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"
-int copy_bytes(int fdf, int fdt, off_t max_bytes) {
+#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);
- for (;;) {
- char buf[PIPE_BUF];
- ssize_t n, k;
- size_t m;
+ /* Try btrfs reflinks first. */
+ if (try_reflink && max_bytes == (off_t) -1) {
+ r = btrfs_reflink(fdf, fdt);
+ if (r >= 0)
+ return r;
+ }
- m = sizeof(buf);
+ for (;;) {
+ size_t m = COPY_BUFFER_SIZE;
+ ssize_t n;
if (max_bytes != (off_t) -1) {
if (max_bytes <= 0)
- return -E2BIG;
+ return -EFBIG;
if ((off_t) m > max_bytes)
m = (size_t) max_bytes;
}
- n = read(fdf, buf, m);
- if (n < 0)
- return -errno;
- if (n == 0)
- break;
+ /* 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;
+ }
- errno = 0;
- k = loop_write(fdt, buf, n, false);
- if (k < 0)
- return k;
- if (k != n)
- return errno ? -errno : -EIO;
+ /* 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;
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);
if (fdt < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1);
+ r = copy_bytes(fdf, fdt, (off_t) -1, true);
if (r < 0) {
unlinkat(dt, to, 0);
return r;
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;
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) {
+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(from);
assert(st);
assert(to);
- fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fdf < 0)
- return -errno;
+ 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)
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) {
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 = -ENOTSUP;
+ q = -EOPNOTSUPP;
if (q == -EEXIST && merge)
q = 0;
return r;
}
-int copy_tree(const char *from, const char *to, bool merge) {
+int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) {
struct stat st;
assert(from);
assert(to);
- if (lstat(from, &st) < 0)
+ if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0)
return -errno;
if (S_ISREG(st.st_mode))
- return fd_copy_regular(AT_FDCWD, from, &st, AT_FDCWD, to);
+ return fd_copy_regular(fdf, from, &st, fdt, to);
else if (S_ISDIR(st.st_mode))
- return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev, merge);
+ return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge);
else if (S_ISLNK(st.st_mode))
- return fd_copy_symlink(AT_FDCWD, from, &st, AT_FDCWD, to);
+ return fd_copy_symlink(fdf, from, &st, fdt, to);
else if (S_ISFIFO(st.st_mode))
- return fd_copy_fifo(AT_FDCWD, from, &st, AT_FDCWD, to);
+ 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(AT_FDCWD, from, &st, AT_FDCWD, to);
+ return fd_copy_node(fdf, from, &st, fdt, to);
else
- return -ENOTSUP;
+ return -EOPNOTSUPP;
}
-int copy_file(const char *from, const char *to, int flags, mode_t mode) {
- _cleanup_close_ int fdf = -1, fdt = -1;
+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(to);
+ assert(fdt >= 0);
fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fdf < 0)
return -errno;
- fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
- if (fdt < 0)
- return -errno;
+ r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
- r = copy_bytes(fdf, fdt, (off_t) -1);
+ (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, true, chattr_flags);
+
+ r = copy_file_fd(from, fdt, true);
if (r < 0) {
+ close(fdt);
unlink(to);
return r;
}
- r = close(fdt);
- fdt = -1;
+ 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, &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) {
- r = -errno;
- unlink(to);
+ (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