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Filipe Manana d5f996bea4 btrfs: fix transaction leak and crash after RO remount caused by qgroup rescan 
[ Upstream commit cb13eea3b4 ]

If we remount a filesystem in RO mode while the qgroup rescan worker is
running, we can end up having it still running after the remount is done,
and at unmount time we may end up with an open transaction that ends up
never getting committed. If that happens we end up with several memory
leaks and can crash when hardware acceleration is unavailable for crc32c.
Possibly it can lead to other nasty surprises too, due to use-after-free
issues.

The following steps explain how the problem happens.

1) We have a filesystem mounted in RW mode and the qgroup rescan worker is
   running;

2) We remount the filesystem in RO mode, and never stop/pause the rescan
   worker, so after the remount the rescan worker is still running. The
   important detail here is that the rescan task is still running after
   the remount operation committed any ongoing transaction through its
   call to btrfs_commit_super();

3) The rescan is still running, and after the remount completed, the
   rescan worker started a transaction, after it finished iterating all
   leaves of the extent tree, to update the qgroup status item in the
   quotas tree. It does not commit the transaction, it only releases its
   handle on the transaction;

4) A filesystem unmount operation starts shortly after;

5) The unmount task, at close_ctree(), stops the transaction kthread,
   which had not had a chance to commit the open transaction since it was
   sleeping and the commit interval (default of 30 seconds) has not yet
   elapsed since the last time it committed a transaction;

6) So after stopping the transaction kthread we still have the transaction
   used to update the qgroup status item open. At close_ctree(), when the
   filesystem is in RO mode and no transaction abort happened (or the
   filesystem is in error mode), we do not expect to have any transaction
   open, so we do not call btrfs_commit_super();

7) We then proceed to destroy the work queues, free the roots and block
   groups, etc. After that we drop the last reference on the btree inode
   by calling iput() on it. Since there are dirty pages for the btree
   inode, corresponding to the COWed extent buffer for the quotas btree,
   btree_write_cache_pages() is invoked to flush those dirty pages. This
   results in creating a bio and submitting it, which makes us end up at
   btrfs_submit_metadata_bio();

8) At btrfs_submit_metadata_bio() we end up at the if-then-else branch
   that calls btrfs_wq_submit_bio(), because check_async_write() returned
   a value of 1. This value of 1 is because we did not have hardware
   acceleration available for crc32c, so BTRFS_FS_CSUM_IMPL_FAST was not
   set in fs_info->flags;

9) Then at btrfs_wq_submit_bio() we call btrfs_queue_work() against the
   workqueue at fs_info->workers, which was already freed before by the
   call to btrfs_stop_all_workers() at close_ctree(). This results in an
   invalid memory access due to a use-after-free, leading to a crash.

When this happens, before the crash there are several warnings triggered,
since we have reserved metadata space in a block group, the delayed refs
reservation, etc:

  ------------[ cut here ]------------
  WARNING: CPU: 4 PID: 1729896 at fs/btrfs/block-group.c:125 btrfs_put_block_group+0x63/0xa0 [btrfs]
  Modules linked in: btrfs dm_snapshot dm_thin_pool (...)
  CPU: 4 PID: 1729896 Comm: umount Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  RIP: 0010:btrfs_put_block_group+0x63/0xa0 [btrfs]
  Code: f0 01 00 00 48 39 c2 75 (...)
  RSP: 0018:ffffb270826bbdd8 EFLAGS: 00010206
  RAX: 0000000000000001 RBX: ffff947ed73e4000 RCX: ffff947ebc8b29c8
  RDX: 0000000000000001 RSI: ffffffffc0b150a0 RDI: ffff947ebc8b2800
  RBP: ffff947ebc8b2800 R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000001 R12: ffff947ed73e4110
  R13: ffff947ed73e4160 R14: ffff947ebc8b2988 R15: dead000000000100
  FS:  00007f15edfea840(0000) GS:ffff9481ad600000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f37e2893320 CR3: 0000000138f68001 CR4: 00000000003706e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   btrfs_free_block_groups+0x17f/0x2f0 [btrfs]
   close_ctree+0x2ba/0x2fa [btrfs]
   generic_shutdown_super+0x6c/0x100
   kill_anon_super+0x14/0x30
   btrfs_kill_super+0x12/0x20 [btrfs]
   deactivate_locked_super+0x31/0x70
   cleanup_mnt+0x100/0x160
   task_work_run+0x68/0xb0
   exit_to_user_mode_prepare+0x1bb/0x1c0
   syscall_exit_to_user_mode+0x4b/0x260
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f15ee221ee7
  Code: ff 0b 00 f7 d8 64 89 01 48 (...)
  RSP: 002b:00007ffe9470f0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
  RAX: 0000000000000000 RBX: 00007f15ee347264 RCX: 00007f15ee221ee7
  RDX: ffffffffffffff78 RSI: 0000000000000000 RDI: 000056169701d000
  RBP: 0000561697018a30 R08: 0000000000000000 R09: 00007f15ee2e2be0
  R10: 000056169701efe0 R11: 0000000000000246 R12: 0000000000000000
  R13: 000056169701d000 R14: 0000561697018b40 R15: 0000561697018c60
  irq event stamp: 0
  hardirqs last  enabled at (0): [<0000000000000000>] 0x0
  hardirqs last disabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last  enabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last disabled at (0): [<0000000000000000>] 0x0
  ---[ end trace dd74718fef1ed5c6 ]---
  ------------[ cut here ]------------
  WARNING: CPU: 2 PID: 1729896 at fs/btrfs/block-rsv.c:459 btrfs_release_global_block_rsv+0x70/0xc0 [btrfs]
  Modules linked in: btrfs dm_snapshot dm_thin_pool (...)
  CPU: 2 PID: 1729896 Comm: umount Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  RIP: 0010:btrfs_release_global_block_rsv+0x70/0xc0 [btrfs]
  Code: 48 83 bb b0 03 00 00 00 (...)
  RSP: 0018:ffffb270826bbdd8 EFLAGS: 00010206
  RAX: 000000000033c000 RBX: ffff947ed73e4000 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: ffffffffc0b0d8c1 RDI: 00000000ffffffff
  RBP: ffff947ebc8b7000 R08: 0000000000000001 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000001 R12: ffff947ed73e4110
  R13: ffff947ed73e5278 R14: dead000000000122 R15: dead000000000100
  FS:  00007f15edfea840(0000) GS:ffff9481aca00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000561a79f76e20 CR3: 0000000138f68006 CR4: 00000000003706e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   btrfs_free_block_groups+0x24c/0x2f0 [btrfs]
   close_ctree+0x2ba/0x2fa [btrfs]
   generic_shutdown_super+0x6c/0x100
   kill_anon_super+0x14/0x30
   btrfs_kill_super+0x12/0x20 [btrfs]
   deactivate_locked_super+0x31/0x70
   cleanup_mnt+0x100/0x160
   task_work_run+0x68/0xb0
   exit_to_user_mode_prepare+0x1bb/0x1c0
   syscall_exit_to_user_mode+0x4b/0x260
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f15ee221ee7
  Code: ff 0b 00 f7 d8 64 89 01 (...)
  RSP: 002b:00007ffe9470f0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
  RAX: 0000000000000000 RBX: 00007f15ee347264 RCX: 00007f15ee221ee7
  RDX: ffffffffffffff78 RSI: 0000000000000000 RDI: 000056169701d000
  RBP: 0000561697018a30 R08: 0000000000000000 R09: 00007f15ee2e2be0
  R10: 000056169701efe0 R11: 0000000000000246 R12: 0000000000000000
  R13: 000056169701d000 R14: 0000561697018b40 R15: 0000561697018c60
  irq event stamp: 0
  hardirqs last  enabled at (0): [<0000000000000000>] 0x0
  hardirqs last disabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last  enabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last disabled at (0): [<0000000000000000>] 0x0
  ---[ end trace dd74718fef1ed5c7 ]---
  ------------[ cut here ]------------
  WARNING: CPU: 2 PID: 1729896 at fs/btrfs/block-group.c:3377 btrfs_free_block_groups+0x25d/0x2f0 [btrfs]
  Modules linked in: btrfs dm_snapshot dm_thin_pool (...)
  CPU: 5 PID: 1729896 Comm: umount Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  RIP: 0010:btrfs_free_block_groups+0x25d/0x2f0 [btrfs]
  Code: ad de 49 be 22 01 00 (...)
  RSP: 0018:ffffb270826bbde8 EFLAGS: 00010206
  RAX: ffff947ebeae1d08 RBX: ffff947ed73e4000 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: ffff947e9d823ae8 RDI: 0000000000000246
  RBP: ffff947ebeae1d08 R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000001 R12: ffff947ebeae1c00
  R13: ffff947ed73e5278 R14: dead000000000122 R15: dead000000000100
  FS:  00007f15edfea840(0000) GS:ffff9481ad200000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f1475d98ea8 CR3: 0000000138f68005 CR4: 00000000003706e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   close_ctree+0x2ba/0x2fa [btrfs]
   generic_shutdown_super+0x6c/0x100
   kill_anon_super+0x14/0x30
   btrfs_kill_super+0x12/0x20 [btrfs]
   deactivate_locked_super+0x31/0x70
   cleanup_mnt+0x100/0x160
   task_work_run+0x68/0xb0
   exit_to_user_mode_prepare+0x1bb/0x1c0
   syscall_exit_to_user_mode+0x4b/0x260
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f15ee221ee7
  Code: ff 0b 00 f7 d8 64 89 (...)
  RSP: 002b:00007ffe9470f0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
  RAX: 0000000000000000 RBX: 00007f15ee347264 RCX: 00007f15ee221ee7
  RDX: ffffffffffffff78 RSI: 0000000000000000 RDI: 000056169701d000
  RBP: 0000561697018a30 R08: 0000000000000000 R09: 00007f15ee2e2be0
  R10: 000056169701efe0 R11: 0000000000000246 R12: 0000000000000000
  R13: 000056169701d000 R14: 0000561697018b40 R15: 0000561697018c60
  irq event stamp: 0
  hardirqs last  enabled at (0): [<0000000000000000>] 0x0
  hardirqs last disabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last  enabled at (0): [<ffffffff8bcae560>] copy_process+0x8a0/0x1d70
  softirqs last disabled at (0): [<0000000000000000>] 0x0
  ---[ end trace dd74718fef1ed5c8 ]---
  BTRFS info (device sdc): space_info 4 has 268238848 free, is not full
  BTRFS info (device sdc): space_info total=268435456, used=114688, pinned=0, reserved=16384, may_use=0, readonly=65536
  BTRFS info (device sdc): global_block_rsv: size 0 reserved 0
  BTRFS info (device sdc): trans_block_rsv: size 0 reserved 0
  BTRFS info (device sdc): chunk_block_rsv: size 0 reserved 0
  BTRFS info (device sdc): delayed_block_rsv: size 0 reserved 0
  BTRFS info (device sdc): delayed_refs_rsv: size 524288 reserved 0

