dedup

commit 125379d1fbda72262e86305b35e1236d421c2639
parent c2ec40d6f142c129320bd5526c3bcd5b2f512f7d
Author: sin <sin@2f30.org>
Date:   Thu, 25 Apr 2019 19:02:52 +0100

Make snapshots immutable

Diffstat:
M
snap.c
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/snap.c b/snap.c
@@ -140,6 +140,10 @@ sopen(char *path, int flags, int mode, struct sctx **sctx)
 	if (path == NULL || sctx == NULL)
 		return -1;
 
+	/* Existing snapshots are immutable */
+	if (flags != O_RDONLY)
+		return -1;
+
 	fd = open(path, flags, mode);
 	if (fd < 0)
 		return -1;
@@ -153,7 +157,7 @@ sopen(char *path, int flags, int mode, struct sctx **sctx)
 	SLIST_INIT(&(*sctx)->mdhead);
 	(*sctx)->mdnext = NULL;
 	(*sctx)->fd = fd;
-	(*sctx)->rdonly = flags == O_RDONLY;
+	(*sctx)->rdonly = 1;
 
 	if (initmdhead(*sctx) < 0) {
 		free(*sctx);