- 根目录:
- drivers
- staging
- pohmelfs
- netfs.h
/*
* 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.
*/
#ifndef __NETFS_H
#define __NETFS_H
#include <linux/types.h>
#include <linux/connector.h>
#include <linux/backing-dev.h>
#define POHMELFS_CN_IDX 5
#define POHMELFS_CN_VAL 0
#define POHMELFS_CTLINFO_ACK 1
#define POHMELFS_NOINFO_ACK 2
#define POHMELFS_NULL_IDX 65535
/*
* Network command structure.
* Will be extended.
*/
struct netfs_cmd {
__u16 cmd; /* Command number */
__u16 csize; /* Attached crypto information size */
__u16 cpad; /* Attached padding size */
__u16 ext; /* External flags */
__u32 size; /* Size of the attached data */
__u32 trans; /* Transaction id */
__u64 id; /* Object ID to operate on. Used for feedback.*/
__u64 start; /* Start of the object. */
__u64 iv; /* IV sequence */
__u8 data[0];
};
static inline void netfs_convert_cmd(struct netfs_cmd *cmd)
{
cmd->id = __be64_to_cpu(cmd->id);
cmd->start = __be64_to_cpu(cmd->start);
cmd->iv = __be64_to_cpu(cmd->iv);
cmd->cmd = __be16_to_cpu(cmd->cmd);
cmd->ext = __be16_to_cpu(cmd->ext);
cmd->csize = __be16_to_cpu(cmd->csize);
cmd->cpad = __be16_to_cpu(cmd->cpad);
cmd->size = __be32_to_cpu(cmd->size);
}
#define NETFS_TRANS_SINGLE_DST (1<<0)
enum {
NETFS_READDIR = 1, /* Read directory for given inode number */
NETFS_READ_PAGE, /* Read data page from the server */
NETFS_WRITE_PAGE, /* Write data page to the server */
NETFS_CREATE, /* Create directory entry */
NETFS_REMOVE, /* Remove directory entry */
NETFS_LOOKUP, /* Lookup single object */
NETFS_LINK, /* Create a link */
NETFS_TRANS, /* Transaction */
NETFS_OPEN, /* Open intent */
NETFS_INODE_INFO, /* Metadata cache coherency synchronization message */
NETFS_PAGE_CACHE, /* Page cache invalidation message */
NETFS_READ_PAGES, /* Read multiple contiguous pages in one go */
NETFS_RENAME, /* Rename object */
NETFS_CAPABILITIES, /* Capabilities of the client, for example supported crypto */
NETFS_LOCK, /* Distributed lock message */
NETFS_XATTR_SET, /* Set extended attribute */
NETFS_XATTR_GET, /* Get extended attribute */
NETFS_CMD_MAX
};
enum {
POHMELFS_FLAGS_ADD = 0, /* Network state control message for ADD */
POHMELFS_FLAGS_DEL, /* Network state control message for DEL */
POHMELFS_FLAGS_SHOW, /* Network state control message for SHOW */
POHMELFS_FLAGS_CRYPTO, /* Crypto data control message */
POHMELFS_FLAGS_MODIFY, /* Network state modification message */
POHMELFS_FLAGS_DUMP, /* Network state control message for SHOW ALL */
POHMELFS_FLAGS_FLUSH, /* Network state control message for FLUSH */
};
/*
* Always wanted to copy it from socket headers into public one,
* since they are __KERNEL__ protected there.
*/
#define _K_SS_MAXSIZE 128
struct saddr {
unsigned short sa_family;
char addr[_K_SS_MAXSIZE];
};
enum {
POHMELFS_CRYPTO_HASH = 0,
POHMELFS_CRYPTO_CIPHER,
};
struct pohmelfs_crypto {
unsigned int idx; /* Config index */
unsigned short strlen; /* Size of the attached crypto string including 0-byte
* "cbc(aes)" for example */
unsigned short type; /* HMAC, cipher, both */
unsigned int keysize; /* Key size */
unsigned char data[0]; /* Algorithm string, key and IV */
};
#define POHMELFS_IO_PERM_READ (1<<0)
#define POHMELFS_IO_PERM_WRITE (1<<1)
/*
* Configuration command used to create table of different remote servers.
*/
struct pohmelfs_ctl {
__u32 idx; /* Config index */
__u32 type; /* Socket type */
__u32 proto; /* Socket protocol */
__u16 addrlen; /* Size of the address */
__u16 perm; /* IO permission */
__u16 prio; /* IO priority */
struct saddr addr; /* Remote server address */
};
/*
* Ack for userspace about requested command.
*/
struct pohmelfs_cn_ack {
struct cn_msg msg;
int error;
int msg_num;
int unused[3];
struct pohmelfs_ctl ctl;
};
/*
* Inode info structure used to sync with server.
* Check what stat() returns.
*/
struct netfs_inode_info {
unsigned int mode;
unsigned int nlink;
unsigned int uid;
unsigned int gid;
unsigned int blocksize;
unsigned int padding;
__u64 ino;
__u64 blocks;
__u64 rdev;
__u64 size;
__u64 version;
};
static inline void netfs_convert_inode_info(struct netfs_inode_info *info)
{
info->mode = __cpu_to_be32(info->mode);
info->nlink = __cpu_to_be32(info->nlink);
info->uid = __cpu_to_be32(info->uid);
info->gid = __cpu_to_be32(info->gid);
info->blocksize = __cpu_to_be32(info->blocksize);
info->blocks = __cpu_to_be64(info->blocks);
info->rdev = __cpu_to_be64(info->rdev);
info->size = __cpu_to_be64(info->size);
info->version = __cpu_to_be64(info->version);
info->ino = __cpu_to_be64(info->ino);
}
/*
* Cache state machine.
*/
enum {
NETFS_COMMAND_PENDING = 0, /* Command is being executed */
NETFS_INODE_REMOTE_SYNCED, /* Inode was synced to server */
NETFS_INODE_REMOTE_DIR_SYNCED, /* Inode (directory) was synced from the server */
NETFS_INODE_OWNED, /* Inode is owned by given host */
NETFS_INODE_NEED_FLUSH, /* Inode has to be flushed to the server */
};
/*
* POHMELFS capabilities: information about supported
* crypto operations (hash/cipher, modes, key sizes and so on),
* root information (used/available size, number of objects, permissions)
*/
enum pohmelfs_capabilities {
POHMELFS_CRYPTO_CAPABILITIES = 0,
POHMELFS_ROOT_CAPABILITIES,
};
/* Read-only mount */
#define POHMELFS_FLAGS_RO (1<<0)
/* Extended attributes support on/off */
#define POHMELFS_FLAGS_XATTR (1<<1)
struct netfs_root_capabilities {
__u64 nr_files;
__u64 used, avail;
__u64 flags;
};
static inline void netfs_convert_root_capabilities(struct netfs_root_capabilities *cap)
{
cap->nr_files = __cpu_to_be64(cap->nr_files);
cap->used = __cpu_to_be64(cap->used);
cap->avail = __cpu_to_be64(cap->avail);
cap->flags = __cpu_to_be64(cap->flags);
}
struct netfs_crypto_capabilities {
unsigned short hash_strlen; /* Hash string length, like "hmac(sha1) including 0 byte "*/
unsigned short cipher_strlen; /* Cipher string length with the same format */
unsigned int cipher_keysize; /* Cipher key size */
};
static inline void netfs_convert_crypto_capabilities(struct netfs_crypto_capabilities *cap)
{
cap->hash_strlen = __cpu_to_be16(cap->hash_strlen);
cap->cipher_strlen = __cpu_to_be16(cap->cipher_strlen);
cap->cipher_keysize = __cpu_to_be32(cap->cipher_keysize);
}
enum pohmelfs_lock_type {
POHMELFS_LOCK_GRAB = (1<<15),
POHMELFS_READ_LOCK = 0,
POHMELFS_WRITE_LOCK,
};
struct netfs_lock {
__u64 start;
__u64 ino;
__u32 size;
__u32 type;
};
static inline void netfs_convert_lock(struct netfs_lock *lock)
{
lock->start = __cpu_to_be64(lock->start);
lock->ino = __cpu_to_be64(lock->ino);
lock->size = __cpu_to_be32(lock->size);
lock->type = __cpu_to_be32(lock->type);
}
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/completion.h>
#include <linux/rbtree.h>
#include <linux/net.h>
#include <linux/poll.h>
/*
* Private POHMELFS cache of objects in directory.
*/
struct pohmelfs_name {
struct rb_node hash_node;
struct list_head sync_create_entry;
u64 ino;
u32 hash;
u32 mode;
u32 len;
char *data;
};
/*
* POHMELFS inode. Main object.
*/
struct pohmelfs_inode {
struct list_head inode_entry; /* Entry in superblock list.
* Objects which are not bound to dentry require to be dropped
* in ->put_super()
*/
struct rb_root hash_root; /* The same, but indexed by name hash and len */
struct mutex offset_lock; /* Protect both above trees */
struct list_head sync_create_list; /* List of created but not yet synced to the server children */
unsigned int drop_count;
int lock_type; /* How this inode is locked: read or write */
int error; /* Transaction error for given inode */
long state; /* State machine above */
u64 ino; /* Inode number */
u64 total_len; /* Total length of all children names, used to create offsets */
struct inode vfs_inode;
};
struct netfs_trans;
typedef int (*netfs_trans_complete_t)(struct page **pages, unsigned int page_num,
void *private, int err);
struct netfs_state;
struct pohmelfs_sb;
struct netfs_trans {
/*
* Transaction header and attached contiguous data live here.
*/
struct iovec iovec;
/*
* Pages attached to transaction.
*/
struct page **pages;
/*
* List and protecting lock for transaction destination
* network states.
*/
spinlock_t dst_lock;
struct list_head dst_list;
/*
* Number of users for given transaction.
* For example each network state attached to transaction
* via dst_list increases it.
*/
atomic_t refcnt;
/*
* Number of pages attached to given transaction.
* Some slots in above page array can be NULL, since
* for example page can be under writeback already,
* so we skip it in this transaction.
*/
unsigned int page_num;
/*
* Transaction flags: single dst or broadcast and so on.
*/
unsigned int flags;
/*
* Size of the data, which can be placed into
* iovec.iov_base area.
*/
unsigned int total_size;
/*
* Number of pages to be sent to remote server.
* Usually equal to above page_num, but in case of partial
* writeback it can accumulate only pages already completed
* previous writeback.
*/
unsigned int attached_pages;
/*
* Attached number of bytes in all above pages.
*/
unsigned int attached_size;
/*
* Unique transacton generation number.
* Used as identity in the network state tree of transactions.
*/
unsigned int gen;
/*
* Transaction completion status.
*/
int result;
/*
* Superblock this transaction belongs to
*/
struct pohmelfs_sb *psb;
/*
* Crypto engine, which processed this transaction.
* Can be not NULL only if crypto engine holds encrypted pages.
*/
struct pohmelfs_crypto_engine *eng;
/* Private data */
void *private;
/* Completion callback, invoked just before transaction is destroyed */
netfs_trans_complete_t complete;
};
static inline int netfs_trans_cur_len(struct netfs_trans *t)
{
return (signed)(t->total_size - t->iovec.iov_len);
}
static inline void *netfs_trans_current(struct netfs_trans *t)
{
return t->iovec.iov_base + t->iovec.iov_len;
}
struct netfs_trans *netfs_trans_alloc(struct pohmelfs_sb *psb, unsigned int size,
unsigned int flags, unsigned int nr);
void netfs_trans_free(struct netfs_trans *t);
int netfs_trans_finish(struct netfs_trans *t, struct pohmelfs_sb *psb);
int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb);
static inline void netfs_trans_reset(struct netfs_trans *t)
{
t->complete = NULL;
}
struct netfs_trans_dst {
struct list_head trans_entry;
struct rb_node state_entry;
unsigned long send_time;
/*
* Times this transaction was resent to its old or new,
* depending on flags, destinations. When it reaches maximum
* allowed number, specified in superblock->trans_retries,
* transaction will be freed with ETIMEDOUT error.
*/
unsigned int retries;
struct netfs_trans *trans;
struct netfs_state *state;
};
struct netfs_trans_dst *netfs_trans_search(struct netfs_state *st, unsigned int gen);
void netfs_trans_drop_dst(struct netfs_trans_dst *dst);
void netfs_trans_drop_dst_nostate(struct netfs_trans_dst *dst);
void netfs_trans_drop_trans(struct netfs_trans *t, struct netfs_state *st);
void netfs_trans_drop_last(struct netfs_trans *t, struct netfs_state *st);
int netfs_trans_resend(struct netfs_trans *t, struct pohmelfs_sb *psb);
int netfs_trans_remove_nolock(struct netfs_trans_dst *dst, struct netfs_state *st);
int netfs_trans_init(void);
void netfs_trans_exit(void);
struct pohmelfs_crypto_engine {
u64 iv; /* Crypto IV for current operation */
unsigned long timeout; /* Crypto waiting timeout */
unsigned int size; /* Size of crypto scratchpad */
void *data; /* Temporal crypto scratchpad */
/*
* Crypto operations performed on objects.
*/
struct crypto_hash *hash;
struct crypto_ablkcipher *cipher;
struct pohmelfs_crypto_thread *thread; /* Crypto thread which hosts this engine */
struct page **pages;
unsigned int page_num;
};
struct pohmelfs_crypto_thread {
struct list_head thread_entry;
struct task_struct *thread;
struct pohmelfs_sb *psb;
struct pohmelfs_crypto_engine eng;
struct netfs_trans *trans;
wait_queue_head_t wait;
int error;
unsigned int size;
struct page *page;
};
void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th);
/*
* Network state, attached to one server.
*/
struct netfs_state {
struct mutex __state_lock; /* Can not allow to use the same socket simultaneously */
struct mutex __state_send_lock;
struct netfs_cmd cmd; /* Cached command */
struct netfs_inode_info info; /* Cached inode info */
void *data; /* Cached some data */
unsigned int size; /* Size of that data */
struct pohmelfs_sb *psb; /* Superblock */
struct task_struct *thread; /* Async receiving thread */
/* Waiting/polling machinery */
wait_queue_t wait;
wait_queue_head_t *whead;
wait_queue_head_t thread_wait;
struct mutex trans_lock;
struct rb_root trans_root;
struct pohmelfs_ctl ctl; /* Remote peer */
struct socket *socket; /* Socket object */
struct socket *read_socket; /* Cached pointer to socket object.
* Used to determine if between lock drops socket was changed.
* Never used to read data or any kind of access.
*/
/*
* Crypto engines to process incoming data.
*/
struct pohmelfs_crypto_engine eng;
int need_reset;
};
int netfs_state_init(struct netfs_state *st);
void netfs_state_exit(struct netfs_state *st);
static inline void netfs_state_lock_send(struct netfs_state *st)
{
mutex_lock(&st->__state_send_lock);
}
static inline int netfs_state_trylock_send(struct netfs_state *st)
{
return mutex_trylock(&st->__state_send_lock);
}
static inline void netfs_state_unlock_send(struct netfs_state *st)
{
BUG_ON(!mutex_is_locked(&st->__state_send_lock));
mutex_unlock(&st->__state_send_lock);
}
static inline void netfs_state_lock(struct netfs_state *st)
{
mutex_lock(&st->__state_lock);
}
static inline void netfs_state_unlock(struct netfs_state *st)
{
BUG_ON(!mutex_is_locked(&st->__state_lock));
mutex_unlock(&st->__state_lock);
}
static inline unsigned int netfs_state_poll(struct netfs_state *st)
{
unsigned int revents = POLLHUP | POLLERR;
netfs_state_lock(st);
if (st->socket)
revents = st->socket->ops->poll(NULL, st->socket, NULL);
netfs_state_unlock(st);
return revents;
}
struct pohmelfs_config;
struct pohmelfs_sb {
struct rb_root mcache_root;
struct mutex mcache_lock;
atomic_long_t mcache_gen;
unsigned long mcache_timeout;
unsigned int idx;
unsigned int trans_retries;
atomic_t trans_gen;
unsigned int crypto_attached_size;
unsigned int crypto_align_size;
unsigned int crypto_fail_unsupported;
unsigned int crypto_thread_num;
struct list_head crypto_active_list, crypto_ready_list;
struct mutex crypto_thread_lock;
unsigned int trans_max_pages;
unsigned long trans_data_size;
unsigned long trans_timeout;
unsigned long drop_scan_timeout;
unsigned long trans_scan_timeout;
unsigned long wait_on_page_timeout;
struct list_head flush_list;
struct list_head drop_list;
spinlock_t ino_lock;
u64 ino;
/*
* Remote nodes POHMELFS connected to.
