![Kinglong Mee](/assets/img/avatar_default.png)
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1424 lines
32 KiB
C
1424 lines
32 KiB
C
/*
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* Copyright (c) 2004 The Regents of the University of Michigan.
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* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/crypto.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <net/net_namespace.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfsd/cld.h>
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#include "nfsd.h"
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#include "state.h"
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#include "vfs.h"
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#include "netns.h"
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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/* Declarations */
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struct nfsd4_client_tracking_ops {
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int (*init)(struct net *);
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void (*exit)(struct net *);
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void (*create)(struct nfs4_client *);
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void (*remove)(struct nfs4_client *);
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int (*check)(struct nfs4_client *);
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void (*grace_done)(struct nfsd_net *, time_t);
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};
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/* Globals */
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static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
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static int
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nfs4_save_creds(const struct cred **original_creds)
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{
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struct cred *new;
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new = prepare_creds();
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if (!new)
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return -ENOMEM;
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new->fsuid = GLOBAL_ROOT_UID;
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new->fsgid = GLOBAL_ROOT_GID;
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*original_creds = override_creds(new);
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put_cred(new);
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return 0;
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}
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static void
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nfs4_reset_creds(const struct cred *original)
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{
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revert_creds(original);
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}
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static void
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md5_to_hex(char *out, char *md5)
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{
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int i;
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for (i=0; i<16; i++) {
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unsigned char c = md5[i];
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*out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
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*out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
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}
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*out = '\0';
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}
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static int
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nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
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{
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struct xdr_netobj cksum;
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struct hash_desc desc;
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struct scatterlist sg;
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int status;
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dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
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clname->len, clname->data);
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(desc.tfm)) {
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status = PTR_ERR(desc.tfm);
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goto out_no_tfm;
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}
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cksum.len = crypto_hash_digestsize(desc.tfm);
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cksum.data = kmalloc(cksum.len, GFP_KERNEL);
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if (cksum.data == NULL) {
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status = -ENOMEM;
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goto out;
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}
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sg_init_one(&sg, clname->data, clname->len);
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status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data);
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if (status)
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goto out;
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md5_to_hex(dname, cksum.data);
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status = 0;
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out:
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kfree(cksum.data);
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crypto_free_hash(desc.tfm);
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out_no_tfm:
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return status;
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}
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/*
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* If we had an error generating the recdir name for the legacy tracker
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* then warn the admin. If the error doesn't appear to be transient,
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* then disable recovery tracking.
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*/
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static void
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legacy_recdir_name_error(struct nfs4_client *clp, int error)
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{
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printk(KERN_ERR "NFSD: unable to generate recoverydir "
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"name (%d).\n", error);
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/*
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* if the algorithm just doesn't exist, then disable the recovery
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* tracker altogether. The crypto libs will generally return this if
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* FIPS is enabled as well.
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*/
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if (error == -ENOENT) {
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printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
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"Reboot recovery will not function correctly!\n");
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nfsd4_client_tracking_exit(clp->net);
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}
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}
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static void
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nfsd4_create_clid_dir(struct nfs4_client *clp)
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{
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const struct cred *original_cred;
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char dname[HEXDIR_LEN];
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struct dentry *dir, *dentry;
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struct nfs4_client_reclaim *crp;
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int status;
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
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return;
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if (!nn->rec_file)
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return;
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status = nfs4_make_rec_clidname(dname, &clp->cl_name);
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if (status)
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return legacy_recdir_name_error(clp, status);
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status = nfs4_save_creds(&original_cred);
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if (status < 0)
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return;
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status = mnt_want_write_file(nn->rec_file);
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if (status)
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goto out_creds;
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dir = nn->rec_file->f_path.dentry;
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/* lock the parent */
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mutex_lock(&dir->d_inode->i_mutex);
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dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
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if (IS_ERR(dentry)) {
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status = PTR_ERR(dentry);
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goto out_unlock;
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}
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if (dentry->d_inode)
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/*
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* In the 4.1 case, where we're called from
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* reclaim_complete(), records from the previous reboot
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* may still be left, so this is OK.
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*
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* In the 4.0 case, we should never get here; but we may
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* as well be forgiving and just succeed silently.
