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Merge branch 'for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
[linux-2.6-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
faa17292 55static umode_t udf_convert_permissions(struct fileEntry *);
1da177e4 56static int udf_update_inode(struct inode *, int);
49521de1 57static int udf_sync_inode(struct inode *inode);
647bd61a 58static int udf_alloc_i_data(struct inode *inode, size_t size);
7b0b0933 59static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
ff116fc8 60static int8_t udf_insert_aext(struct inode *, struct extent_position,
5ca4e4be 61 struct kernel_lb_addr, uint32_t);
b490bdd6 62static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
3cc6f844 63 struct kernel_long_ad *, int *);
1da177e4 64static void udf_prealloc_extents(struct inode *, int, int,
3cc6f844
FF		 65 struct kernel_long_ad *, int *);
66static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
67static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
68 int, struct extent_position *);
1da177e4
LT		 69static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
70
99600051
NJ		 71static void __udf_clear_extent_cache(struct inode *inode)
72{
73 struct udf_inode_info *iinfo = UDF_I(inode);
74
75 if (iinfo->cached_extent.lstart != -1) {
76 brelse(iinfo->cached_extent.epos.bh);
77 iinfo->cached_extent.lstart = -1;
78 }
79}
80
81/* Invalidate extent cache */
82static void udf_clear_extent_cache(struct inode *inode)
83{
84 struct udf_inode_info *iinfo = UDF_I(inode);
85
86 spin_lock(&iinfo->i_extent_cache_lock);
87 __udf_clear_extent_cache(inode);
88 spin_unlock(&iinfo->i_extent_cache_lock);
89}
90
91/* Return contents of extent cache */
92static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
93 loff_t *lbcount, struct extent_position *pos)
94{
95 struct udf_inode_info *iinfo = UDF_I(inode);
96 int ret = 0;
97
98 spin_lock(&iinfo->i_extent_cache_lock);
99 if ((iinfo->cached_extent.lstart <= bcount) &&
100 (iinfo->cached_extent.lstart != -1)) {
101 /* Cache hit */
102 *lbcount = iinfo->cached_extent.lstart;
103 memcpy(pos, &iinfo->cached_extent.epos,
104 sizeof(struct extent_position));
105 if (pos->bh)
106 get_bh(pos->bh);
107 ret = 1;
108 }
109 spin_unlock(&iinfo->i_extent_cache_lock);
110 return ret;
111}
112
113/* Add extent to extent cache */
114static void udf_update_extent_cache(struct inode *inode, loff_t estart,
b31c9ed9 115 struct extent_position *pos)
99600051
NJ		 116{
117 struct udf_inode_info *iinfo = UDF_I(inode);
118
119 spin_lock(&iinfo->i_extent_cache_lock);
120 /* Invalidate previously cached extent */
121 __udf_clear_extent_cache(inode);
122 if (pos->bh)
123 get_bh(pos->bh);
033c9da0 124 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
99600051 125 iinfo->cached_extent.lstart = estart;
b31c9ed9
FF		 126 switch (iinfo->i_alloc_type) {
127 case ICBTAG_FLAG_AD_SHORT:
128 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
129 break;
130 case ICBTAG_FLAG_AD_LONG:
131 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
132 break;
133 }
99600051
NJ		 134 spin_unlock(&iinfo->i_extent_cache_lock);
135}
b1e32126 136
3aac2b62 137void udf_evict_inode(struct inode *inode)
1da177e4 138{
2c948b3f 139 struct udf_inode_info *iinfo = UDF_I(inode);
3aac2b62
AV		 140 int want_delete = 0;
141
3aac2b62
AV		 142 if (!inode->i_nlink && !is_bad_inode(inode)) {
143 want_delete = 1;
7e49b6f2 144 udf_setsize(inode, 0);
3aac2b62 145 udf_update_inode(inode, IS_SYNC(inode));
91b0abe3
JW		 146 }
147 truncate_inode_pages_final(&inode->i_data);
3aac2b62 148 invalidate_inode_buffers(inode);
dbd5768f 149 clear_inode(inode);
2c948b3f
JK		 150 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
151 inode->i_size != iinfo->i_lenExtents) {
78ace70c
JP		 152 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
153 inode->i_ino, inode->i_mode,
154 (unsigned long long)inode->i_size,
155 (unsigned long long)iinfo->i_lenExtents);
1da177e4 156 }
48d6d8ff
MS		 157 kfree(iinfo->i_ext.i_data);
158 iinfo->i_ext.i_data = NULL;
99600051 159 udf_clear_extent_cache(inode);
3aac2b62 160 if (want_delete) {
3aac2b62 161 udf_free_inode(inode);
3aac2b62 162 }
1da177e4
LT		 163}
164
5eec54fc
IA		 165static void udf_write_failed(struct address_space *mapping, loff_t to)
166{
167 struct inode *inode = mapping->host;
168 struct udf_inode_info *iinfo = UDF_I(inode);
169 loff_t isize = inode->i_size;
170
171 if (to > isize) {
7caef267 172 truncate_pagecache(inode, isize);
5eec54fc
IA		 173 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
174 down_write(&iinfo->i_data_sem);
99600051 175 udf_clear_extent_cache(inode);
5eec54fc
IA		 176 udf_truncate_extents(inode);
177 up_write(&iinfo->i_data_sem);
178 }
179 }
180}
181
1da177e4
LT		 182static int udf_writepage(struct page *page, struct writeback_control *wbc)
183{
184 return block_write_full_page(page, udf_get_block, wbc);
185}
186
378b8e1a
NJ		 187static int udf_writepages(struct address_space *mapping,
188 struct writeback_control *wbc)
189{
190 return mpage_writepages(mapping, wbc, udf_get_block);
191}
192
1da177e4
LT		 193static int udf_readpage(struct file *file, struct page *page)
194{
bc112323
NJ		 195 return mpage_readpage(page, udf_get_block);
196}
197
d4388340 198static void udf_readahead(struct readahead_control *rac)
bc112323 199{
d4388340 200 mpage_readahead(rac, udf_get_block);
1da177e4
LT		 201}
202
be021ee4
NP		 203static int udf_write_begin(struct file *file, struct address_space *mapping,
204 loff_t pos, unsigned len, unsigned flags,
205 struct page **pagep, void **fsdata)
1da177e4 206{
155130a4
CH		 207 int ret;
208
209 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
5eec54fc
IA		 210 if (unlikely(ret))
211 udf_write_failed(mapping, pos + len);
212 return ret;
213}
155130a4 214
c8b8e32d 215static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
5eec54fc
IA		 216{
217 struct file *file = iocb->ki_filp;
218 struct address_space *mapping = file->f_mapping;
219 struct inode *inode = mapping->host;
a6cbcd4a 220 size_t count = iov_iter_count(iter);
5eec54fc
IA		 221 ssize_t ret;
222
c8b8e32d 223 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
6f673763 224 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
c8b8e32d 225 udf_write_failed(mapping, iocb->ki_pos + count);
155130a4 226 return ret;
1da177e4
LT		 227}
228
229static sector_t udf_bmap(struct address_space *mapping, sector_t block)
230{
cb00ea35 231 return generic_block_bmap(mapping, block, udf_get_block);
1da177e4
LT		 232}
233
f5e54d6e 234const struct address_space_operations udf_aops = {
28de7948 235 .readpage = udf_readpage,
d4388340 236 .readahead = udf_readahead,
28de7948 237 .writepage = udf_writepage,
378b8e1a 238 .writepages = udf_writepages,
5eec54fc
IA		 239 .write_begin = udf_write_begin,
240 .write_end = generic_write_end,
241 .direct_IO = udf_direct_IO,
28de7948 242 .bmap = udf_bmap,
1da177e4
LT		 243};
244
d2eb8c35
JK		 245/*
246 * Expand file stored in ICB to a normal one-block-file
247 *
248 * This function requires i_data_sem for writing and releases it.
249 * This function requires i_mutex held
250 */
7e49b6f2 251int udf_expand_file_adinicb(struct inode *inode)
1da177e4
LT		 252{
253 struct page *page;
254 char *kaddr;
48d6d8ff 255 struct udf_inode_info *iinfo = UDF_I(inode);
7e49b6f2 256 int err;
1da177e4
LT		 257 struct writeback_control udf_wbc = {
258 .sync_mode = WB_SYNC_NONE,
259 .nr_to_write = 1,
260 };
261
5955102c 262 WARN_ON_ONCE(!inode_is_locked(inode));
48d6d8ff 263 if (!iinfo->i_lenAlloc) {
1da177e4 264 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 265 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 266 else
48d6d8ff 267 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
7e49b6f2
JK		 268 /* from now on we have normal address_space methods */
269 inode->i_data.a_ops = &udf_aops;
d2eb8c35 270 up_write(&iinfo->i_data_sem);
1da177e4 271 mark_inode_dirty(inode);
7e49b6f2 272 return 0;
1da177e4 273 }
d2eb8c35
JK		 274 /*
275 * Release i_data_sem so that we can lock a page - page lock ranks
276 * above i_data_sem. i_mutex still protects us against file changes.
277 */
278 up_write(&iinfo->i_data_sem);
1da177e4 279
7e49b6f2
JK		 280 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
281 if (!page)
282 return -ENOMEM;
cd7619d6 283
cb00ea35 284 if (!PageUptodate(page)) {
5c26eac4 285 kaddr = kmap_atomic(page);
48d6d8ff 286 memset(kaddr + iinfo->i_lenAlloc, 0x00,
09cbfeaf 287 PAGE_SIZE - iinfo->i_lenAlloc);
48d6d8ff
MS		 288 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
289 iinfo->i_lenAlloc);
1da177e4
LT		 290 flush_dcache_page(page);
291 SetPageUptodate(page);
5c26eac4 292 kunmap_atomic(kaddr);
1da177e4 293 }
d2eb8c35 294 down_write(&iinfo->i_data_sem);
48d6d8ff
MS		 295 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
296 iinfo->i_lenAlloc);
297 iinfo->i_lenAlloc = 0;
1da177e4 298 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
48d6d8ff 299 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
1da177e4 300 else
48d6d8ff 301 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
7e49b6f2
JK		 302 /* from now on we have normal address_space methods */
303 inode->i_data.a_ops = &udf_aops;
d2eb8c35 304 up_write(&iinfo->i_data_sem);
7e49b6f2
JK		 305 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
306 if (err) {
307 /* Restore everything back so that we don't lose data... */
308 lock_page(page);
d2eb8c35 309 down_write(&iinfo->i_data_sem);
5c26eac4 310 kaddr = kmap_atomic(page);
7e49b6f2
JK		 311 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
312 inode->i_size);
5c26eac4 313 kunmap_atomic(kaddr);
7e49b6f2
JK		 314 unlock_page(page);
315 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
316 inode->i_data.a_ops = &udf_adinicb_aops;
d2eb8c35 317 up_write(&iinfo->i_data_sem);
7e49b6f2 318 }
09cbfeaf 319 put_page(page);
1da177e4 320 mark_inode_dirty(inode);
7e49b6f2
JK		 321
322 return err;
1da177e4
LT		 323}
324
b490bdd6
SM		 325struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
326 udf_pblk_t *block, int *err)
1da177e4 327{
b490bdd6 328 udf_pblk_t newblock;
ff116fc8 329 struct buffer_head *dbh = NULL;
5ca4e4be 330 struct kernel_lb_addr eloc;
1da177e4 331 uint8_t alloctype;
ff116fc8 332 struct extent_position epos;
1da177e4
LT		 333
334 struct udf_fileident_bh sfibh, dfibh;
af793295
JK		 335 loff_t f_pos = udf_ext0_offset(inode);
336 int size = udf_ext0_offset(inode) + inode->i_size;
1da177e4 337 struct fileIdentDesc cfi, *sfi, *dfi;
48d6d8ff 338 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4
LT		 339
340 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
341 alloctype = ICBTAG_FLAG_AD_SHORT;
342 else
343 alloctype = ICBTAG_FLAG_AD_LONG;
344
cb00ea35 345 if (!inode->i_size) {
48d6d8ff 346 iinfo->i_alloc_type = alloctype;
1da177e4
LT		 347 mark_inode_dirty(inode);
348 return NULL;
349 }
350
351 /* alloc block, and copy data to it */
352 *block = udf_new_block(inode->i_sb, inode,
48d6d8ff
MS		 353 iinfo->i_location.partitionReferenceNum,
354 iinfo->i_location.logicalBlockNum, err);
1da177e4
LT		 355 if (!(*block))
356 return NULL;
357 newblock = udf_get_pblock(inode->i_sb, *block,
48d6d8ff 358 iinfo->i_location.partitionReferenceNum,
c0b34438 359 0);
1da177e4
LT		 360 if (!newblock)
361 return NULL;
362 dbh = udf_tgetblk(inode->i_sb, newblock);
363 if (!dbh)
364 return NULL;
365 lock_buffer(dbh);
366 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
367 set_buffer_uptodate(dbh);
368 unlock_buffer(dbh);
369 mark_buffer_dirty_inode(dbh, inode);
370
4b11111a 371 sfibh.soffset = sfibh.eoffset =
af793295 372 f_pos & (inode->i_sb->s_blocksize - 1);
ff116fc8 373 sfibh.sbh = sfibh.ebh = NULL;
1da177e4
LT		 374 dfibh.soffset = dfibh.eoffset = 0;
375 dfibh.sbh = dfibh.ebh = dbh;
af793295 376 while (f_pos < size) {
48d6d8ff 377 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
4b11111a
MS		 378 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
379 NULL, NULL, NULL);
cb00ea35 380 if (!sfi) {
3bf25cb4 381 brelse(dbh);
1da177e4
LT		 382 return NULL;
383 }
48d6d8ff 384 iinfo->i_alloc_type = alloctype;
1da177e4
LT		 385 sfi->descTag.tagLocation = cpu_to_le32(*block);
386 dfibh.soffset = dfibh.eoffset;
387 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
388 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
389 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
4b11111a
MS		 390 sfi->fileIdent +
391 le16_to_cpu(sfi->lengthOfImpUse))) {
48d6d8ff 392 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
3bf25cb4 393 brelse(dbh);
1da177e4
LT		 394 return NULL;
395 }
396 }
397 mark_buffer_dirty_inode(dbh, inode);
398
48d6d8ff
MS		 399 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
400 iinfo->i_lenAlloc);
401 iinfo->i_lenAlloc = 0;
1da177e4 402 eloc.logicalBlockNum = *block;
4b11111a 403 eloc.partitionReferenceNum =
48d6d8ff 404 iinfo->i_location.partitionReferenceNum;
2c948b3f 405 iinfo->i_lenExtents = inode->i_size;
ff116fc8 406 epos.bh = NULL;
48d6d8ff 407 epos.block = iinfo->i_location;
ff116fc8 408 epos.offset = udf_file_entry_alloc_offset(inode);
2c948b3f 409 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
1da177e4
LT		 410 /* UniqueID stuff */
411
3bf25cb4 412 brelse(epos.bh);
1da177e4
LT		 413 mark_inode_dirty(inode);
414 return dbh;
415}
416
cb00ea35
CG		 417static int udf_get_block(struct inode *inode, sector_t block,
418 struct buffer_head *bh_result, int create)
1da177e4
LT		 419{
420 int err, new;
1ed16171 421 sector_t phys = 0;
48d6d8ff 422 struct udf_inode_info *iinfo;
1da177e4 423
cb00ea35 424 if (!create) {
1da177e4
LT		 425 phys = udf_block_map(inode, block);
426 if (phys)
427 map_bh(bh_result, inode->i_sb, phys);
428 return 0;
429 }
430
431 err = -EIO;
432 new = 0;
48d6d8ff 433 iinfo = UDF_I(inode);
4d0fb621
AIB		 434
435 down_write(&iinfo->i_data_sem);
48d6d8ff
MS		 436 if (block == iinfo->i_next_alloc_block + 1) {
437 iinfo->i_next_alloc_block++;
438 iinfo->i_next_alloc_goal++;
1da177e4
LT		 439 }
440
99600051 441 udf_clear_extent_cache(inode);
7b0b0933
JK		 442 phys = inode_getblk(inode, block, &err, &new);
443 if (!phys)
1da177e4 444 goto abort;
1da177e4
LT		 445
446 if (new)
447 set_buffer_new(bh_result);
448 map_bh(bh_result, inode->i_sb, phys);
28de7948
CG		 449
450abort:
4d0fb621 451 up_write(&iinfo->i_data_sem);
1da177e4 452 return err;
1da177e4
LT		 453}
454
b490bdd6 455static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
cb00ea35 456 int create, int *err)
1da177e4 457{
28de7948 458 struct buffer_head *bh;
1da177e4
LT		 459 struct buffer_head dummy;
460
461 dummy.b_state = 0;
462 dummy.b_blocknr = -1000;
463 *err = udf_get_block(inode, block, &dummy, create);
cb00ea35 464 if (!*err && buffer_mapped(&dummy)) {
1da177e4 465 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
cb00ea35 466 if (buffer_new(&dummy)) {
1da177e4
LT		 467 lock_buffer(bh);
468 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
469 set_buffer_uptodate(bh);
470 unlock_buffer(bh);
471 mark_buffer_dirty_inode(bh, inode);
472 }
473 return bh;
474 }
28de7948 475
1da177e4
LT		 476 return NULL;
477}
478
fa33cdbf
SM		 479/* Extend the file with new blocks totaling 'new_block_bytes',
480 * return the number of extents added
481 */
7e49b6f2
JK		 482static int udf_do_extend_file(struct inode *inode,
483 struct extent_position *last_pos,
484 struct kernel_long_ad *last_ext,
fa33cdbf 485 loff_t new_block_bytes)
31170b6a 486{
fa33cdbf 487 uint32_t add;
31170b6a
JK		 488 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
489 struct super_block *sb = inode->i_sb;
5ca4e4be 490 struct kernel_lb_addr prealloc_loc = {};
89a4d970 491 uint32_t prealloc_len = 0;
48d6d8ff 492 struct udf_inode_info *iinfo;
7e49b6f2 493 int err;
31170b6a
JK		 494
495 /* The previous extent is fake and we should not extend by anything
496 * - there's nothing to do... */
fa33cdbf 497 if (!new_block_bytes && fake)
31170b6a 498 return 0;
28de7948 499
48d6d8ff 500 iinfo = UDF_I(inode);
31170b6a
JK		 501 /* Round the last extent up to a multiple of block size */
502 if (last_ext->extLength & (sb->s_blocksize - 1)) {
503 last_ext->extLength =
28de7948
CG		 504 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
505 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
506 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
48d6d8ff
MS		 507 iinfo->i_lenExtents =
508 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
28de7948 509 ~(sb->s_blocksize - 1);
31170b6a 510 }
28de7948 511
31170b6a 512 /* Last extent are just preallocated blocks? */
4b11111a
MS		 513 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
514 EXT_NOT_RECORDED_ALLOCATED) {
31170b6a
JK		 515 /* Save the extent so that we can reattach it to the end */
516 prealloc_loc = last_ext->extLocation;
517 prealloc_len = last_ext->extLength;
518 /* Mark the extent as a hole */
519 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
28de7948 520 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
31170b6a 521 last_ext->extLocation.logicalBlockNum = 0;
4b11111a 522 last_ext->extLocation.partitionReferenceNum = 0;
31170b6a 523 }
28de7948 524
31170b6a 525 /* Can we merge with the previous extent? */
4b11111a
MS		 526 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
527 EXT_NOT_RECORDED_NOT_ALLOCATED) {
fa33cdbf
SM		 528 add = (1 << 30) - sb->s_blocksize -
529 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
530 if (add > new_block_bytes)
531 add = new_block_bytes;
532 new_block_bytes -= add;
533 last_ext->extLength += add;
31170b6a
JK		 534 }
535
536 if (fake) {
97e961fd 537 udf_add_aext(inode, last_pos, &last_ext->extLocation,
cb00ea35 538 last_ext->extLength, 1);
31170b6a 539 count++;
6c371578
JK		 540 } else {
541 struct kernel_lb_addr tmploc;
542 uint32_t tmplen;
543
97e961fd 544 udf_write_aext(inode, last_pos, &last_ext->extLocation,
4b11111a 545 last_ext->extLength, 1);
6c371578
JK		 546 /*
547 * We've rewritten the last extent but there may be empty
548 * indirect extent after it - enter it.
549 */
550 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
551 }
28de7948 552
31170b6a 553 /* Managed to do everything necessary? */
fa33cdbf 554 if (!new_block_bytes)
31170b6a
JK		 555 goto out;
556
557 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
558 last_ext->extLocation.logicalBlockNum = 0;
4b11111a 559 last_ext->extLocation.partitionReferenceNum = 0;
fa33cdbf
SM		 560 add = (1 << 30) - sb->s_blocksize;
561 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
28de7948 562
31170b6a 563 /* Create enough extents to cover the whole hole */
fa33cdbf
SM		 564 while (new_block_bytes > add) {
565 new_block_bytes -= add;
7e49b6f2
JK		 566 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
567 last_ext->extLength, 1);
568 if (err)
569 return err;
31170b6a
JK		 570 count++;
571 }
fa33cdbf 572 if (new_block_bytes) {
31170b6a 573 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
fa33cdbf 574 new_block_bytes;
7e49b6f2
JK		 575 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
576 last_ext->extLength, 1);
577 if (err)
578 return err;
31170b6a
JK		 579 count++;
580 }
28de7948
CG		 581
582out:
31170b6a
JK		 583 /* Do we have some preallocated blocks saved? */
584 if (prealloc_len) {
7e49b6f2
JK		 585 err = udf_add_aext(inode, last_pos, &prealloc_loc,
586 prealloc_len, 1);
587 if (err)
588 return err;
31170b6a
JK		 589 last_ext->extLocation = prealloc_loc;
590 last_ext->extLength = prealloc_len;
591 count++;
592 }
28de7948 593
31170b6a 594 /* last_pos should point to the last written extent... */
48d6d8ff 595 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 596 last_pos->offset -= sizeof(struct short_ad);
48d6d8ff 597 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 598 last_pos->offset -= sizeof(struct long_ad);
31170b6a 599 else
7e49b6f2 600 return -EIO;
28de7948 601
31170b6a
JK		 602 return count;
603}
604
fa33cdbf
SM		 605/* Extend the final block of the file to final_block_len bytes */
606static void udf_do_extend_final_block(struct inode *inode,
607 struct extent_position *last_pos,
608 struct kernel_long_ad *last_ext,
609 uint32_t final_block_len)
610{
611 struct super_block *sb = inode->i_sb;
612 uint32_t added_bytes;
613
614 added_bytes = final_block_len -
615 (last_ext->extLength & (sb->s_blocksize - 1));
616 last_ext->extLength += added_bytes;
617 UDF_I(inode)->i_lenExtents += added_bytes;
618
619 udf_write_aext(inode, last_pos, &last_ext->extLocation,
620 last_ext->extLength, 1);
621}
622
7e49b6f2
JK		 623static int udf_extend_file(struct inode *inode, loff_t newsize)
624{
625
626 struct extent_position epos;
627 struct kernel_lb_addr eloc;
628 uint32_t elen;
629 int8_t etype;
630 struct super_block *sb = inode->i_sb;
631 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
fa33cdbf 632 unsigned long partial_final_block;
7e49b6f2
JK		 633 int adsize;
634 struct udf_inode_info *iinfo = UDF_I(inode);
635 struct kernel_long_ad extent;
fa33cdbf
SM		 636 int err = 0;
637 int within_final_block;
7e49b6f2
JK		 638
639 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
640 adsize = sizeof(struct short_ad);
641 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
642 adsize = sizeof(struct long_ad);
643 else
644 BUG();
645
646 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
fa33cdbf 647 within_final_block = (etype != -1);
7e49b6f2 648
7e49b6f2
JK		 649 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
650 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
651 /* File has no extents at all or has empty last
652 * indirect extent! Create a fake extent... */
653 extent.extLocation.logicalBlockNum = 0;
654 extent.extLocation.partitionReferenceNum = 0;
655 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
656 } else {
657 epos.offset -= adsize;
658 etype = udf_next_aext(inode, &epos, &extent.extLocation,
659 &extent.extLength, 0);
660 extent.extLength |= etype << 30;
661 }
fa33cdbf
SM		 662
663 partial_final_block = newsize & (sb->s_blocksize - 1);
664
665 /* File has extent covering the new size (could happen when extending
666 * inside a block)?
667 */
668 if (within_final_block) {
669 /* Extending file within the last file block */
670 udf_do_extend_final_block(inode, &epos, &extent,
671 partial_final_block);
672 } else {
673 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
674 partial_final_block;
675 err = udf_do_extend_file(inode, &epos, &extent, add);
676 }
677
7e49b6f2
JK		 678 if (err < 0)
679 goto out;
680 err = 0;
681 iinfo->i_lenExtents = newsize;
682out:
683 brelse(epos.bh);
684 return err;
685}
686
7b0b0933
JK		 687static sector_t inode_getblk(struct inode *inode, sector_t block,
688 int *err, int *new)
1da177e4 689{
5ca4e4be 690 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
ff116fc8 691 struct extent_position prev_epos, cur_epos, next_epos;
1da177e4 692 int count = 0, startnum = 0, endnum = 0;
85d71244 693 uint32_t elen = 0, tmpelen;
5ca4e4be 694 struct kernel_lb_addr eloc, tmpeloc;
1da177e4 695 int c = 1;
60448b1d 696 loff_t lbcount = 0, b_off = 0;
b490bdd6 697 udf_pblk_t newblocknum, newblock;
60448b1d 698 sector_t offset = 0;
1da177e4 699 int8_t etype;
48d6d8ff 700 struct udf_inode_info *iinfo = UDF_I(inode);
b490bdd6 701 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
31170b6a 702 int lastblock = 0;
fb719c59 703 bool isBeyondEOF;
1da177e4 704
7b0b0933
JK		 705 *err = 0;
706 *new = 0;
ff116fc8 707 prev_epos.offset = udf_file_entry_alloc_offset(inode);
48d6d8ff 708 prev_epos.block = iinfo->i_location;
ff116fc8
JK		 709 prev_epos.bh = NULL;
710 cur_epos = next_epos = prev_epos;
28de7948 711 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 712
713 /* find the extent which contains the block we are looking for.
cb00ea35
CG		 714 alternate between laarr[0] and laarr[1] for locations of the
715 current extent, and the previous extent */
716 do {
717 if (prev_epos.bh != cur_epos.bh) {
3bf25cb4
JK		 718 brelse(prev_epos.bh);
719 get_bh(cur_epos.bh);
ff116fc8 720 prev_epos.bh = cur_epos.bh;
1da177e4 721 }
cb00ea35 722 if (cur_epos.bh != next_epos.bh) {
3bf25cb4
JK		 723 brelse(cur_epos.bh);
724 get_bh(next_epos.bh);
ff116fc8 725 cur_epos.bh = next_epos.bh;
1da177e4
LT		 726 }
727
728 lbcount += elen;
729
ff116fc8
JK		 730 prev_epos.block = cur_epos.block;
731 cur_epos.block = next_epos.block;
1da177e4 732
ff116fc8
JK		 733 prev_epos.offset = cur_epos.offset;
734 cur_epos.offset = next_epos.offset;
1da177e4 735
4b11111a
MS		 736 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
737 if (etype == -1)
1da177e4
LT		 738 break;
739
740 c = !c;
741
742 laarr[c].extLength = (etype << 30) | elen;
743 laarr[c].extLocation = eloc;
744
745 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
746 pgoal = eloc.logicalBlockNum +
28de7948
CG		 747 ((elen + inode->i_sb->s_blocksize - 1) >>
748 inode->i_sb->s_blocksize_bits);
1da177e4 749
cb00ea35 750 count++;
1da177e4
LT		 751 } while (lbcount + elen <= b_off);
752
753 b_off -= lbcount;
754 offset = b_off >> inode->i_sb->s_blocksize_bits;
85d71244
JK		 755 /*
756 * Move prev_epos and cur_epos into indirect extent if we are at
757 * the pointer to it
758 */
759 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
760 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
1da177e4
LT		 761
762 /* if the extent is allocated and recorded, return the block
cb00ea35 763 if the extent is not a multiple of the blocksize, round up */
1da177e4 764
cb00ea35
CG		 765 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
766 if (elen & (inode->i_sb->s_blocksize - 1)) {
1da177e4 767 elen = EXT_RECORDED_ALLOCATED |
28de7948
CG		 768 ((elen + inode->i_sb->s_blocksize - 1) &
769 ~(inode->i_sb->s_blocksize - 1));
7e49b6f2 770 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
1da177e4 771 }
97e961fd 772 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
02d4ca49 773 goto out_free;
1da177e4
LT		 774 }
775
31170b6a 776 /* Are we beyond EOF? */
cb00ea35 777 if (etype == -1) {
31170b6a 778 int ret;
fa33cdbf 779 loff_t hole_len;
6981498d 780 isBeyondEOF = true;
31170b6a
JK		 781 if (count) {
782 if (c)
783 laarr[0] = laarr[1];
784 startnum = 1;
cb00ea35 785 } else {
31170b6a 786 /* Create a fake extent when there's not one */
4b11111a 787 memset(&laarr[0].extLocation, 0x00,
5ca4e4be 788 sizeof(struct kernel_lb_addr));
31170b6a 789 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
7e49b6f2 790 /* Will udf_do_extend_file() create real extent from
4b11111a 791 a fake one? */
31170b6a
JK		 792 startnum = (offset > 0);
793 }
794 /* Create extents for the hole between EOF and offset */
fa33cdbf
SM		 795 hole_len = (loff_t)offset << inode->i_blkbits;
796 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
7e49b6f2 797 if (ret < 0) {
7e49b6f2 798 *err = ret;
02d4ca49
FF		 799 newblock = 0;
800 goto out_free;
31170b6a
JK		 801 }
802 c = 0;
803 offset = 0;
804 count += ret;
805 /* We are not covered by a preallocated extent? */
4b11111a
MS		 806 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
807 EXT_NOT_RECORDED_ALLOCATED) {
31170b6a
JK		 808 /* Is there any real extent? - otherwise we overwrite
809 * the fake one... */
810 if (count)
811 c = !c;
812 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
28de7948 813 inode->i_sb->s_blocksize;
4b11111a 814 memset(&laarr[c].extLocation, 0x00,
5ca4e4be 815 sizeof(struct kernel_lb_addr));
cb00ea35 816 count++;
31170b6a 817 }
cb00ea35 818 endnum = c + 1;
1da177e4 819 lastblock = 1;
cb00ea35 820 } else {
6981498d 821 isBeyondEOF = false;
1da177e4
LT		 822 endnum = startnum = ((count > 2) ? 2 : count);
823
4b11111a
MS		 824 /* if the current extent is in position 0,
825 swap it with the previous */
cb00ea35 826 if (!c && count != 1) {
31170b6a
JK		 827 laarr[2] = laarr[0];
828 laarr[0] = laarr[1];
829 laarr[1] = laarr[2];
830 c = 1;
831 }
1da177e4 832
4b11111a
MS		 833 /* if the current block is located in an extent,
834 read the next extent */
835 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
836 if (etype != -1) {
cb00ea35
CG		 837 laarr[c + 1].extLength = (etype << 30) | elen;
838 laarr[c + 1].extLocation = eloc;
839 count++;
840 startnum++;
841 endnum++;
4b11111a 842 } else
1da177e4
LT		 843 lastblock = 1;
844 }
1da177e4
LT		 845
846 /* if the current extent is not recorded but allocated, get the
28de7948 847 * block in the extent corresponding to the requested block */
4b11111a 848 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
1da177e4 849 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
4b11111a 850 else { /* otherwise, allocate a new block */
48d6d8ff
MS		 851 if (iinfo->i_next_alloc_block == block)
852 goal = iinfo->i_next_alloc_goal;
1da177e4 853
cb00ea35 854 if (!goal) {
4b11111a 855 if (!(goal = pgoal)) /* XXX: what was intended here? */
48d6d8ff 856 goal = iinfo->i_location.logicalBlockNum + 1;
1da177e4
LT		 857 }
858
4b11111a 859 newblocknum = udf_new_block(inode->i_sb, inode,
48d6d8ff 860 iinfo->i_location.partitionReferenceNum,
4b11111a
MS		 861 goal, err);
862 if (!newblocknum) {
1da177e4 863 *err = -ENOSPC;
02d4ca49
FF		 864 newblock = 0;
865 goto out_free;
1da177e4 866 }
fb719c59
NJ		 867 if (isBeyondEOF)
868 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
1da177e4
LT		 869 }
870
4b11111a
MS		 871 /* if the extent the requsted block is located in contains multiple
872 * blocks, split the extent into at most three extents. blocks prior
873 * to requested block, requested block, and blocks after requested
874 * block */
1da177e4
LT		 875 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
876
81056dd0
JK		 877 /* We preallocate blocks only for regular files. It also makes sense
878 * for directories but there's a problem when to drop the
879 * preallocation. We might use some delayed work for that but I feel
880 * it's overengineering for a filesystem like UDF. */
881 if (S_ISREG(inode->i_mode))
882 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
1da177e4
LT		 883
884 /* merge any continuous blocks in laarr */
885 udf_merge_extents(inode, laarr, &endnum);
886
887 /* write back the new extents, inserting new extents if the new number
28de7948
CG		 888 * of extents is greater than the old number, and deleting extents if
889 * the new number of extents is less than the old number */
ff116fc8 890 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
1da177e4 891
4b11111a 892 newblock = udf_get_pblock(inode->i_sb, newblocknum,
48d6d8ff 893 iinfo->i_location.partitionReferenceNum, 0);
7b0b0933
JK		 894 if (!newblock) {
895 *err = -EIO;
02d4ca49 896 goto out_free;
7b0b0933 897 }
1da177e4 898 *new = 1;
48d6d8ff
MS		 899 iinfo->i_next_alloc_block = block;
900 iinfo->i_next_alloc_goal = newblocknum;
c2050a45 901 inode->i_ctime = current_time(inode);
1da177e4
LT		 902
903 if (IS_SYNC(inode))
904 udf_sync_inode(inode);
905 else
906 mark_inode_dirty(inode);
02d4ca49
FF		 907out_free:
908 brelse(prev_epos.bh);
909 brelse(cur_epos.bh);
910 brelse(next_epos.bh);
7b0b0933 911 return newblock;
1da177e4
LT		 912}
913
cb00ea35 914static void udf_split_extents(struct inode *inode, int *c, int offset,
b490bdd6
SM		 915 udf_pblk_t newblocknum,
916 struct kernel_long_ad *laarr, int *endnum)
1da177e4 917{
4b11111a
MS		 918 unsigned long blocksize = inode->i_sb->s_blocksize;
919 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
920
1da177e4 921 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
4b11111a
MS		 922 (laarr[*c].extLength >> 30) ==
923 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1da177e4
LT		 924 int curr = *c;
925 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a 926 blocksize - 1) >> blocksize_bits;
1da177e4
LT		 927 int8_t etype = (laarr[curr].extLength >> 30);
928
4b11111a 929 if (blen == 1)
28de7948 930 ;
4b11111a 931 else if (!offset || blen == offset + 1) {
cb00ea35
CG		 932 laarr[curr + 2] = laarr[curr + 1];
933 laarr[curr + 1] = laarr[curr];
934 } else {
935 laarr[curr + 3] = laarr[curr + 1];
936 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
937 }
938
939 if (offset) {
940 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
4b11111a 941 udf_free_blocks(inode->i_sb, inode,
97e961fd 942 &laarr[curr].extLocation,
4b11111a
MS		 943 0, offset);
944 laarr[curr].extLength =
945 EXT_NOT_RECORDED_NOT_ALLOCATED |
946 (offset << blocksize_bits);
1da177e4 947 laarr[curr].extLocation.logicalBlockNum = 0;
4b11111a
MS		 948 laarr[curr].extLocation.
