cregit-Linux how code gets into the kernel

Release 4.11 net/sunrpc/cache.c

Directory: net/sunrpc
/*
 * net/sunrpc/cache.c
 *
 * Generic code for various authentication-related caches
 * used by sunrpc clients and servers.
 *
 * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
 *
 * Released under terms in GPL version 2.  See COPYING.
 *
 */

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kmod.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/string_helpers.h>
#include <linux/uaccess.h>
#include <linux/poll.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/net.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/pagemap.h>
#include <asm/ioctls.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/cache.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include "netns.h"


#define	 RPCDBG_FACILITY RPCDBG_CACHE

static bool cache_defer_req(struct cache_req *req, struct cache_head *item);
static void cache_revisit_request(struct cache_head *item);


static void cache_init(struct cache_head *h, struct cache_detail *detail) { time_t now = seconds_since_boot(); INIT_HLIST_NODE(&h->cache_list); h->flags = 0; kref_init(&h->ref); h->expiry_time = now + CACHE_NEW_EXPIRY; if (now <= detail->flush_time) /* ensure it isn't already expired */ now = detail->flush_time + 1; h->last_refresh = now; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown6890.67%457.14%
Kinglong Mee56.67%114.29%
Andi Kleen11.33%114.29%
Adrian Bunk11.33%114.29%
Total75100.00%7100.00%


struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail, struct cache_head *key, int hash) { struct cache_head *new = NULL, *freeme = NULL, *tmp = NULL; struct hlist_head *head; head = &detail->hash_table[hash]; read_lock(&detail->hash_lock); hlist_for_each_entry(tmp, head, cache_list) { if (detail->match(tmp, key)) { if (cache_is_expired(detail, tmp)) /* This entry is expired, we will discard it. */ break; cache_get(tmp); read_unlock(&detail->hash_lock); return tmp; } } read_unlock(&detail->hash_lock); /* Didn't find anything, insert an empty entry */ new = detail->alloc(); if (!new) return NULL; /* must fully initialise 'new', else * we might get lose if we need to * cache_put it soon. */ cache_init(new, detail); detail->init(new, key); write_lock(&detail->hash_lock); /* check if entry appeared while we slept */ hlist_for_each_entry(tmp, head, cache_list) { if (detail->match(tmp, key)) { if (cache_is_expired(detail, tmp)) { hlist_del_init(&tmp->cache_list); detail->entries --; freeme = tmp; break; } cache_get(tmp); write_unlock(&detail->hash_lock); cache_put(new, detail); return tmp; } } hlist_add_head(&new->cache_list, head); detail->entries++; cache_get(new); write_unlock(&detail->hash_lock); if (freeme) cache_put(freeme, detail); return new; }

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Neil Brown24086.64%480.00%
Kinglong Mee3713.36%120.00%
Total277100.00%5100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_lookup); static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch);
static void cache_fresh_locked(struct cache_head *head, time_t expiry, struct cache_detail *detail) { time_t now = seconds_since_boot(); if (now <= detail->flush_time) /* ensure it isn't immediately treated as expired */ now = detail->flush_time + 1; head->expiry_time = expiry; head->last_refresh = now; smp_wmb(); /* paired with smp_rmb() in cache_is_valid() */ set_bit(CACHE_VALID, &head->flags); }

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PersonTokensPropCommitsCommitProp
Neil Brown6494.12%375.00%
J. Bruce Fields45.88%125.00%
Total68100.00%4100.00%


static void cache_fresh_unlocked(struct cache_head *head, struct cache_detail *detail) { if (test_and_clear_bit(CACHE_PENDING, &head->flags)) { cache_revisit_request(head); cache_dequeue(detail, head); } }

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Neil Brown42100.00%2100.00%
Total42100.00%2100.00%


struct cache_head *sunrpc_cache_update(struct cache_detail *detail, struct cache_head *new, struct cache_head *old, int hash) { /* The 'old' entry is to be replaced by 'new'. * If 'old' is not VALID, we update it directly, * otherwise we need to replace it */ struct cache_head *tmp; if (!test_bit(CACHE_VALID, &old->flags)) { write_lock(&detail->hash_lock); if (!test_bit(CACHE_VALID, &old->flags)) { if (test_bit(CACHE_NEGATIVE, &new->flags)) set_bit(CACHE_NEGATIVE, &old->flags); else detail->update(old, new); cache_fresh_locked(old, new->expiry_time, detail); write_unlock(&detail->hash_lock); cache_fresh_unlocked(old, detail); return old; } write_unlock(&detail->hash_lock); } /* We need to insert a new entry */ tmp = detail->alloc(); if (!tmp) { cache_put(old, detail); return NULL; } cache_init(tmp, detail); detail->init(tmp, old); write_lock(&detail->hash_lock); if (test_bit(CACHE_NEGATIVE, &new->flags)) set_bit(CACHE_NEGATIVE, &tmp->flags); else detail->update(tmp, new); hlist_add_head(&tmp->cache_list, &detail->hash_table[hash]); detail->entries++; cache_get(tmp); cache_fresh_locked(tmp, new->expiry_time, detail); cache_fresh_locked(old, 0, detail); write_unlock(&detail->hash_lock); cache_fresh_unlocked(tmp, detail); cache_fresh_unlocked(old, detail); cache_put(old, detail); return tmp; }

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PersonTokensPropCommitsCommitProp
Neil Brown28495.62%480.00%
Kinglong Mee134.38%120.00%
Total297100.00%5100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_update);
static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h) { if (cd->cache_upcall) return cd->cache_upcall(cd, h); return sunrpc_cache_pipe_upcall(cd, h); }

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PersonTokensPropCommitsCommitProp
Trond Myklebust1947.50%133.33%
Neil Brown1332.50%133.33%
Stanislav Kinsbursky820.00%133.33%
Total40100.00%3100.00%


static inline int cache_is_valid(struct cache_head *h) { if (!test_bit(CACHE_VALID, &h->flags)) return -EAGAIN; else { /* entry is valid */ if (test_bit(CACHE_NEGATIVE, &h->flags)) return -ENOENT; else { /* * In combination with write barrier in * sunrpc_cache_update, ensures that anyone * using the cache entry after this sees the * updated contents: */ smp_rmb(); return 0; } } }

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PersonTokensPropCommitsCommitProp
Neil Brown5389.83%266.67%
J. Bruce Fields610.17%133.33%
Total59100.00%3100.00%


static int try_to_negate_entry(struct cache_detail *detail, struct cache_head *h) { int rv; write_lock(&detail->hash_lock); rv = cache_is_valid(h); if (rv == -EAGAIN) { set_bit(CACHE_NEGATIVE, &h->flags); cache_fresh_locked(h, seconds_since_boot()+CACHE_NEW_EXPIRY, detail); rv = -ENOENT; } write_unlock(&detail->hash_lock); cache_fresh_unlocked(h, detail); return rv; }

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PersonTokensPropCommitsCommitProp
J. Bruce Fields7888.64%133.33%
Neil Brown1011.36%266.67%
Total88100.00%3100.00%

/* * This is the generic cache management routine for all * the authentication caches. * It checks the currency of a cache item and will (later) * initiate an upcall to fill it if needed. * * * Returns 0 if the cache_head can be used, or cache_puts it and returns * -EAGAIN if upcall is pending and request has been queued * -ETIMEDOUT if upcall failed or request could not be queue or * upcall completed but item is still invalid (implying that * the cache item has been replaced with a newer one). * -ENOENT if cache entry was negative */
int cache_check(struct cache_detail *detail, struct cache_head *h, struct cache_req *rqstp) { int rv; long refresh_age, age; /* First decide return status as best we can */ rv = cache_is_valid(h); /* now see if we want to start an upcall */ refresh_age = (h->expiry_time - h->last_refresh); age = seconds_since_boot() - h->last_refresh; if (rqstp == NULL) { if (rv == -EAGAIN) rv = -ENOENT; } else if (rv == -EAGAIN || (h->expiry_time != 0 && age > refresh_age/2)) { dprintk("RPC: Want update, refage=%ld, age=%ld\n", refresh_age, age); if (!test_and_set_bit(CACHE_PENDING, &h->flags)) { switch (cache_make_upcall(detail, h)) { case -EINVAL: rv = try_to_negate_entry(detail, h); break; case -EAGAIN: cache_fresh_unlocked(h, detail); break; } } } if (rv == -EAGAIN) { if (!cache_defer_req(rqstp, h)) { /* * Request was not deferred; handle it as best * we can ourselves: */ rv = cache_is_valid(h); if (rv == -EAGAIN) rv = -ETIMEDOUT; } } if (rv) cache_put(h, detail); return rv; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown20594.04%861.54%
J. Bruce Fields115.05%323.08%
Andi Kleen10.46%17.69%
Chuck Lever10.46%17.69%
Total218100.00%13100.00%

EXPORT_SYMBOL_GPL(cache_check); /* * caches need to be periodically cleaned. * For this we maintain a list of cache_detail and * a current pointer into that list and into the table * for that entry. * * Each time cache_clean is called it finds the next non-empty entry * in the current table and walks the list in that entry * looking for entries that can be removed. * * An entry gets removed if: * - The expiry is before current time * - The last_refresh time is before the flush_time for that cache * * later we might drop old entries with non-NEVER expiry if that table * is getting 'full' for some definition of 'full' * * The question of "how often to scan a table" is an interesting one * and is answered in part by the use of the "nextcheck" field in the * cache_detail. * When a scan of a table begins, the nextcheck field is set to a time * that is well into the future. * While scanning, if an expiry time is found that is earlier than the * current nextcheck time, nextcheck is set to that expiry time. * If the flush_time is ever set to a time earlier than the nextcheck * time, the nextcheck time is then set to that flush_time. * * A table is then only scanned if the current time is at least * the nextcheck time. * */ static LIST_HEAD(cache_list); static DEFINE_SPINLOCK(cache_list_lock); static struct cache_detail *current_detail; static int current_index; static void do_cache_clean(struct work_struct *work); static struct delayed_work cache_cleaner;
void sunrpc_init_cache_detail(struct cache_detail *cd) { rwlock_init(&cd->hash_lock); INIT_LIST_HEAD(&cd->queue); spin_lock(&cache_list_lock); cd->nextcheck = 0; cd->entries = 0; atomic_set(&cd->readers, 0); cd->last_close = 0; cd->last_warn = -1; list_add(&cd->others, &cache_list); spin_unlock(&cache_list_lock); /* start the cleaning process */ queue_delayed_work(system_power_efficient_wq, &cache_cleaner, 0); }

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PersonTokensPropCommitsCommitProp
Trond Myklebust5557.89%120.00%
J. Bruce Fields2526.32%120.00%
Neil Brown1212.63%240.00%
Ke Wang33.16%120.00%
Total95100.00%5100.00%

EXPORT_SYMBOL_GPL(sunrpc_init_cache_detail);
void sunrpc_destroy_cache_detail(struct cache_detail *cd) { cache_purge(cd); spin_lock(&cache_list_lock); write_lock(&cd->hash_lock); if (current_detail == cd) current_detail = NULL; list_del_init(&cd->others); write_unlock(&cd->hash_lock); spin_unlock(&cache_list_lock); if (list_empty(&cache_list)) { /* module must be being unloaded so its safe to kill the worker */ cancel_delayed_work_sync(&cache_cleaner); } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown4355.13%545.45%
J. Bruce Fields1620.51%19.09%
Trond Myklebust1215.38%218.18%
Wang Chen33.85%19.09%
Andrew Morton33.85%19.09%
Denis V. Lunev11.28%19.09%
Total78100.00%11100.00%

EXPORT_SYMBOL_GPL(sunrpc_destroy_cache_detail); /* clean cache tries to find something to clean * and cleans it. * It returns 1 if it cleaned something, * 0 if it didn't find anything this time * -1 if it fell off the end of the list. */
static int cache_clean(void) { int rv = 0; struct list_head *next; spin_lock(&cache_list_lock); /* find a suitable table if we don't already have one */ while (current_detail == NULL || current_index >= current_detail->hash_size) { if (current_detail) next = current_detail->others.next; else next = cache_list.next; if (next == &cache_list) { current_detail = NULL; spin_unlock(&cache_list_lock); return -1; } current_detail = list_entry(next, struct cache_detail, others); if (current_detail->nextcheck > seconds_since_boot()) current_index = current_detail->hash_size; else { current_index = 0; current_detail->nextcheck = seconds_since_boot()+30*60; } } /* find a non-empty bucket in the table */ while (current_detail && current_index < current_detail->hash_size && hlist_empty(&current_detail->hash_table[current_index])) current_index++; /* find a cleanable entry in the bucket and clean it, or set to next bucket */ if (current_detail && current_index < current_detail->hash_size) { struct cache_head *ch = NULL; struct cache_detail *d; struct hlist_head *head; struct hlist_node *tmp; write_lock(&current_detail->hash_lock); /* Ok, now to clean this strand */ head = &current_detail->hash_table[current_index]; hlist_for_each_entry_safe(ch, tmp, head, cache_list) { if (current_detail->nextcheck > ch->expiry_time) current_detail->nextcheck = ch->expiry_time+1; if (!cache_is_expired(current_detail, ch)) continue; hlist_del_init(&ch->cache_list); current_detail->entries--; rv = 1; break; } write_unlock(&current_detail->hash_lock); d = current_detail; if (!ch) current_index ++; spin_unlock(&cache_list_lock); if (ch) { set_bit(CACHE_CLEANED, &ch->flags); cache_fresh_unlocked(ch, d); cache_put(ch, d); } } else spin_unlock(&cache_list_lock); return rv; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown24272.89%1047.62%
Kinglong Mee329.64%14.76%
Andrew Morton298.73%314.29%
J. Bruce Fields236.93%419.05%
Trond Myklebust41.20%29.52%
Andi Kleen20.60%14.76%
Total332100.00%21100.00%

/* * We want to regularly clean the cache, so we need to schedule some work ... */
static void do_cache_clean(struct work_struct *work) { int delay = 5; if (cache_clean() == -1) delay = round_jiffies_relative(30*HZ); if (list_empty(&cache_list)) delay = 0; if (delay) queue_delayed_work(system_power_efficient_wq, &cache_cleaner, delay); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown4983.05%233.33%
Ke Wang35.08%116.67%
David Howells35.08%116.67%
Anton Blanchard35.08%116.67%
Adrian Bunk11.69%116.67%
Total59100.00%6100.00%

