dedup

commit d96224299eea385265b405cc59a3b4881e75d69c
parent fb016d2858d1d77359c56f4d67070fc8386879b6
Author: sin <sin@2f30.org>
Date:   Sun,  5 May 2019 21:17:32 +0100

Add some comments to snap.c

Diffstat:
M
snap.c
 | 
16
++++++++--------

1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/snap.c b/snap.c
@@ -20,15 +20,15 @@
 #define NERRBUF	128
 
 struct mdnode {
-	unsigned char md[MDSIZE];
-	SLIST_ENTRY(mdnode) e;
+	unsigned char md[MDSIZE];	/* hash of block */
+	SLIST_ENTRY(mdnode) e;		/* mdhead link node */
 };
 
 struct sctx {
-	SLIST_HEAD(mdhead, mdnode) mdhead;
-	struct mdnode *mdnext;
-	int fd;
-	int rdonly;
+	SLIST_HEAD(mdhead, mdnode) mdhead;	/* list of hashes contained in snapshot */
+	struct mdnode *mdnext;	/* next hash to be returned via sget() */
+	int fd;		/* underlying snapshot file descriptor */
+	int rdonly;	/* when set to 1, the ssync() operation is a no-op */
 };
 
 static char errbuf[NERRBUF];
@@ -45,7 +45,7 @@ loadmd(struct sctx *sctx)
 	}
 	if (xread(sctx->fd, mdnode->md, MDSIZE) != MDSIZE) {
 		free(mdnode);
-		sseterr("failed to read message digest: %s", strerror(errno));
+		sseterr("failed to read block hash: %s", strerror(errno));
 		return -1;
 	}
 	SLIST_INSERT_HEAD(&sctx->mdhead, mdnode, e);
@@ -224,7 +224,7 @@ ssync(struct sctx *sctx)
 	}
 	SLIST_FOREACH(mdnode, &sctx->mdhead, e) {
 		if (xwrite(sctx->fd, mdnode->md, MDSIZE) != MDSIZE) {
-			sseterr("failed to write message digest: %s",
+			sseterr("failed to write block hash: %s",
 			        strerror(errno));
 			return -1;
 		}