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NFSv4: Reduce stack footprint of nfs4_get_root()

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2010-04-16 16:22:48 -04:00
parent 04ffdbe2e6
commit 8bac9db9cf
1 changed files with 46 additions and 30 deletions
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76
fs/nfs/getroot.c
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@ -78,46 +78,52 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fsinfo fsinfo;
struct nfs_fattr fattr;
struct dentry *mntroot;
struct dentry *ret;
struct inode *inode;
int error;
/* get the actual root for this mount */
fsinfo.fattr = &fattr;
fsinfo.fattr = nfs_alloc_fattr();
if (fsinfo.fattr == NULL)
return ERR_PTR(-ENOMEM);
error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
ret = ERR_PTR(error);
goto out;
}
inode = nfs_fhget(sb, mntfh, fsinfo.fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
return ERR_CAST(inode);
ret = ERR_CAST(inode);
goto out;
}
error = nfs_superblock_set_dummy_root(sb, inode);
if (error != 0)
return ERR_PTR(error);
if (error != 0) {
ret = ERR_PTR(error);
goto out;
}
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
mntroot = d_obtain_alias(inode);
if (IS_ERR(mntroot)) {
ret = d_obtain_alias(inode);
if (IS_ERR(ret)) {
dprintk("nfs_get_root: get root dentry failed\n");
return mntroot;
goto out;
}
security_d_instantiate(mntroot, inode);
security_d_instantiate(ret, inode);
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
return mntroot;
if (ret->d_op == NULL)
ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
out:
nfs_free_fattr(fsinfo.fattr);
return ret;
}
#ifdef CONFIG_NFS_V4
@ -168,8 +174,8 @@ int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh)
struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fattr fattr;
struct dentry *mntroot;
struct nfs_fattr *fattr = NULL;
struct dentry *ret;
struct inode *inode;
int error;
@ -183,40 +189,50 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
return ERR_PTR(error);
}
fattr = nfs_alloc_fattr();
if (fattr == NULL)
return ERR_PTR(-ENOMEM);;
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
ret = ERR_PTR(error);
goto out;
}
inode = nfs_fhget(sb, mntfh, &fattr);
inode = nfs_fhget(sb, mntfh, fattr);
if (IS_ERR(inode)) {
dprintk("nfs_get_root: get root inode failed\n");
return ERR_CAST(inode);
ret = ERR_CAST(inode);
goto out;
}
error = nfs_superblock_set_dummy_root(sb, inode);
if (error != 0)
return ERR_PTR(error);
if (error != 0) {
ret = ERR_PTR(error);
goto out;
}
/* root dentries normally start off anonymous and get spliced in later
* if the dentry tree reaches them; however if the dentry already
* exists, we'll pick it up at this point and use it as the root
*/
mntroot = d_obtain_alias(inode);
if (IS_ERR(mntroot)) {
ret = d_obtain_alias(inode);
if (IS_ERR(ret)) {
dprintk("nfs_get_root: get root dentry failed\n");
return mntroot;
goto out;
}
security_d_instantiate(mntroot, inode);
security_d_instantiate(ret, inode);
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;
if (ret->d_op == NULL)
ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
out:
nfs_free_fattr(fattr);
dprintk("<-- nfs4_get_root()\n");
return mntroot;
return ret;
}
#endif /* CONFIG_NFS_V4 */