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>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bb89fe7..9cf8572 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2671,14 +2671,20 @@
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 @@
* 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 @@
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;