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![Joe Thornber](/assets/img/avatar_default.png)
If a transaction abort has failed then we can no longer use the metadata
device. Typically this happens if the superblock is unreadable.
This fix addresses a crash seen during metadata device failure testing.
Fixes: 8a01a6af75
("dm thin: prefetch missing metadata pages")
Cc: stable@vger.kernel.org # 3.19+
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1988 lines
44 KiB
C
1988 lines
44 KiB
C
/*
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* Copyright (C) 2011-2012 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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#include "dm-thin-metadata.h"
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#include "persistent-data/dm-btree.h"
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#include "persistent-data/dm-space-map.h"
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#include "persistent-data/dm-space-map-disk.h"
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#include "persistent-data/dm-transaction-manager.h"
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#include <linux/list.h>
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#include <linux/device-mapper.h>
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#include <linux/workqueue.h>
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/*--------------------------------------------------------------------------
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* As far as the metadata goes, there is:
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*
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* - A superblock in block zero, taking up fewer than 512 bytes for
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* atomic writes.
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*
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* - A space map managing the metadata blocks.
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*
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* - A space map managing the data blocks.
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*
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* - A btree mapping our internal thin dev ids onto struct disk_device_details.
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*
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* - A hierarchical btree, with 2 levels which effectively maps (thin
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* dev id, virtual block) -> block_time. Block time is a 64-bit
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* field holding the time in the low 24 bits, and block in the top 48
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* bits.
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*
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* BTrees consist solely of btree_nodes, that fill a block. Some are
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* internal nodes, as such their values are a __le64 pointing to other
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* nodes. Leaf nodes can store data of any reasonable size (ie. much
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* smaller than the block size). The nodes consist of the header,
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* followed by an array of keys, followed by an array of values. We have
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* to binary search on the keys so they're all held together to help the
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* cpu cache.
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*
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* Space maps have 2 btrees:
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*
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* - One maps a uint64_t onto a struct index_entry. Which points to a
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* bitmap block, and has some details about how many free entries there
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* are etc.
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*
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* - The bitmap blocks have a header (for the checksum). Then the rest
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* of the block is pairs of bits. With the meaning being:
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*
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* 0 - ref count is 0
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* 1 - ref count is 1
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* 2 - ref count is 2
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* 3 - ref count is higher than 2
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*
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* - If the count is higher than 2 then the ref count is entered in a
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* second btree that directly maps the block_address to a uint32_t ref
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* count.
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*
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* The space map metadata variant doesn't have a bitmaps btree. Instead
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* it has one single blocks worth of index_entries. This avoids
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* recursive issues with the bitmap btree needing to allocate space in
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* order to insert. With a small data block size such as 64k the
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* metadata support data devices that are hundreds of terrabytes.
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*
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* The space maps allocate space linearly from front to back. Space that
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* is freed in a transaction is never recycled within that transaction.
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* To try and avoid fragmenting _free_ space the allocator always goes
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* back and fills in gaps.
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*
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* All metadata io is in THIN_METADATA_BLOCK_SIZE sized/aligned chunks
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* from the block manager.
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*--------------------------------------------------------------------------*/
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#define DM_MSG_PREFIX "thin metadata"
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#define THIN_SUPERBLOCK_MAGIC 27022010
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#define THIN_SUPERBLOCK_LOCATION 0
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#define THIN_VERSION 2
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#define THIN_METADATA_CACHE_SIZE 64
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#define SECTOR_TO_BLOCK_SHIFT 3
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/*
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* 3 for btree insert +
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* 2 for btree lookup used within space map
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*/
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#define THIN_MAX_CONCURRENT_LOCKS 5
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/* This should be plenty */
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#define SPACE_MAP_ROOT_SIZE 128
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/*
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* Little endian on-disk superblock and device details.
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*/
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struct thin_disk_superblock {
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__le32 csum; /* Checksum of superblock except for this field. */
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__le32 flags;
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__le64 blocknr; /* This block number, dm_block_t. */
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__u8 uuid[16];
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__le64 magic;
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__le32 version;
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__le32 time;
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__le64 trans_id;
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/*
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* Root held by userspace transactions.
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*/
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__le64 held_root;
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__u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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/*
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* 2-level btree mapping (dev_id, (dev block, time)) -> data block
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*/
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__le64 data_mapping_root;
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/*
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* Device detail root mapping dev_id -> device_details
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*/
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__le64 device_details_root;
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__le32 data_block_size; /* In 512-byte sectors. */
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__le32 metadata_block_size; /* In 512-byte sectors. */
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__le64 metadata_nr_blocks;
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__le32 compat_flags;
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__le32 compat_ro_flags;
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__le32 incompat_flags;
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} __packed;
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struct disk_device_details {
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__le64 mapped_blocks;
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__le64 transaction_id; /* When created. */
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__le32 creation_time;
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__le32 snapshotted_time;
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} __packed;
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struct dm_pool_metadata {
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struct hlist_node hash;
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struct block_device *bdev;
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struct dm_block_manager *bm;
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struct dm_space_map *metadata_sm;
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struct dm_space_map *data_sm;
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struct dm_transaction_manager *tm;
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struct dm_transaction_manager *nb_tm;
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/*
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* Two-level btree.
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* First level holds thin_dev_t.
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* Second level holds mappings.
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*/
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struct dm_btree_info info;
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/*
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* Non-blocking version of the above.
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*/
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struct dm_btree_info nb_info;
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/*
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* Just the top level for deleting whole devices.
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*/
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struct dm_btree_info tl_info;
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/*
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* Just the bottom level for creating new devices.
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*/
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struct dm_btree_info bl_info;
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/*
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* Describes the device details btree.
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*/
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struct dm_btree_info details_info;
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struct rw_semaphore root_lock;
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uint32_t time;
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dm_block_t root;
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dm_block_t details_root;
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struct list_head thin_devices;
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uint64_t trans_id;
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unsigned long flags;
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sector_t data_block_size;
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/*
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* Set if a transaction has to be aborted but the attempt to roll back
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* to the previous (good) transaction failed. The only pool metadata
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* operation possible in this state is the closing of the device.
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*/
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bool fail_io:1;
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/*
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* Reading the space map roots can fail, so we read it into these
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* buffers before the superblock is locked and updated.
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*/
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__u8 data_space_map_root[SPACE_MAP_ROOT_SIZE];
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__u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE];
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};
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struct dm_thin_device {
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struct list_head list;
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struct dm_pool_metadata *pmd;
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dm_thin_id id;
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int open_count;
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bool changed:1;
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bool aborted_with_changes:1;
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uint64_t mapped_blocks;
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uint64_t transaction_id;
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uint32_t creation_time;
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uint32_t snapshotted_time;
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};
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/*----------------------------------------------------------------
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* superblock validator
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*--------------------------------------------------------------*/
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#define SUPERBLOCK_CSUM_XOR 160774
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static void sb_prepare_for_write(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct thin_disk_superblock *disk_super = dm_block_data(b);
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disk_super->blocknr = cpu_to_le64(dm_block_location(b));
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disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
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block_size - sizeof(__le32),
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SUPERBLOCK_CSUM_XOR));
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}
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static int sb_check(struct dm_block_validator *v,
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struct dm_block *b,
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size_t block_size)
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{
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struct thin_disk_superblock *disk_super = dm_block_data(b);
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__le32 csum_le;
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if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) {
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DMERR("sb_check failed: blocknr %llu: "
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"wanted %llu", le64_to_cpu(disk_super->blocknr),
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(unsigned long long)dm_block_location(b));
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return -ENOTBLK;
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}
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if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) {
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DMERR("sb_check failed: magic %llu: "
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"wanted %llu", le64_to_cpu(disk_super->magic),
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(unsigned long long)THIN_SUPERBLOCK_MAGIC);
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return -EILSEQ;
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}
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csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags,
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block_size - sizeof(__le32),
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SUPERBLOCK_CSUM_XOR));
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if (csum_le != disk_super->csum) {
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DMERR("sb_check failed: csum %u: wanted %u",
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le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum));
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return -EILSEQ;
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}
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return 0;
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}
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static struct dm_block_validator sb_validator = {
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.name = "superblock",
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.prepare_for_write = sb_prepare_for_write,
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.check = sb_check
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};
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/*----------------------------------------------------------------
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* Methods for the btree value types
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*--------------------------------------------------------------*/
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static uint64_t pack_block_time(dm_block_t b, uint32_t t)
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{
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return (b << 24) | t;
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}
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static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t)
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{
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*b = v >> 24;
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*t = v & ((1 << 24) - 1);
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}
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static void data_block_inc(void *context, const void *value_le)
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{
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struct dm_space_map *sm = context;
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__le64 v_le;
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uint64_t b;
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uint32_t t;
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memcpy(&v_le, value_le, sizeof(v_le));
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unpack_block_time(le64_to_cpu(v_le), &b, &t);
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dm_sm_inc_block(sm, b);
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}
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static void data_block_dec(void *context, const void *value_le)
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{
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struct dm_space_map *sm = context;
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__le64 v_le;
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uint64_t b;
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uint32_t t;
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memcpy(&v_le, value_le, sizeof(v_le));
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unpack_block_time(le64_to_cpu(v_le), &b, &t);
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dm_sm_dec_block(sm, b);
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}
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static int data_block_equal(void *context, const void *value1_le, const void *value2_le)
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{
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__le64 v1_le, v2_le;
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uint64_t b1, b2;
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uint32_t t;
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memcpy(&v1_le, value1_le, sizeof(v1_le));
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memcpy(&v2_le, value2_le, sizeof(v2_le));
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unpack_block_time(le64_to_cpu(v1_le), &b1, &t);
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unpack_block_time(le64_to_cpu(v2_le), &b2, &t);
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return b1 == b2;
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}
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static void subtree_inc(void *context, const void *value)
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{
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struct dm_btree_info *info = context;
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__le64 root_le;
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uint64_t root;
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memcpy(&root_le, value, sizeof(root_le));
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root = le64_to_cpu(root_le);
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dm_tm_inc(info->tm, root);
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}
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static void subtree_dec(void *context, const void *value)
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{
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struct dm_btree_info *info = context;
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__le64 root_le;
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uint64_t root;
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memcpy(&root_le, value, sizeof(root_le));
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root = le64_to_cpu(root_le);
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if (dm_btree_del(info, root))
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DMERR("btree delete failed");
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}
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static int subtree_equal(void *context, const void *value1_le, const void *value2_le)
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{
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__le64 v1_le, v2_le;
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memcpy(&v1_le, value1_le, sizeof(v1_le));
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memcpy(&v2_le, value2_le, sizeof(v2_le));
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return v1_le == v2_le;
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}
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/*----------------------------------------------------------------*/
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static int superblock_lock_zero(struct dm_pool_metadata *pmd,
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struct dm_block **sblock)
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{
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return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION,
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&sb_validator, sblock);
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}
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static int superblock_lock(struct dm_pool_metadata *pmd,
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struct dm_block **sblock)
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{
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return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
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&sb_validator, sblock);
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}
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static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result)
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{
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int r;
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unsigned i;
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struct dm_block *b;
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__le64 *data_le, zero = cpu_to_le64(0);
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unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64);
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/*
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* We can't use a validator here - it may be all zeroes.
