114 lines
3.5 KiB
Diff
114 lines
3.5 KiB
Diff
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From 85854b245e1090970d566d6432dabc315e17461c Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Sat, 30 Jun 2012 09:06:13 +0200
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Subject: [PATCH] dracut-install.c: try clone ioctl for more speed
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---
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install/dracut-install.c | 64 ++++++++++++++++++++++++++++++++++++++++++----
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1 file changed, 59 insertions(+), 5 deletions(-)
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diff --git a/install/dracut-install.c b/install/dracut-install.c
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index ccd4ba4..86c32db 100644
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--- a/install/dracut-install.c
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+++ b/install/dracut-install.c
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@@ -39,6 +39,7 @@
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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+#include <sys/ioctl.h>
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#include "log.h"
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#include "hashmap.h"
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@@ -163,25 +164,78 @@ static int ln_r(const char *src, const char *dst)
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return 0;
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}
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+/* Perform the O(1) btrfs clone operation, if possible.
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+ Upon success, return 0. Otherwise, return -1 and set errno. */
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+static inline int clone_file(int dest_fd, int src_fd)
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+{
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+#undef BTRFS_IOCTL_MAGIC
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+#define BTRFS_IOCTL_MAGIC 0x94
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+#undef BTRFS_IOC_CLONE
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+#define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
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+ return ioctl(dest_fd, BTRFS_IOC_CLONE, src_fd);
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+}
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+
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+static bool use_clone = true;
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+
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static int cp(const char *src, const char *dst)
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{
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int pid;
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- int status;
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+ int ret;
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+
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+ if(use_clone) {
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+ struct stat sb;
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+ int dest_desc, source_desc;
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+
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+ if (lstat(src, &sb) != 0)
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+ goto normal_copy;
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+
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+ if (S_ISLNK(sb.st_mode))
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+ goto normal_copy;
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+
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+ source_desc = open(src, O_RDONLY | O_CLOEXEC);
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+ if (source_desc < 0)
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+ goto normal_copy;
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+ dest_desc =
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+ open(dst, O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC,
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+ (sb.st_mode) & (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO));
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+
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+ if (dest_desc < 0) {
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+ close(source_desc);
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+ goto normal_copy;
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+ }
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+
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+ ret = clone_file(dest_desc, source_desc);
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+ close(source_desc);
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+ if (ret == 0) {
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+ if (fchown(dest_desc, sb.st_uid, sb.st_gid) != 0)
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+ fchown(dest_desc, -1, sb.st_gid);
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+ close(dest_desc);
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+ return ret;
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+ }
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+ close(dest_desc);
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+
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+ /* clone did not work, remove the file */
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+ unlink(dst);
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+ /* do not try clone again */
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+ use_clone = false;
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+ }
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+
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+ normal_copy:
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pid = fork();
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if (pid == 0) {
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execlp("cp", "cp", "--reflink=auto", "--sparse=auto", "--preserve=mode", "-fL", src, dst, NULL);
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_exit(EXIT_FAILURE);
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}
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- while (waitpid(pid, &status, 0) < 0) {
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+ while (waitpid(pid, &ret, 0) < 0) {
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if (errno != EINTR) {
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- status = -1;
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+ ret = -1;
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break;
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}
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}
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- return status;
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+ return ret;
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}
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static int resolve_deps(const char *src)
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@@ -643,7 +697,7 @@ static int install_all(int argc, char **argv)
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free(dest);
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}
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- if ((ret != 0) && (!arg_optional)) {
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+ if ((ret != 0) && (!arg_optional)) {
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log_error("ERROR: installing '%s'", argv[i]);
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r = EXIT_FAILURE;
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}
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