NFS: Fix the ftruncate() credential problem

ftruncate() access checking is supposed to be performed at open() time,
just like reads and writes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 596c5d8..2e4ab4a 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -347,7 +347,7 @@ out_no_inode:
        goto out;
 }
 
-#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
+#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
 
 int
 nfs_setattr(struct dentry *dentry, struct iattr *attr)
@@ -369,7 +369,7 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
 
        /* Optimization: if the end result is no change, don't RPC */
        attr->ia_valid &= NFS_VALID_ATTRS;
-       if (attr->ia_valid == 0)
+       if ((attr->ia_valid & ~ATTR_FILE) == 0)
                return 0;
 
        lock_kernel();

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index cf7d4e5..b9c2d99 100644 (file)
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -129,6 +129,8 @@ nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
        int     status;
 
        dprintk("NFS call  setattr\n");
+       if (sattr->ia_valid & ATTR_FILE)
+               msg.rpc_cred = nfs_file_cred(sattr->ia_file);
        nfs_fattr_init(fattr);
        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
        if (status == 0)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 26fbeb3..31a7e4c 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1139,8 +1139,9 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int
        return res;
 }
 
-static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
-                struct iattr *sattr, struct nfs4_state *state)
+static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
+                           struct nfs_fattr *fattr, struct iattr *sattr,
+                           struct nfs4_state *state)
 {
        struct nfs_server *server = NFS_SERVER(inode);
         struct nfs_setattrargs  arg = {
@@ -1154,9 +1155,10 @@ static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
                .server         = server,
         };
         struct rpc_message msg = {
-                .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
-                .rpc_argp       = &arg,
-                .rpc_resp       = &res,
+               .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
+               .rpc_argp       = &arg,
+               .rpc_resp       = &res,
+               .rpc_cred       = cred,
         };
        unsigned long timestamp = jiffies;
        int status;
@@ -1166,7 +1168,6 @@ static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
        if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
                /* Use that stateid */
        } else if (state != NULL) {
-               msg.rpc_cred = state->owner->so_cred;
                nfs4_copy_stateid(&arg.stateid, state, current->files);
        } else
                memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
@@ -1177,15 +1178,16 @@ static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
        return status;
 }
 
-static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
-                struct iattr *sattr, struct nfs4_state *state)
+static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
+                          struct nfs_fattr *fattr, struct iattr *sattr,
+                          struct nfs4_state *state)
 {
        struct nfs_server *server = NFS_SERVER(inode);
        struct nfs4_exception exception = { };
        int err;
        do {
                err = nfs4_handle_exception(server,
-                               _nfs4_do_setattr(inode, fattr, sattr, state),
+                               _nfs4_do_setattr(inode, cred, fattr, sattr, state),
                                &exception);
        } while (exception.retry);
        return err;
@@ -1647,29 +1649,25 @@ static int
 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
                  struct iattr *sattr)
 {
-       struct rpc_cred *cred;
        struct inode *inode = dentry->d_inode;
-       struct nfs_open_context *ctx;
+       struct rpc_cred *cred = NULL;
        struct nfs4_state *state = NULL;
        int status;
 
        nfs_fattr_init(fattr);
        
-       cred = rpc_lookup_cred();
-       if (IS_ERR(cred))
-               return PTR_ERR(cred);
-
        /* Search for an existing open(O_WRITE) file */
-       ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
-       if (ctx != NULL)
+       if (sattr->ia_valid & ATTR_FILE) {
+               struct nfs_open_context *ctx;
+
+               ctx = nfs_file_open_context(sattr->ia_file);
+               cred = ctx->cred;
                state = ctx->state;
+       }
 
-       status = nfs4_do_setattr(inode, fattr, sattr, state);
+       status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
        if (status == 0)
                nfs_setattr_update_inode(inode, sattr);
-       if (ctx != NULL)
-               put_nfs_open_context(ctx);
-       put_rpccred(cred);
        return status;
 }
 
@@ -1897,17 +1895,16 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                goto out;
        }
        state = nfs4_do_open(dir, &path, flags, sattr, cred);
-       put_rpccred(cred);
        d_drop(dentry);
        if (IS_ERR(state)) {
                status = PTR_ERR(state);
-               goto out;
+               goto out_putcred;
        }
        d_add(dentry, igrab(state->inode));
        nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
        if (flags & O_EXCL) {
                struct nfs_fattr fattr;
-               status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
+               status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
                if (status == 0)
                        nfs_setattr_update_inode(state->inode, sattr);
                nfs_post_op_update_inode(state->inode, &fattr);
@@ -1916,6 +1913,8 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                status = nfs4_intent_set_file(nd, &path, state);
        else
                nfs4_close_sync(&path, state, flags);
+out_putcred:
+       put_rpccred(cred);
 out:
        return status;
 }

diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 5c35b02..c760558 100644 (file)
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -129,6 +129,8 @@ nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
        sattr->ia_mode &= S_IALLUGO;
 
        dprintk("NFS call  setattr\n");
+       if (sattr->ia_valid & ATTR_FILE)
+               msg.rpc_cred = nfs_file_cred(sattr->ia_file);
        nfs_fattr_init(fattr);
        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
        if (status == 0)