kernel.git/fs/bcachefs/btree_key_cache.c, branch linux-6.15.y

bcachefs: Fix bch2_btree_path_traverse_cached() when paths realloced

2025-05-17T22:46:17Z

btree_key_cache_fill() will allocate and traverse another path (for the underlying btree), so we can't hold pointers to paths across a call - we have to pass indices. Signed-off-by: Kent Overstreet

bcachefs: Kill btree_iter.trans

2025-04-02T14:24:34Z

This was planned to be done ages ago, now finally completed; there are places where we have quite a few btree_trans objects on the stack, so this reduces stack usage somewhat. Signed-off-by: Kent Overstreet

bcachefs: do_trace_key_cache_fill()

2025-04-02T14:24:34Z

Reducing stack frame usage; this moves the printbuf out of the main stack frame. Signed-off-by: Kent Overstreet

bcachefs: Fix deadlock

2025-02-27T00:31:05Z

This fixes two deadlocks: 1.pcpu_alloc_mutex involved one as pointed by syzbot[1] 2.recursion deadlock. The root cause is that we hold the bc lock during alloc_percpu, fix it by following the pattern used by __btree_node_mem_alloc(). [1] https://lore.kernel.org/all/66f97d9a.050a0220.6bad9.001d.GAE@google.com/T/ Reported-by: syzbot+fe63f377148a6371a9db@syzkaller.appspotmail.com Tested-by: syzbot+fe63f377148a6371a9db@syzkaller.appspotmail.com Signed-off-by: Alan Huang Signed-off-by: Kent Overstreet

bcachefs: Fix rcu imbalance in bch2_fs_btree_key_cache_exit()

2025-02-07T03:35:11Z

Spotted by sparse. Signed-off-by: Kent Overstreet

bcachefs: Fix btree_trans_peek_key_cache()

2025-01-21T17:26:25Z

BTREE_ITER_cached_nofill has some tricky corner cases; it's used internally for iterators that aren't walking the key cache, but need to be coherent with the key cache. It tells traverse to look up and lock the key cache entry if present, but don't create one if it doesn't exist. That means we have to have a BTREE_ITER_UPTODATE path (because after traverse the path has to be UPTODATE, or we pop assertions) that doesn't point to anything (which is the less bad option, taken by the previous fix). The previous fix for this path missed an issue that can happen in bch2_trans_peek_key_cache(): we can't set should_be_locked on a path that doesn't point to anything and doesn't hold locks. Fixes: bd5b09727f3d ("bcachefs: Don't set btree_path to updtodate if we don't fill") Signed-off-by: Kent Overstreet

bcachefs: Don't set btree_path to updtodate if we don't fill

2025-01-10T04:38:42Z

This fixes various locking asserts, and a null ptr deref in bch2_btree_iter_peek_path(). Signed-off-by: Kent Overstreet

bcachefs: fix bch2_btree_key_cache_drop()

2025-01-10T04:38:41Z

When evicting, we shouldn't leave a pointer to the key cache entry lying around - that screws up btree path asserts we're adding. Signed-off-by: Kent Overstreet

bcachefs: Write lock btree node in key cache fills

2025-01-10T04:38:41Z

this addresses a key cache coherency bug Signed-off-by: Kent Overstreet

bcachefs: trace_key_cache_fill

2024-12-29T18:30:39Z

Signed-off-by: Kent Overstreet