
1423 iinfo->i_lenAlloc = 0;
1424 iinfo->i_next_alloc_block = 0;
1425 iinfo->i_next_alloc_goal = 0;
5e0f0017 1426 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
48d6d8ff
MS		 1427 iinfo->i_efe = 1;
1428 iinfo->i_use = 0;
79144954 1429 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1430 sizeof(struct extendedFileEntry));
1431 if (ret)
1432 goto out;
382a2287 1433 memcpy(iinfo->i_data,
4b11111a 1434 bh->b_data + sizeof(struct extendedFileEntry),
79144954 1435 bs - sizeof(struct extendedFileEntry));
5e0f0017 1436 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
48d6d8ff
MS		 1437 iinfo->i_efe = 0;
1438 iinfo->i_use = 0;
79144954 1439 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
6d3d5e86
JK		 1440 if (ret)
1441 goto out;
382a2287 1442 memcpy(iinfo->i_data,
c0b34438 1443 bh->b_data + sizeof(struct fileEntry),
79144954 1444 bs - sizeof(struct fileEntry));
5e0f0017 1445 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
48d6d8ff
MS		 1446 iinfo->i_efe = 0;
1447 iinfo->i_use = 1;
1448 iinfo->i_lenAlloc = le32_to_cpu(
4b11111a
MS		 1449 ((struct unallocSpaceEntry *)bh->b_data)->
1450 lengthAllocDescs);
79144954 1451 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1452 sizeof(struct unallocSpaceEntry));
1453 if (ret)
1454 goto out;
382a2287 1455 memcpy(iinfo->i_data,
4b11111a 1456 bh->b_data + sizeof(struct unallocSpaceEntry),
79144954 1457 bs - sizeof(struct unallocSpaceEntry));
6d3d5e86 1458 return 0;
1da177e4
LT		 1459 }
1460
6d3d5e86 1461 ret = -EIO;
c03cad24 1462 read_lock(&sbi->s_cred_lock);
0c9850f4
JK		 1463 uid = le32_to_cpu(fe->uid);
1464 if (uid == UDF_INVALID_ID ||
ca76d2d8 1465 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
0c9850f4
JK		 1466 inode->i_uid = sbi->s_uid;
1467 else
1468 i_uid_write(inode, uid);
1da177e4 1469
0c9850f4
JK		 1470 gid = le32_to_cpu(fe->gid);
1471 if (gid == UDF_INVALID_ID ||
ca76d2d8 1472 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
0c9850f4
JK		 1473 inode->i_gid = sbi->s_gid;
1474 else
1475 i_gid_write(inode, gid);
1da177e4 1476
7ac9bcd5 1477 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1478 sbi->s_fmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1479 inode->i_mode = sbi->s_fmode;
1480 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1481 sbi->s_dmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1482 inode->i_mode = sbi->s_dmode;
1483 else
1484 inode->i_mode = udf_convert_permissions(fe);
1485 inode->i_mode &= ~sbi->s_umask;
c3367a1b
SM		 1486 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1487
c03cad24
JK		 1488 read_unlock(&sbi->s_cred_lock);
1489
bfe86848 1490 link_count = le16_to_cpu(fe->fileLinkCount);
4071b913 1491 if (!link_count) {
6174c2eb
JK		 1492 if (!hidden_inode) {
1493 ret = -ESTALE;
1494 goto out;
1495 }
1496 link_count = 1;
4071b913 1497 }
bfe86848 1498 set_nlink(inode, link_count);
c03cad24
JK		 1499
1500 inode->i_size = le64_to_cpu(fe->informationLength);
1501 iinfo->i_lenExtents = inode->i_size;
1da177e4 1502
48d6d8ff 1503 if (iinfo->i_efe == 0) {
1da177e4 1504 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
28de7948 1505 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1506
f972fed7
JL		 1507 udf_disk_stamp_to_time(&ts, fe->accessTime);
1508 inode_set_atime_to_ts(inode, ts);
1509 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1510 inode_set_mtime_to_ts(inode, ts);
1511 udf_disk_stamp_to_time(&ts, fe->attrTime);
1512 inode_set_ctime_to_ts(inode, ts);
1da177e4 1513
48d6d8ff
MS		 1514 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1515 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1516 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
d5e2cf07 1517 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
ab9a3a73
SM		 1518 iinfo->i_streamdir = 0;
1519 iinfo->i_lenStreams = 0;
cb00ea35 1520 } else {
647bd61a 1521 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
cb00ea35 1522 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1523
f972fed7
JL		 1524 udf_disk_stamp_to_time(&ts, efe->accessTime);
1525 inode_set_atime_to_ts(inode, ts);
1526 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1527 inode_set_mtime_to_ts(inode, ts);
1528 udf_disk_stamp_to_time(&ts, efe->attrTime);
1529 inode_set_ctime_to_ts(inode, ts);
0220edda 1530 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1da177e4 1531
48d6d8ff
MS		 1532 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1533 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1534 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
d5e2cf07 1535 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
ab9a3a73
SM		 1536
1537 /* Named streams */
1538 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1539 iinfo->i_locStreamdir =
1540 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1541 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1542 if (iinfo->i_lenStreams >= inode->i_size)
1543 iinfo->i_lenStreams -= inode->i_size;
1544 else
1545 iinfo->i_lenStreams = 0;
1da177e4 1546 }
470cca56 1547 inode->i_generation = iinfo->i_unique;
1da177e4 1548
23b133bd
JK		 1549 /*
1550 * Sanity check length of allocation descriptors and extended attrs to
1551 * avoid integer overflows
1552 */
1553 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1554 goto out;
1555 /* Now do exact checks */
1556 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1557 goto out;
e159332b
JK		 1558 /* Sanity checks for files in ICB so that we don't get confused later */
1559 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1560 /*
1561 * For file in ICB data is stored in allocation descriptor
1562 * so sizes should match
1563 */
1564 if (iinfo->i_lenAlloc != inode->i_size)
1565 goto out;
1566 /* File in ICB has to fit in there... */
79144954 1567 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
e159332b
JK		 1568 goto out;
1569 }
1570
cb00ea35
CG		 1571 switch (fe->icbTag.fileType) {
1572 case ICBTAG_FILE_TYPE_DIRECTORY:
28de7948
CG		 1573 inode->i_op = &udf_dir_inode_operations;
1574 inode->i_fop = &udf_dir_operations;
1575 inode->i_mode |= S_IFDIR;
1576 inc_nlink(inode);
1577 break;
cb00ea35
CG		 1578 case ICBTAG_FILE_TYPE_REALTIME:
1579 case ICBTAG_FILE_TYPE_REGULAR:
1580 case ICBTAG_FILE_TYPE_UNDEF:
742e1795 1581 case ICBTAG_FILE_TYPE_VAT20:
37a8a39f 1582 inode->i_data.a_ops = &udf_aops;
28de7948
CG		 1583 inode->i_op = &udf_file_inode_operations;
1584 inode->i_fop = &udf_file_operations;
1585 inode->i_mode |= S_IFREG;
1586 break;
cb00ea35 1587 case ICBTAG_FILE_TYPE_BLOCK:
28de7948
CG		 1588 inode->i_mode |= S_IFBLK;
1589 break;
cb00ea35 1590 case ICBTAG_FILE_TYPE_CHAR:
28de7948
CG		 1591 inode->i_mode |= S_IFCHR;
1592 break;
cb00ea35 1593 case ICBTAG_FILE_TYPE_FIFO:
28de7948
CG		 1594 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1595 break;
cb00ea35 1596 case ICBTAG_FILE_TYPE_SOCKET:
28de7948
CG		 1597 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1598 break;
cb00ea35 1599 case ICBTAG_FILE_TYPE_SYMLINK:
28de7948 1600 inode->i_data.a_ops = &udf_symlink_aops;
ad4d0532 1601 inode->i_op = &udf_symlink_inode_operations;
21fc61c7 1602 inode_nohighmem(inode);
6ff6b2b3 1603 inode->i_mode = S_IFLNK | 0777;
28de7948 1604 break;
bfb257a5
JK		 1605 case ICBTAG_FILE_TYPE_MAIN:
1606 udf_debug("METADATA FILE-----\n");
1607 break;
1608 case ICBTAG_FILE_TYPE_MIRROR:
1609 udf_debug("METADATA MIRROR FILE-----\n");
1610 break;
1611 case ICBTAG_FILE_TYPE_BITMAP:
1612 udf_debug("METADATA BITMAP FILE-----\n");
1613 break;
cb00ea35 1614 default:
fcbf7637 1615 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
78ace70c 1616 inode->i_ino, fe->icbTag.fileType);
6d3d5e86 1617 goto out;
1da177e4 1618 }
cb00ea35 1619 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
4b11111a
MS		 1620 struct deviceSpec *dsea =
1621 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35
CG		 1622 if (dsea) {
1623 init_special_inode(inode, inode->i_mode,
4b11111a
MS		 1624 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1625 le32_to_cpu(dsea->minorDeviceIdent)));
1da177e4 1626 /* Developer ID ??? */
4b11111a 1627 } else
6d3d5e86 1628 goto out;
1da177e4 1629 }
6d3d5e86
JK		 1630 ret = 0;
1631out:
bb7720a0 1632 brelse(bh);
6d3d5e86 1633 return ret;
1da177e4
LT		 1634}
1635
647bd61a
CG		 1636static int udf_alloc_i_data(struct inode *inode, size_t size)
1637{
48d6d8ff 1638 struct udf_inode_info *iinfo = UDF_I(inode);
382a2287
JK		 1639 iinfo->i_data = kmalloc(size, GFP_KERNEL);
1640 if (!iinfo->i_data)
647bd61a 1641 return -ENOMEM;
647bd61a
CG		 1642 return 0;
1643}
1644
faa17292 1645static umode_t udf_convert_permissions(struct fileEntry *fe)
1da177e4 1646{
faa17292 1647 umode_t mode;
1da177e4
LT		 1648 uint32_t permissions;
1649 uint32_t flags;
1650
1651 permissions = le32_to_cpu(fe->permissions);
1652 flags = le16_to_cpu(fe->icbTag.flags);
1653
6ff6b2b3
FF		 1654 mode = ((permissions) & 0007) |
1655 ((permissions >> 2) & 0070) |
1656 ((permissions >> 4) & 0700) |
4b11111a
MS		 1657 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1658 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1659 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1da177e4
LT		 1660
1661 return mode;
1662}
1663
c3367a1b
SM		 1664void udf_update_extra_perms(struct inode *inode, umode_t mode)
1665{
1666 struct udf_inode_info *iinfo = UDF_I(inode);
1667
1668 /*
1669 * UDF 2.01 sec. 3.3.3.3 Note 2:
1670 * In Unix, delete permission tracks write
1671 */
1672 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1673 if (mode & 0200)
1674 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1675 if (mode & 0020)
1676 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1677 if (mode & 0002)
1678 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1679}
1680
a9185b41 1681int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4 1682{
49521de1 1683 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1da177e4
LT		 1684}
1685
49521de1 1686static int udf_sync_inode(struct inode *inode)
1da177e4
LT		 1687{
1688 return udf_update_inode(inode, 1);
1689}
1690
c3b9cecd 1691static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
7ed0fbd7
FF		 1692{
1693 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1694 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1695 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1696 iinfo->i_crtime = time;
1697}
1698
cb00ea35 1699static int udf_update_inode(struct inode *inode, int do_sync)
1da177e4
LT		 1700{
1701 struct buffer_head *bh = NULL;
1702 struct fileEntry *fe;
1703 struct extendedFileEntry *efe;
b2527bfa 1704 uint64_t lb_recorded;
1da177e4
LT		 1705 uint32_t udfperms;
1706 uint16_t icbflags;
1707 uint16_t crclen;
1da177e4 1708 int err = 0;
6c79e987 1709 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
4b11111a 1710 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
48d6d8ff 1711 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 1712
101ee137 1713 bh = sb_getblk(inode->i_sb,
5833ded9 1714 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
cb00ea35 1715 if (!bh) {
aae917cd 1716 udf_debug("getblk failure\n");
0fd2ba36 1717 return -EIO;
1da177e4
LT		 1718 }
1719
aae917cd
JK		 1720 lock_buffer(bh);
1721 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1da177e4
LT		 1722 fe = (struct fileEntry *)bh->b_data;
1723 efe = (struct extendedFileEntry *)bh->b_data;
1724
aae917cd 1725 if (iinfo->i_use) {
1da177e4 1726 struct unallocSpaceEntry *use =
28de7948 1727 (struct unallocSpaceEntry *)bh->b_data;
1da177e4 1728
48d6d8ff 1729 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
4b11111a 1730 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
382a2287 1731 iinfo->i_data, inode->i_sb->s_blocksize -
4b11111a 1732 sizeof(struct unallocSpaceEntry));
aae917cd 1733 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
70f19f58 1734 crclen = sizeof(struct unallocSpaceEntry);
1da177e4 1735
70f19f58 1736 goto finish;
1da177e4
LT		 1737 }
1738
4d6660eb 1739 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
0c9850f4 1740 fe->uid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1741 else
c2ba138a 1742 fe->uid = cpu_to_le32(i_uid_read(inode));
1da177e4 1743
4d6660eb 1744 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
0c9850f4 1745 fe->gid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1746 else
c2ba138a 1747 fe->gid = cpu_to_le32(i_gid_read(inode));
1da177e4 1748
6ff6b2b3
FF		 1749 udfperms = ((inode->i_mode & 0007)) |
1750 ((inode->i_mode & 0070) << 2) |
1751 ((inode->i_mode & 0700) << 4);
1da177e4 1752
c3367a1b 1753 udfperms |= iinfo->i_extraPerms;
1da177e4
LT		 1754 fe->permissions = cpu_to_le32(udfperms);
1755
8a70ee33 1756 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1da177e4 1757 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
fc8033a3
JK		 1758 else {
1759 if (iinfo->i_hidden)
1760 fe->fileLinkCount = cpu_to_le16(0);
1761 else
1762 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1763 }
1da177e4
LT		 1764
1765 fe->informationLength = cpu_to_le64(inode->i_size);
1766
cb00ea35 1767 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
5ca4e4be 1768 struct regid *eid;
28de7948
CG		 1769 struct deviceSpec *dsea =
1770 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35 1771 if (!dsea) {
1da177e4 1772 dsea = (struct deviceSpec *)
28de7948
CG		 1773 udf_add_extendedattr(inode,
1774 sizeof(struct deviceSpec) +
5ca4e4be 1775 sizeof(struct regid), 12, 0x3);
1da177e4
LT		 1776 dsea->attrType = cpu_to_le32(12);
1777 dsea->attrSubtype = 1;
