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Introduce btrfs_iget helper 

Date: Mon, 21 Jul 2008 02:01:04 +0530
This patch introduces a btrfs_iget helper to be used in NFS support.

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Balaji Rao 2008-07-21 02:01:04 +05:30 committed by Chris Mason
parent b64a2851ba
commit 1a54ef8c11
2 changed files with 38 additions and 17 deletions
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2
fs/btrfs/ctree.h
View File

@ -1700,6 +1700,8 @@ struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
struct btrfs_root *root);
struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
u64 root_objectid);
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
struct btrfs_root *root, int *is_new);
int btrfs_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to);
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,

45
fs/btrfs/inode.c
View File

@ -1840,6 +1840,33 @@ struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
return inode;
}
/* Get an inode object given its location and corresponding root.
* Returns in *is_new if the inode was read from disk
*/
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
struct btrfs_root *root, int *is_new)
{
struct inode *inode;
inode = btrfs_iget_locked(s, location->objectid, root);
if (!inode)
return ERR_PTR(-EACCES);
if (inode->i_state & I_NEW) {
BTRFS_I(inode)->root = root;
memcpy(&BTRFS_I(inode)->location, location, sizeof(*location));
btrfs_read_locked_inode(inode);
unlock_new_inode(inode);
if (is_new)
*is_new = 1;
} else {
if (is_new)
*is_new = 0;
}
return inode;
}
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
@ -1848,7 +1875,7 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct btrfs_root *root = bi->root;
struct btrfs_root *sub_root = root;
struct btrfs_key location;
int ret, do_orphan = 0;
int ret, new, do_orphan = 0;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
@ -1866,24 +1893,16 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
return ERR_PTR(ret);
if (ret > 0)
return ERR_PTR(-ENOENT);
inode = btrfs_iget(dir->i_sb, &location, sub_root, &new);
if (IS_ERR(inode))
return ERR_CAST(inode);
inode = btrfs_iget_locked(dir->i_sb, location.objectid,
sub_root);
if (!inode)
return ERR_PTR(-EACCES);
if (inode->i_state & I_NEW) {
/* the inode and parent dir are two different roots */
if (sub_root != root) {
if (new && root != sub_root) {
igrab(inode);
sub_root->inode = inode;
do_orphan = 1;
}
BTRFS_I(inode)->root = sub_root;
memcpy(&BTRFS_I(inode)->location, &location,
sizeof(location));
btrfs_read_locked_inode(inode);
unlock_new_inode(inode);
}
}
if (unlikely(do_orphan))