INIT_LIST_HEAD(&cil->xc_committing);
spin_lock_init(&cil->xc_cil_lock);
init_rwsem(&cil->xc_ctx_lock);
- sv_init(&cil->xc_commit_wait, SV_DEFAULT, "cilwait");
+ init_waitqueue_head(&cil->xc_commit_wait);
INIT_LIST_HEAD(&ctx->committing);
INIT_LIST_HEAD(&ctx->busy_extents);
log->l_curr_block);
}
-/*
- * Insert the log item into the CIL and calculate the difference in space
- * consumed by the item. Add the space to the checkpoint ticket and calculate
- * if the change requires additional log metadata. If it does, take that space
- * as well. Remove the amount of space we addded to the checkpoint ticket from
- * the current transaction ticket so that the accounting works out correctly.
- *
- * If this is the first time the item is being placed into the CIL in this
- * context, pin it so it can't be written to disk until the CIL is flushed to
- * the iclog and the iclog written to disk.
- */
-static void
-xlog_cil_insert(
- struct log *log,
- struct xlog_ticket *ticket,
- struct xfs_log_item *item,
- struct xfs_log_vec *lv)
-{
- struct xfs_cil *cil = log->l_cilp;
- struct xfs_log_vec *old = lv->lv_item->li_lv;
- struct xfs_cil_ctx *ctx = cil->xc_ctx;
- int len;
- int diff_iovecs;
- int iclog_space;
-
- if (old) {
- /* existing lv on log item, space used is a delta */
- ASSERT(!list_empty(&item->li_cil));
- ASSERT(old->lv_buf && old->lv_buf_len && old->lv_niovecs);
-
- len = lv->lv_buf_len - old->lv_buf_len;
- diff_iovecs = lv->lv_niovecs - old->lv_niovecs;
- kmem_free(old->lv_buf);
- kmem_free(old);
- } else {
- /* new lv, must pin the log item */
- ASSERT(!lv->lv_item->li_lv);
- ASSERT(list_empty(&item->li_cil));
-
- len = lv->lv_buf_len;
- diff_iovecs = lv->lv_niovecs;
- IOP_PIN(lv->lv_item);
-
- }
- len += diff_iovecs * sizeof(xlog_op_header_t);
-
- /* attach new log vector to log item */
- lv->lv_item->li_lv = lv;
-
- spin_lock(&cil->xc_cil_lock);
- list_move_tail(&item->li_cil, &cil->xc_cil);
- ctx->nvecs += diff_iovecs;
-
- /*
- * If this is the first time the item is being committed to the CIL,
- * store the sequence number on the log item so we can tell
- * in future commits whether this is the first checkpoint the item is
- * being committed into.
- */
- if (!item->li_seq)
- item->li_seq = ctx->sequence;
-
- /*
- * Now transfer enough transaction reservation to the context ticket
- * for the checkpoint. The context ticket is special - the unit
- * reservation has to grow as well as the current reservation as we
- * steal from tickets so we can correctly determine the space used
- * during the transaction commit.
- */
- if (ctx->ticket->t_curr_res == 0) {
- /* first commit in checkpoint, steal the header reservation */
- ASSERT(ticket->t_curr_res >= ctx->ticket->t_unit_res + len);
- ctx->ticket->t_curr_res = ctx->ticket->t_unit_res;
- ticket->t_curr_res -= ctx->ticket->t_unit_res;
- }
-
- /* do we need space for more log record headers? */
- iclog_space = log->l_iclog_size - log->l_iclog_hsize;
- if (len > 0 && (ctx->space_used / iclog_space !=
- (ctx->space_used + len) / iclog_space)) {
- int hdrs;
-
- hdrs = (len + iclog_space - 1) / iclog_space;
- /* need to take into account split region headers, too */
- hdrs *= log->l_iclog_hsize + sizeof(struct xlog_op_header);
- ctx->ticket->t_unit_res += hdrs;
- ctx->ticket->t_curr_res += hdrs;
- ticket->t_curr_res -= hdrs;
- ASSERT(ticket->t_curr_res >= len);
- }
- ticket->t_curr_res -= len;
- ctx->space_used += len;
-
- spin_unlock(&cil->xc_cil_lock);
-}
-
/*
* Format log item into a flat buffers
*
len += lv->lv_iovecp[index].i_len;
lv->lv_buf_len = len;
- lv->lv_buf = kmem_zalloc(lv->lv_buf_len, KM_SLEEP|KM_NOFS);
+ lv->lv_buf = kmem_alloc(lv->lv_buf_len, KM_SLEEP|KM_NOFS);
ptr = lv->lv_buf;
for (index = 0; index < lv->lv_niovecs; index++) {
}
}
+/*
+ * Prepare the log item for insertion into the CIL. Calculate the difference in
+ * log space and vectors it will consume, and if it is a new item pin it as
+ * well.
+ */
+STATIC void
+xfs_cil_prepare_item(
+ struct log *log,
+ struct xfs_log_vec *lv,
+ int *len,
+ int *diff_iovecs)
+{
+ struct xfs_log_vec *old = lv->lv_item->li_lv;
+
+ if (old) {
+ /* existing lv on log item, space used is a delta */
+ ASSERT(!list_empty(&lv->lv_item->li_cil));
+ ASSERT(old->lv_buf && old->lv_buf_len && old->lv_niovecs);
+
+ *len += lv->lv_buf_len - old->lv_buf_len;
+ *diff_iovecs += lv->lv_niovecs - old->lv_niovecs;
+ kmem_free(old->lv_buf);
+ kmem_free(old);
+ } else {
+ /* new lv, must pin the log item */
+ ASSERT(!lv->lv_item->li_lv);
+ ASSERT(list_empty(&lv->lv_item->li_cil));
+
+ *len += lv->lv_buf_len;
+ *diff_iovecs += lv->lv_niovecs;
+ IOP_PIN(lv->lv_item);
+
+ }
+
+ /* attach new log vector to log item */
+ lv->lv_item->li_lv = lv;
+
+ /*
+ * If this is the first time the item is being committed to the
+ * CIL, store the sequence number on the log item so we can
+ * tell in future commits whether this is the first checkpoint
+ * the item is being committed into.
+ */
+ if (!lv->lv_item->li_seq)
+ lv->lv_item->li_seq = log->l_cilp->xc_ctx->sequence;
+}
+
+/*
+ * Insert the log items into the CIL and calculate the difference in space
+ * consumed by the item. Add the space to the checkpoint ticket and calculate
+ * if the change requires additional log metadata. If it does, take that space
+ * as well. Remove the amount of space we addded to the checkpoint ticket from
+ * the current transaction ticket so that the accounting works out correctly.
+ */
static void
xlog_cil_insert_items(
struct log *log,
struct xfs_log_vec *log_vector,
- struct xlog_ticket *ticket,
- xfs_lsn_t *start_lsn)
+ struct xlog_ticket *ticket)
{
- struct xfs_log_vec *lv;
-
- if (start_lsn)
- *start_lsn = log->l_cilp->xc_ctx->sequence;
+ struct xfs_cil *cil = log->l_cilp;
+ struct xfs_cil_ctx *ctx = cil->xc_ctx;
+ struct xfs_log_vec *lv;
+ int len = 0;
+ int diff_iovecs = 0;
+ int iclog_space;
ASSERT(log_vector);
+
+ /*
+ * Do all the accounting aggregation and switching of log vectors
+ * around in a separate loop to the insertion of items into the CIL.
+ * Then we can do a separate loop to update the CIL within a single
+ * lock/unlock pair. This reduces the number of round trips on the CIL
+ * lock from O(nr_logvectors) to O(1) and greatly reduces the overall
+ * hold time for the transaction commit.
+ *
+ * If this is the first time the item is being placed into the CIL in
+ * this context, pin it so it can't be written to disk until the CIL is
+ * flushed to the iclog and the iclog written to disk.
+ *
+ * We can do this safely because the context can't checkpoint until we
+ * are done so it doesn't matter exactly how we update the CIL.
+ */
for (lv = log_vector; lv; lv = lv->lv_next)
- xlog_cil_insert(log, ticket, lv->lv_item, lv);
+ xfs_cil_prepare_item(log, lv, &len, &diff_iovecs);
+
+ /* account for space used by new iovec headers */
+ len += diff_iovecs * sizeof(xlog_op_header_t);
+
+ spin_lock(&cil->xc_cil_lock);
+
+ /* move the items to the tail of the CIL */
+ for (lv = log_vector; lv; lv = lv->lv_next)
+ list_move_tail(&lv->lv_item->li_cil, &cil->xc_cil);
+
+ ctx->nvecs += diff_iovecs;
+
+ /*
+ * Now transfer enough transaction reservation to the context ticket
+ * for the checkpoint. The context ticket is special - the unit
+ * reservation has to grow as well as the current reservation as we
+ * steal from tickets so we can correctly determine the space used
+ * during the transaction commit.
+ */
+ if (ctx->ticket->t_curr_res == 0) {
+ /* first commit in checkpoint, steal the header reservation */
+ ASSERT(ticket->t_curr_res >= ctx->ticket->t_unit_res + len);
+ ctx->ticket->t_curr_res = ctx->ticket->t_unit_res;
+ ticket->t_curr_res -= ctx->ticket->t_unit_res;
+ }
+
+ /* do we need space for more log record headers? */
+ iclog_space = log->l_iclog_size - log->l_iclog_hsize;
+ if (len > 0 && (ctx->space_used / iclog_space !=
+ (ctx->space_used + len) / iclog_space)) {
+ int hdrs;
+
+ hdrs = (len + iclog_space - 1) / iclog_space;
+ /* need to take into account split region headers, too */
+ hdrs *= log->l_iclog_hsize + sizeof(struct xlog_op_header);
+ ctx->ticket->t_unit_res += hdrs;
+ ctx->ticket->t_curr_res += hdrs;
+ ticket->t_curr_res -= hdrs;
+ ASSERT(ticket->t_curr_res >= len);
+ }
+ ticket->t_curr_res -= len;
+ ctx->space_used += len;
+
+ spin_unlock(&cil->xc_cil_lock);
}
static void
int abort)
{
struct xfs_cil_ctx *ctx = args;
- struct xfs_log_vec *lv;
- int abortflag = abort ? XFS_LI_ABORTED : 0;
struct xfs_busy_extent *busyp, *n;
- /* unpin all the log items */
- for (lv = ctx->lv_chain; lv; lv = lv->lv_next ) {
- xfs_trans_item_committed(lv->lv_item, ctx->start_lsn,
- abortflag);
- }
+ xfs_trans_committed_bulk(ctx->cil->xc_log->l_ailp, ctx->lv_chain,
+ ctx->start_lsn, abort);
list_for_each_entry_safe(busyp, n, &ctx->busy_extents, list)
xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, busyp);
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
- sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
+ xlog_wait(&cil->xc_commit_wait, &cil->xc_cil_lock);
goto restart;
}
}
*/
spin_lock(&cil->xc_cil_lock);
ctx->commit_lsn = commit_lsn;
- sv_broadcast(&cil->xc_commit_wait);
+ wake_up_all(&cil->xc_commit_wait);
spin_unlock(&cil->xc_cil_lock);
/* release the hounds! */
/* lock out background commit */
down_read(&log->l_cilp->xc_ctx_lock);
- xlog_cil_insert_items(log, log_vector, tp->t_ticket, commit_lsn);
+ if (commit_lsn)
+ *commit_lsn = log->l_cilp->xc_ctx->sequence;
+
+ xlog_cil_insert_items(log, log_vector, tp->t_ticket);
/* check we didn't blow the reservation */
if (tp->t_ticket->t_curr_res < 0)
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
- sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
+ xlog_wait(&cil->xc_commit_wait, &cil->xc_cil_lock);
goto restart;
}
if (ctx->sequence != sequence)
git.openpandora.org / pandora-kernel.git / blobdiff