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Diffstat (limited to 'sys/nfs/nfs_bio.c')
| -rw-r--r-- | sys/nfs/nfs_bio.c | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/sys/nfs/nfs_bio.c b/sys/nfs/nfs_bio.c new file mode 100644 index 00000000000..fd4d2b7fad9 --- /dev/null +++ b/sys/nfs/nfs_bio.c @@ -0,0 +1,826 @@ +/* $NetBSD: nfs_bio.c,v 1.21 1995/07/24 21:20:46 cgd Exp $ */ + +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Rick Macklem at The University of Guelph. + * + * 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 the University of + * California, Berkeley and its contributors. + * 4. 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 BY THE REGENTS 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 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. + * + * @(#)nfs_bio.c 8.5 (Berkeley) 1/4/94 + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/resourcevar.h> +#include <sys/proc.h> +#include <sys/buf.h> +#include <sys/vnode.h> +#include <sys/trace.h> +#include <sys/mount.h> +#include <sys/kernel.h> + +#include <vm/vm.h> + +#include <nfs/nfsnode.h> +#include <nfs/rpcv2.h> +#include <nfs/nfsv2.h> +#include <nfs/nfs.h> +#include <nfs/nfsmount.h> +#include <nfs/nqnfs.h> + +struct buf *incore(), *nfs_getcacheblk(); +extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; +extern int nfs_numasync; + +/* + * Vnode op for read using bio + * Any similarity to readip() is purely coincidental + */ +nfs_bioread(vp, uio, ioflag, cred) + register struct vnode *vp; + register struct uio *uio; + int ioflag; + struct ucred *cred; +{ + register struct nfsnode *np = VTONFS(vp); + register int biosize, diff; + struct buf *bp, *rabp; + struct vattr vattr; + struct proc *p; + struct nfsmount *nmp; + daddr_t lbn, bn, rabn; + caddr_t baddr; + int got_buf, nra, error = 0, n, on, not_readin; + +#ifdef lint + ioflag = ioflag; +#endif /* lint */ +#ifdef DIAGNOSTIC + if (uio->uio_rw != UIO_READ) + panic("nfs_read mode"); +#endif + if (uio->uio_resid == 0) + return (0); + if (uio->uio_offset < 0 && vp->v_type != VDIR) + return (EINVAL); + nmp = VFSTONFS(vp->v_mount); + biosize = nmp->nm_rsize; + p = uio->uio_procp; + /* + * For nfs, cache consistency can only be maintained approximately. + * Although RFC1094 does not specify the criteria, the following is + * believed to be compatible with the reference port. + * For nqnfs, full cache consistency is maintained within the loop. + * For nfs: + * If the file's modify time on the server has changed since the + * last read rpc or you have written to the file, + * you may have lost data cache consistency with the + * server, so flush all of the file's data out of the cache. + * Then force a getattr rpc to ensure that you have up to date + * attributes. + * The mount flag NFSMNT_MYWRITE says "Assume that my writes are + * the ones changing the modify time. + * NB: This implies that cache data can be read when up to + * NFS_ATTRTIMEO seconds out of date. If you find that you need current + * attributes this could be forced by setting n_attrstamp to 0 before + * the VOP_GETATTR() call. + */ + if ((nmp->nm_flag & NFSMNT_NQNFS) == 0 && vp->v_type != VLNK) { + if (np->n_flag & NMODIFIED) { + if ((nmp->nm_flag & NFSMNT_MYWRITE) == 0 || + vp->v_type != VREG) { + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + } + np->n_attrstamp = 0; + np->n_direofoffset = 0; + if (error = VOP_GETATTR(vp, &vattr, cred, p)) + return (error); + np->n_mtime = vattr.va_mtime.ts_sec; + } else { + if (error = VOP_GETATTR(vp, &vattr, cred, p)) + return (error); + if (np->n_mtime != vattr.va_mtime.ts_sec) { + np->n_direofoffset = 0; + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + np->n_mtime = vattr.va_mtime.ts_sec; + } + } + } + do { + + /* + * Get a valid lease. If cached data is stale, flush it. + */ + if (nmp->nm_flag & NFSMNT_NQNFS) { + if (NQNFS_CKINVALID(vp, np, NQL_READ)) { + do { + error = nqnfs_getlease(vp, NQL_READ, cred, p); + } while (error == NQNFS_EXPIRED); + if (error) + return (error); + if (np->n_lrev != np->n_brev || + (np->n_flag & NQNFSNONCACHE) || + ((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) { + if (vp->v_type == VDIR) { + np->n_direofoffset = 0; + cache_purge(vp); + } + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + np->n_brev = np->n_lrev; + } + } else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) { + np->n_direofoffset = 0; + cache_purge(vp); + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + } + } + if (np->n_flag & NQNFSNONCACHE) { + switch (vp->v_type) { + case VREG: + error = nfs_readrpc(vp, uio, cred); + break; + case VLNK: + error = nfs_readlinkrpc(vp, uio, cred); + break; + case VDIR: + error = nfs_readdirrpc(vp, uio, cred); + break; + }; + return (error); + } + baddr = (caddr_t)0; + switch (vp->v_type) { + case VREG: + nfsstats.biocache_reads++; + lbn = uio->uio_offset / biosize; + on = uio->uio_offset & (biosize-1); + bn = lbn * (biosize / DEV_BSIZE); + not_readin = 1; + + /* + * Start the read ahead(s), as required. + */ + if (nfs_numasync > 0 && nmp->nm_readahead > 0 && + lbn == vp->v_lastr + 1) { + for (nra = 0; nra < nmp->nm_readahead && + (lbn + 1 + nra) * biosize < np->n_size; nra++) { + rabn = (lbn + 1 + nra) * (biosize / DEV_BSIZE); + if (!incore(vp, rabn)) { + rabp = nfs_getcacheblk(vp, rabn, biosize, p); + if (!rabp) + return (EINTR); + if ((rabp->b_flags & (B_DELWRI | B_DONE)) == 0) { + rabp->b_flags |= (B_READ | B_ASYNC); + if (nfs_asyncio(rabp, cred)) { + rabp->b_flags |= B_INVAL; + brelse(rabp); + } + } else + brelse(rabp); + } + } + } + + /* + * If the block is in the cache and has the required data + * in a valid region, just copy it out. + * Otherwise, get the block and write back/read in, + * as required. + */ + if ((bp = incore(vp, bn)) && + (bp->b_flags & (B_BUSY | B_WRITEINPROG)) == + (B_BUSY | B_WRITEINPROG)) + got_buf = 0; + else { +again: + bp = nfs_getcacheblk(vp, bn, biosize, p); + if (!bp) + return (EINTR); + got_buf = 1; + if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) { + bp->b_flags |= B_READ; + not_readin = 0; + if (error = nfs_doio(bp, cred, p)) { + brelse(bp); + return (error); + } + } + } + n = min((unsigned)(biosize - on), uio->uio_resid); + diff = np->n_size - uio->uio_offset; + if (diff < n) + n = diff; + if (not_readin && n > 0) { + if (on < bp->b_validoff || (on + n) > bp->b_validend) { + if (!got_buf) { + bp = nfs_getcacheblk(vp, bn, biosize, p); + if (!bp) + return (EINTR); + got_buf = 1; + } + bp->b_flags |= B_INVAL; + if (bp->b_dirtyend > 0) { + if ((bp->b_flags & B_DELWRI) == 0) + panic("nfsbioread"); + if (VOP_BWRITE(bp) == EINTR) + return (EINTR); + } else + brelse(bp); + goto again; + } + } + vp->v_lastr = lbn; + diff = (on >= bp->b_validend) ? 0 : (bp->b_validend - on); + if (diff < n) + n = diff; + break; + case VLNK: + nfsstats.biocache_readlinks++; + bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p); + if (!bp) + return (EINTR); + if ((bp->b_flags & B_DONE) == 0) { + bp->b_flags |= B_READ; + if (error = nfs_doio(bp, cred, p)) { + brelse(bp); + return (error); + } + } + n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); + got_buf = 1; + on = 0; + break; + case VDIR: + if (uio->uio_resid < NFS_DIRBLKSIZ) + return (0); + nfsstats.biocache_readdirs++; + bn = (daddr_t)uio->uio_offset; + bp = nfs_getcacheblk(vp, bn, NFS_DIRBLKSIZ, p); + if (!bp) + return (EINTR); + if ((bp->b_flags & B_DONE) == 0) { + bp->b_flags |= B_READ; + if (error = nfs_doio(bp, cred, p)) { + brelse(bp); + return (error); + } + } + + /* + * If not eof and read aheads are enabled, start one. + * (You need the current block first, so that you have the + * directory offset cookie of the next block. + */ + rabn = bp->b_blkno; + if (nfs_numasync > 0 && nmp->nm_readahead > 0 && + rabn != 0 && rabn != np->n_direofoffset && + !incore(vp, rabn)) { + rabp = nfs_getcacheblk(vp, rabn, NFS_DIRBLKSIZ, p); + if (rabp) { + if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) { + rabp->b_flags |= (B_READ | B_ASYNC); + if (nfs_asyncio(rabp, cred)) { + rabp->b_flags |= B_INVAL; + brelse(rabp); + } + } else + brelse(rabp); + } + } + on = 0; + n = min(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid); + got_buf = 1; + break; + }; + + if (n > 0) { + if (!baddr) + baddr = bp->b_data; + error = uiomove(baddr + on, (int)n, uio); + } + switch (vp->v_type) { + case VLNK: + n = 0; + break; + case VDIR: + uio->uio_offset = bp->b_blkno; + break; + }; + if (got_buf) + brelse(bp); + } while (error == 0 && uio->uio_resid > 0 && n > 0); + return (error); +} + +/* + * Vnode op for write using bio + */ +nfs_write(ap) + struct vop_write_args /* { + struct vnode *a_vp; + struct uio *a_uio; + int a_ioflag; + struct ucred *a_cred; + } */ *ap; +{ + register int biosize; + register struct uio *uio = ap->a_uio; + struct proc *p = uio->uio_procp; + register struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + register struct ucred *cred = ap->a_cred; + int ioflag = ap->a_ioflag; + struct buf *bp; + struct vattr vattr; + struct nfsmount *nmp; + daddr_t lbn, bn; + int n, on, error = 0; + +#ifdef DIAGNOSTIC + if (uio->uio_rw != UIO_WRITE) + panic("nfs_write mode"); + if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) + panic("nfs_write proc"); +#endif + if (vp->v_type != VREG) + return (EIO); + if (np->n_flag & NWRITEERR) { + np->n_flag &= ~NWRITEERR; + return (np->n_error); + } + if (ioflag & (IO_APPEND | IO_SYNC)) { + if (np->n_flag & NMODIFIED) { + np->n_attrstamp = 0; + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + } + if (ioflag & IO_APPEND) { + np->n_attrstamp = 0; + if (error = VOP_GETATTR(vp, &vattr, cred, p)) + return (error); + uio->uio_offset = np->n_size; + } + } + nmp = VFSTONFS(vp->v_mount); + if (uio->uio_offset < 0) + return (EINVAL); + if (uio->uio_resid == 0) + return (0); + /* + * Maybe this should be above the vnode op call, but so long as + * file servers have no limits, i don't think it matters + */ + if (p && uio->uio_offset + uio->uio_resid > + p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { + psignal(p, SIGXFSZ); + return (EFBIG); + } + /* + * I use nm_rsize, not nm_wsize