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2008-01-25[GFS2] Don't add glocks to the journalSteven Whitehouse
The only reason for adding glocks to the journal was to keep track of which locks required a log flush prior to release. We add a flag to the glock to allow this check to be made in a simpler way. This reduces the size of a glock (by 12 bytes on i386, 24 on x86_64) and means that we can avoid extra work during the journal flush. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] check kthread_should_stop when waitingDavid Teigland
Use wait_event_interruptible() in the lock_dlm thread instead of an open coded equivalent, and include a kthread_should_stop() check in the wait test so we don't miss a kthread_stop(). Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Given device ID rather than s_id in "id" sysfs fileBob Peterson
This patch changes the /sys/fs/gfs2/<s_id>/id file to give the device id "major:minor" rather than the s_id. That enables gfs2_tool to match devices properly (by id, not name) when locating the tuning files. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Remove flags no longer requiredSteven Whitehouse
The HIF_MUTEX and HIF_PROMOTE flags were set on the glock holders depending upon which of the two waiters lists they were going to be queued upon. They were then tested when the holders were taken off the lists to ensure that the right type of holder was being dequeued. Since we are already using separate lists, there doesn't seem a lot of point having these flags as well, and since setting them and testing them is in the fast path for locking and unlocking glock, this patch removes them. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Reorder writeback for glock syncSteven Whitehouse
Previously we were doing (write data, wait for data, write metadata, wait for metadata). After this patch we so (write metadata, write data, wait for data, wait for metadata) which should be more efficient. Also I noticed that the drop_bh and xmote_bh functions were almost identical. In fact the only difference was a single test, and that test is such that in the drop_bh case, it would always evaluate to the correct result. As such we can use the xmote_bh functions in all the places where we were using the drop_bh function and remove the drop_bh functions. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Add sync_page to metadata address space operationsSteven Whitehouse
This set of address space operations was missing a sync_page operation. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Remove "reclaim limit"Steven Whitehouse
This call to reclaim glocks is not needed, and in particular we don't want it in the fast path for locking glocks. The limit was entirely arbitrary anyway and we can't expect users to adjust things like this, the remaining code will do the right thing on its own. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Remove unused variablesSteven Whitehouse
These haven't been used for some time, remove them. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Use correct include file in ops_address.cSteven Whitehouse
Something changed in the upstream kernel, and it needs this one-liner to allow ops_address.c to build. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Don't hold page lock when starting transactionSteven Whitehouse
This is an addendum to the new AOPs work which moves the point at which we take the page lock so that we don't get it until the last possible moment. This resolves a conflict between starting transactions and the page lock. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Add writepages for GFS2 jdataSteven Whitehouse
This patch resolves a lock ordering issue where we had been getting a transaction lock in the wrong order with respect to the page lock. By using writepages rather than just writepage, it is then possible to start a transaction before locking the page, and thus matching the locking order elsewhere in the code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Split gfs2_writepage into three casesSteven Whitehouse
This patch splits gfs2_writepage into separate functions for each of the three cases: writeback, ordered and journalled. As a result it becomes a lot easier to see what each one is doing. The common code is moved into gfs2_writepage_common. This fixes a performance bug where we were doing more work than strictly required in the ordered write case. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Introduce gfs2_set_aops()Steven Whitehouse
Just like ext3 we now have three sets of address space operations to cover the cases of writeback, ordered and journalled data writes. This means that the individual operations can now become less complicated as we are able to remove some of the tests for file data mode from the code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Add gfs2_is_writeback()Steven Whitehouse
This adds a function "gfs2_is_writeback()" along the lines of the existing "gfs2_is_jdata()" in order to clean up the code and make the various tests for the inode mode more obvious. It also fixes the PageChecked() logic where we were resetting the flag too early in the case of an error path. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Remove unused field in struct gfs2_inodeSteven Whitehouse
Removes a field that is not used. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Remove useless i_cache from inodesSteven Whitehouse
The i_cache was designed to keep references to the indirect blocks used during block mapping so that they didn't have to be looked up continually. The idea failed because there are too many places where the i_cache needs to be freed, and this has in the past been the cause of many bugs. In addition there was no performance benefit being gained since the disk blocks in question were cached anyway. So this patch removes it in order to simplify the code to prepare for other changes which would otherwise have had to add further support for this feature. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Use ->page_mkwrite() for mmap()Steven Whitehouse
This cleans up the mmap() code path for GFS2 by implementing the page_mkwrite function for GFS2. We are thus able to use the generic filemap_fault function for our ->fault() implementation. This now means that shared writable mappings will be much more efficiently shared across the cluster if there is a reasonable proportion of read activity (the greater proportion, the better). As a side effect, it also reduces the size of the code, removes special cases from readpage and readpages, and makes the code path easier to follow. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-25[GFS2] Clean up internal read functionSteven Whitehouse
As requested by Christoph, this patch cleans up GFS2's internal read function so that it no longer uses the do_generic_mapping_read function. This function is obsolete and GFS2 is the last user of it. As a side effect the internal read code gets smaller and easier to read and gfs2_readpage is split into two. One function has the locking and the other function has the rest of the logic. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Christoph Hellwig <hch@infradead.org>
2008-01-25[GFS2] Handle multiple glock demote requestsWendy Cheng
Fix a race condition where multiple glock demote requests are sent to a node back-to-back. This patch does a check inside handle_callback() to see whether a demote request is in progress. If true, it sets a flag to make sure run_queue() will loop again to handle the new request, instead of erronously setting gl_demote_state to a different state. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2008-01-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC]: Constify function pointer tables. [SPARC64]: Fix section error in sparcspkr [SPARC64]: Fix of section mismatch warnings.
2008-01-22[SPARC]: Constify function pointer tables.Jan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-22Fix file references in documentation and KconfigJohann Felix Soden
Fix typo in arch/powerpc/boot/flatdevtree_env.h. There is no Documentation/networking/ixgbe.txt. README.cycladesZ is now in Documentation/. wavelan.p.h is now in drivers/net/wireless/. HFS.txt is now Documentation/filesystems/hfs.txt. OSS-files are now in sound/oss/. Signed-off-by: Johann Felix Soden <johfel@users.sourceforge.net> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-17jbd: do not try lock_acquire after handle made invalidJonas Bonn
This likely fixes the oops in __lock_acquire reported as: http://www.kerneloops.org/raw.php?rawid=2753&msgid= http://www.kerneloops.org/raw.php?rawid=2749&msgid= In these reported oopses, start_this_handle is returning -EROFS. Signed-off-by: Jonas Bonn <jonas.bonn@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-17hfs: fix coverity-found null derefEric Sandeen
Fix potential null deref introduced by commit cf0594625083111ae522496dc1c256f7476939c2 http://bugzilla.kernel.org/show_bug.cgi?id=9748 Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Reported-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-16sysfs: fix bugs in sysfs_rename/move_dir()Tejun Heo
sysfs_rename/move_dir() have the following bugs. - On dentry lookup failure, kfree() is called on ERR_PTR() value. - sysfs_move_dir() has an extra dput() on success path. Fix them. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-16sysfs: make sysfs_lookup() return ERR_PTR(-ENOENT) on failed lookupTejun Heo
