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dm thin: don't allow changing data device during thin-pool reload
[ Upstream commit 873937e75f
]
The existing code allows changing the data device when the thin-pool
target is reloaded.
This capability is not required and only complicates device lifetime
guarantees. This can cause crashes like the one reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=1788596
where the kernel tries to issue a flush bio located in a structure that
was already freed.
Take the first step to simplifying the thin-pool's data device lifetime
by disallowing changing it. Like the thin-pool's metadata device, the
data device is now set in pool_create() and it cannot be changed for a
given thin-pool.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
74f42a7731
commit
7f0d9ac262
1 changed files with 13 additions and 5 deletions
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@ -231,6 +231,7 @@ struct pool {
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struct dm_target *ti; /* Only set if a pool target is bound */
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struct mapped_device *pool_md;
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struct block_device *data_dev;
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struct block_device *md_dev;
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struct dm_pool_metadata *pmd;
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@ -2945,6 +2946,7 @@ static struct kmem_cache *_new_mapping_cache;
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static struct pool *pool_create(struct mapped_device *pool_md,
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struct block_device *metadata_dev,
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struct block_device *data_dev,
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unsigned long block_size,
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int read_only, char **error)
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{
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@ -3052,6 +3054,7 @@ static struct pool *pool_create(struct mapped_device *pool_md,
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pool->last_commit_jiffies = jiffies;
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pool->pool_md = pool_md;
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pool->md_dev = metadata_dev;
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pool->data_dev = data_dev;
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__pool_table_insert(pool);
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return pool;
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@ -3093,6 +3096,7 @@ static void __pool_dec(struct pool *pool)
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static struct pool *__pool_find(struct mapped_device *pool_md,
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struct block_device *metadata_dev,
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struct block_device *data_dev,
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unsigned long block_size, int read_only,
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char **error, int *created)
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{
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@ -3103,19 +3107,23 @@ static struct pool *__pool_find(struct mapped_device *pool_md,
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*error = "metadata device already in use by a pool";
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return ERR_PTR(-EBUSY);
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}
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if (pool->data_dev != data_dev) {
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*error = "data device already in use by a pool";
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return ERR_PTR(-EBUSY);
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}
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__pool_inc(pool);
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} else {
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pool = __pool_table_lookup(pool_md);
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if (pool) {
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if (pool->md_dev != metadata_dev) {
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if (pool->md_dev != metadata_dev || pool->data_dev != data_dev) {
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*error = "different pool cannot replace a pool";
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return ERR_PTR(-EINVAL);
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}
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__pool_inc(pool);
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} else {
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pool = pool_create(pool_md, metadata_dev, block_size, read_only, error);
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pool = pool_create(pool_md, metadata_dev, data_dev, block_size, read_only, error);
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*created = 1;
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}
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}
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@ -3368,7 +3376,7 @@ static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv)
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goto out;
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}
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pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev,
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pool = __pool_find(dm_table_get_md(ti->table), metadata_dev->bdev, data_dev->bdev,
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block_size, pf.mode == PM_READ_ONLY, &ti->error, &pool_created);
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if (IS_ERR(pool)) {
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r = PTR_ERR(pool);
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@ -4114,7 +4122,7 @@ static struct target_type pool_target = {
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.name = "thin-pool",
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.features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
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DM_TARGET_IMMUTABLE,
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.version = {1, 21, 0},
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.version = {1, 22, 0},
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.module = THIS_MODULE,
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.ctr = pool_ctr,
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.dtr = pool_dtr,
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@ -4493,7 +4501,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
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static struct target_type thin_target = {
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.name = "thin",
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.version = {1, 21, 0},
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.version = {1, 22, 0},
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.module = THIS_MODULE,
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.ctr = thin_ctr,
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.dtr = thin_dtr,
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