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freebsd/sys/fs/nwfs/nwfs_io.c
Peter Wemm f41325db5f With this commit, I hereby pronounce gensetdefs past its use-by date. 
Replace the a.out emulation of 'struct linker_set' with something
a little more flexible.  <sys/linker_set.h> now provides macros for
accessing elements and completely hides the implementation.

The linker_set.h macros have been on the back burner in various
forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()),
John Polstra (ELF clue) and myself (cleaned up API and the conversion
of the rest of the kernel to use it).

The macros declare a strongly typed set.  They return elements with the
type that you declare the set with, rather than a generic void *.

For ELF, we use the magic ld symbols (__start_<setname> and
__stop_<setname>).  Thanks to Richard Henderson <rth@redhat.com> for the
trick about how to force ld to provide them for kld's.

For a.out, we use the old linker_set struct.

NOTE: the item lists are no longer null terminated.  This is why
the code impact is high in certain areas.

The runtime linker has a new method to find the linker set
boundaries depending on which backend format is in use.

linker sets are still module/kld unfriendly and should never be used
for anything that may be modular one day.

Reviewed by:	eivind
2001-06-13 10:58:39 +00:00

634 lines
16 KiB
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/*
* Copyright (c) 1999, 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/bio.h>
#include <sys/buf.h>
#include <sys/proc.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 <vm/vm.h>
#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 <netncp/ncp.h>
#include <netncp/ncp_conn.h>
#include <netncp/ncp_subr.h>
#include <netncp/ncp_ncp.h>
#include <fs/nwfs/nwfs.h>
#include <fs/nwfs/nwfs_node.h>
#include <fs/nwfs/nwfs_subr.h>
static int nwfs_fastlookup = 1;
SYSCTL_DECL(_vfs_nwfs);
SYSCTL_INT(_vfs_nwfs, OID_AUTO, fastlookup, CTLFLAG_RW, &nwfs_fastlookup, 0, "");
extern int nwfs_pbuf_freecnt;
#define DE_SIZE (sizeof(struct dirent))
#define NWFS_RWCACHE
static int
nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
struct nwmount *nmp = VTONWFS(vp);
int error, count, i;
struct dirent dp;
struct nwnode *np = VTONW(vp);
struct nw_entry_info fattr;
struct vnode *newvp;
struct componentname cn;
ncpfid fid;
np = VTONW(vp);
NCPVNDEBUG("dirname='%s'\n",np->n_name);
if (uio->uio_resid < DE_SIZE || (uio->uio_offset < 0))
return (EINVAL);
error = 0;
count = 0;
i = uio->uio_offset / DE_SIZE; /* offset in directory */
if (i == 0) {
error = ncp_initsearch(vp, uio->uio_procp, cred);
if (error) {
NCPVNDEBUG("cannot initialize search, error=%d",error);
return( error );
}
}
for (; uio->uio_resid >= DE_SIZE; i++) {
bzero((char *) &dp, DE_SIZE);
dp.d_reclen = DE_SIZE;
switch (i) {
case 0: /* `.' */
case 1: /* `..' */
dp.d_fileno = (i == 0) ? np->n_fid.f_id : np->n_parent.f_id;
if (!dp.d_fileno) dp.d_fileno = NWFS_ROOT_INO;
dp.d_namlen = i + 1;
dp.d_name[0] = '.';
dp.d_name[1] = '.';
dp.d_name[i + 1] = '\0';
dp.d_type = DT_DIR;
break;
default:
error = ncp_search_for_file_or_subdir(nmp, &np->n_seq, &fattr, uio->uio_procp, cred);
if (error && error < 0x80) break;
dp.d_fileno = fattr.dirEntNum;
dp.d_type = (fattr.attributes & aDIR) ? DT_DIR : DT_REG;
dp.d_namlen = fattr.nameLen;
bcopy(fattr.entryName, dp.d_name, dp.d_namlen);
dp.d_name[dp.d_namlen] = '\0';
#if 0
if (error && eofflag) {
/* *eofflag = 1;*/
break;
}
#endif
break;
}
if (nwfs_fastlookup && !error && i > 1) {
fid.f_id = fattr.dirEntNum;
fid.f_parent = np->n_fid.f_id;
error = nwfs_nget(vp->v_mount, fid, &fattr, vp, &newvp);
if (!error) {
VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
cn.cn_nameptr = dp.d_name;
cn.cn_namelen = dp.d_namlen;
cache_enter(vp, newvp, &cn);
vput(newvp);
} else
error = 0;
}
if (error >= 0x80) {
error = 0;
break;
}
if ((error = uiomove((caddr_t)&dp, DE_SIZE, uio)))
break;
}
uio->uio_offset = i * DE_SIZE;
return (error);
}
int
nwfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred) {
struct nwmount *nmp = VFSTONWFS(vp->v_mount);
struct nwnode *np = VTONW(vp);
struct proc *p;
struct vattr vattr;
int error, biosize;
if (vp->v_type != VREG && vp->v_type != VDIR) {
printf("%s: vn types other than VREG or VDIR are unsupported !\n",__FUNCTION__);
return EIO;
}
if (uiop->uio_resid == 0) return 0;
if (uiop->uio_offset < 0) return EINVAL;
/* if (uiop->uio_offset + uiop->uio_resid > nmp->nm_maxfilesize)
return (EFBIG);*/
p = uiop->uio_procp;
if (vp->v_type == VDIR) {
error = nwfs_readvdir(vp, uiop, cred);
return error;
}
biosize = NWFSTOCONN(nmp)->buffer_size;
if (np->n_flag & NMODIFIED) {
nwfs_attr_cacheremove(vp);
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error) return (error);
np->n_mtime = vattr.va_mtime.tv_sec;
} else {
error = VOP_GETATTR(vp, &vattr, cred, p);
if (error) return (error);
if (np->n_mtime != vattr.va_mtime.tv_sec) {
error = nwfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
if (error) return (error);
np->n_mtime = vattr.va_mtime.tv_sec;
}
}
error = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop,cred);
