3 /*-
4  * SPDX-License-Identifier: BSD-4-Clause
36 /*-
73  * pmp	     - address of msdosfsmount structure of the filesystem containing
76  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
79  * diroffset - offset past begin of cluster of denode we want
80  * depp	     - returns the address of the gotten denode.
100 		dirclust = pmp->pm_rootdirblk;  in deget()
102 	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;  in deget()
105 	ldep->de_vnode = NULL;  in deget()
106 	ldep->de_flag = 0;  in deget()
107 	ldep->de_dirclust = dirclust;  in deget()
108 	ldep->de_diroffset = diroffset;  in deget()
109 	ldep->de_inode = inode;  in deget()
110 	ldep->de_pmp = pmp;  in deget()
111 	ldep->de_refcnt = 1;  in deget()
117 	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))  in deget()
121 		 * so we manufacture one. We should probably rummage  in deget()
123 		 * exists), and then use the time and date from that entry  in deget()
124 		 * as the time and date for the root denode.  in deget()
126 		ldep->de_vnode = (struct vnode *)-1;  in deget()
128 		ldep->de_Attributes = ATTR_DIRECTORY;  in deget()
129 		ldep->de_LowerCase = 0;  in deget()
131 			ldep->de_StartCluster = pmp->pm_rootdirblk;  in deget()
134 			ldep->de_StartCluster = MSDOSFSROOT;  in deget()
135 			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;  in deget()
138 		 * fill in time and date so that dos2unixtime() doesn't  in deget()
142 		ldep->de_CHun = 0;  in deget()
143 		ldep->de_CTime = 0x0000;	/* 00:00:00	 */  in deget()
144 		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)  in deget()
147 		ldep->de_ADate = ldep->de_CDate;  in deget()
148 		ldep->de_MTime = ldep->de_CTime;  in deget()
149 		ldep->de_MDate = ldep->de_CDate;  in deget()
154 			ldep->de_Name[0] = SLOT_DELETED;  in deget()
167 	if (ldep->de_Attributes & ATTR_DIRECTORY) {  in deget()
181 		if (diroffset == 0 && ldep->de_StartCluster != dirclust) {  in deget()
183 			    dirclust, ldep->de_StartCluster));  in deget()
185 			ldep->de_StartCluster = dirclust;  in deget()
188 		if (ldep->de_StartCluster != MSDOSFSROOT) {  in deget()
191 				ldep->de_FileSize = de_cn2off(pmp, size);  in deget()
214 	int isadir = dep->de_Attributes & ATTR_DIRECTORY;  in detrunc()
216 	struct msdosfsmount *pmp = dep->de_pmp;  in detrunc()
219 	    dep->de_Name, length, flags));  in detrunc()
229 	if (dep->de_vnode != NULL && !FAT32(pmp)) {  in detrunc()
232 		    dep->de_dirclust, dep->de_diroffset));  in detrunc()
237 	if (dep->de_FileSize < length)  in detrunc()
250 		chaintofree = dep->de_StartCluster;  in detrunc()
251 		dep->de_StartCluster = 0;  in detrunc()
254 		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,  in detrunc()
270 	if ((boff = length & pmp->pm_crbomask) != 0) {  in detrunc()
273 			error = bread((void *)pmp->pm_devvp, bn,  in detrunc()
274 			    pmp->pm_bpcluster, 0, &bp);  in detrunc()
282 			memset(bp->b_data + boff, 0, pmp->pm_bpcluster - boff);  in detrunc()
291 	dep->de_FileSize = length;  in detrunc()
293 		dep->de_flag |= DE_UPDATE|DE_MODIFIED;  in detrunc()
308 		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),  in detrunc()
328 	struct msdosfsmount *pmp = dep->de_pmp;  in deextend()
335 	if (dep->de_vnode != NULL && !FAT32(pmp))  in deextend()
341 	if (dep->de_Attributes & ATTR_DIRECTORY)  in deextend()
344 	if (length <= dep->de_FileSize)  in deextend()
350 	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);  in deextend()
352 		if (count > pmp->pm_freeclustercount)  in deextend()
357 			(void) detrunc(dep, dep->de_FileSize, 0, cred);  in deextend()
367 	dep->de_FileSize = length;  in deextend()
368 	dep->de_flag |= DE_UPDATE | DE_MODIFIED;  in deextend()