5 * Inode handling routines for the OSTA-UDF(tm) filesystem.
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.
13 * (C) 1998 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
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
22 * 12/06/98 blf partition support in udf_iget, udf_block_map
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 #
34 #include <linux/module.h>
35 #include <linux/pagemap.h>
36 #include <linux/writeback.h>
37 #include <linux/slab.h>
38 #include <linux/crc-itu-t.h>
39 #include <linux/mpage.h>
40 #include <linux/uio.h>
41 #include <linux/bio.h>
46 #define EXTENT_MERGE_SIZE 5
48 static umode_t udf_convert_permissions(struct fileEntry *);
49 static int udf_update_inode(struct inode *, int);
50 static int udf_sync_inode(struct inode *inode);
51 static int udf_alloc_i_data(struct inode *inode, size_t size);
52 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
53 static int8_t udf_insert_aext(struct inode *, struct extent_position,
54 struct kernel_lb_addr, uint32_t);
55 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
56 struct kernel_long_ad *, int *);
57 static void udf_prealloc_extents(struct inode *, int, int,
58 struct kernel_long_ad *, int *);
59 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
60 static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
61 int, struct extent_position *);
62 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
64 static void __udf_clear_extent_cache(struct inode *inode)
66 struct udf_inode_info *iinfo = UDF_I(inode);
68 if (iinfo->cached_extent.lstart != -1) {
69 brelse(iinfo->cached_extent.epos.bh);
70 iinfo->cached_extent.lstart = -1;
74 /* Invalidate extent cache */
75 static void udf_clear_extent_cache(struct inode *inode)
77 struct udf_inode_info *iinfo = UDF_I(inode);
79 spin_lock(&iinfo->i_extent_cache_lock);
80 __udf_clear_extent_cache(inode);
81 spin_unlock(&iinfo->i_extent_cache_lock);
84 /* Return contents of extent cache */
85 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
86 loff_t *lbcount, struct extent_position *pos)
88 struct udf_inode_info *iinfo = UDF_I(inode);
91 spin_lock(&iinfo->i_extent_cache_lock);
92 if ((iinfo->cached_extent.lstart <= bcount) &&
93 (iinfo->cached_extent.lstart != -1)) {
95 *lbcount = iinfo->cached_extent.lstart;
96 memcpy(pos, &iinfo->cached_extent.epos,
97 sizeof(struct extent_position));
102 spin_unlock(&iinfo->i_extent_cache_lock);
106 /* Add extent to extent cache */
107 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
108 struct extent_position *pos)
110 struct udf_inode_info *iinfo = UDF_I(inode);
112 spin_lock(&iinfo->i_extent_cache_lock);
113 /* Invalidate previously cached extent */
114 __udf_clear_extent_cache(inode);
117 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
118 iinfo->cached_extent.lstart = estart;
119 switch (iinfo->i_alloc_type) {
120 case ICBTAG_FLAG_AD_SHORT:
121 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
123 case ICBTAG_FLAG_AD_LONG:
124 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
127 spin_unlock(&iinfo->i_extent_cache_lock);
130 void udf_evict_inode(struct inode *inode)
132 struct udf_inode_info *iinfo = UDF_I(inode);
135 if (!is_bad_inode(inode)) {
136 if (!inode->i_nlink) {
138 udf_setsize(inode, 0);
139 udf_update_inode(inode, IS_SYNC(inode));
141 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
142 inode->i_size != iinfo->i_lenExtents) {
143 udf_warn(inode->i_sb,
144 "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
145 inode->i_ino, inode->i_mode,
146 (unsigned long long)inode->i_size,
147 (unsigned long long)iinfo->i_lenExtents);
150 truncate_inode_pages_final(&inode->i_data);
151 invalidate_inode_buffers(inode);
153 kfree(iinfo->i_ext.i_data);
154 iinfo->i_ext.i_data = NULL;
155 udf_clear_extent_cache(inode);
157 udf_free_inode(inode);
161 static void udf_write_failed(struct address_space *mapping, loff_t to)
163 struct inode *inode = mapping->host;
164 struct udf_inode_info *iinfo = UDF_I(inode);
165 loff_t isize = inode->i_size;
168 truncate_pagecache(inode, isize);
169 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
170 down_write(&iinfo->i_data_sem);
171 udf_clear_extent_cache(inode);
172 udf_truncate_extents(inode);
173 up_write(&iinfo->i_data_sem);
178 static int udf_writepage(struct page *page, struct writeback_control *wbc)
180 return block_write_full_page(page, udf_get_block, wbc);
183 static int udf_writepages(struct address_space *mapping,
184 struct writeback_control *wbc)
186 return mpage_writepages(mapping, wbc, udf_get_block);
189 static int udf_readpage(struct file *file, struct page *page)
191 return mpage_readpage(page, udf_get_block);
194 static int udf_readpages(struct file *file, struct address_space *mapping,
195 struct list_head *pages, unsigned nr_pages)
197 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
200 static int udf_write_begin(struct file *file, struct address_space *mapping,
201 loff_t pos, unsigned len, unsigned flags,
202 struct page **pagep, void **fsdata)
206 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
208 udf_write_failed(mapping, pos + len);
212 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
214 struct file *file = iocb->ki_filp;
215 struct address_space *mapping = file->f_mapping;
216 struct inode *inode = mapping->host;
217 size_t count = iov_iter_count(iter);
220 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
221 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
222 udf_write_failed(mapping, iocb->ki_pos + count);
226 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
228 return generic_block_bmap(mapping, block, udf_get_block);
231 const struct address_space_operations udf_aops = {
232 .readpage = udf_readpage,
233 .readpages = udf_readpages,
234 .writepage = udf_writepage,
235 .writepages = udf_writepages,
236 .write_begin = udf_write_begin,
237 .write_end = generic_write_end,
238 .direct_IO = udf_direct_IO,
243 * Expand file stored in ICB to a normal one-block-file
245 * This function requires i_data_sem for writing and releases it.
246 * This function requires i_mutex held
248 int udf_expand_file_adinicb(struct inode *inode)
252 struct udf_inode_info *iinfo = UDF_I(inode);
254 struct writeback_control udf_wbc = {
255 .sync_mode = WB_SYNC_NONE,
259 WARN_ON_ONCE(!inode_is_locked(inode));
260 if (!iinfo->i_lenAlloc) {
261 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
262 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
264 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
265 /* from now on we have normal address_space methods */
266 inode->i_data.a_ops = &udf_aops;
267 up_write(&iinfo->i_data_sem);
268 mark_inode_dirty(inode);
272 * Release i_data_sem so that we can lock a page - page lock ranks
273 * above i_data_sem. i_mutex still protects us against file changes.
