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Add /dev/btrfs-control for device scanning ioctls 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-03-24 15:02:04 -04:00
parent 7d1660d411
commit a9218f6b00
2 changed files with 40 additions and 5 deletions
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4
fs/btrfs/extent-tree.c
View File

@ -374,10 +374,6 @@ again:
found_group = cache;
goto found;
}
if (full_search) {
printk("failed on cache %Lu used %Lu total %Lu\n",
cache->key.objectid, used, cache->key.offset);
}
cond_resched();
}
if (!full_search) {

41
fs/btrfs/super.c
View File

@ -36,6 +36,7 @@
#include <linux/parser.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/miscdevice.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@ -444,6 +445,13 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
return 0;
}
static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
printk("btrfs control ioctl %d\n", cmd);
return 0;
}
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
@ -451,6 +459,7 @@ static struct file_system_type btrfs_fs_type = {
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static void btrfs_write_super_lockfs(struct super_block *sb)
{
struct btrfs_root *root = btrfs_sb(sb);
@ -482,6 +491,30 @@ static struct super_operations btrfs_super_ops = {
.write_super_lockfs = btrfs_write_super_lockfs,
.unlockfs = btrfs_unlockfs,
};
static const struct file_operations btrfs_ctl_fops = {
.unlocked_ioctl = btrfs_control_ioctl,
.compat_ioctl = btrfs_control_ioctl,
.owner = THIS_MODULE,
};
static struct miscdevice btrfs_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "btrfs-control",
.fops = &btrfs_ctl_fops
};
static int btrfs_interface_init(void)
{
return misc_register(&btrfs_misc);
}
void btrfs_interface_exit(void)
{
if (misc_deregister(&btrfs_misc) < 0)
printk("misc_deregister failed for control device");
}
static int __init init_btrfs_fs(void)
{
int err;
@ -503,11 +536,16 @@ static int __init init_btrfs_fs(void)
if (err)
goto free_extent_io;
err = register_filesystem(&btrfs_fs_type);
err = btrfs_interface_init();
if (err)
goto free_extent_map;
err = register_filesystem(&btrfs_fs_type);
if (err)
goto unregister_ioctl;
return 0;
unregister_ioctl:
btrfs_interface_exit();
free_extent_map:
extent_map_exit();
free_extent_io:
@ -526,6 +564,7 @@ static void __exit exit_btrfs_fs(void)
btrfs_destroy_cachep();
extent_map_exit();
extent_io_exit();
btrfs_interface_exit();
unregister_filesystem(&btrfs_fs_type);
btrfs_exit_sysfs();
}