diff options
Diffstat (limited to 'fs')
-rw-r--r-- | fs/xfs/xfs_log.c | 424 | ||||
-rw-r--r-- | fs/xfs/xfs_log_priv.h | 8 |
2 files changed, 196 insertions, 236 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index d1f4d9031df3..29e09a888f38 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2246,7 +2246,8 @@ xlog_write_full( { int index; - ASSERT(*log_offset + *len <= iclog->ic_size); + ASSERT(*log_offset + *len <= iclog->ic_size || + iclog->ic_state == XLOG_STATE_WANT_SYNC); /* * Ordered log vectors have no regions to write so this @@ -2262,111 +2263,177 @@ xlog_write_full( } } -static xlog_op_header_t * -xlog_write_setup_ophdr( - struct xlog_op_header *ophdr, - struct xlog_ticket *ticket) +static int +xlog_write_get_more_iclog_space( + struct xlog_ticket *ticket, + struct xlog_in_core **iclogp, + uint32_t *log_offset, + uint32_t len, + uint32_t *record_cnt, + uint32_t *data_cnt, + int *contwr) { - ophdr->oh_clientid = XFS_TRANSACTION; - ophdr->oh_res2 = 0; - ophdr->oh_flags = 0; - return ophdr; + struct xlog_in_core *iclog = *iclogp; + struct xlog *log = iclog->ic_log; + int error; + + spin_lock(&log->l_icloglock); + ASSERT(iclog->ic_state == XLOG_STATE_WANT_SYNC); + xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); + error = xlog_state_release_iclog(log, iclog); + spin_unlock(&log->l_icloglock); + if (error) + return error; + + error = xlog_state_get_iclog_space(log, len, &iclog, + ticket, contwr, log_offset); + if (error) + return error; + *record_cnt = 0; + *data_cnt = 0; + *iclogp = iclog; + return 0; } /* - * Set up the parameters of the region copy into the log. This has - * to handle region write split across multiple log buffers - this - * state is kept external to this function so that this code can - * be written in an obvious, self documenting manner. + * Write log vectors into a single iclog which is smaller than the current chain + * length. We write until we cannot fit a full record into the remaining space + * and then stop. We return the log vector that is to be written that cannot + * wholly fit in the iclog. */ static int -xlog_write_setup_copy( +xlog_write_partial( + struct xfs_log_vec *lv, struct xlog_ticket *ticket, - struct xlog_op_header *ophdr, - int space_available, - int space_required, - int *copy_off, - int *copy_len, - int *last_was_partial_copy, - int *bytes_consumed) -{ - int still_to_copy; - - still_to_copy = space_required - *bytes_consumed; - *copy_off = *bytes_consumed; - - if (still_to_copy <= space_available) { - /* write of region completes here */ - *copy_len = still_to_copy; - ophdr->oh_len = cpu_to_be32(*copy_len); - if (*last_was_partial_copy) - ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); - *last_was_partial_copy = 0; - *bytes_consumed = 0; - return 0; - } + struct xlog_in_core **iclogp, + uint32_t *log_offset, + uint32_t *len, + uint32_t *record_cnt, + uint32_t *data_cnt, + int *contwr) +{ + struct xlog_in_core *iclog = *iclogp; + struct xlog *log = iclog->ic_log; + struct xlog_op_header *ophdr; + int index = 0; + uint32_t rlen; + int error; - /* partial write of region, needs extra log op header reservation */ - *copy_len = space_available; - ophdr->oh_len = cpu_to_be32(*copy_len); - ophdr->oh_flags |= XLOG_CONTINUE_TRANS; - if (*last_was_partial_copy) - ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; - *bytes_consumed += *copy_len; - (*last_was_partial_copy)++; + /* walk the logvec, copying until we run out of space in the iclog */ + for (index = 0; index < lv->lv_niovecs; index++) { + struct xfs_log_iovec *reg = &lv->lv_iovecp[index]; + uint32_t reg_offset = 0; - /* account for new log op header */ - ticket->t_curr_res -= sizeof(struct xlog_op_header); + /* + * The first region of a continuation must have a non-zero + * length otherwise log recovery will just skip over it and + * start recovering from the next opheader it finds. Because we + * mark the next opheader as a continuation, recovery will then + * incorrectly add the continuation to the previous region and + * that breaks stuff. + * + * Hence if there isn't space for region data after the + * opheader, then we need to start afresh with a new iclog. + */ + if (iclog->ic_size - *log_offset <= + sizeof(struct xlog_op_header)) { + error = xlog_write_get_more_iclog_space(ticket, + &iclog, log_offset, *len, record_cnt, + data_cnt, contwr); + if (error) + return error; + } - return sizeof(struct xlog_op_header); -} + ophdr = reg->i_addr; + rlen = min_t(uint32_t, reg->i_len, iclog->ic_size - *log_offset); -static int -xlog_write_copy_finish( - struct xlog *log, - struct xlog_in_core *iclog, - uint flags, - int *record_cnt, - int *data_cnt, - int *partial_copy, - int *partial_copy_len, - int log_offset) -{ - int error; + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); + ophdr->oh_len = cpu_to_be32(rlen - sizeof(struct xlog_op_header)); + if (rlen != reg->i_len) + ophdr->oh_flags |= XLOG_CONTINUE_TRANS; + + xlog_verify_dest_ptr(log, iclog->ic_datap + *log_offset); + xlog_write_iovec(iclog, log_offset, reg->i_addr, + rlen, len, record_cnt, data_cnt); + + /* If we wrote the whole region, move to the next. */ + if (rlen == reg->i_len) + continue; - if (*partial_copy) { /* - * This iclog has already been marked WANT_SYNC by - * xlog_state_get_iclog_space. + * We now have a partially written iovec, but it can span + * multiple iclogs so we loop here. First we release the iclog + * we currently have, then we get a new iclog and add a new + * opheader. Then we continue copying from where we were until + * we either complete the iovec or fill the iclog. If we + * complete the iovec, then we increment the index and go right + * back to the top of the outer loop. if we fill the iclog, we + * run the inner loop again. + * + * This is complicated by the tail of a region using all the + * space in an iclog and hence requiring us to release the iclog + * and get a new one before returning to the outer loop. We must + * always guarantee that we exit this inner loop with at least + * space for log transaction opheaders left in the current + * iclog, hence we cannot just terminate the loop at the end + * of the of the continuation. So we loop while there is no + * space left in the current iclog, and check for the end of the + * continuation after getting a new iclog. */ - spin_lock(&log->l_icloglock); - xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); - *record_cnt = 0; - *data_cnt = 0; - goto release_iclog; - } + do { + /* + * Ensure we include the continuation opheader in the + * space we need in the new iclog by adding that size + * to the length we require. This continuation opheader + * needs to be accounted to the ticket as the space it + * consumes hasn't been accounted to the lv we are + * writing. + */ + error = xlog_write_get_more_iclog_space(ticket, + &iclog, log_offset, + *len + sizeof(struct xlog_op_header), + record_cnt, data_cnt, contwr); + if (error) + return error; + + ophdr = iclog->ic_datap + *log_offset; + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); + ophdr->oh_clientid = XFS_TRANSACTION; + ophdr->oh_res2 = 0; + ophdr->oh_flags = XLOG_WAS_CONT_TRANS; - *partial_copy = 0; - *partial_copy_len = 0; + ticket->t_curr_res -= sizeof(struct xlog_op_header); + *log_offset += sizeof(struct xlog_op_header); + *data_cnt += sizeof(struct xlog_op_header); - if (iclog->ic_size - log_offset > sizeof(xlog_op_header_t)) - return 0; + /* + * If rlen fits in the iclog, then end the region + * continuation. Otherwise we're going around again. + */ + reg_offset += rlen; + rlen = reg->i_len - reg_offset; + if (rlen <= iclog->ic_size - *log_offset) + ophdr->oh_flags |= XLOG_END_TRANS; + else + ophdr->oh_flags |= XLOG_CONTINUE_TRANS; - /* no more space in this iclog - push it. */ - spin_lock(&log->l_icloglock); - xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); - *record_cnt = 0; - *data_cnt = 0; + rlen = min_t(uint32_t, rlen, iclog->ic_size - *log_offset); + ophdr->oh_len = cpu_to_be32(rlen); - if (iclog->ic_state == XLOG_STATE_ACTIVE) - xlog_state_switch_iclogs(log, iclog, 0); - else - ASSERT(iclog->ic_state == XLOG_STATE_WANT_SYNC || - xlog_is_shutdown(log)); -release_iclog: - error = xlog_state_release_iclog(log, iclog); - spin_unlock(&log->l_icloglock); - return error; + xlog_verify_dest_ptr(log, iclog->ic_datap + *log_offset); + xlog_write_iovec(iclog, log_offset, + reg->i_addr + reg_offset, + rlen, len, record_cnt, data_cnt); + + } while (ophdr->oh_flags & XLOG_CONTINUE_TRANS); + } + + /* + * No more iovecs remain in this logvec so return the next log vec to + * the caller so it can go back to fast path copying. + */ + *iclogp = iclog; + return 0; } /* @@ -2421,14 +2488,11 @@ xlog_write( { struct xlog_in_core *iclog = NULL; struct xfs_log_vec *lv = log_vector; - struct xfs_log_iovec *vecp = lv->lv_iovecp; - int index = 0; - int partial_copy = 0; - int partial_copy_len = 0; int contwr = 0; uint32_t record_cnt = 0; uint32_t data_cnt = 0; int error = 0; + int log_offset; if (ticket->t_curr_res < 0) { xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, @@ -2437,151 +2501,54 @@ xlog_write( xlog_force_shutdown(log, SHUTDOWN_LOG_IO_ERROR); } - while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { - void *ptr; - int log_offset; - - error = xlog_state_get_iclog_space(log, len, &iclog, ticket, - &contwr, &log_offset); - if (error) - return error; + error = xlog_state_get_iclog_space(log, len, &iclog, ticket, + &contwr, &log_offset); + if (error) + return error; - ASSERT(log_offset <= iclog->ic_size - 1); + ASSERT(log_offset <= iclog->ic_size - 1); - /* - * If we have a context pointer, pass it the first iclog we are - * writing to so it can record state needed for iclog write - * ordering. - */ - if (ctx) { - xlog_cil_set_ctx_write_state(ctx, iclog); - ctx = NULL; - } - - /* If this is a single iclog write, go fast... */ - if (!contwr && lv == log_vector) { - while (lv) { - xlog_write_full(lv, ticket, iclog, &log_offset, - &len, &record_cnt, &data_cnt); - lv = lv->lv_next; - } - data_cnt = 0; - break; - } + /* + * If we have a context pointer, pass it the first iclog we are + * writing to so it can record state needed for iclog write + * ordering. + */ + if (ctx) + xlog_cil_set_ctx_write_state(ctx, iclog); + while (lv) { /* - * This loop writes out as many regions as can fit in the amount - * of space which was allocated by xlog_state_get_iclog_space(). + * If the entire log vec does not fit in the iclog, punt it to + * the partial copy loop which can handle this case. */ - ptr = iclog->ic_datap + log_offset; - while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { - struct xfs_log_iovec *reg; - struct xlog_op_header *ophdr; - int copy_len; - int copy_off; - bool ordered = false; - bool added_ophdr = false; - - /* ordered log vectors have no regions to write */ - if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) { - ASSERT(lv->lv_niovecs == 0); - ordered = true; - goto next_lv; - } - - reg = &vecp[index]; - ASSERT(reg->i_len % sizeof(int32_t) == 0); - ASSERT((unsigned long)ptr % sizeof(int32_t) == 0); - - /* - * Regions always have their ophdr at the start of the - * region, except for: - * - a transaction start which has a start record ophdr - * before the first region ophdr; and - * - the previous region didn't fully fit into an iclog - * so needs a continuation ophdr to prepend the region - * in