[mirror_qemu.git] / fsdev / 9p-iov-marshal.c

/*
 * 9p backend
 *
 * Copyright IBM, Corp. 2010
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include <glib/gprintf.h>
#include <utime.h>

#include "9p-iov-marshal.h"
#include "qemu/bswap.h"

static ssize_t v9fs_packunpack(void *addr, struct iovec *sg, int sg_count,
                               size_t offset, size_t size, int pack)
{
    int i = 0;
    size_t copied = 0;
    size_t req_size = size;


    for (i = 0; size && i < sg_count; i++) {
        size_t len;
        if (offset >= sg[i].iov_len) {
            /* skip this sg */
            offset -= sg[i].iov_len;
            continue;
        } else {
            len = MIN(sg[i].iov_len - offset, size);
            if (pack) {
                memcpy(sg[i].iov_base + offset, addr, len);
            } else {
                memcpy(addr, sg[i].iov_base + offset, len);
            }
            size -= len;
            copied += len;
            addr += len;
            if (size) {
                offset = 0;
                continue;
            }
        }
    }
    if (copied < req_size) {
        /*
         * We copied less that requested size. error out
         */
        return -ENOBUFS;
    }
    return copied;
}

static ssize_t v9fs_unpack(void *dst, struct iovec *out_sg, int out_num,
                           size_t offset, size_t size)
{
    return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
}

ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
                  const void *src, size_t size)
{
    return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
}

ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset,
                            int bswap, const char *fmt, va_list ap)
{
    int i;
    ssize_t copied = 0;
    size_t old_offset = offset;

    for (i = 0; fmt[i]; i++) {
        switch (fmt[i]) {
        case 'b': {
            uint8_t *valp = va_arg(ap, uint8_t *);
            copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
            break;
        }
        case 'w': {
            uint16_t val, *valp;
            valp = va_arg(ap, uint16_t *);
            copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
            if (bswap) {
                *valp = le16_to_cpu(val);
            } else {
                *valp = val;
            }
            break;
        }
        case 'd': {
            uint32_t val, *valp;
            valp = va_arg(ap, uint32_t *);
            copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
            if (bswap) {
                *valp = le32_to_cpu(val);
            } else {
                *valp = val;
            }
            break;
        }
        case 'q': {
            uint64_t val, *valp;
            valp = va_arg(ap, uint64_t *);
            copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
            if (bswap) {
                *valp = le64_to_cpu(val);
            } else {
                *valp = val;
            }
            break;
        }
        case 's': {
            V9fsString *str = va_arg(ap, V9fsString *);
            copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
                                        "w", &str->size);
            if (copied > 0) {
                offset += copied;
                str->data = g_malloc(str->size + 1);
                copied = v9fs_unpack(str->data, out_sg, out_num, offset,
                                     str->size);
                if (copied >= 0) {
                    str->data[str->size] = 0;
                } else {
                    v9fs_string_free(str);
                }
            }
            break;
        }
        case 'Q': {
            V9fsQID *qidp = va_arg(ap, V9fsQID *);
            copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
                                        "bdq", &qidp->type, &qidp->version,
                                        &qidp->path);
            break;
        }
        case 'S': {
            V9fsStat *statp = va_arg(ap, V9fsStat *);
            copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
                                        "wwdQdddqsssssddd",
                                        &statp->size, &statp->type,
                                        &statp->dev, &statp->qid,
                                        &statp->mode, &statp->atime,
                                        &statp->mtime, &statp->length,
                                        &statp->name, &statp->uid,
                                        &statp->gid, &statp->muid,
                                        &statp->extension,
                                        &statp->n_uid, &statp->n_gid,
                                        &statp->n_muid);
            break;
        }
        case 'I': {
            V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
            copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
                                        "ddddqqqqq",
                                        &iattr->valid, &iattr->mode,
                                        &iattr->uid, &iattr->gid,
                                        &iattr->size, &iattr->atime_sec,
                                        &iattr->atime_nsec,
                                        &iattr->mtime_sec,
                                        &iattr->mtime_nsec);
            break;
        }
        default:
            g_assert_not_reached();
        }
        if (copied < 0) {
            return copied;
        }
        offset += copied;
    }

    return offset - old_offset;
}

ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
                           int bswap, const char *fmt, ...)
{
    ssize_t ret;
    va_list ap;

    va_start(ap, fmt);
    ret = v9fs_iov_vunmarshal(out_sg, out_num, offset, bswap, fmt, ap);
    va_end(ap);

    return ret;
}

ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset,
                          int bswap, const char *fmt, va_list ap)
{
    int i;
    ssize_t copied = 0;
    size_t old_offset = offset;

    for (i = 0; fmt[i]; i++) {
        switch (fmt[i]) {
        case 'b': {
            uint8_t val = va_arg(ap, int);
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 'w': {
            uint16_t val = va_arg(ap, int);
            if (bswap) {
                val = cpu_to_le16(val);
            }
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 'd': {
            uint32_t val = va_arg(ap, uint32_t);
            if (bswap) {
                val = cpu_to_le32(val);
            }
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 'q': {
            uint64_t val = va_arg(ap, uint64_t);
            if (bswap) {
                val = cpu_to_le64(val);
            }
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 's': {
            V9fsString *str = va_arg(ap, V9fsString *);
            copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
                                      "w", str->size);
            if (copied > 0) {
                offset += copied;
                copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
            }
            break;
        }
        case 'Q': {
            V9fsQID *qidp = va_arg(ap, V9fsQID *);
            copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, "bdq",
                                      qidp->type, qidp->version,
                                      qidp->path);
            break;
        }
        case 'S': {
            V9fsStat *statp = va_arg(ap, V9fsStat *);
            copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
                                      "wwdQdddqsssssddd",
                                      statp->size, statp->type, statp->dev,
                                      &statp->qid, statp->mode, statp->atime,
                                      statp->mtime, statp->length,
                                      &statp->name,
                                      &statp->uid, &statp->gid, &statp->muid,
                                      &statp->extension, statp->n_uid,
                                      statp->n_gid, statp->n_muid);
            break;
        }
        case 'A': {
            V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
            copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
                                      "qQdddqqqqqqqqqqqqqqq",
                                      statp->st_result_mask,
                                      &statp->qid, statp->st_mode,
                                      statp->st_uid, statp->st_gid,
                                      statp->st_nlink, statp->st_rdev,
                                      statp->st_size, statp->st_blksize,
                                      statp->st_blocks, statp->st_atime_sec,
                                      statp->st_atime_nsec,
                                      statp->st_mtime_sec,
                                      statp->st_mtime_nsec,
                                      statp->st_ctime_sec,
                                      statp->st_ctime_nsec,
                                      statp->st_btime_sec,
                                      statp->st_btime_nsec, statp->st_gen,
                                      statp->st_data_version);
            break;
        }
        default:
            g_assert_not_reached();
        }
        if (copied < 0) {
            return copied;
        }
        offset += copied;
    }

    return offset - old_offset;
}

ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
                         int bswap, const char *fmt, ...)
{
    ssize_t ret;
    va_list ap;

    va_start(ap, fmt);
    ret = v9fs_iov_vmarshal(in_sg, in_num, offset, bswap, fmt, ap);
    va_end(ap);

