mainlining shenanigans
124604eb50
We recently started recording device stats across the fleet, and noticed a large increase in messages such as this BTRFS warning (device dm-0): get dev_stats failed, not yet valid on our tiers that use seed devices for their root devices. This is because we do not initialize the device stats for any seed devices if we have a sprout device and mount using that sprout device. The basic steps for reproducing are: $ mkfs seed device $ mount seed device # fill seed device $ umount seed device $ btrfstune -S 1 seed device $ mount seed device $ btrfs device add -f sprout device /mnt/wherever $ umount /mnt/wherever $ mount sprout device /mnt/wherever $ btrfs device stats /mnt/wherever This will fail with the above message in dmesg. Fix this by iterating over the fs_devices->seed if they exist in btrfs_init_dev_stats. This fixed the problem and properly reports the stats for both devices. Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> [ rename to btrfs_device_init_dev_stats ] Signed-off-by: David Sterba <dsterba@suse.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| 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 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.