Add stating on open files

4 files changed, 70 insertions, 15 deletions

diff --git a/src/common/include/fs.h b/src/common/include/fs.h
new file mode 100644
index 0000000..6cd624e
--- /dev/null
+++ b/src/common/include/fs.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef struct {
+	size_t size;
+	// TODO : times & more metadata
+} stat_t;
+
+#define FM_READ 	(0x01)
+#define FM_WRITE 	(0x02)
+#define FM_MMAP 	(0x04)
+#define FM_CREATE   (0x10)
+#define FM_TRUNC    (0x20)
+#define FM_APPEND   (0x40)
+
diff --git a/src/kernel/include/nullfs.h b/src/kernel/include/nullfs.h
index cfca023..265d41b 100644
--- a/src/kernel/include/nullfs.h
+++ b/src/kernel/include/nullfs.h
@@ -11,6 +11,7 @@ typedef struct {
 	void* (*open)(void* f, int mode, fs_handle_t *h);
 	size_t (*read)(void* f, size_t offset, size_t len, char* buf);
 	size_t (*write)(void* f, size_t offset, size_t len, const char* buf);
+	bool (*stat)(void* f, stat_t *st);
 	void (*close)(void* f);
 	void (*dispose)(void* f);
 } nullfs_node_ops_t;
diff --git a/src/kernel/include/vfs.h b/src/kernel/include/vfs.h
index 0a6a955..3ee4367 100644
--- a/src/kernel/include/vfs.h
+++ b/src/kernel/include/vfs.h
@@ -3,17 +3,7 @@
 #include <stdbool.h>
 #include <malloc.h>
 
-typedef struct {
-	// TODO
-	// (should also be moved to a user-visible header)
-} stat_t;
-
-#define FM_READ 	(0x01)
-#define FM_WRITE 	(0x02)
-#define FM_MMAP 	(0x04)
-#define FM_CREATE   (0x10)
-#define FM_TRUNC    (0x20)
-#define FM_APPEND   (0x40)
+#include <fs.h> 		// common header
 
 // How to use :
 // - when using a filesystem : never call the operations in fs_*_ops_t directly, use
@@ -27,6 +17,7 @@ typedef struct {
 typedef struct {
 	size_t (*read)(void* f, size_t offset, size_t len, char* buf);
 	size_t (*write)(void* f, size_t offset, size_t len, const char* buf);
+	bool (*stat)(void* f, stat_t *st);
 	void (*close)(void* f);
 } fs_handle_ops_t;
 
diff --git a/src/kernel/user/nullfs.c b/src/kernel/user/nullfs.c
index 79611ab..382e30b 100644
--- a/src/kernel/user/nullfs.c
+++ b/src/kernel/user/nullfs.c
@@ -1,5 +1,6 @@
 #include <hashtbl.h>
 #include <string.h>
+#include <debug.h>
 
 #include <nullfs.h>
 
@@ -8,7 +9,9 @@ static bool nullfs_i_make(fs_handle_t *source, char* opts, fs_t *d);
 static bool nullfs_i_open(void* fs, const char* file, int mode, fs_handle_t *s);
 static bool nullfs_i_delete(void* fs, const char* file);
 static void nullfs_i_shutdown(void* fs);
+static bool nullfs_i_fs_stat(void* fs, const char* file, stat_t *st);
 
+static bool nullfs_i_f_stat(void* f, stat_t *st);
 static size_t nullfs_i_read(void* f, size_t offset, size_t len, char* buf);
 static size_t nullfs_i_write(void* f, size_t offset, size_t len, const char* buf);
 static void nullfs_i_close(void* f);
@@ -22,7 +25,7 @@ static fs_ops_t nullfs_ops = {
 	.open = nullfs_i_open,
 	.delete = nullfs_i_delete,
 	.rename = 0,
-	.stat = 0,
+	.stat = nullfs_i_fs_stat,
 	.ioctl = 0,
 	.add_source = 0,
 	.shutdown = nullfs_i_shutdown
@@ -31,7 +34,8 @@ static fs_ops_t nullfs_ops = {
 static fs_handle_ops_t nullfs_h_ops = {
 	.read = nullfs_i_read,
 	.write = nullfs_i_write,
-	.close = nullfs_i_close
+	.close = nullfs_i_close,
+	.stat = nullfs_i_f_stat
 };
 
 // Internal nullfs structures
@@ -122,8 +126,19 @@ bool nullfs_i_open(void* fs, const char* file, int mode, fs_handle_t *s) {
 	nullfs_t *f = (nullfs_t*)fs;
 
 	nullfs_item_t *x = (nullfs_item_t*)(hashtbl_find(f->items, file));
-	if (x == 0) return false;
-	// TODO : if null and can_create, then create.
+	if (x == 0) {
+		if (f->can_create) {
+			if (nullfs_add_ram_file(fs, file, 0, 0, false,
+						FM_READ | FM_WRITE | FM_APPEND | FM_TRUNC | FM_MMAP)) {
+				x = (nullfs_item_t*)(hashtbl_find(f->items, file));
+				ASSERT(x != 0);
+			} else {
+				return false;
+			}
+		} else {
+			return false;
+		}
+	}
 
 	nullfs_handle_t *h = (nullfs_handle_t*)malloc(sizeof(nullfs_handle_t));
 	if (h == 0) return false;
@@ -140,6 +155,15 @@ bool nullfs_i_open(void* fs, const char* file, int mode, fs_handle_t *s) {
 	return true;
 }
 
+bool nullfs_i_fs_stat(void* fs, const char* file, stat_t *st) {
+	nullfs_t *f = (nullfs_t*)fs;
+
+	nullfs_item_t *x = (nullfs_item_t*)(hashtbl_find(f->items, file));
+	if (x == 0) return false;
+
+	return x->ops->stat && x->ops->stat(x->data, st);
+}
+
 bool nullfs_i_delete(void* fs, const char* file) {
 	nullfs_t *f = (nullfs_t*)fs;
 
@@ -153,6 +177,11 @@ bool nullfs_i_delete(void* fs, const char* file) {
 	return true;
 }
 
+bool nullfs_i_f_stat(void* f, stat_t *st) {
+	nullfs_handle_t *h = (nullfs_handle_t*)f;
+	return h->item->ops->stat && h->item->ops->stat(h->item->data, st);
+}
+
 size_t nullfs_i_read(void* f, size_t offset, size_t len, char* buf) {
 	nullfs_handle_t *h = (nullfs_handle_t*)f;
 	if (!h->item->ops->read) return 0;
@@ -179,11 +208,13 @@ static void* nullfs_i_ram_open(void* f, int mode, fs_handle_t *h);
 static size_t nullfs_i_ram_read(void* f, size_t offset, size_t len, char* buf);
 static size_t nullfs_i_ram_write(void* f, size_t offset, size_t len, const char* buf);
 static void nullfs_i_ram_dispose(void* f);
+static bool nullfs_i_ram_stat(void* f, stat_t *st);
 
 static nullfs_node_ops_t nullfs_ram_ops = {
 	.open = nullfs_i_ram_open,
 	.read = nullfs_i_ram_read,
 	.write = nullfs_i_ram_write,
+	.stat = nullfs_i_ram_stat,
 	.close = 0,
 	.dispose = nullfs_i_ram_dispose
 };
@@ -228,6 +259,14 @@ void* nullfs_i_ram_open(void* fi, int mode, fs_handle_t *h) {
 	if (mode & ~f->ok_modes) {
 		return 0;
 	}
+	mode &= ~FM_CREATE;
+
+	if (mode & FM_TRUNC) {
+		if (f->data_owned) free(f->data);
+		f->data = 0;
+		f->size = 0;
+		f->data_owned = 0;
+	}
 
 	h->mode = mode;
 	return fi;
@@ -272,6 +311,13 @@ void nullfs_i_ram_dispose(void* fi) {
 	free(f);
 }
 
+bool nullfs_i_ram_stat(void* fi, stat_t *st) {
+	nullfs_ram_file_t *f = (nullfs_ram_file_t*)fi;
+
+	st->size = f->size;
+	return true;
+}
+
 
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/