The patch titled
nfs: use GFP_NOFS preloads for radix-tree insertion
has been removed from the -mm tree. Its filename was
nfs-use-gfp_nofs-preloads-for-radix-tree-insertion.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: nfs: use GFP_NOFS preloads for radix-tree insertion
From: Nick Piggin <npiggin@xxxxxxx>
NFS should use GFP_NOFS mode radix tree preloads rather than GFP_ATOMIC
allocations at radix-tree insertion-time. This is important to reduce the
atomic memory requirement.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxx>
Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nfs/write.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)
diff -puN fs/nfs/write.c~nfs-use-gfp_nofs-preloads-for-radix-tree-insertion fs/nfs/write.c
--- a/fs/nfs/write.c~nfs-use-gfp_nofs-preloads-for-radix-tree-insertion
+++ a/fs/nfs/write.c
@@ -360,15 +360,13 @@ int nfs_writepages(struct address_space
/*
* Insert a write request into an inode
*/
-static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
+static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
{
struct nfs_inode *nfsi = NFS_I(inode);
int error;
error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
- BUG_ON(error == -EEXIST);
- if (error)
- return error;
+ BUG_ON(error);
if (!nfsi->npages) {
igrab(inode);
if (nfs_have_delegation(inode, FMODE_WRITE))
@@ -378,8 +376,8 @@ static int nfs_inode_add_request(struct
set_page_private(req->wb_page, (unsigned long)req);
nfsi->npages++;
kref_get(&req->wb_kref);
- radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, NFS_PAGE_TAG_LOCKED);
- return 0;
+ radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
+ NFS_PAGE_TAG_LOCKED);
}
/*
@@ -591,6 +589,13 @@ static struct nfs_page * nfs_update_requ
/* Loop over all inode entries and see if we find
* A request for the page we wish to update
*/
+ if (new) {
+ if (radix_tree_preload(GFP_NOFS)) {
+ nfs_release_request(new);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
spin_lock(&inode->i_lock);
req = nfs_page_find_request_locked(page);
if (req) {
@@ -601,28 +606,27 @@ static struct nfs_page * nfs_update_requ
error = nfs_wait_on_request(req);
nfs_release_request(req);
if (error < 0) {
- if (new)
+ if (new) {
+ radix_tree_preload_end();
nfs_release_request(new);
+ }
return ERR_PTR(error);
}
continue;
}
spin_unlock(&inode->i_lock);
- if (new)
+ if (new) {
+ radix_tree_preload_end();
nfs_release_request(new);
+ }
break;
}
if (new) {
- int error;
nfs_lock_request_dontget(new);
- error = nfs_inode_add_request(inode, new);
- if (error) {
- spin_unlock(&inode->i_lock);
- nfs_unlock_request(new);
- return ERR_PTR(error);
- }
+ nfs_inode_add_request(inode, new);
spin_unlock(&inode->i_lock);
+ radix_tree_preload_end();
req = new;
goto zero_page;
}
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
git-drm.patch
git-kvm.patch
git-nfsd.patch
mm-remove-nopage.patch
reiser4.patch
reiser4-correct-references-to-filemap_nopage.patch
-
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