Merge tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:
 "I've managed to get xfstests kind of working with afs. Here are a set
  of patches that fix most of the bugs found.

  There are a number of primary issues:

   - Incorrect handling of mtime and non-handling of ctime. It might be
     argued, that the latter isn't a bug since the AFS protocol doesn't
     support ctime, but I should probably still update it locally.

   - Shared-write mmap, truncate and writeback bugs. This includes not
     changing i_size under the callback lock, overwriting local i_size
     with the reply from the server after a partial writeback, not
     limiting the writeback from an mmapped page to EOF.

   - Checks for an abort code indicating that the primary vnode in an
     operation was deleted by a third-party are done in the wrong place.

   - Silly rename bugs. This includes an incomplete conversion to the
     new operation handling, duplicate nlink handling, nlink changing
     not being done inside the callback lock and insufficient handling
     of third-party conflicting directory changes.

  And some secondary ones:

   - The UAEOVERFLOW abort code should map to EOVERFLOW not EREMOTEIO.

   - Remove a couple of unused or incompletely used bits.

   - Remove a couple of redundant success checks.

  These seem to fix all the data-corruption bugs found by

	./check -afs -g quick

  along with the obvious silly rename bugs and time bugs.

  There are still some test failures, but they seem to fall into two
  classes: firstly, the authentication/security model is different to
  the standard UNIX model and permission is arbitrated by the server and
  cached locally; and secondly, there are a number of features that AFS
  does not support (such as mknod). But in these cases, the tests
  themselves need to be adapted or skipped.

  Using the in-kernel afs client with xfstests also found a bug in the
  AuriStor AFS server that has been fixed for a future release"

* tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix silly rename
  afs: afs_vnode_commit_status() doesn't need to check the RPC error
  afs: Fix use of afs_check_for_remote_deletion()
  afs: Remove afs_operation::abort_code
  afs: Fix yfs_fs_fetch_status() to honour vnode selector
  afs: Remove yfs_fs_fetch_file_status() as it's not used
  afs: Fix the mapping of the UAEOVERFLOW abort code
  afs: Fix truncation issues and mmap writeback size
  afs: Concoct ctimes
  afs: Fix EOF corruption
  afs: afs_write_end() should change i_size under the right lock
  afs: Fix non-setting of mtime when writing into mmap

fs/afs/dir.c

@@ -648,7 +648,7 @@ static void afs_do_lookup_success(struct afs_operation *op)
 			vp = &op->file[0];
 			abort_code = vp->scb.status.abort_code;
 			if (abort_code != 0) {
-				op->abort_code = abort_code;
+				op->ac.abort_code = abort_code;
 				op->error = afs_abort_to_error(abort_code);
 			}
 			break;
@@ -696,10 +696,11 @@ static const struct afs_operation_ops afs_inline_bulk_status_operation = {
 	.success	= afs_do_lookup_success,
 };
 
-static const struct afs_operation_ops afs_fetch_status_operation = {
+static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
 	.issue_afs_rpc	= afs_fs_fetch_status,
 	.issue_yfs_rpc	= yfs_fs_fetch_status,
 	.success	= afs_do_lookup_success,
+	.aborted	= afs_check_for_remote_deletion,
 };
 
 /*
@@ -1236,6 +1237,17 @@ void afs_d_release(struct dentry *dentry)
 	_enter("%pd", dentry);
 }
 
+void afs_check_for_remote_deletion(struct afs_operation *op)
+{
+	struct afs_vnode *vnode = op->file[0].vnode;
+
+	switch (op->ac.abort_code) {
+	case VNOVNODE:
+		set_bit(AFS_VNODE_DELETED, &vnode->flags);
+		afs_break_callback(vnode, afs_cb_break_for_deleted);
+	}
+}
+
 /*
  * Create a new inode for create/mkdir/symlink
  */
@@ -1268,7 +1280,7 @@ static void afs_vnode_new_inode(struct afs_operation *op)
 static void afs_create_success(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, op->file[0].vnode);
+	op->ctime = op->file[0].scb.status.mtime_client;
 	afs_vnode_commit_status(op, &op->file[0]);
 	afs_update_dentry_version(op, &op->file[0], op->dentry);
 	afs_vnode_new_inode(op);
@@ -1302,6 +1314,7 @@ static const struct afs_operation_ops afs_mkdir_operation = {
 	.issue_afs_rpc	= afs_fs_make_dir,
 	.issue_yfs_rpc	= yfs_fs_make_dir,
 	.success	= afs_create_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_create_edit_dir,
 	.put		= afs_create_put,
 };
@@ -1325,6 +1338,7 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 
 	afs_op_set_vnode(op, 0, dvnode);
 	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
 	op->dentry	= dentry;
 	op->create.mode	= S_IFDIR | mode;
 	op->create.reason = afs_edit_dir_for_mkdir;
@@ -1350,7 +1364,7 @@ static void afs_dir_remove_subdir(struct dentry *dentry)
 static void afs_rmdir_success(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, op->file[0].vnode);
+	op->ctime = op->file[0].scb.status.mtime_client;
 	afs_vnode_commit_status(op, &op->file[0]);
 	afs_update_dentry_version(op, &op->file[0], op->dentry);
 }
@@ -1382,6 +1396,7 @@ static const struct afs_operation_ops afs_rmdir_operation = {
 	.issue_afs_rpc	= afs_fs_remove_dir,
 	.issue_yfs_rpc	= yfs_fs_remove_dir,
 	.success	= afs_rmdir_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_rmdir_edit_dir,
 	.put		= afs_rmdir_put,
 };
@@ -1404,6 +1419,7 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
 
 	afs_op_set_vnode(op, 0, dvnode);
 	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
 
 	op->dentry	= dentry;
 	op->ops		= &afs_rmdir_operation;
@@ -1479,7 +1495,8 @@ static void afs_dir_remove_link(struct afs_operation *op)
 static void afs_unlink_success(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, op->file[0].vnode);
+	op->ctime = op->file[0].scb.status.mtime_client;
+	afs_check_dir_conflict(op, &op->file[0]);
 	afs_vnode_commit_status(op, &op->file[0]);
 	afs_vnode_commit_status(op, &op->file[1]);
 	afs_update_dentry_version(op, &op->file[0], op->dentry);
@@ -1511,6 +1528,7 @@ static const struct afs_operation_ops afs_unlink_operation = {
 	.issue_afs_rpc	= afs_fs_remove_file,
 	.issue_yfs_rpc	= yfs_fs_remove_file,
 	.success	= afs_unlink_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_unlink_edit_dir,
 	.put		= afs_unlink_put,
 };
@@ -1537,6 +1555,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 
 	afs_op_set_vnode(op, 0, dvnode);
 	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
 
 	/* Try to make sure we have a callback promise on the victim. */
 	ret = afs_validate(vnode, op->key);
@@ -1561,9 +1580,25 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 	spin_unlock(&dentry->d_lock);
 
 	op->file[1].vnode = vnode;
+	op->file[1].update_ctime = true;
+	op->file[1].op_unlinked = true;
 	op->dentry	= dentry;
 	op->ops		= &afs_unlink_operation;
-	return afs_do_sync_operation(op);
+	afs_begin_vnode_operation(op);
+	afs_wait_for_operation(op);
+
+	/* If there was a conflict with a third party, check the status of the
+	 * unlinked vnode.
+	 */
+	if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+		op->file[1].update_ctime = false;
+		op->fetch_status.which = 1;
+		op->ops = &afs_fetch_status_operation;
+		afs_begin_vnode_operation(op);
+		afs_wait_for_operation(op);
+	}
+
+	return afs_put_operation(op);
 
 error:
 	return afs_put_operation(op);
@@ -1573,6 +1608,7 @@ static const struct afs_operation_ops afs_create_operation = {
 	.issue_afs_rpc	= afs_fs_create_file,
 	.issue_yfs_rpc	= yfs_fs_create_file,
 	.success	= afs_create_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_create_edit_dir,
 	.put		= afs_create_put,
 };
@@ -1601,6 +1637,7 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 
 	afs_op_set_vnode(op, 0, dvnode);
 	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
 
 	op->dentry	= dentry;
 	op->create.mode	= S_IFREG | mode;
@@ -1620,6 +1657,7 @@ static void afs_link_success(struct afs_operation *op)
 	struct afs_vnode_param *vp = &op->file[1];
 
 	_enter("op=%08x", op->debug_id);
+	op->ctime = dvp->scb.status.mtime_client;
 	afs_vnode_commit_status(op, dvp);
 	afs_vnode_commit_status(op, vp);
 	afs_update_dentry_version(op, dvp, op->dentry);
@@ -1640,6 +1678,7 @@ static const struct afs_operation_ops afs_link_operation = {
 	.issue_afs_rpc	= afs_fs_link,
 	.issue_yfs_rpc	= yfs_fs_link,
 	.success	= afs_link_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_create_edit_dir,
 	.put		= afs_link_put,
 };
@@ -1672,6 +1711,8 @@ static int afs_link(struct dentry *from, struct inode *dir,
 	afs_op_set_vnode(op, 0, dvnode);
 	afs_op_set_vnode(op, 1, vnode);
 	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
+	op->file[1].update_ctime = true;
 
 	op->dentry		= dentry;
 	op->dentry_2		= from;
@@ -1689,6 +1730,7 @@ static const struct afs_operation_ops afs_symlink_operation = {
 	.issue_afs_rpc	= afs_fs_symlink,
 	.issue_yfs_rpc	= yfs_fs_symlink,
 	.success	= afs_create_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_create_edit_dir,
 	.put		= afs_create_put,
 };
@@ -1740,9 +1782,13 @@ static void afs_rename_success(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
 
+	op->ctime = op->file[0].scb.status.mtime_client;
+	afs_check_dir_conflict(op, &op->file[1]);
 	afs_vnode_commit_status(op, &op->file[0]);
-	if (op->file[1].vnode != op->file[0].vnode)
+	if (op->file[1].vnode != op->file[0].vnode) {
+		op->ctime = op->file[1].scb.status.mtime_client;
 		afs_vnode_commit_status(op, &op->file[1]);
+	}
 }
 
 static void afs_rename_edit_dir(struct afs_operation *op)
@@ -1860,6 +1906,8 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
 	op->file[0].dv_delta = 1;
 	op->file[1].dv_delta = 1;
+	op->file[0].update_ctime = true;
+	op->file[1].update_ctime = true;
 
 	op->dentry		= old_dentry;
 	op->dentry_2		= new_dentry;

fs/afs/dir_silly.c

@@ -16,6 +16,7 @@ static void afs_silly_rename_success(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
 
+	afs_check_dir_conflict(op, &op->file[0]);
 	afs_vnode_commit_status(op, &op->file[0]);
 }
 
@@ -69,6 +70,11 @@ static int afs_do_silly_rename(struct afs_vnode *dvnode, struct afs_vnode *vnode
 		return PTR_ERR(op);
 
 	afs_op_set_vnode(op, 0, dvnode);
+	afs_op_set_vnode(op, 1, dvnode);
+	op->file[0].dv_delta = 1;
+	op->file[1].dv_delta = 1;
+	op->file[0].update_ctime = true;
+	op->file[1].update_ctime = true;
 
 	op->dentry		= old;
 	op->dentry_2		= new;
@@ -129,6 +135,7 @@ int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
 	switch (ret) {
 	case 0:
 		/* The rename succeeded. */
+		set_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags);
 		d_move(dentry, sdentry);
 		break;
 	case -ERESTARTSYS:
@@ -148,19 +155,11 @@ int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
 
