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authorDmitry Monakhov <dmonakhov@openvz.org>2014-10-02 04:57:09 +0200
committerTheodore Ts'o <tytso@mit.edu>2014-10-02 04:57:09 +0200
commitbe5cd90ddaf471e676fad6ced29e69e8610c5d20 (patch)
tree3009c16441b2c134588c714c61e629b07a4974cf /fs/ext4/extents.c
parentext4: get rid of code duplication (diff)
downloadlinux-be5cd90ddaf471e676fad6ced29e69e8610c5d20.tar.xz
linux-be5cd90ddaf471e676fad6ced29e69e8610c5d20.zip
ext4: optimize block allocation on grow indepth
It is reasonable to prepend newly created index to older one. [ Dropped no longer used function parameter newext. -tytso ] Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 8170b3254767..c3ed9af20d20 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1263,16 +1263,24 @@ cleanup:
* just created block
*/
static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
- unsigned int flags,
- struct ext4_extent *newext)
+ unsigned int flags)
{
struct ext4_extent_header *neh;
struct buffer_head *bh;
- ext4_fsblk_t newblock;
+ ext4_fsblk_t newblock, goal = 0;
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
int err = 0;
- newblock = ext4_ext_new_meta_block(handle, inode, NULL,
- newext, &err, flags);
+ /* Try to prepend new index to old one */
+ if (ext_depth(inode))
+ goal = ext4_idx_pblock(EXT_FIRST_INDEX(ext_inode_hdr(inode)));
+ if (goal > le32_to_cpu(es->s_first_data_block)) {
+ flags |= EXT4_MB_HINT_TRY_GOAL;
+ goal--;
+ } else
+ goal = ext4_inode_to_goal_block(inode);
+ newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
+ NULL, &err);
if (newblock == 0)
return err;
@@ -1373,7 +1381,7 @@ repeat:
err = PTR_ERR(path);
} else {
/* tree is full, time to grow in depth */
- err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext);
+ err = ext4_ext_grow_indepth(handle, inode, mb_flags);
if (err)
goto out;