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2010-08-15mm: fix up some user-visible effects of the stack guard pageLinus Torvalds1-1/+7
This commit makes the stack guard page somewhat less visible to user space. It does this by: - not showing the guard page in /proc/<pid>/maps It looks like lvm-tools will actually read /proc/self/maps to figure out where all its mappings are, and effectively do a specialized "mlockall()" in user space. By not showing the guard page as part of the mapping (by just adding PAGE_SIZE to the start for grows-up pages), lvm-tools ends up not being aware of it. - by also teaching the _real_ mlock() functionality not to try to lock the guard page. That would just expand the mapping down to create a new guard page, so there really is no point in trying to lock it in place. It would perhaps be nice to show the guard page specially in /proc/<pid>/maps (or at least mark grow-down segments some way), but let's not open ourselves up to more breakage by user space from programs that depends on the exact deails of the 'maps' file. Special thanks to Henrique de Moraes Holschuh for diving into lvm-tools source code to see what was going on with the whole new warning. Reported-and-tested-by: François Valenduc <francois.valenduc@tvcablenet.be Reported-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-14fs/dcache: fix function param name in kernel-docRandy Dunlap1-1/+1
Fix parameter name in kernel-doc notation (causes a warning). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-13Merge branch 'for_linus' of ↵Linus Torvalds1-19/+27
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: clean up compiler warning in start_this_handle()
2010-08-13Merge branch 'bkl/ioctl' of ↵Linus Torvalds7-42/+14
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing * 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing: bkl: Remove locked .ioctl file operation v4l: Remove reference to bkl ioctl in compat ioctl handling logfs: kill BKL
2010-08-13Mark arguments to certain syscalls as being constDavid Howells3-24/+35
Mark arguments to certain system calls as being const where they should be but aren't. The list includes: (*) The filename arguments of various stat syscalls, execve(), various utimes syscalls and some mount syscalls. (*) The filename arguments of some syscall helpers relating to the above. (*) The buffer argument of various write syscalls. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-14bkl: Remove locked .ioctl file operationArnd Bergmann4-36/+9
The last user is gone, so we can safely remove this Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: John Kacur <jkacur@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2010-08-14logfs: kill BKLArnd Bergmann3-6/+5
logfs does not need the BKL, so use ->unlocked_ioctl instead of ->ioctl in file operations. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Joern Engel <joern@logfs.org> [ fixed trivial conflict ] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2010-08-13Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6Linus Torvalds1-1/+1
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: [S390] partitions: fix build error in ibm partition detection code [S390] appldata: fix dev_get_stats 64 bit conversion [S390] wire up prlimit64 and fanotify* syscalls [S390] zcrypt: fix Kconfig dependencies [S390] sys_personality: follow u_long to unsigned int conversion [S390] dasd: fix format string types
2010-08-13Merge branch 'fixes' of ↵Linus Torvalds6-93/+122
git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: O2net: Disallow o2net accept connection request from itself. ocfs2/dlm: remove potential deadlock -V3 ocfs2/dlm: avoid incorrect bit set in refmap on recovery master Fix the nested PR lock calling issue in ACL ocfs2: Count more refcount records in file system fragmentation. ocfs2 fix o2dlm dlm run purgelist (rev 3) ocfs2/dlm: fix a dead lock ocfs2: do not overwrite error codes in ocfs2_init_acl
2010-08-13Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds11-46/+317
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: [NFS] Set CONFIG_KEYS when CONFIG_NFS_USE_KERNEL_DNS is set AFS: Implement an autocell mount capability [ver #2] DNS: If the DNS server returns an error, allow that to be cached [ver #2] NFS: Use kernel DNS resolver [ver #2] cifs: update README to include details about 'fsc' option
2010-08-13[S390] partitions: fix build error in ibm partition detection codeHeiko Carstens1-1/+1
9c867fbe "partitions: fix sometimes unreadable partition strings" coverted one line within the ibm partition code incorrectly. Fix this to get rid of a build error. fs/partitions/ibm.c: In function 'ibm_partition': [...] fs/partitions/ibm.c:185: error: too many arguments to function 'strlcat' Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-08-12Revert "fsnotify: store struct file not struct path"Linus Torvalds6-50/+30
This reverts commit 3bcf3860a4ff9bbc522820b4b765e65e4deceb3e (and the accompanying commit c1e5c954020e "vfs/fsnotify: fsnotify_close can delay the final work in fput" that was a horribly ugly hack to make it work at all). The 'struct file' approach not only causes that disgusting hack, it somehow breaks pulseaudio, probably due to some other subtlety with f_count handling. Fix up various conflicts due to later fsnotify work. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12[NFS] Set CONFIG_KEYS when CONFIG_NFS_USE_KERNEL_DNS is setSteve French1-0/+1
Previous patch relied on DNS_RESOLVER setting CONFIG_KEYS but needs to be selected in NFS config when using the new DNS resolver Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> CC: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-12Merge branch 'params' of ↵Linus Torvalds1-6/+5
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus * 'params' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: (22 commits) param: don't deref arg in __same_type() checks param: update drivers/acpi/debug.c to new scheme param: use module_param in drivers/message/fusion/mptbase.c ide: use module_param_named rather than module_param_call param: update drivers/char/ipmi/ipmi_watchdog.c to new scheme param: lock if_sdio's lbs_helper_name and lbs_fw_name against sysfs changes. param: lock myri10ge_fw_name against sysfs changes. param: simple locking for sysfs-writable charp parameters param: remove unnecessary writable charp param: add kerneldoc to moduleparam.h param: locking for kernel parameters param: make param sections const. param: use free hook for charp (fix leak of charp parameters) param: add a free hook to kernel_param_ops. param: silence .init.text references from param ops Add param ops struct for hvc_iucv driver. nfs: update for module_param_named API change AppArmor: update for module_param_named API change param: use ops in struct kernel_param, rather than get and set fns directly param: move the EXPORT_SYMBOL to after the definitions. ...
2010-08-12Add a dummy printk function for the maintenance of unused printksDavid Howells3-29/+10
Add a dummy printk function for the maintenance of unused printks through gcc format checking, and also so that side-effect checking is maintained too. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12mm: fix writeback_in_progress()Jan Kara1-1/+3
Commit 83ba7b071f3 ("writeback: simplify the write back thread queue") broke writeback_in_progress() as in that commit we started to remove work items from the list at the moment we start working on them and not at the moment they are finished. Thus if the flusher thread was doing some work but there was no other work queued, writeback_in_progress() returned false. This could in particular cause unnecessary queueing of background writeback from balance_dirty_pages() or writeout work from writeback_sb_if_idle(). This patch fixes the problem by introducing a bit in the bdi state which indicates that the flusher thread is processing some work and uses this bit for writeback_in_progress() test. NOTE: Both callsites of writeback_in_progress() (namely, writeback_inodes_sb_if_idle() and balance_dirty_pages()) would actually need a different information than what writeback_in_progress() provides. They would need to know whether *the kind of writeback they are going to submit* is already queued. But this information isn't that simple to provide so let's fix writeback_in_progress() for the time being. Signed-off-by: Jan Kara <jack@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Cc: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Jens Axboe <jaxboe@fusionio.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12writeback: merge for_kupdate and !for_kupdate casesWu Fengguang1-33/+10
Unify the logic for kupdate and non-kupdate cases. There won't be starvation because the inodes requeued into b_more_io will later be spliced _after_ the remaining inodes in b_io, hence won't stand in the way of other inodes in the next run. It avoids unnecessary redirty_tail() calls, hence the update of i_dirtied_when. The timestamp update is undesirable because it could later delay the inode's periodic writeback, or may exclude the inode from the data integrity sync operation (which checks timestamp to avoid extra work and livelock). === How the redirty_tail() comes about: It was a long story.. This redirty_tail() was introduced with wbc.more_io. The initial patch for more_io actually does not have the redirty_tail(), and when it's merged, several 100% iowait bug reports arised: reiserfs: http://lkml.org/lkml/2007/10/23/93 jfs: commit 29a424f28390752a4ca2349633aaacc6be494db5 JFS: clear PAGECACHE_TAG_DIRTY for no-write pages ext2: http://www.spinics.net/linux/lists/linux-ext4/msg04762.html They are all old bugs hidden in various filesystems that become "visible" with the more_io patch. At the time, the ext2 bug is thought to be "trivial", so not fixed. Instead the following updated more_io patch with redirty_tail() is merged: http://www.spinics.net/linux/lists/linux-ext4/msg04507.html This will in general prevent 100% on ext2 and possibly other unknown FS bugs. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Martin Bligh <mbligh@google.com> Cc: Michael Rubin <mrubin@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12writeback: fix queue_io() orderingWu Fengguang1-1/+9
This was not a bug, since b_io is empty for kupdate writeback. The next patch will do requeue_io() for non-kupdate writeback, so let's fix it. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Martin Bligh <mbligh@google.com> Cc: Michael Rubin <mrubin@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12writeback: don't redirty tail an inode with dirty pagesWu Fengguang1-13/+9
Avoid delaying writeback for an expire inode with lots of dirty pages, but no active dirtier at the moment. Previously we only do that for the kupdate case. Any filesystem that does delayed allocation or unwritten extent conversion after IO completion will cause this - for example, XFS. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Dave Chinner <david@fromorbit.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-12writeback: avoid unnecessary calculation of bdi dirty thresholdsWu Fengguang1-1/+1
Split get_dirty_limits() into global_dirty_limits()+bdi_dirty_limit(), so that the latter can be avoided when under global dirty background threshold (which is the normal state for most systems). Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11AFS: Implement an autocell mount capability [ver #2]wanglei7-46/+250
Implement the ability for the root directory of a mounted AFS filesystem to accept lookups of arbitrary directory names, to interpet the names as the names of cells, to look the cell names up in the DNS for AFSDB records and to mount the root.cell volume of the nominated cell on the pseudo-directory created by lookup. This facility is requested by passing: -o autocell to the mountpoint for which this is desired, usually the /afs mount. To use this facility, a DNS upcall program is required for AFSDB records. This can be obtained from: http://people.redhat.com/~dhowells/afs/dns.afsdb.c It should be compiled with -lresolv and -lkeyutils and installed as, say: /usr/sbin/dns.afsdb Then the following line needs to be added to /sbin/request-key.conf: create dns_resolver afsdb:* * /usr/sbin/dns.afsdb %k This can be tested by mounting AFS, say: insmod dns_resolver.ko insmod af-rxrpc.ko insmod kafs.ko rootcell=grand.central.org mount -t afs "#grand.central.org:root.cell." /afs -o autocell and doing: ls /afs/grand.central.org/ which should show: archive/ cvs/ doc/ local/ project/ service/ software/ user/ www/ if it works. Signed-off-by: Wang Lei <wang840925@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-11DNS: If the DNS server returns an error, allow that to be cached [ver #2]Wang Lei1-0/+4
If the DNS server returns an error, allow that to be cached in the DNS resolver key in lieu of a value. Userspace passes the desired error number as an option in the payload: "#dnserror=<number>" Userspace must map h_errno from the name resolution routines to an appropriate Linux error before passing it up. Something like the following mapping is recommended: [HOST_NOT_FOUND] = ENODATA, [TRY_AGAIN] = EAGAIN, [NO_RECOVERY] = ECONNREFUSED, [NO_DATA] = ENODATA, in lieu of Linux errors specifically for representing name service errors. The filesystem must map these errors appropropriately before passing them to userspace. AFS is made to map ENODATA and EAGAIN to EDESTADDRREQ for the return to userspace; ECONNREFUSED is allowed to stand as is. The error can be seen in /proc/keys as a negative number after the description of the key. Compare, for example, the following key entries: 2f97238c I--Q-- 1 53s 3f010000 0 0 dns_resol afsdb:grand.centrall.org: -61 338bfbbe I--Q-- 1 59m 3f010000 0 0 dns_resol afsdb:grand.central.org: 37 If the error option is supplied in the payload, the main part of the payload is discarded. The key should have an expiry time set by userspace. Signed-off-by: Wang Lei <wang840925@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-11NFS: Use kernel DNS resolver [ver #2]Bryan Schumaker3-0/+52
Use the kernel DNS resolver to translate hostnames to IP addresses. Create a new config option to choose between the legacy DNS resolver and the new resolver. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-11cifs: update README to include details about 'fsc' optionSuresh Jayaraman1-0/+10
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-11Merge branch 'for-linus' of ↵Linus Torvalds9-115/+180
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: isofs: Fix lseek() to position beyond 4 GB vfs: remove unused MNT_STRICTATIME vfs: show unreachable paths in getcwd and proc vfs: only add " (deleted)" where necessary vfs: add prepend_path() helper vfs: __d_path: dont prepend the name of the root dentry ia64: perfmon: add d_dname method vfs: add helpers to get root and pwd cachefiles: use path_get instead of lone dget fs/sysv/super.c: add support for non-PDP11 v7 filesystems V7: Adjust sanity checks for some volumes Add v7 alias v9fs: fixup for inode_setattr being removed Manual merge to take Al's version of the fs/sysv/super.c file: it merged cleanly, but Al had removed an unnecessary header include, so his side was better.
2010-08-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linusLinus Torvalds8-20/+180
* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus: Squashfs: fix checkpatch.pl warnings Squashfs: fix filename typo Squashfs: update Kconfig and documentation for LZO Squashfs: fix block size use in LZO decompressor Squashfs: Add LZO compression support squashfs: fix filename in header comment Squashfs: Make XATTR config name consistent with other file systems squashfs: fix compiler inline warning
2010-08-11Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osdLinus Torvalds4-52/+31
* 'for-linus' of git://git.open-osd.org/linux-open-osd: exofs: Fix groups code when num_devices is not divisible by group_width exofs: Remove useless optimization exofs: exofs_file_fsync and exofs_file_flush correctness exofs: Remove superfluous dependency on buffer_head and writeback
2010-08-11Merge branch 'for-linus' of ↵Linus Torvalds39-410/+1162
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (39 commits) ceph: generalize mon requests, add pool op support ceph: only queue async writeback on cap revocation if there is dirty data ceph: do not ignore osd_idle_ttl mount option ceph: constify dentry_operations ceph: whitespace cleanup ceph: add flock/fcntl lock support ceph: define on-wire types, constants for file locking support ceph: add CEPH_FEATURE_FLOCK to the supported feature bits ceph: support v2 reconnect encoding ceph: support v2 client_caps encoding ceph: move AES iv definition to shared header ceph: fix decoding of pool snap info ceph: make ->sync_fs not wait if wait==0 ceph: warn on missing snap realm ceph: print useful error message when crush rule not found ceph: use %pU to print uuid (fsid) ceph: sync header defs with server code ceph: clean up header guards ceph: strip misleading/obsolete version, feature info ceph: specify supported features in super.h ...
2010-08-11fs/sysv/super.c: add support for non-PDP11 v7 filesystemsLubomir Rintel1-24/+51
This adds byte order autodetection (of PDP-11 and LE filesystems). No attempt is made to detect big-endian filesystems -- were there any? Tested with PDP-11 v7 filesystems and PC-IX maintenance floppy. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11fs/sysv: v7: adjust sanity checks for some volumesLubomir Rintel1-2/+4
Newly mkfs-ed filesystems from Seventh Edition have last modification time set to zero, but are otherwise perfectly valid. Also, tighten up other sanity checks to filter out most filesystems with [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11fs/sysv: add v7 aliasLubomir Rintel1-0/+1
So that the module gets autoloaded when a v7 filesystem is mounted. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11afs: destroy work queue on init failureDan Carpenter1-0/+1
We can clean up the work queue on this error path. This function is called from afs_init(). Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11partitions: fix sometimes unreadable partition stringsAlexey Dobriyan16-72/+136
Fix this garbage happening quite often: ==> sda: scsi 3:0:0:0: CD-ROM TOSHIBA ==> sda1 sda2 sda3 sda4 <sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray ^^^ Uniform CD-ROM driver Revision: 3.20 sr 3:0:0:0: Attached scsi CD-ROM sr0 ==> sda5 sda6 sda7 > Make "sda: sda1 ..." lines actually lines. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11procfs: simplify conditional processing of fs/proc.o.Robert P. J. Day1-1/+1
Since the entire fs/proc directory is conditionally included based on CONFIG_PROC_FS, it's redundant to check that same variable within that directory. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11signalfd: fill in ssi_int for posix timers and message queuesNathan Lynch1-0/+2
If signalfd is used to consume a signal generated by a POSIX interval timer or POSIX message queue, the ssi_int field does not reflect the data (sigevent->sigev_value) supplied to timer_create(2) or mq_notify(3). (The ssi_ptr field, however, is filled in.) This behavior differs from signalfd's treatment of sigqueue-generated signals -- see the default case in signalfd_copyinfo. It also gives results that differ from the case when a signal is handled conventionally via a sigaction-registered handler. So, set signalfd_siginfo->ssi_int in the remaining cases (__SI_TIMER, __SI_MESGQ) where ssi_ptr is set. akpm: a non-back-compatible change. Merge into -stable to minimise the number of kernels which are in the field and which miss this feature. Signed-off-by: Nathan Lynch <ntl@pobox.com> Acked-by: Davide Libenzi <davidel@xmailserver.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11blkdev: cgroup whitelist permission fixChris Wright1-4/+6
The cgroup device whitelist code gets confused when trying to grant permission to a disk partition that is not currently open. Part of blkdev_open() includes __blkdev_get() on the whole disk. Basically, the only ways to reliably allow a cgroup access to a partition on a block device when using the whitelist are to 1) also give it access to the whole block device or 2) make sure the partition is already open in a different context. The patch avoids the cgroup check for the whole disk case when opening a partition. Addresses https://bugzilla.redhat.com/show_bug.cgi?id=589662 Signed-off-by: Chris Wright <chrisw@sous-sol.org> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Tested-by: Serge E. Hallyn <serue@us.ibm.com> Reported-by: Vivek Goyal <vgoyal@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: "Daniel P. Berrange" <berrange@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11reiserfs: remove unused local `wait'Changli Gao1-1/+0
Signed-off-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11autofs4: remove unneeded null check in try_to_fill_dentry()Dan Carpenter1-2/+1
After 97e7449a7ad: "autofs4: fix indirect mount pending expire race" we no longer assumed that "ino" can be null. The other null checks got removed but this was one was missed. Signed-off-by: Dan Carpenter <error27@gmail.com> Cc: Ian Kent <raven@themaw.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11vfs: use kmalloc() to allocate fdmem if possibleChangli Gao1-34/+23
Use kmalloc() to allocate fdmem if possible. vmalloc() is used as a fallback solution for fdmem allocation. A new helper function __free_fdtable() is introduced to reduce the lines of code. A potential bug, vfree() a memory allocated by kmalloc(), is fixed. [akpm@linux-foundation.org: use __GFP_NOWARN, uninline alloc_fdmem() and free_fdmem()] Signed-off-by: Changli Gao <xiaosuo@gmail.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Jiri Slaby <jslaby@suse.cz> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Avi Kivity <avi@redhat.com> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11vfs: clarify that nonseekable_open() will never failDmitry Torokhov1-1/+3
Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: John Kacur <jkacur@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11vfs: O_* bit numbers uniqueness checkWu Fengguang1-2/+13
The O_* bit numbers are defined in 20+ arch/*, and can silently overlap. Add a compile time check to ensure the uniqueness as suggested by David Miller. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: David Miller <davem@davemloft.net> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Eric Paris <eparis@redhat.com> Cc: Roland Dreier <rdreier@cisco.com> Cc: Jamie Lokier <jamie@shareable.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11vfs: improve comment describing fget_light()Tony Battersby1-5/+14
Improve the description of fget_light(), which is currently incorrect about needing a prior refcnt (judging by the way it is actually used). Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11param: use ops in struct kernel_param, rather than get and set fns directlyRusty Russell1-6/+5
This is more kernel-ish, saves some space, and also allows us to expand the ops without breaking all the callers who are happy for the new members to be NULL. The few places which defined their own param types are changed to the new scheme (more which crept in recently fixed in following patches). Since we're touching them anyway, we change get() and set() to take a const struct kernel_param (which they really are). This causes some harmless warnings until we fix them (in following patches). To reduce churn, module_param_call creates the ops struct so the callers don't have to change (and casts the functions to reduce warnings). The modern version which takes an ops struct is called module_param_cb. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Ville Syrjala <syrjala@sci.fi> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Alessandro Rubini <rubini@ipvvis.unipv.it> Cc: Michal Januszewski <spock@gentoo.org> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Neil Brown <neilb@suse.de> Cc: linux-kernel@vger.kernel.org Cc: linux-input@vger.kernel.org Cc: linux-fbdev-devel@lists.sourceforge.net Cc: linux-nfs@vger.kernel.org Cc: netdev@vger.kernel.org
