sys/kern/vfs_cache.c

65 SDT_PROBE_DEFINE3(vfs, namecache, enter, done, done, "struct vnode *", "char *",
67 SDT_PROBE_DEFINE2(vfs, namecache, enter_negative, done, done, "struct vnode *",
69 SDT_PROBE_DEFINE1(vfs, namecache, fullpath, entry, entry, "struct vnode *");
70 SDT_PROBE_DEFINE3(vfs, namecache, fullpath, hit, hit, "struct vnode *",
72 SDT_PROBE_DEFINE1(vfs, namecache, fullpath, miss, miss, "struct vnode *");
73 SDT_PROBE_DEFINE3(vfs, namecache, fullpath, return, return, "int",
75 SDT_PROBE_DEFINE3(vfs, namecache, lookup, hit, hit, "struct vnode *", "char *",
77 SDT_PROBE_DEFINE2(vfs, namecache, lookup, hit_negative, hit-negative,
79 SDT_PROBE_DEFINE2(vfs, namecache, lookup, miss, miss, "struct vnode *",
81 SDT_PROBE_DEFINE1(vfs, namecache, purge, done, done, "struct vnode *");
82 SDT_PROBE_DEFINE1(vfs, namecache, purge_negative, done, done, "struct vnode *");
83 SDT_PROBE_DEFINE1(vfs, namecache, purgevfs, done, done, "struct mount *");
84 SDT_PROBE_DEFINE3(vfs, namecache, zap, done, done, "struct vnode *", "char *",
86 SDT_PROBE_DEFINE2(vfs, namecache, zap_negative, done, done, "struct vnode *",
94 struct	namecache {
95 	LIST_ENTRY(namecache) nc_hash;	/* hash chain */
96 	LIST_ENTRY(namecache) nc_src;	/* source vnode list */
97 	TAILQ_ENTRY(namecache) nc_dst;	/* destination vnode list */
106  * struct namecache_ts repeats struct namecache layout up to the
108  * struct namecache_ts is used in place of struct namecache when time(s) need
114 	LIST_ENTRY(namecache) nc_hash;	/* hash chain */
115 	LIST_ENTRY(namecache) nc_src;	/* source vnode list */
116 	TAILQ_ENTRY(namecache) nc_dst;	/* destination vnode list */
128  * Flags in namecache.nc_flag
157 static LIST_HEAD(nchashhead, namecache) *nchashtbl;	/* Hash Table */
158 static TAILQ_HEAD(, namecache) ncneg;	/* Hash Table */
161     "Size of namecache hash table");
164     "Ratio of negative namecache entries");
167     "Number of negative entries in namecache");
170     "Number of namecache entries");
173     "Number of namecache entries with vnodes held");
176     "Size factor for namecache");
203 static struct namecache *
220 cache_free(struct namecache *ncp)
239 nc_get_name(struct namecache *ncp)
250 cache_out_ts(struct namecache *ncp, struct timespec *tsp, int *ticksp)
265     "VFS namecache enabled");
268 SYSCTL_INT(_debug_sizeof, OID_AUTO, namecache, CTLFLAG_RD, 0,
269     sizeof(struct namecache), "sizeof(struct namecache)");
309 static void cache_zap(struct namecache *ncp);
329 	struct namecache *ncp;
360 	struct namecache *ncp;
408  *   Removes a namecache entry from cache, whether it contains an actual
413 	struct namecache *ncp;
421 		SDT_PROBE(vfs, namecache, zap, done, ncp->nc_dvp,
424 		SDT_PROBE(vfs, namecache, zap_negative, done, ncp->nc_dvp,
479 	struct namecache *ncp;
500 			SDT_PROBE(vfs, namecache, lookup, hit, dvp, ".",
511 				SDT_PROBE(vfs, namecache, lookup, miss, dvp,
534 			SDT_PROBE(vfs, namecache, lookup, hit, dvp, "..",
556 		SDT_PROBE(vfs, namecache, lookup, miss, dvp, cnp->cn_nameptr,
585 		SDT_PROBE(vfs, namecache, lookup, hit, dvp, nc_get_name(ncp),
617 	SDT_PROBE(vfs, namecache, lookup, hit_negative, dvp, nc_get_name(ncp),
713 	struct namecache *ncp, *n2;
732 	 * Avoid blowout in namecache entries.
746 			 * namecache entry allocation.
767 			SDT_PROBE(vfs, namecache, enter, done, dvp, "..", vp,
779 	 * namecache entry as possible before acquiring the lock.
869 	 * Insert the new namecache entry into the appropriate chain
888 		SDT_PROBE(vfs, namecache, enter, done, dvp, nc_get_name(ncp),
892 		SDT_PROBE(vfs, namecache, enter_negative, done, dvp,
916 	    sizeof(struct namecache) + CACHE_PATH_CUTOFF + 1,
922 	    sizeof(struct namecache) + NAME_MAX + 1,
942 	SDT_PROBE(vfs, namecache, purge, done, vp, 0, 0, 0, 0);
964 	struct namecache *cp, *ncp;
967 	SDT_PROBE(vfs, namecache, purge_negative, done, vp, 0, 0, 0, 0);
984 	struct namecache *ncp, *nnp;
987 	SDT_PROBE(vfs, namecache, purgevfs, done, mp, 0, 0, 0, 0);
1204 	struct namecache *ncp;
1217 			SDT_PROBE(vfs, namecache, fullpath, return, error,
1223 		SDT_PROBE(vfs, namecache, fullpath, hit, ncp->nc_dvp,
1233 	SDT_PROBE(vfs, namecache, fullpath, miss, vp, 0, 0, 0, 0);
1241 		SDT_PROBE(vfs, namecache, fullpath, return,  error, vp,
1253 		SDT_PROBE(vfs, namecache, fullpath, return, error, vp,
1282 	SDT_PROBE(vfs, namecache, fullpath, entry, vp, 0, 0, 0, 0);
1304 				SDT_PROBE(vfs, namecache, fullpath, return,
1321 			SDT_PROBE(vfs, namecache, fullpath, return,
1332 			SDT_PROBE(vfs, namecache, fullpath, return, error,
1346 			SDT_PROBE(vfs, namecache, fullpath, return, ENOMEM,
1356 	SDT_PROBE(vfs, namecache, fullpath, return, 0, startvp, buf + buflen,
1365 	struct namecache *ncp;
1387 	struct namecache *ncp;
1429  * because it falls back to the ".." lookup if the namecache lookup fails.