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#include <fcntl.h>
#include <getopt.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "cmds.h"
#include "libbcachefs.h"
#include "qcow2.h"
#include "libbcachefs/bcachefs.h"
#include "libbcachefs/btree_cache.h"
#include "libbcachefs/btree_iter.h"
#include "libbcachefs/error.h"
#include "libbcachefs/extents.h"
#include "libbcachefs/sb-members.h"
#include "libbcachefs/super.h"
static void dump_usage(void)
{
puts("bcachefs dump - dump filesystem metadata\n"
"Usage: bcachefs dump [OPTION]... <devices>\n"
"\n"
"Options:\n"
" -o output Output qcow2 image(s)\n"
" -f, --force Force; overwrite when needed\n"
" --nojournal Don't dump entire journal, just dirty entries\n"
" -h, --help Display this help and exit\n"
"Report bugs to <linux-bcachefs@vger.kernel.org>");
}
static void dump_one_device(struct bch_fs *c, struct bch_dev *ca, int fd,
bool entire_journal)
{
struct bch_sb *sb = ca->disk_sb.sb;
ranges data = { 0 };
unsigned i;
int ret;
/* Superblock: */
range_add(&data, BCH_SB_LAYOUT_SECTOR << 9,
sizeof(struct bch_sb_layout));
for (i = 0; i < sb->layout.nr_superblocks; i++)
range_add(&data,
le64_to_cpu(sb->layout.sb_offset[i]) << 9,
vstruct_bytes(sb));
/* Journal: */
for (i = 0; i < ca->journal.nr; i++)
if (entire_journal ||
ca->journal.bucket_seq[i] >= c->journal.last_seq_ondisk) {
u64 bucket = ca->journal.buckets[i];
range_add(&data,
bucket_bytes(ca) * bucket,
bucket_bytes(ca));
}
/* Btree: */
for (i = 0; i < BTREE_ID_NR; i++) {
const struct bch_extent_ptr *ptr;
struct bkey_ptrs_c ptrs;
struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct btree *b;
__for_each_btree_node(trans, iter, i, POS_MIN, 0, 1, 0, b, ret) {
struct btree_node_iter iter;
struct bkey u;
struct bkey_s_c k;
for_each_btree_node_key_unpack(b, k, &iter, &u) {
ptrs = bch2_bkey_ptrs_c(k);
bkey_for_each_ptr(ptrs, ptr)
if (ptr->dev == ca->dev_idx)
range_add(&data,
ptr->offset << 9,
btree_bytes(c));
}
}
if (ret)
die("error %s walking btree nodes", bch2_err_str(ret));
b = bch2_btree_id_root(c, i)->b;
if (!btree_node_fake(b)) {
ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
bkey_for_each_ptr(ptrs, ptr)
if (ptr->dev == ca->dev_idx)
range_add(&data,
ptr->offset << 9,
btree_bytes(c));
}
bch2_trans_iter_exit(trans, &iter);
bch2_trans_put(trans);
}
qcow2_write_image(ca->disk_sb.bdev->bd_buffered_fd, fd, &data,
max_t(unsigned, btree_bytes(c) / 8, block_bytes(c)));
darray_exit(&data);
}
int cmd_dump(int argc, char *argv[])
{
static const struct option longopts[] = {
{ "force", no_argument, NULL, 'f' },
{ "nojournal", no_argument, NULL, 'j' },
{ "verbose", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ NULL }
};
struct bch_opts opts = bch2_opts_empty();
struct bch_dev *ca;
char *out = NULL;
unsigned i, nr_devices = 0;
bool force = false, entire_journal = true;
int fd, opt;
opt_set(opts, read_only, true);
opt_set(opts, nochanges, true);
opt_set(opts, norecovery, true);
opt_set(opts, degraded, true);
opt_set(opts, errors, BCH_ON_ERROR_continue);
opt_set(opts, fix_errors, FSCK_FIX_no);
while ((opt = getopt_long(argc, argv, "o:fvh",
longopts, NULL)) != -1)
switch (opt) {
case 'o':
out = optarg;
break;
case 'f':
force = true;
break;
case 'j':
entire_journal = false;
break;
case 'v':
opt_set(opts, verbose, true);
break;
case 'h':
dump_usage();
exit(EXIT_SUCCESS);
}
args_shift(optind);
if (!out)
die("Please supply output filename");
if (!argc)
die("Please supply device(s) to check");
struct bch_fs *c = bch2_fs_open(argv, argc, opts);
if (IS_ERR(c))
die("error opening %s: %s", argv[0], bch2_err_str(PTR_ERR(c)));
down_read(&c->gc_lock);
for_each_online_member(ca, c, i)
nr_devices++;
BUG_ON(!nr_devices);
for_each_online_member(ca, c, i) {
int flags = O_WRONLY|O_CREAT|O_TRUNC;
if (!force)
flags |= O_EXCL;
if (!c->devs[i])
continue;
char *path = nr_devices > 1
? mprintf("%s.%u.qcow2", out, i)
: mprintf("%s.qcow2", out);
fd = xopen(path, flags, 0600);
free(path);
dump_one_device(c, ca, fd, entire_journal);
close(fd);
}
up_read(&c->gc_lock);
bch2_fs_stop(c);
return 0;
}
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