#include "crc32c.h"
#include "utils.h"
#include "print-tree.h"
-
-static int close_all_devices(struct btrfs_fs_info *fs_info);
+#include "rbtree-utils.h"
static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
{
fs_devices = root->fs_info->fs_devices;
while (fs_devices) {
if (!memcmp_extent_buffer(buf, fs_devices->fsid,
- (unsigned long)btrfs_header_fsid(buf),
+ btrfs_header_fsid(),
BTRFS_FSID_SIZE)) {
ret = 0;
break;
*(__le32 *)result = ~cpu_to_le32(crc);
}
-int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
- int verify)
+static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
+ int verify, int silent)
{
char *result;
u32 len;
if (verify) {
if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
- printk("checksum verify failed on %llu wanted %X "
- "found %X\n", (unsigned long long)buf->start,
- *((int *)result), *((char *)buf->data));
+ if (!silent)
+ printk("checksum verify failed on %llu found %08X wanted %08X\n",
+ (unsigned long long)buf->start,
+ *((u32 *)result),
+ *((u32*)(char *)buf->data));
free(result);
return 1;
}
return 0;
}
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
+{
+ return __csum_tree_block_size(buf, csum_size, verify, 0);
+}
+
+int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
+{
+ return __csum_tree_block_size(buf, csum_size, 1, 1);
+}
+
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
- int verify)
+ int verify)
{
u16 csum_size =
- btrfs_super_csum_size(&root->fs_info->super_copy);
+ btrfs_super_csum_size(root->fs_info->super_copy);
return csum_tree_block_size(buf, csum_size, verify);
}
blocksize);
}
-int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
- u64 parent_transid)
+void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
+ u64 parent_transid)
{
- int ret;
struct extent_buffer *eb;
u64 length;
struct btrfs_multi_bio *multi = NULL;
struct btrfs_device *device;
eb = btrfs_find_tree_block(root, bytenr, blocksize);
- if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
- free_extent_buffer(eb);
- return 0;
+ if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
+ !btrfs_map_block(&root->fs_info->mapping_tree, READ,
+ bytenr, &length, &multi, 0, NULL)) {
+ device = multi->stripes[0].dev;
+ device->total_ios++;
+ blocksize = min(blocksize, (u32)(64 * 1024));
+ readahead(device->fd, multi->stripes[0].physical, blocksize);
}
- length = blocksize;
- ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
- bytenr, &length, &multi, 0);
- BUG_ON(ret);
- device = multi->stripes[0].dev;
- device->total_ios++;
- blocksize = min(blocksize, (u32)(64 * 1024));
- readahead(device->fd, multi->stripes[0].physical, blocksize);
+ free_extent_buffer(eb);
kfree(multi);
- return 0;
}
static int verify_parent_transid(struct extent_io_tree *io_tree,
(unsigned long long)parent_transid,
(unsigned long long)btrfs_header_generation(eb));
if (ignore) {
+ eb->flags |= EXTENT_BAD_TRANSID;
printk("Ignoring transid failure\n");
return 0;
}
}
+int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
+{
+ unsigned long offset = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ struct btrfs_device *device;
+ int ret = 0;
+ u64 read_len;
+ unsigned long bytes_left = eb->len;
+
+ while (bytes_left) {
+ read_len = bytes_left;
+ device = NULL;
+
+ if (!info->on_restoring &&
+ eb->start != BTRFS_SUPER_INFO_OFFSET) {
+ ret = btrfs_map_block(&info->mapping_tree, READ,
+ eb->start + offset, &read_len, &multi,
+ mirror, NULL);
+ if (ret) {
+ printk("Couldn't map the block %Lu\n", eb->start + offset);
+ kfree(multi);
+ return -EIO;
+ }
+ device = multi->stripes[0].dev;
+
+ if (device->fd == 0) {
+ kfree(multi);
+ return -EIO;
+ }
+
+ eb->fd = device->fd;
+ device->total_ios++;
+ eb->dev_bytenr = multi->stripes[0].physical;
+ kfree(multi);
+ multi = NULL;
+ } else {
+ /* special case for restore metadump */
+ list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
+ if (device->devid == 1)
+ break;
+ }
+
+ eb->fd = device->fd;
+ eb->dev_bytenr = eb->start;
+ device->total_ios++;
+ }
+
+ if (read_len > bytes_left)
+ read_len = bytes_left;
+
+ ret = read_extent_from_disk(eb, offset, read_len);
+ if (ret)
+ return -EIO;
+ offset += read_len;
+ bytes_left -= read_len;
+ }
+ return 0;
+}
+
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize, u64 parent_transid)
{
int ret;
struct extent_buffer *eb;
- u64 length;
u64 best_transid = 0;
- struct btrfs_multi_bio *multi = NULL;
- struct btrfs_device *device;
int mirror_num = 0;
int good_mirror = 0;
int num_copies;
if (btrfs_buffer_uptodate(eb, parent_transid))
return eb;
- length = blocksize;
while (1) {
- ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
- eb->start, &length, &multi, mirror_num);
- if (ret) {
- printk("Couldn't map the block %Lu\n", bytenr);
- break;
- }
- device = multi->stripes[0].dev;
- eb->fd = device->fd;
- device->total_ios++;
- eb->dev_bytenr = multi->stripes[0].physical;
- kfree(multi);
- ret = read_extent_from_disk(eb);
-
+ ret = read_whole_eb(root->fs_info, eb, mirror_num);
if (ret == 0 && check_tree_block(root, eb) == 0 &&
csum_tree_block(root, eb, 1) == 0 &&
verify_parent_transid(eb->tree, eb, parent_transid, ignore)
== 0) {
+ if (eb->flags & EXTENT_BAD_TRANSID &&
+ list_empty(&eb->recow)) {
+ list_add_tail(&eb->recow,
+ &root->fs_info->recow_ebs);
+ eb->refs++;
+ }
btrfs_set_buffer_uptodate(eb);
return eb;
}
ignore = 1;
continue;
}
- if (btrfs_header_generation(eb) > best_transid) {
+ if (btrfs_header_generation(eb) > best_transid && mirror_num) {
best_transid = btrfs_header_generation(eb);
good_mirror = mirror_num;
}
return NULL;
}
-int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+int write_and_map_eb(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
struct extent_buffer *eb)
{
int ret;
int dev_nr;
u64 length;
+ u64 *raid_map = NULL;
struct btrfs_multi_bio *multi = NULL;
- if (check_tree_block(root, eb))
- BUG();
- if (!btrfs_buffer_uptodate(eb, trans->transid))
- BUG();
-
- btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
- csum_tree_block(root, eb, 0);
-
dev_nr = 0;
length = eb->len;
ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
- eb->start, &length, &multi, 0);
+ eb->start, &length, &multi, 0, &raid_map);
- while(dev_nr < multi->num_stripes) {
+ if (raid_map) {
+ ret = write_raid56_with_parity(root->fs_info, eb, multi,
+ length, raid_map);
+ BUG_ON(ret);
+ } else while (dev_nr < multi->num_stripes) {
BUG_ON(ret);
eb->fd = multi->stripes[dev_nr].dev->fd;
eb->dev_bytenr = multi->stripes[dev_nr].physical;
return 0;
}
-static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
+static int write_tree_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *eb)
+{
+ if (check_tree_block(root, eb))
+ BUG();
+
+ if (!btrfs_buffer_uptodate(eb, trans->transid))
+ BUG();
+
+ btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
+ csum_tree_block(root, eb, 0);
+
+ return write_and_map_eb(trans, root, eb);
+}
+
+int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
u32 stripesize, struct btrfs_root *root,
struct btrfs_fs_info *fs_info, u64 objectid)
{
list_del_init(next);
root = list_entry(next, struct btrfs_root, dirty_list);
update_cowonly_root(trans, root);
+ free_extent_buffer(root->commit_root);
+ root->commit_root = NULL;
}
+
return 0;
}
if (root->commit_root == root->node)
goto commit_tree;
+ if (root == root->fs_info->tree_root)
+ goto commit_tree;
free_extent_buffer(root->commit_root);
root->commit_root = NULL;
root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
&root->root_item, &root->root_key);
- BUG_ON(ret);
+ if (ret)
+ return ret;
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
generation = btrfs_root_generation(&root->root_item);
fs_info->log_root_tree = log_root;
if (!extent_buffer_uptodate(log_root->node)) {
+ free_extent_buffer(log_root->node);
free(log_root);
+ fs_info->log_root_tree = NULL;
return -EIO;
}
- free(log_root);
return 0;
}
-
-int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_root *root)
+int btrfs_free_fs_root(struct btrfs_root *root)
{
if (root->node)
free_extent_buffer(root->node);
return 0;
}
-static int free_fs_roots(struct btrfs_fs_info *fs_info)
+static void __free_fs_root(struct rb_node *node)
{
- struct cache_extent *cache;
struct btrfs_root *root;
- while (1) {
- cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
- if (!cache)
- break;
- root = container_of(cache, struct btrfs_root, cache);
- remove_cache_extent(&fs_info->fs_root_cache, cache);
- btrfs_free_fs_root(fs_info, root);
- }
- return 0;
+ root = container_of(node, struct btrfs_root, rb_node);
+ btrfs_free_fs_root(root);
}
+FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
+
struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
struct btrfs_key *location)
{
memcpy(&root->root_key, location, sizeof(*location));
ret = 0;
out:
- btrfs_release_path(root, path);
btrfs_free_path(path);
if (ret) {
free(root);
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize, generation);
- BUG_ON(!root->node);
+ if (!root->node) {
+ free(root);
+ return ERR_PTR(-EIO);
+ }
insert:
root->ref_cows = 1;
return root;
}
+static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
+ void *data)
+{
+ u64 objectid = *((u64 *)data);
+ struct btrfs_root *root;
+
+ root = rb_entry(node, struct btrfs_root, rb_node);
+ if (objectid > root->objectid)
+ return 1;
+ else if (objectid < root->objectid)
+ return -1;
+ else
+ return 0;
+}
+
+static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
+ struct rb_node *node2)
+{
+ struct btrfs_root *root;
+
+ root = rb_entry(node2, struct btrfs_root, rb_node);
+ return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
+}
+
struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
struct btrfs_key *location)
{
struct btrfs_root *root;
- struct cache_extent *cache;
+ struct rb_node *node;
int ret;
+ u64 objectid = location->objectid;
if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
return fs_info->tree_root;
return fs_info->dev_root;
if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
return fs_info->csum_root;
+ if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
+ return fs_info->csum_root;
BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
location->offset != (u64)-1);
- cache = find_cache_extent(&fs_info->fs_root_cache,
- location->objectid, 1);
- if (cache)
- return container_of(cache, struct btrfs_root, cache);
+ node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
+ btrfs_fs_roots_compare_objectids, NULL);
+ if (node)
+ return container_of(node, struct btrfs_root, rb_node);
root = btrfs_read_fs_root_no_cache(fs_info, location);
if (IS_ERR(root))
return root;
- root->cache.start = location->objectid;
- root->cache.size = 1;
- ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
- &root->cache);
+ ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
+ btrfs_fs_roots_compare_roots);
BUG_ON(ret);
return root;
}
-static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
- u64 sb_bytenr,
- u64 root_tree_bytenr, int writes,
- int partial)
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
{
- u32 sectorsize;
- u32 nodesize;
- u32 leafsize;
- u32 blocksize;
- u32 stripesize;
- u64 generation;
- struct btrfs_key key;
- struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
- struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
- struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
- struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
- struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
- struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
- int ret;
- struct btrfs_super_block *disk_super;
- struct btrfs_fs_devices *fs_devices = NULL;
- u64 total_devs;
- u64 features;
-
- if (sb_bytenr == 0)
- sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
-
- ret = btrfs_scan_one_device(fp, path, &fs_devices,
- &total_devs, sb_bytenr);
-
- if (ret) {
- fprintf(stderr, "No valid Btrfs found on %s\n", path);
- goto out;
- }
+ free(fs_info->tree_root);
+ free(fs_info->extent_root);
+ free(fs_info->chunk_root);
+ free(fs_info->dev_root);
+ free(fs_info->csum_root);
+ free(fs_info->quota_root);
+ free(fs_info->super_copy);
+ free(fs_info->log_root_tree);
+ free(fs_info);
+}
- if (total_devs != 1) {
- ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
- if (ret)
- goto out;
- }
+struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
+{
+ struct btrfs_fs_info *fs_info;
- memset(fs_info, 0, sizeof(*fs_info));
- fs_info->tree_root = tree_root;
- fs_info->extent_root = extent_root;
- fs_info->chunk_root = chunk_root;
- fs_info->dev_root = dev_root;
- fs_info->csum_root = csum_root;
+ fs_info = malloc(sizeof(struct btrfs_fs_info));
+ if (!fs_info)
+ return NULL;
- if (!writes)
- fs_info->readonly = 1;
+ memset(fs_info, 0, sizeof(struct btrfs_fs_info));
+
+ fs_info->tree_root = malloc(sizeof(struct btrfs_root));
+ fs_info->extent_root = malloc(sizeof(struct btrfs_root));
+ fs_info->chunk_root = malloc(sizeof(struct btrfs_root));
+ fs_info->dev_root = malloc(sizeof(struct btrfs_root));
+ fs_info->csum_root = malloc(sizeof(struct btrfs_root));
+ fs_info->quota_root = malloc(sizeof(struct btrfs_root));
+ fs_info->super_copy = malloc(BTRFS_SUPER_INFO_SIZE);
+
+ if (!fs_info->tree_root || !fs_info->extent_root ||
+ !fs_info->chunk_root || !fs_info->dev_root ||
+ !fs_info->csum_root || !fs_info->quota_root ||
+ !fs_info->super_copy)
+ goto free_all;
+
+ memset(fs_info->super_copy, 0, BTRFS_SUPER_INFO_SIZE);
+ memset(fs_info->tree_root, 0, sizeof(struct btrfs_root));
+ memset(fs_info->extent_root, 0, sizeof(struct btrfs_root));
+ memset(fs_info->chunk_root, 0, sizeof(struct btrfs_root));
+ memset(fs_info->dev_root, 0, sizeof(struct btrfs_root));
+ memset(fs_info->csum_root, 0, sizeof(struct btrfs_root));
+ memset(fs_info->quota_root, 0, sizeof(struct btrfs_root));
extent_io_tree_init(&fs_info->extent_cache);
extent_io_tree_init(&fs_info->free_space_cache);
extent_io_tree_init(&fs_info->pinned_extents);
extent_io_tree_init(&fs_info->pending_del);
extent_io_tree_init(&fs_info->extent_ins);
- cache_tree_init(&fs_info->fs_root_cache);
-
+ fs_info->fs_root_tree = RB_ROOT;
cache_tree_init(&fs_info->mapping_tree.cache_tree);
mutex_init(&fs_info->fs_mutex);
- fs_info->fs_devices = fs_devices;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
INIT_LIST_HEAD(&fs_info->space_info);
+ INIT_LIST_HEAD(&fs_info->recow_ebs);
- __setup_root(4096, 4096, 4096, 4096, tree_root,
- fs_info, BTRFS_ROOT_TREE_OBJECTID);
-
- if (writes)
- ret = btrfs_open_devices(fs_devices, O_RDWR);
- else
- ret = btrfs_open_devices(fs_devices, O_RDONLY);
- if (ret)
- goto out_cleanup;
+ if (!writable)
+ fs_info->readonly = 1;
fs_info->super_bytenr = sb_bytenr;
- disk_super = &fs_info->super_copy;
- ret = btrfs_read_dev_super(fs_devices->latest_bdev,
- disk_super, sb_bytenr);
- if (ret) {
- printk("No valid btrfs found\n");
- goto out_devices;
- }
-
- memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
+ fs_info->data_alloc_profile = (u64)-1;
+ fs_info->metadata_alloc_profile = (u64)-1;
+ fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
+ return fs_info;
+free_all:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
+}
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
+{
+ u64 features;
- features = btrfs_super_incompat_flags(disk_super) &
+ features = btrfs_super_incompat_flags(sb) &
~BTRFS_FEATURE_INCOMPAT_SUPP;
if (features) {
printk("couldn't open because of unsupported "
"option features (%Lx).\n",
(unsigned long long)features);
- goto out_devices;
+ return -ENOTSUP;
}
- features = btrfs_super_incompat_flags(disk_super);
+ features = btrfs_super_incompat_flags(sb);
if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
- btrfs_set_super_incompat_flags(disk_super, features);
+ btrfs_set_super_incompat_flags(sb, features);
}
- features = btrfs_super_compat_ro_flags(disk_super) &
+ features = btrfs_super_compat_ro_flags(sb) &
~BTRFS_FEATURE_COMPAT_RO_SUPP;
- if (writes && features) {
+ if (writable && features) {
printk("couldn't open RDWR because of unsupported "
"option features (%Lx).\n",
(unsigned long long)features);
- goto out_devices;
+ return -ENOTSUP;
}
+ return 0;
+}
- nodesize = btrfs_super_nodesize(disk_super);
- leafsize = btrfs_super_leafsize(disk_super);
- sectorsize = btrfs_super_sectorsize(disk_super);
- stripesize = btrfs_super_stripesize(disk_super);
- tree_root->nodesize = nodesize;
- tree_root->leafsize = leafsize;
- tree_root->sectorsize = sectorsize;
- tree_root->stripesize = stripesize;
-
- ret = btrfs_read_sys_array(tree_root);
- if (ret)
- goto out_devices;
- blocksize = btrfs_level_size(tree_root,
- btrfs_super_chunk_root_level(disk_super));
- generation = btrfs_super_chunk_root_generation(disk_super);
-
- __setup_root(nodesize, leafsize, sectorsize, stripesize,
- chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
+static int find_best_backup_root(struct btrfs_super_block *super)
+{
+ struct btrfs_root_backup *backup;
+ u64 orig_gen = btrfs_super_generation(super);
+ u64 gen = 0;
+ int best_index = 0;
+ int i;
- chunk_root->node = read_tree_block(chunk_root,
- btrfs_super_chunk_root(disk_super),
- blocksize, generation);
- if (!extent_buffer_uptodate(chunk_root->node)) {
- printk("Couldn't read chunk root\n");
- goto out_devices;
