d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cache: assorted comment fixups

Browse Source
This commit is contained in:
Mateusz Guzik 2021-02-09 17:06:27 +01:00
parent b49a0db662
commit 39e0c3f686
1 changed files with 12 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
sys/kern/vfs_cache.c
View File

@ -5268,6 +5268,10 @@ cache_fplookup_parse(struct cache_fpl *fpl)
cache_fpl_pathlen_sub(fpl, cnp->cn_namelen);
#ifdef INVARIANTS
/*
* cache_get_hash only accepts lengths up to NAME_MAX. This is fine since
* we are going to fail this lookup with ENAMETOOLONG (see below).
*/
if (cnp->cn_namelen <= NAME_MAX) {
if (fpl->hash != cache_get_hash(cnp->cn_nameptr, cnp->cn_namelen, dvp)) {
panic("%s: mismatched hash for [%s] len %ld", __func__,
@ -5359,7 +5363,7 @@ cache_fplookup_skip_slashes(struct cache_fpl *fpl)
* manner relying on an invariant that a non-directory vnode will get a miss.
* In this case cn_nameptr[0] == '\0' and cn_namelen == 0.
*
* Thus for a path like "foo/bar/" the code unwinds the state back to 'bar/'
* Thus for a path like "foo/bar/" the code unwinds the state back to "bar/"
* and denotes this is the last path component, which avoids looping back.
*
* Only plain lookups are supported for now to restrict corner cases to handle.
@ -5454,14 +5458,14 @@ cache_fplookup_trailingslash(struct cache_fpl *fpl)
#endif
/*
* The previous directory is this one.
* If this was a "./" lookup the parent directory is already correct.
*/
if (cnp->cn_nameptr[0] == '.' && cnp->cn_namelen == 1) {
return (0);
}
/*
* The previous directory is something else.
* Otherwise we need to look it up.
*/
tvp = fpl->tvp;
ncp = atomic_load_consume_ptr(&tvp->v_cache_dd);
@ -5495,10 +5499,11 @@ cache_fplookup_failed_vexec(struct cache_fpl *fpl, int error)
dvp_seqc = fpl->dvp_seqc;
/*
* TODO: Due to ignoring slashes lookup will perform a permission check
* on the last dir when it should not have. If it fails, we get here.
* It is possible possible to fix it up fully without resorting to
* regular lookup, but for now just abort.
* TODO: Due to ignoring trailing slashes lookup will perform a
* permission check on the last dir when it should not be doing it. It
* may fail, but said failure should be ignored. It is possible to fix
* it up fully without resorting to regular lookup, but for now just
* abort.
*/
if (cache_fpl_istrailingslash(fpl)) {
return (cache_fpl_aborted(fpl));