ext4: Support large files

This patch converts ext4_inode i_blocks to represent total
blocks occupied by the inode in file system block size.
Earlier the variable used to represent this in 512 byte
block size. This actually limited the total size of the file.

The feature is enabled transparently when we write an inode
whose i_blocks cannot be represnted as 512 byte units in a
48 bit variable.

inode flag  EXT4_HUGE_FILE_FL

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

2 files changed, 31 insertions, 10 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bb89fe727bb1..9cf85721d83c 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2671,14 +2671,20 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
                                         struct ext4_inode_info *ei)
 {
         blkcnt_t i_blocks ;
-        struct super_block *sb = ei->vfs_inode.i_sb;
+        struct inode *inode = &(ei->vfs_inode);
+        struct super_block *sb = inode->i_sb;
 
         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
                                 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
                 /* we are using combined 48 bit field */
                 i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 |
                                         le32_to_cpu(raw_inode->i_blocks_lo);
-                return i_blocks;
+                if (ei->i_flags & EXT4_HUGE_FILE_FL) {
+                        /* i_blocks represent file system block size */
+                        return i_blocks  << (inode->i_blkbits - 9);
+                } else {
+                        return i_blocks;
+                }
         } else {
                 return le32_to_cpu(raw_inode->i_blocks_lo);
         }
@@ -2829,8 +2835,9 @@ static int ext4_inode_blocks_set(handle_t *handle,
                  * i_blocks can be represnted in a 32 bit variable
                  * as multiple of 512 bytes
                  */
-                raw_inode->i_blocks_lo   = cpu_to_le32((u32)i_blocks);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
                 raw_inode->i_blocks_high = 0;
+                ei->i_flags &= ~EXT4_HUGE_FILE_FL;
         } else if (i_blocks <= 0xffffffffffffULL) {
                 /*
                  * i_blocks can be represented in a 48 bit variable
@@ -2841,12 +2848,23 @@ static int ext4_inode_blocks_set(handle_t *handle,
                 if (err)
                         goto  err_out;
                 /* i_block is stored in the split  48 bit fields */
-                raw_inode->i_blocks_lo   = cpu_to_le32((u32)i_blocks);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
                 raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
+                ei->i_flags &= ~EXT4_HUGE_FILE_FL;
         } else {
-                ext4_error(sb, __FUNCTION__,
-                                "Wrong inode i_blocks count  %llu\n",
-                                (unsigned long long)inode->i_blocks);
+                /*
+                 * i_blocks should be represented in a 48 bit variable
+                 * as multiple of  file system block size
+                 */
+                err = ext4_update_rocompat_feature(handle, sb,
+                                            EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+                if (err)
+                        goto  err_out;
+                ei->i_flags |= EXT4_HUGE_FILE_FL;
+                /* i_block is stored in file system block size */
+                i_blocks = i_blocks >> (inode->i_blkbits - 9);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
+                raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
         }
 err_out:
         return err;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2b9dc96ec43e..64067de70c6f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1631,11 +1631,14 @@ static loff_t ext4_max_size(int bits)
                 upper_limit >>= (bits - 9);
 
         } else {
-                /* We use 48 bit ext4_inode i_blocks */
+                /*
+                 * We use 48 bit ext4_inode i_blocks
+                 * With EXT4_HUGE_FILE_FL set the i_blocks
+                 * represent total number of blocks in
+                 * file system block size
+                 */
                 upper_limit = (1LL << 48) - 1;
 
-                /* total blocks in file system block size */
-                upper_limit >>= (bits - 9);
         }
 
         /* indirect blocks */