Commit 8a0aba73 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: let the block device know when unused blocks can be discarded 



Let the block device know when unused blocks can be discarded, using
the new sb_issue_discard() interface.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent a1aebc1e

fs/ext4/mballoc.c

+7 −0
Original line number Diff line number Diff line
@@ -2653,6 +2653,7 @@ ext4_mb_free_committed_blocks(struct super_block *sb) 
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	int err, count = 0, count2 = 0;

	struct ext4_free_data *entry;

	ext4_fsblk_t discard_block;



	if (list_empty(&sbi->s_committed_transaction))

		return;
@@ -2696,6 +2697,12 @@ ext4_mb_free_committed_blocks(struct super_block *sb) 
			page_cache_release(e4b.bd_bitmap_page);

		}

		ext4_unlock_group(sb, entry->group);

		discard_block = (ext4_fsblk_t) entry->group * EXT4_BLOCKS_PER_GROUP(sb)

			+ entry->start_blk

			+ le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);

		trace_mark(ext4_discard_blocks, "dev %s blk %llu count %u", sb->s_id,

			   (unsigned long long) discard_block, entry->count);

		sb_issue_discard(sb, discard_block, entry->count);



		kmem_cache_free(ext4_free_ext_cachep, entry);

		ext4_mb_release_desc(&e4b);

fs/ext4/mballoc.h

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 
#include <linux/pagemap.h>

#include <linux/seq_file.h>

#include <linux/version.h>

#include <linux/blkdev.h>

#include <linux/marker.h>

#include "ext4_jbd2.h"

#include "ext4.h"

#include "group.h"