From 31e502298d80e2af9001d17dc419a3fd4b0bebef Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Wed, 21 Nov 2012 14:18:10 +0000 Subject: [PATCH] Btrfs: put raid properties into global table Raid properties can be shared among raid calculation code, we can put them into a global table to keep it simple. Signed-off-by: Liu Bo Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 1 + fs/btrfs/extent-tree.c | 6 +++--- fs/btrfs/volumes.c | 46 +++++++++++++++--------------------------- fs/btrfs/volumes.h | 9 +++++++++ 4 files changed, 29 insertions(+), 33 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index cd02205f13c..44d9bc87e86 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3077,6 +3077,7 @@ int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); int btrfs_init_space_info(struct btrfs_fs_info *fs_info); int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); +int __get_raid_index(u64 flags); /* ctree.c */ int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, int level, int *slot); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index e1528098918..b9526f74904 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5479,7 +5479,7 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache) return 0; } -static int __get_block_group_index(u64 flags) +int __get_raid_index(u64 flags) { int index; @@ -5499,7 +5499,7 @@ static int __get_block_group_index(u64 flags) static int get_block_group_index(struct btrfs_block_group_cache *cache) { - return __get_block_group_index(cache->flags); + return __get_raid_index(cache->flags); } enum btrfs_loop_type { @@ -7441,7 +7441,7 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) */ target = get_restripe_target(root->fs_info, block_group->flags); if (target) { - index = __get_block_group_index(extended_to_chunk(target)); + index = __get_raid_index(extended_to_chunk(target)); } else { /* * this is just a balance, so if we were marked as full diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index d79b5b620e9..5cce6aa7401 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3491,6 +3491,14 @@ static int btrfs_cmp_device_info(const void *a, const void *b) return 0; } +struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { + { 2, 1, 0, 4, 2, 2 /* raid10 */ }, + { 1, 1, 2, 2, 2, 2 /* raid1 */ }, + { 1, 2, 1, 1, 1, 2 /* dup */ }, + { 1, 1, 0, 2, 1, 1 /* raid0 */ }, + { 1, 1, 0, 1, 1, 1 /* single */ }, +}; + static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, struct map_lookup **map_ret, @@ -3520,43 +3528,21 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, int ndevs; int i; int j; + int index; BUG_ON(!alloc_profile_is_valid(type, 0)); if (list_empty(&fs_devices->alloc_list)) return -ENOSPC; - sub_stripes = 1; - dev_stripes = 1; - devs_increment = 1; - ncopies = 1; - devs_max = 0; /* 0 == as many as possible */ - devs_min = 1; + index = __get_raid_index(type); - /* - * define the properties of each RAID type. - * FIXME: move this to a global table and use it in all RAID - * calculation code - */ - if (type & (BTRFS_BLOCK_GROUP_DUP)) { - dev_stripes = 2; - ncopies = 2; - devs_max = 1; - } else if (type & (BTRFS_BLOCK_GROUP_RAID0)) { - devs_min = 2; - } else if (type & (BTRFS_BLOCK_GROUP_RAID1)) { - devs_increment = 2; - ncopies = 2; - devs_max = 2; - devs_min = 2; - } else if (type & (BTRFS_BLOCK_GROUP_RAID10)) { - sub_stripes = 2; - devs_increment = 2; - ncopies = 2; - devs_min = 4; - } else { - devs_max = 1; - } + sub_stripes = btrfs_raid_array[index].sub_stripes; + dev_stripes = btrfs_raid_array[index].dev_stripes; + devs_max = btrfs_raid_array[index].devs_max; + devs_min = btrfs_raid_array[index].devs_min; + devs_increment = btrfs_raid_array[index].devs_increment; + ncopies = btrfs_raid_array[index].ncopies; if (type & BTRFS_BLOCK_GROUP_DATA) { max_stripe_size = 1024 * 1024 * 1024; diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 37d0157167b..d3c3939ac75 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -180,6 +180,15 @@ struct btrfs_device_info { u64 total_avail; }; +struct btrfs_raid_attr { + int sub_stripes; /* sub_stripes info for map */ + int dev_stripes; /* stripes per dev */ + int devs_max; /* max devs to use */ + int devs_min; /* min devs needed */ + int devs_increment; /* ndevs has to be a multiple of this */ + int ncopies; /* how many copies to data has */ +}; + struct map_lookup { u64 type; int io_align;