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Subject[PATCH 4/6] fs/9p: Make the writeback_fid owned by root
Date
Changes to make sure writeback fid is owned by root

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/fid.c | 92 ++++++++++++++++++++++++++++++++++++-----------------------
1 files changed, 56 insertions(+), 36 deletions(-)

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 9d6a5d3..cd63e00 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -125,46 +125,17 @@ err_out:
return -ENOMEM;
}

-/**
- * v9fs_fid_lookup - lookup for a fid, try to walk if not found
- * @dentry: dentry to look for fid in
- *
- * Look for a fid in the specified dentry for the current user.
- * If no fid is found, try to create one walking from a fid from the parent
- * dentry (if it has one), or the root dentry. If the user haven't accessed
- * the fs yet, attach now and walk from the root.
- */
-
-struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
+static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
+ uid_t uid, int any)
{
- int i, n, l, clone, any, access;
- u32 uid;
- struct p9_fid *fid, *old_fid = NULL;
struct dentry *ds;
- struct v9fs_session_info *v9ses;
char **wnames, *uname;
+ int i, n, l, clone, access;
+ struct v9fs_session_info *v9ses;
+ struct p9_fid *fid, *old_fid = NULL;

v9ses = v9fs_inode2v9ses(dentry->d_inode);
access = v9ses->flags & V9FS_ACCESS_MASK;
- switch (access) {
- case V9FS_ACCESS_SINGLE:
- case V9FS_ACCESS_USER:
- case V9FS_ACCESS_CLIENT:
- uid = current_fsuid();
- any = 0;
- break;
-
- case V9FS_ACCESS_ANY:
- uid = v9ses->uid;
- any = 1;
- break;
-
- default:
- uid = ~0;
- any = 0;
- break;
- }
-
fid = v9fs_fid_find(dentry, uid, any);
if (fid)
return fid;
@@ -250,6 +221,45 @@ err_out:
return fid;
}

+/**
+ * v9fs_fid_lookup - lookup for a fid, try to walk if not found
+ * @dentry: dentry to look for fid in
+ *
+ * Look for a fid in the specified dentry for the current user.
+ * If no fid is found, try to create one walking from a fid from the parent
+ * dentry (if it has one), or the root dentry. If the user haven't accessed
+ * the fs yet, attach now and walk from the root.
+ */
+
+struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
+{
+ uid_t uid;
+ int any, access;
+ struct v9fs_session_info *v9ses;
+
+ v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ access = v9ses->flags & V9FS_ACCESS_MASK;
+ switch (access) {
+ case V9FS_ACCESS_SINGLE:
+ case V9FS_ACCESS_USER:
+ case V9FS_ACCESS_CLIENT:
+ uid = current_fsuid();
+ any = 0;
+ break;
+
+ case V9FS_ACCESS_ANY:
+ uid = v9ses->uid;
+ any = 1;
+ break;
+
+ default:
+ uid = ~0;
+ any = 0;
+ break;
+ }
+ return v9fs_fid_lookup_with_uid(dentry, uid, any);
+}
+
struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
{
struct p9_fid *fid, *ret;
@@ -262,13 +272,24 @@ struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
return ret;
}

+static struct p9_fid *v9fs_fid_clone_with_uid(struct dentry *dentry, uid_t uid)
+{
+ struct p9_fid *fid, *ret;
+
+ fid = v9fs_fid_lookup_with_uid(dentry, uid, 0);
+ if (IS_ERR(fid))
+ return fid;
+
+ ret = p9_client_walk(fid, 0, NULL, 1);
+ return ret;
+}

struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
{
int err;
struct p9_fid *fid;

- fid = v9fs_fid_clone(dentry);
+ fid = v9fs_fid_clone_with_uid(dentry, 0);
if (IS_ERR(fid))
goto error_out;
/*
@@ -276,7 +297,6 @@ struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
* dirty pages. We always request for the open fid in read-write
* mode so that a partial page write which result in page
* read can work.
- * FIXME!!: we should make the fid owned by uid = 0
*/
err = p9_client_open(fid, O_RDWR);
if (err < 0) {
--
1.7.1


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