*/
struct list_head state_list;
struct mutex state_lock;
/*
* Currently active state to request data from.
*/
struct pohmelfs_config *active_state;
wait_queue_head_t wait;
/*
* Timed checks: stale transactions, inodes to be freed and so on.
*/
struct delayed_work dwork;
struct delayed_work drop_dwork;
struct super_block *sb;
struct backing_dev_info bdi;
/*
* Algorithm strings.
*/
char *hash_string;
char *cipher_string;
u8 *hash_key;
u8 *cipher_key;
/*
* Algorithm string lengths.
*/
unsigned int hash_strlen;
unsigned int cipher_strlen;
unsigned int hash_keysize;
unsigned int cipher_keysize;
/*
* Controls whether to perfrom crypto processing or not.
*/
int perform_crypto;
/*
* POHMELFS statistics.
*/
u64 total_size;
u64 avail_size;
atomic_long_t total_inodes;
/*
* Xattr support, read-only and so on.
*/
u64 state_flags;
/*
* Temporary storage to detect changes in the wait queue.
*/
long flags;
};
static inline void netfs_trans_update(struct netfs_cmd *cmd,
struct netfs_trans *t, unsigned int size)
{
unsigned int sz = ALIGN(size, t->psb->crypto_align_size);
t->iovec.iov_len += sizeof(struct netfs_cmd) + sz;
cmd->cpad = __cpu_to_be16(sz - size);
}
static inline struct pohmelfs_sb *POHMELFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline struct pohmelfs_inode *POHMELFS_I(struct inode *inode)
{
return container_of(inode, struct pohmelfs_inode, vfs_inode);
}
static inline u64 pohmelfs_new_ino(struct pohmelfs_sb *psb)
{
u64 ino;
spin_lock(&psb->ino_lock);
ino = psb->ino++;
spin_unlock(&psb->ino_lock);
return ino;
}
static inline void pohmelfs_put_inode(struct pohmelfs_inode *pi)
{
struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
spin_lock(&psb->ino_lock);
list_move_tail(&pi->inode_entry, &psb->drop_list);
pi->drop_count++;
spin_unlock(&psb->ino_lock);
}
struct pohmelfs_config {
struct list_head config_entry;
struct netfs_state state;
};
struct pohmelfs_config_group {
/*
* Entry in the global config group list.
*/
struct list_head group_entry;
/*
* Index of the current group.
*/
unsigned int idx;
/*
* Number of config_list entries in this group entry.
*/
unsigned int num_entry;
/*
* Algorithm strings.
*/
char *hash_string;
char *cipher_string;
/*
* Algorithm string lengths.
*/
unsigned int hash_strlen;
unsigned int cipher_strlen;
/*
* Key and its size.
*/
unsigned int hash_keysize;
unsigned int cipher_keysize;
u8 *hash_key;
u8 *cipher_key;
/*
* List of config entries (network state info) for given idx.
*/
struct list_head config_list;
};
int __init pohmelfs_config_init(void);
void pohmelfs_config_exit(void);
int pohmelfs_copy_config(struct pohmelfs_sb *psb);
int pohmelfs_copy_crypto(struct pohmelfs_sb *psb);
int pohmelfs_config_check(struct pohmelfs_config *config, int idx);
int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf);
extern const struct file_operations pohmelfs_dir_fops;
extern const struct inode_operations pohmelfs_dir_inode_ops;
int pohmelfs_state_init(struct pohmelfs_sb *psb);
void pohmelfs_state_exit(struct pohmelfs_sb *psb);
void pohmelfs_state_flush_transactions(struct netfs_state *st);
void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info);
void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
void pohmelfs_free_names(struct pohmelfs_inode *parent);
struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash);
void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi);
struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb,
struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode);
int pohmelfs_write_create_inode(struct pohmelfs_inode *pi);
int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans);
int pohmelfs_remove_child(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb,
struct pohmelfs_inode *parent, struct qstr *str,
struct netfs_inode_info *info, int link);
int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr);
int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr);
int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags,
netfs_trans_complete_t complete, void *priv, u64 start);
int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon,
unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start);
void pohmelfs_check_states(struct pohmelfs_sb *psb);
void pohmelfs_switch_active(struct pohmelfs_sb *psb);
int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len);
int pohmelfs_path_length(struct pohmelfs_inode *pi);
struct pohmelfs_crypto_completion {
struct completion complete;
int error;
};
int pohmelfs_trans_crypt(struct netfs_trans *t, struct pohmelfs_sb *psb);
void pohmelfs_crypto_exit(struct pohmelfs_sb *psb);
int pohmelfs_crypto_init(struct pohmelfs_sb *psb);
int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb);
void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e);
int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 iv,
void *data, struct page *page, unsigned int size);
int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e,
struct page *page, unsigned int size, u64 iv);
static inline u64 pohmelfs_gen_iv(struct netfs_trans *t)
{
u64 iv = t->gen;
iv <<= 32;
iv |= ((unsigned long)t) & 0xffffffff;
return iv;
}
int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
int pohmelfs_data_lock_response(struct netfs_state *st);
static inline int pohmelfs_need_lock(struct pohmelfs_inode *pi, int type)
{
if (test_bit(NETFS_INODE_OWNED, &pi->state)) {
if (type == pi->lock_type)
return 0;
if ((type == POHMELFS_READ_LOCK) && (pi->lock_type == POHMELFS_WRITE_LOCK))
return 0;
}
if (!test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
return 0;
return 1;
}
int __init pohmelfs_mcache_init(void);
void pohmelfs_mcache_exit(void);
/* #define CONFIG_POHMELFS_DEBUG */
#ifdef CONFIG_POHMELFS_DEBUG
#define dprintka(f, a...) printk(f, ##a)
#define dprintk(f, a...) printk("%d: " f, task_pid_vnr(current), ##a)
#else
#define dprintka(f, a...) do {} while (0)
#define dprintk(f, a...) do {} while (0)
#endif
static inline void netfs_trans_get(struct netfs_trans *t)
{
atomic_inc(&t->refcnt);
}
static inline void netfs_trans_put(struct netfs_trans *t)
{
if (atomic_dec_and_test(&t->refcnt)) {
dprintk("%s: t: %p, gen: %u, err: %d.\n",
__func__, t, t->gen, t->result);
if (t->complete)
t->complete(t->pages, t->page_num,
t->private, t->result);
netfs_trans_free(t);
}
}
struct pohmelfs_mcache {
struct rb_node mcache_entry;
struct completion complete;
atomic_t refcnt;
u64 gen;
void *data;
u64 start;
u32 size;
int err;
struct netfs_inode_info info;
};
struct pohmelfs_mcache *pohmelfs_mcache_alloc(struct pohmelfs_sb *psb, u64 start,
unsigned int size, void *data);
void pohmelfs_mcache_free(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
struct pohmelfs_mcache *pohmelfs_mcache_search(struct pohmelfs_sb *psb, u64 gen);
void pohmelfs_mcache_remove_locked(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
static inline void pohmelfs_mcache_get(struct pohmelfs_mcache *m)
{
atomic_inc(&m->refcnt);
}
static inline void pohmelfs_mcache_put(struct pohmelfs_sb *psb,
struct pohmelfs_mcache *m)
{
if (atomic_dec_and_test(&m->refcnt))
pohmelfs_mcache_free(psb, m);
}
/*#define POHMELFS_TRUNCATE_ON_INODE_FLUSH
*/
#endif /* __KERNEL__*/
#endif /* __NETFS_H */