snapraid/cmdline/dry.c

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2019-01-07 14:06:15 +01:00
/*
* Copyright (C) 2011 Andrea Mazzoleni
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "portable.h"
#include "util.h"
#include "elem.h"
#include "state.h"
#include "parity.h"
#include "handle.h"
#include "io.h"
#include "raid/raid.h"
/****************************************************************************/
/* dry */
static void dry_data_reader(struct snapraid_worker* worker, struct snapraid_task* task)
{
struct snapraid_io* io = worker->io;
struct snapraid_state* state = io->state;
struct snapraid_handle* handle = worker->handle;
struct snapraid_disk* disk = handle->disk;
block_off_t blockcur = task->position;
unsigned char* buffer = task->buffer;
int ret;
char esc_buffer[ESC_MAX];
/* if the disk position is not used */
if (!disk) {
/* use an empty block */
memset(buffer, 0, state->block_size);
task->state = TASK_STATE_DONE;
return;
}
/* get the block */
task->block = fs_par2block_find(disk, blockcur);
/* if the block is not used */
if (!block_has_file(task->block)) {
/* use an empty block */
memset(buffer, 0, state->block_size);
task->state = TASK_STATE_DONE;
return;
}
/* get the file of this block */
task->file = fs_par2file_get(disk, blockcur, &task->file_pos);
/* if the file is different than the current one, close it */
if (handle->file != 0 && handle->file != task->file) {
/* keep a pointer at the file we are going to close for error reporting */
struct snapraid_file* report = handle->file;
ret = handle_close(handle);
if (ret == -1) {
/* LCOV_EXCL_START */
/* This one is really an unexpected error, because we are only reading */
/* and closing a descriptor should never fail */
if (errno == EIO) {
log_tag("error:%u:%s:%s: Close EIO error. %s\n", blockcur, disk->name, esc_tag(report->sub, esc_buffer), strerror(errno));
log_fatal("DANGER! Unexpected input/output close error in a data disk, it isn't possible to dry.\n");
log_fatal("Ensure that disk '%s' is sane and that file '%s' can be accessed.\n", disk->dir, handle->path);
log_fatal("Stopping at block %u\n", blockcur);
task->state = TASK_STATE_IOERROR;
return;
}
log_tag("error:%u:%s:%s: Close error. %s\n", blockcur, disk->name, esc_tag(report->sub, esc_buffer), strerror(errno));
log_fatal("WARNING! Unexpected close error in a data disk, it isn't possible to dry.\n");
log_fatal("Ensure that file '%s' can be accessed.\n", handle->path);
log_fatal("Stopping at block %u\n", blockcur);
task->state = TASK_STATE_ERROR;
return;
/* LCOV_EXCL_STOP */
}
}
ret = handle_open(handle, task->file, state->file_mode, log_error, 0);
if (ret == -1) {
if (errno == EIO) {
/* LCOV_EXCL_START */
log_tag("error:%u:%s:%s: Open EIO error. %s\n", blockcur, disk->name, esc_tag(task->file->sub, esc_buffer), strerror(errno));
log_fatal("DANGER! Unexpected input/output open error in a data disk, it isn't possible to dry.\n");
log_fatal("Ensure that disk '%s' is sane and that file '%s' can be accessed.\n", disk->dir, handle->path);
log_fatal("Stopping at block %u\n", blockcur);
task->state = TASK_STATE_IOERROR;
return;
/* LCOV_EXCL_STOP */
}
log_tag("error:%u:%s:%s: Open error. %s\n", blockcur, disk->name, esc_tag(task->file->sub, esc_buffer), strerror(errno));
task->state = TASK_STATE_ERROR_CONTINUE;
return;
}
task->read_size = handle_read(handle, task->file_pos, buffer, state->block_size, log_error, 0);
if (task->read_size == -1) {
if (errno == EIO) {
log_tag("error:%u:%s:%s: Read EIO error at position %u. %s\n", blockcur, disk->name, esc_tag(task->file->sub, esc_buffer), task->file_pos, strerror(errno));
log_error("Input/Output error in file '%s' at position '%u'\n", handle->path, task->file_pos);
task->state = TASK_STATE_IOERROR_CONTINUE;
return;
}
log_tag("error:%u:%s:%s: Read error at position %u. %s\n", blockcur, disk->name, esc_tag(task->file->sub, esc_buffer), task->file_pos, strerror(errno));
task->state = TASK_STATE_ERROR_CONTINUE;
return;
}
/* store the path of the opened file */
pathcpy(task->path, sizeof(task->path), handle->path);
task->state = TASK_STATE_DONE;
}
static void dry_parity_reader(struct snapraid_worker* worker, struct snapraid_task* task)
{
struct snapraid_io* io = worker->io;
struct snapraid_state* state = io->state;
struct snapraid_parity_handle* parity_handle = worker->parity_handle;
unsigned level = parity_handle->level;
block_off_t blockcur = task->position;
unsigned char* buffer = task->buffer;
int ret;
/* read the parity */
ret = parity_read(parity_handle, blockcur, buffer, state->block_size, log_error);
if (ret == -1) {
if (errno == EIO) {
log_tag("parity_error:%u:%s: Read EIO error. %s\n", blockcur, lev_config_name(level), strerror(errno));
log_error("Input/Output error in parity '%s' at position '%u'\n", lev_config_name(level), blockcur);
task->state = TASK_STATE_IOERROR_CONTINUE;
return;
}
log_tag("parity_error:%u:%s: Read error. %s\n", blockcur, lev_config_name(level), strerror(errno));
task->state = TASK_STATE_ERROR_CONTINUE;
return;
}
task->state = TASK_STATE_DONE;
}
static int state_dry_process(struct snapraid_state* state, struct snapraid_parity_handle* parity_handle, block_off_t blockstart, block_off_t blockmax)
{
struct snapraid_io io;
struct snapraid_handle* handle;
unsigned diskmax;
block_off_t blockcur;
unsigned j;
unsigned buffermax;
int ret;
data_off_t countsize;
block_off_t countpos;
block_off_t countmax;
unsigned error;
unsigned io_error;
unsigned l;
unsigned* waiting_map;
unsigned waiting_mac;
char esc_buffer[ESC_MAX];
handle = handle_mapping(state, &diskmax);
/* we need 1 * data + 2 * parity */
buffermax = diskmax + 2 * state->level;
/* initialize the io threads */
io_init(&io, state, state->opt.io_cache, buffermax, dry_data_reader, handle, diskmax, dry_parity_reader, 0, parity_handle, state->level);
/* possibly waiting disks */
waiting_mac = diskmax > RAID_PARITY_MAX ? diskmax : RAID_PARITY_MAX;
waiting_map = malloc_nofail(waiting_mac * sizeof(unsigned));
error = 0;
io_error = 0;
/* drop until now */
state_usage_waste(state);
countmax = blockmax - blockstart;
countsize = 0;
countpos = 0;
/* start all the worker threads */
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io_start(&io, blockstart, blockmax, 0);
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state_progress_begin(state, blockstart, blockmax, countmax);
while (1) {
void** buffer;
/* go to the next block */
blockcur = io_read_next(&io, &buffer);
if (blockcur >= blockmax)
break;
/* until now is scheduling */
state_usage_sched(state);
/* for each disk, process the block */
for (j = 0; j < diskmax; ++j) {
struct snapraid_task* task;
int read_size;
struct snapraid_block* block;
struct snapraid_disk* disk;
unsigned diskcur;
/* until now is misc */
state_usage_misc(state);
/* get the next task */
task = io_data_read(&io, &diskcur, waiting_map, &waiting_mac);
/* until now is disk */
state_usage_disk(state, handle, waiting_map, waiting_mac);
/* get the task results */
disk = task->disk;
block = task->block;
read_size = task->read_size;
/* if the disk position is not used */
if (!disk)
continue;
state_usage_file(state, disk, task->file);
/* if the block is not used */
if (!block_has_file(block))
continue;
/* handle error conditions */
if (task->state == TASK_STATE_IOERROR) {
/* LCOV_EXCL_START */
++io_error;
goto bail;
/* LCOV_EXCL_STOP */
}
if (task->state == TASK_STATE_ERROR) {
/* LCOV_EXCL_START */
++error;
goto bail;
/* LCOV_EXCL_STOP */
}
if (task->state == TASK_STATE_ERROR_CONTINUE) {
++error;
continue;
}
if (task->state == TASK_STATE_IOERROR_CONTINUE) {
++io_error;
if (io_error >= state->opt.io_error_limit) {
/* LCOV_EXCL_START */
log_fatal("DANGER! Too many input/output read error in a data disk, it isn't possible to scrub.\n");
log_fatal("Ensure that disk '%s' is sane and that file '%s' can be accessed.\n", disk->dir, task->path);
log_fatal("Stopping at block %u\n", blockcur);
goto bail;
/* LCOV_EXCL_STOP */
}
/* otherwise continue */
continue;
}
if (task->state != TASK_STATE_DONE) {
/* LCOV_EXCL_START */
log_fatal("Internal inconsistency in task state\n");
os_abort();
/* LCOV_EXCL_STOP */
}
countsize += read_size;
}
/* until now is misc */
state_usage_misc(state);
/* read the parity */
for (l = 0; l < state->level; ++l) {
struct snapraid_task* task;
unsigned levcur;
task = io_parity_read(&io, &levcur, waiting_map, &waiting_mac);
/* until now is parity */
state_usage_parity(state, waiting_map, waiting_mac);
/* handle error conditions */
if (task->state == TASK_STATE_IOERROR) {
/* LCOV_EXCL_START */
++io_error;
goto bail;
/* LCOV_EXCL_STOP */
}
if (task->state == TASK_STATE_ERROR) {
/* LCOV_EXCL_START */
++error;
goto bail;
/* LCOV_EXCL_STOP */
}
if (task->state == TASK_STATE_ERROR_CONTINUE) {
++error;
continue;
}
if (task->state == TASK_STATE_IOERROR_CONTINUE) {
++io_error;
if (io_error >= state->opt.io_error_limit) {
/* LCOV_EXCL_START */
log_fatal("DANGER! Too many input/output read error in the %s disk, it isn't possible to scrub.\n", lev_name(levcur));
log_fatal("Ensure that disk '%s' is sane and can be read.\n", lev_config_name(levcur));
log_fatal("Stopping at block %u\n", blockcur);
goto bail;
/* LCOV_EXCL_STOP */
}
continue;
}
if (task->state != TASK_STATE_DONE) {
/* LCOV_EXCL_START */
log_fatal("Internal inconsistency in task state\n");
os_abort();
/* LCOV_EXCL_STOP */
}
}
/* count the number of processed block */
++countpos;
/* progress */
if (state_progress(state, &io, blockcur, countpos, countmax, countsize)) {
/* LCOV_EXCL_START */
break;
/* LCOV_EXCL_STOP */
}
}
state_progress_end(state, countpos, countmax, countsize);
state_usage_print(state);
bail:
/* stop all the worker threads */
io_stop(&io);
for (j = 0; j < diskmax; ++j) {
struct snapraid_file* file = handle[j].file;
struct snapraid_disk* disk = handle[j].disk;
ret = handle_close(&handle[j]);
if (ret == -1) {
/* LCOV_EXCL_START */
log_tag("error:%u:%s:%s: Close error. %s\n", blockmax, disk->name, esc_tag(file->sub, esc_buffer), strerror(errno));
log_fatal("DANGER! Unexpected close error in a data disk.\n");
++error;
/* continue, as we are already exiting */
/* LCOV_EXCL_STOP */
}
}
if (error || io_error) {
msg_status("\n");
msg_status("%8u file errors\n", error);
msg_status("%8u io errors\n", io_error);
} else {
msg_status("Everything OK\n");
}
if (error)
log_fatal("DANGER! Unexpected errors!\n");
if (io_error)
log_fatal("DANGER! Unexpected input/output errors!\n");
free(handle);
free(waiting_map);
io_done(&io);
if (error + io_error != 0)
return -1;
return 0;
}
void state_dry(struct snapraid_state* state, block_off_t blockstart, block_off_t blockcount)
{
block_off_t blockmax;
int ret;
struct snapraid_parity_handle parity_handle[LEV_MAX];
unsigned error;
unsigned l;
msg_progress("Drying...\n");
blockmax = parity_allocated_size(state);
if (blockstart > blockmax) {
/* LCOV_EXCL_START */
log_fatal("Error in the specified starting block %u. It's bigger than the parity size %u.\n", blockstart, blockmax);
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
/* adjust the number of block to process */
if (blockcount != 0 && blockstart + blockcount < blockmax) {
blockmax = blockstart + blockcount;
}
/* open the file for reading */
/* it may fail if the file doesn't exist, in this case we continue to dry the files */
for (l = 0; l < state->level; ++l) {
ret = parity_open(&parity_handle[l], &state->parity[l], l, state->file_mode, state->block_size, state->opt.parity_limit_size);
if (ret == -1) {
/* LCOV_EXCL_START */
log_fatal("WARNING! Without an accessible %s file, it isn't possible to dry.\n", lev_name(l));
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
}
error = 0;
/* skip degenerated cases of empty parity, or skipping all */
if (blockstart < blockmax) {
ret = state_dry_process(state, parity_handle, blockstart, blockmax);
if (ret == -1) {
/* LCOV_EXCL_START */
++error;
/* continue, as we are already exiting */
/* LCOV_EXCL_STOP */
}
}
/* try to close only if opened */
for (l = 0; l < state->level; ++l) {
ret = parity_close(&parity_handle[l]);
if (ret == -1) {
/* LCOV_EXCL_START */
++error;
/* continue, as we are already exiting */
/* LCOV_EXCL_STOP */
}
}
/* abort if required */
if (error != 0) {
/* LCOV_EXCL_START */
exit(EXIT_FAILURE);
/* LCOV_EXCL_STOP */
}
}