From d8aeb44a9ae324c4b823689fabb30b6621d93c88 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 7 Mar 2023 09:40:28 -0700 Subject: [PATCH] fs: add FMODE_DIO_PARALLEL_WRITE flag Some filesystems support multiple threads writing to the same file with O_DIRECT without requiring exclusive access to it. io_uring can use this hint to avoid serializing dio writes to this inode, instead allowing them to run in parallel. XFS and ext4 both fall into this category, so set the flag for both of them. Reviewed-by: Darrick J. Wong Signed-off-by: Jens Axboe --- fs/ext4/file.c | 3 ++- fs/xfs/xfs_file.c | 3 ++- include/linux/fs.h | 3 +++ 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 0b8b4499e5ca1..d101b3b0c7dad 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -899,7 +899,8 @@ static int ext4_file_open(struct inode *inode, struct file *filp) return ret; } - filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC; + filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | + FMODE_DIO_PARALLEL_WRITE; return dquot_file_open(inode, filp); } diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 705250f9f90a1..863289aaa4416 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1171,7 +1171,8 @@ xfs_file_open( { if (xfs_is_shutdown(XFS_M(inode->i_sb))) return -EIO; - file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC; + file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC | + FMODE_DIO_PARALLEL_WRITE; return generic_file_open(inode, file); } diff --git a/include/linux/fs.h b/include/linux/fs.h index c85916e9f7db5..475d88640d3d3 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -168,6 +168,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define FMODE_NOREUSE ((__force fmode_t)0x800000) +/* File supports non-exclusive O_DIRECT writes from multiple threads */ +#define FMODE_DIO_PARALLEL_WRITE ((__force fmode_t)0x1000000) + /* File was opened by fanotify and shouldn't generate fanotify events */ #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) -- 2.30.2