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Btrfs: Implement generation numbers in block pointers

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-12-11 09:25:06 -05:00
parent 17636e03f4
commit 74493f7a59
3 changed files with 115 additions and 8 deletions
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60
fs/btrfs/extent-tree.c
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@@ -17,6 +17,7 @@
*/
#include <linux/sched.h>
#include "hash.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
@@ -352,9 +353,63 @@ found:
return found_group;
}
static u64 hash_extent_ref(u64 root_objectid, u64 root_generation,
u64 owner, u64 owner_offset)
{
u32 high_crc = ~(u32)0;
u32 low_crc = ~(u32)0;
__le64 lenum;
lenum = cpu_to_le64(root_objectid);
high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(root_generation);
high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(owner);
low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(owner_offset);
low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
return ((u64)high_crc << 32) | (u64)low_crc;
}
int insert_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr,
u64 root_objectid, u64 root_generation,
u64 owner, u64 owner_offset)
{
u64 hash;
struct btrfs_key key;
struct btrfs_extent_ref ref;
struct extent_buffer *l;
struct btrfs_extent_item *item;
int ret;
btrfs_set_stack_ref_root(&ref, root_objectid);
btrfs_set_stack_ref_generation(&ref, root_generation);
btrfs_set_stack_ref_objectid(&ref, owner);
btrfs_set_stack_ref_offset(&ref, owner_offset);
ret = btrfs_name_hash(&ref, sizeof(ref), &hash);
key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
while (ret == -EEXIST) {
}
}
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes)
u64 bytenr, u64 num_bytes,
u64 root_objectid, u64 root_generation,
u64 owner, u64 owner_offset)
{
struct btrfs_path *path;
int ret;
@@ -386,9 +441,10 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
btrfs_free_path(path);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
btrfs_free_path(path);
return 0;
}