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klist: fix coding style errors in klist.h and klist.c

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Finally clean up the odd spacing in these files.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2008-04-30 16:43:45 -07:00
parent c3b19ff06e
commit c3bb7fadaf
2 changed files with 100 additions and 136 deletions
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30
include/linux/klist.h
View File

@ -34,38 +34,38 @@ struct klist {
#define DEFINE_KLIST(_name, _get, _put) \ #define DEFINE_KLIST(_name, _get, _put) \
struct klist _name = KLIST_INIT(_name, _get, _put) struct klist _name = KLIST_INIT(_name, _get, _put)
extern void klist_init(struct klist * k, void (*get)(struct klist_node *), extern void klist_init(struct klist *k, void (*get)(struct klist_node *),
void (*put)(struct klist_node *)); void (*put)(struct klist_node *));
struct klist_node { struct klist_node {
struct klist * n_klist; struct klist *n_klist;
struct list_head n_node; struct list_head n_node;
struct kref n_ref; struct kref n_ref;
struct completion n_removed; struct completion n_removed;
}; };
extern void klist_add_tail(struct klist_node * n, struct klist * k); extern void klist_add_tail(struct klist_node *n, struct klist *k);
extern void klist_add_head(struct klist_node * n, struct klist * k); extern void klist_add_head(struct klist_node *n, struct klist *k);
extern void klist_add_after(struct klist_node *n, struct klist_node *pos); extern void klist_add_after(struct klist_node *n, struct klist_node *pos);
extern void klist_add_before(struct klist_node *n, struct klist_node *pos); extern void klist_add_before(struct klist_node *n, struct klist_node *pos);
extern void klist_del(struct klist_node * n); extern void klist_del(struct klist_node *n);
extern void klist_remove(struct klist_node * n); extern void klist_remove(struct klist_node *n);
extern int klist_node_attached(struct klist_node * n); extern int klist_node_attached(struct klist_node *n);
struct klist_iter { struct klist_iter {
struct klist * i_klist; struct klist *i_klist;
struct list_head * i_head; struct list_head *i_head;
struct klist_node * i_cur; struct klist_node *i_cur;
}; };
extern void klist_iter_init(struct klist * k, struct klist_iter * i); extern void klist_iter_init(struct klist *k, struct klist_iter *i);
extern void klist_iter_init_node(struct klist * k, struct klist_iter * i, extern void klist_iter_init_node(struct klist *k, struct klist_iter *i,
struct klist_node * n); struct klist_node *n);
extern void klist_iter_exit(struct klist_iter * i); extern void klist_iter_exit(struct klist_iter *i);
extern struct klist_node * klist_next(struct klist_iter * i); extern struct klist_node *klist_next(struct klist_iter *i);
#endif #endif

206
lib/klist.c
View File

@ -1,38 +1,37 @@
/* /*
* klist.c - Routines for manipulating klists. * klist.c - Routines for manipulating klists.
* *
* Copyright (C) 2005 Patrick Mochel
* *
* This klist interface provides a couple of structures that wrap around * This file is released under the GPL v2.
* struct list_head to provide explicit list "head" (struct klist) and
* list "node" (struct klist_node) objects. For struct klist, a spinlock
* is included that protects access to the actual list itself. struct
* klist_node provides a pointer to the klist that owns it and a kref
* reference count that indicates the number of current users of that node
* in the list.
* *
* The entire point is to provide an interface for iterating over a list * This klist interface provides a couple of structures that wrap around
* that is safe and allows for modification of the list during the * struct list_head to provide explicit list "head" (struct klist) and list
* iteration (e.g. insertion and removal), including modification of the * "node" (struct klist_node) objects. For struct klist, a spinlock is
* current node on the list. * included that protects access to the actual list itself. struct
* klist_node provides a pointer to the klist that owns it and a kref
* reference count that indicates the number of current users of that node
* in the list.
* *
* It works using a 3rd object type - struct klist_iter - that is declared * The entire point is to provide an interface for iterating over a list
* and initialized before an iteration. klist_next() is used to acquire the * that is safe and allows for modification of the list during the
* next element in the list. It returns NULL if there are no more items. * iteration (e.g. insertion and removal), including modification of the
* Internally, that routine takes the klist's lock, decrements the reference * current node on the list.
* count of the previous klist_node and increments the count of the next
* klist_node. It then drops the lock and returns.
* *
* There are primitives for adding and removing nodes to/from a klist. * It works using a 3rd object type - struct klist_iter - that is declared
* When deleting, klist_del() will simply decrement the reference count. * and initialized before an iteration. klist_next() is used to acquire the
* Only when the count goes to 0 is the node removed from the list. * next element in the list. It returns NULL if there are no more items.
* klist_remove() will try to delete the node from the list and block * Internally, that routine takes the klist's lock, decrements the
* until it is actually removed. This is useful for objects (like devices) * reference count of the previous klist_node and increments the count of
* that have been removed from the system and must be freed (but must wait * the next klist_node. It then drops the lock and returns.
* until all accessors have finished).
* *
* Copyright (C) 2005 Patrick Mochel * There are primitives for adding and removing nodes to/from a klist.
* * When deleting, klist_del() will simply decrement the reference count.
* This file is released under the GPL v2. * Only when the count goes to 0 is the node removed from the list.
* klist_remove() will try to delete the node from the list and block until
* it is actually removed. This is useful for objects (like devices) that
* have been removed from the system and must be freed (but must wait until
* all accessors have finished).
*/ */
#include <linux/klist.h> #include <linux/klist.h>
@ -40,10 +39,10 @@
/** /**
* klist_init - Initialize a klist structure. * klist_init - Initialize a klist structure.
* @k: The klist we're initializing. * @k: The klist we're initializing.
* @get: The get function for the embedding object (NULL if none) * @get: The get function for the embedding object (NULL if none)
* @put: The put function for the embedding object (NULL if none) * @put: The put function for the embedding object (NULL if none)
* *
* Initialises the klist structure. If the klist_node structures are * Initialises the klist structure. If the klist_node structures are
* going to be embedded in refcounted objects (necessary for safe * going to be embedded in refcounted objects (necessary for safe
@ -51,8 +50,7 @@
* functions that take and release references on the embedding * functions that take and release references on the embedding
* objects. * objects.
*/ */
void klist_init(struct klist *k, void (*get)(struct klist_node *),
void klist_init(struct klist * k, void (*get)(struct klist_node *),
void (*put)(struct klist_node *)) void (*put)(struct klist_node *))
{ {
INIT_LIST_HEAD(&k->k_list); INIT_LIST_HEAD(&k->k_list);
@ -60,26 +58,23 @@ void klist_init(struct klist * k, void (*get)(struct klist_node *),
k->get = get; k->get = get;
k->put = put; k->put = put;
} }
EXPORT_SYMBOL_GPL(klist_init); EXPORT_SYMBOL_GPL(klist_init);
static void add_head(struct klist *k, struct klist_node *n)
static void add_head(struct klist * k, struct klist_node * n)
{ {
spin_lock(&k->k_lock); spin_lock(&k->k_lock);
list_add(&n->n_node, &k->k_list); list_add(&n->n_node, &k->k_list);
spin_unlock(&k->k_lock); spin_unlock(&k->k_lock);
} }
static void add_tail(struct klist * k, struct klist_node * n) static void add_tail(struct klist *k, struct klist_node *n)
{ {
spin_lock(&k->k_lock); spin_lock(&k->k_lock);
list_add_tail(&n->n_node, &k->k_list); list_add_tail(&n->n_node, &k->k_list);
spin_unlock(&k->k_lock); spin_unlock(&k->k_lock);
} }
static void klist_node_init(struct klist *k, struct klist_node *n)
static void klist_node_init(struct klist * k, struct klist_node * n)
{ {
INIT_LIST_HEAD(&n->n_node); INIT_LIST_HEAD(&n->n_node);
init_completion(&n->n_removed); init_completion(&n->n_removed);
@ -89,37 +84,30 @@ static void klist_node_init(struct klist * k, struct klist_node * n)
k->get(n); k->get(n);
} }
/** /**
* klist_add_head - Initialize a klist_node and add it to front. * klist_add_head - Initialize a klist_node and add it to front.
* @n: node we're adding. * @n: node we're adding.
* @k: klist it's going on. * @k: klist it's going on.
*/ */
void klist_add_head(struct klist_node *n, struct klist *k)
void klist_add_head(struct klist_node * n, struct klist * k)
{ {
klist_node_init(k, n); klist_node_init(k, n);
add_head(k, n); add_head(k, n);
} }
EXPORT_SYMBOL_GPL(klist_add_head); EXPORT_SYMBOL_GPL(klist_add_head);
/** /**
* klist_add_tail - Initialize a klist_node and add it to back. * klist_add_tail - Initialize a klist_node and add it to back.
* @n: node we're adding. * @n: node we're adding.
* @k: klist it's going on. * @k: klist it's going on.
*/ */
void klist_add_tail(struct klist_node *n, struct klist *k)
void klist_add_tail(struct klist_node * n, struct klist * k)
{ {
klist_node_init(k, n); klist_node_init(k, n);
add_tail(k, n); add_tail(k, n);
} }
EXPORT_SYMBOL_GPL(klist_add_tail); EXPORT_SYMBOL_GPL(klist_add_tail);
/** /**
* klist_add_after - Init a klist_node and add it after an existing node * klist_add_after - Init a klist_node and add it after an existing node
* @n: node we're adding. * @n: node we're adding.
@ -152,30 +140,27 @@ void klist_add_before(struct klist_node *n, struct klist_node *pos)
} }
EXPORT_SYMBOL_GPL(klist_add_before); EXPORT_SYMBOL_GPL(klist_add_before);
static void klist_release(struct kref *kref)
static void klist_release(struct kref * kref)
{ {
struct klist_node * n = container_of(kref, struct klist_node, n_ref); struct klist_node *n = container_of(kref, struct klist_node, n_ref);
list_del(&n->n_node); list_del(&n->n_node);
complete(&n->n_removed); complete(&n->n_removed);
n->n_klist = NULL; n->n_klist = NULL;
} }
static int klist_dec_and_del(struct klist_node * n) static int klist_dec_and_del(struct klist_node *n)
{ {
return kref_put(&n->n_ref, klist_release); return kref_put(&n->n_ref, klist_release);
} }
/** /**
* klist_del - Decrement the reference count of node and try to remove. * klist_del - Decrement the reference count of node and try to remove.
* @n: node we're deleting. * @n: node we're deleting.
*/ */
void klist_del(struct klist_node *n)
void klist_del(struct klist_node * n)
{ {
struct klist * k = n->n_klist; struct klist *k = n->n_klist;
void (*put)(struct klist_node *) = k->put; void (*put)(struct klist_node *) = k->put;
spin_lock(&k->k_lock); spin_lock(&k->k_lock);
@ -185,48 +170,40 @@ void klist_del(struct klist_node * n)
if (put) if (put)
put(n); put(n);
} }
EXPORT_SYMBOL_GPL(klist_del); EXPORT_SYMBOL_GPL(klist_del);
/** /**
* klist_remove - Decrement the refcount of node and wait for it to go away. * klist_remove - Decrement the refcount of node and wait for it to go away.
* @n: node we're removing. * @n: node we're removing.
*/ */
void klist_remove(struct klist_node *n)
void klist_remove(struct klist_node * n)
{ {
klist_del(n); klist_del(n);
wait_for_completion(&n->n_removed); wait_for_completion(&n->n_removed);
} }
EXPORT_SYMBOL_GPL(klist_remove); EXPORT_SYMBOL_GPL(klist_remove);
/** /**
* klist_node_attached - Say whether a node is bound to a list or not. * klist_node_attached - Say whether a node is bound to a list or not.
* @n: Node that we're testing. * @n: Node that we're testing.
*/ */
int klist_node_attached(struct klist_node *n)
int klist_node_attached(struct klist_node * n)
{ {
return (n->n_klist != NULL); return (n->n_klist != NULL);
} }
EXPORT_SYMBOL_GPL(klist_node_attached); EXPORT_SYMBOL_GPL(klist_node_attached);
/** /**
* klist_iter_init_node - Initialize a klist_iter structure. * klist_iter_init_node - Initialize a klist_iter structure.
