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-rw-r--r--libdiskfs/conch-fetch.c49
-rw-r--r--libdiskfs/conch-set.c52
-rw-r--r--libdiskfs/io-prenotify.c68
-rw-r--r--libdiskfs/io-stubs.c54
4 files changed, 223 insertions, 0 deletions
diff --git a/libdiskfs/conch-fetch.c b/libdiskfs/conch-fetch.c
new file mode 100644
index 00000000..17719bd3
--- /dev/null
+++ b/libdiskfs/conch-fetch.c
@@ -0,0 +1,49 @@
+/*
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Update our copy of the relevant fields from a shared page. Callers
+ must have the share lock on the shared page as well as the inode
+ toplock. This is called by the conch management facilities of
+ libioserver as well as by us. */
+void
+ioserver_fetch_shared_data (void *arg)
+{
+ struct protid *cred = arg;
+
+ if (cred->mapped->file_size < cred->po->np->dn_stat.st_size)
+ cred->mapped->file_size = cred->po->np->dn_stat.st_size;
+ else if (cred->po->np->dn_stat.st_size != cred->mapped->file_size
+ && !readonly)
+ {
+ cred->po->np->dn_stat.st_size = cred->mapped->file_size;
+ cred->po->np->dn_set_ctime = 1;
+ }
+
+ cred->po->filepointer = cred->mapped->xx_file_pointer;
+
+ if (!readonly)
+ {
+ if (cred->mapped->written)
+ cred->po->ip->dn_set_mtime = 1;
+ if (cred->mapped->accessed)
+ cred->po->ip->dn_set_atime = 1;
+ }
+ cred->mapped->written = 0;
+ cred->mapped->accessed = 0;
+}
diff --git a/libdiskfs/conch-set.c b/libdiskfs/conch-set.c
new file mode 100644
index 00000000..4c58c071
--- /dev/null
+++ b/libdiskfs/conch-set.c
@@ -0,0 +1,52 @@
+/*
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Write current values into the shared page. Callers must have the
+ share lock on the shared page, as well as the inode toplock.
+ This is called by the conch management facilities of libioserver
+ as well as by us. */
+error_t
+ioserver_put_shared_data (void *arg)
+{
+ struct protid *cred = arg;
+ error_t error;
+
+ if (!(error = catch_exception ()))
+ {
+ cred->mapped->append_mode = (cred->po->openstat & O_APPEND);
+ cred->mapped->eof_notify = 0;
+ cred->mapped->do_sigio = 0;
+ cred->mapped->use_file_size = 1;
+ cred->mapped->use_read_size = 0;
+ cred->mapped->seekable = 1;
+ cred->mapped->use_prenotify_size = 1;
+ cred->mapped->use_postnotify_size = 0;
+ cred->mapped->prenotify_size = cred->po->ip->i_allocsize;
+
+ cred->mapped->xx_file_pointer = cred->po->filepointer;
+ cred->mapped->rd_file_pointer = -1;
+ cred->mapped->wr_file_pointer = -1;
+ cred->mapped->file_size = cred->po->ip->di->di_size;
+ cred->mapped->written = 0;
+ cred->mapped->accessed = 0;
+
+ end_catch_exception ();
+ }
+ return error;
+}
diff --git a/libdiskfs/io-prenotify.c b/libdiskfs/io-prenotify.c
new file mode 100644
index 00000000..fc6048ec
--- /dev/null
+++ b/libdiskfs/io-prenotify.c
@@ -0,0 +1,68 @@
+/*
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Implement io_prenotify as described in <hurd/io.defs>.
+
+ We set the prenotify size to be the allocated size of the file;
+ then users are forced to call this routine before writing past
+ that, and we can do allocation (orreturn ENOSPC if necessary. */
+error_t
+diskfs_S_io_prenotify (struct protid *cred,
+ int start,
+ int end)
+{
+ struct node *np;
+ int err = 0;
+
+ if (!cred)
+ return EOPNOTSUPP;
+
+ np = cred->po->np;
+
+ /* Clamp it down */
+ mutex_lock (&np->lock);
+
+ if (!cred->mapped)
+ {
+ err = EINVAL;
+ goto out;
+ }
+
+ err = ioserver_verify_user_conch (&np->conch, cred);
+ if (err)
+ goto out;
+
+ ioserver_fetch_shared_data (cred);
+
+ if (end < np->allocsize)
+ {
+ /* The user is either foolin' with us, or has the wrong
+ prenotify size, hence the diagnostic. */
+ printf ("io_prenotify: unnecessary call\n");
+ spin_lock (&cred->mapped->lock);
+ err = ioserver_put_shared_data (cred);
+ spin_unlock (&cred->mapped->lock);
+ goto out;
+ }
+
+ err = file_extend (np, end, cred);
+ out:
+ mutex_unlock (&np->i_toplock);
+ return err;
+}
diff --git a/libdiskfs/io-stubs.c b/libdiskfs/io-stubs.c
new file mode 100644
index 00000000..debb0fed
--- /dev/null
+++ b/libdiskfs/io-stubs.c
@@ -0,0 +1,54 @@
+/*
+ Copyright (C) 1994 Free Software Foundation
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Unimplemented stubs. */
+
+/* Implement io_readsleep as described in <hurd/io.defs>
+ Semantics of ordinary files say this shouldn't happen, because
+ we never set use_read_size in the shared data. */
+error_t
+S_io_readsleep (struct protid *cred)
+{
+ if (!cred)
+ return EOPNOTSUPP;
+
+ return 0;
+}
+
+/* Implement io_eofnotify as described in <hurd/io.defs>.
+ We don't use this feature. */
+error_t
+S_io_eofnotify (struct protid *cred)
+{
+ if (!cred)
+ return EOPNOTSUPP;
+
+ return 0;
+}
+
+/* Implement io_sigio as described in <hurd/io.defs>.
+ We do this (in theory) but async IO is implemented here yet. */
+error_t
+S_io_sigio (struct protid *cred)
+{
+ if (!cred)
+ return EOPNOTSUPP;
+
+ return 0;
+}
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