mirror of https://gitee.com/openkylin/linux.git
1187 lines
27 KiB
C
1187 lines
27 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/namei.h>
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#include <linux/utsname.h>
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#include <linux/mm.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/lm_interface.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
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#include "bmap.h"
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#include "dir.h"
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#include "eaops.h"
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#include "eattr.h"
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#include "glock.h"
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#include "inode.h"
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#include "meta_io.h"
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#include "ops_dentry.h"
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#include "ops_inode.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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/**
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* gfs2_create - Create a file
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* @dir: The directory in which to create the file
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* @dentry: The dentry of the new file
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* @mode: The mode of the new file
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*
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* Returns: errno
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*/
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static int gfs2_create(struct inode *dir, struct dentry *dentry,
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int mode, struct nameidata *nd)
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{
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct gfs2_holder ghs[2];
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struct inode *inode;
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gfs2_holder_init(dip->i_gl, 0, 0, ghs);
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for (;;) {
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inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
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if (!IS_ERR(inode)) {
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gfs2_trans_end(sdp);
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if (dip->i_alloc->al_rgd)
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gfs2_inplace_release(dip);
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gfs2_quota_unlock(dip);
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gfs2_alloc_put(dip);
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gfs2_glock_dq_uninit_m(2, ghs);
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mark_inode_dirty(inode);
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break;
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} else if (PTR_ERR(inode) != -EEXIST ||
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(nd && (nd->intent.open.flags & O_EXCL))) {
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gfs2_holder_uninit(ghs);
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return PTR_ERR(inode);
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}
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inode = gfs2_lookupi(dir, &dentry->d_name, 0);
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if (inode) {
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if (!IS_ERR(inode)) {
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gfs2_holder_uninit(ghs);
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break;
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} else {
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gfs2_holder_uninit(ghs);
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return PTR_ERR(inode);
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}
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}
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}
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d_instantiate(dentry, inode);
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return 0;
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}
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/**
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* gfs2_lookup - Look up a filename in a directory and return its inode
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* @dir: The directory inode
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* @dentry: The dentry of the new inode
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* @nd: passed from Linux VFS, ignored by us
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*
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* Called by the VFS layer. Lock dir and call gfs2_lookupi()
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*
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* Returns: errno
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*/
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static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct inode *inode = NULL;
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dentry->d_op = &gfs2_dops;
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inode = gfs2_lookupi(dir, &dentry->d_name, 0);
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if (inode && IS_ERR(inode))
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return ERR_CAST(inode);
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if (inode) {
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struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
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struct gfs2_holder gh;
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int error;
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error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
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if (error) {
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iput(inode);
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return ERR_PTR(error);
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}
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gfs2_glock_dq_uninit(&gh);
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return d_splice_alias(inode, dentry);
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}
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d_add(dentry, inode);
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return NULL;
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}
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/**
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* gfs2_link - Link to a file
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* @old_dentry: The inode to link
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* @dir: Add link to this directory
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* @dentry: The name of the link
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*
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* Link the inode in "old_dentry" into the directory "dir" with the
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* name in "dentry".
