2 * closefs.c --- close an ext2 filesystem
4 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
23 static int test_root(int a, int b)
36 int ext2fs_bg_has_super(ext2_filsys fs, int group_block)
38 if (!(fs->super->s_feature_ro_compat &
39 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
42 if (test_root(group_block, 3) || (test_root(group_block, 5)) ||
43 test_root(group_block, 7))
50 * ext2fs_super_and_bgd_loc2()
51 * @fs: ext2 fs pointer
52 * @group given block group
53 * @ret_super_blk: if !NULL, returns super block location
54 * @ret_old_desc_blk: if !NULL, returns location of the old block
56 * @ret_new_desc_blk: if !NULL, returns location of meta_bg block
58 * @ret_used_blks: if !NULL, returns number of blocks used by
59 * super block and group_descriptors.
61 * Returns errcode_t of 0
63 errcode_t ext2fs_super_and_bgd_loc2(ext2_filsys fs,
65 blk64_t *ret_super_blk,
66 blk64_t *ret_old_desc_blk,
67 blk64_t *ret_new_desc_blk,
70 blk64_t group_block, super_blk = 0, old_desc_blk = 0, new_desc_blk = 0;
71 unsigned int meta_bg, meta_bg_size;
73 blk64_t old_desc_blocks;
76 group_block = ext2fs_group_first_block2(fs, group);
77 if (group_block == 0 && fs->blocksize == 1024)
78 group_block = 1; /* Deal with 1024 blocksize && bigalloc */
80 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
81 old_desc_blocks = fs->super->s_first_meta_bg;
84 fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
86 has_super = ext2fs_bg_has_super(fs, group);
89 super_blk = group_block;
92 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
93 meta_bg = group / meta_bg_size;
95 if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
96 (meta_bg < fs->super->s_first_meta_bg)) {
98 old_desc_blk = group_block + 1;
99 numblocks += old_desc_blocks;
102 if (((group % meta_bg_size) == 0) ||
103 ((group % meta_bg_size) == 1) ||
104 ((group % meta_bg_size) == (meta_bg_size-1))) {
107 new_desc_blk = group_block + has_super;
113 *ret_super_blk = super_blk;
114 if (ret_old_desc_blk)
115 *ret_old_desc_blk = old_desc_blk;
116 if (ret_new_desc_blk)
117 *ret_new_desc_blk = new_desc_blk;
119 *ret_used_blks = numblocks;
125 * This function returns the location of the superblock, block group
126 * descriptors for a given block group. It currently returns the
127 * number of free blocks assuming that inode table and allocation
128 * bitmaps will be in the group. This is not necessarily the case
129 * when the flex_bg feature is enabled, so callers should take care!
130 * It was only really intended for use by mke2fs, and even there it's
133 * The ext2fs_super_and_bgd_loc2() function is 64-bit block number
134 * capable and returns the number of blocks used by super block and
137 int ext2fs_super_and_bgd_loc(ext2_filsys fs,
139 blk_t *ret_super_blk,
140 blk_t *ret_old_desc_blk,
141 blk_t *ret_new_desc_blk,
144 blk64_t ret_super_blk2;
145 blk64_t ret_old_desc_blk2;
146 blk64_t ret_new_desc_blk2;
149 unsigned int meta_bg_size;
151 ext2fs_super_and_bgd_loc2(fs, group, &ret_super_blk2,
156 numblocks = ext2fs_group_blocks_count(fs, group);
159 *ret_super_blk = (blk_t)ret_super_blk2;
160 if (ret_old_desc_blk)
161 *ret_old_desc_blk = (blk_t)ret_old_desc_blk2;
162 if (ret_new_desc_blk)
163 *ret_new_desc_blk = (blk_t)ret_new_desc_blk2;
165 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
166 *ret_meta_bg = group / meta_bg_size;
169 numblocks -= 2 + fs->inode_blocks_per_group + ret_used_blks;
175 * This function forces out the primary superblock. We need to only
176 * write out those fields which we have changed, since if the
177 * filesystem is mounted, it may have changed some of the other
180 * It takes as input a superblock which has already been byte swapped
184 static errcode_t write_primary_superblock(ext2_filsys fs,
185 struct ext2_super_block *super)
187 __u16 *old_super, *new_super;
188 int check_idx, write_idx, size;
191 if (!fs->io->manager->write_byte || !fs->orig_super) {
193 io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
194 retval = io_channel_write_blk64(fs->io, 1, -SUPERBLOCK_SIZE,
196 io_channel_set_blksize(fs->io, fs->blocksize);
200 old_super = (__u16 *) fs->orig_super;
201 new_super = (__u16 *) super;
203 for (check_idx = 0; check_idx < SUPERBLOCK_SIZE/2; check_idx++) {
204 if (old_super[check_idx] == new_super[check_idx])
206 write_idx = check_idx;
207 for (check_idx++; check_idx < SUPERBLOCK_SIZE/2; check_idx++)
208 if (old_super[check_idx] == new_super[check_idx])
210 size = 2 * (check_idx - write_idx);
212 printf("Writing %d bytes starting at %d\n",
215 retval = io_channel_write_byte(fs->io,
216 SUPERBLOCK_OFFSET + (2 * write_idx), size,
217 new_super + write_idx);
218 if (retval == EXT2_ET_UNIMPLEMENTED)
223 memcpy(fs->orig_super, super, SUPERBLOCK_SIZE);
229 * Updates the revision to EXT2_DYNAMIC_REV
231 void ext2fs_update_dynamic_rev(ext2_filsys fs)
233 struct ext2_super_block *sb = fs->super;
235 if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
238 sb->s_rev_level = EXT2_DYNAMIC_REV;
239 sb->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
240 sb->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
241 /* s_uuid is handled by e2fsck already */
242 /* other fields should be left alone */
245 static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group,
247 struct ext2_super_block *super_shadow)
251 if (sgrp > ((1 << 16) - 1))
252 sgrp = (1 << 16) - 1;
253 #ifdef WORDS_BIGENDIAN
254 super_shadow->s_block_group_nr = ext2fs_swab16(sgrp);
256 fs->super->s_block_group_nr = sgrp;
259 return io_channel_write_blk64(fs->io, group_block, -SUPERBLOCK_SIZE,
263 errcode_t ext2fs_flush(ext2_filsys fs)
265 return ext2fs_flush2(fs, 0);
268 errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
272 unsigned long fs_state;
273 __u32 feature_incompat;
274 struct ext2_super_block *super_shadow = 0;
275 struct ext2_group_desc *group_shadow = 0;
276 #ifdef WORDS_BIGENDIAN
277 struct ext2_group_desc *gdp;
282 struct ext2fs_numeric_progress_struct progress;
284 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
286 fs_state = fs->super->s_state;
287 feature_incompat = fs->super->s_feature_incompat;
289 fs->super->s_wtime = fs->now ? fs->now : time(NULL);
290 fs->super->s_block_group_nr = 0;
291 #ifdef WORDS_BIGENDIAN
292 retval = EXT2_ET_NO_MEMORY;
293 retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
296 retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
300 memcpy(group_shadow, fs->group_desc, (size_t) fs->blocksize *
303 /* swap the group descriptors */
304 for (j=0; j < fs->group_desc_count; j++) {
305 gdp = ext2fs_group_desc(fs, group_shadow, j);
306 ext2fs_swap_group_desc2(fs, gdp);
309 super_shadow = fs->super;
310 group_shadow = ext2fs_group_desc(fs, fs->group_desc, 0);
314 * Set the state of the FS to be non-valid. (The state has
315 * already been backed up earlier, and will be restored after
316 * we write out the backup superblocks.)
318 fs->super->s_state &= ~EXT2_VALID_FS;
319 fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
320 #ifdef WORDS_BIGENDIAN
321 *super_shadow = *fs->super;
322 ext2fs_swap_super(super_shadow);
326 * If this is an external journal device, don't write out the
327 * block group descriptors or any of the backup superblocks
329 if (fs->super->s_feature_incompat &
330 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
331 goto write_primary_superblock_only;
334 * Write out the master group descriptors, and the backup
335 * superblocks and group descriptors.
