3 files changed, 47 insertions, 0 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 0762d143e252..fca382037ddd 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -194,7 +194,16 @@ static void ext4_init_block_bitmap(struct super_block *sb,
         if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
                 ext4_error(sb, "Checksum bad for group %u", block_group);
                 grp = ext4_get_group_info(sb, block_group);
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           grp->bb_free);
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
+                if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+                        int count;
+                        count = ext4_free_inodes_count(sb, gdp);
+                        percpu_counter_sub(&sbi->s_freeinodes_counter,
+                                           count);
+                }
                 set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
                 return;
         }
@@ -359,6 +368,7 @@ static void ext4_validate_block_bitmap(struct super_block *sb,
 {
         ext4_fsblk_t    blk;
         struct ext4_group_info *grp = ext4_get_group_info(sb, block_group);
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
 
         if (buffer_verified(bh))
                 return;
@@ -369,6 +379,9 @@ static void ext4_validate_block_bitmap(struct super_block *sb,
                 ext4_unlock_group(sb, block_group);
                 ext4_error(sb, "bg %u: block %llu: invalid block bitmap",
                            block_group, blk);
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           grp->bb_free);
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
                 return;
         }
@@ -376,6 +389,9 @@ static void ext4_validate_block_bitmap(struct super_block *sb,
                         desc, bh))) {
                 ext4_unlock_group(sb, block_group);
                 ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           grp->bb_free);
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
                 return;
         }
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 0ee59a6644e2..a87455df38bc 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -71,6 +71,7 @@ static unsigned ext4_init_inode_bitmap(struct super_block *sb,
                                        struct ext4_group_desc *gdp)
 {
         struct ext4_group_info *grp;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
         J_ASSERT_BH(bh, buffer_locked(bh));
 
         /* If checksum is bad mark all blocks and inodes use to prevent
@@ -78,7 +79,16 @@ static unsigned ext4_init_inode_bitmap(struct super_block *sb,
         if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
                 ext4_error(sb, "Checksum bad for group %u", block_group);
                 grp = ext4_get_group_info(sb, block_group);
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           grp->bb_free);
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
+                if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+                        int count;
+                        count = ext4_free_inodes_count(sb, gdp);
+                        percpu_counter_sub(&sbi->s_freeinodes_counter,
+                                           count);
+                }
                 set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
                 return 0;
         }
@@ -116,6 +126,7 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
         struct buffer_head *bh = NULL;
         ext4_fsblk_t bitmap_blk;
         struct ext4_group_info *grp;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
 
         desc = ext4_get_group_desc(sb, block_group, NULL);
         if (!desc)
@@ -185,6 +196,12 @@ verify:
                 ext4_error(sb, "Corrupt inode bitmap - block_group = %u, "
                            "inode_bitmap = %llu", block_group, bitmap_blk);
                 grp = ext4_get_group_info(sb, block_group);
+                if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+                        int count;
+                        count = ext4_free_inodes_count(sb, desc);
+                        percpu_counter_sub(&sbi->s_freeinodes_counter,
+                                           count);
+                }
                 set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
                 return NULL;
         }
@@ -321,6 +338,12 @@ out:
                         fatal = err;
         } else {
                 ext4_error(sb, "bit already cleared for inode %lu", ino);
+                if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+                        int count;
+                        count = ext4_free_inodes_count(sb, gdp);
+                        percpu_counter_sub(&sbi->s_freeinodes_counter,
+                                           count);
+                }
                 set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
         }
 
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 59e31622cc6e..7f72f50a8fa7 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -722,6 +722,7 @@ void ext4_mb_generate_buddy(struct super_block *sb,
                                 void *buddy, void *bitmap, ext4_group_t group)
 {
         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
         ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
         ext4_grpblk_t i = 0;
         ext4_grpblk_t first;
@@ -759,6 +760,9 @@ void ext4_mb_generate_buddy(struct super_block *sb,
                  * corrupt and update bb_free using bitmap value
                  */
                 grp->bb_free = free;
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           grp->bb_free);
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
         }
         mb_set_largest_free_order(sb, grp);
@@ -1431,6 +1435,7 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                 right_is_free = !mb_test_bit(last + 1, e4b->bd_bitmap);
 
         if (unlikely(block != -1)) {
+                struct ext4_sb_info *sbi = EXT4_SB(sb);
                 ext4_fsblk_t blocknr;
 
                 blocknr = ext4_group_first_block_no(sb, e4b->bd_group);
@@ -1441,6 +1446,9 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                                       "freeing already freed block "
                                       "(bit %u); block bitmap corrupt.",
                                       block);
+                if (!EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))
+                        percpu_counter_sub(&sbi->s_freeclusters_counter,
+                                           e4b->bd_info->bb_free);
                 /* Mark the block group as corrupt. */
                 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
                         &e4b->bd_info->bb_state);