*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2013, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/fid/fid_handler.c
*
#include <obd.h>
#include <obd_class.h>
#include <dt_object.h>
-#include <md_object.h>
#include <obd_support.h>
#include <lustre_req_layout.h>
#include <lustre_fid.h>
#include "fid_internal.h"
-static void seq_server_proc_fini(struct lu_server_seq *seq);
-
/* Assigns client to sequence controller node. */
-int seq_server_set_cli(struct lu_server_seq *seq,
- struct lu_client_seq *cli,
- const struct lu_env *env)
+int seq_server_set_cli(const struct lu_env *env, struct lu_server_seq *seq,
+ struct lu_client_seq *cli)
{
- int rc = 0;
- ENTRY;
+ int rc = 0;
+ ENTRY;
- /*
- * Ask client for new range, assign that range to ->seq_space and write
- * seq state to backing store should be atomic.
- */
+ /*
+ * Ask client for new range, assign that range to ->seq_space and write
+ * seq state to backing store should be atomic.
+ */
mutex_lock(&seq->lss_mutex);
- if (cli == NULL) {
- CDEBUG(D_INFO, "%s: Detached sequence client %s\n",
- seq->lss_name, cli->lcs_name);
- seq->lss_cli = cli;
- GOTO(out_up, rc = 0);
- }
+ if (!cli) {
+ CDEBUG(D_INFO, "%s: Detached sequence client\n", seq->lss_name);
+ seq->lss_cli = NULL;
+ GOTO(out_up, rc = 0);
+ }
- if (seq->lss_cli != NULL) {
- CDEBUG(D_HA, "%s: Sequence controller is already "
- "assigned\n", seq->lss_name);
+ if (seq->lss_cli) {
+ CDEBUG(D_HA, "%s: Sequence controller is already assigned\n",
+ seq->lss_name);
GOTO(out_up, rc = -EEXIST);
}
- CDEBUG(D_INFO, "%s: Attached sequence controller %s\n",
- seq->lss_name, cli->lcs_name);
+ CDEBUG(D_INFO, "%s: Attached sequence controller %s\n",
+ seq->lss_name, cli->lcs_name);
seq->lss_cli = cli;
cli->lcs_space.lsr_index = seq->lss_site->ss_node_id;
EXIT;
out_up:
mutex_unlock(&seq->lss_mutex);
- return rc;
+ return rc;
}
EXPORT_SYMBOL(seq_server_set_cli);
/*
* allocate \a w units of sequence from range \a from.
*/
static inline void range_alloc(struct lu_seq_range *to,
- struct lu_seq_range *from,
- __u64 width)
+ struct lu_seq_range *from,
+ __u64 width)
{
- width = min(range_space(from), width);
- to->lsr_start = from->lsr_start;
- to->lsr_end = from->lsr_start + width;
- from->lsr_start += width;
+ width = min(lu_seq_range_space(from), width);
+ to->lsr_start = from->lsr_start;
+ to->lsr_end = from->lsr_start + width;
+ from->lsr_start += width;
}
/**
*/
static int __seq_server_alloc_super(struct lu_server_seq *seq,
- struct lu_seq_range *out,
- const struct lu_env *env)
+ struct lu_seq_range *out,
+ const struct lu_env *env)
{
struct lu_seq_range *space = &seq->lss_space;
int rc;
ENTRY;
- LASSERT(range_is_sane(space));
+ LASSERT(lu_seq_range_is_sane(space));
- if (range_is_exhausted(space)) {
+ if (lu_seq_range_is_exhausted(space)) {
CERROR("%s: Sequences space is exhausted\n",
seq->lss_name);
RETURN(-ENOSPC);
}
int seq_server_alloc_super(struct lu_server_seq *seq,
- struct lu_seq_range *out,
- const struct lu_env *env)
+ struct lu_seq_range *out,
+ const struct lu_env *env)
{
- int rc;
- ENTRY;
+ int rc;
+ ENTRY;
mutex_lock(&seq->lss_mutex);
- rc = __seq_server_alloc_super(seq, out, env);
+ rc = __seq_server_alloc_super(seq, out, env);
+ mutex_unlock(&seq->lss_mutex);
+
+ RETURN(rc);
+}
+
+int seq_server_alloc_spec(struct lu_server_seq *seq,
+ struct lu_seq_range *spec,
+ const struct lu_env *env)
+{
+ struct lu_seq_range *space = &seq->lss_space;
+ int rc = -ENOSPC;
+ ENTRY;
+
+ /*
+ * In some cases (like recovery after a disaster)
+ * we may need to allocate sequences manually
+ * Notice some sequences can be lost if requested
+ * range doesn't start at the beginning of current
+ * free space. Also notice it's not possible now
+ * to allocate sequences out of natural order.
