* Boston, MA 021110-1307, USA.
*/
-#define _XOPEN_SOURCE 500
-#define _GNU_SOURCE 1
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <zlib.h>
+#include <getopt.h>
+
#include "kerncompat.h"
#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "utils.h"
-#include "version.h"
-
+#include "volumes.h"
+#include "extent_io.h"
#define HEADER_MAGIC 0xbd5c25e27295668bULL
#define MAX_PENDING_SIZE (256 * 1024)
#define COMPRESS_NONE 0
#define COMPRESS_ZLIB 1
+#define MAX_WORKER_THREADS (32)
+
struct meta_cluster_item {
__le64 bytenr;
__le32 size;
#define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
sizeof(struct meta_cluster_item))
+struct fs_chunk {
+ u64 logical;
+ u64 physical;
+ /*
+ * physical_dup only store additonal physical for BTRFS_BLOCK_GROUP_DUP
+ * currently restore only support single and DUP
+ * TODO: modify this structure and the function related to this
+ * structure for support RAID*
+ */
+ u64 physical_dup;
+ u64 bytes;
+ struct rb_node l;
+ struct rb_node p;
+ struct list_head list;
+};
+
struct async_work {
struct list_head list;
struct list_head ordered;
struct btrfs_root *root;
FILE *out;
- struct meta_cluster *cluster;
+ union {
+ struct meta_cluster cluster;
+ char meta_cluster_bytes[BLOCK_SIZE];
+ };
- pthread_t *threads;
+ pthread_t threads[MAX_WORKER_THREADS];
size_t num_threads;
pthread_mutex_t mutex;
pthread_cond_t cond;
+ struct rb_root name_tree;
struct list_head list;
struct list_head ordered;
int compress_level;
int done;
+ int data;
+ int sanitize_names;
+
+ int error;
+};
+
+struct name {
+ struct rb_node n;
+ char *val;
+ char *sub;
+ u32 len;
};
struct mdrestore_struct {
FILE *in;
FILE *out;
- pthread_t *threads;
+ pthread_t threads[MAX_WORKER_THREADS];
size_t num_threads;
pthread_mutex_t mutex;
pthread_cond_t cond;
+ struct rb_root chunk_tree;
+ struct rb_root physical_tree;
struct list_head list;
+ struct list_head overlapping_chunks;
size_t num_items;
+ u32 nodesize;
+ u64 devid;
+ u64 alloced_chunks;
+ u64 last_physical_offset;
+ u8 uuid[BTRFS_UUID_SIZE];
+ u8 fsid[BTRFS_FSID_SIZE];
int compress_method;
int done;
int error;
+ int old_restore;
+ int fixup_offset;
+ int multi_devices;
+ int clear_space_cache;
+ struct btrfs_fs_info *info;
};
+static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
+ u64 search, u64 cluster_bytenr);
+static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size);
+
static void csum_block(u8 *buf, size_t len)
{
- char result[BTRFS_CRC32_SIZE];
+ u8 result[BTRFS_CRC32_SIZE];
u32 crc = ~(u32)0;
crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, result);
memcpy(buf, result, BTRFS_CRC32_SIZE);
}
+static int has_name(struct btrfs_key *key)
+{
+ switch (key->type) {
+ case BTRFS_DIR_ITEM_KEY:
+ case BTRFS_DIR_INDEX_KEY:
+ case BTRFS_INODE_REF_KEY:
+ case BTRFS_INODE_EXTREF_KEY:
+ case BTRFS_XATTR_ITEM_KEY:
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static char *generate_garbage(u32 name_len)
+{
+ char *buf = malloc(name_len);
+ int i;
+
+ if (!buf)
+ return NULL;
+
+ for (i = 0; i < name_len; i++) {
+ char c = rand_range(94) + 33;
+
+ if (c == '/')
+ c++;
+ buf[i] = c;
+ }
+
+ return buf;
+}
+
+static int name_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
+{
+ struct name *entry = rb_entry(a, struct name, n);
+ struct name *ins = rb_entry(b, struct name, n);
+ u32 len;
+
+ len = min(ins->len, entry->len);
+ return memcmp(ins->val, entry->val, len);
+}
+
+static int chunk_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
+{
+ struct fs_chunk *entry = rb_entry(a, struct fs_chunk, l);
+ struct fs_chunk *ins = rb_entry(b, struct fs_chunk, l);
+
+ if (fuzz && ins->logical >= entry->logical &&
+ ins->logical < entry->logical + entry->bytes)
+ return 0;
+
+ if (ins->logical < entry->logical)
+ return -1;
+ else if (ins->logical > entry->logical)
+ return 1;
+ return 0;
+}
+
+static int physical_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
+{
+ struct fs_chunk *entry = rb_entry(a, struct fs_chunk, p);
+ struct fs_chunk *ins = rb_entry(b, struct fs_chunk, p);
+
+ if (fuzz && ins->physical >= entry->physical &&
+ ins->physical < entry->physical + entry->bytes)
+ return 0;
+
+ if (fuzz && entry->physical >= ins->physical &&
+ entry->physical < ins->physical + ins->bytes)
+ return 0;
+
+ if (ins->physical < entry->physical)
+ return -1;
+ else if (ins->physical > entry->physical)
+ return 1;
+ return 0;
+}
+
+static void tree_insert(struct rb_root *root, struct rb_node *ins,
+ int (*cmp)(struct rb_node *a, struct rb_node *b,
+ int fuzz))
+{
+ struct rb_node ** p = &root->rb_node;
+ struct rb_node * parent = NULL;
+ int dir;
+
+ while(*p) {
+ parent = *p;
+
+ dir = cmp(*p, ins, 1);
+ if (dir < 0)
+ p = &(*p)->rb_left;
+ else if (dir > 0)
+ p = &(*p)->rb_right;
+ else
+ BUG();
+ }
+
+ rb_link_node(ins, parent, p);
+ rb_insert_color(ins, root);
+}
+
+static struct rb_node *tree_search(struct rb_root *root,
+ struct rb_node *search,
+ int (*cmp)(struct rb_node *a,
+ struct rb_node *b, int fuzz),
+ int fuzz)
+{
+ struct rb_node *n = root->rb_node;
+ int dir;
+
+ while (n) {
+ dir = cmp(n, search, fuzz);
+ if (dir < 0)
+ n = n->rb_left;
+ else if (dir > 0)
+ n = n->rb_right;
+ else
+ return n;
+ }
+
+ return NULL;
+}
+
+static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical,
+ u64 *size, u64 *physical_dup)
+{
+ struct fs_chunk *fs_chunk;
+ struct rb_node *entry;
+ struct fs_chunk search;
+ u64 offset;
+
+ if (logical == BTRFS_SUPER_INFO_OFFSET)
+ return logical;
+
+ search.logical = logical;
+ entry = tree_search(&mdres->chunk_tree, &search.l, chunk_cmp, 1);
+ if (!entry) {
+ if (mdres->in != stdin)
+ warning("cannot find a chunk, using logical");
+ return logical;
+ }
+ fs_chunk = rb_entry(entry, struct fs_chunk, l);
+ if (fs_chunk->logical > logical || fs_chunk->logical + fs_chunk->bytes < logical)
+ BUG();
+ offset = search.logical - fs_chunk->logical;
+
+ if (physical_dup) {
+ /* Only in dup case, physical_dup is not equal to 0 */
+ if (fs_chunk->physical_dup)
+ *physical_dup = fs_chunk->physical_dup + offset;
+ else
+ *physical_dup = 0;
+ }
+
+ *size = min(*size, fs_chunk->bytes + fs_chunk->logical - logical);
+ return fs_chunk->physical + offset;
+}
+
+
+static char *find_collision(struct metadump_struct *md, char *name,
+ u32 name_len)
+{
+ struct name *val;
+ struct rb_node *entry;
+ struct name tmp;
+ unsigned long checksum;
+ int found = 0;
+ int i;
+
+ tmp.val = name;
+ tmp.len = name_len;
+ entry = tree_search(&md->name_tree, &tmp.n, name_cmp, 0);
+ if (entry) {
+ val = rb_entry(entry, struct name, n);
+ free(name);
+ return val->sub;
+ }
+
+ val = malloc(sizeof(struct name));
+ if (!val) {
+ error("cannot sanitize name, not enough memory");
+ free(name);
+ return NULL;
+ }
+
+ memset(val, 0, sizeof(*val));
+
+ val->val = name;
+ val->len = name_len;
+ val->sub = malloc(name_len);
+ if (!val->sub) {
+ error("cannot sanitize name, not enough memory");
+ free(val);
+ free(name);
+ return NULL;
+ }
+
+ checksum = crc32c(~1, val->val, name_len);
+ memset(val->sub, ' ', name_len);
+ i = 0;
+ while (1) {
+ if (crc32c(~1, val->sub, name_len) == checksum &&
+ memcmp(val->sub, val->val, val->len)) {
+ found = 1;
+ break;
+ }
+
+ if (val->sub[i] == 127) {
+ do {
+ i++;
+ if (i >= name_len)
+ break;
+ } while (val->sub[i] == 127);
+
+ if (i >= name_len)
+ break;
+ val->sub[i]++;
+ if (val->sub[i] == '/')
+ val->sub[i]++;
+ memset(val->sub, ' ', i);
+ i = 0;
+ continue;
+ } else {
+ val->sub[i]++;
+ if (val->sub[i] == '/')
+ val->sub[i]++;
+ }
+ }
+
+ if (!found) {
+ warning(
+"cannot find a hash collision for '%.*s', generating garbage, it won't match indexes",
+ val->len, val->val);
+ for (i = 0; i < name_len; i++) {
+ char c = rand_range(94) + 33;
+
+ if (c == '/')
+ c++;
+ val->sub[i] = c;
+ }
+ }
+
+ tree_insert(&md->name_tree, &val->n, name_cmp);
+ return val->sub;
+}
+
+static void sanitize_dir_item(struct metadump_struct *md, struct extent_buffer *eb,
+ int slot)
+{
+ struct btrfs_dir_item *dir_item;
+ char *buf;
+ char *garbage;
+ unsigned long name_ptr;
+ u32 total_len;
+ u32 cur = 0;
+ u32 this_len;
+ u32 name_len;
+ int free_garbage = (md->sanitize_names == 1);
+
+ dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
+ total_len = btrfs_item_size_nr(eb, slot);
+ while (cur < total_len) {
+ this_len = sizeof(*dir_item) +
+ btrfs_dir_name_len(eb, dir_item) +
+ btrfs_dir_data_len(eb, dir_item);
+ name_ptr = (unsigned long)(dir_item + 1);
+ name_len = btrfs_dir_name_len(eb, dir_item);
+
