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Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h new file mode 100644 index 000000000000..86c44e9ae110 --- /dev/null +++ b/fs/btrfs/volumes.h @@ -0,0 +1,162 @@ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef __BTRFS_VOLUMES_ +#define __BTRFS_VOLUMES_ + +#include <linux/bio.h> +#include "async-thread.h" + +struct buffer_head; +struct btrfs_device { + struct list_head dev_list; + struct list_head dev_alloc_list; + struct btrfs_fs_devices *fs_devices; + struct btrfs_root *dev_root; + struct bio *pending_bios; + struct bio *pending_bio_tail; + int running_pending; + u64 generation; + + int barriers; + int writeable; + int in_fs_metadata; + + spinlock_t io_lock; + + struct block_device *bdev; + + /* the mode sent to open_bdev_exclusive */ + fmode_t mode; + + char *name; + + /* the internal btrfs device id */ + u64 devid; + + /* size of the device */ + u64 total_bytes; + + /* bytes used */ + u64 bytes_used; + + /* optimal io alignment for this device */ + u32 io_align; + + /* optimal io width for this device */ + u32 io_width; + + /* minimal io size for this device */ + u32 sector_size; + + /* type and info about this device */ + u64 type; + + /* physical drive uuid (or lvm uuid) */ + u8 uuid[BTRFS_UUID_SIZE]; + + struct btrfs_work work; +}; + +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 num_devices; + u64 open_devices; + u64 rw_devices; + u64 total_rw_bytes; + struct block_device *latest_bdev; + /* all of the devices in the FS */ + struct list_head devices; + + /* devices not currently being allocated */ + struct list_head alloc_list; + struct list_head list; + + struct btrfs_fs_devices *seed; + int seeding; + + int opened; +}; + +struct btrfs_bio_stripe { + struct btrfs_device *dev; + u64 physical; +}; + +struct btrfs_multi_bio { + atomic_t stripes_pending; + bio_end_io_t *end_io; + struct bio *orig_bio; + void *private; + atomic_t error; + int max_errors; + int num_stripes; + struct btrfs_bio_stripe stripes[]; +}; + +#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ + (sizeof(struct btrfs_bio_stripe) * (n))) + +int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, + struct btrfs_device *device, + u64 chunk_tree, u64 chunk_objectid, + u64 chunk_offset, u64 start, u64 num_bytes); +int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, + u64 logical, u64 *length, + struct btrfs_multi_bio **multi_ret, int mirror_num); +int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, + u64 chunk_start, u64 physical, u64 devid, + u64 **logical, int *naddrs, int *stripe_len); +int btrfs_read_sys_array(struct btrfs_root *root); +int btrfs_read_chunk_tree(struct btrfs_root *root); +int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, + struct btrfs_root *extent_root, u64 type); +void btrfs_mapping_init(struct btrfs_mapping_tree *tree); +void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); +int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, + int mirror_num, int async_submit); +int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); +int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, + fmode_t flags, void *holder); +int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, + struct btrfs_fs_devices **fs_devices_ret); +int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); +int btrfs_close_extra_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_rm_device(struct btrfs_root *root, char *device_path); +int btrfs_cleanup_fs_uuids(void); +int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); +int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, + u64 logical, struct page *page); +int btrfs_grow_device(struct btrfs_trans_handle *trans, + struct btrfs_device *device, u64 new_size); +struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, + u8 *uuid, u8 *fsid); +int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); +int btrfs_init_new_device(struct btrfs_root *root, char *path); +int btrfs_balance(struct btrfs_root *dev_root); +void btrfs_unlock_volumes(void); +void btrfs_lock_volumes(void); +int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); +#endif |