Fix kernel BUG at fs/ext4/mballoc.c:910!
From: Valerie Clement <[EMAIL PROTECTED]>
With the flex_bg feature enabled, a large file creation oopses the
kernel.
The BUG_ON is:
BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));
As the allocation of the bitmaps and the inode table can be done
outside the block group with flex_bg, this allows to allocate up to
EXT4_BLOCKS_PER_GROUP blocks in a group.
This patch fixes the oops.
Signed-off-by: Valerie Clement <[EMAIL PROTECTED]>
---
fs/ext4/mballoc.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index b0f84b4..0275150 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -907,7 +907,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
unsigned short chunk;
unsigned short border;
- BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));
+ BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
border = 2 << sb->s_blocksize_bits;
@@ -3286,7 +3286,7 @@ static void ext4_mb_normalize_request(struct
ext4_allocation_context *ac,
}
BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
start > ac->ac_o_ex.fe_logical);
- BUG_ON(size <= 0 || size >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
+ BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
/* now prepare goal request */
-
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