forked from Mirrors/btrfs-progs
btrfs-progs: Error handling in scrub_progress_cycle() thread
consolidate error handling to ensure that peer_fd is closed on error paths. Add a couple comments to the error handling after the thread is complete. Note that scrub_progress_cycle returns negative errnos on any error. Signed-off-by: Eric Sandeen <sandeen@redhat.com>master
parent
6626354fdf
commit
b79d4a217f
59
cmds-scrub.c
59
cmds-scrub.c
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@ -840,9 +840,11 @@ static void *progress_one_dev(void *ctx)
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return NULL;
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}
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/* nb: returns a negative errno via ERR_PTR */
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static void *scrub_progress_cycle(void *ctx)
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{
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int ret;
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int perr = 0; /* positive / pthread error returns */
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int old;
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int i;
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char fsid[37];
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@ -867,9 +869,9 @@ static void *scrub_progress_cycle(void *ctx)
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struct sockaddr_un peer;
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socklen_t peer_size = sizeof(peer);
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ret = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
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if (ret)
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return ERR_PTR(-ret);
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perr = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
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if (perr)
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goto out;
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uuid_unparse(spc->fi->fsid, fsid);
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@ -890,8 +892,10 @@ static void *scrub_progress_cycle(void *ctx)
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while (1) {
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ret = poll(&accept_poll_fd, 1, 5 * 1000);
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if (ret == -1)
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return ERR_PTR(-errno);
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if (ret == -1) {
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ret = -errno;
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goto out;
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}
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if (ret)
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peer_fd = accept(spc->prg_fd, (struct sockaddr *)&peer,
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&peer_size);
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@ -909,42 +913,46 @@ static void *scrub_progress_cycle(void *ctx)
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if (!sp->ret)
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continue;
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if (sp->ioctl_errno != ENOTCONN &&
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sp->ioctl_errno != ENODEV)
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return ERR_PTR(-sp->ioctl_errno);
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sp->ioctl_errno != ENODEV) {
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ret = -sp->ioctl_errno;
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goto out;
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}
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/*
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* scrub finished or device removed, check the
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* finished flag. if unset, just use the last
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* result we got for the current write and go
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* on. flag should be set on next cycle, then.
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*/
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ret = pthread_mutex_lock(&sp_shared->progress_mutex);
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if (ret)
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return ERR_PTR(-ret);
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perr = pthread_mutex_lock(&sp_shared->progress_mutex);
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if (perr)
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goto out;
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if (!sp_shared->stats.finished) {
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ret = pthread_mutex_unlock(
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perr = pthread_mutex_unlock(
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&sp_shared->progress_mutex);
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if (ret)
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return ERR_PTR(-ret);
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if (perr)
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goto out;
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memcpy(sp, sp_last, sizeof(*sp));
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continue;
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}
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ret = pthread_mutex_unlock(&sp_shared->progress_mutex);
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if (ret)
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return ERR_PTR(-ret);
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perr = pthread_mutex_unlock(&sp_shared->progress_mutex);
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if (perr)
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goto out;
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memcpy(sp, sp_shared, sizeof(*sp));
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memcpy(sp_last, sp_shared, sizeof(*sp));
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}
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if (peer_fd != -1) {
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write_poll_fd.fd = peer_fd;
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ret = poll(&write_poll_fd, 1, 0);
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if (ret == -1)
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return ERR_PTR(-errno);
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if (ret == -1) {
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ret = -errno;
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goto out;
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}
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if (ret) {
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ret = scrub_write_file(
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peer_fd, fsid,
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&spc->progress[this * ndev], ndev);
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if (ret)
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return ERR_PTR(ret);
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goto out;
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}
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close(peer_fd);
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peer_fd = -1;
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@ -954,8 +962,14 @@ static void *scrub_progress_cycle(void *ctx)
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ret = scrub_write_progress(spc->write_mutex, fsid,
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&spc->progress[this * ndev], ndev);
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if (ret)
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return ERR_PTR(ret);
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goto out;
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}
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out:
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if (peer_fd != -1)
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close(peer_fd);
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if (perr)
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ret = -perr;
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return ERR_PTR(ret);
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}
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static struct scrub_file_record *last_dev_scrub(
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@ -1373,11 +1387,14 @@ static int scrub_start(int argc, char **argv, int resume)
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ret = pthread_cancel(t_prog);
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if (!ret)
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ret = pthread_join(t_prog, &terr);
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/* check for errors from the handling of the progress thread */
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if (do_print && ret) {
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fprintf(stderr, "ERROR: progress thead handling failed: %s\n",
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fprintf(stderr, "ERROR: progress thread handling failed: %s\n",
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strerror(ret));
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}
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/* check for errors returned from the progress thread itself */
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if (do_print && terr && terr != PTHREAD_CANCELED) {
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fprintf(stderr, "ERROR: recording progress "
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"failed: %s\n", strerror(-PTR_ERR(terr)));
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