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2010-07-21Bluetooth: Add HCIUARTSETFLAGS and HCIUARTGETFLAGS ioctlsJohan Hedberg
This patch introduces two new ioctls: HCIUARTSETFLAGS and HCIUARTGETFLAGS. The only flag available for now is HCI_UART_RAW_DEVICE which allows to initialize a UART device into RAW mode from userspace. This is particularly useful for experimenting with Bluetooth controllers that don't yet have proper support in BlueZ. Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2010-07-21Bluetooth: Add missing HCIUARTGETDEVICE ioctl to compat_ioctl.cJohan Hedberg
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2010-07-21Bluetooth: Add blacklist support for incoming connectionsJohan Hedberg
In some circumstances it could be desirable to reject incoming connections on the baseband level. This patch adds this feature through two new ioctl's: HCIBLOCKADDR and HCIUNBLOCKADDR. Both take a simple Bluetooth address as a parameter. BDADDR_ANY can be used with HCIUNBLOCKADDR to remove all devices from the blacklist. Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2010-05-30Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: mm: export generic_pipe_buf_*() to modules fuse: support splice() reading from fuse device fuse: allow splice to move pages mm: export remove_from_page_cache() to modules mm: export lru_cache_add_*() to modules fuse: support splice() writing to fuse device fuse: get page reference for readpages fuse: use get_user_pages_fast() fuse: remove unneeded variable
2010-05-30Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: quota: Convert quota statistics to generic percpu_counter ext3 uses rb_node = NULL; to zero rb_root. quota: Fixup dquot_transfer reiserfs: Fix resuming of quotas on remount read-write pohmelfs: Remove dead quota code ufs: Remove dead quota code udf: Remove dead quota code quota: rename default quotactl methods to dquot_ quota: explicitly set ->dq_op and ->s_qcop quota: drop remount argument to ->quota_on and ->quota_off quota: move unmount handling into the filesystem quota: kill the vfs_dq_off and vfs_dq_quota_on_remount wrappers quota: move remount handling into the filesystem ocfs2: Fix use after free on remount read-only Fix up conflicts in fs/ext4/super.c and fs/ufs/file.c
2010-05-30Merge branch 'for-linus' of ↵Linus Torvalds
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: ceph: clean up on forwarded aborted mds request ceph: fix leak of osd authorizer ceph: close out mds, osd connections before stopping auth ceph: make lease code DN specific fs/ceph: Use ERR_CAST ceph: renew auth tickets before they expire ceph: do not resend mon requests on auth ticket renewal ceph: removed duplicated #includes ceph: avoid possible null dereference ceph: make mds requests killable, not interruptible sched: add wait_for_completion_killable_timeout
2010-05-29ceph: clean up on forwarded aborted mds requestSage Weil
If an mds request is aborted (timeout, SIGKILL), it is left registered to keep our state in sync with the mds. If we get a forward notification, though, we know the request didn't succeed and we can unregister it safely. We were trying to resend it, but then bailing out (and not unregistering) in __do_request. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: fix leak of osd authorizerSage Weil
Release the ceph_authorizer when releasing osd state. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: close out mds, osd connections before stopping authSage Weil
The auth module (part of the mon_client) is needed to free any ceph_authorizer(s) used by the mds and osd connections. Flush the msgr workqueue before stopping monc to ensure that the destroy_authorizer auth op is available when those connections are closed out. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: make lease code DN specificSage Weil
The lease code includes a mask in the CEPH_LOCK_* namespace, but that namespace is changing, and only one mask (formerly _DN == 1) is used, so hard code for that value for now. If we ever extend this code to handle leases over different data types we can extend it accordingly. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29fs/ceph: Use ERR_CASTJulia Lawall
Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)). The former makes more clear what is the purpose of the operation, which otherwise looks like a no-op. In the case of fs/ceph/inode.c, ERR_CAST is not needed, because the type of the returned value is the same as the type of the enclosing function. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ type T; T x; identifier f; @@ T f (...) { <+... - ERR_PTR(PTR_ERR(x)) + x ...+> } @@ expression x; @@ - ERR_PTR(PTR_ERR(x)) + ERR_CAST(x) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: renew auth tickets before they expireSage Weil
We were only requesting renewal after our tickets expire; do so before that. Most of the low-level logic for this was already there; just use it. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: do not resend mon requests on auth ticket renewalSage Weil
