diff options
| -rw-r--r-- | fs/ext4/balloc.c | 6 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 8 | ||||
| -rw-r--r-- | fs/ext4/super.c | 18 | ||||
| -rw-r--r-- | include/linux/ext4_fs.h | 9 | ||||
| -rw-r--r-- | include/linux/ext4_fs_sb.h | 1 |
5 files changed, 31 insertions, 11 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index df77ea891f2..3dacb124b8c 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -74,10 +74,12 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, return NULL; } - desc = (struct ext4_group_desc *) sbi->s_group_desc[group_desc]->b_data; + desc = (struct ext4_group_desc *)( + (__u8 *)sbi->s_group_desc[group_desc]->b_data + + offset * EXT4_DESC_SIZE(sb)); if (bh) *bh = sbi->s_group_desc[group_desc]; - return desc + offset; + return desc; } /** diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index c05dc57148b..d03e7d85a63 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2432,14 +2432,16 @@ static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb, return 0; } - gdp = (struct ext4_group_desc *)bh->b_data; + gdp = (struct ext4_group_desc *)((__u8 *)bh->b_data + + desc * EXT4_DESC_SIZE(sb)); /* * Figure out the offset within the block group inode table */ offset = ((ino - 1) % EXT4_INODES_PER_GROUP(sb)) * EXT4_INODE_SIZE(sb); - block = ext4_inode_table(gdp + desc) + - (offset >> EXT4_BLOCK_SIZE_BITS(sb)); + block = ext4_inode_table(gdp) + (offset >> EXT4_BLOCK_SIZE_BITS(sb)); + + iloc->block_group = block_group; iloc->offset = offset & (EXT4_BLOCK_SIZE(sb) - 1); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d844175e60e..bc8848bff2f 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1268,7 +1268,8 @@ static int ext4_check_descriptors (struct super_block * sb) return 0; } first_block += EXT4_BLOCKS_PER_GROUP(sb); - gdp++; + gdp = (struct ext4_group_desc *) + ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); } ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); @@ -1619,7 +1620,18 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) sbi->s_frag_size, blocksize); goto failed_mount; } - sbi->s_frags_per_block = 1; + sbi->s_desc_size = le16_to_cpu(es->s_desc_size); + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { + if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE || + sbi->s_desc_size > EXT4_MAX_DESC_SIZE || + sbi->s_desc_size & (sbi->s_desc_size - 1)) { + printk(KERN_ERR + "EXT4-fs: unsupported descriptor size %ld\n", + sbi->s_desc_size); + goto failed_mount; + } + } else + sbi->s_desc_size = EXT4_MIN_DESC_SIZE; sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); @@ -1630,7 +1642,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) goto cantfind_ext4; sbi->s_itb_per_group = sbi->s_inodes_per_group / sbi->s_inodes_per_block; - sbi->s_desc_per_block = blocksize / sizeof(struct ext4_group_desc); + sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); sbi->s_sbh = bh; sbi->s_mount_state = le16_to_cpu(es->s_state); sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h index 8e5009ee4ad..a3df2afc004 100644 --- a/include/linux/ext4_fs.h +++ b/include/linux/ext4_fs.h @@ -142,6 +142,9 @@ struct ext4_group_desc /* * Macro-instructions used to manage group descriptors */ +#define EXT4_MIN_DESC_SIZE 32 +#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE +#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) #ifdef __KERNEL__ # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) @@ -149,7 +152,7 @@ struct ext4_group_desc # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) #else # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) -# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (struct ext4_group_desc)) +# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) #endif @@ -474,7 +477,7 @@ struct ext4_super_block { * things it doesn't understand... */ __le32 s_first_ino; /* First non-reserved inode */ - __le16 s_inode_size; /* size of inode structure */ + __le16 s_inode_size; /* size of inode structure */ __le16 s_block_group_nr; /* block group # of this superblock */ __le32 s_feature_compat; /* compatible feature set */ /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ @@ -500,7 +503,7 @@ struct ext4_super_block { __le32 s_hash_seed[4]; /* HTREE hash seed */ __u8 s_def_hash_version; /* Default hash version to use */ __u8 s_reserved_char_pad; - __u16 s_reserved_word_pad; + __le16 s_desc_size; /* size of group descriptor */ /*100*/ __le32 s_default_mount_opts; __le32 s_first_meta_bg; /* First metablock block group */ __le32 s_mkfs_time; /* When the filesystem was created */ diff --git a/include/linux/ext4_fs_sb.h b/include/linux/ext4_fs_sb.h index ce7a844d670..691a713139c 100644 --- a/include/linux/ext4_fs_sb.h +++ b/include/linux/ext4_fs_sb.h @@ -29,6 +29,7 @@ */ struct ext4_sb_info { unsigned long s_frag_size; /* Size of a fragment in bytes */ + unsigned long s_desc_size; /* Size of a group descriptor in bytes */ unsigned long s_frags_per_block;/* Number of fragments per block */ unsigned long s_inodes_per_block;/* Number of inodes per block */ unsigned long s_frags_per_group;/* Number of fragments in a group */ |