Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1 | /* |
| 2 | * extent.c --- routines to implement extents support |
| 3 | * |
| 4 | * Copyright (C) 2007 Theodore Ts'o. |
| 5 | * |
| 6 | * %Begin-Header% |
Theodore Ts'o | 543547a | 2010-05-17 21:31:56 -0400 | [diff] [blame] | 7 | * This file may be redistributed under the terms of the GNU Library |
| 8 | * General Public License, version 2. |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 9 | * %End-Header% |
| 10 | */ |
| 11 | |
Theodore Ts'o | d1154eb | 2011-09-18 17:34:37 -0400 | [diff] [blame] | 12 | #include "config.h" |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #if HAVE_UNISTD_H |
| 16 | #include <unistd.h> |
| 17 | #endif |
| 18 | #if HAVE_ERRNO_H |
| 19 | #include <errno.h> |
| 20 | #endif |
| 21 | #if HAVE_SYS_STAT_H |
| 22 | #include <sys/stat.h> |
| 23 | #endif |
| 24 | #if HAVE_SYS_TYPES_H |
| 25 | #include <sys/types.h> |
| 26 | #endif |
| 27 | |
| 28 | #include "ext2_fs.h" |
| 29 | #include "ext2fsP.h" |
| 30 | #include "e2image.h" |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 31 | |
| 32 | /* |
| 33 | * Definitions to be dropped in lib/ext2fs/ext2fs.h |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Private definitions |
| 38 | */ |
| 39 | |
| 40 | struct extent_path { |
| 41 | char *buf; |
| 42 | int entries; |
| 43 | int max_entries; |
| 44 | int left; |
| 45 | int visit_num; |
| 46 | int flags; |
| 47 | blk64_t end_blk; |
| 48 | void *curr; |
| 49 | }; |
| 50 | |
| 51 | |
| 52 | struct ext2_extent_handle { |
| 53 | errcode_t magic; |
| 54 | ext2_filsys fs; |
| 55 | ext2_ino_t ino; |
| 56 | struct ext2_inode *inode; |
Theodore Ts'o | f03bb73 | 2010-07-22 09:27:45 -0400 | [diff] [blame] | 57 | struct ext2_inode inodebuf; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 58 | int type; |
| 59 | int level; |
| 60 | int max_depth; |
| 61 | struct extent_path *path; |
| 62 | }; |
| 63 | |
| 64 | struct ext2_extent_path { |
| 65 | errcode_t magic; |
| 66 | int leaf_height; |
| 67 | blk64_t lblk; |
| 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Useful Debugging stuff |
| 72 | */ |
| 73 | |
| 74 | #ifdef DEBUG |
| 75 | static void dbg_show_header(struct ext3_extent_header *eh) |
| 76 | { |
| 77 | printf("header: magic=%x entries=%u max=%u depth=%u generation=%u\n", |
Aneesh Kumar K.V | ac24e62 | 2008-07-18 17:35:40 +0530 | [diff] [blame] | 78 | ext2fs_le16_to_cpu(eh->eh_magic), |
| 79 | ext2fs_le16_to_cpu(eh->eh_entries), |
| 80 | ext2fs_le16_to_cpu(eh->eh_max), |
| 81 | ext2fs_le16_to_cpu(eh->eh_depth), |
| 82 | ext2fs_le32_to_cpu(eh->eh_generation)); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | static void dbg_show_index(struct ext3_extent_idx *ix) |
| 86 | { |
| 87 | printf("index: block=%u leaf=%u leaf_hi=%u unused=%u\n", |
Aneesh Kumar K.V | ac24e62 | 2008-07-18 17:35:40 +0530 | [diff] [blame] | 88 | ext2fs_le32_to_cpu(ix->ei_block), |
| 89 | ext2fs_le32_to_cpu(ix->ei_leaf), |
| 90 | ext2fs_le16_to_cpu(ix->ei_leaf_hi), |
| 91 | ext2fs_le16_to_cpu(ix->ei_unused)); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | static void dbg_show_extent(struct ext3_extent *ex) |
| 95 | { |
| 96 | printf("extent: block=%u-%u len=%u start=%u start_hi=%u\n", |
Aneesh Kumar K.V | ac24e62 | 2008-07-18 17:35:40 +0530 | [diff] [blame] | 97 | ext2fs_le32_to_cpu(ex->ee_block), |
| 98 | ext2fs_le32_to_cpu(ex->ee_block) + |
| 99 | ext2fs_le16_to_cpu(ex->ee_len) - 1, |
| 100 | ext2fs_le16_to_cpu(ex->ee_len), |
| 101 | ext2fs_le32_to_cpu(ex->ee_start), |
| 102 | ext2fs_le16_to_cpu(ex->ee_start_hi)); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | static void dbg_print_extent(char *desc, struct ext2fs_extent *extent) |
| 106 | { |
| 107 | if (desc) |
| 108 | printf("%s: ", desc); |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 109 | printf("extent: lblk %llu--%llu, len %u, pblk %llu, flags: ", |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 110 | extent->e_lblk, extent->e_lblk + extent->e_len - 1, |
| 111 | extent->e_len, extent->e_pblk); |
| 112 | if (extent->e_flags & EXT2_EXTENT_FLAGS_LEAF) |
| 113 | fputs("LEAF ", stdout); |
| 114 | if (extent->e_flags & EXT2_EXTENT_FLAGS_UNINIT) |
| 115 | fputs("UNINIT ", stdout); |
| 116 | if (extent->e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT) |
| 117 | fputs("2ND_VISIT ", stdout); |
| 118 | if (!extent->e_flags) |
| 119 | fputs("(none)", stdout); |
| 120 | fputc('\n', stdout); |
| 121 | |
| 122 | } |
| 123 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 124 | #else |
| 125 | #define dbg_show_header(eh) do { } while (0) |
| 126 | #define dbg_show_index(ix) do { } while (0) |
| 127 | #define dbg_show_extent(ex) do { } while (0) |
| 128 | #define dbg_print_extent(desc, ex) do { } while (0) |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 129 | #endif |
| 130 | |
| 131 | /* |
| 132 | * Verify the extent header as being sane |
| 133 | */ |
| 134 | errcode_t ext2fs_extent_header_verify(void *ptr, int size) |
| 135 | { |
| 136 | int eh_max, entry_size; |
| 137 | struct ext3_extent_header *eh = ptr; |
| 138 | |
| 139 | dbg_show_header(eh); |
| 140 | if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC) |
| 141 | return EXT2_ET_EXTENT_HEADER_BAD; |
| 142 | if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max)) |
| 143 | return EXT2_ET_EXTENT_HEADER_BAD; |
| 144 | if (eh->eh_depth == 0) |
| 145 | entry_size = sizeof(struct ext3_extent); |
| 146 | else |
| 147 | entry_size = sizeof(struct ext3_extent_idx); |
| 148 | |
| 149 | eh_max = (size - sizeof(*eh)) / entry_size; |
| 150 | /* Allow two extent-sized items at the end of the block, for |
| 151 | * ext4_extent_tail with checksum in the future. */ |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 152 | if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) || |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 153 | (ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2))) |
| 154 | return EXT2_ET_EXTENT_HEADER_BAD; |
| 155 | |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | /* |
| 161 | * Begin functions to handle an inode's extent information |
| 162 | */ |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 163 | extern void ext2fs_extent_free(ext2_extent_handle_t handle) |
| 164 | { |
| 165 | int i; |
| 166 | |
| 167 | if (!handle) |
| 168 | return; |
| 169 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 170 | if (handle->path) { |
Theodore Ts'o | 7b59b4a | 2009-06-15 01:34:43 -0400 | [diff] [blame] | 171 | for (i=1; i <= handle->max_depth; i++) { |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 172 | if (handle->path[i].buf) |
| 173 | ext2fs_free_mem(&handle->path[i].buf); |
| 174 | } |
Valerie Clement | d46d67a | 2008-02-21 16:39:23 +0100 | [diff] [blame] | 175 | ext2fs_free_mem(&handle->path); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 176 | } |
| 177 | ext2fs_free_mem(&handle); |
| 178 | } |
| 179 | |
| 180 | extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino, |
| 181 | ext2_extent_handle_t *ret_handle) |
| 182 | { |
number9652 | 84b239a | 2009-05-19 13:34:12 -0700 | [diff] [blame] | 183 | return ext2fs_extent_open2(fs, ino, NULL, ret_handle); |
| 184 | } |
| 185 | |
| 186 | extern errcode_t ext2fs_extent_open2(ext2_filsys fs, ext2_ino_t ino, |
| 187 | struct ext2_inode *inode, |
| 188 | ext2_extent_handle_t *ret_handle) |
| 189 | { |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 190 | struct ext2_extent_handle *handle; |
| 191 | errcode_t retval; |
Theodore Ts'o | aa8e2f1 | 2008-06-02 00:08:19 -0400 | [diff] [blame] | 192 | int i; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 193 | struct ext3_extent_header *eh; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 194 | |
| 195 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| 196 | |
number9652 | 84b239a | 2009-05-19 13:34:12 -0700 | [diff] [blame] | 197 | if (!inode) |
| 198 | if ((ino == 0) || (ino > fs->super->s_inodes_count)) |
| 199 | return EXT2_ET_BAD_INODE_NUM; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 200 | |
| 201 | retval = ext2fs_get_mem(sizeof(struct ext2_extent_handle), &handle); |
| 202 | if (retval) |
| 203 | return retval; |
| 204 | memset(handle, 0, sizeof(struct ext2_extent_handle)); |
| 205 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 206 | handle->ino = ino; |
| 207 | handle->fs = fs; |
| 208 | |
number9652 | 84b239a | 2009-05-19 13:34:12 -0700 | [diff] [blame] | 209 | if (inode) { |
Theodore Ts'o | f03bb73 | 2010-07-22 09:27:45 -0400 | [diff] [blame] | 210 | handle->inode = inode; |
| 211 | } else { |
| 212 | handle->inode = &handle->inodebuf; |
number9652 | 84b239a | 2009-05-19 13:34:12 -0700 | [diff] [blame] | 213 | retval = ext2fs_read_inode(fs, ino, handle->inode); |
| 214 | if (retval) |
| 215 | goto errout; |
| 216 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 217 | |
Theodore Ts'o | aa8e2f1 | 2008-06-02 00:08:19 -0400 | [diff] [blame] | 218 | eh = (struct ext3_extent_header *) &handle->inode->i_block[0]; |
| 219 | |
| 220 | for (i=0; i < EXT2_N_BLOCKS; i++) |
| 221 | if (handle->inode->i_block[i]) |
| 222 | break; |
| 223 | if (i >= EXT2_N_BLOCKS) { |
| 224 | eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC); |
| 225 | eh->eh_depth = 0; |
| 226 | eh->eh_entries = 0; |
| 227 | i = (sizeof(handle->inode->i_block) - sizeof(*eh)) / |
| 228 | sizeof(struct ext3_extent); |
| 229 | eh->eh_max = ext2fs_cpu_to_le16(i); |
| 230 | handle->inode->i_flags |= EXT4_EXTENTS_FL; |
| 231 | } |
| 232 | |
Manish Katiyar | f93d9f6 | 2008-08-16 02:26:43 +0530 | [diff] [blame] | 233 | if (!(handle->inode->i_flags & EXT4_EXTENTS_FL)) { |
| 234 | retval = EXT2_ET_INODE_NOT_EXTENT; |
| 235 | goto errout; |
| 236 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 237 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 238 | retval = ext2fs_extent_header_verify(eh, sizeof(handle->inode->i_block)); |
| 239 | if (retval) |
Manish Katiyar | f93d9f6 | 2008-08-16 02:26:43 +0530 | [diff] [blame] | 240 | goto errout; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 241 | |
| 242 | handle->max_depth = ext2fs_le16_to_cpu(eh->eh_depth); |
| 243 | handle->type = ext2fs_le16_to_cpu(eh->eh_magic); |
| 244 | |
| 245 | retval = ext2fs_get_mem(((handle->max_depth+1) * |
| 246 | sizeof(struct extent_path)), |
| 247 | &handle->path); |
| 248 | memset(handle->path, 0, |
| 249 | (handle->max_depth+1) * sizeof(struct extent_path)); |
| 250 | handle->path[0].buf = (char *) handle->inode->i_block; |
| 251 | |
| 252 | handle->path[0].left = handle->path[0].entries = |
| 253 | ext2fs_le16_to_cpu(eh->eh_entries); |
| 254 | handle->path[0].max_entries = ext2fs_le16_to_cpu(eh->eh_max); |
| 255 | handle->path[0].curr = 0; |
| 256 | handle->path[0].end_blk = |
Andreas Dilger | 0bd0e59 | 2011-07-08 17:54:57 -0600 | [diff] [blame] | 257 | (EXT2_I_SIZE(handle->inode) + fs->blocksize - 1) >> |
| 258 | EXT2_BLOCK_SIZE_BITS(fs->super); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 259 | handle->path[0].visit_num = 1; |
| 260 | handle->level = 0; |
| 261 | handle->magic = EXT2_ET_MAGIC_EXTENT_HANDLE; |
| 262 | |
| 263 | *ret_handle = handle; |
| 264 | return 0; |
| 265 | |
| 266 | errout: |
| 267 | ext2fs_extent_free(handle); |
| 268 | return retval; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * This function is responsible for (optionally) moving through the |
| 273 | * extent tree and then returning the current extent |
| 274 | */ |
| 275 | errcode_t ext2fs_extent_get(ext2_extent_handle_t handle, |
| 276 | int flags, struct ext2fs_extent *extent) |
| 277 | { |
| 278 | struct extent_path *path, *newpath; |
| 279 | struct ext3_extent_header *eh; |
| 280 | struct ext3_extent_idx *ix = 0; |
| 281 | struct ext3_extent *ex; |
| 282 | errcode_t retval; |
Valerie Aurora Henson | 6d8b37f | 2010-06-13 11:00:00 -0400 | [diff] [blame] | 283 | blk64_t blk; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 284 | blk64_t end_blk; |
| 285 | int orig_op, op; |
| 286 | |
| 287 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 288 | |
| 289 | if (!handle->path) |
| 290 | return EXT2_ET_NO_CURRENT_NODE; |
| 291 | |
| 292 | orig_op = op = flags & EXT2_EXTENT_MOVE_MASK; |
| 293 | |
| 294 | retry: |
| 295 | path = handle->path + handle->level; |
| 296 | if ((orig_op == EXT2_EXTENT_NEXT) || |
| 297 | (orig_op == EXT2_EXTENT_NEXT_LEAF)) { |
| 298 | if (handle->level < handle->max_depth) { |
| 299 | /* interior node */ |
| 300 | if (path->visit_num == 0) { |
| 301 | path->visit_num++; |
| 302 | op = EXT2_EXTENT_DOWN; |
| 303 | } else if (path->left > 0) |
| 304 | op = EXT2_EXTENT_NEXT_SIB; |
| 305 | else if (handle->level > 0) |
| 306 | op = EXT2_EXTENT_UP; |
| 307 | else |
| 308 | return EXT2_ET_EXTENT_NO_NEXT; |
| 309 | } else { |
| 310 | /* leaf node */ |
| 311 | if (path->left > 0) |
| 312 | op = EXT2_EXTENT_NEXT_SIB; |
| 313 | else if (handle->level > 0) |
| 314 | op = EXT2_EXTENT_UP; |
| 315 | else |
| 316 | return EXT2_ET_EXTENT_NO_NEXT; |
| 317 | } |
| 318 | if (op != EXT2_EXTENT_NEXT_SIB) { |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 319 | #ifdef DEBUG_GET_EXTENT |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 320 | printf("<<<< OP = %s\n", |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 321 | (op == EXT2_EXTENT_DOWN) ? "down" : |
| 322 | ((op == EXT2_EXTENT_UP) ? "up" : "unknown")); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 323 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 324 | } |
| 325 | } |
| 326 | |
| 327 | if ((orig_op == EXT2_EXTENT_PREV) || |
| 328 | (orig_op == EXT2_EXTENT_PREV_LEAF)) { |
| 329 | if (handle->level < handle->max_depth) { |
| 330 | /* interior node */ |
| 331 | if (path->visit_num > 0 ) { |
| 332 | /* path->visit_num = 0; */ |
| 333 | op = EXT2_EXTENT_DOWN_AND_LAST; |
| 334 | } else if (path->left < path->entries-1) |
| 335 | op = EXT2_EXTENT_PREV_SIB; |
| 336 | else if (handle->level > 0) |
| 337 | op = EXT2_EXTENT_UP; |
| 338 | else |
| 339 | return EXT2_ET_EXTENT_NO_PREV; |
| 340 | } else { |
| 341 | /* leaf node */ |
| 342 | if (path->left < path->entries-1) |
| 343 | op = EXT2_EXTENT_PREV_SIB; |
| 344 | else if (handle->level > 0) |
| 345 | op = EXT2_EXTENT_UP; |
| 346 | else |
| 347 | return EXT2_ET_EXTENT_NO_PREV; |
| 348 | } |
| 349 | if (op != EXT2_EXTENT_PREV_SIB) { |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 350 | #ifdef DEBUG_GET_EXTENT |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 351 | printf("<<<< OP = %s\n", |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 352 | (op == EXT2_EXTENT_DOWN_AND_LAST) ? "down/last" : |
| 353 | ((op == EXT2_EXTENT_UP) ? "up" : "unknown")); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 354 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 355 | } |
| 356 | } |
| 357 | |
| 358 | if (orig_op == EXT2_EXTENT_LAST_LEAF) { |
| 359 | if ((handle->level < handle->max_depth) && |
| 360 | (path->left == 0)) |
| 361 | op = EXT2_EXTENT_DOWN; |
| 362 | else |
| 363 | op = EXT2_EXTENT_LAST_SIB; |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 364 | #ifdef DEBUG_GET_EXTENT |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 365 | printf("<<<< OP = %s\n", |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 366 | (op == EXT2_EXTENT_DOWN) ? "down" : "last_sib"); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 367 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | switch (op) { |
| 371 | case EXT2_EXTENT_CURRENT: |
| 372 | ix = path->curr; |
| 373 | break; |
| 374 | case EXT2_EXTENT_ROOT: |
| 375 | handle->level = 0; |
| 376 | path = handle->path + handle->level; |
Eric Sandeen | 9e30fb2 | 2011-09-16 15:49:23 -0500 | [diff] [blame] | 377 | /* fallthrough */ |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 378 | case EXT2_EXTENT_FIRST_SIB: |
| 379 | path->left = path->entries; |
| 380 | path->curr = 0; |
Eric Sandeen | 9e30fb2 | 2011-09-16 15:49:23 -0500 | [diff] [blame] | 381 | /* fallthrough */ |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 382 | case EXT2_EXTENT_NEXT_SIB: |
| 383 | if (path->left <= 0) |
| 384 | return EXT2_ET_EXTENT_NO_NEXT; |
| 385 | if (path->curr) { |
| 386 | ix = path->curr; |
| 387 | ix++; |
| 388 | } else { |
| 389 | eh = (struct ext3_extent_header *) path->buf; |
| 390 | ix = EXT_FIRST_INDEX(eh); |
| 391 | } |
| 392 | path->left--; |
| 393 | path->curr = ix; |
| 394 | path->visit_num = 0; |
| 395 | break; |
| 396 | case EXT2_EXTENT_PREV_SIB: |
| 397 | if (!path->curr || |
| 398 | path->left+1 >= path->entries) |
| 399 | return EXT2_ET_EXTENT_NO_PREV; |
| 400 | ix = path->curr; |
| 401 | ix--; |
| 402 | path->curr = ix; |
| 403 | path->left++; |
| 404 | if (handle->level < handle->max_depth) |
| 405 | path->visit_num = 1; |
| 406 | break; |
| 407 | case EXT2_EXTENT_LAST_SIB: |
| 408 | eh = (struct ext3_extent_header *) path->buf; |
| 409 | path->curr = EXT_LAST_EXTENT(eh); |
| 410 | ix = path->curr; |
| 411 | path->left = 0; |
| 412 | path->visit_num = 0; |
| 413 | break; |
| 414 | case EXT2_EXTENT_UP: |
| 415 | if (handle->level <= 0) |
| 416 | return EXT2_ET_EXTENT_NO_UP; |
| 417 | handle->level--; |
| 418 | path--; |
| 419 | ix = path->curr; |
| 420 | if ((orig_op == EXT2_EXTENT_PREV) || |
| 421 | (orig_op == EXT2_EXTENT_PREV_LEAF)) |
| 422 | path->visit_num = 0; |
| 423 | break; |
| 424 | case EXT2_EXTENT_DOWN: |
| 425 | case EXT2_EXTENT_DOWN_AND_LAST: |
| 426 | if (!path->curr ||(handle->level >= handle->max_depth)) |
| 427 | return EXT2_ET_EXTENT_NO_DOWN; |
| 428 | |
| 429 | ix = path->curr; |
| 430 | newpath = path + 1; |
| 431 | if (!newpath->buf) { |
| 432 | retval = ext2fs_get_mem(handle->fs->blocksize, |
| 433 | &newpath->buf); |
| 434 | if (retval) |
| 435 | return retval; |
| 436 | } |
| 437 | blk = ext2fs_le32_to_cpu(ix->ei_leaf) + |
Valerie Clement | e6bbc00 | 2008-02-21 16:39:23 +0100 | [diff] [blame] | 438 | ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 439 | if ((handle->fs->flags & EXT2_FLAG_IMAGE_FILE) && |
| 440 | (handle->fs->io != handle->fs->image_io)) |
| 441 | memset(newpath->buf, 0, handle->fs->blocksize); |
| 442 | else { |
Valerie Aurora Henson | 24a117a | 2009-09-07 21:14:24 -0400 | [diff] [blame] | 443 | retval = io_channel_read_blk64(handle->fs->io, |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 444 | blk, 1, newpath->buf); |
| 445 | if (retval) |
| 446 | return retval; |
| 447 | } |
| 448 | handle->level++; |
| 449 | |
| 450 | eh = (struct ext3_extent_header *) newpath->buf; |
| 451 | |
| 452 | retval = ext2fs_extent_header_verify(eh, handle->fs->blocksize); |
Theodore Ts'o | 7518c17 | 2008-12-25 22:42:38 -0500 | [diff] [blame] | 453 | if (retval) { |
| 454 | handle->level--; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 455 | return retval; |
Theodore Ts'o | 7518c17 | 2008-12-25 22:42:38 -0500 | [diff] [blame] | 456 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 457 | |
| 458 | newpath->left = newpath->entries = |
| 459 | ext2fs_le16_to_cpu(eh->eh_entries); |
| 460 | newpath->max_entries = ext2fs_le16_to_cpu(eh->eh_max); |
| 461 | |
| 462 | if (path->left > 0) { |
| 463 | ix++; |
| 464 | newpath->end_blk = ext2fs_le32_to_cpu(ix->ei_block); |
| 465 | } else |
| 466 | newpath->end_blk = path->end_blk; |
| 467 | |
| 468 | path = newpath; |
| 469 | if (op == EXT2_EXTENT_DOWN) { |
| 470 | ix = EXT_FIRST_INDEX((struct ext3_extent_header *) eh); |
| 471 | path->curr = ix; |
| 472 | path->left = path->entries - 1; |
| 473 | path->visit_num = 0; |
| 474 | } else { |
| 475 | ix = EXT_LAST_INDEX((struct ext3_extent_header *) eh); |
| 476 | path->curr = ix; |
| 477 | path->left = 0; |
| 478 | if (handle->level < handle->max_depth) |
| 479 | path->visit_num = 1; |
| 480 | } |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 481 | #ifdef DEBUG_GET_EXTENT |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 482 | printf("Down to level %d/%d, end_blk=%llu\n", |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 483 | handle->level, handle->max_depth, |
| 484 | path->end_blk); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 485 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 486 | break; |
| 487 | default: |
| 488 | return EXT2_ET_OP_NOT_SUPPORTED; |
| 489 | } |
| 490 | |
| 491 | if (!ix) |
| 492 | return EXT2_ET_NO_CURRENT_NODE; |
| 493 | |
| 494 | extent->e_flags = 0; |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 495 | #ifdef DEBUG_GET_EXTENT |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 496 | printf("(Left %d)\n", path->left); |
| 497 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 498 | |
| 499 | if (handle->level == handle->max_depth) { |
| 500 | ex = (struct ext3_extent *) ix; |
| 501 | |
| 502 | extent->e_pblk = ext2fs_le32_to_cpu(ex->ee_start) + |
| 503 | ((__u64) ext2fs_le16_to_cpu(ex->ee_start_hi) << 32); |
| 504 | extent->e_lblk = ext2fs_le32_to_cpu(ex->ee_block); |
| 505 | extent->e_len = ext2fs_le16_to_cpu(ex->ee_len); |
Eric Sandeen | 85b59c4 | 2008-03-19 15:20:18 -0500 | [diff] [blame] | 506 | extent->e_flags |= EXT2_EXTENT_FLAGS_LEAF; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 507 | if (extent->e_len > EXT_INIT_MAX_LEN) { |
| 508 | extent->e_len -= EXT_INIT_MAX_LEN; |
Eric Sandeen | 85b59c4 | 2008-03-19 15:20:18 -0500 | [diff] [blame] | 509 | extent->e_flags |= EXT2_EXTENT_FLAGS_UNINIT; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 510 | } |
| 511 | } else { |
| 512 | extent->e_pblk = ext2fs_le32_to_cpu(ix->ei_leaf) + |
| 513 | ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32); |
| 514 | extent->e_lblk = ext2fs_le32_to_cpu(ix->ei_block); |
| 515 | if (path->left > 0) { |
| 516 | ix++; |
| 517 | end_blk = ext2fs_le32_to_cpu(ix->ei_block); |
| 518 | } else |
| 519 | end_blk = path->end_blk; |
| 520 | |
| 521 | extent->e_len = end_blk - extent->e_lblk; |
| 522 | } |
| 523 | if (path->visit_num) |
| 524 | extent->e_flags |= EXT2_EXTENT_FLAGS_SECOND_VISIT; |
| 525 | |
| 526 | if (((orig_op == EXT2_EXTENT_NEXT_LEAF) || |
| 527 | (orig_op == EXT2_EXTENT_PREV_LEAF)) && |
| 528 | (handle->level != handle->max_depth)) |
| 529 | goto retry; |
| 530 | |
| 531 | if ((orig_op == EXT2_EXTENT_LAST_LEAF) && |
| 532 | ((handle->level != handle->max_depth) || |
| 533 | (path->left != 0))) |
| 534 | goto retry; |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | static errcode_t update_path(ext2_extent_handle_t handle) |
| 540 | { |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 541 | blk64_t blk; |
| 542 | errcode_t retval; |
| 543 | struct ext3_extent_idx *ix; |
| 544 | |
| 545 | if (handle->level == 0) { |
Eric Sandeen | 125a367 | 2009-06-17 18:49:01 -0400 | [diff] [blame] | 546 | retval = ext2fs_write_inode(handle->fs, handle->ino, |
| 547 | handle->inode); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 548 | } else { |
| 549 | ix = handle->path[handle->level - 1].curr; |
| 550 | blk = ext2fs_le32_to_cpu(ix->ei_leaf) + |
| 551 | ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32); |
| 552 | |
Valerie Aurora Henson | 24a117a | 2009-09-07 21:14:24 -0400 | [diff] [blame] | 553 | retval = io_channel_write_blk64(handle->fs->io, |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 554 | blk, 1, handle->path[handle->level].buf); |
| 555 | } |
| 556 | return retval; |
| 557 | } |
| 558 | |
Theodore Ts'o | 2d328bb | 2008-03-17 23:17:13 -0400 | [diff] [blame] | 559 | #if 0 |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 560 | errcode_t ext2fs_extent_save_path(ext2_extent_handle_t handle, |
| 561 | ext2_extent_path_t *ret_path) |
| 562 | { |
| 563 | ext2_extent_path_t save_path; |
| 564 | struct ext2fs_extent extent; |
| 565 | struct ext2_extent_info info; |
| 566 | errcode_t retval; |
| 567 | |
| 568 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent); |
| 569 | if (retval) |
| 570 | return retval; |
| 571 | |
| 572 | retval = ext2fs_extent_get_info(handle, &info); |
| 573 | if (retval) |
| 574 | return retval; |
| 575 | |
| 576 | retval = ext2fs_get_mem(sizeof(struct ext2_extent_path), &save_path); |
| 577 | if (retval) |
| 578 | return retval; |
| 579 | memset(save_path, 0, sizeof(struct ext2_extent_path)); |
| 580 | |
| 581 | save_path->magic = EXT2_ET_MAGIC_EXTENT_PATH; |
| 582 | save_path->leaf_height = info.max_depth - info.curr_level - 1; |
| 583 | save_path->lblk = extent.e_lblk; |
| 584 | |
| 585 | *ret_path = save_path; |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | errcode_t ext2fs_extent_free_path(ext2_extent_path_t path) |
| 590 | { |
| 591 | EXT2_CHECK_MAGIC(path, EXT2_ET_MAGIC_EXTENT_PATH); |
| 592 | |
| 593 | ext2fs_free_mem(&path); |
| 594 | return 0; |
| 595 | } |
Theodore Ts'o | 2d328bb | 2008-03-17 23:17:13 -0400 | [diff] [blame] | 596 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 597 | |
Eric Sandeen | c21ed77 | 2008-04-07 22:00:59 -0500 | [diff] [blame] | 598 | /* |
| 599 | * Go to the node at leaf_level which contains logical block blk. |
| 600 | * |
Eric Sandeen | 9817a2b | 2008-05-12 18:13:49 -0500 | [diff] [blame] | 601 | * leaf_level is height from the leaf node level, i.e. |
| 602 | * leaf_level 0 is at leaf node, leaf_level 1 is 1 above etc. |
| 603 | * |
Eric Sandeen | c21ed77 | 2008-04-07 22:00:59 -0500 | [diff] [blame] | 604 | * If "blk" has no mapping (hole) then handle is left at last |
| 605 | * extent before blk. |
| 606 | */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 607 | errcode_t ext2fs_extent_goto2(ext2_extent_handle_t handle, |
| 608 | int leaf_level, blk64_t blk) |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 609 | { |
Theodore Ts'o | 2d328bb | 2008-03-17 23:17:13 -0400 | [diff] [blame] | 610 | struct ext2fs_extent extent; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 611 | errcode_t retval; |
| 612 | |
| 613 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent); |
Theodore Ts'o | 9033faf | 2008-08-27 18:37:11 -0400 | [diff] [blame] | 614 | if (retval) { |
| 615 | if (retval == EXT2_ET_EXTENT_NO_NEXT) |
| 616 | retval = EXT2_ET_EXTENT_NOT_FOUND; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 617 | return retval; |
Theodore Ts'o | 9033faf | 2008-08-27 18:37:11 -0400 | [diff] [blame] | 618 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 619 | |
Eric Sandeen | 9817a2b | 2008-05-12 18:13:49 -0500 | [diff] [blame] | 620 | if (leaf_level > handle->max_depth) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 621 | #ifdef DEBUG |
| 622 | printf("leaf level %d greater than tree depth %d\n", |
Eric Sandeen | 9817a2b | 2008-05-12 18:13:49 -0500 | [diff] [blame] | 623 | leaf_level, handle->max_depth); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 624 | #endif |
Eric Sandeen | 9817a2b | 2008-05-12 18:13:49 -0500 | [diff] [blame] | 625 | return EXT2_ET_OP_NOT_SUPPORTED; |
| 626 | } |
| 627 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 628 | #ifdef DEBUG |
| 629 | printf("goto extent ino %u, level %d, %llu\n", handle->ino, |
| 630 | leaf_level, blk); |
| 631 | #endif |
| 632 | |
| 633 | #ifdef DEBUG_GOTO_EXTENTS |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 634 | dbg_print_extent("root", &extent); |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 635 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 636 | while (1) { |
Eric Sandeen | 9817a2b | 2008-05-12 18:13:49 -0500 | [diff] [blame] | 637 | if (handle->max_depth - handle->level == leaf_level) { |
Eric Sandeen | c21ed77 | 2008-04-07 22:00:59 -0500 | [diff] [blame] | 638 | /* block is in this &extent */ |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 639 | if ((blk >= extent.e_lblk) && |
| 640 | (blk < extent.e_lblk + extent.e_len)) |
| 641 | return 0; |
Eric Sandeen | c21ed77 | 2008-04-07 22:00:59 -0500 | [diff] [blame] | 642 | if (blk < extent.e_lblk) { |
| 643 | retval = ext2fs_extent_get(handle, |
| 644 | EXT2_EXTENT_PREV_SIB, |
| 645 | &extent); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 646 | return EXT2_ET_EXTENT_NOT_FOUND; |
Eric Sandeen | c21ed77 | 2008-04-07 22:00:59 -0500 | [diff] [blame] | 647 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 648 | retval = ext2fs_extent_get(handle, |
| 649 | EXT2_EXTENT_NEXT_SIB, |
| 650 | &extent); |
| 651 | if (retval == EXT2_ET_EXTENT_NO_NEXT) |
| 652 | return EXT2_ET_EXTENT_NOT_FOUND; |
| 653 | if (retval) |
| 654 | return retval; |
| 655 | continue; |
| 656 | } |
| 657 | |
| 658 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_SIB, |
| 659 | &extent); |
| 660 | if (retval == EXT2_ET_EXTENT_NO_NEXT) |
| 661 | goto go_down; |
| 662 | if (retval) |
| 663 | return retval; |
| 664 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 665 | #ifdef DEBUG_GOTO_EXTENTS |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 666 | dbg_print_extent("next", &extent); |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 667 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 668 | if (blk == extent.e_lblk) |
| 669 | goto go_down; |
| 670 | if (blk > extent.e_lblk) |
| 671 | continue; |
| 672 | |
| 673 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_PREV_SIB, |
| 674 | &extent); |
| 675 | if (retval) |
| 676 | return retval; |
| 677 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 678 | #ifdef DEBUG_GOTO_EXTENTS |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 679 | dbg_print_extent("prev", &extent); |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 680 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 681 | |
| 682 | go_down: |
| 683 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_DOWN, |
| 684 | &extent); |
| 685 | if (retval) |
| 686 | return retval; |
| 687 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 688 | #ifdef DEBUG_GOTO_EXTENTS |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 689 | dbg_print_extent("down", &extent); |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 690 | #endif |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 691 | } |
| 692 | } |
| 693 | |
| 694 | errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle, |
| 695 | blk64_t blk) |
| 696 | { |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 697 | return ext2fs_extent_goto2(handle, 0, blk); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 698 | } |
| 699 | |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 700 | /* |
| 701 | * Traverse back up to root fixing parents of current node as needed. |
| 702 | * |
| 703 | * If we changed start of first entry in a node, fix parent index start |
| 704 | * and so on. |
| 705 | * |
| 706 | * Safe to call for any position in node; if not at the first entry, |
| 707 | * will simply return. |
| 708 | */ |
Eric Sandeen | 789bd40 | 2012-12-20 14:05:01 -0500 | [diff] [blame] | 709 | errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle) |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 710 | { |
| 711 | int retval = 0; |
Theodore Ts'o | eacf6a0 | 2012-12-20 18:27:33 -0500 | [diff] [blame] | 712 | int orig_height; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 713 | blk64_t start; |
| 714 | struct extent_path *path; |
| 715 | struct ext2fs_extent extent; |
Theodore Ts'o | eacf6a0 | 2012-12-20 18:27:33 -0500 | [diff] [blame] | 716 | struct ext2_extent_info info; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 717 | |
| 718 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 719 | |
| 720 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 721 | return EXT2_ET_RO_FILSYS; |
| 722 | |
| 723 | if (!handle->path) |
| 724 | return EXT2_ET_NO_CURRENT_NODE; |
| 725 | |
| 726 | path = handle->path + handle->level; |
| 727 | if (!path->curr) |
| 728 | return EXT2_ET_NO_CURRENT_NODE; |
| 729 | |
| 730 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent); |
| 731 | if (retval) |
| 732 | goto done; |
| 733 | |
| 734 | /* modified node's start block */ |
| 735 | start = extent.e_lblk; |
| 736 | |
Theodore Ts'o | eacf6a0 | 2012-12-20 18:27:33 -0500 | [diff] [blame] | 737 | if ((retval = ext2fs_extent_get_info(handle, &info))) |
| 738 | return retval; |
| 739 | orig_height = info.max_depth - info.curr_level; |
| 740 | |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 741 | /* traverse up until index not first, or startblk matches, or top */ |
| 742 | while (handle->level > 0 && |
| 743 | (path->left == path->entries - 1)) { |
| 744 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent); |
| 745 | if (retval) |
| 746 | goto done; |
| 747 | if (extent.e_lblk == start) |
| 748 | break; |
| 749 | path = handle->path + handle->level; |
| 750 | extent.e_len += (extent.e_lblk - start); |
| 751 | extent.e_lblk = start; |
| 752 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 753 | if (retval) |
| 754 | goto done; |
| 755 | update_path(handle); |
| 756 | } |
| 757 | |
| 758 | /* put handle back to where we started */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 759 | retval = ext2fs_extent_goto2(handle, orig_height, start); |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 760 | done: |
| 761 | return retval; |
| 762 | } |
| 763 | |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 764 | errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle, |
Theodore Ts'o | 2d328bb | 2008-03-17 23:17:13 -0400 | [diff] [blame] | 765 | int flags EXT2FS_ATTR((unused)), |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 766 | struct ext2fs_extent *extent) |
| 767 | { |
| 768 | struct extent_path *path; |
| 769 | struct ext3_extent_idx *ix; |
| 770 | struct ext3_extent *ex; |
| 771 | |
| 772 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 773 | |
| 774 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 775 | return EXT2_ET_RO_FILSYS; |
| 776 | |
| 777 | if (!handle->path) |
| 778 | return EXT2_ET_NO_CURRENT_NODE; |
| 779 | |
| 780 | path = handle->path + handle->level; |
| 781 | if (!path->curr) |
| 782 | return EXT2_ET_NO_CURRENT_NODE; |
| 783 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 784 | #ifdef DEBUG |
| 785 | printf("extent replace: %u ", handle->ino); |
| 786 | dbg_print_extent(0, extent); |
| 787 | #endif |
| 788 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 789 | if (handle->level == handle->max_depth) { |
| 790 | ex = path->curr; |
| 791 | |
| 792 | ex->ee_block = ext2fs_cpu_to_le32(extent->e_lblk); |
| 793 | ex->ee_start = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF); |
| 794 | ex->ee_start_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32); |
Theodore Ts'o | 05a32de | 2008-06-01 22:56:37 -0400 | [diff] [blame] | 795 | if (extent->e_flags & EXT2_EXTENT_FLAGS_UNINIT) { |
| 796 | if (extent->e_len > EXT_UNINIT_MAX_LEN) |
| 797 | return EXT2_ET_EXTENT_INVALID_LENGTH; |
| 798 | ex->ee_len = ext2fs_cpu_to_le16(extent->e_len + |
| 799 | EXT_INIT_MAX_LEN); |
| 800 | } else { |
| 801 | if (extent->e_len > EXT_INIT_MAX_LEN) |
| 802 | return EXT2_ET_EXTENT_INVALID_LENGTH; |
| 803 | ex->ee_len = ext2fs_cpu_to_le16(extent->e_len); |
| 804 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 805 | } else { |
