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Date: Thu, 5 Jun 2008 14:13:29 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: Theodore Tso <tytso@....edu>
Cc: cmm@...ibm.com, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH -v2] ext4: Use inode preallocation with -o noextents
On Wed, Jun 04, 2008 at 11:22:20PM -0400, Theodore Tso wrote:
> when I moved this patch to the beginning of the unstable patch queue,
> it didn't apply. When I tried to look at it, my head started
> spinning. The patch applied to the wrong function, apparently,
> because there is so much code duplication "patch" got confused. I
> can't blame it, though, because *I* got confused.
>
> fs/ext4/balloc.c is a complete disaster right now. We have:
>
> ext4_new_blocks_old()
> ext4_new_meta_block()
> ext4_new_meta_blocks()
> ext4_new_blocks()
>
> ... and without any comments, it is extremely impenetrable. Someone
> needs to document what the heck all of the various functions have to
> do with each other, when they get used (i.e., with which mount options).
>
> Why aren't we factoring out the last three into a single function?
Something like below ? . I will send a final patch once I get the
patchqueu updated. I am not able to reach repo.or.cz currently.
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index bd18ceb..abbc500 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -1656,7 +1656,7 @@ 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
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
@@ -1669,7 +1669,7 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
* any specific goal block.
*
*/
-ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
+ext4_fsblk_t ext4_orlov_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct buffer_head *bitmap_bh = NULL;
@@ -1942,88 +1942,68 @@ ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
return 0;
}
-ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, int *errp)
+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, int meta)
{
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);
+ ret = ext4_orlov_new_blocks(handle, inode, goal, count, errp);
return ret;
}
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 = 1;
+ ar.len = *count;
+ ar.logical = iblock;
+ if (S_ISREG(inode->i_mode) && !meta)
+ 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;
/*
* Account for the allocated meta blocks
*/
- if (!(*errp)) {
+ if (!(*errp) && meta) {
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_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, 1);
+}
+
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;
- }
-
- 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;
+ return do_blk_alloc(handle, inode, 0, goal, count, errp, 1);
}
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)
{
- 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;
- }
-
- 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))
- 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;
+ return do_blk_alloc(handle, inode, iblock, goal, count, errp, 0);
}
-
/**
* ext4_count_free_blocks() -- count filesystem free blocks
* @sb: superblock
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 19d48dd..c401253 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1049,7 +1049,7 @@ extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
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_orlov_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
ext4_fsblk_t nblocks);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 09922ae..a810a21 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4048,7 +4048,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
sbi = EXT4_SB(sb);
if (!test_opt(sb, MBALLOC)) {
- block = ext4_new_blocks_old(handle, ar->inode, ar->goal,
+ block = ext4_orlov_new_blocks(handle, ar->inode, ar->goal,
&(ar->len), errp);
return block;
}
--
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