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fuse: get rid of fuse_mount refcount 

Fuse mount now only ever has a refcount of one (before being freed) so the
count field is unnecessary.

Remove the refcounting and fold fuse_mount_put() into callers.  The only
caller of fuse_mount_put() where fm->fc was NULL is fuse_dentry_automount()
and here the fuse_conn_put() can simply be omitted.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-11-11 17:22:32 +01:00
parent b19d3d00d6
commit 514b5e3ff4
4 changed files with 11 additions and 26 deletions
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3
fs/fuse/dir.c
View File

@ -328,12 +328,11 @@ static struct vfsmount *fuse_dentry_automount(struct path *path)
if (!fm)
goto out_put_fsc;
refcount_set(&fm->count, 1);
fsc->s_fs_info = fm;
sb = sget_fc(fsc, NULL, set_anon_super_fc);
if (IS_ERR(sb)) {
err = PTR_ERR(sb);
fuse_mount_put(fm);
kfree(fm);
goto out_put_fsc;
}
fm->fc = fuse_conn_get(fc);

8
fs/fuse/fuse_i.h
View File

@ -801,9 +801,6 @@ struct fuse_mount {
/* Underlying (potentially shared) connection to the FUSE server */
struct fuse_conn *fc;
/* Refcount */
refcount_t count;
/*
* Super block for this connection (fc->killsb must be held when
* accessing this).
@ -1024,11 +1021,6 @@ void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
*/
void fuse_conn_put(struct fuse_conn *fc);
/**
* Release reference to fuse_mount
*/
void fuse_mount_put(struct fuse_mount *fm);
struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
struct fuse_dev *fuse_dev_alloc(void);
void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);

17
fs/fuse/inode.c
View File

@ -452,7 +452,8 @@ static void fuse_put_super(struct super_block *sb)
{
struct fuse_mount *fm = get_fuse_mount_super(sb);
fuse_mount_put(fm);
fuse_conn_put(fm->fc);
kfree(fm);
}
static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
@ -705,7 +706,6 @@ void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
INIT_LIST_HEAD(&fc->mounts);
list_add(&fm->fc_entry, &fc->mounts);
fm->fc = fc;
refcount_set(&fm->count, 1);
}
EXPORT_SYMBOL_GPL(fuse_conn_init);
@ -732,16 +732,6 @@ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
}
EXPORT_SYMBOL_GPL(fuse_conn_get);
void fuse_mount_put(struct fuse_mount *fm)
{
if (refcount_dec_and_test(&fm->count)) {
if (fm->fc)
fuse_conn_put(fm->fc);
kfree(fm);
}
}
EXPORT_SYMBOL_GPL(fuse_mount_put);
static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
{
struct fuse_attr attr;
@ -1458,7 +1448,8 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
return 0;
err_put_conn:
fuse_mount_put(fm);
fuse_conn_put(fc);
kfree(fm);
sb->s_fs_info = NULL;
err_fput:
fput(file);

9
fs/fuse/virtio_fs.c
View File

@ -1445,15 +1445,18 @@ static int virtio_fs_get_tree(struct fs_context *fsc)
fsc->s_fs_info = fm;
sb = sget_fc(fsc, virtio_fs_test_super, set_anon_super_fc);
if (fsc->s_fs_info)
fuse_mount_put(fm);
if (fsc->s_fs_info) {
fuse_conn_put(fc);
kfree(fm);
}
if (IS_ERR(sb))
return PTR_ERR(sb);
if (!sb->s_root) {
err = virtio_fs_fill_super(sb, fsc);
if (err) {
fuse_mount_put(fm);
fuse_conn_put(fc);
kfree(fm);
sb->s_fs_info = NULL;
deactivate_locked_super(sb);
return err;