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761 lines
22 KiB
761 lines
22 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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/* Used by sanity check for btrfs_raid_types. */ |
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#define const_ffs(n) (__builtin_ctzll(n) + 1) |
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/* |
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* The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires |
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* RAID0 always to be the lowest profile bit. |
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* Although it's part of on-disk format and should never change, do extra |
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* compile-time sanity checks. |
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*/ |
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static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) < |
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const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0)); |
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static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) > |
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ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK)); |
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/* ilog2() can handle both constants and variables */ |
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#define BTRFS_BG_FLAG_TO_INDEX(profile) \ |
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ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1)) |
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enum btrfs_raid_types { |
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/* SINGLE is the special one as it doesn't have on-disk bit. */ |
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BTRFS_RAID_SINGLE = 0, |
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BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0), |
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BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1), |
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BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP), |
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BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10), |
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BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5), |
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BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6), |
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BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3), |
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BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4), |
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BTRFS_NR_RAID_TYPES |
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}; |
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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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u32 stripe_len; |
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/* offset of address in stripe */ |
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u32 stripe_offset; |
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/* number of stripe where address falls */ |
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u64 stripe_nr; |
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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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/* |
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* Device's major-minor number. Must be set even if the device is not |
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* opened (bdev == NULL), unless the device is missing. |
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*/ |
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dev_t devt; |
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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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/* Bio used for flushing device 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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/* 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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* Block group or device which contains an active swapfile. Used for preventing |
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* unsafe operations while a swapfile is active. |
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* |
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* These are sorted on (ptr, inode) (note that a block group or device can |
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* contain more than one swapfile). We compare the pointer values because we |
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* don't actually care what the object is, we just need a quick check whether |
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* the object exists in the rbtree. |
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*/ |
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struct btrfs_swapfile_pin { |
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struct rb_node node; |
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void *ptr; |
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struct inode *inode; |
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/* |
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* If true, ptr points to a struct btrfs_block_group. Otherwise, ptr |
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* points to a struct btrfs_device. |
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*/ |
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bool is_block_group; |
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/* |
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* Only used when 'is_block_group' is true and it is the number of |
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* extents used by a swapfile for this block group ('ptr' field). |
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*/ |
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int bg_extent_count; |
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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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/* |
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* Number of devices under this fsid including missing and |
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* replace-target device and excludes seed devices. |
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*/ |
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u64 num_devices; |
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/* |
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* The number of devices that successfully opened, including |
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* replace-target, excludes seed devices. |
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*/ |
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u64 open_devices; |
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/* The number of devices that are under the chunk allocation list. */ |
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u64 rw_devices; |
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/* Count of missing devices under this fsid excluding seed device. */ |
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u64 missing_devices; |
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u64 total_rw_bytes; |
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/* |
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* Count of devices from btrfs_super_block::num_devices for this fsid, |
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* which includes the seed device, excludes the transient replace-target |
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* device. |
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*/ |
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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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/* |
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* The mount device or a device with highest generation after removal |
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* or replace. |
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*/ |
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struct btrfs_device *latest_dev; |
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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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* Maximum number of sectors for a single bio to limit the size of the |
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* checksum array. This matches the number of bio_vecs per bio and thus the |
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* I/O size for buffered I/O. |
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*/ |
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#define BTRFS_MAX_BIO_SECTORS (256) |
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typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio); |
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/* |
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* Additional info to pass along bio. |
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* |
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* Mostly for btrfs specific features like csum and mirror_num. |
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*/ |
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struct btrfs_bio { |
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unsigned int mirror_num; |
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struct bvec_iter iter; |
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/* for direct I/O */ |
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u64 file_offset; |
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/* @device is for stripe IO submission. */ |
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struct btrfs_device *device; |
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u8 *csum; |
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u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; |
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/* End I/O information supplied to btrfs_bio_alloc */ |
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btrfs_bio_end_io_t end_io; |
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void *private; |
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/* For read end I/O handling */ |
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struct work_struct end_io_work; |
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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_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_bio *btrfs_bio(struct bio *bio) |
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{ |
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return container_of(bio, struct btrfs_bio, bio); |
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} |
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int __init btrfs_bioset_init(void); |
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void __cold btrfs_bioset_exit(void); |
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struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf, |
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btrfs_bio_end_io_t end_io, void *private); |
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struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size, |
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btrfs_bio_end_io_t end_io, void *private); |
