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Date: Wed, 25 Jan 2017 09:33:05 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Artem Blagodarenko <artem.blagodarenko@...gate.com>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3 v2] e2fsprogs: add support for 3-level htree
On Wed, Jan 25, 2017 at 08:20:42PM +0300, Artem Blagodarenko wrote:
> Hello,
>
> Darrick J. Wong, thank you for inspection. Here is second version of the patch.
>
> Changes since v1
> * Part that removes dir_acl moved to separate patch "e2fsprogs:
> supersede i_dir_acl with i_size_high for all cases"
>
> 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.
>
> debugfs, e2fsck, ext2fs, mke2fs and tune2fs support is
> added.
>
> This patch depends on "e2fsprogs: supersede i_dir_acl with i_size_high
> for all cases"
>
> Signed-off-by: Alexey Lyashkov <alexey.lyashkov@...gate.com>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gate.com>
> ---
> e2fsck/pass1.c | 2 +-
> e2fsck/pass2.c | 3 ++-
> lib/ext2fs/ext2_fs.h | 3 ++-
> lib/ext2fs/ext2fs.h | 15 ++++++++++++++-
> misc/mke2fs.c | 3 ++-
> misc/tune2fs.c | 3 ++-
> 6 files changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
> index 2d21aae..8444b37 100644
> --- a/e2fsck/pass1.c
> +++ b/e2fsck/pass1.c
> @@ -2468,7 +2468,7 @@ 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 3b141db..7ded7bb 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;
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 195e366..6d9a5d0 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..5e956d0 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 1
> +#define EXT4_HTREE_LEVEL 3
> +
> +_INLINE_ unsigned int ext2_dir_htree_level(ext2_filsys fs)
> +{
> + if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
> + EXT4_FEATURE_INCOMPAT_LARGEDIR))
Please use the helper function ext2fs_has_feature_largedir() for testing
feature presence.
--D
> + 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|
> --
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