Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=902be4c5efe0289594c3acf43da40fe7ff0a138b
Commit:     902be4c5efe0289594c3acf43da40fe7ff0a138b
Parent:     e2b4657453c0d5571bd3c7256585c486ed42d364
Author:     Aneesh Kumar K.V <[EMAIL PROTECTED]>
AuthorDate: Mon Jan 28 23:58:26 2008 -0500
Committer:  Theodore Ts'o <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 23:58:26 2008 -0500

    ext2: Fix the max file size for ext2 file system.
    
    The max file size for ext2 file system is now calculated
    with hardcoded 4K block size. The patch fixes it to be
    calculated with the right block size.
    
    Signed-off-by: Aneesh Kumar K.V <[EMAIL PROTECTED]>
---
 fs/ext2/super.c |   32 ++++++++++++++++++++++++++++----
 1 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 154e25f..6abaf75 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -680,11 +680,31 @@ static int ext2_check_descriptors (struct super_block * 
sb)
 static loff_t ext2_max_size(int bits)
 {
        loff_t res = EXT2_NDIR_BLOCKS;
-       /* This constant is calculated to be the largest file size for a
-        * dense, 4k-blocksize file such that the total number of
+       int meta_blocks;
+       loff_t upper_limit;
+
+       /* This is calculated to be the largest file size for a
+        * dense, file such that the total number of
         * sectors in the file, including data and all indirect blocks,
-        * does not exceed 2^32. */
-       const loff_t upper_limit = 0x1ff7fffd000LL;
+        * does not exceed 2^32 -1
+        * __u32 i_blocks representing the total number of
+        * 512 bytes blocks of the file
+        */
+       upper_limit = (1LL << 32) - 1;
+
+       /* total blocks in file system block size */
+       upper_limit >>= (bits - 9);
+
+
+       /* indirect blocks */
+       meta_blocks = 1;
+       /* double indirect blocks */
+       meta_blocks += 1 + (1LL << (bits-2));
+       /* tripple indirect blocks */
+       meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
+
+       upper_limit -= meta_blocks;
+       upper_limit <<= bits;
 
        res += 1LL << (bits-2);
        res += 1LL << (2*(bits-2));
@@ -692,6 +712,10 @@ static loff_t ext2_max_size(int bits)
        res <<= bits;
        if (res > upper_limit)
                res = upper_limit;
+
+       if (res > MAX_LFS_FILESIZE)
+               res = MAX_LFS_FILESIZE;
+
        return res;
 }
 
-
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