diff options
| author | Ewan D. Milne <emilne@redhat.com> | 2020-03-11 10:39:30 -0400 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-03-11 23:09:27 -0400 |
| commit | b0962c53bde9a485c8ebc401fa1dbe821a76bc3e (patch) | |
| tree | d213766f82a9f2647832fab78c4f980e1bae96a3 | |
| parent | dade67f4a5277b3dbb375e537f088ee4a8e8bf4e (diff) | |
scsi: core: avoid repetitive logging of device offline messages
Large queues of I/O to offline devices that are eventually submitted when
devices are unblocked result in a many repeated "rejecting I/O to offline
device" messages. These messages can fill up the dmesg buffer in crash
dumps so no useful prior messages remain. In addition, if a serial console
is used, the flood of messages can cause a hard lockup in the console code.
Introduce a flag indicating the message has already been logged for the
device, and reset the flag when scsi_device_set_state() changes the device
state.
Link: https://lore.kernel.org/r/20200311143930.20674-1-emilne@redhat.com
Reviewed-by: Bart van Assche <bvanassche@acm.org>
Signed-off-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 8 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 3 |
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 9f201194c46a..47835c4b4ee0 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1215,8 +1215,11 @@ scsi_prep_state_check(struct scsi_device *sdev, struct request *req) * commands. The device must be brought online * before trying any recovery commands. */ - sdev_printk(KERN_ERR, sdev, - "rejecting I/O to offline device\n"); + if (!sdev->offline_already) { + sdev->offline_already = true; + sdev_printk(KERN_ERR, sdev, + "rejecting I/O to offline device\n"); + } return BLK_STS_IOERR; case SDEV_DEL: /* @@ -2326,6 +2329,7 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state) break; } + sdev->offline_already = false; sdev->sdev_state = state; return 0; diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 579e24c92f2f..c3cba2aaf934 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -203,6 +203,9 @@ struct scsi_device { unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device * creation time */ + + bool offline_already; /* Device offline message logged */ + atomic_t disk_events_disable_depth; /* disable depth for disk events */ DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ |