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Commit 85c8f176 authored by Andrew Perepechko's avatar Andrew Perepechko Committed by Theodore Ts'o
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ext4: preload block group descriptors 



With enabled meta_bg option block group descriptors
reading IO is not sequential and requires optimization.

Signed-off-by: default avatarAndrew Perepechko <andrew.perepechko@seagate.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 1a20a630

fs/ext4/super.c

+6 −0
Original line number Diff line number Diff line
@@ -3879,6 +3879,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) 


	bgl_lock_init(sbi->s_blockgroup_lock);



	/* Pre-read the descriptors into the buffer cache */

	for (i = 0; i < db_count; i++) {

		block = descriptor_loc(sb, logical_sb_block, i);

		sb_breadahead(sb, block);

	}



	for (i = 0; i < db_count; i++) {

		block = descriptor_loc(sb, logical_sb_block, i);

		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);