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nfs: fold nfs_page_group_lock_subrequests into nfs_lock_and_join_requests

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Fold nfs_page_group_lock_subrequests into nfs_lock_and_join_requests to
prepare for future changes to this code, and move the helpers to write.c
as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Christoph Hellwig 2024-07-01 07:26:52 +02:00 committed by Anna Schumaker
parent c3f2235782
commit 25edbcac6e
3 changed files with 64 additions and 81 deletions
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77
fs/nfs/pagelist.c
View File

@ -187,83 +187,6 @@ nfs_async_iocounter_wait(struct rpc_task *task, struct nfs_lock_context *l_ctx)
}
EXPORT_SYMBOL_GPL(nfs_async_iocounter_wait);
/*
* nfs_unroll_locks - unlock all newly locked reqs and wait on @req
* @head: head request of page group, must be holding head lock
* @req: request that couldn't lock and needs to wait on the req bit lock
*
* This is a helper function for nfs_lock_and_join_requests
* returns 0 on success, < 0 on error.
*/
static void
nfs_unroll_locks(struct nfs_page *head, struct nfs_page *req)
{
struct nfs_page *tmp;
/* relinquish all the locks successfully grabbed this run */
for (tmp = head->wb_this_page ; tmp != req; tmp = tmp->wb_this_page) {
if (!kref_read(&tmp->wb_kref))
continue;
nfs_unlock_and_release_request(tmp);
}
}
/*
* nfs_page_group_lock_subreq - try to lock a subrequest
* @head: head request of page group
* @subreq: request to lock
*
* This is a helper function for nfs_lock_and_join_requests which
* must be called with the head request and page group both locked.
* On error, it returns with the page group unlocked.
*/
static int
nfs_page_group_lock_subreq(struct nfs_page *head, struct nfs_page *subreq)
{
int ret;
if (!kref_get_unless_zero(&subreq->wb_kref))
return 0;
while (!nfs_lock_request(subreq)) {
nfs_page_group_unlock(head);
ret = nfs_wait_on_request(subreq);
if (!ret)
ret = nfs_page_group_lock(head);
if (ret < 0) {
nfs_unroll_locks(head, subreq);
nfs_release_request(subreq);
return ret;
}
}
return 0;
}
/*
* nfs_page_group_lock_subrequests - try to lock the subrequests
* @head: head request of page group
*
* This is a helper function for nfs_lock_and_join_requests which
* must be called with the head request locked.
*/
int nfs_page_group_lock_subrequests(struct nfs_page *head)
{
struct nfs_page *subreq;
int ret;
ret = nfs_page_group_lock(head);
if (ret < 0)
return ret;
/* lock each request in the page group */
for (subreq = head->wb_this_page; subreq != head;
subreq = subreq->wb_this_page) {
ret = nfs_page_group_lock_subreq(head, subreq);
if (ret < 0)
return ret;
}
nfs_page_group_unlock(head);
return 0;
}
/*
* nfs_page_set_headlock - set the request PG_HEADLOCK
* @req: request that is to be locked

67
fs/nfs/write.c
View File

@ -478,6 +478,57 @@ void nfs_join_page_group(struct nfs_page *head, struct nfs_commit_info *cinfo,
nfs_destroy_unlinked_subrequests(destroy_list, head, inode);
}
/*
* nfs_unroll_locks - unlock all newly locked reqs and wait on @req
* @head: head request of page group, must be holding head lock
* @req: request that couldn't lock and needs to wait on the req bit lock
*
* This is a helper function for nfs_lock_and_join_requests
* returns 0 on success, < 0 on error.
*/
static void
nfs_unroll_locks(struct nfs_page *head, struct nfs_page *req)
{
struct nfs_page *tmp;
/* relinquish all the locks successfully grabbed this run */
for (tmp = head->wb_this_page ; tmp != req; tmp = tmp->wb_this_page) {
if (!kref_read(&tmp->wb_kref))
continue;
nfs_unlock_and_release_request(tmp);
}
}
/*
* nfs_page_group_lock_subreq - try to lock a subrequest
* @head: head request of page group
* @subreq: request to lock
*
* This is a helper function for nfs_lock_and_join_requests which
* must be called with the head request and page group both locked.
* On error, it returns with the page group unlocked.
*/
static int
nfs_page_group_lock_subreq(struct nfs_page *head, struct nfs_page *subreq)
{
int ret;
if (!kref_get_unless_zero(&subreq->wb_kref))
return 0;
while (!nfs_lock_request(subreq)) {
nfs_page_group_unlock(head);
ret = nfs_wait_on_request(subreq);
if (!ret)
ret = nfs_page_group_lock(head);
if (ret < 0) {
nfs_unroll_locks(head, subreq);
nfs_release_request(subreq);
return ret;
}
}
return 0;
}
/*
* nfs_lock_and_join_requests - join all subreqs to the head req
* @folio: the folio used to lookup the "page group" of nfs_page structures
@ -496,7 +547,7 @@ void nfs_join_page_group(struct nfs_page *head, struct nfs_commit_info *cinfo,
static struct nfs_page *nfs_lock_and_join_requests(struct folio *folio)
{
struct inode *inode = folio->mapping->host;
struct nfs_page *head;
struct nfs_page *head, *subreq;
struct nfs_commit_info cinfo;
int ret;
@ -526,11 +577,21 @@ retry:
if (ret < 0)
goto out_unlock;
/* lock each request in the page group */
ret = nfs_page_group_lock_subrequests(head);
ret = nfs_page_group_lock(head);
if (ret < 0)
goto out_unlock;
/* lock each request in the page group */
for (subreq = head->wb_this_page;
subreq != head;
subreq = subreq->wb_this_page) {
ret = nfs_page_group_lock_subreq(head, subreq);
if (ret < 0)
goto out_unlock;
}
nfs_page_group_unlock(head);
nfs_init_cinfo_from_inode(&cinfo, inode);
nfs_join_page_group(head, &cinfo, inode);
return head;

1
include/linux/nfs_page.h
View File

@ -155,7 +155,6 @@ extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
extern int nfs_wait_on_request(struct nfs_page *);
extern void nfs_unlock_request(struct nfs_page *req);
extern void nfs_unlock_and_release_request(struct nfs_page *);
extern int nfs_page_group_lock_subrequests(struct nfs_page *head);
extern void nfs_join_page_group(struct nfs_page *head,
struct nfs_commit_info *cinfo,
struct inode *inode);