[PATCH V4 RESEND 4/7] xfs: Introduce struct xfs_attr_set_resv

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The intermediate numbers calculated by xfs_attr_calc_size() will be needed by
a future commit to correctly calculate log reservation for xattr set
operation. Towards this goal, this commit introduces 'struct
xfs_attr_set_resv' to collect,
1. Number of dabtree blocks.
2. Number of remote blocks.
3. Number of Bmbt blocks.
4. Total number of blocks we need to reserve.

This will be returned as an out argument by xfs_attr_calc_size().

Signed-off-by: Chandan Rajendra <chandanrlinux@xxxxxxxxx>
---
 fs/xfs/libxfs/xfs_attr.c | 50 ++++++++++++++++++++++------------------
 fs/xfs/libxfs/xfs_attr.h | 13 +++++++++++
 2 files changed, 40 insertions(+), 23 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index a708b142f69b6..921acac71e5d9 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -136,16 +136,14 @@ xfs_attr_get(
 /*
  * Calculate how many blocks we need for the new attribute,
  */
-STATIC int
+STATIC void
 xfs_attr_calc_size(
-	struct xfs_da_args	*args,
-	int			*local)
+	struct xfs_da_args		*args,
+	struct xfs_attr_set_resv	*resv,
+	int				*local)
 {
-	struct xfs_mount	*mp = args->dp->i_mount;
-	unsigned int		total_dablks;
-	unsigned int		bmbt_blks;
-	unsigned int		rmt_blks;
-	int			size;
+	struct xfs_mount		*mp = args->dp->i_mount;
+	int				size;
 
 	/*
 	 * Determine space new attribute will use, and if it would be
@@ -153,25 +151,27 @@ xfs_attr_calc_size(
 	 */
 	size = xfs_attr_leaf_newentsize(args->geo, args->namelen,
 			args->valuelen, local);
-	total_dablks = XFS_DAENTER_BLOCKS(mp, XFS_ATTR_FORK);
+	resv->total_dablks = XFS_DAENTER_BLOCKS(mp, XFS_ATTR_FORK);
 	if (*local) {
 		if (size > (args->geo->blksize / 2)) {
 			/* Double split possible */
-			total_dablks *= 2;
+			resv->total_dablks *= 2;
 		}
-		rmt_blks = 0;
+		resv->rmt_blks = 0;
 	} else {
 		/*
 		 * Out of line attribute, cannot double split, but
 		 * make room for the attribute value itself.
 		 */
-		rmt_blks = xfs_attr3_rmt_blocks(mp, args->valuelen);
+		resv->rmt_blks = xfs_attr3_rmt_blocks(mp, args->valuelen);
 	}
 
-	bmbt_blks = XFS_NEXTENTADD_SPACE_RES(mp, total_dablks + rmt_blks,
-			XFS_ATTR_FORK);
+	resv->bmbt_blks = XFS_NEXTENTADD_SPACE_RES(mp,
+				resv->total_dablks + resv->rmt_blks,
+				XFS_ATTR_FORK);
 
-	return total_dablks + rmt_blks + bmbt_blks;
+	resv->alloc_blks = resv->total_dablks + resv->rmt_blks +
+		resv->bmbt_blks;
 }
 
 STATIC int
@@ -295,14 +295,17 @@ xfs_attr_remove_args(
  */
 int
 xfs_attr_set(
-	struct xfs_da_args	*args)
+	struct xfs_da_args		*args)
 {
-	struct xfs_inode	*dp = args->dp;
-	struct xfs_mount	*mp = dp->i_mount;
-	struct xfs_trans_res	tres;
-	bool			rsvd = (args->attr_namespace & XFS_ATTR_ROOT);
-	int			error, local;
-	unsigned int		total;
+	struct xfs_inode		*dp = args->dp;
+	struct xfs_mount		*mp = dp->i_mount;
+	struct xfs_attr_set_resv	resv;
+	struct xfs_trans_res		tres;
+	bool				rsvd;
+	int				error, local;
+	unsigned int			total;
+
+	rsvd = (args->attr_namespace & XFS_ATTR_ROOT);
 
 	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 		return -EIO;
@@ -326,7 +329,8 @@ xfs_attr_set(
 		XFS_STATS_INC(mp, xs_attr_set);
 
 		args->op_flags |= XFS_DA_OP_ADDNAME;
-		args->total = xfs_attr_calc_size(args, &local);
+		xfs_attr_calc_size(args, &resv, &local);
+		args->total = resv.alloc_blks;
 
 		/*
 		 * If the inode doesn't have an attribute fork, add one.
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 861c81f9bb918..dc08bdfbc9615 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -73,6 +73,19 @@ struct xfs_attr_list_context {
 	int			index;		/* index into output buffer */
 };
 
+struct xfs_attr_set_resv {
+	/* Number of unlogged blocks needed to store the remote attr value. */
+	unsigned int		rmt_blks;
+
+	/* Number of filesystem blocks to allocate for the da btree. */
+	unsigned int		total_dablks;
+
+	/* Blocks we might need to create all the new attr fork mappings. */
+	unsigned int		bmbt_blks;
+
+	/* Total number of blocks we might have to allocate. */
+	unsigned int		alloc_blks;
+};
 
 /*========================================================================
  * Function prototypes for the kernel.
-- 
2.19.1




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