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WSL2-Linux-Kernel
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[S390] dcssblk: add >2G DCSSs support and stacked contiguous DCSSs support. 

The DCSS block device driver is modified to add >2G DCSSs support and
allow a DCSS block device to map to a set of contiguous DCSSs.  The
extmem code is also modified to use new Diagnose x'64' subcodes for
>2G DCSSs.

Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hongjie Yang 2008-10-10 21:33:21 +02:00 коммит произвёл Martin Schwidefsky
Родитель 753c4dd6a2
Коммит b2300b9efe
2 изменённых файлов: 605 добавлений и 179 удалений
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257
arch/s390/mm/extmem.c
Просмотреть файл

@ -43,21 +43,41 @@
#define DCSS_FINDSEG 0x0c #define DCSS_FINDSEG 0x0c
#define DCSS_LOADNOLY 0x10 #define DCSS_LOADNOLY 0x10
#define DCSS_SEGEXT 0x18 #define DCSS_SEGEXT 0x18
#define DCSS_LOADSHRX 0x20
#define DCSS_LOADNSRX 0x24
#define DCSS_FINDSEGX 0x2c
#define DCSS_SEGEXTX 0x38
#define DCSS_FINDSEGA 0x0c #define DCSS_FINDSEGA 0x0c
struct qrange { struct qrange {
unsigned int start; // 3byte start address, 1 byte type unsigned long start; /* last byte type */
unsigned int end; // 3byte end address, 1 byte reserved unsigned long end; /* last byte reserved */
}; };
struct qout64 { struct qout64 {
int segstart; unsigned long segstart;
int segend; unsigned long segend;
int segcnt; int segcnt;
int segrcnt; int segrcnt;
struct qrange range[6]; struct qrange range[6];
}; };
#ifdef CONFIG_64BIT
struct qrange_old {
unsigned int start; /* last byte type */
unsigned int end; /* last byte reserved */
};
/* output area format for the Diag x'64' old subcode x'18' */
struct qout64_old {
int segstart;
int segend;
int segcnt;
int segrcnt;
struct qrange_old range[6];
};
#endif
struct qin64 { struct qin64 {
char qopcode; char qopcode;
char rsrv1[3]; char rsrv1[3];
@ -86,6 +106,55 @@ static DEFINE_MUTEX(dcss_lock);
static LIST_HEAD(dcss_list); static LIST_HEAD(dcss_list);
static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC", static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
"EW/EN-MIXED" }; "EW/EN-MIXED" };
static int loadshr_scode, loadnsr_scode, findseg_scode;
static int segext_scode, purgeseg_scode;
static int scode_set;
/* set correct Diag x'64' subcodes. */
static int
dcss_set_subcodes(void)
{
#ifdef CONFIG_64BIT
char *name = kmalloc(8 * sizeof(char), GFP_DMA);
unsigned long rx, ry;
int rc;
if (name == NULL)
return -ENOMEM;
rx = (unsigned long) name;
ry = DCSS_FINDSEGX;
strcpy(name, "dummy");
asm volatile(
" diag %0,%1,0x64\n"
"0: ipm %2\n"
" srl %2,28\n"
" j 2f\n"
"1: la %2,3\n"
"2:\n"
EX_TABLE(0b, 1b)
: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
kfree(name);
/* Diag x'64' new subcodes are supported, set to new subcodes */
if (rc != 3) {
loadshr_scode = DCSS_LOADSHRX;
loadnsr_scode = DCSS_LOADNSRX;
purgeseg_scode = DCSS_PURGESEG;
findseg_scode = DCSS_FINDSEGX;
segext_scode = DCSS_SEGEXTX;
return 0;
}
#endif
/* Diag x'64' new subcodes are not supported, set to old subcodes */
loadshr_scode = DCSS_LOADNOLY;
loadnsr_scode = DCSS_LOADNSR;
purgeseg_scode = DCSS_PURGESEG;
findseg_scode = DCSS_FINDSEG;
segext_scode = DCSS_SEGEXT;
return 0;
}
/* /*
* Create the 8 bytes, ebcdic VM segment name from * Create the 8 bytes, ebcdic VM segment name from
@ -135,25 +204,45 @@ segment_by_name (char *name)
* Perform a function on a dcss segment. * Perform a function on a dcss segment.
*/ */
static inline int static inline int
dcss_diag (__u8 func, void *parameter, dcss_diag(int *func, void *parameter,
unsigned long *ret1, unsigned long *ret2) unsigned long *ret1, unsigned long *ret2)
{ {
unsigned long rx, ry; unsigned long rx, ry;
int rc; int rc;
if (scode_set == 0) {
rc = dcss_set_subcodes();
if (rc < 0)
return rc;
scode_set = 1;
}
rx = (unsigned long) parameter; rx = (unsigned long) parameter;
ry = (unsigned long) func; ry = (unsigned long) *func;
asm volatile(
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
" sam31\n" /* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
" diag %0,%1,0x64\n" if (*func > DCSS_SEGEXT)
" sam64\n" asm volatile(
" diag %0,%1,0x64\n"
" ipm %2\n"
" srl %2,28\n"
: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
/* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
else
asm volatile(
" sam31\n"
" diag %0,%1,0x64\n"
" sam64\n"
" ipm %2\n"
" srl %2,28\n"
: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
#else #else
asm volatile(
" diag %0,%1,0x64\n" " diag %0,%1,0x64\n"
#endif
" ipm %2\n" " ipm %2\n"
" srl %2,28\n" " srl %2,28\n"
: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc"); : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc");
#endif
*ret1 = rx; *ret1 = rx;
*ret2 = ry; *ret2 = ry;
return rc; return rc;
@ -190,14 +279,45 @@ query_segment_type (struct dcss_segment *seg)
qin->qoutlen = sizeof(struct qout64); qin->qoutlen = sizeof(struct qout64);
memcpy (qin->qname, seg->dcss_name, 8); memcpy (qin->qname, seg->dcss_name, 8);
diag_cc = dcss_diag (DCSS_SEGEXT, qin, &dummy, &vmrc); diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
if (diag_cc < 0) {
rc = diag_cc;
goto out_free;
}
if (diag_cc > 1) { if (diag_cc > 1) {
PRINT_WARN ("segment_type: diag returned error %ld\n", vmrc); PRINT_WARN ("segment_type: diag returned error %ld\n", vmrc);
rc = dcss_diag_translate_rc (vmrc); rc = dcss_diag_translate_rc (vmrc);
goto out_free; goto out_free;
} }
#ifdef CONFIG_64BIT
/* Only old format of output area of Diagnose x'64' is supported,
copy data for the new format. */
if (segext_scode == DCSS_SEGEXT) {
struct qout64_old *qout_old;
qout_old = kzalloc(sizeof(struct qout64_old), GFP_DMA);
if (qout_old == NULL) {
rc = -ENOMEM;
goto out_free;
}
memcpy(qout_old, qout, sizeof(struct qout64_old));
qout->segstart = (unsigned long) qout_old->segstart;
qout->segend = (unsigned long) qout_old->segend;
qout->segcnt = qout_old->segcnt;
qout->segrcnt = qout_old->segrcnt;
if (qout->segcnt > 6)
qout->segrcnt = 6;
for (i = 0; i < qout->segrcnt; i++) {
qout->range[i].start =
(unsigned long) qout_old->range[i].start;
qout->range[i].end =
(unsigned long) qout_old->range[i].end;
}
kfree(qout_old);
}
#endif
if (qout->segcnt > 6) { if (qout->segcnt > 6) {
rc = -ENOTSUPP; rc = -ENOTSUPP;
goto out_free; goto out_free;
@ -268,6 +388,30 @@ segment_type (char* name)
return seg.vm_segtype; return seg.vm_segtype;
} }
/*
* check if segment collides with other segments that are currently loaded
* returns 1 if this is the case, 0 if no collision was found
*/
static int
segment_overlaps_others (struct dcss_segment *seg)
{
struct list_head *l;
struct dcss_segment *tmp;
BUG_ON(!mutex_is_locked(&dcss_lock));
list_for_each(l, &dcss_list) {
tmp = list_entry(l, struct dcss_segment, list);
if ((tmp->start_addr >> 20) > (seg->end >> 20))
continue;
if ((tmp->end >> 20) < (seg->start_addr >> 20))
continue;
if (seg == tmp)
continue;
return 1;
}
return 0;
}
/* /*
* real segment loading function, called from segment_load * real segment loading function, called from segment_load
*/ */
@ -276,7 +420,8 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
{ {
struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment), struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment),
GFP_DMA); GFP_DMA);
int dcss_command, rc, diag_cc; int rc, diag_cc;
unsigned long start_addr, end_addr, dummy;
if (seg == NULL) { if (seg == NULL) {
rc = -ENOMEM; rc = -ENOMEM;
@ -287,6 +432,13 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
if (rc < 0) if (rc < 0)
goto out_free; goto out_free;
if (loadshr_scode == DCSS_LOADSHRX) {
if (segment_overlaps_others(seg)) {
rc = -EBUSY;
goto out_free;
}
}
rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
if (rc) if (rc)
@ -316,20 +468,28 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long
} }
if (do_nonshared) if (do_nonshared)
dcss_command = DCSS_LOADNSR; diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
&start_addr, &end_addr);
else else
dcss_command = DCSS_LOADNOLY; diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
&start_addr, &end_addr);
diag_cc = dcss_diag(dcss_command, seg->dcss_name, if (diag_cc < 0) {
&seg->start_addr, &seg->end); dcss_diag(&purgeseg_scode, seg->dcss_name,
if (diag_cc > 1) { &dummy, &dummy);
PRINT_WARN ("segment_load: could not load segment %s - " rc = diag_cc;
"diag returned error (%ld)\n",name,seg->end);
rc = dcss_diag_translate_rc (seg->end);
dcss_diag(DCSS_PURGESEG, seg->dcss_name,
&seg->start_addr, &seg->end);
goto out_resource; goto out_resource;
} }
if (diag_cc > 1) {
PRINT_WARN ("segment_load: could not load segment %s - "
"diag returned error (%ld)\n",
name, end_addr);
rc = dcss_diag_translate_rc(end_addr);
dcss_diag(&purgeseg_scode, seg->dcss_name,
&dummy, &dummy);
goto out_resource;
}
seg->start_addr = start_addr;
seg->end = end_addr;
seg->do_nonshared = do_nonshared; seg->do_nonshared = do_nonshared;
atomic_set(&seg->ref_count, 1); atomic_set(&seg->ref_count, 1);
list_add(&seg->list, &dcss_list); list_add(&seg->list, &dcss_list);
@ -423,8 +583,8 @@ int
segment_modify_shared (char *name, int do_nonshared) segment_modify_shared (char *name, int do_nonshared)
{ {
struct dcss_segment *seg; struct dcss_segment *seg;
unsigned long dummy; unsigned long start_addr, end_addr, dummy;
int dcss_command, rc, diag_cc; int rc, diag_cc;
mutex_lock(&dcss_lock); mutex_lock(&dcss_lock);
seg = segment_by_name (name); seg = segment_by_name (name);
@ -445,38 +605,51 @@ segment_modify_shared (char *name, int do_nonshared)
goto out_unlock; goto out_unlock;
} }
release_resource(seg->res); release_resource(seg->res);
if (do_nonshared) { if (do_nonshared)
dcss_command = DCSS_LOADNSR;
seg->res->flags &= ~IORESOURCE_READONLY; seg->res->flags &= ~IORESOURCE_READONLY;
} else { else
dcss_command = DCSS_LOADNOLY;
if (seg->vm_segtype == SEG_TYPE_SR || if (seg->vm_segtype == SEG_TYPE_SR ||
seg->vm_segtype == SEG_TYPE_ER) seg->vm_segtype == SEG_TYPE_ER)
seg->res->flags |= IORESOURCE_READONLY; seg->res->flags |= IORESOURCE_READONLY;
}
if (request_resource(&iomem_resource, seg->res)) { if (request_resource(&iomem_resource, seg->res)) {
PRINT_WARN("segment_modify_shared: could not reload segment %s" PRINT_WARN("segment_modify_shared: could not reload segment %s"
" - overlapping resources\n", name); " - overlapping resources\n", name);
rc = -EBUSY; rc = -EBUSY;
kfree(seg->res); kfree(seg->res);
goto out_del; goto out_del_mem;
}
dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
if (do_nonshared)
diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
&start_addr, &end_addr);
else
diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
&start_addr, &end_addr);
if (diag_cc < 0) {
rc = diag_cc;
goto out_del_res;
} }
dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy);
diag_cc = dcss_diag(dcss_command, seg->dcss_name,
&seg->start_addr, &seg->end);
if (diag_cc > 1) { if (diag_cc > 1) {
PRINT_WARN ("segment_modify_shared: could not reload segment %s" PRINT_WARN ("segment_modify_shared: could not reload segment %s"
" - diag returned error (%ld)\n",name,seg->end); " - diag returned error (%ld)\n",
rc = dcss_diag_translate_rc (seg->end); name, end_addr);
goto out_del; rc = dcss_diag_translate_rc(end_addr);
goto out_del_res;
} }
seg->start_addr = start_addr;
seg->end = end_addr;
seg->do_nonshared = do_nonshared; seg->do_nonshared = do_nonshared;
rc = 0; rc = 0;
goto out_unlock; goto out_unlock;
out_del: out_del_res:
release_resource(seg->res);
kfree(seg->res);
out_del_mem:
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
list_del(&seg->list); list_del(&seg->list);
dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy); dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
kfree(seg); kfree(seg);
out_unlock: out_unlock:
mutex_unlock(&dcss_lock); mutex_unlock(&dcss_lock);
@ -510,7 +683,7 @@ segment_unload(char *name)
kfree(seg->res); kfree(seg->res);
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
list_del(&seg->list); list_del(&seg->list);
dcss_diag(DCSS_PURGESEG, seg->dcss_name, &dummy, &dummy); dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
kfree(seg); kfree(seg);
out_unlock: out_unlock:
mutex_unlock(&dcss_lock); mutex_unlock(&dcss_lock);
@ -545,7 +718,7 @@ segment_save(char *name)
endpfn = (seg->end) >> PAGE_SHIFT; endpfn = (seg->end) >> PAGE_SHIFT;
sprintf(cmd1, "DEFSEG %s", name); sprintf(cmd1, "DEFSEG %s", name);
for (i=0; i<seg->segcnt; i++) { for (i=0; i<seg->segcnt; i++) {
sprintf(cmd1+strlen(cmd1), " %X-%X %s", sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
seg->range[i].start >> PAGE_SHIFT, seg->range[i].start >> PAGE_SHIFT,
seg->range[i].end >> PAGE_SHIFT, seg->range[i].end >> PAGE_SHIFT,
segtype_string[seg->range[i].start & 0xff]); segtype_string[seg->range[i].start & 0xff]);

527
drivers/s390/block/dcssblk.c
Просмотреть файл

@ -31,7 +31,6 @@
#define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x) #define PRINT_WARN(x...) printk(KERN_WARNING DCSSBLK_NAME " warning: " x)
#define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x) #define PRINT_ERR(x...) printk(KERN_ERR DCSSBLK_NAME " error: " x)
static int dcssblk_open(struct inode *inode, struct file *filp); static int dcssblk_open(struct inode *inode, struct file *filp);
static int dcssblk_release(struct inode *inode, struct file *filp); static int dcssblk_release(struct inode *inode, struct file *filp);
static int dcssblk_make_request(struct request_queue *q, struct bio *bio); static int dcssblk_make_request(struct request_queue *q, struct bio *bio);
@ -48,26 +47,6 @@ static struct block_device_operations dcssblk_devops = {
.direct_access = dcssblk_direct_access, .direct_access = dcssblk_direct_access,
}; };
static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
static DEVICE_ATTR(save, S_IWUSR | S_IRUGO, dcssblk_save_show,
dcssblk_save_store);
static DEVICE_ATTR(shared, S_IWUSR | S_IRUGO, dcssblk_shared_show,
dcssblk_shared_store);
static struct device *dcssblk_root_dev;
struct dcssblk_dev_info { struct dcssblk_dev_info {
struct list_head lh; struct list_head lh;
struct device dev; struct device dev;
@ -80,8 +59,42 @@ struct dcssblk_dev_info {
unsigned char save_pending; unsigned char save_pending;
unsigned char is_shared; unsigned char is_shared;
struct request_queue *dcssblk_queue; struct request_queue *dcssblk_queue;
int num_of_segments;
struct list_head seg_list;
}; };
struct segment_info {
struct list_head lh;
char segment_name[BUS_ID_SIZE];
unsigned long start;
unsigned long end;
int segment_type;
};
static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t dcssblk_seglist_show(struct device *dev,
struct device_attribute *attr,
char *buf);
static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show,
dcssblk_save_store);
static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show,
dcssblk_shared_store);
static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL);
static struct device *dcssblk_root_dev;
static LIST_HEAD(dcssblk_devices); static LIST_HEAD(dcssblk_devices);
static struct rw_semaphore dcssblk_devices_sem; static struct rw_semaphore dcssblk_devices_sem;
@ -91,8 +104,15 @@ static struct rw_semaphore dcssblk_devices_sem;
static void static void
dcssblk_release_segment(struct device *dev) dcssblk_release_segment(struct device *dev)
{ {
PRINT_DEBUG("segment release fn called for %s\n", dev_name(dev)); struct dcssblk_dev_info *dev_info;
kfree(container_of(dev, struct dcssblk_dev_info, dev)); struct segment_info *entry, *temp;
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) {
list_del(&entry->lh);
kfree(entry);
}
kfree(dev_info);
module_put(THIS_MODULE); module_put(THIS_MODULE);
} }
@ -142,6 +162,169 @@ dcssblk_get_device_by_name(char *name)
return NULL; return NULL;
} }
/*
* get the struct segment_info from seg_list
* for the given name.
* down_read(&dcssblk_devices_sem) must be held.
*/
static struct segment_info *
dcssblk_get_segment_by_name(char *name)
{
struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
list_for_each_entry(dev_info, &dcssblk_devices, lh) {
list_for_each_entry(entry, &dev_info->seg_list, lh) {
if (!strcmp(name, entry->segment_name))
return entry;
}
}
return NULL;
}
/*
* get the highest address of the multi-segment block.
*/
static unsigned long
dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info)
{
unsigned long highest_addr;
struct segment_info *entry;
highest_addr = 0;
list_for_each_entry(entry, &dev_info->seg_list, lh) {
if (highest_addr < entry->end)
highest_addr = entry->end;
}
return highest_addr;
}
/*
* get the lowest address of the multi-segment block.
*/
static unsigned long
dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info)
{
int set_first;
unsigned long lowest_addr;
struct segment_info *entry;
set_first = 0;
lowest_addr = 0;
list_for_each_entry(entry, &dev_info->seg_list, lh) {
if (set_first == 0) {
lowest_addr = entry->start;
set_first = 1;
} else {
if (lowest_addr > entry->start)
lowest_addr = entry->start;
}
}
return lowest_addr;
}
/*
* Check continuity of segments.
*/
static int
dcssblk_is_continuous(struct dcssblk_dev_info *dev_info)
{
int i, j, rc;
struct segment_info *sort_list, *entry, temp;
if (dev_info->num_of_segments <= 1)
return 0;
sort_list = kzalloc(
sizeof(struct segment_info) * dev_info->num_of_segments,
GFP_KERNEL);
if (sort_list == NULL)
return -ENOMEM;
i = 0;
list_for_each_entry(entry, &dev_info->seg_list, lh) {
memcpy(&sort_list[i], entry, sizeof(struct segment_info));
i++;
}
/* sort segments */
for (i = 0; i < dev_info->num_of_segments; i++)
for (j = 0; j < dev_info->num_of_segments; j++)
if (sort_list[j].start > sort_list[i].start) {
memcpy(&temp, &sort_list[i],
sizeof(struct segment_info));
memcpy(&sort_list[i], &sort_list[j],
sizeof(struct segment_info));
memcpy(&sort_list[j], &temp,
sizeof(struct segment_info));
}
/* check continuity */
for (i = 0; i < dev_info->num_of_segments - 1; i++) {
if ((sort_list[i].end + 1) != sort_list[i+1].start) {
PRINT_ERR("Segment %s is not contiguous with "
"segment %s\n",
sort_list[i].segment_name,
sort_list[i+1].segment_name);
rc = -EINVAL;
goto out;
}
/* EN and EW are allowed in a block device */
if (sort_list[i].segment_type != sort_list[i+1].segment_type) {
if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) ||
