dir.c

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    1 /*
    2  * dir.c
    3  *
    4  * PURPOSE
    5  *  Directory handling routines for the OSTA-UDF(tm) filesystem.
    6  *
    7  * COPYRIGHT
    8  *      This file is distributed under the terms of the GNU General Public
    9  *      License (GPL). Copies of the GPL can be obtained from:
   10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
   11  *      Each contributing author retains all rights to their own work.
   12  *
   13  *  (C) 1998-2004 Ben Fennema
   14  *
   15  * HISTORY
   16  *
   17  *  10/05/98 dgb  Split directory operations into its own file
   18  *                Implemented directory reads via do_udf_readdir
   19  *  10/06/98      Made directory operations work!
   20  *  11/17/98      Rewrote directory to support ICBTAG_FLAG_AD_LONG
   21  *  11/25/98 blf  Rewrote directory handling (readdir+lookup) to support reading
   22  *                across blocks.
   23  *  12/12/98      Split out the lookup code to namei.c. bulk of directory
   24  *                code now in directory.c:udf_fileident_read.
   25  */
   26 
   27 #include "udfdecl.h"
   28 
   29 #include <linux/string.h>
   30 #include <linux/errno.h>
   31 #include <linux/mm.h>
   32 #include <linux/slab.h>
   33 #include <linux/buffer_head.h>
   34 
   35 #include "udf_i.h"
   36 #include "udf_sb.h"
   37 
   38 static int do_udf_readdir(struct inode *dir, struct file *filp,
   39                           filldir_t filldir, void *dirent)
   40 {
   41         struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
   42         struct fileIdentDesc *fi = NULL;
   43         struct fileIdentDesc cfi;
   44         int block, iblock;
   45         loff_t nf_pos = (filp->f_pos - 1) << 2;
   46         int flen;
   47         unsigned char *fname = NULL;
   48         unsigned char *nameptr;
   49         uint16_t liu;
   50         uint8_t lfi;
   51         loff_t size = udf_ext0_offset(dir) + dir->i_size;
   52         struct buffer_head *tmp, *bha[16];
   53         struct kernel_lb_addr eloc;
   54         uint32_t elen;
   55         sector_t offset;
   56         int i, num, ret = 0;
   57         unsigned int dt_type;
   58         struct extent_position epos = { NULL, 0, {0, 0} };
   59         struct udf_inode_info *iinfo;
   60 
   61         if (nf_pos >= size)
   62                 goto out;
   63 
   64         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
   65         if (!fname) {
   66                 ret = -ENOMEM;
   67                 goto out;
   68         }
   69 
   70         if (nf_pos == 0)
   71                 nf_pos = udf_ext0_offset(dir);
   72 
   73         fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
   74         iinfo = UDF_I(dir);
   75         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
   76                 if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
   77                     &epos, &eloc, &elen, &offset)
   78                     != (EXT_RECORDED_ALLOCATED >> 30)) {
   79                         ret = -ENOENT;
   80                         goto out;
   81                 }
   82                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
   83                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
   84                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
   85                                 epos.offset -= sizeof(struct short_ad);
   86                         else if (iinfo->i_alloc_type ==
   87                                         ICBTAG_FLAG_AD_LONG)
   88                                 epos.offset -= sizeof(struct long_ad);
   89                 } else {
   90                         offset = 0;
   91                 }
   92 
   93                 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
   94                         ret = -EIO;
   95                         goto out;
   96                 }
   97 
   98                 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
   99                         i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
  100                         if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
  101                                 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
  102                         for (num = 0; i > 0; i--) {
  103                                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
  104                                 tmp = udf_tgetblk(dir->i_sb, block);
  105                                 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
  106                                         bha[num++] = tmp;
  107                                 else
  108                                         brelse(tmp);
  109                         }
  110                         if (num) {
  111                                 ll_rw_block(READA, num, bha);
  112                                 for (i = 0; i < num; i++)
  113                                         brelse(bha[i]);
  114                         }
  115                 }
  116         }
  117 
  118         while (nf_pos < size) {
  119                 filp->f_pos = (nf_pos >> 2) + 1;
  120 
  121                 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
  122                                         &elen, &offset);
  123                 if (!fi)
  124                         goto out;
  125 
  126                 liu = le16_to_cpu(cfi.lengthOfImpUse);
  127                 lfi = cfi.lengthFileIdent;
  128 
  129                 if (fibh.sbh == fibh.ebh) {
  130                         nameptr = fi->fileIdent + liu;
  131                 } else {
  132                         int poffset;    /* Unpaded ending offset */
  133 
  134                         poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
  135 
  136                         if (poffset >= lfi) {
  137                                 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
  138                         } else {
  139                                 nameptr = fname;
  140                                 memcpy(nameptr, fi->fileIdent + liu,
  141                                        lfi - poffset);
  142                                 memcpy(nameptr + lfi - poffset,
  143                                        fibh.ebh->b_data, poffset);
  144                         }
  145                 }
  146 
  147                 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
  148                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
  149                                 continue;
  150                 }
  151 
  152                 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
  153                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
  154                                 continue;
  155                 }
  156 
  157                 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
  158                         iblock = parent_ino(filp->f_path.dentry);
  159                         flen = 2;
  160                         memcpy(fname, "..", flen);
  161                         dt_type = DT_DIR;
  162                 } else {
  163                         struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
  164 
  165                         iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
  166                         flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
  167                         dt_type = DT_UNKNOWN;
  168                 }
  169 
  170                 if (flen && filldir(dirent, fname, flen, filp->f_pos,
  171                                     iblock, dt_type) < 0)
  172                         goto out;
  173         } /* end while */
  174 
  175         filp->f_pos = (nf_pos >> 2) + 1;
  176 
  177 out:
  178         if (fibh.sbh != fibh.ebh)
  179                 brelse(fibh.ebh);
  180         brelse(fibh.sbh);
  181         brelse(epos.bh);
  182         kfree(fname);
  183 
  184         return ret;
  185 }
  186 
  187 static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
  188 {
  189         struct inode *dir = filp->f_path.dentry->d_inode;
  190         int result;
  191 
  192         if (filp->f_pos == 0) {
  193                 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
  194                         return 0;
  195                 }
  196                 filp->f_pos++;
  197         }
  198 
  199         result = do_udf_readdir(dir, filp, filldir, dirent);
  200         return result;
  201 }
  202 
  203 /* readdir and lookup functions */
  204 const struct file_operations udf_dir_operations = {
  205         .llseek                 = generic_file_llseek,
  206         .read                   = generic_read_dir,
  207         .readdir                = udf_readdir,
  208         .unlocked_ioctl         = udf_ioctl,
  209         .fsync                  = generic_file_fsync,
  210 };

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FreeBSD/Linux Kernel Cross Reference sys/fs/udf/dir.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/dir.c