From: Saugata Das <saugata.das@xxxxxxxxxx>
Today, storage devices like eMMC has special features like data tagging
(introduced in MMC-4.5 version) in order to improve performance of some
specific writes. On MMC stack, data tagging is used for all writes which has
REQ_META flag set. On EXT4, however, currently REQ_META is set only for read.
This patch adds the capability mark a meta-data buffer with set_buffer_meta
during meta data write. During submit_bh, this information is used to set
REQ_META flag.
Signed-off-by: Saugata Das <saugata.das@xxxxxxxxxx>
---
fs/ext4/ext4_jbd2.c | 4 ++++
fs/ext4/inode.c | 4 +++-
2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index aca1790..097c062 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -107,6 +107,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
{
int err = 0;
+ set_buffer_meta(bh);
+
if (ext4_handle_valid(handle)) {
err = jbd2_journal_dirty_metadata(handle, bh);
if (err) {
@@ -143,6 +145,8 @@ int __ext4_handle_dirty_super(const char *where, unsigned int line,
struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
int err = 0;
+ set_buffer_meta(bh);
+
if (ext4_handle_valid(handle)) {
err = jbd2_journal_dirty_metadata(handle, bh);
if (err)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c77b0bd..754fe77 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4035,8 +4035,10 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
err = __ext4_get_inode_loc(inode, &iloc, 0);
if (err)
return err;
- if (wbc->sync_mode == WB_SYNC_ALL)
+ if (wbc->sync_mode == WB_SYNC_ALL) {
+ set_buffer_meta(iloc.bh);
sync_dirty_buffer(iloc.bh);
+ }
if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr,
"IO error syncing inode");
--
1.7.4.3
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