| 806 | ix = path->curr; |
| 807 | |
| 808 | ix->ei_leaf = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF); |
| 809 | ix->ei_leaf_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32); |
| 810 | ix->ei_block = ext2fs_cpu_to_le32(extent->e_lblk); |
| 811 | ix->ei_unused = 0; |
| 812 | } |
| 813 | update_path(handle); |
| 814 | return 0; |
| 815 | } |
| 816 | |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 817 | /* |
| 818 | * allocate a new block, move half the current node to it, and update parent |
| 819 | * |
| 820 | * handle will be left pointing at original record. |
| 821 | */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 822 | errcode_t ext2fs_extent_node_split(ext2_extent_handle_t handle) |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 823 | { |
| 824 | errcode_t retval = 0; |
Valerie Aurora Henson | 6d8b37f | 2010-06-13 11:00:00 -0400 | [diff] [blame] | 825 | blk64_t new_node_pblk; |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 826 | blk64_t new_node_start; |
| 827 | blk64_t orig_lblk; |
| 828 | blk64_t goal_blk = 0; |
| 829 | int orig_height; |
| 830 | char *block_buf = NULL; |
| 831 | struct ext2fs_extent extent; |
| 832 | struct extent_path *path, *newpath = 0; |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 833 | struct ext3_extent_header *eh, *neweh; |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 834 | int tocopy; |
| 835 | int new_root = 0; |
| 836 | struct ext2_extent_info info; |
| 837 | |
| 838 | /* basic sanity */ |
| 839 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 840 | |
| 841 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 842 | return EXT2_ET_RO_FILSYS; |
| 843 | |
| 844 | if (!handle->path) |
| 845 | return EXT2_ET_NO_CURRENT_NODE; |
| 846 | |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 847 | #ifdef DEBUG |
| 848 | printf("splitting node at level %d\n", handle->level); |
| 849 | #endif |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 850 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent); |
| 851 | if (retval) |
| 852 | goto done; |
| 853 | |
| 854 | retval = ext2fs_extent_get_info(handle, &info); |
| 855 | if (retval) |
| 856 | goto done; |
| 857 | |
| 858 | /* save the position we were originally splitting... */ |
| 859 | orig_height = info.max_depth - info.curr_level; |
| 860 | orig_lblk = extent.e_lblk; |
| 861 | |
| 862 | /* Is there room in the parent for a new entry? */ |
| 863 | if (handle->level && |
| 864 | (handle->path[handle->level - 1].entries >= |
| 865 | handle->path[handle->level - 1].max_entries)) { |
| 866 | |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 867 | #ifdef DEBUG |
| 868 | printf("parent level %d full; splitting it too\n", |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 869 | handle->level - 1); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 870 | #endif |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 871 | /* split the parent */ |
| 872 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent); |
| 873 | if (retval) |
| 874 | goto done; |
| 875 | goal_blk = extent.e_pblk; |
| 876 | |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 877 | retval = ext2fs_extent_node_split(handle); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 878 | if (retval) |
| 879 | goto done; |
| 880 | |
| 881 | /* get handle back to our original split position */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 882 | retval = ext2fs_extent_goto2(handle, orig_height, orig_lblk); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 883 | if (retval) |
| 884 | goto done; |
| 885 | } |
| 886 | |
| 887 | /* At this point, parent should have room for this split */ |
| 888 | path = handle->path + handle->level; |
| 889 | if (!path->curr) |
| 890 | return EXT2_ET_NO_CURRENT_NODE; |
| 891 | |
| 892 | /* extent header of the current node we'll split */ |
| 893 | eh = (struct ext3_extent_header *)path->buf; |
| 894 | |
| 895 | /* splitting root level means moving them all out */ |
| 896 | if (handle->level == 0) { |
| 897 | new_root = 1; |
| 898 | tocopy = ext2fs_le16_to_cpu(eh->eh_entries); |
| 899 | retval = ext2fs_get_mem(((handle->max_depth+2) * |
| 900 | sizeof(struct extent_path)), |
| 901 | &newpath); |
| 902 | if (retval) |
| 903 | goto done; |
| 904 | memset(newpath, 0, |
| 905 | ((handle->max_depth+2) * sizeof(struct extent_path))); |
| 906 | } else { |
| 907 | tocopy = ext2fs_le16_to_cpu(eh->eh_entries) / 2; |
| 908 | } |
| 909 | |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 910 | #ifdef DEBUG |
| 911 | printf("will copy out %d of %d entries at level %d\n", |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 912 | tocopy, ext2fs_le16_to_cpu(eh->eh_entries), |
| 913 | handle->level); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 914 | #endif |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 915 | |
| 916 | if (!tocopy) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 917 | #ifdef DEBUG |
| 918 | printf("Nothing to copy to new block!\n"); |
| 919 | #endif |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 920 | retval = EXT2_ET_CANT_SPLIT_EXTENT; |
| 921 | goto done; |
| 922 | } |
| 923 | |
| 924 | /* first we need a new block, or can do nothing. */ |
| 925 | block_buf = malloc(handle->fs->blocksize); |
| 926 | if (!block_buf) { |
| 927 | retval = ENOMEM; |
| 928 | goto done; |
| 929 | } |
| 930 | |
| 931 | if (!goal_blk) { |
| 932 | dgrp_t group = ext2fs_group_of_ino(handle->fs, handle->ino); |
| 933 | __u8 log_flex = handle->fs->super->s_log_groups_per_flex; |
| 934 | |
| 935 | if (log_flex) |
| 936 | group = group & ~((1 << (log_flex)) - 1); |
Theodore Ts'o | 027b057 | 2013-01-03 13:42:38 -0500 | [diff] [blame] | 937 | goal_blk = ext2fs_group_first_block2(handle->fs, group); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 938 | } |
Valerie Aurora Henson | 6d8b37f | 2010-06-13 11:00:00 -0400 | [diff] [blame] | 939 | retval = ext2fs_alloc_block2(handle->fs, goal_blk, block_buf, |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 940 | &new_node_pblk); |
| 941 | if (retval) |
| 942 | goto done; |
| 943 | |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 944 | #ifdef DEBUG |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 945 | printf("will copy to new node at block %lu\n", |
| 946 | (unsigned long) new_node_pblk); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 947 | #endif |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 948 | |
| 949 | /* Copy data into new block buffer */ |
| 950 | /* First the header for the new block... */ |
| 951 | neweh = (struct ext3_extent_header *) block_buf; |
| 952 | memcpy(neweh, eh, sizeof(struct ext3_extent_header)); |
| 953 | neweh->eh_entries = ext2fs_cpu_to_le16(tocopy); |
| 954 | neweh->eh_max = ext2fs_cpu_to_le16((handle->fs->blocksize - |
| 955 | sizeof(struct ext3_extent_header)) / |
| 956 | sizeof(struct ext3_extent)); |
| 957 | |
| 958 | /* then the entries for the new block... */ |
| 959 | memcpy(EXT_FIRST_INDEX(neweh), |
| 960 | EXT_FIRST_INDEX(eh) + |
| 961 | (ext2fs_le16_to_cpu(eh->eh_entries) - tocopy), |
| 962 | sizeof(struct ext3_extent_idx) * tocopy); |
| 963 | |
| 964 | new_node_start = ext2fs_le32_to_cpu(EXT_FIRST_INDEX(neweh)->ei_block); |
| 965 | |
| 966 | /* ...and write the new node block out to disk. */ |
Valerie Aurora Henson | 24a117a | 2009-09-07 21:14:24 -0400 | [diff] [blame] | 967 | retval = io_channel_write_blk64(handle->fs->io, new_node_pblk, 1, |
| 968 | block_buf); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 969 | |
| 970 | if (retval) |
| 971 | goto done; |
| 972 | |
| 973 | /* OK! we've created the new node; now adjust the tree */ |
| 974 | |
| 975 | /* current path now has fewer active entries, we copied some out */ |
| 976 | if (handle->level == 0) { |
| 977 | memcpy(newpath, path, |
| 978 | sizeof(struct extent_path) * (handle->max_depth+1)); |
| 979 | handle->path = newpath; |
| 980 | newpath = path; |
| 981 | path = handle->path; |
| 982 | path->entries = 1; |
| 983 | path->left = path->max_entries - 1; |
| 984 | handle->max_depth++; |
| 985 | eh->eh_depth = ext2fs_cpu_to_le16(handle->max_depth); |
| 986 | } else { |
| 987 | path->entries -= tocopy; |
| 988 | path->left -= tocopy; |
| 989 | } |
| 990 | |
| 991 | eh->eh_entries = ext2fs_cpu_to_le16(path->entries); |
| 992 | /* this writes out the node, incl. the modified header */ |
| 993 | retval = update_path(handle); |
| 994 | if (retval) |
| 995 | goto done; |
| 996 | |
| 997 | /* now go up and insert/replace index for new node we created */ |
| 998 | if (new_root) { |
| 999 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_FIRST_SIB, &extent); |
| 1000 | if (retval) |
| 1001 | goto done; |
| 1002 | |