+ */
+ if (spec->lsr_start >= spec->lsr_end)
+ RETURN(-EINVAL);
+ if (spec->lsr_flags != LU_SEQ_RANGE_MDT &&
+ spec->lsr_flags != LU_SEQ_RANGE_OST)
+ RETURN(-EINVAL);
+
+ mutex_lock(&seq->lss_mutex);
+ if (spec->lsr_start >= space->lsr_start) {
+ space->lsr_start = spec->lsr_end;
+ rc = seq_store_update(env, seq, spec, 1 /* sync */);
+
+ LCONSOLE_INFO("%s: "DRANGE" sequences allocated: rc = %d \n",
+ seq->lss_name, PRANGE(spec), rc);
+ }
mutex_unlock(&seq->lss_mutex);
- RETURN(rc);
+ RETURN(rc);
}
static int __seq_set_init(const struct lu_env *env,
- struct lu_server_seq *seq)
+ struct lu_server_seq *seq)
{
- struct lu_seq_range *space = &seq->lss_space;
- int rc;
+ struct lu_seq_range *space = &seq->lss_space;
+ int rc;
- range_alloc(&seq->lss_lowater_set, space, seq->lss_set_width);
- range_alloc(&seq->lss_hiwater_set, space, seq->lss_set_width);
+ range_alloc(&seq->lss_lowater_set, space, seq->lss_set_width);
+ range_alloc(&seq->lss_hiwater_set, space, seq->lss_set_width);
- rc = seq_store_update(env, seq, NULL, 1);
+ rc = seq_store_update(env, seq, NULL, 1);
- return rc;
+ return rc;
}
/*
*
* when lss_lowater_set reaches the end it is replaced with hiwater one and
* a write operation is initiated to allocate new hiwater range.
- * if last seq write opearion is still not commited, current operation is
+ * if last seq write opearion is still not committed, current operation is
* flaged as sync write op.
*/
static int range_alloc_set(const struct lu_env *env,
- struct lu_seq_range *out,
- struct lu_server_seq *seq)
+ struct lu_seq_range *out,
+ struct lu_server_seq *seq)
{
- struct lu_seq_range *space = &seq->lss_space;
- struct lu_seq_range *loset = &seq->lss_lowater_set;
- struct lu_seq_range *hiset = &seq->lss_hiwater_set;
- int rc = 0;
+ struct lu_seq_range *space = &seq->lss_space;
+ struct lu_seq_range *loset = &seq->lss_lowater_set;
+ struct lu_seq_range *hiset = &seq->lss_hiwater_set;
+ int rc = 0;
- if (range_is_zero(loset))
- __seq_set_init(env, seq);
+ if (lu_seq_range_is_zero(loset))
+ __seq_set_init(env, seq);
- if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_ALLOC)) /* exhaust set */
- loset->lsr_start = loset->lsr_end;
+ if (CFS_FAIL_CHECK(OBD_FAIL_SEQ_ALLOC)) /* exhaust set */
+ loset->lsr_start = loset->lsr_end;
- if (range_is_exhausted(loset)) {
- /* reached high water mark. */
+ if (lu_seq_range_is_exhausted(loset)) {
+ /* reached high water mark. */
struct lu_device *dev = seq->lss_site->ss_lu->ls_top_dev;
- int obd_num_clients = dev->ld_obd->obd_num_exports;
- __u64 set_sz;
+ int obd_num_clients = dev->ld_obd->obd_num_exports;
+ __u64 set_sz;
- /* calculate new seq width based on number of clients */
- set_sz = max(seq->lss_set_width,
- obd_num_clients * seq->lss_width);
- set_sz = min(range_space(space), set_sz);
+ /* calculate new seq width based on number of clients */
+ set_sz = max(seq->lss_set_width,
+ obd_num_clients * seq->lss_width);
+ set_sz = min(lu_seq_range_space(space), set_sz);
- /* Switch to hiwater range now */
- *loset = *hiset;
- /* allocate new hiwater range */
- range_alloc(hiset, space, set_sz);
+ /* Switch to hiwater range now */
+ *loset = *hiset;
+ /* allocate new hiwater range */
+ range_alloc(hiset, space, set_sz);
- /* update ondisk seq with new *space */
- rc = seq_store_update(env, seq, NULL, seq->lss_need_sync);
- }
+ /* update ondisk seq with new *space */
+ rc = seq_store_update(env, seq, NULL, seq->lss_need_sync);
+ }
- LASSERTF(!range_is_exhausted(loset) || range_is_sane(loset),
- DRANGE"\n", PRANGE(loset));
+ LASSERTF(!lu_seq_range_is_exhausted(loset) ||
+ lu_seq_range_is_sane(loset),
+ DRANGE"\n", PRANGE(loset));
- if (rc == 0)
- range_alloc(out, loset, seq->lss_width);
+ if (rc == 0)
+ range_alloc(out, loset, seq->lss_width);
- RETURN(rc);
+ RETURN(rc);
}
-static int __seq_server_alloc_meta(struct lu_server_seq *seq,
- struct lu_seq_range *out,
- const struct lu_env *env)
+/**
+ * Check if the sequence server has sequence avaible
+ *
+ * Check if the sequence server has sequence avaible, if not, then
+ * allocating super sequence from sequence manager (MDT0).
+ *
+ * \param[in] env execution environment
+ * \param[in] seq server sequence
+ *
+ * \retval negative errno if allocating new sequence fails
+ * \retval 0 if there is enough sequence or allocating
+ * new sequence succeeds
+ */
+int seq_server_check_and_alloc_super(const struct lu_env *env,
+ struct lu_server_seq *seq)
{
struct lu_seq_range *space = &seq->lss_space;
int rc = 0;
ENTRY;
- LASSERT(range_is_sane(space));
-
/* Check if available space ends and allocate new super seq */
- if (range_is_exhausted(space)) {
+ if (lu_seq_range_is_exhausted(space)) {
if (!seq->lss_cli) {
CERROR("%s: No sequence controller is attached.\n",
seq->lss_name);
rc = seq_client_alloc_super(seq->lss_cli, env);
if (rc) {
- CERROR("%s: Can't allocate super-sequence, rc %d\n",
+ CDEBUG(D_HA,
+ "%s: Can't allocate super-sequence: rc = %d\n",
seq->lss_name, rc);
RETURN(rc);
}
/* Saving new range to allocation space. */
*space = seq->lss_cli->lcs_space;
- LASSERT(range_is_sane(space));
+ LASSERT(lu_seq_range_is_sane(space));
+ if (!seq->lss_cli->lcs_srv) {
+ struct lu_server_fld *fld;
+
+ /* Insert it to the local FLDB */
+ fld = seq->lss_site->ss_server_fld;
+ mutex_lock(&fld->lsf_lock);
+ rc = fld_insert_entry(env, fld, space);
+ mutex_unlock(&fld->lsf_lock);
+ }
+ }
+
+ if (lu_seq_range_is_zero(&seq->lss_lowater_set))
+ __seq_set_init(env, seq);
+
+ RETURN(rc);
+}
+EXPORT_SYMBOL(seq_server_check_and_alloc_super);
+
+static int __seq_server_alloc_meta(struct lu_server_seq *seq,
+ struct lu_seq_range *out,
+ const struct lu_env *env)
+{
+ struct lu_seq_range *space = &seq->lss_space;
+ int rc = 0;
+
+ ENTRY;
+
+ LASSERT(lu_seq_range_is_sane(space));
+
+ rc = seq_server_check_and_alloc_super(env, seq);
+ if (rc < 0) {
+ if (rc == -EINPROGRESS) {
+ static int printed;
+
+ if (printed++ % 8 == 0)
+ LCONSOLE_INFO("%s: Waiting to contact MDT0000 to allocate super-sequence: rc = %d\n",
+ seq->lss_name, rc);
+ } else {
+ CERROR("%s: Allocated super-sequence failed: rc = %d\n",
+ seq->lss_name, rc);
+ }
+ RETURN(rc);
}
rc = range_alloc_set(env, out, seq);
if (rc != 0) {
CERROR("%s: Allocated meta-sequence failed: rc = %d\n",
- seq->lss_name, rc);
+ seq->lss_name, rc);
RETURN(rc);
}
CDEBUG(D_INFO, "%s: Allocated meta-sequence " DRANGE"\n",
- seq->lss_name, PRANGE(out));
+ seq->lss_name, PRANGE(out));
RETURN(rc);
}
int seq_server_alloc_meta(struct lu_server_seq *seq,
- struct lu_seq_range *out,
- const struct lu_env *env)
+ struct lu_seq_range *out,
+ const struct lu_env *env)
{
- int rc;
- ENTRY;
+ int rc;
+ ENTRY;
mutex_lock(&seq->lss_mutex);
- rc = __seq_server_alloc_meta(seq, out, env);
+ rc = __seq_server_alloc_meta(seq, out, env);
mutex_unlock(&seq->lss_mutex);
- RETURN(rc);
+ RETURN(rc);
}
EXPORT_SYMBOL(seq_server_alloc_meta);
static int seq_server_handle(struct lu_site *site,
- const struct lu_env *env,
- __u32 opc, struct lu_seq_range *out)
+ const struct lu_env *env,
+ __u32 opc, struct lu_seq_range *out)
{
int rc;
struct seq_server_site *ss_site;
+ struct dt_device *dev;
ENTRY;
ss_site = lu_site2seq(site);
switch (opc) {
case SEQ_ALLOC_META:
if (!ss_site->ss_server_seq) {
- CERROR("Sequence server is not "
- "initialized\n");
- RETURN(-EINVAL);
+ rc = -EINVAL;
+ CERROR("Sequence server is not initialized: rc = %d\n",
+ rc);
+ RETURN(rc);
}
+
+ dev = lu2dt_dev(ss_site->ss_server_seq->lss_obj->do_lu.lo_dev);
+ if (dev->dd_rdonly)
+ RETURN(-EROFS);
+
rc = seq_server_alloc_meta(ss_site->ss_server_seq, out, env);
break;
case SEQ_ALLOC_SUPER:
if (!ss_site->ss_control_seq) {
- CERROR("Sequence controller is not "
- "initialized\n");
- RETURN(-EINVAL);
+ rc = -EINVAL;
+ CERROR("Sequence controller is not initialized: rc = %d\n",
+ rc);
+ RETURN(rc);
}
+
+ dev = lu2dt_dev(ss_site->ss_control_seq->lss_obj->do_lu.lo_dev);
+ if (dev->dd_rdonly)
+ RETURN(-EROFS);
+
rc = seq_server_alloc_super(ss_site->ss_control_seq, out, env);
break;
default:
LASSERT(site != NULL);
opc = req_capsule_client_get(tsi->tsi_pill, &RMF_SEQ_OPC);
- if (opc != NULL) {
+ if (opc) {
out = req_capsule_server_get(tsi->tsi_pill, &RMF_SEQ_RANGE);
- if (out == NULL)
+ if (!out)
RETURN(err_serious(-EPROTO));
tmp = req_capsule_client_get(tsi->tsi_pill, &RMF_SEQ_RANGE);
- /* seq client passed mdt id, we need to pass that using out
- * range parameter */
-
+ /*
+ * seq client passed mdt id, we need to pass that using out
+ * range parameter
+ */
out->lsr_index = tmp->lsr_index;
out->lsr_flags = tmp->lsr_flags;
rc = seq_server_handle(site, tsi->tsi_env, *opc, out);
}
