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- /*
- * fs/nfsd/nfs4proc.c
- *
- * Server-side procedures for NFSv4.
- *
- * Copyright (c) 2002 The Regents of the University of Michigan.
- * All rights reserved.
- *
- * Kendrick Smith <kmsmith@umich.edu>
- * Andy Adamson <andros@umich.edu>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <linux/param.h>
- #include <linux/major.h>
- #include <linux/slab.h>
- #include <linux/file.h>
- #include <linux/sunrpc/svc.h>
- #include <linux/nfsd/nfsd.h>
- #include <linux/nfsd/cache.h>
- #include <linux/nfs4.h>
- #include <linux/nfsd/state.h>
- #include <linux/nfsd/xdr4.h>
- #include <linux/nfs4_acl.h>
- #define NFSDDBG_FACILITY NFSDDBG_PROC
- static inline void
- fh_dup2(struct svc_fh *dst, struct svc_fh *src)
- {
- fh_put(dst);
- dget(src->fh_dentry);
- if (src->fh_export)
- cache_get(&src->fh_export->h);
- *dst = *src;
- }
- static __be32
- do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
- {
- __be32 status;
- if (open->op_truncate &&
- !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
- return nfserr_inval;
- if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
- accmode |= MAY_READ;
- if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
- accmode |= (MAY_WRITE | MAY_TRUNC);
- if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
- accmode |= MAY_WRITE;
- status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
- return status;
- }
- static __be32
- do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
- {
- struct svc_fh resfh;
- __be32 status;
- int created = 0;
- fh_init(&resfh, NFS4_FHSIZE);
- open->op_truncate = 0;
- if (open->op_create) {
- /*
- * Note: create modes (UNCHECKED,GUARDED...) are the same
- * in NFSv4 as in v3.
- */
- status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
- open->op_fname.len, &open->op_iattr,
- &resfh, open->op_createmode,
- (u32 *)open->op_verf.data, &open->op_truncate, &created);
- } else {
- status = nfsd_lookup(rqstp, current_fh,
- open->op_fname.data, open->op_fname.len, &resfh);
- fh_unlock(current_fh);
- }
- if (status)
- goto out;
- set_change_info(&open->op_cinfo, current_fh);
- /* set reply cache */
- fh_dup2(current_fh, &resfh);
- open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
- memcpy(open->op_stateowner->so_replay.rp_openfh,
- &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
- if (!created)
- status = do_open_permission(rqstp, current_fh, open, MAY_NOP);
- out:
- fh_put(&resfh);
- return status;
- }
- static __be32
- do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
- {
- __be32 status;
- /* Only reclaims from previously confirmed clients are valid */
- if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
- return status;
- /* We don't know the target directory, and therefore can not
- * set the change info
- */
- memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
- /* set replay cache */
- open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
- memcpy(open->op_stateowner->so_replay.rp_openfh,
- ¤t_fh->fh_handle.fh_base,
- current_fh->fh_handle.fh_size);
- open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
- (open->op_iattr.ia_size == 0);
- status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);
- return status;
- }
- static __be32
- nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_open *open)
- {
- __be32 status;
- dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
- (int)open->op_fname.len, open->op_fname.data,
- open->op_stateowner);
- /* This check required by spec. */
- if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
- return nfserr_inval;
- nfs4_lock_state();
- /* check seqid for replay. set nfs4_owner */
- status = nfsd4_process_open1(open);
- if (status == nfserr_replay_me) {
- struct nfs4_replay *rp = &open->op_stateowner->so_replay;
- fh_put(&cstate->current_fh);
- cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
- memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
- rp->rp_openfh_len);
- status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
- if (status)
- dprintk("nfsd4_open: replay failed"
- " restoring previous filehandle\n");
- else
- status = nfserr_replay_me;
- }
- if (status)
- goto out;
- /* Openowner is now set, so sequence id will get bumped. Now we need
- * these checks before we do any creates: */
- status = nfserr_grace;
- if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
- goto out;
- status = nfserr_no_grace;
- if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
- goto out;
- switch (open->op_claim_type) {
- case NFS4_OPEN_CLAIM_DELEGATE_CUR:
- status = nfserr_inval;
- if (open->op_create)
- goto out;
- /* fall through */
- case NFS4_OPEN_CLAIM_NULL:
- /*
- * (1) set CURRENT_FH to the file being opened,
- * creating it if necessary, (2) set open->op_cinfo,
- * (3) set open->op_truncate if the file is to be
- * truncated after opening, (4) do permission checking.
- */
- status = do_open_lookup(rqstp, &cstate->current_fh,
- open);
- if (status)
- goto out;
- break;
- case NFS4_OPEN_CLAIM_PREVIOUS:
- open->op_stateowner->so_confirmed = 1;
- /*
- * The CURRENT_FH is already set to the file being
- * opened. (1) set open->op_cinfo, (2) set
- * open->op_truncate if the file is to be truncated
- * after opening, (3) do permission checking.
- */
- status = do_open_fhandle(rqstp, &cstate->current_fh,
- open);
- if (status)
- goto out;
- break;
- case NFS4_OPEN_CLAIM_DELEGATE_PREV:
- open->op_stateowner->so_confirmed = 1;
- printk("NFSD: unsupported OPEN claim type %d\n",
- open->op_claim_type);
- status = nfserr_notsupp;
- goto out;
- default:
- printk("NFSD: Invalid OPEN claim type %d\n",
- open->op_claim_type);
- status = nfserr_inval;
- goto out;
- }
- /*
- * nfsd4_process_open2() does the actual opening of the file. If
- * successful, it (1) truncates the file if open->op_truncate was
- * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
- */
- status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
- out:
- if (open->op_stateowner) {
- nfs4_get_stateowner(open->op_stateowner);
- cstate->replay_owner = open->op_stateowner;
- }
- nfs4_unlock_state();
- return status;
- }
- /*
- * filehandle-manipulating ops.
- */
- static __be32
- nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct svc_fh **getfh)
- {
- if (!cstate->current_fh.fh_dentry)
- return nfserr_nofilehandle;
- *getfh = &cstate->current_fh;
- return nfs_ok;
- }
- static __be32
- nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_putfh *putfh)
- {
- fh_put(&cstate->current_fh);
- cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
- memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
- putfh->pf_fhlen);
- return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
- }
- static __be32
- nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- void *arg)
- {
- __be32 status;
- fh_put(&cstate->current_fh);
- status = exp_pseudoroot(rqstp->rq_client, &cstate->current_fh,
- &rqstp->rq_chandle);
- return status;
- }
- static __be32
- nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- void *arg)
- {
- if (!cstate->save_fh.fh_dentry)
- return nfserr_restorefh;
- fh_dup2(&cstate->current_fh, &cstate->save_fh);
- return nfs_ok;
- }
- static __be32
- nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- void *arg)
- {
- if (!cstate->current_fh.fh_dentry)
- return nfserr_nofilehandle;
- fh_dup2(&cstate->save_fh, &cstate->current_fh);
- return nfs_ok;
- }
- /*
- * misc nfsv4 ops
- */
- static __be32
- nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_access *access)
- {
- if (access->ac_req_access & ~NFS3_ACCESS_FULL)
- return nfserr_inval;
- access->ac_resp_access = access->ac_req_access;
- return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
- &access->ac_supported);
- }
- static __be32
- nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_commit *commit)
- {
- __be32 status;
- u32 *p = (u32 *)commit->co_verf.data;
- *p++ = nfssvc_boot.tv_sec;
- *p++ = nfssvc_boot.tv_usec;
- status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
- commit->co_count);
- if (status == nfserr_symlink)
- status = nfserr_inval;
- return status;
- }
- static __be32
- nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_create *create)
- {
- struct svc_fh resfh;
- __be32 status;
- dev_t rdev;
- fh_init(&resfh, NFS4_FHSIZE);
- status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, MAY_CREATE);
- if (status == nfserr_symlink)
- status = nfserr_notdir;
- if (status)
- return status;
- switch (create->cr_type) {
- case NF4LNK:
- /* ugh! we have to null-terminate the linktext, or
- * vfs_symlink() will choke. it is always safe to
- * null-terminate by brute force, since at worst we
- * will overwrite the first byte of the create namelen
- * in the XDR buffer, which has already been extracted
- * during XDR decode.
- */
- create->cr_linkname[create->cr_linklen] = 0;
- status = nfsd_symlink(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- create->cr_linkname, create->cr_linklen,
- &resfh, &create->cr_iattr);
- break;
- case NF4BLK:
- rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
- if (MAJOR(rdev) != create->cr_specdata1 ||
- MINOR(rdev) != create->cr_specdata2)
- return nfserr_inval;
- status = nfsd_create(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- &create->cr_iattr, S_IFBLK, rdev, &resfh);
- break;
- case NF4CHR:
- rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
- if (MAJOR(rdev) != create->cr_specdata1 ||
- MINOR(rdev) != create->cr_specdata2)
- return nfserr_inval;
- status = nfsd_create(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- &create->cr_iattr,S_IFCHR, rdev, &resfh);
- break;
- case NF4SOCK:
- status = nfsd_create(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- &create->cr_iattr, S_IFSOCK, 0, &resfh);
- break;
- case NF4FIFO:
- status = nfsd_create(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- &create->cr_iattr, S_IFIFO, 0, &resfh);
- break;
- case NF4DIR:
- create->cr_iattr.ia_valid &= ~ATTR_SIZE;
- status = nfsd_create(rqstp, &cstate->current_fh,
- create->cr_name, create->cr_namelen,
- &create->cr_iattr, S_IFDIR, 0, &resfh);
- break;
- default:
- status = nfserr_badtype;
- }
- if (!status) {
- fh_unlock(&cstate->current_fh);
- set_change_info(&create->cr_cinfo, &cstate->current_fh);
- fh_dup2(&cstate->current_fh, &resfh);
- }
- fh_put(&resfh);
- return status;
- }
- static __be32
- nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_getattr *getattr)
- {
- __be32 status;
- status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
- if (status)
- return status;
- if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
- return nfserr_inval;
- getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
- getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
- getattr->ga_fhp = &cstate->current_fh;
- return nfs_ok;
- }
- static __be32
- nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_link *link)
- {
- __be32 status = nfserr_nofilehandle;
- if (!cstate->save_fh.fh_dentry)
- return status;
- status = nfsd_link(rqstp, &cstate->current_fh,
- link->li_name, link->li_namelen, &cstate->save_fh);
- if (!status)
- set_change_info(&link->li_cinfo, &cstate->current_fh);
- return status;
- }
- static __be32
- nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- void *arg)
- {
- struct svc_fh tmp_fh;
- __be32 ret;
- fh_init(&tmp_fh, NFS4_FHSIZE);
- if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
- &rqstp->rq_chandle)) != 0)
- return ret;
- if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
- fh_put(&tmp_fh);
- return nfserr_noent;
- }
- fh_put(&tmp_fh);
- return nfsd_lookup(rqstp, &cstate->current_fh,
- "..", 2, &cstate->current_fh);
- }
- static __be32
- nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_lookup *lookup)
- {
- return nfsd_lookup(rqstp, &cstate->current_fh,
- lookup->lo_name, lookup->lo_len,
- &cstate->current_fh);
- }
- static __be32
- nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_read *read)
- {
- __be32 status;
- /* no need to check permission - this will be done in nfsd_read() */
- read->rd_filp = NULL;
- if (read->rd_offset >= OFFSET_MAX)
- return nfserr_inval;
- nfs4_lock_state();
- /* check stateid */
- if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
- &read->rd_stateid,
- CHECK_FH | RD_STATE, &read->rd_filp))) {
- dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
- goto out;
- }
- if (read->rd_filp)
- get_file(read->rd_filp);
- status = nfs_ok;
- out:
- nfs4_unlock_state();
- read->rd_rqstp = rqstp;
- read->rd_fhp = &cstate->current_fh;
- return status;
- }
- static __be32
- nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_readdir *readdir)
- {
- u64 cookie = readdir->rd_cookie;
- static const nfs4_verifier zeroverf;
- /* no need to check permission - this will be done in nfsd_readdir() */
