5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
26 #include <linux/string.h>
27 #include <linux/errno.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>
35 enum { UDF_MAX_LINKS = 0xffff };
37 static inline int udf_match(int len1, const unsigned char *name1, int len2,
38 const unsigned char *name2)
43 return !memcmp(name1, name2, len1);
46 int 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)
50 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
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);
59 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
62 offset = fibh->soffset + sizeof(struct fileIdentDesc);
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);
70 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
71 memcpy(fibh->ebh->b_data, impuse - offset,
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);
84 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
86 memcpy(fibh->ebh->b_data, fileident - offset,
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);
98 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
99 memset(fibh->ebh->b_data, 0x00, padlen + offset);
102 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
103 sizeof(struct fileIdentDesc) - sizeof(struct tag));
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) +
113 crclen + sizeof(struct tag) -
114 sizeof(struct fileIdentDesc));
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);
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);
125 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
127 sizeof(struct fileIdentDesc));
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);
135 mark_inode_dirty(inode);
137 if (fibh->sbh != fibh->ebh)
138 mark_buffer_dirty_inode(fibh->ebh, inode);
139 mark_buffer_dirty_inode(fibh->sbh, inode);
144 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
145 const struct qstr *child,
146 struct udf_fileident_bh *fibh,
147 struct fileIdentDesc *cfi)
149 struct fileIdentDesc *fi = NULL;
152 unsigned char *fname = NULL;
153 unsigned char *nameptr;
157 struct kernel_lb_addr eloc;
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] == '.';
165 size = udf_ext0_offset(dir) + dir->i_size;
166 f_pos = udf_ext0_offset(dir);
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))
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);
183 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
188 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
192 while (f_pos < size) {
193 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
198 liu = le16_to_cpu(cfi->lengthOfImpUse);
199 lfi = cfi->lengthFileIdent;
201 if (fibh->sbh == fibh->ebh) {
202 nameptr = fi->fileIdent + liu;
204 int poffset; /* Unpaded ending offset */
206 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
210 nameptr = (uint8_t *)(fibh->ebh->b_data +
214 memcpy(nameptr, fi->fileIdent + liu,
216 memcpy(nameptr + lfi - poffset,
217 fibh->ebh->b_data, poffset);
221 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
222 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
226 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
227 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
231 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
238 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
239 if (flen && udf_match(flen, fname, child->len, child->name))
245 if (fibh->sbh != fibh->ebh)
255 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
256 struct nameidata *nd)
258 struct inode *inode = NULL;
259 struct fileIdentDesc cfi;
260 struct udf_fileident_bh fibh;
262 if (dentry->d_name.len > UDF_NAME_LEN - 2)
263 return ERR_PTR(-ENAMETOOLONG);
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,
274 inode = udf_iget(dir->i_sb, lb);
276 return ERR_PTR(-EACCES);
279 #endif /* UDF_RECOVERY */
281 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
282 struct kernel_lb_addr loc;
284 if (fibh.sbh != fibh.ebh)
288 loc = lelb_to_cpu(cfi.icb.extLocation);
289 inode = udf_iget(dir->i_sb, &loc);
291 return ERR_PTR(-EACCES);
295 return d_splice_alias(inode, dentry);
298 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
299 struct dentry *dentry,
300 struct udf_fileident_bh *fibh,
301 struct fileIdentDesc *cfi, int *err)
303 struct super_block *sb = dir->i_sb;
304 struct fileIdentDesc *fi = NULL;
305 unsigned char *name = NULL;
308 loff_t size = udf_ext0_offset(dir) + dir->i_size;
313 struct kernel_lb_addr eloc;
316 struct extent_position epos = {};
317 struct udf_inode_info *dinfo;
319 fibh->sbh = fibh->ebh = NULL;
320 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
327 if (!dentry->d_name.len) {
331 namelen = udf_put_filename(sb, dentry->d_name.name, name,
334 *err = -ENAMETOOLONG;
341 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
343 f_pos = udf_ext0_offset(dir);
345 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
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;
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);
364 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
370 block = dinfo->i_location.logicalBlockNum;
373 while (f_pos < size) {
374 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
382 liu = le16_to_cpu(cfi->lengthOfImpUse);
383 lfi = cfi->lengthFileIdent;
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,
407 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
408 sb->s_blocksize - fibh->eoffset < nfidlen) {
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)
417 fibh->sbh = fibh->ebh =
418 udf_expand_dir_adinicb(dir, &block, 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);
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) {
433 fibh->sbh = fibh->ebh;
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 +
441 udf_ext0_offset(dir) +
444 block = eloc.logicalBlockNum +
446 dir->i_sb->s_blocksize_bits);
447 fi = (struct fileIdentDesc *)
448 (fibh->sbh->b_data + fibh->soffset);
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);
461 fibh->soffset = fibh->eoffset - sb->s_blocksize;
462 fibh->eoffset += nfidlen - sb->s_blocksize;
463 if (fibh->sbh != fibh->ebh) {
465 fibh->sbh = fibh->ebh;
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);
474 /* Extents could have been merged, invalidate our position */
477 epos.block = dinfo->i_location;
478 epos.offset = udf_file_entry_alloc_offset(dir);
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))
485 block = eloc.logicalBlockNum + ((elen - 1) >>
486 dir->i_sb->s_blocksize_bits);
488 fibh->sbh = fibh->ebh;
489 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
491 fi = (struct fileIdentDesc *)
492 (fibh->sbh->b_data + sb->s_blocksize +
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,
502 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
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;
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))
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;
525 mark_inode_dirty(dir);
534 if (fibh->sbh != fibh->ebh)
543 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
544 struct udf_fileident_bh *fibh,
545 struct fileIdentDesc *cfi)
547 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
549 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
550 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
552 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
555 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
556 struct nameidata *nd)
558 struct udf_fileident_bh fibh;
560 struct fileIdentDesc cfi, *fi;
562 struct udf_inode_info *iinfo;
564 inode = udf_new_inode(dir, mode, &err);
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;
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);
578 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
580 inode_dec_link_count(inode);
584 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
585 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
586 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
587 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
588 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
589 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
590 mark_inode_dirty(dir);
591 if (fibh.sbh != fibh.ebh)
594 d_instantiate(dentry, inode);
599 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
603 struct udf_fileident_bh fibh;
604 struct fileIdentDesc cfi, *fi;
606 struct udf_inode_info *iinfo;
608 if (!old_valid_dev(rdev))
612 inode = udf_new_inode(dir, mode, &err);
616 iinfo = UDF_I(inode);
617 init_special_inode(inode, mode, rdev);
618 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
620 inode_dec_link_count(inode);
624 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
625 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
626 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
627 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
628 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
629 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
630 mark_inode_dirty(dir);
631 mark_inode_dirty(inode);
633 if (fibh.sbh != fibh.ebh)
636 d_instantiate(dentry, inode);
643 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
646 struct udf_fileident_bh fibh;
647 struct fileIdentDesc cfi, *fi;
649 struct udf_inode_info *dinfo = UDF_I(dir);
650 struct udf_inode_info *iinfo;
653 if (dir->i_nlink >= UDF_MAX_LINKS)
657 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
661 iinfo = UDF_I(inode);
