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* Merge branch 'for-linus' of ↵Linus Torvalds2012-06-013-12/+0Star
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
| * HAVE_RESTORE_SIGMASK is defined on all architectures nowAl Viro2012-06-013-12/+0Star
| | | | | | | | | | | | | | | | | | 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 Torvalds2012-06-0189-1081/+1175
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-012-55/+78
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-2/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-2/+18
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-1/+2
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-012-14/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-31/+3Star
| | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-0/+1
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-1/+1
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-2/+4
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-2/+10
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-5/+30
| | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | 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 Szeredi2012-06-011-14/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bacik2012-06-013-41/+15Star
| | | | | | | | | | | | | | | | | | | | | | | | 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 Bacik2012-06-017-26/+64
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bityutskiy2012-06-013-11/+55
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bityutskiy2012-06-011-2/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bityutskiy2012-06-011-1/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bityutskiy2012-06-012-6/+4Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Bityutskiy2012-06-011-10/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | switch aio and shm to do_mmap_pgoff(), make do_mmap() staticAl Viro2012-06-011-3/+3
| | | | | | | | | | | | | | | | | | after all, 0 bytes and 0 pages is the same thing... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | split ->file_mmap() into ->mmap_addr()/->mmap_file()Al Viro2012-05-311-4/+0Star
| | | | | | | | | | | | | | | | | | ... i.e. file-dependent and address-dependent checks. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | binfmt_flat: use vm_munmap, we are missing ->mmap_sem thereAl Viro2012-05-311-4/+4
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | binfmt_elf: switch elf_map() to vm_mmap/vm_munmapAl Viro2012-05-311-5/+3Star
| | | | | | | | | | | | | | | | | | No reason to hold ->mmap_sem over the sequence Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: umount_tree() might be called on subtree that had never made itAl Viro2012-05-311-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | __mnt_make_shortterm() in there undoes the effect of __mnt_make_longterm() we'd done back when we set ->mnt_ns non-NULL; it should not be done to vfsmounts that had never gone through commit_tree() and friends. Kudos to lczerner for catching that one... Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | pipe: return -ENOIOCTLCMD instead of -EINVAL on unknown ioctl commandWill Deacon2012-05-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As described in commit 07d106d0a ("vfs: fix up ENOIOCTLCMD error handling"), drivers should return -ENOIOCTLCMD if they receive an ioctl command which they don't understand. Doing so will result in -ENOTTY being returned to userspace, which matches the behaviour of the compat layer if it fails to translate an ioctl command. This patch fixes the pipe ioctl to return -ENOIOCTLCMD instead of -EINVAL when passed an unknown ioctl command. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: remove unused __d_splice_alias argumentJ. Bruce Fields2012-05-311-8/+5Star
| | | | | | | | | | | | | | | | | | | | | | | | Nobody sets want_disconn any more. Reported-by: Peng Tao <bergwolf@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: stop d_splice_alias creating directory aliasesJ. Bruce Fields2012-05-311-2/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A directory should never have more than one dentry pointing to it. But d_splice_alias() will add one if it finds a directory with an already-existing non-DISCONNECTED dentry. I can't find an obvious reproducer, but I also can't see what prevents d_splice_alias() from encountering such a case. It therefore seems safest to allow d_splice_alias to use any dentry it finds. (Prior to the removal of dentry_unhash() from vfs_rmdir(), around v3.0, this could cause an nfsd deadlock like this: - Somebody attempts to remove a non-empty directory. - The dentry_unhash() in vfs_rmdir() unhashes the dentry pointing to the non-empty directory. - ->rmdir() then fails with -ENOTEMPTY - Before the vfs_rmdir() caller reaches dput(), an nfsd process in rename looks up the directory by filehandle; at the end of that lookup, this dentry is found by d_alloc_anon(), and a reference is taken on it, preventing dput() from removing it. - A regular lookup of the directory calls d_splice_alias(), finds only an unhashed (not a DISCONNECTED) dentry, and insteads adds a new one, so the directory now has two dentries. - The nfsd process in rename, which was previously looking up the source directory of the rename, now looks up the target directory (which is the same), and gets the dentry newly created by the previous lookup. - The rename, seeing two different dentries, assumes this is a cross-directory rename and attempts to take the i_mutex on the directory twice. That reproducer no longer exists, but I don't think there was anything fundamentally incorrect about the vfs_rmdir() behavior there, so I think the real fault was here in d_splice_alias().) Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fsnotify: remove unused parameter from send_to_group()Dan Carpenter2012-05-311-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't use "mnt" anymore in send_to_group() after 1968f5eed5 ("fanotify: use both marks when possible") was applied. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | vfs: increment iversion when a file is truncatedDmitry Kasatkin2012-05-311-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a file is truncated with truncate()/ftruncate() and then closed, iversion is not updated. This patch uses ATTR_SIZE flag as an indication to increment iversion. Mimi said: On fput(), i_version is used to detect and flag files that have changed and need to be re-measured in the IMA measurement policy. When a file is truncated with truncate()/ftruncate() and then closed, i_version is not updated. As a result, although the file has changed, it will not be re-measured and added to the IMA measurement list on subsequent access. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Acked-by: Mimi Zohar <zohar@us.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fs: Move bh_cachep to the __read_mostly sectionShai Fultheim2012-05-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | bh_cachep is only written to once on initialization, so move it to the __read_mostly section. Signed-off-by: Shai Fultheim <shai@scalemp.com> Signed-off-by: Vlad Zolotarov <vlad@scalemp.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fs: move file_remove_suid() to fs/inode.cCong Wang2012-05-311-0/+65
| | | | | | | | | | | | | | | | | | | | | | | | | | | file_remove_suid() is a generic function operates on struct file, it almost has no relations with file mapping, so move it to fs/inode.c. Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | jffs2: get rid of jffs2_sync_superArtem Bityutskiy2012-05-314-21/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently JFFS2 file-system maps the VFS "superblock" abstraction to the write-buffer. Namely, it uses VFS services to synchronize the write-buffer periodically. 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 no matter what. 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. This patch switches the JFFS2 write-buffer management from '->write_super()'/'->s_dirt' to a delayed work. Instead of setting the 's_dirt' flag we just schedule a delayed work for synchronizing the write-buffer. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | jffs2: remove unnecessary GC pass on syncArtem Bityutskiy2012-05-311-2/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We do not need to call 'jffs2_write_super()' on sync. This function causes a GC pass to make sure the current contents is pushed out with the data which we already have on the media. But this is not needed on unmount and only slows sync down unnecessarily. It is enough to just sync the write-buffer. This call was added by one of the generic VFS rework patch-sets, see d579ed00aa96a7f7486978540a0d7cecaff742ae. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | jffs2: remove unnecessary GC pass on umountArtem Bityutskiy2012-05-311-3/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We do not need to call 'jffs2_write_super()' on unmount. This function causes a GC pass to make sure the current contents is pushed out with the data which we already have on the media. But this is not needed on unmount and only slows unmount down unnecessarily. It is enough to just sync the write-buffer. This call was added by one of the generic VFS rework patch-sets, see 8c85e125124a473d6f3e9bb187b0b84207f81d91. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | jffs2: remove lock_superArtem Bityutskiy2012-05-311-3/+0Star
| | | | | | | | | | | | | | | | | | | | | We do not need 'lock_super()'/'unlock_super()' in JFFS2 - kill them. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | get rid of idiotic misplaced __kernel_mode_t in ncfps kernel-private data ↵Al Viro2012-05-301-5/+5
| | | | | | | | | | | | | | | | | | structure Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | brlocks/lglocks: API cleanupsAndi Kleen2012-05-306-95/+96
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | lglocks and brlocks are currently generated with some complicated macros in lglock.h. But there's no reason to not just use common utility functions and put all the data into a common data structure. In preparation, this patch changes the API to look more like normal function calls with pointers, not magic macros. The patch is rather large because I move over all users in one go to keep it bisectable. This impacts the VFS somewhat in terms of lines changed. But no actual behaviour change. [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | brlocks/lglocks: turn into functionsAndi Kleen2012-05-302-2/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | lglocks and brlocks are currently generated with some complicated macros in lglock.h. But there's no reason to not just use common utility functions and put all the data into a common data structure. Since there are at least two users it makes sense to share this code in a library. This is also easier maintainable than a macro forest. This will also make it later possible to dynamically allocate lglocks and also use them in modules (this would both still need some additional, but now straightforward, code) [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ocfs: simplify symlink handlingAl Viro2012-05-304-104/+31Star
| | | | | | | | | | | | | | | | | | | | | | | | seeing that "fast" symlinks still get allocation + copy, we might as well simply switch them to pagecache-based variant of ->follow_link(); just need an appropriate ->readpage() for them... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | get rid of pointless allocations and copying in ecryptfs_follow_link()Al Viro2012-05-301-39/+9Star
| | | | | | | | | | | | | | | | | | switch to generic_readlink(), while we are at it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | hpfs: assorted endianness annotationsAl Viro2012-05-304-60/+60
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | hpfs: annotate eaAl Viro2012-05-301-2/+2
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | hpfs: annotate struct hpfs_direntAl Viro2012-05-303-12/+12
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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