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dentries: Extract common code to remove dentry from lru 

Extract the common code to remove a dentry from the lru into a new function
dentry_lru_remove().

Two call sites used list_del() instead of list_del_init().  AFAIK the
performance of both is the same.  dentry_lru_remove() does a list_del_init().

As a result dentry->d_lru is now always empty when a dentry is freed.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2008-02-14 19:38:45 -08:00 committed by Linus Torvalds
parent cf28b4863f
commit 4a0962abd1
1 changed files with 14 additions and 28 deletions
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42
fs/dcache.c
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@ -95,6 +95,14 @@ static void d_free(struct dentry *dentry)
call_rcu(&dentry->d_u.d_rcu, d_callback);
}
static void dentry_lru_remove(struct dentry *dentry)
{
if (!list_empty(&dentry->d_lru)) {
list_del_init(&dentry->d_lru);
dentry_stat.nr_unused--;
}
}
/*
* Release the dentry's inode, using the filesystem
* d_iput() operation if defined.
@ -211,13 +219,7 @@ repeat:
unhash_it:
__d_drop(dentry);
kill_it:
/* If dentry was on d_lru list
* delete it from there
*/
if (!list_empty(&dentry->d_lru)) {
list_del(&dentry->d_lru);
dentry_stat.nr_unused--;
}
dentry_lru_remove(dentry);
dentry = d_kill(dentry);
if (dentry)
goto repeat;
@ -285,10 +287,7 @@ int d_invalidate(struct dentry * dentry)
static inline struct dentry * __dget_locked(struct dentry *dentry)
{
atomic_inc(&dentry->d_count);
if (!list_empty(&dentry->d_lru)) {
dentry_stat.nr_unused--;
list_del_init(&dentry->d_lru);
}
dentry_lru_remove(dentry);
return dentry;
}
@ -404,10 +403,7 @@ static void prune_one_dentry(struct dentry * dentry)
if (dentry->d_op && dentry->d_op->d_delete)
dentry->d_op->d_delete(dentry);
if (!list_empty(&dentry->d_lru)) {
list_del(&dentry->d_lru);
dentry_stat.nr_unused--;
}
dentry_lru_remove(dentry);
__d_drop(dentry);
dentry = d_kill(dentry);
spin_lock(&dcache_lock);
@ -596,10 +592,7 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
/* detach this root from the system */
spin_lock(&dcache_lock);
if (!list_empty(&dentry->d_lru)) {
dentry_stat.nr_unused--;
list_del_init(&dentry->d_lru);
}
dentry_lru_remove(dentry);
__d_drop(dentry);
spin_unlock(&dcache_lock);
@ -613,11 +606,7 @@ static void shrink_dcache_for_umount_subtree(struct dentry *dentry)
spin_lock(&dcache_lock);
list_for_each_entry(loop, &dentry->d_subdirs,
d_u.d_child) {
if (!list_empty(&loop->d_lru)) {
dentry_stat.nr_unused--;
list_del_init(&loop->d_lru);
}
dentry_lru_remove(loop);
__d_drop(loop);
cond_resched_lock(&dcache_lock);
}
@ -799,10 +788,7 @@ resume:
struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
next = tmp->next;
if (!list_empty(&dentry->d_lru)) {
dentry_stat.nr_unused--;
list_del_init(&dentry->d_lru);
}
dentry_lru_remove(dentry);
/*
* move only zero ref count dentries to the end
* of the unused list for prune_dcache