Root/fs/udf/namei.c

1/*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name 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) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22#include "udfdecl.h"
23
24#include "udf_i.h"
25#include "udf_sb.h"
26#include <linux/string.h>
27#include <linux/errno.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
30#include <linux/buffer_head.h>
31#include <linux/sched.h>
32#include <linux/crc-itu-t.h>
33#include <linux/exportfs.h>
34
35enum { UDF_MAX_LINKS = 0xffff };
36
37static inline int udf_match(int len1, const unsigned char *name1, int len2,
38                const unsigned char *name2)
39{
40    if (len1 != len2)
41        return 0;
42
43    return !memcmp(name1, name2, len1);
44}
45
46int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
47         struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
48         uint8_t *impuse, uint8_t *fileident)
49{
50    uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
51    uint16_t crc;
52    int offset;
53    uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
54    uint8_t lfi = cfi->lengthFileIdent;
55    int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
56        sizeof(struct fileIdentDesc);
57    int adinicb = 0;
58
59    if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
60        adinicb = 1;
61
62    offset = fibh->soffset + sizeof(struct fileIdentDesc);
63
64    if (impuse) {
65        if (adinicb || (offset + liu < 0)) {
66            memcpy((uint8_t *)sfi->impUse, impuse, liu);
67        } else if (offset >= 0) {
68            memcpy(fibh->ebh->b_data + offset, impuse, liu);
69        } else {
70            memcpy((uint8_t *)sfi->impUse, impuse, -offset);
71            memcpy(fibh->ebh->b_data, impuse - offset,
72                liu + offset);
73        }
74    }
75
76    offset += liu;
77
78    if (fileident) {
79        if (adinicb || (offset + lfi < 0)) {
80            memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
81        } else if (offset >= 0) {
82            memcpy(fibh->ebh->b_data + offset, fileident, lfi);
83        } else {
84            memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
85                -offset);
86            memcpy(fibh->ebh->b_data, fileident - offset,
87                lfi + offset);
88        }
89    }
90
91    offset += lfi;
92
93    if (adinicb || (offset + padlen < 0)) {
94        memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
95    } else if (offset >= 0) {
96        memset(fibh->ebh->b_data + offset, 0x00, padlen);
97    } else {
98        memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
99        memset(fibh->ebh->b_data, 0x00, padlen + offset);
100    }
101
102    crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
103              sizeof(struct fileIdentDesc) - sizeof(struct tag));
104
105    if (fibh->sbh == fibh->ebh) {
106        crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
107                  crclen + sizeof(struct tag) -
108                  sizeof(struct fileIdentDesc));
109    } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
110        crc = crc_itu_t(crc, fibh->ebh->b_data +
111                    sizeof(struct fileIdentDesc) +
112                    fibh->soffset,
113                  crclen + sizeof(struct tag) -
114                    sizeof(struct fileIdentDesc));
115    } else {
116        crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
117                  -fibh->soffset - sizeof(struct fileIdentDesc));
118        crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
119    }
120
121    cfi->descTag.descCRC = cpu_to_le16(crc);
122    cfi->descTag.descCRCLength = cpu_to_le16(crclen);
123    cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
124
125    if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
126        memcpy((uint8_t *)sfi, (uint8_t *)cfi,
127            sizeof(struct fileIdentDesc));
128    } else {
129        memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
130        memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
131               sizeof(struct fileIdentDesc) + fibh->soffset);
132    }
133
134    if (adinicb) {
135        mark_inode_dirty(inode);
136    } else {
137        if (fibh->sbh != fibh->ebh)
138            mark_buffer_dirty_inode(fibh->ebh, inode);
139        mark_buffer_dirty_inode(fibh->sbh, inode);
140    }
141    return 0;
142}
143
144static struct fileIdentDesc *udf_find_entry(struct inode *dir,
145                        const struct qstr *child,
146                        struct udf_fileident_bh *fibh,
147                        struct fileIdentDesc *cfi)
148{
149    struct fileIdentDesc *fi = NULL;
150    loff_t f_pos;
151    int block, flen;
152    unsigned char *fname = NULL;
153    unsigned char *nameptr;
154    uint8_t lfi;
155    uint16_t liu;
156    loff_t size;
157    struct kernel_lb_addr eloc;
158    uint32_t elen;
159    sector_t offset;
160    struct extent_position epos = {};
161    struct udf_inode_info *dinfo = UDF_I(dir);
162    int isdotdot = child->len == 2 &&
163        child->name[0] == '.' && child->name[1] == '.';
164
165    size = udf_ext0_offset(dir) + dir->i_size;
166    f_pos = udf_ext0_offset(dir);
167
168    fibh->sbh = fibh->ebh = NULL;
169    fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
170    if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
171        if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
172            &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
173            goto out_err;
174        block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
175        if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
176            if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
177                epos.offset -= sizeof(struct short_ad);
178            else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