| 1003 | extent.e_lblk = new_node_start; |
| 1004 | extent.e_pblk = new_node_pblk; |
| 1005 | extent.e_len = handle->path[0].end_blk - extent.e_lblk; |
| 1006 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1007 | if (retval) |
| 1008 | goto done; |
| 1009 | } else { |
| 1010 | __u32 new_node_length; |
| 1011 | |
| 1012 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent); |
| 1013 | /* will insert after this one; it's length is shorter now */ |
| 1014 | new_node_length = new_node_start - extent.e_lblk; |
| 1015 | extent.e_len -= new_node_length; |
| 1016 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1017 | if (retval) |
| 1018 | goto done; |
| 1019 | |
| 1020 | /* now set up the new extent and insert it */ |
| 1021 | extent.e_lblk = new_node_start; |
| 1022 | extent.e_pblk = new_node_pblk; |
| 1023 | extent.e_len = new_node_length; |
| 1024 | retval = ext2fs_extent_insert(handle, EXT2_EXTENT_INSERT_AFTER, &extent); |
| 1025 | if (retval) |
| 1026 | goto done; |
| 1027 | } |
| 1028 | |
| 1029 | /* get handle back to our original position */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 1030 | retval = ext2fs_extent_goto2(handle, orig_height, orig_lblk); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 1031 | if (retval) |
| 1032 | goto done; |
| 1033 | |
| 1034 | /* new node hooked in, so update inode block count (do this here?) */ |
Aditya Kali | e0e2c7d | 2012-06-10 23:52:11 -0400 | [diff] [blame] | 1035 | handle->inode->i_blocks += (handle->fs->blocksize * |
| 1036 | EXT2FS_CLUSTER_RATIO(handle->fs)) / 512; |
Eric Sandeen | 125a367 | 2009-06-17 18:49:01 -0400 | [diff] [blame] | 1037 | retval = ext2fs_write_inode(handle->fs, handle->ino, |
| 1038 | handle->inode); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 1039 | if (retval) |
| 1040 | goto done; |
| 1041 | |
| 1042 | done: |
| 1043 | if (newpath) |
| 1044 | ext2fs_free_mem(&newpath); |
Jim Meyering | 45e338f | 2009-02-23 18:07:50 +0100 | [diff] [blame] | 1045 | free(block_buf); |
Eric Sandeen | 9fd6a96 | 2008-05-20 10:14:20 -0500 | [diff] [blame] | 1046 | |
| 1047 | return retval; |
| 1048 | } |
| 1049 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1050 | errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags, |
| 1051 | struct ext2fs_extent *extent) |
| 1052 | { |
| 1053 | struct extent_path *path; |
| 1054 | struct ext3_extent_idx *ix; |
| 1055 | struct ext3_extent_header *eh; |
| 1056 | errcode_t retval; |
| 1057 | |
| 1058 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 1059 | |
| 1060 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 1061 | return EXT2_ET_RO_FILSYS; |
| 1062 | |
| 1063 | if (!handle->path) |
| 1064 | return EXT2_ET_NO_CURRENT_NODE; |
| 1065 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 1066 | #ifdef DEBUG |
| 1067 | printf("extent insert: %u ", handle->ino); |
| 1068 | dbg_print_extent(0, extent); |
| 1069 | #endif |
| 1070 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1071 | path = handle->path + handle->level; |
| 1072 | |
Eric Sandeen | 01229db | 2008-05-20 10:15:27 -0500 | [diff] [blame] | 1073 | if (path->entries >= path->max_entries) { |
| 1074 | if (flags & EXT2_EXTENT_INSERT_NOSPLIT) { |
| 1075 | return EXT2_ET_CANT_INSERT_EXTENT; |
| 1076 | } else { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1077 | #ifdef DEBUG |
| 1078 | printf("node full (level %d) - splitting\n", |
Theodore Ts'o | 8895f43 | 2008-06-07 11:53:56 -0400 | [diff] [blame] | 1079 | handle->level); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1080 | #endif |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 1081 | retval = ext2fs_extent_node_split(handle); |
Eric Sandeen | 01229db | 2008-05-20 10:15:27 -0500 | [diff] [blame] | 1082 | if (retval) |
Eric Sandeen | 53422e8 | 2009-05-20 16:36:26 -0500 | [diff] [blame] | 1083 | return retval; |
Eric Sandeen | 01229db | 2008-05-20 10:15:27 -0500 | [diff] [blame] | 1084 | path = handle->path + handle->level; |
| 1085 | } |
| 1086 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1087 | |
| 1088 | eh = (struct ext3_extent_header *) path->buf; |
| 1089 | if (path->curr) { |
| 1090 | ix = path->curr; |
| 1091 | if (flags & EXT2_EXTENT_INSERT_AFTER) { |
| 1092 | ix++; |
| 1093 | path->left--; |
| 1094 | } |
| 1095 | } else |
| 1096 | ix = EXT_FIRST_INDEX(eh); |
| 1097 | |
| 1098 | path->curr = ix; |
| 1099 | |
Eric Sandeen | 5e057d5 | 2008-04-07 22:00:58 -0500 | [diff] [blame] | 1100 | if (path->left >= 0) |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1101 | memmove(ix + 1, ix, |
Theodore Ts'o | 252b736 | 2008-03-14 10:42:50 -0400 | [diff] [blame] | 1102 | (path->left+1) * sizeof(struct ext3_extent_idx)); |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1103 | path->left++; |
| 1104 | path->entries++; |
| 1105 | |
| 1106 | eh = (struct ext3_extent_header *) path->buf; |
| 1107 | eh->eh_entries = ext2fs_cpu_to_le16(path->entries); |
| 1108 | |
| 1109 | retval = ext2fs_extent_replace(handle, 0, extent); |
| 1110 | if (retval) |
| 1111 | goto errout; |
| 1112 | |
| 1113 | retval = update_path(handle); |
| 1114 | if (retval) |
| 1115 | goto errout; |
| 1116 | |
| 1117 | return 0; |
| 1118 | |
| 1119 | errout: |
| 1120 | ext2fs_extent_delete(handle, 0); |
| 1121 | return retval; |
| 1122 | } |
| 1123 | |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1124 | /* |
| 1125 | * Sets the physical block for a logical file block in the extent tree. |
| 1126 | * |
| 1127 | * May: map unmapped, unmap mapped, or remap mapped blocks. |
| 1128 | * |
| 1129 | * Mapping an unmapped block adds a single-block extent. |
| 1130 | * |
| 1131 | * Unmapping first or last block modifies extent in-place |
| 1132 | * - But may need to fix parent's starts too in first-block case |
| 1133 | * |
| 1134 | * Mapping any unmapped block requires adding a (single-block) extent |
| 1135 | * and inserting into proper point in tree. |
| 1136 | * |
| 1137 | * Modifying (unmapping or remapping) a block in the middle |
| 1138 | * of an extent requires splitting the extent. |
| 1139 | * - Remapping case requires new single-block extent. |
| 1140 | * |
| 1141 | * Remapping first or last block adds an extent. |
| 1142 | * |
| 1143 | * We really need extent adding to be smart about merging. |
| 1144 | */ |
| 1145 | |
| 1146 | errcode_t ext2fs_extent_set_bmap(ext2_extent_handle_t handle, |
| 1147 | blk64_t logical, blk64_t physical, int flags) |
| 1148 | { |
| 1149 | errcode_t ec, retval = 0; |
| 1150 | int mapped = 1; /* logical is mapped? */ |
| 1151 | int orig_height; |
| 1152 | int extent_uninit = 0; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1153 | int prev_uninit = 0; |
| 1154 | int next_uninit = 0; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1155 | int new_uninit = 0; |
| 1156 | int max_len = EXT_INIT_MAX_LEN; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1157 | int has_prev, has_next; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1158 | blk64_t orig_lblk; |
| 1159 | struct extent_path *path; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1160 | struct ext2fs_extent extent, next_extent, prev_extent; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1161 | struct ext2fs_extent newextent; |
| 1162 | struct ext2_extent_info info; |
| 1163 | |
| 1164 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 1165 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 1166 | #ifdef DEBUG |
| 1167 | printf("set_bmap ino %u log %lld phys %lld flags %d\n", |
| 1168 | handle->ino, logical, physical, flags); |
| 1169 | #endif |
| 1170 | |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1171 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 1172 | return EXT2_ET_RO_FILSYS; |
| 1173 | |
| 1174 | if (!handle->path) |
| 1175 | return EXT2_ET_NO_CURRENT_NODE; |
| 1176 | |
| 1177 | path = handle->path + handle->level; |
| 1178 | |
| 1179 | if (flags & EXT2_EXTENT_SET_BMAP_UNINIT) { |
| 1180 | new_uninit = 1; |
| 1181 | max_len = EXT_UNINIT_MAX_LEN; |
| 1182 | } |
| 1183 | |
| 1184 | /* if (re)mapping, set up new extent to insert */ |
| 1185 | if (physical) { |
| 1186 | newextent.e_len = 1; |
| 1187 | newextent.e_pblk = physical; |
| 1188 | newextent.e_lblk = logical; |
| 1189 | newextent.e_flags = EXT2_EXTENT_FLAGS_LEAF; |
| 1190 | if (new_uninit) |
| 1191 | newextent.e_flags |= EXT2_EXTENT_FLAGS_UNINIT; |
| 1192 | } |
| 1193 | |
| 1194 | /* special case if the extent tree is completely empty */ |
| 1195 | if ((handle->max_depth == 0) && (path->entries == 0)) { |
| 1196 | retval = ext2fs_extent_insert(handle, 0, &newextent); |
Theodore Ts'o | 8895f43 | 2008-06-07 11:53:56 -0400 | [diff] [blame] | 1197 | return retval; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | /* save our original location in the extent tree */ |
