Add an option to mkfs to specify which checksum algorithm will be used for
the filesystem.
XXX this patch should go last in the series.
Signed-off-by: Johannes Thumshirn <jthumsh...@suse.de>
---
mkfs/common.c | 2 +-
mkfs/common.h | 2 ++
mkfs/main.c | 21 ++++++++++++++++++++-
3 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/mkfs/common.c b/mkfs/common.c
index caca5e707233..8249492704ad 100644
--- a/mkfs/common.c
+++ b/mkfs/common.c
@@ -201,7 +201,7 @@ int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
super.__unused_leafsize = cpu_to_le32(cfg->nodesize);
btrfs_set_super_nodesize(&super, cfg->nodesize);
btrfs_set_super_stripesize(&super, cfg->stripesize);
- btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
+ btrfs_set_super_csum_type(&super, cfg->csum_type);
btrfs_set_super_chunk_root_generation(&super, 1);
btrfs_set_super_cache_generation(&super, -1);
btrfs_set_super_incompat_flags(&super, cfg->features);
diff --git a/mkfs/common.h b/mkfs/common.h
index 28912906d0a9..384c1ef6a753 100644
--- a/mkfs/common.h
+++ b/mkfs/common.h
@@ -53,6 +53,8 @@ struct btrfs_mkfs_config {
u64 features;
/* Size of the filesystem in bytes */
u64 num_bytes;
+ /* checksum algorithm to use */
+ u16 csum_type;
/* Output fields, set during creation */
diff --git a/mkfs/main.c b/mkfs/main.c
index 8dbec0717b89..3deff76045ba 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -346,6 +346,7 @@ static void print_usage(int ret)
printf("\t--shrink (with --rootdir) shrink the filled
filesystem to minimal size\n");
printf("\t-K|--nodiscard do not perform whole device TRIM\n");
printf("\t-f|--force force overwrite of existing
filesystem\n");
+ printf("\t-C|--checksum checksum algorithm to use (default:
crc32c)\n");
printf(" general:\n");
printf("\t-q|--quiet no messages except errors\n");
printf("\t-V|--version print the mkfs.btrfs version and
exit\n");
@@ -380,6 +381,18 @@ static u64 parse_profile(const char *s)
return 0;
}
+static u16 parse_csum_type(const char *s)
+{
+ if (strcasecmp(s, "crc32c") == 0) {
+ return BTRFS_CSUM_TYPE_CRC32;
+ } else {
+ error("unknown csum type %s", s);
+ exit(1);
+ }
+ /* not reached */
+ return 0;
+}
+
static char *parse_label(const char *input)
{
int len = strlen(input);
@@ -826,6 +839,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
struct mkfs_allocation allocation = { 0 };
struct btrfs_mkfs_config mkfs_cfg;
+ int csum_type = BTRFS_CSUM_TYPE_CRC32;
crc32c_optimization_init();
@@ -835,6 +849,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
static const struct option long_options[] = {
{ "alloc-start", required_argument, NULL, 'A'},
{ "byte-count", required_argument, NULL, 'b' },
+ { "checksum", required_argument, NULL, 'C' },
{ "force", no_argument, NULL, 'f' },
{ "leafsize", required_argument, NULL, 'l' },
{ "label", required_argument, NULL, 'L'},
@@ -854,7 +869,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
{ NULL, 0, NULL, 0}
};
- c = getopt_long(argc, argv, "A:b:fl:n:s:m:d:L:O:r:U:VMKq",
+ c = getopt_long(argc, argv, "A:b:C:fl:n:s:m:d:L:O:r:U:VMKq",
long_options, NULL);
if (c < 0)
break;
@@ -932,6 +947,9 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
case GETOPT_VAL_SHRINK:
shrink_rootdir = true;
break;
+ case 'C':
+ csum_type = parse_csum_type(optarg);
+ break;
case GETOPT_VAL_HELP:
default:
print_usage(c != GETOPT_VAL_HELP);
@@ -1170,6 +1188,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
mkfs_cfg.sectorsize = sectorsize;
mkfs_cfg.stripesize = stripesize;
mkfs_cfg.features = features;
+ mkfs_cfg.csum_type = csum_type;
ret = make_btrfs(fd, &mkfs_cfg);
if (ret) {
--
2.16.4
