From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Matthew Wilcox To: linux-kernel@vger.kernel.org Cc: Matthew Wilcox , Ross Zwisler , David Howells , Shaohua Li , Jens Axboe , Rehas Sachdeva , Marc Zyngier , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, linux-raid@vger.kernel.org Subject: [PATCH v5 17/78] xarray: Add xa_destroy Date: Fri, 15 Dec 2017 14:03:49 -0800 Message-Id: <20171215220450.7899-18-willy@infradead.org> In-Reply-To: <20171215220450.7899-1-willy@infradead.org> References: <20171215220450.7899-1-willy@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: 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 | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/xarray.h b/include/linux/xarray.h index 1367d694eebd..fea81383a301 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -77,6 +77,7 @@ void *xa_load(struct xarray *, unsigned long index); void *xa_store(struct xarray *, unsigned long index, void *entry, gfp_t); void *xa_cmpxchg(struct xarray *, unsigned long index, void *old, void *entry, gfp_t); +void xa_destroy(struct xarray *); /** * xa_erase() - Erase this entry from the XArray. diff --git a/lib/xarray.c b/lib/xarray.c index e73ae7b57fc9..a51fa1e1f74f 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1418,6 +1418,31 @@ int xa_get_tagged(struct xarray *xa, void **dst, unsigned long start, } EXPORT_SYMBOL(xa_get_tagged); +/** + * 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. + */ +void xa_destroy(struct xarray *xa) +{ + XA_STATE(xas, xa, 0); + void *entry; + + xas.xa_node = NULL; + xa_lock(xa); + 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)); + xa_unlock(xa); +} +EXPORT_SYMBOL(xa_destroy); + #ifdef XA_DEBUG void xa_dump_node(const struct xa_node *node) { -- 2.15.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org