From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 0D6E97F50 for ; Thu, 24 Jul 2014 10:16:14 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay2.corp.sgi.com (Postfix) with ESMTP id C5B7E30405F for ; Thu, 24 Jul 2014 08:16:10 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id xziAgKnllxeOb3YL (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Thu, 24 Jul 2014 08:16:09 -0700 (PDT) Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s6OFG8MB020274 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 24 Jul 2014 11:16:08 -0400 Received: from bfoster.bfoster ([10.18.41.237]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s6OENAdt017005 for ; Thu, 24 Jul 2014 10:23:10 -0400 From: Brian Foster Subject: [PATCH 05/18] xfs: create macros/helpers for dealing with sparse inode chunks Date: Thu, 24 Jul 2014 10:22:55 -0400 Message-Id: <1406211788-63206-6-git-send-email-bfoster@redhat.com> In-Reply-To: <1406211788-63206-1-git-send-email-bfoster@redhat.com> References: <1406211788-63206-1-git-send-email-bfoster@redhat.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Sparse inode chunks allow the traditional inode btree record format to describe an inode chunk that is not fully allocated and/or contiguous. Define a couple constants that set requirements for allocation and management of such chunks. Also define a helper to easily detect sparse inode chunks. The granularity of a sparse chunk is defined by the the 16-bit holemask field in the inode record. Assuming 64 inodes per full chunk, a single holemask bit accounts for 4 inodes. The minimum allocation requirement for a sparse inode chunk is defined as the minimum number of blocks required to meet the 4 inode granularity. Signed-off-by: Brian Foster --- fs/xfs/libxfs/xfs_format.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 39022d9..0baad50 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -211,6 +211,11 @@ typedef __uint64_t xfs_inofree_t; #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) +#define XFS_INODES_PER_SPCHUNK \ + (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) +#define XFS_INOBT_MIN_SPCHUNKLEN(sb) \ + (roundup(XFS_INODES_PER_SPCHUNK, sb.sb_inopblock) / sb.sb_inopblock) + static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) { return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; @@ -234,6 +239,10 @@ typedef struct xfs_inobt_rec_incore { xfs_inofree_t ir_free; /* free inode mask */ } xfs_inobt_rec_incore_t; +static inline bool xfs_inobt_issparse(struct xfs_inobt_rec_incore *rec) +{ + return rec->ir_holemask == 0 ? false : true; +} /* * Key structure -- 1.8.3.1 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs