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Lines 408-414
static long int cowlo_readcowraw (struct
Link Here
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| 408 |
static long int cowlo_writecow (struct cowloop_device *, void *, int, loff_t); |
411 |
static long int cowlo_writecow (struct cowloop_device *, void *, int, loff_t); |
| 409 |
static long int cowlo_writecowraw(struct cowloop_device *, void *, int, loff_t); |
412 |
static long int cowlo_writecowraw(struct cowloop_device *, void *, int, loff_t); |
| 410 |
|
413 |
|
| 411 |
static int cowlo_ioctl (struct inode *, struct file *, |
414 |
static int cowlo_ioctl (struct block_device *, fmode_t, |
| 412 |
unsigned int, unsigned long); |
415 |
unsigned int, unsigned long); |
| 413 |
|
416 |
|
| 414 |
static int cowlo_makepair (struct cowpair __user *); |
417 |
static int cowlo_makepair (struct cowpair __user *); |
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Lines 434-441
static void cowlo_undo_opencow(struct co
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| 434 |
** < 0 - error value |
437 |
** < 0 - error value |
| 435 |
*/ |
438 |
*/ |
| 436 |
static int |
439 |
static int |
| 437 |
cowlo_open(struct inode *inode, struct file *file) |
440 |
cowlo_open(struct block_device *bdev, fmode_t mode) |
| 438 |
{ |
441 |
{ |
|
|
442 |
struct inode *inode = bdev->bd_inode; |
| 443 |
|
| 439 |
if (!inode) |
444 |
if (!inode) |
| 440 |
return -EINVAL; |
445 |
return -EINVAL; |
| 441 |
|
446 |
|
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Lines 474-483
cowlo_open(struct inode *inode, struct f
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| 474 |
** < 0 - error value |
479 |
** < 0 - error value |
| 475 |
*/ |
480 |
*/ |
| 476 |
static int |
481 |
static int |
| 477 |
cowlo_release(struct inode *inode, struct file *file) |
482 |
cowlo_release(struct gendisk *gd, fmode_t mode) |
| 478 |
{ |
483 |
{ |
|
|
484 |
struct block_device *bdev; |
| 485 |
struct inode *inode; |
| 479 |
int err = 0; |
486 |
int err = 0; |
| 480 |
|
487 |
|
|
|
488 |
bdev = bdget_disk(gd, 0); |
| 489 |
inode = bdev->bd_inode; |
| 490 |
|
| 481 |
if (!inode) |
491 |
if (!inode) |
| 482 |
return 0; |
492 |
return 0; |
| 483 |
|
493 |
|
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Lines 497-505
cowlo_release(struct inode *inode, struc
Link Here
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| 497 |
** < 0 - error value |
507 |
** < 0 - error value |
| 498 |
*/ |
508 |
*/ |
| 499 |
static int |
509 |
static int |
| 500 |
cowlo_ioctl(struct inode *inode, struct file *filp, |
510 |
cowlo_ioctl(struct block_device *bdev, fmode_t mode, |
| 501 |
unsigned int cmd, unsigned long arg) |
511 |
unsigned int cmd, unsigned long arg) |
| 502 |
{ |
512 |
{ |
|
|
513 |
struct inode *inode = bdev->bd_inode; |
| 503 |
struct hd_geometry geo; |
514 |
struct hd_geometry geo; |
| 504 |
|
515 |
|
| 505 |
DEBUGP(DCOW "cowloop - ioctl cmd %x\n", cmd); |
516 |
DEBUGP(DCOW "cowloop - ioctl cmd %x\n", cmd); |
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Lines 2067-2073
cowlo_openrdo(struct cowloop_device *cow
Link Here
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| 2067 |
cowdev->belowq = cowdev->belowgd->queue; |
2086 |
cowdev->belowq = cowdev->belowgd->queue; |
| 2068 |
|
2087 |
|
| 2069 |
if (cowdev->numblocks == 0) |
2088 |
if (cowdev->numblocks == 0) |
| 2070 |
cowdev->numblocks = cowdev->belowgd->capacity |
2089 |
cowdev->numblocks = get_capacity(cowdev->belowgd) |
| 2071 |
/ (MAPUNIT/512); |
2090 |
/ (MAPUNIT/512); |
| 2072 |
} |
2091 |
} |
| 2073 |
|
2092 |
|
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Lines 2639-2644
cowlo_init_module(void)
Link Here
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| 2639 |
{ |
2658 |
{ |
| 2640 |
int rv; |
2659 |
int rv; |
| 2641 |
int minor, uptocows; |
2660 |
int minor, uptocows; |
|
|
2661 |
spinlock_t ilock; /* Initial lock for the default queue assigned on load */ |
| 2642 |
|
2662 |
|
| 2643 |
revision[sizeof revision - 3] = '\0'; |
2663 |
revision[sizeof revision - 3] = '\0'; |
| 2644 |
|
2664 |
|
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Lines 2748-2754
cowlo_init_module(void)
Link Here
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| 2748 |
** allocate fake disk as control channel to handle the requests |
2768 |
** allocate fake disk as control channel to handle the requests |
| 2749 |
** to activate and deactivate cowdevices dynamically |
2769 |
** to activate and deactivate cowdevices dynamically |
| 2750 |
*/ |
2770 |
*/ |
| 2751 |
if ((cowctlgd = alloc_disk(1)) == NULL) { |
2771 |
if (!(cowctlgd = alloc_disk(1))) { |
| 2752 |
printk(KERN_WARNING |
2772 |
printk(KERN_WARNING |
| 2753 |
"cowloop - unable to alloc_disk for cowctl\n"); |
2773 |
"cowloop - unable to alloc_disk for cowctl\n"); |
| 2754 |
|
2774 |
|
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Lines 2759-2769
cowlo_init_module(void)
Link Here
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| 2759 |
goto error_out; |
2779 |
goto error_out; |
| 2760 |
} |
2780 |
} |
| 2761 |
|
2781 |
|
|
|
2782 |
spin_lock_init(&ilock); |
| 2783 |
|
| 2762 |
cowctlgd->major = COWMAJOR; |
2784 |
cowctlgd->major = COWMAJOR; |
| 2763 |
cowctlgd->first_minor = COWCTL; |
2785 |
cowctlgd->first_minor = COWCTL; |
| 2764 |
cowctlgd->minors = 1; |
2786 |
cowctlgd->minors = 1; |
| 2765 |
cowctlgd->fops = &cowlo_fops; |
2787 |
cowctlgd->fops = &cowlo_fops; |
| 2766 |
cowctlgd->private_data = NULL; |
2788 |
cowctlgd->private_data = NULL; |
|
|
2789 |
/* The device is of capacity 0, so there won't be any queue request */ |
| 2790 |
cowctlgd->queue = blk_init_queue(NULL, &ilock); |
| 2767 |
sprintf(cowctlgd->disk_name, "cowctl"); |
2791 |
sprintf(cowctlgd->disk_name, "cowctl"); |
| 2768 |
set_capacity(cowctlgd, 0); |
2792 |
set_capacity(cowctlgd, 0); |
| 2769 |
|
2793 |
|
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Lines 2817-2822
cowlo_cleanup_module(void)
Link Here
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| 2817 |
} |
2845 |
} |
| 2818 |
kfree(cowdevall); |
2846 |
kfree(cowdevall); |
| 2819 |
|
2847 |
|
|
|
2848 |
blk_cleanup_queue(cowctlgd->queue); /* cleanup the empty queue */ |
| 2820 |
del_gendisk(cowctlgd); /* revert the alloc_disk() */ |
2849 |
del_gendisk(cowctlgd); /* revert the alloc_disk() */ |
| 2821 |
put_disk (cowctlgd); /* revert the add_disk() */ |
2850 |
put_disk (cowctlgd); /* revert the add_disk() */ |
| 2822 |
|
2851 |
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