055656d4f4
Implemented the required NFS operations for exporting ZFS datasets using the in-kernel NFS daemon.
219 lines
5.0 KiB
C
219 lines
5.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
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*/
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#include <sys/zfs_vfsops.h>
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#include <sys/zfs_vnops.h>
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#include <sys/zfs_znode.h>
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#include <sys/zpl.h>
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static struct inode *
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zpl_inode_alloc(struct super_block *sb)
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{
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struct inode *ip;
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VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0);
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ip->i_version = 1;
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return (ip);
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}
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static void
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zpl_inode_destroy(struct inode *ip)
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{
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ASSERT(atomic_read(&ip->i_count) == 0);
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zfs_inode_destroy(ip);
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}
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/*
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* When ->drop_inode() is called its return value indicates if the
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* inode should be evicted from the inode cache. If the inode is
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* unhashed and has no links the default policy is to evict it
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* immediately.
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*
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* Prior to 2.6.36 this eviction was accomplished by the vfs calling
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* ->delete_inode(). It was ->delete_inode()'s responsibility to
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* truncate the inode pages and call clear_inode(). The call to
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* clear_inode() synchronously invalidates all the buffers and
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* calls ->clear_inode(). It was ->clear_inode()'s responsibility
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* to cleanup and filesystem specific data before freeing the inode.
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*
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* This elaborate mechanism was replaced by ->evict_inode() which
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* does the job of both ->delete_inode() and ->clear_inode(). It
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* will be called exactly once, and when it returns the inode must
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* be in a state where it can simply be freed. The ->evict_inode()
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* callback must minimally truncate the inode pages, and call
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* end_writeback() to complete all outstanding writeback for the
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* inode. After this is complete evict inode can cleanup any
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* remaining filesystem specific data.
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*/
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#ifdef HAVE_EVICT_INODE
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static void
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zpl_evict_inode(struct inode *ip)
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{
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truncate_inode_pages(&ip->i_data, 0);
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end_writeback(ip);
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zfs_inactive(ip);
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}
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#else
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static void
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zpl_clear_inode(struct inode *ip)
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{
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zfs_inactive(ip);
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}
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static void
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zpl_inode_delete(struct inode *ip)
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{
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truncate_inode_pages(&ip->i_data, 0);
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clear_inode(ip);
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}
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#endif /* HAVE_EVICT_INODE */
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static void
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zpl_put_super(struct super_block *sb)
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{
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int error;
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error = -zfs_umount(sb);
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ASSERT3S(error, <=, 0);
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}
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static int
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zpl_sync_fs(struct super_block *sb, int wait)
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{
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cred_t *cr = CRED();
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int error;
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crhold(cr);
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error = -zfs_sync(sb, wait, cr);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_statfs(struct dentry *dentry, struct kstatfs *statp)
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{
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int error;
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error = -zfs_statvfs(dentry, statp);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_remount_fs(struct super_block *sb, int *flags, char *data)
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{
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int error;
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error = -zfs_remount(sb, flags, data);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
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{
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struct super_block *sb = vfsp->mnt_sb;
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zfs_sb_t *zsb = sb->s_fs_info;
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/*
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* The Linux VFS automatically handles the following flags:
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* MNT_NOSUID, MNT_NODEV, MNT_NOEXEC, MNT_NOATIME, MNT_READONLY
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*/
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if (zsb->z_flags & ZSB_XATTR_USER)
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seq_printf(seq, ",%s", "xattr");
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return (0);
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}
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static int
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zpl_fill_super(struct super_block *sb, void *data, int silent)
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{
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int error;
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error = -zfs_domount(sb, data, silent);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_get_sb(struct file_system_type *fs_type, int flags,
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const char *osname, void *data, struct vfsmount *mnt)
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{
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zpl_mount_data_t zmd = { osname, data, mnt };
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return get_sb_nodev(fs_type, flags, &zmd, zpl_fill_super, mnt);
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}
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static void
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zpl_kill_sb(struct super_block *sb)
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{
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#ifdef HAVE_SNAPSHOT
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zfs_sb_t *zsb = sb->s_fs_info;
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if (zsb && dmu_objset_is_snapshot(zsb->z_os))
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zfs_snap_destroy(zsb);
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#endif /* HAVE_SNAPSHOT */
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kill_anon_super(sb);
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}
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const struct super_operations zpl_super_operations = {
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.alloc_inode = zpl_inode_alloc,
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.destroy_inode = zpl_inode_destroy,
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.dirty_inode = NULL,
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.write_inode = NULL,
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.drop_inode = NULL,
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#ifdef HAVE_EVICT_INODE
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.evict_inode = zpl_evict_inode,
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#else
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.clear_inode = zpl_clear_inode,
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.delete_inode = zpl_inode_delete,
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#endif /* HAVE_EVICT_INODE */
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.put_super = zpl_put_super,
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.write_super = NULL,
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.sync_fs = zpl_sync_fs,
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.statfs = zpl_statfs,
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.remount_fs = zpl_remount_fs,
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.show_options = zpl_show_options,
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.show_stats = NULL,
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};
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struct file_system_type zpl_fs_type = {
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.owner = THIS_MODULE,
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.name = ZFS_DRIVER,
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.get_sb = zpl_get_sb,
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.kill_sb = zpl_kill_sb,
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};
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