![Joe Thornber](/assets/img/avatar_default.png)
This patch implements two new messages that can be sent to the thin pool target allowing it to take a snapshot of the _metadata_. This, read-only snapshot can be accessed by userland, concurrently with the live target. Only one metadata snapshot can be held at a time. The pool's status line will give the block location for the current msnap. Since version 0.1.5 of the userland thin provisioning tools, the thin_dump program displays the msnap as follows: thin_dump -m <msnap root> <metadata dev> Available here: https://github.com/jthornber/thin-provisioning-tools Now that userland can access the metadata we can do various things that have traditionally been kernel side tasks: i) Incremental backups. By using metadata snapshots we can work out what blocks have changed over time. Combined with data snapshots we can ensure the data doesn't change while we back it up. A short proof of concept script can be found here: https://github.com/jthornber/thinp-test-suite/blob/master/incremental_backup_example.rb ii) Migration of thin devices from one pool to another. iii) Merging snapshots back into an external origin. iv) Asyncronous replication. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2850 lines
68 KiB
C
2850 lines
68 KiB
C
/*
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* Copyright (C) 2011 Red Hat UK.
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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 <linux/device-mapper.h>
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#include <linux/dm-io.h>
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#include <linux/dm-kcopyd.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#define DM_MSG_PREFIX "thin"
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/*
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* Tunable constants
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*/
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#define ENDIO_HOOK_POOL_SIZE 10240
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#define DEFERRED_SET_SIZE 64
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#define MAPPING_POOL_SIZE 1024
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#define PRISON_CELLS 1024
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#define COMMIT_PERIOD HZ
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/*
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* The block size of the device holding pool data must be
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* between 64KB and 1GB.
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*/
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#define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT)
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#define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT)
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/*
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* Device id is restricted to 24 bits.
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*/
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#define MAX_DEV_ID ((1 << 24) - 1)
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/*
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* How do we handle breaking sharing of data blocks?
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* =================================================
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*
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* We use a standard copy-on-write btree to store the mappings for the
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* devices (note I'm talking about copy-on-write of the metadata here, not
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* the data). When you take an internal snapshot you clone the root node
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* of the origin btree. After this there is no concept of an origin or a
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* snapshot. They are just two device trees that happen to point to the
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* same data blocks.
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*
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* When we get a write in we decide if it's to a shared data block using
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* some timestamp magic. If it is, we have to break sharing.
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*
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* Let's say we write to a shared block in what was the origin. The
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* steps are:
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*
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* i) plug io further to this physical block. (see bio_prison code).
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*
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* ii) quiesce any read io to that shared data block. Obviously
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* including all devices that share this block. (see deferred_set code)
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*
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* iii) copy the data block to a newly allocate block. This step can be
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* missed out if the io covers the block. (schedule_copy).
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*
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* iv) insert the new mapping into the origin's btree
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* (process_prepared_mapping). This act of inserting breaks some
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* sharing of btree nodes between the two devices. Breaking sharing only
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* effects the btree of that specific device. Btrees for the other
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* devices that share the block never change. The btree for the origin
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* device as it was after the last commit is untouched, ie. we're using
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* persistent data structures in the functional programming sense.
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*
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* v) unplug io to this physical block, including the io that triggered
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* the breaking of sharing.
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*
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* Steps (ii) and (iii) occur in parallel.
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*
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* The metadata _doesn't_ need to be committed before the io continues. We
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* get away with this because the io is always written to a _new_ block.
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* If there's a crash, then:
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*
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* - The origin mapping will point to the old origin block (the shared
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* one). This will contain the data as it was before the io that triggered
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* the breaking of sharing came in.
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*
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* - The snap mapping still points to the old block. As it would after
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* the commit.
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*
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* The downside of this scheme is the timestamp magic isn't perfect, and
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* will continue to think that data block in the snapshot device is shared
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* even after the write to the origin has broken sharing. I suspect data
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* blocks will typically be shared by many different devices, so we're
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* breaking sharing n + 1 times, rather than n, where n is the number of
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* devices that reference this data block. At the moment I think the
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* benefits far, far outweigh the disadvantages.
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*/
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/*----------------------------------------------------------------*/
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/*
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* Sometimes we can't deal with a bio straight away. We put them in prison
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* where they can't cause any mischief. Bios are put in a cell identified
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* by a key, multiple bios can be in the same cell. When the cell is
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* subsequently unlocked the bios become available.
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*/
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struct bio_prison;
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struct cell_key {
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int virtual;
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dm_thin_id dev;
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dm_block_t block;
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};
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struct dm_bio_prison_cell {
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struct hlist_node list;
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struct bio_prison *prison;
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struct cell_key key;
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struct bio *holder;
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struct bio_list bios;
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};
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struct bio_prison {
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spinlock_t lock;
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mempool_t *cell_pool;
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unsigned nr_buckets;
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unsigned hash_mask;
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struct hlist_head *cells;
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};
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static uint32_t calc_nr_buckets(unsigned nr_cells)
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{
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uint32_t n = 128;
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nr_cells /= 4;
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nr_cells = min(nr_cells, 8192u);
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while (n < nr_cells)
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n <<= 1;
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return n;
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}
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static struct kmem_cache *_cell_cache;
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/*
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* @nr_cells should be the number of cells you want in use _concurrently_.
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* Don't confuse it with the number of distinct keys.
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*/
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static struct bio_prison *prison_create(unsigned nr_cells)
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{
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unsigned i;
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uint32_t nr_buckets = calc_nr_buckets(nr_cells);
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size_t len = sizeof(struct bio_prison) +
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(sizeof(struct hlist_head) * nr_buckets);
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struct bio_prison *prison = kmalloc(len, GFP_KERNEL);
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if (!prison)
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return NULL;
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spin_lock_init(&prison->lock);
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prison->cell_pool = mempool_create_slab_pool(nr_cells, _cell_cache);
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if (!prison->cell_pool) {
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kfree(prison);
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return NULL;
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}
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prison->nr_buckets = nr_buckets;
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prison->hash_mask = nr_buckets - 1;
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prison->cells = (struct hlist_head *) (prison + 1);
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for (i = 0; i < nr_buckets; i++)
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INIT_HLIST_HEAD(prison->cells + i);
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return prison;
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}
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static void prison_destroy(struct bio_prison *prison)
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{
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mempool_destroy(prison->cell_pool);
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kfree(prison);
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}
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static uint32_t hash_key(struct bio_prison *prison, struct cell_key *key)
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{
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const unsigned long BIG_PRIME = 4294967291UL;
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uint64_t hash = key->block * BIG_PRIME;
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return (uint32_t) (hash & prison->hash_mask);
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}
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static int keys_equal(struct cell_key *lhs, struct cell_key *rhs)
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{
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return (lhs->virtual == rhs->virtual) &&
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(lhs->dev == rhs->dev) &&
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(lhs->block == rhs->block);
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}
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static struct dm_bio_prison_cell *__search_bucket(struct hlist_head *bucket,
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struct cell_key *key)
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{
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struct dm_bio_prison_cell *cell;
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struct hlist_node *tmp;
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hlist_for_each_entry(cell, tmp, bucket, list)
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if (keys_equal(&cell->key, key))
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return cell;
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return NULL;
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}
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/*
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* This may block if a new cell needs allocating. You must ensure that
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* cells will be unlocked even if the calling thread is blocked.
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*
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* Returns 1 if the cell was already held, 0 if @inmate is the new holder.
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*/
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static int bio_detain(struct bio_prison *prison, struct cell_key *key,
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struct bio *inmate, struct dm_bio_prison_cell **ref)
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{
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int r = 1;
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unsigned long flags;
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uint32_t hash = hash_key(prison, key);
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struct dm_bio_prison_cell *cell, *cell2;
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BUG_ON(hash > prison->nr_buckets);
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spin_lock_irqsave(&prison->lock, flags);
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cell = __search_bucket(prison->cells + hash, key);
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if (cell) {
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bio_list_add(&cell->bios, inmate);
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goto out;
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}
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/*
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* Allocate a new cell
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*/
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spin_unlock_irqrestore(&prison->lock, flags);
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cell2 = mempool_alloc(prison->cell_pool, GFP_NOIO);
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spin_lock_irqsave(&prison->lock, flags);
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/*
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* We've been unlocked, so we have to double check that
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* nobody else has inserted this cell in the meantime.
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*/
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cell = __search_bucket(prison->cells + hash, key);
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if (cell) {
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mempool_free(cell2, prison->cell_pool);
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bio_list_add(&cell->bios, inmate);
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goto out;
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}
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/*
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* Use new cell.
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*/
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cell = cell2;
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cell->prison = prison;
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memcpy(&cell->key, key, sizeof(cell->key));
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cell->holder = inmate;
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bio_list_init(&cell->bios);
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hlist_add_head(&cell->list, prison->cells + hash);
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r = 0;
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out:
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spin_unlock_irqrestore(&prison->lock, flags);
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*ref = cell;
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return r;
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}
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/*
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* @inmates must have been initialised prior to this call
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*/
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static void __cell_release(struct dm_bio_prison_cell *cell, struct bio_list *inmates)
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{
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struct bio_prison *prison = cell->prison;
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hlist_del(&cell->list);
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if (inmates) {
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bio_list_add(inmates, cell->holder);
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bio_list_merge(inmates, &cell->bios);
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}
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mempool_free(cell, prison->cell_pool);
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}
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static void cell_release(struct dm_bio_prison_cell *cell, struct bio_list *bios)
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{
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unsigned long flags;
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struct bio_prison *prison = cell->prison;
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spin_lock_irqsave(&prison->lock, flags);
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__cell_release(cell, bios);
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spin_unlock_irqrestore(&prison->lock, flags);
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}
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/*
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* There are a couple of places where we put a bio into a cell briefly
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* before taking it out again. In these situations we know that no other
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* bio may be in the cell. This function releases the cell, and also does
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* a sanity check.
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*/
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static void __cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio *bio)
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{
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BUG_ON(cell->holder != bio);
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BUG_ON(!bio_list_empty(&cell->bios));
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__cell_release(cell, NULL);
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}
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static void cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio *bio)
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{
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unsigned long flags;
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struct bio_prison *prison = cell->prison;
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spin_lock_irqsave(&prison->lock, flags);
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__cell_release_singleton(cell, bio);
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spin_unlock_irqrestore(&prison->lock, flags);
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}
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/*
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* Sometimes we don't want the holder, just the additional bios.
