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Commit Graph

614432 Commits

Author SHA1 Message Date
Alex Deucher
649663cf63 drm/amdgpu/powerplay: partial revert of endian fixes
This fixes a warning on big endian. Bitfields need to
be handled properly.

Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-07-29 14:36:46 -04:00
Alex Deucher
fc94d32dbf drm/radeon: drop confusing message about backlight control
The message is harmless and confusing.  On PX systems,
there is one ATIF method, but potentially multiple GPUs
leading to an error on the GPU with no backlight control.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=115011
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Hans de Goede <jwrdegoede@fedoraproject.org>
2016-07-29 14:36:45 -04:00
Nicholas Mc Guire
ecb2caae6a drm/radeon/ci add comment to document intentionally unreachable code
commit d967be9b80 ("drm/radeon/ci: disable needless sclk changes")
 introduces an unreachable if(C != C) conditional code section
 flagged by coccinelle script bad_conditional.cocci:

 Add a comment to make it clear that this is intentional.

 Fixes: d967be9b80 ("drm/radeon/ci: disable needless sclk changes")

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-07-29 14:36:45 -04:00
Lyude
23a1a9e54e drm/amdgpu: Disable RPM helpers while reprobing connectors on resume
Just about all of amdgpu's connector probing functions try to acquire
runtime PM refs. If we try to do this in the context of
amdgpu_resume_kms by calling drm_helper_hpd_irq_event(), we end up
deadlocking the system.

Since we're guaranteed to be holding the spinlock for RPM in
amdgpu_resume_kms, and we already know the GPU is in working order, we
need to prevent the RPM helpers from trying to run during the initial
connector reprobe on resume.

There's a couple of solutions I've explored for fixing this, but this
one by far seems to be the simplest and most reliable (plus I'm pretty
sure that's what disable_depth is there for anyway).

Reproduction recipe:
  - Get any laptop dual GPUs using PRIME
  - Make sure runtime PM is enabled for amdgpu
  - Boot the machine
  - If the machine managed to boot without hanging, switch out of X to
    another VT. This should definitely cause X to hang infinitely.

Changes since v1:
  - add appropriate #ifdef checks for CONFIG_PM. This is not very
    useful, but it appears some kernel test suites test compiling amdgpu
    with CONFIG_PM disabled, which results in this patch breaking the builds
    if we don't include this #ifdef

Cc: stable@vger.kernel.org
Cc: Alex Deucher <alexdeucher@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-07-29 14:36:44 -04:00
Alex Deucher
69ee9742f9 drm/radeon: init atpx at switcheroo register time v2
If we do it at enable time, it's too late for the feature
checks.

v2: drop .init setting as per Peter's comments

bug: https://bugzilla.kernel.org/show_bug.cgi?id=115321
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Peter Wu <peter@lekensteyn.nl>
2016-07-29 14:36:44 -04:00
Alex Deucher
6b1095eedd drm/amdgpu: init atpx at switcheroo register time (v2)
If we do it at enable time, it's too late for the feature
checks.

v2: drop .init setting as per Peter's comments

Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Peter Wu <peter@lekensteyn.nl>
2016-07-29 14:36:32 -04:00
Linus Torvalds
b0c4e2acdd Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
Pull CIFS/SMB3 fixes from Steve French:
 "Various CIFS/SMB3 fixes, most for stable"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  CIFS: Fix a possible invalid memory access in smb2_query_symlink()
  fs/cifs: make share unaccessible at root level mountable
  cifs: fix crash due to race in hmac(md5) handling
  cifs: unbreak TCP session reuse
  cifs: Check for existing directory when opening file with O_CREAT
  Add MF-Symlinks support for SMB 2.0
2016-07-29 11:29:13 -07:00
Nitin Gupta
7bc3777ca1 sparc64: Trim page tables for 8M hugepages
For PMD aligned (8M) hugepages, we currently allocate
all four page table levels which is wasteful. We now
allocate till PMD level only which saves memory usage
from page tables.

Also, when freeing page table for 8M hugepage backed region,
make sure we don't try to access non-existent PTE level.

Orabug: 22630259

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-29 10:49:16 -07:00
Josh Poimboeuf
2af04ea545 objtool: Un-capitalize "Warning" for out-of-sync instruction decoder
Change "Warning" to "warning" to make it look more like a GCC warning.
Hopefully that will be enough to help the 0-day bot or other automated
tools catch this warning earlier before it ends up in Linus's tree.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/b1669f391a5db91040427fd9f8e1e79db18f9709.1469751119.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-29 16:57:16 +02:00
Josh Poimboeuf
8d94c2f919 objtool: Resync x86 instruction decoder with the kernel's
This fixes the following warning:

  Warning: objtool: x86 instruction decoder differs from kernel

Unfortunately we have three identical copies of the x86 instruction
decoder in the kernel tree that have to be manually kept in sync.

It's on my TODO list to at least library-ize the ones in the tools
subdir so we'd only have two of them instead of three.  In the meantime,
here's another manual sync.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: c61f4d5eba ("perf tools: Add AVX-512 support to the instruction decoder used by Intel PT")
Link: http://lkml.kernel.org/r/d7f74b4d91fed25b0be33cd5c86f5131fa1a7529.1469751119.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-29 16:57:16 +02:00
Josh Poimboeuf
6d01f28bc0 objtool: Support new GCC 6 switch jump table pattern
This fixes some false positive objtool warnings seen with gcc 6.1.1:

  kernel/trace/ring_buffer.o: warning: objtool: ring_buffer_read_page()+0x36c: sibling call from callable instruction with changed frame pointer
  arch/x86/kernel/reboot.o: warning: objtool: native_machine_emergency_restart()+0x139: sibling call from callable instruction with changed frame pointer
  lib/xz/xz_dec_stream.o: warning: objtool: xz_dec_run()+0xc2: sibling call from callable instruction with changed frame pointer

With GCC 6, a new code pattern is sometimes used to access a switch
statement jump table in .rodata, which objtool doesn't yet recognize:

  mov [rodata addr],%reg1
  ... some instructions ...
  jmpq *(%reg1,%reg2,8)

Add support for detecting that pattern.  The detection code is rather
crude, but it's still effective at weeding out false positives and
catching real warnings.  It can be refined later once objtool starts
reading DWARF CFI.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/b8c9503b4ad8c8a827cc5400db4c1b40a3ea07bc.1469751119.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-29 16:56:21 +02:00
Ingo Molnar
9ecabeded8 perf/urgent fix:
- Fix the tools/vm/ build by making libapi provide the str_error_c function,
   that libapi uses but wasn't part of the list of objects linked with
   tools/vm/ programs.  (Arnaldo Carvalho de Melo)
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-urgent-for-mingo-20160728' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Pull perf/urgent fix from Arnaldo Carvalho de Melo:

 - Fix the tools/vm/ build by making libapi provide the str_error_c function,
   that libapi uses but wasn't part of the list of objects linked with
   tools/vm/ programs.  (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-29 16:53:50 +02:00
Miklos Szeredi
4a7f4e88fe fuse: use filemap_check_errors()
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 14:10:57 +02:00
Miklos Szeredi
d72d9e2a5d mm: export filemap_check_errors() to modules
Can be used by fuse, btrfs and f2fs to replace opencoded variants.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 14:10:57 +02:00
Wei Fang
9446385f05 fuse: fix wrong assignment of ->flags in fuse_send_init()
FUSE_HAS_IOCTL_DIR should be assigned to ->flags, it may be a typo.

Signed-off-by: Wei Fang <fangwei1@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 69fe05c90e ("fuse: add missing INIT flags")
Cc: <stable@vger.kernel.org>
2016-07-29 14:10:57 +02:00
Maxim Patlasov
9ebce595f6 fuse: fuse_flush must check mapping->flags for errors
fuse_flush() calls write_inode_now() that triggers writeback, but actual
writeback will happen later, on fuse_sync_writes(). If an error happens,
fuse_writepage_end() will set error bit in mapping->flags. So, we have to
check mapping->flags after fuse_sync_writes().

Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 4d99ff8f12 ("fuse: Turn writeback cache on")
Cc: <stable@vger.kernel.org> # v3.15+
2016-07-29 14:10:57 +02:00
Alexey Kuznetsov
ac7f052b9e fuse: fsync() did not return IO errors
Due to implementation of fuse writeback filemap_write_and_wait_range() does
not catch errors. We have to do this directly after fuse_sync_writes()

Signed-off-by: Alexey Kuznetsov <kuznet@virtuozzo.com>
Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 4d99ff8f12 ("fuse: Turn writeback cache on")
Cc: <stable@vger.kernel.org> # v3.15+
2016-07-29 14:10:57 +02:00
Josh Poimboeuf
4ce827b4cc x86/power/64: Fix hibernation return address corruption
In kernel bug 150021, a kernel panic was reported when restoring a
hibernate image.  Only a picture of the oops was reported, so I can't
paste the whole thing here.  But here are the most interesting parts:

  kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
  BUG: unable to handle kernel paging request at ffff8804615cfd78
  ...
  RIP: ffff8804615cfd78
  RSP: ffff8804615f0000
  RBP: ffff8804615cfdc0
  ...
  Call Trace:
   do_signal+0x23
   exit_to_usermode_loop+0x64
   ...

The RIP is on the same page as RBP, so it apparently started executing
on the stack.

The bug was bisected to commit ef0f3ed5a4 (x86/asm/power: Create
stack frames in hibernate_asm_64.S), which in retrospect seems quite
dangerous, since that code saves and restores the stack pointer from a
global variable ('saved_context').

There are a lot of moving parts in the hibernate save and restore paths,
so I don't know exactly what caused the panic.  Presumably, a FRAME_END
was executed without the corresponding FRAME_BEGIN, or vice versa.  That
would corrupt the return address on the stack and would be consistent
with the details of the above panic.

[ rjw: One major problem is that by the time the FRAME_BEGIN in
  restore_registers() is executed, the stack pointer value may not
  be valid any more.  Namely, the stack area pointed to by it
  previously may have been overwritten by some image memory contents
  and that page frame may now be used for whatever different purpose
  it had been allocated for before hibernation.  In that case, the
  FRAME_BEGIN will corrupt that memory. ]

Instead of doing the frame pointer save/restore around the bounds of the
affected functions, just do it around the call to swsusp_save().

That has the same effect of ensuring that if swsusp_save() sleeps, the
frame pointers will be correct.  It's also a much more obviously safe
way to do it than the original patch.  And objtool still doesn't report
any warnings.

Fixes: ef0f3ed5a4 (x86/asm/power: Create stack frames in hibernate_asm_64.S)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=150021
Cc: 4.6+ <stable@vger.kernel.org> # 4.6+
Reported-by: Andre Reinke <andre.reinke@mailbox.org>
Tested-by: Andre Reinke <andre.reinke@mailbox.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-07-29 13:38:59 +02:00
Romain Perier
8cf740ae85 crypto: marvell - Don't copy IV vectors from the _process op for ciphers
The IV output vectors should only be copied from the _complete operation
and not from the _process operation, i.e only from the operation that is
designed to copy the result of the request to the right location. This
copy is already done in the _complete operation, so this commit removes
the duplicated code in the _process op.

Fixes: 3610d6cd5231 ("crypto: marvell - Add a complete...")
Signed-off-by: Romain Perier <romain.perier@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-07-29 18:30:17 +08:00
Herbert Xu
4816c94064 lib/mpi: Fix SG miter leak
In mpi_read_raw_from_sgl we may leak the SG miter resouces after
reading the leading zeroes.  This patch fixes this by stopping the
iteration once the leading zeroes have been read.

Fixes: 127827b9c2 ("lib/mpi: Do not do sg_virt")
Reported-by: Nicolai Stange <nicstange@gmail.com>
Tested-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-07-29 18:30:16 +08:00
Miklos Szeredi
30c17ebfb2 ovl: simplify empty checking
The empty checking logic is duplicated in ovl_check_empty_and_clear() and
ovl_remove_and_whiteout(), except the condition for clearing whiteouts is
different:

ovl_check_empty_and_clear() checked for being upper

ovl_remove_and_whiteout() checked for merge OR lower

Move the intersection of those checks (upper AND merge) into
ovl_check_empty_and_clear() and simplify ovl_remove_and_whiteout().

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:25 +02:00
Al Viro
29c42e80ba qstr: constify instances in overlayfs
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
dbc816d05d ovl: clear nlink on rmdir
To make delete notification work on fa/inotify.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
76bc8e2843 ovl: disallow overlayfs as upperdir
This does not work and does not make sense.  So instead of fixing it
(probably not hard) just disallow.

Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
656189d207 ovl: fix warning
There's a superfluous newline in the warning message in ovl_d_real().

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Wei Yongjun
5f215013a9 ovl: remove duplicated include from super.c
Remove duplicated include.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Vivek Goyal
500cac3cce ovl: append MAY_READ when diluting write checks
Right now we remove MAY_WRITE/MAY_APPEND bits from mask if realfile is on
lower/. This is done as files on lower will never be written and will be
copied up. But to copy up a file, mounter should have MAY_READ permission
otherwise copy up will fail. So set MAY_READ in mask when MAY_WRITE is
reset.

Dan Walsh noticed this when he did access(lowerfile, W_OK) and it returned
True (context mounts) but when he tried to actually write to file, it
failed as mounter did not have permission on lower file.

[SzM] don't set MAY_READ if only MAY_APPEND is set without MAY_WRITE; this
won't trigger a copy-up.

Reported-by: Dan Walsh <dwalsh@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Vivek Goyal
e29841a0ab ovl: dilute permission checks on lower only if not special file
Right now if file is on lower/, we remove MAY_WRITE/MAY_APPEND bits from
mask as lower/ will never be written and file will be copied up. But this
is not true for special files. These files are not copied up and are opened
in place. So don't dilute the checks for these types of files.

Reported-by: Dan Walsh <dwalsh@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
d837a49bd5 ovl: fix POSIX ACL setting
Setting POSIX ACL needs special handling:

1) Some permission checks are done by ->setxattr() which now uses mounter's
creds ("ovl: do operations on underlying file system in mounter's
context").  These permission checks need to be done with current cred as
well.

2) Setting ACL can fail for various reasons.  We do not need to copy up in
these cases.

In the mean time switch to using generic_setxattr.

[Arnd Bergmann] Fix link error without POSIX ACL. posix_acl_from_xattr()
doesn't have a 'static inline' implementation when CONFIG_FS_POSIX_ACL is
disabled, and I could not come up with an obvious way to do it.

This instead avoids the link error by defining two sets of ACL operations
and letting the compiler drop one of the two at compile time depending
on CONFIG_FS_POSIX_ACL. This avoids all references to the ACL code,
also leading to smaller code.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
51f7e52dc9 ovl: share inode for hard link
Inode attributes are copied up to overlay inode (uid, gid, mode, atime,
mtime, ctime) so generic code using these fields works correcty.  If a hard
link is created in overlayfs separate inodes are allocated for each link.
If chmod/chown/etc. is performed on one of the links then the inode
belonging to the other ones won't be updated.

This patch attempts to fix this by sharing inodes for hard links.

Use inode hash (with real inode pointer as a key) to make sure overlay
inodes are shared for hard links on upper.  Hard links on lower are still
split (which is not user observable until the copy-up happens, see
Documentation/filesystems/overlayfs.txt under "Non-standard behavior").

The inode is only inserted in the hash if it is non-directoy and upper.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
39b681f802 ovl: store real inode pointer in ->i_private
To get from overlay inode to real inode we currently use 'struct
ovl_entry', which has lifetime connected to overlay dentry.  This is okay,
since each overlay dentry had a new overlay inode allocated.

Following patch will break that assumption, so need to leave out ovl_entry.
This patch stores the real inode directly in i_private, with the lowest bit
used to indicate whether the inode is upper or lower.

Lifetime rules remain, using ovl_inode_real() must only be done while
caller holds ref on overlay dentry (and hence on real dentry), or within
RCU protected regions.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:24 +02:00
Miklos Szeredi
a999d7e161 ovl: permission: return ECHILD instead of ENOENT
The error is due to RCU and is temporary.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Miklos Szeredi
d719e8f268 ovl: update atime on upper
Fix atime update logic in overlayfs.

This patch adds an i_op->update_time() handler to overlayfs inodes.  This
forwards atime updates to the upper layer only.  No atime updates are done
on lower layers.

Remove implicit atime updates to underlying files and directories with
O_NOATIME.  Remove explicit atime update in ovl_readlink().

Clear atime related mnt flags from cloned upper mount.  This means atime
updates are controlled purely by overlayfs mount options.

Reported-by: Konstantin Khlebnikov <koct9i@gmail.com> 
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Miklos Szeredi
bb0d2b8ad2 ovl: fix sgid on directory
When creating directory in workdir, the group/sgid inheritance from the
parent dir was omitted completely.  Fix this by calling inode_init_owner()
on overlay inode and using the resulting uid/gid/mode to create the file.

Unfortunately the sgid bit can be stripped off due to umask, so need to
reset the mode in this case in workdir before moving the directory in
place.

Reported-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Miklos Szeredi
9c630ebefe ovl: simplify permission checking
The fact that we always do permission checking on the overlay inode and
clear MAY_WRITE for checking access to the lower inode allows cruft to be
removed from ovl_permission().

1) "default_permissions" option effectively did generic_permission() on the
overlay inode with i_mode, i_uid and i_gid updated from underlying
filesystem.  This is what we do by default now.  It did the update using
vfs_getattr() but that's only needed if the underlying filesystem can
change (which is not allowed).  We may later introduce a "paranoia_mode"
that verifies that mode/uid/gid are not changed.

2) splitting out the IS_RDONLY() check from inode_permission() also becomes
unnecessary once we remove the MAY_WRITE from the lower inode check.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Vivek Goyal
754f8cb72b ovl: do not require mounter to have MAY_WRITE on lower
Now we have two levels of checks in ovl_permission(). overlay inode
is checked with the creds of task while underlying inode is checked
with the creds of mounter.

Looks like mounter does not have to have WRITE access to files on lower/.
So remove the MAY_WRITE from access mask for checks on underlying
lower inode.

This means task should still have the MAY_WRITE permission on lower
inode and mounter is not required to have MAY_WRITE.

It also solves the problem of read only NFS mounts being used as lower.
If __inode_permission(lower_inode, MAY_WRITE) is called on read only
NFS, it fails. By resetting MAY_WRITE, check succeeds and case of
read only NFS shold work with overlay without having to specify any
special mount options (default permission).

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Vivek Goyal
1175b6b8d9 ovl: do operations on underlying file system in mounter's context
Given we are now doing checks both on overlay inode as well underlying
inode, we should be able to do checks and operations on underlying file
system using mounter's context.

So modify all operations to do checks/operations on underlying dentry/inode
in the context of mounter.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Vivek Goyal
c0ca3d70e8 ovl: modify ovl_permission() to do checks on two inodes
Right now ovl_permission() calls __inode_permission(realinode), to do
permission checks on real inode and no checks are done on overlay inode.

Modify it to do checks both on overlay inode as well as underlying inode.
Checks on overlay inode will be done with the creds of calling task while
checks on underlying inode will be done with the creds of mounter.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Vivek Goyal
39a25b2b37 ovl: define ->get_acl() for overlay inodes
Now we are planning to do DAC permission checks on overlay inode
itself. And to make it work, we will need to make sure we can get acls from
underlying inode. So define ->get_acl() for overlay inodes and this in turn
calls into underlying filesystem to get acls, if any.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Vivek Goyal
72e4848181 ovl: move some common code in a function
ovl_create_upper() and ovl_create_over_whiteout() seem to be sharing some
common code which can be moved into a separate function.  No functionality
change.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:23 +02:00
Andreas Gruenbacher
58ed4e70f2 ovl: store ovl_entry in inode->i_private for all inodes
Previously this was only done for directory inodes.  Doing so for all
inodes makes for a nice cleanup in ovl_permission at zero cost.

Inodes are not shared for hard links on the overlay, so this works fine.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:22 +02:00
Miklos Szeredi
eead4f2dc4 ovl: use generic_delete_inode
No point in keeping overlay inodes around since they will never be reused.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-07-29 12:05:22 +02:00
Miklos Szeredi
c1b2cc1a76 ovl: check mounter creds on underlying lookup
The hash salting changes meant that we can no longer reuse the hash in the
overlay dentry to look up the underlying dentry.

Instead of lookup_hash(), use lookup_one_len_unlocked() and swith to
mounter's creds (like we do for all other operations later in the series).

Now the lookup_hash() export introduced in 4.6 by 3c9fe8cdff ("vfs: add
lookup_hash() helper") is unused and can possibly be removed; its
usefulness negated by the hash salting and the idea that mounter's creds
should be used on operations on underlying filesystems.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 8387ff2577 ("vfs: make the string hashes salt the hash")
2016-07-29 12:05:22 +02:00
Dan Carpenter
55f1cf83d5 avr32: off by one in at32_init_pio()
The pio_dev[] array has MAX_NR_PIO_DEVICES elements so the > should be
>=.

Fixes: 5f97f7f940 ('[PATCH] avr32 architecture')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
2016-07-29 11:55:57 +02:00
Hans-Christian Noren Egtvedt
6ad4a21b67 avr32: fixup code style in unistd.h and syscall_table.S
This patch swaps the mix of tabs and space for alignment of comment
after code to use spaces only.

Also document why recvmmsg was defined twice in the syscall_table.S
table, but only once in unistd.h. In short, wired in the table by
generic arch patch, but forgotten in unistd.h (review slip).
2016-07-29 11:55:57 +02:00
Hans-Christian Noren Egtvedt
389ce5a961 avr32: wire up preadv2 and pwritev2 syscalls
This patch wires up the new preadv2 and pwritev2 syscall on AVR32.

On AVR32, all parameters beyond the 5th are passed on the stack. System
calls don't use the stack -- they borrow a callee-saved register
instead. This means that syscalls that take 6 parameters must be called
through a stub that pushes the last parameter on the stack.

Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
2016-07-29 11:55:57 +02:00
Bhaktipriya Shridhar
6ea6257945 mmc: rtsx_pci: Remove deprecated create_singlethread_workqueue
The workqueue "workq" provides support for sd/mmc async request, which
makes next request do dma_map_sg() while previous request transferring
data.

The workqueue has a single workitem(&host->work) and hence doesn't require
ordering. Also, it is not being used on a memory reclaim path. Hence,
the singlethreaded workqueue has been replaced with the use of system_wq.

System workqueues have been able to handle high level of concurrency
for a long time now and hence it's not required to have a singlethreaded
workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue
created with create_singlethread_workqueue(), system_wq allows multiple
work items to overlap executions even on the same CPU; however, a
per-cpu workqueue doesn't have any CPU locality or global ordering
guarantee unless the target CPU is explicitly specified and thus the
increase of local concurrency shouldn't make any difference.

Work item has been flushed in rtsx_pci_sdmmc_drv_remove() to ensure that
there are no pending tasks while disconnecting the driver.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-29 11:29:05 +02:00
Ulf Hansson
9bce7fd6f8 mmc: rtsx_pci: Enable MMC_CAP_ERASE to allow erase/discard/trim requests
Cc: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Mauro Santos <registo.mailling@gmail.com>
2016-07-29 11:29:05 +02:00
Ulf Hansson
27f4bf7d74 mmc: rtsx_pci: Use the provided busy timeout from the mmc core
The rtsx_pci driver is using a fixed 3s timeout for R1B responses, which
in some cases isn't suffient. For example, erase/discard requests may
require longer timeouts.

Instead of always using a fixed timeout, let's use the per request
calculated busy timeout from the mmc core.

Cc: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Mauro Santos <registo.mailling@gmail.com>
2016-07-29 11:29:04 +02:00
Ulf Hansson
fa243f645a mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS
Due to previous changes this define has no longer a purpose. Instead move
the sdhci-pltfm drivers over to use the exported struct sdhci_pltfm_pmops.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-29 11:29:04 +02:00