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Filename Latest commit message Latest commit date
Tejun Heo 9d179b8654 blkcg: Fix multiple bugs in blkcg_activate_policy() 
blkcg_activate_policy() has the following bugs.

* cf09a8ee19 ("blkcg: pass @q and @blkcg into
  blkcg_pol_alloc_pd_fn()") added @blkcg to ->pd_alloc_fn(); however,
  blkcg_activate_policy() ends up using pd's allocated for the root
  blkcg for all preallocations, so ->pd_init_fn() for non-root blkcgs
  can be passed in pd's which are allocated for the root blkcg.

  For blk-iocost, this means that ->pd_init_fn() can write beyond the
  end of the allocated object as it determines the length of the flex
  array at the end based on the blkcg's nesting level.

* Each pd is initialized as they get allocated.  If alloc fails, the
  policy will get freed with pd's initialized on it.

* After the above partial failure, the partial pds are not freed.

This patch fixes all the above issues by

* Restructuring blkcg_activate_policy() so that alloc and init passes
  are separate.  Init takes place only after all allocs succeeded and
  on failure all allocated pds are freed.

* Unifying and fixing the cleanup of the remaining pd_prealloc.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: cf09a8ee19 ("blkcg: pass @q and @blkcg into blkcg_pol_alloc_pd_fn()")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-10-15 10:13:00 -06:00
arch Merge branch 'akpm' (patches from Andrew) 2019-09-24 16:10:23 -07:00
block blkcg: Fix multiple bugs in blkcg_activate_policy() 2019-10-15 10:13:00 -06:00
certs
crypto
Documentation The highlights are: 2019-09-25 10:21:13 -07:00
drivers nbd: fix possible sysfs duplicate warning 2019-10-10 09:44:56 -06:00
fs io_uring: consider the overflow of sequence for timeout req 2019-10-15 08:55:50 -06:00
include block: pg: add header include guard 2019-10-02 20:32:27 -06:00
init
ipc
kernel Revert "libata, freezer: avoid block device removal while system is frozen" 2019-10-06 09:11:37 -06:00
lib
LICENSES
mm bdi: Do not use freezable workqueue 2019-10-06 09:11:35 -06:00
net The highlights are: 2019-09-25 10:21:13 -07:00
samples
scripts
security KEYS: trusted: correctly initialize digests and fix locking issue 2019-09-25 02:43:53 +03:00
sound sound fixes for 5.4-rc1 2019-09-24 16:46:16 -07:00
tools tpmdd fixes for Linux v5.4 2019-09-25 09:40:24 -07:00
usr
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MAINTAINERS tpmdd fixes for Linux v5.4 2019-09-25 09:40:24 -07:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.