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fs/9p: Make the writeback_fid owned by root

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Changes to make sure writeback fid is owned by root

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V 2011-02-28 17:04:11 +05:30 committed by Eric Van Hensbergen
parent 3dc5436aa5
commit 7c9e592e1f
1 changed files with 56 additions and 36 deletions
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92
fs/9p/fid.c
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@ -125,46 +125,17 @@ static int build_path_from_dentry(struct v9fs_session_info *v9ses,
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 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
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) {