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Add options to btrfs-find-root to control generation and level

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Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Chris Mason 2013-07-05 12:11:22 -04:00
parent e035bcdddb
commit f4ca892339
1 changed files with 34 additions and 9 deletions
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43
btrfs-find-root.c
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@ -37,10 +37,13 @@
static u16 csum_size = 0; static u16 csum_size = 0;
static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID; static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID;
static u64 search_generation = 0;
static unsigned long search_level = 0;
static void usage() static void usage()
{ {
fprintf(stderr, "Usage: find-roots [-o search_objectid] <device>\n"); fprintf(stderr, "Usage: find-roots [-o search_objectid] "
"[ -g search_generation ] [ -l search_level ] <device>\n");
} }
int csum_block(void *buf, u32 len) int csum_block(void *buf, u32 len)
@ -126,10 +129,10 @@ out:
static int search_iobuf(struct btrfs_root *root, void *iobuf, static int search_iobuf(struct btrfs_root *root, void *iobuf,
size_t iobuf_size, off_t offset) size_t iobuf_size, off_t offset)
{ {
u64 gen = btrfs_super_generation(root->fs_info->super_copy); u64 gen = search_generation;
u64 objectid = search_objectid; u64 objectid = search_objectid;
u32 size = btrfs_super_nodesize(root->fs_info->super_copy); u32 size = btrfs_super_nodesize(root->fs_info->super_copy);
u8 level = root->fs_info->super_copy->root_level; u8 level = search_level;
size_t block_off = 0; size_t block_off = 0;
while (block_off < iobuf_size) { while (block_off < iobuf_size) {
@ -147,8 +150,9 @@ static int search_iobuf(struct btrfs_root *root, void *iobuf,
goto next; goto next;
if (h_byte != (offset + block_off)) if (h_byte != (offset + block_off))
goto next; goto next;
if (h_level != level) if (h_level < level)
goto next; goto next;
level = h_level;
if (csum_block(block, size)) { if (csum_block(block, size)) {
fprintf(stderr, "Well block %Lu seems good, " fprintf(stderr, "Well block %Lu seems good, "
"but the csum doesn't match\n", "but the csum doesn't match\n",
@ -158,11 +162,12 @@ static int search_iobuf(struct btrfs_root *root, void *iobuf,
if (h_gen != gen) { if (h_gen != gen) {
fprintf(stderr, "Well block %Lu seems great, " fprintf(stderr, "Well block %Lu seems great, "
"but generation doesn't match, " "but generation doesn't match, "
"have=%Lu, want=%Lu\n", h_byte, h_gen, "have=%Lu, want=%Lu level %Lu\n", h_byte,
gen); h_gen, gen, h_level);
goto next; goto next;
} }
printf("Found tree root at %Lu\n", h_byte); printf("Found tree root at %Lu gen %Lu level %Lu\n", h_byte,
h_gen, h_level);
return 0; return 0;
next: next:
block_off += size; block_off += size;
@ -281,10 +286,10 @@ int main(int argc, char **argv)
int opt; int opt;
int ret; int ret;
while ((opt = getopt(argc, argv, "o:")) != -1) { while ((opt = getopt(argc, argv, "l:o:g:")) != -1) {
switch(opt) { switch(opt) {
case 'o':
errno = 0; errno = 0;
case 'o':
search_objectid = (u64)strtoll(optarg, NULL, search_objectid = (u64)strtoll(optarg, NULL,
10); 10);
if (errno) { if (errno) {
@ -293,6 +298,23 @@ int main(int argc, char **argv)
exit(1); exit(1);
} }
break; break;
case 'g':
search_generation = (u64)strtoll(optarg, NULL,
10);
if (errno) {
fprintf(stderr, "Error parsing "
"generation\n");
exit(1);
}
break;
case 'l':
search_level = strtol(optarg, NULL, 10);
if (errno) {
fprintf(stderr, "Error parsing "
"level\n");
exit(1);
}
break;
default: default:
usage(); usage();
exit(1); exit(1);
@ -318,6 +340,9 @@ int main(int argc, char **argv)
exit(1); exit(1);
} }
if (search_generation == 0)
search_generation = btrfs_super_generation(root->fs_info->super_copy);
csum_size = btrfs_super_csum_size(root->fs_info->super_copy); csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
ret = find_root(root); ret = find_root(root);
close_ctree(root); close_ctree(root);