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authorChristoph Hellwig <hch@lst.de>2016-04-07 08:52:03 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-01 19:58:39 -0400
commite864f39569f4092c2b2bc72c773b6e486c7e3bd9 (patch)
tree4e2cadd87c25718956f26f11771ae9bf669ab380
parent6aa657c8526b8bbab6287f02dd91ac6d0c392d19 (diff)
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>
-rw-r--r--fs/read_write.c6
-rw-r--r--include/uapi/linux/fs.h2
2 files changed, 7 insertions, 1 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index cf377cf9dfe3..3729d8d34797 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 a079d50376e1..e21fe04acc12 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 */