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[PATCH] inotify/idr leak fix

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Fix a bug which was reported and diagnosed by
Stefan Jones <[email protected]>

IDR trees include a cache of idr_layer objects.  There's no way to destroy
this cache, so when we discard an overall idr tree we end up leaking some
memory.

Add and use idr_destroy() for this.  v9fs and infiniband also need to use
idr_destroy() to avoid leaks.

Or, we make the cache global, like radix_tree_preload().  Which is probably
better.  Later.

Cc: Eric Van Hensbergen <[email protected]>
Cc: Roland Dreier <[email protected]>
Cc: Robert Love <[email protected]>
Cc: John McCutchan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2005-10-23 12:57:18 -07:00 • committed by Linus Torvalds
commit 8d3b35914a
3 changed files with 15 additions and 0 deletions
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13
lib/idr.c
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@ -345,6 +345,19 @@ void idr_remove(struct idr *idp, int id)
}
EXPORT_SYMBOL(idr_remove);
/**
* idr_destroy - release all cached layers within an idr tree
* idp: idr handle
*/
void idr_destroy(struct idr *idp)
{
while (idp->id_free_cnt) {
struct idr_layer *p = alloc_layer(idp);
kmem_cache_free(idr_layer_cache, p);
}
}
EXPORT_SYMBOL(idr_destroy);
/**
* idr_find - return pointer for given id
* @idp: idr handle