dev/vn/vn.c

7  * as defined in and that are subject to the Apple Public Source License
9  * compliance with the License. The rights granted to you under the License
10  * may not be used to create, or enable the creation or redistribution of,
11  * unlawful or unlicensed copies of an Apple operating system, or to
34  * This code is derived from software contributed to Berkeley by
51  *    may be used to endorse or promote products derived from this software
75  * Block/character interface to a vnode.  Allows one to treat a file
78  * NOTE 1: This uses the vnop_blockmap/vnop_strategy interface to the vnode
79  * instead of a simple VOP_RDWR.  We do this to avoid distorting the
83  * Once mounted all access to the contents of the "mapped" file via
140  *	D_DISK		we want to look like a disk
201 static void vn_ioctl_to_64(struct vn_ioctl_32 *from, struct vn_ioctl_64 *to);
310 		/* figure out which blocks to read */
367 	/* write one block to shadow file at shadow_block offset */
402 		/* figure out which blocks to write */
427 			/* truncate the file to its new length before write */
441 				/* copy the last block to the shadow */
451 					printf("vnwrite_shadow: failed to copy"
452 					       " block %u to shadow block %u\n",
460 			/* copy the first block to the shadow */
465 				printf("vnwrite_shadow: failed to"
466 				       " copy block %u to shadow block %u\n",
719 			/* truncate the file to its new length before write */
1124  *	Attach a file to a VN partition.  Return the size in the vn_size
1283  * to this "disk" is essentially as root.  Note that credentials may change
1284  * if some other uid can write directly to the mapped file (NFS).
1294 	 * Horrible kludge to establish credentials for NFS  XXX.
1400 vn_ioctl_to_64(struct vn_ioctl_32 *from, struct vn_ioctl_64 *to)
1402 	to->vn_file = CAST_USER_ADDR_T(from->vn_file);
1403 	to->vn_size = from->vn_size;
1404 	to->vn_control = from->vn_control;