2 * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
19 #include <linux/types.h>
20 #include <linux/connector.h>
22 #define POHMELFS_CN_IDX 5
23 #define POHMELFS_CN_VAL 0
25 #define POHMELFS_CTLINFO_ACK 1
26 #define POHMELFS_NOINFO_ACK 2
30 * Network command structure.
35 __u16 cmd; /* Command number */
36 __u16 csize; /* Attached crypto information size */
37 __u16 cpad; /* Attached padding size */
38 __u16 ext; /* External flags */
39 __u32 size; /* Size of the attached data */
40 __u32 trans; /* Transaction id */
41 __u64 id; /* Object ID to operate on. Used for feedback.*/
42 __u64 start; /* Start of the object. */
43 __u64 iv; /* IV sequence */
47 static inline void netfs_convert_cmd(struct netfs_cmd *cmd)
49 cmd->id = __be64_to_cpu(cmd->id);
50 cmd->start = __be64_to_cpu(cmd->start);
51 cmd->iv = __be64_to_cpu(cmd->iv);
52 cmd->cmd = __be16_to_cpu(cmd->cmd);
53 cmd->ext = __be16_to_cpu(cmd->ext);
54 cmd->csize = __be16_to_cpu(cmd->csize);
55 cmd->cpad = __be16_to_cpu(cmd->cpad);
56 cmd->size = __be32_to_cpu(cmd->size);
59 #define NETFS_TRANS_SINGLE_DST (1<<0)
62 NETFS_READDIR = 1, /* Read directory for given inode number */
63 NETFS_READ_PAGE, /* Read data page from the server */
64 NETFS_WRITE_PAGE, /* Write data page to the server */
65 NETFS_CREATE, /* Create directory entry */
66 NETFS_REMOVE, /* Remove directory entry */
68 NETFS_LOOKUP, /* Lookup single object */
69 NETFS_LINK, /* Create a link */
70 NETFS_TRANS, /* Transaction */
71 NETFS_OPEN, /* Open intent */
72 NETFS_INODE_INFO, /* Metadata cache coherency synchronization message */
74 NETFS_PAGE_CACHE, /* Page cache invalidation message */
75 NETFS_READ_PAGES, /* Read multiple contiguous pages in one go */
76 NETFS_RENAME, /* Rename object */
77 NETFS_CAPABILITIES, /* Capabilities of the client, for example supported crypto */
78 NETFS_LOCK, /* Distributed lock message */
80 NETFS_XATTR_SET, /* Set extended attribute */
81 NETFS_XATTR_GET, /* Get extended attribute */
86 POHMELFS_FLAGS_ADD = 0, /* Network state control message for ADD */
87 POHMELFS_FLAGS_DEL, /* Network state control message for DEL */
88 POHMELFS_FLAGS_SHOW, /* Network state control message for SHOW */
89 POHMELFS_FLAGS_CRYPTO, /* Crypto data control message */
93 * Always wanted to copy it from socket headers into public one,
94 * since they are __KERNEL__ protected there.
96 #define _K_SS_MAXSIZE 128
100 unsigned short sa_family;
101 char addr[_K_SS_MAXSIZE];
105 POHMELFS_CRYPTO_HASH = 0,
106 POHMELFS_CRYPTO_CIPHER,
109 struct pohmelfs_crypto
111 unsigned int idx; /* Config index */
112 unsigned short strlen; /* Size of the attached crypto string including 0-byte
113 * "cbc(aes)" for example */
114 unsigned short type; /* HMAC, cipher, both */
115 unsigned int keysize; /* Key size */
116 unsigned char data[0]; /* Algorithm string, key and IV */
120 * Configuration command used to create table of different remote servers.
124 unsigned int idx; /* Config index */
125 unsigned int type; /* Socket type */
126 unsigned int proto; /* Socket protocol */
127 unsigned int addrlen; /* Size of the address */
128 unsigned short unused; /* Align structure by 4 bytes */
129 struct saddr addr; /* Remote server address */
133 * Ack for userspace about requested command.
