From: Niu YaWei Don't put root block of quota tree to the free list (when quota file is completely empty). That should not actually happen anyway (somebody should get accounted for the filesystem root and so quota file should never be empty) but better prevent it here than solve magical quota file corruption. Signed-off-by: Jan Kara Signed-off-by: Andrew Morton --- 25-akpm/fs/quota_v2.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletion(-) diff -puN fs/quota_v2.c~quota-possible-bug-in-quota-format-v2-support fs/quota_v2.c --- 25/fs/quota_v2.c~quota-possible-bug-in-quota-format-v2-support Thu Mar 31 14:54:22 2005 +++ 25-akpm/fs/quota_v2.c Thu Mar 31 14:54:22 2005 @@ -503,7 +503,8 @@ static int remove_tree(struct dquot *dqu int i; ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(0); for (i = 0; i < V2_DQBLKSIZE && !buf[i]; i++); /* Block got empty? */ - if (i == V2_DQBLKSIZE) { + /* Don't put the root block into the free block list */ + if (i == V2_DQBLKSIZE && *blk != V2_DQTREEOFF) { put_free_dqblk(sb, type, buf, *blk); *blk = 0; } _