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fs: add RWF_DSYNC aand RWF_SYNC

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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>
This commit is contained in:
Christoph Hellwig 2016-04-07 08:52:03 -07:00 committed by Al Viro
parent 6aa657c852
commit e864f39569
2 changed files with 7 additions and 1 deletions
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6
fs/read_write.c
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@ -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);

2
include/uapi/linux/fs.h
View File

@ -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 */