diff options
Diffstat (limited to 'libdiskfs/lookup.c')
| -rw-r--r-- | libdiskfs/lookup.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/libdiskfs/lookup.c b/libdiskfs/lookup.c index 40ce8937..282d829f 100644 --- a/libdiskfs/lookup.c +++ b/libdiskfs/lookup.c @@ -20,6 +20,17 @@ #include "priv.h" +static struct +{ + int present; + int absent; + int errors; + int dot; + int dotdot; +} cache_misses; +static spin_lock_t cm_lock = SPIN_LOCK_INITIALIZER; + + /* Lookup in directory DP (which is locked) the name NAME. TYPE will either be LOOKUP, CREATE, RENAME, or REMOVE. CRED identifies the user making the call. @@ -71,7 +82,7 @@ diskfs_lookup (struct node *dp, char *name, enum lookup_type type, struct protid *cred) { error_t err; - + if (type == REMOVE || type == RENAME) assert (np); @@ -119,6 +130,26 @@ diskfs_lookup (struct node *dp, char *name, enum lookup_type type, } err = diskfs_lookup_hard (dp, name, type, np, ds, cred); + + spin_lock (&cm_lock); + if (type == LOOKUP) + { + if (err == ENOENT) + cache_misses.absent++; + else if (err) + cache_misses.errors++; + else + cache_misses.present++; + if (name[0] == '.') + { + if (name[1] == '\0') + cache_misses.dot++; + else if (name[1] == '.' && name[2] == '\0') + cache_misses.dotdot++; + } + } + spin_unlock (&cm_lock); + if (err && err != ENOENT) return err; @@ -137,6 +168,8 @@ diskfs_lookup (struct node *dp, char *name, enum lookup_type type, if ((type == LOOKUP || type == CREATE) && !err && np) diskfs_enter_lookup_cache (dp, *np, name); + else if (type == LOOKUP && err == ENOENT) + diskfs_enter_lookup_cache (dp, 0, name); return err; } |