Change VFS interface : handles no longer visible to underlying FS.

11 files changed, 179 insertions, 259 deletions

diff --git a/src/apps/init/main.c b/src/apps/init/main.c
index 368322c..b351615 100644
--- a/src/apps/init/main.c
+++ b/src/apps/init/main.c
@@ -9,31 +9,45 @@
 int main(int argc, char **argv) {
 	dbg_print("Hello, world! from user process.\n");
 
-	fd_t f = open("io:/", FM_READDIR);
-	dbg_printf("openned /: %d\n", f);
-	dirent_t x;
-	while (readdir(f, &x)) {
-		dbg_printf("- '%s' %p %d\n", x.name, x.st.type, x.st.size);
-		if (x.st.type == FT_REGULAR) {
-			char buf[256];
-			strcpy(buf, "io:/");
-			strcpy(buf+4, x.name);
-			dbg_printf("trying to open %s...\n", buf);
-			fd_t ff = open(buf, FM_READ);
-			if (ff != 0) {
-				dbg_printf("ok, open as %d\n", ff);
-				char* cont = malloc(x.st.size + 1);
-				dbg_print_region_info();
-				read(ff, 0, x.st.size, cont);
-				cont[x.st.size] = 0;
-				dbg_printf("> '%s'\n", cont);
-				close(ff);
-			} else {
-				dbg_printf("Could not open '%s'\n", buf);
+	{
+		fd_t f = open("io:/", FM_READDIR);
+		dbg_printf("openned io:/ as %d\n", f);
+		dirent_t x;
+		size_t ent_no = 0;
+		while (readdir(f, ent_no++, &x)) {
+			dbg_printf("- '%s' %p %d\n", x.name, x.st.type, x.st.size);
+			if (x.st.type == FT_REGULAR) {
+				char buf[256];
+				strcpy(buf, "io:/");
+				strcpy(buf+4, x.name);
+				dbg_printf("trying to open %s...\n", buf);
+				fd_t ff = open(buf, FM_READ);
+				if (ff != 0) {
+					dbg_printf("ok, open as %d\n", ff);
+					char* cont = malloc(x.st.size + 1);
+					dbg_print_region_info();
+					read(ff, 0, x.st.size, cont);
+					cont[x.st.size] = 0;
+					dbg_printf("> '%s'\n", cont);
+					close(ff);
+				} else {
+					dbg_printf("Could not open '%s'\n", buf);
+				}
 			}
 		}
+		close(f);
+	}
+
+	{
+		fd_t f = open("root:/", FM_READDIR);
+		dbg_printf("openned root:/ as %d\n", f);
+		dirent_t x;
+		size_t ent_no = 0;
+		while (readdir(f, ent_no++, &x)) {
+			dbg_printf("- '%s' %p %d\n", x.name, x.st.type, x.st.size);
+		}
+		close(f);
 	}
-	close(f);
 
 	return 0;
 }
diff --git a/src/common/include/syscallproto.h b/src/common/include/syscallproto.h
index 507bc2b..7b85a49 100644
--- a/src/common/include/syscallproto.h
+++ b/src/common/include/syscallproto.h
@@ -22,7 +22,7 @@
 #define SC_CLOSE		31		// args: fd
 #define SC_READ			32		// args: fd, offset, size, out char* data
 #define SC_WRITE		33		// args: fd, offset, size, data
-#define SC_READDIR		34		// args: fd, out dirent_t *data
+#define SC_READDIR		34		// args: fd, ent_no, out dirent_t *data
 #define SC_STAT_OPEN	35		// args: fd, out stat_t *data -- stat on open file handle
 #define SC_IOCTL		36		// args: fd, command, out void* data
 #define SC_GET_MODE		37		// args: fd -- get mode for open file handle
diff --git a/src/kernel/dev/pciide.c b/src/kernel/dev/pciide.c
index 927e9da..05c0b28 100644
--- a/src/kernel/dev/pciide.c
+++ b/src/kernel/dev/pciide.c
@@ -645,13 +645,13 @@ typedef struct {
 	uint8_t type;
 } ide_vfs_dev_t;
 
-static bool ide_vfs_open(fs_node_ptr n, int mode, fs_handle_t *s);
+static bool ide_vfs_open(fs_node_ptr n, int mode);
 static bool ide_vfs_stat(fs_node_ptr n, stat_t *st);
 
