fs: add RWF_DSYNC aand RWF_SYNC

This is the per-I/O equivalent of O_DSYNC and O_SYNC, and very useful for
all kinds of file servers and storage targets.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/read_write.c b/fs/read_write.c
index cf377cf..3729d8d 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -698,12 +698,16 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
        struct kiocb kiocb;
        ssize_t ret;
 
-       if (flags & ~RWF_HIPRI)
+       if (flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC))
                return -EOPNOTSUPP;
 
        init_sync_kiocb(&kiocb, filp);
        if (flags & RWF_HIPRI)
                kiocb.ki_flags |= IOCB_HIPRI;
+       if (flags & RWF_DSYNC)
+               kiocb.ki_flags |= IOCB_DSYNC;
+       if (flags & RWF_SYNC)
+               kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
        kiocb.ki_pos = *ppos;
 
        ret = fn(&kiocb, iter);

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index a079d50..e21fe04 100644 (file)
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -324,5 +324,7 @@ struct fscrypt_policy {
 
 /* flags for preadv2/pwritev2: */
 #define RWF_HIPRI                      0x00000001 /* high priority request, poll if possible */
+#define RWF_DSYNC                      0x00000002 /* per-IO O_DSYNC */
+#define RWF_SYNC                       0x00000004 /* per-IO O_SYNC */
 
 #endif /* _UAPI_LINUX_FS_H */