lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

autofs4 - remove autofs4_lock

Browse Source 
The autofs4_lock introduced by the rcu-walk changes has unnecessarily
broad scope. The locking is better handled by the per-autofs super
block lookup_lock.

Signed-off-by: Ian Kent <raven@themaw.net>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Ian Kent
2011-03-25 01:51:31 +08:00
committed by Al Viro
parent 83fb96bfc7
commit e7854723d0
4 changed files with 20 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
fs/autofs4/expire.c
View File

@@ -92,10 +92,11 @@ done:
static struct dentry *get_next_positive_subdir(struct dentry *prev,
struct dentry *root)
{
struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
struct list_head *next;
struct dentry *p, *q;
spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
if (prev == NULL) {
spin_lock(&root->d_lock);
@@ -112,7 +113,7 @@ again:
start:
if (next == &root->d_subdirs) {
spin_unlock(&p->d_lock);
spin_unlock(&autofs4_lock);
spin_unlock(&sbi->lookup_lock);
dput(prev);
return NULL;
}
@@ -129,7 +130,7 @@ start:
dget_dlock(q);
spin_unlock(&q->d_lock);
spin_unlock(&p->d_lock);
spin_unlock(&autofs4_lock);
spin_unlock(&sbi->lookup_lock);
dput(prev);
@@ -142,13 +143,14 @@ start:
static struct dentry *get_next_positive_dentry(struct dentry *prev,
struct dentry *root)
{
struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
struct list_head *next;
struct dentry *p, *ret;
if (prev == NULL)
return dget(root);
spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
relock:
p = prev;
spin_lock(&p->d_lock);
@@ -160,7 +162,7 @@ again:
if (p == root) {
spin_unlock(&p->d_lock);
spin_unlock(&autofs4_lock);
spin_unlock(&sbi->lookup_lock);
dput(prev);
return NULL;
}
@@ -190,7 +192,7 @@ again:
dget_dlock(ret);
spin_unlock(&ret->d_lock);
spin_unlock(&p->d_lock);
spin_unlock(&autofs4_lock);
spin_unlock(&sbi->lookup_lock);
dput(prev);
@@ -459,13 +461,13 @@ found:
ino->flags |= AUTOFS_INF_EXPIRING;
init_completion(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
spin_lock(&expired->d_parent->d_lock);
spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED);
list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child);
spin_unlock(&expired->d_lock);
spin_unlock(&expired->d_parent->d_lock);
spin_unlock(&autofs4_lock);
spin_unlock(&sbi->lookup_lock);
return expired;
}