From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v14 15/74] xarray: Destroy an XArray Date: Sat, 16 Jun 2018 18:59:53 -0700 Message-ID: <20180617020052.4759-16-willy@infradead.org> References: <20180617020052.4759-1-willy@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=06qd/xlJg/OzH4I18kD3SK7TPii4ugk5m7Ua6YGXEhI=; b=iEvlSIqjcPG/ao11MF1p4MVwjc nQsybGQDhM6NNWti8M7u0ql4IFMQkZiSPA0Gipa+fvOry44UPVYjMINYyEXEYXzUksd2UG/Hcsjki ScNBQc9rGuqVpJdQyTEcwk7FOZapmxNMcu7wjDCKDQ/kkhR0TNFgAEasNp5UnD8/0Kd8=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To :MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=06qd/xlJg/OzH4I18kD3SK7TPii4ugk5m7Ua6YGXEhI=; b=MMJ5luBtEe6VGmG8+rYXeqLcZ4 gcmkyC4Ekk0+aklJWH6E6DBUIitJ13MqBCA0H5AzLI8T75OBXTpwhlXVgFArECuWctdTTidEzuORj HcUK/2RLqbXMYEdSMq6McRUfZewkBkrSjpkYUiLPtmHE6mIrOGACPpWiCc9gN6WtVOoI=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=06qd/xlJg/OzH4I18kD3SK7TPii4ugk5m7Ua6YGXEhI=; b=ZRmlSBK92lq0ByjszBgzabJBy aN+v+EI3JNlMVXilNUWIQFVrfnJW3WWV80YUVEOmF/MeDPK2aYwOmxGlpmgR0+CBwALn0TRsOSQgh YTgKc7CZvvGIwIDDu0udK860oheV4TKYTQnDcoNf33oPV0YMk9UgyVZLb3jQXD+4IRRf1Xu4hFtOC jUpEWOWfOkpnmczEkeOjirw7TGBaQAJa2U9NEV3kVWdiCcpRUpS3cx9Q3PWtu8r52SmaRSrIaWacN sKTeeRUK12AvQWdFXuJmVfN5VfAzTrrswe1Y05hw6yfj6JRdP5z/I9RX0W2HCPN/YR9KKqsof817B mpdXxOE4w==; In-Reply-To: <20180617020052.4759-1-willy@infradead.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-nilfs@vger.kernel.org, Jan Kara , Jeff Layton , Jaegeuk Kim , Matthew Wilcox , linux-f2fs-devel@lists.sourceforge.net, Nicholas Piggin , Ryusuke Konishi , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues This function frees all the internal memory allocated to the xarray and reinitialises it to be empty. Signed-off-by: Matthew Wilcox --- include/linux/xarray.h | 1 + lib/xarray.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/include/linux/xarray.h b/include/linux/xarray.h index 6f398732b664..fa36a0670988 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -229,6 +229,7 @@ void *xa_find_after(struct xarray *xa, unsigned long *index, unsigned long max, xa_tag_t) __attribute__((nonnull(2))); unsigned int xa_extract(struct xarray *, void **dst, unsigned long start, unsigned long max, unsigned int n, xa_tag_t); +void xa_destroy(struct xarray *); /** * xa_init() - Initialise an empty XArray. diff --git a/lib/xarray.c b/lib/xarray.c index 1e15ead40d78..e90ba76404ae 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1493,6 +1493,34 @@ unsigned int xa_extract(struct xarray *xa, void **dst, unsigned long start, } EXPORT_SYMBOL(xa_extract); +/** + * xa_destroy() - Free all internal data structures. + * @xa: XArray. + * + * After calling this function, the XArray is empty and has freed all memory + * allocated for its internal data structures. You are responsible for + * freeing the objects referenced by the XArray. + * + * Context: Any context. Takes and releases the xa_lock, interrupt-safe. + */ +void xa_destroy(struct xarray *xa) +{ + XA_STATE(xas, xa, 0); + unsigned long flags; + void *entry; + + xas.xa_node = NULL; + xas_lock_irqsave(&xas, flags); + entry = xa_head_locked(xa); + RCU_INIT_POINTER(xa->xa_head, NULL); + xas_init_tags(&xas); + /* lockdep checks we're still holding the lock in xas_free_nodes() */ + if (xa_is_node(entry)) + xas_free_nodes(&xas, xa_to_node(entry)); + xas_unlock_irqrestore(&xas, flags); +} +EXPORT_SYMBOL(xa_destroy); + #ifdef XA_DEBUG void xa_dump_node(const struct xa_node *node) { -- 2.17.1 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot