[mirror_ubuntu-artful-kernel.git] / fs / ceph / locks.c

#include <linux/ceph/ceph_debug.h>

#include <linux/file.h>
#include <linux/namei.h>
#include <linux/random.h>

#include "super.h"
#include "mds_client.h"
#include <linux/ceph/pagelist.h>

static u64 lock_secret;

static inline u64 secure_addr(void *addr)
{
	u64 v = lock_secret ^ (u64)(unsigned long)addr;
	/*
	 * Set the most significant bit, so that MDS knows the 'owner'
	 * is sufficient to identify the owner of lock. (old code uses
	 * both 'owner' and 'pid')
	 */
	v |= (1ULL << 63);
	return v;
}

void __init ceph_flock_init(void)
{
	get_random_bytes(&lock_secret, sizeof(lock_secret));
}

/**
 * Implement fcntl and flock locking functions.
 */
static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
			     int cmd, u8 wait, struct file_lock *fl)
{
	struct inode *inode = file_inode(file);
	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
	struct ceph_mds_request *req;
	int err;
	u64 length = 0;
	u64 owner;

	req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
	req->r_inode = inode;
	ihold(inode);
	req->r_num_caps = 1;

	/* mds requires start and length rather than start and end */
	if (LLONG_MAX == fl->fl_end)
		length = 0;
	else
		length = fl->fl_end - fl->fl_start + 1;

	if (lock_type == CEPH_LOCK_FCNTL)
		owner = secure_addr(fl->fl_owner);
	else
		owner = secure_addr(fl->fl_file);

	dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
	     "start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type,
	     (int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length,
	     wait, fl->fl_type);

	req->r_args.filelock_change.rule = lock_type;
	req->r_args.filelock_change.type = cmd;
	req->r_args.filelock_change.owner = cpu_to_le64(owner);
	req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
	req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
	req->r_args.filelock_change.length = cpu_to_le64(length);
	req->r_args.filelock_change.wait = wait;

	err = ceph_mdsc_do_request(mdsc, inode, req);

	if (operation == CEPH_MDS_OP_GETFILELOCK) {
		fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
		if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
			fl->fl_type = F_RDLCK;
		else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
			fl->fl_type = F_WRLCK;
		else
			fl->fl_type = F_UNLCK;

		fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
		length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
						 le64_to_cpu(req->r_reply_info.filelock_reply->length);
		if (length >= 1)
			fl->fl_end = length -1;
		else
			fl->fl_end = 0;

	}
	ceph_mdsc_put_request(req);
	dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
	     "length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
	     (int)operation, (u64)fl->fl_pid, fl->fl_start,
	     length, wait, fl->fl_type, err);
	return err;
}

/**
 * Attempt to set an fcntl lock.
 * For now, this just goes away to the server. Later it may be more awesome.
 */
int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
{
	u8 lock_cmd;
	int err;
	u8 wait = 0;
	u16 op = CEPH_MDS_OP_SETFILELOCK;

	if (!(fl->fl_flags & FL_POSIX))
		return -ENOLCK;
	/* No mandatory locks */
	if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
		return -ENOLCK;

	dout("ceph_lock, fl_owner: %p", fl->fl_owner);

	/* set wait bit as appropriate, then make command as Ceph expects it*/
	if (IS_GETLK(cmd))
		op = CEPH_MDS_OP_GETFILELOCK;
	else if (IS_SETLKW(cmd))
		wait = 1;

	if (F_RDLCK == fl->fl_type)
		lock_cmd = CEPH_LOCK_SHARED;
	else if (F_WRLCK == fl->fl_type)
		lock_cmd = CEPH_LOCK_EXCL;
	else
		lock_cmd = CEPH_LOCK_UNLOCK;

	err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
	if (!err) {
		if (op != CEPH_MDS_OP_GETFILELOCK) {
			dout("mds locked, locking locally");
			err = posix_lock_file(file, fl, NULL);
			if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
				/* undo! This should only happen if
				 * the kernel detects local
				 * deadlock. */
				ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
						  CEPH_LOCK_UNLOCK, 0, fl);
				dout("got %d on posix_lock_file, undid lock",
				     err);
			}
		}

	} else if (err == -ERESTARTSYS) {
		dout("undoing lock\n");
		ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
				  CEPH_LOCK_UNLOCK, 0, fl);
	}
	return err;
}

int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
{
	u8 lock_cmd;
	int err;
	u8 wait = 0;

	if (!(fl->fl_flags & FL_FLOCK))
		return -ENOLCK;
	/* No mandatory locks */
	if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
		return -ENOLCK;

	dout("ceph_flock, fl_file: %p", fl->fl_file);

	if (IS_SETLKW(cmd))
		wait = 1;

	if (F_RDLCK == fl->fl_type)
		lock_cmd = CEPH_LOCK_SHARED;
	else if (F_WRLCK == fl->fl_type)
		lock_cmd = CEPH_LOCK_EXCL;
	else
		lock_cmd = CEPH_LOCK_UNLOCK;

	err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
				file, lock_cmd, wait, fl);
	if (!err) {
		err = flock_lock_file_wait(file, fl);
		if (err) {
			ceph_lock_message(CEPH_LOCK_FLOCK,
					  CEPH_MDS_OP_SETFILELOCK,
					  file, CEPH_LOCK_UNLOCK, 0, fl);
			dout("got %d on flock_lock_file_wait, undid lock", err);
		}
	} else if (err == -ERESTARTSYS) {
		dout("undoing lock\n");
		ceph_lock_message(CEPH_LOCK_FLOCK,
				  CEPH_MDS_OP_SETFILELOCK,
				  file, CEPH_LOCK_UNLOCK, 0, fl);
	}
	return err;
}

/**
 * Must be called with lock_flocks() already held. Fills in the passed
 * counter variables, so you can prepare pagelist metadata before calling
 * ceph_encode_locks.
 */
void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
{
	struct file_lock *lock;

	*fcntl_count = 0;
	*flock_count = 0;

	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
		if (lock->fl_flags & FL_POSIX)
			++(*fcntl_count);
		else if (lock->fl_flags & FL_FLOCK)
			++(*flock_count);
	}
	dout("counted %d flock locks and %d fcntl locks",
	     *flock_count, *fcntl_count);
}

/**
 * Encode the flock and fcntl locks for the given inode into the ceph_filelock
 * array. Must be called with inode->i_lock already held.
 * If we encounter more of a specific lock type than expected, return -ENOSPC.
 */
int ceph_encode_locks_to_buffer(struct inode *inode,
				struct ceph_filelock *flocks,
				int num_fcntl_locks, int num_flock_locks)
{
	struct file_lock *lock;
	int err = 0;
	int seen_fcntl = 0;
	int seen_flock = 0;
	int l = 0;

	dout("encoding %d flock and %d fcntl locks", num_flock_locks,
	     num_fcntl_locks);

	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
		if (lock->fl_flags & FL_POSIX) {
			++seen_fcntl;
			if (seen_fcntl > num_fcntl_locks) {
				err = -ENOSPC;
				goto fail;
			}
			err = lock_to_ceph_filelock(lock, &flocks[l]);
			if (err)
				goto fail;
			++l;
		}
	}
	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
		if (lock->fl_flags & FL_FLOCK) {
			++seen_flock;
			if (seen_flock > num_flock_locks) {
				err = -ENOSPC;
				goto fail;
			}
			err = lock_to_ceph_filelock(lock, &flocks[l]);
			if (err)
				goto fail;
			++l;
		}
	}
fail:
	return err;
}

/**
 * Copy the encoded flock and fcntl locks into the pagelist.
 * Format is: #fcntl locks, sequential fcntl locks, #flock locks,
 * sequential flock locks.
 * Returns zero on success.
 */
int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
			   struct ceph_pagelist *pagelist,
			   int num_fcntl_locks, int num_flock_locks)
{
	int err = 0;
	__le32 nlocks;

	nlocks = cpu_to_le32(num_fcntl_locks);
	err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
	if (err)
		goto out_fail;

	err = ceph_pagelist_append(pagelist, flocks,
				   num_fcntl_locks * sizeof(*flocks));
	if (err)
		goto out_fail;

	nlocks = cpu_to_le32(num_flock_locks);
	err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
	if (err)
		goto out_fail;

	err = ceph_pagelist_append(pagelist,
				   &flocks[num_fcntl_locks],
				   num_flock_locks * sizeof(*flocks));
out_fail:
	return err;
}

/*
 * Given a pointer to a lock, convert it to a ceph filelock
 */
int lock_to_ceph_filelock(struct file_lock *lock,
			  struct ceph_filelock *cephlock)
{
	int err = 0;
	cephlock->start = cpu_to_le64(lock->fl_start);
	cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
	cephlock->client = cpu_to_le64(0);
	cephlock->pid = cpu_to_le64((u64)lock->fl_pid);
	if (lock->fl_flags & FL_POSIX)
		cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
	else
		cephlock->owner = cpu_to_le64(secure_addr(lock->fl_file));

	switch (lock->fl_type) {
	case F_RDLCK:
		cephlock->type = CEPH_LOCK_SHARED;
		break;
	case F_WRLCK:
		cephlock->type = CEPH_LOCK_EXCL;
		break;
	case F_UNLCK:
		cephlock->type = CEPH_LOCK_UNLOCK;
		break;
	default:
		dout("Have unknown lock type %d", lock->fl_type);
		err = -EINVAL;
	}

	return err;
}
Commit	Line	Data
3d14c5d2	1	#include <linux/ceph/ceph_debug.h>
40819f6f GF	2
	3	#include <linux/file.h>
	4	#include <linux/namei.h>
eb13e832	5	#include <linux/random.h>
40819f6f GF	6
	7	#include "super.h"
	8	#include "mds_client.h"
3d14c5d2	9	#include <linux/ceph/pagelist.h>
40819f6f	10
eb13e832 YZ	11	static u64 lock_secret;
	12
	13	static inline u64 secure_addr(void *addr)
	14	{
	15	u64 v = lock_secret ^ (u64)(unsigned long)addr;
	16	/*
	17	* Set the most significant bit, so that MDS knows the 'owner'
	18	* is sufficient to identify the owner of lock. (old code uses
	19	* both 'owner' and 'pid')
	20	*/
	21	v \|= (1ULL << 63);
	22	return v;
	23	}
	24
	25	void __init ceph_flock_init(void)
	26	{
	27	get_random_bytes(&lock_secret, sizeof(lock_secret));
	28	}
	29
40819f6f GF	30	/**
	31	* Implement fcntl and flock locking functions.
	32	*/
	33	static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
637ae8d5	34	int cmd, u8 wait, struct file_lock *fl)
40819f6f	35	{
496ad9aa	36	struct inode *inode = file_inode(file);
eb13e832	37	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
40819f6f GF	38	struct ceph_mds_request *req;
40819f6f GF	39	int err;
637ae8d5	40	u64 length = 0;
eb13e832	41	u64 owner;
40819f6f GF	42
	43	req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
	44	if (IS_ERR(req))
	45	return PTR_ERR(req);
70b666c3 SW	46	req->r_inode = inode;
70b666c3 SW	47	ihold(inode);
3bd58143	48	req->r_num_caps = 1;
40819f6f	49
637ae8d5 HS	50	/* mds requires start and length rather than start and end */
	51	if (LLONG_MAX == fl->fl_end)
	52	length = 0;
	53	else
	54	length = fl->fl_end - fl->fl_start + 1;
	55
eb13e832 YZ	56	if (lock_type == CEPH_LOCK_FCNTL)
	57	owner = secure_addr(fl->fl_owner);
	58	else
	59	owner = secure_addr(fl->fl_file);
	60
	61	dout("ceph_lock_message: rule: %d, op: %d, owner: %llx, pid: %llu, "
	62	"start: %llu, length: %llu, wait: %d, type: %d", (int)lock_type,
	63	(int)operation, owner, (u64)fl->fl_pid, fl->fl_start, length,
	64	wait, fl->fl_type);
637ae8d5	65
40819f6f GF	66	req->r_args.filelock_change.rule = lock_type;
40819f6f GF	67	req->r_args.filelock_change.type = cmd;
eb13e832	68	req->r_args.filelock_change.owner = cpu_to_le64(owner);
637ae8d5	69	req->r_args.filelock_change.pid = cpu_to_le64((u64)fl->fl_pid);
637ae8d5	70	req->r_args.filelock_change.start = cpu_to_le64(fl->fl_start);
40819f6f GF	71	req->r_args.filelock_change.length = cpu_to_le64(length);
	72	req->r_args.filelock_change.wait = wait;
	73
	74	err = ceph_mdsc_do_request(mdsc, inode, req);
a5b10629	75
eb13e832	76	if (operation == CEPH_MDS_OP_GETFILELOCK) {
a5b10629 HS	77	fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
	78	if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
	79	fl->fl_type = F_RDLCK;
	80	else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
	81	fl->fl_type = F_WRLCK;
	82	else
	83	fl->fl_type = F_UNLCK;
	84
	85	fl->fl_start = le64_to_cpu(req->r_reply_info.filelock_reply->start);
	86	length = le64_to_cpu(req->r_reply_info.filelock_reply->start) +
	87	le64_to_cpu(req->r_reply_info.filelock_reply->length);
	88	if (length >= 1)
	89	fl->fl_end = length -1;
	90	else
	91	fl->fl_end = 0;
	92
	93	}
40819f6f GF	94	ceph_mdsc_put_request(req);
40819f6f GF	95	dout("ceph_lock_message: rule: %d, op: %d, pid: %llu, start: %llu, "
0c1f91f2	96	"length: %llu, wait: %d, type: %d, err code %d", (int)lock_type,
637ae8d5 HS	97	(int)operation, (u64)fl->fl_pid, fl->fl_start,
637ae8d5 HS	98	length, wait, fl->fl_type, err);
40819f6f GF	99	return err;
	100	}
	101
	102	/**
	103	* Attempt to set an fcntl lock.
	104	* For now, this just goes away to the server. Later it may be more awesome.
	105	*/
	106	int ceph_lock(struct file file, int cmd, struct file_lock fl)
	107	{
40819f6f GF	108	u8 lock_cmd;
	109	int err;
	110	u8 wait = 0;
	111	u16 op = CEPH_MDS_OP_SETFILELOCK;
	112
eb70c0ce YZ	113	if (!(fl->fl_flags & FL_POSIX))
	114	return -ENOLCK;
	115	/* No mandatory locks */
	116	if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
	117	return -ENOLCK;
	118
eb13e832	119	dout("ceph_lock, fl_owner: %p", fl->fl_owner);
40819f6f GF	120
40819f6f GF	121	/* set wait bit as appropriate, then make command as Ceph expects it*/
0e8e95d6	122	if (IS_GETLK(cmd))
40819f6f	123	op = CEPH_MDS_OP_GETFILELOCK;
0e8e95d6 YZ	124	else if (IS_SETLKW(cmd))
0e8e95d6 YZ	125	wait = 1;
40819f6f GF	126
	127	if (F_RDLCK == fl->fl_type)
	128	lock_cmd = CEPH_LOCK_SHARED;
	129	else if (F_WRLCK == fl->fl_type)
	130	lock_cmd = CEPH_LOCK_EXCL;
	131	else
	132	lock_cmd = CEPH_LOCK_UNLOCK;
	133
637ae8d5	134	err = ceph_lock_message(CEPH_LOCK_FCNTL, op, file, lock_cmd, wait, fl);
40819f6f	135	if (!err) {
eb13e832	136	if (op != CEPH_MDS_OP_GETFILELOCK) {
a5b10629 HS	137	dout("mds locked, locking locally");
	138	err = posix_lock_file(file, fl, NULL);
	139	if (err && (CEPH_MDS_OP_SETFILELOCK == op)) {
0c1f91f2 SW	140	/* undo! This should only happen if
	141	* the kernel detects local
	142	* deadlock. */
a5b10629 HS	143	ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
a5b10629 HS	144	CEPH_LOCK_UNLOCK, 0, fl);
0c1f91f2 SW	145	dout("got %d on posix_lock_file, undid lock",
0c1f91f2 SW	146	err);
a5b10629	147	}
40819f6f	148	}
a5b10629	149
0c1f91f2 SW	150	} else if (err == -ERESTARTSYS) {
	151	dout("undoing lock\n");
	152	ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
	153	CEPH_LOCK_UNLOCK, 0, fl);
40819f6f GF	154	}
	155	return err;
	156	}
	157
	158	int ceph_flock(struct file file, int cmd, struct file_lock fl)
	159	{
40819f6f GF	160	u8 lock_cmd;
40819f6f GF	161	int err;
0e8e95d6	162	u8 wait = 0;
40819f6f	163
eb70c0ce YZ	164	if (!(fl->fl_flags & FL_FLOCK))
	165	return -ENOLCK;
	166	/* No mandatory locks */
	167	if (__mandatory_lock(file->f_mapping->host) && fl->fl_type != F_UNLCK)
	168	return -ENOLCK;
	169
eb13e832	170	dout("ceph_flock, fl_file: %p", fl->fl_file);
40819f6f	171
0e8e95d6 YZ	172	if (IS_SETLKW(cmd))
	173	wait = 1;
	174
	175	if (F_RDLCK == fl->fl_type)
40819f6f	176	lock_cmd = CEPH_LOCK_SHARED;
0e8e95d6	177	else if (F_WRLCK == fl->fl_type)
40819f6f GF	178	lock_cmd = CEPH_LOCK_EXCL;
	179	else
	180	lock_cmd = CEPH_LOCK_UNLOCK;
40819f6f GF	181
40819f6f GF	182	err = ceph_lock_message(CEPH_LOCK_FLOCK, CEPH_MDS_OP_SETFILELOCK,
637ae8d5	183	file, lock_cmd, wait, fl);
40819f6f GF	184	if (!err) {
	185	err = flock_lock_file_wait(file, fl);
	186	if (err) {
	187	ceph_lock_message(CEPH_LOCK_FLOCK,
	188	CEPH_MDS_OP_SETFILELOCK,
637ae8d5	189	file, CEPH_LOCK_UNLOCK, 0, fl);
40819f6f GF	190	dout("got %d on flock_lock_file_wait, undid lock", err);
40819f6f GF	191	}
0c1f91f2 SW	192	} else if (err == -ERESTARTSYS) {
	193	dout("undoing lock\n");
	194	ceph_lock_message(CEPH_LOCK_FLOCK,
	195	CEPH_MDS_OP_SETFILELOCK,
	196	file, CEPH_LOCK_UNLOCK, 0, fl);
40819f6f GF	197	}
	198	return err;
	199	}
	200
	201	/**
4d1bf79a	202	* Must be called with lock_flocks() already held. Fills in the passed
40819f6f GF	203	* counter variables, so you can prepare pagelist metadata before calling
	204	* ceph_encode_locks.
	205	*/
	206	void ceph_count_locks(struct inode inode, int fcntl_count, int *flock_count)
	207	{
	208	struct file_lock *lock;
	209
	210	*fcntl_count = 0;
	211	*flock_count = 0;
	212
	213	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
	214	if (lock->fl_flags & FL_POSIX)
	215	++(*fcntl_count);
	216	else if (lock->fl_flags & FL_FLOCK)
	217	++(*flock_count);
	218	}
	219	dout("counted %d flock locks and %d fcntl locks",
	220	flock_count, fcntl_count);
	221	}
	222
	223	/**
39be95e9	224	* Encode the flock and fcntl locks for the given inode into the ceph_filelock
1c8c601a	225	* array. Must be called with inode->i_lock already held.
39be95e9	226	* If we encounter more of a specific lock type than expected, return -ENOSPC.
40819f6f	227	*/
39be95e9 JS	228	int ceph_encode_locks_to_buffer(struct inode *inode,
	229	struct ceph_filelock *flocks,
	230	int num_fcntl_locks, int num_flock_locks)
40819f6f GF	231	{
40819f6f GF	232	struct file_lock *lock;
40819f6f	233	int err = 0;
fca4451a GF	234	int seen_fcntl = 0;
fca4451a GF	235	int seen_flock = 0;
39be95e9	236	int l = 0;
40819f6f GF	237
	238	dout("encoding %d flock and %d fcntl locks", num_flock_locks,
	239	num_fcntl_locks);
39be95e9	240
40819f6f GF	241	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
40819f6f GF	242	if (lock->fl_flags & FL_POSIX) {
fca4451a GF	243	++seen_fcntl;
	244	if (seen_fcntl > num_fcntl_locks) {
	245	err = -ENOSPC;
	246	goto fail;
	247	}
39be95e9	248	err = lock_to_ceph_filelock(lock, &flocks[l]);
40819f6f GF	249	if (err)
40819f6f GF	250	goto fail;
39be95e9	251	++l;
40819f6f	252	}
40819f6f	253	}
40819f6f GF	254	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
40819f6f GF	255	if (lock->fl_flags & FL_FLOCK) {
fca4451a GF	256	++seen_flock;
	257	if (seen_flock > num_flock_locks) {
	258	err = -ENOSPC;
	259	goto fail;
	260	}
39be95e9	261	err = lock_to_ceph_filelock(lock, &flocks[l]);
40819f6f GF	262	if (err)
40819f6f GF	263	goto fail;
39be95e9	264	++l;
40819f6f	265	}
40819f6f GF	266	}
	267	fail:
	268	return err;
	269	}
	270
39be95e9 JS	271	/**
	272	* Copy the encoded flock and fcntl locks into the pagelist.
	273	* Format is: #fcntl locks, sequential fcntl locks, #flock locks,
	274	* sequential flock locks.
	275	* Returns zero on success.
	276	*/
	277	int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
	278	struct ceph_pagelist *pagelist,
	279	int num_fcntl_locks, int num_flock_locks)
	280	{
	281	int err = 0;
	282	__le32 nlocks;
	283
	284	nlocks = cpu_to_le32(num_fcntl_locks);
	285	err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
	286	if (err)
	287	goto out_fail;
	288
	289	err = ceph_pagelist_append(pagelist, flocks,
	290	num_fcntl_locks * sizeof(*flocks));
	291	if (err)
	292	goto out_fail;
	293
	294	nlocks = cpu_to_le32(num_flock_locks);
	295	err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
	296	if (err)
	297	goto out_fail;
	298
	299	err = ceph_pagelist_append(pagelist,
	300	&flocks[num_fcntl_locks],
	301	num_flock_locks * sizeof(*flocks));
	302	out_fail:
	303	return err;
	304	}
	305
40819f6f GF	306	/*
	307	* Given a pointer to a lock, convert it to a ceph filelock
	308	*/
	309	int lock_to_ceph_filelock(struct file_lock *lock,
	310	struct ceph_filelock *cephlock)
	311	{
	312	int err = 0;
40819f6f GF	313	cephlock->start = cpu_to_le64(lock->fl_start);
	314	cephlock->length = cpu_to_le64(lock->fl_end - lock->fl_start + 1);
	315	cephlock->client = cpu_to_le64(0);
eb13e832 YZ	316	cephlock->pid = cpu_to_le64((u64)lock->fl_pid);
	317	if (lock->fl_flags & FL_POSIX)
	318	cephlock->owner = cpu_to_le64(secure_addr(lock->fl_owner));
	319	else
	320	cephlock->owner = cpu_to_le64(secure_addr(lock->fl_file));
40819f6f GF	321
	322	switch (lock->fl_type) {
	323	case F_RDLCK:
	324	cephlock->type = CEPH_LOCK_SHARED;
	325	break;
	326	case F_WRLCK:
	327	cephlock->type = CEPH_LOCK_EXCL;
	328	break;
	329	case F_UNLCK:
	330	cephlock->type = CEPH_LOCK_UNLOCK;
	331	break;
	332	default:
	333	dout("Have unknown lock type %d", lock->fl_type);
	334	err = -EINVAL;
	335	}
	336
	337	return err;
	338	}