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*
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* Returns: errno
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*/
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static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct inode *inode = old_dentry->d_inode;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder ghs[2];
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int alloc_required;
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int error;
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if (S_ISDIR(inode->i_mode))
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return -EPERM;
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gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
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error = gfs2_glock_nq_m(2, ghs);
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if (error)
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goto out;
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error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
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if (error)
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goto out_gunlock;
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error = gfs2_dir_check(dir, &dentry->d_name, NULL);
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switch (error) {
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case -ENOENT:
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break;
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case 0:
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error = -EEXIST;
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default:
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goto out_gunlock;
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}
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error = -EINVAL;
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if (!dip->i_inode.i_nlink)
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goto out_gunlock;
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error = -EFBIG;
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if (dip->i_di.di_entries == (u32)-1)
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goto out_gunlock;
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error = -EPERM;
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if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
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goto out_gunlock;
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error = -EINVAL;
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if (!ip->i_inode.i_nlink)
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goto out_gunlock;
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error = -EMLINK;
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if (ip->i_inode.i_nlink == (u32)-1)
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goto out_gunlock;
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alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
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if (error < 0)
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goto out_gunlock;
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error = 0;
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if (alloc_required) {
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struct gfs2_alloc *al = gfs2_alloc_get(dip);
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if (!al) {
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error = -ENOMEM;
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goto out_gunlock;
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}
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error = gfs2_quota_lock_check(dip);
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if (error)
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goto out_alloc;
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al->al_requested = sdp->sd_max_dirres;
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error = gfs2_inplace_reserve(dip);
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if (error)
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goto out_gunlock_q;
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error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
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al->al_rgd->rd_length +
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2 * RES_DINODE + RES_STATFS +
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RES_QUOTA, 0);
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if (error)
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goto out_ipres;
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} else {
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error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
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if (error)
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goto out_ipres;
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}
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error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
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if (error)
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goto out_end_trans;
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error = gfs2_change_nlink(ip, +1);
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out_end_trans:
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gfs2_trans_end(sdp);
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out_ipres:
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if (alloc_required)
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gfs2_inplace_release(dip);
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out_gunlock_q:
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if (alloc_required)
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gfs2_quota_unlock(dip);
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out_alloc:
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if (alloc_required)
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gfs2_alloc_put(dip);
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out_gunlock:
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gfs2_glock_dq_m(2, ghs);
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out:
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gfs2_holder_uninit(ghs);
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gfs2_holder_uninit(ghs + 1);
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if (!error) {
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atomic_inc(&inode->i_count);
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d_instantiate(dentry, inode);
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mark_inode_dirty(inode);
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}
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return error;
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}
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/**
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* gfs2_unlink - Unlink a file
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* @dir: The inode of the directory containing the file to unlink
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* @dentry: The file itself
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*
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* Unlink a file. Call gfs2_unlinki()
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*
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* Returns: errno
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*/
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static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
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struct gfs2_holder ghs[3];
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struct gfs2_rgrpd *rgd;
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struct gfs2_holder ri_gh;
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int error;
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error = gfs2_rindex_hold(sdp, &ri_gh);
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if (error)
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return error;
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gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
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rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
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gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
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error = gfs2_glock_nq(ghs); /* parent */
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if (error)
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goto out_parent;
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error = gfs2_glock_nq(ghs + 1); /* child */
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if (error)
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goto out_child;
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error = gfs2_glock_nq(ghs + 2); /* rgrp */
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if (error)
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goto out_rgrp;
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error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
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if (error)
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goto out_rgrp;
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error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
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if (error)
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goto out_rgrp;
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error = gfs2_dir_del(dip, &dentry->d_name);
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if (error)
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goto out_end_trans;
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error = gfs2_change_nlink(ip, -1);
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out_end_trans:
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gfs2_trans_end(sdp);
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gfs2_glock_dq(ghs + 2);
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out_rgrp:
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gfs2_holder_uninit(ghs + 2);
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gfs2_glock_dq(ghs + 1);
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out_child:
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gfs2_holder_uninit(ghs + 1);
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gfs2_glock_dq(ghs);
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out_parent:
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gfs2_holder_uninit(ghs);
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gfs2_glock_dq_uninit(&ri_gh);
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return error;
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}
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/**
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* gfs2_symlink - Create a symlink
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* @dir: The directory to create the symlink in
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* @dentry: The dentry to put the symlink in
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* @symname: The thing which the link points to
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*
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* Returns: errno
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*/
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static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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struct gfs2_inode *dip = GFS2_I(dir), *ip;
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct gfs2_holder ghs[2];
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struct inode *inode;
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struct buffer_head *dibh;
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int size;
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int error;
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/* Must be stuffed with a null terminator for gfs2_follow_link() */
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size = strlen(symname);
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if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
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return -ENAMETOOLONG;
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gfs2_holder_init(dip->i_gl, 0, 0, ghs);
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inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
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if (IS_ERR(inode)) {
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gfs2_holder_uninit(ghs);
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return PTR_ERR(inode);
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}
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ip = ghs[1].gh_gl->gl_object;
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ip->i_di.di_size = size;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (!gfs2_assert_withdraw(sdp, !error)) {
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gfs2_dinode_out(ip, dibh->b_data);
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memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
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size);
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brelse(dibh);
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}
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gfs2_trans_end(sdp);
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if (dip->i_alloc->al_rgd)
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gfs2_inplace_release(dip);
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gfs2_quota_unlock(dip);
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gfs2_alloc_put(dip);
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gfs2_glock_dq_uninit_m(2, ghs);
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d_instantiate(dentry, inode);
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mark_inode_dirty(inode);
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return 0;
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}
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/**
