fs/msdosfs/msdosfs_fat.c

76 static void	fc_lookup(struct denode *dep, u_long findcn, u_long *frcnp,
116  * dep	  - address of denode representing the file of interest
132 pcbmap(struct denode *dep, u_long findcn, daddr_t *bnp, u_long *cnp, int *sp)
143 	struct msdosfsmount *pmp = dep->de_pmp;
148 	ASSERT_VOP_ELOCKED(DETOV(dep), "pcbmap");
150 	cn = dep->de_StartCluster;
158 		if (dep->de_Attributes & ATTR_DIRECTORY) {
159 			if (de_cn2off(pmp, findcn) >= dep->de_FileSize) {
170 				    dep->de_FileSize - de_cn2off(pmp, findcn));
191 	fc_lookup(dep, findcn, &i, &cn);
244 		fc_setcache(dep, FC_LASTMAP, i, cn);
254 	fc_setcache(dep, FC_LASTFC, i - 1, prevcn);
263 fc_lookup(struct denode *dep, u_long findcn, u_long *frcnp, u_long *fsrcnp)
269 	ASSERT_VOP_LOCKED(DETOV(dep), "fc_lookup");
272 		cn = dep->de_fc[i].fc_frcn;
275 				closest = &dep->de_fc[i];
285  * Purge the FAT cache in denode dep of all entries relating to file
289 fc_purge(struct denode *dep, u_int frcn)
294 	ASSERT_VOP_ELOCKED(DETOV(dep), "fc_purge");
296 	fcp = dep->de_fc;
975  * dep	 - the file to extend
988 extendfile(struct denode *dep, u_long count, struct buf **bpp, u_long *ncp,
994 	struct msdosfsmount *pmp = dep->de_pmp;
1001 	if (dep->de_StartCluster == MSDOSFSROOT
1002 	    && (dep->de_Attributes & ATTR_DIRECTORY)) {
1013 	if (dep->de_fc[FC_LASTFC].fc_frcn == FCE_EMPTY &&
1014 	    dep->de_StartCluster != 0) {
1015 		error = pcbmap(dep, 0xffff, 0, &cn, 0);
1021 	dep->de_fc[FC_NEXTTOLASTFC].fc_frcn =
1022 	    dep->de_fc[FC_LASTFC].fc_frcn;
1023 	dep->de_fc[FC_NEXTTOLASTFC].fc_fsrcn =
1024 	    dep->de_fc[FC_LASTFC].fc_fsrcn;
1035 		if (dep->de_StartCluster == 0)
1038 			cn = dep->de_fc[FC_LASTFC].fc_fsrcn + 1;
1054 		if (dep->de_StartCluster == 0) {
1055 			dep->de_StartCluster = cn;
1059 					 dep->de_fc[FC_LASTFC].fc_fsrcn,
1065 			frcn = dep->de_fc[FC_LASTFC].fc_frcn + 1;
1072 		fc_setcache(dep, FC_LASTFC, frcn + got - 1, cn + got - 1);
1079 				if (dep->de_Attributes & ATTR_DIRECTORY)
1084 					bp = getblk(DETOV(dep),
1090 					if (pcbmap(dep,
1108 					vn_fsync_buf(DETOV(dep), MNT_WAIT);