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Date: Tue, 17 Apr 2018 23:12:28 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Wang Shilong <wangshilong1991@...il.com>
Cc: linux-ext4@...r.kernel.org, bo.liu@...ux.alibaba.com,
wshilong@....com, Shuichi Ihara <sihara@....com>, tytso@....edu
Subject: Re: [PATCH 2/4] ext4: new ext4_mark_group_bitmap_corrupted() helper
On Apr 17, 2018, at 6:08 PM, Wang Shilong <wangshilong1991@...il.com> wrote:
>
> From: Wang Shilong <wshilong@....com>
>
> Since there are many places to set inode/block bitmap
> corrupt bit, add a new helper for it, which will make
> codes more clear.
>
> Signed-off-by: Wang Shilong <wshilong@....com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> fs/ext4/balloc.c | 29 +++++++----------------------
> fs/ext4/ext4.h | 7 +++++++
> fs/ext4/ialloc.c | 20 ++++----------------
> fs/ext4/mballoc.c | 14 ++++----------
> fs/ext4/super.c | 30 ++++++++++++++++++++++++++++++
> 5 files changed, 52 insertions(+), 48 deletions(-)
>
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index a33d8fb1bf2a..0ac442aff7b8 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -185,25 +185,15 @@ static int ext4_init_block_bitmap(struct super_block *sb,
> struct ext4_sb_info *sbi = EXT4_SB(sb);
> ext4_fsblk_t start, tmp;
> int flex_bg = 0;
> - struct ext4_group_info *grp;
>
> J_ASSERT_BH(bh, buffer_locked(bh));
>
> /* If checksum is bad mark all blocks used to prevent allocation
> * essentially implementing a per-group read-only flag. */
> if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
> - grp = ext4_get_group_info(sb, block_group);
> - if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
> - percpu_counter_sub(&sbi->s_freeclusters_counter,
> - grp->bb_free);
> - set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
> - if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
> - int count;
> - count = ext4_free_inodes_count(sb, gdp);
> - percpu_counter_sub(&sbi->s_freeinodes_counter,
> - count);
> - }
> - set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, block_group,
> + EXT4_GROUP_INFO_BBITMAP_CORRUPT |
> + EXT4_GROUP_INFO_IBITMAP_CORRUPT);
> return -EFSBADCRC;
> }
> memset(bh->b_data, 0, sb->s_blocksize);
> @@ -374,7 +364,6 @@ static int ext4_validate_block_bitmap(struct super_block *sb,
> {
> ext4_fsblk_t blk;
> struct ext4_group_info *grp = ext4_get_group_info(sb, block_group);
> - struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> if (buffer_verified(bh))
> return 0;
> @@ -386,10 +375,8 @@ static int ext4_validate_block_bitmap(struct super_block *sb,
> desc, bh))) {
> ext4_unlock_group(sb, block_group);
> ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
> - if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
> - percpu_counter_sub(&sbi->s_freeclusters_counter,
> - grp->bb_free);
> - set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, block_group,
> + EXT4_GROUP_INFO_BBITMAP_CORRUPT);
> return -EFSBADCRC;
> }
> blk = ext4_valid_block_bitmap(sb, desc, block_group, bh);
> @@ -397,10 +384,8 @@ static int ext4_validate_block_bitmap(struct super_block *sb,
> ext4_unlock_group(sb, block_group);
> ext4_error(sb, "bg %u: block %llu: invalid block bitmap",
> block_group, blk);
> - if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
> - percpu_counter_sub(&sbi->s_freeclusters_counter,
> - grp->bb_free);
> - set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, block_group,
> + EXT4_GROUP_INFO_BBITMAP_CORRUPT);
> return -EFSCORRUPTED;
> }
> set_buffer_verified(bh);
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index a42e71203e53..fa52b7dd4542 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2530,6 +2530,9 @@ extern int ext4_alloc_flex_bg_array(struct super_block *sb,
> ext4_group_t ngroup);
> extern const char *ext4_decode_error(struct super_block *sb, int errno,
> char nbuf[16]);
> +extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
> + ext4_group_t block_group,
> + unsigned int flags);
>
> extern __printf(4, 5)
> void __ext4_error(struct super_block *, const char *, unsigned int,
> @@ -2857,6 +2860,10 @@ struct ext4_group_info {
> #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
> #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
> #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
> +#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
> + (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
> +#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
> + (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
>
> #define EXT4_MB_GRP_NEED_INIT(grp) \
> (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 33a2c98ce1ff..95611cf9f552 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -83,7 +83,6 @@ static int ext4_validate_inode_bitmap(struct super_block *sb,
> {
> ext4_fsblk_t blk;
> struct ext4_group_info *grp = ext4_get_group_info(sb, block_group);
> - struct ext4_sb_info *sbi = EXT4_SB(sb);
>
> if (buffer_verified(bh))
> return 0;
> @@ -97,14 +96,8 @@ static int ext4_validate_inode_bitmap(struct super_block *sb,
> ext4_unlock_group(sb, block_group);
> ext4_error(sb, "Corrupt inode bitmap - block_group = %u, "
> "inode_bitmap = %llu", block_group, blk);
> - grp = ext4_get_group_info(sb, block_group);
> - if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
> - int count;
> - count = ext4_free_inodes_count(sb, desc);
> - percpu_counter_sub(&sbi->s_freeinodes_counter,
> - count);
> - }
> - set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, block_group,
> + EXT4_GROUP_INFO_IBITMAP_CORRUPT);
> return -EFSBADCRC;
> }
> set_buffer_verified(bh);
> @@ -337,13 +330,8 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
> fatal = err;
> } else {
> ext4_error(sb, "bit already cleared for inode %lu", ino);
> - if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
> - int count;
> - count = ext4_free_inodes_count(sb, gdp);
> - percpu_counter_sub(&sbi->s_freeinodes_counter,
> - count);
> - }
> - set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, block_group,
> + EXT4_GROUP_INFO_IBITMAP_CORRUPT);
> }
>
> error_return:
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 769a62708b1c..bc2d1eb9fd5d 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -747,10 +747,8 @@ void ext4_mb_generate_buddy(struct super_block *sb,
> * corrupt and update bb_free using bitmap value
> */
> grp->bb_free = free;
> - if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
> - percpu_counter_sub(&sbi->s_freeclusters_counter,
> - grp->bb_free);
> - set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, group,
> + EXT4_GROUP_INFO_BBITMAP_CORRUPT);
> }
> mb_set_largest_free_order(sb, grp);
>
> @@ -1454,12 +1452,8 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
> "freeing already freed block "
> "(bit %u); block bitmap corrupt.",
> block);
> - if (!EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))
> - percpu_counter_sub(&sbi->s_freeclusters_counter,
> - e4b->bd_info->bb_free);
> - /* Mark the block group as corrupt. */
> - set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
> - &e4b->bd_info->bb_state);
> + ext4_mark_group_bitmap_corrupted(sb, e4b->bd_group,
> + EXT4_GROUP_INFO_BBITMAP_CORRUPT);
> mb_regenerate_buddy(e4b);
> goto done;
> }
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 185f7e61f4cf..f5e9a1af067a 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -763,6 +763,36 @@ __acquires(bitlock)
> return;
> }
>
> +void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
> + ext4_group_t group,
> + unsigned int flags)
> +{
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + struct ext4_group_info *grp = ext4_get_group_info(sb, group);
> + struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
> +
> + if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT &&
> + !EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) {
> + percpu_counter_sub(&sbi->s_freeclusters_counter,
> + grp->bb_free);
> + set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
> + &grp->bb_state);
> + }
> +
> + if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT &&
> + !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
> + if (gdp) {
> + int count;
> +
> + count = ext4_free_inodes_count(sb, gdp);
> + percpu_counter_sub(&sbi->s_freeinodes_counter,
> + count);
> + }
> + set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
> + &grp->bb_state);
> + }
> +}
> +
> void ext4_update_dynamic_rev(struct super_block *sb)
> {
> struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> --
> 2.14.3
>
Cheers, Andreas
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