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freebsd-skq/sys/fs/smbfs/smbfs_io.c
John Baldwin 7063595315 Grab the process lock around psignal(). 
Noticed by:	tanimura
2001-07-18 19:17:36 +00:00

676 lines
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/*
* Copyright (c) 2000-2001, Boris Popov
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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.
*
* $FreeBSD$
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <vm/vm.h>
#if __FreeBSD_version < 400000
#include <vm/vm_prot.h>
#endif
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vnode_pager.h>
/*
#include <sys/ioccom.h>
*/
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
#include <fs/smbfs/smbfs.h>
#include <fs/smbfs/smbfs_node.h>
#include <fs/smbfs/smbfs_subr.h>
/*#define SMBFS_RWGENERIC*/
extern int smbfs_pbuf_freecnt;
static int smbfs_fastlookup = 1;
SYSCTL_DECL(_vfs_smbfs);
SYSCTL_INT(_vfs_smbfs, OID_AUTO, fastlookup, CTLFLAG_RW, &smbfs_fastlookup, 0, "");
#define DE_SIZE (sizeof(struct dirent))
static int
smbfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred)
{
struct dirent de;
struct componentname cn;
struct smb_cred scred;
struct smbfs_fctx *ctx;
struct vnode *newvp;
struct smbnode *np = VTOSMB(vp);
int error/*, *eofflag = ap->a_eofflag*/;
long offset, limit;
np = VTOSMB(vp);
SMBVDEBUG("dirname='%s'\n", np->n_name);
smb_makescred(&scred, uio->uio_procp, cred);
offset = uio->uio_offset / DE_SIZE; /* offset in the directory */
limit = uio->uio_resid / DE_SIZE;
if (uio->uio_resid < DE_SIZE || uio->uio_offset < 0)
return EINVAL;
while (limit && offset < 2) {
limit--;
bzero((caddr_t)&de, DE_SIZE);
de.d_reclen = DE_SIZE;
de.d_fileno = (offset == 0) ? np->n_ino :
(np->n_parent ? np->n_parent->n_ino : 2);
if (de.d_fileno == 0)
de.d_fileno = 0x7ffffffd + offset;
de.d_namlen = offset + 1;
de.d_name[0] = '.';
de.d_name[1] = '.';
de.d_name[offset + 1] = '\0';
de.d_type = DT_DIR;
error = uiomove((caddr_t)&de, DE_SIZE, uio);
if (error)
return error;
offset++;
uio->uio_offset += DE_SIZE;
}
if (limit == 0)
return 0;
if (offset != np->n_dirofs || np->n_dirseq == NULL) {
SMBVDEBUG("Reopening search %ld:%ld\n", offset, np->n_dirofs);
if (np->n_dirseq) {
smbfs_findclose(np->n_dirseq, &scred);
np->n_dirseq = NULL;
}
np->n_dirofs = 2;
error = smbfs_findopen(np, "*", 1,
SMB_FA_SYSTEM | SMB_FA_HIDDEN | SMB_FA_DIR,
&scred, &ctx);
if (error) {
SMBVDEBUG("can not open search, error = %d", error);
return error;
}
np->n_dirseq = ctx;
} else
ctx = np->n_dirseq;
while (np->n_dirofs < offset) {
error = smbfs_findnext(ctx, offset - np->n_dirofs++, &scred);
if (error) {
smbfs_findclose(np->n_dirseq, &scred);
np->n_dirseq = NULL;
return error == ENOENT ? 0 : error;
}
}
error = 0;
for (; limit; limit--, offset++) {
error = smbfs_findnext(ctx, limit, &scred);
if (error)
break;
np->n_dirofs++;
bzero((caddr_t)&de, DE_SIZE);
de.d_reclen = DE_SIZE;
de.d_fileno = ctx->f_attr.fa_ino;
de.d_type = (ctx->f_attr.fa_attr & SMB_FA_DIR) ? DT_DIR : DT_REG;
de.d_namlen = ctx->f_nmlen;
bcopy(ctx->f_name, de.d_name, de.d_namlen);
de.d_name[de.d_namlen] = '\0';
if (smbfs_fastlookup) {
error = smbfs_nget(vp->v_mount, vp, ctx->f_name,
ctx->f_nmlen, &ctx->f_attr, &newvp);
if (!error) {
cn.cn_nameptr = de.d_name;
cn.cn_namelen = de.d_namlen;
cache_enter(vp, newvp, &cn);
vput(newvp);
}
}
error = uiomove((caddr_t)&de, DE_SIZE, uio);
if (error)
break;
}
if (error == ENOENT)
error = 0;
uio->uio_offset = offset * DE_SIZE;
return error;
}
int
smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
struct smbnode *np = VTOSMB(vp);
struct proc *p;
struct vattr vattr;
struct smb_cred scred;
int error, lks;
if (vp->v_type != VREG && vp->v_type != VDIR) {
SMBFSERR("vn types other than VREG or VDIR are unsupported !\n");
return EIO;
}
if (uiop->uio_resid == 0)
return 0;
if (uiop->uio_offset < 0)
return EINVAL;
/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
return EFBIG;*/
p = uiop->uio_procp;
if (vp->v_type == VDIR) {
lks = LK_EXCLUSIVE;/*lockstatus(&vp->v_lock, p);*/
if (lks == LK_SHARED)
vn_lock(vp, LK_UPGRADE | LK_RETRY, p);
error = smbfs_readvdir(vp, uiop, cred);
if (lks == LK_SHARED)
vn_lock(vp, LK_DOWNGRADE | LK_RETRY, p);
return error;
}
/* biosize = SSTOCN(smp->sm_share)->sc_txmax;*/
if (np->n_flag & NMODIFIED) {
smbfs_attr_cacheremove(vp);
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error)
return error;
np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
} else {
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error)
return error;
if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
error = smbfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
if (error)
return error;
np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
}
}
smb_makescred(&scred, p, cred);
return smb_read(smp->sm_share, np->n_fid, uiop, &scred);
}
int
smbfs_writevnode(struct vnode *vp, struct uio *uiop,
struct ucred *cred, int ioflag)
{
struct smbmount *smp = VTOSMBFS(vp);
struct smbnode *np = VTOSMB(vp);
struct smb_cred scred;
struct proc *p;
int error = 0;
if (vp->v_type != VREG) {
SMBERROR("vn types other than VREG unsupported !\n");
return EIO;
}
SMBVDEBUG("ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
if (uiop->uio_offset < 0)
return EINVAL;
/* if (uiop->uio_offset + uiop->uio_resid > smp->nm_maxfilesize)
return (EFBIG);*/
p = uiop->uio_procp;
if (ioflag & (IO_APPEND | IO_SYNC)) {
if (np->n_flag & NMODIFIED) {
smbfs_attr_cacheremove(vp);
error = smbfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
if (error)
return error;
}
if (ioflag & IO_APPEND) {
#if notyet
/*
* File size can be changed by another client
*/
smbfs_attr_cacheremove(vp);
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error) return (error);
#endif
uiop->uio_offset = np->n_size;
}
}
if (uiop->uio_resid == 0)
return 0;
if (p && uiop->uio_offset + uiop->uio_resid > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
PROC_LOCK(p);
psignal(p, SIGXFSZ);
PROC_UNLOCK(p);
return EFBIG;
}
smb_makescred(&scred, p, cred);
error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
SMBVDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
if (!error) {
if (uiop->uio_offset > np->n_size) {
np->n_size = uiop->uio_offset;
vnode_pager_setsize(vp, np->n_size);
}
}
return error;
}
/*
* Do an I/O operation to/from a cache block.
*/
int
smbfs_doio(struct buf *bp, struct ucred *cr, struct proc *p)
{
struct vnode *vp = bp->b_vp;
struct smbmount *smp = VFSTOSMBFS(vp->v_mount);
struct smbnode *np = VTOSMB(vp);
struct uio uio, *uiop = &uio;
struct iovec io;
struct smb_cred scred;
int error = 0;
uiop->uio_iov = &io;
uiop->uio_iovcnt = 1;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_procp = p;
smb_makescred(&scred, p, cr);
if (bp->b_iocmd == BIO_READ) {
io.iov_len = uiop->uio_resid = bp->b_bcount;
io.iov_base = bp->b_data;
uiop->uio_rw = UIO_READ;
switch (vp->v_type) {
case VREG:
uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
error = smb_read(smp->sm_share, np->n_fid, uiop, &scred);
if (error)
break;
if (uiop->uio_resid) {
int left = uiop->uio_resid;
int nread = bp->b_bcount - left;
if (left > 0)
bzero((char *)bp->b_data + nread, left);
}
break;
default:
printf("smbfs_doio: type %x unexpected\n",vp->v_type);
break;
};
if (error) {
bp->b_error = error;
bp->b_ioflags |= BIO_ERROR;
}
} else { /* write */
if (((bp->b_blkno * DEV_BSIZE) + bp->b_dirtyend) > np->n_size)
bp->b_dirtyend = np->n_size - (bp->b_blkno * DEV_BSIZE);
if (bp->b_dirtyend > bp->b_dirtyoff) {
io.iov_len = uiop->uio_resid = bp->b_dirtyend - bp->b_dirtyoff;
uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
uiop->uio_rw = UIO_WRITE;
bp->b_flags |= B_WRITEINPROG;
error = smb_write(smp->sm_share, np->n_fid, uiop, &scred);
bp->b_flags &= ~B_WRITEINPROG;
/*
* For an interrupted write, the buffer is still valid
* and the write hasn't been pushed to the server yet,
* so we can't set BIO_ERROR and report the interruption
* by setting B_EINTR. For the B_ASYNC case, B_EINTR
* is not relevant, so the rpc attempt is essentially
* a noop. For the case of a V3 write rpc not being
* committed to stable storage, the block is still
* dirty and requires either a commit rpc or another
* write rpc with iomode == NFSV3WRITE_FILESYNC before
* the block is reused. This is indicated by setting
* the B_DELWRI and B_NEEDCOMMIT flags.
