linux-toradex.git/drivers/md/dm-linear.c, branch v5.17

dax: remove the copy_from_iter and copy_to_iter methods

2021-12-18T16:04:53+00:00

These methods indirect the actual DAX read/write path.  In the end pmem
uses magic flush and mc safe variants and fuse and dcssblk use plain ones
while device mapper picks redirects to the underlying device.

Add set_dax_nocache() and set_dax_nomc() APIs to control which copy
routines are used to remove indirect call from the read/write fast path
as well as a lot of boilerplate code.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Vivek Goyal  [virtiofs]
Link: https://lore.kernel.org/r/20211215084508.435401-5-hch@lst.de
Signed-off-by: Dan Williams

dm-linear: add a linear_dax_pgoff helper

2021-12-04T16:58:51+00:00

Add a helper to perform the entire remapping for DAX accesses.  This
helper open codes bdev_dax_pgoff given that the alignment checks have
already been done by the submitting file system and don't need to be
repeated.

Signed-off-by: Christoph Hellwig 
Acked-by: Mike Snitzer 
Reviewed-by: Dan Williams 
Link: https://lore.kernel.org/r/20211129102203.2243509-10-hch@lst.de
Signed-off-by: Dan Williams

dm: make the DAX support depend on CONFIG_FS_DAX

2021-12-04T16:58:50+00:00

The device mapper DAX support is all hanging off a block device and thus
can't be used with device dax.  Make it depend on CONFIG_FS_DAX instead
of CONFIG_DAX_DRIVER.  This also means that bdev_dax_pgoff only needs to
be built under CONFIG_FS_DAX now.

Signed-off-by: Christoph Hellwig 
Acked-by: Mike Snitzer 
Link: https://lore.kernel.org/r/20211129102203.2243509-3-hch@lst.de
Signed-off-by: Dan Williams

dm: use bdev_nr_sectors and bdev_nr_bytes instead of open coding them

2021-10-18T20:43:22+00:00

Use the proper helpers to read the block device size.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Kees Cook 
Acked-by: Mike Snitzer 
Link: https://lore.kernel.org/r/20211018101130.1838532-6-hch@lst.de
Signed-off-by: Jens Axboe

dm: update target status functions to support IMA measurement

2021-08-10T17:34:23+00:00

For device mapper targets to take advantage of IMA's measurement
capabilities, the status functions for the individual targets need to be
updated to handle the status_type_t case for value STATUSTYPE_IMA.

Update status functions for the following target types, to log their
respective attributes to be measured using IMA.
 01. cache
 02. crypt
 03. integrity
 04. linear
 05. mirror
 06. multipath
 07. raid
 08. snapshot
 09. striped
 10. verity

For rest of the targets, handle the STATUSTYPE_IMA case by setting the
measurement buffer to NULL.

For IMA to measure the data on a given system, the IMA policy on the
system needs to be updated to have the following line, and the system
needs to be restarted for the measurements to take effect.

/etc/ima/ima-policy
 measure func=CRITICAL_DATA label=device-mapper template=ima-buf

The measurements will be reflected in the IMA logs, which are located at:

/sys/kernel/security/integrity/ima/ascii_runtime_measurements
/sys/kernel/security/integrity/ima/binary_runtime_measurements

These IMA logs can later be consumed by various attestation clients
running on the system, and send them to external services for attesting
the system.

The DM target data measured by IMA subsystem can alternatively
be queried from userspace by setting DM_IMA_MEASUREMENT_FLAG with
DM_TABLE_STATUS_CMD.

Signed-off-by: Tushar Sugandhi 
Signed-off-by: Mike Snitzer

dm: Introduce dm_report_zones()

2021-06-04T16:07:32+00:00

To simplify the implementation of the report_zones operation of a zoned
target, introduce the function dm_report_zones() to set a target
mapping start sector in struct dm_report_zones_args and call
blkdev_report_zones(). This new function is exported and the report
zones callback function dm_report_zones_cb() is not.

dm-linear, dm-flakey and dm-crypt are modified to use dm_report_zones().

Signed-off-by: Damien Le Moal 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Hannes Reinecke 
Reviewed-by: Himanshu Madhani 
Signed-off-by: Mike Snitzer

dm: simplify target code conditional on CONFIG_BLK_DEV_ZONED

2021-02-11T14:45:27+00:00

Allow removal of CONFIG_BLK_DEV_ZONED conditionals in target_type
definition of various targets.

Suggested-by: Eric Biggers 
Signed-off-by: Mike Snitzer

dm: set DM_TARGET_PASSES_CRYPTO feature for some targets

2021-02-11T14:45:26+00:00

dm-linear and dm-flakey obviously can pass through inline crypto support.

Co-developed-by: Eric Biggers 
Signed-off-by: Eric Biggers 
Signed-off-by: Satya Tangirala 
Signed-off-by: Mike Snitzer

dm: add support for REQ_NOWAIT and enable it for linear target

2020-09-25T14:20:03+00:00

Add DM target feature flag DM_TARGET_NOWAIT which advertises that
target works with REQ_NOWAIT bios.

Add dm_table_supports_nowait() and update dm_table_set_restrictions()
to set/clear QUEUE_FLAG_NOWAIT accordingly.

Signed-off-by: Konstantin Khlebnikov 
Signed-off-by: Mike Snitzer 
Signed-off-by: Jens Axboe

dm,dax: Add dax zero_page_range operation

2020-04-03T02:15:03+00:00

This patch adds support for dax zero_page_range operation to dm targets.

Signed-off-by: Vivek Goyal 
Acked-by: Mike Snitzer 
Link: https://lore.kernel.org/r/20200228163456.1587-5-vgoyal@redhat.com
Signed-off-by: Dan Williams