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2022-10-26btrfs: scrub: try to fix super block errorsQu Wenruo
[ Upstream commit f9eab5f0bba76742af654f33d517bf62a0db8f12 ] [BUG] The following script shows that, although scrub can detect super block errors, it never tries to fix it: mkfs.btrfs -f -d raid1 -m raid1 $dev1 $dev2 xfs_io -c "pwrite 67108864 4k" $dev2 mount $dev1 $mnt btrfs scrub start -B $dev2 btrfs scrub start -Br $dev2 umount $mnt The first scrub reports the super error correctly: scrub done for f3289218-abd3-41ac-a630-202f766c0859 Scrub started: Tue Aug 2 14:44:11 2022 Status: finished Duration: 0:00:00 Total to scrub: 1.26GiB Rate: 0.00B/s Error summary: super=1 Corrected: 0 Uncorrectable: 0 Unverified: 0 But the second read-only scrub still reports the same super error: Scrub started: Tue Aug 2 14:44:11 2022 Status: finished Duration: 0:00:00 Total to scrub: 1.26GiB Rate: 0.00B/s Error summary: super=1 Corrected: 0 Uncorrectable: 0 Unverified: 0 [CAUSE] The comments already shows that super block can be easily fixed by committing a transaction: /* * If we find an error in a super block, we just report it. * They will get written with the next transaction commit * anyway */ But the truth is, such assumption is not always true, and since scrub should try to repair every error it found (except for read-only scrub), we should really actively commit a transaction to fix this. [FIX] Just commit a transaction if we found any super block errors, after everything else is done. We cannot do this just after scrub_supers(), as btrfs_commit_transaction() will try to pause and wait for the running scrub, thus we can not call it with scrub_lock hold. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-03-20btrfs: scrub: Don't check free space before marking a block group ROQu Wenruo
commit b12de52896c0e8213f70e3a168fde9e6eee95909 upstream. [BUG] When running btrfs/072 with only one online CPU, it has a pretty high chance to fail: # btrfs/072 12s ... _check_dmesg: something found in dmesg (see xfstests-dev/results//btrfs/072.dmesg) # - output mismatch (see xfstests-dev/results//btrfs/072.out.bad) # --- tests/btrfs/072.out 2019-10-22 15:18:14.008965340 +0800 # +++ /xfstests-dev/results//btrfs/072.out.bad 2019-11-14 15:56:45.877152240 +0800 # @@ -1,2 +1,3 @@ # QA output created by 072 # Silence is golden # +Scrub find errors in "-m dup -d single" test # ... And with the following call trace: BTRFS info (device dm-5): scrub: started on devid 1 ------------[ cut here ]------------ BTRFS: Transaction aborted (error -27) WARNING: CPU: 0 PID: 55087 at fs/btrfs/block-group.c:1890 btrfs_create_pending_block_groups+0x3e6/0x470 [btrfs] CPU: 0 PID: 55087 Comm: btrfs Tainted: G W O 5.4.0-rc1-custom+ #13 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:btrfs_create_pending_block_groups+0x3e6/0x470 [btrfs] Call Trace: __btrfs_end_transaction+0xdb/0x310 [btrfs] btrfs_end_transaction+0x10/0x20 [btrfs] btrfs_inc_block_group_ro+0x1c9/0x210 [btrfs] scrub_enumerate_chunks+0x264/0x940 [btrfs] btrfs_scrub_dev+0x45c/0x8f0 [btrfs] btrfs_ioctl+0x31a1/0x3fb0 [btrfs] do_vfs_ioctl+0x636/0xaa0 ksys_ioctl+0x67/0x90 __x64_sys_ioctl+0x43/0x50 do_syscall_64+0x79/0xe0 entry_SYSCALL_64_after_hwframe+0x49/0xbe ---[ end trace 166c865cec7688e7 ]--- [CAUSE] The error number -27 is -EFBIG, returned from the following call chain: btrfs_end_transaction() |- __btrfs_end_transaction() |- btrfs_create_pending_block_groups() |- btrfs_finish_chunk_alloc() |- btrfs_add_system_chunk() This happens because we have used up all space of btrfs_super_block::sys_chunk_array. The root cause is, we have the following bad loop of creating tons of system chunks: 1. The only SYSTEM chunk is being scrubbed It's very common to have only one SYSTEM chunk. 2. New SYSTEM bg will be allocated As btrfs_inc_block_group_ro() will check if we have enough space after marking current bg RO. If not, then allocate a new chunk. 3. New SYSTEM bg is still empty, will be reclaimed During the reclaim, we will mark it RO again. 4. That newly allocated empty SYSTEM bg get scrubbed We go back to step 2, as the bg is already mark RO but still not cleaned up yet. If the cleaner kthread doesn't get executed fast enough (e.g. only one CPU), then we will get more and more empty SYSTEM chunks, using up all the space of btrfs_super_block::sys_chunk_array. [FIX] Since scrub/dev-replace doesn't always need to allocate new extent, especially chunk tree extent, so we don't really need to do chunk pre-allocation. To break above spiral, here we introduce a new parameter to btrfs_inc_block_group(), @do_chunk_alloc, which indicates whether we need extra chunk pre-allocation. For relocation, we pass @do_chunk_alloc=true, while for scrub, we pass @do_chunk_alloc=false. This should keep unnecessary empty chunks from popping up for scrub. Also, since there are two parameters for btrfs_inc_block_group_ro(), add more comment for it. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-09btrfs: allocate scrub workqueues outside of locksJosef Bacik
commit e89c4a9c8e6ce3a84cab4f342687d3fbbb1234eb upstream. I got the following lockdep splat while testing: ====================================================== WARNING: possible circular locking dependency detected 5.8.0-rc7-00172-g021118712e59 #932 Not tainted ------------------------------------------------------ btrfs/229626 is trying to acquire lock: ffffffff828513f0 (cpu_hotplug_lock){++++}-{0:0}, at: alloc_workqueue+0x378/0x450 but task is already holding lock: ffff889dd3889518 (&fs_info->scrub_lock){+.+.}-{3:3}, at: btrfs_scrub_dev+0x11c/0x630 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (&fs_info->scrub_lock){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 btrfs_scrub_dev+0x11c/0x630 btrfs_dev_replace_by_ioctl.cold.21+0x10a/0x1d4 btrfs_ioctl+0x2799/0x30a0 ksys_ioctl+0x83/0xc0 __x64_sys_ioctl+0x16/0x20 do_syscall_64+0x50/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #6 (&fs_devs->device_list_mutex){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 btrfs_run_dev_stats+0x49/0x480 commit_cowonly_roots+0xb5/0x2a0 btrfs_commit_transaction+0x516/0xa60 sync_filesystem+0x6b/0x90 generic_shutdown_super+0x22/0x100 kill_anon_super+0xe/0x30 btrfs_kill_super+0x12/0x20 deactivate_locked_super+0x29/0x60 cleanup_mnt+0xb8/0x140 task_work_run+0x6d/0xb0 __prepare_exit_to_usermode+0x1cc/0x1e0 do_syscall_64+0x5c/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #5 (&fs_info->tree_log_mutex){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 btrfs_commit_transaction+0x4bb/0xa60 sync_filesystem+0x6b/0x90 generic_shutdown_super+0x22/0x100 kill_anon_super+0xe/0x30 btrfs_kill_super+0x12/0x20 deactivate_locked_super+0x29/0x60 cleanup_mnt+0xb8/0x140 task_work_run+0x6d/0xb0 __prepare_exit_to_usermode+0x1cc/0x1e0 do_syscall_64+0x5c/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #4 (&fs_info->reloc_mutex){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 btrfs_record_root_in_trans+0x43/0x70 start_transaction+0xd1/0x5d0 btrfs_dirty_inode+0x42/0xd0 touch_atime+0xa1/0xd0 btrfs_file_mmap+0x3f/0x60 mmap_region+0x3a4/0x640 do_mmap+0x376/0x580 vm_mmap_pgoff+0xd5/0x120 ksys_mmap_pgoff+0x193/0x230 do_syscall_64+0x50/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #3 (&mm->mmap_lock#2){++++}-{3:3}: __might_fault+0x68/0x90 _copy_to_user+0x1e/0x80 perf_read+0x141/0x2c0 vfs_read+0xad/0x1b0 ksys_read+0x5f/0xe0 do_syscall_64+0x50/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #2 (&cpuctx_mutex){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 perf_event_init_cpu+0x88/0x150 perf_event_init+0x1db/0x20b start_kernel+0x3ae/0x53c secondary_startup_64+0xa4/0xb0 -> #1 (pmus_lock){+.+.}-{3:3}: __mutex_lock+0x9f/0x930 perf_event_init_cpu+0x4f/0x150 cpuhp_invoke_callback+0xb1/0x900 _cpu_up.constprop.26+0x9f/0x130 cpu_up+0x7b/0xc0 bringup_nonboot_cpus+0x4f/0x60 smp_init+0x26/0x71 kernel_init_freeable+0x110/0x258 kernel_init+0xa/0x103 ret_from_fork+0x1f/0x30 -> #0 (cpu_hotplug_lock){++++}-{0:0}: __lock_acquire+0x1272/0x2310 lock_acquire+0x9e/0x360 cpus_read_lock+0x39/0xb0 alloc_workqueue+0x378/0x450 __btrfs_alloc_workqueue+0x15d/0x200 btrfs_alloc_workqueue+0x51/0x160 scrub_workers_get+0x5a/0x170 btrfs_scrub_dev+0x18c/0x630 btrfs_dev_replace_by_ioctl.cold.21+0x10a/0x1d4 btrfs_ioctl+0x2799/0x30a0 ksys_ioctl+0x83/0xc0 __x64_sys_ioctl+0x16/0x20 do_syscall_64+0x50/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 other info that might help us debug this: Chain exists of: cpu_hotplug_lock --> &fs_devs->device_list_mutex --> &fs_info->scrub_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fs_info->scrub_lock); lock(&fs_devs->device_list_mutex); lock(&fs_info->scrub_lock); lock(cpu_hotplug_lock); *** DEADLOCK *** 2 locks held by btrfs/229626: #0: ffff88bfe8bb86e0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_scrub_dev+0xbd/0x630 #1: ffff889dd3889518 (&fs_info->scrub_lock){+.+.}-{3:3}, at: btrfs_scrub_dev+0x11c/0x630 stack backtrace: CPU: 15 PID: 229626 Comm: btrfs Kdump: loaded Not tainted 5.8.0-rc7-00172-g021118712e59 #932 Hardware name: Quanta Tioga Pass Single Side 01-0030993006/Tioga Pass Single Side, BIOS F08_3A18 12/20/2018 Call Trace: dump_stack+0x78/0xa0 check_noncircular+0x165/0x180 __lock_acquire+0x1272/0x2310 lock_acquire+0x9e/0x360 ? alloc_workqueue+0x378/0x450 cpus_read_lock+0x39/0xb0 ? alloc_workqueue+0x378/0x450 alloc_workqueue+0x378/0x450 ? rcu_read_lock_sched_held+0x52/0x80 __btrfs_alloc_workqueue+0x15d/0x200 btrfs_alloc_workqueue+0x51/0x160 scrub_workers_get+0x5a/0x170 btrfs_scrub_dev+0x18c/0x630 ? start_transaction+0xd1/0x5d0 btrfs_dev_replace_by_ioctl.cold.21+0x10a/0x1d4 btrfs_ioctl+0x2799/0x30a0 ? do_sigaction+0x102/0x250 ? lockdep_hardirqs_on_prepare+0xca/0x160 ? _raw_spin_unlock_irq+0x24/0x30 ? trace_hardirqs_on+0x1c/0xe0 ? _raw_spin_unlock_irq+0x24/0x30 ? do_sigaction+0x102/0x250 ? ksys_ioctl+0x83/0xc0 ksys_ioctl+0x83/0xc0 __x64_sys_ioctl+0x16/0x20 do_syscall_64+0x50/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xa9 This happens because we're allocating the scrub workqueues under the scrub and device list mutex, which brings in a whole host of other dependencies. Because the work queue allocation is done with GFP_KERNEL, it can trigger reclaim, which can lead to a transaction commit, which in turns needs the device_list_mutex, it can lead to a deadlock. A different problem for which this fix is a solution. Fix this by moving the actual allocation outside of the scrub lock, and then only take the lock once we're ready to actually assign them to the fs_info. We'll now have to cleanup the workqueues in a few more places, so I've added a helper to do the refcount dance to safely free the workqueues. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-26btrfs: return EROFS for BTRFS_FS_STATE_ERROR casesJosef Bacik
Eric reported seeing this message while running generic/475 BTRFS: error (device dm-3) in btrfs_sync_log:3084: errno=-117 Filesystem corrupted Full stack trace: BTRFS: error (device dm-0) in btrfs_commit_transaction:2323: errno=-5 IO failure (Error while writing out transaction) BTRFS info (device dm-0): forced readonly BTRFS warning (device dm-0): Skipping commit of aborted transaction. ------------[ cut here ]------------ BTRFS: error (device dm-0) in cleanup_transaction:1894: errno=-5 IO failure BTRFS: Transaction aborted (error -117) BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c6480 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c6488 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c6490 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c6498 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c64a0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c64a8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c64b0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c64b8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3555 rw 0,0 sector 0x1c64c0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3572 rw 0,0 sector 0x1b85e8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3572 rw 0,0 sector 0x1b85f0 len 4096 err no 10 WARNING: CPU: 3 PID: 23985 at fs/btrfs/tree-log.c:3084 btrfs_sync_log+0xbc8/0xd60 [btrfs] BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d4288 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d4290 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d4298 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42a0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42a8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42b0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42b8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42c0 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42c8 len 4096 err no 10 BTRFS warning (device dm-0): direct IO failed ino 3548 rw 0,0 sector 0x1d42d0 len 4096 err no 10 CPU: 3 PID: 23985 Comm: fsstress Tainted: G W L 5.8.0-rc4-default+ #1181 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 RIP: 0010:btrfs_sync_log+0xbc8/0xd60 [btrfs] RSP: 0018:ffff909a44d17bd0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: ffff8f3be41cb940 RSI: ffffffffb0108d2b RDI: ffffffffb0108ff7 RBP: ffff909a44d17e70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000037988 R12: ffff8f3bd20e4000 R13: ffff8f3bd20e4428 R14: 00000000ffffff8b R15: ffff909a44d17c70 FS: 00007f6a6ed3fb80(0000) GS:ffff8f3c3dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a6ed3e000 CR3: 00000000525c0003 CR4: 0000000000160ee0 Call Trace: ? finish_wait+0x90/0x90 ? __mutex_unlock_slowpath+0x45/0x2a0 ? lock_acquire+0xa3/0x440 ? lockref_put_or_lock+0x9/0x30 ? dput+0x20/0x4a0 ? dput+0x20/0x4a0 ? do_raw_spin_unlock+0x4b/0xc0 ? _raw_spin_unlock+0x1f/0x30 btrfs_sync_file+0x335/0x490 [btrfs] do_fsync+0x38/0x70 __x64_sys_fsync+0x10/0x20 do_syscall_64+0x50/0xe0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f6a6ef1b6e3 Code: Bad RIP value. RSP: 002b:00007ffd01e20038 EFLAGS: 00000246 ORIG_RAX: 000000000000004a RAX: ffffffffffffffda RBX: 000000000007a120 RCX: 00007f6a6ef1b6e3 RDX: 00007ffd01e1ffa0 RSI: 00007ffd01e1ffa0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000001 R09: 00007ffd01e2004c R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000009f R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [<ffffffffb007fe0b>] copy_process+0x67b/0x1b00 softirqs last enabled at (0): [<ffffffffb007fe0b>] copy_process+0x67b/0x1b00 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace af146e0e38433456 ]--- BTRFS: error (device dm-0) in btrfs_sync_log:3084: errno=-117 Filesystem corrupted This ret came from btrfs_write_marked_extents(). If we get an aborted transaction via EIO before, we'll see it in btree_write_cache_pages() and return EUCLEAN, which gets printed as "Filesystem corrupted". Except we shouldn't be returning EUCLEAN here, we need to be returning EROFS because EUCLEAN is reserved for actual corruption, not IO errors. We are inconsistent about our handling of BTRFS_FS_STATE_ERROR elsewhere, but we want to use EROFS for this particular case. The original transaction abort has the real error code for why we ended up with an aborted transaction, all subsequent actions just need to return EROFS because they may not have a trans handle and have no idea about the original cause of the abort. After patch "btrfs: don't WARN if we abort a transaction with EROFS" the stacktrace will not be dumped either. Reported-by: Eric Sandeen <esandeen@redhat.com> CC: stable@vger.kernel.org # 5.4+ Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> [ add full test stacktrace ] Signed-off-by: David Sterba <dsterba@suse.com>
2020-01-09btrfs: get rid of unique workqueue helper functionsOmar Sandoval
