/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. * * Copyright (c) 1983,1984,1985,1986,1987,1988,1989 AT&T. * All rights reserved. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int nfs_rdwrlbn(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *); static int nfswrite(vnode_t *, caddr_t, uint_t, int, cred_t *); static int nfsread(vnode_t *, caddr_t, uint_t, int, size_t *, cred_t *); static int nfssetattr(vnode_t *, struct vattr *, int, cred_t *); static int nfslookup_dnlc(vnode_t *, char *, vnode_t **, cred_t *); static int nfslookup_otw(vnode_t *, char *, vnode_t **, cred_t *, int); static int nfsrename(vnode_t *, char *, vnode_t *, char *, cred_t *, caller_context_t *); static int nfsreaddir(vnode_t *, rddir_cache *, cred_t *); static int nfs_bio(struct buf *, cred_t *); static int nfs_getapage(vnode_t *, u_offset_t, size_t, uint_t *, page_t *[], size_t, struct seg *, caddr_t, enum seg_rw, cred_t *); static void nfs_readahead(vnode_t *, u_offset_t, caddr_t, struct seg *, cred_t *); static int nfs_sync_putapage(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *); static int nfs_sync_pageio(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *); static void nfs_delmap_callback(struct as *, void *, uint_t); /* * Error flags used to pass information about certain special errors * which need to be handled specially. */ #define NFS_EOF -98 /* * These are the vnode ops routines which implement the vnode interface to * the networked file system. These routines just take their parameters, * make them look networkish by putting the right info into interface structs, * and then calling the appropriate remote routine(s) to do the work. * * Note on directory name lookup cacheing: If we detect a stale fhandle, * we purge the directory cache relative to that vnode. This way, the * user won't get burned by the cache repeatedly. See for * more details on rnode locking. */ static int nfs_open(vnode_t **, int, cred_t *, caller_context_t *); static int nfs_close(vnode_t *, int, int, offset_t, cred_t *, caller_context_t *); static int nfs_read(vnode_t *, struct uio *, int, cred_t *, caller_context_t *); static int nfs_write(vnode_t *, struct uio *, int, cred_t *, caller_context_t *); static int nfs_ioctl(vnode_t *, int, intptr_t, int, cred_t *, int *, caller_context_t *); static int nfs_getattr(vnode_t *, struct vattr *, int, cred_t *, caller_context_t *); static int nfs_setattr(vnode_t *, struct vattr *, int, cred_t *, caller_context_t *); static int nfs_access(vnode_t *, int, int, cred_t *, caller_context_t *); static int nfs_accessx(void *, int, cred_t *); static int nfs_readlink(vnode_t *, struct uio *, cred_t *, caller_context_t *); static int nfs_fsync(vnode_t *, int, cred_t *, caller_context_t *); static void nfs_inactive(vnode_t *, cred_t *, caller_context_t *); static int nfs_lookup(vnode_t *, char *, vnode_t **, struct pathname *, int, vnode_t *, cred_t *, caller_context_t *, int *, pathname_t *); static int nfs_create(vnode_t *, char *, struct vattr *, enum vcexcl, int, vnode_t **, cred_t *, int, caller_context_t *, vsecattr_t *); static int nfs_remove(vnode_t *, char *, cred_t *, caller_context_t *, int); static int nfs_link(vnode_t *, vnode_t *, char *, cred_t *, caller_context_t *, int); static int nfs_rename(vnode_t *, char *, vnode_t *, char *, cred_t *, caller_context_t *, int); static int nfs_mkdir(vnode_t *, char *, struct vattr *, vnode_t **, cred_t *, caller_context_t *, int, vsecattr_t *); static int nfs_rmdir(vnode_t *, char *, vnode_t *, cred_t *, caller_context_t *, int); static int nfs_symlink(vnode_t *, char *, struct vattr *, char *, cred_t *, caller_context_t *, int); static int nfs_readdir(vnode_t *, struct uio *, cred_t *, int *, caller_context_t *, int); static int nfs_fid(vnode_t *, fid_t *, caller_context_t *); static int nfs_rwlock(vnode_t *, int, caller_context_t *); static void nfs_rwunlock(vnode_t *, int, caller_context_t *); static int nfs_seek(vnode_t *, offset_t, offset_t *, caller_context_t *); static int nfs_getpage(vnode_t *, offset_t, size_t, uint_t *, page_t *[], size_t, struct seg *, caddr_t, enum seg_rw, cred_t *, caller_context_t *); static int nfs_putpage(vnode_t *, offset_t, size_t, int, cred_t *, caller_context_t *); static int nfs_map(vnode_t *, offset_t, struct as *, caddr_t *, size_t, uchar_t, uchar_t, uint_t, cred_t *, caller_context_t *); static int nfs_addmap(vnode_t *, offset_t, struct as *, caddr_t, size_t, uchar_t, uchar_t, uint_t, cred_t *, caller_context_t *); static int nfs_frlock(vnode_t *, int, struct flock64 *, int, offset_t, struct flk_callback *, cred_t *, caller_context_t *); static int nfs_space(vnode_t *, int, struct flock64 *, int, offset_t, cred_t *, caller_context_t *); static int nfs_realvp(vnode_t *, vnode_t **, caller_context_t *); static int nfs_delmap(vnode_t *, offset_t, struct as *, caddr_t, size_t, uint_t, uint_t, uint_t, cred_t *, caller_context_t *); static int nfs_pathconf(vnode_t *, int, ulong_t *, cred_t *, caller_context_t *); static int nfs_pageio(vnode_t *, page_t *, u_offset_t, size_t, int, cred_t *, caller_context_t *); static int nfs_setsecattr(vnode_t *, vsecattr_t *, int, cred_t *, caller_context_t *); static int nfs_getsecattr(vnode_t *, vsecattr_t *, int, cred_t *, caller_context_t *); static int nfs_shrlock(vnode_t *, int, struct shrlock *, int, cred_t *, caller_context_t *); struct vnodeops *nfs_vnodeops; const fs_operation_def_t nfs_vnodeops_template[] = { VOPNAME_OPEN, { .vop_open = nfs_open }, VOPNAME_CLOSE, { .vop_close = nfs_close }, VOPNAME_READ, { .vop_read = nfs_read }, VOPNAME_WRITE, { .vop_write = nfs_write }, VOPNAME_IOCTL, { .vop_ioctl = nfs_ioctl }, VOPNAME_GETATTR, { .vop_getattr = nfs_getattr }, VOPNAME_SETATTR, { .vop_setattr = nfs_setattr }, VOPNAME_ACCESS, { .vop_access = nfs_access }, VOPNAME_LOOKUP, { .vop_lookup = nfs_lookup }, VOPNAME_CREATE, { .vop_create = nfs_create }, VOPNAME_REMOVE, { .vop_remove = nfs_remove }, VOPNAME_LINK, { .vop_link = nfs_link }, VOPNAME_RENAME, { .vop_rename = nfs_rename }, VOPNAME_MKDIR, { .vop_mkdir = nfs_mkdir }, VOPNAME_RMDIR, { .vop_rmdir = nfs_rmdir }, VOPNAME_READDIR, { .vop_readdir = nfs_readdir }, VOPNAME_SYMLINK, { .vop_symlink = nfs_symlink }, VOPNAME_READLINK, { .vop_readlink = nfs_readlink }, VOPNAME_FSYNC, { .vop_fsync = nfs_fsync }, VOPNAME_INACTIVE, { .vop_inactive = nfs_inactive }, VOPNAME_FID, { .vop_fid = nfs_fid }, VOPNAME_RWLOCK, { .vop_rwlock = nfs_rwlock }, VOPNAME_RWUNLOCK, { .vop_rwunlock = nfs_rwunlock }, VOPNAME_SEEK, { .vop_seek = nfs_seek }, VOPNAME_FRLOCK, { .vop_frlock = nfs_frlock }, VOPNAME_SPACE, { .vop_space = nfs_space }, VOPNAME_REALVP, { .vop_realvp = nfs_realvp }, VOPNAME_GETPAGE, { .vop_getpage = nfs_getpage }, VOPNAME_PUTPAGE, { .vop_putpage = nfs_putpage }, VOPNAME_MAP, { .vop_map = nfs_map }, VOPNAME_ADDMAP, { .vop_addmap = nfs_addmap }, VOPNAME_DELMAP, { .vop_delmap = nfs_delmap }, VOPNAME_DUMP, { .vop_dump = nfs_dump }, VOPNAME_PATHCONF, { .vop_pathconf = nfs_pathconf }, VOPNAME_PAGEIO, { .vop_pageio = nfs_pageio }, VOPNAME_SETSECATTR, { .vop_setsecattr = nfs_setsecattr }, VOPNAME_GETSECATTR, { .vop_getsecattr = nfs_getsecattr }, VOPNAME_SHRLOCK, { .vop_shrlock = nfs_shrlock }, VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, NULL, NULL }; /* * XXX: This is referenced in modstubs.s */ struct vnodeops * nfs_getvnodeops(void) { return (nfs_vnodeops); } /* ARGSUSED */ static int nfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct) { int error; struct vattr va; rnode_t *rp; vnode_t *vp; vp = *vpp; rp = VTOR(vp); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); mutex_enter(&rp->r_statelock); if (rp->r_cred == NULL) { crhold(cr); rp->r_cred = cr; } mutex_exit(&rp->r_statelock); /* * If there is no cached data or if close-to-open * consistency checking is turned off, we can avoid * the over the wire getattr. Otherwise, if the * file system is mounted readonly, then just verify * the caches are up to date using the normal mechanism. * Else, if the file is not mmap'd, then just mark * the attributes as timed out. They will be refreshed * and the caches validated prior to being used. * Else, the file system is mounted writeable so * force an over the wire GETATTR in order to ensure * that all cached data is valid. */ if (vp->v_count > 1 || ((vn_has_cached_data(vp) || HAVE_RDDIR_CACHE(rp)) && !(VTOMI(vp)->mi_flags & MI_NOCTO))) { if (vn_is_readonly(vp)) error = nfs_validate_caches(vp, cr); else if (rp->r_mapcnt == 0 && vp->v_count == 1) { PURGE_ATTRCACHE(vp); error = 0; } else { va.va_mask = AT_ALL; error = nfs_getattr_otw(vp, &va, cr); } } else error = 0; return (error); } /* ARGSUSED */ static int nfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr, caller_context_t *ct) { rnode_t *rp; int error; struct vattr va; /* * zone_enter(2) prevents processes from changing zones with NFS files * open; if we happen to get here from the wrong zone we can't do * anything over the wire. */ if (VTOMI(vp)->mi_zone != nfs_zone()) { /* * We could attempt to clean up locks, except we're sure * that the current process didn't acquire any locks on * the file: any attempt to lock a file belong to another zone * will fail, and one can't lock an NFS file and then change * zones, as that fails too. * * Returning an error here is the sane thing to do. A * subsequent call to VN_RELE() which translates to a * nfs_inactive() will clean up state: if the zone of the * vnode's origin is still alive and kicking, an async worker * thread will handle the request (from the correct zone), and * everything (minus the final nfs_getattr_otw() call) should * be OK. If the zone is going away nfs_async_inactive() will * throw away cached pages inline. */ return (EIO); } /* * If we are using local locking for this filesystem, then * release all of the SYSV style record locks. Otherwise, * we are doing network locking and we need to release all * of the network locks. All of the locks held by this * process on this file are released no matter what the * incoming reference count is. */ if (VTOMI(vp)->mi_flags & MI_LLOCK) { cleanlocks(vp, ttoproc(curthread)->p_pid, 0); cleanshares(vp, ttoproc(curthread)->p_pid); } else nfs_lockrelease(vp, flag, offset, cr); if (count > 1) return (0); /* * If the file has been `unlinked', then purge the * DNLC so that this vnode will get reycled quicker * and the .nfs* file on the server will get removed. */ rp = VTOR(vp); if (rp->r_unldvp != NULL) dnlc_purge_vp(vp); /* * If the file was open for write and there are pages, * then if the file system was mounted using the "no-close- * to-open" semantics, then start an asynchronous flush * of the all of the pages in the file. * else the file system was not mounted using the "no-close- * to-open" semantics, then do a synchronous flush and * commit of all of the dirty and uncommitted pages. * * The asynchronous flush of the pages in the "nocto" path * mostly just associates a cred pointer with the rnode so * writes which happen later will have a better chance of * working. It also starts the data being written to the * server, but without unnecessarily delaying the application. */ if ((flag & FWRITE) && vn_has_cached_data(vp)) { if ((VTOMI(vp)->mi_flags & MI_NOCTO)) { error = nfs_putpage(vp, (offset_t)0, 0, B_ASYNC, cr, ct); if (error == EAGAIN) error = 0; } else error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct); if (!error) { mutex_enter(&rp->r_statelock); error = rp->r_error; rp->r_error = 0; mutex_exit(&rp->r_statelock); } } else { mutex_enter(&rp->r_statelock); error = rp->r_error; rp->r_error = 0; mutex_exit(&rp->r_statelock); } /* * If RWRITEATTR is set, then issue an over the wire GETATTR to * refresh the attribute cache with a set of attributes which * weren't returned from a WRITE. This will enable the close- * to-open processing to work. */ if (rp->r_flags & RWRITEATTR) (void) nfs_getattr_otw(vp, &va, cr); return (error); } /* ARGSUSED */ static int nfs_read(vnode_t *vp, struct uio *uiop, int ioflag, cred_t *cr, caller_context_t *ct) { rnode_t *rp; u_offset_t off; offset_t diff; int on; size_t n; caddr_t base; uint_t flags; int error; mntinfo_t *mi; rp = VTOR(vp); mi = VTOMI(vp); if (nfs_zone() != mi->mi_zone) return (EIO); ASSERT(nfs_rw_lock_held(&rp->r_rwlock, RW_READER)); if (vp->v_type != VREG) return (EISDIR); if (uiop->uio_resid == 0) return (0); if (uiop->uio_loffset > MAXOFF32_T) return (EFBIG); if (uiop->uio_loffset < 0 || uiop->uio_loffset + uiop->uio_resid > MAXOFF32_T) return (EINVAL); /* * Bypass VM if caching has been disabled (e.g., locking) or if * using client-side direct I/O and the file is not mmap'd and * there are no cached pages. */ if ((vp->v_flag & VNOCACHE) || (((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO)) && rp->r_mapcnt == 0 && !vn_has_cached_data(vp))) { size_t bufsize; size_t resid = 0; /* * Let's try to do read in as large a chunk as we can * (Filesystem (NFS client) bsize if possible/needed). * For V3, this is 32K and for V2, this is 8K. */ bufsize = MIN(uiop->uio_resid, VTOMI(vp)->mi_curread); base = kmem_alloc(bufsize, KM_SLEEP); do { n = MIN(uiop->uio_resid, bufsize); error = nfsread(vp, base, uiop->uio_offset, n, &resid, cr); if (!error) { n -= resid; error = uiomove(base, n, UIO_READ, uiop); } } while (!error && uiop->uio_resid > 0 && n > 0); kmem_free(base, bufsize); return (error); } error = 0; do { off = uiop->uio_loffset & MAXBMASK; /* mapping offset */ on = uiop->uio_loffset & MAXBOFFSET; /* Relative offset */ n = MIN(MAXBSIZE - on, uiop->uio_resid); error = nfs_validate_caches(vp, cr); if (error) break; mutex_enter(&rp->r_statelock); while (rp->r_flags & RINCACHEPURGE) { if (!cv_wait_sig(&rp->r_cv, &rp->r_statelock)) { mutex_exit(&rp->r_statelock); return (EINTR); } } diff = rp->r_size - uiop->uio_loffset; mutex_exit(&rp->r_statelock); if (diff <= 0) break; if (diff < n) n = (size_t)diff; if (vpm_enable) { /* * Copy data. */ error = vpm_data_copy(vp, off + on, n, uiop, 1, NULL, 0, S_READ); } else { base = segmap_getmapflt(segkmap, vp, off + on, n, 1, S_READ); error = uiomove(base + on, n, UIO_READ, uiop); } if (!error) { /* * If read a whole block or read to eof, * won't need this buffer again soon. */ mutex_enter(&rp->r_statelock); if (n + on == MAXBSIZE || uiop->uio_loffset == rp->r_size) flags = SM_DONTNEED; else flags = 0; mutex_exit(&rp->r_statelock); if (vpm_enable) { error = vpm_sync_pages(vp, off, n, flags); } else { error = segmap_release(segkmap, base, flags); } } else { if (vpm_enable) { (void) vpm_sync_pages(vp, off, n, 