- if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
- return nfserr_inval;
- readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
- readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
- if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
- (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
- return nfserr_bad_cookie;
- readdir->rd_rqstp = rqstp;
- readdir->rd_fhp = &cstate->current_fh;
- return nfs_ok;
- }
- static __be32
- nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_readlink *readlink)
- {
- readlink->rl_rqstp = rqstp;
- readlink->rl_fhp = &cstate->current_fh;
- return nfs_ok;
- }
- static __be32
- nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_remove *remove)
- {
- __be32 status;
- if (nfs4_in_grace())
- return nfserr_grace;
- status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
- remove->rm_name, remove->rm_namelen);
- if (status == nfserr_symlink)
- return nfserr_notdir;
- if (!status) {
- fh_unlock(&cstate->current_fh);
- set_change_info(&remove->rm_cinfo, &cstate->current_fh);
- }
- return status;
- }
- static __be32
- nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_rename *rename)
- {
- __be32 status = nfserr_nofilehandle;
- if (!cstate->save_fh.fh_dentry)
- return status;
- if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
- & NFSEXP_NOSUBTREECHECK))
- return nfserr_grace;
- status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
- rename->rn_snamelen, &cstate->current_fh,
- rename->rn_tname, rename->rn_tnamelen);
- /* the underlying filesystem returns different error's than required
- * by NFSv4. both save_fh and current_fh have been verified.. */
- if (status == nfserr_isdir)
- status = nfserr_exist;
- else if ((status == nfserr_notdir) &&
- (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
- S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
- status = nfserr_exist;
- else if (status == nfserr_symlink)
- status = nfserr_notdir;
- if (!status) {
- set_change_info(&rename->rn_sinfo, &cstate->current_fh);
- set_change_info(&rename->rn_tinfo, &cstate->save_fh);
- }
- return status;
- }
- static __be32
- nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_setattr *setattr)
- {
- __be32 status = nfs_ok;
- if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
- nfs4_lock_state();
- status = nfs4_preprocess_stateid_op(&cstate->current_fh,
- &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
- nfs4_unlock_state();
- if (status) {
- dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
- return status;
- }
- }
- status = nfs_ok;
- if (setattr->sa_acl != NULL)
- status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
- setattr->sa_acl);
- if (status)
- return status;
- status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
- 0, (time_t)0);
- return status;
- }
- static __be32
- nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_write *write)
- {
- stateid_t *stateid = &write->wr_stateid;
- struct file *filp = NULL;
- u32 *p;
- __be32 status = nfs_ok;
- /* no need to check permission - this will be done in nfsd_write() */
- if (write->wr_offset >= OFFSET_MAX)
- return nfserr_inval;
- nfs4_lock_state();
- status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
- CHECK_FH | WR_STATE, &filp);
- if (filp)
- get_file(filp);
- nfs4_unlock_state();
- if (status) {
- dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
- return status;
- }
- write->wr_bytes_written = write->wr_buflen;
- write->wr_how_written = write->wr_stable_how;
- p = (u32 *)write->wr_verifier.data;
- *p++ = nfssvc_boot.tv_sec;
- *p++ = nfssvc_boot.tv_usec;
- status = nfsd_write(rqstp, &cstate->current_fh, filp,
- write->wr_offset, rqstp->rq_vec, write->wr_vlen,
- write->wr_buflen, &write->wr_how_written);
- if (filp)
- fput(filp);
- if (status == nfserr_symlink)
- status = nfserr_inval;
- return status;
- }
- /* This routine never returns NFS_OK! If there are no other errors, it
- * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
- * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
- * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
- */
- static __be32
- _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_verify *verify)
- {
- __be32 *buf, *p;
- int count;
- __be32 status;
- status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
- if (status)
- return status;
- if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
- || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
- return nfserr_attrnotsupp;
- if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
- || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
- return nfserr_inval;
- if (verify->ve_attrlen & 3)
- return nfserr_inval;
- /* count in words:
- * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
- */
- count = 4 + (verify->ve_attrlen >> 2);
- buf = kmalloc(count << 2, GFP_KERNEL);
- if (!buf)
- return nfserr_resource;
- status = nfsd4_encode_fattr(&cstate->current_fh,
- cstate->current_fh.fh_export,
- cstate->current_fh.fh_dentry, buf,
- &count, verify->ve_bmval,
- rqstp);
- /* this means that nfsd4_encode_fattr() ran out of space */
- if (status == nfserr_resource && count == 0)
- status = nfserr_not_same;
- if (status)
- goto out_kfree;
- p = buf + 3;
- status = nfserr_not_same;
- if (ntohl(*p++) != verify->ve_attrlen)
- goto out_kfree;
- if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
- status = nfserr_same;
- out_kfree:
- kfree(buf);
- return status;
- }
- static __be32
- nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_verify *verify)
- {
- __be32 status;
- status = _nfsd4_verify(rqstp, cstate, verify);
- return status == nfserr_not_same ? nfs_ok : status;
- }
- static __be32
- nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
- struct nfsd4_verify *verify)
- {
- __be32 status;
- status = _nfsd4_verify(rqstp, cstate, verify);
- return status == nfserr_same ? nfs_ok : status;
- }
- /*
- * NULL call.
- */
- static __be32
- nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
- {
- return nfs_ok;
- }
- static inline void nfsd4_increment_op_stats(u32 opnum)
- {
- if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
- nfsdstats.nfs4_opcount[opnum]++;
- }
- static void cstate_free(struct nfsd4_compound_state *cstate)
- {
- if (cstate == NULL)
- return;
- fh_put(&cstate->current_fh);
- fh_put(&cstate->save_fh);
- BUG_ON(cstate->replay_owner);
- kfree(cstate);
- }
- static struct nfsd4_compound_state *cstate_alloc(void)
- {
- struct nfsd4_compound_state *cstate;
- cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
- if (cstate == NULL)
- return NULL;
- fh_init(&cstate->current_fh, NFS4_FHSIZE);
- fh_init(&cstate->save_fh, NFS4_FHSIZE);
- cstate->replay_owner = NULL;
- return cstate;
- }
- typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
- void *);
- struct nfsd4_operation {
- nfsd4op_func op_func;
- u32 op_flags;
- /* Most ops require a valid current filehandle; a few don't: */
- #define ALLOWED_WITHOUT_FH 1
- /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
- #define ALLOWED_ON_ABSENT_FS 2
- };
- static struct nfsd4_operation nfsd4_ops[];
- /*
- * COMPOUND call.
- */
- static __be32
- nfsd4_proc_compound(struct svc_rqst *rqstp,
- struct nfsd4_compoundargs *args,
- struct nfsd4_compoundres *resp)
- {
- struct nfsd4_op *op;
- struct nfsd4_operation *opdesc;
- struct nfsd4_compound_state *cstate = NULL;
- int slack_bytes;
- __be32 status;
- status = nfserr_resource;
- cstate = cstate_alloc();
- if (cstate == NULL)
- goto out;
- resp->xbuf = &rqstp->rq_res;
- resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
- resp->tagp = resp->p;
- /* reserve space for: taglen, tag, and opcnt */
- resp->p += 2 + XDR_QUADLEN(args->taglen);
- resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
- resp->taglen = args->taglen;
- resp->tag = args->tag;
- resp->opcnt = 0;
- resp->rqstp = rqstp;
- /*
- * According to RFC3010, this takes precedence over all other errors.
