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185a4caeec
15413 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
3b5f4b83c4 |
for-7.2-rc5-tag
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Merge tag 'for-7.2-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"Zoned mode:
- fix assertion and handle case of finished zone and truncated extent
- fix zone metadata write pointer on actual zone reset
- fix deadlock caused metadata writeback and transaction commit
- fix return value reuse leading to confusion about chunk
reservations
raid56 scrub:
- fix tracking of sector checksums when there are not checksums found
- fix inverted logic when submitting parity read bio
mount/remount fixes:
- fix leaking 'remount in progress' state which can break other
operations to work (qgroup rescan, autodefrag, reclaim)
- adjust using global block reserve after read-only mount when using
rescue= option
- handle missing raid stripe tree when mounted with 'ignorebadroots'
Misc:
- fix -Wmaybe-uninitialized warning in GET_CSUMS ioctl"
* tag 'for-7.2-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: raid56: fix scrub read assembly submitting no reads
btrfs: zoned: skip fully truncated ordered extents at zone finish
btrfs: initialize 'args' to avoid compiler warning in btrfs_ioctl_get_csums()
btrfs: zoned: fix missing chunk metadata reservation
btrfs: raid56: fix an incorrect csum skip during scrub
btrfs: report missing raid stripe tree root during lookup
btrfs: skip global block reserve accounting for rescue mounts
btrfs: zoned: reset meta_write_pointer on zone reset
btrfs: zoned: fix deadlock between metadata writeback and transaction commit
btrfs: fix leaking BTRFS_FS_STATE_REMOUNTING flag
|
||
|
Linus Torvalds
|
4235cb24ec |
vfs-7.2-rc5.fixes
Please consider pulling these changes from the signed vfs-7.2-rc5.fixes tag.
Thanks!
Christian
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Merge tag 'vfs-7.2-rc5.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs fixes from Christian Brauner:
- vfs: Preserve the ACL_DONT_CACHE state in forget_cached_acl().
ACL_DONT_CACHE is meant to be a permanent opt-out from ACL caching
which FUSE relies on for servers that don't negotiate FUSE_POSIX_ACL.
The helper replaced it with ACL_NOT_CACHED, silently re-enabling the
cache, and as fuse doesn't invalidate the cache for such servers a
properly timed get_acl() returned stale ACLs. Comes with a fuse
selftest reproducing this.
- pidfs:
- Preserve PIDFD_THREAD when a thread pidfd is reopened via
open_by_handle_at(). PIDFD_THREAD shares the O_EXCL bit which
do_dentry_open() strips after the flags have been validated, so
the reopened pidfd silently became a process pidfd. Comes with a
selftest.
- Add a pidfs_dentry_open() helper so the regular pidfd allocation
path and the file handle path share the code that forces O_RDWR
and reapplies the pidfd flags that do_dentry_open() strips.
- Handle FS_IOC32_GETVERSION in the compat ioctl path.
- Make pidfs_ino_lock static.
- iomap:
- Fix the block range calculation in ifs_clear_range_dirty() so a
partial clear doesn't drop the dirty state of blocks the range
only partially covers.
- Support invalidating partial folios so a partial truncate or hole
punch with blocksize < foliosize doesn't leave stale dirty bits
behind.
- Only set did_zero when iomap_zero_iter() actually zeroed
something.
- Guard ifs_set_range_dirty() and ifs_set_range_uptodate() against
zero-length ranges where the unsigned last-block calculation
underflows and bitmap_set() writes far beyond the ifs->state
allocation.
- Don't merge ioends with different io_private values as the merge
could leak or corrupt the private data of the individual ioends.
- exec:
- Raise bprm->have_execfd only once the binfmt_misc interpreter has
actually been opened. The flag was set as soon as a matching 'O'
or 'C' entry was found. If the interpreter open failed with
ENOEXEC the exec fell through to the next binary format with
have_execfd raised but no executable staged and begin_new_exec()
NULL derefed past the point of no return.
- Fix an unsigned loop counter wrap in transfer_args_to_stack() on
nommu. An overlong argument or environment string pushes bprm->p
below PAGE_SIZE, the stop index becomes zero, and the loop never
terminates, wrapping its counter and copying garbage from in
front of the page array into the new process stack.
- Make binfmt_elf_fdpic only honour the first PT_INTERP like
binfmt_elf does. Each additional PT_INTERP overwrote the previous
interpreter, leaking the name allocation and the interpreter file
reference together with the write denial open_exec() took,
leaving the file unwritable for as long as the system runs.
- overlayfs:
- Compare the full escaped xattr prefix including the trailing dot.
An xattr like "trusted.overlay.overlayfoo" was misclassified as
an escaped overlay xattr.
- Check read access to the copy_file_range() source with the
source's mounter credentials.
- super: Thawing a filesystem whose block device was frozen with
bdev_freeze() deadlocked. Dropping the last block layer freeze
reference from under s_umount ends up in fs_bdev_thaw() which
reacquires s_umount on the same task. Pin the superblock with an
active reference instead and call bdev_thaw() without holding
s_umount.
- procfs: Return EACCES instead of success when the ptrace access check
for namespace links fails.
- afs: Use afs_dir_get_block() rather than afs_dir_find_block() for
block 0 in afs_edit_dir_remove(), matching afs_edit_dir_add().
- Push the memcg gating of ->nr_cached_objects() down into the btrfs
and shmem callbacks instead of skipping every callback during
non-root memcg reclaim. The blanket check short-circuited XFS whose
inode reclaim hook is intentionally driven from per-memcg contexts to
free memcg-charged slab.
- eventpoll: Pin files while checking reverse paths.
Since struct file became SLAB_TYPESAFE_BY_RCU a concurrent close
could free and recycle the file under the check which then took and
dropped the f_lock of whatever live file now occupies that slot.
* tag 'vfs-7.2-rc5.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (24 commits)
super: fix emergency thaw deadlock on frozen block devices
pidfs: make pidfs_ino_lock static
eventpoll: pin files while checking reverse paths
fs: push nr_cached_objects memcg gating into individual filesystems
afs: Fix afs_edit_dir_remove() to get, not find, block 0
iomap: prevent ioend merge when io_private differs
iomap: add comments for ifs_clear/set_range_dirty()
iomap: fix out-of-bounds bitmap_set() with zero-length range
iomap: fix incorrect did_zero setting in iomap_zero_iter()
iomap: support invalidating partial folios
iomap: correct the range of a partial dirty clear
fs/super: fix emergency thaw double-unlock of s_umount
pidfs: handle FS_IOC32_GETVERSION in compat ioctl
ovl: check access to copy_file_range source with src mounter creds
proc: Fix broken error paths for namespace links
pidfs: add pidfs_dentry_open() helper
selftests/pidfd: check PIDFD_THREAD survives open_by_handle_at()
pidfs: preserve thread pidfds reopened by file handle
ovl: fix trusted xattr escape prefix matching
selftests/fuse: add ACL_DONT_CACHE regression test
...
|
||
|
Usama Arif
|
0ef8faff49 |
fs: push nr_cached_objects memcg gating into individual filesystems
Commit |
||
|
Linus Torvalds
|
51f247c4b2 |
for-7.2-rc4-tag
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Merge tag 'for-7.2-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"I'm catching up with the fix backlog in the development branch, so
here's a number of them and will probably send one more for this or
the next rc:
- relocation fixes:
- skip attempting compression on reloc inodes
- exclude inline extents from file extent offset checks
- fix minor memory leak after error when adding reloc root
- fix root cleanup after inserting and merging
- fix clearing folio tags after writeback
- clear logging flag of extent map before splitting
- fix unsigned 32/64 type conversions when accounting dirty metadata,
leading to continually exceeding threshold
- fix regression in 32bit compat ioctl for subvolume info
- fix type of SEARCH_TREE ioctl buffer in UAPI header
- fix expression in ASSERT expression which can be unconditionally
evaluated on some compilers
- only account delalloc bytes for regular inodes"
* tag 'for-7.2-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix GET_SUBVOL_INFO after compat refactor
btrfs: free mapping node on duplicate reloc root insert
btrfs: fix a regression where PAGECACHE_TAG_DIRTY is never cleared
btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
btrfs: fix u32 to s64 type conversion in dirty_metadata_bytes accounting
btrfs: fix NULL pointer deref during assertion in btrfs_backref_free_node()
btrfs: only account delalloc bytes for regular file inodes in btrfs_getattr()
btrfs: reject inline file extents item in get_new_location()
btrfs: do not try compression for data reloc inodes
btrfs: declare btrfs_ioctl_search_args_v2::buf as __u8
btrfs: fix reloc root cleanup in merge_reloc_roots()
btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()
|
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|
Mykola Lysenko
|
c4c0673e4c |
btrfs: raid56: fix scrub read assembly submitting no reads
Commit |
||
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Johannes Thumshirn
|
ab602da96a |
btrfs: zoned: skip fully truncated ordered extents at zone finish
A fully truncated ordered extent (truncated_len == 0) wrote no data, so its ->csum_list is empty and btrfs_finish_ordered_zoned() trips: assertion failed: !list_empty(&ordered->csum_list), in fs/btrfs/zoned.c:2141 Since commit |
||
|
Paul E. McKenney
|
0d214d14be |
btrfs: initialize 'args' to avoid compiler warning in btrfs_ioctl_get_csums()
[COMPILER WARNING]
With GCC 11.5.0 and KASAN enabled on ARM, the following warning is
triggered during compiling:
In file included from ./include/asm-generic/rwonce.h:26,
from ./arch/arm64/include/asm/rwonce.h:81,
from ./include/linux/compiler.h:369,
from ./include/linux/array_size.h:5,
from ./include/linux/kernel.h:16,
from fs/btrfs/ioctl.c:6:
In function ‘instrument_copy_from_user_before’,
inlined from ‘_inline_copy_from_user’ at ./include/linux/uaccess.h:184:2,
inlined from ‘copy_from_user’ at ./include/linux/uaccess.h:222:9,
inlined from ‘btrfs_ioctl_get_csums.isra’ at fs/btrfs/ioctl.c:5220:6:
./include/linux/kasan-checks.h:38:27: warning: ‘args’ may be used uninitialized [-Wmaybe-uninitialized]
38 | #define kasan_check_write __kasan_check_write
./include/linux/instrumented.h:146:9: note: in expansion of macro ‘kasan_check_write’
146 | kasan_check_write(to, n);
| ^~~~~~~~~~~~~~~~~
fs/btrfs/ioctl.c: In function ‘btrfs_ioctl_get_csums.isra’:
./include/linux/kasan-checks.h:20:6: note: by argument 1 of type ‘const volatile void *’ to ‘__kasan_check_write’ declared here
20 | bool __kasan_check_write(const volatile void *p, unsigned int size);
| ^~~~~~~~~~~~~~~~~~~
fs/btrfs/ioctl.c:5201:43: note: ‘args’ declared here
5201 | struct btrfs_ioctl_get_csums_args args;
| ^~~~
[POSSIBLE FALSE ALERTS]
This seems to be a false alert from certain GCC versions.
The @args is immediately over-written by copy_from_user(), and there is
no code touching that @args until copy_from_user() finished correctly.
[WORKAROUND]
Initialize 'args' to zero, which suppresses the warning.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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|
Guanghui Yang
|
8bc4d72096 |
btrfs: zoned: fix missing chunk metadata reservation
reserve_chunk_space() stores the return value of
btrfs_zoned_activate_one_bg() in ret. The helper can return 1 after
successfully activating a block group, but ret is later used to decide
whether to reserve metadata for chunk tree updates.
As a result, successful activation skips btrfs_block_rsv_add() and leaves
trans->chunk_bytes_reserved unchanged. Use a separate variable for the
activation result so positive success does not affect the later
reservation. Keep activation failures in ret instead of returning early so
the function uses the common tail path.
Fixes:
|
||
|
Qu Wenruo
|
330dcc553f |
btrfs: raid56: fix an incorrect csum skip during scrub
Commit |
||
|
Dongjiang Zhu
|
c438d34ec1 |
btrfs: report missing raid stripe tree root during lookup
When rescue=ibadroots ignores a failure to load the raid stripe tree root, fs_info->stripe_root remains NULL. After the rescue mount proceeds, reading file data that requires the raid stripe tree reaches btrfs_get_raid_extent_offset(). Currently btrfs_search_slot() handles the NULL root and returns -EINVAL. This avoids a NULL pointer dereference, but provides no diagnostic and incorrectly describes missing filesystem metadata as an invalid argument. Check stripe_root before allocating a path, emit a rate-limited error with the logical address, and return -EUCLEAN. Lookups with a valid stripe root are unchanged. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Dongjiang Zhu <zhudongjiang@fnnas.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Dongjiang Zhu
|
51a0e83998 |
btrfs: skip global block reserve accounting for rescue mounts
[BUG] Mounting with rescue=ibadroots after corrupting the block group tree root triggers a NULL pointer dereference: BUG: kernel NULL pointer dereference, address: 0000000000000100 RIP: 0010:btrfs_update_global_block_rsv+0x9d/0x1c0 [btrfs] Call Trace: fill_dummy_bgs+0xd4/0x120 [btrfs] open_ctree+0xc6e/0x1ca0 [btrfs] btrfs_get_tree+0x50d/0xa40 [btrfs] The same crash occurs with a corrupted raid stripe tree root, via btrfs_read_block_groups() instead of fill_dummy_bgs(). [CAUSE] With rescue=ibadroots, btrfs_read_roots() allows the mount to continue when either root cannot be read, leaving the corresponding root pointer NULL while its on-disk feature bit remains set. btrfs_update_global_block_rsv() then dereferences the missing root based on the feature bit alone. [FIX] Rescue mounts are fully read-only and cannot start transactions, so the global reserve is never consumed. Under btrfs_is_full_ro(), mark the reserve as full and return before performing the accounting. And since we need to check if the fs is mount fully RO, export fs_is_full_ro() as btrfs_is_full_ro(), and move it to fs.h. Fixes: |
||
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Johannes Thumshirn
|
5fabb1cf25 |
btrfs: zoned: reset meta_write_pointer on zone reset
btrfs_reset_unused_block_groups() resets a block group's zone and sets
alloc_offset back to 0 so the space can be reused, but it leaves
meta_write_pointer pointing at the previous end of the zone.
Once the block group is reactivated and reused for metadata, newly
allocated tree blocks live before that stale write pointer.
btrfs_check_meta_write_pointer() then sees them behind the write pointer,
so they can never be written out in sequential order: the dirty extent
buffers are stranded and pin their btree_inode folios until unmount.
Reset meta_write_pointer back to the start of the block group for
metadata and system block groups.
Fixes:
|
||
|
Johannes Thumshirn
|
1ebe51c29f |
btrfs: zoned: fix deadlock between metadata writeback and transaction commit
When writing out metadata extent buffers in a zoned filesystem,
btree_writepages() holds fs_info->zoned_meta_io_lock across the whole
writeback loop, including the call to btrfs_check_meta_write_pointer() ->
check_bg_is_active().
For the tree-log block group, check_bg_is_active() may fail to activate
the zone and fall back to btrfs_zone_finish_one_bg() to free an active
zone. That path waits for the running transaction to commit while still
holding zoned_meta_io_lock, but the committer needs that same lock to
write out the tree extents, so the two tasks deadlock:
Task A (kworker, metadata writeback) Task B (fsstress, transaction commit)
------------------------------------ -------------------------------------
wb_workfn() btrfs_commit_transaction(T)
btree_writepages() btrfs_write_and_wait_transaction()
btrfs_zoned_meta_io_lock() btrfs_write_marked_extents()
btrfs_check_meta_write_pointer() btree_writepages()
check_bg_is_active() [treelog_bg] btrfs_zoned_meta_io_lock()
btrfs_zone_finish_one_bg() <blocks on zoned_meta_io_lock,
btrfs_zone_finish() held by Task A>
do_zone_finish()
btrfs_inc_block_group_ro()
btrfs_wait_for_commit()
<blocks waiting for commit
of transaction T, done by
Task B>
The sibling branch in check_bg_is_active() already drops zoned_meta_io_lock
around do_zone_finish() for this exact reason. Do the same in the tree-log
branch: release the lock around btrfs_zone_finish_one_bg() and re-acquire
it afterwards. The lock only protects fs_info->active_{meta,system}_bg,
which this branch does not touch, and ctx->zoned_bg keeps a reference to
the block group across the unlock, so nothing is lost while the lock
is dropped.
This hang occasionally reproduces with fstests generic/475 on a zoned
btrfs filesystem.
Fixes:
|
||
|
Qu Wenruo
|
6881f45d0e |
btrfs: fix leaking BTRFS_FS_STATE_REMOUNTING flag
[BUG]
The following script can lead to unexpected qgroup rescan failure:
# mkfs.btrfs -f -O quota $dev
# mount $dev $mnt
# mount -o remount,rescue=ibadroots $mnt
^^^^^ This above command is expected to fail
# btrfs quota rescan -w $mnt
^^^^^ The above qgroup rescan is not expected to fail
# btrfs qgroup show $mnt
WARNING: qgroup data inconsistent, rescan recommended
Qgroupid Referenced Exclusive Path
-------- ---------- --------- ----
0/5 16.00KiB 16.00KiB <toplevel>
The above short script will be converted to a proper fstests case.
[CAUSE]
Inside btrfs_reconfigure(), if either btrfs_check_options() or
btrfs_check_features() failed, we will always have
BTRFS_FS_STATE_REMOUNTING set for the fs until the next successful
remount.
That BTRFS_FS_STATE_REMOUNTING flag will interrupt several operations,
including:
- Qgroup rescan
- Auto defrag
- Space reclaim
[FIX]
Change the error handling of btrfs_check_options() and
btrfs_check_features() to goto restore label.
Fixes:
|
||
|
Linus Torvalds
|
7059bdf4f0 |
for-7.2-rc3-tag
-----BEGIN PGP SIGNATURE----- iQJPBAABCgA5FiEE8rQSAMVO+zA4DBdWxWXV+ddtWDsFAmpVwFMbFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMiwyAAoJEMVl1fnXbVg70fgP/AqgKPhUBx5SAmTvFsno 9vqa1g68BZtpsGeA6Djo2v3cCaRlFRwW9kcnKCiY25sNZEAtcsC+z3oT5ft1zRZE ZVIMFE4zQTGmjGNo/4AV2R7utXud+pq5HjQCiu5Ihjkl7/Qf8x1szI/tQzfXoHes KZfx97/F3oaC11b2+v/euey25jnRdrzus/5GvE2gMEbTGdogpIsBArLgKMecZeoZ NISD5STVU9TKUe6Dw40ivC0CAb5RdiSJabF4vN2/u/pXnzxFTnJ336LebLljgzzE c4PPFDYavGo2CRRyBSsxD6FLSN+RJUdZT4+L9GcPMnx20YcbhUF9NiW1QvQzmYcd +uvvCjtbBZSc/pyu6FOZcD5Ib9WkWjGkYEnq2knXDUMt5MDNSh4yo1D76zrb+yuR ez+YvcDBpYjmqOzlShjp1AhbpvaKYIEC0TW+1grS8vZVVy1vlVwqyC3ubh6ZpAJp Q/y50oS9nQkBUfnOdhQ1jhO+xHFzX3xnSzImqoX+ogVQKDfnEFeezaYcna/CDAeL jDP81abheSaO06+2gzlkSUXPJKh0TVwbyd34EQzs4Zft20UtpeHUfi5fCPzYZRGZ rRY/HXaztMBtbEOEzbjS/J0y1Y3t/DXcKRonftpudXdKP92DsNdOLK7y0vtI1A4i al79WpL+VaEw2+ByIZ3uanl/ =A35I -----END PGP SIGNATURE----- Merge tag 'for-7.2-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux Pull btrfs fixes from David Sterba: - fix root structure leak after relocation error - fix optimization when checksums are read from commit root, fall back to checksum root during relocation - in tree-checker, validate length of inode reference in items - validate properties before setting them - validate free space cache entries on load - transaction abort fixes - fix printing of internal trees as signed numbers - add error messages after critical lzo compression errors * tag 'for-7.2-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: print-tree: print header owner as signed btrfs: decentralize transaction aborts in create_reloc_root() btrfs: tree-checker: validate INODE_REF's namelen btrfs: lzo: add error message for invalid headers btrfs: fallback to transaction csum tree on a commit root csum miss btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots() btrfs: reject free space cache with more entries than pages btrfs: fix transaction abort logic in btrfs_fileattr_set() btrfs: validate properties before setting them |
||
|
Daan De Meyer
|
75a41e3e51 |
btrfs: fix GET_SUBVOL_INFO after compat refactor
btrfs_search_slot() returns a positive value when the search key does
not exactly match an item. This is expected here, since offset 0 is used
to find the first ROOT_BACKREF for the subvolume and the actual key has
the parent root ID as its offset.
Before the compat ioctl refactoring, the native handler still copied the
filled structure to userspace when the search returned 1. After the
lookup was moved to a shared helper, both native and compat callers
treat the positive return value as a failure and skip copy_to_user(),
leaving BTRFS_IOC_GET_SUBVOL_INFO unusable for non-top-level
subvolumes.
Reset ret after successfully validating and reading the ROOT_BACKREF so
the helper reports success and both callers copy the result to
userspace.
Fixes:
|
||
|
Guanghui Yang
|
6a8269b645 |
btrfs: free mapping node on duplicate reloc root insert
__add_reloc_root() allocates a mapping_node before inserting it into
rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it
returns the existing rb_node and leaves the newly allocated node unlinked.
The error path then returns -EEXIST without freeing the new node. Since
the node was never inserted into reloc_root_tree, the later cleanup in
put_reloc_control() cannot find it either.
Free the newly allocated node before returning -EEXIST.
The callers currently assert that -EEXIST should not happen, so this is a
defensive cleanup for an unexpected duplicate insert path. If the path is
ever reached, the local allocation should still be released.
Fixes:
|
||
|
Qu Wenruo
|
9b73625a4f |
btrfs: fix a regression where PAGECACHE_TAG_DIRTY is never cleared
[BUG] The following script (already submitted as generic/798) will report incorrect dirty page numbers, with 64K page size systems and 4K fs block size: # mkfs.btrfs -s 4k -f $dev # mount $dev $mnt # xfs_io -f -c "pwrite 0 64K" -c fsync -c "cachestat 0 64K" $mnt/foobar Cached: 1, Dirty: 1, Writeback: 0, Evicted: 0, Recently Evicted: 0 Note that the dirtied page number is still 1. [CAUSE] The cachestat() goes through the XArray of the page cache, but instead of checking each folio's flag, it uses the PAGECACHE_TAG_DIRTY tag to report dirty pages. Since commit |
||
|
Leo Martins
|
5eff4d5b17 |
btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
When btrfs_drop_extent_map_range() splits an extent map, the new split maps inherit the original map's flags through a local 'flags' variable. Commit |
||
|
Dave Chen
|
8b5a09ceb6 |
btrfs: fix u32 to s64 type conversion in dirty_metadata_bytes accounting
The percpu_counter dirty_metadata_bytes is updated by negating eb->len and passing it to percpu_counter_add_batch(), whose amount parameter is s64. Since commit |
||
|
Filipe Manana
|
f0c1f14cc1 |
btrfs: fix NULL pointer deref during assertion in btrfs_backref_free_node()
In btrfs_backref_free_node() we have the following assertion:
ASSERT(node->eb == NULL, "node->eb->start=%llu", node->eb->start);
and a user reported the following crash:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 10422 Comm: syz.0.17 Not tainted 7.1.0-02765-g6b5a2b7d9bc1-dirty #44 PREEMPT(full)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:btrfs_backref_free_node fs/btrfs/backref.c:3057 [inline]
RIP: 0010:btrfs_backref_free_node+0xb9/0x200 fs/btrfs/backref.c:3051
Code: 00 fc ff (...)
RSP: 0018:ffa0000006b0f3c0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff840eb78b
RDX: 0000000000000000 RSI: ffffffff840eafa5 RDI: ff110000742ab768
RBP: ff110000742ab700 R08: 0000000000000000 R09: 0000000000000000
R10: ff110000742ab700 R11: 00000000000a81f9 R12: ff11000107a92020
R13: ff1100005c182ea8 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000555575536500(0000) GS:ff11000183985000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa3d0e9d580 CR3: 000000002232a000 CR4: 0000000000753ef0
PKRU: 00000000
Call Trace:
<TASK>
btrfs_backref_cleanup_node+0x27/0x30 fs/btrfs/backref.c:3133
relocate_tree_block fs/btrfs/relocation.c:2604 [inline]
relocate_tree_blocks+0x11b0/0x1a20 fs/btrfs/relocation.c:2707
relocate_block_group+0x499/0xf30 fs/btrfs/relocation.c:3635
do_nonremap_reloc fs/btrfs/relocation.c:5323 [inline]
btrfs_relocate_block_group+0x1749/0x5fb0 fs/btrfs/relocation.c:5490
btrfs_relocate_chunk+0x12b/0x950 fs/btrfs/volumes.c:3647
__btrfs_balance fs/btrfs/volumes.c:4586 [inline]
btrfs_balance+0x1c7f/0x55c0 fs/btrfs/volumes.c:4973
btrfs_ioctl_balance fs/btrfs/ioctl.c:3474 [inline]
btrfs_ioctl+0x38a4/0x5d20 fs/btrfs/ioctl.c:5570
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x11f/0x860 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb38e3b56dd
Code: 02 b8 ff (...)
RSP: 002b:00007fff04115788 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb38f6b0020 RCX: 00007fb38e3b56dd
RDX: 00002000000003c0 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fb38e451b48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb38f6b0020 R15: 00007fb38f6b002c
</TASK>
It seems that this happens on some systems for some reason, when the
ASSERT() macro calls the inline function verify_assert_printk_format()
to evaluate the format string and arguments, causing the NULL pointer
dereference on node->eb.
So change the assertion to check for a NULL node->eb before dereferencing
it. Also, while at it, make the assertion more useful by printing the
owner of the extent buffer as well as its level.
Reported-by: Yue Sun <samsun1006219@gmail.com>
Link: https://lore.kernel.org/linux-btrfs/20260626065542.38413-1-samsun1006219@gmail.com/
Fixes:
|
||
|
Dave Chen
|
9411aafdf3 |
btrfs: only account delalloc bytes for regular file inodes in btrfs_getattr()
btrfs_getattr() unconditionally reads BTRFS_I(inode)->new_delalloc_bytes
and adds it (sector-aligned) to stat->blocks for every inode type.
However, new_delalloc_bytes lives in a union with last_dir_index_offset:
union {
u64 new_delalloc_bytes; /* files only */
u64 last_dir_index_offset; /* directories only */
};
For a directory inode this memory holds last_dir_index_offset, which is
set during directory logging (e.g. flush_dir_items_batch()) to the
offset of the last logged BTRFS_DIR_INDEX_KEY. That offset grows with
the number of entries ever created in the directory (dir indexes are
monotonic and never reused), so it can be arbitrarily large.
As a result, after a directory has been logged (e.g. via an fsync that
triggers directory logging), btrfs_getattr() reports inflated st_blocks
for that directory. The inflation is purely in-core and disappears
after the inode is evicted and reloaded (btrfs_alloc_inode() zeroes the
union), e.g. after a remount.
Reproducer (on a btrfs filesystem):
D=/mnt/btrfs/d
mkdir -p $D
for i in $(seq 1 20000); do touch $D/f$i; done
sync # commit, push dir index high
touch $D/trigger # dirty the dir in a new transaction
xfs_io -c fsync $D # log the directory -> sets last_dir_index_offset
stat -c '%b' $D # st_blocks is now inflated (e.g. 40)
# umount + mount -> st_blocks drops back to the correct value
The evict path already knows this union is type-dependent and guards the
corresponding WARN_ON with !S_ISDIR() in btrfs_destroy_inode(); only
btrfs_getattr() was missing the equivalent check.
Only read new_delalloc_bytes for regular files, which are the only
inodes that ever set it.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Dave Chen <davechen@synology.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
||
|
Qu Wenruo
|
800b519602 |
btrfs: reject inline file extents item in get_new_location()
Commit |
||
|
Qu Wenruo
|
ae4316f332 |
btrfs: do not try compression for data reloc inodes
[BUG]
There is a syzbot report that the check inside get_new_location()
triggered:
BTRFS info (device loop0): found 31 extents, stage: move data extents
BTRFS info (device loop0): leaf 8908800 gen 16 total ptrs 28 free space 1676 owner 18446744073709551607
item 0 key (256 INODE_ITEM 0) itemoff 3835 itemsize 160
inode generation 5 transid 0 size 0 nbytes 0
block group 0 mode 40755 links 1 uid 0 gid 0
rdev 0 sequence 0 flags 0x0
atime 1669132761.0
ctime 1669132761.0
mtime 1669132761.0
otime 0.0
item 1 key (256 INODE_REF 256) itemoff 3823 itemsize 12
index 0 name_len 2
item 2 key (258 INODE_ITEM 0) itemoff 3663 itemsize 160
inode generation 1 transid 16 size 733184 nbytes 106496
block group 0 mode 100600 links 0 uid 0 gid 0
rdev 0 sequence 24 flags 0x18
item 3 key (258 EXTENT_DATA 0) itemoff 3595 itemsize 68
generation 16 type 0
inline extent data size 47 ram_bytes 4096 compression 1
[...]
item 27 key (18446744073709551611 ORPHAN_ITEM 258) itemoff 2376 itemsize 0
BTRFS error (device loop0): unexpected non-zero offset in file extent item for data reloc inode 258 key offset 0 offset 9277520992061368337
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
[CAUSE]
The above dump tree shows the first file extent item is inlined, which
should make no sense for data reloc inodes, as such inodes just
represent where the data extents are in the relocation destination chunk.
However the relocation path preallocates space for each block,
then dirties them, cluster by cluster.
It's possible to have a single block at the beginning of the block
group, and no other block in the same cluster.
So relocation will preallocate a file extent for that block and dirty
the first block. Then memory pressure forces the data reloc inode to be
written back, before any other blocks are dirtied/allocated.
Finally commit
|
||
|
Filipe Manana
|
b78fe9563e |
btrfs: fix reloc root cleanup in merge_reloc_roots()
If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this while reviewing another patch, and it's correct (see the Link tag below). Also, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless the root points to the reloc root we have. Fix this by using clear_reloc_root(), which issues the memory barrier after setting the root's ->reloc_root to NULL and before clearing the bit BTRFS_ROOT_DEAD_RELOC_TREE from the root. Link: https://sashiko.dev/#/patchset/cf84f1a217c719e25b6b69e4298dd7afd36c9427.1781194426.git.fdmanana%40suse.com Reviewed-by: Boris Burkov <boris@bur.io> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Filipe Manana
|
83201804ef |
btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()
If during relocation we fail in insert_dirty_subvol() because
btrfs_update_reloc_root() returned an error, we will leave a root's
reloc_root field pointing to a reloc root that was freed instead of NULL,
resulting later in a use-after-free, or double free attempt during
unmount.
The sequence of steps is this:
1) During relocation the call to btrfs_update_reloc_root() in
insert_dirty_subvol() fails, so insert_dirty_subvol() returns the
error to merge_reloc_root() without adding the root to the list
rc->dirty_subvol_roots;
2) Then merge_reloc_root() aborts the current transaction because
insert_dirty_subvol() returned an error;
3) Up the call chain, merge_reloc_roots() gets the error, adds the
reloc root for root X to the local reloc_roots list and jumps to the
'out' label, where it calls free_reloc_roots() to free all the reloc
roots in the local reloc_roots list. This frees the reloc root for
root X;
4) We go up the call chain to relocate_block_group() which calls
clean_dirty_subvols() to go over dirty roots and set their
->reloc_root field to NULL, but root X is not in the dirty_subvol_roots
list, so its ->reloc_root still points to a reloc root;
5) Relocation finishes, with an error and a transaction abort, but the
->reloc_root field for root X still points to the reloc root that was
freed in step 3;
6) When unmounting the fs we end up calling:
btrfs_free_fs_roots()
btrfs_drop_and_free_fs_root()
--> calls btrfs_put_root() against root X's ->reloc_root
which is not NULL and points to the already freed
reloc root in step 4 above
Resulting in a use-after-free to a double free attempt.
Syzbot reported this with the following dmesg/syslog:
[ 106.004389][ T5339] BTRFS error (device loop0 state A): Transaction aborted (error -5)
[ 106.014266][ T5339] BTRFS: error (device loop0 state A) in merge_reloc_root:1655: errno=-5 IO failure
[ 106.021891][ T1061] BTRFS error (device loop0 state A): error while writing out transaction: -5
[ 106.026964][ T1061] BTRFS warning (device loop0 state A): Skipping commit of aborted transaction.
[ 106.033807][ T5340] BTRFS error (device loop0 state A): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
[ 106.039265][ T1061] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure
[ 106.044382][ T5339] BTRFS info (device loop0 state EA): forced readonly
[ 106.074329][ T5339] BTRFS: error (device loop0 state EA) in merge_reloc_roots:1887: errno=-5 IO failure
[ 106.081004][ T5356] BTRFS info (device loop0 state EA): scrub: started on devid 1
[ 106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with status: -30
[ 106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with status: -30
[ 106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem 3a375e4e-b156-4d76-a2ad-16e198ce1409
[ 106.682946][ T5338] ==================================================================
[ 106.686574][ T5338] BUG: KASAN: slab-use-after-free in btrfs_put_root+0x2f/0x250
[ 106.690090][ T5338] Write of size 4 at addr ffff88803f978630 by task syz.0.0/5338
[ 106.693173][ T5338]
[ 106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
[ 106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 106.694300][ T5338] Call Trace:
[ 106.694308][ T5338] <TASK>
[ 106.694314][ T5338] dump_stack_lvl+0xe8/0x150
[ 106.694331][ T5338] print_address_description+0x55/0x1e0
[ 106.694343][ T5338] ? btrfs_put_root+0x2f/0x250
[ 106.694358][ T5338] print_report+0x58/0x70
[ 106.694368][ T5338] kasan_report+0x117/0x150
[ 106.694384][ T5338] ? btrfs_put_root+0x2f/0x250
[ 106.694399][ T5338] kasan_check_range+0x264/0x2c0
[ 106.694416][ T5338] btrfs_put_root+0x2f/0x250
[ 106.694430][ T5338] btrfs_drop_and_free_fs_root+0x160/0x210
[ 106.694447][ T5338] btrfs_free_fs_roots+0x2f9/0x3c0
[ 106.694464][ T5338] ? __pfx_btrfs_free_fs_roots+0x10/0x10
[ 106.694479][ T5338] ? free_root_pointers+0x5bf/0x5f0
[ 106.694494][ T5338] close_ctree+0x798/0x12d0
[ 106.694511][ T5338] ? __pfx_close_ctree+0x10/0x10
[ 106.694526][ T5338] ? _raw_spin_unlock_irqrestore+0x74/0x80
[ 106.694599][ T5338] ? rcu_preempt_deferred_qs_irqrestore+0x906/0xbc0
[ 106.694620][ T5338] ? __rcu_read_unlock+0x83/0xe0
[ 106.694636][ T5338] ? btrfs_put_super+0x48/0x1c0
[ 106.694652][ T5338] ? __pfx_btrfs_put_super+0x10/0x10
[ 106.694667][ T5338] generic_shutdown_super+0x13d/0x2d0
[ 106.694682][ T5338] kill_anon_super+0x3b/0x70
[ 106.694695][ T5338] btrfs_kill_super+0x41/0x50
[ 106.694710][ T5338] deactivate_locked_super+0xbc/0x130
[ 106.694722][ T5338] cleanup_mnt+0x437/0x4d0
[ 106.694736][ T5338] ? _raw_spin_unlock_irq+0x23/0x50
[ 106.694752][ T5338] task_work_run+0x1d9/0x270
[ 106.694769][ T5338] ? __pfx_task_work_run+0x10/0x10
[ 106.694784][ T5338] ? do_raw_spin_unlock+0x4d/0x210
[ 106.694802][ T5338] do_exit+0x70f/0x22c0
[ 106.694817][ T5338] ? trace_irq_disable+0x3b/0x140
[ 106.694835][ T5338] ? __pfx_do_exit+0x10/0x10
[ 106.694848][ T5338] ? preempt_schedule_thunk+0x16/0x30
[ 106.694863][ T5338] ? preempt_schedule_common+0x82/0xd0
[ 106.694878][ T5338] ? preempt_schedule_thunk+0x16/0x30
[ 106.694892][ T5338] do_group_exit+0x21b/0x2d0
[ 106.694906][ T5338] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 106.694918][ T5338] __x64_sys_exit_group+0x3f/0x40
[ 106.694932][ T5338] x64_sys_call+0x221a/0x2240
[ 106.694944][ T5338] do_syscall_64+0x174/0x580
[ 106.694954][ T5338] ? clear_bhb_loop+0x40/0x90
[ 106.694967][ T5338] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 106.694978][ T5338] RIP: 0033:0x7f958ef9ce59
[ 106.694988][ T5338] Code: Unable to access opcode bytes at 0x7f958ef9ce2f.
[ 106.694994][ T5338] RSP: 002b:00007fffd4058318 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[ 106.695008][ T5338] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f958ef9ce59
[ 106.695015][ T5338] RDX: 00007f958c3f8000 RSI: 0000000000000000 RDI: 0000000000000000
[ 106.695022][ T5338] RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f958f1e73e0
[ 106.695028][ T5338] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 106.695034][ T5338] R13: 00007f958f1e73e0 R14: 0000000000000003 R15: 00007fffd40583d0
[ 106.695046][ T5338] </TASK>
[ 106.695050][ T5338]
[ 106.821635][ T5338] Allocated by task 1061:
[ 106.823446][ T5338] kasan_save_track+0x3e/0x80
[ 106.825498][ T5338] __kasan_kmalloc+0x93/0xb0
[ 106.827381][ T5338] __kmalloc_cache_noprof+0x31c/0x660
[ 106.829525][ T5338] btrfs_alloc_root+0x75/0x930
[ 106.831458][ T5338] read_tree_root_path+0x127/0xb00
[ 106.833556][ T5338] btrfs_read_tree_root+0x34/0x60
[ 106.835553][ T5338] create_reloc_root+0x6b3/0xcb0
[ 106.837556][ T5338] btrfs_init_reloc_root+0x2ec/0x4b0
[ 106.839557][ T5338] record_root_in_trans+0x2ab/0x350
[ 106.841685][ T5338] btrfs_record_root_in_trans+0x15c/0x180
[ 106.844237][ T5338] start_transaction+0x39c/0x1820
[ 106.846638][ T5338] btrfs_finish_one_ordered+0x88e/0x2680
[ 106.849436][ T5338] btrfs_work_helper+0x37b/0xc20
[ 106.851549][ T5338] process_scheduled_works+0xb5d/0x1860
[ 106.853807][ T5338] worker_thread+0xa53/0xfc0
[ 106.855773][ T5338] kthread+0x389/0x470
[ 106.857548][ T5338] ret_from_fork+0x514/0xb70
[ 106.859493][ T5338] ret_from_fork_asm+0x1a/0x30
[ 106.861504][ T5338]
[ 106.862527][ T5338] Freed by task 5339:
[ 106.864224][ T5338] kasan_save_track+0x3e/0x80
[ 106.866180][ T5338] kasan_save_free_info+0x46/0x50
[ 106.868371][ T5338] __kasan_slab_free+0x5c/0x80
[ 106.870462][ T5338] kfree+0x1c5/0x640
[ 106.872180][ T5338] __del_reloc_root+0x341/0x3b0
[ 106.874290][ T5338] free_reloc_roots+0x5f/0x90
[ 106.876282][ T5338] merge_reloc_roots+0x73f/0x8a0
[ 106.878489][ T5338] relocate_block_group+0xbcc/0xe70
[ 106.880742][ T5338] do_nonremap_reloc+0xa8/0x5b0
[ 106.882885][ T5338] btrfs_relocate_block_group+0x7e6/0xc40
[ 106.885336][ T5338] btrfs_relocate_chunk+0x115/0x820
[ 106.887502][ T5338] __btrfs_balance+0x1db0/0x2ae0
[ 106.889543][ T5338] btrfs_balance+0xaf3/0x11b0
[ 106.891456][ T5338] btrfs_ioctl_balance+0x3d3/0x610
[ 106.893672][ T5338] __se_sys_ioctl+0xfc/0x170
[ 106.895530][ T5338] do_syscall_64+0x174/0x580
[ 106.897518][ T5338] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 106.900101][ T5338]
[ 106.901123][ T5338] The buggy address belongs to the object at ffff88803f978000
[ 106.901123][ T5338] which belongs to the cache kmalloc-4k of size 4096
[ 106.906907][ T5338] The buggy address is located 1584 bytes inside of
[ 106.906907][ T5338] freed 4096-byte region [ffff88803f978000, ffff88803f979000)
[ 106.912980][ T5338]
[ 106.914022][ T5338] The buggy address belongs to the physical page:
[ 106.916716][ T5338] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f978
[ 106.920390][ T5338] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 106.923834][ T5338] flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
[ 106.927104][ T5338] page_type: f5(slab)
[ 106.928898][ T5338] raw: 04fff00000000040 ffff88801ac42140 dead000000000122 0000000000000000
[ 106.932507][ T5338] raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
[ 106.936193][ T5338] head: 04fff00000000040 ffff88801ac42140 dead000000000122 0000000000000000
[ 106.939856][ T5338] head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
[ 106.943601][ T5338] head: 04fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
[ 106.947268][ T5338] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
[ 106.950988][ T5338] page dumped because: kasan: bad access detected
[ 106.953710][ T5338] page_owner tracks the page as allocated
[ 106.956198][ T5338] page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 24, tgid 24 (kworker/u4:2), ts 105728970387, free_ts 29540875453
[ 106.964984][ T5338] post_alloc_hook+0x22d/0x280
[ 106.966956][ T5338] get_page_from_freelist+0x2593/0x2610
[ 106.969307][ T5338] __alloc_frozen_pages_noprof+0x18d/0x380
[ 106.971839][ T5338] allocate_slab+0x77/0x660
[ 106.973709][ T5338] refill_objects+0x339/0x3d0
[ 106.975696][ T5338] __pcs_replace_empty_main+0x321/0x720
[ 106.978136][ T5338] __kmalloc_node_track_caller_noprof+0x572/0x7b0
[ 106.981009][ T5338] __alloc_skb+0x2c1/0x7d0
[ 106.982983][ T5338] nsim_dev_trap_report_work+0x29a/0xb90
[ 106.985356][ T5338] process_scheduled_works+0xb5d/0x1860
[ 106.987710][ T5338] worker_thread+0xa53/0xfc0
[ 106.989847][ T5338] kthread+0x389/0x470
[ 106.991727][ T5338] ret_from_fork+0x514/0xb70
[ 106.993722][ T5338] ret_from_fork_asm+0x1a/0x30
[ 106.995900][ T5338] page last free pid 77 tgid 77 stack trace:
[ 106.998479][ T5338] __free_frozen_pages+0xc1c/0xd30
[ 107.000819][ T5338] vfree+0x1d1/0x2f0
[ 107.002631][ T5338] delayed_vfree_work+0x55/0x80
[ 107.004848][ T5338] process_scheduled_works+0xb5d/0x1860
[ 107.007366][ T5338] worker_thread+0xa53/0xfc0
[ 107.009388][ T5338] kthread+0x389/0x470
[ 107.011177][ T5338] ret_from_fork+0x514/0xb70
[ 107.013313][ T5338] ret_from_fork_asm+0x1a/0x30
[ 107.015454][ T5338]
[ 107.016460][ T5338] Memory state around the buggy address:
[ 107.019052][ T5338] ffff88803f978500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.022691][ T5338] ffff88803f978580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.026264][ T5338] >ffff88803f978600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.029721][ T5338] ^
[ 107.032062][ T5338] ffff88803f978680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.035547][ T5338] ffff88803f978700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 107.038865][ T5338] ==================================================================
Fix this by resetting a root's ->reloc_root if we get an error while
trying to merge a reloc root.
Reported-by: syzbot+b3d472d13f9d7bf20669@syzkaller.appspotmail.com
Link: https://lore.kernel.org/linux-btrfs/6a1ebde9.c1435f33.112120.0176.GAE@google.com/
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
||
|
Qu Wenruo
|
c0041b502e |
btrfs: print-tree: print header owner as signed
When dumping a tree block, btrfs_header::owner is printed as unsigned, which can result in numbers that are hard to read, e.g.: BTRFS info (device loop0): leaf 8908800 gen 16 total ptrs 28 free space 1676 owner 18446744073709551607 For the above output, 18446744073709551607 is (s64)-9, the root id of data reloc tree. Despite those predefined root ids that are already negative, existing subvolume trees will not have any negative values, as subvolume trees can only utilize the lower 48 bits, so there will be no output change for existing subvolumes, thus no extra confusion. Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Sun YangKai <sunk67188@gmail.com> Reviewed-by: Boris Burkov <boris@bur.io> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Johannes Thumshirn
|
9e37d187e1 |
btrfs: decentralize transaction aborts in create_reloc_root()
Decentralize transaction aborts in create_reloc_root(), so that it is obvious which call failed and what caused the transaction abort. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Weiming Shi
|
3dc22abc21 |
btrfs: tree-checker: validate INODE_REF's namelen
[BUG] A crafted btrfs image can trigger the following crash: BUG: unable to handle page fault for address: ffffd1dc42884000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page CPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full) 46af0a92938a63be7132e0dfd71e62327c51d5c2 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:memcpy+0xc/0x10 Call Trace: <TASK> read_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f] btrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f] reconnect_path+0x165/0x390 exportfs_decode_fh_raw+0x337/0x400 ? drop_caches_sysctl_handler+0xb0/0xb0 </TASK> ---[ end trace 0000000000000000 ]--- RIP: 0010:memcpy+0xc/0x10 Kernel panic - not syncing: Fatal exception [CAUSE] TThe crafted image has the following corrupted INODE_REF item: item 9 key (258 INODE_REF 257) itemoff 11544 itemsize 4106 index 2 namelen 4096 name: d\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000 The itemsize matches the namelen, but the namelen is 4096, way larger than normal name length limit (BTRFS_NAME_LEN, 255). Meanwhile the memory of the @name is only 255 byte sized, this will cause out-of-boundary access, and cause the above crash. [FIX] Add extra namelen verification for INODE_REF, just like what we have done in ROOT_REF checks. Now the crafted image can be rejected gracefully: BTRFS critical (device dm-2): corrupt leaf: root=5 block=30572544 slot=14 ino=259, invalid inode ref name length, has 4096 expect [1, 255] BTRFS error (device dm-2): read time tree block corruption detected on logical 30572544 mirror 2 Reported-by: Xiang Mei <xmei5@asu.edu> Link: https://lore.kernel.org/linux-btrfs/aik0hEV6ehKx6Ldv@Air.local/ Acked-by: Weiming Shi <bestswngs@gmail.com> Signed-off-by: Weiming Shi <bestswngs@gmail.com> [ Rebase, add a Link: tag, add an simple cause analyze ] Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Qu Wenruo
|
1cb15b153c |
btrfs: lzo: add error message for invalid headers
Inside btrfs we always pair -EUCLEAN error with an error message to indicate which data is corrupted. However there are 3 cases inside lzo decompression where there is no error message for corrupted headers. Add those missing error messages to show exactly where the corruption is. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Boris Burkov
|
3dcd507308 |
btrfs: fallback to transaction csum tree on a commit root csum miss
We have been running with commit root csums enabled for some time and
have noticed a slight uptick in zero csum errors. Investigating those
revealed that they were same transaction reads of extents that were just
relocated, but the extent map generation was long ago.
