[PATCH V4 1/7] xfs: Pass xattr name and value length explicitly to xfs_attr_leaf_newentsize

[Chandan Rajendra <chandanrlinux@gmail.com>]

This commit changes xfs_attr_leaf_newentsize() to explicitly accept name and
value length instead of a pointer to struct xfs_da_args. A future commit will
need to invoke xfs_attr_leaf_newentsize() from functions that do not have
a struct xfs_da_args to pass in.

Signed-off-by: Chandan Rajendra <chandanrlinux@gmail.com>
---

Changelog:
V1 -> V2:
1. Use convenience variables to reduce indentation of code.

V2 -> V3:
1. Introduce 'struct xfs_attr_set_resv' to collect various block size
   reservations when inserting an xattr.
2. Add xfs_calc_attr_res() to calculate the total log reservation to
   required when inserting an xattr.

V3 -> V4:
1. Rebase the patchset on top of Christoph's "Clean attr interface"
   patchset. The patchset can be obtained from
   https://github.com/chandanr/linux/tree/xfs-fix-attr-resv-calc-v4.
2. Split the patchset into
   - Patches which refactor the existing calculation in
     xfs_attr_calc_size().
   - One patch which fixes the calculation inside
     xfs_attr_calc_size().
3. Fix indentation issues.
4. Pass attribute geometry pointer to xfs_attr_leaf_newentsize()
   instead of a pointer to xfs_mount.
   
 libxfs/xfs_attr.c      |  3 ++-
 libxfs/xfs_attr_leaf.c | 39 ++++++++++++++++++++++++++-------------
 libxfs/xfs_attr_leaf.h |  3 ++-
 3 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index b57c7080..e67d2eef 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -149,7 +149,8 @@ xfs_attr_calc_size(
 	 * Determine space new attribute will use, and if it would be
 	 * "local" or "remote" (note: local != inline).
 	 */
-	size = xfs_attr_leaf_newentsize(args, local);
+	size = xfs_attr_leaf_newentsize(args->geo, args->namelen,
+			args->valuelen, local);
 	nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
 	if (*local) {
 		if (size > (args->geo->blksize / 2)) {
diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c
index 9088640f..8e78cd3b 100644
--- a/libxfs/xfs_attr_leaf.c
+++ b/libxfs/xfs_attr_leaf.c
@@ -1326,7 +1326,8 @@ xfs_attr3_leaf_add(
 	leaf = bp->b_addr;
 	xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
 	ASSERT(args->index >= 0 && args->index <= ichdr.count);
-	entsize = xfs_attr_leaf_newentsize(args, NULL);
+	entsize = xfs_attr_leaf_newentsize(args->geo, args->namelen,
+			args->valuelen, NULL);
 
 	/*
 	 * Search through freemap for first-fit on new name length.
@@ -1399,6 +1400,7 @@ xfs_attr3_leaf_add_work(
 	struct xfs_attr_leaf_name_local *name_loc;
 	struct xfs_attr_leaf_name_remote *name_rmt;
 	struct xfs_mount	*mp;
+	int			entsize;
 	int			tmp;
 	int			i;
 
@@ -1428,11 +1430,14 @@ xfs_attr3_leaf_add_work(
 	ASSERT(ichdr->freemap[mapindex].base < args->geo->blksize);
 	ASSERT((ichdr->freemap[mapindex].base & 0x3) == 0);
 	ASSERT(ichdr->freemap[mapindex].size >=
-		xfs_attr_leaf_newentsize(args, NULL));
+		xfs_attr_leaf_newentsize(args->geo, args->namelen,
+				args->valuelen, NULL));
 	ASSERT(ichdr->freemap[mapindex].size < args->geo->blksize);
 	ASSERT((ichdr->freemap[mapindex].size & 0x3) == 0);
 