- */
- status = nfserr_minor_vers_mismatch;
- if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
- goto out;
- status = nfs_ok;
- while (!status && resp->opcnt < args->opcnt) {
- op = &args->ops[resp->opcnt++];
- dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
- /*
- * The XDR decode routines may have pre-set op->status;
- * for example, if there is a miscellaneous XDR error
- * it will be set to nfserr_bad_xdr.
- */
- if (op->status)
- goto encode_op;
- /* We must be able to encode a successful response to
- * this operation, with enough room left over to encode a
- * failed response to the next operation. If we don't
- * have enough room, fail with ERR_RESOURCE.
- */
- slack_bytes = (char *)resp->end - (char *)resp->p;
- if (slack_bytes < COMPOUND_SLACK_SPACE
- + COMPOUND_ERR_SLACK_SPACE) {
- BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
- op->status = nfserr_resource;
- goto encode_op;
- }
- opdesc = &nfsd4_ops[op->opnum];
- if (!cstate->current_fh.fh_dentry) {
- if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
- op->status = nfserr_nofilehandle;
- goto encode_op;
- }
- } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
- !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
- op->status = nfserr_moved;
- goto encode_op;
- }
- if (opdesc->op_func)
- op->status = opdesc->op_func(rqstp, cstate, &op->u);
- else
- BUG_ON(op->status == nfs_ok);
- encode_op:
- if (op->status == nfserr_replay_me) {
- op->replay = &cstate->replay_owner->so_replay;
- nfsd4_encode_replay(resp, op);
- status = op->status = op->replay->rp_status;
- } else {
- nfsd4_encode_operation(resp, op);
- status = op->status;
- }
- if (cstate->replay_owner) {
- nfs4_put_stateowner(cstate->replay_owner);
- cstate->replay_owner = NULL;
- }
- /* XXX Ugh, we need to get rid of this kind of special case: */
- if (op->opnum == OP_READ && op->u.read.rd_filp)
- fput(op->u.read.rd_filp);
- nfsd4_increment_op_stats(op->opnum);
- }
- out:
- nfsd4_release_compoundargs(args);
- cstate_free(cstate);
- return status;
- }
- static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
- [OP_ACCESS] = {
- .op_func = (nfsd4op_func)nfsd4_access,
- },
- [OP_CLOSE] = {
- .op_func = (nfsd4op_func)nfsd4_close,
- },
- [OP_COMMIT] = {
- .op_func = (nfsd4op_func)nfsd4_commit,
- },
- [OP_CREATE] = {
- .op_func = (nfsd4op_func)nfsd4_create,
- },
- [OP_DELEGRETURN] = {
- .op_func = (nfsd4op_func)nfsd4_delegreturn,
- },
- [OP_GETATTR] = {
- .op_func = (nfsd4op_func)nfsd4_getattr,
- .op_flags = ALLOWED_ON_ABSENT_FS,
- },
- [OP_GETFH] = {
- .op_func = (nfsd4op_func)nfsd4_getfh,
- },
- [OP_LINK] = {
- .op_func = (nfsd4op_func)nfsd4_link,
- },
- [OP_LOCK] = {
- .op_func = (nfsd4op_func)nfsd4_lock,
- },
- [OP_LOCKT] = {
- .op_func = (nfsd4op_func)nfsd4_lockt,
- },
- [OP_LOCKU] = {
- .op_func = (nfsd4op_func)nfsd4_locku,
- },
- [OP_LOOKUP] = {
- .op_func = (nfsd4op_func)nfsd4_lookup,
- },
- [OP_LOOKUPP] = {
- .op_func = (nfsd4op_func)nfsd4_lookupp,
- },
- [OP_NVERIFY] = {
- .op_func = (nfsd4op_func)nfsd4_nverify,
- },
- [OP_OPEN] = {
- .op_func = (nfsd4op_func)nfsd4_open,
- },
- [OP_OPEN_CONFIRM] = {