We only want to send pending mon requests when we successfully authenticate. If we are already authenticated, like when we renew our ticket, there is no need to resend pending requests. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: removed duplicated #includesAndrea Gelmini
fs/ceph/auth.c: linux/slab.h is included more than once. fs/ceph/super.h: linux/slab.h is included more than once. Acked-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net> Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: avoid possible null dereferenceSage Weil
ac->ops may be null; use protocol id in error message instead. Reported-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-29ceph: make mds requests killable, not interruptibleSage Weil
The underlying problem is that many mds requests can't be restarted. For example, a restarted create() would return -EEXIST if the original request succeeds. However, we do not want a hung MDS to hang the client too. So, use the _killable wait_for_completion variants to abort on SIGKILL but nothing else. Signed-off-by: Sage Weil <sage@newdream.net>
2010-05-28Merge branch 'release' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (27 commits) ACPI: Don't let acpi_pad needlessly mark TSC unstable drivers/acpi/sleep.h: Checkpatch cleanup ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion ACPI: delete unused c-state promotion/demotion data strucutures ACPI: video: fix acpi_backlight=video ACPI: EC: Use kmemdup drivers/acpi: use kasprintf ACPI, APEI, EINJ injection parameters support Add x64 support to debugfs ACPI, APEI, Use ERST for persistent storage of MCE ACPI, APEI, Error Record Serialization Table (ERST) support ACPI, APEI, Generic Hardware Error Source memory error support ACPI, APEI, UEFI Common Platform Error Record (CPER) header Unified UUID/GUID definition ACPI Hardware Error Device (PNP0C33) support ACPI, APEI, PCIE AER, use general HEST table parsing in AER firmware_first setup ACPI, APEI, Document for APEI ACPI, APEI, EINJ support ACPI, APEI, HEST table parsing ACPI, APEI, APEI supporting infrastructure ...
2010-05-28remove detritus left by "mm: make read_cache_page synchronous"Al Viro
gets minix get_dir_page() in sync with its analogs; back in 2007 Nick has switched read_cache_page() and friends to sync behaviour (i.e. they wait for the page to get unlocked, check if it's uptodate and if it isn't return ERR_PTR(-EIO) instead) and removed the duplicate logics from the callers. In case of fs/minix/dir.c he'd removed only half of that... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fix fs/sysv s_dirt handlingAl Viro
got broken on ->sync_fs() conversion a year ago, nobody noticed... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fat: convert to use the new truncate convention.npiggin@suse.de
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27ext2: convert to use the new truncate convention.npiggin@suse.de
I also have commented a possible bug in existing ext2 code, marked with XXX. Cc: linux-ext4@vger.kernel.org Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fs: convert simple fs to new truncateNick Piggin
Convert simple filesystems: ramfs, configfs, sysfs, block_dev to new truncate sequence. Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27kill spurious reference to vmtruncatenpiggin@suse.de
Lots of filesystems calls vmtruncate despite not implementing the old ->truncate method. Switch them to use simple_setsize and add some comments about the truncate code where it seems fitting. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fs: introduce new truncate sequencenpiggin@suse.de
Introduce a new truncate calling sequence into fs/mm subsystems. Rather than setattr > vmtruncate > truncate, have filesystems call their truncate sequence from ->setattr if filesystem specific operations are required. vmtruncate is deprecated, and truncate_pagecache and inode_newsize_ok helpers introduced previously should be used. simple_setattr is introduced for simple in-ram filesystems to implement the new truncate sequence. Eventually all filesystems should be converted to implement a setattr, and the default code in notify_change should go away. simple_setsize is also introduced to perform just the ATTR_SIZE portion of simple_setattr (ie. changing i_size and trimming pagecache). To implement the new truncate sequence: - filesystem specific manipulations (eg freeing blocks) must be done in the setattr method rather than ->truncate. - vmtruncate can not be used by core code to trim blocks past i_size in the event of write failure after allocation, so this must be performed in the fs code. - convert usage of helpers block_write_begin, nobh_write_begin, cont_write_begin, and *blockdev_direct_IO* to use _newtrunc postfixed variants. These avoid calling vmtruncate to trim blocks (see previous). - inode_setattr should not be used. generic_setattr is a new function to be used to copy simple attributes into the generic inode. - make use of the better opportunity to handle errors with the new sequence. Big problem with the previous calling sequence: the filesystem is not called until i_size has already changed. This means it is not allowed to fail the call, and also it does not know what the previous i_size was. Also, generic code calling vmtruncate to truncate allocated blocks in case of error had no good way to return a meaningful error (or, for example, atomically handle block deallocation). Cc: Christoph Hellwig <hch@lst.de> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fs/super: fix kernel-doc warningRandy Dunlap
Fix fs/super.c kernel-doc warning and function notation: Warning(fs/super.c:957): No description found for parameter 'sb' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fs/minix: bugfix, number of indirect block ptrs per block depends on block sizeErik van der Kouwe
The MINIX filesystem driver used a constant number of indirect block pointers in an indirect block. This worked only for filesystems with 1kb block, while the MINIX default block size is now 4kb. As a consequence, large files were read incorrectly on such filesystems and writing a large file would cause the filesystem to become corrupted. This patch computes the number of indirect block pointers based on the block size, making the driver work for each block size. I would like to thank Feiran Zheng ('Fam') for pointing out the cause of the corruption. Signed-off-by: Erik van der Kouwe <vdkouwe@cs.vu.nl> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27rename the generic fsync implementationsChristoph Hellwig
We don't name our generic fsync implementations very well currently. The no-op implementation for in-memory filesystems currently is called simple_sync_file which doesn't make too much sense to start with, the the generic one for simple filesystems is called simple_fsync which can lead to some confusion. This patch renames the generic file fsync method to generic_file_fsync to match the other generic_file_* routines it is supposed to be used with, and the no-op implementation to noop_fsync to make it obvious what to expect. In addition add some documentation for both methods. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27drop unused dentry argument to ->fsyncChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27fs: Add missing mutex_unlockJulia Lawall
Add a mutex_unlock missing on the error path. At other exists from the function that return an error flag, the mutex is unlocked, so do the same here. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E1; @@ * mutex_lock(E1,...); <+... when != E1 if (...) { ... when != E1 * return ...; } ...+> * mutex_unlock(E1,...); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27get rid of the magic around f_count in aioAl Viro
__aio_put_req() plays sick games with file refcount. What it wants is fput() from atomic context; it's almost always done with f_count > 1, so they only have to deal with delayed work in rare cases when their reference happens to be the last one. Current code decrements f_count and if it hasn't hit 0, everything is fine. Otherwise it keeps a pointer to struct file (with zero f_count!) around and has delayed work do __fput() on it. Better way to do it: use atomic_long_add_unless( , -1, 1) instead of !atomic_long_dec_and_test(). IOW, decrement it only if it's not the last reference, leave refcount alone if it was. And use normal fput() in delayed work. I've made that atomic_long_add_unless call a new helper - fput_atomic(). Drops a reference to file if it's safe to do in atomic (i.e. if that's not the last one), tells if it had been able to do that. aio.c converted to it, __fput() use is gone. req->ki_file *always* contributes to refcount now. And __fput() became static. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27VFS: fix recent breakage of FS_REVAL_DOTNeil Brown
Commit 1f36f774b22a0ceb7dd33eca626746c81a97b6a5 broke FS_REVAL_DOT semantics. In particular, before this patch, the command ls -l in an NFS mounted directory would always check if the directory on the server had changed and if so would flush and refill the pagecache for the dir. After this patch, the same "ls -l" will repeatedly return stale date until the cached attributes for the directory time out. The following patch fixes this by ensuring the d_revalidate is called by do_last when "." is being looked-up. link_path_walk has already called d_revalidate, but in that case LOOKUP_OPEN is not set so nfs_lookup_verify_inode chooses not to do any validation. The following patch restores the original behaviour. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-27Revert "anon_inode: set S_IFREG on the anon_inode"Al Viro
This reverts commit a7cf4145bb86aaf85d4d4d29a69b50b688e2e49d.
