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* Merge branch 'for-linus' of ↵Linus Torvalds2012-06-01
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull third pile of signal handling patches from Al Viro: "This time it's mostly helpers and conversions to them; there's a lot of stuff remaining in the tree, but that'll either go in -rc2 (isolated bug fixes, ideally via arch maintainers' trees) or will sit there until the next cycle." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: x86: get rid of calling do_notify_resume() when returning to kernel mode blackfin: check __get_user() return value whack-a-mole with TIF_FREEZE FRV: Optimise the system call exit path in entry.S [ver #2] FRV: Shrink TIF_WORK_MASK [ver #2] FRV: Prevent syscall exit tracing and notify_resume at end of kernel exceptions new helper: signal_delivered() powerpc: get rid of restore_sigmask() most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set set_restore_sigmask() is never called without SIGPENDING (and never should be) TIF_RESTORE_SIGMASK can be set only when TIF_SIGPENDING is set don't call try_to_freeze() from do_signal() pull clearing RESTORE_SIGMASK into block_sigmask() sh64: failure to build sigframe != signal without handler openrisc: tracehook_signal_handler() is supposed to be called on success new helper: sigmask_to_save() new helper: restore_saved_sigmask() new helpers: {clear,test,test_and_clear}_restore_sigmask() HAVE_RESTORE_SIGMASK is defined on all architectures now
| * x86: get rid of calling do_notify_resume() when returning to kernel modeAl Viro2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we end up calling do_notify_resume() with !user_mode(refs), it does nothing (do_signal() explicitly bails out and we can't get there with TIF_NOTIFY_RESUME in such situations). Then we jump to resume_userspace_sig, which rechecks the same thing and bails out to resume_kernel, thus breaking the loop. It's easier and cheaper to check *before* calling do_notify_resume() and bail out to resume_kernel immediately. And kill the check in do_signal()... Note that on amd64 we can't get there with !user_mode() at all - asm glue takes care of that. Acked-and-reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * blackfin: check __get_user() return valueAl Viro2012-06-01
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * whack-a-mole with TIF_FREEZEAl Viro2012-06-01
| | | | | | | | | | | | blackfin has reintroduced it, completely unused. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * FRV: Optimise the system call exit path in entry.S [ver #2]David Howells2012-06-01
| | | | | | | | | | | | | | | | Optimise the system call exit path in entry.S by packing some instructions. Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * FRV: Shrink TIF_WORK_MASK [ver #2]David Howells2012-06-01
| | | | | | | | | | | | | | | | | | Shrink TIF_WORK_MASK so that it will fit in the 12-bit signed immediate operand field of an ANDI instruction. Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * FRV: Prevent syscall exit tracing and notify_resume at end of kernel exceptionsDavid Howells2012-06-01
| | | | | | | | | | | | | | | | | | | | Move the test for kernel mode processing from do_signal() into entry.S to also prevent system call exit tracing and userspace resumption notification handling happening when returning from kernel exceptions. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * new helper: signal_delivered()Al Viro2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Does block_sigmask() + tracehook_signal_handler(); called when sigframe has been successfully built. All architectures converted to it; block_sigmask() itself is gone now (merged into this one). I'm still not too happy with the signature, but that's a separate story (IMO we need a structure that would contain signal number + siginfo + k_sigaction, so that get_signal_to_deliver() would fill one, signal_delivered(), handle_signal() and probably setup...frame() - take one). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * powerpc: get rid of restore_sigmask()Al Viro2012-06-01
| | | | | | | | | | | | ... it's just a call of set_current_blocked() now Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from setAl Viro2012-06-01
| | | | | | | | | | | | | | | | Only 3 out of 63 do not. Renamed the current variant to __set_current_blocked(), added set_current_blocked() that will exclude unblockable signals, switched open-coded instances to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * set_restore_sigmask() is never called without SIGPENDING (and never should be)Al Viro2012-06-01
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * TIF_RESTORE_SIGMASK can be set only when TIF_SIGPENDING is setAl Viro2012-06-01
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * don't call try_to_freeze() from do_signal()Al Viro2012-06-01
| | | | | | | | | | | | get_signal_to_deliver() will handle it itself Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * pull clearing RESTORE_SIGMASK into block_sigmask()Al Viro2012-06-01
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * sh64: failure to build sigframe != signal without handlerAl Viro2012-06-01
| | | | | | | | | | | | it's actually "send me SIGSEGV"... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * openrisc: tracehook_signal_handler() is supposed to be called on successAl Viro2012-06-01
| | | | | | | | | | | | ... not if sigframe couldn't have been built. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * new helper: sigmask_to_save()Al Viro2012-06-01
| | | | | | | | | | | | | | replace boilerplate "should we use ->saved_sigmask or ->blocked?" with calls of obvious inlined helper... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * new helper: restore_saved_sigmask()Al Viro2012-06-01
| | | | | | | | | | | | | | | | | | first fruits of ..._restore_sigmask() helpers: now we can take boilerplate "signal didn't have a handler, clear RESTORE_SIGMASK and restore the blocked mask from ->saved_mask" into a common helper. Open-coded instances switched... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * new helpers: {clear,test,test_and_clear}_restore_sigmask()Al Viro2012-06-01
| | | | | | | | | | | | helpers parallel to set_restore_sigmask(), used in the next commits Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * HAVE_RESTORE_SIGMASK is defined on all architectures nowAl Viro2012-06-01
| | | | | | | | | | | | | | | | | | Everyone either defines it in arch thread_info.h or has TIF_RESTORE_SIGMASK and picks default set_restore_sigmask() in linux/thread_info.h. Kill the ifdefs, slap #error in linux/thread_info.h to catch breakage when new ones get merged. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'for-linus' of ↵Linus Torvalds2012-06-01
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs changes from Al Viro. "A lot of misc stuff. The obvious groups: * Miklos' atomic_open series; kills the damn abuse of ->d_revalidate() by NFS, which was the major stumbling block for all work in that area. * ripping security_file_mmap() and dealing with deadlocks in the area; sanitizing the neighborhood of vm_mmap()/vm_munmap() in general. * ->encode_fh() switched to saner API; insane fake dentry in mm/cleancache.c gone. * assorted annotations in fs (endianness, __user) * parts of Artem's ->s_dirty work (jff2 and reiserfs parts) * ->update_time() work from Josef. * other bits and pieces all over the place. Normally it would've been in two or three pull requests, but signal.git stuff had eaten a lot of time during this cycle ;-/" Fix up trivial conflicts in Documentation/filesystems/vfs.txt (the 'truncate_range' inode method was removed by the VM changes, the VFS update adds an 'update_time()' method), and in fs/btrfs/ulist.[ch] (due to sparse fix added twice, with other changes nearby). * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (95 commits) nfs: don't open in ->d_revalidate vfs: retry last component if opening stale dentry vfs: nameidata_to_filp(): don't throw away file on error vfs: nameidata_to_filp(): inline __dentry_open() vfs: do_dentry_open(): don't put filp vfs: split __dentry_open() vfs: do_last() common post lookup vfs: do_last(): add audit_inode before open vfs: do_last(): only return EISDIR for O_CREAT vfs: do_last(): check LOOKUP_DIRECTORY vfs: do_last(): make ENOENT exit RCU safe vfs: make follow_link check RCU safe vfs: do_last(): use inode variable vfs: do_last(): inline walk_component() vfs: do_last(): make exit RCU safe vfs: split do_lookup() Btrfs: move over to use ->update_time fs: introduce inode operation ->update_time reiserfs: get rid of resierfs_sync_super reiserfs: mark the superblock as dirty a bit later ...
| * | nfs: don't open in ->d_revalidateMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NFSv4 can't do reliable opens in d_revalidate, since it cannot know whether a mount needs to be followed or not. It does check d_mountpoint() on the dentry, which can result in a weird error if the VFS found that the mount does not in fact need to be followed, e.g.: # mount --bind /mnt/nfs /mnt/nfs-clone # echo something > /mnt/nfs/tmp/bar # echo x > /tmp/file # mount --bind /tmp/file /mnt/nfs-clone/tmp/bar # cat /mnt/nfs/tmp/bar cat: /mnt/nfs/tmp/bar: Not a directory Which should, by any sane filesystem, result in "something" being printed. So instead do the open in f_op->open() and in the unlikely case that the cached dentry turned out to be invalid, drop the dentry and return EOPENSTALE to let the VFS retry. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: retry last component if opening stale dentryMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NFS optimizes away d_revalidates for last component of open. This means that open itself can find the dentry stale. This patch allows the filesystem to return EOPENSTALE and the VFS will retry the lookup on just the last component if possible. If the lookup was done using RCU mode, including the last component, then this is not possible since the parent dentry is lost. In this case fall back to non-RCU lookup. Currently this is not used since NFS will always leave RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: nameidata_to_filp(): don't throw away file on errorMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | If open fails, don't put the file. This allows it to be reused if open needs to be retried. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: nameidata_to_filp(): inline __dentry_open()Miklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | Copy __dentry_open() into nameidata_to_filp(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_dentry_open(): don't put filpMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | Move put_filp() out to __dentry_open(), the only caller now. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: split __dentry_open()Miklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split __dentry_open() into two functions: do_dentry_open() - does most of the actual work, doesn't put file on failure open_check_o_direct() - after a successful open, checks direct_IO method This will allow i_op->atomic_open to do just the file initialization and leave the direct_IO checking to the VFS. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last() common post lookupMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | Now the post lookup code can be shared between O_CREAT and plain opens since they are essentially the same. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): add audit_inode before openMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): only return EISDIR for O_CREATMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): check LOOKUP_DIRECTORYMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | Check for ENOTDIR before finishing open. This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): make ENOENT exit RCU safeMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: make follow_link check RCU safeMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): use inode variableMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | Use helper variable instead of path->dentry->d_inode before complete_walk(). This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): inline walk_component()Miklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | Copy walk_component() into do_lookup(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: do_last(): make exit RCU safeMiklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | Allow returning from do_last() with LOOKUP_RCU still set on the "out:" and "exit:" labels. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: split do_lookup()Miklos Szeredi2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split do_lookup() into two functions: lookup_fast() - does cached lookup without i_mutex lookup_slow() - does lookup with i_mutex Both follow managed dentries. The new functions are needed by atomic_open. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | Btrfs: move over to use ->update_timeJosef Bacik2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | Btrfs had been doing it's own file_update_time so we could catch ENOSPC properly, so just update our btrfs_update_time to work with the new stuff and then we'll be fancy later. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
| * | fs: introduce inode operation ->update_timeJosef Bacik2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Btrfs has to make sure we have space to allocate new blocks in order to modify the inode, so updating time can fail. We've gotten around this by having our own file_update_time but this is kind of a pain, and Christoph has indicated he would like to make xfs do something different with atime updates. So introduce ->update_time, where we will deal with i_version an a/m/c time updates and indicate which changes need to be made. The normal version just does what it has always done, updates the time and marks the inode dirty, and then filesystems can choose to do something different. I've gone through all of the users of file_update_time and made them check for errors with the exception of the fault code since it's complicated and I wasn't quite sure what to do there, also Jan is going to be pushing the file time updates into page_mkwrite for those who have it so that should satisfy btrfs and make it not a big deal to check the file_update_time() return code in the generic fault path. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
| * | reiserfs: get rid of resierfs_sync_superArtem Bityutskiy2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch stops reiserfs using the VFS 'write_super()' method along with the s_dirt flag, because they are on their way out. The whole "superblock write-out" VFS infrastructure is served by the 'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and writes out all dirty superblock using the '->write_super()' call-back. But the problem with this thread is that it wastes power by waking up the system every 5 seconds, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). So we want to kill it completely and thus, we need to make file-systems to stop using the '->write_super()' VFS service, and then remove it together with the kernel thread. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | reiserfs: mark the superblock as dirty a bit laterArtem Bityutskiy2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The 'journal_mark_dirty()' function currently first marks the superblock as dirty by setting 's_dirt' to 1, then does various sanity checks and returns, then actuall does all the magic with the journal. This is not an ideal order, though. It makes more sense to first do all the checks, then do all the internal stuff, and at the end notify the VFS that the superblock is now dirty. This patch moves the 's_dirt = 1' assignment from the very beginning of this function to the very end. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | reiserfs: remove useless superblock dirtyingArtem Bityutskiy2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | The 'reiserfs_resize()' function marks the superblock as dirty by assigning 1 to 's_dirt' and then calls 'journal_mark_dirty()' which does the same. Thus, we can remove the assignment from 'reiserfs_resize()'. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | reiserfs: clean-up function return typeArtem Bityutskiy2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Turn 'reiserfs_flush_old_commits()' into a void function because the callers do not cares about what it returns anyway. We are going to remove the 'sb->s_dirt' field completely and this patch is a small step towards this direction. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | reiserfs: cleanup reiserfs_fill_super a bitArtem Bityutskiy2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | We have the reiserfs superblock pointer in the 'sbi' variable in this function, no need to use the 'REISERFS_SB(s)' macro which is the same. This is jut a small clean-up. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | sch_atm.c: get rid of poinless externAl Viro2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | sockfd_lookup() is declared in linux/net.h, which is pulled by linux/skbuff.h (and needed for a lot of other stuff in sch_atm.c anyway). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | unexport do_munmap()Al Viro2012-06-01
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | new helper: vm_mmap_pgoff()Al Viro2012-06-01
| | | | | | | | | | | | | | | | | | | | | | | | take it to mm/util.c, convert vm_mmap() to use of that one and take it to mm/util.c as well, convert both sys_mmap_pgoff() to use of vm_mmap_pgoff() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | kill do_mmap() completelyAl Viro2012-06-01
| | | | | | | | | | | | | | | | | | just pull into vm_mmap() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | switch aio and shm to do_mmap_pgoff(), make do_mmap() staticAl Viro2012-06-01
| | | | | | | | | | | | | | | | | | after all, 0 bytes and 0 pages is the same thing... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | take calculation of final prot in security_mmap_file() into a helperAl Viro2012-06-01
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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