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fs/nfs/namespace.c
9.32 KB
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/* * linux/fs/nfs/namespace.c * * Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com> |
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* - Modified by David Howells <dhowells@redhat.com> |
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* * NFS namespace */ |
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#include <linux/dcache.h> |
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#include <linux/gfp.h> |
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#include <linux/mount.h> #include <linux/namei.h> #include <linux/nfs_fs.h> #include <linux/string.h> #include <linux/sunrpc/clnt.h> #include <linux/vfs.h> |
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#include <linux/sunrpc/gss_api.h> |
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#include "internal.h" |
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#define NFSDBG_FACILITY NFSDBG_VFS |
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static void nfs_expire_automounts(struct work_struct *work); |
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|
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static LIST_HEAD(nfs_automount_list); |
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static DECLARE_DELAYED_WORK(nfs_automount_task, nfs_expire_automounts); |
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int nfs_mountpoint_expiry_timeout = 500 * HZ; |
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static struct vfsmount *nfs_do_submount(struct dentry *dentry, |
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struct nfs_fh *fh, |
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struct nfs_fattr *fattr, rpc_authflavor_t authflavor); |
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|
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/* |
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* nfs_path - reconstruct the path given an arbitrary dentry |
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* @base - used to return pointer to the end of devname part of path |
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* @dentry - pointer to dentry * @buffer - result buffer * @buflen - length of buffer * |
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* Helper function for constructing the server pathname * by arbitrary hashed dentry. |
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* * This is mainly for use in figuring out the path on the |
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* server side when automounting on top of an existing partition * and in generating /proc/mounts and friends. |
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*/ |
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char *nfs_path(char **p, struct dentry *dentry, char *buffer, ssize_t buflen) |
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{ |
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char *end; |
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int namelen; |
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unsigned seq; |
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const char *base; |
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|
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rename_retry: end = buffer+buflen; |
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*--end = '\0'; buflen--; |
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seq = read_seqbegin(&rename_lock); rcu_read_lock(); |
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while (1) { spin_lock(&dentry->d_lock); if (IS_ROOT(dentry)) break; |
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namelen = dentry->d_name.len; buflen -= namelen + 1; if (buflen < 0) |
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goto Elong_unlock; |
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end -= namelen; memcpy(end, dentry->d_name.name, namelen); *--end = '/'; |
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spin_unlock(&dentry->d_lock); |
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dentry = dentry->d_parent; } |
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if (read_seqretry(&rename_lock, seq)) { spin_unlock(&dentry->d_lock); rcu_read_unlock(); |
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goto rename_retry; |
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} |
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if (*end != '/') { |
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if (--buflen < 0) { spin_unlock(&dentry->d_lock); rcu_read_unlock(); |
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goto Elong; |
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} |
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*--end = '/'; } |
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*p = end; base = dentry->d_fsdata; if (!base) { spin_unlock(&dentry->d_lock); rcu_read_unlock(); WARN_ON(1); return end; } |
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namelen = strlen(base); /* Strip off excess slashes in base string */ while (namelen > 0 && base[namelen - 1] == '/') namelen--; buflen -= namelen; |
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if (buflen < 0) { |
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spin_unlock(&dentry->d_lock); |
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rcu_read_unlock(); |
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goto Elong; |
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} |
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end -= namelen; memcpy(end, base, namelen); |
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spin_unlock(&dentry->d_lock); rcu_read_unlock(); |
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return end; |
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Elong_unlock: |
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spin_unlock(&dentry->d_lock); |
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rcu_read_unlock(); if (read_seqretry(&rename_lock, seq)) goto rename_retry; |
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Elong: return ERR_PTR(-ENAMETOOLONG); } |
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#ifdef CONFIG_NFS_V4 |
