The patch titled
Subject: DAX: enable iostat for read/write
has been added to the -mm tree. Its filename is
dax-enable-iostat-for-read-write.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dax-enable-iostat-for-read-write.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dax-enable-iostat-for-read-write.patch
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------------------------------------------------------
From: Toshi Kani <toshi.kani@xxxxxxx>
Subject: DAX: enable iostat for read/write
DAX IO path does not support iostat, but its metadata IO path does.
Therefore, iostat shows metadata IO statistics only, which has been
confusing to users.
Add iostat support to the DAX read/write path.
Note, iostat still does not support the DAX mmap path as it allows user
applications to access directly.
Link: http://lkml.kernel.org/r/20170113233418.32252-1-toshi.kani@xxxxxxx
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN fs/dax.c~dax-enable-iostat-for-read-write fs/dax.c
--- a/fs/dax.c~dax-enable-iostat-for-read-write
+++ a/fs/dax.c
@@ -1081,12 +1081,24 @@ dax_iomap_rw(struct kiocb *iocb, struct
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
+ struct gendisk *disk = inode->i_sb->s_bdev->bd_disk;
loff_t pos = iocb->ki_pos, ret = 0, done = 0;
unsigned flags = 0;
+ unsigned long start = 0;
+ int do_acct = blk_queue_io_stat(disk->queue);
if (iov_iter_rw(iter) == WRITE)
flags |= IOMAP_WRITE;
+ if (do_acct) {
+ size_t sec = iov_iter_count(iter) >> 9;
+
+ start = jiffies;
+ generic_start_io_acct(iov_iter_rw(iter),
+ max_t(unsigned long, 1, sec),
+ &disk->part0);
+ }
+
while (iov_iter_count(iter)) {
ret = iomap_apply(inode, pos, iov_iter_count(iter), flags, ops,
iter, dax_iomap_actor);
@@ -1096,6 +1108,9 @@ dax_iomap_rw(struct kiocb *iocb, struct
done += ret;
}
+ if (do_acct)
+ generic_end_io_acct(iov_iter_rw(iter), &disk->part0, start);
+
iocb->ki_pos += done;
return done ? done : ret;
}
_
Patches currently in -mm which might be from toshi.kani@xxxxxxx are
dax-enable-iostat-for-read-write.patch
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