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fs: add FMODE_DIO_PARALLEL_WRITE flag 

JIRA: https://issues.redhat.com/browse/RHEL-12076

commit d8aeb44a9ae324c4b823689fabb30b6621d93c88
Author: Jens Axboe <axboe@kernel.dk>
Date:   Tue Mar 7 09:40:28 2023 -0700

    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 <djwong@kernel.org>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
This commit is contained in:
Jeff Moyer 2023-03-07 09:40:28 -07:00
parent 21ad2bca33
commit beaafcc2c0
3 changed files with 7 additions and 2 deletions
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3
fs/ext4/file.c
View File

@ -900,7 +900,8 @@ 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);
}

3
fs/xfs/xfs_file.c
View File

@ -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);
}

3
include/linux/fs.h
View File

@ -159,6 +159,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
/* File supports DIRECT IO */
#define FMODE_CAN_ODIRECT ((__force fmode_t)0x400000)
/* 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)