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 static inline int udf_match(int len1, const unsigned char *name1, int len2,
36 const unsigned char *name2)
41 return !memcmp(name1, name2, len1);
44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46 uint8_t *impuse, uint8_t *fileident)
48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
51 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
52 uint8_t lfi = cfi->lengthFileIdent;
53 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
54 sizeof(struct fileIdentDesc);
57 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
60 offset = fibh->soffset + sizeof(struct fileIdentDesc);
63 if (adinicb || (offset + liu < 0)) {
64 memcpy((uint8_t *)sfi->impUse, impuse, liu);
65 } else if (offset >= 0) {
66 memcpy(fibh->ebh->b_data + offset, impuse, liu);
68 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
69 memcpy(fibh->ebh->b_data, impuse - offset,
77 if (adinicb || (offset + lfi < 0)) {
78 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
79 } else if (offset >= 0) {
80 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
82 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
84 memcpy(fibh->ebh->b_data, fileident - offset,
91 if (adinicb || (offset + padlen < 0)) {
92 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
93 } else if (offset >= 0) {
94 memset(fibh->ebh->b_data + offset, 0x00, padlen);
96 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
97 memset(fibh->ebh->b_data, 0x00, padlen + offset);
100 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
101 sizeof(struct fileIdentDesc) - sizeof(struct tag));
103 if (fibh->sbh == fibh->ebh) {
104 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
105 crclen + sizeof(struct tag) -
106 sizeof(struct fileIdentDesc));
107 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
108 crc = crc_itu_t(crc, fibh->ebh->b_data +
109 sizeof(struct fileIdentDesc) +
111 crclen + sizeof(struct tag) -
112 sizeof(struct fileIdentDesc));
114 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
115 -fibh->soffset - sizeof(struct fileIdentDesc));
116 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
119 cfi->descTag.descCRC = cpu_to_le16(crc);
120 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
121 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
123 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
125 sizeof(struct fileIdentDesc));
127 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
128 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
129 sizeof(struct fileIdentDesc) + fibh->soffset);
133 mark_inode_dirty(inode);
135 if (fibh->sbh != fibh->ebh)
136 mark_buffer_dirty_inode(fibh->ebh, inode);
137 mark_buffer_dirty_inode(fibh->sbh, inode);
142 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143 const struct qstr *child,
144 struct udf_fileident_bh *fibh,
145 struct fileIdentDesc *cfi)
147 struct fileIdentDesc *fi = NULL;
150 unsigned char *fname = NULL;
151 unsigned char *nameptr;
155 struct kernel_lb_addr eloc;
158 struct extent_position epos = {};
159 struct udf_inode_info *dinfo = UDF_I(dir);
160 int isdotdot = child->len == 2 &&
161 child->name[0] == '.' && child->name[1] == '.';
162 struct super_block *sb = dir->i_sb;
164 size = udf_ext0_offset(dir) + dir->i_size;
165 f_pos = udf_ext0_offset(dir);
167 fibh->sbh = fibh->ebh = NULL;
168 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
169 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
170 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
171 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
173 block = udf_get_lb_pblock(sb, &eloc, offset);
174 if ((++offset << sb->s_blocksize_bits) < elen) {
175 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
176 epos.offset -= sizeof(struct short_ad);
177 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
178 epos.offset -= sizeof(struct long_ad);
182 fibh->sbh = fibh->ebh = udf_tread(sb, block);
187 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
191 while (f_pos < size) {
192 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
197 liu = le16_to_cpu(cfi->lengthOfImpUse);
198 lfi = cfi->lengthFileIdent;
200 if (fibh->sbh == fibh->ebh) {
201 nameptr = fi->fileIdent + liu;
203 int poffset; /* Unpaded ending offset */
205 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
209 nameptr = (uint8_t *)(fibh->ebh->b_data +
213 memcpy(nameptr, fi->fileIdent + liu,
215 memcpy(nameptr + lfi - poffset,
216 fibh->ebh->b_data, poffset);
220 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
221 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
225 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
226 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
230 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
237 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
238 if (flen && udf_match(flen, fname, child->len, child->name))
244 if (fibh->sbh != fibh->ebh)
254 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
257 struct inode *inode = NULL;
258 struct fileIdentDesc cfi;
259 struct udf_fileident_bh fibh;
261 if (dentry->d_name.len > UDF_NAME_LEN - 2)
262 return ERR_PTR(-ENAMETOOLONG);
265 /* temporary shorthand for specifying files by inode number */
266 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
267 struct kernel_lb_addr lb = {
268 .logicalBlockNum = 0,
269 .partitionReferenceNum =
270 simple_strtoul(dentry->d_name.name + 3,
273 inode = udf_iget(dir->i_sb, lb);
277 #endif /* UDF_RECOVERY */
279 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
280 struct kernel_lb_addr loc;
282 if (fibh.sbh != fibh.ebh)
286 loc = lelb_to_cpu(cfi.icb.extLocation);
287 inode = udf_iget(dir->i_sb, &loc);
289 return ERR_CAST(inode);
292 return d_splice_alias(inode, dentry);
295 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
296 struct dentry *dentry,
297 struct udf_fileident_bh *fibh,
298 struct fileIdentDesc *cfi, int *err)
300 struct super_block *sb = dir->i_sb;
301 struct fileIdentDesc *fi = NULL;
302 unsigned char *name = NULL;
305 loff_t size = udf_ext0_offset(dir) + dir->i_size;
310 struct kernel_lb_addr eloc;
313 struct extent_position epos = {};
314 struct udf_inode_info *dinfo;
316 fibh->sbh = fibh->ebh = NULL;
317 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
324 if (!dentry->d_name.len) {
328 namelen = udf_put_filename(sb, dentry->d_name.name, name,
331 *err = -ENAMETOOLONG;
338 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
340 f_pos = udf_ext0_offset(dir);
342 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
344 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
345 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
346 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
347 block = udf_get_lb_pblock(dir->i_sb,
348 &dinfo->i_location, 0);
349 fibh->soffset = fibh->eoffset = sb->s_blocksize;
352 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
353 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
354 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
355 epos.offset -= sizeof(struct short_ad);
356 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
357 epos.offset -= sizeof(struct long_ad);
361 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
367 block = dinfo->i_location.logicalBlockNum;
370 while (f_pos < size) {
371 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
379 liu = le16_to_cpu(cfi->lengthOfImpUse);
380 lfi = cfi->lengthFileIdent;
382 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
383 if (((sizeof(struct fileIdentDesc) +
384 liu + lfi + 3) & ~3) == nfidlen) {
385 cfi->descTag.tagSerialNum = cpu_to_le16(1);
386 cfi->fileVersionNum = cpu_to_le16(1);
387 cfi->fileCharacteristics = 0;
388 cfi->lengthFileIdent = namelen;
389 cfi->lengthOfImpUse = cpu_to_le16(0);
390 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
404 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
405 sb->s_blocksize - fibh->eoffset < nfidlen) {
408 fibh->soffset -= udf_ext0_offset(dir);
409 fibh->eoffset -= udf_ext0_offset(dir);
410 f_pos -= udf_ext0_offset(dir);
411 if (fibh->sbh != fibh->ebh)
414 fibh->sbh = fibh->ebh =
415 udf_expand_dir_adinicb(dir, &block, err);
418 epos.block = dinfo->i_location;
419 epos.offset = udf_file_entry_alloc_offset(dir);
420 /* Load extent udf_expand_dir_adinicb() has created */
421 udf_current_aext(dir, &epos, &eloc, &elen, 1);
424 /* Entry fits into current block? */
425 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
426 fibh->soffset = fibh->eoffset;
427 fibh->eoffset += nfidlen;
428 if (fibh->sbh != fibh->ebh) {
430 fibh->sbh = fibh->ebh;
433 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
434 block = dinfo->i_location.logicalBlockNum;
435 fi = (struct fileIdentDesc *)
436 (dinfo->i_ext.i_data +
438 udf_ext0_offset(dir) +
441 block = eloc.logicalBlockNum +
443 dir->i_sb->s_blocksize_bits);
444 fi = (struct fileIdentDesc *)
445 (fibh->sbh->b_data + fibh->soffset);
448 /* Round up last extent in the file */
449 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
450 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
451 epos.offset -= sizeof(struct short_ad);
452 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
453 epos.offset -= sizeof(struct long_ad);
454 udf_write_aext(dir, &epos, &eloc, elen, 1);
455 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
456 - 1) & ~(sb->s_blocksize - 1);
458 fibh->soffset = fibh->eoffset - sb->s_blocksize;
459 fibh->eoffset += nfidlen - sb->s_blocksize;
460 if (fibh->sbh != fibh->ebh) {
462 fibh->sbh = fibh->ebh;
465 block = eloc.logicalBlockNum + ((elen - 1) >>
466 dir->i_sb->s_blocksize_bits);
467 fibh->ebh = udf_bread(dir,
468 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
471 /* Extents could have been merged, invalidate our position */
474 epos.block = dinfo->i_location;
475 epos.offset = udf_file_entry_alloc_offset(dir);
477 if (!fibh->soffset) {
478 /* Find the freshly allocated block */
479 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
480 (EXT_RECORDED_ALLOCATED >> 30))
482 block = eloc.logicalBlockNum + ((elen - 1) >>
483 dir->i_sb->s_blocksize_bits);
485 fibh->sbh = fibh->ebh;
486 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
488 fi = (struct fileIdentDesc *)
489 (fibh->sbh->b_data + sb->s_blocksize +
494 memset(cfi, 0, sizeof(struct fileIdentDesc));
495 if (UDF_SB(sb)->s_udfrev >= 0x0200)
496 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
499 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
501 cfi->fileVersionNum = cpu_to_le16(1);
502 cfi->lengthFileIdent = namelen;
503 cfi->lengthOfImpUse = cpu_to_le16(0);
504 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
505 dir->i_size += nfidlen;
506 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
507 dinfo->i_lenAlloc += nfidlen;
509 /* Find the last extent and truncate it to proper size */
510 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
511 (EXT_RECORDED_ALLOCATED >> 30))
513 elen -= dinfo->i_lenExtents - dir->i_size;
514 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
515 epos.offset -= sizeof(struct short_ad);
516 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
517 epos.offset -= sizeof(struct long_ad);
518 udf_write_aext(dir, &epos, &eloc, elen, 1);
519 dinfo->i_lenExtents = dir->i_size;
522 mark_inode_dirty(dir);
531 if (fibh->sbh != fibh->ebh)
540 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
541 struct udf_fileident_bh *fibh,
542 struct fileIdentDesc *cfi)
544 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
546 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
547 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
549 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
552 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
554 struct udf_inode_info *iinfo = UDF_I(inode);
555 struct inode *dir = dentry->d_parent->d_inode;
556 struct udf_fileident_bh fibh;
557 struct fileIdentDesc cfi, *fi;
560 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
562 inode_dec_link_count(inode);
563 unlock_new_inode(inode);
567 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
568 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
569 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
570 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
571 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
572 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
573 mark_inode_dirty(dir);
574 if (fibh.sbh != fibh.ebh)
577 unlock_new_inode(inode);
578 d_instantiate(dentry, inode);
583 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
586 struct inode *inode = udf_new_inode(dir, mode);
589 return PTR_ERR(inode);
591 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
592 inode->i_data.a_ops = &udf_adinicb_aops;
594 inode->i_data.a_ops = &udf_aops;
595 inode->i_op = &udf_file_inode_operations;
596 inode->i_fop = &udf_file_operations;
597 mark_inode_dirty(inode);
599 return udf_add_nondir(dentry, inode);
602 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
604 struct inode *inode = udf_new_inode(dir, mode);
607 return PTR_ERR(inode);
609 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
610 inode->i_data.a_ops = &udf_adinicb_aops;
612 inode->i_data.a_ops = &udf_aops;
613 inode->i_op = &udf_file_inode_operations;
614 inode->i_fop = &udf_file_operations;
615 mark_inode_dirty(inode);
616 d_tmpfile(dentry, inode);
617 unlock_new_inode(inode);
621 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
626 if (!old_valid_dev(rdev))
629 inode = udf_new_inode(dir, mode);
631 return PTR_ERR(inode);
633 init_special_inode(inode, mode, rdev);
634 return udf_add_nondir(dentry, inode);
637 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
640 struct udf_fileident_bh fibh;
641 struct fileIdentDesc cfi, *fi;
643 struct udf_inode_info *dinfo = UDF_I(dir);
644 struct udf_inode_info *iinfo;
646 inode = udf_new_inode(dir, S_IFDIR | mode);
648 return PTR_ERR(inode);
650 iinfo = UDF_I(inode);
651 inode->i_op = &udf_dir_inode_operations;
652 inode->i_fop = &udf_dir_operations;
653 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
655 inode_dec_link_count(inode);
656 unlock_new_inode(inode);
661 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
662 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
663 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
664 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
665 cfi.fileCharacteristics =
666 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
667 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
669 mark_inode_dirty(inode);
671 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
674 mark_inode_dirty(inode);
675 unlock_new_inode(inode);
679 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
680 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
681 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
682 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
683 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
684 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
686 mark_inode_dirty(dir);
687 unlock_new_inode(inode);
688 d_instantiate(dentry, inode);
689 if (fibh.sbh != fibh.ebh)
698 static int empty_dir(struct inode *dir)
700 struct fileIdentDesc *fi, cfi;
701 struct udf_fileident_bh fibh;
703 loff_t size = udf_ext0_offset(dir) + dir->i_size;
705 struct kernel_lb_addr eloc;
708 struct extent_position epos = {};
709 struct udf_inode_info *dinfo = UDF_I(dir);
711 f_pos = udf_ext0_offset(dir);
712 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
714 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
715 fibh.sbh = fibh.ebh = NULL;
716 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
717 &epos, &eloc, &elen, &offset) ==
718 (EXT_RECORDED_ALLOCATED >> 30)) {
719 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
720 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
721 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
722 epos.offset -= sizeof(struct short_ad);
723 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
724 epos.offset -= sizeof(struct long_ad);
728 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
738 while (f_pos < size) {
739 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
742 if (fibh.sbh != fibh.ebh)
749 if (cfi.lengthFileIdent &&
750 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
751 if (fibh.sbh != fibh.ebh)
759 if (fibh.sbh != fibh.ebh)
767 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
770 struct inode *inode = dentry->d_inode;
771 struct udf_fileident_bh fibh;
772 struct fileIdentDesc *fi, cfi;
773 struct kernel_lb_addr tloc;
776 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
781 tloc = lelb_to_cpu(cfi.icb.extLocation);
782 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
785 if (!empty_dir(inode))
787 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
790 if (inode->i_nlink != 2)
791 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
795 inode_dec_link_count(dir);
796 inode->i_ctime = dir->i_ctime = dir->i_mtime =
797 current_fs_time(dir->i_sb);
798 mark_inode_dirty(dir);
801 if (fibh.sbh != fibh.ebh)
809 static int udf_unlink(struct inode *dir, struct dentry *dentry)
812 struct inode *inode = dentry->d_inode;
813 struct udf_fileident_bh fibh;
814 struct fileIdentDesc *fi;
815 struct fileIdentDesc cfi;
816 struct kernel_lb_addr tloc;
819 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
824 tloc = lelb_to_cpu(cfi.icb.extLocation);
825 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
828 if (!inode->i_nlink) {
829 udf_debug("Deleting nonexistent file (%lu), %d\n",
830 inode->i_ino, inode->i_nlink);
833 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
836 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
837 mark_inode_dirty(dir);
838 inode_dec_link_count(inode);
839 inode->i_ctime = dir->i_ctime;
843 if (fibh.sbh != fibh.ebh)
851 static int udf_symlink(struct inode *dir, struct dentry *dentry,
854 struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
855 struct pathComponent *pc;
856 const char *compstart;
857 struct extent_position epos = {};
858 int eoffset, elen = 0;
862 unsigned char *name = NULL;
864 struct udf_inode_info *iinfo;
865 struct super_block *sb = dir->i_sb;
868 return PTR_ERR(inode);
870 iinfo = UDF_I(inode);
871 down_write(&iinfo->i_data_sem);
872 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
878 inode->i_data.a_ops = &udf_symlink_aops;
879 inode->i_op = &udf_symlink_inode_operations;
881 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
882 struct kernel_lb_addr eloc;
885 block = udf_new_block(sb, inode,
886 iinfo->i_location.partitionReferenceNum,
887 iinfo->i_location.logicalBlockNum, &err);
890 epos.block = iinfo->i_location;
891 epos.offset = udf_file_entry_alloc_offset(inode);
893 eloc.logicalBlockNum = block;
894 eloc.partitionReferenceNum =
895 iinfo->i_location.partitionReferenceNum;
896 bsize = sb->s_blocksize;
897 iinfo->i_lenExtents = bsize;
898 udf_add_aext(inode, &epos, &eloc, bsize, 0);
901 block = udf_get_pblock(sb, block,
902 iinfo->i_location.partitionReferenceNum,
904 epos.bh = udf_tgetblk(sb, block);
905 lock_buffer(epos.bh);
906 memset(epos.bh->b_data, 0x00, bsize);
907 set_buffer_uptodate(epos.bh);
908 unlock_buffer(epos.bh);
909 mark_buffer_dirty_inode(epos.bh, inode);
910 ea = epos.bh->b_data + udf_ext0_offset(inode);
912 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
914 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
915 pc = (struct pathComponent *)ea;
917 if (*symname == '/') {
920 } while (*symname == '/');
922 pc->componentType = 1;
923 pc->lengthComponentIdent = 0;
924 pc->componentFileVersionNum = 0;
925 elen += sizeof(struct pathComponent);
931 if (elen + sizeof(struct pathComponent) > eoffset)
934 pc = (struct pathComponent *)(ea + elen);
940 } while (*symname && *symname != '/');
942 pc->componentType = 5;
943 pc->lengthComponentIdent = 0;
944 pc->componentFileVersionNum = 0;
945 if (compstart[0] == '.') {
946 if ((symname - compstart) == 1)
947 pc->componentType = 4;
948 else if ((symname - compstart) == 2 &&
950 pc->componentType = 3;
953 if (pc->componentType == 5) {
954 namelen = udf_put_filename(sb, compstart, name,
955 symname - compstart);
959 if (elen + sizeof(struct pathComponent) + namelen >
963 pc->lengthComponentIdent = namelen;
965 memcpy(pc->componentIdent, name, namelen);
968 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
973 } while (*symname == '/');
978 inode->i_size = elen;
979 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
980 iinfo->i_lenAlloc = inode->i_size;
982 udf_truncate_tail_extent(inode);
983 mark_inode_dirty(inode);
984 up_write(&iinfo->i_data_sem);
986 err = udf_add_nondir(dentry, inode);
992 up_write(&iinfo->i_data_sem);
993 inode_dec_link_count(inode);
994 unlock_new_inode(inode);
999 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1000 struct dentry *dentry)
1002 struct inode *inode = old_dentry->d_inode;
1003 struct udf_fileident_bh fibh;
1004 struct fileIdentDesc cfi, *fi;
1007 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1011 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1012 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1013 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1014 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1015 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1017 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1018 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1019 mark_inode_dirty(dir);
1021 if (fibh.sbh != fibh.ebh)
1025 inode->i_ctime = current_fs_time(inode->i_sb);
1026 mark_inode_dirty(inode);
1028 d_instantiate(dentry, inode);
1033 /* Anybody can rename anything with this: the permission checks are left to the
1034 * higher-level routines.
1036 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1037 struct inode *new_dir, struct dentry *new_dentry)
1039 struct inode *old_inode = old_dentry->d_inode;
1040 struct inode *new_inode = new_dentry->d_inode;
1041 struct udf_fileident_bh ofibh, nfibh;
1042 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1043 struct fileIdentDesc ocfi, ncfi;
1044 struct buffer_head *dir_bh = NULL;
1045 int retval = -ENOENT;
1046 struct kernel_lb_addr tloc;
1047 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1049 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1051 if (ofibh.sbh != ofibh.ebh)
1055 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1056 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1057 != old_inode->i_ino)
1060 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1063 if (nfibh.sbh != nfibh.ebh)
1069 if (S_ISDIR(old_inode->i_mode)) {
1070 int offset = udf_ext0_offset(old_inode);
1073 retval = -ENOTEMPTY;
1074 if (!empty_dir(new_inode))
1078 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1079 dir_fi = udf_get_fileident(
1080 old_iinfo->i_ext.i_data -
1082 sizeof(struct extendedFileEntry) :
1083 sizeof(struct fileEntry)),
1084 old_inode->i_sb->s_blocksize, &offset);
1086 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1089 dir_fi = udf_get_fileident(dir_bh->b_data,
1090 old_inode->i_sb->s_blocksize, &offset);
1094 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1095 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1100 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1107 * Like most other Unix systems, set the ctime for inodes on a
1110 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1111 mark_inode_dirty(old_inode);
1116 ncfi.fileVersionNum = ocfi.fileVersionNum;
1117 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1118 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1119 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1121 /* The old fid may have moved - find it again */
1122 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1123 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1126 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1127 inode_dec_link_count(new_inode);
1129 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1130 mark_inode_dirty(old_dir);
1133 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1134 udf_update_tag((char *)dir_fi,
1135 (sizeof(struct fileIdentDesc) +
1136 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1137 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1138 mark_inode_dirty(old_inode);
1140 mark_buffer_dirty_inode(dir_bh, old_inode);
1142 inode_dec_link_count(old_dir);
1144 inode_dec_link_count(new_inode);
1147 mark_inode_dirty(new_dir);
1152 if (ofibh.sbh != ofibh.ebh)
1162 if (nfibh.sbh != nfibh.ebh)
1170 static struct dentry *udf_get_parent(struct dentry *child)
1172 struct kernel_lb_addr tloc;
1173 struct inode *inode = NULL;
1174 struct qstr dotdot = QSTR_INIT("..", 2);
1175 struct fileIdentDesc cfi;
1176 struct udf_fileident_bh fibh;
1178 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1179 return ERR_PTR(-EACCES);
1181 if (fibh.sbh != fibh.ebh)
1185 tloc = lelb_to_cpu(cfi.icb.extLocation);
1186 inode = udf_iget(child->d_inode->i_sb, &tloc);
1188 return ERR_CAST(inode);
1190 return d_obtain_alias(inode);
1194 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1195 u16 partref, __u32 generation)
1197 struct inode *inode;
1198 struct kernel_lb_addr loc;
1201 return ERR_PTR(-ESTALE);
1203 loc.logicalBlockNum = block;
1204 loc.partitionReferenceNum = partref;
1205 inode = udf_iget(sb, &loc);
1208 return ERR_CAST(inode);
1210 if (generation && inode->i_generation != generation) {
1212 return ERR_PTR(-ESTALE);
1214 return d_obtain_alias(inode);
1217 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1218 struct fid *fid, int fh_len, int fh_type)
1220 if ((fh_len != 3 && fh_len != 5) ||
1221 (fh_type != FILEID_UDF_WITH_PARENT &&
1222 fh_type != FILEID_UDF_WITHOUT_PARENT))
1225 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1226 fid->udf.generation);
1229 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1230 struct fid *fid, int fh_len, int fh_type)
1232 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1235 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1236 fid->udf.parent_partref,
1237 fid->udf.parent_generation);
1239 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1240 struct inode *parent)
1243 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1244 struct fid *fid = (struct fid *)fh;
1245 int type = FILEID_UDF_WITHOUT_PARENT;
1247 if (parent && (len < 5)) {
1249 return FILEID_INVALID;
1250 } else if (len < 3) {
1252 return FILEID_INVALID;
1256 fid->udf.block = location.logicalBlockNum;
1257 fid->udf.partref = location.partitionReferenceNum;
1258 fid->udf.parent_partref = 0;
1259 fid->udf.generation = inode->i_generation;
1262 location = UDF_I(parent)->i_location;
1263 fid->udf.parent_block = location.logicalBlockNum;
1264 fid->udf.parent_partref = location.partitionReferenceNum;
1265 fid->udf.parent_generation = inode->i_generation;
1267 type = FILEID_UDF_WITH_PARENT;
1273 const struct export_operations udf_export_ops = {
1274 .encode_fh = udf_encode_fh,
1275 .fh_to_dentry = udf_fh_to_dentry,
1276 .fh_to_parent = udf_fh_to_parent,
1277 .get_parent = udf_get_parent,
1280 const struct inode_operations udf_dir_inode_operations = {
1281 .lookup = udf_lookup,
1282 .create = udf_create,
1284 .unlink = udf_unlink,
1285 .symlink = udf_symlink,
1289 .rename = udf_rename,
1290 .tmpfile = udf_tmpfile,
1292 const struct inode_operations udf_symlink_inode_operations = {
1293 .readlink = generic_readlink,
1294 .follow_link = page_follow_link_light,
1295 .put_link = page_put_link,