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vfs: restructure d_genocide()

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It shouldn't matter when we decrement the refcount during the walk as long
as we do it exactly once.

Restructure d_genocide() to do the killing on entering the dentry instead
of when leaving it.  This helps creating a common helper for tree walking.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2013-09-05 11:44:34 +02:00 committed by Al Viro
parent a09e9a7a4b
commit 01ddc4ede5
1 changed files with 4 additions and 8 deletions
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12
fs/dcache.c
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@ -2952,6 +2952,10 @@ void d_genocide(struct dentry *root)
spin_unlock(&dentry->d_lock); spin_unlock(&dentry->d_lock);
continue; continue;
} }
if (!(dentry->d_flags & DCACHE_GENOCIDE)) {
dentry->d_flags |= DCACHE_GENOCIDE;
dentry->d_lockref.count--;
}
if (!list_empty(&dentry->d_subdirs)) { if (!list_empty(&dentry->d_subdirs)) {
spin_unlock(&this_parent->d_lock); spin_unlock(&this_parent->d_lock);
spin_release(&dentry->d_lock.dep_map, 1, _RET_IP_); spin_release(&dentry->d_lock.dep_map, 1, _RET_IP_);
@ -2959,18 +2963,10 @@ void d_genocide(struct dentry *root)
spin_acquire(&this_parent->d_lock.dep_map, 0, 1, _RET_IP_); spin_acquire(&this_parent->d_lock.dep_map, 0, 1, _RET_IP_);
goto repeat; goto repeat;
} }
if (!(dentry->d_flags & DCACHE_GENOCIDE)) {
dentry->d_flags |= DCACHE_GENOCIDE;
dentry->d_lockref.count--;
}
spin_unlock(&dentry->d_lock); spin_unlock(&dentry->d_lock);
} }
if (this_parent != root) { if (this_parent != root) {
struct dentry *child = this_parent; struct dentry *child = this_parent;
if (!(this_parent->d_flags & DCACHE_GENOCIDE)) {
this_parent->d_flags |= DCACHE_GENOCIDE;
this_parent->d_lockref.count--;
}
this_parent = try_to_ascend(this_parent, locked, seq); this_parent = try_to_ascend(this_parent, locked, seq);
if (!this_parent) if (!this_parent)
goto rename_retry; goto rename_retry;