[simoncion]

FSs designed to run on dumb flash exist: https://encrypted.google.com/#q=site:lwn.net+nand+flash+file...

> I don't see why people try to design filesystems that do everything.

For general use, [0] I would rather use a FS that works on pretty much every media type [1] -and has reasonable perf- than to have to worry about whether $SPECIALTY_FS is actually tuned for $WEIRDO_BLOCK_DEVICE, or if I've failed to understand the particulars of either the FS, device, or both.

[0] That is, when getting the absolute best perf isn't a requirement.

[1] Except for like, tape, and optical RAM/WORM drives, natch.

[TheLoneWolfling]

I don't mind having a filesystem that works reasonably well on most devices. But I would consider "being able to append to a file reasonably quickly" as part of that "reasonably well".

Note that it's entirely possible to have a filesystem that's actually several different filesystems with a magic selector. (I mean, block sizes and reserved block percentages and inline inodes already are along those lines)

[simoncion]

If your underlying device is slow -as SD cards are notorious for being for any use case other than picture or video storage and retrieval-, no amount of FS juju can help you.