mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Zach Brown](/assets/img/avatar_default.png)
Add a copy_file_range() system call for offloading copies between regular files. This gives an interface to underlying layers of the storage stack which can copy without reading and writing all the data. There are a few candidates that should support copy offloading in the nearer term: - btrfs shares extent references with its clone ioctl - NFS has patches to add a COPY command which copies on the server - SCSI has a family of XCOPY commands which copy in the device This system call avoids the complexity of also accelerating the creation of the destination file by operating on an existing destination file descriptor, not a path. Currently the high level vfs entry point limits copy offloading to files on the same mount and super (and not in the same file). This can be relaxed if we get implementations which can copy between file systems safely. Signed-off-by: Zach Brown <zab@redhat.com> [Anna Schumaker: Change -EINVAL to -EBADF during file verification, Change flags parameter from int to unsigned int, Add function to include/linux/syscalls.h, Check copy len after file open mode, Don't forbid ranges inside the same file, Use rw_verify_area() to veriy ranges, Use file_out rather than file_in, Add COPY_FR_REFLINK flag] Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
252 lines
7 KiB
C
252 lines
7 KiB
C
|
|
#include <linux/linkage.h>
|
|
#include <linux/errno.h>
|
|
|
|
#include <asm/unistd.h>
|
|
|
|
/* we can't #include <linux/syscalls.h> here,
|
|
but tell gcc to not warn with -Wmissing-prototypes */
|
|
asmlinkage long sys_ni_syscall(void);
|
|
|
|
/*
|
|
* Non-implemented system calls get redirected here.
|
|
*/
|
|
asmlinkage long sys_ni_syscall(void)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
cond_syscall(sys_quotactl);
|
|
cond_syscall(sys32_quotactl);
|
|
cond_syscall(sys_acct);
|
|
cond_syscall(sys_lookup_dcookie);
|
|
cond_syscall(compat_sys_lookup_dcookie);
|
|
cond_syscall(sys_swapon);
|
|
cond_syscall(sys_swapoff);
|
|
cond_syscall(sys_kexec_load);
|
|
cond_syscall(compat_sys_kexec_load);
|
|
cond_syscall(sys_kexec_file_load);
|
|
cond_syscall(sys_init_module);
|
|
cond_syscall(sys_finit_module);
|
|
cond_syscall(sys_delete_module);
|
|
cond_syscall(sys_socketpair);
|
|
cond_syscall(sys_bind);
|
|
cond_syscall(sys_listen);
|
|
cond_syscall(sys_accept);
|
|
cond_syscall(sys_accept4);
|
|
cond_syscall(sys_connect);
|
|
cond_syscall(sys_getsockname);
|
|
cond_syscall(sys_getpeername);
|
|
cond_syscall(sys_sendto);
|
|
cond_syscall(sys_send);
|
|
cond_syscall(sys_recvfrom);
|
|
cond_syscall(sys_recv);
|
|
cond_syscall(sys_socket);
|
|
cond_syscall(sys_setsockopt);
|
|
cond_syscall(compat_sys_setsockopt);
|
|
cond_syscall(sys_getsockopt);
|
|
cond_syscall(compat_sys_getsockopt);
|
|
cond_syscall(sys_shutdown);
|
|
cond_syscall(sys_sendmsg);
|
|
cond_syscall(sys_sendmmsg);
|
|
cond_syscall(compat_sys_sendmsg);
|
|
cond_syscall(compat_sys_sendmmsg);
|
|
cond_syscall(sys_recvmsg);
|
|
cond_syscall(sys_recvmmsg);
|
|
cond_syscall(compat_sys_recvmsg);
|
|
cond_syscall(compat_sys_recv);
|
|
cond_syscall(compat_sys_recvfrom);
|
|
cond_syscall(compat_sys_recvmmsg);
|
|
cond_syscall(sys_socketcall);
|
|
cond_syscall(sys_futex);
|
|
cond_syscall(compat_sys_futex);
|
|
cond_syscall(sys_set_robust_list);
|
|
cond_syscall(compat_sys_set_robust_list);
|
|
cond_syscall(sys_get_robust_list);
|
|
cond_syscall(compat_sys_get_robust_list);
|
|
cond_syscall(sys_epoll_create);
|
|
cond_syscall(sys_epoll_create1);
|
|
cond_syscall(sys_epoll_ctl);
|
|
cond_syscall(sys_epoll_wait);
|
|
cond_syscall(sys_epoll_pwait);
|
|
cond_syscall(compat_sys_epoll_pwait);
|
|
cond_syscall(sys_semget);
|
|
cond_syscall(sys_semop);
|
|
cond_syscall(sys_semtimedop);
|
|
cond_syscall(compat_sys_semtimedop);
|
|
cond_syscall(sys_semctl);
|
|
cond_syscall(compat_sys_semctl);
|
|
cond_syscall(sys_msgget);
|
|
cond_syscall(sys_msgsnd);
|
|
cond_syscall(compat_sys_msgsnd);
|
|
cond_syscall(sys_msgrcv);
|
|
cond_syscall(compat_sys_msgrcv);
|
|
cond_syscall(sys_msgctl);
|
|
cond_syscall(compat_sys_msgctl);
|
|
cond_syscall(sys_shmget);
|
|
cond_syscall(sys_shmat);
|
|
cond_syscall(compat_sys_shmat);
|
|
cond_syscall(sys_shmdt);
|
|
cond_syscall(sys_shmctl);
|
|
cond_syscall(compat_sys_shmctl);
|
|
cond_syscall(sys_mq_open);
|
|
cond_syscall(sys_mq_unlink);
|
|
cond_syscall(sys_mq_timedsend);
|
|
cond_syscall(sys_mq_timedreceive);
|
|
cond_syscall(sys_mq_notify);
|
|
cond_syscall(sys_mq_getsetattr);
|
|
cond_syscall(compat_sys_mq_open);
|
|
cond_syscall(compat_sys_mq_timedsend);
|
|
cond_syscall(compat_sys_mq_timedreceive);
|
|
cond_syscall(compat_sys_mq_notify);
|
|
cond_syscall(compat_sys_mq_getsetattr);
|
|
cond_syscall(sys_mbind);
|
|
cond_syscall(sys_get_mempolicy);
|
|
cond_syscall(sys_set_mempolicy);
|
|
cond_syscall(compat_sys_mbind);
|
|
cond_syscall(compat_sys_get_mempolicy);
|
|
cond_syscall(compat_sys_set_mempolicy);
|
|
cond_syscall(sys_add_key);
|
|
cond_syscall(sys_request_key);
|
|
cond_syscall(sys_keyctl);
|
|
cond_syscall(compat_sys_keyctl);
|
|
cond_syscall(compat_sys_socketcall);
|
|
cond_syscall(sys_inotify_init);
|
|
cond_syscall(sys_inotify_init1);
|
|
cond_syscall(sys_inotify_add_watch);
|
|
cond_syscall(sys_inotify_rm_watch);
|
|
cond_syscall(sys_migrate_pages);
|
|
cond_syscall(sys_move_pages);
|
|
cond_syscall(sys_chown16);
|
|
cond_syscall(sys_fchown16);
|
|
cond_syscall(sys_getegid16);
|
|
cond_syscall(sys_geteuid16);
|
|
cond_syscall(sys_getgid16);
|
|
cond_syscall(sys_getgroups16);
|
|
cond_syscall(sys_getresgid16);
|
|
cond_syscall(sys_getresuid16);
|
|
cond_syscall(sys_getuid16);
|
|
cond_syscall(sys_lchown16);
|
|
cond_syscall(sys_setfsgid16);
|
|
cond_syscall(sys_setfsuid16);
|
|
cond_syscall(sys_setgid16);
|
|
cond_syscall(sys_setgroups16);
|
|
cond_syscall(sys_setregid16);
|
|
cond_syscall(sys_setresgid16);
|
|
cond_syscall(sys_setresuid16);
|
|
cond_syscall(sys_setreuid16);
|
|
cond_syscall(sys_setuid16);
|
|
cond_syscall(sys_sgetmask);
|
|
cond_syscall(sys_ssetmask);
|
|
cond_syscall(sys_vm86old);
|
|
cond_syscall(sys_vm86);
|
|
cond_syscall(sys_modify_ldt);
|
|
cond_syscall(sys_ipc);
|
|
cond_syscall(compat_sys_ipc);
|
|
cond_syscall(compat_sys_sysctl);
|
|
cond_syscall(sys_flock);
|
|
cond_syscall(sys_io_setup);
|
|
cond_syscall(sys_io_destroy);
|
|
cond_syscall(sys_io_submit);
|
|
cond_syscall(sys_io_cancel);
|
|
cond_syscall(sys_io_getevents);
|
|
cond_syscall(sys_sysfs);
|
|
cond_syscall(sys_syslog);
|
|
cond_syscall(sys_process_vm_readv);
|
|
cond_syscall(sys_process_vm_writev);
|
|
cond_syscall(compat_sys_process_vm_readv);
|
|
cond_syscall(compat_sys_process_vm_writev);
|
|
cond_syscall(sys_uselib);
|
|
cond_syscall(sys_fadvise64);
|
|
cond_syscall(sys_fadvise64_64);
|
|
cond_syscall(sys_madvise);
|
|
cond_syscall(sys_setuid);
|
|
cond_syscall(sys_setregid);
|
|
cond_syscall(sys_setgid);
|
|
cond_syscall(sys_setreuid);
|
|
cond_syscall(sys_setresuid);
|
|
cond_syscall(sys_getresuid);
|
|
cond_syscall(sys_setresgid);
|
|
cond_syscall(sys_getresgid);
|
|
cond_syscall(sys_setgroups);
|
|
cond_syscall(sys_getgroups);
|
|
cond_syscall(sys_setfsuid);
|
|
cond_syscall(sys_setfsgid);
|
|
cond_syscall(sys_capget);
|
|
cond_syscall(sys_capset);
|
|
cond_syscall(sys_copy_file_range);
|
|
|
|
/* arch-specific weak syscall entries */
|
|
cond_syscall(sys_pciconfig_read);
|
|
cond_syscall(sys_pciconfig_write);
|
|
cond_syscall(sys_pciconfig_iobase);
|
|
cond_syscall(compat_sys_s390_ipc);
|
|
cond_syscall(ppc_rtas);
|
|
cond_syscall(sys_spu_run);
|
|
cond_syscall(sys_spu_create);
|
|
cond_syscall(sys_subpage_prot);
|
|
cond_syscall(sys_s390_pci_mmio_read);
|
|
cond_syscall(sys_s390_pci_mmio_write);
|
|
|
|
/* mmu depending weak syscall entries */
|
|
cond_syscall(sys_mprotect);
|
|
cond_syscall(sys_msync);
|
|
cond_syscall(sys_mlock);
|
|
cond_syscall(sys_munlock);
|
|
cond_syscall(sys_mlockall);
|
|
cond_syscall(sys_munlockall);
|
|
cond_syscall(sys_mlock2);
|
|
cond_syscall(sys_mincore);
|
|
cond_syscall(sys_madvise);
|
|
cond_syscall(sys_mremap);
|
|
cond_syscall(sys_remap_file_pages);
|
|
cond_syscall(compat_sys_move_pages);
|
|
cond_syscall(compat_sys_migrate_pages);
|
|
|
|
/* block-layer dependent */
|
|
cond_syscall(sys_bdflush);
|
|
cond_syscall(sys_ioprio_set);
|
|
cond_syscall(sys_ioprio_get);
|
|
|
|
/* New file descriptors */
|
|
cond_syscall(sys_signalfd);
|
|
cond_syscall(sys_signalfd4);
|
|
cond_syscall(compat_sys_signalfd);
|
|
cond_syscall(compat_sys_signalfd4);
|
|
cond_syscall(sys_timerfd_create);
|
|
cond_syscall(sys_timerfd_settime);
|
|
cond_syscall(sys_timerfd_gettime);
|
|
cond_syscall(compat_sys_timerfd_settime);
|
|
cond_syscall(compat_sys_timerfd_gettime);
|
|
cond_syscall(sys_eventfd);
|
|
cond_syscall(sys_eventfd2);
|
|
cond_syscall(sys_memfd_create);
|
|
cond_syscall(sys_userfaultfd);
|
|
|
|
/* performance counters: */
|
|
cond_syscall(sys_perf_event_open);
|
|
|
|
/* fanotify! */
|
|
cond_syscall(sys_fanotify_init);
|
|
cond_syscall(sys_fanotify_mark);
|
|
cond_syscall(compat_sys_fanotify_mark);
|
|
|
|
/* open by handle */
|
|
cond_syscall(sys_name_to_handle_at);
|
|
cond_syscall(sys_open_by_handle_at);
|
|
cond_syscall(compat_sys_open_by_handle_at);
|
|
|
|
/* compare kernel pointers */
|
|
cond_syscall(sys_kcmp);
|
|
|
|
/* operate on Secure Computing state */
|
|
cond_syscall(sys_seccomp);
|
|
|
|
/* access BPF programs and maps */
|
|
cond_syscall(sys_bpf);
|
|
|
|
/* execveat */
|
|
cond_syscall(sys_execveat);
|
|
|
|
/* membarrier */
|
|
cond_syscall(sys_membarrier);
|