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path: root/fs/xfs/xfs_log_cil.c
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Diffstat (limited to 'fs/xfs/xfs_log_cil.c')
-rw-r--r--fs/xfs/xfs_log_cil.c75
1 files changed, 51 insertions, 24 deletions
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index d0833b54e55d..02b9cf3f8252 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -127,6 +127,7 @@ xlog_cil_prepare_log_vecs(
int index;
int len = 0;
uint niovecs;
+ bool ordered = false;
/* Skip items which aren't dirty in this transaction. */
if (!(lidp->lid_flags & XFS_LID_DIRTY))
@@ -137,14 +138,30 @@ xlog_cil_prepare_log_vecs(
if (!niovecs)
continue;
+ /*
+ * Ordered items need to be tracked but we do not wish to write
+ * them. We need a logvec to track the object, but we do not
+ * need an iovec or buffer to be allocated for copying data.
+ */
+ if (niovecs == XFS_LOG_VEC_ORDERED) {
+ ordered = true;
+ niovecs = 0;
+ }
+
new_lv = kmem_zalloc(sizeof(*new_lv) +
niovecs * sizeof(struct xfs_log_iovec),
KM_SLEEP|KM_NOFS);
+ new_lv->lv_item = lidp->lid_item;
+ new_lv->lv_niovecs = niovecs;
+ if (ordered) {
+ /* track as an ordered logvec */
+ new_lv->lv_buf_len = XFS_LOG_VEC_ORDERED;
+ goto next;
+ }
+
/* The allocated iovec region lies beyond the log vector. */
new_lv->lv_iovecp = (struct xfs_log_iovec *)&new_lv[1];
- new_lv->lv_niovecs = niovecs;
- new_lv->lv_item = lidp->lid_item;
/* build the vector array and calculate it's length */
IOP_FORMAT(new_lv->lv_item, new_lv->lv_iovecp);
@@ -165,6 +182,7 @@ xlog_cil_prepare_log_vecs(
}
ASSERT(ptr == new_lv->lv_buf + new_lv->lv_buf_len);
+next:
if (!ret_lv)
ret_lv = new_lv;
else
@@ -191,8 +209,18 @@ xfs_cil_prepare_item(
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);
+ ASSERT((old->lv_buf && old->lv_buf_len && old->lv_niovecs) ||
+ old->lv_buf_len == XFS_LOG_VEC_ORDERED);
+
+ /*
+ * If the new item is ordered, keep the old one that is already
+ * tracking dirty or ordered regions
+ */
+ if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) {
+ ASSERT(!lv->lv_buf);
+ kmem_free(lv);
+ return;
+ }
*len += lv->lv_buf_len - old->lv_buf_len;
*diff_iovecs += lv->lv_niovecs - old->lv_niovecs;
@@ -201,10 +229,11 @@ xfs_cil_prepare_item(
} 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;
+ if (lv->lv_buf_len != XFS_LOG_VEC_ORDERED) {
+ *len += lv->lv_buf_len;
+ *diff_iovecs += lv->lv_niovecs;
+ }
IOP_PIN(lv->lv_item);
}
@@ -259,18 +288,24 @@ xlog_cil_insert_items(
* 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)
- 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);
+ for (lv = log_vector; lv; ) {
+ struct xfs_log_vec *next = lv->lv_next;
- /* move the items to the tail of the CIL */
- for (lv = log_vector; lv; lv = lv->lv_next)
+ ASSERT(lv->lv_item->li_lv || list_empty(&lv->lv_item->li_cil));
+ lv->lv_next = NULL;
+
+ /*
+ * xfs_cil_prepare_item() may free the lv, so move the item on
+ * the CIL first.
+ */
list_move_tail(&lv->lv_item->li_cil, &cil->xc_cil);
+ xfs_cil_prepare_item(log, lv, &len, &diff_iovecs);
+ lv = next;
+ }
+ /* account for space used by new iovec headers */
+ len += diff_iovecs * sizeof(xlog_op_header_t);
ctx->nvecs += diff_iovecs;
/*
@@ -381,9 +416,7 @@ xlog_cil_push(
struct xfs_cil_ctx *new_ctx;
struct xlog_in_core *commit_iclog;
struct xlog_ticket *tic;
- int num_lv;
int num_iovecs;
- int len;
int error = 0;
struct xfs_trans_header thdr;
struct xfs_log_iovec lhdr;
@@ -428,12 +461,9 @@ xlog_cil_push(
* side which is currently locked out by the flush lock.
*/
lv = NULL;
- num_lv = 0;
num_iovecs = 0;
- len = 0;
while (!list_empty(&cil->xc_cil)) {
struct xfs_log_item *item;
- int i;
item = list_first_entry(&cil->xc_cil,
struct xfs_log_item, li_cil);
@@ -444,11 +474,7 @@ xlog_cil_push(
lv->lv_next = item->li_lv;
lv = item->li_lv;
item->li_lv = NULL;
-
- num_lv++;
num_iovecs += lv->lv_niovecs;
- for (i = 0; i < lv->lv_niovecs; i++)
- len += lv->lv_iovecp[i].i_len;
}
/*
@@ -701,6 +727,7 @@ xfs_log_commit_cil(
if (commit_lsn)
*commit_lsn = log->l_cilp->xc_ctx->sequence;
+ /* xlog_cil_insert_items() destroys log_vector list */
xlog_cil_insert_items(log, log_vector, tp->t_ticket);
/* check we didn't blow the reservation */