Regular for-next build test #1157
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If we break out of the loop because an extent buffer doesn't have the bit EXTENT_BUFFER_TREE_REF set, we end up unlocking the xarray twice, once before we tested for the bit and break out of the loop, and once again after the loop. Fix this by testing the bit and exiting before unlocking the xarray. The time spent testing the bit is negligible and it's not worth trying to do that outside the critical section delimited by the xarray lock due to the code complexity required to avoid it (like using a local boolean variable to track whether the xarray is locked or not). The xarray unlock only needs to be done before calling release_extent_buffer(), as that needs to lock the xarray (through xa_cmpxchg_irq()) and does a more significant amount of work. Fixes: 19d7f65 ("btrfs: convert the buffer_radix to an xarray") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Link: https://lore.kernel.org/linux-btrfs/aDRNDU0GM1_D4Xnw@stanley.mountain/ Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
In a few places where we call read_one_inode(), if we get a NULL pointer we end up jumping into an error path, or fallthrough in case of __add_inode_ref(), where we then do something like this: iput(&inode->vfs_inode); which results in an invalid inode pointer that triggers an invalid memory access, resulting in a crash. Fix this by making sure we don't do such dereferences. Fixes: b4c50cb ("btrfs: return a btrfs_inode from read_one_inode()") CC: stable@vger.kernel.org # 6.15+ Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
If there's an unexpected (invalid) extent type, we just silently ignore it. This means a corruption or some bug somewhere, so instead return -EUCLEAN to the caller, making log replay fail, and print an error message with relevant information. Reviewed-by: Boris Burkov <boris@bur.io> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
With all the preparation patches already merged, it's pretty easy to enable large data folios: - Remove the ASSERT() on folio size in btrfs_end_repair_bio() - Add a helper to properly set the max folio order Currently due to several call sites are fetching the bitmap content directly into an unsigned long, we can only support BITS_PER_LONG blocks for each bitmap. - Call the helper when reading/creating an inode The support has the following limits: - No large folios for data reloc inode The relocation code still requires page sized folio. But it's not that hot nor common compared to regular buffered ios. Will be improved in the future. - Requires CONFIG_BTRFS_EXPERIMENTAL Unfortunately I do not have a physical machine for performance test, but if everything goes like XFS/EXT4, it should mostly bring single digits percentage performance improvement in the real world. Although I believe there are still quite some optimizations to be done, let's focus on testing the current large data folio support first. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The inode_lock field of struct btrfs_root was removed in commit e2844cc("btrfs: remove inode_lock from struct btrfs_root and use xarray locks") but the related comment haven't been updated. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Sun YangKai <sunk67188@gmail.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
When building the free space tree with the block group tree feature enabled, we can hit an assertion failure like this: BTRFS info (device loop0 state M): rebuilding free space tree assertion failed: ret == 0, in fs/btrfs/free-space-tree.c:1102 ------------[ cut here ]------------ kernel BUG at fs/btrfs/free-space-tree.c:1102! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 6592 Comm: syz-executor322 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102 lr : populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102 sp : ffff8000a4ce7600 x29: ffff8000a4ce76e0 x28: ffff0000c9bc6000 x27: ffff0000ddfff3d8 x26: ffff0000ddfff378 x25: dfff800000000000 x24: 0000000000000001 x23: ffff8000a4ce7660 x22: ffff70001499cecc x21: ffff0000e1d8c160 x20: ffff0000e1cb7800 x19: ffff0000e1d8c0b0 x18: 00000000ffffffff x17: ffff800092f39000 x16: ffff80008ad27e48 x15: ffff700011e740c0 x14: 1ffff00011e740c0 x13: 0000000000000004 x12: ffffffffffffffff x11: ffff700011e740c0 x10: 0000000000ff0100 x9 : 94ef24f55d2dbc00 x8 : 94ef24f55d2dbc00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a4ce6f98 x4 : ffff80008f415ba0 x3 : ffff800080548ef0 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 000000000000003e Call trace: populate_free_space_tree+0x514/0x518 fs/btrfs/free-space-tree.c:1102 (P) btrfs_rebuild_free_space_tree+0x14c/0x54c fs/btrfs/free-space-tree.c:1337 btrfs_start_pre_rw_mount+0xa78/0xe10 fs/btrfs/disk-io.c:3074 btrfs_remount_rw fs/btrfs/super.c:1319 [inline] btrfs_reconfigure+0x828/0x2418 fs/btrfs/super.c:1543 reconfigure_super+0x1d4/0x6f0 fs/super.c:1083 do_remount fs/namespace.c:3365 [inline] path_mount+0xb34/0xde0 fs/namespace.c:4200 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount fs/namespace.c:4409 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4409 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: f0047182 91178042 528089c3 9771d47 (d4210000) ---[ end trace 0000000000000000 ]--- This happens because we are processing an empty block group, which has no extents allocated from it, there are no items for this block group, including the block group item since block group items are stored in a dedicated tree when using the block group tree feature. It also means this is the block group with the highest start offset, so there are no higher keys in the extent root, hence btrfs_search_slot_for_read() returns 1 (no higher key found). Fix this by asserting 'ret' is 0 only if the block group tree feature is not enabled, in which case we should find a block group item for the block group since it's stored in the extent root and block group item keys are greater than extent item keys (the value for BTRFS_BLOCK_GROUP_ITEM_KEY is 192 and for BTRFS_EXTENT_ITEM_KEY and BTRFS_METADATA_ITEM_KEY the values are 168 and 169 respectively). In case 'ret' is 1, we just need to add a record to the free space tree which spans the whole block group, and we can achieve this by making 'ret == 0' as the while loop's condition. Reported-by: syzbot+36fae25c35159a763a2a@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-btrfs/6841dca8.a00a0220.d4325.0020.GAE@google.com/ 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>
Syzbot reported an assertion failure due to an attempt to add a delayed iput after we have set BTRFS_FS_STATE_NO_DELAYED_IPUT in the fs_info state: WARNING: CPU: 0 PID: 65 at fs/btrfs/inode.c:3420 btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420 Modules linked in: CPU: 0 UID: 0 PID: 65 Comm: kworker/u8:4 Not tainted 6.15.0-next-20250530-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: btrfs-endio-write btrfs_work_helper RIP: 0010:btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420 Code: 4e ad 5d (...) RSP: 0018:ffffc9000213f780 EFLAGS: 00010293 RAX: ffffffff83c635b7 RBX: ffff888058920000 RCX: ffff88801c769e00 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff888058921b67 R09: 1ffff1100b12436c R10: dffffc0000000000 R11: ffffed100b12436d R12: 0000000000000001 R13: dffffc0000000000 R14: ffff88807d748000 R15: 0000000000000100 FS: 0000000000000000(0000) GS:ffff888125c53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000bd038 CR3: 000000006a142000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> btrfs_put_ordered_extent+0x19f/0x470 fs/btrfs/ordered-data.c:635 btrfs_finish_one_ordered+0x11d8/0x1b10 fs/btrfs/inode.c:3312 btrfs_work_helper+0x399/0xc20 fs/btrfs/async-thread.c:312 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> This can happen due to a race with the async reclaim worker like this: 1) The async metadata reclaim worker enters shrink_delalloc(), which calls btrfs_start_delalloc_roots() with an nr_pages argument that has a value less than LONG_MAX, and that in turn enters start_delalloc_inodes(), which sets the local variable 'full_flush' to false because wbc->nr_to_write is less than LONG_MAX; 2) There it finds inode X in a root's delalloc list, grabs a reference for inode X (with igrab()), and triggers writeback for it with filemap_fdatawrite_wbc(), which creates an ordered extent for inode X; 3) The unmount sequence starts from another task, we enter close_ctree() and we flush the workqueue fs_info->endio_write_workers, which waits for the ordered extent for inode X to complete and when dropping the last reference of the ordered extent, with btrfs_put_ordered_extent(), when we call btrfs_add_delayed_iput() we don't add the inode to the list of delayed iputs because it has a refcount of 2, so we decrement it to 1 and return; 4) Shortly after at close_ctree() we call btrfs_run_delayed_iputs() which runs all delayed iputs, and then we set BTRFS_FS_STATE_NO_DELAYED_IPUT in the fs_info state; 5) The async reclaim worker, after calling filemap_fdatawrite_wbc(), now calls btrfs_add_delayed_iput() for inode X and there we trigger an assertion failure since the fs_info state has the flag BTRFS_FS_STATE_NO_DELAYED_IPUT set. Fix this by setting BTRFS_FS_STATE_NO_DELAYED_IPUT only after we wait for