ext4: Add 64-bit inode version support to ext4 From: Kalpak Shah This patch adds 64-bit inode version support to ext4. The lower 32 bits are stored in the osd1.linux1.l_i_version field while the high 32 bits are stored in the i_version_hi field newly created in the ext4_inode. Signed-off-by: Kalpak Shah Signed-off-by: Mingming Cao Signed-off-by: Andreas Dilger Signed-off-by: Aneesh Kumar K.V --- fs/ext4/inode.c | 14 +++++++++++++- include/linux/ext4_fs.h | 4 +++- 2 files changed, 16 insertions(+), 2 deletions(-) Index: linux-2.6.23-rc5/fs/ext4/inode.c =================================================================== --- linux-2.6.23-rc5.orig/fs/ext4/inode.c 2007-09-12 16:23:32.000000000 -0700 +++ linux-2.6.23-rc5/fs/ext4/inode.c 2007-09-12 16:49:55.000000000 -0700 @@ -2704,6 +2704,13 @@ void ext4_read_inode(struct inode * inod EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); + inode->i_version = le32_to_cpu(raw_inode->i_disk_version); + if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { + if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) + inode->i_version |= + (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; + } + if (S_ISREG(inode->i_mode)) { inode->i_op = &ext4_file_inode_operations; inode->i_fop = &ext4_file_operations; @@ -2847,8 +2854,13 @@ static int ext4_do_update_inode(handle_t } else for (block = 0; block < EXT4_N_BLOCKS; block++) raw_inode->i_block[block] = ei->i_data[block]; - if (ei->i_extra_isize) + raw_inode->i_disk_version = cpu_to_le32(inode->i_version); + if (ei->i_extra_isize) { + if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) + raw_inode->i_version_hi = + cpu_to_le32(inode->i_version >> 32); raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); + } BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata"); rc = ext4_journal_dirty_metadata(handle, bh); Index: linux-2.6.23-rc5/include/linux/ext4_fs.h =================================================================== --- linux-2.6.23-rc5.orig/include/linux/ext4_fs.h 2007-09-12 16:49:03.000000000 -0700 +++ linux-2.6.23-rc5/include/linux/ext4_fs.h 2007-09-12 16:49:23.000000000 -0700 @@ -304,7 +304,7 @@ struct ext4_inode { __le32 i_flags; /* File flags */ union { struct { - __u32 l_i_reserved1; + __le32 l_i_version; } linux1; struct { __u32 h_i_translator; @@ -424,6 +424,8 @@ do { \ raw_inode->xtime ## _extra); \ } while (0) +#define i_disk_version osd1.linux1.l_i_version + #if defined(__KERNEL__) || defined(__linux__) #define i_reserved1 osd1.linux1.l_i_reserved1 #define i_frag osd2.linux2.l_i_frag