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0001 /*
0002  * namei.c
0003  *
0004  * PURPOSE
0005  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
0006  *
0007  * COPYRIGHT
0008  *      This file is distributed under the terms of the GNU General Public
0009  *      License (GPL). Copies of the GPL can be obtained from:
0010  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
0011  *      Each contributing author retains all rights to their own work.
0012  *
0013  *  (C) 1998-2004 Ben Fennema
0014  *  (C) 1999-2000 Stelias Computing Inc
0015  *
0016  * HISTORY
0017  *
0018  *  12/12/98 blf  Created. Split out the lookup code from dir.c
0019  *  04/19/99 blf  link, mknod, symlink support
0020  */
0021 
0022 #include "udfdecl.h"
0023 
0024 #include "udf_i.h"
0025 #include "udf_sb.h"
0026 #include <linux/string.h>
0027 #include <linux/errno.h>
0028 #include <linux/mm.h>
0029 #include <linux/slab.h>
0030 #include <linux/sched.h>
0031 #include <linux/crc-itu-t.h>
0032 #include <linux/exportfs.h>
0033 #include <linux/iversion.h>
0034 
0035 static inline int udf_match(int len1, const unsigned char *name1, int len2,
0036                 const unsigned char *name2)
0037 {
0038     if (len1 != len2)
0039         return 0;
0040 
0041     return !memcmp(name1, name2, len1);
0042 }
0043 
0044 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
0045          struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
0046          uint8_t *impuse, uint8_t *fileident)
0047 {
0048     uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
0049     uint16_t crc;
0050     int offset;
0051     uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
0052     uint8_t lfi = cfi->lengthFileIdent;
0053     int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
0054         sizeof(struct fileIdentDesc);
0055     int adinicb = 0;
0056 
0057     if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
0058         adinicb = 1;
0059 
0060     offset = fibh->soffset + sizeof(struct fileIdentDesc);
0061 
0062     if (impuse) {
0063         if (adinicb || (offset + liu < 0)) {
0064             memcpy((uint8_t *)sfi->impUse, impuse, liu);
0065         } else if (offset >= 0) {
0066             memcpy(fibh->ebh->b_data + offset, impuse, liu);
0067         } else {
0068             memcpy((uint8_t *)sfi->impUse, impuse, -offset);
0069             memcpy(fibh->ebh->b_data, impuse - offset,
0070                 liu + offset);
0071         }
0072     }
0073 
0074     offset += liu;
0075 
0076     if (fileident) {
0077         if (adinicb || (offset + lfi < 0)) {
0078             memcpy(sfi->impUse + liu, fileident, lfi);
0079         } else if (offset >= 0) {
0080             memcpy(fibh->ebh->b_data + offset, fileident, lfi);
0081         } else {
0082             memcpy(sfi->impUse + liu, fileident, -offset);
0083             memcpy(fibh->ebh->b_data, fileident - offset,
0084                 lfi + offset);
0085         }
0086     }
0087 
0088     offset += lfi;
0089 
0090     if (adinicb || (offset + padlen < 0)) {
0091         memset(sfi->impUse + liu + lfi, 0x00, padlen);
0092     } else if (offset >= 0) {
0093         memset(fibh->ebh->b_data + offset, 0x00, padlen);
0094     } else {
0095         memset(sfi->impUse + liu + lfi, 0x00, -offset);
0096         memset(fibh->ebh->b_data, 0x00, padlen + offset);
0097     }
0098 
0099     crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
0100               sizeof(struct fileIdentDesc) - sizeof(struct tag));
0101 
0102     if (fibh->sbh == fibh->ebh) {
0103         crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
0104                   crclen + sizeof(struct tag) -
0105                   sizeof(struct fileIdentDesc));
0106     } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
0107         crc = crc_itu_t(crc, fibh->ebh->b_data +
0108                     sizeof(struct fileIdentDesc) +
0109                     fibh->soffset,
0110                   crclen + sizeof(struct tag) -
0111                     sizeof(struct fileIdentDesc));
0112     } else {
0113         crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
0114                   -fibh->soffset - sizeof(struct fileIdentDesc));
0115         crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
0116     }
0117 
0118     cfi->descTag.descCRC = cpu_to_le16(crc);
0119     cfi->descTag.descCRCLength = cpu_to_le16(crclen);
0120     cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
0121 
0122     if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
0123         memcpy((uint8_t *)sfi, (uint8_t *)cfi,
0124             sizeof(struct fileIdentDesc));
0125     } else {
0126         memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
0127         memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
0128                sizeof(struct fileIdentDesc) + fibh->soffset);
0129     }
0130 
0131     if (adinicb) {
0132         mark_inode_dirty(inode);
0133     } else {
0134         if (fibh->sbh != fibh->ebh)
0135             mark_buffer_dirty_inode(fibh->ebh, inode);
0136         mark_buffer_dirty_inode(fibh->sbh, inode);
0137     }
0138     inode_inc_iversion(inode);
0139 
0140     return 0;
0141 }
0142 
0143 /**
0144  * udf_find_entry - find entry in given directory.
0145  *
0146  * @dir:    directory inode to search in
0147  * @child:  qstr of the name
0148  * @fibh:   buffer head / inode with file identifier descriptor we found
0149  * @cfi:    found file identifier descriptor with given name
0150  *
0151  * This function searches in the directory @dir for a file name @child. When
0152  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
0153  * directories) containing the file identifier descriptor (FID). In that case
0154  * the function returns pointer to the FID in the buffer or inode - but note
0155  * that FID may be split among two buffers (blocks) so accessing it via that
0156  * pointer isn't easily possible. This pointer can be used only as an iterator
0157  * for other directory manipulation functions. For inspection of the FID @cfi
0158  * can be used - the found FID is copied there.
