1 files changed, 310 insertions, 0 deletions

diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
new file mode 100644
index 000000000000..0ae3a0af192d
--- /dev/null
+++ b/fs/gfs2/ops_export.c
@@ -0,0 +1,310 @@
+/*
+ * 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 == 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,
+};
+