Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dir.c |
| 3 | * |
| 4 | * PURPOSE |
| 5 | * Directory handling routines for the OSTA-UDF(tm) filesystem. |
| 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/smp_lock.h> |
| 34 | #include <linux/buffer_head.h> |
| 35 | |
| 36 | #include "udf_i.h" |
| 37 | #include "udf_sb.h" |
| 38 | |
| 39 | /* Prototypes for file operations */ |
| 40 | static int udf_readdir(struct file *, void *, filldir_t); |
| 41 | static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *); |
| 42 | |
| 43 | /* readdir and lookup functions */ |
| 44 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 45 | const struct file_operations udf_dir_operations = { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 46 | .read = generic_read_dir, |
| 47 | .readdir = udf_readdir, |
| 48 | .ioctl = udf_ioctl, |
| 49 | .fsync = udf_fsync_file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
| 52 | /* |
| 53 | * udf_readdir |
| 54 | * |
| 55 | * PURPOSE |
| 56 | * Read a directory entry. |
| 57 | * |
| 58 | * DESCRIPTION |
| 59 | * Optional - sys_getdents() will return -ENOTDIR if this routine is not |
| 60 | * available. |
| 61 | * |
| 62 | * Refer to sys_getdents() in fs/readdir.c |
| 63 | * sys_getdents() -> . |
| 64 | * |
| 65 | * PRE-CONDITIONS |
| 66 | * filp Pointer to directory file. |
| 67 | * buf Pointer to directory entry buffer. |
| 68 | * filldir Pointer to filldir function. |
| 69 | * |
| 70 | * POST-CONDITIONS |
| 71 | * <return> >=0 on success. |
| 72 | * |
| 73 | * HISTORY |
| 74 | * July 1, 1997 - Andrew E. Mileski |
| 75 | * Written, tested, and released. |
| 76 | */ |
| 77 | |
| 78 | int udf_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 79 | { |
Josef Sipek | 5096e93 | 2006-12-08 02:37:44 -0800 | [diff] [blame] | 80 | struct inode *dir = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | int result; |
| 82 | |
| 83 | lock_kernel(); |
| 84 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 85 | if (filp->f_pos == 0) { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 86 | if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | unlock_kernel(); |
| 88 | return 0; |
| 89 | } |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 90 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | result = do_udf_readdir(dir, filp, filldir, dirent); |
| 94 | unlock_kernel(); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 95 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 98 | static int |
| 99 | do_udf_readdir(struct inode *dir, struct file *filp, filldir_t filldir, |
| 100 | void *dirent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
| 102 | struct udf_fileident_bh fibh; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 103 | struct fileIdentDesc *fi = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | struct fileIdentDesc cfi; |
| 105 | int block, iblock; |
| 106 | loff_t nf_pos = filp->f_pos - 1; |
| 107 | int flen; |
| 108 | char fname[UDF_NAME_LEN]; |
| 109 | char *nameptr; |
| 110 | uint16_t liu; |
| 111 | uint8_t lfi; |
| 112 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; |
Jan Kara | ff116fc | 2007-05-08 00:35:14 -0700 | [diff] [blame] | 113 | struct buffer_head *tmp, *bha[16]; |
| 114 | kernel_lb_addr eloc; |
| 115 | uint32_t elen; |
Jan Kara | 60448b1 | 2007-05-08 00:35:13 -0700 | [diff] [blame] | 116 | sector_t offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | int i, num; |
| 118 | unsigned int dt_type; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 119 | struct extent_position epos = { NULL, 0, {0, 0} }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | if (nf_pos >= size) |
| 122 | return 0; |
| 123 | |
| 124 | if (nf_pos == 0) |
| 125 | nf_pos = (udf_ext0_offset(dir) >> 2); |
| 126 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 127 | fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; |
Marcin Slusarz | c0b3443 | 2008-02-08 04:20:42 -0800 | [diff] [blame^] | 128 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | fibh.sbh = fibh.ebh = NULL; |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 130 | } else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2), |
| 131 | &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 133 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
Marcin Slusarz | c0b3443 | 2008-02-08 04:20:42 -0800 | [diff] [blame^] | 134 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
Jan Kara | ff116fc | 2007-05-08 00:35:14 -0700 | [diff] [blame] | 135 | epos.offset -= sizeof(short_ad); |
Marcin Slusarz | c0b3443 | 2008-02-08 04:20:42 -0800 | [diff] [blame^] | 136 | else if (UDF_I(dir)->i_alloc_type == |
| 137 | ICBTAG_FLAG_AD_LONG) |
Jan Kara | ff116fc | 2007-05-08 00:35:14 -0700 | [diff] [blame] | 138 | epos.offset -= sizeof(long_ad); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 139 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | offset = 0; |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 143 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) { |
Jan Kara | 3bf25cb | 2007-05-08 00:35:16 -0700 | [diff] [blame] | 144 | brelse(epos.bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | return -EIO; |
| 146 | } |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 147 | |
| 148 | if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | i = 16 >> (dir->i_sb->s_blocksize_bits - 9); |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 150 | if (i + offset > (elen >> dir->i_sb->s_blocksize_bits)) |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 151 | i = (elen >> dir->i_sb->s_blocksize_bits) - offset; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 152 | for (num = 0; i > 0; i--) { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 153 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | tmp = udf_tgetblk(dir->i_sb, block); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 155 | if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | bha[num++] = tmp; |
| 157 | else |
| 158 | brelse(tmp); |
| 159 | } |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 160 | if (num) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | ll_rw_block(READA, num, bha); |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 162 | for (i = 0; i < num; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | brelse(bha[i]); |
| 164 | } |
| 165 | } |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 166 | } else { |
Jan Kara | 3bf25cb | 2007-05-08 00:35:16 -0700 | [diff] [blame] | 167 | brelse(epos.bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return -ENOENT; |
| 169 | } |
| 170 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 171 | while (nf_pos < size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | filp->f_pos = nf_pos + 1; |
| 173 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 174 | fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, |
| 175 | &elen, &offset); |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 176 | if (!fi) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | if (fibh.sbh != fibh.ebh) |
Jan Kara | 3bf25cb | 2007-05-08 00:35:16 -0700 | [diff] [blame] | 178 | brelse(fibh.ebh); |
| 179 | brelse(fibh.sbh); |
| 180 | brelse(epos.bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | liu = le16_to_cpu(cfi.lengthOfImpUse); |
| 185 | lfi = cfi.lengthFileIdent; |
| 186 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 187 | if (fibh.sbh == fibh.ebh) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | nameptr = fi->fileIdent + liu; |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 189 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | int poffset; /* Unpaded ending offset */ |
| 191 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 192 | poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 194 | if (poffset >= lfi) { |
| 195 | nameptr = (char *)(fibh.ebh->b_data + poffset - lfi); |
| 196 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | nameptr = fname; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 198 | memcpy(nameptr, fi->fileIdent + liu, |
| 199 | lfi - poffset); |
| 200 | memcpy(nameptr + lfi - poffset, |
| 201 | fibh.ebh->b_data, poffset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
| 203 | } |
| 204 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 205 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
| 206 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | continue; |
| 208 | } |
| 209 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 210 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
| 211 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) |
| 212 | continue; |
| 213 | } |
| 214 | |
| 215 | if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) { |
Josef Sipek | 5096e93 | 2006-12-08 02:37:44 -0800 | [diff] [blame] | 216 | iblock = parent_ino(filp->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | flen = 2; |
| 218 | memcpy(fname, "..", flen); |
| 219 | dt_type = DT_DIR; |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 220 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation); |
| 222 | |
| 223 | iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0); |
| 224 | flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); |
| 225 | dt_type = DT_UNKNOWN; |
| 226 | } |
| 227 | |
Cyrill Gorcunov | cb00ea3 | 2007-07-19 01:47:43 -0700 | [diff] [blame] | 228 | if (flen) { |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 229 | if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | if (fibh.sbh != fibh.ebh) |
Jan Kara | 3bf25cb | 2007-05-08 00:35:16 -0700 | [diff] [blame] | 231 | brelse(fibh.ebh); |
| 232 | brelse(fibh.sbh); |
| 233 | brelse(epos.bh); |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 234 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | } |
Cyrill Gorcunov | 28de794 | 2007-07-21 04:37:18 -0700 | [diff] [blame] | 237 | } /* end while */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | filp->f_pos = nf_pos + 1; |
| 240 | |
| 241 | if (fibh.sbh != fibh.ebh) |
Jan Kara | 3bf25cb | 2007-05-08 00:35:16 -0700 | [diff] [blame] | 242 | brelse(fibh.ebh); |
| 243 | brelse(fibh.sbh); |
| 244 | brelse(epos.bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | return 0; |
| 247 | } |