ext4: Add inode version support in ext4

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.
This field is incremented in case the ext4_inode is large enough. A
i_version mount option has been added to enable the feature.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@bull.net>

1 files changed, 17 insertions, 1 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 89cd35386ff5..a06a3b7cfc34 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2781,6 +2781,13 @@ void ext4_read_inode(struct inode * inode)
         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;
@@ -2963,8 +2970,14 @@ static int ext4_do_update_inode(handle_t *handle,
         } 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);
@@ -3191,6 +3204,9 @@ int ext4_mark_iloc_dirty(handle_t *handle,
 {
         int err = 0;
 
+        if (test_opt(inode->i_sb, I_VERSION))
+                inode_inc_iversion(inode);
+
         /* the do_update_inode consumes one bh->b_count */
         get_bh(iloc->bh);