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69a3a0a45a
- Support file-backed mounts for containers and sandboxes;
- Mark the experimental fscache backend as deprecated;
- Handle overlapped pclusters caused by crafted images properly;
- Fix a failure path which could cause infinite loops in
z_erofs_init_decompressor();
- Get rid of unnecessary NOFAILs;
- Harmless on-disk hardening & minor cleanups.
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Merge tag 'erofs-for-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs updates from Gao Xiang:
"In this cycle, we add file-backed mount support, which has has been a
strong requirement for years. It is especially useful when there are
thousands of images running on the same host for containers and other
sandbox use cases, unlike OS image use cases.
Without file-backed mounts, it's hard for container runtimes to manage
and isolate so many unnecessary virtual block devices safely and
efficiently, therefore file-backed mounts are highly preferred. For
EROFS users, ComposeFS [1], containerd, and Android APEXes [2] will
directly benefit from it, and I've seen no risk in implementing it as
a completely immutable filesystem.
The previous experimental feature "EROFS over fscache" is now marked
as deprecated because:
- Fscache is no longer an independent subsystem and has been merged
into netfs, which was somewhat unexpected when it was proposed.
- New HSM "fanotify pre-content hooks" [3] will be landed upstream.
These hooks will replace "EROFS over fscache" in a simpler way, as
EROFS won't be bother with kernel caching anymore. Userspace
programs can also manage their own caching hierarchy more flexibly.
Once the HSM "fanotify pre-content hooks" is landed, I will remove the
fscache backend entirely as an internal dependency cleanup. More
backgrounds are listed in the original patchset [4].
In addition to that, there are bugfixes and cleanups as usual.
Summary:
- Support file-backed mounts for containers and sandboxes
- Mark the experimental fscache backend as deprecated
- Handle overlapped pclusters caused by crafted images properly
- Fix a failure path which could cause infinite loops in
z_erofs_init_decompressor()
- Get rid of unnecessary NOFAILs
- Harmless on-disk hardening & minor cleanups"
* tag 'erofs-for-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: reject inodes with negative i_size
erofs: restrict pcluster size limitations
erofs: allocate more short-lived pages from reserved pool first
erofs: sunset unneeded NOFAILs
erofs: simplify erofs_map_blocks_flatmode()
erofs: refactor read_inode calling convention
erofs: use kmemdup_nul in erofs_fill_symlink
erofs: mark experimental fscache backend deprecated
erofs: support compressed inodes for fileio
erofs: support unencoded inodes for fileio
erofs: add file-backed mount support
erofs: handle overlapped pclusters out of crafted images properly
erofs: fix error handling in z_erofs_init_decompressor
erofs: clean up erofs_register_sysfs()
erofs: fix incorrect symlink detection in fast symlink
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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.