lib/decompress.c add __init to decompress_method and data
WARNING: vmlinux.o(.text+0x14cfd8): Section mismatch in
reference from the variable compressed_formats to the function
.init.text:gunzip()
The function compressed_formats() references
the function __init gunzip().
etc..
This patch should solve it:
Within decompress.c, compressed_formats[] needs 'a __initdata annotation',
because some of it's data members refer to functions which will be
unloaded after init.
Consequently, its user decompress_method() will get the __init prefix.
kernel/resource.c: fix stack overflow in __reserve_region_with_split()
Using a recurvise call add a non-conflicting region in
__reserve_region_with_split() could result in a stack overflow in the case
that the recursive calls are too deep. Convert the recursive calls to an
iterative loop to avoid the problem.
Tested on a machine containing 135 regions. The kernel no longer panicked
with stack overflow.
Also tested with code arbitrarily adding regions with no conflict,
embedding two consecutive conflicts and embedding two non-consecutive
conflicts.
Signed-off-by: T Makphaibulchoke <tmac@hp.com> Reviewed-by: Ram Pai <linuxram@us.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@gmail.com> Cc: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
taskstats: cgroupstats_user_cmd() may leak on error
If prepare_reply() succeeds we have allocated memory for 'rep_skb'. If
nla_reserve() then subsequently fails and returns NULL we fail to release
the memory we allocated, thus causing a leak.
Ed Cashin [Fri, 28 Sep 2012 00:22:26 +0000 (10:22 +1000)]
aoe: update documentation with new URL and VM settings reference
The old area has a new URL. Also, now that the driver can perform better,
it is worth mentioning the VM settings that help aoe to sink dirty pages
out early, avoiding unecessary memory pressure when much I/O is going on.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:25 +0000 (10:22 +1000)]
aoe: update internal version number to 49
The internal version number of the aoe driver appears in a console message
when the driver loads and is usually obtained by the user with the
userland aoe-version tool, part of the aoetools.[1]
Although this patchset includes bugfixes backported from higher-numbered
versions published on the coraid.com website, it is a form of version 49.
1. http://aoetools.sourceforge.net/
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:24 +0000 (10:22 +1000)]
aoe: associate frames with the AoE storage target
In the driver code, "target" and aoetgt refer to a particular remote
interface on the AoE storage target. The latter is identified by its AoE
major and minor addresses. Commands that are being sent to an AoE storage
target {major, minor} can be sent or retransmitted to any of the remote
MAC addresses associated with the AoE storage target.
That is, frames are naturally associated with not an aoetgt (AoE major,
AoE minor, remote MAC address) but an aoedev (AoE major, AoE minor).
Making the code reflect that reality simplifies the driver, especially
when the path to a remote MAC address becomes unusable.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:24 +0000 (10:22 +1000)]
aoe: disallow unsupported AoE minor addresses
A guard is inserted to prevent AoE minor addresses (slot addresses) higher
than 15 to be used, as they are not yet supported by the driver.
There is a change coming that will allow the aoe driver to overcome this
limit by using system device minor numbers dynamically, but until then,
this guard prevents unexpected targets from being used by the driver when
AoE targets with high minor numbers are on the AoE network.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:24 +0000 (10:22 +1000)]
aoe: do revalidation steps in order
The discovery process begins with an optional AoE config query command and
an AoE config query response. Normally when an aoe device is already
open, the config query response does not trigger an ATA identify device
command to be sent out, since the response contains storage capacity
information that, if changed, could surprise the user of the device.
The userland "aoe-revalidate" tool uses a character device to trigger an
AoE config query for a particular AoE storage target and an ATA device
identify command, even when the device is open.
This change causes the config query to go out first, reflecting the normal
discovery sequence. The responses could come back in any order, so this
change is fairly cosmetic.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:23 +0000 (10:22 +1000)]
aoe: failover remote interface based on aoe_deadsecs parameter
The aoe_deadsecs module parameter allows the user to specify a hard limit
on the number of seconds an AoE command can be retransmitted before the
AoE block device is considered to have failed.
