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zfs_debug: Restore log size limit for userspace #16664

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Merged
merged 1 commit into from
Oct 20, 2024
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zfs_debug: Restore log size limit for userspace #16664

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18 changes: 18 additions & 0 deletions lib/libzpool/zfs_debug.c
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,25 @@ typedef struct zfs_dbgmsg {

static list_t zfs_dbgmsgs;
static kmutex_t zfs_dbgmsgs_lock;
static uint_t zfs_dbgmsg_size = 0;
static uint_t zfs_dbgmsg_maxsize = 4<<20; /* 4MB */

int zfs_dbgmsg_enable = B_TRUE;

static void
zfs_dbgmsg_purge(uint_t max_size)
{
while (zfs_dbgmsg_size > max_size) {
zfs_dbgmsg_t *zdm = list_remove_head(&zfs_dbgmsgs);
if (zdm == NULL)
return;

uint_t size = zdm->zdm_size;
kmem_free(zdm, size);
zfs_dbgmsg_size -= size;
}
}

void
zfs_dbgmsg_init(void)
{
Expand Down Expand Up @@ -74,6 +90,8 @@ __zfs_dbgmsg(char *buf)

mutex_enter(&zfs_dbgmsgs_lock);
list_insert_tail(&zfs_dbgmsgs, zdm);
zfs_dbgmsg_size += size;
zfs_dbgmsg_purge(zfs_dbgmsg_maxsize);
mutex_exit(&zfs_dbgmsgs_lock);
}

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