Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

164 lines (142 sloc) 4.261 kb
/*
* This file is part of the LZPL: Linux ZFS Posix Layer
*
* Copyright (c) 2010 Knowledge Quest Infotech Pvt. Ltd.
* Produced at Knowledge Quest Infotech Pvt. Ltd.
* Written by: Knowledge Quest Infotech Pvt. Ltd.
* zfs@kqinfotech.com
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/fs.h>
#include <sys/vfs.h>
#include <lzfs_exportfs.h>
#include <sys/tsd_wrapper.h>
#include <sys/vnode.h>
#include <spl-debug.h>
#ifdef SS_DEBUG_SUBSYS
#undef SS_DEBUG_SUBSYS
#endif
/*
* Log LZFS debug messages as the spl SS_USER2 subsystem.
*/
#define SS_DEBUG_SUBSYS SS_USER2
extern int zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct);
extern int zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp);
extern int zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
int *direntflags, pathname_t *realpnp);
static int lzfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, int connectable)
{
lzfs_fid_t *lzfid = (lzfs_fid_t *)fh;
struct inode *inode = dentry->d_inode;
int lfid_type = LZFS_FILEID_INO64_GEN;
vnode_t *vp;
int error = 0;
SENTRY;
lzfid->fid_len = *max_len;
if (!(S_ISDIR(inode->i_mode) || !connectable)) {
spin_lock(&dentry->d_lock);
inode = dentry->d_parent->d_inode;
spin_unlock(&dentry->d_lock);
lfid_type = LZFS_FILEID_INO64_GEN_PARENT;
}
/* If inode number is -1 then we looking into .zfs(ZFS control
* directory). Traversing .zfs from the NFS is not supported yet.
*/
if (inode->i_ino == -1) {
return 255;
}
vp = LZFS_ITOV(inode);
error = zfs_fid( vp, lzfid, 0);
tsd_exit();
SEXIT;
if (error) {
printk(KERN_WARNING "Unable to get file handle \n");
return 255;
}
*max_len = lzfid->fid_len;
return lfid_type;
}
struct dentry * lzfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
lzfs_fid_t *lzfid = (lzfs_fid_t *)fid;
vfs_t *vfsp = sb->s_fs_info;
vnode_t *vp;
int error = 0;
struct dentry *dentry = NULL;
SENTRY;
if (fh_len < 2) {
return NULL;
}
switch (fh_type) {
case LZFS_FILEID_INO64_GEN :
case LZFS_FILEID_INO64_GEN_PARENT :
error = zfs_vget( vfsp, &vp, lzfid);
break;
}
tsd_exit();
SEXIT;
if (error) {
printk(KERN_WARNING "Unable to get vnode \n");
return NULL;
}
if (LZFS_VTOI(vp)) {
#ifdef HAVE_D_ALLOC_ANON /* for kernel version < 2.6.28 */
dentry = d_alloc_anon(LZFS_VTOI(vp));
#else
dentry = d_obtain_alias(LZFS_VTOI(vp));
#endif
}
return dentry;
}
struct dentry *lzfs_get_parent(struct dentry *child)
{
vnode_t *vcp = LZFS_ITOV(child->d_inode);
vnode_t *vp;
int error = 0;
struct dentry *dentry = NULL;
const cred_t *cred = get_current_cred();
SENTRY;
error = zfs_lookup(vcp, "..", &vp, NULL, 0 , NULL,
(cred_t *) cred, NULL, NULL, NULL);
(void)put_cred(cred);
tsd_exit();
SEXIT;
if (error) {
if (error == ENOENT) {
printk(KERN_WARNING "Try to get new dentry \n");
return d_splice_alias(NULL, dentry);
} else {
printk(KERN_WARNING "Unable to get dentry \n");
return ERR_PTR(-error);
}
}
if (LZFS_VTOI(vp)) {
#ifdef HAVE_D_ALLOC_ANON /* for kernel version < 2.6.28 */
dentry = d_alloc_anon(LZFS_VTOI(vp));
#else
dentry = d_obtain_alias(LZFS_VTOI(vp));
#endif
}
return dentry;
}
const struct export_operations zfs_export_ops = {
.encode_fh = lzfs_encode_fh,
.fh_to_dentry = lzfs_fh_to_dentry,
.fh_to_parent = lzfs_fh_to_dentry,
.get_parent = lzfs_get_parent,
};
Jump to Line
Something went wrong with that request. Please try again.