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

/*
 * 9p backend
 *
 * Copyright IBM, Corp. 2010
 *
 * Authors:
 *  Anthony Liguori   <[email protected]>
 *
 * 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 <sys/uio.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:
            break;
        }
        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;
            if (bswap) {
                cpu_to_le16w(&val, va_arg(ap, int));
            } else {
                val =  va_arg(ap, int);
            }
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 'd': {
            uint32_t val;
            if (bswap) {
                cpu_to_le32w(&val, va_arg(ap, uint32_t));
            } else {
                val =  va_arg(ap, uint32_t);
            }
            copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
            break;
        }
        case 'q': {
            uint64_t val;
            if (bswap) {
                cpu_to_le64w(&val, va_arg(ap, uint64_t));
            } else {
                val =  va_arg(ap, uint64_t);
            }
            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:
            break;
        }
        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 <[email protected]>
	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 MK	16	#include <utime.h>
10925bf0 MK	17	#include <sys/uio.h>
10925bf0	18
2209bd05	19	#include "9p-iov-marshal.h"
1de7afc9	20	#include "qemu/bswap.h"
10925bf0	21
ddca7f86 MK	22	static ssize_t v9fs_packunpack(void addr, struct iovec sg, int sg_count,
ddca7f86 MK	23	size_t offset, size_t size, int pack)
10925bf0 MK	24	{
	25	int i = 0;
	26	size_t copied = 0;
ddca7f86 MK	27	size_t req_size = size;
ddca7f86 MK	28
10925bf0 MK	29
	30	for (i = 0; size && i < sg_count; i++) {
	31	size_t len;
	32	if (offset >= sg[i].iov_len) {
	33	/* skip this sg */
	34	offset -= sg[i].iov_len;
	35	continue;
	36	} else {
	37	len = MIN(sg[i].iov_len - offset, size);
	38	if (pack) {
	39	memcpy(sg[i].iov_base + offset, addr, len);
	40	} else {
	41	memcpy(addr, sg[i].iov_base + offset, len);
	42	}
	43	size -= len;
	44	copied += len;
	45	addr += len;
	46	if (size) {
	47	offset = 0;
	48	continue;
	49	}
	50	}
	51	}
ddca7f86 MK	52	if (copied < req_size) {
	53	/*
	54	* We copied less that requested size. error out
	55	*/
	56	return -ENOBUFS;
	57	}
10925bf0 MK	58	return copied;
	59	}
	60
ddca7f86 MK	61	static ssize_t v9fs_unpack(void dst, struct iovec out_sg, int out_num,
ddca7f86 MK	62	size_t offset, size_t size)
10925bf0 MK	63	{
	64	return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
	65	}
	66
ddca7f86 MK	67	ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	68	const void *src, size_t size)
10925bf0 MK	69	{
	70	return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
	71	}
	72
0e2082d9 WL	73	ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset,
0e2082d9 WL	74	int bswap, const char *fmt, va_list ap)
10925bf0 MK	75	{
10925bf0 MK	76	int i;
ddca7f86	77	ssize_t copied = 0;
10925bf0 MK	78	size_t old_offset = offset;
10925bf0 MK	79
10925bf0 MK	80	for (i = 0; fmt[i]; i++) {
	81	switch (fmt[i]) {
	82	case 'b': {
	83	uint8_t valp = va_arg(ap, uint8_t );
ddca7f86	84	copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
10925bf0 MK	85	break;
	86	}
	87	case 'w': {
	88	uint16_t val, *valp;
	89	valp = va_arg(ap, uint16_t *);
ddca7f86	90	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	91	if (bswap) {
	92	*valp = le16_to_cpu(val);
	93	} else {
	94	*valp = val;
	95	}
	96	break;
	97	}
	98	case 'd': {
	99	uint32_t val, *valp;
	100	valp = va_arg(ap, uint32_t *);
ddca7f86	101	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	102	if (bswap) {
	103	*valp = le32_to_cpu(val);
	104	} else {
	105	*valp = val;
	106	}
	107	break;
	108	}
	109	case 'q': {
	110	uint64_t val, *valp;
	111	valp = va_arg(ap, uint64_t *);
ddca7f86	112	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	113	if (bswap) {
	114	*valp = le64_to_cpu(val);
	115	} else {
	116	*valp = val;
	117	}
	118	break;
	119	}
	120	case 's': {
	121	V9fsString str = va_arg(ap, V9fsString );
2209bd05 WL	122	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
2209bd05 WL	123	"w", &str->size);
ddca7f86 MK	124	if (copied > 0) {
	125	offset += copied;
	126	str->data = g_malloc(str->size + 1);
	127	copied = v9fs_unpack(str->data, out_sg, out_num, offset,
	128	str->size);
	129	if (copied > 0) {
	130	str->data[str->size] = 0;
	131	} else {
	132	v9fs_string_free(str);
	133	}
	134	}
10925bf0 MK	135	break;
	136	}
	137	case 'Q': {
	138	V9fsQID qidp = va_arg(ap, V9fsQID );
2209bd05 WL	139	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	140	"bdq", &qidp->type, &qidp->version,
	141	&qidp->path);
10925bf0 MK	142	break;
	143	}
	144	case 'S': {
	145	V9fsStat statp = va_arg(ap, V9fsStat );
2209bd05 WL	146	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	147	"wwdQdddqsssssddd",
	148	&statp->size, &statp->type,
	149	&statp->dev, &statp->qid,
	150	&statp->mode, &statp->atime,
	151	&statp->mtime, &statp->length,
	152	&statp->name, &statp->uid,
	153	&statp->gid, &statp->muid,
	154	&statp->extension,
	155	&statp->n_uid, &statp->n_gid,
	156	&statp->n_muid);
10925bf0 MK	157	break;
	158	}
	159	case 'I': {
	160	V9fsIattr iattr = va_arg(ap, V9fsIattr );
2209bd05 WL	161	copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
	162	"ddddqqqqq",
	163	&iattr->valid, &iattr->mode,
	164	&iattr->uid, &iattr->gid,
	165	&iattr->size, &iattr->atime_sec,
	166	&iattr->atime_nsec,
	167	&iattr->mtime_sec,
	168	&iattr->mtime_nsec);
10925bf0 MK	169	break;
	170	}
	171	default:
	172	break;
	173	}
ddca7f86	174	if (copied < 0) {
ddca7f86 MK	175	return copied;
	176	}
	177	offset += copied;
10925bf0	178	}
10925bf0 MK	179
	180	return offset - old_offset;
	181	}
	182
0e2082d9 WL	183	ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
0e2082d9 WL	184	int bswap, const char *fmt, ...)