0159  *
0160  * Returns pointer to FID, NULL when nothing found, or error code.
0161  */
0162 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
0163                         const struct qstr *child,
0164                         struct udf_fileident_bh *fibh,
0165                         struct fileIdentDesc *cfi)
0166 {
0167     struct fileIdentDesc *fi = NULL;
0168     loff_t f_pos;
0169     udf_pblk_t block;
0170     int flen;
0171     unsigned char *fname = NULL, *copy_name = NULL;
0172     unsigned char *nameptr;
0173     uint8_t lfi;
0174     uint16_t liu;
0175     loff_t size;
0176     struct kernel_lb_addr eloc;
0177     uint32_t elen;
0178     sector_t offset;
0179     struct extent_position epos = {};
0180     struct udf_inode_info *dinfo = UDF_I(dir);
0181     int isdotdot = child->len == 2 &&
0182         child->name[0] == '.' && child->name[1] == '.';
0183     struct super_block *sb = dir->i_sb;
0184 
0185     size = udf_ext0_offset(dir) + dir->i_size;
0186     f_pos = udf_ext0_offset(dir);
0187 
0188     fibh->sbh = fibh->ebh = NULL;
0189     fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
0190     if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
0191         if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
0192             &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
0193             fi = ERR_PTR(-EIO);
0194             goto out_err;
0195         }
0196 
0197         block = udf_get_lb_pblock(sb, &eloc, offset);
0198         if ((++offset << sb->s_blocksize_bits) < elen) {
0199             if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
0200                 epos.offset -= sizeof(struct short_ad);
0201             else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
0202                 epos.offset -= sizeof(struct long_ad);
0203         } else
0204             offset = 0;
0205 
0206         fibh->sbh = fibh->ebh = udf_tread(sb, block);
0207         if (!fibh->sbh) {
0208             fi = ERR_PTR(-EIO);
0209             goto out_err;
0210         }
0211     }
0212 
0213     fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
0214     if (!fname) {
0215         fi = ERR_PTR(-ENOMEM);
0216         goto out_err;
0217     }
0218 
0219     while (f_pos < size) {
0220         fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
0221                     &elen, &offset);
0222         if (!fi) {
0223             fi = ERR_PTR(-EIO);
0224             goto out_err;
0225         }
0226 
0227         liu = le16_to_cpu(cfi->lengthOfImpUse);
0228         lfi = cfi->lengthFileIdent;
0229 
0230         if (fibh->sbh == fibh->ebh) {
0231             nameptr = udf_get_fi_ident(fi);
0232         } else {
0233             int poffset;    /* Unpaded ending offset */
0234 
0235             poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
0236                     liu + lfi;
0237 
0238             if (poffset >= lfi)
0239                 nameptr = (uint8_t *)(fibh->ebh->b_data +
0240                               poffset - lfi);
0241             else {
0242                 if (!copy_name) {
0243                     copy_name = kmalloc(UDF_NAME_LEN,
0244                                 GFP_NOFS);
0245                     if (!copy_name) {
0246                         fi = ERR_PTR(-ENOMEM);
0247                         goto out_err;
0248                     }
0249                 }
0250                 nameptr = copy_name;
0251                 memcpy(nameptr, udf_get_fi_ident(fi),
0252                     lfi - poffset);
0253                 memcpy(nameptr + lfi - poffset,
0254                     fibh->ebh->b_data, poffset);
0255             }
0256         }
0257 
0258         if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
0259             if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
0260                 continue;
0261         }
0262 
0263         if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
0264             if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
0265                 continue;
0266         }
0267 
0268         if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
0269             isdotdot)
0270             goto out_ok;
0271 
0272         if (!lfi)
0273             continue;
0274 
0275         flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
0276         if (flen < 0) {
0277             fi = ERR_PTR(flen);
0278             goto out_err;
0279         }
0280 
0281         if (udf_match(flen, fname, child->len, child->name))
0282             goto out_ok;
0283     }
0284 
0285     fi = NULL;
0286 out_err:
0287     if (fibh->sbh != fibh->ebh)
0288         brelse(fibh->ebh);
0289     brelse(fibh->sbh);
0290 out_ok:
0291     brelse(epos.bh);
0292     kfree(fname);
0293     kfree(copy_name);
0294 
0295     return fi;
0296 }
0297 
0298 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
0299                  unsigned int flags)
0300 {
0301     struct inode *inode = NULL;
0302     struct fileIdentDesc cfi;
0303     struct udf_fileident_bh fibh;
0304     struct fileIdentDesc *fi;
0305 
0306     if (dentry->d_name.len > UDF_NAME_LEN)
0307         return ERR_PTR(-ENAMETOOLONG);
0308 
0309     fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
0310     if (IS_ERR(fi))
0311         return ERR_CAST(fi);
0312 
0313     if (fi) {
0314         struct kernel_lb_addr loc;
0315 
0316         if (fibh.sbh != fibh.ebh)
0317             brelse(fibh.ebh);
0318         brelse(fibh.sbh);
0319 
0320         loc = lelb_to_cpu(cfi.icb.extLocation);
0321         inode = udf_iget(dir->i_sb, &loc);
0322         if (IS_ERR(inode))
0323             return ERR_CAST(inode);
0324     }
0325 
0326     return d_splice_alias(inode, dentry);
0327 }
0328 
0329 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
0330                        struct dentry *dentry,
0331                        struct udf_fileident_bh *fibh,
