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SubjectRe: fsync on large files
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>    in <linux/list.h> (as opposed to the braindamaged BSD compatibility macros
> in <linux/lists.h>), and it's fairly trivial to just keep each dirty block
> on two dirty lists (one inode-specific, one global - you'd still use the
> global one for normal write-outs).
>
> This works for ext2, but it doesn't work with filesystems (most notably
> FAT filesystems, and possibly some B-tree based filesystems) where
> metadata might be shared by multiple files, so a block might have to be
> on multiple inode dirty lists. I had thought about using a linked list
> architecture and threading buffer_head structures onto inode dirty
> linked lists, but I discarded that plan since it wouldn't work for all
> filesystems.

As a percentage the number of 'shared blocks' is low. So just keep a single
'might be shared list' and write that list out too.

Alan


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