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