And the crash, which only happens when we do not have crc32c hardware
acceleration, produces the following trace immediately after those
warnings:

  stack segment: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI
  CPU: 2 PID: 1749129 Comm: umount Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  RIP: 0010:btrfs_queue_work+0x36/0x190 [btrfs]
  Code: 54 55 53 48 89 f3 (...)
  RSP: 0018:ffffb27082443ae8 EFLAGS: 00010282
  RAX: 0000000000000004 RBX: ffff94810ee9ad90 RCX: 0000000000000000
  RDX: 0000000000000001 RSI: ffff94810ee9ad90 RDI: ffff947ed8ee75a0
  RBP: a56b6b6b6b6b6b6b R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000007 R11: 0000000000000001 R12: ffff947fa9b435a8
  R13: ffff94810ee9ad90 R14: 0000000000000000 R15: ffff947e93dc0000
  FS:  00007f3cfe974840(0000) GS:ffff9481ac600000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f1b42995a70 CR3: 0000000127638003 CR4: 00000000003706e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   btrfs_wq_submit_bio+0xb3/0xd0 [btrfs]
   btrfs_submit_metadata_bio+0x44/0xc0 [btrfs]
   submit_one_bio+0x61/0x70 [btrfs]
   btree_write_cache_pages+0x414/0x450 [btrfs]
   ? kobject_put+0x9a/0x1d0
   ? trace_hardirqs_on+0x1b/0xf0
   ? _raw_spin_unlock_irqrestore+0x3c/0x60
   ? free_debug_processing+0x1e1/0x2b0
   do_writepages+0x43/0xe0
   ? lock_acquired+0x199/0x490
   __writeback_single_inode+0x59/0x650
   writeback_single_inode+0xaf/0x120
   write_inode_now+0x94/0xd0
   iput+0x187/0x2b0
   close_ctree+0x2c6/0x2fa [btrfs]
   generic_shutdown_super+0x6c/0x100
   kill_anon_super+0x14/0x30
   btrfs_kill_super+0x12/0x20 [btrfs]
   deactivate_locked_super+0x31/0x70
   cleanup_mnt+0x100/0x160
   task_work_run+0x68/0xb0
   exit_to_user_mode_prepare+0x1bb/0x1c0
   syscall_exit_to_user_mode+0x4b/0x260
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f3cfebabee7
  Code: ff 0b 00 f7 d8 64 89 01 (...)
  RSP: 002b:00007ffc9c9a05f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
  RAX: 0000000000000000 RBX: 00007f3cfecd1264 RCX: 00007f3cfebabee7
  RDX: ffffffffffffff78 RSI: 0000000000000000 RDI: 0000562b6b478000
  RBP: 0000562b6b473a30 R08: 0000000000000000 R09: 00007f3cfec6cbe0
  R10: 0000562b6b479fe0 R11: 0000000000000246 R12: 0000000000000000
  R13: 0000562b6b478000 R14: 0000562b6b473b40 R15: 0000562b6b473c60
  Modules linked in: btrfs dm_snapshot dm_thin_pool (...)
  ---[ end trace dd74718fef1ed5cc ]---

Finally when we remove the btrfs module (rmmod btrfs), there are several
warnings about objects that were allocated from our slabs but were never
freed, consequence of the transaction that was never committed and got
leaked:

  =============================================================================
  BUG btrfs_delayed_ref_head (Tainted: G    B   W        ): Objects remaining in btrfs_delayed_ref_head on __kmem_cache_shutdown()
  -----------------------------------------------------------------------------

  INFO: Slab 0x0000000094c2ae56 objects=24 used=2 fp=0x000000002bfa2521 flags=0x17fffc000010200
  CPU: 5 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   slab_err+0xb7/0xdc
   ? lock_acquired+0x199/0x490
   __kmem_cache_shutdown+0x1ac/0x3c0
   ? lock_release+0x20e/0x4c0
   kmem_cache_destroy+0x55/0x120
   btrfs_delayed_ref_exit+0x11/0x35 [btrfs]
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 f5 (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  INFO: Object 0x0000000050cbdd61 @offset=12104
  INFO: Allocated in btrfs_add_delayed_tree_ref+0xbb/0x480 [btrfs] age=1894 cpu=6 pid=1729873
	__slab_alloc.isra.0+0x109/0x1c0
	kmem_cache_alloc+0x7bb/0x830
	btrfs_add_delayed_tree_ref+0xbb/0x480 [btrfs]
	btrfs_free_tree_block+0x128/0x360 [btrfs]
	__btrfs_cow_block+0x489/0x5f0 [btrfs]
	btrfs_cow_block+0xf7/0x220 [btrfs]
	btrfs_search_slot+0x62a/0xc40 [btrfs]
	btrfs_del_orphan_item+0x65/0xd0 [btrfs]
	btrfs_find_orphan_roots+0x1bf/0x200 [btrfs]
	open_ctree+0x125a/0x18a0 [btrfs]
	btrfs_mount_root.cold+0x13/0xed [btrfs]
	legacy_get_tree+0x30/0x60
	vfs_get_tree+0x28/0xe0
	fc_mount+0xe/0x40
	vfs_kern_mount.part.0+0x71/0x90
	btrfs_mount+0x13b/0x3e0 [btrfs]
  INFO: Freed in __btrfs_run_delayed_refs+0x1117/0x1290 [btrfs] age=4292 cpu=2 pid=1729526
	kmem_cache_free+0x34c/0x3c0
	__btrfs_run_delayed_refs+0x1117/0x1290 [btrfs]
	btrfs_run_delayed_refs+0x81/0x210 [btrfs]
	commit_cowonly_roots+0xfb/0x300 [btrfs]
	btrfs_commit_transaction+0x367/0xc40 [btrfs]
	sync_filesystem+0x74/0x90
	generic_shutdown_super+0x22/0x100
	kill_anon_super+0x14/0x30
	btrfs_kill_super+0x12/0x20 [btrfs]
	deactivate_locked_super+0x31/0x70
	cleanup_mnt+0x100/0x160
	task_work_run+0x68/0xb0
	exit_to_user_mode_prepare+0x1bb/0x1c0
	syscall_exit_to_user_mode+0x4b/0x260
	entry_SYSCALL_64_after_hwframe+0x44/0xa9
  INFO: Object 0x0000000086e9b0ff @offset=12776
  INFO: Allocated in btrfs_add_delayed_tree_ref+0xbb/0x480 [btrfs] age=1900 cpu=6 pid=1729873
	__slab_alloc.isra.0+0x109/0x1c0
	kmem_cache_alloc+0x7bb/0x830
	btrfs_add_delayed_tree_ref+0xbb/0x480 [btrfs]
	btrfs_alloc_tree_block+0x2bf/0x360 [btrfs]
	alloc_tree_block_no_bg_flush+0x4f/0x60 [btrfs]
	__btrfs_cow_block+0x12d/0x5f0 [btrfs]
	btrfs_cow_block+0xf7/0x220 [btrfs]
	btrfs_search_slot+0x62a/0xc40 [btrfs]
	btrfs_del_orphan_item+0x65/0xd0 [btrfs]
	btrfs_find_orphan_roots+0x1bf/0x200 [btrfs]
	open_ctree+0x125a/0x18a0 [btrfs]
	btrfs_mount_root.cold+0x13/0xed [btrfs]
	legacy_get_tree+0x30/0x60
	vfs_get_tree+0x28/0xe0
	fc_mount+0xe/0x40
	vfs_kern_mount.part.0+0x71/0x90
  INFO: Freed in __btrfs_run_delayed_refs+0x1117/0x1290 [btrfs] age=3141 cpu=6 pid=1729803
	kmem_cache_free+0x34c/0x3c0
	__btrfs_run_delayed_refs+0x1117/0x1290 [btrfs]
	btrfs_run_delayed_refs+0x81/0x210 [btrfs]
	btrfs_write_dirty_block_groups+0x17d/0x3d0 [btrfs]
	commit_cowonly_roots+0x248/0x300 [btrfs]
	btrfs_commit_transaction+0x367/0xc40 [btrfs]
	close_ctree+0x113/0x2fa [btrfs]
	generic_shutdown_super+0x6c/0x100
	kill_anon_super+0x14/0x30
	btrfs_kill_super+0x12/0x20 [btrfs]
	deactivate_locked_super+0x31/0x70
	cleanup_mnt+0x100/0x160
	task_work_run+0x68/0xb0
	exit_to_user_mode_prepare+0x1bb/0x1c0
	syscall_exit_to_user_mode+0x4b/0x260
	entry_SYSCALL_64_after_hwframe+0x44/0xa9
  kmem_cache_destroy btrfs_delayed_ref_head: Slab cache still has objects
  CPU: 5 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   kmem_cache_destroy+0x119/0x120
   btrfs_delayed_ref_exit+0x11/0x35 [btrfs]
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 f5 0b (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  =============================================================================
  BUG btrfs_delayed_tree_ref (Tainted: G    B   W        ): Objects remaining in btrfs_delayed_tree_ref on __kmem_cache_shutdown()
  -----------------------------------------------------------------------------

  INFO: Slab 0x0000000011f78dc0 objects=37 used=2 fp=0x0000000032d55d91 flags=0x17fffc000010200
  CPU: 3 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   slab_err+0xb7/0xdc
   ? lock_acquired+0x199/0x490
   __kmem_cache_shutdown+0x1ac/0x3c0
   ? lock_release+0x20e/0x4c0
   kmem_cache_destroy+0x55/0x120
   btrfs_delayed_ref_exit+0x1d/0x35 [btrfs]
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 f5 (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  INFO: Object 0x000000001a340018 @offset=4408
  INFO: Allocated in btrfs_add_delayed_tree_ref+0x9e/0x480 [btrfs] age=1917 cpu=6 pid=1729873
	__slab_alloc.isra.0+0x109/0x1c0
	kmem_cache_alloc+0x7bb/0x830
	btrfs_add_delayed_tree_ref+0x9e/0x480 [btrfs]
	btrfs_free_tree_block+0x128/0x360 [btrfs]
	__btrfs_cow_block+0x489/0x5f0 [btrfs]
	btrfs_cow_block+0xf7/0x220 [btrfs]
	btrfs_search_slot+0x62a/0xc40 [btrfs]
	btrfs_del_orphan_item+0x65/0xd0 [btrfs]
	btrfs_find_orphan_roots+0x1bf/0x200 [btrfs]
	open_ctree+0x125a/0x18a0 [btrfs]
	btrfs_mount_root.cold+0x13/0xed [btrfs]
	legacy_get_tree+0x30/0x60
	vfs_get_tree+0x28/0xe0
	fc_mount+0xe/0x40
	vfs_kern_mount.part.0+0x71/0x90
	btrfs_mount+0x13b/0x3e0 [btrfs]
  INFO: Freed in __btrfs_run_delayed_refs+0x63d/0x1290 [btrfs] age=4167 cpu=4 pid=1729795
	kmem_cache_free+0x34c/0x3c0
	__btrfs_run_delayed_refs+0x63d/0x1290 [btrfs]
	btrfs_run_delayed_refs+0x81/0x210 [btrfs]
	btrfs_commit_transaction+0x60/0xc40 [btrfs]
	create_subvol+0x56a/0x990 [btrfs]
	btrfs_mksubvol+0x3fb/0x4a0 [btrfs]
	__btrfs_ioctl_snap_create+0x119/0x1a0 [btrfs]
	btrfs_ioctl_snap_create+0x58/0x80 [btrfs]
	btrfs_ioctl+0x1a92/0x36f0 [btrfs]
	__x64_sys_ioctl+0x83/0xb0
	do_syscall_64+0x33/0x80
	entry_SYSCALL_64_after_hwframe+0x44/0xa9
  INFO: Object 0x000000002b46292a @offset=13648
  INFO: Allocated in btrfs_add_delayed_tree_ref+0x9e/0x480 [btrfs] age=1923 cpu=6 pid=1729873
	__slab_alloc.isra.0+0x109/0x1c0
	kmem_cache_alloc+0x7bb/0x830
	btrfs_add_delayed_tree_ref+0x9e/0x480 [btrfs]
	btrfs_alloc_tree_block+0x2bf/0x360 [btrfs]
	alloc_tree_block_no_bg_flush+0x4f/0x60 [btrfs]
	__btrfs_cow_block+0x12d/0x5f0 [btrfs]
	btrfs_cow_block+0xf7/0x220 [btrfs]
	btrfs_search_slot+0x62a/0xc40 [btrfs]
	btrfs_del_orphan_item+0x65/0xd0 [btrfs]
	btrfs_find_orphan_roots+0x1bf/0x200 [btrfs]
	open_ctree+0x125a/0x18a0 [btrfs]
	btrfs_mount_root.cold+0x13/0xed [btrfs]
	legacy_get_tree+0x30/0x60
	vfs_get_tree+0x28/0xe0
	fc_mount+0xe/0x40
	vfs_kern_mount.part.0+0x71/0x90
  INFO: Freed in __btrfs_run_delayed_refs+0x63d/0x1290 [btrfs] age=3164 cpu=6 pid=1729803
	kmem_cache_free+0x34c/0x3c0
	__btrfs_run_delayed_refs+0x63d/0x1290 [btrfs]
	btrfs_run_delayed_refs+0x81/0x210 [btrfs]
	commit_cowonly_roots+0xfb/0x300 [btrfs]
	btrfs_commit_transaction+0x367/0xc40 [btrfs]
	close_ctree+0x113/0x2fa [btrfs]
	generic_shutdown_super+0x6c/0x100
	kill_anon_super+0x14/0x30
	btrfs_kill_super+0x12/0x20 [btrfs]
	deactivate_locked_super+0x31/0x70
	cleanup_mnt+0x100/0x160
	task_work_run+0x68/0xb0
	exit_to_user_mode_prepare+0x1bb/0x1c0
	syscall_exit_to_user_mode+0x4b/0x260
	entry_SYSCALL_64_after_hwframe+0x44/0xa9
  kmem_cache_destroy btrfs_delayed_tree_ref: Slab cache still has objects
  CPU: 5 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   kmem_cache_destroy+0x119/0x120
   btrfs_delayed_ref_exit+0x1d/0x35 [btrfs]
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 f5 (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  =============================================================================
  BUG btrfs_delayed_extent_op (Tainted: G    B   W        ): Objects remaining in btrfs_delayed_extent_op on __kmem_cache_shutdown()
  -----------------------------------------------------------------------------

  INFO: Slab 0x00000000f145ce2f objects=22 used=1 fp=0x00000000af0f92cf flags=0x17fffc000010200
  CPU: 5 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   slab_err+0xb7/0xdc
   ? lock_acquired+0x199/0x490
   __kmem_cache_shutdown+0x1ac/0x3c0
   ? __mutex_unlock_slowpath+0x45/0x2a0
   kmem_cache_destroy+0x55/0x120
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 f5 (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  INFO: Object 0x000000004cf95ea8 @offset=6264
  INFO: Allocated in btrfs_alloc_tree_block+0x1e0/0x360 [btrfs] age=1931 cpu=6 pid=1729873
	__slab_alloc.isra.0+0x109/0x1c0
	kmem_cache_alloc+0x7bb/0x830
	btrfs_alloc_tree_block+0x1e0/0x360 [btrfs]
	alloc_tree_block_no_bg_flush+0x4f/0x60 [btrfs]
	__btrfs_cow_block+0x12d/0x5f0 [btrfs]
	btrfs_cow_block+0xf7/0x220 [btrfs]
	btrfs_search_slot+0x62a/0xc40 [btrfs]
	btrfs_del_orphan_item+0x65/0xd0 [btrfs]
	btrfs_find_orphan_roots+0x1bf/0x200 [btrfs]
	open_ctree+0x125a/0x18a0 [btrfs]
	btrfs_mount_root.cold+0x13/0xed [btrfs]
	legacy_get_tree+0x30/0x60
	vfs_get_tree+0x28/0xe0
	fc_mount+0xe/0x40
	vfs_kern_mount.part.0+0x71/0x90
	btrfs_mount+0x13b/0x3e0 [btrfs]
  INFO: Freed in __btrfs_run_delayed_refs+0xabd/0x1290 [btrfs] age=3173 cpu=6 pid=1729803
	kmem_cache_free+0x34c/0x3c0
	__btrfs_run_delayed_refs+0xabd/0x1290 [btrfs]
	btrfs_run_delayed_refs+0x81/0x210 [btrfs]
	commit_cowonly_roots+0xfb/0x300 [btrfs]
	btrfs_commit_transaction+0x367/0xc40 [btrfs]
	close_ctree+0x113/0x2fa [btrfs]
	generic_shutdown_super+0x6c/0x100
	kill_anon_super+0x14/0x30
	btrfs_kill_super+0x12/0x20 [btrfs]
	deactivate_locked_super+0x31/0x70
	cleanup_mnt+0x100/0x160
	task_work_run+0x68/0xb0
	exit_to_user_mode_prepare+0x1bb/0x1c0
	syscall_exit_to_user_mode+0x4b/0x260
	entry_SYSCALL_64_after_hwframe+0x44/0xa9
  kmem_cache_destroy btrfs_delayed_extent_op: Slab cache still has objects
  CPU: 3 PID: 1729921 Comm: rmmod Tainted: G    B   W         5.10.0-rc4-btrfs-next-73 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   dump_stack+0x8d/0xb5
   kmem_cache_destroy+0x119/0x120
   exit_btrfs_fs+0xa/0x59 [btrfs]
   __x64_sys_delete_module+0x194/0x260
   ? fpregs_assert_state_consistent+0x1e/0x40
   ? exit_to_user_mode_prepare+0x55/0x1c0
   ? trace_hardirqs_on+0x1b/0xf0
   do_syscall_64+0x33/0x80
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f693e305897
  Code: 73 01 c3 48 8b 0d f9 (...)
  RSP: 002b:00007ffcf73eb508 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
  RAX: ffffffffffffffda RBX: 0000559df504f760 RCX: 00007f693e305897
  RDX: 000000000000000a RSI: 0000000000000800 RDI: 0000559df504f7c8
  RBP: 00007ffcf73eb568 R08: 0000000000000000 R09: 0000000000000000
  R10: 00007f693e378ac0 R11: 0000000000000206 R12: 00007ffcf73eb740
  R13: 00007ffcf73ec5a6 R14: 0000559df504f2a0 R15: 0000559df504f760
  BTRFS: state leak: start 30408704 end 30425087 state 1 in tree 1 refs 1

Fix this issue by having the remount path stop the qgroup rescan worker
when we are remounting RO and teach the rescan worker to stop when a
remount is in progress. If later a remount in RW mode happens, we are
already resuming the qgroup rescan worker through the call to
btrfs_qgroup_rescan_resume(), so we do not need to worry about that.

Tested-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@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>
 		2021-01-19 18:26:14 +01:00
..
9p 9P: Cast to loff_t before multiplying 2020-11-05 11:43:34 +01:00
adfs Merge branch 'work.adfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 11:33:22 -07:00
affs affs: fix basic permission bits to actually work 2020-09-09 19:12:34 +02:00
afs afs: Fix memory leak when mounting with multiple source parameters 2020-12-30 11:50:54 +01:00
autofs autofs: fix a leak in autofs_expire_indirect() 2019-10-25 00:03:11 -04:00
befs fs: Fill in max and min timestamps in superblock 2019-08-30 07:27:17 -07:00
bfs bfs: don't use WARNING: string when it's just info. 2021-01-06 14:48:39 +01:00
btrfs btrfs: fix transaction leak and crash after RO remount caused by qgroup rescan 2021-01-19 18:26:14 +01:00
cachefiles cachefiles: Handle readpage error correctly 2020-11-05 11:43:36 +01:00
ceph ceph: fix race in concurrent __ceph_remove_cap invocations 2020-12-30 11:51:40 +01:00
cifs cifs: fix interrupted close commands 2021-01-19 18:26:13 +01:00
coda y2038: add inode timestamp clamping 2019-09-19 09:42:37 -07:00
configfs configfs: fix config_item refcnt leak in configfs_rmdir() 2020-05-27 17:46:30 +02:00
cramfs cramfs: fix usage on non-MTD device 2019-11-23 21:44:49 -05:00
crypto fscrypt: remove kernel-internal constants from UAPI header 2021-01-06 14:48:35 +01:00
debugfs debugfs: Fix module state check condition 2020-09-17 13:47:55 +02:00
devpts devpts_pty_kill(): don't bother with d_delete() 2019-09-03 09:30:56 -04:00
dlm fs: dlm: fix configfs memory leak 2020-10-29 09:58:03 +01:00
ecryptfs ecryptfs: replace BUG_ON with error handling code 2020-02-28 17:22:26 +01:00
efivarfs efivarfs: revert "fix memory leak in efivarfs_create()" 2020-12-02 08:49:53 +01:00
efs fs: Fill in max and min timestamps in superblock 2019-08-30 07:27:17 -07:00
erofs erofs: avoid using generic_block_bmap 2020-12-30 11:51:23 +01:00
exportfs exportfs_decode_fh(): negative pinned may become positive without the parent locked 2019-11-10 11:56:05 -05:00
ext2 ext2: don't update mtime on COW faults 2020-09-09 19:12:30 +02:00
ext4 ext4: don't leak old mountpoint samples 2021-01-19 18:26:13 +01:00
f2fs f2fs: avoid race condition for shrinker count 2021-01-06 14:48:40 +01:00
fat fat: don't allow to mount if the FAT length == 0 2020-06-17 16:40:36 +02:00
freevxfs fs: Fill in max and min timestamps in superblock 2019-08-30 07:27:17 -07:00
fscache Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
fuse fuse: fix bad inode 2021-01-09 13:44:54 +01:00
gfs2 gfs2: check for empty rgrp tree in gfs2_ri_update 2020-12-11 13:23:32 +01:00
hfs treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
hfsplus hfsplus: fix crash and filesystem corruption when deleting files 2020-04-17 10:50:22 +02:00
hostfs This pull request contains the following changes for UML: 2019-05-12 17:52:13 -04:00
hpfs fs: hpfs: Initialize filesystem timestamp ranges 2019-08-30 08:11:25 -07:00
hugetlbfs hugetlbfs: prevent filesystem stacking of hugetlbfs 2020-09-03 11:26:48 +02:00
iomap iomap: fix WARN_ON_ONCE() from unprivileged users 2020-10-29 09:58:06 +01:00
isofs y2038: add inode timestamp clamping 2019-09-19 09:42:37 -07:00
jbd2 jbd2: fix up sparse warnings in checkpoint code 2020-11-18 19:20:30 +01:00
jffs2 jffs2: Fix NULL pointer dereference in rp_size fs option parsing 2021-01-06 14:48:37 +01:00
jfs jfs: Fix array index bounds check in dbAdjTree 2020-12-30 11:51:40 +01:00
kernfs kernfs: do not call fsnotify() with name without a parent 2020-08-19 08:16:12 +02:00
lockd lockd: don't use interval-based rebinding over TCP 2020-12-30 11:51:16 +01:00
minix fs/minix: remove expected error message in block_to_path() 2020-08-21 13:05:37 +02:00
nfs NFSv4: Fix a pNFS layout related use-after-free race when freeing the inode 2021-01-06 14:48:40 +01:00
nfs_common nfs_common: need lock during iterate through the list 2020-12-30 11:51:22 +01:00
nfsd nfsd: Fix message level for normal termination 2020-12-30 11:51:22 +01:00
nilfs2 nilfs2: fix null pointer dereference at nilfs_segctor_do_construct() 2020-06-17 16:40:29 +02:00
nls treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
notify fanotify: fix ignore mask logic for events on child and on dir 2020-06-17 16:40:24 +02:00
ntfs ntfs: add check for mft record size in superblock 2020-10-29 09:58:03 +01:00
ocfs2 ocfs2: initialize ip_next_orphan 2020-11-18 19:20:30 +01:00
omfs fs: omfs: Initialize filesystem timestamp ranges 2019-08-30 08:11:25 -07:00
openpromfs Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
orangefs orangefs: get rid of knob code... 2020-08-21 13:05:29 +02:00
overlayfs ovl: fix unneeded call to ovl_change_flags() 2020-07-22 09:33:12 +02:00
proc proc: fix lookup in /proc/net subdirectories after setns(2) 2021-01-12 20:16:10 +01:00
pstore pstore: Fix linking when crypto API disabled 2020-08-19 08:16:27 +02:00
qnx4 fs: Fill in max and min timestamps in superblock 2019-08-30 07:27:17 -07:00
qnx6 fs: Fill in max and min timestamps in superblock 2019-08-30 07:27:17 -07:00
quota quota: Don't overflow quota file offsets 2021-01-06 14:48:39 +01:00
ramfs ramfs: fix nommu mmap with gaps in the page cache 2020-10-29 09:57:53 +01:00
reiserfs reiserfs: add check for an invalid ih_entry_count 2021-01-06 14:48:38 +01:00
romfs romfs: fix uninitialized memory leak in romfs_dev_read() 2020-08-26 10:40:51 +02:00
squashfs Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-09-19 10:06:57 -07:00
sysfs Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
sysv fs: sysv: Initialize filesystem timestamp ranges 2019-08-30 07:27:18 -07:00
tracefs tracing: Do not create tracefs files if tracefs lockdown is in effect 2019-10-12 20:49:07 -04:00
ubifs ubifs: prevent creating duplicate encrypted filenames 2021-01-06 14:48:35 +01:00
udf udf: Fix memory leak when mounting 2020-11-05 11:43:29 +01:00
ufs fs/ufs: avoid potential u32 multiplication overflow 2020-08-21 13:05:37 +02:00
unicode unicode: make array 'token' static const, makes object smaller 2019-09-17 11:48:24 -04:00
verity fs-verity: support builtin file signatures 2019-08-12 19:33:50 -07:00
xfs xfs: revert "xfs: fix rmap key and record comparison functions" 2020-11-24 13:29:18 +01:00
