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Diffstat (limited to 'fs/nfsd/nfsctl.c')
-rw-r--r--fs/nfsd/nfsctl.c238
1 files changed, 226 insertions, 12 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 0f154b0e1c8a..13c548733860 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Syscall interface to knfsd.
*
@@ -16,6 +17,7 @@
#include <linux/sunrpc/gss_krb5_enctypes.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/module.h>
+#include <linux/fsnotify.h>
#include "idmap.h"
#include "nfsd.h"
@@ -53,6 +55,7 @@ enum {
NFSD_RecoveryDir,
NFSD_V4EndGrace,
#endif
+ NFSD_MaxReserved
};
/*
@@ -1147,8 +1150,201 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
* populating the filesystem.
*/
+/* Basically copying rpc_get_inode. */
+static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
+{
+ struct inode *inode = new_inode(sb);
+ if (!inode)
+ return NULL;
+ /* Following advice from simple_fill_super documentation: */
+ inode->i_ino = iunique(sb, NFSD_MaxReserved);
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ inode->i_fop = &simple_dir_operations;
+ inode->i_op = &simple_dir_inode_operations;
+ inc_nlink(inode);
+ default:
+ break;
+ }
+ return inode;
+}
+
+static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode;
+
+ inode = nfsd_get_inode(dir->i_sb, mode);
+ if (!inode)
+ return -ENOMEM;
+ d_add(dentry, inode);
+ inc_nlink(dir);
+ fsnotify_mkdir(dir, dentry);
+ return 0;
+}
+
+static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
+{
+ struct inode *dir = parent->d_inode;
+ struct dentry *dentry;
+ int ret = -ENOMEM;
+
+ inode_lock(dir);
+ dentry = d_alloc_name(parent, name);
+ if (!dentry)
+ goto out_err;
+ ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
+ if (ret)
+ goto out_err;
+ if (ncl) {
+ d_inode(dentry)->i_private = ncl;
+ kref_get(&ncl->cl_ref);
+ }
+out:
+ inode_unlock(dir);
+ return dentry;
+out_err:
+ dentry = ERR_PTR(ret);
+ goto out;
+}
+
+static void clear_ncl(struct inode *inode)
+{
+ struct nfsdfs_client *ncl = inode->i_private;
+
+ inode->i_private = NULL;
+ synchronize_rcu();
+ kref_put(&ncl->cl_ref, ncl->cl_release);
+}
+
+
+static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc = inode->i_private;
+
+ if (nc)
+ kref_get(&nc->cl_ref);
+ return nc;
+}
+
+struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
+{
+ struct nfsdfs_client *nc;
+
+ rcu_read_lock();
+ nc = __get_nfsdfs_client(inode);
+ rcu_read_unlock();
+ return nc;
+}
+/* from __rpc_unlink */
+static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
+{
+ int ret;
+
+ clear_ncl(d_inode(dentry));
+ dget(dentry);
+ ret = simple_unlink(dir, dentry);
+ d_delete(dentry);
+ dput(dentry);
+ WARN_ON_ONCE(ret);
+}
+
+static void nfsdfs_remove_files(struct dentry *root)
+{
+ struct dentry *dentry, *tmp;
+
+ list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
+ if (!simple_positive(dentry)) {
+ WARN_ON_ONCE(1); /* I think this can't happen? */
+ continue;
+ }
+ nfsdfs_remove_file(d_inode(root), dentry);
+ }
+}
+
+/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
+ * code instead. */
+static int nfsdfs_create_files(struct dentry *root,
+ const struct tree_descr *files)
+{
+ struct inode *dir = d_inode(root);
+ struct inode *inode;
+ struct dentry *dentry;
+ int i;
+
+ inode_lock(dir);
+ for (i = 0; files->name && files->name[0]; i++, files++) {
+ if (!files->name)
+ continue;
+ dentry = d_alloc_name(root, files->name);
+ if (!dentry)
+ goto out;
+ inode = nfsd_get_inode(d_inode(root)->i_sb,
+ S_IFREG | files->mode);
+ if (!inode) {
+ dput(dentry);
+ goto out;
+ }
+ inode->i_fop = files->ops;
+ inode->i_private = __get_nfsdfs_client(dir);
+ d_add(dentry, inode);
+ fsnotify_create(dir, dentry);
+ }
+ inode_unlock(dir);
+ return 0;
+out:
+ nfsdfs_remove_files(root);
+ inode_unlock(dir);
+ return -ENOMEM;
+}
+
+/* on success, returns positive number unique to that client. */
+struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
+ struct nfsdfs_client *ncl, u32 id,
+ const struct tree_descr *files)
+{
+ struct dentry *dentry;
+ char name[11];
+ int ret;
+
+ sprintf(name, "%u", id);
+
+ dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
+ if (IS_ERR(dentry)) /* XXX: tossing errors? */
+ return NULL;
+ ret = nfsdfs_create_files(dentry, files);
+ if (ret) {
+ nfsd_client_rmdir(dentry);
+ return NULL;
+ }
+ return dentry;
+}
+
+/* Taken from __rpc_rmdir: */
+void nfsd_client_rmdir(struct dentry *dentry)
+{
+ struct inode *dir = d_inode(dentry->d_parent);
+ struct inode *inode = d_inode(dentry);
+ int ret;
+
+ inode_lock(dir);
+ nfsdfs_remove_files(dentry);
+ clear_ncl(inode);
+ dget(dentry);
+ ret = simple_rmdir(dir, dentry);
+ WARN_ON_ONCE(ret);
+ d_delete(dentry);
+ inode_unlock(dir);
+}
+
static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
{
+ struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+ nfsd_net_id);
+ struct dentry *dentry;
+ int ret;
+
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
@@ -1178,7 +1374,14 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
/* last one */ {""}
};
- return simple_fill_super(sb, 0x6e667364, nfsd_files);
+ ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
+ if (ret)
+ return ret;
+ dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ nn->nfsd_client_dir = dentry;
+ return 0;
}
static int nfsd_fs_get_tree(struct fs_context *fc)
@@ -1250,6 +1453,7 @@ unsigned int nfsd_net_id;
static __net_init int nfsd_init_net(struct net *net)
{
int retval;
+ struct vfsmount *mnt;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
retval = nfsd_export_init(net);
@@ -1260,18 +1464,33 @@ static __net_init int nfsd_init_net(struct net *net)
goto out_idmap_error;
nn->nfsd_versions = NULL;
nn->nfsd4_minorversions = NULL;
+ retval = nfsd_reply_cache_init(nn);
+ if (retval)
+ goto out_drc_error;
nn->nfsd4_lease = 90; /* default lease time */
nn->nfsd4_grace = 90;
nn->somebody_reclaimed = false;
nn->track_reclaim_completes = false;
nn->clverifier_counter = prandom_u32();
- nn->clientid_counter = prandom_u32();
+ nn->clientid_base = prandom_u32();
+ nn->clientid_counter = nn->clientid_base + 1;
nn->s2s_cp_cl_id = nn->clientid_counter++;
atomic_set(&nn->ntf_refcnt, 0);
init_waitqueue_head(&nn->ntf_wq);
+
+ mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
+ if (IS_ERR(mnt)) {
+ retval = PTR_ERR(mnt);
+ goto out_mount_err;
+ }
+ nn->nfsd_mnt = mnt;
return 0;
+out_mount_err:
+ nfsd_reply_cache_shutdown(nn);
+out_drc_error:
+ nfsd_idmap_shutdown(net);
out_idmap_error:
nfsd_export_shutdown(net);
out_export_error:
@@ -1280,6 +1499,10 @@ out_export_error:
static __net_exit void nfsd_exit_net(struct net *net)
{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ mntput(nn->nfsd_mnt);
+ nfsd_reply_cache_shutdown(nn);
nfsd_idmap_shutdown(net);
nfsd_export_shutdown(net);
nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
@@ -1309,13 +1532,8 @@ static int __init init_nfsd(void)
retval = nfsd4_init_pnfs();
if (retval)
goto out_free_slabs;
- retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
- if (retval)
- goto out_exit_pnfs;
+ nfsd_fault_inject_init(); /* nfsd fault injection controls */
nfsd_stat_init(); /* Statistics */
- retval = nfsd_reply_cache_init();
- if (retval)
- goto out_free_stat;
nfsd_lockd_init(); /* lockd->nfsd callbacks */
retval = create_proc_exports_entry();
if (retval)
@@ -1329,11 +1547,8 @@ out_free_all:
remove_proc_entry("fs/nfs", NULL);
out_free_lockd:
nfsd_lockd_shutdown();
- nfsd_reply_cache_shutdown();
-out_free_stat:
nfsd_stat_shutdown();
nfsd_fault_inject_cleanup();
-out_exit_pnfs:
nfsd4_exit_pnfs();
out_free_slabs:
nfsd4_free_slabs();
@@ -1346,7 +1561,6 @@ out_unregister_pernet:
static void __exit exit_nfsd(void)
{
- nfsd_reply_cache_shutdown();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
nfsd_stat_shutdown();
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-18 20:29:36 +0300