/* * Clean all caches promptly. This just calls cache_clean * repeatedly until we are sure that every cache has had a chance to * be fully cleaned */
void cache_flush(void) { while (cache_clean() != -1) cond_resched(); while (cache_clean() != -1) cond_resched(); }

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PersonTokensPropCommitsCommitProp
Neil Brown29100.00%1100.00%
Total29100.00%1100.00%

EXPORT_SYMBOL_GPL(cache_flush);
void cache_purge(struct cache_detail *detail) { struct cache_head *ch = NULL; struct hlist_head *head = NULL; struct hlist_node *tmp = NULL; int i = 0; write_lock(&detail->hash_lock); if (!detail->entries) { write_unlock(&detail->hash_lock); return; } dprintk("RPC: %d entries in %s cache\n", detail->entries, detail->name); for (i = 0; i < detail->hash_size; i++) { head = &detail->hash_table[i]; hlist_for_each_entry_safe(ch, tmp, head, cache_list) { hlist_del_init(&ch->cache_list); detail->entries--; set_bit(CACHE_CLEANED, &ch->flags); write_unlock(&detail->hash_lock); cache_fresh_unlocked(ch, detail); cache_put(ch, detail); write_lock(&detail->hash_lock); } } write_unlock(&detail->hash_lock); }

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PersonTokensPropCommitsCommitProp
Kinglong Mee14683.43%133.33%
Neil Brown2916.57%266.67%
Total175100.00%3100.00%

EXPORT_SYMBOL_GPL(cache_purge); /* * Deferral and Revisiting of Requests. * * If a cache lookup finds a pending entry, we * need to defer the request and revisit it later. * All deferred requests are stored in a hash table, * indexed by "struct cache_head *". * As it may be wasteful to store a whole request * structure, we allow the request to provide a * deferred form, which must contain a * 'struct cache_deferred_req' * This cache_deferred_req contains a method to allow * it to be revisited when cache info is available */ #define DFR_HASHSIZE (PAGE_SIZE/sizeof(struct list_head)) #define DFR_HASH(item) ((((long)item)>>4 ^ (((long)item)>>13)) % DFR_HASHSIZE) #define DFR_MAX 300 /* ??? */ static DEFINE_SPINLOCK(cache_defer_lock); static LIST_HEAD(cache_defer_list); static struct hlist_head cache_defer_hash[DFR_HASHSIZE]; static int cache_defer_cnt;
static void __unhash_deferred_req(struct cache_deferred_req *dreq) { hlist_del_init(&dreq->hash); if (!list_empty(&dreq->recent)) { list_del_init(&dreq->recent); cache_defer_cnt--; } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown2251.16%360.00%
J. Bruce Fields2046.51%120.00%
Adrian Bunk12.33%120.00%
Total43100.00%5100.00%


static void __hash_deferred_req(struct cache_deferred_req *dreq, struct cache_head *item) { int hash = DFR_HASH(item); INIT_LIST_HEAD(&dreq->recent); hlist_add_head(&dreq->hash, &cache_defer_hash[hash]); }

Contributors

PersonTokensPropCommitsCommitProp
J. Bruce Fields2554.35%114.29%
Neil Brown1941.30%571.43%
Andrew Morton24.35%114.29%
Total46100.00%7100.00%


static void setup_deferral(struct cache_deferred_req *dreq, struct cache_head *item, int count_me) { dreq->item = item; spin_lock(&cache_defer_lock); __hash_deferred_req(dreq, item); if (count_me) { cache_defer_cnt++; list_add(&dreq->recent, &cache_defer_list); } spin_unlock(&cache_defer_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown5484.38%450.00%
J. Bruce Fields57.81%225.00%
Andrew Morton46.25%112.50%
Adrian Bunk11.56%112.50%
Total64100.00%8100.00%

struct thread_deferred_req { struct cache_deferred_req handle; struct completion completion; };
static void cache_restart_thread(struct cache_deferred_req *dreq, int too_many) { struct thread_deferred_req *dr = container_of(dreq, struct thread_deferred_req, handle); complete(&dr->completion); }

Contributors

PersonTokensPropCommitsCommitProp
J. Bruce Fields2567.57%120.00%
Neil Brown1232.43%480.00%
Total37100.00%5100.00%


static void cache_wait_req(struct cache_req *req, struct cache_head *item) { struct thread_deferred_req sleeper; struct cache_deferred_req *dreq = &sleeper.handle; sleeper.completion = COMPLETION_INITIALIZER_ONSTACK(sleeper.completion); dreq->revisit = cache_restart_thread; setup_deferral(dreq, item, 0); if (!test_bit(CACHE_PENDING, &item->flags) || wait_for_completion_interruptible_timeout( &sleeper.completion, req->thread_wait) <= 0) { /* The completion wasn't completed, so we need * to clean up */ spin_lock(&cache_defer_lock); if (!hlist_unhashed(&sleeper.handle.hash)) { __unhash_deferred_req(&sleeper.handle); spin_unlock(&cache_defer_lock); } else { /* cache_revisit_request already removed * this from the hash table, but hasn't * called ->revisit yet. It will very soon * and we need to wait for it. */ spin_unlock(&cache_defer_lock); wait_for_completion(&sleeper.completion); } } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown8561.15%571.43%
J. Bruce Fields5438.85%228.57%
Total139100.00%7100.00%


static void cache_limit_defers(void) { /* Make sure we haven't exceed the limit of allowed deferred * requests. */ struct cache_deferred_req *discard = NULL; if (cache_defer_cnt <= DFR_MAX) return; spin_lock(&cache_defer_lock); /* Consider removing either the first or the last */ if (cache_defer_cnt > DFR_MAX) { if (prandom_u32() & 1) discard = list_entry(cache_defer_list.next, struct cache_deferred_req, recent); else discard = list_entry(cache_defer_list.prev, struct cache_deferred_req, recent); __unhash_deferred_req(discard); } spin_unlock(&cache_defer_lock); if (discard) discard->revisit(discard, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown7475.51%562.50%
J. Bruce Fields1919.39%112.50%
Andrew Morton44.08%112.50%
Aruna-Hewapathirane11.02%112.50%
Total98100.00%8100.00%

/* Return true if and only if a deferred request is queued. */
static bool cache_defer_req(struct cache_req *req, struct cache_head *item) { struct cache_deferred_req *dreq; if (req->thread_wait) { cache_wait_req(req, item); if (!test_bit(CACHE_PENDING, &item->flags)) return false; } dreq = req->defer(req); if (dreq == NULL) return false; setup_deferral(dreq, item, 1); if (!test_bit(CACHE_PENDING, &item->flags)) /* Bit could have been cleared before we managed to * set up the deferral, so need to revisit just in case */ cache_revisit_request(item); cache_limit_defers(); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown6764.42%675.00%
J. Bruce Fields3735.58%225.00%
Total104100.00%8100.00%


static void cache_revisit_request(struct cache_head *item) { struct cache_deferred_req *dreq; struct list_head pending; struct hlist_node *tmp; int hash = DFR_HASH(item); INIT_LIST_HEAD(&pending); spin_lock(&cache_defer_lock); hlist_for_each_entry_safe(dreq, tmp, &cache_defer_hash[hash], hash) if (dreq->item == item) { __unhash_deferred_req(dreq); list_add(&dreq->recent, &pending); } spin_unlock(&cache_defer_lock); while (!list_empty(&pending)) { dreq = list_entry(pending.next, struct cache_deferred_req, recent); list_del_init(&dreq->recent); dreq->revisit(dreq, 0); } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown11589.15%550.00%
Trond Myklebust64.65%110.00%
Thomas Gleixner32.33%110.00%
J. Bruce Fields21.55%110.00%
Anton Blanchard21.55%110.00%
David Howells10.78%110.00%
Total129100.00%10100.00%


