From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v11 12/63] xarray: Add xa_destroy Date: Sat, 14 Apr 2018 07:12:25 -0700 Message-ID: <20180414141316.7167-13-willy@infradead.org> References: <20180414141316.7167-1-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=RC94tGwStOAQ8OQVd88LSFCJfzvU0y2ZBRH1em9h4/g=; b=ih2RYkD//DDDUn5kWmmp4w9TyK i1jyvZki6j/PzrjonNAVw2FIgoG+IceI9yNFV5gF59E+kwIpkHBi+MmfPgTHoJ2Q2MJasJ4seqRb9 NhKrovqOEVegFk35kJ7N3iYAghT0HQgMBlw7Xs5V+9H0cgso/vMH4P+z2UupvU+YbU8E=; 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=RC94tGwStOAQ8OQVd88LSFCJfzvU0y2ZBRH1em9h4/g=; b=SLi/fnZs8V+e6v7aZqHdy+HCpa 6UNtTJpkmlxo18DMLXXiHvYo7/7+u2YdsOYei9ADaHlYO/SeL+yr2q5j/zzTe8BkwKGgD6I6Lkinj 5RMZUMKxvLTEwoYxa61F3Gmr2QIe/YaTpt1Nf8YSaT+LzD/1/uljmmHp9VSWdlRbKLoA=; 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=RC94tGwStOAQ8OQVd88LSFCJfzvU0y2ZBRH1em9h4/g=; b=US+O3qrIacupYgosX+NZr1k6w 0+v9oT/EakDN4nn8zBS/otvFCqKK/qGNIzrezBr6RvGVnhQjrWuqz/qxEQDH4wefLaLIAiTPmzWOj lc5B5JvY1Qmp/FsXRpNMZI+mi8WV5EC0NrcRo6fr/jDgOt241It2R286+cBEXXtr8l6JP+CeaBtMV A3Iwcp8NFWE+cfPd3cbVksV4uyHvosBzn0uoemnx5ObftyxYf38jIin8LZnJxzbTm0EnhIc4bhVNI +Pvq0+mCNISds54mzTIc+PLfY5wPPjRcSCUnYFwo/qhyrYGXxXgrZz5MR2wYAkA75NoCiMqhZO68w kouWV+8aA==; In-Reply-To: <20180414141316.7167-1-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 Cc: linux-nilfs@vger.kernel.org, Jan Kara , Jeff Layton , Matthew Wilcox , James Simmons , Jaegeuk Kim , Andreas Dilger , Nicholas Piggin , linux-f2fs-devel@lists.sourceforge.net, Oleg Drokin , Ryusuke Konishi , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues , Mike Kravetz From: Matthew Wilcox 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 4ee606957019..00f74b962def 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 77133bc5419f..940d22d8e76c 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1482,6 +1482,34 @@ 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) { -- 2.17.0 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot