From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v9 22/61] xarray: Add xas_create_range Date: Tue, 13 Mar 2018 06:26:00 -0700 Message-ID: <20180313132639.17387-23-willy@infradead.org> References: <20180313132639.17387-1-willy@infradead.org> Return-path: 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=5DGecaPqz+MyuZZNxvRv/n4mcETcUg6v7sGnAIwI8ng=; b=rxENiFlzqBWlS9LOkSkE/+FBX k1xu8tCIROhPKx/ZWzP6Cxo6POGMcLuX/6aFqAtN6E1yDlz4GkXxX3kIn9KmDex7qAG5yJmSXTYAs crqA9wvWkbnb2F9z/PCOPiSFvsfR1PEHHwIU4GtXm4ZpdLvt6n9BYmPqc5/Y233HNBf22Nii09vjy IQeIbFG/gLcHbMsIUmbrz8mNVnUx44uVaZINvwyhOkPoh7foxSNiCC8GvW0Q5zQ17zrTBYeqAeHZv csaC8e1C8tF2pVC88+Yk6gtWyRXv5vzXsVUTDDfwqZLbPhwK3v5C3A0i1tsanq1vJBn7EGsmmA4PF In-Reply-To: <20180313132639.17387-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Andrew Morton Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Ryusuke Konishi , linux-nilfs@vger.kernel.org From: Matthew Wilcox This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox --- include/linux/xarray.h | 2 ++ lib/xarray.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/linux/xarray.h b/include/linux/xarray.h index c8a0ddc1b3df..387be18d05ba 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -744,6 +744,8 @@ void xas_init_tags(const struct xa_state *); bool xas_nomem(struct xa_state *, gfp_t); void xas_pause(struct xa_state *); +void xas_create_range(struct xa_state *, unsigned long max); + /** * xas_reload() - Refetch an entry from the xarray. * @xas: XArray operation state. diff --git a/lib/xarray.c b/lib/xarray.c index 7cf195b6e740..1d94ecc2dca3 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -612,6 +612,28 @@ void *xas_create(struct xa_state *xas) } EXPORT_SYMBOL_GPL(xas_create); +/** + * xas_create_range() - Ensure that stores to this range will succeed + * @xas: XArray operation state. + * @max: The highest index to create a slot for. + * + * Creates all of the slots in the range between the current position of + * @xas and @max. This is for the benefit of users who have not yet been + * converted to multi-index entries. + * + * The implementation is naive. + */ +void xas_create_range(struct xa_state *xas, unsigned long max) +{ + XA_STATE(tmp, xas->xa, xas->xa_index); + + do { + xas_create(&tmp); + xas_set(&tmp, tmp.xa_index + XA_CHUNK_SIZE); + } while (tmp.xa_index < max); +} +EXPORT_SYMBOL_GPL(xas_create_range); + static void store_siblings(struct xa_state *xas, void *entry, void *curr, int *countp, int *valuesp) { -- 2.16.1