Viewing: lfsck_engine.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013, 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Author: Fan, Yong <fan.yong@intel.com>
*/
#define DEBUG_SUBSYSTEM S_LFSCK
#include <lu_object.h>
#include <dt_object.h>
#include <lustre_net.h>
#include <lustre_fid.h>
#include <obd_support.h>
#include <lustre_lib.h>
#include <lu_target.h>
#include "lfsck_internal.h"
int lfsck_unpack_ent(struct lu_dirent *ent, __u64 *cookie, __u16 *type)
{
struct luda_type *lt;
int align = sizeof(*lt) - 1;
int len;
fid_le_to_cpu(&ent->lde_fid, &ent->lde_fid);
*cookie = le64_to_cpu(ent->lde_hash);
ent->lde_reclen = le16_to_cpu(ent->lde_reclen);
ent->lde_namelen = le16_to_cpu(ent->lde_namelen);
ent->lde_attrs = le32_to_cpu(ent->lde_attrs);
if (unlikely(!(ent->lde_attrs & LUDA_TYPE)))
return -EINVAL;
len = (ent->lde_namelen + align) & ~align;
lt = (struct luda_type *)(ent->lde_name + len);
*type = le16_to_cpu(lt->lt_type);
/* Make sure the name is terminated with '\0'. The data (object type)
* after ent::lde_name maybe broken, but we have stored such data in
* the output parameter @type as above.
*/
ent->lde_name[ent->lde_namelen] = '\0';
return 0;
}
static void lfsck_di_oit_put(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
const struct dt_it_ops *iops;
struct dt_it *di;
spin_lock(&lfsck->li_lock);
iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
di = lfsck->li_di_oit;
lfsck->li_di_oit = NULL;
spin_unlock(&lfsck->li_lock);
iops->put(env, di);
}
static void lfsck_di_dir_put(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
const struct dt_it_ops *iops;
struct dt_it *di;
spin_lock(&lfsck->li_lock);
iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
di = lfsck->li_di_dir;
lfsck->li_di_dir = NULL;
lfsck->li_cookie_dir = 0;
spin_unlock(&lfsck->li_lock);
iops->put(env, di);
}
/**
* lfsck_needs_scan_dir() - Check whether needs to scan the directory or not.
* @env: pointer to the thread context
* @lfsck: pointer to the lfsck instance
* @obj: pointer to the object to be checked
*
* 1) If we are not doing namespace LFSCK, or the given @obj is not directory,
* then needs not to scan the @obj. Otherwise,
* 2) Global /ROOT needs to be scanned, backend root needs not to be scanned.
* 3) If the @obj is neither IGIF nor normal FID (including .lustre and its
* sub-directories that have been scanned when the LFSCK engine start),
* then needs not to be scanned.
* 4) If it is a remote object, then scanning the object will be done on the
* MDT on which the object really resides.
* 5) If the local object has normal FID, then needs to be scanned. Otherwise,
* 6) If the object has linkEA, then needs to be scanned. Otherwise,
* 7) If none of the previous conditions are true, we need to check the parent
* directories whether this subdirectory is in a tree that should be scanned.
* Set the parent as current @obj, repeat 2)-7).
*
* Return:
* * %positive number if the directory needs to be scanned
* * %0 if the directory needs NOT to be scanned
* * %negative error number on failure
*/
static int lfsck_needs_scan_dir(const struct lu_env *env,
struct lfsck_instance *lfsck,
struct dt_object *obj)
{
struct lfsck_thread_info *info = lfsck_env_info(env);
struct lu_fid *fid = &info->lti_fid;
struct lu_seq_range *range = &info->lti_range;
struct lu_attr *la = &info->lti_la;
struct seq_server_site *ss = lfsck_dev_site(lfsck);
__u32 idx = lfsck_dev_idx(lfsck);
int depth = 0;
int rc = 0;
if (list_empty(&lfsck->li_list_dir) || !S_ISDIR(lfsck_object_type(obj)))
return 0;
*fid = *lfsck_dto2fid(obj);
rc = dt_attr_get(env, obj, la);
if (unlikely(rc || (la->la_valid & LA_FLAGS &&
la->la_flags & LUSTRE_ORPHAN_FL))) {
/* Orphan directory is empty, does not need scan. */
CDEBUG(D_INFO,
"%s: skip orphan dir "DFID", %llx/%x: rc = %d\n",
lfsck_lfsck2name(lfsck), PFID(fid),
la->la_valid, la->la_flags, rc);
return rc;
}
LASSERT(ss != NULL);
while (1) {
/* Global /ROOT is visible. */
if (unlikely(lu_fid_eq(fid, &lfsck->li_global_root_fid)))
return 1;
/* Backend root is invisible. */
if (unlikely(lu_fid_eq(fid, &lfsck->li_local_root_fid)))
return 0;
if (!fid_is_norm(fid) && !fid_is_igif(fid))
return 0;
fld_range_set_mdt(range);
rc = fld_local_lookup(env, ss->ss_server_fld,
fid_seq(fid), range);
if (rc != 0 || range->lsr_index != idx)
/* Current FID should NOT be for the input parameter
* @obj, because the lfsck_master_oit_engine() has
* filtered out agent object. So current FID is for
* the ancestor of the original input parameter @obj.
* So the ancestor is a remote directory. The input
* parameter @obj is local directory, and should be
* scanned under such case.
*/
return 1;
/* normal FID on this target (locally) must be for the
* client-side visible object.
*/
if (fid_is_norm(fid))
return 1;
/* Only true after "obj = NULL" set below */
if (obj == NULL) {
obj = lfsck_object_find_bottom(env, lfsck, fid);
if (IS_ERR(obj))
return PTR_ERR(obj);
depth++;
if (!dt_object_exists(obj))
GOTO(out, rc = 0);
}
dt_read_lock(env, obj, DT_TGT_CHILD);
if (unlikely(lfsck_is_dead_obj(obj))) {
dt_read_unlock(env, obj);
GOTO(out, rc = 0);
}
rc = dt_xattr_get(env, obj,
lfsck_buf_get(env, NULL, 0), XATTR_NAME_LINK);
dt_read_unlock(env, obj);
if (rc >= 0)
GOTO(out, rc = 1);
if (rc < 0 && rc != -ENODATA)
GOTO(out, rc);
rc = dt_lookup_dir(env, obj, dotdot, fid);
if (depth > 0)
lfsck_object_put(env, obj);
obj = NULL;
if (rc != 0)
return rc;
if (!fid_is_sane(fid))
return 0;
}
out:
if (depth > 0 && obj != NULL)
lfsck_object_put(env, obj);
return rc;
}
static int lfsck_load_stripe_lmv(const struct lu_env *env,
struct lfsck_instance *lfsck,
struct dt_object *obj)
{
struct lmv_mds_md_v1 *lmv = &lfsck_env_info(env)->lti_lmv;
struct lfsck_lmv *llmv;
int rc;
ENTRY;
LASSERT(lfsck->li_obj_dir == NULL);
LASSERT(lfsck->li_lmv == NULL);
rc = lfsck_read_stripe_lmv(env, lfsck, obj, lmv);
if (rc == -ENODATA) {
lfsck->li_obj_dir = lfsck_object_get(obj);
RETURN(0);
}
if (rc < 0)
RETURN(rc);
OBD_ALLOC_PTR(llmv);
if (llmv == NULL)
RETURN(-ENOMEM);
if (lmv->lmv_magic == LMV_MAGIC) {
struct lfsck_slave_lmv_rec *lslr;
__u32 stripes;
llmv->ll_lmv_master = 1;
if (lmv->lmv_stripe_count < 1)
stripes = LFSCK_LMV_DEF_STRIPES;
else if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
stripes = LFSCK_LMV_MAX_STRIPES;
else
stripes = lmv->lmv_stripe_count;
OBD_ALLOC_PTR_ARRAY_LARGE(lslr, stripes);
if (lslr == NULL) {
OBD_FREE_PTR(llmv);
RETURN(-ENOMEM);
}
llmv->ll_stripes_allocated = stripes;
llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
llmv->ll_lslr = lslr;
} else {
llmv->ll_lmv_slave = 1;
}
lfsck->li_obj_dir = lfsck_object_get(obj);
llmv->ll_lmv = *lmv;
atomic_set(&llmv->ll_ref, 1);
lfsck->li_lmv = llmv;
RETURN(0);
}
/* LFSCK wrap functions */
static void lfsck_fail(const struct lu_env *env, struct lfsck_instance *lfsck,
bool new_checked)
{
struct lfsck_component *com;
list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
com->lc_ops->lfsck_fail(env, com, new_checked);
}
}
void lfsck_close_dir(const struct lu_env *env,
struct lfsck_instance *lfsck, int result)
{
struct lfsck_component *com;
ENTRY;
if (lfsck->li_lmv != NULL) {
lfsck->li_lmv->ll_exit_value = result;
if (lfsck->li_obj_dir != NULL) {
list_for_each_entry(com, &lfsck->li_list_dir,
lc_link_dir) {
com->lc_ops->lfsck_close_dir(env, com);
}
}
lfsck_lmv_put(env, lfsck->li_lmv);
lfsck->li_lmv = NULL;
}
if (lfsck->li_di_dir != NULL) {
const struct dt_it_ops *dir_iops;
struct dt_it *dir_di = lfsck->li_di_dir;
LASSERT(lfsck->li_obj_dir != NULL);
dir_iops = &lfsck->li_obj_dir->do_index_ops->dio_it;
lfsck_di_dir_put(env, lfsck);
dir_iops->fini(env, dir_di);
}
if (lfsck->li_obj_dir != NULL) {
struct dt_object *dir_obj = lfsck->li_obj_dir;
lfsck->li_obj_dir = NULL;
lfsck_object_put(env, dir_obj);
}
EXIT;
}
int lfsck_open_dir(const struct lu_env *env,
struct lfsck_instance *lfsck, __u64 cookie)
{
struct dt_object *obj = lfsck->li_obj_dir;
struct dt_it *di = lfsck->li_di_dir;
struct lfsck_component *com;
const struct dt_it_ops *iops;
int rc = 0;
ENTRY;
LASSERT(obj != NULL);
LASSERT(di == NULL);
if (unlikely(!dt_try_as_dir(env, obj, true)))
GOTO(out, rc = -ENOTDIR);
list_for_each_entry(com, &lfsck->li_list_dir, lc_link_dir) {
rc = com->lc_ops->lfsck_open_dir(env, com);
if (rc != 0)
GOTO(out, rc);
}
iops = &obj->do_index_ops->dio_it;
di = iops->init(env, obj, lfsck->li_args_dir);
if (IS_ERR(di))
GOTO(out, rc = PTR_ERR(di));
rc = iops->load(env, di, cookie);
if (rc == -ENODATA)
rc = 1;
else if (rc == 0 || (rc > 0 && cookie > 0))
rc = iops->next(env, di);
else if (rc > 0)
rc = 0;
if (rc != 0) {
iops->put(env, di);
iops->fini(env, di);
} else {
lfsck->li_cookie_dir = iops->store(env, di);
spin_lock(&lfsck->li_lock);
lfsck->li_di_dir = di;
spin_unlock(&lfsck->li_lock);
}
GOTO(out, rc);
out:
if (rc != 0)
lfsck_close_dir(env, lfsck, rc);
return rc;
}
static int lfsck_checkpoint(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
struct lfsck_component *com;
int rc = 0;
int rc1 = 0;
if (likely(ktime_get_seconds() <= lfsck->li_time_next_checkpoint))
return 0;
lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
rc = com->lc_ops->lfsck_checkpoint(env, com, false);
if (rc != 0)
rc1 = rc;
}
lfsck->li_time_last_checkpoint = ktime_get_seconds();
lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
LFSCK_CHECKPOINT_INTERVAL;
return rc1 != 0 ? rc1 : rc;
}
static int lfsck_prep(const struct lu_env *env, struct lfsck_instance *lfsck,
struct lfsck_start_param *lsp)
{
struct dt_object *obj = NULL;
struct lfsck_component *com;
struct lfsck_component *next;
struct lfsck_position *pos = NULL;
const struct dt_it_ops *iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
int rc;
ENTRY;
LASSERT(lfsck->li_obj_dir == NULL);
LASSERT(lfsck->li_di_dir == NULL);
lfsck->li_current_oit_processed = 0;
list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
com->lc_new_checked = 0;
rc = com->lc_ops->lfsck_prep(env, com, lsp);
if (rc != 0)
GOTO(out, rc);
if ((pos == NULL) ||
(!lfsck_pos_is_zero(&com->lc_pos_start) &&
lfsck_pos_is_eq(pos, &com->lc_pos_start) > 0))
pos = &com->lc_pos_start;
}
/* Init otable-based iterator. */
if (pos == NULL) {
rc = iops->load(env, lfsck->li_di_oit, 0);
if (rc > 0 || unlikely(rc == -ENODATA)) {
lfsck->li_oit_over = 1;
rc = 0;
}
GOTO(out, rc);
}
rc = iops->load(env, lfsck->li_di_oit, pos->lp_oit_cookie);
if (rc > 0 || unlikely(rc == -ENODATA))
lfsck->li_oit_over = 1;
else if (rc < 0)
GOTO(out, rc);
if (!lfsck->li_master || fid_is_zero(&pos->lp_dir_parent))
GOTO(out, rc = 0);
/* Find the directory for namespace-based traverse. */
obj = lfsck_object_find_bottom(env, lfsck, &pos->lp_dir_parent);
if (IS_ERR(obj))
RETURN(PTR_ERR(obj));
/* Remote directory will be scanned by the LFSCK instance
* on the MDT where the remote object really resides on.
*/
if (!dt_object_exists(obj) || dt_object_remote(obj) ||
unlikely(!S_ISDIR(lfsck_object_type(obj))))
GOTO(out, rc = 0);
rc = lfsck_load_stripe_lmv(env, lfsck, obj);
if (rc == 0) {
/* For the master MDT-object of a striped directory,
* reset the iteration from the directory beginning.
