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ext4: cleanup block allocator 

Move the code related to block allocation to a single function and add helper
funtions to differient allocation for data and meta data blocks

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V 2008-07-11 19:27:31 -04:00 committed by Theodore Ts'o
parent 7061eba75c
commit 654b4908bc
5 changed files with 84 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
fs/ext4/balloc.c
View File

@ -1640,20 +1640,24 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
}
/**
* 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;
@ -1923,78 +1927,95 @@ 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)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
#define EXT4_META_BLOCK 0x1
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;
}
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) blocks
*
* @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

2
fs/ext4/ext4.h
View File

@ -977,7 +977,7 @@ 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_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);

10
fs/ext4/extents.c
View File

@ -179,8 +179,11 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
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)
{
@ -690,7 +693,8 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
/* 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;
@ -886,7 +890,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
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;

2
fs/ext4/inode.c
View File

@ -561,7 +561,7 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
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)) {

2
fs/ext4/mballoc.c
View File

@ -4041,7 +4041,7 @@ 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_old_new_blocks(handle, ar->inode, ar->goal,
&(ar->len), errp);
return block;
}