Added resolving of current directory in case lookup starts from current dir.

tasks/fs0/include/fs.h

@@ -22,7 +22,7 @@ struct superblock;
 struct vnode;
 
 struct dentry_ops {
-	int (*compare)(struct dentry *d, char *n);
+	int (*compare)(struct dentry *d, const char *n);
 };
 
 /* Operations that work on file content */
@@ -47,13 +47,13 @@ struct file_ops {
 struct vnode_ops {
 	vnode_op_t create;
 	struct vnode *(*lookup)(struct vnode *root, struct pathdata *pdata,
-				char *component);
+				const char *component);
 	int (*readdir)(struct vnode *v);
 	int (*filldir)(void *buf, struct vnode *v, int count);
 	vnode_op_t link;
 	vnode_op_t unlink;
-	int (*mkdir)(struct vnode *parent, char *name);
-	int (*mknod)(struct vnode *parent, char *name, unsigned int mode);
+	int (*mkdir)(struct vnode *parent, const char *name);
+	int (*mknod)(struct vnode *parent, const char *name, unsigned int mode);
 	vnode_op_t rmdir;
 	vnode_op_t rename;
 	vnode_op_t getattr;

tasks/fs0/include/path.h

@@ -7,6 +7,7 @@
 #define __PATH_H__
 
 #include <l4/lib/list.h>
+#include <task.h>
 
 /*
  * FIXME:
@@ -21,13 +22,13 @@
 
 struct pathdata {
 	struct list_head list;
-	struct tcb *task;
+	struct vnode *vstart;
 	int root;
 };
 
 struct pathcomp {
 	struct list_head list;
-	char *str;
+	const char *str;
 };
 
 struct pathdata *pathdata_parse(const char *pathname, char *pathbuf,
@@ -35,7 +36,7 @@ struct pathdata *pathdata_parse(const char *pathname, char *pathbuf,
 void pathdata_destroy(struct pathdata *p);
 
 /* Destructive, i.e. unlinks those components from list */
-char *pathdata_next_component(struct pathdata *pdata);
-char *pathdata_last_component(struct pathdata *pdata);
+const char *pathdata_next_component(struct pathdata *pdata);
+const char *pathdata_last_component(struct pathdata *pdata);
 
 #endif /* __PATH_H__ */

tasks/fs0/include/vfs.h

@@ -83,7 +83,7 @@ extern struct vfs_mountpoint vfs_root;
 
 int vfs_mount_root(struct superblock *sb);
 struct vnode *generic_vnode_lookup(struct vnode *thisnode, struct pathdata *p,
-				   char *component);
+				   const char *component);
 struct vnode *vfs_lookup_bypath(struct pathdata *p);
 struct vnode *vfs_lookup_byvnum(struct superblock *sb, unsigned long vnum);
 

tasks/fs0/src/lookup.c

@@ -20,7 +20,7 @@ struct vnode *lookup_dentry_children(struct dentry *parentdir,
 {
 	struct dentry *childdir;
 	struct vnode *v;
-	char *component = pathdata_next_component(pdata);
+	const char *component = pathdata_next_component(pdata);
 
 	list_for_each_entry(childdir, &parentdir->children, child)
 		if (IS_ERR(v = childdir->vnode->ops.lookup(childdir->vnode,
@@ -40,7 +40,7 @@ struct vnode *lookup_dentry_children(struct dentry *parentdir,
 /* Lookup, recursive, assuming single-mountpoint */
 struct vnode *generic_vnode_lookup(struct vnode *thisnode,
 				   struct pathdata *pdata,
-				   char *component)
+				   const char *component)
 {
 	struct dentry *d;
 	struct vnode *found;
@@ -76,7 +76,7 @@ struct vnode *generic_vnode_lookup(struct vnode *thisnode,
 	return PTR_ERR(-ENOENT);
 }
 
-int generic_dentry_compare(struct dentry *d, char *name)
+int generic_dentry_compare(struct dentry *d, const char *name)
 {
 	if (!strcmp(d->name, name) || !strcmp(name, VFS_STR_CURDIR))
 		return 1;

tasks/fs0/src/memfs/vnode.c

@@ -210,7 +210,7 @@ int memfs_write_vnode(struct superblock *sb, struct vnode *v)
  * Creates ordinary files and directories at the moment. In the future,
  * other file types will be added.
  */
-int memfs_vnode_mknod(struct vnode *v, char *dirname, unsigned int mode)
+int memfs_vnode_mknod(struct vnode *v, const char *dirname, unsigned int mode)
 {
 	struct dentry *d, *parent = list_entry(v->dentries.next,
 					       struct dentry, vref);

tasks/fs0/src/path.c

@@ -10,11 +10,13 @@
 #include <lib/malloc.h>
 #include <path.h>
 #include <stdio.h>
+#include <fs.h>
+#include <task.h>
 
-char *pathdata_next_component(struct pathdata *pdata)
+const char *pathdata_next_component(struct pathdata *pdata)
 {
 	struct pathcomp *p, *n;
-	char *pathstr;
+	const char *pathstr;
 
 	list_for_each_entry_safe(p, n, &pdata->list, list) {
 		list_del(&p->list);
@@ -26,10 +28,10 @@ char *pathdata_next_component(struct pathdata *pdata)
 }
 
