forked from luck/tmp_suning_uos_patched
29543864c8
[ Upstream commit cb13eea3b49055bd78e6ddf39defd6340f7379fc ] 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>
2604 lines
69 KiB
C
2604 lines
69 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/blkdev.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/backing-dev.h>
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#include <linux/mount.h>
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#include <linux/writeback.h>
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#include <linux/statfs.h>
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#include <linux/compat.h>
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#include <linux/parser.h>
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#include <linux/ctype.h>
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#include <linux/namei.h>
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#include <linux/miscdevice.h>
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#include <linux/magic.h>
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#include <linux/slab.h>
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#include <linux/cleancache.h>
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#include <linux/ratelimit.h>
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#include <linux/crc32c.h>
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#include <linux/btrfs.h>
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#include "delayed-inode.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "print-tree.h"
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#include "props.h"
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#include "xattr.h"
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#include "volumes.h"
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#include "export.h"
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#include "compression.h"
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#include "rcu-string.h"
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#include "dev-replace.h"
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#include "free-space-cache.h"
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#include "backref.h"
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#include "space-info.h"
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#include "sysfs.h"
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#include "tests/btrfs-tests.h"
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#include "block-group.h"
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#include "discard.h"
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#include "qgroup.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/btrfs.h>
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static const struct super_operations btrfs_super_ops;
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/*
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* Types for mounting the default subvolume and a subvolume explicitly
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* requested by subvol=/path. That way the callchain is straightforward and we
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* don't have to play tricks with the mount options and recursive calls to
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* btrfs_mount.
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*
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* The new btrfs_root_fs_type also servers as a tag for the bdev_holder.
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*/
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static struct file_system_type btrfs_fs_type;
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static struct file_system_type btrfs_root_fs_type;
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static int btrfs_remount(struct super_block *sb, int *flags, char *data);
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/*
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* Generally the error codes correspond to their respective errors, but there
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* are a few special cases.
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*
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* EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
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* instance will return EUCLEAN if any of the blocks are corrupted in
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* a way that is problematic. We want to reserve EUCLEAN for these
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* sort of corruptions.
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*
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* EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
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* need to use EROFS for this case. We will have no idea of the
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* original failure, that will have been reported at the time we tripped
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* over the error. Each subsequent error that doesn't have any context
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* of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
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*/
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const char * __attribute_const__ btrfs_decode_error(int errno)
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{
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char *errstr = "unknown";
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switch (errno) {
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case -ENOENT: /* -2 */
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errstr = "No such entry";
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break;
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case -EIO: /* -5 */
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errstr = "IO failure";
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break;
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case -ENOMEM: /* -12*/
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errstr = "Out of memory";
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break;
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case -EEXIST: /* -17 */
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errstr = "Object already exists";
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break;
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case -ENOSPC: /* -28 */
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|
errstr = "No space left";
|
|
break;
|
|
case -EROFS: /* -30 */
|
|
errstr = "Readonly filesystem";
|
|
break;
|
|
case -EOPNOTSUPP: /* -95 */
|
|
errstr = "Operation not supported";
|
|
break;
|
|
case -EUCLEAN: /* -117 */
|
|
errstr = "Filesystem corrupted";
|
|
break;
|
|
case -EDQUOT: /* -122 */
|
|
errstr = "Quota exceeded";
|
|
break;
|
|
}
|
|
|
|
return errstr;
|
|
}
|
|
|
|
/*
|
|
* __btrfs_handle_fs_error decodes expected errors from the caller and
|
|
* invokes the appropriate error response.
|
|
*/
|
|
__cold
|
|
void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
|
|
unsigned int line, int errno, const char *fmt, ...)
|
|
{
|
|
struct super_block *sb = fs_info->sb;
|
|
#ifdef CONFIG_PRINTK
|
|
const char *errstr;
|
|
#endif
|
|
|
|
/*
|
|
* Special case: if the error is EROFS, and we're already
|
|
* under SB_RDONLY, then it is safe here.
|
|
*/
|
|
if (errno == -EROFS && sb_rdonly(sb))
|
|
return;
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
errstr = btrfs_decode_error(errno);
|
|
if (fmt) {
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n",
|
|
sb->s_id, function, line, errno, errstr, &vaf);
|
|
va_end(args);
|
|
} else {
|
|
pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
|
|
sb->s_id, function, line, errno, errstr);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Today we only save the error info to memory. Long term we'll
|
|
* also send it down to the disk
|
|
*/
|
|
set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
|
|
|
|
/* Don't go through full error handling during mount */
|
|
if (!(sb->s_flags & SB_BORN))
|
|
return;
|
|
|
|
if (sb_rdonly(sb))
|
|
return;
|
|
|
|
btrfs_discard_stop(fs_info);
|
|
|
|
/* btrfs handle error by forcing the filesystem readonly */
|
|
sb->s_flags |= SB_RDONLY;
|
|
btrfs_info(fs_info, "forced readonly");
|
|
/*
|
|
* Note that a running device replace operation is not canceled here
|
|
* although there is no way to update the progress. It would add the
|
|
* risk of a deadlock, therefore the canceling is omitted. The only
|
|
* penalty is that some I/O remains active until the procedure
|
|
* completes. The next time when the filesystem is mounted writable
|
|
* again, the device replace operation continues.
|
|
*/
|
|
}
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
static const char * const logtypes[] = {
|
|
"emergency",
|
|
"alert",
|
|
"critical",
|
|
"error",
|
|
"warning",
|
|
"notice",
|
|
"info",
|
|
"debug",
|
|
};
|
|
|
|
|
|
/*
|
|
* Use one ratelimit state per log level so that a flood of less important
|
|
* messages doesn't cause more important ones to be dropped.
|
|
*/
|
|
static struct ratelimit_state printk_limits[] = {
|
|
RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
|
|
};
|
|
|
|
void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
|
|
{
|
|
char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
|
|
struct va_format vaf;
|
|
va_list args;
|
|
int kern_level;
|
|
const char *type = logtypes[4];
|
|
struct ratelimit_state *ratelimit = &printk_limits[4];
|
|
|
|
va_start(args, fmt);
|
|
|
|
while ((kern_level = printk_get_level(fmt)) != 0) {
|
|
size_t size = printk_skip_level(fmt) - fmt;
|
|
|
|
if (kern_level >= '0' && kern_level <= '7') {
|
|
memcpy(lvl, fmt, size);
|
|
lvl[size] = '\0';
|
|
type = logtypes[kern_level - '0'];
|
|
ratelimit = &printk_limits[kern_level - '0'];
|
|
}
|
|
fmt += size;
|
|
}
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
if (__ratelimit(ratelimit))
|
|
printk("%sBTRFS %s (device %s): %pV\n", lvl, type,
|
|
fs_info ? fs_info->sb->s_id : "<unknown>", &vaf);
|
|
|
|
va_end(args);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We only mark the transaction aborted and then set the file system read-only.
|
|
* This will prevent new transactions from starting or trying to join this
|
|
* one.
|
|
*
|
|
* This means that error recovery at the call site is limited to freeing
|
|
* any local memory allocations and passing the error code up without
|
|
* further cleanup. The transaction should complete as it normally would
|
|
* in the call path but will return -EIO.
|
|
*
|
|
* We'll complete the cleanup in btrfs_end_transaction and
|
|
* btrfs_commit_transaction.
|
|
*/
|
|
__cold
|
|
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
|
|
const char *function,
|
|
unsigned int line, int errno)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
|
|
WRITE_ONCE(trans->aborted, errno);
|
|
/* Nothing used. The other threads that have joined this
|
|
* transaction may be able to continue. */
|
|
if (!trans->dirty && list_empty(&trans->new_bgs)) {
|
|
const char *errstr;
|
|
|
|
errstr = btrfs_decode_error(errno);
|
|
btrfs_warn(fs_info,
|
|
"%s:%d: Aborting unused transaction(%s).",
|
|
function, line, errstr);
|
|
return;
|
|
}
|
|
WRITE_ONCE(trans->transaction->aborted, errno);
|
|
/* Wake up anybody who may be waiting on this transaction */
|
|
wake_up(&fs_info->transaction_wait);
|
|
wake_up(&fs_info->transaction_blocked_wait);
|
|
__btrfs_handle_fs_error(fs_info, function, line, errno, NULL);
|
|
}
|
|
/*
|
|
* __btrfs_panic decodes unexpected, fatal errors from the caller,
|
|
* issues an alert, and either panics or BUGs, depending on mount options.
|
|
*/
|
|
__cold
|
|
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
|
|
unsigned int line, int errno, const char *fmt, ...)
|
|
{
|
|
char *s_id = "<unknown>";
|
|
const char *errstr;
|
|
struct va_format vaf = { .fmt = fmt };
|
|
va_list args;
|
|
|
|
if (fs_info)
|
|
s_id = fs_info->sb->s_id;
|
|
|
|
va_start(args, fmt);
|
|
vaf.va = &args;
|
|
|
|
errstr = btrfs_decode_error(errno);
|
|
if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
|
|
panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
|
|
s_id, function, line, &vaf, errno, errstr);
|
|
|
|
btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
|
|
function, line, &vaf, errno, errstr);
|
|
va_end(args);
|
|
/* Caller calls BUG() */
|
|
}
|
|
|
|
static void btrfs_put_super(struct super_block *sb)
|
|
{
|
|
close_ctree(btrfs_sb(sb));
|
|
}
|
|
|
|
enum {
|
|
Opt_acl, Opt_noacl,
|
|
Opt_clear_cache,
|
|
Opt_commit_interval,
|
|
Opt_compress,
|
|
Opt_compress_force,
|
|
Opt_compress_force_type,
|
|
Opt_compress_type,
|
|
Opt_degraded,
|
|
Opt_device,
|
|
Opt_fatal_errors,
|
|
Opt_flushoncommit, Opt_noflushoncommit,
|
|
Opt_inode_cache, Opt_noinode_cache,
|
|
Opt_max_inline,
|
|
Opt_barrier, Opt_nobarrier,
|
|
Opt_datacow, Opt_nodatacow,
|
|
Opt_datasum, Opt_nodatasum,
|
|
Opt_defrag, Opt_nodefrag,
|
|
Opt_discard, Opt_nodiscard,
|
|
Opt_discard_mode,
|
|
Opt_norecovery,
|
|
Opt_ratio,
|
|
Opt_rescan_uuid_tree,
|
|
Opt_skip_balance,
|
|
Opt_space_cache, Opt_no_space_cache,
|
|
Opt_space_cache_version,
|
|
Opt_ssd, Opt_nossd,
|
|
Opt_ssd_spread, Opt_nossd_spread,
|
|
Opt_subvol,
|
|
Opt_subvol_empty,
|
|
Opt_subvolid,
|
|
Opt_thread_pool,
|
|
Opt_treelog, Opt_notreelog,
|
|
Opt_user_subvol_rm_allowed,
|
|
|
|
/* Rescue options */
|
|
Opt_rescue,
|
|
Opt_usebackuproot,
|
|
Opt_nologreplay,
|
|
|
|
/* Deprecated options */
|
|
Opt_recovery,
|
|
|
|
/* Debugging options */
|
|
Opt_check_integrity,
|
|
Opt_check_integrity_including_extent_data,
|
|
Opt_check_integrity_print_mask,
|
|
Opt_enospc_debug, Opt_noenospc_debug,
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
|
|
Opt_ref_verify,
|
|
#endif
|
|
Opt_err,
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{Opt_acl, "acl"},
|
|
{Opt_noacl, "noacl"},
|
|
{Opt_clear_cache, "clear_cache"},
|
|
{Opt_commit_interval, "commit=%u"},
|
|
{Opt_compress, "compress"},
|
|
{Opt_compress_type, "compress=%s"},
|
|
{Opt_compress_force, "compress-force"},
|
|
{Opt_compress_force_type, "compress-force=%s"},
|
|
{Opt_degraded, "degraded"},
|
|
{Opt_device, "device=%s"},
|
|
{Opt_fatal_errors, "fatal_errors=%s"},
|
|
{Opt_flushoncommit, "flushoncommit"},
|
|
{Opt_noflushoncommit, "noflushoncommit"},
|
|
{Opt_inode_cache, "inode_cache"},
|
|
{Opt_noinode_cache, "noinode_cache"},
|
|
{Opt_max_inline, "max_inline=%s"},
|
|
{Opt_barrier, "barrier"},
|
|
{Opt_nobarrier, "nobarrier"},
|
|
{Opt_datacow, "datacow"},
|
|
{Opt_nodatacow, "nodatacow"},
|
|
{Opt_datasum, "datasum"},
|
|
{Opt_nodatasum, "nodatasum"},
|
|
{Opt_defrag, "autodefrag"},
|
|
{Opt_nodefrag, "noautodefrag"},
|
|
{Opt_discard, "discard"},
|
|
{Opt_discard_mode, "discard=%s"},
|
|
{Opt_nodiscard, "nodiscard"},
|
|
{Opt_norecovery, "norecovery"},
|
|
{Opt_ratio, "metadata_ratio=%u"},
|
|
{Opt_rescan_uuid_tree, "rescan_uuid_tree"},
|
|
{Opt_skip_balance, "skip_balance"},
|
|
{Opt_space_cache, "space_cache"},
|
|
{Opt_no_space_cache, "nospace_cache"},
|
|
{Opt_space_cache_version, "space_cache=%s"},
|
|
{Opt_ssd, "ssd"},
|
|
{Opt_nossd, "nossd"},
|
|
{Opt_ssd_spread, "ssd_spread"},
|
|
{Opt_nossd_spread, "nossd_spread"},
|
|
{Opt_subvol, "subvol=%s"},
|
|
{Opt_subvol_empty, "subvol="},
|
|
{Opt_subvolid, "subvolid=%s"},
|
|
{Opt_thread_pool, "thread_pool=%u"},
|
|
{Opt_treelog, "treelog"},
|
|
{Opt_notreelog, "notreelog"},
|
|
{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
|
|
|
|
/* Rescue options */
|
|
{Opt_rescue, "rescue=%s"},
|
|
/* Deprecated, with alias rescue=nologreplay */
|
|
{Opt_nologreplay, "nologreplay"},
|
|
/* Deprecated, with alias rescue=usebackuproot */
|
|
{Opt_usebackuproot, "usebackuproot"},
|
|
|
|
/* Deprecated options */
|
|
{Opt_recovery, "recovery"},
|
|
|
|
/* Debugging options */
|
|
{Opt_check_integrity, "check_int"},
|
|
{Opt_check_integrity_including_extent_data, "check_int_data"},
|
|
{Opt_check_integrity_print_mask, "check_int_print_mask=%u"},
|
|
{Opt_enospc_debug, "enospc_debug"},
|
|
{Opt_noenospc_debug, "noenospc_debug"},
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
{Opt_fragment_data, "fragment=data"},
|
|
{Opt_fragment_metadata, "fragment=metadata"},
|
|
{Opt_fragment_all, "fragment=all"},
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
|
|
{Opt_ref_verify, "ref_verify"},
|
|
#endif
|
|
{Opt_err, NULL},
|
|
};
|
|
|
|
static const match_table_t rescue_tokens = {
|
|
{Opt_usebackuproot, "usebackuproot"},
|
|
{Opt_nologreplay, "nologreplay"},
|
|
{Opt_err, NULL},
|
|
};
|
|
|
|
static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
|
|
{
|
|
char *opts;
|
|
char *orig;
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int ret = 0;
|
|
|
|
opts = kstrdup(options, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
orig = opts;
|
|
|
|
while ((p = strsep(&opts, ":")) != NULL) {
|
|
int token;
|
|
|
|
if (!*p)
|
|
continue;
|
|
token = match_token(p, rescue_tokens, args);
|
|
switch (token){
|
|
case Opt_usebackuproot:
|
|
btrfs_info(info,
|
|
"trying to use backup root at mount time");
|
|
btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
|
|
break;
|
|
case Opt_nologreplay:
|
|
btrfs_set_and_info(info, NOLOGREPLAY,
|
|
"disabling log replay at mount time");
|
|
break;
|
|
case Opt_err:
|
|
btrfs_info(info, "unrecognized rescue option '%s'", p);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
}
|
|
out:
|
|
kfree(orig);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Regular mount options parser. Everything that is needed only when
|
|
* reading in a new superblock is parsed here.
|
|
* XXX JDM: This needs to be cleaned up for remount.
|
|
*/
|
|
int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
|
|
unsigned long new_flags)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
char *p, *num;
|
|
u64 cache_gen;
|
|
int intarg;
|
|
int ret = 0;
|
|
char *compress_type;
|
|
bool compress_force = false;
|
|
enum btrfs_compression_type saved_compress_type;
|
|
int saved_compress_level;
|
|
bool saved_compress_force;
|
|
int no_compress = 0;
|
|
|
|
cache_gen = btrfs_super_cache_generation(info->super_copy);
|
|
if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
|
|
btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
|
|
else if (cache_gen)
|
|
btrfs_set_opt(info->mount_opt, SPACE_CACHE);
|
|
|
|
/*
|
|
* Even the options are empty, we still need to do extra check
|
|
* against new flags
|
|
*/
|
|
if (!options)
|
|
goto check;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_degraded:
|
|
btrfs_info(info, "allowing degraded mounts");
|
|
btrfs_set_opt(info->mount_opt, DEGRADED);
|
|
break;
|
|
case Opt_subvol:
|
|
case Opt_subvol_empty:
|
|
case Opt_subvolid:
|
|
case Opt_device:
|
|
/*
|
|
* These are parsed by btrfs_parse_subvol_options or
|
|
* btrfs_parse_device_options and can be ignored here.
|
|
*/
|
|
break;
|
|
case Opt_nodatasum:
|
|
btrfs_set_and_info(info, NODATASUM,
|
|
"setting nodatasum");
|
|
break;
|
|
case Opt_datasum:
|
|
if (btrfs_test_opt(info, NODATASUM)) {
|
|
if (btrfs_test_opt(info, NODATACOW))
|
|
btrfs_info(info,
|
|
"setting datasum, datacow enabled");
|
|
else
|
|
btrfs_info(info, "setting datasum");
|
|
}
|
|
btrfs_clear_opt(info->mount_opt, NODATACOW);
|
|
btrfs_clear_opt(info->mount_opt, NODATASUM);
|
|
break;
|
|
case Opt_nodatacow:
|
|
if (!btrfs_test_opt(info, NODATACOW)) {
|
|
if (!btrfs_test_opt(info, COMPRESS) ||
|
|
!btrfs_test_opt(info, FORCE_COMPRESS)) {
|
|
btrfs_info(info,
|
|
"setting nodatacow, compression disabled");
|
|
} else {
|
|
btrfs_info(info, "setting nodatacow");
|
|
}
|
|
}
|
|
btrfs_clear_opt(info->mount_opt, COMPRESS);
|
|
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
|
|
btrfs_set_opt(info->mount_opt, NODATACOW);
|
|
btrfs_set_opt(info->mount_opt, NODATASUM);
|
|
break;
|
|
case Opt_datacow:
|
|
btrfs_clear_and_info(info, NODATACOW,
|
|
"setting datacow");
|
|
break;
|
|
case Opt_compress_force:
|
|
case Opt_compress_force_type:
|
|
compress_force = true;
|
|
fallthrough;
|
|
case Opt_compress:
|
|
case Opt_compress_type:
|
|
saved_compress_type = btrfs_test_opt(info,
|
|
COMPRESS) ?
|
|
info->compress_type : BTRFS_COMPRESS_NONE;
|
|
saved_compress_force =
|
|
btrfs_test_opt(info, FORCE_COMPRESS);
|
|
saved_compress_level = info->compress_level;
|
|
if (token == Opt_compress ||
|
|
token == Opt_compress_force ||
|
|
strncmp(args[0].from, "zlib", 4) == 0) {
|
|
compress_type = "zlib";
|
|
|
|
info->compress_type = BTRFS_COMPRESS_ZLIB;
|
|
info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
|
|
/*
|
|
* args[0] contains uninitialized data since
|
|
* for these tokens we don't expect any
|
|
* parameter.
|
|
*/
|
|
if (token != Opt_compress &&
|
|
token != Opt_compress_force)
|
|
info->compress_level =
|
|
btrfs_compress_str2level(
|
|
BTRFS_COMPRESS_ZLIB,
|
|
args[0].from + 4);
|
|
btrfs_set_opt(info->mount_opt, COMPRESS);
|
|
btrfs_clear_opt(info->mount_opt, NODATACOW);
|
|
btrfs_clear_opt(info->mount_opt, NODATASUM);
|
|
no_compress = 0;
|
|
} else if (strncmp(args[0].from, "lzo", 3) == 0) {
|
|
compress_type = "lzo";
|
|
info->compress_type = BTRFS_COMPRESS_LZO;
|
|
info->compress_level = 0;
|
|
btrfs_set_opt(info->mount_opt, COMPRESS);
|
|
btrfs_clear_opt(info->mount_opt, NODATACOW);
|
|
btrfs_clear_opt(info->mount_opt, NODATASUM);
|
|
btrfs_set_fs_incompat(info, COMPRESS_LZO);
|
|
no_compress = 0;
|
|
} else if (strncmp(args[0].from, "zstd", 4) == 0) {
|
|
compress_type = "zstd";
|
|
info->compress_type = BTRFS_COMPRESS_ZSTD;
|
|
info->compress_level =
|
|
btrfs_compress_str2level(
|
|
BTRFS_COMPRESS_ZSTD,
|
|
args[0].from + 4);
|
|
btrfs_set_opt(info->mount_opt, COMPRESS);
|
|
btrfs_clear_opt(info->mount_opt, NODATACOW);
|
|
btrfs_clear_opt(info->mount_opt, NODATASUM);
|
|
btrfs_set_fs_incompat(info, COMPRESS_ZSTD);
|
|
no_compress = 0;
|
|
} else if (strncmp(args[0].from, "no", 2) == 0) {
|
|
compress_type = "no";
|
|
info->compress_level = 0;
|
|
info->compress_type = 0;
|
|
btrfs_clear_opt(info->mount_opt, COMPRESS);
|
|
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
|
|
compress_force = false;
|
|
no_compress++;
|
|
} else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (compress_force) {
|
|
btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
|
|
} else {
|
|
/*
|
|
* If we remount from compress-force=xxx to
|
|
* compress=xxx, we need clear FORCE_COMPRESS
|
|
* flag, otherwise, there is no way for users
|
|
* to disable forcible compression separately.
|
|
*/
|
|
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
|
|
}
|
|
if (no_compress == 1) {
|
|
btrfs_info(info, "use no compression");
|
|
} else if ((info->compress_type != saved_compress_type) ||
|
|
(compress_force != saved_compress_force) ||
|
|
(info->compress_level != saved_compress_level)) {
|
|
btrfs_info(info, "%s %s compression, level %d",
|
|
(compress_force) ? "force" : "use",
|
|
compress_type, info->compress_level);
|
|
}
|
|
compress_force = false;
|
|
break;
|
|
case Opt_ssd:
|
|
btrfs_set_and_info(info, SSD,
|
|
"enabling ssd optimizations");
|
|
btrfs_clear_opt(info->mount_opt, NOSSD);
|
|
break;
|
|
case Opt_ssd_spread:
|
|
btrfs_set_and_info(info, SSD,
|
|
"enabling ssd optimizations");
|
|
btrfs_set_and_info(info, SSD_SPREAD,
|
|
"using spread ssd allocation scheme");
|
|
btrfs_clear_opt(info->mount_opt, NOSSD);
|
|
break;
|
|
case Opt_nossd:
|
|
btrfs_set_opt(info->mount_opt, NOSSD);
|
|
btrfs_clear_and_info(info, SSD,
|
|
"not using ssd optimizations");
|
|
fallthrough;
|
|
case Opt_nossd_spread:
|
|
btrfs_clear_and_info(info, SSD_SPREAD,
|
|
"not using spread ssd allocation scheme");
|
|
break;
|
|
case Opt_barrier:
|
|
btrfs_clear_and_info(info, NOBARRIER,
|
|
"turning on barriers");
|
|
break;
|
|
case Opt_nobarrier:
|
|
btrfs_set_and_info(info, NOBARRIER,
|
|
"turning off barriers");
|
|
break;
|
|
case Opt_thread_pool:
|
|
ret = match_int(&args[0], &intarg);
|
|
if (ret) {
|
|
goto out;
|
|
} else if (intarg == 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
info->thread_pool_size = intarg;
|
|
break;
|
|
case Opt_max_inline:
|
|
num = match_strdup(&args[0]);
|
|
if (num) {
|
|
info->max_inline = memparse(num, NULL);
|
|
kfree(num);
|
|
|
|
if (info->max_inline) {
|
|
info->max_inline = min_t(u64,
|
|
info->max_inline,
|
|
info->sectorsize);
|
|
}
|
|
btrfs_info(info, "max_inline at %llu",
|
|
info->max_inline);
|
|
} else {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
break;
|
|
case Opt_acl:
|
|
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
|
|
info->sb->s_flags |= SB_POSIXACL;
|
|
break;
|
|
#else
|
|
btrfs_err(info, "support for ACL not compiled in!");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
#endif
|
|
case Opt_noacl:
|
|
info->sb->s_flags &= ~SB_POSIXACL;
|
|
break;
|
|
case Opt_notreelog:
|
|
btrfs_set_and_info(info, NOTREELOG,
|
|
"disabling tree log");
|
|
break;
|
|
case Opt_treelog:
|
|
btrfs_clear_and_info(info, NOTREELOG,
|
|
"enabling tree log");
|
|
break;
|
|
case Opt_norecovery:
|
|
case Opt_nologreplay:
|
|
btrfs_warn(info,
|
|
"'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
|
|
btrfs_set_and_info(info, NOLOGREPLAY,
|
|
"disabling log replay at mount time");
|
|
break;
|
|
case Opt_flushoncommit:
|
|
btrfs_set_and_info(info, FLUSHONCOMMIT,
|
|
"turning on flush-on-commit");
|
|
break;
|
|
case Opt_noflushoncommit:
|
|
btrfs_clear_and_info(info, FLUSHONCOMMIT,
|
|
"turning off flush-on-commit");
|
|
break;
|
|
case Opt_ratio:
|
|
ret = match_int(&args[0], &intarg);
|
|
if (ret)
|
|
goto out;
|
|
info->metadata_ratio = intarg;
|
|
btrfs_info(info, "metadata ratio %u",
|
|
info->metadata_ratio);
|
|
break;
|
|
case Opt_discard:
|
|
case Opt_discard_mode:
|
|
if (token == Opt_discard ||
|
|
strcmp(args[0].from, "sync") == 0) {
|
|
btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC);
|
|
btrfs_set_and_info(info, DISCARD_SYNC,
|
|
"turning on sync discard");
|
|
} else if (strcmp(args[0].from, "async") == 0) {
|
|
btrfs_clear_opt(info->mount_opt, DISCARD_SYNC);
|
|
btrfs_set_and_info(info, DISCARD_ASYNC,
|
|
"turning on async discard");
|
|
} else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
case Opt_nodiscard:
|
|
btrfs_clear_and_info(info, DISCARD_SYNC,
|
|
"turning off discard");
|
|
btrfs_clear_and_info(info, DISCARD_ASYNC,
|
|
"turning off async discard");
|
|
break;
|
|
case Opt_space_cache:
|
|
case Opt_space_cache_version:
|
|
if (token == Opt_space_cache ||
|
|
strcmp(args[0].from, "v1") == 0) {
|
|
btrfs_clear_opt(info->mount_opt,
|
|
FREE_SPACE_TREE);
|
|
btrfs_set_and_info(info, SPACE_CACHE,
|
|
"enabling disk space caching");
|
|
} else if (strcmp(args[0].from, "v2") == 0) {
|
|
btrfs_clear_opt(info->mount_opt,
|
|
SPACE_CACHE);
|
|
btrfs_set_and_info(info, FREE_SPACE_TREE,
|
|
"enabling free space tree");
|
|
} else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
case Opt_rescan_uuid_tree:
|
|
btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
|
|
break;
|
|
case Opt_no_space_cache:
|
|
if (btrfs_test_opt(info, SPACE_CACHE)) {
|
|
btrfs_clear_and_info(info, SPACE_CACHE,
|
|
"disabling disk space caching");
|
|
}
|
|
if (btrfs_test_opt(info, FREE_SPACE_TREE)) {
|
|
btrfs_clear_and_info(info, FREE_SPACE_TREE,
|
|
"disabling free space tree");
|
|
}
|
|
break;
|
|
case Opt_inode_cache:
|
|
btrfs_warn(info,
|
|
"the 'inode_cache' option is deprecated and will have no effect from 5.11");
|
|
btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
|
|
"enabling inode map caching");
|
|
break;
|
|
case Opt_noinode_cache:
|
|
btrfs_clear_pending_and_info(info, INODE_MAP_CACHE,
|
|
"disabling inode map caching");
|
|
break;
|
|
case Opt_clear_cache:
|
|
btrfs_set_and_info(info, CLEAR_CACHE,
|
|
"force clearing of disk cache");
|
|
break;
|
|
case Opt_user_subvol_rm_allowed:
|
|
btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
|
|
break;
|
|
case Opt_enospc_debug:
|
|
btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
|
|
break;
|
|
case Opt_noenospc_debug:
|
|
btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
|
|
break;
|
|
case Opt_defrag:
|
|
btrfs_set_and_info(info, AUTO_DEFRAG,
|
|
"enabling auto defrag");
|
|
break;
|
|
case Opt_nodefrag:
|
|
btrfs_clear_and_info(info, AUTO_DEFRAG,
|
|
"disabling auto defrag");
|
|
break;
|
|
case Opt_recovery:
|
|
case Opt_usebackuproot:
|
|
btrfs_warn(info,
|
|
"'%s' is deprecated, use 'rescue=usebackuproot' instead",
|
|
token == Opt_recovery ? "recovery" :
|
|
"usebackuproot");
|
|
btrfs_info(info,
|
|
"trying to use backup root at mount time");
|
|
btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
|
|
break;
|
|
case Opt_skip_balance:
|
|
btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
|
|
break;
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
case Opt_check_integrity_including_extent_data:
|
|
btrfs_info(info,
|
|
"enabling check integrity including extent data");
|
|
btrfs_set_opt(info->mount_opt,
|
|
CHECK_INTEGRITY_INCLUDING_EXTENT_DATA);
|
|
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
|
|
break;
|
|
case Opt_check_integrity:
|
|
btrfs_info(info, "enabling check integrity");
|
|
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
|
|
break;
|
|
case Opt_check_integrity_print_mask:
|
|
ret = match_int(&args[0], &intarg);
|
|
if (ret)
|
|
goto out;
|
|
info->check_integrity_print_mask = intarg;
|
|
btrfs_info(info, "check_integrity_print_mask 0x%x",
|
|
info->check_integrity_print_mask);
|
|
break;
|
|
#else
|
|
case Opt_check_integrity_including_extent_data:
|
|
case Opt_check_integrity:
|
|
case Opt_check_integrity_print_mask:
|
|
btrfs_err(info,
|
|
"support for check_integrity* not compiled in!");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
#endif
|
|
case Opt_fatal_errors:
|
|
if (strcmp(args[0].from, "panic") == 0)
|
|
btrfs_set_opt(info->mount_opt,
|
|
PANIC_ON_FATAL_ERROR);
|
|
else if (strcmp(args[0].from, "bug") == 0)
|
|
btrfs_clear_opt(info->mount_opt,
|
|
PANIC_ON_FATAL_ERROR);
|
|
else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
case Opt_commit_interval:
|
|
intarg = 0;
|
|
ret = match_int(&args[0], &intarg);
|
|
if (ret)
|
|
goto out;
|
|
if (intarg == 0) {
|
|
btrfs_info(info,
|
|
"using default commit interval %us",
|
|
BTRFS_DEFAULT_COMMIT_INTERVAL);
|
|
intarg = BTRFS_DEFAULT_COMMIT_INTERVAL;
|
|
} else if (intarg > 300) {
|
|
btrfs_warn(info, "excessive commit interval %d",
|
|
intarg);
|
|
}
|
|
info->commit_interval = intarg;
|
|
break;
|
|
case Opt_rescue:
|
|
ret = parse_rescue_options(info, args[0].from);
|
|
if (ret < 0)
|
|
goto out;
|
|
break;
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
case Opt_fragment_all:
|
|
btrfs_info(info, "fragmenting all space");
|
|
btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
|
|
btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
|
|
break;
|
|
case Opt_fragment_metadata:
|
|
btrfs_info(info, "fragmenting metadata");
|
|
btrfs_set_opt(info->mount_opt,
|
|
FRAGMENT_METADATA);
|
|
break;
|
|
case Opt_fragment_data:
|
|
btrfs_info(info, "fragmenting data");
|
|
btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
|
|
case Opt_ref_verify:
|
|
btrfs_info(info, "doing ref verification");
|
|
btrfs_set_opt(info->mount_opt, REF_VERIFY);
|
|
break;
|
|
#endif
|
|
case Opt_err:
|
|
btrfs_err(info, "unrecognized mount option '%s'", p);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
check:
|
|
/*
|
|
* Extra check for current option against current flag
|
|
*/
|
|
if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) {
|
|
btrfs_err(info,
|
|
"nologreplay must be used with ro mount option");
|
|
ret = -EINVAL;
|
|
}
|
|
out:
|
|
if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) &&
|
|
!btrfs_test_opt(info, FREE_SPACE_TREE) &&
|
|
!btrfs_test_opt(info, CLEAR_CACHE)) {
|
|
btrfs_err(info, "cannot disable free space tree");
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
if (!ret && btrfs_test_opt(info, SPACE_CACHE))
|
|
btrfs_info(info, "disk space caching is enabled");
|
|
if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE))
|
|
btrfs_info(info, "using free space tree");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Parse mount options that are required early in the mount process.
|
|
*
|
|
* All other options will be parsed on much later in the mount process and
|
|
* only when we need to allocate a new super block.
|
|
*/
|
|
static int btrfs_parse_device_options(const char *options, fmode_t flags,
|
|
void *holder)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
char *device_name, *opts, *orig, *p;
|
|
struct btrfs_device *device = NULL;
|
|
int error = 0;
|
|
|
|
lockdep_assert_held(&uuid_mutex);
|
|
|
|
if (!options)
|
|
return 0;
|
|
|
|
/*
|
|
* strsep changes the string, duplicate it because btrfs_parse_options
|
|
* gets called later
|
|
*/
|
|
opts = kstrdup(options, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
orig = opts;
|
|
|
|
while ((p = strsep(&opts, ",")) != NULL) {
|
|
int token;
|
|
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
if (token == Opt_device) {
|
|
device_name = match_strdup(&args[0]);
|
|
if (!device_name) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
device = btrfs_scan_one_device(device_name, flags,
|
|
holder);
|
|
kfree(device_name);
|
|
if (IS_ERR(device)) {
|
|
error = PTR_ERR(device);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Parse mount options that are related to subvolume id
|
|
*
|
|
* The value is later passed to mount_subvol()
|
|
*/
|
|
static int btrfs_parse_subvol_options(const char *options, char **subvol_name,
|
|
u64 *subvol_objectid)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
char *opts, *orig, *p;
|
|
int error = 0;
|
|
u64 subvolid;
|
|
|
|
if (!options)
|
|
return 0;
|
|
|
|
/*
|
|
* strsep changes the string, duplicate it because
|
|
* btrfs_parse_device_options gets called later
|
|
*/
|
|
opts = kstrdup(options, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
orig = opts;
|
|
|
|
while ((p = strsep(&opts, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_subvol:
|
|
kfree(*subvol_name);
|
|
*subvol_name = match_strdup(&args[0]);
|
|
if (!*subvol_name) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
break;
|
|
case Opt_subvolid:
|
|
error = match_u64(&args[0], &subvolid);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* we want the original fs_tree */
|
|
if (subvolid == 0)
|
|
subvolid = BTRFS_FS_TREE_OBJECTID;
|
|
|
|
*subvol_objectid = subvolid;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(orig);
|
|
return error;
|
|
}
|
|
|
|
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
|
|
u64 subvol_objectid)
|
|
{
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
struct btrfs_root *fs_root = NULL;
|
|
struct btrfs_root_ref *root_ref;
|
|
struct btrfs_inode_ref *inode_ref;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path = NULL;
|
|
char *name = NULL, *ptr;
|
|
u64 dirid;
|
|
int len;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
path->leave_spinning = 1;
|
|
|
|
name = kmalloc(PATH_MAX, GFP_KERNEL);
|
|
if (!name) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
ptr = name + PATH_MAX - 1;
|
|
ptr[0] = '\0';
|
|
|
|
/*
|
|
* Walk up the subvolume trees in the tree of tree roots by root
|
|
* backrefs until we hit the top-level subvolume.
|
|
*/
|
|
while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
|
|
key.objectid = subvol_objectid;
|
|
key.type = BTRFS_ROOT_BACKREF_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0) {
|
|
goto err;
|
|
} else if (ret > 0) {
|
|
ret = btrfs_previous_item(root, path, subvol_objectid,
|
|
BTRFS_ROOT_BACKREF_KEY);
|
|
if (ret < 0) {
|
|
goto err;
|
|
} else if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
subvol_objectid = key.offset;
|
|
|
|
root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_root_ref);
|
|
len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
|
|
ptr -= len + 1;
|
|
if (ptr < name) {
|
|
ret = -ENAMETOOLONG;
|
|
goto err;
|
|
}
|
|
read_extent_buffer(path->nodes[0], ptr + 1,
|
|
(unsigned long)(root_ref + 1), len);
|
|
ptr[0] = '/';
|
|
dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
|
|
btrfs_release_path(path);
|
|
|
|
fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true);
|
|
if (IS_ERR(fs_root)) {
|
|
ret = PTR_ERR(fs_root);
|
|
fs_root = NULL;
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Walk up the filesystem tree by inode refs until we hit the
|
|
* root directory.
|
|
*/
|
|
while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
|
|
key.objectid = dirid;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
|
|
if (ret < 0) {
|
|
goto err;
|
|
} else if (ret > 0) {
|
|
ret = btrfs_previous_item(fs_root, path, dirid,
|
|
BTRFS_INODE_REF_KEY);
|
|
if (ret < 0) {
|
|
goto err;
|
|
} else if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
dirid = key.offset;
|
|
|
|
inode_ref = btrfs_item_ptr(path->nodes[0],
|
|
path->slots[0],
|
|
struct btrfs_inode_ref);
|
|
len = btrfs_inode_ref_name_len(path->nodes[0],
|
|
inode_ref);
|
|
ptr -= len + 1;
|
|
if (ptr < name) {
|
|
ret = -ENAMETOOLONG;
|
|
goto err;
|
|
}
|
|
read_extent_buffer(path->nodes[0], ptr + 1,
|
|
(unsigned long)(inode_ref + 1), len);
|
|
ptr[0] = '/';
|
|
btrfs_release_path(path);
|
|
}
|
|
btrfs_put_root(fs_root);
|
|
fs_root = NULL;
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
if (ptr == name + PATH_MAX - 1) {
|
|
name[0] = '/';
|
|
name[1] = '\0';
|
|
} else {
|
|
memmove(name, ptr, name + PATH_MAX - ptr);
|
|
}
|
|
return name;
|
|
|
|
err:
|
|
btrfs_put_root(fs_root);
|
|
btrfs_free_path(path);
|
|
kfree(name);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
|
|
{
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key location;
|
|
u64 dir_id;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->leave_spinning = 1;
|
|
|
|
/*
|
|
* Find the "default" dir item which points to the root item that we
|
|
* will mount by default if we haven't been given a specific subvolume
|
|
* to mount.
|
|
*/
|
|
dir_id = btrfs_super_root_dir(fs_info->super_copy);
|
|
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
|
|
if (IS_ERR(di)) {
|
|
btrfs_free_path(path);
|
|
return PTR_ERR(di);
|
|
}
|
|
if (!di) {
|
|
/*
|
|
* Ok the default dir item isn't there. This is weird since
|
|
* it's always been there, but don't freak out, just try and
|
|
* mount the top-level subvolume.
|
|
*/
|
|
btrfs_free_path(path);
|
|
*objectid = BTRFS_FS_TREE_OBJECTID;
|
|
return 0;
|
|
}
|
|
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
|
|
btrfs_free_path(path);
|
|
*objectid = location.objectid;
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_fill_super(struct super_block *sb,
|
|
struct btrfs_fs_devices *fs_devices,
|
|
void *data)
|
|
{
|
|
struct inode *inode;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
int err;
|
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_magic = BTRFS_SUPER_MAGIC;
|
|
sb->s_op = &btrfs_super_ops;
|
|
sb->s_d_op = &btrfs_dentry_operations;
|
|
sb->s_export_op = &btrfs_export_ops;
|
|
sb->s_xattr = btrfs_xattr_handlers;
|
|
sb->s_time_gran = 1;
|
|
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
|
|
sb->s_flags |= SB_POSIXACL;
|
|
#endif
|
|
sb->s_flags |= SB_I_VERSION;
|
|
sb->s_iflags |= SB_I_CGROUPWB;
|
|
|
|
err = super_setup_bdi(sb);
|
|
if (err) {
|
|
btrfs_err(fs_info, "super_setup_bdi failed");
|
|
return err;
|
|
}
|
|
|
|
err = open_ctree(sb, fs_devices, (char *)data);
|
|
if (err) {
|
|
btrfs_err(fs_info, "open_ctree failed");
|
|
return err;
|
|
}
|
|
|
|
inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto fail_close;
|
|
}
|
|
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root) {
|
|
err = -ENOMEM;
|
|
goto fail_close;
|
|
}
|
|
|
|
cleancache_init_fs(sb);
|
|
sb->s_flags |= SB_ACTIVE;
|
|
return 0;
|
|
|
|
fail_close:
|
|
close_ctree(fs_info);
|
|
return err;
|
|
}
|
|
|
|
int btrfs_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
|
|
trace_btrfs_sync_fs(fs_info, wait);
|
|
|
|
if (!wait) {
|
|
filemap_flush(fs_info->btree_inode->i_mapping);
|
|
return 0;
|
|
}
|
|
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
|
|
|
|
trans = btrfs_attach_transaction_barrier(root);
|
|
if (IS_ERR(trans)) {
|
|
/* no transaction, don't bother */
|
|
if (PTR_ERR(trans) == -ENOENT) {
|
|
/*
|
|
* Exit unless we have some pending changes
|
|
* that need to go through commit
|
|
*/
|
|
if (fs_info->pending_changes == 0)
|
|
return 0;
|
|
/*
|
|
* A non-blocking test if the fs is frozen. We must not
|
|
* start a new transaction here otherwise a deadlock
|
|
* happens. The pending operations are delayed to the
|
|
* next commit after thawing.
|
|
*/
|
|
if (sb_start_write_trylock(sb))
|
|
sb_end_write(sb);
|
|
else
|
|
return 0;
|
|
trans = btrfs_start_transaction(root, 0);
|
|
}
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
}
|
|
return btrfs_commit_transaction(trans);
|
|
}
|
|
|
|
static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
|
|
{
|
|
struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
|
|
const char *compress_type;
|
|
const char *subvol_name;
|
|
|
|
if (btrfs_test_opt(info, DEGRADED))
|
|
seq_puts(seq, ",degraded");
|
|
if (btrfs_test_opt(info, NODATASUM))
|
|
seq_puts(seq, ",nodatasum");
|
|
if (btrfs_test_opt(info, NODATACOW))
|
|
seq_puts(seq, ",nodatacow");
|
|
if (btrfs_test_opt(info, NOBARRIER))
|
|
seq_puts(seq, ",nobarrier");
|
|
if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
|
|
seq_printf(seq, ",max_inline=%llu", info->max_inline);
|
|
if (info->thread_pool_size != min_t(unsigned long,
|
|
num_online_cpus() + 2, 8))
|
|
seq_printf(seq, ",thread_pool=%u", info->thread_pool_size);
|
|
if (btrfs_test_opt(info, COMPRESS)) {
|
|
compress_type = btrfs_compress_type2str(info->compress_type);
|
|
if (btrfs_test_opt(info, FORCE_COMPRESS))
|
|
seq_printf(seq, ",compress-force=%s", compress_type);
|
|
else
|
|
seq_printf(seq, ",compress=%s", compress_type);
|
|
if (info->compress_level)
|
|
seq_printf(seq, ":%d", info->compress_level);
|
|
}
|
|
if (btrfs_test_opt(info, NOSSD))
|
|
seq_puts(seq, ",nossd");
|
|
if (btrfs_test_opt(info, SSD_SPREAD))
|
|
seq_puts(seq, ",ssd_spread");
|
|
else if (btrfs_test_opt(info, SSD))
|
|
seq_puts(seq, ",ssd");
|
|
if (btrfs_test_opt(info, NOTREELOG))
|
|
seq_puts(seq, ",notreelog");
|
|
if (btrfs_test_opt(info, NOLOGREPLAY))
|
|
seq_puts(seq, ",rescue=nologreplay");
|
|
if (btrfs_test_opt(info, FLUSHONCOMMIT))
|
|
seq_puts(seq, ",flushoncommit");
|
|
if (btrfs_test_opt(info, DISCARD_SYNC))
|
|
seq_puts(seq, ",discard");
|
|
if (btrfs_test_opt(info, DISCARD_ASYNC))
|
|
seq_puts(seq, ",discard=async");
|
|
if (!(info->sb->s_flags & SB_POSIXACL))
|
|
seq_puts(seq, ",noacl");
|
|
if (btrfs_test_opt(info, SPACE_CACHE))
|
|
seq_puts(seq, ",space_cache");
|
|
else if (btrfs_test_opt(info, FREE_SPACE_TREE))
|
|
seq_puts(seq, ",space_cache=v2");
|
|
else
|
|
seq_puts(seq, ",nospace_cache");
|
|
if (btrfs_test_opt(info, RESCAN_UUID_TREE))
|
|
seq_puts(seq, ",rescan_uuid_tree");
|
|
if (btrfs_test_opt(info, CLEAR_CACHE))
|
|
seq_puts(seq, ",clear_cache");
|
|
if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED))
|
|
seq_puts(seq, ",user_subvol_rm_allowed");
|
|
if (btrfs_test_opt(info, ENOSPC_DEBUG))
|
|
seq_puts(seq, ",enospc_debug");
|
|
if (btrfs_test_opt(info, AUTO_DEFRAG))
|
|
seq_puts(seq, ",autodefrag");
|
|
if (btrfs_test_opt(info, INODE_MAP_CACHE))
|
|
seq_puts(seq, ",inode_cache");
|
|
if (btrfs_test_opt(info, SKIP_BALANCE))
|
|
seq_puts(seq, ",skip_balance");
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA))
|
|
seq_puts(seq, ",check_int_data");
|
|
else if (btrfs_test_opt(info, CHECK_INTEGRITY))
|
|
seq_puts(seq, ",check_int");
|
|
if (info->check_integrity_print_mask)
|
|
seq_printf(seq, ",check_int_print_mask=%d",
|
|
info->check_integrity_print_mask);
|
|
#endif
|
|
if (info->metadata_ratio)
|
|
seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio);
|
|
if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR))
|
|
seq_puts(seq, ",fatal_errors=panic");
|
|
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
|
|
seq_printf(seq, ",commit=%u", info->commit_interval);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (btrfs_test_opt(info, FRAGMENT_DATA))
|
|
seq_puts(seq, ",fragment=data");
|
|
if (btrfs_test_opt(info, FRAGMENT_METADATA))
|
|
seq_puts(seq, ",fragment=metadata");
|
|
#endif
|
|
if (btrfs_test_opt(info, REF_VERIFY))
|
|
seq_puts(seq, ",ref_verify");
|
|
seq_printf(seq, ",subvolid=%llu",
|
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid);
|
|
subvol_name = btrfs_get_subvol_name_from_objectid(info,
|
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid);
|
|
if (!IS_ERR(subvol_name)) {
|
|
seq_puts(seq, ",subvol=");
|
|
seq_escape(seq, subvol_name, " \t\n\\");
|
|
kfree(subvol_name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_test_super(struct super_block *s, void *data)
|
|
{
|
|
struct btrfs_fs_info *p = data;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(s);
|
|
|
|
return fs_info->fs_devices == p->fs_devices;
|
|
}
|
|
|
|
static int btrfs_set_super(struct super_block *s, void *data)
|
|
{
|
|
int err = set_anon_super(s, data);
|
|
if (!err)
|
|
s->s_fs_info = data;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* subvolumes are identified by ino 256
|
|
*/
|
|
static inline int is_subvolume_inode(struct inode *inode)
|
|
{
|
|
if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
|
|
struct vfsmount *mnt)
|
|
{
|
|
struct dentry *root;
|
|
int ret;
|
|
|
|
if (!subvol_name) {
|
|
if (!subvol_objectid) {
|
|
ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
|
|
&subvol_objectid);
|
|
if (ret) {
|
|
root = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
subvol_name = btrfs_get_subvol_name_from_objectid(
|
|
btrfs_sb(mnt->mnt_sb), subvol_objectid);
|
|
if (IS_ERR(subvol_name)) {
|
|
root = ERR_CAST(subvol_name);
|
|
subvol_name = NULL;
|
|
goto out;
|
|
}
|
|
|
|
}
|
|
|
|
root = mount_subtree(mnt, subvol_name);
|
|
/* mount_subtree() drops our reference on the vfsmount. */
|
|
mnt = NULL;
|
|
|
|
if (!IS_ERR(root)) {
|
|
struct super_block *s = root->d_sb;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(s);
|
|
struct inode *root_inode = d_inode(root);
|
|
u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
|
|
|
|
ret = 0;
|
|
if (!is_subvolume_inode(root_inode)) {
|
|
btrfs_err(fs_info, "'%s' is not a valid subvolume",
|
|
subvol_name);
|
|
ret = -EINVAL;
|
|
}
|
|
if (subvol_objectid && root_objectid != subvol_objectid) {
|
|
/*
|
|
* This will also catch a race condition where a
|
|
* subvolume which was passed by ID is renamed and
|
|
* another subvolume is renamed over the old location.
|
|
*/
|
|
btrfs_err(fs_info,
|
|
"subvol '%s' does not match subvolid %llu",
|
|
subvol_name, subvol_objectid);
|
|
ret = -EINVAL;
|
|
}
|
|
if (ret) {
|
|
dput(root);
|
|
root = ERR_PTR(ret);
|
|
deactivate_locked_super(s);
|
|
}
|
|
}
|
|
|
|
out:
|
|
mntput(mnt);
|
|
kfree(subvol_name);
|
|
return root;
|
|
}
|
|
|
|
/*
|
|
* Find a superblock for the given device / mount point.
|
|
*
|
|
* Note: This is based on mount_bdev from fs/super.c with a few additions
|
|
* for multiple device setup. Make sure to keep it in sync.
|
|
*/
|
|
static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
|
|
int flags, const char *device_name, void *data)
|
|
{
|
|
struct block_device *bdev = NULL;
|
|
struct super_block *s;
|
|
struct btrfs_device *device = NULL;
|
|
struct btrfs_fs_devices *fs_devices = NULL;
|
|
struct btrfs_fs_info *fs_info = NULL;
|
|
void *new_sec_opts = NULL;
|
|
fmode_t mode = FMODE_READ;
|
|
int error = 0;
|
|
|
|
if (!(flags & SB_RDONLY))
|
|
mode |= FMODE_WRITE;
|
|
|
|
if (data) {
|
|
error = security_sb_eat_lsm_opts(data, &new_sec_opts);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Setup a dummy root and fs_info for test/set super. This is because
|
|
* we don't actually fill this stuff out until open_ctree, but we need
|
|
* then open_ctree will properly initialize the file system specific
|
|
* settings later. btrfs_init_fs_info initializes the static elements
|
|
* of the fs_info (locks and such) to make cleanup easier if we find a
|
|
* superblock with our given fs_devices later on at sget() time.
|
|
*/
|
|
fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
|
|
if (!fs_info) {
|
|
error = -ENOMEM;
|
|
goto error_sec_opts;
|
|
}
|
|
btrfs_init_fs_info(fs_info);
|
|
|
|
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
|
|
fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
|
|
if (!fs_info->super_copy || !fs_info->super_for_commit) {
|
|
error = -ENOMEM;
|
|
goto error_fs_info;
|
|
}
|
|
|
|
mutex_lock(&uuid_mutex);
|
|
error = btrfs_parse_device_options(data, mode, fs_type);
|
|
if (error) {
|
|
mutex_unlock(&uuid_mutex);
|
|
goto error_fs_info;
|
|
}
|
|
|
|
device = btrfs_scan_one_device(device_name, mode, fs_type);
|
|
if (IS_ERR(device)) {
|
|
mutex_unlock(&uuid_mutex);
|
|
error = PTR_ERR(device);
|
|
goto error_fs_info;
|
|
}
|
|
|
|
fs_devices = device->fs_devices;
|
|
fs_info->fs_devices = fs_devices;
|
|
|
|
error = btrfs_open_devices(fs_devices, mode, fs_type);
|
|
mutex_unlock(&uuid_mutex);
|
|
if (error)
|
|
goto error_fs_info;
|
|
|
|
if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
|
|
error = -EACCES;
|
|
goto error_close_devices;
|
|
}
|
|
|
|
bdev = fs_devices->latest_bdev;
|
|
s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
|
|
fs_info);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto error_close_devices;
|
|
}
|
|
|
|
if (s->s_root) {
|
|
btrfs_close_devices(fs_devices);
|
|
btrfs_free_fs_info(fs_info);
|
|
if ((flags ^ s->s_flags) & SB_RDONLY)
|
|
error = -EBUSY;
|
|
} else {
|
|
snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
|
|
btrfs_sb(s)->bdev_holder = fs_type;
|
|
if (!strstr(crc32c_impl(), "generic"))
|
|
set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
|
|
error = btrfs_fill_super(s, fs_devices, data);
|
|
}
|
|
if (!error)
|
|
error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
|
|
security_free_mnt_opts(&new_sec_opts);
|
|
if (error) {
|
|
deactivate_locked_super(s);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
return dget(s->s_root);
|
|
|
|
error_close_devices:
|
|
btrfs_close_devices(fs_devices);
|
|
error_fs_info:
|
|
btrfs_free_fs_info(fs_info);
|
|
error_sec_opts:
|
|
security_free_mnt_opts(&new_sec_opts);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Mount function which is called by VFS layer.
|
|
*
|
|
* In order to allow mounting a subvolume directly, btrfs uses mount_subtree()
|
|
* which needs vfsmount* of device's root (/). This means device's root has to
|
|
* be mounted internally in any case.
|
|
*
|
|
* Operation flow:
|
|
* 1. Parse subvol id related options for later use in mount_subvol().
|
|
*
|
|
* 2. Mount device's root (/) by calling vfs_kern_mount().
|
|
*
|
|
* NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the
|
|
* first place. In order to avoid calling btrfs_mount() again, we use
|
|
* different file_system_type which is not registered to VFS by
|
|
* register_filesystem() (btrfs_root_fs_type). As a result,
|
|
* btrfs_mount_root() is called. The return value will be used by
|
|
* mount_subtree() in mount_subvol().
|
|
*
|
|
* 3. Call mount_subvol() to get the dentry of subvolume. Since there is
|
|
* "btrfs subvolume set-default", mount_subvol() is called always.
|
|
*/
|
|
static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
|
|
const char *device_name, void *data)
|
|
{
|
|
struct vfsmount *mnt_root;
|
|
struct dentry *root;
|
|
char *subvol_name = NULL;
|
|
u64 subvol_objectid = 0;
|
|
int error = 0;
|
|
|
|
error = btrfs_parse_subvol_options(data, &subvol_name,
|
|
&subvol_objectid);
|
|
if (error) {
|
|
kfree(subvol_name);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/* mount device's root (/) */
|
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data);
|
|
if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) {
|
|
if (flags & SB_RDONLY) {
|
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
|
|
flags & ~SB_RDONLY, device_name, data);
|
|
} else {
|
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
|
|
flags | SB_RDONLY, device_name, data);
|
|
if (IS_ERR(mnt_root)) {
|
|
root = ERR_CAST(mnt_root);
|
|
kfree(subvol_name);
|
|
goto out;
|
|
}
|
|
|
|
down_write(&mnt_root->mnt_sb->s_umount);
|
|
error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL);
|
|
up_write(&mnt_root->mnt_sb->s_umount);
|
|
if (error < 0) {
|
|
root = ERR_PTR(error);
|
|
mntput(mnt_root);
|
|
kfree(subvol_name);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
if (IS_ERR(mnt_root)) {
|
|
root = ERR_CAST(mnt_root);
|
|
kfree(subvol_name);
|
|
goto out;
|
|
}
|
|
|
|
/* mount_subvol() will free subvol_name and mnt_root */
|
|
root = mount_subvol(subvol_name, subvol_objectid, mnt_root);
|
|
|
|
out:
|
|
return root;
|
|
}
|
|
|
|
static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
|
|
u32 new_pool_size, u32 old_pool_size)
|
|
{
|
|
if (new_pool_size == old_pool_size)
|
|
return;
|
|
|
|
fs_info->thread_pool_size = new_pool_size;
|
|
|
|
btrfs_info(fs_info, "resize thread pool %d -> %d",
|
|
old_pool_size, new_pool_size);
|
|
|
|
btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->endio_meta_write_workers,
|
|
new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
|
|
btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
|
|
new_pool_size);
|
|
}
|
|
|
|
static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
|
|
unsigned long old_opts, int flags)
|
|
{
|
|
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
|
|
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
|
|
(flags & SB_RDONLY))) {
|
|
/* wait for any defraggers to finish */
|
|
wait_event(fs_info->transaction_wait,
|
|
(atomic_read(&fs_info->defrag_running) == 0));
|
|
if (flags & SB_RDONLY)
|
|
sync_filesystem(fs_info->sb);
|
|
}
|
|
}
|
|
|
|
static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
|
|
unsigned long old_opts)
|
|
{
|
|
/*
|
|
* We need to cleanup all defragable inodes if the autodefragment is
|
|
* close or the filesystem is read only.
|
|
*/
|
|
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
|
|
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) {
|
|
btrfs_cleanup_defrag_inodes(fs_info);
|
|
}
|
|
|
|
/* If we toggled discard async */
|
|
if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
|
|
btrfs_test_opt(fs_info, DISCARD_ASYNC))
|
|
btrfs_discard_resume(fs_info);
|
|
else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
|
|
!btrfs_test_opt(fs_info, DISCARD_ASYNC))
|
|
btrfs_discard_cleanup(fs_info);
|
|
}
|
|
|
|
static int btrfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
unsigned old_flags = sb->s_flags;
|
|
unsigned long old_opts = fs_info->mount_opt;
|
|
unsigned long old_compress_type = fs_info->compress_type;
|
|
u64 old_max_inline = fs_info->max_inline;
|
|
u32 old_thread_pool_size = fs_info->thread_pool_size;
|
|
u32 old_metadata_ratio = fs_info->metadata_ratio;
|
|
int ret;
|
|
|
|
sync_filesystem(sb);
|
|
set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
|
|
|
|
if (data) {
|
|
void *new_sec_opts = NULL;
|
|
|
|
ret = security_sb_eat_lsm_opts(data, &new_sec_opts);
|
|
if (!ret)
|
|
ret = security_sb_remount(sb, new_sec_opts);
|
|
security_free_mnt_opts(&new_sec_opts);
|
|
if (ret)
|
|
goto restore;
|
|
}
|
|
|
|
ret = btrfs_parse_options(fs_info, data, *flags);
|
|
if (ret)
|
|
goto restore;
|
|
|
|
btrfs_remount_begin(fs_info, old_opts, *flags);
|
|
btrfs_resize_thread_pool(fs_info,
|
|
fs_info->thread_pool_size, old_thread_pool_size);
|
|
|
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
|
|
goto out;
|
|
|
|
if (*flags & SB_RDONLY) {
|
|
/*
|
|
* this also happens on 'umount -rf' or on shutdown, when
|
|
* the filesystem is busy.
|
|
*/
|
|
cancel_work_sync(&fs_info->async_reclaim_work);
|
|
cancel_work_sync(&fs_info->async_data_reclaim_work);
|
|
|
|
btrfs_discard_cleanup(fs_info);
|
|
|
|
/* wait for the uuid_scan task to finish */
|
|
down(&fs_info->uuid_tree_rescan_sem);
|
|
/* avoid complains from lockdep et al. */
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
|
|
sb->s_flags |= SB_RDONLY;
|
|
|
|
/*
|
|
* Setting SB_RDONLY will put the cleaner thread to
|
|
* sleep at the next loop if it's already active.
|
|
* If it's already asleep, we'll leave unused block
|
|
* groups on disk until we're mounted read-write again
|
|
* unless we clean them up here.
|
|
*/
|
|
btrfs_delete_unused_bgs(fs_info);
|
|
|
|
btrfs_dev_replace_suspend_for_unmount(fs_info);
|
|
btrfs_scrub_cancel(fs_info);
|
|
btrfs_pause_balance(fs_info);
|
|
|
|
/*
|
|
* Pause the qgroup rescan worker if it is running. We don't want
|
|
* it to be still running after we are in RO mode, as after that,
|
|
* by the time we unmount, it might have left a transaction open,
|
|
* so we would leak the transaction and/or crash.
|
|
*/
|
|
btrfs_qgroup_wait_for_completion(fs_info, false);
|
|
|
|
ret = btrfs_commit_super(fs_info);
|
|
if (ret)
|
|
goto restore;
|
|
} else {
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
|
|
btrfs_err(fs_info,
|
|
"Remounting read-write after error is not allowed");
|
|
ret = -EINVAL;
|
|
goto restore;
|
|
}
|
|
if (fs_info->fs_devices->rw_devices == 0) {
|
|
ret = -EACCES;
|
|
goto restore;
|
|
}
|
|
|
|
if (!btrfs_check_rw_degradable(fs_info, NULL)) {
|
|
btrfs_warn(fs_info,
|
|
"too many missing devices, writable remount is not allowed");
|
|
ret = -EACCES;
|
|
goto restore;
|
|
}
|
|
|
|
if (btrfs_super_log_root(fs_info->super_copy) != 0) {
|
|
btrfs_warn(fs_info,
|
|
"mount required to replay tree-log, cannot remount read-write");
|
|
ret = -EINVAL;
|
|
goto restore;
|
|
}
|
|
|
|
ret = btrfs_cleanup_fs_roots(fs_info);
|
|
if (ret)
|
|
goto restore;
|
|
|
|
/* recover relocation */
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
ret = btrfs_recover_relocation(root);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
if (ret)
|
|
goto restore;
|
|
|
|
ret = btrfs_resume_balance_async(fs_info);
|
|
if (ret)
|
|
goto restore;
|
|
|
|
ret = btrfs_resume_dev_replace_async(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "failed to resume dev_replace");
|
|
goto restore;
|
|
}
|
|
|
|
btrfs_qgroup_rescan_resume(fs_info);
|
|
|
|
if (!fs_info->uuid_root) {
|
|
btrfs_info(fs_info, "creating UUID tree");
|
|
ret = btrfs_create_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create the UUID tree %d",
|
|
ret);
|
|
goto restore;
|
|
}
|
|
}
|
|
sb->s_flags &= ~SB_RDONLY;
|
|
|
|
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
}
|
|
out:
|
|
/*
|
|
* We need to set SB_I_VERSION here otherwise it'll get cleared by VFS,
|
|
* since the absence of the flag means it can be toggled off by remount.
|
|
*/
|
|
*flags |= SB_I_VERSION;
|
|
|
|
wake_up_process(fs_info->transaction_kthread);
|
|
btrfs_remount_cleanup(fs_info, old_opts);
|
|
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
|
|
|
|
return 0;
|
|
|
|
restore:
|
|
/* We've hit an error - don't reset SB_RDONLY */
|
|
if (sb_rdonly(sb))
|
|
old_flags |= SB_RDONLY;
|
|
sb->s_flags = old_flags;
|
|
fs_info->mount_opt = old_opts;
|
|
fs_info->compress_type = old_compress_type;
|
|
fs_info->max_inline = old_max_inline;
|
|
btrfs_resize_thread_pool(fs_info,
|
|
old_thread_pool_size, fs_info->thread_pool_size);
|
|
fs_info->metadata_ratio = old_metadata_ratio;
|
|
btrfs_remount_cleanup(fs_info, old_opts);
|
|
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Used to sort the devices by max_avail(descending sort) */
|
|
static inline int btrfs_cmp_device_free_bytes(const void *dev_info1,
|
|
const void *dev_info2)
|
|
{
|
|
if (((struct btrfs_device_info *)dev_info1)->max_avail >
|
|
((struct btrfs_device_info *)dev_info2)->max_avail)
|
|
return -1;
|
|
else if (((struct btrfs_device_info *)dev_info1)->max_avail <
|
|
((struct btrfs_device_info *)dev_info2)->max_avail)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sort the devices by max_avail, in which max free extent size of each device
|
|
* is stored.(Descending Sort)
|
|
*/
|
|
static inline void btrfs_descending_sort_devices(
|
|
struct btrfs_device_info *devices,
|
|
size_t nr_devices)
|
|
{
|
|
sort(devices, nr_devices, sizeof(struct btrfs_device_info),
|
|
btrfs_cmp_device_free_bytes, NULL);
|
|
}
|
|
|
|
/*
|
|
* The helper to calc the free space on the devices that can be used to store
|
|
* file data.
|
|
*/
|
|
static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
|
|
u64 *free_bytes)
|
|
{
|
|
struct btrfs_device_info *devices_info;
|
|
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
|
|
struct btrfs_device *device;
|
|
u64 type;
|
|
u64 avail_space;
|
|
u64 min_stripe_size;
|
|
int num_stripes = 1;
|
|
int i = 0, nr_devices;
|
|
const struct btrfs_raid_attr *rattr;
|
|
|
|
/*
|
|
* We aren't under the device list lock, so this is racy-ish, but good
|
|
* enough for our purposes.
|
|
*/
|
|
nr_devices = fs_info->fs_devices->open_devices;
|
|
if (!nr_devices) {
|
|
smp_mb();
|
|
nr_devices = fs_info->fs_devices->open_devices;
|
|
ASSERT(nr_devices);
|
|
if (!nr_devices) {
|
|
*free_bytes = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
|
|
GFP_KERNEL);
|
|
if (!devices_info)
|
|
return -ENOMEM;
|
|
|
|
/* calc min stripe number for data space allocation */
|
|
type = btrfs_data_alloc_profile(fs_info);
|
|
rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)];
|
|
|
|
if (type & BTRFS_BLOCK_GROUP_RAID0)
|
|
num_stripes = nr_devices;
|
|
else if (type & BTRFS_BLOCK_GROUP_RAID1)
|
|
num_stripes = 2;
|
|
else if (type & BTRFS_BLOCK_GROUP_RAID1C3)
|
|
num_stripes = 3;
|
|
else if (type & BTRFS_BLOCK_GROUP_RAID1C4)
|
|
num_stripes = 4;
|
|
else if (type & BTRFS_BLOCK_GROUP_RAID10)
|
|
num_stripes = 4;
|
|
|
|
/* Adjust for more than 1 stripe per device */
|
|
min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
|
|
&device->dev_state) ||
|
|
!device->bdev ||
|
|
test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
|
|
continue;
|
|
|
|
if (i >= nr_devices)
|
|
break;
|
|
|
|
avail_space = device->total_bytes - device->bytes_used;
|
|
|
|
/* align with stripe_len */
|
|
avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN);
|
|
|
|
/*
|
|
* In order to avoid overwriting the superblock on the drive,
|
|
* btrfs starts at an offset of at least 1MB when doing chunk
|
|
* allocation.
|
|
*
|
|
* This ensures we have at least min_stripe_size free space
|
|
* after excluding 1MB.
|
|
*/
|
|
if (avail_space <= SZ_1M + min_stripe_size)
|
|
continue;
|
|
|
|
avail_space -= SZ_1M;
|
|
|
|
devices_info[i].dev = device;
|
|
devices_info[i].max_avail = avail_space;
|
|
|
|
i++;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
nr_devices = i;
|
|
|
|
btrfs_descending_sort_devices(devices_info, nr_devices);
|
|
|
|
i = nr_devices - 1;
|
|
avail_space = 0;
|
|
while (nr_devices >= rattr->devs_min) {
|
|
num_stripes = min(num_stripes, nr_devices);
|
|
|
|
if (devices_info[i].max_avail >= min_stripe_size) {
|
|
int j;
|
|
u64 alloc_size;
|
|
|
|
avail_space += devices_info[i].max_avail * num_stripes;
|
|
alloc_size = devices_info[i].max_avail;
|
|
for (j = i + 1 - num_stripes; j <= i; j++)
|
|
devices_info[j].max_avail -= alloc_size;
|
|
}
|
|
i--;
|
|
nr_devices--;
|
|
}
|
|
|
|
kfree(devices_info);
|
|
*free_bytes = avail_space;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
|
|
*
|
|
* If there's a redundant raid level at DATA block groups, use the respective
|
|
* multiplier to scale the sizes.
|
|
*
|
|
* Unused device space usage is based on simulating the chunk allocator
|
|
* algorithm that respects the device sizes and order of allocations. This is
|
|
* a close approximation of the actual use but there are other factors that may
|
|
* change the result (like a new metadata chunk).
|
|
*
|
|
* If metadata is exhausted, f_bavail will be 0.
|
|
*/
|
|
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
struct btrfs_space_info *found;
|
|
u64 total_used = 0;
|
|
u64 total_free_data = 0;
|
|
u64 total_free_meta = 0;
|
|
int bits = dentry->d_sb->s_blocksize_bits;
|
|
__be32 *fsid = (__be32 *)fs_info->fs_devices->fsid;
|
|
unsigned factor = 1;
|
|
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
|
|
int ret;
|
|
u64 thresh = 0;
|
|
int mixed = 0;
|
|
|
|
list_for_each_entry(found, &fs_info->space_info, list) {
|
|
if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
|
|
int i;
|
|
|
|
total_free_data += found->disk_total - found->disk_used;
|
|
total_free_data -=
|
|
btrfs_account_ro_block_groups_free_space(found);
|
|
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
|
|
if (!list_empty(&found->block_groups[i]))
|
|
factor = btrfs_bg_type_to_factor(
|
|
btrfs_raid_array[i].bg_flag);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Metadata in mixed block goup profiles are accounted in data
|
|
*/
|
|
if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) {
|
|
if (found->flags & BTRFS_BLOCK_GROUP_DATA)
|
|
mixed = 1;
|
|
else
|
|
total_free_meta += found->disk_total -
|
|
found->disk_used;
|
|
}
|
|
|
|
total_used += found->disk_used;
|
|
}
|
|
|
|
buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor);
|
|
buf->f_blocks >>= bits;
|
|
buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits);
|
|
|
|
/* Account global block reserve as used, it's in logical size already */
|
|
spin_lock(&block_rsv->lock);
|
|
/* Mixed block groups accounting is not byte-accurate, avoid overflow */
|
|
if (buf->f_bfree >= block_rsv->size >> bits)
|
|
buf->f_bfree -= block_rsv->size >> bits;
|
|
else
|
|
buf->f_bfree = 0;
|
|
spin_unlock(&block_rsv->lock);
|
|
|
|
buf->f_bavail = div_u64(total_free_data, factor);
|
|
ret = btrfs_calc_avail_data_space(fs_info, &total_free_data);
|
|
if (ret)
|
|
return ret;
|
|
buf->f_bavail += div_u64(total_free_data, factor);
|
|
buf->f_bavail = buf->f_bavail >> bits;
|
|
|
|
/*
|
|
* We calculate the remaining metadata space minus global reserve. If
|
|
* this is (supposedly) smaller than zero, there's no space. But this
|
|
* does not hold in practice, the exhausted state happens where's still
|
|
* some positive delta. So we apply some guesswork and compare the
|
|
* delta to a 4M threshold. (Practically observed delta was ~2M.)
|
|
*
|
|
* We probably cannot calculate the exact threshold value because this
|
|
* depends on the internal reservations requested by various
|
|
* operations, so some operations that consume a few metadata will
|
|
* succeed even if the Avail is zero. But this is better than the other
|
|
* way around.
|
|
*/
|
|
thresh = SZ_4M;
|
|
|
|
/*
|
|
* We only want to claim there's no available space if we can no longer
|
|
* allocate chunks for our metadata profile and our global reserve will
|
|
* not fit in the free metadata space. If we aren't ->full then we
|
|
* still can allocate chunks and thus are fine using the currently
|
|
* calculated f_bavail.
|
|
*/
|
|
if (!mixed && block_rsv->space_info->full &&
|
|
total_free_meta - thresh < block_rsv->size)
|
|
buf->f_bavail = 0;
|
|
|
|
buf->f_type = BTRFS_SUPER_MAGIC;
|
|
buf->f_bsize = dentry->d_sb->s_blocksize;
|
|
buf->f_namelen = BTRFS_NAME_LEN;
|
|
|
|
/* We treat it as constant endianness (it doesn't matter _which_)
|
|
because we want the fsid to come out the same whether mounted
|
|
on a big-endian or little-endian host */
|
|
buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
|
|
buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
|
|
/* Mask in the root object ID too, to disambiguate subvols */
|
|
buf->f_fsid.val[0] ^=
|
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32;
|
|
buf->f_fsid.val[1] ^=
|
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_kill_super(struct super_block *sb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
kill_anon_super(sb);
|
|
btrfs_free_fs_info(fs_info);
|
|
}
|
|
|
|
static struct file_system_type btrfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "btrfs",
|
|
.mount = btrfs_mount,
|
|
.kill_sb = btrfs_kill_super,
|
|
.fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
|
|
};
|
|
|
|
static struct file_system_type btrfs_root_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "btrfs",
|
|
.mount = btrfs_mount_root,
|
|
.kill_sb = btrfs_kill_super,
|
|
.fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
|
|
};
|
|
|
|
MODULE_ALIAS_FS("btrfs");
|
|
|
|
static int btrfs_control_open(struct inode *inode, struct file *file)
|
|
{
|
|
/*
|
|
* The control file's private_data is used to hold the
|
|
* transaction when it is started and is used to keep
|
|
* track of whether a transaction is already in progress.
|
|
*/
|
|
file->private_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Used by /dev/btrfs-control for devices ioctls.
|
|
*/
|
|
static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct btrfs_ioctl_vol_args *vol;
|
|
struct btrfs_device *device = NULL;
|
|
int ret = -ENOTTY;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
vol = memdup_user((void __user *)arg, sizeof(*vol));
|
|
if (IS_ERR(vol))
|
|
return PTR_ERR(vol);
|
|
vol->name[BTRFS_PATH_NAME_MAX] = '\0';
|
|
|
|
switch (cmd) {
|
|
case BTRFS_IOC_SCAN_DEV:
|
|
mutex_lock(&uuid_mutex);
|
|
device = btrfs_scan_one_device(vol->name, FMODE_READ,
|
|
&btrfs_root_fs_type);
|
|
ret = PTR_ERR_OR_ZERO(device);
|
|
mutex_unlock(&uuid_mutex);
|
|
break;
|
|
case BTRFS_IOC_FORGET_DEV:
|
|
ret = btrfs_forget_devices(vol->name);
|
|
break;
|
|
case BTRFS_IOC_DEVICES_READY:
|
|
mutex_lock(&uuid_mutex);
|
|
device = btrfs_scan_one_device(vol->name, FMODE_READ,
|
|
&btrfs_root_fs_type);
|
|
if (IS_ERR(device)) {
|
|
mutex_unlock(&uuid_mutex);
|
|
ret = PTR_ERR(device);
|
|
break;
|
|
}
|
|
ret = !(device->fs_devices->num_devices ==
|
|
device->fs_devices->total_devices);
|
|
mutex_unlock(&uuid_mutex);
|
|
break;
|
|
case BTRFS_IOC_GET_SUPPORTED_FEATURES:
|
|
ret = btrfs_ioctl_get_supported_features((void __user*)arg);
|
|
break;
|
|
}
|
|
|
|
kfree(vol);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_freeze(struct super_block *sb)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
|
|
set_bit(BTRFS_FS_FROZEN, &fs_info->flags);
|
|
/*
|
|
* We don't need a barrier here, we'll wait for any transaction that
|
|
* could be in progress on other threads (and do delayed iputs that
|
|
* we want to avoid on a frozen filesystem), or do the commit
|
|
* ourselves.
|
|
*/
|
|
trans = btrfs_attach_transaction_barrier(root);
|
|
if (IS_ERR(trans)) {
|
|
/* no transaction, don't bother */
|
|
if (PTR_ERR(trans) == -ENOENT)
|
|
return 0;
|
|
return PTR_ERR(trans);
|
|
}
|
|
return btrfs_commit_transaction(trans);
|
|
}
|
|
|
|
static int btrfs_unfreeze(struct super_block *sb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
|
|
clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
|
|
struct btrfs_device *dev, *first_dev = NULL;
|
|
|
|
/*
|
|
* Lightweight locking of the devices. We should not need
|
|
* device_list_mutex here as we only read the device data and the list
|
|
* is protected by RCU. Even if a device is deleted during the list
|
|
* traversals, we'll get valid data, the freeing callback will wait at
|
|
* least until the rcu_read_unlock.
|
|
*/
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(dev, &fs_info->fs_devices->devices, dev_list) {
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
|
|
continue;
|
|
if (!dev->name)
|
|
continue;
|
|
if (!first_dev || dev->devid < first_dev->devid)
|
|
first_dev = dev;
|
|
}
|
|
|
|
if (first_dev)
|
|
seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
|
|
else
|
|
WARN_ON(1);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
static const struct super_operations btrfs_super_ops = {
|
|
.drop_inode = btrfs_drop_inode,
|
|
.evict_inode = btrfs_evict_inode,
|
|
.put_super = btrfs_put_super,
|
|
.sync_fs = btrfs_sync_fs,
|
|
.show_options = btrfs_show_options,
|
|
.show_devname = btrfs_show_devname,
|
|
.alloc_inode = btrfs_alloc_inode,
|
|
.destroy_inode = btrfs_destroy_inode,
|
|
.free_inode = btrfs_free_inode,
|
|
.statfs = btrfs_statfs,
|
|
.remount_fs = btrfs_remount,
|
|
.freeze_fs = btrfs_freeze,
|
|
.unfreeze_fs = btrfs_unfreeze,
|
|
};
|
|
|
|
static const struct file_operations btrfs_ctl_fops = {
|
|
.open = btrfs_control_open,
|
|
.unlocked_ioctl = btrfs_control_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice btrfs_misc = {
|
|
.minor = BTRFS_MINOR,
|
|
.name = "btrfs-control",
|
|
.fops = &btrfs_ctl_fops
|
|
};
|
|
|
|
MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
|
|
MODULE_ALIAS("devname:btrfs-control");
|
|
|
|
static int __init btrfs_interface_init(void)
|
|
{
|
|
return misc_register(&btrfs_misc);
|
|
}
|
|
|
|
static __cold void btrfs_interface_exit(void)
|
|
{
|
|
misc_deregister(&btrfs_misc);
|
|
}
|
|
|
|
static void __init btrfs_print_mod_info(void)
|
|
{
|
|
static const char options[] = ""
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
", debug=on"
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_ASSERT
|
|
", assert=on"
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
", integrity-checker=on"
|
|
#endif
|
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
|
|
", ref-verify=on"
|
|
#endif
|
|
;
|
|
pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options);
|
|
}
|
|
|
|
static int __init init_btrfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
btrfs_props_init();
|
|
|
|
err = btrfs_init_sysfs();
|
|
if (err)
|
|
return err;
|
|
|
|
btrfs_init_compress();
|
|
|
|
err = btrfs_init_cachep();
|
|
if (err)
|
|
goto free_compress;
|
|
|
|
err = extent_io_init();
|
|
if (err)
|
|
goto free_cachep;
|
|
|
|
err = extent_state_cache_init();
|
|
if (err)
|
|
goto free_extent_io;
|
|
|
|
err = extent_map_init();
|
|
if (err)
|
|
goto free_extent_state_cache;
|
|
|
|
err = ordered_data_init();
|
|
if (err)
|
|
goto free_extent_map;
|
|
|
|
err = btrfs_delayed_inode_init();
|
|
if (err)
|
|
goto free_ordered_data;
|
|
|
|
err = btrfs_auto_defrag_init();
|
|
if (err)
|
|
goto free_delayed_inode;
|
|
|
|
err = btrfs_delayed_ref_init();
|
|
if (err)
|
|
goto free_auto_defrag;
|
|
|
|
err = btrfs_prelim_ref_init();
|
|
if (err)
|
|
goto free_delayed_ref;
|
|
|
|
err = btrfs_end_io_wq_init();
|
|
if (err)
|
|
goto free_prelim_ref;
|
|
|
|
err = btrfs_interface_init();
|
|
if (err)
|
|
goto free_end_io_wq;
|
|
|
|
btrfs_init_lockdep();
|
|
|
|
btrfs_print_mod_info();
|
|
|
|
err = btrfs_run_sanity_tests();
|
|
if (err)
|
|
goto unregister_ioctl;
|
|
|
|
err = register_filesystem(&btrfs_fs_type);
|
|
if (err)
|
|
goto unregister_ioctl;
|
|
|
|
return 0;
|
|
|
|
unregister_ioctl:
|
|
btrfs_interface_exit();
|
|
free_end_io_wq:
|
|
btrfs_end_io_wq_exit();
|
|
free_prelim_ref:
|
|
btrfs_prelim_ref_exit();
|
|
free_delayed_ref:
|
|
btrfs_delayed_ref_exit();
|
|
free_auto_defrag:
|
|
btrfs_auto_defrag_exit();
|
|
free_delayed_inode:
|
|
btrfs_delayed_inode_exit();
|
|
free_ordered_data:
|
|
ordered_data_exit();
|
|
free_extent_map:
|
|
extent_map_exit();
|
|
free_extent_state_cache:
|
|
extent_state_cache_exit();
|
|
free_extent_io:
|
|
extent_io_exit();
|
|
free_cachep:
|
|
btrfs_destroy_cachep();
|
|
free_compress:
|
|
btrfs_exit_compress();
|
|
btrfs_exit_sysfs();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
{
|
|
btrfs_destroy_cachep();
|
|
btrfs_delayed_ref_exit();
|
|
btrfs_auto_defrag_exit();
|
|
btrfs_delayed_inode_exit();
|
|
btrfs_prelim_ref_exit();
|
|
ordered_data_exit();
|
|
extent_map_exit();
|
|
extent_state_cache_exit();
|
|
extent_io_exit();
|
|
btrfs_interface_exit();
|
|
btrfs_end_io_wq_exit();
|
|
unregister_filesystem(&btrfs_fs_type);
|
|
btrfs_exit_sysfs();
|
|
btrfs_cleanup_fs_uuids();
|
|
btrfs_exit_compress();
|
|
}
|
|
|
|
late_initcall(init_btrfs_fs);
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_SOFTDEP("pre: crc32c");
|
|
MODULE_SOFTDEP("pre: xxhash64");
|
|
MODULE_SOFTDEP("pre: sha256");
|
|
MODULE_SOFTDEP("pre: blake2b-256");
|