vfs: add the RWF_HIPRI flag for preadv2/pwritev2
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. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stephen Bates <stephen.bates@pmcs.com> Tested-by: Stephen Bates <stephen.bates@pmcs.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -697,10 +697,12 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
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struct kiocb kiocb;
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struct kiocb kiocb;
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ssize_t ret;
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ssize_t ret;
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if (flags)
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if (flags & ~RWF_HIPRI)
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return -EOPNOTSUPP;
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return -EOPNOTSUPP;
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init_sync_kiocb(&kiocb, filp);
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init_sync_kiocb(&kiocb, filp);
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if (flags & RWF_HIPRI)
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kiocb.ki_flags |= IOCB_HIPRI;
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kiocb.ki_pos = *ppos;
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kiocb.ki_pos = *ppos;
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ret = fn(&kiocb, iter);
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ret = fn(&kiocb, iter);
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@ -715,7 +717,7 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
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{
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{
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ssize_t ret = 0;
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ssize_t ret = 0;
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if (flags)
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if (flags & ~RWF_HIPRI)
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return -EOPNOTSUPP;
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return -EOPNOTSUPP;
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while (iov_iter_count(iter)) {
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while (iov_iter_count(iter)) {
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@ -320,6 +320,7 @@ struct writeback_control;
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#define IOCB_EVENTFD (1 << 0)
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#define IOCB_EVENTFD (1 << 0)
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#define IOCB_APPEND (1 << 1)
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#define IOCB_APPEND (1 << 1)
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#define IOCB_DIRECT (1 << 2)
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#define IOCB_DIRECT (1 << 2)
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#define IOCB_HIPRI (1 << 3)
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struct kiocb {
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struct kiocb {
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struct file *ki_filp;
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struct file *ki_filp;
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@ -305,4 +305,7 @@ struct fsxattr {
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#define SYNC_FILE_RANGE_WRITE 2
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#define SYNC_FILE_RANGE_WRITE 2
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#define SYNC_FILE_RANGE_WAIT_AFTER 4
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#define SYNC_FILE_RANGE_WAIT_AFTER 4
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/* flags for preadv2/pwritev2: */
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#define RWF_HIPRI 0x00000001 /* high priority request, poll if possible */
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#endif /* _UAPI_LINUX_FS_H */
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#endif /* _UAPI_LINUX_FS_H */
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