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b6debf15d4
When doing qgroup rescan using the following script (modified from btrfs/017 test case), we can sometimes hit qgroup corruption. ------ umount $dev &> /dev/null umount $mnt &> /dev/null mkfs.btrfs -f -n 64k $dev mount $dev $mnt extent_size=8192 xfs_io -f -d -c "pwrite 0 $extent_size" $mnt/foo > /dev/null btrfs subvolume snapshot $mnt $mnt/snap xfs_io -f -c "reflink $mnt/foo" $mnt/foo-reflink > /dev/null xfs_io -f -c "reflink $mnt/foo" $mnt/snap/foo-reflink > /dev/null xfs_io -f -c "reflink $mnt/foo" $mnt/snap/foo-reflink2 > /dev/unll btrfs quota enable $mnt # -W is the new option to only wait rescan while not starting new one btrfs quota rescan -W $mnt btrfs qgroup show -prce $mnt umount $mnt # Need to patch btrfs-progs to report qgroup mismatch as error btrfs check $dev || _fail ------ For fast machine, we can hit some corruption which missed accounting tree blocks: ------ qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 8.00KiB 0.00B none none --- --- 0/257 8.00KiB 0.00B none none --- --- ------ This is due to the fact that we're always searching commit root for btrfs_find_all_roots() at qgroup_rescan_leaf(), but the leaf we get is from current transaction, not commit root. And if our tree blocks get modified in current transaction, we won't find any owner in commit root, thus causing the corruption. Fix it by searching commit root for extent tree for qgroup_rescan_leaf(). Reported-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.