0); } else { (void) segmap_release(segkmap, base, 0); } } } while (!error && uiop->uio_resid > 0); return (error); } /* ARGSUSED */ static int nfs_write(vnode_t *vp, struct uio *uiop, int ioflag, cred_t *cr, caller_context_t *ct) { rnode_t *rp; u_offset_t off; caddr_t base; uint_t flags; int remainder; size_t n; int on; int error; int resid; offset_t offset; rlim_t limit; mntinfo_t *mi; rp = VTOR(vp); mi = VTOMI(vp); if (nfs_zone() != mi->mi_zone) return (EIO); if (vp->v_type != VREG) return (EISDIR); if (uiop->uio_resid == 0) return (0); if (ioflag & FAPPEND) { struct vattr va; /* * Must serialize if appending. */ if (nfs_rw_lock_held(&rp->r_rwlock, RW_READER)) { nfs_rw_exit(&rp->r_rwlock); if (nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER, INTR(vp))) return (EINTR); } va.va_mask = AT_SIZE; error = nfsgetattr(vp, &va, cr); if (error) return (error); uiop->uio_loffset = va.va_size; } if (uiop->uio_loffset > MAXOFF32_T) return (EFBIG); offset = uiop->uio_loffset + uiop->uio_resid; if (uiop->uio_loffset < 0 || offset > MAXOFF32_T) return (EINVAL); if (uiop->uio_llimit > (rlim64_t)MAXOFF32_T) { limit = MAXOFF32_T; } else { limit = (rlim_t)uiop->uio_llimit; } /* * Check to make sure that the process will not exceed * its limit on file size. It is okay to write up to * the limit, but not beyond. Thus, the write which * reaches the limit will be short and the next write * will return an error. */ remainder = 0; if (offset > limit) { remainder = offset - limit; uiop->uio_resid = limit - uiop->uio_offset; if (uiop->uio_resid <= 0) { proc_t *p = ttoproc(curthread); uiop->uio_resid += remainder; mutex_enter(&p->p_lock); (void) rctl_action(rctlproc_legacy[RLIMIT_FSIZE], p->p_rctls, p, RCA_UNSAFE_SIGINFO); mutex_exit(&p->p_lock); return (EFBIG); } } if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_READER, INTR(vp))) return (EINTR); /* * Bypass VM if caching has been disabled (e.g., locking) or if * using client-side direct I/O and the file is not mmap'd and * there are no cached pages. */ if ((vp->v_flag & VNOCACHE) || (((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO)) && rp->r_mapcnt == 0 && !vn_has_cached_data(vp))) { size_t bufsize; int count; uint_t org_offset; nfs_fwrite: if (rp->r_flags & RSTALE) { resid = uiop->uio_resid; offset = uiop->uio_loffset; error = rp->r_error; goto bottom; } bufsize = MIN(uiop->uio_resid, mi->mi_curwrite); base = kmem_alloc(bufsize, KM_SLEEP); do { resid = uiop->uio_resid; offset = uiop->uio_loffset; count = MIN(uiop->uio_resid, bufsize); org_offset = uiop->uio_offset; error = uiomove(base, count, UIO_WRITE, uiop); if (!error) { error = nfswrite(vp, base, org_offset, count, cr); } } while (!error && uiop->uio_resid > 0); kmem_free(base, bufsize); goto bottom; } do { off = uiop->uio_loffset & MAXBMASK; /* mapping offset */ on = uiop->uio_loffset & MAXBOFFSET; /* Relative offset */ n = MIN(MAXBSIZE - on, uiop->uio_resid); resid = uiop->uio_resid; offset = uiop->uio_loffset; if (rp->r_flags & RSTALE) { error = rp->r_error; break; } /* * Don't create dirty pages faster than they * can be cleaned so that the system doesn't * get imbalanced. If the async queue is * maxed out, then wait for it to drain before * creating more dirty pages. Also, wait for * any threads doing pagewalks in the vop_getattr * entry points so that they don't block for * long periods. */ mutex_enter(&rp->r_statelock); while ((mi->mi_max_threads != 0 && rp->r_awcount > 2 * mi->mi_max_threads) || rp->r_gcount > 0) cv_wait(&rp->r_cv, &rp->r_statelock); mutex_exit(&rp->r_statelock); if (vpm_enable) { /* * It will use kpm mappings, so no need to * pass an address. */ error = writerp(rp, NULL, n, uiop, 0); } else { if (segmap_kpm) { int pon = uiop->uio_loffset & PAGEOFFSET; size_t pn = MIN(PAGESIZE - pon, uiop->uio_resid); int pagecreate; mutex_enter(&rp->r_statelock); pagecreate = (pon == 0) && (pn == PAGESIZE || uiop->uio_loffset + pn >= rp->r_size); mutex_exit(&rp->r_statelock); base = segmap_getmapflt(segkmap, vp, off + on, pn, !pagecreate, S_WRITE); error = writerp(rp, base + pon, n, uiop, pagecreate); } else { base = segmap_getmapflt(segkmap, vp, off + on, n, 0, S_READ); error = writerp(rp, base + on, n, uiop, 0); } } if (!error) { if (mi->mi_flags & MI_NOAC) flags = SM_WRITE; else if (n + on == MAXBSIZE || IS_SWAPVP(vp)) { /* * Have written a whole block. * Start an asynchronous write * and mark the buffer to * indicate that it won't be * needed again soon. */ flags = SM_WRITE | SM_ASYNC | SM_DONTNEED; } else flags = 0; if ((ioflag & (FSYNC|FDSYNC)) || (rp->r_flags & ROUTOFSPACE)) { flags &= ~SM_ASYNC; flags |= SM_WRITE; } if (vpm_enable) { error = vpm_sync_pages(vp, off, n, flags); } else { error = segmap_release(segkmap, base, flags); } } else { if (vpm_enable) { (void) vpm_sync_pages(vp, off, n, 0); } else { (void) segmap_release(segkmap, base, 0); } /* * In the event that we got an access error while * faulting in a page for a write-only file just * force a write. */ if (error == EACCES) goto nfs_fwrite; } } while (!error && uiop->uio_resid > 0); bottom: if (error) { uiop->uio_resid = resid + remainder; uiop->uio_loffset = offset; } else uiop->uio_resid += remainder; nfs_rw_exit(&rp->r_lkserlock); return (error); } /* * Flags are composed of {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED} */ static int nfs_rdwrlbn(vnode_t *vp, page_t *pp, u_offset_t off, size_t len, int flags, cred_t *cr) { struct buf *bp; int error; ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); bp = pageio_setup(pp, len, vp, flags); ASSERT(bp != NULL); /* * pageio_setup should have set b_addr to 0. This * is correct since we want to do I/O on a page * boundary. bp_mapin will use this addr to calculate * an offset, and then set b_addr to the kernel virtual * address it allocated for us. */ ASSERT(bp->b_un.b_addr == 0); bp->b_edev = 0; bp->b_dev = 0; bp->b_lblkno = lbtodb(off); bp->b_file = vp; bp->b_offset = (offset_t)off; bp_mapin(bp); error = nfs_bio(bp, cr); bp_mapout(bp); pageio_done(bp); return (error); } /* * Write to file. Writes to remote server in largest size * chunks that the server can handle. Write is synchronous. */ static int nfswrite(vnode_t *vp, caddr_t base, uint_t offset, int count, cred_t *cr) { rnode_t *rp; mntinfo_t *mi; struct nfswriteargs wa; struct nfsattrstat ns; int error; int tsize; int douprintf; douprintf = 1; rp = VTOR(vp); mi = VTOMI(vp); ASSERT(nfs_zone() == mi->mi_zone); wa.wa_args = &wa.wa_args_buf; wa.wa_fhandle = *VTOFH(vp); do { tsize = MIN(mi->mi_curwrite, count); wa.wa_data = base; wa.wa_begoff = offset; wa.wa_totcount = tsize; wa.wa_count = tsize; wa.wa_offset = offset; if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } wa.wa_mblk = NULL; do { error = rfs2call(mi, RFS_WRITE, xdr_writeargs, (caddr_t)&wa, xdr_attrstat, (caddr_t)&ns, cr, &douprintf, &ns.ns_status, 0, NULL); } while (error == ENFS_TRYAGAIN); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } if (!error) { error = geterrno(ns.ns_status); /* * Can't check for stale fhandle and purge caches * here because pages are held by nfs_getpage. * Just mark the attribute cache as timed out * and set RWRITEATTR to indicate that the file * was modified with a WRITE operation. */ if (!error) { count -= tsize; base += tsize; offset += tsize; if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); KSTAT_IO_PTR(mi->mi_io_kstats)-> writes++; KSTAT_IO_PTR(mi->mi_io_kstats)-> nwritten += tsize; mutex_exit(&mi->mi_lock); } lwp_stat_update(LWP_STAT_OUBLK, 1); mutex_enter(&rp->r_statelock); PURGE_ATTRCACHE_LOCKED(rp); rp->r_flags |= RWRITEATTR; mutex_exit(&rp->r_statelock); } } } while (!error && count); return (error); } /* * Read from a file. Reads data in largest chunks our interface can handle. */ static int nfsread(vnode_t *vp, caddr_t base, uint_t offset, int count, size_t *residp, cred_t *cr) { mntinfo_t *mi; struct nfsreadargs ra; struct nfsrdresult rr; int tsize; int error; int douprintf; failinfo_t fi; rnode_t *rp; struct vattr va; hrtime_t t; rp = VTOR(vp); mi = VTOMI(vp); ASSERT(nfs_zone() == mi->mi_zone); douprintf = 1; ra.ra_fhandle = *VTOFH(vp); fi.vp = vp; fi.fhp = (caddr_t)&ra.ra_fhandle; fi.copyproc = nfscopyfh; fi.lookupproc = nfslookup; fi.xattrdirproc = acl_getxattrdir2; do { if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } do { tsize = MIN(mi->mi_curread, count); rr.rr_data = base; ra.ra_offset = offset; ra.ra_totcount = tsize; ra.ra_count = tsize; t = gethrtime(); error = rfs2call(mi, RFS_READ, xdr_readargs, (caddr_t)&ra, xdr_rdresult, (caddr_t)&rr, cr, &douprintf, &rr.rr_status, 0, &fi); } while (error == ENFS_TRYAGAIN); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } if (!error) { error = geterrno(rr.rr_status); if (!error) { count -= rr.rr_count; base += rr.rr_count; offset += rr.rr_count; if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); KSTAT_IO_PTR(mi->mi_io_kstats)->reads++; KSTAT_IO_PTR(mi->mi_io_kstats)->nread += rr.rr_count; mutex_exit(&mi->mi_lock); } lwp_stat_update(LWP_STAT_INBLK, 1); } } } while (!error && count && rr.rr_count == tsize); *residp = count; if (!error) { /* * Since no error occurred, we have the current * attributes and we need to do a cache check and then * potentially update the cached attributes. We can't * use the normal attribute check and cache mechanisms * because they might cause a cache flush which would * deadlock. Instead, we just check the cache to see * if the attributes have changed. If it is, then we * just mark the attributes as out of date. The next * time that the attributes are checked, they will be * out of date, new attributes will be fetched, and * the page cache will be flushed. If the attributes * weren't changed, then we just update the cached * attributes with these attributes. */ /* * If NFS_ACL is supported on the server, then the * attributes returned by server may have minimal * permissions sometimes denying access to users having * proper access. To get the proper attributes, mark * the attributes as expired so that they will be * regotten via the NFS_ACL GETATTR2 procedure. */ error = nattr_to_vattr(vp, &rr.rr_attr, &va); mutex_enter(&rp->r_statelock); if (error || !CACHE_VALID(rp, va.va_mtime, va.va_size) || (mi->mi_flags & MI_ACL)) { mutex_exit(&rp->r_statelock); PURGE_ATTRCACHE(vp); } else { if (rp->r_mtime <= t) { nfs_attrcache_va(vp, &va); } mutex_exit(&rp->r_statelock); } } return (error); } /* ARGSUSED */ static int nfs_ioctl(vnode_t *vp, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp, caller_context_t *ct) { if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); switch (cmd) { case _FIODIRECTIO: return (nfs_directio(vp, (int)arg, cr)); default: return (ENOTTY); } } /* ARGSUSED */ static int nfs_getattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr, caller_context_t *ct) { int error; rnode_t *rp; if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* * If it has been specified that the return value will * just be used as a hint, and we are only being asked * for size, fsid or rdevid, then return the client's * notion of these values without checking to make sure * that the attribute cache is up to date. * The whole point is to avoid an over the wire GETATTR * call. */ rp = VTOR(vp); if (flags & ATTR_HINT) { if (vap->va_mask == (vap->va_mask & (AT_SIZE | AT_FSID | AT_RDEV))) { mutex_enter(&rp->r_statelock); if (vap->va_mask | AT_SIZE) vap->va_size = rp->r_size; if (vap->va_mask | AT_FSID) vap->va_fsid = rp->r_attr.va_fsid; if (vap->va_mask | AT_RDEV) vap->va_rdev = rp->r_attr.va_rdev; mutex_exit(&rp->r_statelock); return (0); } } /* * Only need to flush pages if asking for the mtime * and if there any dirty pages or any outstanding * asynchronous (write) requests for this file. */ if (vap->va_mask & AT_MTIME) { if (vn_has_cached_data(vp) && ((rp->r_flags & RDIRTY) || rp->r_awcount > 0)) { mutex_enter(&rp->r_statelock); rp->r_gcount++; mutex_exit(&rp->r_statelock); error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct); mutex_enter(&rp->r_statelock); if (error && (error == ENOSPC || error == EDQUOT)) { if (!rp->r_error) rp->r_error = error; } if (--rp->r_gcount == 0) cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); } } return (nfsgetattr(vp, vap, cr)); } /*ARGSUSED4*/ static int nfs_setattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr, caller_context_t *ct) { int error; uint_t mask; struct vattr va; mask = vap->va_mask; if (mask & AT_NOSET) return (EINVAL); if ((mask & AT_SIZE) && vap->va_type == VREG && vap->va_size > MAXOFF32_T) return (EFBIG); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); va.va_mask = AT_UID | AT_MODE; error = nfsgetattr(vp, &va, cr); if (error) return (error); error = secpolicy_vnode_setattr(cr, vp, vap, &va, flags, nfs_accessx, vp); if (error) return (error); return (nfssetattr(vp, vap, flags, cr)); } static int nfssetattr(vnode_t *vp, struct vattr *vap, int flags, cred_t *cr) { int error; uint_t mask; struct nfssaargs args; struct nfsattrstat ns; int douprintf; rnode_t *rp; struct vattr va; mode_t omode; mntinfo_t *mi; vsecattr_t *vsp; hrtime_t t; mask = vap->va_mask; ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); rp = VTOR(vp); /* * Only need to flush pages if there are any pages and * if the file is marked as dirty in some fashion. The * file must be flushed so that we can accurately * determine the size of the file and the cached data * after the SETATTR returns. A file is considered to * be dirty if it is either marked with RDIRTY, has * outstanding i/o's active, or is mmap'd. In this * last case, we can't tell whether there are dirty * pages, so we flush just to be sure. */ if (vn_has_cached_data(vp) && ((rp->r_flags & RDIRTY) || rp->r_count > 0 || rp->r_mapcnt > 0)) { ASSERT(vp->v_type != VCHR); error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, NULL); if (error && (error == ENOSPC || error == EDQUOT)) { mutex_enter(&rp->r_statelock); if (!rp->r_error) rp->r_error = error; mutex_exit(&rp->r_statelock); } } /* * If the system call was utime(2) or utimes(2) and the * application did not specify the times, then set the * mtime nanosecond field to 1 billion. This will get * translated from 1 billion nanoseconds to 1 million * microseconds in the over the wire request. The * server will use 1 million in the microsecond field * to tell whether both the mtime and atime should be * set to the server's current time. * * This is an overload of the protocol and should be * documented in the NFS Version 2 protocol specification. */ if ((mask & AT_MTIME) && !(flags & ATTR_UTIME)) { vap->va_mtime.tv_nsec = 1000000000; if (NFS_TIME_T_OK(vap->va_mtime.tv_sec) && NFS_TIME_T_OK(vap->va_atime.tv_sec)) { error = vattr_to_sattr(vap, &args.saa_sa); } else { /* * Use server times. vap time values will not be used. * To ensure no time overflow, make sure vap has * valid values, but retain the original values. */ timestruc_t mtime = vap->va_mtime; timestruc_t atime = vap->va_atime; time_t now; now = gethrestime_sec(); if (NFS_TIME_T_OK(now)) { /* Just in case server does not know of this */ vap->va_mtime.tv_sec = now; vap->va_atime.tv_sec = now; } else { vap->va_mtime.tv_sec = 0; vap->va_atime.tv_sec = 0; } error = vattr_to_sattr(vap, &args.saa_sa); /* set vap times back on */ vap->va_mtime = mtime; vap->va_atime = atime; } } else { /* Either do not set times or use the client specified times */ error = vattr_to_sattr(vap, &args.saa_sa); } if (error) { /* req time field(s) overflow - return immediately */ return (error); } args.saa_fh = *VTOFH(vp); va.va_mask = AT_MODE; error = nfsgetattr(vp, &va, cr); if (error) return (error); omode = va.va_mode; mi = VTOMI(vp); douprintf = 1; t = gethrtime(); error = rfs2call(mi, RFS_SETATTR, xdr_saargs, (caddr_t)&args, xdr_attrstat, (caddr_t)&ns, cr, &douprintf, &ns.ns_status, 0, NULL); /* * Purge the access cache and ACL cache if changing either the * owner of the file, the group owner, or the mode. These may * change the access permissions of the file, so purge old * information and start over again. */ if ((mask & (AT_UID | AT_GID | AT_MODE)) && (mi->mi_flags & MI_ACL)) { (void) nfs_access_purge_rp(rp); if (rp->r_secattr != NULL) { mutex_enter(&rp->r_statelock); vsp = rp->r_secattr; rp->r_secattr = NULL; mutex_exit(&rp->r_statelock); if (vsp != NULL) nfs_acl_free(vsp); } } if (!error) { error = geterrno(ns.ns_status); if (!error) { /* * If changing the size of the file, invalidate * any local cached data which is no longer part * of the file. We also possibly invalidate the * last page in the file. We could use * pvn_vpzero(), but this would mark the page as * modified and require it to be written back to * the server for no particularly good reason. * This way, if we access it, then we bring it * back in. A read should be cheaper than a * write. */ if (mask & AT_SIZE) { nfs_invalidate_pages(vp, (vap->va_size & PAGEMASK), cr); } (void) nfs_cache_fattr(vp, &ns.ns_attr, &va, t, cr); /* * If NFS_ACL is supported on the server, then the * attributes returned by server may have minimal * permissions sometimes denying access to users having * proper access. To get the proper attributes, mark * the attributes as expired so that they will be * regotten via the NFS_ACL GETATTR2 procedure. */ if (mi->mi_flags & MI_ACL) { PURGE_ATTRCACHE(vp); } /* * This next check attempts to deal with NFS * servers which can not handle increasing * the size of the file via setattr. Most * of these servers do not return an error, * but do not change the size of the file. * Hence, this check and then attempt to set * the file size by writing 1 byte at the * offset of the end of the file that we need. */ if ((mask & AT_SIZE) && ns.ns_attr.na_size < (uint32_t)vap->va_size) { char zb = '\0'; error = nfswrite(vp, &zb, vap->va_size - sizeof (zb), sizeof (zb), cr); } /* * Some servers will change the mode to clear the setuid * and setgid bits when changing the uid or gid. The * client needs to compensate appropriately. */ if (mask & (AT_UID | AT_GID)) { int terror; va.va_mask = AT_MODE; terror = nfsgetattr(vp, &va, cr); if (!terror && (((mask & AT_MODE) && va.va_mode != vap->va_mode) || (!(mask & AT_MODE) && va.va_mode != omode))) { va.va_mask = AT_MODE; if (mask & AT_MODE) va.va_mode = vap->va_mode; else va.va_mode = omode; (void) nfssetattr(vp, &va, 0, cr); } } } else { PURGE_ATTRCACHE(vp); PURGE_STALE_FH(error, vp, cr); } } else { PURGE_ATTRCACHE(vp); } return (error); } static int nfs_accessx(void *vp, int mode, cred_t *cr) { ASSERT(nfs_zone() == VTOMI((vnode_t *)vp)->mi_zone); return (nfs_access(vp, mode, 0, cr, NULL)); } /* ARGSUSED */ static int nfs_access(vnode_t *vp, int mode, int flags, cred_t *cr, caller_context_t *ct) { struct vattr va; int error; mntinfo_t *mi; int shift = 0; mi = VTOMI(vp); if (nfs_zone() != mi->mi_zone) return (EIO); if (mi->mi_flags & MI_ACL) { error = acl_access2(vp, mode, flags, cr); if (mi->mi_flags & MI_ACL) return (error); } va.va_mask = AT_MODE | AT_UID | AT_GID; error = nfsgetattr(vp, &va, cr); if (error) return (error); /* * Disallow write attempts on read-only * file systems, unless the file is a * device node. */ if ((mode & VWRITE) && vn_is_readonly(vp) && !IS_DEVVP(vp)) return (EROFS); /* * Disallow attempts to access mandatory lock files. */ if ((mode & (VWRITE | VREAD | VEXEC)) && MANDLOCK(vp, va.va_mode)) return (EACCES); /* * Access check is based on only * one of owner, group, public. * If not owner, then check group. * If not a member of the group, * then check public access. */ if (crgetuid(cr) != va.va_uid) { shift += 3; if (!groupmember(va.va_gid, cr)) shift += 3; } found: mode &= ~(va.va_mode << shift); if (mode == 0) return (0); return (secpolicy_vnode_access(cr, vp, va.va_uid, mode)); } static int nfs_do_symlink_cache = 1; /* ARGSUSED */ static int nfs_readlink(vnode_t *vp, struct uio *uiop, cred_t *cr, caller_context_t *ct) { int error; struct nfsrdlnres rl; rnode_t *rp; int douprintf; failinfo_t fi; /* * We want to be consistent with UFS semantics so we will return * EINVAL instead of ENXIO. This violates the XNFS spec and * the RFC 1094, which are wrong any way. BUGID 1138002. */ if (vp->v_type != VLNK) return (EINVAL); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); rp = VTOR(vp); if (nfs_do_symlink_cache && rp->r_symlink.contents != NULL) { error = nfs_validate_caches(vp, cr); if (error) return (error); mutex_enter(&rp->r_statelock); if (rp->r_symlink.contents != NULL) { error = uiomove(rp->r_symlink.contents, rp->r_symlink.len, UIO_READ, uiop); mutex_exit(&rp->r_statelock); return (error); } mutex_exit(&rp->r_statelock); } rl.rl_data = kmem_alloc(NFS_MAXPATHLEN, KM_SLEEP); fi.vp = vp; fi.fhp = NULL; /* no need to update, filehandle not copied */ fi.copyproc = nfscopyfh; fi.lookupproc = nfslookup; fi.xattrdirproc = acl_getxattrdir2; douprintf = 1; error = rfs2call(VTOMI(vp), RFS_READLINK, xdr_fhandle, (caddr_t)VTOFH(vp), xdr_rdlnres, (caddr_t)&rl, cr, &douprintf, &rl.rl_status, 0, &fi); if (error) { kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN); return (error); } error = geterrno(rl.rl_status); if (!error) { error = uiomove(rl.rl_data, (int)rl.rl_count, UIO_READ, uiop); if (nfs_do_symlink_cache && rp->r_symlink.contents == NULL) { mutex_enter(&rp->r_statelock); if (rp->r_symlink.contents == NULL) { rp->r_symlink.contents = rl.rl_data; rp->r_symlink.len = (int)rl.rl_count; rp->r_symlink.size = NFS_MAXPATHLEN; mutex_exit(&rp->r_statelock); } else { mutex_exit(&rp->r_statelock); kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN); } } else { kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN); } } else { PURGE_STALE_FH(error, vp, cr); kmem_free((void *)rl.rl_data, NFS_MAXPATHLEN); } /* * Conform to UFS semantics (see comment above) */ return (error == ENXIO ? EINVAL : error); } /* * Flush local dirty pages to stable storage on the server. * * If FNODSYNC is specified, then there is nothing to do because * metadata changes are not cached on the client before being * sent to the server. */ /* ARGSUSED */ static int nfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct) { int error; if ((syncflag & FNODSYNC) || IS_SWAPVP(vp)) return (0); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct); if (!error) error = VTOR(vp)->r_error; return (error); } /* * Weirdness: if the file was removed or the target of a rename * operation while it was open, it got renamed instead. Here we * remove the renamed file. */ /* ARGSUSED */ static void nfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) { rnode_t *rp; ASSERT(vp != DNLC_NO_VNODE); /* * If this is coming from the wrong zone, we let someone in the right * zone take care of it asynchronously. We can get here due to * VN_RELE() being called from pageout() or fsflush(). This call may * potentially turn into an expensive no-op if, for instance, v_count * gets incremented in the meantime, but it's still correct. */ if (nfs_zone() != VTOMI(vp)->mi_zone) { nfs_async_inactive(vp, cr, nfs_inactive); return; } rp = VTOR(vp); redo: if (rp->r_unldvp != NULL) { /* * Save the vnode pointer for the directory where the * unlinked-open file got renamed, then set it to NULL * to prevent another thread from getting here before * we're done with the remove. While we have the * statelock, make local copies of the pertinent rnode * fields. If we weren't to do this in an atomic way, the * the unl* fields could become inconsistent with respect * to each other due to a race condition between this * code and nfs_remove(). See bug report 1034328. */ mutex_enter(&rp->r_statelock); if (rp->r_unldvp != NULL) { vnode_t *unldvp; char *unlname; cred_t *unlcred; struct nfsdiropargs da; enum nfsstat status; int douprintf; int error; unldvp = rp->r_unldvp; rp->r_unldvp = NULL; unlname = rp->r_unlname; rp->r_unlname = NULL; unlcred = rp->r_unlcred; rp->r_unlcred = NULL; mutex_exit(&rp->r_statelock); /* * If there are any dirty pages left, then flush * them. This is unfortunate because they just * may get thrown away during the remove operation, * but we have to do this for correctness. */ if (vn_has_cached_data(vp) && ((rp->r_flags & RDIRTY) || rp->r_count > 0)) { ASSERT(vp->v_type != VCHR); error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct); if (error) { mutex_enter(&rp->r_statelock); if (!rp->r_error) rp->r_error = error; mutex_exit(&rp->r_statelock); } } /* * Do the remove operation on the renamed file */ setdiropargs(&da, unlname, unldvp); douprintf = 1; (void) rfs2call(VTOMI(unldvp), RFS_REMOVE, xdr_diropargs, (caddr_t)&da, xdr_enum, (caddr_t)&status, unlcred, &douprintf, &status, 0, NULL); if (HAVE_RDDIR_CACHE(VTOR(unldvp))) nfs_purge_rddir_cache(unldvp); PURGE_ATTRCACHE(unldvp); /* * Release stuff held for the remove */ VN_RELE(unldvp); kmem_free(unlname, MAXNAMELEN); crfree(unlcred); goto redo; } mutex_exit(&rp->r_statelock); } rp_addfree(rp, cr); } /* * Remote file system operations having to do with directory manipulation. */ /* ARGSUSED */ static int nfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp, int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, int *direntflags, pathname_t *realpnp) { int error; vnode_t *vp; vnode_t *avp = NULL; rnode_t *drp; if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); drp = VTOR(dvp); /* * Are we looking up extended attributes? If so, "dvp" is * the file or directory for which we want attributes, and * we need a lookup of the hidden attribute directory * before we lookup the rest of the path. */ if (flags & LOOKUP_XATTR) { bool_t cflag = ((flags & CREATE_XATTR_DIR) != 0); mntinfo_t *mi; mi = VTOMI(dvp); if (!(mi->mi_flags & MI_EXTATTR)) return (EINVAL); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_READER, INTR(dvp))) return (EINTR); (void) nfslookup_dnlc(dvp, XATTR_DIR_NAME, &avp, cr); if (avp == NULL) error = acl_getxattrdir2(dvp, &avp, cflag, cr, 0); else error = 0; nfs_rw_exit(&drp->r_rwlock); if (error) { if (mi->mi_flags & MI_EXTATTR) return (error); return (EINVAL); } dvp = avp; drp = VTOR(dvp); } if (nfs_rw_enter_sig(&drp->r_rwlock, RW_READER, INTR(dvp))) { error = EINTR; goto out; } error = nfslookup(dvp, nm, vpp, pnp, flags, rdir, cr, 0); nfs_rw_exit(&drp->r_rwlock); /* * If vnode is a device, create special vnode. */ if (!error && IS_DEVVP(*vpp)) { vp = *vpp; *vpp = specvp(vp, vp->v_rdev, vp->v_type, cr); VN_RELE(vp); } out: if (avp != NULL) VN_RELE(avp); return (error); } static int nfs_lookup_neg_cache = 1; #ifdef DEBUG static int nfs_lookup_dnlc_hits = 0; static int nfs_lookup_dnlc_misses = 0; static int nfs_lookup_dnlc_neg_hits = 0; static int nfs_lookup_dnlc_disappears = 0; static int nfs_lookup_dnlc_lookups = 0; #endif /* ARGSUSED */ int nfslookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp, int flags, vnode_t *rdir, cred_t *cr, int rfscall_flags) { int error; ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone); /* * If lookup is for "", just return dvp. Don't need * to send it over the wire, look it up in the dnlc, * or perform any access checks. */ if (*nm == '\0') { VN_HOLD(dvp); *vpp = dvp; return (0); } /* * Can't do lookups in non-directories. */ if (dvp->v_type != VDIR) return (ENOTDIR); /* * If we're called with RFSCALL_SOFT, it's important that * the only rfscall is one we make directly; if we permit * an access call because we're looking up "." or validating * a dnlc hit, we'll deadlock because that rfscall will not * have the RFSCALL_SOFT set. */ if (rfscall_flags & RFSCALL_SOFT) goto callit; /* * If lookup is for ".", just return dvp. Don't need * to send it over the wire or look it up in the dnlc, * just need to check access. */ if (strcmp(nm, ".") == 0) { error = nfs_access(dvp, VEXEC, 0, cr, NULL); if (error) return (error); VN_HOLD(dvp); *vpp = dvp; return (0); } /* * Lookup this name in the DNLC. If there was a valid entry, * then return the results of the lookup. */ error = nfslookup_dnlc(dvp, nm, vpp, cr); if (error || *vpp != NULL) return (error); callit: error = nfslookup_otw(dvp, nm, vpp, cr, rfscall_flags); return (error); } static int nfslookup_dnlc(vnode_t *dvp, char *nm, vnode_t **vpp, cred_t *cr) { int error; vnode_t *vp; ASSERT(*nm != '\0'); ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone); /* * Lookup this name in the DNLC. If successful, then validate * the caches and then recheck the DNLC. The DNLC is rechecked * just in case this entry got invalidated during the call * to nfs_validate_caches. * * An assumption is being made that it is safe to say that a * file exists which may not on the server. Any operations to * the server will fail with ESTALE. */ #ifdef DEBUG nfs_lookup_dnlc_lookups++; #endif vp = dnlc_lookup(dvp, nm); if (vp != NULL) { VN_RELE(vp); if (vp == DNLC_NO_VNODE && !vn_is_readonly(dvp)) { PURGE_ATTRCACHE(dvp); } error = nfs_validate_caches(dvp, cr); if (error) return (error); vp = dnlc_lookup(dvp, nm); if (vp != NULL) { error = nfs_access(dvp, VEXEC, 0, cr, NULL); if (error) { VN_RELE(vp); return (error); } if (vp == DNLC_NO_VNODE) { VN_RELE(vp); #ifdef DEBUG nfs_lookup_dnlc_neg_hits++; #endif return (ENOENT); } *vpp = vp; #ifdef DEBUG nfs_lookup_dnlc_hits++; #endif return (0); } #ifdef DEBUG nfs_lookup_dnlc_disappears++; #endif } #ifdef DEBUG else nfs_lookup_dnlc_misses++; #endif *vpp = NULL; return (0); } static int nfslookup_otw(vnode_t *dvp, char *nm, vnode_t **vpp, cred_t *cr, int rfscall_flags) { int error; struct nfsdiropargs da; struct nfsdiropres dr; int douprintf; failinfo_t fi; hrtime_t t; ASSERT(*nm != '\0'); ASSERT(dvp->v_type == VDIR); ASSERT(nfs_zone() == VTOMI(dvp)->mi_zone); setdiropargs(&da, nm, dvp); fi.vp = dvp; fi.fhp = NULL; /* no need to update, filehandle not copied */ fi.copyproc = nfscopyfh; fi.lookupproc = nfslookup; fi.xattrdirproc = acl_getxattrdir2; douprintf = 1; t = gethrtime(); error = rfs2call(VTOMI(dvp), RFS_LOOKUP, xdr_diropargs, (caddr_t)&da, xdr_diropres, (caddr_t)&dr, cr, &douprintf, &dr.dr_status, rfscall_flags, &fi); if (!error) { error = geterrno(dr.dr_status); if (!error) { *vpp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr, dvp->v_vfsp, t, cr, VTOR(dvp)->r_path, nm); /* * If NFS_ACL is supported on the server, then the * attributes returned by server may have minimal * permissions sometimes denying access to users having * proper access. To get the proper attributes, mark * the attributes as expired so that they will be * regotten via the NFS_ACL GETATTR2 procedure. */ if (VTOMI(*vpp)->mi_flags & MI_ACL) { PURGE_ATTRCACHE(*vpp); } if (!(rfscall_flags & RFSCALL_SOFT)) dnlc_update(dvp, nm, *vpp); } else { PURGE_STALE_FH(error, dvp, cr); if (error == ENOENT && nfs_lookup_neg_cache) dnlc_enter(dvp, nm, DNLC_NO_VNODE); } } return (error); } /* ARGSUSED */ static int nfs_create(vnode_t *dvp, char *nm, struct vattr *va, enum vcexcl exclusive, int mode, vnode_t **vpp, cred_t *cr, int lfaware, caller_context_t *ct, vsecattr_t *vsecp) { int error; struct nfscreatargs args; struct nfsdiropres dr; int douprintf; vnode_t *vp; rnode_t *rp; struct vattr vattr; rnode_t *drp; vnode_t *tempvp; hrtime_t t; drp = VTOR(dvp); if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp))) return (EINTR); /* * We make a copy of the attributes because the caller does not * expect us to change what va points to. */ vattr = *va; /* * If the pathname is "", just use dvp. Don't need * to send it over the wire, look it up in the dnlc, * or perform any access checks. */ if (*nm == '\0') { error = 0; VN_HOLD(dvp); vp = dvp; /* * If the pathname is ".", just use dvp. Don't need * to send it over the wire or look it up in the dnlc, * just need to check access. */ } else if (strcmp(nm, ".") == 0) { error = nfs_access(dvp, VEXEC, 0, cr, ct); if (error) { nfs_rw_exit(&drp->r_rwlock); return (error); } VN_HOLD(dvp); vp = dvp; /* * We need to go over the wire, just to be sure whether the * file exists or not. Using the DNLC can be dangerous in * this case when making a decision regarding existence. */ } else { error = nfslookup_otw(dvp, nm, &vp, cr, 0); } if (!error) { if (exclusive == EXCL) error = EEXIST; else if (vp->v_type == VDIR && (mode & VWRITE)) error = EISDIR; else { /* * If vnode is a device, create special vnode. */ if (IS_DEVVP(vp)) { tempvp = vp; vp = specvp(vp, vp->v_rdev, vp->v_type, cr); VN_RELE(tempvp); } if (!(error = VOP_ACCESS(vp, mode, 0, cr, ct))) { if ((vattr.va_mask & AT_SIZE) && vp->v_type == VREG) { vattr.va_mask = AT_SIZE; error = nfssetattr(vp, &vattr, 0, cr); } } } nfs_rw_exit(&drp->r_rwlock); if (error) { VN_RELE(vp); } else { /* * existing file got truncated, notify. */ vnevent_create(vp, ct); *vpp = vp; } return (error); } ASSERT(vattr.va_mask & AT_TYPE); if (vattr.va_type == VREG) { ASSERT(vattr.va_mask & AT_MODE); if (MANDMODE(vattr.va_mode)) { nfs_rw_exit(&drp->r_rwlock); return (EACCES); } } dnlc_remove(dvp, nm); setdiropargs(&args.ca_da, nm, dvp); /* * Decide what the group-id of the created file should be. * Set it in attribute list as advisory...then do a setattr * if the server didn't get it right the first time. */ error = setdirgid(dvp, &vattr.va_gid, cr); if (error) { nfs_rw_exit(&drp->r_rwlock); return (error); } vattr.va_mask |= AT_GID; /* * This is a completely gross hack to make mknod * work over the wire until we can wack the protocol */ #define IFCHR 0020000 /* character special */ #define IFBLK 0060000 /* block special */ #define IFSOCK 0140000 /* socket */ /* * dev_t is uint_t in 5.x and short in 4.x. Both 4.x * supports 8 bit majors. 5.x supports 14 bit majors. 5.x supports 18 * bits in the minor number where 4.x supports 8 bits. If the 5.x * minor/major numbers <= 8 bits long, compress the device * number before sending it. Otherwise, the 4.x server will not * create the device with the correct device number and nothing can be * done about this. */ if (vattr.va_type == VCHR || vattr.va_type == VBLK) { dev_t d = vattr.va_rdev; dev32_t dev32; if (vattr.va_type == VCHR) vattr.va_mode |= IFCHR; else vattr.va_mode |= IFBLK; (void) cmpldev(&dev32, d); if (dev32 & ~((SO4_MAXMAJ << L_BITSMINOR32) | SO4_MAXMIN)) vattr.va_size = (u_offset_t)dev32; else vattr.va_size = (u_offset_t)nfsv2_cmpdev(d); vattr.va_mask |= AT_MODE|AT_SIZE; } else if (vattr.va_type == VFIFO) { vattr.va_mode |= IFCHR; /* xtra kludge for namedpipe */ vattr.va_size = (u_offset_t)NFS_FIFO_DEV; /* blech */ vattr.va_mask |= AT_MODE|AT_SIZE; } else if (vattr.va_type == VSOCK) { vattr.va_mode |= IFSOCK; /* * To avoid triggering bugs in the servers set AT_SIZE * (all other RFS_CREATE calls set this). */ vattr.va_size = 0; vattr.va_mask |= AT_MODE|AT_SIZE; } args.ca_sa = &args.ca_sa_buf; error = vattr_to_sattr(&vattr, args.ca_sa); if (error) { /* req time field(s) overflow - return immediately */ nfs_rw_exit(&drp->r_rwlock); return (error); } douprintf = 1; t = gethrtime(); error = rfs2call(VTOMI(dvp), RFS_CREATE, xdr_creatargs, (caddr_t)&args, xdr_diropres, (caddr_t)&dr, cr, &douprintf, &dr.dr_status, 0, NULL); PURGE_ATTRCACHE(dvp); /* mod time changed */ if (!error) { error = geterrno(dr.dr_status); if (!error) { if (HAVE_RDDIR_CACHE(drp)) nfs_purge_rddir_cache(dvp); vp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr, dvp->v_vfsp, t, cr, NULL, NULL); /* * If NFS_ACL is supported on the server, then the * attributes returned by server may have minimal * permissions sometimes denying access to users having * proper access. To get the proper attributes, mark * the attributes as expired so that they will be * regotten via the NFS_ACL GETATTR2 procedure. */ if (VTOMI(vp)->mi_flags & MI_ACL) { PURGE_ATTRCACHE(vp); } dnlc_update(dvp, nm, vp); rp = VTOR(vp); if (vattr.va_size == 0) { mutex_enter(&rp->r_statelock); rp->r_size = 0; mutex_exit(&rp->r_statelock); if (vn_has_cached_data(vp)) { ASSERT(vp->v_type != VCHR); nfs_invalidate_pages(vp, (u_offset_t)0, cr); } } /* * Make sure the gid was set correctly. * If not, try to set it (but don't lose * any sleep over it). */ if (vattr.va_gid != rp->r_attr.va_gid) { vattr.va_mask = AT_GID; (void) nfssetattr(vp, &vattr, 0, cr); } /* * If vnode is a device create special vnode */ if (IS_DEVVP(vp)) { *vpp = specvp(vp, vp->v_rdev, vp->v_type, cr); VN_RELE(vp); } else *vpp = vp; } else { PURGE_STALE_FH(error, dvp, cr); } } nfs_rw_exit(&drp->r_rwlock); return (error); } /* * Weirdness: if the vnode to be removed is open * we rename it instead of removing it and nfs_inactive * will remove the new name. */ /* ARGSUSED */ static int nfs_remove(vnode_t *dvp, char *nm, cred_t *cr, caller_context_t *ct, int flags) { int error; struct nfsdiropargs da; enum nfsstat status; vnode_t *vp; char *tmpname; int douprintf; rnode_t *rp; rnode_t *drp; if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); drp = VTOR(dvp); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp))) return (EINTR); error = nfslookup(dvp, nm, &vp, NULL, 0, NULL, cr, 0); if (error) { nfs_rw_exit(&drp->r_rwlock); return (error); } if (vp->v_type == VDIR && secpolicy_fs_linkdir(cr, dvp->v_vfsp)) { VN_RELE(vp); nfs_rw_exit(&drp->r_rwlock); return (EPERM); } /* * First just remove the entry from the name cache, as it * is most likely the only entry for this vp. */ dnlc_remove(dvp, nm); /* * If the file has a v_count > 1 then there may be more than one * entry in the name cache due multiple links or an open file, * but we don't have the real reference count so flush all * possible entries. */ if (vp->v_count > 1) dnlc_purge_vp(vp); /* * Now we have the real reference count on the vnode */ rp = VTOR(vp); mutex_enter(&rp->r_statelock); if (vp->v_count > 1 && (rp->r_unldvp == NULL || strcmp(nm, rp->r_unlname) == 0)) { mutex_exit(&rp->r_statelock); tmpname = newname(); error = nfsrename(dvp, nm, dvp, tmpname, cr, ct); if (error) kmem_free(tmpname, MAXNAMELEN); else { mutex_enter(&rp->r_statelock); if (rp->r_unldvp == NULL) { VN_HOLD(dvp); rp->r_unldvp = dvp; if (rp->r_unlcred != NULL) crfree(rp->r_unlcred); crhold(cr); rp->r_unlcred = cr; rp->r_unlname = tmpname; } else { kmem_free(rp->r_unlname, MAXNAMELEN); rp->r_unlname = tmpname; } mutex_exit(&rp->r_statelock); } } else { mutex_exit(&rp->r_statelock); /* * We need to flush any dirty pages which happen to * be hanging around before removing the file. This * shouldn't happen very often and mostly on file * systems mounted "nocto". */ if (vn_has_cached_data(vp) && ((rp->r_flags & RDIRTY) || rp->r_count > 0)) { error = nfs_putpage(vp, (offset_t)0, 0, 0, cr, ct); if (error && (error == ENOSPC || error == EDQUOT)) { mutex_enter(&rp->r_statelock); if (!rp->r_error) rp->r_error = error; mutex_exit(&rp->r_statelock); } } setdiropargs(&da, nm, dvp); douprintf = 1; error = rfs2call(VTOMI(dvp), RFS_REMOVE, xdr_diropargs, (caddr_t)&da, xdr_enum, (caddr_t)&status, cr, &douprintf, &status, 0, NULL); /* * The xattr dir may be gone after last attr is removed, * so flush it from dnlc. */ if (dvp->v_flag & V_XATTRDIR) dnlc_purge_vp(dvp); PURGE_ATTRCACHE(dvp); /* mod time changed */ PURGE_ATTRCACHE(vp); /* link count changed */ if (!error) { error = geterrno(status); if (!error) { if (HAVE_RDDIR_CACHE(drp)) nfs_purge_rddir_cache(dvp); } else { PURGE_STALE_FH(error, dvp, cr); } } } if (error == 0) { vnevent_remove(vp, dvp, nm, ct); } VN_RELE(vp); nfs_rw_exit(&drp->r_rwlock); return (error); } /* ARGSUSED */ static int nfs_link(vnode_t *tdvp, vnode_t *svp, char *tnm, cred_t *cr, caller_context_t *ct, int flags) { int error; struct nfslinkargs args; enum nfsstat status; vnode_t *realvp; int douprintf; rnode_t *tdrp; if (nfs_zone() != VTOMI(tdvp)->mi_zone) return (EPERM); if (VOP_REALVP(svp, &realvp, ct) == 0) svp = realvp; args.la_from = VTOFH(svp); setdiropargs(&args.la_to, tnm, tdvp); tdrp = VTOR(tdvp); if (nfs_rw_enter_sig(&tdrp->r_rwlock, RW_WRITER, INTR(tdvp))) return (EINTR); dnlc_remove(tdvp, tnm); douprintf = 1; error = rfs2call(VTOMI(svp), RFS_LINK, xdr_linkargs, (caddr_t)&args, xdr_enum, (caddr_t)&status, cr, &douprintf, &status, 0, NULL); PURGE_ATTRCACHE(tdvp); /* mod time changed */ PURGE_ATTRCACHE(svp); /* link count changed */ if (!error) { error = geterrno(status); if (!error) { if (HAVE_RDDIR_CACHE(tdrp)) nfs_purge_rddir_cache(tdvp); } } nfs_rw_exit(&tdrp->r_rwlock); if (!error) { /* * Notify the source file of this link operation. */ vnevent_link(svp, ct); } return (error); } /* ARGSUSED */ static int nfs_rename(vnode_t *odvp, char *onm, vnode_t *ndvp, char *nnm, cred_t *cr, caller_context_t *ct, int flags) { vnode_t *realvp; if (nfs_zone() != VTOMI(odvp)->mi_zone) return (EPERM); if (VOP_REALVP(ndvp, &realvp, ct) == 0) ndvp = realvp; return (nfsrename(odvp, onm, ndvp, nnm, cr, ct)); } /* * nfsrename does the real work of renaming in NFS Version 2. */ static int nfsrename(vnode_t *odvp, char *onm, vnode_t *ndvp, char *nnm, cred_t *cr, caller_context_t *ct) { int error; enum nfsstat status; struct nfsrnmargs args; int douprintf; vnode_t *nvp = NULL; vnode_t *ovp = NULL; char *tmpname; rnode_t *rp; rnode_t *odrp; rnode_t *ndrp; ASSERT(nfs_zone() == VTOMI(odvp)->mi_zone); if (strcmp(onm, ".") == 0 || strcmp(onm, "..") == 0 || strcmp(nnm, ".") == 0 || strcmp(nnm, "..") == 0) return (EINVAL); odrp = VTOR(odvp); ndrp = VTOR(ndvp); if ((intptr_t)odrp < (intptr_t)ndrp) { if (nfs_rw_enter_sig(&odrp->r_rwlock, RW_WRITER, INTR(odvp))) return (EINTR); if (nfs_rw_enter_sig(&ndrp->r_rwlock, RW_WRITER, INTR(ndvp))) { nfs_rw_exit(&odrp->r_rwlock); return (EINTR); } } else { if (nfs_rw_enter_sig(&ndrp->r_rwlock, RW_WRITER, INTR(ndvp))) return (EINTR); if (nfs_rw_enter_sig(&odrp->r_rwlock, RW_WRITER, INTR(odvp))) { nfs_rw_exit(&ndrp->r_rwlock); return (EINTR); } } /* * Lookup the target file. If it exists, it needs to be * checked to see whether it is a mount point and whether * it is active (open). */ error = nfslookup(ndvp, nnm, &nvp, NULL, 0, NULL, cr, 0); if (!error) { /* * If this file has been mounted on, then just * return busy because renaming to it would remove * the mounted file system from the name space. */ if (vn_mountedvfs(nvp) != NULL) { VN_RELE(nvp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (EBUSY); } /* * Purge the name cache of all references to this vnode * so that we can check the reference count to infer * whether it is active or not. */ /* * First just remove the entry from the name cache, as it * is most likely the only entry for this vp. */ dnlc_remove(ndvp, nnm); /* * If the file has a v_count > 1 then there may be more * than one entry in the name cache due multiple links * or an open file, but we don't have the real reference * count so flush all possible entries. */ if (nvp->v_count > 1) dnlc_purge_vp(nvp); /* * If the vnode is active and is not a directory, * arrange to rename it to a * temporary file so that it will continue to be * accessible. This implements the "unlink-open-file" * semantics for the target of a rename operation. * Before doing this though, make sure that the * source and target files are not already the same. */ if (nvp->v_count > 1 && nvp->v_type != VDIR) { /* * Lookup the source name. */ error = nfslookup(odvp, onm, &ovp, NULL, 0, NULL, cr, 0); /* * The source name *should* already exist. */ if (error) { VN_RELE(nvp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (error); } /* * Compare the two vnodes. If they are the same, * just release all held vnodes and return success. */ if (ovp == nvp) { VN_RELE(ovp); VN_RELE(nvp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (0); } /* * Can't mix and match directories and non- * directories in rename operations. We already * know that the target is not a directory. If * the source is a directory, return an error. */ if (ovp->v_type == VDIR) { VN_RELE(ovp); VN_RELE(nvp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (ENOTDIR); } /* * The target file exists, is not the same as * the source file, and is active. Link it * to a temporary filename to avoid having * the server removing the file completely. */ tmpname = newname(); error = nfs_link(ndvp, nvp, tmpname, cr, NULL, 0); if (error == EOPNOTSUPP) { error = nfs_rename(ndvp, nnm, ndvp, tmpname, cr, NULL, 0); } if (error) { kmem_free(tmpname, MAXNAMELEN); VN_RELE(ovp); VN_RELE(nvp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (error); } rp = VTOR(nvp); mutex_enter(&rp->r_statelock); if (rp->r_unldvp == NULL) { VN_HOLD(ndvp); rp->r_unldvp = ndvp; if (rp->r_unlcred != NULL) crfree(rp->r_unlcred); crhold(cr); rp->r_unlcred = cr; rp->r_unlname = tmpname; } else { kmem_free(rp->r_unlname, MAXNAMELEN); rp->r_unlname = tmpname; } mutex_exit(&rp->r_statelock); } } if (ovp == NULL) { /* * When renaming directories to be a subdirectory of a * different parent, the dnlc entry for ".." will no * longer be valid, so it must be removed. * * We do a lookup here to determine whether we are renaming * a directory and we need to check if we are renaming * an unlinked file. This might have already been done * in previous code, so we check ovp == NULL to avoid * doing it twice. */ error = nfslookup(odvp, onm, &ovp, NULL, 0, NULL, cr, 0); /* * The source name *should* already exist. */ if (error) { nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); if (nvp) { VN_RELE(nvp); } return (error); } ASSERT(ovp != NULL); } dnlc_remove(odvp, onm); dnlc_remove(ndvp, nnm); setdiropargs(&args.rna_from, onm, odvp); setdiropargs(&args.rna_to, nnm, ndvp); douprintf = 1; error = rfs2call(VTOMI(odvp), RFS_RENAME, xdr_rnmargs, (caddr_t)&args, xdr_enum, (caddr_t)&status, cr, &douprintf, &status, 0, NULL); PURGE_ATTRCACHE(odvp); /* mod time changed */ PURGE_ATTRCACHE(ndvp); /* mod time changed */ if (!error) { error = geterrno(status); if (!error) { if (HAVE_RDDIR_CACHE(odrp)) nfs_purge_rddir_cache(odvp); if (HAVE_RDDIR_CACHE(ndrp)) nfs_purge_rddir_cache(ndvp); /* * when renaming directories to be a subdirectory of a * different parent, the dnlc entry for ".." will no * longer be valid, so it must be removed */ rp = VTOR(ovp); if (ndvp != odvp) { if (ovp->v_type == VDIR) { dnlc_remove(ovp, ".."); if (HAVE_RDDIR_CACHE(rp)) nfs_purge_rddir_cache(ovp); } } /* * If we are renaming the unlinked file, update the * r_unldvp and r_unlname as needed. */ mutex_enter(&rp->r_statelock); if (rp->r_unldvp != NULL) { if (strcmp(rp->r_unlname, onm) == 0) { (void) strncpy(rp->r_unlname, nnm, MAXNAMELEN); rp->r_unlname[MAXNAMELEN - 1] = '\0'; if (ndvp != rp->r_unldvp) { VN_RELE(rp->r_unldvp); rp->r_unldvp = ndvp; VN_HOLD(ndvp); } } } mutex_exit(&rp->r_statelock); } else { /* * System V defines rename to return EEXIST, not * ENOTEMPTY if the target directory is not empty. * Over the wire, the error is NFSERR_ENOTEMPTY * which geterrno maps to ENOTEMPTY. */ if (error == ENOTEMPTY) error = EEXIST; } } if (error == 0) { if (nvp) vnevent_rename_dest(nvp, ndvp, nnm, ct); if (odvp != ndvp) vnevent_rename_dest_dir(ndvp, ct); ASSERT(ovp != NULL); vnevent_rename_src(ovp, odvp, onm, ct); } if (nvp) { VN_RELE(nvp); } VN_RELE(ovp); nfs_rw_exit(&odrp->r_rwlock); nfs_rw_exit(&ndrp->r_rwlock); return (error); } /* ARGSUSED */ static int nfs_mkdir(vnode_t *dvp, char *nm, struct vattr *va, vnode_t **vpp, cred_t *cr, caller_context_t *ct, int flags, vsecattr_t *vsecp) { int error; struct nfscreatargs args; struct nfsdiropres dr; int douprintf; rnode_t *drp; hrtime_t t; if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); setdiropargs(&args.ca_da, nm, dvp); /* * Decide what the group-id and set-gid bit of the created directory * should be. May have to do a setattr to get the gid right. */ error = setdirgid(dvp, &va->va_gid, cr); if (error) return (error); error = setdirmode(dvp, &va->va_mode, cr); if (error) return (error); va->va_mask |= AT_MODE|AT_GID; args.ca_sa = &args.ca_sa_buf; error = vattr_to_sattr(va, args.ca_sa); if (error) { /* req time field(s) overflow - return immediately */ return (error); } drp = VTOR(dvp); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp))) return (EINTR); dnlc_remove(dvp, nm); douprintf = 1; t = gethrtime(); error = rfs2call(VTOMI(dvp), RFS_MKDIR, xdr_creatargs, (caddr_t)&args, xdr_diropres, (caddr_t)&dr, cr, &douprintf, &dr.dr_status, 0, NULL); PURGE_ATTRCACHE(dvp); /* mod time changed */ if (!error) { error = geterrno(dr.dr_status); if (!error) { if (HAVE_RDDIR_CACHE(drp)) nfs_purge_rddir_cache(dvp); /* * The attributes returned by RFS_MKDIR can not * be depended upon, so mark the attribute cache * as purged. A subsequent GETATTR will get the * correct attributes from the server. */ *vpp = makenfsnode(&dr.dr_fhandle, &dr.dr_attr, dvp->v_vfsp, t, cr, NULL, NULL); PURGE_ATTRCACHE(*vpp); dnlc_update(dvp, nm, *vpp); /* * Make sure the gid was set correctly. * If not, try to set it (but don't lose * any sleep over it). */ if (va->va_gid != VTOR(*vpp)->r_attr.va_gid) { va->va_mask = AT_GID; (void) nfssetattr(*vpp, va, 0, cr); } } else { PURGE_STALE_FH(error, dvp, cr); } } nfs_rw_exit(&drp->r_rwlock); return (error); } /* ARGSUSED */ static int nfs_rmdir(vnode_t *dvp, char *nm, vnode_t *cdir, cred_t *cr, caller_context_t *ct, int flags) { int error; enum nfsstat status; struct nfsdiropargs da; vnode_t *vp; int douprintf; rnode_t *drp; if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); drp = VTOR(dvp); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp))) return (EINTR); /* * Attempt to prevent a rmdir(".") from succeeding. */ error = nfslookup(dvp, nm, &vp, NULL, 0, NULL, cr, 0); if (error) { nfs_rw_exit(&drp->r_rwlock); return (error); } if (vp == cdir) { VN_RELE(vp); nfs_rw_exit(&drp->r_rwlock); return (EINVAL); } setdiropargs(&da, nm, dvp); /* * First just remove the entry from the name cache, as it * is most likely an entry for this vp. */ dnlc_remove(dvp, nm); /* * If there vnode reference count is greater than one, then * there may be additional references in the DNLC which will * need to be purged. First, trying removing the entry for * the parent directory and see if that removes the additional * reference(s). If that doesn't do it, then use dnlc_purge_vp * to completely remove any references to the directory which * might still exist in the DNLC. */ if (vp->v_count > 1) { dnlc_remove(vp, ".."); if (vp->v_count > 1) dnlc_purge_vp(vp); } douprintf = 1; error = rfs2call(VTOMI(dvp), RFS_RMDIR, xdr_diropargs, (caddr_t)&da, xdr_enum, (caddr_t)&status, cr, &douprintf, &status, 0, NULL); PURGE_ATTRCACHE(dvp); /* mod time changed */ if (error) { VN_RELE(vp); nfs_rw_exit(&drp->r_rwlock); return (error); } error = geterrno(status); if (!error) { if (HAVE_RDDIR_CACHE(drp)) nfs_purge_rddir_cache(dvp); if (HAVE_RDDIR_CACHE(VTOR(vp))) nfs_purge_rddir_cache(vp); } else { PURGE_STALE_FH(error, dvp, cr); /* * System V defines rmdir to return EEXIST, not * ENOTEMPTY if the directory is not empty. Over * the wire, the error is NFSERR_ENOTEMPTY which * geterrno maps to ENOTEMPTY. */ if (error == ENOTEMPTY) error = EEXIST; } if (error == 0) { vnevent_rmdir(vp, dvp, nm, ct); } VN_RELE(vp); nfs_rw_exit(&drp->r_rwlock); return (error); } /* ARGSUSED */ static int nfs_symlink(vnode_t *dvp, char *lnm, struct vattr *tva, char *tnm, cred_t *cr, caller_context_t *ct, int flags) { int error; struct nfsslargs args; enum nfsstat status; int douprintf; rnode_t *drp; if (nfs_zone() != VTOMI(dvp)->mi_zone) return (EPERM); setdiropargs(&args.sla_from, lnm, dvp); args.sla_sa = &args.sla_sa_buf; error = vattr_to_sattr(tva, args.sla_sa); if (error) { /* req time field(s) overflow - return immediately */ return (error); } args.sla_tnm = tnm; drp = VTOR(dvp); if (nfs_rw_enter_sig(&drp->r_rwlock, RW_WRITER, INTR(dvp))) return (EINTR); dnlc_remove(dvp, lnm); douprintf = 1; error = rfs2call(VTOMI(dvp), RFS_SYMLINK, xdr_slargs, (caddr_t)&args, xdr_enum, (caddr_t)&status, cr, &douprintf, &status, 0, NULL); PURGE_ATTRCACHE(dvp); /* mod time changed */ if (!error) { error = geterrno(status); if (!error) { if (HAVE_RDDIR_CACHE(drp)) nfs_purge_rddir_cache(dvp); } else { PURGE_STALE_FH(error, dvp, cr); } } nfs_rw_exit(&drp->r_rwlock); return (error); } #ifdef DEBUG static int nfs_readdir_cache_hits = 0; static int nfs_readdir_cache_shorts = 0; static int nfs_readdir_cache_waits = 0; static int nfs_readdir_cache_misses = 0; static int nfs_readdir_readahead = 0; #endif static int nfs_shrinkreaddir = 0; /* * Read directory entries. * There are some weird things to look out for here. The uio_offset * field is either 0 or it is the offset returned from a previous * readdir. It is an opaque value used by the server to find the * correct directory block to read. The count field is the number * of blocks to read on the server. This is advisory only, the server * may return only one block's worth of entries. Entries may be compressed * on the server. */ /* ARGSUSED */ static int nfs_readdir(vnode_t *vp, struct uio *uiop, cred_t *cr, int *eofp, caller_context_t *ct, int flags) { int error; size_t count; rnode_t *rp; rddir_cache *rdc; rddir_cache *nrdc; rddir_cache *rrdc; #ifdef DEBUG int missed; #endif rddir_cache srdc; avl_index_t where; rp = VTOR(vp); ASSERT(nfs_rw_lock_held(&rp->r_rwlock, RW_READER)); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* * Make sure that the directory cache is valid. */ if (HAVE_RDDIR_CACHE(rp)) { if (nfs_disable_rddir_cache) { /* * Setting nfs_disable_rddir_cache in /etc/system * allows interoperability with servers that do not * properly update the attributes of directories. * Any cached information gets purged before an * access is made to it. */ nfs_purge_rddir_cache(vp); } else { error = nfs_validate_caches(vp, cr); if (error) return (error); } } /* * UGLINESS: SunOS 3.2 servers apparently cannot always handle an * RFS_READDIR request with rda_count set to more than 0x400. So * we reduce the request size here purely for compatibility. * * In general, this is no longer required. However, if a server * is discovered which can not handle requests larger than 1024, * nfs_shrinkreaddir can be set to 1 to enable this backwards * compatibility. * * In any case, the request size is limited to NFS_MAXDATA bytes. */ count = MIN(uiop->uio_iov->iov_len, nfs_shrinkreaddir ? 0x400 : NFS_MAXDATA); nrdc = NULL; #ifdef DEBUG missed = 0; #endif top: /* * Short circuit last readdir which always returns 0 bytes. * This can be done after the directory has been read through * completely at least once. This will set r_direof which * can be used to find the value of the last cookie. */ mutex_enter(&rp->r_statelock); if (rp->r_direof != NULL && uiop->uio_offset == rp->r_direof->nfs_ncookie) { mutex_exit(&rp->r_statelock); #ifdef DEBUG nfs_readdir_cache_shorts++; #endif if (eofp) *eofp = 1; if (nrdc != NULL) rddir_cache_rele(nrdc); return (0); } /* * Look for a cache entry. Cache entries are identified * by the NFS cookie value and the byte count requested. */ srdc.nfs_cookie = uiop->uio_offset; srdc.buflen = count; rdc = avl_find(&rp->r_dir, &srdc, &where); if (rdc != NULL) { rddir_cache_hold(rdc); /* * If the cache entry is in the process of being * filled in, wait until this completes. The * RDDIRWAIT bit is set to indicate that someone * is waiting and then the thread currently * filling the entry is done, it should do a * cv_broadcast to wakeup all of the threads * waiting for it to finish. */ if (rdc->flags & RDDIR) { nfs_rw_exit(&rp->r_rwlock); rdc->flags |= RDDIRWAIT; #ifdef DEBUG nfs_readdir_cache_waits++; #endif if (!cv_wait_sig(&rdc->cv, &rp->r_statelock)) { /* * We got interrupted, probably * the user typed ^C or an alarm * fired. We free the new entry * if we allocated one. */ mutex_exit(&rp->r_statelock); (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE); rddir_cache_rele(rdc); if (nrdc != NULL) rddir_cache_rele(nrdc); return (EINTR); } mutex_exit(&rp->r_statelock); (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE); rddir_cache_rele(rdc); goto top; } /* * Check to see if a readdir is required to * fill the entry. If so, mark this entry * as being filled, remove our reference, * and branch to the code to fill the entry. */ if (rdc->flags & RDDIRREQ) { rdc->flags &= ~RDDIRREQ; rdc->flags |= RDDIR; if (nrdc != NULL) rddir_cache_rele(nrdc); nrdc = rdc; mutex_exit(&rp->r_statelock); goto bottom; } #ifdef DEBUG if (!missed) nfs_readdir_cache_hits++; #endif /* * If an error occurred while attempting * to fill the cache entry, just return it. */ if (rdc->error) { error = rdc->error; mutex_exit(&rp->r_statelock); rddir_cache_rele(rdc); if (nrdc != NULL) rddir_cache_rele(nrdc); return (error); } /* * The cache entry is complete and good, * copyout the dirent structs to the calling * thread. */ error = uiomove(rdc->entries, rdc->entlen, UIO_READ, uiop); /* * If no error occurred during the copyout, * update the offset in the uio struct to * contain the value of the next cookie * and set the eof value appropriately. */ if (!error) { uiop->uio_offset = rdc->nfs_ncookie; if (eofp) *eofp = rdc->eof; } /* * Decide whether to do readahead. Don't if * have already read to the end of directory. */ if (rdc->eof) { rp->r_direof = rdc; mutex_exit(&rp->r_statelock); rddir_cache_rele(rdc); if (nrdc != NULL) rddir_cache_rele(nrdc); return (error); } /* * Check to see whether we found an entry * for the readahead. If so, we don't need * to do anything further, so free the new * entry if one was allocated. Otherwise, * allocate a new entry, add it to the cache, * and then initiate an asynchronous readdir * operation to fill it. */ srdc.nfs_cookie = rdc->nfs_ncookie; srdc.buflen = count; rrdc = avl_find(&rp->r_dir, &srdc, &where); if (rrdc != NULL) { if (nrdc != NULL) rddir_cache_rele(nrdc); } else { if (nrdc != NULL) rrdc = nrdc; else { rrdc = rddir_cache_alloc(KM_NOSLEEP); } if (rrdc != NULL) { rrdc->nfs_cookie = rdc->nfs_ncookie; rrdc->buflen = count; avl_insert(&rp->r_dir, rrdc, where); rddir_cache_hold(rrdc); mutex_exit(&rp->r_statelock); rddir_cache_rele(rdc); #ifdef DEBUG nfs_readdir_readahead++; #endif nfs_async_readdir(vp, rrdc, cr, nfsreaddir); return (error); } } mutex_exit(&rp->r_statelock); rddir_cache_rele(rdc); return (error); } /* * Didn't find an entry in the cache. Construct a new empty * entry and link it into the cache. Other processes attempting * to access this entry will need to wait until it is filled in. * * Since kmem_alloc may block, another pass through the cache * will need to be taken to make sure that another process * hasn't