[ Upstream commit a0cac0ec961f0d42828eeef196ac2246a2f07659 ] Commit 9e0af2376434 ("Btrfs: fix task hang under heavy compressed write") worked around the issue that a recycled work item could get a false dependency on the original work item due to how the workqueue code guarantees non-reentrancy. It did so by giving different work functions to different types of work. However, the fixes in the previous few patches are more complete, as they prevent a work item from being recycled at all (except for a tiny window that the kernel workqueue code handles for us). This obsoletes the previous fix, so we don't need the unique helpers for correctness. The only other reason to keep them would be so they show up in stack traces, but they always seem to be optimized to a tail call, so they don't show up anyways. So, let's just get rid of the extra indirection. While we're here, rename normal_work_helper() to the more informative btrfs_work_helper(). Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-31btrfs: don't prematurely free work in scrub_missing_raid56_worker()Omar Sandoval
[ Upstream commit 57d4f0b863272ba04ba85f86bfdc0f976f0af91c ] Currently, scrub_missing_raid56_worker() puts and potentially frees sblock (which embeds the work item) and then submits a bio through scrub_wr_submit(). This is another potential instance of the bug in "btrfs: don't prematurely free work in run_ordered_work()". Fix it by dropping the reference after we submit the bio. Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-09-09btrfs: move basic block_group definitions to their own headerJosef Bacik
This is prep work for moving all of the block group cache code into its own file. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minor comment updates ] Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-02btrfs: add mask for all RAID1 typesDavid Sterba
Preparatory patch for additional RAID1 profiles with more copies. The mask will contain 3-copy and 4-copy, most of the checks for plain RAID1 work the same for the other profiles. Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-01btrfs: directly call into crypto framework for checksummingJohannes Thumshirn
Currently btrfs_csum_data() relied on the crc32c() wrapper around the crypto framework for calculating the CRCs. As we have our own crypto_shash structure in the fs_info now, we can directly call into the crypto framework without going trough the wrapper. This way we can even remove the btrfs_csum_data() and btrfs_csum_final() wrappers. The module dependency on crc32c is preserved via MODULE_SOFTDEP("pre: crc32c"), which was previously provided by LIBCRC32C config option doing the same. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-01btrfs: don't assume ordered sums to be 4 bytesJohannes Thumshirn
BTRFS has the implicit assumption that a checksum in btrfs_orderd_sums is 4 bytes. While this is true for CRC32C, it is not for any other checksum. Change the data type to be a byte array and adjust loop index calculation accordingly. This includes moving the adjustment of 'index' by 'ins_size' in btrfs_csum_file_blocks() before dividing 'ins_size' by the checksum size, because before this patch the 'sums' member of 'struct btrfs_ordered_sum' was 4 Bytes in size and afterwards it is only one byte. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-01btrfs: read number of data stripes from map only onceDavid Sterba
There are several places that call nr_data_stripes, but this value does not change. Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-01btrfs: remove mapping tree structures indirectionDavid Sterba
fs_info::mapping_tree is the physical<->logical mapping tree and uses the same underlying structure as extents, but is embedded to another structure. There are no other members and this indirection is useless. No functional change. Signed-off-by: David Sterba <dsterba@suse.com>
2019-04-29btrfs: get fs_info from device in btrfs_scrub_cancel_devDavid Sterba
We can read fs_info from the device and can drop it from the parameters. Signed-off-by: David Sterba <dsterba@suse.com>
2019-04-29btrfs: scrub: return EAGAIN when fs is closingDavid Sterba
The error code used here is wrong as it's not invalid to try to start scrub when umount has begun. Returning EAGAIN is more user friendly as it's recoverable. Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: init csum_list before possible freeDan Robertson
The scrub_ctx csum_list member must be initialized before scrub_free_ctx is called. If the csum_list is not initialized beforehand, the list_empty call in scrub_free_csums will result in a null deref if the allocation fails in the for loop. Fixes: a2de733c78fa ("btrfs: scrub") CC: stable@vger.kernel.org # 3.0+ Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Dan Robertson <dan@dlrobertson.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: scrub: add assertions for worker pointersDavid Sterba
The scrub worker pointers are not NULL iff the scrub is running, so reset them back once the last reference is dropped. Add assertions to the initial phase of scrub to verify that. Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: scrub: convert scrub_workers_refcnt to refcount_tAnand Jain
Use the refcount_t for fs_info::scrub_workers_refcnt instead of int so we get the extra checks. All reference changes are still done under scrub_lock. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: scrub: add scrub_lock lockdep check in scrub_workers_getAnand Jain
scrub_workers_refcnt is protected by scrub_lock, add lockdep_assert_held() in scrub_workers_get(). Signed-off-by: Anand Jain <anand.jain@oracle.com> Suggested-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: scrub: fix circular locking dependency warningAnand Jain
This fixes a longstanding lockdep warning triggered by fstests/btrfs/011. Circular locking dependency check reports warning[1], that's because the btrfs_scrub_dev() calls the stack #0 below with, the fs_info::scrub_lock held. The test case leading to this warning: $ mkfs.btrfs -f /dev/sdb $ mount /dev/sdb /btrfs $ btrfs scrub start -B /btrfs In fact we have fs_info::scrub_workers_refcnt to track if the init and destroy of the scrub workers are needed. So once we have incremented and decremented the fs_info::scrub_workers_refcnt value in the thread, its ok to drop the scrub_lock, and then actually do the btrfs_destroy_workqueue() part. So this patch drops the scrub_lock before calling btrfs_destroy_workqueue(). [359.258534] ====================================================== [359.260305] WARNING: possible circular locking dependency detected [359.261938] 5.0.0-rc6-default #461 Not tainted [359.263135] ------------------------------------------------------ [359.264672] btrfs/20975 is trying to acquire lock: [359.265927] 00000000d4d32bea ((wq_completion)"%s-%s""btrfs", name){+.+.}, at: flush_workqueue+0x87/0x540 [359.268416] [359.268416] but task is already holding lock: [359.270061] 0000000053ea26a6 (&fs_info->scrub_lock){+.+.}, at: btrfs_scrub_dev+0x322/0x590 [btrfs] [359.272418] [359.272418] which lock already depends on the new lock. [359.272418] [359.274692] [359.274692] the existing dependency chain (in reverse order) is: [359.276671] [359.276671] -> #3 (&fs_info->scrub_lock){+.+.}: [359.278187] __mutex_lock+0x86/0x9c0 [359.279086] btrfs_scrub_pause+0x31/0x100 [btrfs] [359.280421] btrfs_commit_transaction+0x1e4/0x9e0 [btrfs] [359.281931] close_ctree+0x30b/0x350 [btrfs] [359.283208] generic_shutdown_super+0x64/0x100 [359.284516] kill_anon_super+0x14/0x30 [359.285658] btrfs_kill_super+0x12/0xa0 [btrfs] [359.286964] deactivate_locked_super+0x29/0x60 [359.288242] cleanup_mnt+0x3b/0x70 [359.289310] task_work_run+0x98/0xc0 [359.290428] exit_to_usermode_loop+0x83/0x90 [359.291445] do_syscall_64+0x15b/0x180 [359.292598] entry_SYSCALL_64_after_hwframe+0x49/0xbe [359.294011] [359.294011] -> #2 (sb_internal#2){.+.+}: [359.295432] __sb_start_write+0x113/0x1d0 [359.296394] start_transaction+0x369/0x500 [btrfs] [359.297471] btrfs_finish_ordered_io+0x2aa/0x7c0 [btrfs] [359.298629] normal_work_helper+0xcd/0x530 [btrfs] [359.299698] process_one_work+0x246/0x610 [359.300898] worker_thread+0x3c/0x390 [359.302020] kthread+0x116/0x130 [359.303053] ret_from_fork+0x24/0x30 [359.304152] [359.304152] -> #1 ((work_completion)(&work->normal_work)){+.+.}: [359.306100] process_one_work+0x21f/0x610 [359.307302] worker_thread+0x3c/0x390 [359.308465] kthread+0x116/0x130 [359.309357] ret_from_fork+0x24/0x30 [359.310229] [359.310229] -> #0 ((wq_completion)"%s-%s""btrfs", name){+.+.}: [359.311812] lock_acquire+0x90/0x180 [359.312929] flush_workqueue+0xaa/0x540 [359.313845] drain_workqueue+0xa1/0x180 [359.314761] destroy_workqueue+0x17/0x240 [359.315754] btrfs_destroy_workqueue+0x57/0x200 [btrfs] [359.317245] scrub_workers_put+0x2c/0x60 [btrfs] [359.318585] btrfs_scrub_dev+0x336/0x590 [btrfs] [359.319944] btrfs_dev_replace_by_ioctl.cold.19+0x179/0x1bb [btrfs] [359.321622] btrfs_ioctl+0x28a4/0x2e40 [btrfs] [359.322908] do_vfs_ioctl+0xa2/0x6d0 [359.324021] ksys_ioctl+0x3a/0x70 [359.325066] __x64_sys_ioctl+0x16/0x20 [359.326236] do_syscall_64+0x54/0x180 [359.327379] entry_SYSCALL_64_after_hwframe+0x49/0xbe [359.328772] [359.328772] other info that might help us debug this: [359.328772] [359.330990] Chain exists of: [359.330990] (wq_completion)"%s-%s""btrfs", name --> sb_internal#2 --> &fs_info->scrub_lock [359.330990] [359.334376] Possible unsafe locking scenario: [359.334376] [359.336020] CPU0 CPU1 [359.337070] ---- ---- [359.337821] lock(&fs_info->scrub_lock); [359.338506] lock(sb_internal#2); [359.339506] lock(&fs_info->scrub_lock); [359.341461] lock((wq_completion)"%s-%s""btrfs", name); [359.342437] [359.342437] *** DEADLOCK *** [359.342437] [359.343745] 1 lock held by btrfs/20975: [359.344788] #0: 0000000053ea26a6 (&fs_info->scrub_lock){+.+.}, at: btrfs_scrub_dev+0x322/0x590 [btrfs] [359.346778] [359.346778] stack backtrace: [359.347897] CPU: 0 PID: 20975 Comm: btrfs Not tainted 5.0.0-rc6-default #461 [359.348983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.2-0-gf9626cc-prebuilt.qemu-project.org 04/01/2014 [359.350501] Call Trace: [359.350931] dump_stack+0x67/0x90 [359.351676] print_circular_bug.isra.37.cold.56+0x15c/0x195 [359.353569] check_prev_add.constprop.44+0x4f9/0x750 [359.354849] ? check_prev_add.constprop.44+0x286/0x750 [359.356505] __lock_acquire+0xb84/0xf10 [359.357505] lock_acquire+0x90/0x180 [359.358271] ? flush_workqueue+0x87/0x540 [359.359098] flush_workqueue+0xaa/0x540 [359.359912] ? flush_workqueue+0x87/0x540 [359.360740] ? drain_workqueue+0x1e/0x180 [359.361565] ? drain_workqueue+0xa1/0x180 [359.362391] drain_workqueue+0xa1/0x180 [359.363193] destroy_workqueue+0x17/0x240 [359.364539] btrfs_destroy_workqueue+0x57/0x200 [btrfs] [359.365673] scrub_workers_put+0x2c/0x60 [btrfs] [359.366618] btrfs_scrub_dev+0x336/0x590 [btrfs] [359.367594] ? start_transaction+0xa1/0x500 [btrfs] [359.368679] btrfs_dev_replace_by_ioctl.cold.19+0x179/0x1bb [btrfs] [359.369545] btrfs_ioctl+0x28a4/0x2e40 [btrfs] [359.370186] ? __lock_acquire+0x263/0xf10 [359.370777] ? kvm_clock_read+0x14/0x30 [359.371392] ? kvm_sched_clock_read+0x5/0x10 [359.372248] ? sched_clock+0x5/0x10 [359.372786] ? sched_clock_cpu+0xc/0xc0 [359.373662] ? do_vfs_ioctl+0xa2/0x6d0 [359.374552] do_vfs_ioctl+0xa2/0x6d0 [359.375378] ? do_sigaction+0xff/0x250 [359.376233] ksys_ioctl+0x3a/0x70 [359.376954] __x64_sys_ioctl+0x16/0x20 [359.377772] do_syscall_64+0x54/0x180 [359.378841] entry_SYSCALL_64_after_hwframe+0x49/0xbe [359.380422] RIP: 0033:0x7f5429296a97 Backporting to older kernels: scrub_nocow_workers must be freed the same way as the others. CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Anand Jain <anand.jain@oracle.com> [ update changelog ] Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: scrub: print messages when started or finishedAnand Jain
The kernel log messages help debugging and audit, add them for scrub Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: merge btrfs_find_device and find_deviceAnand Jain
Both btrfs_find_device() and find_device() does the same thing except that the latter does not take the seed device onto account in the device scanning context. We can merge them. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2019-02-25btrfs: refactor btrfs_find_device() take fs_devices as argumentAnand Jain
btrfs_find_device() accepts fs_info as an argument and retrieves fs_devices from fs_info. Instead use fs_devices, so that this function can be used in non-mount (during device scanning) context as well. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17btrfs: Fix typos in comments and stringsAndrea Gelmini
The typos accumulate over time so once in a while time they get fixed in a large patch. Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17Btrfs: scrub, move setup of nofs contexts higher in the stackFilipe Manana
Since scrub workers only do memory allocation with GFP_KERNEL when they need to perform repair, we can move the recent setup of the nofs context up to scrub_handle_errored_block() instead of setting it up down the call chain at insert_full_stripe_lock() and scrub_add_page_to_wr_bio(), removing some duplicate code and comment. So the only paths for which a scrub worker can do memory allocations using GFP_KERNEL are the following: scrub_bio_end_io_worker() scrub_block_complete() scrub_handle_errored_block() lock_full_stripe() insert_full_stripe_lock() -> kmalloc with GFP_KERNEL scrub_bio_end_io_worker() scrub_block_complete() scrub_handle_errored_block() scrub_write_page_to_dev_replace() scrub_add_page_to_wr_bio() -> kzalloc with GFP_KERNEL Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17btrfs: scrub: move scrub_setup_ctx allocation out of device_list_mutexDavid Sterba
The scrub context is allocated with GFP_KERNEL and called from btrfs_scrub_dev under the fs_info::device_list_mutex. This is not safe regarding reclaim that could try to flush filesystem data in order to get the memory. And the device_list_mutex is held during superblock commit, so this would cause a lockup. Move the alocation and initialization before any changes that require the mutex. Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17btrfs: scrub: pass fs_info to scrub_setup_ctxDavid Sterba
We can pass fs_info directly as this is the only member of btrfs_device that's bing used inside scrub_setup_ctx. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17btrfs: dev-replace: open code trivial locking helpersDavid Sterba
The dev-replace locking functions are now trivial wrappers around rw semaphore that can be used directly everywhere. No functional change. Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17Btrfs: fix deadlock with memory reclaim during scrubFilipe Manana
When a transaction commit starts, it attempts to pause scrub and it blocks until the scrub is paused. So while the transaction is blocked waiting for scrub to pause, we can not do memory allocation with GFP_KERNEL from scrub, otherwise we risk getting into a deadlock with reclaim. Checking for scrub pause requests is done early at the beginning of the while loop of scrub_stripe() and later in the loop, scrub_extent() and scrub_raid56_parity() are called, which in turn call scrub_pages() and scrub_pages_for_parity() respectively. These last two functions do memory allocations using GFP_KERNEL. Same problem could happen while scrubbing the super blocks, since it calls scrub_pages(). We also can not have any of the worker tasks, created by the scrub task, doing GFP_KERNEL allocations, because before pausing, the scrub task waits for all the worker tasks to complete (also done at scrub_stripe()). So make sure GFP_NOFS is used for the memory allocations because at any time a scrub pause request can happen from another task that started to commit a transaction. Fixes: 58c4e173847a ("btrfs: scrub: use GFP_KERNEL on the submission path") CC: stable@vger.kernel.org # 4.6+ Reviewed-by: Nikolay Borisov <nborisov@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>
2018-10-15btrfs: open code btrfs_dev_replace_stats_incDavid Sterba
The wrapper is too trivial, open coding does not make it less readable. Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-10-15Btrfs: clean up scrub is_dev_replace parameterOmar Sandoval
