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

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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>
This commit is contained in:
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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24
fs/nfs/write.c
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@@ -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;
}