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When a bio is split in btrfs_submit_direct, dip->file_offset contains
the file offset for the first bio. But this means the start value used
in btrfs_end_dio_bio to record the write location for zone devices is
incorrect for subsequent bios.
CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Naohiro Aota <[email protected]>
Reviewed-by: Qu Wenruo <[email protected]>
Reviewed-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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When a bio is split in btrfs_submit_direct, dip->file_offset contains
the file offset for the first bio. But this means the start value used
in btrfs_check_read_dio_bio is incorrect for subsequent bios. Add
a file_offset field to struct btrfs_bio to pass along the correct offset.
Given that check_data_csum only uses start of an error message this
means problems with this miscalculation will only show up when I/O fails
or checksums mismatch.
The logic was removed in f4f39fc5dc30 ("btrfs: remove btrfs_bio::logical
member") but we need it due to the bio splitting.
CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Naohiro Aota <[email protected]>
Reviewed-by: Qu Wenruo <[email protected]>
Reviewed-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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Zone Append bios only need a valid block device in struct bio, but
not the device in the btrfs_bio. Use the information from
btrfs_zoned_get_device to set up bi_bdev and fix zoned writes on
multi-device file system with non-homogeneous capabilities and remove
the pointless btrfs_bio.device assignment.
Add big fat comments explaining what is going on here.
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Naohiro Aota <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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On a zoned filesystem, if we fail to allocate the root node for the log
root tree while syncing the log, we end up returning without finishing
the IO plug we started before, resulting in leaking resources as we
have started writeback for extent buffers of a log tree before. That
allocation failure, which typically is either -ENOMEM or -ENOSPC, is not
fatal and the fsync can safely fallback to a full transaction commit.
So release the IO plug if we fail to allocate the extent buffer for the
root of the log root tree when syncing the log on a zoned filesystem.
Fixes: 3ddebf27fcd3a9 ("btrfs: zoned: reorder log node allocation on zoned filesystem")
CC: [email protected] # 5.15+
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Filipe Manana <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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This restores the logic from commit 46bcff2bfc5e ("btrfs: fix compressed
write bio blkcg attribution") which added cgroup attribution to btrfs
writeback. It also adds back the REQ_CGROUP_PUNT flag for these ios.
Fixes: 91507240482e ("btrfs: determine stripe boundary at bio allocation time in btrfs_submit_compressed_write")
CC: [email protected] # 5.16+
Signed-off-by: Dennis Zhou <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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In btrfs_get_root_ref(), when btrfs_insert_fs_root() fails,
btrfs_put_root() can happen for two reasons:
- the root already exists in the tree, in that case it returns the
reference obtained in btrfs_lookup_fs_root()
- another error so the cleanup is done in the fail label
Calling btrfs_put_root() unconditionally would lead to double decrement
of the root reference possibly freeing it in the second case.
Reported-by: TOTE Robot <[email protected]>
Fixes: bc44d7c4b2b1 ("btrfs: push btrfs_grab_fs_root into btrfs_get_fs_root")
CC: [email protected] # 5.10+
Signed-off-by: Jia-Ju Bai <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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In btrfs_make_block_group(), we activate the allocated block group,
expecting that the block group is soon used for allocation. However, the
chunk allocation from flush_space() context broke the assumption. There
can be a large time gap between the chunk allocation time and the extent
allocation time from the chunk.
Activating the empty block groups pre-allocated from flush_space()
context can exhaust the active zone counter of a device. Once we use all
the active zone counts for empty pre-allocated block groups, we cannot
activate new block group for the other things: metadata, tree-log, or
data relocation block group. That failure results in a fake -ENOSPC.
This patch introduces CHUNK_ALLOC_FORCE_FOR_EXTENT to distinguish the
chunk allocation from find_free_extent(). Now, the new block group is
activated only in that context.
Fixes: eb66a010d518 ("btrfs: zoned: activate new block group")
CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Tested-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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Return the allocated block group from do_chunk_alloc(). This is a
preparation patch for the next patch.
CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Tested-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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When btrfs balance is interrupted with umount, the background balance
resumes on the next mount. There is a potential deadlock with FS freezing
here like as described in commit 26559780b953 ("btrfs: zoned: mark
relocation as writing"). Mark the process as sb_writing to avoid it.
Reviewed-by: Filipe Manana <[email protected]>
CC: [email protected] # 4.9+
Signed-off-by: Naohiro Aota <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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It was scheduled for removal in kernel v5.18 commit 6c405b24097c
("btrfs: deprecate BTRFS_IOC_BALANCE ioctl") thus its time has come.
Reviewed-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Nikolay Borisov <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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Running generic/406 causes the following WARNING in btrfs_destroy_inode()
which tells there are outstanding extents left.
In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding
extents with btrfs_delalloc_reserve_metadata() (or indirectly from
btrfs_delalloc_reserve_space(()). We then release the outstanding extents
with btrfs_delalloc_release_extents(). However, the "len" can be modified
in the COW case, which releases fewer outstanding extents than expected.
