diff options
| author | Jan Kara <jack@suse.cz> | 2017-02-02 15:56:52 +0100 |
|---|---|---|
| committer | Ritesh Harjani <riteshh@codeaurora.org> | 2017-10-18 12:05:44 +0530 |
| commit | 9c197e78d2888e51936f5794ae9356ef42aca160 (patch) | |
| tree | fe2a1e8670db1d0327e9d32f6f512f879f980e5c /lib/mpi/mpi-internal.h | |
| parent | b56ec58cde8aa78d30f0af2f71c5ffcbe5def4ce (diff) | |
block: Make blk_get_backing_dev_info() safe without open bdev
Currenly blk_get_backing_dev_info() is not safe to be called when the
block device is not open as bdev->bd_disk is NULL in that case. However
inode_to_bdi() uses this function and may be call called from flusher
worker or other writeback related functions without bdev being open
which leads to crashes such as:
[113031.075540] Unable to handle kernel paging request for data at address 0x00000000
[113031.075614] Faulting instruction address: 0xc0000000003692e0
0:mon> t
[c0000000fb65f900] c00000000036cb6c writeback_sb_inodes+0x30c/0x590
[c0000000fb65fa10] c00000000036ced4 __writeback_inodes_wb+0xe4/0x150
[c0000000fb65fa70] c00000000036d33c wb_writeback+0x30c/0x450
[c0000000fb65fb40] c00000000036e198 wb_workfn+0x268/0x580
[c0000000fb65fc50] c0000000000f3470 process_one_work+0x1e0/0x590
[c0000000fb65fce0] c0000000000f38c8 worker_thread+0xa8/0x660
[c0000000fb65fd80] c0000000000fc4b0 kthread+0x110/0x130
[c0000000fb65fe30] c0000000000098f0 ret_from_kernel_thread+0x5c/0x6c
Signed-off-by: Jens Axboe <axboe@fb.com>
Change-Id: I26955b919bd05fe34dc60aab1797ea2739ad5fd7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
Git-commit: b1d2dc5659b41741f5a29b2ade76ffb4e5bb13d8
[riteshh@codeaurora.org: resolved merge conflicts]
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Diffstat (limited to 'lib/mpi/mpi-internal.h')
0 files changed, 0 insertions, 0 deletions