Added sys_stat, sys_fstat and their libposix glue.

tasks/fs0/include/stat.h

@@ -62,4 +62,21 @@
 #define O_NOATIME	01000000
 #define O_NDELAY	O_NONBLOCK
 
+/*
+ * Internal codezero-specific stat structure.
+ * This is converted to posix stat in userspace
+ */
+struct kstat {
+	u64 vnum;
+	u32 mode;
+	int links;
+	u16 uid;
+	u16 gid;
+	u64 size;
+	int blksize;
+	u64 atime;
+	u64 mtime;
+	u64 ctime;
+};
+
 #endif /* __FS0_STAT_H__ */

tasks/fs0/include/task.h

@@ -10,7 +10,7 @@
 
 #define __TASKNAME__			__VFSNAME__
 
-#define TASK_OFILES_MAX			32
+#define TASK_FILES_MAX			32
 
 /* Thread control block, fs0 portion */
 struct tcb {
@@ -18,7 +18,7 @@ struct tcb {
 	unsigned long utcb_address;
 	int utcb_mapped;		/* Set if we mapped their utcb */
 	struct list_head list;
-	int fd[TASK_OFILES_MAX];
+	int fd[TASK_FILES_MAX];
 	struct id_pool *fdpool;
 	struct vnode *curdir;
 	struct vnode *rootdir;

tasks/fs0/src/syscalls.c

@@ -221,6 +221,85 @@ int sys_chdir(l4id_t sender, const char *pathname)
 	return 0;
 }
 
+void fill_kstat(struct vnode *v, struct kstat *ks)
+{
+	ks->vnum = (u64)v->vnum;
+	ks->mode = v->mode;
+	ks->links = v->links;
+	ks->uid = v->owner & 0xFFFF;
+	ks->gid = (v->owner >> 16) & 0xFFFF;
+	ks->size = v->size;
+	ks->blksize = v->sb->blocksize;
+	ks->atime = v->atime;
+	ks->mtime = v->mtime;
+	ks->ctime = v->ctime;
+}
+
+int sys_fstat(l4id_t sender, int fd, void *statbuf)
+{
+	struct vnode *v;
+	struct tcb *task;
+	unsigned long vnum;
+	int retval;
+
+	/* Get the task */
+	BUG_ON(!(task = find_task(sender)));
+
+	/* Get the vnum */
+	if (fd < 0 || fd > TASK_FILES_MAX) {
+		l4_ipc_return(-EINVAL);
+		return 0;
+	}
+	vnum = task->fd[fd];
+
+	/* Lookup vnode */
+	if (!(v = vfs_lookup_byvnum(vfs_root.pivot->sb, vnum))) {
+		retval = -EINVAL; /* No such vnode */
+		return 0;
+	}
+
+	/* Fill in the c0-style stat structure */
+	fill_kstat(v, statbuf);
+
+	l4_ipc_return(0);
+	return 0;
+}
+
+/*
+ * Returns codezero-style stat structure which in turn is
+ * converted to posix style stat structure via the libposix
+ * library in userspace.
+ */
+int sys_stat(l4id_t sender, const char *pathname, void *statbuf)
+{
+	struct vnode *v;
+	struct tcb *task;
+	struct pathdata *pdata;
+
+	/* Get the task */
+	BUG_ON(!(task = find_task(sender)));
+
+	/* Parse path data */
+	if (IS_ERR(pdata = pathdata_parse(pathname,
+					  alloca(strlen(pathname) + 1),
+					  task))) {
+		l4_ipc_return((int)pdata);
+		return 0;
+	}
+
+	/* Get the vnode */
+	if (IS_ERR(v = vfs_lookup_bypath(pdata))) {
+		l4_ipc_return((int)v);
+		return 0;
+	}
+
+	/* Fill in the c0-style stat structure */
+	fill_kstat(v, statbuf);
+
+	l4_ipc_return(0);
+	return 0;
+}
+
 /*
  * Note this can be solely called by the pager and is not the posix read call.
  * That call is in the pager. This merely supplies the pages the pager needs
@@ -387,7 +466,7 @@ int sys_readdir(l4id_t sender, int fd, void *buf, int count)
 		return 0;
 	}
 
-	if (fd < 0 || fd > TASK_OFILES_MAX) {
+	if (fd < 0 || fd > TASK_FILES_MAX) {
 	       l4_ipc_return(-EBADF);
 	       return 0;
 	}

tasks/fs0/src/task.c

@@ -115,7 +115,7 @@ struct tcb *create_tcb(void)
 	if (!(t = kmalloc(sizeof(*t))))
 		return PTR_ERR(-ENOMEM);
 
-	t->fdpool = id_pool_new_init(TASK_OFILES_MAX);
+	t->fdpool = id_pool_new_init(TASK_FILES_MAX);
 	INIT_LIST_HEAD(&t->list);
 	list_add_tail(&t->list, &tcb_head.list);
 	tcb_head.total++;