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[SCSI] sr,sd: send media state change modification events 

This will send for a card reader slot (remove/add media):
  UEVENT[1187091572.155884] change   /devices/pci0000:00/0000:00:1d.7/usb5/5-2/5-2:1.0/host7/target7:0:0/7:0:0:0 (scsi)
  UEVENT[1187091572.162314] remove   /block/sdb/sdb1 (block)
  UEVENT[1187091572.172464] add      /block/sdb/sdb1 (block)
  UEVENT[1187091572.175408] change   /devices/pci0000:00/0000:00:1d.7/usb5/5-2/5-2:1.0/host7/target7:0:0/7:0:0:0 (scsi)

and for a DVD drive (add/eject media):
  UEVENT[1187091590.189159] change   /devices/pci0000:00/0000:00:1f.1/host4/target4:0:0/4:0:0:0 (scsi)
  UEVENT[1187091590.957124] add      /module/isofs (module)
  UEVENT[1187091604.468207] change   /devices/pci0000:00/0000:00:1f.1/host4/target4:0:0/4:0:0:0 (scsi)

Userspace gets events, even for unpartitioned media. This unifies
the event handling for asynchronoous events (AN) and events caused by
perodical polling the device from userspace.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>

[jejb: modified for new event API]

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
hifive-unleashed-5.1
Kay Sievers 2007-08-14 14:10:39 +02:00 committed by James Bottomley
parent d0c4c9d4a2
commit 285e9670d9
4 changed files with 28 additions and 12 deletions
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24
drivers/scsi/sd.c
View File

@ -749,8 +749,11 @@ static int sd_media_changed(struct gendisk *disk)
* can deal with it then. It is only because of unrecoverable errors
* that we would ever take a device offline in the first place.
*/
if (!scsi_device_online(sdp))
goto not_present;
if (!scsi_device_online(sdp)) {
set_media_not_present(sdkp);
retval = 1;
goto out;
}
/*
* Using TEST_UNIT_READY enables differentiation between drive with
@ -762,6 +765,7 @@ static int sd_media_changed(struct gendisk *disk)
* sd_revalidate() is called.
*/
retval = -ENODEV;
if (scsi_block_when_processing_errors(sdp))
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
@ -771,8 +775,11 @@ static int sd_media_changed(struct gendisk *disk)
* and we will figure it out later once the drive is
* available again.
*/
if (retval)
goto not_present;
if (retval) {
set_media_not_present(sdkp);
retval = 1;
goto out;
}
/*
* For removable scsi disk we have to recognise the presence
@ -783,12 +790,11 @@ static int sd_media_changed(struct gendisk *disk)
retval = sdp->changed;
sdp->changed = 0;
out:
if (retval != sdkp->previous_state)
sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
sdkp->previous_state = retval;
return retval;
not_present:
set_media_not_present(sdkp);
return 1;
}
static int sd_sync_cache(struct scsi_disk *sdkp)

14
drivers/scsi/sr.c
View File

@ -192,8 +192,9 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
* and we will figure it out later once the drive is
* available again. */
cd->device->changed = 1;
return 1; /* This will force a flush, if called from
* check_disk_change */
/* This will force a flush, if called from check_disk_change */
retval = 1;
goto out;
};
retval = cd->device->changed;
@ -203,9 +204,16 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
if (retval) {
/* check multisession offset etc */
sr_cd_check(cdi);
get_sectorsize(cd);
}
out:
/* Notify userspace, that media has changed. */
if (retval != cd->previous_state)
sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
GFP_KERNEL);
cd->previous_state = retval;
return retval;
}

1
drivers/scsi/sr.h
View File

@ -37,6 +37,7 @@ typedef struct scsi_cd {
unsigned xa_flag:1; /* CD has XA sectors ? */
unsigned readcd_known:1; /* drive supports READ_CD (0xbe) */
unsigned readcd_cdda:1; /* reading audio data using READ_CD */
unsigned previous_state:1; /* media has changed */
struct cdrom_device_info cdi;
/* We hold gendisk and scsi_device references on probe and use
* the refs on this kref to decide when to release them */

1
include/scsi/sd.h
View File

@ -41,6 +41,7 @@ struct scsi_disk {
u32 index;
u8 media_present;
u8 write_prot;
unsigned previous_state : 1;
unsigned WCE : 1; /* state of disk WCE bit */
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */