diff options
Diffstat (limited to 'sys/kern/vfs_vnops.c')
| -rw-r--r-- | sys/kern/vfs_vnops.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index d367340..c8f832f 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -7,6 +7,12 @@ * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * + * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> + * Copyright (c) 2013 The FreeBSD Foundation + * + * Portions of this software were developed by Konstantin Belousov + * under sponsorship from the FreeBSD Foundation. + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -1122,6 +1128,45 @@ vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio) return (error); } +int +vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize, + struct uio *uio) +{ + struct thread *td; + vm_offset_t iov_base; + int cnt, pgadv; + + td = curthread; + if ((td->td_pflags & TDP_UIOHELD) == 0 || + uio->uio_segflg != UIO_USERSPACE) + return (uiomove_fromphys(ma, offset, xfersize, uio)); + + KASSERT(uio->uio_iovcnt == 1, ("uio_iovcnt %d", uio->uio_iovcnt)); + cnt = xfersize > uio->uio_resid ? uio->uio_resid : xfersize; + iov_base = (vm_offset_t)uio->uio_iov->iov_base; + switch (uio->uio_rw) { + case UIO_WRITE: + pmap_copy_pages(td->td_ma, iov_base & PAGE_MASK, ma, + offset, cnt); + break; + case UIO_READ: + pmap_copy_pages(ma, offset, td->td_ma, iov_base & PAGE_MASK, + cnt); + break; + } + pgadv = ((iov_base + cnt) >> PAGE_SHIFT) - (iov_base >> PAGE_SHIFT); + td->td_ma += pgadv; + KASSERT(td->td_ma_cnt >= pgadv, ("consumed pages %d %d", td->td_ma_cnt, + pgadv)); + td->td_ma_cnt -= pgadv; + uio->uio_iov->iov_base = (char *)(iov_base + cnt); + uio->uio_iov->iov_len -= cnt; + uio->uio_resid -= cnt; + uio->uio_offset += cnt; + return (0); +} + + /* * File table truncate routine. */ |