135 struct pohmelfs_cn_ack
141 struct pohmelfs_ctl ctl;
145 * Inode info structure used to sync with server.
146 * Check what stat() returns.
148 struct netfs_inode_info
154 unsigned int blocksize;
155 unsigned int padding;
163 static inline void netfs_convert_inode_info(struct netfs_inode_info *info)
165 info->mode = __cpu_to_be32(info->mode);
166 info->nlink = __cpu_to_be32(info->nlink);
167 info->uid = __cpu_to_be32(info->uid);
168 info->gid = __cpu_to_be32(info->gid);
169 info->blocksize = __cpu_to_be32(info->blocksize);
170 info->blocks = __cpu_to_be64(info->blocks);
171 info->rdev = __cpu_to_be64(info->rdev);
172 info->size = __cpu_to_be64(info->size);
173 info->version = __cpu_to_be64(info->version);
174 info->ino = __cpu_to_be64(info->ino);
178 * Cache state machine.
181 NETFS_COMMAND_PENDING = 0, /* Command is being executed */
182 NETFS_INODE_REMOTE_SYNCED, /* Inode was synced to server */
183 NETFS_INODE_REMOTE_DIR_SYNCED, /* Inode (directory) was synced from the server */
184 NETFS_INODE_OWNED, /* Inode is owned by given host */
185 NETFS_INODE_NEED_FLUSH, /* Inode has to be flushed to the server */
189 * POHMELFS capabilities: information about supported
190 * crypto operations (hash/cipher, modes, key sizes and so on),
191 * root informaion (used/available size, number of objects, permissions)
193 enum pohmelfs_capabilities {
194 POHMELFS_CRYPTO_CAPABILITIES = 0,
195 POHMELFS_ROOT_CAPABILITIES,
198 /* Read-only mount */
199 #define POHMELFS_FLAGS_RO (1<<0)
200 /* Extended attributes support on/off */
201 #define POHMELFS_FLAGS_XATTR (1<<1)
203 struct netfs_root_capabilities
210 static inline void netfs_convert_root_capabilities(struct netfs_root_capabilities *cap)
212 cap->nr_files = __cpu_to_be64(cap->nr_files);
213 cap->used = __cpu_to_be64(cap->used);
214 cap->avail = __cpu_to_be64(cap->avail);
215 cap->flags = __cpu_to_be64(cap->flags);
218 struct netfs_crypto_capabilities
220 unsigned short hash_strlen; /* Hash string length, like "hmac(sha1) including 0 byte "*/
221 unsigned short cipher_strlen; /* Cipher string length with the same format */
222 unsigned int cipher_keysize; /* Cipher key size */
225 static inline void netfs_convert_crypto_capabilities(struct netfs_crypto_capabilities *cap)
227 cap->hash_strlen = __cpu_to_be16(cap->hash_strlen);
228 cap->cipher_strlen = __cpu_to_be16(cap->cipher_strlen);
229 cap->cipher_keysize = __cpu_to_be32(cap->cipher_keysize);
232 enum pohmelfs_lock_type {
233 POHMELFS_LOCK_GRAB = (1<<15),
235 POHMELFS_READ_LOCK = 0,
247 static inline void netfs_convert_lock(struct netfs_lock *lock)
249 lock->start = __cpu_to_be64(lock->start);
250 lock->ino = __cpu_to_be64(lock->ino);
251 lock->size = __cpu_to_be32(lock->size);
252 lock->type = __cpu_to_be32(lock->type);
257 #include <linux/kernel.h>
258 #include <linux/completion.h>
259 #include <linux/rbtree.h>
260 #include <linux/net.h>
261 #include <linux/poll.h>
264 * Private POHMELFS cache of objects in directory.
