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Merge tag 'afs-next-20250310' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
This fixes an occasional hang that's only really encountered when rmmod'ing
the kafs module, one of the reasons why I'm proposing it for the next merge
window rather than immediate upstreaming. The changes include:
(1) Remove the "-o autocell" mount option. This is obsolete with the
dynamic root and removing it makes the next patch slightly easier.
(2) Change how the dynamic root mount is constructed. Currently, the root
directory is (de)populated when it is (un)mounted if there are cells
already configured and, further, pairs of automount points have to be
created/removed each time a cell is added/deleted.
This is changed so that readdir on the root dir lists all the known
cell automount pairs plus the @cell symlinks and the inodes and
dentries are constructed by lookup on demand. This simplifies the
cell management code.
(3) A few improvements to the afs_volume tracepoint.
(4) A few improvements to the afs_server tracepoint.
(5) Pass trace info into the afs_lookup_cell() function to allow the trace
log to indicate the purpose of the lookup.
(6) Remove the 'net' parameter from afs_unuse_cell() as it's superfluous.
(7) In rxrpc, allow a kernel app (such as kafs) to store a word of
information on rxrpc_peer records.
(8) Use the information stored on the rxrpc_peer record to point to the
afs_server record. This allows the server address lookup to be done
away with.
(9) Simplify the afs_server ref/activity accounting to make each one
self-contained and not garbage collected from the cell management work
item.
(10) Simplify the afs_cell ref/activity accounting to make each one of
these also self-contained and not driven by a central management work
item.
The current code was intended to make it such that a single timer for
the namespace and one work item per cell could do all the work
required to maintain these records. This, however, made for some
sequencing problems when cleaning up these records. Further, the
attempt to pass refs along with timers and work items made getting it
right rather tricky when the timer or work item already had a ref
attached and now a ref had to be got rid of.
* tag 'afs-next-20250310' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Simplify cell record handling
afs: Fix afs_server ref accounting
afs: Use the per-peer app data provided by rxrpc
rxrpc: Allow the app to store private data on peer structs
afs: Drop the net parameter from afs_unuse_cell()
afs: Make afs_lookup_cell() take a trace note
afs: Improve server refcount/active count tracing
afs: Improve afs_volume tracing to display a debug ID
afs: Change dynroot to create contents on demand
afs: Remove the "autocell" mount option
https://lore.kernel.org/r/802823.1741600633@warthog.procyon.org.uk
Signed-off-by: Christian Brauner <brauner@kernel.org>
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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.