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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2022-03-17 20:51:27 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-22 17:09:50 -0400 |
| commit | a8c752bb1d93a24a0de753e209d4f4d58d65c878 (patch) | |
| tree | c0acc070a99c2c869e535b34be3fdff39ee9bd06 /fs/bcachefs/bcachefs.h | |
| parent | 920e69bc3db88d3825c69190cafd43f0a1918d3b (diff) | |
| download | linux-stable-a8c752bb1d93a24a0de753e209d4f4d58d65c878.tar.gz linux-stable-a8c752bb1d93a24a0de753e209d4f4d58d65c878.tar.bz2 linux-stable-a8c752bb1d93a24a0de753e209d4f4d58d65c878.zip | |
bcachefs: New on disk format: Backpointers
This patch adds backpointers: we now have a reverse index from device
and offset on that device (specifically, offset within a bucket) back to
btree nodes and (non cached) data extents.
The first 40 backpointers within a bucket are stored in the alloc key;
after that backpointers spill over to the next backpointers btree. This
is to help avoid performance regressions from additional btree updates
on large streaming workloads.
This patch adds all the code for creating, checking and repairing
backpointers. The next patch in the series is going to use backpointers
for copygc - finally getting rid of the need to scan all extents to do
copygc.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/bcachefs.h')
| -rw-r--r-- | fs/bcachefs/bcachefs.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h index 91f635faccb0..6d048e5d8843 100644 --- a/fs/bcachefs/bcachefs.h +++ b/fs/bcachefs/bcachefs.h @@ -315,7 +315,10 @@ do { \ "done in memory") \ BCH_DEBUG_PARAM(verify_all_btree_replicas, \ "When reading btree nodes, read all replicas and " \ - "compare them") + "compare them") \ + BCH_DEBUG_PARAM(backpointers_no_use_write_buffer, \ + "Don't use the write buffer for backpointers, enabling "\ + "extra runtime checks") /* Parameters that should only be compiled in debug mode: */ #define BCH_DEBUG_PARAMS_DEBUG() \ @@ -435,6 +438,7 @@ enum gc_phase { GC_PHASE_BTREE_lru, GC_PHASE_BTREE_freespace, GC_PHASE_BTREE_need_discard, + GC_PHASE_BTREE_backpointers, GC_PHASE_PENDING_DELETE, }; @@ -552,6 +556,7 @@ enum { BCH_FS_INITIAL_GC_DONE, /* kill when we enumerate fsck passes */ BCH_FS_CHECK_ALLOC_DONE, BCH_FS_CHECK_LRUS_DONE, + BCH_FS_CHECK_BACKPOINTERS_DONE, BCH_FS_CHECK_ALLOC_TO_LRU_REFS_DONE, BCH_FS_FSCK_DONE, BCH_FS_INITIAL_GC_UNFIXED, /* kill when we enumerate fsck errors */ |