Peter Rajnoha
f36776fafb
kobject: support passing in variables for synthetic uevents ...
This patch makes it possible to pass additional arguments in addition
to uevent action name when writing /sys/.../uevent attribute. These
additional arguments are then inserted into generated synthetic uevent
as additional environment variables.
Before, we were not able to pass any additional uevent environment
variables for synthetic uevents. This made it hard to identify such uevents
properly in userspace to make proper distinction between genuine uevents
originating from kernel and synthetic uevents triggered from userspace.
Also, it was not possible to pass any additional information which would
make it possible to optimize and change the way the synthetic uevents are
processed back in userspace based on the originating environment of the
triggering action in userspace. With the extra additional variables, we are
able to pass through this extra information needed and also it makes it
possible to synchronize with such synthetic uevents as they can be clearly
identified back in userspace.
The format for writing the uevent attribute is following:
ACTION [UUID [KEY=VALUE ...]
There's no change in how "ACTION" is recognized - it stays the same
("add", "change", "remove"). The "ACTION" is the only argument required
to generate synthetic uevent, the rest of arguments, that this patch
adds support for, are optional.
The "UUID" is considered as transaction identifier so it's possible to
use the same UUID value for one or more synthetic uevents in which case
we logically group these uevents together for any userspace listeners.
The "UUID" is expected to be in "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
format where "x" is a hex digit. The value appears in uevent as
"SYNTH_UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" environment variable.
The "KEY=VALUE" pairs can contain alphanumeric characters only. It's
possible to define zero or more more pairs - each pair is then delimited
by a space character " ". Each pair appears in synthetic uevents as
"SYNTH_ARG_KEY=VALUE" environment variable. That means the KEY name gains
"SYNTH_ARG_" prefix to avoid possible collisions with existing variables.
To pass the "KEY=VALUE" pairs, it's also required to pass in the "UUID"
part for the synthetic uevent first.
If "UUID" is not passed in, the generated synthetic uevent gains
"SYNTH_UUID=0" environment variable automatically so it's possible to
identify this situation in userspace when reading generated uevent and so
we can still make a difference between genuine and synthetic uevents.
Signed-off-by: Peter Rajnoha <prajnoha@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-05-25 18:30:51 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2016-03-17 21:38:27 -07:00
lib/fonts/Kconfig: keep non-Sparc fonts listed together
2017-02-27 18:43:46 -08:00
lib/lz4: remove back-compat wrappers
2017-02-24 17:46:57 -08:00
mpi: Fix NULL ptr dereference in mpi_powm() [ver #3 ]
2016-11-25 12:57:50 +11:00
lib/raid6: Add AVX2 optimized xor_syndrome functions
2016-11-07 15:08:20 -08:00
lib/zlib_inflate/inftrees.c: fix potential buffer overflow
2017-05-08 17:15:12 -07:00
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2016-05-17 09:33:39 -07:00
assoc_array: don't call compare_object() on a node
2016-04-06 14:06:48 +01:00
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
2016-06-16 10:48:32 +02:00
lib: add module support to atomic64 tests
2017-02-24 17:46:57 -08:00
kernel-api.rst: fix some complex tags at lib/bitmap.c
2017-04-02 14:29:33 -06:00
debug: Add _ONCE() logic to report_bug()
2017-03-30 09:37:20 +02:00
