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nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist()
Add nvlist_snprintf() to print a nvlist to a buffer. This is basically the snprintf() version of dump_nvlist(). Along with that, add a zfs_dbgmsg_nvlist() to print out an nvlist to dbgmsg. This will aid in debugging. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #17215
This commit is contained in:
Tony Hutter
@@ -3681,6 +3681,240 @@ nvs_xdr(nvstream_t *nvs, nvlist_t *nvl, char *buf, size_t *buflen)
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return (err);
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}
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#define NVP(buf, size, len, buf_end, elem, type, vtype, ptype, format) { \
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vtype value; \
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int rc; \
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\
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(void) nvpair_value_##type(elem, &value); \
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rc = snprintf(buf, size, "%*s%s: " format "\n", indent, "", \
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nvpair_name(elem), (ptype)value); \
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if (rc < 0) \
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return (rc); \
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size = MAX((int)size - rc, 0); \
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buf = size == 0 ? NULL : buf_end - size; \
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len += rc; \
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}
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#define NVPA(buf, size, len, buf_end, elem, type, vtype, ptype, format) \
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{ \
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uint_t i, count; \
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vtype *value; \
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int rc; \
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\
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(void) nvpair_value_##type(elem, &value, &count); \
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for (i = 0; i < count; i++) { \
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rc = snprintf(buf, size, "%*s%s[%d]: " format "\n", indent, \
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"", nvpair_name(elem), i, (ptype)value[i]); \
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if (rc < 0) \
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return (rc); \
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size = MAX((int)size - rc, 0); \
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buf = size == 0 ? NULL : buf_end - size; \
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len += rc; \
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} \
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}
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/*
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* snprintf() version of dump_nvlist()
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*
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* Works just like snprintf(), but with an nvlist and indent count as args.
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*
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* Output is similar to nvlist_print() but handles arrays slightly differently.
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*
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* Return value matches C99 snprintf() return value conventions.
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*/
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int
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nvlist_snprintf(char *buf, size_t size, nvlist_t *list, int indent)
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{
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nvpair_t *elem = NULL;
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boolean_t bool_value;
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nvlist_t *nvlist_value;
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nvlist_t **nvlist_array_value;
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uint_t i, count;
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int len = 0;
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int rc;
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char *buf_end = &buf[size];
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if (list == NULL)
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return (0);
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while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
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switch (nvpair_type(elem)) {
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case DATA_TYPE_BOOLEAN:
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rc = snprintf(buf, size, "%*s%s\n", indent, "",
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nvpair_name(elem));
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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break;
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case DATA_TYPE_BOOLEAN_VALUE:
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(void) nvpair_value_boolean_value(elem, &bool_value);
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rc = snprintf(buf, size, "%*s%s: %s\n", indent, "",
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nvpair_name(elem), bool_value ? "true" : "false");
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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break;
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case DATA_TYPE_BYTE:
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NVP(buf, size, len, buf_end, elem, byte, uchar_t, int,
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"%u");
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break;
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case DATA_TYPE_INT8:
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NVP(buf, size, len, buf_end, elem, int8, int8_t, int,
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"%d");
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break;
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case DATA_TYPE_UINT8:
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NVP(buf, size, len, buf_end, elem, uint8, uint8_t, int,
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"%u");
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break;
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case DATA_TYPE_INT16:
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NVP(buf, size, len, buf_end, elem, int16, int16_t, int,
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"%d");
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break;
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case DATA_TYPE_UINT16:
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NVP(buf, size, len, buf_end, elem, uint16, uint16_t,
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int, "%u");
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break;
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case DATA_TYPE_INT32:
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NVP(buf, size, len, buf_end, elem, int32, int32_t,
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long, "%ld");
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break;
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case DATA_TYPE_UINT32:
