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xfs: cleanup the transaction commit path a bit

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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>
This commit is contained in:
Christoph Hellwig 2011-12-06 21:58:08 +00:00 committed by Ben Myers
parent 93b8a5854f
commit 0244b9603d
3 changed files with 63 additions and 99 deletions
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3
fs/xfs/xfs_log.h
View file

@ -184,8 +184,7 @@ void xlog_iodone(struct xfs_buf *);
struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
void xfs_log_ticket_put(struct xlog_ticket *ticket);
void xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
struct xfs_log_vec *log_vector,
int xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
xfs_lsn_t *commit_lsn, int flags);
bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);

78
fs/xfs/xfs_log_cil.c
View file

@ -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 @@ xlog_cil_push(
* 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;
}
/*

81
fs/xfs/xfs_trans.c
View file

@ -1324,82 +1324,6 @@ xfs_trans_committed_bulk(
spin_unlock(&ailp->xa_lock);
}
/*
* Walk the log items and allocate log vector structures for
* each item large enough to fit all the vectors they require.
* Note that this format differs from the old log vector format in
* that there is no transaction header in these log vectors.
*/
STATIC struct xfs_log_vec *
xfs_trans_alloc_log_vecs(
xfs_trans_t *tp)
{
struct xfs_log_item_desc *lidp;
struct xfs_log_vec *lv = NULL;
struct xfs_log_vec *ret_lv = NULL;
/* 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;
/* 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;
if (!ret_lv)
ret_lv = new_lv;
else
lv->lv_next = new_lv;
lv = new_lv;
}
return ret_lv;
}
static int
xfs_trans_commit_cil(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_lsn_t *commit_lsn,
int flags)
{
struct xfs_log_vec *log_vector;
/*
* Get each log item to allocate a vector structure for
* the log item to to pass to the log write code. The
* CIL commit code will format the vector and save it away.
*/
log_vector = xfs_trans_alloc_log_vecs(tp);
if (!log_vector)
return ENOMEM;
xfs_log_commit_cil(mp, tp, log_vector, commit_lsn, flags);
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free(tp);
return 0;
}
/*
* Commit the given transaction to the log.
*
@ -1456,13 +1380,16 @@ xfs_trans_commit(
xfs_trans_apply_sb_deltas(tp);
xfs_trans_apply_dquot_deltas(tp);
error = xfs_trans_commit_cil(mp, tp, &commit_lsn, flags);
error = xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
if (error == ENOMEM) {
xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
error = XFS_ERROR(EIO);
goto out_unreserve;
}
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free(tp);
/*
* If the transaction needs to be synchronous, then force the
* log out now and wait for it.