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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-08-14 01:15:53 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-23 00:10:11 +0300 |
| commit | ff5b741c25fb9546d876ca4c0c1d8720f6a2471c (patch) | |
| tree | 0e2d24c85bb82e2b0c7bffdb5bffe2b841b78267 /fs/bcachefs/btree_iter.c | |
| parent | e9679b4a0618b0b55d22ec555bc9c6b2dab39809 (diff) | |
| download | linux-ff5b741c25fb9546d876ca4c0c1d8720f6a2471c.tar.xz | |
bcachefs: Zero btree_paths on allocation
This fixes a bug in the cycle detector, bch2_check_for_deadlock() - we
have to make sure the node pointers in the btree paths array are set to
something not-garbage before another thread may see them.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/btree_iter.c')
| -rw-r--r-- | fs/bcachefs/btree_iter.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/bcachefs/btree_iter.c b/fs/bcachefs/btree_iter.c index ad95849845a5..d22412dc5b46 100644 --- a/fs/bcachefs/btree_iter.c +++ b/fs/bcachefs/btree_iter.c @@ -2898,12 +2898,14 @@ static void bch2_trans_alloc_paths(struct btree_trans *trans, struct bch_fs *c) #ifdef __KERNEL__ p = this_cpu_xchg(c->btree_paths_bufs->path, NULL); #endif - if (!p) + if (!p) { p = mempool_alloc(&trans->c->btree_paths_pool, GFP_NOFS); - /* - * paths need to be zeroed, bch2_check_for_deadlock looks at paths in - * other threads - */ + /* + * paths need to be zeroed, bch2_check_for_deadlock looks at + * paths in other threads + */ + memset(p, 0, paths_bytes); + } trans->paths = p; p += paths_bytes; trans->updates = p; p += updates_bytes; |