Fix it by calling btrfs_delalloc_release_extents() for the original length.
To reproduce the warning, the filesystem should be 1 GiB. It's
triggering a short-write, due to not being able to allocate a large
extent and instead allocating a smaller one.
WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs]
Modules linked in: btrfs blake2b_generic xor lzo_compress
lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram
zsmalloc
CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014
RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs]
RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000
RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78
RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8
R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800
R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68
FS: 00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
destroy_inode+0x33/0x70
dispose_list+0x43/0x60
evict_inodes+0x161/0x1b0
generic_shutdown_super+0x2d/0x110
kill_anon_super+0xf/0x20
btrfs_kill_super+0xd/0x20 [btrfs]
deactivate_locked_super+0x27/0x90
cleanup_mnt+0x12c/0x180
task_work_run+0x54/0x80
exit_to_user_mode_prepare+0x152/0x160
syscall_exit_to_user_mode+0x12/0x30
do_syscall_64+0x42/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f854a000fb7
Fixes: f0bfa76a11e9 ("btrfs: fix ENOSPC failure when attempting direct IO write into NOCOW range")
CC: [email protected] # 5.17
Reviewed-by: Johannes Thumshirn <[email protected]>
Tested-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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Clang's version of -Wunused-but-set-variable recently gained support for
unary operations, which reveals two unused variables:
fs/btrfs/block-group.c:2949:6: error: variable 'num_started' set but not used [-Werror,-Wunused-but-set-variable]
int num_started = 0;
^
fs/btrfs/block-group.c:3116:6: error: variable 'num_started' set but not used [-Werror,-Wunused-but-set-variable]
int num_started = 0;
^
2 errors generated.
These variables appear to be unused from their introduction, so just
remove them to silence the warnings.
Fixes: c9dc4c657850 ("Btrfs: two stage dirty block group writeout")
Fixes: 1bbc621ef284 ("Btrfs: allow block group cache writeout outside critical section in commit")
CC: [email protected] # 5.4+
Link: https://github.com/ClangBuiltLinux/linux/issues/1614
Signed-off-by: Nathan Chancellor <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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The logic !A || A && B is equivalent to !A || B. so we can
make code clear.
Note: though it's preferred to be in the more human readable form, there
have been repeated reports and patches as the expression is detected by
tools so apply it to reduce the load.
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Haowen Bai <[email protected]>
Reviewed-by: David Sterba <[email protected]>
[ add note ]
Signed-off-by: David Sterba <[email protected]>
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A subvolume with an active swapfile must not be deleted otherwise it
would not be possible to deactivate it.
After the subvolume is deleted, we cannot swapoff the swapfile in this
deleted subvolume because the path is unreachable. The swapfile is
still active and holding references, the filesystem cannot be unmounted.
The test looks like this:
mkfs.btrfs -f $dev > /dev/null
mount $dev $mnt
btrfs sub create $mnt/subvol
touch $mnt/subvol/swapfile
chmod 600 $mnt/subvol/swapfile
chattr +C $mnt/subvol/swapfile
dd if=/dev/zero of=$mnt/subvol/swapfile bs=1K count=4096
mkswap $mnt/subvol/swapfile
swapon $mnt/subvol/swapfile
btrfs sub delete $mnt/subvol
swapoff $mnt/subvol/swapfile # failed: No such file or directory
swapoff --all
unmount $mnt # target is busy.
To prevent above issue, we simply check that whether the subvolume
contains any active swapfile, and stop the deleting process. This
behavior is like snapshot ioctl dealing with a swapfile.
CC: [email protected] # 5.4+
Reviewed-by: Robbie Ko <[email protected]>
Reviewed-by: Qu Wenruo <[email protected]>
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Kaiwen Hu <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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This is a long time leftover from when I originally added the free space
inode, the point was to catch cases where we weren't honoring the NOCOW
flag. However there exists a race with relocation, if we allocate our
free space inode in a block group that is about to be relocated, we
could trigger the COW path before the relocation has the opportunity to
find the extents and delete the free space cache. In production where
we have auto-relocation enabled we're seeing this WARN_ON_ONCE() around
5k times in a 2 week period, so not super common but enough that it's at
the top of our metrics.
We're properly handling the error here, and with us phasing out v1 space
cache anyway just drop the WARN_ON_ONCE.
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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[BUG]
There is a report that autodefrag is defragging single sector, which
is completely waste of IO, and no help for defragging:
btrfs-cleaner-808 defrag_one_locked_range: root=256 ino=651122 start=0 len=4096
[CAUSE]
In defrag_collect_targets(), we check if the current range (A) can be merged
with next one (B).
If mergeable, we will add range A into target for defrag.
However there is a catch for autodefrag, when checking mergeability
against range B, we intentionally pass 0 as @newer_than, hoping to get a
higher chance to merge with the next extent.
But in the next iteration, range B will looked up by defrag_lookup_extent(),
with non-zero @newer_than.
And if range B is not really newer, it will rejected directly, causing
only range A being defragged, while we expect to defrag both range A and
B.
