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btrfs-progs: Add support for metadata_uuid field 

Add support for a new metadata_uuid field. This is just a preparatory
commit which switches all users of the fsid field for metdata comparison
purposes to utilize the new field. This more or less mirrors the
kernel patch, additionally:

 * Update 'btrfs inspect-internal dump-super' to account for the new
 field. This involes introducing the 'metadata_uuid' line to the
 output and updating the logic for comparing the fs uuid to the
 dev_item uuid.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Nikolay Borisov 2018-10-11 18:03:59 +03:00 committed by David Sterba
parent 9996feb94d
commit c4aadd9af2
13 changed files with 148 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
btrfstune.c
View File

@ -248,6 +248,9 @@ static int change_fsid_prepare(struct btrfs_fs_info *fs_info)
if (ret < 0)
return ret;
/* Also need to change the metadatauuid of the fs info */
memcpy(fs_info->metadata_uuid, fs_info->new_fsid, BTRFS_FSID_SIZE);
/* also restore new chunk_tree_id into tree_root for restore */
write_extent_buffer(tree_root->node, fs_info->new_chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(tree_root->node),

2
check/main.c
View File

@ -8424,7 +8424,7 @@ static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(c, root->root_key.objectid);
write_extent_buffer(c, root->fs_info->fsid,
write_extent_buffer(c, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(c, root->fs_info->chunk_tree_uuid,

16
chunk-recover.c
View File

@ -759,7 +759,7 @@ static int scan_one_device(void *dev_scan_struct)
rc->nodesize)
break;
if (memcmp_extent_buffer(buf, rc->fs_devices->fsid,
if (memcmp_extent_buffer(buf, rc->fs_devices->metadata_uuid,
btrfs_header_fsid(),
BTRFS_FSID_SIZE)) {
bytenr += rc->sectorsize;
@ -1155,7 +1155,7 @@ static int __rebuild_chunk_root(struct btrfs_trans_handle *trans,
btrfs_set_header_level(cow, 0);
btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(cow, BTRFS_CHUNK_TREE_OBJECTID);
write_extent_buffer(cow, root->fs_info->fsid,
write_extent_buffer(cow, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(cow, root->fs_info->chunk_tree_uuid,
@ -1192,7 +1192,8 @@ static int __rebuild_device_items(struct btrfs_trans_handle *trans,
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
BTRFS_FSID_SIZE);
ret = btrfs_insert_item(trans, root, &key,
dev_item, sizeof(*dev_item));
@ -1432,6 +1433,7 @@ open_ctree_with_broken_chunk(struct recover_control *rc)
struct btrfs_fs_info *fs_info;
struct btrfs_super_block *disk_super;
struct extent_buffer *eb;
u64 features;
int ret;
fs_info = btrfs_new_fs_info(1, BTRFS_SUPER_INFO_OFFSET);
@ -1464,6 +1466,14 @@ open_ctree_with_broken_chunk(struct recover_control *rc)
if (ret)
goto out_devices;
features = btrfs_super_incompat_flags(disk_super);
if (features & BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
memcpy(fs_info->metadata_uuid, disk_super->metadata_uuid,
BTRFS_FSID_SIZE);
else
memcpy(fs_info->metadata_uuid, fs_info->fsid, BTRFS_FSID_SIZE);
btrfs_setup_root(fs_info->chunk_root, fs_info,
BTRFS_CHUNK_TREE_OBJECTID);

2
cmds-filesystem.c
View File

@ -173,6 +173,7 @@ static int match_search_item_kernel(u8 *fsid, char *mnt, char *label,
return 0;
}
/* Search for user visible uuid 'search' in registered filesystems */
static int uuid_search(struct btrfs_fs_devices *fs_devices, const char *search)
{
char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
@ -498,6 +499,7 @@ static int copy_fs_devices(struct btrfs_fs_devices *dst,
int ret = 0;
memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
memcpy(dst->metadata_uuid, src->metadata_uuid, BTRFS_FSID_SIZE);
INIT_LIST_HEAD(&dst->devices);
dst->seed = NULL;

22
cmds-inspect-dump-super.c
View File

@ -228,7 +228,8 @@ static struct readable_flag_entry incompat_flags_array[] = {
DEF_INCOMPAT_FLAG_ENTRY(EXTENDED_IREF),
DEF_INCOMPAT_FLAG_ENTRY(RAID56),
DEF_INCOMPAT_FLAG_ENTRY(SKINNY_METADATA),
DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES)
DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES),
DEF_INCOMPAT_FLAG_ENTRY(METADATA_UUID)
};
static const int incompat_flags_num = sizeof(incompat_flags_array) /
sizeof(struct readable_flag_entry);
@ -319,6 +320,10 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
u8 *p;
u32 csum_size;
u16 csum_type;
bool metadata_uuid_present = (btrfs_super_incompat_flags(sb) &
BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
int cmp_res = 0;
csum_type = btrfs_super_csum_type(sb);
csum_size = BTRFS_CSUM_SIZE;
@ -365,6 +370,12 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
uuid_unparse(sb->fsid, buf);
printf("fsid\t\t\t%s\n", buf);
if (metadata_uuid_present) {
uuid_unparse(sb->metadata_uuid, buf);
printf("metadata_uuid\t\t%s\n", buf);
} else {
printf("metadata_uuid\t\t%s\n", buf);
}
printf("label\t\t\t");
s = sb->label;
@ -424,9 +435,14 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
printf("dev_item.uuid\t\t%s\n", buf);
uuid_unparse(sb->dev_item.fsid, buf);
if (metadata_uuid_present) {
cmp_res = !memcmp(sb->dev_item.fsid, sb->metadata_uuid,
BTRFS_FSID_SIZE);
} else {
cmp_res = !memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE);
}
printf("dev_item.fsid\t\t%s %s\n", buf,
!memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE) ?
"[match]" : "[DON'T MATCH]");
cmp_res ? "[match]" : "[DON'T MATCH]");
printf("dev_item.type\t\t%llu\n", (unsigned long long)
btrfs_stack_device_type(&sb->dev_item));

2
convert/common.c
View File

@ -107,9 +107,11 @@ static int setup_temp_super(int fd, struct btrfs_mkfs_config *cfg,
ret = -EINVAL;
goto out;
}
uuid_copy(super->metadata_uuid, super->fsid);
} else {
uuid_generate(super->fsid);
uuid_unparse(super->fsid, cfg->fs_uuid);
uuid_copy(super->metadata_uuid, super->fsid);
}
uuid_generate(chunk_uuid);
uuid_unparse(chunk_uuid, cfg->chunk_uuid);

14
ctree.c
View File

@ -134,7 +134,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, new_root_objectid);
write_extent_buffer(cow, root->fs_info->fsid,
write_extent_buffer(cow, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
@ -308,7 +308,7 @@ int __btrfs_cow_block(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, root->root_key.objectid);
write_extent_buffer(cow, root->fs_info->fsid,
write_extent_buffer(cow, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
WARN_ON(!(buf->flags & EXTENT_BAD_TRANSID) &&
@ -1532,7 +1532,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans,
btrfs_node_key(lower, &lower_key, 0);
c = btrfs_alloc_free_block(trans, root, root->fs_info->nodesize,
root->root_key.objectid, &lower_key,
root->root_key.objectid, &lower_key,
level, root->node->start, 0);
if (IS_ERR(c))
@ -1548,7 +1548,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans,
root_add_used(root, root->fs_info->nodesize);
write_extent_buffer(c, root->fs_info->fsid,
write_extent_buffer(c, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
@ -1669,7 +1669,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_header_generation(split, trans->transid);
btrfs_set_header_backref_rev(split, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(split, root->root_key.objectid);
write_extent_buffer(split, root->fs_info->fsid,
write_extent_buffer(split, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(split, root->fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(split),
@ -2231,7 +2231,7 @@ again:
}
}
}
if (split == 0)
btrfs_cpu_key_to_disk(&disk_key, ins_key);
else
@ -2251,7 +2251,7 @@ again:
btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(right, root->root_key.objectid);
btrfs_set_header_level(right, 0);
write_extent_buffer(right, root->fs_info->fsid,
write_extent_buffer(right, root->fs_info->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(right, root->fs_info->chunk_tree_uuid,

8
ctree.h
View File

@ -454,8 +454,9 @@ struct btrfs_super_block {
__le64 cache_generation;
__le64 uuid_tree_generation;
u8 metadata_uuid[BTRFS_FSID_SIZE];
/* future expansion */
__le64 reserved[30];
__le64 reserved[28];
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
} __attribute__ ((__packed__));
@ -489,6 +490,7 @@ struct btrfs_super_block {
#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
#define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
@ -511,7 +513,8 @@ struct btrfs_super_block {
BTRFS_FEATURE_INCOMPAT_RAID56 | \
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
BTRFS_FEATURE_INCOMPAT_NO_HOLES)
BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
/*
* A leaf is full of items. offset and size tell us where to find
@ -1090,6 +1093,7 @@ struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
u8 fsid[BTRFS_FSID_SIZE];
u8 metadata_uuid[BTRFS_FSID_SIZE];
u8 *new_fsid;
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
u8 *new_chunk_tree_uuid;

60
disk-io.c
View File

@ -55,8 +55,9 @@ static int check_tree_block(struct btrfs_fs_info *fs_info,
struct extent_buffer *buf)
{
struct btrfs_fs_devices *fs_devices;
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
u32 nodesize = fs_info->nodesize;
bool fsid_match = false;
int ret = BTRFS_BAD_FSID;
if (buf->start != btrfs_header_bytenr(buf))
@ -72,12 +73,26 @@ static int check_tree_block(struct btrfs_fs_info *fs_info,
btrfs_header_level(buf) != 0)
return BTRFS_BAD_NRITEMS;
fs_devices = fs_info->fs_devices;
while (fs_devices) {
if (fs_info->ignore_fsid_mismatch ||
!memcmp_extent_buffer(buf, fs_devices->fsid,
btrfs_header_fsid(),
BTRFS_FSID_SIZE)) {
/*
* Checking the incompat flag is only valid for the current
* fs. For seed devices it's forbidden to have their uuid
* changed so reading ->fsid in this case is fine
*/
if (fs_devices == fs_info->fs_devices &&
btrfs_fs_incompat(fs_info, METADATA_UUID))
fsid_match = !memcmp_extent_buffer(buf,
fs_devices->metadata_uuid,
btrfs_header_fsid(),
BTRFS_FSID_SIZE);
else
fsid_match = !memcmp_extent_buffer(buf,
fs_devices->fsid,
btrfs_header_fsid(),
BTRFS_FSID_SIZE);
if (fs_info->ignore_fsid_mismatch || fsid_match) {
ret = 0;
break;
}
@ -103,7 +118,7 @@ static void print_tree_block_error(struct btrfs_fs_info *fs_info,
read_extent_buffer(eb, buf, btrfs_header_fsid(),
BTRFS_UUID_SIZE);
uuid_unparse(buf, found_uuid);
uuid_unparse(fs_info->fsid, fs_uuid);
uuid_unparse(fs_info->metadata_uuid, fs_uuid);
fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
fs_uuid, found_uuid);
break;
@ -1170,6 +1185,12 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
}
memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
if (btrfs_fs_incompat(fs_info, METADATA_UUID)) {
memcpy(fs_info->metadata_uuid, disk_super->metadata_uuid,
BTRFS_FSID_SIZE);
} else {
memcpy(fs_info->metadata_uuid, fs_info->fsid, BTRFS_FSID_SIZE);
}
fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
fs_info->nodesize = btrfs_super_nodesize(disk_super);
fs_info->stripesize = btrfs_super_stripesize(disk_super);
@ -1290,6 +1311,7 @@ static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
u32 crc;
u16 csum_type;
int csum_size;
u8 *metadata_uuid;
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
if (btrfs_super_magic(sb) == BTRFS_MAGIC_TEMPORARY) {
@ -1378,11 +1400,16 @@ static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
goto error_out;
}
if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
if (btrfs_super_incompat_flags(sb) & BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
metadata_uuid = sb->metadata_uuid;
else
metadata_uuid = sb->fsid;
if (memcmp(metadata_uuid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
