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-rw-r--r--sys-utils/losetup.c157
1 files changed, 117 insertions, 40 deletions
diff --git a/sys-utils/losetup.c b/sys-utils/losetup.c
index 1705379..7134542 100644
--- a/sys-utils/losetup.c
+++ b/sys-utils/losetup.c
@@ -1,6 +1,14 @@
/*
- * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
- * Originally from Ted's losetup.c
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Original implementation from Ted Ts'o; losetup was part of mount.
+ *
+ * Copyright (C) 2011-2023 Karel Zak <kzak@redhat.com>
*
* losetup.c - setup and control loop devices
*/
@@ -45,9 +53,14 @@ enum {
COL_BACK_FILE,
COL_BACK_INO,
COL_BACK_MAJMIN,
+ COL_BACK_MAJ,
+ COL_BACK_MIN,
COL_MAJMIN,
+ COL_MAJ,
+ COL_MIN,
COL_OFFSET,
COL_PARTSCAN,
+ COL_REF,
COL_RO,
COL_SIZELIMIT,
COL_DIO,
@@ -60,7 +73,7 @@ static int raw;
static int json;
struct colinfo {
- const char *name;
+ const char * const name;
double whint;
int flags;
const char *help;
@@ -68,17 +81,22 @@ struct colinfo {
int json_type; /* default is string */
};
-static struct colinfo infos[] = {
+static const struct colinfo infos[] = {
[COL_AUTOCLR] = { "AUTOCLEAR", 1, SCOLS_FL_RIGHT, N_("autoclear flag set"), SCOLS_JSON_BOOLEAN},
[COL_BACK_FILE] = { "BACK-FILE", 0.3, SCOLS_FL_NOEXTREMES, N_("device backing file")},
[COL_BACK_INO] = { "BACK-INO", 4, SCOLS_FL_RIGHT, N_("backing file inode number"), SCOLS_JSON_NUMBER},
[COL_BACK_MAJMIN] = { "BACK-MAJ:MIN", 6, 0, N_("backing file major:minor device number")},
+ [COL_BACK_MAJ] = { "BACK-MAJ", 6, 0, N_("backing file major device number")},
+ [COL_BACK_MIN] = { "BACK-MIN", 6, 0, N_("backing file minor device number")},
[COL_NAME] = { "NAME", 0.25, 0, N_("loop device name")},
[COL_OFFSET] = { "OFFSET", 5, SCOLS_FL_RIGHT, N_("offset from the beginning"), SCOLS_JSON_NUMBER},
[COL_PARTSCAN] = { "PARTSCAN", 1, SCOLS_FL_RIGHT, N_("partscan flag set"), SCOLS_JSON_BOOLEAN},
+ [COL_REF] = { "REF", 0.1, 0, N_("loop device reference string")},
[COL_RO] = { "RO", 1, SCOLS_FL_RIGHT, N_("read-only device"), SCOLS_JSON_BOOLEAN},
[COL_SIZELIMIT] = { "SIZELIMIT", 5, SCOLS_FL_RIGHT, N_("size limit of the file in bytes"), SCOLS_JSON_NUMBER},
[COL_MAJMIN] = { "MAJ:MIN", 3, 0, N_("loop device major:minor number")},
+ [COL_MAJ] = { "MAJ", 1, SCOLS_FL_RIGHT, N_("loop device major number"), SCOLS_JSON_NUMBER},
+ [COL_MIN] = { "MIN", 1, SCOLS_FL_RIGHT, N_("loop device minor number"), SCOLS_JSON_NUMBER},
[COL_DIO] = { "DIO", 1, SCOLS_FL_RIGHT, N_("access backing file with direct-io"), SCOLS_JSON_BOOLEAN},
[COL_LOGSEC] = { "LOG-SEC", 4, SCOLS_FL_RIGHT, N_("logical sector size in bytes"), SCOLS_JSON_NUMBER},
};
@@ -94,7 +112,7 @@ static int get_column_id(int num)
return columns[num];
}
-static struct colinfo *get_column_info(int num)
+static const struct colinfo *get_column_info(int num)
{
return &infos[ get_column_id(num) ];
}
@@ -133,23 +151,26 @@ static int printf_loopdev(struct loopdev_cxt *lc)
* Probably non-root user (no permissions to
* call LOOP_GET_STATUS ioctls).
*/
- printf("%s: []: (%s)",
- loopcxt_get_device(lc), fname);
+ printf("%s%s: []: (%s)",
+ loopcxt_get_device(lc),
+ loopcxt_is_lost(lc) ? " (lost)" : "",
+ fname);
if (loopcxt_get_offset(lc, &x) == 0 && x)
printf(_(", offset %ju"), x);
-
if (loopcxt_get_sizelimit(lc, &x) == 0 && x)
printf(_(", sizelimit %ju"), x);
+
goto done;
}
- printf("%s: [%04jd]:%ju (%s)",
- loopcxt_get_device(lc), (intmax_t) dev, (uintmax_t) ino, fname);
+ printf("%s%s: [%04jd]:%ju (%s)",
+ loopcxt_get_device(lc),
+ loopcxt_is_lost(lc) ? " (lost)" : "",
+ (intmax_t) dev, (uintmax_t) ino, fname);
if (loopcxt_get_offset(lc, &x) == 0 && x)
printf(_(", offset %ju"), x);
-
if (loopcxt_get_sizelimit(lc, &x) == 0 && x)
printf(_(", sizelimit %ju"), x);
@@ -200,11 +221,24 @@ static int show_all_loops(struct loopdev_cxt *lc, const char *file,
return 0;
}
+static void warn_lost(struct loopdev_cxt *lc)
+{
+ dev_t devno = loopcxt_get_devno(lc);
+
+ if (devno <= 0)
+ return;
+
+ warnx(("device node %s (%u:%u) is lost. You may use mknod(1) to recover it."),
+ loopcxt_get_device(lc), major(devno), minor(devno));
+}
+
static int delete_loop(struct loopdev_cxt *lc)
{
- if (loopcxt_delete_device(lc))
+ if (loopcxt_delete_device(lc)) {
warn(_("%s: detach failed"), loopcxt_get_device(lc));
- else
+ if (loopcxt_is_lost(lc))
+ warn_lost(lc);
+ } else
return 0;
return -1;
@@ -237,6 +271,10 @@ static int set_scols_data(struct loopdev_cxt *lc, struct libscols_line *ln)
switch(get_column_id(i)) {
case COL_NAME:
p = loopcxt_get_device(lc);
+ if (loopcxt_is_lost(lc)) {
+ xasprintf(&np, "%s (lost)", p);
+ p = NULL;
+ }
break;
case COL_BACK_FILE:
np = loopcxt_get_backing_file(lc);
@@ -257,16 +295,38 @@ static int set_scols_data(struct loopdev_cxt *lc, struct libscols_line *ln)
major(dev), minor(dev));
break;
}
+ case COL_BACK_MAJ:
+ {
+ dev_t dev = 0;
+ if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev)
+ xasprintf(&np, "%u", major(dev));
+ break;
+ }
+ case COL_BACK_MIN:
+ {
+ dev_t dev = 0;
+ if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev)
+ xasprintf(&np, "%u", minor(dev));
+ break;
+ }
case COL_MAJMIN:
{
- struct stat st;
-
- if (loopcxt_get_device(lc)
- && stat(loopcxt_get_device(lc), &st) == 0
- && S_ISBLK(st.st_mode)
- && major(st.st_rdev) == LOOPDEV_MAJOR)
+ dev_t dev = loopcxt_get_devno(lc);
+ if (dev)
xasprintf(&np, raw || json ? "%u:%u" :"%3u:%-3u",
- major(st.st_rdev), minor(st.st_rdev));
+ major(dev), minor(dev));
+ break;
+ }
+ case COL_MAJ: {
+ dev_t dev = loopcxt_get_devno(lc);
+ if (dev)
+ xasprintf(&np, "%u", major(dev));
+ break;
+ }
+ case COL_MIN: {
+ dev_t dev = loopcxt_get_devno(lc);
+ if (dev)
+ xasprintf(&np, "%u", minor(dev));
break;
}
case COL_BACK_INO:
@@ -292,6 +352,9 @@ static int set_scols_data(struct loopdev_cxt *lc, struct libscols_line *ln)
