- 18 Dec, 2012 40 commits
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Ed Cashin authored
The aoe driver already had some congestion handling, but it was limited in its ability to cope with the kind of congestion that can arise on more complex networks such as those involving paths through multiple ethernet switches. Some of the lessons from TCP's history of development can be applied to improving the congestion control and avoidance on AoE storage networks. These changes use familar concepts from Van Jacobson's "Congestion Avoidance and Control" paper from '88, without adding significant overhead. This patch depends on an upcoming patch that covers the failover case when AoE commands being retransmitted are transferred from one retransmit queue to another. Another upcoming patch increases the timing accuracy. Signed-off-by:
Ed Cashin <ecashin@coraid.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Ed Cashin authored
Make the aoe driver follow expected behavior when the user uses ioctl to get the ATA device identify information, allowing access to model, serial number, etc. Signed-off-by:
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Ed Cashin authored
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Ed Cashin authored
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Ed Cashin authored
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Ed Cashin authored
The userland aoetools package includes an "aoe-stat" command that can display a "payload size" column when the aoe driver exports this information. Users can quickly see what amount of user data is transferred inside each AoE command on the network, network headers excluded. Signed-off-by:
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Ed Cashin authored
The GPFS filesystem is an example of an aoe user that requires the aoe driver to support I/O request sizes larger than the default. Most users will not need large I/O request sizes, because they would need to be split up into multiple AoE commands anyway. Signed-off-by:
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Ed Cashin authored
Users sometimes want to cause the aoe driver to forget a particular previously discovered device when it is no longer online. The aoetools provide an "aoe-flush" command that users run to perform this administrative task. The changes below provide the support needed in the driver. Signed-off-by:
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Ed Cashin authored
The ATA over Ethernet config query response contains a "buffer count" field reflecting the AoE target's capacity to buffer incoming AoE commands. By taking the current value of this field into accound, we increase performance throughput or avoid network congestion, when the value has increased or decreased, respectively. Signed-off-by:
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Ed Cashin authored
Dropped transmits are not common, but when they do occur, increasing the transmit queue length often helps. Signed-off-by:
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Ed Cashin authored
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Ed Cashin authored
The context feature of sparse is used with the Linux kernel sources to check for imbalanced uses of locks. Document the annotations defined in include/linux/compiler.h that tell sparse what to expect when a lock is held on function entry, exit, or both. Signed-off-by:
Josh Triplett <josh@joshtriplett.org> Acked-by:
Christopher Li <sparse@chrisli.org> Signed-off-by:
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Josh Triplett authored
linux/compiler.h has macros to denote functions that acquire or release locks, but not to denote functions called with a lock held that return with the lock still held. Add a __must_hold macro to cover that case. Signed-off-by:
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Gao feng authored
Since commit 1cdcbec1 ("CRED: Neuter sys_capset()") is_container_init() has no callers. Signed-off-by:
Gao feng <gaofeng@cn.fujitsu.com> Cc: David Howells <dhowells@redhat.com> Acked-by:
Serge Hallyn <serge.hallyn@canonical.com> Cc: James Morris <jmorris@namei.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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Kees Cook authored
To avoid an explosion of request_module calls on a chain of abusive scripts, fail maximum recursion with -ELOOP instead of -ENOEXEC. As soon as maximum recursion depth is hit, the error will fail all the way back up the chain, aborting immediately. This also has the side-effect of stopping the user's shell from attempting to reexecute the top-level file as a shell script. As seen in the dash source: if (cmd != path_bshell && errno == ENOEXEC) { *argv-- = cmd; *argv = cmd = path_bshell; goto repeat; } The above logic was designed for running scripts automatically that lacked the "#!" header, not to re-try failed recursion. On a legitimate -ENOEXEC, things continue to behave as the shell expects. Additionally, when tracking recursion, the binfmt handlers should not be involved. The recursion being tracked is the depth of calls through search_binary_handler(), so that function should be exclusively responsible for tracking the depth. Signed-off-by:Kees Cook <keescook@chromium.org> Cc: halfdog <me@halfdog.net> Cc: P J P <ppandit@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Artem Bityutskiy authored
We display a list of supplementary group for each process in /proc/<pid>/status. However, we show only the first 32 groups, not all of them. Although this is rare, but sometimes processes do have more than 32 supplementary groups, and this kernel limitation breaks user-space apps that rely on the group list in /proc/<pid>/status. Number 32 comes from the internal NGROUPS_SMALL macro which defines the length for the internal kernel "small" groups buffer. There is no apparent reason to limit to this value. This patch removes the 32 groups printing limit. The Linux kernel limits the amount of supplementary groups by NGROUPS_MAX, which is currently set to 65536. And this is the maximum count of groups we may possibly print. Signed-off-by:
Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Acked-by:
Serge E. Hallyn <serge.hallyn@ubuntu.com> Acked-by:
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Kees Cook authored
It is currently impossible to examine the state of seccomp for a given process. While attaching with gdb and attempting "call prctl(PR_GET_SECCOMP,...)" will work with some situations, it is not reliable. If the process is in seccomp mode 1, this query will kill the process (prctl not allowed), if the process is in mode 2 with prctl not allowed, it will similarly be killed, and in weird cases, if prctl is filtered to return errno 0, it can look like seccomp is disabled. When reviewing the state of running processes, there should be a way to externally examine the seccomp mode. ("Did this build of Chrome end up using seccomp?" "Did my distro ship ssh with seccomp enabled?") This adds the "Seccomp" line to /proc/$pid/status. Signed-off-by:Cyrill Gorcunov <gorcunov@openvz.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: James Morris <jmorris@namei.org> Acked-by:
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Cyrill Gorcunov authored
During c/r sessions we've found that there is no way at the moment to fetch some VMA associated flags, such as mlock() and madvise(). This leads us to a problem -- we don't know if we should call for mlock() and/or madvise() after restore on the vma area we're bringing back to life. This patch intorduces a new field into "smaps" output called VmFlags, where all set flags associated with the particular VMA is shown as two letter mnemonics. [ Strictly speaking for c/r we only need mlock/madvise bits but it has been said that providing just a few flags looks somehow inconsistent. So all flags are here now. ] This feature is made available on CONFIG_CHECKPOINT_RESTORE=n kernels, as other applications may start to use these fields. The data is encoded in a somewhat awkward two letters mnemonic form, to encourage userspace to be prepared for fields being added or removed in the future. [a.p.zijlstra@chello.nl: props to use for_each_set_bit] [sfr@canb.auug.org.au: props to use array instead of struct] [akpm@linux-foundation.org: overall redesign and simplification] [akpm@linux-foundation.org: remove unneeded braces per sfr, avoid using bloaty for_each_set_bit()] Signed-off-by:
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Andrew Vagin authored
Without this patch it is really hard to interpret a bounding set, if CAP_LAST_CAP is unknown for a current kernel. Non-existant capabilities can not be deleted from a bounding set with help of prctl. E.g.: Here are two examples without/with this patch. CapBnd: ffffffe0fdecffff CapBnd: 00000000fdecffff I suggest to hide non-existent capabilities. Here is two reasons. * It's logically and easier for using. * It helps to checkpoint-restore capabilities of tasks, because tasks can be restored on another kernel, where CAP_LAST_CAP is bigger. Signed-off-by:
Andrew Vagin <avagin@openvz.org> Cc: Andrew G. Morgan <morgan@kernel.org> Reviewed-by:
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Oleg Nesterov authored
Ptrace jailers want to be sure that the tracee can never escape from the control. However if the tracer dies unexpectedly the tracee continues to run in potentially unsafe mode. Add the new ptrace option PTRACE_O_EXITKILL. If the tracer exits it sends SIGKILL to every tracee which has this bit set. Note that the new option is not equal to the last-option << 1. Because currently all options have an event, and the new one starts the eventless group. It uses the random 20 bit, so we have the room for 12 more events, but we can also add the new eventless options below this one. Suggested by Amnon Shiloh. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Tested-by:
Amnon Shiloh <u3557@miso.sublimeip.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: Chris Evans <scarybeasts@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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Eldad Zack authored
Update the documentation for simple_strto* to reflect that it has been obsoleted and advise the usage of kstrto*. Signed-off-by:
Eldad Zack <eldad@fogrefinery.com> Cc: J. Bruce Fields <bfields@fieldses.org> Cc: Joe Perches <joe@perches.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Rob Landley <rob@landley.net> Signed-off-by:
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Eldad Zack authored
As Bruce Fields pointed out, kstrto* is currently lacking kerneldoc comments. This patch adds kerneldoc comments to common variants of kstrto*: kstrto(u)l, kstrto(u)ll and kstrto(u)int. Signed-off-by:
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Jarkko Sakkinen authored
keys-ecryptfs.txt was missing from 00-INDEX. Signed-off-by:
Jarkko Sakkinen <jarkko.sakkinen@intel.com> Signed-off-by:
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Dave Reisner authored
Option parsing code expects an unsigned integer for the codepage option, but prefixes and stores this option with "cp" before passing to load_nls(). This makes the displayed option in /proc an invalid one. Strip the prefix when printing so that the displayed option is valid for reuse. Signed-off-by:
Dave Reisner <dreisner@archlinux.org> Acked-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
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Jan Kara authored
parse_options() is supposed to return value < 0 on error however we returned 0 (success) in a lot of cases. This actually was not a problem in practice because match_token() used by parse_options() is clever and catches most of the problems for us. Signed-off-by:
Jan Kara <jack@suse.cz> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
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Jan Kara authored