-static size_t ide_vfs_read(fs_handle_ptr f, size_t offset, size_t len, char* buf);
-static size_t ide_vfs_write(fs_handle_ptr f, size_t offset, size_t len, const char* buf);
-static int ide_vfs_ioctl(fs_handle_ptr f, int command, void* data);
-static void ide_vfs_close(fs_handle_ptr f);
+static size_t ide_vfs_read(fs_node_ptr f, size_t offset, size_t len, char* buf);
+static size_t ide_vfs_write(fs_node_ptr f, size_t offset, size_t len, const char* buf);
+static int ide_vfs_ioctl(fs_node_ptr f, int command, void* data);
+static void ide_vfs_close(fs_node_ptr f);
 
 static fs_node_ops_t ide_vfs_node_ops = {
 	.open = ide_vfs_open,
@@ -660,17 +660,12 @@ static fs_node_ops_t ide_vfs_node_ops = {
 	.delete = 0,
 	.move = 0,
 	.create = 0,
-	.dispose = 0
-};
-
-static fs_handle_ops_t ide_vfs_handle_ops = {
+	.dispose = 0,
 	.read = ide_vfs_read,
 	.write = ide_vfs_write,
 	.ioctl = ide_vfs_ioctl,
 	.close = ide_vfs_close,
 	.readdir = 0,
-	.get_page = 0,
-	.commit_page = 0
 };
 
 void ide_register_device(ide_controller_t *c, uint8_t device, fs_t *iofs) {
@@ -700,7 +695,7 @@ void ide_register_device(ide_controller_t *c, uint8_t device, fs_t *iofs) {
 	}
 }
 
-bool ide_vfs_open(fs_node_ptr n, int mode, fs_handle_t *s) {
+bool ide_vfs_open(fs_node_ptr n, int mode) {
 	ide_vfs_dev_t *d = (ide_vfs_dev_t*)n;
 
 	int ok_modes = (FM_READ
@@ -708,10 +703,6 @@ bool ide_vfs_open(fs_node_ptr n, int mode, fs_handle_t *s) {
 				| FM_IOCTL);
 	if (mode & ~ok_modes) return false;
 
-	s->ops = &ide_vfs_handle_ops;
-	s->data = d;
-	s->mode = mode;
-
 	return true;
 }
 
@@ -725,7 +716,7 @@ bool ide_vfs_stat(fs_node_ptr n, stat_t *st) {
 	return true;
 }
 
-size_t ide_vfs_read(fs_handle_ptr f, size_t offset, size_t len, char* buf) {
+size_t ide_vfs_read(fs_node_ptr f, size_t offset, size_t len, char* buf) {
 	ide_vfs_dev_t *d = (ide_vfs_dev_t*)f;
 
 	if (offset % d->block_size != 0) return 0;
@@ -737,7 +728,7 @@ size_t ide_vfs_read(fs_handle_ptr f, size_t offset, size_t len, char* buf) {
 	return len;
 }
 
-size_t ide_vfs_write(fs_handle_ptr f, size_t offset, size_t len, const char* buf) {
+size_t ide_vfs_write(fs_node_ptr f, size_t offset, size_t len, const char* buf) {
 	ide_vfs_dev_t *d = (ide_vfs_dev_t*)f;
 
 	if (offset % d->block_size != 0) return 0;
@@ -749,7 +740,7 @@ uint8_t err = ide_write_sectors(d->c, d->device,
 	return len;
 }
 
-int ide_vfs_ioctl(fs_handle_ptr f, int command, void* data) {
+int ide_vfs_ioctl(fs_node_ptr f, int command, void* data) {
 	ide_vfs_dev_t *d = (ide_vfs_dev_t*)f;
 
 	int ret = 0;
@@ -762,7 +753,7 @@ int ide_vfs_ioctl(fs_handle_ptr f, int command, void* data) {
 	return ret;
 }
 
-void ide_vfs_close(fs_handle_ptr f) {
+void ide_vfs_close(fs_node_ptr f) {
 	// nothing to do
 }
 
diff --git a/src/kernel/fs/iso9660.c b/src/kernel/fs/iso9660.c
index 958bd9a..192f8ae 100644
--- a/src/kernel/fs/iso9660.c
+++ b/src/kernel/fs/iso9660.c
@@ -8,14 +8,14 @@ static void iso9660_fs_shutdown(fs_ptr f);
 
 static bool iso9660_node_stat(fs_node_ptr n, stat_t *st);
 static void iso9660_node_dispose(fs_node_ptr n);
-static bool iso9660_dir_open(fs_node_ptr n, int mode, fs_handle_t *s);
+static void iso9660_node_close(fs_node_ptr f);
+
+static bool iso9660_dir_open(fs_node_ptr n, int mode);
 static bool iso9660_dir_walk(fs_node_ptr n, const char* file, struct fs_node *node_d);
-static bool iso9660_file_open(fs_node_ptr n, int mode, fs_handle_t *s);
+static bool iso9660_dir_readdir(fs_node_ptr f, size_t ent_no, dirent_t *d);
 
