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zdb/ztest: send dbgmsg output to stderr

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And, make the output fd an arg to zfs_dbgmsg_print(). This is a change
in behaviour, but keeps it consistent with where crash traces go, and
it's easy to argue this is what we want anyway; this is information
about the task, not the actual output of the task.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #16181
This commit is contained in:
Rob Norris 2024-05-10 13:58:26 +10:00 committed by Tony Hutter
parent 63f70d3c61
commit 16266b47a1
5 changed files with 26 additions and 28 deletions
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4
cmd/zdb/zdb.c
View File

@ -938,8 +938,8 @@ dump_debug_buffer(void)
* We use write() instead of printf() so that this function
* is safe to call from a signal handler.
*/
ret = write(STDOUT_FILENO, "\n", 1);
zfs_dbgmsg_print("zdb");
ret = write(STDERR_FILENO, "\n", 1);
zfs_dbgmsg_print(STDERR_FILENO, "zdb");
}
#define BACKTRACE_SZ 100

4
cmd/ztest.c
View File

@ -593,8 +593,8 @@ dump_debug_buffer(void)
* We use write() instead of printf() so that this function
* is safe to call from a signal handler.
*/
ret = write(STDOUT_FILENO, "\n", 1);
zfs_dbgmsg_print("ztest");
ret = write(STDERR_FILENO, "\n", 1);
zfs_dbgmsg_print(STDERR_FILENO, "ztest");
}
#define BACKTRACE_SZ 100

2
include/sys/zfs_debug.h
View File

@ -103,7 +103,7 @@ extern void zfs_dbgmsg_fini(void);
#ifndef _KERNEL
extern int dprintf_find_string(const char *string);
extern void zfs_dbgmsg_print(const char *tag);
extern void zfs_dbgmsg_print(int fd, const char *tag);
#endif
#ifdef __cplusplus

25
module/os/freebsd/zfs/zfs_debug.c
View File

@ -232,30 +232,29 @@ __dprintf(boolean_t dprint, const char *file, const char *func,
#else
void
zfs_dbgmsg_print(const char *tag)
zfs_dbgmsg_print(int fd, const char *tag)
{
ssize_t ret __attribute__((unused));
mutex_enter(&zfs_dbgmsgs_lock);
/*
* We use write() in this function instead of printf()
* so it is safe to call from a signal handler.
*/
ret = write(STDOUT_FILENO, "ZFS_DBGMSG(", 11);
ret = write(STDOUT_FILENO, tag, strlen(tag));
ret = write(STDOUT_FILENO, ") START:\n", 9);
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") START:\n", 9);
for (zfs_dbgmsg_t zdm = list_head(&zfs_dbgmsgs); zdm != NULL;
mutex_enter(&zfs_dbgmsgs_lock);
for (zfs_dbgmsg_t *zdm = list_head(&zfs_dbgmsgs); zdm != NULL;
zdm = list_next(&zfs_dbgmsgs, zdm))
ret = write(STDOUT_FILENO, zdm->zdm_msg,
strlen(zdm->zdm_msg));
ret = write(STDOUT_FILENO, "\n", 1);
ret = write(fd, zdm->zdm_msg, strlen(zdm->zdm_msg));
ret = write(fd, "\n", 1);
}
ret = write(STDOUT_FILENO, "ZFS_DBGMSG(", 11);
ret = write(STDOUT_FILENO, tag, strlen(tag));
ret = write(STDOUT_FILENO, ") END\n", 6);
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") END\n", 6);
mutex_exit(&zfs_dbgmsgs_lock);
}

19
module/os/linux/zfs/zfs_debug.c
View File

@ -220,7 +220,7 @@ __dprintf(boolean_t dprint, const char *file, const char *func,
#else
void
zfs_dbgmsg_print(const char *tag)
zfs_dbgmsg_print(int fd, const char *tag)
{
ssize_t ret __attribute__((unused));
@ -230,20 +230,19 @@ zfs_dbgmsg_print(const char *tag)
* We use write() in this function instead of printf()
* so it is safe to call from a signal handler.
*/
ret = write(STDOUT_FILENO, "ZFS_DBGMSG(", 11);
ret = write(STDOUT_FILENO, tag, strlen(tag));
ret = write(STDOUT_FILENO, ") START:\n", 9);
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") START:\n", 9);
for (zfs_dbgmsg_t *zdm = list_head(&zfs_dbgmsgs.pl_list); zdm != NULL;
zdm = list_next(&zfs_dbgmsgs.pl_list, zdm)) {
ret = write(STDOUT_FILENO, zdm->zdm_msg,
strlen(zdm->zdm_msg));
ret = write(STDOUT_FILENO, "\n", 1);
ret = write(fd, zdm->zdm_msg, strlen(zdm->zdm_msg));
ret = write(fd, "\n", 1);
}
ret = write(STDOUT_FILENO, "ZFS_DBGMSG(", 11);
ret = write(STDOUT_FILENO, tag, strlen(tag));
ret = write(STDOUT_FILENO, ") END\n", 6);
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") END\n", 6);
mutex_exit(&zfs_dbgmsgs.pl_lock);
}