void cache_clean_deferred(void *owner) { struct cache_deferred_req *dreq, *tmp; struct list_head pending; INIT_LIST_HEAD(&pending); spin_lock(&cache_defer_lock); list_for_each_entry_safe(dreq, tmp, &cache_defer_list, recent) { if (dreq->owner == owner) { __unhash_deferred_req(dreq); list_add(&dreq->recent, &pending); } } spin_unlock(&cache_defer_lock); while (!list_empty(&pending)) { dreq = list_entry(pending.next, struct cache_deferred_req, recent); list_del_init(&dreq->recent); dreq->revisit(dreq, 1); } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown11899.16%375.00%
J. Bruce Fields10.84%125.00%
Total119100.00%4100.00%

/* * communicate with user-space * * We have a magic /proc file - /proc/net/rpc/<cachename>/channel. * On read, you get a full request, or block. * On write, an update request is processed. * Poll works if anything to read, and always allows write. * * Implemented by linked list of requests. Each open file has * a ->private that also exists in this list. New requests are added * to the end and may wakeup and preceding readers. * New readers are added to the head. If, on read, an item is found with * CACHE_UPCALLING clear, we free it from the list. * */ static DEFINE_SPINLOCK(queue_lock); static DEFINE_MUTEX(queue_io_mutex); struct cache_queue { struct list_head list; int reader; /* if 0, then request */ }; struct cache_request { struct cache_queue q; struct cache_head *item; char * buf; int len; int readers; }; struct cache_reader { struct cache_queue q; int offset; /* if non-0, we have a refcnt on next request */ };
static int cache_request(struct cache_detail *detail, struct cache_request *crq) { char *bp = crq->buf; int len = PAGE_SIZE; detail->cache_request(detail, crq->item, &bp, &len); if (len < 0) return -EAGAIN; return PAGE_SIZE - len; }

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Stanislav Kinsbursky61100.00%1100.00%
Total61100.00%1100.00%


static ssize_t cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos, struct cache_detail *cd) { struct cache_reader *rp = filp->private_data; struct cache_request *rq; struct inode *inode = file_inode(filp); int err; if (count == 0) return 0; inode_lock(inode); /* protect against multiple concurrent * readers on this file */ again: spin_lock(&queue_lock); /* need to find next request */ while (rp->q.list.next != &cd->queue && list_entry(rp->q.list.next, struct cache_queue, list) ->reader) { struct list_head *next = rp->q.list.next; list_move(&rp->q.list, next); } if (rp->q.list.next == &cd->queue) { spin_unlock(&queue_lock); inode_unlock(inode); WARN_ON_ONCE(rp->offset); return 0; } rq = container_of(rp->q.list.next, struct cache_request, q.list); WARN_ON_ONCE(rq->q.reader); if (rp->offset == 0) rq->readers++; spin_unlock(&queue_lock); if (rq->len == 0) { err = cache_request(cd, rq); if (err < 0) goto out; rq->len = err; } if (rp->offset == 0 && !test_bit(CACHE_PENDING, &rq->item->flags)) { err = -EAGAIN; spin_lock(&queue_lock); list_move(&rp->q.list, &rq->q.list); spin_unlock(&queue_lock); } else { if (rp->offset + count > rq->len) count = rq->len - rp->offset; err = -EFAULT; if (copy_to_user(buf, rq->buf + rp->offset, count)) goto out; rp->offset += count; if (rp->offset >= rq->len) { rp->offset = 0; spin_lock(&queue_lock); list_move(&rp->q.list, &rq->q.list); spin_unlock(&queue_lock); } err = 0; } out: if (rp->offset == 0) { /* need to release rq */ spin_lock(&queue_lock); rq->readers--; if (rq->readers == 0 && !test_bit(CACHE_PENDING, &rq->item->flags)) { list_del(&rq->q.list); spin_unlock(&queue_lock); cache_put(rq->item, cd); kfree(rq->buf); kfree(rq); } else spin_unlock(&queue_lock); } if (err == -EAGAIN) goto again; inode_unlock(inode); return err ? err : count; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown47989.37%327.27%
Stanislav Kinsbursky346.34%19.09%
Trond Myklebust112.05%218.18%
Al Viro71.31%327.27%
Thomas Gleixner30.56%19.09%
Weston Andros Adamson20.37%19.09%
Total536100.00%11100.00%


static ssize_t cache_do_downcall(char *kaddr, const char __user *buf, size_t count, struct cache_detail *cd) { ssize_t ret; if (count == 0) return -EINVAL; if (copy_from_user(kaddr, buf, count)) return -EFAULT; kaddr[count] = '\0'; ret = cd->cache_parse(cd, kaddr, count); if (!ret) ret = count; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4553.57%125.00%
Neil Brown2833.33%125.00%
Dan Carpenter1011.90%125.00%
Al Viro11.19%125.00%
Total84100.00%4100.00%


static ssize_t cache_slow_downcall(const char __user *buf, size_t count, struct cache_detail *cd) { static char write_buf[8192]; /* protected by queue_io_mutex */ ssize_t ret = -EINVAL; if (count >= sizeof(write_buf)) goto out; mutex_lock(&queue_io_mutex); ret = cache_do_downcall(write_buf, buf, count, cd); mutex_unlock(&queue_io_mutex); out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3546.05%125.00%
Neil Brown3140.79%125.00%
Andrew Morton67.89%125.00%
Arjan van de Ven45.26%125.00%
Total76100.00%4100.00%


static ssize_t cache_downcall(struct address_space *mapping, const char __user *buf, size_t count, struct cache_detail *cd) { struct page *page; char *kaddr; ssize_t ret = -ENOMEM; if (count >= PAGE_SIZE) goto out_slow; page = find_or_create_page(mapping, 0, GFP_KERNEL); if (!page) goto out_slow; kaddr = kmap(page); ret = cache_do_downcall(kaddr, buf, count, cd); kunmap(page); unlock_page(page); put_page(page); return ret; out_slow: return cache_slow_downcall(buf, count, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust8168.64%125.00%
Neil Brown3428.81%125.00%
Kirill A. Shutemov21.69%125.00%
Kris Katterjohn10.85%125.00%
Total118100.00%4100.00%


static ssize_t cache_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos, struct cache_detail *cd) { struct address_space *mapping = filp->f_mapping; struct inode *inode = file_inode(filp); ssize_t ret = -EINVAL; if (!cd->cache_parse) goto out; inode_lock(inode); ret = cache_downcall(mapping, buf, count, cd); inode_unlock(inode); out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown4953.26%114.29%
Trond Myklebust3639.13%228.57%
Al Viro66.52%342.86%
Andrew Morton11.09%114.29%
Total92100.00%7100.00%

