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ext4: Add support for 48 bit inode i_blocks.
Use the __le16 l_i_reserved1 field of the linux2 struct of ext4_inode to represet the higher 16 bits for i_blocks. With this change max_file size becomes (2**48 -1 )* 512 bytes. We add a RO_COMPAT feature to the super block to indicate that inode have i_blocks represented as a split 48 bits. Super block with this feature set cannot be mounted read write on a kernel with CONFIG_LSF disabled. Super block flag EXT4_FEATURE_RO_COMPAT_HUGE_FILE Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V
Theodore Ts'o
parent
a48380f769
commit
0fc1b45147
@ -2667,6 +2667,22 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei)
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if (flags & S_DIRSYNC)
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ei->i_flags |= EXT4_DIRSYNC_FL;
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}
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static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
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struct ext4_inode_info *ei)
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{
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blkcnt_t i_blocks ;
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struct super_block *sb = ei->vfs_inode.i_sb;
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if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
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/* we are using combined 48 bit field */
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i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 |
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le32_to_cpu(raw_inode->i_blocks_lo);
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return i_blocks;
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} else {
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return le32_to_cpu(raw_inode->i_blocks_lo);
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}
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}
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void ext4_read_inode(struct inode * inode)
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{
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@ -2715,8 +2731,8 @@ void ext4_read_inode(struct inode * inode)
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* recovery code: that's fine, we're about to complete
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* the process of deleting those. */
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}
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inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
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ei->i_flags = le32_to_cpu(raw_inode->i_flags);
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inode->i_blocks = ext4_inode_blocks(raw_inode, ei);
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ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo);
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if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
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cpu_to_le32(EXT4_OS_HURD)) {
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@ -2799,6 +2815,43 @@ void ext4_read_inode(struct inode * inode)
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return;
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}
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static int ext4_inode_blocks_set(handle_t *handle,
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struct ext4_inode *raw_inode,
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struct ext4_inode_info *ei)
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{
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struct inode *inode = &(ei->vfs_inode);
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u64 i_blocks = inode->i_blocks;
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struct super_block *sb = inode->i_sb;
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int err = 0;
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if (i_blocks <= ~0U) {
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/*
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* i_blocks can be represnted in a 32 bit variable
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* as multiple of 512 bytes
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*/
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raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks);
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raw_inode->i_blocks_high = 0;
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} else if (i_blocks <= 0xffffffffffffULL) {
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/*
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* i_blocks can be represented in a 48 bit variable
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* as multiple of 512 bytes
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*/
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err = ext4_update_rocompat_feature(handle, sb,
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
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if (err)
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goto err_out;
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/* i_block is stored in the split 48 bit fields */
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raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks);
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raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
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} else {
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ext4_error(sb, __FUNCTION__,
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"Wrong inode i_blocks count %llu\n",
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(unsigned long long)inode->i_blocks);
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}
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err_out:
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return err;
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}
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/*
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* Post the struct inode info into an on-disk inode location in the
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* buffer-cache. This gobbles the caller's reference to the
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@ -2853,7 +2906,8 @@ static int ext4_do_update_inode(handle_t *handle,
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EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode);
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EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode);
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raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
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if (ext4_inode_blocks_set(handle, raw_inode, ei))
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goto out_brelse;
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raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
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raw_inode->i_flags = cpu_to_le32(ei->i_flags);
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if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
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@ -1603,17 +1603,50 @@ static void ext4_orphan_cleanup (struct super_block * sb,
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/*
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* Maximal file size. There is a direct, and {,double-,triple-}indirect
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* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
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* We need to be 1 filesystem block less than the 2^32 sector limit.
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* block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
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* We need to be 1 filesystem block less than the 2^48 sector limit.
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*/
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static loff_t ext4_max_size(int bits)
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{
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loff_t res = EXT4_NDIR_BLOCKS;
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/* This constant is calculated to be the largest file size for a
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* dense, 4k-blocksize file such that the total number of
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int meta_blocks;
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loff_t upper_limit;
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/* This is calculated to be the largest file size for a
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* dense, file such that the total number of
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* sectors in the file, including data and all indirect blocks,
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* does not exceed 2^32. */
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const loff_t upper_limit = 0x1ff7fffd000LL;
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* does not exceed 2^48 -1
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* __u32 i_blocks_lo and _u16 i_blocks_high representing the
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* total number of 512 bytes blocks of the file
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*/
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if (sizeof(blkcnt_t) < sizeof(u64)) {
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/*
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* CONFIG_LSF is not enabled implies the inode
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* i_block represent total blocks in 512 bytes
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* 32 == size of vfs inode i_blocks * 8
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*/
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upper_limit = (1LL << 32) - 1;
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/* total blocks in file system block size */
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upper_limit >>= (bits - 9);
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} else {
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/* We use 48 bit ext4_inode i_blocks */
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upper_limit = (1LL << 48) - 1;
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/* total blocks in file system block size */
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upper_limit >>= (bits - 9);
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}
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/* indirect blocks */
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meta_blocks = 1;
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/* double indirect blocks */
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meta_blocks += 1 + (1LL << (bits-2));
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/* tripple indirect blocks */
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meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
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upper_limit -= meta_blocks;
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upper_limit <<= bits;
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res += 1LL << (bits-2);
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res += 1LL << (2*(bits-2));
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@ -1621,6 +1654,10 @@ static loff_t ext4_max_size(int bits)
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res <<= bits;
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if (res > upper_limit)
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res = upper_limit;
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if (res > MAX_LFS_FILESIZE)
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res = MAX_LFS_FILESIZE;
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return res;
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}
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@ -1789,6 +1826,19 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
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sb->s_id, le32_to_cpu(features));
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goto failed_mount;
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}
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if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
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/*
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* Large file size enabled file system can only be
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* mount if kernel is build with CONFIG_LSF
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*/
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if (sizeof(root->i_blocks) < sizeof(u64) &&
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!(sb->s_flags & MS_RDONLY)) {
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printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
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"files cannot be mounted read-write "
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"without CONFIG_LSF.\n", sb->s_id);
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goto failed_mount;
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}
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}
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blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
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if (blocksize < EXT4_MIN_BLOCK_SIZE ||
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@ -282,7 +282,7 @@ struct ext4_inode {
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__le32 i_dtime; /* Deletion Time */
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__le16 i_gid; /* Low 16 bits of Group Id */
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__le16 i_links_count; /* Links count */
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__le32 i_blocks; /* Blocks count */
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__le32 i_blocks_lo; /* Blocks count */
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__le32 i_flags; /* File flags */
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union {
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struct {
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@ -302,7 +302,7 @@ struct ext4_inode {
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__le32 i_obso_faddr; /* Obsoleted fragment address */
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union {
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struct {
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__le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
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__le16 l_i_blocks_high; /* were l_i_reserved1 */
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__le16 l_i_file_acl_high;
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__le16 l_i_uid_high; /* these 2 fields */
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__le16 l_i_gid_high; /* were reserved2[0] */
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@ -404,6 +404,7 @@ do { \
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#if defined(__KERNEL__) || defined(__linux__)
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#define i_reserved1 osd1.linux1.l_i_reserved1
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#define i_file_acl_high osd2.linux2.l_i_file_acl_high
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#define i_blocks_high osd2.linux2.l_i_blocks_high
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#define i_uid_low i_uid
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#define i_gid_low i_gid
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#define i_uid_high osd2.linux2.l_i_uid_high
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@ -670,6 +671,7 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
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#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
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#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
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#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
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#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
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#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
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#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
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#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
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@ -681,6 +683,7 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
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#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
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#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
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#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
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#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
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#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
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#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
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@ -695,7 +698,8 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
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EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
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EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
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EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
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EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
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EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
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/*
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* Default values for user and/or group using reserved blocks
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