* @k: klist we're iterating. * @k: klist we're iterating.
* @i: klist_iter we're filling. * @i: klist_iter we're filling.
* @n: node to start with. * @n: node to start with.
* *
* Similar to klist_iter_init(), but starts the action off with @n, * Similar to klist_iter_init(), but starts the action off with @n,
* instead of with the list head. * instead of with the list head.
*/ */
void klist_iter_init_node(struct klist *k, struct klist_iter *i,
void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_node * n) struct klist_node *n)
{ {
i->i_klist = k; i->i_klist = k;
i->i_head = &k->k_list; i->i_head = &k->k_list;
@ -234,66 +211,56 @@ void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_
if (n) if (n)
kref_get(&n->n_ref); kref_get(&n->n_ref);
} }
EXPORT_SYMBOL_GPL(klist_iter_init_node); EXPORT_SYMBOL_GPL(klist_iter_init_node);
/** /**
* klist_iter_init - Iniitalize a klist_iter structure. * klist_iter_init - Iniitalize a klist_iter structure.
* @k: klist we're iterating. * @k: klist we're iterating.
* @i: klist_iter structure we're filling. * @i: klist_iter structure we're filling.
* *
* Similar to klist_iter_init_node(), but start with the list head. * Similar to klist_iter_init_node(), but start with the list head.
*/ */
void klist_iter_init(struct klist *k, struct klist_iter *i)
void klist_iter_init(struct klist * k, struct klist_iter * i)
{ {
klist_iter_init_node(k, i, NULL); klist_iter_init_node(k, i, NULL);
} }
EXPORT_SYMBOL_GPL(klist_iter_init); EXPORT_SYMBOL_GPL(klist_iter_init);
/** /**
* klist_iter_exit - Finish a list iteration. * klist_iter_exit - Finish a list iteration.
* @i: Iterator structure. * @i: Iterator structure.
* *
* Must be called when done iterating over list, as it decrements the * Must be called when done iterating over list, as it decrements the
* refcount of the current node. Necessary in case iteration exited before * refcount of the current node. Necessary in case iteration exited before
* the end of the list was reached, and always good form. * the end of the list was reached, and always good form.
*/ */
void klist_iter_exit(struct klist_iter *i)
void klist_iter_exit(struct klist_iter * i)
{ {
if (i->i_cur) { if (i->i_cur) {
klist_del(i->i_cur); klist_del(i->i_cur);
i->i_cur = NULL; i->i_cur = NULL;
} }
} }
EXPORT_SYMBOL_GPL(klist_iter_exit); EXPORT_SYMBOL_GPL(klist_iter_exit);
static struct klist_node *to_klist_node(struct list_head *n)
static struct klist_node * to_klist_node(struct list_head * n)
{ {
return container_of(n, struct klist_node, n_node); return container_of(n, struct klist_node, n_node);
} }
/** /**
* klist_next - Ante up next node in list. * klist_next - Ante up next node in list.
* @i: Iterator structure. * @i: Iterator structure.
* *
* First grab list lock. Decrement the reference count of the previous * First grab list lock. Decrement the reference count of the previous
* node, if there was one. Grab the next node, increment its reference * node, if there was one. Grab the next node, increment its reference
* count, drop the lock, and return that next node. * count, drop the lock, and return that next node.
*/ */
struct klist_node *klist_next(struct klist_iter *i)
struct klist_node * klist_next(struct klist_iter * i)
{ {
struct list_head * next; struct list_head *next;
struct klist_node * lnode = i->i_cur; struct klist_node *lnode = i->i_cur;
struct klist_node * knode = NULL; struct klist_node *knode = NULL;
void (*put)(struct klist_node *) = i->i_klist->put; void (*put)(struct klist_node *) = i->i_klist->put;
spin_lock(&i->i_klist->k_lock); spin_lock(&i->i_klist->k_lock);
@ -314,7 +281,4 @@ struct klist_node * klist_next(struct klist_iter * i)
put(lnode); put(lnode);
return knode; return knode;
} }
EXPORT_SYMBOL_GPL(klist_next); EXPORT_SYMBOL_GPL(klist_next);