tar: use ctime, not mtime, when checking placeholders

* src/extract.c (struct delayed_link): Rename member mtime to ctime.
All uses changed to use ctime rather than mtime.

diff --git a/src/extract.c b/src/extract.c
index 653e2a0d2f879f4bf95442275928ba69a4d129cb..dad7746e0a702cc960ebc953358258f617ce2ed1 100644 (file)
--- a/src/extract.c
+++ b/src/extract.c
@@ -80,10 +80,12 @@ struct delayed_link
     /* The next delayed link in the list.  */
     struct delayed_link *next;
 
-    /* The device, inode number and last-modified time of the placeholder.  */
+    /* The device, inode number and ctime of the placeholder.  Use
+       ctime, not mtime, to make false matches less likely if some
+       other process removes the placeholder.  */
     dev_t dev;
     ino_t ino;
-    struct timespec mtime;
+    struct timespec ctime;
 
     /* True if the link is symbolic.  */
     bool is_symlink;
@@ -924,7 +926,7 @@ create_placeholder_file (char *file_name, bool is_symlink, bool *interdir_made)
       delayed_link_head = p;
       p->dev = st.st_dev;
       p->ino = st.st_ino;
-      p->mtime = get_stat_mtime (&st);
+      p->ctime = get_stat_ctime (&st);
       p->is_symlink = is_symlink;
       if (is_symlink)
        {
@@ -990,7 +992,7 @@ extract_link (char *file_name, int typeflag)
            for (; ds; ds = ds->next)
              if (ds->dev == st1.st_dev
                  && ds->ino == st1.st_ino
-                 && timespec_cmp (ds->mtime, get_stat_mtime (&st1)) == 0)
+                 && timespec_cmp (ds->ctime, get_stat_ctime (&st1)) == 0)
                {
                  struct string_list *p =  xmalloc (offsetof (struct string_list, string)
                                                    + strlen (file_name) + 1);
@@ -1347,7 +1349,7 @@ apply_delayed_links (void)
          if (lstat (source, &st) == 0
              && st.st_dev == ds->dev
              && st.st_ino == ds->ino
-             && timespec_cmp (get_stat_mtime (&st), ds->mtime) == 0)
+             && timespec_cmp (get_stat_ctime (&st), ds->ctime) == 0)
            {
              /* Unlink the placeholder, then create a hard link if possible,
                 a symbolic link otherwise.  */