From: Zhengxu Zhang <zhengxu.zhang@xxxxxxxxxx>
Test: androbench by default setting, use 64GB sdcard.
the random write speed:
without this patch 3.5MB/s
with this patch 7MB/s
After patch "11a347fb6cef", the random write speed decreased significantly.
the .write_iter() interface had been modified, and check the differences with
generic_file_write_iter(), when calling generic_rite_sync() and
exfat_file_write_iter() to call vfs_fsync_range(), the fdatasync flag is wrong,
and make not use the fdatasync mode, and make random write speed decreased.
so make the fdatasync flag like generic_write_sync().
Fixes: 11a347fb6cef ("exfat: change to get file size from DataLength")
Signed-off-by: Zhengxu Zhang <zhengxu.zhang@xxxxxxxxxx>
---
fs/exfat/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 841a5b18e3df..01d983fa7f55 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -625,7 +625,7 @@ static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
- iocb->ki_flags & IOCB_SYNC);
+ (iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
if (err < 0)
return err;
}
--
2.25.1
