Root/fs/udf/inode.c

1/*
2 * inode.c
3 *
4 * PURPOSE
5 * Inode handling routines for the OSTA-UDF(tm) filesystem.
6 *
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
22 * 12/06/98 blf partition support in udf_iget, udf_block_map
23 * and udf_read_inode
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>
34#include <linux/module.h>
35#include <linux/pagemap.h>
36#include <linux/buffer_head.h>
37#include <linux/writeback.h>
38#include <linux/slab.h>
39#include <linux/crc-itu-t.h>
40
41#include "udf_i.h"
42#include "udf_sb.h"
43
44MODULE_AUTHOR("Ben Fennema");
45MODULE_DESCRIPTION("Universal Disk Format Filesystem");
46MODULE_LICENSE("GPL");
47
48#define EXTENT_MERGE_SIZE 5
49
50static mode_t udf_convert_permissions(struct fileEntry *);
51static int udf_update_inode(struct inode *, int);
52static void udf_fill_inode(struct inode *, struct buffer_head *);
53static int udf_sync_inode(struct inode *inode);
54static int udf_alloc_i_data(struct inode *inode, size_t size);
55static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
56                    sector_t *, int *);
57static int8_t udf_insert_aext(struct inode *, struct extent_position,
58                  struct kernel_lb_addr, uint32_t);
59static void udf_split_extents(struct inode *, int *, int, int,
60                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
61static void udf_prealloc_extents(struct inode *, int, int,
62                 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
63static void udf_merge_extents(struct inode *,
64                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
65static void udf_update_extents(struct inode *,
66                   struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
67                   struct extent_position *);
68static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
69
70
71void udf_evict_inode(struct inode *inode)
72{
73    struct udf_inode_info *iinfo = UDF_I(inode);
74    int want_delete = 0;
75
76    if (!inode->i_nlink && !is_bad_inode(inode)) {
77        want_delete = 1;
78        udf_setsize(inode, 0);
79        udf_update_inode(inode, IS_SYNC(inode));
80    } else
81        truncate_inode_pages(&inode->i_data, 0);
82    invalidate_inode_buffers(inode);
83    end_writeback(inode);
84    if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
85        inode->i_size != iinfo->i_lenExtents) {
86        printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
87            "inode size %llu different from extent length %llu. "
88            "Filesystem need not be standards compliant.\n",
89            inode->i_sb->s_id, inode->i_ino, inode->i_mode,
90            (unsigned long long)inode->i_size,
91            (unsigned long long)iinfo->i_lenExtents);
92    }
93    kfree(iinfo->i_ext.i_data);
94    iinfo->i_ext.i_data = NULL;
95    if (want_delete) {
96        udf_free_inode(inode);
97    }
98}
99
100static int udf_writepage(struct page *page, struct writeback_control *wbc)
101{
102    return block_write_full_page(page, udf_get_block, wbc);
103}
104
105static int udf_readpage(struct file *file, struct page *page)
106{
107    return block_read_full_page(page, udf_get_block);
108}
109
110static int udf_write_begin(struct file *file, struct address_space *mapping,
111            loff_t pos, unsigned len, unsigned flags,
112            struct page **pagep, void **fsdata)
113{
114    int ret;
115
116    ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
117    if (unlikely(ret)) {
118        struct inode *inode = mapping->host;
119        struct udf_inode_info *iinfo = UDF_I(inode);
120        loff_t isize = inode->i_size;
121
122        if (pos + len > isize) {
123            truncate_pagecache(inode, pos + len, isize);
124            if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
125                down_write(&iinfo->i_data_sem);
126                udf_truncate_extents(inode);
127                up_write(&iinfo->i_data_sem);
128            }
129        }
130    }
131
132    return ret;
133}
134
135static sector_t udf_bmap(struct address_space *mapping, sector_t block)
136{
137    return generic_block_bmap(mapping, block, udf_get_block);
138}
139
140const struct address_space_operations udf_aops = {
141    .readpage = udf_readpage,
142    .writepage = udf_writepage,
143    .write_begin = udf_write_begin,
144    .write_end = generic_write_end,
145    .bmap = udf_bmap,
146};
147
148int udf_expand_file_adinicb(struct inode *inode)
149{
150    struct page *page;
151    char *kaddr;
152    struct udf_inode_info *iinfo = UDF_I(inode);
153    int err;
154    struct writeback_control udf_wbc = {
155        .sync_mode = WB_SYNC_NONE,
156        .nr_to_write = 1,
157    };
158
159    if (!iinfo->i_lenAlloc) {
160        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
161            iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
162        else
163            iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
164        /* from now on we have normal address_space methods */
165        inode->i_data.a_ops = &udf_aops;
166        mark_inode_dirty(inode);
167        return 0;
168    }
169
170    page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
171    if (!page)
172        return -ENOMEM;
173
174    if (!PageUptodate(page)) {
175        kaddr = kmap(page);
176        memset(kaddr + iinfo->i_lenAlloc, 0x00,
177               PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
178        memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
179            iinfo->i_lenAlloc);
180        flush_dcache_page(page);
181        SetPageUptodate(page);
182        kunmap(page);
183    }
184    memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
185           iinfo->i_lenAlloc);
186    iinfo->i_lenAlloc = 0;
187    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
188        iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
189    else
190        iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
191    /* from now on we have normal address_space methods */
192    inode->i_data.a_ops = &udf_aops;
193    err = inode->i_data.a_ops->writepage(page, &udf_wbc);
194    if (err) {
195        /* Restore everything back so that we don't lose data... */
196        lock_page(page);
197        kaddr = kmap(page);
198        memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
199               inode->i_size);
200        kunmap(page);
201        unlock_page(page);
202        iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
203        inode->i_data.a_ops = &udf_adinicb_aops;
204    }
205    page_cache_release(page);
206    mark_inode_dirty(inode);
207
208    return err;
209}
210
211struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
212                       int *err)
213{
214    int newblock;
215    struct buffer_head *dbh = NULL;
216    struct kernel_lb_addr eloc;
217    uint8_t alloctype;
218    struct extent_position epos;
219
220    struct udf_fileident_bh sfibh, dfibh;
221    loff_t f_pos = udf_ext0_offset(inode);
222    int size = udf_ext0_offset(inode) + inode->i_size;
223    struct fileIdentDesc cfi, *sfi, *dfi;
224    struct udf_inode_info *iinfo = UDF_I(inode);
225
226    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
227        alloctype = ICBTAG_FLAG_AD_SHORT;
228    else
229        alloctype = ICBTAG_FLAG_AD_LONG;
230
231    if (!inode->i_size) {
232        iinfo->i_alloc_type = alloctype;
233        mark_inode_dirty(inode);
234        return NULL;
235    }
236
237    /* alloc block, and copy data to it */
238    *block = udf_new_block(inode->i_sb, inode,
239                   iinfo->i_location.partitionReferenceNum,
240                   iinfo->i_location.logicalBlockNum, err);
241    if (!(*block))
242        return NULL;
243    newblock = udf_get_pblock(inode->i_sb, *block,
244                  iinfo->i_location.partitionReferenceNum,
245                0);
246    if (!newblock)
247        return NULL;
248    dbh = udf_tgetblk(inode->i_sb, newblock);
249    if (!dbh)
250        return NULL;
251    lock_buffer(dbh);
252    memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
253    set_buffer_uptodate(dbh);
254    unlock_buffer(dbh);
255    mark_buffer_dirty_inode(dbh, inode);
256
257    sfibh.soffset = sfibh.eoffset =
258            f_pos & (inode->i_sb->s_blocksize - 1);
259    sfibh.sbh = sfibh.ebh = NULL;
260    dfibh.soffset = dfibh.eoffset = 0;
261    dfibh.sbh = dfibh.ebh = dbh;
262    while (f_pos < size) {
263        iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
264        sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
265                     NULL, NULL, NULL);
266        if (!sfi) {
267            brelse(dbh);
268            return NULL;
269        }
270        iinfo->i_alloc_type = alloctype;
271        sfi->descTag.tagLocation = cpu_to_le32(*block);
272        dfibh.soffset = dfibh.eoffset;
273        dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
274        dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
275        if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
276                 sfi->fileIdent +
277                    le16_to_cpu(sfi->lengthOfImpUse))) {
278            iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
279            brelse(dbh);
280            return NULL;
281        }
282    }
283    mark_buffer_dirty_inode(dbh, inode);
284
285    memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
286        iinfo->i_lenAlloc);
287    iinfo->i_lenAlloc = 0;
288    eloc.logicalBlockNum = *block;
289    eloc.partitionReferenceNum =
290                iinfo->i_location.partitionReferenceNum;