-	ichdr->freemap[mapindex].size -= xfs_attr_leaf_newentsize(args, &tmp);
+	entsize = xfs_attr_leaf_newentsize(args->geo, args->namelen,
+			args->valuelen, &tmp);
+	ichdr->freemap[mapindex].size -= entsize;
 
 	entry->nameidx = cpu_to_be16(ichdr->freemap[mapindex].base +
 				     ichdr->freemap[mapindex].size);
@@ -1820,6 +1825,8 @@ xfs_attr3_leaf_figure_balance(
 	struct xfs_attr_leafblock	*leaf1 = blk1->bp->b_addr;
 	struct xfs_attr_leafblock	*leaf2 = blk2->bp->b_addr;
 	struct xfs_attr_leaf_entry	*entry;
+	struct xfs_da_args		*args;
+	int				entsize;
 	int				count;
 	int				max;
 	int				index;
@@ -1829,14 +1836,16 @@ xfs_attr3_leaf_figure_balance(
 	int				foundit = 0;
 	int				tmp;
 
+	args = state->args;
 	/*
 	 * Examine entries until we reduce the absolute difference in
 	 * byte usage between the two blocks to a minimum.
 	 */
 	max = ichdr1->count + ichdr2->count;
 	half = (max + 1) * sizeof(*entry);
-	half += ichdr1->usedbytes + ichdr2->usedbytes +
-			xfs_attr_leaf_newentsize(state->args, NULL);
+	entsize = xfs_attr_leaf_newentsize(args->geo, args->namelen,
+			args->valuelen, NULL);
+	half += ichdr1->usedbytes + ichdr2->usedbytes + entsize;
 	half /= 2;
 	lastdelta = state->args->geo->blksize;
 	entry = xfs_attr3_leaf_entryp(leaf1);
@@ -1847,8 +1856,9 @@ xfs_attr3_leaf_figure_balance(
 		 * The new entry is in the first block, account for it.
 		 */
 		if (count == blk1->index) {
-			tmp = totallen + sizeof(*entry) +
-				xfs_attr_leaf_newentsize(state->args, NULL);
+			entsize = xfs_attr_leaf_newentsize(args->geo,
+					args->namelen, args->valuelen, NULL);
+			tmp = totallen + sizeof(*entry) + entsize;
 			if (XFS_ATTR_ABS(half - tmp) > lastdelta)
 				break;
 			lastdelta = XFS_ATTR_ABS(half - tmp);
@@ -1883,8 +1893,9 @@ xfs_attr3_leaf_figure_balance(
 	 */
 	totallen -= count * sizeof(*entry);
 	if (foundit) {
-		totallen -= sizeof(*entry) +
-				xfs_attr_leaf_newentsize(state->args, NULL);
+		entsize = xfs_attr_leaf_newentsize(args->geo, args->namelen,
+				args->valuelen, NULL);
+		totallen -= sizeof(*entry) + entsize;
 	}
 
 	*countarg = count;
@@ -2660,20 +2671,22 @@ xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
  */
 int
 xfs_attr_leaf_newentsize(
-	struct xfs_da_args	*args,
+	struct xfs_da_geometry	*geo,
+	int			namelen,
+	int			valuelen,
 	int			*local)
 {
 	int			size;
 
-	size = xfs_attr_leaf_entsize_local(args->namelen, args->valuelen);
-	if (size < xfs_attr_leaf_entsize_local_max(args->geo->blksize)) {
+	size = xfs_attr_leaf_entsize_local(namelen, valuelen);
+	if (size < xfs_attr_leaf_entsize_local_max(geo->blksize)) {
 		if (local)
 			*local = 1;
 		return size;
 	}
 	if (local)
 		*local = 0;
-	return xfs_attr_leaf_entsize_remote(args->namelen);
+	return xfs_attr_leaf_entsize_remote(namelen);
 }
 
 
diff --git a/libxfs/xfs_attr_leaf.h b/libxfs/xfs_attr_leaf.h
index 6dd2d937..2f4382a1 100644
--- a/libxfs/xfs_attr_leaf.h
+++ b/libxfs/xfs_attr_leaf.h
@@ -96,7 +96,8 @@ void	xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
 xfs_dahash_t	xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
 int	xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
 				   struct xfs_buf *leaf2_bp);
-int	xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
+int	xfs_attr_leaf_newentsize(struct xfs_da_geometry *geo, int namelen,
+			int valuelen, int *local);
 int	xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
 			xfs_dablk_t bno, struct xfs_buf **bpp);
 void	xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
-- 
2.19.1