Re: [PATCH v3] f2fs: rebuild nat_bits during umount

From: Chao Yu
Date: Wed Feb 27 2019 - 22:49:21 EST

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Ping,

Could you please try this new version?

On 2019/2/17 6:26, Chao Yu wrote:
> From: Chao Yu <yuchao0@xxxxxxxxxx>
>
> If all free_nat_bitmap are available, we can rebuild nat_bits from
> free_nat_bitmap entirely during umount, let's make another chance
> to reenable nat_bits for image.
>
> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
> ---
> v3:
> - fix to remove nat journal during umount.
> fs/f2fs/checkpoint.c | 23 +++++++++----
> fs/f2fs/f2fs.h | 29 ++--------------
> fs/f2fs/node.c | 82 +++++++++++++++++++++++++++++++++++++-------
> 3 files changed, 89 insertions(+), 45 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 10a3ada28715..b4c9de4e6eb0 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1225,12 +1225,22 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
> struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
> unsigned long flags;
>
> - spin_lock_irqsave(&sbi->cp_lock, flags);
> + if (cpc->reason & CP_UMOUNT) {
> + if (le32_to_cpu(ckpt->cp_pack_total_block_count) >
> + sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks) {
> + clear_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
> + f2fs_msg(sbi->sb, KERN_NOTICE,
> + "Disable nat_bits due to no space");
> + } else if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG) &&
> + f2fs_nat_bitmap_enabled(sbi)) {
> + f2fs_enable_nat_bits(sbi);
> + set_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
> + f2fs_msg(sbi->sb, KERN_NOTICE,
> + "Rebuild and enable nat_bits");
> + }
> + }
>
> - if ((cpc->reason & CP_UMOUNT) &&
> - le32_to_cpu(ckpt->cp_pack_total_block_count) >
> - sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
> - disable_nat_bits(sbi, false);
> + spin_lock_irqsave(&sbi->cp_lock, flags);
>
> if (cpc->reason & CP_TRIMMED)
> __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
> @@ -1395,7 +1405,8 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
> start_blk = __start_cp_next_addr(sbi);
>
> /* write nat bits */
> - if (enabled_nat_bits(sbi, cpc)) {
> + if ((cpc->reason & CP_UMOUNT) &&
> + is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG)) {
> __u64 cp_ver = cur_cp_version(ckpt);
> block_t blk;
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index c0d30810ef8a..a543354fc6bf 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1615,33 +1615,6 @@ static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
> spin_unlock_irqrestore(&sbi->cp_lock, flags);
> }
>
> -static inline void disable_nat_bits(struct f2fs_sb_info *sbi, bool lock)
> -{
> - unsigned long flags;
> -
> - /*
> - * In order to re-enable nat_bits we need to call fsck.f2fs by
> - * set_sbi_flag(sbi, SBI_NEED_FSCK). But it may give huge cost,
> - * so let's rely on regular fsck or unclean shutdown.
> - */
> -
> - if (lock)
> - spin_lock_irqsave(&sbi->cp_lock, flags);
> - __clear_ckpt_flags(F2FS_CKPT(sbi), CP_NAT_BITS_FLAG);
> - kvfree(NM_I(sbi)->nat_bits);
> - NM_I(sbi)->nat_bits = NULL;
> - if (lock)
> - spin_unlock_irqrestore(&sbi->cp_lock, flags);
> -}
> -
> -static inline bool enabled_nat_bits(struct f2fs_sb_info *sbi,
> - struct cp_control *cpc)
> -{
> - bool set = is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
> -
> - return (cpc) ? (cpc->reason & CP_UMOUNT) && set : set;
> -}
> -
> static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)
> {
> down_read(&sbi->cp_rwsem);
> @@ -2970,6 +2943,7 @@ int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from);
> int f2fs_truncate_xattr_node(struct inode *inode);
> int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi,
> unsigned int seq_id);
> +bool f2fs_nat_bitmap_enabled(struct f2fs_sb_info *sbi);
> int f2fs_remove_inode_page(struct inode *inode);
> struct page *f2fs_new_inode_page(struct inode *inode);
> struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs);
> @@ -2993,6 +2967,7 @@ int f2fs_recover_xattr_data(struct inode *inode, struct page *page);
> int f2fs_recover_inode_page(struct f2fs_sb_info *sbi, struct page *page);
> int f2fs_restore_node_summary(struct f2fs_sb_info *sbi,
> unsigned int segno, struct f2fs_summary_block *sum);
> +void f2fs_enable_nat_bits(struct f2fs_sb_info *sbi);
> int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc);
> int f2fs_build_node_manager(struct f2fs_sb_info *sbi);
> void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi);
