573 lines
13 KiB
C
573 lines
13 KiB
C
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/*
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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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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* LLNL-CODE-403049.
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* Rewritten for Linux by:
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* Rohan Puri <rohan.puri15@gmail.com>
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* Brian Behlendorf <behlendorf1@llnl.gov>
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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/zfs_ctldir.h>
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#include <sys/zpl.h>
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/*
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* Common open routine. Disallow any write access.
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*/
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/* ARGSUSED */
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static int
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zpl_common_open(struct inode *ip, struct file *filp)
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{
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if (filp->f_mode & FMODE_WRITE)
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return (-EACCES);
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return (generic_file_open(ip, filp));
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}
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/*
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* Get root directory contents.
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*/
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static int
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zpl_root_iterate(struct file *filp, zpl_dir_context_t *ctx)
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{
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zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp));
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int error = 0;
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ZFS_ENTER(zfsvfs);
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if (!zpl_dir_emit_dots(filp, ctx))
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goto out;
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if (ctx->pos == 2) {
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if (!zpl_dir_emit(ctx, ZFS_SNAPDIR_NAME,
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strlen(ZFS_SNAPDIR_NAME), ZFSCTL_INO_SNAPDIR, DT_DIR))
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goto out;
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ctx->pos++;
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}
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if (ctx->pos == 3) {
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if (!zpl_dir_emit(ctx, ZFS_SHAREDIR_NAME,
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strlen(ZFS_SHAREDIR_NAME), ZFSCTL_INO_SHARES, DT_DIR))
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goto out;
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ctx->pos++;
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}
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out:
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ZFS_EXIT(zfsvfs);
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return (error);
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}
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#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
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static int
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zpl_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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zpl_dir_context_t ctx =
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ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
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int error;
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error = zpl_root_iterate(filp, &ctx);
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filp->f_pos = ctx.pos;
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return (error);
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}
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#endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */
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/*
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* Get root directory attributes.
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*/
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/* ARGSUSED */
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static int
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zpl_root_getattr_impl(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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struct inode *ip = path->dentry->d_inode;
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generic_fillattr(ip, stat);
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stat->atime = current_time(ip);
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return (0);
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}
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ZPL_GETATTR_WRAPPER(zpl_root_getattr);
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static struct dentry *
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#ifdef HAVE_LOOKUP_NAMEIDATA
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zpl_root_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
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#else
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zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
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#endif
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{
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cred_t *cr = CRED();
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struct inode *ip;
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int error;
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crhold(cr);
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error = -zfsctl_root_lookup(dip, dname(dentry), &ip, 0, cr, NULL, NULL);
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ASSERT3S(error, <=, 0);
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crfree(cr);
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if (error) {
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if (error == -ENOENT)
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return (d_splice_alias(NULL, dentry));
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else
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return (ERR_PTR(error));
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}
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return (d_splice_alias(ip, dentry));
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}
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/*
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* The '.zfs' control directory file and inode operations.
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*/
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const struct file_operations zpl_fops_root = {
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.open = zpl_common_open,
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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#ifdef HAVE_VFS_ITERATE_SHARED
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.iterate_shared = zpl_root_iterate,
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#elif defined(HAVE_VFS_ITERATE)
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.iterate = zpl_root_iterate,
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#else
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.readdir = zpl_root_readdir,
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#endif
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};
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const struct inode_operations zpl_ops_root = {
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.lookup = zpl_root_lookup,
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.getattr = zpl_root_getattr,
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};
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#ifdef HAVE_AUTOMOUNT
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static struct vfsmount *
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zpl_snapdir_automount(struct path *path)
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{
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int error;
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error = -zfsctl_snapshot_mount(path, 0);
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if (error)
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return (ERR_PTR(error));
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/*
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* Rather than returning the new vfsmount for the snapshot we must
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* return NULL to indicate a mount collision. This is done because
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* the user space mount calls do_add_mount() which adds the vfsmount
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* to the name space. If we returned the new mount here it would be
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* added again to the vfsmount list resulting in list corruption.
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*/
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return (NULL);
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}
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#endif /* HAVE_AUTOMOUNT */
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/*
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* Negative dentries must always be revalidated so newly created snapshots
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* can be detected and automounted. Normal dentries should be kept because
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* as of the 3.18 kernel revaliding the mountpoint dentry will result in
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* the snapshot being immediately unmounted.
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*/
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static int
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#ifdef HAVE_D_REVALIDATE_NAMEIDATA
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zpl_snapdir_revalidate(struct dentry *dentry, struct nameidata *i)
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#else
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zpl_snapdir_revalidate(struct dentry *dentry, unsigned int flags)
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#endif
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{
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return (!!dentry->d_inode);
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}
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dentry_operations_t zpl_dops_snapdirs = {
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/*
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* Auto mounting of snapshots is only supported for 2.6.37 and
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* newer kernels. Prior to this kernel the ops->follow_link()
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* callback was used as a hack to trigger the mount. The
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* resulting vfsmount was then explicitly grafted in to the
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* name space. While it might be possible to add compatibility
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* code to accomplish this it would require considerable care.
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*/
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#ifdef HAVE_AUTOMOUNT
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.d_automount = zpl_snapdir_automount,
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#endif /* HAVE_AUTOMOUNT */
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.d_revalidate = zpl_snapdir_revalidate,
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};
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static struct dentry *
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#ifdef HAVE_LOOKUP_NAMEIDATA
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zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
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struct nameidata *nd)
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#else
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zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
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unsigned int flags)
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#endif
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{
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fstrans_cookie_t cookie;
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cred_t *cr = CRED();
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struct inode *ip = NULL;
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int error;
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crhold(cr);
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cookie = spl_fstrans_mark();
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error = -zfsctl_snapdir_lookup(dip, dname(dentry), &ip,
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0, cr, NULL, NULL);
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ASSERT3S(error, <=, 0);
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spl_fstrans_unmark(cookie);
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crfree(cr);
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if (error && error != -ENOENT)
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return (ERR_PTR(error));
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ASSERT(error == 0 || ip == NULL);
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d_clear_d_op(dentry);
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d_set_d_op(dentry, &zpl_dops_snapdirs);
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#ifdef HAVE_AUTOMOUNT
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dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
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#endif
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return (d_splice_alias(ip, dentry));
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}
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static int
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zpl_snapdir_iterate(struct file *filp, zpl_dir_context_t *ctx)
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{
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zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp));
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fstrans_cookie_t cookie;
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char snapname[MAXNAMELEN];
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boolean_t case_conflict;
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uint64_t id, pos;
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int error = 0;
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ZFS_ENTER(zfsvfs);
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cookie = spl_fstrans_mark();
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if (!zpl_dir_emit_dots(filp, ctx))
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goto out;
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pos = ctx->pos;
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while (error == 0) {
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dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG);
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error = -dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN,
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snapname, &id, &pos, &case_conflict);
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dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG);
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if (error)
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goto out;
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if (!zpl_dir_emit(ctx, snapname, strlen(snapname),
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ZFSCTL_INO_SHARES - id, DT_DIR))
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goto out;
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ctx->pos = pos;
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}
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out:
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spl_fstrans_unmark(cookie);
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ZFS_EXIT(zfsvfs);
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if (error == -ENOENT)
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return (0);
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return (error);
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}
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#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
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static int
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zpl_snapdir_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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zpl_dir_context_t ctx =
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ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
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int error;
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error = zpl_snapdir_iterate(filp, &ctx);
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filp->f_pos = ctx.pos;
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return (error);
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}
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#endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */
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static int
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zpl_snapdir_rename2(struct inode *sdip, struct dentry *sdentry,
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struct inode *tdip, struct dentry *tdentry, unsigned int flags)
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{
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cred_t *cr = CRED();
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int error;
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/* We probably don't want to support renameat2(2) in ctldir */
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if (flags)
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return (-EINVAL);
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crhold(cr);
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error = -zfsctl_snapdir_rename(sdip, dname(sdentry),
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tdip, dname(tdentry), cr, 0);
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ASSERT3S(error, <=, 0);
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crfree(cr);
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return (error);
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}
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#ifndef HAVE_RENAME_WANTS_FLAGS
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static int
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zpl_snapdir_rename(struct inode *sdip, struct dentry *sdentry,
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struct inode *tdip, struct dentry *tdentry)
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{
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return (zpl_snapdir_rename2(sdip, sdentry, tdip, tdentry, 0));
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}
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#endif
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static int
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zpl_snapdir_rmdir(struct inode *dip, struct dentry *dentry)
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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 = -zfsctl_snapdir_remove(dip, dname(dentry), cr, 0);
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ASSERT3S(error, <=, 0);
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crfree(cr);
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return (error);
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}
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static int
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zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, zpl_umode_t mode)
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{
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cred_t *cr = CRED();
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vattr_t *vap;
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struct inode *ip;
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int error;
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crhold(cr);
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vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
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zpl_vap_init(vap, dip, mode | S_IFDIR, cr);
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error = -zfsctl_snapdir_mkdir(dip, dname(dentry), vap, &ip, cr, 0);
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if (error == 0) {
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d_clear_d_op(dentry);
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d_set_d_op(dentry, &zpl_dops_snapdirs);
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d_instantiate(dentry, ip);
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}
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kmem_free(vap, sizeof (vattr_t));
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ASSERT3S(error, <=, 0);
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crfree(cr);
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return (error);
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}
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/*
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* Get snapshot directory attributes.
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|
*/
|
||
|
|
/* ARGSUSED */
|
||
|
|
static int
|
||
|
|
zpl_snapdir_getattr_impl(const struct path *path, struct kstat *stat,
|
||
|
|
u32 request_mask, unsigned int query_flags)
|
||
|
|
{
|
||
|
|
struct inode *ip = path->dentry->d_inode;
|
||
|
|
zfsvfs_t *zfsvfs = ITOZSB(ip);
|
||
|
|
|
||
|
|
ZFS_ENTER(zfsvfs);
|
||
|
|
generic_fillattr(ip, stat);
|
||
|
|
|
||
|
|
stat->nlink = stat->size = 2;
|
||
|
|
stat->ctime = stat->mtime = dmu_objset_snap_cmtime(zfsvfs->z_os);
|
||
|
|
stat->atime = current_time(ip);
|
||
|
|
ZFS_EXIT(zfsvfs);
|
||
|
|
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
ZPL_GETATTR_WRAPPER(zpl_snapdir_getattr);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The '.zfs/snapshot' directory file operations. These mainly control
|
||
|
|
* generating the list of available snapshots when doing an 'ls' in the
|
||
|
|
* directory. See zpl_snapdir_readdir().
|
||
|
|
*/
|
||
|
|
const struct file_operations zpl_fops_snapdir = {
|
||
|
|
.open = zpl_common_open,
|
||
|
|
.llseek = generic_file_llseek,
|
||
|
|
.read = generic_read_dir,
|
||
|
|
#ifdef HAVE_VFS_ITERATE_SHARED
|
||
|
|
.iterate_shared = zpl_snapdir_iterate,
|
||
|
|
#elif defined(HAVE_VFS_ITERATE)
|
||
|
|
.iterate = zpl_snapdir_iterate,
|
||
|
|
#else
|
||
|
|
.readdir = zpl_snapdir_readdir,
|
||
|
|
#endif
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The '.zfs/snapshot' directory inode operations. These mainly control
|
||
|
|
* creating an inode for a snapshot directory and initializing the needed
|
||
|
|
* infrastructure to automount the snapshot. See zpl_snapdir_lookup().
|
||
|
|
*/
|
||
|
|
const struct inode_operations zpl_ops_snapdir = {
|
||
|
|
.lookup = zpl_snapdir_lookup,
|
||
|
|
.getattr = zpl_snapdir_getattr,
|
||
|
|
#ifdef HAVE_RENAME_WANTS_FLAGS
|
||
|
|
.rename = zpl_snapdir_rename2,
|
||
|
|
#else
|
||
|
|
.rename = zpl_snapdir_rename,
|
||
|
|
#endif
|
||
|
|
.rmdir = zpl_snapdir_rmdir,
|
||
|
|
.mkdir = zpl_snapdir_mkdir,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct dentry *
|
||
|
|
#ifdef HAVE_LOOKUP_NAMEIDATA
|
||
|
|
zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
|
||
|
|
struct nameidata *nd)
|
||
|
|
#else
|
||
|
|
zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
|
||
|
|
unsigned int flags)
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
fstrans_cookie_t cookie;
|
||
|
|
cred_t *cr = CRED();
|
||
|
|
struct inode *ip = NULL;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
crhold(cr);
|
||
|
|
cookie = spl_fstrans_mark();
|
||
|
|
error = -zfsctl_shares_lookup(dip, dname(dentry), &ip,
|
||
|
|
0, cr, NULL, NULL);
|
||
|
|
ASSERT3S(error, <=, 0);
|
||
|
|
spl_fstrans_unmark(cookie);
|
||
|
|
crfree(cr);
|
||
|
|
|
||
|
|
if (error) {
|
||
|
|
if (error == -ENOENT)
|
||
|
|
return (d_splice_alias(NULL, dentry));
|
||
|
|
else
|
||
|
|
return (ERR_PTR(error));
|
||
|
|
}
|
||
|
|
|
||
|
|
return (d_splice_alias(ip, dentry));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
zpl_shares_iterate(struct file *filp, zpl_dir_context_t *ctx)
|
||
|
|
{
|
||
|
|
fstrans_cookie_t cookie;
|
||
|
|
cred_t *cr = CRED();
|
||
|
|
zfsvfs_t *zfsvfs = ITOZSB(file_inode(filp));
|
||
|
|
znode_t *dzp;
|
||
|
|
int error = 0;
|
||
|
|
|
||
|
|
ZFS_ENTER(zfsvfs);
|
||
|
|
cookie = spl_fstrans_mark();
|
||
|
|
|
||
|
|
if (zfsvfs->z_shares_dir == 0) {
|
||
|
|
zpl_dir_emit_dots(filp, ctx);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
error = -zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp);
|
||
|
|
if (error)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
crhold(cr);
|
||
|
|
error = -zfs_readdir(ZTOI(dzp), ctx, cr);
|
||
|
|
crfree(cr);
|
||
|
|
|
||
|
|
iput(ZTOI(dzp));
|
||
|
|
out:
|
||
|
|
spl_fstrans_unmark(cookie);
|
||
|
|
ZFS_EXIT(zfsvfs);
|
||
|
|
ASSERT3S(error, <=, 0);
|
||
|
|
|
||
|
|
return (error);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !defined(HAVE_VFS_ITERATE) && !defined(HAVE_VFS_ITERATE_SHARED)
|
||
|
|
static int
|
||
|
|
zpl_shares_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
||
|
|
{
|
||
|
|
zpl_dir_context_t ctx =
|
||
|
|
ZPL_DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
|
||
|
|
int error;
|
||
|
|
|
||
|
|
error = zpl_shares_iterate(filp, &ctx);
|
||
|
|
filp->f_pos = ctx.pos;
|
||
|
|
|
||
|
|
return (error);
|
||
|
|
}
|
||
|
|
#endif /* !HAVE_VFS_ITERATE && !HAVE_VFS_ITERATE_SHARED */
|
||
|
|
|
||
|
|
/* ARGSUSED */
|
||
|
|
static int
|
||
|
|
zpl_shares_getattr_impl(const struct path *path, struct kstat *stat,
|
||
|
|
u32 request_mask, unsigned int query_flags)
|
||
|
|
{
|
||
|
|
struct inode *ip = path->dentry->d_inode;
|
||
|
|
zfsvfs_t *zfsvfs = ITOZSB(ip);
|
||
|
|
znode_t *dzp;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
ZFS_ENTER(zfsvfs);
|
||
|
|
|
||
|
|
if (zfsvfs->z_shares_dir == 0) {
|
||
|
|
generic_fillattr(path->dentry->d_inode, stat);
|
||
|
|
stat->nlink = stat->size = 2;
|
||
|
|
stat->atime = current_time(ip);
|
||
|
|
ZFS_EXIT(zfsvfs);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
error = -zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp);
|
||
|
|
if (error == 0) {
|
||
|
|
error = -zfs_getattr_fast(ZTOI(dzp), stat);
|
||
|
|
iput(ZTOI(dzp));
|
||
|
|
}
|
||
|
|
|
||
|
|
ZFS_EXIT(zfsvfs);
|
||
|
|
ASSERT3S(error, <=, 0);
|
||
|
|
|
||
|
|
return (error);
|
||
|
|
}
|
||
|
|
ZPL_GETATTR_WRAPPER(zpl_shares_getattr);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The '.zfs/shares' directory file operations.
|
||
|
|
*/
|
||
|
|
const struct file_operations zpl_fops_shares = {
|
||
|
|
.open = zpl_common_open,
|
||
|
|
.llseek = generic_file_llseek,
|
||
|
|
.read = generic_read_dir,
|
||
|
|
#ifdef HAVE_VFS_ITERATE_SHARED
|
||
|
|
.iterate_shared = zpl_shares_iterate,
|
||
|
|
#elif defined(HAVE_VFS_ITERATE)
|
||
|
|
.iterate = zpl_shares_iterate,
|
||
|
|
#else
|
||
|
|
.readdir = zpl_shares_readdir,
|
||
|
|
#endif
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The '.zfs/shares' directory inode operations.
|
||
|
|
*/
|
||
|
|
const struct inode_operations zpl_ops_shares = {
|
||
|
|
.lookup = zpl_shares_lookup,
|
||
|
|
.getattr = zpl_shares_getattr,
|
||
|
|
};
|