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Peter Feiner 68b5a65248 mm: softdirty: respect VM_SOFTDIRTY in PTE holes 
After a VMA is created with the VM_SOFTDIRTY flag set, /proc/pid/pagemap
should report that the VMA's virtual pages are soft-dirty until
VM_SOFTDIRTY is cleared (i.e., by the next write of "4" to
/proc/pid/clear_refs).  However, pagemap ignores the VM_SOFTDIRTY flag
for virtual addresses that fall in PTE holes (i.e., virtual addresses
that don't have a PMD, PUD, or PGD allocated yet).

To observe this bug, use mmap to create a VMA large enough such that
there's a good chance that the VMA will occupy an unused PMD, then test
the soft-dirty bit on its pages.  In practice, I found that a VMA that
covered a PMD's worth of address space was big enough.

This patch adds the necessary VMA lookup to the PTE hole callback in
/proc/pid/pagemap's page walk and sets soft-dirty according to the VMAs'
VM_SOFTDIRTY flag.

Signed-off-by: Peter Feiner <pfeiner@google.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2014-08-06 18:01:22 -07:00
..
9p Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
adfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
affs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
afs AFS: Correctly assemble the client UUID 2014-07-29 10:14:36 -07:00
autofs4 autofs4: fix false positive compile error 2014-07-03 09:21:53 -07:00
befs fs/befs: kernel-doc fixes 2014-06-06 16:08:09 -07:00
bfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
btrfs Merge branch 'sched/urgent' into sched/core, to merge fixes before applying new changes 2014-07-28 10:03:00 +02:00
cachefiles fs/cachefiles: replace kerror by pr_err 2014-06-06 16:08:14 -07:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-06-12 23:06:23 -07:00
cifs sched: Allow wait_on_bit_action() functions to support a timeout 2014-07-16 15:10:41 +02:00
coda coda: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:16 -07:00
configfs fs/configfs: use pr_fmt 2014-06-04 16:53:53 -07:00
cramfs Major changes for 3.14 include support for the newly added ZERO_RANGE 2014-04-04 15:39:39 -07:00
debugfs fs: debugfs: remove trailing whitespace 2014-07-09 16:58:21 -07:00
devpts fs/devpts/inode.c: convert printk to pr_foo() 2014-06-06 16:08:14 -07:00
dlm dlm: keep listening connection alive with sctp mode 2014-06-12 10:26:14 -05:00
ecryptfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
efivarfs fs/efivarfs/super.c: use static const for dentry_operations 2014-06-04 16:54:14 -07:00
efs fs/efs: convert printk(KERN_DEBUG to pr_debug 2014-06-04 16:54:21 -07:00
exofs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
exportfs fs/exportfs/expfs.c: kernel-doc warning fixes 2014-06-04 16:54:14 -07:00
ext2 ->splice_write() via ->write_iter() 2014-06-12 00:18:51 -04:00
ext3 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
ext4 ext4: fix ext4_discard_allocated_blocks() if we can't allocate the pa struct 2014-07-30 22:17:17 -04:00
f2fs f2fs: use for_each_set_bit to simplify the code 2014-08-04 13:20:53 -07:00
fat Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
freevxfs Major changes for 3.14 include support for the newly added ZERO_RANGE 2014-04-04 15:39:39 -07:00
fscache fs/fscache: make ctl_table static 2014-08-06 18:01:12 -07:00
fuse fuse: add FUSE_NO_OPEN_SUPPORT flag to INIT 2014-07-22 16:37:43 +02:00
gfs2 Merge branch 'sched/urgent' into sched/core, to merge fixes before applying new changes 2014-07-28 10:03:00 +02:00
hfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
hfsplus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
hostfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
hpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
hppfs
…
hugetlbfs fs/hugetlbfs/inode.c: remove null test before kfree 2014-06-04 16:54:11 -07:00
isofs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2014-04-07 17:59:17 -07:00
jbd fs/jbd/revoke.c: replace shift loop by ilog2 2014-05-21 10:26:13 +02:00
jbd2 sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
jffs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
jfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
kernfs Merge 3.16-rc6 into driver-core-next 2014-07-21 10:07:25 -07:00
lockd fs: lockd: Use ktime_get_ns() 2014-07-23 15:01:44 -07:00
logfs fs/logfs/readwrite.c: kernel-doc warning fixes 2014-08-06 18:01:12 -07:00
minix write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
ncpfs fs/ncpfs/getopt.c: replace simple_strtoul by kstrtoul 2014-06-04 16:54:21 -07:00
nfs Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2014-08-06 08:06:39 -07:00
nfs_common
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nfsd NFSD: Fix crash encoding lock reply on 32-bit 2014-07-23 10:31:56 -04:00
nilfs2 write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
nls nls: have register_nls() set ->owner 2014-01-25 03:14:05 -05:00
notify fanotify: fix double free of pending permission events 2014-08-06 18:01:12 -07:00
ntfs ntfs: kernel-doc warning fixes 2014-08-06 18:01:12 -07:00
ocfs2 fs/ocfs2/slot_map.c: replace count*size kzalloc by kcalloc 2014-08-06 18:01:13 -07:00
omfs write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
openpromfs fs: push sync_filesystem() down to the file system's remount_fs() 2014-03-13 10:14:33 -04:00
proc mm: softdirty: respect VM_SOFTDIRTY in PTE holes 2014-08-06 18:01:22 -07:00
pstore fs/pstore: logging clean-up 2014-06-06 16:08:13 -07:00
qnx4 fs: push sync_filesystem() down to the file system's remount_fs() 2014-03-13 10:14:33 -04:00
qnx6 fs: push sync_filesystem() down to the file system's remount_fs() 2014-03-13 10:14:33 -04:00
quota quota: missing lock in dqcache_shrink_scan() 2014-07-15 22:36:18 +02:00
ramfs ->splice_write() via ->write_iter() 2014-06-12 00:18:51 -04:00
reiserfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
romfs switch simple generic_file_aio_read() users to ->read_iter() 2014-05-06 17:37:55 -04:00
squashfs fs/squashfs/super.c: logging cleanup 2014-08-06 18:01:13 -07:00
sysfs kernfs: move the last knowledge of sysfs out from kernfs 2014-06-03 08:11:18 -07:00
sysv write_iter variants of {__,}generic_file_aio_write() 2014-05-06 17:38:00 -04:00
ubifs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
udf udf: switch to ->write_iter() 2014-05-06 17:39:36 -04:00
ufs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
xfs xfs: null unused quota inodes when quota is on 2014-07-15 07:28:41 +10:00
Kconfig kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
Kconfig.binfmt
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Makefile block: move ioprio.c from fs/ to block/ 2014-05-19 11:02:18 -06:00
aio.c Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-08-04 10:09:27 -07:00
anon_inodes.c vfs: Allocate anon_inode_inode in anon_inode_init() 2014-03-27 09:52:54 -07:00
attr.c fs,userns: Change inode_capable to capable_wrt_inode_uidgid 2014-06-10 13:57:22 -07:00
bad_inode.c
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binfmt_aout.c
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binfmt_elf.c Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next 2014-06-05 08:05:29 -07:00
binfmt_elf_fdpic.c
…
binfmt_em86.c
…
binfmt_flat.c fs/binfmt_flat.c: make old_reloc() static 2014-06-04 16:54:21 -07:00
binfmt_misc.c binfmt_misc: add missing 'break' statement 2014-04-03 16:21:16 -07:00
binfmt_script.c
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binfmt_som.c
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block_dev.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
buffer.c sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
char_dev.c
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compat.c locks: rename file-private locks to "open file description locks" 2014-04-22 08:23:58 -04:00
compat_binfmt_elf.c binfmt_elf: add ELF_HWCAP2 to compat auxv entries 2014-03-04 08:05:21 +00:00
compat_ioctl.c Bluetooth: Move HCI socket definitions into its own header file 2014-07-11 13:53:04 +03:00
coredump.c coredump: fix the setting of PF_DUMPCORE 2014-07-23 15:10:54 -07:00
dcache.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
dcookies.c fs/compat: fix lookup_dcookie() parameter handling 2014-01-29 16:22:40 -08:00
direct-io.c direct-io: fix AIO regression 2014-08-01 02:35:51 -04:00
drop_caches.c fs: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:16 -07:00
eventfd.c eventfd_ctx_fdget(): use fdget() instead of fget() 2014-01-25 03:13:04 -05:00
eventpoll.c epoll: fix use-after-free in eventpoll_release_file 2014-06-16 17:21:59 -10:00
exec.c seccomp: implement SECCOMP_FILTER_FLAG_TSYNC 2014-07-18 12:13:40 -07:00
fcntl.c locks: rename file-private locks to "open file description locks" 2014-04-22 08:23:58 -04:00
fhandle.c
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file.c fs/file.c: don't open-code kvfree() 2014-05-06 17:31:10 -04:00
file_table.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-06-12 10:30:18 -07:00
filesystems.c sys_sysfs: Add CONFIG_SYSFS_SYSCALL 2014-04-03 16:21:05 -07:00
fs-writeback.c sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
fs_struct.c
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inode.c sched: Remove proliferation of wait_on_bit() action functions 2014-07-16 15:10:39 +02:00
internal.h
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ioctl.c
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libfs.c fs/libfs.c: add generic data flush to fsync 2014-06-04 16:53:55 -07:00
locks.c locks: purge fl_owner_t from fs/locks.c 2014-07-13 21:39:07 -04:00
mbcache.c fs/mbcache: replace __builtin_log2() with ilog2() 2014-06-25 22:08:29 -04:00
mount.h reduce m_start() cost... 2014-04-01 23:19:09 -04:00
mpage.c fs/block_dev.c: add bdev_read_page() and bdev_write_page() 2014-06-04 16:54:02 -07:00
namei.c fs: umount on symlink leaks mnt count 2014-07-24 06:18:12 -04:00
namespace.c VFS: Make delayed_free() call free_vfsmnt() 2014-04-01 23:19:18 -04:00
no-block.c
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open.c vfs: fix check for fallocate on active swapfile 2014-08-01 02:36:04 -04:00
pipe.c new helper: copy_page_from_iter() 2014-05-06 17:39:42 -04:00
pnode.c smarter propagate_mnt() 2014-04-01 23:19:08 -04:00
pnode.h smarter propagate_mnt() 2014-04-01 23:19:08 -04:00
posix_acl.c posix_acl: handle NULL ACL in posix_acl_equiv_mode 2014-05-06 13:58:42 -04:00
proc_namespace.c reduce m_start() cost... 2014-04-01 23:19:09 -04:00
read_write.c switch simple generic_file_aio_read() users to ->read_iter() 2014-05-06 17:37:55 -04:00
readdir.c fanotify: create FAN_ACCESS event for readdir 2014-06-04 16:53:52 -07:00
select.c
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seq_file.c fs/seq_file: fallback to vmalloc allocation 2014-07-03 09:21:54 -07:00
signalfd.c
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splice.c Merge commit '9f12600fe425bc28f0ccba034a77783c09c15af4' into for-linus 2014-06-12 00:28:09 -04:00
stack.c
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stat.c
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statfs.c
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super.c fs/superblock: avoid locking counting inodes and dentries before reclaiming them 2014-06-04 16:54:11 -07:00
sync.c Revert "writeback: do not sync data dirtied after sync start" 2014-02-22 02:02:28 +01:00
timerfd.c timerfd: Use ktime_mono_to_real() 2014-07-23 10:18:02 -07:00
utimes.c
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xattr.c simple_xattr: permit 0-size extended attributes 2014-07-23 15:10:55 -07:00