linux-ext4 - When to set EXT4_FEATURE_RO_COMPAT_LARGE

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Message-ID: <470E578D.4040308@linux.vnet.ibm.com>
Date:	Thu, 11 Oct 2007 22:34:13 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Theodore Tso <tytso@....edu>,
	Andreas Dilger <adilger@...sterfs.com>,
	Mingming Cao <cmm@...ibm.com>
Subject: When to set EXT4_FEATURE_RO_COMPAT_LARGE_FILE  ?

Right now we do this  in ext4_do_update_inode

 if (ei->i_disksize > 0x7fffffffULL) {

.....
.....

EXT4_SET_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_LARGE_FILE);

That is if i_disksize is greater that 2**31 -1  we set the flag

But in ext4_inode the size of i_size is 32 bits

__le32  i_size;         /* Size in bytes */

That means it should be able to store ffffffffULL.

Why did we decided to enable the EXT4_FEATURE_RO_COMPAT_LARGE_FILE when we cross 2**31 -1 ?

NOTE: With EXT4_FEATURE_RO_COMPAT_LARGE_FILE we store the higer order 32 bits of i_size in i_dir_acl.


-aneesh
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