+ if (md->sanitize_names > 1) {
+ buf = malloc(name_len);
+ if (!buf) {
+ error("cannot sanitize name, not enough memory");
+ return;
+ }
+ read_extent_buffer(eb, buf, name_ptr, name_len);
+ garbage = find_collision(md, buf, name_len);
+ } else {
+ garbage = generate_garbage(name_len);
+ }
+ if (!garbage) {
+ error("cannot sanitize name, not enough memory");
+ return;
+ }
+ write_extent_buffer(eb, garbage, name_ptr, name_len);
+ cur += this_len;
+ dir_item = (struct btrfs_dir_item *)((char *)dir_item +
+ this_len);
+ if (free_garbage)
+ free(garbage);
+ }
+}
+
+static void sanitize_inode_ref(struct metadump_struct *md,
+ struct extent_buffer *eb, int slot, int ext)
+{
+ struct btrfs_inode_extref *extref;
+ struct btrfs_inode_ref *ref;
+ char *garbage, *buf;
+ unsigned long ptr;
+ unsigned long name_ptr;
+ u32 item_size;
+ u32 cur_offset = 0;
+ int len;
+ int free_garbage = (md->sanitize_names == 1);
+
+ item_size = btrfs_item_size_nr(eb, slot);
+ ptr = btrfs_item_ptr_offset(eb, slot);
+ while (cur_offset < item_size) {
+ if (ext) {
+ extref = (struct btrfs_inode_extref *)(ptr +
+ cur_offset);
+ name_ptr = (unsigned long)(&extref->name);
+ len = btrfs_inode_extref_name_len(eb, extref);
+ cur_offset += sizeof(*extref);
+ } else {
+ ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
+ len = btrfs_inode_ref_name_len(eb, ref);
+ name_ptr = (unsigned long)(ref + 1);
+ cur_offset += sizeof(*ref);
+ }
+ cur_offset += len;
+
+ if (md->sanitize_names > 1) {
+ buf = malloc(len);
+ if (!buf) {
+ error("cannot sanitize name, not enough memory");
+ return;
+ }
+ read_extent_buffer(eb, buf, name_ptr, len);
+ garbage = find_collision(md, buf, len);
+ } else {
+ garbage = generate_garbage(len);
+ }
+
+ if (!garbage) {
+ error("cannot sanitize name, not enough memory");
+ return;
+ }
+ write_extent_buffer(eb, garbage, name_ptr, len);
+ if (free_garbage)
+ free(garbage);
+ }
+}
+
+static void sanitize_xattr(struct metadump_struct *md,
+ struct extent_buffer *eb, int slot)
+{
+ struct btrfs_dir_item *dir_item;
+ unsigned long data_ptr;
+ u32 data_len;
+
+ dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
+ data_len = btrfs_dir_data_len(eb, dir_item);
+
+ data_ptr = (unsigned long)((char *)(dir_item + 1) +
+ btrfs_dir_name_len(eb, dir_item));
+ memset_extent_buffer(eb, 0, data_ptr, data_len);
+}
+
+static void sanitize_name(struct metadump_struct *md, u8 *dst,
+ struct extent_buffer *src, struct btrfs_key *key,
+ int slot)
+{
+ struct extent_buffer *eb;
+
+ eb = alloc_dummy_eb(src->start, src->len);
+ if (!eb) {
+ error("cannot sanitize name, not enough memory");
+ return;
+ }
+
+ memcpy(eb->data, dst, eb->len);
+
+ switch (key->type) {
+ case BTRFS_DIR_ITEM_KEY:
+ case BTRFS_DIR_INDEX_KEY:
+ sanitize_dir_item(md, eb, slot);
+ break;
+ case BTRFS_INODE_REF_KEY:
+ sanitize_inode_ref(md, eb, slot, 0);
+ break;
+ case BTRFS_INODE_EXTREF_KEY:
+ sanitize_inode_ref(md, eb, slot, 1);
+ break;
+ case BTRFS_XATTR_ITEM_KEY:
+ sanitize_xattr(md, eb, slot);
+ break;
+ default:
+ break;
+ }
+
+ memcpy(dst, eb->data, eb->len);
+ free(eb);
+}
+
/*
* zero inline extents and csum items
*/
-static void zero_items(u8 *dst, struct extent_buffer *src)
+static void zero_items(struct metadump_struct *md, u8 *dst,
+ struct extent_buffer *src)
{
struct btrfs_file_extent_item *fi;
struct btrfs_item *item;
int i, extent_type;
for (i = 0; i < nritems; i++) {
- item = btrfs_item_nr(src, i);
+ item = btrfs_item_nr(i);
btrfs_item_key_to_cpu(src, &key, i);
if (key.type == BTRFS_CSUM_ITEM_KEY) {
size = btrfs_item_size_nr(src, i);
btrfs_item_offset_nr(src, i), 0, size);
continue;
}
+
+ if (md->sanitize_names && has_name(&key)) {
+ sanitize_name(md, dst, src, &key, i);
+ continue;
+ }
+
if (key.type != BTRFS_EXTENT_DATA_KEY)
continue;
/*
* copy buffer and zero useless data in the buffer
*/
-static void copy_buffer(u8 *dst, struct extent_buffer *src)
+static void copy_buffer(struct metadump_struct *md, u8 *dst,
+ struct extent_buffer *src)
{
int level;
size_t size;
btrfs_item_offset_nr(src, nritems - 1) -
btrfs_item_nr_offset(nritems);
memset(dst + btrfs_item_nr_offset(nritems), 0, size);
- zero_items(dst, src);
+ zero_items(md, dst, src);
} else {
size = offsetof(struct btrfs_node, ptrs) +
sizeof(struct btrfs_key_ptr) * nritems;
async->bufsize = compressBound(async->size);
async->buffer = malloc(async->bufsize);
+ if (!async->buffer) {
+ error("not enough memory for async buffer");
+ pthread_mutex_lock(&md->mutex);
+ if (!md->error)
+ md->error = -ENOMEM;
+ pthread_mutex_unlock(&md->mutex);
+ pthread_exit(NULL);
+ }
ret = compress2(async->buffer,
(unsigned long *)&async->bufsize,
md->num_items = 0;
md->num_ready = 0;
- header = &md->cluster->header;
+ header = &md->cluster.header;
header->magic = cpu_to_le64(HEADER_MAGIC);
header->bytenr = cpu_to_le64(start);
header->nritems = cpu_to_le32(0);
COMPRESS_ZLIB : COMPRESS_NONE;
}
+static void metadump_destroy(struct metadump_struct *md, int num_threads)
+{
+ int i;
+ struct rb_node *n;
+
+ pthread_mutex_lock(&md->mutex);
+ md->done = 1;
+ pthread_cond_broadcast(&md->cond);
+ pthread_mutex_unlock(&md->mutex);
+
+ for (i = 0; i < num_threads; i++)
+ pthread_join(md->threads[i], NULL);
+
+ pthread_cond_destroy(&md->cond);
+ pthread_mutex_destroy(&md->mutex);
+
+ while ((n = rb_first(&md->name_tree))) {
+ struct name *name;
+
+ name = rb_entry(n, struct name, n);
+ rb_erase(n, &md->name_tree);
+ free(name->val);
+ free(name->sub);
+ free(name);
+ }
+}
+
static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
- FILE *out, int num_threads, int compress_level)
+ FILE *out, int num_threads, int compress_level,
+ int sanitize_names)
{
- int i, ret;
+ int i, ret = 0;
memset(md, 0, sizeof(*md));
- pthread_cond_init(&md->cond, NULL);
- pthread_mutex_init(&md->mutex, NULL);
INIT_LIST_HEAD(&md->list);
INIT_LIST_HEAD(&md->ordered);
md->root = root;
md->out = out;
md->pending_start = (u64)-1;
md->compress_level = compress_level;
- md->cluster = calloc(1, BLOCK_SIZE);
- if (!md->cluster) {
- pthread_cond_destroy(&md->cond);
- pthread_mutex_destroy(&md->mutex);
- return -ENOMEM;
- }
+ md->sanitize_names = sanitize_names;
+ if (sanitize_names > 1)
+ crc32c_optimization_init();
+ md->name_tree.rb_node = NULL;
+ md->num_threads = num_threads;
+ pthread_cond_init(&md->cond, NULL);
+ pthread_mutex_init(&md->mutex, NULL);
meta_cluster_init(md, 0);
+
if (!num_threads)
return 0;
- md->num_threads = num_threads;
- md->threads = calloc(num_threads, sizeof(pthread_t));
- if (!md->threads) {
- free(md->cluster);
- pthread_cond_destroy(&md->cond);
- pthread_mutex_destroy(&md->mutex);
- return -ENOMEM;
- }
-
for (i = 0; i < num_threads; i++) {
ret = pthread_create(md->threads + i, NULL, dump_worker, md);
if (ret)
break;
}
- if (ret) {
- pthread_mutex_lock(&md->mutex);
- md->done = 1;
- pthread_cond_broadcast(&md->cond);
- pthread_mutex_unlock(&md->mutex);
-
- for (i--; i >= 0; i--)
- pthread_join(md->threads[i], NULL);
-
- pthread_cond_destroy(&md->cond);
- pthread_mutex_destroy(&md->mutex);
- free(md->cluster);
- free(md->threads);
- }
+ if (ret)
+ metadump_destroy(md, i + 1);
return ret;
}
-static void metadump_destroy(struct metadump_struct *md)
-{
- int i;
- pthread_mutex_lock(&md->mutex);
- md->done = 1;
- pthread_cond_broadcast(&md->cond);
- pthread_mutex_unlock(&md->mutex);
-
- for (i = 0; i < md->num_threads; i++)
- pthread_join(md->threads[i], NULL);
-
- pthread_cond_destroy(&md->cond);
- pthread_mutex_destroy(&md->mutex);
- free(md->threads);
- free(md->cluster);
-}
-
static int write_zero(FILE *out, size_t size)
{
static char zero[BLOCK_SIZE];
static int write_buffers(struct metadump_struct *md, u64 *next)
{
- struct meta_cluster_header *header = &md->cluster->header;
+ struct meta_cluster_header *header = &md->cluster.header;
struct meta_cluster_item *item;
struct async_work *async;
u64 bytenr = 0;
goto out;
/* wait until all buffers are compressed */
- while (md->num_items > md->num_ready) {
+ while (!err && md->num_items > md->num_ready) {
struct timespec ts = {
.tv_sec = 0,
.tv_nsec = 10000000,
pthread_mutex_unlock(&md->mutex);
nanosleep(&ts, NULL);
pthread_mutex_lock(&md->mutex);
+ err = md->error;
+ }
+
+ if (err) {
+ error("one of the threads failed: %s", strerror(-err));
+ goto out;
}
/* setup and write index block */
list_for_each_entry(async, &md->ordered, ordered) {
- item = md->cluster->items + nritems;
+ item = &md->cluster.items[nritems];
item->bytenr = cpu_to_le64(async->start);
item->size = cpu_to_le32(async->bufsize);
nritems++;
}
header->nritems = cpu_to_le32(nritems);
- ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
+ ret = fwrite(&md->cluster, BLOCK_SIZE, 1, md->out);
if (ret != 1) {
- fprintf(stderr, "Error writing out cluster: %d\n", errno);
- return -EIO;
+ error("unable to write out cluster: %s", strerror(errno));
+ return -errno;
}
/* write buffers */
ret = fwrite(async->buffer, async->bufsize, 1,
md->out);
if (ret != 1) {
- err = -EIO;
+ error("unable to write out cluster: %s",
+ strerror(errno));
+ err = -errno;
ret = 0;
- fprintf(stderr, "Error writing out cluster: %d\n",
- errno);
}
free(async->buffer);
bytenr += size;
ret = write_zero(md->out, size);
if (ret != 1) {
- fprintf(stderr, "Error zeroing out buffer: %d\n",
- errno);
- err = -EIO;
+ error("unable to zero out buffer: %s",
+ strerror(errno));
+ err = -errno;
}
}
out:
return err;
}
+static int read_data_extent(struct metadump_struct *md,
+ struct async_work *async)
+{
+ struct btrfs_root *root = md->root;
+ u64 bytes_left = async->size;
+ u64 logical = async->start;
+ u64 offset = 0;
+ u64 read_len;
+ int num_copies;
+ int cur_mirror;
+ int ret;
+
+ num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, logical,
+ bytes_left);
+
+ /* Try our best to read data, just like read_tree_block() */
+ for (cur_mirror = 0; cur_mirror < num_copies; cur_mirror++) {
+ while (bytes_left) {
+ read_len = bytes_left;
+ ret = read_extent_data(root,
+ (char *)(async->buffer + offset),
+ logical, &read_len, cur_mirror);
+ if (ret < 0)
+ break;
+ offset += read_len;
+ logical += read_len;
+ bytes_left -= read_len;
+ }
+ }
+ if (bytes_left)
+ return -EIO;
+ return 0;
+}
+
+static int get_dev_fd(struct btrfs_root *root)
+{
+ struct btrfs_device *dev;
+
+ dev = list_first_entry(&root->fs_info->fs_devices->devices,
+ struct btrfs_device, dev_list);
+ return dev->fd;
+}
+
static int flush_pending(struct metadump_struct *md, int done)
{
struct async_work *async = NULL;
struct extent_buffer *eb;
u64 blocksize = md->root->nodesize;
- u64 start;
+ u64 start = 0;
u64 size;
size_t offset;
int ret = 0;
offset = 0;
start = async->start;
size = async->size;
- while (size > 0) {
- eb = read_tree_block(md->root, start, blocksize, 0);
- if (!eb) {
+
+ if (md->data) {
+ ret = read_data_extent(md, async);
+ if (ret) {
+ free(async->buffer);
+ free(async);
+ return ret;
+ }
+ }
+
+ /*
+ * Balance can make the mapping not cover the super block, so
+ * just copy directly from one of the devices.
+ */
+ if (start == BTRFS_SUPER_INFO_OFFSET) {
+ int fd = get_dev_fd(md->root);
+
+ ret = pread64(fd, async->buffer, size, start);
+ if (ret < size) {
+ free(async->buffer);
+ free(async);
+ error("unable to read superblock at %llu: %s",
+ (unsigned long long)start,
+ strerror(errno));
+ return -errno;
+ }
+ size = 0;
+ ret = 0;
+ }
+
+ while (!md->data && size > 0) {
+ u64 this_read = min(blocksize, size);
+ eb = read_tree_block(md->root, start, this_read, 0);
+ if (!extent_buffer_uptodate(eb)) {
free(async->buffer);
free(async);
- fprintf(stderr,
- "Error reading metadata block\n");
+ error("unable to read metadata block %llu",
+ (unsigned long long)start);
return -EIO;
}
- copy_buffer(async->buffer + offset, eb);
+ copy_buffer(md, async->buffer + offset, eb);
free_extent_buffer(eb);
- start += blocksize;
- offset += blocksize;
- size -= blocksize;
+ start += this_read;
+ offset += this_read;
+ size -= this_read;
}
md->pending_start = (u64)-1;
if (md->num_items >= ITEMS_PER_CLUSTER || done) {
ret = write_buffers(md, &start);
if (ret)
- fprintf(stderr, "Error writing buffers %d\n",
- errno);
+ error("unable to write buffers: %s", strerror(-ret));
else
meta_cluster_init(md, start);
}
return ret;
}
-static int add_metadata(u64 start, u64 size, struct metadump_struct *md)
+static int add_extent(u64 start, u64 size, struct metadump_struct *md,
+ int data)
{
int ret;
- if (md->pending_size + size > MAX_PENDING_SIZE ||
+ if (md->data != data ||
+ md->pending_size + size > MAX_PENDING_SIZE ||
md->pending_start + md->pending_size != start) {
ret = flush_pending(md, 0);
if (ret)
}
readahead_tree_block(md->root, start, size, 0);
md->pending_size += size;
+ md->data = data;
return 0;
}
}
#endif
-static int create_metadump(const char *input, FILE *out, int num_threads,
- int compress_level)
+static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
+ struct metadump_struct *metadump, int root_tree)
{
- struct btrfs_root *root;
- struct btrfs_root *extent_root;
- struct btrfs_path *path = NULL;
- struct extent_buffer *leaf;
- struct btrfs_extent_item *ei;
+ struct extent_buffer *tmp;
+ struct btrfs_root_item *ri;
struct btrfs_key key;
- struct metadump_struct metadump;
u64 bytenr;
- u64 num_bytes;
+ int level;
+ int nritems = 0;
+ int i = 0;
int ret;
- int err = 0;
-
- root = open_ctree(input, 0, 0);
- if (!root) {
- fprintf(stderr, "Open ctree failed\n");
- return -EIO;
- }
-
- BUG_ON(root->nodesize != root->leafsize);
- ret = metadump_init(&metadump, root, out, num_threads,
- compress_level);
+ ret = add_extent(btrfs_header_bytenr(eb), root->nodesize, metadump, 0);
if (ret) {
- fprintf(stderr, "Error initing metadump %d\n", ret);
- close_ctree(root);
+ error("unable to add metadata block %llu: %d",
+ btrfs_header_bytenr(eb), ret);
return ret;
}
- ret = add_metadata(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump);
- if (ret) {
- fprintf(stderr, "Error adding metadata %d\n", ret);
- err = ret;
- goto out;
- }
+ if (btrfs_header_level(eb) == 0 && !root_tree)
+ return 0;
- extent_root = root->fs_info->extent_root;
- path = btrfs_alloc_path();
- if (!path) {
- fprintf(stderr, "Out of memory allocing path\n");
- err = -ENOMEM;
- goto out;
- }
- bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
- key.objectid = bytenr;
- key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = 0;
+ level = btrfs_header_level(eb);
+ nritems = btrfs_header_nritems(eb);
+ for (i = 0; i < nritems; i++) {
+ if (level == 0) {
+ btrfs_item_key_to_cpu(eb, &key, i);
+ if (key.type != BTRFS_ROOT_ITEM_KEY)
+ continue;
+ ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
+ bytenr = btrfs_disk_root_bytenr(eb, ri);
+ tmp = read_tree_block(root, bytenr, root->nodesize, 0);
+ if (!extent_buffer_uptodate(tmp)) {
+ error("unable to read log root block");
+ return -EIO;
+ }
+ ret = copy_tree_blocks(root, tmp, metadump, 0);
+ free_extent_buffer(tmp);
+ if (ret)
+ return ret;
+ } else {
+ bytenr = btrfs_node_blockptr(eb, i);
+ tmp = read_tree_block(root, bytenr, root->nodesize, 0);
+ if (!extent_buffer_uptodate(tmp)) {
+ error("unable to read log root block");
+ return -EIO;
+ }
+ ret = copy_tree_blocks(root, tmp, metadump, root_tree);
+ free_extent_buffer(tmp);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int copy_log_trees(struct btrfs_root *root,
+ struct metadump_struct *metadump,
+ struct btrfs_path *path)
+{
+ u64 blocknr = btrfs_super_log_root(root->fs_info->super_copy);
+
+ if (blocknr == 0)
+ return 0;
+
+ if (!root->fs_info->log_root_tree ||
+ !root->fs_info->log_root_tree->node) {
+ error("unable to copy tree log, it has not been setup");
+ return -EIO;
+ }
+
+ return copy_tree_blocks(root, root->fs_info->log_root_tree->node,
+ metadump, 1);
+}
+
+static int copy_space_cache(struct btrfs_root *root,
+ struct metadump_struct *metadump,
+ struct btrfs_path *path)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 bytenr, num_bytes;
+ int ret;
+
+ root = root->fs_info->tree_root;
+
+ key.objectid = 0;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0) {
+ error("free space inode not found: %d", ret);
+ return ret;
+ }
+
+ leaf = path->nodes[0];
+
+ while (1) {
+ if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0) {
+ error("cannot go to next leaf %d", ret);
+ return ret;
+ }
+ if (ret > 0)
+ break;
+ leaf = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.type != BTRFS_EXTENT_DATA_KEY) {
+ path->slots[0]++;
+ continue;
+ }
+
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) !=
+ BTRFS_FILE_EXTENT_REG) {
+ path->slots[0]++;
+ continue;
+ }
+
+ bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ ret = add_extent(bytenr, num_bytes, metadump, 1);
+ if (ret) {
+ error("unable to add space cache blocks %d", ret);
+ btrfs_release_path(path);
+ return ret;
+ }
+ path->slots[0]++;
+ }
+
+ return 0;
+}
+
+static int copy_from_extent_tree(struct metadump_struct *metadump,
+ struct btrfs_path *path)
+{
+ struct btrfs_root *extent_root;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_item *ei;
+ struct btrfs_key key;
+ u64 bytenr;
+ u64 num_bytes;
+ int ret;
+
+ extent_root = metadump->root->fs_info->extent_root;
+ bytenr = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ key.offset = 0;
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0) {
- fprintf(stderr, "Error searching extent root %d\n", ret);
- err = ret;
- goto out;
+ error("extent root not found: %d", ret);
+ return ret;
}
+ ret = 0;
+
+ leaf = path->nodes[0];
while (1) {
- leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(extent_root, path);
if (ret < 0) {
- fprintf(stderr, "Error going to next leaf %d"
- "\n", ret);
- err = ret;
- goto out;
+ error("cannot go to next leaf %d", ret);
+ break;
}
- if (ret > 0)
+ if (ret > 0) {
+ ret = 0;
break;
+ }
leaf = path->nodes[0];
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
if (key.objectid < bytenr ||
- key.type != BTRFS_EXTENT_ITEM_KEY) {
+ (key.type != BTRFS_EXTENT_ITEM_KEY &&
+ key.type != BTRFS_METADATA_ITEM_KEY)) {
path->slots[0]++;
continue;
}
bytenr = key.objectid;
- num_bytes = key.offset;
+ if (key.type == BTRFS_METADATA_ITEM_KEY) {
+ num_bytes = extent_root->nodesize;
+ } else {
+ num_bytes = key.offset;
+ }
+
+ if (num_bytes == 0) {
+ error("extent length 0 at bytenr %llu key type %d",
+ (unsigned long long)bytenr, key.type);
+ ret = -EIO;
+ break;
+ }
if (btrfs_item_size_nr(leaf, path->slots[0]) > sizeof(*ei)) {
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
if (btrfs_extent_flags(leaf, ei) &
BTRFS_EXTENT_FLAG_TREE_BLOCK) {
- ret = add_metadata(bytenr, num_bytes,
- &metadump);
+ ret = add_extent(bytenr, num_bytes, metadump,
+ 0);
if (ret) {
- fprintf(stderr, "Error adding block "
- "%d\n", ret);
- err = ret;
- goto out;
+ error("unable to add block %llu: %d",
+ (unsigned long long)bytenr, ret);
+ break;
}
}
} else {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
ret = is_tree_block(extent_root, path, bytenr);
if (ret < 0) {
- fprintf(stderr, "Error checking tree block "
- "%d\n", ret);
- err = ret;
- goto out;
+ error("failed to check tree block %llu: %d",
+ (unsigned long long)bytenr, ret);
+ break;
}
if (ret) {
- ret = add_metadata(bytenr, num_bytes,
- &metadump);
+ ret = add_extent(bytenr, num_bytes, metadump,
+ 0);
if (ret) {
- fprintf(stderr, "Error adding block "
- "%d\n", ret);
- err = ret;
- goto out;
+ error("unable to add block %llu: %d",
+ (unsigned long long)bytenr, ret);
+ break;
}
}
+ ret = 0;
#else
- fprintf(stderr, "Either extent tree corruption or "
- "you haven't built with V0 support\n");
- err = -EIO;
- goto out;
+ error(
+ "either extent tree is corrupted or you haven't built with V0 support");
+ ret = -EIO;
+ break;
#endif
}
bytenr += num_bytes;
}
+ btrfs_release_path(path);
+
+ return ret;
+}
+
+static int create_metadump(const char *input, FILE *out, int num_threads,
+ int compress_level, int sanitize, int walk_trees)
+{
+ struct btrfs_root *root;
+ struct btrfs_path path;
+ struct metadump_struct metadump;
+ int ret;
+ int err = 0;
+
+ root = open_ctree(input, 0, 0);
+ if (!root) {
+ error("open ctree failed");
+ return -EIO;
+ }
+
+ ret = metadump_init(&metadump, root, out, num_threads,
+ compress_level, sanitize);
+ if (ret) {
+ error("failed to initialize metadump: %d", ret);
+ close_ctree(root);
+ return ret;
+ }
+
+ ret = add_extent(BTRFS_SUPER_INFO_OFFSET, BTRFS_SUPER_INFO_SIZE,
+ &metadump, 0);
+ if (ret) {
+ error("unable to add metadata: %d", ret);
+ err = ret;
+ goto out;
+ }
+
+ btrfs_init_path(&path);
+
+ if (walk_trees) {
+ ret = copy_tree_blocks(root, root->fs_info->chunk_root->node,
+ &metadump, 1);
+ if (ret) {
+ err = ret;
+ goto out;
+ }
+
+ ret = copy_tree_blocks(root, root->fs_info->tree_root->node,
+ &metadump, 1);
+ if (ret) {
+ err = ret;
+ goto out;
+ }
+ } else {
+ ret = copy_from_extent_tree(&metadump, &path);
+ if (ret) {
+ err = ret;
+ goto out;
+ }
+ }
+
+ ret = copy_log_trees(root, &metadump, &path);
+ if (ret) {
+ err = ret;
+ goto out;
+ }
+
+ ret = copy_space_cache(root, &metadump, &path);
out:
ret = flush_pending(&metadump, 1);
if (ret) {
if (!err)
- ret = err;
- fprintf(stderr, "Error flushing pending %d\n", ret);
+ err = ret;
+ error("failed to flush pending data: %d", ret);
}
- metadump_destroy(&metadump);
+ metadump_destroy(&metadump, num_threads);
- btrfs_free_path(path);
+ btrfs_release_path(&path);
ret = close_ctree(root);
return err ? err : ret;
}
-static void update_super(u8 *buffer)
+static void update_super_old(u8 *buffer)
{
struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
struct btrfs_chunk *chunk;
btrfs_set_stack_chunk_length(chunk, (u64)-1);
btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
+ btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
btrfs_set_stack_chunk_io_align(chunk, sectorsize);
btrfs_set_stack_chunk_io_width(chunk, sectorsize);
btrfs_set_stack_chunk_num_stripes(chunk, 1);
btrfs_set_stack_chunk_sub_stripes(chunk, 0);
chunk->stripe.devid = super->dev_item.devid;
- chunk->stripe.offset = cpu_to_le64(0);
+ btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
- csum_block(buffer, 4096);
+ csum_block(buffer, BTRFS_SUPER_INFO_SIZE);
+}
+
+static int update_super(struct mdrestore_struct *mdres, u8 *buffer)
+{
+ struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
+ struct btrfs_chunk *chunk;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_key key;
+ u64 flags = btrfs_super_flags(super);
+ u32 new_array_size = 0;
+ u32 array_size;
+ u32 cur = 0;
+ u8 *ptr, *write_ptr;
+ int old_num_stripes;
+
+ write_ptr = ptr = super->sys_chunk_array;
+ array_size = btrfs_super_sys_array_size(super);
+
+ while (cur < array_size) {
+ disk_key = (struct btrfs_disk_key *)ptr;
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ new_array_size += sizeof(*disk_key);
+ memmove(write_ptr, ptr, sizeof(*disk_key));
+
+ write_ptr += sizeof(*disk_key);
+ ptr += sizeof(*disk_key);
+ cur += sizeof(*disk_key);
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ u64 type, physical, physical_dup, size = 0;
+
+ chunk = (struct btrfs_chunk *)ptr;
+ old_num_stripes = btrfs_stack_chunk_num_stripes(chunk);
+ chunk = (struct btrfs_chunk *)write_ptr;
+
+ memmove(write_ptr, ptr, sizeof(*chunk));
+ btrfs_set_stack_chunk_sub_stripes(chunk, 0);
+ type = btrfs_stack_chunk_type(chunk);
+ if (type & BTRFS_BLOCK_GROUP_DUP) {
+ new_array_size += sizeof(struct btrfs_stripe);
+ write_ptr += sizeof(struct btrfs_stripe);
+ } else {
+ btrfs_set_stack_chunk_num_stripes(chunk, 1);
+ btrfs_set_stack_chunk_type(chunk,
+ BTRFS_BLOCK_GROUP_SYSTEM);
+ }
+ chunk->stripe.devid = super->dev_item.devid;
+ physical = logical_to_physical(mdres, key.offset,
+ &size, &physical_dup);
+ if (size != (u64)-1)
+ btrfs_set_stack_stripe_offset(&chunk->stripe,
+ physical);
+ memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ new_array_size += sizeof(*chunk);
+ } else {
+ error("bogus key in the sys array %d", key.type);
+ return -EIO;
+ }
+ write_ptr += sizeof(*chunk);
+ ptr += btrfs_chunk_item_size(old_num_stripes);
+ cur += btrfs_chunk_item_size(old_num_stripes);
+ }
+
+ if (mdres->clear_space_cache)
+ btrfs_set_super_cache_generation(super, 0);
+
+ flags |= BTRFS_SUPER_FLAG_METADUMP_V2;
+ btrfs_set_super_flags(super, flags);
+ btrfs_set_super_sys_array_size(super, new_array_size);
+ csum_block(buffer, BTRFS_SUPER_INFO_SIZE);
+
+ return 0;
+}
+
+static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size)
+{
+ struct extent_buffer *eb;
+
+ eb = calloc(1, sizeof(struct extent_buffer) + size);
+ if (!eb)
+ return NULL;
+
+ eb->start = bytenr;
+ eb->len = size;
+ return eb;
+}
+
+static void truncate_item(struct extent_buffer *eb, int slot, u32 new_size)
+{
+ struct btrfs_item *item;
+ u32 nritems;
+ u32 old_size;
+ u32 old_data_start;
+ u32 size_diff;
+ u32 data_end;
+ int i;
+
+ old_size = btrfs_item_size_nr(eb, slot);
+ if (old_size == new_size)
+ return;
+
+ nritems = btrfs_header_nritems(eb);
+ data_end = btrfs_item_offset_nr(eb, nritems - 1);
+
+ old_data_start = btrfs_item_offset_nr(eb, slot);
+ size_diff = old_size - new_size;
+
+ for (i = slot; i < nritems; i++) {
+ u32 ioff;
+ item = btrfs_item_nr(i);
+ ioff = btrfs_item_offset(eb, item);
+ btrfs_set_item_offset(eb, item, ioff + size_diff);
+ }
+
+ memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end + size_diff,
+ btrfs_leaf_data(eb) + data_end,
+ old_data_start + new_size - data_end);
+ item = btrfs_item_nr(slot);
+ btrfs_set_item_size(eb, item, new_size);
+}
+
+static int fixup_chunk_tree_block(struct mdrestore_struct *mdres,