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rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *flavors) |
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{ struct gss_api_mech *mech; struct xdr_netobj oid; int i; rpc_authflavor_t pseudoflavor = RPC_AUTH_UNIX; for (i = 0; i < flavors->num_flavors; i++) { struct nfs4_secinfo_flavor *flavor; flavor = &flavors->flavors[i]; if (flavor->flavor == RPC_AUTH_NULL || flavor->flavor == RPC_AUTH_UNIX) { pseudoflavor = flavor->flavor; break; } else if (flavor->flavor == RPC_AUTH_GSS) { oid.len = flavor->gss.sec_oid4.len; oid.data = flavor->gss.sec_oid4.data; mech = gss_mech_get_by_OID(&oid); if (!mech) continue; pseudoflavor = gss_svc_to_pseudoflavor(mech, flavor->gss.service); gss_mech_put(mech); break; } } return pseudoflavor; } |
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static int nfs_negotiate_security(const struct dentry *parent, const struct dentry *dentry, rpc_authflavor_t *flavor) |
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{ |
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struct page *page; struct nfs4_secinfo_flavors *flavors; int (*secinfo)(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); |
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int ret = -EPERM; |
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secinfo = NFS_PROTO(parent->d_inode)->secinfo; if (secinfo != NULL) { page = alloc_page(GFP_KERNEL); if (!page) { |
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ret = -ENOMEM; |
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goto out; } flavors = page_address(page); |
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ret = secinfo(parent->d_inode, &dentry->d_name, flavors); |
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*flavor = nfs_find_best_sec(flavors); |
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put_page(page); } |
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out: |
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return ret; |
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} |
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static int nfs_lookup_with_sec(struct nfs_server *server, struct dentry *parent, struct dentry *dentry, struct path *path, struct nfs_fh *fh, struct nfs_fattr *fattr, rpc_authflavor_t *flavor) |
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{ |
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struct rpc_clnt *clone; struct rpc_auth *auth; int err; |
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err = nfs_negotiate_security(parent, path->dentry, flavor); if (err < 0) |
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goto out; clone = rpc_clone_client(server->client); |
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auth = rpcauth_create(*flavor, clone); |
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if (!auth) { |
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err = -EIO; |
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goto out_shutdown; |
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} err = server->nfs_client->rpc_ops->lookup(clone, parent->d_inode, &path->dentry->d_name, fh, fattr); |
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out_shutdown: rpc_shutdown_client(clone); |
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out: |
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return err; |
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} #else /* CONFIG_NFS_V4 */ |
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static inline int nfs_lookup_with_sec(struct nfs_server *server, struct dentry *parent, struct dentry *dentry, struct path *path, struct nfs_fh *fh, struct nfs_fattr *fattr, rpc_authflavor_t *flavor) |
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{ return -EPERM; } #endif /* CONFIG_NFS_V4 */ |
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/* |
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* nfs_d_automount - Handle crossing a mountpoint on the server * @path - The mountpoint |
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* * When we encounter a mountpoint on the server, we want to set up * a mountpoint on the client too, to prevent inode numbers from * colliding, and to allow "df" to work properly. * On NFSv4, we also want to allow for the fact that different * filesystems may be migrated to different servers in a failover * situation, and that different filesystems may want to use * different security flavours. */ |
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struct vfsmount *nfs_d_automount(struct path *path) |
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{ struct vfsmount *mnt; |
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struct nfs_server *server = NFS_SERVER(path->dentry->d_inode); |
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struct dentry *parent; |
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struct nfs_fh *fh = NULL; struct nfs_fattr *fattr = NULL; |
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int err; |
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rpc_authflavor_t flavor = RPC_AUTH_UNIX; |
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|
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dprintk("--> nfs_d_automount() "); |
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|
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mnt = ERR_PTR(-ESTALE); if (IS_ROOT(path->dentry)) goto out_nofree; |
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|
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mnt = ERR_PTR(-ENOMEM); |
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fh = nfs_alloc_fhandle(); fattr = nfs_alloc_fattr(); if (fh == NULL || fattr == NULL) |
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goto out; |
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|
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dprintk("%s: enter ", __func__); |
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|
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/* Look it up again to get its attributes */ parent = dget_parent(path->dentry); |
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err = server->nfs_client->rpc_ops->lookup(server->client, parent->d_inode, |
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&path->dentry->d_name, |