| 1201 | if ((retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, |
| 1202 | &extent))) { |
| 1203 | if (retval != EXT2_ET_NO_CURRENT_NODE) |
| 1204 | return retval; |
| 1205 | memset(&extent, 0, sizeof(extent)); |
| 1206 | } |
| 1207 | if ((retval = ext2fs_extent_get_info(handle, &info))) |
| 1208 | return retval; |
| 1209 | orig_height = info.max_depth - info.curr_level; |
| 1210 | orig_lblk = extent.e_lblk; |
| 1211 | |
| 1212 | /* go to the logical spot we want to (re/un)map */ |
| 1213 | retval = ext2fs_extent_goto(handle, logical); |
| 1214 | if (retval) { |
| 1215 | if (retval == EXT2_ET_EXTENT_NOT_FOUND) { |
| 1216 | retval = 0; |
| 1217 | mapped = 0; |
| 1218 | if (!physical) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1219 | #ifdef DEBUG |
| 1220 | printf("block %llu already unmapped\n", |
Theodore Ts'o | 8895f43 | 2008-06-07 11:53:56 -0400 | [diff] [blame] | 1221 | logical); |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1222 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1223 | goto done; |
| 1224 | } |
| 1225 | } else |
| 1226 | goto done; |
| 1227 | } |
| 1228 | |
| 1229 | /* |
| 1230 | * This may be the extent *before* the requested logical, |
| 1231 | * if it's currently unmapped. |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1232 | * |
| 1233 | * Get the previous and next leaf extents, if they are present. |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1234 | */ |
| 1235 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent); |
| 1236 | if (retval) |
| 1237 | goto done; |
| 1238 | if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT) |
| 1239 | extent_uninit = 1; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1240 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_LEAF, &next_extent); |
| 1241 | if (retval) { |
| 1242 | has_next = 0; |
| 1243 | if (retval != EXT2_ET_EXTENT_NO_NEXT) |
| 1244 | goto done; |
| 1245 | } else { |
| 1246 | dbg_print_extent("set_bmap: next_extent", |
| 1247 | &next_extent); |
| 1248 | has_next = 1; |
| 1249 | if (next_extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT) |
| 1250 | next_uninit = 1; |
| 1251 | } |
| 1252 | retval = ext2fs_extent_goto(handle, logical); |
| 1253 | if (retval && retval != EXT2_ET_EXTENT_NOT_FOUND) |
| 1254 | goto done; |
| 1255 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_PREV_LEAF, &prev_extent); |
| 1256 | if (retval) { |
| 1257 | has_prev = 0; |
| 1258 | if (retval != EXT2_ET_EXTENT_NO_PREV) |
| 1259 | goto done; |
| 1260 | } else { |
| 1261 | has_prev = 1; |
| 1262 | dbg_print_extent("set_bmap: prev_extent", |
| 1263 | &prev_extent); |
| 1264 | if (prev_extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT) |
| 1265 | prev_uninit = 1; |
| 1266 | } |
| 1267 | retval = ext2fs_extent_goto(handle, logical); |
| 1268 | if (retval && retval != EXT2_ET_EXTENT_NOT_FOUND) |
| 1269 | goto done; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1270 | |
| 1271 | /* check if already pointing to the requested physical */ |
| 1272 | if (mapped && (new_uninit == extent_uninit) && |
| 1273 | (extent.e_pblk + (logical - extent.e_lblk) == physical)) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1274 | #ifdef DEBUG |
| 1275 | printf("physical block (at %llu) unchanged\n", logical); |
| 1276 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1277 | goto done; |
| 1278 | } |
| 1279 | |
| 1280 | if (!mapped) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1281 | #ifdef DEBUG |
| 1282 | printf("mapping unmapped logical block %llu\n", logical); |
| 1283 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1284 | if ((logical == extent.e_lblk + extent.e_len) && |
| 1285 | (physical == extent.e_pblk + extent.e_len) && |
| 1286 | (new_uninit == extent_uninit) && |
Theodore Ts'o | 8895f43 | 2008-06-07 11:53:56 -0400 | [diff] [blame] | 1287 | ((int) extent.e_len < max_len-1)) { |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1288 | extent.e_len++; |
| 1289 | retval = ext2fs_extent_replace(handle, 0, &extent); |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1290 | } else if ((logical == extent.e_lblk - 1) && |
| 1291 | (physical == extent.e_pblk - 1) && |
| 1292 | (new_uninit == extent_uninit) && |
| 1293 | ((int) extent.e_len < max_len - 1)) { |
| 1294 | extent.e_len++; |
| 1295 | extent.e_lblk--; |
| 1296 | extent.e_pblk--; |
| 1297 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1298 | } else if (has_next && |
| 1299 | (logical == next_extent.e_lblk - 1) && |
| 1300 | (physical == next_extent.e_pblk - 1) && |
| 1301 | (new_uninit == next_uninit) && |
| 1302 | ((int) next_extent.e_len < max_len - 1)) { |
| 1303 | retval = ext2fs_extent_get(handle, |
| 1304 | EXT2_EXTENT_NEXT_LEAF, |
| 1305 | &next_extent); |
| 1306 | if (retval) |
| 1307 | goto done; |
| 1308 | next_extent.e_len++; |
| 1309 | next_extent.e_lblk--; |
| 1310 | next_extent.e_pblk--; |
| 1311 | retval = ext2fs_extent_replace(handle, 0, &next_extent); |
Theodore Ts'o | a9ea728 | 2008-08-22 02:32:28 -0400 | [diff] [blame] | 1312 | } else if (logical < extent.e_lblk) |
| 1313 | retval = ext2fs_extent_insert(handle, 0, &newextent); |
| 1314 | else |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1315 | retval = ext2fs_extent_insert(handle, |
| 1316 | EXT2_EXTENT_INSERT_AFTER, &newextent); |
| 1317 | if (retval) |
| 1318 | goto done; |
| 1319 | retval = ext2fs_extent_fix_parents(handle); |
| 1320 | if (retval) |
| 1321 | goto done; |
| 1322 | } else if ((logical == extent.e_lblk) && (extent.e_len == 1)) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1323 | #ifdef DEBUG |
| 1324 | printf("(re/un)mapping only block in extent\n"); |
| 1325 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1326 | if (physical) { |
Theodore Ts'o | 2047e0a | 2008-08-22 02:39:46 -0400 | [diff] [blame] | 1327 | retval = ext2fs_extent_replace(handle, 0, &newextent); |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1328 | } else { |
| 1329 | retval = ext2fs_extent_delete(handle, 0); |
| 1330 | if (retval) |
| 1331 | goto done; |
| 1332 | ec = ext2fs_extent_fix_parents(handle); |
| 1333 | if (ec != EXT2_ET_NO_CURRENT_NODE) |
| 1334 | retval = ec; |
| 1335 | } |
| 1336 | |
| 1337 | if (retval) |
| 1338 | goto done; |
| 1339 | } else if (logical == extent.e_lblk + extent.e_len - 1) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1340 | #ifdef DEBUG |
| 1341 | printf("(re/un)mapping last block in extent\n"); |
| 1342 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1343 | if (physical) { |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1344 | if (has_next && |
| 1345 | (logical == (next_extent.e_lblk - 1)) && |
| 1346 | (physical == (next_extent.e_pblk - 1)) && |
| 1347 | (new_uninit == next_uninit) && |
| 1348 | ((int) next_extent.e_len < max_len - 1)) { |
| 1349 | retval = ext2fs_extent_get(handle, |
| 1350 | EXT2_EXTENT_NEXT_LEAF, &next_extent); |
| 1351 | if (retval) |
| 1352 | goto done; |
| 1353 | next_extent.e_len++; |
| 1354 | next_extent.e_lblk--; |
| 1355 | next_extent.e_pblk--; |
| 1356 | retval = ext2fs_extent_replace(handle, 0, |
| 1357 | &next_extent); |
| 1358 | if (retval) |
| 1359 | goto done; |
Eric Sandeen | a88c2fb | 2013-09-09 10:47:21 -0400 | [diff] [blame] | 1360 | retval = ext2fs_extent_fix_parents(handle); |
| 1361 | if (retval) |
| 1362 | goto done; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1363 | } else |
| 1364 | retval = ext2fs_extent_insert(handle, |
| 1365 | EXT2_EXTENT_INSERT_AFTER, &newextent); |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1366 | if (retval) |
| 1367 | goto done; |
Eric Sandeen | 4bd87f2 | 2009-07-07 14:30:32 -0500 | [diff] [blame] | 1368 | /* Now pointing at inserted extent; move back to prev */ |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1369 | retval = ext2fs_extent_get(handle, |
| 1370 | EXT2_EXTENT_PREV_LEAF, |
| 1371 | &extent); |
Eric Sandeen | 4bd87f2 | 2009-07-07 14:30:32 -0500 | [diff] [blame] | 1372 | if (retval) |
| 1373 | goto done; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1374 | } |
Eric Sandeen | 53422e8 | 2009-05-20 16:36:26 -0500 | [diff] [blame] | 1375 | extent.e_len--; |
| 1376 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1377 | if (retval) |
| 1378 | goto done; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1379 | } else if (logical == extent.e_lblk) { |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1380 | #ifdef DEBUG |
| 1381 | printf("(re/un)mapping first block in extent\n"); |
| 1382 | #endif |
Theodore Ts'o | 0dc2916 | 2009-07-10 00:19:28 -0400 | [diff] [blame] | 1383 | if (physical) { |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1384 | if (has_prev && |
