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linux/fs/gfs2/ops_export.c
Steven Whitehouse f42faf4fa4 [GFS2] Add gfs2_internal_read() 
Add the new external read function. Its temporarily in jdata.c
even though the protoype is in ops_file.h - this will change
shortly. The current implementation will change to a page cache
one when that happens.

In order to effect the above changes, the various internal inodes
now have Linux inodes attached to them. We keep the references to
the Linux inodes, rather than the gfs2_inodes in the super block.

In order to get everything to work correctly I've had to reorder
the init sequence on mount (which I should probably have done
earlier when .gfs2_admin was made visible).

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-30 18:34:10 +00:00

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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 v.2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "ops_export.h"
#include "rgrp.h"
static struct dentry *gfs2_decode_fh(struct super_block *sb,
__u32 *fh,
int fh_len,
int fh_type,
int (*acceptable)(void *context,
struct dentry *dentry),
void *context)
{
struct gfs2_inum this, parent;
atomic_inc(&get_v2sdp(sb)->sd_ops_export);
if (fh_type != fh_len)
return NULL;
memset(&parent, 0, sizeof(struct gfs2_inum));
switch (fh_type) {
case 8:
parent.no_formal_ino = ((uint64_t)be32_to_cpu(fh[4])) << 32;
parent.no_formal_ino |= be32_to_cpu(fh[5]);
parent.no_addr = ((uint64_t)be32_to_cpu(fh[6])) << 32;
parent.no_addr |= be32_to_cpu(fh[7]);
case 4:
this.no_formal_ino = ((uint64_t)be32_to_cpu(fh[0])) << 32;
this.no_formal_ino |= be32_to_cpu(fh[1]);
this.no_addr = ((uint64_t)be32_to_cpu(fh[2])) << 32;
this.no_addr |= be32_to_cpu(fh[3]);
break;
default:
return NULL;
}
return gfs2_export_ops.find_exported_dentry(sb, &this, &parent,
acceptable, context);
}
static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
int connectable)
{
struct inode *inode = dentry->d_inode;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_sbd *sdp = ip->i_sbd;
atomic_inc(&sdp->sd_ops_export);
if (*len < 4 || (connectable && *len < 8))
return 255;
fh[0] = ip->i_num.no_formal_ino >> 32;
fh[0] = cpu_to_be32(fh[0]);
fh[1] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
fh[1] = cpu_to_be32(fh[1]);
fh[2] = ip->i_num.no_addr >> 32;
fh[2] = cpu_to_be32(fh[2]);
fh[3] = ip->i_num.no_addr & 0xFFFFFFFF;
fh[3] = cpu_to_be32(fh[3]);
*len = 4;
if (!connectable || ip == get_v2ip(sdp->sd_root_dir))
return *len;
spin_lock(&dentry->d_lock);
inode = dentry->d_parent->d_inode;
ip = get_v2ip(inode);
gfs2_inode_hold(ip);
spin_unlock(&dentry->d_lock);
fh[4] = ip->i_num.no_formal_ino >> 32;
fh[4] = cpu_to_be32(fh[4]);
fh[5] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
fh[5] = cpu_to_be32(fh[5]);
fh[6] = ip->i_num.no_addr >> 32;
fh[6] = cpu_to_be32(fh[6]);
fh[7] = ip->i_num.no_addr & 0xFFFFFFFF;
fh[7] = cpu_to_be32(fh[7]);
*len = 8;
gfs2_inode_put(ip);
return *len;
}
struct get_name_filldir {
struct gfs2_inum inum;
char *name;
};
static int get_name_filldir(void *opaque, const char *name, unsigned int length,
uint64_t offset, struct gfs2_inum *inum,
unsigned int type)
{
struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque;
if (!gfs2_inum_equal(inum, &gnfd->inum))
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;
uint64_t offset = 0;
int error;
if (!dir)
return -EINVAL;
atomic_inc(&get_v2sdp(dir->i_sb)->sd_ops_export);
if (!S_ISDIR(dir->i_mode) || !inode)
return -EINVAL;
dip = get_v2ip(dir);
ip = get_v2ip(inode);
*name = 0;
gnfd.inum = ip->i_num;
gnfd.name = name;
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
if (error)
return error;
error = gfs2_dir_read(dip, &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 gfs2_inode *dip = get_v2ip(child->d_inode);
struct qstr dotdot = { .name = "..", .len = 2 };
struct gfs2_inode *ip;
struct inode *inode;
struct dentry *dentry;
int error;
atomic_inc(&dip->i_sbd->sd_ops_export);
error = gfs2_lookupi(dip, &dotdot, 1, &ip);
if (error)
return ERR_PTR(error);
inode = gfs2_ip2v(ip);
gfs2_inode_put(ip);
if (!inode)
return ERR_PTR(-ENOMEM);
dentry = d_alloc_anon(inode);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
return dentry;
}
static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_p)
{
struct gfs2_sbd *sdp = get_v2sdp(sb);
struct gfs2_inum *inum = (struct gfs2_inum *)inum_p;
struct gfs2_holder i_gh, ri_gh, rgd_gh;
struct gfs2_rgrpd *rgd;
struct gfs2_inode *ip;
struct inode *inode;
struct dentry *dentry;
int error;
atomic_inc(&sdp->sd_ops_export);
/* System files? */
inode = gfs2_iget(sb, inum);
if (inode) {
ip = get_v2ip(inode);
if (ip->i_num.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 | GL_LOCAL_EXCL,
&i_gh);
if (error)
return ERR_PTR(error);
error = gfs2_inode_get(i_gh.gh_gl, inum, NO_CREATE, &ip);
if (error)
goto fail;
if (ip)
goto out_ip;
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);
error = gfs2_inode_get(i_gh.gh_gl, inum, CREATE, &ip);
if (error)
goto fail;
error = gfs2_inode_refresh(ip);
if (error) {
gfs2_inode_put(ip);
goto fail;
}
atomic_inc(&sdp->sd_fh2dentry_misses);
out_ip:
error = -EIO;
if (ip->i_di.di_flags & GFS2_DIF_SYSTEM) {
gfs2_inode_put(ip);
goto fail;
}
gfs2_glock_dq_uninit(&i_gh);
inode = gfs2_ip2v(ip);
gfs2_inode_put(ip);
if (!inode)
return ERR_PTR(-ENOMEM);
out_inode:
dentry = d_alloc_anon(inode);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
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);
}
struct export_operations gfs2_export_ops = {
.decode_fh = gfs2_decode_fh,
.encode_fh = gfs2_encode_fh,
.get_name = gfs2_get_name,
.get_parent = gfs2_get_parent,
.get_dentry = gfs2_get_dentry,
};
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