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authorTrond Myklebust <Trond.Myklebust@netapp.com>2005-08-16 11:49:44 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-16 09:30:58 -0700
commit65e4308d2500e7daf60c3dccc202c61ffb066c63 (patch)
tree76a2e00004f645d09b2e59b485fb2aea0af45234
parent367ae3cd74bdc2ad32d71293427fec570b14ddcd (diff)
[PATCH] NFS: Ensure we always update inode->i_mode when doing O_EXCL creates
When the client performs an exclusive create and opens the file for writing, a Netapp filer will first create the file using the mode 01777. It does this since an NFSv3/v4 exclusive create cannot immediately set the mode bits. The 01777 mode then gets put into the inode->i_mode. After the file creation is successful, we then do a setattr to change the mode to the correct value (as per the NFS spec). The problem is that nfs_refresh_inode() no longer updates inode->i_mode, so the latter retains the 01777 mode. A bit later, the VFS notices this, and calls remove_suid(). This of course now resets the file mode to inode->i_mode & 0777. Hey presto, the file mode on the server is now magically changed to 0777. Duh... Fixes http://bugzilla.linux-nfs.org/show_bug.cgi?id=32 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/nfs/inode.c37
-rw-r--r--fs/nfs/nfs3proc.c4
-rw-r--r--fs/nfs/nfs4proc.c10
-rw-r--r--fs/nfs/proc.c2
-rw-r--r--include/linux/nfs_fs.h1
5 files changed, 39 insertions, 15 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 4845911f1c6..bb7ca022bcb 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -814,28 +814,39 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
nfs_wb_all(inode);
}
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
- if (error == 0) {
+ if (error == 0)
nfs_refresh_inode(inode, &fattr);
+ nfs_end_data_update(inode);
+ unlock_kernel();
+ return error;
+}
+
+/**
+ * nfs_setattr_update_inode - Update inode metadata after a setattr call.
+ * @inode: pointer to struct inode
+ * @attr: pointer to struct iattr
+ *
+ * Note: we do this in the *proc.c in order to ensure that
+ * it works for things like exclusive creates too.
+ */
+void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
+{
+ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
if ((attr->ia_valid & ATTR_MODE) != 0) {
- int mode;
- mode = inode->i_mode & ~S_IALLUGO;
- mode |= attr->ia_mode & S_IALLUGO;
+ int mode = attr->ia_mode & S_IALLUGO;
+ mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
}
if ((attr->ia_valid & ATTR_UID) != 0)
inode->i_uid = attr->ia_uid;
if ((attr->ia_valid & ATTR_GID) != 0)
inode->i_gid = attr->ia_gid;
- if ((attr->ia_valid & ATTR_SIZE) != 0) {
- inode->i_size = attr->ia_size;
- vmtruncate(inode, attr->ia_size);
- }
- }
- if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
- nfs_end_data_update(inode);
- unlock_kernel();
- return error;
+ }
+ if ((attr->ia_valid & ATTR_SIZE) != 0) {
+ inode->i_size = attr->ia_size;
+ vmtruncate(inode, attr->ia_size);
+ }
}
/*
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 7851569b31c..2681485cf2d 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -120,6 +120,8 @@ nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
dprintk("NFS call setattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);
+ if (status == 0)
+ nfs_setattr_update_inode(inode, sattr);
dprintk("NFS reply setattr: %d\n", status);
return status;
}
@@ -370,6 +372,8 @@ again:
* not sure this buys us anything (and I'd have
* to revamp the NFSv3 XDR code) */
status = nfs3_proc_setattr(dentry, &fattr, sattr);
+ if (status == 0)
+ nfs_setattr_update_inode(dentry->d_inode, sattr);
nfs_refresh_inode(dentry->d_inode, &fattr);
dprintk("NFS reply setattr (post-create): %d\n", status);
}
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1b76f80aedb..0c5a308e496 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -753,6 +753,7 @@ static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
.rpc_argp = &arg,
.rpc_resp = &res,
};
+ int status;
fattr->valid = 0;
@@ -762,7 +763,8 @@ static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
} else
memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
- return rpc_call_sync(server->client, &msg, 0);
+ status = rpc_call_sync(server->client, &msg, 0);
+ return status;
}
static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
@@ -1145,6 +1147,8 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
NFS_FH(inode), sattr, state);
+ if (status == 0)
+ nfs_setattr_update_inode(inode, sattr);
if (state != NULL)
nfs4_close_state(state, FMODE_WRITE);
put_rpccred(cred);
@@ -1449,8 +1453,10 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
struct nfs_fattr fattr;
status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
NFS_FH(state->inode), sattr, state);
- if (status == 0)
+ if (status == 0) {
+ nfs_setattr_update_inode(state->inode, sattr);
goto out;
+ }
} else if (flags != 0)
goto out;
nfs4_close_state(state, flags);
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index cedf636bcf3..be23c3fb926 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -114,6 +114,8 @@ nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
dprintk("NFS call setattr\n");
fattr->valid = 0;
status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0);
+ if (status == 0)
+ nfs_setattr_update_inode(inode, sattr);
dprintk("NFS reply setattr: %d\n", status);
return status;
}
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 8ea249110fb..7d78a783c64 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -292,6 +292,7 @@ extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
+extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);