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Date: Fri, 06 Jun 2008 18:12:50 -0700
From: Mingming Cao <cmm@...ibm.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: cleanup blockallocator
On Fri, 2008-06-06 at 23:54 +0530, Aneesh Kumar K.V wrote:
> Move the code for block allocation to a single function and add helpers
> for the allocation of data and meta data blocks
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
> fs/ext4/balloc.c | 74 ++++++++++++++++++++--------------------------------
> fs/ext4/ext4.h | 2 +-
> fs/ext4/mballoc.c | 2 +-
> 3 files changed, 31 insertions(+), 47 deletions(-)
>
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index b961ad1..10c2d49 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -1645,7 +1645,7 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
> }
>
> /**
> - * ext4_new_blocks_old() -- core block(s) allocation function
> + * ext4_orlov_new_blocks() -- core block(s) allocation function
How about calling ext4_old_new_blocks? and expand the note as
core block bitmap based block allocation function?
I added a few comments to each block allocator, and clear up a few other
confusion about allocation, how about this?
---
fs/ext4/balloc.c | 74 +++++++++++++++++++++--------------------------------
fs/ext4/ext4.h | 2 +
fs/ext4/mballoc.c | 2 +
3 files changed, 31 insertions(+), 47 deletions(-)
Index: linux-2.6.26-rc5/fs/ext4/balloc.c
===================================================================
--- linux-2.6.26-rc5.orig/fs/ext4/balloc.c 2008-06-06 17:06:03.000000000 -0700
+++ linux-2.6.26-rc5/fs/ext4/balloc.c 2008-06-06 17:59:05.000000000 -0700
@@ -1645,20 +1645,24 @@ int ext4_should_retry_alloc(struct super
}
/**
- * ext4_new_blocks_old() -- core block(s) allocation function
+ * ext4_old_new_blocks() -- core block bitmap based block allocation function
+ *
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @count: target number of blocks to allocate
* @errp: error code
*
- * ext4_new_blocks uses a goal block to assist allocation. It tries to
- * allocate block(s) from the block group contains the goal block first. If that
- * fails, it will try to allocate block(s) from other block groups without
- * any specific goal block.
+ * ext4_old_new_blocks uses a goal block to assist allocation and look up
+ * the block bitmap directly to do block allocation. It tries to
+ * allocate block(s) from the block group contains the goal block first. If
+ * that fails, it will try to allocate block(s) from other block groups
+ * without any specific goal block.
+ *
+ * This function is called when -o nomballoc mount option is enabled
*
*/
-ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
+ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct buffer_head *bitmap_bh = NULL;
@@ -1928,78 +1932,95 @@ out:
return 0;
}
-ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, int *errp)
-{
- struct ext4_allocation_request ar;
- ext4_fsblk_t ret;
-
- if (!test_opt(inode->i_sb, MBALLOC)) {
- unsigned long count = 1;
- ret = ext4_new_blocks_old(handle, inode, goal, &count, errp);
- return ret;
- }
-
- memset(&ar, 0, sizeof(ar));
- ar.inode = inode;
- ar.goal = goal;
- ar.len = 1;
- ret = ext4_mb_new_blocks(handle, &ar, errp);
- return ret;
-}
-ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, unsigned long *count, int *errp)
-{
- struct ext4_allocation_request ar;
- ext4_fsblk_t ret;
-
- if (!test_opt(inode->i_sb, MBALLOC)) {
- ret = ext4_new_blocks_old(handle, inode, goal, count, errp);
- return ret;
- }
+#define EXT4_META_BLOCK 0x1
- memset(&ar, 0, sizeof(ar));
- ar.inode = inode;
- ar.goal = goal;
- ar.len = *count;
- ret = ext4_mb_new_blocks(handle, &ar, errp);
- *count = ar.len;
- return ret;
-}
-
-ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
+static ext4_fsblk_t do_blk_alloc(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, ext4_fsblk_t goal,
- unsigned long *count, int *errp)
+ unsigned long *count, int *errp, int flags)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
if (!test_opt(inode->i_sb, MBALLOC)) {
- ret = ext4_new_blocks_old(handle, inode, goal, count, errp);
- return ret;
+ return ext4_old_new_blocks(handle, inode, goal, count, errp);
}
memset(&ar, 0, sizeof(ar));
/* Fill with neighbour allocated blocks */
- ar.lleft = 0;
- ar.pleft = 0;
- ar.lright = 0;
- ar.pright = 0;
ar.inode = inode;
ar.goal = goal;
ar.len = *count;
ar.logical = iblock;
- if (S_ISREG(inode->i_mode))
+
+ if (S_ISREG(inode->i_mode) && !(flags & EXT4_META_BLOCK))
+ /* enable in-core preallocation for data block allocation */
ar.flags = EXT4_MB_HINT_DATA;
else
/* disable in-core preallocation for non-regular files */
ar.flags = 0;
+
ret = ext4_mb_new_blocks(handle, &ar, errp);
*count = ar.len;
return ret;
}
+/*
+ * ext4_new_meta_block() -- allocate block for meta data (indexing) block
+ *
+ * @handle: handle to this transaction
+ * @inode: file inode
+ * @goal: given target block(filesystem wide)
+ * @errp: error code
+ *
+ * Return allocated block number on success
+ */
+ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, int *errp)
+{
+ unsigned long count = 1;
+ return do_blk_alloc(handle, inode, 0, goal,
+ &count, errp, EXT4_META_BLOCK);
+}
+
+/*
+ * 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 1st allocated block numberon success, *count stores total account
+ * error stores in errp pointer
+ */
+ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, unsigned long *count, int *errp)
+{
+ return do_blk_alloc(handle, inode, 0, goal,
+ count, errp, EXT4_META_BLOCK);
+}
+
+/*
+ * ext4_new_blocks() -- allocate data 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
+ */
+
+ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
+ ext4_lblk_t iblock, ext4_fsblk_t goal,
+ unsigned long *count, int *errp)
+{
+ return do_blk_alloc(handle, inode, iblock, goal, count, errp, 0);
+}
/**
* ext4_count_free_blocks() -- count filesystem free blocks
Index: linux-2.6.26-rc5/fs/ext4/ext4.h
===================================================================
--- linux-2.6.26-rc5.orig/fs/ext4/ext4.h 2008-06-06 17:06:03.000000000 -0700
+++ linux-2.6.26-rc5/fs/ext4/ext4.h 2008-06-06 17:49:58.000000000 -0700
@@ -977,7 +977,7 @@ extern ext4_fsblk_t ext4_new_meta_blocks
extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, ext4_fsblk_t goal,
unsigned long *count, int *errp);
-extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
+extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
ext4_fsblk_t block, unsigned long count, int metadata);
Index: linux-2.6.26-rc5/fs/ext4/extents.c
===================================================================
--- linux-2.6.26-rc5.orig/fs/ext4/extents.c 2008-06-06 17:39:45.000000000 -0700
+++ linux-2.6.26-rc5/fs/ext4/extents.c 2008-06-06 17:54:03.000000000 -0700
@@ -180,8 +180,11 @@ static ext4_fsblk_t ext4_ext_find_goal(s
return bg_start + colour + block;
}
+/*
+ * Allocation for a meta data block
+ */
static ext4_fsblk_t
-ext4_ext_new_block(handle_t *handle, struct inode *inode,
+ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
struct ext4_extent *ex, int *err)
{
@@ -688,7 +691,8 @@ static int ext4_ext_split(handle_t *hand
/* allocate all needed blocks */
ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
for (a = 0; a < depth - at; a++) {
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path,
+ newext, &err);
if (newblock == 0)
goto cleanup;
ablocks[a] = newblock;
@@ -884,7 +888,7 @@ static int ext4_ext_grow_indepth(handle_
ext4_fsblk_t newblock;
int err = 0;
- newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
+ newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
if (newblock == 0)
return err;
Index: linux-2.6.26-rc5/fs/ext4/inode.c
===================================================================
--- linux-2.6.26-rc5.orig/fs/ext4/inode.c 2008-06-06 17:56:09.000000000 -0700
+++ linux-2.6.26-rc5/fs/ext4/inode.c 2008-06-06 17:56:41.000000000 -0700
@@ -561,7 +561,7 @@ static int ext4_alloc_blocks(handle_t *h
goto allocated;
/* Now allocate data blocks */
count = target;
- /* allocating blocks for indirect blocks and direct blocks */
+ /* allocating blocks for data blocks */
current_block = ext4_new_blocks(handle, inode, iblock,
goal, &count, err);
if (*err && (target == blks)) {
--
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