| 1385 | (logical == (prev_extent.e_lblk + |
| 1386 | prev_extent.e_len)) && |
| 1387 | (physical == (prev_extent.e_pblk + |
| 1388 | prev_extent.e_len)) && |
| 1389 | (new_uninit == prev_uninit) && |
| 1390 | ((int) prev_extent.e_len < max_len-1)) { |
| 1391 | retval = ext2fs_extent_get(handle, |
| 1392 | EXT2_EXTENT_PREV_LEAF, &prev_extent); |
Theodore Ts'o | 0dc2916 | 2009-07-10 00:19:28 -0400 | [diff] [blame] | 1393 | if (retval) |
| 1394 | goto done; |
Theodore Ts'o | 8b5ed49 | 2009-07-19 23:37:44 -0400 | [diff] [blame] | 1395 | prev_extent.e_len++; |
| 1396 | retval = ext2fs_extent_replace(handle, 0, |
| 1397 | &prev_extent); |
| 1398 | } else |
Theodore Ts'o | 0dc2916 | 2009-07-10 00:19:28 -0400 | [diff] [blame] | 1399 | retval = ext2fs_extent_insert(handle, |
| 1400 | 0, &newextent); |
Theodore Ts'o | 0dc2916 | 2009-07-10 00:19:28 -0400 | [diff] [blame] | 1401 | if (retval) |
| 1402 | goto done; |
Theodore Ts'o | 16e470e | 2009-07-19 22:43:33 -0400 | [diff] [blame] | 1403 | retval = ext2fs_extent_get(handle, |
| 1404 | EXT2_EXTENT_NEXT_LEAF, |
| 1405 | &extent); |
| 1406 | if (retval) |
| 1407 | goto done; |
Theodore Ts'o | 0dc2916 | 2009-07-10 00:19:28 -0400 | [diff] [blame] | 1408 | } |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1409 | extent.e_pblk++; |
| 1410 | extent.e_lblk++; |
| 1411 | extent.e_len--; |
| 1412 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1413 | if (retval) |
| 1414 | goto done; |
Eric Sandeen | a88c2fb | 2013-09-09 10:47:21 -0400 | [diff] [blame] | 1415 | retval = ext2fs_extent_fix_parents(handle); |
| 1416 | if (retval) |
| 1417 | goto done; |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1418 | } else { |
| 1419 | __u32 orig_length; |
| 1420 | |
Theodore Ts'o | 5a299b5 | 2008-07-13 14:19:14 -0400 | [diff] [blame] | 1421 | #ifdef DEBUG |
| 1422 | printf("(re/un)mapping in middle of extent\n"); |
| 1423 | #endif |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1424 | /* need to split this extent; later */ |
| 1425 | |
| 1426 | orig_length = extent.e_len; |
| 1427 | |
| 1428 | /* shorten pre-split extent */ |
| 1429 | extent.e_len = (logical - extent.e_lblk); |
| 1430 | retval = ext2fs_extent_replace(handle, 0, &extent); |
| 1431 | if (retval) |
| 1432 | goto done; |
| 1433 | /* insert our new extent, if any */ |
| 1434 | if (physical) { |
| 1435 | /* insert new extent after current */ |
| 1436 | retval = ext2fs_extent_insert(handle, |
| 1437 | EXT2_EXTENT_INSERT_AFTER, &newextent); |
| 1438 | if (retval) |
| 1439 | goto done; |
| 1440 | } |
| 1441 | /* add post-split extent */ |
| 1442 | extent.e_pblk += extent.e_len + 1; |
| 1443 | extent.e_lblk += extent.e_len + 1; |
| 1444 | extent.e_len = orig_length - extent.e_len - 1; |
| 1445 | retval = ext2fs_extent_insert(handle, |
| 1446 | EXT2_EXTENT_INSERT_AFTER, &extent); |
| 1447 | if (retval) |
| 1448 | goto done; |
| 1449 | } |
| 1450 | |
| 1451 | done: |
| 1452 | /* get handle back to its position */ |
| 1453 | if (orig_height > handle->max_depth) |
| 1454 | orig_height = handle->max_depth; /* In case we shortened the tree */ |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 1455 | ext2fs_extent_goto2(handle, orig_height, orig_lblk); |
Eric Sandeen | f4e9963 | 2008-05-20 10:17:46 -0500 | [diff] [blame] | 1456 | return retval; |
| 1457 | } |
| 1458 | |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1459 | errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle, int flags) |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1460 | { |
| 1461 | struct extent_path *path; |
| 1462 | char *cp; |
| 1463 | struct ext3_extent_header *eh; |
Theodore Ts'o | 8895f43 | 2008-06-07 11:53:56 -0400 | [diff] [blame] | 1464 | errcode_t retval = 0; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1465 | |
| 1466 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 1467 | |
| 1468 | if (!(handle->fs->flags & EXT2_FLAG_RW)) |
| 1469 | return EXT2_ET_RO_FILSYS; |
| 1470 | |
| 1471 | if (!handle->path) |
| 1472 | return EXT2_ET_NO_CURRENT_NODE; |
| 1473 | |
Theodore Ts'o | 64cb68b | 2009-07-19 23:32:09 -0400 | [diff] [blame] | 1474 | #ifdef DEBUG |
| 1475 | { |
| 1476 | struct ext2fs_extent extent; |
| 1477 | |
| 1478 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, |
| 1479 | &extent); |
| 1480 | if (retval == 0) { |
| 1481 | printf("extent delete %u ", handle->ino); |
| 1482 | dbg_print_extent(0, &extent); |
| 1483 | } |
| 1484 | } |
| 1485 | #endif |
| 1486 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1487 | path = handle->path + handle->level; |
| 1488 | if (!path->curr) |
| 1489 | return EXT2_ET_NO_CURRENT_NODE; |
| 1490 | |
| 1491 | cp = path->curr; |
| 1492 | |
| 1493 | if (path->left) { |
| 1494 | memmove(cp, cp + sizeof(struct ext3_extent_idx), |
| 1495 | path->left * sizeof(struct ext3_extent_idx)); |
| 1496 | path->left--; |
Theodore Ts'o | 83d9be1 | 2008-03-13 23:55:40 -0400 | [diff] [blame] | 1497 | } else { |
| 1498 | struct ext3_extent_idx *ix = path->curr; |
| 1499 | ix--; |
| 1500 | path->curr = ix; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1501 | } |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1502 | if (--path->entries == 0) |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1503 | path->curr = 0; |
| 1504 | |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1505 | /* if non-root node has no entries left, remove it & parent ptr to it */ |
| 1506 | if (path->entries == 0 && handle->level) { |
| 1507 | if (!(flags & EXT2_EXTENT_DELETE_KEEP_EMPTY)) { |
| 1508 | struct ext2fs_extent extent; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1509 | |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1510 | retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, |
| 1511 | &extent); |
| 1512 | if (retval) |
| 1513 | return retval; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1514 | |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1515 | retval = ext2fs_extent_delete(handle, flags); |
Aditya Kali | e0e2c7d | 2012-06-10 23:52:11 -0400 | [diff] [blame] | 1516 | handle->inode->i_blocks -= |
| 1517 | (handle->fs->blocksize * |
| 1518 | EXT2FS_CLUSTER_RATIO(handle->fs)) / 512; |
Eric Sandeen | 125a367 | 2009-06-17 18:49:01 -0400 | [diff] [blame] | 1519 | retval = ext2fs_write_inode(handle->fs, handle->ino, |
| 1520 | handle->inode); |
Valerie Aurora Henson | 48f2305 | 2009-10-25 21:46:58 -0400 | [diff] [blame] | 1521 | ext2fs_block_alloc_stats2(handle->fs, |
| 1522 | extent.e_pblk, -1); |
Eric Sandeen | c802ad9 | 2008-05-20 16:13:41 -0500 | [diff] [blame] | 1523 | } |
| 1524 | } else { |
| 1525 | eh = (struct ext3_extent_header *) path->buf; |
| 1526 | eh->eh_entries = ext2fs_cpu_to_le16(path->entries); |
| 1527 | if ((path->entries == 0) && (handle->level == 0)) |
| 1528 | eh->eh_depth = handle->max_depth = 0; |
| 1529 | retval = update_path(handle); |
| 1530 | } |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1531 | return retval; |
| 1532 | } |
| 1533 | |
| 1534 | errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle, |
| 1535 | struct ext2_extent_info *info) |
| 1536 | { |
| 1537 | struct extent_path *path; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1538 | |
| 1539 | EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); |
| 1540 | |
| 1541 | memset(info, 0, sizeof(struct ext2_extent_info)); |
| 1542 | |
| 1543 | path = handle->path + handle->level; |
| 1544 | if (path) { |
| 1545 | if (path->curr) |
| 1546 | info->curr_entry = ((char *) path->curr - path->buf) / |
| 1547 | sizeof(struct ext3_extent_idx); |
| 1548 | else |
| 1549 | info->curr_entry = 0; |
| 1550 | info->num_entries = path->entries; |
| 1551 | info->max_entries = path->max_entries; |
| 1552 | info->bytes_avail = (path->max_entries - path->entries) * |
| 1553 | sizeof(struct ext3_extent); |
| 1554 | } |
| 1555 | |
| 1556 | info->curr_level = handle->level; |
| 1557 | info->max_depth = handle->max_depth; |
| 1558 | info->max_lblk = ((__u64) 1 << 32) - 1; |
| 1559 | info->max_pblk = ((__u64) 1 << 48) - 1; |
| 1560 | info->max_len = (1UL << 15); |
| 1561 | info->max_uninit_len = (1UL << 15) - 1; |
| 1562 | |
| 1563 | return 0; |
| 1564 | } |
| 1565 | |
| 1566 | #ifdef DEBUG |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1567 | /* |
Theodore Ts'o | bee7b67 | 2012-12-22 18:50:33 -0500 | [diff] [blame] | 1568 | * Override debugfs's prompt |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1569 | */ |
Theodore Ts'o | 2d328bb | 2008-03-17 23:17:13 -0400 | [diff] [blame] | 1570 | const char *debug_prog_name = "tst_extents"; |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1571 | |
Theodore Ts'o | 3eb07f6 | 2007-10-14 23:04:58 -0400 | [diff] [blame] | 1572 | #endif |
| 1573 | |