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

/*
 * Virtio 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 <glib.h>
#include <glib/gprintf.h>
#include <sys/types.h>
#include <sys/time.h>
#include <utime.h>
#include <sys/uio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>

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

void v9fs_string_free(V9fsString *str)
{
    g_free(str->data);
    str->data = NULL;
    str->size = 0;
}

void v9fs_string_null(V9fsString *str)
{
    v9fs_string_free(str);
}

void GCC_FMT_ATTR(2, 3)
v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
{
    va_list ap;

    v9fs_string_free(str);

    va_start(ap, fmt);
    str->size = g_vasprintf(&str->data, fmt, ap);
    va_end(ap);
}

void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
{
    v9fs_string_free(lhs);
    v9fs_string_sprintf(lhs, "%s", rhs->data);
}


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

    va_start(ap, fmt);
    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_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_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_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_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) {
            va_end(ap);
            return copied;
        }
        offset += copied;
    }
    va_end(ap);

    return offset - old_offset;
}

ssize_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
                     int bswap, const char *fmt, ...)
{
    int i;
    va_list ap;
    ssize_t copied = 0;
    size_t old_offset = offset;

    va_start(ap, fmt);
    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_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_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_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_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) {
            va_end(ap);
            return copied;
        }
        offset += copied;
    }
    va_end(ap);

    return offset - old_offset;
}
Commit	Line	Data
10925bf0 MK	1	/*
	2	* Virtio 9p backend
	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
	14	#include <glib.h>
	15	#include <glib/gprintf.h>
	16	#include <sys/types.h>
10925bf0 MK	17	#include <sys/time.h>
	18	#include <utime.h>
	19	#include <sys/uio.h>
	20	#include <string.h>
	21	#include <stdint.h>
ddca7f86	22	#include <errno.h>
10925bf0	23
1de7afc9	24	#include "qemu/compiler.h"
10925bf0	25	#include "virtio-9p-marshal.h"
1de7afc9	26	#include "qemu/bswap.h"
10925bf0	27
10925bf0 MK	28	void v9fs_string_free(V9fsString *str)
	29	{
	30	g_free(str->data);
	31	str->data = NULL;
	32	str->size = 0;
	33	}
	34
	35	void v9fs_string_null(V9fsString *str)
	36	{
	37	v9fs_string_free(str);
	38	}
	39
	40	void GCC_FMT_ATTR(2, 3)
	41	v9fs_string_sprintf(V9fsString str, const char fmt, ...)
	42	{
	43	va_list ap;
	44
	45	v9fs_string_free(str);
	46
	47	va_start(ap, fmt);
	48	str->size = g_vasprintf(&str->data, fmt, ap);
	49	va_end(ap);
	50	}
	51
	52	void v9fs_string_copy(V9fsString lhs, V9fsString rhs)
	53	{
	54	v9fs_string_free(lhs);
	55	v9fs_string_sprintf(lhs, "%s", rhs->data);
	56	}
	57
	58
ddca7f86 MK	59	static ssize_t v9fs_packunpack(void addr, struct iovec sg, int sg_count,
ddca7f86 MK	60	size_t offset, size_t size, int pack)
10925bf0 MK	61	{
	62	int i = 0;
	63	size_t copied = 0;
ddca7f86 MK	64	size_t req_size = size;
ddca7f86 MK	65
10925bf0 MK	66
	67	for (i = 0; size && i < sg_count; i++) {
	68	size_t len;
	69	if (offset >= sg[i].iov_len) {
	70	/* skip this sg */
	71	offset -= sg[i].iov_len;
	72	continue;
	73	} else {
	74	len = MIN(sg[i].iov_len - offset, size);
	75	if (pack) {
	76	memcpy(sg[i].iov_base + offset, addr, len);
	77	} else {
	78	memcpy(addr, sg[i].iov_base + offset, len);
	79	}
	80	size -= len;
	81	copied += len;
	82	addr += len;
	83	if (size) {
	84	offset = 0;
	85	continue;
	86	}
	87	}
	88	}
ddca7f86 MK	89	if (copied < req_size) {
	90	/*
	91	* We copied less that requested size. error out
	92	*/
	93	return -ENOBUFS;
	94	}
10925bf0 MK	95	return copied;
	96	}
	97
ddca7f86 MK	98	static ssize_t v9fs_unpack(void dst, struct iovec out_sg, int out_num,
ddca7f86 MK	99	size_t offset, size_t size)
10925bf0 MK	100	{
	101	return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
	102	}
	103
ddca7f86 MK	104	ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	105	const void *src, size_t size)
10925bf0 MK	106	{
	107	return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
	108	}
	109
ddca7f86 MK	110	ssize_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
ddca7f86 MK	111	int bswap, const char *fmt, ...)
10925bf0 MK	112	{
	113	int i;
	114	va_list ap;
ddca7f86	115	ssize_t copied = 0;
10925bf0 MK	116	size_t old_offset = offset;
	117
	118	va_start(ap, fmt);
	119	for (i = 0; fmt[i]; i++) {
	120	switch (fmt[i]) {
	121	case 'b': {
	122	uint8_t valp = va_arg(ap, uint8_t );
ddca7f86	123	copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
10925bf0 MK	124	break;
	125	}
	126	case 'w': {
	127	uint16_t val, *valp;
	128	valp = va_arg(ap, uint16_t *);
ddca7f86	129	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	130	if (bswap) {
	131	*valp = le16_to_cpu(val);
	132	} else {
	133	*valp = val;
	134	}
	135	break;
	136	}
	137	case 'd': {
	138	uint32_t val, *valp;
	139	valp = va_arg(ap, uint32_t *);
ddca7f86	140	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	141	if (bswap) {
	142	*valp = le32_to_cpu(val);
	143	} else {
	144	*valp = val;
	145	}
	146	break;
	147	}
	148	case 'q': {
	149	uint64_t val, *valp;
	150	valp = va_arg(ap, uint64_t *);
ddca7f86	151	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	152	if (bswap) {
	153	*valp = le64_to_cpu(val);
	154	} else {
	155	*valp = val;
	156	}
	157	break;
	158	}
	159	case 's': {
	160	V9fsString str = va_arg(ap, V9fsString );
ddca7f86 MK	161	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
	162	"w", &str->size);
	163	if (copied > 0) {
	164	offset += copied;
	165	str->data = g_malloc(str->size + 1);
	166	copied = v9fs_unpack(str->data, out_sg, out_num, offset,
	167	str->size);
	168	if (copied > 0) {
	169	str->data[str->size] = 0;
	170	} else {
	171	v9fs_string_free(str);
	172	}
	173	}
10925bf0 MK	174	break;
	175	}
	176	case 'Q': {
	177	V9fsQID qidp = va_arg(ap, V9fsQID );
ddca7f86 MK	178	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, "bdq",
ddca7f86 MK	179	&qidp->type, &qidp->version, &qidp->path);
10925bf0 MK	180	break;
	181	}
	182	case 'S': {
	183	V9fsStat statp = va_arg(ap, V9fsStat );
ddca7f86	184	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
10925bf0	185	"wwdQdddqsssssddd",
ddca7f86 MK	186	&statp->size, &statp->type, &statp->dev,
	187	&statp->qid, &statp->mode, &statp->atime,
	188	&statp->mtime, &statp->length,
	189	&statp->name, &statp->uid, &statp->gid,
	190	&statp->muid, &statp->extension,
	191	&statp->n_uid, &statp->n_gid,
	192	&statp->n_muid);
10925bf0 MK	193	break;
	194	}
	195	case 'I': {
	196	V9fsIattr iattr = va_arg(ap, V9fsIattr );
ddca7f86 MK	197	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
	198	"ddddqqqqq",
	199	&iattr->valid, &iattr->mode,
	200	&iattr->uid, &iattr->gid, &iattr->size,
	201	&iattr->atime_sec, &iattr->atime_nsec,
	202	&iattr->mtime_sec, &iattr->mtime_nsec);
10925bf0 MK	203	break;
	204	}
	205	default:
	206	break;
	207	}
ddca7f86 MK	208	if (copied < 0) {
	209	va_end(ap);
	210	return copied;
	211	}
	212	offset += copied;
10925bf0	213	}
10925bf0 MK	214	va_end(ap);
	215
	216	return offset - old_offset;
	217	}
	218
ddca7f86 MK	219	ssize_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	220	int bswap, const char *fmt, ...)
10925bf0 MK	221	{
	222	int i;
	223	va_list ap;
ddca7f86	224	ssize_t copied = 0;
10925bf0 MK	225	size_t old_offset = offset;
	226
	227	va_start(ap, fmt);
	228	for (i = 0; fmt[i]; i++) {
	229	switch (fmt[i]) {
	230	case 'b': {
	231	uint8_t val = va_arg(ap, int);
ddca7f86	232	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	233	break;
	234	}
	235	case 'w': {
	236	uint16_t val;
	237	if (bswap) {
	238	cpu_to_le16w(&val, va_arg(ap, int));
	239	} else {
	240	val = va_arg(ap, int);
	241	}
ddca7f86	242	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	243	break;
	244	}
	245	case 'd': {
	246	uint32_t val;
	247	if (bswap) {
	248	cpu_to_le32w(&val, va_arg(ap, uint32_t));
	249	} else {
	250	val = va_arg(ap, uint32_t);
	251	}
ddca7f86	252	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	253	break;
	254	}
	255	case 'q': {
	256	uint64_t val;
	257	if (bswap) {
	258	cpu_to_le64w(&val, va_arg(ap, uint64_t));
	259	} else {
	260	val = va_arg(ap, uint64_t);
	261	}
ddca7f86	262	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	263	break;
	264	}
	265	case 's': {
	266	V9fsString str = va_arg(ap, V9fsString );
ddca7f86 MK	267	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
	268	"w", str->size);
	269	if (copied > 0) {
	270	offset += copied;
	271	copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
	272	}
10925bf0 MK	273	break;
	274	}
	275	case 'Q': {
	276	V9fsQID qidp = va_arg(ap, V9fsQID );
ddca7f86 MK	277	copied = v9fs_marshal(in_sg, in_num, offset, bswap, "bdq",
ddca7f86 MK	278	qidp->type, qidp->version, qidp->path);
10925bf0 MK	279	break;
	280	}
	281	case 'S': {
	282	V9fsStat statp = va_arg(ap, V9fsStat );
ddca7f86 MK	283	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
	284	"wwdQdddqsssssddd",
	285	statp->size, statp->type, statp->dev,
	286	&statp->qid, statp->mode, statp->atime,
	287	statp->mtime, statp->length, &statp->name,
	288	&statp->uid, &statp->gid, &statp->muid,
	289	&statp->extension, statp->n_uid,
	290	statp->n_gid, statp->n_muid);
10925bf0 MK	291	break;
	292	}
	293	case 'A': {
	294	V9fsStatDotl statp = va_arg(ap, V9fsStatDotl );
ddca7f86	295	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
10925bf0 MK	296	"qQdddqqqqqqqqqqqqqqq",
	297	statp->st_result_mask,
	298	&statp->qid, statp->st_mode,
	299	statp->st_uid, statp->st_gid,
	300	statp->st_nlink, statp->st_rdev,
	301	statp->st_size, statp->st_blksize,
	302	statp->st_blocks, statp->st_atime_sec,
	303	statp->st_atime_nsec, statp->st_mtime_sec,
	304	statp->st_mtime_nsec, statp->st_ctime_sec,
	305	statp->st_ctime_nsec, statp->st_btime_sec,
	306	statp->st_btime_nsec, statp->st_gen,
	307	statp->st_data_version);
	308	break;
	309	}
	310	default:
	311	break;
	312	}
ddca7f86 MK	313	if (copied < 0) {
	314	va_end(ap);
	315	return copied;
	316	}
	317	offset += copied;
10925bf0 MK	318	}
	319	va_end(ap);
	320
	321	return offset - old_offset;
	322	}