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![Christoph Hellwig](/assets/img/avatar_default.png)
Now that the last user passing a NULL file pointer is gone we can remove the redundant dentry argument and associated hacks inside vfs_fsynmc_range. The next step will be removig the dentry argument from ->fsync, but given the luck with the last round of method prototype changes I'd rather defer this until after the main merge window. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
403 lines
9.3 KiB
C
403 lines
9.3 KiB
C
/*
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* Copyright (c) 2004 The Regents of the University of Michigan.
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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 "nfsd.h"
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#include "state.h"
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#include "vfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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/* Globals */
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static struct file *rec_file;
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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 = 0;
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new->fsgid = 0;
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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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__be32
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nfs4_make_rec_clidname(char *dname, 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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__be32 status = nfserr_resource;
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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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goto out_no_tfm;
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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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goto out;
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sg_init_one(&sg, clname->data, clname->len);
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if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
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goto out;
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md5_to_hex(dname, cksum.data);
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status = nfs_ok;
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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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int
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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 = clp->cl_recdir;
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struct dentry *dir, *dentry;
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int status;
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dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
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if (!rec_file || clp->cl_firststate)
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return 0;
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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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dir = 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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status = -EEXIST;
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if (dentry->d_inode) {
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dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
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goto out_put;
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}
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status = mnt_want_write(rec_file->f_path.mnt);
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if (status)
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goto out_put;
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status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
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mnt_drop_write(rec_file->f_path.mnt);
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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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clp->cl_firststate = 1;
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vfs_fsync(rec_file, 0);
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}
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nfs4_reset_creds(original_cred);
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dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
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return status;
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}
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typedef int (recdir_func)(struct dentry *, struct dentry *);
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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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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 list_head *names = 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, 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(struct dentry *dir, recdir_func *f)
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{
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const struct cred *original_cred;
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struct file *filp;
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LIST_HEAD(names);
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struct name_list *entry;
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struct dentry *dentry;
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int status;
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if (!rec_file)
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return 0;
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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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filp = dentry_open(dget(dir), mntget(rec_file->f_path.mnt), O_RDONLY,
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current_cred());
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status = PTR_ERR(filp);
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if (IS_ERR(filp))
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goto out;
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status = vfs_readdir(filp, nfsd4_build_namelist, &names);
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fput(filp);
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mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
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while (!list_empty(&names)) {
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entry = list_entry(names.next, struct name_list, list);
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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);
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dput(dentry);
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if (status)
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break;
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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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out:
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while (!list_empty(&names)) {
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entry = list_entry(names.next, struct name_list, list);
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list_del(&entry->list);
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kfree(entry);
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}
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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)
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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 = 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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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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int status;
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if (!rec_file || !clp->cl_firststate)
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return;
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status = mnt_want_write(rec_file->f_path.mnt);
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if (status)
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goto out;
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clp->cl_firststate = 0;
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status = nfs4_save_creds(&original_cred);
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if (status < 0)
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goto out;
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status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
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nfs4_reset_creds(original_cred);
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if (status == 0)
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vfs_fsync(rec_file, 0);
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mnt_drop_write(rec_file->f_path.mnt);
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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, clp->cl_recdir);
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return;
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}
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static int
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purge_old(struct dentry *parent, struct dentry *child)
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{
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int status;
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/* note: we currently use this path only for minorversion 0 */
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if (nfs4_has_reclaimed_state(child->d_name.name, false))
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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 %s\n",
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child->d_name.name);
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/* Keep trying, success or failure: */
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return 0;
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}
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void
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nfsd4_recdir_purge_old(void) {
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int status;
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if (!rec_file)
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return;
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status = mnt_want_write(rec_file->f_path.mnt);
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if (status)
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goto out;
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status = nfsd4_list_rec_dir(rec_file->f_path.dentry, purge_old);
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if (status == 0)
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vfs_fsync(rec_file, 0);
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mnt_drop_write(rec_file->f_path.mnt);
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out:
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if (status)
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printk("nfsd4: failed to purge old clients from recovery"
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" directory %s\n", rec_file->f_path.dentry->d_name.name);
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}
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static int
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load_recdir(struct dentry *parent, struct dentry *child)
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{
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if (child->d_name.len != HEXDIR_LEN - 1) {
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printk("nfsd4: illegal name %s in recovery directory\n",
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child->d_name.name);
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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);
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return 0;
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}
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int
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nfsd4_recdir_load(void) {
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int status;
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if (!rec_file)
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return 0;
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status = nfsd4_list_rec_dir(rec_file->f_path.dentry, load_recdir);
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if (status)
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printk("nfsd4: failed loading clients from recovery"
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" directory %s\n", rec_file->f_path.dentry->d_name.name);
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return status;
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}
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/*
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* Hold reference to the recovery directory.
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*/
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void
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nfsd4_init_recdir(char *rec_dirname)
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{
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const struct cred *original_cred;
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int status;
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printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
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rec_dirname);
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BUG_ON(rec_file);
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status = nfs4_save_creds(&original_cred);
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if (status < 0) {
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printk("NFSD: Unable to change credentials to find recovery"
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" directory: error %d\n",
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status);
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return;
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}
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rec_file = filp_open(rec_dirname, O_RDONLY | O_DIRECTORY, 0);
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if (IS_ERR(rec_file)) {
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printk("NFSD: unable to find recovery directory %s\n",
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rec_dirname);
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rec_file = NULL;
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}
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nfs4_reset_creds(original_cred);
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}
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void
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nfsd4_shutdown_recdir(void)
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{
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if (!rec_file)
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return;
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fput(rec_file);
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rec_file = NULL;
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}
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