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*/
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r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b);
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if (r)
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return r;
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data_le = dm_block_data(b);
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*result = 1;
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for (i = 0; i < block_size; i++) {
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if (data_le[i] != zero) {
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*result = 0;
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break;
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}
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}
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dm_bm_unlock(b);
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return 0;
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}
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static void __setup_btree_details(struct dm_pool_metadata *pmd)
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{
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pmd->info.tm = pmd->tm;
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pmd->info.levels = 2;
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pmd->info.value_type.context = pmd->data_sm;
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pmd->info.value_type.size = sizeof(__le64);
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pmd->info.value_type.inc = data_block_inc;
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pmd->info.value_type.dec = data_block_dec;
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pmd->info.value_type.equal = data_block_equal;
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memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info));
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pmd->nb_info.tm = pmd->nb_tm;
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pmd->tl_info.tm = pmd->tm;
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pmd->tl_info.levels = 1;
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pmd->tl_info.value_type.context = &pmd->bl_info;
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pmd->tl_info.value_type.size = sizeof(__le64);
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pmd->tl_info.value_type.inc = subtree_inc;
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pmd->tl_info.value_type.dec = subtree_dec;
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pmd->tl_info.value_type.equal = subtree_equal;
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pmd->bl_info.tm = pmd->tm;
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pmd->bl_info.levels = 1;
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pmd->bl_info.value_type.context = pmd->data_sm;
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pmd->bl_info.value_type.size = sizeof(__le64);
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pmd->bl_info.value_type.inc = data_block_inc;
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pmd->bl_info.value_type.dec = data_block_dec;
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pmd->bl_info.value_type.equal = data_block_equal;
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pmd->details_info.tm = pmd->tm;
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pmd->details_info.levels = 1;
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pmd->details_info.value_type.context = NULL;
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pmd->details_info.value_type.size = sizeof(struct disk_device_details);
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pmd->details_info.value_type.inc = NULL;
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pmd->details_info.value_type.dec = NULL;
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pmd->details_info.value_type.equal = NULL;
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}
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static int save_sm_roots(struct dm_pool_metadata *pmd)
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{
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int r;
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size_t len;
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r = dm_sm_root_size(pmd->metadata_sm, &len);
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if (r < 0)
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return r;
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r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len);
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if (r < 0)
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return r;
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r = dm_sm_root_size(pmd->data_sm, &len);
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if (r < 0)
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return r;
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return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len);
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}
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static void copy_sm_roots(struct dm_pool_metadata *pmd,
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struct thin_disk_superblock *disk)
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{
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memcpy(&disk->metadata_space_map_root,
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&pmd->metadata_space_map_root,
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sizeof(pmd->metadata_space_map_root));
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memcpy(&disk->data_space_map_root,
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&pmd->data_space_map_root,
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sizeof(pmd->data_space_map_root));
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}
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static int __write_initial_superblock(struct dm_pool_metadata *pmd)
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{
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int r;
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struct dm_block *sblock;
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struct thin_disk_superblock *disk_super;
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sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT;
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if (bdev_size > THIN_METADATA_MAX_SECTORS)
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bdev_size = THIN_METADATA_MAX_SECTORS;
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r = dm_sm_commit(pmd->data_sm);
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if (r < 0)
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return r;
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r = save_sm_roots(pmd);
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if (r < 0)
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return r;
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r = dm_tm_pre_commit(pmd->tm);
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if (r < 0)
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return r;
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r = superblock_lock_zero(pmd, &sblock);
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if (r)
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return r;
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|
|
disk_super = dm_block_data(sblock);
|
|
disk_super->flags = 0;
|
|
memset(disk_super->uuid, 0, sizeof(disk_super->uuid));
|
|
disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
|
|
disk_super->version = cpu_to_le32(THIN_VERSION);
|
|
disk_super->time = 0;
|
|
disk_super->trans_id = 0;
|
|
disk_super->held_root = 0;
|
|
|
|
copy_sm_roots(pmd, disk_super);
|
|
|
|
disk_super->data_mapping_root = cpu_to_le64(pmd->root);
|
|
disk_super->device_details_root = cpu_to_le64(pmd->details_root);
|
|
disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE);
|
|
disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);
|
|
disk_super->data_block_size = cpu_to_le32(pmd->data_block_size);
|
|
|
|
return dm_tm_commit(pmd->tm, sblock);
|
|
}
|
|
|
|
static int __format_metadata(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
|
|
r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
|
|
&pmd->tm, &pmd->metadata_sm);
|
|
if (r < 0) {
|
|
DMERR("tm_create_with_sm failed");
|
|
return r;
|
|
}
|
|
|
|
pmd->data_sm = dm_sm_disk_create(pmd->tm, 0);
|
|
if (IS_ERR(pmd->data_sm)) {
|
|
DMERR("sm_disk_create failed");
|
|
r = PTR_ERR(pmd->data_sm);
|
|
goto bad_cleanup_tm;
|
|
}
|
|
|
|
pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
|
|
if (!pmd->nb_tm) {
|
|
DMERR("could not create non-blocking clone tm");
|
|
r = -ENOMEM;
|
|
goto bad_cleanup_data_sm;
|
|
}
|
|
|
|
__setup_btree_details(pmd);
|
|
|
|
r = dm_btree_empty(&pmd->info, &pmd->root);
|
|
if (r < 0)
|
|
goto bad_cleanup_nb_tm;
|
|
|
|
r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
|
|
if (r < 0) {
|
|
DMERR("couldn't create devices root");
|
|
goto bad_cleanup_nb_tm;
|
|
}
|
|
|
|
r = __write_initial_superblock(pmd);
|
|
if (r)
|
|
goto bad_cleanup_nb_tm;
|
|
|
|
return 0;
|
|
|
|
bad_cleanup_nb_tm:
|
|
dm_tm_destroy(pmd->nb_tm);
|
|
bad_cleanup_data_sm:
|
|
dm_sm_destroy(pmd->data_sm);
|
|
bad_cleanup_tm:
|
|
dm_tm_destroy(pmd->tm);
|
|
dm_sm_destroy(pmd->metadata_sm);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __check_incompat_features(struct thin_disk_superblock *disk_super,
|
|
struct dm_pool_metadata *pmd)
|
|
{
|
|
uint32_t features;
|
|
|
|
features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP;
|
|
if (features) {
|
|
DMERR("could not access metadata due to unsupported optional features (%lx).",
|
|
(unsigned long)features);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check for read-only metadata to skip the following RDWR checks.
