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/*
* 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);
}
/*
* When ->drop_inode() is called its return value indicates if the
* inode should be evicted from the inode cache. If the inode is
* unhashed and has no links the default policy is to evict it
* immediately.
*
* Prior to 2.6.36 this eviction was accomplished by the vfs calling
* ->delete_inode(). It was ->delete_inode()'s responsibility to
* truncate the inode pages and call clear_inode(). The call to
* clear_inode() synchronously invalidates all the buffers and
* calls ->clear_inode(). It was ->clear_inode()'s responsibility
* to cleanup and filesystem specific data before freeing the inode.
*
* This elaborate mechanism was replaced by ->evict_inode() which
* does the job of both ->delete_inode() and ->clear_inode(). It
* will be called exactly once, and when it returns the inode must
* be in a state where it can simply be freed. The ->evict_inode()
* callback must minimally truncate the inode pages, and call
* end_writeback() to complete all outstanding writeback for the
* inode. After this is complete evict inode can cleanup any
* remaining filesystem specific data.
*/
#ifdef HAVE_EVICT_INODE
static void
zpl_evict_inode(struct inode *ip)
{
truncate_setsize(ip, 0);
end_writeback(ip);
zfs_inactive(ip);
}
#else
static void
zpl_clear_inode(struct inode *ip)
{
zfs_inactive(ip);
}
static void
zpl_inode_delete(struct inode *ip)
{
truncate_setsize(ip, 0);
clear_inode(ip);
}
#endif /* HAVE_EVICT_INODE */
static void
zpl_put_super(struct super_block *sb)
{
int error;
error = -zfs_umount(sb);
ASSERT3S(error, <=, 0);
}
static int
zpl_sync_fs(struct super_block *sb, int wait)
{
cred_t *cr = CRED();
int error;
crhold(cr);
error = -zfs_sync(sb, wait, cr);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
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_remount_fs(struct super_block *sb, int *flags, char *data)
{
int error;
error = -zfs_remount(sb, flags, data);
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,
.dirty_inode = NULL,
.write_inode = NULL,
.drop_inode = NULL,
#ifdef HAVE_EVICT_INODE
.evict_inode = zpl_evict_inode,
#else
.clear_inode = zpl_clear_inode,
.delete_inode = zpl_inode_delete,
#endif /* HAVE_EVICT_INODE */
.put_super = zpl_put_super,
.write_super = NULL,
.sync_fs = zpl_sync_fs,
.statfs = zpl_statfs,
.remount_fs = zpl_remount_fs,
.show_options = zpl_show_options,
.show_stats = NULL,
};
struct file_system_type zpl_fs_type = {
.owner = THIS_MODULE,
.name = ZFS_DRIVER,
.get_sb = zpl_get_sb,
.kill_sb = zpl_kill_sb,
};
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