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fh, fattr); |
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if (err == -EPERM && NFS_PROTO(parent->d_inode)->secinfo != NULL) err = nfs_lookup_with_sec(server, parent, path->dentry, path, fh, fattr, &flavor); |
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dput(parent); |
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if (err != 0) { mnt = ERR_PTR(err); goto out; } |
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|
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if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
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mnt = nfs_do_refmount(path->dentry); |
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else |
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mnt = nfs_do_submount(path->dentry, fh, fattr, flavor); |
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if (IS_ERR(mnt)) |
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goto out; |
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|
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dprintk("%s: done, success ", __func__); mntget(mnt); /* prevent immediate expiration */ mnt_set_expiry(mnt, &nfs_automount_list); schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout); |
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|
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out: |
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nfs_free_fattr(fattr); nfs_free_fhandle(fh); |
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out_nofree: dprintk("<-- nfs_follow_mountpoint() = %p ", mnt); return mnt; |
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} |
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const struct inode_operations nfs_mountpoint_inode_operations = { |
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.getattr = nfs_getattr, }; |
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|
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const struct inode_operations nfs_referral_inode_operations = { |
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}; |
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static void nfs_expire_automounts(struct work_struct *work) |
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{ |
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struct list_head *list = &nfs_automount_list; |
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mark_mounts_for_expiry(list); if (!list_empty(list)) schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout); } void nfs_release_automount_timer(void) { |
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if (list_empty(&nfs_automount_list)) |
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cancel_delayed_work(&nfs_automount_task); |
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} |
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/* * Clone a mountpoint of the appropriate type */ |
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static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server, const char *devname, |
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struct nfs_clone_mount *mountdata) { #ifdef CONFIG_NFS_V4 |
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struct vfsmount *mnt = ERR_PTR(-EINVAL); |
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switch (server->nfs_client->rpc_ops->version) { |
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case 2: case 3: |
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mnt = vfs_kern_mount(&nfs_xdev_fs_type, 0, devname, mountdata); |
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break; case 4: |
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mnt = vfs_kern_mount(&nfs4_xdev_fs_type, 0, devname, mountdata); |
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} return mnt; #else |
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return vfs_kern_mount(&nfs_xdev_fs_type, 0, devname, mountdata); |
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#endif } /** * nfs_do_submount - set up mountpoint when crossing a filesystem boundary |
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* @dentry - parent directory * @fh - filehandle for new root dentry * @fattr - attributes for new root inode |
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* @authflavor - security flavor to use when performing the mount |
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* */ |
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static struct vfsmount *nfs_do_submount(struct dentry *dentry, |
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struct nfs_fh *fh, |
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struct nfs_fattr *fattr, rpc_authflavor_t authflavor) |
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{ struct nfs_clone_mount mountdata = { |
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.sb = dentry->d_sb, |
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.dentry = dentry, .fh = fh, .fattr = fattr, |
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.authflavor = authflavor, |
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}; struct vfsmount *mnt = ERR_PTR(-ENOMEM); char *page = (char *) __get_free_page(GFP_USER); char *devname; |
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dprintk("--> nfs_do_submount() "); |
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dprintk("%s: submounting on %s/%s ", __func__, |
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dentry->d_parent->d_name.name, dentry->d_name.name); if (page == NULL) goto out; |
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devname = nfs_devname(dentry, page, PAGE_SIZE); |
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mnt = (struct vfsmount *)devname; if (IS_ERR(devname)) goto free_page; |
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mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), devname, &mountdata); |
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free_page: free_page((unsigned long)page); out: |
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dprintk("%s: done ", __func__); |
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dprintk("<-- nfs_do_submount() = %p ", mnt); |
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return mnt; } |