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2007-10-22efs: new export opsChristoph Hellwig
Trivial switch over to the new generic helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22ext4: new export opsChristoph Hellwig
Trivial switch over to the new generic helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22ext3: new export opsChristoph Hellwig
Trivial switch over to the new generic helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22ext2: new export opsChristoph Hellwig
Trivial switch over to the new generic helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22exportfs: add new methodsChristoph Hellwig
Add the guts for the new filesystem API to exportfs. There's now a fh_to_dentry method that returns a dentry for the object looked for given a filehandle fragment, and a fh_to_parent operation that returns the dentry for the encoded parent directory in case the file handle contains it. There are default implementations for these methods that only take a callback for an nfs-enhanced iget variant and implement the rest of the semantics. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: <linux-ext4@vger.kernel.org> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: David Chinner <dgc@sgi.com> Cc: Timothy Shimmin <tes@sgi.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: Chris Mason <mason@suse.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: "Vladimir V. Saveliev" <vs@namesys.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22exportfs: add fid typeChristoph Hellwig
This patchset is a medium scale rewrite of the export operations interface. The goal is to make the interface less complex, and easier to understand from the filesystem side, aswell as preparing generic support for exporting of 64bit inode numbers. This touches all nfs exporting filesystems, and I've done testing on all of the filesystems I have here locally (xfs, ext2, ext3, reiserfs, jfs) This patch: Add a structured fid type so that we don't have to pass an array of u32 values around everywhere. It's a union of possible layouts. As a start there's only the u32 array and the traditional 32bit inode format, but there will be more in one of my next patchset when I start to document the various filehandle formats we have in lowlevel filesystems better. Also add an enum that gives the various filehandle types human- readable names. Note: Some people might think the struct containing an anonymous union is ugly, but I didn't want to pass around a raw union type. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Neil Brown <neilb@suse.de> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: <linux-ext4@vger.kernel.org> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: David Chinner <dgc@sgi.com> Cc: Timothy Shimmin <tes@sgi.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: Chris Mason <mason@suse.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: "Vladimir V. Saveliev" <vs@namesys.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22ext2: avoid rec_len overflow with 64KB block sizeJan Kara
With 64KB blocksize, a directory entry can have size 64KB which does not fit into 16 bits we have for entry length. So we store 0xffff instead and convert the value when read from / written to disk. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Jan Kara <jack@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-22dcache: don't expose uninitialized memory in /proc/<pid>/fd/<fd>J. Bruce Fields
Well, it's not especially important that target->d_iname get the contents of dentry->d_iname, but it's important that it get initialized with *something*, otherwise we're just exposing some random piece of memory to anyone who reads the link at /proc/<pid>/fd/<fd> for the deleted file, when it's still held open by someone. I've run a test program that copies a short (<36 character) name ontop of a long (>=36 character) name and see that the first time I run it, without this patch, I get unpredicatable results out of /proc/<pid>/fd/<fd>. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-21NFS: Fix a typo in nfs_call_unlink()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-21NFSv2: Ensure that the directory metadata gets revalidated on file createTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-21Merge branch 'audit.b43' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current * 'audit.b43' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current: [PATCH] audit: watching subtrees [PATCH] new helper - inotify_evict_watch() [PATCH] new helper - inotify_clone_watch() [PATCH] new helpers - collect_mounts() and release_collected_mounts() [PATCH] pass dentry to audit_inode()/audit_inode_child()
2007-10-21nobh: nobh_write_end fixNick Piggin
This path mustn't have been tested :( I did attempt to exercise it by injecting failures here, but I suspect PageMappedToDisk may have been getting in the way. Will need more of a look, although I think nobh mode is OK for an -rc1 (it shouldn't eat anyone's data). Commit 03158cd7eb3374843de68421142ca5900df845d9 ("fs: restore nobh") introcduced a NULL deref. Spotted by the Coverity checker. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-21[PATCH] audit: watching subtreesAl Viro
New kind of audit rule predicates: "object is visible in given subtree". The part that can be sanely implemented, that is. Limitations: * if you have hardlink from outside of tree, you'd better watch it too (or just watch the object itself, obviously) * if you mount something under a watched tree, tell audit that new chunk should be added to watched subtrees * if you umount something in a watched tree and it's still mounted elsewhere, you will get matches on events happening there. New command tells audit to recalculate the trees, trimming such sources of false positives. Note that it's _not_ about path - if something mounted in several places (multiple mount, bindings, different namespaces, etc.), the match does _not_ depend on which one we are using for access. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-10-21[PATCH] new helper - inotify_evict_watch()Al Viro
Kicks the watch out without dropping it. Called under ->inotify_mutex Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-10-21[PATCH] new helper - inotify_clone_watch()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-10-21[PATCH] new helpers - collect_mounts() and release_collected_mounts()Al Viro
Get a snapshot of a subtree, creating private clones of vfsmounts for all its components and release such snapshot resp. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-10-21[PATCH] pass dentry to audit_inode()/audit_inode_child()Al Viro
makes caller simpler *and* allows to scan ancestors Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-10-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivialLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial: (74 commits) fix do_sys_open() prototype sysfs: trivial: fix sysfs_create_file kerneldoc spelling mistake Documentation: Fix typo in SubmitChecklist. Typo: depricated -> deprecated Add missing profile=kvm option to Documentation/kernel-parameters.txt fix typo about TBI in e1000 comment proc.txt: Add /proc/stat field small documentation fixes Fix compiler warning in smount example program from sharedsubtree.txt docs/sysfs: add missing word to sysfs attribute explanation documentation/ext3: grammar fixes Documentation/java.txt: typo and grammar fixes Documentation/filesystems/vfs.txt: typo fix include/asm-*/system.h: remove unused set_rmb(), set_wmb() macros trivial copy_data_pages() tidy up Fix typo in arch/x86/kernel/tsc_32.c file link fix for Pegasus USB net driver help remove unused return within void return function Typo fixes retrun -> return x86 hpet.h: remove broken links ...
2007-10-19Avoid compile error in fs/nfs/unlink.cLinus Torvalds
Erez Zadok reports that certain configurations fail to build due to schedule() TASK_[UN]INTERRUPTIBLE not being declared. Add proper include files to fix. Cc: Erez Zadok <ezk@cs.sunysb.edu> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19nfs: Fix build break with CONFIG_NFS_V4=nOlof Johansson
Signed-off-by: Olof Johansson <olof@lixom.net> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-20sysfs: trivial: fix sysfs_create_file kerneldoc spelling mistakeChris Malley
Spelling error in sysfs_create_file kerneldoc. Signed-off-by: Chris Malley <mail@chrismalley.co.uk> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-20fix typo "insted" -> "instead"Uwe Kleine-König
Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-19Merge git://git.linux-nfs.org/pub/linux/nfs-2.6Linus Torvalds
* git://git.linux-nfs.org/pub/linux/nfs-2.6: NFSv4: Fix an rpc_cred reference leakage in fs/nfs/delegation.c NFSv4: Ensure that we wait for the CLOSE request to complete NFS: Fix a race in sillyrename NFS: Fix a writeback race...
2007-10-19Convert files to UTF-8 and some cleanupsJan Engelhardt
* Convert files to UTF-8. * Also correct some people's names (one example is Eißfeldt, which was found in a source file. Given that the author used an ß at all in a source file indicates that the real name has in fact a 'ß' and not an 'ss', which is commonly used as a substitute for 'ß' when limited to 7bit.) * Correct town names (Goettingen -> Göttingen) * Update Eberhard Mönkeberg's address (http://lkml.org/lkml/2007/1/8/313) Signed-off-by: Jan Engelhardt <jengelh@gmx.de> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-19NFSv4: Fix an rpc_cred reference leakage in fs/nfs/delegation.cTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFSv4: Ensure that we wait for the CLOSE request to completeTrond Myklebust
Otherwise, we do end up breaking close-to-open semantics. We also end up breaking some of the silly-rename tests in Connectathon on some setups. Please refer to the bug-report at http://bugzilla.linux-nfs.org/show_bug.cgi?id=150 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFS: Fix a race in sillyrenameTrond Myklebust
lookup() and sillyrename() can race one another because the sillyrename() completion cannot take the parent directory's inode->i_mutex since the latter may be held by whoever is calling dput(). We therefore have little option but to add extra locking to ensure that nfs_lookup() and nfs_atomic_open() do not race with the sillyrename completion. If somebody has looked up the sillyrenamed file in the meantime, we just transfer the sillydelete information to the new dentry. Please refer to the bug-report at http://bugzilla.linux-nfs.org/show_bug.cgi?id=150 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19NFS: Fix a writeback race...Trond Myklebust
This patch fixes a regression that was introduced by commit 44dd151d5c21234cc534c47d7382f5c28c3143cd We cannot zero the user page in nfs_mark_uptodate() any more, since a) We'd be modifying the page without holding the page lock b) We can race with other updates of the page, most notably because of the call to nfs_wb_page() in nfs_writepage_setup(). Instead, we do the zeroing in nfs_update_request() if we see that we're creating a request that might potentially be marked as up to date. Thanks to Olivier Paquet for reporting the bug and providing a test-case. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-10-19Fix misspellings of "system", "controller", "interrupt" and "necessary".Robert P. J. Day
Fix the various misspellings of "system", controller", "interrupt" and "[un]necessary". Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-schedLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched: sched: fix guest time accounting going faster than user time accounting
2007-10-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: (51 commits) [CIFS] log better errors on failed mounts [CIFS] Return better error when server requires signing but client forbids [CIFS] fix typo [CIFS] acl support part 4 [CIFS] Fix minor problems noticed by scan [CIFS] fix bad handling of EAGAIN error on kernel_recvmsg in cifs_demultiplex_thread [CIFS] build break [CIFS] endian fixes [CIFS] endian fixes in new acl code [CIFS] Fix some endianness problems in new acl code [CIFS] missing #endif from a previous patch [CIFS] formatting fixes [CIFS] Break up unicode_sessetup string functions [CIFS] parse server_GUID in SPNEGO negProt response [CIFS] [CIFS] Fix endian conversion problem in posix mkdir [CIFS] fix build break when lanman not enabled [CIFS] remove two sparse warnings [CIFS] remove compile warnings when debug disabled [CIFS] CIFS ACL support part 3 ...
2007-10-19Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6Linus Torvalds
* 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6: [XFS] cleanup fid types mess [XFS] fixups after behavior removal merge into mainline git
2007-10-19Use task_pid_nr() instead of pid_nr(task_pid())Pavel Emelyanov
There are two places that do so - the cgroups subsystem and the autofs code. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Ian Kent <raven@themaw.net> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Remove unused variables from fs/proc/base.cPavel Emelyanov
When removing the explicit task_struct->pid usage I found that proc_readfd_common() and proc_pident_readdir() get this field, but do not use it at all. So this cleanup is a cheap help with the task_struct->pid isolation. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Use helpers to obtain task pid in printksPavel Emelyanov
The task_struct->pid member is going to be deprecated, so start using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in the kernel. The first thing to start with is the pid, printed to dmesg - in this case we may safely use task_pid_nr(). Besides, printks produce more (much more) than a half of all the explicit pid usage. [akpm@linux-foundation.org: git-drm went and changed lots of stuff] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Dave Airlie <airlied@linux.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Fix tsk->exit_state usageEugene Teo
tsk->exit_state can only be 0, EXIT_ZOMBIE, or EXIT_DEAD. A non-zero test is the same as tsk->exit_state & (EXIT_ZOMBIE | EXIT_DEAD), so just testing tsk->exit_state is sufficient. Signed-off-by: Eugene Teo <eugeneteo@kernel.sg> Cc: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19proc: export a processes resource limits via /proc/pidNeil Horman
Currently, there exists no method for a process to query the resource limits of another process. They can be inferred via some mechanisms but they cannot be explicitly determined. Given that this information can be usefull to know during the debugging of an application, I've written this patch which exports all of a processes limits via /proc/<pid>/limits. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19fs/select, remove unused macrosJiri Slaby
fs/select, remove unused macros this is due to preparation for global BIT macro Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Isolate some explicit usage of task->tgidPavel Emelyanov
With pid namespaces this field is now dangerous to use explicitly, so hide it behind the helpers. Also the pid and pgrp fields o task_struct and signal_struct are to be deprecated. Unfortunately this patch cannot be sent right now as this leads to tons of warnings, so start isolating them, and deprecate later. Actually the p->tgid == pid has to be changed to has_group_leader_pid(), but Oleg pointed out that in case of posix cpu timers this is the same, and thread_group_leader() is more preferable. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19Uninline find_task_by_xxx set of functionsPavel Emelyanov
The find_task_by_something is a set of macros are used to find task by pid depending on what kind of pid is proposed - global or virtual one. All of them are wrappers above the most generic one - find_task_by_pid_type_ns() - and just substitute some args for it. It turned out, that dereferencing the current->nsproxy->pid_ns construction and pushing one more argument on the stack inline cause kernel text size to grow. This patch moves all this stuff out-of-line into kernel/pid.c. Together with the next patch it saves a bit less than 400 bytes from the .text section. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: changes to show virtual ids to userPavel Emelyanov
