Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 1 | /* |
| 2 | * image.c --- writes out the critical parts of the filesystem as a |
| 3 | * flat file. |
| 4 | * |
| 5 | * Copyright (C) 2000 Theodore Ts'o. |
| 6 | * |
| 7 | * Note: this uses the POSIX IO interfaces, unlike most of the other |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 8 | * functions in this library. So sue me. |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 9 | * |
| 10 | * %Begin-Header% |
Theodore Ts'o | 543547a | 2010-05-17 21:31:56 -0400 | [diff] [blame] | 11 | * This file may be redistributed under the terms of the GNU Library |
| 12 | * General Public License, version 2. |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 13 | * %End-Header% |
| 14 | */ |
| 15 | |
Theodore Ts'o | d1154eb | 2011-09-18 17:34:37 -0400 | [diff] [blame] | 16 | #include "config.h" |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 17 | #include <stdio.h> |
| 18 | #include <string.h> |
| 19 | #if HAVE_UNISTD_H |
| 20 | #include <unistd.h> |
| 21 | #endif |
| 22 | #if HAVE_ERRNO_H |
| 23 | #include <errno.h> |
| 24 | #endif |
| 25 | #include <fcntl.h> |
| 26 | #include <time.h> |
| 27 | #if HAVE_SYS_STAT_H |
| 28 | #include <sys/stat.h> |
| 29 | #endif |
| 30 | #if HAVE_SYS_TYPES_H |
| 31 | #include <sys/types.h> |
| 32 | #endif |
| 33 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 34 | #include "ext2_fs.h" |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 35 | #include "ext2fs.h" |
| 36 | |
Theodore Ts'o | fff4548 | 2003-04-13 00:44:19 -0400 | [diff] [blame] | 37 | #ifndef HAVE_TYPE_SSIZE_T |
| 38 | typedef int ssize_t; |
| 39 | #endif |
| 40 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 41 | /* |
| 42 | * This function returns 1 if the specified block is all zeros |
| 43 | */ |
| 44 | static int check_zero_block(char *buf, int blocksize) |
| 45 | { |
| 46 | char *cp = buf; |
| 47 | int left = blocksize; |
| 48 | |
| 49 | while (left > 0) { |
| 50 | if (*cp++) |
| 51 | return 0; |
| 52 | left--; |
| 53 | } |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Write the inode table out as a single block. |
| 59 | */ |
| 60 | #define BUF_BLOCKS 32 |
| 61 | |
| 62 | errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags) |
| 63 | { |
| 64 | unsigned int group, left, c, d; |
| 65 | char *buf, *cp; |
Valerie Aurora Henson | 6d8b37f | 2010-06-13 11:00:00 -0400 | [diff] [blame] | 66 | blk64_t blk; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 67 | ssize_t actual; |
| 68 | errcode_t retval; |
| 69 | |
| 70 | buf = malloc(fs->blocksize * BUF_BLOCKS); |
| 71 | if (!buf) |
| 72 | return ENOMEM; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 73 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 74 | for (group = 0; group < fs->group_desc_count; group++) { |
Valerie Aurora Henson | d7cca6b | 2009-10-25 21:43:47 -0400 | [diff] [blame] | 75 | blk = ext2fs_inode_table_loc(fs, (unsigned)group); |
Brian Behlendorf | f93625b | 2007-03-21 17:43:37 -0400 | [diff] [blame] | 76 | if (!blk) { |
| 77 | retval = EXT2_ET_MISSING_INODE_TABLE; |
| 78 | goto errout; |
| 79 | } |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 80 | left = fs->inode_blocks_per_group; |
| 81 | while (left) { |
| 82 | c = BUF_BLOCKS; |
| 83 | if (c > left) |
| 84 | c = left; |
Valerie Aurora Henson | 24a117a | 2009-09-07 21:14:24 -0400 | [diff] [blame] | 85 | retval = io_channel_read_blk64(fs->io, blk, c, buf); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 86 | if (retval) |
| 87 | goto errout; |
| 88 | cp = buf; |
| 89 | while (c) { |
| 90 | if (!(flags & IMAGER_FLAG_SPARSEWRITE)) { |
| 91 | d = c; |
| 92 | goto skip_sparse; |
| 93 | } |
| 94 | /* Skip zero blocks */ |
| 95 | if (check_zero_block(cp, fs->blocksize)) { |
| 96 | c--; |
| 97 | blk++; |
| 98 | left--; |
| 99 | cp += fs->blocksize; |
| 100 | lseek(fd, fs->blocksize, SEEK_CUR); |
| 101 | continue; |
| 102 | } |
| 103 | /* Find non-zero blocks */ |
| 104 | for (d=1; d < c; d++) { |
| 105 | if (check_zero_block(cp + d*fs->blocksize, fs->blocksize)) |
| 106 | break; |
| 107 | } |
| 108 | skip_sparse: |
| 109 | actual = write(fd, cp, fs->blocksize * d); |
| 110 | if (actual == -1) { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 111 | retval = errno; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 112 | goto errout; |
| 113 | } |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 114 | if (actual != (ssize_t) (fs->blocksize * d)) { |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 115 | retval = EXT2_ET_SHORT_WRITE; |
| 116 | goto errout; |
| 117 | } |
| 118 | blk += d; |
| 119 | left -= d; |
| 120 | cp += fs->blocksize * d; |
| 121 | c -= d; |
| 122 | } |
| 123 | } |
| 124 | } |
| 125 | retval = 0; |
| 126 | |
| 127 | errout: |
| 128 | free(buf); |
| 129 | return retval; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Read in the inode table and stuff it into place |
| 134 | */ |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 135 | errcode_t ext2fs_image_inode_read(ext2_filsys fs, int fd, |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 136 | int flags EXT2FS_ATTR((unused))) |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 137 | { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 138 | unsigned int group, c, left; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 139 | char *buf; |
Valerie Aurora Henson | 6d8b37f | 2010-06-13 11:00:00 -0400 | [diff] [blame] | 140 | blk64_t blk; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 141 | ssize_t actual; |
| 142 | errcode_t retval; |
| 143 | |
| 144 | buf = malloc(fs->blocksize * BUF_BLOCKS); |
| 145 | if (!buf) |
| 146 | return ENOMEM; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 147 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 148 | for (group = 0; group < fs->group_desc_count; group++) { |
Valerie Aurora Henson | d7cca6b | 2009-10-25 21:43:47 -0400 | [diff] [blame] | 149 | blk = ext2fs_inode_table_loc(fs, (unsigned)group); |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 150 | if (!blk) { |
| 151 | retval = EXT2_ET_MISSING_INODE_TABLE; |
| 152 | goto errout; |
| 153 | } |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 154 | left = fs->inode_blocks_per_group; |
| 155 | while (left) { |
| 156 | c = BUF_BLOCKS; |
| 157 | if (c > left) |
| 158 | c = left; |
| 159 | actual = read(fd, buf, fs->blocksize * c); |
| 160 | if (actual == -1) { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 161 | retval = errno; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 162 | goto errout; |
| 163 | } |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 164 | if (actual != (ssize_t) (fs->blocksize * c)) { |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 165 | retval = EXT2_ET_SHORT_READ; |
| 166 | goto errout; |
| 167 | } |
Valerie Aurora Henson | 24a117a | 2009-09-07 21:14:24 -0400 | [diff] [blame] | 168 | retval = io_channel_write_blk64(fs->io, blk, c, buf); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 169 | if (retval) |
| 170 | goto errout; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 171 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 172 | blk += c; |
| 173 | left -= c; |
| 174 | } |
| 175 | } |
| 176 | retval = ext2fs_flush_icache(fs); |
| 177 | |
| 178 | errout: |
| 179 | free(buf); |
| 180 | return retval; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Write out superblock and group descriptors |
| 185 | */ |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 186 | errcode_t ext2fs_image_super_write(ext2_filsys fs, int fd, |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 187 | int flags EXT2FS_ATTR((unused))) |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 188 | { |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 189 | char *buf, *cp; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 190 | ssize_t actual; |
| 191 | errcode_t retval; |
| 192 | |
| 193 | buf = malloc(fs->blocksize); |
| 194 | if (!buf) |
| 195 | return ENOMEM; |
| 196 | |
| 197 | /* |
| 198 | * Write out the superblock |
| 199 | */ |
| 200 | memset(buf, 0, fs->blocksize); |
| 201 | memcpy(buf, fs->super, SUPERBLOCK_SIZE); |
| 202 | actual = write(fd, buf, fs->blocksize); |
| 203 | if (actual == -1) { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 204 | retval = errno; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 205 | goto errout; |
| 206 | } |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 207 | if (actual != (ssize_t) fs->blocksize) { |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 208 | retval = EXT2_ET_SHORT_WRITE; |
| 209 | goto errout; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Now write out the block group descriptors |
| 214 | */ |
| 215 | cp = (char *) fs->group_desc; |
| 216 | actual = write(fd, cp, fs->blocksize * fs->desc_blocks); |
| 217 | if (actual == -1) { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 218 | retval = errno; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 219 | goto errout; |
| 220 | } |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 221 | if (actual != (ssize_t) (fs->blocksize * fs->desc_blocks)) { |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 222 | retval = EXT2_ET_SHORT_WRITE; |
| 223 | goto errout; |
| 224 | } |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 225 | |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 226 | retval = 0; |
| 227 | |
| 228 | errout: |
| 229 | free(buf); |
| 230 | return retval; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Read the superblock and group descriptors and overwrite them. |
| 235 | */ |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 236 | errcode_t ext2fs_image_super_read(ext2_filsys fs, int fd, |
Theodore Ts'o | 5443492 | 2003-12-07 01:28:50 -0500 | [diff] [blame] | 237 | int flags EXT2FS_ATTR((unused))) |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 238 | { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 239 | char *buf; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 240 | ssize_t actual, size; |
| 241 | errcode_t retval; |
| 242 | |
| 243 | size = fs->blocksize * (fs->group_desc_count + 1); |
| 244 | buf = malloc(size); |
| 245 | if (!buf) |
| 246 | return ENOMEM; |
| 247 | |
| 248 | /* |
| 249 | * Read it all in. |
| 250 | */ |
| 251 | actual = read(fd, buf, size); |
| 252 | if (actual == -1) { |
Theodore Ts'o | b94bd81 | 2001-01-12 17:26:05 +0000 | [diff] [blame] | 253 | retval = errno; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 254 | goto errout; |
| 255 | } |
| 256 | if (actual != size) { |
| 257 | retval = EXT2_ET_SHORT_READ; |
| 258 | goto errout; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Now copy in the superblock and group descriptors |
| 263 | */ |
| 264 | memcpy(fs->super, buf, SUPERBLOCK_SIZE); |
| 265 | |
| 266 | memcpy(fs->group_desc, buf + fs->blocksize, |
| 267 | fs->blocksize * fs->group_desc_count); |
| 268 | |
| 269 | retval = 0; |
| 270 | |
| 271 | errout: |
| 272 | free(buf); |
| 273 | return retval; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Write the block/inode bitmaps. |
| 278 | */ |
| 279 | errcode_t ext2fs_image_bitmap_write(ext2_filsys fs, int fd, int flags) |
| 280 | { |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 281 | ext2fs_generic_bitmap bmap; |
Theodore Ts'o | e350773 | 2013-01-01 13:28:27 -0500 | [diff] [blame] | 282 | errcode_t retval; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 283 | ssize_t actual; |
| 284 | __u32 itr, cnt, size; |
| 285 | int c, total_size; |
| 286 | char buf[1024]; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 287 | |
| 288 | if (flags & IMAGER_FLAG_INODEMAP) { |
| 289 | if (!fs->inode_map) { |
| 290 | retval = ext2fs_read_inode_bitmap(fs); |
| 291 | if (retval) |
| 292 | return retval; |
| 293 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 294 | bmap = fs->inode_map; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 295 | itr = 1; |
| 296 | cnt = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count; |
Theodore Ts'o | a78926e | 2001-05-03 04:02:29 +0000 | [diff] [blame] | 297 | size = (EXT2_INODES_PER_GROUP(fs->super) / 8); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 298 | } else { |
| 299 | if (!fs->block_map) { |
| 300 | retval = ext2fs_read_block_bitmap(fs); |
| 301 | if (retval) |
| 302 | return retval; |
| 303 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 304 | bmap = fs->block_map; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 305 | itr = fs->super->s_first_data_block; |
| 306 | cnt = EXT2_BLOCKS_PER_GROUP(fs->super) * fs->group_desc_count; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 307 | size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8; |
| 308 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 309 | total_size = size * fs->group_desc_count; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 310 | |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 311 | while (cnt > 0) { |
