From: Ian Jackson <ian.jackson@eu.citrix.com>
To: xen-devel@lists.xen.org
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Subject: [PATCH 2/3] xl: disk parsing preparation for empty cdrom devices
Date: Wed, 25 Jul 2012 17:08:05 +0100 [thread overview]
Message-ID: <1343232486-2943-3-git-send-email-ian.jackson@eu.citrix.com> (raw)
In-Reply-To: <1343232486-2943-1-git-send-email-ian.jackson@eu.citrix.com>
Prepare the ground for parsing the xend empty cdrom syntax, by
separating out some non-functional changes as this pre-patch:
* Clarify the disk syntax documentation wording to refer to deprecated
syntaxes too.
* Make DPC in libxlu_disk_l.l useable in the helper functions as well
as in lexer rules, by providing two definitions, each in force in
the appropriate parts of the file.
* Break the <vdev>[:<devtype>] parsing out into a helper function,
`vdev_and_devtype'.
No functional change.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
docs/misc/xl-disk-configuration.txt | 11 ++--
tools/libxl/libxlu_disk_l.c | 104 +++++++++++++++++++---------------
tools/libxl/libxlu_disk_l.h | 2 +-
tools/libxl/libxlu_disk_l.l | 44 +++++++++-----
4 files changed, 93 insertions(+), 68 deletions(-)
diff --git a/docs/misc/xl-disk-configuration.txt b/docs/misc/xl-disk-configuration.txt
index 3bf20bf..740b8f6 100644
--- a/docs/misc/xl-disk-configuration.txt
+++ b/docs/misc/xl-disk-configuration.txt
@@ -164,16 +164,17 @@ information to be interpreted by /etc/xen/scripts/block-<script>.
-==================================
-DEPRECATED PARAMETERS AND PREFIXES
-==================================
+============================================
+DEPRECATED PARAMETERS, PREFIXES AND SYNTAXES
+============================================
-Deprecated values are acceptable and are intended work compatibly with
+Deprecated forms are acceptable and are intended work compatibly with
xend and xl from xen 4.1. In future they may print a warning.
Support for deprecated parameters and syntaxes are likely to be
dropped in future versions of xl.
-There is also support for a deprecated old syntax for <diskspec>:
+
+There is support for a deprecated old syntax for <diskspec>:
[<format>:][<target>],<vdev>[:<devtype>],<access> (deprecated)
diff --git a/tools/libxl/libxlu_disk_l.c b/tools/libxl/libxlu_disk_l.c
index 8b9f44d..b4ad651 100644
--- a/tools/libxl/libxlu_disk_l.c
+++ b/tools/libxl/libxlu_disk_l.c
@@ -794,8 +794,6 @@ void xlu__disk_yyset_column(int column_no, yyscan_t yyscanner);
* and particularly to avoid repeating boilerplate values such as
* DPC->disk, yytext, etc. */
-#define DPC ((DiskParseContext*)yyextra)
-
/* Sets an enum, checking it hasn't already been set to a different value */
#define DSET(dpc,member,enumname,str,valname) do{ \
if (dpc->disk->member != LIBXL_DISK_##enumname##_UNKNOWN && \
@@ -828,6 +826,8 @@ static void savestring(DiskParseContext *dpc, const char *what_respecified,
*update = strdup(value);
}
+#define DPC dpc /* our convention in lexer helper functions */
+
/* Sets ->readwrite from the string. This ought to be an enum, perhaps. */
static void setaccess(DiskParseContext *dpc, const char *str) {
if (!strcmp(str, "r") || !strcmp(str, "ro")) {
@@ -860,8 +860,32 @@ static void setbackendtype(DiskParseContext *dpc, const char *str) {
#define DEPRECATE(usewhatinstead) /* not currently reported */
+/* Handles a vdev positional parameter which includes a devtype. */
+static int vdev_and_devtype(DiskParseContext *dpc, char *str) {
+ /* returns 1 if it was <vdev>:<devtype>, 0 (doing nothing) otherwise */
+ char *colon = strrchr(str, ':');
+ if (!colon)
+ return 0;
+
+ DEPRECATE("use `devtype=...'");
+ *colon++ = 0;
+ SAVESTRING("vdev", vdev, str);
+
+ if (!strcmp(colon,"cdrom")) {
+ DPC->disk->is_cdrom = 1;
+ } else if (!strcmp(colon,"disk")) {
+ DPC->disk->is_cdrom = 0;
+ } else {
+ xlu__disk_err(DPC,colon,"unknown deprecated type");
+ }
+ return 1;
+}
-#line 865 "libxlu_disk_l.c"
+#undef DPC /* needs to be defined differently the actual lexer */
+#define DPC ((DiskParseContext*)yyextra)
+
+
+#line 889 "libxlu_disk_l.c"
#define INITIAL 0
#define LEXERR 1
@@ -1097,12 +1121,12 @@ YY_DECL
register int yy_act;
struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
-#line 127 "libxlu_disk_l.l"
+#line 151 "libxlu_disk_l.l"
/*----- the scanner rules which do the parsing -----*/
-#line 1106 "libxlu_disk_l.c"
+#line 1130 "libxlu_disk_l.c"
if ( !yyg->yy_init )
{
@@ -1223,72 +1247,72 @@ do_action: /* This label is used only to access EOF actions. */
case 1:
/* rule 1 can match eol */
YY_RULE_SETUP
-#line 130 "libxlu_disk_l.l"
+#line 155 "libxlu_disk_l.l"
{ /* ignore whitespace before parameters */ }
YY_BREAK
/* ordinary parameters setting enums or strings */
case 2:
/* rule 2 can match eol */
YY_RULE_SETUP
-#line 134 "libxlu_disk_l.l"
+#line 159 "libxlu_disk_l.l"
{ STRIP(','); setformat(DPC, FROMEQUALS); }
YY_BREAK
case 3:
YY_RULE_SETUP
-#line 136 "libxlu_disk_l.l"
+#line 161 "libxlu_disk_l.l"
{ DPC->disk->is_cdrom = 1; }
YY_BREAK
case 4:
YY_RULE_SETUP
-#line 137 "libxlu_disk_l.l"
+#line 162 "libxlu_disk_l.l"
{ DPC->disk->is_cdrom = 1; }
YY_BREAK
case 5:
YY_RULE_SETUP
-#line 138 "libxlu_disk_l.l"
+#line 163 "libxlu_disk_l.l"
{ DPC->disk->is_cdrom = 0; }
YY_BREAK
case 6:
/* rule 6 can match eol */
YY_RULE_SETUP
-#line 139 "libxlu_disk_l.l"
+#line 164 "libxlu_disk_l.l"
{ xlu__disk_err(DPC,yytext,"unknown value for type"); }
YY_BREAK
case 7:
/* rule 7 can match eol */
YY_RULE_SETUP
-#line 141 "libxlu_disk_l.l"
+#line 166 "libxlu_disk_l.l"
{ STRIP(','); setaccess(DPC, FROMEQUALS); }
YY_BREAK
case 8:
/* rule 8 can match eol */
YY_RULE_SETUP
-#line 142 "libxlu_disk_l.l"
+#line 167 "libxlu_disk_l.l"
{ STRIP(','); setbackendtype(DPC,FROMEQUALS); }
YY_BREAK
case 9:
/* rule 9 can match eol */
YY_RULE_SETUP
-#line 144 "libxlu_disk_l.l"
+#line 169 "libxlu_disk_l.l"
{ STRIP(','); SAVESTRING("vdev", vdev, FROMEQUALS); }
YY_BREAK
case 10:
/* rule 10 can match eol */
YY_RULE_SETUP
-#line 145 "libxlu_disk_l.l"
+#line 170 "libxlu_disk_l.l"
{ STRIP(','); SAVESTRING("script", script, FROMEQUALS); }
YY_BREAK
/* the target magic parameter, eats the rest of the string */
case 11:
YY_RULE_SETUP
-#line 149 "libxlu_disk_l.l"
+#line 174 "libxlu_disk_l.l"
{ STRIP(','); SAVESTRING("target", pdev_path, FROMEQUALS); }
YY_BREAK
/* unknown parameters */
case 12:
/* rule 12 can match eol */
YY_RULE_SETUP
-#line 153 "libxlu_disk_l.l"
+#line 178 "libxlu_disk_l.l"
{ xlu__disk_err(DPC,yytext,"unknown parameter"); }
YY_BREAK
/* deprecated prefixes */
@@ -1296,7 +1320,7 @@ YY_RULE_SETUP
* matched the whole string, so these patterns take precedence */
case 13:
YY_RULE_SETUP
-#line 161 "libxlu_disk_l.l"
+#line 185 "libxlu_disk_l.l"
{
STRIP(':');
DPC->had_depr_prefix=1; DEPRECATE("use `[format=]...,'");
@@ -1305,7 +1329,7 @@ YY_RULE_SETUP
YY_BREAK
case 14:
YY_RULE_SETUP
-#line 167 "libxlu_disk_l.l"
+#line 191 "libxlu_disk_l.l"
{
STRIP(':');
DPC->had_depr_prefix=1; DEPRECATE("use `script=...'");
@@ -1317,12 +1341,12 @@ case 15:
yyg->yy_c_buf_p = yy_cp = yy_bp + 8;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
-#line 172 "libxlu_disk_l.l"
+#line 197 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 16:
YY_RULE_SETUP
-#line 173 "libxlu_disk_l.l"
+#line 198 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 17:
@@ -1330,7 +1354,7 @@ case 17:
yyg->yy_c_buf_p = yy_cp = yy_bp + 4;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
-#line 175 "libxlu_disk_l.l"
+#line 199 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 18:
@@ -1338,7 +1362,7 @@ case 18:
yyg->yy_c_buf_p = yy_cp = yy_bp + 6;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
-#line 176 "libxlu_disk_l.l"
+#line 200 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 19:
@@ -1346,7 +1370,7 @@ case 19:
yyg->yy_c_buf_p = yy_cp = yy_bp + 5;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
-#line 177 "libxlu_disk_l.l"
+#line 201 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 20:
@@ -1354,13 +1378,13 @@ case 20:
yyg->yy_c_buf_p = yy_cp = yy_bp + 4;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
-#line 177 "libxlu_disk_l.l"
+#line 202 "libxlu_disk_l.l"
{ DPC->had_depr_prefix=1; DEPRECATE(0); }
YY_BREAK
case 21:
/* rule 21 can match eol */
YY_RULE_SETUP
-#line 179 "libxlu_disk_l.l"
+#line 204 "libxlu_disk_l.l"
{
xlu__disk_err(DPC,yytext,"unknown deprecated disk prefix");
return 0;
@@ -1370,9 +1394,8 @@ YY_RULE_SETUP
case 22:
/* rule 22 can match eol */
YY_RULE_SETUP
-#line 187 "libxlu_disk_l.l"
+#line 211 "libxlu_disk_l.l"
{
- char *colon;
STRIP(',');
if (DPC->err) {
@@ -1383,19 +1406,8 @@ YY_RULE_SETUP
DPC->disk->format == LIBXL_DISK_FORMAT_UNKNOWN) {
setformat(DPC,yytext);
} else if (!DPC->disk->vdev) {
- colon = strrchr(yytext, ':');
- if (colon) {
- DEPRECATE("use `devtype=...'");
- *colon++ = 0;
- if (!strcmp(colon,"cdrom")) {
- DPC->disk->is_cdrom = 1;
- } else if (!strcmp(colon,"disk")) {
- DPC->disk->is_cdrom = 0;
- } else {
- xlu__disk_err(DPC,colon,"unknown deprecated type");
- }
- }
- SAVESTRING("vdev", vdev, yytext);
+ if (!vdev_and_devtype(DPC,yytext))
+ SAVESTRING("vdev", vdev, yytext);
} else if (!DPC->access_set) {
DPC->access_set = 1;
setaccess(DPC,yytext);
@@ -1407,7 +1419,7 @@ YY_RULE_SETUP
YY_BREAK
case 23:
YY_RULE_SETUP
-#line 221 "libxlu_disk_l.l"
+#line 233 "libxlu_disk_l.l"
{
BEGIN(LEXERR);
yymore();
@@ -1415,17 +1427,17 @@ YY_RULE_SETUP
YY_BREAK
case 24:
YY_RULE_SETUP
-#line 224 "libxlu_disk_l.l"
+#line 237 "libxlu_disk_l.l"
{
xlu__disk_err(DPC,yytext,"bad disk syntax"); return 0;
}
YY_BREAK
case 25:
YY_RULE_SETUP
-#line 227 "libxlu_disk_l.l"
+#line 240 "libxlu_disk_l.l"
YY_FATAL_ERROR( "flex scanner jammed" );
YY_BREAK
-#line 1428 "libxlu_disk_l.c"
+#line 1441 "libxlu_disk_l.c"
case YY_STATE_EOF(INITIAL):
case YY_STATE_EOF(LEXERR):
yyterminate();
@@ -2517,4 +2529,4 @@ void xlu__disk_yyfree (void * ptr , yyscan_t yyscanner)
#define YYTABLES_NAME "yytables"
-#line 228 "libxlu_disk_l.l"
+#line 240 "libxlu_disk_l.l"
diff --git a/tools/libxl/libxlu_disk_l.h b/tools/libxl/libxlu_disk_l.h
index 87bf96c..4d0328e 100644
--- a/tools/libxl/libxlu_disk_l.h
+++ b/tools/libxl/libxlu_disk_l.h
@@ -340,7 +340,7 @@ extern int xlu__disk_yylex (yyscan_t yyscanner);
#undef YY_DECL
#endif
-#line 228 "libxlu_disk_l.l"
+#line 240 "libxlu_disk_l.l"
#line 346 "libxlu_disk_l.h"
#undef xlu__disk_yyIN_HEADER
diff --git a/tools/libxl/libxlu_disk_l.l b/tools/libxl/libxlu_disk_l.l
index 6e53928..7e0a635 100644
--- a/tools/libxl/libxlu_disk_l.l
+++ b/tools/libxl/libxlu_disk_l.l
@@ -45,8 +45,6 @@ void xlu__disk_yyset_column(int column_no, yyscan_t yyscanner);
* and particularly to avoid repeating boilerplate values such as
* DPC->disk, yytext, etc. */
-#define DPC ((DiskParseContext*)yyextra)
-
/* Sets an enum, checking it hasn't already been set to a different value */
#define DSET(dpc,member,enumname,str,valname) do{ \
if (dpc->disk->member != LIBXL_DISK_##enumname##_UNKNOWN && \
@@ -79,6 +77,8 @@ static void savestring(DiskParseContext *dpc, const char *what_respecified,
*update = strdup(value);
}
+#define DPC dpc /* our convention in lexer helper functions */
+
/* Sets ->readwrite from the string. This ought to be an enum, perhaps. */
static void setaccess(DiskParseContext *dpc, const char *str) {
if (!strcmp(str, "r") || !strcmp(str, "ro")) {
@@ -111,6 +111,30 @@ static void setbackendtype(DiskParseContext *dpc, const char *str) {
#define DEPRECATE(usewhatinstead) /* not currently reported */
+/* Handles a vdev positional parameter which includes a devtype. */
+static int vdev_and_devtype(DiskParseContext *dpc, char *str) {
+ /* returns 1 if it was <vdev>:<devtype>, 0 (doing nothing) otherwise */
+ char *colon = strrchr(str, ':');
+ if (!colon)
+ return 0;
+
+ DEPRECATE("use `devtype=...'");
+ *colon++ = 0;
+ SAVESTRING("vdev", vdev, str);
+
+ if (!strcmp(colon,"cdrom")) {
+ DPC->disk->is_cdrom = 1;
+ } else if (!strcmp(colon,"disk")) {
+ DPC->disk->is_cdrom = 0;
+ } else {
+ xlu__disk_err(DPC,colon,"unknown deprecated type");
+ }
+ return 1;
+}
+
+#undef DPC /* needs to be defined differently the actual lexer */
+#define DPC ((DiskParseContext*)yyextra)
+
%}
%option warn
@@ -185,7 +209,6 @@ phy:/.* { DPC->had_depr_prefix=1; DEPRECATE(0); }
/* positional parameters */
[^=,]*,|[^=,]+,? {
- char *colon;
STRIP(',');
if (DPC->err) {
@@ -196,19 +219,8 @@ phy:/.* { DPC->had_depr_prefix=1; DEPRECATE(0); }
DPC->disk->format == LIBXL_DISK_FORMAT_UNKNOWN) {
setformat(DPC,yytext);
} else if (!DPC->disk->vdev) {
- colon = strrchr(yytext, ':');
- if (colon) {
- DEPRECATE("use `devtype=...'");
- *colon++ = 0;
- if (!strcmp(colon,"cdrom")) {
- DPC->disk->is_cdrom = 1;
- } else if (!strcmp(colon,"disk")) {
- DPC->disk->is_cdrom = 0;
- } else {
- xlu__disk_err(DPC,colon,"unknown deprecated type");
- }
- }
- SAVESTRING("vdev", vdev, yytext);
+ if (!vdev_and_devtype(DPC,yytext))
+ SAVESTRING("vdev", vdev, yytext);
} else if (!DPC->access_set) {
DPC->access_set = 1;
setaccess(DPC,yytext);
--
1.7.2.5
next prev parent reply other threads:[~2012-07-25 16:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-25 16:08 [PATCH v2 0/3] xl: empty disk devices Ian Jackson
2012-07-25 16:08 ` [PATCH 1/3] xl: support empty CDROM devices Ian Jackson
2012-07-25 16:08 ` Ian Jackson [this message]
2012-07-25 16:08 ` [PATCH 3/3] xl: support xend empty cdrom device syntax Ian Jackson
2012-07-26 9:35 ` [PATCH v2 0/3] xl: empty disk devices Ian Campbell
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