+ for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
+ backup = super->super_roots + i;
+ if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
+ btrfs_backup_tree_root_gen(backup) > gen) {
+ best_index = i;
+ gen = btrfs_backup_tree_root_gen(backup);
+ }
}
+ return best_index;
+}
- read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
- (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
- BTRFS_UUID_SIZE);
+int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
+ enum btrfs_open_ctree_flags flags)
+{
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ struct btrfs_root *root;
+ struct btrfs_key key;
+ u32 sectorsize;
+ u32 nodesize;
+ u32 leafsize;
+ u32 stripesize;
+ u64 generation;
+ u32 blocksize;
+ int ret;
- if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
- ret = btrfs_read_chunk_tree(chunk_root);
- if (ret)
- goto out_failed;
+ nodesize = btrfs_super_nodesize(sb);
+ leafsize = btrfs_super_leafsize(sb);
+ sectorsize = btrfs_super_sectorsize(sb);
+ stripesize = btrfs_super_stripesize(sb);
+
+ root = fs_info->tree_root;
+ __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ blocksize = btrfs_level_size(root, btrfs_super_root_level(sb));
+ generation = btrfs_super_generation(sb);
+
+ if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
+ root_tree_bytenr = btrfs_super_root(sb);
+ } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
+ struct btrfs_root_backup *backup;
+ int index = find_best_backup_root(sb);
+ if (index >= BTRFS_NUM_BACKUP_ROOTS) {
+ fprintf(stderr, "Invalid backup root number\n");
+ return -EIO;
+ }
+ backup = fs_info->super_copy->super_roots + index;
+ root_tree_bytenr = btrfs_backup_tree_root(backup);
+ generation = btrfs_backup_tree_root_gen(backup);
}
- blocksize = btrfs_level_size(tree_root,
- btrfs_super_root_level(disk_super));
- generation = btrfs_super_generation(disk_super);
-
- if (!root_tree_bytenr)
- root_tree_bytenr = btrfs_super_root(disk_super);
- tree_root->node = read_tree_block(tree_root,
- root_tree_bytenr,
- blocksize, generation);
- if (!extent_buffer_uptodate(tree_root->node)) {
- printk("Couldn't read tree root\n");
- goto out_failed;
+ root->node = read_tree_block(root, root_tree_bytenr, blocksize,
+ generation);
+ if (!extent_buffer_uptodate(root->node)) {
+ fprintf(stderr, "Couldn't read tree root\n");
+ return -EIO;
}
- ret = find_and_setup_root(tree_root, fs_info,
- BTRFS_EXTENT_TREE_OBJECTID, extent_root);
+
+ ret = find_and_setup_root(root, fs_info, BTRFS_EXTENT_TREE_OBJECTID,
+ fs_info->extent_root);
if (ret) {
printk("Couldn't setup extent tree\n");
- goto out_failed;
+ if (!(flags & OPEN_CTREE_PARTIAL))
+ return -EIO;
+ /* Need a blank node here just so we don't screw up in the
+ * million of places that assume a root has a valid ->node
+ */
+ fs_info->extent_root->node =
+ btrfs_find_create_tree_block(fs_info->extent_root, 0,
+ leafsize);
+ if (!fs_info->extent_root->node)
+ return -ENOMEM;
+ clear_extent_buffer_uptodate(NULL, fs_info->extent_root->node);
}
- extent_root->track_dirty = 1;
+ fs_info->extent_root->track_dirty = 1;
- ret = find_and_setup_root(tree_root, fs_info,
- BTRFS_DEV_TREE_OBJECTID, dev_root);
+ ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
+ fs_info->dev_root);
if (ret) {
printk("Couldn't setup device tree\n");
- goto out_failed;
+ return -EIO;
}
- dev_root->track_dirty = 1;
+ fs_info->dev_root->track_dirty = 1;
- ret = find_and_setup_root(tree_root, fs_info,
- BTRFS_CSUM_TREE_OBJECTID, csum_root);
+ ret = find_and_setup_root(root, fs_info, BTRFS_CSUM_TREE_OBJECTID,
+ fs_info->csum_root);
if (ret) {
printk("Couldn't setup csum tree\n");
- if (!partial)
- goto out_failed;
+ if (!(flags & OPEN_CTREE_PARTIAL))
+ return -EIO;
+ /* do the same thing as extent tree rebuilding */
+ fs_info->csum_root->node =
+ btrfs_find_create_tree_block(fs_info->extent_root, 0,
+ leafsize);
+ if (!fs_info->csum_root->node)
+ return -ENOMEM;
+ clear_extent_buffer_uptodate(NULL, fs_info->csum_root->node);
}
- csum_root->track_dirty = 1;
+ fs_info->csum_root->track_dirty = 1;
- find_and_setup_log_root(tree_root, fs_info, disk_super);
+ ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
+ fs_info->quota_root);
+ if (ret == 0)
+ fs_info->quota_enabled = 1;
+
+ ret = find_and_setup_log_root(root, fs_info, sb);
+ if (ret) {
+ printk("Couldn't setup log root tree\n");
+ return -EIO;
+ }
fs_info->generation = generation;
fs_info->last_trans_committed = generation;
- btrfs_read_block_groups(fs_info->tree_root);
+ if (extent_buffer_uptodate(fs_info->extent_root->node) &&
+ !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
+ btrfs_read_block_groups(fs_info->tree_root);
key.objectid = BTRFS_FS_TREE_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
- if (!fs_info->fs_root)
- goto out_failed;
-
- fs_info->data_alloc_profile = (u64)-1;
- fs_info->metadata_alloc_profile = (u64)-1;
- fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
-
- return fs_info;
-
-out_failed:
- if (partial)
- return fs_info;
+ if (IS_ERR(fs_info->fs_root))
+ return -EIO;
+ return 0;
+}
+void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
+{
+ if (fs_info->quota_root)
+ free_extent_buffer(fs_info->quota_root->node);
if (fs_info->csum_root)
free_extent_buffer(fs_info->csum_root->node);
if (fs_info->dev_root)
free_extent_buffer(fs_info->extent_root->node);
if (fs_info->tree_root)
free_extent_buffer(fs_info->tree_root->node);
+ if (fs_info->log_root_tree)
+ free_extent_buffer(fs_info->log_root_tree->node);
if (fs_info->chunk_root)
free_extent_buffer(fs_info->chunk_root->node);
-out_devices:
- close_all_devices(fs_info);
-out_cleanup:
+}
+
+static void free_map_lookup(struct cache_extent *ce)
+{
+ struct map_lookup *map;
+
+ map = container_of(ce, struct map_lookup, ce);
+ kfree(map);
+}
+
+FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
+
+void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
+{
+ while (!list_empty(&fs_info->recow_ebs)) {
+ struct extent_buffer *eb;
+ eb = list_first_entry(&fs_info->recow_ebs,
+ struct extent_buffer, recow);
+ list_del_init(&eb->recow);
+ free_extent_buffer(eb);
+ }
+ free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
extent_io_tree_cleanup(&fs_info->extent_cache);
extent_io_tree_cleanup(&fs_info->free_space_cache);
extent_io_tree_cleanup(&fs_info->block_group_cache);
extent_io_tree_cleanup(&fs_info->pinned_extents);
extent_io_tree_cleanup(&fs_info->pending_del);
extent_io_tree_cleanup(&fs_info->extent_ins);
-out:
- free(tree_root);
- free(extent_root);
- free(chunk_root);
- free(dev_root);
- free(csum_root);
- free(fs_info);
- return NULL;
}
-struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
- u64 sb_bytenr, int writes,
- int partial)
+int btrfs_scan_fs_devices(int fd, const char *path,
+ struct btrfs_fs_devices **fs_devices,
+ u64 sb_bytenr, int super_recover)
{
- int fp;
- struct btrfs_fs_info *info;
- int flags = O_CREAT | O_RDWR;
+ u64 total_devs;
+ int ret;
+ if (!sb_bytenr)
+ sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
- if (!writes)
- flags = O_RDONLY;
+ ret = btrfs_scan_one_device(fd, path, fs_devices,
+ &total_devs, sb_bytenr, super_recover);
+ if (ret) {
+ fprintf(stderr, "No valid Btrfs found on %s\n", path);
+ return ret;
+ }
- fp = open(filename, flags, 0600);
- if (fp < 0) {
- fprintf (stderr, "Could not open %s\n", filename);
- return NULL;
+ if (total_devs != 1) {
+ ret = btrfs_scan_lblkid(!BTRFS_UPDATE_KERNEL);
+ if (ret)
+ return ret;
}
- info = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes, partial);
- close(fp);
- return info;
+ return 0;
}
-struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
+int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
{
- struct btrfs_fs_info *info;
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ u32 sectorsize;
+ u32 nodesize;
+ u32 leafsize;
+ u32 blocksize;
+ u32 stripesize;
+ u64 generation;
+ int ret;
- info = open_ctree_fs_info(filename, sb_bytenr, writes, 0);
- if (!info)
+ nodesize = btrfs_super_nodesize(sb);
+ leafsize = btrfs_super_leafsize(sb);
+ sectorsize = btrfs_super_sectorsize(sb);
+ stripesize = btrfs_super_stripesize(sb);
+
+ __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
+
+ ret = btrfs_read_sys_array(fs_info->chunk_root);
+ if (ret)
+ return ret;
+
+ blocksize = btrfs_level_size(fs_info->chunk_root,
+ btrfs_super_chunk_root_level(sb));
+ generation = btrfs_super_chunk_root_generation(sb);
+
+ fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
+ btrfs_super_chunk_root(sb),
+ blocksize, generation);
+ if (!fs_info->chunk_root->node ||
+ !extent_buffer_uptodate(fs_info->chunk_root->node)) {
+ fprintf(stderr, "Couldn't read chunk root\n");
+ return -EIO;
+ }
+
+ if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
+ ret = btrfs_read_chunk_tree(fs_info->chunk_root);
+ if (ret) {
+ fprintf(stderr, "Couldn't read chunk tree\n");
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
+ u64 sb_bytenr,
+ u64 root_tree_bytenr,
+ enum btrfs_open_ctree_flags flags)
+{
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_fs_devices *fs_devices = NULL;
+ struct extent_buffer *eb;
+ int ret;
+ int oflags;
+
+ if (sb_bytenr == 0)
+ sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
+
+ /* try to drop all the caches */
+ if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
+ fprintf(stderr, "Warning, could not drop caches\n");
+
+ fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
+ if (!fs_info) {
+ fprintf(stderr, "Failed to allocate memory for fs_info\n");
return NULL;
- return info->fs_root;
+ }
+ if (flags & OPEN_CTREE_RESTORE)
+ fs_info->on_restoring = 1;
+
+ ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr,
+ (flags & OPEN_CTREE_RECOVER_SUPER));
+ if (ret)
+ goto out;
+
+ fs_info->fs_devices = fs_devices;
+ if (flags & OPEN_CTREE_WRITES)
+ oflags = O_RDWR;
+ else
+ oflags = O_RDONLY;
+
+ if (flags & OPEN_CTREE_EXCLUSIVE)
+ oflags |= O_EXCL;
+
+ ret = btrfs_open_devices(fs_devices, oflags);
+ if (ret)
+ goto out;
+
+ disk_super = fs_info->super_copy;
+ if (!(flags & OPEN_CTREE_RECOVER_SUPER))
+ ret = btrfs_read_dev_super(fs_devices->latest_bdev,
+ disk_super, sb_bytenr, 1);
+ else
+ ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr, 0);
+ if (ret) {
+ printk("No valid btrfs found\n");
+ goto out_devices;
+ }
+
+ memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
+
+ ret = btrfs_check_fs_compatibility(fs_info->super_copy,
+ flags & OPEN_CTREE_WRITES);
+ if (ret)
+ goto out_devices;
+
+ ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
+ if (ret)
+ goto out_chunk;
+
+ eb = fs_info->chunk_root->node;
+ read_extent_buffer(eb, fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(eb),
+ BTRFS_UUID_SIZE);
+
+ ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
+ if (ret)
+ goto out_chunk;
+
+ return fs_info;
+
+out_chunk:
+ btrfs_release_all_roots(fs_info);
+ btrfs_cleanup_all_caches(fs_info);
+out_devices:
+ btrfs_close_devices(fs_devices);
+out:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
}
-struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
- u64 root_tree_bytenr)
+struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
+ u64 sb_bytenr, u64 root_tree_bytenr,
+ enum btrfs_open_ctree_flags flags)
{
int fp;
struct btrfs_fs_info *info;
+ int oflags = O_CREAT | O_RDWR;
+ if (!(flags & OPEN_CTREE_WRITES))
+ oflags = O_RDONLY;
- fp = open(filename, O_RDONLY);
+ fp = open(filename, oflags, 0600);
if (fp < 0) {
fprintf (stderr, "Could not open %s\n", filename);
return NULL;
}
- info = __open_ctree_fd(fp, filename, sb_bytenr,
- root_tree_bytenr, 0, 0);
+ info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
+ flags);
close(fp);
+ return info;
+}
+struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
+ enum btrfs_open_ctree_flags flags)
+{
+ struct btrfs_fs_info *info;
+
+ info = open_ctree_fs_info(filename, sb_bytenr, 0, flags);
if (!info)
return NULL;
return info->fs_root;
}
struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
- int writes)
+ enum btrfs_open_ctree_flags flags)
{
struct btrfs_fs_info *info;
- info = __open_ctree_fd(fp, path, sb_bytenr, 0, writes, 0);
+ info = __open_ctree_fd(fp, path, sb_bytenr, 0, flags);
if (!info)
return NULL;
return info->fs_root;
}
-int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
+int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
+ int super_recover)
{
u8 fsid[BTRFS_FSID_SIZE];
int fsid_is_initialized = 0;
struct btrfs_super_block buf;
int i;
int ret;
+ int max_super = super_recover ? BTRFS_SUPER_MIRROR_MAX : 1;
u64 transid = 0;
u64 bytenr;
return -1;
if (btrfs_super_bytenr(&buf) != sb_bytenr ||
- buf.magic != cpu_to_le64(BTRFS_MAGIC))
+ btrfs_super_magic(&buf) != BTRFS_MAGIC)
return -1;
memcpy(sb, &buf, sizeof(*sb));
return 0;
}
- for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ /*
+ * we would like to check all the supers, but that would make
+ * a btrfs mount succeed after a mkfs from a different FS.
