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7bddf18f47
linux/fs/btrfs
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Josef Bacik 7bddf18f47 btrfs: don't drop extent_map for free space inode on write error 
commit 5571e41ec6 upstream.

While running the CI for an unrelated change I hit the following panic
with generic/648 on btrfs_holes_spacecache.

assertion failed: block_start != EXTENT_MAP_HOLE, in fs/btrfs/extent_io.c:1385
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent_io.c:1385!
invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
CPU: 1 PID: 2695096 Comm: fsstress Kdump: loaded Tainted: G        W          6.8.0-rc2+ #1
RIP: 0010:__extent_writepage_io.constprop.0+0x4c1/0x5c0
Call Trace:
 <TASK>
 extent_write_cache_pages+0x2ac/0x8f0
 extent_writepages+0x87/0x110
 do_writepages+0xd5/0x1f0
 filemap_fdatawrite_wbc+0x63/0x90
 __filemap_fdatawrite_range+0x5c/0x80
 btrfs_fdatawrite_range+0x1f/0x50
 btrfs_write_out_cache+0x507/0x560
 btrfs_write_dirty_block_groups+0x32a/0x420
 commit_cowonly_roots+0x21b/0x290
 btrfs_commit_transaction+0x813/0x1360
 btrfs_sync_file+0x51a/0x640
 __x64_sys_fdatasync+0x52/0x90
 do_syscall_64+0x9c/0x190
 entry_SYSCALL_64_after_hwframe+0x6e/0x76

This happens because we fail to write out the free space cache in one
instance, come back around and attempt to write it again.  However on
the second pass through we go to call btrfs_get_extent() on the inode to
get the extent mapping.  Because this is a new block group, and with the
free space inode we always search the commit root to avoid deadlocking
with the tree, we find nothing and return a EXTENT_MAP_HOLE for the
requested range.

This happens because the first time we try to write the space cache out
we hit an error, and on an error we drop the extent mapping.  This is
normal for normal files, but the free space cache inode is special.  We
always expect the extent map to be correct.  Thus the second time
through we end up with a bogus extent map.

Since we're deprecating this feature, the most straightforward way to
fix this is to simply skip dropping the extent map range for this failed
range.

I shortened the test by using error injection to stress the area to make
it easier to reproduce.  With this patch in place we no longer panic
with my error injection test.

CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 09:24:48 +01:00
..
tests btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
accessors.c btrfs: add eb to btrfs_node_key_ptr_offset 2022-12-05 18:00:58 +01:00
accessors.h btrfs: use helper sizeof_field in struct accessors 2023-08-21 14:52:13 +02:00
acl.c fs: port acl to mnt_idmap 2023-01-19 09:24:28 +01:00
acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
async-thread.c btrfs: use alloc_ordered_workqueue() to create ordered workqueues 2023-06-19 13:59:30 +02:00
async-thread.h btrfs: use alloc_ordered_workqueue() to create ordered workqueues 2023-06-19 13:59:30 +02:00
backref.c btrfs: fix unwritten extent buffer after snapshotting a new subvolume 2023-10-23 17:17:30 +02:00
backref.h btrfs: fix unwritten extent buffer after snapshotting a new subvolume 2023-10-23 17:17:30 +02:00
bio.c btrfs: add an ordered_extent pointer to struct btrfs_bio 2023-06-19 13:59:36 +02:00
bio.h btrfs: add an ordered_extent pointer to struct btrfs_bio 2023-06-19 13:59:36 +02:00
block-group.c btrfs: do not delete unused block group if it may be used soon 2024-02-23 09:24:47 +01:00
block-group.h btrfs: add and use helper to check if block group is used 2024-02-23 09:24:47 +01:00
block-rsv.c btrfs: account block group tree when calculating global reserve size 2023-07-20 19:22:54 +02:00
block-rsv.h btrfs: move btrfs_check_trunc_cache_free_space into block-rsv.c 2023-06-19 13:59:24 +02:00
btrfs_inode.h btrfs: reduce the number of arguments to btrfs_run_delalloc_range 2023-08-21 14:52:14 +02:00
check-integrity.c btrfs: rename __btrfs_map_block to btrfs_map_block 2023-06-19 13:59:34 +02:00
check-integrity.h
compression.c btrfs: make btrfs_compressed_bioset static 2023-06-19 17:01:44 +02:00
compression.h btrfs: pass an ordered_extent to btrfs_submit_compressed_write 2023-06-19 13:59:36 +02:00
ctree.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
ctree.h btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
defrag.c btrfs: drop gfp from parameter extent state helpers 2023-06-19 13:59:30 +02:00
defrag.h btrfs: move defrag related prototypes to their own header 2022-12-05 18:00:46 +01:00
delalloc-space.c btrfs: don't reserve space for checksums when writing to nocow files 2024-02-23 09:24:48 +01:00
delalloc-space.h btrfs: move delalloc space related prototypes to delalloc-space.h 2022-12-05 18:00:44 +01:00
delayed-inode.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
delayed-inode.h btrfs: add __counted_by for struct btrfs_delayed_item and use struct_size() 2023-10-11 11:37:19 +02:00
delayed-ref.c btrfs: prevent transaction block reserve underflow when starting transaction 2023-09-20 20:42:18 +02:00
delayed-ref.h btrfs: prevent transaction block reserve underflow when starting transaction 2023-09-20 20:42:18 +02:00
dev-replace.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
dev-replace.h btrfs: move dev-replace prototypes into dev-replace.h 2022-12-05 18:00:47 +01:00
dir-item.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
dir-item.h btrfs: move dir-item prototypes into dir-item.h 2022-12-05 18:00:46 +01:00
discard.c btrfs: unexport btrfs_run_discard_work and make it static 2023-06-19 13:59:25 +02:00
discard.h btrfs: unexport btrfs_run_discard_work and make it static 2023-06-19 13:59:25 +02:00
disk-io.c btrfs: do not ASSERT() if the newly created subvolume already got read 2024-02-23 09:24:47 +01:00
disk-io.h btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
export.c btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
export.h btrfs: simplify generation check in btrfs_get_dentry 2022-12-05 18:00:41 +01:00
extent_io.c btrfs: don't clear qgroup reserved bit in release_folio 2023-12-20 17:02:03 +01:00
extent_io.h btrfs: zoned: introduce block group context to btrfs_eb_write_context 2023-08-21 14:52:19 +02:00
extent_map.c btrfs: fix incorrect splitting in btrfs_drop_extent_map_range 2023-08-18 14:38:10 +02:00
extent_map.h btrfs: pass the new logical address to split_extent_map 2023-06-19 13:59:33 +02:00
extent-io-tree.c btrfs: make find_first_extent_bit() return a boolean 2023-08-21 14:52:12 +02:00
extent-io-tree.h btrfs: make find_first_extent_bit() return a boolean 2023-08-21 14:52:12 +02:00
extent-tree.c btrfs: zoned: optimize hint byte for zoned allocator 2024-01-31 16:19:10 -08:00
extent-tree.h btrfs: wait on uncached block groups on every allocation loop 2023-08-21 14:54:47 +02:00
file-item.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
file-item.h btrfs: scrub: avoid unnecessary csum tree search preparing stripes 2023-08-21 14:54:48 +02:00
file.c btrfs: fix qgroup_free_reserved_data int overflow 2023-12-20 17:02:03 +01:00
file.h btrfs: use cached state when looking for delalloc ranges with fiemap 2022-12-05 18:00:56 +01:00
free-space-cache.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
free-space-cache.h btrfs: move btrfs_check_trunc_cache_free_space into block-rsv.c 2023-06-19 13:59:24 +02:00
free-space-tree.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
free-space-tree.h btrfs: make clear_cache mount option to rebuild FST without disabling it 2023-05-10 14:51:27 +02:00
fs.c btrfs: sysfs: update fs features directory asynchronously 2023-02-13 17:50:35 +01:00
fs.h btrfs: zoned: activate metadata block group on write time 2023-08-21 14:52:19 +02:00
inode-item.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
inode-item.h btrfs: move split_flags/combine_flags helpers to inode-item.h 2023-06-19 13:59:25 +02:00
inode.c btrfs: don't drop extent_map for free space inode on write error 2024-02-23 09:24:48 +01:00
ioctl.c btrfs: forbid creating subvol qgroups 2024-02-23 09:24:47 +01:00
ioctl.h fs: port ->fileattr_set() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
Kconfig MAINTAINERS: remove links to obsolete btrfs.wiki.kernel.org 2023-09-08 14:21:27 +02:00
locking.c btrfs: add block-group tree to lockdep classes 2023-06-19 13:59:35 +02:00
locking.h btrfs: do not block starts waiting on previous transaction commit 2023-09-08 14:10:49 +02:00
lru_cache.c btrfs: send: cache utimes operations for directories if possible 2023-02-15 19:38:50 +01:00
lru_cache.h btrfs: remove btrfs_lru_cache_is_full() inline function 2023-04-17 18:01:18 +02:00
lzo.c btrfs: disable allocation warnings for compression workspaces 2023-06-19 13:59:34 +02:00
Makefile btrfs: send: genericize the backref cache to allow it to be reused 2023-02-13 17:50:35 +01:00
messages.c btrfs: remove v0 extent handling 2023-08-21 14:54:48 +02:00
messages.h btrfs: remove v0 extent handling 2023-08-21 14:54:48 +02:00
misc.h minmax: add in_range() macro 2023-08-24 16:20:18 -07:00
ordered-data.c btrfs: fix qgroup_free_reserved_data int overflow 2023-12-20 17:02:03 +01:00
ordered-data.h btrfs: add a btrfs_finish_ordered_extent helper 2023-06-19 13:59:37 +02:00
orphan.c btrfs: move orphan prototypes into orphan.h 2022-12-05 18:00:47 +01:00
orphan.h btrfs: move orphan prototypes into orphan.h 2022-12-05 18:00:47 +01:00
print-tree.c btrfs: remove v0 extent handling 2023-08-21 14:54:48 +02:00
print-tree.h btrfs: print-tree: pass const extent buffer pointer 2023-06-19 13:59:22 +02:00
props.c btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
props.h btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
qgroup.c btrfs: forbid deleting live subvol qgroup 2024-02-23 09:24:48 +01:00
qgroup.h btrfs: qgroup: iterate qgroups without memory allocation for qgroup_reserve() 2024-01-01 12:42:24 +00:00
raid56.c btrfs: scrub: avoid unnecessary csum tree search preparing stripes 2023-08-21 14:54:48 +02:00
raid56.h btrfs: raid56: remove unused BTRFS_RBIO_REBUILD_MISSING 2023-08-21 14:52:12 +02:00
rcu-string.h btrfs: replace strncpy() with strscpy() 2022-12-05 18:00:59 +01:00
ref-verify.c btrfs: ref-verify: free ref cache before clearing mount opt 2024-01-31 16:19:06 -08:00
ref-verify.h
reflink.c btrfs: convert to ctime accessor functions 2023-07-13 10:28:04 +02:00
reflink.h
relocation.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
relocation.h btrfs: pass an ordered_extent to btrfs_reloc_clone_csums 2023-06-19 13:59:36 +02:00
root-tree.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
root-tree.h btrfs: move root tree prototypes to their own header 2022-12-05 18:00:44 +01:00
scrub.c btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned 2024-01-31 16:19:05 -08:00
scrub.h btrfs: scrub: remove scrub_bio structure 2023-04-17 18:01:24 +02:00
send.c btrfs: send: return EOPNOTSUPP on unknown flags 2024-02-23 09:24:48 +01:00
send.h btrfs: send add define for v2 buffer size 2022-12-05 18:00:41 +01:00
space-info.c btrfs: zoned: re-enable metadata over-commit for zoned mode 2023-08-21 14:52:19 +02:00
space-info.h btrfs: update documentation for BTRFS_RESERVE_FLUSH_EVICT flush method 2023-04-17 18:01:18 +02:00
subpage.c btrfs: stop setting PageError in the data I/O path 2023-06-19 13:59:35 +02:00
subpage.h btrfs: stop setting PageError in the data I/O path 2023-06-19 13:59:35 +02:00
super.c btrfs: add dmesg output for first mount and last unmount of a filesystem 2023-12-08 08:52:20 +01:00
super.h btrfs: move super_block specific helpers into super.h 2022-12-05 18:00:47 +01:00
sysfs.c btrfs: sysfs: validate scrub_speed_max value 2024-01-31 16:18:49 -08:00
sysfs.h btrfs: sysfs: update fs features directory asynchronously 2023-02-13 17:50:35 +01:00
transaction.c btrfs: free qgroup pertrans reserve on transaction abort 2024-01-01 12:42:24 +00:00
transaction.h btrfs: free qgroup pertrans reserve on transaction abort 2024-01-01 12:42:24 +00:00
tree-checker.c btrfs: tree-checker: fix inline ref size in error messages 2024-01-31 16:19:06 -08:00
tree-checker.h btrfs: move btrfs_verify_level_key into tree-checker.c 2023-06-19 13:59:25 +02:00
tree-log.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
tree-log.h btrfs: change for_rename argument of btrfs_record_unlink_dir() to bool 2023-06-19 13:59:26 +02:00
tree-mod-log.c btrfs: avoid tree mod log ENOMEM failures when we don't need to log 2023-06-19 13:59:38 +02:00
tree-mod-log.h btrfs: fix SPDX comment in tree-mod-log.h 2022-12-05 18:00:48 +01:00
ulist.c btrfs: constify ulist parameter of ulist_next() 2022-12-05 18:00:50 +01:00
ulist.h btrfs: constify ulist parameter of ulist_next() 2022-12-05 18:00:50 +01:00
uuid-tree.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
uuid-tree.h btrfs: move uuid tree prototypes to uuid-tree.h 2022-12-05 18:00:46 +01:00
verity.c btrfs: convert btrfs_read_merkle_tree_page() to use a folio 2023-09-13 18:40:54 +02:00
verity.h btrfs: move verity prototypes into verity.h 2022-12-05 18:00:47 +01:00
volumes.c btrfs: make error messages more clear when getting a chunk map 2023-12-08 08:52:20 +01:00
volumes.h btrfs: add a helper to read the superblock metadata_uuid 2023-08-21 14:54:48 +02:00
xattr.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-11-28 17:19:35 +00:00
xattr.h
zlib.c btrfs: disable allocation warnings for compression workspaces 2023-06-19 13:59:34 +02:00
zoned.c btrfs: zoned: fix lock ordering in btrfs_zone_activate() 2024-01-31 16:19:05 -08:00
zoned.h btrfs: zoned: reserve zones for an active metadata/system block group 2023-08-21 14:52:19 +02:00
zstd.c btrfs: disable allocation warnings for compression workspaces 2023-06-19 13:59:34 +02:00