0332                        struct fileIdentDesc *cfi, int *err)
0333 {
0334     struct super_block *sb = dir->i_sb;
0335     struct fileIdentDesc *fi = NULL;
0336     unsigned char *name = NULL;
0337     int namelen;
0338     loff_t f_pos;
0339     loff_t size = udf_ext0_offset(dir) + dir->i_size;
0340     int nfidlen;
0341     udf_pblk_t block;
0342     struct kernel_lb_addr eloc;
0343     uint32_t elen = 0;
0344     sector_t offset;
0345     struct extent_position epos = {};
0346     struct udf_inode_info *dinfo;
0347 
0348     fibh->sbh = fibh->ebh = NULL;
0349     name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
0350     if (!name) {
0351         *err = -ENOMEM;
0352         goto out_err;
0353     }
0354 
0355     if (dentry) {
0356         if (!dentry->d_name.len) {
0357             *err = -EINVAL;
0358             goto out_err;
0359         }
0360         namelen = udf_put_filename(sb, dentry->d_name.name,
0361                        dentry->d_name.len,
0362                        name, UDF_NAME_LEN_CS0);
0363         if (!namelen) {
0364             *err = -ENAMETOOLONG;
0365             goto out_err;
0366         }
0367     } else {
0368         namelen = 0;
0369     }
0370 
0371     nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
0372 
0373     f_pos = udf_ext0_offset(dir);
0374 
0375     fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
0376     dinfo = UDF_I(dir);
0377     if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
0378         if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
0379             &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
0380             block = udf_get_lb_pblock(dir->i_sb,
0381                     &dinfo->i_location, 0);
0382             fibh->soffset = fibh->eoffset = sb->s_blocksize;
0383             goto add;
0384         }
0385         block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
0386         if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
0387             if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
0388                 epos.offset -= sizeof(struct short_ad);
0389             else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
0390                 epos.offset -= sizeof(struct long_ad);
0391         } else
0392             offset = 0;
0393 
0394         fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
0395         if (!fibh->sbh) {
0396             *err = -EIO;
0397             goto out_err;
0398         }
0399 
0400         block = dinfo->i_location.logicalBlockNum;
0401     }
0402 
0403     while (f_pos < size) {
0404         fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
0405                     &elen, &offset);
0406 
0407         if (!fi) {
0408             *err = -EIO;
0409             goto out_err;
0410         }
0411 
0412         if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
0413             if (udf_dir_entry_len(cfi) == nfidlen) {
0414                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
0415                 cfi->fileVersionNum = cpu_to_le16(1);
0416                 cfi->fileCharacteristics = 0;
0417                 cfi->lengthFileIdent = namelen;
0418                 cfi->lengthOfImpUse = cpu_to_le16(0);
0419                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
0420                           name))
0421                     goto out_ok;
0422                 else {
0423                     *err = -EIO;
0424                     goto out_err;
0425                 }
0426             }
0427         }
0428     }
0429 
0430 add:
0431     f_pos += nfidlen;
0432 
0433     if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
0434         sb->s_blocksize - fibh->eoffset < nfidlen) {
0435         brelse(epos.bh);
0436         epos.bh = NULL;
0437         fibh->soffset -= udf_ext0_offset(dir);
0438         fibh->eoffset -= udf_ext0_offset(dir);
0439         f_pos -= udf_ext0_offset(dir);
0440         if (fibh->sbh != fibh->ebh)
0441             brelse(fibh->ebh);
0442         brelse(fibh->sbh);
0443         fibh->sbh = fibh->ebh =
0444                 udf_expand_dir_adinicb(dir, &block, err);
0445         if (!fibh->sbh)
0446             goto out_err;
0447         epos.block = dinfo->i_location;
0448         epos.offset = udf_file_entry_alloc_offset(dir);
0449         /* Load extent udf_expand_dir_adinicb() has created */
0450         udf_current_aext(dir, &epos, &eloc, &elen, 1);
0451     }
0452 
0453     /* Entry fits into current block? */
0454     if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
0455         fibh->soffset = fibh->eoffset;
0456         fibh->eoffset += nfidlen;
0457         if (fibh->sbh != fibh->ebh) {
0458             brelse(fibh->sbh);
0459             fibh->sbh = fibh->ebh;
0460         }
0461 
0462         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
0463             block = dinfo->i_location.logicalBlockNum;
0464             fi = (struct fileIdentDesc *)
0465                     (dinfo->i_data + fibh->soffset -
0466                      udf_ext0_offset(dir) +
0467                      dinfo->i_lenEAttr);
0468         } else {
0469             block = eloc.logicalBlockNum +
0470                     ((elen - 1) >>
0471                         dir->i_sb->s_blocksize_bits);
0472             fi = (struct fileIdentDesc *)
0473                 (fibh->sbh->b_data + fibh->soffset);
0474         }
0475     } else {
0476         /* Round up last extent in the file */
0477         elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
0478         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
0479             epos.offset -= sizeof(struct short_ad);
0480         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
0481             epos.offset -= sizeof(struct long_ad);
0482         udf_write_aext(dir, &epos, &eloc, elen, 1);
0483         dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
