[RFC,43/76] cachefiles: Round the cachefile size up to DIO block size

Commit Message

David Howells Nov. 20, 2020, 3:11 p.m. UTC

Round the size of a cachefile up to DIO block size so that we can always
read back the last partial page of a file using direct I/O.

Signed-off-by: David Howells <[e-mail]>
---

 fs/cachefiles/interface.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index a20917cb4667..0e3d5b5ffc55 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -184,6 +184,17 @@  static void cachefiles_update_object(struct fscache_object *_object)
 			cachefiles_remove_object_xattr(cache, object->dentry);
 			goto out;
 		}
+
+		object_size = round_up(object_size, CACHEFILES_DIO_BLOCK_SIZE);
+		_debug("trunc %llx -> %llx", i_size_read(d_inode(object->dentry)), object_size);
+		if (i_size_read(d_inode(object->dentry)) < object_size) {
+			ret = vfs_truncate(&path, object_size);
+			if (ret < 0) {
+				cachefiles_io_error_obj(object, "Trunc-to-dio-size failed");
+				cachefiles_remove_object_xattr(cache, object->dentry);
+				goto out;
+			}
+		}
 	}
 
 	cachefiles_set_object_xattr(object, XATTR_REPLACE);
@@ -354,6 +365,7 @@  static int cachefiles_attr_changed(struct cachefiles_object *object)
 	int ret;
 
 	ni_size = object->fscache.cookie->object_size;
+	ni_size = round_up(ni_size, CACHEFILES_DIO_BLOCK_SIZE);
 
 	_enter("{OBJ%x},[%llu]",
 	       object->fscache.debug_id, (unsigned long long) ni_size);
@@ -422,6 +434,7 @@  static bool cachefiles_invalidate_object(struct fscache_object *_object)
 			     struct cachefiles_cache, cache);
 
 	ni_size = object->fscache.cookie->object_size;
+	ni_size = round_up(ni_size, CACHEFILES_DIO_BLOCK_SIZE);
 
 	_enter("{OBJ%x},[%llu]",
 	       object->fscache.debug_id, (unsigned long long)ni_size);