diff options
| -rw-r--r-- | fs/ext4/balloc.c | 33 | ||||
| -rw-r--r-- | fs/ext4/ext4.h | 4 |
2 files changed, 22 insertions, 15 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 5c56785007e0..a4950e91f61c 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -708,16 +708,6 @@ static inline int test_root(ext4_group_t a, int b) } } -static int ext4_group_sparse(ext4_group_t group) -{ - if (group <= 1) - return 1; - if (!(group & 1)) - return 0; - return (test_root(group, 7) || test_root(group, 5) || - test_root(group, 3)); -} - /** * ext4_bg_has_super - number of blocks used by the superblock in group * @sb: superblock for filesystem @@ -728,11 +718,26 @@ static int ext4_group_sparse(ext4_group_t group) */ int ext4_bg_has_super(struct super_block *sb, ext4_group_t group) { - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, - EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) && - !ext4_group_sparse(group)) + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + if (group == 0) + return 1; + if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_SPARSE_SUPER2)) { + if (group == le32_to_cpu(es->s_backup_bgs[0]) || + group == le32_to_cpu(es->s_backup_bgs[1])) + return 1; + return 0; + } + if ((group <= 1) || !EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) + return 1; + if (!(group & 1)) return 0; - return 1; + if (test_root(group, 3) || (test_root(group, 5)) || + test_root(group, 7)) + return 1; + + return 0; } static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb, diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index aeda5061a59a..4feb2d5819ae 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1160,7 +1160,8 @@ struct ext4_super_block { __le32 s_usr_quota_inum; /* inode for tracking user quota */ __le32 s_grp_quota_inum; /* inode for tracking group quota */ __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ - __le32 s_reserved[108]; /* Padding to the end of the block */ + __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ + __le32 s_reserved[106]; /* Padding to the end of the block */ __le32 s_checksum; /* crc32c(superblock) */ }; @@ -1506,6 +1507,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 +#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |