LU-16286 ldiskfs: reimplement nodelalloc optimization

fiemap calls perform costly delayed extent search affecting
BRW performance, however, in Lustre we don't use delayed
allocation at all. Let's skip this search completely as we did
in RHEL7.

Change-Id: I2c3562cf5cbdf3c5532e4b79b28a040a995322b7
Signed-off-by: Andrew Perepechko <andrew.perepechko@hpe.com>
HPE-bug-id: LUS-11161
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49007
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>

diff --git a/ldiskfs/kernel_patches/patches/rhel8.4/ext4-optimize-find_delayed_extent.patch b/ldiskfs/kernel_patches/patches/rhel8.4/ext4-optimize-find_delayed_extent.patch
new file mode 100644 (file)
index 0000000..a6b156a
--- /dev/null
+++ b/ldiskfs/kernel_patches/patches/rhel8.4/ext4-optimize-find_delayed_extent.patch
@@ -0,0 +1,16 @@
+--- linux-stage.orig/fs/ext4/extents.c 2022-09-05 09:04:31.628122705 -0600
++++ linux-stage/fs/ext4/extents.c      2022-09-06 05:32:57.083369853 -0600
+@@ -5064,6 +5064,13 @@ static int ext4_find_delayed_extent(s
+       struct extent_status es;
+       ext4_lblk_t block, next_del;
+ 
++      if (!test_opt(inode->i_sb, DELALLOC)) {
++              if (newes->es_pblk == 0)
++                      return 0;
++
++              return EXT_MAX_BLOCKS;
++      }
++
+       if (newes->es_pblk == 0) {
+               ext4_es_find_extent_range(inode, &ext4_es_is_delayed,
+                                         newes->es_lblk,

diff --git a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.4.series b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.4.series
index 2fe189e..4cf9472 100644 (file)
--- a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.4.series
+++ b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.4.series
@@ -32,3 +32,4 @@ rhel8.4/ext4-enc-flag.patch
 base/ext4-delayed-iput.patch
 rhel8.5/ext4-filename-encode.patch
 rhel8/ext4-old_ea_inodes_handling_fix.patch
+rhel8.4/ext4-optimize-find_delayed_extent.patch

diff --git a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.5.series b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.5.series
index 58634b1..a4237d2 100644 (file)
--- a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.5.series
+++ b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.5.series
@@ -32,3 +32,4 @@ rhel8.5/ext4-enc-flag.patch
 base/ext4-delayed-iput.patch
 rhel8.5/ext4-filename-encode.patch
 rhel8/ext4-old_ea_inodes_handling_fix.patch
+rhel8.4/ext4-optimize-find_delayed_extent.patch

diff --git a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.6.series b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.6.series
index 58634b1..a4237d2 100644 (file)
--- a/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.6.series
+++ b/ldiskfs/kernel_patches/series/ldiskfs-4.18-rhel8.6.series
@@ -32,3 +32,4 @@ rhel8.5/ext4-enc-flag.patch
 base/ext4-delayed-iput.patch
 rhel8.5/ext4-filename-encode.patch
 rhel8/ext4-old_ea_inodes_handling_fix.patch
+rhel8.4/ext4-optimize-find_delayed_extent.patch