along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sys/sendfile.h>
+
#include "util.h"
+#include "btrfs-util.h"
#include "copy.h"
-int copy_bytes(int fdf, int fdt) {
+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 (;;) {
- char buf[PIPE_BUF];
- ssize_t n, k;
-
- n = read(fdf, buf, sizeof(buf));
- if (n < 0)
- return -errno;
- if (n == 0)
- break;
-
- errno = 0;
- k = loop_write(fdt, buf, n, false);
- if (k < 0)
- return k;
- if (k != n)
- return errno ? -errno : -EIO;
+ size_t m = PIPE_BUF;
+ 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;
if (r < 0)
return r;
- if (symlinkat(target, dt, to) < 0) {
- if (errno == EEXIST)
- return 0;
-
+ 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 -errno;
fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777);
- if (fdt < 0) {
- if (errno == EEXIST)
- return 0;
-
+ if (fdt < 0)
return -errno;
- }
- r = copy_bytes(fdf, fdt);
+ r = copy_bytes(fdf, fdt, (off_t) -1, true);
if (r < 0) {
unlinkat(dt, to, 0);
return r;
assert(to);
r = mkfifoat(dt, to, st->st_mode & 07777);
- if (r < 0) {
- if (errno == EEXIST)
- return 0;
-
+ if (r < 0)
return -errno;
- }
if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
r = -errno;
assert(to);
r = mknodat(dt, to, st->st_mode, st->st_rdev);
- if (r < 0) {
- if (errno == EEXIST)
- return 0;
-
+ if (r < 0)
return -errno;
- }
if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 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) {
+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 = mkdirat(dt, to, st->st_mode & 07777);
if (r >= 0)
created = true;
- else if (errno == EEXIST)
+ else if (errno == EEXIST && merge)
created = false;
else
return -errno;
if (fdt < 0)
return -errno;
+ r = 0;
+
if (created) {
if (fchown(fdt, st->st_uid, st->st_gid) < 0)
r = -errno;
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);
+ 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))
else
q = -ENOTSUP;
+ if (q == -EEXIST && merge)
+ q = 0;
+
if (q < 0)
r = q;
}
return r;
}
-int copy_tree(const char *from, const char *to) {
+int copy_tree(const char *from, const char *to, bool merge) {
struct stat st;
assert(from);
if (S_ISREG(st.st_mode))
return fd_copy_regular(AT_FDCWD, from, &st, AT_FDCWD, to);
else if (S_ISDIR(st.st_mode))
- return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev);
+ return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev, merge);
else if (S_ISLNK(st.st_mode))
return fd_copy_symlink(AT_FDCWD, from, &st, AT_FDCWD, to);
else if (S_ISFIFO(st.st_mode))
return -ENOTSUP;
}
-int copy_file(const char *from, const char *to, int flags, mode_t mode) {
- _cleanup_close_ int fdf = -1, fdt = -1;
- int r;
+int copy_tree_fd(int dirfd, const char *to, bool merge) {
- assert(from);
+ 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;
+
+ assert(from);
+ assert(fdt >= 0);
+
fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fdf < 0)
return -errno;
+ return copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
+}
+
+int copy_file(const char *from, const char *to, int flags, mode_t mode) {
+ int fdt, r;
+
+ assert(from);
+ assert(to);
+
fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
if (fdt < 0)
return -errno;
- r = copy_bytes(fdf, fdt);
+ r = copy_file_fd(from, fdt, true);
if (r < 0) {
+ close(fdt);
unlink(to);
return r;
}
- r = close(fdt);
- fdt = -1;
-
- if (r < 0) {
- r = -errno;
- unlink(to);
- return r;
+ if (close(fdt) < 0) {
+ unlink_noerrno(to);
+ return -errno;
}
return 0;
~ianmdlvl / elogind.git / blobdiff