275 up_write(&iinfo->i_data_sem);
277 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
281 if (!PageUptodate(page)) {
282 kaddr = kmap_atomic(page);
283 memset(kaddr + iinfo->i_lenAlloc, 0x00,
284 PAGE_SIZE - iinfo->i_lenAlloc);
285 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
287 flush_dcache_page(page);
288 SetPageUptodate(page);
289 kunmap_atomic(kaddr);
291 down_write(&iinfo->i_data_sem);
292 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
294 iinfo->i_lenAlloc = 0;
295 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
296 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
298 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
299 /* from now on we have normal address_space methods */
300 inode->i_data.a_ops = &udf_aops;
301 up_write(&iinfo->i_data_sem);
302 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
304 /* Restore everything back so that we don't lose data... */
306 down_write(&iinfo->i_data_sem);
307 kaddr = kmap_atomic(page);
308 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
310 kunmap_atomic(kaddr);
312 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
313 inode->i_data.a_ops = &udf_adinicb_aops;
314 up_write(&iinfo->i_data_sem);
317 mark_inode_dirty(inode);
322 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
323 udf_pblk_t *block, int *err)
326 struct buffer_head *dbh = NULL;
327 struct kernel_lb_addr eloc;
329 struct extent_position epos;
331 struct udf_fileident_bh sfibh, dfibh;
332 loff_t f_pos = udf_ext0_offset(inode);
333 int size = udf_ext0_offset(inode) + inode->i_size;
334 struct fileIdentDesc cfi, *sfi, *dfi;
335 struct udf_inode_info *iinfo = UDF_I(inode);
337 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
338 alloctype = ICBTAG_FLAG_AD_SHORT;
340 alloctype = ICBTAG_FLAG_AD_LONG;
342 if (!inode->i_size) {
343 iinfo->i_alloc_type = alloctype;
344 mark_inode_dirty(inode);
348 /* alloc block, and copy data to it */
349 *block = udf_new_block(inode->i_sb, inode,
350 iinfo->i_location.partitionReferenceNum,
351 iinfo->i_location.logicalBlockNum, err);
354 newblock = udf_get_pblock(inode->i_sb, *block,
355 iinfo->i_location.partitionReferenceNum,
359 dbh = udf_tgetblk(inode->i_sb, newblock);
363 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
364 set_buffer_uptodate(dbh);
366 mark_buffer_dirty_inode(dbh, inode);
368 sfibh.soffset = sfibh.eoffset =
369 f_pos & (inode->i_sb->s_blocksize - 1);
370 sfibh.sbh = sfibh.ebh = NULL;
371 dfibh.soffset = dfibh.eoffset = 0;
372 dfibh.sbh = dfibh.ebh = dbh;
373 while (f_pos < size) {
374 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
375 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
381 iinfo->i_alloc_type = alloctype;
382 sfi->descTag.tagLocation = cpu_to_le32(*block);
383 dfibh.soffset = dfibh.eoffset;
384 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
385 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
386 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
388 le16_to_cpu(sfi->lengthOfImpUse))) {
389 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
394 mark_buffer_dirty_inode(dbh, inode);
396 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
398 iinfo->i_lenAlloc = 0;
399 eloc.logicalBlockNum = *block;
400 eloc.partitionReferenceNum =
401 iinfo->i_location.partitionReferenceNum;
402 iinfo->i_lenExtents = inode->i_size;
404 epos.block = iinfo->i_location;
405 epos.offset = udf_file_entry_alloc_offset(inode);
406 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
410 mark_inode_dirty(inode);
414 static int udf_get_block(struct inode *inode, sector_t block,
415 struct buffer_head *bh_result, int create)
419 struct udf_inode_info *iinfo;
422 phys = udf_block_map(inode, block);
424 map_bh(bh_result, inode->i_sb, phys);
430 iinfo = UDF_I(inode);
432 down_write(&iinfo->i_data_sem);
433 if (block == iinfo->i_next_alloc_block + 1) {
434 iinfo->i_next_alloc_block++;
435 iinfo->i_next_alloc_goal++;
438 udf_clear_extent_cache(inode);
439 phys = inode_getblk(inode, block, &err, &new);
444 set_buffer_new(bh_result);
445 map_bh(bh_result, inode->i_sb, phys);
448 up_write(&iinfo->i_data_sem);
452 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
453 int create, int *err)
455 struct buffer_head *bh;
456 struct buffer_head dummy;
459 dummy.b_blocknr = -1000;
460 *err = udf_get_block(inode, block, &dummy, create);
461 if (!*err && buffer_mapped(&dummy)) {
462 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
463 if (buffer_new(&dummy)) {
465 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
466 set_buffer_uptodate(bh);
468 mark_buffer_dirty_inode(bh, inode);
476 /* Extend the file with new blocks totaling 'new_block_bytes',
477 * return the number of extents added
479 static int udf_do_extend_file(struct inode *inode,
480 struct extent_position *last_pos,
481 struct kernel_long_ad *last_ext,
482 loff_t new_block_bytes)
485 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
486 struct super_block *sb = inode->i_sb;
487 struct kernel_lb_addr prealloc_loc = {};
488 uint32_t prealloc_len = 0;
489 struct udf_inode_info *iinfo;
492 /* The previous extent is fake and we should not extend by anything
493 * - there's nothing to do... */
494 if (!new_block_bytes && fake)
497 iinfo = UDF_I(inode);
498 /* Round the last extent up to a multiple of block size */
499 if (last_ext->extLength & (sb->s_blocksize - 1)) {
500 last_ext->extLength =
501 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
502 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
503 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
504 iinfo->i_lenExtents =
505 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
506 ~(sb->s_blocksize - 1);
509 /* Last extent are just preallocated blocks? */
510 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
511 EXT_NOT_RECORDED_ALLOCATED) {
512 /* Save the extent so that we can reattach it to the end */
513 prealloc_loc = last_ext->extLocation;
514 prealloc_len = last_ext->extLength;
515 /* Mark the extent as a hole */
516 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
517 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
518 last_ext->extLocation.logicalBlockNum = 0;
519 last_ext->extLocation.partitionReferenceNum = 0;
522 /* Can we merge with the previous extent? */
523 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
524 EXT_NOT_RECORDED_NOT_ALLOCATED) {
525 add = (1 << 30) - sb->s_blocksize -
526 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
527 if (add > new_block_bytes)
528 add = new_block_bytes;
529 new_block_bytes -= add;
530 last_ext->extLength += add;
534 udf_add_aext(inode, last_pos, &last_ext->extLocation,
535 last_ext->extLength, 1);
538 struct kernel_lb_addr tmploc;
541 udf_write_aext(inode, last_pos, &last_ext->extLocation,
542 last_ext->extLength, 1);
545 * We've rewritten the last extent. If we are going to add
546 * more extents, we may need to enter possible following
547 * empty indirect extent.
549 if (new_block_bytes || prealloc_len)
550 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
553 /* Managed to do everything necessary? */
554 if (!new_block_bytes)
557 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
558 last_ext->extLocation.logicalBlockNum = 0;
559 last_ext->extLocation.partitionReferenceNum = 0;
560 add = (1 << 30) - sb->s_blocksize;
561 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
563 /* Create enough extents to cover the whole hole */
564 while (new_block_bytes > add) {
565 new_block_bytes -= add;
566 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
567 last_ext->extLength, 1);
572 if (new_block_bytes) {
573 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
575 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
576 last_ext->extLength, 1);
583 /* Do we have some preallocated blocks saved? */
585 err = udf_add_aext(inode, last_pos, &prealloc_loc,
589 last_ext->extLocation = prealloc_loc;
590 last_ext->extLength = prealloc_len;
594 /* last_pos should point to the last written extent... */
595 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
596 last_pos->offset -= sizeof(struct short_ad);
597 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
598 last_pos->offset -= sizeof(struct long_ad);
605 /* Extend the final block of the file to final_block_len bytes */
606 static 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)
611 struct super_block *sb = inode->i_sb;
612 uint32_t added_bytes;
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;
619 udf_write_aext(inode, last_pos, &last_ext->extLocation,
620 last_ext->extLength, 1);
623 static int udf_extend_file(struct inode *inode, loff_t newsize)
626 struct extent_position epos;
627 struct kernel_lb_addr eloc;
630 struct super_block *sb = inode->i_sb;
631 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
632 unsigned long partial_final_block;
634 struct udf_inode_info *iinfo = UDF_I(inode);
635 struct kernel_long_ad extent;
637 int within_final_block;
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);
646 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
647 within_final_block = (etype != -1);
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;
657 epos.offset -= adsize;
658 etype = udf_next_aext(inode, &epos, &extent.extLocation,
659 &extent.extLength, 0);
660 extent.extLength |= etype << 30;
663 partial_final_block = newsize & (sb->s_blocksize - 1);
665 /* File has extent covering the new size (could happen when extending
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);
673 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
675 err = udf_do_extend_file(inode, &epos, &extent, add);
681 iinfo->i_lenExtents = newsize;
687 static sector_t inode_getblk(struct inode *inode, sector_t block,
690 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
691 struct extent_position prev_epos, cur_epos, next_epos;
692 int count = 0, startnum = 0, endnum = 0;
693 uint32_t elen = 0, tmpelen;
694 struct kernel_lb_addr eloc, tmpeloc;
696 loff_t lbcount = 0, b_off = 0;
697 udf_pblk_t newblocknum, newblock;
700 struct udf_inode_info *iinfo = UDF_I(inode);
701 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
707 prev_epos.offset = udf_file_entry_alloc_offset(inode);
708 prev_epos.block = iinfo->i_location;
710 cur_epos = next_epos = prev_epos;
711 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
713 /* find the extent which contains the block we are looking for.
714 alternate between laarr[0] and laarr[1] for locations of the
715 current extent, and the previous extent */
717 if (prev_epos.bh != cur_epos.bh) {
718 brelse(prev_epos.bh);
720 prev_epos.bh = cur_epos.bh;
722 if (cur_epos.bh != next_epos.bh) {
724 get_bh(next_epos.bh);
725 cur_epos.bh = next_epos.bh;
730 prev_epos.block = cur_epos.block;
731 cur_epos.block = next_epos.block;
733 prev_epos.offset = cur_epos.offset;
734 cur_epos.offset = next_epos.offset;
736 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
742 laarr[c].extLength = (etype << 30) | elen;
743 laarr[c].extLocation = eloc;
745 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
746 pgoal = eloc.logicalBlockNum +
747 ((elen + inode->i_sb->s_blocksize - 1) >>
748 inode->i_sb->s_blocksize_bits);
751 } while (lbcount + elen <= b_off);
754 offset = b_off >> inode->i_sb->s_blocksize_bits;
756 * Move prev_epos and cur_epos into indirect extent if we are at
759 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
760 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
762 /* if the extent is allocated and recorded, return the block
763 if the extent is not a multiple of the blocksize, round up */
765 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
766 if (elen & (inode->i_sb->s_blocksize - 1)) {
767 elen = EXT_RECORDED_ALLOCATED |
768 ((elen + inode->i_sb->s_blocksize - 1) &
769 ~(inode->i_sb->s_blocksize - 1));
770 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
772 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
776 /* Are we beyond EOF? */
786 /* Create a fake extent when there's not one */
787 memset(&laarr[0].extLocation, 0x00,
788 sizeof(struct kernel_lb_addr));
789 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
790 /* Will udf_do_extend_file() create real extent from
792 startnum = (offset > 0);
794 /* Create extents for the hole between EOF and offset */
795 hole_len = (loff_t)offset << inode->i_blkbits;
796 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
805 /* We are not covered by a preallocated extent? */
806 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
807 EXT_NOT_RECORDED_ALLOCATED) {
808 /* Is there any real extent? - otherwise we overwrite
812 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
813 inode->i_sb->s_blocksize;
814 memset(&laarr[c].extLocation, 0x00,
815 sizeof(struct kernel_lb_addr));
822 endnum = startnum = ((count > 2) ? 2 : count);
824 /* if the current extent is in position 0,
825 swap it with the previous */
826 if (!c && count != 1) {
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);
837 laarr[c + 1].extLength = (etype << 30) | elen;
838 laarr[c + 1].extLocation = eloc;
846 /* if the current extent is not recorded but allocated, get the
847 * block in the extent corresponding to the requested block */
848 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
849 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
850 else { /* otherwise, allocate a new block */
851 if (iinfo->i_next_alloc_block == block)
852 goal = iinfo->i_next_alloc_goal;
855 if (!(goal = pgoal)) /* XXX: what was intended here? */
856 goal = iinfo->i_location.logicalBlockNum + 1;
859 newblocknum = udf_new_block(inode->i_sb, inode,
860 iinfo->i_location.partitionReferenceNum,
868 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
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
875 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
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);
884 /* merge any continuous blocks in laarr */
885 udf_merge_extents(inode, laarr, &endnum);
887 /* write back the new extents, inserting new extents if the new number
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 */
890 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
892 newblock = udf_get_pblock(inode->i_sb, newblocknum,
893 iinfo->i_location.partitionReferenceNum, 0);
899 iinfo->i_next_alloc_block = block;
900 iinfo->i_next_alloc_goal = newblocknum;
901 inode->i_ctime = current_time(inode);
904 udf_sync_inode(inode);
906 mark_inode_dirty(inode);
908 brelse(prev_epos.bh);
910 brelse(next_epos.bh);
914 static void udf_split_extents(struct inode *inode, int *c, int offset,
915 udf_pblk_t newblocknum,
916 struct kernel_long_ad *laarr, int *endnum)
918 unsigned long blocksize = inode->i_sb->s_blocksize;
919 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
921 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
922 (laarr[*c].extLength >> 30) ==
923 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
925 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
926 blocksize - 1) >> blocksize_bits;
927 int8_t etype = (laarr[curr].extLength >> 30);
931 else if (!offset || blen == offset + 1) {
932 laarr[curr + 2] = laarr[curr + 1];
933 laarr[curr + 1] = laarr[curr];
935 laarr[curr + 3] = laarr[curr + 1];
936 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
940 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
941 udf_free_blocks(inode->i_sb, inode,
942 &laarr[curr].extLocation,
944 laarr[curr].extLength =
945 EXT_NOT_RECORDED_NOT_ALLOCATED |
946 (offset << blocksize_bits);
947 laarr[curr].extLocation.logicalBlockNum = 0;
948 laarr[curr].extLocation.
