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2786 lines
74 KiB
2786 lines
74 KiB
/*
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* fs/nfs/nfs4proc.c
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*
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* Client-side procedure declarations for NFSv4.
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*
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* Copyright (c) 2002 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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* Andy Adamson <andros@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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#include <linux/mm.h>
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#include <linux/utsname.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_page.h>
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#include <linux/smp_lock.h>
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#include <linux/namei.h>
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#include "delegation.h"
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#define NFSDBG_FACILITY NFSDBG_PROC
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#define NFS4_POLL_RETRY_MIN (1*HZ)
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#define NFS4_POLL_RETRY_MAX (15*HZ)
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static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
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static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
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static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
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static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
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extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
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extern struct rpc_procinfo nfs4_procedures[];
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extern nfs4_stateid zero_stateid;
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/* Prevent leaks of NFSv4 errors into userland */
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int nfs4_map_errors(int err)
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{
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if (err < -1000) {
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dprintk("%s could not handle NFSv4 error %d\n",
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__FUNCTION__, -err);
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return -EIO;
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}
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return err;
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}
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/*
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* This is our standard bitmap for GETATTR requests.
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*/
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const u32 nfs4_fattr_bitmap[2] = {
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FATTR4_WORD0_TYPE
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| FATTR4_WORD0_CHANGE
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| FATTR4_WORD0_SIZE
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| FATTR4_WORD0_FSID
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| FATTR4_WORD0_FILEID,
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FATTR4_WORD1_MODE
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| FATTR4_WORD1_NUMLINKS
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| FATTR4_WORD1_OWNER
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| FATTR4_WORD1_OWNER_GROUP
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| FATTR4_WORD1_RAWDEV
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| FATTR4_WORD1_SPACE_USED
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| FATTR4_WORD1_TIME_ACCESS
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| FATTR4_WORD1_TIME_METADATA
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| FATTR4_WORD1_TIME_MODIFY
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};
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const u32 nfs4_statfs_bitmap[2] = {
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FATTR4_WORD0_FILES_AVAIL
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| FATTR4_WORD0_FILES_FREE
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| FATTR4_WORD0_FILES_TOTAL,
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FATTR4_WORD1_SPACE_AVAIL
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| FATTR4_WORD1_SPACE_FREE
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| FATTR4_WORD1_SPACE_TOTAL
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};
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u32 nfs4_pathconf_bitmap[2] = {
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FATTR4_WORD0_MAXLINK
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| FATTR4_WORD0_MAXNAME,
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0
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};
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const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
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| FATTR4_WORD0_MAXREAD
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| FATTR4_WORD0_MAXWRITE
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| FATTR4_WORD0_LEASE_TIME,
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0
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};
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static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
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struct nfs4_readdir_arg *readdir)
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{
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u32 *start, *p;
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BUG_ON(readdir->count < 80);
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if (cookie > 2) {
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readdir->cookie = (cookie > 2) ? cookie : 0;
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memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
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return;
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}
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readdir->cookie = 0;
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memset(&readdir->verifier, 0, sizeof(readdir->verifier));
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if (cookie == 2)
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return;
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/*
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* NFSv4 servers do not return entries for '.' and '..'
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* Therefore, we fake these entries here. We let '.'
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* have cookie 0 and '..' have cookie 1. Note that
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* when talking to the server, we always send cookie 0
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* instead of 1 or 2.
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*/
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start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
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if (cookie == 0) {
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*p++ = xdr_one; /* next */
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*p++ = xdr_zero; /* cookie, first word */
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*p++ = xdr_one; /* cookie, second word */
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*p++ = xdr_one; /* entry len */
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memcpy(p, ".\0\0\0", 4); /* entry */
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p++;
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*p++ = xdr_one; /* bitmap length */
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*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
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*p++ = htonl(8); /* attribute buffer length */
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p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
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}
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*p++ = xdr_one; /* next */
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*p++ = xdr_zero; /* cookie, first word */
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*p++ = xdr_two; /* cookie, second word */
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*p++ = xdr_two; /* entry len */
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memcpy(p, "..\0\0", 4); /* entry */
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p++;
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*p++ = xdr_one; /* bitmap length */
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*p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
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*p++ = htonl(8); /* attribute buffer length */
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p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
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readdir->pgbase = (char *)p - (char *)start;
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readdir->count -= readdir->pgbase;
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kunmap_atomic(start, KM_USER0);
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}
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static void
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renew_lease(struct nfs_server *server, unsigned long timestamp)
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{
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struct nfs4_client *clp = server->nfs4_state;
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spin_lock(&clp->cl_lock);
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if (time_before(clp->cl_last_renewal,timestamp))
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clp->cl_last_renewal = timestamp;
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spin_unlock(&clp->cl_lock);
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}
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static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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if (cinfo->before == nfsi->change_attr && cinfo->atomic)
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nfsi->change_attr = cinfo->after;
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}
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static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
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{
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struct inode *inode = state->inode;
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open_flags &= (FMODE_READ|FMODE_WRITE);
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/* Protect against nfs4_find_state() */
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spin_lock(&inode->i_lock);
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state->state |= open_flags;
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/* NB! List reordering - see the reclaim code for why. */
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if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
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list_move(&state->open_states, &state->owner->so_states);
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if (open_flags & FMODE_READ)
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state->nreaders++;
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memcpy(&state->stateid, stateid, sizeof(state->stateid));
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spin_unlock(&inode->i_lock);
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}
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/*
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* OPEN_RECLAIM:
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* reclaim state on the server after a reboot.
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* Assumes caller is holding the sp->so_sem
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*/
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static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
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{
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struct inode *inode = state->inode;
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_delegation *delegation = NFS_I(inode)->delegation;
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struct nfs_openargs o_arg = {
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.fh = NFS_FH(inode),
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.seqid = sp->so_seqid,
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.id = sp->so_id,
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.open_flags = state->state,
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.clientid = server->nfs4_state->cl_clientid,
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.claim = NFS4_OPEN_CLAIM_PREVIOUS,
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.bitmask = server->attr_bitmask,
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};
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struct nfs_openres o_res = {
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.server = server, /* Grrr */
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
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.rpc_argp = &o_arg,
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.rpc_resp = &o_res,
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.rpc_cred = sp->so_cred,
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};
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int status;
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if (delegation != NULL) {
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if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
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memcpy(&state->stateid, &delegation->stateid,
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sizeof(state->stateid));
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set_bit(NFS_DELEGATED_STATE, &state->flags);
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return 0;
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}
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o_arg.u.delegation_type = delegation->type;
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}
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status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
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nfs4_increment_seqid(status, sp);
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if (status == 0) {
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memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
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if (o_res.delegation_type != 0) {
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nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
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/* Did the server issue an immediate delegation recall? */
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if (o_res.do_recall)
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nfs_async_inode_return_delegation(inode, &o_res.stateid);
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}
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}
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clear_bit(NFS_DELEGATED_STATE, &state->flags);
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/* Ensure we update the inode attributes */
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NFS_CACHEINV(inode);
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return status;
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}
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static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
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{
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struct nfs_server *server = NFS_SERVER(state->inode);
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struct nfs4_exception exception = { };
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int err;
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do {
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err = _nfs4_open_reclaim(sp, state);
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switch (err) {
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case 0:
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case -NFS4ERR_STALE_CLIENTID:
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case -NFS4ERR_STALE_STATEID:
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case -NFS4ERR_EXPIRED:
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return err;
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}
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err = nfs4_handle_exception(server, err, &exception);
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} while (exception.retry);
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return err;
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}
|
|
|
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static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
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{
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struct nfs4_state_owner *sp = state->owner;
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struct inode *inode = dentry->d_inode;
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struct nfs_server *server = NFS_SERVER(inode);
|
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struct dentry *parent = dget_parent(dentry);
|
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struct nfs_openargs arg = {
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.fh = NFS_FH(parent->d_inode),
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.clientid = server->nfs4_state->cl_clientid,
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.name = &dentry->d_name,
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.id = sp->so_id,
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.server = server,
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.bitmask = server->attr_bitmask,
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.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
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};
|
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struct nfs_openres res = {
|
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.server = server,
|
|
};
|
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struct rpc_message msg = {
|
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
|
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.rpc_argp = &arg,
|
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.rpc_resp = &res,
|
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.rpc_cred = sp->so_cred,
|
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};
|
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int status = 0;
|
|
|
|
down(&sp->so_sema);
|
|
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
|
|
goto out;
|
|
if (state->state == 0)
|
|
goto out;
|
|
arg.seqid = sp->so_seqid;
|
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arg.open_flags = state->state;
|
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memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
|
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status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
|
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nfs4_increment_seqid(status, sp);
|
|
if (status >= 0) {
|
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memcpy(state->stateid.data, res.stateid.data,
|
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sizeof(state->stateid.data));
|
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clear_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
}
|
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out:
|
|
up(&sp->so_sema);
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dput(parent);
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|
return status;
|
|
}
|
|
|
|
int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
struct nfs_server *server = NFS_SERVER(dentry->d_inode);
|
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int err;
|
|
do {
|
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err = _nfs4_open_delegation_recall(dentry, state);
|
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switch (err) {
|
|
case 0:
|
|
return err;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
/* Don't recall a delegation if it was lost */
|
|
nfs4_schedule_state_recovery(server->nfs4_state);
|
|
return err;
|
|
}
|
|
err = nfs4_handle_exception(server, err, &exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static inline int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_open_confirmargs arg = {
|
|
.fh = fh,
|
|
.seqid = sp->so_seqid,
|
|
.stateid = *stateid,
|
|
};
|
|
struct nfs_open_confirmres res;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = sp->so_cred,
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
|
|
nfs4_increment_seqid(status, sp);
|
|
if (status >= 0)
|
|
memcpy(stateid, &res.stateid, sizeof(*stateid));
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
|
|
.rpc_argp = o_arg,
|
|
.rpc_resp = o_res,
|
|
.rpc_cred = sp->so_cred,
|
|
};
|
|
int status;
|
|
|
|
/* Update sequence id. The caller must serialize! */
|
|
o_arg->seqid = sp->so_seqid;
|
|
o_arg->id = sp->so_id;
|
|
o_arg->clientid = sp->so_client->cl_clientid;
|
|
|
|
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
|
|
nfs4_increment_seqid(status, sp);
|
|
if (status != 0)
|
|
goto out;
|
|
update_changeattr(dir, &o_res->cinfo);
|
|
if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
|
|
status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
|
|
sp, &o_res->stateid);
|
|
if (status != 0)
|
|
goto out;
|
|
}
|
|
if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
|
|
status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
|
|
{
|
|
struct nfs_access_entry cache;
|
|
int mask = 0;
|
|
int status;
|
|
|
|
if (openflags & FMODE_READ)
|
|
mask |= MAY_READ;
|
|
if (openflags & FMODE_WRITE)
|
|
mask |= MAY_WRITE;
|
|
status = nfs_access_get_cached(inode, cred, &cache);
|
|
if (status == 0)
|
|
goto out;
|
|
|
|
/* Be clever: ask server to check for all possible rights */
|
|
cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
|
|
cache.cred = cred;
|
|
cache.jiffies = jiffies;
|
|
status = _nfs4_proc_access(inode, &cache);
|
|
if (status != 0)
|
|
return status;
|
|
nfs_access_add_cache(inode, &cache);
|
|
out:
|
|
if ((cache.mask & mask) == mask)
|
|
return 0;
|
|
return -EACCES;
|
|
}
|
|
|
|
/*
|
|
* OPEN_EXPIRED:
|
|
* reclaim state on the server after a network partition.
|
|
* Assumes caller holds the appropriate lock
|
|
*/
|
|
static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
|
|
{
|
|
struct dentry *parent = dget_parent(dentry);
|
|
struct inode *dir = parent->d_inode;
|
|
struct inode *inode = state->inode;
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs_delegation *delegation = NFS_I(inode)->delegation;
|
|
struct nfs_fattr f_attr = {
|
|
.valid = 0,
|
|
};
|
|
struct nfs_openargs o_arg = {
|
|
.fh = NFS_FH(dir),
|
|
.open_flags = state->state,
|
|
.name = &dentry->d_name,
|
|
.bitmask = server->attr_bitmask,
|
|
.claim = NFS4_OPEN_CLAIM_NULL,
|
|
};
|
|
struct nfs_openres o_res = {
|
|
.f_attr = &f_attr,
|
|
.server = server,
|
|
};
|
|
int status = 0;
|
|
|
|
if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
|
|
status = _nfs4_do_access(inode, sp->so_cred, state->state);
|
|
if (status < 0)
|
|
goto out;
|
|
memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
|
|
set_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
goto out;
|
|
}
|
|
status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
|
|
if (status != 0)
|
|
goto out_nodeleg;
|
|
/* Check if files differ */
|
|
if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
|
|
goto out_stale;
|
|
/* Has the file handle changed? */
|
|
if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
|
|
/* Verify if the change attributes are the same */
|
|
if (f_attr.change_attr != NFS_I(inode)->change_attr)
|
|
goto out_stale;
|
|
if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
|
|
goto out_stale;
|
|
/* Lets just pretend that this is the same file */
|
|
nfs_copy_fh(NFS_FH(inode), &o_res.fh);
|
|
NFS_I(inode)->fileid = f_attr.fileid;
|
|
}
|
|
memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
|
|
if (o_res.delegation_type != 0) {
|
|
if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
|
|
nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
|
|
else
|
|
nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
|
|
}
|
|
out_nodeleg:
|
|
clear_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
out:
|
|
dput(parent);
|
|
return status;
|
|
out_stale:
|
|
status = -ESTALE;
|
|
/* Invalidate the state owner so we don't ever use it again */
|
|
nfs4_drop_state_owner(sp);
|
|
d_drop(dentry);
|
|
/* Should we be trying to close that stateid? */
|
|
goto out_nodeleg;
|
|
}
|
|
|
|
static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(state->inode);
|
|
struct nfs_open_context *ctx;
|
|
int status;
|
|
|
|
spin_lock(&state->inode->i_lock);
|
|
list_for_each_entry(ctx, &nfsi->open_files, list) {
|
|
if (ctx->state != state)
|
|
continue;
|
|
get_nfs_open_context(ctx);
|
|
spin_unlock(&state->inode->i_lock);
|
|
status = _nfs4_open_expired(sp, state, ctx->dentry);
|
|
put_nfs_open_context(ctx);
|
|
return status;
|
|
}
|
|
spin_unlock(&state->inode->i_lock);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* Returns an nfs4_state + an extra reference to the inode
|
|
*/
|
|
static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs4_state_owner *sp = NULL;
|
|
struct nfs4_state *state = NULL;
|
|
int open_flags = flags & (FMODE_READ|FMODE_WRITE);
|
|
int err;
|
|
|
|
/* Protect against reboot recovery - NOTE ORDER! */
|
|
down_read(&clp->cl_sem);
|
|
/* Protect against delegation recall */
|
|
down_read(&nfsi->rwsem);
|
|
delegation = NFS_I(inode)->delegation;
|
|
err = -ENOENT;
|
|
if (delegation == NULL || (delegation->type & open_flags) != open_flags)
|
|
goto out_err;
|
|
err = -ENOMEM;
|
|
if (!(sp = nfs4_get_state_owner(server, cred))) {
|
|
dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
|
|
goto out_err;
|
|
}
|
|
down(&sp->so_sema);
|
|
state = nfs4_get_open_state(inode, sp);
|
|
if (state == NULL)
|
|
goto out_err;
|
|
|
|
err = -ENOENT;
|
|
if ((state->state & open_flags) == open_flags) {
|
|
spin_lock(&inode->i_lock);
|
|
if (open_flags & FMODE_READ)
|
|
state->nreaders++;
|
|
if (open_flags & FMODE_WRITE)
|
|
state->nwriters++;
|
|
spin_unlock(&inode->i_lock);
|
|
goto out_ok;
|
|
} else if (state->state != 0)
|
|
goto out_err;
|
|
|
|
lock_kernel();
|
|
err = _nfs4_do_access(inode, cred, open_flags);
|
|
unlock_kernel();
|
|
if (err != 0)
|
|
goto out_err;
|
|
set_bit(NFS_DELEGATED_STATE, &state->flags);
|
|
update_open_stateid(state, &delegation->stateid, open_flags);
|
|
out_ok:
|
|
up(&sp->so_sema);
|
|
nfs4_put_state_owner(sp);
|
|
up_read(&nfsi->rwsem);
|
|
up_read(&clp->cl_sem);
|
|
igrab(inode);
|
|
*res = state;
|
|
return 0;
|
|
out_err:
|
|
if (sp != NULL) {
|
|
if (state != NULL)
|
|
nfs4_put_open_state(state);
|
|
up(&sp->so_sema);
|
|
nfs4_put_state_owner(sp);
|
|
}
|
|
up_read(&nfsi->rwsem);
|
|
up_read(&clp->cl_sem);
|
|
return err;
|
|
}
|
|
|
|
static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
struct nfs4_state *res;
|
|
int err;
|
|
|
|
do {
|
|
err = _nfs4_open_delegated(inode, flags, cred, &res);
|
|
if (err == 0)
|
|
break;
|
|
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
|
|
err, &exception));
|
|
} while (exception.retry);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Returns an nfs4_state + an referenced inode
|
|
*/
|
|
static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
|
|
{
|
|
struct nfs4_state_owner *sp;
|
|
struct nfs4_state *state = NULL;
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
struct inode *inode = NULL;
|
|
int status;
|
|
struct nfs_fattr f_attr = {
|
|
.valid = 0,
|
|
};
|
|
struct nfs_openargs o_arg = {
|
|
.fh = NFS_FH(dir),
|
|
.open_flags = flags,
|
|
.name = &dentry->d_name,
|
|
.server = server,
|
|
.bitmask = server->attr_bitmask,
|
|
.claim = NFS4_OPEN_CLAIM_NULL,
|
|
};
|
|
struct nfs_openres o_res = {
|
|
.f_attr = &f_attr,
|
|
.server = server,
|
|
};
|
|
|
|
/* Protect against reboot recovery conflicts */
|
|
down_read(&clp->cl_sem);
|
|
status = -ENOMEM;
|
|
if (!(sp = nfs4_get_state_owner(server, cred))) {
|
|
dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
|
|
goto out_err;
|
|
}
|
|
if (flags & O_EXCL) {
|
|
u32 *p = (u32 *) o_arg.u.verifier.data;
|
|
p[0] = jiffies;
|
|
p[1] = current->pid;
|
|
} else
|
|
o_arg.u.attrs = sattr;
|
|
/* Serialization for the sequence id */
|
|
down(&sp->so_sema);
|
|
|
|
status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
|
|
if (status != 0)
|
|
goto out_err;
|
|
|
|
status = -ENOMEM;
|
|
inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
|
|
if (!inode)
|
|
goto out_err;
|
|
state = nfs4_get_open_state(inode, sp);
|
|
if (!state)
|
|
goto out_err;
|
|
update_open_stateid(state, &o_res.stateid, flags);
|
|
if (o_res.delegation_type != 0)
|
|
nfs_inode_set_delegation(inode, cred, &o_res);
|
|
up(&sp->so_sema);
|
|
nfs4_put_state_owner(sp);
|
|
up_read(&clp->cl_sem);
|
|
*res = state;
|
|
return 0;
|
|
out_err:
|
|
if (sp != NULL) {
|
|
if (state != NULL)
|
|
nfs4_put_open_state(state);
|
|
up(&sp->so_sema);
|
|
nfs4_put_state_owner(sp);
|
|
}
|
|
/* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
|
|
up_read(&clp->cl_sem);
|
|
if (inode != NULL)
|
|
iput(inode);
|
|
*res = NULL;
|
|
return status;
|
|
}
|
|
|
|
|
|
static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
struct nfs4_state *res;
|
|
int status;
|
|
|
|
do {
|
|
status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
|
|
if (status == 0)
|
|
break;
|
|
/* NOTE: BAD_SEQID means the server and client disagree about the
|
|
* book-keeping w.r.t. state-changing operations
|
|
* (OPEN/CLOSE/LOCK/LOCKU...)
|
|
* It is actually a sign of a bug on the client or on the server.
|
|
*
|
|
* If we receive a BAD_SEQID error in the particular case of
|
|
* doing an OPEN, we assume that nfs4_increment_seqid() will
|
|
* have unhashed the old state_owner for us, and that we can
|
|
* therefore safely retry using a new one. We should still warn
|
|
* the user though...
|
|
*/
|
|
if (status == -NFS4ERR_BAD_SEQID) {
|
|
printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
|
|
exception.retry = 1;
|
|
continue;
|
|
}
|
|
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
|
|
status, &exception));
|
|
} while (exception.retry);
|
|
return res;
|
|
}
|
|
|
|
static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
|
|
struct nfs_fh *fhandle, struct iattr *sattr,
|
|
struct nfs4_state *state)
|
|
{
|
|
struct nfs_setattrargs arg = {
|
|
.fh = fhandle,
|
|
.iap = sattr,
|
|
.server = server,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct nfs_setattrres res = {
|
|
.fattr = fattr,
|
|
.server = server,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
};
|
|
|
|
fattr->valid = 0;
|
|
|
|
if (state != NULL)
|
|
msg.rpc_cred = state->owner->so_cred;
|
|
if (sattr->ia_valid & ATTR_SIZE)
|
|
nfs4_copy_stateid(&arg.stateid, state, NULL);
|
|
else
|
|
memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
|
|
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
|
|
struct nfs_fh *fhandle, struct iattr *sattr,
|
|
struct nfs4_state *state)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_do_setattr(server, fattr, fhandle, sattr,
|
|
state),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
struct nfs4_closedata {
|
|
struct inode *inode;
|
|
struct nfs4_state *state;
|
|
struct nfs_closeargs arg;
|
|
struct nfs_closeres res;
|
|
};
|
|
|
|
static void nfs4_close_done(struct rpc_task *task)
|
|
{
|
|
struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
|
|
struct nfs4_state *state = calldata->state;
|
|
struct nfs4_state_owner *sp = state->owner;
|
|
struct nfs_server *server = NFS_SERVER(calldata->inode);
|
|
|
|
/* hmm. we are done with the inode, and in the process of freeing
|
|
* the state_owner. we keep this around to process errors
|
|
*/
|
|
nfs4_increment_seqid(task->tk_status, sp);
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
memcpy(&state->stateid, &calldata->res.stateid,
|
|
sizeof(state->stateid));
|
|
break;
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
state->state = calldata->arg.open_flags;
|
|
nfs4_schedule_state_recovery(server->nfs4_state);
|
|
break;
|
|
default:
|
|
if (nfs4_async_handle_error(task, server) == -EAGAIN) {
|
|
rpc_restart_call(task);
|
|
return;
|
|
}
|
|
}
|
|
state->state = calldata->arg.open_flags;
|
|
nfs4_put_open_state(state);
|
|
up(&sp->so_sema);
|
|
nfs4_put_state_owner(sp);
|
|
up_read(&server->nfs4_state->cl_sem);
|
|
kfree(calldata);
|
|
}
|
|
|
|
static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
|
|
.rpc_argp = &calldata->arg,
|
|
.rpc_resp = &calldata->res,
|
|
.rpc_cred = calldata->state->owner->so_cred,
|
|
};
|
|
if (calldata->arg.open_flags != 0)
|
|
msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
|
|
return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata);
|
|
}
|
|
|
|
/*
|
|
* It is possible for data to be read/written from a mem-mapped file
|
|
* after the sys_close call (which hits the vfs layer as a flush).
|
|
* This means that we can't safely call nfsv4 close on a file until
|
|
* the inode is cleared. This in turn means that we are not good
|
|
* NFSv4 citizens - we do not indicate to the server to update the file's
|
|
* share state even when we are done with one of the three share
|
|
* stateid's in the inode.
|
|
*
|
|
* NOTE: Caller must be holding the sp->so_owner semaphore!
|
|
*/
|
|
int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
|
|
{
|
|
struct nfs4_closedata *calldata;
|
|
int status;
|
|
|
|
/* Tell caller we're done */
|
|
if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
|
|
state->state = mode;
|
|
return 0;
|
|
}
|
|
calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL);
|
|
if (calldata == NULL)
|
|
return -ENOMEM;
|
|
calldata->inode = inode;
|
|
calldata->state = state;
|
|
calldata->arg.fh = NFS_FH(inode);
|
|
/* Serialization for the sequence id */
|
|
calldata->arg.seqid = state->owner->so_seqid;
|
|
calldata->arg.open_flags = mode;
|
|
memcpy(&calldata->arg.stateid, &state->stateid,
|
|
sizeof(calldata->arg.stateid));
|
|
status = nfs4_close_call(NFS_SERVER(inode)->client, calldata);
|
|
/*
|
|
* Return -EINPROGRESS on success in order to indicate to the
|
|
* caller that an asynchronous RPC call has been launched, and
|
|
* that it will release the semaphores on completion.
|
|
*/
|
|
return (status == 0) ? -EINPROGRESS : status;
|
|
}
|
|
|
|
struct inode *
|
|
nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct iattr attr;
|
|
struct rpc_cred *cred;
|
|
struct nfs4_state *state;
|
|
|
|
if (nd->flags & LOOKUP_CREATE) {
|
|
attr.ia_mode = nd->intent.open.create_mode;
|
|
attr.ia_valid = ATTR_MODE;
|
|
if (!IS_POSIXACL(dir))
|
|
attr.ia_mode &= ~current->fs->umask;
|
|
} else {
|
|
attr.ia_valid = 0;
|
|
BUG_ON(nd->intent.open.flags & O_CREAT);
|
|
}
|
|
|
|
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
|
|
if (IS_ERR(cred))
|
|
return (struct inode *)cred;
|
|
state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
|
|
put_rpccred(cred);
|
|
if (IS_ERR(state))
|
|
return (struct inode *)state;
|
|
return state->inode;
|
|
}
|
|
|
|
int
|
|
nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
|
|
{
|
|
struct rpc_cred *cred;
|
|
struct nfs4_state *state;
|
|
struct inode *inode;
|
|
|
|
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
|
|
if (IS_ERR(cred))
|
|
return PTR_ERR(cred);
|
|
state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
|
|
if (IS_ERR(state))
|
|
state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
|
|
put_rpccred(cred);
|
|
if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
|
|
return 1;
|
|
if (IS_ERR(state))
|
|
return 0;
|
|
inode = state->inode;
|
|
if (inode == dentry->d_inode) {
|
|
iput(inode);
|
|
return 1;
|
|
}
|
|
d_drop(dentry);
|
|
nfs4_close_state(state, openflags);
|
|
iput(inode);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs4_server_caps_res res = {};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
|
|
.rpc_argp = fhandle,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_sync(server->client, &msg, 0);
|
|
if (status == 0) {
|
|
memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
|
|
if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
|
|
server->caps |= NFS_CAP_ACLS;
|
|
if (res.has_links != 0)
|
|
server->caps |= NFS_CAP_HARDLINKS;
|
|
if (res.has_symlinks != 0)
|
|
server->caps |= NFS_CAP_SYMLINKS;
|
|
server->acl_bitmask = res.acl_bitmask;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_server_capabilities(server, fhandle),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsinfo *info)
|
|
{
|
|
struct nfs_fattr * fattr = info->fattr;
|
|
struct nfs4_lookup_root_arg args = {
|
|
.bitmask = nfs4_fattr_bitmap,
|
|
};
|
|
struct nfs4_lookup_res res = {
|
|
.server = server,
|
|
.fattr = fattr,
|
|
.fh = fhandle,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
fattr->valid = 0;
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsinfo *info)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_lookup_root(server, fhandle, info),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsinfo *info)
|
|
{
|
|
struct nfs_fattr * fattr = info->fattr;
|
|
unsigned char * p;
|
|
struct qstr q;
|
|
struct nfs4_lookup_arg args = {
|
|
.dir_fh = fhandle,
|
|
.name = &q,
|
|
.bitmask = nfs4_fattr_bitmap,
|
|
};
|
|
struct nfs4_lookup_res res = {
|
|
.server = server,
|
|
.fattr = fattr,
|
|
.fh = fhandle,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
/*
|
|
* Now we do a separate LOOKUP for each component of the mount path.
|
|
* The LOOKUPs are done separately so that we can conveniently
|
|
* catch an ERR_WRONGSEC if it occurs along the way...
|
|
*/
|
|
status = nfs4_lookup_root(server, fhandle, info);
|
|
if (status)
|
|
goto out;
|
|
|
|
p = server->mnt_path;
|
|
for (;;) {
|
|
struct nfs4_exception exception = { };
|
|
|
|
while (*p == '/')
|
|
p++;
|
|
if (!*p)
|
|
break;
|
|
q.name = p;
|
|
while (*p && (*p != '/'))
|
|
p++;
|
|
q.len = p - q.name;
|
|
|
|
do {
|
|
fattr->valid = 0;
|
|
status = nfs4_handle_exception(server,
|
|
rpc_call_sync(server->client, &msg, 0),
|
|
&exception);
|
|
} while (exception.retry);
|
|
if (status == 0)
|
|
continue;
|
|
if (status == -ENOENT) {
|
|
printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
|
|
printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
|
|
}
|
|
break;
|
|
}
|
|
if (status == 0)
|
|
status = nfs4_server_capabilities(server, fhandle);
|
|
if (status == 0)
|
|
status = nfs4_do_fsinfo(server, fhandle, info);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs4_getattr_arg args = {
|
|
.fh = fhandle,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct nfs4_getattr_res res = {
|
|
.fattr = fattr,
|
|
.server = server,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
|
|
fattr->valid = 0;
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_proc_getattr(server, fhandle, fattr),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The file is not closed if it is opened due to the a request to change
|
|
* the size of the file. The open call will not be needed once the
|
|
* VFS layer lookup-intents are implemented.
|
|
*
|
|
* Close is called when the inode is destroyed.
|
|
* If we haven't opened the file for O_WRONLY, we
|
|
* need to in the size_change case to obtain a stateid.
|
|
*
|
|
* Got race?
|
|
* Because OPEN is always done by name in nfsv4, it is
|
|
* possible that we opened a different file by the same
|
|
* name. We can recognize this race condition, but we
|
|
* can't do anything about it besides returning an error.
|
|
*
|
|
* This will be fixed with VFS changes (lookup-intent).
|
|
*/
|
|
static int
|
|
nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
|
|
struct iattr *sattr)
|
|
{
|
|
struct inode * inode = dentry->d_inode;
|
|
int size_change = sattr->ia_valid & ATTR_SIZE;
|
|
struct nfs4_state *state = NULL;
|
|
int need_iput = 0;
|
|
int status;
|
|
|
|
fattr->valid = 0;
|
|
|
|
if (size_change) {
|
|
struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
|
|
if (IS_ERR(cred))
|
|
return PTR_ERR(cred);
|
|
state = nfs4_find_state(inode, cred, FMODE_WRITE);
|
|
if (state == NULL) {
|
|
state = nfs4_open_delegated(dentry->d_inode,
|
|
FMODE_WRITE, cred);
|
|
if (IS_ERR(state))
|
|
state = nfs4_do_open(dentry->d_parent->d_inode,
|
|
dentry, FMODE_WRITE,
|
|
NULL, cred);
|
|
need_iput = 1;
|
|
}
|
|
put_rpccred(cred);
|
|
if (IS_ERR(state))
|
|
return PTR_ERR(state);
|
|
|
|
if (state->inode != inode) {
|
|
printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
|
|
status = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
|
|
NFS_FH(inode), sattr, state);
|
|
out:
|
|
if (state) {
|
|
inode = state->inode;
|
|
nfs4_close_state(state, FMODE_WRITE);
|
|
if (need_iput)
|
|
iput(inode);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
|
|
struct nfs_fh *fhandle, struct nfs_fattr *fattr)
|
|
{
|
|
int status;
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs4_lookup_arg args = {
|
|
.bitmask = server->attr_bitmask,
|
|
.dir_fh = NFS_FH(dir),
|
|
.name = name,
|
|
};
|
|
struct nfs4_lookup_res res = {
|
|
.server = server,
|
|
.fattr = fattr,
|
|
.fh = fhandle,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
|
|
fattr->valid = 0;
|
|
|
|
dprintk("NFS call lookup %s\n", name->name);
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
dprintk("NFS reply lookup: %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dir),
|
|
_nfs4_proc_lookup(dir, name, fhandle, fattr),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
|
|
{
|
|
struct nfs4_accessargs args = {
|
|
.fh = NFS_FH(inode),
|
|
};
|
|
struct nfs4_accessres res = { 0 };
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = entry->cred,
|
|
};
|
|
int mode = entry->mask;
|
|
int status;
|
|
|
|
/*
|
|
* Determine which access bits we want to ask for...
|
|
*/
|
|
if (mode & MAY_READ)
|
|
args.access |= NFS4_ACCESS_READ;
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
if (mode & MAY_WRITE)
|
|
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
|
|
if (mode & MAY_EXEC)
|
|
args.access |= NFS4_ACCESS_LOOKUP;
|
|
} else {
|
|
if (mode & MAY_WRITE)
|
|
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
|
|
if (mode & MAY_EXEC)
|
|
args.access |= NFS4_ACCESS_EXECUTE;
|
|
}
|
|
status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
|
|
if (!status) {
|
|
entry->mask = 0;
|
|
if (res.access & NFS4_ACCESS_READ)
|
|
entry->mask |= MAY_READ;
|
|
if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
|
|
entry->mask |= MAY_WRITE;
|
|
if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
|
|
entry->mask |= MAY_EXEC;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(inode),
|
|
_nfs4_proc_access(inode, entry),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* TODO: For the time being, we don't try to get any attributes
|
|
* along with any of the zero-copy operations READ, READDIR,
|
|
* READLINK, WRITE.
|
|
*
|
|
* In the case of the first three, we want to put the GETATTR
|
|
* after the read-type operation -- this is because it is hard
|
|
* to predict the length of a GETATTR response in v4, and thus
|
|
* align the READ data correctly. This means that the GETATTR
|
|
* may end up partially falling into the page cache, and we should
|
|
* shift it into the 'tail' of the xdr_buf before processing.
|
|
* To do this efficiently, we need to know the total length
|
|
* of data received, which doesn't seem to be available outside
|
|
* of the RPC layer.
|
|
*
|
|
* In the case of WRITE, we also want to put the GETATTR after
|
|
* the operation -- in this case because we want to make sure
|
|
* we get the post-operation mtime and size. This means that
|
|
* we can't use xdr_encode_pages() as written: we need a variant
|
|
* of it which would leave room in the 'tail' iovec.
|
|
*
|
|
* Both of these changes to the XDR layer would in fact be quite
|
|
* minor, but I decided to leave them for a subsequent patch.
