return tb ? tb->cache : NULL;
}
+/**
+ * mnt_table_find_fs:
+ * @tb: tab pointer
+ * @fs: entry to look for
+ *
+ * Checks if @fs is part of table @tb.
+ *
+ * Returns: index of @fs in table, 0 if not found or negative number in case of error.
+ */
+int mnt_table_find_fs(struct libmnt_table *tb, struct libmnt_fs *fs)
+{
+ struct list_head *p;
+ int i = 0;
+
+ if (!tb || !fs)
+ return -EINVAL;
+
+ if (list_empty(&fs->ents))
+ return 0;
+
+ /* Let's use directly list rather than mnt_table_next_fs() as we
+ * compare list entry with fs only.
+ */
+ list_for_each(p, &tb->ents) {
+ ++i;
+ if (list_entry(p, struct libmnt_fs, ents) == fs)
+ return i;
+ }
+
+ return 0;
+}
+
/**
* mnt_table_add_fs:
* @tb: tab pointer
return 0;
}
+static int __table_insert_fs(
+ struct libmnt_table *tb, int before,
+ struct libmnt_fs *pos, struct libmnt_fs *fs)
+{
+ struct list_head *head = pos ? &pos->ents : &tb->ents;
+
+ if (before)
+ list_add(&fs->ents, head);
+ else
+ list_add_tail(&fs->ents, head);
+
+ tb->nents++;
+
+ DBG(TAB, ul_debugobj(tb, "insert entry: %s %s",
+ mnt_fs_get_source(fs), mnt_fs_get_target(fs)));
+ return 0;
+}
+
+/**
+ * mnt_table_insert_fs:
+ * @tb: tab pointer
+ * @before: 1 to insert before pos, 0 to insert after pos
+ * @pos: entry to specify position or NULL
+ * @fs: new entry
+ *
+ * Adds a new entry to @tb before or after a specific table entry @pos. If the
+ * @pos is NULL than add the begin of the @tab if @before is 1; or to the tail
+ * of the @tb if @before is 0.
+ *
+ * This function inncrements reference to @fs. Don't forget to use
+ * mnt_unref_fs() after mnt_table_insert_fs() if you want to keep the @fs
+ * referenced by the table only.
+
+ *
+ * Returns: 0 on success or negative number in case of error.
+ */
+int mnt_table_insert_fs(struct libmnt_table *tb, int before,
+ struct libmnt_fs *pos, struct libmnt_fs *fs)
+{
+ if (!tb || !fs)
+ return -EINVAL;
+
+ if (!list_empty(&fs->ents))
+ return -EBUSY;
+
+ if (pos && mnt_table_find_fs(tb, pos) < 1)
+ return -ENOENT;
+
+ mnt_ref_fs(fs);
+ return __table_insert_fs(tb, before, pos, fs);
+}
+
+/**
+ * mnt_table_move_fs:
+ * @src: tab pointer of source table
+ * @dst: tab pointer of destination table
+ * @before: 1 to move before position, 0 to move after position
+ * @pos: entry to specify position or NULL
+ * @fs: entry to move
+ *
+ * Removes @fs from @src table and adds it before/after a specific entry @pos
+ * of @dst table. If the @pos is NULL than add the begin of the @dst if @before
+ * is 1; or to the tail of the @dst if @before is 0.
+ *
+ * The reference counter of @fs is not modified.
+ *
+ * Returns: 0 on success or negative number in case of error.
+ */
+int mnt_table_move_fs(struct libmnt_table *src, struct libmnt_table *dst,
+ int before, struct libmnt_fs *pos, struct libmnt_fs *fs)
+{
+ if (!src || !dst || !fs)
+ return -EINVAL;
+
+ if (mnt_table_find_fs(src, fs) < 1)
+ return -ENOENT;
+
+ if (pos && mnt_table_find_fs(dst, pos) < 1)
+ return -ENOENT;
+
+ /* remove from source */
+ list_del_init(&fs->ents);
+ src->nents--;
+
+ /* insert to the destination */
+ return __table_insert_fs(dst, before, pos, fs);
+}
+
+
/**
* mnt_table_remove_fs:
* @tb: tab pointer
*/
int mnt_table_remove_fs(struct libmnt_table *tb, struct libmnt_fs *fs)
{
- if (!tb || !fs)
+ if (!tb || !fs || mnt_table_find_fs(tb, fs) < 1)
return -EINVAL;
- list_del(&fs->ents);
- INIT_LIST_HEAD(&fs->ents); /* otherwise FS still points to the list */
+ list_del_init(&fs->ents);
mnt_unref_fs(fs);
tb->nents--;
return rc;
}
+static int test_find_idx(struct libmnt_test *ts, int argc, char *argv[])
+{
+ struct libmnt_table *tb;
+ struct libmnt_fs *fs = NULL;
+ struct libmnt_cache *mpc = NULL;
+ const char *file, *what;
+ int rc = -1;
+
+ if (argc != 3) {
+ fprintf(stderr, "try --help\n");
+ return -EINVAL;
+ }
+
+ file = argv[1], what = argv[2];
+
+ tb = create_table(file, FALSE);
+ if (!tb)
+ goto done;
+
+ /* create a cache for canonicalized paths */
+ mpc = mnt_new_cache();
+ if (!mpc)
+ goto done;
+ mnt_table_set_cache(tb, mpc);
+ mnt_unref_cache(mpc);
+
+ fs = mnt_table_find_target(tb, what, MNT_ITER_BACKWARD);
+
+ if (!fs)
+ fprintf(stderr, "%s: not found '%s'\n", file, what);
+ else {
+ int idx = mnt_table_find_fs(tb, fs);
+
+ if (idx < 1)
+ fprintf(stderr, "%s: not found '%s' fs pointer", file, what);
+ else {
+ printf("%s index is %d\n", what, idx);
+ rc = 0;
+ }
+ }
+done:
+ mnt_unref_table(tb);
+ return rc;
+}
+
static int test_find(struct libmnt_test *ts, int argc, char *argv[], int dr)
{
struct libmnt_table *tb;
{ "--find-backward", test_find_bw, "<file> <source|target> <string>" },
{ "--uniq-target", test_uniq, "<file>" },
{ "--find-pair", test_find_pair, "<file> <source> <target>" },
+ { "--find-fs", test_find_idx, "<file> <target>" },
{ "--find-mountpoint", test_find_mountpoint, "<path>" },
{ "--copy-fs", test_copy_fs, "<file> copy root FS from the file" },
{ "--is-mounted", test_is_mounted, "<fstab> check what from fstab is already mounted" },
projects / thirdparty / util-linux.git / blobdiff