return (error);
}
int
nwfs_writevnode(vp, uiop, cred, ioflag)
struct vnode *vp;
struct uio *uiop;
struct ucred *cred;
int ioflag;
{
struct nwmount *nmp = VTONWFS(vp);
struct nwnode *np = VTONW(vp);
struct proc *p;
/* struct vattr vattr;*/
int error = 0;
if (vp->v_type != VREG) {
printf("%s: vn types other than VREG unsupported !\n",__FUNCTION__);
return EIO;
}
NCPVNDEBUG("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 > nmp->nm_maxfilesize)
return (EFBIG);*/
p = uiop->uio_procp;
if (ioflag & (IO_APPEND | IO_SYNC)) {
if (np->n_flag & NMODIFIED) {
nwfs_attr_cacheremove(vp);
error = nwfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
if (error) return (error);
}
if (ioflag & IO_APPEND) {
/* We can relay only on local information about file size,
* because until file is closed NetWare will not return
* the correct size. */
#if notyet
nwfs_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);
}
error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cred);
NCPVNDEBUG("after: ofs=%d,resid=%d\n",(int)uiop->uio_offset, uiop->uio_resid);
if (!error) {
if (uiop->uio_offset > np->n_size) {
np->n_vattr.va_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
nwfs_doio(bp, cr, p)
struct buf *bp;
struct ucred *cr;
struct proc *p;
{
struct uio *uiop;
struct vnode *vp;
struct nwnode *np;
struct nwmount *nmp;
int error = 0;
struct uio uio;
struct iovec io;
vp = bp->b_vp;
np = VTONW(vp);
nmp = VFSTONWFS(vp->v_mount);
uiop = &uio;
uiop->uio_iov = &io;
uiop->uio_iovcnt = 1;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_procp = p;
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 = ncp_read(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
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;
/* case VDIR:
nfsstats.readdir_bios++;
uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
error = nfs_readdirplusrpc(vp, uiop, cr);
if (error == NFSERR_NOTSUPP)
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
}
if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
error = nfs_readdirrpc(vp, uiop, cr);
if (error == 0 && uiop->uio_resid == bp->b_bcount)
bp->b_flags |= B_INVAL;
break;
*/
default:
printf("nwfs_doio: type %x unexpected\n",vp->v_type);
break;
};
if (error) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = 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 = ncp_write(NWFSTOCONN(nmp), &np->n_fh, uiop, cr);
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 /*= np->n_error */= error;
/* np->n_flag |= NWRITEERR;*/
}
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
nwfs_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;
{
#ifndef NWFS_RWCACHE
return vop_stdgetpages(ap);(ap->a_vp, ap->a_m, ap->a_count,
#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 nwmount *nmp;
struct nwnode *np;
vm_page_t *pages;
vp = ap->a_vp;
p = curproc; /* XXX */
cred = curproc->p_ucred; /* XXX */
np = VTONW(vp);
nmp = VFSTONWFS(vp->v_mount);
pages = ap->a_m;
count = ap->a_count;
if (vp->v_object == NULL) {
printf("nwfs_getpages: called with non-merged cache vnode??\n");
return VM_PAGER_ERROR;
}
bp = getpbuf(&nwfs_pbuf_freecnt);
npages = btoc(count);
kva = (vm_offset_t) bp->b_data;
pmap_qenter(kva, pages, npages);
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 = ncp_read(NWFSTOCONN(nmp), &np->n_fh, &uio,cred);
pmap_qremove(kva, npages);
relpbuf(bp, &nwfs_pbuf_freecnt);
if (error && (uio.uio_resid == count)) {
printf("nwfs_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;
m->dirty = 0;
} 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 /* NWFS_RWCACHE */
}
/*
* 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
nwfs_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;
#ifndef NWFS_RWCACHE
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 nwmount *nmp;
struct nwnode *np;
vm_page_t *pages;
p = curproc; /* XXX */
cred = p->p_ucred; /* XXX */
/* VOP_OPEN(vp, FWRITE, cred, p);*/
np = VTONW(vp);
nmp = VFSTONWFS(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;
}
bp = getpbuf(&nwfs_pbuf_freecnt);
kva = (vm_offset_t) bp->b_data;
pmap_qenter(kva, pages, npages);
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;
NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
/* VOP_CLOSE(vp, FWRITE, cred, p);*/
NCPVNDEBUG("paged write done: %d\n", error);
pmap_qremove(kva, npages);
relpbuf(bp, &nwfs_pbuf_freecnt);
if (!error) {
int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
for (i = 0; i < nwritten; i++) {
rtvals[i] = VM_PAGER_OK;
pages[i]->dirty = 0;
}
}
return rtvals[0];
#endif /* NWFS_RWCACHE */
}
/*
* Flush and invalidate all dirty buffers. If another process is already
* doing the flush, just wait for completion.
*/
int
nwfs_vinvalbuf(vp, flags, cred, p, intrflg)
struct vnode *vp;
int flags;
struct ucred *cred;
struct proc *p;
int intrflg;
{
struct nwnode *np = VTONW(vp);
/* struct nwmount *nmp = VTONWFS(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, "nwfsvinv", slptimeo);
error = ncp_chkintr(NWFSTOCONN(VTONWFS(vp)), 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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