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-rw-r--r--src/basic/copy.c196
1 files changed, 146 insertions, 50 deletions
diff --git a/src/basic/copy.c b/src/basic/copy.c
index 230e7e4d3f..9883f5fa31 100644
--- a/src/basic/copy.c
+++ b/src/basic/copy.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -19,64 +17,140 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <sys/sendfile.h>
+#include <sys/stat.h>
#include <sys/xattr.h>
+#include <time.h>
+#include <unistd.h>
-#include "util.h"
+#include "alloc-util.h"
#include "btrfs-util.h"
+#include "chattr-util.h"
#include "copy.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "macro.h"
+#include "missing.h"
+#include "string-util.h"
+#include "strv.h"
+#include "time-util.h"
+#include "umask-util.h"
+#include "xattr-util.h"
+
+#define COPY_BUFFER_SIZE (16*1024u)
+
+static ssize_t try_copy_file_range(int fd_in, loff_t *off_in,
+ int fd_out, loff_t *off_out,
+ size_t len,
+ unsigned int flags) {
+ static int have = -1;
+ ssize_t r;
+
+ if (have == false)
+ return -ENOSYS;
+
+ r = copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
+ if (_unlikely_(have < 0))
+ have = r >= 0 || errno != ENOSYS;
+ if (r >= 0)
+ return r;
+ else
+ return -errno;
+}
-#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 copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink) {
+ bool try_cfr = true, try_sendfile = true, try_splice = true;
int r;
+ size_t m = SSIZE_MAX; /* that is the maximum that sendfile and c_f_r accept */
assert(fdf >= 0);
assert(fdt >= 0);
/* Try btrfs reflinks first. */
- if (try_reflink && max_bytes == (off_t) -1) {
+ if (try_reflink &&
+ max_bytes == (uint64_t) -1 &&
+ lseek(fdf, 0, SEEK_CUR) == 0 &&
+ lseek(fdt, 0, SEEK_CUR) == 0) {
+
r = btrfs_reflink(fdf, fdt);
if (r >= 0)
- return r;
+ return 0; /* we copied the whole thing, hence hit EOF, return 0 */
}
for (;;) {
- size_t m = COPY_BUFFER_SIZE;
ssize_t n;
- if (max_bytes != (off_t) -1) {
-
+ if (max_bytes != (uint64_t) -1) {
if (max_bytes <= 0)
- return -EFBIG;
+ return 1; /* return > 0 if we hit the max_bytes limit */
+
+ if (m > max_bytes)
+ m = max_bytes;
+ }
+
+ /* First try copy_file_range(), unless we already tried */
+ if (try_cfr) {
+ n = try_copy_file_range(fdf, NULL, fdt, NULL, m, 0u);
+ if (n < 0) {
+ if (!IN_SET(n, -EINVAL, -ENOSYS, -EXDEV, -EBADF))
+ return n;
- if ((off_t) m > max_bytes)
- m = (size_t) max_bytes;
+ try_cfr = false;
+ /* use fallback below */
+ } else if (n == 0) /* EOF */
+ break;
+ else
+ /* Success! */
+ goto next;
}
/* First try sendfile(), unless we already tried */
if (try_sendfile) {
-
n = sendfile(fdt, fdf, NULL, m);
if (n < 0) {
- if (errno != EINVAL && errno != ENOSYS)
+ if (!IN_SET(errno, EINVAL, ENOSYS))
return -errno;
try_sendfile = false;
/* use fallback below */
} else if (n == 0) /* EOF */
break;
- else if (n > 0)
- /* Succcess! */
+ else
+ /* Success! */
+ goto next;
+ }
+
+ /* Then try splice, unless we already tried */
+ if (try_splice) {
+ n = splice(fdf, NULL, fdt, NULL, m, 0);
+ if (n < 0) {
+ if (!IN_SET(errno, EINVAL, ENOSYS))
+ return -errno;
+
+ try_splice = false;
+ /* use fallback below */
+ } else if (n == 0) /* EOF */
+ break;
+ else
+ /* Success! */
goto next;
}
/* As a fallback just copy bits by hand */
{
- char buf[m];
+ uint8_t buf[MIN(m, COPY_BUFFER_SIZE)];
- n = read(fdf, buf, m);
+ n = read(fdf, buf, sizeof buf);
if (n < 0)
return -errno;
if (n == 0) /* EOF */
@@ -88,13 +162,18 @@ int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink) {
