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75258f20fb
There is a bug report that assert_eb_page_uptodate() gets triggered for free space tree metadata. Without proper dump for the subpage bitmaps it's much harder to debug. Thus this patch would dump all the subpage bitmaps (split them into their own bitmaps) for a easier debugging. The output would look like this: (Dumped after a tree block got read from disk) page:000000006e34bf49 refcount:4 mapcount:0 mapping:0000000067661ac4 index:0x1d1 pfn:0x110e9 memcg:ffff0000d7d62000 aops:btree_aops [btrfs] ino:1 flags: 0x8000000000002002(referenced|private|zone=2) page_type: 0xffffffff() raw: 8000000000002002 0000000000000000 dead000000000122 ffff00000188bed0 raw: 00000000000001d1 ffff0000c7992700 00000004ffffffff ffff0000d7d62000 page dumped because: btrfs subpage dump BTRFS warning (device dm-1): start=30490624 len=16384 page=30474240 bitmaps: uptodate=4-7 error= dirty= writeback= ordered= checked= Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.