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authorQu Wenruo <wqu@suse.com>2020-01-16 13:04:07 +0800
committerDavid Sterba <dsterba@suse.com>2020-03-23 17:01:23 +0100
commit0c891389705698821ab59147bbcfffba22372a91 (patch)
treee07c800cd37ca090877312a8c0253cbf7ca3cb6a /fs/btrfs/tree-log.c
parentBtrfs: don't iterate mod seq list when putting a tree mod seq (diff)
downloadwireguard-linux-0c891389705698821ab59147bbcfffba22372a91.tar.xz
wireguard-linux-0c891389705698821ab59147bbcfffba22372a91.zip
btrfs: relocation: Add introduction of how relocation works
Relocation is one of the most complex part of btrfs, while it's also the foundation stone for online resizing, profile converting. For such a complex facility, we should at least have some introduction to it. This patch will add an basic introduction at pretty a high level, explaining: - What relocation does - How relocation is done Only mentioning how data reloc tree and reloc tree are involved in the operation. No details like the backref cache, or the data reloc tree contents. - Which function to refer. More detailed comments will be added for reloc tree creation, data reloc tree creation and backref cache. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/tree-log.c')
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