 /* Check there's at least one element, unlink and return the last element */
-char *pathdata_last_component(struct pathdata *pdata)
+const char *pathdata_last_component(struct pathdata *pdata)
 {
 	struct pathcomp *p;
-	char *pathstr;
+	const char *pathstr;
 
 	if (!list_empty(&pdata->list)) {
 		p = list_entry(pdata->list.prev, struct pathcomp, list);
@@ -77,9 +79,8 @@ struct pathdata *pathdata_parse(const char *pathname,
 	/* Initialise pathdata */
 	INIT_LIST_HEAD(&pdata->list);
 	strcpy(pathbuf, pathname);
-	pdata->task = task;
 
-	/* Handle root if there's a root */
+	/* First component is root if there's a root */
 	if (pathname[0] == VFS_CHAR_SEP) {
 		if (!(comp = kzalloc(sizeof(*comp)))) {
 			kfree(pdata);
@@ -88,19 +89,47 @@ struct pathdata *pathdata_parse(const char *pathname,
 		INIT_LIST_HEAD(&comp->list);
 		comp->str = VFS_STR_ROOTDIR;
 		list_add_tail(&comp->list, &pdata->list);
-		pdata->root = 1;
+
+		/* Lookup start vnode is root vnode */
+		pdata->vstart = task->rootdir;
+
+	/* Otherwise start from current directory */
+	} else {
+		struct dentry *curdir;
+
+		if (!(comp = kzalloc(sizeof(*comp)))) {
+			kfree(pdata);
+			return PTR_ERR(-ENOMEM);
+		}
+		INIT_LIST_HEAD(&comp->list);
+
+		/* Get current dentry for this task */
+		curdir = list_entry(task->curdir->dentries.next,
+				    struct dentry, vref);
+
+		/* Use its name in path component */
+		comp->str = curdir->name;
+		list_add_tail(&comp->list, &pdata->list);
+
+		/* Lookup start vnode is current dir vnode */
+		pdata->vstart = task->curdir;
 	}
 
 	/* Add every other path component */
 	str = splitpath(&pathbuf, VFS_CHAR_SEP);
 	while(*str) {
-		if (!(comp = kzalloc(sizeof(*comp)))) {
-			pathdata_destroy(pdata);
-			return PTR_ERR(-ENOMEM);
+		/* Any curdir components in path are ignored. */
+		if (!strcmp(str, VFS_STR_CURDIR)) {
+			;
+		} else {
+			if (!(comp = kzalloc(sizeof(*comp)))) {
+				pathdata_destroy(pdata);
+				return PTR_ERR(-ENOMEM);
+			}
+			INIT_LIST_HEAD(&comp->list);
+			comp->str = str;
+			list_add_tail(&comp->list, &pdata->list);
 		}
-		INIT_LIST_HEAD(&comp->list);
-		comp->str = str;
-		list_add_tail(&comp->list, &pdata->list);
 
 		/* Next component */
 		str = splitpath(&pathbuf, VFS_CHAR_SEP);

tasks/fs0/src/syscalls.c

@@ -61,7 +61,7 @@ void print_vnode(struct vnode *v)
 int vfs_create(struct tcb *task, struct pathdata *pdata, unsigned int mode)
 {
 	struct vnode *vparent;
-	char *nodename;
+	const char *nodename;
 	int err;
 
 	/* The last component is to be created */
@@ -325,7 +325,7 @@ int sys_readdir(l4id_t sender, int fd, void *buf, int count)
 	if (count < dirent_size)
 		return 0;
 
-	fill_dirent(buf, v->vnum, nbytes, ".");
+	fill_dirent(buf, v->vnum, nbytes, VFS_STR_CURDIR);
 	nbytes += dirent_size;
 	buf += dirent_size;
 	count -= dirent_size;
@@ -333,7 +333,7 @@ int sys_readdir(l4id_t sender, int fd, void *buf, int count)
 	if (count < dirent_size)
 		return 0;
 
-	fill_dirent(buf, d->parent->vnode->vnum, nbytes, "..");
+	fill_dirent(buf, d->parent->vnode->vnum, nbytes, VFS_STR_PARDIR);
 	nbytes += dirent_size;
 	buf += dirent_size;
 	count -= dirent_size;

tasks/fs0/src/vfs.c

@@ -60,21 +60,14 @@ struct vnode *vfs_lookup_byvnum(struct superblock *sb, unsigned long vnum)
  */
 struct vnode *vfs_lookup_bypath(struct pathdata *pdata)
 {
-	struct vnode *vstart;
-	char *firstcomp;
-
-	/* Do we start from root or curdir? */
-	if (pdata->root)
-		vstart = pdata->task->rootdir;
-	else
-		vstart = pdata->task->curdir;
+	const char *firstcomp;
 
 	/*
 	 * This does vfs cache + fs lookup.
 	 */
 	BUG_ON(list_empty(&pdata->list));
        	firstcomp = pathdata_next_component(pdata);
-	return vstart->ops.lookup(vstart, pdata, firstcomp);
+	return pdata->vstart->ops.lookup(pdata->vstart, pdata, firstcomp);
 }
 
 int vfs_mount_root(struct superblock *sb)