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authorChristoph Hellwig <hch@infradead.org>2011-12-07 01:58:08 +0400
committerBen Myers <bpm@sgi.com>2011-12-08 23:53:30 +0400
commit0244b9603df38bf19155b761689e1a816fc50b0a (patch)
tree256b91c77c63d2ec58af5844f1e3eb1f587ceaf1 /fs/xfs/xfs_log_cil.c
parent93b8a5854f247138e401471a9c3b82ccb62ff608 (diff)
downloadlinux-0244b9603df38bf19155b761689e1a816fc50b0a.tar.xz
xfs: cleanup the transaction commit path a bit
Now that the nodelaylog mode is gone we can simplify the transaction commit path a bit by removing the xfs_trans_commit_cil routine. Restoring the process flags is merged into xfs_trans_commit which already does it for the error path, and allocating the log vectors is merged into xlog_cil_format_items, which already fills them with data, thus avoiding one loop over all log items. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log_cil.c')
-rw-r--r--fs/xfs/xfs_log_cil.c78
1 files changed, 58 insertions, 20 deletions
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index eb207a92e1b1..68812d3ab14d 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -159,37 +159,72 @@ xlog_cil_init_post_recovery(
* format the regions into the iclog as though they are being formatted
* directly out of the objects themselves.
*/
-static void
-xlog_cil_format_items(
- struct log *log,
- struct xfs_log_vec *log_vector)
+static struct xfs_log_vec *
+xlog_cil_prepare_log_vecs(
+ struct xfs_trans *tp)
{
- struct xfs_log_vec *lv;
+ struct xfs_log_item_desc *lidp;
+ struct xfs_log_vec *lv = NULL;
+ struct xfs_log_vec *ret_lv = NULL;
- ASSERT(log_vector);
- for (lv = log_vector; lv; lv = lv->lv_next) {
+
+ /* Bail out if we didn't find a log item. */
+ if (list_empty(&tp->t_items)) {
+ ASSERT(0);
+ return NULL;
+ }
+
+ list_for_each_entry(lidp, &tp->t_items, lid_trans) {
+ struct xfs_log_vec *new_lv;
void *ptr;
int index;
int len = 0;
+ /* Skip items which aren't dirty in this transaction. */
+ if (!(lidp->lid_flags & XFS_LID_DIRTY))
+ continue;
+
+ /* Skip items that do not have any vectors for writing */
+ lidp->lid_size = IOP_SIZE(lidp->lid_item);
+ if (!lidp->lid_size)
+ continue;
+
+ new_lv = kmem_zalloc(sizeof(*new_lv) +
+ lidp->lid_size * sizeof(struct xfs_log_iovec),
+ KM_SLEEP);
+
+ /* The allocated iovec region lies beyond the log vector. */
+ new_lv->lv_iovecp = (struct xfs_log_iovec *)&new_lv[1];
+ new_lv->lv_niovecs = lidp->lid_size;
+ new_lv->lv_item = lidp->lid_item;
+
/* build the vector array and calculate it's length */
- IOP_FORMAT(lv->lv_item, lv->lv_iovecp);
- for (index = 0; index < lv->lv_niovecs; index++)
- len += lv->lv_iovecp[index].i_len;
+ IOP_FORMAT(new_lv->lv_item, new_lv->lv_iovecp);
+ for (index = 0; index < new_lv->lv_niovecs; index++)
+ len += new_lv->lv_iovecp[index].i_len;
- lv->lv_buf_len = len;
- lv->lv_buf = kmem_alloc(lv->lv_buf_len, KM_SLEEP|KM_NOFS);
- ptr = lv->lv_buf;
+ new_lv->lv_buf_len = len;
+ new_lv->lv_buf = kmem_alloc(new_lv->lv_buf_len,
+ KM_SLEEP|KM_NOFS);
+ ptr = new_lv->lv_buf;
- for (index = 0; index < lv->lv_niovecs; index++) {
- struct xfs_log_iovec *vec = &lv->lv_iovecp[index];
+ for (index = 0; index < new_lv->lv_niovecs; index++) {
+ struct xfs_log_iovec *vec = &new_lv->lv_iovecp[index];
memcpy(ptr, vec->i_addr, vec->i_len);
vec->i_addr = ptr;
ptr += vec->i_len;
}
- ASSERT(ptr == lv->lv_buf + lv->lv_buf_len);
+ ASSERT(ptr == new_lv->lv_buf + new_lv->lv_buf_len);
+
+ if (!ret_lv)
+ ret_lv = new_lv;
+ else
+ lv->lv_next = new_lv;
+ lv = new_lv;
}
+
+ return ret_lv;
}
/*
@@ -622,28 +657,30 @@ out_abort:
* background commit, returns without it held once background commits are
* allowed again.
*/
-void
+int
xfs_log_commit_cil(
struct xfs_mount *mp,
struct xfs_trans *tp,
- struct xfs_log_vec *log_vector,
xfs_lsn_t *commit_lsn,
int flags)
{
struct log *log = mp->m_log;
int log_flags = 0;
int push = 0;
+ struct xfs_log_vec *log_vector;
if (flags & XFS_TRANS_RELEASE_LOG_RES)
log_flags = XFS_LOG_REL_PERM_RESERV;
/*
- * do all the hard work of formatting items (including memory
+ * Do all the hard work of formatting items (including memory
* allocation) outside the CIL context lock. This prevents stalling CIL
* pushes when we are low on memory and a transaction commit spends a
* lot of time in memory reclaim.
*/
- xlog_cil_format_items(log, log_vector);
+ log_vector = xlog_cil_prepare_log_vecs(tp);
+ if (!log_vector)
+ return ENOMEM;
/* lock out background commit */
down_read(&log->l_cilp->xc_ctx_lock);
@@ -696,6 +733,7 @@ xfs_log_commit_cil(
*/
if (push)
xlog_cil_push(log, 0);
+ return 0;
}
/*