already added an entry to the cache for this request. */ if (nrdc == NULL) { mutex_exit(&rp->r_statelock); nrdc = rddir_cache_alloc(KM_SLEEP); nrdc->nfs_cookie = uiop->uio_offset; nrdc->buflen = count; goto top; } /* * Add this entry to the cache. */ avl_insert(&rp->r_dir, nrdc, where); rddir_cache_hold(nrdc); mutex_exit(&rp->r_statelock); bottom: #ifdef DEBUG missed = 1; nfs_readdir_cache_misses++; #endif /* * Do the readdir. */ error = nfsreaddir(vp, nrdc, cr); /* * If this operation failed, just return the error which occurred. */ if (error != 0) return (error); /* * Since the RPC operation will have taken sometime and blocked * this process, another pass through the cache will need to be * taken to find the correct cache entry. It is possible that * the correct cache entry will not be there (although one was * added) because the directory changed during the RPC operation * and the readdir cache was flushed. In this case, just start * over. It is hoped that this will not happen too often... :-) */ nrdc = NULL; goto top; /* NOTREACHED */ } static int nfsreaddir(vnode_t *vp, rddir_cache *rdc, cred_t *cr) { int error; struct nfsrddirargs rda; struct nfsrddirres rd; rnode_t *rp; mntinfo_t *mi; uint_t count; int douprintf; failinfo_t fi, *fip; ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); count = rdc->buflen; rp = VTOR(vp); mi = VTOMI(vp); rda.rda_fh = *VTOFH(vp); rda.rda_offset = rdc->nfs_cookie; /* * NFS client failover support * suppress failover unless we have a zero cookie */ if (rdc->nfs_cookie == (off_t)0) { fi.vp = vp; fi.fhp = (caddr_t)&rda.rda_fh; fi.copyproc = nfscopyfh; fi.lookupproc = nfslookup; fi.xattrdirproc = acl_getxattrdir2; fip = &fi; } else { fip = NULL; } rd.rd_entries = kmem_alloc(rdc->buflen, KM_SLEEP); rd.rd_size = count; rd.rd_offset = rda.rda_offset; douprintf = 1; if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_enter(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } do { rda.rda_count = MIN(count, mi->mi_curread); error = rfs2call(mi, RFS_READDIR, xdr_rddirargs, (caddr_t)&rda, xdr_getrddirres, (caddr_t)&rd, cr, &douprintf, &rd.rd_status, 0, fip); } while (error == ENFS_TRYAGAIN); if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); kstat_runq_exit(KSTAT_IO_PTR(mi->mi_io_kstats)); mutex_exit(&mi->mi_lock); } /* * Since we are actually doing a READDIR RPC, we must have * exclusive access to the cache entry being filled. Thus, * it is safe to update all fields except for the flags * field. The r_statelock in the rnode must be held to * prevent two different threads from simultaneously * attempting to update the flags field. This can happen * if we are turning off RDDIR and the other thread is * trying to set RDDIRWAIT. */ ASSERT(rdc->flags & RDDIR); if (!error) { error = geterrno(rd.rd_status); if (!error) { rdc->nfs_ncookie = rd.rd_offset; rdc->eof = rd.rd_eof ? 1 : 0; rdc->entlen = rd.rd_size; ASSERT(rdc->entlen <= rdc->buflen); #ifdef DEBUG rdc->entries = rddir_cache_buf_alloc(rdc->buflen, KM_SLEEP); #else rdc->entries = kmem_alloc(rdc->buflen, KM_SLEEP); #endif bcopy(rd.rd_entries, rdc->entries, rdc->entlen); rdc->error = 0; if (mi->mi_io_kstats) { mutex_enter(&mi->mi_lock); KSTAT_IO_PTR(mi->mi_io_kstats)->reads++; KSTAT_IO_PTR(mi->mi_io_kstats)->nread += rd.rd_size; mutex_exit(&mi->mi_lock); } } else { PURGE_STALE_FH(error, vp, cr); } } if (error) { rdc->entries = NULL; rdc->error = error; } kmem_free(rd.rd_entries, rdc->buflen); mutex_enter(&rp->r_statelock); rdc->flags &= ~RDDIR; if (rdc->flags & RDDIRWAIT) { rdc->flags &= ~RDDIRWAIT; cv_broadcast(&rdc->cv); } if (error) rdc->flags |= RDDIRREQ; mutex_exit(&rp->r_statelock); rddir_cache_rele(rdc); return (error); } #ifdef DEBUG static int nfs_bio_do_stop = 0; #endif static int nfs_bio(struct buf *bp, cred_t *cr) { rnode_t *rp = VTOR(bp->b_vp); int count; int error; cred_t *cred; uint_t offset; DTRACE_IO1(start, struct buf *, bp); ASSERT(nfs_zone() == VTOMI(bp->b_vp)->mi_zone); offset = dbtob(bp->b_blkno); if (bp->b_flags & B_READ) { mutex_enter(&rp->r_statelock); if (rp->r_cred != NULL) { cred = rp->r_cred; crhold(cred); } else { rp->r_cred = cr; crhold(cr); cred = cr; crhold(cred); } mutex_exit(&rp->r_statelock); read_again: error = bp->b_error = nfsread(bp->b_vp, bp->b_un.b_addr, offset, bp->b_bcount, &bp->b_resid, cred); crfree(cred); if (!error) { if (bp->b_resid) { /* * Didn't get it all because we hit EOF, * zero all the memory beyond the EOF. */ /* bzero(rdaddr + */ bzero(bp->b_un.b_addr + bp->b_bcount - bp->b_resid, bp->b_resid); } mutex_enter(&rp->r_statelock); if (bp->b_resid == bp->b_bcount && offset >= rp->r_size) { /* * We didn't read anything at all as we are * past EOF. Return an error indicator back * but don't destroy the pages (yet). */ error = NFS_EOF; } mutex_exit(&rp->r_statelock); } else if (error == EACCES) { mutex_enter(&rp->r_statelock); if (cred != cr) { if (rp->r_cred != NULL) crfree(rp->r_cred); rp->r_cred = cr; crhold(cr); cred = cr; crhold(cred); mutex_exit(&rp->r_statelock); goto read_again; } mutex_exit(&rp->r_statelock); } } else { if (!(rp->r_flags & RSTALE)) { mutex_enter(&rp->r_statelock); if (rp->r_cred != NULL) { cred = rp->r_cred; crhold(cred); } else { rp->r_cred = cr; crhold(cr); cred = cr; crhold(cred); } mutex_exit(&rp->r_statelock); write_again: mutex_enter(&rp->r_statelock); count = MIN(bp->b_bcount, rp->r_size - offset); mutex_exit(&rp->r_statelock); if (count < 0) cmn_err(CE_PANIC, "nfs_bio: write count < 0"); #ifdef DEBUG if (count == 0) { zcmn_err(getzoneid(), CE_WARN, "nfs_bio: zero length write at %d", offset); nfs_printfhandle(&rp->r_fh); if (nfs_bio_do_stop) debug_enter("nfs_bio"); } #endif error = nfswrite(bp->b_vp, bp->b_un.b_addr, offset, count, cred); if (error == EACCES) { mutex_enter(&rp->r_statelock); if (cred != cr) { if (rp->r_cred != NULL) crfree(rp->r_cred); rp->r_cred = cr; crhold(cr); crfree(cred); cred = cr; crhold(cred); mutex_exit(&rp->r_statelock); goto write_again; } mutex_exit(&rp->r_statelock); } bp->b_error = error; if (error && error != EINTR) { /* * Don't print EDQUOT errors on the console. * Don't print asynchronous EACCES errors. * Don't print EFBIG errors. * Print all other write errors. */ if (error != EDQUOT && error != EFBIG && (error != EACCES || !(bp->b_flags & B_ASYNC))) nfs_write_error(bp->b_vp, error, cred); /* * Update r_error and r_flags as appropriate. * If the error was ESTALE, then mark the * rnode as not being writeable and save * the error status. Otherwise, save any * errors which occur from asynchronous * page invalidations. Any errors occurring * from other operations should be saved * by the caller. */ mutex_enter(&rp->r_statelock); if (error == ESTALE) { rp->r_flags |= RSTALE; if (!rp->r_error) rp->r_error = error; } else if (!rp->r_error && (bp->b_flags & (B_INVAL|B_FORCE|B_ASYNC)) == (B_INVAL|B_FORCE|B_ASYNC)) { rp->r_error = error; } mutex_exit(&rp->r_statelock); } crfree(cred); } else error = rp->r_error; } if (error != 0 && error != NFS_EOF) bp->b_flags |= B_ERROR; DTRACE_IO1(done, struct buf *, bp); return (error); } /* ARGSUSED */ static int nfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) { struct nfs_fid *fp; rnode_t *rp; rp = VTOR(vp); if (fidp->fid_len < (sizeof (struct nfs_fid) - sizeof (short))) { fidp->fid_len = sizeof (struct nfs_fid) - sizeof (short); return (ENOSPC); } fp = (struct nfs_fid *)fidp; fp->nf_pad = 0; fp->nf_len = sizeof (struct nfs_fid) - sizeof (short); bcopy(rp->r_fh.fh_buf, fp->nf_data, NFS_FHSIZE); return (0); } /* ARGSUSED2 */ static int nfs_rwlock(vnode_t *vp, int write_lock, caller_context_t *ctp) { rnode_t *rp = VTOR(vp); if (!write_lock) { (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE); return (V_WRITELOCK_FALSE); } if ((rp->r_flags & RDIRECTIO) || (VTOMI(vp)->mi_flags & MI_DIRECTIO)) { (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, FALSE); if (rp->r_mapcnt == 0 && !vn_has_cached_data(vp)) return (V_WRITELOCK_FALSE); nfs_rw_exit(&rp->r_rwlock); } (void) nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER, FALSE); return (V_WRITELOCK_TRUE); } /* ARGSUSED */ static void nfs_rwunlock(vnode_t *vp, int write_lock, caller_context_t *ctp) { rnode_t *rp = VTOR(vp); nfs_rw_exit(&rp->r_rwlock); } /* ARGSUSED */ static int nfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct) { /* * Because we stuff the readdir cookie into the offset field * someone may attempt to do an lseek with the cookie which * we want to succeed. */ if (vp->v_type == VDIR) return (0); if (*noffp < 0 || *noffp > MAXOFF32_T) return (EINVAL); return (0); } /* * number of NFS_MAXDATA blocks to read ahead * optimized for 100 base-T. */ static int nfs_nra = 4; #ifdef DEBUG static int nfs_lostpage = 0; /* number of times we lost original page */ #endif /* * Return all the pages from [off..off+len) in file */ /* ARGSUSED */ static int nfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, cred_t *cr, caller_context_t *ct) { rnode_t *rp; int error; mntinfo_t *mi; if (vp->v_flag & VNOMAP) return (ENOSYS); ASSERT(off <= MAXOFF32_T); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); if (protp != NULL) *protp = PROT_ALL; /* * Now valididate that the caches are up to date. */ error = nfs_validate_caches(vp, cr); if (error) return (error); rp = VTOR(vp); mi = VTOMI(vp); retry: mutex_enter(&rp->r_statelock); /* * Don't create dirty pages faster than they * can be cleaned so that the system doesn't * get imbalanced. If the async queue is * maxed out, then wait for it to drain before * creating more dirty pages. Also, wait for * any threads doing pagewalks in the vop_getattr * entry points so that they don't block for * long periods. */ if (rw == S_CREATE) { while ((mi->mi_max_threads != 0 && rp->r_awcount > 2 * mi->mi_max_threads) || rp->r_gcount > 0) cv_wait(&rp->r_cv, &rp->r_statelock); } /* * If we are getting called as a side effect of an nfs_write() * operation the local file size might not be extended yet. * In this case we want to be able to return pages of zeroes. */ if (off + len > rp->r_size + PAGEOFFSET && seg != segkmap) { mutex_exit(&rp->r_statelock); return (EFAULT); /* beyond EOF */ } mutex_exit(&rp->r_statelock); if (len <= PAGESIZE) { error = nfs_getapage(vp, off, len, protp, pl, plsz, seg, addr, rw, cr); } else { error = pvn_getpages(nfs_getapage, vp, off, len, protp, pl, plsz, seg, addr, rw, cr); } switch (error) { case NFS_EOF: nfs_purge_caches(vp, NFS_NOPURGE_DNLC, cr); goto retry; case ESTALE: PURGE_STALE_FH(error, vp, cr); } return (error); } /* * Called from pvn_getpages or nfs_getpage to get a particular page. */ /* ARGSUSED */ static int nfs_getapage(vnode_t *vp, u_offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, cred_t *cr) { rnode_t *rp; uint_t bsize; struct buf *bp; page_t *pp; u_offset_t lbn; u_offset_t io_off; u_offset_t blkoff; u_offset_t rablkoff; size_t io_len; uint_t blksize; int error; int readahead; int readahead_issued = 0; int ra_window; /* readahead window */ page_t *pagefound; if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); rp = VTOR(vp); bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE); reread: bp = NULL; pp = NULL; pagefound = NULL; if (pl != NULL) pl[0] = NULL; error = 0; lbn = off / bsize; blkoff = lbn * bsize; /* * Queueing up the readahead before doing the synchronous read * results in a significant increase in read throughput because * of the increased parallelism between the async threads and * the process context. */ if ((off & ((vp->v_vfsp->vfs_bsize) - 1)) == 0 && rw != S_CREATE && !(vp->v_flag & VNOCACHE)) { mutex_enter(&rp->r_statelock); /* * Calculate the number of readaheads to do. * a) No readaheads at offset = 0. * b) Do maximum(nfs_nra) readaheads when the readahead * window is closed. * c) Do readaheads between 1 to (nfs_nra - 1) depending * upon how far the readahead window is open or close. * d) No readaheads if rp->r_nextr is not within the scope * of the readahead window (random i/o). */ if (off == 0) readahead = 0; else if (blkoff == rp->r_nextr) readahead = nfs_nra; else if (rp->r_nextr > blkoff && ((ra_window = (rp->r_nextr - blkoff) / bsize) <= (nfs_nra - 1))) readahead = nfs_nra - ra_window; else readahead = 0; rablkoff = rp->r_nextr; while (readahead > 0 && rablkoff + bsize < rp->r_size) { mutex_exit(&rp->r_statelock); if (nfs_async_readahead(vp, rablkoff + bsize, addr + (rablkoff + bsize - off), seg, cr, nfs_readahead) < 0) { mutex_enter(&rp->r_statelock); break; } readahead--; rablkoff += bsize; /* * Indicate that we did a readahead so * readahead offset is not updated * by the synchronous read below. */ readahead_issued = 1; mutex_enter(&rp->r_statelock); /* * set readahead offset to * offset of last async readahead * request. */ rp->r_nextr = rablkoff; } mutex_exit(&rp->r_statelock); } again: if ((pagefound = page_exists(vp, off)) == NULL) { if (pl == NULL) { (void) nfs_async_readahead(vp, blkoff, addr, seg, cr, nfs_readahead); } else if (rw == S_CREATE) { /* * Block for this page is not allocated, or the offset * is beyond the current allocation size, or we're * allocating a swap slot and the page was not found, * so allocate it and return a zero page. */ if ((pp = page_create_va(vp, off, PAGESIZE, PG_WAIT, seg, addr)) == NULL) cmn_err(CE_PANIC, "nfs_getapage: page_create"); io_len = PAGESIZE; mutex_enter(&rp->r_statelock); rp->r_nextr = off + PAGESIZE; mutex_exit(&rp->r_statelock); } else { /* * Need to go to server to get a BLOCK, exception to * that being while reading at offset = 0 or doing * random i/o, in that case read only a PAGE. */ mutex_enter(&rp->r_statelock); if (blkoff < rp->r_size && blkoff + bsize >= rp->r_size) { /* * If only a block or less is left in * the file, read all that is remaining. */ if (rp->r_size <= off) { /* * Trying to access beyond EOF, * set up to get at least one page. */ blksize = off + PAGESIZE - blkoff; } else blksize = rp->r_size - blkoff; } else if ((off == 0) || (off != rp->r_nextr && !readahead_issued)) { blksize = PAGESIZE; blkoff = off; /* block = page here */ } else blksize = bsize; mutex_exit(&rp->r_statelock); pp = pvn_read_kluster(vp, off, seg, addr, &io_off, &io_len, blkoff, blksize, 0); /* * Some other thread has entered the page, * so just use it. */ if (pp == NULL) goto again; /* * Now round the request size up to page boundaries. * This ensures that the entire page will be * initialized to zeroes if EOF is encountered. */ io_len = ptob(btopr(io_len)); bp = pageio_setup(pp, io_len, vp, B_READ); ASSERT(bp != NULL); /* * pageio_setup should have set b_addr to 0. This * is correct since we want to do I/O on a page * boundary. bp_mapin will use this addr to calculate * an offset, and then set b_addr to the kernel virtual * address it allocated for us. */ ASSERT(bp->b_un.b_addr == 0); bp->b_edev = 0; bp->b_dev = 0; bp->b_lblkno = lbtodb(io_off); bp->b_file = vp; bp->b_offset = (offset_t)off; bp_mapin(bp); /* * If doing a write beyond what we believe is EOF, * don't bother trying to read the pages from the * server, we'll just zero the pages here. We * don't check that the rw flag is S_WRITE here * because some implementations may attempt a * read access to the buffer before copying data. */ mutex_enter(&rp->r_statelock); if (io_off >= rp->r_size && seg == segkmap) { mutex_exit(&rp->r_statelock); bzero(bp->b_un.b_addr, io_len); } else { mutex_exit(&rp->r_statelock); error = nfs_bio(bp, cr); } /* * Unmap the buffer before freeing it. */ bp_mapout(bp); pageio_done(bp); if (error == NFS_EOF) { /* * If doing a write system call just return * zeroed pages, else user tried to get pages * beyond EOF, return error. We don't check * that the rw flag is S_WRITE here because * some implementations may attempt a read * access to the buffer before copying data. */ if (seg == segkmap) error = 0; else error = EFAULT; } if (!readahead_issued && !error) { mutex_enter(&rp->r_statelock); rp->r_nextr = io_off + io_len; mutex_exit(&rp->r_statelock); } } } out: if (pl == NULL) return (error); if (error) { if (pp != NULL) pvn_read_done(pp, B_ERROR); return (error); } if (pagefound) { se_t se = (rw == S_CREATE ? SE_EXCL : SE_SHARED); /* * Page exists in the cache, acquire the appropriate lock. * If this fails, start all over again. */ if ((pp = page_lookup(vp, off, se)) == NULL) { #ifdef DEBUG nfs_lostpage++; #endif goto reread; } pl[0] = pp; pl[1] = NULL; return (0); } if (pp != NULL) pvn_plist_init(pp, pl, plsz, off, io_len, rw); return (error); } static void nfs_readahead(vnode_t *vp, u_offset_t blkoff, caddr_t addr, struct seg *seg, cred_t *cr) { int error; page_t *pp; u_offset_t io_off; size_t io_len; struct buf *bp; uint_t bsize, blksize; rnode_t *rp = VTOR(vp); ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE); mutex_enter(&rp->r_statelock); if (blkoff < rp->r_size && blkoff + bsize > rp->r_size) { /* * If less than a block left in file read less * than a block. */ blksize = rp->r_size - blkoff; } else blksize = bsize; mutex_exit(&rp->r_statelock); pp = pvn_read_kluster(vp, blkoff, segkmap, addr, &io_off, &io_len, blkoff, blksize, 1); /* * The isra flag passed to the kluster function is 1, we may have * gotten a return value of NULL for a variety of reasons (# of free * pages < minfree, someone entered the page on the vnode etc). In all * cases, we want to punt on the readahead. */ if (pp == NULL) return; /* * Now round the request size up to page boundaries. * This ensures that the entire page will be * initialized to zeroes if EOF is encountered. */ io_len = ptob(btopr(io_len)); bp = pageio_setup(pp, io_len, vp, B_READ); ASSERT(bp != NULL); /* * pageio_setup should have set b_addr to 0. This is correct since * we want to do I/O on a page boundary. bp_mapin() will use this addr * to calculate an offset, and then set b_addr to the kernel virtual * address it allocated for us. */ ASSERT(bp->b_un.b_addr == 0); bp->b_edev = 0; bp->b_dev = 0; bp->b_lblkno = lbtodb(io_off); bp->b_file = vp; bp->b_offset = (offset_t)blkoff; bp_mapin(bp); /* * If doing a write beyond what we believe is EOF, don't bother trying * to read the pages from the server, we'll just zero the pages here. * We don't check that the rw flag is S_WRITE here because some * implementations may attempt a read access to the buffer before * copying data. */ mutex_enter(&rp->r_statelock); if (io_off >= rp->r_size && seg == segkmap) { mutex_exit(&rp->r_statelock); bzero(bp->b_un.b_addr, io_len); error = 0; } else { mutex_exit(&rp->r_statelock); error = nfs_bio(bp, cr); if (error == NFS_EOF) error = 0; } /* * Unmap the buffer before freeing it. */ bp_mapout(bp); pageio_done(bp); pvn_read_done(pp, error ? B_READ | B_ERROR : B_READ); /* * In case of error set readahead offset * to the lowest offset. * pvn_read_done() calls VN_DISPOSE to destroy the pages */ if (error && rp->r_nextr > io_off) { mutex_enter(&rp->r_statelock); if (rp->r_nextr > io_off) rp->r_nextr = io_off; mutex_exit(&rp->r_statelock); } } /* * Flags are composed of {B_INVAL, B_FREE, B_DONTNEED, B_FORCE} * If len == 0, do from off to EOF. * * The normal cases should be len == 0 && off == 0 (entire vp list), * len == MAXBSIZE (from segmap_release actions), and len == PAGESIZE * (from pageout). */ /* ARGSUSED */ static int nfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr, caller_context_t *ct) { int error; rnode_t *rp; ASSERT(cr != NULL); /* * XXX - Why should this check be made here? */ if (vp->v_flag & VNOMAP) return (ENOSYS); if (len == 0 && !(flags & B_INVAL) && vn_is_readonly(vp)) return (0); if (!(flags & B_ASYNC) && nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); ASSERT(off <= MAXOFF32_T); rp = VTOR(vp); mutex_enter(&rp->r_statelock); rp->r_count++; mutex_exit(&rp->r_statelock); error = nfs_putpages(vp, off, len, flags, cr); mutex_enter(&rp->r_statelock); rp->r_count--; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); return (error); } /* * Write out a single page, possibly klustering adjacent dirty pages. */ int nfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, int flags, cred_t *cr) { u_offset_t io_off; u_offset_t lbn_off; u_offset_t lbn; size_t io_len; uint_t bsize; int error; rnode_t *rp; ASSERT(!vn_is_readonly(vp)); ASSERT(pp != NULL); ASSERT(cr != NULL); ASSERT((flags & B_ASYNC) || nfs_zone() == VTOMI(vp)->mi_zone); rp = VTOR(vp); ASSERT(rp->r_count > 0); ASSERT(pp->p_offset <= MAXOFF32_T); bsize = MAX(vp->v_vfsp->vfs_bsize, PAGESIZE); lbn = pp->p_offset / bsize; lbn_off = lbn * bsize; /* * Find a kluster that fits in one block, or in * one page if pages are bigger than blocks. If * there is less file space allocated than a whole * page, we'll shorten the i/o request below. */ pp = pvn_write_kluster(vp, pp, &io_off, &io_len, lbn_off, roundup(bsize, PAGESIZE), flags); /* * pvn_write_kluster shouldn't have returned a page with offset * behind the original page we were given. Verify that. */ ASSERT((pp->p_offset / bsize) >= lbn); /* * Now pp will have the list of kept dirty pages marked for * write back. It will also handle invalidation and freeing * of pages that are not dirty. Check for page length rounding * problems. */ if (io_off + io_len > lbn_off + bsize) { ASSERT((io_off + io_len) - (lbn_off + bsize) < PAGESIZE); io_len = lbn_off + bsize - io_off; } /* * The RMODINPROGRESS flag makes sure that nfs(3)_bio() sees a * consistent value of r_size. RMODINPROGRESS is set in writerp(). * When RMODINPROGRESS is set it indicates that a uiomove() is in * progress and the r_size has not been made consistent with the * new size of the file. When the uiomove() completes the r_size is * updated and the RMODINPROGRESS flag is cleared. * * The RMODINPROGRESS flag makes sure that nfs(3)_bio() sees a * consistent value of r_size. Without this handshaking, it is * possible that nfs(3)_bio() picks up the old value of r_size * before the uiomove() in writerp() completes. This will result * in the write through nfs(3)_bio() being dropped. * * More precisely, there is a window between the time the uiomove() * completes and the time the r_size is updated. If a VOP_PUTPAGE() * operation intervenes in this window, the page will be picked up, * because it is dirty (it will be unlocked, unless it was * pagecreate'd). When the page is picked up as dirty, the dirty * bit is reset (pvn_getdirty()). In nfs(3)write(), r_size is * checked. This will still be the old size. Therefore the page will * not be written out. When segmap_release() calls VOP_PUTPAGE(), * the page will be found to be clean and the write will be dropped. */ if (rp->r_flags & RMODINPROGRESS) { mutex_enter(&rp->r_statelock); if ((rp->r_flags & RMODINPROGRESS) && rp->r_modaddr + MAXBSIZE > io_off && rp->r_modaddr < io_off + io_len) { page_t *plist; /* * A write is in progress for this region of the file. * If we did not detect RMODINPROGRESS here then this * path through nfs_putapage() would eventually go to * nfs(3)_bio() and may not write out all of the data * in the pages. We end up losing data. So we decide * to set the modified bit on each page in the page * list and mark the rnode with RDIRTY. This write * will be restarted at some later time. */ plist = pp; while (plist != NULL) { pp = plist; page_sub(&plist, pp); hat_setmod(pp); page_io_unlock(pp); page_unlock(pp); } rp->r_flags |= RDIRTY; mutex_exit(&rp->r_statelock); if (offp) *offp = io_off; if (lenp) *lenp = io_len; return (0); } mutex_exit(&rp->r_statelock); } if (flags & B_ASYNC) { error = nfs_async_putapage(vp, pp, io_off, io_len, flags, cr, nfs_sync_putapage); } else error = nfs_sync_putapage(vp, pp, io_off, io_len, flags, cr); if (offp) *offp = io_off; if (lenp) *lenp = io_len; return (error); } static int nfs_sync_putapage(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags, cred_t *cr) { int error; rnode_t *rp; flags |= B_WRITE; ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr); rp = VTOR(vp); if ((error == ENOSPC || error == EDQUOT || error == EACCES) && (flags & (B_INVAL|B_FORCE)) != (B_INVAL|B_FORCE)) { if (!(rp->r_flags & ROUTOFSPACE)) { mutex_enter(&rp->r_statelock); rp->r_flags |= ROUTOFSPACE; mutex_exit(&rp->r_statelock); } flags |= B_ERROR; pvn_write_done(pp, flags); /* * If this was not an async thread, then try again to * write out the pages, but this time, also destroy * them whether or not the write is successful. This * will prevent memory from filling up with these * pages and destroying them is the only alternative * if they can't be written out. * * Don't do this if this is an async thread because * when the pages are unlocked in pvn_write_done, * some other thread could have come along, locked * them, and queued for an async thread. It would be * possible for all of the async threads to be tied * up waiting to lock the pages again and they would * all already be locked and waiting for an async * thread to handle them. Deadlock. */ if (!(flags & B_ASYNC)) { error = nfs_putpage(vp, io_off, io_len, B_INVAL | B_FORCE, cr, NULL); } } else { if (error) flags |= B_ERROR; else if (rp->r_flags & ROUTOFSPACE) { mutex_enter(&rp->r_statelock); rp->r_flags &= ~ROUTOFSPACE; mutex_exit(&rp->r_statelock); } pvn_write_done(pp, flags); } return (error); } /* ARGSUSED */ static int nfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, caller_context_t *ct) { struct segvn_crargs vn_a; int error; rnode_t *rp; struct vattr va; if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); if (vp->v_flag & VNOMAP) return (ENOSYS); if (off > MAXOFF32_T) return (EFBIG); if (off < 0 || off + len < 0) return (ENXIO); if (vp->v_type != VREG) return (ENODEV); /* * If there is cached data and if close-to-open consistency * checking is not turned off and if the file system is not * mounted readonly, then force an over the wire getattr. * Otherwise, just invoke nfsgetattr to get a copy of the * attributes. The attribute cache will be used unless it * is timed out and if it is, then an over the wire getattr * will be issued. */ va.va_mask = AT_ALL; if (vn_has_cached_data(vp) && !(VTOMI(vp)->mi_flags & MI_NOCTO) && !vn_is_readonly(vp)) error = nfs_getattr_otw(vp, &va, cr); else error = nfsgetattr(vp, &va, cr); if (error) return (error); /* * Check to see if the vnode is currently marked as not cachable. * This means portions of the file are locked (through VOP_FRLOCK). * In this case the map request must be refused. We use * rp->r_lkserlock to avoid a race with concurrent lock requests. */ rp = VTOR(vp); if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_READER, INTR(vp))) return (EINTR); if (vp->v_flag & VNOCACHE) { error = EAGAIN; goto done; } /* * Don't allow concurrent locks and mapping if mandatory locking is * enabled. */ if ((flk_has_remote_locks(vp) || lm_has_sleep(vp)) && MANDLOCK(vp, va.va_mode)) { error = EAGAIN; goto done; } as_rangelock(as); error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); if (error != 0) { as_rangeunlock(as); goto done; } vn_a.vp = vp; vn_a.offset = off; vn_a.type = (flags & MAP_TYPE); vn_a.prot = (uchar_t)prot; vn_a.maxprot = (uchar_t)maxprot; vn_a.flags = (flags & ~MAP_TYPE); vn_a.cred = cr; vn_a.amp = NULL; vn_a.szc = 0; vn_a.lgrp_mem_policy_flags = 0; error = as_map(as, *addrp, len, segvn_create, &vn_a); as_rangeunlock(as); done: nfs_rw_exit(&rp->r_lkserlock); return (error); } /* ARGSUSED */ static int nfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, caller_context_t *ct) { rnode_t *rp; if (vp->v_flag & VNOMAP) return (ENOSYS); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* * Need to hold rwlock while incrementing the mapcnt so that * mmap'ing can be serialized with writes so that the caching * can be handled correctly. */ rp = VTOR(vp); if (nfs_rw_enter_sig(&rp->r_rwlock, RW_WRITER, INTR(vp))) return (EINTR); atomic_add_long((ulong_t *)&rp->r_mapcnt, btopr(len)); nfs_rw_exit(&rp->r_rwlock); return (0); } /* ARGSUSED */ static int nfs_frlock(vnode_t *vp, int cmd, struct flock64 *bfp, int flag, offset_t offset, struct flk_callback *flk_cbp, cred_t *cr, caller_context_t *ct) { netobj lm_fh; int rc; u_offset_t start, end; rnode_t *rp; int error = 0, intr = INTR(vp); /* check for valid cmd parameter */ if (cmd != F_GETLK && cmd != F_SETLK && cmd != F_SETLKW) return (EINVAL); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* Verify l_type. */ switch (bfp->l_type) { case F_RDLCK: if (cmd != F_GETLK && !(flag & FREAD)) return (EBADF); break; case F_WRLCK: if (cmd != F_GETLK && !