mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
d445bd9cec
Commit00a0ea33b4("dm thin: do not queue freed thin mapping for next stage processing") changed process_prepared_discard_passdown_pt1() to increment all the blocks being discarded until after the passdown had completed to avoid them being prematurely reused. IO issued to a thin device that breaks sharing with a snapshot, followed by a discard issued to snapshot(s) that previously shared the block(s), results in passdown_double_checking_shared_status() being called to iterate through the blocks double checking their reference count is zero and issuing the passdown if so. So a side effect of commit00a0ea33b4is passdown_double_checking_shared_status() was broken. Fix this by checking if the block reference count is greater than 1. Also, rename dm_pool_block_is_used() to dm_pool_block_is_shared(). Fixes:00a0ea33b4("dm thin: do not queue freed thin mapping for next stage processing") Cc: stable@vger.kernel.org # 4.9+ Reported-by: ryan.p.norwood@gmail.com Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/*
|
|
* Copyright (C) 2010-2011 Red Hat, Inc.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#ifndef DM_THIN_METADATA_H
|
|
#define DM_THIN_METADATA_H
|
|
|
|
#include "persistent-data/dm-block-manager.h"
|
|
#include "persistent-data/dm-space-map.h"
|
|
#include "persistent-data/dm-space-map-metadata.h"
|
|
|
|
#define THIN_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE
|
|
|
|
/*
|
|
* The metadata device is currently limited in size.
|
|
*/
|
|
#define THIN_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS
|
|
|
|
/*
|
|
* A metadata device larger than 16GB triggers a warning.
|
|
*/
|
|
#define THIN_METADATA_MAX_SECTORS_WARNING (16 * (1024 * 1024 * 1024 >> SECTOR_SHIFT))
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Thin metadata superblock flags.
|
|
*/
|
|
#define THIN_METADATA_NEEDS_CHECK_FLAG (1 << 0)
|
|
|
|
struct dm_pool_metadata;
|
|
struct dm_thin_device;
|
|
|
|
/*
|
|
* Device identifier
|
|
*/
|
|
typedef uint64_t dm_thin_id;
|
|
|
|
/*
|
|
* Reopens or creates a new, empty metadata volume.
|
|
*/
|
|
struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
|
|
sector_t data_block_size,
|
|
bool format_device);
|
|
|
|
int dm_pool_metadata_close(struct dm_pool_metadata *pmd);
|
|
|
|
/*
|
|
* Compat feature flags. Any incompat flags beyond the ones
|
|
* specified below will prevent use of the thin metadata.
|
|
*/
|
|
#define THIN_FEATURE_COMPAT_SUPP 0UL
|
|
#define THIN_FEATURE_COMPAT_RO_SUPP 0UL
|
|
#define THIN_FEATURE_INCOMPAT_SUPP 0UL
|
|
|
|
/*
|
|
* Device creation/deletion.
|
|
*/
|
|
int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev);
|
|
|
|
/*
|
|
* An internal snapshot.
|
|
*
|
|
* You can only snapshot a quiesced origin i.e. one that is either
|
|
* suspended or not instanced at all.
|
|
*/
|
|
int dm_pool_create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev,
|
|
dm_thin_id origin);
|
|
|
|
/*
|
|
* Deletes a virtual device from the metadata. It _is_ safe to call this
|
|
* when that device is open. Operations on that device will just start
|
|
* failing. You still need to call close() on the device.
|
|
*/
|
|
int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev);
|
|
|
|
/*
|
|
* Commits _all_ metadata changes: device creation, deletion, mapping
|
|
* updates.
|
|
*/
|
|
int dm_pool_commit_metadata(struct dm_pool_metadata *pmd);
|
|
|
|
/*
|
|
* Discards all uncommitted changes. Rereads the superblock, rolling back
|
|
* to the last good transaction. Thin devices remain open.
|
|
* dm_thin_aborted_changes() tells you if they had uncommitted changes.
|
|
*
|
|
* If this call fails it's only useful to call dm_pool_metadata_close().
|
|
* All other methods will fail with -EINVAL.
