/* Removes any entry for NAME in DIR.
Returns true if successful, false on failure,
which occurs only if there is no file with the given NAME. */
bool
dir_remove (struct dir *dir, const char *name)
{
struct dir_entry e;
struct inode *inode = NULL;
bool success = false;
off_t ofs;
ASSERT (dir != NULL);
ASSERT (name != NULL);
/* Find directory entry. */
if (!lookup (dir, name, &e, &ofs))
goto done;
/* Open inode. */
inode = inode_open (e.inode_sector);
if (inode == NULL)
goto done;
/* Erase directory entry. */
e.in_use = false;
if (inode_write_at (dir->inode, &e, sizeof e, ofs) != sizeof e)
goto done;
/* Remove inode. */
inode_remove (inode);
success = true;
done:
inode_close (inode);
return success;
}
int unregister_blockdriver(FAR const char *path)
{
int ret;
inode_semtake();
ret = inode_remove(path);
inode_semgive();
return ret;
}
/* Removes any entry for NAME in DIR.
Returns true if successful, false on failure,
which occurs only if there is no file with the given NAME. */
bool
dir_remove (struct dir *dir, const char *name)
{
struct dir_entry e;
struct inode *inode = NULL;
bool success = false;
off_t ofs;
ASSERT (dir != NULL);
ASSERT (name != NULL);
//lock the directory for the rest of the lookup operation
inode_lock(dir->inode);
name = getfilename(name);
/* Find directory entry. */
if (!lookup (dir, name, &e, &ofs))
goto done;
/* Open inode. */
inode = inode_open (e.inode_sector);
if (inode == NULL)
goto done;
//if it is still open don't allow deletion
if(inode_type(inode) == FILE_DIR) {
//is file in use?
if(inode_opencnt(inode) > 1)
goto done;
char * temp = (char *)malloc(sizeof(char) * (NAME_MAX + 1) );
struct dir * dirtemp = dir_open(inode);
//is dir empty?
if (dir_readdir(dirtemp,temp)) {
free(temp);
dir_close(dirtemp);
goto done;
}
free(temp);
dir_close(dirtemp);
}
/* Erase directory entry. */
e.in_use = false;
if (inode_write_at (dir->inode, &e, sizeof e, ofs) != sizeof e)
goto done;
/* Remove inode. */
inode_remove (inode);
success = true;
done:
//unlock the directory
inode_unlock(dir->inode);
inode_close (inode);
return success;
}
/* Deletes NAME from DIR.
Returns true if successful, false on failure,
which occurs only if there is no file with the given NAME. */
bool
dir_remove (struct dir *dir, const char *name)
{
struct dir_entry e;
struct inode *inode = NULL;
bool success = false;
off_t ofs;
ASSERT (dir != NULL);
ASSERT (name != NULL);
lock_acquire (&dir->l);
/* Find directory entry. */
if (!lookup (dir, name, &e, &ofs))
goto done;
/* Open inode. */
inode = inode_open (e.inode_sector);
if (inode == NULL)
goto done;
/* If directory, make sure it's empty */
if (inode_is_directory (inode))
{
struct dir *inner = dir_open (inode_open (e.inode_sector));
int size = dir_size (inner);
dir_close (inner);
if (size != 0)
goto done;
}
/* Erase directory entry. */
e.in_use = false;
if (inode_write_at (dir->inode, &e, sizeof e, ofs) != sizeof e)
goto done;
/* Remove inode. */
success = inode_remove (inode);
done:
lock_release (&dir->l);
inode_close (inode);
return success;
}
/* Removes any entry for NAME in DIR.
Returns true if successful, false on failure,
which occurs only if there is no file with the given NAME. */
bool
dir_remove (struct file *dir, const char *name)
{
ASSERT (file_is_dir (dir));
struct dir_entry e;
struct inode *inode = NULL;
bool success = false;
off_t ofs;
int sector;
ASSERT (dir != NULL);
ASSERT (name != NULL);
bool locked = file_lock (dir);
/* Find directory entry. */
if ((sector = lookup (dir, name, &ofs, &e)) < 0)
goto done;
/* Open inode. */
inode = inode_open (sector);
if (inode == NULL)
goto done;
/* Erase directory entry. */
e.in_use = false;
if (inode_write_at (dir->inode, &e, sizeof e, ofs) != sizeof e)
goto done;
/* Remove inode. */
inode_remove (inode);
success = true;
done:
if (locked) file_unlock (dir);
if (inode) inode_close (inode);
return success;
}
int unlink(FAR const char *pathname)
{
FAR struct inode *inode;
const char *relpath = NULL;
int errcode;
int ret;
/* Get an inode for this file */
inode = inode_find(pathname, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Check if the inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
{
/* Perform the unlink operation using the relative path at the
* mountpoint.
*/
if (inode->u.i_mops->unlink)
{
ret = inode->u.i_mops->unlink(inode, relpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_inode;
}
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If this is a "dangling" pseudo-file node (i.e., it has operations) then rm
* should remove the node.
*/
if (!INODE_IS_SPECIAL(inode) && inode->u.i_ops)
{
/* If this is a pseudo-file node (i.e., it has no operations)
* then rmdir should remove the node.
*/
if (inode->u.i_ops)
{
inode_semtake();
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
inode_semgive();
goto errout_with_inode;
}
/* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all
* of the references to to the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = EISDIR;
goto errout_with_inode;
}
}
else
#endif
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Successfully unlinked */
inode_release(inode);
return OK;
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
return ERROR;
}
int sem_unlink(FAR const char *name)
{
FAR struct inode *inode;
FAR const char *relpath = NULL;
char fullpath[MAX_SEMPATH];
int errcode;
int ret;
/* Get the full path to the semaphore */
snprintf(fullpath, MAX_SEMPATH, CONFIG_FS_NAMED_SEMPATH "/%s", name);
/* Get the inode for this semaphore. */
sched_lock();
inode = inode_find(fullpath, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
/* Verify that what we found is, indeed, a semaphore */
if (!INODE_IS_NAMEDSEM(inode))
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
inode_semtake();
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
goto errout_with_semaphore;
}
/* Remove the old inode from the tree. Because we hold a reference count
* on the inode, it will not be deleted now. This will set the
* FSNODEFLAG_DELETED bit in the inode flags.
*/
ret = inode_remove(fullpath);
/* inode_remove() should always fail with -EBUSY because we hae a reference
* on the inode. -EBUSY means taht the inode was, indeed, unlinked but
* thatis could not be freed because there are refrences.
*/
DEBUGASSERT(ret >= 0 || ret == -EBUSY);
UNUSED(ret);
/* Now we do not release the reference count in the normal way (by calling
* inode release. Rather, we call sem_close(). sem_close will decrement
* the reference count on the inode. But it will also free the semaphore
* if that reference count decrements to zero. Since we hold one reference,
* that can only occur if the semaphore is not in-use.
*/
inode_semgive();
ret = sem_close((FAR sem_t *)inode->u.i_nsem);
sched_unlock();
return ret;
errout_with_semaphore:
inode_semgive();
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
sched_unlock();
return ERROR;
}
int mount(const char *source, const char *target,
const char *filesystemtype, unsigned long mountflags,
const void *data)
{
#if defined(BDFS_SUPPORT) || defined(NONBDFS_SUPPORT)
#ifdef BDFS_SUPPORT
FAR struct inode *blkdrvr_inode = NULL;
#endif
FAR struct inode *mountpt_inode;
FAR const struct mountpt_operations *mops;
void *fshandle;
int errcode;
int status;
/* Verify required pointer arguments */
DEBUGASSERT(target && filesystemtype);
/* Find the specified filesystem. Try the block driver file systems first */
#ifdef BDFS_SUPPORT
if ((mops = mount_findfs(g_bdfsmap, filesystemtype)) != NULL)
{
/* Make sure that a block driver argument was provided */
DEBUGASSERT(source);
/* Find the block driver */
status = find_blockdriver(source, mountflags, &blkdrvr_inode);
if (status < 0)
{
fdbg("Failed to find block driver %s\n", source);
errcode = -status;
goto errout;
}
}
else
#endif /* BDFS_SUPPORT */
#ifdef NONBDFS_SUPPORT
if ((mops = mount_findfs(g_nonbdfsmap, filesystemtype)) != NULL)
{
}
else
#endif /* NONBDFS_SUPPORT */
{
fdbg("Failed to find file system %s\n", filesystemtype);
errcode = ENODEV;
goto errout;
}
/* Insert a dummy node -- we need to hold the inode semaphore
* to do this because we will have a momentarily bad structure.
*/
inode_semtake();
mountpt_inode = inode_reserve(target);
if (!mountpt_inode)
{
/* inode_reserve can fail for a couple of reasons, but the most likely
* one is that the inode already exists.
*/
fdbg("Failed to reserve inode\n");
errcode = EBUSY;
goto errout_with_semaphore;
}
/* Bind the block driver to an instance of the file system. The file
* system returns a reference to some opaque, fs-dependent structure
* that encapsulates this binding.
*/
if (!mops->bind)
{
/* The filesystem does not support the bind operation ??? */
fdbg("Filesystem does not support bind\n");
errcode = EINVAL;
goto errout_with_mountpt;
}
/* Increment reference count for the reference we pass to the file system */
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
blkdrvr_inode->i_crefs++;
}
#endif
/* On failure, the bind method returns -errorcode */
#ifdef BDFS_SUPPORT
status = mops->bind(blkdrvr_inode, data, &fshandle);
#else
status = mops->bind(NULL, data, &fshandle);
#endif
if (status != 0)
{
/* The inode is unhappy with the blkdrvr for some reason. Back out
* the count for the reference we failed to pass and exit with an
* error.
*/
fdbg("Bind method failed: %d\n", status);
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
blkdrvr_inode->i_crefs--;
}
#endif
errcode = -status;
goto errout_with_mountpt;
}
/* We have it, now populate it with driver specific information. */
INODE_SET_MOUNTPT(mountpt_inode);
mountpt_inode->u.i_mops = mops;
#ifdef CONFIG_FILE_MODE
mountpt_inode->i_mode = mode;
#endif
mountpt_inode->i_private = fshandle;
inode_semgive();
/* We can release our reference to the blkdrver_inode, if the filesystem
* wants to retain the blockdriver inode (which it should), then it must
* have called inode_addref(). There is one reference on mountpt_inode
* that will persist until umount() is called.
*/
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
return OK;
/* A lot of goto's! But they make the error handling much simpler */
errout_with_mountpt:
mountpt_inode->i_crefs = 0;
inode_remove(target);
inode_semgive();
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
inode_release(mountpt_inode);
goto errout;
errout_with_semaphore:
inode_semgive();
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
errout:
errno = errcode;
return ERROR;
#else
fdbg("No filesystems enabled\n");
ernno = ENOSYS;
return error;
#endif /* BDFS_SUPPORT || NONBDFS_SUPPORT */
}
/* Creates a file named NAME with the given INITIAL_SIZE.
Returns true if successful, false otherwise.
Fails if a file named NAME already exists,
or if internal memory allocation fails. */
static bool
_filesys_create (const char *full_path, off_t initial_size,
bool is_dir)
{
block_sector_t cwd = thread_current ()->cwd_sector;
bool found = true;
if (cwd != (block_sector_t) ROOT_DIR_SECTOR)
{
struct inode *curr = NULL;
curr = inode_open (cwd);
struct dir *p;
p = dir_open (inode_open (curr->data.parent_dir_sector));
struct dir_entry e;
size_t ofs;
ASSERT (p != NULL);
found = false;
for (ofs = 0;
inode_read_at (p->inode, &e, sizeof e, ofs) == sizeof e;
ofs += sizeof e)
{
if (e.inode_sector == cwd && e.in_use)
{
found = true;
break;
}
}
}
if (!found)
return false;
char leaf_name[NAME_MAX + 1];
if (!dir_get_leaf_name (full_path, leaf_name))
return false;
struct dir *parent_dir = dir_get_parent_dir (full_path);
if (parent_dir == NULL)
return false;
block_sector_t inode_sector = 0;
if (!free_map_allocate_one (&inode_sector))
{
dir_close (parent_dir);
return false;
}
bool success = is_dir? dir_create (inode_sector, BLOCK_SECTOR_SIZE /
sizeof (struct dir_entry)) :
inode_create (inode_sector, initial_size);
if (!success)
{
free_map_release (inode_sector, 1);
dir_close (parent_dir);
return false;
}
if (!dir_add (parent_dir, leaf_name, inode_sector))
{
inode_remove (inode_open (inode_sector));
free_map_release (inode_sector, 1);
dir_close (parent_dir);
return false;
}
dir_close (parent_dir);
return true;
}
int rename(FAR const char *oldpath, FAR const char *newpath)
