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| author | Dan Williams <dan.j.williams@intel.com> | 2017-05-29 13:02:52 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-06-15 14:34:59 -0700 |
| commit | abebfbe2f7315dd3ec9a0c69596a76e32beb5749 (patch) | |
| tree | e0b8a531424d7625e19a82a9151fa64a0a30671b /drivers/md/dm-stripe.c | |
| parent | 3c1cebff23cdca01c421411e953a9e239f2b9ef9 (diff) | |
| download | linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.tar.gz | |
dm: add ->flush() dax operation support
Allow device-mapper to route flush operations to the
per-target implementation. In order for the device stacking to work we
need a dax_dev and a pgoff relative to that device. This gives each
layer of the stack the information it needs to look up the operation
pointer for the next level.
This conceptually allows for an array of mixed device drivers with
varying flush implementations.
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/dm-stripe.c')
| -rw-r--r-- | drivers/md/dm-stripe.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 1ef914f9ca72cf..8e73517967b653 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -351,6 +351,25 @@ static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); } +static void stripe_dax_flush(struct dm_target *ti, pgoff_t pgoff, void *addr, + size_t size) +{ + sector_t dev_sector, sector = pgoff * PAGE_SECTORS; + struct stripe_c *sc = ti->private; + struct dax_device *dax_dev; + struct block_device *bdev; + uint32_t stripe; + + stripe_map_sector(sc, sector, &stripe, &dev_sector); + dev_sector += sc->stripe[stripe].physical_start; + dax_dev = sc->stripe[stripe].dev->dax_dev; + bdev = sc->stripe[stripe].dev->bdev; + + if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(size, PAGE_SIZE), &pgoff)) + return; + dax_flush(dax_dev, pgoff, addr, size); +} + /* * Stripe status: * @@ -471,6 +490,7 @@ static struct target_type stripe_target = { .io_hints = stripe_io_hints, .direct_access = stripe_dax_direct_access, .dax_copy_from_iter = stripe_dax_copy_from_iter, + .dax_flush = stripe_dax_flush, }; int __init dm_stripe_init(void) |