Patchwork [RFC] support discard in non-journal ext4

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Submitter Jiaying Zhang
Date May 13, 2010, 5 a.m.
Message ID <20100513050014.879651BC316@ruihe.smo.corp.google.com>
Download mbox | patch
Permalink /patch/52445/
State New
Headers show

Comments

Jiaying Zhang - May 13, 2010, 5 a.m.
This patch issues discard request for freed blocks in ext4_free_blocks()
if ext4 is mounted with discard option and without journal.

Author: Jiaying Zhang <jiayingz@google.com>
Date:   Wed May 12 21:11:46 2010 -0700

    Issue discard request in ext4_free_blocks() when ext4 has no journal and
    is mounted with discard option.
    
    Signed-off-by: Jiaying Zhang <jiayingz@google.com>

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Coly Li - May 13, 2010, 9:08 a.m.
On 05/13/2010 01:00 PM, Jiaying Zhang Wrote:
> This patch issues discard request for freed blocks in ext4_free_blocks()
> if ext4 is mounted with discard option and without journal.
> 
> Author: Jiaying Zhang <jiayingz@google.com>
> Date:   Wed May 12 21:11:46 2010 -0700
> 
>     Issue discard request in ext4_free_blocks() when ext4 has no journal and
>     is mounted with discard option.
>     
>     Signed-off-by: Jiaying Zhang <jiayingz@google.com>
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index a291cc3..d51b79a 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -2513,6 +2513,22 @@ int ext4_mb_release(struct super_block *sb)
>  	return 0;
>  }
>  
> +static void ext4_issue_discard(struct super_block *sb, ext4_group_t block_group,
> +		ext4_grpblk_t block, int count)
> +{
> +	int ret;
> +	ext4_fsblk_t discard_block;
> +
> +	discard_block = block + ext4_group_first_block_no(sb, block_group);
> +	trace_ext4_discard_blocks(sb,
> +			(unsigned long long) discard_block, count);
> +	ret = sb_issue_discard(sb, discard_block, count);
> +	if (ret == EOPNOTSUPP) {
> +		ext4_warning(sb, "discard not supported, disabling");
> +		clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
> +	}
> +}
> +

How about make it as an inline routine? Thanks.

Patch

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a291cc3..d51b79a 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2513,6 +2513,22 @@  int ext4_mb_release(struct super_block *sb)
 	return 0;
 }
 
+static void ext4_issue_discard(struct super_block *sb, ext4_group_t block_group,
+		ext4_grpblk_t block, int count)
+{
+	int ret;
+	ext4_fsblk_t discard_block;
+
+	discard_block = block + ext4_group_first_block_no(sb, block_group);
+	trace_ext4_discard_blocks(sb,
+			(unsigned long long) discard_block, count);
+	ret = sb_issue_discard(sb, discard_block, count);
+	if (ret == EOPNOTSUPP) {
+		ext4_warning(sb, "discard not supported, disabling");
+		clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
+	}
+}
+
 /*
  * This function is called by the jbd2 layer once the commit has finished,
  * so we know we can free the blocks that were released with that commit.
@@ -2532,22 +2548,9 @@  static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
 		mb_debug(1, "gonna free %u blocks in group %u (0x%p):",
 			 entry->count, entry->group, entry);
 
-		if (test_opt(sb, DISCARD)) {
-			int ret;
-			ext4_fsblk_t discard_block;
-
-			discard_block = entry->start_blk +
-				ext4_group_first_block_no(sb, entry->group);
-			trace_ext4_discard_blocks(sb,
-					(unsigned long long)discard_block,
-					entry->count);
-			ret = sb_issue_discard(sb, discard_block, entry->count);
-			if (ret == EOPNOTSUPP) {
-				ext4_warning(sb,
-					"discard not supported, disabling");
-				clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
-			}
-		}
+		if (test_opt(sb, DISCARD))
+			ext4_issue_discard(sb, entry->group,
+					entry->start_blk, entry->count);
 
 		err = ext4_mb_load_buddy(sb, entry->group, &e4b);
 		/* we expect to find existing buddy because it's pinned */
@@ -4600,6 +4603,8 @@  do_more:
 		mb_clear_bits(bitmap_bh->b_data, bit, count);
 		mb_free_blocks(inode, &e4b, bit, count);
 		ext4_mb_return_to_preallocation(inode, &e4b, block, count);
+		if (test_opt(sb, DISCARD))
+			ext4_issue_discard(sb, block_group, bit, count);
 	}
 
 	ret = ext4_free_blks_count(sb, gdp) + count;