static DECLARE_WAIT_QUEUE_HEAD(queue_wait);
static unsigned int cache_poll(struct file *filp, poll_table *wait, struct cache_detail *cd) { unsigned int mask; struct cache_reader *rp = filp->private_data; struct cache_queue *cq; poll_wait(filp, &queue_wait, wait); /* alway allow write */ mask = POLLOUT | POLLWRNORM; if (!rp) return mask; spin_lock(&queue_lock); for (cq= &rp->q; &cq->list != &cd->queue; cq = list_entry(cq->list.next, struct cache_queue, list)) if (!cq->reader) { mask |= POLLIN | POLLRDNORM; break; } spin_unlock(&queue_lock); return mask; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown12495.38%250.00%
Trond Myklebust53.85%125.00%
Al Viro10.77%125.00%
Total130100.00%4100.00%


static int cache_ioctl(struct inode *ino, struct file *filp, unsigned int cmd, unsigned long arg, struct cache_detail *cd) { int len = 0; struct cache_reader *rp = filp->private_data; struct cache_queue *cq; if (cmd != FIONREAD || !rp) return -EINVAL; spin_lock(&queue_lock); /* only find the length remaining in current request, * or the length of the next request */ for (cq= &rp->q; &cq->list != &cd->queue; cq = list_entry(cq->list.next, struct cache_queue, list)) if (!cq->reader) { struct cache_request *cr = container_of(cq, struct cache_request, q); len = cr->len - rp->offset; break; } spin_unlock(&queue_lock); return put_user(len, (int __user *)arg); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown15196.18%250.00%
Trond Myklebust53.18%125.00%
Al Viro10.64%125.00%
Total157100.00%4100.00%


static int cache_open(struct inode *inode, struct file *filp, struct cache_detail *cd) { struct cache_reader *rp = NULL; if (!cd || !try_module_get(cd->owner)) return -EACCES; nonseekable_open(inode, filp); if (filp->f_mode & FMODE_READ) { rp = kmalloc(sizeof(*rp), GFP_KERNEL); if (!rp) { module_put(cd->owner); return -ENOMEM; } rp->offset = 0; rp->q.reader = 1; atomic_inc(&cd->readers); spin_lock(&queue_lock); list_add(&rp->q.list, &cd->queue); spin_unlock(&queue_lock); } filp->private_data = rp; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown11374.83%342.86%
Trond Myklebust2214.57%228.57%
Alexey Khoroshilov95.96%114.29%
Linus Torvalds74.64%114.29%
Total151100.00%7100.00%


static int cache_release(struct inode *inode, struct file *filp, struct cache_detail *cd) { struct cache_reader *rp = filp->private_data; if (rp) { spin_lock(&queue_lock); if (rp->offset) { struct cache_queue *cq; for (cq= &rp->q; &cq->list != &cd->queue; cq = list_entry(cq->list.next, struct cache_queue, list)) if (!cq->reader) { container_of(cq, struct cache_request, q) ->readers--; break; } rp->offset = 0; } list_del(&rp->q.list); spin_unlock(&queue_lock); filp->private_data = NULL; kfree(rp); cd->last_close = seconds_since_boot(); atomic_dec(&cd->readers); } module_put(cd->owner); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown15892.40%457.14%
Trond Myklebust127.02%228.57%
Andi Kleen10.58%114.29%
Total171100.00%7100.00%


static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch) { struct cache_queue *cq, *tmp; struct cache_request *cr; struct list_head dequeued; INIT_LIST_HEAD(&dequeued); spin_lock(&queue_lock); list_for_each_entry_safe(cq, tmp, &detail->queue, list) if (!cq->reader) { cr = container_of(cq, struct cache_request, q); if (cr->item != ch) continue; if (test_bit(CACHE_PENDING, &ch->flags)) /* Lost a race and it is pending again */ break; if (cr->readers != 0) continue; list_move(&cr->q.list, &dequeued); } spin_unlock(&queue_lock); while (!list_empty(&dequeued)) { cr = list_entry(dequeued.next, struct cache_request, q.list); list_del(&cr->q.list); cache_put(cr->item, detail); kfree(cr->buf); kfree(cr); } }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown185100.00%4100.00%
Total185100.00%4100.00%

/* * Support routines for text-based upcalls. * Fields are separated by spaces. * Fields are either mangled to quote space tab newline slosh with slosh * or a hexified with a leading \x * Record is terminated with newline. * */
void qword_add(char **bpp, int *lp, char *str) { char *bp = *bpp; int len = *lp; int ret; if (len < 0) return; ret = string_escape_str(str, bp, len, ESCAPE_OCTAL, "\\ \n\t"); if (ret >= len) { bp += len; len = -1; } else { bp += ret; len -= ret; *bp++ = ' '; len--; } *bpp = bp; *lp = len; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown7572.82%250.00%
Andy Shevchenko1716.50%125.00%
Rasmus Villemoes1110.68%125.00%
Total103100.00%4100.00%

EXPORT_SYMBOL_GPL(qword_add);
void qword_addhex(char **bpp, int *lp, char *buf, int blen) { char *bp = *bpp; int len = *lp; if (len < 0) return; if (len > 2) { *bp++ = '\\'; *bp++ = 'x'; len -= 2; while (blen && len >= 2) { bp = hex_byte_pack(bp, *buf++); len -= 2; blen--; } } if (blen || len<1) len = -1; else { *bp++ = ' '; len--; } *bpp = bp; *lp = len; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown12295.31%266.67%
Andy Shevchenko64.69%133.33%
Total128100.00%3100.00%

EXPORT_SYMBOL_GPL(qword_addhex);
static void warn_no_listener(struct cache_detail *detail) { if (detail->last_warn != detail->last_close) { detail->last_warn = detail->last_close; if (detail->warn_no_listener) detail->warn_no_listener(detail, detail->last_close != 0); } }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton4386.00%250.00%
Trond Myklebust612.00%125.00%
Adrian Bunk12.00%125.00%
Total50100.00%4100.00%


static bool cache_listeners_exist(struct cache_detail *detail) { if (atomic_read(&detail->readers)) return true; if (detail->last_close == 0) /* This cache was never opened */ return false; if (detail->last_close < seconds_since_boot() - 30) /* * We allow for the possibility that someone might * restart a userspace daemon without restarting the * server; but after 30 seconds, we give up. */ return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
J. Bruce Fields54100.00%1100.00%
Total54100.00%1100.00%

/* * register an upcall request to user-space and queue it up for read() by the * upcall daemon. * * Each request is at most one page long. */
int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h) { char *buf; struct cache_request *crq; int ret = 0; if (!detail->cache_request) return -EINVAL; if (!cache_listeners_exist(detail)) { warn_no_listener(detail); return -EINVAL; } if (test_bit(CACHE_CLEANED, &h->flags)) /* Too late to make an upcall */ return -EAGAIN; buf = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!buf) return -EAGAIN; crq = kmalloc(sizeof (*crq), GFP_KERNEL); if (!crq) { kfree(buf); return -EAGAIN; } crq->q.reader = 0; crq->buf = buf; crq->len = 0; crq->readers = 0; spin_lock(&queue_lock); if (test_bit(CACHE_PENDING, &h->flags)) { crq->item = cache_get(h); list_add_tail(&crq->q.list, &detail->queue); } else /* Lost a race, no longer PENDING, so don't enqueue */ ret = -EAGAIN; spin_unlock(&queue_lock); wake_up(&queue_wait); if (ret == -EAGAIN) { kfree(buf); kfree(crq); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown21491.45%444.44%
Stanislav Kinsbursky93.85%222.22%
Andrew Morton72.99%111.11%
J. Bruce Fields31.28%111.11%
Trond Myklebust10.43%111.11%
Total234100.00%9100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall); /* * parse a message from user-space and pass it * to an appropriate cache * Messages are, like requests, separated into fields by * spaces and dequotes as \xHEXSTRING or embedded \nnn octal * * Message is * reply cachename expiry key ... content.... * * key and content are both parsed by cache */
int qword_get(char **bpp, char *dest, int bufsize) { /* return bytes copied, or -1 on error */ char *bp = *bpp; int len = 0; while (*bp == ' ') bp++; if (bp[0] == '\\' && bp[1] == 'x') { /* HEX STRING */ bp += 2; while (len < bufsize - 1) { int h, l; h = hex_to_bin(bp[0]); if (h < 0) break; l = hex_to_bin(bp[1]); if (l < 0) break; *dest++ = (h << 4) | l; bp += 2; len++; } } else { /* text with \nnn octal quoting */ while (*bp != ' ' && *bp != '\n' && *bp && len < bufsize-1) { if (*bp == '\\' && isodigit(bp[1]) && (bp[1] <= '3') && isodigit(bp[2]) && isodigit(bp[3])) { int byte = (*++bp -'0'); bp++; byte = (byte << 3) | (*bp++ - '0'); byte = (byte << 3) | (*bp++ - '0'); *dest++ = byte; len++; } else { *dest++ = *bp++; len++; } } } if (*bp != ' ' && *bp != '\n' && *bp != '\0') return -1; while (*bp == ' ') bp++; *bpp = bp; *dest = '\0'; return len; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown27286.90%360.00%
Andy Shevchenko3912.46%120.00%
Stefan Hajnoczi20.64%120.00%
Total313100.00%5100.00%

EXPORT_SYMBOL_GPL(qword_get); /* * support /proc/net/rpc/$CACHENAME/content * as a seqfile. * We call ->cache_show passing NULL for the item to * get a header, then pass each real item in the cache */
void *cache_seq_start(struct seq_file *m, loff_t *pos) __acquires(cd->hash_lock) { loff_t n = *pos; unsigned int hash, entry; struct cache_head *ch; struct cache_detail *cd = m->private; read_lock(&cd->hash_lock); if (!n--) return SEQ_START_TOKEN; hash = n >> 32; entry = n & ((1LL<<32) - 1); hlist_for_each_entry(ch, &cd->hash_table[hash], cache_list) if (!entry--) return ch; n &= ~((1LL<<32) - 1); do { hash++; n += 1LL<<32; } while(hash < cd->hash_size && hlist_empty(&cd->hash_table[hash])); if (hash >= cd->hash_size) return NULL; *pos = n+1; return hlist_entry_safe(cd->hash_table[hash].first, struct cache_head, cache_list); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown15182.97%116.67%
Kinglong Mee2312.64%233.33%
Eric Dumazet73.85%233.33%
Joe Perches10.55%116.67%
Total182100.00%6100.00%

EXPORT_SYMBOL_GPL(cache_seq_start);
void *cache_seq_next(struct seq_file *m, void *p, loff_t *pos) { struct cache_head *ch = p; int hash = (*pos >> 32); struct cache_detail *cd = m->private; if (p == SEQ_START_TOKEN) hash = 0; else if (ch->cache_list.next == NULL) { hash++; *pos += 1LL<<32; } else { ++*pos; return hlist_entry_safe(ch->cache_list.next, struct cache_head, cache_list); } *pos &= ~((1LL<<32) - 1); while (hash < cd->hash_size && hlist_empty(&cd->hash_table[hash])) { hash++; *pos += 1LL<<32; } if (hash >= cd->hash_size) return NULL; ++*pos; return hlist_entry_safe(cd->hash_table[hash].first, struct cache_head, cache_list); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown15084.27%125.00%
Kinglong Mee2715.17%250.00%
Joe Perches10.56%125.00%
Total178100.00%4100.00%

EXPORT_SYMBOL_GPL(cache_seq_next);
void cache_seq_stop(struct seq_file *m, void *p) __releases(cd->hash_lock) { struct cache_detail *cd = m->private; read_unlock(&cd->hash_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown3081.08%133.33%
Eric Dumazet616.22%133.33%
Kinglong Mee12.70%133.33%
Total37100.00%3100.00%

EXPORT_SYMBOL_GPL(cache_seq_stop);
static int c_show(struct seq_file *m, void *p) { struct cache_head *cp = p; struct cache_detail *cd = m->private; if (p == SEQ_START_TOKEN) return cd->cache_show(m, cd, NULL); ifdebug(CACHE) seq_printf(m, "# expiry=%ld refcnt=%d flags=%lx\n", convert_to_wallclock(cp->expiry_time), kref_read(&cp->ref), cp->flags); cache_get(cp); if (cache_check(cd, cp, NULL)) /* cache_check does a cache_put on failure */ seq_printf(m, "# "); else { if (cache_is_expired(cd, cp)) seq_printf(m, "# "); cache_put(cp, cd); } return cd->cache_show(m, cd, cp); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown13998.58%675.00%
Peter Zijlstra10.71%112.50%
Joe Perches10.71%112.50%
Total141100.00%8100.00%

static const struct seq_operations cache_content_op = { .start = cache_seq_start, .next = cache_seq_next, .stop = cache_seq_stop, .show = c_show, };
static int content_open(struct inode *inode, struct file *file, struct cache_detail *cd) { struct seq_file *seq; int err; if (!cd || !try_module_get(cd->owner)) return -EACCES; err = seq_open(file, &cache_content_op); if (err) { module_put(cd->owner); return err; } seq = file->private_data; seq->private = cd; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown3439.08%116.67%
Trond Myklebust2225.29%233.33%
Kinglong Mee1719.54%116.67%
Li Zefan910.34%116.67%
Pavel Emelyanov55.75%116.67%
Total87100.00%6100.00%


static int content_release(struct inode *inode, struct file *file, struct cache_detail *cd) { int ret = seq_release(inode, file); module_put(cd->owner); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4097.56%150.00%
Kinglong Mee12.44%150.00%
Total41100.00%2100.00%


static int open_flush(struct inode *inode, struct file *file, struct cache_detail *cd) { if (!cd || !try_module_get(cd->owner)) return -EACCES; return nonseekable_open(inode, file); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust46100.00%1100.00%
Total46100.00%1100.00%


static int release_flush(struct inode *inode, struct file *file, struct cache_detail *cd) { module_put(cd->owner); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust31100.00%1100.00%
Total31100.00%1100.00%


static ssize_t read_flush(struct file *file, char __user *buf, size_t count, loff_t *ppos, struct cache_detail *cd) { char tbuf[22]; size_t len; len = snprintf(tbuf, sizeof(tbuf), "%lu\n", convert_to_wallclock(cd->flush_time)); return simple_read_from_buffer(buf, count, ppos, tbuf, len); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown5373.61%228.57%
Kinglong Mee79.72%114.29%
Sasha Levin79.72%114.29%
Trond Myklebust34.17%114.29%
Chuck Lever11.39%114.29%
Al Viro11.39%114.29%
Total72100.00%7100.00%


static ssize_t write_flush(struct file *file, const char __user *buf, size_t count, loff_t *ppos, struct cache_detail *cd) { char tbuf[20]; char *bp, *ep; time_t then, now; if (*ppos || count > sizeof(tbuf)-1) return -EINVAL; if (copy_from_user(tbuf, buf, count)) return -EFAULT; tbuf[count] = 0; simple_strtoul(tbuf, &ep, 0); if (*ep && *ep != '\n') return -EINVAL; bp = tbuf; then = get_expiry(&bp); now = seconds_since_boot(); cd->nextcheck = now; /* Can only set flush_time to 1 second beyond "now", or * possibly 1 second beyond flushtime. This is because * flush_time never goes backwards so it mustn't get too far * ahead of time. */ if (then >= now) { /* Want to flush everything, so behave like cache_purge() */ if (cd->flush_time >= now) now = cd->flush_time + 1; then = now; } cd->flush_time = then; cache_flush(); *ppos += count; return count; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown17797.79%360.00%
Trond Myklebust31.66%120.00%
Al Viro10.55%120.00%
Total181100.00%5100.00%


static ssize_t cache_read_procfs(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = PDE_DATA(file_inode(filp)); return cache_read(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4386.00%125.00%
Al Viro48.00%250.00%
Neil Brown36.00%125.00%
Total50100.00%4100.00%


static ssize_t cache_write_procfs(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = PDE_DATA(file_inode(filp)); return cache_write(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4792.16%133.33%
Al Viro47.84%266.67%
Total51100.00%3100.00%


static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait) { struct cache_detail *cd = PDE_DATA(file_inode(filp)); return cache_poll(filp, wait, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3487.18%125.00%
Al Viro410.26%250.00%
Neil Brown12.56%125.00%
Total39100.00%4100.00%


static long cache_ioctl_procfs(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); struct cache_detail *cd = PDE_DATA(inode); return cache_ioctl(inode, filp, cmd, arg, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4075.47%120.00%
Frédéric Weisbecker815.09%120.00%
Al Viro47.55%240.00%
Arnd Bergmann11.89%120.00%
Total53100.00%5100.00%


static int cache_open_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return cache_open(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%


static int cache_release_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return cache_release(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%

static const struct file_operations cache_file_operations_procfs = { .owner = THIS_MODULE, .llseek = no_llseek, .read = cache_read_procfs, .write = cache_write_procfs, .poll = cache_poll_procfs, .unlocked_ioctl = cache_ioctl_procfs, /* for FIONREAD */ .open = cache_open_procfs, .release = cache_release_procfs, };
static int content_open_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return content_open(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%


static int content_release_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return content_release(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%

static const struct file_operations content_file_operations_procfs = { .open = content_open_procfs, .read = seq_read, .llseek = seq_lseek, .release = content_release_procfs, };
static int open_flush_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return open_flush(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%


static int release_flush_procfs(struct inode *inode, struct file *filp) { struct cache_detail *cd = PDE_DATA(inode); return release_flush(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3597.22%150.00%
Al Viro12.78%150.00%
Total36100.00%2100.00%


static ssize_t read_flush_procfs(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = PDE_DATA(file_inode(filp)); return read_flush(filp, buf, count, ppos, cd); }

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PersonTokensPropCommitsCommitProp
Trond Myklebust4692.00%133.33%
Al Viro48.00%266.67%
Total50100.00%3100.00%


static ssize_t write_flush_procfs(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = PDE_DATA(file_inode(filp)); return write_flush(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4792.16%133.33%
Al Viro47.84%266.67%
Total51100.00%3100.00%

static const struct file_operations cache_flush_operations_procfs = { .open = open_flush_procfs, .read = read_flush_procfs, .write = write_flush_procfs, .release = release_flush_procfs, .llseek = no_llseek, };
static void remove_cache_proc_entries(struct cache_detail *cd) { if (cd->procfs) { proc_remove(cd->procfs); cd->procfs = NULL; } }

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PersonTokensPropCommitsCommitProp
Trond Myklebust2990.62%150.00%
Kinglong Mee39.38%150.00%
Total32100.00%2100.00%

#ifdef CONFIG_PROC_FS
static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) { struct proc_dir_entry *p; struct sunrpc_net *sn; sn = net_generic(net, sunrpc_net_id); cd->procfs = proc_mkdir(cd->name, sn->proc_net_rpc); if (cd->procfs == NULL) goto out_nomem; p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR, cd->procfs, &cache_flush_operations_procfs, cd); if (p == NULL) goto out_nomem; if (cd->cache_request || cd->cache_parse) { p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR, cd->procfs, &cache_file_operations_procfs, cd); if (p == NULL) goto out_nomem; } if (cd->cache_show) { p = proc_create_data("content", S_IFREG|S_IRUSR, cd->procfs, &content_file_operations_procfs, cd); if (p == NULL) goto out_nomem; } return 0; out_nomem: remove_cache_proc_entries(cd); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust16287.10%233.33%
Pavel Emelyanov2111.29%233.33%
Neil Brown21.08%116.67%
Stanislav Kinsbursky10.54%116.67%
Total186100.00%6100.00%

#else /* CONFIG_PROC_FS */
static int create_cache_proc_entries(struct cache_detail *cd, struct net *net) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust736.84%125.00%
Neil Brown526.32%125.00%
Pavel Emelyanov526.32%125.00%
Eric Dumazet210.53%125.00%
Total19100.00%4100.00%

#endif
void __init cache_initialize(void) { INIT_DEFERRABLE_WORK(&cache_cleaner, do_cache_clean); }

Contributors

PersonTokensPropCommitsCommitProp
Artem B. Bityutskiy1593.75%150.00%
Tejun Heo16.25%150.00%
Total16100.00%2100.00%


int cache_register_net(struct cache_detail *cd, struct net *net) { int ret; sunrpc_init_cache_detail(cd); ret = create_cache_proc_entries(cd, net); if (ret) sunrpc_destroy_cache_detail(cd); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown1943.18%133.33%
Trond Myklebust1738.64%133.33%
Pavel Emelyanov818.18%133.33%
Total44100.00%3100.00%

EXPORT_SYMBOL_GPL(cache_register_net);
void cache_unregister_net(struct cache_detail *cd, struct net *net) { remove_cache_proc_entries(cd); sunrpc_destroy_cache_detail(cd); }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov1768.00%133.33%
Trond Myklebust728.00%133.33%
Neil Brown14.00%133.33%
Total25100.00%3100.00%

EXPORT_SYMBOL_GPL(cache_unregister_net);
struct cache_detail *cache_create_net(struct cache_detail *tmpl, struct net *net) { struct cache_detail *cd; int i; cd = kmemdup(tmpl, sizeof(struct cache_detail), GFP_KERNEL); if (cd == NULL) return ERR_PTR(-ENOMEM); cd->hash_table = kzalloc(cd->hash_size * sizeof(struct hlist_head), GFP_KERNEL); if (cd->hash_table == NULL) { kfree(cd); return ERR_PTR(-ENOMEM); } for (i = 0; i < cd->hash_size; i++) INIT_HLIST_HEAD(&cd->hash_table[i]); cd->net = net; return cd; }

