diff options
Diffstat (limited to 'usr/src/uts/common/nfs/rnode4.h')
| -rw-r--r-- | usr/src/uts/common/nfs/rnode4.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/usr/src/uts/common/nfs/rnode4.h b/usr/src/uts/common/nfs/rnode4.h index 7827e24679..7f4c705698 100644 --- a/usr/src/uts/common/nfs/rnode4.h +++ b/usr/src/uts/common/nfs/rnode4.h @@ -19,7 +19,7 @@ * CDDL HEADER END */ /* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ @@ -29,8 +29,6 @@ #ifndef _NFS_RNODE4_H #define _NFS_RNODE4_H -#pragma ident "%Z%%M% %I% %E% SMI" - #ifdef __cplusplus extern "C" { #endif @@ -200,6 +198,16 @@ typedef struct r4hashq { * set r_modaddr and release r_statelock as long as the r_rwlock * writer lock is held. * + * r_inmap informs nfs4_read()/write() that there is a call to nfs4_map() + * in progress. nfs4_read()/write() check r_inmap to decide whether + * to perform directio on the file or not. r_inmap is atomically + * incremented in nfs4_map() before the address space routines are + * called and atomically decremented just before nfs4_map() exits. + * r_inmap is not protected by any lock. + * + * r_mapcnt tells that the rnode has mapped pages. r_inmap can be 0 + * while the rnode has mapped pages. + * * 64-bit offsets: the code formerly assumed that atomic reads of * r_size were safe and reliable; on 32-bit architectures, this is * not true since an intervening bus cycle from another processor @@ -326,6 +334,7 @@ typedef struct rnode4 { /* stub type was set */ nfs4_stub_type_t r_stub_type; /* e.g. mirror-mount */ + uint_t r_inmap; /* to serialize read/write and mmap */ } rnode4_t; #define r_vnode r_svnode.sv_r_vnode |