-static size_t iso9660_fh_read(fs_handle_ptr f, size_t offset, size_t len, char* buf);
-static void iso9660_fh_close(fs_handle_ptr f);
-static bool iso9660_dh_readdir(fs_handle_ptr f, dirent_t *d);
-static void iso9660_dh_close(fs_handle_ptr f);
+static bool iso9660_file_open(fs_node_ptr n, int mode);
+static size_t iso9660_file_read(fs_node_ptr f, size_t offset, size_t len, char* buf);
 
 static fs_driver_ops_t iso9660_driver_ops = {
 	.make = iso9660_make,
@@ -34,6 +34,11 @@ static fs_node_ops_t iso9660_dir_ops = {
 	.delete = 0,
 	.move = 0,
 	.create = 0,
+	.readdir = iso9660_dir_readdir,
+	.close = iso9660_node_close,
+	.read = 0,
+	.write = 0,
+	.ioctl = 0,
 };
 
 static fs_node_ops_t iso9660_file_ops = {
@@ -44,26 +49,11 @@ static fs_node_ops_t iso9660_file_ops = {
 	.delete = 0,
 	.move = 0,
 	.create = 0,
-};
-
-static fs_handle_ops_t iso9660_dh_ops = {
-	.readdir = iso9660_dh_readdir,
-	.close = iso9660_dh_close,
-	.read = 0,
-	.write = 0,
-	.ioctl = 0,
-	.get_page = 0,
-	.commit_page = 0,
-};
-
-static fs_handle_ops_t iso9660_fh_ops = {
 	.readdir = 0,
-	.close = iso9660_fh_close,
-	.read = iso9660_fh_read,
+	.close = iso9660_node_close,
+	.read = iso9660_file_read,
 	.write = 0,
 	.ioctl = 0,
-	.get_page = 0,
-	.commit_page = 0,
 };
 
 void register_iso9660_driver() {
@@ -144,7 +134,7 @@ static void dr_stat(iso9660_dr_t *dr, stat_t *st) {
 	if (dr->flags & ISO9660_DR_FLAG_DIR) {
 		st->type = FT_DIR;
 		st->access = FM_READDIR;
-		st->size = (dr->size.lsb / 256);
+		st->size = dr->size.lsb;		// TODO: precise item count ?
 	} else {
 		st->type = FT_REGULAR;
 		st->access = FM_READ;
@@ -166,21 +156,13 @@ void iso9660_node_dispose(fs_node_ptr n) {
 	free(node);
 }
 
-bool iso9660_dir_open(fs_node_ptr n, int mode, fs_handle_t *s) {
-	iso9660_node_t *node = (iso9660_node_t*)n;
+void iso9660_node_close(fs_node_ptr f) {
+	// nothing to do
+}
 
+bool iso9660_dir_open(fs_node_ptr n, int mode) {
 	if (mode != FM_READDIR) return false;
 
-	iso9660_dh_t *handle = (iso9660_dh_t*)malloc(sizeof(iso9660_dh_t));
-	if (handle == 0) return false;
-
-	handle->n = node;
-	handle->pos = 0;
-
-	s->mode = mode;
-	s->data = handle;
-	s->ops = &iso9660_dh_ops;
-
 	return true;
 }
 
@@ -220,7 +202,11 @@ bool iso9660_dir_walk(fs_node_ptr n, const char* search_for, struct fs_node *nod
 			n->fs = node->fs;
 
 			node_d->data = n;
-			node_d->ops = (dr->flags & ISO9660_DR_FLAG_DIR ? &iso9660_dir_ops : &iso9660_file_ops);
+			if (dr->flags & ISO9660_DR_FLAG_DIR) {
+				node_d->ops = &iso9660_dir_ops;
+			} else {
+				node_d->ops = &iso9660_file_ops;
+			}
 
 			return true;
 		}
@@ -228,18 +214,13 @@ bool iso9660_dir_walk(fs_node_ptr n, const char* search_for, struct fs_node *nod
 	return false;	// not found
 }
 
-bool iso9660_file_open(fs_node_ptr n, int mode, fs_handle_t *s) {
-	iso9660_node_t *node = (iso9660_node_t*)n;
-
+bool iso9660_file_open(fs_node_ptr n, int mode) {
 	if (mode != FM_READ) return false;
 
-	s->data = node;
-	s->ops = &iso9660_fh_ops;
-	s->mode = mode;
 	return true;
 }
 
-size_t iso9660_fh_read(fs_handle_ptr f, size_t offset, size_t len, char* buf) {
+size_t iso9660_file_read(fs_node_ptr f, size_t offset, size_t len, char* buf) {
 	iso9660_node_t *node = (iso9660_node_t*)f;
 
 	if (offset >= node->dr.size.lsb) return 0;
@@ -277,43 +258,49 @@ size_t iso9660_fh_read(fs_handle_ptr f, size_t offset, size_t len, char* buf) {
 	return ret;
 }
 
-void iso9660_fh_close(fs_handle_ptr f) {
+void iso9660_file_close(fs_node_ptr f) {
 	// nothing to do
 }
 
-bool iso9660_dh_readdir(fs_handle_ptr f, dirent_t *d) {
-	iso9660_dh_t *handle = (iso9660_dh_t*)f;
-	iso9660_node_t *node = handle->n;
+bool iso9660_dir_readdir(fs_node_ptr n, size_t ent_no, dirent_t *d) {
+	// Very nonefficient !!
 
-	while (true) {
-		if (handle->pos >= node->dr.size.lsb) return false;
+	iso9660_node_t *node = (iso9660_node_t*)n;
 
-		if (handle->pos % 2048 == 0) {
-			if (file_read(node->fs->disk, node->dr.lba_loc.lsb * 2048 + handle->pos, 2048, handle->buffer) != 2048)
+	char buffer[2048];
+	size_t dr_len = 0;
+	size_t idx = 0;
+	for (size_t pos = 0; pos < node->dr.size.lsb; pos += dr_len) {
+		if (pos % 2048 == 0) {
+			if (file_read(node->fs->disk, node->dr.lba_loc.lsb * 2048 + pos, 2048, buffer) != 2048)
 				return false;
 		}
 
-		iso9660_dr_t *dr = (iso9660_dr_t*)(handle->buffer + (handle->pos % 2048));
-		if (node->fs->use_lowercase) convert_dr_to_lowercase(dr);
+		iso9660_dr_t *dr = (iso9660_dr_t*)(buffer + (pos % 2048));
+		dr_len = dr->len;
+		if (dr_len == 0) return false;
 
-		handle->pos += dr->len;
+		if (node->fs->use_lowercase) convert_dr_to_lowercase(dr);
 
+		char* name = dr->name;
 		size_t len = dr->name_len - 2;
-		if (dr->name_len > 0 && dr->name[len] == ';') {
+
+		if (name[len] != ';') continue;
+		
+		if (idx == ent_no) {
+			// Found the node we are interested in
 			if (len >= DIR_MAX) len = DIR_MAX - 1;
-			memcpy(d->name, dr->name, len);
+			memcpy(d->name, name, len);
 			d->name[len] = 0;
+
 			dr_stat(dr, &d->st);
 
 			return true;
+		} else {
+			idx++;
 		}
-		// else skip this record
 	}
-}
-
-void iso9660_dh_close(fs_handle_ptr f) {
-	iso9660_dh_t* handle = (iso9660_dh_t*)f;
-	free(handle);
+	return false;	// not found
 }
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/kernel/include/vfs.h b/src/kernel/include/vfs.h
index 066211b..6372850 100644
--- a/src/kernel/include/vfs.h
+++ b/src/kernel/include/vfs.h
@@ -32,42 +32,25 @@
 // - The VFS does not implement any locking mechanism on filesystems themselves (e.g. the add_source
 //		implementation must have its own locking system)
 
-typedef void* fs_handle_ptr;
 typedef void* fs_node_ptr;
 typedef void* fs_ptr;
 
 // usefull forward declarations
 struct fs;
 struct fs_node;
-struct fs_handle;
 
 typedef struct user_region user_region_t;
 
 // -------------------------------------------
 // Structure defining a handle to an open file
-
-typedef struct {
-	// Standard read-write architecture
-	size_t (*read)(fs_handle_ptr f, size_t offset, size_t len, char* buf);
-	size_t (*write)(fs_handle_ptr f, size_t offset, size_t len, const char* buf);
-	bool (*readdir)(fs_handle_ptr f, dirent_t *d);
-	int (*ioctl)(fs_handle_ptr f, int command, void* data);
-	void (*close)(fs_handle_ptr f);
-	// Page cache architecture, must be implemented by all files opened with FM_MMAP
-	uint32_t (*get_page)(fs_handle_ptr f, size_t offset);
-	void (*commit_page)(fs_handle_ptr f, size_t offset, uint64_t time);	// notifies change
-} fs_handle_ops_t;
+// This structure is entirely managed by the VFS, the underlying filesystem does not see it
 
 typedef struct fs_handle {
-	// These field are filled by the VFS's generic open() code
 	struct fs *fs;
 	struct fs_node *node;
 
 	int refs;
 
-	// These fields are filled by the FS's specific open() code
-	fs_handle_ops_t *ops;
-	fs_handle_ptr data;
 	int mode;
 } fs_handle_t;
 
@@ -89,8 +72,15 @@ typedef struct fs_handle {
 //	- delete() is not expected to delete recursively : it should fail on a non-empty directory
 
 typedef struct {
-	bool (*open)(fs_node_ptr n, int mode, fs_handle_t *s); 		// open current node
+	bool (*open)(fs_node_ptr n, int mode);
+	size_t (*read)(fs_node_ptr f, size_t offset, size_t len, char* buf);
+	size_t (*write)(fs_node_ptr f, size_t offset, size_t len, const char* buf);
+	bool (*readdir)(fs_node_ptr f, size_t ent_no, dirent_t *d);
+	void (*close)(fs_node_ptr f);
+
 	bool (*stat)(fs_node_ptr n, stat_t *st);
+	int (*ioctl)(fs_node_ptr f, int command, void* data);
+
 	bool (*walk)(fs_node_ptr n, const char* file, struct fs_node *node_d);
 	bool (*delete)(fs_node_ptr n, const char* file);
 	bool (*move)(fs_node_ptr dir, const char* old_name, struct fs_node *new_parent, const char *new_name);
@@ -180,9 +170,6 @@ bool file_stat(fs_handle_t *f, stat_t *st);
 size_t file_read(fs_handle_t *f, size_t offset, size_t len, char* buf);
 size_t file_write(fs_handle_t *f, size_t offset, size_t len, const char* buf);
 int file_ioctl(fs_handle_t *f, int command, void* data);
-bool file_readdir(fs_handle_t *f, dirent_t *d);
-
-uint32_t file_get_page(fs_handle_t *f, size_t offset);
-void file_commit_page(fs_handle_t *f, size_t offset, uint64_t time);
+bool file_readdir(fs_handle_t *f, size_t ent_no, dirent_t *d);
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/kernel/user/nullfs.c b/src/kernel/user/nullfs.c
index 534b0ba..77bc3e8 100644
--- a/src/kernel/user/nullfs.c
+++ b/src/kernel/user/nullfs.c
@@ -12,27 +12,23 @@ static bool nullfs_fs_make(fs_handle_t *source, const char* opts, fs_t *d);
 static void nullfs_fs_shutdown(fs_ptr fs);
 
 // nullfs directory node
-static bool nullfs_d_open(fs_node_ptr n, int mode, fs_handle_t *s);
+static bool nullfs_d_open(fs_node_ptr n, int mode);
 static bool nullfs_d_stat(fs_node_ptr n, stat_t *st);
 static bool nullfs_d_walk(fs_node_ptr n, const char* file, struct fs_node *node_d);
 static bool nullfs_d_delete(fs_node_ptr n, const char* file);
 static bool nullfs_d_move(fs_node_ptr n, const char* old_name, fs_node_t *new_parent, const char *new_name);
 static bool nullfs_d_create(fs_node_ptr n, const char* file, int type);
 static void nullfs_d_dispose(fs_node_ptr n);
-
-// nullfs directory handle
-static bool nullfs_dh_readdir(fs_handle_ptr f, dirent_t *d);
-static void nullfs_dh_close(fs_handle_ptr f);
+static bool nullfs_d_readdir(fs_node_ptr f, size_t ent_no, dirent_t *d);
+static void nullfs_d_close(fs_node_ptr f);
 
 // nullfs ram file node
-static bool nullfs_f_open(fs_node_ptr n, int mode, fs_handle_t *s);
+static bool nullfs_f_open(fs_node_ptr n, int mode);
 static bool nullfs_f_stat(fs_node_ptr n, stat_t *st);
 static void nullfs_f_dispose(fs_node_ptr n);
-
-// nullfs ram file handle
-static size_t nullfs_fh_read(fs_handle_ptr f, size_t offset, size_t len, char* buf);
-static size_t nullfs_fh_write(fs_handle_ptr f, size_t offset, size_t len, const char* buf);
-static void nullfs_fh_close(fs_handle_ptr f);
+static size_t nullfs_f_read(fs_node_ptr f, size_t offset, size_t len, char* buf);
+static size_t nullfs_f_write(fs_node_ptr f, size_t offset, size_t len, const char* buf);
+static void nullfs_f_close(fs_node_ptr f);
 
 // VTables that go with it
 static fs_driver_ops_t nullfs_driver_ops = {
@@ -52,11 +48,8 @@ static fs_node_ops_t nullfs_d_ops = {
 	.move = nullfs_d_move,
 	.create = nullfs_d_create,
 	.dispose = nullfs_d_dispose,
-};
-
-static fs_handle_ops_t nullfs_dh_ops = {
-	.readdir = nullfs_dh_readdir,
-	.close = nullfs_dh_close,
+	.readdir = nullfs_d_readdir,
+	.close = nullfs_d_close,
 	.read = 0,
 	.write = 0,
 	.ioctl = 0,
@@ -70,12 +63,9 @@ static fs_node_ops_t nullfs_f_ops = {
 	.create = 0,
 	.delete = 0,
 	.move = 0,
-};
-
-static fs_handle_ops_t nullfs_fh_ops = {
-	.read = nullfs_fh_read,
-	.write = nullfs_fh_write,
-	.close = nullfs_fh_close,
+	.read = nullfs_f_read,
+	.write = nullfs_f_write,
+	.close = nullfs_f_close,
 	.readdir = 0,
 	.ioctl =0,
 };
@@ -104,13 +94,9 @@ typedef struct {
 	mutex_t lock;
 
 	nullfs_t *fs;
-} nullfs_dir_t;
 
-typedef struct {
-	nullfs_dir_t *d;
-	int nitems, i;
-	dirent_t *items;
-} nullfs_dh_t;
+	fs_node_t *vfs_node;
+} nullfs_dir_t;
 
 typedef struct {
 	char* data;
@@ -119,6 +105,8 @@ typedef struct {
 	int ok_modes;
 	
 	mutex_t lock;		// locked on open
+
+	fs_node_t *vfs_node;
 } nullfs_file_t;
 
 // No nullfs_file_handle_t struct, we don't need it. The handle's data
@@ -235,54 +223,10 @@ bool nullfs_add_ram_file(fs_t *fs, const char* name, char* data, size_t init_sz,
 
 //   -- Directory node --
 
-bool nullfs_d_open(fs_node_ptr n, int mode, fs_handle_t *s) {
+bool nullfs_d_open(fs_node_ptr n, int mode) {
 	if (mode != FM_READDIR) return false;
 
-	nullfs_dir_t* d = (nullfs_dir_t*)n;
-
-	bool got_lock = mutex_try_lock(&d->lock);
-	if (!got_lock) return false;
-
-	nullfs_dh_t *h = (nullfs_dh_t*)malloc(sizeof(nullfs_dh_t));
-	if (h == 0) goto fail;
-
-	h->nitems = hashtbl_count(d->items_idx);
-	if (h->nitems > 0) {
-		h->items = (dirent_t*)malloc(h->nitems * sizeof(dirent_t));
-		if (h->nitems == 0) goto fail;
-
-		int i = 0;
-		for (nullfs_item_t *it = d->items_list; it != 0; it = it->next) {
-			strncpy(h->items[i].name, it->name, DIR_MAX);
-			h->items[i].name[DIR_MAX-1] = 0;	// make sur it's null-terminated
-			if (it->ops->stat) {
-				it->ops->stat(it->data, &h->items[i].st);
-			} else {
-				// no stat operation : should we do something else ?
-				memset(&h->items[i].st, 0, sizeof(stat_t));
-			}
-
-			i++;
-		}
-		ASSERT(i == h->nitems);
-	}
-
-	h->d = d;
-	h->i = 0;
-
-	s->data = h;
-	s->ops = &nullfs_dh_ops;
-	s->mode = FM_READDIR;
-
-	mutex_unlock(&d->lock);
-
 	return true;
-
-fail:
-	mutex_unlock(&d->lock);
-	if (h && h->items) free(h->items);
-	if (h) free(h);
-	return false;
 }
 
 bool nullfs_d_stat(fs_node_ptr n, stat_t *st) {
@@ -296,9 +240,7 @@ bool nullfs_d_stat(fs_node_ptr n, stat_t *st) {
 		| (d->fs->can_move ? FM_DMOVE : 0)
 		| (d->fs->can_delete ? FM_DDELETE : 0);
 
-	st->size = 0;
-	for (nullfs_item_t *i = d->items_list; i != 0; i = i->next)
-		st->size++;
+	st->size = hashtbl_count(d->items_idx);
 
 	mutex_unlock(&d->lock);
 
@@ -468,32 +410,45 @@ void nullfs_d_dispose(fs_node_ptr n) {
 	// nothing to do
 }
 
+bool nullfs_d_readdir(fs_node_ptr f, size_t ent_no, dirent_t *d) {
+	// Very nonefficient !!
 
-//   -- Directory handle --
+	nullfs_dir_t *h = (nullfs_dir_t*)f;
 
-bool nullfs_dh_readdir(fs_handle_ptr f, dirent_t *d) {
-	nullfs_dh_t *h = (nullfs_dh_t*)f;
+	mutex_lock(&h->lock);
 
-	int i = h->i;
-	if (i >= h->nitems) {
-		return false;
-	} else {
-		memcpy(d, &h->items[i], sizeof(dirent_t));
-		h->i++;
-		return true;
+	bool ok = false;
+	size_t idx = 0;
+	for (nullfs_item_t *i = h->items_list; i != 0; i = i->next) {
+		if (idx == ent_no) {
+			ok = true;
+
+			strncpy(d->name, i->name, DIR_MAX);
+			d->name[DIR_MAX-1] = 0;
+			if (i->ops->stat) {
+				i->ops->stat(i->data, &d->st);
+			} else {
+				// no stat operation : should we do something else ?
+				memset(&d->st, 0, sizeof(stat_t));
+			}
+
+			break;
+		}
+		idx++;
 	}
-}
 
