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author | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-02-09 10:38:09 -0800 |
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committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-02-27 09:59:54 -0800 |
commit | 22ad0b6ab46683975c6da032f1c2593066c7b3bd (patch) | |
tree | e4868123c476d3a4ebcdec04b50263ae49acd80a /fs/f2fs/node.c | |
parent | 5e8256ac2e378089a1bf3fae87370811b1d31625 (diff) | |
download | linux-stable-22ad0b6ab46683975c6da032f1c2593066c7b3bd.tar.gz linux-stable-22ad0b6ab46683975c6da032f1c2593066c7b3bd.tar.bz2 linux-stable-22ad0b6ab46683975c6da032f1c2593066c7b3bd.zip |
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>
Diffstat (limited to 'fs/f2fs/node.c')
-rw-r--r-- | fs/f2fs/node.c | 188 |
1 files changed, 172 insertions, 16 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 8ebc4c78e6a4..43d35ec11851 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -338,6 +338,9 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni, set_nat_flag(e, IS_CHECKPOINTED, false); __set_nat_cache_dirty(nm_i, e); + if (enabled_nat_bits(sbi, NULL) && new_blkaddr == NEW_ADDR) + clear_bit_le(NAT_BLOCK_OFFSET(ni->nid), nm_i->empty_nat_bits); + /* update fsync_mark if its inode nat entry is still alive */ if (ni->nid != ni->ino) e = __lookup_nat_cache(nm_i, ni->ino); @@ -1841,7 +1844,60 @@ static void scan_nat_page(struct f2fs_sb_info *sbi, } } -static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync) +static int scan_nat_bits(struct f2fs_sb_info *sbi) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + struct page *page; + unsigned int i = 0; + nid_t target = FREE_NID_PAGES * NAT_ENTRY_PER_BLOCK; + nid_t nid; + + if (!enabled_nat_bits(sbi, NULL)) + return -EAGAIN; + + down_read(&nm_i->nat_tree_lock); +check_empty: + i = find_next_bit_le(nm_i->empty_nat_bits, nm_i->nat_blocks, i); + if (i >= nm_i->nat_blocks) { + i = 0; + goto check_partial; + } + + for (nid = i * NAT_ENTRY_PER_BLOCK; nid < (i + 1) * NAT_ENTRY_PER_BLOCK; + nid++) { + if (unlikely(nid >= nm_i->max_nid)) + break; + add_free_nid(sbi, nid, true); + } + + if (nm_i->nid_cnt[FREE_NID_LIST] >= target) + goto out; + i++; + goto check_empty; + +check_partial: + i = find_next_zero_bit_le(nm_i->full_nat_bits, nm_i->nat_blocks, i); + if (i >= nm_i->nat_blocks) { + disable_nat_bits(sbi, true); + up_read(&nm_i->nat_tree_lock); + return -EINVAL; + } + + nid = i * NAT_ENTRY_PER_BLOCK; + page = get_current_nat_page(sbi, nid); + scan_nat_page(sbi, page, nid); + f2fs_put_page(page, 1); + + if (nm_i->nid_cnt[FREE_NID_LIST] < target) { + i++; + goto check_partial; + } +out: + up_read(&nm_i->nat_tree_lock); + return 0; +} + +static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount) { struct f2fs_nm_info *nm_i = NM_I(sbi); struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA); @@ -1856,6 +1912,21 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync) if (!sync && !available_free_memory(sbi, FREE_NIDS)) return; + /* try to find free nids with nat_bits */ + if (!mount && !scan_nat_bits(sbi) && nm_i->nid_cnt[FREE_NID_LIST]) + return; + + /* find next valid candidate */ + if (enabled_nat_bits(sbi, NULL)) { + int idx = find_next_zero_bit_le(nm_i->full_nat_bits, + nm_i->nat_blocks, 0); + + if (idx >= nm_i->nat_blocks) + set_sbi_flag(sbi, SBI_NEED_FSCK); + else + nid = idx * NAT_ENTRY_PER_BLOCK; + } + /* readahead nat pages to be scanned */ ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES, META_NAT, true); @@ -1898,10 +1969,10 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync) nm_i->ra_nid_pages, META_NAT, false); } -void build_free_nids(struct f2fs_sb_info *sbi, bool sync) +void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount) { mutex_lock(&NM_I(sbi)->build_lock); - __build_free_nids(sbi, sync); + __build_free_nids(sbi, sync, mount); mutex_unlock(&NM_I(sbi)->build_lock); } @@ -1943,7 +2014,7 @@ retry: spin_unlock(&nm_i->nid_list_lock); /* Let's scan nat pages and its caches to get free nids */ - build_free_nids(sbi, true); + build_free_nids(sbi, true, false); goto retry; } @@ -2235,8 +2306,39 @@ add_out: list_add_tail(&nes->set_list, head); } +void __update_nat_bits(struct f2fs_sb_info *sbi, nid_t start_nid, + struct page *page) +{ + struct f2fs_nm_info *nm_i = NM_I(sbi); + unsigned int nat_index = start_nid / NAT_ENTRY_PER_BLOCK; + struct f2fs_nat_block *nat_blk = page_address(page); + int valid = 0; + int i; + + if (!enabled_nat_bits(sbi, NULL)) + return; + + for (i = 0; i < NAT_ENTRY_PER_BLOCK; i++) { + if (start_nid == 0 && i == 0) + valid++; + if (nat_blk->entries[i].block_addr) + valid++; + } + if (valid == 0) { + set_bit_le(nat_index, nm_i->empty_nat_bits); + clear_bit_le(nat_index, nm_i->full_nat_bits); + return; + } + + clear_bit_le(nat_index, nm_i->empty_nat_bits); + if (valid == NAT_ENTRY_PER_BLOCK) + set_bit_le(nat_index, nm_i->full_nat_bits); + else + clear_bit_le(nat_index, nm_i->full_nat_bits); +} + static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, - struct nat_entry_set *set) + struct nat_entry_set *set, struct cp_control *cpc) { struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA); struct f2fs_journal *journal = curseg->journal; @@ -2251,7 +2353,8 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, * #1, flush nat entries to journal in current hot data summary block. * #2, flush nat entries to nat page. */ - if (!__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL)) + if (enabled_nat_bits(sbi, cpc) || + !__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL)) to_journal = false; if (to_journal) { @@ -2291,10 +2394,12 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, } } - if (to_journal) + if (to_journal) { up_write(&curseg->journal_rwsem); - else + } else { + __update_nat_bits(sbi, start_nid, page); f2fs_put_page(page, 1); + } f2fs_bug_on(sbi, set->entry_cnt); @@ -2305,7 +2410,7 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, /* * This function is called during the checkpointing process. */ -void flush_nat_entries(struct f2fs_sb_info *sbi) +void flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc) { struct f2fs_nm_info *nm_i = NM_I(sbi); struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA); @@ -2326,7 +2431,8 @@ void flush_nat_entries(struct f2fs_sb_info *sbi) * entries, remove all entries from journal and merge them * into nat entry set. */ - if (!__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL)) + if (cpc->reason == CP_UMOUNT || + !__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL)) remove_nats_in_journal(sbi); while ((found = __gang_lookup_nat_set(nm_i, @@ -2340,27 +2446,72 @@ void flush_nat_entries(struct f2fs_sb_info *sbi) /* flush dirty nats in nat entry set */ list_for_each_entry_safe(set, tmp, &sets, set_list) - __flush_nat_entry_set(sbi, set); + __flush_nat_entry_set(sbi, set, cpc); up_write(&nm_i->nat_tree_lock); f2fs_bug_on(sbi, nm_i->dirty_nat_cnt); } +static int __get_nat_bitmaps(struct f2fs_sb_info *sbi) +{ + struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + struct f2fs_nm_info *nm_i = NM_I(sbi); + unsigned int nat_bits_bytes = nm_i->nat_blocks / BITS_PER_BYTE; + unsigned int i; + __u64 cp_ver = cur_cp_version(ckpt); + size_t crc_offset = le32_to_cpu(ckpt->checksum_offset); + __u64 crc = le32_to_cpu(*((__le32 *) + ((unsigned char *)ckpt + crc_offset))); + block_t nat_bits_addr; + + if (!enabled_nat_bits(sbi, NULL)) + return 0; + + nm_i->nat_bits_blocks = F2FS_BYTES_TO_BLK((nat_bits_bytes << 1) + 8 + + F2FS_BLKSIZE - 1); + nm_i->nat_bits = kzalloc(nm_i->nat_bits_blocks << F2FS_BLKSIZE_BITS, + GFP_KERNEL); + if (!nm_i->nat_bits) + return -ENOMEM; + + nat_bits_addr = __start_cp_addr(sbi) + sbi->blocks_per_seg - + nm_i->nat_bits_blocks; + for (i = 0; i < nm_i->nat_bits_blocks; i++) { + struct page *page = get_meta_page(sbi, nat_bits_addr++); + + memcpy(nm_i->nat_bits + (i << F2FS_BLKSIZE_BITS), + page_address(page), F2FS_BLKSIZE); + f2fs_put_page(page, 1); + } + + cp_ver |= (crc << 32); + if (cpu_to_le64(cp_ver) != *(__le64 *)nm_i->nat_bits) { + disable_nat_bits(sbi, true); + return 0; + } + + nm_i->full_nat_bits = nm_i->nat_bits + 8; + nm_i->empty_nat_bits = nm_i->full_nat_bits + nat_bits_bytes; + + 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 |