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Masterwork From Distant Lands
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Authored By
cem
Nov 30 2018, 6:10 AM
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4 KB
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Masterwork From Distant Lands
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Index: Makefile
===================================================================
--- Makefile (revision 341286)
+++ Makefile (working copy)
@@ -2,6 +2,6 @@
PROG= trim
MAN= trim.8
-LIBADD= util
+LIBADD= geom util
.include <bsd.prog.mk>
Index: trim.c
===================================================================
--- trim.c (revision 341286)
+++ trim.c (working copy)
@@ -42,13 +42,14 @@
#include <sysexits.h>
#include <unistd.h>
+#include <libgeom.h>
+
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
-static int trim(char *path, off_t offset, off_t length, int dryrun, int verbose);
-static off_t getsize(char *path);
+static off_t getsize(const char *path, int fd);
static void usage(char *name) __dead2;
int
@@ -56,7 +57,7 @@
{
off_t offset, length;
uint64_t usz;
- int ch, dryrun, error, verbose;
+ int fd, ch, dryrun, error, verbose;
char *fname, *name;
error = 0;
@@ -91,10 +92,14 @@
verbose = 0;
break;
case 'r':
- if ((length = getsize(optarg)) == 0)
+ fd = open(optarg, O_RDONLY);
+ if (fd < 0)
+ err(EX_NOINPUT, "couldn't open '%s'", optarg);
+ if ((length = getsize(optarg, fd)) == 0)
errx(EX_USAGE,
"invalid zero length reference file"
" for the region: `%s'", optarg);
+ close(fd);
break;
case 'v':
verbose = 1;
@@ -110,98 +115,51 @@
if (argc < 1)
usage(name);
- while ((fname = *argv++) != NULL)
- if (trim(fname, offset, length, dryrun, verbose) < 0)
+ /*
+ * XXX it seems really dubious to apply the same offset/length TRIM to
+ * more than one device/file ...
+ */
+ while ((fname = *argv++) != NULL) {
+ fd = open(fname, O_RDONLY);
+ if (fd < 0) {
+ warn("couldn't open '%s'", optarg);
error++;
+ continue;
+ }
+ if (verbose)
+ printf("trim '%s' offset %ju length %ju\n", fname,
+ (uintmax_t)offset, (uintmax_t)length);
+ if (!dryrun && g_delete(fd, offset, length) < 0)
+ error++;
+ }
+
return (error ? EXIT_FAILURE : EXIT_SUCCESS);
}
static off_t
-getsize(char *path)
+getsize(const char *path, int fd)
{
struct stat sb;
- char *tstr;
off_t mediasize;
- int fd;
- if ((fd = open(path, O_RDONLY | O_DIRECT)) < 0) {
- if (errno == ENOENT && path[0] != '/') {
- if (asprintf(&tstr, "%s%s", _PATH_DEV, path) < 0)
- errx(EX_OSERR, "no memory");
- fd = open(tstr, O_RDONLY | O_DIRECT);
- free(tstr);
- }
- }
-
- if (fd < 0)
- err(EX_NOINPUT, "`%s'", path);
-
if (fstat(fd, &sb) < 0)
- err(EX_IOERR, "`%s'", path);
+ err(EX_OSERR, "stat");
- if (S_ISREG(sb.st_mode) || S_ISDIR(sb.st_mode)) {
- close(fd);
+ if (S_ISREG(sb.st_mode))
return (sb.st_size);
- }
- if (!S_ISCHR(sb.st_mode) && !S_ISBLK(sb.st_mode))
+ if (!S_ISCHR(sb.st_mode))
errx(EX_DATAERR,
- "invalid type of the file "
- "(not regular, directory nor special device): `%s'",
- path);
+ "%s: invalid type (not regular nor special device)", path);
- if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) < 0)
- errx(EX_UNAVAILABLE,
- "ioctl(DIOCGMEDIASIZE) failed, probably not a disk: "
- "`%s'", path);
- close(fd);
+ mediasize = g_mediasize(fd);
+ if (mediasize < 0)
+ errx(EX_UNAVAILABLE, "%s: g_mediasize", path);
return (mediasize);
}
-static int
-trim(char *path, off_t offset, off_t length, int dryrun, int verbose)
-{
- off_t arg[2];
- char *tstr;
- int error, fd;
-
- if (length == 0)
- length = getsize(path);
-
- if (verbose)
- printf("trim `%s' offset %ju length %ju\n",
- path, (uintmax_t)offset, (uintmax_t)length);
-
- if (dryrun) {
- printf("dry run: add -f to actually perform the operation\n");
- return (0);
- }
-
- if ((fd = open(path, O_WRONLY | O_DIRECT)) < 0) {
- if (errno == ENOENT && path[0] != '/') {
- if (asprintf(&tstr, "%s%s", _PATH_DEV, path) < 0)
- errx(EX_OSERR, "no memory");
- fd = open(tstr, O_WRONLY | O_DIRECT);
- free(tstr);
- }
- }
-
- if (fd < 0)
- err(EX_NOINPUT, "`%s'", path);
-
- arg[0] = offset;
- arg[1] = length;
-
- error = ioctl(fd, DIOCGDELETE, arg);
- if (error < 0)
- warn("ioctl(DIOCGDELETE) failed for `%s'", path);
-
- close(fd);
- return (error);
-}
-
static void
usage(char *name)
{

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