- 根目录:
- drivers
- staging
- pohmelfs
- dir.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/fs.h>
#include <linux/jhash.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include "netfs.h"
static int pohmelfs_cmp_hash(struct pohmelfs_name *n, u32 hash)
{
if (n->hash > hash)
return -1;
if (n->hash < hash)
return 1;
return 0;
}
static struct pohmelfs_name *pohmelfs_search_hash_unprecise(struct pohmelfs_inode *pi, u32 hash)
{
struct rb_node *n = pi->hash_root.rb_node;
struct pohmelfs_name *tmp = NULL;
int cmp;
while (n) {
tmp = rb_entry(n, struct pohmelfs_name, hash_node);
cmp = pohmelfs_cmp_hash(tmp, hash);
if (cmp < 0)
n = n->rb_left;
else if (cmp > 0)
n = n->rb_right;
else
break;
}
return tmp;
}
struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash)
{
struct pohmelfs_name *tmp;
tmp = pohmelfs_search_hash_unprecise(pi, hash);
if (tmp && (tmp->hash == hash))
return tmp;
return NULL;
}
static void __pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node)
{
rb_erase(&node->hash_node, &parent->hash_root);
}
/*
* Remove name cache entry from its caches and free it.
*/
static void pohmelfs_name_free(struct pohmelfs_inode *parent, struct pohmelfs_name *node)
{
__pohmelfs_name_del(parent, node);
list_del(&node->sync_create_entry);
kfree(node);
}
static struct pohmelfs_name *pohmelfs_insert_hash(struct pohmelfs_inode *pi,
struct pohmelfs_name *new)
{
struct rb_node **n = &pi->hash_root.rb_node, *parent = NULL;
struct pohmelfs_name *ret = NULL, *tmp;
int cmp;
while (*n) {
parent = *n;
tmp = rb_entry(parent, struct pohmelfs_name, hash_node);
cmp = pohmelfs_cmp_hash(tmp, new->hash);
if (cmp < 0)
n = &parent->rb_left;
else if (cmp > 0)
n = &parent->rb_right;
else {
ret = tmp;
break;
}
}
if (ret) {
printk("%s: exist: parent: %llu, ino: %llu, hash: %x, len: %u, data: '%s', "
"new: ino: %llu, hash: %x, len: %u, data: '%s'.\n",
__func__, pi->ino,
ret->ino, ret->hash, ret->len, ret->data,
new->ino, new->hash, new->len, new->data);
ret->ino = new->ino;
return ret;
}
rb_link_node(&new->hash_node, parent, n);
rb_insert_color(&new->hash_node, &pi->hash_root);
return NULL;
}
/*
* Free name cache for given inode.
*/
void pohmelfs_free_names(struct pohmelfs_inode *parent)
{
struct rb_node *rb_node;
struct pohmelfs_name *n;
for (rb_node = rb_first(&parent->hash_root); rb_node;) {
n = rb_entry(rb_node, struct pohmelfs_name, hash_node);
rb_node = rb_next(rb_node);
pohmelfs_name_free(parent, n);
}
}
static void pohmelfs_fix_offset(struct pohmelfs_inode *parent, struct pohmelfs_name *node)
{
parent->total_len -= node->len;
}
/*
* Free name cache entry helper.
*/
void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node)
{
pohmelfs_fix_offset(parent, node);
pohmelfs_name_free(parent, node);
}
/*
* Insert new name cache entry into all hash cache.
*/
static int pohmelfs_insert_name(struct pohmelfs_inode *parent, struct pohmelfs_name *n)
{
struct pohmelfs_name *name;
name = pohmelfs_insert_hash(parent, n);
if (name)
return -EEXIST;
parent->total_len += n->len;
list_add_tail(&n->sync_create_entry, &parent->sync_create_list);
return 0;
}
/*
* Allocate new name cache entry.
*/
static struct pohmelfs_name *pohmelfs_name_alloc(unsigned int len)
{
struct pohmelfs_name *n;
n = kzalloc(sizeof(struct pohmelfs_name) + len, GFP_KERNEL);
if (!n)
return NULL;
INIT_LIST_HEAD(&n->sync_create_entry);
n->data = (char *)(n+1);
return n;
}
/*
* Add new name entry into directory's cache.
*/
static int pohmelfs_add_dir(struct pohmelfs_sb *psb, struct pohmelfs_inode *parent,
struct pohmelfs_inode *npi, struct qstr *str, unsigned int mode, int link)
{
int err = -ENOMEM;
struct pohmelfs_name *n;
n = pohmelfs_name_alloc(str->len + 1);
if (!n)
goto err_out_exit;
n->ino = npi->ino;
n->mode = mode;
n->len = str->len;
n->hash = str->hash;
sprintf(n->data, "%s", str->name);
mutex_lock(&parent->offset_lock);
err = pohmelfs_insert_name(parent, n);
mutex_unlock(&parent->offset_lock);
if (err) {
if (err != -EEXIST)
goto err_out_free;
kfree(n);
}
return 0;
err_out_free:
kfree(n);
err_out_exit:
return err;
}
/*
* Create new inode for given parameters (name, inode info, parent).
* This does not create object on the server, it will be synced there during writeback.
*/
struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb,
struct pohmelfs_inode *parent, struct qstr *str,
struct netfs_inode_info *info, int link)
{
struct inode *new = NULL;
struct pohmelfs_inode *npi;
int err = -EEXIST;
dprintk("%s: creating inode: parent: %llu, ino: %llu, str: %p.\n",
__func__, (parent) ? parent->ino : 0, info->ino, str);
err = -ENOMEM;
new = iget_locked(psb->sb, info->ino);
if (!new)
goto err_out_exit;
npi = POHMELFS_I(new);
npi->ino = info->ino;
err = 0;
if (new->i_state & I_NEW) {
dprintk("%s: filling VFS inode: %lu/%llu.\n",
__func__, new->i_ino, info->ino);
pohmelfs_fill_inode(new, info);
if (S_ISDIR(info->mode)) {
struct qstr s;
s.name = ".";
s.len = 1;
s.hash = jhash(s.name, s.len, 0);
err = pohmelfs_add_dir(psb, npi, npi, &s, info->mode, 0);
if (err)
goto err_out_put;
s.name = "..";
s.len = 2;
s.hash = jhash(s.name, s.len, 0);
err = pohmelfs_add_dir(psb, npi, (parent) ? parent : npi, &s,
(parent) ? parent->vfs_inode.i_mode : npi->vfs_inode.i_mode, 0);
if (err)
goto err_out_put;
}
}
if (str) {
if (parent) {
err = pohmelfs_add_dir(psb, parent, npi, str, info->mode, link);
dprintk("%s: %s inserted name: '%s', new_offset: %llu, ino: %llu, parent: %llu.\n",
__func__, (err) ? "unsuccessfully" : "successfully",
str->name, parent->total_len, info->ino, parent->ino);
if (err && err != -EEXIST)
goto err_out_put;
}
}
if (new->i_state & I_NEW) {
if (parent)
mark_inode_dirty(&parent->vfs_inode);
mark_inode_dirty(new);
}
set_bit(NETFS_INODE_OWNED, &npi->state);
npi->lock_type = POHMELFS_WRITE_LOCK;
unlock_new_inode(new);
return npi;
err_out_put:
printk("%s: putting inode: %p, npi: %p, error: %d.\n", __func__, new, npi, err);
iput(new);
err_out_exit:
return ERR_PTR(err);
}
static int pohmelfs_remote_sync_complete(struct page **pages, unsigned int page_num,
void *private, int err)
{
struct pohmelfs_inode *pi = private;
struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
dprintk("%s: ino: %llu, err: %d.\n", __func__, pi->ino, err);
if (err)
pi->error = err;
wake_up(&psb->wait);
pohmelfs_put_inode(pi);
return err;
}
/*
* Receive directory content from the server.
* This should be only done for objects, which were not created locally,
* and which were not synced previously.
*/
static int pohmelfs_sync_remote_dir(struct pohmelfs_inode *pi)
{
struct inode *inode = &pi->vfs_inode;
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
long ret = psb->wait_on_page_timeout;
int err;
dprintk("%s: dir: %llu, state: %lx: remote_synced: %d.\n",
__func__, pi->ino, pi->state, test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state));
if (test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state))
return 0;
if (!igrab(inode)) {
err = -ENOENT;
goto err_out_exit;
}
err = pohmelfs_meta_command(pi, NETFS_READDIR, NETFS_TRANS_SINGLE_DST,
pohmelfs_remote_sync_complete, pi, 0);
if (err)
goto err_out_exit;
pi->error = 0;
ret = wait_event_interruptible_timeout(psb->wait,
test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state) || pi->error, ret);
dprintk("%s: awake dir: %llu, ret: %ld, err: %d.\n", __func__, pi->ino, ret, pi->error);
if (ret <= 0) {
err = ret;
if (!err)
err = -ETIMEDOUT;
goto err_out_exit;
}
if (pi->error)
return pi->error;
return 0;
err_out_exit:
clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
return err;
}
static int pohmelfs_dir_open(struct inode *inode, struct file *file)
{
file->private_data = NULL;
return 0;
}
/*
* VFS readdir callback. Syncs directory content from server if needed,
* and provides direntry info to the userspace.
*/
static int pohmelfs_readdir(struct file *file, void *dirent, filldir_t filldir)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct pohmelfs_inode *pi = POHMELFS_I(inode);
struct pohmelfs_name *n;
struct rb_node *rb_node;
int err = 0, mode;
u64 len;
dprintk("%s: parent: %llu, fpos: %llu, hash: %08lx.\n",
__func__, pi->ino, (u64)file->f_pos,
(unsigned long)file->private_data);
#if 0
err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK);
if (err)
return err;
#endif
err = pohmelfs_sync_remote_dir(pi);
if (err)
return err;
if (file->private_data && (file->private_data == (void *)(unsigned long)file->f_pos))
return 0;
mutex_lock(&pi->offset_lock);
n = pohmelfs_search_hash_unprecise(pi, (unsigned long)file->private_data);
while (n) {
mode = (n->mode >> 12) & 15;
dprintk("%s: offset: %llu, parent ino: %llu, name: '%s', len: %u, ino: %llu, "
"mode: %o/%o, fpos: %llu, hash: %08x.\n",
__func__, file->f_pos, pi->ino, n->data, n->len,
n->ino, n->mode, mode, file->f_pos, n->hash);
file->private_data = (void *)(unsigned long)n->hash;
len = n->len;
err = filldir(dirent, n->data, n->len, file->f_pos, n->ino, mode);
if (err < 0) {
dprintk("%s: err: %d.\n", __func__, err);
err = 0;
break;
}
file->f_pos += len;
rb_node = rb_next(&n->hash_node);
if (!rb_node || (rb_node == &n->hash_node)) {
file->private_data = (void *)(unsigned long)file->f_pos;
break;
}
n = rb_entry(rb_node, struct pohmelfs_name, hash_node);
}
mutex_unlock(&pi->offset_lock);
return err;
}
static loff_t pohmelfs_dir_lseek(struct file *file, loff_t offset, int origin)
{
file->f_pos = offset;
file->private_data = NULL;
return offset;
}
const struct file_operations pohmelfs_dir_fops = {
.open = pohmelfs_dir_open,
.read = generic_read_dir,
.llseek = pohmelfs_dir_lseek,
.readdir = pohmelfs_readdir,
};
/*
* Lookup single object on server.
*/
static int pohmelfs_lookup_single(struct pohmelfs_inode *parent,
struct qstr *str, u64 ino)
{
struct pohmelfs_sb *psb = POHMELFS_SB(parent->vfs_inode.i_sb);
long ret = msecs_to_jiffies(5000);
int err;
set_bit(NETFS_COMMAND_PENDING, &parent->state);
err = pohmelfs_meta_command_data(parent, parent->ino, NETFS_LOOKUP,
(char *)str->name, NETFS_TRANS_SINGLE_DST, NULL, NULL, ino);
if (err)
goto err_out_exit;
err = 0;
ret = wait_event_interruptible_timeout(psb->wait,
!test_bit(NETFS_COMMAND_PENDING, &parent->state), ret);
if (ret <= 0) {
err = ret;
if (!err)
err = -ETIMEDOUT;
}
if (err)
goto err_out_exit;
return 0;
err_out_exit:
clear_bit(NETFS_COMMAND_PENDING, &parent->state);
printk("%s: failed: parent: %llu, ino: %llu, name: '%s', err: %d.\n",
__func__, parent->ino, ino, str->name, err);
return err;
}
/*
* VFS lookup callback.
* We first try to get inode number from local name cache, if we have one,
* then inode can be found in inode cache. If there is no inode or no object in
* local cache, try to lookup it on server. This only should be done for directories,
* which were not created locally, otherwise remote server does not know about dir at all,
* so no need to try to know that.
*/
struct dentry *pohmelfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct pohmelfs_inode *parent = POHMELFS_I(dir);
struct pohmelfs_name *n;
struct inode *inode = NULL;
unsigned long ino = 0;
int err, lock_type = POHMELFS_READ_LOCK, need_lock = 1;
struct qstr str = dentry->d_name;
if ((nd->intent.open.flags & O_ACCMODE) > 1)
lock_type = POHMELFS_WRITE_LOCK;
if (test_bit(NETFS_INODE_OWNED, &parent->state)) {
if (lock_type == parent->lock_type)
need_lock = 0;
if ((lock_type == POHMELFS_READ_LOCK) && (parent->lock_type == POHMELFS_WRITE_LOCK))
need_lock = 0;
}
if ((lock_type == POHMELFS_READ_LOCK) && !test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state))
need_lock = 1;
str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0);
mutex_lock(&parent->offset_lock);
n = pohmelfs_search_hash(parent, str.hash);
if (n)
ino = n->ino;
mutex_unlock(&parent->offset_lock);
dprintk("%s: start ino: %lu, inode: %p, name: '%s', hash: %x, parent_state: %lx, need_lock: %d.\n",
__func__, ino, inode, str.name, str.hash, parent->state, need_lock);
if (ino) {
inode = ilookup(dir->i_sb, ino);
if (inode)
goto out;
}
dprintk("%s: no inode dir: %p, dir_ino: %llu, name: '%s', len: %u, dir_state: %lx, ino: %lu.\n",
__func__, dir, parent->ino,
str.name, str.len, parent->state, ino);
if (!ino) {
if (!need_lock)
goto out;
}
err = pohmelfs_data_lock(parent, 0, ~0, lock_type);
if (err)
goto out;
err = pohmelfs_lookup_single(parent, &str, ino);
if (err)
goto out;
if (!ino) {
mutex_lock(&parent->offset_lock);
n = pohmelfs_search_hash(parent, str.hash);
if (n)
ino = n->ino;
mutex_unlock(&parent->offset_lock);
}
if (ino) {
inode = ilookup(dir->i_sb, ino);
dprintk("%s: second lookup ino: %lu, inode: %p, name: '%s', hash: %x.\n",
__func__, ino, inode, str.name, str.hash);
if (!inode) {
dprintk("%s: No inode for ino: %lu, name: '%s', hash: %x.\n",
__func__, ino, str.name, str.hash);
/* return NULL; */
return ERR_PTR(-EACCES);
}
} else {
printk("%s: No inode number : name: '%s', hash: %x.\n",
__func__, str.name, str.hash);
}
out:
return d_splice_alias(inode, dentry);
}
/*
* Create new object in local cache. Object will be synced to server
* during writeback for given inode.