random: replace non-blocking pool with a Chacha20-based CRNG
2016-07-03 00:57:23 -04:00
ipv4: Update parameters for csum_tcpudp_magic to their original types
2016-03-13 23:55:13 -04:00
boot/param: Move next_arg() function to lib/cmdline.c for later reuse
2017-04-18 10:37:13 +02:00
cpumask: Export cpumask_any_but()
2016-02-29 09:35:20 +01:00
lib: add module support to crc32 tests
2017-02-24 17:46:57 -08:00
lib: add module support to crc32 tests
2017-02-24 17:46:57 -08:00
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>
2017-03-02 08:42:36 +01:00
lib/decompress_unlz4: change module to work with new LZ4 module version
2017-02-24 17:46:57 -08:00
devres: fix devm_ioremap_*() offset parameter kerneldoc description
2017-04-24 13:53:13 -05:00
KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()
2017-03-02 10:09:00 +11:00
dmaengine updates for 4.12-rc1
2017-05-09 15:40:28 -07:00
lib/dma-noop: Clarify a comment
2017-01-24 12:23:35 -05:00
lib/dma-virt: Add dma_virt_ops
2017-01-24 12:23:35 -05:00
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
dynamic_debug: add jump label support
2016-08-04 08:50:07 -04:00
lib/cpio: Make find_cpio_data()'s offset arg optional
2016-06-08 11:04:19 +02:00
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
lib/fault-inject.c: use correct check for interrupts
2017-05-08 17:15:12 -07:00
lib/find_bit.c: micro-optimise find_next_*_bit
2017-02-24 17:46:57 -08:00
lib+mm: fix few spelling mistakes
2016-02-15 11:18:23 +01:00
lib/GCD.c: use binary GCD algorithm instead of Euclidean
2016-05-20 17:58:30 -07:00
lib/genalloc.c: start search from start of chunk
2016-10-27 18:43:43 -07:00
lib: add module support to glob tests
2017-02-24 17:46:57 -08:00
lib: add module support to glob tests
2017-02-24 17:46:57 -08:00
x86/hweight: Get rid of the special calling convention
2016-06-08 15:01:02 +02:00
idr: Add missing __rcu annotations
2017-02-13 21:44:10 -05:00
lib/iommu-helper: skip to next segment
2016-08-02 19:35:07 -04:00
mm: convert generic code to 5-level paging
2017-03-09 11:48:47 -08:00
Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-05-09 09:01:21 -07:00
This adds a new gcc plugin named "latent_entropy". It is designed to
2016-10-15 10:03:15 -07:00
sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-02-28 10:00:39 -08:00
lib: add module support to linked list sorting tests
2017-05-08 17:15:10 -07:00
mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB
2016-07-28 16:07:41 -07:00
kgdb: depends on VT
2016-05-23 17:04:14 -07:00
Kconfig: lib/Kconfig.ubsan fix reference to ubsan documentation
2016-12-14 16:04:08 -08:00
klist: fix starting point removed bug in klist iterators
2016-02-07 22:18:47 -08:00
kobject: Export kobject_get_unless_zero()
2017-03-22 20:11:35 -06:00
kobject: support passing in variables for synthetic uevents
2017-05-25 18:30:51 +02:00
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
bug: switch data corruption check to __must_check
2017-02-24 17:46:56 -08:00
lib: add module support to linked list sorting tests
2017-05-08 17:15:10 -07:00
locking/selftest: Fix output since KERN_CONT changes
2016-11-25 07:12:19 +01:00
locking/core: Remove cpu_relax_lowlatency() users
2016-11-16 10:15:10 +01:00
lib: add module support to linked list sorting tests
2017-05-08 17:15:10 -07:00
netlink: pass extended ACK struct to parsing functions
2017-04-13 13:58:22 -04:00
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
include/linux/nodemask.h: create next_node_in() helper
2016-05-19 19:12:14 -07:00
lib: Introduce priority array area manager
2017-02-03 16:35:42 -05:00
parser: add u64 number parser
2016-12-06 10:17:03 +02:00
percpu-refcount: support synchronous switch to atomic mode.
2017-03-22 19:18:43 -07:00
percpu_counter: percpu_counter_hotcpu_callback() cleanup
2017-01-20 10:06:56 -05:00
sched/headers: Prepare to remove the <linux/gfp.h> include from <linux/sched.h>
2017-03-02 08:42:34 +01:00
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>
2017-03-02 08:42:27 +01:00
lib/prime_numbers: Suppress warn on kmalloc failure
2017-01-23 09:17:12 +01:00
lockdep: allow to disable reclaim lockup detection
2017-05-03 15:52:09 -07:00
This adds a new gcc plugin named "latent_entropy". It is designed to
2016-10-15 10:03:15 -07:00
ratelimit: extend to print suppressed messages on release
2016-08-02 19:35:06 -04:00
rbtree: use designated initializers
2017-02-24 17:46:57 -08:00
refcount: change EXPORT_SYMBOL markings
2017-05-06 11:01:34 -07:00
lib/rhashtable.c: simplify a strange allocation pattern
2017-05-08 17:15:12 -07:00
sbitmap: add sbitmap_get_shallow() operation
2017-04-14 14:06:52 -06:00
scatterlist: do not disable IRQs in sg_copy_buffer
2017-02-27 18:43:46 -08:00
lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c
2016-04-15 16:53:14 -04:00
lib/show_mem.c: teach show_mem to work with the given nodemask
2017-02-22 16:41:30 -08:00
siphash: implement HalfSipHash1-3 for hash tables
2017-01-09 13:58:57 -05:00
sched/core: Remove the tsk_cpus_allowed() wrapper
2017-03-02 08:42:24 +01:00
lib: add CONFIG_TEST_SORT to enable self-test of sort()
2017-02-24 17:46:57 -08:00
lib/stackdepot: export save/fetch stack for drivers
2016-11-11 08:12:37 -08:00
USB patches for 4.12-rc1
2017-05-04 18:03:51 -07:00
string_helpers: add kstrdup_quotable_file
2016-04-21 10:47:26 +10:00
lib: harden strncpy_from_user
2016-10-11 15:06:30 -07:00
unsafe_[get|put]_user: change interface to use a error target label
2016-08-08 13:02:01 -07:00
swiotlb: ensure that page-sized mappings are page-aligned
2017-01-15 12:37:24 -05:00
lib/syscall: Clear return values when no stack
2017-03-24 07:43:35 +01:00
test_bitmap: unit tests for lib/bitmap.c
2016-02-19 22:54:09 -05:00
test_bpf: Use ULL suffix for 64-bit constants
2017-05-03 09:51:26 -04:00
test_firmware: add test custom fallback trigger
2017-01-25 11:52:34 +01:00
lib/test_hash.c: fix warning in preprocessor symbol evaluation
2016-09-01 17:52:01 -07:00
kasan: report only the first error by default
2017-03-31 17:13:30 -07:00
lib: add module support to linked list sorting tests
2017-05-08 17:15:10 -07:00
lib: fix spelling mistake: "actualy" -> "actually"
2017-02-26 11:03:38 -05:00
mm, printk: introduce new format string for flags
2016-03-15 16:55:16 -07:00
rhashtable-test: Fix max_size parameter description
2016-08-08 12:52:42 -07:00
siphash: implement HalfSipHash1-3 for hash tables
2017-01-09 13:58:57 -05:00
Revert "lib/test_sort.c: make it explicitly non-modular"
2017-05-08 17:15:10 -07:00
locking/static_keys: Avoid nested functions
2016-02-09 10:27:29 +01:00
lib: remove check for AVR32 arch in test_user_copy
2017-05-01 09:36:30 +02:00
lib/uuid: add a test module
2016-05-30 15:26:57 -07:00
timerqueue: Use rb_entry_safe() instead of open-coding it
2017-01-20 08:03:42 +01:00
UBSAN: fix typo in format string
2016-08-02 17:31:41 -04:00
lib/ucs2_string: Speed up ucs2_utf8size()
2016-09-09 16:08:46 +01:00
generic ...copy_..._user primitives
2017-03-28 18:22:11 -04:00
lib/uuid.c: use correct offset in uuid parser
2016-05-30 15:26:57 -07:00
checkpatch: add ability to find bad uses of vsprintf %p<foo> extensions
2017-05-08 17:15:10 -07:00
lib/win_minmax: windowed min or max estimator
2016-09-21 00:22:59 -04:00
f36776fafb