(sort_list[i].segment_type == SEG_TYPE_ER) ||
!(sort_list[i+1].segment_type &
SEGMENT_EXCLUSIVE) ||
(sort_list[i+1].segment_type == SEG_TYPE_ER)) {
PRINT_ERR("Segment %s has different type from "
"segment %s\n",
sort_list[i].segment_name,
sort_list[i+1].segment_name);
rc = -EINVAL;
goto out;
}
}
}
rc = 0;
out:
kfree(sort_list);
return rc;
}
/*
* Load a segment
*/
static int
dcssblk_load_segment(char *name, struct segment_info **seg_info)
{
int rc;
/* already loaded? */
down_read(&dcssblk_devices_sem);
*seg_info = dcssblk_get_segment_by_name(name);
up_read(&dcssblk_devices_sem);
if (*seg_info != NULL)
return -EEXIST;
/* get a struct segment_info */
*seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL);
if (*seg_info == NULL)
return -ENOMEM;
strcpy((*seg_info)->segment_name, name);
/* load the segment */
rc = segment_load(name, SEGMENT_SHARED,
&(*seg_info)->start, &(*seg_info)->end);
if (rc < 0) {
segment_warning(rc, (*seg_info)->segment_name);
kfree(*seg_info);
} else {
INIT_LIST_HEAD(&(*seg_info)->lh);
(*seg_info)->segment_type = rc;
}
return rc;
}
static void dcssblk_unregister_callback(struct device *dev) static void dcssblk_unregister_callback(struct device *dev)
{ {
device_unregister(dev); device_unregister(dev);
@ -165,6 +348,7 @@ static ssize_t
dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
{ {
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
struct segment_info *entry, *temp;
int rc; int rc;
if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0'))
@ -172,46 +356,46 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
down_write(&dcssblk_devices_sem); down_write(&dcssblk_devices_sem);
dev_info = container_of(dev, struct dcssblk_dev_info, dev); dev_info = container_of(dev, struct dcssblk_dev_info, dev);
if (atomic_read(&dev_info->use_count)) { if (atomic_read(&dev_info->use_count)) {
PRINT_ERR("share: segment %s is busy!\n",
dev_info->segment_name);
rc = -EBUSY; rc = -EBUSY;
goto out; goto out;
} }
if (inbuf[0] == '1') { if (inbuf[0] == '1') {
// reload segment in shared mode /* reload segments in shared mode */
rc = segment_modify_shared(dev_info->segment_name, list_for_each_entry(entry, &dev_info->seg_list, lh) {
SEGMENT_SHARED); rc = segment_modify_shared(entry->segment_name,
if (rc < 0) { SEGMENT_SHARED);
BUG_ON(rc == -EINVAL); if (rc < 0) {
if (rc != -EAGAIN) BUG_ON(rc == -EINVAL);
goto removeseg; if (rc != -EAGAIN)
} else { goto removeseg;
dev_info->is_shared = 1;
switch (dev_info->segment_type) {
case SEG_TYPE_SR:
case SEG_TYPE_ER:
case SEG_TYPE_SC:
set_disk_ro(dev_info->gd,1);
} }
} }
dev_info->is_shared = 1;
switch (dev_info->segment_type) {
case SEG_TYPE_SR:
case SEG_TYPE_ER:
case SEG_TYPE_SC:
set_disk_ro(dev_info->gd, 1);
}
} else if (inbuf[0] == '0') { } else if (inbuf[0] == '0') {
// reload segment in exclusive mode /* reload segments in exclusive mode */
if (dev_info->segment_type == SEG_TYPE_SC) { if (dev_info->segment_type == SEG_TYPE_SC) {
PRINT_ERR("Segment type SC (%s) cannot be loaded in " PRINT_ERR("Segment type SC (%s) cannot be loaded in "
"non-shared mode\n", dev_info->segment_name); "non-shared mode\n", dev_info->segment_name);
rc = -EINVAL; rc = -EINVAL;
goto out; goto out;
} }
rc = segment_modify_shared(dev_info->segment_name, list_for_each_entry(entry, &dev_info->seg_list, lh) {
SEGMENT_EXCLUSIVE); rc = segment_modify_shared(entry->segment_name,
if (rc < 0) { SEGMENT_EXCLUSIVE);
BUG_ON(rc == -EINVAL); if (rc < 0) {
if (rc != -EAGAIN) BUG_ON(rc == -EINVAL);
goto removeseg; if (rc != -EAGAIN)
} else { goto removeseg;
dev_info->is_shared = 0; }
set_disk_ro(dev_info->gd, 0);
} }
dev_info->is_shared = 0;
set_disk_ro(dev_info->gd, 0);
} else { } else {
rc = -EINVAL; rc = -EINVAL;
goto out; goto out;
@ -220,8 +404,14 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
goto out; goto out;
removeseg: removeseg:
PRINT_ERR("Could not reload segment %s, removing it now!\n", PRINT_ERR("Could not reload segment(s) of the device %s, removing "
dev_info->segment_name); "segment(s) now!\n",
dev_info->segment_name);
temp = entry;
list_for_each_entry(entry, &dev_info->seg_list, lh) {
if (entry != temp)
segment_unload(entry->segment_name);
}
list_del(&dev_info->lh); list_del(&dev_info->lh);
del_gendisk(dev_info->gd); del_gendisk(dev_info->gd);
@ -254,6 +444,7 @@ static ssize_t
dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count)
{ {
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0'))
return -EINVAL; return -EINVAL;
@ -263,14 +454,16 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
if (inbuf[0] == '1') { if (inbuf[0] == '1') {
if (atomic_read(&dev_info->use_count) == 0) { if (atomic_read(&dev_info->use_count) == 0) {
// device is idle => we save immediately // device is idle => we save immediately
PRINT_INFO("Saving segment %s\n", PRINT_INFO("Saving segment(s) of the device %s\n",
dev_info->segment_name); dev_info->segment_name);
segment_save(dev_info->segment_name); list_for_each_entry(entry, &dev_info->seg_list, lh) {
segment_save(entry->segment_name);
}
} else { } else {
// device is busy => we save it when it becomes // device is busy => we save it when it becomes
// idle in dcssblk_release // idle in dcssblk_release
PRINT_INFO("Segment %s is currently busy, it will " PRINT_INFO("Device %s is currently busy, segment(s) "
"be saved when it becomes idle...\n", "will be saved when it becomes idle...\n",
dev_info->segment_name); dev_info->segment_name);
dev_info->save_pending = 1; dev_info->save_pending = 1;
} }
@ -279,7 +472,8 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
// device is busy & the user wants to undo his save // device is busy & the user wants to undo his save
// request // request
dev_info->save_pending = 0; dev_info->save_pending = 0;
PRINT_INFO("Pending save for segment %s deactivated\n", PRINT_INFO("Pending save for segment(s) of the device "
"%s deactivated\n",
dev_info->segment_name); dev_info->segment_name);
} }
} else { } else {
@ -290,67 +484,124 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
return count; return count;
} }
/*
* device attribute for showing all segments in a device
*/
static ssize_t
dcssblk_seglist_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int i;
struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
down_read(&dcssblk_devices_sem);
dev_info = container_of(dev, struct dcssblk_dev_info, dev);
i = 0;
buf[0] = '\0';
list_for_each_entry(entry, &dev_info->seg_list, lh) {
strcpy(&buf[i], entry->segment_name);
i += strlen(entry->segment_name);
buf[i] = '\n';
i++;
}
up_read(&dcssblk_devices_sem);
return i;
}
/* /*
* device attribute for adding devices * device attribute for adding devices
*/ */
static ssize_t static ssize_t
dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{ {
int rc, i; int rc, i, j, num_of_segments;
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
struct segment_info *seg_info, *temp;
char *local_buf; char *local_buf;
unsigned long seg_byte_size; unsigned long seg_byte_size;
dev_info = NULL; dev_info = NULL;
seg_info = NULL;
if (dev != dcssblk_root_dev) { if (dev != dcssblk_root_dev) {
rc = -EINVAL; rc = -EINVAL;
goto out_nobuf; goto out_nobuf;
} }
if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) {
rc = -ENAMETOOLONG;
goto out_nobuf;
}
local_buf = kmalloc(count + 1, GFP_KERNEL); local_buf = kmalloc(count + 1, GFP_KERNEL);
if (local_buf == NULL) { if (local_buf == NULL) {
rc = -ENOMEM; rc = -ENOMEM;
goto out_nobuf; goto out_nobuf;
} }
/* /*
* parse input * parse input
*/ */
num_of_segments = 0;
for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) { for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) {
local_buf[i] = toupper(buf[i]); for (j = i; (buf[j] != ':') &&
} (buf[j] != '\0') &&
local_buf[i] = '\0'; (buf[j] != '\n') &&
if ((i == 0) || (i > 8)) { j < count; j++) {
rc = -ENAMETOOLONG; local_buf[j-i] = toupper(buf[j]);
goto out; }
} local_buf[j-i] = '\0';
/* if (((j - i) == 0) || ((j - i) > 8)) {
* already loaded? rc = -ENAMETOOLONG;
*/ goto seg_list_del;
down_read(&dcssblk_devices_sem); }
dev_info = dcssblk_get_device_by_name(local_buf);
up_read(&dcssblk_devices_sem); rc = dcssblk_load_segment(local_buf, &seg_info);
if (dev_info != NULL) { if (rc < 0)
PRINT_WARN("Segment %s already loaded!\n", local_buf); goto seg_list_del;
rc = -EEXIST; /*
goto out; * get a struct dcssblk_dev_info
} */
/* if (num_of_segments == 0) {
* get a struct dcssblk_dev_info dev_info = kzalloc(sizeof(struct dcssblk_dev_info),
*/ GFP_KERNEL);
dev_info = kzalloc(sizeof(struct dcssblk_dev_info), GFP_KERNEL); if (dev_info == NULL) {
if (dev_info == NULL) { rc = -ENOMEM;
rc = -ENOMEM; goto out;
goto out; }
strcpy(dev_info->segment_name, local_buf);
dev_info->segment_type = seg_info->segment_type;
INIT_LIST_HEAD(&dev_info->seg_list);
}
list_add_tail(&seg_info->lh, &dev_info->seg_list);
num_of_segments++;
i = j;
if ((buf[j] == '\0') || (buf[j] == '\n'))
break;
} }
strcpy(dev_info->segment_name, local_buf); /* no trailing colon at the end of the input */
dev_set_name(&dev_info->dev, local_buf); if ((i > 0) && (buf[i-1] == ':')) {
rc = -ENAMETOOLONG;
goto seg_list_del;
}
strlcpy(local_buf, buf, i + 1);
dev_info->num_of_segments = num_of_segments;
rc = dcssblk_is_continuous(dev_info);
if (rc < 0)
goto seg_list_del;
dev_info->start = dcssblk_find_lowest_addr(dev_info);
dev_info->end = dcssblk_find_highest_addr(dev_info);
dev_set_name(&dev_info->dev, dev_info->segment_name);
dev_info->dev.release = dcssblk_release_segment; dev_info->dev.release = dcssblk_release_segment;
INIT_LIST_HEAD(&dev_info->lh); INIT_LIST_HEAD(&dev_info->lh);
dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK);
if (dev_info->gd == NULL) { if (dev_info->gd == NULL) {
rc = -ENOMEM; rc = -ENOMEM;
goto free_dev_info; goto seg_list_del;
} }
dev_info->gd->major = dcssblk_major; dev_info->gd->major = dcssblk_major;