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static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status) |
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{ |
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bbio->bio.bi_status = status; |
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bbio->end_io(bbio); |
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} |
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static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) |
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{ |
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if (bbio->csum != bbio->csum_inline) { |
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kfree(bbio->csum); |
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bbio->csum = NULL; |
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} |
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} |
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/* |
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* Iterate through a btrfs_bio (@bbio) on a per-sector basis. |
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* |
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* bvl - struct bio_vec |
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* bbio - struct btrfs_bio |
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* iters - struct bvec_iter |
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* bio_offset - unsigned int |
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*/ |
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#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \ |
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for ((iter) = (bbio)->iter, (bio_offset) = 0; \ |
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(iter).bi_size && \ |
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(((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \ |
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(bio_offset) += fs_info->sectorsize, \ |
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bio_advance_iter_single(&(bbio)->bio, &(iter), \ |
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(fs_info)->sectorsize)) |
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struct btrfs_io_stripe { |
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struct btrfs_device *dev; |
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union { |
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/* Block mapping */ |
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u64 physical; |
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/* For the endio handler */ |
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struct btrfs_io_context *bioc; |
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}; |
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}; |
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struct btrfs_discard_stripe { |
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struct btrfs_device *dev; |
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u64 physical; |
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u64 length; |
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}; |
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/* |
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* Context for IO subsmission for device stripe. |
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* |
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* - Track the unfinished mirrors for mirror based profiles |
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* Mirror based profiles are SINGLE/DUP/RAID1/RAID10. |
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* |
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* - Contain the logical -> physical mapping info |
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* Used by submit_stripe_bio() for mapping logical bio |
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* into physical device address. |
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* |
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* - Contain device replace info |
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* Used by handle_ops_on_dev_replace() to copy logical bios |
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* into the new device. |
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* |
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* - Contain RAID56 full stripe logical bytenrs |
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*/ |
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struct btrfs_io_context { |
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refcount_t refs; |
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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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struct bio *orig_bio; |
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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_io_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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u32 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_io_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_io_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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/* |
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* Search for a given device by the set parameters |
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*/ |
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struct btrfs_dev_lookup_args { |
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u64 devid; |
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u8 *uuid; |
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u8 *fsid; |
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bool missing; |
|
}; |
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|
|
/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */ |
|
#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 } |
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|
|
#define BTRFS_DEV_LOOKUP_ARGS(name) \ |
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struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT |
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|
|
enum btrfs_map_op { |
|
BTRFS_MAP_READ, |
|
BTRFS_MAP_WRITE, |
|
BTRFS_MAP_DISCARD, |
|
BTRFS_MAP_GET_READ_MIRRORS, |
|
}; |
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|
|
static inline enum btrfs_map_op btrfs_op(struct bio *bio) |
|
{ |
|
switch (bio_op(bio)) { |
|
case REQ_OP_DISCARD: |
|
return BTRFS_MAP_DISCARD; |
|
case REQ_OP_WRITE: |
|
case REQ_OP_ZONE_APPEND: |
|
return BTRFS_MAP_WRITE; |
|
default: |
|
WARN_ON_ONCE(1); |
|
fallthrough; |
|
case REQ_OP_READ: |
|
return BTRFS_MAP_READ; |
|
} |
|
} |
|
|
|
void btrfs_get_bioc(struct btrfs_io_context *bioc); |
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void btrfs_put_bioc(struct btrfs_io_context *bioc); |
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int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
|
u64 logical, u64 *length, |
|
struct btrfs_io_context **bioc_ret, int mirror_num); |
|
int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
|
u64 logical, u64 *length, |
|
struct btrfs_io_context **bioc_ret); |
|
struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, |
|
u64 logical, u64 *length_ret, |
|
u32 *num_stripes); |
|
int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map, |
|
enum btrfs_map_op op, u64 logical, |
|
struct btrfs_io_geometry *io_geom); |
|
int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); |
|
int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); |
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struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, |
|
u64 type); |
|
void btrfs_mapping_tree_free(struct extent_map_tree *tree); |
|
void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num); |
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
|
fmode_t flags, void *holder); |
|
struct btrfs_device *btrfs_scan_one_device(const char *path, |
|
fmode_t flags, void *holder); |
|
int btrfs_forget_devices(dev_t devt); |
|
void btrfs_close_devices(struct btrfs_fs_devices *fs_devices); |
|
void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices); |
|
void btrfs_assign_next_active_device(struct btrfs_device *device, |
|
struct btrfs_device *this_dev); |
|
struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, |
|
u64 devid, |
|
const char *devpath); |
|
int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info, |
|
struct btrfs_dev_lookup_args *args, |
|
const char *path); |
|
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, |
|
const u64 *devid, |
|
const u8 *uuid); |
|
void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); |
|
void btrfs_free_device(struct btrfs_device *device); |
|
int btrfs_rm_device(struct btrfs_fs_info *fs_info, |
|
struct btrfs_dev_lookup_args *args, |
|
struct block_device **bdev, fmode_t *mode); |
|
void __exit btrfs_cleanup_fs_uuids(void); |
|
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); |
|
int btrfs_grow_device(struct btrfs_trans_handle *trans, |
|
struct btrfs_device *device, u64 new_size); |
|
struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices, |
|
const struct btrfs_dev_lookup_args *args); |
|
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
|
int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path); |
|
int btrfs_balance(struct btrfs_fs_info *fs_info, |
|
struct btrfs_balance_control *bctl, |
|
struct btrfs_ioctl_balance_args *bargs); |
|
void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf); |
|
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); |
|
int btrfs_recover_balance(struct btrfs_fs_info *fs_info); |
|
int btrfs_pause_balance(struct btrfs_fs_info *fs_info); |
|
int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset); |
|
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); |
|
int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); |
|
int btrfs_uuid_scan_kthread(void *data); |
|
bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset); |
|
int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, |
|
u64 *start, u64 *max_avail); |
|
void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); |
|
int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, |
|
struct btrfs_ioctl_get_dev_stats *stats); |
|
int btrfs_init_devices_late(struct btrfs_fs_info *fs_info); |
|
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); |
|
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans); |
|
void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); |
|
void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev); |
|
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); |
|
int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, |
|
u64 logical, u64 len); |
|
unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, |
|
u64 logical); |
|
u64 btrfs_calc_stripe_length(const struct extent_map *em); |
|
int btrfs_nr_parity_stripes(u64 type); |
|
int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans, |
|
struct btrfs_block_group *bg); |
|
int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); |
|
struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, |
|
u64 logical, u64 length); |
|
void btrfs_release_disk_super(struct btrfs_super_block *super); |
|
|
|
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, |
|
int index) |
|
{ |
|
atomic_inc(dev->dev_stat_values + index); |
|
/* |
|
* 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); |
|
} |
|
|
|
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); |
|
} |
|
|
|
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); |
|
|
|
enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags); |
|
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); |
|
bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); |
|
|
|
bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); |
|
|
|
#endif
|
|
|