mirror of
git://sourceware.org/git/lvm2.git
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286 lines
8.0 KiB
C
286 lines
8.0 KiB
C
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/*
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* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "lvm2cmd.h"
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#include "errors.h"
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#include "libdevmapper-event.h"
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#include "dmeventd_lvm.h"
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#include "lvm-string.h"
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#include <sys/wait.h>
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#include <syslog.h> /* FIXME Replace syslog with multilog */
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/* FIXME Missing openlog? */
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/* First warning when thin is 80% full. */
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#define WARNING_THRESH 80
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/* Run a check every 5%. */
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#define CHECK_STEP 5
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/* Do not bother checking thins less than 50% full. */
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#define CHECK_MINIMUM 50
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#define UMOUNT_COMMAND "/bin/umount"
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#define THIN_DEBUG 0
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struct dso_state {
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struct dm_pool *mem;
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int meta_percent_check;
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int data_percent_check;
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uint64_t known_meta_size;
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uint64_t known_data_size;
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char *vg, *lv, *layer;
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char cmd_str[1024];
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};
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static int _extend(struct dso_state *state)
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{
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#if THIN_DEBUG
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syslog(LOG_INFO, "dmeventd executes: %s.", state->cmd_str);
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#endif
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return (dmeventd_lvm2_run(state->cmd_str) == ECMD_PROCESSED);
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}
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#if 0
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static int _run(const char *cmd, ...)
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{
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va_list ap;
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int argc = 1; /* for argv[0], i.e. cmd */
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int i = 0;
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const char **argv;
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pid_t pid = fork();
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int status;
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if (pid == 0) { /* child */
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va_start(ap, cmd);
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while (va_arg(ap, const char *))
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++argc;
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va_end(ap);
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/* + 1 for the terminating NULL */
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argv = alloca(sizeof(const char *) * (argc + 1));
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argv[0] = cmd;
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va_start(ap, cmd);
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while ((argv[++i] = va_arg(ap, const char *)));
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va_end(ap);
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execvp(cmd, (char **)argv);
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syslog(LOG_ERR, "Failed to execute %s: %s.\n", cmd, strerror(errno));
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exit(127);
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}
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if (pid > 0) { /* parent */
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if (waitpid(pid, &status, 0) != pid)
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return 0; /* waitpid failed */
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if (!WIFEXITED(status) || WEXITSTATUS(status))
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return 0; /* the child failed */
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}
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if (pid < 0)
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return 0; /* fork failed */
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return 1; /* all good */
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}
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/* FIXME: all thin pool users needs to be here */
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static void _umount(const char *device, int major, int minor)
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{
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FILE *mounts;
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char buffer[4096];
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char *words[3];
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struct stat st;
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if (!(mounts = fopen("/proc/mounts", "r"))) {
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syslog(LOG_ERR, "Could not read /proc/mounts. Not umounting %s.\n", device);
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return;
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}
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while (!feof(mounts)) {
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/* read a line of /proc/mounts */
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if (!fgets(buffer, sizeof(buffer), mounts))
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break; /* eof, likely */
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/* words[0] is the mount point and words[1] is the device path */
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dm_split_words(buffer, 3, 0, words);
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/* find the major/minor of the device */
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if (stat(words[0], &st))
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continue; /* can't stat, skip this one */
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if (S_ISBLK(st.st_mode) &&
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(int) major(st.st_rdev) == major &&
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(int) minor(st.st_rdev) == minor) {
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syslog(LOG_ERR, "Unmounting invalid thin %s from %s.\n", device, words[1]);
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if (!_run(UMOUNT_COMMAND, "-fl", words[1], NULL))
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syslog(LOG_ERR, "Failed to umount thin %s from %s: %s.\n",
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device, words[1], strerror(errno));
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}
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}
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if (fclose(mounts))
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syslog(LOG_ERR, "Failed to close /proc/mounts.\n");
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}
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#endif
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void process_event(struct dm_task *dmt,
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enum dm_event_mask event __attribute__((unused)),
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void **private)
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{
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const char *device = dm_task_get_name(dmt);
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int percent;
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struct dso_state *state = *private;
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struct dm_status_thin_pool *tps;
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void *next = NULL;
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uint64_t start, length;
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char *target_type = NULL;
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char *params;
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#if 0
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/* No longer monitoring, waiting for remove */
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if (!state->meta_percent_check && !state->data_percent_check)
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return;