dev_info->gd->fops = &dcssblk_devops; dev_info->gd->fops = &dcssblk_devops;
@ -360,65 +611,52 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
dev_info->gd->driverfs_dev = &dev_info->dev; dev_info->gd->driverfs_dev = &dev_info->dev;
blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request);
blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096); blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096);
/*
* load the segment
*/
rc = segment_load(local_buf, SEGMENT_SHARED,
&dev_info->start, &dev_info->end);
if (rc < 0) {
segment_warning(rc, dev_info->segment_name);
goto dealloc_gendisk;
}
seg_byte_size = (dev_info->end - dev_info->start + 1); seg_byte_size = (dev_info->end - dev_info->start + 1);
set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors
PRINT_INFO("Loaded segment %s, size = %lu Byte, " PRINT_INFO("Loaded segment(s) %s, size = %lu Byte, "
"capacity = %lu (512 Byte) sectors\n", local_buf, "capacity = %lu (512 Byte) sectors\n", local_buf,
seg_byte_size, seg_byte_size >> 9); seg_byte_size, seg_byte_size >> 9);
dev_info->segment_type = rc;
dev_info->save_pending = 0; dev_info->save_pending = 0;
dev_info->is_shared = 1; dev_info->is_shared = 1;
dev_info->dev.parent = dcssblk_root_dev; dev_info->dev.parent = dcssblk_root_dev;
/* /*
* get minor, add to list *get minor, add to list
*/ */
down_write(&dcssblk_devices_sem); down_write(&dcssblk_devices_sem);
if (dcssblk_get_device_by_name(local_buf)) { if (dcssblk_get_segment_by_name(local_buf)) {
up_write(&dcssblk_devices_sem);
rc = -EEXIST; rc = -EEXIST;
goto unload_seg; goto release_gd;
} }
rc = dcssblk_assign_free_minor(dev_info); rc = dcssblk_assign_free_minor(dev_info);
if (rc) { if (rc)
up_write(&dcssblk_devices_sem); goto release_gd;
PRINT_ERR("No free minor number available! "
"Unloading segment...\n");
goto unload_seg;
}
sprintf(dev_info->gd->disk_name, "dcssblk%d", sprintf(dev_info->gd->disk_name, "dcssblk%d",
MINOR(disk_devt(dev_info->gd))); MINOR(disk_devt(dev_info->gd)));
list_add_tail(&dev_info->lh, &dcssblk_devices); list_add_tail(&dev_info->lh, &dcssblk_devices);
if (!try_module_get(THIS_MODULE)) { if (!try_module_get(THIS_MODULE)) {
rc = -ENODEV; rc = -ENODEV;
goto list_del; goto dev_list_del;
} }
/* /*
* register the device * register the device
*/ */
rc = device_register(&dev_info->dev); rc = device_register(&dev_info->dev);
if (rc) { if (rc) {
PRINT_ERR("Segment %s could not be registered RC=%d\n",
local_buf, rc);
module_put(THIS_MODULE); module_put(THIS_MODULE);
goto list_del; goto dev_list_del;
} }
get_device(&dev_info->dev); get_device(&dev_info->dev);
rc = device_create_file(&dev_info->dev, &dev_attr_shared); rc = device_create_file(&dev_info->dev, &dev_attr_shared);
if (rc) if (rc)
goto unregister_dev; goto unregister_dev;
rc = device_create_file(&dev_info->dev, &dev_attr_save); rc = device_create_file(&dev_info->dev, &dev_attr_save);
if (rc)
goto unregister_dev;
rc = device_create_file(&dev_info->dev, &dev_attr_seglist);
if (rc) if (rc)
goto unregister_dev; goto unregister_dev;
@ -434,7 +672,6 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
set_disk_ro(dev_info->gd,0); set_disk_ro(dev_info->gd,0);
break; break;
} }
PRINT_DEBUG("Segment %s loaded successfully\n", local_buf);
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
rc = count; rc = count;
goto out; goto out;
@ -445,20 +682,27 @@ unregister_dev:
dev_info->gd->queue = NULL; dev_info->gd->queue = NULL;
put_disk(dev_info->gd); put_disk(dev_info->gd);
device_unregister(&dev_info->dev); device_unregister(&dev_info->dev);
segment_unload(dev_info->segment_name); list_for_each_entry(seg_info, &dev_info->seg_list, lh) {
segment_unload(seg_info->segment_name);
}
put_device(&dev_info->dev); put_device(&dev_info->dev);
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
goto out; goto out;
list_del: dev_list_del:
list_del(&dev_info->lh); list_del(&dev_info->lh);
up_write(&dcssblk_devices_sem); release_gd:
unload_seg:
segment_unload(local_buf);
dealloc_gendisk:
blk_cleanup_queue(dev_info->dcssblk_queue); blk_cleanup_queue(dev_info->dcssblk_queue);
dev_info->gd->queue = NULL; dev_info->gd->queue = NULL;
put_disk(dev_info->gd); put_disk(dev_info->gd);
free_dev_info: up_write(&dcssblk_devices_sem);
seg_list_del:
if (dev_info == NULL)
goto out;
list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) {
list_del(&seg_info->lh);
segment_unload(seg_info->segment_name);
kfree(seg_info);
}
kfree(dev_info); kfree(dev_info);
out: out:
kfree(local_buf); kfree(local_buf);
@ -473,6 +717,7 @@ static ssize_t
dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{ {
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
int rc, i; int rc, i;
char *local_buf; char *local_buf;
@ -499,26 +744,28 @@ dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const ch
dev_info = dcssblk_get_device_by_name(local_buf); dev_info = dcssblk_get_device_by_name(local_buf);
if (dev_info == NULL) { if (dev_info == NULL) {
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
PRINT_WARN("Segment %s is not loaded!\n", local_buf); PRINT_WARN("Device %s is not loaded!\n", local_buf);
rc = -ENODEV; rc = -ENODEV;
goto out_buf; goto out_buf;
} }
if (atomic_read(&dev_info->use_count) != 0) { if (atomic_read(&dev_info->use_count) != 0) {
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
PRINT_WARN("Segment %s is in use!\n", local_buf); PRINT_WARN("Device %s is in use!\n", local_buf);
rc = -EBUSY; rc = -EBUSY;
goto out_buf; goto out_buf;
} }
list_del(&dev_info->lh);
list_del(&dev_info->lh);
del_gendisk(dev_info->gd); del_gendisk(dev_info->gd);
blk_cleanup_queue(dev_info->dcssblk_queue); blk_cleanup_queue(dev_info->dcssblk_queue);
dev_info->gd->queue = NULL; dev_info->gd->queue = NULL;
put_disk(dev_info->gd); put_disk(dev_info->gd);
device_unregister(&dev_info->dev); device_unregister(&dev_info->dev);
segment_unload(dev_info->segment_name);
PRINT_DEBUG("Segment %s unloaded successfully\n", /* unload all related segments */
dev_info->segment_name); list_for_each_entry(entry, &dev_info->seg_list, lh)
segment_unload(entry->segment_name);
put_device(&dev_info->dev); put_device(&dev_info->dev);
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
@ -550,6 +797,7 @@ static int
dcssblk_release(struct inode *inode, struct file *filp) dcssblk_release(struct inode *inode, struct file *filp)
{ {
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
int rc; int rc;
dev_info = inode->i_bdev->bd_disk->private_data; dev_info = inode->i_bdev->bd_disk->private_data;
@ -560,9 +808,11 @@ dcssblk_release(struct inode *inode, struct file *filp)
down_write(&dcssblk_devices_sem); down_write(&dcssblk_devices_sem);
if (atomic_dec_and_test(&dev_info->use_count) if (atomic_dec_and_test(&dev_info->use_count)
&& (dev_info->save_pending)) { && (dev_info->save_pending)) {
PRINT_INFO("Segment %s became idle and is being saved now\n", PRINT_INFO("Device %s became idle and is being saved now\n",
dev_info->segment_name); dev_info->segment_name);
segment_save(dev_info->segment_name); list_for_each_entry(entry, &dev_info->seg_list, lh) {
segment_save(entry->segment_name);
}
dev_info->save_pending = 0; dev_info->save_pending = 0;
} }
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);
@ -602,7 +852,7 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
case SEG_TYPE_SC: case SEG_TYPE_SC:
/* cannot write to these segments */ /* cannot write to these segments */
if (bio_data_dir(bio) == WRITE) { if (bio_data_dir(bio) == WRITE) {
PRINT_WARN("rejecting write to ro segment %s\n", PRINT_WARN("rejecting write to ro device %s\n",
dev_name(&dev_info->dev)); dev_name(&dev_info->dev));
goto fail; goto fail;
} }
@ -658,7 +908,7 @@ static void
dcssblk_check_params(void) dcssblk_check_params(void)
{ {
int rc, i, j, k; int rc, i, j, k;
char buf[9]; char buf[DCSSBLK_PARM_LEN + 1];
struct dcssblk_dev_info *dev_info; struct dcssblk_dev_info *dev_info;
for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0');
@ -666,15 +916,16 @@ dcssblk_check_params(void)
for (j = i; (dcssblk_segments[j] != ',') && for (j = i; (dcssblk_segments[j] != ',') &&
(dcssblk_segments[j] != '\0') && (dcssblk_segments[j] != '\0') &&
(dcssblk_segments[j] != '(') && (dcssblk_segments[j] != '(') &&
(j - i) < 8; j++) (j < DCSSBLK_PARM_LEN); j++)
{ {
buf[j-i] = dcssblk_segments[j]; buf[j-i] = dcssblk_segments[j];
} }
buf[j-i] = '\0'; buf[j-i] = '\0';
rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i);
if ((rc >= 0) && (dcssblk_segments[j] == '(')) { if ((rc >= 0) && (dcssblk_segments[j] == '(')) {
for (k = 0; buf[k] != '\0'; k++) for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++)
buf[k] = toupper(buf[k]); buf[k] = toupper(buf[k]);
buf[k] = '\0';
if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { if (!strncmp(&dcssblk_segments[j], "(local)", 7)) {
down_read(&dcssblk_devices_sem); down_read(&dcssblk_devices_sem);
dev_info = dcssblk_get_device_by_name(buf); dev_info = dcssblk_get_device_by_name(buf);
@ -741,10 +992,12 @@ module_exit(dcssblk_exit);
module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444);
MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, "
"comma-separated list, each name max. 8 chars.\n" "comma-separated list, names in each set separated "
"Adding \"(local)\" to segment name equals echoing 0 to " "by commas are separated by colons, each set contains "
"/sys/devices/dcssblk/<segment name>/shared after loading " "names of contiguous segments and each name max. 8 chars.\n"
"the segment - \n" "Adding \"(local)\" to the end of each set equals echoing 0 "
"e.g. segments=\"mydcss1,mydcss2,mydcss3(local)\""); "to /sys/devices/dcssblk/<device name>/shared after loading "
"the contiguous segments - \n"
"e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\"");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");