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Commit e864f395 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 6aa657c8

fs/read_write.c

+5 −1
Original line number Diff line number Diff line
@@ -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);

include/uapi/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */