Re: [PATCH v2] f2fs: rebuild nat_bits during umount
From: Chao Yu
Date: Mon Dec 24 2018 - 01:53:54 EST
On 2018/12/13 16:50, Chao Yu wrote:
> 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.
Jaegeuk,
Could you please have a try with this patch?
I just did xfstest on it with below method, and there is no data corruption
reported from fsck:
- let fill_super preload all NAT blocks to enable free_nid_bitmap entirely.
- don't add nat_bits during mkfs image.
Thanks,
>
> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
> ---
> v2:
> - fix bugs in f2fs_enable_nat_bits()
> - add kmsg to record nat_bits {en,dis}abling operations
> - fix to validate {full,empty}_nat_bits in __get_nat_bitmaps()
>
> fs/f2fs/checkpoint.c | 20 +++++++++---
> fs/f2fs/f2fs.h | 21 ++-----------
> fs/f2fs/node.c | 72 +++++++++++++++++++++++++++++++++++++++-----
> 3 files changed, 82 insertions(+), 31 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 623536b8e0c0..fa0eb56f1703 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);
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 7cec897146a3..869a36b6a28f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1618,25 +1618,6 @@ 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);
> - kfree(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)
> {
> @@ -2952,6 +2933,7 @@ 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);
> @@ -2975,6 +2957,7 @@ 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 30a4427aaa94..9f55f2cb0dff 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -2036,6 +2036,24 @@ 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)
> {
> @@ -2720,6 +2738,43 @@ 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)
> {
> @@ -2862,15 +2917,18 @@ 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 (!enabled_nat_bits(sbi, NULL))
> + 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++) {
> @@ -2887,13 +2945,13 @@ 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;
> }
>