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Message-Id: <1320837428-8516-3-git-send-email-hao.bigrat@gmail.com>
Date: Wed, 9 Nov 2011 19:17:01 +0800
From: Robin Dong <hao.bigrat@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Robin Dong <sanbai@...bao.com>
Subject: [PATCH 2/9 bigalloc] ext4: change ext4_ext_map_blocks to allocate clusters instead of blocks
From: Robin Dong <sanbai@...bao.com>
We need to align to a cluster when users allocate just one block.
Signed-off-by: Robin Dong <sanbai@...bao.com>
---
fs/ext4/extents.c | 45 ++++++++++++---------------------------------
1 files changed, 12 insertions(+), 33 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 597ebcb..3430ddf 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3949,20 +3949,13 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
* Okay, we need to do block allocation.
*/
map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
- newex.ee_block = cpu_to_le32(map->m_lblk);
+ newex.ee_block = cpu_to_le32(map->m_lblk & ~(sbi->s_cluster_ratio-1));
cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
- /*
- * If we are doing bigalloc, check to see if the extent returned
- * by ext4_ext_find_extent() implies a cluster we can use.
- */
- if (cluster_offset && ex &&
- get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
- ar.len = allocated = map->m_len;
- newblock = map->m_pblk;
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
- goto got_allocated_blocks;
- }
+ if (ex)
+ BUG_ON((le32_to_cpu(ex->ee_block) +
+ EXT4_C2B(sbi, ext4_ext_get_actual_len(ex))) >
+ (map->m_lblk & ~(sbi->s_cluster_ratio-1)));
/* find neighbour allocated blocks */
ar.lleft = map->m_lblk;
@@ -3975,16 +3968,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
if (err)
goto out2;
- /* Check if the extent after searching to the right implies a
- * cluster we can use. */
- if ((sbi->s_cluster_ratio > 1) && ex2 &&
- get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
- ar.len = allocated = map->m_len;
- newblock = map->m_pblk;
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
- goto got_allocated_blocks;
- }
-
/*
* See if request is beyond maximum number of blocks we can have in
* a single extent. For an initialized extent this limit is
@@ -3999,7 +3982,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
map->m_len = EXT_UNINIT_MAX_LEN;
/* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */
- newex.ee_len = cpu_to_le16(map->m_len);
+ newex.ee_len = cpu_to_le16(EXT4_NUM_B2C(sbi, map->m_len));
err = ext4_ext_check_overlap(sbi, inode, &newex, path);
if (err)
allocated = ext4_ext_get_actual_len(&newex);
@@ -4036,14 +4019,11 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
ar.goal, newblock, allocated);
free_on_err = 1;
allocated_clusters = ar.len;
- ar.len = EXT4_C2B(sbi, ar.len) - offset;
- if (ar.len > allocated)
- ar.len = allocated;
got_allocated_blocks:
/* try to insert new extent into found leaf and return */
- ext4_ext_store_pblock(&newex, newblock + offset);
- newex.ee_len = cpu_to_le16(ar.len);
+ ext4_ext_store_pblock(&newex, newblock);
+ newex.ee_len = cpu_to_le16(allocated_clusters);
/* Mark uninitialized */
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){
ext4_ext_mark_uninitialized(&newex);
@@ -4066,7 +4046,8 @@ got_allocated_blocks:
map->m_flags |= EXT4_MAP_UNINIT;
}
- err = check_eofblocks_fl(handle, inode, map->m_lblk, path, ar.len);
+ err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
+ EXT4_C2B(sbi, allocated_clusters));
if (!err)
err = ext4_ext_insert_extent(handle, inode, path,
&newex, flags);
@@ -4086,8 +4067,6 @@ got_allocated_blocks:
/* previous routine could use block we allocated */
newblock = ext4_ext_pblock(&newex);
allocated = ext4_ext_get_actual_blocks(&newex, inode->i_sb);
- if (allocated > map->m_len)
- allocated = map->m_len;
map->m_flags |= EXT4_MAP_NEW;
/*
@@ -4174,7 +4153,7 @@ got_allocated_blocks:
* when it is _not_ an uninitialized extent.
*/
if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) {
- ext4_ext_put_in_cache(inode, map->m_lblk, allocated, newblock);
+ ext4_ext_put_in_cache(inode, ar.logical, allocated, newblock);
ext4_update_inode_fsync_trans(handle, inode, 1);
} else
ext4_update_inode_fsync_trans(handle, inode, 0);
@@ -4183,7 +4162,7 @@ out:
allocated = map->m_len;
ext4_ext_show_leaf(inode, path);
map->m_flags |= EXT4_MAP_MAPPED;
- map->m_pblk = newblock;
+ map->m_pblk = newblock + offset;
map->m_len = allocated;
out2:
if (path) {
--
1.7.3.2
--
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