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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 16:03:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 16:03:40 -0700
commit548453fd107f789f5f1bc2dc13cc432ceb3b5efd (patch)
treedc5a62d49260d66b7390ef110113134e3bef9152 /drivers/block/loop.c
parent9fd91217b15751997cab35ad309b37b44eaa6774 (diff)
parentfb199746303a6bfd6121834ec9e810471185c530 (diff)
Merge branch 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block: block: fix blk_register_queue() return value block: fix memory hotplug and bouncing in block layer block: replace remaining __FUNCTION__ occurrences Kconfig: clean up block/Kconfig help descriptions cciss: fix warning oops on rmmod of driver cciss: Fix race between disk-adding code and interrupt handler block: move the padding adjustment to blk_rq_map_sg block: add bio_copy_user_iov support to blk_rq_map_user_iov block: convert bio_copy_user to bio_copy_user_iov loop: manage partitions in disk image cdrom: use kmalloced buffers instead of buffers on stack cdrom: make unregister_cdrom() return void cdrom: use list_head for cdrom_device_info list cdrom: protect cdrom_device_info list by mutex cdrom: cleanup hardcoded error-code cdrom: remove ifdef CONFIG_SYSCTL
Diffstat (limited to 'drivers/block/loop.c')
-rw-r--r--drivers/block/loop.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 91ebb007416..f7f163557aa 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -82,6 +82,9 @@
static LIST_HEAD(loop_devices);
static DEFINE_MUTEX(loop_devices_mutex);
+static int max_part;
+static int part_shift;
+
/*
* Transfer functions
*/
@@ -692,6 +695,8 @@ static int loop_change_fd(struct loop_device *lo, struct file *lo_file,
goto out_putf;
fput(old_file);
+ if (max_part > 0)
+ ioctl_by_bdev(bdev, BLKRRPART, 0);
return 0;
out_putf:
@@ -819,6 +824,8 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
}
lo->lo_state = Lo_bound;
wake_up_process(lo->lo_thread);
+ if (max_part > 0)
+ ioctl_by_bdev(bdev, BLKRRPART, 0);
return 0;
out_clr:
@@ -919,6 +926,8 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
fput(filp);
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
+ if (max_part > 0)
+ ioctl_by_bdev(bdev, BLKRRPART, 0);
return 0;
}
@@ -1360,6 +1369,8 @@ static struct block_device_operations lo_fops = {
static int max_loop;
module_param(max_loop, int, 0);
MODULE_PARM_DESC(max_loop, "Maximum number of loop devices");
+module_param(max_part, int, 0);
+MODULE_PARM_DESC(max_part, "Maximum number of partitions per loop device");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(LOOP_MAJOR);
@@ -1412,7 +1423,7 @@ static struct loop_device *loop_alloc(int i)
if (!lo->lo_queue)
goto out_free_dev;
- disk = lo->lo_disk = alloc_disk(1);
+ disk = lo->lo_disk = alloc_disk(1 << part_shift);
if (!disk)
goto out_free_queue;
@@ -1422,7 +1433,7 @@ static struct loop_device *loop_alloc(int i)
init_waitqueue_head(&lo->lo_event);
spin_lock_init(&lo->lo_lock);
disk->major = LOOP_MAJOR;
- disk->first_minor = i;
+ disk->first_minor = i << part_shift;
disk->fops = &lo_fops;
disk->private_data = lo;
disk->queue = lo->lo_queue;
@@ -1502,7 +1513,12 @@ static int __init loop_init(void)
* themselves and have kernel automatically instantiate actual
* device on-demand.
*/
- if (max_loop > 1UL << MINORBITS)
+
+ part_shift = 0;
+ if (max_part > 0)
+ part_shift = fls(max_part);
+
+ if (max_loop > 1UL << (MINORBITS - part_shift))
return -EINVAL;
if (max_loop) {
@@ -1510,7 +1526,7 @@ static int __init loop_init(void)
range = max_loop;
} else {
nr = 8;
- range = 1UL << MINORBITS;
+ range = 1UL << (MINORBITS - part_shift);
}
if (register_blkdev(LOOP_MAJOR, "loop"))
@@ -1549,7 +1565,7 @@ static void __exit loop_exit(void)
unsigned long range;
struct loop_device *lo, *next;
- range = max_loop ? max_loop : 1UL << MINORBITS;
+ range = max_loop ? max_loop : 1UL << (MINORBITS - part_shift);
list_for_each_entry_safe(lo, next, &loop_devices, lo_list)
loop_del_one(lo);