return ldlm_lvbo_update(res, NULL, req, increase);
}
+int is_granted_or_cancelled_nolock(struct ldlm_lock *lock);
+
int ldlm_error2errno(enum ldlm_error error);
enum ldlm_error ldlm_errno2error(int err_no); /* don't call it `errno': this
* confuses user-space. */
#define OBD_CONNECT2_LSOM 0x800ULL /* LSOM support */
#define OBD_CONNECT2_PCC 0x1000ULL /* Persistent Client Cache */
#define OBD_CONNECT2_PLAIN_LAYOUT 0x2000ULL /* Plain Directory Layout */
+#define OBD_CONNECT2_ASYNC_DISCARD 0x4000ULL /* support async DoM data discard */
/* XXX README XXX:
* Please DO NOT add flag values here before first ensuring that this same
OBD_CONNECT2_LOCK_CONVERT | \
OBD_CONNECT2_ARCHIVE_ID_ARRAY | \
OBD_CONNECT2_SELINUX_POLICY | \
- OBD_CONNECT2_LSOM)
+ OBD_CONNECT2_LSOM | \
+ OBD_CONNECT2_ASYNC_DISCARD)
#define OST_CONNECT_SUPPORTED (OBD_CONNECT_SRVLOCK | OBD_CONNECT_GRANT | \
OBD_CONNECT_REQPORTAL | OBD_CONNECT_VERSION | \
static inline int is_granted_or_cancelled(struct ldlm_lock *lock)
{
- int ret = 0;
+ int ret = 0;
- lock_res_and_lock(lock);
- if (ldlm_is_granted(lock) && !ldlm_is_cp_reqd(lock))
- ret = 1;
- else if (ldlm_is_failed(lock) || ldlm_is_cancel(lock))
- ret = 1;
- unlock_res_and_lock(lock);
+ lock_res_and_lock(lock);
+ ret = is_granted_or_cancelled_nolock(lock);
+ unlock_res_and_lock(lock);
- return ret;
+ return ret;
}
static inline bool is_bl_done(struct ldlm_lock *lock)
RETURN(0);
}
+int is_granted_or_cancelled_nolock(struct ldlm_lock *lock)
+{
+ int ret = 0;
+
+ check_res_locked(lock->l_resource);
+ if (ldlm_is_granted(lock) && !ldlm_is_cp_reqd(lock))
+ ret = 1;
+ else if (ldlm_is_failed(lock) || ldlm_is_cancel(lock))
+ ret = 1;
+ return ret;
+}
+EXPORT_SYMBOL(is_granted_or_cancelled_nolock);
+
/**
* Calculate the Completion timeout (covering enqueue, BL AST, data flush,
* lock cancel, and their replies). Used for lock completion timeout on the
OBD_CONNECT2_FLR |
OBD_CONNECT2_LOCK_CONVERT |
OBD_CONNECT2_ARCHIVE_ID_ARRAY |
- OBD_CONNECT2_LSOM;
+ OBD_CONNECT2_LSOM |
+ OBD_CONNECT2_ASYNC_DISCARD;
#ifdef HAVE_LRU_RESIZE_SUPPORT
if (sbi->ll_flags & LL_SBI_LRU_RESIZE)
unsigned long nrpages;
ENTRY;
- if (S_ISREG(inode->i_mode) && lli->lli_clob != NULL)
+ if (S_ISREG(inode->i_mode) && lli->lli_clob != NULL) {
/* It is last chance to write out dirty pages,
- * otherwise we may lose data while umount */
- cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
-
+ * otherwise we may lose data while umount.
+ *
+ * If i_nlink is 0 then just discard data. This is safe because
+ * local inode gets i_nlink 0 from server only for the last
+ * unlink, so that file is not opened somewhere else
+ */
+ cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, inode->i_nlink ?
+ CL_FSYNC_LOCAL : CL_FSYNC_DISCARD, 1);
+ }
truncate_inode_pages_final(mapping);
/* Workaround for LU-118: Note nrpages may not be totally updated when
__u64 bits = to_cancel;
int rc;
- if (inode == NULL)
- return;
+ ENTRY;
+
+ if (!inode) {
+ /* That means the inode is evicted most likely and may cause
+ * the skipping of lock cleanups below, so print the message
+ * about that in log.
+ */
+ if (lock->l_resource->lr_lvb_inode)
+ LDLM_DEBUG(lock,
+ "can't take inode for the lock (%sevicted)\n",
+ lock->l_resource->lr_lvb_inode->i_state &
+ I_FREEING ? "" : "not ");
+ RETURN_EXIT;
+ }
if (!fid_res_name_eq(ll_inode2fid(inode),
&lock->l_resource->lr_name)) {
ll_invalidate_aliases(inode);
iput(inode);
+ RETURN_EXIT;
}
/* Check if the given lock may be downgraded instead of canceling and
struct ldlm_lock **lockp, __u64 flags);
int mdt_dom_read_on_open(struct mdt_thread_info *mti, struct mdt_device *mdt,
struct lustre_handle *lh);
-void mdt_dom_discard_data(struct mdt_thread_info *info,
- const struct lu_fid *fid);
+void mdt_dom_discard_data(struct mdt_thread_info *info, struct mdt_object *mo);
int mdt_dom_disk_lvbo_update(const struct lu_env *env, struct mdt_object *mo,
struct ldlm_resource *res, bool increase_only);
void mdt_dom_obj_lvb_update(const struct lu_env *env, struct mdt_object *mo,
{
struct dt_object *dob;
int i, j, rc, tot_bytes = 0;
+ int level;
ENTRY;
mdt_dom_read_lock(mo);
- if (!mdt_object_exists(mo))
- GOTO(unlock, rc = -ENOENT);
+ *nr_local = 0;
+ /* the only valid case when READ can find object is missing or stale
+ * when export is just evicted and open files are closed forcefully
+ * on server while client's READ can be in progress.
+ * This should not happen on healthy export, object can't be missing
+ * or dying because both states means it was finally destroyed.
+ */
+ level = exp->exp_failed ? D_INFO : D_ERROR;
+ if (!mdt_object_exists(mo)) {
+ CDEBUG_LIMIT(level,
+ "%s: READ IO to missing obj "DFID": rc = %d\n",
+ exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
+ -ENOENT);
+ /* return 0 and continue with empty commit to skip such READ
+ * without more BRW errors.
+ */
+ RETURN(0);
+ }
+ if (lu_object_is_dying(&mo->mot_header)) {
+ CDEBUG_LIMIT(level,
+ "%s: READ IO to stale obj "DFID": rc = %d\n",
+ exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
+ -ESTALE);
+ /* return 0 and continue with empty commit to skip such READ
+ * without more BRW errors.
+ */
+ RETURN(0);
+ }
dob = mdt_obj2dt(mo);
/* parse remote buffers to local buffers and prepare the latter */
- *nr_local = 0;
for (i = 0, j = 0; i < niocount; i++) {
rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 0);
if (unlikely(rc < 0))
RETURN(0);
buf_put:
dt_bufs_put(env, dob, lnb, *nr_local);
-unlock:
mdt_dom_read_unlock(mo);
return rc;
}
tgt_grant_prepare_write(env, exp, oa, rnb, obj->ioo_bufcnt);
mdt_dom_read_lock(mo);
+ *nr_local = 0;
+ /* don't report error in cases with failed export */
if (!mdt_object_exists(mo)) {
- CDEBUG(D_ERROR, "%s: BRW to missing obj "DFID"\n",
- exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)));
- GOTO(unlock, rc = -ENOENT);
+ int level = exp->exp_failed ? D_INFO : D_ERROR;
+
+ rc = -ENOENT;
+ CDEBUG_LIMIT(level,
+ "%s: WRITE IO to missing obj "DFID": rc = %d\n",
+ exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)),
+ rc);
+ /* exit with no data written, note nr_local = 0 above */
+ GOTO(unlock, rc);
+ }
+ if (lu_object_is_dying(&mo->mot_header)) {
+ /* This is possible race between object destroy followed by
+ * discard BL AST and client cache flushing. Object is
+ * referenced until discard finish.
+ */
+ CDEBUG(D_INODE, "WRITE IO to stale object "DFID"\n",
+ PFID(mdt_object_fid(mo)));
+ /* Note: continue with no error here to don't cause BRW errors
+ * but skip transaction in commitrw silently so no data is
+ * written.
