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authorEric Van Hensbergen <ericvh@gmail.com>2005-09-09 13:04:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 13:57:57 -0700
commit3ed8491c8a75cefe95b57f7f428a3e2ddd421e97 (patch)
tree51729254e5b96f0a6794a7e11b51c5d67d9df874 /fs/9p/error.c
parent322b329ab787de5f45abca9c9eabfd33bc5927e8 (diff)
downloadop-kernel-dev-3ed8491c8a75cefe95b57f7f428a3e2ddd421e97.zip
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[PATCH] v9fs: debug and support routines
This part of the patch contains debug and other misc routines. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/9p/error.c')
-rw-r--r--fs/9p/error.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/fs/9p/error.c b/fs/9p/error.c
new file mode 100644
index 0000000..fee5d19
--- /dev/null
+++ b/fs/9p/error.c
@@ -0,0 +1,93 @@
+/*
+ * linux/fs/9p/error.c
+ *
+ * Error string handling
+ *
+ * Plan 9 uses error strings, Unix uses error numbers. These functions
+ * try to help manage that and provide for dynamically adding error
+ * mappings.
+ *
+ * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to:
+ * Free Software Foundation
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA 02111-1301 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/list.h>
+#include <linux/jhash.h>
+
+#include "debug.h"
+#include "error.h"
+
+/**
+ * v9fs_error_init - preload
+ * @errstr: error string
+ *
+ */
+
+int v9fs_error_init(void)
+{
+ struct errormap *c;
+ int bucket;
+
+ /* initialize hash table */
+ for (bucket = 0; bucket < ERRHASHSZ; bucket++)
+ INIT_HLIST_HEAD(&hash_errmap[bucket]);
+
+ /* load initial error map into hash table */
+ for (c = errmap; c->name != NULL; c++) {
+ bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
+ INIT_HLIST_NODE(&c->list);
+ hlist_add_head(&c->list, &hash_errmap[bucket]);
+ }
+
+ return 1;
+}
+
+/**
+ * errstr2errno - convert error string to error number
+ * @errstr: error string
+ *
+ */
+
+int v9fs_errstr2errno(char *errstr)
+{
+ int errno = 0;
+ struct hlist_node *p = NULL;
+ struct errormap *c = NULL;
+ int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
+
+ hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
+ if (!strcmp(c->name, errstr)) {
+ errno = c->val;
+ break;
+ }
+ }
+
+ if (errno == 0) {
+ /* TODO: if error isn't found, add it dynamically */
+ printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
+ errstr);
+ errno = 1;
+ }
+
+ return -errno;
+}
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