9p: soften invalidation in loose_mode
Loose mode in 9p utilizes the page cache without respecting coherency with
the server. Any writes previously invaldiated the entire mapping for a file.
This patch softens the behavior to only invalidate the region of the actual
write.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 7166916..ba4b1ca 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -162,15 +162,17 @@
fid = filp->private_data;
ret = p9_client_uwrite(fid, data, *offset, count);
- if (ret > 0)
+ if (ret > 0) {
+ invalidate_inode_pages2_range(inode->i_mapping, *offset,
+ *offset+ret);
*offset += ret;
+ }
if (*offset > inode->i_size) {
inode->i_size = *offset;
inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
}
- invalidate_inode_pages2(inode->i_mapping);
return ret;
}