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Date: Tue, 24 Jan 2017 21:08:20 +0300
From: Artem Blagodarenko <artem.blagodarenko@...gate.com>
To: linux-ext4@...r.kernel.org
Subject: [PATCH 2/3] e2fsck: 3 level hash tree directory optimisation
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)))
+ continue;
+
+ /*
+ * 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;
+ 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;
+
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)) {
+ 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)
+{
+ 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;
+}
+
/*
* 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;
+ 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)))) {
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
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
--
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