ext4: decrement free clusters/inodes counters when block group declared bad

We should decrement free clusters counter when block bitmap is marked
as corrupt and free inodes counter when the allocation bitmap is
marked as corrupt to avoid misunderstanding due to incorrect available
size in statfs result.  User can get immediately ENOSPC error from
write begin without reaching for the writepages.

Cc: Darrick J. Wong<darrick.wong@oracle.com>
Reported-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 0762d143e252439e7061a9e6ac074a49c69fbe46..fca382037ddd9eef2ded6383f0ff1061b435d0b6 100644 (file)
--- 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 0ee59a6644e211b752480364c95e5616ab9e92fd..a87455df38bca3e743d603709a208e7da77b61fe 100644 (file)
--- 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 59e31622cc6ef41cdd8474d47e43e1e634da676a..7f72f50a8fa764e80a91cfaea969297f65a8b615 100644 (file)
--- 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);