|
|
*/
|
|
int dm_pool_abort_metadata(struct dm_pool_metadata *pmd);
|
|
|
|
/*
|
|
* Set/get userspace transaction id.
|
|
*/
|
|
int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd,
|
|
uint64_t current_id,
|
|
uint64_t new_id);
|
|
|
|
int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
|
|
uint64_t *result);
|
|
|
|
/*
|
|
* Hold/get root for userspace transaction.
|
|
*
|
|
* The metadata snapshot is a copy of the current superblock (minus the
|
|
* space maps). Userland can access the data structures for READ
|
|
* operations only. A small performance hit is incurred by providing this
|
|
* copy of the metadata to userland due to extra copy-on-write operations
|
|
* on the metadata nodes. Release this as soon as you finish with it.
|
|
*/
|
|
int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd);
|
|
int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd);
|
|
|
|
int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result);
|
|
|
|
/*
|
|
* Actions on a single virtual device.
|
|
*/
|
|
|
|
/*
|
|
* Opening the same device more than once will fail with -EBUSY.
|
|
*/
|
|
int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev,
|
|
struct dm_thin_device **td);
|
|
|
|
int dm_pool_close_thin_device(struct dm_thin_device *td);
|
|
|
|
dm_thin_id dm_thin_dev_id(struct dm_thin_device *td);
|
|
|
|
struct dm_thin_lookup_result {
|
|
dm_block_t block;
|
|
bool shared:1;
|
|
};
|
|
|
|
/*
|
|
* Returns:
|
|
* -EWOULDBLOCK iff @can_issue_io is set and would issue IO
|
|
* -ENODATA iff that mapping is not present.
|
|
* 0 success
|
|
*/
|
|
int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
|
|
int can_issue_io, struct dm_thin_lookup_result *result);
|
|
|
|
/*
|
|
* Retrieve the next run of contiguously mapped blocks. Useful for working
|
|
* out where to break up IO. Returns 0 on success, < 0 on error.
|
|
*/
|
|
int dm_thin_find_mapped_range(struct dm_thin_device *td,
|
|
dm_block_t begin, dm_block_t end,
|
|
dm_block_t *thin_begin, dm_block_t *thin_end,
|
|
dm_block_t *pool_begin, bool *maybe_shared);
|
|
|
|
/*
|
|
* Obtain an unused block.
|
|
*/
|
|
int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result);
|
|
|
|
/*
|
|
* Insert or remove block.
|
|
*/
|
|
int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
|
|
dm_block_t data_block);
|
|
|
|
int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);
|
|
int dm_thin_remove_range(struct dm_thin_device *td,
|
|
dm_block_t begin, dm_block_t end);
|
|
|
|
/*
|
|
* Queries.
|
|
*/
|
|
bool dm_thin_changed_this_transaction(struct dm_thin_device *td);
|
|
|
|
bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd);
|
|
|
|
bool dm_thin_aborted_changes(struct dm_thin_device *td);
|
|
|
|
int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
|
|
dm_block_t *highest_mapped);
|
|
|
|
int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result);
|
|
|
|
int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result);
|
|
|
|
int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result);
|
|
|
|
int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result);
|
|
|
|
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result);
|
|
|
|
int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result);
|
|
|
|
int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e);
|
|
int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e);
|
|
|
|
/*
|
|
* Returns -ENOSPC if the new size is too small and already allocated
|
|
* blocks would be lost.
|
|
*/
|
|
int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_size);
|
|
int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_size);
|
|
|
|
/*
|
|
* Flicks the underlying block manager into read only mode, so you know
|
|
* that nothing is changing.
|
|
*/
|
|
void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd);
|
|
void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd);
|
|
|
|
int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
|
|
dm_block_t threshold,
|
|
dm_sm_threshold_fn fn,
|
|
void *context);
|
|
|
|
/*
|
|
* Updates the superblock immediately.
|
|
*/
|
|
int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd);
|
|
bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd);
|
|
|
|
/*
|
|
* Issue any prefetches that may be useful.
|
|
*/
|
|
void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd);
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
#endif
|