-void nullfs_dh_close(fs_handle_ptr f) {
-	nullfs_dh_t *h = (nullfs_dh_t*)f;
+	mutex_unlock(&h->lock);
 
-	if (h->items) free(h->items);
-	free(h);
+	return ok;
+}
+
+void nullfs_d_close(fs_node_ptr f) {
+	// Nothing to do
 }
 
 //   -- File node --
 
-bool nullfs_f_open(fs_node_ptr n, int mode, fs_handle_t *s) {
+bool nullfs_f_open(fs_node_ptr n, int mode) {
 	nullfs_file_t *f = (nullfs_file_t*)n;
 
 	if (mode & ~f->ok_modes) return false;
@@ -510,10 +465,6 @@ bool nullfs_f_open(fs_node_ptr n, int mode, fs_handle_t *s) {
 		mutex_unlock(&f->lock);
 	}
 
-	s->mode = mode;
-	s->data = f;
-	s->ops = &nullfs_fh_ops;
-
 	return true;
 }
 
@@ -535,7 +486,7 @@ void nullfs_f_dispose(fs_node_ptr n) {
 
 //   -- File handle --
 
-static size_t nullfs_fh_read(fs_handle_ptr h, size_t offset, size_t len, char* buf) {
+static size_t nullfs_f_read(fs_node_ptr h, size_t offset, size_t len, char* buf) {
 	nullfs_file_t *f = (nullfs_file_t*)h;
 	mutex_lock(&f->lock);
 
@@ -552,7 +503,7 @@ end_read:
 	return ret;
 }
 
-static size_t nullfs_fh_write(fs_handle_ptr h, size_t offset, size_t len, const char* buf) {
+static size_t nullfs_f_write(fs_node_ptr h, size_t offset, size_t len, const char* buf) {
 	nullfs_file_t *f = (nullfs_file_t*)h;
 	mutex_lock(&f->lock);
 
@@ -581,7 +532,7 @@ end_write:
 	return ret;
 }
 
-static void nullfs_fh_close(fs_handle_ptr h) {
+static void nullfs_f_close(fs_node_ptr h) {
 	// nothing to do
 }
 
diff --git a/src/kernel/user/process.c b/src/kernel/user/process.c
index 4dea882..3f8da08 100644
--- a/src/kernel/user/process.c
+++ b/src/kernel/user/process.c
@@ -290,7 +290,7 @@ bool munmap(process_t *proc, void* addr) {
 
 		if (ent & PTE_PRESENT) {
 			if ((ent & PTE_DIRTY) && (r->mode & MM_WRITE) && r->file != 0) {
-				file_commit_page(r->file, it - r->addr + r->file_offset, proc->last_ran);
+				// TODO COMMIT PAGE!!
 			}
 			pd_unmap_page(it);
 			if (r->file != 0) {
@@ -343,7 +343,8 @@ static void proc_usermem_pf(void* p, registers_t *regs, void* addr) {
 		if (r->file == 0) {
 			frame = frame_alloc(1);
 		} else {
-			frame = file_get_page(r->file, addr - r->addr + r->file_offset);
+			PANIC("Not implemented mmap (AWFUL TODO)");
+			// Here we must get the page from the cache
 		}
 		if (frame == 0) {
 			free_some_memory();
diff --git a/src/kernel/user/syscall.c b/src/kernel/user/syscall.c
index 3def3b5..3041c6d 100644
--- a/src/kernel/user/syscall.c
+++ b/src/kernel/user/syscall.c
@@ -237,9 +237,9 @@ static uint32_t readdir_sc(sc_args_t args) {
 	fs_handle_t *h = proc_read_fd(current_process(), args.a);
 	if (h == 0) return false;
 
-	dirent_t *o = (dirent_t*)args.b;
+	dirent_t *o = (dirent_t*)args.c;
 	probe_for_write(o, sizeof(dirent_t));
-	return file_readdir(h, o);
+	return file_readdir(h, args.b, o);
 }
 
 static uint32_t stat_open_sc(sc_args_t args) {
diff --git a/src/kernel/user/vfs.c b/src/kernel/user/vfs.c
index 710326a..a02dc9b 100644
--- a/src/kernel/user/vfs.c
+++ b/src/kernel/user/vfs.c
@@ -420,12 +420,13 @@ fs_handle_t* fs_open(fs_t *fs, const char* file, int mode) {
 	fs_handle_t *h = (fs_handle_t*)malloc(sizeof(fs_handle_t));
 	if (h == 0) goto error;
 