+ */
}
dob = mdt_obj2dt(mo);
/* parse remote buffers to local buffers and prepare the latter */
- *nr_local = 0;
for (i = 0, j = 0; i < obj->ioo_bufcnt; i++) {
rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 1);
if (unlikely(rc < 0))
ENTRY;
- LASSERT(niocount > 0);
-
dob = mdt_obj2dt(mo);
- dt_bufs_put(env, dob, lnb, niocount);
+ if (niocount)
+ dt_bufs_put(env, dob, lnb, niocount);
mdt_dom_read_unlock(mo);
RETURN(rc);
retry:
if (!dt_object_exists(dob))
GOTO(out, rc = -ENOENT);
+ if (lu_object_is_dying(&mo->mot_header)) {
+ /* Commit to stale object can be just skipped silently. */
+ CDEBUG(D_INODE, "skip commit to stale object "DFID"\n",
+ PFID(mdt_object_fid(mo)));
+ GOTO(out, rc = 0);
+ }
+
+ if (niocount == 0) {
+ rc = -EPROTO;
+ DEBUG_REQ(D_WARNING, tgt_ses_req(tgt_ses_info(env)),
+ "%s: commit with no pages for "DFID": rc = %d\n",
+ exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)), rc);
+ GOTO(out, rc);
+ }
th = dt_trans_create(env, dt);
if (IS_ERR(th))
__u64 valid;
int rc = 0;
- if (npages == 0) {
- CERROR("%s: no pages to commit\n",
- exp->exp_obd->obd_name);
- rc = -EPROTO;
- }
-
LASSERT(mo);
if (cmd == OBD_BRW_WRITE) {
} else {
rc = -EPROTO;
}
- /* this put is pair to object_get in ofd_preprw_write */
mdt_thread_info_fini(info);
RETURN(rc);
}
RETURN(rc);
}
-void mdt_dom_discard_data(struct mdt_thread_info *info,
- const struct lu_fid *fid)
-{
- struct mdt_device *mdt = info->mti_mdt;
- union ldlm_policy_data *policy = &info->mti_policy;
- struct ldlm_res_id *res_id = &info->mti_res_id;
- struct lustre_handle dom_lh;
- __u64 flags = LDLM_FL_AST_DISCARD_DATA;
- int rc = 0;
-
- policy->l_inodebits.bits = MDS_INODELOCK_DOM;
- policy->l_inodebits.try_bits = 0;
- fid_build_reg_res_name(fid, res_id);
-
- /* Tell the clients that the object is gone now and that they should
- * throw away any cached pages. */
- rc = ldlm_cli_enqueue_local(info->mti_env, mdt->mdt_namespace, res_id,
- LDLM_IBITS, policy, LCK_PW, &flags,
- ldlm_blocking_ast, ldlm_completion_ast,
- NULL, NULL, 0, LVB_T_NONE, NULL, &dom_lh);
-
- /* We only care about the side-effects, just drop the lock. */
- if (rc == ELDLM_OK)
- ldlm_lock_decref_and_cancel(&dom_lh, LCK_PW);
-}
-
/* check if client has already DoM lock for given resource */
bool mdt_dom_client_has_lock(struct mdt_thread_info *info,
const struct lu_fid *fid)
RETURN(0);
}
+/**
+ * Completion AST for DOM discard locks:
+ *
+ * CP AST an DOM discard lock is called always right after enqueue or from
+ * reprocess if lock was blocked, in the latest case l_ast_data is set to
+ * the mdt_object which is kept while there are pending locks on it.
+ */
+int ldlm_dom_discard_cp_ast(struct ldlm_lock *lock, __u64 flags, void *data)
+{
+ struct mdt_object *mo;
+ struct lustre_handle dom_lh;
+ struct lu_env *env;
+
+ ENTRY;
+
+ /* l_ast_data is set when lock was not granted immediately
+ * in mdt_dom_discard_data() below but put into waiting list,
+ * so this CP callback means we are finished and corresponding
+ * MDT object should be released finally as well as lock itself.
