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fuse: add file kernel handle

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The file handle, fuse_file->fh, is opaque value supplied by userland
FUSE server and uniqueness is not guaranteed.  Add file kernel handle,
fuse_file->kh, which is allocated by the kernel on file allocation and
guaranteed to be unique.

This will be used by poll to match notification to the respective file
but can be used for other purposes where unique file handle is
necessary.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Tejun Heo
2008-11-26 12:03:55 +01:00
committed by Miklos Szeredi
parent 59efec7b90
commit acf99433d9
4 changed files with 15 additions and 4 deletions
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8
fs/fuse/file.c
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@ -46,7 +46,7 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
return err;
}
struct fuse_file *fuse_file_alloc(void)
struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
{
struct fuse_file *ff;
ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
@ -58,6 +58,9 @@ struct fuse_file *fuse_file_alloc(void)
} else {
INIT_LIST_HEAD(&ff->write_entry);
atomic_set(&ff->count, 0);
spin_lock(&fc->lock);
ff->kh = ++fc->khctr;
spin_unlock(&fc->lock);
}
}
return ff;
@ -108,6 +111,7 @@ void fuse_finish_open(struct inode *inode, struct file *file,
int fuse_open_common(struct inode *inode, struct file *file, int isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_open_out outarg;
struct fuse_file *ff;
int err;
@ -120,7 +124,7 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir)
if (err)
return err;
ff = fuse_file_alloc();
ff = fuse_file_alloc(fc);
if (!ff)
return -ENOMEM;