extern struct kmem_cache *btrfs_bit_radix_cachep;
extern struct kmem_cache *btrfs_path_cachep;
-#define BTRFS_MAGIC "_B4RfS_M"
+#define BTRFS_MAGIC "_B5RfS_M"
#define BTRFS_MAX_LEVEL 8
__le64 total_bytes;
__le64 bytes_used;
__le64 root_dir_objectid;
+ __le64 num_devices;
__le32 sectorsize;
__le32 nodesize;
__le32 leafsize;
};
struct btrfs_device;
+struct btrfs_fs_devices;
struct btrfs_fs_info {
u8 fsid[BTRFS_FSID_SIZE];
struct btrfs_root *extent_root;
u64 total_pinned;
struct list_head dirty_cowonly_roots;
- struct list_head devices;
+ struct btrfs_fs_devices *fs_devices;
struct list_head space_info;
spinlock_t delalloc_lock;
spinlock_t new_trans_lock;
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
+
static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
return (char *)d + offsetof(struct btrfs_dev_item, uuid);
stripesize, 32);
BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
root_dir_objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
+ num_devices, 64);
static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
{
struct list_head *next;
struct btrfs_device *device;
- list = &fs_info->devices;
- while(!list_empty(list)) {
- next = list->next;
- list_del(next);
+ list = &fs_info->fs_devices->devices;
+ list_for_each(next, list) {
device = list_entry(next, struct btrfs_device, dev_list);
- kfree(device);
+ if (device->bdev && device->bdev != fs_info->sb->s_bdev)
+ close_bdev_excl(device->bdev);
+ device->bdev = NULL;
}
return 0;
}
return 0;
}
#endif
-struct btrfs_root *open_ctree(struct super_block *sb)
+struct btrfs_root *open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices)
{
u32 sectorsize;
u32 nodesize;
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
fs_info->dev_root = dev_root;
+ fs_info->fs_devices = fs_devices;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
- INIT_LIST_HEAD(&fs_info->devices);
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
fs_info->sb = sb;
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
+ if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
+ printk("Btrfs: wanted %llu devices, but found %llu\n",
+ (unsigned long long)btrfs_super_num_devices(disk_super),
+ (unsigned long long)fs_devices->num_devices);
+ goto fail_sb_buffer;
+ }
nodesize = btrfs_super_nodesize(disk_super);
leafsize = btrfs_super_leafsize(disk_super);
sectorsize = btrfs_super_sectorsize(disk_super);
}
mutex_lock(&fs_info->fs_mutex);
- ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
- BUG_ON(ret);
ret = btrfs_read_sys_array(tree_root);
BUG_ON(ret);
fail_iput:
iput(fs_info->btree_inode);
fail:
+ close_all_devices(fs_info);
kfree(extent_root);
kfree(tree_root);
kfree(fs_info);
#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
struct btrfs_device;
+struct btrfs_fs_devices;
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize);
u64 bytenr, u32 blocksize);
int clean_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf);
-struct btrfs_root *open_ctree(struct super_block *sb);
+struct btrfs_root *open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices);
int close_ctree(struct btrfs_root *root);
int write_ctree_super(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_VOL_NAME_MAX 255
+#define BTRFS_PATH_NAME_MAX 4095
+
struct btrfs_ioctl_vol_args {
- char name[BTRFS_VOL_NAME_MAX + 1];
+ char name[BTRFS_PATH_NAME_MAX + 1];
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
struct btrfs_ioctl_vol_args)
+#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
+ struct btrfs_ioctl_vol_args)
#endif
#include "ioctl.h"
#include "print-tree.h"
#include "xattr.h"
+#include "volumes.h"
#define BTRFS_SUPER_MAGIC 0x9123683E
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;
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");
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
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);
error_s:
error = PTR_ERR(s);
error_bdev:
- close_bdev_excl(bdev);
+ btrfs_close_devices(fs_devices);
error:
return error;
}
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);
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",
.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);
btrfs_interface_exit();
unregister_filesystem(&btrfs_fs_type);
btrfs_exit_sysfs();
+ btrfs_cleanup_fs_uuids();
}
module_init(init_btrfs_fs)
*/
#include <linux/sched.h>
#include <linux/bio.h>
+#include <linux/buffer_head.h>
#include "ctree.h"
#include "extent_map.h"
#include "disk-io.h"
struct btrfs_device *dev;
u64 physical;
};
+static DEFINE_MUTEX(uuid_mutex);
+static LIST_HEAD(fs_uuids);
+
+int btrfs_cleanup_fs_uuids(void)
+{
+ struct btrfs_fs_devices *fs_devices;
+ struct list_head *uuid_cur;
+ struct list_head *devices_cur;
+ struct btrfs_device *dev;
+
+ list_for_each(uuid_cur, &fs_uuids) {
+ fs_devices = list_entry(uuid_cur, struct btrfs_fs_devices,
+ list);
+ while(!list_empty(&fs_devices->devices)) {
+ devices_cur = fs_devices->devices.next;
+ dev = list_entry(devices_cur, struct btrfs_device,
+ dev_list);
+ printk("uuid cleanup finds %s\n", dev->name);
+ if (dev->bdev) {
+ printk("closing\n");
+ close_bdev_excl(dev->bdev);
+ }
+ list_del(&dev->dev_list);
+ kfree(dev);
+ }
+ }
+ return 0;
+}
+
+static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
+{
+ struct btrfs_device *dev;
+ struct list_head *cur;
+
+ list_for_each(cur, head) {
+ dev = list_entry(cur, struct btrfs_device, dev_list);
+ if (dev->devid == devid)
+ return dev;
+ }
+ return NULL;
+}
+
+static struct btrfs_fs_devices *find_fsid(u8 *fsid)
+{
+ struct list_head *cur;
+ struct btrfs_fs_devices *fs_devices;
+
+ list_for_each(cur, &fs_uuids) {
+ fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
+ if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
+ return fs_devices;
+ }
+ return NULL;
+}
+
+static int device_list_add(const char *path,
+ struct btrfs_super_block *disk_super,
+ u64 devid, struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices;
+ u64 found_transid = btrfs_super_generation(disk_super);
+
+ fs_devices = find_fsid(disk_super->fsid);
+ if (!fs_devices) {
+ fs_devices = kmalloc(sizeof(*fs_devices), GFP_NOFS);
+ if (!fs_devices)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&fs_devices->devices);
+ list_add(&fs_devices->list, &fs_uuids);
+ memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ fs_devices->lowest_devid = (u64)-1;
+ fs_devices->num_devices = 0;
+ device = NULL;
+ } else {
+ device = __find_device(&fs_devices->devices, devid);
+ }
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device) {
+ /* we can safely leave the fs_devices entry around */
+ return -ENOMEM;
+ }
+ device->devid = devid;
+ device->name = kstrdup(path, GFP_NOFS);
+ if (!device->name) {
+ kfree(device);
+ return -ENOMEM;
+ }
+ list_add(&device->dev_list, &fs_devices->devices);
+ fs_devices->num_devices++;
+ }
+
+ if (found_transid > fs_devices->latest_trans) {
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ }
+ if (fs_devices->lowest_devid > devid) {
+ fs_devices->lowest_devid = devid;
+ printk("lowest devid now %Lu\n", devid);
+ }
+ *fs_devices_ret = fs_devices;
+ return 0;
+}
+
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+
+ mutex_lock(&uuid_mutex);
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if (device->bdev) {
+ close_bdev_excl(device->bdev);
+ printk("close devices closes %s\n", device->name);
+ }
+ device->bdev = NULL;
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+}
+
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
+ int flags, void *holder)
+{
+ struct block_device *bdev;
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ bdev = open_bdev_excl(device->name, flags, holder);
+printk("opening %s devid %Lu\n", device->name, device->devid);
+ if (IS_ERR(bdev)) {
+ printk("open %s failed\n", device->name);
+ ret = PTR_ERR(bdev);
+ goto fail;
+ }
+ if (device->devid == fs_devices->latest_devid)
+ fs_devices->latest_bdev = bdev;
+ if (device->devid == fs_devices->lowest_devid) {
+ fs_devices->lowest_bdev = bdev;
+printk("lowest bdev %s\n", device->name);
+ }
+ device->bdev = bdev;
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+fail:
+ mutex_unlock(&uuid_mutex);
+ btrfs_close_devices(fs_devices);
+ return ret;
+}
+
+int btrfs_scan_one_device(const char *path, int flags, void *holder,
+ struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_super_block *disk_super;
+ struct block_device *bdev;
+ struct buffer_head *bh;
+ int ret;
+ u64 devid;
+
+ mutex_lock(&uuid_mutex);
+
+ printk("scan one opens %s\n", path);
+ bdev = open_bdev_excl(path, flags, holder);
+
+ if (IS_ERR(bdev)) {
+ printk("open failed\n");
+ ret = PTR_ERR(bdev);
+ goto error;
+ }
+
+ ret = set_blocksize(bdev, 4096);
+ if (ret)
+ goto error_close;
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh) {
+ ret = -EIO;
+ goto error_close;
+ }
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ printk("no btrfs found on %s\n", path);
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ printk("found device %Lu on %s\n", devid, path);
+ ret = device_list_add(path, disk_super, devid, fs_devices_ret);
+
+error_brelse:
+ brelse(bh);
+error_close:
+ close_bdev_excl(bdev);
+ printk("scan one closes bdev %s\n", path);
+error:
+ mutex_unlock(&uuid_mutex);
+ return ret;
+}
/*
* this uses a pretty simple search, the expectation is that it is
/* FIXME use last free of some kind */
+ /* we don't want to overwrite the superblock on the drive,
+ * so we make sure to start at an offset of at least 1MB
+ */
+ search_start = max((u64)1024 * 1024, search_start);
key.objectid = device->devid;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
leaf = path->nodes[0];
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
+ device->devid = free_devid;
btrfs_set_device_id(leaf, dev_item, device->devid);
btrfs_set_device_type(leaf, dev_item, device->type);
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
struct btrfs_device *device = NULL;
struct btrfs_chunk *chunk;
struct list_head private_devs;
- struct list_head *dev_list = &extent_root->fs_info->devices;
+ struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
struct list_head *cur;
struct extent_map_tree *em_tree;
struct map_lookup *map;
key.objectid,
calc_size, &dev_offset);
BUG_ON(ret);
-
+printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
{
- struct btrfs_device *dev;
- struct list_head *cur = root->fs_info->devices.next;
- struct list_head *head = &root->fs_info->devices;
+ struct list_head *head = &root->fs_info->fs_devices->devices;
- while(cur != head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
- if (dev->devid == devid)
- return dev;
- cur = cur->next;
- }
- return NULL;
+ return __find_device(head, devid);
}
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
devid = btrfs_device_id(leaf, dev_item);
device = btrfs_find_device(root, devid);
if (!device) {
+ printk("warning devid %Lu not found already\n", devid);
device = kmalloc(sizeof(*device), GFP_NOFS);
if (!device)
return -ENOMEM;
- list_add(&device->dev_list, &root->fs_info->devices);
+ list_add(&device->dev_list,
+ &root->fs_info->fs_devices->devices);
}
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
- device->bdev = root->fs_info->sb->s_bdev;
ret = 0;
#if 0
ret = btrfs_open_device(device);
struct block_device *bdev;
+ char *name;
+
/* the internal btrfs device id */
u64 devid;
u8 uuid[BTRFS_DEV_UUID_SIZE];
};
+struct btrfs_fs_devices {
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+
+ /* the device with this id has the most recent coyp of the super */
+ u64 latest_devid;
+ u64 latest_trans;
+ u64 lowest_devid;
+ u64 num_devices;
+ struct block_device *latest_bdev;
+ struct block_device *lowest_bdev;
+ struct list_head devices;
+ struct list_head list;
+};
+
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev);
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
+ int flags, void *holder);
+int btrfs_scan_one_device(const char *path, int flags, void *holder,
+ struct btrfs_fs_devices **fs_devices_ret);
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
+int btrfs_add_device(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_device *device);
+int btrfs_cleanup_fs_uuids(void);
#endif
projects / platform / kernel / linux-3.10.git / commitdiff