Re: [PATCH 1/3] mke2fs: enable large directroy support

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On Tue, Jan 24, 2017 at 07:34:13PM +0300, Artem Blagodarenko wrote:
> 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.
> 
> Signed-off-by: Alexey Lyashkov <alexey.lyashkov@xxxxxxxxxxx>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@xxxxxxxxxxx>
> ---
>  debugfs/debugfs.c            |   16 +++++++---------
>  debugfs/set_fields.c         |    1 -
>  e2fsck/message.c             |    4 ----
>  e2fsck/pass1.c               |    5 ++---
>  e2fsck/pass2.c               |   11 ++---------
>  e2fsck/problem.c             |    5 -----
>  e2fsck/problem.h             |    3 ---
>  lib/ext2fs/ext2_fs.h         |    9 ++++-----
>  lib/ext2fs/ext2fs.h          |   15 ++++++++++++++-
>  lib/ext2fs/swapfs.c          |    2 +-
>  misc/mke2fs.c                |    3 ++-
>  misc/tune2fs.c               |    3 ++-
>  tests/d_special_files/expect |   10 +++++-----
>  tests/f_badcluster/expect    |   14 +++++++-------
>  tests/f_recnect_bad/expect.1 |    3 ---
>  15 files changed, 46 insertions(+), 58 deletions(-)
> 
> diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
> index b40d9e2..795bdc3 100644
> --- a/debugfs/debugfs.c
> +++ b/debugfs/debugfs.c
> @@ -841,16 +841,15 @@ void internal_dump_inode(FILE *out, const char *prefix,
>          fprintf(out, "%d\n", inode->i_size);
>      if (os == EXT2_OS_HURD)
>          fprintf(out,
> -            "%sFile ACL: %d    Directory ACL: %d Translator: %d\n",
> +            "%sFile ACL: %d Translator: %d\n",
>              prefix,
> -            inode->i_file_acl, LINUX_S_ISDIR(inode->i_mode) ?
> inode->i_dir_acl : 0,
> +            inode->i_file_acl,
>              inode->osd1.hurd1.h_i_translator);
>      else
> -        fprintf(out, "%sFile ACL: %llu    Directory ACL: %d\n",
> +        fprintf(out, "%sFile ACL: %llu\n",
>              prefix,
>              inode->i_file_acl | ((long long)
> -                (inode->osd2.linux2.l_i_file_acl_high) << 32),
> -            LINUX_S_ISDIR(inode->i_mode) ? inode->i_dir_acl : 0);
> +                (inode->osd2.linux2.l_i_file_acl_high) << 32));
>      if (os != EXT2_OS_HURD)
>          fprintf(out, "%sLinks: %d   Blockcount: %llu\n",
>              prefix, inode->i_links_count,
> @@ -1347,10 +1346,9 @@ void do_modify_inode(int argc, char *argv[])
>      modify_u32(argv[0], "Reserved1", decimal_format, &inode.i_reserved1);
>  #endif
>      modify_u32(argv[0], "File acl", decimal_format, &inode.i_file_acl);
> -    if (LINUX_S_ISDIR(inode.i_mode))
> -        modify_u32(argv[0], "Directory acl", decimal_format, &inode.i_dir_acl);
> -    else
> -        modify_u32(argv[0], "High 32bits of size", decimal_format,
> &inode.i_size_high);
> +
> +    modify_u32(argv[0], "High 32bits of size", decimal_format,
> +           &inode.i_size_high);

Ugh, this patch removes dir_acl /and/ adds support for 3-level htrees!

Please break this up into separate patches for each of those two changes.

"e2fsprogs: supersede i_dir_acl with i_size_high for all cases"
"e2fsprogs: add support for 3-level htree"

