LU-12682 llite: fake symlink type of foreign file/dir

[fs/lustre-release.git] / lustre / utils / liblustreapi_util.c

diff --git a/lustre/utils/liblustreapi_util.c b/lustre/utils/liblustreapi_util.c
index e8af531..60ded02 100644 (file)
--- a/lustre/utils/liblustreapi_util.c
+++ b/lustre/utils/liblustreapi_util.c
@@ -41,6 +41,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
+#include <libgen.h> /* for dirname() */
 #include <lustre/lustreapi.h>
 #include <linux/lustre/lustre_ver.h>   /* only until LUSTRE_VERSION_CODE is gone */
 #include "lustreapi_internal.h"
@@ -312,6 +313,92 @@ retry_open:
        return rc ? -errno : 0;
 }
 
+int llapi_direntry_remove(char *dname)
+{
+       char *dirpath = NULL;
+       char *namepath = NULL;
+       char *dir;
+       char *filename;
+       int fd = -1;
+       int rc = 0;
+
+       dirpath = strdup(dname);
+       namepath = strdup(dname);
+       if (!dirpath || !namepath)
+               return -ENOMEM;
+
+       filename = basename(namepath);
+
+       dir = dirname(dirpath);
+
+       fd = open(dir, O_DIRECTORY | O_RDONLY);
+       if (fd < 0) {
+               rc = -errno;
+               llapi_error(LLAPI_MSG_ERROR, rc, "unable to open '%s'",
+                           filename);
+               goto out;
+       }
+
+       if (ioctl(fd, LL_IOC_REMOVE_ENTRY, filename))
+               llapi_error(LLAPI_MSG_ERROR, errno,
+                           "error on ioctl %#lx for '%s' (%d)",
+                           (long)LL_IOC_LMV_SETSTRIPE, filename, fd);
+out:
+       free(dirpath);
+       free(namepath);
+       if (fd != -1)
+               close(fd);
+       return rc;
+}
+
+int llapi_unlink_foreign(char *name)
+{
+       int fd = -1;
+       int rc = 0;
+
+       fd = open(name, O_DIRECTORY | O_RDONLY | O_NOFOLLOW);
+       if (fd < 0 && errno != ENOTDIR) {
+               rc = -errno;
+               llapi_error(LLAPI_MSG_ERROR, rc, "unable to open '%s'", name);
+               goto out;
+       } else if (errno == ENOTDIR) {
+               fd = open(name, O_RDONLY | O_NOFOLLOW);
+               if (fd < 0) {
+                       rc = -errno;
+                       llapi_error(LLAPI_MSG_ERROR, rc, "unable to open '%s'",
+                                   name);
+                       goto out;
+               }
+       }
+
+       /* allow foreign symlink file/dir to be unlinked */
+       if (ioctl(fd, LL_IOC_UNLOCK_FOREIGN)) {
+               llapi_error(LLAPI_MSG_ERROR, errno,
+                           "error on ioctl %#lx for '%s' (%d)",
+                           (long)LL_IOC_UNLOCK_FOREIGN, name, fd);
+               rc = -errno;
+       }
+
+       /* XXX do not set AT_REMOVEDIR in flags even for a dir, as due to the
+        * hack for foreign symlink it will fail the directory check in
+        * Kernel's syscall code and return ENOTDIR, so treat all as files
+        */
+       rc = unlinkat(AT_FDCWD, name, 0);
+       if (rc == -1 && errno == EISDIR)
+               rc = unlinkat(AT_FDCWD, name, AT_REMOVEDIR);
+
+       if (rc == -1) {
+               llapi_error(LLAPI_MSG_ERROR, errno,
+                           "error on unlinkat for '%s' (%d)", name, fd);
+               rc = -errno;
+       }
+
+out:
+       if (fd != -1)
+               close(fd);
+       return rc;
+}
+
 int llapi_get_fsname_instance(const char *path, char *fsname, size_t fsname_len,
                              char *instance, size_t instance_len)
 {