 static void afs_silly_unlink_success(struct afs_operation *op)
 {
-	struct afs_vnode *vnode = op->file[1].vnode;
-
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, op->file[0].vnode);
+	afs_check_dir_conflict(op, &op->file[0]);
 	afs_vnode_commit_status(op, &op->file[0]);
 	afs_vnode_commit_status(op, &op->file[1]);
 	afs_update_dentry_version(op, &op->file[0], op->dentry);
-
-	drop_nlink(&vnode->vfs_inode);
-	if (vnode->vfs_inode.i_nlink == 0) {
-		set_bit(AFS_VNODE_DELETED, &vnode->flags);
-		clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
-	}
 }
 
 static void afs_silly_unlink_edit_dir(struct afs_operation *op)
@@ -181,6 +180,7 @@ static const struct afs_operation_ops afs_silly_unlink_operation = {
 	.issue_afs_rpc	= afs_fs_remove_file,
 	.issue_yfs_rpc	= yfs_fs_remove_file,
 	.success	= afs_silly_unlink_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.edit_dir	= afs_silly_unlink_edit_dir,
 };
 
@@ -200,12 +200,30 @@ static int afs_do_silly_unlink(struct afs_vnode *dvnode, struct afs_vnode *vnode
 
 	afs_op_set_vnode(op, 0, dvnode);
 	afs_op_set_vnode(op, 1, vnode);
+	op->file[0].dv_delta = 1;
+	op->file[0].update_ctime = true;
+	op->file[1].op_unlinked = true;
+	op->file[1].update_ctime = true;
 
 	op->dentry	= dentry;
 	op->ops		= &afs_silly_unlink_operation;
 
 	trace_afs_silly_rename(vnode, true);
-	return afs_do_sync_operation(op);
+	afs_begin_vnode_operation(op);
+	afs_wait_for_operation(op);
+
+	/* If there was a conflict with a third party, check the status of the
+	 * unlinked vnode.
+	 */
+	if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+		op->file[1].update_ctime = false;
+		op->fetch_status.which = 1;
+		op->ops = &afs_fetch_status_operation;
+		afs_begin_vnode_operation(op);
+		afs_wait_for_operation(op);
+	}
+
+	return afs_put_operation(op);
 }
 
 /*

fs/afs/file.c

@@ -225,7 +225,6 @@ static void afs_fetch_data_success(struct afs_operation *op)
 	struct afs_vnode *vnode = op->file[0].vnode;
 
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, vnode);
 	afs_vnode_commit_status(op, &op->file[0]);
 	afs_stat_v(vnode, n_fetches);
 	atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes);
@@ -240,6 +239,7 @@ static const struct afs_operation_ops afs_fetch_data_operation = {
 	.issue_afs_rpc	= afs_fs_fetch_data,
 	.issue_yfs_rpc	= yfs_fs_fetch_data,
 	.success	= afs_fetch_data_success,
+	.aborted	= afs_check_for_remote_deletion,
 	.put		= afs_fetch_data_put,
 };
 

fs/afs/flock.c

@@ -175,10 +175,7 @@ static void afs_kill_lockers_enoent(struct afs_vnode *vnode)
 
 static void afs_lock_success(struct afs_operation *op)
 {
-	struct afs_vnode *vnode = op->file[0].vnode;
-
 	_enter("op=%08x", op->debug_id);
-	afs_check_for_remote_deletion(op, vnode);
 	afs_vnode_commit_status(op, &op->file[0]);
 }
 
@@ -186,6 +183,7 @@ static const struct afs_operation_ops afs_set_lock_operation = {
 	.issue_afs_rpc	= afs_fs_set_lock,
 	.issue_yfs_rpc	= yfs_fs_set_lock,
 	.success	= afs_lock_success,
+	.aborted	= afs_check_for_remote_deletion,
 };
 
 /*

fs/afs/fs_operation.c

@@ -187,9 +187,17 @@ void afs_wait_for_operation(struct afs_operation *op)
 		op->error = afs_wait_for_call_to_complete(op->call, &op->ac);
 	}
 
-	if (op->error == 0) {
+	switch (op->error) {
+	case 0:
 		_debug("success");
 		op->ops->success(op);
+		break;
+	case -ECONNABORTED:
+		if (op->ops->aborted)
+			op->ops->aborted(op);
+		break;
+	default:
+		break;
 	}
 
 	afs_end_vnode_operation(op);

fs/afs/inode.c

@@ -165,9 +165,11 @@ static void afs_apply_status(struct afs_operation *op,
 {
 	struct afs_file_status *status = &vp->scb.status;
 	struct afs_vnode *vnode = vp->vnode;
+	struct inode *inode = &vnode->vfs_inode;
 	struct timespec64 t;
 	umode_t mode;
 	bool data_changed = false;
+	bool change_size = vp->set_size;
 
 	_enter("{%llx:%llu.%u} %s",
 	       vp->fid.vid, vp->fid.vnode, vp->fid.unique,
@@ -186,25 +188,25 @@ static void afs_apply_status(struct afs_operation *op,
 	}
 
 	if (status->nlink != vnode->status.nlink)
-		set_nlink(&vnode->vfs_inode, status->nlink);
+		set_nlink(inode, status->nlink);
 
 	if (status->owner != vnode->status.owner)
-		vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
+		inode->i_uid = make_kuid(&init_user_ns, status->owner);
 
 	if (status->group != vnode->status.group)
-		vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
+		inode->i_gid = make_kgid(&init_user_ns, status->group);
 
 	if (status->mode != vnode->status.mode) {
-		mode = vnode->vfs_inode.i_mode;
+		mode = inode->i_mode;
 		mode &= ~S_IALLUGO;
 		mode |= status->mode;
-		WRITE_ONCE(vnode->vfs_inode.i_mode, mode);
+		WRITE_ONCE(inode->i_mode, mode);
 	}
 
 	t = status->mtime_client;
-	vnode->vfs_inode.i_ctime = t;
-	vnode->vfs_inode.i_mtime = t;
-	vnode->vfs_inode.i_atime = t;
+	inode->i_mtime = t;
+	if (vp->update_ctime)
+		inode->i_ctime = op->ctime;
 
 	if (vnode->status.data_version != status->data_version)
 		data_changed = true;
@@ -226,6 +228,7 @@ static void afs_apply_status(struct afs_operation *op,
 		} else {
 			set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
 		}
+		change_size = true;
 	} else if (vnode->status.type == AFS_FTYPE_DIR) {
 		/* Expected directory change is handled elsewhere so
 		 * that we can locally edit the directory and save on a
@@ -233,11 +236,22 @@ static void afs_apply_status(struct afs_operation *op,
 		 */
 		if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
 			data_changed = false;
+		change_size = true;
 	}
 
 	if (data_changed) {
-		inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
-		afs_set_i_size(vnode, status->size);
+		inode_set_iversion_raw(inode, status->data_version);
+
+		/* Only update the size if the data version jumped.  If the
+		 * file is being modified locally, then we might have our own
+		 * idea of what the size should be that's not the same as
+		 * what's on the server.
+		 */
+		if (change_size) {
+			afs_set_i_size(vnode, status->size);
+			inode->i_ctime = t;
+			inode->i_atime = t;
+		}
 	}
 }
 
@@ -267,32 +281,39 @@ void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *v
 
 	_enter("");
 
-	ASSERTCMP(op->error, ==, 0);
-
 	write_seqlock(&vnode->cb_lock);
 
 	if (vp->scb.have_error) {
+		/* A YFS server will return this from RemoveFile2 and AFS and
+		 * YFS will return this from InlineBulkStatus.
+		 */
 		if (vp->scb.status.abort_code == VNOVNODE) {
 			set_bit(AFS_VNODE_DELETED, &vnode->flags);
 			clear_nlink(&vnode->vfs_inode);
 			__afs_break_callback(vnode, afs_cb_break_for_deleted);
+			op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
 		}
-	} else {
-		if (vp->scb.have_status)
-			afs_apply_status(op, vp);
+	} else if (vp->scb.have_status) {
+		afs_apply_status(op, vp);
 		if (vp->scb.have_cb)
 			afs_apply_callback(op, vp);
+	} else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+		drop_nlink(&vnode->vfs_inode);
+		if (vnode->vfs_inode.i_nlink == 0) {
+			set_bit(AFS_VNODE_DELETED, &vnode->flags);
+			__afs_break_callback(vnode, afs_cb_break_for_deleted);
+		}
 	}
 
 	write_sequnlock(&vnode->cb_lock);
 
-	if (op->error == 0 && vp->scb.have_status)
+	if (vp->scb.have_status)
 		afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
 }
 
 static void afs_fetch_status_success(struct afs_operation *op)
 {
-	struct afs_vnode_param *vp = &op->file[0];
+	struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
 	struct afs_vnode *vnode = vp->vnode;
 	int ret;
 
@@ -306,10 +327,11 @@ static void afs_fetch_status_success(struct afs_operation *op)
 	}
 }
 
-static const struct afs_operation_ops afs_fetch_status_operation = {
+const struct afs_operation_ops afs_fetch_status_operation = {
 	.issue_afs_rpc	= afs_fs_fetch_status,
 	.issue_yfs_rpc	= yfs_fs_fetch_status,
 	.success	= afs_fetch_status_success,
+	.aborted	= afs_check_for_remote_deletion,
 };
 
 /*
@@ -716,6 +738,9 @@ int afs_getattr(const struct path *path, struct kstat *stat,
 	do {
 		read_seqbegin_or_lock(&vnode->cb_lock, &seq);
 		generic_fillattr(inode, stat);
+		if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
+		    stat->nlink > 0)
+			stat->nlink -= 1;
 	} while (need_seqretry(&vnode->cb_lock, seq));
 
 	done_seqretry(&vnode->cb_lock, seq);
@@ -785,7 +810,15 @@ void afs_evict_inode(struct inode *inode)
 
 static void afs_setattr_success(struct afs_operation *op)
 {
+	struct inode *inode = &op->file[0].vnode->vfs_inode;
+
 	afs_vnode_commit_status(op, &op->file[0]);
+	if (op->setattr.attr->ia_valid & ATTR_SIZE) {
+		loff_t i_size = inode->i_size, size = op->setattr.attr->ia_size;
+		if (size > i_size)
+			pagecache_isize_extended(inode, i_size, size);
+		truncate_pagecache(inode, size);
+	}
 }
 
 static const struct afs_operation_ops afs_setattr_operation = {
@@ -801,17 +834,31 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
 {
 	struct afs_operation *op;
 	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+	int ret;
 
 	_enter("{%llx:%llu},{n=%pd},%x",
 	       vnode->fid.vid, vnode->fid.vnode, dentry,
 	       attr->ia_valid);
 
 	if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
-				ATTR_MTIME))) {
+				ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
+				ATTR_TOUCH))) {
 		_leave(" = 0 [unsupported]");
 		return 0;
 	}
 
+	if (attr->ia_valid & ATTR_SIZE) {
+		if (!S_ISREG(vnode->vfs_inode.i_mode))
+			return -EISDIR;
+
+		ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
+		if (ret)
+			return ret;
+
+		if (attr->ia_size == i_size_read(&vnode->vfs_inode))
+			attr->ia_valid &= ~ATTR_SIZE;
+	}
+
 	/* flush any dirty data outstanding on a regular file */
 	if (S_ISREG(vnode->vfs_inode.i_mode))
 		filemap_write_and_wait(vnode->vfs_inode.i_mapping);
@@ -825,8 +872,12 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
 	afs_op_set_vnode(op, 0, vnode);
 	op->setattr.attr = attr;
 
-	if (attr->ia_valid & ATTR_SIZE)
+	if (attr->ia_valid & ATTR_SIZE) {
 		op->file[0].dv_delta = 1;
+		op->file[0].set_size = true;
+	}
+	op->ctime = attr->ia_ctime;
+	op->file[0].update_ctime = 1;
 
 	op->ops = &afs_setattr_operation;
 	return afs_do_sync_operation(op);

fs/afs/internal.h

@@ -634,6 +634,7 @@ struct afs_vnode {
 #define AFS_VNODE_AUTOCELL	6		/* set if Vnode is an auto mount point */
 #define AFS_VNODE_PSEUDODIR	7 		/* set if Vnode is a pseudo directory */
 #define AFS_VNODE_NEW_CONTENT	8		/* Set if file has new content (create/trunc-0) */
+#define AFS_VNODE_SILLY_DELETED	9		/* Set if file has been silly-deleted */
 
 	struct list_head	wb_keys;	/* List of keys available for writeback */
 	struct list_head	pending_locks;	/* locks waiting to be granted */
@@ -744,8 +745,11 @@ struct afs_vnode_param {
 	afs_dataversion_t	dv_before;	/* Data version before the call */
 	unsigned int		cb_break_before; /* cb_break + cb_s_break before the call */
 	u8			dv_delta;	/* Expected change in data version */
-	bool			put_vnode;	/* T if we have a ref on the vnode */
-	bool			need_io_lock;	/* T if we need the I/O lock on this */
+	bool			put_vnode:1;	/* T if we have a ref on the vnode */
+	bool			need_io_lock:1;	/* T if we need the I/O lock on this */
+	bool			update_ctime:1;	/* Need to update the ctime */
+	bool			set_size:1;	/* Must update i_size */
+	bool			op_unlinked:1;	/* True if file was unlinked by op */
 };
 
 /*
@@ -766,9 +770,9 @@ struct afs_operation {
 	struct dentry		*dentry;	/* Dentry to be altered */
 	struct dentry		*dentry_2;	/* Second dentry to be altered */
 	struct timespec64	mtime;		/* Modification time to record */
+	struct timespec64	ctime;		/* Change time to set */
 	short			nr_files;	/* Number of entries in file[], more_files */
 	short			error;
-	unsigned int		abort_code;
 	unsigned int		debug_id;
 
 	unsigned int		cb_v_break;	/* Volume break counter before op */
@@ -837,6 +841,7 @@ struct afs_operation {
 #define AFS_OPERATION_LOCK_1		0x0200	/* Set if have io_lock on file[1] */
 #define AFS_OPERATION_TRIED_ALL		0x0400	/* Set if we've tried all the fileservers */
 #define AFS_OPERATION_RETRY_SERVER	0x0800	/* Set if we should retry the current server */
+#define AFS_OPERATION_DIR_CONFLICT	0x1000	/* Set if we detected a 3rd-party dir change */
 };
 
 /*
@@ -932,6 +937,7 @@ extern const struct address_space_operations afs_dir_aops;
 extern const struct dentry_operations afs_fs_dentry_operations;
 
 extern void afs_d_release(struct dentry *);
+extern void afs_check_for_remote_deletion(struct afs_operation *);
 
 /*
  * dir_edit.c
@@ -1063,6 +1069,8 @@ extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
 /*
  * inode.c
  */
+extern const struct afs_operation_ops afs_fetch_status_operation;
+
 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
@@ -1435,7 +1443,6 @@ extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
 /*
  * yfsclient.c
  */
-extern void yfs_fs_fetch_file_status(struct afs_operation *);
 extern void yfs_fs_fetch_data(struct afs_operation *);
 extern void yfs_fs_create_file(struct afs_operation *);
 extern void yfs_fs_make_dir(struct afs_operation *);
@@ -1481,15 +1488,6 @@ static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 	return &vnode->vfs_inode;
 }
 
-static inline void afs_check_for_remote_deletion(struct afs_operation *op,
-						 struct afs_vnode *vnode)
-{
-	if (op->error == -ENOENT) {
-		set_bit(AFS_VNODE_DELETED, &vnode->flags);
-		afs_break_callback(vnode, afs_cb_break_for_deleted);
-	}
-}
-
 /*
  * Note that a dentry got changed.  We need to set d_fsdata to the data version
  * number derived from the result of the operation.  It doesn't matter if
@@ -1504,6 +1502,18 @@ static inline void afs_update_dentry_version(struct afs_operation *op,
 			(void *)(unsigned long)dir_vp->scb.status.data_version;
 }
 