949 partitionReferenceNum = 0;
951 laarr[curr].extLength = (etype << 30) |
952 (offset << blocksize_bits);
958 laarr[curr].extLocation.logicalBlockNum = newblocknum;
959 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
960 laarr[curr].extLocation.partitionReferenceNum =
961 UDF_I(inode)->i_location.partitionReferenceNum;
962 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
966 if (blen != offset + 1) {
967 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
968 laarr[curr].extLocation.logicalBlockNum +=
970 laarr[curr].extLength = (etype << 30) |
971 ((blen - (offset + 1)) << blocksize_bits);
978 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
979 struct kernel_long_ad *laarr,
982 int start, length = 0, currlength = 0, i;
984 if (*endnum >= (c + 1)) {
990 if ((laarr[c + 1].extLength >> 30) ==
991 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
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);
1002 for (i = start + 1; i <= *endnum; i++) {
1005 length += UDF_DEFAULT_PREALLOC_BLOCKS;
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);
1017 int next = laarr[start].extLocation.logicalBlockNum +
1018 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1019 inode->i_sb->s_blocksize - 1) >>
1020 inode->i_sb->s_blocksize_bits);
1021 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1022 laarr[start].extLocation.partitionReferenceNum,
1023 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1024 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1027 if (start == (c + 1))
1028 laarr[start].extLength +=
1030 inode->i_sb->s_blocksize_bits);
1032 memmove(&laarr[c + 2], &laarr[c + 1],
1033 sizeof(struct long_ad) * (*endnum - (c + 1)));
1035 laarr[c + 1].extLocation.logicalBlockNum = next;
1036 laarr[c + 1].extLocation.partitionReferenceNum =
1037 laarr[c].extLocation.
1038 partitionReferenceNum;
1039 laarr[c + 1].extLength =
1040 EXT_NOT_RECORDED_ALLOCATED |
1042 inode->i_sb->s_blocksize_bits);
1046 for (i = start + 1; numalloc && i < *endnum; i++) {
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;
1052 if (elen > numalloc) {
1053 laarr[i].extLength -=
1055 inode->i_sb->s_blocksize_bits);
1059 if (*endnum > (i + 1))
1062 sizeof(struct long_ad) *
1063 (*endnum - (i + 1)));
1068 UDF_I(inode)->i_lenExtents +=
1069 numalloc << inode->i_sb->s_blocksize_bits;
1074 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1078 unsigned long blocksize = inode->i_sb->s_blocksize;
1079 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1081 for (i = 0; i < (*endnum - 1); i++) {
1082 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1083 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
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)))) {
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 -
1098 UDF_EXTENT_LENGTH_MASK) +
1099 UDF_EXTENT_LENGTH_MASK) &
1101 li->extLength = (li->extLength &
1102 UDF_EXTENT_FLAG_MASK) +
1103 (UDF_EXTENT_LENGTH_MASK + 1) -
1105 lip1->extLocation.logicalBlockNum =
1106 li->extLocation.logicalBlockNum +
1108 UDF_EXTENT_LENGTH_MASK) >>
1111 li->extLength = lip1->extLength +
1113 UDF_EXTENT_LENGTH_MASK) +
1114 blocksize - 1) & ~(blocksize - 1));
1115 if (*endnum > (i + 2))
1116 memmove(&laarr[i + 1], &laarr[i + 2],
1117 sizeof(struct long_ad) *
1118 (*endnum - (i + 2)));
1122 } else if (((li->extLength >> 30) ==
1123 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1124 ((lip1->extLength >> 30) ==
1125 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1126 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1128 UDF_EXTENT_LENGTH_MASK) +
1129 blocksize - 1) >> blocksize_bits);
1130 li->extLocation.logicalBlockNum = 0;
1131 li->extLocation.partitionReferenceNum = 0;
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 -
1138 UDF_EXTENT_LENGTH_MASK) +
1139 UDF_EXTENT_LENGTH_MASK) &
1141 li->extLength = (li->extLength &
1142 UDF_EXTENT_FLAG_MASK) +
1143 (UDF_EXTENT_LENGTH_MASK + 1) -
1146 li->extLength = lip1->extLength +
1148 UDF_EXTENT_LENGTH_MASK) +
1149 blocksize - 1) & ~(blocksize - 1));
1150 if (*endnum > (i + 2))
1151 memmove(&laarr[i + 1], &laarr[i + 2],
1152 sizeof(struct long_ad) *
1153 (*endnum - (i + 2)));
1157 } else if ((li->extLength >> 30) ==
1158 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1159 udf_free_blocks(inode->i_sb, inode,
1160 &li->extLocation, 0,
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;
1173 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1174 int startnum, int endnum,
1175 struct extent_position *epos)
1178 struct kernel_lb_addr tmploc;
1181 if (startnum > endnum) {
1182 for (i = 0; i < (startnum - endnum); i++)
1183 udf_delete_aext(inode, *epos);
1184 } else if (startnum < endnum) {
1185 for (i = 0; i < (endnum - startnum); i++) {
1186 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1187 laarr[i].extLength);
1188 udf_next_aext(inode, epos, &laarr[i].extLocation,
1189 &laarr[i].extLength, 1);
1194 for (i = start; i < endnum; i++) {
1195 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1196 udf_write_aext(inode, epos, &laarr[i].extLocation,
1197 laarr[i].extLength, 1);
1201 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1202 int create, int *err)
1204 struct buffer_head *bh = NULL;
1206 bh = udf_getblk(inode, block, create, err);
1210 if (buffer_uptodate(bh))
1213 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1216 if (buffer_uptodate(bh))
1224 int udf_setsize(struct inode *inode, loff_t newsize)
1227 struct udf_inode_info *iinfo;
1228 unsigned int bsize = i_blocksize(inode);
1230 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1231 S_ISLNK(inode->i_mode)))
1233 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1236 iinfo = UDF_I(inode);
1237 if (newsize > inode->i_size) {
1238 down_write(&iinfo->i_data_sem);
1239 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1241 (udf_file_entry_alloc_offset(inode) + newsize)) {
1242 err = udf_expand_file_adinicb(inode);
1245 down_write(&iinfo->i_data_sem);
1247 iinfo->i_lenAlloc = newsize;
1251 err = udf_extend_file(inode, newsize);
1253 up_write(&iinfo->i_data_sem);
1257 up_write(&iinfo->i_data_sem);
1258 truncate_setsize(inode, newsize);
1260 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1261 down_write(&iinfo->i_data_sem);
1262 udf_clear_extent_cache(inode);
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);
1271 err = block_truncate_page(inode->i_mapping, newsize,
1275 truncate_setsize(inode, newsize);
1276 down_write(&iinfo->i_data_sem);
1277 udf_clear_extent_cache(inode);
1278 udf_truncate_extents(inode);
1279 up_write(&iinfo->i_data_sem);
1282 inode->i_mtime = inode->i_ctime = current_time(inode);
1284 udf_sync_inode(inode);
1286 mark_inode_dirty(inode);
1291 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1292 * arbitrary - just that we hopefully don't limit any real use of rewritten
1293 * inode on write-once media but avoid looping for too long on corrupted media.
1295 #define UDF_MAX_ICB_NESTING 1024
1297 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1299 struct buffer_head *bh = NULL;
1300 struct fileEntry *fe;
1301 struct extendedFileEntry *efe;
1303 struct udf_inode_info *iinfo = UDF_I(inode);
1304 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1305 struct kernel_lb_addr *iloc = &iinfo->i_location;
1306 unsigned int link_count;
1307 unsigned int indirections = 0;
1308 int bs = inode->i_sb->s_blocksize;
1313 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1314 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1315 iloc->partitionReferenceNum, sbi->s_partitions);
1319 if (iloc->logicalBlockNum >=
1320 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1321 udf_debug("block=%u, partition=%u out of range\n",
1322 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1327 * Set defaults, but the inode is still incomplete!
1328 * Note: get_new_inode() sets the following on a new inode:
1331 * i_flags = sb->s_flags
1333 * clean_inode(): zero fills and sets
1338 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1340 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1344 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1345 ident != TAG_IDENT_USE) {
1346 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1347 inode->i_ino, ident);
1351 fe = (struct fileEntry *)bh->b_data;
1352 efe = (struct extendedFileEntry *)bh->b_data;
1354 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1355 struct buffer_head *ibh;
1357 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1358 if (ident == TAG_IDENT_IE && ibh) {
1359 struct kernel_lb_addr loc;
1360 struct indirectEntry *ie;
1362 ie = (struct indirectEntry *)ibh->b_data;
1363 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1365 if (ie->indirectICB.extLength) {
1367 memcpy(&iinfo->i_location, &loc,
1368 sizeof(struct kernel_lb_addr));
1369 if (++indirections > UDF_MAX_ICB_NESTING) {
1370 udf_err(inode->i_sb,
1371 "too many ICBs in ICB hierarchy"
1372 " (max %d supported)\n",
1373 UDF_MAX_ICB_NESTING);
1381 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1382 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1383 le16_to_cpu(fe->icbTag.strategyType));
1386 if (fe->icbTag.strategyType == cpu_to_le16(4))
1387 iinfo->i_strat4096 = 0;
1388 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1389 iinfo->i_strat4096 = 1;
1391 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1392 ICBTAG_FLAG_AD_MASK;
1393 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1394 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1395 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1399 iinfo->i_unique = 0;
1400 iinfo->i_lenEAttr = 0;
1401 iinfo->i_lenExtents = 0;
1402 iinfo->i_lenAlloc = 0;
1403 iinfo->i_next_alloc_block = 0;
1404 iinfo->i_next_alloc_goal = 0;
1405 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1408 ret = udf_alloc_i_data(inode, bs -
1409 sizeof(struct extendedFileEntry));
1412 memcpy(iinfo->i_ext.i_data,
1413 bh->b_data + sizeof(struct extendedFileEntry),
1414 bs - sizeof(struct extendedFileEntry));
1415 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1418 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1421 memcpy(iinfo->i_ext.i_data,
1422 bh->b_data + sizeof(struct fileEntry),
1423 bs - sizeof(struct fileEntry));
1424 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1427 iinfo->i_lenAlloc = le32_to_cpu(
1428 ((struct unallocSpaceEntry *)bh->b_data)->
1430 ret = udf_alloc_i_data(inode, bs -
1431 sizeof(struct unallocSpaceEntry));
1434 memcpy(iinfo->i_ext.i_data,
1435 bh->b_data + sizeof(struct unallocSpaceEntry),
1436 bs - sizeof(struct unallocSpaceEntry));
1441 read_lock(&sbi->s_cred_lock);
1442 uid = le32_to_cpu(fe->uid);
1443 if (uid == UDF_INVALID_ID ||
1444 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1445 inode->i_uid = sbi->s_uid;
1447 i_uid_write(inode, uid);
1449 gid = le32_to_cpu(fe->gid);
1450 if (gid == UDF_INVALID_ID ||
1451 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1452 inode->i_gid = sbi->s_gid;
1454 i_gid_write(inode, gid);
1456 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1457 sbi->s_fmode != UDF_INVALID_MODE)
1458 inode->i_mode = sbi->s_fmode;
1459 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1460 sbi->s_dmode != UDF_INVALID_MODE)
1461 inode->i_mode = sbi->s_dmode;
1463 inode->i_mode = udf_convert_permissions(fe);
1464 inode->i_mode &= ~sbi->s_umask;
1465 read_unlock(&sbi->s_cred_lock);
1467 link_count = le16_to_cpu(fe->fileLinkCount);
1469 if (!hidden_inode) {
1475 set_nlink(inode, link_count);
1477 inode->i_size = le64_to_cpu(fe->informationLength);
1478 iinfo->i_lenExtents = inode->i_size;
1480 if (iinfo->i_efe == 0) {
1481 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1482 (inode->i_sb->s_blocksize_bits - 9);
1484 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1485 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1486 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1488 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1489 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1490 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1491 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1493 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1494 (inode->i_sb->s_blocksize_bits - 9);
1496 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1497 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1498 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1499 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1501 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1502 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1503 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1504 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1506 inode->i_generation = iinfo->i_unique;
1509 * Sanity check length of allocation descriptors and extended attrs to
1510 * avoid integer overflows
1512 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1514 /* Now do exact checks */
1515 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1517 /* Sanity checks for files in ICB so that we don't get confused later */
1518 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1520 * For file in ICB data is stored in allocation descriptor
1521 * so sizes should match
1523 if (iinfo->i_lenAlloc != inode->i_size)
1525 /* File in ICB has to fit in there... */
1526 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1530 switch (fe->icbTag.fileType) {
1531 case ICBTAG_FILE_TYPE_DIRECTORY:
1532 inode->i_op = &udf_dir_inode_operations;
1533 inode->i_fop = &udf_dir_operations;
1534 inode->i_mode |= S_IFDIR;
1537 case ICBTAG_FILE_TYPE_REALTIME:
1538 case ICBTAG_FILE_TYPE_REGULAR:
1539 case ICBTAG_FILE_TYPE_UNDEF:
1540 case ICBTAG_FILE_TYPE_VAT20:
1541 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1542 inode->i_data.a_ops = &udf_adinicb_aops;
1544 inode->i_data.a_ops = &udf_aops;
1545 inode->i_op = &udf_file_inode_operations;
1546 inode->i_fop = &udf_file_operations;
1547 inode->i_mode |= S_IFREG;
1549 case ICBTAG_FILE_TYPE_BLOCK:
1550 inode->i_mode |= S_IFBLK;
1552 case ICBTAG_FILE_TYPE_CHAR:
1553 inode->i_mode |= S_IFCHR;
1555 case ICBTAG_FILE_TYPE_FIFO:
1556 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1558 case ICBTAG_FILE_TYPE_SOCKET:
1559 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1561 case ICBTAG_FILE_TYPE_SYMLINK:
1562 inode->i_data.a_ops = &udf_symlink_aops;
1563 inode->i_op = &udf_symlink_inode_operations;
1564 inode_nohighmem(inode);
1565 inode->i_mode = S_IFLNK | 0777;
1567 case ICBTAG_FILE_TYPE_MAIN:
1568 udf_debug("METADATA FILE-----\n");
1570 case ICBTAG_FILE_TYPE_MIRROR:
1571 udf_debug("METADATA MIRROR FILE-----\n");
1573 case ICBTAG_FILE_TYPE_BITMAP:
1574 udf_debug("METADATA BITMAP FILE-----\n");
1577 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1578 inode->i_ino, fe->icbTag.fileType);
1581 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1582 struct deviceSpec *dsea =
1583 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1585 init_special_inode(inode, inode->i_mode,
1586 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1587 le32_to_cpu(dsea->minorDeviceIdent)));
1588 /* Developer ID ??? */
1598 static int udf_alloc_i_data(struct inode *inode, size_t size)
1600 struct udf_inode_info *iinfo = UDF_I(inode);
1601 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1602 if (!iinfo->i_ext.i_data)
1607 static umode_t udf_convert_permissions(struct fileEntry *fe)
1610 uint32_t permissions;
1613 permissions = le32_to_cpu(fe->permissions);
1614 flags = le16_to_cpu(fe->icbTag.flags);
1616 mode = ((permissions) & 0007) |
1617 ((permissions >> 2) & 0070) |
1618 ((permissions >> 4) & 0700) |
1619 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1620 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1621 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1626 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1628 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1631 static int udf_sync_inode(struct inode *inode)
1633 return udf_update_inode(inode, 1);
1636 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1638 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1639 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1640 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1641 iinfo->i_crtime = time;
1644 static int udf_update_inode(struct inode *inode, int do_sync)
1646 struct buffer_head *bh = NULL;
1647 struct fileEntry *fe;
1648 struct extendedFileEntry *efe;
1649 uint64_t lb_recorded;
1654 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1655 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1656 struct udf_inode_info *iinfo = UDF_I(inode);
1658 bh = udf_tgetblk(inode->i_sb,
1659 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1661 udf_debug("getblk failure\n");
1666 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1667 fe = (struct fileEntry *)bh->b_data;
1668 efe = (struct extendedFileEntry *)bh->b_data;
1671 struct unallocSpaceEntry *use =
1672 (struct unallocSpaceEntry *)bh->b_data;
1674 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1675 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1676 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1677 sizeof(struct unallocSpaceEntry));
1678 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1679 crclen = sizeof(struct unallocSpaceEntry);
1684 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1685 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1687 fe->uid = cpu_to_le32(i_uid_read(inode));
1689 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1690 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1692 fe->gid = cpu_to_le32(i_gid_read(inode));
1694 udfperms = ((inode->i_mode & 0007)) |
1695 ((inode->i_mode & 0070) << 2) |
1696 ((inode->i_mode & 0700) << 4);
1698 udfperms |= (le32_to_cpu(fe->permissions) &
1699 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1700 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1701 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1702 fe->permissions = cpu_to_le32(udfperms);
1704 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1705 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1707 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1709 fe->informationLength = cpu_to_le64(inode->i_size);
1711 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1713 struct deviceSpec *dsea =
1714 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1716 dsea = (struct deviceSpec *)
1717 udf_add_extendedattr(inode,
1718 sizeof(struct deviceSpec) +
1719 sizeof(struct regid), 12, 0x3);
1720 dsea->attrType = cpu_to_le32(12);
1721 dsea->attrSubtype = 1;
1722 dsea->attrLength = cpu_to_le32(
1723 sizeof(struct deviceSpec) +
1724 sizeof(struct regid));
1725 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1727 eid = (struct regid *)dsea->impUse;
1728 memset(eid, 0, sizeof(*eid));
1729 strcpy(eid->ident, UDF_ID_DEVELOPER);
1730 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1731 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1732 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1733 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1736 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1737 lb_recorded = 0; /* No extents => no blocks! */
1740 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1741 (blocksize_bits - 9);
1743 if (iinfo->i_efe == 0) {
1744 memcpy(bh->b_data + sizeof(struct fileEntry),
1745 iinfo->i_ext.i_data,
1746 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1747 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1749 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1750 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1751 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1752 memset(&(fe->impIdent), 0, sizeof(struct regid));
1753 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1754 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1755 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1756 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1757 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1758 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1759 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1760 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1761 crclen = sizeof(struct fileEntry);
1763 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1764 iinfo->i_ext.i_data,
1765 inode->i_sb->s_blocksize -
1766 sizeof(struct extendedFileEntry));
1767 efe->objectSize = cpu_to_le64(inode->i_size);