268 struct rb_node hash_node;
270 struct list_head sync_create_entry;
282 * POHMELFS inode. Main object.
284 struct pohmelfs_inode
286 struct list_head inode_entry; /* Entry in superblock list.
287 * Objects which are not bound to dentry require to be dropped
290 struct rb_root hash_root; /* The same, but indexed by name hash and len */
291 struct mutex offset_lock; /* Protect both above trees */
293 struct list_head sync_create_list; /* List of created but not yet synced to the server children */
295 unsigned int drop_count;
297 int lock_type; /* How this inode is locked: read or write */
299 int error; /* Transaction error for given inode */
301 long state; /* State machine above */
303 u64 ino; /* Inode number */
304 u64 total_len; /* Total length of all children names, used to create offsets */
306 struct inode vfs_inode;
310 typedef int (* netfs_trans_complete_t)(struct page **pages, unsigned int page_num,
311 void *private, int err);
319 * Transaction header and attached contiguous data live here.
324 * Pages attached to transaction.
329 * List and protecting lock for transaction destination
333 struct list_head dst_list;
336 * Number of users for given transaction.
337 * For example each network state attached to transaction
338 * via dst_list increases it.
343 * Number of pages attached to given transaction.
344 * Some slots in above page array can be NULL, since
345 * for example page can be under writeback already,
346 * so we skip it in this transaction.
348 unsigned int page_num;
351 * Transaction flags: single dst or broadcast and so on.
356 * Size of the data, which can be placed into
357 * iovec.iov_base area.
359 unsigned int total_size;
362 * Number of pages to be sent to remote server.
363 * Usually equal to above page_num, but in case of partial
364 * writeback it can accumulate only pages already completed
365 * previous writeback.
367 unsigned int attached_pages;
370 * Attached number of bytes in all above pages.
372 unsigned int attached_size;
375 * Unique transacton generation number.
376 * Used as identity in the network state tree of transactions.
381 * Transaction completion status.
386 * Superblock this transaction belongs to
388 struct pohmelfs_sb *psb;
391 * Crypto engine, which processed this transaction.
392 * Can be not NULL only if crypto engine holds encrypted pages.
394 struct pohmelfs_crypto_engine *eng;
399 /* Completion callback, invoked just before transaction is destroyed */
400 netfs_trans_complete_t complete;
403 static inline int netfs_trans_cur_len(struct netfs_trans *t)
405 return (signed)(t->total_size - t->iovec.iov_len);
408 static inline void *netfs_trans_current(struct netfs_trans *t)
410 return t->iovec.iov_base + t->iovec.iov_len;
413 struct netfs_trans *netfs_trans_alloc(struct pohmelfs_sb *psb, unsigned int size,
414 unsigned int flags, unsigned int nr);
415 void netfs_trans_free(struct netfs_trans *t);
416 int netfs_trans_finish(struct netfs_trans *t, struct pohmelfs_sb *psb);
417 int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb);
419 static inline void netfs_trans_reset(struct netfs_trans *t)
424 struct netfs_trans_dst
426 struct list_head trans_entry;
427 struct rb_node state_entry;
429 unsigned long send_time;
432 * Times this transaction was resent to its old or new,
433 * depending on flags, destinations. When it reaches maximum
434 * allowed number, specified in superblock->trans_retries,
435 * transaction will be freed with ETIMEDOUT error.
