2 * $Id: ofork.c,v 1.7 2001-12-03 05:03:38 jmarcus Exp $
4 * Copyright (c) 1996 Regents of The University of Michigan.
5 * All Rights Reserved. See COPYRIGHT.
10 #endif /* HAVE_CONFIG_H */
15 #include <sys/stat.h> /* works around a bug */
16 #include <sys/param.h>
20 #include <atalk/adouble.h>
24 #include "directory.h"
27 /* we need to have a hashed list of oforks (by name). just hash
29 #define OFORK_HASHSIZE 64
30 static struct ofork *ofork_table[OFORK_HASHSIZE];
32 static struct ofork **oforks = NULL;
33 static int nforks = 0;
34 static u_short lastrefnum = 0;
37 /* OR some of each character for the hash*/
38 static __inline__ unsigned long hashfn(const char *name)
43 i = ((i << 4) | (8*sizeof(i) - 4)) ^ *name++;
45 return i & (OFORK_HASHSIZE - 1);
48 static __inline__ void of_hash(struct ofork *of)
52 table = &ofork_table[hashfn(of->of_name)];
53 if ((of->next = *table) != NULL)
54 (*table)->prevp = &of->next;
59 static __inline__ void of_unhash(struct ofork *of)
63 of->next->prevp = of->prevp;
64 *(of->prevp) = of->next;
68 void of_pforkdesc( f )
76 for ( ofrefnum = 0; ofrefnum < nforks; ofrefnum++ ) {
77 if ( oforks[ ofrefnum ] != NULL ) {
78 fprintf( f, "%hu <%s>\n", ofrefnum, oforks[ ofrefnum ]->of_name);
83 int of_flush(const struct vol *vol)
90 for ( refnum = 0; refnum < nforks; refnum++ ) {
91 if (oforks[ refnum ] != NULL && (oforks[refnum]->of_vol == vol) &&
92 flushfork( oforks[ refnum ] ) < 0 ) {
93 syslog( LOG_ERR, "of_flush: %s", strerror(errno) );
100 int of_rename(vol, olddir, oldpath, newdir, newpath)
101 const struct vol *vol;
102 struct dir *olddir, *newdir;
103 const char *oldpath, *newpath;
105 struct ofork *of, *next, *d_ofork;
107 next = ofork_table[hashfn(oldpath)];
108 while ((of = next)) {
109 next = next->next; /* so we can unhash and still be all right. */
111 if ((vol == of->of_vol) && (olddir == of->of_dir) &&
112 (strcmp(of->of_name, oldpath) == 0)) {
114 strncpy( of->of_name, newpath, of->of_namelen);
115 of->of_d_prev->of_d_next = of->of_d_prev;
116 of->of_d_next->of_d_prev = of->of_d_next;
118 if (!(d_ofork = newdir->d_ofork)) {
119 newdir->d_ofork = of;
120 of->of_d_next = of->of_d_prev = of;
122 of->of_d_next = d_ofork;
123 of->of_d_prev = d_ofork->of_d_prev;
124 of->of_d_prev->of_d_next = of;
125 d_ofork->of_d_prev = of;
135 of_alloc(vol, dir, path, ofrefnum, eid, ad)
143 struct ofork *of, *d_ofork;
144 u_int16_t refnum, of_refnum;
149 nforks = (getdtablesize() - 10) / 2;
150 oforks = (struct ofork **) calloc(nforks, sizeof(struct ofork *));
155 for ( refnum = lastrefnum++, i = 0; i < nforks; i++, refnum++ ) {
156 if ( oforks[ refnum % nforks ] == NULL ) {
161 syslog(LOG_ERR, "of_alloc: maximum number of forks exceeded.");
165 of_refnum = refnum % nforks;
166 if (( oforks[ of_refnum ] =
167 (struct ofork *)malloc( sizeof( struct ofork ))) == NULL ) {
168 syslog( LOG_ERR, "of_alloc: malloc: %s", strerror(errno) );
171 of = oforks[of_refnum];
173 /* see if we need to allocate space for the adouble struct */
175 ad = malloc( sizeof( struct adouble ) );
177 syslog( LOG_ERR, "of_alloc: malloc: %s", strerror(errno) );
181 /* initialize to zero. This is important to ensure that
182 ad_open really does reinitialize the structure. */
183 memset( ad, 0, sizeof( struct adouble ) );
185 /* Increase the refcount on this struct adouble. This is
186 decremented again in oforc_dealloc. */
195 if (!(d_ofork = dir->d_ofork)) {
197 of->of_d_next = of->of_d_prev = of;
199 of->of_d_next = d_ofork;
200 of->of_d_prev = d_ofork->of_d_prev;
201 d_ofork->of_d_prev->of_d_next = of;
202 d_ofork->of_d_prev = of;
205 /* here's the deal: we allocate enough for the standard mac file length.
206 * in the future, we'll reallocate in fairly large jumps in case
207 * of long unicode names */
208 if (( of->of_name =(char *)malloc(MACFILELEN + 1)) ==
210 syslog( LOG_ERR, "of_alloc: malloc: %s", strerror(errno) );
214 oforks[ of_refnum ] = NULL;
217 strncpy( of->of_name, path, of->of_namelen = MACFILELEN + 1);
219 of->of_refnum = of_refnum;
222 if (eid == ADEID_DFORK)
223 of->of_flags = AFPFORK_DATA;
225 of->of_flags = AFPFORK_RSRC;
230 struct ofork *of_find(const u_int16_t ofrefnum )
232 if (!oforks || !nforks)
235 return( oforks[ ofrefnum % nforks ] );
239 of_findname(const struct vol *vol, const struct dir *dir, const char *name)
243 for (of = ofork_table[hashfn(name)]; of; of = of->next) {
244 if ((vol == of->of_vol) && (dir == of->of_dir) &&
245 (strcmp(of->of_name, name) == 0))
253 void of_dealloc( of )
262 of->of_d_prev->of_d_next = of->of_d_next;
263 of->of_d_next->of_d_prev = of->of_d_prev;
264 if (of->of_dir->d_ofork == of) {
265 of->of_dir->d_ofork = (of == of->of_d_next) ? NULL : of->of_d_next;
268 oforks[ of->of_refnum ] = NULL;
271 /* decrease refcount */
272 of->of_ad->ad_refcount--;
274 if ( of->of_ad->ad_refcount <= 0) {
276 } else {/* someone's still using it. just free this user's locks */
277 ad_unlock(of->of_ad, of->of_refnum);