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btrfs-progs: sb-mod: don't fixup checksum for read-only ops 

On images with some damage and mismatching checksum the read operations
will fixup the checksum. This may not be desired and does not make much
sense for read anyway.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-10-04 15:17:42 +02:00
parent dd8e7477f7
commit f7e4860e9f
1 changed files with 9 additions and 4 deletions
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13
btrfs-sb-mod.c
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@ -84,7 +84,6 @@ static u64 arg_strtou64(const char *str)
return value; return value;
} }
enum field_op { enum field_op {
OP_GET, OP_GET,
OP_SET, OP_SET,
@ -211,6 +210,11 @@ struct sb_field {
#define MOD_DEV_FIELD8(fname, set, val) \ #define MOD_DEV_FIELD8(fname, set, val) \
MOD_DEV_FIELD_XX(fname, set, val, 8, "%hhu", "%hhx", unsigned char) MOD_DEV_FIELD_XX(fname, set, val, 8, "%hhu", "%hhx", unsigned char)
static bool op_is_write(enum field_op op)
{
return op != OP_GET;
}
static void mod_field_by_name(struct btrfs_super_block *sb, int set, const char *name, static void mod_field_by_name(struct btrfs_super_block *sb, int set, const char *name,
u64 *val) u64 *val)
{ {
@ -362,13 +366,12 @@ int main(int argc, char **argv)
hdr = (struct btrfs_header *)buf; hdr = (struct btrfs_header *)buf;
/* verify checksum */ /* verify checksum */
if (!check_csum_superblock(&hdr->csum)) { if (!check_csum_superblock(&hdr->csum)) {
printf("super block checksum does not match at offset %llu, will be corrected\n", printf("super block checksum does not match at offset %llu, will be corrected after write\n",
(unsigned long long)off); (unsigned long long)off);
} else { } else {
printf("super block checksum is ok\n"); printf("super block checksum is ok\n");
} }
sb = (struct btrfs_super_block *)buf; sb = (struct btrfs_super_block *)buf;
changed = 0;
specidx = 0; specidx = 0;
for (i = 2; i < argc; i++) { for (i = 2; i < argc; i++) {
@ -395,9 +398,11 @@ int main(int argc, char **argv)
} }
} }
changed = 0;
for (i = 0; i < specidx; i++) { for (i = 0; i < specidx; i++) {
sb_edit(sb, &spec[i]); sb_edit(sb, &spec[i]);
changed = 1; if (op_is_write(spec[i].fop))
changed = 1;
} }
if (changed) { if (changed) {