nfs: store devname at disconnected NFS roots
part 2: make sure that disconnected roots have corresponding mnt_devname
values stashed into them.
Have nfs*_get_root() stuff a copy of devname into ->d_fsdata of the
found root, provided that it is disconnected.
Have ->d_release() free it when dentry goes away.
Have the places where NFS uses ->d_fsdata for sillyrename (and that
can *never* happen to a disconnected root - dentry will be attached
to its parent) free old devname copies if they find those.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index 4d6e5a3..1084792 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -82,12 +82,18 @@
struct nfs_fsinfo fsinfo;
struct dentry *ret;
struct inode *inode;
+ void *name = kstrdup(devname, GFP_KERNEL);
int error;
+ if (!name)
+ return ERR_PTR(-ENOMEM);
+
/* get the actual root for this mount */
fsinfo.fattr = nfs_alloc_fattr();
- if (fsinfo.fattr == NULL)
+ if (fsinfo.fattr == NULL) {
+ kfree(name);
return ERR_PTR(-ENOMEM);
+ }
error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
if (error < 0) {
@@ -120,7 +126,15 @@
}
security_d_instantiate(ret, inode);
+ spin_lock(&ret->d_lock);
+ if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
+ ret->d_fsdata = name;
+ name = NULL;
+ }
+ spin_unlock(&ret->d_lock);
out:
+ if (name)
+ kfree(name);
nfs_free_fattr(fsinfo.fattr);
return ret;
}
@@ -177,21 +191,28 @@
struct nfs_fattr *fattr = NULL;
struct dentry *ret;
struct inode *inode;
+ void *name = kstrdup(devname, GFP_KERNEL);
int error;
dprintk("--> nfs4_get_root()\n");
+ if (!name)
+ return ERR_PTR(-ENOMEM);
+
/* get the info about the server and filesystem */
error = nfs4_server_capabilities(server, mntfh);
if (error < 0) {
dprintk("nfs_get_root: getcaps error = %d\n",
-error);
+ kfree(name);
return ERR_PTR(error);
}
fattr = nfs_alloc_fattr();
- if (fattr == NULL)
- return ERR_PTR(-ENOMEM);;
+ if (fattr == NULL) {
+ kfree(name);
+ return ERR_PTR(-ENOMEM);
+ }
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
@@ -225,8 +246,15 @@
}
security_d_instantiate(ret, inode);
-
+ spin_lock(&ret->d_lock);
+ if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
+ ret->d_fsdata = name;
+ name = NULL;
+ }
+ spin_unlock(&ret->d_lock);
out:
+ if (name)
+ kfree(name);
nfs_free_fattr(fattr);
dprintk("<-- nfs4_get_root()\n");
return ret;