0484                     - 1) & ~(sb->s_blocksize - 1);
0485 
0486         fibh->soffset = fibh->eoffset - sb->s_blocksize;
0487         fibh->eoffset += nfidlen - sb->s_blocksize;
0488         if (fibh->sbh != fibh->ebh) {
0489             brelse(fibh->sbh);
0490             fibh->sbh = fibh->ebh;
0491         }
0492 
0493         block = eloc.logicalBlockNum + ((elen - 1) >>
0494                         dir->i_sb->s_blocksize_bits);
0495         fibh->ebh = udf_bread(dir,
0496                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
0497         if (!fibh->ebh)
0498             goto out_err;
0499         /* Extents could have been merged, invalidate our position */
0500         brelse(epos.bh);
0501         epos.bh = NULL;
0502         epos.block = dinfo->i_location;
0503         epos.offset = udf_file_entry_alloc_offset(dir);
0504 
0505         if (!fibh->soffset) {
0506             /* Find the freshly allocated block */
0507             while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
0508                 (EXT_RECORDED_ALLOCATED >> 30))
0509                 ;
0510             block = eloc.logicalBlockNum + ((elen - 1) >>
0511                     dir->i_sb->s_blocksize_bits);
0512             brelse(fibh->sbh);
0513             fibh->sbh = fibh->ebh;
0514             fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
0515         } else {
0516             fi = (struct fileIdentDesc *)
0517                 (fibh->sbh->b_data + sb->s_blocksize +
0518                     fibh->soffset);
0519         }
0520     }
0521 
0522     memset(cfi, 0, sizeof(struct fileIdentDesc));
0523     if (UDF_SB(sb)->s_udfrev >= 0x0200)
0524         udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
0525                 sizeof(struct tag));
0526     else
0527         udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
0528                 sizeof(struct tag));
0529     cfi->fileVersionNum = cpu_to_le16(1);
0530     cfi->lengthFileIdent = namelen;
0531     cfi->lengthOfImpUse = cpu_to_le16(0);
0532     if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
0533         dir->i_size += nfidlen;
0534         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
0535             dinfo->i_lenAlloc += nfidlen;
0536         else {
0537             /* Find the last extent and truncate it to proper size */
0538             while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
0539                 (EXT_RECORDED_ALLOCATED >> 30))
0540                 ;
0541             elen -= dinfo->i_lenExtents - dir->i_size;
0542             if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
0543                 epos.offset -= sizeof(struct short_ad);
0544             else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
0545                 epos.offset -= sizeof(struct long_ad);
0546             udf_write_aext(dir, &epos, &eloc, elen, 1);
0547             dinfo->i_lenExtents = dir->i_size;
0548         }
0549 
0550         mark_inode_dirty(dir);
0551         goto out_ok;
0552     } else {
0553         *err = -EIO;
0554         goto out_err;
0555     }
0556 
0557 out_err:
0558     fi = NULL;
0559     if (fibh->sbh != fibh->ebh)
0560         brelse(fibh->ebh);
0561     brelse(fibh->sbh);
0562 out_ok:
0563     brelse(epos.bh);
0564     kfree(name);
0565     return fi;
0566 }
0567 
0568 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
0569                 struct udf_fileident_bh *fibh,
0570                 struct fileIdentDesc *cfi)
0571 {
0572     cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
0573 
0574     if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
0575         memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
0576 
0577     return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
0578 }
0579 
0580 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
0581 {
0582     struct udf_inode_info *iinfo = UDF_I(inode);
0583     struct inode *dir = d_inode(dentry->d_parent);
0584     struct udf_fileident_bh fibh;
0585     struct fileIdentDesc cfi, *fi;
0586     int err;
0587 
0588     fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
0589     if (unlikely(!fi)) {
0590         inode_dec_link_count(inode);
0591         discard_new_inode(inode);
0592         return err;
0593     }
0594     cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
0595     cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
0596     *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
0597         cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
0598     udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
0599     dir->i_ctime = dir->i_mtime = current_time(dir);
0600     mark_inode_dirty(dir);
0601     if (fibh.sbh != fibh.ebh)
0602         brelse(fibh.ebh);
0603     brelse(fibh.sbh);
0604     d_instantiate_new(dentry, inode);
0605 
0606     return 0;
0607 }
0608 
0609 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
0610               struct dentry *dentry, umode_t mode, bool excl)
0611 {
0612     struct inode *inode = udf_new_inode(dir, mode);
0613 
0614     if (IS_ERR(inode))
0615         return PTR_ERR(inode);
0616 
0617     if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
0618         inode->i_data.a_ops = &udf_adinicb_aops;
0619     else
0620         inode->i_data.a_ops = &udf_aops;
0621     inode->i_op = &udf_file_inode_operations;
0622     inode->i_fop = &udf_file_operations;
0623     mark_inode_dirty(inode);
0624 
0625     return udf_add_nondir(dentry, inode);
0626 }
0627 
0628 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
0629                struct dentry *dentry, umode_t mode)
0630 {
0631     struct inode *inode = udf_new_inode(dir, mode);
0632 
0633     if (IS_ERR(inode))
0634         return PTR_ERR(inode);
0635 
0636     if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
0637         inode->i_data.a_ops = &udf_adinicb_aops;
