1/* 2 * directory.c 3 * 4 * PURPOSE 5 * Directory related functions 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 14#include "udfdecl.h" 15#include "udf_i.h" 16 17#include <linux/fs.h> 18#include <linux/string.h> 19#include <linux/buffer_head.h> 20 21 22struct fileIdentDesc * 23udf_fileident_read(struct inode *dir, loff_t *nf_pos, 24 struct udf_fileident_bh *fibh, 25 struct fileIdentDesc *cfi, 26 struct extent_position *epos, 27 kernel_lb_addr *eloc, uint32_t *elen, 28 sector_t *offset) 29{ 30 struct fileIdentDesc *fi; 31 int i, num, block; 32 struct buffer_head * tmp, * bha[16]; 33 34 fibh->soffset = fibh->eoffset; 35 36 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) 37 { 38 fi = udf_get_fileident(UDF_I_DATA(dir) - 39 (UDF_I_EFE(dir) ? 40 sizeof(struct extendedFileEntry) : 41 sizeof(struct fileEntry)), 42 dir->i_sb->s_blocksize, &(fibh->eoffset)); 43 44 if (!fi) 45 return NULL; 46 47 *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); 48 49 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); 50 51 return fi; 52 } 53 54 if (fibh->eoffset == dir->i_sb->s_blocksize) 55 { 56 int lextoffset = epos->offset; 57 58 if (udf_next_aext(dir, epos, eloc, elen, 1) != 59 (EXT_RECORDED_ALLOCATED >> 30)) 60 return NULL; 61 62 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); 63 64 (*offset) ++; 65 66 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) 67 *offset = 0; 68 else 69 epos->offset = lextoffset; 70 71 brelse(fibh->sbh); 72 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) 73 return NULL; 74 fibh->soffset = fibh->eoffset = 0; 75 76 if (!(*offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1))) 77 { 78 i = 16 >> (dir->i_sb->s_blocksize_bits - 9); 79 if (i+*offset > (*elen >> dir->i_sb->s_blocksize_bits)) 80 i = (*elen >> dir->i_sb->s_blocksize_bits)-*offset; 81 for (num=0; i>0; i--) 82 { 83 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset+i); 84 tmp = udf_tgetblk(dir->i_sb, block); 85 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) 86 bha[num++] = tmp; 87 else 88 brelse(tmp); 89 } 90 if (num) 91 { 92 ll_rw_block(READA, num, bha); 93 for (i=0; i<num; i++) 94 brelse(bha[i]); 95 } 96 } 97 } 98 else if (fibh->sbh != fibh->ebh) 99 { 100 brelse(fibh->sbh); 101 fibh->sbh = fibh->ebh; 102 } 103 104 fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, 105 &(fibh->eoffset)); 106 107 if (!fi) 108 return NULL; 109 110 *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); 111 112 if (fibh->eoffset <= dir->i_sb->s_blocksize) 113 { 114 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); 115 } 116 else if (fibh->eoffset > dir->i_sb->s_blocksize) 117 { 118 int lextoffset = epos->offset; 119 120 if (udf_next_aext(dir, epos, eloc, elen, 1) != 121 (EXT_RECORDED_ALLOCATED >> 30)) 122 return NULL; 123 124 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); 125 126 (*offset) ++; 127 128 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) 129 *offset = 0; 130 else 131 epos->offset = lextoffset; 132 133 fibh->soffset -= dir->i_sb->s_blocksize; 134 fibh->eoffset -= dir->i_sb->s_blocksize; 135 136 if (!(fibh->ebh = udf_tread(dir->i_sb, block))) 137 return NULL; 138 139 if (sizeof(struct fileIdentDesc) > - fibh->soffset) 140 { 141 int fi_len; 142 143 memcpy((uint8_t *)cfi, (uint8_t *)fi, - fibh->soffset); 144 memcpy((uint8_t *)cfi - fibh->soffset, fibh->ebh->b_data, 145 sizeof(struct fileIdentDesc) + fibh->soffset); 146 147 fi_len = (sizeof(struct fileIdentDesc) + cfi->lengthFileIdent + 148 le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; 149 150 *nf_pos += ((fi_len - (fibh->eoffset - fibh->soffset)) >> 2); 151 fibh->eoffset = fibh->soffset + fi_len; 152 } 153 else 154 { 155 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); 156 } 157 } 158 return fi; 159} 160 161struct fileIdentDesc * 162udf_get_fileident(void * buffer, int bufsize, int * offset) 163{ 164 struct fileIdentDesc *fi; 165 int lengthThisIdent; 166 uint8_t * ptr; 167 int padlen; 168 169 if ( (!buffer) || (!offset) ) { 170 udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset); 171 return NULL; 172 } 173 174 ptr = buffer; 175 176 if ( (*offset > 0) && (*offset < bufsize) ) { 177 ptr += *offset; 178 } 179 fi=(struct fileIdentDesc *)ptr; 180 if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID) 181 { 182 udf_debug("0x%x != TAG_IDENT_FID\n", 183 le16_to_cpu(fi->descTag.tagIdent)); 184 udf_debug("offset: %u sizeof: %lu bufsize: %u\n", 185 *offset, (unsigned long)sizeof(struct fileIdentDesc), bufsize); 186 return NULL; 187 } 188 if ( (*offset + sizeof(struct fileIdentDesc)) > bufsize ) 189 { 190 lengthThisIdent = sizeof(struct fileIdentDesc); 191 } 192 else 193 lengthThisIdent = sizeof(struct fileIdentDesc) + 194 fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); 195 196 /* we need to figure padding, too! */ 197 padlen = lengthThisIdent % UDF_NAME_PAD; 198 if (padlen) 199 lengthThisIdent += (UDF_NAME_PAD - padlen); 200 *offset = *offset + lengthThisIdent; 201 202 return fi; 203} 204 205 206short_ad * 207udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, int inc) 208{ 209 short_ad *sa; 210 211 if ( (!ptr) || (!offset) ) 212 { 213 printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); 214 return NULL; 215 } 216 217 if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) ) 218 return NULL; 219 else if ((sa = (short_ad *)ptr)->extLength == 0) 220 return NULL; 221 222 if (inc) 223 *offset += sizeof(short_ad); 224 return sa; 225} 226 227long_ad * 228udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc) 229{ 230 long_ad *la; 231 232 if ( (!ptr) || (!offset) ) 233 { 234 printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); 235 return NULL; 236 } 237 238 if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) ) 239 return NULL; 240 else if ((la = (long_ad *)ptr)->extLength == 0) 241 return NULL; 242 243 if (inc) 244 *offset += sizeof(long_ad); 245 return la; 246} 247