/* * 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 <linux/sort.h> #include "async-thread.h" #define BTRFS_STRIPE_LEN (64 * 1024) struct buffer_head; struct btrfs_pending_bios { struct bio *head; struct bio *tail; }; 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; /* regular prio bios */ struct btrfs_pending_bios pending_bios; /* WRITE_SYNC bios */ struct btrfs_pending_bios pending_sync_bios; int running_pending; u64 generation; int writeable; int in_fs_metadata; int missing; spinlock_t io_lock; struct block_device *bdev; /* the mode sent to blkdev_get */ fmode_t mode; char *name; /* the internal btrfs device id */ u64 devid; /* size of the device */ u64 total_bytes; /* size of the disk */ u64 disk_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 copy of the super */ u64 latest_devid; u64 latest_trans; u64 num_devices; u64 open_devices; u64 rw_devices; u64 missing_devices; u64 total_rw_bytes; struct block_device *latest_bdev; /* all of the devices in the FS, protected by a mutex * so we can safely walk it to write out the supers without * worrying about add/remove by the multi-device code */ struct mutex device_list_mutex; 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; /* set when we find or add a device that doesn't have the * nonrot flag set */ int rotating; }; struct btrfs_bio_stripe { struct btrfs_device *dev; u64 physical; u64 length; /* only used for discard mappings */ }; 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[]; }; struct btrfs_device_info { struct btrfs_device *dev; u64 dev_offset; u64 max_avail; }; struct map_lookup { u64 type; int io_align; int io_width; int stripe_len; int sector_size; int num_stripes; int sub_stripes; struct btrfs_bio_stripe stripes[]; }; /* Used to sort the devices by max_avail(descending sort) */ int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2); /* * sort the devices by max_avail, in which max free extent size of each device * is stored.(Descending Sort) */ static inline void btrfs_descending_sort_devices( struct btrfs_device_info *devices, size_t nr_devices) { sort(devices, nr_devices, sizeof(struct btrfs_device_info), btrfs_cmp_device_free_bytes, NULL); } int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, u64 end, u64 *length); #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); int find_free_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 num_bytes, u64 *start, u64 *max_avail); #endif