forked from luck/tmp_suning_uos_patched
1d53c9e672
The btrfs writepages function collects a large range of pages flagged
for delayed allocation, and then sends them down through the COW code
for processing. When compression is on, we allocate one async_chunk
structure for every 512K, and then run those pages through the
compression code for IO submission.
writepages starts all of this off with a single page, locked by the
original call to extent_write_cache_pages(), and it's important to keep
track of this page because it has already been through
clear_page_dirty_for_io().
The btrfs async_chunk struct has a pointer to the locked_page, and when
we're redirtying the page because compression had to fallback to
uncompressed IO, we use page->index to decide if a given async_chunk
struct really owns that page.
But, this is racey. If a given delalloc range is broken up into two
async_chunks (chunkA and chunkB), we can end up with something like
this:
compress_file_range(chunkA)
submit_compress_extents(chunkA)
submit compressed bios(chunkA)
put_page(locked_page)
compress_file_range(chunkB)
...
Or:
async_cow_submit
submit_compressed_extents <--- falls back to buffered writeout
cow_file_range
extent_clear_unlock_delalloc
__process_pages_contig
put_page(locked_pages)
async_cow_submit
The end result is that chunkA is completed and cleaned up before chunkB
even starts processing. This means we can free locked_page() and reuse
it elsewhere. If we get really lucky, it'll have the same page->index
in its new home as it did before.
While we're processing chunkB, we might decide we need to fall back to
uncompressed IO, and so compress_file_range() will call
__set_page_dirty_nobufers() on chunkB->locked_page.
Without cgroups in use, this creates as a phantom dirty page, which
isn't great but isn't the end of the world. What can happen, it can go
through the fixup worker and the whole COW machinery again:
in submit_compressed_extents():
while (async extents) {
...
cow_file_range
if (!page_started ...)
extent_write_locked_range
else if (...)
unlock_page
continue;
This hasn't been observed in practice but is still possible.
With cgroups in use, we might crash in the accounting code because
page->mapping->i_wb isn't set.
BUG: unable to handle kernel NULL pointer dereference at 00000000000000d0
IP: percpu_counter_add_batch+0x11/0x70
PGD 66534e067 P4D 66534e067 PUD 66534f067 PMD 0
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
CPU: 16 PID: 2172 Comm: rm Not tainted
RIP: 0010:percpu_counter_add_batch+0x11/0x70
RSP: 0018:ffffc9000a97bbe0 EFLAGS: 00010286
RAX: 0000000000000005 RBX: 0000000000000090 RCX: 0000000000026115
RDX: 0000000000000030 RSI: ffffffffffffffff RDI: 0000000000000090
RBP: 0000000000000000 R08: fffffffffffffff5 R09: 0000000000000000
R10: 00000000000260c0 R11: ffff881037fc26c0 R12: ffffffffffffffff
R13: ffff880fe4111548 R14: ffffc9000a97bc90 R15: 0000000000000001
FS: 00007f5503ced480(0000) GS:ffff880ff7200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000d0 CR3: 00000001e0459005 CR4: 0000000000360ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
account_page_cleaned+0x15b/0x1f0
__cancel_dirty_page+0x146/0x200
truncate_cleanup_page+0x92/0xb0
truncate_inode_pages_range+0x202/0x7d0
btrfs_evict_inode+0x92/0x5a0
evict+0xc1/0x190
do_unlinkat+0x176/0x280
do_syscall_64+0x63/0x1a0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The fix here is to make asyc_chunk->locked_page NULL everywhere but the
one async_chunk struct that's allowed to do things to the locked page.
Link: https://lore.kernel.org/linux-btrfs/c2419d01-5c84-3fb4-189e-4db519d08796@suse.com/
Fixes:
|
||
|---|---|---|
| .. | ||
| tests | ||
| acl.c | ||
| async-thread.c | ||
| async-thread.h | ||
| backref.c | ||
| backref.h | ||
| block-group.c | ||
| block-group.h | ||
| block-rsv.c | ||
| block-rsv.h | ||
| btrfs_inode.h | ||
| check-integrity.c | ||
| check-integrity.h | ||
| compression.c | ||
| compression.h | ||
| ctree.c | ||
| ctree.h | ||
| delalloc-space.c | ||
| delalloc-space.h | ||
| delayed-inode.c | ||
| delayed-inode.h | ||
| delayed-ref.c | ||
| delayed-ref.h | ||
| dev-replace.c | ||
| dev-replace.h | ||
| dir-item.c | ||
| disk-io.c | ||
| disk-io.h | ||
| export.c | ||
| export.h | ||
| extent_io.c | ||
| extent_io.h | ||
| extent_map.c | ||
| extent_map.h | ||
| extent-io-tree.h | ||
| extent-tree.c | ||
| file-item.c | ||
| file.c | ||
| free-space-cache.c | ||
| free-space-cache.h | ||
| free-space-tree.c | ||
| free-space-tree.h | ||
| inode-item.c | ||
| inode-map.c | ||
| inode-map.h | ||
| inode.c | ||
| ioctl.c | ||
| Kconfig | ||
| locking.c | ||
| locking.h | ||
| lzo.c | ||
| Makefile | ||
| misc.h | ||
| ordered-data.c | ||
| ordered-data.h | ||
| orphan.c | ||
| print-tree.c | ||
| print-tree.h | ||
| props.c | ||
| props.h | ||
| qgroup.c | ||
| qgroup.h | ||
| raid56.c | ||
| raid56.h | ||
| rcu-string.h | ||
| reada.c | ||
| ref-verify.c | ||
| ref-verify.h | ||
| relocation.c | ||
| root-tree.c | ||
| scrub.c | ||
| send.c | ||
| send.h | ||
| space-info.c | ||
| space-info.h | ||
| struct-funcs.c | ||
| super.c | ||
| sysfs.c | ||
| sysfs.h | ||
| transaction.c | ||
| transaction.h | ||
| tree-checker.c | ||
| tree-checker.h | ||
| tree-defrag.c | ||
| tree-log.c | ||
| tree-log.h | ||
| ulist.c | ||
| ulist.h | ||
| uuid-tree.c | ||
| volumes.c | ||
| volumes.h | ||
| xattr.c | ||
| xattr.h | ||
| zlib.c | ||
| zstd.c | ||