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[PATCH] cciss: new disk register/deregister routines 

This patch removes a couple of functions dealing with configuration and
replaces them with new functions.  This implementation fixes some bugs
associated with the ACUXE.  It also allows a logical volume to be removed from
the middle without deleting all volumes behind it.

If a user has 5 logical volumes and decides he wants to reconfigure volume
number 3, he can now do that without removing volumes 4 & 5 first.  This code
has been tested in our labs against all application software.

Signed-off-by: Chase Maupin <chase.maupin@hp.com>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Miller 2005-09-13 01:25:22 -07:00 коммит произвёл Linus Torvalds
Родитель 1f8ef3806c
Коммит ddd474420a
2 изменённых файлов: 334 добавлений и 191 удалений
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517
drivers/block/cciss.c
Просмотреть файл

@ -155,15 +155,24 @@ static int cciss_ioctl(struct inode *inode, struct file *filep,
static int revalidate_allvol(ctlr_info_t *host);
static int cciss_revalidate(struct gendisk *disk);
static int deregister_disk(struct gendisk *disk);
static int register_new_disk(ctlr_info_t *h);
static int rebuild_lun_table(ctlr_info_t *h, struct gendisk *del_disk);
static int deregister_disk(struct gendisk *disk, drive_info_struct *drv, int clear_all);
static void cciss_read_capacity(int ctlr, int logvol, ReadCapdata_struct *buf,
int withirq, unsigned int *total_size, unsigned int *block_size);
static void cciss_geometry_inquiry(int ctlr, int logvol,
int withirq, unsigned int total_size,
unsigned int block_size, InquiryData_struct *inq_buff,
drive_info_struct *drv);
static void cciss_getgeometry(int cntl_num);
static void start_io( ctlr_info_t *h);
static int sendcmd( __u8 cmd, int ctlr, void *buff, size_t size,
unsigned int use_unit_num, unsigned int log_unit, __u8 page_code,
unsigned char *scsi3addr, int cmd_type);
static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
unsigned int use_unit_num, unsigned int log_unit, __u8 page_code,
int cmd_type);
#ifdef CONFIG_PROC_FS
static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
@ -280,7 +289,7 @@ static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
for(i=0; i<=h->highest_lun; i++) {
drv = &h->drv[i];
if (drv->block_size == 0)
if (drv->heads == 0)
continue;
vol_sz = drv->nr_blocks;
@ -471,6 +480,8 @@ static int cciss_open(struct inode *inode, struct file *filep)
if (host->busy_initializing)
return -EBUSY;
if (host->busy_initializing || drv->busy_configuring)
return -EBUSY;
/*
* Root is allowed to open raw volume zero even if it's not configured
* so array config can still work. Root is also allowed to open any
@ -814,10 +825,10 @@ static int cciss_ioctl(struct inode *inode, struct file *filep,
return(0);
}
case CCISS_DEREGDISK:
return deregister_disk(disk);
return rebuild_lun_table(host, disk);
case CCISS_REGNEWD:
return register_new_disk(host);
return rebuild_lun_table(host, NULL);
case CCISS_PASSTHRU:
{
@ -1161,48 +1172,323 @@ static int revalidate_allvol(ctlr_info_t *host)
return 0;
}
static int deregister_disk(struct gendisk *disk)
/* This function will check the usage_count of the drive to be updated/added.
* If the usage_count is zero then the drive information will be updated and
* the disk will be re-registered with the kernel. If not then it will be
* left alone for the next reboot. The exception to this is disk 0 which
* will always be left registered with the kernel since it is also the
* controller node. Any changes to disk 0 will show up on the next
* reboot.
*/
static void cciss_update_drive_info(int ctlr, int drv_index)
{
ctlr_info_t *h = hba[ctlr];
struct gendisk *disk;
ReadCapdata_struct *size_buff = NULL;
InquiryData_struct *inq_buff = NULL;
unsigned int block_size;
unsigned int total_size;
unsigned long flags = 0;
int ret = 0;
/* if the disk already exists then deregister it before proceeding*/
if (h->drv[drv_index].raid_level != -1){
spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
h->drv[drv_index].busy_configuring = 1;
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
ret = deregister_disk(h->gendisk[drv_index],
&h->drv[drv_index], 0);
h->drv[drv_index].busy_configuring = 0;
}
/* If the disk is in use return */
if (ret)
return;
/* Get information about the disk and modify the driver sturcture */
size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
if (size_buff == NULL)
goto mem_msg;
inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
if (inq_buff == NULL)
goto mem_msg;
cciss_read_capacity(ctlr, drv_index, size_buff, 1,
&total_size, &block_size);
cciss_geometry_inquiry(ctlr, drv_index, 1, total_size, block_size,
inq_buff, &h->drv[drv_index]);
++h->num_luns;
disk = h->gendisk[drv_index];
set_capacity(disk, h->drv[drv_index].nr_blocks);
/* if it's the controller it's already added */
if (drv_index){
disk->queue = blk_init_queue(do_cciss_request, &h->lock);
/* Set up queue information */
disk->queue->backing_dev_info.ra_pages = READ_AHEAD;
blk_queue_bounce_limit(disk->queue, hba[ctlr]->pdev->dma_mask);
/* This is a hardware imposed limit. */
blk_queue_max_hw_segments(disk->queue, MAXSGENTRIES);
/* This is a limit in the driver and could be eliminated. */
blk_queue_max_phys_segments(disk->queue, MAXSGENTRIES);
blk_queue_max_sectors(disk->queue, 512);
disk->queue->queuedata = hba[ctlr];
blk_queue_hardsect_size(disk->queue,
hba[ctlr]->drv[drv_index].block_size);
h->drv[drv_index].queue = disk->queue;
add_disk(disk);
}
freeret:
kfree(size_buff);
kfree(inq_buff);
return;
mem_msg:
printk(KERN_ERR "cciss: out of memory\n");
goto freeret;
}
/* This function will find the first index of the controllers drive array
* that has a -1 for the raid_level and will return that index. This is
* where new drives will be added. If the index to be returned is greater
* than the highest_lun index for the controller then highest_lun is set
* to this new index. If there are no available indexes then -1 is returned.
*/
static int cciss_find_free_drive_index(int ctlr)
{
int i;
for (i=0; i < CISS_MAX_LUN; i++){
if (hba[ctlr]->drv[i].raid_level == -1){
if (i > hba[ctlr]->highest_lun)
hba[ctlr]->highest_lun = i;
return i;
}
}
return -1;
}
/* This function will add and remove logical drives from the Logical
* drive array of the controller and maintain persistancy of ordering
* so that mount points are preserved until the next reboot. This allows
* for the removal of logical drives in the middle of the drive array
* without a re-ordering of those drives.
* INPUT
* h = The controller to perform the operations on
* del_disk = The disk to remove if specified. If the value given
* is NULL then no disk is removed.
*/
static int rebuild_lun_table(ctlr_info_t *h, struct gendisk *del_disk)
{
unsigned long flags;
ctlr_info_t *h = get_host(disk);
drive_info_struct *drv = get_drv(disk);
int ctlr = h->ctlr;
int num_luns;
ReportLunData_struct *ld_buff = NULL;
drive_info_struct *drv = NULL;
int return_code;
int listlength = 0;
int i;
int drv_found;
int drv_index = 0;
__u32 lunid = 0;
unsigned long flags;
/* Set busy_configuring flag for this operation */
spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
if (h->num_luns >= CISS_MAX_LUN){
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
return -EINVAL;
}
if (h->busy_configuring){
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
return -EBUSY;
}
h->busy_configuring = 1;
/* if del_disk is NULL then we are being called to add a new disk
* and update the logical drive table. If it is not NULL then
* we will check if the disk is in use or not.
