From be7d31cca8865c63087ce502a8b3dca4600c2a13 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 10 Feb 2016 13:02:21 -0500 Subject: [PATCH] dm mpath: switch from 'unsigned' to 'bool' for flags where appropriate Signed-off-by: Mike Snitzer --- drivers/md/dm-mpath.c | 101 +++++++++++++++++++++--------------------- 1 file changed, 51 insertions(+), 50 deletions(-) diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 09fb205a34a0..06911c8feaee 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -34,11 +34,12 @@ struct pgpath { struct list_head list; struct priority_group *pg; /* Owning PG */ - unsigned is_active; /* Path status */ unsigned fail_count; /* Cumulative failure count */ struct dm_path path; struct delayed_work activate_path; + + bool is_active:1; /* Path status */ }; #define path_to_pgpath(__pgp) container_of((__pgp), struct pgpath, path) @@ -54,10 +55,10 @@ struct priority_group { struct path_selector ps; unsigned pg_num; /* Reference number */ - unsigned bypassed; /* Temporarily bypass this PG? */ - unsigned nr_pgpaths; /* Number of paths in PG */ struct list_head pgpaths; + + bool bypassed:1; /* Temporarily bypass this PG? */ }; /* Multipath context */ @@ -75,20 +76,20 @@ struct multipath { wait_queue_head_t pg_init_wait; /* Wait for pg_init completion */ - unsigned pg_init_required; /* pg_init needs calling? */ unsigned pg_init_in_progress; /* Only one pg_init allowed at once */ - unsigned pg_init_delay_retry; /* Delay pg_init retry? */ unsigned nr_valid_paths; /* Total number of usable paths */ struct pgpath *current_pgpath; struct priority_group *current_pg; struct priority_group *next_pg; /* Switch to this PG if set */ - unsigned queue_io:1; /* Must we queue all I/O? */ - unsigned queue_if_no_path:1; /* Queue I/O if last path fails? */ - unsigned saved_queue_if_no_path:1; /* Saved state during suspension */ - unsigned retain_attached_hw_handler:1; /* If there's already a hw_handler present, don't change it. */ - unsigned pg_init_disabled:1; /* pg_init is not currently allowed */ + bool queue_io:1; /* Must we queue all I/O? */ + bool queue_if_no_path:1; /* Queue I/O if last path fails? */ + bool saved_queue_if_no_path:1; /* Saved state during suspension */ + bool retain_attached_hw_handler:1; /* If there's already a hw_handler present, don't change it. */ + bool pg_init_disabled:1; /* pg_init is not currently allowed */ + bool pg_init_required:1; /* pg_init needs calling? */ + bool pg_init_delay_retry:1; /* Delay pg_init retry? */ unsigned pg_init_retries; /* Number of times to retry pg_init */ unsigned pg_init_count; /* Number of times pg_init called */ @@ -132,7 +133,7 @@ static struct pgpath *alloc_pgpath(void) struct pgpath *pgpath = kzalloc(sizeof(*pgpath), GFP_KERNEL); if (pgpath) { - pgpath->is_active = 1; + pgpath->is_active = true; INIT_DELAYED_WORK(&pgpath->activate_path, activate_path); } @@ -189,7 +190,7 @@ static struct multipath *alloc_multipath(struct dm_target *ti, bool use_blk_mq) if (m) { INIT_LIST_HEAD(&m->priority_groups); spin_lock_init(&m->lock); - m->queue_io = 1; + m->queue_io = true; m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT; INIT_WORK(&m->trigger_event, trigger_event); init_waitqueue_head(&m->pg_init_wait); @@ -278,7 +279,7 @@ static int __pg_init_all_paths(struct multipath *m) return 0; m->pg_init_count++; - m->pg_init_required = 0; + m->pg_init_required = false; /* Check here to reset pg_init_required */ if (!m->current_pg) @@ -304,11 +305,11 @@ static void __switch_pg(struct multipath *m, struct pgpath *pgpath) /* Must we initialise the PG first, and queue I/O till it's ready? */ if (m->hw_handler_name) { - m->pg_init_required = 1; - m->queue_io = 1; + m->pg_init_required = true; + m->queue_io = true; } else { - m->pg_init_required = 0; - m->queue_io = 0; + m->pg_init_required = false; + m->queue_io = false; } m->pg_init_count = 0; @@ -334,10 +335,10 @@ static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg, static void __choose_pgpath(struct multipath *m, size_t nr_bytes) { struct priority_group *pg; - unsigned bypassed = 1; + bool bypassed = true; if (!m->nr_valid_paths) { - m->queue_io = 0; + m->queue_io = false; goto failed; } @@ -365,7 +366,7 @@ static void __choose_pgpath(struct multipath *m, size_t nr_bytes) continue; if (!__choose_path_in_pg(m, pg, nr_bytes)) { if (!bypassed) - m->pg_init_delay_retry = 1; + m->pg_init_delay_retry = true; return; } } @@ -496,8 +497,8 @@ static void multipath_release_clone(struct request *clone) /* * If we run out of usable paths, should we queue I/O or error it? */ -static int queue_if_no_path(struct multipath *m, unsigned queue_if_no_path, - unsigned save_old_value) +static int queue_if_no_path(struct multipath *m, bool queue_if_no_path, + bool save_old_value) { unsigned long flags; @@ -803,12 +804,12 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m) argc--; if (!strcasecmp(arg_name, "queue_if_no_path")) { - r = queue_if_no_path(m, 1, 0); + r = queue_if_no_path(m, true, false); continue; } if (!strcasecmp(arg_name, "retain_attached_hw_handler")) { - m->retain_attached_hw_handler = 1; + m->retain_attached_hw_handler = true; continue; } @@ -947,7 +948,7 @@ static void flush_multipath_work(struct multipath *m) unsigned long flags; spin_lock_irqsave(&m->lock, flags); - m->pg_init_disabled = 1; + m->pg_init_disabled = true; spin_unlock_irqrestore(&m->lock, flags); flush_workqueue(kmpath_handlerd); @@ -956,7 +957,7 @@ static void flush_multipath_work(struct multipath *m) flush_work(&m->trigger_event); spin_lock_irqsave(&m->lock, flags); - m->pg_init_disabled = 0; + m->pg_init_disabled = false; spin_unlock_irqrestore(&m->lock, flags); } @@ -984,7 +985,7 @@ static int fail_path(struct pgpath *pgpath) DMWARN("Failing path %s.", pgpath->path.dev->name); pgpath->pg->ps.type->fail_path(&pgpath->pg->ps, &pgpath->path); - pgpath->is_active = 0; + pgpath->is_active = false; pgpath->fail_count++; m->nr_valid_paths--; @@ -1028,7 +1029,7 @@ static int reinstate_path(struct pgpath *pgpath) if (r) goto out; - pgpath->is_active = 1; + pgpath->is_active = true; if (!m->nr_valid_paths++) { m->current_pgpath = NULL; @@ -1075,7 +1076,7 @@ static int action_dev(struct multipath *m, struct dm_dev *dev, * Temporarily try to avoid having to use the specified PG */ static void bypass_pg(struct multipath *m, struct priority_group *pg, - int bypassed) + bool bypassed) { unsigned long flags; @@ -1108,7 +1109,7 @@ static int switch_pg_num(struct multipath *m, const char *pgstr) spin_lock_irqsave(&m->lock, flags); list_for_each_entry(pg, &m->priority_groups, list) { - pg->bypassed = 0; + pg->bypassed = false; if (--pgnum) continue; @@ -1126,7 +1127,7 @@ static int switch_pg_num(struct multipath *m, const char *pgstr) * Set/clear bypassed status of a PG. * PGs are numbered upwards from 1 in the order they were declared. */ -static int bypass_pg_num(struct multipath *m, const char *pgstr, int bypassed) +static int bypass_pg_num(struct multipath *m, const char *pgstr, bool bypassed) { struct priority_group *pg; unsigned pgnum; @@ -1150,17 +1151,17 @@ static int bypass_pg_num(struct multipath *m, const char *pgstr, int bypassed) /* * Should we retry pg_init immediately? */ -static int pg_init_limit_reached(struct multipath *m, struct pgpath *pgpath) +static bool pg_init_limit_reached(struct multipath *m, struct pgpath *pgpath) { unsigned long flags; - int limit_reached = 0; + bool limit_reached = false; spin_lock_irqsave(&m->lock, flags); if (m->pg_init_count <= m->pg_init_retries && !m->pg_init_disabled) - m->pg_init_required = 1; + m->pg_init_required = true; else - limit_reached = 1; + limit_reached = true; spin_unlock_irqrestore(&m->lock, flags); @@ -1173,7 +1174,7 @@ static void pg_init_done(void *data, int errors) struct priority_group *pg = pgpath->pg; struct multipath *m = pg->m; unsigned long flags; - unsigned delay_retry = 0; + bool delay_retry = false; /* device or driver problems */ switch (errors) { @@ -1196,7 +1197,7 @@ static void pg_init_done(void *data, int errors) * Probably doing something like FW upgrade on the * controller so try the other pg. */ - bypass_pg(m, pg, 1); + bypass_pg(m, pg, true); break; case SCSI_DH_RETRY: /* Wait before retrying. */ @@ -1224,7 +1225,7 @@ static void pg_init_done(void *data, int errors) m->current_pg = NULL; } } else if (!m->pg_init_required) - pg->bypassed = 0; + pg->bypassed = false; if (--m->pg_init_in_progress) /* Activations of other paths are still on going */ @@ -1235,7 +1236,7 @@ static void pg_init_done(void *data, int errors) if (__pg_init_all_paths(m)) goto out; } - m->queue_io = 0; + m->queue_io = false; /* * Wake up any thread waiting to suspend. @@ -1350,7 +1351,7 @@ static void multipath_presuspend(struct dm_target *ti) { struct multipath *m = ti->private; - queue_if_no_path(m, 0, 1); + queue_if_no_path(m, false, true); } static void multipath_postsuspend(struct dm_target *ti) @@ -1516,10 +1517,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv) if (argc == 1) { if (!strcasecmp(argv[0], "queue_if_no_path")) { - r = queue_if_no_path(m, 1, 0); + r = queue_if_no_path(m, true, false); goto out; } else if (!strcasecmp(argv[0], "fail_if_no_path")) { - r = queue_if_no_path(m, 0, 0); + r = queue_if_no_path(m, false, false); goto out; } } @@ -1530,10 +1531,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv) } if (!strcasecmp(argv[0], "disable_group")) { - r = bypass_pg_num(m, argv[1], 1); + r = bypass_pg_num(m, argv[1], true); goto out; } else if (!strcasecmp(argv[0], "enable_group")) { - r = bypass_pg_num(m, argv[1], 0); + r = bypass_pg_num(m, argv[1], false); goto out; } else if (!strcasecmp(argv[0], "switch_group")) { r = switch_pg_num(m, argv[1]); @@ -1651,7 +1652,7 @@ static int __pgpath_busy(struct pgpath *pgpath) */ static int multipath_busy(struct dm_target *ti) { - int busy = 0, has_active = 0; + bool busy = false, has_active = false; struct multipath *m = ti->private; struct priority_group *pg; struct pgpath *pgpath; @@ -1662,7 +1663,7 @@ static int multipath_busy(struct dm_target *ti) /* pg_init in progress or no paths available */ if (m->pg_init_in_progress || (!m->nr_valid_paths && m->queue_if_no_path)) { - busy = 1; + busy = true; goto out; } /* Guess which priority_group will be used at next mapping time */ @@ -1684,13 +1685,13 @@ static int multipath_busy(struct dm_target *ti) * If there is one non-busy active path at least, the path selector * will be able to select it. So we consider such a pg as not busy. */ - busy = 1; + busy = true; list_for_each_entry(pgpath, &pg->pgpaths, list) if (pgpath->is_active) { - has_active = 1; + has_active = true; if (!__pgpath_busy(pgpath)) { - busy = 0; + busy = false; break; } } @@ -1701,7 +1702,7 @@ static int multipath_busy(struct dm_target *ti) * the current_pg will be changed at next mapping time. * We need to try mapping to determine it. */ - busy = 0; + busy = false; out: spin_unlock_irqrestore(&m->lock, flags); -- GitLab