> 
>      if (os == EXT2_OS_HURD)
>          modify_u32(argv[0], "Translator Block",
> diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
> index ff9b7b6..ca68862 100644
> --- a/debugfs/set_fields.c
> +++ b/debugfs/set_fields.c
> @@ -212,7 +212,6 @@ static struct field_set_info inode_fields[] = {
>      /* Special case: i_file_acl_high is 2 bytes */
>      { "file_acl", &set_inode.i_file_acl,
>          &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
> -    { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint, FLAG_ALIAS },
>      { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
>      { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint,
> FLAG_ALIAS },
>      { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
> diff --git a/e2fsck/message.c b/e2fsck/message.c
> index 1c3fcd8..d21ba05 100644
> --- a/e2fsck/message.c
> +++ b/e2fsck/message.c
> @@ -318,10 +318,6 @@ static _INLINE_ void expand_inode_expression(FILE
> *f, ext2_filsys fs, char ch,
>      case 'f':
>          fprintf(f, "%llu", ext2fs_file_acl_block(fs, inode));
>          break;
> -    case 'd':
> -        fprintf(f, "%u", (LINUX_S_ISDIR(inode->i_mode) ?
> -                  inode->i_dir_acl : 0));
> -        break;
>      case 'u':
>          fprintf(f, "%d", inode_uid(*inode));
>          break;
> diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
> index 8ef40f6..8444b37 100644
> --- a/e2fsck/pass1.c
> +++ b/e2fsck/pass1.c
> @@ -1715,8 +1715,7 @@ void e2fsck_pass1(e2fsck_t ctx)
>              frag = fsize = 0;
>          }
> 
> -        if (inode->i_faddr || frag || fsize ||
> -            (LINUX_S_ISDIR(inode->i_mode) && inode->i_dir_acl))
> +        if (inode->i_faddr || frag || fsize)
>              mark_inode_bad(ctx, ino);
>          if ((fs->super->s_creator_os != EXT2_OS_HURD) &&
>              !ext2fs_has_feature_64bit(fs->super) &&
> @@ -2469,7 +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 11c19e8..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;
> @@ -1811,14 +1812,6 @@ int e2fsck_process_bad_inode(e2fsck_t ctx,
> ext2_ino_t dir,
>          } else
>              not_fixed++;
>      }
> -    if (inode.i_dir_acl &&
> -        LINUX_S_ISDIR(inode.i_mode)) {
> -        if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
> -            inode.i_dir_acl = 0;
> -            inode_modified++;
> -        } else
> -            not_fixed++;
> -    }
> 
>      if (inode_modified)
>          e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
> diff --git a/e2fsck/problem.c b/e2fsck/problem.c
> index 34a671e..ce2f79d 100644
> --- a/e2fsck/problem.c
> +++ b/e2fsck/problem.c
> @@ -1360,11 +1360,6 @@ static struct e2fsck_problem problem_table[] = {
>        N_("i_file_acl @F %If, @s zero.\n"),
>        PROMPT_CLEAR, 0 },
> 
> -    /* i_dir_acl should be zero */
> -    { PR_2_DIR_ACL_ZERO,
> -      N_("i_dir_acl @F %Id, @s zero.\n"),
> -      PROMPT_CLEAR, 0 },
> -
>      /* i_frag should be zero */
>      { PR_2_FRAG_ZERO,
>        N_("i_frag @F %N, @s zero.\n"),
> diff --git a/e2fsck/problem.h b/e2fsck/problem.h
> index 86cb614..f07f9b6 100644
> --- a/e2fsck/problem.h
> +++ b/e2fsck/problem.h
> @@ -808,9 +808,6 @@ struct problem_context {
>  /* i_file_acl should be zero */
>  #define PR_2_FILE_ACL_ZERO    0x02000E
> 
> -/* i_dir_acl should be zero */
> -#define PR_2_DIR_ACL_ZERO    0x02000F
> -
>  /* i_frag should be zero */
>  #define PR_2_FRAG_ZERO        0x020010
> 
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 27a7d3a..6d9a5d0 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -398,7 +398,7 @@ struct ext2_inode {
>      __u32    i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
>      __u32    i_generation;    /* File version (for NFS) */
>      __u32    i_file_acl;    /* File ACL */
> -    __u32    i_size_high;    /* Formerly i_dir_acl, directory ACL */
> +    __u32    i_size_high;
>      __u32    i_faddr;    /* Fragment address */
>      union {
>          struct {
> @@ -446,7 +446,7 @@ struct ext2_inode_large {
>      __u32    i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
>      __u32    i_generation;    /* File version (for NFS) */
>      __u32    i_file_acl;    /* File ACL */
> -    __u32    i_size_high;    /* Formerly i_dir_acl, directory ACL */
> +    __u32    i_size_high;
>      __u32    i_faddr;    /* Fragment address */
>      union {
>          struct {
> @@ -484,8 +484,6 @@ struct ext2_inode_large {
>  #define EXT4_EPOCH_BITS 2
>  #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
> 
> -#define i_dir_acl    i_size_high
> -
>  #define i_checksum_lo    osd2.linux2.l_i_checksum_lo
> 
>  #define inode_includes(size, field)            \
> @@ -923,7 +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

Three levels...

1k: 126^3 * 123 = ~246 million blocks
4k: 510^3 * 507 = ~67.3 billion dirent blocks.
64k: 8190^3 * 8187 = ~4.5 quadrillion dirent blocks

I was about to wonder why not permit enough levels to fill out a full
2^63 byte directory, but then considered that three is probably enough.

(Also I wasn't sure if ext4 still loads the whole dir into kernel memory...)

> +
> +_INLINE_ unsigned int ext2_dir_htree_level(ext2_filsys fs)
> +{
> +        if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
> +                          EXT4_FEATURE_INCOMPAT_LARGEDIR))

if (ext2fs_has_feature_largedir(...))

> +                    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/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
> index d63fc55..2d05ee7 100644
> --- a/lib/ext2fs/swapfs.c
> +++ b/lib/ext2fs/swapfs.c
> @@ -247,7 +247,7 @@ void ext2fs_swap_inode_full(ext2_filsys fs, struct
> ext2_inode_large *t,
>          has_extents = 1;
>      if (!hostorder && (t->i_flags & EXT4_INLINE_DATA_FL))
>          has_inline_data = 1;
> -    t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
> +    t->i_size_high = ext2fs_swab32(f->i_size_high);
>      /*
>       * Extent data and inline data are swapped on access, not here
>       */
> 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|
> diff --git a/tests/d_special_files/expect b/tests/d_special_files/expect
> index f729b0f..c825932 100644
> --- a/tests/d_special_files/expect
> +++ b/tests/d_special_files/expect
> @@ -5,7 +5,7 @@ debugfs -R ''stat foo'' -w test.img
>  Inode: 12   Type: symlink    Mode:  0777   Flags: 0x0
>  Generation: 0    Version: 0x00000000
>  User:     0   Group:     0   Size: 3
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 0
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x50f560e0 -- Tue Jan 15 14:00:00 2013
> @@ -17,7 +17,7 @@ debugfs -R ''stat foo2'' -w test.img
>  Inode: 13   Type: symlink    Mode:  0777   Flags: 0x0
>  Generation: 0    Version: 0x00000000
>  User:     0   Group:     0   Size: 80
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 2
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x50f560e0 -- Tue Jan 15 14:00:00 2013
> @@ -42,7 +42,7 @@ debugfs -R ''stat pipe'' -w test.img
>  Inode: 14   Type: FIFO    Mode:  0000   Flags: 0x0
>  Generation: 0    Version: 0x00000000
>  User:     0   Group:     0   Size: 0
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 0
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x50f560e0 -- Tue Jan 15 14:00:00 2013
> @@ -55,7 +55,7 @@ debugfs -R ''stat sda'' -w test.img
>  Inode: 15   Type: block special    Mode:  0000   Flags: 0x0
>  Generation: 0    Version: 0x00000000
>  User:     0   Group:     0   Size: 0
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 0
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x50f560e0 -- Tue Jan 15 14:00:00 2013
> @@ -67,7 +67,7 @@ debugfs -R ''stat null'' -w test.img
>  Inode: 16   Type: character special    Mode:  0000   Flags: 0x0
>  Generation: 0    Version: 0x00000000
>  User:     0   Group:     0   Size: 0
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 0
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x50f560e0 -- Tue Jan 15 14:00:00 2013
> diff --git a/tests/f_badcluster/expect b/tests/f_badcluster/expect
> index 65a1641..75a3820 100644
> --- a/tests/f_badcluster/expect
> +++ b/tests/f_badcluster/expect
> @@ -116,7 +116,7 @@ debugfs: stat /a
>  Inode: 12   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152157    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -128,7 +128,7 @@ debugfs: stat /b
>  Inode: 13   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152158    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -140,7 +140,7 @@ debugfs: stat /c
>  Inode: 14   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152159    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -152,7 +152,7 @@ debugfs: stat /d
>  Inode: 15   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152160    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 0
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -163,7 +163,7 @@ debugfs: stat /e
>  Inode: 16   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152161    Version: 0x00000001
>  User:     0   Group:     0   Size: 6144
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -175,7 +175,7 @@ debugfs: stat /f
>  Inode: 17   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152162    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> @@ -187,7 +187,7 @@ debugfs: stat /g
>  Inode: 18   Type: regular    Mode:  0644   Flags: 0x80000
>  Generation: 1117152163    Version: 0x00000001
>  User:     0   Group:     0   Size: 3072
> -File ACL: 0    Directory ACL: 0
> +File ACL: 0
>  Links: 1   Blockcount: 32
>  Fragment:  Address: 0    Number: 0    Size: 0
>  ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
> diff --git a/tests/f_recnect_bad/expect.1 b/tests/f_recnect_bad/expect.1
> index 8ba81e6..6433c8d 100644
> --- a/tests/f_recnect_bad/expect.1
> +++ b/tests/f_recnect_bad/expect.1
> @@ -3,9 +3,6 @@ Pass 2: Checking directory structure
>  i_faddr for inode 15 (/test/quux) is 23, should be zero.
>  Clear? yes
> 
> -i_dir_acl for inode 15 (/test/quux) is 12, should be zero.
> -Clear? yes
> -
>  i_file_acl for inode 13 (/test/???) is 12, should be zero.
>  Clear? yes

Will a test case be provided to demonstrate that e2fsck can handle
rebuilding a >1 level htree dir?

--D
> 
> --



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