From: Artem Blagodarenko <artem.blagodarenko@xxxxxxxxxxx>
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>
---
e2fsck/pass1.c | 5 +++--
e2fsck/pass2.c | 5 +++--
lib/ext2fs/ext2_fs.h | 3 ++-
lib/ext2fs/ext2fs.h | 21 ++++++++++++++++++++-
misc/mke2fs.c | 3 ++-
misc/tune2fs.c | 3 ++-
6 files changed, 32 insertions(+), 8 deletions(-)
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index ce37176..fff7dcf 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_large_dir(fs) &&
+ (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..139d48f 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_large_dir(fs) &&
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..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..d714b44 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 +1925,24 @@ _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_ int ext2fs_has_feature_large_dir(ext2_filsys fs)
+{
+ return EXT2_HAS_INCOMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_INCOMPAT_LARGEDIR);
+}
+
+_INLINE_ unsigned int ext2_dir_htree_level(ext2_filsys fs)
+{
+ if (ext2fs_has_feature_large_dir(fs))
+ 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
