+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <sys/sendfile.h>
-#include <sys/xattr.h>
-
-#include "util.h"
-#include "btrfs-util.h"
-#include "copy.h"
-
-#define COPY_BUFFER_SIZE (16*1024)
-
-int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink) {
- bool try_sendfile = true;
- int r;
-
- assert(fdf >= 0);
- assert(fdt >= 0);
-
- /* Try btrfs reflinks first. */
- if (try_reflink && max_bytes == (off_t) -1) {
- r = btrfs_reflink(fdf, fdt);
- if (r >= 0)
- return r;
- }
-
- for (;;) {
- size_t m = COPY_BUFFER_SIZE;
- ssize_t n;
-
- if (max_bytes != (off_t) -1) {
-
- if (max_bytes <= 0)
- return -EFBIG;
-
- if ((off_t) m > max_bytes)
- m = (size_t) max_bytes;
- }
-
- /* First try sendfile(), unless we already tried */
- if (try_sendfile) {
-
- n = sendfile(fdt, fdf, NULL, m);
- if (n < 0) {
- if (errno != EINVAL && errno != ENOSYS)
- return -errno;
-
- try_sendfile = false;
- /* use fallback below */
- } else if (n == 0) /* EOF */
- break;
- else if (n > 0)
- /* Succcess! */
- goto next;
- }
-
- /* As a fallback just copy bits by hand */
- {
- char buf[m];
-
- n = read(fdf, buf, m);
- if (n < 0)
- return -errno;
- if (n == 0) /* EOF */
- break;
-
- r = loop_write(fdt, buf, (size_t) n, false);
- if (r < 0)
- return r;
- }
-
- next:
- if (max_bytes != (off_t) -1) {
- assert(max_bytes >= n);
- max_bytes -= n;
- }
- }
-
- return 0;
-}
-
-static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) {
- _cleanup_free_ char *target = NULL;
- int r;
-
- assert(from);
- assert(st);
- assert(to);
-
- r = readlinkat_malloc(df, from, &target);
- if (r < 0)
- return r;
-
- if (symlinkat(target, dt, to) < 0)
- return -errno;
-
- if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
- return -errno;
-
- return 0;
-}
-
-static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) {
- _cleanup_close_ int fdf = -1, fdt = -1;
- struct timespec ts[2];
- int r, q;
-
- assert(from);
- assert(st);
- assert(to);
-
- fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fdf < 0)
- return -errno;
-
- fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777);
- if (fdt < 0)
- return -errno;
-
- r = copy_bytes(fdf, fdt, (off_t) -1, true);
- if (r < 0) {
- unlinkat(dt, to, 0);
- return r;
- }
-
- if (fchown(fdt, st->st_uid, st->st_gid) < 0)
- r = -errno;
-
- if (fchmod(fdt, st->st_mode & 07777) < 0)
- r = -errno;
-
- ts[0] = st->st_atim;
- ts[1] = st->st_mtim;
- (void) futimens(fdt, ts);
-
- (void) copy_xattr(fdf, fdt);
-
- q = close(fdt);
- fdt = -1;
-
- if (q < 0) {
- r = -errno;
- unlinkat(dt, to, 0);
- }
-
- return r;
-}
-
-static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) {
- int r;
-
- assert(from);
- assert(st);
- assert(to);
-
- r = mkfifoat(dt, to, st->st_mode & 07777);
- if (r < 0)
- return -errno;
-
- if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
- r = -errno;
-
- if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
- r = -errno;
-
- return r;
-}
-
-static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) {
- int r;
-
- assert(from);
- assert(st);
- assert(to);
-
- r = mknodat(dt, to, st->st_mode, st->st_rdev);
- if (r < 0)
- return -errno;
-
- if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
- r = -errno;
-
- if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
- r = -errno;
-
- return r;
-}
-
-static int fd_copy_directory(
- int df,
- const char *from,
- const struct stat *st,
- int dt,
- const char *to,
- dev_t original_device,
- bool merge) {
-
- _cleanup_close_ int fdf = -1, fdt = -1;
- _cleanup_closedir_ DIR *d = NULL;
- struct dirent *de;
- bool created;
- int r;
-
- assert(st);
- assert(to);
-
- if (from)
- fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- else
- fdf = fcntl(df, F_DUPFD_CLOEXEC, 3);
-
- d = fdopendir(fdf);
- if (!d)
- return -errno;
- fdf = -1;
-
- r = mkdirat(dt, to, st->st_mode & 07777);
- if (r >= 0)
- created = true;
- else if (errno == EEXIST && merge)
- created = false;
- else
- return -errno;
-
- fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fdt < 0)
- return -errno;
-
- r = 0;
-
- if (created) {
- struct timespec ut[2] = {
- st->st_atim,
- st->st_mtim
- };
-
- if (fchown(fdt, st->st_uid, st->st_gid) < 0)
- r = -errno;
-
- if (fchmod(fdt, st->st_mode & 07777) < 0)
- r = -errno;
-
- (void) futimens(fdt, ut);
- (void) copy_xattr(dirfd(d), fdt);
- }
-
- FOREACH_DIRENT(de, d, return -errno) {
- struct stat buf;
- int q;
-
- if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) {
- r = -errno;
- continue;
