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Use list_head infra-structure for buffer's log items list

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Now that buffer's b_fspriv has been split, just replace the current
singly linked list of xfs_log_items, by the list_head infrastructure.

Also, remove the xfs_log_item argument from xfs_buf_resubmit_failed_buffers(),
there is no need for this argument, once the log items can be walked
through the list_head in the buffer.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[darrick: minor style cleanups]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Carlos Maiolino
2018-01-24 13:38:49 -08:00
committed by Darrick J. Wong
parent fb1755a645
commit 643c8c05e7
9 changed files with 45 additions and 72 deletions
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57
fs/xfs/xfs_buf_item.c
View File

@@ -457,7 +457,7 @@ xfs_buf_item_unpin(
if (bip->bli_flags & XFS_BLI_STALE_INODE) {
xfs_buf_do_callbacks(bp);
bp->b_log_item = NULL;
bp->b_li_list = NULL;
list_del_init(&bp->b_li_list);
bp->b_iodone = NULL;
} else {
spin_lock(&ailp->xa_lock);
@@ -955,13 +955,12 @@ xfs_buf_item_relse(
xfs_buf_t *bp)
{
struct xfs_buf_log_item *bip = bp->b_log_item;
struct xfs_log_item *lip = bp->b_li_list;
trace_xfs_buf_item_relse(bp, _RET_IP_);
ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
bp->b_log_item = NULL;
if (lip == NULL)
if (list_empty(&bp->b_li_list))
bp->b_iodone = NULL;
xfs_buf_rele(bp);
@@ -982,18 +981,10 @@ xfs_buf_attach_iodone(
void (*cb)(xfs_buf_t *, xfs_log_item_t *),
xfs_log_item_t *lip)
{
xfs_log_item_t *head_lip;
ASSERT(xfs_buf_islocked(bp));
lip->li_cb = cb;
head_lip = bp->b_li_list;
if (head_lip) {
lip->li_bio_list = head_lip->li_bio_list;
head_lip->li_bio_list = lip;
} else {
bp->b_li_list = lip;
}
list_add_tail(&lip->li_bio_list, &bp->b_li_list);
ASSERT(bp->b_iodone == NULL ||
bp->b_iodone == xfs_buf_iodone_callbacks);
@@ -1003,12 +994,12 @@ xfs_buf_attach_iodone(
/*
* We can have many callbacks on a buffer. Running the callbacks individually
* can cause a lot of contention on the AIL lock, so we allow for a single
* callback to be able to scan the remaining lip->li_bio_list for other items
* of the same type and callback to be processed in the first call.
* callback to be able to scan the remaining items in bp->b_li_list for other
* items of the same type and callback to be processed in the first call.
*
* As a result, the loop walking the callback list below will also modify the
* list. it removes the first item from the list and then runs the callback.
* The loop then restarts from the new head of the list. This allows the
* The loop then restarts from the new first item int the list. This allows the
* callback to scan and modify the list attached to the buffer and we don't
* have to care about maintaining a next item pointer.
*/
@@ -1025,16 +1016,17 @@ xfs_buf_do_callbacks(
lip->li_cb(bp, lip);
}
while ((lip = bp->b_li_list) != NULL) {
bp->b_li_list = lip->li_bio_list;
ASSERT(lip->li_cb != NULL);
while (!list_empty(&bp->b_li_list)) {
lip = list_first_entry(&bp->b_li_list, struct xfs_log_item,
li_bio_list);
/*
* Clear the next pointer so we don't have any
* Remove the item from the list, so we don't have any
* confusion if the item is added to another buf.
* Don't touch the log item after calling its
* callback, because it could have freed itself.
*/
lip->li_bio_list = NULL;
list_del_init(&lip->li_bio_list);
lip->li_cb(bp, lip);
}
}
@@ -1051,8 +1043,7 @@ STATIC void
xfs_buf_do_callbacks_fail(
struct xfs_buf *bp)
{
struct xfs_log_item *lip = bp->b_li_list;
struct xfs_log_item *next;
struct xfs_log_item *lip;
struct xfs_ail *ailp;
/*
@@ -1060,13 +1051,14 @@ xfs_buf_do_callbacks_fail(
* and xfs_buf_iodone_callback_error, and they have no IO error
* callbacks. Check only for items in b_li_list.
*/
if (lip == NULL)
if (list_empty(&bp->b_li_list))
return;
lip = list_first_entry(&bp->b_li_list, struct xfs_log_item,
li_bio_list);
ailp = lip->li_ailp;
spin_lock(&ailp->xa_lock);
for (; lip; lip = next) {
next = lip->li_bio_list;
list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
if (lip->li_ops->iop_error)
lip->li_ops->iop_error(lip, bp);
}
@@ -1078,7 +1070,7 @@ xfs_buf_iodone_callback_error(
struct xfs_buf *bp)
{
struct xfs_buf_log_item *bip = bp->b_log_item;
struct xfs_log_item *lip = bp->b_li_list;
struct xfs_log_item *lip;
struct xfs_mount *mp;
static ulong lasttime;
static xfs_buftarg_t *lasttarg;
@@ -1089,7 +1081,9 @@ xfs_buf_iodone_callback_error(
* log_item list might be empty. Get the mp from the available
* xfs_log_item
*/
mp = bip ? bip->bli_item.li_mountp : lip->li_mountp;
lip = list_first_entry_or_null(&bp->b_li_list, struct xfs_log_item,
li_bio_list);
mp = lip ? lip->li_mountp : bip->bli_item.li_mountp;
/*
* If we've already decided to shutdown the filesystem because of
@@ -1200,7 +1194,7 @@ xfs_buf_iodone_callbacks(
xfs_buf_do_callbacks(bp);
bp->b_log_item = NULL;
bp->b_li_list = NULL;
list_del_init(&bp->b_li_list);
bp->b_iodone = NULL;
xfs_buf_ioend(bp);
}
@@ -1245,10 +1239,9 @@ xfs_buf_iodone(
bool
xfs_buf_resubmit_failed_buffers(
struct xfs_buf *bp,
struct xfs_log_item *lip,
struct list_head *buffer_list)
{
struct xfs_log_item *next;
struct xfs_log_item *lip;
/*
* Clear XFS_LI_FAILED flag from all items before resubmit
@@ -1256,10 +1249,8 @@ xfs_buf_resubmit_failed_buffers(
* XFS_LI_FAILED set/clear is protected by xa_lock, caller this
* function already have it acquired
*/
for (; lip; lip = next) {
next = lip->li_bio_list;
list_for_each_entry(lip, &bp->b_li_list, li_bio_list)
xfs_clear_li_failed(lip);
}
/* Add this buffer back to the delayed write list */
return xfs_buf_delwri_queue(bp, buffer_list);