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* gfs2_mkdir - Make a directory
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* @dir: The parent directory of the new one
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* @dentry: The dentry of the new directory
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* @mode: The mode of the new directory
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*
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* Returns: errno
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*/
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static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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{
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struct gfs2_inode *dip = GFS2_I(dir), *ip;
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct gfs2_holder ghs[2];
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struct inode *inode;
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struct buffer_head *dibh;
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int error;
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gfs2_holder_init(dip->i_gl, 0, 0, ghs);
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inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
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if (IS_ERR(inode)) {
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gfs2_holder_uninit(ghs);
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return PTR_ERR(inode);
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}
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ip = ghs[1].gh_gl->gl_object;
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ip->i_inode.i_nlink = 2;
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ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
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ip->i_di.di_flags |= GFS2_DIF_JDATA;
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ip->i_di.di_entries = 2;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (!gfs2_assert_withdraw(sdp, !error)) {
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struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
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struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
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struct qstr str;
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gfs2_str2qstr(&str, ".");
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
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dent->de_inum = di->di_num; /* already GFS2 endian */
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dent->de_type = cpu_to_be16(DT_DIR);
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di->di_entries = cpu_to_be32(1);
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gfs2_str2qstr(&str, "..");
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dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
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gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
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gfs2_inum_out(dip, dent);
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dent->de_type = cpu_to_be16(DT_DIR);
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gfs2_dinode_out(ip, di);
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brelse(dibh);
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}
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|
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error = gfs2_change_nlink(dip, +1);
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gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
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|
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gfs2_trans_end(sdp);
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if (dip->i_alloc->al_rgd)
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gfs2_inplace_release(dip);
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gfs2_quota_unlock(dip);
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gfs2_alloc_put(dip);
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gfs2_glock_dq_uninit_m(2, ghs);
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d_instantiate(dentry, inode);
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mark_inode_dirty(inode);
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|
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return 0;
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}
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|
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/**
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* gfs2_rmdir - Remove a directory
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* @dir: The parent directory of the directory to be removed
|
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* @dentry: The dentry of the directory to remove
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*
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* Remove a directory. Call gfs2_rmdiri()
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*
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* Returns: errno
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*/
|
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|
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static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_sbd *sdp = GFS2_SB(dir);
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struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
|
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struct gfs2_holder ghs[3];
|
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struct gfs2_rgrpd *rgd;
|
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struct gfs2_holder ri_gh;
|
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int error;
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|
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error = gfs2_rindex_hold(sdp, &ri_gh);
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if (error)
|
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return error;
|
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gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
|
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
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|
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rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
|
|
gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
|
|
|
|
error = gfs2_glock_nq_m(3, ghs);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
if (ip->i_di.di_entries < 2) {
|
|
if (gfs2_consist_inode(ip))
|
|
gfs2_dinode_print(ip);
|
|
error = -EIO;
|
|
goto out_gunlock;
|
|
}
|
|
if (ip->i_di.di_entries > 2) {
|
|
error = -ENOTEMPTY;
|
|
goto out_gunlock;
|
|
}
|
|
|
|
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
error = gfs2_rmdiri(dip, &dentry->d_name, ip);
|
|
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_gunlock:
|
|
gfs2_glock_dq_m(3, ghs);
|
|
out:
|
|
gfs2_holder_uninit(ghs);
|
|
gfs2_holder_uninit(ghs + 1);
|
|
gfs2_holder_uninit(ghs + 2);
|
|
gfs2_glock_dq_uninit(&ri_gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_mknod - Make a special file
|
|
* @dir: The directory in which the special file will reside