(flag & FWRITE)) return (EBADF); break; case F_UNLCK: intr = 0; break; default: return (EINVAL); } /* check the validity of the lock range */ if (rc = flk_convert_lock_data(vp, bfp, &start, &end, offset)) return (rc); if (rc = flk_check_lock_data(start, end, MAXOFF32_T)) return (rc); /* * If the filesystem is mounted using local locking, pass the * request off to the local locking code. */ if (VTOMI(vp)->mi_flags & MI_LLOCK) { if (offset > MAXOFF32_T) return (EFBIG); if (cmd == F_SETLK || cmd == F_SETLKW) { /* * For complete safety, we should be holding * r_lkserlock. However, we can't call * lm_safelock and then fs_frlock while * holding r_lkserlock, so just invoke * lm_safelock and expect that this will * catch enough of the cases. */ if (!lm_safelock(vp, bfp, cr)) return (EAGAIN); } return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct)); } rp = VTOR(vp); /* * Check whether the given lock request can proceed, given the * current file mappings. */ if (nfs_rw_enter_sig(&rp->r_lkserlock, RW_WRITER, intr)) return (EINTR); if (cmd == F_SETLK || cmd == F_SETLKW) { if (!lm_safelock(vp, bfp, cr)) { rc = EAGAIN; goto done; } } /* * Flush the cache after waiting for async I/O to finish. For new * locks, this is so that the process gets the latest bits from the * server. For unlocks, this is so that other clients see the * latest bits once the file has been unlocked. If currently dirty * pages can't be flushed, then don't allow a lock to be set. But * allow unlocks to succeed, to avoid having orphan locks on the * server. */ if (cmd != F_GETLK) { mutex_enter(&rp->r_statelock); while (rp->r_count > 0) { if (intr) { klwp_t *lwp = ttolwp(curthread); if (lwp != NULL) lwp->lwp_nostop++; if (cv_wait_sig(&rp->r_cv, &rp->r_statelock) == 0) { if (lwp != NULL) lwp->lwp_nostop--; rc = EINTR; break; } if (lwp != NULL) lwp->lwp_nostop--; } else cv_wait(&rp->r_cv, &rp->r_statelock); } mutex_exit(&rp->r_statelock); if (rc != 0) goto done; error = nfs_putpage(vp, (offset_t)0, 0, B_INVAL, cr, ct); if (error) { if (error == ENOSPC || error == EDQUOT) { mutex_enter(&rp->r_statelock); if (!rp->r_error) rp->r_error = error; mutex_exit(&rp->r_statelock); } if (bfp->l_type != F_UNLCK) { rc = ENOLCK; goto done; } } } lm_fh.n_len = sizeof (fhandle_t); lm_fh.n_bytes = (char *)VTOFH(vp); /* * Call the lock manager to do the real work of contacting * the server and obtaining the lock. */ rc = lm_frlock(vp, cmd, bfp, flag, offset, cr, &lm_fh, flk_cbp); if (rc == 0) nfs_lockcompletion(vp, cmd); done: nfs_rw_exit(&rp->r_lkserlock); return (rc); } /* * Free storage space associated with the specified vnode. The portion * to be freed is specified by bfp->l_start and bfp->l_len (already * normalized to a "whence" of 0). * * This is an experimental facility whose continued existence is not * guaranteed. Currently, we only support the special case * of l_len == 0, meaning free to end of file. */ /* ARGSUSED */ static int nfs_space(vnode_t *vp, int cmd, struct flock64 *bfp, int flag, offset_t offset, cred_t *cr, caller_context_t *ct) { int error; ASSERT(vp->v_type == VREG); if (cmd != F_FREESP) return (EINVAL); if (offset > MAXOFF32_T) return (EFBIG); if ((bfp->l_start > MAXOFF32_T) || (bfp->l_end > MAXOFF32_T) || (bfp->l_len > MAXOFF32_T)) return (EFBIG); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); error = convoff(vp, bfp, 0, offset); if (!error) { ASSERT(bfp->l_start >= 0); if (bfp->l_len == 0) { struct vattr va; /* * ftruncate should not change the ctime and * mtime if we truncate the file to its * previous size. */ va.va_mask = AT_SIZE; error = nfsgetattr(vp, &va, cr); if (error || va.va_size == bfp->l_start) return (error); va.va_mask = AT_SIZE; va.va_size = bfp->l_start; error = nfssetattr(vp, &va, 0, cr); } else error = EINVAL; } return (error); } /* ARGSUSED */ static int nfs_realvp(vnode_t *vp, vnode_t **vpp, caller_context_t *ct) { return (EINVAL); } /* * Setup and add an address space callback to do the work of the delmap call. * The callback will (and must be) deleted in the actual callback function. * * This is done in order to take care of the problem that we have with holding * the address space's a_lock for a long period of time (e.g. if the NFS server * is down). Callbacks will be executed in the address space code while the * a_lock is not held. Holding the address space's a_lock causes things such * as ps and fork to hang because they are trying to acquire this lock as well. */ /* ARGSUSED */ static int nfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr, caller_context_t *ct) { int caller_found; int error; rnode_t *rp; nfs_delmap_args_t *dmapp; nfs_delmapcall_t *delmap_call; if (vp->v_flag & VNOMAP) return (ENOSYS); /* * A process may not change zones if it has NFS pages mmap'ed * in, so we can't legitimately get here from the wrong zone. */ ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); rp = VTOR(vp); /* * The way that the address space of this process deletes its mapping * of this file is via the following call chains: * - as_free()->SEGOP_UNMAP()/segvn_unmap()->VOP_DELMAP()/nfs_delmap() * - as_unmap()->SEGOP_UNMAP()/segvn_unmap()->VOP_DELMAP()/nfs_delmap() * * With the use of address space callbacks we are allowed to drop the * address space lock, a_lock, while executing the NFS operations that * need to go over the wire. Returning EAGAIN to the caller of this * function is what drives the execution of the callback that we add * below. The callback will be executed by the address space code * after dropping the a_lock. When the callback is finished, since * we dropped the a_lock, it must be re-acquired and segvn_unmap() * is called again on the same segment to finish the rest of the work * that needs to happen during unmapping. * * This action of calling back into the segment driver causes * nfs_delmap() to get called again, but since the callback was * already executed at this point, it already did the work and there * is nothing left for us to do. * * To Summarize: * - The first time nfs_delmap is called by the current thread is when * we add the caller associated with this delmap to the delmap caller * list, add the callback, and return EAGAIN. * - The second time in this call chain when nfs_delmap is called we * will find this caller in the delmap caller list and realize there * is no more work to do thus removing this caller from the list and * returning the error that was set in the callback execution. */ caller_found = nfs_find_and_delete_delmapcall(rp, &error); if (caller_found) { /* * 'error' is from the actual delmap operations. To avoid * hangs, we need to handle the return of EAGAIN differently * since this is what drives the callback execution. * In this case, we don't want to return EAGAIN and do the * callback execution because there are none to execute. */ if (error == EAGAIN) return (0); else return (error); } /* current caller was not in the list */ delmap_call = nfs_init_delmapcall(); mutex_enter(&rp->r_statelock); list_insert_tail(&rp->r_indelmap, delmap_call); mutex_exit(&rp->r_statelock); dmapp = kmem_alloc(sizeof (nfs_delmap_args_t), KM_SLEEP); dmapp->vp = vp; dmapp->off = off; dmapp->addr = addr; dmapp->len = len; dmapp->prot = prot; dmapp->maxprot = maxprot; dmapp->flags = flags; dmapp->cr = cr; dmapp->caller = delmap_call; error = as_add_callback(as, nfs_delmap_callback, dmapp, AS_UNMAP_EVENT, addr, len, KM_SLEEP); return (error ? error : EAGAIN); } /* * Remove some pages from an mmap'd vnode. Just update the * count of pages. If doing close-to-open, then flush all * of the pages associated with this file. Otherwise, start * an asynchronous page flush to write out any dirty pages. * This will also associate a credential with the rnode which * can be used to write the pages. */ /* ARGSUSED */ static void nfs_delmap_callback(struct as *as, void *arg, uint_t event) { int error; rnode_t *rp; mntinfo_t *mi; nfs_delmap_args_t *dmapp = (nfs_delmap_args_t *)arg; rp = VTOR(dmapp->vp); mi = VTOMI(dmapp->vp); atomic_add_long((ulong_t *)&rp->r_mapcnt, -btopr(dmapp->len)); ASSERT(rp->r_mapcnt >= 0); /* * Initiate a page flush if there are pages, the file system * was not mounted readonly, the segment was mapped shared, and * the pages themselves were writeable. */ if (vn_has_cached_data(dmapp->vp) && !vn_is_readonly(dmapp->vp) && dmapp->flags == MAP_SHARED && (dmapp->maxprot & PROT_WRITE)) { mutex_enter(&rp->r_statelock); rp->r_flags |= RDIRTY; mutex_exit(&rp->r_statelock); /* * If this is a cross-zone access a sync putpage won't work, so * the best we can do is try an async putpage. That seems * better than something more draconian such as discarding the * dirty pages. */ if ((mi->mi_flags & MI_NOCTO) || nfs_zone() != mi->mi_zone) error = nfs_putpage(dmapp->vp, dmapp->off, dmapp->len, B_ASYNC, dmapp->cr, NULL); else error = nfs_putpage(dmapp->vp, dmapp->off, dmapp->len, 0, dmapp->cr, NULL); if (!error) { mutex_enter(&rp->r_statelock); error = rp->r_error; rp->r_error = 0; mutex_exit(&rp->r_statelock); } } else error = 0; if ((rp->r_flags & RDIRECTIO) || (mi->mi_flags & MI_DIRECTIO)) (void) nfs_putpage(dmapp->vp, dmapp->off, dmapp->len, B_INVAL, dmapp->cr, NULL); dmapp->caller->error = error; (void) as_delete_callback(as, arg); kmem_free(dmapp, sizeof (nfs_delmap_args_t)); } /* ARGSUSED */ static int nfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, caller_context_t *ct) { int error = 0; if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* * This looks a little weird because it's written in a general * manner but we make little use of cases. If cntl() ever gets * widely used, the outer switch will make more sense. */ switch (cmd) { /* * Large file spec - need to base answer new query with * hardcoded constant based on the protocol. */ case _PC_FILESIZEBITS: *valp = 32; return (0); case _PC_LINK_MAX: case _PC_NAME_MAX: case _PC_PATH_MAX: case _PC_SYMLINK_MAX: case _PC_CHOWN_RESTRICTED: case _PC_NO_TRUNC: { mntinfo_t *mi; struct pathcnf *pc; if ((mi = VTOMI(vp)) == NULL || (pc = mi->mi_pathconf) == NULL) return (EINVAL); error = _PC_ISSET(cmd, pc->pc_mask); /* error or bool */ switch (cmd) { case _PC_LINK_MAX: *valp = pc->pc_link_max; break; case _PC_NAME_MAX: *valp = pc->pc_name_max; break; case _PC_PATH_MAX: case _PC_SYMLINK_MAX: *valp = pc->pc_path_max; break; case _PC_CHOWN_RESTRICTED: /* * if we got here, error is really a boolean which * indicates whether cmd is set or not. */ *valp = error ? 1 : 0; /* see above */ error = 0; break; case _PC_NO_TRUNC: /* * if we got here, error is really a boolean which * indicates whether cmd is set or not. */ *valp = error ? 1 : 0; /* see above */ error = 0; break; } return (error ? EINVAL : 0); } case _PC_XATTR_EXISTS: *valp = 0; if (vp->v_vfsp->vfs_flag & VFS_XATTR) { vnode_t *avp; rnode_t *rp; mntinfo_t *mi = VTOMI(vp); if (!(mi->mi_flags & MI_EXTATTR)) return (0); rp = VTOR(vp); if (nfs_rw_enter_sig(&rp->r_rwlock, RW_READER, INTR(vp))) return (EINTR); error = nfslookup_dnlc(vp, XATTR_DIR_NAME, &avp, cr); if (error || avp == NULL) error = acl_getxattrdir2(vp, &avp, 0, cr, 0); nfs_rw_exit(&rp->r_rwlock); if (error == 0 && avp != NULL) { error = do_xattr_exists_check(avp, valp, cr); VN_RELE(avp); } } return (error ? EINVAL : 0); case _PC_ACL_ENABLED: *valp = _ACL_ACLENT_ENABLED; return (0); default: return (EINVAL); } } /* * Called by async thread to do synchronous pageio. Do the i/o, wait * for it to complete, and cleanup the page list when done. */ static int nfs_sync_pageio(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags, cred_t *cr) { int error; ASSERT(nfs_zone() == VTOMI(vp)->mi_zone); error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr); if (flags & B_READ) pvn_read_done(pp, (error ? B_ERROR : 0) | flags); else pvn_write_done(pp, (error ? B_ERROR : 0) | flags); return (error); } /* ARGSUSED */ static int nfs_pageio(vnode_t *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags, cred_t *cr, caller_context_t *ct) { int error; rnode_t *rp; if (pp == NULL) return (EINVAL); if (io_off > MAXOFF32_T) return (EFBIG); if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); rp = VTOR(vp); mutex_enter(&rp->r_statelock); rp->r_count++; mutex_exit(&rp->r_statelock); if (flags & B_ASYNC) { error = nfs_async_pageio(vp, pp, io_off, io_len, flags, cr, nfs_sync_pageio); } else error = nfs_rdwrlbn(vp, pp, io_off, io_len, flags, cr); mutex_enter(&rp->r_statelock); rp->r_count--; cv_broadcast(&rp->r_cv); mutex_exit(&rp->r_statelock); return (error); } /* ARGSUSED */ static int nfs_setsecattr(vnode_t *vp, vsecattr_t *vsecattr, int flag, cred_t *cr, caller_context_t *ct) { int error; mntinfo_t *mi; mi = VTOMI(vp); if (nfs_zone() != mi->mi_zone) return (EIO); if (mi->mi_flags & MI_ACL) { error = acl_setacl2(vp, vsecattr, flag, cr); if (mi->mi_flags & MI_ACL) return (error); } return (ENOSYS); } /* ARGSUSED */ static int nfs_getsecattr(vnode_t *vp, vsecattr_t *vsecattr, int flag, cred_t *cr, caller_context_t *ct) { int error; mntinfo_t *mi; mi = VTOMI(vp); if (nfs_zone() != mi->mi_zone) return (EIO); if (mi->mi_flags & MI_ACL) { error = acl_getacl2(vp, vsecattr, flag, cr); if (mi->mi_flags & MI_ACL) return (error); } return (fs_fab_acl(vp, vsecattr, flag, cr, ct)); } /* ARGSUSED */ static int nfs_shrlock(vnode_t *vp, int cmd, struct shrlock *shr, int flag, cred_t *cr, caller_context_t *ct) { int error; struct shrlock nshr; struct nfs_owner nfs_owner; netobj lm_fh; if (nfs_zone() != VTOMI(vp)->mi_zone) return (EIO); /* * check for valid cmd parameter */ if (cmd != F_SHARE && cmd != F_UNSHARE && cmd != F_HASREMOTELOCKS) return (EINVAL); /* * Check access permissions */ if (cmd == F_SHARE && (((shr->s_access & F_RDACC) && !(flag & FREAD)) || ((shr->s_access & F_WRACC) && !(flag & FWRITE)))) return (EBADF); /* * If the filesystem is mounted using local locking, pass the * request off to the local share code. */ if (VTOMI(vp)->mi_flags & MI_LLOCK) return (fs_shrlock(vp, cmd, shr, flag, cr, ct)); switch (cmd) { case F_SHARE: case F_UNSHARE: lm_fh.n_len = sizeof (fhandle_t); lm_fh.n_bytes = (char *)VTOFH(vp); /* * If passed an owner that is too large to fit in an * nfs_owner it is likely a recursive call from the * lock manager client and pass it straight through. If * it is not a nfs_owner then simply return an error. */ if (shr->s_own_len > sizeof (nfs_owner.lowner)) { if (((struct nfs_owner *)shr->s_owner)->magic != NFS_OWNER_MAGIC) return (EINVAL); if (error = lm_shrlock(vp, cmd, shr, flag, &lm_fh)) { error = set_errno(error); } return (error); } /* * Remote share reservations owner is a combination of * a magic number, hostname, and the local owner */ bzero(&nfs_owner, sizeof (nfs_owner)); nfs_owner.magic = NFS_OWNER_MAGIC; (void) strncpy(nfs_owner.hname, uts_nodename(), sizeof (nfs_owner.hname)); bcopy(shr->s_owner, nfs_owner.lowner, shr->s_own_len); nshr.s_access = shr->s_access; nshr.s_deny = shr->s_deny; nshr.s_sysid = 0; nshr.s_pid = ttoproc(curthread)->p_pid; nshr.s_own_len = sizeof (nfs_owner); nshr.s_owner = (caddr_t)&nfs_owner; if (error = lm_shrlock(vp, cmd, &nshr, flag, &lm_fh)) { error = set_errno(error); } break; case F_HASREMOTELOCKS: /* * NFS client can't store remote locks itself */ shr->s_access = 0; error = 0; break; default: error = EINVAL; break; } return (error); }