0638     else
0639         inode->i_data.a_ops = &udf_aops;
0640     inode->i_op = &udf_file_inode_operations;
0641     inode->i_fop = &udf_file_operations;
0642     mark_inode_dirty(inode);
0643     d_tmpfile(dentry, inode);
0644     unlock_new_inode(inode);
0645     return 0;
0646 }
0647 
0648 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
0649              struct dentry *dentry, umode_t mode, dev_t rdev)
0650 {
0651     struct inode *inode;
0652 
0653     if (!old_valid_dev(rdev))
0654         return -EINVAL;
0655 
0656     inode = udf_new_inode(dir, mode);
0657     if (IS_ERR(inode))
0658         return PTR_ERR(inode);
0659 
0660     init_special_inode(inode, mode, rdev);
0661     return udf_add_nondir(dentry, inode);
0662 }
0663 
0664 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
0665              struct dentry *dentry, umode_t mode)
0666 {
0667     struct inode *inode;
0668     struct udf_fileident_bh fibh;
0669     struct fileIdentDesc cfi, *fi;
0670     int err;
0671     struct udf_inode_info *dinfo = UDF_I(dir);
0672     struct udf_inode_info *iinfo;
0673 
0674     inode = udf_new_inode(dir, S_IFDIR | mode);
0675     if (IS_ERR(inode))
0676         return PTR_ERR(inode);
0677 
0678     iinfo = UDF_I(inode);
0679     inode->i_op = &udf_dir_inode_operations;
0680     inode->i_fop = &udf_dir_operations;
0681     fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
0682     if (!fi) {
0683         inode_dec_link_count(inode);
0684         discard_new_inode(inode);
0685         goto out;
0686     }
0687     set_nlink(inode, 2);
0688     cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
0689     cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
0690     *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
0691         cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
0692     cfi.fileCharacteristics =
0693             FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
0694     udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
0695     brelse(fibh.sbh);
0696     mark_inode_dirty(inode);
0697 
0698     fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
0699     if (!fi) {
0700         clear_nlink(inode);
0701         mark_inode_dirty(inode);
0702         discard_new_inode(inode);
0703         goto out;
0704     }
0705     cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
0706     cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
0707     *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
0708         cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
0709     cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
0710     udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
0711     inc_nlink(dir);
0712     dir->i_ctime = dir->i_mtime = current_time(dir);
0713     mark_inode_dirty(dir);
0714     d_instantiate_new(dentry, inode);
0715     if (fibh.sbh != fibh.ebh)
0716         brelse(fibh.ebh);
0717     brelse(fibh.sbh);
0718     err = 0;
0719 
0720 out:
0721     return err;
0722 }
0723 
0724 static int empty_dir(struct inode *dir)
0725 {
0726     struct fileIdentDesc *fi, cfi;
0727     struct udf_fileident_bh fibh;
0728     loff_t f_pos;
0729     loff_t size = udf_ext0_offset(dir) + dir->i_size;
0730     udf_pblk_t block;
0731     struct kernel_lb_addr eloc;
0732     uint32_t elen;
0733     sector_t offset;
0734     struct extent_position epos = {};
0735     struct udf_inode_info *dinfo = UDF_I(dir);
0736 
0737     f_pos = udf_ext0_offset(dir);
0738     fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
0739 
0740     if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
0741         fibh.sbh = fibh.ebh = NULL;
0742     else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
0743                   &epos, &eloc, &elen, &offset) ==
0744                     (EXT_RECORDED_ALLOCATED >> 30)) {
0745         block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
0746         if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
0747             if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
0748                 epos.offset -= sizeof(struct short_ad);
0749             else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
0750                 epos.offset -= sizeof(struct long_ad);
0751         } else
0752             offset = 0;
0753 
0754         fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
0755         if (!fibh.sbh) {
0756             brelse(epos.bh);
0757             return 0;
0758         }
0759     } else {
0760         brelse(epos.bh);
0761         return 0;
0762     }
0763 
0764     while (f_pos < size) {
0765         fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
0766                     &elen, &offset);
0767         if (!fi) {
0768             if (fibh.sbh != fibh.ebh)
0769                 brelse(fibh.ebh);
0770             brelse(fibh.sbh);
0771             brelse(epos.bh);
0772             return 0;
0773         }
0774 
0775         if (cfi.lengthFileIdent &&
0776             (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
0777             if (fibh.sbh != fibh.ebh)
0778                 brelse(fibh.ebh);
0779             brelse(fibh.sbh);
0780             brelse(epos.bh);
0781             return 0;
0782         }
0783     }
0784 
0785     if (fibh.sbh != fibh.ebh)
0786         brelse(fibh.ebh);
0787     brelse(fibh.sbh);
0788     brelse(epos.bh);
0789 
0790     return 1;
0791 }
0792 
0793 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
0794 {
0795     int retval;
0796     struct inode *inode = d_inode(dentry);
0797     struct udf_fileident_bh fibh;
0798     struct fileIdentDesc *fi, cfi;
0799     struct kernel_lb_addr tloc;
0800 
0801     retval = -ENOENT;
0802     fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
0803     if (IS_ERR_OR_NULL(fi)) {
0804         if (fi)
0805             retval = PTR_ERR(fi);
0806         goto out;
0807     }
0808 
0809     retval = -EIO;
0810     tloc = lelb_to_cpu(cfi.icb.extLocation);
0811     if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
0812         goto end_rmdir;
0813     retval = -ENOTEMPTY;
0814     if (!empty_dir(inode))
0815         goto end_rmdir;
0816     retval = udf_delete_entry(dir, fi, &fibh, &cfi);
0817     if (retval)
0818         goto end_rmdir;
0819     if (inode->i_nlink != 2)
0820         udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
0821              inode->i_nlink);
0822     clear_nlink(inode);
0823     inode->i_size = 0;
0824     inode_dec_link_count(dir);
0825     inode->i_ctime = dir->i_ctime = dir->i_mtime =
0826                         current_time(inode);
0827     mark_inode_dirty(dir);
0828 
0829 end_rmdir:
0830     if (fibh.sbh != fibh.ebh)
0831         brelse(fibh.ebh);
0832     brelse(fibh.sbh);
0833 
0834 out:
0835     return retval;
0836 }
0837 
0838 static int udf_unlink(struct inode *dir, struct dentry *dentry)
0839 {
0840     int retval;
0841     struct inode *inode = d_inode(dentry);
0842     struct udf_fileident_bh fibh;
0843     struct fileIdentDesc *fi;
0844     struct fileIdentDesc cfi;
0845     struct kernel_lb_addr tloc;
0846 
0847     retval = -ENOENT;
0848     fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
0849 
0850     if (IS_ERR_OR_NULL(fi)) {
0851         if (fi)
0852             retval = PTR_ERR(fi);
0853         goto out;
0854     }
0855 
0856     retval = -EIO;
0857     tloc = lelb_to_cpu(cfi.icb.extLocation);
0858     if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
0859         goto end_unlink;
0860 
0861     if (!inode->i_nlink) {
0862         udf_debug("Deleting nonexistent file (%lu), %u\n",
0863               inode->i_ino, inode->i_nlink);
0864         set_nlink(inode, 1);
0865     }
0866     retval = udf_delete_entry(dir, fi, &fibh, &cfi);
0867     if (retval)
0868         goto end_unlink;
0869     dir->i_ctime = dir->i_mtime = current_time(dir);
0870     mark_inode_dirty(dir);
0871     inode_dec_link_count(inode);
0872     inode->i_ctime = dir->i_ctime;
0873     retval = 0;
0874 
0875 end_unlink:
0876     if (fibh.sbh != fibh.ebh)
0877         brelse(fibh.ebh);
0878     brelse(fibh.sbh);
0879 
0880 out:
0881     return retval;
0882 }
0883 
0884 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir,
0885                struct dentry *dentry, const char *symname)
0886 {
0887     struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
0888     struct pathComponent *pc;
0889     const char *compstart;
0890     struct extent_position epos = {};
0891     int eoffset, elen = 0;
0892     uint8_t *ea;
0893     int err;
0894     udf_pblk_t block;
0895     unsigned char *name = NULL;
0896     int namelen;
0897     struct udf_inode_info *iinfo;
0898     struct super_block *sb = dir->i_sb;
0899 
0900     if (IS_ERR(inode))
0901         return PTR_ERR(inode);
0902 
0903     iinfo = UDF_I(inode);
0904     down_write(&iinfo->i_data_sem);
0905     name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
0906     if (!name) {
0907         err = -ENOMEM;
0908         goto out_no_entry;
0909     }
0910 
0911     inode->i_data.a_ops = &udf_symlink_aops;
0912     inode->i_op = &udf_symlink_inode_operations;
0913     inode_nohighmem(inode);
0914 
0915     if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
0916         struct kernel_lb_addr eloc;
0917         uint32_t bsize;
0918 
0919         block = udf_new_block(sb, inode,
0920                 iinfo->i_location.partitionReferenceNum,
0921                 iinfo->i_location.logicalBlockNum, &err);
0922         if (!block)
0923             goto out_no_entry;
0924         epos.block = iinfo->i_location;
0925         epos.offset = udf_file_entry_alloc_offset(inode);
0926         epos.bh = NULL;
0927         eloc.logicalBlockNum = block;
0928         eloc.partitionReferenceNum =
0929                 iinfo->i_location.partitionReferenceNum;
0930         bsize = sb->s_blocksize;
0931         iinfo->i_lenExtents = bsize;
0932         udf_add_aext(inode, &epos, &eloc, bsize, 0);
0933         brelse(epos.bh);
0934 
0935         block = udf_get_pblock(sb, block,
0936                 iinfo->i_location.partitionReferenceNum,
0937                 0);
0938         epos.bh = udf_tgetblk(sb, block);
0939         if (unlikely(!epos.bh)) {
0940             err = -ENOMEM;
0941             goto out_no_entry;
0942         }
0943         lock_buffer(epos.bh);
0944         memset(epos.bh->b_data, 0x00, bsize);
0945         set_buffer_uptodate(epos.bh);
0946         unlock_buffer(epos.bh);
0947         mark_buffer_dirty_inode(epos.bh, inode);
0948         ea = epos.bh->b_data + udf_ext0_offset(inode);
0949     } else
0950         ea = iinfo->i_data + iinfo->i_lenEAttr;
0951 
0952     eoffset = sb->s_blocksize - udf_ext0_offset(inode);
0953     pc = (struct pathComponent *)ea;
0954 
0955     if (*symname == '/') {
0956         do {
0957             symname++;
0958         } while (*symname == '/');
0959 
0960         pc->componentType = 1;
0961         pc->lengthComponentIdent = 0;
0962         pc->componentFileVersionNum = 0;
0963         elen += sizeof(struct pathComponent);
0964     }
0965 
0966     err = -ENAMETOOLONG;
0967 
0968     while (*symname) {
0969         if (elen + sizeof(struct pathComponent) > eoffset)
0970             goto out_no_entry;
0971 
0972         pc = (struct pathComponent *)(ea + elen);
0973 
0974         compstart = symname;
0975 
0976         do {
0977             symname++;
0978         } while (*symname && *symname != '/');
0979 
0980         pc->componentType = 5;
0981         pc->lengthComponentIdent = 0;
0982         pc->componentFileVersionNum = 0;
0983         if (compstart[0] == '.') {
0984             if ((symname - compstart) == 1)
0985                 pc->componentType = 4;
0986             else if ((symname - compstart) == 2 &&
0987                     compstart[1] == '.')
