tree 1c45252900c93ec85a206403888bdd7b26e9fb83
parent dbee2bf2f312a9d18fa3f305adc14e2ee58f65df
author Hugh Dickins <hugh@veritas.com> 1167942134 +0000
committer Greg Kroah-Hartman <gregkh@suse.de> 1172274592 -0800

fix msync error on unmapped area

Fix the 2.6.18 sys_msync to report -ENOMEM correctly when an unmapped area
falls within its range, and not to overshoot: to satisfy LSB 3.1 tests and
to fix Debian Bug#394392.  Took the 2.6.19 sys_msync as starting point
(including its cleanup of repeated "current->mm"s), reintroducing the
msync_interval and balance_dirty_pages_ratelimited_nr needed in 2.6.18.

The misbehaviour fixed here may not seem very serious; but it was enough
to mislead Debian into backporting 2.6.19's dirty page tracking patches,
with attendant mayhem when those resulted in unsuspected file corruption.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>