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From: Allison Henderson <allison.henderson@oracle.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH v16 08/28] xfsprogs: Check for extent overflow when adding/removing xattrs
Date: Thu, 25 Mar 2021 17:31:11 -0700	[thread overview]
Message-ID: <20210326003131.32642-9-allison.henderson@oracle.com> (raw)
In-Reply-To: <20210326003131.32642-1-allison.henderson@oracle.com>

From: Chandan Babu R <chandanrlinux@gmail.com>

Source kernel commit: 3a19bb147c72d2e9b77137bf5130b9cfb50a5eef

Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to be
added. One extra extent for dabtree in case a local attr is large enough
to cause a double split.  It can also cause extent count to increase
proportional to the size of a remote xattr's value.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 libxfs/xfs_attr.c       | 13 +++++++++++++
 libxfs/xfs_inode_fork.h | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 0c75f46..237f36b 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -396,6 +396,7 @@ xfs_attr_set(
 	struct xfs_trans_res	tres;
 	bool			rsvd = (args->attr_filter & XFS_ATTR_ROOT);
 	int			error, local;
+	int			rmt_blks = 0;
 	unsigned int		total;
 
 	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
@@ -442,11 +443,15 @@ xfs_attr_set(
 		tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
 		tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
 		total = args->total;
+
+		if (!local)
+			rmt_blks = xfs_attr3_rmt_blocks(mp, args->valuelen);
 	} else {
 		XFS_STATS_INC(mp, xs_attr_remove);
 
 		tres = M_RES(mp)->tr_attrrm;
 		total = XFS_ATTRRM_SPACE_RES(mp);
+		rmt_blks = xfs_attr3_rmt_blocks(mp, XFS_XATTR_SIZE_MAX);
 	}
 
 	/*
@@ -460,6 +465,14 @@ xfs_attr_set(
 
 	xfs_ilock(dp, XFS_ILOCK_EXCL);
 	xfs_trans_ijoin(args->trans, dp, 0);
+
+	if (args->value || xfs_inode_hasattr(dp)) {
+		error = xfs_iext_count_may_overflow(dp, XFS_ATTR_FORK,
+				XFS_IEXT_ATTR_MANIP_CNT(rmt_blks));
+		if (error)
+			goto out_trans_cancel;
+	}
+
 	if (args->value) {
 		unsigned int	quota_flags = XFS_QMOPT_RES_REGBLKS;
 
diff --git a/libxfs/xfs_inode_fork.h b/libxfs/xfs_inode_fork.h
index ea1a9dd..8d89838 100644
--- a/libxfs/xfs_inode_fork.h
+++ b/libxfs/xfs_inode_fork.h
@@ -61,6 +61,16 @@ struct xfs_ifork {
 	((XFS_DA_NODE_MAXDEPTH + 1 + 1) * (mp)->m_dir_geo->fsbcount)
 
 /*
+ * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
+ * be added. One extra extent for dabtree in case a local attr is
+ * large enough to cause a double split.  It can also cause extent
+ * count to increase proportional to the size of a remote xattr's
+ * value.
+ */
+#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
+	(XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
+
+/*
  * Fork handling.
  */
 
-- 
2.7.4


  parent reply	other threads:[~2021-03-26  0:32 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26  0:31 [PATCH v16 00/28] xfsprogs: Delay Ready Attributes Allison Henderson
2021-03-26  0:31 ` [PATCH v16 01/28] xfsprogs: fix an ABBA deadlock in xfs_rename Allison Henderson
2021-03-26  0:31 ` [PATCH v16 02/28] xfsprogs: Add helper for checking per-inode extent count overflow Allison Henderson
2021-03-26  0:31 ` [PATCH v16 03/28] xfsprogs: Check for extent overflow when trivally adding a new extent Allison Henderson
2021-03-26  0:31 ` [PATCH v16 04/28] xfsprogs: Check for extent overflow when punching a hole Allison Henderson
2021-03-26  0:31 ` [PATCH v16 05/28] xfsprogs: Check for extent overflow when adding dir entries Allison Henderson
2021-03-26  0:31 ` [PATCH v16 06/28] xfsprogs: Check for extent overflow when removing " Allison Henderson
2021-03-26  0:31 ` [PATCH v16 07/28] xfsprogs: Check for extent overflow when renaming " Allison Henderson
2021-03-26  0:31 ` Allison Henderson [this message]
2021-03-26  0:31 ` [PATCH v16 09/28] xfsprogs: Check for extent overflow when writing to unwritten extent Allison Henderson
2021-03-26  0:31 ` [PATCH v16 10/28] xfsprogs: Check for extent overflow when moving extent from cow to data fork Allison Henderson
2021-03-26  0:31 ` [PATCH v16 11/28] xfsprogs: Check for extent overflow when swapping extents Allison Henderson
2021-03-26  0:31 ` [PATCH v16 12/28] xfsprogs: Introduce error injection to reduce maximum inode fork extent count Allison Henderson
2021-03-26  0:31 ` [PATCH v16 13/28] xfsprogs: Remove duplicate assert statement in xfs_bmap_btalloc() Allison Henderson
2021-03-26  0:31 ` [PATCH v16 14/28] xfsprogs: Compute bmap extent alignments in a separate function Allison Henderson
2021-03-26  0:31 ` [PATCH v16 15/28] xfsprogs: Process allocated extent " Allison Henderson
2021-03-26  0:31 ` [PATCH v16 16/28] xfsprogs: Introduce error injection to allocate only minlen size extents for files Allison Henderson
2021-03-26  0:31 ` [PATCH v16 17/28] libxfs: expose inobtcount in xfs geometry Allison Henderson
2021-03-26  0:31 ` [PATCH v16 18/28] xfsprogs: Reverse apply 72b97ea40d Allison Henderson
2021-03-26  0:31 ` [PATCH v16 19/28] xfsprogs: Add xfs_attr_node_remove_cleanup Allison Henderson
2021-03-26  0:31 ` [PATCH v16 20/28] xfsprogs: Hoist xfs_attr_set_shortform Allison Henderson
2021-03-26  0:31 ` [PATCH v16 21/28] xfsprogs: Add helper xfs_attr_set_fmt Allison Henderson
2021-03-26  0:31 ` [PATCH v16 22/28] xfsprogs: Separate xfs_attr_node_addname and xfs_attr_node_addname_clear_incomplete Allison Henderson
2021-03-26  0:31 ` [PATCH v16 23/28] xfsprogs: Add helper xfs_attr_node_addname_find_attr Allison Henderson
2021-03-26  0:31 ` [PATCH v16 24/28] xfsprogs: Hoist xfs_attr_node_addname Allison Henderson
2021-03-26  0:31 ` [PATCH v16 25/28] xfsprogs: Hoist xfs_attr_leaf_addname Allison Henderson
2021-03-26  0:31 ` [PATCH v16 26/28] xfsprogs: Hoist node transaction handling Allison Henderson
2021-03-26  0:31 ` [PATCH v16 27/28] xfsprogs: Add delay ready attr remove routines Allison Henderson
2021-03-26  0:31 ` [PATCH v16 28/28] xfsprogs: Add delay ready attr set routines Allison Henderson

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