From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v13 14/72] xarray: Add xa_destroy Date: Mon, 11 Jun 2018 07:05:41 -0700 Message-ID: <20180611140639.17215-15-willy@infradead.org> References: <20180611140639.17215-1-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=nbY05u5jx+2zgCzyQJUXznqPWLWRJUQUQdOdMyGJxM0=; b=MC/gTfqz52OYEptUTmXBQl/X0b 4nsncNytAcYW5867126RfhZISO+zYVxggRiPUogjmWt6tEc4c/E3H3WcsG43Oj2vWvi1gyrw50s/e u16/BgGphQAMhIqpYCPKwq/bw939y8I7C42VIqGK39Pm0AMpmeQReYSSH8qV4oGEu+6Y=; 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=nbY05u5jx+2zgCzyQJUXznqPWLWRJUQUQdOdMyGJxM0=; b=Z3Sh8kL/r/vkCsXgYSWZxC/Gps AfP0RzI4mJHT19trpEbCWfpWypwwfLw3ScQJmERt9RxFPfUZSYQTHj3ts7BzyxKw8PLPZd4fVwLJf Vu/N7gvy0siNleMi1EHEWo8ekIWA+VccEr6CtPKTP4cqvR7zPtKf9vni0K6/qda/KxT8=; 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=nbY05u5jx+2zgCzyQJUXznqPWLWRJUQUQdOdMyGJxM0=; b=g/V8+PfoP8BltXy7w9VxGblMc bHxjfhX2P31FEMyWo9VMWyvAnNJNnZVUCjyZovcJw03DPkveKbIBNwpsX6ujCgnKZ9v/50TyDJtPh yxMElhWR1fnHBSInlF1ezsyQwQ7imvbb+tyup3agX8SistDby+PvtlYAUa0IY1/YQgLxZWhP0bn1c YgxIwj6HIKAGafE1yEuomIXBO3rl99flAOwx2u9zupkAQDVKkI1I1iJp0Vhz9CYWuF+RTJjl7ppHh Y9LOKwxJ/tc5zJEnOpp2pCG5vRHGHReR4laDC44DPiq7QDBSQv4UHEGv126D2cC7p1Mp296YHITuH NasiHLpoQ==; In-Reply-To: <20180611140639.17215-1-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 , Matthew Wilcox , Jaegeuk Kim , Nicholas Piggin , linux-f2fs-devel@lists.sourceforge.net, Ryusuke Konishi , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues 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 3764f4b4c1a8..6273dd222fda 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 c3a53f09aa88..c505084ad43a 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1507,6 +1507,34 @@ 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