staging: pohmelfs: remove drivers/staging/pohmelfs

New pohmelfs is coming, and it is time to remove deadly old design
https://lkml.org/lkml/2012/2/8/293Signed-off-by: NEvgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/Kconfig

@@ -60,8 +60,6 @@ source "drivers/staging/rts5139/Kconfig"
 
 source "drivers/staging/frontier/Kconfig"
 
-source "drivers/staging/pohmelfs/Kconfig"
-
 source "drivers/staging/phison/Kconfig"
 
 source "drivers/staging/line6/Kconfig"

drivers/staging/Makefile

@@ -22,7 +22,6 @@ obj-$(CONFIG_R8712U)		+= rtl8712/
 obj-$(CONFIG_RTS_PSTOR)		+= rts_pstor/
 obj-$(CONFIG_RTS5139)		+= rts5139/
 obj-$(CONFIG_TRANZPORT)		+= frontier/
-obj-$(CONFIG_POHMELFS)		+= pohmelfs/
 obj-$(CONFIG_IDE_PHISON)	+= phison/
 obj-$(CONFIG_LINE6_USB)		+= line6/
 obj-$(CONFIG_USB_SERIAL_QUATECH2)	+= serqt_usb2/

drivers/staging/pohmelfs/Kconfig

-config POHMELFS
-	tristate "POHMELFS filesystem support"
-	depends on NET
-	select CONNECTOR
-	select CRYPTO
-	select CRYPTO_BLKCIPHER
-	select CRYPTO_HMAC
-	help
-	  POHMELFS stands for Parallel Optimized Host Message Exchange Layered
-	  File System.  This is a network filesystem which supports coherent
-	  caching of data and metadata on clients.
-
-config POHMELFS_DEBUG
-	bool "POHMELFS debugging"
-	depends on POHMELFS
-	default n
-	help
-	  Turns on excessive POHMELFS debugging facilities.
-	  You usually do not want to slow things down noticeably and get really
-	  lots of kernel messages in syslog.

drivers/staging/pohmelfs/Makefile

-obj-$(CONFIG_POHMELFS)	+= pohmelfs.o
-
-pohmelfs-y := inode.o config.o dir.o net.o path_entry.o trans.o crypto.o lock.o mcache.o

