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vboxsf: Add vboxsf_[create|release]_sf_handle() helpers 

Factor out the code to create / release a struct vboxsf_handle into
2 new helper functions.

This is a preparation patch for adding atomic_open support.

Fixes: 0fd1695766 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2021-01-21 10:55:03 +01:00
parent ab0c29687b
commit 02f840f907
2 changed files with 52 additions and 28 deletions
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73
fs/vboxsf/file.c
View File

@ -20,18 +20,40 @@ struct vboxsf_handle {
struct list_head head;
};
static int vboxsf_file_open(struct inode *inode, struct file *file)
struct vboxsf_handle *vboxsf_create_sf_handle(struct inode *inode,
u64 handle, u32 access_flags)
{
struct vboxsf_inode *sf_i = VBOXSF_I(inode);
struct vboxsf_handle *sf_handle;
sf_handle = kmalloc(sizeof(*sf_handle), GFP_KERNEL);
if (!sf_handle)
return ERR_PTR(-ENOMEM);
/* the host may have given us different attr then requested */
sf_i->force_restat = 1;
/* init our handle struct and add it to the inode's handles list */
sf_handle->handle = handle;
sf_handle->root = VBOXSF_SBI(inode->i_sb)->root;
sf_handle->access_flags = access_flags;
kref_init(&sf_handle->refcount);
mutex_lock(&sf_i->handle_list_mutex);
list_add(&sf_handle->head, &sf_i->handle_list);
mutex_unlock(&sf_i->handle_list_mutex);
return sf_handle;
}
static int vboxsf_file_open(struct inode *inode, struct file *file)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
struct shfl_createparms params = {};
struct vboxsf_handle *sf_handle;
u32 access_flags = 0;
int err;
sf_handle = kmalloc(sizeof(*sf_handle), GFP_KERNEL);
if (!sf_handle)
return -ENOMEM;
/*
* We check the value of params.handle afterwards to find out if
* the call succeeded or failed, as the API does not seem to cleanly
@ -83,24 +105,15 @@ static int vboxsf_file_open(struct inode *inode, struct file *file)
err = vboxsf_create_at_dentry(file_dentry(file), &params);
if (err == 0 && params.handle == SHFL_HANDLE_NIL)
err = (params.result == SHFL_FILE_EXISTS) ? -EEXIST : -ENOENT;
if (err) {
kfree(sf_handle);
if (err)
return err;
sf_handle = vboxsf_create_sf_handle(inode, params.handle, access_flags);
if (IS_ERR(sf_handle)) {
vboxsf_close(sbi->root, params.handle);
return PTR_ERR(sf_handle);
}
/* the host may have given us different attr then requested */
sf_i->force_restat = 1;
/* init our handle struct and add it to the inode's handles list */
sf_handle->handle = params.handle;
sf_handle->root = VBOXSF_SBI(inode->i_sb)->root;
sf_handle->access_flags = access_flags;
kref_init(&sf_handle->refcount);
mutex_lock(&sf_i->handle_list_mutex);
list_add(&sf_handle->head, &sf_i->handle_list);
mutex_unlock(&sf_i->handle_list_mutex);
file->private_data = sf_handle;
return 0;
}
@ -114,22 +127,26 @@ static void vboxsf_handle_release(struct kref *refcount)
kfree(sf_handle);
}
static int vboxsf_file_release(struct inode *inode, struct file *file)
void vboxsf_release_sf_handle(struct inode *inode, struct vboxsf_handle *sf_handle)
{
struct vboxsf_inode *sf_i = VBOXSF_I(inode);
struct vboxsf_handle *sf_handle = file->private_data;
/*
* When a file is closed on our (the guest) side, we want any subsequent
* accesses done on the host side to see all changes done from our side.
*/
filemap_write_and_wait(inode->i_mapping);
mutex_lock(&sf_i->handle_list_mutex);
list_del(&sf_handle->head);
mutex_unlock(&sf_i->handle_list_mutex);
kref_put(&sf_handle->refcount, vboxsf_handle_release);
}
static int vboxsf_file_release(struct inode *inode, struct file *file)
{
/*
* When a file is closed on our (the guest) side, we want any subsequent
* accesses done on the host side to see all changes done from our side.
*/
filemap_write_and_wait(inode->i_mapping);
vboxsf_release_sf_handle(inode, file->private_data);
return 0;
}

7
fs/vboxsf/vfsmod.h
View File

@ -18,6 +18,8 @@
#define VBOXSF_SBI(sb) ((struct vboxsf_sbi *)(sb)->s_fs_info)
#define VBOXSF_I(i) container_of(i, struct vboxsf_inode, vfs_inode)
struct vboxsf_handle;
struct vboxsf_options {
unsigned long ttl;
kuid_t uid;
@ -80,6 +82,11 @@ extern const struct file_operations vboxsf_reg_fops;
extern const struct address_space_operations vboxsf_reg_aops;
extern const struct dentry_operations vboxsf_dentry_ops;
/* from file.c */
struct vboxsf_handle *vboxsf_create_sf_handle(struct inode *inode,
u64 handle, u32 access_flags);
void vboxsf_release_sf_handle(struct inode *inode, struct vboxsf_handle *sf_handle);
/* from utils.c */
struct inode *vboxsf_new_inode(struct super_block *sb);
int vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,