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Added sys_mkdir and memfs_vnode_mkdir() functions. Untested but all implemented.

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This commit is contained in:
Bahadir Balban
2008-02-15 17:32:41 +00:00
parent 5de93f707c
commit 09bd001e1a
6 changed files with 221 additions and 56 deletions
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83
tasks/fs0/src/memfs/vnode.c
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@@ -204,6 +204,77 @@ int memfs_write_vnode(struct superblock *sb, struct vnode *v)
return 0;
}
int memfs_vnode_mkdir(struct vnode *v, char *dirname)
{
struct dentry *d, *parent = list_entry(v->dentries.next,
struct dentry, vref);
struct memfs_dentry *memfsd;
struct dentry *newd;
struct vnode *newv;
int err;
/*
* Precautions to prove that parent is the *only* dentry,
* since directories can't have multiple dentries associated
* with them.
*/
BUG_ON(list_empty(&v->dentries));
BUG_ON(parent->vref.next != &v->dentries);
BUG_ON(!vfs_isdir(v));
/* Populate the children */
if ((err = v->ops.readdir(v)) < 0)
return err;
/* Check there's no existing child with same name */
list_for_each_entry(d, &parent->children, child) {
/* Does the name exist as a child? */
if(d->ops.compare(d, dirname))
return -EEXIST;
}
/* Allocate a new vnode for the new directory */
if (IS_ERR(newv = v->sb->ops->alloc_vnode(v->sb)))
return (int)newv;
/* Initialise the vnode */
vfs_set_type(newv, S_IFDIR);
/* Get the next directory entry available on the parent vnode */
if (v->dirbuf.npages * PAGE_SIZE <= v->size)
return -ENOSPC;
memfsd = (struct memfs_dentry *)&v->dirbuf.buffer[v->size];
memfsd->offset = v->size;
memfsd->rlength = sizeof(*memfsd);
memfsd->inum = ((struct memfs_inode *)newv->inode)->inum;
strncpy((char *)memfsd->name, dirname, MEMFS_DNAME_MAX);
memfsd->name[MEMFS_DNAME_MAX - 1] = '\0';
/* Update parent vnode */
v->size += sizeof(*memfsd);
/* Allocate a new vfs dentry */
if (!(newd = vfs_alloc_dentry()))
return -ENOMEM;
/* Initialise it */
newd->ops = generic_dentry_operations;
newd->parent = parent;
newd->vnode = newv;
/* Associate dentry with its vnode */
list_add(&newd->vref, &newd->vnode->dentries);
/* Associate dentry with its parent */
list_add(&newd->child, &parent->children);
/* Add both vnode and dentry to their flat caches */
list_add(&newd->cache_list, &dentry_cache);
list_add(&newv->cache_list, &vnode_cache);
return 0;
}
/*
* Reads the vnode directory contents into vnode's buffer in a posix-compliant
* struct dirent format.
@@ -220,9 +291,13 @@ int memfs_vnode_readdir(struct vnode *v)
struct dentry *parent = list_entry(v->dentries.next,
struct dentry, vref);
/* Check directory type */
if (!vfs_isdir(v))
return -ENOTDIR;
/*
* Precautions to prove that parent is the *only* dentry,
* since directories can't have multiple dentries associated
* with them.
*/
BUG_ON(parent->vref.next != &v->dentries);
BUG_ON(!vfs_isdir(v));
/* If a buffer is there, it means the directory is already read */
if (v->dirbuf.buffer)
@@ -279,8 +354,10 @@ int memfs_vnode_readdir(struct vnode *v)
return 0;
}
struct vnode_ops memfs_vnode_operations = {
.readdir = memfs_vnode_readdir,
.mkdir = memfs_vnode_mkdir,
};
struct superblock_ops memfs_superblock_operations = {