179                epos.offset -= sizeof(struct long_ad);
180        } else
181            offset = 0;
182
183        fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
184        if (!fibh->sbh)
185            goto out_err;
186    }
187
188    fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
189    if (!fname)
190        goto out_err;
191
192    while (f_pos < size) {
193        fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
194                    &elen, &offset);
195        if (!fi)
196            goto out_err;
197
198        liu = le16_to_cpu(cfi->lengthOfImpUse);
199        lfi = cfi->lengthFileIdent;
200
201        if (fibh->sbh == fibh->ebh) {
202            nameptr = fi->fileIdent + liu;
203        } else {
204            int poffset; /* Unpaded ending offset */
205
206            poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
207                    liu + lfi;
208
209            if (poffset >= lfi)
210                nameptr = (uint8_t *)(fibh->ebh->b_data +
211                              poffset - lfi);
212            else {
213                nameptr = fname;
214                memcpy(nameptr, fi->fileIdent + liu,
215                    lfi - poffset);
216                memcpy(nameptr + lfi - poffset,
217                    fibh->ebh->b_data, poffset);
218            }
219        }
220
221        if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
222            if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
223                continue;
224        }
225
226        if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
227            if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
228                continue;
229        }
230
231        if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
232            isdotdot)
233            goto out_ok;
234
235        if (!lfi)
236            continue;
237
238        flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
239        if (flen && udf_match(flen, fname, child->len, child->name))
240            goto out_ok;
241    }
242
243out_err:
244    fi = NULL;
245    if (fibh->sbh != fibh->ebh)
246        brelse(fibh->ebh);
247    brelse(fibh->sbh);
248out_ok:
249    brelse(epos.bh);
250    kfree(fname);
251
252    return fi;
253}
254
255static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
256                 struct nameidata *nd)
257{
258    struct inode *inode = NULL;
259    struct fileIdentDesc cfi;
260    struct udf_fileident_bh fibh;
261
262    if (dentry->d_name.len > UDF_NAME_LEN - 2)
263        return ERR_PTR(-ENAMETOOLONG);
264
265#ifdef UDF_RECOVERY
266    /* temporary shorthand for specifying files by inode number */
267    if (!strncmp(dentry->d_name.name, ".B=", 3)) {
268        struct kernel_lb_addr lb = {
269            .logicalBlockNum = 0,
270            .partitionReferenceNum =
271                simple_strtoul(dentry->d_name.name + 3,
272                        NULL, 0),
273        };
274        inode = udf_iget(dir->i_sb, lb);
275        if (!inode) {
276            return ERR_PTR(-EACCES);
277        }
278    } else
279#endif /* UDF_RECOVERY */
280
281    if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
282        struct kernel_lb_addr loc;
283
284        if (fibh.sbh != fibh.ebh)
285            brelse(fibh.ebh);
286        brelse(fibh.sbh);
287
288        loc = lelb_to_cpu(cfi.icb.extLocation);
289        inode = udf_iget(dir->i_sb, &loc);
290        if (!inode) {
291            return ERR_PTR(-EACCES);
292        }
293    }
294
295    return d_splice_alias(inode, dentry);
296}
297
298static struct fileIdentDesc *udf_add_entry(struct inode *dir,
299                       struct dentry *dentry,
300                       struct udf_fileident_bh *fibh,
301                       struct fileIdentDesc *cfi, int *err)
302{
303    struct super_block *sb = dir->i_sb;
304    struct fileIdentDesc *fi = NULL;
305    unsigned char *name = NULL;
306    int namelen;
307    loff_t f_pos;
308    loff_t size = udf_ext0_offset(dir) + dir->i_size;
309    int nfidlen;
310    uint8_t lfi;
311    uint16_t liu;
312    int block;
313    struct kernel_lb_addr eloc;
314    uint32_t elen = 0;
315    sector_t offset;
316    struct extent_position epos = {};
317    struct udf_inode_info *dinfo;
318
319    fibh->sbh = fibh->ebh = NULL;
320    name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
321    if (!name) {
322        *err = -ENOMEM;
323        goto out_err;
324    }
325
326    if (dentry) {
327        if (!dentry->d_name.len) {
328            *err = -EINVAL;
329            goto out_err;
330        }
331        namelen = udf_put_filename(sb, dentry->d_name.name, name,
332                         dentry->d_name.len);
333        if (!namelen) {
334            *err = -ENAMETOOLONG;
335            goto out_err;
336        }
337    } else {
338        namelen = 0;
339    }
340
341    nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
342
343    f_pos = udf_ext0_offset(dir);
344
345    fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
346    dinfo = UDF_I(dir);
347    if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
348        if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
349            &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
350            block = udf_get_lb_pblock(dir->i_sb,
351                    &dinfo->i_location, 0);
352            fibh->soffset = fibh->eoffset = sb->s_blocksize;
353            goto add;
354        }
355        block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
356        if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
357            if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
358                epos.offset -= sizeof(struct short_ad);
359            else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
360                epos.offset -= sizeof(struct long_ad);
361        } else
362            offset = 0;
363
364        fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
365        if (!fibh->sbh) {
366            *err = -EIO;
367            goto out_err;
368        }
369
370        block = dinfo->i_location.logicalBlockNum;
371    }
372
373    while (f_pos < size) {
374        fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
375                    &elen, &offset);
376
377        if (!fi) {
378            *err = -EIO;
379            goto out_err;
380        }
381
382        liu = le16_to_cpu(cfi->lengthOfImpUse);
383        lfi = cfi->lengthFileIdent;
384
385        if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
386            if (((sizeof(struct fileIdentDesc) +
387                    liu + lfi + 3) & ~3) == nfidlen) {
388                cfi->descTag.tagSerialNum = cpu_to_le16(1);
389                cfi->fileVersionNum = cpu_to_le16(1);
390                cfi->fileCharacteristics = 0;
391                cfi->lengthFileIdent = namelen;
392                cfi->lengthOfImpUse = cpu_to_le16(0);
393                if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
394                          name))
395                    goto out_ok;
396                else {
397                    *err = -EIO;
398                    goto out_err;
399                }
400            }
401        }
402    }
403
404add:
405    f_pos += nfidlen;
406
407    if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
408        sb->s_blocksize - fibh->eoffset < nfidlen) {
409        brelse(epos.bh);
410        epos.bh = NULL;
411        fibh->soffset -= udf_ext0_offset(dir);
412        fibh->eoffset -= udf_ext0_offset(dir);
413        f_pos -= udf_ext0_offset(dir);
414        if (fibh->sbh != fibh->ebh)
415            brelse(fibh->ebh);
416        brelse(fibh->sbh);
417        fibh->sbh = fibh->ebh =
418                udf_expand_dir_adinicb(dir, &block, err);
419        if (!fibh->sbh)
420            goto out_err;
421        epos.block = dinfo->i_location;
422        epos.offset = udf_file_entry_alloc_offset(dir);
423        /* Load extent udf_expand_dir_adinicb() has created */
424        udf_current_aext(dir, &epos, &eloc, &elen, 1);
425    }
426
427    /* Entry fits into current block? */
428    if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
429        fibh->soffset = fibh->eoffset;
430        fibh->eoffset += nfidlen;
431        if (fibh->sbh != fibh->ebh) {
432            brelse(fibh->sbh);
433            fibh->sbh = fibh->ebh;
434        }
435
436        if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
437            block = dinfo->i_location.logicalBlockNum;
438            fi = (struct fileIdentDesc *)
439                    (dinfo->i_ext.i_data +
440                     fibh->soffset -
441                     udf_ext0_offset(dir) +
442                     dinfo->i_lenEAttr);
443        } else {
444            block = eloc.logicalBlockNum +
445                    ((elen - 1) >>
446                        dir->i_sb->s_blocksize_bits);
447            fi = (struct fileIdentDesc *)
448                (fibh->sbh->b_data + fibh->soffset);
449        }
450    } else {
451        /* Round up last extent in the file */
452        elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
453        if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
454            epos.offset -= sizeof(struct short_ad);
455        else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
456            epos.offset -= sizeof(struct long_ad);
457        udf_write_aext(dir, &epos, &eloc, elen, 1);
458        dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
459                    - 1) & ~(sb->s_blocksize - 1);
460
461        fibh->soffset = fibh->eoffset - sb->s_blocksize;
462        fibh->eoffset += nfidlen - sb->s_blocksize;
463        if (fibh->sbh != fibh->ebh) {
464            brelse(fibh->sbh);
465            fibh->sbh = fibh->ebh;
466        }
467
468        block = eloc.logicalBlockNum + ((elen - 1) >>
469                        dir->i_sb->s_blocksize_bits);
470        fibh->ebh = udf_bread(dir,
471                f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
472        if (!fibh->ebh)
473            goto out_err;
474        /* Extents could have been merged, invalidate our position */
475        brelse(epos.bh);
476        epos.bh = NULL;
477        epos.block = dinfo->i_location;
478        epos.offset = udf_file_entry_alloc_offset(dir);
479
480        if (!fibh->soffset) {
481            /* Find the freshly allocated block */
482            while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
483                (EXT_RECORDED_ALLOCATED >> 30))
484                ;
485            block = eloc.logicalBlockNum + ((elen - 1) >>
486                    dir->i_sb->s_blocksize_bits);
487            brelse(fibh->sbh);
488            fibh->sbh = fibh->ebh;
489            fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
490        } else {
491            fi = (struct fileIdentDesc *)
492                (fibh->sbh->b_data + sb->s_blocksize +
493                    fibh->soffset);
494        }
495    }
496
497    memset(cfi, 0, sizeof(struct fileIdentDesc));
498    if (UDF_SB(sb)->s_udfrev >= 0x0200)
499        udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
500                sizeof(struct tag));
501    else
502        udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
503                sizeof(struct tag));
504    cfi->fileVersionNum = cpu_to_le16(1);
505    cfi->lengthFileIdent = namelen;
506    cfi->lengthOfImpUse = cpu_to_le16(0);
507    if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
508        dir->i_size += nfidlen;
509        if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
510            dinfo->i_lenAlloc += nfidlen;
511        else {
512            /* Find the last extent and truncate it to proper size */
513            while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