- .op_func = (nfsd4op_func)nfsd4_open_confirm,
- },
- [OP_OPEN_DOWNGRADE] = {
- .op_func = (nfsd4op_func)nfsd4_open_downgrade,
- },
- [OP_PUTFH] = {
- .op_func = (nfsd4op_func)nfsd4_putfh,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_PUTPUBFH] = {
- /* unsupported; just for future reference: */
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_PUTROOTFH] = {
- .op_func = (nfsd4op_func)nfsd4_putrootfh,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_READ] = {
- .op_func = (nfsd4op_func)nfsd4_read,
- },
- [OP_READDIR] = {
- .op_func = (nfsd4op_func)nfsd4_readdir,
- },
- [OP_READLINK] = {
- .op_func = (nfsd4op_func)nfsd4_readlink,
- },
- [OP_REMOVE] = {
- .op_func = (nfsd4op_func)nfsd4_remove,
- },
- [OP_RENAME] = {
- .op_func = (nfsd4op_func)nfsd4_rename,
- },
- [OP_RENEW] = {
- .op_func = (nfsd4op_func)nfsd4_renew,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_RESTOREFH] = {
- .op_func = (nfsd4op_func)nfsd4_restorefh,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_SAVEFH] = {
- .op_func = (nfsd4op_func)nfsd4_savefh,
- },
- [OP_SETATTR] = {
- .op_func = (nfsd4op_func)nfsd4_setattr,
- },
- [OP_SETCLIENTID] = {
- .op_func = (nfsd4op_func)nfsd4_setclientid,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_SETCLIENTID_CONFIRM] = {
- .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- [OP_VERIFY] = {
- .op_func = (nfsd4op_func)nfsd4_verify,
- },
- [OP_WRITE] = {
- .op_func = (nfsd4op_func)nfsd4_write,
- },
- [OP_RELEASE_LOCKOWNER] = {
- .op_func = (nfsd4op_func)nfsd4_release_lockowner,
- .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
- },
- };
- #define nfs4svc_decode_voidargs NULL
- #define nfs4svc_release_void NULL
- #define nfsd4_voidres nfsd4_voidargs
- #define nfs4svc_release_compound NULL
- struct nfsd4_voidargs { int dummy; };
- #define PROC(name, argt, rest, relt, cache, respsize) \
- { (svc_procfunc) nfsd4_proc_##name, \
- (kxdrproc_t) nfs4svc_decode_##argt##args, \
- (kxdrproc_t) nfs4svc_encode_##rest##res, \
- (kxdrproc_t) nfs4svc_release_##relt, \
- sizeof(struct nfsd4_##argt##args), \
- sizeof(struct nfsd4_##rest##res), \
- 0, \
- cache, \
- respsize, \
- }
- /*
- * TODO: At the present time, the NFSv4 server does not do XID caching
- * of requests. Implementing XID caching would not be a serious problem,
- * although it would require a mild change in interfaces since one
- * doesn't know whether an NFSv4 request is idempotent until after the
- * XDR decode. However, XID caching totally confuses pynfs (Peter
- * Astrand's regression testsuite for NFSv4 servers), which reuses
- * XID's liberally, so I've left it unimplemented until pynfs generates
- * better XID's.
- */
- static struct svc_procedure nfsd_procedures4[2] = {
- PROC(null, void, void, void, RC_NOCACHE, 1),
- PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4)
- };
- struct svc_version nfsd_version4 = {
- .vs_vers = 4,
- .vs_nproc = 2,
- .vs_proc = nfsd_procedures4,
- .vs_dispatch = nfsd_dispatch,
- .vs_xdrsize = NFS4_SVC_XDRSIZE,
- };
- /*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
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