Copy will use this to set up a commit request for a generic range. I
don't want to allocate a new pagecache entry for the file, so I needed
to change parts of the commit path to handle requests with a null
wb_page.
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
---
Checking for wb_page everywhere feels like a hack, but I don't really see
any other way of doing this. Suggestions welcome!
---
fs/nfs/internal.h | 1 +
fs/nfs/pagelist.c | 6 ++++--
fs/nfs/write.c | 41 +++++++++++++++++++++++++++++++++++++----
3 files changed, 42 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 9a547aa..7a3778c 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -477,6 +477,7 @@ void nfs_mark_request_commit(struct nfs_page *req,
u32 ds_commit_idx);
int nfs_write_need_commit(struct nfs_pgio_header *);
void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
+int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
int how, struct nfs_commit_info *cinfo);
void nfs_retry_commit(struct list_head *page_list,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 8ce4f61..c3c3555 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -341,8 +341,10 @@ nfs_create_request(struct nfs_open_context *ctx, struct page *page,
* long write-back delay. This will be adjusted in
* update_nfs_request below if the region is not locked. */
req->wb_page = page;
- req->wb_index = page_file_index(page);
- page_cache_get(page);
+ if (page) {
+ req->wb_index = page_file_index(page);
+ page_cache_get(page);
+ }
req->wb_offset = offset;
req->wb_pgbase = offset;
req->wb_bytes = count;
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 5754835..a82765b9 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -737,7 +737,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
head = req->wb_head;
spin_lock(&inode->i_lock);
- if (likely(!PageSwapCache(head->wb_page))) {
+ if (likely(head->wb_page && !PageSwapCache(head->wb_page))) {
set_page_private(head->wb_page, 0);
ClearPagePrivate(head->wb_page);
smp_mb__after_atomic();
@@ -759,7 +759,8 @@ static void nfs_inode_remove_request(struct nfs_page *req)
static void
nfs_mark_request_dirty(struct nfs_page *req)
{
- __set_page_dirty_nobuffers(req->wb_page);
+ if (req->wb_page)
+ __set_page_dirty_nobuffers(req->wb_page);
}
/*
@@ -835,7 +836,8 @@ nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo)
spin_lock(cinfo->lock);
nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo);
spin_unlock(cinfo->lock);
- nfs_mark_page_unstable(req->wb_page, cinfo);
+ if (req->wb_page)
+ nfs_mark_page_unstable(req->wb_page, cinfo);
}
EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
@@ -1724,6 +1726,36 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how,
return -ENOMEM;
}
+int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf)
+{
+ struct inode *inode = file_inode(file);
+ struct nfs_open_context *open;
+ struct nfs_commit_info cinfo;
+ struct nfs_page *req;
+ int ret;
+
+ open = get_nfs_open_context(nfs_file_open_context(file));
+ req = nfs_create_request(open, NULL, NULL, 0, i_size_read(inode));
+ if (!req) {
+ ret = -ENOMEM;
+ goto out_put;
+ }
+
+ nfs_init_cinfo_from_inode(&cinfo, inode);
+
+ memcpy(&req->wb_verf, verf, sizeof(struct nfs_write_verifier));
+ nfs_request_add_commit_list(req, &cinfo);
+ ret = nfs_commit_inode(inode, FLUSH_SYNC);
+ if (ret > 0)
+ ret = 0;
+
+ nfs_free_request(req);
+out_put:
+ put_nfs_open_context(open);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nfs_commit_file);
+
/*
* COMMIT call returned
*/
@@ -1748,7 +1780,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
while (!list_empty(&data->pages)) {
req = nfs_list_entry(data->pages.next);
nfs_list_remove_request(req);
- nfs_clear_page_commit(req->wb_page);
+ if (req->wb_page)
+ nfs_clear_page_commit(req->wb_page);
dprintk("NFS: commit (%s/%llu %d@%lld)",
req->wb_context->dentry->d_sb->s_id,
--
2.7.2
--
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