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*/
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goto out_put;
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status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
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out_put:
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dput(dentry);
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out_unlock:
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mutex_unlock(&dir->d_inode->i_mutex);
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if (status == 0) {
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if (nn->in_grace) {
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crp = nfs4_client_to_reclaim(dname, nn);
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if (crp)
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crp->cr_clp = clp;
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}
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vfs_fsync(nn->rec_file, 0);
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} else {
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printk(KERN_ERR "NFSD: failed to write recovery record"
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" (err %d); please check that %s exists"
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" and is writeable", status,
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user_recovery_dirname);
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}
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mnt_drop_write_file(nn->rec_file);
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out_creds:
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nfs4_reset_creds(original_cred);
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}
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typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
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struct name_list {
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char name[HEXDIR_LEN];
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struct list_head list;
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};
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struct nfs4_dir_ctx {
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struct dir_context ctx;
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struct list_head names;
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};
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static int
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nfsd4_build_namelist(void *arg, const char *name, int namlen,
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loff_t offset, u64 ino, unsigned int d_type)
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{
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struct nfs4_dir_ctx *ctx = arg;
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struct name_list *entry;
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if (namlen != HEXDIR_LEN - 1)
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return 0;
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entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
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if (entry == NULL)
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return -ENOMEM;
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memcpy(entry->name, name, HEXDIR_LEN - 1);
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entry->name[HEXDIR_LEN - 1] = '\0';
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list_add(&entry->list, &ctx->names);
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return 0;
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}
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static int
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nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
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{
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const struct cred *original_cred;
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struct dentry *dir = nn->rec_file->f_path.dentry;
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struct nfs4_dir_ctx ctx = {
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.ctx.actor = nfsd4_build_namelist,
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.names = LIST_HEAD_INIT(ctx.names)
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};
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int status;
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status = nfs4_save_creds(&original_cred);
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if (status < 0)
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return status;
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status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
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if (status < 0) {
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nfs4_reset_creds(original_cred);
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return status;
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}
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status = iterate_dir(nn->rec_file, &ctx.ctx);
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mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
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while (!list_empty(&ctx.names)) {
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struct name_list *entry;
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entry = list_entry(ctx.names.next, struct name_list, list);
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if (!status) {
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struct dentry *dentry;
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dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
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if (IS_ERR(dentry)) {
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status = PTR_ERR(dentry);
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break;
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}
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status = f(dir, dentry, nn);
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dput(dentry);
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}
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list_del(&entry->list);
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kfree(entry);
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}
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mutex_unlock(&dir->d_inode->i_mutex);
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nfs4_reset_creds(original_cred);
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return status;
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}
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static int
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nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
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{
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struct dentry *dir, *dentry;
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int status;
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dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
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dir = nn->rec_file->f_path.dentry;
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mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
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dentry = lookup_one_len(name, dir, namlen);
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if (IS_ERR(dentry)) {
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status = PTR_ERR(dentry);
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goto out_unlock;
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}
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status = -ENOENT;
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if (!dentry->d_inode)
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goto out;
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status = vfs_rmdir(dir->d_inode, dentry);
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out:
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dput(dentry);
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out_unlock:
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mutex_unlock(&dir->d_inode->i_mutex);
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return status;
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}
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static void
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nfsd4_remove_clid_dir(struct nfs4_client *clp)
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{
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const struct cred *original_cred;
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struct nfs4_client_reclaim *crp;
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char dname[HEXDIR_LEN];
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int status;
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struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
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if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
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return;
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status = nfs4_make_rec_clidname(dname, &clp->cl_name);
