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authorAndrew Perepechko <andrew.perepechko@seagate.com>2017-04-30 00:46:35 -0400
committerTheodore Ts'o <tytso@mit.edu>2017-04-30 00:46:35 -0400
commit85c8f176a6111ecde9c158109989dbd445a0e59a (patch)
tree6bdbf361508bb0159e9e13198424a517ff251d1d /fs/ext4
parent1a20a63084be8fc5b0c1191231dfd311f7fc2afa (diff)
ext4: preload block group descriptors
With enabled meta_bg option block group descriptors reading IO is not sequential and requires optimization. Signed-off-by: Andrew Perepechko <andrew.perepechko@seagate.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/super.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9ec8963ba604..9a40e0c16dcc 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -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);