+ struct async_work *async, u8 *buffer,
+ size_t size)
+{
+ struct extent_buffer *eb;
+ size_t size_left = size;
+ u64 bytenr = async->start;
+ int i;
+
+ if (size_left % mdres->nodesize)
+ return 0;
+
+ eb = alloc_dummy_eb(bytenr, mdres->nodesize);
+ if (!eb)
+ return -ENOMEM;
+
+ while (size_left) {
+ eb->start = bytenr;
+ memcpy(eb->data, buffer, mdres->nodesize);
+
+ if (btrfs_header_bytenr(eb) != bytenr)
+ break;
+ if (memcmp(mdres->fsid,
+ eb->data + offsetof(struct btrfs_header, fsid),
+ BTRFS_FSID_SIZE))
+ break;
+
+ if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID)
+ goto next;
+
+ if (btrfs_header_level(eb) != 0)
+ goto next;
+
+ for (i = 0; i < btrfs_header_nritems(eb); i++) {
+ struct btrfs_chunk *chunk;
+ struct btrfs_key key;
+ u64 type, physical, physical_dup, size = (u64)-1;
+
+ btrfs_item_key_to_cpu(eb, &key, i);
+ if (key.type != BTRFS_CHUNK_ITEM_KEY)
+ continue;
+
+ size = 0;
+ physical = logical_to_physical(mdres, key.offset,
+ &size, &physical_dup);
+
+ if (!physical_dup)
+ truncate_item(eb, i, sizeof(*chunk));
+ chunk = btrfs_item_ptr(eb, i, struct btrfs_chunk);
+
+
+ /* Zero out the RAID profile */
+ type = btrfs_chunk_type(eb, chunk);
+ type &= (BTRFS_BLOCK_GROUP_DATA |
+ BTRFS_BLOCK_GROUP_SYSTEM |
+ BTRFS_BLOCK_GROUP_METADATA |
+ BTRFS_BLOCK_GROUP_DUP);
+ btrfs_set_chunk_type(eb, chunk, type);
+
+ if (!physical_dup)
+ btrfs_set_chunk_num_stripes(eb, chunk, 1);
+ btrfs_set_chunk_sub_stripes(eb, chunk, 0);
+ btrfs_set_stripe_devid_nr(eb, chunk, 0, mdres->devid);
+ if (size != (u64)-1)
+ btrfs_set_stripe_offset_nr(eb, chunk, 0,
+ physical);
+ /* update stripe 2 offset */
+ if (physical_dup)
+ btrfs_set_stripe_offset_nr(eb, chunk, 1,
+ physical_dup);
+
+ write_extent_buffer(eb, mdres->uuid,
+ (unsigned long)btrfs_stripe_dev_uuid_nr(
+ chunk, 0),
+ BTRFS_UUID_SIZE);
+ }
+ memcpy(buffer, eb->data, eb->len);
+ csum_block(buffer, eb->len);
+next:
+ size_left -= mdres->nodesize;
+ buffer += mdres->nodesize;
+ bytenr += mdres->nodesize;
+ }
+
+ free(eb);
+ return 0;
+}
+
+static void write_backup_supers(int fd, u8 *buf)
+{
+ struct btrfs_super_block *super = (struct btrfs_super_block *)buf;
+ struct stat st;
+ u64 size;
+ u64 bytenr;
+ int i;
+ int ret;
+
+ if (fstat(fd, &st)) {
+ error(
+ "cannot stat restore point, won't be able to write backup supers: %s",
+ strerror(errno));
+ return;
+ }
+
+ size = btrfs_device_size(fd, &st);
+
+ for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ bytenr = btrfs_sb_offset(i);
+ if (bytenr + BTRFS_SUPER_INFO_SIZE > size)
+ break;
+ btrfs_set_super_bytenr(super, bytenr);
+ csum_block(buf, BTRFS_SUPER_INFO_SIZE);
+ ret = pwrite64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE) {
+ if (ret < 0)
+ error(
+ "problem writing out backup super block %d: %s",
+ i, strerror(errno));
+ else
+ error("short write writing out backup super block");
+ break;
+ }
+ }
}
static void *restore_worker(void *data)
u8 *outbuf;
int outfd;
int ret;
+ int compress_size = MAX_PENDING_SIZE * 4;
outfd = fileno(mdres->out);
- buffer = malloc(MAX_PENDING_SIZE * 2);
+ buffer = malloc(compress_size);
if (!buffer) {
- fprintf(stderr, "Error allocing buffer\n");
+ error("not enough memory for restore worker buffer");
pthread_mutex_lock(&mdres->mutex);
if (!mdres->error)
mdres->error = -ENOMEM;
pthread_mutex_unlock(&mdres->mutex);
- goto out;
+ pthread_exit(NULL);
}
while (1) {
+ u64 bytenr, physical_dup;
+ off_t offset = 0;
int err = 0;
pthread_mutex_lock(&mdres->mutex);
- while (list_empty(&mdres->list)) {
+ while (!mdres->nodesize || list_empty(&mdres->list)) {
if (mdres->done) {
pthread_mutex_unlock(&mdres->mutex);
goto out;
pthread_mutex_unlock(&mdres->mutex);
if (mdres->compress_method == COMPRESS_ZLIB) {
- size = MAX_PENDING_SIZE * 2;
+ size = compress_size;
ret = uncompress(buffer, (unsigned long *)&size,
async->buffer, async->bufsize);
if (ret != Z_OK) {
- fprintf(stderr, "Error decompressing %d\n",
- ret);
+ error("decompressiion failed with %d", ret);
err = -EIO;
}
outbuf = buffer;
size = async->bufsize;
}
- if (async->start == BTRFS_SUPER_INFO_OFFSET)
- update_super(outbuf);
+ if (!mdres->multi_devices) {
+ if (async->start == BTRFS_SUPER_INFO_OFFSET) {
+ if (mdres->old_restore) {
+ update_super_old(outbuf);
+ } else {
+ ret = update_super(mdres, outbuf);
+ if (ret)
+ err = ret;
+ }
+ } else if (!mdres->old_restore) {
+ ret = fixup_chunk_tree_block(mdres, async, outbuf, size);
+ if (ret)
+ err = ret;
+ }
+ }
- ret = pwrite64(outfd, outbuf, size, async->start);
- if (ret < size) {
- if (ret < 0) {
- fprintf(stderr, "Error writing to device %d\n",
- errno);
- err = errno;
- } else {
- fprintf(stderr, "Short write\n");
- err = -EIO;
+ if (!mdres->fixup_offset) {
+ while (size) {
+ u64 chunk_size = size;
+ physical_dup = 0;
+ if (!mdres->multi_devices && !mdres->old_restore)
+ bytenr = logical_to_physical(mdres,
+ async->start + offset,
+ &chunk_size,
+ &physical_dup);
+ else
+ bytenr = async->start + offset;
+
+ ret = pwrite64(outfd, outbuf+offset, chunk_size,
+ bytenr);
+ if (ret != chunk_size)
+ goto error;
+
+ if (physical_dup)
+ ret = pwrite64(outfd, outbuf+offset,
+ chunk_size,
+ physical_dup);
+ if (ret != chunk_size)
+ goto error;
+
+ size -= chunk_size;
+ offset += chunk_size;
+ continue;
+
+error:
+ if (ret < 0) {
+ error("unable to write to device: %s",
+ strerror(errno));
+ err = errno;
+ } else {
+ error("short write");
+ err = -EIO;
+ }
+ }
+ } else if (async->start != BTRFS_SUPER_INFO_OFFSET) {
+ ret = write_data_to_disk(mdres->info, outbuf, async->start, size, 0);
+ if (ret) {
+ error("failed to write data");
+ exit(1);
}
}
+
+ /* backup super blocks are already there at fixup_offset stage */
+ if (!mdres->multi_devices && async->start == BTRFS_SUPER_INFO_OFFSET)
+ write_backup_supers(outfd, outbuf);
+
pthread_mutex_lock(&mdres->mutex);
if (err && !mdres->error)
mdres->error = err;
pthread_exit(NULL);
}
-static void mdrestore_destroy(struct mdrestore_struct *mdres)
+static void mdrestore_destroy(struct mdrestore_struct *mdres, int num_threads)
{
+ struct rb_node *n;
int i;
+
+ while ((n = rb_first(&mdres->chunk_tree))) {
+ struct fs_chunk *entry;
+
+ entry = rb_entry(n, struct fs_chunk, l);
+ rb_erase(n, &mdres->chunk_tree);
+ rb_erase(&entry->p, &mdres->physical_tree);
+ free(entry);
+ }
pthread_mutex_lock(&mdres->mutex);
mdres->done = 1;
pthread_cond_broadcast(&mdres->cond);
pthread_mutex_unlock(&mdres->mutex);
- for (i = 0; i < mdres->num_threads; i++)
+ for (i = 0; i < num_threads; i++)
pthread_join(mdres->threads[i], NULL);
pthread_cond_destroy(&mdres->cond);
pthread_mutex_destroy(&mdres->mutex);
- free(mdres->threads);
}
static int mdrestore_init(struct mdrestore_struct *mdres,
- FILE *in, FILE *out, int num_threads)
+ FILE *in, FILE *out, int old_restore,
+ int num_threads, int fixup_offset,
+ struct btrfs_fs_info *info, int multi_devices)
{
int i, ret = 0;
pthread_cond_init(&mdres->cond, NULL);
pthread_mutex_init(&mdres->mutex, NULL);
INIT_LIST_HEAD(&mdres->list);
+ INIT_LIST_HEAD(&mdres->overlapping_chunks);
mdres->in = in;
mdres->out = out;
+ mdres->old_restore = old_restore;
+ mdres->chunk_tree.rb_node = NULL;
+ mdres->fixup_offset = fixup_offset;
+ mdres->info = info;
+ mdres->multi_devices = multi_devices;
+ mdres->clear_space_cache = 0;
+ mdres->last_physical_offset = 0;
+ mdres->alloced_chunks = 0;
if (!num_threads)
return 0;
mdres->num_threads = num_threads;
- mdres->threads = calloc(num_threads, sizeof(pthread_t));
- if (!mdres->threads)
- return -ENOMEM;
for (i = 0; i < num_threads; i++) {
- ret = pthread_create(mdres->threads + i, NULL, restore_worker,
+ ret = pthread_create(&mdres->threads[i], NULL, restore_worker,
mdres);
- if (ret)
+ if (ret) {
+ /* pthread_create returns errno directly */
+ ret = -ret;
break;
+ }
}
if (ret)
- mdrestore_destroy(mdres);
+ mdrestore_destroy(mdres, i + 1);
return ret;
}
+static int fill_mdres_info(struct mdrestore_struct *mdres,
+ struct async_work *async)
+{
+ struct btrfs_super_block *super;
+ u8 *buffer = NULL;
+ u8 *outbuf;
+ int ret;
+
+ /* We've already been initialized */
+ if (mdres->nodesize)
+ return 0;
+
+ if (mdres->compress_method == COMPRESS_ZLIB) {
+ size_t size = MAX_PENDING_SIZE * 2;
+
+ buffer = malloc(MAX_PENDING_SIZE * 2);
+ if (!buffer)
+ return -ENOMEM;
+ ret = uncompress(buffer, (unsigned long *)&size,
+ async->buffer, async->bufsize);
+ if (ret != Z_OK) {
+ error("decompressiion failed with %d", ret);
+ free(buffer);
+ return -EIO;
+ }
+ outbuf = buffer;
+ } else {
+ outbuf = async->buffer;
+ }
+
+ super = (struct btrfs_super_block *)outbuf;
+ mdres->nodesize = btrfs_super_nodesize(super);
+ memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
+ memcpy(mdres->uuid, super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ mdres->devid = le64_to_cpu(super->dev_item.devid);
+ free(buffer);
+ return 0;
+}
+
static int add_cluster(struct meta_cluster *cluster,
struct mdrestore_struct *mdres, u64 *next)
{
u32 i, nritems;
int ret;
- BUG_ON(mdres->num_items);
mdres->compress_method = header->compress;
bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
item = &cluster->items[i];
async = calloc(1, sizeof(*async));
if (!async) {
- fprintf(stderr, "Error allocating async\n");
+ error("not enough memory for async data");
return -ENOMEM;
}
async->start = le64_to_cpu(item->bytenr);
async->bufsize = le32_to_cpu(item->size);
async->buffer = malloc(async->bufsize);
if (!async->buffer) {
- fprintf(stderr, "Error allocing async buffer\n");
+ error("not enough memory for async buffer");
free(async);
return -ENOMEM;
}
ret = fread(async->buffer, async->bufsize, 1, mdres->in);
if (ret != 1) {
- fprintf(stderr, "Error reading buffer %d\n", errno);
+ error("unable to read buffer: %s", strerror(errno));
free(async->buffer);
free(async);
return -EIO;
bytenr += async->bufsize;
pthread_mutex_lock(&mdres->mutex);
+ if (async->start == BTRFS_SUPER_INFO_OFFSET) {
+ ret = fill_mdres_info(mdres, async);
+ if (ret) {
+ error("unable to set up restore state");
+ pthread_mutex_unlock(&mdres->mutex);
+ free(async->buffer);
+ free(async);
+ return ret;
+ }
+ }
list_add_tail(&async->list, &mdres->list);
mdres->num_items++;
pthread_cond_signal(&mdres->cond);
bytenr += size;
ret = fread(buffer, size, 1, mdres->in);
if (ret != 1) {
- fprintf(stderr, "Error reading in buffer %d\n", errno);
+ error("failed to read buffer: %s", strerror(errno));
return -EIO;
}
}
return ret;
}
-static int restore_metadump(const char *input, FILE *out, int num_threads)
+static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
+ u64 bytenr, u64 item_bytenr, u32 bufsize,
+ u64 cluster_bytenr)
+{
+ struct extent_buffer *eb;
+ int ret = 0;
+ int i;
+
+ eb = alloc_dummy_eb(bytenr, mdres->nodesize);
+ if (!eb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ while (item_bytenr != bytenr) {
+ buffer += mdres->nodesize;
+ item_bytenr += mdres->nodesize;
+ }
+
+ memcpy(eb->data, buffer, mdres->nodesize);
+ if (btrfs_header_bytenr(eb) != bytenr) {
+ error("eb bytenr does not match found bytenr: %llu != %llu",
+ (unsigned long long)btrfs_header_bytenr(eb),
+ (unsigned long long)bytenr);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
+ BTRFS_FSID_SIZE)) {
+ error("filesystem UUID of eb %llu does not match",
+ (unsigned long long)bytenr);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID) {
+ error("wrong eb %llu owner %llu",
+ (unsigned long long)bytenr,
+ (unsigned long long)btrfs_header_owner(eb));
+ ret = -EIO;
+ goto out;
+ }
+
+ for (i = 0; i < btrfs_header_nritems(eb); i++) {
+ struct btrfs_chunk *chunk;
+ struct fs_chunk *fs_chunk;
+ struct btrfs_key key;
+ u64 type;
+
+ if (btrfs_header_level(eb)) {
+ u64 blockptr = btrfs_node_blockptr(eb, i);
+
+ ret = search_for_chunk_blocks(mdres, blockptr,
+ cluster_bytenr);
+ if (ret)
+ break;
+ continue;
+ }
+
+ /* Yay a leaf! We loves leafs! */
+ btrfs_item_key_to_cpu(eb, &key, i);
+ if (key.type != BTRFS_CHUNK_ITEM_KEY)
+ continue;
+
+ fs_chunk = malloc(sizeof(struct fs_chunk));
+ if (!fs_chunk) {
+ error("not enough memory to allocate chunk");
+ ret = -ENOMEM;
+ break;
+ }
+ memset(fs_chunk, 0, sizeof(*fs_chunk));
+ chunk = btrfs_item_ptr(eb, i, struct btrfs_chunk);
+
+ fs_chunk->logical = key.offset;
+ fs_chunk->physical = btrfs_stripe_offset_nr(eb, chunk, 0);
+ fs_chunk->bytes = btrfs_chunk_length(eb, chunk);
+ INIT_LIST_HEAD(&fs_chunk->list);
+ if (tree_search(&mdres->physical_tree, &fs_chunk->p,
+ physical_cmp, 1) != NULL)
+ list_add(&fs_chunk->list, &mdres->overlapping_chunks);
+ else
+ tree_insert(&mdres->physical_tree, &fs_chunk->p,
+ physical_cmp);
+
+ type = btrfs_chunk_type(eb, chunk);
+ if (type & BTRFS_BLOCK_GROUP_DUP) {
+ fs_chunk->physical_dup =
+ btrfs_stripe_offset_nr(eb, chunk, 1);
+ }
+
+ if (fs_chunk->physical_dup + fs_chunk->bytes >
+ mdres->last_physical_offset)
+ mdres->last_physical_offset = fs_chunk->physical_dup +
+ fs_chunk->bytes;
+ else if (fs_chunk->physical + fs_chunk->bytes >
+ mdres->last_physical_offset)
+ mdres->last_physical_offset = fs_chunk->physical +
+ fs_chunk->bytes;
+ mdres->alloced_chunks += fs_chunk->bytes;
+ /* in dup case, fs_chunk->bytes should add twice */
+ if (fs_chunk->physical_dup)
+ mdres->alloced_chunks += fs_chunk->bytes;
+ tree_insert(&mdres->chunk_tree, &fs_chunk->l, chunk_cmp);
+ }
+out:
+ free(eb);
+ return ret;
+}
+
+/* If you have to ask you aren't worthy */
+static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
+ u64 search, u64 cluster_bytenr)
+{
+ struct meta_cluster *cluster;
+ struct meta_cluster_header *header;
+ struct meta_cluster_item *item;
+ u64 current_cluster = cluster_bytenr, bytenr;
+ u64 item_bytenr;
+ u32 bufsize, nritems, i;
+ u32 max_size = MAX_PENDING_SIZE * 2;
+ u8 *buffer, *tmp = NULL;
+ int ret = 0;
+
+ cluster = malloc(BLOCK_SIZE);
+ if (!cluster) {
+ error("not enough memory for cluster");
+ return -ENOMEM;
+ }
+
+ buffer = malloc(max_size);
+ if (!buffer) {
+ error("not enough memory for buffer");
+ free(cluster);
+ return -ENOMEM;
+ }
+
+ if (mdres->compress_method == COMPRESS_ZLIB) {
+ tmp = malloc(max_size);
+ if (!tmp) {
+ error("not enough memory for buffer");
+ free(cluster);
+ free(buffer);
+ return -ENOMEM;
+ }
+ }
+
+ bytenr = current_cluster;
+ while (1) {
+ if (fseek(mdres->in, current_cluster, SEEK_SET)) {
+ error("seek failed: %s\n", strerror(errno));
+ ret = -EIO;
+ break;
+ }
+
+ ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
+ if (ret == 0) {
+ if (cluster_bytenr != 0) {
+ cluster_bytenr = 0;
+ current_cluster = 0;
+ bytenr = 0;
+ continue;
+ }
+ error(
+ "unknown state after reading cluster at %llu, probably crrupted data",
+ cluster_bytenr);
+ ret = -EIO;
+ break;
+ } else if (ret < 0) {
+ error("unable to read image at %llu: %s",
+ (unsigned long long)cluster_bytenr,
+ strerror(errno));
+ break;
+ }
+ ret = 0;
+
+ header = &cluster->header;
+ if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+ le64_to_cpu(header->bytenr) != current_cluster) {
+ error("bad header in metadump image");
+ ret = -EIO;
+ break;
+ }
+
+ bytenr += BLOCK_SIZE;
+ nritems = le32_to_cpu(header->nritems);
+ for (i = 0; i < nritems; i++) {
+ size_t size;
+
+ item = &cluster->items[i];
+ bufsize = le32_to_cpu(item->size);
+ item_bytenr = le64_to_cpu(item->bytenr);
+
+ if (bufsize > max_size) {
+ error("item %u too big: %u > %u", i, bufsize,
+ max_size);
+ ret = -EIO;
+ break;
+ }
+
+ if (mdres->compress_method == COMPRESS_ZLIB) {
+ ret = fread(tmp, bufsize, 1, mdres->in);
+ if (ret != 1) {
+ error("read error: %s", strerror(errno));
+ ret = -EIO;
+ break;
+ }
+
+ size = max_size;
+ ret = uncompress(buffer,
+ (unsigned long *)&size, tmp,
+ bufsize);
+ if (ret != Z_OK) {
+ error("decompressiion failed with %d",
+ ret);
+ ret = -EIO;
+ break;
+ }
+ } else {
+ ret = fread(buffer, bufsize, 1, mdres->in);
+ if (ret != 1) {
+ error("read error: %s",
+ strerror(errno));
+ ret = -EIO;
+ break;
+ }
+ size = bufsize;
+ }
+ ret = 0;
+
+ if (item_bytenr <= search &&
+ item_bytenr + size > search) {
+ ret = read_chunk_block(mdres, buffer, search,
+ item_bytenr, size,
+ current_cluster);
+ if (!ret)
+ ret = 1;
+ break;
+ }
+ bytenr += bufsize;
+ }
+ if (ret) {
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+ if (bytenr & BLOCK_MASK)
+ bytenr += BLOCK_SIZE - (bytenr & BLOCK_MASK);
+ current_cluster = bytenr;
+ }
+
+ free(tmp);
+ free(buffer);
+ free(cluster);
+ return ret;
+}
+
+static int build_chunk_tree(struct mdrestore_struct *mdres,
+ struct meta_cluster *cluster)
+{
+ struct btrfs_super_block *super;
+ struct meta_cluster_header *header;
+ struct meta_cluster_item *item = NULL;
+ u64 chunk_root_bytenr = 0;
+ u32 i, nritems;
+ u64 bytenr = 0;
+ u8 *buffer;
+ int ret;
+
+ /* We can't seek with stdin so don't bother doing this */
+ if (mdres->in == stdin)
+ return 0;
+
+ ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
+ if (ret <= 0) {
+ error("unable to read cluster: %s", strerror(errno));
+ return -EIO;
+ }
+ ret = 0;
+
+ header = &cluster->header;
