On Tue, 2009-01-20 at 12:31 +1100, Paul Wankadia wrote:
> On Mon, Jan 19, 2009 at 11:24 PM, Ian Kent <[email protected]> wrote:
snip ...
> @@ -391,7 +380,6 @@ int lookup_read_master(struct master
> *master, time_t age, void *context)
> int blen;
> char *path;
> char *ent;
> - struct stat st;
> FILE *f;
> int fd;
>
> You should be able to get rid of `fd' and the fileno(3) call now.
>
>
> unsigned int path_len, ent_len;
> @@ -504,13 +492,6 @@ int lookup_read_master(struct master
> *master, time_t age, void *context)
> break;
> }
>
> - if (fstat(fd, &st)) {
> - crit(logopt, MODPREFIX "file map %s, could not
> stat",
> - ctxt->mapname);
> - return NSS_STATUS_UNAVAIL;
> - }
> - ctxt->mtime = st.st_mtime;
> -
> fclose(f);
>
> return NSS_STATUS_SUCCESS;
> @@ -642,7 +623,6 @@ int lookup_read_map(struct autofs_point
> *ap, time_t age, void *context)
> struct mapent_cache *mc;
> char *key;
> char *mapent;
> - struct stat st;
> FILE *f;
> int fd;
>
> You should be able to get rid of `fd' and the fileno(3) call now.
Yep, quite right.
>
>
> unsigned int k_len, m_len;
> @@ -748,13 +728,6 @@ int lookup_read_map(struct autofs_point
> *ap, time_t age, void *context)
> break;
> }
>
> - if (fstat(fd, &st)) {
> - crit(ap->logopt,
> - MODPREFIX "file map %s, could not stat",
> - ctxt->mapname);
> - return NSS_STATUS_UNAVAIL;
> - }
> - ctxt->mtime = st.st_mtime;
> source->age = age;
>
> fclose(f);
> @@ -951,9 +924,6 @@ static int check_map_indirect(struct
> autofs_point *ap,
> if (ret == CHE_FAIL)
> return NSS_STATUS_NOTFOUND;
>
> - if (ret & CHE_UPDATED)
> - source->stale = 1;
> -
> pthread_cleanup_push(cache_lock_cleanup, mc);
> cache_writelock(mc);
> exists = cache_lookup_distinct(mc, key);
> @@ -963,7 +933,6 @@ static int check_map_indirect(struct
> autofs_point *ap,
> free(exists->mapent);
> exists->mapent = NULL;
> exists->status = 0;
> - source->stale = 1;
> }
> }
> pthread_cleanup_pop(1);
> @@ -985,14 +954,8 @@ static int check_map_indirect(struct
> autofs_point *ap,
> we = cache_lookup_distinct(mc, "*");
> if (we) {
> /* Wildcard entry existed and is now
> gone */
> - if (we->source == source && (wild &
> CHE_MISSING)) {
> + if (we->source == source && (wild &
> CHE_MISSING))
> cache_delete(mc, "*");
> - source->stale = 1;
> - }
> - } else {
> - /* Wildcard not in map but now is */
> - if (wild & (CHE_OK | CHE_UPDATED))
> - source->stale = 1;
> }
> pthread_cleanup_pop(1);
>
> @@ -1062,9 +1025,28 @@ int lookup_mount(struct autofs_point
> *ap, const char *name, int name_len, void *
> * we never know about it.
> */
> if (ap->type == LKP_INDIRECT && *key != '/') {
> + struct stat st;
> char *lkp_key;
>
> + /*
> + * We can skip the map lookup and cache update
> altogether
> + * if we know the map hasn't been modified
> since it was
> + * last read. If it has then we can mark the
> map stale
> + * so a re-read is triggered following the
> lookup.
> + */
> + if (stat(ctxt->mapname, &st)) {
> + error(ap->logopt, MODPREFIX
> + "file map %s, could not stat",
> ctxt->mapname);
> + return NSS_STATUS_UNAVAIL;
> + }
> +
> cache_readlock(mc);
> + me = cache_lookup_first(mc);
> + if (me && st.st_mtime <= me->age)
> + goto do_cache_lookup;
> + else
> + source->stale = 1;
>
> Perhaps some output for debugging purposes wouldn't go astray?
Mmm .. I'll see what I can do.
>
>
> +
> me = cache_lookup_distinct(mc, key);
> if (me && me->multi)
> lkp_key = strdup(me->multi->key);
> @@ -1088,6 +1070,7 @@ int lookup_mount(struct autofs_point
> *ap, const char *name, int name_len, void *
> }
>
> cache_readlock(mc);
> +do_cache_lookup:
> me = cache_lookup(mc, key);
> /* Stale mapent => check for entry in alternate source
> or wildcard */
> if (me && !me->mapent) {
>
>
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