sysfs tries to keep dcache a strict subset of sysfs_dirent tree by shooting down dentries when a node is removed, that is, no negative dentry for sysfs. However, the lookup function returned NULL and thus created negative dentries when the target node didn't exist. Make sysfs_lookup() return ERR_PTR(-ENOENT) on lookup failure. This fixes the NULL dereference bug in sysfs_get_dentry() discovered by bluetooth rfcomm device moving around. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-14Revert "writeback: introduce writeback_control.more_io to indicate more io"Linus Torvalds
This reverts commit 2e6883bdf49abd0e7f0d9b6297fc3be7ebb2250b, as requested by Fengguang Wu. It's not quite fully baked yet, and while there are patches around to fix the problems it caused, they should get more testing. Says Fengguang: "I'll resend them both for -mm later on, in a more complete patchset". See http://bugzilla.kernel.org/show_bug.cgi?id=9738 for some of this discussion. Requested-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-14fix the "remove task_ppid_nr_ns" commitOleg Nesterov
Commit 84427eaef1fb91704c7112bdb598c810003b99f3 (remove task_ppid_nr_ns) moved the task_tgid_nr_ns(task->real_parent) outside of lock_task_sighand(). This is wrong, ->real_parent could be freed/reused. Both ->parent/real_parent point to nothing after __exit_signal() because we remove the child from ->children list, and thus the child can't be reparented when its parent exits. rcu_read_lock() protects ->parent/real_parent, but _only_ if we know it was valid before we take rcu lock. Revert this part of the patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-13knfsd: Allow NFSv2/3 WRITE calls to succeed when krb5i etc is used.NeilBrown
When RPCSEC/GSS and krb5i is used, requests are padded, typically to a multiple of 8 bytes. This can make the request look slightly longer than it really is. As of f34b95689d2ce001c "The NFSv2/NFSv3 server does not handle zero length WRITE request correctly", the xdr decode routines for NFSv2 and NFSv3 reject requests that aren't the right length, so krb5i (for example) WRITE requests can get lost. This patch relaxes the appropriate test and enhances the related comment. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: Peter Staubach <staubach@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-13remove task_ppid_nr_nsRoland McGrath
task_ppid_nr_ns is called in three places. One of these should never have called it. In the other two, using it broke the existing semantics. This was presumably accidental. If the function had not been there, it would have been much more obvious to the eye that those patches were changing the behavior. We don't need this function. In task_state, the pid of the ptracer is not the ppid of the ptracer. In do_task_stat, ppid is the tgid of the real_parent, not its pid. I also moved the call outside of lock_task_sighand, since it doesn't need it. In sys_getppid, ppid is the tgid of the real_parent, not its pid. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-12Use access mode instead of open flags to determine needed permissionsLinus Torvalds
Way back when (in commit 834f2a4a1554dc5b2598038b3fe8703defcbe467, aka "VFS: Allow the filesystem to return a full file pointer on open intent" to be exact), Trond changed the open logic to keep track of the original flags to a file open, in order to pass down the the intent of a dentry lookup to the low-level filesystem. However, when doing that reorganization, it changed the meaning of namei_flags, and thus inadvertently changed the test of access mode for directories (and RO filesystem) to use the wrong flag. So fix those test back to use access mode ("acc_mode") rather than the open flag ("flag"). Issue noticed by Bill Roman at Datalight. Reported-and-tested-by: Bill Roman <bill.roman@datalight.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-11Merge 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] fix unaligned access in readdir
2008-01-11[XFS] fix unaligned access in readdirChristoph Hellwig
This patch should fix the issue seen on Alpha with unaligned accesses in the new readdir code. By aligning each dirent to sizeof(u64) we'll avoid unaligned accesses. To make doubly sure we're not hitting problems also rearrange struct hack_dirent to avoid holes. SGI-PV: 975411 SGI-Modid: xfs-linux-melb:xfs-kern:30302a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
2008-01-10NFSv4: Give the lock stateid its own sequence queueTrond Myklebust
Sharing the open sequence queue causes a deadlock when we try to take both a lock sequence id and and open sequence id. This fixes the regression reported by Dimitri Puzin and Jeff Garzik: See http://bugzilla.kernel.org/show_bug.cgi?id=9712 for details. Reported-and-tested-by: Dimitri Puzin <bugs@psycast.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-08hfs: handle more on-disk corruptions without oopsingEric Sandeen
hfs seems prone to bad things when it encounters on disk corruption. Many values are read from disk, and used as lengths to memcpy, as an example. This patch fixes up several of these problematic cases. o sanity check the on-disk maximum key lengths on mount (these are set to a defined value at mkfs time and shouldn't differ) o check on-disk node keylens against the maximum key length for each tree o fix hfs_btree_open so that going out via free_tree: doesn't wind up in hfs_releasepage, which wants to follow the very pointer we were trying to set up: HFS_SB(sb)->cat_tree = hfs_btree_open() ... failure gets to hfs_releasepage and tries to follow HFS_SB(sb)->cat_tree Tested with the fsfuzzer; it survives more than it used to. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-08eCryptfs: fix dentry handling on create error, unlink, and inode destroyMichael Halcrow
This patch corrects some erroneous dentry handling in eCryptfs. If there is a problem creating the lower file, then there is nothing that the persistent lower file can do to really help us. This patch makes a vfs_create() failure in the lower filesystem always lead to an unconditional do_create failure in eCryptfs. Under certain sequences of operations, the eCryptfs dentry can remain in the dcache after an unlink. This patch calls d_drop() on the eCryptfs dentry to correct this. eCryptfs has no business calling d_delete() directly on a lower filesystem's dentry. This patch removes the call to d_delete() on the lower persistent file's dentry in ecryptfs_destroy_inode(). (Thanks to David Kleikamp, Eric Sandeen, and Jeff Moyer for helping identify and resolve this issue) Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-08fat: optimize fat_count_free_clusters()OGAWA Hirofumi
On large partition, scanning the free clusters is very slow if users doesn't use "usefree" option. For optimizing it, this patch uses sb_breadahead() to read of FAT sectors. On some user's 15GB partition, this patch improved it very much (1min => 600ms). The following is the result of 2GB partition on my machine. without patch: root@devron (/)# time df -h > /dev/null real 0m1.202s user 0m0.000s sys 0m0.440s with patch: root@devron (/)# time df -h > /dev/null real 0m0.378s user 0m0.012s sys 0m0.168s Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-07core dump: real_parent ppidRoland McGrath
The pr_ppid field reported in core dumps should match what getppid() would have returned to that process, regardless of whether a debugger is attached. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-06fix: using joysticks in 32 bit applications on 64 bit systemsAkos Maroy
unfortunately 32 bit apps don't see the joysticks on a 64 bit system. this prevents one playing X-Plane (http://www.x-plane.com/) or other 32-bit games with joysticks. this is a known issue, and already raised several times: http://readlist.com/lists/vger.kernel.org/linux-kernel/28/144411.html http://www.brettcsmith.org/wiki/wiki.cgi?action=browse&diff=1&id=OzyComputer/Joystick unfortunately this is still not fixed in the mainline kernel. it would be nice to have this fixed, so that people can play these games without having to patch their kernel. the following patch solves the problem on 2.6.22. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-03NFSv4: Fix open_to_lock_owner sequenceid allocation...Trond Myklebust
NFSv4 file locking is currently completely broken since it doesn't respect the OPEN sequencing when it is given an unconfirmed lock_owner and needs to do an open_to_lock_owner. Worse: it breaks the sunrpc rules by doing a GFP_KERNEL allocation inside an rpciod callback. Fix is to preallocate the open seqid structure in nfs4_alloc_lockdata if we see that the lock_owner is unconfirmed. Then, in nfs4_lock_prepare() we wait for either the open_seqid, if the lock_owner is still unconfirmed, or else fall back to waiting on the standard lock_seqid. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-01-03NFSv4: nfs4_open_confirm must not set the open_owner as confirmed on errorTrond Myklebust
RFC3530 states that the open_owner is confirmed if and only if the client sends an OPEN_CONFIRM request with the appropriate sequence id and stateid within the lease period. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-01-03NFSv4: Fix circular locking dependency in nfs4_kill_renewdTrond Myklebust
Erez Zadok reports: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.24-rc6-unionfs2 #80 ------------------------------------------------------- umount.nfs4/4017 is trying to acquire lock: (&(&clp->cl_renewd)->work){--..}, at: [<c0223e53>] __cancel_work_timer+0x83/0x17f but task is already holding lock: (&clp->cl_sem){----}, at: [<f8879897>] nfs4_kill_renewd+0x17/0x29 [nfs] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&clp->cl_sem){----}: [<c0230699>] __lock_acquire+0x9cc/0xb95 [<c0230c39>] lock_acquire+0x5f/0x78 [<c0397cb8>] down_read+0x3a/0x4c [<f88798e6>] nfs4_renew_state+0x1c/0x1b8 [nfs] [<c0223821>] run_workqueue+0xd9/0x1ac [<c0224220>] worker_thread+0x7a/0x86 [<c0226b49>] kthread+0x3b/0x62 [<c02033a3>] kernel_thread_helper+0x7/0x10 [<ffffffff>] 0xffffffff -> #0 (&(&clp->cl_renewd)->work){--..}: [<c0230589>] __lock_acquire+0x8bc/0xb95 [<c0230c39>] lock_acquire+0x5f/0x78 [<c0223e87>] __cancel_work_timer+0xb7/0x17f [<c0223f5a>] cancel_delayed_work_sync+0xb/0xd [<f887989e>] nfs4_kill_renewd+0x1e/0x29 [nfs] [<f885a8f6>] nfs_free_client+0x37/0x9e [nfs] [<f885ab20>] nfs_put_client+0x5d/0x62 [nfs] [<f885ab9a>] nfs_free_server+0x75/0xae [nfs] [<f8862672>] nfs4_kill_super+0x27/0x2b [nfs] [<c0258aab>] deactivate_super+0x3f/0x51 [<c0269668>] mntput_no_expire+0x42/0x67 [<c025d0e4>] path_release_on_umount+0x15/0x18 [<c0269d30>] sys_umount+0x1a3/0x1cb [<c0269d71>] sys_oldumount+0x19/0x1b [<c02026ca>] sysenter_past_esp+0x5f/0xa5 [<ffffffff>] 0xffffffff Looking at the code, it would seem that taking the clp->cl_sem in nfs4_kill_renewd is completely redundant, since we're already guaranteed to have exclusive access to the nfs_client (we're shutting down). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-01-03NFS: Fix a possible Oops in fs/nfs/super.cTrond Myklebust
Sigh... commit 4584f520e1f773082ef44ff4f8969a5d992b16ec (NFS: Fix NFS mountpoint crossing...) had a slight flaw: server can be NULL if sget() returned an existing superblock. Fix the fix by dereferencing s->s_fs_info. Thanks to Coverity/Adrian Bunk and Frank Filz for spotting the bug. (See http://bugzilla.kernel.org/show_bug.cgi?id=9647) Also add in the same namespace Oops fix for NFSv4 in both the mountpoint crossing case, and the referral case. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-01-02restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pidAl Viro
Contents of /proc/*/maps is sensitive and may become sensitive after open() (e.g. if target originally shares our ->mm and later does exec on suid-root binary). Check at read() (actually, ->start() of iterator) time that mm_struct we'd grabbed and locked is - still the ->mm of target - equal to reader's ->mm or the target is ptracable by reader. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-02Unify /proc/slabinfo configurationLinus Torvalds
Both SLUB and SLAB really did almost exactly the same thing for /proc/slabinfo setup, using duplicate code and per-allocator #ifdef's. This just creates a common CONFIG_SLABINFO that is enabled by both SLUB and SLAB, and shares all the setup code. Maybe SLOB will want this some day too. Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-01-02slub: register slabinfo to procfsPekka Enberg
We need to register slabinfo to procfs when CONFIG_SLUB is enabled to make the file actually visible to user-space. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-23ecryptfs: redo dget,mntget on dentry_open failureEric Sandeen
Thanks to Jeff Moyer for pointing this out. If the RDWR dentry_open() in ecryptfs_init_persistent_file fails, it will do a dput/mntput. Need to re-take references if we retry as RDONLY. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: Mike Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-23ecryptfs: fix unlocking in error pathsEric Sandeen
Thanks to Josef Bacik for finding these. A couple of ecryptfs error paths don't properly unlock things they locked. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Josef Bacik <jbacik@redhat.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-23Don't send quota messages repeatedly when hardlimit reachedJan Kara
We should send quota message to netlink only once when hardlimit is reached. Otherwise user could easily make the system busy by trying to exceed the hardlimit (and also the messages could be anoying if you cannot stop writing just now). Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-23Fix computation of SKB size for quota messagesJan Kara
Fix computation of size of skb needed for quota message. We should use netlink provided functions and not just an ad-hoc number. Also don't print the return value from nla_put_foo() as it is always -1. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>