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

/*
 * Virtio 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 <glib.h>
#include <glib/gprintf.h>
#include <sys/types.h>
#include <dirent.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 <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
	14	#include <glib.h>
	15	#include <glib/gprintf.h>
	16	#include <sys/types.h>
	17	#include <dirent.h>
	18	#include <sys/time.h>
	19	#include <utime.h>
	20	#include <sys/uio.h>
	21	#include <string.h>
	22	#include <stdint.h>
ddca7f86	23	#include <errno.h>
10925bf0	24
1de7afc9	25	#include "qemu/compiler.h"
10925bf0	26	#include "virtio-9p-marshal.h"
1de7afc9	27	#include "qemu/bswap.h"
10925bf0	28
10925bf0 MK	29	void v9fs_string_free(V9fsString *str)
	30	{
	31	g_free(str->data);
	32	str->data = NULL;
	33	str->size = 0;
	34	}
	35
	36	void v9fs_string_null(V9fsString *str)
	37	{
	38	v9fs_string_free(str);
	39	}
	40
	41	void GCC_FMT_ATTR(2, 3)
	42	v9fs_string_sprintf(V9fsString str, const char fmt, ...)
	43	{
	44	va_list ap;
	45
	46	v9fs_string_free(str);
	47
	48	va_start(ap, fmt);
	49	str->size = g_vasprintf(&str->data, fmt, ap);
	50	va_end(ap);
	51	}
	52
	53	void v9fs_string_copy(V9fsString lhs, V9fsString rhs)
	54	{
	55	v9fs_string_free(lhs);
	56	v9fs_string_sprintf(lhs, "%s", rhs->data);
	57	}
	58
	59
ddca7f86 MK	60	static ssize_t v9fs_packunpack(void addr, struct iovec sg, int sg_count,
ddca7f86 MK	61	size_t offset, size_t size, int pack)
10925bf0 MK	62	{
	63	int i = 0;
	64	size_t copied = 0;
ddca7f86 MK	65	size_t req_size = size;
ddca7f86 MK	66
10925bf0 MK	67
	68	for (i = 0; size && i < sg_count; i++) {
	69	size_t len;
	70	if (offset >= sg[i].iov_len) {
	71	/* skip this sg */
	72	offset -= sg[i].iov_len;
	73	continue;
	74	} else {
	75	len = MIN(sg[i].iov_len - offset, size);
	76	if (pack) {
	77	memcpy(sg[i].iov_base + offset, addr, len);
	78	} else {
	79	memcpy(addr, sg[i].iov_base + offset, len);
	80	}
	81	size -= len;
	82	copied += len;
	83	addr += len;
	84	if (size) {
	85	offset = 0;
	86	continue;
	87	}
	88	}
	89	}
ddca7f86 MK	90	if (copied < req_size) {
	91	/*
	92	* We copied less that requested size. error out
	93	*/
	94	return -ENOBUFS;
	95	}
10925bf0 MK	96	return copied;
	97	}
	98
ddca7f86 MK	99	static ssize_t v9fs_unpack(void dst, struct iovec out_sg, int out_num,
ddca7f86 MK	100	size_t offset, size_t size)
10925bf0 MK	101	{
	102	return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
	103	}
	104
ddca7f86 MK	105	ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	106	const void *src, size_t size)
10925bf0 MK	107	{
	108	return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
	109	}
	110
ddca7f86 MK	111	ssize_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
ddca7f86 MK	112	int bswap, const char *fmt, ...)
10925bf0 MK	113	{
	114	int i;
	115	va_list ap;
ddca7f86	116	ssize_t copied = 0;
10925bf0 MK	117	size_t old_offset = offset;
	118
	119	va_start(ap, fmt);
	120	for (i = 0; fmt[i]; i++) {
	121	switch (fmt[i]) {
	122	case 'b': {
	123	uint8_t valp = va_arg(ap, uint8_t );
ddca7f86	124	copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
10925bf0 MK	125	break;
	126	}
	127	case 'w': {
	128	uint16_t val, *valp;
	129	valp = va_arg(ap, uint16_t *);
ddca7f86	130	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	131	if (bswap) {
	132	*valp = le16_to_cpu(val);
	133	} else {
	134	*valp = val;
	135	}
	136	break;
	137	}
	138	case 'd': {
	139	uint32_t val, *valp;
	140	valp = va_arg(ap, uint32_t *);
ddca7f86	141	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	142	if (bswap) {
	143	*valp = le32_to_cpu(val);
	144	} else {
	145	*valp = val;
	146	}
	147	break;
	148	}
	149	case 'q': {
	150	uint64_t val, *valp;
	151	valp = va_arg(ap, uint64_t *);
ddca7f86	152	copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
10925bf0 MK	153	if (bswap) {
	154	*valp = le64_to_cpu(val);
	155	} else {
	156	*valp = val;
	157	}
	158	break;
	159	}
	160	case 's': {
	161	V9fsString str = va_arg(ap, V9fsString );
ddca7f86 MK	162	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
	163	"w", &str->size);
	164	if (copied > 0) {
	165	offset += copied;
	166	str->data = g_malloc(str->size + 1);
	167	copied = v9fs_unpack(str->data, out_sg, out_num, offset,
	168	str->size);
	169	if (copied > 0) {
	170	str->data[str->size] = 0;
	171	} else {
	172	v9fs_string_free(str);
