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Fix ext4 block group descriptor sizing

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Ext4 allows for arbitrarily sized block group descriptors when 64-bit
addressing is enabled, which was previously not properly supported. This
patch dynamically allocates a chunk of memory of the correct size.

Signed-off-by: Benjamin Lim <jarsp.ctf@gmail.com>
This commit is contained in:
Benjamin Lim 2019-03-29 07:29:45 -04:00 committed by Tom Rini
parent e551979790
commit febbc58331
1 changed files with 15 additions and 4 deletions
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19
fs/ext4/ext4_common.c
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@ -1587,7 +1587,7 @@ static int ext4fs_blockgroup
int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
{
struct ext2_block_group blkgrp;
struct ext2_block_group *blkgrp;
struct ext2_sblock *sblock = &data->sblock;
struct ext_filesystem *fs = get_fs();
int log2blksz = get_fs()->dev_desc->log2blksz;
@ -1595,17 +1595,28 @@ int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
long int blkno;
unsigned int blkoff;
/* Allocate blkgrp based on gdsize (for 64-bit support). */
blkgrp = zalloc(get_fs()->gdsize);
if (!blkgrp)
return 0;
/* It is easier to calculate if the first inode is 0. */
ino--;
status = ext4fs_blockgroup(data, ino / le32_to_cpu
(sblock->inodes_per_group), &blkgrp);
if (status == 0)
(sblock->inodes_per_group), blkgrp);
if (status == 0) {
free(blkgrp);
return 0;
}
inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) +
(ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
blkoff = (ino % inodes_per_block) * fs->inodesz;
/* Free blkgrp as it is no longer required. */
free(blkgrp);
/* Read the inode. */
status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
log2blksz), blkoff,