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idr: Add new APIs to support unsigned long 

The following new APIs are added:

int idr_alloc_ext(struct idr *idr, void *ptr, unsigned long *index,
                  unsigned long start, unsigned long end, gfp_t gfp);
void *idr_remove_ext(struct idr *idr, unsigned long id);
void *idr_find_ext(const struct idr *idr, unsigned long id);
void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id);
void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);

Signed-off-by: Chris Mi <chrism@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Mi 2017-08-30 02:31:57 -04:00 committed by David S. Miller
parent c2f8a6cee6
commit 388f79fda7
4 changed files with 125 additions and 37 deletions
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69
include/linux/idr.h
View File

@ -80,17 +80,73 @@ static inline void idr_set_cursor(struct idr *idr, unsigned int val)
*/
void idr_preload(gfp_t gfp_mask);
int idr_alloc(struct idr *, void *entry, int start, int end, gfp_t);
int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
unsigned long start, unsigned long end, gfp_t gfp,
bool ext);
/**
* idr_alloc - allocate an id
* @idr: idr handle
* @ptr: pointer to be associated with the new id
* @start: the minimum id (inclusive)
* @end: the maximum id (exclusive)
* @gfp: memory allocation flags
*
* Allocates an unused ID in the range [start, end). Returns -ENOSPC
* if there are no unused IDs in that range.
*
* Note that @end is treated as max when <= 0. This is to always allow
* using @start + N as @end as long as N is inside integer range.
*
* Simultaneous modifications to the @idr are not allowed and should be
* prevented by the user, usually with a lock. idr_alloc() may be called
* concurrently with read-only accesses to the @idr, such as idr_find() and
* idr_for_each_entry().
*/
static inline int idr_alloc(struct idr *idr, void *ptr,
int start, int end, gfp_t gfp)
{
unsigned long id;
int ret;
if (WARN_ON_ONCE(start < 0))
return -EINVAL;
ret = idr_alloc_cmn(idr, ptr, &id, start, end, gfp, false);
if (ret)
return ret;
return id;
}
static inline int idr_alloc_ext(struct idr *idr, void *ptr,
unsigned long *index,
unsigned long start,
unsigned long end,
gfp_t gfp)
{
return idr_alloc_cmn(idr, ptr, index, start, end, gfp, true);
}
int idr_alloc_cyclic(struct idr *, void *entry, int start, int end, gfp_t);
int idr_for_each(const struct idr *,
int (*fn)(int id, void *p, void *data), void *data);
void *idr_get_next(struct idr *, int *nextid);
void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);
void *idr_replace(struct idr *, void *, int id);
void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id);
void idr_destroy(struct idr *);
static inline void *idr_remove_ext(struct idr *idr, unsigned long id)
{
return radix_tree_delete_item(&idr->idr_rt, id, NULL);
}
static inline void *idr_remove(struct idr *idr, int id)
{
return radix_tree_delete_item(&idr->idr_rt, id, NULL);
return idr_remove_ext(idr, id);
}
static inline void idr_init(struct idr *idr)
@ -128,11 +184,16 @@ static inline void idr_preload_end(void)
* This function can be called under rcu_read_lock(), given that the leaf
* pointers lifetimes are correctly managed.
*/
static inline void *idr_find(const struct idr *idr, int id)
static inline void *idr_find_ext(const struct idr *idr, unsigned long id)
{
return radix_tree_lookup(&idr->idr_rt, id);
}
static inline void *idr_find(const struct idr *idr, int id)
{
return idr_find_ext(idr, id);
}
/**
* idr_for_each_entry - iterate over an idr's elements of a given type
* @idr: idr handle
@ -145,6 +206,8 @@ static inline void *idr_find(const struct idr *idr, int id)
*/
#define idr_for_each_entry(idr, entry, id) \
for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; ++id)
#define idr_for_each_entry_ext(idr, entry, id) \
for (id = 0; ((entry) = idr_get_next_ext(idr, &(id))) != NULL; ++id)
/**
* idr_for_each_entry_continue - continue iteration over an idr's elements of a given type

21
include/linux/radix-tree.h
View File

@ -357,8 +357,25 @@ int radix_tree_split(struct radix_tree_root *, unsigned long index,
unsigned new_order);
int radix_tree_join(struct radix_tree_root *, unsigned long index,
unsigned new_order, void *);
void __rcu **idr_get_free(struct radix_tree_root *, struct radix_tree_iter *,
gfp_t, int end);
void __rcu **idr_get_free_cmn(struct radix_tree_root *root,
struct radix_tree_iter *iter, gfp_t gfp,
unsigned long max);
static inline void __rcu **idr_get_free(struct radix_tree_root *root,
struct radix_tree_iter *iter,
gfp_t gfp,
int end)
{
return idr_get_free_cmn(root, iter, gfp, end > 0 ? end - 1 : INT_MAX);
}
static inline void __rcu **idr_get_free_ext(struct radix_tree_root *root,
struct radix_tree_iter *iter,
gfp_t gfp,
unsigned long end)
{
return idr_get_free_cmn(root, iter, gfp, end - 1);
}
enum {
RADIX_TREE_ITER_TAG_MASK = 0x0f, /* tag index in lower nybble */

