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befs: add check for ag_shift in superblock

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ag_shift and blocks_per_ag contain the same information in different ways,
same as block_shift and block_size do. It is worth checking this two are
consistent, but since blocks_per_ag isn't documented as mandatory to use
some implementations of befs don't enforce this, so making it non-fatal if
they don't match and just having it as a warning.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Salah Triki <salah.triki@gmail.com>
This commit is contained in:
Luis de Bethencourt 2016-08-09 22:23:36 +01:00
parent d1a8c70676
commit bbe1bd0b6b
1 changed files with 7 additions and 0 deletions
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7
fs/befs/super.c
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@ -103,6 +103,13 @@ befs_check_sb(struct super_block *sb)
return BEFS_ERR;
}
/* ag_shift also encodes the same information as blocks_per_ag in a
* different way, non-fatal consistency check
*/
if ((1 << befs_sb->ag_shift) != befs_sb->blocks_per_ag)
befs_error(sb, "ag_shift disagrees with blocks_per_ag.");
if (befs_sb->log_start != befs_sb->log_end || befs_sb->flags == BEFS_DIRTY) {
befs_error(sb, "Filesystem not clean! There are blocks in the "
"journal. You must boot into BeOS and mount this volume "