Commit 6f607174 authored by Fam Zheng's avatar Fam Zheng Committed by Kevin Wolf
Browse files

raw-posix: Fetch max sectors for host block device 



This is sometimes a useful value we should count in.

Signed-off-by: default avatarFam Zheng <famz@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 107d433c

block/raw-posix.c

+24 −0
Original line number Diff line number Diff line
@@ -729,9 +729,33 @@ static void raw_reopen_abort(BDRVReopenState *state) 
    state->opaque = NULL;

}



static int hdev_get_max_transfer_length(int fd)

{

#ifdef BLKSECTGET

    int max_sectors = 0;

    if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) {

        return max_sectors;

    } else {

        return -errno;

    }

#else

    return -ENOSYS;

#endif

}



static void raw_refresh_limits(BlockDriverState *bs, Error **errp)

{

    BDRVRawState *s = bs->opaque;

    struct stat st;



    if (!fstat(s->fd, &st)) {

        if (S_ISBLK(st.st_mode)) {

            int ret = hdev_get_max_transfer_length(s->fd);

            if (ret >= 0) {

                bs->bl.max_transfer_length = ret;

            }

        }

    }



    raw_probe_alignment(bs, s->fd, errp);

    bs->bl.min_mem_alignment = s->buf_align;