[PATCH 05/47] libext2fs: set BLOCK_UNINIT for non-last blockgroups if all blocks are free

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Set BLOCK_UNINIT in any group whose blocks are all unused, so long as
it isn't the last group.  This helps us speed up future e2fsck runs
and mounts because we don't need to read or checksum block bitmaps for
these groups.

v2: Take care of this in the library, since e2fsck always updates these
summary counts.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 lib/ext2fs/csum.c |    5 +++++
 1 file changed, 5 insertions(+)


diff --git a/lib/ext2fs/csum.c b/lib/ext2fs/csum.c
index 12f6fe9..6dcefb9 100644
--- a/lib/ext2fs/csum.c
+++ b/lib/ext2fs/csum.c
@@ -854,6 +854,11 @@ errcode_t ext2fs_set_gdt_csum(ext2_filsys fs)
 		__u32 old_unused = ext2fs_bg_itable_unused(fs, i);
 		__u32 old_flags = ext2fs_bg_flags(fs, i);
 		__u32 old_free_inodes_count = ext2fs_bg_free_inodes_count(fs, i);
+		__u32 old_free_blocks_count = ext2fs_bg_free_blocks_count(fs, i);
+
+		if (old_free_blocks_count == sb->s_blocks_per_group &&
+		    i != fs->group_desc_count - 1)
+			ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
 
 		if (old_free_inodes_count == sb->s_inodes_per_group) {
 			ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux