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Date: Mon, 30 Jan 2017 16:55:24 -0700
From: Andreas Dilger <adilger@...ger.ca>
To: "Darrick J. Wong" <darrick.wong@...cle.com>
Cc: Artem Blagodarenko <artem.blagodarenko@...gate.com>,
linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/3] e2fsck: 3 level hash tree directory optimisation
On Jan 25, 2017, at 10:23 AM, Darrick J. Wong <darrick.wong@...cle.com> wrote:
>
> On Tue, Jan 24, 2017 at 09:08:20PM +0300, Artem Blagodarenko wrote:
>> e2fsck fixed for partitions with 3 level hash directries.
>> Additional level is added to e2fsck -D codepath.
>>
>> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gate.com>
>> ---
>> debugfs/htree.c | 3 +-
>> e2fsck/e2fsck.h | 1 +
>> e2fsck/pass2.c | 72 +++++++++++++-----
>> e2fsck/rehash.c | 124 ++++++++++++++++++++++++------
>> tests/d_fallocate_blkmap/expect | 4 +-
>> tests/d_inline_dump/expect | 12 ++--
>> tests/f_convert_bmap/expect.1 | 2 +-
>> tests/f_convert_bmap_and_extent/expect.1 | 2 +-
>> tests/f_create_symlinks/expect | 8 +-
>> 9 files changed, 170 insertions(+), 58 deletions(-)
>>
>> diff --git a/debugfs/htree.c b/debugfs/htree.c
>> index 54e55e2..8c18666 100644
>> --- a/debugfs/htree.c
>> +++ b/debugfs/htree.c
>> @@ -287,7 +287,8 @@ void do_htree_dump(int argc, char *argv[])
>> fprintf(pager, "\t Indirect levels: %d\n", rootnode->indirect_levels);
>> fprintf(pager, "\t Flags: %d\n", rootnode->unused_flags);
>>
>> - ent = (struct ext2_dx_entry *) (buf + 24 + rootnode->info_length);
>> + ent = (struct ext2_dx_entry *)
>> + ((char *)rootnode + rootnode->info_length);
>>
>> htree_dump_int_node(current_fs, ino, &inode, rootnode, ent,
>> buf + current_fs->blocksize,
>> diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
>> index f356810..a4efbdf 100644
>> --- a/e2fsck/e2fsck.h
>> +++ b/e2fsck/e2fsck.h
>> @@ -122,6 +122,7 @@ struct dx_dirblock_info {
>> blk64_t phys;
>> int flags;
>> blk64_t parent;
>> + blk64_t previous;
>> ext2_dirhash_t min_hash;
>> ext2_dirhash_t max_hash;
>> ext2_dirhash_t node_min_hash;
>> diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
>> index 7ded7bb..9f5cd1b 100644
>> --- a/e2fsck/pass2.c
>> +++ b/e2fsck/pass2.c
>> @@ -85,6 +85,40 @@ struct check_dir_struct {
>> unsigned long long next_ra_off;
>> };
>>
>> +static void update_parents(struct dx_dir_info *dx_dir, int type)
>> +{
>> + struct dx_dirblock_info *dx_db, *dx_parent, *dx_previous;
>> + int b;
>> +
>> + for (b = 0, dx_db = dx_dir->dx_block;
>> + b < dx_dir->numblocks;
>> + b++, dx_db++) {
>> + dx_parent = &dx_dir->dx_block[dx_db->parent];
>> + if (dx_db->type != type ||
>> + !(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
>
> The flags check is redundant given the two if clauses.
>
>> + continue;
>> +
>> + /*
>> + * XXX Make sure dx_parent->min_hash > dx_db->min_hash
>
> "XXX" in a comment makes me think this is unfinished...?
>
> Granted, you /did/ just copy & paste the code as-is. Maybe it's better
> to let 15yo code sleep.
>
>> + */
>> + if (dx_db->flags & DX_FLAG_FIRST) {
>> + dx_parent->min_hash = dx_db->min_hash;
>> + if (dx_parent->previous) {
>> + dx_previous =
>> + &dx_dir->dx_block[dx_parent->previous];
>> + dx_previous->node_max_hash =
>> + dx_parent->min_hash;
>> + }
>> + }
>> + /*
>> + * XXX Make sure dx_parent->max_hash < dx_db->max_hash
>> + */
>> + if (dx_db->flags & DX_FLAG_LAST) {
>> + dx_parent->max_hash = dx_db->max_hash;
>> + }
>> + }
>> +}
>> +
>> void e2fsck_pass2(e2fsck_t ctx)
>> {
>> struct ext2_super_block *sb = ctx->fs->super;
>> @@ -182,24 +216,11 @@ void e2fsck_pass2(e2fsck_t ctx)
>> * Find all of the first and last leaf blocks, and
>> * update their parent's min and max hash values
>> */
>> - for (b=0, dx_db = dx_dir->dx_block;
>> - b < dx_dir->numblocks;
>> - b++, dx_db++) {
>> - if ((dx_db->type != DX_DIRBLOCK_LEAF) ||
>> - !(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
>> - continue;
>> - dx_parent = &dx_dir->dx_block[dx_db->parent];
>> - /*
>> - * XXX Make sure dx_parent->min_hash > dx_db->min_hash
>> - */
>> - if (dx_db->flags & DX_FLAG_FIRST)
>> - dx_parent->min_hash = dx_db->min_hash;
>> - /*
>> - * XXX Make sure dx_parent->max_hash < dx_db->max_hash
>> - */
>> - if (dx_db->flags & DX_FLAG_LAST)
>> - dx_parent->max_hash = dx_db->max_hash;
>> - }
>> + update_parents(dx_dir, DX_DIRBLOCK_LEAF);
>> +
>> + /* for 3 level htree: update 2 level parent's min
>> + * and max hash values */
>> + update_parents(dx_dir, DX_DIRBLOCK_NODE);
>>
>> for (b=0, dx_db = dx_dir->dx_block;
>> b < dx_dir->numblocks;
>> @@ -642,6 +663,10 @@ static void parse_int_node(ext2_filsys fs,
>> dx_db->flags |= DX_FLAG_REFERENCED;
>> dx_db->parent = db->blockcnt;
>> }
>> +
>> + dx_db->previous =
>> + i ? ext2fs_le32_to_cpu(ent[i-1].block & 0x0ffffff) : 0;
>
> Why the bit masking? Is it ever the case that the top byte is set?
The block number masking predates this patch, though it has changed from
using a 24-bit mask to a 28-bit mask to allow a larger directory to be used.
The reason for the mask on the block numbers is to allow the top bits to be
used for storing the "fullness" of the directory leaf block so that the
leaf blocks (and interior htree blocks) can be merged if large numbers of
entries in the directory are being deleted (i.e. directory shrink). That
avoids the need to constantly scan adjacent blocks to determine if they are
empty enough to be merged, and rather store a fixed-point fraction (in 1/16ths
of a block) of how full the leaf or htree block is.
The directory shrink hasn't been implemented, but the masking is cheap, and
those high bits aren't being used for anything else anyway. Even with this
feature to expand the htree to 3 levels, the largest directory with 4KB blocks
is about 540 GB, or (4096/8)^3 = 27 bits.
>> if (hash < min_hash)
>> min_hash = hash;
>> if (hash > max_hash)
>> @@ -949,6 +974,17 @@ static int check_dir_block(ext2_filsys fs,
>> return DIRENT_ABORT;
>> }
>>
>> + /* This will allow (at some point in the future) to punch out empty
>> + * directory blocks and reduce the space used by a directory that grows
>> + * very large and then the files are deleted. For now, all that is
>> + * needed is to avoid e2fsck filling in these holes as part of
>> + * feature flag. */
>> + if (db->blk == 0 &&
>> + EXT2_HAS_INCOMPAT_FEATURE(fs->super,
>> + EXT4_FEATURE_INCOMPAT_LARGEDIR)) {
>
> ext2fs_has_feature_large_dir()
>
>> + return 0;
>> + }
>> +
>> if (db->blk == 0 && !inline_data_size) {
>> if (allocate_dir_block(ctx, db, buf, &cd->pctx))
>> return 0;
>> diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
>> index 22a58f3..6d7e3df 100644
>> --- a/e2fsck/rehash.c
>> +++ b/e2fsck/rehash.c
>> @@ -603,6 +603,42 @@ static struct ext2_dx_entry
>> *set_int_node(ext2_filsys fs, char *buf)
>> return (struct ext2_dx_entry *) limits;
>> }
>>
>> +static int alloc_blocks(ext2_filsys fs,
>> + struct ext2_dx_countlimit **limit,
>> + struct ext2_dx_entry **prev_ent,
>> + struct ext2_dx_entry **next_ent,
>> + int *prev_offset, int *next_offset,
>> + struct out_dir *outdir, int i,
>> + int *prev_count, int *next_count)
Should align continued lines after '(' on previous line.
>> +{
>> + errcode_t retval;
>> + char *block_start;
>> +
>> + if (*limit)
>> + (*limit)->limit = (*limit)->count =
>> + ext2fs_cpu_to_le16((*limit)->limit);
>> + *prev_ent = (struct ext2_dx_entry *) (outdir->buf + *prev_offset);
>> + (*prev_ent)->block = ext2fs_cpu_to_le32(outdir->num);
>> +
>> + if (i != 1)
>> + (*prev_ent)->hash =
>> + ext2fs_cpu_to_le32(outdir->hashes[i]);
>> +
>> + retval = get_next_block(fs, outdir, &block_start);
>> + if (retval)
>> + return retval;
>> +
>> + *next_ent = set_int_node(fs, block_start);
>> + *limit = (struct ext2_dx_countlimit *)(*next_ent);
>> + if (next_offset)
>> + *next_offset = ((char *) *next_ent - outdir->buf);
>> +
>> + *next_count = (*limit)->limit;
>> + (*prev_offset) += sizeof(struct ext2_dx_entry);
>> + (*prev_count)--;
>> +return 0;
>
> Indentation. Speaking of which, when did all the tabs change to " "?
Right, definitely should be using tabs (8 columns).
Cheers, Andreas
>> +}
>> +
>> /*
>> * This function takes the leaf nodes which have been written in
>> * outdir, and populates the root node and any necessary interior nodes.
>> @@ -612,13 +648,13 @@ static errcode_t calculate_tree(ext2_filsys fs,
>> ext2_ino_t ino,
>> ext2_ino_t parent)
>> {
>> - struct ext2_dx_root_info *root_info;
>> - struct ext2_dx_entry *root, *dx_ent = 0;
>> - struct ext2_dx_countlimit *root_limit, *limit;
>> + struct ext2_dx_root_info *root_info;
>> + struct ext2_dx_entry *root, *int_ent, *dx_ent = 0;
>> + struct ext2_dx_countlimit *root_limit, *int_limit, *limit;
>> errcode_t retval;
>> char * block_start;
>> - int i, c1, c2, nblks;
>> - int limit_offset, root_offset;
>> + int i, c1, c2, c3, nblks;
>
> I defer to Ted on this, but I wonder if all the htree state would all be
> better off as a htree cursor structure rather than open coded stack
> variables. OTOH that's a lot of churn and I don't figure we're likely
> to get to 4-level htree ever.
>
>> + int limit_offset, int_offset, root_offset;
>>
>> root_info = set_root_node(fs, outdir->buf, ino, parent);
>> root_offset = limit_offset = ((char *) root_info - outdir->buf) +
>> @@ -628,7 +664,7 @@ static errcode_t calculate_tree(ext2_filsys fs,
>> nblks = outdir->num;
>>
>> /* Write out the pointer blocks */
>> - if (nblks-1 <= c1) {
>> + if (nblks - 1 <= c1) {
>> /* Just write out the root block, and we're done */
>> root = (struct ext2_dx_entry *) (outdir->buf + root_offset);
>> for (i=1; i < nblks; i++) {
>> @@ -639,31 +675,24 @@ static errcode_t calculate_tree(ext2_filsys fs,
>> root++;
>> c1--;
>> }
>> - } else {
>> + } else if (nblks - 1 <= (c1 * ((fs->blocksize - 8) /
>> + sizeof(*root)))) {
>
> Wishing these were proper helper functions...
>
> if (nblks - 1 <= ext2fs_htree_intnode_maxrecs(c1)) {
>
>> c2 = 0;
>> - limit = 0;
>> + limit = NULL;
>> root_info->indirect_levels = 1;
>> for (i=1; i < nblks; i++) {
>> - if (c1 == 0)
>> + if (c2 == 0 && c1 == 0)
>> return ENOSPC;
>> if (c2 == 0) {
>> - if (limit)
>> - limit->limit = limit->count =
>> - ext2fs_cpu_to_le16(limit->limit);
>> - root = (struct ext2_dx_entry *)
>> - (outdir->buf + root_offset);
>> - root->block = ext2fs_cpu_to_le32(outdir->num);
>> - if (i != 1)
>> - root->hash =
>> - ext2fs_cpu_to_le32(outdir->hashes[i]);
>> - if ((retval = get_next_block(fs, outdir,
>> - &block_start)))
>> + retval = alloc_blocks(fs, &limit,
>> + &root,
>> + &dx_ent,
>> + &root_offset,
>> + NULL,
>> + outdir, i,
>> + &c1, &c2);
>> + if (retval)
>> return retval;
>> - dx_ent = set_int_node(fs, block_start);
>> - limit = (struct ext2_dx_countlimit *) dx_ent;
>> - c2 = limit->limit;
>> - root_offset += sizeof(struct ext2_dx_entry);
>> - c1--;
>> }
>> dx_ent->block = ext2fs_cpu_to_le32(i);
>> if (c2 != limit->limit)
>> @@ -674,6 +703,51 @@ static errcode_t calculate_tree(ext2_filsys fs,
>> }
>> limit->count = ext2fs_cpu_to_le16(limit->limit - c2);
>> limit->limit = ext2fs_cpu_to_le16(limit->limit);
>> + } else {
>> + c2 = 0;
>> + c3 = 0;
>> + limit = NULL;
>> + int_limit = 0;
>> + root_info->indirect_levels = 2;
>> + for (i = 1; i < nblks; i++) {
>> + if (c3 == 0 && c2 == 0 && c1 == 0)
>> + return ENOSPC;
>> + if (c3 == 0 && c2 == 0) {
>> + retval = alloc_blocks(fs, &int_limit,
>> + &root,
>> + &int_ent,
>> + &root_offset,
>> + &int_offset,
>> + outdir, i,
>> + &c1, &c2);
>> + if (retval)
>> + return retval;
>> + }
>> + if (c3 == 0) {
>> + retval = alloc_blocks(fs, &limit,
>> + &int_ent,
>> + &dx_ent,
>> + &int_offset,
>> + NULL,
>> + outdir, i,
>> + &c2, &c3);
>> + if (retval)
>> + return retval;
>> +
>> + }
>> + dx_ent->block = ext2fs_cpu_to_le32(i);
>> + if (c3 != limit->limit)
>> + dx_ent->hash =
>> + ext2fs_cpu_to_le32(outdir->hashes[i]);
>> + dx_ent++;
>> + c3--;
>> + }
>> + int_limit->count = ext2fs_cpu_to_le16(limit->limit - c2);
>> + int_limit->limit = ext2fs_cpu_to_le16(limit->limit);
>> +
>> + limit->count = ext2fs_cpu_to_le16(limit->limit - c3);
>> + limit->limit = ext2fs_cpu_to_le16(limit->limit);
>> +
>> }
>> root_limit = (struct ext2_dx_countlimit *) (outdir->buf + limit_offset);
>> root_limit->count = ext2fs_cpu_to_le16(root_limit->limit - c1);
>> diff --git a/tests/d_fallocate_blkmap/expect b/tests/d_fallocate_blkmap/expect
>> index 8ce79ff..f588511 100644
>> --- a/tests/d_fallocate_blkmap/expect
>> +++ b/tests/d_fallocate_blkmap/expect
>> @@ -18,7 +18,7 @@ debugfs: stat /a
>> Inode: 12 Type: regular Mode: 0666 Flags: 0x0
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 40960
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>
> These belong in the patch that removes Directory ACL.
>
> --D
>
>> Links: 1 Blockcount: 82
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> @@ -30,7 +30,7 @@ debugfs: stat /b
>> Inode: 13 Type: regular Mode: 0666 Flags: 0x0
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 10240000
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 20082
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> diff --git a/tests/d_inline_dump/expect b/tests/d_inline_dump/expect
>> index c84f64d..f0ba471 100644
>> --- a/tests/d_inline_dump/expect
>> +++ b/tests/d_inline_dump/expect
>> @@ -2,7 +2,7 @@
>> Inode: 13 Type: regular Mode: 0644 Flags: 0x10000000
>> Generation: 3289262644 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 80
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec6b4:c72e3c00 -- Tue Jul 22 20:16:52 2014
>> @@ -18,7 +18,7 @@ Size of inline data: 80
>> Inode: 18 Type: regular Mode: 0644 Flags: 0x10000000
>> Generation: 3842229473 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 20
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec6b4:cafecc00 -- Tue Jul 22 20:16:52 2014
>> @@ -35,7 +35,7 @@ Size of inline data: 60
>> Inode: 16 Type: directory Mode: 0755 Flags: 0x10000000
>> Generation: 3842229469 Version: 0x00000000:00000004
>> User: 0 Group: 0 Size: 132
>> -File ACL: 7 Directory ACL: 0
>> +File ACL: 7
>> Links: 2 Blockcount: 8
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec6e3:27eac000 -- Tue Jul 22 20:17:39 2014
>> @@ -51,7 +51,7 @@ Size of inline data: 132
>> Inode: 20 Type: directory Mode: 0755 Flags: 0x10000000
>> Generation: 3710818931 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 60
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 2 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec6b4:ca0aa800 -- Tue Jul 22 20:16:52 2014
>> @@ -68,7 +68,7 @@ Size of inline data: 60
>> Inode: 12 Type: symlink Mode: 0777 Flags: 0x10000000
>> Generation: 3289262643 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 80
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec47f:724db800 -- Tue Jul 22 20:07:27 2014
>> @@ -83,7 +83,7 @@ Fast link dest:
>> "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Inode: 19 Type: symlink Mode: 0777 Flags: 0x0
>> Generation: 3842229474 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 20
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x53cec44c:a1fcc000 -- Tue Jul 22 20:06:36 2014
>> diff --git a/tests/f_convert_bmap/expect.1 b/tests/f_convert_bmap/expect.1
>> index 7d2ca86..0291f94 100644
>> --- a/tests/f_convert_bmap/expect.1
>> +++ b/tests/f_convert_bmap/expect.1
>> @@ -2,7 +2,7 @@ debugfs: stat /a
>> Inode: 12 Type: regular Mode: 0644 Flags: 0x0
>> Generation: 1573716129 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 524288
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 1030
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x5457f87a:62ae2980 -- Mon Nov 3 21:49:46 2014
>> diff --git a/tests/f_convert_bmap_and_extent/expect.1
>> b/tests/f_convert_bmap_and_extent/expect.1
>> index 7af91aa..eb55db7 100644
>> --- a/tests/f_convert_bmap_and_extent/expect.1
>> +++ b/tests/f_convert_bmap_and_extent/expect.1
>> @@ -2,7 +2,7 @@ debugfs: stat /a
>> Inode: 12 Type: regular Mode: 0644 Flags: 0x0
>> Generation: 1573716129 Version: 0x00000000:00000001
>> User: 0 Group: 0 Size: 524288
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 1030
>> Fragment: Address: 0 Number: 0 Size: 0
>> ctime: 0x5457f87a:62ae2980 -- Mon Nov 3 21:49:46 2014
>> diff --git a/tests/f_create_symlinks/expect b/tests/f_create_symlinks/expect
>> index dca6e92..4409385 100644
>> --- a/tests/f_create_symlinks/expect
>> +++ b/tests/f_create_symlinks/expect
>> @@ -20,7 +20,7 @@ debugfs -R "stat /l_30" test.img
>> Inode: 12 Type: symlink Mode: 0777 Flags: 0x0
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 31
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> @@ -29,7 +29,7 @@ debugfs -R "stat /l_70" test.img
>> Inode: 13 Type: symlink Mode: 0777 Flags: 0x10000000
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 71
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 0
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> @@ -40,7 +40,7 @@ debugfs -R "stat /l_500" test.img
>> Inode: 14 Type: symlink Mode: 0777 Flags: 0x80000
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 501
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 2
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> @@ -50,7 +50,7 @@ debugfs -R "stat /l_1023" test.img
>> Inode: 15 Type: symlink Mode: 0777 Flags: 0x80000
>> Generation: 0 Version: 0x00000000:00000000
>> User: 0 Group: 0 Project: 0 Size: 1024
>> -File ACL: 0 Directory ACL: 0
>> +File ACL: 0
>> Links: 1 Blockcount: 2
>> Fragment: Address: 0 Number: 0 Size: 0
>> Size of extra inode fields: 32
>> --
Cheers, Andreas
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