diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/llog.c')
-rw-r--r-- | drivers/staging/lustre/lustre/obdclass/llog.c | 214 |
1 files changed, 135 insertions, 79 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/llog.c b/drivers/staging/lustre/lustre/obdclass/llog.c index 0cb44287502b..e0dfb089dd90 100644 --- a/drivers/staging/lustre/lustre/obdclass/llog.c +++ b/drivers/staging/lustre/lustre/obdclass/llog.c @@ -62,7 +62,7 @@ struct llog_handle *llog_alloc_handle(void) OBD_ALLOC_PTR(loghandle); if (loghandle == NULL) - return ERR_PTR(-ENOMEM); + return NULL; init_rwsem(&loghandle->lgh_lock); spin_lock_init(&loghandle->lgh_hdr_lock); @@ -265,31 +265,6 @@ out: } EXPORT_SYMBOL(llog_init_handle); -int llog_copy_handler(const struct lu_env *env, - struct llog_handle *llh, - struct llog_rec_hdr *rec, - void *data) -{ - struct llog_rec_hdr local_rec = *rec; - struct llog_handle *local_llh = (struct llog_handle *)data; - char *cfg_buf = (char*) (rec + 1); - struct lustre_cfg *lcfg; - int rc = 0; - - /* Append all records */ - local_rec.lrh_len -= sizeof(*rec) + sizeof(struct llog_rec_tail); - rc = llog_write(env, local_llh, &local_rec, NULL, 0, - (void *)cfg_buf, -1); - - lcfg = (struct lustre_cfg *)cfg_buf; - CDEBUG(D_INFO, "idx=%d, rc=%d, len=%d, cmd %x %s %s\n", - rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command, - lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1)); - - return rc; -} -EXPORT_SYMBOL(llog_copy_handler); - static int llog_process_thread(void *arg) { struct llog_process_info *lpi = arg; @@ -493,14 +468,6 @@ int llog_process(const struct lu_env *env, struct llog_handle *loghandle, } EXPORT_SYMBOL(llog_process); -inline int llog_get_size(struct llog_handle *loghandle) -{ - if (loghandle && loghandle->lgh_hdr) - return loghandle->lgh_hdr->llh_count; - return 0; -} -EXPORT_SYMBOL(llog_get_size); - int llog_reverse_process(const struct lu_env *env, struct llog_handle *loghandle, llog_cb_t cb, void *data, void *catdata) @@ -767,8 +734,9 @@ int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt, struct llog_handle **res, struct llog_logid *logid, char *name) { - struct thandle *th; - int rc; + struct dt_device *d; + struct thandle *th; + int rc; rc = llog_open(env, ctxt, res, logid, name, LLOG_OPEN_NEW); if (rc) @@ -777,27 +745,21 @@ int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt, if (llog_exist(*res)) return 0; - if ((*res)->lgh_obj != NULL) { - struct dt_device *d; + LASSERT((*res)->lgh_obj != NULL); - d = lu2dt_dev((*res)->lgh_obj->do_lu.lo_dev); + d = lu2dt_dev((*res)->lgh_obj->do_lu.lo_dev); - th = dt_trans_create(env, d); - if (IS_ERR(th)) - GOTO(out, rc = PTR_ERR(th)); + th = dt_trans_create(env, d); + if (IS_ERR(th)) + GOTO(out, rc = PTR_ERR(th)); - rc = llog_declare_create(env, *res, th); - if (rc == 0) { - rc = dt_trans_start_local(env, d, th); - if (rc == 0) - rc = llog_create(env, *res, th); - } - dt_trans_stop(env, d, th); - } else { - /* lvfs compat code */ - LASSERT((*res)->lgh_file == NULL); - rc = llog_create(env, *res, NULL); + rc = llog_declare_create(env, *res, th); + if (rc == 0) { + rc = dt_trans_start_local(env, d, th); + if (rc == 0) + rc = llog_create(env, *res, th); } + dt_trans_stop(env, d, th); out: if (rc) llog_close(env, *res); @@ -842,41 +804,34 @@ int llog_write(const struct lu_env *env, struct llog_handle *loghandle, struct llog_rec_hdr *rec, struct llog_cookie *reccookie, int cookiecount, void *buf, int idx) { - int rc; + struct dt_device *dt; + struct thandle *th; + int rc; LASSERT(loghandle); LASSERT(loghandle->lgh_ctxt); + LASSERT(loghandle->lgh_obj != NULL); - if (loghandle->lgh_obj != NULL) { - struct dt_device *dt; - struct thandle *th; - - dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev); + dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev); - th = dt_trans_create(env, dt); - if (IS_ERR(th)) - return PTR_ERR(th); + th = dt_trans_create(env, dt); + if (IS_ERR(th)) + return PTR_ERR(th); - rc = llog_declare_write_rec(env, loghandle, rec, idx, th); - if (rc) - GOTO(out_trans, rc); + rc = llog_declare_write_rec(env, loghandle, rec, idx, th); + if (rc) + GOTO(out_trans, rc); - rc = dt_trans_start_local(env, dt, th); - if (rc) - GOTO(out_trans, rc); + rc = dt_trans_start_local(env, dt, th); + if (rc) + GOTO(out_trans, rc); - down_write(&loghandle->lgh_lock); - rc = llog_write_rec(env, loghandle, rec, reccookie, - cookiecount, buf, idx, th); - up_write(&loghandle->lgh_lock); + down_write(&loghandle->lgh_lock); + rc = llog_write_rec(env, loghandle, rec, reccookie, + cookiecount, buf, idx, th); + up_write(&loghandle->lgh_lock); out_trans: - dt_trans_stop(env, dt, th); - } else { /* lvfs compatibility */ - down_write(&loghandle->lgh_lock); - rc = llog_write_rec(env, loghandle, rec, reccookie, - cookiecount, buf, idx, NULL); - up_write(&loghandle->lgh_lock); - } + dt_trans_stop(env, dt, th); return rc; } EXPORT_SYMBOL(llog_write); @@ -932,3 +887,104 @@ out: return rc; } EXPORT_SYMBOL(llog_close); + +int llog_is_empty(const struct lu_env *env, struct llog_ctxt *ctxt, + char *name) +{ + struct llog_handle *llh; + int rc = 0; + + rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS); + if (rc < 0) { + if (likely(rc == -ENOENT)) + rc = 0; + GOTO(out, rc); + } + + rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL); + if (rc) + GOTO(out_close, rc); + rc = llog_get_size(llh); + +out_close: + llog_close(env, llh); +out: + /* header is record 1 */ + return rc <= 1; +} +EXPORT_SYMBOL(llog_is_empty); + +int llog_copy_handler(const struct lu_env *env, struct llog_handle *llh, + struct llog_rec_hdr *rec, void *data) +{ + struct llog_handle *copy_llh = data; + + /* Append all records */ + return llog_write(env, copy_llh, rec, NULL, 0, NULL, -1); +} +EXPORT_SYMBOL(llog_copy_handler); + +/* backup plain llog */ +int llog_backup(const struct lu_env *env, struct obd_device *obd, + struct llog_ctxt *ctxt, struct llog_ctxt *bctxt, + char *name, char *backup) +{ + struct llog_handle *llh, *bllh; + int rc; + + + + /* open original log */ + rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS); + if (rc < 0) { + /* the -ENOENT case is also reported to the caller + * but silently so it should handle that if needed. + */ + if (rc != -ENOENT) + CERROR("%s: failed to open log %s: rc = %d\n", + obd->obd_name, name, rc); + return rc; + } + + rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL); + if (rc) + GOTO(out_close, rc); + + /* Make sure there's no old backup log */ + rc = llog_erase(env, bctxt, NULL, backup); + if (rc < 0 && rc != -ENOENT) + GOTO(out_close, rc); + + /* open backup log */ + rc = llog_open_create(env, bctxt, &bllh, NULL, backup); + if (rc) { + CERROR("%s: failed to open backup logfile %s: rc = %d\n", + obd->obd_name, backup, rc); + GOTO(out_close, rc); + } + + /* check that backup llog is not the same object as original one */ + if (llh->lgh_obj == bllh->lgh_obj) { + CERROR("%s: backup llog %s to itself (%s), objects %p/%p\n", + obd->obd_name, name, backup, llh->lgh_obj, + bllh->lgh_obj); + GOTO(out_backup, rc = -EEXIST); + } + + rc = llog_init_handle(env, bllh, LLOG_F_IS_PLAIN, NULL); + if (rc) + GOTO(out_backup, rc); + + /* Copy log record by record */ + rc = llog_process_or_fork(env, llh, llog_copy_handler, (void *)bllh, + NULL, false); + if (rc) + CERROR("%s: failed to backup log %s: rc = %d\n", + obd->obd_name, name, rc); +out_backup: + llog_close(env, bllh); +out_close: + llog_close(env, llh); + return rc; +} +EXPORT_SYMBOL(llog_backup); |