libmount: add mnt_copy_fs() and mnt_fs_set_root()

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/shlibs/mount/src/fs.c b/shlibs/mount/src/fs.c
index 0c9e06ea01667da60f564f3998482302e53e525e..f0eae744878246a44df38e4986065eb6be9cd277 100644 (file)
--- a/shlibs/mount/src/fs.c
+++ b/shlibs/mount/src/fs.c
@@ -17,6 +17,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <blkid.h>
+#include <stddef.h>
 
 #include "nls.h"
 #include "mountP.h"
@@ -61,6 +62,68 @@ void mnt_free_fs(mnt_fs *fs)
        free(fs);
 }
 
+static inline int cpy_str_item(void *new, void *old, size_t offset)
+{
+       char **o = (char **) (old + offset);
+       char **n = (char **) (new + offset);
+
+       if (!*o)
+               return 0;       /* source (old) is empty */
+
+       *n = strdup(*o);
+       if (!*n)
+               return -1;
+       return 0;
+}
+
+/**
+ * mnt_copy_fs:
+ * @fs: source FS
+ *
+ * This function does not copy userdata (se mnt_fs_set_userdata()). A new copy is
+ * not linked with any existing mnt_tab.
+ *
+ * Returns: copy of @fs
+ */
+mnt_fs *mnt_copy_fs(mnt_fs *fs)
+{
+       mnt_fs *n = mnt_new_fs();
+
+       if (!n)
+               return NULL;
+
+       n->id         = fs->id;
+       n->parent     = fs->parent;
+       n->devno      = fs->devno;
+
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, source)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, tagname)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, tagval)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, root)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, target)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, fstype)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, optstr)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, vfs_optstr)))
+               goto err;
+       if (cpy_str_item(n, fs, offsetof(struct _mnt_fs, fs_optstr)))
+               goto err;
+       n->freq       = fs->freq;
+       n->passno     = fs->passno;
+       n->flags      = fs->flags;
+
+       return n;
+err:
+       mnt_free_fs(n);
+       return NULL;
+}
+
 /**
  * mnt_fs_get_userdata:
  * @fs: mnt_file instance
@@ -482,6 +545,30 @@ const char *mnt_fs_get_root(mnt_fs *fs)
        return fs ? fs->root : NULL;
 }
 
+/**
+ * mnt_fs_set_root:
+ * @fs: mountinfo entry
+ * @root: path
+ *
+ * Returns: 0 on success or -1 in case of error.
+ */
+int mnt_fs_set_root(mnt_fs *fs, const char *root)
+{
+       char *p = NULL;
+
+       assert(fs);
+       if (!fs)
+               return -1;
+       if (root) {
+               p = strdup(root);
+               if (!p)
+                       return -1;
+       }
+       free(fs->root);
+       fs->root = p;
+       return 0;
+}
+
 /**
  * mnt_fs_get_id:
  * @fs: /proc/self/mountinfo entry

diff --git a/shlibs/mount/src/mount.h.in b/shlibs/mount/src/mount.h.in
index af1dd38a48d6a81337f66d057c7bdcde27da4426..33f8d1722f1a7219305fe548728802d6fe1fa4b3 100644 (file)
--- a/shlibs/mount/src/mount.h.in
+++ b/shlibs/mount/src/mount.h.in
@@ -146,7 +146,7 @@ extern int mnt_optstr_set_option(char **optstr, const char *name,
                                const char *value);
 extern int mnt_optstr_remove_option(char **optstr, const char *name);
 
-extern int mnt_split_optstr(char *optstr, char **user, char **vfs, char **fs);
+extern int mnt_split_optstr(const char *optstr, char **user, char **vfs, char **fs);
 
 /* iter.c */
 enum {
@@ -224,6 +224,7 @@ extern int mnt_lock_file(mnt_lock *ml);
 /* fs.c */
 extern mnt_fs *mnt_new_fs(void);
 extern void mnt_free_fs(mnt_fs *ent);
+extern mnt_fs *mnt_copy_fs(mnt_fs *fs);
 extern void *mnt_fs_get_userdata(mnt_fs *fs);
 extern int mnt_fs_set_userdata(mnt_fs *fs, void *data);
 extern const char *mnt_fs_get_source(mnt_fs *ent);
@@ -244,6 +245,7 @@ extern int mnt_fs_set_freq(mnt_fs *ent, int freq);
 extern int mnt_fs_get_passno(mnt_fs *ent);
 extern int mnt_fs_set_passno(mnt_fs *ent, int passno);
 extern const char *mnt_fs_get_root(mnt_fs *fs);
+extern int mnt_fs_set_root(mnt_fs *fs, const char *root);
 extern int mnt_fs_get_id(mnt_fs *fs);
 extern int mnt_fs_get_parent_id(mnt_fs *fs);
 extern dev_t mnt_fs_get_devno(mnt_fs *fs);

diff --git a/shlibs/mount/src/mount.sym b/shlibs/mount/src/mount.sym
index 7824597c06f478be697b18bb337df1c1eb90eb54..d37bb8b128e1f2bb0b8d94af79b262979fd632ad 100644 (file)
--- a/shlibs/mount/src/mount.sym
+++ b/shlibs/mount/src/mount.sym
@@ -10,6 +10,7 @@ global:
        mnt_cache_find_tag;
        mnt_cache_find_tag_value;
        mnt_cache_read_tags;
+       mnt_copy_fs;
        mnt_free_cache;
        mnt_free_fs;
        mnt_free_iter;
@@ -42,6 +43,7 @@ global:
        mnt_fs_set_fstype;
        mnt_fs_set_optstr;
        mnt_fs_set_passno;
+       mnt_fs_set_root;
        mnt_fs_set_source;
        mnt_fs_set_target;
        mnt_fs_set_userdata;