|
|
* @dentry: The dentry of the special file
|
|
* @mode: The mode of the special file
|
|
* @rdev: The device specification of the special file
|
|
*
|
|
*/
|
|
|
|
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
|
|
dev_t dev)
|
|
{
|
|
struct gfs2_inode *dip = GFS2_I(dir);
|
|
struct gfs2_sbd *sdp = GFS2_SB(dir);
|
|
struct gfs2_holder ghs[2];
|
|
struct inode *inode;
|
|
|
|
gfs2_holder_init(dip->i_gl, 0, 0, ghs);
|
|
|
|
inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
|
|
if (IS_ERR(inode)) {
|
|
gfs2_holder_uninit(ghs);
|
|
return PTR_ERR(inode);
|
|
}
|
|
|
|
gfs2_trans_end(sdp);
|
|
if (dip->i_alloc->al_rgd)
|
|
gfs2_inplace_release(dip);
|
|
gfs2_quota_unlock(dip);
|
|
gfs2_alloc_put(dip);
|
|
|
|
gfs2_glock_dq_uninit_m(2, ghs);
|
|
|
|
d_instantiate(dentry, inode);
|
|
mark_inode_dirty(inode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_rename - Rename a file
|
|
* @odir: Parent directory of old file name
|
|
* @odentry: The old dentry of the file
|
|
* @ndir: Parent directory of new file name
|
|
* @ndentry: The new dentry of the file
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_rename(struct inode *odir, struct dentry *odentry,
|
|
struct inode *ndir, struct dentry *ndentry)
|
|
{
|
|
struct gfs2_inode *odip = GFS2_I(odir);
|
|
struct gfs2_inode *ndip = GFS2_I(ndir);
|
|
struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
|
|
struct gfs2_inode *nip = NULL;
|
|
struct gfs2_sbd *sdp = GFS2_SB(odir);
|
|
struct gfs2_holder ghs[5], r_gh;
|
|
struct gfs2_rgrpd *nrgd;
|
|
unsigned int num_gh;
|
|
int dir_rename = 0;
|
|
int alloc_required;
|
|
unsigned int x;
|
|
int error;
|
|
|
|
if (ndentry->d_inode) {
|
|
nip = GFS2_I(ndentry->d_inode);
|
|
if (ip == nip)
|
|
return 0;
|
|
}
|
|
|
|
/* Make sure we aren't trying to move a dirctory into it's subdir */
|
|
|
|
if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
|
|
dir_rename = 1;
|
|
|
|
error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
|
|
&r_gh);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_ok_to_move(ip, ndip);
|
|
if (error)
|
|
goto out_gunlock_r;
|
|
}
|
|
|
|
num_gh = 1;
|
|
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
|
|
if (odip != ndip) {
|
|
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
|
|
num_gh++;
|
|
}
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
|
|
num_gh++;
|
|
|
|
if (nip) {
|
|
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
|
|
num_gh++;
|
|
/* grab the resource lock for unlink flag twiddling
|
|
* this is the case of the target file already existing
|
|
* so we unlink before doing the rename
|
|
*/
|
|
nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
|
|
if (nrgd)
|
|
gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
|
|
}
|
|
|
|
error = gfs2_glock_nq_m(num_gh, ghs);
|
|
if (error)
|
|
goto out_uninit;
|
|
|
|
/* Check out the old directory */
|
|
|
|
error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
/* Check out the new directory */
|
|
|
|
if (nip) {
|
|
error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
if (S_ISDIR(nip->i_inode.i_mode)) {
|
|
if (nip->i_di.di_entries < 2) {
|
|
if (gfs2_consist_inode(nip))
|
|
gfs2_dinode_print(nip);
|
|
error = -EIO;
|
|
goto out_gunlock;
|
|
}
|
|
if (nip->i_di.di_entries > 2) {
|
|
error = -ENOTEMPTY;
|
|
goto out_gunlock;
|
|
}
|
|
}
|
|
} else {
|
|
error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
|
|
switch (error) {
|
|
case -ENOENT:
|
|
error = 0;
|
|
break;
|
|
case 0:
|
|
error = -EEXIST;
|
|
default:
|
|
goto out_gunlock;
|
|
};
|
|
|
|
if (odip != ndip) {
|
|
if (!ndip->i_inode.i_nlink) {
|
|
error = -EINVAL;
|
|
goto out_gunlock;
|
|
}
|
|
if (ndip->i_di.di_entries == (u32)-1) {
|
|
error = -EFBIG;
|
|
goto out_gunlock;
|
|
}
|
|
if (S_ISDIR(ip->i_inode.i_mode) &&
|
|
ndip->i_inode.i_nlink == (u32)-1) {
|
|
error = -EMLINK;
|
|
goto out_gunlock;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check out the dir to be renamed */
|
|
|
|
if (dir_rename) {
|
|
error = gfs2_permission(odentry->d_inode, MAY_WRITE);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
|
|
alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
|
|
if (error < 0)
|
|
goto out_gunlock;
|
|
error = 0;
|
|
|
|
if (alloc_required) {
|
|
struct gfs2_alloc *al = gfs2_alloc_get(ndip);
|
|
if (!al) {
|
|
error = -ENOMEM;
|
|
goto out_gunlock;
|
|
}
|
|
|
|
error = gfs2_quota_lock_check(ndip);
|
|
if (error)
|
|
goto out_alloc;
|
|
|
|
al->al_requested = sdp->sd_max_dirres;
|
|
|
|
error = gfs2_inplace_reserve(ndip);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
|
|
al->al_rgd->rd_length +
|
|
4 * RES_DINODE + 4 * RES_LEAF +
|
|
RES_STATFS + RES_QUOTA + 4, 0);
|
|
if (error)
|
|
goto out_ipreserv;
|
|
} else {
|
|
error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
|
|
5 * RES_LEAF + 4, 0);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
|
|
/* Remove the target file, if it exists */
|
|
|
|
if (nip) {
|
|
if (S_ISDIR(nip->i_inode.i_mode))
|
|
error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
|
|
else {
|
|
error = gfs2_dir_del(ndip, &ndentry->d_name);
|
|
if (error)
|
|
goto out_end_trans;
|
|
error = gfs2_change_nlink(nip, -1);
|
|
}
|
|
if (error)
|
|
goto out_end_trans;
|
|
}
|
|
|
|
if (dir_rename) {
|
|
struct qstr name;
|
|
gfs2_str2qstr(&name, "..");
|
|
|
|
error = gfs2_change_nlink(ndip, +1);
|
|
if (error)
|
|
goto out_end_trans;
|
|
error = gfs2_change_nlink(odip, -1);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
|
|
if (error)
|
|
goto out_end_trans;
|
|
} else {
|
|
struct buffer_head *dibh;
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
ip->i_inode.i_ctime = CURRENT_TIME;
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(ip, dibh->b_data);
|
|
brelse(dibh);
|
|
}
|
|
|
|
error = gfs2_dir_del(odip, &odentry->d_name);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
out_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
out_ipreserv:
|
|
if (alloc_required)
|
|
gfs2_inplace_release(ndip);
|
|
out_gunlock_q:
|
|
if (alloc_required)
|
|
gfs2_quota_unlock(ndip);
|
|
out_alloc:
|
|
if (alloc_required)
|
|
gfs2_alloc_put(ndip);
|
|
out_gunlock:
|
|
gfs2_glock_dq_m(num_gh, ghs);
|
|
out_uninit:
|
|
for (x = 0; x < num_gh; x++)
|
|
gfs2_holder_uninit(ghs + x);
|
|
out_gunlock_r:
|
|
if (dir_rename)
|
|
gfs2_glock_dq_uninit(&r_gh);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_readlink - Read the value of a symlink
|
|
* @dentry: the symlink
|
|
* @buf: the buffer to read the symlink data into
|
|
* @size: the size of the buffer
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
|
|
int user_size)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
|
|
char array[GFS2_FAST_NAME_SIZE], *buf = array;
|
|
unsigned int len = GFS2_FAST_NAME_SIZE;
|
|
int error;
|
|
|
|
error = gfs2_readlinki(ip, &buf, &len);
|
|
if (error)
|
|
return error;
|
|
|
|
if (user_size > len - 1)
|
|
user_size = len - 1;
|
|
|
|
if (copy_to_user(user_buf, buf, user_size))
|
|
error = -EFAULT;
|
|
else
|
|
error = user_size;
|
|
|
|
if (buf != array)
|
|
kfree(buf);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_follow_link - Follow a symbolic link
|
|
* @dentry: The dentry of the link
|
|
* @nd: Data that we pass to vfs_follow_link()
|
|
*
|
|
* This can handle symlinks of any size. It is optimised for symlinks
|
|
* under GFS2_FAST_NAME_SIZE.
|
|
*
|
|
* Returns: 0 on success or error code
|
|
*/
|
|
|
|
static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
|
|
char array[GFS2_FAST_NAME_SIZE], *buf = array;
|
|
unsigned int len = GFS2_FAST_NAME_SIZE;
|
|
int error;
|
|
|
|
error = gfs2_readlinki(ip, &buf, &len);
|
|
if (!error) {
|
|
error = vfs_follow_link(nd, buf);
|
|
if (buf != array)
|
|
kfree(buf);
|
|
}
|
|
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/**
|
|
* gfs2_permission -
|
|
* @inode:
|
|
* @mask:
|
|
* @nd: passed from Linux VFS, ignored by us
|
|
*
|
|
* This may be called from the VFS directly, or from within GFS2 with the
|
|
* inode locked, so we look to see if the glock is already locked and only
|
|
* lock the glock if its not already been done.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_permission(struct inode *inode, int mask)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
int unlock = 0;
|
|
|
|
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
|
|
if (error)
|
|
return error;
|
|
unlock = 1;
|
|
}
|
|
|
|
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
|
|
error = -EACCES;
|
|
else
|
|
error = generic_permission(inode, mask, gfs2_check_acl);
|
|
if (unlock)
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int setattr_size(struct inode *inode, struct iattr *attr)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
int error;
|
|
|
|
if (attr->ia_size != ip->i_di.di_size) {
|
|
error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
|
|
if (error)
|
|
return error;
|
|
error = vmtruncate(inode, attr->ia_size);
|
|
gfs2_trans_end(sdp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
error = gfs2_truncatei(ip, attr->ia_size);
|
|
if (error && (inode->i_size != ip->i_di.di_size))
|
|
i_size_write(inode, ip->i_di.di_size);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int setattr_chown(struct inode *inode, struct iattr *attr)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct buffer_head *dibh;
|
|
u32 ouid, ogid, nuid, ngid;
|
|
int error;
|
|
|
|
ouid = inode->i_uid;
|
|
ogid = inode->i_gid;
|
|
nuid = attr->ia_uid;
|
|
ngid = attr->ia_gid;
|
|
|
|
if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
|
|
ouid = nuid = NO_QUOTA_CHANGE;
|
|
if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
|
|
ogid = ngid = NO_QUOTA_CHANGE;
|
|
|
|
if (!gfs2_alloc_get(ip))
|
|
return -ENOMEM;
|
|
|
|
error = gfs2_quota_lock(ip, nuid, ngid);
|
|
if (error)
|
|
goto out_alloc;
|
|
|
|
if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
|
|
error = gfs2_quota_check(ip, nuid, ngid);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
}
|
|
|
|
error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = inode_setattr(inode, attr);
|
|
gfs2_assert_warn(sdp, !error);
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(ip, dibh->b_data);
|
|
brelse(dibh);
|
|
|
|
if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
|
|
u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
|
|
gfs2_quota_change(ip, -blocks, ouid, ogid);
|
|
gfs2_quota_change(ip, blocks, nuid, ngid);
|
|
}
|
|
|
|
out_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
out_gunlock_q:
|
|
gfs2_quota_unlock(ip);
|
|
out_alloc:
|
|
gfs2_alloc_put(ip);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_setattr - Change attributes on an inode
|
|
* @dentry: The dentry which is changing
|
|
* @attr: The structure describing the change
|
|
*
|
|
* The VFS layer wants to change one or more of an inodes attributes. Write
|
|
* that change out to disk.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
|
|
if (error)
|
|
return error;
|
|
|
|
error = -EPERM;
|
|
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
|
|
goto out;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (attr->ia_valid & ATTR_SIZE)
|
|
error = setattr_size(inode, attr);
|
|
else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
|
|
error = setattr_chown(inode, attr);
|
|
else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
|
|
error = gfs2_acl_chmod(ip, attr);
