[Cluster-devel] [GFS2 PATCH] gfs2: eliminate ssize parameter from gfs2_struct2blk

[Bob Peterson <rpeterso@redhat.com>]

Hi,

Every caller of function gfs2_struct2blk specified sizeof(u64).
This patch eliminates the unnecessary parameter and replaces the
size calculation with a new inline function gfs2_ptrs_per_ld to
compute the maximum number of block pointers we can fit inside a
log descriptor. This new function will be used later to fix some
revoke calculations.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
 fs/gfs2/glops.c |  2 +-
 fs/gfs2/log.c   | 11 ++++-------
 fs/gfs2/log.h   | 14 ++++++++++++--
 fs/gfs2/lops.c  |  2 +-
 fs/gfs2/trans.c |  3 +--
 5 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 4ede1f18de85..061d22e1ceb6 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -95,7 +95,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
 	/* A shortened, inline version of gfs2_trans_begin()
          * tr->alloced is not set since the transaction structure is
          * on the stack */
-	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
+	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes);
 	tr.tr_ip = _RET_IP_;
 	if (gfs2_log_reserve(sdp, tr.tr_reserved) < 0)
 		return;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index eb3f2e7b8085..fe1c35004b10 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -37,7 +37,6 @@ static void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  * gfs2_struct2blk - compute stuff
  * @sdp: the filesystem
  * @nstruct: the number of structures
- * @ssize: the size of the structures
  *
  * Compute the number of log descriptor blocks needed to hold a certain number
  * of structures of a certain size.
@@ -45,18 +44,17 @@ static void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  * Returns: the number of blocks needed (minimum is always 1)
  */
 
-unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
-			     unsigned int ssize)
+unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct)
 {
 	unsigned int blks;
 	unsigned int first, second;
 
 	blks = 1;
-	first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
+	first = gfs2_ptrs_per_ld(sdp);
 
 	if (nstruct > first) {
 		second = (sdp->sd_sb.sb_bsize -
-			  sizeof(struct gfs2_meta_header)) / ssize;
+			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
 		blks += DIV_ROUND_UP(nstruct - first, second);
 	}
 
@@ -473,8 +471,7 @@ static unsigned int calc_reserved(struct gfs2_sbd *sdp)
 	}
 
 	if (sdp->sd_log_commited_revoke > 0)
-		reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
-					  sizeof(u64));
+		reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke);
 	/* One for the overall header */
 	if (reserved)
 		reserved++;
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index 2ff163a8dce1..910fb97f34a1 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -60,9 +60,19 @@ static inline void gfs2_ordered_add_inode(struct gfs2_inode *ip)
 		spin_unlock(&sdp->sd_ordered_lock);
 	}
 }
+
+/**
+ * gfs2_ptrs_per_ld - compute max number of pointers we can fit in a log desc
+ * @sdp: the filesystem
+ */
+static inline unsigned int gfs2_ptrs_per_ld(struct gfs2_sbd *sdp)
+{
+	return (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) /
+		sizeof(u64);
+}
+
 extern void gfs2_ordered_del_inode(struct gfs2_inode *ip);
-extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
-			    unsigned int ssize);
+extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct);
 
 extern void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
 extern int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 12696133618c..3200a6b82487 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -866,7 +866,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 	if (!sdp->sd_log_num_revoke)
 		return;
 
-	length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
+	length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke);
 	page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
 	offset = sizeof(struct gfs2_log_descriptor);
 
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 9d4227330de4..4d01fe19c125 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -49,8 +49,7 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
 	if (blocks)
 		tr->tr_reserved += 6 + blocks;
 	if (revokes)
-		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
-						   sizeof(u64));
+		tr->tr_reserved += gfs2_struct2blk(sdp, revokes);
 	INIT_LIST_HEAD(&tr->tr_databuf);
 	INIT_LIST_HEAD(&tr->tr_buf);