[PATCH RFC 1/2] Revert "ceph: make client zero partial trailing block on truncate"

[xiubli@redhat.com]

From: Xiubo Li <xiubli@redhat.com>

This reverts commit c97968122078ce0380cd8db405b8505a8b0a55d8.
---
 fs/ceph/file.c  |  3 ++-
 fs/ceph/inode.c | 23 ++---------------------
 fs/ceph/super.h |  1 -
 3 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 3db7a3df4041..6e677b40410e 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2247,7 +2247,8 @@ static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
 		ceph_zero_partial_page(inode, offset, length);
 }
 
-int ceph_zero_partial_object(struct inode *inode, loff_t offset, loff_t *length)
+static int ceph_zero_partial_object(struct inode *inode,
+				    loff_t offset, loff_t *length)
 {
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 03530793c969..1a4c9bc485fc 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2391,6 +2391,7 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr, struct ceph_iattr *c
 					cpu_to_le64(round_up(isize,
 							     CEPH_FSCRYPT_BLOCK_SIZE));
 				req->r_fscrypt_file = attr->ia_size;
+				/* FIXME: client must zero out any partial blocks! */
 			} else {
 				req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
 				req->r_args.setattr.old_size = cpu_to_le64(isize);
@@ -2479,28 +2480,8 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr, struct ceph_iattr *c
 	ceph_mdsc_put_request(req);
 	ceph_free_cap_flush(prealloc_cf);
 
-	if (err >= 0 && (mask & (CEPH_SETATTR_SIZE|CEPH_SETATTR_FSCRYPT_FILE))) {
+	if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
 		__ceph_do_pending_vmtruncate(inode);
-		if (mask & CEPH_SETATTR_FSCRYPT_FILE) {
-			loff_t orig_len, len;
-
-			len = round_up(attr->ia_size, CEPH_FSCRYPT_BLOCK_SIZE) - attr->ia_size;
-			orig_len = len;
-
-			/*
-			 * FIXME: this is just doing the truncating the last OSD
-			 * 	  object, but for "real" fscrypt support, we need
-			 * 	  to do a RMW with the end of the block zeroed out.
-			 */
-			if (len) {
-				err = ceph_zero_partial_object(inode, attr->ia_size, &len);
-				/* This had better not be shortened */
-				WARN_ONCE(!err && len != orig_len,
-					  "attr->ia_size=%lld orig_len=%lld len=%lld\n",
-					  attr->ia_size, orig_len, len);
-			}
-		}
-	}
 
 	return err;
 }
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 6d4a22c6d32d..7f3976b3319d 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1236,7 +1236,6 @@ extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 extern int ceph_release(struct inode *inode, struct file *filp);
 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
 				  char *data, size_t len);
-int ceph_zero_partial_object(struct inode *inode, loff_t offset, loff_t *length);
 
 /* dir.c */
 extern const struct file_operations ceph_dir_fops;
-- 
2.27.0