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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org, xfs@oss.sgi.com
Subject: [PATCH 59/71] xfs_repair: fix get_agino_buf to avoid corrupting inodes
Date: Thu, 25 Aug 2016 16:52:56 -0700	[thread overview]
Message-ID: <147216917625.4420.10924742973800299704.stgit@birch.djwong.org> (raw)
In-Reply-To: <147216879156.4420.2446767701729565218.stgit@birch.djwong.org>

The inode buffering code tries to read inodes in units of chunks,
which are the larger of 8K or 1 FSB.  Each chunk gets its own xfs_buf,
which means that get_agino_buf must calculate the disk address of the
chunk and feed that to libxfs_readbuf in order to find the inode data
correctly.  The current code simply grabs the chunk for the start
inode and indexes from that, which corrupts memory because the start
inode and the target inode could be in different inode chunks.  That
causes the assert in rmap.c to blow when we clear the reflink flag.

(Also fix some minor errors in the debugging printfs.)

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 libxfs/rdwr.c   |    8 +++---
 repair/dinode.c |   73 +++++++++++++++++++++++++++++++++----------------------
 repair/dinode.h |   12 +++++----
 3 files changed, 54 insertions(+), 39 deletions(-)


diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index 533a064..9fcc319 100644
--- a/libxfs/rdwr.c
+++ b/libxfs/rdwr.c
@@ -1038,9 +1038,9 @@ libxfs_readbufr_map(struct xfs_buftarg *btp, struct xfs_buf *bp, int flags)
 	if (!error)
 		bp->b_flags |= LIBXFS_B_UPTODATE;
 #ifdef IO_DEBUG
-	printf("%lx: %s: read %u bytes, error %d, blkno=0x%llx(0x%llx), %p\n",
-		pthread_self(), __FUNCTION__, , error,
-		(long long)LIBXFS_BBTOOFF64(blkno), (long long)blkno, bp);
+	printf("%lx: %s: read %lu bytes, error %d, blkno=%llu(%llu), %p\n",
+		pthread_self(), __FUNCTION__, buf - (char *)bp->b_addr, error,
+		(long long)LIBXFS_BBTOOFF64(bp->b_bn), (long long)bp->b_bn, bp);
 #endif
 	return error;
 }
@@ -1070,7 +1070,7 @@ libxfs_readbuf_map(struct xfs_buftarg *btp, struct xfs_buf_map *map, int nmaps,
 	if (!error)
 		libxfs_readbuf_verify(bp, ops);
 
-#ifdef IO_DEBUG
+#ifdef IO_DEBUGX
 	printf("%lx: %s: read %lu bytes, error %d, blkno=%llu(%llu), %p\n",
 		pthread_self(), __FUNCTION__, buf - (char *)bp->b_addr, error,
 		(long long)LIBXFS_BBTOOFF64(bp->b_bn), (long long)bp->b_bn, bp);
diff --git a/repair/dinode.c b/repair/dinode.c
index 512a668..16e0a06 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -847,43 +847,58 @@ scan_bmbt_reclist(
 }
 
 /*
- * these two are meant for routines that read and work with inodes
- * one at a time where the inodes may be in any order (like walking
- * the unlinked lists to look for inodes).  the caller is responsible
- * for writing/releasing the buffer.
+ * Grab the buffer backing an inode.  This is meant for routines that
+ * work with inodes one at a time in any order (like walking the
+ * unlinked lists to look for inodes).  The caller is responsible for
+ * writing/releasing the buffer.
  */
-xfs_buf_t *
-get_agino_buf(xfs_mount_t	 *mp,
-		xfs_agnumber_t	agno,
-		xfs_agino_t	agino,
-		xfs_dinode_t	**dipp)
+struct xfs_buf *
+get_agino_buf(
+	struct xfs_mount	*mp,
+	xfs_agnumber_t		agno,
+	xfs_agino_t		agino,
+	struct xfs_dinode	**dipp)
 {
-	ino_tree_node_t *irec;
-	xfs_buf_t *bp;
-	int size;
-
-	if ((irec = find_inode_rec(mp, agno, agino)) == NULL)
-		return(NULL);
+	struct xfs_buf		*bp;
+	int			cluster_size;
+	int			ino_per_cluster;
+	xfs_agino_t		cluster_agino;
+	xfs_daddr_t		cluster_daddr;
+	xfs_daddr_t		cluster_blks;
 
-	size = MAX(1, XFS_FSB_TO_BB(mp,
+	/*
+	 * Inode buffers have been read into memory in inode_cluster_size
+	 * chunks (or one FSB).  To find the correct buffer for an inode,
+	 * we must find the buffer for its cluster, add the appropriate
+	 * offset, and return that.
+	 */
+	cluster_size = MAX(mp->m_inode_cluster_size, mp->m_sb.sb_blocksize);
+	ino_per_cluster = cluster_size / mp->m_sb.sb_inodesize;
+	cluster_agino = agino & ~(ino_per_cluster - 1);
+	cluster_blks = XFS_FSB_TO_DADDR(mp, MAX(1,
 			mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog));
-	bp = libxfs_readbuf(mp->m_dev, XFS_AGB_TO_DADDR(mp, agno,
-		XFS_AGINO_TO_AGBNO(mp, irec->ino_startnum)), size, 0,
-		&xfs_inode_buf_ops);
+	cluster_daddr = XFS_AGB_TO_DADDR(mp, agno,
+			XFS_AGINO_TO_AGBNO(mp, cluster_agino));
+
+#ifdef XR_INODE_TRACE
+	printf("cluster_size %d ipc %d clusagino %d daddr %lld sectors %lld\n",
+		cluster_size, ino_per_cluster, cluster_agino, cluster_daddr,
+		cluster_blks);
+#endif
+
+	bp = libxfs_readbuf(mp->m_dev, cluster_daddr, cluster_blks,
+			0, &xfs_inode_buf_ops);
 	if (!bp) {
 		do_warn(_("cannot read inode (%u/%u), disk block %" PRIu64 "\n"),
-			agno, irec->ino_startnum,
-			XFS_AGB_TO_DADDR(mp, agno,
-				XFS_AGINO_TO_AGBNO(mp, irec->ino_startnum)));
-		return(NULL);
+			agno, cluster_agino, cluster_daddr);
+		return NULL;
 	}
 
-	*dipp = xfs_make_iptr(mp, bp, agino -
-		XFS_OFFBNO_TO_AGINO(mp, XFS_AGINO_TO_AGBNO(mp,
-						irec->ino_startnum),
-		0));
-
-	return(bp);
+	*dipp = xfs_make_iptr(mp, bp, agino - cluster_agino);
+	ASSERT(!xfs_sb_version_hascrc(&mp->m_sb) ||
+			XFS_AGINO_TO_INO(mp, agno, agino) ==
+			be64_to_cpu((*dipp)->di_ino));
+	return bp;
 }
 
 /*
diff --git a/repair/dinode.h b/repair/dinode.h
index 5aebf5b..61d0736 100644
--- a/repair/dinode.h
+++ b/repair/dinode.h
@@ -113,12 +113,12 @@ void
 check_uncertain_aginodes(xfs_mount_t	*mp,
 			xfs_agnumber_t	agno);
 
-xfs_buf_t *
-get_agino_buf(xfs_mount_t	*mp,
-		xfs_agnumber_t	agno,
-		xfs_agino_t	agino,
-		xfs_dinode_t	**dipp);
-
+struct xfs_buf *
+get_agino_buf(
+	struct xfs_mount	*mp,
+	xfs_agnumber_t		agno,
+	xfs_agino_t		agino,
+	struct xfs_dinode	**dipp);
 
 void dinode_bmbt_translation_init(void);
 char * get_forkname(int whichfork);