1768 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1770 udf_adjust_time(iinfo, inode->i_atime);
1771 udf_adjust_time(iinfo, inode->i_mtime);
1772 udf_adjust_time(iinfo, inode->i_ctime);
1774 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1775 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1776 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1777 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1779 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1780 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1781 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1782 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1783 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1784 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1785 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1786 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1787 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1788 crclen = sizeof(struct extendedFileEntry);
1792 if (iinfo->i_strat4096) {
1793 fe->icbTag.strategyType = cpu_to_le16(4096);
1794 fe->icbTag.strategyParameter = cpu_to_le16(1);
1795 fe->icbTag.numEntries = cpu_to_le16(2);
1797 fe->icbTag.strategyType = cpu_to_le16(4);
1798 fe->icbTag.numEntries = cpu_to_le16(1);
1802 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1803 else if (S_ISDIR(inode->i_mode))
1804 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1805 else if (S_ISREG(inode->i_mode))
1806 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1807 else if (S_ISLNK(inode->i_mode))
1808 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1809 else if (S_ISBLK(inode->i_mode))
1810 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1811 else if (S_ISCHR(inode->i_mode))
1812 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1813 else if (S_ISFIFO(inode->i_mode))
1814 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1815 else if (S_ISSOCK(inode->i_mode))
1816 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1818 icbflags = iinfo->i_alloc_type |
1819 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1820 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1821 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1822 (le16_to_cpu(fe->icbTag.flags) &
1823 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1824 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1826 fe->icbTag.flags = cpu_to_le16(icbflags);
1827 if (sbi->s_udfrev >= 0x0200)
1828 fe->descTag.descVersion = cpu_to_le16(3);
1830 fe->descTag.descVersion = cpu_to_le16(2);
1831 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1832 fe->descTag.tagLocation = cpu_to_le32(
1833 iinfo->i_location.logicalBlockNum);
1834 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1835 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1836 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1838 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1840 set_buffer_uptodate(bh);
1843 /* write the data blocks */
1844 mark_buffer_dirty(bh);
1846 sync_dirty_buffer(bh);
1847 if (buffer_write_io_error(bh)) {
1848 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1858 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1861 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1862 struct inode *inode = iget_locked(sb, block);
1866 return ERR_PTR(-ENOMEM);
1868 if (!(inode->i_state & I_NEW))
1871 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1872 err = udf_read_inode(inode, hidden_inode);
1875 return ERR_PTR(err);
1877 unlock_new_inode(inode);
1882 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1883 struct extent_position *epos)
1885 struct super_block *sb = inode->i_sb;
1886 struct buffer_head *bh;
1887 struct allocExtDesc *aed;
1888 struct extent_position nepos;
1889 struct kernel_lb_addr neloc;
1892 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1893 adsize = sizeof(struct short_ad);
1894 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1895 adsize = sizeof(struct long_ad);
1899 neloc.logicalBlockNum = block;
1900 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1902 bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1906 memset(bh->b_data, 0x00, sb->s_blocksize);
1907 set_buffer_uptodate(bh);
1909 mark_buffer_dirty_inode(bh, inode);
1911 aed = (struct allocExtDesc *)(bh->b_data);
1912 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1913 aed->previousAllocExtLocation =
1914 cpu_to_le32(epos->block.logicalBlockNum);
1916 aed->lengthAllocDescs = cpu_to_le32(0);
1917 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1921 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1922 sizeof(struct tag));
1924 nepos.block = neloc;
1925 nepos.offset = sizeof(struct allocExtDesc);
1929 * Do we have to copy current last extent to make space for indirect
1932 if (epos->offset + adsize > sb->s_blocksize) {
1933 struct kernel_lb_addr cp_loc;
1937 epos->offset -= adsize;
1938 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1939 cp_len |= ((uint32_t)cp_type) << 30;
1941 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1942 udf_write_aext(inode, epos, &nepos.block,
1943 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1945 __udf_add_aext(inode, epos, &nepos.block,
1946 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1956 * Append extent at the given position - should be the first free one in inode
1957 * / indirect extent. This function assumes there is enough space in the inode
1958 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1960 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1961 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1963 struct udf_inode_info *iinfo = UDF_I(inode);
1964 struct allocExtDesc *aed;
1967 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1968 adsize = sizeof(struct short_ad);
1969 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1970 adsize = sizeof(struct long_ad);
1975 WARN_ON(iinfo->i_lenAlloc !=
1976 epos->offset - udf_file_entry_alloc_offset(inode));
1978 aed = (struct allocExtDesc *)epos->bh->b_data;
1979 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
1980 epos->offset - sizeof(struct allocExtDesc));
1981 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1984 udf_write_aext(inode, epos, eloc, elen, inc);
1987 iinfo->i_lenAlloc += adsize;
1988 mark_inode_dirty(inode);
1990 aed = (struct allocExtDesc *)epos->bh->b_data;
1991 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1992 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1993 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1994 udf_update_tag(epos->bh->b_data,
1995 epos->offset + (inc ? 0 : adsize));
1997 udf_update_tag(epos->bh->b_data,
1998 sizeof(struct allocExtDesc));
1999 mark_buffer_dirty_inode(epos->bh, inode);
2006 * Append extent at given position - should be the first free one in inode
2007 * / indirect extent. Takes care of allocating and linking indirect blocks.