2010-08-11isofs: Fix lseek() to position beyond 4 GBJan Andres1-1/+6
isofs supports files larger than 4 GB by using multi-extent files. However an lseek() to a position beyond 4 GB in such a file will fail with EINVAL, because s_maxbytes in the isofs superblock is initialized to 2^32-1, and generic_file_llseek() checks against that value. I therefore suggest increasing the value of s_maxbytes to have full support for large files in isofs. With multi-extent files, file size is only limited by the maximum size of the file system (8 TB), so this seems a reasonable value for s_maxbytes. Signed-off-by: Jan Andres <jandres@gmx.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: remove unused MNT_STRICTATIMEMiklos Szeredi1-1/+0
Commit d0adde574b8487ef30f69e2d08bba769e4be513f added MNT_STRICTATIME but it isn't actually used (MS_STRICTATIME clears MNT_RELATIME and MNT_NOATIME rather than setting any mount flag). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: show unreachable paths in getcwd and procMiklos Szeredi2-5/+51
Prepend "(unreachable)" to path strings if the path is not reachable from the current root. Two places updated are - the return string from getcwd() - and symlinks under /proc/$PID. Other uses of d_path() are left unchanged (we know that some old software crashes if /proc/mounts is changed). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: only add " (deleted)" where necessaryMiklos Szeredi1-10/+22
__d_path() has 4 callers: d_path() sys_getcwd() seq_path_root() tomoyo_realpath_from_path2() Of these the only one which needs the " (deleted)" ending is d_path(). sys_getcwd() checks for existence before calling __d_path(). seq_path_root() is used to show the mountpoint path in /proc/PID/mountinfo, which is always a positive. And tomoyo doesn't want the deleted ending. Create a helper "path_with_deleted()" as subsequent patches will need this in multiple places. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: add prepend_path() helperMiklos Szeredi1-36/+58
Split off prepend_path() from __d_path(). This new helper takes an end-of-buffer pointer and buffer-length pointer just like the other prepend_* functions. Move the " (deleted)" postfix out to __d_path(). This patch doesn't change any functionality but paves the way for the following patches. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: __d_path: dont prepend the name of the root dentryMiklos Szeredi1-3/+9
In the old times pseudo-filesystems set the name of theroot dentry to some prefix like "pipe:" and the name of the child dentry to "[123]" and relied on a hack in __d_path() to replace the preceding slash with the root's name to get "pipe:[123]". Then the d_dname() dentry operation was introduced which solved the same problem without having to pre-fill the name in each dentry. Currently the following pseudo filesystems exist in the kernel: perfmon mtd anon_inode bdev pipe socket Of these only perfmon, anon_inode, pipe and socket create sub-dentries, all of which have now been switched to using d_dname(). bdev and mtd only create inodes. This means that now the hack to overwrite the slash can be removed, so for unreachable paths (e.g. within a detached mount) the path string won't be polluted with garbage. For these cases a subsequent patch will add a prefix, indicating that the path is unreachable. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11vfs: add helpers to get root and pwdMiklos Szeredi6-55/+20
Add three helpers that retrieve a refcounted copy of the root and cwd from the supplied fs_struct. get_fs_root() get_fs_pwd() get_fs_root_and_pwd() Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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