[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 <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 "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_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_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) {
            va_end(ap);
            return copied;
        }
        offset += copied;
    }
    va_end(ap);

    return offset - old_offset;
}

ssize_t v9fs_iov_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_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) {
            va_end(ap);
            return copied;
        }
        offset += copied;
    }
    va_end(ap);

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