530 lines
16 KiB
C
530 lines
16 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 <linux/btrfs.h>
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#include "async-thread.h"
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extern struct mutex uuid_mutex;
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#define BTRFS_STRIPE_LEN SZ_64K
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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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/*
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* Use sequence counter to get consistent device stat data on
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* 32-bit processors.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#include <linux/seqlock.h>
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#define __BTRFS_NEED_DEVICE_DATA_ORDERED
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#define btrfs_device_data_ordered_init(device) \
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seqcount_init(&device->data_seqcount)
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#else
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#define btrfs_device_data_ordered_init(device) do { } while (0)
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#endif
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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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struct rcu_string *name;
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u64 generation;
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spinlock_t io_lock ____cacheline_aligned;
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int running_pending;
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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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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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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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int is_tgtdev_for_dev_replace;
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#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
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seqcount_t data_seqcount;
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#endif
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/* the internal btrfs device id */
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u64 devid;
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/* size of the device in memory */
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u64 total_bytes;
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/* size of the device on 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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/* type and info about this device */
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u64 type;
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/* minimal io size for this device */
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u32 sector_size;
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/* physical drive uuid (or lvm uuid) */
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u8 uuid[BTRFS_UUID_SIZE];
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/*
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* size of the device on the current transaction
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*
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* This variant is update when committing the transaction,
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* and protected by device_list_mutex
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*/
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u64 commit_total_bytes;
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/* bytes used on the current transaction */
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u64 commit_bytes_used;
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/*
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* used to manage the device which is resized
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*
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* It is protected by chunk_lock.
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*/
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struct list_head resized_list;
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/* for sending down flush barriers */
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int nobarriers;
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struct bio *flush_bio;
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struct completion flush_wait;
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/* per-device scrub information */
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struct scrub_ctx *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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/* disk I/O failure stats. For detailed description refer to
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* enum btrfs_dev_stat_values in ioctl.h */
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int dev_stats_valid;
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/* Counter to record the change of device stats */
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atomic_t dev_stats_ccnt;
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atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
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};
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/*
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* If we read those variants at the context of their own lock, we needn't
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* use the following helpers, reading them directly is safe.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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u64 size; \
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unsigned int seq; \
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\
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do { \
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seq = read_seqcount_begin(&dev->data_seqcount); \
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size = dev->name; \
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} while (read_seqcount_retry(&dev->data_seqcount, seq)); \
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return size; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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preempt_disable(); \
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write_seqcount_begin(&dev->data_seqcount); \
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dev->name = size; \
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write_seqcount_end(&dev->data_seqcount); \
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preempt_enable(); \
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}
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#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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u64 size; \
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\
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preempt_disable(); \
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size = dev->name; \
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preempt_enable(); \
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return size; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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preempt_disable(); \
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dev->name = size; \
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preempt_enable(); \
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}
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#else
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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return dev->name; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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dev->name = size; \
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}
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#endif
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BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
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BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
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BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
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struct btrfs_fs_devices {
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u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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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 total_devices;
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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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* Scrubbing super can kick off supers writing by holding
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* this mutex lock.
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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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struct list_head resized_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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struct btrfs_fs_info *fs_info;
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/* sysfs kobjects */
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struct kobject fsid_kobj;
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struct kobject *device_dir_kobj;
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struct completion kobj_unregister;
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};
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#define BTRFS_BIO_INLINE_CSUM_SIZE 64
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/*
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* we need the mirror number and stripe index to be passed around
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* the call chain while we are processing end_io (especially errors).
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* Really, what we need is a btrfs_bio structure that has this info
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* and is properly sized with its stripe array, but we're not there
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* quite yet. We have our own btrfs bioset, and all of the bios
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* we allocate are actually btrfs_io_bios. We'll cram as much of
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* struct btrfs_bio as we can into this over time.
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*/
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typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
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struct btrfs_io_bio {
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unsigned int mirror_num;
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unsigned int stripe_index;
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u64 logical;
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u8 *csum;
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u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
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u8 *csum_allocated;
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btrfs_io_bio_end_io_t *end_io;
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struct bio bio;
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};
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static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
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{
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return container_of(bio, struct btrfs_io_bio, bio);
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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 refs;
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atomic_t stripes_pending;
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struct btrfs_fs_info *fs_info;
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u64 map_type; /* get from map_lookup->type */
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bio_end_io_t *end_io;
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struct bio *orig_bio;
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unsigned long flags;
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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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int num_tgtdevs;
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int *tgtdev_map;
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/*
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* logical block numbers for the start of each stripe
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* The last one or two are p/q. These are sorted,
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* so raid_map[0] is the start of our full stripe
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*/
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u64 *raid_map;
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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 btrfs_raid_attr {
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int sub_stripes; /* sub_stripes info for map */
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int dev_stripes; /* stripes per dev */
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int devs_max; /* max devs to use */
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int devs_min; /* min devs needed */
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int tolerated_failures; /* max tolerated fail devs */
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int devs_increment; /* ndevs has to be a multiple of this */
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int ncopies; /* how many copies to data has */
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};
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extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
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extern const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES];
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extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES];
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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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u64 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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struct btrfs_balance_args;
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struct btrfs_balance_progress;
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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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struct btrfs_balance_progress stat;
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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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void btrfs_get_bbio(struct btrfs_bio *bbio);
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void btrfs_put_bbio(struct btrfs_bio *bbio);
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int btrfs_map_block(struct btrfs_fs_info *fs_info, int op,
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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_map_sblock(struct btrfs_fs_info *fs_info, int op,
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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 need_raid_map);
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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, 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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void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step);
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void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info,
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struct btrfs_device *device, struct btrfs_device *this_dev);
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int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
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char *device_path,
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struct btrfs_device **device);
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int btrfs_find_device_by_devspec(struct btrfs_root *root, u64 devid,
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char *devpath,
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struct btrfs_device **device);
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struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
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const u64 *devid,
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const u8 *uuid);
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int btrfs_rm_device(struct btrfs_root *root, char *device_path, u64 devid);
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void btrfs_cleanup_fs_uuids(void);
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int btrfs_num_copies(struct btrfs_fs_info *fs_info, 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_fs_info *fs_info, 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_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
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struct btrfs_device *srcdev,
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struct btrfs_device **device_out);
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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_resume_balance_async(struct btrfs_fs_info *fs_info);
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int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
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int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
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int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
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int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
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int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
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int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
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int find_free_dev_extent_start(struct btrfs_transaction *transaction,
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struct btrfs_device *device, u64 num_bytes,
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u64 search_start, u64 *start, u64 *max_avail);
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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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void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
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int btrfs_get_dev_stats(struct btrfs_root *root,
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struct btrfs_ioctl_get_dev_stats *stats);
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void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
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int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
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int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_fs_info *fs_info,
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struct btrfs_device *srcdev);
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void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info,
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struct btrfs_device *srcdev);
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void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
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struct btrfs_device *tgtdev);
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void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
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struct btrfs_device *tgtdev);
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void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path);
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int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
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u64 logical, u64 len, int mirror_num);
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unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
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struct btrfs_mapping_tree *map_tree,
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u64 logical);
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int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
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struct btrfs_root *extent_root,
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u64 chunk_offset, u64 chunk_size);
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int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 chunk_offset);
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static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
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{
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return atomic_read(&dev->dev_stats_ccnt);
|
|
}
|
|
|
|
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
atomic_inc(dev->dev_stat_values + index);
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
}
|
|
|
|
static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
return atomic_read(dev->dev_stat_values + index);
|
|
}
|
|
|
|
static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
int ret;
|
|
|
|
ret = atomic_xchg(dev->dev_stat_values + index, 0);
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
return ret;
|
|
}
|
|
|
|
static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
|
|
int index, unsigned long val)
|
|
{
|
|
atomic_set(dev->dev_stat_values + index, val);
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
}
|
|
|
|
static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
btrfs_dev_stat_set(dev, index, 0);
|
|
}
|
|
|
|
void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
|
|
void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
|
|
struct btrfs_transaction *transaction);
|
|
|
|
static inline void lock_chunks(struct btrfs_root *root)
|
|
{
|
|
mutex_lock(&root->fs_info->chunk_mutex);
|
|
}
|
|
|
|
static inline void unlock_chunks(struct btrfs_root *root)
|
|
{
|
|
mutex_unlock(&root->fs_info->chunk_mutex);
|
|
}
|
|
|
|
struct list_head *btrfs_get_fs_uuids(void);
|
|
void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
|
|
void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
|
|
|
|
#endif
|