kernel/fs/bcachefs/debug.c, branch linux-rolling-stable

Remove bcachefs core code

2025-09-29T20:43:52Z

bcachefs was marked 'externally maintained' in 6.17 but the code remained to make the transition smoother. It's now a DKMS module, making the in-kernel code stale, so remove it to avoid any version confusion. Link: https://lore.kernel.org/linux-bcachefs/yokpt2d2g2lluyomtqrdvmkl3amv3kgnipmenobkpgx537kay7@xgcgjviv3n7x/T/ Signed-off-by: Linus Torvalds

bcachefs: Fix bch2_btree_transactions_read() synchronization

2025-07-05T16:42:41Z

Since we're accessing btree_trans objects owned by another thread, we need to guard against using pointers to freed key cache entries: we need our own srcu read lock, and we should skip a btree_trans if it didn't hold the srcu lock (and thus it might have pointers to freed key cache entries). 00693 Mem abort info: 00693 ESR = 0x0000000096000005 00693 EC = 0x25: DABT (current EL), IL = 32 bits 00693 SET = 0, FnV = 0 00693 EA = 0, S1PTW = 0 00693 FSC = 0x05: level 1 translation fault 00693 Data abort info: 00693 ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 00693 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 00693 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 00693 user pgtable: 4k pages, 39-bit VAs, pgdp=000000012e650000 00693 [000000008fb96218] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 00693 Internal error: Oops: 0000000096000005 [#1] SMP 00693 Modules linked in: 00693 CPU: 0 UID: 0 PID: 4307 Comm: cat Not tainted 6.16.0-rc2-ktest-g9e15af94fd86 #27578 NONE 00693 Hardware name: linux,dummy-virt (DT) 00693 pstate: 60001005 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=--) 00693 pc : six_lock_counts+0x20/0xe8 00693 lr : bch2_btree_bkey_cached_common_to_text+0x38/0x130 00693 sp : ffffff80ca98bb60 00693 x29: ffffff80ca98bb60 x28: 000000008fb96200 x27: 0000000000000007 00693 x26: ffffff80eafd06b8 x25: 0000000000000000 x24: ffffffc080d75a60 00693 x23: ffffff80eafd0000 x22: ffffffc080bdfcc0 x21: ffffff80eafd0210 00693 x20: ffffff80c192ff08 x19: 000000008fb96200 x18: 00000000ffffffff 00693 x17: 0000000000000000 x16: 0000000000000000 x15: 00000000ffffffff 00693 x14: 0000000000000000 x13: ffffff80ceb5a29a x12: 20796220646c6568 00693 x11: 72205d3e303c5b20 x10: 0000000000000020 x9 : ffffffc0805fb6b0 00693 x8 : 0000000000000020 x7 : 0000000000000000 x6 : 0000000000000020 00693 x5 : ffffff80ceb5a29c x4 : 0000000000000001 x3 : 000000000000029c 00693 x2 : 0000000000000000 x1 : ffffff80ef66c000 x0 : 000000008fb96200 00693 Call trace: 00693 six_lock_counts+0x20/0xe8 (P) 00693 bch2_btree_bkey_cached_common_to_text+0x38/0x130 00693 bch2_btree_trans_to_text+0x260/0x2a8 00693 bch2_btree_transactions_read+0xac/0x1e8 00693 full_proxy_read+0x74/0xd8 00693 vfs_read+0x90/0x300 00693 ksys_read+0x6c/0x108 00693 __arm64_sys_read+0x20/0x30 00693 invoke_syscall.constprop.0+0x54/0xe8 00693 do_el0_svc+0x44/0xc8 00693 el0_svc+0x18/0x58 00693 el0t_64_sync_handler+0x104/0x130 00693 el0t_64_sync+0x154/0x158 00693 Code: 910003fd f9423c22 f90017e2 d2800002 (f9400c01) 00693 ---[ end trace 0000000000000000 ]--- Signed-off-by: Kent Overstreet

bcachefs: Tweak btree cache helpers for use by btree node scan

2025-07-05T03:17:07Z

btree node scan needs to not use the btree node cache: that causes interference from prior failed reads and parallel workers. Instead we need to allocate btree nodes that don't live in the btree cache, so that we can call bch2_btree_node_read_done() directly. This patch tweaks the low level helpers so they don't touch the btree cache lists. Cc: Nikita Ofitserov Reviewed-by: Nikita Ofitserov Reported-and-tested-by: Edoardo Codeglia Signed-off-by: Kent Overstreet

bcachefs: Replace rcu_read_lock() with guards

2025-06-01T04:03:12Z

The new guard(), scoped_guard() allow for more natural code. Some of the uses with creative flow control have been left. Signed-off-by: Kent Overstreet

bcachefs: Include b->ob.nr in cached_btree_node_to_text()

2025-05-30T05:21:13Z

We have a bug report that looks like we might be leaking open buckets - let's check if they got left attached to the cached btree node. Signed-off-by: Kent Overstreet

bcachefs: fix bch2_debugfs_flush_buf() when tabstops are in use

2025-05-22T00:15:05Z

Signed-off-by: Kent Overstreet

bcachefs: Single err message for btree node reads

2025-05-22T00:14:35Z

Like we just did with the data read path, emit a single error message per btree node reads, nicely formatted, with all the actions we took grouped together. Signed-off-by: Kent Overstreet

bcachefs: Async object debugging

2025-05-22T00:14:29Z

Debugging infrastructure for async objs: this lets us easily create fast_lists for various object types so they'll be visible in debugfs. Add new object types to the BCH_ASYNC_OBJS_TYPES() enum, and drop a pretty-printer wrapper in async_objs.c. Signed-off-by: Kent Overstreet

bcachefs: bch_dev.io_ref -> enumerated_ref

2025-05-22T00:14:28Z

Convert device IO refs to enumerated_refs, for easier debugging of refcount issues. Simple conversion: enumerate all users and convert to the new helpers. Signed-off-by: Kent Overstreet

bcachefs: Single device mode

2025-05-22T00:14:15Z

Single device filesystems are now identified by the block device name, not the UUID - and single device filesystems with the same UUID can be mounted simultaneously, without any special options. This allocates a new bit in the superblock, BCH_SB_MULTI_DEVICE, which indicates whether a filesystem has ever been multi device. Signed-off-by: Kent Overstreet