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/*
* 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 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/cred.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/pathname.h>
#include <sys/uio.h>
#include <sys/tiuser.h>
#include <sys/sysmacros.h>
#include <sys/kmem.h>
#include <netinet/in.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <sys/statvfs.h>
#include <sys/errno.h>
#include <sys/debug.h>
#include <sys/cmn_err.h>
#include <sys/utsname.h>
#include <sys/bootconf.h>
#include <sys/modctl.h>
#include <vm/hat.h>
#include <vm/as.h>
#include <vm/page.h>
#include <vm/pvn.h>
#include <vm/seg.h>
#include <vm/seg_map.h>
#include <vm/seg_vn.h>
#include <vm/rm.h>
#include <sys/fs/cachefs_fs.h>
#define C_CACHE_VALID(TOKEN_MTIME, NEW_MTIME) \
((TOKEN_MTIME.tv_sec == NEW_MTIME.tv_sec) && \
(TOKEN_MTIME.tv_nsec == NEW_MTIME.tv_nsec))
static int
c_cod_init_cached_object(fscache_t *fscp, cnode_t *cp, vattr_t *vap,
cred_t *cr)
{
int error;
cachefs_metadata_t *mdp = &cp->c_metadata;
ASSERT(cr != NULL);
ASSERT(MUTEX_HELD(&cp->c_statelock));
/* NFSv4 option sets strict consistency */
ASSERT(CFS_ISFS_BACKFS_NFSV4(fscp) == 0);
/* if attributes not passed in then get them */
if (vap == NULL) {
/* if not connected then cannot get attrs */
if ((fscp->fs_cdconnected != CFS_CD_CONNECTED) ||
(fscp->fs_backvfsp == NULL))
return (ETIMEDOUT);
/* get backvp if necessary */
if (cp->c_backvp == NULL) {
error = cachefs_getbackvp(fscp, cp);
if (error)
return (error);
}
/* get the attributes */
cp->c_attr.va_mask = AT_ALL;
error = VOP_GETATTR(cp->c_backvp, &cp->c_attr, 0, cr, NULL);
if (error)
return (error);
} else {
/* copy passed in attributes into the cnode */
cp->c_attr = *vap;
}
cp->c_size = cp->c_attr.va_size;
mdp->md_x_time = fscp->fs_cod_time;
mdp->md_consttype = CFS_FS_CONST_CODCONST;
cp->c_flags |= CN_UPDATED;
return (0);
}
static int
c_cod_check_cached_object(struct fscache *fscp, struct cnode *cp,
int verify_what, cred_t *cr)
{
struct vattr attrs;
int fail = 0, backhit = 0;
int error = 0;
cachefs_metadata_t *mdp = &cp->c_metadata;
#ifdef CFSDEBUG
CFS_DEBUG(CFSDEBUG_VOPS)
printf("c_cod_check_cached_object: ENTER cp %p\n", cp);
#endif
ASSERT(cr);
ASSERT(MUTEX_HELD(&cp->c_statelock));
/* nothing to do if not connected */
if ((fscp->fs_cdconnected != CFS_CD_CONNECTED) ||
(fscp->fs_backvfsp == NULL))
goto out;
/* done if do not have to check and cod button has not been pushed */
if (((verify_what & C_BACK_CHECK) == 0) &&
(C_CACHE_VALID(mdp->md_x_time, fscp->fs_cod_time)) &&
((mdp->md_flags & MD_NEEDATTRS) == 0))
goto out;
/* get backvp if necessary */
if (cp->c_backvp == NULL) {
error = cachefs_getbackvp(fscp, cp);
if (error)
goto out;
}
/*
* If the cnode is being populated, and we're not the populating
* thread, then block until the pop thread completes. If we are the
* pop thread, then we may come in here, but not to nuke the directory
* cnode at a critical juncture.
*/
again:
while ((cp->c_flags & CN_ASYNC_POP_WORKING) &&
(cp->c_popthrp != curthread)) {
cv_wait(&cp->c_popcv, &cp->c_statelock);
/*
* recheck backvp and connectivity - if backvp now null,
* something bad happened, so don't bother trying to 'get' it
*/
if ((cp->c_backvp == NULL) ||
(fscp->fs_cdconnected != CFS_CD_CONNECTED) ||
(fscp->fs_backvfsp == NULL)) {
if (cp->c_flags | CN_STALE) {
cp->c_flags |= CN_NOCACHE;
error = ESTALE;
}
goto out;
}
}
/* get the file attributes from the back fs */
attrs.va_mask = AT_ALL;
error = VOP_GETATTR(cp->c_backvp, &attrs, 0, cr, NULL);
backhit = 1;
if (error)
goto out;
/* if the mtime or size of the file has changed */
if ((!C_CACHE_VALID(mdp->md_vattr.va_mtime, attrs.va_mtime) ||
(cp->c_size != attrs.va_size)) &&
((mdp->md_flags & MD_NEEDATTRS) == 0)) {
fail = 1;
if (vn_has_cached_data(CTOV(cp))) {
mutex_exit(&cp->c_statelock);
error = cachefs_putpage_common(CTOV(cp),
(offset_t)0, 0, B_INVAL, cr);
mutex_enter(&cp->c_statelock);
if (CFS_TIMEOUT(fscp, error))
goto out;
error = 0;
/*
* if an async pop started while the lock was
* dropped, go back and try again
*/
if ((cp->c_flags & CN_ASYNC_POP_WORKING) &&
(cp->c_popthrp != curthread))
goto again;
}
/*
* We should properly handle the CN_NOCACHE flag here.
* In fact, we should remember that cachefs_inval_object()
* forcibly sets/unsets the flag, so we should keep a
* state of the flag over the call.
*/
if ((cp->c_flags & CN_NOCACHE) == 0)
cachefs_inval_object(cp);
else {
cachefs_inval_object(cp);
cp->c_flags |= CN_NOCACHE;
}
if ((CTOV(cp))->v_type == VREG) {
attrs.va_mask = AT_ALL;
error = VOP_GETATTR(cp->c_backvp, &attrs, 0, cr, NULL);
if (error)
goto out;
}
if (!vn_has_cached_data(CTOV(cp))) {
cp->c_size = attrs.va_size;
#ifdef CFSDEBUG
} else {
CFS_DEBUG(CFSDEBUG_VOPS)
printf("c_cod_check: v_pages not null\n");
#endif
}
}
/* toss cached acl info if ctime changed */
if (!C_CACHE_VALID(mdp->md_vattr.va_ctime, attrs.va_ctime)) {
cachefs_purgeacl(cp);
}
cp->c_attr = attrs;
if (attrs.va_size > cp->c_size)
cp->c_size = attrs.va_size;
mdp->md_x_time = fscp->fs_cod_time;
mdp->md_flags &= ~MD_NEEDATTRS;
cachefs_cnode_setlocalstats(cp);
cp->c_flags |= CN_UPDATED;
out:
if (backhit != 0) {
if (fail != 0)
fscp->fs_stats.st_fails++;
else
fscp->fs_stats.st_passes++;
}
#ifdef CFSDEBUG
CFS_DEBUG(CFSDEBUG_VOPS)
printf("c_cod_check_cached_object: EXIT\n");
#endif
return (error);
}
/*ARGSUSED*/
static void
c_cod_modify_cached_object(struct fscache *fscp, struct cnode *cp, cred_t *cr)
{
struct vattr attrs;
int error = 0;
nlink_t nlink;
cachefs_metadata_t *mdp = &cp->c_metadata;
ASSERT(MUTEX_HELD(&cp->c_statelock));
ASSERT(fscp->fs_cdconnected == CFS_CD_CONNECTED);
ASSERT(fscp->fs_backvfsp);
fscp->fs_stats.st_modifies++;
/* from now on, make sure we're using the server's idea of time */
mdp->md_flags &= ~(MD_LOCALCTIME | MD_LOCALMTIME);
mdp->md_flags |= MD_NEEDATTRS;
/* if in write-around mode, make sure file is nocached */
if (CFS_ISFS_WRITE_AROUND(fscp)) {
if ((cp->c_flags & CN_NOCACHE) == 0)
cachefs_nocache(cp);
/*
* If a directory, then defer getting the new attributes
* until requested. Might be a little bit faster this way.
*/
if (CTOV(cp)->v_type == VDIR)
goto out;
}
/* get the new mtime so the next call to check_cobject does not fail */
if (cp->c_backvp == NULL) {
error = cachefs_getbackvp(fscp, cp);
if (error) {
mdp->md_vattr.va_mtime.tv_sec = 0;
goto out;
}
}
attrs.va_mask = AT_ALL;
ASSERT(cp->c_backvp != NULL);
error = VOP_GETATTR(cp->c_backvp, &attrs, 0, cr, NULL);
if (error) {
mdp->md_vattr.va_mtime.tv_sec = 0;
goto out;
}
nlink = cp->c_attr.va_nlink;
cp->c_attr = attrs;
cp->c_attr.va_nlink = nlink;
if ((attrs.va_size > cp->c_size) || !vn_has_cached_data(CTOV(cp)))
cp->c_size = attrs.va_size;
mdp->md_flags &= ~MD_NEEDATTRS;
cachefs_cnode_setlocalstats(cp);
out:
cp->c_flags |= CN_UPDATED;
}
/*ARGSUSED*/
static void
c_cod_invalidate_cached_object(struct fscache *fscp, struct cnode *cp,
cred_t *cr)
{
cachefs_metadata_t *mdp = &cp->c_metadata;
ASSERT(MUTEX_HELD(&cp->c_statelock));
mdp->md_vattr.va_mtime.tv_sec = 0;
mdp->md_flags |= MD_NEEDATTRS;
cp->c_flags |= CN_UPDATED;
}
/*ARGSUSED*/
static void
c_cod_convert_cached_object(struct fscache *fscp, struct cnode *cp,
cred_t *cr)
{
cachefs_metadata_t *mdp = &cp->c_metadata;
ASSERT(MUTEX_HELD(&cp->c_statelock));
mdp->md_flags |= MD_NEEDATTRS;
mdp->md_consttype = CFS_FS_CONST_CODCONST;
cp->c_flags |= CN_UPDATED;
}
struct cachefsops codcfsops = {
c_cod_init_cached_object,
c_cod_check_cached_object,
c_cod_modify_cached_object,
c_cod_invalidate_cached_object,
c_cod_convert_cached_object
};
|