|
|
*/
|
|
if (get_disk_ro(pmd->bdev->bd_disk))
|
|
return 0;
|
|
|
|
features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP;
|
|
if (features) {
|
|
DMERR("could not access metadata RDWR due to unsupported optional features (%lx).",
|
|
(unsigned long)features);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __open_metadata(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
struct dm_block *sblock;
|
|
struct thin_disk_superblock *disk_super;
|
|
|
|
r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
|
|
&sb_validator, &sblock);
|
|
if (r < 0) {
|
|
DMERR("couldn't read superblock");
|
|
return r;
|
|
}
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
|
|
/* Verify the data block size hasn't changed */
|
|
if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) {
|
|
DMERR("changing the data block size (from %u to %llu) is not supported",
|
|
le32_to_cpu(disk_super->data_block_size),
|
|
(unsigned long long)pmd->data_block_size);
|
|
r = -EINVAL;
|
|
goto bad_unlock_sblock;
|
|
}
|
|
|
|
r = __check_incompat_features(disk_super, pmd);
|
|
if (r < 0)
|
|
goto bad_unlock_sblock;
|
|
|
|
r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION,
|
|
disk_super->metadata_space_map_root,
|
|
sizeof(disk_super->metadata_space_map_root),
|
|
&pmd->tm, &pmd->metadata_sm);
|
|
if (r < 0) {
|
|
DMERR("tm_open_with_sm failed");
|
|
goto bad_unlock_sblock;
|
|
}
|
|
|
|
pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root,
|
|
sizeof(disk_super->data_space_map_root));
|
|
if (IS_ERR(pmd->data_sm)) {
|
|
DMERR("sm_disk_open failed");
|
|
r = PTR_ERR(pmd->data_sm);
|
|
goto bad_cleanup_tm;
|
|
}
|
|
|
|
pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
|
|
if (!pmd->nb_tm) {
|
|
DMERR("could not create non-blocking clone tm");
|
|
r = -ENOMEM;
|
|
goto bad_cleanup_data_sm;
|
|
}
|
|
|
|
__setup_btree_details(pmd);
|
|
dm_bm_unlock(sblock);
|
|
|
|
return 0;
|
|
|
|
bad_cleanup_data_sm:
|
|
dm_sm_destroy(pmd->data_sm);
|
|
bad_cleanup_tm:
|
|
dm_tm_destroy(pmd->tm);
|
|
dm_sm_destroy(pmd->metadata_sm);
|
|
bad_unlock_sblock:
|
|
dm_bm_unlock(sblock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device)
|
|
{
|
|
int r, unformatted;
|
|
|
|
r = __superblock_all_zeroes(pmd->bm, &unformatted);
|
|
if (r)
|
|
return r;
|
|
|
|
if (unformatted)
|
|
return format_device ? __format_metadata(pmd) : -EPERM;
|
|
|
|
return __open_metadata(pmd);
|
|
}
|
|
|
|
static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device)
|
|
{
|
|
int r;
|
|
|
|
pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
|
|
THIN_METADATA_CACHE_SIZE,
|
|
THIN_MAX_CONCURRENT_LOCKS);
|
|
if (IS_ERR(pmd->bm)) {
|
|
DMERR("could not create block manager");
|
|
return PTR_ERR(pmd->bm);
|
|
}
|
|
|
|
r = __open_or_format_metadata(pmd, format_device);
|
|
if (r)
|
|
dm_block_manager_destroy(pmd->bm);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd)
|
|
{
|
|
dm_sm_destroy(pmd->data_sm);
|
|
dm_sm_destroy(pmd->metadata_sm);
|
|
dm_tm_destroy(pmd->nb_tm);
|
|
dm_tm_destroy(pmd->tm);
|
|
dm_block_manager_destroy(pmd->bm);
|
|
}
|
|
|
|
static int __begin_transaction(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
struct thin_disk_superblock *disk_super;
|
|
struct dm_block *sblock;
|
|
|
|
/*
|
|
* We re-read the superblock every time. Shouldn't need to do this
|
|
* really.
|
|
*/
|
|
r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
|
|
&sb_validator, &sblock);
|
|
if (r)
|
|
return r;
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
pmd->time = le32_to_cpu(disk_super->time);
|
|
pmd->root = le64_to_cpu(disk_super->data_mapping_root);
|
|
pmd->details_root = le64_to_cpu(disk_super->device_details_root);
|
|
pmd->trans_id = le64_to_cpu(disk_super->trans_id);
|
|
pmd->flags = le32_to_cpu(disk_super->flags);
|
|
pmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
|
|
|
|
dm_bm_unlock(sblock);
|
|
return 0;
|
|
}
|
|
|
|
static int __write_changed_details(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
struct dm_thin_device *td, *tmp;
|
|
struct disk_device_details details;
|
|
uint64_t key;
|
|
|
|
list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
|
|
if (!td->changed)
|
|
continue;
|
|
|
|
key = td->id;
|
|
|
|
details.mapped_blocks = cpu_to_le64(td->mapped_blocks);
|
|
details.transaction_id = cpu_to_le64(td->transaction_id);
|
|
details.creation_time = cpu_to_le32(td->creation_time);
|
|
details.snapshotted_time = cpu_to_le32(td->snapshotted_time);
|
|
__dm_bless_for_disk(&details);
|
|
|
|
r = dm_btree_insert(&pmd->details_info, pmd->details_root,
|
|
&key, &details, &pmd->details_root);
|
|
if (r)
|
|
return r;
|
|
|
|
if (td->open_count)
|
|
td->changed = 0;
|
|
else {
|
|
list_del(&td->list);
|
|
kfree(td);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __commit_transaction(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
size_t metadata_len, data_len;
|
|
struct thin_disk_superblock *disk_super;
|
|
struct dm_block *sblock;
|
|
|
|
/*
|
|
* We need to know if the thin_disk_superblock exceeds a 512-byte sector.
