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    SubjectRe: [PATCH 1/3] bdi: Use parent filesystem BDI for inodes not capable of writeback
    Given that we only need the per-mapping one for the bdev fs what about

    * Return the writeback-relevant backing device for this inode.
    * For a normal filesystem this must always be the bdi hanging off the
    * superblock, given that we only expect one bdi per filesystems in
    * the per-superblock sync functions. But the block device special
    * filesystem requires a quick given that it contains the internal
    * I/O inodes for block devices on a single superblock. This works
    * because the block deevice filesystem inodes are never user visible
    * and we will never do a per-superblock sync on it.
    static struct backing_dev_info *inode_to_bdi(struct inode *inode)
    if (inode->i_sb == blockdev_superblock)
    return inode->i_mapping->backing_dev_info;
    return inode->i_sb->s_bdi;

    that also avoids the need for doing the bdi capabilities audit ASAP.

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      Last update: 2010-07-29 10:15    [W:0.019 / U:11.856 seconds]
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