291    iinfo->i_lenExtents = inode->i_size;
292    epos.bh = NULL;
293    epos.block = iinfo->i_location;
294    epos.offset = udf_file_entry_alloc_offset(inode);
295    udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
296    /* UniqueID stuff */
297
298    brelse(epos.bh);
299    mark_inode_dirty(inode);
300    return dbh;
301}
302
303static int udf_get_block(struct inode *inode, sector_t block,
304             struct buffer_head *bh_result, int create)
305{
306    int err, new;
307    struct buffer_head *bh;
308    sector_t phys = 0;
309    struct udf_inode_info *iinfo;
310
311    if (!create) {
312        phys = udf_block_map(inode, block);
313        if (phys)
314            map_bh(bh_result, inode->i_sb, phys);
315        return 0;
316    }
317
318    err = -EIO;
319    new = 0;
320    bh = NULL;
321    iinfo = UDF_I(inode);
322
323    down_write(&iinfo->i_data_sem);
324    if (block == iinfo->i_next_alloc_block + 1) {
325        iinfo->i_next_alloc_block++;
326        iinfo->i_next_alloc_goal++;
327    }
328
329    err = 0;
330
331    bh = inode_getblk(inode, block, &err, &phys, &new);
332    BUG_ON(bh);
333    if (err)
334        goto abort;
335    BUG_ON(!phys);
336
337    if (new)
338        set_buffer_new(bh_result);
339    map_bh(bh_result, inode->i_sb, phys);
340
341abort:
342    up_write(&iinfo->i_data_sem);
343    return err;
344}
345
346static struct buffer_head *udf_getblk(struct inode *inode, long block,
347                      int create, int *err)
348{
349    struct buffer_head *bh;
350    struct buffer_head dummy;
351
352    dummy.b_state = 0;
353    dummy.b_blocknr = -1000;
354    *err = udf_get_block(inode, block, &dummy, create);
355    if (!*err && buffer_mapped(&dummy)) {
356        bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
357        if (buffer_new(&dummy)) {
358            lock_buffer(bh);
359            memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
360            set_buffer_uptodate(bh);
361            unlock_buffer(bh);
362            mark_buffer_dirty_inode(bh, inode);
363        }
364        return bh;
365    }
366
367    return NULL;
368}
369
370/* Extend the file by 'blocks' blocks, return the number of extents added */
371static int udf_do_extend_file(struct inode *inode,
372                  struct extent_position *last_pos,
373                  struct kernel_long_ad *last_ext,
374                  sector_t blocks)
375{
376    sector_t add;
377    int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
378    struct super_block *sb = inode->i_sb;
379    struct kernel_lb_addr prealloc_loc = {};
380    int prealloc_len = 0;
381    struct udf_inode_info *iinfo;
382    int err;
383
384    /* The previous extent is fake and we should not extend by anything
385     * - there's nothing to do... */
386    if (!blocks && fake)
387        return 0;
388
389    iinfo = UDF_I(inode);
390    /* Round the last extent up to a multiple of block size */
391    if (last_ext->extLength & (sb->s_blocksize - 1)) {
392        last_ext->extLength =
393            (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
394            (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
395              sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
396        iinfo->i_lenExtents =
397            (iinfo->i_lenExtents + sb->s_blocksize - 1) &
398            ~(sb->s_blocksize - 1);
399    }
400
401    /* Last extent are just preallocated blocks? */
402    if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
403                        EXT_NOT_RECORDED_ALLOCATED) {
404        /* Save the extent so that we can reattach it to the end */
405        prealloc_loc = last_ext->extLocation;
406        prealloc_len = last_ext->extLength;
407        /* Mark the extent as a hole */
408        last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
409            (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
410        last_ext->extLocation.logicalBlockNum = 0;
411        last_ext->extLocation.partitionReferenceNum = 0;
412    }
413
414    /* Can we merge with the previous extent? */
415    if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
416                    EXT_NOT_RECORDED_NOT_ALLOCATED) {
417        add = ((1 << 30) - sb->s_blocksize -
418            (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
419            sb->s_blocksize_bits;
420        if (add > blocks)
421            add = blocks;
422        blocks -= add;
423        last_ext->extLength += add << sb->s_blocksize_bits;
424    }
425
426    if (fake) {
427        udf_add_aext(inode, last_pos, &last_ext->extLocation,
428                 last_ext->extLength, 1);
429        count++;
430    } else
431        udf_write_aext(inode, last_pos, &last_ext->extLocation,
432                last_ext->extLength, 1);
433
434    /* Managed to do everything necessary? */
435    if (!blocks)
436        goto out;
437
438    /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
439    last_ext->extLocation.logicalBlockNum = 0;
440    last_ext->extLocation.partitionReferenceNum = 0;
441    add = (1 << (30-sb->s_blocksize_bits)) - 1;
442    last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
443                (add << sb->s_blocksize_bits);
444
445    /* Create enough extents to cover the whole hole */
446    while (blocks > add) {
447        blocks -= add;
448        err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
449                   last_ext->extLength, 1);
450        if (err)
451            return err;
452        count++;
453    }
454    if (blocks) {
455        last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
456            (blocks << sb->s_blocksize_bits);
457        err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
458                   last_ext->extLength, 1);
459        if (err)
460            return err;
461        count++;
462    }
463
464out:
465    /* Do we have some preallocated blocks saved? */
466    if (prealloc_len) {
467        err = udf_add_aext(inode, last_pos, &prealloc_loc,
468                   prealloc_len, 1);
469        if (err)
470            return err;
471        last_ext->extLocation = prealloc_loc;
472        last_ext->extLength = prealloc_len;
473        count++;
474    }
475
476    /* last_pos should point to the last written extent... */
477    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
478        last_pos->offset -= sizeof(struct short_ad);
479    else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
480        last_pos->offset -= sizeof(struct long_ad);
481    else
482        return -EIO;
483
484    return count;
485}
486
487static int udf_extend_file(struct inode *inode, loff_t newsize)
488{
489
490    struct extent_position epos;
491    struct kernel_lb_addr eloc;
492    uint32_t elen;
493    int8_t etype;
494    struct super_block *sb = inode->i_sb;
495    sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
496    int adsize;
497    struct udf_inode_info *iinfo = UDF_I(inode);
498    struct kernel_long_ad extent;
499    int err;
500
501    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
502        adsize = sizeof(struct short_ad);
503    else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
504        adsize = sizeof(struct long_ad);
505    else
506        BUG();
507
508    etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
509
510    /* File has extent covering the new size (could happen when extending
511     * inside a block)? */
512    if (etype != -1)
513        return 0;
514    if (newsize & (sb->s_blocksize - 1))
515        offset++;
516    /* Extended file just to the boundary of the last file block? */
517    if (offset == 0)
518        return 0;
519
520    /* Truncate is extending the file by 'offset' blocks */
521    if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
522        (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
523        /* File has no extents at all or has empty last
524         * indirect extent! Create a fake extent... */
525        extent.extLocation.logicalBlockNum = 0;
526        extent.extLocation.partitionReferenceNum = 0;
527        extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
528    } else {
529        epos.offset -= adsize;
530        etype = udf_next_aext(inode, &epos, &extent.extLocation,
531                      &extent.extLength, 0);
532        extent.extLength |= etype << 30;
533    }
534    err = udf_do_extend_file(inode, &epos, &extent, offset);
535    if (err < 0)
536        goto out;
537    err = 0;
538    iinfo->i_lenExtents = newsize;
539out:
540    brelse(epos.bh);
541    return err;
542}
543
544static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
545                    int *err, sector_t *phys, int *new)
546{
547    static sector_t last_block;
548    struct buffer_head *result = NULL;
549    struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
550    struct extent_position prev_epos, cur_epos, next_epos;
551    int count = 0, startnum = 0, endnum = 0;
552    uint32_t elen = 0, tmpelen;
553    struct kernel_lb_addr eloc, tmpeloc;
554    int c = 1;
555    loff_t lbcount = 0, b_off = 0;
556    uint32_t newblocknum, newblock;
557    sector_t offset = 0;
558    int8_t etype;
559    struct udf_inode_info *iinfo = UDF_I(inode);
560    int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
561    int lastblock = 0;
562
563    prev_epos.offset = udf_file_entry_alloc_offset(inode);
564    prev_epos.block = iinfo->i_location;
565    prev_epos.bh = NULL;
566    cur_epos = next_epos = prev_epos;
567    b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
568
569    /* find the extent which contains the block we are looking for.
570       alternate between laarr[0] and laarr[1] for locations of the
571       current extent, and the previous extent */
572    do {
573        if (prev_epos.bh != cur_epos.bh) {
574            brelse(prev_epos.bh);
575            get_bh(cur_epos.bh);
576            prev_epos.bh = cur_epos.bh;
577        }
578        if (cur_epos.bh != next_epos.bh) {
579            brelse(cur_epos.bh);
580            get_bh(next_epos.bh);
581            cur_epos.bh = next_epos.bh;
582        }
583
584        lbcount += elen;
585
586        prev_epos.block = cur_epos.block;
587        cur_epos.block = next_epos.block;
588
589        prev_epos.offset = cur_epos.offset;
590        cur_epos.offset = next_epos.offset;
591
592        etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
593        if (etype == -1)
594            break;
595
596        c = !c;
597
598        laarr[c].extLength = (etype << 30) | elen;
599        laarr[c].extLocation = eloc;
600
601        if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
602            pgoal = eloc.logicalBlockNum +
603                ((elen + inode->i_sb->s_blocksize - 1) >>
604                 inode->i_sb->s_blocksize_bits);
605
606        count++;
607    } while (lbcount + elen <= b_off);
608
609    b_off -= lbcount;
610    offset = b_off >> inode->i_sb->s_blocksize_bits;
611    /*
612     * Move prev_epos and cur_epos into indirect extent if we are at
613     * the pointer to it
614     */
615    udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
616    udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
617
618    /* if the extent is allocated and recorded, return the block
619       if the extent is not a multiple of the blocksize, round up */
620
621    if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
622        if (elen & (inode->i_sb->s_blocksize - 1)) {
623            elen = EXT_RECORDED_ALLOCATED |
624                ((elen + inode->i_sb->s_blocksize - 1) &
625                 ~(inode->i_sb->s_blocksize - 1));
626            udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
627        }
628        brelse(prev_epos.bh);
629        brelse(cur_epos.bh);
630        brelse(next_epos.bh);
631        newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
632        *phys = newblock;
633        return NULL;
634    }
635
636    last_block = block;
637    /* Are we beyond EOF? */
638    if (etype == -1) {
639        int ret;
640
641        if (count) {
642            if (c)
643                laarr[0] = laarr[1];
644            startnum = 1;
645        } else {
646            /* Create a fake extent when there's not one */
647            memset(&laarr[0].extLocation, 0x00,
648                sizeof(struct kernel_lb_addr));
649            laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
650            /* Will udf_do_extend_file() create real extent from
651               a fake one? */
652            startnum = (offset > 0);
653        }
654        /* Create extents for the hole between EOF and offset */
655        ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
656        if (ret < 0) {
657            brelse(prev_epos.bh);
658            brelse(cur_epos.bh);
659            brelse(next_epos.bh);
660            *err = ret;
661            return NULL;
662        }
663        c = 0;
664        offset = 0;
665        count += ret;
666        /* We are not covered by a preallocated extent? */
667        if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
668                        EXT_NOT_RECORDED_ALLOCATED) {
669            /* Is there any real extent? - otherwise we overwrite
670             * the fake one... */
671            if (count)
672                c = !c;
673            laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
674                inode->i_sb->s_blocksize;
675            memset(&laarr[c].extLocation, 0x00,
676                sizeof(struct kernel_lb_addr));
677            count++;
678            endnum++;
679        }
680        endnum = c + 1;
681        lastblock = 1;
682    } else {
683        endnum = startnum = ((count > 2) ? 2 : count);
684
685        /* if the current extent is in position 0,
686           swap it with the previous */
687        if (!c && count != 1) {
688            laarr[2] = laarr[0];
689            laarr[0] = laarr[1];
690            laarr[1] = laarr[2];
691            c = 1;
692        }
693
694        /* if the current block is located in an extent,
695           read the next extent */
696        etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
697        if (etype != -1) {
698            laarr[c + 1].extLength = (etype << 30) | elen;
699            laarr[c + 1].extLocation = eloc;
700            count++;
701            startnum++;
702            endnum++;
703        } else
704            lastblock = 1;
705    }
706
707    /* if the current extent is not recorded but allocated, get the
708     * block in the extent corresponding to the requested block */
709    if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
710        newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
711    else { /* otherwise, allocate a new block */
712        if (iinfo->i_next_alloc_block == block)
713            goal = iinfo->i_next_alloc_goal;
714
715        if (!goal) {
716            if (!(goal = pgoal)) /* XXX: what was intended here? */
717                goal = iinfo->i_location.logicalBlockNum + 1;
718        }
719
720        newblocknum = udf_new_block(inode->i_sb, inode,
721                iinfo->i_location.partitionReferenceNum,
722                goal, err);
723        if (!newblocknum) {
724            brelse(prev_epos.bh);
725            *err = -ENOSPC;
726            return NULL;
727        }
728        iinfo->i_lenExtents += inode->i_sb->s_blocksize;
729    }
730
731    /* if the extent the requsted block is located in contains multiple
732     * blocks, split the extent into at most three extents. blocks prior
733     * to requested block, requested block, and blocks after requested
734     * block */
735    udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
736
737#ifdef UDF_PREALLOCATE
738    /* We preallocate blocks only for regular files. It also makes sense
739     * for directories but there's a problem when to drop the
740     * preallocation. We might use some delayed work for that but I feel
741     * it's overengineering for a filesystem like UDF. */
742    if (S_ISREG(inode->i_mode))
743        udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
744#endif
745
746    /* merge any continuous blocks in laarr */
747    udf_merge_extents(inode, laarr, &endnum);
748
749    /* write back the new extents, inserting new extents if the new number
750     * of extents is greater than the old number, and deleting extents if
751     * the new number of extents is less than the old number */
752    udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
753
754    brelse(prev_epos.bh);
755
756    newblock = udf_get_pblock(inode->i_sb, newblocknum,
757                iinfo->i_location.partitionReferenceNum, 0);
758    if (!newblock)
759        return NULL;
760    *phys = newblock;
761    *err = 0;
762    *new = 1;
763    iinfo->i_next_alloc_block = block;
764    iinfo->i_next_alloc_goal = newblocknum;
765    inode->i_ctime = current_fs_time(inode->i_sb);
766
767    if (IS_SYNC(inode))
768        udf_sync_inode(inode);
769    else
770        mark_inode_dirty(inode);
771
772    return result;
773}
774
775static void udf_split_extents(struct inode *inode, int *c, int offset,
776                  int newblocknum,
777                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
778                  int *endnum)
779{
780    unsigned long blocksize = inode->i_sb->s_blocksize;
781    unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
782
783    if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
784        (laarr[*c].extLength >> 30) ==
785                (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
786        int curr = *c;
787        int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
788                blocksize - 1) >> blocksize_bits;
789        int8_t etype = (laarr[curr].extLength >> 30);
790
791        if (blen == 1)
792            ;
793        else if (!offset || blen == offset + 1) {
794            laarr[curr + 2] = laarr[curr + 1];
795            laarr[curr + 1] = laarr[curr];
796        } else {
797            laarr[curr + 3] = laarr[curr + 1];
798            laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
799        }
800
801        if (offset) {
802            if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
803                udf_free_blocks(inode->i_sb, inode,
804                        &laarr[curr].extLocation,
805                        0, offset);
806                laarr[curr].extLength =
807                    EXT_NOT_RECORDED_NOT_ALLOCATED |
808                    (offset << blocksize_bits);
809                laarr[curr].extLocation.logicalBlockNum = 0;
810                laarr[curr].extLocation.
