446 lines
12 KiB
C
446 lines
12 KiB
C
/* $NetBSD: smbfs_io.c,v 1.16 2003/10/25 08:39:05 christos Exp $ */
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/*
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* Copyright (c) 2000-2001, Boris Popov
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* All rights reserved.
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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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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Boris Popov.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* FreeBSD: src/sys/fs/smbfs/smbfs_io.c,v 1.7 2001/12/02 08:56:58 bp Exp
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: smbfs_io.c,v 1.16 2003/10/25 08:39:05 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/fcntl.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/dirent.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/vmmeter.h>
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#ifndef __NetBSD__
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#include <vm/vm.h>
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#if __FreeBSD_version < 400000
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#include <vm/vm_prot.h>
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#endif
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <vm/vnode_pager.h>
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#else /* __NetBSD__ */
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#include <uvm/uvm.h>
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#include <uvm/uvm_extern.h>
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#endif /* __NetBSD__ */
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/*
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#include <sys/ioccom.h>
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*/
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#include <netsmb/smb.h>
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#include <netsmb/smb_conn.h>
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#include <netsmb/smb_subr.h>
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#include <fs/smbfs/smbfs.h>
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#include <fs/smbfs/smbfs_node.h>
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#include <fs/smbfs/smbfs_subr.h>
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/*#define SMBFS_RWGENERIC*/
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#define DE_SIZE (sizeof(struct dirent))
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static int
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smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
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{
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struct dirent de;
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struct smb_cred scred;
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struct smbfs_fctx *ctx;
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struct smbnode *np = VTOSMB(vp);
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int error = 0/*, *eofflag = ap->a_eofflag*/;
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long offset, limit;
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KASSERT(vp->v_type == VDIR);
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if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0)
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return EINVAL;
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SMBVDEBUG("dirname='%.*s'\n", (int) np->n_nmlen, np->n_name);
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smb_makescred(&scred, uio->uio_procp, cred);
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offset = uio->uio_offset / DE_SIZE; /* offset in the directory */
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limit = uio->uio_resid / DE_SIZE;
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/* Simulate . */
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if (offset < 1) {
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memset(&de, 0, sizeof(de));
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de.d_fileno = np->n_ino;
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de.d_reclen = DE_SIZE;
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de.d_type = DT_DIR;
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de.d_namlen = 1;
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strncpy(de.d_name, ".", 2);
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error = uiomove((caddr_t)&de, sizeof(struct dirent), uio);
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if (error)
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return error;
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limit--;
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offset++;
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}
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/* Simulate .. */
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if (limit > 0 && offset < 2) {
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memset(&de, 0, sizeof(de));
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de.d_fileno = (np->n_parent ? np->n_parent->n_ino : 2);
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de.d_reclen = DE_SIZE;
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de.d_type = DT_DIR;
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de.d_namlen = 2;
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strncpy(de.d_name, "..", 3);
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error = uiomove((caddr_t)&de, sizeof(struct dirent), uio);
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if (error)
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return error;
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limit--;
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offset++;
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}
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if (limit == 0)
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return (0);
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if (offset != np->n_dirofs || np->n_dirseq == NULL) {
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SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
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if (np->n_dirseq) {
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smbfs_findclose(np->n_dirseq, &scred);
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np->n_dirseq = NULL;
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}
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np->n_dirofs = 2;
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error = smbfs_findopen(np, "*", 1,
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SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
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&scred, &ctx);
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if (error) {
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SMBVDEBUG("can not open search, error = %d", error);
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return error;
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}
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np->n_dirseq = ctx;
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} else
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ctx = np->n_dirseq;
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/* skip entries before offset */
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while (np->n_dirofs < offset) {
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error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred);
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if (error) {
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smbfs_findclose(np->n_dirseq, &scred);
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np->n_dirseq = NULL;
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return (error == ENOENT) ? 0 : error;
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}
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}
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for (; limit; limit--, offset++) {
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error = smbfs_findnext(ctx, limit, &scred);
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if (error) {
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if (error == ENOENT)
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error = 0;
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break;
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}
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np->n_dirofs++;
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memset(&de, 0, DE_SIZE);
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de.d_reclen = DE_SIZE;
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de.d_fileno = ctx->f_attr.fa_ino;
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de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG;
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de.d_namlen = ctx->f_nmlen;
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memcpy(de.d_name, ctx->f_name, de.d_namlen);
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de.d_name[de.d_namlen] = '\0';
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error = uiomove((caddr_t)&de, DE_SIZE, uio);
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if (error)
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break;
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}
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return (error);
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}
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int
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smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
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{
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struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
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struct smbnode *np = VTOSMB(vp);
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struct proc *p;
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struct vattr vattr;
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struct smb_cred scred;
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int error;
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KASSERT(vp->v_type == VREG || vp->v_type == VDIR);
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if (uiop->uio_resid == 0)
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return 0;
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if (uiop->uio_offset < 0)
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return EINVAL;
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/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
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return EFBIG;*/
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if (vp->v_type == VDIR) {
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error = smbfs_readvdir(vp, uiop, cred);
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return error;
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}
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p = uiop->uio_procp;
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if (np->n_flag & NMODIFIED) {
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smbfs_attr_cacheremove(vp);
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error = VOP_GETATTR(vp, &vattr, cred, p);
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if (error)
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return error;
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np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
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} else {
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error = VOP_GETATTR(vp, &vattr, cred, p);
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if (error)
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return error;
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if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
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error = smbfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return error;
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np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
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}
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}
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smb_makescred(&scred, p, cred);
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return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
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}
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int
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smbfs_writevnode(struct vnode *vp, struct uio *uiop,
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struct ucred *cred, int ioflag)
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{
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struct smbmount *smp = VTOSMBFS(vp);
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struct smbnode *np = VTOSMB(vp);
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struct smb_cred scred;
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struct proc *p;
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int error = 0;
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int extended = 0;
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size_t resid = uiop->uio_resid;
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/* vn types other than VREG unsupported */
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KASSERT(vp->v_type == VREG);
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SMBVDEBUG("ofs=%lld,resid=%d\n",
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(long long int) uiop->uio_offset,
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uiop->uio_resid);
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if (uiop->uio_offset < 0)
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return EINVAL;
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/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
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return (EFBIG);*/
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p = uiop->uio_procp;
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if (ioflag & (IO_APPEND | IO_SYNC)) {
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if (np->n_flag & NMODIFIED) {
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smbfs_attr_cacheremove(vp);
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error = smbfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
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if (error)
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return error;
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}
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if (ioflag & IO_APPEND) {
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#if notyet
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/*
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* File size can be changed by another client
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*/
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smbfs_attr_cacheremove(vp);
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error = VOP_GETATTR(vp, &vattr, cred, td);
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if (error)
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return (error);
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#endif
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uiop->uio_offset = np->n_size;
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}
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}
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if (uiop->uio_resid == 0)
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return 0;
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if (p && uiop->uio_offset + uiop->uio_resid > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
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psignal(p, SIGXFSZ);
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return EFBIG;
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}
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smb_makescred(&scred, p, cred);
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error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
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SMBVDEBUG("after: ofs=%lld,resid=%d,err=%d\n",(long long int)uiop->uio_offset, uiop->uio_resid, error);
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if (!error) {
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if (uiop->uio_offset > np->n_size) {
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np->n_size = uiop->uio_offset;
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uvm_vnp_setsize(vp, np->n_size);
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extended = 1;
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}
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}
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if (resid > uiop->uio_resid)
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VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
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return error;
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}
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/*
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* Do an I/O operation to/from a cache block.
