[PATCH 3.16 003/306] fuse: Propagate dentry down to inode_change_ok()

[Ben Hutchings]

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@xxxxxxx>

commit 62490330769c1ce5dcba3f1f3e8f4005e9b797e6 upstream.

To avoid clearing of capabilities or security related extended
attributes too early, inode_change_ok() will need to take dentry instead
of inode. Propagate it down to fuse_do_setattr().

Acked-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
[bwh: Backported to 3.16: open-code file_dentry()]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 fs/fuse/dir.c    | 7 ++++---
 fs/fuse/file.c   | 2 +-
 fs/fuse/fuse_i.h | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1704,9 +1704,10 @@ int fuse_flush_times(struct inode *inode
  * vmtruncate() doesn't allow for this case, so do the rlimit checking
  * and the actual truncation by hand.
  */
-int fuse_do_setattr(struct inode *inode, struct iattr *attr,
+int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
 		    struct file *file)
 {
+	struct inode *inode = d_inode(dentry);
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	struct fuse_inode *fi = get_fuse_inode(inode);
 	struct fuse_req *req;
@@ -1826,9 +1827,9 @@ static int fuse_setattr(struct dentry *e
 		return -EACCES;
 
 	if (attr->ia_valid & ATTR_FILE)
-		return fuse_do_setattr(inode, attr, attr->ia_file);
+		return fuse_do_setattr(entry, attr, attr->ia_file);
 	else
-		return fuse_do_setattr(inode, attr, NULL);
+		return fuse_do_setattr(entry, attr, NULL);
 }
 
 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2879,7 +2879,7 @@ static void fuse_do_truncate(struct file
 	attr.ia_file = file;
 	attr.ia_valid |= ATTR_FILE;
 
-	fuse_do_setattr(inode, &attr, file);
+	fuse_do_setattr(file->f_dentry, &attr, file);
 }
 
 static inline loff_t fuse_round_up(loff_t off)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -894,7 +894,7 @@ bool fuse_write_update_size(struct inode
 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
 
-int fuse_do_setattr(struct inode *inode, struct iattr *attr,
+int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
 		    struct file *file);
 
 #endif /* _FS_FUSE_I_H */