diff options
Diffstat (limited to 'drivers/staging/pohmelfs/netfs.h')
| -rw-r--r-- | drivers/staging/pohmelfs/netfs.h | 919 |
1 files changed, 0 insertions, 919 deletions
diff --git a/drivers/staging/pohmelfs/netfs.h b/drivers/staging/pohmelfs/netfs.h deleted file mode 100644 index f26894f2a57f..000000000000 --- a/drivers/staging/pohmelfs/netfs.h +++ /dev/null @@ -1,919 +0,0 @@ -/* - * 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, umode_t 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 */ |