437 unsigned int retries;
439 struct netfs_trans *trans;
440 struct netfs_state *state;
443 struct netfs_trans_dst *netfs_trans_search(struct netfs_state *st, unsigned int gen);
444 void netfs_trans_drop_dst(struct netfs_trans_dst *dst);
445 void netfs_trans_drop_dst_nostate(struct netfs_trans_dst *dst);
446 void netfs_trans_drop_trans(struct netfs_trans *t, struct netfs_state *st);
447 void netfs_trans_drop_last(struct netfs_trans *t, struct netfs_state *st);
448 int netfs_trans_resend(struct netfs_trans *t, struct pohmelfs_sb *psb);
449 int netfs_trans_remove_nolock(struct netfs_trans_dst *dst, struct netfs_state *st);
451 int netfs_trans_init(void);
452 void netfs_trans_exit(void);
454 struct pohmelfs_crypto_engine
456 u64 iv; /* Crypto IV for current operation */
457 unsigned long timeout; /* Crypto waiting timeout */
458 unsigned int size; /* Size of crypto scratchpad */
459 void *data; /* Temporal crypto scratchpad */
461 * Crypto operations performed on objects.
463 struct crypto_hash *hash;
464 struct crypto_ablkcipher *cipher;
466 struct pohmelfs_crypto_thread *thread; /* Crypto thread which hosts this engine */
469 unsigned int page_num;
472 struct pohmelfs_crypto_thread
474 struct list_head thread_entry;
476 struct task_struct *thread;
477 struct pohmelfs_sb *psb;
479 struct pohmelfs_crypto_engine eng;
481 struct netfs_trans *trans;
483 wait_queue_head_t wait;
490 void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th);
493 * Network state, attached to one server.
497 struct mutex __state_lock; /* Can not allow to use the same socket simultaneously */
498 struct mutex __state_send_lock;
499 struct netfs_cmd cmd; /* Cached command */
500 struct netfs_inode_info info; /* Cached inode info */
502 void *data; /* Cached some data */
503 unsigned int size; /* Size of that data */
505 struct pohmelfs_sb *psb; /* Superblock */
507 struct task_struct *thread; /* Async receiving thread */
509 /* Waiting/polling machinery */
511 wait_queue_head_t *whead;
512 wait_queue_head_t thread_wait;
514 struct mutex trans_lock;
515 struct rb_root trans_root;
517 struct pohmelfs_ctl ctl; /* Remote peer */
519 struct socket *socket; /* Socket object */
520 struct socket *read_socket; /* Cached pointer to socket object.
521 * Used to determine if between lock drops socket was changed.
522 * Never used to read data or any kind of access.
525 * Crypto engines to process incoming data.
527 struct pohmelfs_crypto_engine eng;
532 int netfs_state_init(struct netfs_state *st);
533 void netfs_state_exit(struct netfs_state *st);
535 static inline void netfs_state_lock_send(struct netfs_state *st)
537 mutex_lock(&st->__state_send_lock);
540 static inline int netfs_state_trylock_send(struct netfs_state *st)
542 return mutex_trylock(&st->__state_send_lock);
545 static inline void netfs_state_unlock_send(struct netfs_state *st)
547 BUG_ON(!mutex_is_locked(&st->__state_send_lock));
549 mutex_unlock(&st->__state_send_lock);
552 static inline void netfs_state_lock(struct netfs_state *st)
554 mutex_lock(&st->__state_lock);
557 static inline void netfs_state_unlock(struct netfs_state *st)
559 BUG_ON(!mutex_is_locked(&st->__state_lock));
561 mutex_unlock(&st->__state_lock);
564 static inline unsigned int netfs_state_poll(struct netfs_state *st)
566 unsigned int revents = POLLHUP | POLLERR;
568 netfs_state_lock(st);
570 revents = st->socket->ops->poll(NULL, st->socket, NULL);
571 netfs_state_unlock(st);
576 struct pohmelfs_config;
580 struct rb_root mcache_root;
581 struct mutex mcache_lock;
582 atomic_long_t mcache_gen;
583 unsigned long mcache_timeout;
587 unsigned int trans_retries;
591 unsigned int crypto_attached_size;
592 unsigned int crypto_align_size;
594 unsigned int crypto_fail_unsupported;
596 unsigned int crypto_thread_num;
597 struct list_head crypto_active_list, crypto_ready_list;
598 struct mutex crypto_thread_lock;
600 unsigned int trans_max_pages;
601 unsigned long trans_data_size;
602 unsigned long trans_timeout;
604 unsigned long drop_scan_timeout;
605 unsigned long trans_scan_timeout;
607 unsigned long wait_on_page_timeout;
609 struct list_head flush_list;
610 struct list_head drop_list;
615 * Remote nodes POHMELFS connected to.
617 struct list_head state_list;
618 struct mutex state_lock;
621 * Currently active state to request data from.
623 struct pohmelfs_config *active_state;
626 wait_queue_head_t wait;
629 * Timed checks: stale transactions, inodes to be freed and so on.
631 struct delayed_work dwork;
632 struct delayed_work drop_dwork;
634 struct super_block *sb;
646 * Algorithm string lengths.
648 unsigned int hash_strlen;
649 unsigned int cipher_strlen;
650 unsigned int hash_keysize;
651 unsigned int cipher_keysize;
654 * Controls whether to perfrom crypto processing or not.
659 * POHMELFS statistics.
663 atomic_long_t total_inodes;
666 * Xattr support, read-only and so on.
671 * Temporary storage to detect changes in the wait queue.
676 static inline void netfs_trans_update(struct netfs_cmd *cmd,
677 struct netfs_trans *t, unsigned int size)
679 unsigned int sz = ALIGN(size, t->psb->crypto_align_size);
681 t->iovec.iov_len += sizeof(struct netfs_cmd) + sz;
682 cmd->cpad = __cpu_to_be16(sz - size);
685 static inline struct pohmelfs_sb *POHMELFS_SB(struct super_block *sb)
687 return sb->s_fs_info;
690 static inline struct pohmelfs_inode *POHMELFS_I(struct inode *inode)
692 return container_of(inode, struct pohmelfs_inode, vfs_inode);
695 static inline u64 pohmelfs_new_ino(struct pohmelfs_sb *psb)
699 spin_lock(&psb->ino_lock);
701 spin_unlock(&psb->ino_lock);
706 static inline void pohmelfs_put_inode(struct pohmelfs_inode *pi)
708 struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
710 spin_lock(&psb->ino_lock);
711 list_move_tail(&pi->inode_entry, &psb->drop_list);
713 spin_unlock(&psb->ino_lock);
716 struct pohmelfs_config
718 struct list_head config_entry;
720 struct netfs_state state;
723 struct pohmelfs_config_group
726 * Entry in the global config group list.
728 struct list_head group_entry;
731 * Index of the current group.
735 * Number of config_list entries in this group entry.
737 unsigned int num_entry;
745 * Algorithm string lengths.
747 unsigned int hash_strlen;
748 unsigned int cipher_strlen;
753 unsigned int hash_keysize;
754 unsigned int cipher_keysize;
759 * List of config entries (network state info) for given idx.
761 struct list_head config_list;
764 int __init pohmelfs_config_init(void);
765 void pohmelfs_config_exit(void);
766 int pohmelfs_copy_config(struct pohmelfs_sb *psb);
767 int pohmelfs_copy_crypto(struct pohmelfs_sb *psb);
768 int pohmelfs_config_check(struct pohmelfs_config *config, int idx);
769 int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf);
771 extern const struct file_operations pohmelfs_dir_fops;
772 extern const struct inode_operations pohmelfs_dir_inode_ops;
774 int pohmelfs_state_init(struct pohmelfs_sb *psb);
775 void pohmelfs_state_exit(struct pohmelfs_sb *psb);
776 void pohmelfs_state_flush_transactions(struct netfs_state *st);
778 void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info);
780 void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
781 void pohmelfs_free_names(struct pohmelfs_inode *parent);
782 struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash);
784 void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi);
786 struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb,
787 struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode);
789 int pohmelfs_write_create_inode(struct pohmelfs_inode *pi);
791 int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans);
792 int pohmelfs_remove_child(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
794 struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb,
795 struct pohmelfs_inode *parent, struct qstr *str,
796 struct netfs_inode_info *info, int link);
798 int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr);
799 int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr);
801 int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags,
802 netfs_trans_complete_t complete, void *priv, u64 start);
803 int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon,
804 unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start);
806 void pohmelfs_check_states(struct pohmelfs_sb *psb);
807 void pohmelfs_switch_active(struct pohmelfs_sb *psb);
809 int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len);
810 int pohmelfs_path_length(struct pohmelfs_inode *pi);
812 struct pohmelfs_crypto_completion
814 struct completion complete;
818 int pohmelfs_trans_crypt(struct netfs_trans *t, struct pohmelfs_sb *psb);
819 void pohmelfs_crypto_exit(struct pohmelfs_sb *psb);
820 int pohmelfs_crypto_init(struct pohmelfs_sb *psb);
822 int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb);
823 void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e);
825 int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 iv,
826 void *data, struct page *page, unsigned int size);
827 int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e,
828 struct page *page, unsigned int size, u64 iv);
830 static inline u64 pohmelfs_gen_iv(struct netfs_trans *t)
835 iv |= ((unsigned long)t) & 0xffffffff;
840 int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
841 int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
842 int pohmelfs_data_lock_response(struct netfs_state *st);
844 static inline int pohmelfs_need_lock(struct pohmelfs_inode *pi, int type)
846 if (test_bit(NETFS_INODE_OWNED, &pi->state)) {
847 if (type == pi->lock_type)
849 if ((type == POHMELFS_READ_LOCK) && (pi->lock_type == POHMELFS_WRITE_LOCK))
853 if (!test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
859 int __init pohmelfs_mcache_init(void);
860 void pohmelfs_mcache_exit(void);
862 //#define CONFIG_POHMELFS_DEBUG
864 #ifdef CONFIG_POHMELFS_DEBUG
865 #define dprintka(f, a...) printk(f, ##a)
866 #define dprintk(f, a...) printk("%d: " f, task_pid_vnr(current), ##a)
868 #define dprintka(f, a...) do {} while (0)
869 #define dprintk(f, a...) do {} while (0)
872 static inline void netfs_trans_get(struct netfs_trans *t)
874 atomic_inc(&t->refcnt);
877 static inline void netfs_trans_put(struct netfs_trans *t)
879 if (atomic_dec_and_test(&t->refcnt)) {
880 dprintk("%s: t: %p, gen: %u, err: %d.\n",
881 __func__, t, t->gen, t->result);
883 t->complete(t->pages, t->page_num,
884 t->private, t->result);
889 struct pohmelfs_mcache
891 struct rb_node mcache_entry;
892 struct completion complete;
903 struct netfs_inode_info info;
906 struct pohmelfs_mcache *pohmelfs_mcache_alloc(struct pohmelfs_sb *psb, u64 start,
907 unsigned int size, void *data);
908 void pohmelfs_mcache_free(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
909 struct pohmelfs_mcache *pohmelfs_mcache_search(struct pohmelfs_sb *psb, u64 gen);
910 void pohmelfs_mcache_remove_locked(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
912 static inline void pohmelfs_mcache_get(struct pohmelfs_mcache *m)
914 atomic_inc(&m->refcnt);
917 static inline void pohmelfs_mcache_put(struct pohmelfs_sb *psb,
918 struct pohmelfs_mcache *m)
920 if (atomic_dec_and_test(&m->refcnt))
921 pohmelfs_mcache_free(psb, m);
924 int pohmelfs_ftrans_init(void);
925 void pohmelfs_ftrans_exit(void);
926 void pohmelfs_ftrans_update(u64 id);
927 int pohmelfs_ftrans_check(u64 id);
928 void pohmelfs_ftrans_clean(u64 id);
930 #endif /* __KERNEL__*/
932 #endif /* __NETFS_H */