66
lib/idr.c
View File

@ -7,45 +7,32 @@
DEFINE_PER_CPU(struct ida_bitmap *, ida_bitmap);
static DEFINE_SPINLOCK(simple_ida_lock);
/**
* idr_alloc - allocate an id
* @idr: idr handle
* @ptr: pointer to be associated with the new id
* @start: the minimum id (inclusive)
* @end: the maximum id (exclusive)
* @gfp: memory allocation flags
*
* Allocates an unused ID in the range [start, end). Returns -ENOSPC
* if there are no unused IDs in that range.
*
* Note that @end is treated as max when <= 0. This is to always allow
* using @start + N as @end as long as N is inside integer range.
*
* Simultaneous modifications to the @idr are not allowed and should be
* prevented by the user, usually with a lock. idr_alloc() may be called
* concurrently with read-only accesses to the @idr, such as idr_find() and
* idr_for_each_entry().
*/
int idr_alloc(struct idr *idr, void *ptr, int start, int end, gfp_t gfp)
int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
unsigned long start, unsigned long end, gfp_t gfp,
bool ext)
{
void __rcu **slot;
struct radix_tree_iter iter;
void __rcu **slot;
if (WARN_ON_ONCE(start < 0))
return -EINVAL;
if (WARN_ON_ONCE(radix_tree_is_internal_node(ptr)))
return -EINVAL;
radix_tree_iter_init(&iter, start);
slot = idr_get_free(&idr->idr_rt, &iter, gfp, end);
if (ext)
slot = idr_get_free_ext(&idr->idr_rt, &iter, gfp, end);
else
slot = idr_get_free(&idr->idr_rt, &iter, gfp, end);
if (IS_ERR(slot))
return PTR_ERR(slot);
radix_tree_iter_replace(&idr->idr_rt, &iter, slot, ptr);
radix_tree_iter_tag_clear(&idr->idr_rt, &iter, IDR_FREE);
return iter.index;
if (index)
*index = iter.index;
return 0;
}
EXPORT_SYMBOL_GPL(idr_alloc);
EXPORT_SYMBOL_GPL(idr_alloc_cmn);
/**
* idr_alloc_cyclic - allocate new idr entry in a cyclical fashion
@ -134,6 +121,20 @@ void *idr_get_next(struct idr *idr, int *nextid)
}
EXPORT_SYMBOL(idr_get_next);
void *idr_get_next_ext(struct idr *idr, unsigned long *nextid)
{
struct radix_tree_iter iter;
void __rcu **slot;
slot = radix_tree_iter_find(&idr->idr_rt, &iter, *nextid);
if (!slot)
return NULL;
*nextid = iter.index;
return rcu_dereference_raw(*slot);
}
EXPORT_SYMBOL(idr_get_next_ext);
/**
* idr_replace - replace pointer for given id
* @idr: idr handle
@ -149,13 +150,20 @@ EXPORT_SYMBOL(idr_get_next);
* %-EINVAL indicates that @id or @ptr were not valid.
*/
void *idr_replace(struct idr *idr, void *ptr, int id)
{
if (WARN_ON_ONCE(id < 0))
return ERR_PTR(-EINVAL);
return idr_replace_ext(idr, ptr, id);
}
EXPORT_SYMBOL(idr_replace);
void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id)
{
struct radix_tree_node *node;
void __rcu **slot = NULL;
void *entry;
if (WARN_ON_ONCE(id < 0))
return ERR_PTR(-EINVAL);
if (WARN_ON_ONCE(radix_tree_is_internal_node(ptr)))
return ERR_PTR(-EINVAL);
@ -167,7 +175,7 @@ void *idr_replace(struct idr *idr, void *ptr, int id)
return entry;
}
EXPORT_SYMBOL(idr_replace);
EXPORT_SYMBOL(idr_replace_ext);
/**
* DOC: IDA description

6
lib/radix-tree.c
View File

@ -2137,13 +2137,13 @@ int ida_pre_get(struct ida *ida, gfp_t gfp)
}
EXPORT_SYMBOL(ida_pre_get);
void __rcu **idr_get_free(struct radix_tree_root *root,
struct radix_tree_iter *iter, gfp_t gfp, int end)
void __rcu **idr_get_free_cmn(struct radix_tree_root *root,
struct radix_tree_iter *iter, gfp_t gfp,
unsigned long max)
{
struct radix_tree_node *node = NULL, *child;
void __rcu **slot = (void __rcu **)&root->rnode;
unsigned long maxindex, start = iter->next_index;
unsigned long max = end > 0 ? end - 1 : INT_MAX;
unsigned int shift, offset = 0;
grow: