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| author | Dan Williams | 2017-05-29 22:02:52 +0200 |
|---|---|---|
| committer | Dan Williams | 2017-06-15 23:34:59 +0200 |
| commit | abebfbe2f7315dd3ec9a0c69596a76e32beb5749 (patch) | |
| tree | e0b8a531424d7625e19a82a9151fa64a0a30671b /drivers/md/dm-linear.c | |
| parent | dax, pmem: introduce an optional 'flush' dax_operation (diff) | |
| download | kernel-qcow2-linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.tar.gz kernel-qcow2-linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.tar.xz kernel-qcow2-linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.zip | |
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-linear.c')
| -rw-r--r-- | drivers/md/dm-linear.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 0841ec1bfbad..25e661974319 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -173,6 +173,20 @@ static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); } +static void linear_dax_flush(struct dm_target *ti, pgoff_t pgoff, void *addr, + size_t size) +{ + struct linear_c *lc = ti->private; + struct block_device *bdev = lc->dev->bdev; + struct dax_device *dax_dev = lc->dev->dax_dev; + sector_t dev_sector, sector = pgoff * PAGE_SECTORS; + + dev_sector = linear_map_sector(ti, sector); + if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(size, PAGE_SIZE), &pgoff)) + return; + dax_flush(dax_dev, pgoff, addr, size); +} + static struct target_type linear_target = { .name = "linear", .version = {1, 3, 0}, @@ -186,6 +200,7 @@ static struct target_type linear_target = { .iterate_devices = linear_iterate_devices, .direct_access = linear_dax_direct_access, .dax_copy_from_iter = linear_dax_copy_from_iter, + .dax_flush = linear_dax_flush, }; int __init dm_linear_init(void) |