[0/2] netfs, ceph: fix the crash when unlocking the folio

From: Xiubo Li <xiubli@redhat.com>

kernel: page:00000000c9746ff1 refcount:2 mapcount:0 mapping:00000000dc2785bb index:0x1 pfn:0x141afc
kernel: memcg:ffff88810f766000
kernel: aops:ceph_aops [ceph] ino:100000005e7 dentry name:"postgresql-Fri.log" 
kernel: flags: 0x5ffc000000201c(uptodate|dirty|lru|private|node=0|zone=2|lastcpupid=0x7ff)
kernel: raw: 005ffc000000201c ffffea000a9eeb48 ffffea00060ade48 ffff888193ed8228
kernel: raw: 0000000000000001 ffff88810cc96500 00000002ffffffff ffff88810f766000
kernel: page dumped because: VM_BUG_ON_FOLIO(!folio_test_locked(folio))
kernel: ------------[ cut here ]------------
kernel: kernel BUG at mm/filemap.c:1559!
kernel: invalid opcode: 0000 [#1] PREEMPT SMP PTI
kernel: CPU: 4 PID: 131697 Comm: postmaster Tainted: G S                5.19.0-rc2-ceph-g822a4c74e05d #1
kernel: Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 2.0 12/17/2015
kernel: RIP: 0010:folio_unlock+0x26/0x30
kernel: Code: 00 0f 1f 00 0f 1f 44 00 00 48 8b 07 a8 01 74 0e f0 80 27 fe 78 01 c3 31 f6 e9 d6 fe ff ff 48 c7 c6 c0 81 37 82 e8 aa 64 04 00 <0f> 0b 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 b8 01 00 00
kernel: RSP: 0018:ffffc90004377bc8 EFLAGS: 00010246
kernel: RAX: 000000000000003f RBX: ffff888193ed8228 RCX: 0000000000000001
kernel: RDX: 0000000000000000 RSI: ffffffff823a3569 RDI: 00000000ffffffff
kernel: RBP: ffffffff828a0058 R08: 0000000000000001 R09: 0000000000000001
kernel: R10: 000000007c6b0fd2 R11: 0000000000000034 R12: 0000000000000001
kernel: R13: 00000000fffffe00 R14: ffffea000506bf00 R15: ffff888193ed8000
kernel: FS:  00007f4993626340(0000) GS:ffff88885fd00000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 0000555789ee8000 CR3: 000000017a52a006 CR4: 00000000001706e0
kernel: Call Trace:
kernel: <TASK>
kernel: netfs_write_begin+0x130/0x950 [netfs]
kernel: ceph_write_begin+0x46/0xd0 [ceph]
kernel: generic_perform_write+0xef/0x200
kernel: ? file_update_time+0xd4/0x110
kernel: ceph_write_iter+0xb01/0xcd0 [ceph]
kernel: ? lock_is_held_type+0xe3/0x140
kernel: ? new_sync_write+0x106/0x180
kernel: new_sync_write+0x106/0x180
kernel: vfs_write+0x29a/0x3a0
kernel: ksys_write+0x5c/0xd0
kernel: do_syscall_64+0x34/0x80
kernel: entry_SYSCALL_64_after_hwframe+0x46/0xb0
kernel: RIP: 0033:0x7f49903205c8
kernel: Code: 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 8d 05 d5 3f 2a 00 8b 00 85 c0 75 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 41 54 49 89 d4 55
kernel: RSP: 002b:00007fff104bd178 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
kernel: RAX: ffffffffffffffda RBX: 0000000000000048 RCX: 00007f49903205c8
kernel: RDX: 0000000000000048 RSI: 000055944d3c1ea0 RDI: 000000000000000b
kernel: RBP: 000055944d3c1ea0 R08: 000055944d3963d0 R09: 00007fff1055b080
kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 000055944d3962f0
kernel: R13: 0000000000000048 R14: 00007f49905bb880 R15: 0000000000000048
kernel: </TASK>


Xiubo Li (2):
  netfs: release the folio lock and put the folio before retrying
  ceph: do not release the folio lock in kceph

 fs/ceph/addr.c           | 6 +++---
 fs/netfs/buffered_read.c | 5 ++++-
 2 files changed, 7 insertions(+), 4 deletions(-)