ext4: Don't panic in case of corrupt bitmap
Multiblock allocator calls BUG_ON in many case if the free and used blocks count obtained looking at the bitmap is different from what the allocator internally accounted for. Use ext4_error in such case and don't panic the system. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -681,7 +681,6 @@ static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
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{
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char *bb;
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/* FIXME!! is this needed */
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BUG_ON(EXT4_MB_BITMAP(e4b) == EXT4_MB_BUDDY(e4b));
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BUG_ON(max == NULL);
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@ -965,7 +964,7 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
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grp->bb_fragments = fragments;
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if (free != grp->bb_free) {
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printk(KERN_DEBUG
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ext4_error(sb, __FUNCTION__,
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"EXT4-fs: group %lu: %u blocks in bitmap, %u in gd\n",
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group, free, grp->bb_free);
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grp->bb_free = free;
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@ -1822,13 +1821,24 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
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i = ext4_find_next_zero_bit(bitmap,
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EXT4_BLOCKS_PER_GROUP(sb), i);
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if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
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BUG_ON(free != 0);
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/*
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* IF we corrupt the bitmap we won't find any
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* free blocks even though group info says we
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* we have free blocks
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*/
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ext4_error(sb, __FUNCTION__, "%d free blocks as per "
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"group info. But bitmap says 0\n",
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free);
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break;
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}
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mb_find_extent(e4b, 0, i, ac->ac_g_ex.fe_len, &ex);
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BUG_ON(ex.fe_len <= 0);
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BUG_ON(free < ex.fe_len);
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if (free < ex.fe_len) {
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ext4_error(sb, __FUNCTION__, "%d free blocks as per "
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"group info. But got %d blocks\n",
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free, ex.fe_len);
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}
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ext4_mb_measure_extent(ac, &ex, e4b);
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@ -3363,13 +3373,10 @@ static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
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ac->ac_pa = pa;
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/* we don't correct pa_pstart or pa_plen here to avoid
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* possible race when tte group is being loaded concurrently
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* possible race when the group is being loaded concurrently
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* instead we correct pa later, after blocks are marked
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* in on-disk bitmap -- see ext4_mb_release_context() */
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/*
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* FIXME!! but the other CPUs can look at this particular
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* pa and think that it have enought free blocks if we
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* don't update pa_free here right ?
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* in on-disk bitmap -- see ext4_mb_release_context()
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* Other CPUs are prevented from allocating from this pa by lg_mutex
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*/
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mb_debug("use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa);
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}
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@ -3758,13 +3765,13 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
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bit = next + 1;
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}
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if (free != pa->pa_free) {
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printk(KERN_ERR "pa %p: logic %lu, phys. %lu, len %lu\n",
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printk(KERN_CRIT "pa %p: logic %lu, phys. %lu, len %lu\n",
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pa, (unsigned long) pa->pa_lstart,
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(unsigned long) pa->pa_pstart,
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(unsigned long) pa->pa_len);
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printk(KERN_ERR "free %u, pa_free %u\n", free, pa->pa_free);
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ext4_error(sb, __FUNCTION__, "free %u, pa_free %u\n",
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free, pa->pa_free);
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}
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BUG_ON(free != pa->pa_free);
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atomic_add(free, &sbi->s_mb_discarded);
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if (ac)
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kmem_cache_free(ext4_ac_cachep, ac);
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@ -4435,7 +4442,7 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
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unsigned long block, unsigned long count,
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int metadata, unsigned long *freed)
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{
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struct buffer_head *bitmap_bh = 0;
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struct buffer_head *bitmap_bh = NULL;
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struct super_block *sb = inode->i_sb;
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struct ext4_allocation_context *ac = NULL;
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struct ext4_group_desc *gdp;
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