#include "v9fs.h"
#include "v9fs_vfs.h"
#include "cache.h"
+#include "fid.h"
/**
- * v9fs_vfs_readpage - read an entire page in from 9P
+ * v9fs_fid_readpage - read an entire page in from 9P
*
- * @filp: file being read
+ * @fid: fid being read
* @page: structure to page
*
*/
-
-static int v9fs_vfs_readpage(struct file *filp, struct page *page)
+static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
{
int retval;
loff_t offset;
buffer = kmap(page);
offset = page_offset(page);
- retval = v9fs_file_readn(filp, buffer, NULL, PAGE_CACHE_SIZE, offset);
+ retval = v9fs_fid_readn(fid, buffer, NULL, PAGE_CACHE_SIZE, offset);
if (retval < 0) {
v9fs_uncache_page(inode, page);
goto done;
}
/**
+ * v9fs_vfs_readpage - read an entire page in from 9P
+ *
+ * @filp: file being read
+ * @page: structure to page
+ *
+ */
+
+static int v9fs_vfs_readpage(struct file *filp, struct page *page)
+{
+ return v9fs_fid_readpage(filp->private_data, page);
+}
+
+/**
* v9fs_vfs_readpages - read a set of pages from 9P
*
* @filp: file being read
{
if (PagePrivate(page))
return 0;
-
return v9fs_fscache_release_page(page, gfp);
}
static void v9fs_invalidate_page(struct page *page, unsigned long offset)
{
+ /*
+ * If called with zero offset, we should release
+ * the private state assocated with the page
+ */
if (offset == 0)
v9fs_fscache_invalidate_page(page);
}
+static int v9fs_vfs_writepage_locked(struct page *page)
+{
+ char *buffer;
+ int retval, len;
+ loff_t offset, size;
+ mm_segment_t old_fs;
+ struct v9fs_inode *v9inode;
+ struct inode *inode = page->mapping->host;
+
+ v9inode = V9FS_I(inode);
+ size = i_size_read(inode);
+ if (page->index == size >> PAGE_CACHE_SHIFT)
+ len = size & ~PAGE_CACHE_MASK;
+ else
+ len = PAGE_CACHE_SIZE;
+
+ set_page_writeback(page);
+
+ buffer = kmap(page);
+ offset = page_offset(page);
+
+ old_fs = get_fs();
+ set_fs(get_ds());
+ /* We should have writeback_fid always set */
+ BUG_ON(!v9inode->writeback_fid);
+
+ retval = v9fs_file_write_internal(inode,
+ v9inode->writeback_fid,
+ (__force const char __user *)buffer,
+ len, &offset, 0);
+ if (retval > 0)
+ retval = 0;
+
+ set_fs(old_fs);
+ kunmap(page);
+ end_page_writeback(page);
+ return retval;
+}
+
+static int v9fs_vfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ int retval;
+
+ retval = v9fs_vfs_writepage_locked(page);
+ if (retval < 0) {
+ if (retval == -EAGAIN) {
+ redirty_page_for_writepage(wbc, page);
+ retval = 0;
+ } else {
+ SetPageError(page);
+ mapping_set_error(page->mapping, retval);
+ }
+ } else
+ retval = 0;
+
+ unlock_page(page);
+ return retval;
+}
+
/**
* v9fs_launder_page - Writeback a dirty page
- * Since the writes go directly to the server, we simply return a 0
- * here to indicate success.
- *
* Returns 0 on success.
*/
static int v9fs_launder_page(struct page *page)
{
+ int retval;
+ struct inode *inode = page->mapping->host;
+
+ v9fs_fscache_wait_on_page_write(inode, page);
+ if (clear_page_dirty_for_io(page)) {
+ retval = v9fs_vfs_writepage_locked(page);
+ if (retval)
+ return retval;
+ }
return 0;
}
* with an error.
*
*/
-ssize_t v9fs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t pos, unsigned long nr_segs)
+static ssize_t
+v9fs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
+ loff_t pos, unsigned long nr_segs)
{
+ /*
+ * FIXME
+ * Now that we do caching with cache mode enabled, We need
+ * to support direct IO
+ */
P9_DPRINTK(P9_DEBUG_VFS, "v9fs_direct_IO: v9fs_direct_IO (%s) "
"off/no(%lld/%lu) EINVAL\n",
iocb->ki_filp->f_path.dentry->d_name.name,
return -EINVAL;
}
+
+static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int retval = 0;
+ struct page *page;
+ struct v9fs_inode *v9inode;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ struct inode *inode = mapping->host;
+
+ v9inode = V9FS_I(inode);
+start:
+ page = grab_cache_page_write_begin(mapping, index, flags);
+ if (!page) {
+ retval = -ENOMEM;
+ goto out;
+ }
+ BUG_ON(!v9inode->writeback_fid);
+ if (PageUptodate(page))
+ goto out;
+
+ if (len == PAGE_CACHE_SIZE)
+ goto out;
+
+ retval = v9fs_fid_readpage(v9inode->writeback_fid, page);
+ page_cache_release(page);
+ if (!retval)
+ goto start;
+out:
+ *pagep = page;
+ return retval;
+}
+
+static int v9fs_write_end(struct file *filp, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ loff_t last_pos = pos + copied;
+ struct inode *inode = page->mapping->host;
+
+ if (unlikely(copied < len)) {
+ /*
+ * zero out the rest of the area
+ */
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+
+ zero_user(page, from + copied, len - copied);
+ flush_dcache_page(page);
+ }
+
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
+ /*
+ * No need to use i_size_read() here, the i_size
+ * cannot change under us because we hold the i_mutex.
+ */
+ if (last_pos > inode->i_size) {
+ inode_add_bytes(inode, last_pos - inode->i_size);
+ i_size_write(inode, last_pos);
+ }
+ set_page_dirty(page);
+ unlock_page(page);
+ page_cache_release(page);
+
+ return copied;
+}
+
+
const struct address_space_operations v9fs_addr_operations = {
- .readpage = v9fs_vfs_readpage,
- .readpages = v9fs_vfs_readpages,
- .releasepage = v9fs_release_page,
- .invalidatepage = v9fs_invalidate_page,
- .launder_page = v9fs_launder_page,
- .direct_IO = v9fs_direct_IO,
+ .readpage = v9fs_vfs_readpage,
+ .readpages = v9fs_vfs_readpages,
+ .set_page_dirty = __set_page_dirty_nobuffers,
+ .writepage = v9fs_vfs_writepage,
+ .write_begin = v9fs_write_begin,
+ .write_end = v9fs_write_end,
+ .releasepage = v9fs_release_page,
+ .invalidatepage = v9fs_invalidate_page,
+ .launder_page = v9fs_launder_page,
+ .direct_IO = v9fs_direct_IO,
};
projects / platform / kernel / linux-rpi.git / blobdiff