*/
struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb,
struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode)
{
struct pohmelfs_inode *npi;
int err = -ENOMEM;
struct netfs_inode_info info;
dprintk("%s: name: '%s', mode: %o, start: %llu.\n",
__func__, str->name, mode, start);
info.mode = mode;
info.ino = start;
if (!start)
info.ino = pohmelfs_new_ino(psb);
info.nlink = S_ISDIR(mode) ? 2 : 1;
info.uid = current_fsuid();
info.gid = current_fsgid();
info.size = 0;
info.blocksize = 512;
info.blocks = 0;
info.rdev = 0;
info.version = 0;
npi = pohmelfs_new_inode(psb, parent, str, &info, !!start);
if (IS_ERR(npi)) {
err = PTR_ERR(npi);
goto err_out_unlock;
}
return npi;
err_out_unlock:
dprintk("%s: err: %d.\n", __func__, err);
return ERR_PTR(err);
}
/*
* Create local object and bind it to dentry.
*/
static int pohmelfs_create_entry(struct inode *dir, struct dentry *dentry, u64 start, int mode)
{
struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb);
struct pohmelfs_inode *npi, *parent;
struct qstr str = dentry->d_name;
int err;
parent = POHMELFS_I(dir);
err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK);
if (err)
return err;
str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0);
npi = pohmelfs_create_entry_local(psb, parent, &str, start, mode);
if (IS_ERR(npi))
return PTR_ERR(npi);
d_instantiate(dentry, &npi->vfs_inode);
dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n",
__func__, parent->ino, npi->ino, dentry->d_name.name,
(signed)dir->i_nlink, (signed)npi->vfs_inode.i_nlink);
return 0;
}
/*
* VFS create and mkdir callbacks.
*/
static int pohmelfs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
return pohmelfs_create_entry(dir, dentry, 0, mode);
}
static int pohmelfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
int err;
inode_inc_link_count(dir);
err = pohmelfs_create_entry(dir, dentry, 0, mode | S_IFDIR);
if (err)
inode_dec_link_count(dir);
return err;
}
static int pohmelfs_remove_entry(struct inode *dir, struct dentry *dentry)
{
struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb);
struct inode *inode = dentry->d_inode;
struct pohmelfs_inode *parent = POHMELFS_I(dir), *pi = POHMELFS_I(inode);
struct pohmelfs_name *n;
int err = -ENOENT;
struct qstr str = dentry->d_name;
err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK);
if (err)
return err;
str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0);
dprintk("%s: dir_ino: %llu, inode: %llu, name: '%s', nlink: %d.\n",
__func__, parent->ino, pi->ino,
str.name, (signed)inode->i_nlink);
BUG_ON(!inode);
mutex_lock(&parent->offset_lock);
n = pohmelfs_search_hash(parent, str.hash);
if (n) {
pohmelfs_fix_offset(parent, n);
if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
pohmelfs_remove_child(pi, n);
pohmelfs_name_free(parent, n);
err = 0;
}
mutex_unlock(&parent->offset_lock);
if (!err) {
psb->avail_size += inode->i_size;
pohmelfs_inode_del_inode(psb, pi);
mark_inode_dirty(dir);
inode->i_ctime = dir->i_ctime;
if (inode->i_nlink)
inode_dec_link_count(inode);
}
return err;
}
/*
* Unlink and rmdir VFS callbacks.
*/
static int pohmelfs_unlink(struct inode *dir, struct dentry *dentry)
{
return pohmelfs_remove_entry(dir, dentry);
}
static int pohmelfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int err;
struct inode *inode = dentry->d_inode;
dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n",
__func__, POHMELFS_I(dir)->ino, POHMELFS_I(inode)->ino,
dentry->d_name.name, (signed)dir->i_nlink, (signed)inode->i_nlink);
err = pohmelfs_remove_entry(dir, dentry);
if (!err) {
inode_dec_link_count(dir);
inode_dec_link_count(inode);
}
return err;
}
/*
* Link creation is synchronous.
* I'm lazy.
* Earth is somewhat round.
*/
static int pohmelfs_create_link(struct pohmelfs_inode *parent, struct qstr *obj,
struct pohmelfs_inode *target, struct qstr *tstr)
{
struct super_block *sb = parent->vfs_inode.i_sb;
struct pohmelfs_sb *psb = POHMELFS_SB(sb);
struct netfs_cmd *cmd;
struct netfs_trans *t;
void *data;
int err, parent_len, target_len = 0, cur_len, path_size = 0;
err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK);
if (err)
return err;
err = sb->s_op->write_inode(&parent->vfs_inode, 0);
if (err)
goto err_out_exit;
if (tstr)
target_len = tstr->len;
parent_len = pohmelfs_path_length(parent);
if (target)
target_len += pohmelfs_path_length(target);
if (parent_len < 0) {
err = parent_len;
goto err_out_exit;
}
if (target_len < 0) {
err = target_len;
goto err_out_exit;
}
t = netfs_trans_alloc(psb, parent_len + target_len + obj->len + 2, 0, 0);
if (!t) {
err = -ENOMEM;
goto err_out_exit;
}
cur_len = netfs_trans_cur_len(t);
cmd = netfs_trans_current(t);
if (IS_ERR(cmd)) {
err = PTR_ERR(cmd);
goto err_out_free;
}
data = (void *)(cmd + 1);
cur_len -= sizeof(struct netfs_cmd);
err = pohmelfs_construct_path_string(parent, data, parent_len);
if (err > 0) {
/* Do not place null-byte before the slash */
path_size = err - 1;
cur_len -= path_size;
err = snprintf(data + path_size, cur_len, "/%s|", obj->name);
path_size += err;
cur_len -= err;
cmd->ext = path_size - 1; /* No | symbol */
if (target) {
err = pohmelfs_construct_path_string(target, data + path_size, target_len);
if (err > 0) {
path_size += err;
cur_len -= err;
}
}
}
if (err < 0)
goto err_out_free;
cmd->start = 0;
if (!target && tstr) {
if (tstr->len > cur_len - 1) {
err = -ENAMETOOLONG;
goto err_out_free;
}
err = snprintf(data + path_size, cur_len, "%s", tstr->name) + 1; /* 0-byte */
path_size += err;
cur_len -= err;
cmd->start = 1;
}
dprintk("%s: parent: %llu, obj: '%s', target_inode: %llu, target_str: '%s', full: '%s'.\n",
__func__, parent->ino, obj->name, (target) ? target->ino : 0, (tstr) ? tstr->name : NULL,
(char *)data);
cmd->cmd = NETFS_LINK;
cmd->size = path_size;
cmd->id = parent->ino;
netfs_convert_cmd(cmd);
netfs_trans_update(cmd, t, path_size);
err = netfs_trans_finish(t, psb);
if (err)
goto err_out_exit;
return 0;
err_out_free:
t->result = err;
netfs_trans_put(t);
err_out_exit:
return err;
}
/*
* VFS hard and soft link callbacks.
*/
static int pohmelfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
struct pohmelfs_inode *pi = POHMELFS_I(inode);
int err;
struct qstr str = dentry->d_name;
str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0);
err = inode->i_sb->s_op->write_inode(inode, 0);
if (err)
return err;
err = pohmelfs_create_link(POHMELFS_I(dir), &str, pi, NULL);
if (err)
return err;
return pohmelfs_create_entry(dir, dentry, pi->ino, inode->i_mode);
}
static int pohmelfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
struct qstr sym_str;
struct qstr str = dentry->d_name;
struct inode *inode;
int err;
str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0);
sym_str.name = symname;
sym_str.len = strlen(symname);
err = pohmelfs_create_link(POHMELFS_I(dir), &str, NULL, &sym_str);
if (err)
goto err_out_exit;
err = pohmelfs_create_entry(dir, dentry, 0, S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO);
if (err)
goto err_out_exit;
inode = dentry->d_inode;
err = page_symlink(inode, symname, sym_str.len + 1);
if (err)
goto err_out_put;
return 0;
err_out_put:
iput(inode);
err_out_exit:
return err;
}
static int pohmelfs_send_rename(struct pohmelfs_inode *pi, struct pohmelfs_inode *parent,
struct qstr *str)
{
int path_len, err, total_len = 0, inode_len, parent_len;
char *path;
struct netfs_trans *t;
struct netfs_cmd *cmd;
struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
parent_len = pohmelfs_path_length(parent);
inode_len = pohmelfs_path_length(pi);
if (parent_len < 0 || inode_len < 0)
return -EINVAL;
path_len = parent_len + inode_len + str->len + 3;
t = netfs_trans_alloc(psb, path_len, 0, 0);
if (!t)
return -ENOMEM;
cmd = netfs_trans_current(t);
path = (char *)(cmd + 1);
err = pohmelfs_construct_path_string(pi, path, inode_len);
if (err < 0)
goto err_out_unlock;
cmd->ext = err;
path += err;
total_len += err;
path_len -= err;
*path = '|';
path++;
total_len++;
path_len--;
err = pohmelfs_construct_path_string(parent, path, parent_len);
if (err < 0)
goto err_out_unlock;
/*
* Do not place a null-byte before the final slash and the name.
*/
err--;
path += err;
total_len += err;
path_len -= err;
err = snprintf(path, path_len - 1, "/%s", str->name);
total_len += err + 1; /* 0 symbol */
path_len -= err + 1;
cmd->cmd = NETFS_RENAME;
cmd->id = pi->ino;
cmd->start = parent->ino;
cmd->size = total_len;
netfs_convert_cmd(cmd);
netfs_trans_update(cmd, t, total_len);
return netfs_trans_finish(t, psb);
err_out_unlock:
netfs_trans_free(t);
return err;
}
static int pohmelfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct inode *inode = old_dentry->d_inode;
struct pohmelfs_inode *old_parent, *pi, *new_parent;
struct qstr str = new_dentry->d_name;
struct pohmelfs_name *n;
unsigned int old_hash;
int err = -ENOENT;
pi = POHMELFS_I(inode);
old_parent = POHMELFS_I(old_dir);
if (new_dir)
new_dir->i_sb->s_op->write_inode(new_dir, 0);
old_hash = jhash(old_dentry->d_name.name, old_dentry->d_name.len, 0);
str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0);
str.len = new_dentry->d_name.len;
str.name = new_dentry->d_name.name;
str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0);
if (new_dir) {
new_parent = POHMELFS_I(new_dir);
err = -ENOTEMPTY;
if (S_ISDIR(inode->i_mode) &&
new_parent->total_len <= 3)
goto err_out_exit;
} else {
new_parent = old_parent;
}
dprintk("%s: ino: %llu, parent: %llu, name: '%s' -> parent: %llu, name: '%s', i_size: %llu.\n",
__func__, pi->ino, old_parent->ino, old_dentry->d_name.name,
new_parent->ino, new_dentry->d_name.name, inode->i_size);
if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state) &&
test_bit(NETFS_INODE_OWNED, &pi->state)) {
err = pohmelfs_send_rename(pi, new_parent, &str);
if (err)
goto err_out_exit;
}
n = pohmelfs_name_alloc(str.len + 1);
if (!n)
goto err_out_exit;
mutex_lock(&new_parent->offset_lock);
n->ino = pi->ino;
n->mode = inode->i_mode;
n->len = str.len;
n->hash = str.hash;
sprintf(n->data, "%s", str.name);
err = pohmelfs_insert_name(new_parent, n);
mutex_unlock(&new_parent->offset_lock);
if (err)
goto err_out_exit;
mutex_lock(&old_parent->offset_lock);
n = pohmelfs_search_hash(old_parent, old_hash);
if (n)
pohmelfs_name_del(old_parent, n);
mutex_unlock(&old_parent->offset_lock);
mark_inode_dirty(inode);
mark_inode_dirty(&new_parent->vfs_inode);
WARN_ON_ONCE(list_empty(&inode->i_dentry));
return 0;
err_out_exit:
clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
return err;
}
/*
* POHMELFS directory inode operations.
*/
const struct inode_operations pohmelfs_dir_inode_ops = {
.link = pohmelfs_link,
.symlink = pohmelfs_symlink,
.unlink = pohmelfs_unlink,
.mkdir = pohmelfs_mkdir,
.rmdir = pohmelfs_rmdir,
.create = pohmelfs_create,
.lookup = pohmelfs_lookup,
.setattr = pohmelfs_setattr,
.rename = pohmelfs_rename,
};