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NVP(buf, size, len, buf_end, elem, uint32, uint32_t,
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ulong_t, "%lu");
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break;
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case DATA_TYPE_INT64:
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NVP(buf, size, len, buf_end, elem, int64, int64_t,
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longlong_t, "%lld");
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break;
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case DATA_TYPE_UINT64:
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NVP(buf, size, len, buf_end, elem, uint64, uint64_t,
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u_longlong_t, "%llu");
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break;
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case DATA_TYPE_STRING:
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NVP(buf, size, len, buf_end, elem, string, const char *,
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const char *, "'%s'");
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break;
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case DATA_TYPE_BYTE_ARRAY:
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NVPA(buf, size, len, buf_end, elem, byte_array, uchar_t,
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int, "%u");
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break;
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case DATA_TYPE_INT8_ARRAY:
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NVPA(buf, size, len, buf_end, elem, int8_array, int8_t,
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int, "%d");
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break;
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case DATA_TYPE_UINT8_ARRAY:
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NVPA(buf, size, len, buf_end, elem, uint8_array,
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uint8_t, int, "%u");
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break;
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case DATA_TYPE_INT16_ARRAY:
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NVPA(buf, size, len, buf_end, elem, int16_array,
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int16_t, int, "%d");
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break;
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case DATA_TYPE_UINT16_ARRAY:
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NVPA(buf, size, len, buf_end, elem, uint16_array,
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uint16_t, int, "%u");
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break;
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case DATA_TYPE_INT32_ARRAY:
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NVPA(buf, size, len, buf_end, elem, int32_array,
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int32_t, long, "%ld");
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break;
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case DATA_TYPE_UINT32_ARRAY:
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NVPA(buf, size, len, buf_end, elem, uint32_array,
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uint32_t, ulong_t, "%lu");
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break;
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case DATA_TYPE_INT64_ARRAY:
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NVPA(buf, size, len, buf_end, elem, int64_array,
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int64_t, longlong_t, "%lld");
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break;
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case DATA_TYPE_UINT64_ARRAY:
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NVPA(buf, size, len, buf_end, elem, uint64_array,
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uint64_t, u_longlong_t, "%llu");
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break;
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case DATA_TYPE_STRING_ARRAY:
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NVPA(buf, size, len, buf_end, elem, string_array,
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const char *, const char *, "'%s'");
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break;
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case DATA_TYPE_NVLIST:
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(void) nvpair_value_nvlist(elem, &nvlist_value);
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rc = snprintf(buf, size, "%*s%s:\n", indent, "",
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nvpair_name(elem));
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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rc = nvlist_snprintf(buf, size, nvlist_value,
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indent + 4);
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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break;
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case DATA_TYPE_NVLIST_ARRAY:
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(void) nvpair_value_nvlist_array(elem,
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&nvlist_array_value, &count);
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for (i = 0; i < count; i++) {
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rc = snprintf(buf, size, "%*s%s[%u]:\n",
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indent, "", nvpair_name(elem), i);
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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rc = nvlist_snprintf(buf, size,
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nvlist_array_value[i], indent + 4);
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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}
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break;
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default:
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rc = snprintf(buf, size, "bad config type %d for %s\n",
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nvpair_type(elem), nvpair_name(elem));
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if (rc < 0)
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return (rc);
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size = MAX((int)size - rc, 0);
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buf = size == 0 ? NULL : buf_end - size;
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len += rc;
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}
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}
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return (len);
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}
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EXPORT_SYMBOL(nv_alloc_init);
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EXPORT_SYMBOL(nv_alloc_reset);
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EXPORT_SYMBOL(nv_alloc_fini);
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@@ -3766,6 +4000,8 @@ EXPORT_SYMBOL(nvlist_lookup_pairs);
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EXPORT_SYMBOL(nvlist_lookup_nvpair);
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EXPORT_SYMBOL(nvlist_exists);
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EXPORT_SYMBOL(nvlist_snprintf);
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/* processing nvpair */
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EXPORT_SYMBOL(nvpair_name);
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EXPORT_SYMBOL(nvpair_type);
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