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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2024, Huawei Technologies Co, Ltd.
*
* Authors: Zhihao Cheng <chengzhihao1@huawei.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include "bitops.h"
#include "kmem.h"
#include "ubifs.h"
#include "defs.h"
#include "debug.h"
#include "key.h"
#include "misc.h"
#include "fsck.ubifs.h"
int ubifs_load_filesystem(struct ubifs_info *c)
{
int err;
size_t sz;
err = init_constants_early(c);
if (err) {
exit_code |= FSCK_ERROR;
return err;
}
err = check_volume_empty(c);
if (err <= 0) {
exit_code |= FSCK_ERROR;
log_err(c, 0, "%s UBI volume!", err < 0 ? "bad" : "empty");
return -EINVAL;
}
if (c->ro_media && !c->ro_mount) {
exit_code |= FSCK_ERROR;
log_err(c, 0, "cannot read-write on read-only media");
return -EROFS;
}
err = -ENOMEM;
c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int),
GFP_KERNEL);
if (!c->bottom_up_buf) {
exit_code |= FSCK_ERROR;
log_err(c, errno, "cannot allocate bottom_up_buf");
goto out_free;
}
c->sbuf = vmalloc(c->leb_size);
if (!c->sbuf) {
exit_code |= FSCK_ERROR;
log_err(c, errno, "cannot allocate sbuf");
goto out_free;
}
if (!c->ro_mount) {
c->ileb_buf = vmalloc(c->leb_size);
if (!c->ileb_buf) {
exit_code |= FSCK_ERROR;
log_err(c, errno, "cannot allocate ileb_buf");
goto out_free;
}
}
c->mounting = 1;
log_out(c, "Read superblock");
err = ubifs_read_superblock(c);
if (err) {
if (test_and_clear_failure_reason_callback(c, FR_DATA_CORRUPTED))
fix_problem(c, SB_CORRUPTED, NULL);
exit_code |= FSCK_ERROR;
goto out_mounting;
}
err = init_constants_sb(c);
if (err) {
exit_code |= FSCK_ERROR;
goto out_mounting;
}
sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2;
c->cbuf = kmalloc(sz, GFP_NOFS);
if (!c->cbuf) {
err = -ENOMEM;
exit_code |= FSCK_ERROR;
log_err(c, errno, "cannot allocate cbuf");
goto out_mounting;
}
err = alloc_wbufs(c);
if (err) {
exit_code |= FSCK_ERROR;
log_err(c, 0, "cannot allocate wbuf");
goto out_mounting;
}
log_out(c, "Read master & init lpt");
err = ubifs_read_master(c);
if (err) {
if (test_and_clear_failure_reason_callback(c, FR_DATA_CORRUPTED)) {
if (fix_problem(c, MST_CORRUPTED, NULL))
FSCK(c)->try_rebuild = true;
} else
exit_code |= FSCK_ERROR;
goto out_master;
}
init_constants_master(c);
if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
ubifs_msg(c, "recovery needed");
c->need_recovery = 1;
}
if (c->need_recovery && !c->ro_mount) {
err = ubifs_recover_inl_heads(c, c->sbuf);
if (err) {
exit_code |= FSCK_ERROR;
goto out_master;
}
}
err = ubifs_lpt_init(c, 1, !c->ro_mount);
if (err) {
exit_code |= FSCK_ERROR;
goto out_master;
}
if (!c->ro_mount && c->space_fixup) {
err = ubifs_fixup_free_space(c);
if (err) {
exit_code |= FSCK_ERROR;
goto out_lpt;
}
}
if (!c->ro_mount && !c->need_recovery) {
/*
* Set the "dirty" flag so that if we reboot uncleanly we
* will notice this immediately on the next mount.
*/
c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
err = ubifs_write_master(c);
if (err) {
exit_code |= FSCK_ERROR;
goto out_lpt;
}
}
if (!c->ro_mount && c->superblock_need_write) {
err = ubifs_write_sb_node(c, c->sup_node);
if (err) {
exit_code |= FSCK_ERROR;
goto out_lpt;
}
c->superblock_need_write = 0;
}
log_out(c, "Replay journal");
err = ubifs_replay_journal(c);
if (err) {
handle_error(c, HAS_DATA_CORRUPTED | HAS_TNC_CORRUPTED);
goto out_journal;
}
/* Calculate 'min_idx_lebs' after journal replay */
c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
log_out(c, "Handle orphan nodes");
err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
if (err) {
handle_error(c, HAS_TNC_CORRUPTED);
goto out_orphans;
}
if (!c->ro_mount) {
int lnum;
/* Check for enough log space */
lnum = c->lhead_lnum + 1;
if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
lnum = UBIFS_LOG_LNUM;
if (lnum == c->ltail_lnum) {
log_out(c, "Consolidate log");
err = ubifs_consolidate_log(c);
if (err) {
handle_error(c, HAS_DATA_CORRUPTED);
goto out_orphans;
}
}
if (c->need_recovery) {
log_out(c, "Recover isize");
err = ubifs_recover_size(c, true);
if (err) {
handle_error(c, HAS_TNC_CORRUPTED);
goto out_orphans;
}
}
} else if (c->need_recovery) {
log_out(c, "Recover isize");
err = ubifs_recover_size(c, false);
if (err) {
handle_error(c, HAS_TNC_CORRUPTED);
goto out_orphans;
}
}
c->mounting = 0;
return 0;
out_orphans:
free_orphans(c);
out_journal:
destroy_journal(c);
out_lpt:
ubifs_lpt_free(c, 0);
out_master:
c->max_sqnum = 0;
c->highest_inum = 0;
c->calc_idx_sz = 0;
kfree(c->mst_node);
kfree(c->rcvrd_mst_node);
free_wbufs(c);
out_mounting:
c->mounting = 0;
out_free:
kfree(c->cbuf);
kfree(c->ileb_buf);
kfree(c->sbuf);
kfree(c->bottom_up_buf);
kfree(c->sup_node);
return err;
}
void ubifs_destroy_filesystem(struct ubifs_info *c)
{
destroy_journal(c);
free_wbufs(c);
free_orphans(c);
ubifs_lpt_free(c, 0);
c->max_sqnum = 0;
c->highest_inum = 0;
c->calc_idx_sz = 0;
kfree(c->cbuf);
kfree(c->rcvrd_mst_node);
kfree(c->mst_node);
kfree(c->ileb_buf);
kfree(c->sbuf);
kfree(c->bottom_up_buf);
kfree(c->sup_node);
}
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