mirror of
https://github.com/torvalds/linux.git
synced 2026-07-29 10:41:49 +02:00
Linux kernel source tree
9962cb7748
This fixes another "rebalance spinning and doing no work" issue; rebalance was reading extents it wanted to move, but then failing in bch2_write() -> bch2_alloc_sectors_start() due to being unable to allocate sufficient replicas. This was triggered by a user playing with the durability settings, the foreground device was an NVME device with durability=2, and originally he'd set the background device to durability=2 as well, but changed it back to 1 (the default) after seeing IO errors. That meant that with replicas=2, we want to move data off the NVME device which satisfies that constraint, but with a single durability=1 device on the background target there's no way to move the extent to that target while satisfiying the "required replicas" constraint. The solution for now is for bch2_data_update_init() to check for this, and return an error - before kicking off the read. bch2_data_update_init() already had two different checks for "will we be able to write this extent", with partially duplicated code, so this patch combines and improves that logic. Additionally, we now always bail out and return an error if there's insufficient space on the destination target. Previously, we only did this for BCH_WRITE_alloc_nowait moves, because it might be the case that copygc just needs to free up space on the destination target. But we really shouldn't kick off a move if the destination is full, we can't currently distinguish between "really full" and "just need to wait for copygc", and if we are going to wait on copygc it'd be better to do that before kicking off the move. This will additionally fix "rebalance spinning" issues caused by a filesystem that has more data than can fit in background_target - which is a valid scenario, since we don't exclude foreground/cache devices when calculating filesystem capacity. Reported-by: Maël Kerbiriou <mael.kerbiriou@free.fr> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> |
||
|---|---|---|
| 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.