From 498f0103ea13123e007660def9072a0b7dd1c599 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 2 Aug 2011 12:32:04 +0100 Subject: 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 Signed-off-by: Alasdair G Kergon --- drivers/md/dm-mpath.c | 152 +++++++++++++++----------------------------------- 1 file changed, 44 insertions(+), 108 deletions(-) (limited to 'drivers/md/dm-mpath.c') diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index adf851a..5e0090e 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -22,7 +22,6 @@ #include #define DM_MSG_PREFIX "multipath" -#define MESG_STR(x) x, sizeof(x) #define DM_PG_INIT_DELAY_MSECS 2000 #define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1) @@ -505,80 +504,29 @@ static void trigger_event(struct work_struct *work) * <#paths> <#per-path selector args> * [ []* ]+ ]+ *---------------------------------------------------------------*/ -struct param { - unsigned min; - unsigned max; - char *error; -}; - -static int read_param(struct param *param, char *str, unsigned *v, char **error) -{ - if (!str || - (sscanf(str, "%u", v) != 1) || - (*v < param->min) || - (*v > param->max)) { - *error = param->error; - return -EINVAL; - } - - return 0; -} - -struct arg_set { - unsigned argc; - char **argv; -}; - -static char *shift(struct arg_set *as) -{ - char *r; - - if (as->argc) { - as->argc--; - r = *as->argv; - as->argv++; - return r; - } - - return NULL; -} - -static void consume(struct arg_set *as, unsigned n) -{ - BUG_ON (as->argc < n); - as->argc -= n; - as->argv += n; -} - -static int parse_path_selector(struct arg_set *as, struct priority_group *pg, +static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg, struct dm_target *ti) { int r; struct path_selector_type *pst; unsigned ps_argc; - static struct param _params[] = { + static struct dm_arg _args[] = { {0, 1024, "invalid number of path selector args"}, }; - pst = dm_get_path_selector(shift(as)); + pst = dm_get_path_selector(dm_shift_arg(as)); if (!pst) { ti->error = "unknown path selector type"; return -EINVAL; } - r = read_param(_params, shift(as), &ps_argc, &ti->error); + r = dm_read_arg_group(_args, as, &ps_argc, &ti->error); if (r) { dm_put_path_selector(pst); return -EINVAL; } - if (ps_argc > as->argc) { - dm_put_path_selector(pst); - ti->error = "not enough arguments for path selector"; - return -EINVAL; - } - r = pst->create(&pg->ps, ps_argc, as->argv); if (r) { dm_put_path_selector(pst); @@ -587,12 +535,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg, } pg->ps.type = pst; - consume(as, ps_argc); + dm_consume_args(as, ps_argc); return 0; } -static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps, +static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps, struct dm_target *ti) { int r; @@ -609,7 +557,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps, if (!p) return ERR_PTR(-ENOMEM); - r = dm_get_device(ti, shift(as), dm_table_get_mode(ti->table), + r = dm_get_device(ti, dm_shift_arg(as), dm_table_get_mode(ti->table), &p->path.dev); if (r) { ti->error = "error getting device"; @@ -660,16 +608,16 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps, return ERR_PTR(r); } -static struct priority_group *parse_priority_group(struct arg_set *as, +static struct priority_group *parse_priority_group(struct dm_arg_set *as, struct multipath *m) { - static struct param _params[] = { + static struct dm_arg _args[] = { {1, 1024, "invalid number of paths"}, {0, 1024, "invalid number of selector args"} }; int r; - unsigned i, nr_selector_args, nr_params; + unsigned i, nr_selector_args, nr_args; struct priority_group *pg; struct dm_target *ti = m->ti; @@ -693,26 +641,26 @@ static struct priority_group *parse_priority_group(struct arg_set *as, /* * read the paths */ - r = read_param(_params, shift(as), &pg->nr_pgpaths, &ti->error); + r = dm_read_arg(_args, as, &pg->nr_pgpaths, &ti->error); if (r) goto bad; - r = read_param(_params + 1, shift(as), &nr_selector_args, &ti->error); + r = dm_read_arg(_args + 1, as, &nr_selector_args, &ti->error); if (r) goto bad; - nr_params = 1 + nr_selector_args; + nr_args = 1 + nr_selector_args; for (i = 0; i < pg->nr_pgpaths; i++) { struct pgpath *pgpath; - struct arg_set path_args; + struct dm_arg_set path_args; - if (as->argc < nr_params) { + if (as->argc < nr_args) { ti->error = "not enough path parameters"; r = -EINVAL; goto bad; } - path_args.argc = nr_params; + path_args.argc = nr_args; path_args.argv = as->argv; pgpath = parse_path(&path_args, &pg->ps, ti); @@ -723,7 +671,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as, pgpath->pg = pg; list_add_tail(&pgpath->list, &pg->pgpaths); - consume(as, nr_params); + dm_consume_args(as, nr_args); } return pg; @@ -733,28 +681,23 @@ static struct priority_group *parse_priority_group(struct arg_set *as, return ERR_PTR(r); } -static int parse_hw_handler(struct arg_set *as, struct multipath *m) +static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m) { unsigned hw_argc; int ret; struct dm_target *ti = m->ti; - static struct param _params[] = { + static struct dm_arg _args[] = { {0, 1024, "invalid number of hardware handler args"}, }; - if (read_param(_params, shift(as), &hw_argc, &ti->error)) + if (dm_read_arg_group(_args, as, &hw_argc, &ti->error)) return -EINVAL; if (!hw_argc) return 0; - if (hw_argc > as->argc) { - ti->error = "not enough arguments for hardware handler"; - return -EINVAL; - } - - m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL); + m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL); request_module("scsi_dh_%s", m->hw_handler_name); if (scsi_dh_handler_exist(m->hw_handler_name) == 0) { ti->error = "unknown hardware handler type"; @@ -778,7 +721,7 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m) for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1) j = sprintf(p, "%s", as->argv[i]); } - consume(as, hw_argc - 1); + dm_consume_args(as, hw_argc - 1); return 0; fail: @@ -787,52 +730,45 @@ fail: return ret; } -static int parse_features(struct arg_set *as, struct multipath *m) +static int parse_features(struct dm_arg_set *as, struct multipath *m) { int r; unsigned argc; struct dm_target *ti = m->ti; - const char *param_name; + const char *arg_name; - static struct param _params[] = { + static struct dm_arg _args[] = { {0, 5, "invalid number of feature args"}, {1, 50, "pg_init_retries must be between 1 and 50"}, {0, 60000, "pg_init_delay_msecs must be between 0 and 60000"}, }; - r = read_param(_params, shift(as), &argc, &ti->error); + r = dm_read_arg_group(_args, as, &argc, &ti->error); if (r) return -EINVAL; if (!argc) return 0; - if (argc > as->argc) { - ti->error = "not enough arguments for features"; - return -EINVAL; - } - do { - param_name = shift(as); + arg_name = dm_shift_arg(as); argc--; - if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) { + if (!strcasecmp(arg_name, "queue_if_no_path")) { r = queue_if_no_path(m, 1, 0); continue; } - if (!strnicmp(param_name, MESG_STR("pg_init_retries")) && + if (!strcasecmp(arg_name, "pg_init_retries") && (argc >= 1)) { - r = read_param(_params + 1, shift(as), - &m->pg_init_retries, &ti->error); + r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error); argc--; continue; } - if (!strnicmp(param_name, MESG_STR("pg_init_delay_msecs")) && + if (!strcasecmp(arg_name, "pg_init_delay_msecs") && (argc >= 1)) { - r = read_param(_params + 2, shift(as), - &m->pg_init_delay_msecs, &ti->error); + r = dm_read_arg(_args + 2, as, &m->pg_init_delay_msecs, &ti->error); argc--; continue; } @@ -847,15 +783,15 @@ static int parse_features(struct arg_set *as, struct multipath *m) static int multipath_ctr(struct dm_target *ti, unsigned int argc, char **argv) { - /* target parameters */ - static struct param _params[] = { + /* target arguments */ + static struct dm_arg _args[] = { {0, 1024, "invalid number of priority groups"}, {0, 1024, "invalid initial priority group number"}, }; int r; struct multipath *m; - struct arg_set as; + struct dm_arg_set as; unsigned pg_count = 0; unsigned next_pg_num; @@ -876,11 +812,11 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc, if (r) goto bad; - r = read_param(_params, shift(&as), &m->nr_priority_groups, &ti->error); + r = dm_read_arg(_args, &as, &m->nr_priority_groups, &ti->error); if (r) goto bad; - r = read_param(_params + 1, shift(&as), &next_pg_num, &ti->error); + r = dm_read_arg(_args + 1, &as, &next_pg_num, &ti->error); if (r) goto bad; @@ -1510,10 +1446,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv) } if (argc == 1) { - if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) { + if (!strcasecmp(argv[0], "queue_if_no_path")) { r = queue_if_no_path(m, 1, 0); goto out; - } else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) { + } else if (!strcasecmp(argv[0], "fail_if_no_path")) { r = queue_if_no_path(m, 0, 0); goto out; } @@ -1524,18 +1460,18 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv) goto out; } - if (!strnicmp(argv[0], MESG_STR("disable_group"))) { + if (!strcasecmp(argv[0], "disable_group")) { r = bypass_pg_num(m, argv[1], 1); goto out; - } else if (!strnicmp(argv[0], MESG_STR("enable_group"))) { + } else if (!strcasecmp(argv[0], "enable_group")) { r = bypass_pg_num(m, argv[1], 0); goto out; - } else if (!strnicmp(argv[0], MESG_STR("switch_group"))) { + } else if (!strcasecmp(argv[0], "switch_group")) { r = switch_pg_num(m, argv[1]); goto out; - } else if (!strnicmp(argv[0], MESG_STR("reinstate_path"))) + } else if (!strcasecmp(argv[0], "reinstate_path")) action = reinstate_path; - else if (!strnicmp(argv[0], MESG_STR("fail_path"))) + else if (!strcasecmp(argv[0], "fail_path")) action = fail_path; else { DMWARN("Unrecognised multipath message received."); -- cgit v1.1