diff options
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mballoc.c | 82 |
1 files changed, 60 insertions, 22 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index c17063ddb307..860766421fe8 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -335,6 +335,8 @@ static struct kmem_cache *ext4_ac_cachep; static struct kmem_cache *ext4_free_ext_cachep; static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, ext4_group_t group); +static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, + ext4_group_t group); static int ext4_mb_init_per_dev_proc(struct super_block *sb); static int ext4_mb_destroy_per_dev_proc(struct super_block *sb); static void release_blocks_on_commit(journal_t *journal, transaction_t *txn); @@ -858,7 +860,9 @@ static int ext4_mb_init_cache(struct page *page, char *incore) /* * incore got set to the group block bitmap below */ + ext4_lock_group(sb, group); ext4_mb_generate_buddy(sb, data, incore, group); + ext4_unlock_group(sb, group); incore = NULL; } else { /* this is block of bitmap */ @@ -872,6 +876,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore) /* mark all preallocated blks used in in-core bitmap */ ext4_mb_generate_from_pa(sb, data, group); + ext4_mb_generate_from_freelist(sb, data, group); ext4_unlock_group(sb, group); /* set incore so that the buddy information can be @@ -3472,6 +3477,32 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac) } /* + * the function goes through all block freed in the group + * but not yet committed and marks them used in in-core bitmap. + * buddy must be generated from this bitmap + * Need to be called with ext4 group lock (ext4_lock_group) + */ +static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, + ext4_group_t group) +{ + struct rb_node *n; + struct ext4_group_info *grp; + struct ext4_free_data *entry; + + grp = ext4_get_group_info(sb, group); + n = rb_first(&(grp->bb_free_root)); + + while (n) { + entry = rb_entry(n, struct ext4_free_data, node); + mb_set_bits(sb_bgl_lock(EXT4_SB(sb), group), + bitmap, entry->start_blk, + entry->count); + n = rb_next(n); + } + return; +} + +/* * the function goes through all preallocation in this group and marks them * used in in-core bitmap. buddy must be generated from this bitmap * Need to be called with ext4 group lock (ext4_lock_group) @@ -4568,12 +4599,13 @@ static int can_merge(struct ext4_free_data *entry1, static noinline_for_stack int ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, - ext4_group_t group, ext4_grpblk_t block, int count) + struct ext4_free_data *new_entry) { + ext4_grpblk_t block; + struct ext4_free_data *entry; struct ext4_group_info *db = e4b->bd_info; struct super_block *sb = e4b->bd_sb; struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_free_data *entry, *new_entry; struct rb_node **n = &db->bb_free_root.rb_node, *node; struct rb_node *parent = NULL, *new_node; @@ -4581,14 +4613,9 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, BUG_ON(e4b->bd_bitmap_page == NULL); BUG_ON(e4b->bd_buddy_page == NULL); - new_entry = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS); - new_entry->start_blk = block; - new_entry->group = group; - new_entry->count = count; - new_entry->t_tid = handle->h_transaction->t_tid; new_node = &new_entry->node; + block = new_entry->start_blk; - ext4_lock_group(sb, group); if (!*n) { /* first free block exent. We need to protect buddy cache from being freed, @@ -4606,7 +4633,6 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, else if (block >= (entry->start_blk + entry->count)) n = &(*n)->rb_right; else { - ext4_unlock_group(sb, group); ext4_error(sb, __func__, "Double free of blocks %d (%d %d)", block, entry->start_blk, entry->count); @@ -4648,7 +4674,6 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, spin_lock(&sbi->s_md_lock); list_add(&new_entry->list, &handle->h_transaction->t_private_list); spin_unlock(&sbi->s_md_lock); - ext4_unlock_group(sb, group); return 0; } @@ -4753,15 +4778,6 @@ do_more: BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data)); } #endif - mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data, - bit, count); - - /* We dirtied the bitmap block */ - BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); - err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); - if (err) - goto error_return; - if (ac) { ac->ac_b_ex.fe_group = block_group; ac->ac_b_ex.fe_start = bit; @@ -4773,11 +4789,29 @@ do_more: if (err) goto error_return; if (metadata && ext4_handle_valid(handle)) { - /* blocks being freed are metadata. these blocks shouldn't - * be used until this transaction is committed */ - ext4_mb_free_metadata(handle, &e4b, block_group, bit, count); + struct ext4_free_data *new_entry; + /* + * blocks being freed are metadata. these blocks shouldn't + * be used until this transaction is committed + */ + new_entry = kmem_cache_alloc(ext4_free_ext_cachep, GFP_NOFS); + new_entry->start_blk = bit; + new_entry->group = block_group; + new_entry->count = count; + new_entry->t_tid = handle->h_transaction->t_tid; + ext4_lock_group(sb, block_group); + mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data, + bit, count); + ext4_mb_free_metadata(handle, &e4b, new_entry); + ext4_unlock_group(sb, block_group); } else { ext4_lock_group(sb, block_group); + /* need to update group_info->bb_free and bitmap + * with group lock held. generate_buddy look at + * them with group lock_held + */ + mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data, + bit, count); mb_free_blocks(inode, &e4b, bit, count); ext4_mb_return_to_preallocation(inode, &e4b, block, count); ext4_unlock_group(sb, block_group); @@ -4800,6 +4834,10 @@ do_more: *freed += count; + /* We dirtied the bitmap block */ + BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); + err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); + /* And the group descriptor block */ BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |