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Date: Tue, 19 Mar 2013 20:06:00 +0400
From: Andrey Sidorov <qrxd43@...orola.com>
To: linux-ext4@...r.kernel.org
Subject: [PATCH 1/5] libext2fs: Optimize ext2fs_allocate_group_table()
Iterate over groups instead of blocks.
Signed-off-by: Andrey Sidorov <qrxd43@...orola.com>
---
lib/ext2fs/alloc_tables.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/lib/ext2fs/alloc_tables.c b/lib/ext2fs/alloc_tables.c
index 5e6e556..e51dcee 100644
--- a/lib/ext2fs/alloc_tables.c
+++ b/lib/ext2fs/alloc_tables.c
@@ -205,16 +205,27 @@ errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
bmap, &new_blk);
if (retval)
return retval;
- for (j=0, blk = new_blk;
- j < fs->inode_blocks_per_group;
- j++, blk++) {
- ext2fs_mark_block_bitmap2(bmap, blk);
- if (flexbg_size) {
- dgrp_t gr = ext2fs_group_of_blk2(fs, blk);
- ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
- ext2fs_free_blocks_count_add(fs->super, -1);
- ext2fs_bg_flags_clear(fs, gr,
- EXT2_BG_BLOCK_UNINIT);
+
+ ext2fs_mark_block_bitmap_range2(bmap, new_blk, fs->inode_blocks_per_group);
+ if (flexbg_size) {
+ blk64_t last_blk = new_blk + fs->inode_blocks_per_group - 1;
+ dgrp_t gr = ext2fs_group_of_blk2(fs, new_blk);
+ dgrp_t last_gr = ext2fs_group_of_blk2(fs, last_blk);
+
+ ext2fs_free_blocks_count_add(fs->super, -(blk64_t)(fs->inode_blocks_per_group));
+ for (; gr <= last_gr; ++gr) {
+ blk64_t gr_first_blk = ext2fs_group_first_block2(fs, gr);
+ blk64_t gr_last_blk = ext2fs_group_last_block2(fs, gr);
+ __u32 free_blocks = ext2fs_bg_free_blocks_count(fs, gr);
+ if (gr_first_blk < new_blk)
+ gr_first_blk = new_blk;
+ if (gr_last_blk > last_blk)
+ gr_last_blk = last_blk;
+
+ free_blocks -= (__u32)(gr_last_blk - gr_first_blk + 1);
+
+ ext2fs_bg_free_blocks_count_set(fs, gr, free_blocks);
+ ext2fs_bg_flags_clear(fs, gr, EXT2_BG_BLOCK_UNINIT);
ext2fs_group_desc_csum_set(fs, gr);
}
}
--
1.7.10.4
--
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