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authorBrian Behlendorf <[email protected]>2011-01-26 12:09:10 -0800
committerBrian Behlendorf <[email protected]>2011-02-10 09:27:21 -0800
commit51f0bbe425f7313a19ee54ccd3d67ed8ba686567 (patch)
treecaab9776de577fbf5114204bd6d07fddc75418f1
parentee154f01bf0bdb5e85524c518c19964272d33cd9 (diff)
Add Hooks for Linux Super Block Operations
The Linux specific super block operations have all been located in the file zpl_super.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
-rw-r--r--module/zfs/zpl_super.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/module/zfs/zpl_super.c b/module/zfs/zpl_super.c
new file mode 100644
index 000000000..bbb7beaf3
--- /dev/null
+++ b/module/zfs/zpl_super.c
@@ -0,0 +1,168 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
+ */
+
+
+#include <sys/zfs_vfsops.h>
+#include <sys/zfs_vnops.h>
+#include <sys/zfs_znode.h>
+#include <sys/zpl.h>
+
+
+static struct inode *
+zpl_inode_alloc(struct super_block *sb)
+{
+ struct inode *ip;
+
+ VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0);
+ ip->i_version = 1;
+
+ return (ip);
+}
+
+static void
+zpl_inode_destroy(struct inode *ip)
+{
+ ASSERT(atomic_read(&ip->i_count) == 0);
+ zfs_inode_destroy(ip);
+}
+
+static void
+zpl_inode_delete(struct inode *ip)
+{
+ loff_t oldsize = i_size_read(ip);
+
+ i_size_write(ip, 0);
+ truncate_pagecache(ip, oldsize, 0);
+ clear_inode(ip);
+}
+
+static void
+zpl_evict_inode(struct inode *ip)
+{
+ zfs_inactive(ip);
+}
+
+static void
+zpl_put_super(struct super_block *sb)
+{
+ int error;
+
+ error = -zfs_umount(sb);
+ ASSERT3S(error, <=, 0);
+}
+
+static int
+zpl_statfs(struct dentry *dentry, struct kstatfs *statp)
+{
+ int error;
+
+ error = -zfs_statvfs(dentry, statp);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
+{
+ struct super_block *sb = vfsp->mnt_sb;
+ zfs_sb_t *zsb = sb->s_fs_info;
+
+ /*
+ * The Linux VFS automatically handles the following flags:
+ * MNT_NOSUID, MNT_NODEV, MNT_NOEXEC, MNT_NOATIME, MNT_READONLY
+ */
+
+ if (zsb->z_flags & ZSB_XATTR_USER)
+ seq_printf(seq, ",%s", "xattr");
+
+ return (0);
+}
+
+static int
+zpl_fill_super(struct super_block *sb, void *data, int silent)
+{
+ int error;
+
+ error = -zfs_domount(sb, data, silent);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_get_sb(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data, struct vfsmount *mnt)
+{
+ zpl_mount_data_t zmd = { osname, data, mnt };
+
+ return get_sb_nodev(fs_type, flags, &zmd, zpl_fill_super, mnt);
+}
+
+static void
+zpl_kill_sb(struct super_block *sb)
+{
+#ifdef HAVE_SNAPSHOT
+ zfs_sb_t *zsb = sb->s_fs_info;
+
+ if (zsb && dmu_objset_is_snapshot(zsb->z_os))
+ zfs_snap_destroy(zsb);
+#endif /* HAVE_SNAPSHOT */
+
+ kill_anon_super(sb);
+}
+
+const struct super_operations zpl_super_operations = {
+ .alloc_inode = zpl_inode_alloc,
+ .destroy_inode = zpl_inode_destroy,
+ .delete_inode = zpl_inode_delete,
+ .dirty_inode = NULL,
+ .write_inode = NULL,
+ .drop_inode = NULL,
+ .clear_inode = zpl_evict_inode,
+ .put_super = zpl_put_super,
+ .write_super = NULL,
+ .sync_fs = NULL,
+ .freeze_fs = NULL,
+ .unfreeze_fs = NULL,
+ .statfs = zpl_statfs,
+ .remount_fs = NULL,
+ .show_options = zpl_show_options,
+ .show_stats = NULL,
+};
+
+#if 0
+const struct export_operations zpl_export_operations = {
+ .fh_to_dentry = NULL,
+ .fh_to_parent = NULL,
+ .get_parent = NULL,
+};
+#endif
+
+struct file_system_type zpl_fs_type = {
+ .owner = THIS_MODULE,
+ .name = ZFS_DRIVER,
+ .get_sb = zpl_get_sb,
+ .kill_sb = zpl_kill_sb,
+};