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ext4: fix online resize with mballoc

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Update group infos when updating a group's descriptor.
Add group infos when adding a group's descriptor.
Refresh cache pages used by mb_alloc when changes occur.
This will probably need modifications when META_BG resizing will be allowed.

Signed-off-by: Frederic Bohe <frederic.bohe@bull.net>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
This commit is contained in:
Frederic Bohe 2008-07-11 19:27:31 -04:00 • committed by Theodore Ts'o
parent 953e622b60
commit 5f21b0e642
3 changed files with 234 additions and 56 deletions
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52
fs/ext4/resize.c
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@ -865,6 +865,15 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
gdp->bg_free_inodes_count = cpu_to_le16(EXT4_INODES_PER_GROUP(sb));
gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
/*
* We can allocate memory for mb_alloc based on the new group
* descriptor
*/
if (test_opt(sb, MBALLOC)) {
err = ext4_mb_add_more_groupinfo(sb, input->group, gdp);
if (err)
goto exit_journal;
}
/*
* Make the new blocks and inodes valid next. We do this before
* increasing the group count so that once the group is enabled,
@ -957,6 +966,8 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
handle_t *handle;
int err;
unsigned long freed_blocks;
ext4_group_t group;
struct ext4_group_info *grp;
/* We don't need to worry about locking wrt other resizers just
* yet: we're going to revalidate es->s_blocks_count after
@ -988,7 +999,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
}
/* Handle the remaining blocks in the last group only. */
ext4_get_group_no_and_offset(sb, o_blocks_count, NULL, &last);
ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
if (last == 0) {
ext4_warning(sb, __func__,
@ -1060,6 +1071,45 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
o_blocks_count + add);
if ((err = ext4_journal_stop(handle)))
goto exit_put;
/*
* Mark mballoc pages as not up to date so that they will be updated
* next time they are loaded by ext4_mb_load_buddy.
*/
if (test_opt(sb, MBALLOC)) {
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct inode *inode = sbi->s_buddy_cache;
int blocks_per_page;
int block;
int pnum;
struct page *page;
/* Set buddy page as not up to date */
blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
block = group * 2;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
/* Set bitmap page as not up to date */
block++;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
/* Get the info on the last group */
grp = ext4_get_group_info(sb, group);
/* Update free blocks in group info */
ext4_mb_update_group_info(grp, add);
}
if (test_opt(sb, DEBUG))
printk(KERN_DEBUG "EXT4-fs: extended group to %llu blocks\n",
ext4_blocks_count(es));