the async reclaim workers to finish, after we call cancel_work_sync() for them at close_ctree(), and by running delayed iputs after wait for the reclaim workers to finish and before setting the bit. This race was recently introduced by commit 19e60b2 ("btrfs: add extra warning if delayed iput is added when it's not allowed"). Without the new validation at btrfs_add_delayed_iput(), this described scenario was safe because close_ctree() later calls btrfs_commit_super(). That will run any final delayed iputs added by reclaim workers in the window between the btrfs_run_delayed_iputs() and the the reclaim workers being shut down. Reported-by: syzbot+0ed30ad435bf6f5b7a42@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-btrfs/6840481c.a00a0220.d4325.000c.GAE@google.com/T/#u Fixes: 19e60b2 ("btrfs: add extra warning if delayed iput is added when it's not allowed") Reviewed-by: Boris Burkov <boris@bur.io> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
We can avoid potential memory allocation failure in btrfs_evict_inode() as the block reserve lifetime is limited to the scope of the function. This requires +48 bytes on stack. Signed-off-by: David Sterba <dsterba@suse.com>
We can avoid potential memory allocation failure in btrfs_truncate() as the block reserve lifetime is limited to the scope of the function. This requires +48 bytes on stack. Signed-off-by: David Sterba <dsterba@suse.com>
…extents() We can avoid potential memory allocation failure in btrfs_replace_file_extents() as the block reserve lifetime is limited to the scope of the function. This requires +48 bytes on stack. Signed-off-by: David Sterba <dsterba@suse.com>
[BUG] There is syzbot based reproducer that can crash the kernel, with the following call trace: (With some debug output added) DEBUG: rescue=ibadroots parsed BTRFS: device fsid 14d642db-7b15-43e4-81e6-4b8fac6a25f8 devid 1 transid 8 /dev/loop0 (7:0) scanned by repro (1010) BTRFS info (device loop0): first mount of filesystem 14d642db-7b15-43e4-81e6-4b8fac6a25f8 BTRFS info (device loop0): using blake2b (blake2b-256-generic) checksum algorithm BTRFS info (device loop0): using free-space-tree BTRFS warning (device loop0): checksum verify failed on logical 5312512 mirror 1 wanted 0xb043382657aede36608fd3386d6b001692ff406164733d94e2d9a180412c6003 found 0x810ceb2bacb7f0f9eb2bf3b2b15c02af867cb35ad450898169f3b1f0bd818651 level 0 DEBUG: read tree root path failed for tree csum, ret=-5 BTRFS warning (device loop0): checksum verify failed on logical 5328896 mirror 1 wanted 0x51be4e8b303da58e6340226815b70e3a93592dac3f30dd510c7517454de8567a found 0x51be4e8b303da58e634022a315b70e3a93592dac3f30dd510c7517454de8567a level 0 BTRFS warning (device loop0): checksum verify failed on logical 5292032 mirror 1 wanted 0x1924ccd683be9efc2fa98582ef58760e3848e9043db8649ee382681e220cdee4 found 0x0cb6184f6e8799d9f8cb335dccd1d1832da1071d12290dab3b85b587ecacca6e level 0 process 'repro' launched './file2' with NULL argv: empty string added DEBUG: no csum root, idatacsums=0 ibadroots=134217728 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000041: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000208-0x000000000000020f] CPU: 5 UID: 0 PID: 1010 Comm: repro Tainted: G OE 6.15.0-custom+ #249 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:btrfs_lookup_csum+0x93/0x3d0 [btrfs] Call Trace: <TASK> btrfs_lookup_bio_sums+0x47a/0xdf0 [btrfs] btrfs_submit_bbio+0x43e/0x1a80 [btrfs] submit_one_bio+0xde/0x160 [btrfs] btrfs_readahead+0x498/0x6a0 [btrfs] read_pages+0x1c3/0xb20 page_cache_ra_order+0x4b5/0xc20 filemap_get_pages+0x2d3/0x19e0 filemap_read+0x314/0xde0 __kernel_read+0x35b/0x900 bprm_execve+0x62e/0x1140 do_execveat_common.isra.0+0x3fc/0x520 __x64_sys_execveat+0xdc/0x130 do_syscall_64+0x54/0x1d0 entry_SYSCALL_64_after_hwframe+0x76/0x7e ---[ end trace 0000000000000000 ]--- [CAUSE] Firstly the fs has a corrupted csum tree root, thus to mount the fs we have to go "ro,rescue=ibadroots" mount option. Normally with that mount option, a bad csum tree root should set BTRFS_FS_STATE_NO_DATA_CSUMS flag, so that any future data read will ignore csum search. But in this particular case, we have the following call trace that caused NULL csum root, but not setting BTRFS_FS_STATE_NO_DATA_CSUMS: load_global_roots_objectid(): ret = btrfs_search_slot(); /* Succeeded */ btrfs_item_key_to_cpu() found = true; /* We found the root item for csum tree. */ root = read_tree_root_path(); if (IS_ERR(root)) { if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) /* * Since we have rescue=ibadroots mount option, * @ret is still 0. */ break; if (!found || ret) { /* @found is true, @ret is 0, error handling for csum * tree is skipped. */ } This means we completely skipped to set BTRFS_FS_STATE_NO_DATA_CSUMS if the csum tree is corrupted, which results unexpected later csum lookup. [FIX] If read_tree_root_path() failed, always populate @ret to the error number. As at the end of the function, we need @ret to determine if we need to do the extra error handling for csum tree. Fixes: abed4aa ("btrfs: track the csum, extent, and free space trees in a rb tree") Reported-by: Zhiyu Zhang <zhiyuzhang999@gmail.com> Reported-by: Longxing Li <coregee2000@gmail.