OrgApache/incubator-nuttx
OrgApache
/
incubator-nuttx
mirror of https://github.com/apache/incubator-nuttx.git
1
0
Fork 0
Code Issues Releases Wiki Activity

add munmap logic to pseudofs

This commit is contained in:
ThomasNS 2023-10-09 21:38:58 +02:00 committed by Xiang Xiao
parent d27ca03b6c
commit 696717b28b
1 changed files with 71 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
fs/vfs/fs_pseudofile.c
View File

@ -66,6 +66,10 @@ static off_t pseudofile_seek(FAR struct file *filep, off_t offset,
int whence);
static int pseudofile_mmap(FAR struct file *filep,
FAR struct mm_map_entry_s *map);
static int pseudofile_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *map,
FAR void *start,
size_t length);
static int pseudofile_truncate(FAR struct file *filep, off_t length);
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
static int pseudofile_unlink(FAR struct inode *inode);
@ -309,14 +313,76 @@ static int pseudofile_mmap(FAR struct file *filep,
FAR struct inode *node = filep->f_inode;
FAR struct fs_pseudofile_s *pf = node->i_private;
if (map->offset >= 0 && map->offset < node->i_size &&
map->length != 0 && map->offset + map->length <= node->i_size)
/* Keep the inode when mmapped, increase refcount */
int ret = inode_addref(node);
if (ret >= 0)
{
map->vaddr = pf->content + map->offset;
return OK;
if (map->offset >= 0 && map->offset < node->i_size &&
map->length != 0 && map->offset + map->length <= node->i_size)
{
map->vaddr = pf->content + map->offset;
map->munmap = pseudofile_munmap;
map->priv.p = (FAR void *)node;
ret = mm_map_add(get_current_mm(), map);
}
else
{
ret = -EINVAL;
}
if (ret < 0)
{
inode_release(node);
}
}
return -EINVAL;
return ret;
}
static int pseudofile_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *map,
FAR void *start,
size_t length)
{
FAR struct inode *inode = (FAR struct inode *)map->priv.p;
/* If the file has been unlinked previously, delete the contents.
* The inode is released after this call, hence checking if i_crefs <= 1.
*/
int ret = inode_lock();
if (ret >= 0)
{
if (inode->i_parent == NULL &&
inode->i_crefs <= 1)
{
/* Delete the inode metadata */
if (inode->i_private)
{
kmm_free(inode->i_private);
}
inode->i_private = NULL;
ret = OK;
}
inode_unlock();
}
/* Unkeep the inode when unmapped, decrease refcount */
if (ret == OK)
{
inode_release(inode);
/* Remove the mapping. */
ret = mm_map_remove(get_group_mm(group), map);
}
return ret;
}
static int pseudofile_truncate(FAR struct file *filep, off_t length)