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NFSv4: Use a mutex to protect the per-inode commit lists 

The commit lists can get very large, so using the inode->i_lock can
end up affecting general metadata performance.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
zero-colors
Trond Myklebust 2017-08-01 11:53:49 -04:00
parent b30d2f04c3
commit e824f99ada
5 changed files with 23 additions and 22 deletions
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4
fs/nfs/direct.c
View File

@ -616,13 +616,13 @@ nfs_direct_write_scan_commit_list(struct inode *inode,
struct list_head *list,
struct nfs_commit_info *cinfo)
{
spin_lock(&cinfo->inode->i_lock);
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
#ifdef CONFIG_NFS_V4_1
if (cinfo->ds != NULL && cinfo->ds->nwritten != 0)
NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
#endif
nfs_scan_commit_list(&cinfo->mds->list, list, cinfo, 0);
spin_unlock(&cinfo->inode->i_lock);
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
}
static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)

1
fs/nfs/inode.c
View File

@ -2016,6 +2016,7 @@ static void init_once(void *foo)
nfsi->commit_info.ncommit = 0;
atomic_set(&nfsi->commit_info.rpcs_out, 0);
init_rwsem(&nfsi->rmdir_sem);
mutex_init(&nfsi->commit_mutex);
nfs4_init_once(nfsi);
}

15
fs/nfs/pnfs_nfs.c
View File

@ -98,14 +98,13 @@ pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst,
if (!nfs_lock_request(req))
continue;
kref_get(&req->wb_kref);
if (cond_resched_lock(&cinfo->inode->i_lock))
list_safe_reset_next(req, tmp, wb_list);
nfs_request_remove_commit_list(req, cinfo);
clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
nfs_list_add_request(req, dst);
ret++;
if ((ret == max) && !cinfo->dreq)
break;
cond_resched();
}
return ret;
}
@ -119,7 +118,7 @@ pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
struct list_head *dst = &bucket->committing;
int ret;
lockdep_assert_held(&cinfo->inode->i_lock);
lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max);
if (ret) {
cinfo->ds->nwritten -= ret;
@ -142,7 +141,7 @@ int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo,
{
int i, rv = 0, cnt;
lockdep_assert_held(&cinfo->inode->i_lock);
lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i],
cinfo, max);
@ -162,7 +161,7 @@ void pnfs_generic_recover_commit_reqs(struct list_head *dst,
int nwritten;
int i;
lockdep_assert_held(&cinfo->inode->i_lock);
lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
restart:
for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
nwritten = pnfs_generic_transfer_commit_list(&b->written,
@ -953,12 +952,12 @@ pnfs_layout_mark_request_commit(struct nfs_page *req,
struct list_head *list;
struct pnfs_commit_bucket *buckets;
spin_lock(&cinfo->inode->i_lock);
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
buckets = cinfo->ds->buckets;
list = &buckets[ds_commit_idx].written;
if (list_empty(list)) {
if (!pnfs_is_valid_lseg(lseg)) {
spin_unlock(&cinfo->inode->i_lock);
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
cinfo->completion_ops->resched_write(cinfo, req);
return;
}
@ -975,7 +974,7 @@ pnfs_layout_mark_request_commit(struct nfs_page *req,
cinfo->ds->nwritten++;
nfs_request_add_commit_list_locked(req, list, cinfo);
spin_unlock(&cinfo->inode->i_lock);
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
nfs_mark_page_unstable(req->wb_page, cinfo);
}
EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);

24
fs/nfs/write.c
View File

@ -195,7 +195,7 @@ nfs_page_find_swap_request(struct page *page)
struct nfs_page *req = NULL;
if (!PageSwapCache(page))
return NULL;
spin_lock(&inode->i_lock);
mutex_lock(&nfsi->commit_mutex);
if (PageSwapCache(page)) {
req = nfs_page_search_commits_for_head_request_locked(nfsi,
page);
@ -204,7 +204,7 @@ nfs_page_find_swap_request(struct page *page)
kref_get(&req->wb_kref);
}
}
spin_unlock(&inode->i_lock);
mutex_unlock(&nfsi->commit_mutex);
return req;
}
@ -856,7 +856,8 @@ nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
* number of outstanding requests requiring a commit as well as
* the MM page stats.
*
* The caller must hold cinfo->inode->i_lock, and the nfs_page lock.
* The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the
* nfs_page lock.
*/
void
nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst,
@ -884,9 +885,9 @@ EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked);
void
nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo)
{
spin_lock(&cinfo->inode->i_lock);
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo);
spin_unlock(&cinfo->inode->i_lock);
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
if (req->wb_page)
nfs_mark_page_unstable(req->wb_page, cinfo);
}
@ -964,11 +965,11 @@ nfs_clear_request_commit(struct nfs_page *req)
struct nfs_commit_info cinfo;
nfs_init_cinfo_from_inode(&cinfo, inode);
spin_lock(&inode->i_lock);
mutex_lock(&NFS_I(inode)->commit_mutex);
if (!pnfs_clear_request_commit(req, &cinfo)) {
nfs_request_remove_commit_list(req, &cinfo);
}
spin_unlock(&inode->i_lock);
mutex_unlock(&NFS_I(inode)->commit_mutex);
nfs_clear_page_commit(req->wb_page);
}
}
@ -1027,7 +1028,7 @@ nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
return cinfo->mds->ncommit;
}
/* cinfo->inode->i_lock held by caller */
/* NFS_I(cinfo->inode)->commit_mutex held by caller */
int
nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
struct nfs_commit_info *cinfo, int max)
@ -1039,13 +1040,12 @@ nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
if (!nfs_lock_request(req))
continue;
kref_get(&req->wb_kref);
if (cond_resched_lock(&cinfo->inode->i_lock))
list_safe_reset_next(req, tmp, wb_list);
nfs_request_remove_commit_list(req, cinfo);
nfs_list_add_request(req, dst);
ret++;
if ((ret == max) && !cinfo->dreq)
break;
cond_resched();
}
return ret;
}
@ -1065,7 +1065,7 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst,
{
int ret = 0;
spin_lock(&cinfo->inode->i_lock);
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
if (cinfo->mds->ncommit > 0) {
const int max = INT_MAX;
@ -1073,7 +1073,7 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst,
cinfo, max);
ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
}
spin_unlock(&cinfo->inode->i_lock);
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
return ret;
}

1
include/linux/nfs_fs.h
View File

@ -163,6 +163,7 @@ struct nfs_inode {
/* Readers: in-flight sillydelete RPC calls */
/* Writers: rmdir */
struct rw_semaphore rmdir_sem;
struct mutex commit_mutex;
#if IS_ENABLED(CONFIG_NFS_V4)
struct nfs4_cached_acl *nfs4_acl;