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authorMiklos Szeredi <mszeredi@suse.cz>2007-10-16 23:31:00 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:43:03 -0700
commitc756e0a4d79202535774806f148026e40466a5eb (patch)
treeaa769ecfe2204e2e1969108d2c391b88b95e983b /fs/fuse/fuse_i.h
parentde5e3dec421c44c999071b8f7e0580ad2ade92ae (diff)
downloadlwn-c756e0a4d79202535774806f148026e40466a5eb.tar.gz
lwn-c756e0a4d79202535774806f148026e40466a5eb.zip
fuse: add reference counting to fuse_file
Make lifetime of 'struct fuse_file' independent from 'struct file' by adding a reference counter and destructor. This will enable asynchronous page writeback, where it cannot be guaranteed, that the file is not released while a request with this file handle is being served. The actual RELEASE request is only sent when there are no more references to the fuse_file. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fuse/fuse_i.h')
-rw-r--r--fs/fuse/fuse_i.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 95bcb433d1b4..60683b787250 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -72,6 +72,9 @@ struct fuse_file {
/** File handle used by userspace */
u64 fh;
+
+ /** Refcount */
+ atomic_t count;
};
/** One input argument of a request */
@@ -216,7 +219,7 @@ struct fuse_req {
unsigned page_offset;
/** File used in the request (or NULL) */
- struct file *file;
+ struct fuse_file *ff;
/** vfsmount used in release */
struct vfsmount *vfsmount;
@@ -420,7 +423,7 @@ void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
/**
* Initialize READ or READDIR request
*/
-void fuse_read_fill(struct fuse_req *req, struct file *file,
+void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
struct inode *inode, loff_t pos, size_t count, int opcode);
/**
@@ -433,9 +436,9 @@ void fuse_file_free(struct fuse_file *ff);
void fuse_finish_open(struct inode *inode, struct file *file,
struct fuse_file *ff, struct fuse_open_out *outarg);
-/** */
-struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags,
- int opcode);
+/** Fill in ff->reserved_req with a RELEASE request */
+void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode);
+
/**
* Send RELEASE or RELEASEDIR request
*/