*/
if (del_disk != NULL){
drv = get_drv(del_disk);
drv->busy_configuring = 1;
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
return_code = deregister_disk(del_disk, drv, 1);
drv->busy_configuring = 0;
h->busy_configuring = 0;
return return_code;
} else {
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
ld_buff = kzalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
if (ld_buff == NULL)
goto mem_msg;
return_code = sendcmd_withirq(CISS_REPORT_LOG, ctlr, ld_buff,
sizeof(ReportLunData_struct), 0, 0, 0,
TYPE_CMD);
if (return_code == IO_OK){
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[0])) << 24;
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[1])) << 16;
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[2])) << 8;
listlength |= 0xff & (unsigned int)(ld_buff->LUNListLength[3]);
} else{ /* reading number of logical volumes failed */
printk(KERN_WARNING "cciss: report logical volume"
" command failed\n");
listlength = 0;
goto freeret;
}
num_luns = listlength / 8; /* 8 bytes per entry */
if (num_luns > CISS_MAX_LUN){
num_luns = CISS_MAX_LUN;
printk(KERN_WARNING "cciss: more luns configured"
" on controller than can be handled by"
" this driver.\n");
}
/* Compare controller drive array to drivers drive array.
* Check for updates in the drive information and any new drives
* on the controller.
*/
for (i=0; i < num_luns; i++){
int j;
drv_found = 0;
lunid = (0xff &
(unsigned int)(ld_buff->LUN[i][3])) << 24;
lunid |= (0xff &
(unsigned int)(ld_buff->LUN[i][2])) << 16;
lunid |= (0xff &
(unsigned int)(ld_buff->LUN[i][1])) << 8;
lunid |= 0xff &
(unsigned int)(ld_buff->LUN[i][0]);
/* Find if the LUN is already in the drive array
* of the controller. If so then update its info
* if not is use. If it does not exist then find
* the first free index and add it.
*/
for (j=0; j <= h->highest_lun; j++){
if (h->drv[j].LunID == lunid){
drv_index = j;
drv_found = 1;
}
}
/* check if the drive was found already in the array */
if (!drv_found){
drv_index = cciss_find_free_drive_index(ctlr);
if (drv_index == -1)
goto freeret;
}
h->drv[drv_index].LunID = lunid;
cciss_update_drive_info(ctlr, drv_index);
} /* end for */
} /* end else */
freeret:
kfree(ld_buff);
h->busy_configuring = 0;
/* We return -1 here to tell the ACU that we have registered/updated
* all of the drives that we can and to keep it from calling us
* additional times.
*/
return -1;
mem_msg:
printk(KERN_ERR "cciss: out of memory\n");
goto freeret;
}
/* This function will deregister the disk and it's queue from the
* kernel. It must be called with the controller lock held and the
* drv structures busy_configuring flag set. It's parameters are:
*
* disk = This is the disk to be deregistered
* drv = This is the drive_info_struct associated with the disk to be
* deregistered. It contains information about the disk used
* by the driver.
* clear_all = This flag determines whether or not the disk information
* is going to be completely cleared out and the highest_lun
* reset. Sometimes we want to clear out information about
* the disk in preperation for re-adding it. In this case
* the highest_lun should be left unchanged and the LunID
* should not be cleared.
*/
static int deregister_disk(struct gendisk *disk, drive_info_struct *drv,
int clear_all)
{
ctlr_info_t *h = get_host(disk);
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
/* make sure logical volume is NOT is use */
if( drv->usage_count > 1) {
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
if(clear_all || (h->gendisk[0] == disk)) {
if (drv->usage_count > 1)
return -EBUSY;
}
drv->usage_count++;
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
else
if( drv->usage_count > 0 )
return -EBUSY;
/* invalidate the devices and deregister the disk */
if (disk->flags & GENHD_FL_UP)
/* invalidate the devices and deregister the disk. If it is disk
* zero do not deregister it but just zero out it's values. This
* allows us to delete disk zero but keep the controller registered.
*/
if (h->gendisk[0] != disk){
if (disk->flags & GENHD_FL_UP){
blk_cleanup_queue(disk->queue);
del_gendisk(disk);
drv->queue = NULL;
}
}
--h->num_luns;
/* zero out the disk size info */
drv->nr_blocks = 0;
drv->block_size = 0;
drv->heads = 0;
drv->sectors = 0;
drv->cylinders = 0;
drv->raid_level = -1; /* This can be used as a flag variable to
* indicate that this element of the drive
* array is free.
*/
if (clear_all){
/* check to see if it was the last disk */
if (drv == h->drv + h->highest_lun) {
/* if so, find the new hightest lun */
int i, newhighest =-1;
for(i=0; i<h->highest_lun; i++) {
/* if the disk has size > 0, it is available */
if (h->drv[i].nr_blocks)
if (h->drv[i].heads)
newhighest = i;
}
h->highest_lun = newhighest;
}
--h->num_luns;
/* zero out the disk size info */
drv->nr_blocks = 0;
drv->block_size = 0;
drv->cylinders = 0;
drv->LunID = 0;
}
return(0);
}
static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
size_t size,
unsigned int use_unit_num, /* 0: address the controller,
@ -1513,164 +1799,6 @@ cciss_read_capacity(int ctlr, int logvol, ReadCapdata_struct *buf,
return;
}
static int register_new_disk(ctlr_info_t *h)
{
struct gendisk *disk;
int ctlr = h->ctlr;
int i;
int num_luns;
int logvol;
int new_lun_found = 0;
int new_lun_index = 0;
int free_index_found = 0;
int free_index = 0;
ReportLunData_struct *ld_buff = NULL;
ReadCapdata_struct *size_buff = NULL;
InquiryData_struct *inq_buff = NULL;
int return_code;
int listlength = 0;
__u32 lunid = 0;
unsigned int block_size;
unsigned int total_size;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
/* if we have no space in our disk array left to add anything */
if( h->num_luns >= CISS_MAX_LUN)
return -EINVAL;
ld_buff = kmalloc(sizeof(ReportLunData_struct), GFP_KERNEL);
if (ld_buff == NULL)
goto mem_msg;
memset(ld_buff, 0, sizeof(ReportLunData_struct));
size_buff = kmalloc(sizeof( ReadCapdata_struct), GFP_KERNEL);
if (size_buff == NULL)
goto mem_msg;
inq_buff = kmalloc(sizeof( InquiryData_struct), GFP_KERNEL);
if (inq_buff == NULL)
goto mem_msg;
return_code = sendcmd_withirq(CISS_REPORT_LOG, ctlr, ld_buff,
sizeof(ReportLunData_struct), 0, 0, 0, TYPE_CMD);
if( return_code == IO_OK)
{
// printk("LUN Data\n--------------------------\n");
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[0])) << 24;
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[1])) << 16;
listlength |= (0xff & (unsigned int)(ld_buff->LUNListLength[2])) << 8;
listlength |= 0xff & (unsigned int)(ld_buff->LUNListLength[3]);
} else /* reading number of logical volumes failed */
{
printk(KERN_WARNING "cciss: report logical volume"
" command failed\n");
listlength = 0;
goto free_err;
}
num_luns = listlength / 8; // 8 bytes pre entry
if (num_luns > CISS_MAX_LUN)
{
num_luns = CISS_MAX_LUN;
}
#ifdef CCISS_DEBUG
printk(KERN_DEBUG "Length = %x %x %x %x = %d\n", ld_buff->LUNListLength[0],
ld_buff->LUNListLength[1], ld_buff->LUNListLength[2],
ld_buff->LUNListLength[3], num_luns);
#endif
for(i=0; i< num_luns; i++)
{
int j;
int lunID_found = 0;
lunid = (0xff & (unsigned int)(ld_buff->LUN[i][3])) << 24;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][2])) << 16;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][1])) << 8;
lunid |= 0xff & (unsigned int)(ld_buff->LUN[i][0]);
/* check to see if this is a new lun */
for(j=0; j <= h->highest_lun; j++)
{
#ifdef CCISS_DEBUG
printk("Checking %d %x against %x\n", j,h->drv[j].LunID,
lunid);
#endif /* CCISS_DEBUG */
if (h->drv[j].LunID == lunid)
{
lunID_found = 1;
break;
}
}
if( lunID_found == 1)
continue;
else
{ /* It is the new lun we have been looking for */
#ifdef CCISS_DEBUG
printk("new lun found at %d\n", i);
#endif /* CCISS_DEBUG */
new_lun_index = i;