[FIX]
Since the root cause is the difference in check condition of
defrag_check_next_extent() and defrag_collect_targets(), we fix it by:
1. Pass @newer_than to defrag_check_next_extent()
2. Pass @extent_thresh to defrag_check_next_extent()
This makes the check between defrag_collect_targets() and
defrag_check_next_extent() more consistent.
While there is still some minor difference, the remaining checks are
focus on runtime flags like writeback/delalloc, which are mostly
transient and safe to be checked only in defrag_collect_targets().
Link: https://github.com/btrfs/linux/issues/423#issuecomment-1066981856
CC: [email protected] # 5.16+
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Qu Wenruo <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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Since the initial introduction of (posix) fallocate back at the turn of
the century, it has been possible to use this syscall to change the
user-visible contents of files. This can happen by extending the file
size during a preallocation, or through any of the newer modes (punch,
zero range). Because the call can be used to change file contents, we
should treat it like we do any other modification to a file -- update
the mtime, and drop set[ug]id privileges/capabilities.
The VFS function file_modified() does all this for us if pass it a
locked inode, so let's make fallocate drop permissions correctly.
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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[BUG]
There is a report that a btrfs has a bad super block num devices.
This makes btrfs to reject the fs completely.
BTRFS error (device sdd3): super_num_devices 3 mismatch with num_devices 2 found here
BTRFS error (device sdd3): failed to read chunk tree: -22
BTRFS error (device sdd3): open_ctree failed
[CAUSE]
During btrfs device removal, chunk tree and super block num devs are
updated in two different transactions:
btrfs_rm_device()
|- btrfs_rm_dev_item(device)
| |- trans = btrfs_start_transaction()
| | Now we got transaction X
| |
| |- btrfs_del_item()
| | Now device item is removed from chunk tree
| |
| |- btrfs_commit_transaction()
| Transaction X got committed, super num devs untouched,
| but device item removed from chunk tree.
| (AKA, super num devs is already incorrect)
|
|- cur_devices->num_devices--;
|- cur_devices->total_devices--;
|- btrfs_set_super_num_devices()
All those operations are not in transaction X, thus it will
only be written back to disk in next transaction.
So after the transaction X in btrfs_rm_dev_item() committed, but before
transaction X+1 (which can be minutes away), a power loss happen, then
we got the super num mismatch.
[FIX]
Instead of starting and committing a transaction inside
btrfs_rm_dev_item(), start a transaction in side btrfs_rm_device() and
pass it to btrfs_rm_dev_item().
And only commit the transaction after everything is done.
Reported-by: Luca Béla Palkovics <[email protected]>
Link: https://lore.kernel.org/linux-btrfs/CA+8xDSpvdm_U0QLBAnrH=zqDq_cWCOH5TiV46CKmp3igr44okQ@mail.gmail.com/
CC: [email protected] # 4.14+
Reviewed-by: Anand Jain <[email protected]>
Signed-off-by: Qu Wenruo <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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We use extent_changeset->bytes_changed in qgroup_reserve_data() to record
how many bytes we set for EXTENT_QGROUP_RESERVED state. Currently the
bytes_changed is set as "unsigned int", and it will overflow if we try to
fallocate a range larger than 4GiB. The result is we reserve less bytes
and eventually break the qgroup limit.
Unlike regular buffered/direct write, which we use one changeset for
each ordered extent, which can never be larger than 256M. For
fallocate, we use one changeset for the whole range, thus it no longer
respects the 256M per extent limit, and caused the problem.
The following example test script reproduces the problem:
$ cat qgroup-overflow.sh
#!/bin/bash
DEV=/dev/sdj
MNT=/mnt/sdj
mkfs.btrfs -f $DEV
mount $DEV $MNT
# Set qgroup limit to 2GiB.
btrfs quota enable $MNT
btrfs qgroup limit 2G $MNT
# Try to fallocate a 3GiB file. This should fail.
echo
echo "Try to fallocate a 3GiB file..."
fallocate -l 3G $MNT/3G.file
# Try to fallocate a 5GiB file.
echo
echo "Try to fallocate a 5GiB file..."
fallocate -l 5G $MNT/5G.file
# See we break the qgroup limit.
echo
sync
btrfs qgroup show -r $MNT
umount $MNT
When running the test:
$ ./qgroup-overflow.sh
(...)
Try to fallocate a 3GiB file...
fallocate: fallocate failed: Disk quota exceeded
Try to fallocate a 5GiB file...
qgroupid rfer excl max_rfer
-------- ---- ---- --------
0/5 5.00GiB 5.00GiB 2.00GiB
Since we have no control of how bytes_changed is used, it's better to
set it to u64.
CC: [email protected] # 4.14+
Reviewed-by: Qu Wenruo <[email protected]>
Signed-off-by: Ethan Lien <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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With commit dcf5652291f6 ("btrfs: zoned: allow DUP on meta-data block
groups") we started allowing DUP on metadata block groups, so the
ASSERT()s in btrfs_can_activate_zone() and btrfs_zoned_get_device() are
no longer valid and in fact even harmful.
Fixes: dcf5652291f6 ("btrfs: zoned: allow DUP on meta-data block groups")
CC: [email protected] # 5.17
Signed-off-by: Johannes Thumshirn <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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btrfs_can_activate_zone() can be called with the device_list_mutex already
held, which will lead to a deadlock:
insert_dev_extents() // Takes device_list_mutex
`-> insert_dev_extent()
`-> btrfs_insert_empty_item()
`-> btrfs_insert_empty_items()
`-> btrfs_search_slot()
`-> btrfs_cow_block()
`-> __btrfs_cow_block()
`-> btrfs_alloc_tree_block()
`-> btrfs_reserve_extent()
`-> find_free_extent()
`-> find_free_extent_update_loop()
`-> can_allocate_chunk()
`-> btrfs_can_activate_zone() // Takes device_list_mutex again
Instead of using the RCU on fs_devices->device_list we
can use fs_devices->alloc_list, protected by the chunk_mutex to traverse
the list of active devices.
We are in the chunk allocation thread. The newer chunk allocation
happens from the devices in the fs_device->alloc_list protected by the
chunk_mutex.
btrfs_create_chunk()
lockdep_assert_held(&info->chunk_mutex);
gather_device_info
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list)
Also, a device that reappears after the mount won't join the alloc_list
yet and, it will be in the dev_list, which we don't want to consider in
the context of the chunk alloc.
[15.166572] WARNING: possible recursive locking detected
[15.167117] 5.17.0-rc6-dennis #79 Not tainted
[15.167487] --------------------------------------------
[15.167733] kworker/u8:3/146 is trying to acquire lock:
[15.167733] ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: find_free_extent+0x15a/0x14f0 [btrfs]
[15.167733]
[15.167733] but task is already holding lock:
[15.167733] ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_create_pending_block_groups+0x20a/0x560 [btrfs]
[15.167733]
[15.167733] other info that might help us debug this:
[15.167733] Possible unsafe locking scenario:
[15.167733]
[15.171834] CPU0
[15.171834] ----
[15.171834] lock(&fs_devs->device_list_mutex);
[15.171834] lock(&fs_devs->device_list_mutex);
[15.171834]
[15.171834] *** DEADLOCK ***
[15.171834]
[15.171834] May be due to missing lock nesting notation
[15.171834]
[15.171834] 5 locks held by kworker/u8:3/146:
[15.171834] #0: ffff888100050938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1c3/0x5a0
[15.171834] #1: ffffc9000067be80 ((work_completion)(&fs_info->async_data_reclaim_work)){+.+.}-{0:0}, at: process_one_work+0x1c3/0x5a0
[15.176244] #2: ffff88810521e620 (sb_internal){.+.+}-{0:0}, at: flush_space+0x335/0x600 [btrfs]
[15.176244] #3: ffff888102962ee0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_create_pending_block_groups+0x20a/0x560 [btrfs]
[15.176244] #4: ffff8881152e4b78 (btrfs-dev-00){++++}-{3:3}, at: __btrfs_tree_lock+0x27/0x130 [btrfs]
[15.179641]
[15.179641] stack backtrace:
[15.179641] CPU: 1 PID: 146 Comm: kworker/u8:3 Not tainted 5.17.0-rc6-dennis #79
[15.179641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1.fc35 04/01/2014
[15.179641] Workqueue: events_unbound btrfs_async_reclaim_data_space [btrfs]
[15.179641] Call Trace:
[15.179641] <TASK>
[15.179641] dump_stack_lvl+0x45/0x59
[15.179641] __lock_acquire.cold+0x217/0x2b2
[15.179641] lock_acquire+0xbf/0x2b0
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] __mutex_lock+0x8e/0x970
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? lock_is_held_type+0xd7/0x130
[15.183838] ? find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] find_free_extent+0x15a/0x14f0 [btrfs]
[15.183838] ? _raw_spin_unlock+0x24/0x40
[15.183838] ? btrfs_get_alloc_profile+0x106/0x230 [btrfs]
[15.187601] btrfs_reserve_extent+0x131/0x260 [btrfs]
[15.187601] btrfs_alloc_tree_block+0xb5/0x3b0 [btrfs]
[15.187601] __btrfs_cow_block+0x138/0x600 [btrfs]
[15.187601] btrfs_cow_block+0x10f/0x230 [btrfs]
[15.187601] btrfs_search_slot+0x55f/0xbc0 [btrfs]
[15.187601] ? lock_is_held_type+0xd7/0x130
[15.187601] btrfs_insert_empty_items+0x2d/0x60 [btrfs]
[15.187601] btrfs_create_pending_block_groups+0x2b3/0x560 [btrfs]
[15.187601] __btrfs_end_transaction+0x36/0x2a0 [btrfs]
[15.192037] flush_space+0x374/0x600 [btrfs]
[15.192037] ? find_held_lock+0x2b/0x80
[15.192037] ? btrfs_async_reclaim_data_space+0x49/0x180 [btrfs]
[15.192037] ? lock_release+0x131/0x2b0
[15.192037] btrfs_async_reclaim_data_space+0x70/0x180 [btrfs]
[15.192037] process_one_work+0x24c/0x5a0
[15.192037] worker_thread+0x4a/0x3d0
Fixes: a85f05e59bc1 ("btrfs: zoned: avoid chunk allocation if active block group has enough space")
CC: [email protected] # 5.16+
Reviewed-by: Anand Jain <[email protected]>
Signed-off-by: Johannes Thumshirn <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
It's counter-intuitive (and wrong) to put the block group _before_ the
final usage in submit_eb_page. Fix it by re-ordering the call to
btrfs_put_block_group after its final reference. Also fix a minor typo
in 'implies'
Fixes: be1a1d7a5d24 ("btrfs: zoned: finish fully written block group")
CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Nikolay Borisov <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Syzbot reported a possible use-after-free in printing information
in device_list_add.
Very similar with the bug fixed by commit 0697d9a61099 ("btrfs: don't
access possibly stale fs_info data for printing duplicate device"),
but this time the use occurs in btrfs_info_in_rcu.
Call Trace:
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
btrfs_printk+0x395/0x425 fs/btrfs/super.c:244
device_list_add.cold+0xd7/0x2ed fs/btrfs/volumes.c:957
btrfs_scan_one_device+0x4c7/0x5c0 fs/btrfs/volumes.c:1387
btrfs_control_ioctl+0x12a/0x2d0 fs/btrfs/super.c:2409
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Fix this by modifying device->fs_info to NULL too.
Reported-and-tested-by: [email protected]
CC: [email protected] # 4.19+
Signed-off-by: Dongliang Mu <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
In a previous patch ("btrfs: extend locking to all space_info members
accesses") the locking for the space_info members was extended in
btrfs_preempt_reclaim_metadata_space because not all the member
accesses that needed locks were actually locked (bytes_pinned et al).
It was then suggested to also add a call to lockdep_assert_held to
need_preemptive_reclaim. This function also works with space_info
members. As of now, it has only two call sites which both hold the lock.
Suggested-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Niels Dossche <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
[BUG]
There is a bug report that a bitflip in the transid part of an extent
buffer makes btrfs to reject certain tree blocks:
BTRFS error (device dm-0): parent transid verify failed on 1382301696 wanted 262166 found 22
[CAUSE]
Note the failed transid check, hex(262166) = 0x40016, while
hex(22) = 0x16.
It's an obvious bitflip.
Furthermore, the reporter also confirmed the bitflip is from the
hardware, so it's a real hardware caused bitflip, and such problem can
not be detected by the existing tree-checker framework.
As tree-checker can only verify the content inside one tree block, while
generation of a tree block can only be verified against its parent.
So such problem remain undetected.
[FIX]
Although tree-checker can not verify it at write-time, we still have a
quick (but not the most accurate) way to catch such obvious corruption.
Function csum_one_extent_buffer() is called before we submit metadata
write.
Thus it means, all the extent buffer passed in should be dirty tree
blocks, and should be newer than last committed transaction.
Using that we can catch the above bitflip.
Although it's not a perfect solution, as if the corrupted generation is
higher than the correct value, we have no way to catch it at all.
Reported-by: Christoph Anton Mitterer <[email protected]>
Link: https://lore.kernel.org/linux-btrfs/[email protected]/
CC: [email protected] # 5.15+
Signed-off-by: Qu Wenruo <wqu@sus,ree.com>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
There is one oddball error handling of btrfs_read_buffer():
ret = btrfs_read_buffer(tmp, gen, parent_level - 1, &first_key);
if (!ret) {
*eb_ret = tmp;
return 0;
}
free_extent_buffer(tmp);
btrfs_release_path(p);
return -EIO;
While all other call sites check the error first. Unify the behavior.
Signed-off-by: Qu Wenruo <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
We had an error handling pattern for read_tree_block() like this:
eb = read_tree_block();
if (IS_ERR(eb)) {
/*
* Handling error here
* Normally ended up with return or goto out.
*/
} else if (!extent_buffer_uptodate(eb)) {
/*
* Different error handling here
* Normally also ended up with return or goto out;
*/
}
This is fine, but if we want to add extra check for each
read_tree_block(), the existing if-else-if is not that expandable and
will take reader some seconds to figure out there is no extra branch.
Here we change it to a more common way, without the extra else:
eb = read_tree_block();
if (IS_ERR(eb)) {
/*
* Handling error here
*/
return eb or goto out;
}
if (!extent_buffer_uptodate(eb)) {
/*
* Different error handling here
*/
return eb or goto out;
}
This also removes some oddball call sites which uses some creative way
to check error.
Signed-off-by: Qu Wenruo <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
__btrfs_free_extent() does all of the hard work of updating the extent
ref items, and then at the end if we dropped the extent completely it
does the cleanup accounting work. We're going to only want to do that
work for metadata with extent tree v2, so extract this bit into its own
helper.
