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-rw-r--r--fs/dcache.c76
1 files changed, 24 insertions, 52 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 494a9def5dce..9b15c5c37277 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -246,23 +246,6 @@ static void __d_free(struct rcu_head *head)
246 kmem_cache_free(dentry_cache, dentry); 246 kmem_cache_free(dentry_cache, dentry);
247} 247}
248 248
249/*
250 * no locks, please.
251 */
252static void d_free(struct dentry *dentry)
253{
254 BUG_ON((int)dentry->d_lockref.count > 0);
255 this_cpu_dec(nr_dentry);
256 if (dentry->d_op && dentry->d_op->d_release)
257 dentry->d_op->d_release(dentry);
258
259 /* if dentry was never visible to RCU, immediate free is OK */
260 if (!(dentry->d_flags & DCACHE_RCUACCESS))
261 __d_free(&dentry->d_u.d_rcu);
262 else
263 call_rcu(&dentry->d_u.d_rcu, __d_free);
264}
265
266/** 249/**
267 * dentry_rcuwalk_barrier - invalidate in-progress rcu-walk lookups 250 * dentry_rcuwalk_barrier - invalidate in-progress rcu-walk lookups
268 * @dentry: the target dentry 251 * @dentry: the target dentry
@@ -420,40 +403,6 @@ static void dentry_lru_del(struct dentry *dentry)
420} 403}
421 404
422/** 405/**
423 * d_kill - kill dentry and return parent
424 * @dentry: dentry to kill
425 * @parent: parent dentry
426 *
427 * The dentry must already be unhashed and removed from the LRU.
428 *
429 * If this is the root of the dentry tree, return NULL.
430 *
431 * dentry->d_lock and parent->d_lock must be held by caller, and are dropped by
432 * d_kill.
433 */
434static struct dentry *d_kill(struct dentry *dentry, struct dentry *parent)
435 __releases(dentry->d_lock)
436 __releases(parent->d_lock)
437 __releases(dentry->d_inode->i_lock)
438{
439 list_del(&dentry->d_u.d_child);
440 /*
441 * Inform d_walk() that we are no longer attached to the
442 * dentry tree
443 */
444 dentry->d_flags |= DCACHE_DENTRY_KILLED;
445 if (parent)
446 spin_unlock(&parent->d_lock);
447 dentry_iput(dentry);
448 /*
449 * dentry_iput drops the locks, at which point nobody (except
450 * transient RCU lookups) can reach this dentry.
451 */
452 d_free(dentry);
453 return parent;
454}
455
456/**
457 * d_drop - drop a dentry 406 * d_drop - drop a dentry
458 * @dentry: dentry to drop 407 * @dentry: dentry to drop
459 * 408 *
@@ -546,7 +495,30 @@ relock:
546 dentry_lru_del(dentry); 495 dentry_lru_del(dentry);
547 /* if it was on the hash then remove it */ 496 /* if it was on the hash then remove it */
548 __d_drop(dentry); 497 __d_drop(dentry);
549 return d_kill(dentry, parent); 498 list_del(&dentry->d_u.d_child);
499 /*
500 * Inform d_walk() that we are no longer attached to the
501 * dentry tree
502 */
503 dentry->d_flags |= DCACHE_DENTRY_KILLED;
504 if (parent)
505 spin_unlock(&parent->d_lock);
506 dentry_iput(dentry);
507 /*
508 * dentry_iput drops the locks, at which point nobody (except
509 * transient RCU lookups) can reach this dentry.
510 */
511 BUG_ON((int)dentry->d_lockref.count > 0);
512 this_cpu_dec(nr_dentry);
513 if (dentry->d_op && dentry->d_op->d_release)
514 dentry->d_op->d_release(dentry);
515
516 /* if dentry was never visible to RCU, immediate free is OK */
517 if (!(dentry->d_flags & DCACHE_RCUACCESS))
518 __d_free(&dentry->d_u.d_rcu);
519 else
520 call_rcu(&dentry->d_u.d_rcu, __d_free);
521 return parent;
550} 522}
551 523
552/* 524/*