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  parent reply	other threads:[~2016-08-25 23:53 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-25 23:46 [PATCH v8 00/71] xfsprogs: add reflink and dedupe support Darrick J. Wong
2016-08-25 23:46 ` [PATCH 01/71] xfs: remove xfs_btree_bigkey Darrick J. Wong
2016-08-25 23:46 ` [PATCH 02/71] xfs: create a standard btree size calculator code Darrick J. Wong
2016-08-25 23:46 ` [PATCH 03/71] xfs: count the blocks in a btree Darrick J. Wong
2016-08-25 23:46 ` [PATCH 04/71] xfs: defer should allow ->finish_item to request a new transaction Darrick J. Wong
2016-08-25 23:47 ` [PATCH 05/71] xfs: set up per-AG free space reservations Darrick J. Wong
2016-08-25 23:47 ` [PATCH 06/71] xfs: introduce refcount btree definitions Darrick J. Wong
2016-08-25 23:47 ` [PATCH 07/71] xfs: add refcount btree stats infrastructure Darrick J. Wong
2016-08-25 23:47 ` [PATCH 08/71] xfs: refcount btree add more reserved blocks Darrick J. Wong
2016-08-25 23:47 ` [PATCH 09/71] xfs: define the on-disk refcount btree format Darrick J. Wong
2016-08-25 23:47 ` [PATCH 10/71] xfs: account for the refcount btree in the alloc/free log reservation Darrick J. Wong
2016-08-25 23:47 ` [PATCH 11/71] xfs: add refcount btree operations Darrick J. Wong
2016-08-25 23:47 ` [PATCH 12/71] xfs: create refcount update intent log items Darrick J. Wong
2016-08-25 23:47 ` [PATCH 13/71] xfs: log refcount intent items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 14/71] xfs: adjust refcount of an extent of blocks in refcount btree Darrick J. Wong
2016-08-25 23:48 ` [PATCH 15/71] xfs: connect refcount adjust functions to upper layers Darrick J. Wong
2016-08-25 23:48 ` [PATCH 16/71] xfs: adjust refcount when unmapping file blocks Darrick J. Wong
2016-08-25 23:48 ` [PATCH 17/71] xfs: refcount btree requires more reserved space Darrick J. Wong
2016-08-25 23:48 ` [PATCH 18/71] xfs: introduce reflink utility functions Darrick J. Wong
2016-08-25 23:48 ` [PATCH 19/71] xfs: create bmbt update intent log items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 20/71] xfs: log bmap intent items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 21/71] xfs: map an inode's offset to an exact physical block Darrick J. Wong
2016-08-25 23:48 ` [PATCH 22/71] xfs: pass bmapi flags through to bmap_del_extent Darrick J. Wong
2016-08-25 23:48 ` [PATCH 23/71] xfs: implement deferred bmbt map/unmap operations Darrick J. Wong
2016-08-25 23:49 ` [PATCH 24/71] xfs: return work remaining at the end of a bunmapi operation Darrick J. Wong
2016-08-25 23:49 ` [PATCH 25/71] xfs: add reflink feature flag to geometry Darrick J. Wong
2016-08-25 23:49 ` [PATCH 26/71] xfs: don't allow reflinked dir/dev/fifo/socket/pipe files Darrick J. Wong
2016-08-25 23:49 ` [PATCH 27/71] xfs: introduce the CoW fork Darrick J. Wong
2016-08-25 23:49 ` [PATCH 28/71] xfs: support bmapping delalloc extents in " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 29/71] xfs: support allocating delayed extents in " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 30/71] xfs: support removing extents from " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 31/71] xfs: store in-progress CoW allocations in the refcount btree Darrick J. Wong
2016-08-25 23:49 ` [PATCH 32/71] xfs: teach get_bmapx and fiemap about shared extents and the CoW fork Darrick J. Wong
2016-08-25 23:50 ` [PATCH 33/71] xfs: support FS_XFLAG_REFLINK on reflink filesystems Darrick J. Wong
2016-08-25 23:50 ` [PATCH 34/71] xfs: create a separate cow extent size hint for the allocator Darrick J. Wong
2016-08-25 23:50 ` [PATCH 35/71] xfs: preallocate blocks for worst-case btree expansion Darrick J. Wong
2016-08-25 23:50 ` [PATCH 36/71] xfs: try other AGs to allocate a BMBT block Darrick J. Wong
2016-08-25 23:50 ` [PATCH 37/71] xfs: increase log reservations for reflink Darrick J. Wong
2016-08-25 23:50 ` [PATCH 38/71] xfs: add shared rmap map/unmap/convert log item types Darrick J. Wong
2016-08-25 23:50 ` [PATCH 39/71] xfs: use interval query for rmap map and unmap operations on shared files Darrick J. Wong
2016-08-25 23:50 ` [PATCH 40/71] xfs: convert unwritten status of shared-extent reverse mappings " Darrick J. Wong
2016-08-25 23:50 ` [PATCH 41/71] xfs: don't allow realtime and reflinked files to mix Darrick J. Wong
2016-08-25 23:51 ` [PATCH 42/71] xfs: don't mix reflink and DAX mode for now Darrick J. Wong
2016-08-25 23:51 ` [PATCH 43/71] xfs: recognize the reflink feature bit Darrick J. Wong
2016-08-25 23:51 ` [PATCH 44/71] xfs_db: dump refcount btree data Darrick J. Wong
2016-08-25 23:51 ` [PATCH 45/71] xfs_db: add support for checking the refcount btree Darrick J. Wong
2016-08-25 23:51 ` [PATCH 46/71] xfs_db: metadump should copy the refcount btree too Darrick J. Wong
2016-08-25 23:51 ` [PATCH 47/71] xfs_db: deal with the CoW extent size hint Darrick J. Wong
2016-08-25 23:51 ` [PATCH 48/71] xfs_db: print one array element per line Darrick J. Wong
2016-08-25 23:51 ` [PATCH 49/71] xfs_growfs: report the presence of the reflink feature Darrick J. Wong
2016-08-25 23:51 ` [PATCH 50/71] xfs_io: bmap should support querying CoW fork, shared blocks Darrick J. Wong
2016-08-25 23:52 ` [PATCH 51/71] libxfs: add configure option to override system header fsxattr Darrick J. Wong
2016-08-25 23:52 ` [PATCH 52/71] xfs_io: get and set the CoW extent size hint Darrick J. Wong
2016-08-25 23:52 ` [PATCH 53/71] xfs_io: add refcount+bmap error injection types Darrick J. Wong
2016-08-25 23:52 ` [PATCH 54/71] xfs_logprint: support cowextsize reporting in log contents Darrick J. Wong
2016-08-25 23:52 ` [PATCH 55/71] xfs_logprint: support refcount redo items Darrick J. Wong
2016-08-25 23:52 ` [PATCH 56/71] xfs_logprint: support bmap " Darrick J. Wong
2016-08-25 23:52 ` [PATCH 57/71] man: document the reflink inode flag in fsxattr Darrick J. Wong
2016-08-25 23:52 ` [PATCH 58/71] man: document the inode cowextsize flags & fields Darrick J. Wong
2016-08-25 23:52 ` Darrick J. Wong [this message]
2016-08-25 23:53 ` [PATCH 60/71] xfs_repair: check the existing refcount btree Darrick J. Wong
2016-08-25 23:53 ` [PATCH 61/71] xfs_repair: handle multiple owners of data blocks Darrick J. Wong
2016-08-25 23:53 ` [PATCH 62/71] xfs_repair: process reverse-mapping data into refcount data Darrick J. Wong
2016-08-25 23:53 ` [PATCH 63/71] xfs_repair: record reflink inode state Darrick J. Wong
2016-08-25 23:53 ` [PATCH 64/71] xfs_repair: fix inode reflink flags Darrick J. Wong
2016-08-25 23:53 ` [PATCH 65/71] xfs_repair: check the refcount btree against our observed reference counts when -n Darrick J. Wong
2016-08-25 23:53 ` [PATCH 66/71] xfs_repair: rebuild the refcount btree Darrick J. Wong
2016-08-25 23:53 ` [PATCH 67/71] xfs_repair: complain about copy-on-write leftovers Darrick J. Wong
2016-08-25 23:53 ` [PATCH 68/71] xfs_repair: check the CoW extent size hint Darrick J. Wong
2016-08-25 23:54 ` [PATCH 69/71] xfs_repair: use range query when while checking rmaps Darrick J. Wong
2016-08-25 23:54 ` [PATCH 70/71] xfs_repair: check for mergeable refcount records Darrick J. Wong
2016-08-25 23:54 ` [PATCH 71/71] mkfs.xfs: format reflink enabled filesystems Darrick J. Wong

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