+ if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+ le64_to_cpu(header->bytenr) != 0) {
+ error("bad header in metadump image");
+ return -EIO;
+ }
+
+ bytenr += BLOCK_SIZE;
+ mdres->compress_method = header->compress;
+ nritems = le32_to_cpu(header->nritems);
+ for (i = 0; i < nritems; i++) {
+ item = &cluster->items[i];
+
+ if (le64_to_cpu(item->bytenr) == BTRFS_SUPER_INFO_OFFSET)
+ break;
+ bytenr += le32_to_cpu(item->size);
+ if (fseek(mdres->in, le32_to_cpu(item->size), SEEK_CUR)) {
+ error("seek failed: %s\n", strerror(errno));
+ return -EIO;
+ }
+ }
+
+ if (!item || le64_to_cpu(item->bytenr) != BTRFS_SUPER_INFO_OFFSET) {
+ error("did not find superblock at %llu",
+ le64_to_cpu(item->bytenr));
+ return -EINVAL;
+ }
+
+ buffer = malloc(le32_to_cpu(item->size));
+ if (!buffer) {
+ error("not enough memory to allocate buffer");
+ return -ENOMEM;
+ }
+
+ ret = fread(buffer, le32_to_cpu(item->size), 1, mdres->in);
+ if (ret != 1) {
+ error("unable to read buffer: %s", strerror(errno));
+ free(buffer);
+ return -EIO;
+ }
+
+ if (mdres->compress_method == COMPRESS_ZLIB) {
+ size_t size = MAX_PENDING_SIZE * 2;
+ u8 *tmp;
+
+ tmp = malloc(MAX_PENDING_SIZE * 2);
+ if (!tmp) {
+ free(buffer);
+ return -ENOMEM;
+ }
+ ret = uncompress(tmp, (unsigned long *)&size,
+ buffer, le32_to_cpu(item->size));
+ if (ret != Z_OK) {
+ error("decompressiion failed with %d", ret);
+ free(buffer);
+ free(tmp);
+ return -EIO;
+ }
+ free(buffer);
+ buffer = tmp;
+ }
+
+ pthread_mutex_lock(&mdres->mutex);
+ super = (struct btrfs_super_block *)buffer;
+ chunk_root_bytenr = btrfs_super_chunk_root(super);
+ mdres->nodesize = btrfs_super_nodesize(super);
+ memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
+ memcpy(mdres->uuid, super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ mdres->devid = le64_to_cpu(super->dev_item.devid);
+ free(buffer);
+ pthread_mutex_unlock(&mdres->mutex);
+
+ return search_for_chunk_blocks(mdres, chunk_root_bytenr, 0);
+}
+
+static int range_contains_super(u64 physical, u64 bytes)
+{
+ u64 super_bytenr;
+ int i;
+
+ for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ super_bytenr = btrfs_sb_offset(i);
+ if (super_bytenr >= physical &&
+ super_bytenr < physical + bytes)
+ return 1;
+ }
+
+ return 0;
+}
+
+static void remap_overlapping_chunks(struct mdrestore_struct *mdres)
+{
+ struct fs_chunk *fs_chunk;
+
+ while (!list_empty(&mdres->overlapping_chunks)) {
+ fs_chunk = list_first_entry(&mdres->overlapping_chunks,
+ struct fs_chunk, list);
+ list_del_init(&fs_chunk->list);
+ if (range_contains_super(fs_chunk->physical,
+ fs_chunk->bytes)) {
+ warning(
+"remapping a chunk that had a super mirror inside of it, clearing space cache so we don't end up with corruption");
+ mdres->clear_space_cache = 1;
+ }
+ fs_chunk->physical = mdres->last_physical_offset;
+ tree_insert(&mdres->physical_tree, &fs_chunk->p, physical_cmp);
+ mdres->last_physical_offset += fs_chunk->bytes;
+ }
+}
+
+static int fixup_devices(struct btrfs_fs_info *fs_info,
+ struct mdrestore_struct *mdres, off_t dev_size)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_path path;
+ struct extent_buffer *leaf;
+ struct btrfs_root *root = fs_info->chunk_root;
+ struct btrfs_key key;
+ u64 devid, cur_devid;
+ int ret;
+
+ trans = btrfs_start_transaction(fs_info->tree_root, 1);
+ if (IS_ERR(trans)) {
+ error("cannot starting transaction %ld", PTR_ERR(trans));
+ return PTR_ERR(trans);
+ }
+
+ dev_item = &fs_info->super_copy->dev_item;
+
+ devid = btrfs_stack_device_id(dev_item);
+
+ btrfs_set_stack_device_total_bytes(dev_item, dev_size);
+ btrfs_set_stack_device_bytes_used(dev_item, mdres->alloced_chunks);
+
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.type = BTRFS_DEV_ITEM_KEY;
+ key.offset = 0;
+
+ btrfs_init_path(&path);
+
+again:
+ ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
+ if (ret < 0) {
+ error("search failed: %d", ret);
+ exit(1);
+ }
+
+ while (1) {
+ leaf = path.nodes[0];
+ if (path.slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, &path);
+ if (ret < 0) {
+ error("cannot go to next leaf %d", ret);
+ exit(1);
+ }
+ if (ret > 0) {
+ ret = 0;
+ break;
+ }
+ leaf = path.nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
+ if (key.type > BTRFS_DEV_ITEM_KEY)
+ break;
+ if (key.type != BTRFS_DEV_ITEM_KEY) {
+ path.slots[0]++;
+ continue;
+ }
+
+ dev_item = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_dev_item);
+ cur_devid = btrfs_device_id(leaf, dev_item);
+ if (devid != cur_devid) {
+ ret = btrfs_del_item(trans, root, &path);
+ if (ret) {
+ error("cannot delete item: %d", ret);
+ exit(1);
+ }
+ btrfs_release_path(&path);
+ goto again;
+ }
+
+ btrfs_set_device_total_bytes(leaf, dev_item, dev_size);
+ btrfs_set_device_bytes_used(leaf, dev_item,
+ mdres->alloced_chunks);
+ btrfs_mark_buffer_dirty(leaf);
+ path.slots[0]++;
+ }
+
+ btrfs_release_path(&path);
+ ret = btrfs_commit_transaction(trans, fs_info->tree_root);
+ if (ret) {
+ error("unable to commit transaction: %d", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static int restore_metadump(const char *input, FILE *out, int old_restore,
+ int num_threads, int fixup_offset,
+ const char *target, int multi_devices)
{
struct meta_cluster *cluster = NULL;
struct meta_cluster_header *header;
struct mdrestore_struct mdrestore;
+ struct btrfs_fs_info *info = NULL;
u64 bytenr = 0;
FILE *in = NULL;
int ret = 0;
} else {
in = fopen(input, "r");
if (!in) {
- perror("unable to open metadump image");
+ error("unable to open metadump image: %s",
+ strerror(errno));
return 1;
}
}
+ /* NOTE: open with write mode */
+ if (fixup_offset) {
+ info = open_ctree_fs_info(target, 0, 0, 0,
+ OPEN_CTREE_WRITES |
+ OPEN_CTREE_RESTORE |
+ OPEN_CTREE_PARTIAL);
+ if (!info) {
+ error("open ctree failed");
+ ret = -EIO;
+ goto failed_open;
+ }
+ }
+
cluster = malloc(BLOCK_SIZE);
if (!cluster) {
- fprintf(stderr, "Error allocating cluster\n");
- if (in != stdin)
- fclose(in);
- return -ENOMEM;
+ error("not enough memory for cluster");
+ ret = -ENOMEM;
+ goto failed_info;
}
- ret = mdrestore_init(&mdrestore, in, out, num_threads);
+ ret = mdrestore_init(&mdrestore, in, out, old_restore, num_threads,
+ fixup_offset, info, multi_devices);
if (ret) {
- fprintf(stderr, "Error initing mdrestore %d\n", ret);
- if (in != stdin)
- fclose(in);
- free(cluster);
- return ret;
+ error("failed to intialize metadata restore state: %d", ret);
+ goto failed_cluster;
}
- while (1) {
+ if (!multi_devices && !old_restore) {
+ ret = build_chunk_tree(&mdrestore, cluster);
+ if (ret)
+ goto out;
+ if (!list_empty(&mdrestore.overlapping_chunks))
+ remap_overlapping_chunks(&mdrestore);
+ }
+
+ if (in != stdin && fseek(in, 0, SEEK_SET)) {
+ error("seek failed: %s\n", strerror(errno));
+ goto out;
+ }
+
+ while (!mdrestore.error) {
ret = fread(cluster, BLOCK_SIZE, 1, in);
if (!ret)
break;
header = &cluster->header;
if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
le64_to_cpu(header->bytenr) != bytenr) {
- fprintf(stderr, "bad header in metadump image\n");
+ error("bad header in metadump image");
ret = -EIO;
break;
}
ret = add_cluster(cluster, &mdrestore, &bytenr);
if (ret) {
- fprintf(stderr, "Error adding cluster\n");
+ error("failed to add cluster: %d", ret);
break;
}
+ }
+ ret = wait_for_worker(&mdrestore);
+
+ if (!ret && !multi_devices && !old_restore) {
+ struct btrfs_root *root;
+ struct stat st;
+
+ root = open_ctree_fd(fileno(out), target, 0,
+ OPEN_CTREE_PARTIAL |
+ OPEN_CTREE_WRITES |
+ OPEN_CTREE_NO_DEVICES);
+ if (!root) {
+ error("open ctree failed in %s", target);
+ ret = -EIO;
+ goto out;
+ }
+ info = root->fs_info;
- ret = wait_for_worker(&mdrestore);
- if (ret) {
- fprintf(stderr, "One of the threads errored out %d\n",
- ret);
- break;
+ if (stat(target, &st)) {
+ error("stat %s failed: %s", target, strerror(errno));
+ close_ctree(info->chunk_root);
+ free(cluster);
+ return 1;
}
- }
- mdrestore_destroy(&mdrestore);
+ ret = fixup_devices(info, &mdrestore, st.st_size);
+ close_ctree(info->chunk_root);
+ if (ret)
+ goto out;
+ }
+out:
+ mdrestore_destroy(&mdrestore, num_threads);
+failed_cluster:
free(cluster);
+failed_info:
+ if (fixup_offset && info)
+ close_ctree(info->chunk_root);
+failed_open:
if (in != stdin)
fclose(in);
return ret;
}
-static void print_usage(void)
+static int update_disk_super_on_device(struct btrfs_fs_info *info,
+ const char *other_dev, u64 cur_devid)
{
- fprintf(stderr, "usage: btrfs-image [options] source target\n");
- fprintf(stderr, "\t-r \trestore metadump image\n");
- fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
- fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
- exit(1);
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ struct btrfs_path path;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_super_block *disk_super;
+ char dev_uuid[BTRFS_UUID_SIZE];
+ char fs_uuid[BTRFS_UUID_SIZE];
+ u64 devid, type, io_align, io_width;
+ u64 sector_size, total_bytes, bytes_used;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+ int fp = -1;
+ int ret;
+
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.type = BTRFS_DEV_ITEM_KEY;
+ key.offset = cur_devid;
+
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0);
+ if (ret) {
+ error("search key failed: %d", ret);
+ ret = -EIO;
+ goto out;
+ }
+
+ leaf = path.nodes[0];
+ dev_item = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_dev_item);
+
+ devid = btrfs_device_id(leaf, dev_item);
+ if (devid != cur_devid) {
+ error("devid mismatch: %llu != %llu",
+ (unsigned long long)devid,
+ (unsigned long long)cur_devid);
+ ret = -EIO;
+ goto out;
+ }
+
+ type = btrfs_device_type(leaf, dev_item);
+ io_align = btrfs_device_io_align(leaf, dev_item);
+ io_width = btrfs_device_io_width(leaf, dev_item);
+ sector_size = btrfs_device_sector_size(leaf, dev_item);
+ total_bytes = btrfs_device_total_bytes(leaf, dev_item);
+ bytes_used = btrfs_device_bytes_used(leaf, dev_item);
+ read_extent_buffer(leaf, dev_uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE);
+ read_extent_buffer(leaf, fs_uuid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_UUID_SIZE);
+
+ btrfs_release_path(&path);
+
+ printf("update disk super on %s devid=%llu\n", other_dev, devid);
+
+ /* update other devices' super block */
+ fp = open(other_dev, O_CREAT | O_RDWR, 0600);
+ if (fp < 0) {
+ error("could not open %s: %s", other_dev, strerror(errno));
+ ret = -EIO;
+ goto out;
+ }
+
+ memcpy(buf, info->super_copy, BTRFS_SUPER_INFO_SIZE);
+
+ disk_super = (struct btrfs_super_block *)buf;
+ dev_item = &disk_super->dev_item;
+
+ btrfs_set_stack_device_type(dev_item, type);
+ btrfs_set_stack_device_id(dev_item, devid);
+ btrfs_set_stack_device_total_bytes(dev_item, total_bytes);
+ btrfs_set_stack_device_bytes_used(dev_item, bytes_used);
+ btrfs_set_stack_device_io_align(dev_item, io_align);
+ btrfs_set_stack_device_io_width(dev_item, io_width);
+ btrfs_set_stack_device_sector_size(dev_item, sector_size);
+ memcpy(dev_item->uuid, dev_uuid, BTRFS_UUID_SIZE);
+ memcpy(dev_item->fsid, fs_uuid, BTRFS_UUID_SIZE);
+ csum_block((u8 *)buf, BTRFS_SUPER_INFO_SIZE);
+
+ ret = pwrite64(fp, buf, BTRFS_SUPER_INFO_SIZE, BTRFS_SUPER_INFO_OFFSET);
+ if (ret != BTRFS_SUPER_INFO_SIZE) {
+ if (ret < 0)
+ error("cannot write superblock: %s", strerror(ret));
+ else
+ error("cannot write superblock");
+ ret = -EIO;
+ goto out;
+ }
+
+ write_backup_supers(fp, (u8 *)buf);
+
+out:
+ if (fp != -1)
+ close(fp);
+ return ret;
+}
+
+static void print_usage(int ret)
+{
+ printf("usage: btrfs-image [options] source target\n");
+ printf("\t-r \trestore metadump image\n");
+ printf("\t-c value\tcompression level (0 ~ 9)\n");
+ printf("\t-t value\tnumber of threads (1 ~ 32)\n");
+ printf("\t-o \tdon't mess with the chunk tree when restoring\n");
+ printf("\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
+ printf("\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
+ printf("\t-m \trestore for multiple devices\n");
+ printf("\n");
+ printf("\tIn the dump mode, source is the btrfs device and target is the output file (use '-' for stdout).\n");
+ printf("\tIn the restore mode, source is the dumped image and target is the btrfs device/file.\n");
+ exit(ret);
}
int main(int argc, char *argv[])
{
char *source;
char *target;
- int num_threads = 0;
- int compress_level = 0;
+ u64 num_threads = 0;
+ u64 compress_level = 0;
int create = 1;
+ int old_restore = 0;
+ int walk_trees = 0;
+ int multi_devices = 0;
int ret;
+ int sanitize = 0;
+ int dev_cnt = 0;
+ int usage_error = 0;
FILE *out;
while (1) {
- int c = getopt(argc, argv, "rc:t:");
+ static const struct option long_options[] = {
+ { "help", no_argument, NULL, GETOPT_VAL_HELP},
+ { NULL, 0, NULL, 0 }
+ };
+ int c = getopt_long(argc, argv, "rc:t:oswm", long_options, NULL);
if (c < 0)
break;
switch (c) {
create = 0;
break;
case 't':
- num_threads = atoi(optarg);
- if (num_threads <= 0 || num_threads > 32)
- print_usage();
+ num_threads = arg_strtou64(optarg);
+ if (num_threads > MAX_WORKER_THREADS) {
+ error("number of threads out of range: %llu > %d",
+ (unsigned long long)num_threads,
+ MAX_WORKER_THREADS);
+ return 1;
+ }
break;
case 'c':
- compress_level = atoi(optarg);
- if (compress_level < 0 || compress_level > 9)
- print_usage();
+ compress_level = arg_strtou64(optarg);
+ if (compress_level > 9) {
+ error("compression level out of range: %llu",
+ (unsigned long long)compress_level);
+ return 1;
+ }
+ break;
+ case 'o':
+ old_restore = 1;
+ break;
+ case 's':
+ sanitize++;
+ break;
+ case 'w':
+ walk_trees = 1;
break;
+ case 'm':
+ create = 0;
+ multi_devices = 1;
+ break;
+ case GETOPT_VAL_HELP:
default:
- print_usage();
+ print_usage(c != GETOPT_VAL_HELP);
}
}
- argc = argc - optind;
- if (argc != 2)
- print_usage();
+ set_argv0(argv);
+ if (check_argc_min(argc - optind, 2))
+ print_usage(1);
+
+ dev_cnt = argc - optind - 1;
+
+ if (create) {
+ if (old_restore) {
+ error(
+ "create and restore cannot be used at the same time");
+ usage_error++;
+ }
+ } else {
+ if (walk_trees || sanitize || compress_level) {
+ error(
+ "useing -w, -s, -c options for restore makes no sense");
+ usage_error++;
+ }
+ if (multi_devices && dev_cnt < 2) {
+ error("not enough devices specified for -m option");
+ usage_error++;
+ }
+ if (!multi_devices && dev_cnt != 1) {
+ error("accepts only 1 device without -m option");
+ usage_error++;
+ }
+ }
+
+ if (usage_error)
+ print_usage(1);
+
source = argv[optind];
target = argv[optind + 1];
} else {
out = fopen(target, "w+");
if (!out) {
- perror("unable to create target file");
+ error("unable to create target file %s", target);
exit(1);
}
}
- if (num_threads == 0 && compress_level > 0) {
- num_threads = sysconf(_SC_NPROCESSORS_ONLN);
- if (num_threads <= 0)
- num_threads = 1;
+ if (compress_level > 0 || create == 0) {
+ if (num_threads == 0) {
+ long tmp = sysconf(_SC_NPROCESSORS_ONLN);
+
+ if (tmp <= 0)
+ tmp = 1;
+ num_threads = tmp;
+ }
+ } else {
+ num_threads = 0;
}
- if (create)
+ if (create) {
+ ret = check_mounted(source);
+ if (ret < 0) {
+ warning("unable to check mount status of: %s",
+ strerror(-ret));
+ } else if (ret) {
+ warning("%s already mounted, results may be inaccurate",
+ source);
+ }
+
ret = create_metadump(source, out, num_threads,
- compress_level);
- else
- ret = restore_metadump(source, out, 1);
+ compress_level, sanitize, walk_trees);
+ } else {
+ ret = restore_metadump(source, out, old_restore, num_threads,
+ 0, target, multi_devices);
+ }
+ if (ret) {
+ error("%s failed: %s", (create) ? "create" : "restore",
+ strerror(errno));
+ goto out;
+ }
+
+ /* extended support for multiple devices */
+ if (!create && multi_devices) {
+ struct btrfs_fs_info *info;
+ u64 total_devs;
+ int i;
+
+ info = open_ctree_fs_info(target, 0, 0, 0,
+ OPEN_CTREE_PARTIAL |
+ OPEN_CTREE_RESTORE);
+ if (!info) {
+ error("open ctree failed at %s", target);
+ return 1;
+ }
- if (out == stdout)
+ total_devs = btrfs_super_num_devices(info->super_copy);
+ if (total_devs != dev_cnt) {
+ error("it needs %llu devices but has only %d",
+ total_devs, dev_cnt);
+ close_ctree(info->chunk_root);
+ goto out;
+ }
+
+ /* update super block on other disks */
+ for (i = 2; i <= dev_cnt; i++) {
+ ret = update_disk_super_on_device(info,
+ argv[optind + i], (u64)i);
+ if (ret) {
+ error("update disk superblock failed devid %d: %d",
+ i, ret);
+ close_ctree(info->chunk_root);
+ exit(1);
+ }
+ }
+
+ close_ctree(info->chunk_root);
+
+ /* fix metadata block to map correct chunk */
+ ret = restore_metadump(source, out, 0, num_threads, 1,
+ target, 1);
+ if (ret) {
+ error("unable to fixup metadump: %d", ret);
+ exit(1);
+ }
+ }
+out:
+ if (out == stdout) {
fflush(out);
- else
+ } else {
fclose(out);
+ if (ret && create) {
+ int unlink_ret;
- return ret;
+ unlink_ret = unlink(target);
+ if (unlink_ret)
+ error("unlink output file %s failed: %s",
+ target, strerror(errno));
+ }
+ }
+
+ btrfs_close_all_devices();
+
+ return !!ret;
}
projects / platform / upstream / btrfs-progs.git / blobdiff