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2cf7f52bc4
The .get_sb callback has been replaced by a .mount callback in the file_system_type structure. When using the new interface the caller must now use the mount_nodev() helper. Unfortunately, the new interface no longer passes the vfsmount down to the zfs layers. This poses a problem for the existing implementation because we currently save this pointer in the super block for latter use. It provides our only entry point in to the namespace layer for manipulating certain mount options. This needed to be done originally to allow commands like 'zfs set atime=off tank' to work properly. It also allowed me to keep more of the original Solaris code unmodified. Under Solaris there is a 1-to-1 mapping between a mount point and a file system so this is a fairly natural thing to do. However, under Linux they many be multiple entries in the namespace which reference the same filesystem. Thus keeping a back reference from the filesystem to the namespace is complicated. Rather than introduce some ugly hack to get the vfsmount and continue as before. I'm leveraging this API change to update the ZFS code to do things in a more natural way for Linux. This has the upside that is resolves the compatibility issue for the long term and fixes several other minor bugs which have been reported. This commit updates the code to remove this vfsmount back reference entirely. All modifications to filesystem mount options are now passed in to the kernel via a '-o remount'. This is the expected Linux mechanism and allows the namespace to properly handle any options which apply to it before passing them on to the file system itself. Aside from fixing the compatibility issue, removing the vfsmount has had the benefit of simplifying the code. This change which fairly involved has turned out nicely. Closes #246 Closes #217 Closes #187 Closes #248 Closes #231
101 lines
4.8 KiB
C
101 lines
4.8 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 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
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* All Rights Reserved
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*/
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#ifndef _SYS_MNTENT_H
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#define _SYS_MNTENT_H
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#define MNTTYPE_ZFS "zfs" /* ZFS file system */
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#define MOUNT_SUCCESS 0x00 /* Success */
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#define MOUNT_USAGE 0x01 /* Invalid invocation or permissions */
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#define MOUNT_SYSERR 0x02 /* System error (ENOMEM, etc) */
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#define MOUNT_SOFTWARE 0x04 /* Internal mount bug */
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#define MOUNT_USER 0x08 /* Interrupted by user (EINTR) */
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#define MOUNT_FILEIO 0x10 /* Error updating/locking /etc/mtab */
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#define MOUNT_FAIL 0x20 /* Mount failed */
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#define MOUNT_SOMEOK 0x40 /* At least on mount succeeded */
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#define MNTOPT_ASYNC "async" /* all I/O is asynchronous */
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#define MNTOPT_ATIME "atime" /* update atime for files */
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#define MNTOPT_NOATIME "noatime" /* do not update atime for files */
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#define MNTOPT_AUTO "auto" /* automount */
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#define MNTOPT_NOAUTO "noauto" /* do not automount */
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#define MNTOPT_CONTEXT "context" /* selinux context */
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#define MNTOPT_NOCONTEXT "nocontext" /* No selinux context (zfs-only) */
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#define MNTOPT_FSCONTEXT "fscontext" /* selinux fscontext */
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#define MNTOPT_DEFCONTEXT "defcontext" /* selinux defcontext */
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#define MNTOPT_ROOTCONTEXT "rootcontext" /* selinux rootcontext */
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#define MNTOPT_DEFAULTS "defaults" /* defaults */
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#define MNTOPT_DEVICES "dev" /* device-special allowed */
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#define MNTOPT_NODEVICES "nodev" /* device-special disallowed */
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#define MNTOPT_DIRATIME "diratime" /* update atime for dirs */
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#define MNTOPT_NODIRATIME "nodiratime" /* do not update atime for dirs */
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#define MNTOPT_DIRSYNC "dirsync" /* do dir updates synchronously */
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#define MNTOPT_EXEC "exec" /* enable executables */
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#define MNTOPT_NOEXEC "noexec" /* disable executables */
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#define MNTOPT_GROUP "group" /* allow group mount */
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#define MNTOPT_NOGROUP "nogroup" /* do not allow group mount */
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#define MNTOPT_IVERSION "iversion" /* update inode version */
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#define MNTOPT_NOIVERSION "noiversion" /* do not update inode version */
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#define MNTOPT_NBMAND "mand" /* allow non-blocking mandatory locks */
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#define MNTOPT_NONBMAND "nomand" /* deny non-blocking mandatory locks */
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#define MNTOPT_NETDEV "_netdev" /* network device */
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#define MNTOPT_NOFAIL "nofail" /* no failure */
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#define MNTOPT_RELATIME "relatime" /* allow relative time updates */
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#define MNTOPT_NORELATIME "norelatime" /* do not allow relative time updates */
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#define MNTOPT_DFRATIME "strictatime" /* Deferred access time updates */
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#define MNTOPT_NODFRATIME "nostrictatime" /* No Deferred access time updates */
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#define MNTOPT_SETUID "suid" /* Both setuid and devices allowed */
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#define MNTOPT_NOSETUID "nosuid" /* Neither setuid nor devices allowed */
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#define MNTOPT_OWNER "owner" /* allow owner mount */
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#define MNTOPT_NOOWNER "noowner" /* do not allow owner mount */
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#define MNTOPT_REMOUNT "remount" /* change mount options */
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#define MNTOPT_RO "ro" /* read only */
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#define MNTOPT_RW "rw" /* read/write */
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#define MNTOPT_SYNC "sync" /* all I/O is synchronous */
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#define MNTOPT_USER "user" /* allow user mount */
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#define MNTOPT_NOUSER "nouser" /* do not allow user mount */
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#define MNTOPT_USERS "users" /* allow user mount */
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#define MNTOPT_NOUSERS "nousers" /* do not allow user mount */
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#define MNTOPT_SUB "sub" /* allow mounts on subdirs */
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#define MNTOPT_NOSUB "nosub" /* do not allow mounts on subdirs */
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#define MNTOPT_QUIET "quiet" /* quiet mount */
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#define MNTOPT_LOUD "loud" /* verbose mount */
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#define MNTOPT_BIND "bind" /* remount part of a tree */
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#define MNTOPT_RBIND "rbind" /* include subtrees */
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#define MNTOPT_XATTR "xattr" /* enable extended attributes */
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#define MNTOPT_NOXATTR "noxattr" /* disable extended attributes */
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#define MNTOPT_COMMENT "comment" /* comment */
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#define MNTOPT_ZFSUTIL "zfsutil" /* called by zfs utility */
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#define ZS_COMMENT 0x00000000 /* comment */
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#define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */
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#define ZS_NOCONTEXT 0x00000002 /* do not add selinux context */
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#endif /* _SYS_MNTENT_H */
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