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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 Kelly2012-10-023-645/+688
| | | | | | | | | | | | | | 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>
* 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>
* 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 Viro2012-09-2628-562/+459
| | | | Signed-off-by: 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 Viro2012-09-265-10/+5
| | | | | | simplifies a bunch of callers... 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 btrfs_ioctl_clone() to fget_light()Al Viro2012-09-261-3/+3
| | | | 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 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 Viro2012-09-261-0/+6
| | | | | | | | 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>
* 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 Viro2012-09-261-0/+21
| | | | | | | | | | | | | 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 Viro2012-09-261-2/+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 Viro2012-09-261-0/+20
| | | | | | nobody uses those outside anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: replace_fd()Al Viro2012-09-262-39/+63
| | | | | | analog of dup2(), except that it takes struct file * as source. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take purely descriptor-related stuff from fcntl.c to file.cAl Viro2012-09-262-128/+135
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take close-on-exec logics to fs/file.c, clean it up a bitAl Viro2012-09-262-35/+43
| | | | | | | ... and add cond_resched() there, while we are at it. We can get large latencies as is... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take descriptor-related part of close() to file.cAl Viro2012-09-262-21/+27
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take fget() and friends to fs/file.cAl Viro2012-09-262-106/+106
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* expose a low-level variant of fd_install() for binderAl Viro2012-09-261-2/+14
| | | | | | | | | | | | | | Similar situation to that of __alloc_fd(); do not use unless you really have to. You should not touch any descriptor table other than your own; it's a sure sign of a really bad API design. As with __alloc_fd(), you *must* use a first-class reference to struct files_struct; something obtained by get_files_struct(some task) (let alone direct task->files) will not do. It must be either current->files, or obtained by get_files_struct(current) by the owner of that sucker and given to you. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* move put_unused_fd() and fd_install() to fs/file.cAl Viro2012-09-262-44/+44
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* trim free_fdtable_rcu()Al Viro2012-09-261-15/+2
| | | | | | embedded case isn't hit anymore Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* don't bother with call_rcu() in put_files_struct()Al Viro2012-09-261-9/+5
| | | | | | | | | | | At that point nobody can see us anyway; everything that looks at files_fdtable(files) is separated from the guts of put_files_struct(files) - either since files is current->files or because we fetched it under task_lock() and hadn't dropped that yet, or because we'd bumped files->count while holding task_lock()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* move files_struct-related bits from kernel/exit.c to fs/file.cAl Viro2012-09-261-1/+99
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: __alloc_fd()Al Viro2012-09-261-4/+8
| | | | | | | | | | | Essentially, alloc_fd() in a files_struct we own a reference to. Most of the time wanting to use it is a sign of lousy API design (such as android/binder). It's *not* a general-purpose interface; better that than open-coding its guts, but again, playing with other process' descriptor table is a sign of bad design. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* take rlimit check to callers of expand_files()Al Viro2012-09-262-7/+12
| | | | | | | | ... except for one in android, where the check is different and already done in caller. No need to recalculate rlimit many times in alloc_fd() either. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fanotify: sanitize failure exits in copy_event_to_user()Al Viro2012-09-261-39/+20
| | | | | | | | | | * do copy_to_user() before prepare_for_access_response(); that kills the need in remove_access_response(). * don't do fd_install() until we are past the last possible failure exit. Don't use sys_close() on cleanup side - just put_unused_fd() and fput(). Less racy that way... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* pipe(2) - race-free error recoveryAl Viro2012-09-261-9/+22
| | | | | | | don't mess with sys_close() if copy_to_user() fails; just postpone fd_install() until we know it hasn't. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* autofs4: don't open-code fd_install()Al Viro2012-09-261-16/+2
| | | | | | | | | The only difference between autofs_dev_ioctl_fd_install() and fd_install() is __set_close_on_exec() done by the latter. Just use get_unused_fd_flags(O_CLOEXEC) to allocate the descriptor and be done with that... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* make get_unused_fd_flags() a functionAl Viro2012-09-261-3/+3
| | | | | | ... and get_unused_fd() a macro around it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge remote branch 'origin' into for-nextAl Viro2012-09-2681-672/+804
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