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https://git.proxmox.com/git/mirror_zfs.git
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04a479f706
not to support a few flags (we assert if they are used), and I did not add the libkstat interface and instead exported everything to proc for easy access. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@103 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
471 lines
13 KiB
C
471 lines
13 KiB
C
#include <sys/kstat.h>
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#ifdef DEBUG_KSTAT
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static spinlock_t kstat_lock;
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static struct list_head kstat_list;
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static kid_t kstat_id;
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static void
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kstat_seq_show_headers(struct seq_file *f)
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{
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kstat_t *ksp = (kstat_t *)f->private;
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ASSERT(ksp->ks_magic == KS_MAGIC);
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seq_printf(f, "%d %d 0x%02x %d %d %lld %lld\n",
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ksp->ks_kid, ksp->ks_type, ksp->ks_flags,
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ksp->ks_ndata, (int)ksp->ks_data_size,
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ksp->ks_crtime, ksp->ks_snaptime);
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switch (ksp->ks_type) {
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case KSTAT_TYPE_RAW:
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seq_printf(f, "raw data");
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break;
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case KSTAT_TYPE_NAMED:
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seq_printf(f, "%-31s %-4s %s\n",
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"name", "type", "data");
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break;
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case KSTAT_TYPE_INTR:
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seq_printf(f, "%-8s %-8s %-8s %-8s %-8s\n",
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"hard", "soft", "watchdog",
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"spurious", "multsvc");
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break;
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case KSTAT_TYPE_IO:
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seq_printf(f,
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"%-8s %-8s %-8s %-8s %-8s %-8s "
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"%-8s %-8s %-8s %-8s %-8s %-8s\n",
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"nread", "nwritten", "reads", "writes",
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"wtime", "wlentime", "wupdate",
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"rtime", "rlentime", "rupdate",
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"wcnt", "rcnt");
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break;
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case KSTAT_TYPE_TIMER:
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seq_printf(f,
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"%-31s %-8s "
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"%-8s %-8s %-8s %-8s %-8s\n",
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"name", "events", "elapsed",
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"min", "max", "start", "stop");
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break;
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default:
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SBUG(); /* Unreachable */
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}
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}
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static int
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kstat_seq_show_raw(struct seq_file *f, unsigned char *p, int l)
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{
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int i, j;
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for (i = 0; ; i++) {
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seq_printf(f, "%03x:", i);
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for (j = 0; j < 16; j++) {
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if (i * 16 + j >= l) {
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seq_printf(f, "\n");
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goto out;
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}
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seq_printf(f, " %02x", (unsigned char)p[i * 16 + j]);
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}
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seq_printf(f, "\n");
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}
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out:
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return 0;
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}
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static int
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kstat_seq_show_named(struct seq_file *f, kstat_named_t *knp)
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{
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seq_printf(f, "%-31s %-4d ", knp->name, knp->data_type);
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switch (knp->data_type) {
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case KSTAT_DATA_CHAR:
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knp->value.c[15] = '\0'; /* NULL terminate */
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seq_printf(f, "%-16s", knp->value.c);
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break;
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/* XXX - We need to be more careful able what tokens are
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* used for each arch, for now this is correct for x86_64.
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*/
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case KSTAT_DATA_INT32:
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seq_printf(f, "%d", knp->value.i32);
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break;
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case KSTAT_DATA_UINT32:
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seq_printf(f, "%u", knp->value.ui32);
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break;
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case KSTAT_DATA_INT64:
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seq_printf(f, "%d", (int)knp->value.i64);
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break;
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case KSTAT_DATA_UINT64:
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seq_printf(f, "%u", (unsigned int)knp->value.ui64);
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break;
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case KSTAT_DATA_LONG:
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seq_printf(f, "%ld", knp->value.l);
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break;
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case KSTAT_DATA_ULONG:
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seq_printf(f, "%lu", knp->value.l);
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break;
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case KSTAT_DATA_STRING:
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KSTAT_NAMED_STR_PTR(knp)
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[KSTAT_NAMED_STR_BUFLEN(knp)-1] = '\0';
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seq_printf(f, "%s", KSTAT_NAMED_STR_PTR(knp));
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break;
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default:
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SBUG(); /* Unreachable */
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}
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seq_printf(f, "\n");
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return 0;
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}
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static int
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kstat_seq_show_intr(struct seq_file *f, kstat_intr_t *kip)
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{
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seq_printf(f, "%-8u %-8u %-8u %-8u %-8u\n",
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kip->intrs[KSTAT_INTR_HARD],
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kip->intrs[KSTAT_INTR_SOFT],
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kip->intrs[KSTAT_INTR_WATCHDOG],
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kip->intrs[KSTAT_INTR_SPURIOUS],
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kip->intrs[KSTAT_INTR_MULTSVC]);
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return 0;
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}
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static int
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kstat_seq_show_io(struct seq_file *f, kstat_io_t *kip)
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{
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seq_printf(f,
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"%-8llu %-8llu %-8u %-8u %-8lld %-8lld "
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"%-8lld %-8lld %-8lld %-8lld %-8u %-8u\n",
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kip->nread, kip->nwritten,
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kip->reads, kip->writes,
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kip->wtime, kip->wlentime, kip->wlastupdate,
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kip->rtime, kip->wlentime, kip->rlastupdate,