so that all buffer cache blocks + * will be the same size within a filesystem. nfs_writerpc will + * still use nm_wsize when sizing the rpc's. + */ + biosize = nmp->nm_rsize; + do { + + /* + * XXX make sure we aren't cached in the VM page cache + */ + (void)vnode_pager_uncache(vp); + + /* + * Check for a valid write lease. + * If non-cachable, just do the rpc + */ + if ((nmp->nm_flag & NFSMNT_NQNFS) && + NQNFS_CKINVALID(vp, np, NQL_WRITE)) { + do { + error = nqnfs_getlease(vp, NQL_WRITE, cred, p); + } while (error == NQNFS_EXPIRED); + if (error) + return (error); + if (np->n_lrev != np->n_brev || + (np->n_flag & NQNFSNONCACHE)) { + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + np->n_brev = np->n_lrev; + } + } + if (np->n_flag & NQNFSNONCACHE) + return (nfs_writerpc(vp, uio, cred, ioflag)); + nfsstats.biocache_writes++; + lbn = uio->uio_offset / biosize; + on = uio->uio_offset & (biosize-1); + n = min((unsigned)(biosize - on), uio->uio_resid); + bn = lbn * (biosize / DEV_BSIZE); +again: + bp = nfs_getcacheblk(vp, bn, biosize, p); + if (!bp) + return (EINTR); + if (bp->b_wcred == NOCRED) { + crhold(cred); + bp->b_wcred = cred; + } + np->n_flag |= NMODIFIED; + if (uio->uio_offset + n > np->n_size) { + np->n_size = uio->uio_offset + n; + vnode_pager_setsize(vp, (u_long)np->n_size); + } + + /* + * If the new write will leave a contiguous dirty + * area, just update the b_dirtyoff and b_dirtyend, + * otherwise force a write rpc of the old dirty area. + */ + if (bp->b_dirtyend > 0 && + (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) { + bp->b_proc = p; + if (VOP_BWRITE(bp) == EINTR) + return (EINTR); + goto again; + } + + /* + * Check for valid write lease and get one as required. + * In case getblk() and/or bwrite() delayed us. + */ + if ((nmp->nm_flag & NFSMNT_NQNFS) && + NQNFS_CKINVALID(vp, np, NQL_WRITE)) { + do { + error = nqnfs_getlease(vp, NQL_WRITE, cred, p); + } while (error == NQNFS_EXPIRED); + if (error) { + brelse(bp); + return (error); + } + if (np->n_lrev != np->n_brev || + (np->n_flag & NQNFSNONCACHE)) { + brelse(bp); + if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1)) + return (error); + np->n_brev = np->n_lrev; + goto again; + } + } + if (error = uiomove((char *)bp->b_data + on, n, uio)) { + bp->b_flags |= B_ERROR; + brelse(bp); + return (error); + } + if (bp->b_dirtyend > 0) { + bp->b_dirtyoff = min(on, bp->b_dirtyoff); + bp->b_dirtyend = max((on + n), bp->b_dirtyend); + } else { + bp->b_dirtyoff = on; + bp->b_dirtyend = on + n; + } +#ifndef notdef + if (bp->b_validend == 0 || bp->b_validend < bp->b_dirtyoff || + bp->b_validoff > bp->b_dirtyend) { + bp->b_validoff = bp->b_dirtyoff; + bp->b_validend = bp->b_dirtyend; + } else { + bp->b_validoff = min(bp->b_validoff, bp->b_dirtyoff); + bp->b_validend = max(bp->b_validend, bp->b_dirtyend); + } +#else + bp->b_validoff = bp->b_dirtyoff; + bp->b_validend = bp->b_dirtyend; +#endif + if (ioflag & IO_APPEND) + bp->b_flags |= B_APPENDWRITE; + + /* + * If the lease is non-cachable or IO_SYNC do bwrite(). + */ + if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) { + bp->b_proc = p; + if (error = VOP_BWRITE(bp)) + return (error); + } else if ((n + on) == biosize && + (nmp->nm_flag & NFSMNT_NQNFS) == 0) { + bp->b_proc = (struct proc *)0; + bawrite(bp); + } else + bdwrite(bp); + } while (uio->uio_resid > 0 && n > 0); + return (0); +} + +/* + * Get an nfs cache block. + * Allocate a new one if the block isn't currently in the cache + * and return the block marked busy. If the calling process is + * interrupted by a signal for an interruptible mount point, return + * NULL. + */ +struct buf * +nfs_getcacheblk(vp, bn, size, p) + struct vnode *vp; + daddr_t bn; + int size; + struct proc *p; +{ + register struct buf *bp; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + + if (nmp->nm_flag & NFSMNT_INT) { + bp = getblk(vp, bn, size, PCATCH, 0); + while (bp == (struct buf *)0) { + if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) + return ((struct buf *)0); + bp = getblk(vp, bn, size, 0, 2 * hz); + } + } else + bp = getblk(vp, bn, size, 0, 0); + return (bp); +} + +/* + * Flush and invalidate all dirty buffers. If another process is already + * doing the flush, just wait for completion. + */ +nfs_vinvalbuf(vp, flags, cred, p, intrflg) + struct vnode *vp; + int flags; + struct ucred *cred; + struct proc *p; + int intrflg; +{ + register struct nfsnode *np = VTONFS(vp); + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + int error = 0, slpflag, slptimeo; + + if ((nmp->nm_flag & NFSMNT_INT) == 0) + intrflg = 0; + if (intrflg) { + slpflag = PCATCH; + slptimeo = 2 * hz; + } else { + slpflag = 0; + slptimeo = 0; + } + /* + * First wait for any other process doing a flush to complete. + */ + while (np->n_flag & NFLUSHINPROG) { + np->n_flag |= NFLUSHWANT; + error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "nfsvinval", + slptimeo); + if (error && intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p)) + return (EINTR); + } + + /* + * Now, flush as required. + */ + np->n_flag |= NFLUSHINPROG; + error = vinvalbuf(vp, flags, cred, p, slpflag, 0); + while (error) { + if (intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p)) { + 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, 0, slptimeo); + } + np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); + if (np->n_flag & NFLUSHWANT) { + np->n_flag &= ~NFLUSHWANT; + wakeup((caddr_t)&np->n_flag); + } + return (0); +} + +/* + * Initiate asynchronous I/O. Return an error if no nfsiods are available. + * This is mainly to avoid queueing async I/O requests when the nfsiods + * are all hung on a dead server. + */ +nfs_asyncio(bp, cred) + register struct buf *bp; + struct ucred *cred; +{ + register int i; + + if (nfs_numasync == 0) + return (EIO); + for (i = 0; i < NFS_MAXASYNCDAEMON; i++) + if (nfs_iodwant[i]) { + if (bp->b_flags & B_READ) { + if (bp->b_rcred == NOCRED && cred != NOCRED) { + crhold(cred); + bp->b_rcred = cred; + } + } else { + if (bp->b_wcred == NOCRED && cred != NOCRED) { + crhold(cred); + bp->b_wcred = cred; + } + } + + TAILQ_INSERT_TAIL(&nfs_bufq, bp, b_freelist); + nfs_iodwant[i] = (struct proc *)0; + wakeup((caddr_t)&nfs_iodwant[i]); + return (0); + } + return (EIO); +} + +/* + * Do an I/O operation to/from a cache block. This may be called + * synchronously or from an nfsiod. + */ +int +nfs_doio(bp, cr, p) + register struct buf *bp; + struct cred *cr; + struct proc *p; +{ + register struct uio *uiop; + register struct vnode *vp; + struct nfsnode *np; + struct nfsmount *nmp; + int error, diff, len; + struct uio uio; + struct iovec io; + + vp = bp->b_vp; + np = VTONFS(vp); + nmp = VFSTONFS(vp->v_mount); + uiop = &uio; + uiop->uio_iov = &io; + uiop->uio_iovcnt = 1; + uiop->uio_segflg = UIO_SYSSPACE; + uiop->uio_procp = p; + + /* + * Historically, paging was done with physio, but no more... + */ + if (bp->b_flags & B_PHYS) { + /* + * ...though reading /dev/drum still gets us here. + */ + io.iov_len = uiop->uio_resid = bp->b_bcount; + /* mapping was done by vmapbuf() */ + io.iov_base = bp->b_data; + uiop->uio_offset = bp->b_blkno * DEV_BSIZE; + if (bp->b_flags & B_READ) { + uiop->uio_rw = UIO_READ; + nfsstats.read_physios++; + error = nfs_readrpc(vp, uiop, cr); + } else { + uiop->uio_rw = UIO_WRITE; + nfsstats.write_physios++; + error = nfs_writerpc(vp, uiop, cr, 0); + } + if (error) { + bp->b_flags |= B_ERROR; + bp->b_error = error; + } + } else if (bp->b_flags & B_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 = bp->b_blkno * DEV_BSIZE; + nfsstats.read_bios++; + error = nfs_readrpc(vp, uiop, cr); + if (!error) { + bp->b_validoff = 0; + if (uiop->uio_resid) { + /* + * If len > 0, there is a hole in the file and + * no writes after the hole have been pushed to + * the server yet. + * Just zero fill the rest of the valid area. + */ + diff = bp->b_bcount - uiop->uio_resid; + len = np->n_size - (bp->b_blkno * DEV_BSIZE + + diff); + if (len > 0) { + len = min(len, uiop->uio_resid); + bzero((char *)bp->b_data + diff, len); + bp->b_validend = diff + len; + } else + bp->b_validend = diff; + } else + bp->b_validend = bp->b_bcount; + } + if (p && (vp->v_flag & VTEXT) && + (((nmp->nm_flag & NFSMNT_NQNFS) && + NQNFS_CKINVALID(vp, np, NQL_READ) && + np->n_lrev != np->n_brev) || + (!(nmp->nm_flag & NFSMNT_NQNFS) && + np->n_mtime != np->n_vattr.va_mtime.ts_sec))) { + uprintf("Process killed due to text file modification\n"); + psignal(p, SIGKILL); + p->p_holdcnt++; + } + break; + case VLNK: + uiop->uio_offset = 0; + nfsstats.readlink_bios++; + error = nfs_readlinkrpc(vp, uiop, cr); + break; + case VDIR: + uiop->uio_offset = bp->b_lblkno; + nfsstats.readdir_bios++; + if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) + error = nfs_readdirlookrpc(vp, uiop, cr); + else + error = nfs_readdirrpc(vp, uiop, cr); + /* + * Save offset cookie in b_blkno. + */ + bp->b_blkno = uiop->uio_offset; + break; + }; + if (error) { + bp->b_flags |= B_ERROR; + bp->b_error = error; + } + } else { + io.iov_len = uiop->uio_resid = bp->b_dirtyend + - bp->b_dirtyoff; + uiop->uio_offset = (bp->b_blkno * DEV_BSIZE) + + bp->b_dirtyoff; + io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; + uiop->uio_rw = UIO_WRITE; + nfsstats.write_bios++; + if (bp->b_flags & B_APPENDWRITE) + error = nfs_writerpc(vp, uiop, cr, IO_APPEND); + else + error = nfs_writerpc(vp, uiop, cr, 0); + bp->b_flags &= ~(B_WRITEINPROG | B_APPENDWRITE); + + /* + * 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 + * B_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. + */ + if (error == EINTR) { + bp->b_flags &= ~B_INVAL; + bp->b_flags |= B_DELWRI; + + /* + * Since for the B_ASYNC case, nfs_bwrite() has reassigned the + * buffer to the clean list, we have to reassign it back to the + * dirty one. Ugh. + */ + if (bp->b_flags & B_ASYNC) + reassignbuf(bp, vp); + else + bp->b_flags |= B_EINTR; + } else { + if (error) { + bp->b_flags |= B_ERROR; + bp->b_error = np->n_error = error; + np->n_flag |= NWRITEERR; + } + bp->b_dirtyoff = bp->b_dirtyend = 0; + } + } + bp->b_resid = uiop->uio_resid; + biodone(bp); + return (error); +} |