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*/
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static void __cell_release_no_holder(struct dm_bio_prison_cell *cell,
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struct bio_list *inmates)
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{
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struct bio_prison *prison = cell->prison;
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hlist_del(&cell->list);
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bio_list_merge(inmates, &cell->bios);
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mempool_free(cell, prison->cell_pool);
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}
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static void cell_release_no_holder(struct dm_bio_prison_cell *cell,
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struct bio_list *inmates)
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{
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unsigned long flags;
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struct bio_prison *prison = cell->prison;
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spin_lock_irqsave(&prison->lock, flags);
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__cell_release_no_holder(cell, inmates);
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spin_unlock_irqrestore(&prison->lock, flags);
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}
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static void cell_error(struct dm_bio_prison_cell *cell)
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{
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struct bio_prison *prison = cell->prison;
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struct bio_list bios;
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struct bio *bio;
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unsigned long flags;
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bio_list_init(&bios);
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spin_lock_irqsave(&prison->lock, flags);
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__cell_release(cell, &bios);
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spin_unlock_irqrestore(&prison->lock, flags);
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while ((bio = bio_list_pop(&bios)))
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bio_io_error(bio);
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}
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/*----------------------------------------------------------------*/
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/*
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* We use the deferred set to keep track of pending reads to shared blocks.
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* We do this to ensure the new mapping caused by a write isn't performed
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* until these prior reads have completed. Otherwise the insertion of the
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* new mapping could free the old block that the read bios are mapped to.
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*/
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struct deferred_set;
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struct deferred_entry {
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struct deferred_set *ds;
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unsigned count;
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struct list_head work_items;
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};
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struct deferred_set {
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spinlock_t lock;
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unsigned current_entry;
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unsigned sweeper;
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struct deferred_entry entries[DEFERRED_SET_SIZE];
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};
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static void ds_init(struct deferred_set *ds)
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{
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int i;
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spin_lock_init(&ds->lock);
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ds->current_entry = 0;
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ds->sweeper = 0;
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for (i = 0; i < DEFERRED_SET_SIZE; i++) {
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ds->entries[i].ds = ds;
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ds->entries[i].count = 0;
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INIT_LIST_HEAD(&ds->entries[i].work_items);
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}
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}
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static struct deferred_entry *ds_inc(struct deferred_set *ds)
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{
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unsigned long flags;
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struct deferred_entry *entry;
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spin_lock_irqsave(&ds->lock, flags);
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entry = ds->entries + ds->current_entry;
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entry->count++;
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spin_unlock_irqrestore(&ds->lock, flags);
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return entry;
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}
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static unsigned ds_next(unsigned index)
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{
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return (index + 1) % DEFERRED_SET_SIZE;
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}
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static void __sweep(struct deferred_set *ds, struct list_head *head)
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{
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while ((ds->sweeper != ds->current_entry) &&
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!ds->entries[ds->sweeper].count) {
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list_splice_init(&ds->entries[ds->sweeper].work_items, head);
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ds->sweeper = ds_next(ds->sweeper);
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}
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if ((ds->sweeper == ds->current_entry) && !ds->entries[ds->sweeper].count)
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list_splice_init(&ds->entries[ds->sweeper].work_items, head);
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}
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static void ds_dec(struct deferred_entry *entry, struct list_head *head)
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{
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unsigned long flags;
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spin_lock_irqsave(&entry->ds->lock, flags);
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BUG_ON(!entry->count);
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--entry->count;
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__sweep(entry->ds, head);
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spin_unlock_irqrestore(&entry->ds->lock, flags);
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}
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/*
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* Returns 1 if deferred or 0 if no pending items to delay job.
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*/
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static int ds_add_work(struct deferred_set *ds, struct list_head *work)
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{
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int r = 1;
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unsigned long flags;
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unsigned next_entry;
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spin_lock_irqsave(&ds->lock, flags);
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if ((ds->sweeper == ds->current_entry) &&
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!ds->entries[ds->current_entry].count)
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r = 0;
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else {
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list_add(work, &ds->entries[ds->current_entry].work_items);
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next_entry = ds_next(ds->current_entry);
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if (!ds->entries[next_entry].count)
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ds->current_entry = next_entry;
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}
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spin_unlock_irqrestore(&ds->lock, flags);
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return r;
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}
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/*----------------------------------------------------------------*/
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/*
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* Key building.
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*/
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static void build_data_key(struct dm_thin_device *td,
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dm_block_t b, struct cell_key *key)
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{
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key->virtual = 0;
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key->dev = dm_thin_dev_id(td);
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key->block = b;
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}
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static void build_virtual_key(struct dm_thin_device *td, dm_block_t b,
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struct cell_key *key)
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{
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key->virtual = 1;
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key->dev = dm_thin_dev_id(td);
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key->block = b;
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}
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/*----------------------------------------------------------------*/
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/*
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* A pool device ties together a metadata device and a data device. It
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* also provides the interface for creating and destroying internal
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* devices.
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*/
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struct dm_thin_new_mapping;
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struct pool_features {
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unsigned zero_new_blocks:1;
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unsigned discard_enabled:1;
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unsigned discard_passdown:1;
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};
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|
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struct pool {
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struct list_head list;
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struct dm_target *ti; /* Only set if a pool target is bound */
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|
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struct mapped_device *pool_md;
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struct block_device *md_dev;
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struct dm_pool_metadata *pmd;
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uint32_t sectors_per_block;
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unsigned block_shift;
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dm_block_t offset_mask;
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dm_block_t low_water_blocks;
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struct pool_features pf;
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unsigned low_water_triggered:1; /* A dm event has been sent */
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unsigned no_free_space:1; /* A -ENOSPC warning has been issued */
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|
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struct bio_prison *prison;
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struct dm_kcopyd_client *copier;
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struct workqueue_struct *wq;
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struct work_struct worker;
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struct delayed_work waker;
|
|
|
|
unsigned ref_count;
|
|
unsigned long last_commit_jiffies;
|
|
|
|
spinlock_t lock;
|
|
struct bio_list deferred_bios;
|
|
struct bio_list deferred_flush_bios;
|
|
struct list_head prepared_mappings;
|
|
struct list_head prepared_discards;
|
|
|
|
struct bio_list retry_on_resume_list;
|
|
|
|
struct deferred_set shared_read_ds;
|
|
struct deferred_set all_io_ds;
|
|
|
|
struct dm_thin_new_mapping *next_mapping;
|
|
mempool_t *mapping_pool;
|
|
mempool_t *endio_hook_pool;
|
|
};
|
|
|
|
/*
|
|
* Target context for a pool.
|
|
*/
|
|
struct pool_c {
|
|
struct dm_target *ti;
|
|
struct pool *pool;
|
|
struct dm_dev *data_dev;
|
|
struct dm_dev *metadata_dev;
|
|
struct dm_target_callbacks callbacks;
|
|
|
|
dm_block_t low_water_blocks;
|
|
struct pool_features pf;
|
|
};
|
|
|
|
/*
|
|
* Target context for a thin.
|
|
*/
|
|
struct thin_c {
|
|
struct dm_dev *pool_dev;
|
|
struct dm_dev *origin_dev;
|
|
dm_thin_id dev_id;
|
|
|
|
struct pool *pool;
|
|
struct dm_thin_device *td;
|
|
};
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* A global list of pools that uses a struct mapped_device as a key.
|
|
*/
|
|
static struct dm_thin_pool_table {
|
|
struct mutex mutex;
|
|
struct list_head pools;
|
|
} dm_thin_pool_table;
|
|
|
|
static void pool_table_init(void)
|
|
{
|
|
mutex_init(&dm_thin_pool_table.mutex);
|
|
INIT_LIST_HEAD(&dm_thin_pool_table.pools);
|
|
}
|
|
|
|
static void __pool_table_insert(struct pool *pool)
|
|
{
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
list_add(&pool->list, &dm_thin_pool_table.pools);
|
|
}
|
|
|
|
static void __pool_table_remove(struct pool *pool)
|
|
{
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
list_del(&pool->list);
|
|
}
|
|
|
|
static struct pool *__pool_table_lookup(struct mapped_device *md)
|
|
{
|
|
struct pool *pool = NULL, *tmp;
|
|
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
|
|
list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) {
|
|
if (tmp->pool_md == md) {
|
|
pool = tmp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return pool;
|
|
}
|
|
|
|
static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev)
|
|
{
|
|
struct pool *pool = NULL, *tmp;
|
|
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
|
|
list_for_each_entry(tmp, &dm_thin_pool_table.pools, list) {
|
|
if (tmp->md_dev == md_dev) {
|
|
pool = tmp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return pool;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
struct dm_thin_endio_hook {
|
|
struct thin_c *tc;
|
|
struct deferred_entry *shared_read_entry;
|
|
struct deferred_entry *all_io_entry;
|
|
struct dm_thin_new_mapping *overwrite_mapping;
|
|
};
|
|
|
|
static void __requeue_bio_list(struct thin_c *tc, struct bio_list *master)
|
|
{
|
|
struct bio *bio;
|
|
struct bio_list bios;
|
|
|
|
bio_list_init(&bios);
|
|
bio_list_merge(&bios, master);
|
|
bio_list_init(master);
|
|
|
|
while ((bio = bio_list_pop(&bios))) {
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
|
|
if (h->tc == tc)
|
|
bio_endio(bio, DM_ENDIO_REQUEUE);
|
|
else
|
|
bio_list_add(master, bio);
|
|
}
|
|
}
|
|
|
|
static void requeue_io(struct thin_c *tc)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
__requeue_bio_list(tc, &pool->deferred_bios);
|
|
__requeue_bio_list(tc, &pool->retry_on_resume_list);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This section of code contains the logic for processing a thin device's IO.
|
|
* Much of the code depends on pool object resources (lists, workqueues, etc)
|
|
* but most is exclusively called from the thin target rather than the thin-pool
|
|
* target.
|
|
*/
|
|
|
|
static dm_block_t get_bio_block(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
return bio->bi_sector >> tc->pool->block_shift;
|
|
}
|
|
|
|
static void remap(struct thin_c *tc, struct bio *bio, dm_block_t block)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
|
|
bio->bi_bdev = tc->pool_dev->bdev;
|
|
bio->bi_sector = (block << pool->block_shift) +
|
|
(bio->bi_sector & pool->offset_mask);
|
|
}
|
|
|
|
static void remap_to_origin(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
bio->bi_bdev = tc->origin_dev->bdev;
|
|
}
|
|
|
|
static void issue(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Batch together any FUA/FLUSH bios we find and then issue
|
|
* a single commit for them in process_deferred_bios().
|
|
*/
|
|
if (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) {
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_add(&pool->deferred_flush_bios, bio);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
} else
|
|
generic_make_request(bio);
|
|
}
|
|
|
|
static void remap_to_origin_and_issue(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
remap_to_origin(tc, bio);
|
|
issue(tc, bio);
|
|
}
|
|
|
|
static void remap_and_issue(struct thin_c *tc, struct bio *bio,
|
|
dm_block_t block)
|
|
{
|
|
remap(tc, bio, block);
|
|
issue(tc, bio);
|
|
}
|
|
|
|
/*
|
|
* wake_worker() is used when new work is queued and when pool_resume is
|
|
* ready to continue deferred IO processing.
|
|
*/
|
|
static void wake_worker(struct pool *pool)
|
|
{
|
|
queue_work(pool->wq, &pool->worker);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Bio endio functions.
|
|
*/
|
|
struct dm_thin_new_mapping {
|
|
struct list_head list;
|
|
|
|
unsigned quiesced:1;
|
|
unsigned prepared:1;
|
|
unsigned pass_discard:1;
|
|
|
|
struct thin_c *tc;
|
|
dm_block_t virt_block;
|
|
dm_block_t data_block;
|
|
struct dm_bio_prison_cell *cell, *cell2;
|
|
int err;
|
|
|
|
/*
|
|
* If the bio covers the whole area of a block then we can avoid
|
|
* zeroing or copying. Instead this bio is hooked. The bio will
|
|
* still be in the cell, so care has to be taken to avoid issuing
|
|
* the bio twice.
|
|
*/
|
|
struct bio *bio;
|
|
bio_end_io_t *saved_bi_end_io;
|
|
};
|
|
|
|
static void __maybe_add_mapping(struct dm_thin_new_mapping *m)
|
|
{
|
|
struct pool *pool = m->tc->pool;
|
|
|
|
if (m->quiesced && m->prepared) {
|
|
list_add(&m->list, &pool->prepared_mappings);
|
|
wake_worker(pool);
|
|
}
|
|
}
|
|
|
|
static void copy_complete(int read_err, unsigned long write_err, void *context)
|
|
{
|
|
unsigned long flags;
|
|
struct dm_thin_new_mapping *m = context;
|
|
struct pool *pool = m->tc->pool;
|
|
|
|
m->err = read_err || write_err ? -EIO : 0;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
m->prepared = 1;
|
|
__maybe_add_mapping(m);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
static void overwrite_endio(struct bio *bio, int err)
|
|
{
|
|
unsigned long flags;
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
struct dm_thin_new_mapping *m = h->overwrite_mapping;
|
|
struct pool *pool = m->tc->pool;
|
|
|
|
m->err = err;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
m->prepared = 1;
|
|
__maybe_add_mapping(m);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Workqueue.
|
|
*/
|
|
|
|
/*
|
|
* Prepared mapping jobs.
|
|
*/
|
|
|
|
/*
|
|
* This sends the bios in the cell back to the deferred_bios list.
|
|
*/
|
|
static void cell_defer(struct thin_c *tc, struct dm_bio_prison_cell *cell,
|
|
dm_block_t data_block)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
cell_release(cell, &pool->deferred_bios);
|
|
spin_unlock_irqrestore(&tc->pool->lock, flags);
|
|
|
|
wake_worker(pool);
|
|
}
|
|
|
|
/*
|
|
* Same as cell_defer above, except it omits one particular detainee,
|
|
* a write bio that covers the block and has already been processed.
|
|
*/
|
|
static void cell_defer_except(struct thin_c *tc, struct dm_bio_prison_cell *cell)
|
|
{
|
|
struct bio_list bios;
|
|
struct pool *pool = tc->pool;
|
|
unsigned long flags;
|
|
|
|
bio_list_init(&bios);
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
cell_release_no_holder(cell, &pool->deferred_bios);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
wake_worker(pool);
|
|
}
|
|
|
|
static void process_prepared_mapping(struct dm_thin_new_mapping *m)
|
|
{
|
|
struct thin_c *tc = m->tc;
|
|
struct bio *bio;
|
|
int r;
|
|
|
|
bio = m->bio;
|
|
if (bio)
|
|
bio->bi_end_io = m->saved_bi_end_io;
|
|
|
|
if (m->err) {
|
|
cell_error(m->cell);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Commit the prepared block into the mapping btree.
|
|
* Any I/O for this block arriving after this point will get
|
|
* remapped to it directly.
|
|
*/
|
|
r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block);
|
|
if (r) {
|
|
DMERR("dm_thin_insert_block() failed");
|
|
cell_error(m->cell);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Release any bios held while the block was being provisioned.
|
|
* If we are processing a write bio that completely covers the block,
|
|
* we already processed it so can ignore it now when processing
|
|
* the bios in the cell.
|
|
*/
|
|
if (bio) {
|
|
cell_defer_except(tc, m->cell);
|
|
bio_endio(bio, 0);
|
|
} else
|
|
cell_defer(tc, m->cell, m->data_block);
|
|
|
|
list_del(&m->list);
|
|
mempool_free(m, tc->pool->mapping_pool);
|
|
}
|
|
|
|
static void process_prepared_discard(struct dm_thin_new_mapping *m)
|
|
{
|
|
int r;
|
|
struct thin_c *tc = m->tc;
|
|
|
|
r = dm_thin_remove_block(tc->td, m->virt_block);
|
|
if (r)
|
|
DMERR("dm_thin_remove_block() failed");
|
|
|
|
/*
|
|
* Pass the discard down to the underlying device?
|
|
*/
|
|
if (m->pass_discard)
|
|
remap_and_issue(tc, m->bio, m->data_block);
|
|
else
|
|
bio_endio(m->bio, 0);
|
|
|
|
cell_defer_except(tc, m->cell);
|
|
cell_defer_except(tc, m->cell2);
|
|
mempool_free(m, tc->pool->mapping_pool);
|
|
}
|
|
|
|
static void process_prepared(struct pool *pool, struct list_head *head,
|
|
void (*fn)(struct dm_thin_new_mapping *))
|
|
{
|
|
unsigned long flags;
|
|
struct list_head maps;
|
|
struct dm_thin_new_mapping *m, *tmp;
|
|
|
|
INIT_LIST_HEAD(&maps);
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
list_splice_init(head, &maps);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
list_for_each_entry_safe(m, tmp, &maps, list)
|
|
fn(m);
|
|
}
|
|
|
|
/*
|
|
* Deferred bio jobs.
|
|
*/
|
|
static int io_overlaps_block(struct pool *pool, struct bio *bio)
|
|
{
|
|
return !(bio->bi_sector & pool->offset_mask) &&
|
|
(bio->bi_size == (pool->sectors_per_block << SECTOR_SHIFT));
|
|
|
|
}
|
|
|
|
static int io_overwrites_block(struct pool *pool, struct bio *bio)
|
|
{
|
|
return (bio_data_dir(bio) == WRITE) &&
|
|
io_overlaps_block(pool, bio);
|
|
}
|
|
|
|
static void save_and_set_endio(struct bio *bio, bio_end_io_t **save,
|
|
bio_end_io_t *fn)
|
|
{
|
|
*save = bio->bi_end_io;
|
|
bio->bi_end_io = fn;
|
|
}
|
|
|
|
static int ensure_next_mapping(struct pool *pool)
|
|
{
|
|
if (pool->next_mapping)
|
|
return 0;
|
|
|
|
pool->next_mapping = mempool_alloc(pool->mapping_pool, GFP_ATOMIC);
|
|
|
|
return pool->next_mapping ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool)
|
|
{
|
|
struct dm_thin_new_mapping *r = pool->next_mapping;
|
|
|
|
BUG_ON(!pool->next_mapping);
|
|
|
|
pool->next_mapping = NULL;
|
|
|
|
return r;
|
|
}
|
|
|
|
static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
|
|
struct dm_dev *origin, dm_block_t data_origin,
|
|
dm_block_t data_dest,
|
|
struct dm_bio_prison_cell *cell, struct bio *bio)
|
|
{
|
|
int r;
|
|
struct pool *pool = tc->pool;
|
|
struct dm_thin_new_mapping *m = get_next_mapping(pool);
|
|
|
|
INIT_LIST_HEAD(&m->list);
|
|
m->quiesced = 0;
|
|
m->prepared = 0;
|
|
m->tc = tc;
|
|
m->virt_block = virt_block;
|
|
m->data_block = data_dest;
|
|
m->cell = cell;
|
|
m->err = 0;
|
|
m->bio = NULL;
|
|
|
|
if (!ds_add_work(&pool->shared_read_ds, &m->list))
|
|
m->quiesced = 1;
|
|
|
|
/*
|
|
* IO to pool_dev remaps to the pool target's data_dev.
|
|
*
|
|
* If the whole block of data is being overwritten, we can issue the
|
|
* bio immediately. Otherwise we use kcopyd to clone the data first.
|
|
*/
|
|
if (io_overwrites_block(pool, bio)) {
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
|
|
h->overwrite_mapping = m;
|
|
m->bio = bio;
|
|
save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio);
|
|
remap_and_issue(tc, bio, data_dest);
|
|
} else {
|
|
struct dm_io_region from, to;
|
|
|
|
from.bdev = origin->bdev;
|
|
from.sector = data_origin * pool->sectors_per_block;
|
|
from.count = pool->sectors_per_block;
|
|
|
|
to.bdev = tc->pool_dev->bdev;
|
|
to.sector = data_dest * pool->sectors_per_block;
|
|
to.count = pool->sectors_per_block;
|
|
|
|
r = dm_kcopyd_copy(pool->copier, &from, 1, &to,
|
|
0, copy_complete, m);
|
|
if (r < 0) {
|
|
mempool_free(m, pool->mapping_pool);
|
|
DMERR("dm_kcopyd_copy() failed");
|
|
cell_error(cell);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void schedule_internal_copy(struct thin_c *tc, dm_block_t virt_block,
|
|
dm_block_t data_origin, dm_block_t data_dest,
|
|
struct dm_bio_prison_cell *cell, struct bio *bio)
|
|
{
|
|
schedule_copy(tc, virt_block, tc->pool_dev,
|
|
data_origin, data_dest, cell, bio);
|
|
}
|
|
|
|
static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block,
|
|
dm_block_t data_dest,
|
|
struct dm_bio_prison_cell *cell, struct bio *bio)
|
|
{
|
|
schedule_copy(tc, virt_block, tc->origin_dev,
|
|
virt_block, data_dest, cell, bio);
|
|
}
|
|
|
|
static void schedule_zero(struct thin_c *tc, dm_block_t virt_block,
|
|
dm_block_t data_block, struct dm_bio_prison_cell *cell,
|
|
struct bio *bio)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
struct dm_thin_new_mapping *m = get_next_mapping(pool);
|
|
|
|
INIT_LIST_HEAD(&m->list);
|
|
m->quiesced = 1;
|
|
m->prepared = 0;
|
|
m->tc = tc;
|
|
m->virt_block = virt_block;
|
|
m->data_block = data_block;
|
|
m->cell = cell;
|
|
m->err = 0;
|
|
m->bio = NULL;
|
|
|
|
/*
|
|
* If the whole block of data is being overwritten or we are not
|
|
* zeroing pre-existing data, we can issue the bio immediately.
|
|
* Otherwise we use kcopyd to zero the data first.
