286 lines
6.3 KiB
C
286 lines
6.3 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/exportfs.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
#include <linux/crc32.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "dir.h"
|
|
#include "glock.h"
|
|
#include "glops.h"
|
|
#include "inode.h"
|
|
#include "super.h"
|
|
#include "rgrp.h"
|
|
#include "util.h"
|
|
|
|
#define GFS2_SMALL_FH_SIZE 4
|
|
#define GFS2_LARGE_FH_SIZE 8
|
|
#define GFS2_OLD_FH_SIZE 10
|
|
|
|
static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
|
|
int connectable)
|
|
{
|
|
__be32 *fh = (__force __be32 *)p;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
|
|
if (*len < GFS2_SMALL_FH_SIZE ||
|
|
(connectable && *len < GFS2_LARGE_FH_SIZE))
|
|
return 255;
|
|
|
|
fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
|
|
fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
|
|
fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
|
|
fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
|
|
*len = GFS2_SMALL_FH_SIZE;
|
|
|
|
if (!connectable || inode == sb->s_root->d_inode)
|
|
return *len;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
inode = dentry->d_parent->d_inode;
|
|
ip = GFS2_I(inode);
|
|
igrab(inode);
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
|
|
fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
|
|
fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
|
|
fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
|
|
*len = GFS2_LARGE_FH_SIZE;
|
|
|
|
iput(inode);
|
|
|
|
return *len;
|
|
}
|
|
|
|
struct get_name_filldir {
|
|
struct gfs2_inum_host inum;
|
|
char *name;
|
|
};
|
|
|
|
static int get_name_filldir(void *opaque, const char *name, int length,
|
|
loff_t offset, u64 inum, unsigned int type)
|
|
{
|
|
struct get_name_filldir *gnfd = opaque;
|
|
|
|
if (inum != gnfd->inum.no_addr)
|
|
return 0;
|
|
|
|
memcpy(gnfd->name, name, length);
|
|
gnfd->name[length] = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int gfs2_get_name(struct dentry *parent, char *name,
|
|
struct dentry *child)
|
|
{
|
|
struct inode *dir = parent->d_inode;
|
|
struct inode *inode = child->d_inode;
|
|
struct gfs2_inode *dip, *ip;
|
|
struct get_name_filldir gnfd;
|
|
struct gfs2_holder gh;
|
|
u64 offset = 0;
|
|
int error;
|
|
|
|
if (!dir)
|
|
return -EINVAL;
|
|
|
|
if (!S_ISDIR(dir->i_mode) || !inode)
|
|
return -EINVAL;
|
|
|
|
dip = GFS2_I(dir);
|
|
ip = GFS2_I(inode);
|
|
|
|
*name = 0;
|
|
gnfd.inum.no_addr = ip->i_no_addr;
|
|
gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
|
|
gnfd.name = name;
|
|
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
|
|
if (error)
|
|
return error;
|
|
|
|
error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
|
|
|
|
gfs2_glock_dq_uninit(&gh);
|
|
|
|
if (!error && !*name)
|
|
error = -ENOENT;
|
|
|
|
return error;
|
|
}
|
|
|
|
static struct dentry *gfs2_get_parent(struct dentry *child)
|
|
{
|
|
struct qstr dotdot;
|
|
struct dentry *dentry;
|
|
|
|
/*
|
|
* XXX(hch): it would be a good idea to keep this around as a
|
|
* static variable.
|
|
*/
|
|
gfs2_str2qstr(&dotdot, "..");
|
|
|
|
dentry = d_obtain_alias(gfs2_lookupi(child->d_inode, &dotdot, 1));
|
|
if (!IS_ERR(dentry))
|
|
dentry->d_op = &gfs2_dops;
|
|
return dentry;
|
|
}
|
|
|
|
static struct dentry *gfs2_get_dentry(struct super_block *sb,
|
|
struct gfs2_inum_host *inum)
|
|
{
|
|
struct gfs2_sbd *sdp = sb->s_fs_info;
|
|
struct gfs2_holder i_gh, ri_gh, rgd_gh;
|
|
struct gfs2_rgrpd *rgd;
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
int error;
|
|
|
|
/* System files? */
|
|
|
|
inode = gfs2_ilookup(sb, inum->no_addr);
|
|
if (inode) {
|
|
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
goto out_inode;
|
|
}
|
|
|
|
error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
|
|
LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
error = gfs2_rindex_hold(sdp, &ri_gh);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = -EINVAL;
|
|
rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
|
|
if (!rgd)
|
|
goto fail_rindex;
|
|
|
|
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
|
|
if (error)
|
|
goto fail_rindex;
|
|
|
|
error = -ESTALE;
|
|
if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
|
|
goto fail_rgd;
|
|
|
|
gfs2_glock_dq_uninit(&rgd_gh);
|
|
gfs2_glock_dq_uninit(&ri_gh);
|
|
|
|
inode = gfs2_inode_lookup(sb, DT_UNKNOWN,
|
|
inum->no_addr,
|
|
0, 0);
|
|
if (IS_ERR(inode)) {
|
|
error = PTR_ERR(inode);
|
|
goto fail;
|
|
}
|
|
|
|
error = gfs2_inode_refresh(GFS2_I(inode));
|
|
if (error) {
|
|
iput(inode);
|
|
goto fail;
|
|
}
|
|
|
|
/* Pick up the works we bypass in gfs2_inode_lookup */
|
|
if (inode->i_state & I_NEW)
|
|
gfs2_set_iop(inode);
|
|
|
|
if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
|
|
iput(inode);
|
|
goto fail;
|
|
}
|
|
|
|
error = -EIO;
|
|
if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) {
|
|
iput(inode);
|
|
goto fail;
|
|
}
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
out_inode:
|
|
dentry = d_obtain_alias(inode);
|
|
if (!IS_ERR(dentry))
|
|
dentry->d_op = &gfs2_dops;
|
|
return dentry;
|
|
|
|
fail_rgd:
|
|
gfs2_glock_dq_uninit(&rgd_gh);
|
|
|
|
fail_rindex:
|
|
gfs2_glock_dq_uninit(&ri_gh);
|
|
|
|
fail:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
struct gfs2_inum_host this;
|
|
__be32 *fh = (__force __be32 *)fid->raw;
|
|
|
|
switch (fh_type) {
|
|
case GFS2_SMALL_FH_SIZE:
|
|
case GFS2_LARGE_FH_SIZE:
|
|
case GFS2_OLD_FH_SIZE:
|
|
this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
|
|
this.no_formal_ino |= be32_to_cpu(fh[1]);
|
|
this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
|
|
this.no_addr |= be32_to_cpu(fh[3]);
|
|
return gfs2_get_dentry(sb, &this);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
struct gfs2_inum_host parent;
|
|
__be32 *fh = (__force __be32 *)fid->raw;
|
|
|
|
switch (fh_type) {
|
|
case GFS2_LARGE_FH_SIZE:
|
|
case GFS2_OLD_FH_SIZE:
|
|
parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
|
|
parent.no_formal_ino |= be32_to_cpu(fh[5]);
|
|
parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
|
|
parent.no_addr |= be32_to_cpu(fh[7]);
|
|
return gfs2_get_dentry(sb, &parent);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
const struct export_operations gfs2_export_ops = {
|
|
.encode_fh = gfs2_encode_fh,
|
|
.fh_to_dentry = gfs2_fh_to_dentry,
|
|
.fh_to_parent = gfs2_fh_to_parent,
|
|
.get_name = gfs2_get_name,
|
|
.get_parent = gfs2_get_parent,
|
|
};
|
|
|