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kip->wcnt, kip->rcnt);
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return 0;
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}
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static int
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kstat_seq_show_timer(struct seq_file *f, kstat_timer_t *ktp)
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{
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seq_printf(f,
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"%-31s %-8llu %-8lld %-8lld %-8lld %-8lld %-8lld\n",
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ktp->name, ktp->num_events, ktp->elapsed_time,
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ktp->min_time, ktp->max_time,
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ktp->start_time, ktp->stop_time);
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return 0;
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}
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static int
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kstat_seq_show(struct seq_file *f, void *p)
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{
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kstat_t *ksp = (kstat_t *)f->private;
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int rc = 0;
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ASSERT(ksp->ks_magic == KS_MAGIC);
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switch (ksp->ks_type) {
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case KSTAT_TYPE_RAW:
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ASSERT(ksp->ks_ndata == 1);
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rc = kstat_seq_show_raw(f, ksp->ks_data,
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ksp->ks_data_size);
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break;
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case KSTAT_TYPE_NAMED:
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rc = kstat_seq_show_named(f, (kstat_named_t *)p);
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break;
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case KSTAT_TYPE_INTR:
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rc = kstat_seq_show_intr(f, (kstat_intr_t *)p);
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break;
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case KSTAT_TYPE_IO:
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rc = kstat_seq_show_io(f, (kstat_io_t *)p);
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break;
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case KSTAT_TYPE_TIMER:
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rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
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break;
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default:
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SBUG(); /* Unreachable */
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}
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return rc;
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}
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static void *
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kstat_seq_data_addr(kstat_t *ksp, loff_t n)
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{
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void *rc = NULL;
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ENTRY;
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switch (ksp->ks_type) {
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case KSTAT_TYPE_RAW:
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rc = ksp->ks_data;
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break;
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case KSTAT_TYPE_NAMED:
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rc = ksp->ks_data + n * sizeof(kstat_named_t);
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break;
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case KSTAT_TYPE_INTR:
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rc = ksp->ks_data + n * sizeof(kstat_intr_t);
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break;
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case KSTAT_TYPE_IO:
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rc = ksp->ks_data + n * sizeof(kstat_io_t);
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break;
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case KSTAT_TYPE_TIMER:
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rc = ksp->ks_data + n * sizeof(kstat_timer_t);
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break;
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default:
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SBUG(); /* Unreachable */
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}
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RETURN(rc);
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}
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static void *
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kstat_seq_start(struct seq_file *f, loff_t *pos)
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{
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loff_t n = *pos;
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kstat_t *ksp = (kstat_t *)f->private;
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ASSERT(ksp->ks_magic == KS_MAGIC);
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ENTRY;
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spin_lock(&ksp->ks_lock);
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ksp->ks_snaptime = gethrtime();
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if (!n)
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kstat_seq_show_headers(f);
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if (n >= ksp->ks_ndata)
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RETURN(NULL);
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RETURN(kstat_seq_data_addr(ksp, n));
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}
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static void *
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kstat_seq_next(struct seq_file *f, void *p, loff_t *pos)
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{
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kstat_t *ksp = (kstat_t *)f->private;
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ASSERT(ksp->ks_magic == KS_MAGIC);
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ENTRY;
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++*pos;
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if (*pos >= ksp->ks_ndata)
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RETURN(NULL);
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RETURN(kstat_seq_data_addr(ksp, *pos));
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}
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static void
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kstat_seq_stop(struct seq_file *f, void *v)
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{
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kstat_t *ksp = (kstat_t *)f->private;
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ASSERT(ksp->ks_magic == KS_MAGIC);
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spin_unlock(&ksp->ks_lock);
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}
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static struct seq_operations kstat_seq_ops = {
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.show = kstat_seq_show,
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.start = kstat_seq_start,
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.next = kstat_seq_next,
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.stop = kstat_seq_stop,
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};
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static int
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proc_kstat_open(struct inode *inode, struct file *filp)
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{
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struct seq_file *f;
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int rc;
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rc = seq_open(filp, &kstat_seq_ops);
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if (rc)
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return rc;
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f = filp->private_data;
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f->private = PDE(inode)->data;
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return rc;
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}
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static struct file_operations proc_kstat_operations = {
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.open = proc_kstat_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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kstat_t *
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__kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
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const char *ks_class, uchar_t ks_type, uint_t ks_ndata,
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uchar_t ks_flags)
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{
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kstat_t *ksp;
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ASSERT(ks_module);
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ASSERT(ks_instance == 0);
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ASSERT(ks_name);
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ASSERT(!(ks_flags & KSTAT_FLAG_UNSUPPORTED));
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if ((ks_type == KSTAT_TYPE_INTR) || (ks_type == KSTAT_TYPE_IO))
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ASSERT(ks_ndata == 1);
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ksp = kmem_zalloc(sizeof(*ksp), KM_SLEEP);
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if (ksp == NULL)
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return ksp;
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spin_lock(&kstat_lock);
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ksp->ks_kid = kstat_id;
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kstat_id++;
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spin_unlock(&kstat_lock);
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ksp->ks_magic = KS_MAGIC;
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spin_lock_init(&ksp->ks_lock);
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INIT_LIST_HEAD(&ksp->ks_list);
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ksp->ks_crtime = gethrtime();
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ksp->ks_snaptime = ksp->ks_crtime;
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strncpy(ksp->ks_module, ks_module, KSTAT_STRLEN);
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ksp->ks_instance = ks_instance;
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strncpy(ksp->ks_name, ks_name, KSTAT_STRLEN);
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strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
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ksp->ks_type = ks_type;
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ksp->ks_flags = ks_flags;
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switch (ksp->ks_type) {
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case KSTAT_TYPE_RAW:
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ksp->ks_ndata = 1;
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ksp->ks_data_size = ks_ndata;
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break;
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case KSTAT_TYPE_NAMED:
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ksp->ks_ndata = ks_ndata;
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ksp->ks_data_size = ks_ndata * sizeof(kstat_named_t);
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break;
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case KSTAT_TYPE_INTR:
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ksp->ks_ndata = ks_ndata;
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ksp->ks_data_size = ks_ndata * sizeof(kstat_intr_t);
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break;
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case KSTAT_TYPE_IO:
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ksp->ks_ndata = ks_ndata;
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ksp->ks_data_size = ks_ndata * sizeof(kstat_io_t);
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break;
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case KSTAT_TYPE_TIMER:
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ksp->ks_ndata = ks_ndata;
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ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
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break;
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default:
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SBUG(); /* Unreachable */
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}
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if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL) {
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ksp->ks_data = NULL;
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} else {
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ksp->ks_data = kmem_alloc(ksp->ks_data_size, KM_SLEEP);
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if (ksp->ks_data == NULL) {
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kmem_free(ksp, sizeof(*ksp));
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ksp = NULL;
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}
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}
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return ksp;
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}
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EXPORT_SYMBOL(__kstat_create);
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void
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__kstat_install(kstat_t *ksp)
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{
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struct proc_dir_entry *de_module, *de_name;
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kstat_t *tmp;
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int rc = 0;
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ENTRY;
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spin_lock(&kstat_lock);
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/* Item may only be added to the list once */
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list_for_each_entry(tmp, &kstat_list, ks_list) {
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if (tmp == ksp) {
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spin_unlock(&kstat_lock);
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GOTO(out, rc = -EEXIST);
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}
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}
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list_add_tail(&ksp->ks_list, &kstat_list);
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spin_unlock(&kstat_lock);
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de_module = proc_dir_entry_find(proc_sys_spl_kstat, ksp->ks_module);
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if (de_module == NULL) {
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de_module = proc_mkdir(ksp->ks_module, proc_sys_spl_kstat);
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if (de_module == NULL)
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GOTO(out, rc = -EUNATCH);
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}
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de_name = create_proc_entry(ksp->ks_name, 0444, de_module);
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if (de_name == NULL)
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GOTO(out, rc = -EUNATCH);
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spin_lock(&ksp->ks_lock);
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ksp->ks_proc = de_name;
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de_name->proc_fops = &proc_kstat_operations;
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de_name->data = (void *)ksp;
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spin_unlock(&ksp->ks_lock);
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out:
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if (rc) {
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spin_lock(&kstat_lock);
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list_del_init(&ksp->ks_list);
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spin_unlock(&kstat_lock);
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}
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EXIT;
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}
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EXPORT_SYMBOL(__kstat_install);
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void
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__kstat_delete(kstat_t *ksp)
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{
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struct proc_dir_entry *de_module;
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spin_lock(&kstat_lock);
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list_del_init(&ksp->ks_list);
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spin_unlock(&kstat_lock);
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if (ksp->ks_proc) {
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de_module = ksp->ks_proc->parent;
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remove_proc_entry(ksp->ks_name, de_module);
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/* Remove top level module directory if it's empty */
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if (proc_dir_entries(de_module) == 0)
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remove_proc_entry(de_module->name, de_module->parent);
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}
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if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
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kmem_free(ksp->ks_data, ksp->ks_data_size);
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kmem_free(ksp, sizeof(*ksp));
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return;
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}
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EXPORT_SYMBOL(__kstat_delete);
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#endif /* DEBUG_KSTAT */
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int
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kstat_init(void)
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{
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ENTRY;
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#ifdef DEBUG_KSTAT
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spin_lock_init(&kstat_lock);
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INIT_LIST_HEAD(&kstat_list);
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kstat_id = 0;
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#endif /* DEBUG_KSTAT */
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RETURN(0);
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}
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void
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kstat_fini(void)
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{
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ENTRY;
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#ifdef DEBUG_KSTAT
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ASSERT(list_empty(&kstat_list));
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#endif /* DEBUG_KSTAT */
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EXIT;
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}
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