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*/
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int
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smbfs_doio(struct buf *bp, struct ucred *cr, struct proc *p)
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{
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struct vnode *vp = bp->b_vp;
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struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
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struct smbnode *np = VTOSMB(vp);
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struct uio uio, *uiop = &uio;
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struct iovec io;
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struct smb_cred scred;
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int error = 0;
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uiop->uio_iov = &io;
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uiop->uio_iovcnt = 1;
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uiop->uio_segflg = UIO_SYSSPACE;
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uiop->uio_procp = p;
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smb_makescred(&scred, p, cr);
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if (bp->b_flags == B_READ) {
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io.iov_len = uiop->uio_resid = bp->b_bcount;
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io.iov_base = bp->b_data;
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uiop->uio_rw = UIO_READ;
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switch (vp->v_type) {
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case VREG:
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uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
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error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
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if (error)
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break;
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if (uiop->uio_resid) {
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int left = uiop->uio_resid;
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int nread = bp->b_bcount - left;
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if (left > 0)
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bzero((char *)bp->b_data + nread, left);
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}
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break;
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default:
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printf("smbfs_doio: type %x unexpected\n",vp->v_type);
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break;
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};
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if (error) {
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bp->b_error = error;
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bp->b_flags |= B_ERROR;
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}
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} else { /* write */
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io.iov_len = uiop->uio_resid = bp->b_bcount;
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uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT;
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io.iov_base = bp->b_data;
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uiop->uio_rw = UIO_WRITE;
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bp->b_flags |= B_BUSY;
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error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
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bp->b_flags &= ~B_BUSY;
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#ifndef __NetBSD__ /* XXX */
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/*
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* For an interrupted write, the buffer is still valid
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* and the write hasn't been pushed to the server yet,
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* so we can't set BIO_ERROR and report the interruption
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* by setting B_EINTR. For the B_ASYNC case, B_EINTR
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* is not relevant, so the rpc attempt is essentially
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* a noop. For the case of a V3 write rpc not being
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* committed to stable storage, the block is still
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* dirty and requires either a commit rpc or another
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* write rpc with iomode == NFSV3WRITE_FILESYNC before
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* the block is reused. This is indicated by setting
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* the B_DELWRI and B_NEEDCOMMIT flags.
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*/
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if (error == EINTR
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|| (!error && (bp->b_flags & B_NEEDCOMMIT))) {
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int s;
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s = splbio();
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bp->b_flags &= ~(B_INVAL|B_NOCACHE);
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if ((bp->b_flags & B_ASYNC) == 0)
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bp->b_flags |= B_EINTR;
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if ((bp->b_flags & B_PAGING) == 0) {
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bdirty(bp);
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bp->b_flags &= ~B_DONE;
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}
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if ((bp->b_flags & B_ASYNC) == 0)
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bp->b_flags |= B_EINTR;
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splx(s);
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} else {
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if (error) {
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bp->b_ioflags |= BIO_ERROR;
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bp->b_error = error;
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}
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bp->b_dirtyoff = bp->b_dirtyend = 0;
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}
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#endif /* !__NetBSD__ */
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}
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bp->b_resid = uiop->uio_resid;
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biodone(bp);
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return error;
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}
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/*
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* Flush and invalidate all dirty buffers. If another process is already
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* doing the flush, just wait for completion.
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*/
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int
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smbfs_vinvalbuf(vp, flags, cred, p, intrflg)
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struct vnode *vp;
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int flags;
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struct ucred *cred;
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struct proc *p;
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int intrflg;
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{
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struct smbnode *np = VTOSMB(vp);
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int error = 0, slpflag;
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if (intrflg)
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slpflag = PCATCH;
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else
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slpflag = 0;
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while (np->n_flag & NFLUSHINPROG) {
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np->n_flag |= NFLUSHWANT;
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error = tsleep((caddr_t)&np->n_flag,
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(PRIBIO + 2) | slpflag, "smfsvinv", 0);
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if (error)
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return (error);
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}
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np->n_flag |= NFLUSHINPROG;
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for(;;) {
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if ((error = vinvalbuf(vp, flags, cred, p, slpflag, 0)) == 0)
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break;
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if (intrflg && (error == ERESTART || error == EINTR)) {
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np->n_flag &= ~NFLUSHINPROG;
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if (np->n_flag & NFLUSHWANT) {
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np->n_flag &= ~NFLUSHWANT;
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wakeup((caddr_t)&np->n_flag);
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}
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return (error);
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}
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}
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np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
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if (np->n_flag & NFLUSHWANT) {
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np->n_flag &= ~NFLUSHWANT;
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wakeup((caddr_t)&np->n_flag);
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}
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return (error);
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}
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