- }
-
- if (buf.st_dev != original_device)
- continue;
-
- if (S_ISREG(buf.st_mode))
- q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
- else if (S_ISDIR(buf.st_mode))
- q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge);
- else if (S_ISLNK(buf.st_mode))
- q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name);
- else if (S_ISFIFO(buf.st_mode))
- q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name);
- else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode))
- q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name);
- else
- q = -EOPNOTSUPP;
-
- if (q == -EEXIST && merge)
- q = 0;
-
- if (q < 0)
- r = q;
- }
-
- return r;
-}
-
-int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) {
- struct stat st;
-
- assert(from);
- assert(to);
-
- if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0)
- return -errno;
-
- if (S_ISREG(st.st_mode))
- return fd_copy_regular(fdf, from, &st, fdt, to);
- else if (S_ISDIR(st.st_mode))
- return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge);
- else if (S_ISLNK(st.st_mode))
- return fd_copy_symlink(fdf, from, &st, fdt, to);
- else if (S_ISFIFO(st.st_mode))
- return fd_copy_fifo(fdf, from, &st, fdt, to);
- else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode))
- return fd_copy_node(fdf, from, &st, fdt, to);
- else
- return -EOPNOTSUPP;
-}
-
-int copy_tree(const char *from, const char *to, bool merge) {
- return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge);
-}
-
-int copy_directory_fd(int dirfd, const char *to, bool merge) {
-
- struct stat st;
-
- assert(dirfd >= 0);
- assert(to);
-
- if (fstat(dirfd, &st) < 0)
- return -errno;
-
- if (!S_ISDIR(st.st_mode))
- return -ENOTDIR;
-
- return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge);
-}
-
-int copy_file_fd(const char *from, int fdt, bool try_reflink) {
- _cleanup_close_ int fdf = -1;
- int r;
-
- assert(from);
- assert(fdt >= 0);
-
- fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fdf < 0)
- return -errno;
-
- r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
-
- (void) copy_times(fdf, fdt);
- (void) copy_xattr(fdf, fdt);
-
- return r;
-}
-
-int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) {
- int fdt = -1, r;
-
- assert(from);
- assert(to);
-
- RUN_WITH_UMASK(0000) {
- fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
- if (fdt < 0)
- return -errno;
- }
-
- if (chattr_flags != 0)
- (void) chattr_fd(fdt, chattr_flags, (unsigned) -1);
-
- r = copy_file_fd(from, fdt, true);
- if (r < 0) {
- close(fdt);
- unlink(to);
- return r;
- }
-
- if (close(fdt) < 0) {
- unlink_noerrno(to);
- return -errno;
- }
-
- return 0;
-}
-
-int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) {
- _cleanup_free_ char *t = NULL;
- int r;
-
- assert(from);
- assert(to);
-
- r = tempfn_random(to, NULL, &t);
- if (r < 0)
- return r;
-
- r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags);
- if (r < 0)
- return r;
-
- if (replace) {
- r = renameat(AT_FDCWD, t, AT_FDCWD, to);
- if (r < 0)
- r = -errno;
- } else
- r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to);
- if (r < 0) {
- (void) unlink_noerrno(t);
- return r;
- }
-
- return 0;
-}
-
-int copy_times(int fdf, int fdt) {
- struct timespec ut[2];
- struct stat st;
- usec_t crtime = 0;
-
- assert(fdf >= 0);
- assert(fdt >= 0);
-
- if (fstat(fdf, &st) < 0)
- return -errno;
-
- ut[0] = st.st_atim;
- ut[1] = st.st_mtim;
-
- if (futimens(fdt, ut) < 0)
- return -errno;
-
- if (fd_getcrtime(fdf, &crtime) >= 0)
- (void) fd_setcrtime(fdt, crtime);
-
- return 0;
-}
-
-int copy_xattr(int fdf, int fdt) {
- _cleanup_free_ char *bufa = NULL, *bufb = NULL;
- size_t sza = 100, szb = 100;
- ssize_t n;
- int ret = 0;
- const char *p;
-
- for (;;) {
- bufa = malloc(sza);
- if (!bufa)
- return -ENOMEM;
-
- n = flistxattr(fdf, bufa, sza);
- if (n == 0)
- return 0;
- if (n > 0)
- break;
- if (errno != ERANGE)
- return -errno;
-
- sza *= 2;
-
- free(bufa);
- bufa = NULL;
- }
-
- p = bufa;
- while (n > 0) {
- size_t l;
-
- l = strlen(p);
- assert(l < (size_t) n);
-
- if (startswith(p, "user.")) {
- ssize_t m;
-
- if (!bufb) {
- bufb = malloc(szb);
- if (!bufb)
- return -ENOMEM;
- }
-
- m = fgetxattr(fdf, p, bufb, szb);
- if (m < 0) {
- if (errno == ERANGE) {
- szb *= 2;
- free(bufb);
- bufb = NULL;
- continue;
- }
-
- return -errno;
- }
-
- if (fsetxattr(fdt, p, bufb, m, 0) < 0)
- ret = -errno;
- }
-
- p += l + 1;
- n -= l + 1;
- }
-
- return ret;
-}
~ianmdlvl / elogind.git / blobdiff