|
|
*/
|
|
if (!pool->pf.zero_new_blocks)
|
|
process_prepared_mapping(m);
|
|
|
|
else if (io_overwrites_block(pool, bio)) {
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
|
|
h->overwrite_mapping = m;
|
|
m->bio = bio;
|
|
save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio);
|
|
remap_and_issue(tc, bio, data_block);
|
|
} else {
|
|
int r;
|
|
struct dm_io_region to;
|
|
|
|
to.bdev = tc->pool_dev->bdev;
|
|
to.sector = data_block * pool->sectors_per_block;
|
|
to.count = pool->sectors_per_block;
|
|
|
|
r = dm_kcopyd_zero(pool->copier, 1, &to, 0, copy_complete, m);
|
|
if (r < 0) {
|
|
mempool_free(m, pool->mapping_pool);
|
|
DMERR("dm_kcopyd_zero() failed");
|
|
cell_error(cell);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
|
|
{
|
|
int r;
|
|
dm_block_t free_blocks;
|
|
unsigned long flags;
|
|
struct pool *pool = tc->pool;
|
|
|
|
r = dm_pool_get_free_block_count(pool->pmd, &free_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) {
|
|
DMWARN("%s: reached low water mark, sending event.",
|
|
dm_device_name(pool->pool_md));
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
pool->low_water_triggered = 1;
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
dm_table_event(pool->ti->table);
|
|
}
|
|
|
|
if (!free_blocks) {
|
|
if (pool->no_free_space)
|
|
return -ENOSPC;
|
|
else {
|
|
/*
|
|
* Try to commit to see if that will free up some
|
|
* more space.
|
|
*/
|
|
r = dm_pool_commit_metadata(pool->pmd);
|
|
if (r) {
|
|
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
|
|
__func__, r);
|
|
return r;
|
|
}
|
|
|
|
r = dm_pool_get_free_block_count(pool->pmd, &free_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* If we still have no space we set a flag to avoid
|
|
* doing all this checking and return -ENOSPC.
|
|
*/
|
|
if (!free_blocks) {
|
|
DMWARN("%s: no free space available.",
|
|
dm_device_name(pool->pool_md));
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
pool->no_free_space = 1;
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
return -ENOSPC;
|
|
}
|
|
}
|
|
}
|
|
|
|
r = dm_pool_alloc_data_block(pool->pmd, result);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we have run out of space, queue bios until the device is
|
|
* resumed, presumably after having been reloaded with more space.
|
|
*/
|
|
static void retry_on_resume(struct bio *bio)
|
|
{
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
struct thin_c *tc = h->tc;
|
|
struct pool *pool = tc->pool;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_add(&pool->retry_on_resume_list, bio);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
static void no_space(struct dm_bio_prison_cell *cell)
|
|
{
|
|
struct bio *bio;
|
|
struct bio_list bios;
|
|
|
|
bio_list_init(&bios);
|
|
cell_release(cell, &bios);
|
|
|
|
while ((bio = bio_list_pop(&bios)))
|
|
retry_on_resume(bio);
|
|
}
|
|
|
|
static void process_discard(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
int r;
|
|
unsigned long flags;
|
|
struct pool *pool = tc->pool;
|
|
struct dm_bio_prison_cell *cell, *cell2;
|
|
struct cell_key key, key2;
|
|
dm_block_t block = get_bio_block(tc, bio);
|
|
struct dm_thin_lookup_result lookup_result;
|
|
struct dm_thin_new_mapping *m;
|
|
|
|
build_virtual_key(tc->td, block, &key);
|
|
if (bio_detain(tc->pool->prison, &key, bio, &cell))
|
|
return;
|
|
|
|
r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
|
|
switch (r) {
|
|
case 0:
|
|
/*
|
|
* Check nobody is fiddling with this pool block. This can
|
|
* happen if someone's in the process of breaking sharing
|
|
* on this block.
|
|
*/
|
|
build_data_key(tc->td, lookup_result.block, &key2);
|
|
if (bio_detain(tc->pool->prison, &key2, bio, &cell2)) {
|
|
cell_release_singleton(cell, bio);
|
|
break;
|
|
}
|
|
|
|
if (io_overlaps_block(pool, bio)) {
|
|
/*
|
|
* IO may still be going to the destination block. We must
|
|
* quiesce before we can do the removal.
|
|
*/
|
|
m = get_next_mapping(pool);
|
|
m->tc = tc;
|
|
m->pass_discard = (!lookup_result.shared) & pool->pf.discard_passdown;
|
|
m->virt_block = block;
|
|
m->data_block = lookup_result.block;
|
|
m->cell = cell;
|
|
m->cell2 = cell2;
|
|
m->err = 0;
|
|
m->bio = bio;
|
|
|
|
if (!ds_add_work(&pool->all_io_ds, &m->list)) {
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
list_add(&m->list, &pool->prepared_discards);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
wake_worker(pool);
|
|
}
|
|
} else {
|
|
/*
|
|
* This path is hit if people are ignoring
|
|
* limits->discard_granularity. It ignores any
|
|
* part of the discard that is in a subsequent
|
|
* block.
|
|
*/
|
|
sector_t offset = bio->bi_sector - (block << pool->block_shift);
|
|
unsigned remaining = (pool->sectors_per_block - offset) << 9;
|
|
bio->bi_size = min(bio->bi_size, remaining);
|
|
|
|
cell_release_singleton(cell, bio);
|
|
cell_release_singleton(cell2, bio);
|
|
remap_and_issue(tc, bio, lookup_result.block);
|
|
}
|
|
break;
|
|
|
|
case -ENODATA:
|
|
/*
|
|
* It isn't provisioned, just forget it.
|
|
*/
|
|
cell_release_singleton(cell, bio);
|
|
bio_endio(bio, 0);
|
|
break;
|
|
|
|
default:
|
|
DMERR("discard: find block unexpectedly returned %d", r);
|
|
cell_release_singleton(cell, bio);
|
|
bio_io_error(bio);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block,
|
|
struct cell_key *key,
|
|
struct dm_thin_lookup_result *lookup_result,
|
|
struct dm_bio_prison_cell *cell)
|
|
{
|
|
int r;
|
|
dm_block_t data_block;
|
|
|
|
r = alloc_data_block(tc, &data_block);
|
|
switch (r) {
|
|
case 0:
|
|
schedule_internal_copy(tc, block, lookup_result->block,
|
|
data_block, cell, bio);
|
|
break;
|
|
|
|
case -ENOSPC:
|
|
no_space(cell);
|
|
break;
|
|
|
|
default:
|
|
DMERR("%s: alloc_data_block() failed, error = %d", __func__, r);
|
|
cell_error(cell);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void process_shared_bio(struct thin_c *tc, struct bio *bio,
|
|
dm_block_t block,
|
|
struct dm_thin_lookup_result *lookup_result)
|
|
{
|
|
struct dm_bio_prison_cell *cell;
|
|
struct pool *pool = tc->pool;
|
|
struct cell_key key;
|
|
|
|
/*
|
|
* If cell is already occupied, then sharing is already in the process
|
|
* of being broken so we have nothing further to do here.
|
|
*/
|
|
build_data_key(tc->td, lookup_result->block, &key);
|
|
if (bio_detain(pool->prison, &key, bio, &cell))
|
|
return;
|
|
|
|
if (bio_data_dir(bio) == WRITE)
|
|
break_sharing(tc, bio, block, &key, lookup_result, cell);
|
|
else {
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
|
|
h->shared_read_entry = ds_inc(&pool->shared_read_ds);
|
|
|
|
cell_release_singleton(cell, bio);
|
|
remap_and_issue(tc, bio, lookup_result->block);
|
|
}
|
|
}
|
|
|
|
static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block,
|
|
struct dm_bio_prison_cell *cell)
|
|
{
|
|
int r;
|
|
dm_block_t data_block;
|
|
|
|
/*
|
|
* Remap empty bios (flushes) immediately, without provisioning.
|
|
*/
|
|
if (!bio->bi_size) {
|
|
cell_release_singleton(cell, bio);
|
|
remap_and_issue(tc, bio, 0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Fill read bios with zeroes and complete them immediately.
|
|
*/
|
|
if (bio_data_dir(bio) == READ) {
|
|
zero_fill_bio(bio);
|
|
cell_release_singleton(cell, bio);
|
|
bio_endio(bio, 0);
|
|
return;
|
|
}
|
|
|
|
r = alloc_data_block(tc, &data_block);
|
|
switch (r) {
|
|
case 0:
|
|
if (tc->origin_dev)
|
|
schedule_external_copy(tc, block, data_block, cell, bio);
|
|
else
|
|
schedule_zero(tc, block, data_block, cell, bio);
|
|
break;
|
|
|
|
case -ENOSPC:
|
|
no_space(cell);
|
|
break;
|
|
|
|
default:
|
|
DMERR("%s: alloc_data_block() failed, error = %d", __func__, r);
|
|
cell_error(cell);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void process_bio(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
int r;
|
|
dm_block_t block = get_bio_block(tc, bio);
|
|
struct dm_bio_prison_cell *cell;
|
|
struct cell_key key;
|
|
struct dm_thin_lookup_result lookup_result;
|
|
|
|
/*
|
|
* If cell is already occupied, then the block is already
|
|
* being provisioned so we have nothing further to do here.
|
|
*/
|
|
build_virtual_key(tc->td, block, &key);
|
|
if (bio_detain(tc->pool->prison, &key, bio, &cell))
|
|
return;
|
|
|
|
r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
|
|
switch (r) {
|
|
case 0:
|
|
/*
|
|
* We can release this cell now. This thread is the only
|
|
* one that puts bios into a cell, and we know there were
|
|
* no preceding bios.
|
|
*/
|
|
/*
|
|
* TODO: this will probably have to change when discard goes
|
|
* back in.
|
|
*/
|
|
cell_release_singleton(cell, bio);
|
|
|
|
if (lookup_result.shared)
|
|
process_shared_bio(tc, bio, block, &lookup_result);
|
|
else
|
|
remap_and_issue(tc, bio, lookup_result.block);
|
|
break;
|
|
|
|
case -ENODATA:
|
|
if (bio_data_dir(bio) == READ && tc->origin_dev) {
|
|
cell_release_singleton(cell, bio);
|
|
remap_to_origin_and_issue(tc, bio);
|
|
} else
|
|
provision_block(tc, bio, block, cell);
|
|
break;
|
|
|
|
default:
|
|
DMERR("dm_thin_find_block() failed, error = %d", r);
|
|
cell_release_singleton(cell, bio);
|
|
bio_io_error(bio);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int need_commit_due_to_time(struct pool *pool)
|
|
{
|
|
return jiffies < pool->last_commit_jiffies ||
|
|
jiffies > pool->last_commit_jiffies + COMMIT_PERIOD;
|
|
}
|
|
|
|
static void process_deferred_bios(struct pool *pool)
|
|
{
|
|
unsigned long flags;
|
|
struct bio *bio;
|
|
struct bio_list bios;
|
|
int r;
|
|
|
|
bio_list_init(&bios);
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_merge(&bios, &pool->deferred_bios);
|
|
bio_list_init(&pool->deferred_bios);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
while ((bio = bio_list_pop(&bios))) {
|
|
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
|
|
struct thin_c *tc = h->tc;
|
|
|
|
/*
|
|
* If we've got no free new_mapping structs, and processing
|
|
* this bio might require one, we pause until there are some
|
|
* prepared mappings to process.
|
|
*/
|
|
if (ensure_next_mapping(pool)) {
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_merge(&pool->deferred_bios, &bios);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
break;
|
|
}
|
|
|
|
if (bio->bi_rw & REQ_DISCARD)
|
|
process_discard(tc, bio);
|
|
else
|
|
process_bio(tc, bio);
|
|
}
|
|
|
|
/*
|
|
* If there are any deferred flush bios, we must commit
|
|
* the metadata before issuing them.
|
|
*/
|
|
bio_list_init(&bios);
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_merge(&bios, &pool->deferred_flush_bios);
|
|
bio_list_init(&pool->deferred_flush_bios);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
if (bio_list_empty(&bios) && !need_commit_due_to_time(pool))
|
|
return;
|
|
|
|
r = dm_pool_commit_metadata(pool->pmd);
|
|
if (r) {
|
|
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
|
|
__func__, r);
|
|
while ((bio = bio_list_pop(&bios)))
|
|
bio_io_error(bio);
|
|
return;
|
|
}
|
|
pool->last_commit_jiffies = jiffies;
|
|
|
|
while ((bio = bio_list_pop(&bios)))
|
|
generic_make_request(bio);
|
|
}
|
|
|
|
static void do_worker(struct work_struct *ws)
|
|
{
|
|
struct pool *pool = container_of(ws, struct pool, worker);
|
|
|
|
process_prepared(pool, &pool->prepared_mappings, process_prepared_mapping);
|
|
process_prepared(pool, &pool->prepared_discards, process_prepared_discard);
|
|
process_deferred_bios(pool);
|
|
}
|
|
|
|
/*
|
|
* We want to commit periodically so that not too much
|
|
* unwritten data builds up.
|
|
*/
|
|
static void do_waker(struct work_struct *ws)
|
|
{
|
|
struct pool *pool = container_of(to_delayed_work(ws), struct pool, waker);
|
|
wake_worker(pool);
|
|
queue_delayed_work(pool->wq, &pool->waker, COMMIT_PERIOD);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Mapping functions.
|
|
*/
|
|
|
|
/*
|
|
* Called only while mapping a thin bio to hand it over to the workqueue.
|
|
*/
|
|
static void thin_defer_bio(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
unsigned long flags;
|
|
struct pool *pool = tc->pool;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio_list_add(&pool->deferred_bios, bio);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
wake_worker(pool);
|
|
}
|
|
|
|
static struct dm_thin_endio_hook *thin_hook_bio(struct thin_c *tc, struct bio *bio)
|
|
{
|
|
struct pool *pool = tc->pool;
|
|
struct dm_thin_endio_hook *h = mempool_alloc(pool->endio_hook_pool, GFP_NOIO);
|
|
|
|
h->tc = tc;
|
|
h->shared_read_entry = NULL;
|
|
h->all_io_entry = bio->bi_rw & REQ_DISCARD ? NULL : ds_inc(&pool->all_io_ds);
|
|
h->overwrite_mapping = NULL;
|
|
|
|
return h;
|
|
}
|
|
|
|
/*
|
|
* Non-blocking function called from the thin target's map function.
|
|
*/
|
|
static int thin_bio_map(struct dm_target *ti, struct bio *bio,
|
|
union map_info *map_context)
|
|
{
|
|
int r;
|
|
struct thin_c *tc = ti->private;
|
|
dm_block_t block = get_bio_block(tc, bio);
|
|
struct dm_thin_device *td = tc->td;
|
|
struct dm_thin_lookup_result result;
|
|
|
|
map_context->ptr = thin_hook_bio(tc, bio);
|
|
if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)) {
|
|
thin_defer_bio(tc, bio);
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
r = dm_thin_find_block(td, block, 0, &result);
|
|
|
|
/*
|
|
* Note that we defer readahead too.
|
|
*/
|
|
switch (r) {
|
|
case 0:
|
|
if (unlikely(result.shared)) {
|
|
/*
|
|
* We have a race condition here between the
|
|
* result.shared value returned by the lookup and
|
|
* snapshot creation, which may cause new
|
|
* sharing.
|
|
*
|
|
* To avoid this always quiesce the origin before
|
|
* taking the snap. You want to do this anyway to
|
|
* ensure a consistent application view
|
|
* (i.e. lockfs).
|
|
*
|
|
* More distant ancestors are irrelevant. The
|
|
* shared flag will be set in their case.
|
|
*/
|
|
thin_defer_bio(tc, bio);
|
|
r = DM_MAPIO_SUBMITTED;
|
|
} else {
|
|
remap(tc, bio, result.block);
|
|
r = DM_MAPIO_REMAPPED;
|
|
}
|
|
break;
|
|
|
|
case -ENODATA:
|
|
/*
|
|
* In future, the failed dm_thin_find_block above could
|
|
* provide the hint to load the metadata into cache.
|
|
*/
|
|
case -EWOULDBLOCK:
|
|
thin_defer_bio(tc, bio);
|
|
r = DM_MAPIO_SUBMITTED;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int pool_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
|
|
{
|
|
int r;
|
|
unsigned long flags;
|
|
struct pool_c *pt = container_of(cb, struct pool_c, callbacks);
|
|
|
|
spin_lock_irqsave(&pt->pool->lock, flags);
|
|
r = !bio_list_empty(&pt->pool->retry_on_resume_list);
|
|
spin_unlock_irqrestore(&pt->pool->lock, flags);
|
|
|
|
if (!r) {
|
|
struct request_queue *q = bdev_get_queue(pt->data_dev->bdev);
|
|
r = bdi_congested(&q->backing_dev_info, bdi_bits);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static void __requeue_bios(struct pool *pool)
|
|
{
|
|
bio_list_merge(&pool->deferred_bios, &pool->retry_on_resume_list);
|
|
bio_list_init(&pool->retry_on_resume_list);
|
|
}
|
|
|
|
/*----------------------------------------------------------------
|
|
* Binding of control targets to a pool object
|
|
*--------------------------------------------------------------*/
|
|
static int bind_control_target(struct pool *pool, struct dm_target *ti)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
|
|
pool->ti = ti;
|
|
pool->low_water_blocks = pt->low_water_blocks;
|
|
pool->pf = pt->pf;
|
|
|
|
/*
|
|
* If discard_passdown was enabled verify that the data device
|
|
* supports discards. Disable discard_passdown if not; otherwise
|
|
* -EOPNOTSUPP will be returned.
|
|
*/
|
|
if (pt->pf.discard_passdown) {
|
|
struct request_queue *q = bdev_get_queue(pt->data_dev->bdev);
|
|
if (!q || !blk_queue_discard(q)) {
|
|
char buf[BDEVNAME_SIZE];
|
|
DMWARN("Discard unsupported by data device (%s): Disabling discard passdown.",
|
|
bdevname(pt->data_dev->bdev, buf));
|
|
pool->pf.discard_passdown = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void unbind_control_target(struct pool *pool, struct dm_target *ti)
|
|
{
|
|
if (pool->ti == ti)
|
|
pool->ti = NULL;
|
|
}
|
|
|
|
/*----------------------------------------------------------------
|
|
* Pool creation
|
|
*--------------------------------------------------------------*/
|
|
/* Initialize pool features. */
|
|
static void pool_features_init(struct pool_features *pf)
|
|
{
|
|
pf->zero_new_blocks = 1;
|
|
pf->discard_enabled = 1;
|
|
pf->discard_passdown = 1;
|
|
}
|
|
|
|
static void __pool_destroy(struct pool *pool)
|
|
{
|
|
__pool_table_remove(pool);
|
|
|
|
if (dm_pool_metadata_close(pool->pmd) < 0)
|
|
DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
|
|
|
|
prison_destroy(pool->prison);
|
|
dm_kcopyd_client_destroy(pool->copier);
|
|
|
|
if (pool->wq)
|
|
destroy_workqueue(pool->wq);
|
|
|
|
if (pool->next_mapping)
|
|
mempool_free(pool->next_mapping, pool->mapping_pool);
|
|
mempool_destroy(pool->mapping_pool);
|
|
mempool_destroy(pool->endio_hook_pool);
|
|
kfree(pool);
|
|
}
|
|
|
|
static struct kmem_cache *_new_mapping_cache;
|
|
static struct kmem_cache *_endio_hook_cache;
|
|
|
|
static struct pool *pool_create(struct mapped_device *pool_md,
|
|
struct block_device *metadata_dev,
|
|
unsigned long block_size, char **error)
|
|
{
|
|
int r;
|
|
void *err_p;
|
|
struct pool *pool;
|
|
struct dm_pool_metadata *pmd;
|
|
|
|
pmd = dm_pool_metadata_open(metadata_dev, block_size);
|
|
if (IS_ERR(pmd)) {
|
|
*error = "Error creating metadata object";
|
|
return (struct pool *)pmd;
|
|
}
|
|
|
|
pool = kmalloc(sizeof(*pool), GFP_KERNEL);
|
|
if (!pool) {
|
|
*error = "Error allocating memory for pool";
|
|
err_p = ERR_PTR(-ENOMEM);
|
|
goto bad_pool;
|
|
}
|
|
|
|
pool->pmd = pmd;
|
|
pool->sectors_per_block = block_size;
|
|
pool->block_shift = ffs(block_size) - 1;
|
|
pool->offset_mask = block_size - 1;
|
|
pool->low_water_blocks = 0;
|
|
pool_features_init(&pool->pf);
|
|
pool->prison = prison_create(PRISON_CELLS);
|
|
if (!pool->prison) {
|
|
*error = "Error creating pool's bio prison";
|
|
err_p = ERR_PTR(-ENOMEM);
|
|
goto bad_prison;
|
|
}
|
|
|
|
pool->copier = dm_kcopyd_client_create();
|
|
if (IS_ERR(pool->copier)) {
|
|
r = PTR_ERR(pool->copier);
|
|
*error = "Error creating pool's kcopyd client";
|
|
err_p = ERR_PTR(r);
|
|
goto bad_kcopyd_client;
|
|
}
|
|
|
|
/*
|
|
* Create singlethreaded workqueue that will service all devices
|
|
* that use this metadata.