drivers/staging/pohmelfs/config.c

-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program 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 program 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.
- */
-
-#include <linux/kernel.h>
-#include <linux/connector.h>
-#include <linux/crypto.h>
-#include <linux/list.h>
-#include <linux/mutex.h>
-#include <linux/string.h>
-#include <linux/in.h>
-#include <linux/slab.h>
-
-#include "netfs.h"
-
-/*
- * Global configuration list.
- * Each client can be asked to get one of them.
- *
- * Allows to provide remote server address (ipv4/v6/whatever), port
- * and so on via kernel connector.
- */
-
-static struct cb_id pohmelfs_cn_id = {.idx = POHMELFS_CN_IDX, .val = POHMELFS_CN_VAL};
-static LIST_HEAD(pohmelfs_config_list);
-static DEFINE_MUTEX(pohmelfs_config_lock);
-
-static inline int pohmelfs_config_eql(struct pohmelfs_ctl *sc, struct pohmelfs_ctl *ctl)
-{
-	if (sc->idx == ctl->idx && sc->type == ctl->type &&
-			sc->proto == ctl->proto &&
-			sc->addrlen == ctl->addrlen &&
-			!memcmp(&sc->addr, &ctl->addr, ctl->addrlen))
-		return 1;
-
-	return 0;
-}
-
-static struct pohmelfs_config_group *pohmelfs_find_config_group(unsigned int idx)
-{
-	struct pohmelfs_config_group *g, *group = NULL;
-
-	list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-		if (g->idx == idx) {
-			group = g;
-			break;
-		}
-	}
-
-	return group;
-}
-
-static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned int idx)
-{
-	struct pohmelfs_config_group *g;
-
-	g = pohmelfs_find_config_group(idx);
-	if (g)
-		return g;
-
-	g = kzalloc(sizeof(struct pohmelfs_config_group), GFP_KERNEL);
-	if (!g)
-		return NULL;
-
-	INIT_LIST_HEAD(&g->config_list);
-	g->idx = idx;
-	g->num_entry = 0;
-
-	list_add_tail(&g->group_entry, &pohmelfs_config_list);
-
-	return g;
-}
-
-static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst)
-{
-	struct pohmelfs_config *tmp;
-
-	INIT_LIST_HEAD(&dst->config_entry);
-
-	list_for_each_entry(tmp, &psb->state_list, config_entry) {
-		if (dst->state.ctl.prio > tmp->state.ctl.prio)
-			list_add_tail(&dst->config_entry, &tmp->config_entry);
-	}
-	if (list_empty(&dst->config_entry))
-		list_add_tail(&dst->config_entry, &psb->state_list);
-}
-
-static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb,
-		struct pohmelfs_config *dst, struct pohmelfs_config *new)
-{
-	if ((dst->state.ctl.prio == new->state.ctl.prio) &&
-		(dst->state.ctl.perm == new->state.ctl.perm))
-		return 0;
-
-	dprintk("%s: dst: prio: %d, perm: %x, new: prio: %d, perm: %d.\n",
-			__func__, dst->state.ctl.prio, dst->state.ctl.perm,
-			new->state.ctl.prio, new->state.ctl.perm);
-	dst->state.ctl.prio = new->state.ctl.prio;
-	dst->state.ctl.perm = new->state.ctl.perm;
-
-	list_del_init(&dst->config_entry);
-	pohmelfs_insert_config_entry(psb, dst);
-	return 0;
-}
-
-/*
- * pohmelfs_copy_config() is used to copy new state configs from the
- * config group (controlled by the netlink messages) into the superblock.
- * This happens either at startup time where no transactions can access
- * the list of the configs (and thus list of the network states), or at
- * run-time, where it is protected by the psb->state_lock.
- */
-int pohmelfs_copy_config(struct pohmelfs_sb *psb)
-{
-	struct pohmelfs_config_group *g;
-	struct pohmelfs_config *c, *dst;
-	int err = -ENODEV;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	g = pohmelfs_find_config_group(psb->idx);
-	if (!g)
-		goto out_unlock;
-
-	/*
-	 * Run over all entries in given config group and try to create and
-	 * initialize those, which do not exist in superblock list.
-	 * Skip all existing entries.
-	 */
-
-	list_for_each_entry(c, &g->config_list, config_entry) {
-		err = 0;
-		list_for_each_entry(dst, &psb->state_list, config_entry) {
-			if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) {
-				err = pohmelfs_move_config_entry(psb, dst, c);
-				if (!err)
-					err = -EEXIST;
-				break;
-			}
-		}
-
-		if (err)
-			continue;
-
-		dst = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL);
-		if (!dst) {
-			err = -ENOMEM;
-			break;
-		}
-
-		memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl));
-
-		pohmelfs_insert_config_entry(psb, dst);
-
-		err = pohmelfs_state_init_one(psb, dst);
-		if (err) {
-			list_del(&dst->config_entry);
-			kfree(dst);
-		}
-
-		err = 0;
-	}
-
-out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-
-	return err;
-}
-
-int pohmelfs_copy_crypto(struct pohmelfs_sb *psb)
-{
-	struct pohmelfs_config_group *g;
-	int err = -ENOENT;
-
-	mutex_lock(&pohmelfs_config_lock);
-	g = pohmelfs_find_config_group(psb->idx);
-	if (!g)
-		goto err_out_exit;
-
-	if (g->hash_string) {
-		err = -ENOMEM;
-		psb->hash_string = kstrdup(g->hash_string, GFP_KERNEL);
-		if (!psb->hash_string)
-			goto err_out_exit;
-		psb->hash_strlen = g->hash_strlen;
-	}
-
-	if (g->cipher_string) {
-		psb->cipher_string = kstrdup(g->cipher_string, GFP_KERNEL);
-		if (!psb->cipher_string)
-			goto err_out_free_hash_string;
-		psb->cipher_strlen = g->cipher_strlen;
-	}
-
-	if (g->hash_keysize) {
-		psb->hash_key = kmemdup(g->hash_key, g->hash_keysize,
-					GFP_KERNEL);
-		if (!psb->hash_key)
-			goto err_out_free_cipher_string;
-		psb->hash_keysize = g->hash_keysize;
-	}
-
-	if (g->cipher_keysize) {
-		psb->cipher_key = kmemdup(g->cipher_key, g->cipher_keysize,
-					  GFP_KERNEL);
-		if (!psb->cipher_key)
-			goto err_out_free_hash;
-		psb->cipher_keysize = g->cipher_keysize;
-	}
-
-	mutex_unlock(&pohmelfs_config_lock);
-
-	return 0;
-
-err_out_free_hash:
-	kfree(psb->hash_key);
-err_out_free_cipher_string:
-	kfree(psb->cipher_string);
-err_out_free_hash_string:
-	kfree(psb->hash_string);
-err_out_exit:
-	mutex_unlock(&pohmelfs_config_lock);
-	return err;
-}
-
-static int pohmelfs_send_reply(int err, int msg_num, int action, struct cn_msg *msg, struct pohmelfs_ctl *ctl)
-{
-	struct pohmelfs_cn_ack *ack;
-
-	ack = kzalloc(sizeof(struct pohmelfs_cn_ack), GFP_KERNEL);
-	if (!ack)
-		return -ENOMEM;
-
-	memcpy(&ack->msg, msg, sizeof(struct cn_msg));
-
-	if (action == POHMELFS_CTLINFO_ACK)
-		memcpy(&ack->ctl, ctl, sizeof(struct pohmelfs_ctl));
-
-	ack->msg.len = sizeof(struct pohmelfs_cn_ack) - sizeof(struct cn_msg);
-	ack->msg.ack = msg->ack + 1;
-	ack->error = err;
-	ack->msg_num = msg_num;
-
-	cn_netlink_send(&ack->msg, 0, GFP_KERNEL);
-	kfree(ack);
-	return 0;
-}
-
-static int pohmelfs_cn_disp(struct cn_msg *msg)
-{
-	struct pohmelfs_config_group *g;
-	struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
-	struct pohmelfs_config *c, *tmp;
-	int err = 0, i = 1;
-
-	if (msg->len != sizeof(struct pohmelfs_ctl))
-		return -EBADMSG;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	g = pohmelfs_find_config_group(ctl->idx);
-	if (!g) {
-		pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL);
-		goto out_unlock;
-	}
-
-	list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
-		struct pohmelfs_ctl *sc = &c->state.ctl;
-		if (pohmelfs_send_reply(err, g->num_entry - i, POHMELFS_CTLINFO_ACK, msg, sc)) {
-			err = -ENOMEM;
-			goto out_unlock;
-		}
-		i += 1;
-	}
-
- out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-	return err;
-}
-
-static int pohmelfs_cn_dump(struct cn_msg *msg)
-{
-	struct pohmelfs_config_group *g;
-	struct pohmelfs_config *c, *tmp;
-	int err = 0, i = 1;
-	int total_msg = 0;
-
-	if (msg->len != sizeof(struct pohmelfs_ctl))
-		return -EBADMSG;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	list_for_each_entry(g, &pohmelfs_config_list, group_entry)
-		total_msg += g->num_entry;
-	if (total_msg == 0) {
-		if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
-			err = -ENOMEM;
-		goto out_unlock;
-	}
-
-	list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-		list_for_each_entry_safe(c, tmp, &g->config_list,
-					 config_entry) {
-			struct pohmelfs_ctl *sc = &c->state.ctl;
-			if (pohmelfs_send_reply(err, total_msg - i,
-						POHMELFS_CTLINFO_ACK, msg,
-						sc)) {
-				err = -ENOMEM;
-				goto out_unlock;
-			}
-			i += 1;
-		}
-	}
-
-out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-	return err;
-}
-
-static int pohmelfs_cn_flush(struct cn_msg *msg)
-{
-	struct pohmelfs_config_group *g;
-	struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
-	struct pohmelfs_config *c, *tmp;
-	int err = 0;
-
-	if (msg->len != sizeof(struct pohmelfs_ctl))
-		return -EBADMSG;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	if (ctl->idx != POHMELFS_NULL_IDX) {
-		g = pohmelfs_find_config_group(ctl->idx);
-
-		if (!g)
-			goto out_unlock;
-
-		list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
-			list_del(&c->config_entry);
-			g->num_entry--;
-			kfree(c);
-		}
-	} else {
-		list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-			list_for_each_entry_safe(c, tmp, &g->config_list,
-						 config_entry) {
-				list_del(&c->config_entry);
-				g->num_entry--;
-				kfree(c);
-			}
-		}
-	}
-
-out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-	pohmelfs_cn_dump(msg);
-
-	return err;
-}
-
-static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new)
-{
-	old->perm = new->perm;
-	old->prio = new->prio;
-	return 0;
-}
-
-static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
-{
-	struct pohmelfs_config_group *g;
-	struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
-	struct pohmelfs_config *c, *tmp;
-	int err = 0;
-
-	if (msg->len != sizeof(struct pohmelfs_ctl))
-		return -EBADMSG;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	g = pohmelfs_find_create_config_group(ctl->idx);
-	if (!g) {
-		err = -ENOMEM;
-		goto out_unlock;
-	}
-
-	list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
-		struct pohmelfs_ctl *sc = &c->state.ctl;
-
-		if (pohmelfs_config_eql(sc, ctl)) {
-			if (action == POHMELFS_FLAGS_ADD) {
-				err = -EEXIST;
-				goto out_unlock;
-			} else if (action == POHMELFS_FLAGS_DEL) {
-				list_del(&c->config_entry);
-				g->num_entry--;
-				kfree(c);
-				goto out_unlock;
-			} else if (action == POHMELFS_FLAGS_MODIFY) {
-				err = pohmelfs_modify_config(sc, ctl);
-				goto out_unlock;
-			} else {
-				err = -EEXIST;
-				goto out_unlock;
-			}
-		}
-	}
-	if (action == POHMELFS_FLAGS_DEL) {
-		err = -EBADMSG;
-		goto out_unlock;
-	}
-
-	c = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL);
-	if (!c) {
-		err = -ENOMEM;
-		goto out_unlock;
-	}
-	memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl));
-	g->num_entry++;
-
-	list_add_tail(&c->config_entry, &g->config_list);
-
- out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-	if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
-		err = -ENOMEM;
-
-	return err;
-}
-
-static int pohmelfs_crypto_hash_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
-{
-	char *algo = (char *)c->data;
-	u8 *key = (u8 *)(algo + c->strlen);
-
-	if (g->hash_string)
-		return -EEXIST;
-
-	g->hash_string = kstrdup(algo, GFP_KERNEL);
-	if (!g->hash_string)
-		return -ENOMEM;
-	g->hash_strlen = c->strlen;
-	g->hash_keysize = c->keysize;
-
-	g->hash_key = kmemdup(key, c->keysize, GFP_KERNEL);
-	if (!g->hash_key) {
-		kfree(g->hash_string);
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int pohmelfs_crypto_cipher_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
-{
-	char *algo = (char *)c->data;
-	u8 *key = (u8 *)(algo + c->strlen);
-
-	if (g->cipher_string)
-		return -EEXIST;
-
-	g->cipher_string = kstrdup(algo, GFP_KERNEL);
-	if (!g->cipher_string)
-		return -ENOMEM;
-	g->cipher_strlen = c->strlen;
-	g->cipher_keysize = c->keysize;
-
-	g->cipher_key = kmemdup(key, c->keysize, GFP_KERNEL);
-	if (!g->cipher_key) {
-		kfree(g->cipher_string);
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int pohmelfs_cn_crypto(struct cn_msg *msg)
-{
-	struct pohmelfs_crypto *crypto = (struct pohmelfs_crypto *)msg->data;
-	struct pohmelfs_config_group *g;
-	int err = 0;
-
-	dprintk("%s: idx: %u, strlen: %u, type: %u, keysize: %u, algo: %s.\n",
-			__func__, crypto->idx, crypto->strlen, crypto->type,
-			crypto->keysize, (char *)crypto->data);
-
-	mutex_lock(&pohmelfs_config_lock);
-	g = pohmelfs_find_create_config_group(crypto->idx);
-	if (!g) {
-		err = -ENOMEM;
-		goto out_unlock;
-	}
-
-	switch (crypto->type) {
-	case POHMELFS_CRYPTO_HASH:
-			err = pohmelfs_crypto_hash_init(g, crypto);
-			break;
-	case POHMELFS_CRYPTO_CIPHER:
-			err = pohmelfs_crypto_cipher_init(g, crypto);
-			break;
-	default:
-			err = -ENOTSUPP;
-			break;
-	}
-
-out_unlock:
-	mutex_unlock(&pohmelfs_config_lock);
-	if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
-		err = -ENOMEM;
-
-	return err;
-}
-
-static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
-{
-	int err;
-
-	if (!cap_raised(current_cap(), CAP_SYS_ADMIN))
-		return;
-
-	switch (msg->flags) {
-	case POHMELFS_FLAGS_ADD:
-	case POHMELFS_FLAGS_DEL:
-	case POHMELFS_FLAGS_MODIFY:
-			err = pohmelfs_cn_ctl(msg, msg->flags);
-			break;
-	case POHMELFS_FLAGS_FLUSH:
-			err = pohmelfs_cn_flush(msg);
-			break;
-	case POHMELFS_FLAGS_SHOW:
-			err = pohmelfs_cn_disp(msg);
-			break;
-	case POHMELFS_FLAGS_DUMP:
-			err = pohmelfs_cn_dump(msg);
-			break;
-	case POHMELFS_FLAGS_CRYPTO:
-			err = pohmelfs_cn_crypto(msg);
-			break;
-	default:
-			err = -ENOSYS;
-			break;
-	}
-}
-
-int pohmelfs_config_check(struct pohmelfs_config *config, int idx)
-{
-	struct pohmelfs_ctl *ctl = &config->state.ctl;
-	struct pohmelfs_config *tmp;
-	int err = -ENOENT;
-	struct pohmelfs_ctl *sc;
-	struct pohmelfs_config_group *g;
-
-	mutex_lock(&pohmelfs_config_lock);
-
-	g = pohmelfs_find_config_group(ctl->idx);
-	if (g) {
-		list_for_each_entry(tmp, &g->config_list, config_entry) {
-			sc = &tmp->state.ctl;
-
-			if (pohmelfs_config_eql(sc, ctl)) {
-				err = 0;
-				break;
-			}
-		}
-	}
-
-	mutex_unlock(&pohmelfs_config_lock);
-
-	return err;
-}
-
-int __init pohmelfs_config_init(void)
-{
-	/* XXX remove (void *) cast when vanilla connector got synced */
-	return cn_add_callback(&pohmelfs_cn_id, "pohmelfs", (void *)pohmelfs_cn_callback);
-}
-
-void pohmelfs_config_exit(void)
-{
-	struct pohmelfs_config *c, *tmp;
-	struct pohmelfs_config_group *g, *gtmp;
-
-	cn_del_callback(&pohmelfs_cn_id);
-
-	mutex_lock(&pohmelfs_config_lock);
-	list_for_each_entry_safe(g, gtmp, &pohmelfs_config_list, group_entry) {
-		list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
-			list_del(&c->config_entry);
-			kfree(c);
-		}
-
-		list_del(&g->group_entry);
-
-		kfree(g->hash_string);
-
-		kfree(g->cipher_string);
-
-		kfree(g);
-	}
-	mutex_unlock(&pohmelfs_config_lock);
-}

drivers/staging/pohmelfs/lock.c

-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program 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 program 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.
- */
-
-#include <linux/module.h>
-#include <linux/backing-dev.h>
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/mempool.h>
-
-#include "netfs.h"
-
-static int pohmelfs_send_lock_trans(struct pohmelfs_inode *pi,
-		u64 id, u64 start, u32 size, int type)
-{
-	struct inode *inode = &pi->vfs_inode;
-	struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
-	struct netfs_trans *t;
-	struct netfs_cmd *cmd;
-	int path_len, err;
-	void *data;
-	struct netfs_lock *l;
-	int isize = (type & POHMELFS_LOCK_GRAB) ? 0 : sizeof(struct netfs_inode_info);
-
-	err = pohmelfs_path_length(pi);
-	if (err < 0)
-		goto err_out_exit;
-
-	path_len = err;
-
-	err = -ENOMEM;
-	t = netfs_trans_alloc(psb, path_len + sizeof(struct netfs_lock) + isize,
-			NETFS_TRANS_SINGLE_DST, 0);
-	if (!t)
-		goto err_out_exit;
-
-	cmd = netfs_trans_current(t);
-	data = cmd + 1;
-
-	err = pohmelfs_construct_path_string(pi, data, path_len);
-	if (err < 0)
-		goto err_out_free;
-	path_len = err;
-
-	l = data + path_len;
-
-	l->start = start;
-	l->size = size;
-	l->type = type;
-	l->ino = pi->ino;
-
-	cmd->cmd = NETFS_LOCK;
-	cmd->start = 0;
-	cmd->id = id;
-	cmd->size = sizeof(struct netfs_lock) + path_len + isize;
-	cmd->ext = path_len;
-	cmd->csize = 0;
-
-	netfs_convert_cmd(cmd);
-	netfs_convert_lock(l);
-
-	if (isize) {
-		struct netfs_inode_info *info = (struct netfs_inode_info *)(l + 1);
-
-		info->mode = inode->i_mode;
-		info->nlink = inode->i_nlink;
-		info->uid = inode->i_uid;
-		info->gid = inode->i_gid;
-		info->blocks = inode->i_blocks;
-		info->rdev = inode->i_rdev;
-		info->size = inode->i_size;
-		info->version = inode->i_version;
-
-		netfs_convert_inode_info(info);
-	}
-
-	netfs_trans_update(cmd, t, path_len + sizeof(struct netfs_lock) + isize);
-
-	return netfs_trans_finish(t, psb);
-
-err_out_free:
-	netfs_trans_free(t);
-err_out_exit:
-	printk("%s: err: %d.\n", __func__, err);
-	return err;
-}
-
-int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type)
-{
-	struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
-	struct pohmelfs_mcache *m;
-	int err = -ENOMEM;
-	struct iattr iattr;
-	struct inode *inode = &pi->vfs_inode;
-
-	dprintk("%s: %p: ino: %llu, start: %llu, size: %u, "
-			"type: %d, locked as: %d, owned: %d.\n",
-			__func__, &pi->vfs_inode, pi->ino,
-			start, size, type, pi->lock_type,
-			!!test_bit(NETFS_INODE_OWNED, &pi->state));
-
-	if (!pohmelfs_need_lock(pi, type))
-		return 0;
-
-	m = pohmelfs_mcache_alloc(psb, start, size, NULL);
-	if (IS_ERR(m))
-		return PTR_ERR(m);
-
-	err = pohmelfs_send_lock_trans(pi, m->gen, start, size,
-			type | POHMELFS_LOCK_GRAB);
-	if (err)
-		goto err_out_put;
-
-	err = wait_for_completion_timeout(&m->complete, psb->mcache_timeout);
-	if (err)
-		err = m->err;
-	else
-		err = -ETIMEDOUT;
-
-	if (err) {
-		printk("%s: %p: ino: %llu, mgen: %llu, start: %llu, size: %u, err: %d.\n",
-			__func__, &pi->vfs_inode, pi->ino, m->gen, start, size, err);
-	}
-
-	if (err && (err != -ENOENT))
-		goto err_out_put;
-
-	if (!err) {
-		netfs_convert_inode_info(&m->info);
-
-		iattr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_SIZE | ATTR_ATIME;
-		iattr.ia_mode = m->info.mode;
-		iattr.ia_uid = m->info.uid;
-		iattr.ia_gid = m->info.gid;
-		iattr.ia_size = m->info.size;
-		iattr.ia_atime = CURRENT_TIME;
-
-		dprintk("%s: %p: ino: %llu, mgen: %llu, start: %llu, isize: %llu -> %llu.\n",
-			__func__, &pi->vfs_inode, pi->ino, m->gen, start, inode->i_size, m->info.size);
-
-		err = pohmelfs_setattr_raw(inode, &iattr);
-		if (!err) {
-			struct dentry *dentry = d_find_alias(inode);
-			if (dentry) {
-				fsnotify_change(dentry, iattr.ia_valid);
-				dput(dentry);
-			}
-		}
-	}
-
-	pi->lock_type = type;
-	set_bit(NETFS_INODE_OWNED, &pi->state);
-
-	pohmelfs_mcache_put(psb, m);
-
-	return 0;
-
-err_out_put:
-	pohmelfs_mcache_put(psb, m);
-	return err;
-}
-
-int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type)
-{
-	dprintk("%s: %p: ino: %llu, start: %llu, size: %u, type: %d.\n",
-			__func__, &pi->vfs_inode, pi->ino, start, size, type);
-	pi->lock_type = 0;
-	clear_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state);
-	clear_bit(NETFS_INODE_OWNED, &pi->state);
-	return pohmelfs_send_lock_trans(pi, pi->ino, start, size, type);
-}