char fsid[BTRFS_UUID_UNPARSED_SIZE];
char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
uuid_unparse(sb->fsid, fsid);
uuid_unparse(sb->metadata_uuid, fsid);
uuid_unparse(sb->dev_item.fsid, dev_fsid);
if (sbflags & SBREAD_IGNORE_FSID_MISMATCH) {
warning("ignored: dev_item fsid mismatch: %s != %s",
@ -1454,6 +1481,7 @@ int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
unsigned sbflags)
{
u8 fsid[BTRFS_FSID_SIZE];
u8 metadata_uuid[BTRFS_FSID_SIZE];
int fsid_is_initialized = 0;
char tmp[BTRFS_SUPER_INFO_SIZE];
struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
@ -1461,6 +1489,7 @@ int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
int ret;
int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
u64 transid = 0;
bool metadata_uuid_set = false;
u64 bytenr;
if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
@ -1505,9 +1534,18 @@ int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
continue;
if (!fsid_is_initialized) {
if (btrfs_super_incompat_flags(buf) &
BTRFS_FEATURE_INCOMPAT_METADATA_UUID) {
metadata_uuid_set = true;
memcpy(metadata_uuid, buf->metadata_uuid,
sizeof(metadata_uuid));
}
memcpy(fsid, buf->fsid, sizeof(fsid));
fsid_is_initialized = 1;
} else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
} else if (memcmp(fsid, buf->fsid, sizeof(fsid)) ||
(metadata_uuid_set && memcmp(metadata_uuid,
buf->metadata_uuid,
sizeof(metadata_uuid)))) {
/*
* the superblocks (the original one and
* its backups) contain data of different
@ -1608,7 +1646,7 @@ int write_all_supers(struct btrfs_fs_info *fs_info)
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
memcpy(dev_item->fsid, fs_info->metadata_uuid, BTRFS_FSID_SIZE);
flags = btrfs_super_flags(sb);
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);

3
free-space-tree.c
View File

@ -1453,7 +1453,8 @@ static struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(leaf, objectid);
root->node = leaf;
write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
write_extent_buffer(leaf, fs_info->metadata_uuid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(leaf),
BTRFS_UUID_SIZE);

25
image/main.c
View File

@ -1404,7 +1404,7 @@ static void *restore_worker(void *data)
list_del_init(&async->list);
if (mdres->compress_method == COMPRESS_ZLIB) {
size = compress_size;
size = compress_size;
pthread_mutex_unlock(&mdres->mutex);
ret = uncompress(buffer, (unsigned long *)&size,
async->buffer, async->bufsize);
@ -1596,9 +1596,12 @@ static int fill_mdres_info(struct mdrestore_struct *mdres,
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);
if (btrfs_super_incompat_flags(super) &
BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
memcpy(mdres->fsid, super->metadata_uuid, BTRFS_FSID_SIZE);
else
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;
@ -1725,7 +1728,7 @@ static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
BTRFS_FSID_SIZE)) {
error("filesystem UUID of eb %llu does not match",
error("filesystem metadata UUID of eb %llu does not match",
(unsigned long long)bytenr);
ret = -EIO;
goto out;
@ -2039,9 +2042,13 @@ static int build_chunk_tree(struct mdrestore_struct *mdres,
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);
if (btrfs_super_incompat_flags(super) &
BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
memcpy(mdres->fsid, super->metadata_uuid, BTRFS_FSID_SIZE);
else
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);
@ -2492,7 +2499,7 @@ static int update_disk_super_on_device(struct btrfs_fs_info *info,
key.offset = cur_devid;
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0);
ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0);
if (ret) {
error("search key failed: %d", ret);
ret = -EIO;

