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btrfs: Remove fsid/metadata_fsid fields from btrfs_info 

Currently btrfs_fs_info structure contains a copy of the
fsid/metadata_uuid fields. Same values are also contained in the
btrfs_fs_devices structure which fs_info has a reference to. Let's
reduce duplication by removing the fields from fs_info and always refer
to the ones in fs_devices. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-10-30 16:43:24 +02:00 committed by David Sterba
parent 56f20f4009
commit de37aa5131
9 changed files with 23 additions and 26 deletions
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2
fs/btrfs/check-integrity.c
View File

@ -1720,7 +1720,7 @@ static int btrfsic_test_for_metadata(struct btrfsic_state *state,
num_pages = state->metablock_size >> PAGE_SHIFT;
h = (struct btrfs_header *)datav[0];
if (memcmp(h->fsid, fs_info->fsid, BTRFS_FSID_SIZE))
if (memcmp(h->fsid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE))
return 1;
for (i = 0; i < num_pages; i++) {

5
fs/btrfs/ctree.c
View File

@ -12,6 +12,7 @@
#include "transaction.h"
#include "print-tree.h"
#include "locking.h"
#include "volumes.h"
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level);
@ -224,7 +225,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, new_root_objectid);
write_extent_buffer_fsid(cow, fs_info->metadata_fsid);
write_extent_buffer_fsid(cow, fs_info->fs_devices->metadata_uuid);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
@ -1050,7 +1051,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
else
btrfs_set_header_owner(cow, root->root_key.objectid);
write_extent_buffer_fsid(cow, fs_info->metadata_fsid);
write_extent_buffer_fsid(cow, fs_info->fs_devices->metadata_uuid);
ret = update_ref_for_cow(trans, root, buf, cow, &last_ref);
if (ret) {

4
fs/btrfs/ctree.h
View File

@ -773,10 +773,6 @@ bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
#define BTRFS_FS_BALANCE_RUNNING 18
struct btrfs_fs_info {
/* User-visible fs UUID */
u8 fsid[BTRFS_FSID_SIZE];
/* UUID written to btree blocks */
u8 metadata_fsid[BTRFS_FSID_SIZE];
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
unsigned long flags;
struct btrfs_root *extent_root;

20
fs/btrfs/disk-io.c
View File

@ -542,7 +542,7 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
if (WARN_ON(!PageUptodate(page)))
return -EUCLEAN;
ASSERT(memcmp_extent_buffer(eb, fs_info->metadata_fsid,
ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
return csum_tree_block(fs_info, eb, 0);
@ -2456,11 +2456,11 @@ static int validate_super(struct btrfs_fs_info *fs_info,
ret = -EINVAL;
}
if (memcmp(fs_info->metadata_fsid, sb->dev_item.fsid,
if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
BTRFS_FSID_SIZE) != 0) {
btrfs_err(fs_info,
"dev_item UUID does not match metadata fsid: %pU != %pU",
fs_info->metadata_fsid, sb->dev_item.fsid);
fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
ret = -EINVAL;
}
@ -2803,14 +2803,16 @@ int open_ctree(struct super_block *sb,
sizeof(*fs_info->super_for_commit));
brelse(bh);
memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
ASSERT(!memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
BTRFS_FSID_SIZE));
if (btrfs_fs_incompat(fs_info, METADATA_UUID)) {
memcpy(fs_info->metadata_fsid,
fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE);
} else {
memcpy(fs_info->metadata_fsid, fs_info->fsid, BTRFS_FSID_SIZE);
ASSERT(!memcmp(fs_info->fs_devices->metadata_uuid,
fs_info->super_copy->metadata_uuid,
BTRFS_FSID_SIZE));
}
ret = btrfs_validate_mount_super(fs_info);
if (ret) {
btrfs_err(fs_info, "superblock contains fatal errors");
@ -2930,7 +2932,7 @@ int open_ctree(struct super_block *sb,
sb->s_blocksize = sectorsize;
sb->s_blocksize_bits = blksize_bits(sectorsize);
memcpy(&sb->s_uuid, fs_info->fsid, BTRFS_FSID_SIZE);
memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_sys_array(fs_info);

2
fs/btrfs/extent-tree.c
View File

@ -8312,7 +8312,7 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
btrfs_set_header_generation(buf, trans->transid);
btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(buf, owner);
write_extent_buffer_fsid(buf, fs_info->metadata_fsid);
write_extent_buffer_fsid(buf, fs_info->fs_devices->metadata_uuid);
write_extent_buffer_chunk_tree_uuid(buf, fs_info->chunk_tree_uuid);
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
buf->log_index = root->log_transid % 2;

2
fs/btrfs/ioctl.c
View File

@ -3150,7 +3150,7 @@ static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
}
rcu_read_unlock();
memcpy(&fi_args->fsid, fs_info->fsid, sizeof(fi_args->fsid));
memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
fi_args->nodesize = fs_info->nodesize;
fi_args->sectorsize = fs_info->sectorsize;
fi_args->clone_alignment = fs_info->sectorsize;

2
fs/btrfs/super.c
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@ -2090,7 +2090,7 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
u64 total_free_data = 0;
u64 total_free_meta = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)fs_info->fsid;
__be32 *fsid = (__be32 *)fs_info->fs_devices->fsid;
unsigned factor = 1;
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
int ret;

10
fs/btrfs/volumes.c
View File

@ -1780,8 +1780,8 @@ static int btrfs_add_dev_item(struct btrfs_trans_handle *trans,
ptr = btrfs_device_uuid(dev_item);
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
ptr = btrfs_device_fsid(dev_item);
write_extent_buffer(leaf, trans->fs_info->metadata_fsid, ptr,
BTRFS_FSID_SIZE);
write_extent_buffer(leaf, trans->fs_info->fs_devices->metadata_uuid,
ptr, BTRFS_FSID_SIZE);
btrfs_mark_buffer_dirty(leaf);
ret = 0;
@ -2324,9 +2324,7 @@ static int btrfs_prepare_sprout(struct btrfs_fs_info *fs_info)
fs_devices->seed = seed_devices;
generate_random_uuid(fs_devices->fsid);
memcpy(fs_info->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
memcpy(fs_devices->metadata_uuid, fs_devices->fsid, BTRFS_FSID_SIZE);
memcpy(fs_info->metadata_fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
memcpy(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
mutex_unlock(&fs_devices->device_list_mutex);
@ -2568,7 +2566,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
* so rename the fsid on the sysfs
*/
snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU",
fs_info->fsid);
fs_info->fs_devices->fsid);
if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
btrfs_warn(fs_info,
"sysfs: failed to create fsid for sprout");
@ -6722,7 +6720,7 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
BTRFS_FSID_SIZE);
if (memcmp(fs_uuid, fs_info->metadata_fsid, BTRFS_FSID_SIZE)) {
if (memcmp(fs_uuid, fs_devices->metadata_uuid, BTRFS_FSID_SIZE)) {
fs_devices = open_seed_devices(fs_info, fs_uuid);
if (IS_ERR(fs_devices))
return PTR_ERR(fs_devices);

2
include/trace/events/btrfs.h
View File

@ -92,7 +92,7 @@ TRACE_DEFINE_ENUM(COMMIT_TRANS);
#define TP_STRUCT__entry_fsid __array(u8, fsid, BTRFS_FSID_SIZE)
#define TP_fast_assign_fsid(fs_info) \
memcpy(__entry->fsid, fs_info->fsid, BTRFS_FSID_SIZE)
memcpy(__entry->fsid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE)
#define TP_STRUCT__entry_btrfs(args...) \
TP_STRUCT__entry( \