*/
if (error == EINTR
|| (!error && (bp->b_flags & B_NEEDCOMMIT))) {
int s;
s = splbio();
bp->b_flags &= ~(B_INVAL|B_NOCACHE);
if ((bp->b_flags & B_ASYNC) == 0)
bp->b_flags |= B_EINTR;
if ((bp->b_flags & B_PAGING) == 0) {
bdirty(bp);
bp->b_flags &= ~B_DONE;
}
if ((bp->b_flags & B_ASYNC) == 0)
bp->b_flags |= B_EINTR;
splx(s);
} else {
if (error) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = error;
}
bp->b_dirtyoff = bp->b_dirtyend = 0;
}
} else {
bp->b_resid = 0;
bufdone(bp);
return 0;
}
}
bp->b_resid = uiop->uio_resid;
bufdone(bp);
return error;
}
/*
* Vnode op for VM getpages.
* Wish wish .... get rid from multiple IO routines
*/
int
smbfs_getpages(ap)
struct vop_getpages_args /* {
struct vnode *a_vp;
vm_page_t *a_m;
int a_count;
int a_reqpage;
vm_ooffset_t a_offset;
} */ *ap;
{
#ifdef SMBFS_RWGENERIC
return vop_stdgetpages(ap);
#else
int i, error, nextoff, size, toff, npages, count;
struct uio uio;
struct iovec iov;
vm_offset_t kva;
struct buf *bp;
struct vnode *vp;
struct proc *p;
struct ucred *cred;
struct smbmount *smp;
struct smbnode *np;
struct smb_cred scred;
vm_page_t *pages;
vp = ap->a_vp;
p = curproc; /* XXX */
cred = curproc->p_ucred; /* XXX */
np = VTOSMB(vp);
smp = VFSTOSMBFS(vp->v_mount);
pages = ap->a_m;
count = ap->a_count;
if (vp->v_object == NULL) {
printf("smbfs_getpages: called with non-merged cache vnode??\n");
return VM_PAGER_ERROR;
}
smb_makescred(&scred, p, cred);
#if __FreeBSD_version >= 400000
bp = getpbuf(&smbfs_pbuf_freecnt);
#else
bp = getpbuf();
#endif
npages = btoc(count);
kva = (vm_offset_t) bp->b_data;
pmap_qenter(kva, pages, npages);
cnt.v_vnodein++;
cnt.v_vnodepgsin += count;
iov.iov_base = (caddr_t) kva;
iov.iov_len = count;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
uio.uio_resid = count;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_procp = p;
error = smb_read(smp->sm_share, np->n_fid, &uio, &scred);
pmap_qremove(kva, npages);
#if __FreeBSD_version >= 400000
relpbuf(bp, &smbfs_pbuf_freecnt);
#else
relpbuf(bp);
#endif
if (error && (uio.uio_resid == count)) {
printf("smbfs_getpages: error %d\n",error);
for (i = 0; i < npages; i++) {
if (ap->a_reqpage != i)
vm_page_free(pages[i]);
}
return VM_PAGER_ERROR;
}
size = count - uio.uio_resid;
for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
vm_page_t m;
nextoff = toff + PAGE_SIZE;
m = pages[i];
m->flags &= ~PG_ZERO;
if (nextoff <= size) {
m->valid = VM_PAGE_BITS_ALL;
vm_page_undirty(m);
} else {
int nvalid = ((size + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
vm_page_set_validclean(m, 0, nvalid);
}
if (i != ap->a_reqpage) {
/*
* Whether or not to leave the page activated is up in
* the air, but we should put the page on a page queue
* somewhere (it already is in the object). Result:
* It appears that emperical results show that
* deactivating pages is best.