34
volumes.c
View File

@ -142,13 +142,19 @@ static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
return NULL;
}
static struct btrfs_fs_devices *find_fsid(u8 *fsid)
static struct btrfs_fs_devices *find_fsid(u8 *fsid, u8 *metadata_uuid)
{
struct btrfs_fs_devices *fs_devices;
list_for_each_entry(fs_devices, &fs_uuids, list) {
if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
if (metadata_uuid && (memcmp(fsid, fs_devices->fsid,
BTRFS_FSID_SIZE) == 0) &&
(memcmp(metadata_uuid, fs_devices->metadata_uuid,
BTRFS_FSID_SIZE) == 0)) {
return fs_devices;
} else if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0){
return fs_devices;
}
}
return NULL;
}
@ -160,8 +166,15 @@ static int device_list_add(const char *path,
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
u64 found_transid = btrfs_super_generation(disk_super);
bool metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
if (metadata_uuid)
fs_devices = find_fsid(disk_super->fsid,
disk_super->metadata_uuid);
else
fs_devices = find_fsid(disk_super->fsid, NULL);
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
if (!fs_devices)
@ -169,6 +182,13 @@ static int device_list_add(const char *path,
INIT_LIST_HEAD(&fs_devices->devices);
list_add(&fs_devices->list, &fs_uuids);
memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
if (metadata_uuid)
memcpy(fs_devices->metadata_uuid,
disk_super->metadata_uuid, BTRFS_FSID_SIZE);
else
memcpy(fs_devices->metadata_uuid, fs_devices->fsid,
BTRFS_FSID_SIZE);
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
fs_devices->lowest_devid = (u64)-1;
@ -721,7 +741,7 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
ptr = (unsigned long)btrfs_device_uuid(dev_item);
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
ptr = (unsigned long)btrfs_device_fsid(dev_item);
write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_UUID_SIZE);
write_extent_buffer(leaf, fs_info->metadata_uuid, ptr, BTRFS_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
@ -1698,7 +1718,7 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
cur_devices = fs_info->fs_devices;
while (cur_devices) {
if (!fsid ||
(!memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE) ||
(!memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE) ||
fs_info->ignore_fsid_mismatch)) {
device = find_device(cur_devices, devid, uuid);
if (device)
@ -1980,7 +2000,7 @@ static int open_seed_devices(struct btrfs_fs_info *fs_info, u8 *fsid)
fs_devices = fs_devices->seed;
}
fs_devices = find_fsid(fsid);
fs_devices = find_fsid(fsid, NULL);
if (!fs_devices) {
/* missing all seed devices */
fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
@ -2019,7 +2039,7 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
BTRFS_UUID_SIZE);
read_extent_buffer(leaf, fs_uuid,
(unsigned long)btrfs_device_fsid(dev_item),
BTRFS_UUID_SIZE);
BTRFS_FSID_SIZE);
if (memcmp(fs_uuid, fs_info->fsid, BTRFS_UUID_SIZE)) {
ret = open_seed_devices(fs_info, fs_uuid);

1
volumes.h
View File

@ -71,6 +71,7 @@ struct btrfs_device {
struct btrfs_fs_devices {
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
u8 metadata_uuid[BTRFS_FSID_SIZE]; /* FS specific uuid */
/* the device with this id has the most recent copy of the super */
u64 latest_devid;