4b11111a
MS		 1778 dsea->attrLength = cpu_to_le32(
1779 sizeof(struct deviceSpec) +
5ca4e4be
PE		 1780 sizeof(struct regid));
1781 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1da177e4 1782 }
5ca4e4be 1783 eid = (struct regid *)dsea->impUse;
033c9da0 1784 memset(eid, 0, sizeof(*eid));
1da177e4
LT		 1785 strcpy(eid->ident, UDF_ID_DEVELOPER);
1786 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1787 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1788 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1789 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1790 }
1791
b2527bfa
SN		 1792 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1793 lb_recorded = 0; /* No extents => no blocks! */
1794 else
1795 lb_recorded =
1796 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1797 (blocksize_bits - 9);
1798
48d6d8ff 1799 if (iinfo->i_efe == 0) {
c0b34438 1800 memcpy(bh->b_data + sizeof(struct fileEntry),
382a2287 1801 iinfo->i_data,
cb00ea35 1802 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
b2527bfa 1803 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1804
f972fed7
JL		 1805 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1806 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
59ad88f2 1807 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
5ca4e4be 1808 memset(&(fe->impIdent), 0, sizeof(struct regid));
1da177e4
LT		 1809 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1810 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1811 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1812 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1813 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1814 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1815 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1816 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1817 crclen = sizeof(struct fileEntry);
cb00ea35 1818 } else {
4b11111a 1819 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
382a2287 1820 iinfo->i_data,
4b11111a
MS		 1821 inode->i_sb->s_blocksize -
1822 sizeof(struct extendedFileEntry));
ab9a3a73
SM		 1823 efe->objectSize =
1824 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
b2527bfa 1825 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1826
ab9a3a73
SM		 1827 if (iinfo->i_streamdir) {
1828 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1829
1830 icb_lad->extLocation =
1831 cpu_to_lelb(iinfo->i_locStreamdir);
1832 icb_lad->extLength =
1833 cpu_to_le32(inode->i_sb->s_blocksize);
1834 }
1835
f972fed7
JL		 1836 udf_adjust_time(iinfo, inode_get_atime(inode));
1837 udf_adjust_time(iinfo, inode_get_mtime(inode));
59ad88f2 1838 udf_adjust_time(iinfo, inode_get_ctime(inode));
1da177e4 1839
f972fed7
JL		 1840 udf_time_to_disk_stamp(&efe->accessTime,
1841 inode_get_atime(inode));
1842 udf_time_to_disk_stamp(&efe->modificationTime,
1843 inode_get_mtime(inode));
56774805 1844 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
59ad88f2 1845 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1da177e4 1846
033c9da0 1847 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1da177e4
LT		 1848 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1849 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1850 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1851 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1852 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1853 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1854 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1855 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1856 crclen = sizeof(struct extendedFileEntry);
1857 }
70f19f58
SM		 1858
1859finish:
48d6d8ff 1860 if (iinfo->i_strat4096) {
1da177e4
LT		 1861 fe->icbTag.strategyType = cpu_to_le16(4096);
1862 fe->icbTag.strategyParameter = cpu_to_le16(1);
1863 fe->icbTag.numEntries = cpu_to_le16(2);
cb00ea35 1864 } else {
1da177e4
LT		 1865 fe->icbTag.strategyType = cpu_to_le16(4);
1866 fe->icbTag.numEntries = cpu_to_le16(1);
1867 }
1868
70f19f58
SM		 1869 if (iinfo->i_use)
1870 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1871 else if (S_ISDIR(inode->i_mode))
1da177e4
LT		 1872 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1873 else if (S_ISREG(inode->i_mode))
1874 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1875 else if (S_ISLNK(inode->i_mode))
1876 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1877 else if (S_ISBLK(inode->i_mode))
1878 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1879 else if (S_ISCHR(inode->i_mode))
1880 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1881 else if (S_ISFIFO(inode->i_mode))
1882 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1883 else if (S_ISSOCK(inode->i_mode))
1884 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1885
48d6d8ff 1886 icbflags = iinfo->i_alloc_type |
28de7948
CG		 1887 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1888 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1889 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1890 (le16_to_cpu(fe->icbTag.flags) &
1891 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1892 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1da177e4
LT		 1893
1894 fe->icbTag.flags = cpu_to_le16(icbflags);
6c79e987 1895 if (sbi->s_udfrev >= 0x0200)
1da177e4
LT		 1896 fe->descTag.descVersion = cpu_to_le16(3);
1897 else
1898 fe->descTag.descVersion = cpu_to_le16(2);
6c79e987 1899 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
4b11111a 1900 fe->descTag.tagLocation = cpu_to_le32(
48d6d8ff 1901 iinfo->i_location.logicalBlockNum);
aae917cd 1902 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1da177e4 1903 fe->descTag.descCRCLength = cpu_to_le16(crclen);
5ca4e4be 1904 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
f845fced 1905 crclen));
3f2587bb 1906 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1da177e4 1907
5833ded9 1908 set_buffer_uptodate(bh);
aae917cd
JK		 1909 unlock_buffer(bh);
1910
1da177e4
LT		 1911 /* write the data blocks */
1912 mark_buffer_dirty(bh);
cb00ea35 1913 if (do_sync) {
1da177e4 1914 sync_dirty_buffer(bh);
aae917cd 1915 if (buffer_write_io_error(bh)) {
78ace70c
JP		 1916 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1917 inode->i_ino);
1da177e4
LT		 1918 err = -EIO;
1919 }
1920 }
3bf25cb4 1921 brelse(bh);
28de7948 1922
1da177e4
LT		 1923 return err;
1924}
1925
6174c2eb
JK		 1926struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1927 bool hidden_inode)
1da177e4
LT		 1928{
1929 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1930 struct inode *inode = iget_locked(sb, block);
6d3d5e86 1931 int err;
1da177e4
LT		 1932
1933 if (!inode)
6d3d5e86 1934 return ERR_PTR(-ENOMEM);
1da177e4 1935
85a37983
JK		 1936 if (!(inode->i_state & I_NEW)) {
1937 if (UDF_I(inode)->i_hidden != hidden_inode) {
1938 iput(inode);
1939 return ERR_PTR(-EFSCORRUPTED);
1940 }
6d3d5e86 1941 return inode;
85a37983 1942 }
1da177e4 1943
6d3d5e86 1944 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
6174c2eb 1945 err = udf_read_inode(inode, hidden_inode);
6d3d5e86
JK		 1946 if (err < 0) {
1947 iget_failed(inode);
1948 return ERR_PTR(err);
1da177e4 1949 }
6d3d5e86 1950 unlock_new_inode(inode);
1da177e4
LT		 1951
1952 return inode;
1da177e4
LT		 1953}
1954
b490bdd6 1955int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
fcea62ba 1956 struct extent_position *epos)
1da177e4 1957{
fcea62ba
JK		 1958 struct super_block *sb = inode->i_sb;
1959 struct buffer_head *bh;
1da177e4 1960 struct allocExtDesc *aed;
fcea62ba
JK		 1961 struct extent_position nepos;
1962 struct kernel_lb_addr neloc;
1963 int ver, adsize;
1da177e4 1964
fcea62ba
JK		 1965 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1966 adsize = sizeof(struct short_ad);
1967 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1968 adsize = sizeof(struct long_ad);
1da177e4 1969 else
4f1b1519 1970 return -EIO;
fcea62ba
JK		 1971
1972 neloc.logicalBlockNum = block;
1973 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1974
101ee137 1975 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
fcea62ba
JK		 1976 if (!bh)
1977 return -EIO;
1978 lock_buffer(bh);
1979 memset(bh->b_data, 0x00, sb->s_blocksize);
1980 set_buffer_uptodate(bh);
1981 unlock_buffer(bh);
1982 mark_buffer_dirty_inode(bh, inode);
1983
1984 aed = (struct allocExtDesc *)(bh->b_data);
1985 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1986 aed->previousAllocExtLocation =
1987 cpu_to_le32(epos->block.logicalBlockNum);
1988 }
1989 aed->lengthAllocDescs = cpu_to_le32(0);
1990 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1991 ver = 3;
1da177e4 1992 else
fcea62ba
JK		 1993 ver = 2;
1994 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1995 sizeof(struct tag));
1996
1997 nepos.block = neloc;
1998 nepos.offset = sizeof(struct allocExtDesc);
1999 nepos.bh = bh;
2000
2001 /*
2002 * Do we have to copy current last extent to make space for indirect
2003 * one?
2004 */
2005 if (epos->offset + adsize > sb->s_blocksize) {
2006 struct kernel_lb_addr cp_loc;
2007 uint32_t cp_len;
2008 int cp_type;
2009
2010 epos->offset -= adsize;
2011 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2012 cp_len |= ((uint32_t)cp_type) << 30;
2013
2014 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2015 udf_write_aext(inode, epos, &nepos.block,
800552ce 2016 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 2017 } else {
2018 __udf_add_aext(inode, epos, &nepos.block,
800552ce 2019 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 2020 }
2021
2022 brelse(epos->bh);
2023 *epos = nepos;
2024
2025 return 0;
2026}
2027
2028/*
2029 * Append extent at the given position - should be the first free one in inode
2030 * / indirect extent. This function assumes there is enough space in the inode
2031 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2032 */
2033int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2034 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2035{
2036 struct udf_inode_info *iinfo = UDF_I(inode);
2037 struct allocExtDesc *aed;
2038 int adsize;
1da177e4 2039
48d6d8ff 2040 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2041 adsize = sizeof(struct short_ad);
48d6d8ff 2042 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2043 adsize = sizeof(struct long_ad);
1da177e4 2044 else
7e49b6f2 2045 return -EIO;
1da177e4 2046
fcea62ba
JK		 2047 if (!epos->bh) {
2048 WARN_ON(iinfo->i_lenAlloc !=
2049 epos->offset - udf_file_entry_alloc_offset(inode));
2050 } else {
2051 aed = (struct allocExtDesc *)epos->bh->b_data;
2052 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2053 epos->offset - sizeof(struct allocExtDesc));
2054 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1da177e4
LT		 2055 }
2056
7e49b6f2 2057 udf_write_aext(inode, epos, eloc, elen, inc);
1da177e4 2058
cb00ea35 2059 if (!epos->bh) {
48d6d8ff 2060 iinfo->i_lenAlloc += adsize;
1da177e4 2061 mark_inode_dirty(inode);
cb00ea35 2062 } else {
ff116fc8 2063 aed = (struct allocExtDesc *)epos->bh->b_data;
c2104fda 2064 le32_add_cpu(&aed->lengthAllocDescs, adsize);
4b11111a
MS		 2065 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2066 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2067 udf_update_tag(epos->bh->b_data,
2068 epos->offset + (inc ? 0 : adsize));
1da177e4 2069 else
4b11111a
MS		 2070 udf_update_tag(epos->bh->b_data,
2071 sizeof(struct allocExtDesc));
ff116fc8 2072 mark_buffer_dirty_inode(epos->bh, inode);
1da177e4
LT		 2073 }
2074
7e49b6f2 2075 return 0;
1da177e4
LT		 2076}
2077
fcea62ba
JK		 2078/*
2079 * Append extent at given position - should be the first free one in inode
2080 * / indirect extent. Takes care of allocating and linking indirect blocks.
2081 */
2082int udf_add_aext(struct inode *inode, struct extent_position *epos,
2083 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2084{
2085 int adsize;
2086 struct super_block *sb = inode->i_sb;
2087
2088 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2089 adsize = sizeof(struct short_ad);
2090 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2091 adsize = sizeof(struct long_ad);
2092 else
2093 return -EIO;
2094
2095 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2096 int err;
b490bdd6 2097 udf_pblk_t new_block;
fcea62ba
JK		 2098
2099 new_block = udf_new_block(sb, NULL,
2100 epos->block.partitionReferenceNum,
2101 epos->block.logicalBlockNum, &err);
2102 if (!new_block)
2103 return -ENOSPC;
2104
2105 err = udf_setup_indirect_aext(inode, new_block, epos);
2106 if (err)
2107 return err;
2108 }
2109
2110 return __udf_add_aext(inode, epos, eloc, elen, inc);
2111}
2112
7e49b6f2
JK		 2113void udf_write_aext(struct inode *inode, struct extent_position *epos,
2114 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1da177e4
LT		 2115{
2116 int adsize;
2117 uint8_t *ptr;
5ca4e4be
PE		 2118 struct short_ad *sad;
2119 struct long_ad *lad;
48d6d8ff 2120 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 2121
ff116fc8 2122 if (!epos->bh)
382a2287 2123 ptr = iinfo->i_data + epos->offset -
4b11111a 2124 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2125 iinfo->i_lenEAttr;
1da177e4 2126 else
ff116fc8 2127 ptr = epos->bh->b_data + epos->offset;
1da177e4 2128
48d6d8ff 2129 switch (iinfo->i_alloc_type) {
cb00ea35 2130 case ICBTAG_FLAG_AD_SHORT:
5ca4e4be 2131 sad = (struct short_ad *)ptr;
28de7948 2132 sad->extLength = cpu_to_le32(elen);
97e961fd 2133 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
5ca4e4be 2134 adsize = sizeof(struct short_ad);
28de7948 2135 break;
cb00ea35 2136 case ICBTAG_FLAG_AD_LONG:
5ca4e4be 2137 lad = (struct long_ad *)ptr;
28de7948 2138 lad->extLength = cpu_to_le32(elen);
97e961fd 2139 lad->extLocation = cpu_to_lelb(*eloc);
28de7948 2140 memset(lad->impUse, 0x00, sizeof(lad->impUse));
5ca4e4be 2141 adsize = sizeof(struct long_ad);
28de7948 2142 break;
cb00ea35 2143 default:
7e49b6f2 2144 return;
1da177e4
LT		 2145 }
2146
cb00ea35 2147 if (epos->bh) {
28de7948 2148 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2149 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
4b11111a
MS		 2150 struct allocExtDesc *aed =
2151 (struct allocExtDesc *)epos->bh->b_data;
ff116fc8 2152 udf_update_tag(epos->bh->b_data,
4b11111a
MS		 2153 le32_to_cpu(aed->lengthAllocDescs) +
2154 sizeof(struct allocExtDesc));
1da177e4 2155 }
ff116fc8 2156 mark_buffer_dirty_inode(epos->bh, inode);
28de7948 2157 } else {
1da177e4 2158 mark_inode_dirty(inode);
28de7948 2159 }
1da177e4
LT		 2160
2161 if (inc)
ff116fc8 2162 epos->offset += adsize;
1da177e4
LT		 2163}
2164
b0918d9f
VN		 2165/*
2166 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2167 * someone does some weird stuff.
2168 */
2169#define UDF_MAX_INDIR_EXTS 16
2170
4b11111a 2171int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2172 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2173{
2174 int8_t etype;
b0918d9f 2175 unsigned int indirections = 0;
1da177e4 2176
ff116fc8 2177 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
800552ce 2178 (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
b490bdd6 2179 udf_pblk_t block;
b0918d9f
VN		 2180
2181 if (++indirections > UDF_MAX_INDIR_EXTS) {
2182 udf_err(inode->i_sb,
2183 "too many indirect extents in inode %lu\n",
2184 inode->i_ino);
2185 return -1;
2186 }
2187
ff116fc8
JK		 2188 epos->block = *eloc;
2189 epos->offset = sizeof(struct allocExtDesc);
3bf25cb4 2190 brelse(epos->bh);
97e961fd 2191 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
101ee137 2192 epos->bh = sb_bread(inode->i_sb, block);
4b11111a 2193 if (!epos->bh) {
fcbf7637 2194 udf_debug("reading block %u failed!\n", block);
1da177e4
LT		 2195 return -1;
2196 }
2197 }
2198
2199 return etype;
2200}
2201
4b11111a 2202int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2203 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2204{
2205 int alen;
2206 int8_t etype;
2207 uint8_t *ptr;
5ca4e4be
PE		 2208 struct short_ad *sad;
2209 struct long_ad *lad;
48d6d8ff 2210 struct udf_inode_info *iinfo = UDF_I(inode);
28de7948 2211
cb00ea35 2212 if (!epos->bh) {
ff116fc8
JK		 2213 if (!epos->offset)
2214 epos->offset = udf_file_entry_alloc_offset(inode);
382a2287 2215 ptr = iinfo->i_data + epos->offset -
4b11111a 2216 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2217 iinfo->i_lenEAttr;
4b11111a 2218 alen = udf_file_entry_alloc_offset(inode) +
48d6d8ff 2219 iinfo->i_lenAlloc;
cb00ea35 2220 } else {
ff116fc8
JK		 2221 if (!epos->offset)
2222 epos->offset = sizeof(struct allocExtDesc);
2223 ptr = epos->bh->b_data + epos->offset;
28de7948 2224 alen = sizeof(struct allocExtDesc) +
4b11111a
MS		 2225 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2226 lengthAllocDescs);
1da177e4
LT		 2227 }
2228
48d6d8ff 2229 switch (iinfo->i_alloc_type) {
cb00ea35 2230 case ICBTAG_FLAG_AD_SHORT:
4b11111a
MS		 2231 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2232 if (!sad)
28de7948
CG		 2233 return -1;
2234 etype = le32_to_cpu(sad->extLength) >> 30;
2235 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
4b11111a 2236 eloc->partitionReferenceNum =
48d6d8ff 2237 iinfo->i_location.partitionReferenceNum;
28de7948
CG		 2238 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2239 break;
cb00ea35 2240 case ICBTAG_FLAG_AD_LONG:
4b11111a
MS		 2241 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2242 if (!lad)
1da177e4 2243 return -1;
28de7948
CG		 2244 etype = le32_to_cpu(lad->extLength) >> 30;
2245 *eloc = lelb_to_cpu(lad->extLocation);
2246 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2247 break;
2248 default:
fcbf7637 2249 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
28de7948 2250 return -1;
1da177e4
LT		 2251 }
2252
2253 return etype;
2254}
2255
19fd80de
JK		 2256static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2257 struct kernel_lb_addr neloc, uint32_t nelen)
1da177e4 2258{
5ca4e4be 2259 struct kernel_lb_addr oeloc;
1da177e4
LT		 2260 uint32_t oelen;
2261 int8_t etype;
19fd80de 2262 int err;
1da177e4 2263
ff116fc8 2264 if (epos.bh)
3bf25cb4 2265 get_bh(epos.bh);
1da177e4 2266
cb00ea35 2267 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
97e961fd 2268 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1da177e4
LT		 2269 neloc = oeloc;
2270 nelen = (etype << 30) | oelen;
2271 }
19fd80de 2272 err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
3bf25cb4 2273 brelse(epos.bh);
28de7948 2274
19fd80de 2275 return err;
1da177e4
LT		 2276}
2277
6c1e4d06 2278int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
1da177e4 2279{
ff116fc8
JK		 2280 struct extent_position oepos;
2281 int adsize;
1da177e4
LT		 2282 int8_t etype;
2283 struct allocExtDesc *aed;
48d6d8ff 2284 struct udf_inode_info *iinfo;
6c1e4d06
