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Date: Thu, 21 Jul 2011 13:15:50 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: Yongqiang Yang <xiaoqiangnk@...il.com>
CC: linux-ext4@...r.kernel.org, tytso@....edu
Subject: [PATCH V3] e2fsprogs: add ext2fs_group_blocks_count helper
Code to count the number of blocks in the last partial
group is cut and pasted around the e2fsprogs codebase
a few times.
Making this a helper function should improve matters.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
V2: Sorry, first patch was against an old tree.
V3: Restore lost EXT2_BG_BLOCK_UNINIT in resize2fs.c
diff --git a/lib/ext2fs/alloc_sb.c b/lib/ext2fs/alloc_sb.c
index 09786a7..2e32389 100644
--- a/lib/ext2fs/alloc_sb.c
+++ b/lib/ext2fs/alloc_sb.c
@@ -74,15 +74,7 @@ int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
if (new_desc_blk)
ext2fs_mark_block_bitmap2(bmap, new_desc_blk);
- if (group == fs->group_desc_count-1) {
- num_blocks = (ext2fs_blocks_count(fs->super) -
- fs->super->s_first_data_block) %
- fs->super->s_blocks_per_group;
- if (!num_blocks)
- num_blocks = fs->super->s_blocks_per_group;
- } else
- num_blocks = fs->super->s_blocks_per_group;
-
+ num_blocks = ext2fs_group_blocks_count(fs, group);
num_blocks -= 2 + fs->inode_blocks_per_group + used_blks;
return num_blocks ;
diff --git a/lib/ext2fs/blknum.c b/lib/ext2fs/blknum.c
index b3e6dca..b9ac36c 100644
--- a/lib/ext2fs/blknum.c
+++ b/lib/ext2fs/blknum.c
@@ -43,6 +43,25 @@ blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group)
}
/*
+ * Return the number of blocks in a group
+ */
+int ext2fs_group_blocks_count(ext2_filsys fs, dgrp_t group)
+{
+ int num_blocks;
+
+ if (group == fs->group_desc_count - 1) {
+ num_blocks = (ext2fs_blocks_count(fs->super) -
+ fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
+ if (!num_blocks)
+ num_blocks = fs->super->s_blocks_per_group;
+ } else
+ num_blocks = fs->super->s_blocks_per_group;
+
+ return num_blocks;
+}
+
+/*
* Return the inode data block count
*/
blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c
index 952f496..51ef63c 100644
--- a/lib/ext2fs/closefs.c
+++ b/lib/ext2fs/closefs.c
@@ -152,14 +152,7 @@ int ext2fs_super_and_bgd_loc(ext2_filsys fs,
&ret_new_desc_blk2,
&ret_used_blks);
- if (group == fs->group_desc_count-1) {
- numblocks = (ext2fs_blocks_count(fs->super) -
- (blk64_t) fs->super->s_first_data_block) %
- (blk64_t) fs->super->s_blocks_per_group;
- if (!numblocks)
- numblocks = fs->super->s_blocks_per_group;
- } else
- numblocks = fs->super->s_blocks_per_group;
+ numblocks = ext2fs_group_blocks_count(fs, group);
if (ret_super_blk)
*ret_super_blk = (blk_t)ret_super_blk2;
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index dc83fb0..60a903a 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -757,6 +757,7 @@ extern errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
extern dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t);
extern blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group);
extern blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group);
+extern int ext2fs_group_blocks_count(ext2_filsys fs, dgrp_t group);
extern blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
struct ext2_inode *inode);
extern blk64_t ext2fs_inode_i_blocks(ext2_filsys fs,
diff --git a/resize/online.c b/resize/online.c
index 1d8d4ec..c2b98c6 100644
--- a/resize/online.c
+++ b/resize/online.c
@@ -135,12 +135,7 @@ errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
input.block_bitmap = ext2fs_block_bitmap_loc(new_fs, i);
input.inode_bitmap = ext2fs_inode_bitmap_loc(new_fs, i);
input.inode_table = ext2fs_inode_table_loc(new_fs, i);
- input.blocks_count = sb->s_blocks_per_group;
- if (i == new_fs->group_desc_count-1) {
- input.blocks_count = ext2fs_blocks_count(new_fs->super) -
- sb->s_first_data_block -
- (i * sb->s_blocks_per_group);
- }
+ input.blocks_count = ext2fs_group_blocks_count(new_fs, i);
input.reserved_blocks = (blk_t) (percent * input.blocks_count
/ 100.0);
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index 45ea5f4..59beb35 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -499,18 +499,10 @@ retry:
ext2fs_bg_flags_zap(fs, i);
if (csum_flag)
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT | EXT2_BG_INODE_ZEROED);
- if (i == fs->group_desc_count-1) {
- numblocks = (ext2fs_blocks_count(fs->super) -
- fs->super->s_first_data_block) %
- fs->super->s_blocks_per_group;
- if (!numblocks)
- numblocks = fs->super->s_blocks_per_group;
- } else {
- numblocks = fs->super->s_blocks_per_group;
- if (csum_flag)
- ext2fs_bg_flags_set(fs, i,
- EXT2_BG_BLOCK_UNINIT);
- }
+
+ numblocks = ext2fs_group_blocks_count(fs, i);
+ if ((i < fs->group_desc_count - 1) && csum_flag)
+ ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
has_super = ext2fs_bg_has_super(fs, i);
if (has_super) {
--
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