+	bool open_ok = n->ops->open(n->data, mode);
+	if (!open_ok) goto error;
+
 	h->refs = 1;
 	h->fs = fs;
 	h->node = n;
-
-	bool open_ok = n->ops->open(n->data, mode, h);
-	if (!open_ok) goto error;
+	h->mode = mode;
 
 	// our reference to node n is transferred to the file handle
 	mutex_unlock(&n->lock);
@@ -446,7 +447,7 @@ void ref_file(fs_handle_t *file) {
 void unref_file(fs_handle_t *file) {
 	file->refs--;
 	if (file->refs == 0) {
-		file->ops->close(file->data);
+		file->node->ops->close(file->node->data);
 		unref_fs_node(file->node);
 		unref_fs(file->fs);
 		free(file);
@@ -460,17 +461,17 @@ int file_get_mode(fs_handle_t *f) {
 size_t file_read(fs_handle_t *f, size_t offset, size_t len, char* buf) {
 	if (!(f->mode & FM_READ)) return 0;
 
-	if (f->ops->read == 0) return 0;
+	if (f->node->ops->read == 0) return 0;
 
-	return f->ops->read(f->data, offset, len, buf);
+	return f->node->ops->read(f->node->data, offset, len, buf);
 }
 
 size_t file_write(fs_handle_t *f, size_t offset, size_t len, const char* buf) {
 	if (!(f->mode & FM_WRITE)) return 0;
 
-	if (f->ops->write == 0) return 0;
+	if (f->node->ops->write == 0) return 0;
 
-	return f->ops->write(f->data, offset, len, buf);
+	return f->node->ops->write(f->node->data, offset, len, buf);
 }
 
 bool file_stat(fs_handle_t *f, stat_t *st) {
@@ -480,27 +481,15 @@ bool file_stat(fs_handle_t *f, stat_t *st) {
 int file_ioctl(fs_handle_t *f, int command, void* data) {
 	if (!(f->mode & FM_IOCTL)) return -1;
 
-	if (f->ops->ioctl == 0) return -1;
+	if (f->node->ops->ioctl == 0) return -1;
 
-	return f->ops->ioctl(f->data, command, data);
+	return f->node->ops->ioctl(f->node->data, command, data);
 }
 
-bool file_readdir(fs_handle_t *f, dirent_t *d) {
+bool file_readdir(fs_handle_t *f, size_t ent_no, dirent_t *d) {
 	if (!(f->mode & FM_READDIR)) return 0;
 
-	return f->ops->readdir && f->ops->readdir(f->data, d);
-}
-
-uint32_t file_get_page(fs_handle_t *f, size_t offset) {
-	if (!(f->mode & FM_MMAP)) return 0;
-	ASSERT(f->ops->get_page != 0);
-	return f->ops->get_page(f->data, offset);
-}
-
-void file_commit_page(fs_handle_t *f, size_t offset, uint64_t time) {
-	if (!(f->mode & FM_MMAP)) return;
-	ASSERT(f->ops->commit_page != 0);
-	f->ops->commit_page(f->data, offset, time);
+	return f->node->ops->readdir && f->node->ops->readdir(f->node->data, ent_no, d);
 }
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/lib/include/syscall.h b/src/lib/include/syscall.h
index 246c84c..c26a805 100644
--- a/src/lib/include/syscall.h
+++ b/src/lib/include/syscall.h
@@ -32,7 +32,7 @@ fd_t open(const char* name, int mode);
 void close(fd_t file);
 size_t read(fd_t file, size_t offset, size_t len, char *buf);
 size_t write(fd_t file, size_t offset, size_t len, const char* buf);
-bool readdir(fd_t file, dirent_t *d);
+bool readdir(fd_t file, size_t ent_no, dirent_t *d);
 bool stat_open(fd_t file, stat_t *s);
 int ioctl(fd_t file, int command, void* data);
 int get_mode(fd_t file);
diff --git a/src/lib/libkogata/syscall.c b/src/lib/libkogata/syscall.c
index 88e9aa2..6f37c47 100644
--- a/src/lib/libkogata/syscall.c
+++ b/src/lib/libkogata/syscall.c
@@ -77,8 +77,8 @@ size_t read(fd_t file, size_t offset, size_t len, char *buf) {
 size_t write(fd_t file, size_t offset, size_t len, const char* buf) {
 	return call(SC_WRITE, file, offset, len, (uint32_t)buf, 0);
 }
-bool readdir(fd_t file, dirent_t *d) {
-	return call(SC_READDIR, file, (uint32_t)d, 0, 0, 0);
+bool readdir(fd_t file, size_t ent_no, dirent_t *d) {
+	return call(SC_READDIR, file, ent_no, (uint32_t)d, 0, 0);
 }
 bool stat_open(fd_t file, stat_t *s) {
 	return call(SC_STAT_OPEN, file, (uint32_t)s, 0, 0, 0);