struct tgt_handler seq_handlers[] = {
-TGT_SEQ_HDL(HABEO_REFERO, SEQ_QUERY, seq_handler),
+TGT_SEQ_HDL(HAS_REPLY, SEQ_QUERY, seq_handler),
};
EXPORT_SYMBOL(seq_handlers);
/* context key: seq_thread_key */
LU_CONTEXT_KEY_DEFINE(seq, LCT_MD_THREAD | LCT_DT_THREAD);
-static int seq_server_proc_init(struct lu_server_seq *seq)
+static void seq_server_debugfs_fini(struct lu_server_seq *seq)
{
-#ifdef LPROCFS
-
- int rc;
- ENTRY;
-
- seq->lss_proc_dir = lprocfs_register(seq->lss_name,
- seq_type_proc_dir,
- NULL, NULL);
- if (IS_ERR(seq->lss_proc_dir)) {
- rc = PTR_ERR(seq->lss_proc_dir);
- RETURN(rc);
- }
-
- rc = lprocfs_add_vars(seq->lss_proc_dir,
- seq_server_proc_list, seq);
- if (rc) {
- CERROR("%s: Can't init sequence manager "
- "proc, rc %d\n", seq->lss_name, rc);
- GOTO(out_cleanup, rc);
- }
-
- RETURN(0);
-
-out_cleanup:
- seq_server_proc_fini(seq);
- return rc;
-#else /* LPROCFS */
- return 0;
-#endif
+ debugfs_remove_recursive(seq->lss_debugfs_entry);
}
-static void seq_server_proc_fini(struct lu_server_seq *seq)
+static void seq_server_debugfs_init(struct lu_server_seq *seq)
{
-#ifdef LPROCFS
- ENTRY;
- if (seq->lss_proc_dir != NULL) {
- if (!IS_ERR(seq->lss_proc_dir))
- lprocfs_remove(&seq->lss_proc_dir);
- seq->lss_proc_dir = NULL;
- }
- EXIT;
-#endif /* LPROCFS */
+ ENTRY;
+
+ seq->lss_debugfs_entry = debugfs_create_dir(seq->lss_name,
+ seq_debugfs_dir);
+
+ ldebugfs_add_vars(seq->lss_debugfs_entry,
+ seq_server_debugfs_list, seq);
+
+ if (seq->lss_type == LUSTRE_SEQ_CONTROLLER)
+ debugfs_create_file("fldb", 0644, seq->lss_debugfs_entry,
+ seq, &seq_fld_debugfs_seq_fops);
}
-int seq_server_init(struct lu_server_seq *seq,
+int seq_server_init(const struct lu_env *env,
+ struct lu_server_seq *seq,
struct dt_device *dev,
const char *prefix,
enum lu_mgr_type type,
- struct seq_server_site *ss,
- const struct lu_env *env)
+ struct seq_server_site *ss)
{
- int rc, is_srv = (type == LUSTRE_SEQ_SERVER);
- ENTRY;
+ int rc, is_srv = (type == LUSTRE_SEQ_SERVER);
+ ENTRY;
- LASSERT(dev != NULL);
- LASSERT(prefix != NULL);
+ LASSERT(dev != NULL);
+ LASSERT(prefix != NULL);
LASSERT(ss != NULL);
LASSERT(ss->ss_lu != NULL);
+ /*
+ * Check all lu_fid fields are converted in fid_cpu_to_le() and friends
+ * and that there is no padding added by compiler to the struct.
+ */
+ {
+ struct lu_fid tst;
+
+ BUILD_BUG_ON(sizeof(tst) != sizeof(tst.f_seq) +
+ sizeof(tst.f_oid) + sizeof(tst.f_ver));
+ }
+
seq->lss_cli = NULL;
seq->lss_type = type;
seq->lss_site = ss;
- range_init(&seq->lss_space);
+ lu_seq_range_init(&seq->lss_space);
- range_init(&seq->lss_lowater_set);
- range_init(&seq->lss_hiwater_set);
- seq->lss_set_width = LUSTRE_SEQ_BATCH_WIDTH;
+ lu_seq_range_init(&seq->lss_lowater_set);
+ lu_seq_range_init(&seq->lss_hiwater_set);
+ seq->lss_set_width = LUSTRE_SEQ_BATCH_WIDTH;
mutex_init(&seq->lss_mutex);
- seq->lss_width = is_srv ?
- LUSTRE_SEQ_META_WIDTH : LUSTRE_SEQ_SUPER_WIDTH;
+ seq->lss_width = is_srv ?
+ LUSTRE_SEQ_META_WIDTH : LUSTRE_SEQ_SUPER_WIDTH;
- snprintf(seq->lss_name, sizeof(seq->lss_name),
- "%s-%s", (is_srv ? "srv" : "ctl"), prefix);
+ snprintf(seq->lss_name, sizeof(seq->lss_name),
+ "%s-%s", (is_srv ? "srv" : "ctl"), prefix);
- rc = seq_store_init(seq, env, dev);
- if (rc)
- GOTO(out, rc);
- /* Request backing store for saved sequence info. */
- rc = seq_store_read(seq, env);
- if (rc == -ENODATA) {
+ rc = seq_store_init(seq, env, dev);
+ if (rc)
+ GOTO(out, rc);
+ /* Request backing store for saved sequence info. */
+ rc = seq_store_read(seq, env);
+ if (rc == -ENODATA) {
- /* Nothing is read, init by default value. */
- seq->lss_space = is_srv ?
- LUSTRE_SEQ_ZERO_RANGE:
- LUSTRE_SEQ_SPACE_RANGE;
+ /* Nothing is read, init by default value. */
+ seq->lss_space = is_srv ?
+ LUSTRE_SEQ_ZERO_RANGE :
+ LUSTRE_SEQ_SPACE_RANGE;
- LASSERT(ss != NULL);
seq->lss_space.lsr_index = ss->ss_node_id;
- LCONSOLE_INFO("%s: No data found "
- "on store. Initialize space\n",
+ LCONSOLE_INFO("%s: No data found on store. Initialize space.\n",
seq->lss_name);
- rc = seq_store_update(env, seq, NULL, 0);
- if (rc) {
- CERROR("%s: Can't write space data, "
- "rc %d\n", seq->lss_name, rc);
- }
- } else if (rc) {
- CERROR("%s: Can't read space data, rc %d\n",
- seq->lss_name, rc);
- GOTO(out, rc);
- }
-
- if (is_srv) {
- LASSERT(range_is_sane(&seq->lss_space));
- } else {
- LASSERT(!range_is_zero(&seq->lss_space) &&
- range_is_sane(&seq->lss_space));
- }
-
- rc = seq_server_proc_init(seq);
- if (rc)
- GOTO(out, rc);
-
- EXIT;
+ rc = seq_store_update(env, seq, NULL, 0);
+ if (rc) {
+ CERROR("%s: Can't write space data: rc = %d\n",
+ seq->lss_name, rc);
+ }
+ } else if (rc) {
+ CERROR("%s: Can't read space data: rc = %d\n",
+ seq->lss_name, rc);
+ GOTO(out, rc);
+ }
+
+ if (is_srv) {
+ LASSERT(lu_seq_range_is_sane(&seq->lss_space));
+ } else {
+ LASSERT(!lu_seq_range_is_zero(&seq->lss_space) &&
+ lu_seq_range_is_sane(&seq->lss_space));
+ }
+
+ seq_server_debugfs_init(seq);
+
+ EXIT;
out:
- if (rc)
- seq_server_fini(seq, env);
- return rc;
+ if (rc)
+ seq_server_fini(seq, env);
+ return rc;
}
EXPORT_SYMBOL(seq_server_init);
void seq_server_fini(struct lu_server_seq *seq,
- const struct lu_env *env)
+ const struct lu_env *env)
{
- ENTRY;
+ ENTRY;
- seq_server_proc_fini(seq);
- seq_store_fini(seq, env);
+ seq_server_debugfs_fini(seq);
+ seq_store_fini(seq, env);
- EXIT;
+ EXIT;
}
EXPORT_SYMBOL(seq_server_fini);
int seq_site_fini(const struct lu_env *env, struct seq_server_site *ss)
{
- if (ss == NULL)
+ if (!ss)
RETURN(0);
if (ss->ss_server_seq) {
git://git.whamcloud.com / fs / lustre-release.git / blobdiff