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#endif
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dmeventd_lvm2_lock();
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dm_get_next_target(dmt, next, &start, &length, &target_type, ¶ms);
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if (!target_type || (strcmp(target_type, "thin-pool") != 0)) {
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syslog(LOG_ERR, "Invalid targe type.\n");
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goto out;
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}
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if (!dm_get_status_thin_pool(state->mem, params, &tps)) {
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syslog(LOG_ERR, "Failed to parse status.\n");
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#if 0
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/* FIXME hmm what we should do? */
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struct dm_info info;
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if (dm_task_get_info(dmt, &info)) {
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dmeventd_lvm2_unlock();
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_umount(device, info.major, info.minor);
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} /* else; too bad, but this is best-effort thing... */
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#endif
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goto out;
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}
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#if THIN_DEBUG
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syslog(LOG_INFO, "%p: Got status %" PRIu64 " / %" PRIu64
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" %" PRIu64 " / %" PRIu64 ".\n", state,
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tps->used_meta_blocks, tps->total_meta_blocks,
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tps->used_data_blocks, tps->total_data_blocks);
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#endif
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/* Thin pool size had changed. Clear the threshold. */
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if (state->known_meta_size != tps->total_meta_blocks) {
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state->meta_percent_check = CHECK_MINIMUM;
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state->known_meta_size = tps->total_meta_blocks;
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}
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if (state->known_data_size != tps->total_data_blocks) {
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state->data_percent_check = CHECK_MINIMUM;
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state->known_data_size = tps->total_data_blocks;
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}
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percent = 100 * tps->used_meta_blocks / tps->total_meta_blocks;
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if (percent >= state->meta_percent_check) {
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/*
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* Usage has raised more than CHECK_STEP since the last
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* time. Run actions.
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*/
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state->meta_percent_check = (percent / CHECK_STEP) * CHECK_STEP + CHECK_STEP;
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/* FIXME: extension of metadata needs to be written! */
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if (percent >= WARNING_THRESH) /* Print a warning to syslog. */
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syslog(LOG_WARNING, "Thin metadata %s is now %i%% full.\n",
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device, percent);
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/* Try to extend the metadata, in accord with user-set policies */
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if (!_extend(state))
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syslog(LOG_ERR, "Failed to extend thin metadata %s.\n",
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device);
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/* FIXME: hmm READ-ONLY switch should happen in error path */
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}
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percent = 100 * tps->used_data_blocks / tps->total_data_blocks;
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if (percent >= state->data_percent_check) {
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/*
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* Usage has raised more than CHECK_STEP since
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* the last time. Run actions.
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*/
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state->data_percent_check = (percent / CHECK_STEP) * CHECK_STEP + CHECK_STEP;
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if (percent >= WARNING_THRESH) /* Print a warning to syslog. */
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syslog(LOG_WARNING, "Thin %s is now %i%% full.\n", device, percent);
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/* Try to extend the thin data, in accord with user-set policies */
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if (!_extend(state))
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syslog(LOG_ERR, "Failed to extend thin %s.\n", device);
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/* FIXME: hmm READ-ONLY switch should happen in error path */
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}
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out:
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if (tps)
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dm_pool_free(state->mem, tps);
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dmeventd_lvm2_unlock();
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}
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int register_device(const char *device,
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const char *uuid __attribute__((unused)),
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int major __attribute__((unused)),
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int minor __attribute__((unused)),
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void **private)
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{
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struct dm_pool *statemem = NULL;
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struct dso_state *state;
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if (!dmeventd_lvm2_init() ||
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!(statemem = dm_pool_create("thin_pool_state", 2048)) ||
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!(state = dm_pool_zalloc(statemem, sizeof(*state))) ||
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!dm_split_lvm_name(statemem, device, &state->vg, &state->lv,
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&state->layer) ||
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(dm_snprintf(state->cmd_str, sizeof(state->cmd_str),
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"lvextend --use-policies %s/%s", state->vg, state->lv) < 0)) {
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syslog(LOG_ERR, "Failed to monitor thin %s.\n", device);
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if (statemem)
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dm_pool_destroy(statemem);
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return 0;
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}
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state->mem = statemem;
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state->meta_percent_check = CHECK_MINIMUM;
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state->data_percent_check = CHECK_MINIMUM;
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*private = state;
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syslog(LOG_INFO, "Monitoring thin %s.\n", device);
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return 1;
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}
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int unregister_device(const char *device,
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const char *uuid __attribute__((unused)),
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int major __attribute__((unused)),
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int minor __attribute__((unused)),
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void **private)
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{
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struct dso_state *state = *private;
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dm_pool_destroy(state->mem);
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dmeventd_lvm2_exit();
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syslog(LOG_INFO, "No longer monitoring thin %s.\n", device);
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return 1;
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}
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