*/
if (lfsck->li_lmv != NULL && lfsck->li_lmv->ll_lmv_master)
pos->lp_dir_cookie = 0;
rc = lfsck_open_dir(env, lfsck, pos->lp_dir_cookie);
if (rc > 0)
/* The end of the directory. */
rc = 0;
}
GOTO(out, rc);
out:
if (obj != NULL)
lfsck_object_put(env, obj);
if (rc != 0) {
lfsck_close_dir(env, lfsck, rc);
list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
lc_link) {
com->lc_ops->lfsck_post(env, com, rc, true);
}
return rc;
}
rc = 0;
lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, true);
lfsck->li_pos_current = lfsck->li_pos_checkpoint;
list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
rc = com->lc_ops->lfsck_checkpoint(env, com, true);
if (rc != 0)
break;
}
lfsck->li_time_last_checkpoint = ktime_get_seconds();
lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
LFSCK_CHECKPOINT_INTERVAL;
return rc;
}
static int lfsck_exec_oit(const struct lu_env *env,
struct lfsck_instance *lfsck, struct dt_object *obj)
{
struct lfsck_component *com;
int rc;
ENTRY;
LASSERT(lfsck->li_obj_dir == NULL);
list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
rc = com->lc_ops->lfsck_exec_oit(env, com, obj);
if (rc != 0)
RETURN(rc);
}
rc = lfsck_needs_scan_dir(env, lfsck, obj);
if (rc <= 0)
GOTO(out, rc);
rc = lfsck_load_stripe_lmv(env, lfsck, obj);
if (rc == 0)
rc = lfsck_open_dir(env, lfsck, 0);
GOTO(out, rc);
out:
if (rc < 0)
lfsck_fail(env, lfsck, false);
if (rc != 0)
lfsck_close_dir(env, lfsck, rc);
return rc > 0 ? 0 : rc;
}
static int lfsck_exec_dir(const struct lu_env *env,
struct lfsck_instance *lfsck,
struct lfsck_assistant_object *lso,
struct lu_dirent *ent, __u16 type)
{
struct lfsck_component *com;
int rc;
list_for_each_entry(com, &lfsck->li_list_scan, lc_link) {
rc = com->lc_ops->lfsck_exec_dir(env, com, lso, ent, type);
if (rc != 0)
return rc;
}
return 0;
}
static int lfsck_master_dir_engine(const struct lu_env *env,
struct lfsck_instance *lfsck);
static int lfsck_post(const struct lu_env *env, struct lfsck_instance *lfsck,
int result)
{
struct lfsck_component *com;
struct lfsck_component *next;
int rc = result;
lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
lfsck_close_dir(env, lfsck, result);
while (!lfsck_should_stop(lfsck) && rc > 0 &&
!list_empty(&lfsck->li_list_lmv)) {
struct lfsck_lmv_unit *llu;
spin_lock(&lfsck->li_lock);
llu = list_first_entry(&lfsck->li_list_lmv,
struct lfsck_lmv_unit, llu_link);
list_del_init(&llu->llu_link);
spin_unlock(&lfsck->li_lock);
lfsck->li_lmv = &llu->llu_lmv;
lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
rc = lfsck_open_dir(env, lfsck, 0);
if (rc == 0) {
rc = lfsck_master_dir_engine(env, lfsck);
lfsck_close_dir(env, lfsck, result);
}
}
result = rc;
list_for_each_entry_safe(com, next, &lfsck->li_list_scan, lc_link) {
rc = com->lc_ops->lfsck_post(env, com, result, false);
if (rc != 0)
CDEBUG(D_LFSCK,
"%s at the component %u: rc = %d\n",
lfsck_lfsck2name(lfsck), (__u32)com->lc_type,
rc);
}
lfsck->li_time_last_checkpoint = ktime_get_seconds();
lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
LFSCK_CHECKPOINT_INTERVAL;
/* Ignore some component post failure to make other can go ahead. */
return result;
}
static int lfsck_double_scan(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
struct lfsck_component *com;
struct lfsck_component *next;
int rc = 0;
int rc1 = 0;
list_for_each_entry(com, &lfsck->li_list_double_scan, lc_link) {
rc = com->lc_ops->lfsck_double_scan(env, com);
if (rc != 0)
rc1 = rc;
}
wait_var_event(lfsck, atomic_read(&lfsck->li_double_scan_count) == 0 ||
lfsck_should_stop(lfsck));
if (lfsck->li_status != LS_PAUSED &&
lfsck->li_status != LS_CO_PAUSED) {
list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
lc_link) {
spin_lock(&lfsck->li_lock);
list_move_tail(&com->lc_link, &lfsck->li_list_idle);
spin_unlock(&lfsck->li_lock);
}
}
return rc1 != 0 ? rc1 : rc;
}
static void lfsck_quit(const struct lu_env *env, struct lfsck_instance *lfsck)
{
struct lfsck_component *com;
struct lfsck_component *next;
list_for_each_entry_safe(com, next, &lfsck->li_list_scan,
lc_link) {
if (com->lc_ops->lfsck_quit != NULL)
com->lc_ops->lfsck_quit(env, com);
spin_lock(&lfsck->li_lock);
list_del_init(&com->lc_link_dir);
list_move_tail(&com->lc_link, &lfsck->li_list_idle);
spin_unlock(&lfsck->li_lock);
}
list_for_each_entry_safe(com, next, &lfsck->li_list_double_scan,
lc_link) {
if (com->lc_ops->lfsck_quit != NULL)
com->lc_ops->lfsck_quit(env, com);
spin_lock(&lfsck->li_lock);
list_move_tail(&com->lc_link, &lfsck->li_list_idle);
spin_unlock(&lfsck->li_lock);
}
}
/* LFSCK engines */
static int lfsck_master_dir_engine(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
struct lfsck_thread_info *info = lfsck_env_info(env);
struct dt_object *dir = lfsck->li_obj_dir;
const struct dt_it_ops *iops = &dir->do_index_ops->dio_it;
struct dt_it *di = lfsck->li_di_dir;
struct lu_dirent *ent = (struct lu_dirent *)info->lti_key;
struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
struct lfsck_assistant_object *lso = NULL;
int rc = 0;
__u16 type;
ENTRY;
while (rc == 0 && !lfsck_should_stop(lfsck)) {
if (LFSCK_FAIL_TIMEOUT(lfsck, OBD_FAIL_LFSCK_DELAY2,
cfs_fail_val)) {
CDEBUG(D_LFSCK,
"%s: scan dir exit for engine stop, parent "DFID", cookie %#llx\n",
lfsck_lfsck2name(lfsck),
PFID(lfsck_dto2fid(dir)), lfsck->li_cookie_dir);
GOTO(out, rc);
}
lfsck->li_new_scanned++;
rc = iops->rec(env, di, (struct dt_rec *)ent,
lfsck->li_args_dir);
if (rc == 0)
rc = lfsck_unpack_ent(ent, &lfsck->li_cookie_dir,
&type);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: scan dir failed at rec(), parent "DFID", cookie %#llx: rc = %d\n",
lfsck_lfsck2name(lfsck),
PFID(lfsck_dto2fid(dir)),
lfsck->li_cookie_dir, rc);
lfsck_fail(env, lfsck, true);
if (bk->lb_param & LPF_FAILOUT)
GOTO(out, rc);
else
goto checkpoint;
}
if (ent->lde_attrs & LUDA_IGNORE)
goto checkpoint;
/* skip dot entry. */
if (ent->lde_namelen == 1 && ent->lde_name[0] == '.')
goto checkpoint;
if (lso == NULL) {
lso = lfsck_assistant_object_init(env,
lfsck_dto2fid(dir), NULL,
lfsck->li_pos_current.lp_oit_cookie, true);
if (IS_ERR(lso)) {
if (bk->lb_param & LPF_FAILOUT)
RETURN(PTR_ERR(lso));
lso = NULL;
goto checkpoint;
}
}
/* The type in the @ent structure may has been overwritten,
* so we need to pass the @type parameter independently.
