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dm table: share target argument parsing functions
Move multipath target argument parsing code into dm-table so other targets can share it. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer
committed by
Alasdair G Kergon
Alasdair G Kergon
parent
a6e50b409d
commit
498f0103ea
+44
-108
@@ -22,7 +22,6 @@
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#include <linux/atomic.h>
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#define DM_MSG_PREFIX "multipath"
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#define MESG_STR(x) x, sizeof(x)
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#define DM_PG_INIT_DELAY_MSECS 2000
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#define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1)
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@@ -505,80 +504,29 @@ static void trigger_event(struct work_struct *work)
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* <#paths> <#per-path selector args>
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* [<path> [<arg>]* ]+ ]+
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*---------------------------------------------------------------*/
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struct param {
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unsigned min;
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unsigned max;
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char *error;
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};
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static int read_param(struct param *param, char *str, unsigned *v, char **error)
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{
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if (!str ||
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(sscanf(str, "%u", v) != 1) ||
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(*v < param->min) ||
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(*v > param->max)) {
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*error = param->error;
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return -EINVAL;
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}
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return 0;
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}
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struct arg_set {
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unsigned argc;
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char **argv;
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};
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static char *shift(struct arg_set *as)
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{
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char *r;
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if (as->argc) {
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as->argc--;
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r = *as->argv;
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as->argv++;
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return r;
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}
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return NULL;
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}
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static void consume(struct arg_set *as, unsigned n)
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{
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BUG_ON (as->argc < n);
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as->argc -= n;
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as->argv += n;
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}
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static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
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static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
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struct dm_target *ti)
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{
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int r;
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struct path_selector_type *pst;
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unsigned ps_argc;
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static struct param _params[] = {
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static struct dm_arg _args[] = {
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{0, 1024, "invalid number of path selector args"},
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};
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pst = dm_get_path_selector(shift(as));
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pst = dm_get_path_selector(dm_shift_arg(as));
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if (!pst) {
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ti->error = "unknown path selector type";
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return -EINVAL;
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}
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r = read_param(_params, shift(as), &ps_argc, &ti->error);
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r = dm_read_arg_group(_args, as, &ps_argc, &ti->error);
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if (r) {
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dm_put_path_selector(pst);
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return -EINVAL;
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}
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if (ps_argc > as->argc) {
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dm_put_path_selector(pst);
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ti->error = "not enough arguments for path selector";
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return -EINVAL;
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}
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r = pst->create(&pg->ps, ps_argc, as->argv);
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if (r) {
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dm_put_path_selector(pst);
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@@ -587,12 +535,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
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}
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pg->ps.type = pst;
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consume(as, ps_argc);
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dm_consume_args(as, ps_argc);
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return 0;
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}
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static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
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static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps,
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struct dm_target *ti)
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{
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int r;
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@@ -609,7 +557,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
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if (!p)
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return ERR_PTR(-ENOMEM);
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r = dm_get_device(ti, shift(as), dm_table_get_mode(ti->table),
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r = dm_get_device(ti, dm_shift_arg(as), dm_table_get_mode(ti->table),
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&p->path.dev);
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if (r) {
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ti->error = "error getting device";
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@@ -660,16 +608,16 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
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return ERR_PTR(r);
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}
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static struct priority_group *parse_priority_group(struct arg_set *as,
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static struct priority_group *parse_priority_group(struct dm_arg_set *as,
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struct multipath *m)
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{
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static struct param _params[] = {
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static struct dm_arg _args[] = {
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{1, 1024, "invalid number of paths"},
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{0, 1024, "invalid number of selector args"}
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};
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int r;
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unsigned i, nr_selector_args, nr_params;
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unsigned i, nr_selector_args, nr_args;
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struct priority_group *pg;
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struct dm_target *ti = m->ti;
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@@ -693,26 +641,26 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
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/*
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* read the paths
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*/
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r = read_param(_params, shift(as), &pg->nr_pgpaths, &ti->error);
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r = dm_read_arg(_args, as, &pg->nr_pgpaths, &ti->error);
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if (r)
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goto bad;
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r = read_param(_params + 1, shift(as), &nr_selector_args, &ti->error);
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r = dm_read_arg(_args + 1, as, &nr_selector_args, &ti->error);
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if (r)
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goto bad;
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nr_params = 1 + nr_selector_args;
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nr_args = 1 + nr_selector_args;
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for (i = 0; i < pg->nr_pgpaths; i++) {
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struct pgpath *pgpath;
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struct arg_set path_args;
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struct dm_arg_set path_args;
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if (as->argc < nr_params) {
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if (as->argc < nr_args) {
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ti->error = "not enough path parameters";
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r = -EINVAL;
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goto bad;
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}
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path_args.argc = nr_params;
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path_args.argc = nr_args;
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path_args.argv = as->argv;
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pgpath = parse_path(&path_args, &pg->ps, ti);
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@@ -723,7 +671,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
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pgpath->pg = pg;
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list_add_tail(&pgpath->list, &pg->pgpaths);
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consume(as, nr_params);
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dm_consume_args(as, nr_args);
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}
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return pg;
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@@ -733,28 +681,23 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
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return ERR_PTR(r);
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}
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static int parse_hw_handler(struct arg_set *as, struct multipath *m)
