Btrfs: Add support for device scanning and detection ioctls
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 67ed216..9624923 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -44,6 +44,7 @@
#include "ioctl.h"
#include "print-tree.h"
#include "xattr.h"
+#include "volumes.h"
#define BTRFS_SUPER_MAGIC 0x9123683E
@@ -216,7 +217,9 @@
return 1;
}
-static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
+static int btrfs_fill_super(struct super_block * sb,
+ struct btrfs_fs_devices *fs_devices,
+ void * data, int silent)
{
struct inode * inode;
struct dentry * root_dentry;
@@ -231,7 +234,7 @@
sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
- tree_root = open_ctree(sb);
+ tree_root = open_ctree(sb, fs_devices);
if (!tree_root || IS_ERR(tree_root)) {
printk("btrfs: open_ctree failed\n");
@@ -334,18 +337,23 @@
int btrfs_get_sb_bdev(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
- int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt, const char *subvol)
{
struct block_device *bdev = NULL;
struct super_block *s;
struct dentry *root;
+ struct btrfs_fs_devices *fs_devices = NULL;
int error = 0;
- bdev = open_bdev_excl(dev_name, flags, fs_type);
- if (IS_ERR(bdev))
- return PTR_ERR(bdev);
+ error = btrfs_scan_one_device(dev_name, flags, fs_type, &fs_devices);
+ if (error)
+ return error;
+ error = btrfs_open_devices(fs_devices, flags, fs_type);
+ if (error)
+ return error;
+
+ bdev = fs_devices->lowest_bdev;
/*
* once the super is inserted into the list by sget, s_umount
* will protect the lockfs code from trying to start a snapshot
@@ -372,7 +380,8 @@
s->s_flags = flags;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(bdev));
- error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
+ error = btrfs_fill_super(s, fs_devices, data,
+ flags & MS_SILENT ? 1 : 0);
if (error) {
up_write(&s->s_umount);
deactivate_super(s);
@@ -408,7 +417,7 @@
error_s:
error = PTR_ERR(s);
error_bdev:
- close_bdev_excl(bdev);
+ btrfs_close_devices(fs_devices);
error:
return error;
}
@@ -421,8 +430,7 @@
char *subvol_name = NULL;
parse_options((char *)data, NULL, &subvol_name);
- ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data,
- btrfs_fill_super, mnt,
+ ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data, mnt,
subvol_name ? subvol_name : "default");
if (subvol_name)
kfree(subvol_name);
@@ -445,13 +453,6 @@
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",
@@ -460,6 +461,31 @@
.fs_flags = FS_REQUIRES_DEV,
};
+static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct btrfs_ioctl_vol_args *vol;
+ struct btrfs_fs_devices *fs_devices;
+ int ret;
+ int len;
+
+ vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+ if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
+ switch (cmd) {
+ case BTRFS_IOC_SCAN_DEV:
+ ret = btrfs_scan_one_device(vol->name, MS_RDONLY,
+ &btrfs_fs_type, &fs_devices);
+ break;
+ }
+out:
+ kfree(vol);
+ return 0;
+}
+
static void btrfs_write_super_lockfs(struct super_block *sb)
{
struct btrfs_root *root = btrfs_sb(sb);
@@ -567,6 +593,7 @@
btrfs_interface_exit();
unregister_filesystem(&btrfs_fs_type);
btrfs_exit_sysfs();
+ btrfs_cleanup_fs_uuids();
}
module_init(init_btrfs_fs)