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index f6ff84e29749..e364c6a84f3c 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -2038,6 +2038,24 @@ static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
> }
> }
>
> +bool f2fs_nat_bitmap_enabled(struct f2fs_sb_info *sbi)
> +{
> + struct f2fs_nm_info *nm_i = NM_I(sbi);
> + unsigned int i;
> + bool ret = true;
> +
> + down_read(&nm_i->nat_tree_lock);
> + for (i = 0; i < nm_i->nat_blocks; i++) {
> + if (!test_bit_le(i, nm_i->nat_block_bitmap)) {
> + ret = false;
> + break;
> + }
> + }
> + up_read(&nm_i->nat_tree_lock);
> +
> + return ret;
> +}
> +
> static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid,
> bool set, bool build)
> {
> @@ -2698,7 +2716,7 @@ static void __update_nat_bits(struct f2fs_sb_info *sbi, nid_t start_nid,
> int valid = 0;
> int i = 0;
>
> - if (!enabled_nat_bits(sbi, NULL))
> + if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG))
> return;
>
> if (nat_index == 0) {
> @@ -2722,6 +2740,43 @@ static void __update_nat_bits(struct f2fs_sb_info *sbi, nid_t start_nid,
> __clear_bit_le(nat_index, nm_i->full_nat_bits);
> }
>
> +void f2fs_enable_nat_bits(struct f2fs_sb_info *sbi)
> +{
> + struct f2fs_nm_info *nm_i = NM_I(sbi);
> + int nat_ofs;
> +
> + down_read(&nm_i->nat_tree_lock);
> +
> + for (nat_ofs = 0; nat_ofs < nm_i->nat_blocks; nat_ofs++) {
> + int valid = 0, nid_ofs = 0;
> +
> + if (nat_ofs == 0) {
> + valid = 1;
> + nid_ofs = 1;
> + }
> +
> + for (; nid_ofs < NAT_ENTRY_PER_BLOCK; nid_ofs++) {
> + if (!test_bit_le(nid_ofs,
> + nm_i->free_nid_bitmap[nat_ofs]))
> + valid++;
> + }
> +
> + if (valid == 0) {
> + __set_bit_le(nat_ofs, nm_i->empty_nat_bits);
> + __clear_bit_le(nat_ofs, nm_i->full_nat_bits);
> + continue;
> + }
> +
> + __clear_bit_le(nat_ofs, nm_i->empty_nat_bits);
> + if (valid == NAT_ENTRY_PER_BLOCK)
> + __set_bit_le(nat_ofs, nm_i->full_nat_bits);
> + else
> + __clear_bit_le(nat_ofs, nm_i->full_nat_bits);
> + }
> +
> + up_read(&nm_i->nat_tree_lock);
> +}
> +
> static int __flush_nat_entry_set(struct f2fs_sb_info *sbi,
> struct nat_entry_set *set, struct cp_control *cpc)
> {
> @@ -2738,7 +2793,7 @@ static int __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 (enabled_nat_bits(sbi, cpc) ||
> + if ((cpc->reason & CP_UMOUNT) ||
> !__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL))
> to_journal = false;
>
> @@ -2813,7 +2868,7 @@ int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
> int err = 0;
>
> /* during unmount, let's flush nat_bits before checking dirty_nat_cnt */
> - if (enabled_nat_bits(sbi, cpc)) {
> + if (cpc->reason & CP_UMOUNT) {
> down_write(&nm_i->nat_tree_lock);
> remove_nats_in_journal(sbi);
> up_write(&nm_i->nat_tree_lock);
> @@ -2829,7 +2884,7 @@ int f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
> * entries, remove all entries from journal and merge them
> * into nat entry set.
> */
> - if (enabled_nat_bits(sbi, cpc) ||
> + if ((cpc->reason & CP_UMOUNT) ||
> !__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
> remove_nats_in_journal(sbi);
>
> @@ -2864,15 +2919,18 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
> __u64 cp_ver = cur_cp_version(ckpt);
> block_t nat_bits_addr;
>
> - if (!enabled_nat_bits(sbi, NULL))
> - return 0;
> -
> nm_i->nat_bits_blocks = F2FS_BLK_ALIGN((nat_bits_bytes << 1) + 8);
> nm_i->nat_bits = f2fs_kzalloc(sbi,
> nm_i->nat_bits_blocks << F2FS_BLKSIZE_BITS, GFP_KERNEL);
> if (!nm_i->nat_bits)
> return -ENOMEM;
>
> + nm_i->full_nat_bits = nm_i->nat_bits + 8;
> + nm_i->empty_nat_bits = nm_i->full_nat_bits + nat_bits_bytes;
> +
> + if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG))
> + return 0;
> +
> 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++) {
> @@ -2889,13 +2947,13 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
>
> cp_ver |= (cur_cp_crc(ckpt) << 32);
> if (cpu_to_le64(cp_ver) != *(__le64 *)nm_i->nat_bits) {
> - disable_nat_bits(sbi, true);
> + clear_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
> + f2fs_msg(sbi->sb, KERN_NOTICE,
> + "Disable nat_bits due to incorrect cp_ver (%llu, %llu)",
> + cp_ver, le64_to_cpu(*(__le64 *)nm_i->nat_bits));
> 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;
> }
> @@ -2906,7 +2964,7 @@ static inline void load_free_nid_bitmap(struct f2fs_sb_info *sbi)
> unsigned int i = 0;
> nid_t nid, last_nid;
>
> - if (!enabled_nat_bits(sbi, NULL))
> + if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG))
> return;
>
> for (i = 0; i < nm_i->nat_blocks; i++) {
>

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