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-----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCZem4/wAKCRCRxhvAZXjc opnBAQCaQWwxjT0VLHebPniw6tel/KYlZ9jH9kBQwLrk1pembwEA+BsCY2C8YS4a 75v9jOPxr+Z8j1SjxwwubcONPyqYXwQ= =+Wa3 -----END PGP SIGNATURE----- Merge tag 'vfs-6.9.pidfd' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull pdfd updates from Christian Brauner: - Until now pidfds could only be created for thread-group leaders but not for threads. There was no technical reason for this. We simply had no users that needed support for this. Now we do have users that need support for this. This introduces a new PIDFD_THREAD flag for pidfd_open(). If that flag is set pidfd_open() creates a pidfd that refers to a specific thread. In addition, we now allow clone() and clone3() to be called with CLONE_PIDFD | CLONE_THREAD which wasn't possible before. A pidfd that refers to an individual thread differs from a pidfd that refers to a thread-group leader: (1) Pidfds are pollable. A task may poll a pidfd and get notified when the task has exited. For thread-group leader pidfds the polling task is woken if the thread-group is empty. In other words, if the thread-group leader task exits when there are still threads alive in its thread-group the polling task will not be woken when the thread-group leader exits but rather when the last thread in the thread-group exits. For thread-specific pidfds the polling task is woken if the thread exits. (2) Passing a thread-group leader pidfd to pidfd_send_signal() will generate thread-group directed signals like kill(2) does. Passing a thread-specific pidfd to pidfd_send_signal() will generate thread-specific signals like tgkill(2) does. The default scope of the signal is thus determined by the type of the pidfd. Since use-cases exist where the default scope of the provided pidfd needs to be overriden the following flags are added to pidfd_send_signal(): - PIDFD_SIGNAL_THREAD Send a thread-specific signal. - PIDFD_SIGNAL_THREAD_GROUP Send a thread-group directed signal. - PIDFD_SIGNAL_PROCESS_GROUP Send a process-group directed signal. The scope change will only work if the struct pid is actually used for this scope. For example, in order to send a thread-group directed signal the provided pidfd must be used as a thread-group leader and similarly for PIDFD_SIGNAL_PROCESS_GROUP the struct pid must be used as a process group leader. - Move pidfds from the anonymous inode infrastructure to a tiny pseudo filesystem. This will unblock further work that we weren't able to do simply because of the very justified limitations of anonymous inodes. Moving pidfds to a tiny pseudo filesystem allows for statx on pidfds to become useful for the first time. They can now be compared by inode number which are unique for the system lifetime. Instead of stashing struct pid in file->private_data we can now stash it in inode->i_private. This makes it possible to introduce concepts that operate on a process once all file descriptors have been closed. A concrete example is kill-on-last-close. Another side-effect is that file->private_data is now freed up for per-file options for pidfds. Now, each struct pid will refer to a different inode but the same struct pid will refer to the same inode if it's opened multiple times. In contrast to now where each struct pid refers to the same inode. The tiny pseudo filesystem is not visible anywhere in userspace exactly like e.g., pipefs and sockfs. There's no lookup, there's no complex inode operations, nothing. Dentries and inodes are always deleted when the last pidfd is closed. We allocate a new inode and dentry for each struct pid and we reuse that inode and dentry for all pidfds that refer to the same struct pid. The code is entirely optional and fairly small. If it's not selected we fallback to anonymous inodes. Heavily inspired by nsfs. The dentry and inode allocation mechanism is moved into generic infrastructure that is now shared between nsfs and pidfs. The path_from_stashed() helper must be provided with a stashing location, an inode number, a mount, and the private data that is supposed to be used and it will provide a path that can be passed to dentry_open(). The helper will try retrieve an existing dentry from the provided stashing location. If a valid dentry is found it is reused. If not a new one is allocated and we try to stash it in the provided location. If this fails we retry until we either find an existing dentry or the newly allocated dentry could be stashed. Subsequent openers of the same namespace or task are then able to reuse it. - Currently it is only possible to get notified when a task has exited, i.e., become a zombie and userspace gets notified with EPOLLIN. We now also support waiting until the task has been reaped, notifying userspace with EPOLLHUP. - Ensure that ESRCH is reported for getfd if a task is exiting instead of the confusing EBADF. - Various smaller cleanups to pidfd functions. * tag 'vfs-6.9.pidfd' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (23 commits) libfs: improve path_from_stashed() libfs: add stashed_dentry_prune() libfs: improve path_from_stashed() helper pidfs: convert to path_from_stashed() helper nsfs: convert to path_from_stashed() helper libfs: add path_from_stashed() pidfd: add pidfs pidfd: move struct pidfd_fops pidfd: allow to override signal scope in pidfd_send_signal() pidfd: change pidfd_send_signal() to respect PIDFD_THREAD signal: fill in si_code in prepare_kill_siginfo() selftests: add ESRCH tests for pidfd_getfd() pidfd: getfd should always report ESRCH if a task is exiting pidfd: clone: allow CLONE_THREAD | CLONE_PIDFD together pidfd: exit: kill the no longer used thread_group_exited() pidfd: change do_notify_pidfd() to use __wake_up(poll_to_key(EPOLLIN)) pid: kill the obsolete PIDTYPE_PID code in transfer_pid() pidfd: kill the no longer needed do_notify_pidfd() in de_thread() pidfd_poll: report POLLHUP when pid_task() == NULL pidfd: implement PIDFD_THREAD flag for pidfd_open() ...
132 lines
4.4 KiB
Makefile
132 lines
4.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the Linux filesystems.
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#
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# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
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# Rewritten to use lists instead of if-statements.
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#
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obj-y := open.o read_write.o file_table.o super.o \
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char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
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ioctl.o readdir.o select.o dcache.o inode.o \
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attr.o bad_inode.o file.o filesystems.o namespace.o \
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seq_file.o xattr.o libfs.o fs-writeback.o \
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pnode.o splice.o sync.o utimes.o d_path.o \
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stack.o fs_struct.o statfs.o fs_pin.o nsfs.o \
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fs_types.o fs_context.o fs_parser.o fsopen.o init.o \
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kernel_read_file.o mnt_idmapping.o remap_range.o pidfs.o
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obj-$(CONFIG_BUFFER_HEAD) += buffer.o mpage.o
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obj-$(CONFIG_PROC_FS) += proc_namespace.o
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obj-$(CONFIG_LEGACY_DIRECT_IO) += direct-io.o
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obj-y += notify/
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obj-$(CONFIG_EPOLL) += eventpoll.o
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obj-y += anon_inodes.o
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obj-$(CONFIG_SIGNALFD) += signalfd.o
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obj-$(CONFIG_TIMERFD) += timerfd.o
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obj-$(CONFIG_EVENTFD) += eventfd.o
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obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
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obj-$(CONFIG_AIO) += aio.o
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obj-$(CONFIG_FS_DAX) += dax.o
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obj-$(CONFIG_FS_ENCRYPTION) += crypto/
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obj-$(CONFIG_FS_VERITY) += verity/
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obj-$(CONFIG_FILE_LOCKING) += locks.o
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obj-$(CONFIG_BINFMT_MISC) += binfmt_misc.o
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obj-$(CONFIG_BINFMT_SCRIPT) += binfmt_script.o
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obj-$(CONFIG_BINFMT_ELF) += binfmt_elf.o
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obj-$(CONFIG_COMPAT_BINFMT_ELF) += compat_binfmt_elf.o
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obj-$(CONFIG_BINFMT_ELF_FDPIC) += binfmt_elf_fdpic.o
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obj-$(CONFIG_BINFMT_FLAT) += binfmt_flat.o
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obj-$(CONFIG_FS_STACK) += backing-file.o
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obj-$(CONFIG_FS_MBCACHE) += mbcache.o
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obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o
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obj-$(CONFIG_NFS_COMMON) += nfs_common/
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obj-$(CONFIG_COREDUMP) += coredump.o
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obj-$(CONFIG_SYSCTL) += drop_caches.o sysctls.o
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obj-$(CONFIG_FHANDLE) += fhandle.o
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obj-y += iomap/
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obj-y += quota/
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obj-$(CONFIG_PROC_FS) += proc/
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obj-$(CONFIG_KERNFS) += kernfs/
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obj-$(CONFIG_SYSFS) += sysfs/
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obj-$(CONFIG_CONFIGFS_FS) += configfs/
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obj-y += devpts/
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obj-$(CONFIG_DLM) += dlm/
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# Do not add any filesystems before this line
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obj-$(CONFIG_NETFS_SUPPORT) += netfs/
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obj-$(CONFIG_REISERFS_FS) += reiserfs/
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obj-$(CONFIG_EXT4_FS) += ext4/
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# We place ext4 before ext2 so that clean ext3 root fs's do NOT mount using the
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# ext2 driver, which doesn't know about journalling! Explicitly request ext2
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# by giving the rootfstype= parameter.
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obj-$(CONFIG_EXT2_FS) += ext2/
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obj-$(CONFIG_JBD2) += jbd2/
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obj-$(CONFIG_CRAMFS) += cramfs/
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obj-$(CONFIG_SQUASHFS) += squashfs/
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obj-y += ramfs/
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obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
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obj-$(CONFIG_CODA_FS) += coda/
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obj-$(CONFIG_MINIX_FS) += minix/
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obj-$(CONFIG_FAT_FS) += fat/
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obj-$(CONFIG_EXFAT_FS) += exfat/
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obj-$(CONFIG_BFS_FS) += bfs/
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obj-$(CONFIG_ISO9660_FS) += isofs/
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obj-$(CONFIG_HFSPLUS_FS) += hfsplus/ # Before hfs to find wrapped HFS+
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obj-$(CONFIG_HFS_FS) += hfs/
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obj-$(CONFIG_ECRYPT_FS) += ecryptfs/
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obj-$(CONFIG_VXFS_FS) += freevxfs/
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obj-$(CONFIG_NFS_FS) += nfs/
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obj-$(CONFIG_EXPORTFS) += exportfs/
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obj-$(CONFIG_NFSD) += nfsd/
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obj-$(CONFIG_LOCKD) += lockd/
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obj-$(CONFIG_NLS) += nls/
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obj-y += unicode/
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obj-$(CONFIG_SYSV_FS) += sysv/
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obj-$(CONFIG_SMBFS) += smb/
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obj-$(CONFIG_HPFS_FS) += hpfs/
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obj-$(CONFIG_NTFS3_FS) += ntfs3/
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obj-$(CONFIG_UFS_FS) += ufs/
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obj-$(CONFIG_EFS_FS) += efs/
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obj-$(CONFIG_JFFS2_FS) += jffs2/
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obj-$(CONFIG_UBIFS_FS) += ubifs/
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obj-$(CONFIG_AFFS_FS) += affs/
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obj-$(CONFIG_ROMFS_FS) += romfs/
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obj-$(CONFIG_QNX4FS_FS) += qnx4/
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obj-$(CONFIG_QNX6FS_FS) += qnx6/
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obj-$(CONFIG_AUTOFS_FS) += autofs/
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obj-$(CONFIG_ADFS_FS) += adfs/
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obj-$(CONFIG_FUSE_FS) += fuse/
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obj-$(CONFIG_OVERLAY_FS) += overlayfs/
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obj-$(CONFIG_ORANGEFS_FS) += orangefs/
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obj-$(CONFIG_UDF_FS) += udf/
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obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs/
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obj-$(CONFIG_OMFS_FS) += omfs/
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obj-$(CONFIG_JFS_FS) += jfs/
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obj-$(CONFIG_XFS_FS) += xfs/
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obj-$(CONFIG_9P_FS) += 9p/
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obj-$(CONFIG_AFS_FS) += afs/
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obj-$(CONFIG_NILFS2_FS) += nilfs2/
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obj-$(CONFIG_BEFS_FS) += befs/
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obj-y += hostfs/
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obj-$(CONFIG_CACHEFILES) += cachefiles/
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obj-$(CONFIG_DEBUG_FS) += debugfs/
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obj-$(CONFIG_TRACING) += tracefs/
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obj-$(CONFIG_OCFS2_FS) += ocfs2/
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obj-$(CONFIG_BTRFS_FS) += btrfs/
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obj-$(CONFIG_GFS2_FS) += gfs2/
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obj-$(CONFIG_F2FS_FS) += f2fs/
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obj-$(CONFIG_BCACHEFS_FS) += bcachefs/
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obj-$(CONFIG_CEPH_FS) += ceph/
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obj-$(CONFIG_PSTORE) += pstore/
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obj-$(CONFIG_EFIVAR_FS) += efivarfs/
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obj-$(CONFIG_EROFS_FS) += erofs/
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obj-$(CONFIG_VBOXSF_FS) += vboxsf/
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obj-$(CONFIG_ZONEFS_FS) += zonefs/
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