This is the largest patch in the set. Make all (I hope) the places where the pid is shown to or get from user operate on the virtual pids. The idea is: - all in-kernel data structures must store either struct pid itself or the pid's global nr, obtained with pid_nr() call; - when seeking the task from kernel code with the stored id one should use find_task_by_pid() call that works with global pids; - when showing pid's numerical value to the user the virtual one should be used, but however when one shows task's pid outside this task's namespace the global one is to be used; - when getting the pid from userspace one need to consider this as the virtual one and use appropriate task/pid-searching functions. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: nuther build fix] [akpm@linux-foundation.org: yet nuther build fix] [akpm@linux-foundation.org: remove unneeded casts] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: initialize the namespace's proc_mntPavel Emelyanov
The namespace's proc_mnt must be kern_mount-ed to make this pointer always valid, independently of whether the user space mounted the proc or not. This solves raced in proc_flush_task, etc. with the proc_mnt switching from NULL to not-NULL. The initialization is done after the init's pid is created and hashed to make proc_get_sb() finr it and get for root inode. Sice the namespace holds the vfsmnt, vfsmnt holds the superblock and the superblock holds the namespace we must explicitly break this circle to destroy all the stuff. This is done after the init of the namespace dies. Running a few steps forward - when init exits it will kill all its children, so no proc_mnt will be needed after its death. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: make proc_flush_task() actually from entries from multiple ↵Pavel Emelyanov
namespaces This means that proc_flush_task_mnt() is to be called for many proc mounts and with different ids, depending on the namespace this pid is to be flushed from. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: make proc have multiple superblocks - one for each namespacePavel Emelyanov
Each pid namespace have to be visible through its own proc mount. Thus we need to have per-namespace proc trees with their own superblocks. We cannot easily show different pid namespace via one global proc tree, since each pid refers to different tasks in different namespaces. E.g. pid 1 refers to the init task in the initial namespace and to some other task when seeing from another namespace. Moreover - pid, exisintg in one namespace may not exist in the other. This approach has one move advantage is that the tasks from the init namespace can see what tasks live in another namespace by reading entries from another proc tree. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: helpers to find the task by its numerical idsPavel Emelyanov
When searching the task by numerical id on may need to find it using global pid (as it is done now in kernel) or by its virtual id, e.g. when sending a signal to a task from one namespace the sender will specify the task's virtual id and we should find the task by this value. [akpm@linux-foundation.org: fix gfs2 linkage] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: prepare proc_flust_task() to flush entries from multiple ↵Pavel Emelyanov
proc trees The first part is trivial - we just make the proc_flush_task() to operate on arbitrary vfsmount with arbitrary ids and pass the pid and global proc_mnt to it. The other change is more tricky: I moved the proc_flush_task() call in release_task() higher to address the following problem. When flushing task from many proc trees we need to know the set of ids (not just one pid) to find the dentries' names to flush. Thus we need to pass the task's pid to proc_flush_task() as struct pid is the only object that can provide all the pid numbers. But after __exit_signal() task has detached all his pids and this information is lost. This creates a tiny gap for proc_pid_lookup() to bring some dentries back to tree and keep them in hash (since pids are still alive before __exit_signal()) till the next shrink, but since proc_flush_task() does not provide a 100% guarantee that the dentries will be flushed, this is OK to do so. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19pid namespaces: introduce MS_KERNMOUNT flagPavel Emelyanov
This flag tells the .get_sb callback that this is a kern_mount() call so that it can trust *data pointer to be valid in-kernel one. If this flag is passed from the user process, it is cleared since the *data pointer is not a valid kernel object. Running a few steps forward - this will be needed for proc to create the superblock and store a valid pid namespace on it during the namespace creation. The reason, why the namespace cannot live without proc mount is described in the appropriate patch. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19fs/super.c: use list_for_each_entry() instead of list_for_each()Matthias Kaehlcke
fs/super.c: use list_for_each_entry() instead of list_for_each() in sget() [akpm@linux-foundation.org: clean up some crap while we're there] Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19fs/eventpoll.c: use list_for_each_entry() instead of list_for_each()Matthias Kaehlcke
fs/eventpoll.c: use list_for_each_entry() instead of list_for_each() in ep_poll_safewake() Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19fs/file_table.c: use list_for_each_entry() instead of list_for_each()Matthias Kaehlcke
fs/file_table.c: use list_for_each_entry() instead of list_for_each() in fs_may_remount_ro() Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>