- 30 Apr, 2008 40 commits
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Miklos Szeredi authored
Fuse will use temporary buffers to write back dirty data from memory mappings (normal writes are done synchronously). This is needed, because there cannot be any guarantee about the time in which a write will complete. By using temporary buffers, from the MM's point if view the page is written back immediately. If the writeout was due to memory pressure, this effectively migrates data from a full zone to a less full zone. This patch adds a new counter (NR_WRITEBACK_TEMP) for the number of pages used as temporary buffers. [Lee.Schermerhorn@hp.com: add vmstat_text for NR_WRITEBACK_TEMP] Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by:
Lee Schermerhorn <lee.schermerhorn@hp.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Miklos Szeredi authored
Fuse needs this for writable mmap support. Signed-off-by:
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Miklos Szeredi authored
Add a new BDI capability flag: BDI_CAP_NO_ACCT_WB. If this flag is set, then don't update the per-bdi writeback stats from test_set_page_writeback() and test_clear_page_writeback(). Misc cleanups: - convert bdi_cap_writeback_dirty() and friends to static inline functions - create a flag that includes all three dirty/writeback related flags, since almst all users will want to have them toghether Signed-off-by:
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Miklos Szeredi authored
Move BDI statistics to debugfs: /sys/kernel/debug/bdi/<bdi>/stats Use postcore_initcall() to initialize the sysfs class and debugfs, because debugfs is initialized in core_initcall(). Update descriptions in ABI documentation. Signed-off-by:
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Peter Zijlstra authored
Add "max_ratio" to /sys/class/bdi. This indicates the maximum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in max_ratio_store(). - export bdi_set_max_ratio() to modules - limit bdi_dirty with bdi->max_ratio - document new sysfs attribute Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:
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Peter Zijlstra authored
Under normal circumstances each device is given a part of the total write-back cache that relates to its current avg writeout speed in relation to the other devices. min_ratio - allows one to assign a minimum portion of the write-back cache to a particular device. This is useful in situations where you might want to provide a minimum QoS. (One request for this feature came from flash based storage people who wanted to avoid writing out at all costs - they of course needed some pdflush hacks as well) max_ratio - allows one to assign a maximum portion of the dirty limit to a particular device. This is useful in situations where you want to avoid one device taking all or most of the write-back cache. Eg. an NFS mount that is prone to get stuck, or a FUSE mount which you don't trust to play fair. Add "min_ratio" to /sys/class/bdi. This indicates the minimum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in min_ratio_store() - document new sysfs attribute Signed-off-by:
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Miklos Szeredi authored
Register FUSE's backing_dev_info under sysfs with the name "fuse-MAJOR:MINOR" Make the fuse control filesystem use s_dev instead of a fuse specific ID. This makes it easier to match directories under /sys/fs/fuse/connections/ with directories under /sys/class/bdi, and with actual mounts. Signed-off-by:
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Miklos Szeredi authored
Register NFS' backing_dev_info under sysfs with the name "nfs-MAJOR:MINOR" Signed-off-by:
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Peter Zijlstra authored
Provide a place in sysfs (/sys/class/bdi) for the backing_dev_info object. This allows us to see and set the various BDI specific variables. In particular this properly exposes the read-ahead window for all relevant users and /sys/block/<block>/queue/read_ahead_kb should be deprecated. With patient help from Kay Sievers and Greg KH [mszeredi@suse.cz] - split off NFS and FUSE changes into separate patches - document new sysfs attributes under Documentation/ABI - do bdi_class_init as a core_initcall, otherwise the "default" BDI won't be initialized - remove bdi_init_fmt macro, it's not used very much [akpm@linux-foundation.org: fix ia64 warning] Signed-off-by:
Greg KH <greg@kroah.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by:
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Pavel Emelyanov authored
These values represent the nesting level of a namespace and pids living in it, and it's always non-negative. Turning this from int to unsigned int saves some space in pid.c (11 bytes on x86 and 64 on ia64) by letting the compiler optimize the pid_nr_ns a bit. E.g. on ia64 this removes the sign extension calls, which compiler adds to optimize access to pid->nubers[ns->level]. Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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Adrian Bunk authored
With the needlessly global marker_debug being static gcc can optimize the unused code away. Signed-off-by:
Adrian Bunk <bunk@kernel.org> Acked-by:
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Christoph Hellwig authored
Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Signed-off-by:
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Oleg Nesterov authored
1. sys_getpgid() needs rcu_read_lock() to derive the pgrp _nr, even if the task is current, otherwise we can race with another thread which does sys_setpgid(). 2. Use rcu_read_lock() instead of tasklist_lock when pid != 0, make sure that we don't use the NULL pid if the task exits right after successful find_task_by_vpid(). Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
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Oleg Nesterov authored
1. sys_getsid() needs rcu_read_lock() to derive the session _nr, even if the task is current, otherwise we can race with another thread which does sys_setsid(). 2. The task can exit between find_task_by_vpid() and task_session_vnr(), in that unlikely case sys_getsid() returns 0 instead of -ESRCH. Signed-off-by:
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Oleg Nesterov authored
Use change_pid() instead of detach_pid() + attach_pid() in __set_special_pids(). This way task_session() is not NULL in between. Signed-off-by:
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Oleg Nesterov authored
Use change_pid() instead of detach_pid() + attach_pid() in sys_setpgid(). This way task_pgrp() is not NULL in between. Signed-off-by:
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Oleg Nesterov authored
Based on Eric W. Biederman's idea. Without tasklist_lock held task_session()/task_pgrp() can return NULL if the caller races with setprgp()/setsid() which does detach_pid() + attach_pid(). This can happen even if task == current. Intoduce the new helper, change_pid(), which should be used instead. This way the caller always sees the special pid != NULL, either old or new. Also change the prototype of attach_pid(), it always returns 0 and nobody check the returned value. Signed-off-by:
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Oleg Nesterov authored
Based on Eric W. Biederman's idea. Unless task == current, without tasklist_lock held task_session()/task_pgrp() can return NULL if the caller races with de_thread() which switches the group leader. Change transfer_pid() to not clear old->pids[type].pid for the old leader. This means that its .pid can point to "nowhere", but this is already true for sub-threads, and the old leader is not group_leader() any longer. IOW, with or without this change we can't trust task's special pids unless it is the group leader. With this change the following code rcu_read_lock(); task = find_task_by_xxx(); do_something(task_pgrp(task), task_session(task)); rcu_read_unlock(); can't race with exec and hit the NULL pid. Signed-off-by:
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Pavel Emelyanov authored
There are some places that are known to operate on tasks' global pids only: * the rest_init() call (called on boot) * the kgdb's getthread * the create_kthread() (since the kthread is run in init ns) So use the find_task_by_pid_ns(..., &init_pid_ns) there and schedule the find_task_by_pid for removal. [sukadev@us.ibm.com: Fix warning in kernel/pid.c] Signed-off-by:
Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by:
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Pavel Emelyanov authored
The pid to lookup a task by is passed inside taskstats code via genetlink message. Since netlink packets are now processed in the context of the sending task, this is correct to lookup the task with find_task_by_vpid() here. Besides, I fix the call to fill_pid() from taskstats_exit(), since the tsk->pid is not required in fill_pid() in this case, and the pid field on task_struct is going to be deprecated as well. Signed-off-by:
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Oleg Nesterov authored
The callers of free_pidmap() pass 2 members of "struct upid", we can just pass "struct upid *" instead. Shaves off 10 bytes from pid.o. Also, simplify the alloc_pid's "out_free:" error path a little bit. This way it looks more clear which subset of pid->numbers[] we are freeing. Signed-off-by:
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Sukadev Bhattiprolu authored
Factor out the code used to allocate/free a pts index into new interfaces, devpts_new_index() and devpts_kill_index(). This localizes the external data structures used in managing the pts indices. [akpm@linux-foundation.org: undo accidental mutex2sem conversion] Signed-off-by:
Serge Hallyn <serue@us.ibm.com> Signed-off-by:
Matt Helsley <matthltc@us.ibm.com> Acked-by:
H. Peter Anvin <hpa@zytor.com> Signed-off-by:
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Sukadev Bhattiprolu authored
Have ptmx_open() propagate any error code returned by devpts_pty_new() (which returns either 0 or -ENOMEM anyway). Signed-off-by:
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Hiroshi Shimamoto authored
At ptmx_open(), the 2nd parameter for check_tty_count() should be "ptmx_open". Signed-off-by:
Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Acked-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Alan Cox authored
Simple search/replace except for synclink.c where I noticed a real bug and fixed it too. It was doing NULL + offset, then checking for NULL if the remap failed. Signed-off-by:
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Alan Cox authored
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Alan Cox authored
Something Arjan suggested which allows us to clean up the code nicely Signed-off-by:
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Alan Cox authored
Fix the rather strange buffer management on open that turned up while auditing for BKL dependencies. Signed-off-by:
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Alan Cox authored
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Alan Cox authored
Clean up the epca driver Signed-off-by:
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Alan Cox authored
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Alan Cox authored
- Use the tty baud functions - Call driver termios methods directly holding the right locking - Check for a write method Signed-off-by:
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Alan Cox authored
- Operations are now a shared const function block as with most other Linux objects - Introduce wrappers for some optional functions to get consistent behaviour - Wrap put_char which used to be patched by the tty layer - Document which functions are needed/optional - Make put_char report success/fail - Cache the driver->ops pointer in the tty as tty->ops - Remove various surplus lock calls we no longer need - Remove proc_write method as noted by Alexey Dobriyan - Introduce some missing sanity checks where certain driver/ldisc combinations would oops as they didn't check needed methods were present [akpm@linux-foundation.org: fix fs/compat_ioctl.c build] [akpm@linux-foundation.org: fix isicom] [akpm@linux-foundation.org: fix arch/ia64/hp/sim/simserial.c build] [akpm@linux-foundation.org: fix kgdb] Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by:
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Alan Cox authored
[akpm@linux-foundation.org: fix arm, cleanups] Signed-off-by:
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Alan Cox authored
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Alan Cox authored
This driver somehow escaped the tty operations changes way back when. Update it so that we can switch to tty->ops shortly. Signed-off-by:
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Alan Cox authored
We are about to change the tty layer to avoid keeping private copies of all the methods in each tty. We have to update the pty layer first as it currently patches the ioctl method according to the tty type. Use multiple tty operations sets instead. Signed-off-by:
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Alan Cox authored
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Karsten Keil <kkeil@suse.de> Signed-off-by:
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Alan Cox authored
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Alan Cox authored
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