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if (status)
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return legacy_recdir_name_error(clp, status);
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status = mnt_want_write_file(nn->rec_file);
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if (status)
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goto out;
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clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
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status = nfs4_save_creds(&original_cred);
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if (status < 0)
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goto out_drop_write;
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status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
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nfs4_reset_creds(original_cred);
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if (status == 0) {
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vfs_fsync(nn->rec_file, 0);
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if (nn->in_grace) {
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/* remove reclaim record */
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crp = nfsd4_find_reclaim_client(dname, nn);
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if (crp)
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nfs4_remove_reclaim_record(crp, nn);
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}
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}
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out_drop_write:
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mnt_drop_write_file(nn->rec_file);
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out:
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if (status)
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printk("NFSD: Failed to remove expired client state directory"
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" %.*s\n", HEXDIR_LEN, dname);
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}
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static int
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purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
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{
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int status;
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if (nfs4_has_reclaimed_state(child->d_name.name, nn))
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return 0;
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status = vfs_rmdir(parent->d_inode, child);
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if (status)
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printk("failed to remove client recovery directory %pd\n",
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child);
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/* Keep trying, success or failure: */
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return 0;
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}
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static void
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nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time)
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{
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int status;
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nn->in_grace = false;
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if (!nn->rec_file)
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return;
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status = mnt_want_write_file(nn->rec_file);
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if (status)
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goto out;
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status = nfsd4_list_rec_dir(purge_old, nn);
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if (status == 0)
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vfs_fsync(nn->rec_file, 0);
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mnt_drop_write_file(nn->rec_file);
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out:
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nfs4_release_reclaim(nn);
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if (status)
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printk("nfsd4: failed to purge old clients from recovery"
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" directory %pD\n", nn->rec_file);
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}
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|
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static int
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load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
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{
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if (child->d_name.len != HEXDIR_LEN - 1) {
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printk("nfsd4: illegal name %pd in recovery directory\n",
|
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child);
|
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/* Keep trying; maybe the others are OK: */
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return 0;
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}
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nfs4_client_to_reclaim(child->d_name.name, nn);
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return 0;
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}
|
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|
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static int
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nfsd4_recdir_load(struct net *net) {
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int status;
|
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
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|
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if (!nn->rec_file)
|
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return 0;
|
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|
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status = nfsd4_list_rec_dir(load_recdir, nn);
|
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if (status)
|
|
printk("nfsd4: failed loading clients from recovery"
|
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" directory %pD\n", nn->rec_file);
|
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return status;
|
|
}
|
|
|
|
/*
|
|
* Hold reference to the recovery directory.
|
|
*/
|
|
|
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static int
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nfsd4_init_recdir(struct net *net)
|
|
{
|
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
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const struct cred *original_cred;
|
|
int status;
|
|
|
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printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
|
|
user_recovery_dirname);
|
|
|
|
BUG_ON(nn->rec_file);
|
|
|
|
status = nfs4_save_creds(&original_cred);
|
|
if (status < 0) {
|
|
printk("NFSD: Unable to change credentials to find recovery"
|
|
" directory: error %d\n",
|
|
status);
|
|
return status;
|
|
}
|
|
|
|
nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
|
|
if (IS_ERR(nn->rec_file)) {
|
|
printk("NFSD: unable to find recovery directory %s\n",
|
|
user_recovery_dirname);
|
|
status = PTR_ERR(nn->rec_file);
|
|
nn->rec_file = NULL;
|
|
}
|
|
|
|
nfs4_reset_creds(original_cred);
|
|
if (!status)
|
|
nn->in_grace = true;
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
nfsd4_shutdown_recdir(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (!nn->rec_file)
|
|
return;
|
|
fput(nn->rec_file);
|
|
nn->rec_file = NULL;
|
|
}
|
|
|
|
static int
|
|
nfs4_legacy_state_init(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
int i;
|
|
|
|
nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
|
|
CLIENT_HASH_SIZE, GFP_KERNEL);
|
|
if (!nn->reclaim_str_hashtbl)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
|
|
nn->reclaim_str_hashtbl_size = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
nfs4_legacy_state_shutdown(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
kfree(nn->reclaim_str_hashtbl);
|
|
}
|
|
|
|
static int
|
|
nfsd4_load_reboot_recovery_data(struct net *net)
|
|
{
|
|
int status;
|
|
|
|
status = nfsd4_init_recdir(net);
|
|
if (status)
|
|
return status;
|
|
|
|
status = nfsd4_recdir_load(net);
|
|
if (status)
|
|
nfsd4_shutdown_recdir(net);
|
|
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfsd4_legacy_tracking_init(struct net *net)
|
|
{
|
|
int status;
|
|
|
|
/* XXX: The legacy code won't work in a container */
|
|
if (net != &init_net) {
|
|
WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
|
|
"tracking in a container!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
status = nfs4_legacy_state_init(net);
|
|
if (status)
|
|
return status;
|
|
|
|
status = nfsd4_load_reboot_recovery_data(net);
|
|
if (status)
|
|
goto err;
|
|
return 0;
|
|
|
|
err:
|
|
nfs4_legacy_state_shutdown(net);
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
nfsd4_legacy_tracking_exit(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
nfs4_release_reclaim(nn);
|
|
nfsd4_shutdown_recdir(net);
|
|
nfs4_legacy_state_shutdown(net);
|
|
}
|
|
|
|
/*
|
|
* Change the NFSv4 recovery directory to recdir.
