fuse: add file handle to getattr operation

Add necessary protocol changes for supplying a file handle with the getattr
operation.  Step the API version to 7.9.

This patch doesn't actually supply the file handle, because that needs some
kind of VFS support, which we haven't yet been able to agree upon.

[akpm@linux-foundation.org: coding-style fixes]
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>

2 files changed, 26 insertions, 13 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index a058b66..8c5d156 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -705,10 +705,12 @@ static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
 	stat->blksize = (1 << inode->i_blkbits);
 }
 
-static int fuse_do_getattr(struct inode *inode, struct kstat *stat)
+static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
+			   struct file *file)
 {
 	int err;
-	struct fuse_attr_out arg;
+	struct fuse_getattr_in inarg;
+	struct fuse_attr_out outarg;
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	struct fuse_req *req;
 	u64 attr_version;
@@ -721,24 +723,35 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat)
 	attr_version = fc->attr_version;
 	spin_unlock(&fc->lock);
 
+	memset(&inarg, 0, sizeof(inarg));
+	/* Directories have separate file-handle space */
+	if (file && S_ISREG(inode->i_mode)) {
+		struct fuse_file *ff = file->private_data;
+
+		inarg.getattr_flags |= FUSE_GETATTR_FH;
+		inarg.fh = ff->fh;
+	}
 	req->in.h.opcode = FUSE_GETATTR;
 	req->in.h.nodeid = get_node_id(inode);
+	req->in.numargs = 1;
+	req->in.args[0].size = sizeof(inarg);
+	req->in.args[0].value = &inarg;
 	req->out.numargs = 1;
-	req->out.args[0].size = sizeof(arg);
-	req->out.args[0].value = &arg;
+	req->out.args[0].size = sizeof(outarg);
+	req->out.args[0].value = &outarg;
 	request_send(fc, req);
 	err = req->out.h.error;
 	fuse_put_request(fc, req);
 	if (!err) {
-		if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
+		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
 			make_bad_inode(inode);
 			err = -EIO;
 		} else {
-			fuse_change_attributes(inode, &arg.attr,
-					       attr_timeout(&arg),
+			fuse_change_attributes(inode, &outarg.attr,
+					       attr_timeout(&outarg),
 					       attr_version);
 			if (stat)
-				fuse_fillattr(inode, &arg.attr, stat);
+				fuse_fillattr(inode, &outarg.attr, stat);
 		}
 	}
 	return err;
@@ -833,7 +846,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
 	    ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
 		struct fuse_inode *fi = get_fuse_inode(inode);
 		if (fi->i_time < get_jiffies_64()) {
-			err = fuse_do_getattr(inode, NULL);
+			err = fuse_do_getattr(inode, NULL, NULL);
 			if (err)
 				return err;
 
@@ -848,7 +861,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
 		   attributes.  This is also needed, because the root
 		   node will at first have no permissions */
 		if (err == -EACCES && !refreshed) {
-			err = fuse_do_getattr(inode, NULL);
+			err = fuse_do_getattr(inode, NULL, NULL);
 			if (!err)
 				err = generic_permission(inode, mask, NULL);
 		}
@@ -864,7 +877,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
 			if (refreshed)
 				return -EACCES;
 
-			err = fuse_do_getattr(inode, NULL);
+			err = fuse_do_getattr(inode, NULL, NULL);
 			if (!err && !(inode->i_mode & S_IXUGO))
 				return -EACCES;
 		}
@@ -1107,7 +1120,7 @@ static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
 		return -EACCES;
 
 	if (fi->i_time < get_jiffies_64())
-		err = fuse_do_getattr(inode, stat);
+		err = fuse_do_getattr(inode, stat, NULL);
 	else {
 		err = 0;
 		generic_fillattr(inode, stat);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 2167fc4..6ef3973 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -553,7 +553,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
 	arg->major = FUSE_KERNEL_VERSION;
 	arg->minor = FUSE_KERNEL_MINOR_VERSION;
 	arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
-	arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
+	arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_FILE_OPS;
 	req->in.h.opcode = FUSE_INIT;
 	req->in.numargs = 1;
 	req->in.args[0].size = sizeof(*arg);