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xfs: factor and move some code in xfs_log_cil.c

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In preparation for adding support for intent item whiteouts.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2022-05-04 11:46:30 +10:00 committed by Dave Chinner
parent bb7b1c9c5d
commit 22b1afc57e
1 changed files with 67 additions and 52 deletions
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119
fs/xfs/xfs_log_cil.c
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@ -47,6 +47,38 @@ xlog_cil_ticket_alloc(
return tic;
}
/*
* Check if the current log item was first committed in this sequence.
* We can't rely on just the log item being in the CIL, we have to check
* the recorded commit sequence number.
*
* Note: for this to be used in a non-racy manner, it has to be called with
* CIL flushing locked out. As a result, it should only be used during the
* transaction commit process when deciding what to format into the item.
*/
static bool
xlog_item_in_current_chkpt(
struct xfs_cil *cil,
struct xfs_log_item *lip)
{
if (list_empty(&lip->li_cil))
return false;
/*
* li_seq is written on the first commit of a log item to record the
* first checkpoint it is written to. Hence if it is different to the
* current sequence, we're in a new checkpoint.
*/
return lip->li_seq == READ_ONCE(cil->xc_current_sequence);
}
bool
xfs_log_item_in_current_chkpt(
struct xfs_log_item *lip)
{
return xlog_item_in_current_chkpt(lip->li_log->l_cilp, lip);
}
/*
* Unavoidable forward declaration - xlog_cil_push_work() calls
* xlog_cil_ctx_alloc() itself.
@ -934,6 +966,40 @@ xlog_cil_build_trans_hdr(
tic->t_curr_res -= lvhdr->lv_bytes;
}
/*
* Pull all the log vectors off the items in the CIL, and remove the items from
* the CIL. We don't need the CIL lock here because it's only needed on the
* transaction commit side which is currently locked out by the flush lock.
*/
static void
xlog_cil_build_lv_chain(
struct xfs_cil *cil,
struct xfs_cil_ctx *ctx,
uint32_t *num_iovecs,
uint32_t *num_bytes)
{
struct xfs_log_vec *lv = NULL;
while (!list_empty(&cil->xc_cil)) {
struct xfs_log_item *item;
item = list_first_entry(&cil->xc_cil,
struct xfs_log_item, li_cil);
list_del_init(&item->li_cil);
if (!ctx->lv_chain)
ctx->lv_chain = item->li_lv;
else
lv->lv_next = item->li_lv;
lv = item->li_lv;
item->li_lv = NULL;
*num_iovecs += lv->lv_niovecs;
/* we don't write ordered log vectors */
if (lv->lv_buf_len != XFS_LOG_VEC_ORDERED)
*num_bytes += lv->lv_bytes;
}
}
/*
* Push the Committed Item List to the log.
*
@ -956,7 +1022,6 @@ xlog_cil_push_work(
container_of(work, struct xfs_cil_ctx, push_work);
struct xfs_cil *cil = ctx->cil;
struct xlog *log = cil->xc_log;
struct xfs_log_vec *lv;
struct xfs_cil_ctx *new_ctx;
int num_iovecs = 0;
int num_bytes = 0;
@ -1033,31 +1098,7 @@ xlog_cil_push_work(
list_add(&ctx->committing, &cil->xc_committing);
spin_unlock(&cil->xc_push_lock);
/*
* Pull all the log vectors off the items in the CIL, and remove the
* items from the CIL. We don't need the CIL lock here because it's only
* needed on the transaction commit side which is currently locked out
* by the flush lock.
*/
lv = NULL;
while (!list_empty(&cil->xc_cil)) {
struct xfs_log_item *item;
item = list_first_entry(&cil->xc_cil,
struct xfs_log_item, li_cil);
list_del_init(&item->li_cil);
if (!ctx->lv_chain)
ctx->lv_chain = item->li_lv;
else
lv->lv_next = item->li_lv;
lv = item->li_lv;
item->li_lv = NULL;
num_iovecs += lv->lv_niovecs;
/* we don't write ordered log vectors */
if (lv->lv_buf_len != XFS_LOG_VEC_ORDERED)
num_bytes += lv->lv_bytes;
}
xlog_cil_build_lv_chain(cil, ctx, &num_iovecs, &num_bytes);
/*
* Switch the contexts so we can drop the context lock and move out
@ -1508,32 +1549,6 @@ xlog_cil_force_seq(
return 0;
}
/*
* Check if the current log item was first committed in this sequence.
* We can't rely on just the log item being in the CIL, we have to check
* the recorded commit sequence number.
*
* Note: for this to be used in a non-racy manner, it has to be called with
* CIL flushing locked out. As a result, it should only be used during the
* transaction commit process when deciding what to format into the item.
*/
bool
xfs_log_item_in_current_chkpt(
struct xfs_log_item *lip)
{
struct xfs_cil *cil = lip->li_log->l_cilp;
if (list_empty(&lip->li_cil))
return false;
/*
* li_seq is written on the first commit of a log item to record the
* first checkpoint it is written to. Hence if it is different to the
* current sequence, we're in a new checkpoint.
*/
return lip->li_seq == READ_ONCE(cil->xc_current_sequence);
}
/*
* Perform initial CIL structure initialisation.
*/