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btrfs-progs: convert: fix support for e2fsprogs < 1.42

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Commit 324d4c1857 (btrfs-progs: convert: Add larger device support)
introduced new dependencies on the 64-bit API provided by e2fsprogs.
That API was introduced in v1.42 (along with bigalloc).

This patch maps the following to their equivalents in e2fsprogs < 1.42.
- ext2fs_get_block_bitmap_range2
- ext2fs_inode_data_blocks2
- ext2fs_read_ext_attr2

Since we need to detect and define EXT2_FLAG_64BITS for compatibilty
anyway, it makes sense to use that to detect the older e2fsprogs instead
of defining a new flag ourselves.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2018-04-30 10:37:06 -04:00 committed by David Sterba
parent 4aebb2588c
commit 36da47b409
2 changed files with 12 additions and 6 deletions
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6
configure.ac
View File

@ -144,11 +144,7 @@ BTRFSCONVERT_EXT2=0
BTRFSCONVERT_REISERFS=0
if test "x$enable_convert" = xyes; then
if test "x$with_convert" = "xauto" || echo "$with_convert" | grep -q "ext2"; then
PKG_CHECK_MODULES(EXT2FS, [ext2fs >= 1.42],,
[PKG_CHECK_MODULES(EXT2FS, [ext2fs],
[AC_DEFINE([HAVE_OLD_E2FSPROGS], [1],
[E2fsprogs does not support BIGALLOC])]
)])
PKG_CHECK_MODULES(EXT2FS, [ext2fs])
PKG_CHECK_MODULES(COM_ERR, [com_err])
convertfs="${convertfs:+$convertfs,}ext2"
BTRFSCONVERT_EXT2=1

12
convert/source-ext2.h
View File

@ -33,8 +33,18 @@
* BIGALLOC.
* Unlike normal RO compat flag, BIGALLOC affects how e2fsprogs check used
* space, and btrfs-convert heavily relies on it.
*
* e2fsprogs 1.42 also introduced the 64-bit API. Any file system
* that requires it will have EXT4_FEATURE_INCOMPAT_64BIT set and
* will fail to open with earlier releases. We can map it to the
* older API without risk of corruption.
*/
#ifdef HAVE_OLD_E2FSPROGS
#ifndef EXT2_FLAG_64BITS
#define EXT2_FLAG_64BITS (0)
#define ext2fs_get_block_bitmap_range2 ext2fs_get_block_bitmap_range
#define ext2fs_inode_data_blocks2 ext2fs_inode_data_blocks
#define ext2fs_read_ext_attr2 ext2fs_read_ext_attr
#define ext2fs_blocks_count(s) ((s)->s_blocks_count)
#define EXT2FS_CLUSTER_RATIO(fs) (1)
#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_BLOCKS_PER_GROUP(s))
#define EXT2FS_B2C(fs, blk) (blk)