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copy: try top copy atime/time/xattrs when copying files

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This commit is contained in:
Lennart Poettering 2014-12-26 17:00:39 +01:00
parent c75f27ea2b
commit e6bd041c97
2 changed files with 104 additions and 1 deletions
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103
src/shared/copy.c
View File

@ -20,6 +20,7 @@
***/
#include <sys/sendfile.h>
#include <sys/xattr.h>
#include "util.h"
#include "btrfs-util.h"
@ -145,6 +146,9 @@ static int fd_copy_regular(int df, const char *from, const struct stat *st, int
if (fchmod(fdt, st->st_mode & 07777) < 0)
r = -errno;
(void) copy_times(fdf, fdt);
(void) copy_xattr(fdf, fdt);
q = close(fdt);
fdt = -1;
@ -244,6 +248,9 @@ static int fd_copy_directory(
if (fchmod(fdt, st->st_mode & 07777) < 0)
r = -errno;
(void) copy_times(fdf, fdt);
(void) copy_xattr(fdf, fdt);
}
FOREACH_DIRENT(de, d, return -errno) {
@ -326,6 +333,7 @@ int copy_directory_fd(int dirfd, const char *to, bool 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);
@ -334,7 +342,12 @@ int copy_file_fd(const char *from, int fdt, bool try_reflink) {
if (fdf < 0)
return -errno;
return copy_bytes(fdf, fdt, (off_t) -1, try_reflink);
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) {
@ -361,3 +374,91 @@ int copy_file(const char *from, const char *to, int flags, mode_t mode) {
return 0;
}
int copy_times(int fdf, int fdt) {
struct timespec ut[2];
struct stat st;
usec_t crtime;
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;
}

2
src/shared/copy.h
View File

@ -30,3 +30,5 @@ 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);
int copy_directory_fd(int dirfd, const char *to, bool merge);
int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink);
int copy_times(int fdf, int fdt);
int copy_xattr(int fdf, int fdt);