- 17 Oct, 2007 40 commits
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Jeff Moyer authored
Some months back I proposed changing the schedule() call in read_events to an io_schedule(): http://osdir.com/ml/linux.kernel.aio.general/2006-10/msg00024.html This was rejected as there are AIO operations that do not initiate disk I/O. I've had another look at the problem, and the only AIO operation that will not initiate disk I/O is IOCB_CMD_NOOP. However, this command isn't even wired up! Given that it doesn't work, and hasn't for *years*, I'm going to suggest again that we do proper I/O accounting when using AIO. Signed-off-by:
Jeff Moyer <jmoyer@redhat.com> Acked-by:
Zach Brown <zach.brown@oracle.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Suparna Bhattacharya <suparna@in.ibm.com> Cc: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Paul E. McKenney authored
Repost of http://lkml.org/lkml/2007/8/10/472 made available by request. The locking used by get_random_bytes() can conflict with the preempt_disable() and synchronize_sched() form of RCU. This patch changes rcutorture's RNG to gather entropy from the new cpu_clock() interface (relying on interrupts, preemption, daemons, and rcutorture's reader thread's rock-bottom scheduling priority to provide useful entropy), and also adds and EXPORT_SYMBOL_GPL() to make that interface available to GPLed kernel modules such as rcutorture. Passes several hours of rcutorture. [ego@in.ibm.com: Use raw_smp_processor_id() in rcu_random()] Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
Gautham R Shenoy <ego@in.ibm.com> Signed-off-by:
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john stultz authored
To avoid lock contention, we distribute the sched_timer calls across the cpus so they do not trigger at the same instant. However, I used NR_CPUS, which can cause needless grouping on small smp systems depending on your kernel config. This patch converts to using num_possible_cpus() so we spread it as evenly as possible on every machine. Briefly tested w/ NR_CPUS=255 and verified reduced contention. Signed-off-by:
John Stultz <johnstul@us.ibm.com> Acked-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Chris Wright authored
Lomesh reported poll returning EINTR during suspend/resume cycle. This is caused by the STOP/CONT cycle that the freezer uses, generating a pending signal for what in effect is an ignored signal. In general poll is a little eager in returning EINTR, when it could try not bother userspace and simply restart the syscall. Both select and ppoll do use ERESTARTNOHAND to restart the syscall. Oleg points out that simply using ERESTARTNOHAND will cause poll to restart with original timeout value. which could ultimately lead to process never returning to userspace. Instead use ERESTART_RESTARTBLOCK, and restart poll with updated timeout value. Inspired by Manfred's use ERESTARTNOHAND in poll patch. [bunk@kernel.org: do_restart_poll() can become static] Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Cc: "Agarwal, Lomesh" <lomesh.agarwal@intel.com> Signed-off-by:
Chris Wright <chrisw@sous-sol.org> Signed-off-by:
Adrian Bunk <bunk@kernel.org> Signed-off-by:
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Adrian Bunk authored
Allow disabling DNOTIFY with CONFIG_EMBEDDED=n. I'm currently running a kernel with dnotify disabled and I haven't run into any problem. Is there any popular application left that breaks without dnotify support in the kernel? Note that this patch does not remove dnotify support, it still defaults to "y", and the help text recommends enabling it. Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Adrian Bunk authored
simple_commit_write() can now become static. Signed-off-by:
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Adrian Bunk authored
- remove the no longer required __attribute__((weak)) of xtime_lock - remove the following no longer used EXPORT_SYMBOL's: - xtime - xtime_lock Signed-off-by:
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Eric Sandeen authored
This attempts to address CVE-2006-6058 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6058 first reported at http://projects.info-pull.com/mokb/MOKB-17-11-2006.html Essentially a corrupted minix dir inode reporting a very large i_size will loop for a very long time in minix_readdir, minix_find_entry, etc, because on EIO they just move on to try the next page. This is under the BKL, printk-storming as well. This can lock up the machine for a very long time. Simply ratelimiting the printks gets things back under control. Make the message a bit more informative while we're here. Signed-off-by:
Eric Sandeen <sandeen@redhat.com> Cc: Bodo Eggert <7eggert@gmx.de> Signed-off-by:
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vignesh babu authored
Replace n & (n - 1) with is_power_of_2(n) Signed-off-by:
vignesh babu <vignesh.babu@wipro.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by:
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Alexey Dobriyan authored