|
|
*/
|
|
int
|
|
nfs4_reset_recoverydir(char *recdir)
|
|
{
|
|
int status;
|
|
struct path path;
|
|
|
|
status = kern_path(recdir, LOOKUP_FOLLOW, &path);
|
|
if (status)
|
|
return status;
|
|
status = -ENOTDIR;
|
|
if (S_ISDIR(path.dentry->d_inode->i_mode)) {
|
|
strcpy(user_recovery_dirname, recdir);
|
|
status = 0;
|
|
}
|
|
path_put(&path);
|
|
return status;
|
|
}
|
|
|
|
char *
|
|
nfs4_recoverydir(void)
|
|
{
|
|
return user_recovery_dirname;
|
|
}
|
|
|
|
static int
|
|
nfsd4_check_legacy_client(struct nfs4_client *clp)
|
|
{
|
|
int status;
|
|
char dname[HEXDIR_LEN];
|
|
struct nfs4_client_reclaim *crp;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
/* did we already find that this client is stable? */
|
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
|
|
return 0;
|
|
|
|
status = nfs4_make_rec_clidname(dname, &clp->cl_name);
|
|
if (status) {
|
|
legacy_recdir_name_error(clp, status);
|
|
return status;
|
|
}
|
|
|
|
/* look for it in the reclaim hashtable otherwise */
|
|
crp = nfsd4_find_reclaim_client(dname, nn);
|
|
if (crp) {
|
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
|
|
crp->cr_clp = clp;
|
|
return 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
|
|
.init = nfsd4_legacy_tracking_init,
|
|
.exit = nfsd4_legacy_tracking_exit,
|
|
.create = nfsd4_create_clid_dir,
|
|
.remove = nfsd4_remove_clid_dir,
|
|
.check = nfsd4_check_legacy_client,
|
|
.grace_done = nfsd4_recdir_purge_old,
|
|
};
|
|
|
|
/* Globals */
|
|
#define NFSD_PIPE_DIR "nfsd"
|
|
#define NFSD_CLD_PIPE "cld"
|
|
|
|
/* per-net-ns structure for holding cld upcall info */
|
|
struct cld_net {
|
|
struct rpc_pipe *cn_pipe;
|
|
spinlock_t cn_lock;
|
|
struct list_head cn_list;
|
|
unsigned int cn_xid;
|
|
};
|
|
|
|
struct cld_upcall {
|
|
struct list_head cu_list;
|
|
struct cld_net *cu_net;
|
|
struct task_struct *cu_task;
|
|
struct cld_msg cu_msg;
|
|
};
|
|
|
|
static int
|
|
__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
|
|
{
|
|
int ret;
|
|
struct rpc_pipe_msg msg;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.data = cmsg;
|
|
msg.len = sizeof(*cmsg);
|
|
|
|
/*
|
|
* Set task state before we queue the upcall. That prevents
|
|
* wake_up_process in the downcall from racing with schedule.
|
|
*/
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
ret = rpc_queue_upcall(pipe, &msg);
|
|
if (ret < 0) {
|
|
set_current_state(TASK_RUNNING);
|
|
goto out;
|
|
}
|
|
|
|
schedule();
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
if (msg.errno < 0)
|
|
ret = msg.errno;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* -EAGAIN occurs when pipe is closed and reopened while there are
|
|
* upcalls queued.