2009 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2010 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2013 struct super_block *sb = inode->i_sb;
2015 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2016 adsize = sizeof(struct short_ad);
2017 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2018 adsize = sizeof(struct long_ad);
2022 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2024 udf_pblk_t new_block;
2026 new_block = udf_new_block(sb, NULL,
2027 epos->block.partitionReferenceNum,
2028 epos->block.logicalBlockNum, &err);
2032 err = udf_setup_indirect_aext(inode, new_block, epos);
2037 return __udf_add_aext(inode, epos, eloc, elen, inc);
2040 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2041 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2045 struct short_ad *sad;
2046 struct long_ad *lad;
2047 struct udf_inode_info *iinfo = UDF_I(inode);
2050 ptr = iinfo->i_ext.i_data + epos->offset -
2051 udf_file_entry_alloc_offset(inode) +
2054 ptr = epos->bh->b_data + epos->offset;
2056 switch (iinfo->i_alloc_type) {
2057 case ICBTAG_FLAG_AD_SHORT:
2058 sad = (struct short_ad *)ptr;
2059 sad->extLength = cpu_to_le32(elen);
2060 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2061 adsize = sizeof(struct short_ad);
2063 case ICBTAG_FLAG_AD_LONG:
2064 lad = (struct long_ad *)ptr;
2065 lad->extLength = cpu_to_le32(elen);
2066 lad->extLocation = cpu_to_lelb(*eloc);
2067 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2068 adsize = sizeof(struct long_ad);
2075 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2076 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2077 struct allocExtDesc *aed =
2078 (struct allocExtDesc *)epos->bh->b_data;
2079 udf_update_tag(epos->bh->b_data,
2080 le32_to_cpu(aed->lengthAllocDescs) +
2081 sizeof(struct allocExtDesc));
2083 mark_buffer_dirty_inode(epos->bh, inode);
2085 mark_inode_dirty(inode);
2089 epos->offset += adsize;
2093 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2094 * someone does some weird stuff.
2096 #define UDF_MAX_INDIR_EXTS 16
2098 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2099 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2102 unsigned int indirections = 0;
2104 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2105 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2108 if (++indirections > UDF_MAX_INDIR_EXTS) {
2109 udf_err(inode->i_sb,
2110 "too many indirect extents in inode %lu\n",
2115 epos->block = *eloc;
2116 epos->offset = sizeof(struct allocExtDesc);
2118 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2119 epos->bh = udf_tread(inode->i_sb, block);
2121 udf_debug("reading block %u failed!\n", block);
2129 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2130 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2135 struct short_ad *sad;
2136 struct long_ad *lad;
2137 struct udf_inode_info *iinfo = UDF_I(inode);
2141 epos->offset = udf_file_entry_alloc_offset(inode);
2142 ptr = iinfo->i_ext.i_data + epos->offset -
2143 udf_file_entry_alloc_offset(inode) +
2145 alen = udf_file_entry_alloc_offset(inode) +
2149 epos->offset = sizeof(struct allocExtDesc);
2150 ptr = epos->bh->b_data + epos->offset;
2151 alen = sizeof(struct allocExtDesc) +
2152 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2156 switch (iinfo->i_alloc_type) {
2157 case ICBTAG_FLAG_AD_SHORT:
2158 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2161 etype = le32_to_cpu(sad->extLength) >> 30;
2162 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2163 eloc->partitionReferenceNum =
2164 iinfo->i_location.partitionReferenceNum;
2165 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2167 case ICBTAG_FLAG_AD_LONG:
2168 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2171 etype = le32_to_cpu(lad->extLength) >> 30;
2172 *eloc = lelb_to_cpu(lad->extLocation);
2173 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2176 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2183 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2184 struct kernel_lb_addr neloc, uint32_t nelen)
2186 struct kernel_lb_addr oeloc;
2193 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2194 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2196 nelen = (etype << 30) | oelen;
2198 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2201 return (nelen >> 30);
2204 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2206 struct extent_position oepos;
2209 struct allocExtDesc *aed;
2210 struct udf_inode_info *iinfo;
2211 struct kernel_lb_addr eloc;
2219 iinfo = UDF_I(inode);
2220 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2221 adsize = sizeof(struct short_ad);
2222 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2223 adsize = sizeof(struct long_ad);
2228 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2231 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2232 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2233 if (oepos.bh != epos.bh) {
2234 oepos.block = epos.block;
2238 oepos.offset = epos.offset - adsize;
2241 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2244 if (epos.bh != oepos.bh) {
2245 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2246 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2247 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2249 iinfo->i_lenAlloc -= (adsize * 2);
2250 mark_inode_dirty(inode);
2252 aed = (struct allocExtDesc *)oepos.bh->b_data;
2253 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2254 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2255 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2256 udf_update_tag(oepos.bh->b_data,
2257 oepos.offset - (2 * adsize));
2259 udf_update_tag(oepos.bh->b_data,
2260 sizeof(struct allocExtDesc));
2261 mark_buffer_dirty_inode(oepos.bh, inode);
2264 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2266 iinfo->i_lenAlloc -= adsize;
2267 mark_inode_dirty(inode);
2269 aed = (struct allocExtDesc *)oepos.bh->b_data;
2270 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2271 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2272 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2273 udf_update_tag(oepos.bh->b_data,
2274 epos.offset - adsize);
2276 udf_update_tag(oepos.bh->b_data,
2277 sizeof(struct allocExtDesc));
2278 mark_buffer_dirty_inode(oepos.bh, inode);
2285 return (elen >> 30);
2288 int8_t inode_bmap(struct inode *inode, sector_t block,
2289 struct extent_position *pos, struct kernel_lb_addr *eloc,
2290 uint32_t *elen, sector_t *offset)
2292 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2293 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2295 struct udf_inode_info *iinfo;
2297 iinfo = UDF_I(inode);
2298 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2300 pos->block = iinfo->i_location;
2305 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2307 *offset = (bcount - lbcount) >> blocksize_bits;
2308 iinfo->i_lenExtents = lbcount;
2312 } while (lbcount <= bcount);
2313 /* update extent cache */
2314 udf_update_extent_cache(inode, lbcount - *elen, pos);
2315 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2320 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2322 struct kernel_lb_addr eloc;
2325 struct extent_position epos = {};
2328 down_read(&UDF_I(inode)->i_data_sem);
2330 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2331 (EXT_RECORDED_ALLOCATED >> 30))
2332 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2336 up_read(&UDF_I(inode)->i_data_sem);
2339 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2340 return udf_fixed_to_variable(ret);