The efficient sparse file read and fadvise support might be nice too, but I'd like to see numbers for how they improve matters before I feel comfortable saying yea or nay to adding those specific features.
Instead of '...but I'd like to see...' I assume you meant, '...since I'd like to see...', as it would be hard to see how they improve matters without actually implementing them.
Although for sparse file reads, I think the low overhead design to avoid bloating every file upon read in NFSv4.2 makes it easy to see the benefit without any implementation. For ioadvise, I think the benefit will be dependent upon support from the exported file system (or possibly nfs server). So any prototype would have to be combined with appropriate support in the server file system or nfs server.
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