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    Subject[RFC 2/2] JBD: blocks reservation fix for large block support
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    The blocks per page could be less or quals to 1 with the large block support in VM.
    The patch fixed the way to calculate the number of blocks to reserve in journal in the
    case blocksize > pagesize.



    Signed-off-by: Mingming Cao <cmm@us.ibm.com>

    Index: my2.6/fs/jbd/journal.c
    ===================================================================
    --- my2.6.orig/fs/jbd/journal.c 2007-08-31 13:27:16.000000000 -0700
    +++ my2.6/fs/jbd/journal.c 2007-08-31 13:28:18.000000000 -0700
    @@ -1611,7 +1611,12 @@ void journal_ack_err(journal_t *journal)

    int journal_blocks_per_page(struct inode *inode)
    {
    - return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
    + int bits = PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits;
    +
    + if (bits > 0)
    + return 1 << bits;
    + else
    + return 1;
    }

    /*
    Index: my2.6/fs/jbd2/journal.c
    ===================================================================
    --- my2.6.orig/fs/jbd2/journal.c 2007-08-31 13:32:21.000000000 -0700
    +++ my2.6/fs/jbd2/journal.c 2007-08-31 13:32:30.000000000 -0700
    @@ -1612,7 +1612,12 @@ void jbd2_journal_ack_err(journal_t *jou

    int jbd2_journal_blocks_per_page(struct inode *inode)
    {
    - return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
    + int bits = PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits;
    +
    + if (bits > 0)
    + return 1 << bits;
    + else
    + return 1;
    }

    /*

    -
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