    return ret;
}
Commit	Line	Data
10925bf0	1	/*
2209bd05	2	* 9p backend
10925bf0 MK	3	*
	4	* Copyright IBM, Corp. 2010
	5	*
	6	* Authors:
	7	* Anthony Liguori <aliguori@us.ibm.com>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2. See
	10	* the COPYING file in the top-level directory.
	11	*
	12	*/
	13
fbc04127	14	#include "qemu/osdep.h"
10925bf0	15	#include <glib/gprintf.h>
10925bf0	16	#include <utime.h>
10925bf0	17
2209bd05	18	#include "9p-iov-marshal.h"
1de7afc9	19	#include "qemu/bswap.h"
10925bf0	20
ddca7f86 MK	21	static ssize_t v9fs_packunpack(void addr, struct iovec sg, int sg_count,
ddca7f86 MK	22	size_t offset, size_t size, int pack)
10925bf0 MK	23	{
	24	int i = 0;
	25	size_t copied = 0;
ddca7f86 MK	26	size_t req_size = size;
ddca7f86 MK	27
10925bf0 MK	28
	29	for (i = 0; size && i < sg_count; i++) {
	30	size_t len;
	31	if (offset >= sg[i].iov_len) {
	32	/* skip this sg */
	33	offset -= sg[i].iov_len;
	34	continue;
	35	} else {
	36	len = MIN(sg[i].iov_len - offset, size);
	37	if (pack) {
	38	memcpy(sg[i].iov_base + offset, addr, len);
	39	} else {
	40	memcpy(addr, sg[i].iov_base + offset, len);
	41	}
	42	size -= len;
	43	copied += len;
	44	addr += len;
	45	if (size) {
	46	offset = 0;
	47	continue;
	48	}
	49	}
	50	}
ddca7f86 MK	51	if (copied < req_size) {
	52	/*
	53	* We copied less that requested size. error out
	54	*/
	55	return -ENOBUFS;
	56	}
10925bf0 MK	57	return copied;
	58	}
	59
ddca7f86 MK	60	static ssize_t v9fs_unpack(void dst, struct iovec out_sg, int out_num,
ddca7f86 MK	61	size_t offset, size_t size)
10925bf0 MK	62	{
	63	return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
	64	}
	65
ddca7f86 MK	66	ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	67	const void *src, size_t size)
10925bf0 MK	68	{
	69	return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
	70	}
	71
0e2082d9 WL	72	ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset,
0e2082d9 WL	73	int bswap, const char *fmt, va_list ap)
10925bf0 MK	74	{
10925bf0 MK	75	int i;
ddca7f86	76	ssize_t copied = 0;
10925bf0 MK	77	size_t old_offset = offset;
10925bf0 MK	78
10925bf0 MK	79	for (i = 0; fmt[i]; i++) {
	80	switch (fmt[i]) {
	81	case 'b': {
	82	uint8_t valp = va_arg(ap, uint8_t );
ddca7f86	83	copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
10925bf0 MK	84	break;
	85	}
	86	case 'w': {
	87	uint16_t val, *valp;
	88	valp = va_arg(ap, uint16_t *);
ddca7f86	89	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	90	if (bswap) {
	91	*valp = le16_to_cpu(val);
	92	} else {
	93	*valp = val;
	94	}
	95	break;
	96	}
	97	case 'd': {
	98	uint32_t val, *valp;
	99	valp = va_arg(ap, uint32_t *);
ddca7f86	100	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	101	if (bswap) {
	102	*valp = le32_to_cpu(val);
	103	} else {
	104	*valp = val;
	105	}
	106	break;
	107	}
	108	case 'q': {
	109	uint64_t val, *valp;
	110	valp = va_arg(ap, uint64_t *);
ddca7f86	111	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	112	if (bswap) {
	113	*valp = le64_to_cpu(val);
	114	} else {
	115	*valp = val;
	116	}
	117	break;
	118	}
	119	case 's': {
	120	V9fsString str = va_arg(ap, V9fsString );
2209bd05 WL	121	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
2209bd05 WL	122	"w", &str->size);
ddca7f86 MK	123	if (copied > 0) {
	124	offset += copied;
	125	str->data = g_malloc(str->size + 1);
	126	copied = v9fs_unpack(str->data, out_sg, out_num, offset,
	127	str->size);
ba42ebb8	128	if (copied >= 0) {
ddca7f86 MK	129	str->data[str->size] = 0;
	130	} else {
	131	v9fs_string_free(str);
	132	}
	133	}
10925bf0 MK	134	break;
	135	}
	136	case 'Q': {
	137	V9fsQID qidp = va_arg(ap, V9fsQID );
2209bd05 WL	138	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	139	"bdq", &qidp->type, &qidp->version,
	140	&qidp->path);
10925bf0 MK	141	break;
	142	}
	143	case 'S': {
	144	V9fsStat statp = va_arg(ap, V9fsStat );
2209bd05 WL	145	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	146	"wwdQdddqsssssddd",
	147	&statp->size, &statp->type,
	148	&statp->dev, &statp->qid,
	149	&statp->mode, &statp->atime,
	150	&statp->mtime, &statp->length,
	151	&statp->name, &statp->uid,
	152	&statp->gid, &statp->muid,
	153	&statp->extension,
	154	&statp->n_uid, &statp->n_gid,
	155	&statp->n_muid);
10925bf0 MK	156	break;
