f2fs: add bitmaps for empty or full NAT blocks
This patches adds bitmaps to represent empty or full NAT blocks containing free nid entries. If we can find valid crc|cp_ver in the last block of checkpoint pack, we'll use these bitmaps when building free nids. In order to avoid checkpointing burden, up-to-date bitmaps will be flushed only during umount time. So, normally we can get this gain, but when power-cut happens, we rely on fsck.f2fs which recovers this bitmap again. After this patch, we build free nids from nid #0 at mount time to make more full NAT blocks, but in runtime, we check empty NAT blocks to load free nids without loading any NAT pages from disk. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
parent
5e8256ac2e
commit
22ad0b6ab4
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@ -1024,6 +1024,10 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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spin_lock(&sbi->cp_lock);
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if (cpc->reason == CP_UMOUNT && ckpt->cp_pack_total_block_count >
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sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
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disable_nat_bits(sbi, false);
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if (cpc->reason == CP_UMOUNT)
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__set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
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else
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@ -1136,6 +1140,28 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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start_blk = __start_cp_next_addr(sbi);
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/* write nat bits */
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if (enabled_nat_bits(sbi, cpc)) {
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__u64 cp_ver = cur_cp_version(ckpt);
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unsigned int i;
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block_t blk;
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cp_ver |= ((__u64)crc32 << 32);
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*(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
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blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
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for (i = 0; i < nm_i->nat_bits_blocks; i++)
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update_meta_page(sbi, nm_i->nat_bits +
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(i << F2FS_BLKSIZE_BITS), blk + i);
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/* Flush all the NAT BITS pages */
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while (get_pages(sbi, F2FS_DIRTY_META)) {
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sync_meta_pages(sbi, META, LONG_MAX);
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if (unlikely(f2fs_cp_error(sbi)))
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return -EIO;
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}
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}
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/* need to wait for end_io results */
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wait_on_all_pages_writeback(sbi);
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if (unlikely(f2fs_cp_error(sbi)))
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@ -1272,7 +1298,7 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
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/* write cached NAT/SIT entries to NAT/SIT area */
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flush_nat_entries(sbi);
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flush_nat_entries(sbi, cpc);
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flush_sit_entries(sbi, cpc);
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/* unlock all the fs_lock[] in do_checkpoint() */
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@ -193,6 +193,7 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
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/* build nm */
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si->base_mem += sizeof(struct f2fs_nm_info);
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si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
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si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS);
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get_cache:
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si->cache_mem = 0;
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@ -554,6 +554,7 @@ struct f2fs_nm_info {
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struct list_head nat_entries; /* cached nat entry list (clean) */
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unsigned int nat_cnt; /* the # of cached nat entries */
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unsigned int dirty_nat_cnt; /* total num of nat entries in set */
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unsigned int nat_blocks; /* # of nat blocks */
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/* free node ids management */
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struct radix_tree_root free_nid_root;/* root of the free_nid cache */
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@ -564,6 +565,11 @@ struct f2fs_nm_info {
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/* for checkpoint */
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char *nat_bitmap; /* NAT bitmap pointer */
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unsigned int nat_bits_blocks; /* # of nat bits blocks */
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unsigned char *nat_bits; /* NAT bits blocks */
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unsigned char *full_nat_bits; /* full NAT pages */
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unsigned char *empty_nat_bits; /* empty NAT pages */
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#ifdef CONFIG_F2FS_CHECK_FS
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char *nat_bitmap_mir; /* NAT bitmap mirror */
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#endif
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@ -1171,6 +1177,27 @@ static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
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spin_unlock(&sbi->cp_lock);
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}
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static inline void disable_nat_bits(struct f2fs_sb_info *sbi, bool lock)
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{
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set_sbi_flag(sbi, SBI_NEED_FSCK);
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if (lock)
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spin_lock(&sbi->cp_lock);
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__clear_ckpt_flags(F2FS_CKPT(sbi), CP_NAT_BITS_FLAG);
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kfree(NM_I(sbi)->nat_bits);
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NM_I(sbi)->nat_bits = NULL;
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if (lock)
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spin_unlock(&sbi->cp_lock);
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}
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static inline bool enabled_nat_bits(struct f2fs_sb_info *sbi,
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struct cp_control *cpc)
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{
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bool set = is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
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return (cpc) ? (cpc->reason == CP_UMOUNT) && set : set;
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}
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static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)
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{
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down_read(&sbi->cp_rwsem);
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@ -2131,7 +2158,7 @@ void move_node_page(struct page *node_page, int gc_type);
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int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
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struct writeback_control *wbc, bool atomic);
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int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc);
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void build_free_nids(struct f2fs_sb_info *sbi, bool sync);
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void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount);
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bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid);
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void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid);
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void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid);
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@ -2142,7 +2169,7 @@ int recover_xattr_data(struct inode *inode, struct page *page,
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int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page);
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int restore_node_summary(struct f2fs_sb_info *sbi,
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unsigned int segno, struct f2fs_summary_block *sum);
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void flush_nat_entries(struct f2fs_sb_info *sbi);
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void flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc);
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int build_node_manager(struct f2fs_sb_info *sbi);
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void destroy_node_manager(struct f2fs_sb_info *sbi);
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int __init create_node_manager_caches(void);
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188
fs/f2fs/node.c
188
fs/f2fs/node.c
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@ -338,6 +338,9 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
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set_nat_flag(e, IS_CHECKPOINTED, false);
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__set_nat_cache_dirty(nm_i, e);
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if (enabled_nat_bits(sbi, NULL) && new_blkaddr == NEW_ADDR)
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clear_bit_le(NAT_BLOCK_OFFSET(ni->nid), nm_i->empty_nat_bits);
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/* update fsync_mark if its inode nat entry is still alive */
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if (ni->nid != ni->ino)
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e = __lookup_nat_cache(nm_i, ni->ino);
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@ -1841,7 +1844,60 @@ static void scan_nat_page(struct f2fs_sb_info *sbi,
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}
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}
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static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync)
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static int scan_nat_bits(struct f2fs_sb_info *sbi)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct page *page;
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unsigned int i = 0;
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nid_t target = FREE_NID_PAGES * NAT_ENTRY_PER_BLOCK;
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nid_t nid;
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if (!enabled_nat_bits(sbi, NULL))
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return -EAGAIN;
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down_read(&nm_i->nat_tree_lock);
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check_empty:
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i = find_next_bit_le(nm_i->empty_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks) {
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i = 0;
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goto check_partial;
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}
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for (nid = i * NAT_ENTRY_PER_BLOCK; nid < (i + 1) * NAT_ENTRY_PER_BLOCK;
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nid++) {
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if (unlikely(nid >= nm_i->max_nid))
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break;
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add_free_nid(sbi, nid, true);
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}
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if (nm_i->nid_cnt[FREE_NID_LIST] >= target)
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goto out;
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i++;
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goto check_empty;
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check_partial:
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i = find_next_zero_bit_le(nm_i->full_nat_bits, nm_i->nat_blocks, i);
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if (i >= nm_i->nat_blocks) {
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disable_nat_bits(sbi, true);
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up_read(&nm_i->nat_tree_lock);
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return -EINVAL;
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}
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nid = i * NAT_ENTRY_PER_BLOCK;
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page = get_current_nat_page(sbi, nid);
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scan_nat_page(sbi, page, nid);
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f2fs_put_page(page, 1);
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if (nm_i->nid_cnt[FREE_NID_LIST] < target) {
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i++;
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goto check_partial;
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}
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out:
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up_read(&nm_i->nat_tree_lock);
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return 0;
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}
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static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
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@ -1856,6 +1912,21 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync)
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if (!sync && !available_free_memory(sbi, FREE_NIDS))
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return;
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/* try to find free nids with nat_bits */
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if (!mount && !scan_nat_bits(sbi) && nm_i->nid_cnt[FREE_NID_LIST])
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return;
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/* find next valid candidate */
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if (enabled_nat_bits(sbi, NULL)) {
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int idx = find_next_zero_bit_le(nm_i->full_nat_bits,
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nm_i->nat_blocks, 0);
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if (idx >= nm_i->nat_blocks)
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set_sbi_flag(sbi, SBI_NEED_FSCK);
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else
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nid = idx * NAT_ENTRY_PER_BLOCK;
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}
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/* readahead nat pages to be scanned */
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ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
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META_NAT, true);
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@ -1898,10 +1969,10 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync)
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nm_i->ra_nid_pages, META_NAT, false);
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}
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void build_free_nids(struct f2fs_sb_info *sbi, bool sync)
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void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
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{
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mutex_lock(&NM_I(sbi)->build_lock);
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__build_free_nids(sbi, sync);
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__build_free_nids(sbi, sync, mount);
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mutex_unlock(&NM_I(sbi)->build_lock);
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}
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@ -1943,7 +2014,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
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spin_unlock(&nm_i->nid_list_lock);
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/* Let's scan nat pages and its caches to get free nids */
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build_free_nids(sbi, true);
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build_free_nids(sbi, true, false);
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goto retry;
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}
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@ -2235,8 +2306,39 @@ static void __adjust_nat_entry_set(struct nat_entry_set *nes,
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list_add_tail(&nes->set_list, head);
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}
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void __update_nat_bits(struct f2fs_sb_info *sbi, nid_t start_nid,
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struct page *page)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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unsigned int nat_index = start_nid / NAT_ENTRY_PER_BLOCK;
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struct f2fs_nat_block *nat_blk = page_address(page);
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int valid = 0;
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int i;
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if (!enabled_nat_bits(sbi, NULL))
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return;
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for (i = 0; i < NAT_ENTRY_PER_BLOCK; i++) {
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if (start_nid == 0 && i == 0)
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valid++;
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if (nat_blk->entries[i].block_addr)
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valid++;
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}
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if (valid == 0) {
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set_bit_le(nat_index, nm_i->empty_nat_bits);
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clear_bit_le(nat_index, nm_i->full_nat_bits);
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return;
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}
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clear_bit_le(nat_index, nm_i->empty_nat_bits);
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if (valid == NAT_ENTRY_PER_BLOCK)
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set_bit_le(nat_index, nm_i->full_nat_bits);
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else
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clear_bit_le(nat_index, nm_i->full_nat_bits);
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}
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static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
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struct nat_entry_set *set)
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struct nat_entry_set *set, struct cp_control *cpc)
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{
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struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
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struct f2fs_journal *journal = curseg->journal;
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@ -2251,7 +2353,8 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
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* #1, flush nat entries to journal in current hot data summary block.
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* #2, flush nat entries to nat page.
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*/
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if (!__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL))
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if (enabled_nat_bits(sbi, cpc) ||
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!__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL))
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to_journal = false;
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if (to_journal) {
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@ -2291,10 +2394,12 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
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}
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}
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if (to_journal)
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if (to_journal) {
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up_write(&curseg->journal_rwsem);
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else
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} else {
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__update_nat_bits(sbi, start_nid, page);
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f2fs_put_page(page, 1);
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}
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f2fs_bug_on(sbi, set->entry_cnt);
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@ -2305,7 +2410,7 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
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/*
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* This function is called during the checkpointing process.
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*/
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void flush_nat_entries(struct f2fs_sb_info *sbi)
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void flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
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{
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
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@ -2326,7 +2431,8 @@ void flush_nat_entries(struct f2fs_sb_info *sbi)
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* entries, remove all entries from journal and merge them
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* into nat entry set.
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*/
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if (!__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
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if (cpc->reason == CP_UMOUNT ||
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!__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
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remove_nats_in_journal(sbi);
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while ((found = __gang_lookup_nat_set(nm_i,
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@ -2340,27 +2446,72 @@ void flush_nat_entries(struct f2fs_sb_info *sbi)
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/* flush dirty nats in nat entry set */
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list_for_each_entry_safe(set, tmp, &sets, set_list)
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__flush_nat_entry_set(sbi, set);
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__flush_nat_entry_set(sbi, set, cpc);
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up_write(&nm_i->nat_tree_lock);
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f2fs_bug_on(sbi, nm_i->dirty_nat_cnt);
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}
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static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
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{
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struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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unsigned int nat_bits_bytes = nm_i->nat_blocks / BITS_PER_BYTE;
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unsigned int i;
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__u64 cp_ver = cur_cp_version(ckpt);
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size_t crc_offset = le32_to_cpu(ckpt->checksum_offset);
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__u64 crc = le32_to_cpu(*((__le32 *)
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((unsigned char *)ckpt + crc_offset)));
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block_t nat_bits_addr;
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if (!enabled_nat_bits(sbi, NULL))
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return 0;
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nm_i->nat_bits_blocks = F2FS_BYTES_TO_BLK((nat_bits_bytes << 1) + 8 +
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F2FS_BLKSIZE - 1);
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nm_i->nat_bits = kzalloc(nm_i->nat_bits_blocks << F2FS_BLKSIZE_BITS,
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GFP_KERNEL);
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if (!nm_i->nat_bits)
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return -ENOMEM;
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nat_bits_addr = __start_cp_addr(sbi) + sbi->blocks_per_seg -
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nm_i->nat_bits_blocks;
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for (i = 0; i < nm_i->nat_bits_blocks; i++) {
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struct page *page = get_meta_page(sbi, nat_bits_addr++);
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memcpy(nm_i->nat_bits + (i << F2FS_BLKSIZE_BITS),
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page_address(page), F2FS_BLKSIZE);
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f2fs_put_page(page, 1);
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}
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cp_ver |= (crc << 32);
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if (cpu_to_le64(cp_ver) != *(__le64 *)nm_i->nat_bits) {
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disable_nat_bits(sbi, true);
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return 0;
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}
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nm_i->full_nat_bits = nm_i->nat_bits + 8;
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nm_i->empty_nat_bits = nm_i->full_nat_bits + nat_bits_bytes;
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f2fs_msg(sbi->sb, KERN_NOTICE, "Found nat_bits in checkpoint");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int init_node_manager(struct f2fs_sb_info *sbi)
|
||||
{
|
||||
struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
|
||||
struct f2fs_nm_info *nm_i = NM_I(sbi);
|
||||
unsigned char *version_bitmap;
|
||||
unsigned int nat_segs, nat_blocks;
|
||||
unsigned int nat_segs;
|
||||
int err;
|
||||
|
||||
nm_i->nat_blkaddr = le32_to_cpu(sb_raw->nat_blkaddr);
|
||||
|
||||
/* segment_count_nat includes pair segment so divide to 2. */
|
||||
nat_segs = le32_to_cpu(sb_raw->segment_count_nat) >> 1;
|
||||
nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
|
||||
|
||||
nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;
|
||||
nm_i->nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
|
||||
nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nm_i->nat_blocks;
|
||||
|
||||
/* not used nids: 0, node, meta, (and root counted as valid node) */
|
||||
nm_i->available_nids = nm_i->max_nid - sbi->total_valid_node_count -
|
||||
|
|
@ -2394,6 +2545,10 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
|
|||
if (!nm_i->nat_bitmap)
|
||||
return -ENOMEM;
|
||||
|
||||
err = __get_nat_bitmaps(sbi);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
#ifdef CONFIG_F2FS_CHECK_FS
|
||||
nm_i->nat_bitmap_mir = kmemdup(version_bitmap, nm_i->bitmap_size,
|
||||
GFP_KERNEL);
|
||||
|
|
@ -2416,7 +2571,7 @@ int build_node_manager(struct f2fs_sb_info *sbi)
|
|||
if (err)
|
||||
return err;
|
||||
|
||||
build_free_nids(sbi, true);
|
||||
build_free_nids(sbi, true, true);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2475,6 +2630,7 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
|
|||
up_write(&nm_i->nat_tree_lock);
|
||||
|
||||
kfree(nm_i->nat_bitmap);
|
||||
kfree(nm_i->nat_bits);
|
||||
#ifdef CONFIG_F2FS_CHECK_FS
|
||||
kfree(nm_i->nat_bitmap_mir);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -386,7 +386,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
|
|||
if (!available_free_memory(sbi, FREE_NIDS))
|
||||
try_to_free_nids(sbi, MAX_FREE_NIDS);
|
||||
else
|
||||
build_free_nids(sbi, false);
|
||||
build_free_nids(sbi, false, false);
|
||||
|
||||
if (!is_idle(sbi))
|
||||
return;
|
||||
|
|
|
|||
|
|
@ -114,6 +114,7 @@ struct f2fs_super_block {
|
|||
/*
|
||||
* For checkpoint
|
||||
*/
|
||||
#define CP_NAT_BITS_FLAG 0x00000080
|
||||
#define CP_CRC_RECOVERY_FLAG 0x00000040
|
||||
#define CP_FASTBOOT_FLAG 0x00000020
|
||||
#define CP_FSCK_FLAG 0x00000010
|
||||
|
|
|
|||
Loading…
Reference in New Issue