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Date:   Thu, 16 Feb 2017 20:55:40 -0700
From:   Andreas Dilger <adilger@...ger.ca>
To:     Artem Blagodarenko <artem.blagodarenko@...il.com>
Cc:     linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
        darrick.wong@...cle.com, alexey.lyashkov@...il.com
Subject: Re: [PATCH v3 2/4] e2fsprogs: add support for 3-level htree


> On Feb 15, 2017, at 10:43 AM, Artem Blagodarenko <artem.blagodarenko@...il.com> wrote:
> 
> From: Artem Blagodarenko <artem.blagodarenko@...gate.com>
> 
> The INCOMPAT_LARGEDIR feature allows larger directories to
> be created, both with directory sizes over 2GB and and a
> maximum htree depth of 3 instead of the current limit of 2.
> These features are needed in order to exceed the currently
> limit of approximately 10M entries in a single directory
> for 4KB blocksize (~100k for 1KB).
> 
> debugfs, e2fsck, ext2fs, mke2fs and tune2fs support is
> added.
> 
> Signed-off-by: Alexey Lyashkov <alexey.lyashkov@...gate.com>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gate.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> e2fsck/pass1.c       |    5 +++--
> e2fsck/pass2.c       |    5 +++--
> lib/ext2fs/ext2_fs.h |    3 ++-
> lib/ext2fs/ext2fs.h  |   15 ++++++++++++++-
> misc/mke2fs.c        |    3 ++-
> misc/tune2fs.c       |    3 ++-
> 6 files changed, 26 insertions(+), 8 deletions(-)
> 
> diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
> index ce37176..11546d7 100644
> --- a/e2fsck/pass1.c
> +++ b/e2fsck/pass1.c
> @@ -1716,7 +1716,8 @@ void e2fsck_pass1(e2fsck_t ctx)
> 		}
> 
> 		if (inode->i_faddr || frag || fsize ||
> -		    (LINUX_S_ISDIR(inode->i_mode) && inode->i_size_high))
> +		    (!ext2fs_has_feature_largedir(fs->super) &&
> +		    (LINUX_S_ISDIR(inode->i_mode) && inode->i_size_high)))
> 			mark_inode_bad(ctx, ino);
> 		if ((fs->super->s_creator_os != EXT2_OS_HURD) &&
> 		    !ext2fs_has_feature_64bit(fs->super) &&
> @@ -2469,7 +2470,7 @@ static int handle_htree(e2fsck_t ctx, struct problem_context *pctx,
> 		return 1;
> 
> 	pctx->num = root->indirect_levels;
> -	if ((root->indirect_levels > 1) &&
> +	if ((root->indirect_levels > ext2_dir_htree_level(fs)) &&
> 	    fix_problem(ctx, PR_1_HTREE_DEPTH, pctx))
> 		return 1;
> 
> diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
> index b89ebc9..2f41fc4 100644
> --- a/e2fsck/pass2.c
> +++ b/e2fsck/pass2.c
> @@ -1058,7 +1058,8 @@ inline_read_fail:
> 			dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
> 			if ((root->reserved_zero ||
> 			     root->info_length < 8 ||
> -			     root->indirect_levels > 1) &&
> +			     root->indirect_levels >=
> +			     ext2_dir_htree_level(fs)) &&
> 			    fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
> 				clear_htree(ctx, ino);
> 				dx_dir->numblocks = 0;
> @@ -1811,7 +1812,7 @@ int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
> 		} else
> 			not_fixed++;
> 	}
> -	if (inode.i_size_high &&
> +	if (inode.i_size_high && !ext2fs_has_feature_largedir(fs->super) &&
> 	    LINUX_S_ISDIR(inode.i_mode)) {
> 		if (fix_problem(ctx, PR_2_DIR_SIZE_HIGH_ZERO, &pctx)) {
> 			inode.i_size_high = 0;
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 195e366..66b7058 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -921,7 +921,8 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		4, ENCRYPT)
> 
> #define EXT2_FEATURE_COMPAT_SUPP	0
> #define EXT2_FEATURE_INCOMPAT_SUPP    (EXT2_FEATURE_INCOMPAT_FILETYPE| \
> -				       EXT4_FEATURE_INCOMPAT_MMP)
> +				       EXT4_FEATURE_INCOMPAT_MMP| \
> +				       EXT4_FEATURE_INCOMPAT_LARGEDIR)
> #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
> 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
> 					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
> index 786ded8..c68be50 100644
> --- a/lib/ext2fs/ext2fs.h
> +++ b/lib/ext2fs/ext2fs.h
> @@ -588,7 +588,8 @@ typedef struct ext2_icount *ext2_icount_t;
> 					 EXT4_FEATURE_INCOMPAT_64BIT|\
> 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA|\
> 					 EXT4_FEATURE_INCOMPAT_ENCRYPT|\
> -					 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
> +					 EXT4_FEATURE_INCOMPAT_CSUM_SEED|\
> +					 EXT4_FEATURE_INCOMPAT_LARGEDIR)
> 
> #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
> 					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE|\
> @@ -1924,6 +1925,18 @@ _INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
> 	return (blk_t) ext2fs_inode_data_blocks2(fs, inode);
> }
> 
> +/* htree levels for ext4 */
> +#define EXT4_HTREE_LEVEL_COMPAT 2
> +#define EXT4_HTREE_LEVEL	3
> +
> +static inline unsigned int ext2_dir_htree_level(ext2_filsys fs)
> +{
> +	if (ext2fs_has_feature_largedir(fs->super))
> +		return EXT4_HTREE_LEVEL;
> +
> +	return EXT4_HTREE_LEVEL_COMPAT;
> +}
> +
> /*
>  * This is an efficient, overflow safe way of calculating ceil((1.0 * a) / b)
>  */
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index 9f18c83..b2bf461 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -1081,7 +1081,8 @@ static __u32 ok_features[3] = {
> 		EXT4_FEATURE_INCOMPAT_64BIT|
> 		EXT4_FEATURE_INCOMPAT_INLINE_DATA|
> 		EXT4_FEATURE_INCOMPAT_ENCRYPT |
> -		EXT4_FEATURE_INCOMPAT_CSUM_SEED,
> +		EXT4_FEATURE_INCOMPAT_CSUM_SEED |
> +		EXT4_FEATURE_INCOMPAT_LARGEDIR,
> 	/* R/O compat */
> 	EXT2_FEATURE_RO_COMPAT_LARGE_FILE|
> 		EXT4_FEATURE_RO_COMPAT_HUGE_FILE|
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index 6239577..f78d105 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -156,7 +156,8 @@ static __u32 ok_features[3] = {
> 		EXT4_FEATURE_INCOMPAT_MMP |
> 		EXT4_FEATURE_INCOMPAT_64BIT |
> 		EXT4_FEATURE_INCOMPAT_ENCRYPT |
> -		EXT4_FEATURE_INCOMPAT_CSUM_SEED,
> +		EXT4_FEATURE_INCOMPAT_CSUM_SEED |
> +		EXT4_FEATURE_INCOMPAT_LARGEDIR,
> 	/* R/O compat */
> 	EXT2_FEATURE_RO_COMPAT_LARGE_FILE |
> 		EXT4_FEATURE_RO_COMPAT_HUGE_FILE|
> --
> 1.7.1
> 


Cheers, Andreas






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