|
|
*/
|
|
BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512);
|
|
|
|
r = __write_changed_details(pmd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_sm_commit(pmd->data_sm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_tm_pre_commit(pmd->tm);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_sm_root_size(pmd->metadata_sm, &metadata_len);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = dm_sm_root_size(pmd->data_sm, &data_len);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = save_sm_roots(pmd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = superblock_lock(pmd, &sblock);
|
|
if (r)
|
|
return r;
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
disk_super->time = cpu_to_le32(pmd->time);
|
|
disk_super->data_mapping_root = cpu_to_le64(pmd->root);
|
|
disk_super->device_details_root = cpu_to_le64(pmd->details_root);
|
|
disk_super->trans_id = cpu_to_le64(pmd->trans_id);
|
|
disk_super->flags = cpu_to_le32(pmd->flags);
|
|
|
|
copy_sm_roots(pmd, disk_super);
|
|
|
|
return dm_tm_commit(pmd->tm, sblock);
|
|
}
|
|
|
|
struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
|
|
sector_t data_block_size,
|
|
bool format_device)
|
|
{
|
|
int r;
|
|
struct dm_pool_metadata *pmd;
|
|
|
|
pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);
|
|
if (!pmd) {
|
|
DMERR("could not allocate metadata struct");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
init_rwsem(&pmd->root_lock);
|
|
pmd->time = 0;
|
|
INIT_LIST_HEAD(&pmd->thin_devices);
|
|
pmd->fail_io = false;
|
|
pmd->bdev = bdev;
|
|
pmd->data_block_size = data_block_size;
|
|
|
|
r = __create_persistent_data_objects(pmd, format_device);
|
|
if (r) {
|
|
kfree(pmd);
|
|
return ERR_PTR(r);
|
|
}
|
|
|
|
r = __begin_transaction(pmd);
|
|
if (r < 0) {
|
|
if (dm_pool_metadata_close(pmd) < 0)
|
|
DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
|
|
return ERR_PTR(r);
|
|
}
|
|
|
|
return pmd;
|
|
}
|
|
|
|
int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
unsigned open_devices = 0;
|
|
struct dm_thin_device *td, *tmp;
|
|
|
|
down_read(&pmd->root_lock);
|
|
list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
|
|
if (td->open_count)
|
|
open_devices++;
|
|
else {
|
|
list_del(&td->list);
|
|
kfree(td);
|
|
}
|
|
}
|
|
up_read(&pmd->root_lock);
|
|
|
|
if (open_devices) {
|
|
DMERR("attempt to close pmd when %u device(s) are still open",
|
|
open_devices);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) {
|
|
r = __commit_transaction(pmd);
|
|
if (r < 0)
|
|
DMWARN("%s: __commit_transaction() failed, error = %d",
|
|
__func__, r);
|
|
}
|
|
|
|
if (!pmd->fail_io)
|
|
__destroy_persistent_data_objects(pmd);
|
|
|
|
kfree(pmd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* __open_device: Returns @td corresponding to device with id @dev,
|
|
* creating it if @create is set and incrementing @td->open_count.
|
|
* On failure, @td is undefined.
|
|
*/
|
|
static int __open_device(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev, int create,
|
|
struct dm_thin_device **td)
|
|
{
|
|
int r, changed = 0;
|
|
struct dm_thin_device *td2;
|
|
uint64_t key = dev;
|
|
struct disk_device_details details_le;
|
|
|
|
/*
|
|
* If the device is already open, return it.
|
|
*/
|
|
list_for_each_entry(td2, &pmd->thin_devices, list)
|
|
if (td2->id == dev) {
|
|
/*
|
|
* May not create an already-open device.
|
|
*/
|
|
if (create)
|
|
return -EEXIST;
|
|
|
|
td2->open_count++;
|
|
*td = td2;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check the device exists.
|
|
*/
|
|
r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
|
|
&key, &details_le);
|
|
if (r) {
|
|
if (r != -ENODATA || !create)
|
|
return r;
|
|
|
|
/*
|
|
* Create new device.
|
|
*/
|
|
changed = 1;
|
|
details_le.mapped_blocks = 0;
|
|
details_le.transaction_id = cpu_to_le64(pmd->trans_id);
|
|
details_le.creation_time = cpu_to_le32(pmd->time);
|
|
details_le.snapshotted_time = cpu_to_le32(pmd->time);
|
|
}
|
|
|
|
*td = kmalloc(sizeof(**td), GFP_NOIO);
|
|
if (!*td)
|
|
return -ENOMEM;
|
|
|
|
(*td)->pmd = pmd;
|
|
(*td)->id = dev;
|
|
(*td)->open_count = 1;
|
|
(*td)->changed = changed;
|
|
(*td)->aborted_with_changes = false;
|
|
(*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks);
|
|
(*td)->transaction_id = le64_to_cpu(details_le.transaction_id);
|
|
(*td)->creation_time = le32_to_cpu(details_le.creation_time);
|
|
(*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time);
|
|
|
|
list_add(&(*td)->list, &pmd->thin_devices);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __close_device(struct dm_thin_device *td)
|
|
{
|
|
--td->open_count;
|
|
}
|
|
|
|
static int __create_thin(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev)
|
|
{
|
|
int r;
|
|
dm_block_t dev_root;
|
|
uint64_t key = dev;
|
|
struct disk_device_details details_le;
|
|
struct dm_thin_device *td;
|
|
__le64 value;
|
|
|
|
r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
|
|
&key, &details_le);
|
|
if (!r)
|
|
return -EEXIST;
|
|
|
|
/*
|
|
* Create an empty btree for the mappings.
|
|
*/
|
|
r = dm_btree_empty(&pmd->bl_info, &dev_root);
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* Insert it into the main mapping tree.
|
|
*/
|
|
value = cpu_to_le64(dev_root);
|
|
__dm_bless_for_disk(&value);
|
|
r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
|
|
if (r) {
|
|
dm_btree_del(&pmd->bl_info, dev_root);
|
|
return r;
|
|
}
|
|
|
|
r = __open_device(pmd, dev, 1, &td);
|
|
if (r) {
|
|
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
|
|
dm_btree_del(&pmd->bl_info, dev_root);
|
|
return r;
|
|
}
|
|
__close_device(td);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __create_thin(pmd, dev);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __set_snapshot_details(struct dm_pool_metadata *pmd,
|
|
struct dm_thin_device *snap,
|
|
dm_thin_id origin, uint32_t time)
|
|
{
|
|
int r;
|
|
struct dm_thin_device *td;
|
|
|
|
r = __open_device(pmd, origin, 0, &td);
|
|
if (r)
|
|
return r;
|
|
|
|
td->changed = 1;
|
|
td->snapshotted_time = time;
|
|
|
|
snap->mapped_blocks = td->mapped_blocks;
|
|
snap->snapshotted_time = time;
|
|
__close_device(td);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __create_snap(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev, dm_thin_id origin)
|
|
{
|
|
int r;
|
|
dm_block_t origin_root;
|
|
uint64_t key = origin, dev_key = dev;
|
|
struct dm_thin_device *td;
|
|
struct disk_device_details details_le;
|
|
__le64 value;
|
|
|
|
/* check this device is unused */
|
|
r = dm_btree_lookup(&pmd->details_info, pmd->details_root,
|
|
&dev_key, &details_le);
|
|
if (!r)
|
|
return -EEXIST;
|
|
|
|
/* find the mapping tree for the origin */
|
|
r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value);
|
|
if (r)
|
|
return r;
|
|
origin_root = le64_to_cpu(value);
|
|
|
|
/* clone the origin, an inc will do */
|
|
dm_tm_inc(pmd->tm, origin_root);
|
|
|
|
/* insert into the main mapping tree */
|
|
value = cpu_to_le64(origin_root);
|
|
__dm_bless_for_disk(&value);
|
|
key = dev;
|
|
r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root);
|
|
if (r) {
|
|
dm_tm_dec(pmd->tm, origin_root);
|
|
return r;
|
|
}
|
|
|
|
pmd->time++;
|
|
|
|
r = __open_device(pmd, dev, 1, &td);
|
|
if (r)
|
|
goto bad;
|
|
|
|
r = __set_snapshot_details(pmd, td, origin, pmd->time);
|
|
__close_device(td);
|
|
|
|
if (r)
|
|
goto bad;
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
|
|
dm_btree_remove(&pmd->details_info, pmd->details_root,
|
|
&key, &pmd->details_root);
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_create_snap(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev,
|
|
dm_thin_id origin)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __create_snap(pmd, dev, origin);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev)
|
|
{
|
|
int r;
|
|
uint64_t key = dev;
|
|
struct dm_thin_device *td;
|
|
|
|
/* TODO: failure should mark the transaction invalid */
|
|
r = __open_device(pmd, dev, 0, &td);
|
|
if (r)
|
|
return r;
|
|
|
|
if (td->open_count > 1) {
|
|
__close_device(td);
|
|
return -EBUSY;
|
|
}
|
|
|
|
list_del(&td->list);
|
|
kfree(td);
|
|
r = dm_btree_remove(&pmd->details_info, pmd->details_root,
|
|
&key, &pmd->details_root);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
|
|
dm_thin_id dev)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __delete_device(pmd, dev);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd,
|
|
uint64_t current_id,
|
|
uint64_t new_id)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
|
|
if (pmd->fail_io)
|
|
goto out;
|
|
|
|
if (pmd->trans_id != current_id) {
|
|
DMERR("mismatched transaction id");
|
|
goto out;
|
|
}
|
|
|
|
pmd->trans_id = new_id;
|
|
r = 0;
|
|
|
|
out:
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
|
|
uint64_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io) {
|
|
*result = pmd->trans_id;
|
|
r = 0;
|
|
}
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __reserve_metadata_snap(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r, inc;
|
|
struct thin_disk_superblock *disk_super;
|
|
struct dm_block *copy, *sblock;
|
|
dm_block_t held_root;
|
|
|
|
/*
|
|
* We commit to ensure the btree roots which we increment in a
|
|
* moment are up to date.
|
|
*/
|
|
__commit_transaction(pmd);
|
|
|
|
/*
|
|
* Copy the superblock.
|
|
*/
|
|
dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION);
|
|
r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION,
|
|
&sb_validator, ©, &inc);
|
|
if (r)
|
|
return r;
|
|
|
|
BUG_ON(!inc);
|
|
|
|
held_root = dm_block_location(copy);
|
|
disk_super = dm_block_data(copy);
|
|
|
|
if (le64_to_cpu(disk_super->held_root)) {
|
|
DMWARN("Pool metadata snapshot already exists: release this before taking another.");
|
|
|
|
dm_tm_dec(pmd->tm, held_root);
|
|
dm_tm_unlock(pmd->tm, copy);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/*
|
|
* Wipe the spacemap since we're not publishing this.
|
|
*/
|
|
memset(&disk_super->data_space_map_root, 0,
|
|
sizeof(disk_super->data_space_map_root));
|
|
memset(&disk_super->metadata_space_map_root, 0,
|
|
sizeof(disk_super->metadata_space_map_root));
|
|
|
|
/*
|
|
* Increment the data structures that need to be preserved.
|
|
*/
|
|
dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root));
|
|
dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root));
|
|
dm_tm_unlock(pmd->tm, copy);
|
|
|
|
/*
|
|
* Write the held root into the superblock.
|
|
*/
|
|
r = superblock_lock(pmd, &sblock);
|
|
if (r) {
|
|
dm_tm_dec(pmd->tm, held_root);
|
|
return r;
|
|
}
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
disk_super->held_root = cpu_to_le64(held_root);
|
|
dm_bm_unlock(sblock);
|
|
return 0;
|
|
}
|
|
|
|
int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __reserve_metadata_snap(pmd);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __release_metadata_snap(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
struct thin_disk_superblock *disk_super;
|
|
struct dm_block *sblock, *copy;
|
|
dm_block_t held_root;
|
|
|
|
r = superblock_lock(pmd, &sblock);
|
|
if (r)
|
|
return r;
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
held_root = le64_to_cpu(disk_super->held_root);
|
|
disk_super->held_root = cpu_to_le64(0);
|
|
|
|
dm_bm_unlock(sblock);
|
|
|
|
if (!held_root) {
|
|
DMWARN("No pool metadata snapshot found: nothing to release.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©);
|
|
if (r)
|
|
return r;
|
|
|
|
disk_super = dm_block_data(copy);
|
|
dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root));
|
|
dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root));
|
|
dm_sm_dec_block(pmd->metadata_sm, held_root);
|
|
|
|
dm_tm_unlock(pmd->tm, copy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __release_metadata_snap(pmd);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __get_metadata_snap(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result)
|
|
{
|
|
int r;
|
|
struct thin_disk_superblock *disk_super;
|
|
struct dm_block *sblock;
|
|
|
|
r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION,
|
|
&sb_validator, &sblock);
|
|
if (r)
|
|
return r;
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
*result = le64_to_cpu(disk_super->held_root);
|
|
|
|
dm_bm_unlock(sblock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __get_metadata_snap(pmd, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev,
|
|
struct dm_thin_device **td)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __open_device(pmd, dev, 0, td);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_close_thin_device(struct dm_thin_device *td)
|
|
{
|
|
down_write(&td->pmd->root_lock);
|
|
__close_device(td);
|
|
up_write(&td->pmd->root_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
dm_thin_id dm_thin_dev_id(struct dm_thin_device *td)
|
|
{
|
|
return td->id;
|
|
}
|
|
|
|
/*
|
|
* Check whether @time (of block creation) is older than @td's last snapshot.
|
|
* If so then the associated block is shared with the last snapshot device.
|
|
* Any block on a device created *after* the device last got snapshotted is
|
|
* necessarily not shared.
|
|
*/
|
|
static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time)
|
|
{
|
|
return td->snapshotted_time > time;
|
|
}
|
|
|
|
static void unpack_lookup_result(struct dm_thin_device *td, __le64 value,
|
|
struct dm_thin_lookup_result *result)
|
|
{
|
|
uint64_t block_time = 0;
|
|
dm_block_t exception_block;
|
|
uint32_t exception_time;
|
|
|
|
block_time = le64_to_cpu(value);
|
|
unpack_block_time(block_time, &exception_block, &exception_time);
|
|
result->block = exception_block;
|
|
result->shared = __snapshotted_since(td, exception_time);
|
|
}
|
|
|
|
static int __find_block(struct dm_thin_device *td, dm_block_t block,
|
|
int can_issue_io, struct dm_thin_lookup_result *result)
|
|
{
|
|
int r;
|
|
__le64 value;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
dm_block_t keys[2] = { td->id, block };
|
|
struct dm_btree_info *info;
|
|
|
|
if (can_issue_io) {
|
|
info = &pmd->info;
|
|
} else
|
|
info = &pmd->nb_info;
|
|
|
|
r = dm_btree_lookup(info, pmd->root, keys, &value);
|
|
if (!r)
|
|
unpack_lookup_result(td, value, result);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
|
|
int can_issue_io, struct dm_thin_lookup_result *result)
|
|
{
|
|
int r;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (pmd->fail_io) {
|
|
up_read(&pmd->root_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = __find_block(td, block, can_issue_io, result);
|
|
|
|
up_read(&pmd->root_lock);
|
|
return r;
|
|
}
|
|
|
|
static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block,
|
|
dm_block_t *vblock,
|
|
struct dm_thin_lookup_result *result)
|
|
{
|
|
int r;
|
|
__le64 value;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
dm_block_t keys[2] = { td->id, block };
|
|
|
|
r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value);
|
|
if (!r)
|
|
unpack_lookup_result(td, value, result);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __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)
|
|
{
|
|
int r;
|
|
dm_block_t pool_end;
|
|
struct dm_thin_lookup_result lookup;
|
|
|
|
if (end < begin)
|
|
return -ENODATA;
|
|
|
|
r = __find_next_mapped_block(td, begin, &begin, &lookup);
|
|
if (r)
|
|
return r;
|
|
|
|
if (begin >= end)
|
|
return -ENODATA;
|
|
|
|
*thin_begin = begin;
|
|
*pool_begin = lookup.block;
|
|
*maybe_shared = lookup.shared;
|
|
|
|
begin++;
|
|
pool_end = *pool_begin + 1;
|
|
while (begin != end) {
|
|
r = __find_block(td, begin, true, &lookup);
|
|
if (r) {
|
|
if (r == -ENODATA)
|
|
break;
|
|
else
|
|
return r;
|
|
}
|
|
|
|
if ((lookup.block != pool_end) ||
|
|
(lookup.shared != *maybe_shared))
|
|
break;
|
|
|
|
pool_end++;
|
|
begin++;
|
|
}
|
|
|
|
*thin_end = begin;
|
|
return 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
int r = -EINVAL;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io) {
|
|
r = __find_mapped_range(td, begin, end, thin_begin, thin_end,
|
|
pool_begin, maybe_shared);
|
|
}
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __insert(struct dm_thin_device *td, dm_block_t block,
|
|
dm_block_t data_block)
|
|
{
|
|
int r, inserted;
|
|
__le64 value;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
dm_block_t keys[2] = { td->id, block };
|
|
|
|
value = cpu_to_le64(pack_block_time(data_block, pmd->time));
|
|
__dm_bless_for_disk(&value);
|
|
|
|
r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value,
|
|
&pmd->root, &inserted);
|
|
if (r)
|
|
return r;
|
|
|
|
td->changed = 1;
|
|
if (inserted)
|
|
td->mapped_blocks++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
|
|
dm_block_t data_block)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&td->pmd->root_lock);
|
|
if (!td->pmd->fail_io)
|
|
r = __insert(td, block, data_block);
|
|
up_write(&td->pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __remove(struct dm_thin_device *td, dm_block_t block)
|
|
{
|
|
int r;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
dm_block_t keys[2] = { td->id, block };
|
|
|
|
r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root);
|
|
if (r)
|
|
return r;
|
|
|
|
td->mapped_blocks--;
|
|
td->changed = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end)
|
|
{
|
|
int r;
|
|
unsigned count, total_count = 0;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
dm_block_t keys[1] = { td->id };
|
|
__le64 value;
|
|
dm_block_t mapping_root;
|
|
|
|
/*
|
|
* Find the mapping tree
|
|
*/
|
|
r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value);
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* Remove from the mapping tree, taking care to inc the
|
|
* ref count so it doesn't get deleted.
|
|
*/
|
|
mapping_root = le64_to_cpu(value);
|
|
dm_tm_inc(pmd->tm, mapping_root);
|
|
r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root);
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* Remove leaves stops at the first unmapped entry, so we have to
|
|
* loop round finding mapped ranges.
|
|
*/
|
|
while (begin < end) {
|
|
r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value);
|
|
if (r == -ENODATA)
|
|
break;
|
|
|
|
if (r)
|
|
return r;
|
|
|
|
if (begin >= end)
|
|
break;
|
|
|
|
r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count);
|
|
if (r)
|
|
return r;
|
|
|
|
total_count += count;
|
|
}
|
|
|
|
td->mapped_blocks -= total_count;
|
|
td->changed = 1;
|
|
|
|
/*
|
|
* Reinsert the mapping tree.
