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authorAl Viro <viro@zeniv.linux.org.uk>2023-11-03 14:46:14 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2023-11-25 02:34:13 -0500
commitb4cc0734d25746d402db3baa6082d19109bca951 (patch)
treeb704ddc51d71377992d42ec0c78d349be8e07769 /fs/dcache.c
parentf5c8a8a4b6c90f2160de6b580fa672b4afc15061 (diff)
d_prune_aliases(): use a shrink list
Instead of dropping aliases one by one, restarting, etc., just collect them into a shrink list and kill them off in one pass. We don't really need the restarts - one alias can't pin another (directory has only one alias, and couldn't be its own ancestor anyway), so collecting everything that is not busy and taking it out would take care of everything evictable that had been there as we entered the function. And new aliases added while we'd been dropping old ones could just as easily have appeared right as we return to caller... Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c30
1 files changed, 5 insertions, 25 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index f68fe7c863e0..a3cc612a80d5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -647,20 +647,6 @@ again:
return parent;
}
-static inline struct dentry *lock_parent(struct dentry *dentry)
-{
- struct dentry *parent = dentry->d_parent;
- if (IS_ROOT(dentry))
- return NULL;
- if (likely(spin_trylock(&parent->d_lock)))
- return parent;
- rcu_read_lock();
- spin_unlock(&dentry->d_lock);
- parent = __lock_parent(dentry);
- rcu_read_unlock();
- return parent;
-}
-
/*
* Lock a dentry for feeding it to __dentry_kill().
* Called under rcu_read_lock() and dentry->d_lock; the former
@@ -1090,24 +1076,18 @@ struct dentry *d_find_alias_rcu(struct inode *inode)
*/
void d_prune_aliases(struct inode *inode)
{
+ LIST_HEAD(dispose);
struct dentry *dentry;
-restart:
+
spin_lock(&inode->i_lock);
hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
spin_lock(&dentry->d_lock);
- if (!dentry->d_lockref.count) {
- struct dentry *parent = lock_parent(dentry);
- if (likely(!dentry->d_lockref.count)) {
- __dentry_kill(dentry);
- dput(parent);
- goto restart;
- }
- if (parent)
- spin_unlock(&parent->d_lock);
- }
+ if (!dentry->d_lockref.count)
+ to_shrink_list(dentry, &dispose);
spin_unlock(&dentry->d_lock);
}
spin_unlock(&inode->i_lock);
+ shrink_dentry_list(&dispose);
}
EXPORT_SYMBOL(d_prune_aliases);