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Btrfs: add a device id to device items

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-04-12 12:14:00 -04:00 committed by David Woodhouse
parent 8352d8a473
commit b4100d6424
4 changed files with 65 additions and 12 deletions
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36
fs/btrfs/ctree.h
View file

@ -91,10 +91,12 @@ struct btrfs_super_block {
__le64 total_blocks;
__le64 blocks_used;
__le64 root_dir_objectid;
__le64 last_device_id;
/* fields below here vary with the underlying disk */
__le64 device_block_start;
__le64 device_num_blocks;
__le64 device_root;
__le64 device_id;
} __attribute__ ((__packed__));
/*
@ -230,6 +232,7 @@ struct btrfs_csum_item {
struct btrfs_device_item {
__le16 pathlen;
__le64 device_id;
} __attribute__ ((__packed__));
struct crypto_hash;
@ -798,6 +801,28 @@ static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
s->root_dir_objectid = cpu_to_le64(val);
}
static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
{
return le64_to_cpu(s->last_device_id);
}
static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
u64 val)
{
s->last_device_id = cpu_to_le64(val);
}
static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
{
return le64_to_cpu(s->device_id);
}
static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
u64 val)
{
s->device_id = cpu_to_le64(val);
}
static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
{
return le64_to_cpu(s->device_block_start);
@ -910,6 +935,17 @@ static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
d->pathlen = cpu_to_le16(val);
}
static inline u64 btrfs_device_id(struct btrfs_device_item *d)
{
return le64_to_cpu(d->device_id);
}
static inline void btrfs_set_device_id(struct btrfs_device_item *d,
u64 val)
{
d->device_id = cpu_to_le64(val);
}
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
{
return sb->s_fs_info;

31
fs/btrfs/disk-io.c
View file

@ -13,11 +13,13 @@
struct dev_lookup {
u64 block_start;
u64 num_blocks;
u64 device_id;
struct block_device *bdev;
};
int btrfs_insert_dev_radix(struct btrfs_root *root,
struct block_device *bdev,
u64 device_id,
u64 block_start,
u64 num_blocks)
{
@ -31,6 +33,7 @@ int btrfs_insert_dev_radix(struct btrfs_root *root,
lookup->block_start = block_start;
lookup->num_blocks = num_blocks;
lookup->bdev = bdev;
lookup->device_id = device_id;
printk("inserting %s into dev radix %Lu %Lu\n", bdevname(bdev, b), block_start, num_blocks);
ret = radix_tree_insert(&root->fs_info->dev_radix, block_start +
@ -418,17 +421,14 @@ printk("all worked\n");
return root;
}
int btrfs_open_disk(struct btrfs_root *root, u64 block_start, u64 num_blocks,
char *filename, int name_len)
static int btrfs_open_disk(struct btrfs_root *root, u64 device_id,
u64 block_start, u64 num_blocks,
char *filename, int name_len)
{
char *null_filename;
struct block_device *bdev;
int ret;
if (block_start == 0) {
printk("skipping disk with block_start == 0\n");
return 0;
}
null_filename = kmalloc(name_len + 1, GFP_NOFS);
if (!null_filename)
return -ENOMEM;
@ -441,7 +441,8 @@ return 0;
goto out;
}
set_blocksize(bdev, root->fs_info->sb->s_blocksize);
ret = btrfs_insert_dev_radix(root, bdev, block_start, num_blocks);
ret = btrfs_insert_dev_radix(root, bdev, device_id,
block_start, num_blocks);
BUG_ON(ret);
ret = 0;
out:
@ -490,10 +491,14 @@ static int read_device_info(struct btrfs_root *root)
}
dev_item = btrfs_item_ptr(leaf, slot, struct btrfs_device_item);
printk("found key %Lu %Lu\n", key.objectid, key.offset);
ret = btrfs_open_disk(root, key.objectid, key.offset,
(char *)(dev_item + 1),
btrfs_device_pathlen(dev_item));
BUG_ON(ret);
if (btrfs_device_id(dev_item) !=
btrfs_super_device_id(root->fs_info->disk_super)) {
ret = btrfs_open_disk(root, btrfs_device_id(dev_item),
key.objectid, key.offset,
(char *)(dev_item + 1),
btrfs_device_pathlen(dev_item));
BUG_ON(ret);
}
path->slots[0]++;
}
btrfs_free_path(path);
@ -556,6 +561,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
dev_lookup->block_start = 0;
dev_lookup->num_blocks = (u32)-2;
dev_lookup->bdev = sb->s_bdev;
dev_lookup->device_id = 0;
ret = radix_tree_insert(&fs_info->dev_radix, (u32)-2, dev_lookup);
BUG_ON(ret);
fs_info->sb_buffer = read_tree_block(tree_root,
@ -575,6 +581,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
radix_tree_delete(&fs_info->dev_radix, (u32)-2);
dev_lookup->block_start = btrfs_super_device_block_start(disk_super);
dev_lookup->num_blocks = btrfs_super_device_num_blocks(disk_super);
dev_lookup->device_id = btrfs_super_device_id(disk_super);
ret = radix_tree_insert(&fs_info->dev_radix,
dev_lookup->block_start +
dev_lookup->num_blocks - 1, dev_lookup);
@ -659,6 +667,7 @@ int del_fs_roots(struct btrfs_fs_info *fs_info)
}
return 0;
}
static int free_dev_radix(struct btrfs_fs_info *fs_info)
{
struct dev_lookup *lookup[8];

1
fs/btrfs/disk-io.h
View file

@ -44,6 +44,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
u64 bh_blocknr(struct buffer_head *bh);
int btrfs_insert_dev_radix(struct btrfs_root *root,
struct block_device *bdev,
u64 device_id,
u64 block_start,
u64 num_blocks);
int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,

9
fs/btrfs/super.c
View file

@ -1840,7 +1840,9 @@ static int add_disk(struct btrfs_root *root, char *name, int namelen)
u16 item_size;
u64 num_blocks;
u64 new_blocks;
u64 device_id;
int ret;
printk("adding disk %s\n", name);
path = btrfs_alloc_path();
if (!path)
@ -1875,9 +1877,14 @@ printk("insert failed %d\n", ret);
path->slots[0], struct btrfs_device_item);
btrfs_set_device_pathlen(dev_item, namelen);
memcpy(dev_item + 1, name, namelen);
device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1;
btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id);
btrfs_set_device_id(dev_item, device_id);
mark_buffer_dirty(path->nodes[0]);
ret = btrfs_insert_dev_radix(root, bdev, num_blocks, new_blocks);
ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks,
new_blocks);
if (!ret) {
btrfs_set_super_total_blocks(root->fs_info->disk_super,