}
next:
- if (max_bytes != (off_t) -1) {
- assert(max_bytes >= n);
+ if (max_bytes != (uint64_t) -1) {
+ assert(max_bytes >= (uint64_t) n);
max_bytes -= n;
}
+ /* sendfile accepts at most SSIZE_MAX-offset bytes to copy,
+ * so reduce our maximum by the amount we already copied,
+ * but don't go below our copy buffer size, unless we are
+ * close the limit of bytes we are allowed to copy. */
+ m = MAX(MIN(COPY_BUFFER_SIZE, max_bytes), m - n);
}
- return 0;
+ return 0; /* return 0 if we hit EOF earlier than the size limit */
}
static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) {
@@ -135,7 +214,7 @@ static int fd_copy_regular(int df, const char *from, const struct stat *st, int
if (fdt < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1, true);
+ r = copy_bytes(fdf, fdt, (uint64_t) -1, true);
if (r < 0) {
unlinkat(dt, to, 0);
return r;
@@ -226,6 +305,8 @@ static int fd_copy_directory(
fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
else
fdf = fcntl(df, F_DUPFD_CLOEXEC, 3);
+ if (fdf < 0)
+ return -errno;
d = fdopendir(fdf);
if (!d)
@@ -246,26 +327,13 @@ static int fd_copy_directory(
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) {
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
struct stat buf;
int q;
+ if (STR_IN_SET(de->d_name, ".", ".."))
+ continue;
+
if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) {
r = -errno;
continue;
@@ -282,7 +350,7 @@ static int fd_copy_directory(
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))
+ else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode) || S_ISSOCK(buf.st_mode))
q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name);
else
q = -EOPNOTSUPP;
@@ -294,6 +362,22 @@ static int fd_copy_directory(
r = q;
}
+ 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) copy_xattr(dirfd(d), fdt);
+ (void) futimens(fdt, ut);
+ }
+
return r;
}
@@ -314,7 +398,7 @@ int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge)
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))
+ else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) || S_ISSOCK(st.st_mode))
return fd_copy_node(fdf, from, &st, fdt, to);
else
return -EOPNOTSUPP;
@@ -325,7 +409,6 @@ int copy_tree(const char *from, const char *to, bool merge) {
}
int copy_directory_fd(int dirfd, const char *to, bool merge) {
-
struct stat st;
assert(dirfd >= 0);
@@ -340,6 +423,21 @@ int copy_directory_fd(int dirfd, const char *to, bool merge) {
return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge);
}
+int copy_directory(const char *from, const char *to, bool merge) {
+ struct stat st;
+
+ assert(from);
+ assert(to);
+
+ if (lstat(from, &st) < 0)
+ return -errno;
+
+ if (!S_ISDIR(st.st_mode))
+ return -ENOTDIR;
+
+ return fd_copy_directory(AT_FDCWD, from, &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;
@@ -351,7 +449,7 @@ int copy_file_fd(const char *from, int fdt, bool try_reflink) {
if (fdf < 0)
return -errno;
- r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
+ r = copy_bytes(fdf, fdt, (uint64_t) -1, try_reflink);
(void) copy_times(fdf, fdt);
(void) copy_xattr(fdf, fdt);
@@ -463,8 +561,7 @@ int copy_xattr(int fdf, int fdt) {
sza *= 2;
- free(bufa);
- bufa = NULL;
+ bufa = mfree(bufa);
}
p = bufa;
@@ -487,8 +584,7 @@ int copy_xattr(int fdf, int fdt) {
if (m < 0) {
if (errno == ERANGE) {
szb *= 2;
- free(bufb);
- bufb = NULL;
+ bufb = mfree(bufb);
continue;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-22 22:32:54 +0000