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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-29 13:33:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-29 13:33:53 -0800
commita4b7fd7d34de5765dece2dd08060d2e1f7be3b39 (patch)
tree891c72db66e49054dde6dcf6d710afde25775d73 /fs/ext4/namei.c
parentd1de762e36375e1e1cd41f7f93c298ac62d831a7 (diff)
parentf02a9ad1f15daf4378afeda025a53455f72645dd (diff)
downloadlinux-stericsson-a4b7fd7d34de5765dece2dd08060d2e1f7be3b39.tar.gz
Merge tag 'iversion-v4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux
Pull inode->i_version rework from Jeff Layton: "This pile of patches is a rework of the inode->i_version field. We have traditionally incremented that field on every inode data or metadata change. Typically this increment needs to be logged on disk even when nothing else has changed, which is rather expensive. It turns out though that none of the consumers of that field actually require this behavior. The only real requirement for all of them is that it be different iff the inode has changed since the last time the field was checked. Given that, we can optimize away most of the i_version increments and avoid dirtying inode metadata when the only change is to the i_version and no one is querying it. Queries of the i_version field are rather rare, so we can help write performance under many common workloads. This patch series converts existing accesses of the i_version field to a new API, and then converts all of the in-kernel filesystems to use it. The last patch in the series then converts the backend implementation to a scheme that optimizes away a large portion of the metadata updates when no one is looking at it. In my own testing this series significantly helps performance with small I/O sizes. I also got this email for Christmas this year from the kernel test robot (a 244% r/w bandwidth improvement with XFS over DAX, with 4k writes): https://lkml.org/lkml/2017/12/25/8 A few of the earlier patches in this pile are also flowing to you via other trees (mm, integrity, and nfsd trees in particular)". * tag 'iversion-v4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux: (22 commits) fs: handle inode->i_version more efficiently btrfs: only dirty the inode in btrfs_update_time if something was changed xfs: avoid setting XFS_ILOG_CORE if i_version doesn't need incrementing fs: only set S_VERSION when updating times if necessary IMA: switch IMA over to new i_version API xfs: convert to new i_version API ufs: use new i_version API ocfs2: convert to new i_version API nfsd: convert to new i_version API nfs: convert to new i_version API ext4: convert to new i_version API ext2: convert to new i_version API exofs: switch to new i_version API btrfs: convert to new i_version API afs: convert to new i_version API affs: convert to new i_version API fat: convert to new i_version API fs: don't take the i_lock in inode_inc_iversion fs: new API for handling inode->i_version ntfs: remove i_version handling ...
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index e750d68fbcb5..6660686e505a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -34,6 +34,7 @@
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
+#include <linux/iversion.h>
#include "ext4.h"
#include "ext4_jbd2.h"
@@ -2959,7 +2960,7 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
"empty directory '%.*s' has too many links (%u)",
dentry->d_name.len, dentry->d_name.name,
inode->i_nlink);
- inode->i_version++;
+ inode_inc_iversion(inode);
clear_nlink(inode);
/* There's no need to set i_disksize: the fact that i_nlink is
* zero will ensure that the right thing happens during any
@@ -3365,7 +3366,7 @@ static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
ent->de->inode = cpu_to_le32(ino);
if (ext4_has_feature_filetype(ent->dir->i_sb))
ent->de->file_type = file_type;
- ent->dir->i_version++;
+ inode_inc_iversion(ent->dir);
ent->dir->i_ctime = ent->dir->i_mtime =
current_time(ent->dir);
ext4_mark_inode_dirty(handle, ent->dir);