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scsi: use container_of to get at device handler private data

Browse source 
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig 2014-09-13 19:59:51 -07:00
parent 27c888f0bb
commit cd37743fc9
5 changed files with 37 additions and 61 deletions
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25
drivers/scsi/device_handler/scsi_dh_alua.c
View file

@ -62,6 +62,7 @@
#define ALUA_OPTIMIZE_STPG 1
struct alua_dh_data {
struct scsi_dh_data dh_data;
int group_id;
int rel_port;
int tpgs;
@ -87,9 +88,7 @@ static int alua_check_sense(struct scsi_device *, struct scsi_sense_hdr *);
static inline struct alua_dh_data *get_alua_data(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
BUG_ON(scsi_dh_data == NULL);
return ((struct alua_dh_data *) scsi_dh_data->buf);
return container_of(sdev->scsi_dh_data, struct alua_dh_data, dh_data);
}
static int realloc_buffer(struct alua_dh_data *h, unsigned len)
@ -846,21 +845,18 @@ static struct scsi_device_handler alua_dh = {
*/
static int alua_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct alua_dh_data *h;
unsigned long flags;
int err = SCSI_DH_OK;
scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
ALUA_DH_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &alua_dh;
h = (struct alua_dh_data *) scsi_dh_data->buf;
h->dh_data.scsi_dh = &alua_dh;
h->tpgs = TPGS_MODE_UNINITIALIZED;
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
@ -874,14 +870,14 @@ static int alua_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
return 0;
failed:
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n", ALUA_DH_NAME);
return -EINVAL;
}
@ -892,19 +888,16 @@ static int alua_bus_attach(struct scsi_device *sdev)
*/
static void alua_bus_detach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct alua_dh_data *h;
struct alua_dh_data *h = get_alua_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
h = (struct alua_dh_data *) scsi_dh_data->buf;
if (h->buff && h->inq != h->buff)
kfree(h->buff);
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", ALUA_DH_NAME);
}

24
drivers/scsi/device_handler/scsi_dh_emc.c
View file

@ -72,6 +72,7 @@ static const char * lun_state[] =
};
struct clariion_dh_data {
struct scsi_dh_data dh_data;
/*
* Flags:
* CLARIION_SHORT_TRESPASS
@ -116,9 +117,8 @@ struct clariion_dh_data {
static inline struct clariion_dh_data
*get_clariion_data(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
BUG_ON(scsi_dh_data == NULL);
return ((struct clariion_dh_data *) scsi_dh_data->buf);
return container_of(sdev->scsi_dh_data, struct clariion_dh_data,
dh_data);
}
/*
@ -665,21 +665,18 @@ static struct scsi_device_handler clariion_dh = {
static int clariion_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct clariion_dh_data *h;
unsigned long flags;
int err;
scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
CLARIION_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &clariion_dh;
h = (struct clariion_dh_data *) scsi_dh_data->buf;
h->dh_data.scsi_dh = &clariion_dh;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
@ -693,7 +690,7 @@ static int clariion_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev,
@ -705,7 +702,7 @@ static int clariion_bus_attach(struct scsi_device *sdev)
return 0;
failed:
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
CLARIION_NAME);
return -EINVAL;
@ -713,18 +710,17 @@ static int clariion_bus_attach(struct scsi_device *sdev)
static void clariion_bus_detach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct clariion_dh_data *h = get_clariion_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
CLARIION_NAME);
kfree(scsi_dh_data);
kfree(h);
}
static int __init clariion_init(void)

23
drivers/scsi/device_handler/scsi_dh_hp_sw.c
View file

@ -38,6 +38,7 @@
#define HP_SW_PATH_PASSIVE 1
struct hp_sw_dh_data {
struct scsi_dh_data dh_data;
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
int path_state;
int retries;
@ -51,9 +52,7 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *);
static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
BUG_ON(scsi_dh_data == NULL);
return ((struct hp_sw_dh_data *) scsi_dh_data->buf);
return container_of(sdev->scsi_dh_data, struct hp_sw_dh_data, dh_data);
}
/*
@ -354,21 +353,18 @@ static struct scsi_device_handler hp_sw_dh = {
static int hp_sw_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct hp_sw_dh_data *h;
unsigned long flags;
int ret;
scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n",
HP_SW_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &hp_sw_dh;
h = (struct hp_sw_dh_data *) scsi_dh_data->buf;
h->dh_data.scsi_dh = &hp_sw_dh;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
@ -378,7 +374,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
goto failed;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
@ -388,7 +384,7 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
return 0;
failed:
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
HP_SW_NAME);
return -EINVAL;
@ -396,17 +392,16 @@ static int hp_sw_bus_attach(struct scsi_device *sdev)
static void hp_sw_bus_detach( struct scsi_device *sdev )
{
struct scsi_dh_data *scsi_dh_data;
struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
unsigned long flags;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME);
kfree(scsi_dh_data);
kfree(h);
}
static int __init hp_sw_init(void)

25
drivers/scsi/device_handler/scsi_dh_rdac.c
View file

@ -181,6 +181,7 @@ struct c2_inquiry {
};
struct rdac_dh_data {
struct scsi_dh_data dh_data;
struct rdac_controller *ctlr;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
@ -261,9 +262,7 @@ do { \
static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
BUG_ON(scsi_dh_data == NULL);
return ((struct rdac_dh_data *) scsi_dh_data->buf);
return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data);
}
static struct request *get_rdac_req(struct scsi_device *sdev,
@ -842,23 +841,20 @@ static struct scsi_device_handler rdac_dh = {
static int rdac_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;
struct rdac_dh_data *h;
unsigned long flags;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
+ sizeof(*h) , GFP_KERNEL);
if (!scsi_dh_data) {
h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
RDAC_NAME);
return -ENOMEM;
}
scsi_dh_data->scsi_dh = &rdac_dh;
h = (struct rdac_dh_data *) scsi_dh_data->buf;
h->dh_data.scsi_dh = &rdac_dh;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
@ -879,7 +875,7 @@ static int rdac_bus_attach(struct scsi_device *sdev)
goto clean_ctlr;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev,
@ -895,7 +891,7 @@ static int rdac_bus_attach(struct scsi_device *sdev)
spin_unlock(&list_lock);
failed:
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
RDAC_NAME);
return -EINVAL;
@ -903,12 +899,9 @@ static int rdac_bus_attach(struct scsi_device *sdev)
static void rdac_bus_detach( struct scsi_device *sdev )
{
struct scsi_dh_data *scsi_dh_data;
struct rdac_dh_data *h;
struct rdac_dh_data *h = get_rdac_data(sdev);
unsigned long flags;
scsi_dh_data = sdev->scsi_dh_data;
h = (struct rdac_dh_data *) scsi_dh_data->buf;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
@ -920,7 +913,7 @@ static void rdac_bus_detach( struct scsi_device *sdev )
if (h->ctlr)
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
kfree(scsi_dh_data);
kfree(h);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
}

1
include/scsi/scsi_device.h
View file

@ -228,7 +228,6 @@ struct scsi_dh_data {
struct scsi_device_handler *scsi_dh;
struct scsi_device *sdev;
struct kref kref;
char buf[0];
};
#define to_scsi_device(d) \