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    SubjectRe: [PATCH] fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers
    > -int blkdev_fsync(struct file *filp, int datasync)
    > +int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
    > {
    > struct inode *bd_inode = filp->f_mapping->host;
    > struct block_device *bdev = I_BDEV(bd_inode);
    > @@ -389,14 +389,10 @@ int blkdev_fsync(struct file *filp, int datasync)
    > * i_mutex and doing so causes performance issues with concurrent
    > * O_SYNC writers to a block device.
    > */
    > - mutex_unlock(&bd_inode->i_mutex);
    > -

    Now that i_mutex on entry isn't held the comment above can be removed.



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