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Date: Fri, 13 Jun 2008 08:40:14 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: Mingming Cao <cmm@...ibm.com>
Cc: tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix the oldallocator block reservation
accounting with delalloc.
On Thu, Jun 12, 2008 at 01:51:55PM -0700, Mingming Cao wrote:
>
> The changes looks correct, but I think it would be cleaner to put the
> changes about metadata allocation related accounting for delayed
> allocation to ext4_new_meta_blocks() , so it doesn't need to check the
> EXT4_META_BLOCK flags in common code do_blk_alloc all the time.
>
>
updated patch below.
ext4: Fix the oldallocator block reservation accounting with delalloc.
From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Update old block allocator to not decrement s_freeblocks_counter
for allocated blocks with delalloc. Also account for the
actual meta-data allocated. We should not check for freespace
again in allocator with delalloc since we already did block
reservation.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
fs/ext4/balloc.c | 57 ++++++++++++++++++++++++++++++------------------------
1 files changed, 32 insertions(+), 25 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 4331577..69a3c2e 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -1706,7 +1706,12 @@ ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
}
sbi = EXT4_SB(sb);
- *count = ext4_has_free_blocks(sbi, *count);
+ if (!EXT4_I(inode)->i_delalloc_reserved_flag) {
+ /*
+ * With delalloc we already reserved the blocks
+ */
+ *count = ext4_has_free_blocks(sbi, *count);
+ }
if (*count == 0) {
*errp = -ENOSPC;
return 0; /*return with ENOSPC error */
@@ -1907,7 +1912,8 @@ ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
le16_add_cpu(&gdp->bg_free_blocks_count, -num);
gdp->bg_checksum = ext4_group_desc_csum(sbi, group_no, gdp);
spin_unlock(sb_bgl_lock(sbi, group_no));
- percpu_counter_sub(&sbi->s_freeblocks_counter, num);
+ if (!EXT4_I(inode)->i_delalloc_reserved_flag)
+ percpu_counter_sub(&sbi->s_freeblocks_counter, num);
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi, group_no);
@@ -1990,52 +1996,53 @@ static ext4_fsblk_t do_blk_alloc(handle_t *handle, struct inode *inode,
ret = ext4_mb_new_blocks(handle, &ar, errp);
*count = ar.len;
- /*
- * Account for the allocated meta blocks
- */
- if (!(*errp) && (flags & EXT4_META_BLOCK)) {
- spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
- EXT4_I(inode)->i_allocated_meta_blocks += ar.len;
- spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
- }
return ret;
}
/*
- * ext4_new_meta_block() -- allocate block for meta data (indexing) blocks
+ * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
+ * @count: total number of blocks need
* @errp: error code
*
- * Return allocated block number on success
+ * Return 1st allocated block numberon success, *count stores total account
+ * error stores in errp pointer
*/
-ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, int *errp)
+ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, unsigned long *count, int *errp)
{
- unsigned long count = 1;
- return do_blk_alloc(handle, inode, 0, goal,
- &count, errp, EXT4_META_BLOCK);
+ ext4_fsblk_t ret;
+ ret = do_blk_alloc(handle, inode, 0, goal,
+ count, errp, EXT4_META_BLOCK);
+ /*
+ * Account for the allocated meta blocks
+ */
+ if (!(*errp)) {
+ spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
+ EXT4_I(inode)->i_allocated_meta_blocks += *count;
+ spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+ }
+ return ret;
}
/*
- * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
+ * ext4_new_meta_block() -- allocate block for meta data (indexing) blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
- * @count: total number of blocks need
* @errp: error code
*
- * Return 1st allocated block numberon success, *count stores total account
- * error stores in errp pointer
+ * Return allocated block number on success
*/
-ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, unsigned long *count, int *errp)
+ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, int *errp)
{
- return do_blk_alloc(handle, inode, 0, goal,
- count, errp, EXT4_META_BLOCK);
+ unsigned long count = 1;
+ return ext4_new_meta_blocks(handle, inode, goal, &count, errp);
}
/*
--
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