#include <stdbool.h>
#include <string.h>
#include <com32.h>
+#include <stdio.h>
+#include <sys/dirent.h>
#include "core.h"
#include "disk.h"
-#include "dir.h"
/*
* Maximum number of open files. This is *currently* constrained by the
#define FILENAME_MAX_LG2 8
#define FILENAME_MAX (1 << FILENAME_MAX_LG2)
+#define CURRENTDIR_MAX FILENAME_MAX
+
+#define BLOCK_SIZE(fs) ((fs)->block_size)
+#define BLOCK_SHIFT(fs) ((fs)->block_shift)
+#define SECTOR_SIZE(fs) ((fs)->sector_size)
+#define SECTOR_SHIFT(fs) ((fs)->sector_shift)
+
struct fs_info {
const struct fs_ops *fs_ops;
struct device *fs_dev;
+ void *fs_info; /* The fs-specific information */
+ int sector_shift, sector_size;
+ int block_shift, block_size;
+ struct inode *root, *cwd; /* Root and current directories */
+ char cwd_name[CURRENTDIR_MAX]; /* Current directory by name */
};
-struct open_file_t; /* Filesystem private structure */
-
-struct file {
- struct open_file_t *open_file; /* Filesystem private data */
- struct fs_info *fs;
- uint32_t file_len;
-};
+extern struct fs_info *this_fs;
+struct dirent; /* Directory entry structure */
+struct file;
enum fs_flags {
- FS_NODEV = 1,
+ FS_NODEV = 1 << 0,
+ FS_USEMEM = 1 << 1, /* If we need a malloc routine, set it */
+ FS_THISIND = 1 << 2, /* Set cwd based on config file location */
};
struct fs_ops {
enum fs_flags fs_flags;
int (*fs_init)(struct fs_info *);
- void (*searchdir)(char *, struct file *);
+ void (*searchdir)(const char *, struct file *);
uint32_t (*getfssec)(struct file *, char *, int, bool *);
void (*close_file)(struct file *);
void (*mangle_name)(char *, const char *);
- char * (*unmangle_name)(char *, const char *);
- void (*load_config)(com32sys_t *);
+ size_t (*realpath)(struct fs_info *, char *, const char *, size_t);
+ int (*chdir)(struct fs_info *, const char *);
+ int (*load_config)(void);
+
+ struct inode * (*iget_root)(struct fs_info *);
+ struct inode * (*iget)(const char *, struct inode *);
+ int (*readlink)(struct inode *, char *);
- /* the _dir_ stuff */
- void (*readdir)(struct fs_info *, DIR *);
+ /* the _dir_ stuff */
+ struct dirent * (*readdir)(struct file *);
+
+ int (*next_extent)(struct inode *, uint32_t);
};
-enum dev_type {CHS, EDD};
+enum inode_mode {I_FILE, I_DIR, I_SYMLINK};
/*
- * Generic functions that filesystem drivers may choose to use
+ * Extent structure: contains the mapping of some chunk of a file
+ * that is contiguous on disk.
*/
-void generic_mangle_name(char *, const char *);
-#define generic_unmangle_name stpcpy
+struct extent {
+ sector_t pstart; /* Physical start sector */
+ uint32_t lstart; /* Logical start sector */
+ uint32_t len; /* Number of contiguous sectors */
+};
+
+/* Special sector numbers used for struct extent.pstart */
+#define EXTENT_ZERO ((sector_t)-1) /* All-zero extent */
+#define EXTENT_VOID ((sector_t)-2) /* Invalid information */
+
+#define EXTENT_SPECIAL(x) ((x) >= EXTENT_VOID)
+
+/*
+ * The inode structure, including the detail file information
+ */
+struct inode {
+ struct fs_info *fs; /* The filesystem this inode is associated with */
+ int refcnt;
+ int mode; /* FILE , DIR or SYMLINK */
+ uint32_t size;
+ uint32_t blocks; /* How many blocks the file take */
+ uint32_t ino; /* Inode number */
+ uint32_t atime; /* Access time */
+ uint32_t mtime; /* Modify time */
+ uint32_t ctime; /* Create time */
+ uint32_t dtime; /* Delete time */
+ uint32_t flags;
+ uint32_t file_acl;
+ struct extent this_extent, next_extent;
+ char pvt[0]; /* Private filesystem data */
+};
+
+struct open_file_t;
+
+struct file {
+ struct fs_info *fs;
+ uint32_t file_len;
+ union {
+ /* For the new universal-path_lookup */
+ struct {
+ struct inode *inode; /* The file-specific information */
+ uint32_t offset; /* for next read */
+ };
+
+ /* For the old searchdir method */
+ struct {
+ struct open_file_t *open_file;/* The fs-specific open file struct */
+ };
+ };
+};
+
+
+enum dev_type {CHS, EDD};
/*
* Struct device contains:
* the pointer points to the disk structure,
* the cache stuff.
*/
+struct cache;
+
struct device {
struct disk *disk;
/* the cache stuff */
- char* cache_data;
- void* cache_head;
+ char *cache_data;
+ struct cache *cache_head;
uint16_t cache_block_size;
uint16_t cache_entries;
uint32_t cache_size;
return (unsigned char)c > ' ';
}
-/*
- * functions
+/*
+ * Inode allocator/deallocator
+ */
+struct inode *alloc_inode(struct fs_info *fs, uint32_t ino, size_t data);
+static inline void free_inode(struct inode * inode)
+{
+ free(inode);
+}
+
+static inline struct inode *get_inode(struct inode *inode)
+{
+ inode->refcnt++;
+ return inode;
+}
+static inline void put_inode(struct inode *inode)
+{
+ if (! --inode->refcnt)
+ free(inode);
+}
+
+static inline void malloc_error(char *obj)
+{
+ printf("Out of memory: can't allocate memory for %s\n", obj);
+ kaboom();
+}
+
+/*
+ * File handle conversion functions
+ */
+extern struct file files[];
+static inline uint16_t file_to_handle(struct file *file)
+{
+ return file ? (file - files)+1 : 0;
+}
+static inline struct file *handle_to_file(uint16_t handle)
+{
+ return handle ? &files[handle-1] : NULL;
+}
+
+/* fs.c */
+void pm_mangle_name(com32sys_t *);
+void pm_searchdir(com32sys_t *);
+void mangle_name(char *, const char *);
+int searchdir(const char *name);
+void _close_file(struct file *);
+size_t pmapi_read_file(uint16_t *handle, void *buf, size_t sectors);
+int open_file(const char *name, struct com32_filedata *filedata);
+void pm_open_file(com32sys_t *);
+void close_file(uint16_t handle);
+void pm_close_file(com32sys_t *);
+
+/* chdir.c */
+void pm_realpath(com32sys_t *regs);
+size_t realpath(char *dst, const char *src, size_t bufsize);
+int chdir(const char *src);
+
+/* readdir.c */
+DIR *opendir(const char *pathname);
+struct dirent *readdir(DIR *dir);
+int closedir(DIR *dir);
+
+/*
+ * Generic functions that filesystem drivers may choose to use
*/
-void mangle_name(com32sys_t *);
-void searchdir(com32sys_t *);
+/* mangle.c */
+void generic_mangle_name(char *, const char *);
+
+/* loadconfig.c */
+int generic_load_config(void);
+
+/* close.c */
+void generic_close_file(struct file *file);
+
+/* getfssec.c */
+uint32_t generic_getfssec(struct file *file, char *buf,
+ int sectors, bool *have_more);
+/* nonextextent.c */
+int no_next_extent(struct inode *, uint32_t);
#endif /* FS_H */
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