949 partitionReferenceNum = 0;
950 } else
1da177e4 951 laarr[curr].extLength = (etype << 30) |
4b11111a 952 (offset << blocksize_bits);
cb00ea35
CG		 953 curr++;
954 (*c)++;
955 (*endnum)++;
1da177e4 956 }
647bd61a 957
1da177e4
LT		 958 laarr[curr].extLocation.logicalBlockNum = newblocknum;
959 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
960 laarr[curr].extLocation.partitionReferenceNum =
c0b34438 961 UDF_I(inode)->i_location.partitionReferenceNum;
1da177e4 962 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
4b11111a 963 blocksize;
cb00ea35 964 curr++;
1da177e4 965
cb00ea35 966 if (blen != offset + 1) {
1da177e4 967 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
4b11111a
MS		 968 laarr[curr].extLocation.logicalBlockNum +=
969 offset + 1;
28de7948 970 laarr[curr].extLength = (etype << 30) |
4b11111a 971 ((blen - (offset + 1)) << blocksize_bits);
cb00ea35
CG		 972 curr++;
973 (*endnum)++;
1da177e4
LT		 974 }
975 }
976}
977
978static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
3cc6f844 979 struct kernel_long_ad *laarr,
cb00ea35 980 int *endnum)
1da177e4
LT		 981{
982 int start, length = 0, currlength = 0, i;
983
cb00ea35 984 if (*endnum >= (c + 1)) {
1da177e4
LT		 985 if (!lastblock)
986 return;
987 else
988 start = c;
cb00ea35 989 } else {
4b11111a
MS		 990 if ((laarr[c + 1].extLength >> 30) ==
991 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
cb00ea35 992 start = c + 1;
4b11111a
MS		 993 length = currlength =
994 (((laarr[c + 1].extLength &
995 UDF_EXTENT_LENGTH_MASK) +
996 inode->i_sb->s_blocksize - 1) >>
997 inode->i_sb->s_blocksize_bits);
998 } else
1da177e4
LT		 999 start = c;
1000 }
1001
cb00ea35
CG		 1002 for (i = start + 1; i <= *endnum; i++) {
1003 if (i == *endnum) {
1da177e4
LT		 1004 if (lastblock)
1005 length += UDF_DEFAULT_PREALLOC_BLOCKS;
4b11111a
MS		 1006 } else if ((laarr[i].extLength >> 30) ==
1007 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1008 length += (((laarr[i].extLength &
1009 UDF_EXTENT_LENGTH_MASK) +
1010 inode->i_sb->s_blocksize - 1) >>
1011 inode->i_sb->s_blocksize_bits);
1012 } else
1da177e4
LT		 1013 break;
1014 }
1015
cb00ea35 1016 if (length) {
1da177e4 1017 int next = laarr[start].extLocation.logicalBlockNum +
28de7948 1018 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
4b11111a
MS		 1019 inode->i_sb->s_blocksize - 1) >>
1020 inode->i_sb->s_blocksize_bits);
1da177e4 1021 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
4b11111a
MS		 1022 laarr[start].extLocation.partitionReferenceNum,
1023 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1024 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1025 currlength);
28de7948 1026 if (numalloc) {
4b11111a 1027 if (start == (c + 1))
1da177e4 1028 laarr[start].extLength +=
4b11111a
MS		 1029 (numalloc <<
1030 inode->i_sb->s_blocksize_bits);
1031 else {
cb00ea35 1032 memmove(&laarr[c + 2], &laarr[c + 1],
5ca4e4be 1033 sizeof(struct long_ad) * (*endnum - (c + 1)));
cb00ea35
CG		 1034 (*endnum)++;
1035 laarr[c + 1].extLocation.logicalBlockNum = next;
1036 laarr[c + 1].extLocation.partitionReferenceNum =
4b11111a
MS		 1037 laarr[c].extLocation.
1038 partitionReferenceNum;
1039 laarr[c + 1].extLength =
1040 EXT_NOT_RECORDED_ALLOCATED |
1041 (numalloc <<
1042 inode->i_sb->s_blocksize_bits);
cb00ea35 1043 start = c + 1;
1da177e4
LT		 1044 }
1045
cb00ea35 1046 for (i = start + 1; numalloc && i < *endnum; i++) {
4b11111a
MS		 1047 int elen = ((laarr[i].extLength &
1048 UDF_EXTENT_LENGTH_MASK) +
1049 inode->i_sb->s_blocksize - 1) >>
1050 inode->i_sb->s_blocksize_bits;
1da177e4 1051
cb00ea35 1052 if (elen > numalloc) {
1da177e4 1053 laarr[i].extLength -=
4b11111a
MS		 1054 (numalloc <<
1055 inode->i_sb->s_blocksize_bits);
1da177e4 1056 numalloc = 0;
cb00ea35 1057 } else {
1da177e4 1058 numalloc -= elen;
cb00ea35 1059 if (*endnum > (i + 1))
4b11111a
MS		 1060 memmove(&laarr[i],
1061 &laarr[i + 1],
5ca4e4be 1062 sizeof(struct long_ad) *
4b11111a 1063 (*endnum - (i + 1)));
cb00ea35
CG		 1064 i--;
1065 (*endnum)--;
1da177e4
LT		 1066 }
1067 }
c0b34438 1068 UDF_I(inode)->i_lenExtents +=
4b11111a 1069 numalloc << inode->i_sb->s_blocksize_bits;
1da177e4
LT		 1070 }
1071 }
1072}
1073
3cc6f844 1074static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
cb00ea35 1075 int *endnum)
1da177e4
LT		 1076{
1077 int i;
4b11111a
MS		 1078 unsigned long blocksize = inode->i_sb->s_blocksize;
1079 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1da177e4 1080
cb00ea35 1081 for (i = 0; i < (*endnum - 1); i++) {
5ca4e4be
PE		 1082 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1083 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
4b11111a
MS		 1084
1085 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1086 (((li->extLength >> 30) ==
1087 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1088 ((lip1->extLocation.logicalBlockNum -
1089 li->extLocation.logicalBlockNum) ==
1090 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1091 blocksize - 1) >> blocksize_bits)))) {
1092
1093 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1094 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1095 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1096 lip1->extLength = (lip1->extLength -
1097 (li->extLength &
1098 UDF_EXTENT_LENGTH_MASK) +
1099 UDF_EXTENT_LENGTH_MASK) &
1100 ~(blocksize - 1);
1101 li->extLength = (li->extLength &
1102 UDF_EXTENT_FLAG_MASK) +
1103 (UDF_EXTENT_LENGTH_MASK + 1) -
1104 blocksize;
1105 lip1->extLocation.logicalBlockNum =
1106 li->extLocation.logicalBlockNum +
1107 ((li->extLength &
1108 UDF_EXTENT_LENGTH_MASK) >>
1109 blocksize_bits);
1110 } else {
1111 li->extLength = lip1->extLength +
1112 (((li->extLength &
1113 UDF_EXTENT_LENGTH_MASK) +
1114 blocksize - 1) & ~(blocksize - 1));
1115 if (*endnum > (i + 2))
1116 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1117 sizeof(struct long_ad) *
4b11111a
MS		 1118 (*endnum - (i + 2)));
1119 i--;
1120 (*endnum)--;
1da177e4 1121 }
4b11111a
MS		 1122 } else if (((li->extLength >> 30) ==
1123 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1124 ((lip1->extLength >> 30) ==
1125 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
97e961fd 1126 udf_free_blocks(inode->i_sb, inode, &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
1133 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1134 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1135 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1136 lip1->extLength = (lip1->extLength -
1137 (li->extLength &
1138 UDF_EXTENT_LENGTH_MASK) +
1139 UDF_EXTENT_LENGTH_MASK) &
1140 ~(blocksize - 1);
1141 li->extLength = (li->extLength &
1142 UDF_EXTENT_FLAG_MASK) +
1143 (UDF_EXTENT_LENGTH_MASK + 1) -
1144 blocksize;
cb00ea35 1145 } else {
4b11111a
MS		 1146 li->extLength = lip1->extLength +
1147 (((li->extLength &
1148 UDF_EXTENT_LENGTH_MASK) +
1149 blocksize - 1) & ~(blocksize - 1));
cb00ea35
CG		 1150 if (*endnum > (i + 2))
1151 memmove(&laarr[i + 1], &laarr[i + 2],
5ca4e4be 1152 sizeof(struct long_ad) *
4b11111a 1153 (*endnum - (i + 2)));
cb00ea35
CG		 1154 i--;
1155 (*endnum)--;
1da177e4 1156 }
4b11111a
MS		 1157 } else if ((li->extLength >> 30) ==
1158 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1159 udf_free_blocks(inode->i_sb, inode,
97e961fd 1160 &li->extLocation, 0,
4b11111a
MS		 1161 ((li->extLength &
1162 UDF_EXTENT_LENGTH_MASK) +
1163 blocksize - 1) >> blocksize_bits);
1164 li->extLocation.logicalBlockNum = 0;
1165 li->extLocation.partitionReferenceNum = 0;
1166 li->extLength = (li->extLength &
1167 UDF_EXTENT_LENGTH_MASK) |
1168 EXT_NOT_RECORDED_NOT_ALLOCATED;
1da177e4
LT		 1169 }
1170 }
1171}
1172
3cc6f844 1173static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
cb00ea35
CG		 1174 int startnum, int endnum,
1175 struct extent_position *epos)
1da177e4
LT		 1176{
1177 int start = 0, i;
5ca4e4be 1178 struct kernel_lb_addr tmploc;
1da177e4
LT		 1179 uint32_t tmplen;
1180
cb00ea35
CG		 1181 if (startnum > endnum) {
1182 for (i = 0; i < (startnum - endnum); i++)
6c1e4d06 1183 udf_delete_aext(inode, *epos);
cb00ea35
CG		 1184 } else if (startnum < endnum) {
1185 for (i = 0; i < (endnum - startnum); i++) {
ff116fc8 1186 udf_insert_aext(inode, *epos, laarr[i].extLocation,
cb00ea35 1187 laarr[i].extLength);
ff116fc8 1188 udf_next_aext(inode, epos, &laarr[i].extLocation,
cb00ea35
CG		 1189 &laarr[i].extLength, 1);
1190 start++;
1da177e4
LT		 1191 }
1192 }
1193
cb00ea35 1194 for (i = start; i < endnum; i++) {
ff116fc8 1195 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
97e961fd 1196 udf_write_aext(inode, epos, &laarr[i].extLocation,
cb00ea35 1197 laarr[i].extLength, 1);
1da177e4
LT		 1198 }
1199}
1200
b490bdd6 1201struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
cb00ea35 1202 int create, int *err)
1da177e4 1203{
cb00ea35 1204 struct buffer_head *bh = NULL;
1da177e4
LT		 1205
1206 bh = udf_getblk(inode, block, create, err);
1207 if (!bh)
1208 return NULL;
1209
1210 if (buffer_uptodate(bh))
1211 return bh;
28de7948 1212
dfec8a14 1213 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
28de7948 1214
1da177e4
LT		 1215 wait_on_buffer(bh);
1216 if (buffer_uptodate(bh))
1217 return bh;
28de7948 1218
1da177e4
LT		 1219 brelse(bh);
1220 *err = -EIO;
1221 return NULL;
1222}
1223
7e49b6f2 1224int udf_setsize(struct inode *inode, loff_t newsize)
1da177e4 1225{
1da177e4 1226 int err;
48d6d8ff 1227 struct udf_inode_info *iinfo;
89a4d970 1228 unsigned int bsize = i_blocksize(inode);
1da177e4
LT		 1229
1230 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
cb00ea35 1231 S_ISLNK(inode->i_mode)))
7e49b6f2 1232 return -EINVAL;
1da177e4 1233 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
7e49b6f2 1234 return -EPERM;
1da177e4 1235
48d6d8ff 1236 iinfo = UDF_I(inode);
7e49b6f2 1237 if (newsize > inode->i_size) {
4d0fb621 1238 down_write(&iinfo->i_data_sem);
7e49b6f2
JK		 1239 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1240 if (bsize <
1241 (udf_file_entry_alloc_offset(inode) + newsize)) {
1242 err = udf_expand_file_adinicb(inode);
d2eb8c35 1243 if (err)
7e49b6f2 1244 return err;
d2eb8c35 1245 down_write(&iinfo->i_data_sem);
bb2b6d19 1246 } else {
7e49b6f2 1247 iinfo->i_lenAlloc = newsize;
bb2b6d19
IA		 1248 goto set_size;
1249 }
7e49b6f2
JK		 1250 }
1251 err = udf_extend_file(inode, newsize);
1252 if (err) {
1253 up_write(&iinfo->i_data_sem);
1254 return err;
1da177e4 1255 }
bb2b6d19 1256set_size:
4d0fb621 1257 up_write(&iinfo->i_data_sem);
f2e95355 1258 truncate_setsize(inode, newsize);
cb00ea35 1259 } else {
7e49b6f2
JK		 1260 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1261 down_write(&iinfo->i_data_sem);
99600051 1262 udf_clear_extent_cache(inode);
7e49b6f2
JK		 1263 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1264 0x00, bsize - newsize -
1265 udf_file_entry_alloc_offset(inode));
1266 iinfo->i_lenAlloc = newsize;
1267 truncate_setsize(inode, newsize);
1268 up_write(&iinfo->i_data_sem);
1269 goto update_time;
1270 }
1271 err = block_truncate_page(inode->i_mapping, newsize,
1272 udf_get_block);
1273 if (err)
1274 return err;
f2e95355 1275 truncate_setsize(inode, newsize);
4d0fb621 1276 down_write(&iinfo->i_data_sem);
99600051 1277 udf_clear_extent_cache(inode);
2b42be5e 1278 err = udf_truncate_extents(inode);
4d0fb621 1279 up_write(&iinfo->i_data_sem);
2b42be5e
JK		 1280 if (err)
1281 return err;
647bd61a 1282 }
7e49b6f2 1283update_time:
c2050a45 1284 inode->i_mtime = inode->i_ctime = current_time(inode);
1da177e4 1285 if (IS_SYNC(inode))
cb00ea35 1286 udf_sync_inode(inode);
1da177e4
LT		 1287 else
1288 mark_inode_dirty(inode);
7e49b6f2 1289 return 0;
1da177e4
LT		 1290}
1291
c03aa9f6
JK		 1292/*
1293 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1294 * arbitrary - just that we hopefully don't limit any real use of rewritten
1295 * inode on write-once media but avoid looping for too long on corrupted media.
1296 */
1297#define UDF_MAX_ICB_NESTING 1024
1298
6174c2eb 1299static int udf_read_inode(struct inode *inode, bool hidden_inode)
1da177e4
LT		 1300{
1301 struct buffer_head *bh = NULL;
1302 struct fileEntry *fe;
bb7720a0 1303 struct extendedFileEntry *efe;
1da177e4 1304 uint16_t ident;
48d6d8ff 1305 struct udf_inode_info *iinfo = UDF_I(inode);
bb7720a0 1306 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
6d3d5e86 1307 struct kernel_lb_addr *iloc = &iinfo->i_location;
bb7720a0 1308 unsigned int link_count;
c03aa9f6 1309 unsigned int indirections = 0;
79144954 1310 int bs = inode->i_sb->s_blocksize;
6d3d5e86 1311 int ret = -EIO;
0c9850f4 1312 uint32_t uid, gid;
1da177e4 1313
c03aa9f6 1314reread:
1d82a56b 1315 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
fcbf7637 1316 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1d82a56b
FF		 1317 iloc->partitionReferenceNum, sbi->s_partitions);
1318 return -EIO;
1319 }
1320
6d3d5e86
JK		 1321 if (iloc->logicalBlockNum >=
1322 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
fcbf7637 1323 udf_debug("block=%u, partition=%u out of range\n",
6d3d5e86
JK		 1324 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1325 return -EIO;
1326 }
1327
1da177e4
LT		 1328 /*
1329 * Set defaults, but the inode is still incomplete!
1330 * Note: get_new_inode() sets the following on a new inode:
1331 * i_sb = sb
1332 * i_no = ino
1333 * i_flags = sb->s_flags
1334 * i_state = 0
1335 * clean_inode(): zero fills and sets
1336 * i_count = 1
1337 * i_nlink = 1
1338 * i_op = NULL;
1339 */
6d3d5e86 1340 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
cb00ea35 1341 if (!bh) {
fcbf7637 1342 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
6d3d5e86 1343 return -EIO;
1da177e4
LT		 1344 }
1345
1346 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
cb00ea35 1347 ident != TAG_IDENT_USE) {
fcbf7637 1348 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
78ace70c 1349 inode->i_ino, ident);
6d3d5e86 1350 goto out;
1da177e4
LT		 1351 }
1352
1353 fe = (struct fileEntry *)bh->b_data;
bb7720a0 1354 efe = (struct extendedFileEntry *)bh->b_data;
1da177e4 1355
5e0f0017 1356 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1ab92785 1357 struct buffer_head *ibh;
1da177e4 1358
6d3d5e86 1359 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1ab92785 1360 if (ident == TAG_IDENT_IE && ibh) {
5ca4e4be 1361 struct kernel_lb_addr loc;
1ab92785 1362 struct indirectEntry *ie;
1363
1364 ie = (struct indirectEntry *)ibh->b_data;
1365 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1366
c03aa9f6 1367 if (ie->indirectICB.extLength) {
c03aa9f6
JK		 1368 brelse(ibh);
1369 memcpy(&iinfo->i_location, &loc,
1370 sizeof(struct kernel_lb_addr));
1371 if (++indirections > UDF_MAX_ICB_NESTING) {
1372 udf_err(inode->i_sb,
1373 "too many ICBs in ICB hierarchy"
1374 " (max %d supported)\n",
1375 UDF_MAX_ICB_NESTING);
6d3d5e86 1376 goto out;
28de7948 1377 }
6d3d5e86 1378 brelse(bh);
c03aa9f6 1379 goto reread;
1da177e4 1380 }
28de7948 1381 }
1ab92785 1382 brelse(ibh);
5e0f0017 1383 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
fcbf7637 1384 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
78ace70c 1385 le16_to_cpu(fe->icbTag.strategyType));
6d3d5e86 1386 goto out;
1da177e4 1387 }
5e0f0017 1388 if (fe->icbTag.strategyType == cpu_to_le16(4))
48d6d8ff 1389 iinfo->i_strat4096 = 0;
5e0f0017 1390 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
48d6d8ff 1391 iinfo->i_strat4096 = 1;
1da177e4 1392
48d6d8ff 1393 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
4b11111a 1394 ICBTAG_FLAG_AD_MASK;
d288d958
JK		 1395 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1396 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1397 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1398 ret = -EIO;
1399 goto out;
1400 }
48d6d8ff
MS		 1401 iinfo->i_unique = 0;
1402 iinfo->i_lenEAttr = 0;
1403 iinfo->i_lenExtents = 0;
1404 iinfo->i_lenAlloc = 0;
1405 iinfo->i_next_alloc_block = 0;
1406 iinfo->i_next_alloc_goal = 0;
5e0f0017 1407 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
48d6d8ff
MS		 1408 iinfo->i_efe = 1;
1409 iinfo->i_use = 0;
79144954 1410 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1411 sizeof(struct extendedFileEntry));
1412 if (ret)
1413 goto out;
48d6d8ff 1414 memcpy(iinfo->i_ext.i_data,
4b11111a 1415 bh->b_data + sizeof(struct extendedFileEntry),
79144954 1416 bs - sizeof(struct extendedFileEntry));
5e0f0017 1417 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
48d6d8ff
MS		 1418 iinfo->i_efe = 0;
1419 iinfo->i_use = 0;
79144954 1420 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
6d3d5e86
JK		 1421 if (ret)
1422 goto out;
48d6d8ff 1423 memcpy(iinfo->i_ext.i_data,
c0b34438 1424 bh->b_data + sizeof(struct fileEntry),
79144954 1425 bs - sizeof(struct fileEntry));
5e0f0017 1426 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
48d6d8ff
MS		 1427 iinfo->i_efe = 0;
1428 iinfo->i_use = 1;
1429 iinfo->i_lenAlloc = le32_to_cpu(
4b11111a
MS		 1430 ((struct unallocSpaceEntry *)bh->b_data)->
1431 lengthAllocDescs);
79144954 1432 ret = udf_alloc_i_data(inode, bs -
6d3d5e86
JK		 1433 sizeof(struct unallocSpaceEntry));
1434 if (ret)
1435 goto out;
48d6d8ff 1436 memcpy(iinfo->i_ext.i_data,
4b11111a 1437 bh->b_data + sizeof(struct unallocSpaceEntry),
79144954 1438 bs - sizeof(struct unallocSpaceEntry));
6d3d5e86 1439 return 0;
1da177e4
LT		 1440 }
1441
6d3d5e86 1442 ret = -EIO;
c03cad24 1443 read_lock(&sbi->s_cred_lock);
0c9850f4
JK		 1444 uid = le32_to_cpu(fe->uid);
1445 if (uid == UDF_INVALID_ID ||
ca76d2d8 1446 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
0c9850f4
JK		 1447 inode->i_uid = sbi->s_uid;
1448 else
1449 i_uid_write(inode, uid);
1da177e4 1450
0c9850f4
JK		 1451 gid = le32_to_cpu(fe->gid);
1452 if (gid == UDF_INVALID_ID ||
ca76d2d8 1453 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
0c9850f4
JK		 1454 inode->i_gid = sbi->s_gid;
1455 else
1456 i_gid_write(inode, gid);
1da177e4 1457
7ac9bcd5 1458 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1459 sbi->s_fmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1460 inode->i_mode = sbi->s_fmode;
1461 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
87bc730c 1462 sbi->s_dmode != UDF_INVALID_MODE)
7ac9bcd5
MS		 1463 inode->i_mode = sbi->s_dmode;
1464 else
1465 inode->i_mode = udf_convert_permissions(fe);
1466 inode->i_mode &= ~sbi->s_umask;
c3367a1b
SM		 1467 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1468
c03cad24
JK		 1469 read_unlock(&sbi->s_cred_lock);
1470
bfe86848 1471 link_count = le16_to_cpu(fe->fileLinkCount);
4071b913 1472 if (!link_count) {
6174c2eb
JK		 1473 if (!hidden_inode) {
1474 ret = -ESTALE;
1475 goto out;
1476 }
1477 link_count = 1;
4071b913 1478 }
bfe86848 1479 set_nlink(inode, link_count);
c03cad24
JK		 1480
1481 inode->i_size = le64_to_cpu(fe->informationLength);
1482 iinfo->i_lenExtents = inode->i_size;
1da177e4 1483
48d6d8ff 1484 if (iinfo->i_efe == 0) {
1da177e4 1485 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
28de7948 1486 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1487
c3b9cecd
AB		 1488 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1489 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1490 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1da177e4 1491
48d6d8ff
MS		 1492 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1493 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1494 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
d5e2cf07 1495 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
ab9a3a73
SM		 1496 iinfo->i_streamdir = 0;
1497 iinfo->i_lenStreams = 0;
cb00ea35 1498 } else {
647bd61a 1499 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
cb00ea35 1500 (inode->i_sb->s_blocksize_bits - 9);
1da177e4 1501
c3b9cecd
AB		 1502 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1503 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
0220edda 1504 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
c3b9cecd 1505 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1da177e4 1506
48d6d8ff
MS		 1507 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1508 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1509 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
d5e2cf07 1510 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
ab9a3a73
SM		 1511
1512 /* Named streams */
1513 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1514 iinfo->i_locStreamdir =
1515 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1516 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1517 if (iinfo->i_lenStreams >= inode->i_size)
1518 iinfo->i_lenStreams -= inode->i_size;
1519 else
1520 iinfo->i_lenStreams = 0;
1da177e4 1521 }
470cca56 1522 inode->i_generation = iinfo->i_unique;
1da177e4 1523
23b133bd
JK		 1524 /*
1525 * Sanity check length of allocation descriptors and extended attrs to
1526 * avoid integer overflows
1527 */
1528 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1529 goto out;
1530 /* Now do exact checks */
1531 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1532 goto out;
e159332b
JK		 1533 /* Sanity checks for files in ICB so that we don't get confused later */
1534 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1535 /*
1536 * For file in ICB data is stored in allocation descriptor
1537 * so sizes should match
1538 */
1539 if (iinfo->i_lenAlloc != inode->i_size)
1540 goto out;
1541 /* File in ICB has to fit in there... */
79144954 1542 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
e159332b
JK		 1543 goto out;
1544 }
1545
cb00ea35
CG		 1546 switch (fe->icbTag.fileType) {
1547 case ICBTAG_FILE_TYPE_DIRECTORY:
28de7948
CG		 1548 inode->i_op = &udf_dir_inode_operations;
1549 inode->i_fop = &udf_dir_operations;
1550 inode->i_mode |= S_IFDIR;
1551 inc_nlink(inode);
1552 break;
cb00ea35
CG		 1553 case ICBTAG_FILE_TYPE_REALTIME:
1554 case ICBTAG_FILE_TYPE_REGULAR:
1555 case ICBTAG_FILE_TYPE_UNDEF:
742e1795 1556 case ICBTAG_FILE_TYPE_VAT20:
48d6d8ff 1557 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
28de7948
CG		 1558 inode->i_data.a_ops = &udf_adinicb_aops;
1559 else
1560 inode->i_data.a_ops = &udf_aops;
1561 inode->i_op = &udf_file_inode_operations;
1562 inode->i_fop = &udf_file_operations;
1563 inode->i_mode |= S_IFREG;
1564 break;
cb00ea35 1565 case ICBTAG_FILE_TYPE_BLOCK:
28de7948
CG		 1566 inode->i_mode |= S_IFBLK;
1567 break;
cb00ea35 1568 case ICBTAG_FILE_TYPE_CHAR:
28de7948
CG		 1569 inode->i_mode |= S_IFCHR;
1570 break;
cb00ea35 1571 case ICBTAG_FILE_TYPE_FIFO:
28de7948
CG		 1572 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1573 break;
cb00ea35 1574 case ICBTAG_FILE_TYPE_SOCKET:
28de7948
CG		 1575 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1576 break;
cb00ea35 1577 case ICBTAG_FILE_TYPE_SYMLINK:
28de7948 1578 inode->i_data.a_ops = &udf_symlink_aops;
ad4d0532 1579 inode->i_op = &udf_symlink_inode_operations;
21fc61c7 1580 inode_nohighmem(inode);
6ff6b2b3 1581 inode->i_mode = S_IFLNK | 0777;
28de7948 1582 break;
bfb257a5
JK		 1583 case ICBTAG_FILE_TYPE_MAIN:
1584 udf_debug("METADATA FILE-----\n");
1585 break;
1586 case ICBTAG_FILE_TYPE_MIRROR:
1587 udf_debug("METADATA MIRROR FILE-----\n");
1588 break;
1589 case ICBTAG_FILE_TYPE_BITMAP:
1590 udf_debug("METADATA BITMAP FILE-----\n");
1591 break;
cb00ea35 1592 default:
fcbf7637 1593 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
78ace70c 1594 inode->i_ino, fe->icbTag.fileType);
6d3d5e86 1595 goto out;
1da177e4 1596 }
cb00ea35 1597 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
4b11111a
MS		 1598 struct deviceSpec *dsea =
1599 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35
CG		 1600 if (dsea) {
1601 init_special_inode(inode, inode->i_mode,
4b11111a
MS		 1602 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1603 le32_to_cpu(dsea->minorDeviceIdent)));
1da177e4 1604 /* Developer ID ??? */
4b11111a 1605 } else
6d3d5e86 1606 goto out;
1da177e4 1607 }
6d3d5e86
JK		 1608 ret = 0;
1609out:
bb7720a0 1610 brelse(bh);
6d3d5e86 1611 return ret;
1da177e4
LT		 1612}
1613
647bd61a
CG		 1614static int udf_alloc_i_data(struct inode *inode, size_t size)
1615{
48d6d8ff
MS		 1616 struct udf_inode_info *iinfo = UDF_I(inode);
1617 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
b5f52454 1618 if (!iinfo->i_ext.i_data)
647bd61a 1619 return -ENOMEM;
647bd61a
CG		 1620 return 0;
1621}
1622
faa17292 1623static umode_t udf_convert_permissions(struct fileEntry *fe)
1da177e4 1624{
faa17292 1625 umode_t mode;
1da177e4
LT		 1626 uint32_t permissions;
1627 uint32_t flags;
1628
1629 permissions = le32_to_cpu(fe->permissions);
1630 flags = le16_to_cpu(fe->icbTag.flags);
1631
6ff6b2b3
FF		 1632 mode = ((permissions) & 0007) |
1633 ((permissions >> 2) & 0070) |
1634 ((permissions >> 4) & 0700) |
4b11111a
MS		 1635 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1636 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1637 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1da177e4
LT		 1638
1639 return mode;
1640}
1641
c3367a1b
SM		 1642void udf_update_extra_perms(struct inode *inode, umode_t mode)
1643{
1644 struct udf_inode_info *iinfo = UDF_I(inode);
1645
1646 /*
1647 * UDF 2.01 sec. 3.3.3.3 Note 2:
1648 * In Unix, delete permission tracks write
1649 */
1650 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1651 if (mode & 0200)
1652 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1653 if (mode & 0020)
1654 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1655 if (mode & 0002)
1656 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1657}
1658
a9185b41 1659int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4 1660{
49521de1 1661 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1da177e4
LT		 1662}
1663
49521de1 1664static int udf_sync_inode(struct inode *inode)
1da177e4
LT		 1665{
1666 return udf_update_inode(inode, 1);
1667}
1668
c3b9cecd 1669static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
7ed0fbd7
FF		 1670{
1671 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1672 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1673 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1674 iinfo->i_crtime = time;
1675}
1676
cb00ea35 1677static int udf_update_inode(struct inode *inode, int do_sync)
1da177e4
LT		 1678{
1679 struct buffer_head *bh = NULL;
1680 struct fileEntry *fe;
1681 struct extendedFileEntry *efe;
b2527bfa 1682 uint64_t lb_recorded;
1da177e4
LT		 1683 uint32_t udfperms;
1684 uint16_t icbflags;
1685 uint16_t crclen;
1da177e4 1686 int err = 0;
6c79e987 1687 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
4b11111a 1688 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
48d6d8ff 1689 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 1690
5833ded9
JK		 1691 bh = udf_tgetblk(inode->i_sb,
1692 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
cb00ea35 1693 if (!bh) {
aae917cd 1694 udf_debug("getblk failure\n");
0fd2ba36 1695 return -EIO;
1da177e4
LT		 1696 }
1697
aae917cd
JK		 1698 lock_buffer(bh);
1699 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1da177e4
LT		 1700 fe = (struct fileEntry *)bh->b_data;
1701 efe = (struct extendedFileEntry *)bh->b_data;
1702
aae917cd 1703 if (iinfo->i_use) {
1da177e4 1704 struct unallocSpaceEntry *use =
28de7948 1705 (struct unallocSpaceEntry *)bh->b_data;
1da177e4 1706
48d6d8ff 1707 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
4b11111a 1708 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
48d6d8ff 1709 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
4b11111a 1710 sizeof(struct unallocSpaceEntry));
aae917cd 1711 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
70f19f58 1712 crclen = sizeof(struct unallocSpaceEntry);
1da177e4 1713
70f19f58 1714 goto finish;
1da177e4
LT		 1715 }
1716
4d6660eb 1717 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
0c9850f4 1718 fe->uid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1719 else
c2ba138a 1720 fe->uid = cpu_to_le32(i_uid_read(inode));
1da177e4 1721
4d6660eb 1722 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
0c9850f4 1723 fe->gid = cpu_to_le32(UDF_INVALID_ID);
cb00ea35 1724 else
c2ba138a 1725 fe->gid = cpu_to_le32(i_gid_read(inode));
1da177e4 1726
6ff6b2b3
FF		 1727 udfperms = ((inode->i_mode & 0007)) |
1728 ((inode->i_mode & 0070) << 2) |
1729 ((inode->i_mode & 0700) << 4);
1da177e4 1730
c3367a1b 1731 udfperms |= iinfo->i_extraPerms;
1da177e4
LT		 1732 fe->permissions = cpu_to_le32(udfperms);
1733
8a70ee33 1734 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1da177e4
LT		 1735 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1736 else
1737 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1738
1739 fe->informationLength = cpu_to_le64(inode->i_size);
1740
cb00ea35 1741 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
5ca4e4be 1742 struct regid *eid;
28de7948
CG		 1743 struct deviceSpec *dsea =
1744 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
cb00ea35 1745 if (!dsea) {
1da177e4 1746 dsea = (struct deviceSpec *)
28de7948
CG		 1747 udf_add_extendedattr(inode,
1748 sizeof(struct deviceSpec) +
5ca4e4be 1749 sizeof(struct regid), 12, 0x3);
1da177e4
LT		 1750 dsea->attrType = cpu_to_le32(12);
1751 dsea->attrSubtype = 1;
4b11111a
MS		 1752 dsea->attrLength = cpu_to_le32(
1753 sizeof(struct deviceSpec) +
5ca4e4be
PE		 1754 sizeof(struct regid));
1755 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1da177e4 1756 }
5ca4e4be 1757 eid = (struct regid *)dsea->impUse;
033c9da0 1758 memset(eid, 0, sizeof(*eid));
1da177e4
LT		 1759 strcpy(eid->ident, UDF_ID_DEVELOPER);
1760 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1761 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1762 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1763 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1764 }
1765
b2527bfa
SN		 1766 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1767 lb_recorded = 0; /* No extents => no blocks! */
1768 else
1769 lb_recorded =
1770 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1771 (blocksize_bits - 9);
1772
48d6d8ff 1773 if (iinfo->i_efe == 0) {
c0b34438 1774 memcpy(bh->b_data + sizeof(struct fileEntry),
48d6d8ff 1775 iinfo->i_ext.i_data,
cb00ea35 1776 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
b2527bfa 1777 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1778
c3b9cecd
AB		 1779 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1780 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1781 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
5ca4e4be 1782 memset(&(fe->impIdent), 0, sizeof(struct regid));
1da177e4
LT		 1783 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1784 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1785 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1786 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1787 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1788 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1789 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1790 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1791 crclen = sizeof(struct fileEntry);
cb00ea35 1792 } else {
4b11111a 1793 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
48d6d8ff 1794 iinfo->i_ext.i_data,
4b11111a
MS		 1795 inode->i_sb->s_blocksize -
1796 sizeof(struct extendedFileEntry));
ab9a3a73
SM		 1797 efe->objectSize =
1798 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
b2527bfa 1799 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1da177e4 1800
ab9a3a73
SM		 1801 if (iinfo->i_streamdir) {
1802 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1803
1804 icb_lad->extLocation =
1805 cpu_to_lelb(iinfo->i_locStreamdir);
1806 icb_lad->extLength =
1807 cpu_to_le32(inode->i_sb->s_blocksize);
1808 }
1809
c3b9cecd
AB		 1810 udf_adjust_time(iinfo, inode->i_atime);
1811 udf_adjust_time(iinfo, inode->i_mtime);
1812 udf_adjust_time(iinfo, inode->i_ctime);
1da177e4 1813
c3b9cecd
AB		 1814 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1815 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
56774805 1816 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
c3b9cecd 1817 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1da177e4 1818
033c9da0 1819 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1da177e4
LT		 1820 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1821 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1822 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
48d6d8ff
MS		 1823 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1824 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1825 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
d5e2cf07 1826 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1da177e4
LT		 1827 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1828 crclen = sizeof(struct extendedFileEntry);
1829 }
70f19f58
SM		 1830
1831finish:
48d6d8ff 1832 if (iinfo->i_strat4096) {
1da177e4
LT		 1833 fe->icbTag.strategyType = cpu_to_le16(4096);
1834 fe->icbTag.strategyParameter = cpu_to_le16(1);
1835 fe->icbTag.numEntries = cpu_to_le16(2);
cb00ea35 1836 } else {
1da177e4
LT		 1837 fe->icbTag.strategyType = cpu_to_le16(4);
1838 fe->icbTag.numEntries = cpu_to_le16(1);
1839 }
1840
70f19f58
SM		 1841 if (iinfo->i_use)
1842 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1843 else if (S_ISDIR(inode->i_mode))
1da177e4
LT		 1844 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1845 else if (S_ISREG(inode->i_mode))
1846 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1847 else if (S_ISLNK(inode->i_mode))
1848 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1849 else if (S_ISBLK(inode->i_mode))
1850 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1851 else if (S_ISCHR(inode->i_mode))
1852 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1853 else if (S_ISFIFO(inode->i_mode))
1854 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1855 else if (S_ISSOCK(inode->i_mode))
1856 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1857
48d6d8ff 1858 icbflags = iinfo->i_alloc_type |
28de7948
CG		 1859 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1860 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1861 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1862 (le16_to_cpu(fe->icbTag.flags) &
1863 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1864 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1da177e4
LT		 1865
1866 fe->icbTag.flags = cpu_to_le16(icbflags);
6c79e987 1867 if (sbi->s_udfrev >= 0x0200)
1da177e4
LT		 1868 fe->descTag.descVersion = cpu_to_le16(3);
1869 else
1870 fe->descTag.descVersion = cpu_to_le16(2);
6c79e987 1871 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
4b11111a 1872 fe->descTag.tagLocation = cpu_to_le32(
48d6d8ff 1873 iinfo->i_location.logicalBlockNum);
aae917cd 1874 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1da177e4 1875 fe->descTag.descCRCLength = cpu_to_le16(crclen);
5ca4e4be 1876 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
f845fced 1877 crclen));
3f2587bb 1878 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1da177e4 1879
5833ded9 1880 set_buffer_uptodate(bh);
aae917cd
JK		 1881 unlock_buffer(bh);
1882
1da177e4
LT		 1883 /* write the data blocks */
1884 mark_buffer_dirty(bh);
cb00ea35 1885 if (do_sync) {
1da177e4 1886 sync_dirty_buffer(bh);
aae917cd 1887 if (buffer_write_io_error(bh)) {
78ace70c
JP		 1888 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1889 inode->i_ino);
1da177e4
LT		 1890 err = -EIO;
1891 }
1892 }
3bf25cb4 1893 brelse(bh);
28de7948 1894
1da177e4
LT		 1895 return err;
1896}
1897
6174c2eb
JK		 1898struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1899 bool hidden_inode)
1da177e4
LT		 1900{
1901 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1902 struct inode *inode = iget_locked(sb, block);
6d3d5e86 1903 int err;
1da177e4
LT		 1904
1905 if (!inode)
6d3d5e86 1906 return ERR_PTR(-ENOMEM);
1da177e4 1907
6d3d5e86
JK		 1908 if (!(inode->i_state & I_NEW))
1909 return inode;
1da177e4 1910
6d3d5e86 1911 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
6174c2eb 1912 err = udf_read_inode(inode, hidden_inode);
6d3d5e86
JK		 1913 if (err < 0) {
1914 iget_failed(inode);
1915 return ERR_PTR(err);
1da177e4 1916 }
6d3d5e86 1917 unlock_new_inode(inode);
1da177e4
LT		 1918
1919 return inode;
1da177e4
LT		 1920}
1921
b490bdd6 1922int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
fcea62ba 1923 struct extent_position *epos)
1da177e4 1924{
fcea62ba
JK		 1925 struct super_block *sb = inode->i_sb;
1926 struct buffer_head *bh;
1da177e4 1927 struct allocExtDesc *aed;
fcea62ba
JK		 1928 struct extent_position nepos;
1929 struct kernel_lb_addr neloc;
1930 int ver, adsize;
1da177e4 1931
fcea62ba
JK		 1932 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1933 adsize = sizeof(struct short_ad);
1934 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1935 adsize = sizeof(struct long_ad);
1da177e4 1936 else
4f1b1519 1937 return -EIO;
fcea62ba
JK		 1938
1939 neloc.logicalBlockNum = block;
1940 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1941
1942 bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1943 if (!bh)
1944 return -EIO;
1945 lock_buffer(bh);
1946 memset(bh->b_data, 0x00, sb->s_blocksize);
1947 set_buffer_uptodate(bh);
1948 unlock_buffer(bh);
1949 mark_buffer_dirty_inode(bh, inode);
1950
1951 aed = (struct allocExtDesc *)(bh->b_data);
1952 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1953 aed->previousAllocExtLocation =
1954 cpu_to_le32(epos->block.logicalBlockNum);
1955 }
1956 aed->lengthAllocDescs = cpu_to_le32(0);
1957 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1958 ver = 3;
1da177e4 1959 else
fcea62ba
JK		 1960 ver = 2;
1961 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1962 sizeof(struct tag));
1963
1964 nepos.block = neloc;
1965 nepos.offset = sizeof(struct allocExtDesc);
1966 nepos.bh = bh;
1967
1968 /*
1969 * Do we have to copy current last extent to make space for indirect
1970 * one?
1971 */
1972 if (epos->offset + adsize > sb->s_blocksize) {
1973 struct kernel_lb_addr cp_loc;
1974 uint32_t cp_len;
1975 int cp_type;
1976
1977 epos->offset -= adsize;
1978 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1979 cp_len |= ((uint32_t)cp_type) << 30;
1980
1981 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1982 udf_write_aext(inode, epos, &nepos.block,
800552ce 1983 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 1984 } else {
1985 __udf_add_aext(inode, epos, &nepos.block,
800552ce 1986 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
fcea62ba
JK		 1987 }
1988
1989 brelse(epos->bh);
1990 *epos = nepos;
1991
1992 return 0;
1993}
1994
1995/*
1996 * Append extent at the given position - should be the first free one in inode
1997 * / indirect extent. This function assumes there is enough space in the inode
1998 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1999 */
2000int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2001 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2002{
2003 struct udf_inode_info *iinfo = UDF_I(inode);
2004 struct allocExtDesc *aed;
2005 int adsize;
1da177e4 2006
48d6d8ff 2007 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2008 adsize = sizeof(struct short_ad);
48d6d8ff 2009 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2010 adsize = sizeof(struct long_ad);
1da177e4 2011 else
7e49b6f2 2012 return -EIO;
1da177e4 2013
fcea62ba
JK		 2014 if (!epos->bh) {
2015 WARN_ON(iinfo->i_lenAlloc !=
2016 epos->offset - udf_file_entry_alloc_offset(inode));
2017 } else {
2018 aed = (struct allocExtDesc *)epos->bh->b_data;
2019 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2020 epos->offset - sizeof(struct allocExtDesc));
2021 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1da177e4
LT		 2022 }
2023
7e49b6f2 2024 udf_write_aext(inode, epos, eloc, elen, inc);
1da177e4 2025
cb00ea35 2026 if (!epos->bh) {
48d6d8ff 2027 iinfo->i_lenAlloc += adsize;
1da177e4 2028 mark_inode_dirty(inode);
cb00ea35 2029 } else {
ff116fc8 2030 aed = (struct allocExtDesc *)epos->bh->b_data;
c2104fda 2031 le32_add_cpu(&aed->lengthAllocDescs, adsize);
4b11111a
MS		 2032 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2033 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2034 udf_update_tag(epos->bh->b_data,
2035 epos->offset + (inc ? 0 : adsize));
1da177e4 2036 else
4b11111a
MS		 2037 udf_update_tag(epos->bh->b_data,
2038 sizeof(struct allocExtDesc));
ff116fc8 2039 mark_buffer_dirty_inode(epos->bh, inode);
1da177e4
LT		 2040 }
2041
7e49b6f2 2042 return 0;
1da177e4
LT		 2043}
2044
fcea62ba
JK		 2045/*
2046 * Append extent at given position - should be the first free one in inode
2047 * / indirect extent. Takes care of allocating and linking indirect blocks.
2048 */
2049int udf_add_aext(struct inode *inode, struct extent_position *epos,
2050 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2051{
2052 int adsize;
2053 struct super_block *sb = inode->i_sb;
2054
2055 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2056 adsize = sizeof(struct short_ad);
2057 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2058 adsize = sizeof(struct long_ad);
2059 else
2060 return -EIO;
2061
2062 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2063 int err;
b490bdd6 2064 udf_pblk_t new_block;
fcea62ba
JK		 2065
2066 new_block = udf_new_block(sb, NULL,
2067 epos->block.partitionReferenceNum,
2068 epos->block.logicalBlockNum, &err);
2069 if (!new_block)
2070 return -ENOSPC;
2071
2072 err = udf_setup_indirect_aext(inode, new_block, epos);
2073 if (err)
2074 return err;
2075 }
2076
2077 return __udf_add_aext(inode, epos, eloc, elen, inc);
2078}
2079
7e49b6f2
JK		 2080void udf_write_aext(struct inode *inode, struct extent_position *epos,
2081 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1da177e4
LT		 2082{
2083 int adsize;
2084 uint8_t *ptr;
5ca4e4be
PE		 2085 struct short_ad *sad;
2086 struct long_ad *lad;
48d6d8ff 2087 struct udf_inode_info *iinfo = UDF_I(inode);
1da177e4 2088
ff116fc8 2089 if (!epos->bh)
48d6d8ff 2090 ptr = iinfo->i_ext.i_data + epos->offset -
4b11111a 2091 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2092 iinfo->i_lenEAttr;
1da177e4 2093 else
ff116fc8 2094 ptr = epos->bh->b_data + epos->offset;
1da177e4 2095
48d6d8ff 2096 switch (iinfo->i_alloc_type) {
cb00ea35 2097 case ICBTAG_FLAG_AD_SHORT:
5ca4e4be 2098 sad = (struct short_ad *)ptr;
28de7948 2099 sad->extLength = cpu_to_le32(elen);
97e961fd 2100 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
5ca4e4be 2101 adsize = sizeof(struct short_ad);
28de7948 2102 break;
cb00ea35 2103 case ICBTAG_FLAG_AD_LONG:
5ca4e4be 2104 lad = (struct long_ad *)ptr;
28de7948 2105 lad->extLength = cpu_to_le32(elen);
97e961fd 2106 lad->extLocation = cpu_to_lelb(*eloc);
28de7948 2107 memset(lad->impUse, 0x00, sizeof(lad->impUse));
5ca4e4be 2108 adsize = sizeof(struct long_ad);
28de7948 2109 break;
cb00ea35 2110 default:
7e49b6f2 2111 return;
1da177e4
LT		 2112 }
2113
cb00ea35 2114 if (epos->bh) {
28de7948 2115 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2116 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
4b11111a
MS		 2117 struct allocExtDesc *aed =
2118 (struct allocExtDesc *)epos->bh->b_data;
ff116fc8 2119 udf_update_tag(epos->bh->b_data,
4b11111a
MS		 2120 le32_to_cpu(aed->lengthAllocDescs) +
2121 sizeof(struct allocExtDesc));
1da177e4 2122 }
ff116fc8 2123 mark_buffer_dirty_inode(epos->bh, inode);
28de7948 2124 } else {
1da177e4 2125 mark_inode_dirty(inode);
28de7948 2126 }
1da177e4
LT		 2127
2128 if (inc)
ff116fc8 2129 epos->offset += adsize;
1da177e4
LT		 2130}
2131
b0918d9f
VN		 2132/*
2133 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2134 * someone does some weird stuff.
2135 */
2136#define UDF_MAX_INDIR_EXTS 16
2137
4b11111a 2138int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2139 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2140{
2141 int8_t etype;
b0918d9f 2142 unsigned int indirections = 0;
1da177e4 2143
ff116fc8 2144 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
800552ce 2145 (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
b490bdd6 2146 udf_pblk_t block;
b0918d9f
VN		 2147
2148 if (++indirections > UDF_MAX_INDIR_EXTS) {
2149 udf_err(inode->i_sb,
2150 "too many indirect extents in inode %lu\n",
2151 inode->i_ino);
2152 return -1;
2153 }
2154
ff116fc8
JK		 2155 epos->block = *eloc;
2156 epos->offset = sizeof(struct allocExtDesc);
3bf25cb4 2157 brelse(epos->bh);
97e961fd 2158 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
4b11111a
MS		 2159 epos->bh = udf_tread(inode->i_sb, block);
2160 if (!epos->bh) {
fcbf7637 2161 udf_debug("reading block %u failed!\n", block);
1da177e4
LT		 2162 return -1;
2163 }
2164 }
2165
2166 return etype;
2167}
2168
4b11111a 2169int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
5ca4e4be 2170 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1da177e4
LT		 2171{
2172 int alen;
2173 int8_t etype;
2174 uint8_t *ptr;
5ca4e4be
PE		 2175 struct short_ad *sad;
2176 struct long_ad *lad;
48d6d8ff 2177 struct udf_inode_info *iinfo = UDF_I(inode);
28de7948 2178
cb00ea35 2179 if (!epos->bh) {
ff116fc8
JK		 2180 if (!epos->offset)
2181 epos->offset = udf_file_entry_alloc_offset(inode);
48d6d8ff 2182 ptr = iinfo->i_ext.i_data + epos->offset -
4b11111a 2183 udf_file_entry_alloc_offset(inode) +
48d6d8ff 2184 iinfo->i_lenEAttr;
4b11111a 2185 alen = udf_file_entry_alloc_offset(inode) +
48d6d8ff 2186 iinfo->i_lenAlloc;
cb00ea35 2187 } else {
ff116fc8
JK		 2188 if (!epos->offset)
2189 epos->offset = sizeof(struct allocExtDesc);
2190 ptr = epos->bh->b_data + epos->offset;
28de7948 2191 alen = sizeof(struct allocExtDesc) +
4b11111a
MS		 2192 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2193 lengthAllocDescs);
1da177e4
LT		 2194 }
2195
48d6d8ff 2196 switch (iinfo->i_alloc_type) {
cb00ea35 2197 case ICBTAG_FLAG_AD_SHORT:
4b11111a
MS		 2198 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2199 if (!sad)
28de7948
CG		 2200 return -1;
2201 etype = le32_to_cpu(sad->extLength) >> 30;
2202 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
4b11111a 2203 eloc->partitionReferenceNum =
48d6d8ff 2204 iinfo->i_location.partitionReferenceNum;
28de7948
CG		 2205 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2206 break;
cb00ea35 2207 case ICBTAG_FLAG_AD_LONG:
4b11111a
MS		 2208 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2209 if (!lad)
1da177e4 2210 return -1;
28de7948
CG		 2211 etype = le32_to_cpu(lad->extLength) >> 30;
2212 *eloc = lelb_to_cpu(lad->extLocation);
2213 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2214 break;
2215 default:
fcbf7637 2216 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
28de7948 2217 return -1;
1da177e4
LT		 2218 }
2219
2220 return etype;
2221}
2222
28de7948 2223static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
5ca4e4be 2224 struct kernel_lb_addr neloc, uint32_t nelen)
1da177e4 2225{
5ca4e4be 2226 struct kernel_lb_addr oeloc;
1da177e4
LT		 2227 uint32_t oelen;
2228 int8_t etype;
2229
ff116fc8 2230 if (epos.bh)
3bf25cb4 2231 get_bh(epos.bh);
1da177e4 2232
cb00ea35 2233 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
97e961fd 2234 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1da177e4
LT		 2235 neloc = oeloc;
2236 nelen = (etype << 30) | oelen;
2237 }
97e961fd 2238 udf_add_aext(inode, &epos, &neloc, nelen, 1);
3bf25cb4 2239 brelse(epos.bh);
28de7948 2240
1da177e4
LT		 2241 return (nelen >> 30);
2242}
2243
6c1e4d06 2244int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
1da177e4 2245{
ff116fc8
JK		 2246 struct extent_position oepos;
2247 int adsize;
1da177e4
LT		 2248 int8_t etype;
2249 struct allocExtDesc *aed;
48d6d8ff 2250 struct udf_inode_info *iinfo;
6c1e4d06
JK		 2251 struct kernel_lb_addr eloc;
2252 uint32_t elen;
1da177e4 2253
cb00ea35 2254 if (epos.bh) {
3bf25cb4
JK		 2255 get_bh(epos.bh);
2256 get_bh(epos.bh);
1da177e4
LT		 2257 }
2258
48d6d8ff
MS		 2259 iinfo = UDF_I(inode);
2260 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
5ca4e4be 2261 adsize = sizeof(struct short_ad);
48d6d8ff 2262 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
5ca4e4be 2263 adsize = sizeof(struct long_ad);
1da177e4
LT		 2264 else
2265 adsize = 0;
2266
ff116fc8
JK		 2267 oepos = epos;
2268 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1da177e4
LT		 2269 return -1;
2270
cb00ea35 2271 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
97e961fd 2272 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
cb00ea35 2273 if (oepos.bh != epos.bh) {
ff116fc8 2274 oepos.block = epos.block;
3bf25cb4
JK		 2275 brelse(oepos.bh);
2276 get_bh(epos.bh);
ff116fc8
JK		 2277 oepos.bh = epos.bh;
2278 oepos.offset = epos.offset - adsize;
1da177e4
LT		 2279 }
2280 }
5ca4e4be 2281 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1da177e4
LT		 2282 elen = 0;
2283
cb00ea35 2284 if (epos.bh != oepos.bh) {
97e961fd
PE		 2285 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2286 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2287 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2288 if (!oepos.bh) {
48d6d8ff 2289 iinfo->i_lenAlloc -= (adsize * 2);
1da177e4 2290 mark_inode_dirty(inode);
cb00ea35 2291 } else {
ff116fc8 2292 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2293 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
28de7948 2294 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2295 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2296 udf_update_tag(oepos.bh->b_data,
2297 oepos.offset - (2 * adsize));
1da177e4 2298 else
4b11111a
MS		 2299 udf_update_tag(oepos.bh->b_data,
2300 sizeof(struct allocExtDesc));
ff116fc8 2301 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4 2302 }
cb00ea35 2303 } else {
97e961fd 2304 udf_write_aext(inode, &oepos, &eloc, elen, 1);
cb00ea35 2305 if (!oepos.bh) {
48d6d8ff 2306 iinfo->i_lenAlloc -= adsize;
1da177e4 2307 mark_inode_dirty(inode);
cb00ea35 2308 } else {
ff116fc8 2309 aed = (struct allocExtDesc *)oepos.bh->b_data;
c2104fda 2310 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
28de7948 2311 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
6c79e987 2312 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
4b11111a
MS		 2313 udf_update_tag(oepos.bh->b_data,
2314 epos.offset - adsize);
1da177e4 2315 else
4b11111a
MS		 2316 udf_update_tag(oepos.bh->b_data,
2317 sizeof(struct allocExtDesc));
ff116fc8 2318 mark_buffer_dirty_inode(oepos.bh, inode);
1da177e4
LT		 2319 }
2320 }
647bd61a 2321
3bf25cb4
JK		 2322 brelse(epos.bh);
2323 brelse(oepos.bh);
28de7948 2324
1da177e4
LT		 2325 return (elen >> 30);
2326}
2327
4b11111a 2328int8_t inode_bmap(struct inode *inode, sector_t block,
5ca4e4be 2329 struct extent_position *pos, struct kernel_lb_addr *eloc,
4b11111a 2330 uint32_t *elen, sector_t *offset)
1da177e4 2331{
4b11111a 2332 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
bbc9abd2 2333 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
1da177e4 2334 int8_t etype;
48d6d8ff 2335 struct udf_inode_info *iinfo;
1da177e4 2336
48d6d8ff 2337 iinfo = UDF_I(inode);
99600051
NJ		 2338 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2339 pos->offset = 0;
2340 pos->block = iinfo->i_location;
2341 pos->bh = NULL;
2342 }
1da177e4 2343 *elen = 0;
cb00ea35 2344 do {
4b11111a
MS		 2345 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2346 if (etype == -1) {
2347 *offset = (bcount - lbcount) >> blocksize_bits;
48d6d8ff 2348 iinfo->i_lenExtents = lbcount;
1da177e4
LT		 2349 return -1;
2350 }
2351 lbcount += *elen;
2352 } while (lbcount <= bcount);
99600051 2353 /* update extent cache */
b31c9ed9 2354 udf_update_extent_cache(inode, lbcount - *elen, pos);
4b11111a 2355 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
1da177e4
LT		 2356
2357 return etype;
2358}
2359
b490bdd6 2360udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
1da177e4 2361{
5ca4e4be 2362 struct kernel_lb_addr eloc;
ff116fc8 2363 uint32_t elen;
60448b1d 2364 sector_t offset;
28de7948 2365 struct extent_position epos = {};
b490bdd6 2366 udf_pblk_t ret;
1da177e4 2367
4d0fb621 2368 down_read(&UDF_I(inode)->i_data_sem);
1da177e4 2369
4b11111a
MS		 2370 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2371 (EXT_RECORDED_ALLOCATED >> 30))
97e961fd 2372 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
1da177e4
LT		 2373 else
2374 ret = 0;
2375
4d0fb621 2376 up_read(&UDF_I(inode)->i_data_sem);
3bf25cb4 2377 brelse(epos.bh);
1da177e4
LT		 2378
2379 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2380 return udf_fixed_to_variable(ret);
2381 else
2382 return ret;
2383}
Linux 6.x block layer and io_uring tree(s)