| 312 | size = sizeof(buf); |
| 313 | if (size > (cnt >> 3)) |
| 314 | size = (cnt >> 3); |
| 315 | |
Valerie Aurora Henson | 8f82ef9 | 2009-08-05 00:27:10 -0400 | [diff] [blame] | 316 | retval = ext2fs_get_generic_bmap_range(bmap, itr, |
| 317 | size << 3, buf); |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 318 | if (retval) |
| 319 | return retval; |
| 320 | |
| 321 | actual = write(fd, buf, size); |
| 322 | if (actual == -1) |
| 323 | return errno; |
| 324 | if (actual != (int) size) |
| 325 | return EXT2_ET_SHORT_READ; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 326 | |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 327 | itr += size << 3; |
| 328 | cnt -= size << 3; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 329 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 330 | |
| 331 | size = total_size % fs->blocksize; |
| 332 | memset(buf, 0, sizeof(buf)); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 333 | if (size) { |
| 334 | size = fs->blocksize - size; |
| 335 | while (size) { |
| 336 | c = size; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 337 | if (c > (int) sizeof(buf)) |
| 338 | c = sizeof(buf); |
| 339 | actual = write(fd, buf, c); |
| 340 | if (actual == -1) |
| 341 | return errno; |
| 342 | if (actual != c) |
| 343 | return EXT2_ET_SHORT_WRITE; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 344 | size -= c; |
| 345 | } |
| 346 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 347 | return 0; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | |
| 351 | /* |
| 352 | * Read the block/inode bitmaps. |
| 353 | */ |
| 354 | errcode_t ext2fs_image_bitmap_read(ext2_filsys fs, int fd, int flags) |
| 355 | { |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 356 | ext2fs_generic_bitmap bmap; |
Theodore Ts'o | e350773 | 2013-01-01 13:28:27 -0500 | [diff] [blame] | 357 | errcode_t retval; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 358 | __u32 itr, cnt; |
| 359 | char buf[1024]; |
| 360 | unsigned int size; |
| 361 | ssize_t actual; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 362 | |
| 363 | if (flags & IMAGER_FLAG_INODEMAP) { |
| 364 | if (!fs->inode_map) { |
| 365 | retval = ext2fs_read_inode_bitmap(fs); |
| 366 | if (retval) |
| 367 | return retval; |
| 368 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 369 | bmap = fs->inode_map; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 370 | itr = 1; |
| 371 | cnt = EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count; |
Theodore Ts'o | a78926e | 2001-05-03 04:02:29 +0000 | [diff] [blame] | 372 | size = (EXT2_INODES_PER_GROUP(fs->super) / 8); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 373 | } else { |
| 374 | if (!fs->block_map) { |
| 375 | retval = ext2fs_read_block_bitmap(fs); |
| 376 | if (retval) |
| 377 | return retval; |
| 378 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 379 | bmap = fs->block_map; |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 380 | itr = fs->super->s_first_data_block; |
| 381 | cnt = EXT2_BLOCKS_PER_GROUP(fs->super) * fs->group_desc_count; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 382 | size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8; |
| 383 | } |
| 384 | |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 385 | while (cnt > 0) { |
| 386 | size = sizeof(buf); |
| 387 | if (size > (cnt >> 3)) |
| 388 | size = (cnt >> 3); |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 389 | |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 390 | actual = read(fd, buf, size); |
| 391 | if (actual == -1) |
| 392 | return errno; |
| 393 | if (actual != (int) size) |
| 394 | return EXT2_ET_SHORT_READ; |
| 395 | |
Valerie Aurora Henson | 8f82ef9 | 2009-08-05 00:27:10 -0400 | [diff] [blame] | 396 | retval = ext2fs_set_generic_bmap_range(bmap, itr, |
| 397 | size << 3, buf); |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 398 | if (retval) |
| 399 | return retval; |
| 400 | |
| 401 | itr += size << 3; |
| 402 | cnt -= size << 3; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 403 | } |
Theodore Ts'o | f1f115a | 2007-07-23 04:32:48 -0400 | [diff] [blame] | 404 | return 0; |
Theodore Ts'o | 72ed126 | 2000-11-12 19:32:20 +0000 | [diff] [blame] | 405 | } |