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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[PATCH] md: tidy up raid5/6 hash table code
- replace open-coded hash chain with hlist macros - Fix hash-table size at one page - it is already quite generous, so there will never be a need to use multiple pages, so no need for __get_free_pages No functional change. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
Linus Torvalds
parent
9ffae0cf3e
commit
fccddba060
@ -35,12 +35,10 @@
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#define STRIPE_SHIFT (PAGE_SHIFT - 9)
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#define STRIPE_SECTORS (STRIPE_SIZE>>9)
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#define IO_THRESHOLD 1
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#define HASH_PAGES 1
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#define HASH_PAGES_ORDER 0
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#define NR_HASH (HASH_PAGES * PAGE_SIZE / sizeof(struct stripe_head *))
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#define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head))
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#define HASH_MASK (NR_HASH - 1)
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#define stripe_hash(conf, sect) ((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])
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#define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK]))
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/* bio's attached to a stripe+device for I/O are linked together in bi_sector
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* order without overlap. There may be several bio's per stripe+device, and
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@ -113,29 +111,21 @@ static void release_stripe(struct stripe_head *sh)
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spin_unlock_irqrestore(&conf->device_lock, flags);
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}
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static void remove_hash(struct stripe_head *sh)
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static inline void remove_hash(struct stripe_head *sh)
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{
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PRINTK("remove_hash(), stripe %llu\n", (unsigned long long)sh->sector);
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if (sh->hash_pprev) {
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if (sh->hash_next)
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sh->hash_next->hash_pprev = sh->hash_pprev;
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*sh->hash_pprev = sh->hash_next;
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sh->hash_pprev = NULL;
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}
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hlist_del_init(&sh->hash);
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}
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static __inline__ void insert_hash(raid5_conf_t *conf, struct stripe_head *sh)
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static inline void insert_hash(raid5_conf_t *conf, struct stripe_head *sh)
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{
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struct stripe_head **shp = &stripe_hash(conf, sh->sector);
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struct hlist_head *hp = stripe_hash(conf, sh->sector);
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PRINTK("insert_hash(), stripe %llu\n", (unsigned long long)sh->sector);
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CHECK_DEVLOCK();
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if ((sh->hash_next = *shp) != NULL)
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(*shp)->hash_pprev = &sh->hash_next;
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*shp = sh;
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sh->hash_pprev = shp;
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hlist_add_head(&sh->hash, hp);
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}
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@ -228,10 +218,11 @@ static inline void init_stripe(struct stripe_head *sh, sector_t sector, int pd_i
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static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector)
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{
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struct stripe_head *sh;
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struct hlist_node *hn;
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CHECK_DEVLOCK();
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PRINTK("__find_stripe, sector %llu\n", (unsigned long long)sector);
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for (sh = stripe_hash(conf, sector); sh; sh = sh->hash_next)
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hlist_for_each_entry(sh, hn, stripe_hash(conf, sector), hash)
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if (sh->sector == sector)
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return sh;
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PRINTK("__stripe %llu not in cache\n", (unsigned long long)sector);
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@ -1835,9 +1826,8 @@ static int run(mddev_t *mddev)
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conf->mddev = mddev;
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if ((conf->stripe_hashtbl = (struct stripe_head **) __get_free_pages(GFP_ATOMIC, HASH_PAGES_ORDER)) == NULL)
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if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
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goto abort;
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memset(conf->stripe_hashtbl, 0, HASH_PAGES * PAGE_SIZE);
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spin_lock_init(&conf->device_lock);
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init_waitqueue_head(&conf->wait_for_stripe);
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@ -1972,9 +1962,7 @@ static int run(mddev_t *mddev)
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abort:
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if (conf) {
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print_raid5_conf(conf);
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if (conf->stripe_hashtbl)
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free_pages((unsigned long) conf->stripe_hashtbl,
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HASH_PAGES_ORDER);
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kfree(conf->stripe_hashtbl);
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kfree(conf);
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}
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mddev->private = NULL;
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@ -1991,7 +1979,7 @@ static int stop(mddev_t *mddev)
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md_unregister_thread(mddev->thread);
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mddev->thread = NULL;
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shrink_stripes(conf);
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free_pages((unsigned long) conf->stripe_hashtbl, HASH_PAGES_ORDER);
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kfree(conf->stripe_hashtbl);
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blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
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sysfs_remove_group(&mddev->kobj, &raid5_attrs_group);
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kfree(conf);
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@ -2019,12 +2007,12 @@ static void print_sh (struct stripe_head *sh)
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static void printall (raid5_conf_t *conf)
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{
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struct stripe_head *sh;
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struct hlist_node *hn;
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int i;
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spin_lock_irq(&conf->device_lock);
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for (i = 0; i < NR_HASH; i++) {
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sh = conf->stripe_hashtbl[i];
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for (; sh; sh = sh->hash_next) {
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hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) {
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if (sh->raid_conf != conf)
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continue;
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print_sh(sh);
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@ -40,12 +40,10 @@
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#define STRIPE_SHIFT (PAGE_SHIFT - 9)
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#define STRIPE_SECTORS (STRIPE_SIZE>>9)
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#define IO_THRESHOLD 1
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#define HASH_PAGES 1
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#define HASH_PAGES_ORDER 0
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#define NR_HASH (HASH_PAGES * PAGE_SIZE / sizeof(struct stripe_head *))
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#define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head))
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#define HASH_MASK (NR_HASH - 1)
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#define stripe_hash(conf, sect) ((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK])
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#define stripe_hash(conf, sect) (&((conf)->stripe_hashtbl[((sect) >> STRIPE_SHIFT) & HASH_MASK]))
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/* bio's attached to a stripe+device for I/O are linked together in bi_sector
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* order without overlap. There may be several bio's per stripe+device, and
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@ -132,29 +130,21 @@ static void release_stripe(struct stripe_head *sh)
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spin_unlock_irqrestore(&conf->device_lock, flags);
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}
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static void remove_hash(struct stripe_head *sh)
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static inline void remove_hash(struct stripe_head *sh)
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{
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PRINTK("remove_hash(), stripe %llu\n", (unsigned long long)sh->sector);
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if (sh->hash_pprev) {
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if (sh->hash_next)
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sh->hash_next->hash_pprev = sh->hash_pprev;
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*sh->hash_pprev = sh->hash_next;
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sh->hash_pprev = NULL;
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}
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hlist_del_init(&sh->hash);
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}
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static __inline__ void insert_hash(raid6_conf_t *conf, struct stripe_head *sh)
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static inline void insert_hash(raid6_conf_t *conf, struct stripe_head *sh)
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{
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struct stripe_head **shp = &stripe_hash(conf, sh->sector);
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struct hlist_head *hp = stripe_hash(conf, sh->sector);
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PRINTK("insert_hash(), stripe %llu\n", (unsigned long long)sh->sector);
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CHECK_DEVLOCK();
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if ((sh->hash_next = *shp) != NULL)
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(*shp)->hash_pprev = &sh->hash_next;
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*shp = sh;
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sh->hash_pprev = shp;
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hlist_add_head(&sh->hash, hp);
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}
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@ -247,10 +237,11 @@ static inline void init_stripe(struct stripe_head *sh, sector_t sector, int pd_i
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static struct stripe_head *__find_stripe(raid6_conf_t *conf, sector_t sector)
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{
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struct stripe_head *sh;
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struct hlist_node *hn;
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CHECK_DEVLOCK();
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PRINTK("__find_stripe, sector %llu\n", (unsigned long long)sector);
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for (sh = stripe_hash(conf, sector); sh; sh = sh->hash_next)
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hlist_for_each_entry (sh, hn, stripe_hash(conf, sector), hash)
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if (sh->sector == sector)
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return sh;
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PRINTK("__stripe %llu not in cache\n", (unsigned long long)sector);
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@ -1931,17 +1922,15 @@ static int run(mddev_t *mddev)
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return -EIO;
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}
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mddev->private = kmalloc (sizeof (raid6_conf_t)
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+ mddev->raid_disks * sizeof(struct disk_info),
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GFP_KERNEL);
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mddev->private = kzalloc(sizeof (raid6_conf_t)
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+ mddev->raid_disks * sizeof(struct disk_info),
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GFP_KERNEL);
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if ((conf = mddev->private) == NULL)
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goto abort;
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memset (conf, 0, sizeof (*conf) + mddev->raid_disks * sizeof(struct disk_info) );
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conf->mddev = mddev;
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if ((conf->stripe_hashtbl = (struct stripe_head **) __get_free_pages(GFP_ATOMIC, HASH_PAGES_ORDER)) == NULL)
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if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL)
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goto abort;
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memset(conf->stripe_hashtbl, 0, HASH_PAGES * PAGE_SIZE);
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conf->spare_page = alloc_page(GFP_KERNEL);
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if (!conf->spare_page)
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@ -2085,9 +2074,7 @@ static int run(mddev_t *mddev)
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print_raid6_conf(conf);
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if (conf->spare_page)
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put_page(conf->spare_page);
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if (conf->stripe_hashtbl)
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free_pages((unsigned long) conf->stripe_hashtbl,
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HASH_PAGES_ORDER);
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kfree(conf->stripe_hashtbl);
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kfree(conf);
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}
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mddev->private = NULL;
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@ -2104,7 +2091,7 @@ static int stop (mddev_t *mddev)
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md_unregister_thread(mddev->thread);
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mddev->thread = NULL;
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shrink_stripes(conf);
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free_pages((unsigned long) conf->stripe_hashtbl, HASH_PAGES_ORDER);
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kfree(conf->stripe_hashtbl);
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blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
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kfree(conf);
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mddev->private = NULL;
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@ -2131,12 +2118,13 @@ static void print_sh (struct seq_file *seq, struct stripe_head *sh)
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static void printall (struct seq_file *seq, raid6_conf_t *conf)
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{
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struct stripe_head *sh;
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struct hlist_node *hn;
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int i;
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spin_lock_irq(&conf->device_lock);
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for (i = 0; i < NR_HASH; i++) {
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sh = conf->stripe_hashtbl[i];
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for (; sh; sh = sh->hash_next) {
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hlist_for_each_entry(sh, hn, &conf->stripe_hashtbl[i], hash) {
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if (sh->raid_conf != conf)
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continue;
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print_sh(seq, sh);
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@ -126,7 +126,7 @@
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*/
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struct stripe_head {
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struct stripe_head *hash_next, **hash_pprev; /* hash pointers */
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struct hlist_node hash;
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struct list_head lru; /* inactive_list or handle_list */
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struct raid5_private_data *raid_conf;
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sector_t sector; /* sector of this row */
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@ -204,7 +204,7 @@ struct disk_info {
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};
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struct raid5_private_data {
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struct stripe_head **stripe_hashtbl;
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struct hlist_head *stripe_hashtbl;
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mddev_t *mddev;
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struct disk_info *spare;
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int chunk_size, level, algorithm;
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