remove artificial software max_loop limit
Remove artificial maximum 256 loop device that can be created due to a legacy device number limit. Searching through lkml archive, there are several instances where users complained about the artificial limit that the loop driver impose. There is no reason to have such limit. This patch rid the limit entirely and make loop device and associated block queue instantiation on demand. With on-demand instantiation, it also gives the benefit of not wasting memory if these devices are not in use (compare to current implementation that always create 8 loop devices), a net improvement in both areas. This version is both tested with creation of large number of loop devices and is compatible with existing losetup/mount user land tools. There are a number of people who worked on this and provided valuable suggestions, in no particular order, by: Jens Axboe Jan Engelhardt Christoph Hellwig Thomas M Signed-off-by: Ken Chen <kenchen@google.com> Cc: Jan Engelhardt <jengelh@linux01.gwdg.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ken Chen
Linus Torvalds
parent
4f911d64e0
commit
7328508274
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@ -77,9 +77,8 @@
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#include <asm/uaccess.h>
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static int max_loop = 8;
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static struct loop_device *loop_dev;
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static struct gendisk **disks;
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static LIST_HEAD(loop_devices);
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static DEFINE_MUTEX(loop_devices_mutex);
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/*
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* Transfer functions
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@ -183,7 +182,7 @@ figure_loop_size(struct loop_device *lo)
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if (unlikely((loff_t)x != size))
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return -EFBIG;
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set_capacity(disks[lo->lo_number], x);
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set_capacity(lo->lo_disk, x);
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return 0;
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}
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@ -812,7 +811,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
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lo->lo_queue->queuedata = lo;
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lo->lo_queue->unplug_fn = loop_unplug;
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set_capacity(disks[lo->lo_number], size);
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set_capacity(lo->lo_disk, size);
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bd_set_size(bdev, size << 9);
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set_blocksize(bdev, lo_blocksize);
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@ -832,7 +831,7 @@ out_clr:
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lo->lo_device = NULL;
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lo->lo_backing_file = NULL;
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lo->lo_flags = 0;
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set_capacity(disks[lo->lo_number], 0);
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set_capacity(lo->lo_disk, 0);
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invalidate_bdev(bdev);
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bd_set_size(bdev, 0);
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mapping_set_gfp_mask(mapping, lo->old_gfp_mask);
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@ -918,7 +917,7 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
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memset(lo->lo_crypt_name, 0, LO_NAME_SIZE);
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memset(lo->lo_file_name, 0, LO_NAME_SIZE);
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invalidate_bdev(bdev);
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set_capacity(disks[lo->lo_number], 0);
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set_capacity(lo->lo_disk, 0);
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bd_set_size(bdev, 0);
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mapping_set_gfp_mask(filp->f_mapping, gfp);
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lo->lo_state = Lo_unbound;
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@ -1322,6 +1321,18 @@ static long lo_compat_ioctl(struct file *file, unsigned int cmd, unsigned long a
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}
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#endif
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static struct loop_device *loop_find_dev(int number)
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{
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struct loop_device *lo;
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list_for_each_entry(lo, &loop_devices, lo_list) {
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if (lo->lo_number == number)
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return lo;
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}
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return NULL;
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}
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static struct loop_device *loop_init_one(int i);
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static int lo_open(struct inode *inode, struct file *file)
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{
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struct loop_device *lo = inode->i_bdev->bd_disk->private_data;
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@ -1330,6 +1341,11 @@ static int lo_open(struct inode *inode, struct file *file)
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lo->lo_refcnt++;
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mutex_unlock(&lo->lo_ctl_mutex);
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mutex_lock(&loop_devices_mutex);
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if (!loop_find_dev(lo->lo_number + 1))
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loop_init_one(lo->lo_number + 1);
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mutex_unlock(&loop_devices_mutex);
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return 0;
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}
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@ -1357,8 +1373,9 @@ static struct block_device_operations lo_fops = {
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/*
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* And now the modules code and kernel interface.
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*/
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static int max_loop;
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module_param(max_loop, int, 0);
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MODULE_PARM_DESC(max_loop, "Maximum number of loop devices (1-256)");
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MODULE_PARM_DESC(max_loop, "obsolete, loop device is created on-demand");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_BLOCKDEV_MAJOR(LOOP_MAJOR);
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@ -1383,7 +1400,7 @@ int loop_unregister_transfer(int number)
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xfer_funcs[n] = NULL;
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for (lo = &loop_dev[0]; lo < &loop_dev[max_loop]; lo++) {
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list_for_each_entry(lo, &loop_devices, lo_list) {
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mutex_lock(&lo->lo_ctl_mutex);
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if (lo->lo_encryption == xfer)
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@ -1398,91 +1415,110 @@ int loop_unregister_transfer(int number)
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EXPORT_SYMBOL(loop_register_transfer);
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EXPORT_SYMBOL(loop_unregister_transfer);
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static struct loop_device *loop_init_one(int i)
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{
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struct loop_device *lo;
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struct gendisk *disk;
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lo = kzalloc(sizeof(*lo), GFP_KERNEL);
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if (!lo)
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goto out;
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lo->lo_queue = blk_alloc_queue(GFP_KERNEL);
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if (!lo->lo_queue)
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goto out_free_dev;
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disk = lo->lo_disk = alloc_disk(1);
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if (!disk)
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goto out_free_queue;
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mutex_init(&lo->lo_ctl_mutex);
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lo->lo_number = i;
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lo->lo_thread = NULL;
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init_waitqueue_head(&lo->lo_event);
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spin_lock_init(&lo->lo_lock);
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disk->major = LOOP_MAJOR;
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disk->first_minor = i;
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disk->fops = &lo_fops;
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disk->private_data = lo;
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disk->queue = lo->lo_queue;
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sprintf(disk->disk_name, "loop%d", i);
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add_disk(disk);
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list_add_tail(&lo->lo_list, &loop_devices);
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return lo;
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out_free_queue:
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blk_cleanup_queue(lo->lo_queue);
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out_free_dev:
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kfree(lo);
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out:
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return ERR_PTR(-ENOMEM);
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}
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static void loop_del_one(struct loop_device *lo)
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{
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del_gendisk(lo->lo_disk);
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blk_cleanup_queue(lo->lo_queue);
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put_disk(lo->lo_disk);
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list_del(&lo->lo_list);
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kfree(lo);
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}
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static struct kobject *loop_probe(dev_t dev, int *part, void *data)
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{
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unsigned int number = dev & MINORMASK;
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struct loop_device *lo;
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mutex_lock(&loop_devices_mutex);
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lo = loop_find_dev(number);
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if (lo == NULL)
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lo = loop_init_one(number);
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mutex_unlock(&loop_devices_mutex);
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*part = 0;
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if (IS_ERR(lo))
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return (void *)lo;
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else
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return &lo->lo_disk->kobj;
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}
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static int __init loop_init(void)
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{
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int i;
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if (max_loop < 1 || max_loop > 256) {
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printk(KERN_WARNING "loop: invalid max_loop (must be between"
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" 1 and 256), using default (8)\n");
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max_loop = 8;
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}
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struct loop_device *lo;
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if (register_blkdev(LOOP_MAJOR, "loop"))
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return -EIO;
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blk_register_region(MKDEV(LOOP_MAJOR, 0), 1UL << MINORBITS,
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THIS_MODULE, loop_probe, NULL, NULL);
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loop_dev = kmalloc(max_loop * sizeof(struct loop_device), GFP_KERNEL);
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if (!loop_dev)
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goto out_mem1;
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memset(loop_dev, 0, max_loop * sizeof(struct loop_device));
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lo = loop_init_one(0);
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if (IS_ERR(lo))
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goto out;
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disks = kmalloc(max_loop * sizeof(struct gendisk *), GFP_KERNEL);
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if (!disks)
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goto out_mem2;
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if (max_loop) {
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printk(KERN_INFO "loop: the max_loop option is obsolete "
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"and will be removed in March 2008\n");
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for (i = 0; i < max_loop; i++) {
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disks[i] = alloc_disk(1);
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if (!disks[i])
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goto out_mem3;
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}
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for (i = 0; i < max_loop; i++) {
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struct loop_device *lo = &loop_dev[i];
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struct gendisk *disk = disks[i];
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memset(lo, 0, sizeof(*lo));
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lo->lo_queue = blk_alloc_queue(GFP_KERNEL);
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if (!lo->lo_queue)
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goto out_mem4;
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mutex_init(&lo->lo_ctl_mutex);
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lo->lo_number = i;
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lo->lo_thread = NULL;
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init_waitqueue_head(&lo->lo_event);
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spin_lock_init(&lo->lo_lock);
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disk->major = LOOP_MAJOR;
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disk->first_minor = i;
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disk->fops = &lo_fops;
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sprintf(disk->disk_name, "loop%d", i);
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disk->private_data = lo;
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disk->queue = lo->lo_queue;
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}
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/* We cannot fail after we call this, so another loop!*/
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for (i = 0; i < max_loop; i++)
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add_disk(disks[i]);
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printk(KERN_INFO "loop: loaded (max %d devices)\n", max_loop);
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printk(KERN_INFO "loop: module loaded\n");
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return 0;
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out_mem4:
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while (i--)
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blk_cleanup_queue(loop_dev[i].lo_queue);
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i = max_loop;
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out_mem3:
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while (i--)
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put_disk(disks[i]);
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kfree(disks);
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out_mem2:
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kfree(loop_dev);
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out_mem1:
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out:
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unregister_blkdev(LOOP_MAJOR, "loop");
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printk(KERN_ERR "loop: ran out of memory\n");
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return -ENOMEM;
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}
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static void loop_exit(void)
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static void __exit loop_exit(void)
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{
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int i;
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struct loop_device *lo, *next;
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for (i = 0; i < max_loop; i++) {
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del_gendisk(disks[i]);
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blk_cleanup_queue(loop_dev[i].lo_queue);
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put_disk(disks[i]);
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}
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list_for_each_entry_safe(lo, next, &loop_devices, lo_list)
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loop_del_one(lo);
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blk_unregister_region(MKDEV(LOOP_MAJOR, 0), 1UL << MINORBITS);
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if (unregister_blkdev(LOOP_MAJOR, "loop"))
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printk(KERN_WARNING "loop: cannot unregister blkdev\n");
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kfree(disks);
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kfree(loop_dev);
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}
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module_init(loop_init);
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@ -64,6 +64,8 @@ struct loop_device {
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wait_queue_head_t lo_event;
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request_queue_t *lo_queue;
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struct gendisk *lo_disk;
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struct list_head lo_list;
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};
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#endif /* __KERNEL__ */
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