*/
rc = lfsck_exec_dir(env, lfsck, lso, ent, type);
if (rc != 0 && bk->lb_param & LPF_FAILOUT)
GOTO(out, rc);
checkpoint:
rc = lfsck_checkpoint(env, lfsck);
if (rc != 0 && bk->lb_param & LPF_FAILOUT)
GOTO(out, rc);
/* Rate control. */
lfsck_control_speed(lfsck);
if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2))
GOTO(out, rc = -EINVAL);
rc = iops->next(env, di);
if (rc < 0)
CDEBUG(D_LFSCK,
"%s dir engine fail to locate next for the directory "DFID": rc = %d\n",
lfsck_lfsck2name(lfsck),
PFID(&lfsck->li_pos_current.lp_dir_parent), rc);
}
if (rc > 0 && !lfsck->li_oit_over)
lfsck_close_dir(env, lfsck, rc);
GOTO(out, rc);
out:
if (lso != NULL)
kref_put(&lso->lso_ref, lfsck_assistant_object_put);
return rc;
}
/**
* lfsck_master_oit_engine() - Object-table based iteration engine.
* @env: pointer to the thread context
* @lfsck: pointer to the lfsck instance
*
* Object-table based iteration is the basic linear engine to scan all the
* objects on current device in turn. For each object, it calls all the
* registered LFSCK component(s)' API to perform related consistency
* verification.
*
* It flushes related LFSCK trace files to disk via making checkpoint
* periodically. Then if the server crashed or the LFSCK is paused, the
* LFSCK can resume from the latest checkpoint.
*
* It also controls the whole LFSCK speed via lfsck_control_speed() to
* avoid the server to become overload.
*
* Return:
* * %positive number if all objects have been scanned
* * %0 if the iteration is stopped or paused
* * %negative error number on failure
*/
static int lfsck_master_oit_engine(const struct lu_env *env,
struct lfsck_instance *lfsck)
{
struct lfsck_thread_info *info = lfsck_env_info(env);
const struct dt_it_ops *iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
struct dt_it *di = lfsck->li_di_oit;
struct lu_fid *fid = &info->lti_fid;
struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
struct seq_server_site *ss = lfsck_dev_site(lfsck);
__u32 idx = lfsck_dev_idx(lfsck);
int rc = 0;
ENTRY;
if (unlikely(ss == NULL))
RETURN(-EIO);
while (!lfsck_should_stop(lfsck) &&
(rc == 0 || lfsck->li_di_dir != NULL)) {
struct dt_object *target;
if (lfsck->li_di_dir != NULL) {
rc = lfsck_master_dir_engine(env, lfsck);
if (rc <= 0)
RETURN(rc);
}
if (unlikely(lfsck->li_oit_over))
RETURN(1);
if (LFSCK_FAIL_TIMEOUT(lfsck, OBD_FAIL_LFSCK_DELAY1,
cfs_fail_val)) {
CDEBUG(D_LFSCK,
"%s: OIT scan exit for engine stop, cookie %llu\n",
lfsck_lfsck2name(lfsck), iops->store(env, di));
RETURN(0);
}
if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
RETURN(0);
lfsck->li_current_oit_processed = 1;
if (!list_empty(&lfsck->li_list_lmv)) {
struct lfsck_lmv_unit *llu;
spin_lock(&lfsck->li_lock);
llu = list_first_entry(&lfsck->li_list_lmv,
struct lfsck_lmv_unit, llu_link);
list_del_init(&llu->llu_link);
spin_unlock(&lfsck->li_lock);
lfsck->li_lmv = &llu->llu_lmv;
lfsck->li_obj_dir = lfsck_object_get(llu->llu_obj);
rc = lfsck_open_dir(env, lfsck, 0);
if (rc == 0)
rc = lfsck_master_dir_engine(env, lfsck);
if (rc <= 0)
RETURN(rc);
}
lfsck->li_new_scanned++;
lfsck->li_pos_current.lp_oit_cookie = iops->store(env, di);
rc = iops->rec(env, di, (struct dt_rec *)fid, 0);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: OIT scan failed at rec(): rc = %d\n",
lfsck_lfsck2name(lfsck), rc);
lfsck_fail(env, lfsck, true);
if (rc < 0 && bk->lb_param & LPF_FAILOUT)
RETURN(rc);
else
goto checkpoint;
}
if (unlikely(!fid_is_sane(fid))) {
CDEBUG(D_LFSCK, "%s: OIT scan find invalid FID "DFID
", skip it\n",
lfsck_lfsck2name(lfsck), PFID(fid));
goto checkpoint;
}
if (fid_is_idif(fid)) {
__u32 idx1 = fid_idif_ost_idx(fid);
LASSERT(!lfsck->li_master);
if (idx != idx1) {
struct ost_id *oi = &info->lti_oi;
if (unlikely(idx1 != 0)) {
CDEBUG(D_LFSCK, "%s: invalid IDIF "DFID
", not match device index %u\n",
lfsck_lfsck2name(lfsck),
PFID(fid), idx);
goto checkpoint;
}
/* rebuild the IDIF with index to avoid double
* instances for the same object.
*/
fid_to_ostid(fid, oi);
ostid_to_fid(fid, oi, idx);
}
} else if (!fid_is_norm(fid) && !fid_is_igif(fid) &&
!fid_is_last_id(fid) &&
!lu_fid_eq(fid, &lfsck->li_global_root_fid)) {
/* If the FID/object is only used locally and invisible
* to external nodes, then LFSCK will not handle it.
*
* dot_lustre sequence has been handled specially.
*/
goto checkpoint;
} else {
struct lu_seq_range *range = &info->lti_range;
if (lfsck->li_master)
fld_range_set_mdt(range);
else
fld_range_set_ost(range);
rc = fld_local_lookup(env, ss->ss_server_fld,
fid_seq(fid), range);
if (rc != 0 || range->lsr_index != idx) {
/* Remote object will be handled by the LFSCK
* instance on the MDT where the remote object
* really resides on.
*/
rc = 0;
goto checkpoint;
}
}
target = lfsck_object_find_bottom(env, lfsck, fid);
if (IS_ERR(target)) {
CDEBUG(D_LFSCK, "%s: OIT scan failed at find target "
DFID", cookie %llu: rc = %ld\n",
lfsck_lfsck2name(lfsck), PFID(fid),
iops->store(env, di), PTR_ERR(target));
lfsck_fail(env, lfsck, true);
if (bk->lb_param & LPF_FAILOUT)
RETURN(PTR_ERR(target));
else
goto checkpoint;
}
if (dt_object_exists(target))
rc = lfsck_exec_oit(env, lfsck, target);
lfsck_object_put(env, target);
if (rc != 0 && bk->lb_param & LPF_FAILOUT)
RETURN(rc);
checkpoint:
rc = lfsck_checkpoint(env, lfsck);
if (rc != 0 && bk->lb_param & LPF_FAILOUT)
RETURN(rc);
/* Rate control. */
lfsck_control_speed(lfsck);
if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL1))
RETURN(-EINVAL);
rc = iops->next(env, di);
if (unlikely(rc > 0))
lfsck->li_oit_over = 1;
else if (likely(rc == 0))
lfsck->li_current_oit_processed = 0;
else
CDEBUG(D_LFSCK,
"%s oit engine fail to locate next at %llu: rc = %d\n",
lfsck_lfsck2name(lfsck), iops->store(env, di),
rc);
}
RETURN(rc);
}
int lfsck_master_engine(void *args)
{
struct lfsck_thread_args *lta = args;
struct lu_env *env = <a->lta_env;
struct lfsck_instance *lfsck = lta->lta_lfsck;
struct dt_object *oit_obj = lfsck->li_obj_oit;
const struct dt_it_ops *oit_iops = &oit_obj->do_index_ops->dio_it;
struct dt_it *oit_di;
int rc;
ENTRY;
/* incase lfsck thread falls in loop of sending RPC, allow signal to
* interrupt it.
