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(unsigned int a, unsigned int b)
36 int ext2fs_bg_has_super(ext2_filsys fs, dgrp_t group)
40 if (fs->super->s_feature_compat & EXT4_FEATURE_COMPAT_SPARSE_SUPER2) {
41 if (group == fs->super->s_backup_bgs[0] ||
42 group == fs->super->s_backup_bgs[1])
46 if ((group <= 1) || !(fs->super->s_feature_ro_compat &
47 EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
51 if (test_root(group, 3) || (test_root(group, 5)) ||
59 * ext2fs_super_and_bgd_loc2()
60 * @fs: ext2 fs pointer
61 * @group given block group
62 * @ret_super_blk: if !NULL, returns super block location
63 * @ret_old_desc_blk: if !NULL, returns location of the old block
65 * @ret_new_desc_blk: if !NULL, returns location of meta_bg block
67 * @ret_used_blks: if !NULL, returns number of blocks used by
68 * super block and group_descriptors.
70 * Returns errcode_t of 0
72 errcode_t ext2fs_super_and_bgd_loc2(ext2_filsys fs,
74 blk64_t *ret_super_blk,
75 blk64_t *ret_old_desc_blk,
76 blk64_t *ret_new_desc_blk,
79 blk64_t group_block, super_blk = 0, old_desc_blk = 0, new_desc_blk = 0;
80 unsigned int meta_bg, meta_bg_size;
82 blk64_t old_desc_blocks;
85 group_block = ext2fs_group_first_block2(fs, group);
86 if (group_block == 0 && fs->blocksize == 1024)
87 group_block = 1; /* Deal with 1024 blocksize && bigalloc */
89 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
90 old_desc_blocks = fs->super->s_first_meta_bg;
93 fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
95 has_super = ext2fs_bg_has_super(fs, group);
98 super_blk = group_block;
101 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
102 meta_bg = group / meta_bg_size;
104 if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
105 (meta_bg < fs->super->s_first_meta_bg)) {
107 old_desc_blk = group_block + 1;
108 numblocks += old_desc_blocks;
111 if (((group % meta_bg_size) == 0) ||
112 ((group % meta_bg_size) == 1) ||
113 ((group % meta_bg_size) == (meta_bg_size-1))) {
116 new_desc_blk = group_block + has_super;
122 *ret_super_blk = super_blk;
123 if (ret_old_desc_blk)
124 *ret_old_desc_blk = old_desc_blk;
125 if (ret_new_desc_blk)
126 *ret_new_desc_blk = new_desc_blk;
128 *ret_used_blks = numblocks;
134 * This function returns the location of the superblock, block group
135 * descriptors for a given block group. It currently returns the
136 * number of free blocks assuming that inode table and allocation
137 * bitmaps will be in the group. This is not necessarily the case
138 * when the flex_bg feature is enabled, so callers should take care!
139 * It was only really intended for use by mke2fs, and even there it's
142 * The ext2fs_super_and_bgd_loc2() function is 64-bit block number
143 * capable and returns the number of blocks used by super block and
146 int ext2fs_super_and_bgd_loc(ext2_filsys fs,
148 blk_t *ret_super_blk,
149 blk_t *ret_old_desc_blk,
150 blk_t *ret_new_desc_blk,
153 blk64_t ret_super_blk2;
154 blk64_t ret_old_desc_blk2;
155 blk64_t ret_new_desc_blk2;
158 unsigned int meta_bg_size;
160 ext2fs_super_and_bgd_loc2(fs, group, &ret_super_blk2,
165 numblocks = ext2fs_group_blocks_count(fs, group);
168 *ret_super_blk = (blk_t)ret_super_blk2;
169 if (ret_old_desc_blk)
170 *ret_old_desc_blk = (blk_t)ret_old_desc_blk2;
171 if (ret_new_desc_blk)
172 *ret_new_desc_blk = (blk_t)ret_new_desc_blk2;
174 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
175 *ret_meta_bg = group / meta_bg_size;
178 numblocks -= 2 + fs->inode_blocks_per_group + ret_used_blks;
184 * This function forces out the primary superblock. We need to only
185 * write out those fields which we have changed, since if the
186 * filesystem is mounted, it may have changed some of the other
189 * It takes as input a superblock which has already been byte swapped
193 static errcode_t write_primary_superblock(ext2_filsys fs,
194 struct ext2_super_block *super)
196 __u16 *old_super, *new_super;
197 int check_idx, write_idx, size;
200 if (!fs->io->manager->write_byte || !fs->orig_super) {
202 io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
203 retval = io_channel_write_blk64(fs->io, 1, -SUPERBLOCK_SIZE,
205 io_channel_set_blksize(fs->io, fs->blocksize);
209 old_super = (__u16 *) fs->orig_super;
210 new_super = (__u16 *) super;
212 for (check_idx = 0; check_idx < SUPERBLOCK_SIZE/2; check_idx++) {
213 if (old_super[check_idx] == new_super[check_idx])
215 write_idx = check_idx;
216 for (check_idx++; check_idx < SUPERBLOCK_SIZE/2; check_idx++)
217 if (old_super[check_idx] == new_super[check_idx])
219 size = 2 * (check_idx - write_idx);
221 printf("Writing %d bytes starting at %d\n",
224 retval = io_channel_write_byte(fs->io,
225 SUPERBLOCK_OFFSET + (2 * write_idx), size,
226 new_super + write_idx);
227 if (retval == EXT2_ET_UNIMPLEMENTED)
232 memcpy(fs->orig_super, super, SUPERBLOCK_SIZE);
238 * Updates the revision to EXT2_DYNAMIC_REV
240 void ext2fs_update_dynamic_rev(ext2_filsys fs)
242 struct ext2_super_block *sb = fs->super;
244 if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
247 sb->s_rev_level = EXT2_DYNAMIC_REV;
248 sb->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
249 sb->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
250 /* s_uuid is handled by e2fsck already */
251 /* other fields should be left alone */
254 static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group,
256 struct ext2_super_block *super_shadow)
261 if (sgrp > ((1 << 16) - 1))
262 sgrp = (1 << 16) - 1;
264 super_shadow->s_block_group_nr = sgrp;
265 #ifdef WORDS_BIGENDIAN
266 ext2fs_swap_super(super_shadow);
268 retval = ext2fs_superblock_csum_set(fs, super_shadow);
272 return io_channel_write_blk64(fs->io, group_block, -SUPERBLOCK_SIZE,
276 errcode_t ext2fs_flush(ext2_filsys fs)
278 return ext2fs_flush2(fs, 0);
281 errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
285 unsigned long fs_state;
286 __u32 feature_incompat;
287 struct ext2_super_block *super_shadow = 0;
288 struct ext2_group_desc *group_shadow = 0;
289 #ifdef WORDS_BIGENDIAN
290 struct ext2_group_desc *gdp;
295 struct ext2fs_numeric_progress_struct progress;
297 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
299 fs_state = fs->super->s_state;
300 feature_incompat = fs->super->s_feature_incompat;
302 fs->super->s_wtime = fs->now ? fs->now : time(NULL);
303 fs->super->s_block_group_nr = 0;
306 * If the write_bitmaps() function is present, call it to
307 * flush the bitmaps. This is done this way so that a simple
308 * program that doesn't mess with the bitmaps doesn't need to
309 * drag in the bitmaps.c code.
311 * Bitmap checksums live in the group descriptor, so the
312 * bitmaps need to be written before the descriptors.
314 if (fs->write_bitmaps) {
315 retval = fs->write_bitmaps(fs);
320 /* Prepare the group descriptors for writing */
321 #ifdef WORDS_BIGENDIAN
322 retval = EXT2_ET_NO_MEMORY;
323 retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
326 retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
330 memcpy(super_shadow, fs->super, sizeof(struct ext2_super_block));
331 memcpy(group_shadow, fs->group_desc, (size_t) fs->blocksize *
334 /* swap the group descriptors */
335 for (j = 0; j < fs->group_desc_count; j++) {
336 gdp = ext2fs_group_desc(fs, group_shadow, j);
337 ext2fs_swap_group_desc2(fs, gdp);
340 super_shadow = fs->super;
341 group_shadow = ext2fs_group_desc(fs, fs->group_desc, 0);
345 * Set the state of the FS to be non-valid. (The state has
346 * already been backed up earlier, and will be restored after
347 * we write out the backup superblocks.)
349 fs->super->s_state &= ~EXT2_VALID_FS;
350 fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
353 * If this is an external journal device, don't write out the
354 * block group descriptors or any of the backup superblocks
356 if (fs->super->s_feature_incompat &
357 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
358 goto write_primary_superblock_only;
361 * Write out the master group descriptors, and the backup
362 * superblocks and group descriptors.
364 group_ptr = (char *) group_shadow;
365 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
366 old_desc_blocks = fs->super->s_first_meta_bg;
368 old_desc_blocks = fs->desc_blocks;
370 if (fs->progress_ops && fs->progress_ops->init)
371 (fs->progress_ops->init)(fs, &progress, NULL,
372 fs->group_desc_count);
375 for (i = 0; i < fs->group_desc_count; i++) {
376 blk64_t super_blk, old_desc_blk, new_desc_blk;
378 if (fs->progress_ops && fs->progress_ops->update)
379 (fs->progress_ops->update)(fs, &progress, i);
380 ext2fs_super_and_bgd_loc2(fs, i, &super_blk, &old_desc_blk,
383 if (!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) &&i && super_blk) {
384 retval = write_backup_super(fs, i, super_blk,
389 if (fs->flags & EXT2_FLAG_SUPER_ONLY)
391 if ((old_desc_blk) &&
392 (!(fs->flags & EXT2_FLAG_MASTER_SB_ONLY) || (i == 0))) {
393 retval = io_channel_write_blk64(fs->io,
394 old_desc_blk, old_desc_blocks, group_ptr);
399 int meta_bg = i / EXT2_DESC_PER_BLOCK(fs->super);
401 retval = io_channel_write_blk64(fs->io, new_desc_blk,
402 1, group_ptr + (meta_bg*fs->blocksize));
408 if (fs->progress_ops && fs->progress_ops->close)
409 (fs->progress_ops->close)(fs, &progress, NULL);
411 write_primary_superblock_only:
413 * Write out master superblock. This has to be done
414 * separately, since it is located at a fixed location
415 * (SUPERBLOCK_OFFSET). We flush all other pending changes
416 * out to disk first, just to avoid a race condition with an
417 * insy-tinsy window....
420 fs->super->s_block_group_nr = 0;
421 fs->super->s_state = fs_state;
422 fs->super->s_feature_incompat = feature_incompat;
423 #ifdef WORDS_BIGENDIAN
424 *super_shadow = *fs->super;
425 ext2fs_swap_super(super_shadow);
428 retval = ext2fs_superblock_csum_set(fs, super_shadow);
432 if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC))
433 retval = io_channel_flush(fs->io);
434 retval = write_primary_superblock(fs, super_shadow);
438 fs->flags &= ~EXT2_FLAG_DIRTY;
440 if (!(flags & EXT2_FLAG_FLUSH_NO_SYNC))
441 retval = io_channel_flush(fs->io);
443 fs->super->s_state = fs_state;
444 #ifdef WORDS_BIGENDIAN
446 ext2fs_free_mem(&super_shadow);
448 ext2fs_free_mem(&group_shadow);
453 errcode_t ext2fs_close_free(ext2_filsys *fs_ptr)
456 ext2_filsys fs = *fs_ptr;
458 ret = ext2fs_close2(fs, 0);
465 errcode_t ext2fs_close(ext2_filsys fs)
467 return ext2fs_close2(fs, 0);
470 errcode_t ext2fs_close2(ext2_filsys fs, int flags)
476 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
478 if (fs->write_bitmaps) {
479 retval = fs->write_bitmaps(fs);
483 if (fs->super->s_kbytes_written &&
484 fs->io->manager->get_stats)
485 fs->io->manager->get_stats(fs->io, &stats);
486 if (stats && stats->bytes_written && (fs->flags & EXT2_FLAG_RW)) {
487 fs->super->s_kbytes_written += stats->bytes_written >> 10;
488 meta_blks = fs->desc_blocks + 1;
489 if (!(fs->flags & EXT2_FLAG_SUPER_ONLY))
490 fs->super->s_kbytes_written += meta_blks /
491 (fs->blocksize / 1024);
492 if ((fs->flags & EXT2_FLAG_DIRTY) == 0)
493 fs->flags |= EXT2_FLAG_SUPER_ONLY | EXT2_FLAG_DIRTY;
495 if (fs->flags & EXT2_FLAG_DIRTY) {
496 retval = ext2fs_flush2(fs, flags);
501 retval = ext2fs_mmp_stop(fs);