kernel.git/drivers/md/dm-ebs-target.c, branch linux-5.16.y

dm: use bdev_nr_sectors and bdev_nr_bytes instead of open coding them

2021-10-18T20:43:22Z

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

Merge tag 'for-5.15/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

2021-08-31T21:55:09Z

Pull device mapper updates from Mike Snitzer: - Add DM infrastructure for IMA-based remote attestion. These changes are the basis for deploying DM-based storage in a "cloud" that must validate configurations end-users run to maintain trust. These DM changes allow supported DM targets' configurations to be measured via IMA. But the policy and enforcement (of which configurations are valid) is managed by something outside the kernel (e.g. Keylime). - Fix DM crypt scalability regression on systems with many cpus due to percpu_counter spinlock contention in crypt_page_alloc(). - Use in_hardirq() instead of deprecated in_irq() in DM crypt. - Add event counters to DM writecache to allow users to further assess how the writecache is performing. - Various code cleanup in DM writecache's main IO mapping function. * tag 'for-5.15/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm crypt: use in_hardirq() instead of deprecated in_irq() dm ima: update dm documentation for ima measurement support dm ima: update dm target attributes for ima measurements dm ima: add a warning in dm_init if duplicate ima events are not measured dm ima: prefix ima event name related to device mapper with dm_ dm ima: add version info to dm related events in ima log dm ima: prefix dm table hashes in ima log with hash algorithm dm crypt: Avoid percpu_counter spinlock contention in crypt_page_alloc() dm: add documentation for IMA measurement support dm: update target status functions to support IMA measurement dm ima: measure data on device rename dm ima: measure data on table clear dm ima: measure data on device remove dm ima: measure data on device resume dm ima: measure data on table load dm writecache: add event counters dm writecache: report invalid return from writecache_map helpers dm writecache: further writecache_map() cleanup dm writecache: factor out writecache_map_remap_origin() dm writecache: split up writecache_map() to improve code readability

dm-ebs: use bvec_virt

2021-08-16T16:50:32Z

Use bvec_virt instead of open coding it. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210804095634.460779-5-hch@lst.de Signed-off-by: Jens Axboe

dm: update target status functions to support IMA measurement

2021-08-10T17:34:23Z

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 ebs: fix a few typos

2021-03-26T18:53:42Z

s/retrievd/retrieved/ s/misalignement/misalignment/ s/funtion/function/ Signed-off-by: Bhaskar Chowdhury Acked-by: Randy Dunlap Signed-off-by: Mike Snitzer

dm ebs: avoid double unlikely() notation when using IS_ERR()

2020-12-21T18:59:37Z

The definition of IS_ERR() already applies the unlikely() notation when checking the error status of the passed pointer. For this reason there is no need to have the same notation outside of IS_ERR() itself. Clean up code by removing redundant notation. Signed-off-by: Antonio Quartulli Signed-off-by: Mike Snitzer

dm ebs: Fix incorrect checking for REQ_OP_FLUSH

2020-08-04T20:01:40Z

REQ_OP_FLUSH was being treated as a flag, but the operation part of bio->bi_opf must be treated as a whole. Change to accessing the operation part via bio_op(bio) and checking for equality. Signed-off-by: John Dorminy Acked-by: Heinz Mauelshagen Fixes: d3c7b35c20d60 ("dm: add emulated block size target") Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer

dm ebs: use dm_bufio_forget_buffers

2020-06-05T18:59:42Z

Use dm_bufio_forget_buffers instead of a block-by-block loop that calls dm_bufio_forget. dm_bufio_forget_buffers is faster than the loop because it searches for used buffers using rb-tree. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

dm ebs: pass discards down to underlying device

2020-05-15T14:29:35Z

Make use of dm_bufio_issue_discard() to pass discards down to the underlying device. Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer

dm: add emulated block size target

2020-05-15T14:29:35Z

This new target is similar to the linear target except that it emulates a smaller logical block size on a device with a larger logical block size. Its main purpose is to emulate 512 byte sectors on 4K native disks (i.e. 512e). See Documentation/admin-guide/device-mapper/dm-ebs.rst for details. Reviewed-by: Damien Le Moal Signed-off-by: Heinz Mauelshagen Signed-off-by: Randy Dunlap [Kconfig fixes] Signed-off-by: Zheng Bin [static fixes] Signed-off-by: Mike Snitzer