diff options
| author |   Uday Shankar <ushankar@purestorage.com> | 2022-09-23 18:02:42 -0600 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2022-10-18 02:26:29 +0000 |
| commit | 2331ce6126be8864b39490e705286b66e2344aac (patch) | |
| tree | 2622c427146c4e2d39fa3425884aaa447ad843c8 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | Linux 6.1-rc1 (diff) | |
| download | linux-dev-2331ce6126be8864b39490e705286b66e2344aac.tar.xz linux-dev-2331ce6126be8864b39490e705286b66e2344aac.zip | |
scsi: core: Restrict legal sdev_state transitions via sysfs
Userspace can currently write to sysfs to transition sdev_state to RUNNING
or OFFLINE from any source state. This causes issues because proper
transitioning out of some states involves steps besides just changing
sdev_state, so allowing userspace to change sdev_state regardless of the
source state can result in inconsistencies; e.g. with ISCSI we can end up
with sdev_state == SDEV_RUNNING while the device queue is quiesced. Any
task attempting I/O on the device will then hang, and in more recent
kernels, iscsid will hang as well.
More detail about this bug is provided in my first attempt:
https://groups.google.com/g/open-iscsi/c/PNKca4HgPDs/m/CXaDkntOAQAJ
Link: https://lore.kernel.org/r/20220924000241.2967323-1-ushankar@purestorage.com
Signed-off-by: Uday Shankar <ushankar@purestorage.com>
Suggested-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions