Message details and related content
Christoph Hellwig [off-list ref] writes:
This adds a flag that tells the file system that this is a high priority request for which it's worth to poll the hardware. The flag is purely advisory and can be ignored if not supported.
I'm not in love with the HIGHPRI name, but I don't have a better one in
mind. So...
Acked-by: Jeff Moyer <redacted>
quoted hunk
Signed-off-by: Christoph Hellwig <redacted> --- fs/read_write.c | 6 ++++-- include/linux/fs.h | 1 + include/uapi/linux/fs.h | 3 +++ 3 files changed, 8 insertions(+), 2 deletions(-)diff --git a/fs/read_write.c b/fs/read_write.c index 38b9afa..3b3fb22 100644 --- a/fs/read_write.c +++ b/fs/read_write.c@@ -697,10 +697,12 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, struct kiocb kiocb; ssize_t ret; - if (flags) + if (flags & ~RWF_HIPRI) return -EOPNOTSUPP; init_sync_kiocb(&kiocb, filp); + if (flags & RWF_HIPRI) + kiocb.ki_flags |= IOCB_HIPRI; kiocb.ki_pos = *ppos; ret = fn(&kiocb, iter);@@ -715,7 +717,7 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, { ssize_t ret = 0; - if (flags) + if (flags & ~RWF_HIPRI) return -EOPNOTSUPP; while (iov_iter_count(iter)) {diff --git a/include/linux/fs.h b/include/linux/fs.h index 875277a..a1f731c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h@@ -320,6 +320,7 @@ struct writeback_control;