662 inode->i_op = &udf_dir_inode_operations;
663 inode->i_fop = &udf_dir_operations;
664 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
666 inode_dec_link_count(inode);
671 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
672 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
673 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
674 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
675 cfi.fileCharacteristics =
676 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
677 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
679 mark_inode_dirty(inode);
681 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
684 mark_inode_dirty(inode);
688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
689 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
691 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
692 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
693 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
695 mark_inode_dirty(dir);
696 d_instantiate(dentry, inode);
697 if (fibh.sbh != fibh.ebh)
706 static int empty_dir(struct inode *dir)
708 struct fileIdentDesc *fi, cfi;
709 struct udf_fileident_bh fibh;
711 loff_t size = udf_ext0_offset(dir) + dir->i_size;
713 struct kernel_lb_addr eloc;
716 struct extent_position epos = {};
717 struct udf_inode_info *dinfo = UDF_I(dir);
719 f_pos = udf_ext0_offset(dir);
720 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
722 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
723 fibh.sbh = fibh.ebh = NULL;
724 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
725 &epos, &eloc, &elen, &offset) ==
726 (EXT_RECORDED_ALLOCATED >> 30)) {
727 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
728 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
729 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
730 epos.offset -= sizeof(struct short_ad);
731 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
732 epos.offset -= sizeof(struct long_ad);
736 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
746 while (f_pos < size) {
747 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
750 if (fibh.sbh != fibh.ebh)
757 if (cfi.lengthFileIdent &&
758 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
759 if (fibh.sbh != fibh.ebh)
767 if (fibh.sbh != fibh.ebh)
775 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
778 struct inode *inode = dentry->d_inode;
779 struct udf_fileident_bh fibh;
780 struct fileIdentDesc *fi, cfi;
781 struct kernel_lb_addr tloc;
784 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
789 tloc = lelb_to_cpu(cfi.icb.extLocation);
790 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
793 if (!empty_dir(inode))
795 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
798 if (inode->i_nlink != 2)
799 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
803 inode_dec_link_count(dir);
804 inode->i_ctime = dir->i_ctime = dir->i_mtime =
805 current_fs_time(dir->i_sb);
806 mark_inode_dirty(dir);
809 if (fibh.sbh != fibh.ebh)
817 static int udf_unlink(struct inode *dir, struct dentry *dentry)
820 struct inode *inode = dentry->d_inode;
821 struct udf_fileident_bh fibh;
822 struct fileIdentDesc *fi;
823 struct fileIdentDesc cfi;
824 struct kernel_lb_addr tloc;
827 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
832 tloc = lelb_to_cpu(cfi.icb.extLocation);
833 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
836 if (!inode->i_nlink) {
837 udf_debug("Deleting nonexistent file (%lu), %d\n",
838 inode->i_ino, inode->i_nlink);
841 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
844 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
845 mark_inode_dirty(dir);
846 inode_dec_link_count(inode);
847 inode->i_ctime = dir->i_ctime;
851 if (fibh.sbh != fibh.ebh)
859 static int udf_symlink(struct inode *dir, struct dentry *dentry,
863 struct pathComponent *pc;
864 const char *compstart;
865 struct udf_fileident_bh fibh;
866 struct extent_position epos = {};
867 int eoffset, elen = 0;
868 struct fileIdentDesc *fi;
869 struct fileIdentDesc cfi;
873 unsigned char *name = NULL;
875 struct udf_inode_info *iinfo;
876 struct super_block *sb = dir->i_sb;
878 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
882 iinfo = UDF_I(inode);
883 down_write(&iinfo->i_data_sem);
884 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
890 inode->i_data.a_ops = &udf_symlink_aops;
891 inode->i_op = &udf_symlink_inode_operations;
893 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
894 struct kernel_lb_addr eloc;
897 block = udf_new_block(sb, inode,
898 iinfo->i_location.partitionReferenceNum,
899 iinfo->i_location.logicalBlockNum, &err);
902 epos.block = iinfo->i_location;
903 epos.offset = udf_file_entry_alloc_offset(inode);
905 eloc.logicalBlockNum = block;
906 eloc.partitionReferenceNum =
907 iinfo->i_location.partitionReferenceNum;
908 bsize = sb->s_blocksize;
909 iinfo->i_lenExtents = bsize;
910 udf_add_aext(inode, &epos, &eloc, bsize, 0);
913 block = udf_get_pblock(sb, block,
914 iinfo->i_location.partitionReferenceNum,
916 epos.bh = udf_tgetblk(sb, block);
917 lock_buffer(epos.bh);
918 memset(epos.bh->b_data, 0x00, bsize);
919 set_buffer_uptodate(epos.bh);
920 unlock_buffer(epos.bh);
921 mark_buffer_dirty_inode(epos.bh, inode);
922 ea = epos.bh->b_data + udf_ext0_offset(inode);
924 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
926 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
927 pc = (struct pathComponent *)ea;
929 if (*symname == '/') {
932 } while (*symname == '/');
934 pc->componentType = 1;
935 pc->lengthComponentIdent = 0;
936 pc->componentFileVersionNum = 0;
937 elen += sizeof(struct pathComponent);
943 if (elen + sizeof(struct pathComponent) > eoffset)
946 pc = (struct pathComponent *)(ea + elen);
952 } while (*symname && *symname != '/');
954 pc->componentType = 5;
955 pc->lengthComponentIdent = 0;
956 pc->componentFileVersionNum = 0;
957 if (compstart[0] == '.') {
958 if ((symname - compstart) == 1)
959 pc->componentType = 4;
960 else if ((symname - compstart) == 2 &&
962 pc->componentType = 3;
965 if (pc->componentType == 5) {
966 namelen = udf_put_filename(sb, compstart, name,
967 symname - compstart);
971 if (elen + sizeof(struct pathComponent) + namelen >
975 pc->lengthComponentIdent = namelen;
977 memcpy(pc->componentIdent, name, namelen);
980 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
985 } while (*symname == '/');
990 inode->i_size = elen;
991 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
992 iinfo->i_lenAlloc = inode->i_size;
994 udf_truncate_tail_extent(inode);
995 mark_inode_dirty(inode);
997 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1000 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1001 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1002 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1003 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1004 cpu_to_le32(lvid_get_unique_id(sb));
1006 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1007 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1008 mark_inode_dirty(dir);
1009 up_write(&iinfo->i_data_sem);
1010 if (fibh.sbh != fibh.ebh)
1013 d_instantiate(dentry, inode);
1021 up_write(&iinfo->i_data_sem);
1022 inode_dec_link_count(inode);
1027 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1028 struct dentry *dentry)
1030 struct inode *inode = old_dentry->d_inode;
1031 struct udf_fileident_bh fibh;
1032 struct fileIdentDesc cfi, *fi;
1035 if (inode->i_nlink >= UDF_MAX_LINKS)
1038 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1042 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1043 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1044 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1045 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1046 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1048 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1049 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1050 mark_inode_dirty(dir);
1052 if (fibh.sbh != fibh.ebh)
1056 inode->i_ctime = current_fs_time(inode->i_sb);
1057 mark_inode_dirty(inode);
1059 d_instantiate(dentry, inode);
1064 /* Anybody can rename anything with this: the permission checks are left to the
1065 * higher-level routines.
1067 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1068 struct inode *new_dir, struct dentry *new_dentry)
1070 struct inode *old_inode = old_dentry->d_inode;
1071 struct inode *new_inode = new_dentry->d_inode;
1072 struct udf_fileident_bh ofibh, nfibh;
1073 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1074 struct fileIdentDesc ocfi, ncfi;
1075 struct buffer_head *dir_bh = NULL;
1076 int retval = -ENOENT;
1077 struct kernel_lb_addr tloc;
1078 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1080 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1082 if (ofibh.sbh != ofibh.ebh)
1086 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1087 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1088 != old_inode->i_ino)
1091 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1094 if (nfibh.sbh != nfibh.ebh)
1100 if (S_ISDIR(old_inode->i_mode)) {
1101 int offset = udf_ext0_offset(old_inode);
1104 retval = -ENOTEMPTY;
1105 if (!empty_dir(new_inode))
1109 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1110 dir_fi = udf_get_fileident(
1111 old_iinfo->i_ext.i_data -
1113 sizeof(struct extendedFileEntry) :
1114 sizeof(struct fileEntry)),
1115 old_inode->i_sb->s_blocksize, &offset);
1117 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1120 dir_fi = udf_get_fileident(dir_bh->b_data,
1121 old_inode->i_sb->s_blocksize, &offset);
1125 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1126 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1131 if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
1135 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1142 * Like most other Unix systems, set the ctime for inodes on a
1145 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1146 mark_inode_dirty(old_inode);
1151 ncfi.fileVersionNum = ocfi.fileVersionNum;
1152 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1153 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1154 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1156 /* The old fid may have moved - find it again */
1157 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1158 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1161 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1162 inode_dec_link_count(new_inode);
1164 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1165 mark_inode_dirty(old_dir);
1168 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1169 udf_update_tag((char *)dir_fi,
1170 (sizeof(struct fileIdentDesc) +
1171 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1172 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1173 mark_inode_dirty(old_inode);
1175 mark_buffer_dirty_inode(dir_bh, old_inode);
1177 inode_dec_link_count(old_dir);
1179 inode_dec_link_count(new_inode);
1182 mark_inode_dirty(new_dir);
1187 if (ofibh.sbh != ofibh.ebh)
1197 if (nfibh.sbh != nfibh.ebh)
1205 static struct dentry *udf_get_parent(struct dentry *child)
1207 struct kernel_lb_addr tloc;
1208 struct inode *inode = NULL;
1209 struct qstr dotdot = {.name = "..", .len = 2};
1210 struct fileIdentDesc cfi;
1211 struct udf_fileident_bh fibh;
1213 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1216 if (fibh.sbh != fibh.ebh)
1220 tloc = lelb_to_cpu(cfi.icb.extLocation);
1221 inode = udf_iget(child->d_inode->i_sb, &tloc);
1225 return d_obtain_alias(inode);
1227 return ERR_PTR(-EACCES);
1231 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1232 u16 partref, __u32 generation)
1234 struct inode *inode;
1235 struct kernel_lb_addr loc;
1238 return ERR_PTR(-ESTALE);
1240 loc.logicalBlockNum = block;
1241 loc.partitionReferenceNum = partref;
1242 inode = udf_iget(sb, &loc);
1245 return ERR_PTR(-ENOMEM);
1247 if (generation && inode->i_generation != generation) {
1249 return ERR_PTR(-ESTALE);
1251 return d_obtain_alias(inode);
1254 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1255 struct fid *fid, int fh_len, int fh_type)
1257 if ((fh_len != 3 && fh_len != 5) ||
1258 (fh_type != FILEID_UDF_WITH_PARENT &&
1259 fh_type != FILEID_UDF_WITHOUT_PARENT))
1262 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1263 fid->udf.generation);
1266 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1267 struct fid *fid, int fh_len, int fh_type)
1269 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1272 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1273 fid->udf.parent_partref,
1274 fid->udf.parent_generation);
1276 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1280 struct inode *inode = de->d_inode;
1281 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1282 struct fid *fid = (struct fid *)fh;
1283 int type = FILEID_UDF_WITHOUT_PARENT;
1285 if (connectable && (len < 5)) {
1288 } else if (len < 3) {
1294 fid->udf.block = location.logicalBlockNum;
1295 fid->udf.partref = location.partitionReferenceNum;
1296 fid->udf.generation = inode->i_generation;
1298 if (connectable && !S_ISDIR(inode->i_mode)) {
1299 spin_lock(&de->d_lock);
1300 inode = de->d_parent->d_inode;
1301 location = UDF_I(inode)->i_location;
1302 fid->udf.parent_block = location.logicalBlockNum;
1303 fid->udf.parent_partref = location.partitionReferenceNum;
1304 fid->udf.parent_generation = inode->i_generation;
1305 spin_unlock(&de->d_lock);
1307 type = FILEID_UDF_WITH_PARENT;
1313 const struct export_operations udf_export_ops = {
1314 .encode_fh = udf_encode_fh,
1315 .fh_to_dentry = udf_fh_to_dentry,
1316 .fh_to_parent = udf_fh_to_parent,
1317 .get_parent = udf_get_parent,
1320 const struct inode_operations udf_dir_inode_operations = {
1321 .lookup = udf_lookup,
1322 .create = udf_create,
1324 .unlink = udf_unlink,
1325 .symlink = udf_symlink,
1329 .rename = udf_rename,
1331 const struct inode_operations udf_symlink_inode_operations = {
1332 .readlink = generic_readlink,
1333 .follow_link = page_follow_link_light,
1334 .put_link = page_put_link,