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Btrfs: Remove special cases for "." and ".." 

Date: Sun, 17 Aug 2008 15:14:48 +0100
We never get asked by the VFS to lookup either of them, and we can
handle the readdir() case a lot more simply, too.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
David Woodhouse 2008-08-17 15:14:48 +01:00 committed by Chris Mason
parent 21af804c07
commit 5ecc7e5d1d
1 changed files with 2 additions and 50 deletions
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52
fs/btrfs/inode.c
View File

@ -1702,42 +1702,9 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
struct btrfs_root *root = BTRFS_I(dir)->root; struct btrfs_root *root = BTRFS_I(dir)->root;
int ret = 0; int ret = 0;
if (namelen == 1 && strcmp(name, ".") == 0) {
location->objectid = dir->i_ino;
location->type = BTRFS_INODE_ITEM_KEY;
location->offset = 0;
return 0;
}
path = btrfs_alloc_path(); path = btrfs_alloc_path();
BUG_ON(!path); BUG_ON(!path);
if (namelen == 2 && strcmp(name, "..") == 0) {
struct btrfs_key key;
struct extent_buffer *leaf;
int slot;
key.objectid = dir->i_ino;
key.offset = (u64)-1;
btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
if (ret < 0 || path->slots[0] == 0)
goto out_err;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
BUG_ON(ret == 0);
ret = 0;
leaf = path->nodes[0];
slot = path->slots[0] - 1;
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid != dir->i_ino ||
key.type != BTRFS_INODE_REF_KEY) {
goto out_err;
}
location->objectid = key.offset;
location->type = BTRFS_INODE_ITEM_KEY;
location->offset = 0;
goto out;
}
di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
namelen, 0); namelen, 0);
if (IS_ERR(di)) if (IS_ERR(di))
@ -1960,29 +1927,14 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
/* special case for .., just use the back ref */ /* special case for .., just use the back ref */
if (filp->f_pos == 1) { if (filp->f_pos == 1) {
btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); u64 pino = parent_ino(filp->f_path.dentry);
key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0 || path->slots[0] == 0) {
btrfs_release_path(root, path);
goto read_dir_items;
}
BUG_ON(ret == 0);
leaf = path->nodes[0];
slot = path->slots[0] - 1;
btrfs_item_key_to_cpu(leaf, &found_key, slot);
btrfs_release_path(root, path);
if (found_key.objectid != key.objectid ||
found_key.type != BTRFS_INODE_REF_KEY)
goto read_dir_items;
over = filldir(dirent, "..", 2, over = filldir(dirent, "..", 2,
2, found_key.offset, DT_DIR); 2, pino, DT_DIR);
if (over) if (over)
goto nopos; goto nopos;
filp->f_pos = 2; filp->f_pos = 2;
} }
read_dir_items:
btrfs_set_key_type(&key, key_type); btrfs_set_key_type(&key, key_type);
key.offset = filp->f_pos; key.offset = filp->f_pos;