+ * So, we need to add a special mount option to scan for
+ * later supers, using BTRFS_SUPER_MIRROR_MAX instead
+ */
+
+ for (i = 0; i < max_super; i++) {
bytenr = btrfs_sb_offset(i);
ret = pread64(fd, &buf, sizeof(buf), bytenr);
if (ret < sizeof(buf))
if (btrfs_super_bytenr(&buf) != bytenr )
continue;
/* if magic is NULL, the device was removed */
- if (buf.magic == 0 && i == 0)
+ if (btrfs_super_magic(&buf) == 0 && i == 0)
return -1;
- if (buf.magic != cpu_to_le64(BTRFS_MAGIC))
+ if (btrfs_super_magic(&buf) != BTRFS_MAGIC)
continue;
if (!fsid_is_initialized) {
return transid > 0 ? 0 : -1;
}
-int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
- struct btrfs_device *device)
+static int write_dev_supers(struct btrfs_root *root,
+ struct btrfs_super_block *sb,
+ struct btrfs_device *device)
{
u64 bytenr;
u32 crc;
int i, ret;
- void *buf;
-
- buf = calloc(1, BTRFS_SUPER_INFO_SIZE);
- BUG_ON(!buf);
if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, (char *)&sb->csum[0]);
- memcpy(buf, sb, sizeof(*sb));
- ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE,
- root->fs_info->super_bytenr);
+ /*
+ * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
+ * zero filled, we can use it directly
+ */
+ ret = pwrite64(device->fd, root->fs_info->super_copy,
+ BTRFS_SUPER_INFO_SIZE,
+ root->fs_info->super_bytenr);
BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
- goto out;
+ return 0;
}
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, (char *)&sb->csum[0]);
- memcpy(buf, sb, sizeof(*sb));
- ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
+ /*
+ * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
+ * zero filled, we can use it directly
+ */
+ ret = pwrite64(device->fd, root->fs_info->super_copy,
+ BTRFS_SUPER_INFO_SIZE, bytenr);
BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
}
-out:
- free(buf);
+
return 0;
}
int ret;
u64 flags;
- sb = &root->fs_info->super_copy;
+ sb = root->fs_info->super_copy;
dev_item = &sb->dev_item;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
if (root->fs_info->readonly)
return 0;
- btrfs_set_super_generation(&root->fs_info->super_copy,
+ btrfs_set_super_generation(root->fs_info->super_copy,
trans->transid);
- btrfs_set_super_root(&root->fs_info->super_copy,
+ btrfs_set_super_root(root->fs_info->super_copy,
tree_root->node->start);
- btrfs_set_super_root_level(&root->fs_info->super_copy,
+ btrfs_set_super_root_level(root->fs_info->super_copy,
btrfs_header_level(tree_root->node));
- btrfs_set_super_chunk_root(&root->fs_info->super_copy,
+ btrfs_set_super_chunk_root(root->fs_info->super_copy,
chunk_root->node->start);
- btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
+ btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
btrfs_header_level(chunk_root->node));
- btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
+ btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
btrfs_header_generation(chunk_root->node));
ret = write_all_supers(root);
return ret;
}
-static int close_all_devices(struct btrfs_fs_info *fs_info)
-{
- struct list_head *list;
- struct list_head *next;
- struct btrfs_device *device;
-
- return 0;
-
- list = &fs_info->fs_devices->devices;
- list_for_each(next, list) {
- device = list_entry(next, struct btrfs_device, dev_list);
- close(device->fd);
- }
- return 0;
-}
-
int close_ctree(struct btrfs_root *root)
{
int ret;
}
btrfs_free_block_groups(fs_info);
- free_fs_roots(fs_info);
-
- if (fs_info->extent_root->node)
- free_extent_buffer(fs_info->extent_root->node);
- if (fs_info->tree_root->node)
- free_extent_buffer(fs_info->tree_root->node);
- if (fs_info->chunk_root->node)
- free_extent_buffer(fs_info->chunk_root->node);
- if (fs_info->dev_root->node)
- free_extent_buffer(fs_info->dev_root->node);
- if (fs_info->csum_root->node)
- free_extent_buffer(fs_info->csum_root->node);
-
- if (fs_info->log_root_tree) {
- if (fs_info->log_root_tree->node)
- free_extent_buffer(fs_info->log_root_tree->node);
- free(fs_info->log_root_tree);
- }
-
- close_all_devices(fs_info);
- extent_io_tree_cleanup(&fs_info->extent_cache);
- extent_io_tree_cleanup(&fs_info->free_space_cache);
- extent_io_tree_cleanup(&fs_info->block_group_cache);
- extent_io_tree_cleanup(&fs_info->pinned_extents);
- extent_io_tree_cleanup(&fs_info->pending_del);
- extent_io_tree_cleanup(&fs_info->extent_ins);
-
- free(fs_info->tree_root);
- free(fs_info->extent_root);
- free(fs_info->chunk_root);
- free(fs_info->dev_root);
- free(fs_info->csum_root);
- free(fs_info);
+ free_fs_roots_tree(&fs_info->fs_root_tree);
+ btrfs_release_all_roots(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
+ btrfs_cleanup_all_caches(fs_info);
+ btrfs_free_fs_info(fs_info);
return 0;
}
projects / platform / upstream / btrfs-progs.git / blobdiff