Using aoe_deadsecs to determine the time we try using a different remote
interface helps to ensure that the hard limit is not reached before we've
tried to recover by sending to a different remote port.
As a data storage target, the AoE target is unambiguously identified by
its {major, minor} AoE address tuple, and an AoE target can have multiple
MAC addresses. However, note that "target" in the driver code and
comments means a {major, minor, MAC address} tuple, as in "somewhere to
send packets".
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:23 +0000 (10:22 +1000)]
aoe: use packets that work with the smallest-MTU local interface
Users with several network interfaces dedicated to AoE generally do not
configure them to support different-sized AoE data payloads on purpose.
For a given AoE target, there will be a set of local network interfaces
that can reach it. Using only the payload that will fit in the
smallest-sized MTU of all those local interfaces greatly simplifies the
driver, especially in failure scenarios.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:23 +0000 (10:22 +1000)]
aoe: use a kernel thread for transmissions
The dev_queue_xmit function needs to have interrupts enabled, so the most
simple way to get the locking right but still fulfill that requirement is
to use a process that can call dev_queue_xmit serially over queued
transmissions.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:22 +0000 (10:22 +1000)]
aoe: become I/O request queue handler for increased user control
To allow users to choose an elevator algorithm for their particular
workloads, change from a make_request-style driver to an
I/O-request-queue-handler-style driver.
We have to do a couple of things that might be surprising. We manipulate
the page _count directly on the assumption that we still have no guarantee
that users of the block layer are prohibited from submitting bios
containing pages with zero reference counts.[1] If such a prohibition now
exists, I can get rid of the _count manipulation.
Just as before this patch, we still keep track of the sk_buffs that the
network layer still hasn't finished yet and cap the resources we use with
a "pool" of skbs.[2]
Now that the block layer maintains the disk stats, the aoe driver's
diskstats function can go away.
Dan Carpenter [Fri, 28 Sep 2012 00:22:22 +0000 (10:22 +1000)]
aoe: cleanup an allocation a bit
We changed this recently so we can just use kzalloc() here instead of
kcalloc(1, ...). Kernel style prefers sizeof(*t) over sizeof *t. The
kfree(t) is a no-op now as well so that can be removed.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:22 +0000 (10:22 +1000)]
aoe: kernel thread handles I/O completions for simple locking
Make the frames the aoe driver uses to track the relationship between bios
and packets more flexible and detached, so that they can be passed to an
"aoe_ktio" thread for completion of I/O.
The frames are handled much like skbs, with a capped amount of
preallocation so that real-world use cases are likely to run smoothly and
degenerate gracefully even under memory pressure.
Decoupling I/O completion from the receive path and serializing it in a
process makes it easier to think about the correctness of the locking in
the driver, especially in the case of a remote MAC address becoming
unusable.
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ed Cashin [Fri, 28 Sep 2012 00:22:21 +0000 (10:22 +1000)]
aoe: for performance support larger packet payloads
tAdd adds the ability to work with large packets composed of a number of
segments, using the scatter gather feature of the block layer (biovecs)
and the network layer (skb frag array). The motivation is the performance
gained by using a packet data payload greater than a page size and by
using the network card's scatter gather feature.
Users of the out-of-tree aoe driver already had these changes, but since
early 2011, they have complained of increased memory utilization and
higher CPU utilization during heavy writes.[1] The commit below appears
related, as it disables scatter gather on non-IP protocols inside the
harmonize_features function, even when the NIC supports sg.
net offloading: Generalize netif_get_vlan_features().
With that regression in place, transmits always linearize sg AoE packets,
but in-kernel users did not have this patch. Before 2.6.38, though, these
changes were working to allow sg to increase performance.
Paul Clements [Fri, 28 Sep 2012 00:22:21 +0000 (10:22 +1000)]
nbd: handle discard requests
Add discard support to nbd. If the nbd-server supports discard, it will
send NBD_FLAG_SEND_TRIM to the client. The client will then set the flag
in the kernel via NBD_SET_FLAGS, which tells the kernel to enable discards
for the device (QUEUE_FLAG_DISCARD).
If discard support is enabled, then when the nbd client system receives a
discard request, this will be passed along to the nbd-server. When the
discard request is received by the nbd-server, it will perform:
fallocate(.. FALLOC_FL_PUNCH_HOLE ..)
To punch a hole in the backend storage, which is no longer needed.
Signed-off-by: Paul Clements <paul.clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Paul Clements [Fri, 28 Sep 2012 00:22:21 +0000 (10:22 +1000)]
nbd: add set flags ioctl
Add a set-flags ioctl, allowing various option flags to be set on an nbd
device. This allows the nbd-client to set the device flags (to enable
read-only mode, or enable discard support, etc.).
Flags are typically specified by the nbd-server. During the negotiation
phase of the nbd connection, the server sends its flags to the client.
The client then uses NBD_SET_FLAGS to inform the kernel of the options.
Also included is a one-line fix to debug output for the set-timeout ioctl.
Signed-off-by: Paul Clements <paul.clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
rapidio: apply RX/TX enable to active switch ports only
Apply port RX/TX enable operations only to active switch ports.
RapidIO specification (Part 6: LP-Serial Physical Layer) recommends to
keep Output Port Enable (TX) and Input Port Enable (RX) control bits in
disabled state (0b0) after device reset. It also allows to have
implementation specific reset state for these bits.
This patch ensures that TX/RX enable action is applied only to active
switch's ports while preserving an initial state of inactive ones.
This patch is intended to keep inactive switch ports with inbound and
outbound packet transfers disabled to block unexpected packets during hot
insertion event. While it does not fix any visible malfunction it is
intended to prevent such events in future.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Add Tsi721 routines to support RapidIO subsystem's inbound memory mapping
interface (RapidIO to system's local memory).
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Add common inbound memory mapping/unmapping interface. This allows to make
local memory space accessible from the RapidIO side using hardware mapping
capabilities of RapidIO bridging devices. The new interface is intended to
enable data transfers between RapidIO devices in combination with DMA engine
support.
This patch is based on patch submitted by Li Yang <leoli@freescale.com>
(https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-April/071210.html)
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
rapidio: fix kerneldoc warnings after DMA support was added
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Reported-by: Robert P. J. Day <rpjday@crashcourse.ca> Cc: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Modify RapidIO mport device name assignment to include device name of PCIe
side of Tsi721 bridge. The new name format is intended to provide
definitive reference between RapidIO and PCIe sides of the bridge in
systems with multiple Tsi721 bridges.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ipc/sem.c uses a custom wakeup scheme that relies on preempt_disable().
On -RT, this causes increased latencies and debug warnings.
The patch adds two additional schemes:
- one built around a completion - could be better for -RT kernels
- one built around a spinlock - unfortunately it's broken
- and the current one
My preferred solution would be the spinlock implementation: RT would use
premptible spinlocks, mainline normal spinlocks. Thus both get the
optimal implementation without any special code in ipc/sem.c.
Unfortunately, I don't see how it could be fixed.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
yan [Fri, 28 Sep 2012 00:22:16 +0000 (10:22 +1000)]
proc: no need to initialize proc_inode->fd in proc_get_inode()
proc_get_inode() obtains the inode via a call to iget_locked().
iget_locked() calls alloc_inode() which will call proc_alloc_inode() which
clears proc_inode.fd, so there is no need to clear this field in
proc_get_inode().
If iget_locked() instead found the inode via find_inode_fast(), that inode
will not have I_NEW set so this change has no effect.
Signed-off-by: yan <clouds.yan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
yan [Fri, 28 Sep 2012 00:22:16 +0000 (10:22 +1000)]
proc: return -ENOMEM when inode allocation failed
If proc_get_inode() returns NULL then presumably it encountered memory
exhaustion. proc_lookup_de() should return -ENOMEM in this case, not
-EINVAL.
Signed-off-by: yan <clouds.yan@gmail.com> Cc: Ryan Mallon <rmallon@gmail.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
coredump: extend core dump note section to contain file names of mapped files
This note has the following format:
long count -- how many files are mapped
long page_size -- units for file_ofs
array of [COUNT] elements of
long start
long end
long file_ofs
followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
coredump: add a new elf note with siginfo of the signal
Existing PRSTATUS note contains only si_signo, si_code, si_errno fields
from the siginfo of the signal which caused core to be dumped.
There are tools which try to analyze crashes for possible security
implications, and they want to use, among other data, si_addr field from
the SIGSEGV.
This patch adds a new elf note, NT_SIGINFO, which contains the complete
siginfo_t of the signal which killed the process.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
compat: move compat_siginfo_t definition to asm/compat.h
This is a preparatory patch for the introduction of NT_SIGINFO elf note.
Make the location of compat_siginfo_t uniform across eight architectures
which have it. Now it can be pulled in by including asm/compat.h or
linux/compat.h.
Most of the copies are verbatim. compat_uid[32]_t had to be replaced by
__compat_uid[32]_t. compat_uptr_t had to be moved up before
compat_siginfo_t in asm/compat.h on a several architectures (tile already
had it moved up). compat_sigval_t had to be relocated from linux/compat.h
to asm/compat.h.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
coredump: pass siginfo_t* to do_coredump() and below, not merely signr
This is a preparatory patch for the introduction of NT_SIGINFO elf note.
With this patch we pass "siginfo_t *siginfo" instead of "int signr" to
do_coredump() and put it into coredump_params. It will be used by the
next patch. Most changes are simple s/signr/siginfo->si_signo/.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Amerigo Wang <amwang@redhat.com> Cc: "Jonathan M. Foote" <jmfoote@cert.org> Cc: Roland McGrath <roland@hack.frob.com> Cc: Pedro Alves <palves@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
coredump: add support for %d=__get_dumpable() in core name
Some coredump handlers want to create a core file in a way compatible with
standard behavior. Standard behavior with fs.suid_dumpable = 2 is to
create core file with uid=gid=0. However, there was no way for coredump
handler to know that the process being dumped was suid'ed.
This patch adds the new %d specifier for format_corename() which simply
reports __get_dumpable(mm->flags), this is compatible with
/proc/sys/fs/suid_dumpable we already have.
Alex Kelly [Fri, 28 Sep 2012 00:22:13 +0000 (10:22 +1000)]
coredump: update coredump-related headers
Create a new header file, fs/coredump.h, which contains functions only
used by the new coredump.c. It also moves do_coredump to the
include/linux/coredump.h header file, for consistency.
Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Alex Kelly [Fri, 28 Sep 2012 00:22:13 +0000 (10:22 +1000)]
fs: amended coredump-related sysctl functions
This fixes an error introduced in the coredump-header patch in the
coredump removal patch I submitted earlier. It should be squashed into
that patch series so that the Kconfig option to remove coredump doesn't
cause compile-time errors.
Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Alex Kelly [Fri, 28 Sep 2012 00:22:12 +0000 (10:22 +1000)]
coredump: make core dump functionality optional
Adds an expert Kconfig option, CONFIG_COREDUMP, which allows disabling of
core dump. This saves approximately 2.6k in the compiled kernel, and
complements CONFIG_ELF_CORE, which now depends on it.
CONFIG_COREDUMP also disables coredump-related sysctls, except for
suid_dumpable and related functions, which are necessary for ptrace.
Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
device_cgroup: convert device_cgroup internally to policy + exceptions
The original model of device_cgroup is having a whitelist where all the
allowed devices are listed. The problem with this approach is that is
impossible to have the case of allowing everything but few devices.
The reason for that lies in the way the whitelist is handled internally:
since there's only a whitelist, the "all devices" entry would have to be
removed and replaced by the entire list of possible devices but the ones
that are being denied. Since dev_t is 32 bits long, representing the allowed
devices as a bitfield is not memory efficient.
This patch replaces the "whitelist" by a "exceptions" list and the default
policy is kept as "deny_all" variable in dev_cgroup structure.
The current interface determines that whenever "a" is written to devices.allow
or devices.deny, the entry masking all devices will be added or removed,
respectively. This behavior is kept and it's what will determine the default
policy:
# cat devices.list
a *:* rwm
# echo a >devices.deny
# cat devices.list
# echo a >devices.allow
# cat devices.list
a *:* rwm
The interface is also preserved. For example, if one wants to block only access
to /dev/null:
# ls -l /dev/null
crw-rw-rw- 1 root root 1, 3 Jul 24 16:17 /dev/null
# echo a >devices.allow
# echo "c 1:3 rwm" >devices.deny
# cat /dev/null
cat: /dev/null: Operation not permitted
# echo >/dev/null
bash: /dev/null: Operation not permitted
mknod /tmp/null c 1 3
mknod: `/tmp/null': Operation not permitted
# echo "c 1:3 r" >devices.allow
# cat /dev/null
# echo >/dev/null
bash: /dev/null: Operation not permitted
mknod /tmp/null c 1 3
mknod: `/tmp/null': Operation not permitted
# echo "c 1:3 rw" >devices.allow
# echo >/dev/null
# cat /dev/null
# mknod /tmp/null c 1 3
mknod: `/tmp/null': Operation not permitted
# echo "c 1:3 rwm" >devices.allow
# echo >/dev/null
# cat /dev/null
# mknod /tmp/null c 1 3
#
Note that I didn't rename the functions/variables in this patch, but in the
next one to make reviewing easier.
Signed-off-by: Aristeu Rozanski <aris@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Li Zefan <lizefan@huawei.com> Cc: James Morris <jmorris@namei.org> Cc: Pavel Emelyanov <xemul@openvz.org> Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This does the following:
1: Splits the arguments of a function call to stop it
from exceeding 80 characters
2: Re-indents the arguments of another function call
to prevent the splitting of a quoted string.
Maintain an index of directory inodes by starting cluster, so that
fat_get_parent() can return the proper cached inode rather than inventing
one that cannot be traced back to the filesystem root.
Add a new msdos/vfat binary mount option "nfs" so that FAT filesystems
that are _not_ exported via NFS are not saddled with maintenance of an
index they will never use.
Finally, simplify NFS file handle generation and lookups. An
ext2-congruent implementation is adequate for FAT needs.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Under memory pressure, the system may evict dentries from cache. When the
FAT driver receives a NFS request involving an evicted dentry, it is
unable to reconnect it to the filesystem root. This causes the request to
fail, often with ENOENT.
This is partially due to ineffectiveness of the current FAT NFS
implementation, and partially due to an unimplemented fh_to_parent method.
The latter can cause file accesses to fail on shares exported with
subtree_check.
This patch set provides the FAT driver with the ability to
reconnect dentries. NFS file handle generation and lookups are simplified
and made congruent with ext2.
Testing has involved a memory-starved virtual machine running 3.5-rc5 that
exports a ~2 GB vfat filesystem containing a kernel tree (~770 MB, ~40000
files, 9 levels). Both 'cp -r' and 'ls -lR' operations were performed
from a client, some overlapping, some consecutive. Exports with
'subtree_check' and 'no_subtree_check' have been tested.
Note that while this patch set improves FAT's NFS support, it does not
eliminate ESTALE errors completely.
The following should be considered for NFS clients who are sensitive to ESTALE:
* Mounting with lookupcache=none
Unfortunately this can degrade performance severely, particularly for deep
filesystems.
* Incorporating VFS patches to retry ESTALE failures on the client-side,
such as https://lkml.org/lkml/2012/6/29/381
* Handling ESTALE errors in client application code
This patch:
Move NFS-related code into its own C file. No functional changes.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hfsplus: code style fixes - reworked support of extended attributes
This patch fixes code style issues:
1. Rephrase comment.
2. Fix multiline comment style.
3. The hfsplus_alloc_attr_entry() was corrected.
4. The hfsplus_unistr and hfsplus_attr_unistr structures were declared independently.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hfsplus: add support of manipulation by attributes file
Add support of manipulation by attributes file.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hfsplus: rework functionality of getting, setting and deleting of extended attributes
Rework functionality of getting, setting and deleting of extended
attributes.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hfsplus: add functionality of manipulating by records in attributes tree
Add functionality of manipulating by records in attributes tree.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hfsplus: add on-disk layout declarations related to attributes tree
Current mainline implementation of hfsplus file system driver treats as
extended attributes only two fields (fdType and fdCreator) of user_info
field in file description record (struct hfsplus_cat_file). It is
possible to get or set only these two fields as extended attributes. But
HFS+ treats as com.apple.FinderInfo extended attribute an union of
user_info and finder_info fields as for file (struct hfsplus_cat_file) as
for folder (struct hfsplus_cat_folder). Moreover, current mainline
implementation of hfsplus file system driver doesn't support special
metadata file - attributes tree.
Mac OS X 10.4 and later support extended attributes by making use of the
HFS+ filesystem Attributes file B*-tree feature which allows for named
forks. Mac OS X supports only inline extended attributes, limiting their
size to 3802 bytes. Any regular file may have a list of extended
attributes. HFS+ supports an arbitrary number of named forks. Each
attribute is denoted by a name and the associated data. The name is a
null-terminated Unicode string. It is possible to list, to get, to set,
and to remove extended attributes from files or directories.
It exists some peculiarity during getting of extended attributes list by
means of getfattr utility. The getfattr utility expects prefix "user."
before any extended attribute's name. So, it ignores any names that don't
contained such prefix. Such behavior of getfattr utility results in
unexpected empty output of extended attributes list even in the case when
file (or folder) contains extended attributes. It needs to use empty
string as regular expression pattern for names matching (getfattr
--match="").
For support of extended attributes in HFS+:
1. It was added necessary on-disk layout declarations related to
Attributes tree into hfsplus_raw.h file.
2. It was added attributes.c file with implementation of functionality
of manipulation by records in Attributes tree.
3. It was reworked hfsplus_listxattr, hfsplus_getxattr,
hfsplus_setxattr functions in ioctl.c. Moreover, it was added
hfsplus_removexattr method.
This patch:
Add all neccessary on-disk layout declarations related to attributes
file.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Commit c3b79770e51ab1fd ("rtc: m41t80: Workaround broken alarm
functionality") disabled m41t80's alarm functions. But since those
functions were not touched, building this driver triggers these GCC
warnings:
drivers/rtc/rtc-m41t80.c:216:12: warning: 'm41t80_rtc_alarm_irq_enable' defined but not used [-Wunused-function]
drivers/rtc/rtc-m41t80.c:238:12: warning: 'm41t80_rtc_set_alarm' defined but not used [-Wunused-function]
drivers/rtc/rtc-m41t80.c:308:12: warning: 'm41t80_rtc_read_alarm' defined but not used [-Wunused-function]
Remove these functions (and the commented out references to them) to
silence these warnings. Anyone wanting to fix the alarm irq functionality
can easily find the removed code in the git log of this file or through
some web searches.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:39 +0000 (10:20 +1000)]
drivers/rtc/rtc-em3027.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:39 +0000 (10:20 +1000)]
drivers/rtc/rtc-isl1208.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:39 +0000 (10:20 +1000)]
drivers/rtc/rtc-pcf8563.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:38 +0000 (10:20 +1000)]
drivers/rtc/rtc-rs5c372.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future. while at it also fix a checkpatch
warn WARNING: sizeof rs5c->buf should be sizeof(rs5c->buf)
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:38 +0000 (10:20 +1000)]
drivers/rtc/rtc-s35390a.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:38 +0000 (10:20 +1000)]
drivers/rtc/rtc-x1205.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Shubhrajyoti D [Fri, 28 Sep 2012 00:20:37 +0000 (10:20 +1000)]
drivers/rtc/rtc-ds1672.c: convert struct i2c_msg initialization to C99 format
Convert the struct i2c_msg initialization to C99 format. This makes
maintaining and editing the code simpler. Also helps once other fields
like transferred are added in future.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
drivers/rtc/class.c: In function 'rtc_init':
drivers/rtc/class.c:261:23: error: 'rtc_suspend' undeclared (first use in t=
his function)
drivers/rtc/class.c:261:23: note: each undeclared identifier is reported on=
ly once for each function it appears in
drivers/rtc/class.c:262:22: error: 'rtc_resume' undeclared (first use in th=
is function)
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: David Fries <David@Fries.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Fries <David@Fries.net> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Fries [Fri, 28 Sep 2012 00:20:36 +0000 (10:20 +1000)]
rtc_sysfs_show_hctosys(): display 0 if resume failed
Without this patch /sys/class/rtc/$CONFIG_RTC_HCTOSYS_DEVICE/hctosys
contains a 1 (meaning "This rtc was used to initialize the system
clock") even if setting the time by do_settimeofday() at bootup failed.
The RTC can also be used to set the clock on resume, if it did 1,
otherwise 0. Previously there was no indication if the RTC was used
to set the clock in resume.
This uses only CONFIG_RTC_HCTOSYS_DEVICE for conditional compilation
instead of it and CONFIG_RTC_HCTOSYS to be more consistent.
rtc_hctosys_ret was moved to class.c so class.c no longer depends on
hctosys.c.
Signed-off-by: David Fries <David@Fries.net> Cc: Matthew Garrett <mjg@redhat.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Julia Lawall [Fri, 28 Sep 2012 00:20:35 +0000 (10:20 +1000)]
drivers/rtc/rtc-coh901331.c: use clk_prepare_enable() and clk_disable_unprepare()
clk_prepare_enable and clk_disable_unprepare combine clk_prepare and
clk_enable, and clk_disable and clk_unprepare. They make the code more
concise, and ensure that clk_unprepare is called when clk_enable fails.
A simplified version of the semantic patch that introduces calls to these
functions is as follows: (http://coccinelle.lip6.fr/)
Add an RTC driver for the RTC device on Ricoh MFD Rc5t583. Ricoh RTC has
3 types of alarms. The current patch adds support for the Y-Alarm of
RC5t583 RTC.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
There are several comparisons of a unsigned int to less than zero int
spear RTC driver. Such a check will always be true. In all these cases a
signed int is assigned to the unsigned variable, which is checked, before.
So the right fix is to make the checked variable signed as well. In one
case the check can be dropped completely, because all it does it returns
'err' if 'err' is less than zero, otherwise it returns 0. Since in this
particular case 'err' is always either 0 or less this is the same as just
returning 'err'.
The issue has been found using the following coccinelle semantic patch:
//<smpl>
@@
type T;
unsigned T i;
@@
(
*i < 0
|
*i >= 0
)
//</smpl>
The irq field of the jz4740_irc struct is unsigned. Yet we assign the
result of platform_get_irq() to it. platform_get_irq() may return a
negative error code and the code checks for this condition by checking if
'irq' is less than zero. But since 'irq' is unsigned this test will
always be false. Fix it by making 'irq' signed.
The issue was found using the following coccinelle semantic patch:
//<smpl>
@@
type T;
unsigned T i;
@@
(
*i < 0
|
*i >= 0
)
//</smpl>
Stephen Warren [Fri, 28 Sep 2012 00:20:33 +0000 (10:20 +1000)]
rtc: add MAX8907 RTC driver
The MAX8907 is an I2C-based power-management IC containing voltage
regulators, a reset controller, a real-time clock, and a touch-screen
controller.
The driver is based on an original by or fixed by:
* Tom Cherry
* Prashant Gaikwad
* Joseph Yoon
During upstreaming, I (swarren):
* Converted to regmap.
* Fixed handling of RTC_HOUR register containing 12.
* Fixed handling of RTC_WEEKDAY register.
* General cleanup.
Signed-off-by: Stephen Warren <swarren@nvidia.com> Cc: Tom Cherry <tcherry@nvidia.com> Cc: Prashant Gaikwad <pgaikwad@nvidia.com> Cc: Joseph Yoon <tyoon@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
As TPS65910 mfd uses "tps65910-rtc" as driver name, change the
driver name in the RTC driver to match with the same.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
rtc: tps65910: add RTC driver for TPS65910 PMIC RTC
TPS65910 PMIC is a MFD with RTC as one of the device. Adding RTC driver
for supporting RTC device present inside TPS65910 PMIC.
Only support for RTC alarm is implemented as part of this patch.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
projects / karo-tx-linux.git / log