JK		 2285 struct kernel_lb_addr eloc;
2286 uint32_t elen;
1da177e4 2287
cb00ea35 2288 if (epos.bh) {
3bf25cb4
JK		 2289 get_bh(epos.bh);
2290 get_bh(epos.bh);
1da177e4
LT		 2291 }
2292
48d6d8ff
MS		 2293 iinfo = UDF_I(inode);
2294 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2295 adsize = sizeof(struct short_ad);
48d6d8ff 2296 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2297 adsize = sizeof(struct long_ad);
1da177e4
LT		 2298 else
2299 adsize = 0;
2300
ff116fc8
JK		 2301 oepos = epos;
2302 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1da177e4
LT		 2303 return -1;
2304
cb00ea35 2305 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
97e961fd 2306 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
cb00ea35 2307 if (oepos.bh != epos.bh) {
ff116fc8 2308 oepos.block = epos.block;
3bf25cb4
JK		 2309 brelse(oepos.bh);
2310 get_bh(epos.bh);
ff116fc8
JK		 2311 oepos.bh = epos.bh;
2312 oepos.offset = epos.offset - adsize;
1da177e4
LT		 2313 }
2314 }
5ca4e4be 2315 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1da177e4
LT		 2316 elen = 0;
2317
cb00ea35 2318 if (epos.bh != oepos.bh) {
97e961fd
PE		 2319 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2320 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2321 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2322 if (!oepos.bh) {
48d6d8ff 2323 iinfo->i_lenAlloc -= (adsize * 2);
1da177e4 2324 mark_inode_dirty(inode);
cb00ea35 2325 } else {
ff116fc8 2326 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2327 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
28de7948 2328 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2329 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2330 udf_update_tag(oepos.bh->b_data,
2331 oepos.offset - (2 * adsize));
1da177e4 2332 else
4b11111a
MS		 2333 udf_update_tag(oepos.bh->b_data,
2334 sizeof(struct allocExtDesc));
ff116fc8 2335 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4 2336 }
cb00ea35 2337 } else {
97e961fd 2338 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2339 if (!oepos.bh) {
48d6d8ff 2340 iinfo->i_lenAlloc -= adsize;
1da177e4 2341 mark_inode_dirty(inode);
cb00ea35 2342 } else {
ff116fc8 2343 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2344 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
28de7948 2345 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2346 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2347 udf_update_tag(oepos.bh->b_data,
2348 epos.offset - adsize);
1da177e4 2349 else
4b11111a
MS		 2350 udf_update_tag(oepos.bh->b_data,
2351 sizeof(struct allocExtDesc));
ff116fc8 2352 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4
LT		 2353 }
2354 }
647bd61a 2355
3bf25cb4
JK		 2356 brelse(epos.bh);
2357 brelse(oepos.bh);
28de7948 2358
1da177e4
LT		 2359 return (elen >> 30);
2360}
2361
4b11111a 2362int8_t inode_bmap(struct inode *inode, sector_t block,
5ca4e4be 2363 struct extent_position *pos, struct kernel_lb_addr *eloc,
4b11111a 2364 uint32_t *elen, sector_t *offset)
1da177e4 2365{
4b11111a 2366 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
bbc9abd2 2367 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
1da177e4 2368 int8_t etype;
48d6d8ff 2369 struct udf_inode_info *iinfo;
1da177e4 2370
48d6d8ff 2371 iinfo = UDF_I(inode);
99600051
NJ		 2372 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2373 pos->offset = 0;
2374 pos->block = iinfo->i_location;
2375 pos->bh = NULL;
2376 }
1da177e4 2377 *elen = 0;
cb00ea35 2378 do {
4b11111a
MS		 2379 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2380 if (etype == -1) {
2381 *offset = (bcount - lbcount) >> blocksize_bits;
48d6d8ff 2382 iinfo->i_lenExtents = lbcount;
1da177e4
LT		 2383 return -1;
2384 }
2385 lbcount += *elen;
2386 } while (lbcount <= bcount);
99600051 2387 /* update extent cache */
b31c9ed9 2388 udf_update_extent_cache(inode, lbcount - *elen, pos);
4b11111a 2389 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
1da177e4
LT		 2390
2391 return etype;
2392}
Linux 6.x block layer and io_uring tree(s)