It turns out that relocation intentionally does not update the extent
generation (replace_file_extents()), but must write a new csum since the
data has moved, so we must account for this with commit root csum reading.
Luckily this is a short lived condition: after the relocation transaction
the commit root will once again have the csum. So we can add a generic
fallback to the lookup to try again with the transaction csum root.
Fixes:
|
||
|
Filipe Manana
|
ce6050bafb |
btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()
If we have an unexpected reloc_root for our root, we jump to the out label
but never drop the reference we obtained for root, resulting in a leak.
Add a missing btrfs_put_root() call.
Fixes:
|
||
|
Xiang Mei
|
a2d8d5647e |
btrfs: reject free space cache with more entries than pages
When loading a v1 free space cache, __load_free_space_cache() takes
num_entries and num_bitmaps straight from the on-disk
btrfs_free_space_header. That header is stored in the tree_root under a key
with type 0, which the tree-checker has no case for, so neither count is
validated before the load trusts it.
The load loops num_entries times and maps the next page whenever the current
one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which
does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in
io_ctl_init() from the cache inode's i_size, not from num_entries:
num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);
So if num_entries claims more records than the pages can hold, io_ctl->index
runs off the end of pages[]. The write side never hits this because
io_ctl_add_entry() and io_ctl_add_bitmap() both stop once
io_ctl->index >= io_ctl->num_pages; the read side just never had the same
check.
To trigger it, take a clean cache (num_entries = <N> here), set num_entries
in the header to 0x10000, and fix up the leaf checksum so it still passes
the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and
pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read
65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the
array:
BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58
io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)
load_free_space_cache (fs/btrfs/free-space-cache.c:1017)
caching_thread (fs/btrfs/block-group.c:880)
btrfs_work_helper (fs/btrfs/async-thread.c:312)
process_one_work
worker_thread
kthread
ret_from_fork
free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()
at line 565, which is why that is the frame KASAN names. The out-of-bounds
slot is then treated as a struct page and handed to crc32c(), so the bad
read turns into a GP fault.
Add the missing check to io_ctl_check_crc(), which is where both the entry
loop and the bitmap loop end up. When num_entries is too large the load now
fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds
the free space from the extent tree, so a valid cache is never rejected.
Reported-by: Weiming Shi <bestswngs@gmail.com>
Fixes:
|
||
|
Filipe Manana
|
9d78a98796 |
btrfs: fix transaction abort logic in btrfs_fileattr_set()
There's no need to abort the transaction if we failed to set or delete a property, as we haven't done any change. However we need to abort if we set a property or delete a property and then fail to update the inode item, as that would leave the inode's state in subvolume tree inconsistent. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Filipe Manana
|
cf1afec09e |
btrfs: validate properties before setting them
We set the xattr and then attempt to apply the property. If the apply fails we then attempt to delete the xattr to avoid an inconsistency. However we don't verify if the deletion succeed, so if it fails we leave an inconsistency between the state in the btree and the in-memory inode. Address this by validating first if we can apply the property, then set the xattr, then apply the property, and this last step should not fail since the validation succeeded before - assert that it does not fail but leave code to attempt to delete the xattr if it happens, and then abort the transaction only if the xattr delete failed. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Linus Torvalds
|
2e05544060 |
mm.git review status for mm-hotfixes-stable..mm-nonmm-stable
Everything:
Total patches: 108
Reviews/patch: 0.84
Reviewed rate: 75%
Patch series in this merge:
- The 2 patch series "taskstats: fix TGID dead-thread stat retention"
from Yiyang Chen fixes a taskstats TGID aggregation bug where fields
added in the TGID query path were not preserved after thread exit, and
adds a kselftest covering the regression.
- The 2 patch series "lib/tests: string_helpers: Slight improvements"
from Andy Shevchenko improves lib/tests/string_helpers_kunit.c a little.
- The 2 patch series "lib/base64: decode fixes" from Josh Law addreesses
minor issues in lib/base64.c.
- The 3 patch series "selftests/filelock: Make output more kselftestish"
from Mark Brown makes the output from the ofdlocks test a bit easier for
tooling to work with, and also ignores the generated file.
- The 3 patch series "uaccess: unify inline vs outline
copy_{from,to}_user() selection" from Yury Norov simplifies the usercopy
code by removing the selectability of inlining copy_{from,to}_user().
- The 5 patch series "ocfs2: validate inline xattr header consumers"
from ZhengYuan Huang fixes a number of possible issues in the ocfs2
xattr code.
- The 8 patch series "lib and lib/cmdline enhancements" from Dmitry
Antipov provides additional robustness checking in the cmdline handling
code and its in-kernel testing and selftests.
- The 18 patch series "cleanup the RAID6 P/Q library" from Christoph
Hellwig cleans up the RAID6 P/Q library to match the recent updates to
the RAID 5 XOR library and other CRC/crypto libraries.
- The 3 patch series "ocfs2: harden inode validators against forged
metadata" from Michael Bommarito adds three structural checks to OCFS2
dinode validation so malformed on-disk fields are rejected before
ocfs2_populate_inode() copies them into the in-core inode.
- The 2 patch series "lib/raid: replace __get_free_pages() call with
kmalloc()" from Mike Rapoport cleans up the lib/raid code by using
kmalloc() in more places.
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Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "taskstats: fix TGID dead-thread stat retention" (Yiyang Chen)
Fix a taskstats TGID aggregation bug where fields added in the TGID
query path were not preserved after thread exit, and adds a kselftest
covering the regression.
- "lib/tests: string_helpers: Slight improvements" (Andy Shevchenko)
Improve lib/tests/string_helpers_kunit.c a little
- "lib/base64: decode fixes" (Josh Law)
Address minor issues in lib/base64.c
- "selftests/filelock: Make output more kselftestish" (Mark Brown)
Make the output from the ofdlocks test a bit easier for tooling to
work with. Also ignore the generated file
- "uaccess: unify inline vs outline copy_{from,to}_user() selection"
(Yury Norov)
Simplify the usercopy code by removing the selectability of inlining
copy_{from,to}_user().
- "ocfs2: validate inline xattr header consumers" (ZhengYuan Huang)
Fix a number of possible issues in the ocfs2 xattr code
- "lib and lib/cmdline enhancements" (Dmitry Antipov)
Provide additional robustness checking in the cmdline handling code
and its in-kernel testing and selftests
- "cleanup the RAID6 P/Q library" (Christoph Hellwig)
Clean up the RAID6 P/Q library to match the recent updates to the
RAID 5 XOR library and other CRC/crypto libraries
- "ocfs2: harden inode validators against forged metadata" (Michael
Bommarito)
Add three structural checks to OCFS2 dinode validation so malformed
on-disk fields are rejected before ocfs2_populate_inode() copies them
into the in-core inode
- "lib/raid: replace __get_free_pages() call with kmalloc()" (Mike
Rapoport)
Clean up the lib/raid code by using kmalloc() in more places
* tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (108 commits)
ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write
ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits
lib: interval_tree_test: validate benchmark parameters
ocfs2: avoid moving extents to occupied clusters
treewide: fix transposed "sign" typos and update spelling.txt
ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec
fat: reject BPB volumes whose data area starts beyond total sectors
selftests/uevent: increase __UEVENT_BUFFER_SIZE to avoid ENOBUFS on busy systems
lib/test_firmware: allocate the configured into_buf size
fs: efs: remove unneeded debug prints
checkpatch: cuppress warnings when Reported-by: is followed by Link:
MAINTAINERS: add Alexander as a kcov reviewer
mailmap: update Alexander Sverdlin's Email addresses
fs: fat: inode: replace sprintf() with scnprintf()
ocfs2: fix out-of-bounds write in ocfs2_remove_refcount_extent
ocfs2: fix race between ocfs2_control_install_private() and ocfs2_control_release()
ocfs2/dlm: require a ref for locking_state debugfs open
ocfs2: reject FITRIM ranges shorter than a cluster
ocfs2: validate fast symlink target during inode read
ocfs2: add journal NULL check in ocfs2_checkpoint_inode()
...
|
||
|
Linus Torvalds
|
d4d9d39f04 |
workqueue: Changes for v7.2
- Continued progress toward making alloc_workqueue() unbound by default:
more callers converted to WQ_PERCPU / system_percpu_wq / system_dfl_wq,
and new warnings for queues that use neither WQ_PERCPU nor WQ_UNBOUND
or the legacy system_wq / system_unbound_wq.
- Misc: drop the now-trivial apply_wqattrs_lock()/unlock() wrappers,
forbid the TEST_WORKQUEUE benchmark from being built-in, and fix a
spurious pointer level in the worker debug-dump path.
-----BEGIN PGP SIGNATURE-----
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Merge tag 'wq-for-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue updates from Tejun Heo:
- Continued progress toward making alloc_workqueue() unbound by
default: more callers converted to WQ_PERCPU / system_percpu_wq /
system_dfl_wq, and new warnings for queues that use neither WQ_PERCPU
nor WQ_UNBOUND or the legacy system_wq / system_unbound_wq.
- Misc: drop the now-trivial apply_wqattrs_lock()/unlock() wrappers,
forbid the TEST_WORKQUEUE benchmark from being built-in, and fix a
spurious pointer level in the worker debug-dump path.
* tag 'wq-for-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
drm/bridge: anx7625: Add WQ_PERCPU add to alloc_workqueue
wifi: ath6kl: fix invalid workqueue flags in ath6kl_usb_create()
btrfs: Drop WQ_PERCPU from ordered_flags in btrfs_init_workqueues()
workqueue: Add warnings and ensure one among WQ_PERCPU or WQ_UNBOUND is present
workqueue: Add warnings and fallback if system_{unbound}_wq is used
workqueue: drop spurious '*' from print_worker_info() fn declaration
workqueue: forbid TEST_WORKQUEUE from being built-in
workqueue: drop apply_wqattrs_lock()/unlock() wrappers
umh: replace use of system_unbound_wq with system_dfl_wq
rapidio: rio: add WQ_PERCPU to alloc_workqueue users
media: ddbridge: add WQ_PERCPU to alloc_workqueue users
platform: cznic: turris-omnia-mcu: replace use of system_wq with system_percpu_wq
media: synopsys: hdmirx: replace use of system_unbound_wq with system_dfl_wq
virt: acrn: Add WQ_PERCPU to alloc_workqueue users
|
||
|
Linus Torvalds
|
31b706da2c |
for-7.2-tag
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Merge tag 'for-7.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"The most noticeable change is to enable large folios by default, it's
been in testing for a few releases. Related to that is huge folio
support (still under experimental config). Otherwise a few ioctl
updates, performance improvements and usual fixes and core changes.
User visible changes:
- enable large folios by default, added in 6.17 (under experimental
build), no feature limitations, a big change internally
- new ioctl to return raw checksums to userspace (a bit tricky given
compression and tail extents), can be used for mkfs and
deduplication optimizations
- provide stable UUID for e.g. overlayfs and temp_fsid, also
reflected in statvfs() field f_fsid, internal dev_t is hashed in to
allow cloning
- add 32bit compat version of GET_SUBVOL_INFO ioctl
- in experimental build, support huge folios (up to 2M)
Performance related improvements/changes:
- limit bio size to the estimated optimum derived from the queue,
this prevents build up of too much data for writeback, which could
cause latency spikes (reported improvement 15% on sequential
writes)
- don't force direct IO to be serialized, forgotten change during
mount API port, brings back +60% of throughput
- lockless calculation of number of shrinkable extent maps, improve
performance with many memcg allocated objects
Notable fixes:
- in zoned mode, fix a deadlock due to zone reclaim and relocation
when space needs to be flushed
- don't trim device which is internally not tracked as writeable
(e.g. when missing device is being rescanned)
- fix deadlock when cloning inline extent and mounted with
flushoncommit
- fix false IO failures after direct IO falls back to buffered write
in some cases
Core:
- remove COW fixup mechanism completely; detect and fix changes to
pages outside of filesystem tracking, guaranteed since 5.8, grace
period is over
- remove 2K block size support, experimental to test subpage code on
x86_64 but now it would block folio changes
- tree-checker improvements of:
- free-space cache and tree items
- root reference and backref items
- extent state exceptions in reloc tree
- subpage mode updates:
- code optimizations, simplify tracking bitmaps
- re-enable readahead of compressed extent
- extend bitmap size to cover huge folios
- add tracepoints related to sync, tree-log and transactions
- device stats item tracking unification, remove item if there are no
stats recorded, also don't leave stale stats on replaced device
- allow extent buffer pages to be allocated as movable, to help page
migration
- added checks for proper extent buffer release
- btrfs.ko code size reduction due to transaction abort call
simplifications
- several struct size reductions
- more auto free conversions
- more verbose assertions"
* tag 'for-7.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (130 commits)
btrfs: fix use-after-free after relocation failure with concurrent COW
btrfs: move WARN_ON on unexpected error in __add_tree_block()
btrfs: move locking into btrfs_get_reloc_bg_bytenr()
btrfs: lzo: reject compressed segment that overflows the compressed input
btrfs: retry faulting in the pages after a zero sized short direct write
btrfs: fix incorrect buffered IO fallback for append direct writes
btrfs: fix false IO failure after falling back to buffered write
btrfs: use verbose assertions in backref.c
btrfs: print a message when a missing device re-appears
btrfs: do not trim a device which is not writeable
btrfs: return real error after lookup failure in btrfs_ioctl_default_subvol()
btrfs: use mapping shared locking for reading super block
btrfs: use lockless read in nr_cached_objects shrinker callback
btrfs: switch local indicator variables to bools
btrfs: send: pass bool for pending_move and refs_processed parameters
btrfs: use shifts for sectorsize and nodesize
btrfs: fix deadlock cloning inline extent when using flushoncommit
btrfs: allocate eb-attached btree pages as movable
btrfs: add 32-bit compat ioctl for BTRFS_IOC_GET_SUBVOL_INFO
btrfs: derive f_fsid from on-disk fsid and dev_t
...
|
||
|
Nathan Chancellor
|
c7703f05d8 |
btrfs: Drop WQ_PERCPU from ordered_flags in btrfs_init_workqueues()
After commit |
||
|
Linus Torvalds
|
0793d39ec8 |
vfs-7.2-rc1.super
Please consider pulling these changes from the signed vfs-7.2-rc1.super tag. Thanks! Christian -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCaiwLKgAKCRCRxhvAZXjc ogMFAP9PfdJW1ChpUaOPI7/Oa7Nm74czRh5RLvwduFe1mevPZQD/dWHFjyGL5dat DgS7N38nTwCyohnPx7sDoeRG2g0B4QM= =iM4N -----END PGP SIGNATURE----- Merge tag 'vfs-7.2-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs superblock updates from Christian Brauner: "This retires sget(). CIFS plus the two ext4 KUnit tests (extents-test, mballoc-test) were the last in-tree callers, and all three convert cleanly to sget_fc(). That lets sget() and its prototype come out, taking ~60 lines that only existed to be kept in lockstep with sget_fc() on every publish-path change" * tag 'vfs-7.2-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: fs: retire sget() smb: client: convert cifs_smb3_do_mount() to sget_fc() ext4: convert mballoc KUnit test to sget_fc() ext4: convert extents KUnit test to sget_fc() |
||
|
Linus Torvalds
|
fac863c887 |
vfs-7.2-rc1.inode
Please consider pulling these changes from the signed vfs-7.2-rc1.inode tag. Thanks! Christian -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCaiwLKQAKCRCRxhvAZXjc oprJAQDhPF8SZCgbPQ6TYVjOZtP2jWZEOrh0UVd0YjisDHqpkAD/ZVlRzvn9jKBT uuFnsOsOhJYfsQym5uXJhFWgR1kHsQs= =CTxV -----END PGP SIGNATURE----- Merge tag 'vfs-7.2-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs inode updates from Christian Brauner: "This extends the lockless ->i_count handling. iput() could already decrement any value greater than one locklessly but acquiring a reference always required taking inode->i_lock. Now acquiring a reference is lockless as long as the count was already at least 1, i.e., only the 0->1 and 1->0 transitions take the lock. This avoids the lock for the common cases of nfs calling into the inode hash and btrfs using igrab(). Cleanup-wise icount_read_once() is added to line up with inode_state_read_once() and the open-coded ->i_count loads across the tree are converted, and ihold() is relocated and tidied up. On top of that some stale lock ordering annotations are retired from the inode hash code: iunique() no longer takes the hash lock since the inode hash became RCU-searchable and s_inode_list_lock is no longer taken under the hash lock either" * tag 'vfs-7.2-rc1.inode' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: fs: retire stale lock ordering annotations from inode hash fs: allow lockless ->i_count bumps as long as it does not transition 0->1 fs: relocate and tidy up ihold() fs: add icount_read_once() and stop open-coding ->i_count loads |
||
|
Filipe Manana
|
ae2eb64bfd |
btrfs: fix use-after-free after relocation failure with concurrent COW
If we get a failure during relocation, before we update all the extent buffers that have file extent items pointing to extents from the block group being relocated, we can trigger a user-after-free on the reloc control structure (fs_info->reloc_control) if we have a concurrent task that is COWing a subvolume leaf. This happens like this: 1) Relocation of data block group X starts; 2) Relocation changes its state to UPDATE_DATA_PTRS; 3) A task doing a rename for example, COWs leaf A from a subvolume tree and ends up at btrfs_reloc_cow_block() and extracts fs_info->reloc_ctl into a local variable, which then passes to replace_file_extents(); 4) The relocation task gets an error and under the label 'out_put_bg' in btrfs_relocate_block_group() calls free_reloc_control(), which frees the reloc control structure that the rename task is using; 5) The rename task triggers a use-after-free on the reloc control structure that was just freed. Syzbot reported this recently, with the following stack trace: [ 88.389822][ T5325] BTRFS error (device loop0 state A): Transaction aborted (error -5) [ 88.389842][ T5325] BTRFS: error (device loop0 state A) in cleanup_transaction:2067: errno=-5 IO failure [ 88.389864][ T5325] BTRFS info (device loop0 state EA): forced readonly [ 88.392277][ T5324] BTRFS: error (device loop0 state EA) in btrfs_sync_log:3572: errno=-5 IO failure [ 88.396630][ T5325] BTRFS info (device loop0 state EA): balance: ended with status: -5 [ 88.400135][ T5346] ================================================================== [ 88.400148][ T5346] BUG: KASAN: slab-use-after-free in replace_file_extents+0x85f/0x1590 [ 88.400288][ T5346] Read of size 8 at addr ffff888012312010 by task syz.0.0/5346 [ 88.400299][ T5346] [ 88.400306][ T5346] CPU: 0 UID: 0 PID: 5346 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 88.400319][ T5346] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 88.400325][ T5346] Call Trace: [ 88.400331][ T5346] <TASK> [ 88.400336][ T5346] dump_stack_lvl+0xe8/0x150 [ 88.400351][ T5346] print_address_description+0x55/0x1e0 [ 88.400364][ T5346] ? replace_file_extents+0x85f/0x1590 [ 88.400378][ T5346] print_report+0x58/0x70 [ 88.400389][ T5346] kasan_report+0x117/0x150 [ 88.400405][ T5346] ? replace_file_extents+0x85f/0x1590 [ 88.400420][ T5346] replace_file_extents+0x85f/0x1590 [ 88.400440][ T5346] ? __pfx_replace_file_extents+0x10/0x10 [ 88.400452][ T5346] ? update_ref_for_cow+0xa71/0x1270 [ 88.400473][ T5346] btrfs_force_cow_block+0xa4d/0x2450 [ 88.400492][ T5346] ? __pfx_btrfs_force_cow_block+0x10/0x10 [ 88.400508][ T5346] ? __pfx_btrfs_get_32+0x10/0x10 [ 88.400523][ T5346] btrfs_cow_block+0x3c4/0xa90 [ 88.400542][ T5346] push_leaf_left+0x2ac/0x4a0 [ 88.400561][ T5346] split_leaf+0xd16/0x12e0 [ 88.400574][ T5346] ? btrfs_bin_search+0x924/0xc70 [ 88.400592][ T5346] ? __pfx_split_leaf+0x10/0x10 [ 88.400602][ T5346] ? leaf_space_used+0x177/0x1e0 [ 88.400618][ T5346] ? btrfs_leaf_free_space+0x14a/0x2f0 [ 88.400634][ T5346] btrfs_search_slot+0x2641/0x2d20 [ 88.400654][ T5346] ? __pfx_btrfs_search_slot+0x10/0x10 [ 88.400669][ T5346] ? rcu_is_watching+0x15/0xb0 [ 88.400681][ T5346] ? trace_kmem_cache_alloc+0x29/0xe0 [ 88.400694][ T5346] btrfs_insert_empty_items+0x9c/0x190 [ 88.400711][ T5346] btrfs_insert_inode_ref+0x229/0xcb0 [ 88.400724][ T5346] ? __pfx_btrfs_insert_inode_ref+0x10/0x10 [ 88.400736][ T5346] ? __pfx_btrfs_qgroup_convert_reserved_meta+0x10/0x10 [ 88.400751][ T5346] ? btrfs_record_root_in_trans+0x124/0x180 [ 88.400767][ T5346] ? start_transaction+0x8a0/0x1820 [ 88.400778][ T5346] ? btrfs_set_inode_index+0x5e/0x100 [ 88.400787][ T5346] btrfs_rename2+0x17bb/0x40d0 [ 88.400800][ T5346] ? check_noncircular+0xda/0x150 [ 88.400814][ T5346] ? add_lock_to_list+0xc7/0x100 [ 88.400828][ T5346] ? __pfx_btrfs_rename2+0x10/0x10 [ 88.400842][ T5346] ? lockdep_hardirqs_on+0x7a/0x110 [ 88.400901][ T5346] ? lock_acquire+0x221/0x350 [ 88.400915][ T5346] ? down_write_nested+0x174/0x210 [ 88.400931][ T5346] ? __pfx_down_write_nested+0x10/0x10 [ 88.400941][ T5346] ? do_raw_spin_unlock+0x4d/0x210 [ 88.400952][ T5346] ? try_break_deleg+0x5b/0x180 [ 88.400963][ T5346] ? __pfx_btrfs_rename2+0x10/0x10 [ 88.400973][ T5346] vfs_rename+0xa96/0xeb0 [ 88.400992][ T5346] ? __pfx_vfs_rename+0x10/0x10 [ 88.401010][ T5346] ovl_fill_super+0x46b7/0x5e20 [ 88.401030][ T5346] ? __pfx_ovl_fill_super+0x10/0x10 [ 88.401042][ T5346] ? xas_create+0x1902/0x1b90 [ 88.401060][ T5346] ? __pfx___mutex_trylock_common+0x10/0x10 [ 88.401076][ T5346] ? trace_contention_end+0x3d/0x140 [ 88.401094][ T5346] ? shrinker_register+0x124/0x230 [ 88.401111][ T5346] ? __mutex_unlock_slowpath+0x1be/0x6f0 [ 88.401127][ T5346] ? shrinker_register+0x61/0x230 [ 88.401143][ T5346] ? __pfx___mutex_lock+0x10/0x10 [ 88.401158][ T5346] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 88.401177][ T5346] ? __raw_spin_lock_init+0x45/0x100 [ 88.401196][ T5346] ? sget_fc+0x962/0xa40 [ 88.401208][ T5346] ? __pfx_set_anon_super_fc+0x10/0x10 [ 88.401222][ T5346] ? __pfx_ovl_fill_super+0x10/0x10 [ 88.401241][ T5346] get_tree_nodev+0xbb/0x150 [ 88.401257][ T5346] vfs_get_tree+0x92/0x2a0 [ 88.401272][ T5346] do_new_mount+0x341/0xd30 [ 88.401283][ T5346] ? apparmor_capable+0x126/0x170 [ 88.401301][ T5346] ? __pfx_do_new_mount+0x10/0x10 [ 88.401311][ T5346] ? ns_capable+0x89/0xe0 [ 88.401322][ T5346] ? path_mount+0x690/0x10e0 [ 88.401333][ T5346] ? user_path_at+0xd4/0x160 [ 88.401346][ T5346] __se_sys_mount+0x31d/0x420 [ 88.401358][ T5346] ? __pfx___se_sys_mount+0x10/0x10 [ 88.401370][ T5346] ? __x64_sys_mount+0x20/0xc0 [ 88.401381][ T5346] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.401391][ T5346] do_syscall_64+0x15f/0xf80 [ 88.401403][ T5346] ? trace_irq_disable+0x3b/0x140 [ 88.401413][ T5346] ? clear_bhb_loop+0x40/0x90 [ 88.401421][ T5346] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.401429][ T5346] RIP: 0033:0x7fa1ff79ce59 [ 88.401436][ T5346] Code: ff c3 66 (...) [ 88.401443][ T5346] RSP: 002b:00007fa2005affe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 88.401456][ T5346] RAX: ffffffffffffffda RBX: 00007fa1ffa16180 RCX: 00007fa1ff79ce59 [ 88.401464][ T5346] RDX: 0000200000000100 RSI: 0000200000002240 RDI: 0000000000000000 [ 88.401474][ T5346] RBP: 00007fa1ff832d6f R08: 0000200000000440 R09: 0000000000000000 [ 88.401481][ T5346] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 88.401488][ T5346] R13: 00007fa1ffa16218 R14: 00007fa1ffa16180 R15: 00007ffc734fba78 [ 88.401500][ T5346] </TASK> [ 88.401506][ T5346] [ 88.401510][ T5346] Allocated by task 5325: [ 88.401516][ T5346] kasan_save_track+0x3e/0x80 [ 88.401529][ T5346] __kasan_kmalloc+0x93/0xb0 [ 88.401542][ T5346] __kmalloc_cache_noprof+0x31c/0x660 [ 88.401554][ T5346] btrfs_relocate_block_group+0x217/0xc40 [ 88.401568][ T5346] btrfs_relocate_chunk+0x115/0x820 [ 88.401577][ T5346] __btrfs_balance+0x1db0/0x2ae0 [ 88.401587][ T5346] btrfs_balance+0xaf3/0x11b0 [ 88.401596][ T5346] btrfs_ioctl_balance+0x3d3/0x610 [ 88.401612][ T5346] __se_sys_ioctl+0xfc/0x170 [ 88.401626][ T5346] do_syscall_64+0x15f/0xf80 [ 88.401640][ T5346] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.401650][ T5346] [ 88.401653][ T5346] Freed by task 5325: [ 88.401659][ T5346] kasan_save_track+0x3e/0x80 [ 88.401671][ T5346] kasan_save_free_info+0x46/0x50 [ 88.401680][ T5346] __kasan_slab_free+0x5c/0x80 [ 88.401692][ T5346] kfree+0x1c5/0x640 [ 88.401703][ T5346] btrfs_relocate_block_group+0x95d/0xc40 [ 88.401715][ T5346] btrfs_relocate_chunk+0x115/0x820 [ 88.401724][ T5346] __btrfs_balance+0x1db0/0x2ae0 [ 88.401733][ T5346] btrfs_balance+0xaf3/0x11b0 [ 88.401742][ T5346] btrfs_ioctl_balance+0x3d3/0x610 [ 88.401757][ T5346] __se_sys_ioctl+0xfc/0x170 [ 88.401770][ T5346] do_syscall_64+0x15f/0xf80 [ 88.401785][ T5346] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.401795][ T5346] [ 88.401798][ T5346] The buggy address belongs to the object at ffff888012312000 [ 88.401798][ T5346] which belongs to the cache kmalloc-2k of size 2048 [ 88.401807][ T5346] The buggy address is located 16 bytes inside of [ 88.401807][ T5346] freed 2048-byte region [ffff888012312000, ffff888012312800) [ 88.401819][ T5346] [ 88.401822][ T5346] The buggy address belongs to the physical page: [ 88.401829][ T5346] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12310 [ 88.401840][ T5346] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 88.401849][ T5346] flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) [ 88.401860][ T5346] page_type: f5(slab) [ 88.401871][ T5346] raw: 00fff00000000040 ffff88801ac42000 dead000000000100 dead000000000122 [ 88.401881][ T5346] raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 [ 88.401892][ T5346] head: 00fff00000000040 ffff88801ac42000 dead000000000100 dead000000000122 [ 88.401902][ T5346] head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 [ 88.401913][ T5346] head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff [ 88.401923][ T5346] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 [ 88.401929][ T5346] page dumped because: kasan: bad access detected [ 88.401935][ T5346] page_owner tracks the page as allocated [ 88.401941][ T5346] page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9, tgid 9 (kworker/0:0), ts 83905464494, free_ts 83674944822 [ 88.401961][ T5346] post_alloc_hook+0x231/0x280 [ 88.401975][ T5346] get_page_from_freelist+0x24ba/0x2540 [ 88.401990][ T5346] __alloc_frozen_pages_noprof+0x18d/0x380 [ 88.402004][ T5346] allocate_slab+0x77/0x660 [ 88.402019][ T5346] refill_objects+0x339/0x3d0 [ 88.402033][ T5346] __pcs_replace_empty_main+0x321/0x720 [ 88.402043][ T5346] __kmalloc_node_track_caller_noprof+0x572/0x7b0 [ 88.402055][ T5346] __alloc_skb+0x2c1/0x7d0 [ 88.402067][ T5346] mld_newpack+0x14c/0xc90 [ 88.402080][ T5346] add_grhead+0x5a/0x2a0 [ 88.402093][ T5346] add_grec+0x1452/0x1740 [ 88.402105][ T5346] mld_ifc_work+0x6e6/0xe70 [ 88.402116][ T5346] process_scheduled_works+0xb5d/0x1860 [ 88.402127][ T5346] worker_thread+0xa53/0xfc0 [ 88.402138][ T5346] kthread+0x389/0x470 [ 88.402150][ T5346] ret_from_fork+0x514/0xb70 [ 88.402161][ T5346] page last free pid 5282 tgid 5282 stack trace: [ 88.402168][ T5346] __free_frozen_pages+0xbc7/0xd30 [ 88.402180][ T5346] __slab_free+0x274/0x2c0 [ 88.402191][ T5346] qlist_free_all+0x99/0x100 [ 88.402201][ T5346] kasan_quarantine_reduce+0x148/0x160 [ 88.402211][ T5346] __kasan_slab_alloc+0x22/0x80 [ 88.402221][ T5346] __kmalloc_cache_noprof+0x2ba/0x660 [ 88.402231][ T5346] kernfs_fop_open+0x3f0/0xda0 [ 88.402253][ T5346] do_dentry_open+0x785/0x14e0 [ 88.402262][ T5346] vfs_open+0x3b/0x340 [ 88.402270][ T5346] path_openat+0x2e08/0x3860 [ 88.402281][ T5346] do_file_open+0x23e/0x4a0 [ 88.402292][ T5346] do_sys_openat2+0x113/0x200 [ 88.402300][ T5346] __x64_sys_openat+0x138/0x170 [ 88.402309][ T5346] do_syscall_64+0x15f/0xf80 [ 88.402326][ T5346] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.402336][ T5346] [ 88.402339][ T5346] Memory state around the buggy address: [ 88.402345][ T5346] ffff888012311f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 88.402352][ T5346] ffff888012311f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 88.402359][ T5346] >ffff888012312000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.402365][ T5346] ^ [ 88.402370][ T5346] ffff888012312080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.402380][ T5346] ffff888012312100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.402385][ T5346] ================================================================== Fix this by: 1) Making the reloc control structure ref counted; 2) Make revery place that access fs_info->reloc_ctl outside the relocation code, which at the moment it's only replace_file_extents() and btrfs_init_reloc_root(), get a reference count on the structure. There's also btrfs_update_reloc_root() that is called outside the relocation code, but this case is safe because it's only called in the transaction commit path while under the fs_info->reloc_mutex protection, but nevertheless grab a reference to make the code more consistent and avoid false alerts from AI reviews; 3) Add a spinlock to protect fs_info->reloc_ctl, since we can not take the fs_info->reloc_mutex as that would cause a deadlock since that lock is taken in the transaction commit path. That spinlock is taken before setting fs_info->reloc_ctl to an allocated structure, setting it to NULL and reading fs_info->reloc_ctl; 4) Make sure the structure is freed only when its reference count drops to zero. Reported-by: syzbot+0eea49bba18051dea35e@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-btrfs/6a1df323.bb0696ed.125a22.000a.GAE@google.com/ Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Filipe Manana
|
50c134f2a9 |
btrfs: move WARN_ON on unexpected error in __add_tree_block()
There's no point in having the WARN_ON(1) inside the if statement for the unexpected error. Move it into the if statement's condition, which brings a couple benefits: 1) It marks the branch as unlikely, hinting the compiler to generate better code; 2) The WARN_ON() produces a stack trace after the dumped leaf and error message which can hide that more important information in case we get a truncated dmesg/syslog. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Filipe Manana
|
f51228e1ba |
btrfs: move locking into btrfs_get_reloc_bg_bytenr()
It does not make sense for the single caller to have the responsability to lock the relocation mutex before calling the function and then have the function to assert the lock is held. As this is a function in relocation.c, move the locking details into it. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Weiming Shi
|
b0d27d4379 |
btrfs: lzo: reject compressed segment that overflows the compressed input
lzo_decompress_bio() validates each on-disk segment length seg_len only
against the workspace cbuf size, not against the compressed input size
(compressed_len, the total folio bytes of the bio). A crafted extent can
carry a segment whose seg_len passes the cbuf check but runs past the end
of the bio, so copy_compressed_segment() walks off the last folio:
get_current_folio() then returns the NULL folio from bio_next_folio(), and
with CONFIG_BTRFS_ASSERT disabled (default) folio_size(NULL) faults.
BUG: KASAN: null-ptr-deref in lzo_decompress_bio (fs/btrfs/lzo.c:383)
Read of size 8 at addr 0000000000000000 by task kworker/u8:1/29
Workqueue: btrfs-endio simple_end_io_work
kasan_report (mm/kasan/report.c:590)
lzo_decompress_bio (fs/btrfs/lzo.c:383)
end_bbio_compressed_read (fs/btrfs/compression.c:1065)
btrfs_bio_end_io (fs/btrfs/bio.c:135)
btrfs_check_read_bio (fs/btrfs/bio.c:180 fs/btrfs/bio.c:285)
simple_end_io_work
process_one_work
worker_thread
Reject any segment whose payload would extend beyond compressed_len before
copying it, treating it as corruption like the other on-disk validation
failures in this function.
Reported-by: Xiang Mei <xmei5@asu.edu>
Fixes:
|
||
|
Qu Wenruo
|
acf9ed3a6c |
btrfs: retry faulting in the pages after a zero sized short direct write
Currently btrfs_direct_write() will not try to fault in the pages, but
directly fall back to buffered writes, if the first page of the buffer
can not be faulted in.
For example, during generic/362 with nodatasum mount option, there is a
write at file offset 0, length PAGE_SIZE, and the page is not faulted in.
Then we go the following callchain and directly fall back to buffered
IO:
btrfs_direct_write()
|- btrfs_dio_write()
|- __iomap_dio_rw()
| |- iomap_iter()
| | |- btrfs_dio_iomap_begin()
| | Now an ordered extent is allocated for the 4K write.
| |
| |- iomi.status = iomap_dio_iter()
| | Where iomap_dio_iter() returned -EFAULT.
| |
| |- ret = iomap_iter()
| | |- btrfs_dio_iomap_end()
| | | | return -ENOTBLK
| | |- return -ENOTBLK
| |- if (ret == -ENOTBLK) { ret = 0; }
| Now the return value is reset to 0.
|
|- ret = iomap_dio_complete()
| Since no byte is submitted, @ret is now zero.
|
|- if (iov_iter_count() > 0 && (ret == -EFAULT || ret > 0))
| @ret is zero, thus not meeting the above retry condition
|
|- Fallback to buffered
Just slightly loosen the condition to allow retry faulting in pages after
a zero sized short write.
Unlike the previous two bug fixes, this one is not really cause any real
bug, but only reducing the chance to do zero-copy direct IO.
Thus it doesn't really require stable-CC nor fixes-tag.
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
||
|
Qu Wenruo
|
ff66fe6662 |
btrfs: fix incorrect buffered IO fallback for append direct writes
[BUG]
With the previous bug of short direct writes fixed, test case
generic/362 (*) still fails with the following error with nodatasum
mount option:
generic/362 0s ... - output mismatch (see /home/adam/xfstests/results//generic/362.out.bad)
- output mismatch (see /home/adam/xfstests/results//generic/362.out.bad)
--- tests/generic/362.out 2024-08-24 15:31:37.200000000 +0930
+++ /home/adam/xfstests/results//generic/362.out.bad 2026-05-27 10:13:09.072485767 +0930
@@ -1,2 +1,3 @@
QA output created by 362
+Wrong file size after first write, got 8192 expected 4096
Silence is golden
...
*: If the test case has been executed before with default data checksum,
the failure will not reproduce. Need the following fix to make it
reliably reproducible:
https://lore.kernel.org/linux-btrfs/20260528111659.87113-1-wqu@suse.com/
[CAUSE]
Inside btrfs_dio_iomap_begin() for a direct write, we increase the isize
if it's beyond the current isize.
But if the direct io finished short, we do not revert the isize to the
previous value nor to the short write end.
Then if we need to fall back to buffered writes, and the write has
IOCB_APPEND flag, then the buffered write will be positioned at the
incorrect isize.
The call chain looks like this:
btrfs_direct_write(pos=0, length=4K)
|- __iomap_dio_rw()
| |- iomap_iter()
| | |- btrfs_dio_iomap_begin()
| | |- btrfs_get_blocks_direct_write()
| | |- i_size_write()
| | Which updates the isize to the write end (4K).
| |
| |- iomap_dio_iter()
| | Failed with -EFAULT on the first page.
| |
| |- iomap_iter()
| | |- btrfs_dio_iomap_end()
| | Detects a short write, return -ENOTBLK
| |- if (ret == -ENOTBLK) { ret = 0;}
| Which resets the return value.
|
|- ret = iomap_dio_complet()
| Which returns 0.
|
|- btrfs_buffered_write(iocb, from);
|- generic_write_checks()
|- iocb->ki_pos = i_size_read()
Which is still the new size (4K), other than the original
isize 0.
[FIX]
Introduce the following btrfs_dio_data members:
- old_isize
- updated_isize
If the direct write has enlarged the isize.
Then if we got a short write, and btrfs_dio_data::updated_isize is set,
revert to the correct isize based on old_isize and current file
position.
And here we call i_size_write() without holding an extent lock, which is
a very special case that we're safe to do:
- Only a single writer can be enlarging isize
Enlarging isize will take the exclusive inode lock.
- Buffered readers need to wait for the OE we're holding
Buffered readers will lock extent and wait for OE of the folio range.
Sometimes we can skip the OE wait, but since all page cache is
invalidated, the OE wait can not be skipped.
But I do not think this is the most elegant solution, nor covers all
cases. E.g. if the bio is submitted but IO failed, we are unable to do
the revert.
I believe the more elegant one would be extend the EXTENT_DIO_LOCKED
lifespan for direct writes, so that we can update the isize when a
write beyond EOF finished successfully.
However that change is too huge for a small bug fix.
So only implement the minimal partial fix for now.
[REASON FOR NO FIXES TAG]
The bug is again very old, before commit
|
||
|
Qu Wenruo
|
66ff4d366e |
btrfs: fix false IO failure after falling back to buffered write
[BUG]
The test case generic/362 will fail with "nodatasum" mount option (*):
MOUNT_OPTIONS -- -o nodatasum /dev/mapper/test-scratch1 /mnt/scratch
generic/362 0s ... - output mismatch (see /home/adam/xfstests/results//generic/362.out.bad)
--- tests/generic/362.out 2024-08-24 15:31:37.200000000 +0930
+++ /home/adam/xfstests/results//generic/362.out.bad 2026-05-27 10:21:17.574771567 +0930
@@ -1,2 +1,3 @@
QA output created by 362
+First write failed: Input/output error
Silence is golden
...
*: If the test case has been executed before with default data checksum,
the failure will not reproduce. Need the following fix to make it
reliably reproducible:
https://lore.kernel.org/linux-btrfs/20260528111659.87113-1-wqu@suse.com/
[CAUSE]
Inside __iomap_dio_rw(), the -EFAULT/-ENOTBLK error is not directly returned.
Thus we never got an error pointer from __iomap_dio_rw().
The call chain looks like this:
btrfs_direct_write()
|- btrfs_dio_write()
|- __iomap_dio_rw()
| |- iomap_iter()
| | |- btrfs_dio_iomap_begin()
| | Now an ordered extent is allocated for the 4K write.
| |
| |- iomi.status = iomap_dio_iter()
| | Where iomap_dio_iter() returned -EFAULT.
| |
| |- ret = iomap_iter()
| | |- btrfs_dio_iomap_end()
| | | |- btrfs_finish_ordered_extent(uptodate = false)
| | | | |- can_finish_ordered_extent()
| | | | |- btrfs_mark_ordered_extent_error()
| | | | |- mapping_set_error()
| | | | Now the address space is marked error.
| | | | return -ENOTBLK
| | |- return -ENOTBLK
| |- if (ret == -ENOTBLK) { ret = 0; }
| Now the return value is reset to 0.
| Thus no error pointer will be returned.
|
|- ret = iomap_dio_complete()
| Since no byte is submitted, @ret is 0.
|
|- Fallback to buffered IO
| And the buffered write finished without error
|
|- filemap_fdatawait_range()
|- filemap_check_errors()
The previous error is recorded, thus an error is returned
However the buffered write is properly submitted and finished, the error
is from the btrfs_finish_ordered_extent() call with @uptodate = false.
[FIX]
When a short dio write happened, any range that is submitted will have
btrfs_extract_ordered_extent() to be called, thus the submitted range
will always have an OE just covering the submitted range.
The remaining OE range is never submitted, thus they should be treated
as truncated, not an error. So that we can properly reclaim and not
insert an unnecessary file extent item, without marking the mapping as
error.
Extract a helper, btrfs_mark_ordered_extent_truncated(), and utilize
that helper to mark the direct IO ordered extent as truncated, so it
won't cause failure for the later buffered fallback.
[REASON FOR NO FIXES TAG]
The bug itself is pretty old, at commit
|
||
|
Filipe Manana
|
c4e7778580 |
btrfs: use verbose assertions in backref.c
While debugging a relocation issue I hit an assertion in backref.c but it was not super useful, since it could not tell what was the unexpected value that triggered the assertion. The stack trace was this: [583246.338097] assertion failed: !cache->nr_nodes, in fs/btrfs/backref.c:3158 [583246.339588] ------------[ cut here ]------------ [583246.340573] kernel BUG at fs/btrfs/backref.c:3158! [583246.342075] Oops: invalid opcode: 0000 [#1] SMP PTI [583246.343294] CPU: 5 UID: 0 PID: 677957 Comm: btrfs Not tainted 7.1.0-rc4-btrfs-next-234+ #1 PREEMPT(full) [583246.345715] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014 [583246.348694] RIP: 0010:btrfs_backref_release_cache.cold+0x61/0x84 [btrfs] [583246.350759] Code: 90 d5 7c (...) [583246.354923] RSP: 0018:ffffd4fc88c93ad8 EFLAGS: 00010246 [583246.355982] RAX: 000000000000003e RBX: ffff8dec90d97020 RCX: 0000000000000000 [583246.357459] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000ffffffff [583246.359517] RBP: ffff8dec8eeb78c0 R08: 0000000000000000 R09: 3fffffffffefffff [583246.361180] R10: ffffd4fc88c93970 R11: 0000000000000003 R12: ffff8decd21f3470 [583246.363184] R13: 00000000fffffffe R14: ffff8decd21f3000 R15: ffff8decd21f3000 [583246.364666] FS: 00007f9a51751400(0000) GS:ffff8df3f4255000(0000) knlGS:0000000000000000 [583246.366287] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [583246.367443] CR2: 00007f9a518ed8f5 CR3: 00000004467c8002 CR4: 0000000000370ef0 [583246.368969] Call Trace: [583246.369541] <TASK> [583246.370040] relocate_block_group+0xf2/0x520 [btrfs] [583246.371243] btrfs_relocate_block_group+0x9a9/0x22e0 [btrfs] [583246.372443] ? preempt_count_add+0x47/0xa0 [583247.532978] ? btrfs_tree_read_lock_nested+0x19/0x90 [btrfs] [583247.534520] ? mutex_lock+0x1a/0x40 [583247.602233] ? btrfs_scrub_pause+0x2e/0x120 [btrfs] [583247.603543] btrfs_relocate_chunk+0x3b/0x1a0 [btrfs] [583247.604893] btrfs_balance+0x9d5/0x1920 [btrfs] [583247.606189] ? preempt_count_add+0x69/0xa0 [583247.607030] btrfs_ioctl+0x260c/0x2a20 [btrfs] [583247.608015] ? __memcg_slab_free_hook+0x156/0x1a0 [583247.636971] __x64_sys_ioctl+0x92/0xe0 [583247.679247] do_syscall_64+0x60/0xf20 [583247.753297] ? clear_bhb_loop+0x60/0xb0 [583247.756321] entry_SYSCALL_64_after_hwframe+0x76/0x7e [583247.787018] RIP: 0033:0x7f9a5186a8db [583247.787787] Code: 00 48 89 (...) [583247.791410] RSP: 002b:00007fff2ffa6ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [583247.792897] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9a5186a8db [583247.794319] RDX: 00007fff2ffa6bb0 RSI: 00000000c4009420 RDI: 0000000000000003 [583247.795714] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [583247.797149] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2ffa903f [583247.798685] R13: 00007fff2ffa6bb0 R14: 0000000000000002 R15: 0000000000000002 [583247.800136] </TASK> So update all simple assertions in backref.c to print out the values when they aren't testing simple boolean conditions. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Qu Wenruo
|
7af30ba6eb |
btrfs: print a message when a missing device re-appears
There is a bug report that fstrim crashed, and that crash is eventually pinned down to a missing device which re-appeared and screwed up callers that only checks BTRFS_DEV_STATE_MISSING, but not BTRFS_DEV_STATE_WRITEABLE nor device->bdev. A missing device re-appearing can be very tricky, as for now it will result in a device without WRITEABLE or MISSING flag, and still no bdev pointer. As the first step to enhance handling of such re-appearing missing devices, add a dmesg output when a missing device re-appeared. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |