btrfs-progs: show-super: Add option to print superblock at given bytenr

[platform/upstream/btrfs-progs.git] / btrfs-show-super.c

diff --git a/btrfs-show-super.c b/btrfs-show-super.c
index 4afa852..d8ad69e 100644 (file)
--- a/btrfs-show-super.c
+++ b/btrfs-show-super.c
@@ -31,7 +31,6 @@
 #include "print-tree.h"
 #include "transaction.h"
 #include "list.h"
-#include "version.h"
 #include "utils.h"
 #include "crc32c.h"
 
@@ -49,7 +48,8 @@ static void print_usage(void)
        fprintf(stderr, "\t-a : print information of all superblocks\n");
        fprintf(stderr, "\t-i <super_mirror> : specify which mirror to print out\n");
        fprintf(stderr, "\t-F : attempt to dump superblocks with bad magic\n");
-       fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
+       fprintf(stderr, "\t-s <bytenr> : specify alternate superblock offset\n");
+       fprintf(stderr, "%s\n", PACKAGE_STRING);
 }
 
 int main(int argc, char **argv)
@@ -64,7 +64,7 @@ int main(int argc, char **argv)
        u64 arg;
        u64 sb_bytenr = btrfs_sb_offset(0);
 
-       while ((opt = getopt(argc, argv, "fFai:")) != -1) {
+       while ((opt = getopt(argc, argv, "fFai:s:")) != -1) {
                switch (opt) {
                case 'i':
                        arg = arg_strtou64(optarg);
@@ -87,6 +87,10 @@ int main(int argc, char **argv)
                case 'F':
                        force = 1;
                        break;
+               case 's':
+                       sb_bytenr = arg_strtou64(optarg);
+                       all = 0;
+                       break;
                default:
                        print_usage();
                        exit(1);
@@ -306,7 +310,30 @@ struct readable_flag_entry incompat_flags_array[] = {
 static const int incompat_flags_num = sizeof(incompat_flags_array) /
                                      sizeof(struct readable_flag_entry);
 
-static void print_readable_incompat_flag(u64 flag)
+#define DEF_HEADER_FLAG_ENTRY(bit_name)                        \
+       {BTRFS_HEADER_FLAG_##bit_name, #bit_name}
+#define DEF_SUPER_FLAG_ENTRY(bit_name)                 \
+       {BTRFS_SUPER_FLAG_##bit_name, #bit_name}
+
+struct readable_flag_entry super_flags_array[] = {
+       DEF_HEADER_FLAG_ENTRY(WRITTEN),
+       DEF_HEADER_FLAG_ENTRY(RELOC),
+       DEF_SUPER_FLAG_ENTRY(CHANGING_FSID),
+       DEF_SUPER_FLAG_ENTRY(SEEDING),
+       DEF_SUPER_FLAG_ENTRY(METADUMP),
+       DEF_SUPER_FLAG_ENTRY(METADUMP_V2)
+};
+static const int super_flags_num = ARRAY_SIZE(super_flags_array);
+
+#define BTRFS_SUPER_FLAG_SUPP  (BTRFS_HEADER_FLAG_WRITTEN |\
+                                BTRFS_HEADER_FLAG_RELOC |\
+                                BTRFS_SUPER_FLAG_CHANGING_FSID |\
+                                BTRFS_SUPER_FLAG_SEEDING |\
+                                BTRFS_SUPER_FLAG_METADUMP |\
+                                BTRFS_SUPER_FLAG_METADUMP_V2)
+
+static void __print_readable_flag(u64 flag, struct readable_flag_entry *array,
+                                 int array_size, u64 supported_flags)
 {
        int i;
        int first = 1;
@@ -314,9 +341,10 @@ static void print_readable_incompat_flag(u64 flag)
 
        if (!flag)
                return;
+
        printf("\t\t\t( ");
-       for (i = 0; i < incompat_flags_num; i++) {
-               entry = incompat_flags_array + i;
+       for (i = 0; i < array_size; i++) {
+               entry = array + i;
                if (flag & entry->bit) {
                        if (first)
                                printf("%s ", entry->output);
@@ -325,7 +353,7 @@ static void print_readable_incompat_flag(u64 flag)
                        first = 0;
                }
        }
-       flag &= ~BTRFS_FEATURE_INCOMPAT_SUPP;
+       flag &= ~supported_flags;
        if (flag) {
                if (first)
                        printf("unknown flag: 0x%llx ", flag);
@@ -335,6 +363,19 @@ static void print_readable_incompat_flag(u64 flag)
        printf(")\n");
 }
 
+static void print_readable_incompat_flag(u64 flag)
+{
+       return __print_readable_flag(flag, incompat_flags_array,
+                                    incompat_flags_num,
+                                    BTRFS_FEATURE_INCOMPAT_SUPP);
+}
+
+static void print_readable_super_flag(u64 flag)
+{
+       return __print_readable_flag(flag, super_flags_array,
+                                    super_flags_num, BTRFS_SUPER_FLAG_SUPP);
+}
+
 static void dump_superblock(struct btrfs_super_block *sb, int full)
 {
        int i;
@@ -354,6 +395,7 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
                (unsigned long long)btrfs_super_bytenr(sb));
        printf("flags\t\t\t0x%llx\n",
                (unsigned long long)btrfs_super_flags(sb));
+       print_readable_super_flag(btrfs_super_flags(sb));
 
        printf("magic\t\t\t");
        s = (char *) &sb->magic;