drivers/staging/pohmelfs/path_entry.c

-/*
- * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
- * All rights reserved.
- *
- * This program 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 program 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.
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/ktime.h>
-#include <linux/fs_struct.h>
-#include <linux/pagemap.h>
-#include <linux/writeback.h>
-#include <linux/mount.h>
-#include <linux/mm.h>
-
-#include "netfs.h"
-
-#define UNHASHED_OBSCURE_STRING_SIZE		sizeof(" (deleted)")
-
-/*
- * Create path from root for given inode.
- * Path is formed as set of stuctures, containing name of the object
- * and its inode data (mode, permissions and so on).
- */
-int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len)
-{
-	struct path path;
-	struct dentry *d;
-	char *ptr;
-	int err = 0, strlen, reduce = 0;
-
-	d = d_find_alias(&pi->vfs_inode);
-	if (!d) {
-		printk("%s: no alias, list_empty: %d.\n", __func__, list_empty(&pi->vfs_inode.i_dentry));
-		return -ENOENT;
-	}
-
-	spin_lock(&current->fs->lock);
-	path.mnt = mntget(current->fs->root.mnt);
-	spin_unlock(&current->fs->lock);
-
-	path.dentry = d;
-
-	if (!IS_ROOT(d) && d_unhashed(d))
-		reduce = 1;
-
-	ptr = d_path(&path, data, len);
-	if (IS_ERR(ptr)) {
-		err = PTR_ERR(ptr);
-		goto out;
-	}
-
-	if (reduce && len >= UNHASHED_OBSCURE_STRING_SIZE) {
-		char *end = data + len - UNHASHED_OBSCURE_STRING_SIZE;
-		*end = '\0';
-	}
-
-	strlen = len - (ptr - (char *)data);
-	memmove(data, ptr, strlen);
-	ptr = data;
-
-	err = strlen;
-
-	dprintk("%s: dname: '%s', len: %u, maxlen: %u, name: '%s', strlen: %d.\n",
-			__func__, d->d_name.name, d->d_name.len, len, ptr, strlen);
-
-out:
-	dput(d);
-	mntput(path.mnt);
-
-	return err;
-}
-
-int pohmelfs_path_length(struct pohmelfs_inode *pi)
-{
-	struct dentry *d, *root, *first;
-	int len;
-	unsigned seq;
-
-	first = d_find_alias(&pi->vfs_inode);
-	if (!first) {
-		dprintk("%s: ino: %llu, mode: %o.\n", __func__, pi->ino, pi->vfs_inode.i_mode);
-		return -ENOENT;
-	}
-
-	spin_lock(&current->fs->lock);
-	root = dget(current->fs->root.dentry);
-	spin_unlock(&current->fs->lock);
-
-rename_retry:
-	len = 1; /* Root slash */
-	d = first;
-	seq = read_seqbegin(&rename_lock);
-	rcu_read_lock();
-
-	if (!IS_ROOT(d) && d_unhashed(d))
-		len += UNHASHED_OBSCURE_STRING_SIZE; /* Obscure " (deleted)" string */
-
-	while (d && d != root && !IS_ROOT(d)) {
-		len += d->d_name.len + 1; /* Plus slash */
-		d = d->d_parent;
-	}
-	rcu_read_unlock();
-	if (read_seqretry(&rename_lock, seq))
-		goto rename_retry;
-
-	dput(root);
-	dput(first);
-
-	return len + 1; /* Including zero-byte */
-}