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authorNaohiro Aota <naohiro.aota@wdc.com>2021-02-04 13:22:18 +0300
committerDavid Sterba <dsterba@suse.com>2021-02-09 04:46:08 +0300
commit40ab3be102f0a61dbb93093f330b432324a793f1 (patch)
treeb7b92c35cdf2845fa4da3febca37f0b288d0e359 /fs/signalfd.c
parent6ab6ebb76042d3d94a7c6c447f770a28a412c68c (diff)
downloadlinux-40ab3be102f0a61dbb93093f330b432324a793f1.tar.xz
btrfs: zoned: extend zoned allocator to use dedicated tree-log block group
This is the 1/3 patch to enable tree log on zoned filesystems. The tree-log feature does not work on a zoned filesystem as is. Blocks for a tree-log tree are allocated mixed with other metadata blocks and btrfs writes and syncs the tree-log blocks to devices at the time of fsync(), which has a different timing than a global transaction commit. As a result, both writing tree-log blocks and writing other metadata blocks become non-sequential writes that zoned filesystems must avoid. Introduce a dedicated block group for tree-log blocks, so that tree-log blocks and other metadata blocks can be separate write streams. As a result, each write stream can now be written to devices separately. "fs_info->treelog_bg" tracks the dedicated block group and assigns "treelog_bg" on-demand on tree-log block allocation time. This commit extends the zoned block allocator to use the block group. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/signalfd.c')
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