oomkilladj is int, but values which can be assigned to it are -17, [-16, 15], thus fitting into s8. While patch itself doesn't help in making task_struct smaller, because of natural alignment of ->link_count, it will make picture clearer wrt futher task_struct reduction patches. My plan is to move ->fpu_counter and ->oomkilladj after ->ioprio filling hole on i386 and x86_64. But that's for later, because bloated distro configs need looking at as well. Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Olaf Hering authored
Remove the __STRICT_ANSI__ check from the __u64/__s64 declaration on 32bit targets. GCC can be made to warn about usage of long long types with ISO C90 (-ansi), but only with -pedantic. You can write this in a way that even then it doesn't cause warnings, namely by: #ifdef __GNUC__ __extension__ typedef __signed__ long long __s64; __extension__ typedef unsigned long long __u64; #endif The __extension__ keyword in front of this switches off any pedantic warnings for this expression. Signed-off-by:
Olaf Hering <olh@suse.de> Cc: <linux-arch@vger.kernel.org> Signed-off-by:
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Andi Drebes authored
The README file in the cramfs subdirectory says: "All data is currently in host-endian format; neither mkcramfs nor the kernel ever do swabbing." If somebody tries to mount a cramfs with the wrong endianess, cramfs only complains about a wrong magic but doesn't inform the user that only the endianess isn't right. The following patch adds an error message to the cramfs sources. If a user tries to mount a cramfs with the wrong endianess using the patched sources, cramfs will display the message "cramfs: wrong endianess". Signed-off-by:
Andi Drebes <lists-receive@programmierforen.de> Signed-off-by:
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Olaf Hering authored
include/linux/if_fddi.h is an exported header. It uses __be16. Include linux/types.h to get this prototype. Signed-off-by:
Olaf Hering <olaf@aepfle.de> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Signed-off-by:
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Miklos Szeredi authored
It looks like in the end all pruners want parents removed. So remove unused code and function arguments. Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Signed-off-by:
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Miklos Szeredi authored
vfs_permission(MAY_EXEC) checks if the filesystem is mounted with "noexec", so there's no need to repeat this check in sys_uselib() and open_exec(). Signed-off-by:
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Miklos Szeredi authored
permission() checks that MAY_EXEC is only allowed on regular files if at least one execute bit is set in the file mode. generic_permission() already ensures this, so the extra check in permission() is superfluous. If the filesystem defines it's own ->permission() the check may still be needed. In this case move it after ->permission(). This is needed because filesystems such as FUSE may need to refresh the inode attributes before checking permissions. This check should be moved inside ->permission(), but that's another story. Signed-off-by:
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Miklos Szeredi authored
utimensat() (and possibly other callers of do_utimes()) didn't check if the nanosecond value was within the allowed range. Signed-off-by:
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Subbaiah Venkata authored
Hello, I fixed and tested a small bug in lib/sort.c file, heap sort function. The fix avoids unnecessary swap of contents when i is 0 (saves few loads and stores), which happens every time sort function is called. I felt the fix is worth bringing it to your attention given the importance and frequent use of the sort function. Acked-by:
Matt Mackall <mpm@selenic.com> Signed-off-by:
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Olaf Hering authored
Remove linux/consolemap.h from make headers_install It contains no user interfaces. The defines in this file are used only for kernel internal state. Signed-off-by:
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Alan Cox authored
Remove some remaining vestiges of the old hacks jsm had to work around the old tty buffering. With the new tty buffering it simply doesn't matter any more. [michal.k.k.piotrowski@gmail.com: fix warning] Signed-off-by:
Alan Cox <alan@redhat.com> Acked-by:
Scott Kilau <scottk@digi.com> Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Signed-off-by:
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Alan Cox authored
We simply define it to the same value. Nowdays the TTY flip value is irrelevant but the value it used is as good as any so why risk breaking it Signed-off-by:
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Samuel Thibault authored
There have been issues with non-latin1 diacritics and unicode. http://bugzilla.kernel.org/show_bug.cgi?id=7746 Git 759448f4 `Kernel utf-8 handling' partly resolved it by adding conversion between diacritics and unicode. The patch below goes further by just turning diacritics into unicode, hence providing better future support. The kbd support can be fetched from http://bugzilla.kernel.org/attachment.cgi?id=12313 This was tested in all of latin1, latin9, latin2 and unicode with french and czech dead keys. Turn the kernel accent_table into unicode, and extend ioctls KDGKBDIACR and KDSKBDIACR into their equivalents KDGKBDIACRUC and KDSKBDIACR. New function int conv_uni_to_8bit(u32 uni) for converting unicode into 8bit _input_. No, we don't want to store the translation, as it is potentially sparse and large. Signed-off-by:
Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: Jan Engelhardt <jengelh@gmx.de> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Ed L. Cashin authored
We can just use skb_mac_header now, and we don't need a wrapper function to perform the cast. Instead of requiring the reader to check aoe.h to look up what an aoe_hdr function does, I'd rather do without it. Signed-off-by:
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Aneesh Kumar K.V authored
When a new block bitmap is read from disk in read_block_bitmap() there are a few bits that should ALWAYS be set. In particular, the blocks given by ext4_blk_bitmap, ext4_inode_bitmap and ext4_inode_table. Validate the block bitmap against these blocks. [akpm@linux-foundation.org: cleanups] Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
Andreas Dilger <adilger@clusterfs.com> Acked-by:
Mingming Cao <cmm@us.ibm.com> Signed-off-by:
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Roland McGrath authored
This adds the MMF_DUMP_ELF_HEADERS option to /proc/pid/coredump_filter. This dumps the first page (only) of a private file mapping if it appears to be a mapping of an ELF file. Including these pages in the core dump may give sufficient identifying information to associate the original DSO and executable file images and their debugging information with a core file in a generic way just from its contents (e.g. when those binaries were built with ld --build-id). I expect this to become the default behavior eventually. Existing versions of gdb can be confused by the core dumps it creates, so it won't enabled by default for some time to come. Soon many people will have systems with a gdb that handle these dumps, so they can arrange to set the bit at boot and have it inherited system-wide. This also cleans up the checking of the MMF_DUMP_* flag bits, which did not need to be using atomic macros. Signed-off-by:
Roland McGrath <roland@redhat.com> Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by:
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Olaf Hering authored
/usr/include/scsi is provided by glibc. Remove the scsi export from make headers_install target. Signed-off-by:
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Oleg Nesterov authored
The child was found on ->children list under tasklist_lock, it must have a valid ->signal. __exit_signal() both removes the task from parent->children and clears ->signal "atomically" under write_lock(tasklist). Remove unneeded checks. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Acked-by:
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Oleg Nesterov authored
Cleanup. __group_complete_signal() wakes up ->group_exit_task twice. The second wakeup's state includes TASK_UNINTERRUPTIBLE, which is not very appropriate. Change the code to pass the "correct" argument to signal_wake_up() and kill now unneeded wake_up_process(). Signed-off-by:
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Oleg Nesterov authored
The "p->exit_signal == -1 && p->ptrace == 0" check and the comment are bogus. We already did exactly the same check in eligible_child(), we did not drop tasklist_lock since then, and both variables need write_lock(tasklist) to be changed. Signed-off-by:
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Oleg Nesterov authored
Nowadays thread_group_empty() and next_thread() are simple list operations, this optimization doesn't make sense: we are doing exactly same check one line below. Signed-off-by:
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Oleg Nesterov authored
->siglock provides enough protection to iterate over the thread group. Signed-off-by:
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Oleg Nesterov authored
Two threads, T1 and T2. T2 ptraces P, and P is not a child of ptracer's thread group. P exits and goes to TASK_ZOMBIE. T1 does wait_task_zombie(P): P->exit_state = TASK_DEAD; ... read_unlock(&tasklist_lock); T2 does exit(), takes tasklist, forget_original_parent() does __ptrace_unlink(P) but doesn't call do_notify_parent(P) because p->exit_state == EXIT_DEAD. Now, P is not visible to our process: __ptrace_unlink() removed it from ->children. We should send notification to P->parent and release P if and only if SIGCHLD is ignored. And we have 3 bugs: 1. P->parent does do_wait() and gets -ECHILD (P is on ->parent->children, but its state is TASK_DEAD). 2. // wait_task_zombie() continues if (put_user(...)) { // TODO: is this safe? p->exit_state = EXIT_ZOMBIE; return; } we return without notification/release, task_struct leaked. Solution: ignore -EFAULT and proceed. It is an application's bug if we can't fill infop/stat_addr (in case of VM_FAULT_OOM we have much more problems). 3. // wait_task_zombie() continues if (p->real_parent != p->parent) { // Not taken, it was untraced'ed ... } release_task(p); we released the task which we shouldn't. Solution: check ->real_parent != ->parent before, under tasklist_lock, but use ptrace_unlink() instead of __ptrace_unlink() to check ->ptrace. This patch hopefully solves 2 and 3, the 1st bug will be fixed later, we need some cleanups in forget_original_parent/reparent_thread. However, the first race is very unlikely and not critical, so I hope it makes sense to fix 1 and 2 for now. 4. Small cleanup: don't "restore" EXIT_ZOMBIE unless we know we are not going to realease the child. Signed-off-by: -
Oleg Nesterov authored
A zombie must have a valid ->signal, we are going to release it and __exit_signal() starts with BUG_ON(!sig). Signed-off-by:
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Jesper Juhl authored
There's a small and unlikely memory leak in drivers/pnp/pnpbios/proc.c::proc_read_escd(). It's inside a sanity check, so it probably won't trigger often (if at all), however it *is* a potential leak and it's easy to avoid, so let's just fix it :) Signed-off-by:
Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by:
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Roland McGrath authored
This makes powerpc64's compat code use the new linux/elfcore-compat.h, reducing some hand-copied duplication. Signed-off-by:
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Roland McGrath authored
This adds the linux/elfcore-compat.h header file, which is the CONFIG_COMPAT analog of the linux/elfcore.h header. Each arch that needs to fake out fs/binfmt_elf.c for its compat code can use this header to replace the hand-copied definitions of the compat variants of struct elf_prstatus et al. Only the pr_reg field varies by arch, so asm/{compat,elf}.h must define compat_elf_gregset_t before linux/elfcore-compat.h can be used. It's a clean-up that every arch with compat core dumping code can benefit from. I only touched the ones I have handy to test at home. Doing the same for each other arch should be straightforward, and I'm happy to offer tips. Signed-off-by: -
Satyam Sharma authored
The current code skips the check to verify whether the filesystem was previously cleanly unmounted, if (flags & UFS_ST_MASK) == UFS_ST_44BSD or UFS_ST_OLD. This looks like an inadvertent bug that slipped in due to parantheses in the compound conditional to me, especially given that ufs_get_fs_state() handles the UFS_ST_44BSD case perfectly well. So, let's fix the compound condition appropriately. Signed-off-by:
Satyam Sharma <satyam@infradead.org> Cc: Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by:
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Christoph Hellwig authored
Move prototypes and in-core structures to fs/ufs/ similar to what most other filesystems already do. I made little modifications: move also ufs debug macros and mount options constants into fs/ufs/ufs.h, this stuff also private for ufs. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Evgeniy Dushistov <dushistov@mail.ru> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Alexey Dobriyan authored
Driver does proc_mkdir("ipmi", NULL); but remove_proc_entry(proc_ipmi_root->name, &proc_root); This is OK and working if only slightly inconsistent. Also changing proc_root to NULL will help OpenVZ which has multiple proc roots and, as we now know, requires matching parents in such cases. Signed-off-by:Alexey Dobriyan <adobriyan@sw.ru> Cc: Corey Minyard <minyard@acm.org> Signed-off-by:
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Oleg Nesterov authored
With or without this patch, multi-threaded init's are not fully supported, but do_exit() is completely wrong. This becomes a real problem when we support pid namespaces. 1. do_exit() panics when the main thread of /sbin/init exits. It should not until the whole thread group exits. Move the code below, under the "if (group_dead)" check. Note: this means that forget_original_parent() can use an already dead child_reaper()'s task_struct. This is OK for /sbin/init because - do_wait() from alive sub-thread still can reap a zombie, we iterate over all sub-thread's ->children lists - do_notify_parent() will wakeup some alive sub-thread because it sends the group-wide signal However, we should remove choose_new_parent()->BUG_ON(reaper->exit_state) for this. 2. We are playing games with ->nsproxy->pid_ns. This code is bogus today, and it has to be changed anyway when we really support pid namespaces, just remove it. Signed-off-by:
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