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resize2fs: grow uninit_bg file systems more efficiently

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If the uninit_bg feature is enabled and the kernel supports
lazy_itable_init, skip zeroing the inode table so that the resize
operation can go much more quickly.  Also set the itable_unused fields
so that the first e2fsck after the resize will run faster.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2012-09-13 18:17:27 -04:00
parent 06ca8da745
commit 2d8c0c8a4f
1 changed files with 25 additions and 3 deletions
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28
resize/resize2fs.c
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@ -62,6 +62,8 @@ static errcode_t fix_sb_journal_backup(ext2_filsys fs);
((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
(fs)->inode_blocks_per_group)))
int lazy_itable_init;
/*
* This is the top-level routine which does the dirty deed....
*/
@ -480,6 +482,8 @@ retry:
csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
if (access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
lazy_itable_init = 1;
adj = old_fs->group_desc_count;
max_group = fs->group_desc_count - adj;
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
@ -494,8 +498,14 @@ retry:
adjblocks = 0;
ext2fs_bg_flags_zap(fs, i);
if (csum_flag)
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT | EXT2_BG_INODE_ZEROED);
if (csum_flag) {
ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
if (!lazy_itable_init)
ext2fs_bg_flags_set(fs, i,
EXT2_BG_INODE_ZEROED);
ext2fs_bg_itable_unused_set(fs, i,
fs->super->s_inodes_per_group);
}
numblocks = ext2fs_group_blocks_count(fs, i);
if ((i < fs->group_desc_count - 1) && csum_flag)
@ -608,7 +618,19 @@ static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
}
/*
* Initialize the new block group descriptors
* If we are using uninit_bg (aka GDT_CSUM) and the kernel
* supports lazy inode initialization, we can skip
* initializing the inode table.
*/
if (lazy_itable_init &&
EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
retval = 0;
goto errout;
}
/*
* Initialize the inode table
*/
retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
&rfs->itable_buf);