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Btrfs: Update find free objectid function for orphan cleanup code 

Orphan items use BTRFS_ORPHAN_OBJECTID (-5UUL) as key objectid. This
affects the find free objectid functions, inode objectid can easily
overflow after orphan file cleanup.

---

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Zheng Yan 2008-09-05 16:43:53 -04:00 committed by Chris Mason
parent b214107eda
commit 6527cdbe68
2 changed files with 10 additions and 8 deletions
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3
fs/btrfs/ctree.h
View File

@ -82,9 +82,10 @@ struct btrfs_ordered_sum;
#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
/*
* All files have objectids higher than this.
* All files have objectids in this range.
*/
#define BTRFS_FIRST_FREE_OBJECTID 256ULL
#define BTRFS_LAST_FREE_OBJECTID -256ULL
#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL

15
fs/btrfs/inode-map.c
View File

@ -32,7 +32,8 @@ int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid)
path = btrfs_alloc_path();
BUG_ON(!path);
search_key.objectid = (u64)-1;
search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
search_key.type = -1;
search_key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
@ -70,16 +71,17 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
u64 search_start = dirid;
mutex_lock(&root->objectid_mutex);
if (root->last_inode_alloc) {
if (root->last_inode_alloc >= BTRFS_FIRST_FREE_OBJECTID &&
root->last_inode_alloc < BTRFS_LAST_FREE_OBJECTID) {
*objectid = ++root->last_inode_alloc;
mutex_unlock(&root->objectid_mutex);
return 0;
}
path = btrfs_alloc_path();
BUG_ON(!path);
search_start = root->last_inode_alloc;
search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
search_key.objectid = search_start;
search_key.type = 0;
search_key.offset = 0;
btrfs_init_path(path);
@ -88,9 +90,6 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
if (ret < 0)
goto error;
if (path->slots[0] > 0)
path->slots[0]--;
while (1) {
l = path->nodes[0];
slot = path->slots[0];
@ -120,13 +119,15 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
}
}
}
if (key.objectid >= BTRFS_LAST_FREE_OBJECTID)
break;
start_found = 1;
last_ino = key.objectid + 1;
path->slots[0]++;
}
// FIXME -ENOSPC
BUG_ON(1);
found:
root->last_inode_alloc = *objectid;
btrfs_release_path(root, path);
btrfs_free_path(path);
BUG_ON(*objectid < search_start);