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Two remaining cases where we can use the helper. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
A few more remaining cases where we can use the helper. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
…ock groups When one of two zones composing a DUP block group is a conventional zone, we have the zone_info[i]->alloc_offset = WP_CONVENTIONAL. That will, of course, not match the write pointer of the other zone, and fails that block group. This commit solves that issue by properly recovering the emulated write pointer from the last allocated extent. The offset for the SINGLE, DUP, and RAID1 are straight-forward: it is same as the end of last allocated extent. The RAID0 and RAID10 are a bit tricky that we need to do the math of striping. This is the kernel equivalent of Naohiro's user-space commit: "btrfs-progs: zoned: fix alloc_offset calculation for partly conventional block groups". Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
Create a block group dedicated for data relocation on mount of a zoned filesystem. If there is already more than one empty DATA block group on mount, this one is picked for the data relocation block group, instead of a newly created one. This is done to ensure, there is always space for performing garbage collection and the filesystem is not hitting ENOSPC under heavy overwrite workloads. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
The helper is trivial and we can simply use kfree_rcu() if needed. In our case it's just one place where we rename a device in device_list_add() and the old name can still be used until the end of the RCU grace period. The other case is freeing a device and there nothing should reach the device, so we can use plain kfree(). Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The RCU-string API has never taken off and we don't use the printk helpers provided as we do the protection in our helpers. Remove the "in RCU" wrappers. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
We're using the following levels: crit, err, warn, info, debug. This covers our needs and further specializations is not needed, so let's remove emerg, alert and notice. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
We have two versions of message helpers, one that provides RCU protection around the call in case we need to dereference device name. As messages are not performance critical we can set up the RCU protection for all of them and drop the distinction for those where device name is needed. This will lead to further simplifications. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The RCU protection is now done in the plain helpers, we can remove the "_in_rcu" and "_rl_in_rcu". Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The RCU protection is now done in the plain helpers, we can remove the "_in_rcu" and "_rl_in_rcu". Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The RCU protection is now done in the plain helpers, we can remove the "_in_rcu" and "_rl_in_rcu". Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The RCU protection is now done in the plain helpers, we can remove the "_in_rcu" and "_rl_in_rcu". Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Remove the critical level message helpers as they're not used, the RCU protection is provided by the plain helpers. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
The btrfs_debug() helpers depend on various config options. In case of "no_printk" we don't need to define a special helper that in the end does nothing but validates the parameters. As the default build config is to validate the parameters we can simplify it to let the debug helpers expand to nothing and remove btrfs_no_printk_in_rcu(). To avoid warnings use fs_info and inline one variable in extent_from_logical(). Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
There's only one caller of btrfs_printk_ratelimited(), merge it there. Reviewed-by: Daniel Vacek <neelx@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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