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path: root/drivers/md/persistent-data/dm-block-manager.c
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Diffstat (limited to 'drivers/md/persistent-data/dm-block-manager.c')
-rw-r--r--drivers/md/persistent-data/dm-block-manager.c67
1 files changed, 41 insertions, 26 deletions
diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index 749ec268d957..1ef71e5fcde7 100644
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2011 Red Hat, Inc.
*
@@ -57,10 +58,10 @@ struct waiter {
int wants_write;
};
-static unsigned __find_holder(struct block_lock *lock,
+static unsigned int __find_holder(struct block_lock *lock,
struct task_struct *task)
{
- unsigned i;
+ unsigned int i;
for (i = 0; i < MAX_HOLDERS; i++)
if (lock->holders[i] == task)
@@ -73,7 +74,7 @@ static unsigned __find_holder(struct block_lock *lock,
/* call this *after* you increment lock->count */
static void __add_holder(struct block_lock *lock, struct task_struct *task)
{
- unsigned h = __find_holder(lock, NULL);
+ unsigned int h = __find_holder(lock, NULL);
#ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
struct stack_store *t;
#endif
@@ -90,14 +91,15 @@ static void __add_holder(struct block_lock *lock, struct task_struct *task)
/* call this *before* you decrement lock->count */
static void __del_holder(struct block_lock *lock, struct task_struct *task)
{
- unsigned h = __find_holder(lock, task);
+ unsigned int h = __find_holder(lock, task);
+
lock->holders[h] = NULL;
put_task_struct(task);
}
static int __check_holder(struct block_lock *lock)
{
- unsigned i;
+ unsigned int i;
for (i = 0; i < MAX_HOLDERS; i++) {
if (lock->holders[i] == current) {
@@ -343,7 +345,7 @@ void *dm_block_data(struct dm_block *b)
EXPORT_SYMBOL_GPL(dm_block_data);
struct buffer_aux {
- struct dm_block_validator *validator;
+ const struct dm_block_validator *validator;
int write_locked;
#ifdef CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING
@@ -354,6 +356,7 @@ struct buffer_aux {
static void dm_block_manager_alloc_callback(struct dm_buffer *buf)
{
struct buffer_aux *aux = dm_bufio_get_aux_data(buf);
+
aux->validator = NULL;
bl_init(&aux->lock);
}
@@ -361,23 +364,26 @@ static void dm_block_manager_alloc_callback(struct dm_buffer *buf)
static void dm_block_manager_write_callback(struct dm_buffer *buf)
{
struct buffer_aux *aux = dm_bufio_get_aux_data(buf);
+
if (aux->validator) {
aux->validator->prepare_for_write(aux->validator, (struct dm_block *) buf,
dm_bufio_get_block_size(dm_bufio_get_client(buf)));
}
}
-/*----------------------------------------------------------------
+/*
+ * -------------------------------------------------------------
* Public interface
- *--------------------------------------------------------------*/
+ *--------------------------------------------------------------
+ */
struct dm_block_manager {
struct dm_bufio_client *bufio;
bool read_only:1;
};
struct dm_block_manager *dm_block_manager_create(struct block_device *bdev,
- unsigned block_size,
- unsigned max_held_per_thread)
+ unsigned int block_size,
+ unsigned int max_held_per_thread)
{
int r;
struct dm_block_manager *bm;
@@ -391,7 +397,8 @@ struct dm_block_manager *dm_block_manager_create(struct block_device *bdev,
bm->bufio = dm_bufio_client_create(bdev, block_size, max_held_per_thread,
sizeof(struct buffer_aux),
dm_block_manager_alloc_callback,
- dm_block_manager_write_callback);
+ dm_block_manager_write_callback,
+ 0);
if (IS_ERR(bm->bufio)) {
r = PTR_ERR(bm->bufio);
kfree(bm);
@@ -414,7 +421,13 @@ void dm_block_manager_destroy(struct dm_block_manager *bm)
}
EXPORT_SYMBOL_GPL(dm_block_manager_destroy);
-unsigned dm_bm_block_size(struct dm_block_manager *bm)
+void dm_block_manager_reset(struct dm_block_manager *bm)
+{
+ dm_bufio_client_reset(bm->bufio);
+}
+EXPORT_SYMBOL_GPL(dm_block_manager_reset);
+
+unsigned int dm_bm_block_size(struct dm_block_manager *bm)
{
return dm_bufio_get_block_size(bm->bufio);
}
@@ -428,10 +441,11 @@ dm_block_t dm_bm_nr_blocks(struct dm_block_manager *bm)
static int dm_bm_validate_buffer(struct dm_block_manager *bm,
struct dm_buffer *buf,
struct buffer_aux *aux,
- struct dm_block_validator *v)
+ const struct dm_block_validator *v)
{
if (unlikely(!aux->validator)) {
int r;
+
if (!v)
return 0;
r = v->check(v, (struct dm_block *) buf, dm_bufio_get_block_size(bm->bufio));
@@ -453,7 +467,7 @@ static int dm_bm_validate_buffer(struct dm_block_manager *bm,
return 0;
}
int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
- struct dm_block_validator *v,
+ const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
@@ -486,14 +500,14 @@ int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
EXPORT_SYMBOL_GPL(dm_bm_read_lock);
int dm_bm_write_lock(struct dm_block_manager *bm,
- dm_block_t b, struct dm_block_validator *v,
+ dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
void *p;
int r;
- if (bm->read_only)
+ if (dm_bm_is_read_only(bm))
return -EPERM;
p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
@@ -522,7 +536,7 @@ int dm_bm_write_lock(struct dm_block_manager *bm,
EXPORT_SYMBOL_GPL(dm_bm_write_lock);
int dm_bm_read_try_lock(struct dm_block_manager *bm,
- dm_block_t b, struct dm_block_validator *v,
+ dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
@@ -555,14 +569,14 @@ int dm_bm_read_try_lock(struct dm_block_manager *bm,
}
int dm_bm_write_lock_zero(struct dm_block_manager *bm,
- dm_block_t b, struct dm_block_validator *v,
+ dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
int r;
struct buffer_aux *aux;
void *p;
- if (bm->read_only)
+ if (dm_bm_is_read_only(bm))
return -EPERM;
p = dm_bufio_new(bm->bufio, b, (struct dm_buffer **) result);
@@ -587,8 +601,7 @@ EXPORT_SYMBOL_GPL(dm_bm_write_lock_zero);
void dm_bm_unlock(struct dm_block *b)
{
- struct buffer_aux *aux;
- aux = dm_bufio_get_aux_data(to_buffer(b));
+ struct buffer_aux *aux = dm_bufio_get_aux_data(to_buffer(b));
if (aux->write_locked) {
dm_bufio_mark_buffer_dirty(to_buffer(b));
@@ -602,7 +615,7 @@ EXPORT_SYMBOL_GPL(dm_bm_unlock);
int dm_bm_flush(struct dm_block_manager *bm)
{
- if (bm->read_only)
+ if (dm_bm_is_read_only(bm))
return -EPERM;
return dm_bufio_write_dirty_buffers(bm->bufio);
@@ -616,19 +629,21 @@ void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b)
bool dm_bm_is_read_only(struct dm_block_manager *bm)
{
- return bm->read_only;
+ return bm ? bm->read_only : true;
}
EXPORT_SYMBOL_GPL(dm_bm_is_read_only);
void dm_bm_set_read_only(struct dm_block_manager *bm)
{
- bm->read_only = true;
+ if (bm)
+ bm->read_only = true;
}
EXPORT_SYMBOL_GPL(dm_bm_set_read_only);
void dm_bm_set_read_write(struct dm_block_manager *bm)
{
- bm->read_only = false;
+ if (bm)
+ bm->read_only = false;
}
EXPORT_SYMBOL_GPL(dm_bm_set_read_write);
@@ -641,7 +656,7 @@ EXPORT_SYMBOL_GPL(dm_bm_checksum);
/*----------------------------------------------------------------*/
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
+MODULE_AUTHOR("Joe Thornber <dm-devel@lists.linux.dev>");
MODULE_DESCRIPTION("Immutable metadata library for dm");
/*----------------------------------------------------------------*/
generated by cgit (git 2.34.1) at 2025-12-26 00:49:28 +0000