*/
/*
* Just in case someone was asking for this page we
* now tell them that it is ok to use.
*/
if (!error) {
if (m->flags & PG_WANTED)
vm_page_activate(m);
else
vm_page_deactivate(m);
vm_page_wakeup(m);
} else {
vm_page_free(m);
}
}
}
return 0;
#endif /* SMBFS_RWGENERIC */
}
/*
* Vnode op for VM putpages.
* possible bug: all IO done in sync mode
* Note that vop_close always invalidate pages before close, so it's
* not necessary to open vnode.
*/
int
smbfs_putpages(ap)
struct vop_putpages_args /* {
struct vnode *a_vp;
vm_page_t *a_m;
int a_count;
int a_sync;
int *a_rtvals;
vm_ooffset_t a_offset;
} */ *ap;
{
int error;
struct vnode *vp = ap->a_vp;
struct proc *p;
struct ucred *cred;
#ifdef SMBFS_RWGENERIC
p = curproc; /* XXX */
cred = p->p_ucred; /* XXX */
VOP_OPEN(vp, FWRITE, cred, p);
error = vop_stdputpages(ap);
VOP_CLOSE(vp, FWRITE, cred, p);
return error;
#else
struct uio uio;
struct iovec iov;
vm_offset_t kva;
struct buf *bp;
int i, npages, count;
int *rtvals;
struct smbmount *smp;
struct smbnode *np;
struct smb_cred scred;
vm_page_t *pages;
p = curproc; /* XXX */
cred = p->p_ucred; /* XXX */
/* VOP_OPEN(vp, FWRITE, cred, p);*/
np = VTOSMB(vp);
smp = VFSTOSMBFS(vp->v_mount);
pages = ap->a_m;
count = ap->a_count;
rtvals = ap->a_rtvals;
npages = btoc(count);
for (i = 0; i < npages; i++) {
rtvals[i] = VM_PAGER_AGAIN;
}
#if __FreeBSD_version >= 400000
bp = getpbuf(&smbfs_pbuf_freecnt);
#else
bp = getpbuf();
#endif
kva = (vm_offset_t) bp->b_data;
pmap_qenter(kva, pages, npages);
cnt.v_vnodeout++;
cnt.v_vnodepgsout += count;
iov.iov_base = (caddr_t) kva;
iov.iov_len = count;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
uio.uio_resid = count;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_WRITE;
uio.uio_procp = p;
SMBVDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
smb_makescred(&scred, p, cred);
error = smb_write(smp->sm_share, np->n_fid, &uio, &scred);
/* VOP_CLOSE(vp, FWRITE, cred, p);*/
SMBVDEBUG("paged write done: %d\n", error);
pmap_qremove(kva, npages);
#if __FreeBSD_version >= 400000
relpbuf(bp, &smbfs_pbuf_freecnt);
#else
relpbuf(bp);
#endif
if (!error) {
int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
for (i = 0; i < nwritten; i++) {
rtvals[i] = VM_PAGER_OK;
vm_page_undirty(pages[i]);
}
}
return rtvals[0];
#endif /* SMBFS_RWGENERIC */
}
/*
* Flush and invalidate all dirty buffers. If another process is already
* doing the flush, just wait for completion.
*/
int
smbfs_vinvalbuf(vp, flags, cred, p, intrflg)
struct vnode *vp;
int flags;
struct ucred *cred;
struct proc *p;
int intrflg;
{
struct smbnode *np = VTOSMB(vp);
int error = 0, slpflag, slptimeo;
if (vp->v_flag & VXLOCK)
return 0;
if (intrflg) {
slpflag = PCATCH;
slptimeo = 2 * hz;
} else {
slpflag = 0;
slptimeo = 0;
}
while (np->n_flag & NFLUSHINPROG) {
np->n_flag |= NFLUSHWANT;
error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "smfsvinv", slptimeo);
error = smb_proc_intr(p);
if (error == EINTR && intrflg)
return EINTR;
}
np->n_flag |= NFLUSHINPROG;
error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
while (error) {
if (intrflg && (error == ERESTART || error == EINTR)) {
np->n_flag &= ~NFLUSHINPROG;
if (np->n_flag & NFLUSHWANT) {
np->n_flag &= ~NFLUSHWANT;
wakeup((caddr_t)&np->n_flag);
}
return EINTR;
}
error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
}
np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
if (np->n_flag & NFLUSHWANT) {
np->n_flag &= ~NFLUSHWANT;
wakeup((caddr_t)&np->n_flag);
}
return (error);
}
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