0988                 pc->componentType = 3;
0989         }
0990 
0991         if (pc->componentType == 5) {
0992             namelen = udf_put_filename(sb, compstart,
0993                            symname - compstart,
0994                            name, UDF_NAME_LEN_CS0);
0995             if (!namelen)
0996                 goto out_no_entry;
0997 
0998             if (elen + sizeof(struct pathComponent) + namelen >
0999                     eoffset)
1000                 goto out_no_entry;
1001             else
1002                 pc->lengthComponentIdent = namelen;
1003 
1004             memcpy(pc->componentIdent, name, namelen);
1005         }
1006 
1007         elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1008 
1009         if (*symname) {
1010             do {
1011                 symname++;
1012             } while (*symname == '/');
1013         }
1014     }
1015 
1016     brelse(epos.bh);
1017     inode->i_size = elen;
1018     if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1019         iinfo->i_lenAlloc = inode->i_size;
1020     else
1021         udf_truncate_tail_extent(inode);
1022     mark_inode_dirty(inode);
1023     up_write(&iinfo->i_data_sem);
1024 
1025     err = udf_add_nondir(dentry, inode);
1026 out:
1027     kfree(name);
1028     return err;
1029 
1030 out_no_entry:
1031     up_write(&iinfo->i_data_sem);
1032     inode_dec_link_count(inode);
1033     discard_new_inode(inode);
1034     goto out;
1035 }
1036 
1037 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1038             struct dentry *dentry)
1039 {
1040     struct inode *inode = d_inode(old_dentry);
1041     struct udf_fileident_bh fibh;
1042     struct fileIdentDesc cfi, *fi;
1043     int err;
1044 
1045     fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1046     if (!fi) {
1047         return err;
1048     }
1049     cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1050     cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1051     if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1052         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1053             cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1054     }
1055     udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1056     if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1057         mark_inode_dirty(dir);
1058 
1059     if (fibh.sbh != fibh.ebh)
1060         brelse(fibh.ebh);
1061     brelse(fibh.sbh);
1062     inc_nlink(inode);
1063     inode->i_ctime = current_time(inode);
1064     mark_inode_dirty(inode);
1065     dir->i_ctime = dir->i_mtime = current_time(dir);
1066     mark_inode_dirty(dir);
1067     ihold(inode);
1068     d_instantiate(dentry, inode);
1069 
1070     return 0;
1071 }
1072 
1073 /* Anybody can rename anything with this: the permission checks are left to the
1074  * higher-level routines.
1075  */
1076 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1077               struct dentry *old_dentry, struct inode *new_dir,
1078               struct dentry *new_dentry, unsigned int flags)
1079 {
1080     struct inode *old_inode = d_inode(old_dentry);
1081     struct inode *new_inode = d_inode(new_dentry);
1082     struct udf_fileident_bh ofibh, nfibh;
1083     struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1084     struct fileIdentDesc ocfi, ncfi;
1085     struct buffer_head *dir_bh = NULL;
1086     int retval = -ENOENT;
1087     struct kernel_lb_addr tloc;
1088     struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1089 
1090     if (flags & ~RENAME_NOREPLACE)
1091         return -EINVAL;
1092 
1093     ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1094     if (IS_ERR(ofi)) {
1095         retval = PTR_ERR(ofi);
1096         goto end_rename;
1097     }
1098 
1099     if (ofibh.sbh != ofibh.ebh)
1100         brelse(ofibh.ebh);
1101 
1102     brelse(ofibh.sbh);
1103     tloc = lelb_to_cpu(ocfi.icb.extLocation);
1104     if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1105         != old_inode->i_ino)
1106         goto end_rename;
1107 
1108     nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1109     if (IS_ERR(nfi)) {
1110         retval = PTR_ERR(nfi);
1111         goto end_rename;
1112     }
1113     if (nfi && !new_inode) {
1114         if (nfibh.sbh != nfibh.ebh)
1115             brelse(nfibh.ebh);
1116         brelse(nfibh.sbh);
1117         nfi = NULL;
1118     }
1119     if (S_ISDIR(old_inode->i_mode)) {
1120         int offset = udf_ext0_offset(old_inode);
1121 
1122         if (new_inode) {
1123             retval = -ENOTEMPTY;
1124             if (!empty_dir(new_inode))
1125                 goto end_rename;
1126         }
1127         retval = -EIO;
1128         if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1129             dir_fi = udf_get_fileident(
1130                     old_iinfo->i_data -
1131                       (old_iinfo->i_efe ?
1132                        sizeof(struct extendedFileEntry) :
1133                        sizeof(struct fileEntry)),
1134                     old_inode->i_sb->s_blocksize, &offset);
1135         } else {
1136             dir_bh = udf_bread(old_inode, 0, 0, &retval);
1137             if (!dir_bh)
1138                 goto end_rename;
1139             dir_fi = udf_get_fileident(dir_bh->b_data,
1140                     old_inode->i_sb->s_blocksize, &offset);
1141         }
1142         if (!dir_fi)
1143             goto end_rename;
1144         tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1145         if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1146                 old_dir->i_ino)
1147             goto end_rename;
1148     }
1149     if (!nfi) {
1150         nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1151                     &retval);
1152         if (!nfi)
1153             goto end_rename;
1154     }
1155 
1156     /*
1157      * Like most other Unix systems, set the ctime for inodes on a
1158      * rename.