|
|
*/
|
|
pool->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM);
|
|
if (!pool->wq) {
|
|
*error = "Error creating pool's workqueue";
|
|
err_p = ERR_PTR(-ENOMEM);
|
|
goto bad_wq;
|
|
}
|
|
|
|
INIT_WORK(&pool->worker, do_worker);
|
|
INIT_DELAYED_WORK(&pool->waker, do_waker);
|
|
spin_lock_init(&pool->lock);
|
|
bio_list_init(&pool->deferred_bios);
|
|
bio_list_init(&pool->deferred_flush_bios);
|
|
INIT_LIST_HEAD(&pool->prepared_mappings);
|
|
INIT_LIST_HEAD(&pool->prepared_discards);
|
|
pool->low_water_triggered = 0;
|
|
pool->no_free_space = 0;
|
|
bio_list_init(&pool->retry_on_resume_list);
|
|
ds_init(&pool->shared_read_ds);
|
|
ds_init(&pool->all_io_ds);
|
|
|
|
pool->next_mapping = NULL;
|
|
pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE,
|
|
_new_mapping_cache);
|
|
if (!pool->mapping_pool) {
|
|
*error = "Error creating pool's mapping mempool";
|
|
err_p = ERR_PTR(-ENOMEM);
|
|
goto bad_mapping_pool;
|
|
}
|
|
|
|
pool->endio_hook_pool = mempool_create_slab_pool(ENDIO_HOOK_POOL_SIZE,
|
|
_endio_hook_cache);
|
|
if (!pool->endio_hook_pool) {
|
|
*error = "Error creating pool's endio_hook mempool";
|
|
err_p = ERR_PTR(-ENOMEM);
|
|
goto bad_endio_hook_pool;
|
|
}
|
|
pool->ref_count = 1;
|
|
pool->last_commit_jiffies = jiffies;
|
|
pool->pool_md = pool_md;
|
|
pool->md_dev = metadata_dev;
|
|
__pool_table_insert(pool);
|
|
|
|
return pool;
|
|
|
|
bad_endio_hook_pool:
|
|
mempool_destroy(pool->mapping_pool);
|
|
bad_mapping_pool:
|
|
destroy_workqueue(pool->wq);
|
|
bad_wq:
|
|
dm_kcopyd_client_destroy(pool->copier);
|
|
bad_kcopyd_client:
|
|
prison_destroy(pool->prison);
|
|
bad_prison:
|
|
kfree(pool);
|
|
bad_pool:
|
|
if (dm_pool_metadata_close(pmd))
|
|
DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
|
|
|
|
return err_p;
|
|
}
|
|
|
|
static void __pool_inc(struct pool *pool)
|
|
{
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
pool->ref_count++;
|
|
}
|
|
|
|
static void __pool_dec(struct pool *pool)
|
|
{
|
|
BUG_ON(!mutex_is_locked(&dm_thin_pool_table.mutex));
|
|
BUG_ON(!pool->ref_count);
|
|
if (!--pool->ref_count)
|
|
__pool_destroy(pool);
|
|
}
|
|
|
|
static struct pool *__pool_find(struct mapped_device *pool_md,
|
|
struct block_device *metadata_dev,
|
|
unsigned long block_size, char **error,
|
|
int *created)
|
|
{
|
|
struct pool *pool = __pool_table_lookup_metadata_dev(metadata_dev);
|
|
|
|
if (pool) {
|
|
if (pool->pool_md != pool_md)
|
|
return ERR_PTR(-EBUSY);
|
|
__pool_inc(pool);
|
|
|
|
} else {
|
|
pool = __pool_table_lookup(pool_md);
|
|
if (pool) {
|
|
if (pool->md_dev != metadata_dev)
|
|
return ERR_PTR(-EINVAL);
|
|
__pool_inc(pool);
|
|
|
|
} else {
|
|
pool = pool_create(pool_md, metadata_dev, block_size, error);
|
|
*created = 1;
|
|
}
|
|
}
|
|
|
|
return pool;
|
|
}
|
|
|
|
/*----------------------------------------------------------------
|
|
* Pool target methods
|
|
*--------------------------------------------------------------*/
|
|
static void pool_dtr(struct dm_target *ti)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
|
|
mutex_lock(&dm_thin_pool_table.mutex);
|
|
|
|
unbind_control_target(pt->pool, ti);
|
|
__pool_dec(pt->pool);
|
|
dm_put_device(ti, pt->metadata_dev);
|
|
dm_put_device(ti, pt->data_dev);
|
|
kfree(pt);
|
|
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
}
|
|
|
|
static int parse_pool_features(struct dm_arg_set *as, struct pool_features *pf,
|
|
struct dm_target *ti)
|
|
{
|
|
int r;
|
|
unsigned argc;
|
|
const char *arg_name;
|
|
|
|
static struct dm_arg _args[] = {
|
|
{0, 3, "Invalid number of pool feature arguments"},
|
|
};
|
|
|
|
/*
|
|
* No feature arguments supplied.
|
|
*/
|
|
if (!as->argc)
|
|
return 0;
|
|
|
|
r = dm_read_arg_group(_args, as, &argc, &ti->error);
|
|
if (r)
|
|
return -EINVAL;
|
|
|
|
while (argc && !r) {
|
|
arg_name = dm_shift_arg(as);
|
|
argc--;
|
|
|
|
if (!strcasecmp(arg_name, "skip_block_zeroing")) {
|
|
pf->zero_new_blocks = 0;
|
|
continue;
|
|
} else if (!strcasecmp(arg_name, "ignore_discard")) {
|
|
pf->discard_enabled = 0;
|
|
continue;
|
|
} else if (!strcasecmp(arg_name, "no_discard_passdown")) {
|
|
pf->discard_passdown = 0;
|
|
continue;
|
|
}
|
|
|
|
ti->error = "Unrecognised pool feature requested";
|
|
r = -EINVAL;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* thin-pool <metadata dev> <data dev>
|
|
* <data block size (sectors)>
|
|
* <low water mark (blocks)>
|
|
* [<#feature args> [<arg>]*]
|
|
*
|
|
* Optional feature arguments are:
|
|
* skip_block_zeroing: skips the zeroing of newly-provisioned blocks.
|
|
* ignore_discard: disable discard
|
|
* no_discard_passdown: don't pass discards down to the data device
|
|
*/
|
|
static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
int r, pool_created = 0;
|
|
struct pool_c *pt;
|
|
struct pool *pool;
|
|
struct pool_features pf;
|
|
struct dm_arg_set as;
|
|
struct dm_dev *data_dev;
|
|
unsigned long block_size;
|
|
dm_block_t low_water_blocks;
|
|
struct dm_dev *metadata_dev;
|
|
sector_t metadata_dev_size;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
/*
|
|
* FIXME Remove validation from scope of lock.
|
|
*/
|
|
mutex_lock(&dm_thin_pool_table.mutex);
|
|
|
|
if (argc < 4) {
|
|
ti->error = "Invalid argument count";
|
|
r = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
as.argc = argc;
|
|
as.argv = argv;
|
|
|
|
r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &metadata_dev);
|
|
if (r) {
|
|
ti->error = "Error opening metadata block device";
|
|
goto out_unlock;
|
|
}
|
|
|
|
metadata_dev_size = i_size_read(metadata_dev->bdev->bd_inode) >> SECTOR_SHIFT;
|
|
if (metadata_dev_size > THIN_METADATA_MAX_SECTORS_WARNING)
|
|
DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.",
|
|
bdevname(metadata_dev->bdev, b), THIN_METADATA_MAX_SECTORS);
|
|
|
|
r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &data_dev);
|
|
if (r) {
|
|
ti->error = "Error getting data device";
|
|
goto out_metadata;
|
|
}
|
|
|
|
if (kstrtoul(argv[2], 10, &block_size) || !block_size ||
|
|
block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS ||
|
|
block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS ||
|
|
!is_power_of_2(block_size)) {
|
|
ti->error = "Invalid block size";
|
|
r = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (kstrtoull(argv[3], 10, (unsigned long long *)&low_water_blocks)) {
|
|
ti->error = "Invalid low water mark";
|
|
r = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Set default pool features.
|
|
*/
|
|
pool_features_init(&pf);
|
|
|
|
dm_consume_args(&as, 4);
|
|
r = parse_pool_features(&as, &pf, ti);
|
|
if (r)
|
|
goto out;
|
|
|
|
pt = kzalloc(sizeof(*pt), GFP_KERNEL);
|
|
if (!pt) {
|
|
r = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev,
|
|
block_size, &ti->error, &pool_created);
|
|
if (IS_ERR(pool)) {
|
|
r = PTR_ERR(pool);
|
|
goto out_free_pt;
|
|
}
|
|
|
|
/*
|
|
* 'pool_created' reflects whether this is the first table load.
|
|
* Top level discard support is not allowed to be changed after
|
|
* initial load. This would require a pool reload to trigger thin
|
|
* device changes.
|
|
*/
|
|
if (!pool_created && pf.discard_enabled != pool->pf.discard_enabled) {
|
|
ti->error = "Discard support cannot be disabled once enabled";
|
|
r = -EINVAL;
|
|
goto out_flags_changed;
|
|
}
|
|
|
|
pt->pool = pool;
|
|
pt->ti = ti;
|
|
pt->metadata_dev = metadata_dev;
|
|
pt->data_dev = data_dev;
|
|
pt->low_water_blocks = low_water_blocks;
|
|
pt->pf = pf;
|
|
ti->num_flush_requests = 1;
|
|
/*
|
|
* Only need to enable discards if the pool should pass
|
|
* them down to the data device. The thin device's discard
|
|
* processing will cause mappings to be removed from the btree.
|
|
*/
|
|
if (pf.discard_enabled && pf.discard_passdown) {
|
|
ti->num_discard_requests = 1;
|
|
/*
|
|
* Setting 'discards_supported' circumvents the normal
|
|
* stacking of discard limits (this keeps the pool and
|
|
* thin devices' discard limits consistent).
|
|
*/
|
|
ti->discards_supported = 1;
|
|
}
|
|
ti->private = pt;
|
|
|
|
pt->callbacks.congested_fn = pool_is_congested;
|
|
dm_table_add_target_callbacks(ti->table, &pt->callbacks);
|
|
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
|
|
return 0;
|
|
|
|
out_flags_changed:
|
|
__pool_dec(pool);
|
|
out_free_pt:
|
|
kfree(pt);
|
|
out:
|
|
dm_put_device(ti, data_dev);
|
|
out_metadata:
|
|
dm_put_device(ti, metadata_dev);
|
|
out_unlock:
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int pool_map(struct dm_target *ti, struct bio *bio,
|
|
union map_info *map_context)
|
|
{
|
|
int r;
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* As this is a singleton target, ti->begin is always zero.
|
|
*/
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
bio->bi_bdev = pt->data_dev->bdev;
|
|
r = DM_MAPIO_REMAPPED;
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Retrieves the number of blocks of the data device from
|
|
* the superblock and compares it to the actual device size,
|
|
* thus resizing the data device in case it has grown.
|
|
*
|
|
* This both copes with opening preallocated data devices in the ctr
|
|
* being followed by a resume
|
|
* -and-
|
|
* calling the resume method individually after userspace has
|
|
* grown the data device in reaction to a table event.
|
|
*/
|
|
static int pool_preresume(struct dm_target *ti)
|
|
{
|
|
int r;
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
dm_block_t data_size, sb_data_size;
|
|
|
|
/*
|
|
* Take control of the pool object.
