cregit-Linux how code gets into the kernel

Release 4.17 lib/klist.c

Directory: lib
/*
 * klist.c - Routines for manipulating klists.
 *
 * Copyright (C) 2005 Patrick Mochel
 *
 * This file is released under the GPL v2.
 *
 * This klist interface provides a couple of structures that wrap around
 * 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
 * that is safe and allows for modification of the list during the
 * iteration (e.g. insertion and removal), including modification of the
 * current node on the list.
 *
 * It works using a 3rd object type - struct klist_iter - that is declared
 * and initialized before an iteration. klist_next() is used to acquire the
 * next element in the list. It returns NULL if there are no more items.
 * Internally, that routine takes the klist's lock, decrements the
 * reference 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.
 * When deleting, klist_del() will simply decrement the reference count.
 * 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/export.h>
#include <linux/sched.h>

/*
 * Use the lowest bit of n_klist to mark deleted nodes and exclude
 * dead ones from iteration.
 */

#define KNODE_DEAD		1LU

#define KNODE_KLIST_MASK	~KNODE_DEAD


static struct klist *knode_klist(struct klist_node *knode) { return (struct klist *) ((unsigned long)knode->n_klist & KNODE_KLIST_MASK); }

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static bool knode_dead(struct klist_node *knode) { return (unsigned long)knode->n_klist & KNODE_DEAD; }

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static void knode_set_klist(struct klist_node *knode, struct klist *klist) { knode->n_klist = klist; /* no knode deserves to start its life dead */ WARN_ON(knode_dead(knode)); }

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static void knode_kill(struct klist_node *knode) { /* and no knode should die twice ever either, see we're very humane */ WARN_ON(knode_dead(knode)); *(unsigned long *)&knode->n_klist |= KNODE_DEAD; }

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/** * klist_init - Initialize a klist structure. * @k: The klist we're initializing. * @get: The get 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 * going to be embedded in refcounted objects (necessary for safe * deletion) then the get/put arguments are used to initialise * functions that take and release references on the embedding * objects. */
void klist_init(struct klist *k, void (*get)(struct klist_node *), void (*put)(struct klist_node *)) { INIT_LIST_HEAD(&k->k_list); spin_lock_init(&k->k_lock); k->get = get; k->put = put; }

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Patrick Mochel2643.33%150.00%
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EXPORT_SYMBOL_GPL(klist_init);
static void add_head(struct klist *k, struct klist_node *n) { spin_lock(&k->k_lock); list_add(&n->n_node, &k->k_list); spin_unlock(&k->k_lock); }

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static void add_tail(struct klist *k, struct klist_node *n) { spin_lock(&k->k_lock); list_add_tail(&n->n_node, &k->k_list); spin_unlock(&k->k_lock); }

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static void klist_node_init(struct klist *k, struct klist_node *n) { INIT_LIST_HEAD(&n->n_node); kref_init(&n->n_ref); knode_set_klist(n, k); if (k->get) k->get(n); }

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Patrick Mochel3567.31%133.33%
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Tejun Heo47.69%133.33%
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/** * klist_add_head - Initialize a klist_node and add it to front. * @n: node we're adding. * @k: klist it's going on. */
void klist_add_head(struct klist_node *n, struct klist *k) { klist_node_init(k, n); add_head(k, n); }

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Patrick Mochel2586.21%150.00%
James Bottomley413.79%150.00%
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EXPORT_SYMBOL_GPL(klist_add_head); /** * klist_add_tail - Initialize a klist_node and add it to back. * @n: node we're adding. * @k: klist it's going on. */
void klist_add_tail(struct klist_node *n, struct klist *k) { klist_node_init(k, n); add_tail(k, n); }

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Patrick Mochel2586.21%150.00%
James Bottomley413.79%150.00%
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EXPORT_SYMBOL_GPL(klist_add_tail); /** * klist_add_behind - Init a klist_node and add it after an existing node * @n: node we're adding. * @pos: node to put @n after */
void klist_add_behind(struct klist_node *n, struct klist_node *pos) { struct klist *k = knode_klist(pos); klist_node_init(k, n); spin_lock(&k->k_lock); list_add(&n->n_node, &pos->n_node); spin_unlock(&k->k_lock); }

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Ken Helias11.64%133.33%
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EXPORT_SYMBOL_GPL(klist_add_behind); /** * klist_add_before - Init a klist_node and add it before an existing node * @n: node we're adding. * @pos: node to put @n after */
void klist_add_before(struct klist_node *n, struct klist_node *pos) { struct klist *k = knode_klist(pos); klist_node_init(k, n); spin_lock(&k->k_lock); list_add_tail(&n->n_node, &pos->n_node); spin_unlock(&k->k_lock); }

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EXPORT_SYMBOL_GPL(klist_add_before); struct klist_waiter { struct list_head list; struct klist_node *node; struct task_struct *process; int woken; }; static DEFINE_SPINLOCK(klist_remove_lock); static LIST_HEAD(klist_remove_waiters);
static void klist_release(struct kref *kref) { struct klist_waiter *waiter, *tmp; struct klist_node *n = container_of(kref, struct klist_node, n_ref); WARN_ON(!knode_dead(n)); list_del(&n->n_node); spin_lock(&klist_remove_lock); list_for_each_entry_safe(waiter, tmp, &klist_remove_waiters, list) { if (waiter->node != n) continue; list_del(&waiter->list); waiter->woken = 1; mb(); wake_up_process(waiter->process); } spin_unlock(&klist_remove_lock); knode_set_klist(n, NULL); }

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Wang Biao86.96%120.00%
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static int klist_dec_and_del(struct klist_node *n) { return kref_put(&n->n_ref, klist_release); }

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static void klist_put(struct klist_node *n, bool kill) { struct klist *k = knode_klist(n); void (*put)(struct klist_node *) = k->put; spin_lock(&k->k_lock); if (kill) knode_kill(n); if (!klist_dec_and_del(n)) put = NULL; spin_unlock(&k->k_lock); if (put) put(n); }

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Patrick Mochel3743.53%133.33%
Alan Stern3136.47%133.33%
Tejun Heo1720.00%133.33%
Total85100.00%3100.00%

/** * klist_del - Decrement the reference count of node and try to remove. * @n: node we're deleting. */
void klist_del(struct klist_node *n) { klist_put(n, true); }

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EXPORT_SYMBOL_GPL(klist_del); /** * klist_remove - Decrement the refcount of node and wait for it to go away. * @n: node we're removing. */
void klist_remove(struct klist_node *n) { struct klist_waiter waiter; waiter.node = n; waiter.process = current; waiter.woken = 0; spin_lock(&klist_remove_lock); list_add(&waiter.list, &klist_remove_waiters); spin_unlock(&klist_remove_lock); klist_del(n); for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (waiter.woken) break; schedule(); } __set_current_state(TASK_RUNNING); }

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EXPORT_SYMBOL_GPL(klist_remove); /** * klist_node_attached - Say whether a node is bound to a list or not. * @n: Node that we're testing. */
int klist_node_attached(struct klist_node *n) { return (n->n_klist != NULL); }

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EXPORT_SYMBOL_GPL(klist_node_attached); /** * klist_iter_init_node - Initialize a klist_iter structure. * @k: klist we're iterating. * @i: klist_iter we're filling. * @n: node to start with. * * Similar to klist_iter_init(), but starts the action off with @n, * instead of with the list head. */
void klist_iter_init_node(struct klist *k, struct klist_iter *i, struct klist_node *n) { i->i_klist = k; i->i_cur = NULL; if (n && kref_get_unless_zero(&n->n_ref)) i->i_cur = n; }

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EXPORT_SYMBOL_GPL(klist_iter_init_node); /** * klist_iter_init - Iniitalize a klist_iter structure. * @k: klist we're iterating. * @i: klist_iter structure we're filling. * * Similar to klist_iter_init_node(), but start with the list head. */
void klist_iter_init(struct klist *k, struct klist_iter *i) { klist_iter_init_node(k, i, NULL); }

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EXPORT_SYMBOL_GPL(klist_iter_init); /** * klist_iter_exit - Finish a list iteration. * @i: Iterator structure. * * Must be called when done iterating over list, as it decrements the * refcount of the current node. Necessary in case iteration exited before * the end of the list was reached, and always good form. */
void klist_iter_exit(struct klist_iter *i) { if (i->i_cur) { klist_put(i->i_cur, false); i->i_cur = NULL; } }

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EXPORT_SYMBOL_GPL(klist_iter_exit);
static struct klist_node *to_klist_node(struct list_head *n) { return container_of(n, struct klist_node, n_node); }

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Patrick Mochel24100.00%1100.00%
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/** * klist_prev - Ante up prev node in list. * @i: Iterator structure. * * First grab list lock. Decrement the reference count of the previous * node, if there was one. Grab the prev node, increment its reference * count, drop the lock, and return that prev node. */
struct klist_node *klist_prev(struct klist_iter *i) { void (*put)(struct klist_node *) = i->i_klist->put; struct klist_node *last = i->i_cur; struct klist_node *prev; spin_lock(&i->i_klist->k_lock); if (last) { prev = to_klist_node(last->n_node.prev); if (!klist_dec_and_del(last)) put = NULL; } else prev = to_klist_node(i->i_klist->k_list.prev); i->i_cur = NULL; while (prev != to_klist_node(&i->i_klist->k_list)) { if (likely(!knode_dead(prev))) { kref_get(&prev->n_ref); i->i_cur = prev; break; } prev = to_klist_node(prev->n_node.prev); } spin_unlock(&i->i_klist->k_lock); if (put && last) put(last); return i->i_cur; }

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EXPORT_SYMBOL_GPL(klist_prev); /** * klist_next - Ante up next node in list. * @i: Iterator structure. * * First grab list lock. Decrement the reference count of the previous * node, if there was one. Grab the next node, increment its reference * count, drop the lock, and return that next node. */
struct klist_node *klist_next(struct klist_iter *i) { void (*put)(struct klist_node *) = i->i_klist->put; struct klist_node *last = i->i_cur; struct klist_node *next; spin_lock(&i->i_klist->k_lock); if (last) { next = to_klist_node(last->n_node.next); if (!klist_dec_and_del(last)) put = NULL; } else next = to_klist_node(i->i_klist->k_list.next); i->i_cur = NULL; while (next != to_klist_node(&i->i_klist->k_list)) { if (likely(!knode_dead(next))) { kref_get(&next->n_ref); i->i_cur = next; break; } next = to_klist_node(next->n_node.next); } spin_unlock(&i->i_klist->k_lock); if (put && last) put(last); return i->i_cur; }

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Alan Stern3318.03%133.33%
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EXPORT_SYMBOL_GPL(klist_next);

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Andy Shevchenko18912.84%16.67%
Matthew Wilcox15710.67%16.67%
Alan Stern644.35%16.67%
James Bottomley644.35%320.00%
Greg Kroah-Hartman100.68%16.67%
Frank Pavlic100.68%16.67%
Wang Biao80.54%16.67%
Ken Helias30.20%16.67%
Paul Gortmaker10.07%16.67%
Total1472100.00%15100.00%
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