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
This is a remnant of the work I did for qgroups a long time ago to only
run for a block when we had dropped the last ref. We haven't done that
for years, but the code remains. Drop this remnant.
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
We duplicate this logic for both data and metadata, at this point we've
already done our type specific extent root operations, this is just
doing the accounting and removing the space from the free space tree.
Extract this common logic out into a helper.
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Switch this to an ASSERT() and return the error in the normal case.
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
During log replay there is this pattern of running delayed items after
every inode unlink. To avoid repeating this several times, move the
logic into an helper function and use it instead of calling
btrfs_unlink_inode() followed by btrfs_run_delayed_items().
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
bytes_pinned is always accessed under space_info->lock, except in
btrfs_preempt_reclaim_metadata_space, however the other members are
accessed under that lock. The reserved member of the rsv's are also
partially accessed under a lock and partially not. Move all these
accesses into the same lock to ensure consistency.
This could potentially race and lead to a flush instead of a commit but
it's not a big problem as it's only for preemptive flush.
CC: [email protected] # 5.15+
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Niels Dossche <[email protected]>
Signed-off-by: Niels Dossche <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
There is a hung_task issue with running generic/068 on an SMR
device. The hang occurs while a process is trying to thaw the
filesystem. The process is trying to take sb->s_umount to thaw the
FS. The lock is held by fsstress, which calls btrfs_sync_fs() and is
waiting for an ordered extent to finish. However, as the FS is frozen,
the ordered extents never finish.
Having an ordered extent while the FS is frozen is the root cause of
the hang. The ordered extent is initiated from btrfs_relocate_chunk()
which is called from btrfs_reclaim_bgs_work().
This commit adds sb_*_write() around btrfs_relocate_chunk() call
site. For the usual "btrfs balance" command, we already call it with
mnt_want_file() in btrfs_ioctl_balance().
Fixes: 18bb8bbf13c1 ("btrfs: zoned: automatically reclaim zones")
CC: [email protected] # 5.13+
Link: https://github.com/naota/linux/issues/56
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Naohiro Aota <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Currently we disallow reflink and dedupe if the two files aren't on the
same vfsmount. However we really only need to disallow it if they're
not on the same super block. It is very common for btrfs to have a main
subvolume that is mounted and then different subvolumes mounted at
different locations. It's allowed to reflink between these volumes, but
the vfsmount check disallows this. Instead fix dedupe to check for the
same superblock, and simply remove the vfsmount check for reflink as it
already does the superblock check.
Reviewed-by: Darrick J. Wong <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
The sb check is already done in do_clone_file_range, and the mnt check
(which will hopefully go away in a subsequent patch) is done in
ioctl_file_clone(). Remove the check in our code and put an ASSERT() to
make sure it doesn't change underneath us.
Reviewed-by: Nikolay Borisov <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
We don't need a root here, we just need the btrfs_fs_info, we can just
get the specific roots we need from fs_info.
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
We're passing a root around here, but we only really need the fs_info,
so fix up btrfs_clean_one_deleted_snapshot() to take an fs_info instead,
and then fix up all the callers appropriately.
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
When a filesystem goes read-only due to an error, multiple errors tend
to be reported, some of which are knock-on failures. Logging fs_states,
in btrfs_handle_fs_error() and btrfs_printk() helps distinguish the
first error from subsequent messages which may only exist due to an
error state.
Under the new format, most initial errors will look like:
`BTRFS: error (device loop0) in ...`
while subsequent errors will begin with:
`error (device loop0: state E) in ...`
An initial transaction abort error will look like
`error (device loop0: state A) in ...`
and subsequent messages will contain
`(device loop0: state EA) in ...`
In addition to the error states we can also print other states that are
temporary, like remounting, device replace, or indicate a global state
that may affect functionality.
Now implemented:
E - filesystem error detected
A - transaction aborted
L - log tree errors
M - remounting in progress
R - device replace in progress
C - data checksums not verified (mounted with ignoredatacsums)
Signed-off-by: Sweet Tea Dorminy <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Smatch complains about a possible dereference of a pointer that was not
initialized:
CC [M] fs/btrfs/reflink.o
CHECK fs/btrfs/reflink.c
fs/btrfs/reflink.c:533 btrfs_clone() error: potentially dereferencing uninitialized 'trans'.
This is because we are not dealing with the case where the type of a file
extent has an unexpected value (not regular, not prealloc and not inline),
in which case the transaction handle pointer is not initialized.
Such unexpected type should be impossible, except in case of some memory
corruption caused either by bad hardware or some software bug causing
something like a buffer overrun.
So ASSERT that if the extent type is neither regular nor prealloc, then
it must be inline. Bail out with -EUCLEAN and a warning in case it is
not. This silences smatch.
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
When reflinking an inline extent, we assert that its file offset is 0 and
that its uncompressed length is not greater than the sector size. We then
return an error if one of those conditions is not satisfied. However we
use a return statement, which results in returning from btrfs_clone()
without freeing the path and buffer that were allocated before, as well as
not clearing the flag BTRFS_INODE_NO_DELALLOC_FLUSH for the destination
inode.
Fix that by jumping to the 'out' label instead, and also add a WARN_ON()
for each condition so that in case assertions are disabled, we get to
known which of the unexpected conditions triggered the error.
Fixes: a61e1e0df9f321 ("Btrfs: simplify inline extent handling when doing reflinks")
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
When an inode has a last_reflink_trans matching the current transaction,
we have to take special care when logging its checksums in order to
avoid getting checksum items with overlapping ranges in a log tree,
which could result in missing checksums after log replay (more on that
in the changelogs of commit 40e046acbd2f36 ("Btrfs: fix missing data
checksums after replaying a log tree") and commit e289f03ea79bbc ("btrfs:
fix corrupt log due to concurrent fsync of inodes with shared extents")).
We also need to make sure a full fsync will copy all old file extent
items it finds in modified leaves, because they might have been copied
from some other inode.
However once we fsync an inode, we don't need to keep paying the price of
that extra special care in future fsyncs done in the same transaction,
unless the inode is used for another reflink operation or the full sync
flag is set on it (truncate, failure to allocate extent maps for holes,
and other exceptional and infrequent cases).
So after we fsync an inode reset its last_unlink_trans to zero. In case
another reflink happens, we continue to update the last_reflink_trans of
the inode, just as before. Also set last_reflink_trans to the generation
of the last transaction that modified the inode whenever we need to set
the full sync flag on the inode, just like when we need to load an inode
from disk after eviction.
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Doing a full fsync may require processing many leaves of metadata, which
can take some time and result in a task monopolizing a cpu for too long.
So add a cond_resched() after processing a leaf when doing a full fsync,
while not holding any locks on any tree (a subvolume or a log tree).
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
When doing a full fsync, at copy_items(), we iterate over all extents and
then collect their checksums into a list. After copying all the extents to
the log tree, we then log all the previously collected checksums.
Before the previous patch in the series (subject "btrfs: stop copying old
file extents when doing a full fsync"), we had to do it this way, because
while we were iterating over the items in the leaf of the subvolume tree,
we were holding a write lock on a leaf of the log tree, so logging the
checksums for an extent right after we collected them could result in a
deadlock, in case the checksum items ended up in the same leaf.
However after the previous patch in the series we now do a first iteration
over all the items in the leaf of the subvolume tree before locking a path
in the log tree, so we can now log the checksums right after we have
obtained them. This avoids holding in memory all checksums for all extents
in the leaf while copying items from the source leaf to the log tree. The
amount of memory used to hold all checksums of the extents in a leaf can
be significant. For example if a leaf has 200 file extent items referring
to 1M extents, using the default crc32c checksums, would result in using
over 200K of memory (not accounting for the extra overhead of struct
btrfs_ordered_sum), with smaller or less extents it would be less, but
it could be much more with more extents per leaf and/or much larger
extents.
So change copy_items() to log the checksums for an extent after looking
them up, and then free their memory, as they are no longer necessary.
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
When logging an inode in full sync mode, we go over every leaf that was
modified in the current transaction and has items associated to our inode,
and then copy all those items into the log tree. This includes copying
file extent items that were created and added to the inode in past
transactions, which is useless and only makes use more leaf space in the
log tree.
It's common to have a file with many file extent items spanning many
leaves where only a few file extent items are new and need to be logged,
and in such case we log all the file extent items we find in the modified
leaves.
So change the full sync behaviour to skip over file extent items that are
not needed. Those are the ones that match the following criteria:
1) Have a generation older than the current transaction and the inode
was not a target of a reflink operation, as that can copy file extent
items from a past generation from some other inode into our inode, so
we have to log them;
2) Start at an offset within i_size - we must log anything at or beyond
i_size, otherwise we would lose prealloc extents after log replay.
The following script exercises a scenario where this happens, and it's
somehow close enough to what happened often on a SQL Server workload which
I had to debug sometime ago to fix an issue where a pattern of writes to
prealloc extents and fsync resulted in fsync failing with -EIO (that was
commit ea7036de0d36c4 ("btrfs: fix fsync failure and transaction abort
after writes to prealloc extents")). In that particular case, we had large
files that had random writes and were often truncated, which made the
next fsync be a full sync.
$ cat test.sh
#!/bin/bash
DEV=/dev/sdi
MNT=/mnt/sdi
MKFS_OPTIONS="-O no-holes -R free-space-tree"
MOUNT_OPTIONS="-o ssd"
FILE_SIZE=$((1 * 1024 * 1024 * 1024)) # 1G
# FILE_SIZE=$((2 * 1024 * 1024 * 1024)) # 2G
# FILE_SIZE=$((512 * 1024 * 1024)) # 512M
mkfs.btrfs -f $MKFS_OPTIONS $DEV
mount $MOUNT_OPTIONS $DEV $MNT
# Create a file with many extents. Use direct IO to make it faster
# to create the file - using buffered IO we would have to fsync
# after each write (terribly slow).
echo "Creating file with $((FILE_SIZE / 4096)) extents of 4K each..."
xfs_io -f -d -c "pwrite -b 4K 0 $FILE_SIZE" $MNT/foobar
# Commit the transaction, so every extent after this is from an
# old generation.
sync
# Now rewrite only a few extents, which are all far spread apart from
# each other (e.g. 1G / 32M = 32 extents).
# After this only a few extents have a new generation, while all other
# ones have an old generation.
echo "Rewriting $((FILE_SIZE / (32 * 1024 * 1024))) extents..."
for ((i = 0; i < $FILE_SIZE; i += $((32 * 1024 * 1024)))); do
xfs_io -c "pwrite $i 4K" $MNT/foobar >/dev/null
done
# Fsync, the inode logged in full sync mode since it was never fsynced
# before.
echo "Fsyncing file..."
xfs_io -c "fsync" $MNT/foobar
umount $MNT
And the following bpftrace program was running when executing the test
script:
$ cat bpf-script.sh
#!/usr/bin/bpftrace
k:btrfs_log_inode
{
@start_log_inode[tid] = nsecs;
}
kr:btrfs_log_inode
/@start_log_inode[tid]/
{
@log_inode_dur[tid] = (nsecs - @start_log_inode[tid]) / 1000;
delete(@start_log_inode[tid]);
}
k:btrfs_sync_log
{
@start_sync_log[tid] = nsecs;
}
kr:btrfs_sync_log
/@start_sync_log[tid]/
{
$sync_log_dur = (nsecs - @start_sync_log[tid]) / 1000;
printf("btrfs_log_inode() took %llu us\n", @log_inode_dur[tid]);
printf("btrfs_sync_log() took %llu us\n", $sync_log_dur);
delete(@start_sync_log[tid]);
delete(@log_inode_dur[tid]);
exit();
}
With 512M test file, before this patch:
btrfs_log_inode() took 15218 us
btrfs_sync_log() took 1328 us
Log tree has 17 leaves and 1 node, its total size is 294912 bytes.
With 512M test file, after this patch:
btrfs_log_inode() took 14760 us
btrfs_sync_log() took 588 us
Log tree has a single leaf, its total size is 16K.
With 1G test file, before this patch:
btrfs_log_inode() took 27301 us
btrfs_sync_log() took 1767 us
Log tree has 33 leaves and 1 node, its total size is 557056 bytes.
With 1G test file, after this patch:
btrfs_log_inode() took 26166 us
btrfs_sync_log() took 593 us
Log tree has a single leaf, its total size is 16K
With 2G test file, before this patch:
btrfs_log_inode() took 50892 us
btrfs_sync_log() took 3127 us
Log tree has 65 leaves and 1 node, its total size is 1081344 bytes.
With 2G test file, after this patch:
btrfs_log_inode() took 50126 us
btrfs_sync_log() took 586 us
Log tree has a single leaf, its total size is 16K.
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
The submit helper will always run bio_endio() on the bio if it fails to
submit, so cleaning up the bio just leads to a variety of use-after-free
and NULL pointer dereference bugs because we race with the endio
function that is cleaning up the bio. Instead just return BLK_STS_OK as
the repair function has to continue to process the rest of the pages,
and the endio for the repair bio will do the appropriate cleanup for the
page that it was given.
Reviewed-by: Boris Burkov <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
If we fail to submit a bio for whatever reason, we may not have setup a
mirror_num for that bio. This means we shouldn't try to do the repair
workflow, if we do we'll hit an BUG_ON(!failrec->this_mirror) in
clean_io_failure. Instead simply skip the repair workflow if we have no
mirror set, and add an assert to btrfs_check_repairable() to make it
easier to catch what is happening in the future.
Reviewed-by: Boris Burkov <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
I hit some weird panics while fixing up the error handling from
btrfs_lookup_bio_sums(). Turns out the compression path will complete
the bio we use if we set up any of the compression bios and then return
an error, and then btrfs_submit_data_bio() will also call bio_endio() on
the bio.
Fix this by making btrfs_submit_compressed_read() responsible for
calling bio_endio() on the bio if there are any errors. Currently it
was only doing it if we created the compression bios, otherwise it was
depending on btrfs_submit_data_bio() to do the right thing. This
creates the above problem, so fix up btrfs_submit_compressed_read() to
always call bio_endio() in case of an error, and then simply return from
btrfs_submit_data_bio() if we had to call
btrfs_submit_compressed_read().
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
|
|
Right now we just have a binary "errors" flag, so any error we get on
the compressed bio's gets translated to EIO. This isn't necessarily a
bad thing, but if we get an ENOMEM it may be nice to know that's what
happened instead of an EIO. Track our errors as a blk_status_t, and do
the appropriate setting of the errors accordingly.
Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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This bio is usually one of the compressed bio's, and we don't actually
need it in this function, so remove the argument and stop passing it
around.
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>
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