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dm mpath: use more error codes

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This patch allows path errors from the multipath ctr function to
propagate up to userspace as errno values from the ioctl() call.

This is in response to
  https://www.redhat.com/archives/dm-devel/2008-May/msg00000.html
and
  https://bugzilla.redhat.com/show_bug.cgi?id=444421

The patch only lets through the errors that it needs to in order to
get the path errors from parse_path().

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Benjamin Marzinski 2008-10-10 13:36:57 +01:00 committed by Alasdair G Kergon
parent 3fa8749e58
commit 01460f3520
1 changed files with 12 additions and 10 deletions
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22
drivers/md/dm-mpath.c
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@ -563,12 +563,12 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
/* we need at least a path arg */
if (as->argc < 1) {
ti->error = "no device given";
return NULL;
return ERR_PTR(-EINVAL);
}
p = alloc_pgpath();
if (!p)
return NULL;
return ERR_PTR(-ENOMEM);
r = dm_get_device(ti, shift(as), ti->begin, ti->len,
dm_table_get_mode(ti->table), &p->path.dev);
@ -596,7 +596,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
bad:
free_pgpath(p);
return NULL;
return ERR_PTR(r);
}
static struct priority_group *parse_priority_group(struct arg_set *as,
@ -614,14 +614,14 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
if (as->argc < 2) {
as->argc = 0;
ti->error = "not enough priority group aruments";
return NULL;
ti->error = "not enough priority group arguments";
return ERR_PTR(-EINVAL);
}
pg = alloc_priority_group();
if (!pg) {
ti->error = "couldn't allocate priority group";
return NULL;
return ERR_PTR(-ENOMEM);
}
pg->m = m;
@ -654,8 +654,10 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
path_args.argv = as->argv;
pgpath = parse_path(&path_args, &pg->ps, ti);
if (!pgpath)
if (IS_ERR(pgpath)) {
r = PTR_ERR(pgpath);
goto bad;
}
pgpath->pg = pg;
list_add_tail(&pgpath->list, &pg->pgpaths);
@ -666,7 +668,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
bad:
free_priority_group(pg, ti);
return NULL;
return ERR_PTR(r);
}
static int parse_hw_handler(struct arg_set *as, struct multipath *m)
@ -785,8 +787,8 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
struct priority_group *pg;
pg = parse_priority_group(&as, m);
if (!pg) {
r = -EINVAL;
if (IS_ERR(pg)) {
r = PTR_ERR(pg);
goto bad;
}