ba0621368e
Changes in 4.9.154 net: bridge: Fix ethernet header pointer before check skb forwardable net: Fix usage of pskb_trim_rcsum openvswitch: Avoid OOB read when parsing flow nlattrs vhost: log dirty page correctly net: ipv4: Fix memory leak in network namespace dismantle net_sched: refetch skb protocol for each filter ipfrag: really prevent allocation on netns exit USB: serial: simple: add Motorola Tetra TPG2200 device id USB: serial: pl2303: add new PID to support PL2303TB ASoC: atom: fix a missing check of snd_pcm_lib_malloc_pages ASoC: rt5514-spi: Fix potential NULL pointer dereference ARCv2: lib: memeset: fix doing prefetchw outside of buffer ARC: perf: map generic branches to correct hardware condition s390/early: improve machine detection s390/smp: fix CPU hotplug deadlock with CPU rescan char/mwave: fix potential Spectre v1 vulnerability staging: rtl8188eu: Add device code for D-Link DWA-121 rev B1 tty: Handle problem if line discipline does not have receive_buf uart: Fix crash in uart_write and uart_put_char tty/n_hdlc: fix __might_sleep warning CIFS: Fix possible hang during async MTU reads and writes Input: xpad - add support for SteelSeries Stratus Duo compiler.h: enable builtin overflow checkers and add fallback code Input: uinput - fix undefined behavior in uinput_validate_absinfo() acpi/nfit: Block function zero DSMs acpi/nfit: Fix command-supported detection dm thin: fix passdown_double_checking_shared_status() KVM: x86: Fix single-step debugging x86/selftests/pkeys: Fork() to check for state being preserved x86/kaslr: Fix incorrect i8254 outb() parameters can: dev: __can_get_echo_skb(): fix bogous check for non-existing skb by removing it can: bcm: check timer values before ktime conversion vt: invoke notifier on screen size change perf unwind: Unwind with libdw doesn't take symfs into account perf unwind: Take pgoff into account when reporting elf to libdwfl irqchip/gic-v3-its: Align PCI Multi-MSI allocation on their size s390/smp: Fix calling smp_call_ipl_cpu() from ipl CPU nvmet-rdma: Add unlikely for response allocated check nvmet-rdma: fix null dereference under heavy load f2fs: read page index before freeing btrfs: fix error handling in btrfs_dev_replace_start btrfs: dev-replace: go back to suspended state if target device is missing Linux 4.9.154 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/*
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* Copyright (C) 2010-2011 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_THIN_METADATA_H
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#define DM_THIN_METADATA_H
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#include "persistent-data/dm-block-manager.h"
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#include "persistent-data/dm-space-map.h"
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#include "persistent-data/dm-space-map-metadata.h"
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#define THIN_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE
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/*
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* The metadata device is currently limited in size.
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*/
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#define THIN_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS
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/*
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* A metadata device larger than 16GB triggers a warning.
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*/
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#define THIN_METADATA_MAX_SECTORS_WARNING (16 * (1024 * 1024 * 1024 >> SECTOR_SHIFT))
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/*----------------------------------------------------------------*/
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/*
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* Thin metadata superblock flags.
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*/
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#define THIN_METADATA_NEEDS_CHECK_FLAG (1 << 0)
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struct dm_pool_metadata;
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struct dm_thin_device;
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/*
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* Device identifier
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*/
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typedef uint64_t dm_thin_id;
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/*
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* Reopens or creates a new, empty metadata volume.
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*/
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struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
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sector_t data_block_size,
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bool format_device);
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int dm_pool_metadata_close(struct dm_pool_metadata *pmd);
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/*
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* Compat feature flags. Any incompat flags beyond the ones
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* specified below will prevent use of the thin metadata.
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*/
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#define THIN_FEATURE_COMPAT_SUPP 0UL
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#define THIN_FEATURE_COMPAT_RO_SUPP 0UL
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#define THIN_FEATURE_INCOMPAT_SUPP 0UL
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/*
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* Device creation/deletion.
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*/
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int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev);
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/*
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* An internal snapshot.
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*
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* You can only snapshot a quiesced origin i.e. one that is either
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* suspended or not instanced at all.
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*/
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int dm_pool_create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev,
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dm_thin_id origin);
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/*
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* Deletes a virtual device from the metadata. It _is_ safe to call this
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* when that device is open. Operations on that device will just start
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* failing. You still need to call close() on the device.
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*/
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int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
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dm_thin_id dev);
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/*
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* Commits _all_ metadata changes: device creation, deletion, mapping
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* updates.
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*/
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int dm_pool_commit_metadata(struct dm_pool_metadata *pmd);
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/*
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* Discards all uncommitted changes. Rereads the superblock, rolling back
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* to the last good transaction. Thin devices remain open.
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* dm_thin_aborted_changes() tells you if they had uncommitted changes.
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*
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* If this call fails it's only useful to call dm_pool_metadata_close().
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* All other methods will fail with -EINVAL.
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*/
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int dm_pool_abort_metadata(struct dm_pool_metadata *pmd);
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/*
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* Set/get userspace transaction id.
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*/
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int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd,
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uint64_t current_id,
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uint64_t new_id);
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int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
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uint64_t *result);
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/*
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* Hold/get root for userspace transaction.
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*
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* The metadata snapshot is a copy of the current superblock (minus the
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* space maps). Userland can access the data structures for READ
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* operations only. A small performance hit is incurred by providing this
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* copy of the metadata to userland due to extra copy-on-write operations
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* on the metadata nodes. Release this as soon as you finish with it.
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*/
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int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd);
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int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd);
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int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
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dm_block_t *result);
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/*
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* Actions on a single virtual device.
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*/
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/*
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* Opening the same device more than once will fail with -EBUSY.
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*/
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int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev,
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struct dm_thin_device **td);
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int dm_pool_close_thin_device(struct dm_thin_device *td);
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dm_thin_id dm_thin_dev_id(struct dm_thin_device *td);
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struct dm_thin_lookup_result {
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dm_block_t block;
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bool shared:1;
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};
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/*
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* Returns:
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* -EWOULDBLOCK iff @can_issue_io is set and would issue IO
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* -ENODATA iff that mapping is not present.
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* 0 success
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*/
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int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
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int can_issue_io, struct dm_thin_lookup_result *result);
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/*
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* Retrieve the next run of contiguously mapped blocks. Useful for working
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* out where to break up IO. Returns 0 on success, < 0 on error.
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*/
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int dm_thin_find_mapped_range(struct dm_thin_device *td,
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dm_block_t begin, dm_block_t end,
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dm_block_t *thin_begin, dm_block_t *thin_end,
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dm_block_t *pool_begin, bool *maybe_shared);
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/*
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* Obtain an unused block.
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*/
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int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result);
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/*
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* Insert or remove block.
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*/
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int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
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dm_block_t data_block);
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int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);
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int dm_thin_remove_range(struct dm_thin_device *td,
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dm_block_t begin, dm_block_t end);
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/*
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* Queries.
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*/
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bool dm_thin_changed_this_transaction(struct dm_thin_device *td);
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bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd);
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bool dm_thin_aborted_changes(struct dm_thin_device *td);
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int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
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dm_block_t *highest_mapped);
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int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result);
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int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd,
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dm_block_t *result);
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int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
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dm_block_t *result);
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int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
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dm_block_t *result);
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int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result);
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int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result);
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int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e);
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int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e);
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/*
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* Returns -ENOSPC if the new size is too small and already allocated
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* blocks would be lost.
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*/
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int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_size);
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int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_size);
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/*
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* Flicks the underlying block manager into read only mode, so you know
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* that nothing is changing.
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*/
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void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd);
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void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd);
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int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
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dm_block_t threshold,
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dm_sm_threshold_fn fn,
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void *context);
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/*
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* Updates the superblock immediately.
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*/
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int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd);
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bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd);
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/*
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* Issue any prefetches that may be useful.
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*/
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void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd);
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/*----------------------------------------------------------------*/
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#endif
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