|
|
*/
|
|
static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
|
|
unsigned int pgbase, unsigned int pglen)
|
|
{
|
|
struct nfs4_readlink args = {
|
|
.fh = NFS_FH(inode),
|
|
.pgbase = pgbase,
|
|
.pglen = pglen,
|
|
.pages = &page,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = NULL,
|
|
};
|
|
|
|
return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
|
|
}
|
|
|
|
static int nfs4_proc_readlink(struct inode *inode, struct page *page,
|
|
unsigned int pgbase, unsigned int pglen)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(inode),
|
|
_nfs4_proc_readlink(inode, page, pgbase, pglen),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_read(struct nfs_read_data *rdata)
|
|
{
|
|
int flags = rdata->flags;
|
|
struct inode *inode = rdata->inode;
|
|
struct nfs_fattr *fattr = rdata->res.fattr;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
|
|
.rpc_argp = &rdata->args,
|
|
.rpc_resp = &rdata->res,
|
|
.rpc_cred = rdata->cred,
|
|
};
|
|
unsigned long timestamp = jiffies;
|
|
int status;
|
|
|
|
dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
|
|
(long long) rdata->args.offset);
|
|
|
|
fattr->valid = 0;
|
|
status = rpc_call_sync(server->client, &msg, flags);
|
|
if (!status)
|
|
renew_lease(server, timestamp);
|
|
dprintk("NFS reply read: %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_read(struct nfs_read_data *rdata)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
|
|
_nfs4_proc_read(rdata),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_write(struct nfs_write_data *wdata)
|
|
{
|
|
int rpcflags = wdata->flags;
|
|
struct inode *inode = wdata->inode;
|
|
struct nfs_fattr *fattr = wdata->res.fattr;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
|
|
.rpc_argp = &wdata->args,
|
|
.rpc_resp = &wdata->res,
|
|
.rpc_cred = wdata->cred,
|
|
};
|
|
int status;
|
|
|
|
dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
|
|
(long long) wdata->args.offset);
|
|
|
|
fattr->valid = 0;
|
|
status = rpc_call_sync(server->client, &msg, rpcflags);
|
|
dprintk("NFS reply write: %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_write(struct nfs_write_data *wdata)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
|
|
_nfs4_proc_write(wdata),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_commit(struct nfs_write_data *cdata)
|
|
{
|
|
struct inode *inode = cdata->inode;
|
|
struct nfs_fattr *fattr = cdata->res.fattr;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
|
|
.rpc_argp = &cdata->args,
|
|
.rpc_resp = &cdata->res,
|
|
.rpc_cred = cdata->cred,
|
|
};
|
|
int status;
|
|
|
|
dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
|
|
(long long) cdata->args.offset);
|
|
|
|
fattr->valid = 0;
|
|
status = rpc_call_sync(server->client, &msg, 0);
|
|
dprintk("NFS reply commit: %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_commit(struct nfs_write_data *cdata)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
|
|
_nfs4_proc_commit(cdata),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Got race?
|
|
* We will need to arrange for the VFS layer to provide an atomic open.
|
|
* Until then, this create/open method is prone to inefficiency and race
|
|
* conditions due to the lookup, create, and open VFS calls from sys_open()
|
|
* placed on the wire.
|
|
*
|
|
* Given the above sorry state of affairs, I'm simply sending an OPEN.
|
|
* The file will be opened again in the subsequent VFS open call
|
|
* (nfs4_proc_file_open).
|
|
*
|
|
* The open for read will just hang around to be used by any process that
|
|
* opens the file O_RDONLY. This will all be resolved with the VFS changes.
|
|
*/
|
|
|
|
static int
|
|
nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
|
|
int flags)
|
|
{
|
|
struct nfs4_state *state;
|
|
struct rpc_cred *cred;
|
|
int status = 0;
|
|
|
|
cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
|
|
if (IS_ERR(cred)) {
|
|
status = PTR_ERR(cred);
|
|
goto out;
|
|
}
|
|
state = nfs4_do_open(dir, dentry, flags, sattr, cred);
|
|
put_rpccred(cred);
|
|
if (IS_ERR(state)) {
|
|
status = PTR_ERR(state);
|
|
goto out;
|
|
}
|
|
d_instantiate(dentry, state->inode);
|
|
if (flags & O_EXCL) {
|
|
struct nfs_fattr fattr;
|
|
status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
|
|
NFS_FH(state->inode), sattr, state);
|
|
if (status == 0)
|
|
goto out;
|
|
} else if (flags != 0)
|
|
goto out;
|
|
nfs4_close_state(state, flags);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
|
|
{
|
|
struct nfs4_remove_arg args = {
|
|
.fh = NFS_FH(dir),
|
|
.name = name,
|
|
};
|
|
struct nfs4_change_info res;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
if (status == 0)
|
|
update_changeattr(dir, &res);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dir),
|
|
_nfs4_proc_remove(dir, name),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
struct unlink_desc {
|
|
struct nfs4_remove_arg args;
|
|
struct nfs4_change_info res;
|
|
};
|
|
|
|
static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
|
|
struct qstr *name)
|
|
{
|
|
struct unlink_desc *up;
|
|
|
|
up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
|
|
if (!up)
|
|
return -ENOMEM;
|
|
|
|
up->args.fh = NFS_FH(dir->d_inode);
|
|
up->args.name = name;
|
|
|
|
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
|
|
msg->rpc_argp = &up->args;
|
|
msg->rpc_resp = &up->res;
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
|
|
{
|
|
struct rpc_message *msg = &task->tk_msg;
|
|
struct unlink_desc *up;
|
|
|
|
if (msg->rpc_resp != NULL) {
|
|
up = container_of(msg->rpc_resp, struct unlink_desc, res);
|
|
update_changeattr(dir->d_inode, &up->res);
|
|
kfree(up);
|
|
msg->rpc_resp = NULL;
|
|
msg->rpc_argp = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
|
|
struct inode *new_dir, struct qstr *new_name)
|
|
{
|
|
struct nfs4_rename_arg arg = {
|
|
.old_dir = NFS_FH(old_dir),
|
|
.new_dir = NFS_FH(new_dir),
|
|
.old_name = old_name,
|
|
.new_name = new_name,
|
|
};
|
|
struct nfs4_rename_res res = { };
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
|
|
|
|
if (!status) {
|
|
update_changeattr(old_dir, &res.old_cinfo);
|
|
update_changeattr(new_dir, &res.new_cinfo);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
|
|
struct inode *new_dir, struct qstr *new_name)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(old_dir),
|
|
_nfs4_proc_rename(old_dir, old_name,
|
|
new_dir, new_name),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
|
|
{
|
|
struct nfs4_link_arg arg = {
|
|
.fh = NFS_FH(inode),
|
|
.dir_fh = NFS_FH(dir),
|
|
.name = name,
|
|
};
|
|
struct nfs4_change_info cinfo = { };
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &cinfo,
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
|
|
if (!status)
|
|
update_changeattr(dir, &cinfo);
|
|
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(inode),
|
|
_nfs4_proc_link(inode, dir, name),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
|
|
struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs4_create_arg arg = {
|
|
.dir_fh = NFS_FH(dir),
|
|
.server = server,
|
|
.name = name,
|
|
.attrs = sattr,
|
|
.ftype = NF4LNK,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct nfs4_create_res res = {
|
|
.server = server,
|
|
.fh = fhandle,
|
|
.fattr = fattr,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
if (path->len > NFS4_MAXPATHLEN)
|
|
return -ENAMETOOLONG;
|
|
arg.u.symlink = path;
|
|
fattr->valid = 0;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
if (!status)
|
|
update_changeattr(dir, &res.dir_cinfo);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
|
|
struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dir),
|
|
_nfs4_proc_symlink(dir, name, path, sattr,
|
|
fhandle, fattr),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
|
|
struct iattr *sattr)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs_fh fhandle;
|
|
struct nfs_fattr fattr;
|
|
struct nfs4_create_arg arg = {
|
|
.dir_fh = NFS_FH(dir),
|
|
.server = server,
|
|
.name = &dentry->d_name,
|
|
.attrs = sattr,
|
|
.ftype = NF4DIR,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct nfs4_create_res res = {
|
|
.server = server,
|
|
.fh = &fhandle,
|
|
.fattr = &fattr,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
|
|
fattr.valid = 0;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
if (!status) {
|
|
update_changeattr(dir, &res.dir_cinfo);
|
|
status = nfs_instantiate(dentry, &fhandle, &fattr);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
|
|
struct iattr *sattr)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dir),
|
|
_nfs4_proc_mkdir(dir, dentry, sattr),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
|
|
u64 cookie, struct page *page, unsigned int count, int plus)
|
|
{
|
|
struct inode *dir = dentry->d_inode;
|
|
struct nfs4_readdir_arg args = {
|
|
.fh = NFS_FH(dir),
|
|
.pages = &page,
|
|
.pgbase = 0,
|
|
.count = count,
|
|
.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
|
|
};
|
|
struct nfs4_readdir_res res;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = cred,
|
|
};
|
|
int status;
|
|
|
|
lock_kernel();
|
|
nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
|
|
res.pgbase = args.pgbase;
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
if (status == 0)
|
|
memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
|
|
unlock_kernel();
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
|
|
u64 cookie, struct page *page, unsigned int count, int plus)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
|
|
_nfs4_proc_readdir(dentry, cred, cookie,
|
|
page, count, plus),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
|
|
struct iattr *sattr, dev_t rdev)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(dir);
|
|
struct nfs_fh fh;
|
|
struct nfs_fattr fattr;
|
|
struct nfs4_create_arg arg = {
|
|
.dir_fh = NFS_FH(dir),
|
|
.server = server,
|
|
.name = &dentry->d_name,
|
|
.attrs = sattr,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct nfs4_create_res res = {
|
|
.server = server,
|
|
.fh = &fh,
|
|
.fattr = &fattr,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
};
|
|
int status;
|
|
int mode = sattr->ia_mode;
|
|
|
|
fattr.valid = 0;
|
|
|
|
BUG_ON(!(sattr->ia_valid & ATTR_MODE));
|
|
BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
|
|
if (S_ISFIFO(mode))
|
|
arg.ftype = NF4FIFO;
|
|
else if (S_ISBLK(mode)) {
|
|
arg.ftype = NF4BLK;
|
|
arg.u.device.specdata1 = MAJOR(rdev);
|
|
arg.u.device.specdata2 = MINOR(rdev);
|
|
}
|
|
else if (S_ISCHR(mode)) {
|
|
arg.ftype = NF4CHR;
|
|
arg.u.device.specdata1 = MAJOR(rdev);
|
|
arg.u.device.specdata2 = MINOR(rdev);
|
|
}
|
|
else
|
|
arg.ftype = NF4SOCK;
|
|
|
|
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
|
|
if (status == 0) {
|
|
update_changeattr(dir, &res.dir_cinfo);
|
|
status = nfs_instantiate(dentry, &fh, &fattr);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
|
|
struct iattr *sattr, dev_t rdev)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(dir),
|
|
_nfs4_proc_mknod(dir, dentry, sattr, rdev),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsstat *fsstat)
|
|
{
|
|
struct nfs4_statfs_arg args = {
|
|
.fh = fhandle,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = fsstat,
|
|
};
|
|
|
|
fsstat->fattr->valid = 0;
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_proc_statfs(server, fhandle, fsstat),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsinfo *fsinfo)
|
|
{
|
|
struct nfs4_fsinfo_arg args = {
|
|
.fh = fhandle,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = fsinfo,
|
|
};
|
|
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_do_fsinfo(server, fhandle, fsinfo),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
|
|
{
|
|
fsinfo->fattr->valid = 0;
|
|
return nfs4_do_fsinfo(server, fhandle, fsinfo);
|
|
}
|
|
|
|
static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_pathconf *pathconf)
|
|
{
|
|
struct nfs4_pathconf_arg args = {
|
|
.fh = fhandle,
|
|
.bitmask = server->attr_bitmask,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
|
|
.rpc_argp = &args,
|
|
.rpc_resp = pathconf,
|
|
};
|
|
|
|
/* None of the pathconf attributes are mandatory to implement */
|
|
if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
|
|
memset(pathconf, 0, sizeof(*pathconf));
|
|
return 0;
|
|
}
|
|
|
|
pathconf->fattr->valid = 0;
|
|
return rpc_call_sync(server->client, &msg, 0);
|
|
}
|
|
|
|
static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_pathconf *pathconf)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_handle_exception(server,
|
|
_nfs4_proc_pathconf(server, fhandle, pathconf),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
nfs4_read_done(struct rpc_task *task)
|
|
{
|
|
struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
|
|
struct inode *inode = data->inode;
|
|
|
|
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
|
|
rpc_restart_call(task);
|
|
return;
|
|
}
|
|
if (task->tk_status > 0)
|
|
renew_lease(NFS_SERVER(inode), data->timestamp);
|
|
/* Call back common NFS readpage processing */
|
|
nfs_readpage_result(task);
|
|
}
|
|
|
|
static void
|
|
nfs4_proc_read_setup(struct nfs_read_data *data)
|
|
{
|
|
struct rpc_task *task = &data->task;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
struct inode *inode = data->inode;
|
|
int flags;
|
|
|
|
data->timestamp = jiffies;
|
|
|
|
/* N.B. Do we need to test? Never called for swapfile inode */
|
|
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
|
|
|
|
/* Finalize the task. */
|
|
rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
|
|
rpc_call_setup(task, &msg, 0);
|
|
}
|
|
|
|
static void
|
|
nfs4_write_done(struct rpc_task *task)
|
|
{
|
|
struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
|
|
struct inode *inode = data->inode;
|
|
|
|
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
|
|
rpc_restart_call(task);
|
|
return;
|
|
}
|
|
if (task->tk_status >= 0)
|
|
renew_lease(NFS_SERVER(inode), data->timestamp);
|
|
/* Call back common NFS writeback processing */
|
|
nfs_writeback_done(task);
|
|
}
|
|
|
|
static void
|
|
nfs4_proc_write_setup(struct nfs_write_data *data, int how)
|
|
{
|
|
struct rpc_task *task = &data->task;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
struct inode *inode = data->inode;
|
|
int stable;
|
|
int flags;
|
|
|
|
if (how & FLUSH_STABLE) {
|
|
if (!NFS_I(inode)->ncommit)
|
|
stable = NFS_FILE_SYNC;
|
|
else
|
|
stable = NFS_DATA_SYNC;
|
|
} else
|
|
stable = NFS_UNSTABLE;
|
|
data->args.stable = stable;
|
|
|
|
data->timestamp = jiffies;
|
|
|
|
/* Set the initial flags for the task. */
|
|
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
|
|
|
|
/* Finalize the task. */
|
|
rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
|
|
rpc_call_setup(task, &msg, 0);
|
|
}
|
|
|
|
static void
|
|
nfs4_commit_done(struct rpc_task *task)
|
|
{
|
|
struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
|
|
struct inode *inode = data->inode;
|
|
|
|
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
|
|
rpc_restart_call(task);
|
|
return;
|
|
}
|
|
/* Call back common NFS writeback processing */
|
|
nfs_commit_done(task);
|
|
}
|
|
|
|
static void
|
|
nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
|
|
{
|
|
struct rpc_task *task = &data->task;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
struct inode *inode = data->inode;
|
|
int flags;
|
|
|
|
/* Set the initial flags for the task. */
|
|
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
|
|
|
|
/* Finalize the task. */
|
|
rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
|
|
rpc_call_setup(task, &msg, 0);
|
|
}
|
|
|
|
/*
|
|
* nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
|
|
* standalone procedure for queueing an asynchronous RENEW.
|
|
*/
|
|
static void
|
|
renew_done(struct rpc_task *task)
|
|
{
|
|
struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
|
|
unsigned long timestamp = (unsigned long)task->tk_calldata;
|
|
|
|
if (task->tk_status < 0) {
|
|
switch (task->tk_status) {
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_EXPIRED:
|
|
case -NFS4ERR_CB_PATH_DOWN:
|
|
nfs4_schedule_state_recovery(clp);
|
|
}
|
|
return;
|
|
}
|
|
spin_lock(&clp->cl_lock);
|
|
if (time_before(clp->cl_last_renewal,timestamp))
|
|
clp->cl_last_renewal = timestamp;
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
int
|
|
nfs4_proc_async_renew(struct nfs4_client *clp)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
|
|
.rpc_argp = clp,
|
|
.rpc_cred = clp->cl_cred,
|
|
};
|
|
|
|
return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
|
|
renew_done, (void *)jiffies);
|
|
}
|
|
|
|
int
|
|
nfs4_proc_renew(struct nfs4_client *clp)
|
|
{
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
|
|
.rpc_argp = clp,
|
|
.rpc_cred = clp->cl_cred,
|
|
};
|
|
unsigned long now = jiffies;
|
|
int status;
|
|
|
|
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
|
|
if (status < 0)
|
|
return status;
|
|
spin_lock(&clp->cl_lock);
|
|
if (time_before(clp->cl_last_renewal,now))
|
|
clp->cl_last_renewal = now;
|
|
spin_unlock(&clp->cl_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We will need to arrange for the VFS layer to provide an atomic open.
|
|
* Until then, this open method is prone to inefficiency and race conditions
|
|
* due to the lookup, potential create, and open VFS calls from sys_open()
|
|
* placed on the wire.
