ext4: fix online resize with very large inode tables

If a file system has a large number of inodes per block group, all of
the metadata blocks in a flex_bg may be larger than what can fit in a
single block group.  Unfortunately, ext4_alloc_group_tables() in
resize.c was never tested to see if it would handle this case
correctly, and there were a large number of bugs which caused the
following sequence to result in a BUG_ON:

kernel bug at fs/ext4/resize.c:409!
   ...
call trace:
 [<ffffffff81256768>] ext4_flex_group_add+0x1448/0x1830
 [<ffffffff81257de2>] ext4_resize_fs+0x7b2/0xe80
 [<ffffffff8123ac50>] ext4_ioctl+0xbf0/0xf00
 [<ffffffff811c111d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811b9df2>] ? final_putname+0x22/0x50
 [<ffffffff811c1371>] sys_ioctl+0x81/0xa0
 [<ffffffff81676aa9>] system_call_fastpath+0x16/0x1b
code: c8 4c 89 df e8 41 96 f8 ff 44 89 e8 49 01 c4 44 29 6d d4 0
rip  [<ffffffff81254fa1>] set_flexbg_block_bitmap+0x171/0x180


This can be reproduced with the following command sequence:

   mke2fs -t ext4 -i 4096 /dev/vdd 1G
   mount -t ext4 /dev/vdd /vdd
   resize2fs /dev/vdd 8G

To fix this, we need to make sure the right thing happens when a block
group's inode table straddles two block groups, which means the
following bugs had to be fixed:

1) Not clearing the BLOCK_UNINIT flag in the second block group in
   ext4_alloc_group_tables --- the was proximate cause of the BUG_ON.

2) Incorrectly determining how many block groups contained contiguous
   free blocks in ext4_alloc_group_tables().

3) Incorrectly setting the start of the next block range to be marked
   in use after a discontinuity in setup_new_flex_group_blocks().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 20 insertions, 12 deletions

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index c5adbb318a90..69a62610a6ca 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -243,6 +243,7 @@ static int ext4_alloc_group_tables(struct super_block *sb,
         ext4_group_t group;
         ext4_group_t last_group;
         unsigned overhead;
+        __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
 
         BUG_ON(flex_gd->count == 0 || group_data == NULL);
 
@@ -266,7 +267,7 @@ next_group:
         src_group++;
         for (; src_group <= last_group; src_group++) {
                 overhead = ext4_group_overhead_blocks(sb, src_group);
-                if (overhead != 0)
+                if (overhead == 0)
                         last_blk += group_data[src_group - group].blocks_count;
                 else
                         break;
@@ -280,8 +281,7 @@ next_group:
                 group = ext4_get_group_number(sb, start_blk - 1);
                 group -= group_data[0].group;
                 group_data[group].free_blocks_count--;
-                if (flexbg_size > 1)
-                        flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
+                flex_gd->bg_flags[group] &= uninit_mask;
         }
 
         /* Allocate inode bitmaps */
@@ -292,22 +292,30 @@ next_group:
                 group = ext4_get_group_number(sb, start_blk - 1);
                 group -= group_data[0].group;
                 group_data[group].free_blocks_count--;
-                if (flexbg_size > 1)
-                        flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
+                flex_gd->bg_flags[group] &= uninit_mask;
         }
 
         /* Allocate inode tables */
         for (; it_index < flex_gd->count; it_index++) {
-                if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk)
+                unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
+                ext4_fsblk_t next_group_start;
+
+                if (start_blk + itb > last_blk)
                         goto next_group;
                 group_data[it_index].inode_table = start_blk;
-                group = ext4_get_group_number(sb, start_blk - 1);
+                group = ext4_get_group_number(sb, start_blk);
+                next_group_start = ext4_group_first_block_no(sb, group + 1);
                 group -= group_data[0].group;
-                group_data[group].free_blocks_count -=
-                                        EXT4_SB(sb)->s_itb_per_group;
-                if (flexbg_size > 1)
-                        flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
 
+                if (start_blk + itb > next_group_start) {
+                        flex_gd->bg_flags[group + 1] &= uninit_mask;
+                        overhead = start_blk + itb - next_group_start;
+                        group_data[group + 1].free_blocks_count -= overhead;
+                        itb -= overhead;
+                }
+
+                group_data[group].free_blocks_count -= itb;
+                flex_gd->bg_flags[group] &= uninit_mask;
                 start_blk += EXT4_SB(sb)->s_itb_per_group;
         }
 
@@ -620,7 +628,7 @@ handle_ib:
                         if (err)
                                 goto out;
                         count = group_table_count[j];
-                        start = group_data[i].block_bitmap;
+                        start = (&group_data[i].block_bitmap)[j];
                         block = start;
                 }