struct scrub_ctx has an ->is_dev_replace member, so there's no point in passing around is_dev_replace where sctx is available. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: Use wrapper macro for rcu string to remove duplicate codeMisono Tomohiro
Cleanup patch and no functional changes. Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: scrub: cleanup the remaining nodatasum fixup codeQu Wenruo
Remove the remaining code that misused the page cache pages during device replace and could cause data corruption for compressed nodatasum extents. Such files do not normally exist but there's a bug that allows this combination and the corruption was exposed by device replace fixup code. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: Use btrfs_mark_bg_unused to replace open codeQu Wenruo
Introduce a small helper, btrfs_mark_bg_unused(), to acquire locks and add a block group to unused_bgs list. No functional modification, and only 3 callers are involved. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: open-code bio_set_op_attrsDavid Sterba
The helper is trivial and marked as deprecated. Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: Remove fs_info from btrfs_inc_block_group_roNikolay Borisov
It can be referenced from the passed bg cache. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-08-06btrfs: scrub: Remove unused copy_nocow_pages and its callchainQu Wenruo
Since commit ac0b4145d662a3b9e340 ("btrfs: scrub: Don't use inode pages for device replace") the function is not used and we can remove all functions down the call chain. There was an optimization that reused inode pages to speed up device replace, but broke when there was nodatasum and compressed page. The potential performance gain is small so we don't loose much by removing it and using scrub_pages same as the other pages. Signed-off-by: Qu Wenruo <wqu@suse.com> [ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
2018-07-17btrfs: scrub: Don't use inode page cache in scrub_handle_errored_block()Qu Wenruo
In commit ac0b4145d662 ("btrfs: scrub: Don't use inode pages for device replace") we removed the branch of copy_nocow_pages() to avoid corruption for compressed nodatasum extents. However above commit only solves the problem in scrub_extent(), if during scrub_pages() we failed to read some pages, sctx->no_io_error_seen will be non-zero and we go to fixup function scrub_handle_errored_block(). In scrub_handle_errored_block(), for sctx without csum (no matter if we're doing replace or scrub) we go to scrub_fixup_nodatasum() routine, which does the similar thing with copy_nocow_pages(), but does it without the extra check in copy_nocow_pages() routine. So for test cases like btrfs/100, where we emulate read errors during replace/scrub, we could corrupt compressed extent data again. This patch will fix it just by avoiding any "optimization" for nodatasum, just falls back to the normal fixup routine by try read from any good copy. This also solves WARN_ON() or dead lock caused by lame backref iteration in scrub_fixup_nodatasum() routine. The deadlock or WARN_ON() won't be triggered before commit ac0b4145d662 ("btrfs: scrub: Don't use inode pages for device replace") since copy_nocow_pages() have better locking and extra check for data extent, and it's already doing the fixup work by try to read data from any good copy, so it won't go scrub_fixup_nodatasum() anyway. This patch disables the faulty code and will be removed completely in a followup patch. Fixes: ac0b4145d662 ("btrfs: scrub: Don't use inode pages for device replace") Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-06-11btrfs: scrub: Don't use inode pages for device replaceQu Wenruo
[BUG] Btrfs can create compressed extent without checksum (even though it shouldn't), and if we then try to replace device containing such extent, the result device will contain all the uncompressed data instead of the compressed one. Test case already submitted to fstests: https://patchwork.kernel.org/patch/10442353/ [CAUSE] When handling compressed extent without checksum, device replace will goe into copy_nocow_pages() function. In that function, btrfs will get all inodes referring to this data extents and then use find_or_create_page() to get pages direct from that inode. The problem here is, pages directly from inode are always uncompressed. And for compressed data extent, they mismatch with on-disk data. Thus this leads to corrupted compressed data extent written to replace device. [FIX] In this attempt, we could just remove the "optimization" branch, and let unified scrub_pages() to handle it. Although scrub_pages() won't bother reusing page cache, it will be a little slower, but it does the correct csum checking and won't cause such data corruption caused by "optimization". Note about the fix: this is the minimal fix that can be backported to older stable trees without conflicts. The whole callchain from copy_nocow_pages() can be deleted, and will be in followup patches. Fixes: ff023aac3119 ("Btrfs: add code to scrub to copy read data to another disk") CC: stable@vger.kernel.org # 4.4+ Reported-by: James Harvey <jamespharvey20@gmail.com> Reviewed-by: James Harvey <jamespharvey20@gmail.com> Signed-off-by: Qu Wenruo <wqu@suse.com> [ remove code removal, add note why ] Signed-off-by: David Sterba <dsterba@suse.com>
2018-05-28btrfs: trace: Add trace points for unused block groupsQu Wenruo
This patch will add the following trace events: 1) btrfs_remove_block_group For btrfs_remove_block_group() function. Triggered when a block group is really removed. 2) btrfs_add_unused_block_group Triggered which block group is added to unused_bgs list. 3) btrfs_skip_unused_block_group Triggered which unused block group is not deleted. These trace events is pretty handy to debug case related to block group auto remove. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-04-12btrfs: replace GPL boilerplate by SPDX -- sourcesDavid Sterba
Remove GPL boilerplate text (long, short, one-line) and keep the rest, ie. personal, company or original source copyright statements. Add the SPDX header. Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-31btrfs: split dev-replace locking helpers for read and writeDavid Sterba
The current calls are unclear in what way btrfs_dev_replace_lock takes the locks, so drop the argument, split the helpers and use similar naming as for read and write locks. Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-31btrfs: use lockdep_assert_held for mutexesDavid Sterba
Using lockdep_assert_held is preferred, replace mutex_is_locked. Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-31btrfs: Remove unused length var from scrub_handle_errored_blockNikolay Borisov
Added in b5d67f64f9bc ("Btrfs: change scrub to support big blocks") but rendered redundant by be50a8ddaae1 ("Btrfs: Simplify scrub_setup_recheck_block()'s argument"). Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-31Btrfs: scrub: batch rebuild for raid56Liu Bo
In case of raid56, writes and rebuilds always take BTRFS_STRIPE_LEN(64K) as unit, however, scrub_extent() sets blocksize as unit, so rebuild process may be triggered on every block on a same stripe. A typical example would be that when we're replacing a disappeared disk, all reads on the disks get -EIO, every block (size is 4K if blocksize is 4K) would go thru these, scrub_handle_errored_block scrub_recheck_block # re-read pages one by one scrub_recheck_block # rebuild by calling raid56_parity_recover() page by page Although with raid56 stripe cache most of reads during rebuild can be avoided, the parity recover calculation(xor or raid6 algorithms) needs to be done $(BTRFS_STRIPE_LEN / blocksize) times. This makes it smarter by doing raid56 scrub/replace on stripe length. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-26Btrfs: dev-replace: make sure target is identical to source when raid56 ↵Liu Bo
rebuild fails In the last step of scrub_handle_error_block, we try to combine good copies on all possible mirrors, this works fine for raid1 and raid10, but not for raid56 as it's doing parity rebuild. If parity rebuild doesn't get back with correct data which matches its checksum, in case of replace we'd rather write what is stored in the source device than the data calculuated from parity. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-26Btrfs: dev-replace: skip prealloc extents when copy nocow pagesLiu Bo
It doens't make sense to process prealloc extents as pages will be filled with zero when reading prealloc extents. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-03-26btrfs: not a disk error if the bio_add_page failsAnand Jain
bio_add_page() can fail for logical reasons as from the bio_add_page() comments: /* * This will only fail if either bio->bi_vcnt == bio->bi_max_vecs or * it's a cloned bio. */ Here we have just allocated the bio, so both of those failures can't occur. So drop the check. We can also drop the error stats for write error. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-01-22btrfs: rename btrfs_device::scrub_device to scrub_ctxAnand Jain
btrfs_device::scrub_device is not a device which is being scrubbed, but it holds the scrub context, so rename to reflect the same. No functional changes here. Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-01-22Btrfs: fix scrub to repair raid6 corruptionLiu Bo
The raid6 corruption is that, suppose that all disks can be read without problems and if the content that was read out doesn't match its checksum, currently for raid6 btrfs at most retries twice, - the 1st retry is to rebuild with all other stripes, it'll eventually be a raid5 xor rebuild, - if the 1st fails, the 2nd retry will deliberately fail parity p so that it will do raid6 style rebuild, however, the chances are that another non-parity stripe content also has something corrupted, so that the above retries are not able to return correct content. We've fixed normal reads to rebuild raid6 correctly with more retries in Patch "Btrfs: make raid6 rebuild retry more"[1], this is to fix scrub to do the exactly same rebuild process. [1]: https://patchwork.kernel.org/patch/10091755/ Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2018-01-22btrfs: sink unlock_extent parameter gfp_flagsDavid Sterba
All callers pass either GFP_NOFS or GFP_KERNEL now, so we can sink the parameter to the function, though we lose some of the slightly better semantics of GFP_KERNEL in some places, it's worth cleaning up the callchains. Signed-off-by: David Sterba <dsterba@suse.com>
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