Now that in the error patch of extent updating procedure cannot handle
error and roll-back partial updates properly, so we could access the
left inconsistent extent buffer later and lead to BUGON in
errors=continue mode. For example, we could get below BUGON if we
update leaf extent but failed to update index extent in
ext4_ext_insert_extent() and try to alloc block again.
kernel BUG at fs/ext4/mballoc.c:4085!
invalid opcode: 0000 [#1] SMP PTI
CPU: 30 PID: 1177 Comm: xfs_io Not tainted 5.14.0-00006-g555c93b65a81 #543
RIP: 0010:ext4_mb_normalize_request.constprop.0+0x72c/0x8a0
RSP: 0018:ffffb398c0abb8d8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8d79d3125000 RCX: 0000000000001500
RDX: 0000000000001500 RSI: 0000000000000000 RDI: ffffb398c0abba50
RBP: 0000000000001500 R08: 0000000000000001 R09: 00000000000015c0
R10: 0000000000660000 R11: ffff8d79e21212d8 R12: ffff8d79e21215b8
R13: 0000000000001500 R14: ffffb398c0abba50 R15: ffff8d79e21215b8
FS: 00007f1bf519f800(0000) GS:ffff8d80e5d80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c5b96d000 CR3: 000000010f170000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ext4_mb_new_blocks+0x8f3/0x1c90
? __read_extent_tree_block+0x20a/0x260
ext4_ext_map_blocks+0xb7c/0x1d30
ext4_map_blocks+0x15d/0xa30
? __cond_resched+0x1d/0x50
? kmem_cache_alloc+0x206/0x400
_ext4_get_block+0xa8/0x170
ext4_get_block+0x1a/0x30
ext4_block_write_begin+0x179/0x8c0
? ext4_get_block_unwritten+0x20/0x20
? __ext4_journal_start_sb+0x179/0x1d0
ext4_write_begin+0x42d/0x910
ext4_da_write_begin+0x2eb/0x750
generic_perform_write+0xcb/0x280
ext4_buffered_write_iter+0xc3/0x1e0
ext4_file_write_iter+0x70/0xac0
? _raw_spin_unlock+0x12/0x30
? __handle_mm_fault+0x13e1/0x2520
new_sync_write+0x166/0x220
vfs_write+0x1d7/0x3b0
ksys_pwrite64+0x85/0xf0
__x64_sys_pwrite64+0x22/0x30
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1bf5760378
This patch set address to enhance extent check in __ext4_ext_check() and
force check buffer again through clear buffer's verified bit if we
breaks off extent updating.
Thanks,
Yi.
Zhang Yi (3):
ext4: check for out-of-order index extents in
ext4_valid_extent_entries()
ext4: check for inconsistent extents between index and leaf block
ext4: prevent partial update of the extent blocks
fs/ext4/extents.c | 95 +++++++++++++++++++++++++++++++----------------
1 file changed, 64 insertions(+), 31 deletions(-)
--
2.31.1
