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init: refactor devt_from_partuuid 

The code in devt_from_partuuid is very convoluted.  Refactor a bit by
sanitizing the goto and variable name usage.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-14 19:35:28 +01:00 committed by Jens Axboe
parent c2637e80a0
commit e036bb8e0c
1 changed files with 31 additions and 37 deletions
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68
init/do_mounts.c
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@ -105,13 +105,10 @@ static int match_dev_by_uuid(struct device *dev, const void *data)
*/
static dev_t devt_from_partuuid(const char *uuid_str)
{
dev_t res = 0;
struct uuidcmp cmp;
struct device *dev = NULL;
struct gendisk *disk;
struct hd_struct *part;
dev_t devt = 0;
int offset = 0;
bool clear_root_wait = false;
char *slash;
cmp.uuid = uuid_str;
@ -120,52 +117,49 @@ static dev_t devt_from_partuuid(const char *uuid_str)
/* Check for optional partition number offset attributes. */
if (slash) {
char c = 0;
/* Explicitly fail on poor PARTUUID syntax. */
if (sscanf(slash + 1,
"PARTNROFF=%d%c", &offset, &c) != 1) {
clear_root_wait = true;
goto done;
}
if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1)
goto clear_root_wait;
cmp.len = slash - uuid_str;
} else {
cmp.len = strlen(uuid_str);
}
if (!cmp.len) {
clear_root_wait = true;
goto done;
}
if (!cmp.len)
goto clear_root_wait;
dev = class_find_device(&block_class, NULL, &cmp,
&match_dev_by_uuid);
dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid);
if (!dev)
goto done;
return 0;
res = dev->devt;
if (offset) {
/*
* Attempt to find the requested partition by adding an offset
* to the partition number found by UUID.
*/
struct hd_struct *part;
/* Attempt to find the partition by offset. */
if (!offset)
goto no_offset;
res = 0;
disk = part_to_disk(dev_to_part(dev));
part = disk_get_part(disk, dev_to_part(dev)->partno + offset);
if (part) {
res = part_devt(part);
put_device(part_to_dev(part));
part = disk_get_part(dev_to_disk(dev),
dev_to_part(dev)->partno + offset);
if (part) {
devt = part_devt(part);
put_device(part_to_dev(part));
}
} else {
devt = dev->devt;
}
no_offset:
put_device(dev);
done:
if (clear_root_wait) {
pr_err("VFS: PARTUUID= is invalid.\n"
"Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
if (root_wait)
pr_err("Disabling rootwait; root= is invalid.\n");
root_wait = 0;
}
return res;
return devt;
clear_root_wait:
pr_err("VFS: PARTUUID= is invalid.\n"
"Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
if (root_wait)
pr_err("Disabling rootwait; root= is invalid.\n");
root_wait = 0;
return 0;
}
/**