kernel/git/stable/linux.git/mm/filemap.c, branch linux-2.6.23.y

Remove broken ptrace() special-case code from file mapping

2007-11-16T16:12:42+00:00

The kernel has for random historical reasons allowed ptrace() accesses to access (and insert) pages into the page cache above the size of the file. However, Nick broke that by mistake when doing the new fault handling in commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7 ("mm: merge populate and nopage into fault (fixes nonlinear)". The breakage caused a hang with gdb when trying to access the invalid page. The ptrace "feature" really isn't worth resurrecting, since it really is wrong both from a portability _and_ from an internal page cache validity standpoint. So this removes those old broken remnants, and fixes the ptrace() hang in the process. Noticed and bisected by Duane Griffin, who also supplied a test-case (quoth Nick: "Well that's probably the best bug report I've ever had, thanks Duane!"). Cc: Duane Griffin Acked-by: Nick Piggin Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

fix page release issue in filemap_fault

2007-10-08T19:58:14+00:00

find_lock_page increases page's usage count, we should decrease it before return VM_FAULT_SIGBUS Signed-off-by: Yan Zheng Cc: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

2007-08-11T23:01:06+00:00

* 'for-linus' of git://git.kernel.dk/linux-2.6-block: BLOCK: Hide the contents of linux/bio.h if CONFIG_BLOCK=n sysace: HDIO_GETGEO has it's own method for ages drivers/block/cpqarray.c: better error handling and kmalloc + memset conversion to k[cz]alloc drivers/block/cciss.c: kmalloc + memset conversion to kzalloc Clean up duplicate includes in drivers/block/ Fix remap handling by blktrace [PATCH] remove mm/filemap.c:file_send_actor()

readahead: docbook fix

2007-08-11T22:47:42+00:00

Minor docbook error since argument name in comment doesn't match function Signed-off-by: Stephen Hemminger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] remove mm/filemap.c:file_send_actor()

2007-08-11T20:34:47+00:00

This patch removes the no longer used file_send_actor(). Signed-off-by: Adrian Bunk Signed-off-by: Jens Axboe

fix filemap.c kernel-doc

2007-07-31T22:39:38+00:00

Fix kernel-doc warning: Warning(linux-2.6.23-rc1-mm1//mm/filemap.c:864): No description found for parameter 'ra' Signed-off-by: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

readahead: split ondemand readahead interface into two functions

2007-07-19T17:04:44+00:00

Split ondemand readahead interface into two functions. I think this makes it a little clearer for non-readahead experts (like Rusty). Internally they both call ondemand_readahead(), but the page argument is changed to an obvious boolean flag. Signed-off-by: Rusty Russell Signed-off-by: Fengguang Wu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

readahead: convert filemap invocations

2007-07-19T17:04:44+00:00

Convert filemap reads to use on-demand readahead. The new call scheme is to - call readahead on non-cached page - call readahead on look-ahead page - update prev_index when finished with the read request Signed-off-by: Fengguang Wu Cc: Steven Pratt Cc: Ram Pai Cc: Rusty Russell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: fault feedback #2

2007-07-19T17:04:41+00:00

This patch completes Linus's wish that the fault return codes be made into bit flags, which I agree makes everything nicer. This requires requires all handle_mm_fault callers to be modified (possibly the modifications should go further and do things like fault accounting in handle_mm_fault -- however that would be for another patch). [akpm@linux-foundation.org: fix alpha build] [akpm@linux-foundation.org: fix s390 build] [akpm@linux-foundation.org: fix sparc build] [akpm@linux-foundation.org: fix sparc64 build] [akpm@linux-foundation.org: fix ia64 build] Signed-off-by: Nick Piggin Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Russell King Cc: Ian Molton Cc: Bryan Wu Cc: Mikael Starvik Cc: David Howells Cc: Yoshinori Sato Cc: "Luck, Tony" Cc: Hirokazu Takata Cc: Geert Uytterhoeven Cc: Roman Zippel Cc: Greg Ungerer Cc: Matthew Wilcox Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Paul Mundt Cc: Kazumoto Kojima Cc: Richard Curnow Cc: William Lee Irwin III Cc: "David S. Miller" Cc: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Cc: Miles Bader Cc: Chris Zankel Acked-by: Kyle McMartin Acked-by: Haavard Skinnemoen Acked-by: Ralf Baechle Acked-by: Andi Kleen Signed-off-by: Andrew Morton [ Still apparently needs some ARM and PPC loving - Linus ] Signed-off-by: Linus Torvalds

mm: fault feedback #1

2007-07-19T17:04:41+00:00

Change ->fault prototype. We now return an int, which contains VM_FAULT_xxx code in the low byte, and FAULT_RET_xxx code in the next byte. FAULT_RET_ code tells the VM whether a page was found, whether it has been locked, and potentially other things. This is not quite the way he wanted it yet, but that's changed in the next patch (which requires changes to arch code). This means we no longer set VM_CAN_INVALIDATE in the vma in order to say that a page is locked which requires filemap_nopage to go away (because we can no longer remain backward compatible without that flag), but we were going to do that anyway. struct fault_data is renamed to struct vm_fault as Linus asked. address is now a void __user * that we should firmly encourage drivers not to use without really good reason. The page is now returned via a page pointer in the vm_fault struct. Signed-off-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds