Hello, all?
Currently ext2ls, ext2load not working (I think sometimes it will work.) The reason is incorrect operations of ext2fs_read_inode and ext2fs_blockgroup.
I fix miscalculated block number(blkno) and offset (blkoff), and some hard coded values.
unsik Kim
Signed-off-by: unsik Kim donari75@gmail.com --- diff --git a/Makefile b/Makefile index d26a004..9e9ba36 100644 --- a/Makefile +++ b/Makefile @@ -403,6 +403,7 @@ TAG_SUBDIRS += fs/fat TAG_SUBDIRS += fs/fdos TAG_SUBDIRS += fs/jffs2 TAG_SUBDIRS += fs/yaffs2 +TAG_SUBDIRS += fs/ext2 TAG_SUBDIRS += net TAG_SUBDIRS += disk TAG_SUBDIRS += common diff --git a/fs/ext2/ext2fs.c b/fs/ext2/ext2fs.c index 436f4a4..4ac2bdd 100644 --- a/fs/ext2/ext2fs.c +++ b/fs/ext2/ext2fs.c @@ -110,6 +110,7 @@ struct ext2_block_group { uint32_t inode_table_id; uint16_t free_blocks; uint16_t free_inodes; + uint16_t used_dir_cnt; uint16_t pad; uint32_t reserved[3]; }; @@ -182,14 +183,22 @@ int indir2_blkno = -1;
static int ext2fs_blockgroup (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) { + unsigned int blkno; + unsigned int blkoff; + unsigned int desc_per_blk; + + desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); + + blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 + + group / desc_per_blk; + blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); #ifdef DEBUG - printf ("ext2fs read blockgroup\n"); + printf ("ext2fs read %d group descriptor (blkno %d blkoff %d)\n", + group, blkno, blkoff); #endif return (ext2fs_devread - (((__le32_to_cpu (data->sblock.first_data_block) + - 1) << LOG2_EXT2_BLOCK_SIZE (data)), - group * sizeof (struct ext2_block_group), - sizeof (struct ext2_block_group), (char *) blkgrp)); + (blkno << LOG2_EXT2_BLOCK_SIZE(data), + blkoff, sizeof(struct ext2_block_group), (char *)blkgrp)); }
@@ -203,11 +212,11 @@ static int ext2fs_read_inode unsigned int blkno; unsigned int blkoff;
- /* It is easier to calculate if the first inode is 0. */ - ino--; #ifdef DEBUG printf ("ext2fs read inode %d\n", ino); #endif + /* It is easier to calculate if the first inode is 0. */ + ino--; status = ext2fs_blockgroup (data, ino / __le32_to_cpu (sblock->inodes_per_group), @@ -215,19 +224,16 @@ static int ext2fs_read_inode if (status == 0) { return (0); } - inodes_per_block = EXT2_BLOCK_SIZE (data) / 128; - blkno = (ino % __le32_to_cpu (sblock->inodes_per_group)) / - inodes_per_block; - blkoff = (ino % __le32_to_cpu (sblock->inodes_per_group)) % - inodes_per_block; + inodes_per_block = EXT2_BLOCK_SIZE(data) / __le32_to_cpu(sblock->inode_size); + blkno = blkgrp.inode_table_id + + (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; + blkoff = (ino % inodes_per_block) * __le32_to_cpu(sblock->inode_size); #ifdef DEBUG printf ("ext2fs read inode blkno %d blkoff %d\n", blkno, blkoff); #endif /* Read the inode. */ - status = ext2fs_devread (((__le32_to_cpu (blkgrp.inode_table_id) + - blkno) << LOG2_EXT2_BLOCK_SIZE (data)), - sizeof (struct ext2_inode) * blkoff, - sizeof (struct ext2_inode), (char *) inode); + status = ext2fs_devread (blkno << LOG2_EXT2_BLOCK_SIZE (data), blkoff, + sizeof (struct ext2_inode), (char *) inode); if (status == 0) { return (0); }