@@ -172,18 +172,18 @@ nfs_page_private_request(struct page *page)
static struct nfs_page *
nfs_page_find_private_request(struct page *page)
{
- struct inode *inode = page_file_mapping(page)->host;
+ struct address_space *mapping = page_file_mapping(page);
struct nfs_page *req;
if (!PagePrivate(page))
return NULL;
- spin_lock(&inode->i_lock);
+ spin_lock(&mapping->private_lock);
req = nfs_page_private_request(page);
if (req) {
WARN_ON_ONCE(req->wb_head != req);
kref_get(&req->wb_kref);
}
- spin_unlock(&inode->i_lock);
+ spin_unlock(&mapping->private_lock);
return req;
}
@@ -743,6 +743,7 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
*/
static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
{
+ struct address_space *mapping = page_file_mapping(req->wb_page);
struct nfs_inode *nfsi = NFS_I(inode);
WARN_ON_ONCE(req->wb_this_page != req);
@@ -750,19 +751,23 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
/* Lock the request! */
nfs_lock_request(req);
- spin_lock(&inode->i_lock);
- if (!nfs_have_writebacks(inode) &&
- NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
- inode->i_version++;
/*
* Swap-space should not get truncated. Hence no need to plug the race
* with invalidate/truncate.
*/
+ spin_lock(&mapping->private_lock);
+ if (!nfs_have_writebacks(inode) &&
+ NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) {
+ spin_lock(&inode->i_lock);
+ inode->i_version++;
+ spin_unlock(&inode->i_lock);
+ }
if (likely(!PageSwapCache(req->wb_page))) {
set_bit(PG_MAPPED, &req->wb_flags);
SetPagePrivate(req->wb_page);
set_page_private(req->wb_page, (unsigned long)req);
}
+ spin_unlock(&mapping->private_lock);
atomic_long_inc(&nfsi->nrequests);
/* this a head request for a page group - mark it as having an
* extra reference so sub groups can follow suit.
@@ -770,7 +775,6 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
* adding subrequests. */
WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
kref_get(&req->wb_kref);
- spin_unlock(&inode->i_lock);
}
/*
@@ -778,7 +782,8 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
*/
static void nfs_inode_remove_request(struct nfs_page *req)
{
- struct inode *inode = d_inode(req->wb_context->dentry);
+ struct address_space *mapping = page_file_mapping(req->wb_page);
+ struct inode *inode = mapping->host;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *head;
@@ -786,13 +791,13 @@ static void nfs_inode_remove_request(struct nfs_page *req)
if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
head = req->wb_head;
- spin_lock(&inode->i_lock);
+ spin_lock(&mapping->private_lock);
if (likely(head->wb_page && !PageSwapCache(head->wb_page))) {
set_page_private(head->wb_page, 0);
ClearPagePrivate(head->wb_page);
clear_bit(PG_MAPPED, &head->wb_flags);
}
- spin_unlock(&inode->i_lock);
+ spin_unlock(&mapping->private_lock);
}
if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
Switch from using the inode->i_lock for this to avoid contention with other metadata manipulation. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> --- fs/nfs/write.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-)