|
|
*/
|
|
static int
|
|
nfs4_proc_file_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dentry *dentry = filp->f_dentry;
|
|
struct nfs_open_context *ctx;
|
|
struct nfs4_state *state = NULL;
|
|
struct rpc_cred *cred;
|
|
int status = -ENOMEM;
|
|
|
|
dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
|
|
(int)dentry->d_parent->d_name.len,
|
|
dentry->d_parent->d_name.name,
|
|
(int)dentry->d_name.len, dentry->d_name.name);
|
|
|
|
|
|
/* Find our open stateid */
|
|
cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
|
|
if (IS_ERR(cred))
|
|
return PTR_ERR(cred);
|
|
ctx = alloc_nfs_open_context(dentry, cred);
|
|
put_rpccred(cred);
|
|
if (unlikely(ctx == NULL))
|
|
return -ENOMEM;
|
|
status = -EIO; /* ERACE actually */
|
|
state = nfs4_find_state(inode, cred, filp->f_mode);
|
|
if (unlikely(state == NULL))
|
|
goto no_state;
|
|
ctx->state = state;
|
|
nfs4_close_state(state, filp->f_mode);
|
|
ctx->mode = filp->f_mode;
|
|
nfs_file_set_open_context(filp, ctx);
|
|
put_nfs_open_context(ctx);
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
nfs_begin_data_update(inode);
|
|
return 0;
|
|
no_state:
|
|
printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
|
|
put_nfs_open_context(ctx);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Release our state
|
|
*/
|
|
static int
|
|
nfs4_proc_file_release(struct inode *inode, struct file *filp)
|
|
{
|
|
if (filp->f_mode & FMODE_WRITE)
|
|
nfs_end_data_update(inode);
|
|
nfs_file_clear_open_context(filp);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
|
|
{
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
|
|
if (!clp || task->tk_status >= 0)
|
|
return 0;
|
|
switch(task->tk_status) {
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
|
|
nfs4_schedule_state_recovery(clp);
|
|
if (test_bit(NFS4CLNT_OK, &clp->cl_state))
|
|
rpc_wake_up_task(task);
|
|
task->tk_status = 0;
|
|
return -EAGAIN;
|
|
case -NFS4ERR_GRACE:
|
|
case -NFS4ERR_DELAY:
|
|
rpc_delay(task, NFS4_POLL_RETRY_MAX);
|
|
task->tk_status = 0;
|
|
return -EAGAIN;
|
|
case -NFS4ERR_OLD_STATEID:
|
|
task->tk_status = 0;
|
|
return -EAGAIN;
|
|
}
|
|
task->tk_status = nfs4_map_errors(task->tk_status);
|
|
return 0;
|
|
}
|
|
|
|
static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
sigset_t oldset;
|
|
int interruptible, res = 0;
|
|
|
|
might_sleep();
|
|
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
interruptible = TASK_UNINTERRUPTIBLE;
|
|
if (clnt->cl_intr)
|
|
interruptible = TASK_INTERRUPTIBLE;
|
|
prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
|
|
nfs4_schedule_state_recovery(clp);
|
|
if (clnt->cl_intr && signalled())
|
|
res = -ERESTARTSYS;
|
|
else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
|
|
schedule();
|
|
finish_wait(&clp->cl_waitq, &wait);
|
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
return res;
|
|
}
|
|
|
|
static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
|
|
{
|
|
sigset_t oldset;
|
|
int res = 0;
|
|
|
|
might_sleep();
|
|
|
|
if (*timeout <= 0)
|
|
*timeout = NFS4_POLL_RETRY_MIN;
|
|
if (*timeout > NFS4_POLL_RETRY_MAX)
|
|
*timeout = NFS4_POLL_RETRY_MAX;
|
|
rpc_clnt_sigmask(clnt, &oldset);
|
|
if (clnt->cl_intr) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(*timeout);
|
|
if (signalled())
|
|
res = -ERESTARTSYS;
|
|
} else {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule_timeout(*timeout);
|
|
}
|
|
rpc_clnt_sigunmask(clnt, &oldset);
|
|
*timeout <<= 1;
|
|
return res;
|
|
}
|
|
|
|
/* This is the error handling routine for processes that are allowed
|
|
* to sleep.
|
|
*/
|
|
int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
|
|
{
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
int ret = errorcode;
|
|
|
|
exception->retry = 0;
|
|
switch(errorcode) {
|
|
case 0:
|
|
return 0;
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
ret = nfs4_wait_clnt_recover(server->client, clp);
|
|
if (ret == 0)
|
|
exception->retry = 1;
|
|
break;
|
|
case -NFS4ERR_GRACE:
|
|
case -NFS4ERR_DELAY:
|
|
ret = nfs4_delay(server->client, &exception->timeout);
|
|
if (ret == 0)
|
|
exception->retry = 1;
|
|
break;
|
|
case -NFS4ERR_OLD_STATEID:
|
|
if (ret == 0)
|
|
exception->retry = 1;
|
|
}
|
|
/* We failed to handle the error */
|
|
return nfs4_map_errors(ret);
|
|
}
|
|
|
|
int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
|
|
{
|
|
nfs4_verifier sc_verifier;
|
|
struct nfs4_setclientid setclientid = {
|
|
.sc_verifier = &sc_verifier,
|
|
.sc_prog = program,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
|
|
.rpc_argp = &setclientid,
|
|
.rpc_resp = clp,
|
|
.rpc_cred = clp->cl_cred,
|
|
};
|
|
u32 *p;
|
|
int loop = 0;
|
|
int status;
|
|
|
|
p = (u32*)sc_verifier.data;
|
|
*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
|
|
*p = htonl((u32)clp->cl_boot_time.tv_nsec);
|
|
|
|
for(;;) {
|
|
setclientid.sc_name_len = scnprintf(setclientid.sc_name,
|
|
sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
|
|
clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
|
|
clp->cl_cred->cr_ops->cr_name,
|
|
clp->cl_id_uniquifier);
|
|
setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
|
|
sizeof(setclientid.sc_netid), "tcp");
|
|
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
|
|
sizeof(setclientid.sc_uaddr), "%s.%d.%d",
|
|
clp->cl_ipaddr, port >> 8, port & 255);
|
|
|
|
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
|
|
if (status != -NFS4ERR_CLID_INUSE)
|
|
break;
|
|
if (signalled())
|
|
break;
|
|
if (loop++ & 1)
|
|
ssleep(clp->cl_lease_time + 1);
|
|
else
|
|
if (++clp->cl_id_uniquifier == 0)
|
|
break;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
int
|
|
nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
|
|
{
|
|
struct nfs_fsinfo fsinfo;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
|
|
.rpc_argp = clp,
|
|
.rpc_resp = &fsinfo,
|
|
.rpc_cred = clp->cl_cred,
|
|
};
|
|
unsigned long now;
|
|
int status;
|
|
|
|
now = jiffies;
|
|
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
|
|
if (status == 0) {
|
|
spin_lock(&clp->cl_lock);
|
|
clp->cl_lease_time = fsinfo.lease_time * HZ;
|
|
clp->cl_last_renewal = now;
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs4_delegreturnargs args = {
|
|
.fhandle = NFS_FH(inode),
|
|
.stateid = stateid,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
|
|
.rpc_argp = &args,
|
|
.rpc_cred = cred,
|
|
};
|
|
|
|
return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
|
|
}
|
|
|
|
int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
do {
|
|
err = _nfs4_proc_delegreturn(inode, cred, stateid);
|
|
switch (err) {
|
|
case -NFS4ERR_STALE_STATEID:
|
|
case -NFS4ERR_EXPIRED:
|
|
nfs4_schedule_state_recovery(server->nfs4_state);
|
|
case 0:
|
|
return 0;
|
|
}
|
|
err = nfs4_handle_exception(server, err, &exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
|
|
#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
|
|
|
|
/*
|
|
* sleep, with exponential backoff, and retry the LOCK operation.
|
|
*/
|
|
static unsigned long
|
|
nfs4_set_lock_task_retry(unsigned long timeout)
|
|
{
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule_timeout(timeout);
|
|
timeout <<= 1;
|
|
if (timeout > NFS4_LOCK_MAXTIMEOUT)
|
|
return NFS4_LOCK_MAXTIMEOUT;
|
|
return timeout;
|
|
}
|
|
|
|
static inline int
|
|
nfs4_lck_type(int cmd, struct file_lock *request)
|
|
{
|
|
/* set lock type */
|
|
switch (request->fl_type) {
|
|
case F_RDLCK:
|
|
return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
|
|
case F_WRLCK:
|
|
return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
|
|
case F_UNLCK:
|
|
return NFS4_WRITE_LT;
|
|
}
|
|
BUG();
|
|
return 0;
|
|
}
|
|
|
|
static inline uint64_t
|
|
nfs4_lck_length(struct file_lock *request)
|
|
{
|
|
if (request->fl_end == OFFSET_MAX)
|
|
return ~(uint64_t)0;
|
|
return request->fl_end - request->fl_start + 1;
|
|
}
|
|
|
|
static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
struct nfs_lockargs arg = {
|
|
.fh = NFS_FH(inode),
|
|
.type = nfs4_lck_type(cmd, request),
|
|
.offset = request->fl_start,
|
|
.length = nfs4_lck_length(request),
|
|
};
|
|
struct nfs_lockres res = {
|
|
.server = server,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = state->owner->so_cred,
|
|
};
|
|
struct nfs_lowner nlo;
|
|
struct nfs4_lock_state *lsp;
|
|
int status;
|
|
|
|
down_read(&clp->cl_sem);
|
|
nlo.clientid = clp->cl_clientid;
|
|
down(&state->lock_sema);
|
|
lsp = nfs4_find_lock_state(state, request->fl_owner);
|
|
if (lsp)
|
|
nlo.id = lsp->ls_id;
|
|
else {
|
|
spin_lock(&clp->cl_lock);
|
|
nlo.id = nfs4_alloc_lockowner_id(clp);
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
arg.u.lockt = &nlo;
|
|
status = rpc_call_sync(server->client, &msg, 0);
|
|
if (!status) {
|
|
request->fl_type = F_UNLCK;
|
|
} else if (status == -NFS4ERR_DENIED) {
|
|
int64_t len, start, end;
|
|
start = res.u.denied.offset;
|
|
len = res.u.denied.length;
|
|
end = start + len - 1;
|
|
if (end < 0 || len == 0)
|
|
request->fl_end = OFFSET_MAX;
|
|
else
|
|
request->fl_end = (loff_t)end;
|
|
request->fl_start = (loff_t)start;
|
|
request->fl_type = F_WRLCK;
|
|
if (res.u.denied.type & 1)
|
|
request->fl_type = F_RDLCK;
|
|
request->fl_pid = 0;
|
|
status = 0;
|
|
}
|
|
if (lsp)
|
|
nfs4_put_lock_state(lsp);
|
|
up(&state->lock_sema);
|
|
up_read(&clp->cl_sem);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(state->inode),
|
|
_nfs4_proc_getlk(state, cmd, request),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int do_vfs_lock(struct file *file, struct file_lock *fl)
|
|
{
|
|
int res = 0;
|
|
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
|
|
case FL_POSIX:
|
|
res = posix_lock_file_wait(file, fl);
|
|
break;
|
|
case FL_FLOCK:
|
|
res = flock_lock_file_wait(file, fl);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
if (res < 0)
|
|
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
|
|
__FUNCTION__);
|
|
return res;
|
|
}
|
|
|
|
static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs4_client *clp = server->nfs4_state;
|
|
struct nfs_lockargs arg = {
|
|
.fh = NFS_FH(inode),
|
|
.type = nfs4_lck_type(cmd, request),
|
|
.offset = request->fl_start,
|
|
.length = nfs4_lck_length(request),
|
|
};
|
|
struct nfs_lockres res = {
|
|
.server = server,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = state->owner->so_cred,
|
|
};
|
|
struct nfs4_lock_state *lsp;
|
|
struct nfs_locku_opargs luargs;
|
|
int status = 0;
|
|
|
|
down_read(&clp->cl_sem);
|
|
down(&state->lock_sema);
|
|
lsp = nfs4_find_lock_state(state, request->fl_owner);
|
|
if (!lsp)
|
|
goto out;
|
|
/* We might have lost the locks! */
|
|
if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
|
|
luargs.seqid = lsp->ls_seqid;
|
|
memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
|
|
arg.u.locku = &luargs;
|
|
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
|
|
nfs4_increment_lock_seqid(status, lsp);
|
|
}
|
|
|
|
if (status == 0) {
|
|
memcpy(&lsp->ls_stateid, &res.u.stateid,
|
|
sizeof(lsp->ls_stateid));
|
|
nfs4_notify_unlck(state, request, lsp);
|
|
}
|
|
nfs4_put_lock_state(lsp);
|
|
out:
|
|
up(&state->lock_sema);
|
|
if (status == 0)
|
|
do_vfs_lock(request->fl_file, request);
|
|
up_read(&clp->cl_sem);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(state->inode),
|
|
_nfs4_proc_unlck(state, cmd, request),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
|
|
{
|
|
struct inode *inode = state->inode;
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs4_lock_state *lsp;
|
|
struct nfs_lockargs arg = {
|
|
.fh = NFS_FH(inode),
|
|
.type = nfs4_lck_type(cmd, request),
|
|
.offset = request->fl_start,
|
|
.length = nfs4_lck_length(request),
|
|
};
|
|
struct nfs_lockres res = {
|
|
.server = server,
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = state->owner->so_cred,
|
|
};
|
|
struct nfs_lock_opargs largs = {
|
|
.reclaim = reclaim,
|
|
.new_lock_owner = 0,
|
|
};
|
|
int status;
|
|
|
|
lsp = nfs4_get_lock_state(state, request->fl_owner);
|
|
if (lsp == NULL)
|
|
return -ENOMEM;
|
|
if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
|
|
struct nfs4_state_owner *owner = state->owner;
|
|
struct nfs_open_to_lock otl = {
|
|
.lock_owner = {
|
|
.clientid = server->nfs4_state->cl_clientid,
|
|
},
|
|
};
|
|
|
|
otl.lock_seqid = lsp->ls_seqid;
|
|
otl.lock_owner.id = lsp->ls_id;
|
|
memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
|
|
largs.u.open_lock = &otl;
|
|
largs.new_lock_owner = 1;
|
|
arg.u.lock = &largs;
|
|
down(&owner->so_sema);
|
|
otl.open_seqid = owner->so_seqid;
|
|
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
|
|
/* increment open_owner seqid on success, and
|
|
* seqid mutating errors */
|
|
nfs4_increment_seqid(status, owner);
|
|
up(&owner->so_sema);
|
|
} else {
|
|
struct nfs_exist_lock el = {
|
|
.seqid = lsp->ls_seqid,
|
|
};
|
|
memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
|
|
largs.u.exist_lock = ⪙
|
|
largs.new_lock_owner = 0;
|
|
arg.u.lock = &largs;
|
|
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
|
|
}
|
|
/* increment seqid on success, and * seqid mutating errors*/
|
|
nfs4_increment_lock_seqid(status, lsp);
|
|
/* save the returned stateid. */
|
|
if (status == 0) {
|
|
memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
|
|
lsp->ls_flags |= NFS_LOCK_INITIALIZED;
|
|
if (!reclaim)
|
|
nfs4_notify_setlk(state, request, lsp);
|
|
} else if (status == -NFS4ERR_DENIED)
|
|
status = -EAGAIN;
|
|
nfs4_put_lock_state(lsp);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
|
|
{
|
|
return _nfs4_do_setlk(state, F_SETLK, request, 1);
|
|
}
|
|
|
|
static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
|
|
{
|
|
return _nfs4_do_setlk(state, F_SETLK, request, 0);
|
|
}
|
|
|
|
static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct nfs4_client *clp = state->owner->so_client;
|
|
int status;
|
|
|
|
down_read(&clp->cl_sem);
|
|
down(&state->lock_sema);
|
|
status = _nfs4_do_setlk(state, cmd, request, 0);
|
|
up(&state->lock_sema);
|
|
if (status == 0) {
|
|
/* Note: we always want to sleep here! */
|
|
request->fl_flags |= FL_SLEEP;
|
|
if (do_vfs_lock(request->fl_file, request) < 0)
|
|
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
|
|
}
|
|
up_read(&clp->cl_sem);
|
|
return status;
|
|
}
|
|
|
|
static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
|
|
{
|
|
struct nfs4_exception exception = { };
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_handle_exception(NFS_SERVER(state->inode),
|
|
_nfs4_proc_setlk(state, cmd, request),
|
|
&exception);
|
|
} while (exception.retry);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
struct nfs4_state *state;
|
|
unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
|
|
int status;
|
|
|
|
/* verify open state */
|
|
ctx = (struct nfs_open_context *)filp->private_data;
|
|
state = ctx->state;
|
|
|
|
if (request->fl_start < 0 || request->fl_end < 0)
|
|
return -EINVAL;
|
|
|
|
if (IS_GETLK(cmd))
|
|
return nfs4_proc_getlk(state, F_GETLK, request);
|
|
|
|
if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
|
|
return -EINVAL;
|
|
|
|
if (request->fl_type == F_UNLCK)
|
|
return nfs4_proc_unlck(state, cmd, request);
|
|
|
|
do {
|
|
status = nfs4_proc_setlk(state, cmd, request);
|
|
if ((status != -EAGAIN) || IS_SETLK(cmd))
|
|
break;
|
|
timeout = nfs4_set_lock_task_retry(timeout);
|
|
status = -ERESTARTSYS;
|
|
if (signalled())
|
|
break;
|
|
} while(status < 0);
|
|
|
|
return status;
|
|
}
|
|
|
|
struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
|
|
.recover_open = nfs4_open_reclaim,
|
|
.recover_lock = nfs4_lock_reclaim,
|
|
};
|
|
|
|
struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
|
|
.recover_open = nfs4_open_expired,
|
|
.recover_lock = nfs4_lock_expired,
|
|
};
|
|
|
|
struct nfs_rpc_ops nfs_v4_clientops = {
|
|
.version = 4, /* protocol version */
|
|
.dentry_ops = &nfs4_dentry_operations,
|
|
.dir_inode_ops = &nfs4_dir_inode_operations,
|
|
.getroot = nfs4_proc_get_root,
|
|
.getattr = nfs4_proc_getattr,
|
|
.setattr = nfs4_proc_setattr,
|
|
.lookup = nfs4_proc_lookup,
|
|
.access = nfs4_proc_access,
|
|
.readlink = nfs4_proc_readlink,
|
|
.read = nfs4_proc_read,
|
|
.write = nfs4_proc_write,
|
|
.commit = nfs4_proc_commit,
|
|
.create = nfs4_proc_create,
|
|
.remove = nfs4_proc_remove,
|
|
.unlink_setup = nfs4_proc_unlink_setup,
|
|
.unlink_done = nfs4_proc_unlink_done,
|
|
.rename = nfs4_proc_rename,
|
|
.link = nfs4_proc_link,
|
|
.symlink = nfs4_proc_symlink,
|
|
.mkdir = nfs4_proc_mkdir,
|
|
.rmdir = nfs4_proc_remove,
|
|
.readdir = nfs4_proc_readdir,
|
|
.mknod = nfs4_proc_mknod,
|
|
.statfs = nfs4_proc_statfs,
|
|
.fsinfo = nfs4_proc_fsinfo,
|
|
.pathconf = nfs4_proc_pathconf,
|
|
.decode_dirent = nfs4_decode_dirent,
|
|
.read_setup = nfs4_proc_read_setup,
|
|
.write_setup = nfs4_proc_write_setup,
|
|
.commit_setup = nfs4_proc_commit_setup,
|
|
.file_open = nfs4_proc_file_open,
|
|
.file_release = nfs4_proc_file_release,
|
|
.lock = nfs4_proc_lock,
|
|
};
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|
|
|