10925bf0	185	{
0e2082d9	186	ssize_t ret;
10925bf0	187	va_list ap;
0e2082d9 WL	188
	189	va_start(ap, fmt);
	190	ret = v9fs_iov_vunmarshal(out_sg, out_num, offset, bswap, fmt, ap);
	191	va_end(ap);
	192
	193	return ret;
	194	}
	195
	196	ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset,
	197	int bswap, const char *fmt, va_list ap)
	198	{
	199	int i;
ddca7f86	200	ssize_t copied = 0;
10925bf0 MK	201	size_t old_offset = offset;
10925bf0 MK	202
10925bf0 MK	203	for (i = 0; fmt[i]; i++) {
	204	switch (fmt[i]) {
	205	case 'b': {
	206	uint8_t val = va_arg(ap, int);
ddca7f86	207	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	208	break;
	209	}
	210	case 'w': {
	211	uint16_t val;
	212	if (bswap) {
	213	cpu_to_le16w(&val, va_arg(ap, int));
	214	} else {
	215	val = va_arg(ap, int);
	216	}
ddca7f86	217	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	218	break;
	219	}
	220	case 'd': {
	221	uint32_t val;
	222	if (bswap) {
	223	cpu_to_le32w(&val, va_arg(ap, uint32_t));
	224	} else {
	225	val = va_arg(ap, uint32_t);
	226	}
ddca7f86	227	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	228	break;
	229	}
	230	case 'q': {
	231	uint64_t val;
	232	if (bswap) {
	233	cpu_to_le64w(&val, va_arg(ap, uint64_t));
	234	} else {
	235	val = va_arg(ap, uint64_t);
	236	}
ddca7f86	237	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	238	break;
	239	}
	240	case 's': {
	241	V9fsString str = va_arg(ap, V9fsString );
2209bd05 WL	242	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
2209bd05 WL	243	"w", str->size);
ddca7f86 MK	244	if (copied > 0) {
	245	offset += copied;
	246	copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
	247	}
10925bf0 MK	248	break;
	249	}
	250	case 'Q': {
	251	V9fsQID qidp = va_arg(ap, V9fsQID );
2209bd05 WL	252	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, "bdq",
	253	qidp->type, qidp->version,
	254	qidp->path);
10925bf0 MK	255	break;
	256	}
	257	case 'S': {
	258	V9fsStat statp = va_arg(ap, V9fsStat );
2209bd05 WL	259	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
	260	"wwdQdddqsssssddd",
	261	statp->size, statp->type, statp->dev,
	262	&statp->qid, statp->mode, statp->atime,
	263	statp->mtime, statp->length,
	264	&statp->name,
	265	&statp->uid, &statp->gid, &statp->muid,
	266	&statp->extension, statp->n_uid,
	267	statp->n_gid, statp->n_muid);
10925bf0 MK	268	break;
	269	}
	270	case 'A': {
	271	V9fsStatDotl statp = va_arg(ap, V9fsStatDotl );
2209bd05 WL	272	copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
	273	"qQdddqqqqqqqqqqqqqqq",
	274	statp->st_result_mask,
	275	&statp->qid, statp->st_mode,
	276	statp->st_uid, statp->st_gid,
	277	statp->st_nlink, statp->st_rdev,
	278	statp->st_size, statp->st_blksize,
	279	statp->st_blocks, statp->st_atime_sec,
	280	statp->st_atime_nsec,
	281	statp->st_mtime_sec,
	282	statp->st_mtime_nsec,
	283	statp->st_ctime_sec,
	284	statp->st_ctime_nsec,
	285	statp->st_btime_sec,
	286	statp->st_btime_nsec, statp->st_gen,
	287	statp->st_data_version);
10925bf0 MK	288	break;
	289	}
	290	default:
	291	break;
	292	}
ddca7f86	293	if (copied < 0) {
ddca7f86 MK	294	return copied;
	295	}
	296	offset += copied;
10925bf0	297	}
10925bf0 MK	298
	299	return offset - old_offset;
	300	}
0e2082d9 WL	301
	302	ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
	303	int bswap, const char *fmt, ...)
	304	{
	305	ssize_t ret;
	306	va_list ap;
	307
	308	va_start(ap, fmt);
	309	ret = v9fs_iov_vmarshal(in_sg, in_num, offset, bswap, fmt, ap);
	310	va_end(ap);
	311
	312	return ret;
	313	}