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Diffstat (limited to 'fs/fuse/fuse_i.h')
-rw-r--r--fs/fuse/fuse_i.h153
1 files changed, 134 insertions, 19 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index bcbe34488862..b24084b60864 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -76,6 +76,16 @@ struct fuse_submount_lookup {
struct fuse_forget_link *forget;
};
+/** Container for data related to mapping to backing file */
+struct fuse_backing {
+ struct file *file;
+ struct cred *cred;
+
+ /** refcount */
+ refcount_t count;
+ struct rcu_head rcu;
+};
+
/** FUSE inode */
struct fuse_inode {
/** Inode data */
@@ -111,7 +121,7 @@ struct fuse_inode {
u64 attr_version;
union {
- /* Write related fields (regular file only) */
+ /* read/write io cache (regular file only) */
struct {
/* Files usable in writepage. Protected by fi->lock */
struct list_head write_files;
@@ -123,9 +133,15 @@ struct fuse_inode {
* (FUSE_NOWRITE) means more writes are blocked */
int writectr;
+ /** Number of files/maps using page cache */
+ int iocachectr;
+
/* Waitq for writepage completion */
wait_queue_head_t page_waitq;
+ /* waitq for direct-io completion */
+ wait_queue_head_t direct_io_waitq;
+
/* List of writepage requestst (pending or sent) */
struct rb_root writepages;
};
@@ -173,6 +189,10 @@ 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 */
@@ -187,19 +207,21 @@ enum {
FUSE_I_BAD,
/* Has btime */
FUSE_I_BTIME,
+ /* Wants or already has page cache IO */
+ FUSE_I_CACHE_IO_MODE,
};
struct fuse_conn;
struct fuse_mount;
-struct fuse_release_args;
+union fuse_file_args;
/** FUSE specific file data */
struct fuse_file {
/** Fuse connection for this file */
struct fuse_mount *fm;
- /* Argument space reserved for release */
- struct fuse_release_args *release_args;
+ /* Argument space reserved for open/release */
+ union fuse_file_args *args;
/** Kernel file handle guaranteed to be unique */
u64 kh;
@@ -221,12 +243,6 @@ struct fuse_file {
/* Readdir related */
struct {
- /*
- * Protects below fields against (crazy) parallel readdir on
- * same open file. Uncontended in the normal case.
- */
- struct mutex lock;
-
/* Dir stream position */
loff_t pos;
@@ -244,6 +260,15 @@ struct fuse_file {
/** Wait queue head for poll */
wait_queue_head_t poll_wait;
+ /** Does file hold a fi->iocachectr refcount? */
+ enum { IOM_NONE, IOM_CACHED, IOM_UNCACHED } iomode;
+
+#ifdef CONFIG_FUSE_PASSTHROUGH
+ /** Reference to backing file in passthrough mode */
+ struct file *passthrough;
+ const struct cred *cred;
+#endif
+
/** Has flock been performed on this file? */
bool flock:1;
};
@@ -283,6 +308,7 @@ struct fuse_args {
bool page_replace:1;
bool may_block:1;
bool is_ext:1;
+ bool is_pinned:1;
struct fuse_in_arg in_args[3];
struct fuse_arg out_args[2];
void (*end)(struct fuse_mount *fm, struct fuse_args *args, int error);
@@ -295,6 +321,19 @@ struct fuse_args_pages {
unsigned int num_pages;
};
+struct fuse_release_args {
+ struct fuse_args args;
+ struct fuse_release_in inarg;
+ struct inode *inode;
+};
+
+union fuse_file_args {
+ /* Used during open() */
+ struct fuse_open_out open_outarg;
+ /* Used during release() */
+ struct fuse_release_args release_args;
+};
+
#define FUSE_ARGS(args) struct fuse_args args = {}
/** The request IO state (for asynchronous processing) */
@@ -818,6 +857,12 @@ 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;
@@ -867,6 +912,11 @@ struct fuse_conn {
/* New writepages go into this bucket */
struct fuse_sync_bucket __rcu *curr_bucket;
+
+#ifdef CONFIG_FUSE_PASSTHROUGH
+ /** IDR for backing files ids */
+ struct idr backing_files_map;
+#endif
};
/*
@@ -940,7 +990,6 @@ static inline bool fuse_stale_inode(const struct inode *inode, int generation,
static inline void fuse_make_bad(struct inode *inode)
{
- remove_inode_hash(inode);
set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
}
@@ -1032,14 +1081,9 @@ void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
size_t count, int opcode);
-/**
- * Send OPEN or OPENDIR request
- */
-int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
-
-struct fuse_file *fuse_file_alloc(struct fuse_mount *fm);
+struct fuse_file *fuse_file_alloc(struct fuse_mount *fm, bool release);
void fuse_file_free(struct fuse_file *ff);
-void fuse_finish_open(struct inode *inode, struct file *file);
+int fuse_finish_open(struct inode *inode, struct file *file);
void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff,
unsigned int flags);
@@ -1349,11 +1393,82 @@ int fuse_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int fuse_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
-/* file.c */
+/* iomode.c */
+int fuse_file_cached_io_start(struct inode *inode, struct fuse_file *ff);
+int fuse_file_uncached_io_start(struct inode *inode, struct fuse_file *ff, struct fuse_backing *fb);
+void fuse_file_uncached_io_end(struct inode *inode, struct fuse_file *ff);
+
+int fuse_file_io_open(struct file *file, struct inode *inode);
+void fuse_file_io_release(struct fuse_file *ff, struct inode *inode);
+/* file.c */
struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid,
unsigned int open_flags, bool isdir);
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
+}
+
+#ifdef CONFIG_FUSE_PASSTHROUGH
+struct fuse_backing *fuse_backing_get(struct fuse_backing *fb);
+void fuse_backing_put(struct fuse_backing *fb);
+#else
+
+static inline struct fuse_backing *fuse_backing_get(struct fuse_backing *fb)
+{
+ return NULL;
+}
+
+static inline void fuse_backing_put(struct fuse_backing *fb)
+{
+}
+#endif
+
+void fuse_backing_files_init(struct fuse_conn *fc);
+void fuse_backing_files_free(struct fuse_conn *fc);
+int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map);
+int fuse_backing_close(struct fuse_conn *fc, int backing_id);
+
+struct fuse_backing *fuse_passthrough_open(struct file *file,
+ struct inode *inode,
+ int backing_id);
+void fuse_passthrough_release(struct fuse_file *ff, struct fuse_backing *fb);
+
+static inline struct file *fuse_file_passthrough(struct fuse_file *ff)
+{
+#ifdef CONFIG_FUSE_PASSTHROUGH
+ return ff->passthrough;
+#else
+ return NULL;
+#endif
+}
+
+ssize_t fuse_passthrough_read_iter(struct kiocb *iocb, struct iov_iter *iter);
+ssize_t fuse_passthrough_write_iter(struct kiocb *iocb, struct iov_iter *iter);
+ssize_t fuse_passthrough_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe,
+ size_t len, unsigned int flags);
+ssize_t fuse_passthrough_splice_write(struct pipe_inode_info *pipe,
+ struct file *out, loff_t *ppos,
+ size_t len, unsigned int flags);
+ssize_t fuse_passthrough_mmap(struct file *file, struct vm_area_struct *vma);
+
#endif /* _FS_FUSE_I_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 06:10:10 +0000