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cache: combine fast path enabled status into one flag

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Tested by:	pho
This commit is contained in:
Mateusz Guzik 2021-01-01 08:06:12 +01:00
parent dbbbc07cc3
commit 33f3e81df5
3 changed files with 43 additions and 12 deletions
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51
sys/kern/vfs_cache.c
View File

@ -3571,12 +3571,45 @@ DB_SHOW_COMMAND(vpath, db_show_vpath)
#endif
static bool __read_frequently cache_fast_lookup = true;
SYSCTL_BOOL(_vfs, OID_AUTO, cache_fast_lookup, CTLFLAG_RW,
&cache_fast_lookup, 0, "");
static int cache_fast_lookup = 1;
static char __read_frequently cache_fast_lookup_enabled = true;
#define CACHE_FPL_FAILED -2020
void
cache_fast_lookup_enabled_recalc(void)
{
int lookup_flag;
int mac_on;
#ifdef MAC
mac_on = mac_vnode_check_lookup_enabled();
#else
mac_on = 0;
#endif
lookup_flag = atomic_load_int(&cache_fast_lookup);
if (lookup_flag && !mac_on) {
atomic_store_char(&cache_fast_lookup_enabled, true);
} else {
atomic_store_char(&cache_fast_lookup_enabled, false);
}
}
static int
syscal_vfs_cache_fast_lookup(SYSCTL_HANDLER_ARGS)
{
int error, old;
old = atomic_load_int(&cache_fast_lookup);
error = sysctl_handle_int(oidp, arg1, arg2, req);
if (error == 0 && req->newptr && old != atomic_load_int(&cache_fast_lookup))
cache_fast_lookup_enabled_recalc();
return (error);
}
SYSCTL_PROC(_vfs, OID_AUTO, cache_fast_lookup, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_MPSAFE,
&cache_fast_lookup, 0, syscal_vfs_cache_fast_lookup, "IU", "");
/*
* Components of nameidata (or objects it can point to) which may
* need restoring in case fast path lookup fails.
@ -3854,16 +3887,10 @@ cache_can_fplookup(struct cache_fpl *fpl)
cnp = fpl->cnp;
td = cnp->cn_thread;
if (!cache_fast_lookup) {
if (!atomic_load_char(&cache_fast_lookup_enabled)) {
cache_fpl_aborted_early(fpl);
return (false);
}
#ifdef MAC
if (mac_vnode_check_lookup_enabled()) {
cache_fpl_aborted_early(fpl);
return (false);
}
#endif
if ((cnp->cn_flags & ~CACHE_FPL_SUPPORTED_CN_FLAGS) != 0) {
cache_fpl_aborted_early(fpl);
return (false);
@ -5205,9 +5232,9 @@ cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
}
MPASS(cnp->cn_nameptr == cnp->cn_pnbuf);
if (!cache_can_fplookup(&fpl)) {
SDT_PROBE3(vfs, fplookup, lookup, done, ndp, fpl.line, fpl.status);
if (__predict_false(!cache_can_fplookup(&fpl))) {
*status = fpl.status;
SDT_PROBE3(vfs, fplookup, lookup, done, ndp, fpl.line, fpl.status);
return (EOPNOTSUPP);
}

3
sys/security/mac/mac_framework.c
View File

@ -82,6 +82,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sdt.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
@ -399,6 +400,8 @@ mac_policy_update(void)
mac_labeled |= mac_policy_getlabeled(mpc);
mac_policy_count++;
}
cache_fast_lookup_enabled_recalc();
}
/*

1
sys/sys/vnode.h
View File

@ -657,6 +657,7 @@ cache_validate(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
}
#endif
void cache_fast_lookup_enabled_recalc(void);
int change_dir(struct vnode *vp, struct thread *td);
void cvtstat(struct stat *st, struct ostat *ost);
void freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb);