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ext4: preload block group descriptors

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

Signed-off-by: Andrew Perepechko <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
This commit is contained in:
Andrew Perepechko authored and Theodore Ts'o committed 2017-04-30 00:46:35 -04:00
1 parent 1a20a63084
commit 85c8f176a6
1 file changed
+6
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fs/ext4/super.c
+6
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@@ -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);