*/
allow_signal(SIGINT);
wait_var_event(lfsck, lfsck->li_start_unplug || kthread_should_stop());
if (kthread_should_stop())
GOTO(fini_args, rc = 0);
/* There will be some objects verification during the LFSCK start,
* such as the subsequent lfsck_verify_lpf(). Trigger low layer OI
* OI scrub before that to handle the potential inconsistence.
*/
oit_di = oit_iops->init(env, oit_obj, lfsck->li_args_oit);
if (IS_ERR(oit_di)) {
rc = PTR_ERR(oit_di);
CDEBUG(D_LFSCK,
"%s: master engine fail to init iteration: rc = %d\n",
lfsck_lfsck2name(lfsck), rc);
GOTO(fini_args, rc);
}
if (lfsck->li_master &&
(!list_empty(&lfsck->li_list_scan) ||
!list_empty(&lfsck->li_list_double_scan))) {
rc = lfsck_verify_lpf(env, lfsck);
/* FIXME: once OI files are missing, this will fail, it should
* return error, but to satisfy sanity-lfsck test 4 & 5, leave
* it uninitialized here, and any code dereference it need to
* check.
*/
if (rc != 0)
CERROR("%s: master engine fail to verify the .lustre/lost+found/, go ahead: rc = %d\n",
lfsck_lfsck2name(lfsck), rc);
}
spin_lock(&lfsck->li_lock);
lfsck->li_di_oit = oit_di;
spin_unlock(&lfsck->li_lock);
rc = lfsck_prep(env, lfsck, <a->lta_lsp);
if (rc != 0)
GOTO(fini_oit, rc);
CDEBUG(D_LFSCK,
"%s entry: oit_flags = %#x, dir_flags = %#x, oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID", pid = %d\n",
lfsck_lfsck2name(lfsck), lfsck->li_args_oit, lfsck->li_args_dir,
lfsck->li_pos_checkpoint.lp_oit_cookie,
lfsck->li_pos_checkpoint.lp_dir_cookie,
PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
current->pid);
lfsck->li_master_ready = 1;
wake_up_var(lfsck);
if (!list_empty(&lfsck->li_list_scan) ||
list_empty(&lfsck->li_list_double_scan))
rc = lfsck_master_oit_engine(env, lfsck);
else
rc = 1;
lfsck_pos_fill(env, lfsck, &lfsck->li_pos_checkpoint, false);
CDEBUG(D_LFSCK,
"%s %p exit: oit_flags = %#x, dir_flags = %#x, oit_cookie = %llu, dir_cookie = %#llx, parent = "DFID", pid = %d: rc = %d\n",
lfsck_lfsck2name(lfsck), current, lfsck->li_args_oit,
lfsck->li_args_dir,
lfsck->li_pos_checkpoint.lp_oit_cookie,
lfsck->li_pos_checkpoint.lp_dir_cookie,
PFID(&lfsck->li_pos_checkpoint.lp_dir_parent),
current->pid, rc);
if (!CFS_FAIL_CHECK(OBD_FAIL_LFSCK_CRASH))
rc = lfsck_post(env, lfsck, rc);
else
lfsck_close_dir(env, lfsck, rc);
fini_oit:
lfsck_di_oit_put(env, lfsck);
oit_iops->fini(env, oit_di);
if (rc == 1) {
if (!list_empty(&lfsck->li_list_double_scan))
rc = lfsck_double_scan(env, lfsck);
else
rc = 0;
} else {
lfsck_quit(env, lfsck);
}
/* XXX: Purge the pinned objects in the future. */
fini_args:
lfsck_thread_args_fini(lta);
if (xchg(&lfsck->li_task, NULL) == NULL)
wait_var_event(lfsck, kthread_should_stop());
wake_up_var(lfsck);
RETURN(rc);
}
static inline bool lfsck_assistant_req_empty(struct lfsck_assistant_data *lad)
{
bool empty = false;
spin_lock(&lad->lad_lock);
if (list_empty(&lad->lad_req_list))
empty = true;
spin_unlock(&lad->lad_lock);
return empty;
}
/**
* lfsck_assistant_query_others() - Query the LFSCK status from the instatnces
* on remote servers.
* @env: pointer to the thread context
* @com: pointer to the lfsck component
*
* The LFSCK assistant thread queries the LFSCK instances on other
* servers (MDT/OST) about their status, such as whether they have
* finished the phase1/phase2 scanning or not, and so on.
*
* Return:
* * %0 for success
* * %negative error number on failure
*/
static int lfsck_assistant_query_others(const struct lu_env *env,
struct lfsck_component *com)
{
struct lfsck_thread_info *info = lfsck_env_info(env);
struct lfsck_request *lr = &info->lti_lr;
struct lfsck_async_interpret_args *laia = &info->lti_laia;
struct lfsck_instance *lfsck = com->lc_lfsck;
struct lfsck_assistant_data *lad = com->lc_data;
struct ptlrpc_request_set *set;
struct lfsck_tgt_descs *ltds;
struct lfsck_tgt_desc *ltd;
struct list_head *phase_head;
int rc = 0;
int rc1 = 0;
ENTRY;
set = ptlrpc_prep_set();
if (set == NULL)
RETURN(-ENOMEM);
lad->lad_touch_gen++;
memset(lr, 0, sizeof(*lr));
lr->lr_event = LE_QUERY;
lr->lr_active = com->lc_type;
memset(laia, 0, sizeof(*laia));
laia->laia_com = com;
laia->laia_lr = lr;
if (!list_empty(&lad->lad_mdt_phase1_list)) {
ltds = &lfsck->li_mdt_descs;
lr->lr_flags = 0;
phase_head = &lad->lad_mdt_phase1_list;
} else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
goto out;
} else {
again:
ltds = &lfsck->li_ost_descs;
lr->lr_flags = LEF_TO_OST;
phase_head = &lad->lad_ost_phase1_list;
}
laia->laia_ltds = ltds;
spin_lock(<ds->ltd_lock);
while (!list_empty(phase_head) && !lfsck_should_stop(lfsck)) {
struct list_head *phase_list;
__u32 *gen;
if (com->lc_type == LFSCK_TYPE_LAYOUT) {
ltd = list_first_entry(phase_head,
struct lfsck_tgt_desc,
ltd_layout_phase_list);
phase_list = <d->ltd_layout_phase_list;
gen = <d->ltd_layout_gen;
} else {
ltd = list_first_entry(phase_head,
struct lfsck_tgt_desc,
ltd_namespace_phase_list);
phase_list = <d->ltd_namespace_phase_list;
gen = <d->ltd_namespace_gen;
}
if (*gen == lad->lad_touch_gen)
break;
*gen = lad->lad_touch_gen;
list_move_tail(phase_list, phase_head);
kref_get(<d->ltd_ref);
laia->laia_ltd = ltd;
spin_unlock(<ds->ltd_lock);
rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
lfsck_async_interpret_common,
laia, LFSCK_QUERY);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: LFSCK assistant fail to query %s %x for %s: rc = %d\n",
lfsck_lfsck2name(lfsck),
(lr->lr_flags & LEF_TO_OST) ? "OST" : "MDT",
ltd->ltd_index, lad->lad_name, rc);
kref_put(<d->ltd_ref, lfsck_tgt_free);
rc1 = rc;
}
spin_lock(<ds->ltd_lock);
}
spin_unlock(<ds->ltd_lock);
rc = ptlrpc_set_wait(env, set);
if (rc < 0) {
ptlrpc_set_destroy(set);
RETURN(rc);
}
if (com->lc_type == LFSCK_TYPE_LAYOUT && !(lr->lr_flags & LEF_TO_OST) &&
list_empty(&lad->lad_mdt_phase1_list))
goto again;
out:
ptlrpc_set_destroy(set);
RETURN(rc1 != 0 ? rc1 : rc);
}
/**
* lfsck_assistant_notify_others() - Notify the LFSCK event to the instances on
* remote servers.
* @env: pointer to the thread context
* @com: pointer to the lfsck component
* @lr: pointer to the LFSCK event request
*
* The LFSCK assistant thread notifies the LFSCK instances on other
* servers (MDT/OST) about some events, such as start new scanning,
* stop the scanning, this LFSCK instance will exit, and so on.
*
* Return:
* * %0 for success
* * %negative error number on failure
*/
static int lfsck_assistant_notify_others(const struct lu_env *env,
struct lfsck_component *com,
struct lfsck_request *lr)
{
struct lfsck_thread_info *info = lfsck_env_info(env);
struct lfsck_async_interpret_args *laia = &info->lti_laia;
struct lfsck_instance *lfsck = com->lc_lfsck;
struct lfsck_assistant_data *lad = com->lc_data;
struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
struct ptlrpc_request_set *set;
struct lfsck_tgt_descs *ltds;
struct lfsck_tgt_desc *ltd;
struct lfsck_tgt_desc *next;
int idx;
int rc = 0;
int rc1 = 0;
ENTRY;
set = ptlrpc_prep_set();
if (set == NULL)
RETURN(-ENOMEM);
lr->lr_index = lfsck_dev_idx(lfsck);
lr->lr_active = com->lc_type;
memset(laia, 0, sizeof(*laia));
laia->laia_com = com;
laia->laia_lr = lr;
switch (lr->lr_event) {
case LE_START:
if (com->lc_type != LFSCK_TYPE_LAYOUT)
goto next;
lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN;
lr->lr_speed = bk->lb_speed_limit;
lr->lr_version = bk->lb_version;
lr->lr_param |= bk->lb_param;
lr->lr_async_windows = bk->lb_async_windows;
lr->lr_flags = LEF_TO_OST;
/* Notify OSTs firstly, then handle other MDTs if needed. */
ltds = &lfsck->li_ost_descs;
laia->laia_ltds = ltds;
down_read(<ds->ltd_rw_sem);
for_each_set_bit(idx, ltds->ltd_tgts_bitmap,
ltds->ltd_tgts_mask_len) {
ltd = lfsck_tgt_get(ltds, idx);
LASSERT(ltd != NULL);
laia->laia_ltd = ltd;
rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
lfsck_async_interpret_common,
laia, LFSCK_NOTIFY);
if (rc != 0) {
lfsck_lad_set_bitmap(env, com, idx);
CDEBUG(D_LFSCK,
"%s: LFSCK assistant fail to notify OST %x for %s start: rc = %d\n",
lfsck_lfsck2name(lfsck), idx,
lad->lad_name, rc);
kref_put(<d->ltd_ref, lfsck_tgt_free);
}
}
up_read(<ds->ltd_rw_sem);
/* Sync up */
rc = ptlrpc_set_wait(env, set);
if (rc < 0) {
ptlrpc_set_destroy(set);
RETURN(rc);
}
next:
if (!(bk->lb_param & LPF_ALL_TGT))
break;
/* link other MDT targets locallly. */
ltds = &lfsck->li_mdt_descs;
spin_lock(<ds->ltd_lock);
if (com->lc_type == LFSCK_TYPE_LAYOUT) {
for_each_set_bit(idx, ltds->ltd_tgts_bitmap,
ltds->ltd_tgts_mask_len) {
ltd = lfsck_ltd2tgt(ltds, idx);
LASSERT(ltd != NULL);
if (!list_empty(<d->ltd_layout_list))
continue;
list_add_tail(<d->ltd_layout_list,
&lad->lad_mdt_list);
list_add_tail(<d->ltd_layout_phase_list,
&lad->lad_mdt_phase1_list);
}
} else {
for_each_set_bit(idx, ltds->ltd_tgts_bitmap,
ltds->ltd_tgts_mask_len) {
ltd = lfsck_ltd2tgt(ltds, idx);
LASSERT(ltd != NULL);
if (!list_empty(<d->ltd_namespace_list))
continue;
list_add_tail(<d->ltd_namespace_list,
&lad->lad_mdt_list);
list_add_tail(<d->ltd_namespace_phase_list,
&lad->lad_mdt_phase1_list);
}
}
spin_unlock(<ds->ltd_lock);
break;
case LE_STOP:
case LE_PHASE2_DONE:
case LE_PEER_EXIT: {
struct list_head *phase_head;
/* Handle other MDTs firstly if needed, then notify the OSTs. */
if (bk->lb_param & LPF_ALL_TGT) {
phase_head = &lad->lad_mdt_list;
ltds = &lfsck->li_mdt_descs;
if (lr->lr_event == LE_STOP) {
/* unlink other MDT targets locallly. */
spin_lock(<ds->ltd_lock);
if (com->lc_type == LFSCK_TYPE_LAYOUT) {
list_for_each_entry_safe(ltd, next,
phase_head, ltd_layout_list) {
list_del_init(
<d->ltd_layout_phase_list);
list_del_init(
<d->ltd_layout_list);
}
} else {
list_for_each_entry_safe(ltd, next,
phase_head,
ltd_namespace_list) {
list_del_init(
<d->ltd_namespace_phase_list);
list_del_init(
<d->ltd_namespace_list);
}
}
spin_unlock(<ds->ltd_lock);
if (com->lc_type != LFSCK_TYPE_LAYOUT)
break;
lr->lr_flags |= LEF_TO_OST;
phase_head = &lad->lad_ost_list;
ltds = &lfsck->li_ost_descs;
} else {
lr->lr_flags &= ~LEF_TO_OST;
}
} else if (com->lc_type != LFSCK_TYPE_LAYOUT) {
break;
} else {
lr->lr_flags |= LEF_TO_OST;
phase_head = &lad->lad_ost_list;
ltds = &lfsck->li_ost_descs;
}
again:
laia->laia_ltds = ltds;
spin_lock(<ds->ltd_lock);
while (!list_empty(phase_head)) {
if (com->lc_type == LFSCK_TYPE_LAYOUT) {
ltd = list_first_entry(phase_head,
struct lfsck_tgt_desc,
ltd_layout_list);
if (!list_empty(<d->ltd_layout_phase_list))
list_del_init(
<d->ltd_layout_phase_list);
list_del_init(<d->ltd_layout_list);
} else {
ltd = list_first_entry(phase_head,
struct lfsck_tgt_desc,
ltd_namespace_list);
if (!list_empty(<d->ltd_namespace_phase_list))
list_del_init(
<d->ltd_namespace_phase_list);
list_del_init(<d->ltd_namespace_list);
}
kref_get(<d->ltd_ref);
laia->laia_ltd = ltd;
spin_unlock(<ds->ltd_lock);
rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
lfsck_async_interpret_common,
laia, LFSCK_NOTIFY);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: LFSCK assistant fail to notify %s %x for %s stop/phase2_done/ peer_exit: rc = %d\n",
lfsck_lfsck2name(lfsck),
(lr->lr_flags & LEF_TO_OST) ?
"OST" : "MDT", ltd->ltd_index,
lad->lad_name, rc);
kref_put(<d->ltd_ref, lfsck_tgt_free);
}
spin_lock(<ds->ltd_lock);
}
spin_unlock(<ds->ltd_lock);
rc = ptlrpc_set_wait(env, set);
if (rc < 0) {
ptlrpc_set_destroy(set);
RETURN(rc);
}
if (com->lc_type == LFSCK_TYPE_LAYOUT &&
!(lr->lr_flags & LEF_TO_OST)) {
lr->lr_flags |= LEF_TO_OST;
phase_head = &lad->lad_ost_list;
ltds = &lfsck->li_ost_descs;
goto again;
}
break;
}
case LE_PHASE1_DONE:
lad->lad_ops->la_sync_failures(env, com, lr);
lad->lad_touch_gen++;
ltds = &lfsck->li_mdt_descs;
laia->laia_ltds = ltds;
spin_lock(<ds->ltd_lock);
while (!list_empty(&lad->lad_mdt_list)) {
struct list_head *list;
__u32 *gen;
if (com->lc_type == LFSCK_TYPE_LAYOUT) {
ltd = list_first_entry(&lad->lad_mdt_list,
struct lfsck_tgt_desc,
ltd_layout_list);
list = <d->ltd_layout_list;
gen = <d->ltd_layout_gen;
} else {
struct lfsck_namespace *ns = com->lc_file_ram;
ltd = list_first_entry(&lad->lad_mdt_list,
struct lfsck_tgt_desc,
ltd_namespace_list);
list = <d->ltd_namespace_list;
gen = <d->ltd_namespace_gen;
lr->lr_flags2 = ns->ln_flags & ~LF_INCOMPLETE;
}
if (*gen == lad->lad_touch_gen)
break;
*gen = lad->lad_touch_gen;
list_move_tail(list, &lad->lad_mdt_list);
if (ltd->ltd_synced_failures)
continue;
kref_get(<d->ltd_ref);
laia->laia_ltd = ltd;
spin_unlock(<ds->ltd_lock);
rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
lfsck_async_interpret_common,
laia, LFSCK_NOTIFY);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: LFSCK assistant fail to notify MDT %x for %s phase1 done: rc = %d\n",
lfsck_lfsck2name(lfsck), ltd->ltd_index,
lad->lad_name, rc);
kref_put(<d->ltd_ref, lfsck_tgt_free);
}
spin_lock(<ds->ltd_lock);
}
spin_unlock(<ds->ltd_lock);
break;
default:
CDEBUG(D_LFSCK,
"%s: LFSCK assistant unexpected LFSCK event: rc = %d\n",
lfsck_lfsck2name(lfsck), lr->lr_event);
rc = -EINVAL;
break;
}
rc1 = ptlrpc_set_wait(env, set);
ptlrpc_set_destroy(set);
RETURN(rc != 0 ? rc : rc1);
}
/**
* lfsck_assistant_engine() - LFSCK assistant engine
* @args: Pointer to struct lfsck_thread_args
*
* The LFSCK assistant thread is triggered by the LFSCK main engine.
* They co-work together as an asynchronous pipeline: the LFSCK main
* engine scans the system and pre-fetches the objects, attributes,
* or name entries, etc, and pushes them into the pipeline as input
* requests for the LFSCK assistant thread; on the other end of the
* pipeline, the LFSCK assistant thread performs the real check and
* repair for every request from the main engine.
*
* Generally, the assistant engine may be blocked when check/repair
* something, so the LFSCK main engine will run some faster. On the
* other hand, the LFSCK main engine will drive multiple assistant
* threads in parallel, means for each LFSCK component on the master
* (such as layout LFSCK, namespace LFSCK), there is an independent
* LFSCK assistant thread. So under such 1:N multiple asynchronous
* pipelines mode, the whole LFSCK performance will be much better
* than check/repair everything by the LFSCK main engine itself.
*
* Return:
* * %positive number if all objects have been scanned
* * %0 if the iteration is stopped or paused
* * %negative error number on failure
*/
int lfsck_assistant_engine(void *args)
{
struct lfsck_thread_args *lta = args;
struct lu_env *env = <a->lta_env;
struct lfsck_component *com = lta->lta_com;
struct lfsck_instance *lfsck = lta->lta_lfsck;
struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
struct lfsck_position *pos = &com->lc_pos_start;
struct lfsck_thread_info *info = lfsck_env_info(env);
struct lfsck_request *lr = &info->lti_lr;
struct lfsck_assistant_data *lad = com->lc_data;
const struct lfsck_assistant_operations *lao = lad->lad_ops;
struct lfsck_assistant_req *lar;
int rc = 0;
int rc1 = 0;
int rc2;
ENTRY;
CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread start\n",
lfsck_lfsck2name(lfsck), lad->lad_name);
/* incase lfsck thread falls in loop of sending RPC, allow signal to
* interrupt it.
*/
allow_signal(SIGINT);
memset(lr, 0, sizeof(*lr));
lr->lr_event = LE_START;
if (pos->lp_oit_cookie <= 1)
lr->lr_param = LPF_RESET;
rc = lfsck_assistant_notify_others(env, com, lr);
if (rc != 0) {
CDEBUG(D_LFSCK,
"%s: LFSCK assistant fail to notify others to start %s: rc = %d\n",
lfsck_lfsck2name(lfsck), lad->lad_name, rc);
GOTO(fini, rc);
}
while (!lfsck_should_stop(lfsck)) {
while (!list_empty(&lad->lad_req_list) &&
!lfsck_should_stop(lfsck)) {
lar = list_first_entry(&lad->lad_req_list,
struct lfsck_assistant_req,
lar_list);
/* Only the lfsck_assistant_engine thread itself can
* remove the "lar" from the head of the list, LFSCK
* engine thread only inserts other new "lar" at the
* end of the list. So it is safe to handle current
* "lar" without the spin_lock.
