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| author | Mateusz Guzik <mjg@FreeBSD.org> | 2021-01-01 02:25:19 +0000 |
|---|---|---|
| committer | Mateusz Guzik <mjg@FreeBSD.org> | 2021-01-03 06:50:06 +0000 |
| commit | 7220a10b5b343f0528612c62072f80458076a061 (patch) | |
| tree | 1dc04a36aaea809b0461ee7e565f5e9b269c1eba | |
| parent | 30a2fc91fa5a0fa8717da788cc18073cca786c05 (diff) | |
| download | src-7220a10b5b343f0528612c62072f80458076a061.tar.gz src-7220a10b5b343f0528612c62072f80458076a061.zip | |
cache: predict on no spurious slashes in cache_fpl_handle_root
This is a step towards speculatively not handling them.
| -rw-r--r-- | sys/kern/vfs_cache.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index b4882079790d..396969bb10ec 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -3623,9 +3623,15 @@ cache_fpl_handle_root(struct cache_fpl *fpl) ndp = fpl->ndp; cnp = fpl->cnp; - while (*(cnp->cn_nameptr) == '/') { - cnp->cn_nameptr++; - ndp->ni_pathlen--; + MPASS(*(cnp->cn_nameptr) == '/'); + cnp->cn_nameptr++; + ndp->ni_pathlen--; + + if (__predict_false(*(cnp->cn_nameptr) == '/')) { + do { + cnp->cn_nameptr++; + ndp->ni_pathlen--; + } while (*(cnp->cn_nameptr) == '/'); } return (ndp->ni_rootdir); |