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nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist()

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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
2025-04-18 06:22:16 -07:00
committed by GitHub
parent ba03054c83
commit 8d1489735b
12 changed files with 488 additions and 332 deletions
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include/sys/nvpair.h
+2
View File
@@ -267,6 +267,8 @@ _SYS_NVPAIR_H int nvlist_lookup_double(const nvlist_t *, const char *,
double *);
#endif
_SYS_NVPAIR_H int nvlist_snprintf(char *, size_t, nvlist_t *, int);
_SYS_NVPAIR_H int nvlist_lookup_nvpair(nvlist_t *, const char *, nvpair_t **);
_SYS_NVPAIR_H int nvlist_lookup_nvpair_embedded_index(nvlist_t *, const char *,
nvpair_t **, int *, const char **);
include/sys/zfs_debug.h
+20
View File
@@ -39,6 +39,8 @@ extern "C" {
#define FALSE 0
#endif
#include <sys/nvpair.h>
extern int zfs_flags;
extern int zfs_recover;
extern int zfs_free_leak_on_eio;
@@ -104,6 +106,24 @@ extern void zfs_panic_recover(const char *fmt, ...);
extern void zfs_dbgmsg_init(void);
extern void zfs_dbgmsg_fini(void);
/*
* When printing an nvlist, print one beginning line with the file/func/line
* number and the text "nvlist <var name>:" followed by all the nvlist lines
* without the file/fun/line number. This makes the nvlist lines easy to read.
*/
#define zfs_dbgmsg_nvlist(nv) \
if (zfs_dbgmsg_enable) { \
zfs_dbgmsg("nvlist "#nv":"); \
__zfs_dbgmsg_nvlist(nv); \
}
#define zfs_dbgmsg(...) \
if (zfs_dbgmsg_enable) \
__dprintf(B_FALSE, __FILE__, __func__, __LINE__, __VA_ARGS__)
extern void __zfs_dbgmsg_nvlist(nvlist_t *nv);
#ifndef _KERNEL
extern int dprintf_find_string(const char *string);
extern void zfs_dbgmsg_print(int fd, const char *tag);