mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-11-08 18:57:22 +00:00
No description
- C 96.8%
- Assembly 0.9%
- Rust 0.7%
- Shell 0.6%
- Python 0.5%
- Other 0.3%
c2662b1544
This patch introduces formal support for shrinking the cache origin by
reducing the cache target length via table reloads. Cache blocks mapped
beyond the new target length must be clean and are invalidated during
preresume. If any dirty blocks exist in the area being removed, the
preresume operation fails without setting the NEEDS_CHECK flag in
superblock, and the resume ioctl returns EFBIG. The cache device remains
suspended until a table reload with target length that fits existing
mappings is performed.
Without this patch, reducing the cache target length could result in
io errors (RHBZ: 2134334), out-of-bounds memory access to the discard
bitset, and security concerns regarding data leakage.
Verification steps:
1. create a cache metadata with some cached blocks mapped to the tail
of the origin device. Here we use cache_restore v1.0 to build a
metadata with one clean block mapped to the last origin block.
cat <<EOF >> cmeta.xml
<superblock uuid="" block_size="128" nr_cache_blocks="512" \
policy="smq" hint_width="4">
<mappings>
<mapping cache_block="0" origin_block="4095" dirty="false"/>
</mappings>
</superblock>
EOF
dmsetup create cmeta --table "0 8192 linear /dev/sdc 0"
cache_restore -i cmeta.xml -o /dev/mapper/cmeta --metadata-version=2
dmsetup remove cmeta
2. bring up the cache whilst shrinking the cache origin by one block:
dmsetup create cmeta --table "0 8192 linear /dev/sdc 0"
dmsetup create cdata --table "0 65536 linear /dev/sdc 8192"
dmsetup create corig --table "0 524160 linear /dev/sdc 262144"
dmsetup create cache --table "0 524160 cache /dev/mapper/cmeta \
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0"
3. check the number of cached data blocks via dmsetup status. It is
expected to be zero.
dmsetup status cache | cut -d ' ' -f 7
In addition to the script above, this patch can be verified using the
"cache/resize" tests in dmtest-python:
./dmtest run --rx cache/resize/shrink_origin --result-set default
Signed-off-by: Ming-Hung Tsai <mtsai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
|
History
|
|
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 reStructuredText 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.