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Add missing code to zfs_debug.{c,h}

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This is required to make Illumos 3962 merge.

Signed-off-by: Richard Yao <ryao@gentoo.org>
This commit is contained in:
Richard Yao
2013-10-08 22:37:38 -04:00
committed by Brian Behlendorf
parent 632a242e83
commit 495b25a91a
2 changed files with 97 additions and 4 deletions
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module/zfs/zfs_debug.c
+68
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@@ -25,6 +25,13 @@
#include <sys/zfs_context.h>
#if !defined(_KERNEL) || !defined(__linux__)
list_t zfs_dbgmsgs;
int zfs_dbgmsg_size;
kmutex_t zfs_dbgmsgs_lock;
int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
#endif
/*
* Enable various debugging features.
*/
@@ -57,6 +64,12 @@ zfs_panic_recover(const char *fmt, ...)
void
zfs_dbgmsg_init(void)
{
#if !defined(_KERNEL) || !defined(__linux__)
list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
offsetof(zfs_dbgmsg_t, zdm_node));
mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
#endif
if (zfs_flags == 0) {
#if defined(_KERNEL)
zfs_flags = ZFS_DEBUG_DPRINTF;
@@ -71,9 +84,64 @@ zfs_dbgmsg_init(void)
void
zfs_dbgmsg_fini(void)
{
#if !defined(_KERNEL) || !defined(__linux__)
zfs_dbgmsg_t *zdm;
while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
kmem_free(zdm, size);
zfs_dbgmsg_size -= size;
}
mutex_destroy(&zfs_dbgmsgs_lock);
ASSERT0(zfs_dbgmsg_size);
#endif
return;
}
#if !defined(_KERNEL) || !defined(__linux__)
/*
* Print these messages by running:
* echo ::zfs_dbgmsg | mdb -k
*
* Monitor these messages by running:
* dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
*/
void
zfs_dbgmsg(const char *fmt, ...)
{
int size;
va_list adx;
zfs_dbgmsg_t *zdm;
va_start(adx, fmt);
size = vsnprintf(NULL, 0, fmt, adx);
va_end(adx);
/*
* There is one byte of string in sizeof (zfs_dbgmsg_t), used
* for the terminating null.
*/
zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
zdm->zdm_timestamp = gethrestime_sec();
va_start(adx, fmt);
(void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
va_end(adx);
DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
mutex_enter(&zfs_dbgmsgs_lock);
list_insert_tail(&zfs_dbgmsgs, zdm);
zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
zdm = list_remove_head(&zfs_dbgmsgs);
size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
kmem_free(zdm, size);
zfs_dbgmsg_size -= size;
}
mutex_exit(&zfs_dbgmsgs_lock);
}
#endif
#if defined(_KERNEL)
module_param(zfs_flags, int, 0644);