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* fs: push rcu_barrier() from deactivate_locked_super() to filesystemsKirill A. Shutemov2012-10-0247-6/+240
| | | | | | | | | | | | | | | There's no reason to call rcu_barrier() on every deactivate_locked_super(). We only need to make sure that all delayed rcu free inodes are flushed before we destroy related cache. Removing rcu_barrier() from deactivate_locked_super() affects some fast paths. E.g. on my machine exit_group() of a last process in IPC namespace takes 0.07538s. rcu_barrier() takes 0.05188s of that time. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.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>
* btrfs: reada_extent doesn't need kref for refcountAl Viro2012-10-021-11/+7
| | | | | | | | All increments and decrements are under the same spinlock - have to be, since they need to protect the radix_tree it's found in. Just use int, no need to wank with kref... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* coredump: move core dump functionality into its own fileAlex Kelly2012-10-024-645/+689
| | | | | | | | | | | | | | This prepares for making core dump functionality optional. The variable "suid_dumpable" and associated functions are left in fs/exec.c because they're used elsewhere, such as in ptrace. Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* coredump: prevent double-free on an error path in core dumperDenys Vlasenko2012-09-261-15/+4
| | | | | | | | | | | | | | | | | In !CORE_DUMP_USE_REGSET case, if elf_note_info_init fails to allocate memory for info->fields, it frees already allocated stuff and returns error to its caller, fill_note_info. Which in turn returns error to its caller, elf_core_dump. Which jumps to cleanup label and calls free_note_info, which will happily try to free all info->fields again. BOOM. This is the fix. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Cc: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* usb/gadget: fix misannotationsAl Viro2012-09-261-2/+2
| | | | | | __user * != * __user Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fcntl: fix misannotationsAl Viro2012-09-261-3/+3
| | | | | | __user * != * __user... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* ceph: don't abuse d_delete() on failure exitsAl Viro2012-09-261-2/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* hypfs: ->d_parent is never NULL or negativeAl Viro2012-09-261-2/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* vfs: delete surplus inode NULL checkAlan Cox2012-09-261-1/+1
| | | | | | | | | Each iteration of d_delete we reload inode from dentry->d_inode and then call S_ISDIR(inode-i_mode), so inode cannot possibly be NULL shortly afterwards unless something went horribly wrong. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch simple cases of fget_light to fdgetAl Viro2012-09-2644-763/+633
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helpers: fdget()/fdput()Al Viro2012-09-261-0/+26
| | | | Signed-off-bs: Al Viro <viro@zeniv.linux.org.uk>
* switch o2hb_region_dev_write() to fget_light()Al Viro2012-09-261-2/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc_map_files_readdir(): don't bother with grabbing filesAl Viro2012-09-261-19/+9
| | | | | | all we need is their ->f_mode, so just collect _that_ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* make get_file() return its argumentAl Viro2012-09-2616-38/+23
| | | | | | simplifies a bunch of callers... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* vhost_set_vring(): turn pollstart/pollstop into boolAl Viro2012-09-261-4/+4
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch prctl_set_mm_exe_file() to fget_light()Al Viro2012-09-261-4/+4
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch xfs_find_handle() to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch xfs_swapext() to fget_light()Al Viro2012-09-261-5/+5
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch coda get_device_index() to fget_light()Al Viro2012-09-261-17/+15
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch infinibarf users of fget() to fget_light()Al Viro2012-09-263-14/+10
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch vfio_group_set_container() to fget_light()Al Viro2012-09-261-4/+4
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch btrfs_ioctl_clone() to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch mqueue syscalls to fget_light()Al Viro2012-09-261-12/+14
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch SNDRV_PCM_IOCTL_LINK to fget_light()Al Viro2012-09-261-6/+7
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch timerfd_[sg]ettime(2) to fget_light()Al Viro2012-09-261-8/+9
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch epoll_wait(2) to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch btrfs_ioctl_snap_create_transid() to fget_light()Al Viro2012-09-261-7/+7
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch EXT4_IOC_MOVE_EXT to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* export fget_lightAl Viro2012-09-261-0/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* ext4: close struct file leak on EXT4_IOC_MOVE_EXTAl Viro2012-09-261-1/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch hpux_getdents() to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch itanic perfmonctl(2) to fget_light()Al Viro2012-09-261-2/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch osf_getdirentries() to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch readahead(2) to fget_light()Al Viro2012-09-261-2/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch fadvise(2) to fget_light()Al Viro2012-09-261-2/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch fchmod(2) to fget_light()Al Viro2012-09-261-7/+5
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch fallocate(2) to fget_light()Al Viro2012-09-261-3/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch ftruncate(2) to fget_lightAl Viro2012-09-261-5/+5
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* namei.c: fix BS commentAl Viro2012-09-261-1/+1
| | | | | | | get_write_access() is needed for nfsd, not binfmt_aout (the latter has no business doing anything of that kind, of course) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* don't leak O_CLOEXEC into ->f_flagsAl Viro2012-09-262-2/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* procfs: Convert /proc/pid/fdinfo/ handling routines to seq-file v2Cyrill Gorcunov2012-09-261-48/+64
| | | | | | | | | | | This patch converts /proc/pid/fdinfo/ handling routines to seq-file which is needed to extend seq operations and plug in auxiliary fdinfo provides from subsystems like eventfd/eventpoll/fsnotify. Note the proc_fd_link no longer call for proc_fd_info, simply because the guts of proc_fd_info() got merged into ->show() of that seq_file Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* procfs: Move /proc/pid/fd[info] handling code to fd.[ch]Cyrill Gorcunov2012-09-265-387/+416
| | | | | | | | | | | | | | | | | | | | | | This patch prepares the ground for further extension of /proc/pid/fd[info] handling code by moving fdinfo handling code into fs/proc/fd.c. I think such move makes both fs/proc/base.c and fs/proc/fd.c easier to read. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Alexey Dobriyan <adobriyan@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> CC: James Bottomley <jbottomley@parallels.com> CC: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> CC: Alexey Dobriyan <adobriyan@gmail.com> CC: Matthew Helsley <matt.helsley@gmail.com> CC: "J. Bruce Fields" <bfields@fieldses.org> CC: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: daemonize_descriptors()Al Viro2012-09-263-3/+8
| | | | | | | | descriptor-related parts of daemonize, done right. As the result we simplify the locking rules for ->files - we hold task_lock in *all* cases when we modify ->files. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch spufs/coredump to iterate_fd()Al Viro2012-09-261-20/+20
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* do_coredump(): make sure that descriptor table isn't sharedAl Viro2012-09-261-0/+7
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: iterate_fd()Al Viro2012-09-265-84/+71
| | | | | | | | | | | | | iterates through the opened files in given descriptor table, calling a supplied function; we stop once non-zero is returned. Callback gets struct file *, descriptor number and const void * argument passed to iterator. It is called with files->file_lock held, so it is not allowed to block. tty_io, netprio_cgroup and selinux flush_unauthorized_files() converted to its use. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* make expand_files() and alloc_fd() staticAl Viro2012-09-263-4/+2
| | | | | | no callers outside of fs/file.c left Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take __{set,clear}_{open_fd,close_on_exec}() into fs/file.cAl Viro2012-09-262-20/+20
| | | | | | nobody uses those outside anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch flush_unauthorized_files() to replace_fd()Al Viro2012-09-261-32/+15
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: replace_fd()Al Viro2012-09-263-39/+64
| | | | | | analog of dup2(), except that it takes struct file * as source. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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