Lecture 60 - Implementing the VFS fclose functionality

src/fs/file.c

@@ -198,6 +198,21 @@ int fstat(int fd, struct file_stat* stat)
     return res;
 }
 
+int fclose(int fd)
+{
+    int res = 0;
+    struct file_descriptor* desc = file_get_descriptor(fd);
+    if (!desc)
+    {
+        res = -EIO;
+        goto out;
+    }
+
+    res = desc->filesystem->close(desc->private);
+out:
+    return res;
+}
+
 int fseek(int fd, int offset, FILE_SEEK_MODE whence)
 {
     int res = 0;

src/fs/file.h

@@ -34,6 +34,8 @@ typedef void*(*FS_OPEN_FUNCTION)(struct disk* disk, struct path_part* path, FILE
 typedef int (*FS_READ_FUNCTION)(struct disk* disk, void* private, uint32_t size, uint32_t nmemb, char* out);
 typedef int (*FS_RESOLVE_FUNCTION)(struct disk* disk);
 
+typedef int (*FS_CLOSE_FUNCTION)(void* private);
+
 typedef int (*FS_SEEK_FUNCTION)(void* private, uint32_t offset, FILE_SEEK_MODE seek_mode);
 
 
@@ -53,6 +55,7 @@ struct filesystem
     FS_READ_FUNCTION read;
     FS_SEEK_FUNCTION seek;
     FS_STAT_FUNCTION stat;
+    FS_CLOSE_FUNCTION close;
     char name[20];
 };
 
@@ -76,6 +79,7 @@ int fopen(const char* filename, const char* mode_str);
 int fseek(int fd, int offset, FILE_SEEK_MODE whence);
 int fread(void* ptr, uint32_t size, uint32_t nmemb, int fd);
 int fstat(int fd, struct file_stat* stat);
+int fclose(int fd);
 
 void fs_insert_filesystem(struct filesystem* filesystem);
 struct filesystem* fs_resolve(struct disk* disk);