In mke2fs command, if flex_bg count is too large to filesystem blocks
count, unmountable ext4 which has the out of filesystem block offset
is created (Case1). Moreover this large flex_bg count causes an
unintentional metadata layout (bmap-imap-itable-bmap-imap-itable .. in
block group) (Case2).
To fix these issues and keep healthy flex_bg layout, disallow creating
ext4 with obviously large flex_bg count to filesystem blocks count.
Steps to reproduce:
(Case1)
1.
# mke2fs -t ext4 -b 4096 -O ^resize_inode -G $((2**20)) DEV
2130483
2.
# mount -t ext4 DEV MP
mount: wrong fs type, bad option, bad superblock on /dev/sdb4,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
3.
# dumpe2fs DEV
...
Block count:
2130483
...
Flex block group size:
1048576
...
Group 65: (Blocks
2129920-
2130482) [INODE_UNINIT]
Checksum 0x4cb3, unused inodes 8080
Block bitmap at 67 (bg #0 + 67), Inode bitmap at
1048643 (bg #32 + 67)
Inode table at
2129979-
2130483 (+59)
^^^^^^^
2130483 is out of FS!
65535 free blocks, 8080 free inodes, 0 directories, 8080 unused inodes
Free blocks:
Free inodes: 525201-533280
(Case2)
1.
# mke2fs -t ext4 -G
2147483648 DEV
3145728
2.
# debugfs -R stats DEV
...
Block count: 786432
...
Flex block group size:
2147483648
...
Group 0: block bitmap at 193, inode bitmap at 194, inode table at 195
...
Group 1: block bitmap at 707, inode bitmap at 708, inode table at 709
...
Group 2: block bitmap at 1221, inode bitmap at 1222, inode table at 1223
...
Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
unsigned int rem;
unsigned int overhead = 0;
unsigned int ipg;
+ unsigned int flexbg_size;
dgrp_t i;
blk64_t free_blocks;
+ blk64_t flexbg_overhead;
blk_t numblocks;
int rsv_gdt;
int csum_flag;
}
/*
+ * Calculate the flex_bg related metadata blocks count.
+ * It includes the boot block, the super block,
+ * the block group descriptors, the reserved gdt blocks,
+ * the block bitmaps, the inode bitmaps and the inode tables.
+ * This is a simple check, so that the backup superblock and
+ * other feature related blocks are not considered.
+ */
+ flexbg_size = 1 << fs->super->s_log_groups_per_flex;
+ flexbg_overhead = super->s_first_data_block + 1 +
+ fs->desc_blocks + super->s_reserved_gdt_blocks +
+ (__u64)flexbg_size * (2 + fs->inode_blocks_per_group);
+
+ /*
+ * Disallow creating ext4 which breaks flex_bg metadata layout
+ * obviously.
+ */
+ if (flexbg_overhead > ext2fs_blocks_count(fs->super)) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+
+ /*
* At this point we know how big the filesystem will be. So
* we can do any and all allocations that depend on the block
* count.