{
FAR struct inode *oldinode;
FAR struct inode *newinode;
const char *oldrelpath = NULL;
#ifndef CONFIG_DISABLE_MOUNTPOINT
const char *newrelpath = NULL;
#endif
int errcode;
int ret;
/* Ignore paths that are interpreted as the root directory which has no name
* and cannot be moved
*/
if (!oldpath || *oldpath == '\0' || oldpath[0] != '/' ||
!newpath || *newpath == '\0' || newpath[0] != '/')
{
return -EINVAL;
}
/* Get an inode that includes the oldpath */
oldinode = inode_find(oldpath, &oldrelpath);
if (!oldinode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Verify that the old inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(oldinode) && oldinode->u.i_mops)
{
/* Get an inode for the new relpath -- it should like on the same
* mountpoint
*/
newinode = inode_find(newpath, &newrelpath);
if (!newinode)
{
/* There is no mountpoint that includes in this path */
errcode = ENOENT;
goto errout_with_oldinode;
}
/* Verify that the two paths lie on the same mountpoint inode */
if (oldinode != newinode)
{
errcode = EXDEV;
goto errout_with_newinode;
}
/* Perform the rename operation using the relative paths
* at the common mountpoint.
*/
if (oldinode->u.i_mops->rename)
{
ret = oldinode->u.i_mops->rename(oldinode, oldrelpath, newrelpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_newinode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_newinode;
}
/* Successfully renamed */
inode_release(newinode);
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
{
/* Create a new, empty inode at the destination location.
* NOTE that the new inode will be created with a reference count
* of zero.
*/
inode_semtake();
ret = inode_reserve(newpath, &newinode);
if (ret < 0)
{
/* It is an error if a node at newpath already exists in the tree
* OR if we fail to allocate memory for the new inode (and possibly
* any new intermediate path segments).
*/
inode_semgive();
errcode = EEXIST;
goto errout_with_oldinode;
}
/* Copy the inode state from the old inode to the newly allocated inode */
newinode->i_child = oldinode->i_child; /* Link to lower level inode */
newinode->i_flags = oldinode->i_flags; /* Flags for inode */
newinode->u.i_ops = oldinode->u.i_ops; /* Inode operations */
#ifdef CONFIG_FILE_MODE
newinode->i_mode = oldinode->i_mode; /* Access mode flags */
#endif
newinode->i_private = oldinode->i_private; /* Per inode driver private data */
/* We now have two copies of the inode. One with a reference count of
* zero (the new one), and one that may have multiple references
* including one by this logic (the old one)
*
* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all of
* the references to to the inode have been released (perhaps when
* inode_release() is called below). inode_remove() should return
* -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(oldpath);
if (ret < 0 && ret != -EBUSY)
{
/* Remove the new node we just recreated */
(void)inode_remove(newpath);
inode_semgive();
errcode = -ret;
goto errout_with_oldinode;
}
/* Remove all of the children from the unlinked inode */
oldinode->i_child = NULL;
inode_semgive();
}
#else
{
errcode = ENXIO;
goto errout;
}
#endif
/* Successfully renamed */
inode_release(oldinode);
return OK;
#ifndef CONFIG_DISABLE_MOUNTPOINT
errout_with_newinode:
inode_release(newinode);
#endif
errout_with_oldinode:
inode_release(oldinode);
errout:
set_errno(errcode);
return ERROR;
}
int umount(const char *target)
{
FAR struct inode *mountpt_inode;
FAR struct inode *blkdrvr_inode = NULL;
int errcode = OK;
int status;
/* Verify required pointer arguments */
if (!target)
{
errcode = EFAULT;
goto errout;
}
/* Find the mountpt */
mountpt_inode = inode_find(target, NULL);
if (!mountpt_inode)
{
errcode = ENOENT;
goto errout;
}
/* Verify that the inode is a mountpoint */
if (!INODE_IS_MOUNTPT(mountpt_inode))
{
errcode = EINVAL;
goto errout_with_mountpt;
}
/* Unbind the block driver from the file system (destroying any fs
* private data.
*/
if (!mountpt_inode->u.i_mops->unbind)
{
/* The filesystem does not support the unbind operation ??? */
errcode = EINVAL;
goto errout_with_mountpt;
}
/* The unbind method returns the number of references to the
* filesystem (i.e., open files), zero if the unbind was
* performed, or a negated error code on a failure.
*/
inode_semtake(); /* Hold the semaphore through the unbind logic */
status = mountpt_inode->u.i_mops->unbind( mountpt_inode->i_private, &blkdrvr_inode);
if (status < 0)
{
/* The inode is unhappy with the blkdrvr for some reason */
errcode = -status;
goto errout_with_semaphore;
}
else if (status > 0)
{
errcode = EBUSY;
goto errout_with_semaphore;
}
/* Successfully unbound */
mountpt_inode->i_private = NULL;
/* Successfully unbound, remove the mountpoint inode from
* the inode tree. The inode will not be deleted yet because
* there is still at least reference on it (from the mount)
*/
status = inode_remove(target);
inode_semgive();
/* The return value of -EBUSY is normal (in fact, it should
* not be OK)
*/
if (status != OK && status != -EBUSY)
{
errcode = -status;
goto errout_with_mountpt;
}
/* Release the mountpoint inode and any block driver inode
* returned by the file system unbind above. This should cause
* the inode to be deleted (unless there are other references)
*/
inode_release(mountpt_inode);
/* Did the unbind method return a contained block driver */
if (blkdrvr_inode)
{
inode_release(blkdrvr_inode);
}
return OK;
/* A lot of goto's! But they make the error handling much simpler */
errout_with_semaphore:
inode_semgive();
errout_with_mountpt:
inode_release(mountpt_inode);
if (blkdrvr_inode)
{
inode_release(blkdrvr_inode);
}
errout:
set_errno(errcode);
return ERROR;
}
int umount2(FAR const char *target, unsigned int flags)
{
FAR struct inode *mountpt_inode;
FAR struct inode *blkdrvr_inode = NULL;
struct inode_search_s desc;
int errcode = OK;
int ret;
/* Verify required pointer arguments */
if (!target)
{
errcode = EFAULT;
goto errout;
}
/* Find the mountpt */
SETUP_SEARCH(&desc, target, false);
ret = inode_find(&desc);
if (ret < 0)
{
errcode = ENOENT;
goto errout_with_search;
}
/* Get the search results */
mountpt_inode = desc.node;
DEBUGASSERT(mountpt_inode != NULL);
/* Verify that the inode is a mountpoint */
if (!INODE_IS_MOUNTPT(mountpt_inode))
{
errcode = EINVAL;
goto errout_with_mountpt;
}
/* Unbind the block driver from the file system (destroying any fs
* private data.
*/
if (!mountpt_inode->u.i_mops->unbind)
{
/* The filesystem does not support the unbind operation ??? */
errcode = EINVAL;
goto errout_with_mountpt;
}
/* The unbind method returns the number of references to the
* filesystem (i.e., open files), zero if the unbind was
* performed, or a negated error code on a failure.
*/
inode_semtake(); /* Hold the semaphore through the unbind logic */
ret = mountpt_inode->u.i_mops->unbind(mountpt_inode->i_private,
&blkdrvr_inode, flags);
if (ret < 0)
{
/* The inode is unhappy with the blkdrvr for some reason */
errcode = -ret;
goto errout_with_semaphore;
}
else if (ret > 0)
{
errcode = EBUSY;
goto errout_with_semaphore;
}
/* Successfully unbound. Convert the mountpoint inode to regular
* pseudo-file inode.
*/
mountpt_inode->i_flags &= ~FSNODEFLAG_TYPE_MASK;
mountpt_inode->i_private = NULL;
mountpt_inode->u.i_mops = NULL;
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If the node has children, then do not delete it. */
if (mountpt_inode->i_child != NULL)
{
/* Just decrement the reference count (without deleting it) */
DEBUGASSERT(mountpt_inode->i_crefs > 0);
mountpt_inode->i_crefs--;
}
else
#endif
{
/* Remove the mountpoint inode from the inode tree. The inode will
* not be deleted yet because there is still at least reference on
* it (from the mount)
*/
ret = inode_remove(target);
inode_semgive();
/* The return value of -EBUSY is normal (in fact, it should
* not be OK)
*/
if (ret != OK && ret != -EBUSY)
{
errcode = -ret;
goto errout_with_mountpt;
}
/* Release the mountpoint inode and any block driver inode
* returned by the file system unbind above. This should cause
* the inode to be deleted (unless there are other references)
*/
inode_release(mountpt_inode);
}
/* Did the unbind method return a contained block driver */
if (blkdrvr_inode)
{
inode_release(blkdrvr_inode);
}
RELEASE_SEARCH(&desc);
return OK;
/* A lot of goto's! But they make the error handling much simpler */
errout_with_semaphore:
inode_semgive();
errout_with_mountpt:
inode_release(mountpt_inode);
if (blkdrvr_inode)
{
inode_release(blkdrvr_inode);
}
errout_with_search:
RELEASE_SEARCH(&desc);
errout:
set_errno(errcode);
return ERROR;
}
int rmdir(FAR const char *pathname)
{
FAR struct inode *inode;
const char *relpath = NULL;
int errcode;
/* Get an inode for this file. inode_find() automatically increments the
* reference count on the inode if one is found.
*/
inode = inode_find(pathname, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Check if the inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
{
/* Perform the rmdir operation using the relative path
* from the mountpoint.
*/
if (inode->u.i_mops->rmdir)
{
int ret = inode->u.i_mops->rmdir(inode, relpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_inode;
}
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If this is a "dangling" pseudo-directory node (i.e., it has no operations)
* then rmdir should remove the node.
*/
if (!inode->u.i_ops)
{
int ret;
/* If the directory inode has children, however, then it cannot be
* removed.
*/
if (inode->i_child)
{
errcode = ENOTEMPTY;
goto errout_with_inode;
}
/* Remove the inode. NOTE: Because we hold a reference count on the
* inode, it will not be deleted now. But probably when inode_release()
* is called below. inode_remove should return -EBUSY to indicate that
* the inode was not deleted now.
*/
inode_semtake();
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = ENOTDIR;
goto errout_with_inode;
}
#else
{
errcode = ENXIO;
goto errout_with_inode;
}
#endif
/* Successfully removed the directory */
inode_release(inode);
return OK;
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
return ERROR;
}
bool dir_remove (struct dir *directory, const char *file)
{
struct dir_entry directory_element_1, directory_element_2;
struct inode *inode = NULL;
bool present = false;
off_t offset_1, offset_2;
int count;
ASSERT(directory != NULL);
ASSERT(file != NULL);
acquire_inode_lock (directory->inode);
for (offset_2 = 0;
inode_read_at (directory->inode, &directory_element_2,
sizeof directory_element_2, offset_2) == sizeof directory_element_2;
offset_2 += sizeof directory_element_2)
if (directory_element_2.in_use
&& !strcmp (file, directory_element_2.name))
{
directory_element_1 = directory_element_2;
offset_1 = offset_2;
present = true;
}
if (!present)
{
inode_close (inode);
release_inode_lock (directory->inode);
return false;
}
inode = inode_open (directory_element_1.inode_sector);
if (inode == NULL)
{
inode_close (inode);
release_inode_lock (directory->inode);
return false;
}
if (is_inode_dir (inode) && get_inode_open_cnt (inode) > 1)
{
inode_close (inode);
release_inode_lock (directory->inode);
return false;
}
if (is_inode_dir (inode) && !dir_is_empty (inode))
{
inode_close (inode);
release_inode_lock (directory->inode);
return false;
}
directory_element_1.in_use = false;
offset_2 = inode_write_at (directory->inode, &directory_element_1,
sizeof directory_element_1, offset_1);
if (sizeof directory_element_1 != offset_2)
{
inode_close (inode);
release_inode_lock (directory->inode);
return false;
}
inode_remove (inode);
inode_close (inode);
release_inode_lock (directory->inode);
return true;
}