+ */
+ lock_res_and_lock(lock);
+ if (!lock->l_ast_data) {
+ unlock_res_and_lock(lock);
+ RETURN(0);
+ }
+
+ mo = lock->l_ast_data;
+ lock->l_ast_data = NULL;
+ unlock_res_and_lock(lock);
+
+ ldlm_lock2handle(lock, &dom_lh);
+ ldlm_lock_decref(&dom_lh, LCK_PW);
+
+ env = lu_env_find();
+ LASSERT(env);
+ mdt_object_put(env, mo);
+
+ RETURN(0);
+}
+
+void mdt_dom_discard_data(struct mdt_thread_info *info,
+ struct mdt_object *mo)
+{
+ struct ptlrpc_request *req = mdt_info_req(info);
+ struct mdt_device *mdt = mdt_dev(mo->mot_obj.lo_dev);
+ union ldlm_policy_data policy;
+ struct ldlm_res_id res_id;
+ struct lustre_handle dom_lh;
+ struct ldlm_lock *lock;
+ __u64 flags = LDLM_FL_AST_DISCARD_DATA;
+ int rc = 0;
+ bool old_client;
+
+ ENTRY;
+
+ if (req && req_is_replay(req))
+ RETURN_EXIT;
+
+ policy.l_inodebits.bits = MDS_INODELOCK_DOM;
+ policy.l_inodebits.try_bits = 0;
+ fid_build_reg_res_name(mdt_object_fid(mo), &res_id);
+
+ /* Keep blocking version of discard for an old client to avoid
+ * crashes on non-patched clients. LU-11359.
+ */
+ old_client = req && !(exp_connect_flags2(req->rq_export) &
+ OBD_CONNECT2_ASYNC_DISCARD);
+
+ /* Tell the clients that the object is gone now and that they should
+ * throw away any cached pages. */
+ rc = ldlm_cli_enqueue_local(info->mti_env, mdt->mdt_namespace, &res_id,
+ LDLM_IBITS, &policy, LCK_PW, &flags,
+ ldlm_blocking_ast, old_client ?
+ ldlm_completion_ast :
+ ldlm_dom_discard_cp_ast,
+ NULL, NULL, 0, LVB_T_NONE, NULL, &dom_lh);
+ if (rc != ELDLM_OK) {
+ CDEBUG(D_DLMTRACE,
+ "Failed to issue discard lock, rc = %d\n", rc);
+ RETURN_EXIT;
+ }
+
+ lock = ldlm_handle2lock(&dom_lh);
+ lock_res_and_lock(lock);
+ /* if lock is not granted then there are BL ASTs in progress and
+ * lock will be granted in result of reprocessing with CP callback
+ * notifying about that. The mdt object has to be kept until that and
+ * it is saved in l_ast_data of the lock. Lock reference is kept too
+ * until that to prevent it from canceling.
+ */
+ if (!is_granted_or_cancelled_nolock(lock)) {
+ mdt_object_get(info->mti_env, mo);
+ lock->l_ast_data = mo;
+ unlock_res_and_lock(lock);
+ } else {
+ unlock_res_and_lock(lock);
+ ldlm_lock_decref_and_cancel(&dom_lh, LCK_PW);
+ }
+ LDLM_LOCK_PUT(lock);
+
+ RETURN_EXIT;
+}
int rc = 0;
u64 open_flags;
u64 intent;
- bool discard = false;
ENTRY;
if (!MFD_CLOSED(open_flags)) {
rc = mo_close(info->mti_env, next, ma, open_flags);
- discard = mdt_dom_check_for_discard(info, o);
+ if (mdt_dom_check_for_discard(info, o))
+ mdt_dom_discard_data(info, o);
}
/* adjust open and lease count */
mdt_mfd_free(mfd);
mdt_object_put(info->mti_env, o);
- if (discard)
- mdt_dom_discard_data(info, ofid);
-
RETURN(rc);
}
struct mdt_lock_handle *child_lh;
struct ldlm_enqueue_info *einfo = &info->mti_einfo[0];
__u64 lock_ibits;
- bool cos_incompat = false, discard = false;
+ bool cos_incompat = false;
int no_name = 0;
int rc;
rc = mdt_attr_get_complex(info, mc, ma);
if (rc)
GOTO(out_stat, rc);
- } else {
- discard = mdt_dom_check_for_discard(info, mc);
+ } else if (mdt_dom_check_for_discard(info, mc)) {
+ mdt_dom_discard_data(info, mc);
}
mdt_handle_last_unlink(info, mc, ma);
mdt_object_unlock(info, mp, parent_lh, rc);
put_parent:
mdt_object_put(info->mti_env, mp);
-
- /* discard is just a PW DOM lock to drop the data on a client
- * no need to keep objects being get and locked, do that after all.
- */
- if (discard)
- mdt_dom_discard_data(info, child_fid);
-
return rc;
}
struct lu_fid *old_fid = &info->mti_tmp_fid1;
struct lu_fid *new_fid = &info->mti_tmp_fid2;
__u64 lock_ibits;
- bool reverse = false;
- bool cos_incompat, discard = false;
+ bool reverse = false, discard = false;
+ bool cos_incompat;
int rc;
ENTRY;
mdt_handle_last_unlink(info, mnew, ma);
discard = mdt_dom_check_for_discard(info, mnew);
}
-
mdt_rename_counter_tally(info, info->mti_mdt, req,
msrcdir, mtgtdir);
}
out_unlock_old:
mdt_object_unlock(info, mold, lh_oldp, rc);
out_put_new:
- if (mnew != NULL)
+ if (mnew && !discard)
mdt_object_put(info->mti_env, mnew);
out_put_old:
mdt_object_put(info->mti_env, mold);
out_put_srcdir:
mdt_object_put(info->mti_env, msrcdir);
- /* If 'discard' is set then new_fid must exits.
- * DOM data discard need neither object nor lock,
- * so do this at the end.
+ /* The DoM discard can be done right in the place above where it is
+ * assigned, meanwhile it is done here after rename unlock due to
+ * compatibility with old clients, for them the discard blocks
+ * the main thread until completion. Check LU-11359 for details.
*/
- if (discard)
- mdt_dom_discard_data(info, new_fid);
-
+ if (discard) {
+ mdt_dom_discard_data(info, mnew);
+ mdt_object_put(info->mti_env, mnew);
+ }
return rc;
}
"lsom", /* 0x800 */
"pcc", /* 0x1000 */
"plain_layout", /* 0x2000 */
+ "async_discard", /* 0x4000 */
NULL
};
/* the only discarder is lock cancelling, so
* [start, end] must contain this extent */
EASSERT(ext->oe_start >= start &&
- ext->oe_max_end <= end, ext);
+ ext->oe_end <= end, ext);
osc_extent_state_set(ext, OES_LOCKING);
ext->oe_owner = current;
list_move_tail(&ext->oe_link,
struct ptlrpc_hr_thread *hrt = (struct ptlrpc_hr_thread *)arg;
struct ptlrpc_hr_partition *hrp = hrt->hrt_partition;
struct list_head replies;
+ struct lu_env *env;
int rc;
+ OBD_ALLOC_PTR(env);
+ if (env == NULL)
+ RETURN(-ENOMEM);
+
INIT_LIST_HEAD(&replies);
unshare_fs_struct();
threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc);
}
+ rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD |
+ LCT_REMEMBER | LCT_NOREF);
+ if (rc)
+ GOTO(out_env, rc);
+
+ rc = lu_env_add(env);
+ if (rc)
+ GOTO(out_ctx_fini, rc);
+
atomic_inc(&hrp->hrp_nstarted);
wake_up(&ptlrpc_hr.hr_waitq);
struct ptlrpc_reply_state,
rs_list);
list_del_init(&rs->rs_list);
+ /* refill keys if needed */
+ lu_env_refill(env);
+ lu_context_enter(&env->le_ctx);
ptlrpc_handle_rs(rs);
+ lu_context_exit(&env->le_ctx);
}
}
atomic_inc(&hrp->hrp_nstopped);
wake_up(&ptlrpc_hr.hr_waitq);
+ lu_env_remove(env);
+out_ctx_fini:
+ lu_context_fini(&env->le_ctx);
+out_env:
+ OBD_FREE_PTR(env);
return 0;
}
#include <lustre_net.h>
#include <lustre_disk.h>
#include <uapi/linux/lustre/lustre_lfsck_user.h>
+#include <uapi/linux/lustre/lustre_cfg.h>
#include <uapi/linux/lustre/lustre_lfsck_user.h>
#include <uapi/linux/lustre/lustre_cfg.h>
+
void lustre_assert_wire_constants(void)
{
/* Wire protocol assertions generated by 'wirecheck'
OBD_CONNECT2_PCC);
LASSERTF(OBD_CONNECT2_PLAIN_LAYOUT == 0x2000ULL, "found 0x%.16llxULL\n",
OBD_CONNECT2_PLAIN_LAYOUT);
+ LASSERTF(OBD_CONNECT2_ASYNC_DISCARD == 0x4000ULL, "found 0x%.16llxULL\n",
+ OBD_CONNECT2_ASYNC_DISCARD);
LASSERTF(OBD_CKSUM_CRC32 == 0x00000001UL, "found 0x%.8xUL\n",
(unsigned)OBD_CKSUM_CRC32);
LASSERTF(OBD_CKSUM_ADLER == 0x00000002UL, "found 0x%.8xUL\n",
}
run_test 271f "DoM: read on open (200K file and read tail)"
+test_271g() {
+ [[ $($LCTL get_param mdc.*.import) =~ async_discard ]] ||
+ skip "Skipping due to old client or server version"
+
+ $LFS setstripe -E 1024K -L mdt -E EOF $DIR1/$tfile
+ # to get layout
+ $CHECKSTAT -t file $DIR1/$tfile
+
+ $MULTIOP $DIR1/$tfile Ow40960_w4096c &
+ MULTIOP_PID=$!
+ sleep 1
+ #define OBD_FAIL_LDLM_CANCEL_BL_CB_RACE
+ $LCTL set_param fail_loc=0x80000314
+ rm $DIR1/$tfile || error "Unlink fails"
+ RC=$?
+ kill -USR1 $MULTIOP_PID && wait $MULTIOP_PID || error "multiop failure"
+ [ $RC -eq 0 ] || error "Failed write to stale object"
+}
+run_test 271g "Discard DoM data vs client flush race"
+
test_272a() {
[ $MDS1_VERSION -lt $(version_code 2.11.50) ] &&
skip "Need MDS version at least 2.11.50"
CHECK_DEFINE_64X(OBD_CONNECT2_LSOM);
CHECK_DEFINE_64X(OBD_CONNECT2_PCC);
CHECK_DEFINE_64X(OBD_CONNECT2_PLAIN_LAYOUT);
+ CHECK_DEFINE_64X(OBD_CONNECT2_ASYNC_DISCARD);
CHECK_VALUE_X(OBD_CKSUM_CRC32);
CHECK_VALUE_X(OBD_CKSUM_ADLER);
check_lustre_cfg();
- printf("}\n\n");
+ printf("}\n");
return 0;
}
#include <linux/lustre/lustre_lfsck_user.h>
#include <linux/lustre/lustre_disk.h>
#endif
+#include <linux/lustre/lustre_cfg.h>
#define LASSERT(cond) if (!(cond)) { printf("failed " #cond "\n"); ret = 1; }
#define LASSERTF(cond, fmt, ...) if (!(cond)) { printf("failed '" #cond "'" fmt, ## __VA_ARGS__);ret = 1;}
OBD_CONNECT2_PCC);
LASSERTF(OBD_CONNECT2_PLAIN_LAYOUT == 0x2000ULL, "found 0x%.16llxULL\n",
OBD_CONNECT2_PLAIN_LAYOUT);
+ LASSERTF(OBD_CONNECT2_ASYNC_DISCARD == 0x4000ULL, "found 0x%.16llxULL\n",
+ OBD_CONNECT2_ASYNC_DISCARD);
LASSERTF(OBD_CKSUM_CRC32 == 0x00000001UL, "found 0x%.8xUL\n",
(unsigned)OBD_CKSUM_CRC32);
LASSERTF(OBD_CKSUM_ADLER == 0x00000002UL, "found 0x%.8xUL\n",
git://git.whamcloud.com / fs / lustre-release.git / commitdiff