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resize2fs: fix -M size calculations to avoid cutting off the inode table 

If the file system's inode table blocks in the last block group are
located in the middle or the end of the block group, it's possible for
resize2fs -M to use a size which will require relocating the inode
table blocks in the last block group.  This can lead to all sorts of
problems, so solve it by simply guaranteeing that we will never do
that.

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
debian-1.42.9
Theodore Ts'o 2013-09-30 22:35:14 -04:00
parent e231f17500
commit 2215293c7e
1 changed files with 9 additions and 0 deletions
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9
resize/resize2fs.c
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@ -2224,6 +2224,15 @@ blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
blks_needed = (groups-1) * EXT2_BLOCKS_PER_GROUP(fs->super);
blks_needed += overhead;
/*
* Make sure blks_needed covers the end of the inode table in
* the last block group.
*/
overhead = ext2fs_inode_table_loc(fs, groups-1) +
fs->inode_blocks_per_group;
if (blks_needed < overhead)
blks_needed = overhead;
#ifdef RESIZE2FS_DEBUG
if (flags & RESIZE_DEBUG_MIN_CALC)
printf("Estimated blocks needed: %llu\n", blks_needed);