diff options
Diffstat (limited to 'drivers/staging/pohmelfs/netfs.h')
| -rw-r--r-- | drivers/staging/pohmelfs/netfs.h | 932 |
1 files changed, 932 insertions, 0 deletions
diff --git a/drivers/staging/pohmelfs/netfs.h b/drivers/staging/pohmelfs/netfs.h new file mode 100644 index 000000000000..2ff21ae5bb12 --- /dev/null +++ b/drivers/staging/pohmelfs/netfs.h @@ -0,0 +1,932 @@ +/* + * 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> + +#define POHMELFS_CN_IDX 5 +#define POHMELFS_CN_VAL 0 + +#define POHMELFS_CTLINFO_ACK 1 +#define POHMELFS_NOINFO_ACK 2 + + +/* + * 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 */ +}; + +/* + * 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 */ +}; + +/* + * Configuration command used to create table of different remote servers. + */ +struct pohmelfs_ctl +{ + unsigned int idx; /* Config index */ + unsigned int type; /* Socket type */ + unsigned int proto; /* Socket protocol */ + unsigned int addrlen; /* Size of the address */ + unsigned short unused; /* Align structure by 4 bytes */ + 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 informaion (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; + + /* + * 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); +} + +int pohmelfs_ftrans_init(void); +void pohmelfs_ftrans_exit(void); +void pohmelfs_ftrans_update(u64 id); +int pohmelfs_ftrans_check(u64 id); +void pohmelfs_ftrans_clean(u64 id); + +#endif /* __KERNEL__*/ + +#endif /* __NETFS_H */ |