|
|
else
|
|
error = gfs2_setattr_simple(ip, attr);
|
|
|
|
out:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
if (!error)
|
|
mark_inode_dirty(inode);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_getattr - Read out an inode's attributes
|
|
* @mnt: The vfsmount the inode is being accessed from
|
|
* @dentry: The dentry to stat
|
|
* @stat: The inode's stats
|
|
*
|
|
* This may be called from the VFS directly, or from within GFS2 with the
|
|
* inode locked, so we look to see if the glock is already locked and only
|
|
* lock the glock if its not already been done. Note that its the NFS
|
|
* readdirplus operation which causes this to be called (from filldir)
|
|
* with the glock already held.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
int error;
|
|
int unlock = 0;
|
|
|
|
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
|
|
if (error)
|
|
return error;
|
|
unlock = 1;
|
|
}
|
|
|
|
generic_fillattr(inode, stat);
|
|
if (unlock)
|
|
gfs2_glock_dq_uninit(&gh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gfs2_setxattr(struct dentry *dentry, const char *name,
|
|
const void *data, size_t size, int flags)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct gfs2_ea_request er;
|
|
|
|
memset(&er, 0, sizeof(struct gfs2_ea_request));
|
|
er.er_type = gfs2_ea_name2type(name, &er.er_name);
|
|
if (er.er_type == GFS2_EATYPE_UNUSED)
|
|
return -EOPNOTSUPP;
|
|
er.er_data = (char *)data;
|
|
er.er_name_len = strlen(er.er_name);
|
|
er.er_data_len = size;
|
|
er.er_flags = flags;
|
|
|
|
gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
|
|
|
|
return gfs2_ea_set(GFS2_I(inode), &er);
|
|
}
|
|
|
|
static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
|
|
void *data, size_t size)
|
|
{
|
|
struct gfs2_ea_request er;
|
|
|
|
memset(&er, 0, sizeof(struct gfs2_ea_request));
|
|
er.er_type = gfs2_ea_name2type(name, &er.er_name);
|
|
if (er.er_type == GFS2_EATYPE_UNUSED)
|
|
return -EOPNOTSUPP;
|
|
er.er_data = data;
|
|
er.er_name_len = strlen(er.er_name);
|
|
er.er_data_len = size;
|
|
|
|
return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
|
|
}
|
|
|
|
static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
|
|
{
|
|
struct gfs2_ea_request er;
|
|
|
|
memset(&er, 0, sizeof(struct gfs2_ea_request));
|
|
er.er_data = (size) ? buffer : NULL;
|
|
er.er_data_len = size;
|
|
|
|
return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
|
|
}
|
|
|
|
static int gfs2_removexattr(struct dentry *dentry, const char *name)
|
|
{
|
|
struct gfs2_ea_request er;
|
|
|
|
memset(&er, 0, sizeof(struct gfs2_ea_request));
|
|
er.er_type = gfs2_ea_name2type(name, &er.er_name);
|
|
if (er.er_type == GFS2_EATYPE_UNUSED)
|
|
return -EOPNOTSUPP;
|
|
er.er_name_len = strlen(er.er_name);
|
|
|
|
return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
|
|
}
|
|
|
|
const struct inode_operations gfs2_file_iops = {
|
|
.permission = gfs2_permission,
|
|
.setattr = gfs2_setattr,
|
|
.getattr = gfs2_getattr,
|
|
.setxattr = gfs2_setxattr,
|
|
.getxattr = gfs2_getxattr,
|
|
.listxattr = gfs2_listxattr,
|
|
.removexattr = gfs2_removexattr,
|
|
};
|
|
|
|
const struct inode_operations gfs2_dir_iops = {
|
|
.create = gfs2_create,
|
|
.lookup = gfs2_lookup,
|
|
.link = gfs2_link,
|
|
.unlink = gfs2_unlink,
|
|
.symlink = gfs2_symlink,
|
|
.mkdir = gfs2_mkdir,
|
|
.rmdir = gfs2_rmdir,
|
|
.mknod = gfs2_mknod,
|
|
.rename = gfs2_rename,
|
|
.permission = gfs2_permission,
|
|
.setattr = gfs2_setattr,
|
|
.getattr = gfs2_getattr,
|
|
.setxattr = gfs2_setxattr,
|
|
.getxattr = gfs2_getxattr,
|
|
.listxattr = gfs2_listxattr,
|
|
.removexattr = gfs2_removexattr,
|
|
};
|
|
|
|
const struct inode_operations gfs2_symlink_iops = {
|
|
.readlink = gfs2_readlink,
|
|
.follow_link = gfs2_follow_link,
|
|
.permission = gfs2_permission,
|
|
.setattr = gfs2_setattr,
|
|
.getattr = gfs2_getattr,
|
|
.setxattr = gfs2_setxattr,
|
|
.getxattr = gfs2_getxattr,
|
|
.listxattr = gfs2_listxattr,
|
|
.removexattr = gfs2_removexattr,
|
|
};
|
|
|