Btrfs: Add new ioctl to add devices

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-28 15:29:42 -04:00
parent 8e7bf94fd5
commit 788f20eb5a
6 changed files with 108 additions and 0 deletions

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@ -551,6 +551,8 @@ struct btrfs_fs_info {
u64 data_alloc_profile;
u64 metadata_alloc_profile;
u64 system_alloc_profile;
void *bdev_holder;
};
/*

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@ -3070,6 +3070,27 @@ static int btrfs_ioctl_defrag(struct file *file)
return 0;
}
long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
{
struct btrfs_ioctl_vol_args *vol_args;
int ret;
vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
if (!vol_args)
return -ENOMEM;
if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
ret = -EFAULT;
goto out;
}
ret = btrfs_init_new_device(root, vol_args->name);
out:
kfree(vol_args);
return ret;
}
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@ -3082,6 +3103,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_defrag(file);
case BTRFS_IOC_RESIZE:
return btrfs_ioctl_resize(root, (void __user *)arg);
case BTRFS_IOC_ADD_DEV:
return btrfs_ioctl_add_dev(root, (void __user *)arg);
}
return -ENOTTY;

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@ -36,4 +36,10 @@ struct btrfs_ioctl_vol_args {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
struct btrfs_ioctl_vol_args)
#endif

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@ -388,6 +388,7 @@ int btrfs_get_sb_bdev(struct file_system_type *fs_type,
goto error;
}
btrfs_sb(s)->fs_info->bdev_holder = fs_type;
s->s_flags |= MS_ACTIVE;
}

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@ -19,6 +19,7 @@
#include <linux/bio.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/random.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
@ -592,6 +593,80 @@ out:
return ret;
}
int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
{
struct btrfs_trans_handle *trans;
struct btrfs_device *device;
struct block_device *bdev;
struct list_head *cur;
struct list_head *devices;
u64 total_bytes;
int ret = 0;
bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
if (!bdev) {
return -EIO;
}
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
devices = &root->fs_info->fs_devices->devices;
list_for_each(cur, devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
if (device->bdev == bdev) {
ret = -EEXIST;
goto out;
}
}
device = kzalloc(sizeof(*device), GFP_NOFS);
if (!device) {
/* we can safely leave the fs_devices entry around */
ret = -ENOMEM;
goto out_close_bdev;
}
device->barriers = 1;
generate_random_uuid(device->uuid);
spin_lock_init(&device->io_lock);
device->name = kstrdup(device_path, GFP_NOFS);
if (!device->name) {
kfree(device);
goto out_close_bdev;
}
device->io_width = root->sectorsize;
device->io_align = root->sectorsize;
device->sector_size = root->sectorsize;
device->total_bytes = i_size_read(bdev->bd_inode);
device->dev_root = root->fs_info->dev_root;
device->bdev = bdev;
ret = btrfs_add_device(trans, root, device);
if (ret)
goto out_close_bdev;
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
btrfs_set_super_total_bytes(&root->fs_info->super_copy,
total_bytes + device->total_bytes);
total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
btrfs_set_super_num_devices(&root->fs_info->super_copy,
total_bytes + 1);
list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
list_add(&device->dev_alloc_list,
&root->fs_info->fs_devices->alloc_list);
root->fs_info->fs_devices->num_devices++;
out:
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
return ret;
out_close_bdev:
close_bdev_excl(bdev);
goto out;
}
int btrfs_update_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device)
{

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@ -133,4 +133,5 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
u8 *uuid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
int btrfs_init_new_device(struct btrfs_root *root, char *path);
#endif