1159      */
1160     old_inode->i_ctime = current_time(old_inode);
1161     mark_inode_dirty(old_inode);
1162 
1163     /*
1164      * ok, that's it
1165      */
1166     ncfi.fileVersionNum = ocfi.fileVersionNum;
1167     ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1168     memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1169     udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1170 
1171     /* The old fid may have moved - find it again */
1172     ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1173     udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1174 
1175     if (new_inode) {
1176         new_inode->i_ctime = current_time(new_inode);
1177         inode_dec_link_count(new_inode);
1178     }
1179     old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1180     new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1181     mark_inode_dirty(old_dir);
1182     mark_inode_dirty(new_dir);
1183 
1184     if (dir_fi) {
1185         dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1186         udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1187         if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1188             mark_inode_dirty(old_inode);
1189         else
1190             mark_buffer_dirty_inode(dir_bh, old_inode);
1191 
1192         inode_dec_link_count(old_dir);
1193         if (new_inode)
1194             inode_dec_link_count(new_inode);
1195         else {
1196             inc_nlink(new_dir);
1197             mark_inode_dirty(new_dir);
1198         }
1199     }
1200 
1201     if (ofi) {
1202         if (ofibh.sbh != ofibh.ebh)
1203             brelse(ofibh.ebh);
1204         brelse(ofibh.sbh);
1205     }
1206 
1207     retval = 0;
1208 
1209 end_rename:
1210     brelse(dir_bh);
1211     if (nfi) {
1212         if (nfibh.sbh != nfibh.ebh)
1213             brelse(nfibh.ebh);
1214         brelse(nfibh.sbh);
1215     }
1216 
1217     return retval;
1218 }
1219 
1220 static struct dentry *udf_get_parent(struct dentry *child)
1221 {
1222     struct kernel_lb_addr tloc;
1223     struct inode *inode = NULL;
1224     struct fileIdentDesc cfi;
1225     struct udf_fileident_bh fibh;
1226 
1227     if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi))
1228         return ERR_PTR(-EACCES);
1229 
1230     if (fibh.sbh != fibh.ebh)
1231         brelse(fibh.ebh);
1232     brelse(fibh.sbh);
1233 
1234     tloc = lelb_to_cpu(cfi.icb.extLocation);
1235     inode = udf_iget(child->d_sb, &tloc);
1236     if (IS_ERR(inode))
1237         return ERR_CAST(inode);
1238 
1239     return d_obtain_alias(inode);
1240 }
1241 
1242 
1243 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1244                     u16 partref, __u32 generation)
1245 {
1246     struct inode *inode;
1247     struct kernel_lb_addr loc;
1248 
1249     if (block == 0)
1250         return ERR_PTR(-ESTALE);
1251 
1252     loc.logicalBlockNum = block;
1253     loc.partitionReferenceNum = partref;
1254     inode = udf_iget(sb, &loc);
1255 
1256     if (IS_ERR(inode))
1257         return ERR_CAST(inode);
1258 
1259     if (generation && inode->i_generation != generation) {
1260         iput(inode);
1261         return ERR_PTR(-ESTALE);
1262     }
1263     return d_obtain_alias(inode);
1264 }
1265 
1266 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1267                        struct fid *fid, int fh_len, int fh_type)
1268 {
1269     if (fh_len < 3 ||
1270         (fh_type != FILEID_UDF_WITH_PARENT &&
1271          fh_type != FILEID_UDF_WITHOUT_PARENT))
1272         return NULL;
1273 
1274     return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1275             fid->udf.generation);
1276 }
1277 
1278 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1279                        struct fid *fid, int fh_len, int fh_type)
1280 {
1281     if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1282         return NULL;
1283 
1284     return udf_nfs_get_inode(sb, fid->udf.parent_block,
1285                  fid->udf.parent_partref,
1286                  fid->udf.parent_generation);
1287 }
1288 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1289              struct inode *parent)
1290 {
1291     int len = *lenp;
1292     struct kernel_lb_addr location = UDF_I(inode)->i_location;
1293     struct fid *fid = (struct fid *)fh;
1294     int type = FILEID_UDF_WITHOUT_PARENT;
1295 
1296     if (parent && (len < 5)) {
1297         *lenp = 5;
1298         return FILEID_INVALID;
1299     } else if (len < 3) {
1300         *lenp = 3;
1301         return FILEID_INVALID;
1302     }
1303 
1304     *lenp = 3;
1305     fid->udf.block = location.logicalBlockNum;
1306     fid->udf.partref = location.partitionReferenceNum;
1307     fid->udf.parent_partref = 0;
1308     fid->udf.generation = inode->i_generation;
1309 
1310     if (parent) {
1311         location = UDF_I(parent)->i_location;
1312         fid->udf.parent_block = location.logicalBlockNum;
1313         fid->udf.parent_partref = location.partitionReferenceNum;
1314         fid->udf.parent_generation = inode->i_generation;
1315         *lenp = 5;
1316         type = FILEID_UDF_WITH_PARENT;
1317     }
1318 
1319     return type;
1320 }
1321 
1322 const struct export_operations udf_export_ops = {
1323     .encode_fh  = udf_encode_fh,
1324     .fh_to_dentry   = udf_fh_to_dentry,
1325     .fh_to_parent   = udf_fh_to_parent,
1326     .get_parent     = udf_get_parent,
1327 };
1328 
1329 const struct inode_operations udf_dir_inode_operations = {
1330     .lookup             = udf_lookup,
1331     .create             = udf_create,
1332     .link               = udf_link,
1333     .unlink             = udf_unlink,
1334     .symlink            = udf_symlink,
1335     .mkdir              = udf_mkdir,
1336     .rmdir              = udf_rmdir,
1337     .mknod              = udf_mknod,
1338     .rename             = udf_rename,
1339     .tmpfile            = udf_tmpfile,
1340 };
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