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udev: correctly handle partition #16 and later 

If a zvol has more than 15 partitions, the minor device number exhausts
the slot count reserved for partitions next to the zvol itself. As a
result, the minor number cannot be used to determine the partition
number for the higher partition, and doing so results in wrong named
symlinks being generated by udev.

Since the partition number is encoded in the block device name anyway,
let's just extract it from there instead.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Closes #15904
Closes #15970
This commit is contained in:
Fabian-Gruenbichler 2024-03-22 00:38:24 +01:00 committed by Tony Hutter
parent fa2cbd4007
commit 3fb0942cc5
1 changed files with 5 additions and 4 deletions
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9
udev/zvol_id.c
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@ -51,7 +51,7 @@ const char *__asan_default_options(void) {
int
main(int argc, const char *const *argv)
{
if (argc != 2) {
if (argc != 2 || strncmp(argv[1], "/dev/zd", 7) != 0) {
fprintf(stderr, "usage: %s /dev/zdX\n", argv[0]);
return (1);
}
@ -72,9 +72,10 @@ main(int argc, const char *const *argv)
return (1);
}
unsigned int dev_part = minor(sb.st_rdev) % ZVOL_MINORS;
if (dev_part != 0)
sprintf(zvol_name + strlen(zvol_name), "-part%u", dev_part);
const char *dev_part = strrchr(dev_name, 'p');
if (dev_part != NULL) {
sprintf(zvol_name + strlen(zvol_name), "-part%s", dev_part + 1);
}
for (size_t i = 0; i < strlen(zvol_name); ++i)
if (isblank(zvol_name[i]))