Contributors

PersonTokensPropCommitsCommitProp
Stanislav Kinsbursky7860.47%120.00%
Kinglong Mee3023.26%120.00%
Trond Myklebust1410.85%120.00%
Pavel Emelyanov64.65%120.00%
Neil Brown10.78%120.00%
Total129100.00%5100.00%

EXPORT_SYMBOL_GPL(cache_create_net);
void cache_destroy_net(struct cache_detail *cd, struct net *net) { kfree(cd->hash_table); kfree(cd); }

Contributors

PersonTokensPropCommitsCommitProp
Stanislav Kinsbursky1451.85%150.00%
Pavel Emelyanov1348.15%150.00%
Total27100.00%2100.00%

EXPORT_SYMBOL_GPL(cache_destroy_net);
static ssize_t cache_read_pipefs(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = RPC_I(file_inode(filp))->private; return cache_read(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3057.69%133.33%
Neil Brown1936.54%133.33%
Al Viro35.77%133.33%
Total52100.00%3100.00%


static ssize_t cache_write_pipefs(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = RPC_I(file_inode(filp))->private; return cache_write(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust4584.91%133.33%
Neil Brown59.43%133.33%
Al Viro35.66%133.33%
Total53100.00%3100.00%


static unsigned int cache_poll_pipefs(struct file *filp, poll_table *wait) { struct cache_detail *cd = RPC_I(file_inode(filp))->private; return cache_poll(filp, wait, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust2048.78%125.00%
Neil Brown1741.46%125.00%
Al Viro37.32%125.00%
Eric Dumazet12.44%125.00%
Total41100.00%4100.00%


static long cache_ioctl_pipefs(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); struct cache_detail *cd = RPC_I(inode)->private; return cache_ioctl(inode, filp, cmd, arg, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust2240.00%114.29%
Neil Brown2138.18%342.86%
Frédéric Weisbecker814.55%114.29%
Al Viro35.45%114.29%
Arnd Bergmann11.82%114.29%
Total55100.00%7100.00%


static int cache_open_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return cache_open(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3284.21%133.33%
Neil Brown615.79%266.67%
Total38100.00%3100.00%


static int cache_release_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return cache_release(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3078.95%150.00%
Neil Brown821.05%150.00%
Total38100.00%2100.00%

const struct file_operations cache_file_operations_pipefs = { .owner = THIS_MODULE, .llseek = no_llseek, .read = cache_read_pipefs, .write = cache_write_pipefs, .poll = cache_poll_pipefs, .unlocked_ioctl = cache_ioctl_pipefs, /* for FIONREAD */ .open = cache_open_pipefs, .release = cache_release_pipefs, };
static int content_open_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return content_open(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown2668.42%133.33%
Trond Myklebust1026.32%133.33%
Pavel Emelyanov25.26%133.33%
Total38100.00%3100.00%


static int content_release_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return content_release(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3489.47%150.00%
Neil Brown410.53%150.00%
Total38100.00%2100.00%

const struct file_operations content_file_operations_pipefs = { .open = content_open_pipefs, .read = seq_read, .llseek = seq_lseek, .release = content_release_pipefs, };
static int open_flush_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return open_flush(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3797.37%150.00%
Neil Brown12.63%150.00%
Total38100.00%2100.00%


static int release_flush_pipefs(struct inode *inode, struct file *filp) { struct cache_detail *cd = RPC_I(inode)->private; return release_flush(inode, filp, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3489.47%150.00%
Neil Brown410.53%150.00%
Total38100.00%2100.00%


static ssize_t read_flush_pipefs(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = RPC_I(file_inode(filp))->private; return read_flush(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown3057.69%125.00%
Trond Myklebust1834.62%125.00%
Al Viro47.69%250.00%
Total52100.00%4100.00%


static ssize_t write_flush_pipefs(struct file *filp, const char __user *buf, size_t count, loff_t *ppos) { struct cache_detail *cd = RPC_I(file_inode(filp))->private; return write_flush(filp, buf, count, ppos, cd); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown3769.81%125.00%
Trond Myklebust1222.64%125.00%
Al Viro47.55%250.00%
Total53100.00%4100.00%

const struct file_operations cache_flush_operations_pipefs = { .open = open_flush_pipefs, .read = read_flush_pipefs, .write = write_flush_pipefs, .release = release_flush_pipefs, .llseek = no_llseek, };
int sunrpc_cache_register_pipefs(struct dentry *parent, const char *name, umode_t umode, struct cache_detail *cd) { struct dentry *dir = rpc_create_cache_dir(parent, name, umode, cd); if (IS_ERR(dir)) return PTR_ERR(dir); cd->pipefs = dir; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust3862.30%125.00%
Neil Brown1321.31%125.00%
Al Viro1016.39%250.00%
Total61100.00%4100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_register_pipefs);
void sunrpc_cache_unregister_pipefs(struct cache_detail *cd) { if (cd->pipefs) { rpc_remove_cache_dir(cd->pipefs); cd->pipefs = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
Trond Myklebust2064.52%133.33%
Kinglong Mee825.81%133.33%
Neil Brown39.68%133.33%
Total31100.00%3100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_unregister_pipefs);
void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h) { write_lock(&cd->hash_lock); if (!hlist_unhashed(&h->cache_list)){ hlist_del_init(&h->cache_list); cd->entries--; write_unlock(&cd->hash_lock); cache_put(h, cd); } else write_unlock(&cd->hash_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Brown73100.00%1100.00%
Total73100.00%1100.00%

EXPORT_SYMBOL_GPL(sunrpc_cache_unhash);

Overall Contributors

PersonTokensPropCommitsCommitProp
Neil Brown530361.06%4332.58%
Trond Myklebust181420.89%96.82%
J. Bruce Fields4224.86%118.33%
Kinglong Mee3704.26%75.30%
Stanislav Kinsbursky2272.61%53.79%
Andrew Morton991.14%53.79%
Pavel Emelyanov800.92%32.27%
Al Viro780.90%75.30%
Andy Shevchenko650.75%32.27%
Adrian Bunk310.36%21.52%
Frédéric Weisbecker200.23%32.27%
Artem B. Bityutskiy180.21%10.76%
Thomas Gleixner160.18%10.76%
Eric Dumazet160.18%21.52%
Arnd Bergmann120.14%21.52%
Rasmus Villemoes110.13%10.76%
Arjan van de Ven100.12%21.52%
Dan Carpenter100.12%10.76%
Li Zefan90.10%10.76%
Alexey Khoroshilov90.10%10.76%
Linus Torvalds80.09%21.52%
Sasha Levin70.08%10.76%
David Howells70.08%10.76%
Ke Wang60.07%10.76%
Anton Blanchard50.06%10.76%
Andi Kleen50.06%10.76%
Joe Perches30.03%10.76%
Christoph Hellwig30.03%10.76%
Hideaki Yoshifuji / 吉藤英明30.03%10.76%
Wang Chen30.03%10.76%
Philippe De Muyter20.02%10.76%
Stefan Hajnoczi20.02%10.76%
Weston Andros Adamson20.02%10.76%
Chuck Lever20.02%21.52%
Kirill A. Shutemov20.02%10.76%
Aruna-Hewapathirane10.01%10.76%
Kris Katterjohn10.01%10.76%
Tejun Heo10.01%10.76%
Peter Zijlstra10.01%10.76%
Denis V. Lunev10.01%10.76%
Total8685100.00%132100.00%
Directory: net/sunrpc
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