|
|
*/
|
|
do {
|
|
ret = __cld_pipe_upcall(pipe, cmsg);
|
|
} while (ret == -EAGAIN);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
|
|
{
|
|
struct cld_upcall *tmp, *cup;
|
|
struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
|
|
uint32_t xid;
|
|
struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
|
|
nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
if (mlen != sizeof(*cmsg)) {
|
|
dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
|
|
sizeof(*cmsg));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* copy just the xid so we can try to find that */
|
|
if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
|
|
dprintk("%s: error when copying xid from userspace", __func__);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* walk the list and find corresponding xid */
|
|
cup = NULL;
|
|
spin_lock(&cn->cn_lock);
|
|
list_for_each_entry(tmp, &cn->cn_list, cu_list) {
|
|
if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
|
|
cup = tmp;
|
|
list_del_init(&cup->cu_list);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&cn->cn_lock);
|
|
|
|
/* couldn't find upcall? */
|
|
if (!cup) {
|
|
dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
|
|
return -EFAULT;
|
|
|
|
wake_up_process(cup->cu_task);
|
|
return mlen;
|
|
}
|
|
|
|
static void
|
|
cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
|
|
{
|
|
struct cld_msg *cmsg = msg->data;
|
|
struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
|
|
cu_msg);
|
|
|
|
/* errno >= 0 means we got a downcall */
|
|
if (msg->errno >= 0)
|
|
return;
|
|
|
|
wake_up_process(cup->cu_task);
|
|
}
|
|
|
|
static const struct rpc_pipe_ops cld_upcall_ops = {
|
|
.upcall = rpc_pipe_generic_upcall,
|
|
.downcall = cld_pipe_downcall,
|
|
.destroy_msg = cld_pipe_destroy_msg,
|
|
};
|
|
|
|
static struct dentry *
|
|
nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
|
|
{
|
|
struct dentry *dir, *dentry;
|
|
|
|
dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
|
|
if (dir == NULL)
|
|
return ERR_PTR(-ENOENT);
|
|
dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
|
|
dput(dir);
|
|
return dentry;
|
|
}
|
|
|
|
static void
|
|
nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
|
|
{
|
|
if (pipe->dentry)
|
|
rpc_unlink(pipe->dentry);
|
|
}
|
|
|
|
static struct dentry *
|
|
nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
|
|
{
|
|
struct super_block *sb;
|
|
struct dentry *dentry;
|
|
|
|
sb = rpc_get_sb_net(net);
|
|
if (!sb)
|
|
return NULL;
|
|
dentry = nfsd4_cld_register_sb(sb, pipe);
|
|
rpc_put_sb_net(net);
|
|
return dentry;
|
|
}
|
|
|
|
static void
|
|
nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
|
|
{
|
|
struct super_block *sb;
|
|
|
|
sb = rpc_get_sb_net(net);
|
|
if (sb) {
|
|
nfsd4_cld_unregister_sb(pipe);
|
|
rpc_put_sb_net(net);
|
|
}
|
|
}
|
|
|
|
/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
|
|
static int
|
|
nfsd4_init_cld_pipe(struct net *net)
|
|
{
|
|
int ret;
|
|
struct dentry *dentry;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct cld_net *cn;
|
|
|
|
if (nn->cld_net)
|
|
return 0;
|
|
|
|
cn = kzalloc(sizeof(*cn), GFP_KERNEL);
|
|
if (!cn) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
|
|
if (IS_ERR(cn->cn_pipe)) {
|
|
ret = PTR_ERR(cn->cn_pipe);
|
|
goto err;
|
|
}
|
|
spin_lock_init(&cn->cn_lock);
|
|
INIT_LIST_HEAD(&cn->cn_list);
|
|
|
|
dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto err_destroy_data;
|
|
}
|
|
|
|
cn->cn_pipe->dentry = dentry;
|
|
nn->cld_net = cn;
|
|
return 0;
|
|
|
|
err_destroy_data:
|
|
rpc_destroy_pipe_data(cn->cn_pipe);
|
|
err:
|
|
kfree(cn);
|
|
printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
nfsd4_remove_cld_pipe(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
nfsd4_cld_unregister_net(net, cn->cn_pipe);
|
|
rpc_destroy_pipe_data(cn->cn_pipe);
|
|
kfree(nn->cld_net);
|
|
nn->cld_net = NULL;
|
|
}
|
|
|
|
static struct cld_upcall *
|
|
alloc_cld_upcall(struct cld_net *cn)
|
|
{
|
|
struct cld_upcall *new, *tmp;
|
|
|
|
new = kzalloc(sizeof(*new), GFP_KERNEL);
|
|
if (!new)
|
|
return new;
|
|
|
|
/* FIXME: hard cap on number in flight? */
|
|
restart_search:
|
|
spin_lock(&cn->cn_lock);
|
|
list_for_each_entry(tmp, &cn->cn_list, cu_list) {
|
|
if (tmp->cu_msg.cm_xid == cn->cn_xid) {
|
|
cn->cn_xid++;
|
|
spin_unlock(&cn->cn_lock);
|
|
goto restart_search;
|
|
}
|
|
}
|
|
new->cu_task = current;
|
|
new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
|
|
put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
|
|
new->cu_net = cn;
|
|
list_add(&new->cu_list, &cn->cn_list);
|
|
spin_unlock(&cn->cn_lock);
|
|
|
|
dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
|
|
|
|
return new;
|
|
}
|
|
|
|
static void
|
|
free_cld_upcall(struct cld_upcall *victim)
|
|
{
|
|
struct cld_net *cn = victim->cu_net;
