diff options
Diffstat (limited to 'fs/fuse/fuse_i.h')
| -rw-r--r-- | fs/fuse/fuse_i.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 2e7af883e4b3..19a86acc9dd0 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -76,6 +76,15 @@ struct fuse_submount_lookup { struct fuse_forget_link *forget; }; +/** Container for data related to mapping to backing file */ +struct fuse_backing { + struct file *file; + + /** refcount */ + refcount_t count; + struct rcu_head rcu; +}; + /** FUSE inode */ struct fuse_inode { /** Inode data */ @@ -179,6 +188,10 @@ struct fuse_inode { #endif /** Submount specific lookup tracking */ struct fuse_submount_lookup *submount_lookup; +#ifdef CONFIG_FUSE_PASSTHROUGH + /** Reference to backing file in passthrough mode */ + struct fuse_backing *fb; +#endif }; /** FUSE inode state bits */ @@ -829,6 +842,12 @@ struct fuse_conn { /* Is statx not implemented by fs? */ unsigned int no_statx:1; + /** Passthrough support for read/write IO */ + unsigned int passthrough:1; + + /** Maximum stack depth for passthrough backing files */ + int max_stack_depth; + /** The number of requests waiting for completion */ atomic_t num_waiting; @@ -1368,4 +1387,27 @@ struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid, void fuse_file_release(struct inode *inode, struct fuse_file *ff, unsigned int open_flags, fl_owner_t id, bool isdir); +/* passthrough.c */ +static inline struct fuse_backing *fuse_inode_backing(struct fuse_inode *fi) +{ +#ifdef CONFIG_FUSE_PASSTHROUGH + return READ_ONCE(fi->fb); +#else + return NULL; +#endif +} + +static inline struct fuse_backing *fuse_inode_backing_set(struct fuse_inode *fi, + struct fuse_backing *fb) +{ +#ifdef CONFIG_FUSE_PASSTHROUGH + return xchg(&fi->fb, fb); +#else + return NULL; +#endif +} + +struct fuse_backing *fuse_backing_get(struct fuse_backing *fb); +void fuse_backing_put(struct fuse_backing *fb); + #endif /* _FS_FUSE_I_H */ |