new_lun_found = 1;
break;
}
}
if (!new_lun_found)
{
printk(KERN_WARNING "cciss: New Logical Volume not found\n");
goto free_err;
}
/* Now find the free index */
for(i=0; i <CISS_MAX_LUN; i++)
{
#ifdef CCISS_DEBUG
printk("Checking Index %d\n", i);
#endif /* CCISS_DEBUG */
if(h->drv[i].LunID == 0)
{
#ifdef CCISS_DEBUG
printk("free index found at %d\n", i);
#endif /* CCISS_DEBUG */
free_index_found = 1;
free_index = i;
break;
}
}
if (!free_index_found)
{
printk(KERN_WARNING "cciss: unable to find free slot for disk\n");
goto free_err;
}
logvol = free_index;
h->drv[logvol].LunID = lunid;
/* there could be gaps in lun numbers, track hightest */
if(h->highest_lun < lunid)
h->highest_lun = logvol;
cciss_read_capacity(ctlr, logvol, size_buff, 1,
&total_size, &block_size);
cciss_geometry_inquiry(ctlr, logvol, 1, total_size, block_size,
inq_buff, &h->drv[logvol]);
h->drv[logvol].usage_count = 0;
++h->num_luns;
/* setup partitions per disk */
disk = h->gendisk[logvol];
set_capacity(disk, h->drv[logvol].nr_blocks);
/* if it's the controller it's already added */
if(logvol)
add_disk(disk);
freeret:
kfree(ld_buff);
kfree(size_buff);
kfree(inq_buff);
return (logvol);
mem_msg:
printk(KERN_ERR "cciss: out of memory\n");
free_err:
logvol = -1;
goto freeret;
}
static int cciss_revalidate(struct gendisk *disk)
{
ctlr_info_t *h = get_host(disk);
@ -2652,12 +2780,16 @@ static void cciss_getgeometry(int cntl_num)
#endif /* CCISS_DEBUG */
hba[cntl_num]->highest_lun = hba[cntl_num]->num_luns-1;
for(i=0; i< hba[cntl_num]->num_luns; i++)
// for(i=0; i< hba[cntl_num]->num_luns; i++)
for(i=0; i < CISS_MAX_LUN; i++)
{
lunid = (0xff & (unsigned int)(ld_buff->LUN[i][3])) << 24;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][2])) << 16;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][1])) << 8;
if (i < hba[cntl_num]->num_luns){
lunid = (0xff & (unsigned int)(ld_buff->LUN[i][3]))
<< 24;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][2]))
<< 16;
lunid |= (0xff & (unsigned int)(ld_buff->LUN[i][1]))
<< 8;
lunid |= 0xff & (unsigned int)(ld_buff->LUN[i][0]);
hba[cntl_num]->drv[i].LunID = lunid;
@ -2665,13 +2797,18 @@ static void cciss_getgeometry(int cntl_num)
#ifdef CCISS_DEBUG
printk(KERN_DEBUG "LUN[%d]: %x %x %x %x = %x\n", i,
ld_buff->LUN[i][0], ld_buff->LUN[i][1],ld_buff->LUN[i][2],
ld_buff->LUN[i][3], hba[cntl_num]->drv[i].LunID);
ld_buff->LUN[i][0], ld_buff->LUN[i][1],
ld_buff->LUN[i][2], ld_buff->LUN[i][3],
hba[cntl_num]->drv[i].LunID);
#endif /* CCISS_DEBUG */
cciss_read_capacity(cntl_num, i, size_buff, 0,
&total_size, &block_size);
cciss_geometry_inquiry(cntl_num, i, 0, total_size, block_size,
inq_buff, &hba[cntl_num]->drv[i]);
cciss_geometry_inquiry(cntl_num, i, 0, total_size,
block_size, inq_buff, &hba[cntl_num]->drv[i]);
} else {
/* initialize raid_level to indicate a free space */
hba[cntl_num]->drv[i].raid_level = -1;
}
}
kfree(ld_buff);
kfree(size_buff);

8
drivers/block/cciss.h
Просмотреть файл

@ -35,7 +35,13 @@ typedef struct _drive_info_struct
int heads;
int sectors;
int cylinders;
int raid_level;
int raid_level; /* set to -1 to indicate that
* the drive is not in use/configured
*/
int busy_configuring; /*This is set when the drive is being removed
*to prevent it from being opened or it's queue
*from being started.
*/
} drive_info_struct;
struct ctlr_info