2010-05-27Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstableLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (27 commits) Btrfs: add more error checking to btrfs_dirty_inode Btrfs: allow unaligned DIO Btrfs: drop verbose enospc printk Btrfs: Fix block generation verification race Btrfs: fix preallocation and nodatacow checks in O_DIRECT Btrfs: avoid ENOSPC errors in btrfs_dirty_inode Btrfs: move O_DIRECT space reservation to btrfs_direct_IO Btrfs: rework O_DIRECT enospc handling Btrfs: use async helpers for DIO write checksumming Btrfs: don't walk around with task->state != TASK_RUNNING Btrfs: do aio_write instead of write Btrfs: add basic DIO read/write support direct-io: do not merge logically non-contiguous requests direct-io: add a hook for the fs to provide its own submit_bio function fs: allow short direct-io reads to be completed via buffered IO Btrfs: Metadata ENOSPC handling for balance Btrfs: Pre-allocate space for data relocation Btrfs: Metadata ENOSPC handling for tree log Btrfs: Metadata reservation for orphan inodes Btrfs: Introduce global metadata reservation ...
2010-05-27Merge branch 'for_linus' of ↵Linus Torvalds
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: (40 commits) ext4: Make fsync sync new parent directories in no-journal mode ext4: Drop whitespace at end of lines ext4: Fix compat EXT4_IOC_ADD_GROUP ext4: Conditionally define compat ioctl numbers tracing: Convert more ext4 events to DEFINE_EVENT ext4: Add new tracepoints to track mballoc's buddy bitmap loads ext4: Add a missing trace hook ext4: restart ext4_ext_remove_space() after transaction restart ext4: Clear the EXT4_EOFBLOCKS_FL flag only when warranted ext4: Avoid crashing on NULL ptr dereference on a filesystem error ext4: Use bitops to read/modify i_flags in struct ext4_inode_info ext4: Convert calls of ext4_error() to EXT4_ERROR_INODE() ext4: Convert callers of ext4_get_blocks() to use ext4_map_blocks() ext4: Add new abstraction ext4_map_blocks() underneath ext4_get_blocks() ext4: Use our own write_cache_pages() ext4: Show journal_checksum option ext4: Fix for ext4_mb_collect_stats() ext4: check for a good block group before loading buddy pages ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate ext4: Remove extraneous newlines in ext4_msg() calls ... Fixed up trivial conflict in fs/ext4/fsync.c
2010-05-27Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6Linus Torvalds
* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: NFS: Fix another nfs_wb_page() deadlock NFS: Ensure that we mark the inode as dirty if we exit early from commit NFS: Fix a lock imbalance typo in nfs_access_cache_shrinker sunrpc: fix leak on error on socket xprt setup
2010-05-27quota: Convert quota statistics to generic percpu_counterDmitry Monakhov
Generic per-cpu counter has some memory overhead but it is negligible for modern systems and embedded systems compile without quota support. And code reuse is a good thing. This patch should fix complain from preemptive kernels which was introduced by dde9588853b1bde. [Jan Kara: Fixed patch to work on 32-bit archs as well] Reported-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jan Kara <jack@suse.cz>
2010-05-27fs/: do not fallback to default_llseek() when readdir() uses BKLjan Blunck
Do not use the fallback default_llseek() if the readdir operation of the filesystem still uses the big kernel lock. Since llseek() modifies file->f_pos of the directory directly it may need locking to not confuse readdir which usually uses file->f_pos directly as well Since the special characteristics of the BKL (unlocked on schedule) are not necessary in this case, the inode mutex can be used for locking as provided by generic_file_llseek(). This is only possible since all filesystems, except reiserfs, either use a directory as a flat file or with disk address offsets. Reiserfs on the other hand uses a 32bit hash off the filename as the offset so generic_file_llseek() can get used as well since the hash is always smaller than sb->s_maxbytes (= (512 << 32) - blocksize). Signed-off-by: Jan Blunck <jblunck@suse.de> Acked-by: Jan Kara <jack@suse.cz> Acked-by: Anders Larsen <al@alarsen.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27vfs: introduce noop_llseek()jan Blunck
This is an implementation of ->llseek useable for the rare special case when userspace expects the seek to succeed but the (device) file is actually not able to perform the seek. In this case you use noop_llseek() instead of falling back to the default implementation of ->llseek. Signed-off-by: Jan Blunck <jblunck@suse.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> 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>
2010-05-27aio: fix the compat vectored operationsJeff Moyer
The aio compat code was not converting the struct iovecs from 32bit to 64bit pointers, causing either EINVAL to be returned from io_getevents, or EFAULT as the result of the I/O. This patch passes a compat flag to io_submit to signal that pointer conversion is necessary for a given iocb array. A variant of this was tested by Michael Tokarev. I have also updated the libaio test harness to exercise this code path with good success. Further, I grabbed a copy of ltp and ran the testcases/kernel/syscall/readv and writev tests there (compiled with -m32 on my 64bit system). All seems happy, but extra eyes on this would be welcome. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix CONFIG_COMPAT=n build] Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Reported-by: Michael Tokarev <mjt@tls.msk.ru> Cc: Zach Brown <zach.brown@oracle.com> Cc: <stable@kernel.org> [2.6.35.1] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27compat: factor out compat_rw_copy_check_uvector from compat_do_readv_writevJeff Moyer
It was reported in http://lkml.org/lkml/2010/3/8/309 that 32 bit readv and writev AIO operations were not functioning properly. It turns out that the code to convert the 32bit io vectors to 64 bits was never written. The results of that can be pretty bad, but in my testing, it mostly ended up in generating EFAULT as we walked off the list of I/O vectors provided. This patch set fixes the problem in my environment. are greatly appreciated. This patch: Factor out code that will be used by both compat_do_readv_writev and the compat aio submission code paths. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Reported-by: Michael Tokarev <mjt@tls.msk.ru> Cc: Zach Brown <zach.brown@oracle.com> Cc: <stable@kernel.org> [2.6.35.1] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27fs/affs: use ERR_CASTJulia Lawall
Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)). The former makes more clear what is the purpose of the operation, which otherwise looks like a no-op. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ type T; T x; identifier f; @@ T f (...) { <+... - ERR_PTR(PTR_ERR(x)) + x ...+> } @@ expression x; @@ - ERR_PTR(PTR_ERR(x)) + ERR_CAST(x) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27kcore: add _text to KCORE_TEXTWu Fengguang
Extend KCORE_TEXT to cover the pages between _text and _stext, to allow examining some important page table pages. `readelf -a` output on x86_64 before and after patch: Type Offset VirtAddr PhysAddr before LOAD 0x00007fff8100c000 0xffffffff81009000 0x0000000000000000 after LOAD 0x00007fff81003000 0xffffffff81000000 0x0000000000000000 The newly covered pages are: 0xffffffff81000000 <startup_64> etc. 0xffffffff81001000 <init_level4_pgt> 0xffffffff81002000 <level3_ident_pgt> 0xffffffff81003000 <level3_kernel_pgt> 0xffffffff81004000 <level2_fixmap_pgt> 0xffffffff81005000 <level1_fixmap_pgt> 0xffffffff81006000 <level2_ident_pgt> 0xffffffff81007000 <level2_kernel_pgt> 0xffffffff81008000 <level2_spare_pgt> Before patch, /proc/kcore shows outdated contents for the above page table pages, for example: (gdb) p level3_ident_pgt $1 = {<text variable, no debug info>} 0xffffffff81002000 <level3_ident_pgt> (gdb) p/x *((pud_t *)&level3_ident_pgt)@512 $2 = {{pud = 0x1006063}, {pud = 0x0} <repeats 511 times>} while the real content is: root@hp /home/wfg# hexdump -s 0x1002000 -n 4096 /dev/mem 1002000 6063 0100 0000 0000 8067 0000 0000 0000 1002010 0000 0000 0000 0000 0000 0000 0000 0000 * 1003000 That is, on a x86_64 box with 2GB memory, we can see first-1GB / full-2GB identity mapping before/after patch: (gdb) p/x *((pud_t *)&level3_ident_pgt)@512 before $1 = {{pud = 0x1006063}, {pud = 0x0} <repeats 511 times>} after $1 = {{pud = 0x1006063}, {pud = 0x8067}, {pud = 0x0} <repeats 510 times>} Obviously the content before patch is wrong. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27proc: remove obsolete commentsAmerigo Wang
A quick test shows these comments are obsolete, so just remove them. Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27proc: cleanup: remove unused assignmentsDan Carpenter
I removed 3 unused assignments. The first two get reset on the first statement of their functions. For "err" in root.c we don't return an error and we don't use the variable again. Signed-off-by: Dan Carpenter <error27@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27proc: get_nr_threads() doesn't need ->siglock any longerOleg Nesterov
Now that task->signal can't go away get_nr_threads() doesn't need ->siglock to read signal->count. Also, make it inline, move into sched.h, and convert 2 other proc users of signal->count to use this (now trivial) helper. Henceforth get_nr_threads() is the only valid user of signal->count, we are ready to turn it into "int nr_threads" or, perhaps, kill it. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27exit: avoid sig->count in de_thread/__exit_signal synchronizationOleg Nesterov
de_thread() and __exit_signal() use signal_struct->count/notify_count for synchronization. We can simplify the code and use ->notify_count only. Instead of comparing these two counters, we can change de_thread() to set ->notify_count = nr_of_sub_threads, then change __exit_signal() to dec-and-test this counter and notify group_exit_task. Note that __exit_signal() checks "notify_count > 0" just for symmetry with exit_notify(), we could just check it is != 0. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> Cc: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27coredump: shift down_write(mmap_sem) into coredump_wait()Oleg Nesterov
- move the cprm.mm_flags checks up, before we take mmap_sem - move down_write(mmap_sem) and ->core_state check from do_coredump() to coredump_wait() This simplifies the code and makes the locking symmetrical. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Roland McGrath <roland@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27coredump: factor out put_cred() callsOleg Nesterov
Given that do_coredump() calls put_cred() on exit path, it is a bit ugly to do put_cred() + "goto fail" twice, just add the new "fail_creds" label. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Roland McGrath <roland@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27coredump: cleanup "ispipe" codeOleg Nesterov
- kill "int dump_count", argv_split(argcp) accepts argcp == NULL. - move "int dump_count" under " if (ispipe)" branch, fail_dropcount can check ispipe. - move "char **helper_argv" as well, change the code to do argv_free() right after call_usermodehelper_fns(). - If call_usermodehelper_fns() fails goto close_fail label instead of closing the file by hand. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Roland McGrath <roland@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-27coredump: factor out the not-ispipe file checksOleg Nesterov
do_coredump() does a lot of file checks after it opens the file or calls usermode helper. But all of these checks are only needed in !ispipe case. Move this code into the "else" branch and kill the ugly repetitive ispipe checks. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Roland McGrath <roland@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>