Function dfs_filesystem_lookup

components/dfs/dfs_v1/src/dfs_fs.c:78–114

* this function will return the file system mounted on specified path. * * @param path the specified path string. * * @return the found file system or NULL if no file system mounted on * specified path */

 * specified path
 */
struct dfs_filesystem *dfs_filesystem_lookup(const char *path)
{
    struct dfs_filesystem *iter;
    struct dfs_filesystem *fs = NULL;
    uint32_t fspath, prefixlen;

    prefixlen = 0;

    RT_ASSERT(path);

    /* lock filesystem */
    dfs_lock();

    /* lookup it in the filesystem table */
    for (iter = &filesystem_table[0];
            iter < &filesystem_table[DFS_FILESYSTEMS_MAX]; iter++)
    {
        if ((iter->path == NULL) || (iter->ops == NULL))
            continue;

        fspath = strlen(iter->path);
        if ((fspath < prefixlen)
            || (strncmp(iter->path, path, fspath) != 0))
            continue;

        /* check next path separator */
        if (fspath > 1 && (strlen(path) > fspath) && (path[fspath] != '/'))
            continue;

        fs = iter;
        prefixlen = fspath;
    }

    dfs_unlock();

    return fs;
}

/**
 * this function will return the mounted path for specified device.