	173	}
	174	}
10925bf0 MK	175	break;
	176	}
	177	case 'Q': {
	178	V9fsQID qidp = va_arg(ap, V9fsQID );
ddca7f86 MK	179	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap, "bdq",
ddca7f86 MK	180	&qidp->type, &qidp->version, &qidp->path);
10925bf0 MK	181	break;
	182	}
	183	case 'S': {
	184	V9fsStat statp = va_arg(ap, V9fsStat );
ddca7f86	185	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
10925bf0	186	"wwdQdddqsssssddd",
ddca7f86 MK	187	&statp->size, &statp->type, &statp->dev,
	188	&statp->qid, &statp->mode, &statp->atime,
	189	&statp->mtime, &statp->length,
	190	&statp->name, &statp->uid, &statp->gid,
	191	&statp->muid, &statp->extension,
	192	&statp->n_uid, &statp->n_gid,
	193	&statp->n_muid);
10925bf0 MK	194	break;
	195	}
	196	case 'I': {
	197	V9fsIattr iattr = va_arg(ap, V9fsIattr );
ddca7f86 MK	198	copied = v9fs_unmarshal(out_sg, out_num, offset, bswap,
	199	"ddddqqqqq",
	200	&iattr->valid, &iattr->mode,
	201	&iattr->uid, &iattr->gid, &iattr->size,
	202	&iattr->atime_sec, &iattr->atime_nsec,
	203	&iattr->mtime_sec, &iattr->mtime_nsec);
10925bf0 MK	204	break;
	205	}
	206	default:
	207	break;
	208	}
ddca7f86 MK	209	if (copied < 0) {
	210	va_end(ap);
	211	return copied;
	212	}
	213	offset += copied;
10925bf0	214	}
10925bf0 MK	215	va_end(ap);
	216
	217	return offset - old_offset;
	218	}
	219
ddca7f86 MK	220	ssize_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
ddca7f86 MK	221	int bswap, const char *fmt, ...)
10925bf0 MK	222	{
	223	int i;
	224	va_list ap;
ddca7f86	225	ssize_t copied = 0;
10925bf0 MK	226	size_t old_offset = offset;
	227
	228	va_start(ap, fmt);
	229	for (i = 0; fmt[i]; i++) {
	230	switch (fmt[i]) {
	231	case 'b': {
	232	uint8_t val = va_arg(ap, int);
ddca7f86	233	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	234	break;
	235	}
	236	case 'w': {
	237	uint16_t val;
	238	if (bswap) {
	239	cpu_to_le16w(&val, va_arg(ap, int));
	240	} else {
	241	val = va_arg(ap, int);
	242	}
ddca7f86	243	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	244	break;
	245	}
	246	case 'd': {
	247	uint32_t val;
	248	if (bswap) {
	249	cpu_to_le32w(&val, va_arg(ap, uint32_t));
	250	} else {
	251	val = va_arg(ap, uint32_t);
	252	}
ddca7f86	253	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	254	break;
	255	}
	256	case 'q': {
	257	uint64_t val;
	258	if (bswap) {
	259	cpu_to_le64w(&val, va_arg(ap, uint64_t));
	260	} else {
	261	val = va_arg(ap, uint64_t);
	262	}
ddca7f86	263	copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
10925bf0 MK	264	break;
	265	}
	266	case 's': {
	267	V9fsString str = va_arg(ap, V9fsString );
ddca7f86 MK	268	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
	269	"w", str->size);
	270	if (copied > 0) {
	271	offset += copied;
	272	copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
	273	}
10925bf0 MK	274	break;
	275	}
	276	case 'Q': {
	277	V9fsQID qidp = va_arg(ap, V9fsQID );
ddca7f86 MK	278	copied = v9fs_marshal(in_sg, in_num, offset, bswap, "bdq",
ddca7f86 MK	279	qidp->type, qidp->version, qidp->path);
10925bf0 MK	280	break;
	281	}
	282	case 'S': {
	283	V9fsStat statp = va_arg(ap, V9fsStat );
ddca7f86 MK	284	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
	285	"wwdQdddqsssssddd",
	286	statp->size, statp->type, statp->dev,
	287	&statp->qid, statp->mode, statp->atime,
	288	statp->mtime, statp->length, &statp->name,
	289	&statp->uid, &statp->gid, &statp->muid,
	290	&statp->extension, statp->n_uid,
	291	statp->n_gid, statp->n_muid);
10925bf0 MK	292	break;
	293	}
	294	case 'A': {
	295	V9fsStatDotl statp = va_arg(ap, V9fsStatDotl );
ddca7f86	296	copied = v9fs_marshal(in_sg, in_num, offset, bswap,
10925bf0 MK	297	"qQdddqqqqqqqqqqqqqqq",
	298	statp->st_result_mask,
	299	&statp->qid, statp->st_mode,
	300	statp->st_uid, statp->st_gid,
	301	statp->st_nlink, statp->st_rdev,
	302	statp->st_size, statp->st_blksize,
	303	statp->st_blocks, statp->st_atime_sec,
	304	statp->st_atime_nsec, statp->st_mtime_sec,
	305	statp->st_mtime_nsec, statp->st_ctime_sec,
	306	statp->st_ctime_nsec, statp->st_btime_sec,
	307	statp->st_btime_nsec, statp->st_gen,
	308	statp->st_data_version);
	309	break;
	310	}
	311	default:
	312	break;
	313	}
ddca7f86 MK	314	if (copied < 0) {
	315	va_end(ap);
	316	return copied;
	317	}
	318	offset += copied;
10925bf0 MK	319	}
	320	va_end(ap);
	321
	322	return offset - old_offset;
	323	}