On Thu, 2008-02-14 at 17:35 +0100, Valerie Clement wrote: > Fix kernel BUG at fs/ext4/mballoc.c:910! > > From: Valerie Clement <valerie.clement@xxxxxxxx> > > 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. > Depending on the group size and the block size, extents might be > larger than BLOCKS_PER_GROUP(); use EXT_INIT_MAX_LEN instead of > BLOCKS_PER_GROUP(). > Yep, I think using EXT_INIT_MAX_LEN is better. Will add to the patch queue shortly. Thanks, Mingming > This patch fixes the oops. > > Signed-off-by: Valerie Clement <valerie.clement@xxxxxxxx> > --- > > fs/ext4/mballoc.c | 5 ++++- > 1 files changed, 4 insertions(+), 1 deletions(-) > > diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c > index b0f84b4..ccc33e9 100644 > --- a/fs/ext4/mballoc.c > +++ b/fs/ext4/mballoc.c > @@ -34,6 +34,7 @@ > #include <linux/pagemap.h> > #include <linux/seq_file.h> > #include <linux/version.h> > +#include <linux/ext4_fs_extents.h> > #include "group.h" > > /* > @@ -907,7 +908,9 @@ 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_HAS_INCOMPAT_FEATURE(sb, > + EXT4_FEATURE_INCOMPAT_FLEX_BG) ? EXT_INIT_MAX_LEN : > + EXT4_BLOCKS_PER_GROUP(sb)); > > border = 2 << sb->s_blocksize_bits; > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
