[PATCH 4/6] src/fssum: Add a flag for including file size in checksum

[Arvind Raghavan <raghavan.arvind@gmail.com>]

File size is currently included by default. It is useful to ignore file
sizes when testing the fsync of a directory, as the data in children is
not guaranteed to be persisted.

Signed-off-by: Arvind Raghavan <raghavan.arvind@gmail.com>
Signed-off-by: Jayashree Mohan <jaya@cs.utexas.edu>
Signed-off-by: Vijay Chidambaram <vijay@cs.utexas.edu>
---
 src/fssum.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/fssum.c b/src/fssum.c
index 018ad4a6..ece0f556 100644
--- a/src/fssum.c
+++ b/src/fssum.c
@@ -76,13 +76,14 @@ enum _flags {
 	FLAG_XATTRS,
 	FLAG_OPEN_ERROR,
 	FLAG_STRUCTURE,
+	FLAG_SIZE,
 	NUM_FLAGS
 };
 
-const char flchar[] = "ugoamcdtes";
+const char flchar[] = "ugoamcdtesz";
 char line[65536];
 
-int flags[NUM_FLAGS] = {1, 1, 1, 1, 1, 0, 1, 1, 0, 0};
+int flags[NUM_FLAGS] = {1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1};
 
 char *
 getln(char *buf, int size, FILE *fp)
@@ -137,7 +138,7 @@ usage(void)
 	fprintf(stderr, "    -w <file>    : send output to file\n");
 	fprintf(stderr, "    -v           : verbose mode (debugging only)\n");
 	fprintf(stderr, "    -r <file>    : read checksum or manifest from file\n");
-	fprintf(stderr, "    -[ugoamcdtes]: specify which fields to include in checksum calculation.\n");
+	fprintf(stderr, "    -[ugoamcdtesz]: specify which fields to include in checksum calculation.\n");
 	fprintf(stderr, "         u       : include uid\n");
 	fprintf(stderr, "         g       : include gid\n");
 	fprintf(stderr, "         o       : include mode\n");
@@ -148,13 +149,14 @@ usage(void)
 	fprintf(stderr, "         t       : include xattrs\n");
 	fprintf(stderr, "         e       : include open errors (aborts otherwise)\n");
 	fprintf(stderr, "         s       : include block structure (holes)\n");
-	fprintf(stderr, "    -[UGOAMCDTES]: exclude respective field from calculation\n");
+	fprintf(stderr, "         z       : include file size\n");
+	fprintf(stderr, "    -[UGOAMCDTESZ]: exclude respective field from calculation\n");
 	fprintf(stderr, "    -n           : reset all flags\n");
 	fprintf(stderr, "    -N           : set all flags\n");
 	fprintf(stderr, "    -x path      : exclude path when building checksum (multiple ok)\n");
 	fprintf(stderr, "    -R           : traverse dirs non-recursively (recursive is default)\n");
 	fprintf(stderr, "    -h           : this help\n\n");
-	fprintf(stderr, "The default field mask is ugoamCdtES. If the checksum/manifest is read from a\n");
+	fprintf(stderr, "The default field mask is ugoamCdtESz. If the checksum/manifest is read from a\n");
 	fprintf(stderr, "file, the mask is taken from there and the values given on the command line\n");
 	fprintf(stderr, "are ignored.\n");
 	exit(-1);
@@ -649,7 +651,8 @@ sum_one(int dirfd, int level, sum_t *dircs, char *path_prefix,
 			close(fd);
 		}
 	} else if (S_ISREG(st.st_mode)) {
-		sum_add_u64(&meta, st.st_size);
+		if (flags[FLAG_SIZE])
+			sum_add_u64(&meta, st.st_size);
 		if (flags[FLAG_DATA]) {
 			if (verbose)
 				fprintf(stderr, "file %s\n",
@@ -730,7 +733,7 @@ main(int argc, char *argv[])
 	int plen;
 	int elen;
 	int n_flags = 0;
-	const char *allopts = "heEfuUgGoOaAmMcCdDtTsSnNRw:r:vx:";
+	const char *allopts = "heEfuUgGoOaAmMcCdDtTsSzZnNRw:r:vx:";
 
 	out_fp = stdout;
 	while ((c = getopt(argc, argv, allopts)) != EOF) {
@@ -761,6 +764,8 @@ main(int argc, char *argv[])
 		case 'E':
 		case 's':
 		case 'S':
+		case 'z':
+		case 'Z':
 			++n_flags;
 			parse_flag(c);
 			break;
-- 
2.20.1