So far FAT either offsets time stamps by sys_tz.minuteswest or leaves them as they are (when tz=UTC mount option is used). However in some cases it is useful if one can specify time stamp offset on his own (e.g. when time zone of the camera connected is different from time zone of the computer, or when HW clock is in UTC and thus sys_tz.minuteswest == 0). So provide a mount option time_offset= which allows user to specify offset in minutes that should be applied to time stamps on the filesystem. akpm: this code would work incorrectly when used via `mount -o remount', because cached inodes would not be updated. But fatfs's fat_remount() is basically a no-op anyway. Signed-off-by:
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Namjae Jeon authored
Change fatfs so that a warning is emitted when an attempt is made to mount a filesystem with the unsupported `discard' option. ext4 aready does this: http://patchwork.ozlabs.org/patch/192668/Signed-off-by:
Namjae Jeon <linkinjeon@gmail.com> Signed-off-by:
Amit Sahrawat <amit.sahrawat83@gmail.com> Acked-by:
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Ashish Jangam authored
A driver for the DA9055 PMIC. This has a dependency upon the DA9055 MFD core. Functionally tested on Samsung SMDKV6410. Signed-off-by:
David Dajun Chen <dchen@diasemi.com> Signed-off-by:
Ashish Jangam <ashish.jangam@kpitcummins.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by:
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Sachin Kamat authored
This eliminates having an #ifdef returning NULL for the case when OF is disabled. Signed-off-by:
Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by:
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Kim, Milo authored
Enabling RTC HW block depends on the default value of TPS65910 register. In some mode, RTC block is disabled by default.(eg. AM3517 Craneboard) In this case, RTC_PWDN(RTC power down) bit should be cleared to enable the RTC HW block. This patch also works in case that RTC block is active by default, because there is no side effect even if the bit is updated again. Tested on AM3517 Craneboard. Signed-off-by:
Milo(Woogyom) Kim <milo.kim@ti.com> Acked-by:
Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Sivaram Nair <sivaramn@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by:
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Sachin Kamat authored
This code is under #if 0 and not used. Signed-off-by:
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Tushar Behera authored
rtc-s3c driver is modified to use devm_request_and_ioremap() (combining request_mem_region and ioremap), devm_clk_get() and devm_request_irq() APIs. Since this removes the necessity of freeing the related resources the return path is also simplified. Signed-off-by:
Tushar Behera <tushar.behera@linaro.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Signed-off-by:
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Tushar Behera authored
err_nores label redirects to a simple return statement. Move the return statement to caller location and remove the label. Signed-off-by:
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Thierry Reding authored
Add an RTC driver for PCF8523 chips by NXP Semiconductors. No support is currently provided for the alarm and interrupt functions. Only the time and date functionality is implemented. Signed-off-by:
Thierry Reding <thierry.reding@avionic-design.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by:
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Devendra Naga authored
Use devm_kzalloc() and remove the error path free and the unload free as devm functions take care of freeing resources. Signed-off-by:
Devendra Naga <devendra.aaru@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Miguel Aguilar <miguel.aguilar@ridgerun.com> Signed-off-by:
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Devendra Naga authored
rtc_device_register() returns a pointer containing error code in case of error. Use that in the error return. Signed-off-by:
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Sivaram Nair authored
A cosmetic change to rename the irq name to match the device name. Signed-off-by:
Sivaram Nair <sivaramn@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by:
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Deepak Sikri authored
The applications can set the RTC hardware to trigger interrupts in one of three modes: * AIE: Alarm interrupt * UIE: Update interrupt (ie: once per second) * PIE: Periodic interrupt (sub-second irqs) The above defined 3 modes are to be supported in the RTC HW in form of interrupts. The SPEAr RTC hardware does not support the later two modes. There have been refinements in the RTC core in mainline related to use of timer queue infrastructure to manage events in RTC. Please refer the below mentioned patch for details: * RTC: Rework RTC code to use timerqueue for events * SHA ID: 6610e089 There have been provisions added to support hardware that do not have support the UIE mode. Please refer the following patch. * rtc: Provide flag for rtc devices that don't support UIE * SHA ID: 4a649903 The patch makes use of the provision defined in the above patch to update the hardware status of UIE mode. Signed-off-by:Deepak Sikri <deepak.sikri@st.com> Signed-off-by:
Viresh Kumar <viresh.kumar@linaro.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by:
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Deepak Sikri authored
clk_{un}prepare is mandatory for platforms using common clock framework. Because for SPEAr we don't do anything in clk_{un}prepare() calls, just call them once in probe/remove. Signed-off-by: -
Viresh Kumar authored
Free the rtc-spear driver from tension of freeing resources :) devm_* derivatives of multiple routines are used while allocating resources, which would be freed automatically by kernel. Signed-off-by:
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