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608 lines
17 KiB
608 lines
17 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2007 Oracle. All rights reserved. |
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*/ |
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#ifndef BTRFS_VOLUMES_H |
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#define BTRFS_VOLUMES_H |
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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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#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) |
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extern struct mutex uuid_mutex; |
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#define BTRFS_STRIPE_LEN SZ_64K |
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struct btrfs_io_geometry { |
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/* remaining bytes before crossing a stripe */ |
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u64 len; |
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/* offset of logical address in chunk */ |
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u64 offset; |
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/* length of single IO stripe */ |
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u64 stripe_len; |
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/* number of stripe where address falls */ |
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u64 stripe_nr; |
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/* offset of address in stripe */ |
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u64 stripe_offset; |
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/* offset of raid56 stripe into the chunk */ |
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u64 raid56_stripe_offset; |
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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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#define BTRFS_DEV_STATE_WRITEABLE (0) |
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#define BTRFS_DEV_STATE_IN_FS_METADATA (1) |
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#define BTRFS_DEV_STATE_MISSING (2) |
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#define BTRFS_DEV_STATE_REPLACE_TGT (3) |
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#define BTRFS_DEV_STATE_FLUSH_SENT (4) |
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#define BTRFS_DEV_STATE_NO_READA (5) |
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struct btrfs_zoned_device_info; |
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struct btrfs_device { |
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struct list_head dev_list; /* device_list_mutex */ |
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struct list_head dev_alloc_list; /* chunk mutex */ |
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struct list_head post_commit_list; /* chunk mutex */ |
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struct btrfs_fs_devices *fs_devices; |
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struct btrfs_fs_info *fs_info; |
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struct rcu_string __rcu *name; |
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u64 generation; |
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struct block_device *bdev; |
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struct btrfs_zoned_device_info *zone_info; |
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/* the mode sent to blkdev_get */ |
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fmode_t mode; |
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unsigned long dev_state; |
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blk_status_t last_flush_error; |
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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 chunk 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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/* 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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/* per-device scrub information */ |
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struct scrub_ctx *scrub_ctx; |
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/* readahead state */ |
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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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struct extent_io_tree alloc_state; |
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struct completion kobj_unregister; |
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/* For sysfs/FSID/devinfo/devid/ */ |
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struct kobject devid_kobj; |
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/* Bandwidth limit for scrub, in bytes */ |
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u64 scrub_speed_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_PREEMPTION) |
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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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enum btrfs_chunk_allocation_policy { |
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BTRFS_CHUNK_ALLOC_REGULAR, |
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BTRFS_CHUNK_ALLOC_ZONED, |
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}; |
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/* |
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* Read policies for mirrored block group profiles, read picks the stripe based |
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* on these policies. |
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*/ |
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enum btrfs_read_policy { |
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/* Use process PID to choose the stripe */ |
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BTRFS_READ_POLICY_PID, |
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BTRFS_NR_READ_POLICY, |
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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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u8 metadata_uuid[BTRFS_FSID_SIZE]; |
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bool fsid_change; |
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struct list_head fs_list; |
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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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/* Highest generation number of seen devices */ |
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u64 latest_generation; |
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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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/* List of all devices, protected by device_list_mutex */ |
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struct list_head devices; |
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/* |
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* Devices which can satisfy space allocation. Protected by |
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* chunk_mutex |
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*/ |
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struct list_head alloc_list; |
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struct list_head seed_list; |
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bool 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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bool 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 *devices_kobj; |
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struct kobject *devinfo_kobj; |
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struct completion kobj_unregister; |
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enum btrfs_chunk_allocation_policy chunk_alloc_policy; |
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/* Policy used to read the mirrored stripes */ |
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enum btrfs_read_policy read_policy; |
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}; |
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#define BTRFS_BIO_INLINE_CSUM_SIZE 64 |
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#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ |
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- sizeof(struct btrfs_chunk)) \ |
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/ sizeof(struct btrfs_stripe) + 1) |
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#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ |
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- 2 * sizeof(struct btrfs_disk_key) \ |
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- 2 * sizeof(struct btrfs_chunk)) \ |
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/ sizeof(struct btrfs_stripe) + 1) |
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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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struct btrfs_io_bio { |
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unsigned int mirror_num; |
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struct btrfs_device *device; |
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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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struct bvec_iter iter; |
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/* |
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* This member must come last, bio_alloc_bioset will allocate enough |
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* bytes for entire btrfs_io_bio but relies on bio being last. |
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*/ |
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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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static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio) |
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{ |
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if (io_bio->csum != io_bio->csum_inline) { |
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kfree(io_bio->csum); |
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io_bio->csum = NULL; |
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} |
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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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refcount_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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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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u8 sub_stripes; /* sub_stripes info for map */ |
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u8 dev_stripes; /* stripes per dev */ |
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u8 devs_max; /* max devs to use */ |
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u8 devs_min; /* min devs needed */ |
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u8 tolerated_failures; /* max tolerated fail devs */ |
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u8 devs_increment; /* ndevs has to be a multiple of this */ |
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u8 ncopies; /* how many copies to data has */ |
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u8 nparity; /* number of stripes worth of bytes to store |
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* parity information */ |
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u8 mindev_error; /* error code if min devs requisite is unmet */ |
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const char raid_name[8]; /* name of the raid */ |
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u64 bg_flag; /* block group flag of the raid */ |
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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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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 num_stripes; |
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int sub_stripes; |
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int verified_stripes; /* For mount time dev extent verification */ |
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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_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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enum btrfs_map_op { |
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BTRFS_MAP_READ, |
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BTRFS_MAP_WRITE, |
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BTRFS_MAP_DISCARD, |
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BTRFS_MAP_GET_READ_MIRRORS, |
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}; |
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static inline enum btrfs_map_op btrfs_op(struct bio *bio) |
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{ |
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switch (bio_op(bio)) { |
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case REQ_OP_DISCARD: |
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return BTRFS_MAP_DISCARD; |
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case REQ_OP_WRITE: |
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case REQ_OP_ZONE_APPEND: |
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return BTRFS_MAP_WRITE; |
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default: |
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WARN_ON_ONCE(1); |
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fallthrough; |
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case REQ_OP_READ: |
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return BTRFS_MAP_READ; |
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} |
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} |
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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, enum btrfs_map_op 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, enum btrfs_map_op op, |
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u64 logical, u64 *length, |
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struct btrfs_bio **bbio_ret); |
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int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map, |
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enum btrfs_map_op op, u64 logical, |
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struct btrfs_io_geometry *io_geom); |
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int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); |
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int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); |
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int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type); |
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void btrfs_mapping_tree_free(struct extent_map_tree *tree); |
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blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, |
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int mirror_num); |
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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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struct btrfs_device *btrfs_scan_one_device(const char *path, |
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fmode_t flags, void *holder); |
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int btrfs_forget_devices(const char *path); |
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void btrfs_close_devices(struct btrfs_fs_devices *fs_devices); |
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void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices); |
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void btrfs_assign_next_active_device(struct btrfs_device *device, |
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struct btrfs_device *this_dev); |
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struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, |
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u64 devid, |
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const char *devpath); |
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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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void btrfs_free_device(struct btrfs_device *device); |
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int btrfs_rm_device(struct btrfs_fs_info *fs_info, |
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const char *device_path, u64 devid); |
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void __exit 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_devices *fs_devices, |
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u64 devid, 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_fs_info *fs_info, const char *path); |
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int btrfs_balance(struct btrfs_fs_info *fs_info, |
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struct btrfs_balance_control *bctl, |
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struct btrfs_ioctl_balance_args *bargs); |
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void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf); |
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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_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset); |
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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_uuid_scan_kthread(void *data); |
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int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset); |
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int find_free_dev_extent(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_fs_info *fs_info, |
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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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void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); |
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void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev); |
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void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); |
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int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, |
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u64 logical, u64 len); |
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unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, |
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u64 logical); |
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int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
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u64 chunk_offset, u64 chunk_size); |
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int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); |
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struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, |
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u64 logical, u64 length); |
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void btrfs_release_disk_super(struct btrfs_super_block *super); |
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static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, |
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int index) |
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{ |
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atomic_inc(dev->dev_stat_values + index); |
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/* |
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* This memory barrier orders stores updating statistics before stores |
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* updating dev_stats_ccnt. |
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* |
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* It pairs with smp_rmb() in btrfs_run_dev_stats(). |
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*/ |
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smp_mb__before_atomic(); |
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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); |
|
/* |
|
* atomic_xchg implies a full memory barriers as per atomic_t.txt: |
|
* - RMW operations that have a return value are fully ordered; |
|
* |
|
* This implicit memory barriers is paired with the smp_rmb in |
|
* btrfs_run_dev_stats |
|
*/ |
|
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); |
|
/* |
|
* This memory barrier orders stores updating statistics before stores |
|
* updating dev_stats_ccnt. |
|
* |
|
* It pairs with smp_rmb() in btrfs_run_dev_stats(). |
|
*/ |
|
smp_mb__before_atomic(); |
|
atomic_inc(&dev->dev_stats_ccnt); |
|
} |
|
|
|
/* |
|
* Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which |
|
* can be used as index to access btrfs_raid_array[]. |
|
*/ |
|
static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags) |
|
{ |
|
if (flags & BTRFS_BLOCK_GROUP_RAID10) |
|
return BTRFS_RAID_RAID10; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1) |
|
return BTRFS_RAID_RAID1; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1C3) |
|
return BTRFS_RAID_RAID1C3; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1C4) |
|
return BTRFS_RAID_RAID1C4; |
|
else if (flags & BTRFS_BLOCK_GROUP_DUP) |
|
return BTRFS_RAID_DUP; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID0) |
|
return BTRFS_RAID_RAID0; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID5) |
|
return BTRFS_RAID_RAID5; |
|
else if (flags & BTRFS_BLOCK_GROUP_RAID6) |
|
return BTRFS_RAID_RAID6; |
|
|
|
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ |
|
} |
|
|
|
void btrfs_commit_device_sizes(struct btrfs_transaction *trans); |
|
|
|
struct list_head * __attribute_const__ btrfs_get_fs_uuids(void); |
|
bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, |
|
struct btrfs_device *failing_dev); |
|
void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, |
|
struct block_device *bdev, |
|
const char *device_path); |
|
|
|
int btrfs_bg_type_to_factor(u64 flags); |
|
const char *btrfs_bg_type_to_raid_name(u64 flags); |
|
int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); |
|
int btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); |
|
|
|
#endif
|
|
|