|
|
|
|
spin_lock(&cn->cn_lock);
|
|
list_del(&victim->cu_list);
|
|
spin_unlock(&cn->cn_lock);
|
|
kfree(victim);
|
|
}
|
|
|
|
/* Ask daemon to create a new record */
|
|
static void
|
|
nfsd4_cld_create(struct nfs4_client *clp)
|
|
{
|
|
int ret;
|
|
struct cld_upcall *cup;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
/* Don't upcall if it's already stored */
|
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
|
|
return;
|
|
|
|
cup = alloc_cld_upcall(cn);
|
|
if (!cup) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
cup->cu_msg.cm_cmd = Cld_Create;
|
|
cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
|
|
memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
|
|
clp->cl_name.len);
|
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
|
|
if (!ret) {
|
|
ret = cup->cu_msg.cm_status;
|
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
|
|
}
|
|
|
|
free_cld_upcall(cup);
|
|
out_err:
|
|
if (ret)
|
|
printk(KERN_ERR "NFSD: Unable to create client "
|
|
"record on stable storage: %d\n", ret);
|
|
}
|
|
|
|
/* Ask daemon to create a new record */
|
|
static void
|
|
nfsd4_cld_remove(struct nfs4_client *clp)
|
|
{
|
|
int ret;
|
|
struct cld_upcall *cup;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
/* Don't upcall if it's already removed */
|
|
if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
|
|
return;
|
|
|
|
cup = alloc_cld_upcall(cn);
|
|
if (!cup) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
cup->cu_msg.cm_cmd = Cld_Remove;
|
|
cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
|
|
memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
|
|
clp->cl_name.len);
|
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
|
|
if (!ret) {
|
|
ret = cup->cu_msg.cm_status;
|
|
clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
|
|
}
|
|
|
|
free_cld_upcall(cup);
|
|
out_err:
|
|
if (ret)
|
|
printk(KERN_ERR "NFSD: Unable to remove client "
|
|
"record from stable storage: %d\n", ret);
|
|
}
|
|
|
|
/* Check for presence of a record, and update its timestamp */
|
|
static int
|
|
nfsd4_cld_check(struct nfs4_client *clp)
|
|
{
|
|
int ret;
|
|
struct cld_upcall *cup;
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
/* Don't upcall if one was already stored during this grace pd */
|
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
|
|
return 0;
|
|
|
|
cup = alloc_cld_upcall(cn);
|
|
if (!cup) {
|
|
printk(KERN_ERR "NFSD: Unable to check client record on "
|
|
"stable storage: %d\n", -ENOMEM);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cup->cu_msg.cm_cmd = Cld_Check;
|
|
cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
|
|
memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
|
|
clp->cl_name.len);
|
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
|
|
if (!ret) {
|
|
ret = cup->cu_msg.cm_status;
|
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
|
|
}
|
|
|
|
free_cld_upcall(cup);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
|
|
{
|
|
int ret;
|
|
struct cld_upcall *cup;
|
|
struct cld_net *cn = nn->cld_net;
|
|
|
|
cup = alloc_cld_upcall(cn);
|
|
if (!cup) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
cup->cu_msg.cm_cmd = Cld_GraceDone;
|
|
cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
|
|
if (!ret)
|
|
ret = cup->cu_msg.cm_status;
|
|
|
|
free_cld_upcall(cup);
|
|
out_err:
|
|
if (ret)
|
|
printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
|
|
}
|
|
|
|
static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
|
|
.init = nfsd4_init_cld_pipe,
|
|
.exit = nfsd4_remove_cld_pipe,
|
|
.create = nfsd4_cld_create,
|
|
.remove = nfsd4_cld_remove,
|
|
.check = nfsd4_cld_check,
|
|
.grace_done = nfsd4_cld_grace_done,
|
|
};
|
|
|
|
/* upcall via usermodehelper */
|
|
static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
|
|
module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
|
|
S_IRUGO|S_IWUSR);
|
|
MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
|
|
|
|
static bool cltrack_legacy_disable;
|
|
module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
|
|
MODULE_PARM_DESC(cltrack_legacy_disable,
|
|
"Disable legacy recoverydir conversion. Default: false");
|
|
|
|
#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
|
|
#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
|
|
|
|
static char *
|
|
nfsd4_cltrack_legacy_topdir(void)
|
|
{
|
|
int copied;
|
|
size_t len;
|
|
char *result;
|
|
|
|
if (cltrack_legacy_disable)
|
|
return NULL;
|
|
|
|
len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
|
|
strlen(nfs4_recoverydir()) + 1;
|
|
|
|
result = kmalloc(len, GFP_KERNEL);
|
|
if (!result)
|
|
return result;
|
|
|
|
copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
|
|
nfs4_recoverydir());
|
|
if (copied >= len) {
|
|
/* just return nothing if output was truncated */
|
|
kfree(result);
|
|
return NULL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static char *
|
|
nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
|
|
{
|
|
int copied;
|
|
size_t len;
|
|
char *result;
|
|
|
|
if (cltrack_legacy_disable)
|
|
return NULL;
|
|
|
|
/* +1 is for '/' between "topdir" and "recdir" */
|
|
len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
|
|
strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
|
|
|
|
result = kmalloc(len, GFP_KERNEL);
|
|
if (!result)
|
|
return result;
|
|
|
|
copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
|
|
nfs4_recoverydir());
|
|
if (copied > (len - HEXDIR_LEN)) {
|
|
/* just return nothing if output will be truncated */
|
|
kfree(result);
|
|
return NULL;
|
|
}
|
|
|
|
copied = nfs4_make_rec_clidname(result + copied, name);
|
|
if (copied) {
|
|
kfree(result);
|
|
return NULL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
|
|
{
|
|
char *envp[2];
|
|
char *argv[4];
|
|
int ret;
|
|
|
|
if (unlikely(!cltrack_prog[0])) {
|
|
dprintk("%s: cltrack_prog is disabled\n", __func__);
|
|
return -EACCES;
|
|
}
|
|
|
|
dprintk("%s: cmd: %s\n", __func__, cmd);
|
|
dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
|
|
dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
|
|
|
|
envp[0] = legacy;
|
|
envp[1] = NULL;
|
|
|
|
argv[0] = (char *)cltrack_prog;
|
|
argv[1] = cmd;
|
|
argv[2] = arg;
|
|
argv[3] = NULL;
|
|
|
|
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
|
|
/*
|
|
* Disable the upcall mechanism if we're getting an ENOENT or EACCES
|
|
* error. The admin can re-enable it on the fly by using sysfs
|
|
* once the problem has been fixed.
|
|
*/
|
|
if (ret == -ENOENT || ret == -EACCES) {
|
|
dprintk("NFSD: %s was not found or isn't executable (%d). "
|
|
"Setting cltrack_prog to blank string!",
|
|
cltrack_prog, ret);
|
|
cltrack_prog[0] = '\0';
|
|
}
|
|
dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static char *
|
|
bin_to_hex_dup(const unsigned char *src, int srclen)
|
|
{
|
|
int i;
|
|
char *buf, *hex;
|
|
|
|
/* +1 for terminating NULL */
|
|
buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
|
|
if (!buf)
|
|
return buf;
|
|
|
|
hex = buf;
|
|
for (i = 0; i < srclen; i++) {
|
|
sprintf(hex, "%2.2x", *src++);
|
|
hex += 2;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
static int
|
|
nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
|
|
{
|
|
/* XXX: The usermode helper s not working in container yet. */
|
|
if (net != &init_net) {
|
|
WARN(1, KERN_ERR "NFSD: attempt to initialize umh client "
|
|
"tracking in a container!\n");
|
|
return -EINVAL;
|
|
}
|
|
return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
|
|
}
|
|
|
|
static void
|
|
nfsd4_umh_cltrack_create(struct nfs4_client *clp)
|
|
{
|
|
char *hexid;
|
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
|
|
if (!hexid) {
|
|
dprintk("%s: can't allocate memory for upcall!\n", __func__);
|
|
return;
|
|
}
|
|
nfsd4_umh_cltrack_upcall("create", hexid, NULL);
|
|
kfree(hexid);
|
|
}
|
|
|
|
static void
|
|
nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
|
|
{
|
|
char *hexid;
|
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
|
|
if (!hexid) {
|
|
dprintk("%s: can't allocate memory for upcall!\n", __func__);
|
|
return;
|
|
}
|
|
nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
|
|
kfree(hexid);
|
|
}
|
|
|
|
static int
|
|
nfsd4_umh_cltrack_check(struct nfs4_client *clp)
|
|
{
|
|
int ret;
|
|
char *hexid, *legacy;
|
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
|
|
if (!hexid) {
|
|
dprintk("%s: can't allocate memory for upcall!\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
|
|
ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
|
|
kfree(legacy);
|
|
kfree(hexid);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn,
|
|
time_t boot_time)
|
|
{
|
|
char *legacy;
|
|
char timestr[22]; /* FIXME: better way to determine max size? */
|
|
|
|
sprintf(timestr, "%ld", boot_time);
|
|
legacy = nfsd4_cltrack_legacy_topdir();
|
|
nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
|
|
kfree(legacy);
|
|
}
|
|
|
|
static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
|
|
.init = nfsd4_umh_cltrack_init,
|
|
.exit = NULL,
|
|
.create = nfsd4_umh_cltrack_create,
|
|
.remove = nfsd4_umh_cltrack_remove,
|
|
.check = nfsd4_umh_cltrack_check,
|
|
.grace_done = nfsd4_umh_cltrack_grace_done,
|
|
};
|
|
|
|
int
|
|
nfsd4_client_tracking_init(struct net *net)
|
|
{
|
|
int status;
|
|
struct path path;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
/* just run the init if it the method is already decided */
|
|
if (nn->client_tracking_ops)
|
|
goto do_init;
|
|
|
|
/*
|
|
* First, try a UMH upcall. It should succeed or fail quickly, so
|
|
* there's little harm in trying that first.
|
|
*/
|
|
nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
|
|
status = nn->client_tracking_ops->init(net);
|
|
if (!status)
|
|
return status;
|
|
|
|
/*
|
|
* See if the recoverydir exists and is a directory. If it is,
|
|
* then use the legacy ops.
|
|
*/
|
|
nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
|
|
status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
|
|
if (!status) {
|
|
status = S_ISDIR(path.dentry->d_inode->i_mode);
|
|
path_put(&path);
|
|
if (status)
|
|
goto do_init;
|
|
}
|
|
|
|
/* Finally, try to use nfsdcld */
|
|
nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
|
|
printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
|
|
"removed in 3.10. Please transition to using "
|
|
"nfsdcltrack.\n");
|
|
do_init:
|
|
status = nn->client_tracking_ops->init(net);
|
|
if (status) {
|
|
printk(KERN_WARNING "NFSD: Unable to initialize client "
|
|
"recovery tracking! (%d)\n", status);
|
|
nn->client_tracking_ops = NULL;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
void
|
|
nfsd4_client_tracking_exit(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (nn->client_tracking_ops) {
|
|
if (nn->client_tracking_ops->exit)
|
|
nn->client_tracking_ops->exit(net);
|
|
nn->client_tracking_ops = NULL;
|
|
}
|
|
}
|
|
|
|
void
|
|
nfsd4_client_record_create(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
if (nn->client_tracking_ops)
|
|
nn->client_tracking_ops->create(clp);
|
|
}
|
|
|
|
void
|
|
nfsd4_client_record_remove(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
if (nn->client_tracking_ops)
|
|
nn->client_tracking_ops->remove(clp);
|
|
}
|
|
|
|
int
|
|
nfsd4_client_record_check(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
|
|
|
|
if (nn->client_tracking_ops)
|
|
return nn->client_tracking_ops->check(clp);
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
void
|
|
nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
|
|
{
|
|
if (nn->client_tracking_ops)
|
|
nn->client_tracking_ops->grace_done(nn, boot_time);
|
|
}
|
|
|
|
static int
|
|
rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
|
|
{
|
|
struct super_block *sb = ptr;
|
|
struct net *net = sb->s_fs_info;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
struct cld_net *cn = nn->cld_net;
|
|
struct dentry *dentry;
|
|
int ret = 0;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return 0;
|
|
|
|
if (!cn) {
|
|
module_put(THIS_MODULE);
|
|
return 0;
|
|
}
|
|
|
|
switch (event) {
|
|
case RPC_PIPEFS_MOUNT:
|
|
dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
break;
|
|
}
|
|
cn->cn_pipe->dentry = dentry;
|
|
break;
|
|
case RPC_PIPEFS_UMOUNT:
|
|
if (cn->cn_pipe->dentry)
|
|
nfsd4_cld_unregister_sb(cn->cn_pipe);
|
|
break;
|
|
default:
|
|
ret = -ENOTSUPP;
|
|
break;
|
|
}
|
|
module_put(THIS_MODULE);
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block nfsd4_cld_block = {
|
|
.notifier_call = rpc_pipefs_event,
|
|
};
|
|
|
|
int
|
|
register_cld_notifier(void)
|
|
{
|
|
return rpc_pipefs_notifier_register(&nfsd4_cld_block);
|
|
}
|
|
|
|
void
|
|
unregister_cld_notifier(void)
|
|
{
|
|
rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
|
|
}
|