Kconfig fs-verity for 5.4 2019-09-18 16:59:14 -07:00
Kconfig.binfmt binfmt_flat: make support for old format binaries optional 2019-06-24 09:16:47 +10:00
Makefile fs-verity for 5.4 2019-09-18 16:59:14 -07:00
aio.c aio: fix async fsync creds 2020-06-17 16:40:24 +02:00
anon_inodes.c Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
attr.c utimes: Clamp the timestamps in notify_change() 2020-02-11 04:35:12 -08:00
bad_inode.c
…
binfmt_aout.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
binfmt_elf.c fs/binfmt_elf.c: allocate initialized memory in fill_thread_core_info() 2020-06-03 08:21:27 +02:00
binfmt_elf_fdpic.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
binfmt_em86.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
binfmt_flat.c binfmt_flat: revert "binfmt_flat: don't offset the data start" 2020-09-03 11:26:39 +02:00
binfmt_misc.c Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
binfmt_script.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
block_dev.c bdev: Reduce time holding bd_mutex in sync in blkdev_close() 2020-10-01 13:17:55 +02:00
buffer.c fs: Don't invalidate page buffers in block_write_full_page() 2020-11-05 11:43:24 +01:00
char_dev.c chardev: Avoid potential use-after-free in 'chrdev_open()' 2020-01-14 20:08:18 +01:00
compat.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
compat_binfmt_elf.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193 2019-05-30 11:29:21 -07:00
compat_ioctl.c fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP 2020-01-09 10:20:05 +01:00
coredump.c coredump: fix core_pattern parse error 2020-12-11 13:23:30 +01:00
d_path.c fs: fix NULL dereference due to data race in prepend_path() 2020-10-29 09:57:45 +01:00
dax.c dax: pass NOWAIT flag to iomap_apply 2020-03-05 16:43:36 +01:00
dcache.c fix dget_parent() fastpath race 2020-10-01 13:17:19 +02:00
dcookies.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
direct-io.c fs/direct-io.c: fix kernel-doc warning 2019-10-14 15:04:01 -07:00
drop_caches.c fs: avoid softlockups in s_inodes iterators 2020-01-12 12:21:37 +01:00
eventfd.c eventfd: track eventfd_signal() recursion depth 2020-02-11 04:35:37 -08:00
eventpoll.c ep_create_wakeup_source(): dentry name can change under you... 2020-10-07 08:01:31 +02:00
exec.c exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:44:55 +01:00
fcntl.c fcntl: Fix potential deadlock in send_sig{io, urg}() 2021-01-06 14:48:39 +01:00
fhandle.c fs/handle.c - fix up kerneldoc 2019-08-07 21:51:47 -04:00
file.c fix multiplication overflow in copy_fdtable() 2020-05-27 17:46:12 +02:00
file_table.c vfs: Export flush_delayed_fput for use by knfsd. 2019-08-19 11:00:39 -04:00
filesystems.c fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once() 2020-04-17 10:50:21 +02:00
fs-writeback.c writeback: Fix sync livelock due to b_dirty_time processing 2020-09-03 11:27:04 +02:00
fs_context.c vfs: subtype handling moved to fuse 2019-09-06 21:28:49 +02:00
fs_parser.c vfs: Make fs_parse() handle fs_param_is_fd-type params better 2019-09-12 21:06:14 -04:00
fs_pin.c switch the remnants of releasing the mountpoint away from fs_pin 2019-07-16 22:52:37 -04:00
fs_struct.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
fs_types.c
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fsopen.c Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
inode.c futex: Fix inode life-time issue 2020-03-25 08:25:58 +01:00
internal.h fs: move guard_bio_eod() after bio_set_op_attrs 2020-01-17 19:48:21 +01:00
io_uring.c io_uring: Fix double list add in io_queue_async_work() 2020-10-14 10:32:57 +02:00
ioctl.c compat_ioctl: add compat_ptr_ioctl() 2019-12-17 19:55:30 +01:00
libfs.c libfs: fix error cast of negative value in simple_attr_write() 2020-11-24 13:29:19 +01:00
locks.c locks: reinstate locks_delete_block optimization 2020-03-25 08:25:41 +01:00
mbcache.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
mount.h switch the remnants of releasing the mountpoint away from fs_pin 2019-07-16 22:52:37 -04:00
mpage.c fs: move guard_bio_eod() after bio_set_op_attrs 2020-01-17 19:48:21 +01:00
namei.c namei: only return -ECHILD from follow_dotdot_rcu() 2020-03-05 16:43:48 +01:00
namespace.c fs/namespace.c: WARN if mnt_count has become negative 2021-01-06 14:48:40 +01:00
no-block.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nsfs.c vfs: Convert nsfs to use the new mount API 2019-05-25 18:00:06 -04:00
open.c cifs_atomic_open(): fix double-put on late allocation failure 2020-03-18 07:17:51 +01:00
pipe.c vfs: Convert pipe to use the new mount API 2019-05-25 18:00:07 -04:00
pnode.c propagate_one(): mnt_set_mountpoint() needs mount_lock 2020-05-02 08:48:44 +02:00
pnode.h fs/namespace.c: WARN if mnt_count has become negative 2021-01-06 14:48:40 +01:00
posix_acl.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
proc_namespace.c vfs: subtype handling moved to fuse 2019-09-06 21:28:49 +02:00
read_write.c fs: allow deduplication of eof block into the end of the destination file 2020-02-11 04:35:23 -08:00
readdir.c readdir: be more conservative with directory entry names 2020-01-29 16:45:31 +01:00
select.c fs/select.c: use struct_size() in kmalloc() 2019-07-16 19:23:25 -07:00
seq_file.c seq_file: fix problem when seeking mid-record 2019-08-13 16:06:52 -07:00
signalfd.c fs/signalfd.c: fix inconsistent return codes for signalfd4 2020-08-26 10:40:58 +02:00
splice.c splice: only read in as much information as there is pipe buffer space 2019-12-17 19:56:52 +01:00
stack.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
stat.c
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statfs.c vfs: Fix EOVERFLOW testing in put_compat_statfs64 2019-10-03 14:21:35 -07:00
super.c vfs: remove lockdep bogosity in __sb_start_write 2020-11-24 13:29:01 +01:00
sync.c fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback 2019-05-14 09:47:50 -07:00
timerfd.c timerfd: Prepare for PREEMPT_RT 2019-08-01 20:51:23 +02:00
userfaultfd.c userfaultfd: require CAP_SYS_PTRACE for UFFD_FEATURE_EVENT_FORK 2020-01-04 19:18:32 +01:00
utimes.c utimes: Clamp the timestamps in notify_change() 2020-02-11 04:35:12 -08:00
xattr.c xattr: break delegations in {set,remove}xattr 2020-08-11 15:33:39 +02:00