337 group_ptr = (char *) group_shadow;
338 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
339 old_desc_blocks = fs->super->s_first_meta_bg;
341 old_desc_blocks = fs->desc_blocks;
343 ext2fs_numeric_progress_init(fs, &progress, NULL,
344 fs->group_desc_count);
347 for (i = 0; i < fs->group_desc_count; i++) {
348 blk64_t super_blk, old_desc_blk, new_desc_blk;
350 ext2fs_numeric_progress_update(fs, &progress, i);
351 ext2fs_super_and_bgd_loc2(fs, i, &super_blk, &old_desc_blk,
354 if (!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) &&i && super_blk) {
355 retval = write_backup_super(fs, i, super_blk,
360 if (fs->flags & EXT2_FLAG_SUPER_ONLY)
362 if ((old_desc_blk) &&
363 (!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) || (i == 0))) {
364 retval = io_channel_write_blk64(fs->io,
365 old_desc_blk, old_desc_blocks, group_ptr);
370 int meta_bg = i / EXT2_DESC_PER_BLOCK(fs->super);
372 retval = io_channel_write_blk64(fs->io, new_desc_blk,
373 1, group_ptr + (meta_bg*fs->blocksize));
379 ext2fs_numeric_progress_close(fs, &progress, NULL);
382 * If the write_bitmaps() function is present, call it to
383 * flush the bitmaps. This is done this way so that a simple
384 * program that doesn't mess with the bitmaps doesn't need to
385 * drag in the bitmaps.c code.
387 if (fs->write_bitmaps) {
388 retval = fs->write_bitmaps(fs);
393 write_primary_superblock_only:
395 * Write out master superblock. This has to be done
396 * separately, since it is located at a fixed location
397 * (SUPERBLOCK_OFFSET). We flush all other pending changes
398 * out to disk first, just to avoid a race condition with an
399 * insy-tinsy window....
402 fs->super->s_block_group_nr = 0;
403 fs->super->s_state = fs_state;
404 fs->super->s_feature_incompat = feature_incompat;
405 #ifdef WORDS_BIGENDIAN
406 *super_shadow = *fs->super;
407 ext2fs_swap_super(super_shadow);
410 if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC))
411 retval = io_channel_flush(fs->io);
412 retval = write_primary_superblock(fs, super_shadow);
416 fs->flags &= ~EXT2_FLAG_DIRTY;
418 if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC))
419 retval = io_channel_flush(fs->io);
421 fs->super->s_state = fs_state;
422 #ifdef WORDS_BIGENDIAN
424 ext2fs_free_mem(&super_shadow);
426 ext2fs_free_mem(&group_shadow);
431 errcode_t ext2fs_close(ext2_filsys fs)
433 return ext2fs_close2(fs, 0);
436 errcode_t ext2fs_close2(ext2_filsys fs, int flags)
442 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
444 if (fs->write_bitmaps) {
445 retval = fs->write_bitmaps(fs);
449 if (fs->super->s_kbytes_written &&
450 fs->io->manager->get_stats)
451 fs->io->manager->get_stats(fs->io, &stats);
452 if (stats && stats->bytes_written && (fs->flags & EXT2_FLAG_RW)) {
453 fs->super->s_kbytes_written += stats->bytes_written >> 10;
454 meta_blks = fs->desc_blocks + 1;
455 if (!(fs->flags & EXT2_FLAG_SUPER_ONLY))
456 fs->super->s_kbytes_written += meta_blks /
457 (fs->blocksize / 1024);
458 if ((fs->flags & EXT2_FLAG_DIRTY) == 0)
459 fs->flags |= EXT2_FLAG_SUPER_ONLY | EXT2_FLAG_DIRTY;
461 if (fs->flags & EXT2_FLAG_DIRTY) {
462 retval = ext2fs_flush2(fs, flags);