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dm flakey: support feature args 

Add the ability to specify arbitrary feature flags when creating a
flakey target.  This code uses the same target argument helpers that
the multipath target does.

Also remove the superfluous 'dm-flakey' prefixes from the error messages,
as they already contain the prefix 'flakey'.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2011-08-02 12:32:05 +01:00 committed by Alasdair G Kergon
parent 30e4171bfe
commit dfd068b01f
1 changed files with 66 additions and 21 deletions
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87
drivers/md/dm-flakey.c
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@ -27,54 +27,99 @@ struct flakey_c {
unsigned down_interval;
};
static int parse_features(struct dm_arg_set *as, struct dm_target *ti)
{
int r;
unsigned argc;
const char *arg_name;
static struct dm_arg _args[] = {
{0, 0, "Invalid number of feature args"},
};
/* No feature arguments supplied. */
if (!as->argc)
return 0;
r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return -EINVAL;
while (argc && !r) {
arg_name = dm_shift_arg(as);
argc--;
ti->error = "Unrecognised flakey feature requested";
r = -EINVAL;
}
return r;
}
/*
* Construct a flakey mapping: <dev_path> <offset> <up interval> <down interval>
* Construct a flakey mapping:
* <dev_path> <offset> <up interval> <down interval> [<#feature args> [<arg>]*]
*/
static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct flakey_c *fc;
unsigned long long tmp;
static struct dm_arg _args[] = {
{0, UINT_MAX, "Invalid up interval"},
{0, UINT_MAX, "Invalid down interval"},
};
if (argc != 4) {
ti->error = "dm-flakey: Invalid argument count";
int r;
struct flakey_c *fc;
unsigned long long tmpll;
struct dm_arg_set as;
const char *devname;
as.argc = argc;
as.argv = argv;
if (argc < 4) {
ti->error = "Invalid argument count";
return -EINVAL;
}
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
if (!fc) {
ti->error = "dm-flakey: Cannot allocate linear context";
ti->error = "Cannot allocate linear context";
return -ENOMEM;
}
fc->start_time = jiffies;
if (sscanf(argv[1], "%llu", &tmp) != 1) {
ti->error = "dm-flakey: Invalid device sector";
goto bad;
}
fc->start = tmp;
devname = dm_shift_arg(&as);
if (sscanf(argv[2], "%u", &fc->up_interval) != 1) {
ti->error = "dm-flakey: Invalid up interval";
if (sscanf(dm_shift_arg(&as), "%llu", &tmpll) != 1) {
ti->error = "Invalid device sector";
goto bad;
}
fc->start = tmpll;
if (sscanf(argv[3], "%u", &fc->down_interval) != 1) {
ti->error = "dm-flakey: Invalid down interval";
r = dm_read_arg(_args, &as, &fc->up_interval, &ti->error);
if (r)
goto bad;
r = dm_read_arg(_args, &as, &fc->down_interval, &ti->error);
if (r)
goto bad;
}
if (!(fc->up_interval + fc->down_interval)) {
ti->error = "dm-flakey: Total (up + down) interval is zero";
ti->error = "Total (up + down) interval is zero";
goto bad;
}
if (fc->up_interval + fc->down_interval < fc->up_interval) {
ti->error = "dm-flakey: Interval overflow";
ti->error = "Interval overflow";
goto bad;
}
if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &fc->dev)) {
ti->error = "dm-flakey: Device lookup failed";
r = parse_features(&as, ti);
if (r)
goto bad;
if (dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev)) {
ti->error = "Device lookup failed";
goto bad;
}
@ -178,7 +223,7 @@ static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_
static struct target_type flakey_target = {
.name = "flakey",
.version = {1, 1, 0},
.version = {1, 2, 0},
.module = THIS_MODULE,
.ctr = flakey_ctr,
.dtr = flakey_dtr,