1/*
2 * Copyright (c) 1994,1997 John S. Dyson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Absolutely no warranty of function or purpose is made by the author
12 * John S. Dyson.
13 *
14 * $FreeBSD: head/sys/kern/vfs_bio.c 103281 2002-09-13 11:28:31Z phk $
15 */
16
17/*
18 * this file contains a new buffer I/O scheme implementing a coherent
19 * VM object and buffer cache scheme. Pains have been taken to make
20 * sure that the performance degradation associated with schemes such
21 * as this is not realized.
22 *
--- 1183 unchanged lines hidden (view full) ---
1206 * Normally we can do this whether a buffer is B_DELWRI or not. If
1207 * the buffer is an NFS buffer, it is tracking piecemeal writes or
1208 * the commit state and we cannot afford to lose the buffer. If the
1209 * buffer has a background write in progress, we need to keep it
1210 * around to prevent it from being reconstituted and starting a second
1211 * background write.
1212 */
1213 if ((bp->b_flags & B_VMIO)
1214 && !(bp->b_vp->v_tag == VT_NFS &&
1215 !vn_isdisk(bp->b_vp, NULL) &&
1216 (bp->b_flags & B_DELWRI))
1217 ) {
1218
1219 int i, j, resid;
1220 vm_page_t m;
1221 off_t foff;
1222 vm_pindex_t poff;
--- 2250 unchanged lines hidden ---
2 * Copyright (c) 1994,1997 John S. Dyson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Absolutely no warranty of function or purpose is made by the author
12 * John S. Dyson.
13 *
14 * $FreeBSD: head/sys/kern/vfs_bio.c 103281 2002-09-13 11:28:31Z phk $
15 */
16
17/*
18 * this file contains a new buffer I/O scheme implementing a coherent
19 * VM object and buffer cache scheme. Pains have been taken to make
20 * sure that the performance degradation associated with schemes such
21 * as this is not realized.
22 *
--- 1183 unchanged lines hidden (view full) ---
1206 * Normally we can do this whether a buffer is B_DELWRI or not. If
1207 * the buffer is an NFS buffer, it is tracking piecemeal writes or
1208 * the commit state and we cannot afford to lose the buffer. If the
1209 * buffer has a background write in progress, we need to keep it
1210 * around to prevent it from being reconstituted and starting a second
1211 * background write.
1212 */
1213 if ((bp->b_flags & B_VMIO)
1214 && !(bp->b_vp->v_tag == VT_NFS &&
1215 !vn_isdisk(bp->b_vp, NULL) &&
1216 (bp->b_flags & B_DELWRI))
1217 ) {
1218
1219 int i, j, resid;
1220 vm_page_t m;
1221 off_t foff;
1222 vm_pindex_t poff;
--- 2250 unchanged lines hidden ---