if (loopcxt_get_blocksize(lc, &x) == 0)
xasprintf(&np, "%jd", x);
break;
+ case COL_REF:
+ np = loopcxt_get_refname(lc);
+ break;
default:
return -EINVAL;
}
@@ -332,7 +395,7 @@ static int show_table(struct loopdev_cxt *lc,
scols_table_set_name(tb, "loopdevices");
for (i = 0; i < ncolumns; i++) {
- struct colinfo *ci = get_column_info(i);
+ const struct colinfo *ci = get_column_info(i);
struct libscols_column *cl;
cl = scols_table_new_column(tb, ci->name, ci->whint, ci->flags);
@@ -424,6 +487,7 @@ static void __attribute__((__noreturn__)) usage(void)
fputs(_(" -P, --partscan create a partitioned loop device\n"), out);
fputs(_(" -r, --read-only set up a read-only loop device\n"), out);
fputs(_(" --direct-io[=<on|off>] open backing file with O_DIRECT\n"), out);
+ fputs(_(" --loop-ref <string> loop device reference\n"), out);
fputs(_(" --show print device name after setup (with -f)\n"), out);
fputs(_(" -v, --verbose verbose mode\n"), out);
@@ -437,13 +501,13 @@ static void __attribute__((__noreturn__)) usage(void)
fputs(_(" --raw use raw --list output format\n"), out);
fputs(USAGE_SEPARATOR, out);
- printf(USAGE_HELP_OPTIONS(31));
+ fprintf(out, USAGE_HELP_OPTIONS(31));
fputs(USAGE_COLUMNS, out);
for (i = 0; i < ARRAY_SIZE(infos); i++)
fprintf(out, " %12s %s\n", infos[i].name, _(infos[i].help));
- printf(USAGE_MAN_TAIL("losetup(8)"));
+ fprintf(out, USAGE_MAN_TAIL("losetup(8)"));
exit(EXIT_SUCCESS);
}
@@ -466,8 +530,8 @@ static void warn_size(const char *filename, uint64_t size, uint64_t offset, int
"may be useless or invisible for system tools."),
filename);
else if (size % 512)
- warnx(_("%s: Warning: file does not fit into a 512-byte sector; "
- "the end of the file will be ignored."),
+ warnx(_("%s: Warning: file does not end on a 512-byte sector boundary; "
+ "the remaining end of the file will be ignored."),
filename);
}
@@ -492,7 +556,8 @@ static int find_unused(struct loopdev_cxt *lc)
static int create_loop(struct loopdev_cxt *lc,
int nooverlap, int lo_flags, int flags,
- const char *file, uint64_t offset, uint64_t sizelimit,
+ const char *file, const char *refname,
+ uint64_t offset, uint64_t sizelimit,
uint64_t blocksize)
{
int hasdev = loopcxt_has_device(lc);
@@ -581,7 +646,10 @@ static int create_loop(struct loopdev_cxt *lc,
loopcxt_set_flags(lc, lo_flags);
if (blocksize > 0)
loopcxt_set_blocksize(lc, blocksize);
-
+ if (refname && (rc = loopcxt_set_refname(lc, refname))) {
+ warnx(_("cannot set loop reference string"));
+ break;
+ }
if ((rc = loopcxt_set_backing_file(lc, file))) {
warn(_("%s: failed to use backing file"), file);
break;
@@ -598,7 +666,7 @@ static int create_loop(struct loopdev_cxt *lc,
}
/* errors */
- errpre = hasdev && loopcxt_get_fd(lc) < 0 ?
+ errpre = hasdev && lc->fd < 0 ?
loopcxt_get_device(lc) : file;
warn(_("%s: failed to set up loop device"), errpre);
break;
@@ -611,7 +679,7 @@ int main(int argc, char **argv)
{
struct loopdev_cxt lc;
int act = 0, flags = 0, no_overlap = 0, c;
- char *file = NULL;
+ char *file = NULL, *refname = NULL;
uint64_t offset = 0, sizelimit = 0, blocksize = 0;
int res = 0, showdev = 0, lo_flags = 0;
char *outarg = NULL;
@@ -622,6 +690,7 @@ int main(int argc, char **argv)
OPT_SIZELIMIT = CHAR_MAX + 1,
OPT_SHOW,
OPT_RAW,
+ OPT_REF,
OPT_DIO,
OPT_OUTPUT_ALL
};
@@ -646,6 +715,7 @@ int main(int argc, char **argv)
{ "read-only", no_argument, NULL, 'r' },
{ "direct-io", optional_argument, NULL, OPT_DIO },
{ "raw", no_argument, NULL, OPT_RAW },
+ { "loop-ref", required_argument, NULL, OPT_REF, },
{ "show", no_argument, NULL, OPT_SHOW },
{ "verbose", no_argument, NULL, 'v' },
{ "version", no_argument, NULL, 'V' },
@@ -684,18 +754,19 @@ int main(int argc, char **argv)
break;
case 'c':
act = A_SET_CAPACITY;
- if (!is_loopdev(optarg) ||
- loopcxt_set_device(&lc, optarg))
+ if (loopcxt_set_device(&lc, optarg))
err(EXIT_FAILURE, _("%s: failed to use device"),
optarg);
break;
case 'r':
lo_flags |= LO_FLAGS_READ_ONLY;
break;
+ case OPT_REF:
+ refname = optarg;
+ break;
case 'd':
act = A_DELETE;
- if (!is_loopdev(optarg) ||
- loopcxt_set_device(&lc, optarg))
+ if (loopcxt_set_device(&lc, optarg))
err(EXIT_FAILURE, _("%s: failed to use device"),
optarg);
break;
@@ -733,6 +804,7 @@ int main(int argc, char **argv)
list = 1;
break;
case OPT_OUTPUT_ALL:
+ list = 1;
for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++)
columns[ncolumns] = ncolumns;
break;
@@ -822,8 +894,7 @@ int main(int argc, char **argv)
else
act = A_SHOW_ONE;
- if (!is_loopdev(argv[optind]) ||
- loopcxt_set_device(&lc, argv[optind]))
+ if (loopcxt_set_device(&lc, argv[optind]))
err(EXIT_FAILURE, _("%s: failed to use device"),
argv[optind]);
optind++;
@@ -863,7 +934,7 @@ int main(int argc, char **argv)
switch (act) {
case A_CREATE:
- res = create_loop(&lc, no_overlap, lo_flags, flags, file,
+ res = create_loop(&lc, no_overlap, lo_flags, flags, file, refname,
offset, sizelimit, blocksize);
if (res == 0) {
if (showdev)
@@ -874,8 +945,7 @@ int main(int argc, char **argv)
case A_DELETE:
res = delete_loop(&lc);
while (optind < argc) {
- if (!is_loopdev(argv[optind]) ||
- loopcxt_set_device(&lc, argv[optind]))
+ if (loopcxt_set_device(&lc, argv[optind]))
warn(_("%s: failed to use device"),
argv[optind]);
optind++;
@@ -888,7 +958,8 @@ int main(int argc, char **argv)
case A_FIND_FREE:
res = find_unused(&lc);
if (!res)
- printf("%s\n", loopcxt_get_device(&lc));
+ printf("%s%s\n", loopcxt_get_device(&lc),
+ loopcxt_is_lost(&lc) ? " (lost)" : "");
break;
case A_SHOW:
if (list)
@@ -928,7 +999,13 @@ int main(int argc, char **argv)
break;
}
+ if (res && (act == A_SET_CAPACITY
+ || act == A_CREATE
+ || act == A_SET_DIRECT_IO
+ || act == A_SET_BLOCKSIZE)
+ && loopcxt_is_lost(&lc))
+ warn_lost(&lc);
+
loopcxt_deinit(&lc);
return res ? EXIT_FAILURE : EXIT_SUCCESS;
}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 22:45:51 +0000