	157	}
	158	case 'I': {
	159	V9fsIattr iattr = va_arg(ap, V9fsIattr );
2209bd05 WL	160	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	161	"ddddqqqqq",
	162	&iattr->valid, &iattr->mode,
	163	&iattr->uid, &iattr->gid,
	164	&iattr->size, &iattr->atime_sec,
	165	&iattr->atime_nsec,
	166	&iattr->mtime_sec,
	167	&iattr->mtime_nsec);
10925bf0 MK	168	break;
	169	}
	170	default:
57a0aa6b	171	g_assert_not_reached();
10925bf0	172	}
ddca7f86	173	if (copied < 0) {
ddca7f86 MK	174	return copied;
	175	}
	176	offset += copied;
10925bf0	177	}
10925bf0 MK	178
	179	return offset - old_offset;
	180	}
	181
0e2082d9 WL	182	ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
0e2082d9 WL	183	int bswap, const char *fmt, ...)
10925bf0	184	{
0e2082d9	185	ssize_t ret;
10925bf0	186	va_list ap;
0e2082d9 WL	187
	188	va_start(ap, fmt);
	189	ret = v9fs_iov_vunmarshal(out_sg, out_num, offset, bswap, fmt, ap);
	190	va_end(ap);
	191
	192	return ret;
	193	}
	194
	195	ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset,
	196	int bswap, const char *fmt, va_list ap)
	197	{
	198	int i;
ddca7f86	199	ssize_t copied = 0;
10925bf0 MK	200	size_t old_offset = offset;
10925bf0 MK	201
10925bf0 MK	202	for (i = 0; fmt[i]; i++) {
	203	switch (fmt[i]) {
	204	case 'b': {
	205	uint8_t val = va_arg(ap, int);
ddca7f86	206	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	207	break;
	208	}
	209	case 'w': {
b442642d	210	uint16_t val = va_arg(ap, int);
10925bf0	211	if (bswap) {
b442642d	212	val = cpu_to_le16(val);
10925bf0	213	}
ddca7f86	214	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	215	break;
	216	}
	217	case 'd': {
b442642d	218	uint32_t val = va_arg(ap, uint32_t);
10925bf0	219	if (bswap) {
b442642d	220	val = cpu_to_le32(val);
10925bf0	221	}
ddca7f86	222	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	223	break;
	224	}
	225	case 'q': {
b442642d	226	uint64_t val = va_arg(ap, uint64_t);
10925bf0	227	if (bswap) {
b442642d	228	val = cpu_to_le64(val);
10925bf0	229	}
ddca7f86	230	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	231	break;
	232	}
	233	case 's': {
	234	V9fsString str = va_arg(ap, V9fsString );
2209bd05 WL	235	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
2209bd05 WL	236	"w", str->size);
ddca7f86 MK	237	if (copied > 0) {
	238	offset += copied;
	239	copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
	240	}
10925bf0 MK	241	break;
	242	}
	243	case 'Q': {
	244	V9fsQID qidp = va_arg(ap, V9fsQID );
2209bd05 WL	245	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, "bdq",
	246	qidp->type, qidp->version,
	247	qidp->path);
10925bf0 MK	248	break;
	249	}
	250	case 'S': {
	251	V9fsStat statp = va_arg(ap, V9fsStat );
2209bd05 WL	252	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
	253	"wwdQdddqsssssddd",
	254	statp->size, statp->type, statp->dev,
	255	&statp->qid, statp->mode, statp->atime,
	256	statp->mtime, statp->length,
	257	&statp->name,
	258	&statp->uid, &statp->gid, &statp->muid,
	259	&statp->extension, statp->n_uid,
	260	statp->n_gid, statp->n_muid);
10925bf0 MK	261	break;
	262	}
	263	case 'A': {
	264	V9fsStatDotl statp = va_arg(ap, V9fsStatDotl );
2209bd05 WL	265	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
	266	"qQdddqqqqqqqqqqqqqqq",
	267	statp->st_result_mask,
	268	&statp->qid, statp->st_mode,
	269	statp->st_uid, statp->st_gid,
	270	statp->st_nlink, statp->st_rdev,
	271	statp->st_size, statp->st_blksize,
	272	statp->st_blocks, statp->st_atime_sec,
	273	statp->st_atime_nsec,
	274	statp->st_mtime_sec,
	275	statp->st_mtime_nsec,
	276	statp->st_ctime_sec,
	277	statp->st_ctime_nsec,
	278	statp->st_btime_sec,
	279	statp->st_btime_nsec, statp->st_gen,
	280	statp->st_data_version);
10925bf0 MK	281	break;
	282	}
	283	default:
57a0aa6b	284	g_assert_not_reached();
10925bf0	285	}
ddca7f86	286	if (copied < 0) {
ddca7f86 MK	287	return copied;
	288	}
	289	offset += copied;
10925bf0	290	}
10925bf0 MK	291
	292	return offset - old_offset;
	293	}
0e2082d9 WL	294
	295	ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
	296	int bswap, const char *fmt, ...)
	297	{
	298	ssize_t ret;
	299	va_list ap;
	300
	301	va_start(ap, fmt);
	302	ret = v9fs_iov_vmarshal(in_sg, in_num, offset, bswap, fmt, ap);
	303	va_end(ap);
	304
	305	return ret;
	306	}