62  * each mapping request has an additional 16Kb added to it - mappings over
63  * 4Mb will be rounded to a 4Mb boundary - thus if there were 8mb, adding
64  * in the 16Kb overhead the mapping would use another 4Mb-16kb - that is
68 #define	MAXMAPSIZE	(1024*1024*8)-(1024*16)	/* map at most 8MB */
73  * Description:	fast copy of file - use mmap()/write() loop if possible
74  * Arguments:	char *srcPath - name of source file to copy from
75  *		char *dstPath - name of target file to copy to
77  *			== 0 - replicate source file access/modification times
78  *			!= 0 - use specified time for access/modification times
80  *		== 0 - successful
81  *		!= 0 - failure
99 		return (-1);  in copyf()
107 		return (-1);  in copyf()
125 					return (-1);  in copyf()
138 			return (-1);  in copyf()
153 	 * -- a_mytime == 0: replicate source file access/modification times  in copyf()
154 	 * -- otherwise: use a_mytime for file access/modification times  in copyf()
169 		return (-1);  in copyf()
176 		return (-1);  in copyf()
186  * Description:	fast copy of file - use mmap()/write() loop if possible
187  * Arguments:	int srcFd - file descriptor open on source file
188  *		int dstFd - file descriptor open on target file
189  *		char *srcPath - name of source file (for error messages)
190  *		char *dstPath - name of target file (for error messages)
191  *		struct stat *a_srcStatbuf - stat structure for source file
192  *		long a_iosize - preferred io size for read/write loop
194  *		== 0 - successful
195  *		!= 0 - failure
203 	off_t	filesize = a_srcStatbuf->st_size;  in copyFile()
215 	if (S_ISREG(a_srcStatbuf->st_mode) && (filesize > SMALLFILESIZE)) {  in copyFile()
228 		 * remember size of mapping to "unmap" - if the source file  in copyFile()
246 	 * if the source was not mapped into memory, copy via read/write loop  in copyFile()
277 			/* read next block of data */  in copyFile()
279 			n = read(a_srcFd, buf, blocksize);  in copyFile()
281 				/* end of file - return success */  in copyFile()
285 				/* read error - return error */  in copyFile()
292 			/* write out block of data just read in */  in copyFile()
295 				/* short write/write error - return error */  in copyFile()
324 			remains = mapsize - nbytes;  in copyFile()
327 					(cp + mapsize - remains), remains);  in copyFile()
329 					remains -= nbytes;  in copyFile()
336 				/* i/o error - report and exit */  in copyFile()
354 		 * as a possible errno, it is set when the nfs read  in copyFile()
374 		filesize -= nbytes;  in copyFile()
408  *		a file that is local to the current system - if the file is not
411  * Arguments:	a_path - [RO, *RO] - (char *)
414  *		a_oflag - [RO, *RO] - (int)
416  *		a_tmpdir - [RO, *RO] - (char *)
422  *			>= 0 - file descriptor opened on the file
423  *			== -1 - failed to open - errno contains error code
426  *		file descriptor opened on the file is closed - there is no need
456 	 * source file is remote - must make a local copy  in openLocal()
466 		return (-1);  in openLocal()
478 		a_tmpdir, a_tmpdir[n-1] == '/' ? "" : "/", bn);  in openLocal()
506 		return (-1);  in openLocal()