|
|
*/
|
|
r = bind_control_target(pool, ti);
|
|
if (r)
|
|
return r;
|
|
|
|
data_size = ti->len >> pool->block_shift;
|
|
r = dm_pool_get_data_dev_size(pool->pmd, &sb_data_size);
|
|
if (r) {
|
|
DMERR("failed to retrieve data device size");
|
|
return r;
|
|
}
|
|
|
|
if (data_size < sb_data_size) {
|
|
DMERR("pool target too small, is %llu blocks (expected %llu)",
|
|
data_size, sb_data_size);
|
|
return -EINVAL;
|
|
|
|
} else if (data_size > sb_data_size) {
|
|
r = dm_pool_resize_data_dev(pool->pmd, data_size);
|
|
if (r) {
|
|
DMERR("failed to resize data device");
|
|
return r;
|
|
}
|
|
|
|
r = dm_pool_commit_metadata(pool->pmd);
|
|
if (r) {
|
|
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
|
|
__func__, r);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pool_resume(struct dm_target *ti)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
pool->low_water_triggered = 0;
|
|
pool->no_free_space = 0;
|
|
__requeue_bios(pool);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
|
|
do_waker(&pool->waker.work);
|
|
}
|
|
|
|
static void pool_postsuspend(struct dm_target *ti)
|
|
{
|
|
int r;
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
|
|
cancel_delayed_work(&pool->waker);
|
|
flush_workqueue(pool->wq);
|
|
|
|
r = dm_pool_commit_metadata(pool->pmd);
|
|
if (r < 0) {
|
|
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
|
|
__func__, r);
|
|
/* FIXME: invalidate device? error the next FUA or FLUSH bio ?*/
|
|
}
|
|
}
|
|
|
|
static int check_arg_count(unsigned argc, unsigned args_required)
|
|
{
|
|
if (argc != args_required) {
|
|
DMWARN("Message received with %u arguments instead of %u.",
|
|
argc, args_required);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_dev_id(char *arg, dm_thin_id *dev_id, int warning)
|
|
{
|
|
if (!kstrtoull(arg, 10, (unsigned long long *)dev_id) &&
|
|
*dev_id <= MAX_DEV_ID)
|
|
return 0;
|
|
|
|
if (warning)
|
|
DMWARN("Message received with invalid device id: %s", arg);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int process_create_thin_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
dm_thin_id dev_id;
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 2);
|
|
if (r)
|
|
return r;
|
|
|
|
r = read_dev_id(argv[1], &dev_id, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_create_thin(pool->pmd, dev_id);
|
|
if (r) {
|
|
DMWARN("Creation of new thinly-provisioned device with id %s failed.",
|
|
argv[1]);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_create_snap_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
dm_thin_id dev_id;
|
|
dm_thin_id origin_dev_id;
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 3);
|
|
if (r)
|
|
return r;
|
|
|
|
r = read_dev_id(argv[1], &dev_id, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = read_dev_id(argv[2], &origin_dev_id, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_create_snap(pool->pmd, dev_id, origin_dev_id);
|
|
if (r) {
|
|
DMWARN("Creation of new snapshot %s of device %s failed.",
|
|
argv[1], argv[2]);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_delete_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
dm_thin_id dev_id;
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 2);
|
|
if (r)
|
|
return r;
|
|
|
|
r = read_dev_id(argv[1], &dev_id, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_delete_thin_device(pool->pmd, dev_id);
|
|
if (r)
|
|
DMWARN("Deletion of thin device %s failed.", argv[1]);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int process_set_transaction_id_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
dm_thin_id old_id, new_id;
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 3);
|
|
if (r)
|
|
return r;
|
|
|
|
if (kstrtoull(argv[1], 10, (unsigned long long *)&old_id)) {
|
|
DMWARN("set_transaction_id message: Unrecognised id %s.", argv[1]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kstrtoull(argv[2], 10, (unsigned long long *)&new_id)) {
|
|
DMWARN("set_transaction_id message: Unrecognised new id %s.", argv[2]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = dm_pool_set_metadata_transaction_id(pool->pmd, old_id, new_id);
|
|
if (r) {
|
|
DMWARN("Failed to change transaction id from %s to %s.",
|
|
argv[1], argv[2]);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_reserve_metadata_snap(pool->pmd);
|
|
if (r)
|
|
DMWARN("reserve_metadata_snap message failed.");
|
|
|
|
return r;
|
|
}
|
|
|
|
static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct pool *pool)
|
|
{
|
|
int r;
|
|
|
|
r = check_arg_count(argc, 1);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_release_metadata_snap(pool->pmd);
|
|
if (r)
|
|
DMWARN("release_metadata_snap message failed.");
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Messages supported:
|
|
* create_thin <dev_id>
|
|
* create_snap <dev_id> <origin_id>
|
|
* delete <dev_id>
|
|
* trim <dev_id> <new_size_in_sectors>
|
|
* set_transaction_id <current_trans_id> <new_trans_id>
|
|
* reserve_metadata_snap
|
|
* release_metadata_snap
|
|
*/
|
|
static int pool_message(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
int r = -EINVAL;
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
|
|
if (!strcasecmp(argv[0], "create_thin"))
|
|
r = process_create_thin_mesg(argc, argv, pool);
|
|
|
|
else if (!strcasecmp(argv[0], "create_snap"))
|
|
r = process_create_snap_mesg(argc, argv, pool);
|
|
|
|
else if (!strcasecmp(argv[0], "delete"))
|
|
r = process_delete_mesg(argc, argv, pool);
|
|
|
|
else if (!strcasecmp(argv[0], "set_transaction_id"))
|
|
r = process_set_transaction_id_mesg(argc, argv, pool);
|
|
|
|
else if (!strcasecmp(argv[0], "reserve_metadata_snap"))
|
|
r = process_reserve_metadata_snap_mesg(argc, argv, pool);
|
|
|
|
else if (!strcasecmp(argv[0], "release_metadata_snap"))
|
|
r = process_release_metadata_snap_mesg(argc, argv, pool);
|
|
|
|
else
|
|
DMWARN("Unrecognised thin pool target message received: %s", argv[0]);
|
|
|
|
if (!r) {
|
|
r = dm_pool_commit_metadata(pool->pmd);
|
|
if (r)
|
|
DMERR("%s message: dm_pool_commit_metadata() failed, error = %d",
|
|
argv[0], r);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Status line is:
|
|
* <transaction id> <used metadata sectors>/<total metadata sectors>
|
|
* <used data sectors>/<total data sectors> <held metadata root>
|
|
*/
|
|
static int pool_status(struct dm_target *ti, status_type_t type,
|
|
char *result, unsigned maxlen)
|
|
{
|
|
int r, count;
|
|
unsigned sz = 0;
|
|
uint64_t transaction_id;
|
|
dm_block_t nr_free_blocks_data;
|
|
dm_block_t nr_free_blocks_metadata;
|
|
dm_block_t nr_blocks_data;
|
|
dm_block_t nr_blocks_metadata;
|
|
dm_block_t held_root;
|
|
char buf[BDEVNAME_SIZE];
|
|
char buf2[BDEVNAME_SIZE];
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
r = dm_pool_get_metadata_transaction_id(pool->pmd,
|
|
&transaction_id);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_get_free_metadata_block_count(pool->pmd,
|
|
&nr_free_blocks_metadata);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_get_metadata_dev_size(pool->pmd, &nr_blocks_metadata);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_get_free_block_count(pool->pmd,
|
|
&nr_free_blocks_data);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_get_data_dev_size(pool->pmd, &nr_blocks_data);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_pool_get_metadata_snap(pool->pmd, &held_root);
|
|
if (r)
|
|
return r;
|
|
|
|
DMEMIT("%llu %llu/%llu %llu/%llu ",
|
|
(unsigned long long)transaction_id,
|
|
(unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata),
|
|
(unsigned long long)nr_blocks_metadata,
|
|
(unsigned long long)(nr_blocks_data - nr_free_blocks_data),
|
|
(unsigned long long)nr_blocks_data);
|
|
|
|
if (held_root)
|
|
DMEMIT("%llu", held_root);
|
|
else
|
|
DMEMIT("-");
|
|
|
|
break;
|
|
|
|
case STATUSTYPE_TABLE:
|
|
DMEMIT("%s %s %lu %llu ",
|
|
format_dev_t(buf, pt->metadata_dev->bdev->bd_dev),
|
|
format_dev_t(buf2, pt->data_dev->bdev->bd_dev),
|
|
(unsigned long)pool->sectors_per_block,
|
|
(unsigned long long)pt->low_water_blocks);
|
|
|
|
count = !pool->pf.zero_new_blocks + !pool->pf.discard_enabled +
|
|
!pt->pf.discard_passdown;
|
|
DMEMIT("%u ", count);
|
|
|
|
if (!pool->pf.zero_new_blocks)
|
|
DMEMIT("skip_block_zeroing ");
|
|
|
|
if (!pool->pf.discard_enabled)
|
|
DMEMIT("ignore_discard ");
|
|
|
|
if (!pt->pf.discard_passdown)
|
|
DMEMIT("no_discard_passdown ");
|
|
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pool_iterate_devices(struct dm_target *ti,
|
|
iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
|
|
return fn(ti, pt->data_dev, 0, ti->len, data);
|
|
}
|
|
|
|
static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
|
|
struct bio_vec *biovec, int max_size)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
struct request_queue *q = bdev_get_queue(pt->data_dev->bdev);
|
|
|
|
if (!q->merge_bvec_fn)
|
|
return max_size;
|
|
|
|
bvm->bi_bdev = pt->data_dev->bdev;
|
|
|
|
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
|
|
}
|
|
|
|
static void set_discard_limits(struct pool *pool, struct queue_limits *limits)
|
|
{
|
|
/*
|
|
* FIXME: these limits may be incompatible with the pool's data device
|
|
*/
|
|
limits->max_discard_sectors = pool->sectors_per_block;
|
|
|
|
/*
|
|
* This is just a hint, and not enforced. We have to cope with
|
|
* bios that overlap 2 blocks.
|
|
*/
|
|
limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
|
|
limits->discard_zeroes_data = pool->pf.zero_new_blocks;
|
|
}
|
|
|
|
static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits)
|
|
{
|
|
struct pool_c *pt = ti->private;
|
|
struct pool *pool = pt->pool;
|
|
|
|
blk_limits_io_min(limits, 0);
|
|
blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT);
|
|
if (pool->pf.discard_enabled)
|
|
set_discard_limits(pool, limits);
|
|
}
|
|
|
|
static struct target_type pool_target = {
|
|
.name = "thin-pool",
|
|
.features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
|
|
DM_TARGET_IMMUTABLE,
|
|
.version = {1, 2, 0},
|
|
.module = THIS_MODULE,
|
|
.ctr = pool_ctr,
|
|
.dtr = pool_dtr,
|
|
.map = pool_map,
|
|
.postsuspend = pool_postsuspend,
|
|
.preresume = pool_preresume,
|
|
.resume = pool_resume,
|
|
.message = pool_message,
|
|
.status = pool_status,
|
|
.merge = pool_merge,
|
|
.iterate_devices = pool_iterate_devices,
|
|
.io_hints = pool_io_hints,
|
|
};
|
|
|
|
/*----------------------------------------------------------------
|
|
* Thin target methods
|
|
*--------------------------------------------------------------*/
|
|
static void thin_dtr(struct dm_target *ti)
|
|
{
|
|
struct thin_c *tc = ti->private;
|
|
|
|
mutex_lock(&dm_thin_pool_table.mutex);
|
|
|
|
__pool_dec(tc->pool);
|
|
dm_pool_close_thin_device(tc->td);
|
|
dm_put_device(ti, tc->pool_dev);
|
|
if (tc->origin_dev)
|
|
dm_put_device(ti, tc->origin_dev);
|
|
kfree(tc);
|
|
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
}
|
|
|
|
/*
|
|
* Thin target parameters:
|
|
*
|
|
* <pool_dev> <dev_id> [origin_dev]
|
|
*
|
|
* pool_dev: the path to the pool (eg, /dev/mapper/my_pool)
|
|
* dev_id: the internal device identifier
|
|
* origin_dev: a device external to the pool that should act as the origin
|
|
*
|
|
* If the pool device has discards disabled, they get disabled for the thin
|
|
* device as well.
|
|
*/
|
|
static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
int r;
|
|
struct thin_c *tc;
|
|
struct dm_dev *pool_dev, *origin_dev;
|
|
struct mapped_device *pool_md;
|
|
|
|
mutex_lock(&dm_thin_pool_table.mutex);
|
|
|
|
if (argc != 2 && argc != 3) {
|
|
ti->error = "Invalid argument count";
|
|
r = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
tc = ti->private = kzalloc(sizeof(*tc), GFP_KERNEL);
|
|
if (!tc) {
|
|
ti->error = "Out of memory";
|
|
r = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (argc == 3) {
|
|
r = dm_get_device(ti, argv[2], FMODE_READ, &origin_dev);
|
|
if (r) {
|
|
ti->error = "Error opening origin device";
|
|
goto bad_origin_dev;
|
|
}
|
|
tc->origin_dev = origin_dev;
|
|
}
|
|
|
|
r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &pool_dev);
|
|
if (r) {
|
|
ti->error = "Error opening pool device";
|
|
goto bad_pool_dev;
|
|
}
|
|
tc->pool_dev = pool_dev;
|
|
|
|
if (read_dev_id(argv[1], (unsigned long long *)&tc->dev_id, 0)) {
|
|
ti->error = "Invalid device id";
|
|
r = -EINVAL;
|
|
goto bad_common;
|
|
}
|
|
|
|
pool_md = dm_get_md(tc->pool_dev->bdev->bd_dev);
|
|
if (!pool_md) {
|
|
ti->error = "Couldn't get pool mapped device";
|
|
r = -EINVAL;
|
|
goto bad_common;
|
|
}
|
|
|
|
tc->pool = __pool_table_lookup(pool_md);
|
|
if (!tc->pool) {
|
|
ti->error = "Couldn't find pool object";
|
|
r = -EINVAL;
|
|
goto bad_pool_lookup;
|
|
}
|
|
__pool_inc(tc->pool);
|
|
|
|
r = dm_pool_open_thin_device(tc->pool->pmd, tc->dev_id, &tc->td);
|
|
if (r) {
|
|
ti->error = "Couldn't open thin internal device";
|
|
goto bad_thin_open;
|
|
}
|
|
|
|
ti->split_io = tc->pool->sectors_per_block;
|
|
ti->num_flush_requests = 1;
|
|
|
|
/* In case the pool supports discards, pass them on. */
|
|
if (tc->pool->pf.discard_enabled) {
|
|
ti->discards_supported = 1;
|
|
ti->num_discard_requests = 1;
|
|
}
|
|
|
|
dm_put(pool_md);
|
|
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
|
|
return 0;
|
|
|
|
bad_thin_open:
|
|
__pool_dec(tc->pool);
|
|
bad_pool_lookup:
|
|
dm_put(pool_md);
|
|
bad_common:
|
|
dm_put_device(ti, tc->pool_dev);
|
|
bad_pool_dev:
|
|
if (tc->origin_dev)
|
|
dm_put_device(ti, tc->origin_dev);
|
|
bad_origin_dev:
|
|
kfree(tc);
|
|
out_unlock:
|
|
mutex_unlock(&dm_thin_pool_table.mutex);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int thin_map(struct dm_target *ti, struct bio *bio,
|
|
union map_info *map_context)
|
|
{
|
|
bio->bi_sector = dm_target_offset(ti, bio->bi_sector);
|
|
|
|
return thin_bio_map(ti, bio, map_context);
|
|
}
|
|
|
|
static int thin_endio(struct dm_target *ti,
|
|
struct bio *bio, int err,
|
|
union map_info *map_context)
|
|
{
|
|
unsigned long flags;
|
|
struct dm_thin_endio_hook *h = map_context->ptr;
|
|
struct list_head work;
|
|
struct dm_thin_new_mapping *m, *tmp;
|
|
struct pool *pool = h->tc->pool;
|
|
|
|
if (h->shared_read_entry) {
|
|
INIT_LIST_HEAD(&work);
|
|
ds_dec(h->shared_read_entry, &work);
|
|
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
list_for_each_entry_safe(m, tmp, &work, list) {
|
|
list_del(&m->list);
|
|
m->quiesced = 1;
|
|
__maybe_add_mapping(m);
|
|
}
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
if (h->all_io_entry) {
|
|
INIT_LIST_HEAD(&work);
|
|
ds_dec(h->all_io_entry, &work);
|
|
spin_lock_irqsave(&pool->lock, flags);
|
|
list_for_each_entry_safe(m, tmp, &work, list)
|
|
list_add(&m->list, &pool->prepared_discards);
|
|
spin_unlock_irqrestore(&pool->lock, flags);
|
|
}
|
|
|
|
mempool_free(h, pool->endio_hook_pool);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void thin_postsuspend(struct dm_target *ti)
|
|
{
|
|
if (dm_noflush_suspending(ti))
|
|
requeue_io((struct thin_c *)ti->private);
|
|
}
|
|
|
|
/*
|
|
* <nr mapped sectors> <highest mapped sector>
|
|
*/
|
|
static int thin_status(struct dm_target *ti, status_type_t type,
|
|
char *result, unsigned maxlen)
|
|
{
|
|
int r;
|
|
ssize_t sz = 0;
|
|
dm_block_t mapped, highest;
|
|
char buf[BDEVNAME_SIZE];
|
|
struct thin_c *tc = ti->private;
|
|
|
|
if (!tc->td)
|
|
DMEMIT("-");
|
|
else {
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
r = dm_thin_get_mapped_count(tc->td, &mapped);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_thin_get_highest_mapped_block(tc->td, &highest);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
DMEMIT("%llu ", mapped * tc->pool->sectors_per_block);
|
|
if (r)
|
|
DMEMIT("%llu", ((highest + 1) *
|
|
tc->pool->sectors_per_block) - 1);
|
|
else
|
|
DMEMIT("-");
|
|
break;
|
|
|
|
case STATUSTYPE_TABLE:
|
|
DMEMIT("%s %lu",
|
|
format_dev_t(buf, tc->pool_dev->bdev->bd_dev),
|
|
(unsigned long) tc->dev_id);
|
|
if (tc->origin_dev)
|
|
DMEMIT(" %s", format_dev_t(buf, tc->origin_dev->bdev->bd_dev));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int thin_iterate_devices(struct dm_target *ti,
|
|
iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
dm_block_t blocks;
|
|
struct thin_c *tc = ti->private;
|
|
|
|
/*
|
|
* We can't call dm_pool_get_data_dev_size() since that blocks. So
|
|
* we follow a more convoluted path through to the pool's target.
|
|
*/
|
|
if (!tc->pool->ti)
|
|
return 0; /* nothing is bound */
|
|
|
|
blocks = tc->pool->ti->len >> tc->pool->block_shift;
|
|
if (blocks)
|
|
return fn(ti, tc->pool_dev, 0, tc->pool->sectors_per_block * blocks, data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
|
|
{
|
|
struct thin_c *tc = ti->private;
|
|
struct pool *pool = tc->pool;
|
|
|
|
blk_limits_io_min(limits, 0);
|
|
blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT);
|
|
set_discard_limits(pool, limits);
|
|
}
|
|
|
|
static struct target_type thin_target = {
|
|
.name = "thin",
|
|
.version = {1, 1, 0},
|
|
.module = THIS_MODULE,
|
|
.ctr = thin_ctr,
|
|
.dtr = thin_dtr,
|
|
.map = thin_map,
|
|
.end_io = thin_endio,
|
|
.postsuspend = thin_postsuspend,
|
|
.status = thin_status,
|
|
.iterate_devices = thin_iterate_devices,
|
|
.io_hints = thin_io_hints,
|
|
};
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int __init dm_thin_init(void)
|
|
{
|
|
int r;
|
|
|
|
pool_table_init();
|
|
|
|
r = dm_register_target(&thin_target);
|
|
if (r)
|
|
return r;
|
|
|
|
r = dm_register_target(&pool_target);
|
|
if (r)
|
|
goto bad_pool_target;
|
|
|
|
r = -ENOMEM;
|
|
|
|
_cell_cache = KMEM_CACHE(dm_bio_prison_cell, 0);
|
|
if (!_cell_cache)
|
|
goto bad_cell_cache;
|
|
|
|
_new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0);
|
|
if (!_new_mapping_cache)
|
|
goto bad_new_mapping_cache;
|
|
|
|
_endio_hook_cache = KMEM_CACHE(dm_thin_endio_hook, 0);
|
|
if (!_endio_hook_cache)
|
|
goto bad_endio_hook_cache;
|
|
|
|
return 0;
|
|
|
|
bad_endio_hook_cache:
|
|
kmem_cache_destroy(_new_mapping_cache);
|
|
bad_new_mapping_cache:
|
|
kmem_cache_destroy(_cell_cache);
|
|
bad_cell_cache:
|
|
dm_unregister_target(&pool_target);
|
|
bad_pool_target:
|
|
dm_unregister_target(&thin_target);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void dm_thin_exit(void)
|
|
{
|
|
dm_unregister_target(&thin_target);
|
|
dm_unregister_target(&pool_target);
|
|
|
|
kmem_cache_destroy(_cell_cache);
|
|
kmem_cache_destroy(_new_mapping_cache);
|
|
kmem_cache_destroy(_endio_hook_cache);
|
|
}
|
|
|
|
module_init(dm_thin_init);
|
|
module_exit(dm_thin_exit);
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " thin provisioning target");
|
|
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|