fs/9p: Add buffered write support for v9fs.
We can now support writeable mmaps.
Based on the original patch from Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index e966f15..f7b571d 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -44,6 +44,8 @@
#include "fid.h"
#include "cache.h"
+static const struct vm_operations_struct v9fs_file_vm_ops;
+
/**
* v9fs_file_open - open a file (or directory)
* @inode: inode to be opened
@@ -503,6 +505,7 @@
return retval;
}
+
static int v9fs_file_fsync(struct file *filp, int datasync)
{
struct p9_fid *fid;
@@ -532,28 +535,71 @@
return retval;
}
+static int
+v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int retval;
+
+ retval = generic_file_mmap(file, vma);
+ if (!retval)
+ vma->vm_ops = &v9fs_file_vm_ops;
+
+ return retval;
+}
+
+static int
+v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct page *page = vmf->page;
+ struct file *filp = vma->vm_file;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+
+
+ P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
+ page, (unsigned long)filp->private_data);
+
+ /* make sure the cache has finished storing the page */
+ v9fs_fscache_wait_on_page_write(inode, page);
+ BUG_ON(!inode->i_private);
+ lock_page(page);
+ if (page->mapping != inode->i_mapping)
+ goto out_unlock;
+
+ return VM_FAULT_LOCKED;
+out_unlock:
+ unlock_page(page);
+ return VM_FAULT_NOPAGE;
+}
+
+static const struct vm_operations_struct v9fs_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = v9fs_vm_page_mkwrite,
+};
+
const struct file_operations v9fs_cached_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
+ .write = do_sync_write,
.aio_read = generic_file_aio_read,
- .write = v9fs_file_write,
+ .aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock,
- .mmap = generic_file_readonly_mmap,
+ .mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync,
};
const struct file_operations v9fs_cached_file_operations_dotl = {
.llseek = generic_file_llseek,
.read = do_sync_read,
+ .write = do_sync_write,
.aio_read = generic_file_aio_read,
- .write = v9fs_file_write,
+ .aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock_dotl,
.flock = v9fs_file_flock_dotl,
- .mmap = generic_file_readonly_mmap,
+ .mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync_dotl,
};