[patch 0/2][RFC] vfs: artefact(?) in rw_verify_area

[Edward Shishkin]

Hello everyone.

rw_verify_area() contains a limitation, which means inability
to write more then INT_MAX bytes atomically. This tends
to be a disadvantage since INT_MAX doesn't look like a huge
value nowadays. Moreover, this restriction looks too artificial.

I have increased the limit up to rounded down SSIZE_MAX
(patch 2) and got an overflow in the direct-io subsystem.
However, after fixing the overflow (patch 1), ext3,4 work
fine for me so far.

Any ideas, if there are other subsystems that expose the
INT_MAX limitation?

Thanks in advance,

--
Edward O. Shishkin
Principal Software Engineer
Red Hat Czech

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