Commit 906d15fb authored by Christoph Hellwig's avatar Christoph Hellwig

scsi: split scsi_nonblockable_ioctl

The calling conventions for this function are bad as it could return
-ENODEV both for a device not currently online and a not recognized ioctl.

Add a new scsi_ioctl_block_when_processing_errors function that wraps
scsi_block_when_processing_errors with the a special case for the
SG_SCSI_RESET ioctl command, and handle the SG_SCSI_RESET case itself
in scsi_ioctl.  All callers of scsi_ioctl now must call the above helper
to check for the EH state, so that the ioctl handler itself doesn't
have to.
Reported-by: default avatarRobert Elliott <Elliott@hp.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
parent 176aa9d6
......@@ -616,6 +616,11 @@ static long ch_ioctl(struct file *file,
int retval;
void __user *argp = (void __user *)arg;
retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
file->f_flags & O_NDELAY);
if (retval)
return retval;
switch (cmd) {
case CHIOGPARAMS:
{
......
......@@ -4969,10 +4969,10 @@ static long osst_ioctl(struct file * file,
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
if( !scsi_block_when_processing_errors(STp->device) ) {
retval = (-ENXIO);
retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
file->f_flags & O_NDELAY);
if (retval)
goto out;
}
cmd_type = _IOC_TYPE(cmd_in);
cmd_nr = _IOC_NR(cmd_in);
......
......@@ -200,19 +200,6 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
{
char scsi_cmd[MAX_COMMAND_SIZE];
/* No idea how this happens.... */
if (!sdev)
return -ENXIO;
/*
* If we are in the middle of error recovery, don't let anyone
* else try and use this device. Also, if error recovery fails, it
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
if (!scsi_block_when_processing_errors(sdev))
return -ENODEV;
/* Check for deprecated ioctls ... all the ioctls which don't
* follow the new unique numbering scheme are deprecated */
switch (cmd) {
......@@ -273,6 +260,8 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
START_STOP_TIMEOUT, NORMAL_RETRIES);
case SCSI_IOCTL_GET_PCI:
return scsi_ioctl_get_pci(sdev, arg);
case SG_SCSI_RESET:
return scsi_ioctl_reset(sdev, arg);
default:
if (sdev->host->hostt->ioctl)
return sdev->host->hostt->ioctl(sdev, cmd, arg);
......@@ -281,30 +270,20 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
}
EXPORT_SYMBOL(scsi_ioctl);
/**
* scsi_nonblockable_ioctl() - Handle SG_SCSI_RESET
* @sdev: scsi device receiving ioctl
* @cmd: Must be SC_SCSI_RESET
* @arg: pointer to int containing SG_SCSI_RESET_{DEVICE,TARGET,BUS,HOST}
* possibly OR-ed with SG_SCSI_RESET_NO_ESCALATE
* @ndelay: file mode O_NDELAY flag
/*
* We can process a reset even when a device isn't fully operable.
*/
int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
void __user *arg, int ndelay)
int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd,
bool ndelay)
{
/* The first set of iocts may be executed even if we're doing
* error processing, as long as the device was opened
* non-blocking */
if (ndelay) {
if (cmd == SG_SCSI_RESET && ndelay) {
if (scsi_host_in_recovery(sdev->host))
return -ENODEV;
} else if (!scsi_block_when_processing_errors(sdev))
return -ENODEV;
switch (cmd) {
case SG_SCSI_RESET:
return scsi_ioctl_reset(sdev, arg);
} else {
if (!scsi_block_when_processing_errors(sdev))
return -ENODEV;
}
return -ENODEV;
return 0;
}
EXPORT_SYMBOL(scsi_nonblockable_ioctl);
EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
......@@ -1334,9 +1334,9 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
error = scsi_nonblockable_ioctl(sdp, cmd, p,
(mode & FMODE_NDELAY) != 0);
if (!scsi_block_when_processing_errors(sdp) || !error)
error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
(mode & FMODE_NDELAY) != 0);
if (error)
goto out;
/*
......
......@@ -1071,16 +1071,6 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
if (atomic_read(&sdp->detaching))
return -ENODEV;
return put_user(sdp->device->host->hostt->emulated, ip);
case SG_SCSI_RESET:
if (atomic_read(&sdp->detaching))
return -ENODEV;
if (filp->f_flags & O_NONBLOCK) {
if (scsi_host_in_recovery(sdp->device->host))
return -EBUSY;
} else if (!scsi_block_when_processing_errors(sdp->device))
return -EBUSY;
return scsi_ioctl_reset(sdp->device, ip);
case SCSI_IOCTL_SEND_COMMAND:
if (atomic_read(&sdp->detaching))
return -ENODEV;
......@@ -1100,13 +1090,6 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
return result;
sdp->sgdebug = (char) val;
return 0;
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
case SCSI_IOCTL_PROBE_HOST:
case SG_GET_TRANSFORM:
if (atomic_read(&sdp->detaching))
return -ENODEV;
return scsi_ioctl(sdp->device, cmd_in, p);
case BLKSECTGET:
return put_user(max_sectors_bytes(sdp->device->request_queue),
ip);
......@@ -1122,11 +1105,25 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
return blk_trace_startstop(sdp->device->request_queue, 0);
case BLKTRACETEARDOWN:
return blk_trace_remove(sdp->device->request_queue);
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
case SCSI_IOCTL_PROBE_HOST:
case SG_GET_TRANSFORM:
case SG_SCSI_RESET:
if (atomic_read(&sdp->detaching))
return -ENODEV;
break;
default:
if (read_only)
return -EPERM; /* don't know so take safe approach */
return scsi_ioctl(sdp->device, cmd_in, p);
break;
}
result = scsi_ioctl_block_when_processing_errors(sdp->device,
cmd_in, filp->f_flags & O_NDELAY);
if (result)
return result;
return scsi_ioctl(sdp->device, cmd_in, p);
}
#ifdef CONFIG_COMPAT
......
......@@ -549,6 +549,11 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
mutex_lock(&sr_mutex);
ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
(mode & FMODE_NDELAY) != 0);
if (ret)
goto out;
/*
* Send SCSI addressing ioctls directly to mid level, send other
* ioctls to cdrom/block level.
......@@ -564,16 +569,6 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
if (ret != -ENOSYS)
goto out;
/*
* ENODEV means that we didn't recognise the ioctl, or that we
* cannot execute it in the current device state. In either
* case fall through to scsi_ioctl, which will return ENDOEV again
* if it doesn't recognise the ioctl
*/
ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
(mode & FMODE_NDELAY) != 0);
if (ret != -ENODEV)
goto out;
ret = scsi_ioctl(sdev, cmd, argp);
out:
......
......@@ -3376,11 +3376,10 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
file->f_flags & O_NDELAY);
if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
file->f_flags & O_NDELAY);
if (retval)
goto out;
retval = 0;
cmd_type = _IOC_TYPE(cmd_in);
cmd_nr = _IOC_NR(cmd_in);
......
......@@ -40,9 +40,9 @@ typedef struct scsi_fctargaddress {
unsigned char host_wwn[8]; // include NULL term.
} Scsi_FCTargAddress;
int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev,
int cmd, bool ndelay);
extern int scsi_ioctl(struct scsi_device *, int, void __user *);
extern int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
void __user *arg, int ndelay);
#endif /* __KERNEL__ */
#endif /* _SCSI_IOCTL_H */
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