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| author | Theodore Ts'o <tytso@mit.edu> | 2008-10-16 10:06:27 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-16 10:06:27 -0400 |
| commit | 8a0aba733db1adb5e1f0e828889a18f4c1c512de (patch) | |
| tree | e66c57f34cdb28c45c34dfc63a93c72791316fe0 /fs/ext4/mballoc.c | |
| parent | a1aebc1e2da9a7bee4ff8cce510b08f469d1929e (diff) | |
| download | lwn-8a0aba733db1adb5e1f0e828889a18f4c1c512de.tar.gz lwn-8a0aba733db1adb5e1f0e828889a18f4c1c512de.zip | |
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>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index bd9b011941a2..815a22ea6078 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -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); |