this new iclog. - */ - ophdr = reg->i_addr; - if (optype && index) { - optype &= ~XLOG_START_TRANS; - } else if (partial_copy) { - ophdr = xlog_write_setup_ophdr(ptr, ticket); - xlog_write_adv_cnt(&ptr, &len, &log_offset, - sizeof(struct xlog_op_header)); - added_ophdr = true; - } - ophdr->oh_tid = cpu_to_be32(ticket->t_tid); - - len += xlog_write_setup_copy(ticket, ophdr, - iclog->ic_size-log_offset, - reg->i_len, - ©_off, ©_len, - &partial_copy, - &partial_copy_len); - xlog_verify_dest_ptr(log, ptr); - - - /* - * Wart: need to update length in embedded ophdr not - * to include it's own length. - */ - if (!added_ophdr) { - ophdr->oh_len = cpu_to_be32(copy_len - - sizeof(struct xlog_op_header)); - } - - ASSERT(copy_len > 0); - memcpy(ptr, reg->i_addr + copy_off, copy_len); - xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); - - if (added_ophdr) - copy_len += sizeof(struct xlog_op_header); - record_cnt++; - data_cnt += contwr ? copy_len : 0; - - error = xlog_write_copy_finish(log, iclog, optype, - &record_cnt, &data_cnt, - &partial_copy, - &partial_copy_len, - log_offset); - if (error) + if (lv->lv_niovecs && + lv->lv_bytes > iclog->ic_size - log_offset) { + error = xlog_write_partial(lv, ticket, &iclog, + &log_offset, &len, &record_cnt, + &data_cnt, &contwr); + if (error) { + /* + * We have no iclog to release, so just return + * the error immediately. + */ return error; - - /* - * if we had a partial copy, we need to get more iclog - * space but we don't want to increment the region - * index because there is still more is this region to - * write. - * - * If we completed writing this region, and we flushed - * the iclog (indicated by resetting of the record - * count), then we also need to get more log space. If - * this was the last record, though, we are done and - * can just return. - */ - if (partial_copy) - break; - - if (++index == lv->lv_niovecs) { -next_lv: - lv = lv->lv_next; - index = 0; - if (lv) - vecp = lv->lv_iovecp; - } - if (record_cnt == 0 && !ordered) { - if (!lv) - return 0; - break; } + } else { + xlog_write_full(lv, ticket, iclog, &log_offset, + &len, &record_cnt, &data_cnt); } + lv = lv->lv_next; } - ASSERT(len == 0); + /* + * We've already been guaranteed that the last writes will fit inside + * the current iclog, and hence it will already have the space used by + * those writes accounted to it. Hence we do not need to update the + * iclog with the number of bytes written here. + */ spin_lock(&log->l_icloglock); - xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); + xlog_state_finish_copy(log, iclog, record_cnt, 0); error = xlog_state_release_iclog(log, iclog); spin_unlock(&log->l_icloglock); @@ -3738,11 +3705,12 @@ xlog_verify_iclog( iclog->ic_header.h_cycle_data[idx]); } } - if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) + if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) { xfs_warn(log->l_mp, - "%s: invalid clientid %d op "PTR_FMT" offset 0x%lx", - __func__, clientid, ophead, + "%s: op %d invalid clientid %d op "PTR_FMT" offset 0x%lx", + __func__, i, clientid, ophead, (unsigned long)field_offset); + } /* check length */ p = &ophead->oh_len; diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h index 20d818c14003..626e293ab2a4 100644 --- a/fs/xfs/xfs_log_priv.h +++ b/fs/xfs/xfs_log_priv.h @@ -491,14 +491,6 @@ extern struct kmem_cache *xfs_log_ticket_cache; struct xlog_ticket *xlog_ticket_alloc(struct xlog *log, int unit_bytes, int count, bool permanent); -static inline void -xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes) -{ - *ptr += bytes; - *len -= bytes; - *off += bytes; -} - void xlog_print_tic_res(struct xfs_mount *mp, struct xlog_ticket *ticket); void xlog_print_trans(struct xfs_trans *); int xlog_write(struct xlog *log, struct xfs_cil_ctx *ctx, |