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    SubjectRe: [PATCH RFC 1/8] block: Introduce provisioning primitives
    On Thu, Sep 15 2022 at 12:48P -0400,
    Sarthak Kukreti <sarthakkukreti@chromium.org> wrote:

    > From: Sarthak Kukreti <sarthakkukreti@chromium.org>
    >
    > Introduce block request REQ_OP_PROVISION. The intent of this request
    > is to request underlying storage to preallocate disk space for the given
    > block range. Block device that support this capability will export
    > a provision limit within their request queues.
    >
    > Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
    > ---
    > block/blk-core.c | 5 ++++
    > block/blk-lib.c | 55 +++++++++++++++++++++++++++++++++++++++
    > block/blk-merge.c | 17 ++++++++++++
    > block/blk-settings.c | 19 ++++++++++++++
    > block/blk-sysfs.c | 8 ++++++
    > block/bounce.c | 1 +
    > include/linux/bio.h | 6 +++--
    > include/linux/blk_types.h | 5 +++-
    > include/linux/blkdev.h | 16 ++++++++++++
    > 9 files changed, 129 insertions(+), 3 deletions(-)
    >
    > diff --git a/block/blk-settings.c b/block/blk-settings.c
    > index 8bb9eef5310e..be79ad68b330 100644
    > --- a/block/blk-settings.c
    > +++ b/block/blk-settings.c
    > @@ -57,6 +57,7 @@ void blk_set_default_limits(struct queue_limits *lim)
    > lim->misaligned = 0;
    > lim->zoned = BLK_ZONED_NONE;
    > lim->zone_write_granularity = 0;
    > + lim->max_provision_sectors = 0;
    > }
    > EXPORT_SYMBOL(blk_set_default_limits);
    >
    > @@ -81,6 +82,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
    > lim->max_dev_sectors = UINT_MAX;
    > lim->max_write_zeroes_sectors = UINT_MAX;
    > lim->max_zone_append_sectors = UINT_MAX;
    > + lim->max_provision_sectors = UINT_MAX;
    > }
    > EXPORT_SYMBOL(blk_set_stacking_limits);
    >

    Please work through the blk_stack_limits() implementation too (simple
    min_not_zero?).

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