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NFS: Clean up the write request locking.

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Ensure that we set/clear NFS_PAGE_TAG_LOCKED when the nfs_page is hashed.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2008-01-22 17:13:07 -05:00
parent 8b1f9ee56e
commit acee478afc
3 changed files with 16 additions and 26 deletions
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16
fs/nfs/write.c
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@ -196,7 +196,7 @@ static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
}
/* Update file length */
nfs_grow_file(page, offset, count);
nfs_unlock_request(req);
nfs_clear_page_tag_locked(req);
return 0;
}
@ -252,7 +252,6 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
struct page *page)
{
struct inode *inode = page->mapping->host;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req;
int ret;
@ -263,10 +262,10 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
spin_unlock(&inode->i_lock);
return 0;
}
if (nfs_lock_request_dontget(req))
if (nfs_set_page_tag_locked(req))
break;
/* Note: If we hold the page lock, as is the case in nfs_writepage,
* then the call to nfs_lock_request_dontget() will always
* then the call to nfs_set_page_tag_locked() will always
* succeed provided that someone hasn't already marked the
* request as dirty (in which case we don't care).
*/
@ -280,7 +279,7 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) {
/* This request is marked for commit */
spin_unlock(&inode->i_lock);
nfs_unlock_request(req);
nfs_clear_page_tag_locked(req);
nfs_pageio_complete(pgio);
return 0;
}
@ -288,8 +287,6 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
spin_unlock(&inode->i_lock);
BUG();
}
radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
NFS_PAGE_TAG_LOCKED);
spin_unlock(&inode->i_lock);
nfs_pageio_add_request(pgio, req);
return 0;
@ -381,6 +378,7 @@ static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
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;
}
@ -596,7 +594,7 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
spin_lock(&inode->i_lock);
req = nfs_page_find_request_locked(page);
if (req) {
if (!nfs_lock_request_dontget(req)) {
if (!nfs_set_page_tag_locked(req)) {
int error;
spin_unlock(&inode->i_lock);
@ -646,7 +644,7 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
|| req->wb_page != page
|| !nfs_dirty_request(req)
|| offset > rqend || end < req->wb_offset) {
nfs_unlock_request(req);
nfs_clear_page_tag_locked(req);
return ERR_PTR(-EBUSY);
}