268 lines
7.1 KiB
C
268 lines
7.1 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_VOLUMES_
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#define __BTRFS_VOLUMES_
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#include <linux/bio.h>
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#include <linux/sort.h>
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#include "async-thread.h"
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#define BTRFS_STRIPE_LEN (64 * 1024)
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struct buffer_head;
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struct btrfs_pending_bios {
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struct bio *head;
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struct bio *tail;
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};
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struct btrfs_device {
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struct list_head dev_list;
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struct list_head dev_alloc_list;
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struct btrfs_fs_devices *fs_devices;
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struct btrfs_root *dev_root;
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/* regular prio bios */
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struct btrfs_pending_bios pending_bios;
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/* WRITE_SYNC bios */
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struct btrfs_pending_bios pending_sync_bios;
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int running_pending;
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u64 generation;
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int writeable;
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int in_fs_metadata;
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int missing;
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int can_discard;
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spinlock_t io_lock;
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struct block_device *bdev;
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/* the mode sent to blkdev_get */
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fmode_t mode;
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char *name;
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/* the internal btrfs device id */
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u64 devid;
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/* size of the device */
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u64 total_bytes;
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/* size of the disk */
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u64 disk_total_bytes;
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/* bytes used */
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u64 bytes_used;
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/* optimal io alignment for this device */
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u32 io_align;
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/* optimal io width for this device */
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u32 io_width;
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/* minimal io size for this device */
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u32 sector_size;
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/* type and info about this device */
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u64 type;
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/* physical drive uuid (or lvm uuid) */
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u8 uuid[BTRFS_UUID_SIZE];
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/* per-device scrub information */
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struct scrub_dev *scrub_device;
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struct btrfs_work work;
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struct rcu_head rcu;
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struct work_struct rcu_work;
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/* readahead state */
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spinlock_t reada_lock;
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atomic_t reada_in_flight;
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u64 reada_next;
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struct reada_zone *reada_curr_zone;
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struct radix_tree_root reada_zones;
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struct radix_tree_root reada_extents;
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/* for sending down flush barriers */
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struct bio *flush_bio;
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struct completion flush_wait;
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int nobarriers;
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};
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struct btrfs_fs_devices {
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u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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/* the device with this id has the most recent copy of the super */
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u64 latest_devid;
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u64 latest_trans;
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u64 num_devices;
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u64 open_devices;
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u64 rw_devices;
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u64 missing_devices;
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u64 total_rw_bytes;
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u64 num_can_discard;
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struct block_device *latest_bdev;
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/* all of the devices in the FS, protected by a mutex
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* so we can safely walk it to write out the supers without
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* worrying about add/remove by the multi-device code
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*/
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struct mutex device_list_mutex;
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struct list_head devices;
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/* devices not currently being allocated */
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struct list_head alloc_list;
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struct list_head list;
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struct btrfs_fs_devices *seed;
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int seeding;
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int opened;
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/* set when we find or add a device that doesn't have the
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* nonrot flag set
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*/
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int rotating;
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};
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struct btrfs_bio_stripe {
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struct btrfs_device *dev;
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u64 physical;
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u64 length; /* only used for discard mappings */
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};
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struct btrfs_bio;
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typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
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struct btrfs_bio {
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atomic_t stripes_pending;
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bio_end_io_t *end_io;
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struct bio *orig_bio;
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void *private;
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atomic_t error;
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int max_errors;
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int num_stripes;
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int mirror_num;
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struct btrfs_bio_stripe stripes[];
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};
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struct btrfs_device_info {
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struct btrfs_device *dev;
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u64 dev_offset;
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u64 max_avail;
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u64 total_avail;
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};
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struct map_lookup {
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u64 type;
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int io_align;
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int io_width;
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int stripe_len;
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int sector_size;
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int num_stripes;
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int sub_stripes;
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struct btrfs_bio_stripe stripes[];
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};
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#define map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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/*
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* Restriper's general type filter
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*/
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#define BTRFS_BALANCE_DATA (1ULL << 0)
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#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
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#define BTRFS_BALANCE_METADATA (1ULL << 2)
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#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
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BTRFS_BALANCE_SYSTEM | \
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BTRFS_BALANCE_METADATA)
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/*
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* Balance filters
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*/
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#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
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#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
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#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
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#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
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#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
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struct btrfs_balance_args;
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struct btrfs_balance_control {
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struct btrfs_fs_info *fs_info;
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struct btrfs_balance_args data;
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struct btrfs_balance_args meta;
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struct btrfs_balance_args sys;
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u64 flags;
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};
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int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
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u64 end, u64 *length);
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#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device,
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u64 chunk_tree, u64 chunk_objectid,
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u64 chunk_offset, u64 start, u64 num_bytes);
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int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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u64 logical, u64 *length,
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struct btrfs_bio **bbio_ret, int mirror_num);
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int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
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u64 chunk_start, u64 physical, u64 devid,
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u64 **logical, int *naddrs, int *stripe_len);
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int btrfs_read_sys_array(struct btrfs_root *root);
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int btrfs_read_chunk_tree(struct btrfs_root *root);
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int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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struct btrfs_root *extent_root, u64 type);
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void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
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void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
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int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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int mirror_num, int async_submit);
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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fmode_t flags, void *holder);
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int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
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struct btrfs_fs_devices **fs_devices_ret);
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int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
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int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
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int btrfs_add_device(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_device *device);
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int btrfs_rm_device(struct btrfs_root *root, char *device_path);
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int btrfs_cleanup_fs_uuids(void);
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int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
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int btrfs_grow_device(struct btrfs_trans_handle *trans,
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struct btrfs_device *device, u64 new_size);
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struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
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u8 *uuid, u8 *fsid);
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int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
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int btrfs_init_new_device(struct btrfs_root *root, char *path);
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int btrfs_balance(struct btrfs_balance_control *bctl,
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struct btrfs_ioctl_balance_args *bargs);
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int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
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int find_free_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device, u64 num_bytes,
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u64 *start, u64 *max_avail);
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#endif
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