6.15-stable review patch. If anyone has any objections, please let me know.
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From: Zhengxu Zhang zhengxu.zhang@unisoc.com
[ Upstream commit 2f2d42a17b5a6711378d39df74f1f69a831c5d4e ]
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_write_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 use generic_write_sync() instead of vfs_fsync_range().
Fixes: 11a347fb6cef ("exfat: change to get file size from DataLength") Signed-off-by: Zhengxu Zhang zhengxu.zhang@unisoc.com Acked-by: Yuezhang Mo Yuezhang.Mo@sony.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/exfat/file.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/fs/exfat/file.c b/fs/exfat/file.c index 841a5b18e3df..7ac5126aa4f1 100644 --- a/fs/exfat/file.c +++ b/fs/exfat/file.c @@ -623,9 +623,8 @@ static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter) if (pos > valid_size) pos = valid_size;
- 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); + if (iocb->ki_pos > pos) { + ssize_t err = generic_write_sync(iocb, iocb->ki_pos - pos); if (err < 0) return err; }