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authorDenys Vlasenko2018-07-13 20:30:02 +0200
committerDenys Vlasenko2018-07-13 20:30:02 +0200
commit79fb6ac7a5acc4178b66314c573aeada1d387ed9 (patch)
tree421fd899e9dfcc5533b3107af6eba3de0f153044 /libbb
parent253f555f01fa380083a7436a569397a4e7f997b0 (diff)
downloadbusybox-79fb6ac7a5acc4178b66314c573aeada1d387ed9.zip
busybox-79fb6ac7a5acc4178b66314c573aeada1d387ed9.tar.gz
cp: optional --reflink support
function old new delta cp_main 428 512 +84 copy_file 1676 1742 +66 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb')
-rw-r--r--libbb/copy_file.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/libbb/copy_file.c b/libbb/copy_file.c
index 1b8befd..98bd4fe 100644
--- a/libbb/copy_file.c
+++ b/libbb/copy_file.c
@@ -340,8 +340,27 @@ int FAST_FUNC copy_file(const char *source, const char *dest, int flags)
}
}
#endif
+#if ENABLE_FEATURE_CP_REFLINK
+# undef BTRFS_IOCTL_MAGIC
+# define BTRFS_IOCTL_MAGIC 0x94
+# undef BTRFS_IOC_CLONE
+# define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
+ if (flags & FILEUTILS_REFLINK) {
+ retval = ioctl(dst_fd, BTRFS_IOC_CLONE, src_fd);
+ if (retval == 0)
+ goto do_close;
+ /* reflink did not work */
+ if (flags & FILEUTILS_REFLINK_ALWAYS) {
+ bb_perror_msg("failed to clone '%s' from '%s'", dest, source);
+ goto do_close;
+ }
+ /* fall through to standard copy */
+ retval = 0;
+ }
+#endif
if (bb_copyfd_eof(src_fd, dst_fd) == -1)
retval = -1;
+ IF_FEATURE_CP_REFLINK(do_close:)
/* Careful with writing... */
if (close(dst_fd) < 0) {
bb_perror_msg("error writing to '%s'", dest);