811                        partitionReferenceNum = 0;
812            } else
813                laarr[curr].extLength = (etype << 30) |
814                    (offset << blocksize_bits);
815            curr++;
816            (*c)++;
817            (*endnum)++;
818        }
819
820        laarr[curr].extLocation.logicalBlockNum = newblocknum;
821        if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
822            laarr[curr].extLocation.partitionReferenceNum =
823                UDF_I(inode)->i_location.partitionReferenceNum;
824        laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
825            blocksize;
826        curr++;
827
828        if (blen != offset + 1) {
829            if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
830                laarr[curr].extLocation.logicalBlockNum +=
831                                offset + 1;
832            laarr[curr].extLength = (etype << 30) |
833                ((blen - (offset + 1)) << blocksize_bits);
834            curr++;
835            (*endnum)++;
836        }
837    }
838}
839
840static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
841                 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
842                 int *endnum)
843{
844    int start, length = 0, currlength = 0, i;
845
846    if (*endnum >= (c + 1)) {
847        if (!lastblock)
848            return;
849        else
850            start = c;
851    } else {
852        if ((laarr[c + 1].extLength >> 30) ==
853                    (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
854            start = c + 1;
855            length = currlength =
856                (((laarr[c + 1].extLength &
857                    UDF_EXTENT_LENGTH_MASK) +
858                inode->i_sb->s_blocksize - 1) >>
859                inode->i_sb->s_blocksize_bits);
860        } else
861            start = c;
862    }
863
864    for (i = start + 1; i <= *endnum; i++) {
865        if (i == *endnum) {
866            if (lastblock)
867                length += UDF_DEFAULT_PREALLOC_BLOCKS;
868        } else if ((laarr[i].extLength >> 30) ==
869                (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
870            length += (((laarr[i].extLength &
871                        UDF_EXTENT_LENGTH_MASK) +
872                    inode->i_sb->s_blocksize - 1) >>
873                    inode->i_sb->s_blocksize_bits);
874        } else
875            break;
876    }
877
878    if (length) {
879        int next = laarr[start].extLocation.logicalBlockNum +
880            (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
881              inode->i_sb->s_blocksize - 1) >>
882              inode->i_sb->s_blocksize_bits);
883        int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
884                laarr[start].extLocation.partitionReferenceNum,
885                next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
886                length : UDF_DEFAULT_PREALLOC_BLOCKS) -
887                currlength);
888        if (numalloc) {
889            if (start == (c + 1))
890                laarr[start].extLength +=
891                    (numalloc <<
892                     inode->i_sb->s_blocksize_bits);
893            else {
894                memmove(&laarr[c + 2], &laarr[c + 1],
895                    sizeof(struct long_ad) * (*endnum - (c + 1)));
896                (*endnum)++;
897                laarr[c + 1].extLocation.logicalBlockNum = next;
898                laarr[c + 1].extLocation.partitionReferenceNum =
899                    laarr[c].extLocation.
900                            partitionReferenceNum;
901                laarr[c + 1].extLength =
902                    EXT_NOT_RECORDED_ALLOCATED |
903                    (numalloc <<
904                     inode->i_sb->s_blocksize_bits);
905                start = c + 1;
906            }
907
908            for (i = start + 1; numalloc && i < *endnum; i++) {
909                int elen = ((laarr[i].extLength &
910                        UDF_EXTENT_LENGTH_MASK) +
911                        inode->i_sb->s_blocksize - 1) >>
912                        inode->i_sb->s_blocksize_bits;
913
914                if (elen > numalloc) {
915                    laarr[i].extLength -=
916                        (numalloc <<
917                         inode->i_sb->s_blocksize_bits);
918                    numalloc = 0;
919                } else {
920                    numalloc -= elen;
921                    if (*endnum > (i + 1))
922                        memmove(&laarr[i],
923                            &laarr[i + 1],
924                            sizeof(struct long_ad) *
925                            (*endnum - (i + 1)));
926                    i--;
927                    (*endnum)--;
928                }
929            }
930            UDF_I(inode)->i_lenExtents +=
931                numalloc << inode->i_sb->s_blocksize_bits;
932        }
933    }
934}
935
936static void udf_merge_extents(struct inode *inode,
937                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
938                  int *endnum)
939{
940    int i;
941    unsigned long blocksize = inode->i_sb->s_blocksize;
942    unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
943
944    for (i = 0; i < (*endnum - 1); i++) {
945        struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
946        struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
947
948        if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
949            (((li->extLength >> 30) ==
950                (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
951            ((lip1->extLocation.logicalBlockNum -
952              li->extLocation.logicalBlockNum) ==
953            (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
954            blocksize - 1) >> blocksize_bits)))) {
955
956            if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
957                (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
958                blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
959                lip1->extLength = (lip1->extLength -
960                          (li->extLength &
961                           UDF_EXTENT_LENGTH_MASK) +
962                           UDF_EXTENT_LENGTH_MASK) &
963                            ~(blocksize - 1);
964                li->extLength = (li->extLength &
965                         UDF_EXTENT_FLAG_MASK) +
966                        (UDF_EXTENT_LENGTH_MASK + 1) -
967                        blocksize;
968                lip1->extLocation.logicalBlockNum =
969                    li->extLocation.logicalBlockNum +
970                    ((li->extLength &
971                        UDF_EXTENT_LENGTH_MASK) >>
972                        blocksize_bits);
973            } else {
974                li->extLength = lip1->extLength +
975                    (((li->extLength &
976                        UDF_EXTENT_LENGTH_MASK) +
977                     blocksize - 1) & ~(blocksize - 1));
978                if (*endnum > (i + 2))
979                    memmove(&laarr[i + 1], &laarr[i + 2],
980                        sizeof(struct long_ad) *
981                        (*endnum - (i + 2)));
982                i--;
983                (*endnum)--;
984            }
985        } else if (((li->extLength >> 30) ==
986                (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
987               ((lip1->extLength >> 30) ==
988                (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
989            udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
990                    ((li->extLength &
991                      UDF_EXTENT_LENGTH_MASK) +
992                     blocksize - 1) >> blocksize_bits);
993            li->extLocation.logicalBlockNum = 0;
994            li->extLocation.partitionReferenceNum = 0;
995
996            if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
997                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
998                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
999                lip1->extLength = (lip1->extLength -
1000                           (li->extLength &
1001                           UDF_EXTENT_LENGTH_MASK) +
1002                           UDF_EXTENT_LENGTH_MASK) &
1003                           ~(blocksize - 1);
1004                li->extLength = (li->extLength &
1005                         UDF_EXTENT_FLAG_MASK) +
1006                        (UDF_EXTENT_LENGTH_MASK + 1) -
1007                        blocksize;
1008            } else {
1009                li->extLength = lip1->extLength +
1010                    (((li->extLength &
1011                        UDF_EXTENT_LENGTH_MASK) +
1012                      blocksize - 1) & ~(blocksize - 1));
1013                if (*endnum > (i + 2))
1014                    memmove(&laarr[i + 1], &laarr[i + 2],
1015                        sizeof(struct long_ad) *
1016                        (*endnum - (i + 2)));
1017                i--;
1018                (*endnum)--;
1019            }
1020        } else if ((li->extLength >> 30) ==
1021                    (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1022            udf_free_blocks(inode->i_sb, inode,
1023                    &li->extLocation, 0,
1024                    ((li->extLength &
1025                        UDF_EXTENT_LENGTH_MASK) +
1026                     blocksize - 1) >> blocksize_bits);
1027            li->extLocation.logicalBlockNum = 0;
1028            li->extLocation.partitionReferenceNum = 0;
1029            li->extLength = (li->extLength &
1030                        UDF_EXTENT_LENGTH_MASK) |
1031                        EXT_NOT_RECORDED_NOT_ALLOCATED;
1032        }
1033    }
1034}
1035
1036static void udf_update_extents(struct inode *inode,
1037                   struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1038                   int startnum, int endnum,
1039                   struct extent_position *epos)
1040{
1041    int start = 0, i;
1042    struct kernel_lb_addr tmploc;
1043    uint32_t tmplen;
1044
1045    if (startnum > endnum) {
1046        for (i = 0; i < (startnum - endnum); i++)
1047            udf_delete_aext(inode, *epos, laarr[i].extLocation,
1048                    laarr[i].extLength);
1049    } else if (startnum < endnum) {
1050        for (i = 0; i < (endnum - startnum); i++) {
1051            udf_insert_aext(inode, *epos, laarr[i].extLocation,
1052                    laarr[i].extLength);
1053            udf_next_aext(inode, epos, &laarr[i].extLocation,
1054                      &laarr[i].extLength, 1);
1055            start++;
1056        }
1057    }
1058
1059    for (i = start; i < endnum; i++) {
1060        udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1061        udf_write_aext(inode, epos, &laarr[i].extLocation,
1062                   laarr[i].extLength, 1);
1063    }
1064}
1065
1066struct buffer_head *udf_bread(struct inode *inode, int block,
1067                  int create, int *err)
1068{
1069    struct buffer_head *bh = NULL;
1070
1071    bh = udf_getblk(inode, block, create, err);
1072    if (!bh)
1073        return NULL;
1074
1075    if (buffer_uptodate(bh))
1076        return bh;
1077
1078    ll_rw_block(READ, 1, &bh);
1079
1080    wait_on_buffer(bh);
1081    if (buffer_uptodate(bh))
1082        return bh;
1083
1084    brelse(bh);
1085    *err = -EIO;
1086    return NULL;
1087}
1088
1089int udf_setsize(struct inode *inode, loff_t newsize)
1090{
1091    int err;
1092    struct udf_inode_info *iinfo;
1093    int bsize = 1 << inode->i_blkbits;
1094
1095    if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1096          S_ISLNK(inode->i_mode)))
1097        return -EINVAL;
1098    if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1099        return -EPERM;
1100
1101    iinfo = UDF_I(inode);
1102    if (newsize > inode->i_size) {
1103        down_write(&iinfo->i_data_sem);
1104        if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1105            if (bsize <
1106                (udf_file_entry_alloc_offset(inode) + newsize)) {
1107                err = udf_expand_file_adinicb(inode);
1108                if (err) {
1109                    up_write(&iinfo->i_data_sem);
1110                    return err;
1111                }
1112            } else
1113                iinfo->i_lenAlloc = newsize;
1114        }
1115        err = udf_extend_file(inode, newsize);
1116        if (err) {
1117            up_write(&iinfo->i_data_sem);
1118            return err;
1119        }
1120        truncate_setsize(inode, newsize);
1121        up_write(&iinfo->i_data_sem);
1122    } else {
1123        if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1124            down_write(&iinfo->i_data_sem);
1125            memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1126                   0x00, bsize - newsize -
1127                   udf_file_entry_alloc_offset(inode));
1128            iinfo->i_lenAlloc = newsize;
1129            truncate_setsize(inode, newsize);
1130            up_write(&iinfo->i_data_sem);
1131            goto update_time;
1132        }
1133        err = block_truncate_page(inode->i_mapping, newsize,
1134                      udf_get_block);
1135        if (err)
1136            return err;
1137        down_write(&iinfo->i_data_sem);
1138        truncate_setsize(inode, newsize);
1139        udf_truncate_extents(inode);
1140        up_write(&iinfo->i_data_sem);
1141    }
1142update_time:
1143    inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1144    if (IS_SYNC(inode))
1145        udf_sync_inode(inode);
1146    else
1147        mark_inode_dirty(inode);
1148    return 0;
1149}
1150
1151static void __udf_read_inode(struct inode *inode)
1152{
1153    struct buffer_head *bh = NULL;
1154    struct fileEntry *fe;
1155    uint16_t ident;
1156    struct udf_inode_info *iinfo = UDF_I(inode);
1157
1158    /*
1159     * Set defaults, but the inode is still incomplete!
1160     * Note: get_new_inode() sets the following on a new inode:
1161     * i_sb = sb
1162     * i_no = ino
1163     * i_flags = sb->s_flags
1164     * i_state = 0
1165     * clean_inode(): zero fills and sets
1166     * i_count = 1
1167     * i_nlink = 1
1168     * i_op = NULL;
1169     */
1170    bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1171    if (!bh) {
1172        printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1173               inode->i_ino);
1174        make_bad_inode(inode);
1175        return;
1176    }
1177
1178    if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1179        ident != TAG_IDENT_USE) {
1180        printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1181                "failed ident=%d\n", inode->i_ino, ident);
1182        brelse(bh);
1183        make_bad_inode(inode);
1184        return;
1185    }
1186
1187    fe = (struct fileEntry *)bh->b_data;
1188
1189    if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1190        struct buffer_head *ibh;
1191
1192        ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1193                    &ident);
1194        if (ident == TAG_IDENT_IE && ibh) {
1195            struct buffer_head *nbh = NULL;
1196            struct kernel_lb_addr loc;
1197            struct indirectEntry *ie;
1198
1199            ie = (struct indirectEntry *)ibh->b_data;
1200            loc = lelb_to_cpu(ie->indirectICB.extLocation);
1201
1202            if (ie->indirectICB.extLength &&
1203                (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1204                            &ident))) {
1205                if (ident == TAG_IDENT_FE ||
1206                    ident == TAG_IDENT_EFE) {
1207                    memcpy(&iinfo->i_location,
1208                        &loc,
1209                        sizeof(struct kernel_lb_addr));
1210                    brelse(bh);
1211                    brelse(ibh);
1212                    brelse(nbh);
1213                    __udf_read_inode(inode);
1214                    return;
1215                }
1216                brelse(nbh);
1217            }
1218        }
1219        brelse(ibh);
1220    } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1221        printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1222               le16_to_cpu(fe->icbTag.strategyType));
1223        brelse(bh);
1224        make_bad_inode(inode);
1225        return;
1226    }
1227    udf_fill_inode(inode, bh);
1228
1229    brelse(bh);
1230}
1231
1232static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1233{
1234    struct fileEntry *fe;
1235    struct extendedFileEntry *efe;
1236    int offset;
1237    struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1238    struct udf_inode_info *iinfo = UDF_I(inode);
1239
1240    fe = (struct fileEntry *)bh->b_data;
1241    efe = (struct extendedFileEntry *)bh->b_data;
1242
1243    if (fe->icbTag.strategyType == cpu_to_le16(4))
1244        iinfo->i_strat4096 = 0;
1245    else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1246        iinfo->i_strat4096 = 1;
1247
1248    iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1249                            ICBTAG_FLAG_AD_MASK;
1250    iinfo->i_unique = 0;
1251    iinfo->i_lenEAttr = 0;
1252    iinfo->i_lenExtents = 0;
1253    iinfo->i_lenAlloc = 0;
1254    iinfo->i_next_alloc_block = 0;
1255    iinfo->i_next_alloc_goal = 0;
1256    if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1257        iinfo->i_efe = 1;
1258        iinfo->i_use = 0;
1259        if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1260                    sizeof(struct extendedFileEntry))) {
1261            make_bad_inode(inode);
1262            return;
1263        }
1264        memcpy(iinfo->i_ext.i_data,
1265               bh->b_data + sizeof(struct extendedFileEntry),
1266               inode->i_sb->s_blocksize -
1267                    sizeof(struct extendedFileEntry));
1268    } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1269        iinfo->i_efe = 0;
1270        iinfo->i_use = 0;
1271        if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1272                        sizeof(struct fileEntry))) {
1273            make_bad_inode(inode);
1274            return;
1275        }
1276        memcpy(iinfo->i_ext.i_data,
1277               bh->b_data + sizeof(struct fileEntry),
1278               inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1279    } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1280        iinfo->i_efe = 0;
1281        iinfo->i_use = 1;
1282        iinfo->i_lenAlloc = le32_to_cpu(
1283                ((struct unallocSpaceEntry *)bh->b_data)->
1284                 lengthAllocDescs);
1285        if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1286                    sizeof(struct unallocSpaceEntry))) {
1287            make_bad_inode(inode);
1288            return;
1289        }
1290        memcpy(iinfo->i_ext.i_data,
1291               bh->b_data + sizeof(struct unallocSpaceEntry),
1292               inode->i_sb->s_blocksize -
1293                    sizeof(struct unallocSpaceEntry));
1294        return;
1295    }
1296
1297    read_lock(&sbi->s_cred_lock);
1298    inode->i_uid = le32_to_cpu(fe->uid);
1299    if (inode->i_uid == -1 ||
1300        UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1301        UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1302        inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1303
1304    inode->i_gid = le32_to_cpu(fe->gid);
1305    if (inode->i_gid == -1 ||
1306        UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1307        UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1308        inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1309
1310    if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1311            sbi->s_fmode != UDF_INVALID_MODE)
1312        inode->i_mode = sbi->s_fmode;
1313    else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1314            sbi->s_dmode != UDF_INVALID_MODE)
1315        inode->i_mode = sbi->s_dmode;
1316    else
1317        inode->i_mode = udf_convert_permissions(fe);
1318    inode->i_mode &= ~sbi->s_umask;
1319    read_unlock(&sbi->s_cred_lock);
1320
1321    inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1322    if (!inode->i_nlink)
1323        inode->i_nlink = 1;
1324
1325    inode->i_size = le64_to_cpu(fe->informationLength);
1326    iinfo->i_lenExtents = inode->i_size;
1327
1328    if (iinfo->i_efe == 0) {
1329        inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1330            (inode->i_sb->s_blocksize_bits - 9);
1331
1332        if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1333            inode->i_atime = sbi->s_record_time;
1334
1335        if (!udf_disk_stamp_to_time(&inode->i_mtime,
1336                        fe->modificationTime))
1337            inode->i_mtime = sbi->s_record_time;
1338
1339        if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1340            inode->i_ctime = sbi->s_record_time;
1341
1342        iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1343        iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1344        iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1345        offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1346    } else {
1347        inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1348            (inode->i_sb->s_blocksize_bits - 9);
1349
1350        if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1351            inode->i_atime = sbi->s_record_time;
1352
1353        if (!udf_disk_stamp_to_time(&inode->i_mtime,
1354                        efe->modificationTime))
1355            inode->i_mtime = sbi->s_record_time;
1356
1357        if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1358            iinfo->i_crtime = sbi->s_record_time;
1359
1360        if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1361            inode->i_ctime = sbi->s_record_time;
1362
1363        iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1364        iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1365        iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1366        offset = sizeof(struct extendedFileEntry) +
1367                            iinfo->i_lenEAttr;
1368    }
1369
1370    switch (fe->icbTag.fileType) {
1371    case ICBTAG_FILE_TYPE_DIRECTORY:
1372        inode->i_op = &udf_dir_inode_operations;
1373        inode->i_fop = &udf_dir_operations;
1374        inode->i_mode |= S_IFDIR;
1375        inc_nlink(inode);
1376        break;
1377    case ICBTAG_FILE_TYPE_REALTIME:
1378    case ICBTAG_FILE_TYPE_REGULAR:
1379    case ICBTAG_FILE_TYPE_UNDEF:
1380    case ICBTAG_FILE_TYPE_VAT20:
1381        if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1382            inode->i_data.a_ops = &udf_adinicb_aops;
1383        else
1384            inode->i_data.a_ops = &udf_aops;
1385        inode->i_op = &udf_file_inode_operations;
1386        inode->i_fop = &udf_file_operations;
1387        inode->i_mode |= S_IFREG;
1388        break;
1389    case ICBTAG_FILE_TYPE_BLOCK:
1390        inode->i_mode |= S_IFBLK;
1391        break;
1392    case ICBTAG_FILE_TYPE_CHAR:
1393        inode->i_mode |= S_IFCHR;
1394        break;
1395    case ICBTAG_FILE_TYPE_FIFO:
1396        init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1397        break;
1398    case ICBTAG_FILE_TYPE_SOCKET:
1399        init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1400        break;
1401    case ICBTAG_FILE_TYPE_SYMLINK:
1402        inode->i_data.a_ops = &udf_symlink_aops;
1403        inode->i_op = &udf_symlink_inode_operations;
1404        inode->i_mode = S_IFLNK | S_IRWXUGO;
1405        break;
1406    case ICBTAG_FILE_TYPE_MAIN:
1407        udf_debug("METADATA FILE-----\n");
1408        break;
1409    case ICBTAG_FILE_TYPE_MIRROR:
1410        udf_debug("METADATA MIRROR FILE-----\n");
1411        break;
1412    case ICBTAG_FILE_TYPE_BITMAP:
1413        udf_debug("METADATA BITMAP FILE-----\n");
1414        break;
1415    default:
1416        printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1417                "file type=%d\n", inode->i_ino,
1418                fe->icbTag.fileType);
1419        make_bad_inode(inode);
1420        return;
1421    }
1422    if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1423        struct deviceSpec *dsea =
1424            (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1425        if (dsea) {
1426            init_special_inode(inode, inode->i_mode,
1427                MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1428                      le32_to_cpu(dsea->minorDeviceIdent)));
1429            /* Developer ID ??? */
1430        } else
1431            make_bad_inode(inode);
1432    }
1433}
1434
1435static int udf_alloc_i_data(struct inode *inode, size_t size)
1436{
1437    struct udf_inode_info *iinfo = UDF_I(inode);
1438    iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1439
1440    if (!iinfo->i_ext.i_data) {
1441        printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1442                "no free memory\n", inode->i_ino);
1443        return -ENOMEM;
1444    }
1445
1446    return 0;
1447}
1448
1449static mode_t udf_convert_permissions(struct fileEntry *fe)
1450{
1451    mode_t mode;
1452    uint32_t permissions;
1453    uint32_t flags;
1454
1455    permissions = le32_to_cpu(fe->permissions);
1456    flags = le16_to_cpu(fe->icbTag.flags);
1457
1458    mode = ((permissions) & S_IRWXO) |
1459        ((permissions >> 2) & S_IRWXG) |
1460        ((permissions >> 4) & S_IRWXU) |
1461        ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1462        ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1463        ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1464
1465    return mode;
1466}
1467
1468int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1469{
1470    return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1471}
1472
1473static int udf_sync_inode(struct inode *inode)
1474{
1475    return udf_update_inode(inode, 1);
1476}
1477
1478static int udf_update_inode(struct inode *inode, int do_sync)
1479{
1480    struct buffer_head *bh = NULL;
1481    struct fileEntry *fe;
1482    struct extendedFileEntry *efe;
1483    uint32_t udfperms;
1484    uint16_t icbflags;
1485    uint16_t crclen;
1486    int err = 0;
1487    struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1488    unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1489    struct udf_inode_info *iinfo = UDF_I(inode);
1490
1491    bh = udf_tgetblk(inode->i_sb,
1492            udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1493    if (!bh) {
1494        udf_debug("getblk failure\n");
1495        return -ENOMEM;
1496    }
1497
1498    lock_buffer(bh);
1499    memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1500    fe = (struct fileEntry *)bh->b_data;
1501    efe = (struct extendedFileEntry *)bh->b_data;
1502
1503    if (iinfo->i_use) {
1504        struct unallocSpaceEntry *use =
1505            (struct unallocSpaceEntry *)bh->b_data;
1506
1507        use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1508        memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1509               iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1510                    sizeof(struct unallocSpaceEntry));
1511        use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1512        use->descTag.tagLocation =
1513                cpu_to_le32(iinfo->i_location.logicalBlockNum);
1514        crclen = sizeof(struct unallocSpaceEntry) +
1515                iinfo->i_lenAlloc - sizeof(struct tag);
1516        use->descTag.descCRCLength = cpu_to_le16(crclen);
1517        use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1518                               sizeof(struct tag),
1519                               crclen));
1520        use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1521
1522        goto out;
1523    }
1524
1525    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1526        fe->uid = cpu_to_le32(-1);
1527    else
1528        fe->uid = cpu_to_le32(inode->i_uid);
1529
1530    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1531        fe->gid = cpu_to_le32(-1);
1532    else
1533        fe->gid = cpu_to_le32(inode->i_gid);
1534
1535    udfperms = ((inode->i_mode & S_IRWXO)) |
1536           ((inode->i_mode & S_IRWXG) << 2) |
1537           ((inode->i_mode & S_IRWXU) << 4);
1538
1539    udfperms |= (le32_to_cpu(fe->permissions) &
1540            (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1541             FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1542             FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1543    fe->permissions = cpu_to_le32(udfperms);
1544
1545    if (S_ISDIR(inode->i_mode))
1546        fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1547    else
1548        fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1549
1550    fe->informationLength = cpu_to_le64(inode->i_size);
1551
1552    if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1553        struct regid *eid;
1554        struct deviceSpec *dsea =
1555            (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1556        if (!dsea) {
1557            dsea = (struct deviceSpec *)
1558                udf_add_extendedattr(inode,
1559                             sizeof(struct deviceSpec) +
1560                             sizeof(struct regid), 12, 0x3);
1561            dsea->attrType = cpu_to_le32(12);
1562            dsea->attrSubtype = 1;
1563            dsea->attrLength = cpu_to_le32(
1564                        sizeof(struct deviceSpec) +
1565                        sizeof(struct regid));
1566            dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1567        }
1568        eid = (struct regid *)dsea->impUse;
1569        memset(eid, 0, sizeof(struct regid));
1570        strcpy(eid->ident, UDF_ID_DEVELOPER);
1571        eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1572        eid->identSuffix[1] = UDF_OS_ID_LINUX;
1573        dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1574        dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1575    }
1576
1577    if (iinfo->i_efe == 0) {
1578        memcpy(bh->b_data + sizeof(struct fileEntry),
1579               iinfo->i_ext.i_data,
1580               inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1581        fe->logicalBlocksRecorded = cpu_to_le64(
1582            (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1583            (blocksize_bits - 9));
1584
1585        udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1586        udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1587        udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1588        memset(&(fe->impIdent), 0, sizeof(struct regid));
1589        strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1590        fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1591        fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1592        fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1593        fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1594        fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1595        fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1596        crclen = sizeof(struct fileEntry);
1597    } else {
1598        memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1599               iinfo->i_ext.i_data,
1600               inode->i_sb->s_blocksize -
1601                    sizeof(struct extendedFileEntry));
1602        efe->objectSize = cpu_to_le64(inode->i_size);
1603        efe->logicalBlocksRecorded = cpu_to_le64(
1604            (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1605            (blocksize_bits - 9));
1606
1607        if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1608            (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1609             iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1610            iinfo->i_crtime = inode->i_atime;
1611
1612        if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1613            (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1614             iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1615            iinfo->i_crtime = inode->i_mtime;
1616
1617        if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1618            (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1619             iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1620            iinfo->i_crtime = inode->i_ctime;
1621
1622        udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1623        udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1624        udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1625        udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1626
1627        memset(&(efe->impIdent), 0, sizeof(struct regid));
1628        strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1629        efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1630        efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1631        efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1632        efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1633        efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1634        efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1635        crclen = sizeof(struct extendedFileEntry);
1636    }
1637    if (iinfo->i_strat4096) {
1638        fe->icbTag.strategyType = cpu_to_le16(4096);
1639        fe->icbTag.strategyParameter = cpu_to_le16(1);
1640        fe->icbTag.numEntries = cpu_to_le16(2);
1641    } else {
1642        fe->icbTag.strategyType = cpu_to_le16(4);
1643        fe->icbTag.numEntries = cpu_to_le16(1);
1644    }
1645
1646    if (S_ISDIR(inode->i_mode))
1647        fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1648    else if (S_ISREG(inode->i_mode))
1649        fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1650    else if (S_ISLNK(inode->i_mode))
1651        fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1652    else if (S_ISBLK(inode->i_mode))
1653        fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1654    else if (S_ISCHR(inode->i_mode))
1655        fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1656    else if (S_ISFIFO(inode->i_mode))
1657        fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1658    else if (S_ISSOCK(inode->i_mode))
1659        fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1660
1661    icbflags = iinfo->i_alloc_type |
1662            ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1663            ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1664            ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1665            (le16_to_cpu(fe->icbTag.flags) &
1666                ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1667                ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1668
1669    fe->icbTag.flags = cpu_to_le16(icbflags);
1670    if (sbi->s_udfrev >= 0x0200)
1671        fe->descTag.descVersion = cpu_to_le16(3);
1672    else
1673        fe->descTag.descVersion = cpu_to_le16(2);
1674    fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1675    fe->descTag.tagLocation = cpu_to_le32(
1676                    iinfo->i_location.logicalBlockNum);
1677    crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1678    fe->descTag.descCRCLength = cpu_to_le16(crclen);
1679    fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1680                          crclen));
1681    fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1682
1683out:
1684    set_buffer_uptodate(bh);
1685    unlock_buffer(bh);
1686
1687    /* write the data blocks */
1688    mark_buffer_dirty(bh);
1689    if (do_sync) {
1690        sync_dirty_buffer(bh);
1691        if (buffer_write_io_error(bh)) {
1692            printk(KERN_WARNING "IO error syncing udf inode "
1693                "[%s:%08lx]\n", inode->i_sb->s_id,
1694                inode->i_ino);
1695            err = -EIO;
1696        }
1697    }
1698    brelse(bh);
1699
1700    return err;
1701}
1702
1703struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1704{
1705    unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1706    struct inode *inode = iget_locked(sb, block);
1707
1708    if (!inode)
1709        return NULL;
1710
1711    if (inode->i_state & I_NEW) {
1712        memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1713        __udf_read_inode(inode);
1714        unlock_new_inode(inode);
1715    }
1716
1717    if (is_bad_inode(inode))
1718        goto out_iput;
1719
1720    if (ino->logicalBlockNum >= UDF_SB(sb)->
1721            s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1722        udf_debug("block=%d, partition=%d out of range\n",
1723              ino->logicalBlockNum, ino->partitionReferenceNum);
1724        make_bad_inode(inode);
1725        goto out_iput;
1726    }
1727
1728    return inode;
1729
1730 out_iput:
1731    iput(inode);
1732    return NULL;
1733}
1734
1735int udf_add_aext(struct inode *inode, struct extent_position *epos,
1736         struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1737{
1738    int adsize;
1739    struct short_ad *sad = NULL;
1740    struct long_ad *lad = NULL;
1741    struct allocExtDesc *aed;
1742    uint8_t *ptr;
1743    struct udf_inode_info *iinfo = UDF_I(inode);
1744
1745    if (!epos->bh)
1746        ptr = iinfo->i_ext.i_data + epos->offset -
1747            udf_file_entry_alloc_offset(inode) +
1748            iinfo->i_lenEAttr;
1749    else
1750        ptr = epos->bh->b_data + epos->offset;
1751
1752    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1753        adsize = sizeof(struct short_ad);
1754    else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1755        adsize = sizeof(struct long_ad);
1756    else
1757        return -EIO;
1758
1759    if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1760        unsigned char *sptr, *dptr;
1761        struct buffer_head *nbh;
1762        int err, loffset;
1763        struct kernel_lb_addr obloc = epos->block;
1764
1765        epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1766                        obloc.partitionReferenceNum,
1767                        obloc.logicalBlockNum, &err);
1768        if (!epos->block.logicalBlockNum)
1769            return -ENOSPC;
1770        nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1771                                 &epos->block,
1772                                 0));
1773        if (!nbh)
1774            return -EIO;
1775        lock_buffer(nbh);
1776        memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1777        set_buffer_uptodate(nbh);
1778        unlock_buffer(nbh);
1779        mark_buffer_dirty_inode(nbh, inode);
1780
1781        aed = (struct allocExtDesc *)(nbh->b_data);
1782        if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1783            aed->previousAllocExtLocation =
1784                    cpu_to_le32(obloc.logicalBlockNum);
1785        if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1786            loffset = epos->offset;
1787            aed->lengthAllocDescs = cpu_to_le32(adsize);
1788            sptr = ptr - adsize;
1789            dptr = nbh->b_data + sizeof(struct allocExtDesc);
1790            memcpy(dptr, sptr, adsize);
1791            epos->offset = sizeof(struct allocExtDesc) + adsize;
1792        } else {
1793            loffset = epos->offset + adsize;
1794            aed->lengthAllocDescs = cpu_to_le32(0);
1795            sptr = ptr;
1796            epos->offset = sizeof(struct allocExtDesc);
1797
1798            if (epos->bh) {
1799                aed = (struct allocExtDesc *)epos->bh->b_data;
1800                le32_add_cpu(&aed->lengthAllocDescs, adsize);
1801            } else {
1802                iinfo->i_lenAlloc += adsize;
1803                mark_inode_dirty(inode);
1804            }
1805        }
1806        if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1807            udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1808                    epos->block.logicalBlockNum, sizeof(struct tag));
1809        else
1810            udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1811                    epos->block.logicalBlockNum, sizeof(struct tag));
1812        switch (iinfo->i_alloc_type) {
1813        case ICBTAG_FLAG_AD_SHORT:
1814            sad = (struct short_ad *)sptr;
1815            sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1816                             inode->i_sb->s_blocksize);
1817            sad->extPosition =
1818                cpu_to_le32(epos->block.logicalBlockNum);
1819            break;
1820        case ICBTAG_FLAG_AD_LONG:
1821            lad = (struct long_ad *)sptr;
1822            lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1823                             inode->i_sb->s_blocksize);
1824            lad->extLocation = cpu_to_lelb(epos->block);
1825            memset(lad->impUse, 0x00, sizeof(lad->impUse));
1826            break;
1827        }
1828        if (epos->bh) {
1829            if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1830                UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1831                udf_update_tag(epos->bh->b_data, loffset);
1832            else
1833                udf_update_tag(epos->bh->b_data,
1834                        sizeof(struct allocExtDesc));
1835            mark_buffer_dirty_inode(epos->bh, inode);
1836            brelse(epos->bh);
1837        } else {
1838            mark_inode_dirty(inode);
1839        }
1840        epos->bh = nbh;
1841    }
1842
1843    udf_write_aext(inode, epos, eloc, elen, inc);
1844
1845    if (!epos->bh) {
1846        iinfo->i_lenAlloc += adsize;
1847        mark_inode_dirty(inode);
1848    } else {
1849        aed = (struct allocExtDesc *)epos->bh->b_data;
1850        le32_add_cpu(&aed->lengthAllocDescs, adsize);
1851        if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1852                UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1853            udf_update_tag(epos->bh->b_data,
1854                    epos->offset + (inc ? 0 : adsize));
1855        else
1856            udf_update_tag(epos->bh->b_data,
1857                    sizeof(struct allocExtDesc));
1858        mark_buffer_dirty_inode(epos->bh, inode);
1859    }
1860
1861    return 0;
1862}
1863
1864void udf_write_aext(struct inode *inode, struct extent_position *epos,
1865            struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1866{
1867    int adsize;
1868    uint8_t *ptr;
1869    struct short_ad *sad;
1870    struct long_ad *lad;
1871    struct udf_inode_info *iinfo = UDF_I(inode);
1872
1873    if (!epos->bh)
1874        ptr = iinfo->i_ext.i_data + epos->offset -
1875            udf_file_entry_alloc_offset(inode) +
1876            iinfo->i_lenEAttr;
1877    else
1878        ptr = epos->bh->b_data + epos->offset;
1879
1880    switch (iinfo->i_alloc_type) {
1881    case ICBTAG_FLAG_AD_SHORT:
1882        sad = (struct short_ad *)ptr;
1883        sad->extLength = cpu_to_le32(elen);
1884        sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1885        adsize = sizeof(struct short_ad);
1886        break;
1887    case ICBTAG_FLAG_AD_LONG:
1888        lad = (struct long_ad *)ptr;
1889        lad->extLength = cpu_to_le32(elen);
1890        lad->extLocation = cpu_to_lelb(*eloc);
1891        memset(lad->impUse, 0x00, sizeof(lad->impUse));
1892        adsize = sizeof(struct long_ad);
1893        break;
1894    default:
1895        return;
1896    }
1897
1898    if (epos->bh) {
1899        if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1900            UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1901            struct allocExtDesc *aed =
1902                (struct allocExtDesc *)epos->bh->b_data;
1903            udf_update_tag(epos->bh->b_data,
1904                       le32_to_cpu(aed->lengthAllocDescs) +
1905                       sizeof(struct allocExtDesc));
1906        }
1907        mark_buffer_dirty_inode(epos->bh, inode);
1908    } else {
1909        mark_inode_dirty(inode);
1910    }
1911
1912    if (inc)
1913        epos->offset += adsize;
1914}
1915
1916int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1917             struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1918{
1919    int8_t etype;
1920
1921    while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1922           (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1923        int block;
1924        epos->block = *eloc;
1925        epos->offset = sizeof(struct allocExtDesc);
1926        brelse(epos->bh);
1927        block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1928        epos->bh = udf_tread(inode->i_sb, block);
1929        if (!epos->bh) {
1930            udf_debug("reading block %d failed!\n", block);
1931            return -1;
1932        }
1933    }
1934
1935    return etype;
1936}
1937
1938int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1939            struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1940{
1941    int alen;
1942    int8_t etype;
1943    uint8_t *ptr;
1944    struct short_ad *sad;
1945    struct long_ad *lad;
1946    struct udf_inode_info *iinfo = UDF_I(inode);
1947
1948    if (!epos->bh) {
1949        if (!epos->offset)
1950            epos->offset = udf_file_entry_alloc_offset(inode);
1951        ptr = iinfo->i_ext.i_data + epos->offset -
1952            udf_file_entry_alloc_offset(inode) +
1953            iinfo->i_lenEAttr;
1954        alen = udf_file_entry_alloc_offset(inode) +
1955                            iinfo->i_lenAlloc;
1956    } else {
1957        if (!epos->offset)
1958            epos->offset = sizeof(struct allocExtDesc);
1959        ptr = epos->bh->b_data + epos->offset;
1960        alen = sizeof(struct allocExtDesc) +
1961            le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1962                            lengthAllocDescs);
1963    }
1964
1965    switch (iinfo->i_alloc_type) {
1966    case ICBTAG_FLAG_AD_SHORT:
1967        sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1968        if (!sad)
1969            return -1;
1970        etype = le32_to_cpu(sad->extLength) >> 30;
1971        eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1972        eloc->partitionReferenceNum =
1973                iinfo->i_location.partitionReferenceNum;
1974        *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1975        break;
1976    case ICBTAG_FLAG_AD_LONG:
1977        lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1978        if (!lad)
1979            return -1;
1980        etype = le32_to_cpu(lad->extLength) >> 30;
1981        *eloc = lelb_to_cpu(lad->extLocation);
1982        *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1983        break;
1984    default:
1985        udf_debug("alloc_type = %d unsupported\n",
1986                iinfo->i_alloc_type);
1987        return -1;
1988    }
1989
1990    return etype;
1991}
1992
1993static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1994                  struct kernel_lb_addr neloc, uint32_t nelen)
1995{
1996    struct kernel_lb_addr oeloc;
1997    uint32_t oelen;
1998    int8_t etype;
1999
2000    if (epos.bh)
2001        get_bh(epos.bh);
2002
2003    while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2004        udf_write_aext(inode, &epos, &neloc, nelen, 1);
2005        neloc = oeloc;
2006        nelen = (etype << 30) | oelen;
2007    }
2008    udf_add_aext(inode, &epos, &neloc, nelen, 1);
2009    brelse(epos.bh);
2010
2011    return (nelen >> 30);
2012}
2013
2014int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2015               struct kernel_lb_addr eloc, uint32_t elen)
2016{
2017    struct extent_position oepos;
2018    int adsize;
2019    int8_t etype;
2020    struct allocExtDesc *aed;
2021    struct udf_inode_info *iinfo;
2022
2023    if (epos.bh) {
2024        get_bh(epos.bh);
2025        get_bh(epos.bh);
2026    }
2027
2028    iinfo = UDF_I(inode);
2029    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2030        adsize = sizeof(struct short_ad);
2031    else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2032        adsize = sizeof(struct long_ad);
2033    else
2034        adsize = 0;
2035
2036    oepos = epos;
2037    if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2038        return -1;
2039
2040    while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2041        udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2042        if (oepos.bh != epos.bh) {
2043            oepos.block = epos.block;
2044            brelse(oepos.bh);
2045            get_bh(epos.bh);
2046            oepos.bh = epos.bh;
2047            oepos.offset = epos.offset - adsize;
2048        }
2049    }
2050    memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2051    elen = 0;
2052
2053    if (epos.bh != oepos.bh) {
2054        udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2055        udf_write_aext(inode, &oepos, &eloc, elen, 1);
2056        udf_write_aext(inode, &oepos, &eloc, elen, 1);
2057        if (!oepos.bh) {
2058            iinfo->i_lenAlloc -= (adsize * 2);
2059            mark_inode_dirty(inode);
2060        } else {
2061            aed = (struct allocExtDesc *)oepos.bh->b_data;
2062            le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2063            if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2064                UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2065                udf_update_tag(oepos.bh->b_data,
2066                        oepos.offset - (2 * adsize));
2067            else
2068                udf_update_tag(oepos.bh->b_data,
2069                        sizeof(struct allocExtDesc));
2070            mark_buffer_dirty_inode(oepos.bh, inode);
2071        }
2072    } else {
2073        udf_write_aext(inode, &oepos, &eloc, elen, 1);
2074        if (!oepos.bh) {
2075            iinfo->i_lenAlloc -= adsize;
2076            mark_inode_dirty(inode);
2077        } else {
2078            aed = (struct allocExtDesc *)oepos.bh->b_data;
2079            le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2080            if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2081                UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2082                udf_update_tag(oepos.bh->b_data,
2083                        epos.offset - adsize);
2084            else
2085                udf_update_tag(oepos.bh->b_data,
2086                        sizeof(struct allocExtDesc));
2087            mark_buffer_dirty_inode(oepos.bh, inode);
2088        }
2089    }
2090
2091    brelse(epos.bh);
2092    brelse(oepos.bh);
2093
2094    return (elen >> 30);
2095}
2096
2097int8_t inode_bmap(struct inode *inode, sector_t block,
2098          struct extent_position *pos, struct kernel_lb_addr *eloc,
2099          uint32_t *elen, sector_t *offset)
2100{
2101    unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2102    loff_t lbcount = 0, bcount =
2103        (loff_t) block << blocksize_bits;
2104    int8_t etype;
2105    struct udf_inode_info *iinfo;
2106
2107    iinfo = UDF_I(inode);
2108    pos->offset = 0;
2109    pos->block = iinfo->i_location;
2110    pos->bh = NULL;
2111    *elen = 0;
2112
2113    do {
2114        etype = udf_next_aext(inode, pos, eloc, elen, 1);
2115        if (etype == -1) {
2116            *offset = (bcount - lbcount) >> blocksize_bits;
2117            iinfo->i_lenExtents = lbcount;
2118            return -1;
2119        }
2120        lbcount += *elen;
2121    } while (lbcount <= bcount);
2122
2123    *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2124
2125    return etype;
2126}
2127
2128long udf_block_map(struct inode *inode, sector_t block)
2129{
2130    struct kernel_lb_addr eloc;
2131    uint32_t elen;
2132    sector_t offset;
2133    struct extent_position epos = {};
2134    int ret;
2135
2136    down_read(&UDF_I(inode)->i_data_sem);
2137
2138    if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2139                        (EXT_RECORDED_ALLOCATED >> 30))
2140        ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2141    else
2142        ret = 0;
2143
2144    up_read(&UDF_I(inode)->i_data_sem);
2145    brelse(epos.bh);
2146
2147    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2148        return udf_fixed_to_variable(ret);
2149    else
2150        return ret;
2151}
2152

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