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static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
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{
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unsigned hw_argc;
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int ret;
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struct dm_target *ti = m->ti;
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static struct param _params[] = {
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static struct dm_arg _args[] = {
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{0, 1024, "invalid number of hardware handler args"},
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};
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if (read_param(_params, shift(as), &hw_argc, &ti->error))
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if (dm_read_arg_group(_args, as, &hw_argc, &ti->error))
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return -EINVAL;
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if (!hw_argc)
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return 0;
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if (hw_argc > as->argc) {
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ti->error = "not enough arguments for hardware handler";
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return -EINVAL;
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}
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m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL);
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m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
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request_module("scsi_dh_%s", m->hw_handler_name);
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if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
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ti->error = "unknown hardware handler type";
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@@ -778,7 +721,7 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
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for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1)
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j = sprintf(p, "%s", as->argv[i]);
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}
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consume(as, hw_argc - 1);
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dm_consume_args(as, hw_argc - 1);
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return 0;
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fail:
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@@ -787,52 +730,45 @@ fail:
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return ret;
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}
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static int parse_features(struct arg_set *as, struct multipath *m)
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static int parse_features(struct dm_arg_set *as, struct multipath *m)
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{
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int r;
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unsigned argc;
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struct dm_target *ti = m->ti;
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const char *param_name;
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const char *arg_name;
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static struct param _params[] = {
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static struct dm_arg _args[] = {
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{0, 5, "invalid number of feature args"},
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{1, 50, "pg_init_retries must be between 1 and 50"},
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{0, 60000, "pg_init_delay_msecs must be between 0 and 60000"},
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};
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r = read_param(_params, shift(as), &argc, &ti->error);
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r = dm_read_arg_group(_args, as, &argc, &ti->error);
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if (r)
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return -EINVAL;
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if (!argc)
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return 0;
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if (argc > as->argc) {
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ti->error = "not enough arguments for features";
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return -EINVAL;
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}
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do {
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param_name = shift(as);
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arg_name = dm_shift_arg(as);
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argc--;
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if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) {
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if (!strcasecmp(arg_name, "queue_if_no_path")) {
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r = queue_if_no_path(m, 1, 0);
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continue;
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}
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if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
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if (!strcasecmp(arg_name, "pg_init_retries") &&
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(argc >= 1)) {
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r = read_param(_params + 1, shift(as),
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&m->pg_init_retries, &ti->error);
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r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error);
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argc--;
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continue;
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}
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if (!strnicmp(param_name, MESG_STR("pg_init_delay_msecs")) &&
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if (!strcasecmp(arg_name, "pg_init_delay_msecs") &&
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(argc >= 1)) {
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r = read_param(_params + 2, shift(as),
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&m->pg_init_delay_msecs, &ti->error);
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r = dm_read_arg(_args + 2, as, &m->pg_init_delay_msecs, &ti->error);
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argc--;
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continue;
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}
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@@ -847,15 +783,15 @@ static int parse_features(struct arg_set *as, struct multipath *m)
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static int multipath_ctr(struct dm_target *ti, unsigned int argc,
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char **argv)
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{
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/* target parameters */
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static struct param _params[] = {
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/* target arguments */
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static struct dm_arg _args[] = {
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{0, 1024, "invalid number of priority groups"},
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{0, 1024, "invalid initial priority group number"},
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};
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int r;
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struct multipath *m;
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struct arg_set as;
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struct dm_arg_set as;
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unsigned pg_count = 0;
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unsigned next_pg_num;
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@@ -876,11 +812,11 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
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if (r)
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goto bad;
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r = read_param(_params, shift(&as), &m->nr_priority_groups, &ti->error);
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r = dm_read_arg(_args, &as, &m->nr_priority_groups, &ti->error);
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if (r)
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goto bad;
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r = read_param(_params + 1, shift(&as), &next_pg_num, &ti->error);
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r = dm_read_arg(_args + 1, &as, &next_pg_num, &ti->error);
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if (r)
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goto bad;
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@@ -1510,10 +1446,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
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}
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if (argc == 1) {
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if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
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if (!strcasecmp(argv[0], "queue_if_no_path")) {
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r = queue_if_no_path(m, 1, 0);
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goto out;
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} else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) {
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} else if (!strcasecmp(argv[0], "fail_if_no_path")) {
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r = queue_if_no_path(m, 0, 0);
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goto out;
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}
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@@ -1524,18 +1460,18 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
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goto out;
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}
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if (!strnicmp(argv[0], MESG_STR("disable_group"))) {
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if (!strcasecmp(argv[0], "disable_group")) {
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r = bypass_pg_num(m, argv[1], 1);
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goto out;
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} else if (!strnicmp(argv[0], MESG_STR("enable_group"))) {
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} else if (!strcasecmp(argv[0], "enable_group")) {
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r = bypass_pg_num(m, argv[1], 0);
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goto out;
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} else if (!strnicmp(argv[0], MESG_STR("switch_group"))) {
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} else if (!strcasecmp(argv[0], "switch_group")) {
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r = switch_pg_num(m, argv[1]);
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goto out;
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} else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
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} else if (!strcasecmp(argv[0], "reinstate_path"))
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action = reinstate_path;
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else if (!strnicmp(argv[0], MESG_STR("fail_path")))
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else if (!strcasecmp(argv[0], "fail_path"))
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action = fail_path;
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else {
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DMWARN("Unrecognised multipath message received.");
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