Enrik Berkhan 020fe22ff1 nommu: ramfs: pages allocated to an inode's pagecache may get wrongly discarded ... The pages attached to a ramfs inode's pagecache by truncation from nothing - as done by SYSV SHM for example - may get discarded under memory pressure. The problem is that the pages are not marked dirty. Anything that creates data in an MMU-based ramfs will cause the pages holding that data will cause the set_page_dirty() aop to be called. For the NOMMU-based mmap, set_page_dirty() may be called by write(), but it won't be called by page-writing faults on writable mmaps, and it isn't called by ramfs_nommu_expand_for_mapping() when a file is being truncated from nothing to allocate a contiguous run. The solution is to mark the pages dirty at the point of allocation by the truncation code. Signed-off-by: Enrik Berkhan <Enrik.Berkhan@ge.com> Signed-off-by: David Howells <dhowells@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-03-14 11:57:22 -07:00
..
file-mmu.c	ramfs: enable splice write	2008-07-04 09:52:14 +02:00
file-nommu.c	nommu: ramfs: pages allocated to an inode's pagecache may get wrongly discarded	2009-03-14 11:57:22 -07:00
inode.c	zero i_uid/i_gid on inode allocation	2009-01-05 11:54:28 -05:00
internal.h
Makefile