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@xxxxxx>
---
fs/read_write.c | 6 +++++-
include/uapi/linux/fs.h | 2 ++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index cf377cf..3729d8d 100644
--- 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
--- 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 */
--
2.1.4
--
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