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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: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2008-10-16 10:06:27 -04:00
parent a1aebc1e2d
commit 8a0aba733d
2 changed files with 9 additions and 0 deletions
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7
fs/ext4/mballoc.c
View File

@ -2653,6 +2653,7 @@ ext4_mb_free_committed_blocks(struct super_block *sb)
struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_sb_info *sbi = EXT4_SB(sb);
int err, count = 0, count2 = 0; int err, count = 0, count2 = 0;
struct ext4_free_data *entry; struct ext4_free_data *entry;
ext4_fsblk_t discard_block;
if (list_empty(&sbi->s_committed_transaction)) if (list_empty(&sbi->s_committed_transaction))
return; return;
@ -2696,6 +2697,12 @@ ext4_mb_free_committed_blocks(struct super_block *sb)
page_cache_release(e4b.bd_bitmap_page); page_cache_release(e4b.bd_bitmap_page);
} }
ext4_unlock_group(sb, entry->group); 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); kmem_cache_free(ext4_free_ext_cachep, entry);
ext4_mb_release_desc(&e4b); ext4_mb_release_desc(&e4b);

2
fs/ext4/mballoc.h
View File

@ -18,6 +18,8 @@
#include <linux/pagemap.h> #include <linux/pagemap.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <linux/version.h> #include <linux/version.h>
#include <linux/blkdev.h>
#include <linux/marker.h>
#include "ext4_jbd2.h" #include "ext4_jbd2.h"
#include "ext4.h" #include "ext4.h"
#include "group.h" #include "group.h"