|
|
*/
|
|
value = cpu_to_le64(mapping_root);
|
|
__dm_bless_for_disk(&value);
|
|
return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root);
|
|
}
|
|
|
|
int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&td->pmd->root_lock);
|
|
if (!td->pmd->fail_io)
|
|
r = __remove(td, block);
|
|
up_write(&td->pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_thin_remove_range(struct dm_thin_device *td,
|
|
dm_block_t begin, dm_block_t end)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&td->pmd->root_lock);
|
|
if (!td->pmd->fail_io)
|
|
r = __remove_range(td, begin, end);
|
|
up_write(&td->pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result)
|
|
{
|
|
int r;
|
|
uint32_t ref_count;
|
|
|
|
down_read(&pmd->root_lock);
|
|
r = dm_sm_get_count(pmd->data_sm, b, &ref_count);
|
|
if (!r)
|
|
*result = (ref_count != 0);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
bool dm_thin_changed_this_transaction(struct dm_thin_device *td)
|
|
{
|
|
int r;
|
|
|
|
down_read(&td->pmd->root_lock);
|
|
r = td->changed;
|
|
up_read(&td->pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd)
|
|
{
|
|
bool r = false;
|
|
struct dm_thin_device *td, *tmp;
|
|
|
|
down_read(&pmd->root_lock);
|
|
list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) {
|
|
if (td->changed) {
|
|
r = td->changed;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
bool dm_thin_aborted_changes(struct dm_thin_device *td)
|
|
{
|
|
bool r;
|
|
|
|
down_read(&td->pmd->root_lock);
|
|
r = td->aborted_with_changes;
|
|
up_read(&td->pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = dm_sm_new_block(pmd->data_sm, result);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_commit_metadata(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (pmd->fail_io)
|
|
goto out;
|
|
|
|
r = __commit_transaction(pmd);
|
|
if (r <= 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Open the next transaction.
|
|
*/
|
|
r = __begin_transaction(pmd);
|
|
out:
|
|
up_write(&pmd->root_lock);
|
|
return r;
|
|
}
|
|
|
|
static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd)
|
|
{
|
|
struct dm_thin_device *td;
|
|
|
|
list_for_each_entry(td, &pmd->thin_devices, list)
|
|
td->aborted_with_changes = td->changed;
|
|
}
|
|
|
|
int dm_pool_abort_metadata(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (pmd->fail_io)
|
|
goto out;
|
|
|
|
__set_abort_with_changes_flags(pmd);
|
|
__destroy_persistent_data_objects(pmd);
|
|
r = __create_persistent_data_objects(pmd, false);
|
|
if (r)
|
|
pmd->fail_io = true;
|
|
|
|
out:
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = dm_sm_get_nr_free(pmd->data_sm, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = dm_sm_get_nr_free(pmd->metadata_sm, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
|
|
dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = dm_sm_get_nr_blocks(pmd->metadata_sm, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = dm_sm_get_nr_blocks(pmd->data_sm, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io) {
|
|
*result = td->mapped_blocks;
|
|
r = 0;
|
|
}
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __highest_block(struct dm_thin_device *td, dm_block_t *result)
|
|
{
|
|
int r;
|
|
__le64 value_le;
|
|
dm_block_t thin_root;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
|
|
r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le);
|
|
if (r)
|
|
return r;
|
|
|
|
thin_root = le64_to_cpu(value_le);
|
|
|
|
return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result);
|
|
}
|
|
|
|
int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
|
|
dm_block_t *result)
|
|
{
|
|
int r = -EINVAL;
|
|
struct dm_pool_metadata *pmd = td->pmd;
|
|
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __highest_block(td, result);
|
|
up_read(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count)
|
|
{
|
|
int r;
|
|
dm_block_t old_count;
|
|
|
|
r = dm_sm_get_nr_blocks(sm, &old_count);
|
|
if (r)
|
|
return r;
|
|
|
|
if (new_count == old_count)
|
|
return 0;
|
|
|
|
if (new_count < old_count) {
|
|
DMERR("cannot reduce size of space map");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return dm_sm_extend(sm, new_count - old_count);
|
|
}
|
|
|
|
int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __resize_space_map(pmd->data_sm, new_count);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
|
|
{
|
|
int r = -EINVAL;
|
|
|
|
down_write(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
r = __resize_space_map(pmd->metadata_sm, new_count);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd)
|
|
{
|
|
down_write(&pmd->root_lock);
|
|
dm_bm_set_read_only(pmd->bm);
|
|
up_write(&pmd->root_lock);
|
|
}
|
|
|
|
void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd)
|
|
{
|
|
down_write(&pmd->root_lock);
|
|
dm_bm_set_read_write(pmd->bm);
|
|
up_write(&pmd->root_lock);
|
|
}
|
|
|
|
int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
|
|
dm_block_t threshold,
|
|
dm_sm_threshold_fn fn,
|
|
void *context)
|
|
{
|
|
int r;
|
|
|
|
down_write(&pmd->root_lock);
|
|
r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context);
|
|
up_write(&pmd->root_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
|
|
{
|
|
int r;
|
|
struct dm_block *sblock;
|
|
struct thin_disk_superblock *disk_super;
|
|
|
|
down_write(&pmd->root_lock);
|
|
pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG;
|
|
|
|
r = superblock_lock(pmd, &sblock);
|
|
if (r) {
|
|
DMERR("couldn't read superblock");
|
|
goto out;
|
|
}
|
|
|
|
disk_super = dm_block_data(sblock);
|
|
disk_super->flags = cpu_to_le32(pmd->flags);
|
|
|
|
dm_bm_unlock(sblock);
|
|
out:
|
|
up_write(&pmd->root_lock);
|
|
return r;
|
|
}
|
|
|
|
bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd)
|
|
{
|
|
bool needs_check;
|
|
|
|
down_read(&pmd->root_lock);
|
|
needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG;
|
|
up_read(&pmd->root_lock);
|
|
|
|
return needs_check;
|
|
}
|
|
|
|
void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd)
|
|
{
|
|
down_read(&pmd->root_lock);
|
|
if (!pmd->fail_io)
|
|
dm_tm_issue_prefetches(pmd->tm);
|
|
up_read(&pmd->root_lock);
|
|
}
|