514                (EXT_RECORDED_ALLOCATED >> 30))
515                ;
516            elen -= dinfo->i_lenExtents - dir->i_size;
517            if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
518                epos.offset -= sizeof(struct short_ad);
519            else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
520                epos.offset -= sizeof(struct long_ad);
521            udf_write_aext(dir, &epos, &eloc, elen, 1);
522            dinfo->i_lenExtents = dir->i_size;
523        }
524
525        mark_inode_dirty(dir);
526        goto out_ok;
527    } else {
528        *err = -EIO;
529        goto out_err;
530    }
531
532out_err:
533    fi = NULL;
534    if (fibh->sbh != fibh->ebh)
535        brelse(fibh->ebh);
536    brelse(fibh->sbh);
537out_ok:
538    brelse(epos.bh);
539    kfree(name);
540    return fi;
541}
542
543static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
544                struct udf_fileident_bh *fibh,
545                struct fileIdentDesc *cfi)
546{
547    cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
548
549    if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
550        memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
551
552    return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
553}
554
555static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
556              struct nameidata *nd)
557{
558    struct udf_fileident_bh fibh;
559    struct inode *inode;
560    struct fileIdentDesc cfi, *fi;
561    int err;
562    struct udf_inode_info *iinfo;
563
564    inode = udf_new_inode(dir, mode, &err);
565    if (!inode) {
566        return err;
567    }
568
569    iinfo = UDF_I(inode);
570    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
571        inode->i_data.a_ops = &udf_adinicb_aops;
572    else
573        inode->i_data.a_ops = &udf_aops;
574    inode->i_op = &udf_file_inode_operations;
575    inode->i_fop = &udf_file_operations;
576    mark_inode_dirty(inode);
577
578    fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
579    if (!fi) {
580        inode->i_nlink--;
581        mark_inode_dirty(inode);
582        iput(inode);
583        return err;
584    }
585    cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
586    cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
587    *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
588        cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
589    udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
590    if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
591        mark_inode_dirty(dir);
592    if (fibh.sbh != fibh.ebh)
593        brelse(fibh.ebh);
594    brelse(fibh.sbh);
595    d_instantiate(dentry, inode);
596
597    return 0;
598}
599
600static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
601             dev_t rdev)
602{
603    struct inode *inode;
604    struct udf_fileident_bh fibh;
605    struct fileIdentDesc cfi, *fi;
606    int err;
607    struct udf_inode_info *iinfo;
608
609    if (!old_valid_dev(rdev))
610        return -EINVAL;
611
612    err = -EIO;
613    inode = udf_new_inode(dir, mode, &err);
614    if (!inode)
615        goto out;
616
617    iinfo = UDF_I(inode);
618    init_special_inode(inode, mode, rdev);
619    fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
620    if (!fi) {
621        inode->i_nlink--;
622        mark_inode_dirty(inode);
623        iput(inode);
624        return err;
625    }
626    cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
627    cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
628    *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
629        cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
630    udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
631    if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
632        mark_inode_dirty(dir);
633    mark_inode_dirty(inode);
634
635    if (fibh.sbh != fibh.ebh)
636        brelse(fibh.ebh);
637    brelse(fibh.sbh);
638    d_instantiate(dentry, inode);
639    err = 0;
640
641out:
642    return err;
643}
644
645static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
646{
647    struct inode *inode;
648    struct udf_fileident_bh fibh;
649    struct fileIdentDesc cfi, *fi;
650    int err;
651    struct udf_inode_info *dinfo = UDF_I(dir);
652    struct udf_inode_info *iinfo;
653
654    err = -EMLINK;
655    if (dir->i_nlink >= UDF_MAX_LINKS)
656        goto out;
657
658    err = -EIO;
659    inode = udf_new_inode(dir, S_IFDIR | mode, &err);
660    if (!inode)
661        goto out;
662
663    iinfo = UDF_I(inode);
664    inode->i_op = &udf_dir_inode_operations;
665    inode->i_fop = &udf_dir_operations;
666    fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
667    if (!fi) {
668        inode->i_nlink--;
669        mark_inode_dirty(inode);
670        iput(inode);
671        goto out;
672    }
673    inode->i_nlink = 2;
674    cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
675    cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
676    *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
677        cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
678    cfi.fileCharacteristics =
679            FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
680    udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
681    brelse(fibh.sbh);
682    mark_inode_dirty(inode);
683
684    fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
685    if (!fi) {
686        inode->i_nlink = 0;
687        mark_inode_dirty(inode);
688        iput(inode);
689        goto out;
690    }
691    cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
692    cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
693    *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
694        cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
695    cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
696    udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
697    inc_nlink(dir);
698    mark_inode_dirty(dir);
699    d_instantiate(dentry, inode);
700    if (fibh.sbh != fibh.ebh)
701        brelse(fibh.ebh);
702    brelse(fibh.sbh);
703    err = 0;
704
705out:
706    return err;
707}
708
709static int empty_dir(struct inode *dir)
710{
711    struct fileIdentDesc *fi, cfi;
712    struct udf_fileident_bh fibh;
713    loff_t f_pos;
714    loff_t size = udf_ext0_offset(dir) + dir->i_size;
715    int block;
716    struct kernel_lb_addr eloc;
717    uint32_t elen;
718    sector_t offset;
719    struct extent_position epos = {};
720    struct udf_inode_info *dinfo = UDF_I(dir);
721
722    f_pos = udf_ext0_offset(dir);
723    fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
724
725    if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
726        fibh.sbh = fibh.ebh = NULL;
727    else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
728                  &epos, &eloc, &elen, &offset) ==
729                    (EXT_RECORDED_ALLOCATED >> 30)) {
730        block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
731        if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
732            if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
733                epos.offset -= sizeof(struct short_ad);
734            else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
735                epos.offset -= sizeof(struct long_ad);
736        } else
737            offset = 0;
738
739        fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
740        if (!fibh.sbh) {
741            brelse(epos.bh);
742            return 0;
743        }
744    } else {
745        brelse(epos.bh);
746        return 0;
747    }
748
749    while (f_pos < size) {
750        fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
751                    &elen, &offset);
752        if (!fi) {
753            if (fibh.sbh != fibh.ebh)
754                brelse(fibh.ebh);
755            brelse(fibh.sbh);
756            brelse(epos.bh);
757            return 0;
758        }
759
760        if (cfi.lengthFileIdent &&
761            (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
762            if (fibh.sbh != fibh.ebh)
763                brelse(fibh.ebh);
764            brelse(fibh.sbh);
765            brelse(epos.bh);
766            return 0;
767        }
768    }
769
770    if (fibh.sbh != fibh.ebh)
771        brelse(fibh.ebh);
772    brelse(fibh.sbh);
773    brelse(epos.bh);
774
775    return 1;
776}
777
778static int udf_rmdir(struct inode *dir, struct dentry *dentry)
779{
780    int retval;
781    struct inode *inode = dentry->d_inode;
782    struct udf_fileident_bh fibh;
783    struct fileIdentDesc *fi, cfi;
784    struct kernel_lb_addr tloc;
785
786    retval = -ENOENT;
787    fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
788    if (!fi)
789        goto out;
790
791    retval = -EIO;
792    tloc = lelb_to_cpu(cfi.icb.extLocation);
793    if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
794        goto end_rmdir;
795    retval = -ENOTEMPTY;
796    if (!empty_dir(inode))
797        goto end_rmdir;
798    retval = udf_delete_entry(dir, fi, &fibh, &cfi);
799    if (retval)
800        goto end_rmdir;
801    if (inode->i_nlink != 2)
802        udf_warning(inode->i_sb, "udf_rmdir",
803                "empty directory has nlink != 2 (%d)",
804                inode->i_nlink);
805    clear_nlink(inode);
806    inode->i_size = 0;
807    inode_dec_link_count(dir);
808    inode->i_ctime = dir->i_ctime = dir->i_mtime =
809                        current_fs_time(dir->i_sb);
810    mark_inode_dirty(dir);
811
812end_rmdir:
813    if (fibh.sbh != fibh.ebh)
814        brelse(fibh.ebh);
815    brelse(fibh.sbh);
816
817out:
818    return retval;
819}
820
821static int udf_unlink(struct inode *dir, struct dentry *dentry)
822{
823    int retval;
824    struct inode *inode = dentry->d_inode;
825    struct udf_fileident_bh fibh;
826    struct fileIdentDesc *fi;
827    struct fileIdentDesc cfi;
828    struct kernel_lb_addr tloc;
829
830    retval = -ENOENT;
831    fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
832    if (!fi)
833        goto out;
834
835    retval = -EIO;
836    tloc = lelb_to_cpu(cfi.icb.extLocation);
837    if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
838        goto end_unlink;
839
840    if (!inode->i_nlink) {
841        udf_debug("Deleting nonexistent file (%lu), %d\n",
842              inode->i_ino, inode->i_nlink);
843        inode->i_nlink = 1;
844    }
845    retval = udf_delete_entry(dir, fi, &fibh, &cfi);
846    if (retval)
847        goto end_unlink;
848    dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
849    mark_inode_dirty(dir);
850    inode_dec_link_count(inode);
851    inode->i_ctime = dir->i_ctime;
852    retval = 0;
853
854end_unlink:
855    if (fibh.sbh != fibh.ebh)
856        brelse(fibh.ebh);
857    brelse(fibh.sbh);
858
859out:
860    return retval;
861}
862
863static int udf_symlink(struct inode *dir, struct dentry *dentry,
864               const char *symname)
865{
866    struct inode *inode;
867    struct pathComponent *pc;
868    const char *compstart;
869    struct udf_fileident_bh fibh;
870    struct extent_position epos = {};
871    int eoffset, elen = 0;
872    struct fileIdentDesc *fi;
873    struct fileIdentDesc cfi;
874    uint8_t *ea;
875    int err;
876    int block;
877    unsigned char *name = NULL;
878    int namelen;
879    struct udf_inode_info *iinfo;
880    struct super_block *sb = dir->i_sb;
881
882    inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
883    if (!inode)
884        goto out;
885
886    iinfo = UDF_I(inode);
887    down_write(&iinfo->i_data_sem);
888    name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
889    if (!name) {
890        err = -ENOMEM;
891        goto out_no_entry;
892    }
893
894    inode->i_data.a_ops = &udf_symlink_aops;
895    inode->i_op = &udf_symlink_inode_operations;
896
897    if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
898        struct kernel_lb_addr eloc;
899        uint32_t bsize;
900
901        block = udf_new_block(sb, inode,
902                iinfo->i_location.partitionReferenceNum,
903                iinfo->i_location.logicalBlockNum, &err);
904        if (!block)
905            goto out_no_entry;
906        epos.block = iinfo->i_location;
907        epos.offset = udf_file_entry_alloc_offset(inode);
908        epos.bh = NULL;
909        eloc.logicalBlockNum = block;
910        eloc.partitionReferenceNum =
911                iinfo->i_location.partitionReferenceNum;
912        bsize = sb->s_blocksize;
913        iinfo->i_lenExtents = bsize;
914        udf_add_aext(inode, &epos, &eloc, bsize, 0);
915        brelse(epos.bh);
916
917        block = udf_get_pblock(sb, block,
918                iinfo->i_location.partitionReferenceNum,
919                0);
920        epos.bh = udf_tgetblk(sb, block);
921        lock_buffer(epos.bh);
922        memset(epos.bh->b_data, 0x00, bsize);
923        set_buffer_uptodate(epos.bh);
924        unlock_buffer(epos.bh);
925        mark_buffer_dirty_inode(epos.bh, inode);
926        ea = epos.bh->b_data + udf_ext0_offset(inode);
927    } else
928        ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
929
930    eoffset = sb->s_blocksize - udf_ext0_offset(inode);
931    pc = (struct pathComponent *)ea;
932
933    if (*symname == '/') {
934        do {
935            symname++;
936        } while (*symname == '/');
937
938        pc->componentType = 1;
939        pc->lengthComponentIdent = 0;
940        pc->componentFileVersionNum = 0;
941        elen += sizeof(struct pathComponent);
942    }
943
944    err = -ENAMETOOLONG;
945
946    while (*symname) {
947        if (elen + sizeof(struct pathComponent) > eoffset)
948            goto out_no_entry;
949
950        pc = (struct pathComponent *)(ea + elen);
951
952        compstart = symname;
953
954        do {
955            symname++;
956        } while (*symname && *symname != '/');
957
958        pc->componentType = 5;
959        pc->lengthComponentIdent = 0;
960        pc->componentFileVersionNum = 0;
961        if (compstart[0] == '.') {
962            if ((symname - compstart) == 1)
963                pc->componentType = 4;
964            else if ((symname - compstart) == 2 &&
965                    compstart[1] == '.')
966                pc->componentType = 3;
967        }
968
969        if (pc->componentType == 5) {
970            namelen = udf_put_filename(sb, compstart, name,
971                           symname - compstart);
972            if (!namelen)
973                goto out_no_entry;
974
975            if (elen + sizeof(struct pathComponent) + namelen >
976                    eoffset)
977                goto out_no_entry;
978            else
979                pc->lengthComponentIdent = namelen;
980
981            memcpy(pc->componentIdent, name, namelen);
982        }
983
984        elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
985
986        if (*symname) {
987            do {
988                symname++;
989            } while (*symname == '/');
990        }
991    }
992
993    brelse(epos.bh);
994    inode->i_size = elen;
995    if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
996        iinfo->i_lenAlloc = inode->i_size;
997    else
998        udf_truncate_tail_extent(inode);
999    mark_inode_dirty(inode);
1000
1001    fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1002    if (!fi)
1003        goto out_no_entry;
1004    cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1005    cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1006    if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1007        *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1008            cpu_to_le32(lvid_get_unique_id(sb));
1009    }
1010    udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1011    if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012        mark_inode_dirty(dir);
1013    up_write(&iinfo->i_data_sem);
1014    if (fibh.sbh != fibh.ebh)
1015        brelse(fibh.ebh);
1016    brelse(fibh.sbh);
1017    d_instantiate(dentry, inode);
1018    err = 0;
1019
1020out:
1021    kfree(name);
1022    return err;
1023
1024out_no_entry:
1025    up_write(&iinfo->i_data_sem);
1026    inode_dec_link_count(inode);
1027    iput(inode);
1028    goto out;
1029}
1030
1031static int udf_link(struct dentry *old_dentry, struct inode *dir,
1032            struct dentry *dentry)
1033{
1034    struct inode *inode = old_dentry->d_inode;
1035    struct udf_fileident_bh fibh;
1036    struct fileIdentDesc cfi, *fi;
1037    int err;
1038
1039    if (inode->i_nlink >= UDF_MAX_LINKS)
1040        return -EMLINK;
1041
1042    fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1043    if (!fi) {
1044        return err;
1045    }
1046    cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1047    cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1048    if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1049        *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1050            cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1051    }
1052    udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1053    if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1054        mark_inode_dirty(dir);
1055
1056    if (fibh.sbh != fibh.ebh)
1057        brelse(fibh.ebh);
1058    brelse(fibh.sbh);
1059    inc_nlink(inode);
1060    inode->i_ctime = current_fs_time(inode->i_sb);
1061    mark_inode_dirty(inode);
1062    ihold(inode);
1063    d_instantiate(dentry, inode);
1064
1065    return 0;
1066}
1067
1068/* Anybody can rename anything with this: the permission checks are left to the
1069 * higher-level routines.
1070 */
1071static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1072              struct inode *new_dir, struct dentry *new_dentry)
1073{
1074    struct inode *old_inode = old_dentry->d_inode;
1075    struct inode *new_inode = new_dentry->d_inode;
1076    struct udf_fileident_bh ofibh, nfibh;
1077    struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1078    struct fileIdentDesc ocfi, ncfi;
1079    struct buffer_head *dir_bh = NULL;
1080    int retval = -ENOENT;
1081    struct kernel_lb_addr tloc;
1082    struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1083
1084    ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1085    if (ofi) {
1086        if (ofibh.sbh != ofibh.ebh)
1087            brelse(ofibh.ebh);
1088        brelse(ofibh.sbh);
1089    }
1090    tloc = lelb_to_cpu(ocfi.icb.extLocation);
1091    if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1092        != old_inode->i_ino)
1093        goto end_rename;
1094
1095    nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1096    if (nfi) {
1097        if (!new_inode) {
1098            if (nfibh.sbh != nfibh.ebh)
1099                brelse(nfibh.ebh);
1100            brelse(nfibh.sbh);
1101            nfi = NULL;
1102        }
1103    }
1104    if (S_ISDIR(old_inode->i_mode)) {
1105        int offset = udf_ext0_offset(old_inode);
1106
1107        if (new_inode) {
1108            retval = -ENOTEMPTY;
1109            if (!empty_dir(new_inode))
1110                goto end_rename;
1111        }
1112        retval = -EIO;
1113        if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1114            dir_fi = udf_get_fileident(
1115                    old_iinfo->i_ext.i_data -
1116                      (old_iinfo->i_efe ?
1117                       sizeof(struct extendedFileEntry) :
1118                       sizeof(struct fileEntry)),
1119                    old_inode->i_sb->s_blocksize, &offset);
1120        } else {
1121            dir_bh = udf_bread(old_inode, 0, 0, &retval);
1122            if (!dir_bh)
1123                goto end_rename;
1124            dir_fi = udf_get_fileident(dir_bh->b_data,
1125                    old_inode->i_sb->s_blocksize, &offset);
1126        }
1127        if (!dir_fi)
1128            goto end_rename;
1129        tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1130        if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1131                old_dir->i_ino)
1132            goto end_rename;
1133
1134        retval = -EMLINK;
1135        if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
1136            goto end_rename;
1137    }
1138    if (!nfi) {
1139        nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1140                    &retval);
1141        if (!nfi)
1142            goto end_rename;
1143    }
1144
1145    /*
1146     * Like most other Unix systems, set the ctime for inodes on a
1147     * rename.
1148     */
1149    old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1150    mark_inode_dirty(old_inode);
1151
1152    /*
1153     * ok, that's it
1154     */
1155    ncfi.fileVersionNum = ocfi.fileVersionNum;
1156    ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1157    memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1158    udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1159
1160    /* The old fid may have moved - find it again */
1161    ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1162    udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1163
1164    if (new_inode) {
1165        new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1166        inode_dec_link_count(new_inode);
1167    }
1168    old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1169    mark_inode_dirty(old_dir);
1170
1171    if (dir_fi) {
1172        dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1173        udf_update_tag((char *)dir_fi,
1174                (sizeof(struct fileIdentDesc) +
1175                le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1176        if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1177            mark_inode_dirty(old_inode);
1178        else
1179            mark_buffer_dirty_inode(dir_bh, old_inode);
1180
1181        inode_dec_link_count(old_dir);
1182        if (new_inode)
1183            inode_dec_link_count(new_inode);
1184        else {
1185            inc_nlink(new_dir);
1186            mark_inode_dirty(new_dir);
1187        }
1188    }
1189
1190    if (ofi) {
1191        if (ofibh.sbh != ofibh.ebh)
1192            brelse(ofibh.ebh);
1193        brelse(ofibh.sbh);
1194    }
1195
1196    retval = 0;
1197
1198end_rename:
1199    brelse(dir_bh);
1200    if (nfi) {
1201        if (nfibh.sbh != nfibh.ebh)
1202            brelse(nfibh.ebh);
1203        brelse(nfibh.sbh);
1204    }
1205
1206    return retval;
1207}
1208
1209static struct dentry *udf_get_parent(struct dentry *child)
1210{
1211    struct kernel_lb_addr tloc;
1212    struct inode *inode = NULL;
1213    struct qstr dotdot = {.name = "..", .len = 2};
1214    struct fileIdentDesc cfi;
1215    struct udf_fileident_bh fibh;
1216
1217    if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1218        goto out_unlock;
1219
1220    if (fibh.sbh != fibh.ebh)
1221        brelse(fibh.ebh);
1222    brelse(fibh.sbh);
1223
1224    tloc = lelb_to_cpu(cfi.icb.extLocation);
1225    inode = udf_iget(child->d_inode->i_sb, &tloc);
1226    if (!inode)
1227        goto out_unlock;
1228
1229    return d_obtain_alias(inode);
1230out_unlock:
1231    return ERR_PTR(-EACCES);
1232}
1233
1234
1235static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1236                    u16 partref, __u32 generation)
1237{
1238    struct inode *inode;
1239    struct kernel_lb_addr loc;
1240
1241    if (block == 0)
1242        return ERR_PTR(-ESTALE);
1243
1244    loc.logicalBlockNum = block;
1245    loc.partitionReferenceNum = partref;
1246    inode = udf_iget(sb, &loc);
1247
1248    if (inode == NULL)
1249        return ERR_PTR(-ENOMEM);
1250
1251    if (generation && inode->i_generation != generation) {
1252        iput(inode);
1253        return ERR_PTR(-ESTALE);
1254    }
1255    return d_obtain_alias(inode);
1256}
1257
1258static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1259                       struct fid *fid, int fh_len, int fh_type)
1260{
1261    if ((fh_len != 3 && fh_len != 5) ||
1262        (fh_type != FILEID_UDF_WITH_PARENT &&
1263         fh_type != FILEID_UDF_WITHOUT_PARENT))
1264        return NULL;
1265
1266    return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1267            fid->udf.generation);
1268}
1269
1270static struct dentry *udf_fh_to_parent(struct super_block *sb,
1271                       struct fid *fid, int fh_len, int fh_type)
1272{
1273    if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1274        return NULL;
1275
1276    return udf_nfs_get_inode(sb, fid->udf.parent_block,
1277                 fid->udf.parent_partref,
1278                 fid->udf.parent_generation);
1279}
1280static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1281             int connectable)
1282{
1283    int len = *lenp;
1284    struct inode *inode = de->d_inode;
1285    struct kernel_lb_addr location = UDF_I(inode)->i_location;
1286    struct fid *fid = (struct fid *)fh;
1287    int type = FILEID_UDF_WITHOUT_PARENT;
1288
1289    if (connectable && (len < 5)) {
1290        *lenp = 5;
1291        return 255;
1292    } else if (len < 3) {
1293        *lenp = 3;
1294        return 255;
1295    }
1296
1297    *lenp = 3;
1298    fid->udf.block = location.logicalBlockNum;
1299    fid->udf.partref = location.partitionReferenceNum;
1300    fid->udf.generation = inode->i_generation;
1301
1302    if (connectable && !S_ISDIR(inode->i_mode)) {
1303        spin_lock(&de->d_lock);
1304        inode = de->d_parent->d_inode;
1305        location = UDF_I(inode)->i_location;
1306        fid->udf.parent_block = location.logicalBlockNum;
1307        fid->udf.parent_partref = location.partitionReferenceNum;
1308        fid->udf.parent_generation = inode->i_generation;
1309        spin_unlock(&de->d_lock);
1310        *lenp = 5;
1311        type = FILEID_UDF_WITH_PARENT;
1312    }
1313
1314    return type;
1315}
1316
1317const struct export_operations udf_export_ops = {
1318    .encode_fh = udf_encode_fh,
1319    .fh_to_dentry = udf_fh_to_dentry,
1320    .fh_to_parent = udf_fh_to_parent,
1321    .get_parent = udf_get_parent,
1322};
1323
1324const struct inode_operations udf_dir_inode_operations = {
1325    .lookup = udf_lookup,
1326    .create = udf_create,
1327    .link = udf_link,
1328    .unlink = udf_unlink,
1329    .symlink = udf_symlink,
1330    .mkdir = udf_mkdir,
1331    .rmdir = udf_rmdir,
1332    .mknod = udf_mknod,
1333    .rename = udf_rename,
1334};
1335const struct inode_operations udf_symlink_inode_operations = {
1336    .readlink = generic_readlink,
1337    .follow_link = page_follow_link_light,
1338    .put_link = page_put_link,
1339};
1340

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