- 18 Jun, 2009 40 commits
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Oleg Nesterov authored
In theory it is not safe to dereference ->parent/real_parent without tasklist or rcu lock, we can race with re-parenting. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Acked-by:
Roland McGrath <roland@redhat.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Oleg Nesterov authored
The forked child can have TIF_SIGPENDING if it was copied from parent's ti->flags. But this is harmless and actually almost never happens, because copy_process() can't succeed if signal_pending() == T. Signed-off-by:
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Oleg Nesterov authored
There is no reason for thread_group_cputime() in wait_task_zombie(), there must be no other threads. This call was previously needed to collect the per-cpu data which we do not have any longer. Signed-off-by:
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Oleg Nesterov authored
Change ptrace_getsiginfo/ptrace_setsiginfo to use lock_task_sighand() without tasklist_lock. Perhaps it makes sense to make a single helper with "bool rw" argument. Signed-off-by:
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Oleg Nesterov authored
If the non-traced sub-thread calls do_notify_parent_cldstop(), we send the notification to group_leader->real_parent and we report group_leader's pid. But, if group_leader is traced we use the wrong ->parent->nsproxy->pid_ns, the tracer and parent can live in different namespaces. Change the code to use "parent" instead of tsk->parent. Signed-off-by:
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by:
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Oleg Nesterov authored
Change wait_task_zombie() to use ->real_parent instead of ->parent. We could even use current afaics, but ->real_parent is more clean. We know that the child is not ptrace_reparented() and thus they are equal. But we should avoid using task_struct->parent, we are going to remove it. Signed-off-by:
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Oleg Nesterov authored
- Use rcu_read_lock() instead of tasklist_lock to find/get the task in ptrace_get_task_struct(). - Make it static, it has no callers outside of ptrace.c. - The comment doesn't match the reality, this helper does not do any checks. Beacuse it is really trivial and static I removed the whole comment. Signed-off-by:
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Oleg Nesterov authored
Remove the "Nasty, nasty" lock dance in ptrace_attach()/ptrace_traceme() - from now task_lock() has nothing to do with ptrace at all. With the recent changes nobody uses task_lock() to serialize with ptrace, but in fact it was never needed and it was never used consistently. However ptrace_attach() calls __ptrace_may_access() and needs task_lock() to pin task->mm for get_dumpable(). But we can call __ptrace_may_access() before we take tasklist_lock, ->cred_exec_mutex protects us against do_execve() path which can change creds and MMF_DUMP* flags. (ugly, but we can't use ptrace_may_access() because it hides the error code, so we have to take task_lock() and use __ptrace_may_access()). NOTE: this change assumes that LSM hooks, security_ptrace_may_access() and security_ptrace_traceme(), can be called without task_lock() held. Signed-off-by:
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Oleg Nesterov authored
ptrace_attach() and ptrace_traceme() are the last functions which look as if the untraced task can have task->ptrace != 0, this must not be possible. Change the code to just check ->ptrace != 0 and s/|=/=/ to set PT_PTRACED. Also, a couple of trivial whitespace cleanups in ptrace_attach(). And move ptrace_traceme() up near ptrace_attach() to keep them close to each other. Signed-off-by:
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Oleg Nesterov authored
- Add PF_KTHREAD check to prevent attaching to the kernel thread with a borrowed ->mm. With or without this change we can race with daemonize() which can set PF_KTHREAD or clear ->mm after ptrace_attach() does the check, but this doesn't matter because reparent_to_kthreadd() does ptrace_unlink(). - Kill "!task->mm" check. We don't really care about ->mm != NULL, and the task can call exit_mm() right after we drop task_lock(). What we need is to make sure we can't attach after exit_notify(), check task->exit_state != 0 instead. Also, move the "already traced" check down for cosmetic reasons. Signed-off-by:
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Oleg Nesterov authored
No functional changes. - Nobody except ptrace.c & co should use ptrace flags directly, we have task_ptrace() for that. - No need to specially check PT_PTRACED, we must not have other PT_ bits set without PT_PTRACED. And no need to know this flag exists. Signed-off-by:
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Oleg Nesterov authored
tracehook_unsafe_exec() doesn't need task_lock(), remove the old comment. Signed-off-by:
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Oleg Nesterov authored
"Search in the siblings" should use ->real_parent, not ->parent. If the task is traced then ->parent == tracer, while the task's parent is always ->real_parent. Signed-off-by:
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Oleg Nesterov authored
m32r: PTRACE_SINGLESTEP sets PT_DTRACE, it is never used except cleared after do_execve(). Signed-off-by:
Hirokazu Takata <takata@linux-m32r.org> Acked-by:
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Oleg Nesterov authored
m68k sets PT_DTRACE in trap_c() but never uses it. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Acked-by:
Greg Ungerer <gerg@snapgear.com> Cc: Roman Zippel <zippel@linux-m68k.org> Acked-by:
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Oleg Nesterov authored
avr32, mn10300, parisc, s390, sh, xtensa: They never set PT_DTRACE, but clear it after do_execve(). Signed-off-by:
Kyle McMartin <kyle@mcmartin.ca> Cc: Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <matthew@wil.cx> Acked-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by:
Paul Mundt <lethal@linux-sh.org> Acked-by:
Chris Zankel <chris@zankel.net> Acked-by:
Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by:
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Oleg Nesterov authored
h8300 defines PT_DTRACE for asm but never uses it. DEFINE(PT_PTRACED, PT_PTRACED) seems to be unused too. Signed-off-by:
Yoshinori Sato <ysato@users.sourceforge.jp> Acked-by:
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Oleg Nesterov authored
allow_signal() checks ->mm == NULL. Not sure why. Perhaps to make sure current is the kernel thread. But this helper must not be used unless we are the kernel thread, kill this check. Also, document the fact that the CLONE_SIGHAND kthread must not use allow_signal(), unless the caller really wants to change the parent's ->sighand->action as well. Signed-off-by:
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KAMEZAWA Hiroyuki authored
Try to fix memcg's lru rotation sanity: make memcg use the same logic as the global LRU does. Now, at __isolate_lru_page() retruns -EBUSY, the page is rotated to the tail of LRU in global LRU's isolate LRU pages. But in memcg, it's not handled. This makes memcg do the same behavior as global LRU and rotate LRU in the page is busy. Signed-off-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by:
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by:
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Daisuke Nishimura authored
We don't have an interface to reset mem.limit or memsw.limit now. This patch allows to reset mem.limit or memsw.limit when they are being set to -1. Signed-off-by:
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KAMEZAWA Hiroyuki authored
A user can set memcg.limit_in_bytes == memcg.memsw.limit_in_bytes when the user just want to limit the total size of applications, in other words, not very interested in memory usage itself. In this case, swap-out will be done only by global-LRU. But, under current implementation, memory.limit_in_bytes is checked at first and try_to_free_page() may do swap-out. But, that swap-out is useless for memsw.limit_in_bytes and the thread may hit limit again. This patch tries to fix the current behavior at memory.limit == memsw.limit case. And documentation is updated to explain the behavior of this special case. Signed-off-by:
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KAMEZAWA Hiroyuki authored
This patch fixes mis-accounting of swap usage in memcg. In the current implementation, memcg's swap account is uncharged only when swap is completely freed. But there are several cases where swap cannot be freed cleanly. For handling that, this patch changes that memcg uncharges swap account when swap has no references other than cache. By this, memcg's swap entry accounting can be fully synchronous with the application's behavior. This patch also changes memcg's hooks for swap-out. Signed-off-by:
Balbir Singh <balbir@in.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by:
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Li Zefan authored
This forward declaration seems pointless. Signed-off-by:
Li Zefan <lizf@cn.fujitsu.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by:
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Li Zefan authored
We don't need to check do_swap_account in the case that the function which checks do_swap_account will never get called if do_swap_account == 0. Signed-off-by:
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Daisuke Nishimura authored
mem_cgroup_cache_charge_swapin() isn't used any more, so remove no-op definition of it in header file. Signed-off-by:
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Balbir Singh authored
Add file RSS tracking per memory cgroup We currently don't track file RSS, the RSS we report is actually anon RSS. All the file mapped pages, come in through the page cache and get accounted there. This patch adds support for accounting file RSS pages. It should 1. Help improve the metrics reported by the memory resource controller 2. Will form the basis for a future shared memory accounting heuristic that has been proposed by Kamezawa. Unfortunately, we cannot rename the existing "rss" keyword used in memory.stat to "anon_rss". We however, add "mapped_file" data and hope to educate the end user through documentation. [hugh.dickins@tiscali.co.uk: fix mem_cgroup_update_mapped_file_stat oops] Signed-off-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by:
Hugh Dickins <hugh.dickins@tiscali.co.uk> Signed-off-by:
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Li Zefan authored
While walking through the whitelist, if the DEV_ALL item is found, no more check is needed. Signed-off-by:
Serge Hallyn <serue@us.ibm.com> Signed-off-by:
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Li Zefan authored
The 'noprefix' option was introduced for backwards-compatibility of cpuset, but actually it can be used when mounting other subsystems. This results in possibility of name collision, and now the collision can really happen, because we have 'stat' file in both memory and cpuacct subsystem: # mount -t cgroup -o noprefix,memory,cpuacct xxx /mnt Cgroup will happily mount the 2 subsystems, but only 'stat' file of memory subsys can be seen. We don't want users to use nopreifx, and also want to avoid name collision, so we change to allow noprefix only if mounting just the cpuset subsystem. [akpm@linux-foundation.org: fix shift for cpuset_subsys_id >= 32] Signed-off-by:
Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by:
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Randy Dunlap authored
Fix some cgroup messages to read better. Update MAINTAINERS to include mm/*cgroup* files. Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Cc: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by:
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Jaswinder Singh Rajput authored
Currently cn_test_want_notify() has no user. So add an ifdef and a comment which tells us to not remove it. Signed-off-by:
Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Acked-by:
Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by:
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Jose Luis Perez Diez authored
Perl is used on the kernel Makefile to generate documentation, firmwares in c source form, sources, graphs, and some headers and this fact is undocumented. [akpm@linux-foundation.org: 80-columns, please] Signed-off-by:
Jose Luis Perez Diez <jluis@escomposlinux.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by:
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Jeff Mahoney authored
Several code paths in reiserfs have a construct like: if (is_direntry_le_ih(ih = B_N_PITEM_HEAD(src, item_num))) ... which, in addition to being ugly, end up causing compiler warnings with gcc 4.4.0. Previous compilers didn't issue a warning. fs/reiserfs/do_balan.c:1273: warning: operation on `aux_ih' may be undefined fs/reiserfs/lbalance.c:393: warning: operation on `ih' may be undefined fs/reiserfs/lbalance.c:421: warning: operation on `ih' may be undefined fs/reiserfs/lbalance.c:777: warning: operation on `ih' may be undefined I believe this is due to the ih being passed to macros which evaluate the argument more than once. This is old code and we haven't seen any problems with it, but this patch eliminates the warnings. It converts the multiple evaluation macros to static inlines and does a preassignment for the cases that were causing the warnings because that code is just ugly. Reported-by:
Chris Mason <mason@oracle.com> Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Signed-off-by:
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Roel Kluin authored
unsigned i_block,fragment cannot be negative. Signed-off-by:
Roel Kluin <roel.kluin@gmail.com> Signed-off-by:
Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by:
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Jan Kara authored
Remove unused variables from isofs_sb_info (used to be some mount options), unify variables for option to use 0/1 (some options used 'y'/'n'), use bit fields for option flags in superblock. Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Jan Kara authored
isofs allows setting of default uid and gid of files but value 0 was used to indicate that user did not specify any uid/gid mount option. Since this option also overrides uid/gid set in Rock Ridge extension, it makes sense to allow forcing uid/gid 0. Fix option processing to allow this. Cc: <Hans-Joachim.Baader@cjt.de> Signed-off-by:
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Jan Kara authored
So far, permissions set via 'mode' and/or 'dmode' mount options were effective only if the medium had no rock ridge extensions (or was mounted without them). Add 'overriderockmode' mount option to indicate that these options should override permissions set in rock ridge extensions. Maybe this should be default but the current behavior is there since mount options were created so I think we should not change how they behave. Cc: <Hans-Joachim.Baader@cjt.de> Signed-off-by:
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Jan Kara authored
As Ted pointed out, it can happen that ext3_truncate() returns without removing inode from orphan list. This way we could in some rare cases (like when we get ENOMEM from an allocation in ext3_truncate called because of failed ext3_write_begin) leave the inode on orphan list and that triggers assertion failure on umount. So make ext3_truncate() always remove inode from in-memory orphan list. Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Hisashi Hifumi authored
I delete the following patch "commit 3f31fddf Author: Mingming Cao <cmm@us.ibm.com> Date: Fri Jul 25 01:46:22 2008 -0700 jbd: fix race between free buffer and commit transaction This patch is no longer needed because if race between freeing buffer and committing transaction functionality occurs and dio gets error, currently dio falls back to buffered IO by the following patch. commit 6ccfa806 Author: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> Date: Tue Sep 2 14:35:40 2008 -0700 VFS: fix dio write returning EIO when try_to_release_page fails Signed-off-by:
Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> Cc: Theodore Tso <tytso@mit.edu> Cc: Mingming Cao <cmm@us.ibm.com> Acked-by:
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Jan Kara authored
Chain verification in ext3_get_blocks() has been hosed since it called verify_chain(chain, NULL) which always returns success. As a result readers could in theory race with truncate. On the other hand the race probably cannot happen with the current locking scheme, since by the time ext3_truncate() is called all the pages are already removed and hence get_block() shouldn't be called on such pages... Signed-off-by:
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Michael Shields authored
ext2.txt says that dirs can have 32,768 subdirs, but the actual value of EXT2_LINK_MAX is 32000. ext3 is the same, but the doc does not mention it. One of ext4's features is to "fix 32000 subdirectory limit". Signed-off-by:
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