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Some efforts to adding better support for readdir

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This commit is contained in:
Bahadir Balban
2008-02-14 12:08:21 +00:00
parent 60cce15a4d
commit 2440b5be61
8 changed files with 79 additions and 8 deletions
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2
tasks/fs0/src/init.c
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@@ -75,6 +75,8 @@ int initialise(void)
memfs_format_filesystem(rootdev_blocks);
INIT_LIST_HEAD(&vm_file_list);
INIT_LIST_HEAD(&vnode_cache);
INIT_LIST_HEAD(&dentry_cache);
/* Search for a filesystem on the root device */
BUG_ON(IS_ERR(root_sb = vfs_probe_filesystems(rootdev_blocks)));

3
tasks/fs0/src/syscalls.c
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@@ -91,6 +91,7 @@ int sys_read(l4id_t sender, int fd, void *buf, int count)
int sys_readdir(l4id_t sender, int fd, void *buf, int count)
{
struct vnode *v;
struct tcb *t;
/* Get the task */
BUG_ON(!(t = find_task(sender)));
@@ -104,7 +105,7 @@ int sys_readdir(l4id_t sender, int fd, void *buf, int count)
/* Simply read its contents */
v->ops.readdir(v, buf, count);
`
return 0;
}

41
tasks/fs0/src/vfs.c
View File

@@ -6,12 +6,49 @@
#include <fs.h>
#include <vfs.h>
struct vnode *vfs_lookup(struct superblock *sb, char *path)
struct list_head vnode_cache;
struct list_head dentry_cache;
/*
* Vnodes in the vnode cache have 2 keys. One is their dentry names, the other
* is their vnum. This one checks the vnode cache by the given vnum first.
* If nothing is found, it reads the vnode from disk into cache.
*/
struct vnode *vfs_lookup_byvnum(struct superblock *sb, unsigned long vnum)
{
struct vnode *v;
/* Check the vnode cache by vnum */
list_for_each_entry(v, vnode_cache, cache_list)
if (v->vnum == vnum)
return v;
/* Otherwise ask the filesystem:
* TODO:
* vfs_alloc_vnode() -> This should also add the empty vnode to vnode cache.
* read_vnode() -> read it from filesystem.
* return what's read.
*/
}
/*
* Vnodes in the vnode cache have 2 keys. One is their dentry name, the
* other is their vnum. This one checks the vnode cache by the path first.
* If nothing is found, it reads the vnode from disk into the cache.
*/
struct vnode *vfs_lookup_bypath(struct superblock *sb, char *path)
{
/* If it's just / we already got it. */
if (!strcmp(path, "/"))
return sb->root;
/* TODO: Check the vnode cache by path component
*
* This should split the path into components and compare
* each of them with each vnode's dentry list.
*/
/* It's not in the cache, look it up from filesystem. */
return sb->root->ops.lookup(sb->root, path);
}
@@ -28,7 +65,7 @@ struct vfs_mountpoint vfs_root;
int vfs_mount_root(struct superblock *sb)
{
/* Lookup the root vnode of this superblock */
vfs_root.pivot = vfs_lookup(sb, "/");
vfs_root.pivot = vfs_lookup_bypath(sb, "/");
vfs_root.sb = sb;
return 0;