*/
rc = lao->la_handler_p1(env, com, lar);
spin_lock(&lad->lad_lock);
list_del_init(&lar->lar_list);
lad->lad_prefetched--;
/* Wake up the main engine thread only when the list
* is empty or half of the prefetched items have been
* handled to avoid too frequent thread schedule.
*/
if (lad->lad_prefetched <= (bk->lb_async_windows / 2))
wake_up_var(lfsck);
spin_unlock(&lad->lad_lock);
lao->la_req_fini(env, lar);
if (rc < 0 && bk->lb_param & LPF_FAILOUT)
GOTO(cleanup, rc);
}
wait_var_event(lfsck, !lfsck_assistant_req_empty(lad) ||
lfsck_should_stop(lfsck) ||
test_bit(LAD_TO_POST, &lad->lad_flags) ||
test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags));
if (unlikely(lfsck_should_stop(lfsck)))
GOTO(cleanup, rc = lad->lad_post_result);
if (!list_empty(&lad->lad_req_list))
continue;
if (test_bit(LAD_TO_POST, &lad->lad_flags)) {
CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread post\n",
lfsck_lfsck2name(lfsck), lad->lad_name);
clear_bit(LAD_TO_POST, &lad->lad_flags);
LASSERT(lad->lad_post_result > 0);
wake_up_var(lfsck);
memset(lr, 0, sizeof(*lr));
lr->lr_event = LE_PHASE1_DONE;
lr->lr_status = lad->lad_post_result;
rc = lfsck_assistant_notify_others(env, com, lr);
CDEBUG(D_LFSCK,
"%s: LFSCK assistant notified others for %s post: rc = %d\n",
lfsck_lfsck2name(lfsck),
lad->lad_name, rc);
}
if (test_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags)) {
clear_bit(LAD_TO_DOUBLE_SCAN, &lad->lad_flags);
atomic_inc(&lfsck->li_double_scan_count);
set_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags);
wake_up_var(lfsck);
com->lc_new_checked = 0;
com->lc_new_scanned = 0;
com->lc_time_last_checkpoint = ktime_get_seconds();
com->lc_time_next_checkpoint =
com->lc_time_last_checkpoint +
LFSCK_CHECKPOINT_INTERVAL;
CDEBUG(D_LFSCK,
"%s: LFSCK assistant sync before the second-stage scaning\n",
lfsck_lfsck2name(lfsck));
/* Flush async updates before handling orphan. */
rc2 = dt_sync(env, lfsck->li_next);
CDEBUG(D_LFSCK,
"%s: LFSCK assistant phase2 scan start, synced: rc = %d\n",
lfsck_lfsck2name(lfsck), rc2);
if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
GOTO(cleanup, rc = 0);
while (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags) &&
!lfsck_should_stop(lfsck)) {
int seconds = 30;
rc = lfsck_assistant_query_others(env, com);
if (lfsck_phase2_next_ready(lad))
goto p2_next;
if (rc < 0)
GOTO(cleanup, rc);
/* Pull LFSCK status on related targets once
* per 30 seconds if we are not notified.
*/
while (seconds > 0 &&
wait_var_event_timeout(lfsck,
lfsck_phase2_next_ready(lad) ||
lfsck_should_stop(lfsck),
cfs_time_seconds(1)) == 0)
seconds -= 1;
if (lfsck_should_stop(lfsck))
GOTO(cleanup, rc = 0);
if (seconds == 0)
continue;
p2_next:
rc = lao->la_handler_p2(env, com);
if (rc != 0)
GOTO(cleanup, rc);
}
}
}
cleanup:
/* Cleanup the unfinished requests. */
spin_lock(&lad->lad_lock);
if (rc < 0)
lad->lad_assistant_status = rc;
if (lfsck_should_stop(lfsck) &&
lad->lad_post_result <= 0)
lao->la_fill_pos(env, com, &lfsck->li_pos_checkpoint);
while (!list_empty(&lad->lad_req_list)) {
lar = list_first_entry(&lad->lad_req_list,
struct lfsck_assistant_req,
lar_list);
list_del_init(&lar->lar_list);
lad->lad_prefetched--;
spin_unlock(&lad->lad_lock);
lao->la_req_fini(env, lar);
spin_lock(&lad->lad_lock);
}
spin_unlock(&lad->lad_lock);
memset(lr, 0, sizeof(*lr));
if (rc > 0) {
lr->lr_event = LE_PHASE2_DONE;
lr->lr_status = rc;
} else if (rc == 0) {
if (lfsck->li_flags & LPF_ALL_TGT) {
lr->lr_event = LE_STOP;
lr->lr_status = LS_STOPPED;
} else {
lr->lr_event = LE_PEER_EXIT;
switch (lfsck->li_status) {
case LS_PAUSED:
case LS_CO_PAUSED:
lr->lr_status = LS_CO_PAUSED;
break;
case LS_STOPPED:
case LS_CO_STOPPED:
lr->lr_status = LS_CO_STOPPED;
break;
default:
CDEBUG(D_LFSCK,
"%s: LFSCK assistant unknown status: rc = %d\n",
lfsck_lfsck2name(lfsck),
lfsck->li_status);
lr->lr_status = LS_CO_FAILED;
break;
}
}
} else {
if (lfsck->li_flags & LPF_ALL_TGT) {
lr->lr_event = LE_STOP;
lr->lr_status = LS_FAILED;
} else {
lr->lr_event = LE_PEER_EXIT;
lr->lr_status = LS_CO_FAILED;
}
}
rc1 = lfsck_assistant_notify_others(env, com, lr);
if (rc1 != 0) {
CDEBUG(D_LFSCK,
"%s: LFSCK assistant failed to notify others for %s quit: rc = %d\n",
lfsck_lfsck2name(lfsck), lad->lad_name, rc1);
rc = rc1;
}
CDEBUG(D_LFSCK, "%s: LFSCK assistant sync before exit\n",
lfsck_lfsck2name(lfsck));
/* Flush async updates before exit. */
rc2 = dt_sync(env, lfsck->li_next);
CDEBUG(D_LFSCK, "%s: LFSCK assistant synced before exit: rc = %d\n",
lfsck_lfsck2name(lfsck), rc2);
/* Under force exit case, some requests may be just freed without
* verification, those objects should be re-handled when next run.
* So not update the on-disk trace file under such case.
*/
if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
if (!lfsck_should_stop(lfsck))
rc1 = lao->la_double_scan_result(env, com, rc);
CDEBUG(D_LFSCK,
"%s: LFSCK assistant phase2 scan finished: rc = %d\n",
lfsck_lfsck2name(lfsck), rc1 != 0 ? rc1 : rc);
}
fini:
if (test_bit(LAD_IN_DOUBLE_SCAN, &lad->lad_flags)) {
atomic_dec(&lfsck->li_double_scan_count);
wake_up_var(lfsck);
}
lad->lad_assistant_status = (rc1 != 0 ? rc1 : rc);
CDEBUG(D_LFSCK, "%s: %s LFSCK assistant thread exit: rc = %d\n",
lfsck_lfsck2name(lfsck), lad->lad_name,
lad->lad_assistant_status);
lfsck_thread_args_fini(lta);
if (xchg(&lad->lad_task, NULL) == NULL)
wait_var_event(lfsck, kthread_should_stop());
set_bit(LAD_STOPPED, &lad->lad_flags);
wake_up_var(lfsck);
return rc;
}
