From 5f21b0e642d7bf6fe4434c9ba12bc9cb96b17cf7 Mon Sep 17 00:00:00 2001 From: Frederic Bohe Date: Fri, 11 Jul 2008 19:27:31 -0400 Subject: [PATCH] ext4: fix online resize with mballoc 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 Signed-off-by: Mingming Cao --- fs/ext4/ext4.h | 4 + fs/ext4/mballoc.c | 234 +++++++++++++++++++++++++++++++++++----------- fs/ext4/resize.c | 52 ++++++++++- 3 files changed, 234 insertions(+), 56 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2c4b48519c8b..64edb09c481e 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1033,6 +1033,10 @@ extern int __init init_ext4_mballoc(void); extern void exit_ext4_mballoc(void); extern void ext4_mb_free_blocks(handle_t *, struct inode *, unsigned long, unsigned long, int, unsigned long *); +extern int ext4_mb_add_more_groupinfo(struct super_block *sb, + ext4_group_t i, struct ext4_group_desc *desc); +extern void ext4_mb_update_group_info(struct ext4_group_info *grp, + ext4_grpblk_t add); /* inode.c */ diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 1666ac184e31..8d254ca83d9e 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2236,21 +2236,192 @@ ext4_mb_store_history(struct ext4_allocation_context *ac) #define ext4_mb_history_init(sb) #endif + +/* Create and initialize ext4_group_info data for the given group. */ +int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *desc) +{ + int i, len; + int metalen = 0; + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_info **meta_group_info; + + /* + * First check if this group is the first of a reserved block. + * If it's true, we have to allocate a new table of pointers + * to ext4_group_info structures + */ + if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { + metalen = sizeof(*meta_group_info) << + EXT4_DESC_PER_BLOCK_BITS(sb); + meta_group_info = kmalloc(metalen, GFP_KERNEL); + if (meta_group_info == NULL) { + printk(KERN_ERR "EXT4-fs: can't allocate mem for a " + "buddy group\n"); + goto exit_meta_group_info; + } + sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = + meta_group_info; + } + + /* + * calculate needed size. if change bb_counters size, + * don't forget about ext4_mb_generate_buddy() + */ + len = offsetof(typeof(**meta_group_info), + bb_counters[sb->s_blocksize_bits + 2]); + + meta_group_info = + sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]; + i = group & (EXT4_DESC_PER_BLOCK(sb) - 1); + + meta_group_info[i] = kzalloc(len, GFP_KERNEL); + if (meta_group_info[i] == NULL) { + printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n"); + goto exit_group_info; + } + set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, + &(meta_group_info[i]->bb_state)); + + /* + * initialize bb_free to be able to skip + * empty groups without initialization + */ + if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { + meta_group_info[i]->bb_free = + ext4_free_blocks_after_init(sb, group, desc); + } else { + meta_group_info[i]->bb_free = + le16_to_cpu(desc->bg_free_blocks_count); + } + + INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list); + +#ifdef DOUBLE_CHECK + { + struct buffer_head *bh; + meta_group_info[i]->bb_bitmap = + kmalloc(sb->s_blocksize, GFP_KERNEL); + BUG_ON(meta_group_info[i]->bb_bitmap == NULL); + bh = ext4_read_block_bitmap(sb, group); + BUG_ON(bh == NULL); + memcpy(meta_group_info[i]->bb_bitmap, bh->b_data, + sb->s_blocksize); + put_bh(bh); + } +#endif + + return 0; + +exit_group_info: + /* If a meta_group_info table has been allocated, release it now */ + if (group % EXT4_DESC_PER_BLOCK(sb) == 0) + kfree(sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]); +exit_meta_group_info: + return -ENOMEM; +} /* ext4_mb_add_groupinfo */ + +/* + * Add a group to the existing groups. + * This function is used for online resize + */ +int ext4_mb_add_more_groupinfo(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *desc) +{ + 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; + int err; + + /* Add group based on group descriptor*/ + err = ext4_mb_add_groupinfo(sb, group, desc); + if (err) + return err; + + /* + * Cache pages containing dynamic mb_alloc datas (buddy and bitmap + * datas) are set not up to date so that they will be re-initilaized + * during the next call to ext4_mb_load_buddy + */ + + /* 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); + } + + return 0; +} + +/* + * Update an existing group. + * This function is used for online resize + */ +void ext4_mb_update_group_info(struct ext4_group_info *grp, ext4_grpblk_t add) +{ + grp->bb_free += add; +} + static int ext4_mb_init_backend(struct super_block *sb) { ext4_group_t i; - int j, len, metalen; + int metalen; struct ext4_sb_info *sbi = EXT4_SB(sb); - int num_meta_group_infos = - (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) >> - EXT4_DESC_PER_BLOCK_BITS(sb); + struct ext4_super_block *es = sbi->s_es; + int num_meta_group_infos; + int num_meta_group_infos_max; + int array_size; struct ext4_group_info **meta_group_info; + struct ext4_group_desc *desc; + + /* This is the number of blocks used by GDT */ + num_meta_group_infos = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - + 1) >> EXT4_DESC_PER_BLOCK_BITS(sb); + /* + * This is the total number of blocks used by GDT including + * the number of reserved blocks for GDT. + * The s_group_info array is allocated with this value + * to allow a clean online resize without a complex + * manipulation of pointer. + * The drawback is the unused memory when no resize + * occurs but it's very low in terms of pages + * (see comments below) + * Need to handle this properly when META_BG resizing is allowed + */ + num_meta_group_infos_max = num_meta_group_infos + + le16_to_cpu(es->s_reserved_gdt_blocks); + + /* + * array_size is the size of s_group_info array. We round it + * to the next power of two because this approximation is done + * internally by kmalloc so we can have some more memory + * for free here (e.g. may be used for META_BG resize). + */ + array_size = 1; + while (array_size < sizeof(*sbi->s_group_info) * + num_meta_group_infos_max) + array_size = array_size << 1; /* An 8TB filesystem with 64-bit pointers requires a 4096 byte * kmalloc. A 128kb malloc should suffice for a 256TB filesystem. * So a two level scheme suffices for now. */ - sbi->s_group_info = kmalloc(sizeof(*sbi->s_group_info) * - num_meta_group_infos, GFP_KERNEL); + sbi->s_group_info = kmalloc(array_size, GFP_KERNEL); if (sbi->s_group_info == NULL) { printk(KERN_ERR "EXT4-fs: can't allocate buddy meta group\n"); return -ENOMEM; @@ -2277,62 +2448,15 @@ static int ext4_mb_init_backend(struct super_block *sb) sbi->s_group_info[i] = meta_group_info; } - /* - * calculate needed size. if change bb_counters size, - * don't forget about ext4_mb_generate_buddy() - */ - len = sizeof(struct ext4_group_info); - len += sizeof(unsigned short) * (sb->s_blocksize_bits + 2); for (i = 0; i < sbi->s_groups_count; i++) { - struct ext4_group_desc *desc; - - meta_group_info = - sbi->s_group_info[i >> EXT4_DESC_PER_BLOCK_BITS(sb)]; - j = i & (EXT4_DESC_PER_BLOCK(sb) - 1); - - meta_group_info[j] = kzalloc(len, GFP_KERNEL); - if (meta_group_info[j] == NULL) { - printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n"); - goto err_freebuddy; - } desc = ext4_get_group_desc(sb, i, NULL); if (desc == NULL) { printk(KERN_ERR "EXT4-fs: can't read descriptor %lu\n", i); - i++; goto err_freebuddy; } - set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, - &(meta_group_info[j]->bb_state)); - - /* - * initialize bb_free to be able to skip - * empty groups without initialization - */ - if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { - meta_group_info[j]->bb_free = - ext4_free_blocks_after_init(sb, i, desc); - } else { - meta_group_info[j]->bb_free = - le16_to_cpu(desc->bg_free_blocks_count); - } - - INIT_LIST_HEAD(&meta_group_info[j]->bb_prealloc_list); - -#ifdef DOUBLE_CHECK - { - struct buffer_head *bh; - meta_group_info[j]->bb_bitmap = - kmalloc(sb->s_blocksize, GFP_KERNEL); - BUG_ON(meta_group_info[j]->bb_bitmap == NULL); - bh = ext4_read_block_bitmap(sb, i); - BUG_ON(bh == NULL); - memcpy(meta_group_info[j]->bb_bitmap, bh->b_data, - sb->s_blocksize); - put_bh(bh); - } -#endif - + if (ext4_mb_add_groupinfo(sb, i, desc) != 0) + goto err_freebuddy; } return 0; diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 9ff7b1c04239..f000fbe2cd93 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -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)); -- 2.20.1