linux-toradex.git/Documentation/admin-guide/device-mapper, branch v5.9-rc4

Merge tag 'for-5.9/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

2020-08-07T20:08:09+00:00

Pull device mapper updates from Mike Snitzer:

- DM multipath locking fixes around m->flags tests and improvements to
bio-based code so that it follows patterns established by
request-based code.

- Request-based DM core improvement to eliminate unnecessary call to
blk_mq_queue_stopped().

- Add "panic_on_corruption" error handling mode to DM verity target.

- DM bufio fix to to perform buffer cleanup from a workqueue rather
than wait for IO in reclaim context from shrinker.

- DM crypt improvement to optionally avoid async processing via
workqueues for reads and/or writes -- via "no_read_workqueue" and
"no_write_workqueue" features. This more direct IO processing
improves latency and throughput with faster storage. Avoiding
workqueue IO submission for writes (DM_CRYPT_NO_WRITE_WORKQUEUE) is a
requirement for adding zoned block device support to DM crypt.

- Add zoned block device support to DM crypt. Makes use of
DM_CRYPT_NO_WRITE_WORKQUEUE and a new optional feature
(DM_CRYPT_WRITE_INLINE) that allows write completion to wait for
encryption to complete. This allows write ordering to be preserved,
which is needed for zoned block devices.

- Fix DM ebs target's check for REQ_OP_FLUSH.

- Fix DM core's report zones support to not report more zones than were
requested.

- A few small compiler warning fixes.

- DM dust improvements to return output directly to the user rather
than require they scrape the system log for output.

* tag 'for-5.9/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm: don't call report zones for more than the user requested
dm ebs: Fix incorrect checking for REQ_OP_FLUSH
dm init: Set file local variable static
dm ioctl: Fix compilation warning
dm raid: Remove empty if statement
dm verity: Fix compilation warning
dm crypt: Enable zoned block device support
dm crypt: add flags to optionally bypass kcryptd workqueues
dm bufio: do buffer cleanup from a workqueue
dm rq: don't call blk_mq_queue_stopped() in dm_stop_queue()
dm dust: add interface to list all badblocks
dm dust: report some message results directly back to user
dm verity: add "panic_on_corruption" error handling mode
dm mpath: use double checked locking in fast path
dm mpath: rename current_pgpath to pgpath in multipath_prepare_ioctl
dm mpath: rework __map_bio()
dm mpath: factor out multipath_queue_bio
dm mpath: push locking down to must_push_back_rq()
dm mpath: take m->lock spinlock when testing QUEUE_IF_NO_PATH
dm mpath: changes from initial m->flags locking audit

Merge tag 'docs-5.9' of git://git.lwn.net/linux

2020-08-05T05:47:54+00:00

Pull documentation updates from Jonathan Corbet:
 "It's been a busy cycle for documentation - hopefully the busiest for a
  while to come. Changes include:

   - Some new Chinese translations

   - Progress on the battle against double words words and non-HTTPS
     URLs

   - Some block-mq documentation

   - More RST conversions from Mauro. At this point, that task is
     essentially complete, so we shouldn't see this kind of churn again
     for a while. Unless we decide to switch to asciidoc or
     something...:)

   - Lots of typo fixes, warning fixes, and more"

* tag 'docs-5.9' of git://git.lwn.net/linux: (195 commits)
  scripts/kernel-doc: optionally treat warnings as errors
  docs: ia64: correct typo
  mailmap: add entry for 
  doc/zh_CN: add cpu-load Chinese version
  Documentation/admin-guide: tainted-kernels: fix spelling mistake
  MAINTAINERS: adjust kprobes.rst entry to new location
  devices.txt: document rfkill allocation
  PCI: correct flag name
  docs: filesystems: vfs: correct flag name
  docs: filesystems: vfs: correct sync_mode flag names
  docs: path-lookup: markup fixes for emphasis
  docs: path-lookup: more markup fixes
  docs: path-lookup: fix HTML entity mojibake
  CREDITS: Replace HTTP links with HTTPS ones
  docs: process: Add an example for creating a fixes tag
  doc/zh_CN: add Chinese translation prefer section
  doc/zh_CN: add clearing-warn-once Chinese version
  doc/zh_CN: add admin-guide index
  doc:it_IT: process: coding-style.rst: Correct __maybe_unused compiler label
  futex: MAINTAINERS: Re-add selftests directory
  ...

dm dust: add interface to list all badblocks

2020-07-20T15:17:41+00:00

This interface may help anyone who want to know all badblocks without
querying for each block.

[Bryan: DMEMIT message if no blocks are in the bad block list.]

Signed-off-by: yangerkun 
Signed-off-by: Bryan Gurney 
Signed-off-by: Mike Snitzer

dm dust: report some message results directly back to user

2020-07-20T15:17:34+00:00

Some messages (queryblock, countbadblocks, removebadblock) are best
reported directly to user directly. Do so with DMEMIT.

[Bryan: maintain __func__ output in DMEMIT messages]

Signed-off-by: yangerkun 
Signed-off-by: Bryan Gurney 
Signed-off-by: Mike Snitzer

dm verity: add "panic_on_corruption" error handling mode

2020-07-13T15:47:33+00:00

Samsung smart phones may need the ability to panic on corruption.  Not
all devices provide the bootloader support needed to use the existing
"restart_on_corruption" mode.  Additional details for why Samsung needs
this new mode can be found here:
https://www.redhat.com/archives/dm-devel/2020-June/msg00235.html

Signed-off-by: jhs2.lee 
Signed-off-by: Mike Snitzer

Replace HTTP links with HTTPS ones: LVM

2020-07-05T20:28:27+00:00

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
          If both the HTTP and HTTPS versions
          return 200 OK and serve the same content:
            Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov 
Link: https://lore.kernel.org/r/20200627103138.71885-1-grandmaster@al2klimov.de
Signed-off-by: Jonathan Corbet

Documentation/admin-guide: dm-integrity: drop doubled words

2020-07-05T20:01:48+00:00

Drop the doubled words "on" and "the".

Signed-off-by: Randy Dunlap 
Cc: Jonathan Corbet 
Cc: linux-doc@vger.kernel.org
Cc: dm-devel@redhat.com
Link: https://lore.kernel.org/r/20200704032020.21923-4-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet

docs: device-mapper: add dm-ebs.rst to an index file

2020-06-19T16:21:56+00:00

Solves this Sphinx warning:
	Documentation/admin-guide/device-mapper/dm-ebs.rst: WARNING: document isn't included in any toctree

Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Mike Snitzer

dm integrity: add status line documentation

2020-06-05T18:59:40+00:00

Signed-off-by: Mikulas Patocka 
Signed-off-by: Mike Snitzer

dm zoned: metadata version 2

2020-05-20T21:09:43+00:00

Implement handling for metadata version 2. The new metadata adds a
label and UUID for the device mapper device, and additional UUID for
the underlying block devices.

It also allows for an additional regular drive to be used for
emulating random access zones. The emulated zones will be placed
logically in front of the zones from the zoned block device, causing
the superblocks and metadata to be stored on that device.

The first zone of the original zoned device will be used to hold
another, tertiary copy of the metadata; this copy carries a generation
number of 0 and is never updated; it's just used for identification.

Signed-off-by: Hannes Reinecke 
Reviewed-by: Bob Liu 
Reviewed-by: Damien Le Moal 
Signed-off-by: Mike Snitzer