Added "flags" argument to msync, and implemented MS_ASYNC and MS_INVALIDATE.
The MS_ASYNC flag doesn't current work, and MS_INVALIDATE will only toss out the pages in the address space (not all pages in the shadow chain).
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=7360
@ -38,7 +38,7 @@
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* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
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*
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* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
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* $Id: vm_mmap.c,v 1.17 1995/03/21 10:15:52 davidg Exp $
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* $Id: vm_mmap.c,v 1.18 1995/03/22 05:08:41 davidg Exp $
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*/
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/*
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@ -304,6 +304,7 @@ ommap(p, uap, retval)
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struct msync_args {
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caddr_t addr;
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int len;
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int flags;
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};
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int
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msync(p, uap, retval)
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@ -313,9 +314,9 @@ msync(p, uap, retval)
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{
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vm_offset_t addr;
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vm_size_t size;
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int flags;
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vm_map_t map;
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int rv;
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boolean_t syncio, invalidate;
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#ifdef DEBUG
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if (mmapdebug & (MDB_FOLLOW | MDB_SYNC))
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@ -327,6 +328,8 @@ msync(p, uap, retval)
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map = &p->p_vmspace->vm_map;
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addr = (vm_offset_t) uap->addr;
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size = (vm_size_t) uap->len;
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flags = uap->flags;
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/*
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* XXX Gak! If size is zero we are supposed to sync "all modified
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* pages with the region containing addr". Unfortunately, we don't
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@ -345,26 +348,19 @@ msync(p, uap, retval)
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addr = entry->start;
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size = entry->end - entry->start;
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}
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#ifdef DEBUG
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if (mmapdebug & MDB_SYNC)
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printf("msync: cleaning/flushing address range [%x-%x)\n",
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addr, addr + size);
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#endif
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/*
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* Could pass this in as a third flag argument to implement Sun's
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* MS_ASYNC.
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*/
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syncio = TRUE;
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/*
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* XXX bummer, gotta flush all cached pages to ensure consistency with
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* the file system cache. Otherwise, we could pass this in to
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* implement Sun's MS_INVALIDATE.
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*/
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invalidate = TRUE;
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/*
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* Clean the pages and interpret the return value.
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*/
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rv = vm_map_clean(map, addr, addr + size, syncio, invalidate);
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rv = vm_map_clean(map, addr, addr + size, (flags & MS_ASYNC) != 0,
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(flags & MS_INVALIDATE) != 0);
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switch (rv) {
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case KERN_SUCCESS:
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break;
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@ -375,6 +371,7 @@ msync(p, uap, retval)
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default:
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return (EINVAL);
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}
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return (0);
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}
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