ceph: fix up some bare fetches of i_size

We need to use i_size_read(), which properly handles the torn read
case on 32-bit arches.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/caps.c

@@ -1390,7 +1390,7 @@ static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap,
 	arg->flush_tid = flush_tid;
 	arg->oldest_flush_tid = oldest_flush_tid;
 
-	arg->size = inode->i_size;
+	arg->size = i_size_read(inode);
 	ci->i_reported_size = arg->size;
 	arg->max_size = ci->i_wanted_max_size;
 	if (cap == ci->i_auth_cap) {
@@ -1885,7 +1885,7 @@ static int try_nonblocking_invalidate(struct inode *inode)
 
 bool __ceph_should_report_size(struct ceph_inode_info *ci)
 {
-	loff_t size = ci->vfs_inode.i_size;
+	loff_t size = i_size_read(&ci->vfs_inode);
 	/* mds will adjust max size according to the reported size */
 	if (ci->i_flushing_caps & CEPH_CAP_FILE_WR)
 		return false;
@@ -3299,7 +3299,7 @@ static void handle_cap_grant(struct inode *inode,
 	dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
 	     inode, cap, session->s_mds, seq, ceph_cap_string(newcaps));
 	dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
-		inode->i_size);
+		i_size_read(inode));
 
 
 	/*

fs/ceph/inode.c

@@ -617,10 +617,11 @@ int ceph_fill_file_size(struct inode *inode, int issued,
 {
 	struct ceph_inode_info *ci = ceph_inode(inode);
 	int queue_trunc = 0;
+	loff_t isize = i_size_read(inode);
 
 	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
-	    (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
-		dout("size %lld -> %llu\n", inode->i_size, size);
+	    (truncate_seq == ci->i_truncate_seq && size > isize)) {
+		dout("size %lld -> %llu\n", isize, size);
 		if (size > 0 && S_ISDIR(inode->i_mode)) {
 			pr_err("fill_file_size non-zero size for directory\n");
 			size = 0;
@@ -1789,7 +1790,7 @@ bool ceph_inode_set_size(struct inode *inode, loff_t size)
 	bool ret;
 
 	spin_lock(&ci->i_ceph_lock);
-	dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
+	dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
 	i_size_write(inode, size);
 	inode->i_blocks = calc_inode_blocks(size);
 
@@ -2096,20 +2097,19 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
 		}
 	}
 	if (ia_valid & ATTR_SIZE) {
-		dout("setattr %p size %lld -> %lld\n", inode,
-		     inode->i_size, attr->ia_size);
-		if ((issued & CEPH_CAP_FILE_EXCL) &&
-		    attr->ia_size > inode->i_size) {
+		loff_t isize = i_size_read(inode);
+
+		dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
+		if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size > isize) {
 			i_size_write(inode, attr->ia_size);
 			inode->i_blocks = calc_inode_blocks(attr->ia_size);
 			ci->i_reported_size = attr->ia_size;
 			dirtied |= CEPH_CAP_FILE_EXCL;
 			ia_valid |= ATTR_MTIME;
 		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
-			   attr->ia_size != inode->i_size) {
+			   attr->ia_size != isize) {
 			req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
-			req->r_args.setattr.old_size =
-				cpu_to_le64(inode->i_size);
+			req->r_args.setattr.old_size = cpu_to_le64(isize);
 			mask |= CEPH_SETATTR_SIZE;
 			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
 				   CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
@@ -2219,7 +2219,7 @@ int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 		return err;
 
 	if ((attr->ia_valid & ATTR_SIZE) &&
-	    attr->ia_size > max(inode->i_size, fsc->max_file_size))
+	    attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
 		return -EFBIG;
 
 	if ((attr->ia_valid & ATTR_SIZE) &&

fs/ceph/mds_client.c

@@ -3787,7 +3787,7 @@ static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
 		rec.v1.cap_id = cpu_to_le64(cap->cap_id);
 		rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
 		rec.v1.issued = cpu_to_le32(cap->issued);
-		rec.v1.size = cpu_to_le64(inode->i_size);
+		rec.v1.size = cpu_to_le64(i_size_read(inode));
 		ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
 		ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
 		rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);

fs/ceph/snap.c

@@ -605,7 +605,7 @@ int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 
 	BUG_ON(capsnap->writing);
-	capsnap->size = inode->i_size;
+	capsnap->size = i_size_read(inode);
 	capsnap->mtime = inode->i_mtime;
 	capsnap->atime = inode->i_atime;
 	capsnap->ctime = inode->i_ctime;