+/*
+ * Check for a conflicting operation on a directory that we just unlinked from.
+ * If someone managed to sneak a link or an unlink in on the file we just
+ * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
+ */
+static inline void afs_check_dir_conflict(struct afs_operation *op,
+					  struct afs_vnode_param *dvp)
+{
+	if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
+		op->flags |= AFS_OPERATION_DIR_CONFLICT;
+}
+
 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
 {
 	trace_afs_io_error(call->debug_id, -EIO, where);

fs/afs/misc.c

@@ -83,6 +83,7 @@ int afs_abort_to_error(u32 abort_code)
 	case UAENOLCK:			return -ENOLCK;
 	case UAENOTEMPTY:		return -ENOTEMPTY;
 	case UAELOOP:			return -ELOOP;
+	case UAEOVERFLOW:		return -EOVERFLOW;
 	case UAENOMEDIUM:		return -ENOMEDIUM;
 	case UAEDQUOT:			return -EDQUOT;
 

fs/afs/write.c

@@ -194,11 +194,11 @@ int afs_write_end(struct file *file, struct address_space *mapping,
 
 	i_size = i_size_read(&vnode->vfs_inode);
 	if (maybe_i_size > i_size) {
-		spin_lock(&vnode->wb_lock);
+		write_seqlock(&vnode->cb_lock);
 		i_size = i_size_read(&vnode->vfs_inode);
 		if (maybe_i_size > i_size)
 			i_size_write(&vnode->vfs_inode, maybe_i_size);
-		spin_unlock(&vnode->wb_lock);
+		write_sequnlock(&vnode->cb_lock);
 	}
 
 	if (!PageUptodate(page)) {
@@ -393,6 +393,7 @@ static void afs_store_data_success(struct afs_operation *op)
 {
 	struct afs_vnode *vnode = op->file[0].vnode;
 
+	op->ctime = op->file[0].scb.status.mtime_client;
 	afs_vnode_commit_status(op, &op->file[0]);
 	if (op->error == 0) {
 		afs_pages_written_back(vnode, op->store.first, op->store.last);
@@ -491,6 +492,7 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
 	unsigned long count, priv;
 	unsigned n, offset, to, f, t;
 	pgoff_t start, first, last;
+	loff_t i_size, end;
 	int loop, ret;
 
 	_enter(",%lx", primary_page->index);
@@ -591,7 +593,12 @@ static int afs_write_back_from_locked_page(struct address_space *mapping,
 	first = primary_page->index;
 	last = first + count - 1;
 
+	end = (loff_t)last * PAGE_SIZE + to;
+	i_size = i_size_read(&vnode->vfs_inode);
+
 	_debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to);
+	if (end > i_size)
+		to = i_size & ~PAGE_MASK;
 
 	ret = afs_store_data(mapping, first, last, offset, to);
 	switch (ret) {
@@ -844,6 +851,7 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
 			     vmf->page->index, priv);
 	SetPagePrivate(vmf->page);
 	set_page_private(vmf->page, priv);
+	file_update_time(file);
 
 	sb_end_pagefault(inode->i_sb);
 	return VM_FAULT_LOCKED;

fs/afs/yfsclient.c

@@ -329,29 +329,6 @@ static void xdr_decode_YFSFetchVolumeStatus(const __be32 **_bp,
 	*_bp += sizeof(*x) / sizeof(__be32);
 }
 
-/*
- * Deliver a reply that's a status, callback and volsync.
- */
-static int yfs_deliver_fs_status_cb_and_volsync(struct afs_call *call)
-{
-	struct afs_operation *op = call->op;
-	const __be32 *bp;
-	int ret;
-
-	ret = afs_transfer_reply(call);
-	if (ret < 0)
-		return ret;
-
-	/* unmarshall the reply once we've received all of it */
-	bp = call->buffer;
-	xdr_decode_YFSFetchStatus(&bp, call, &op->file[0].scb);
-	xdr_decode_YFSCallBack(&bp, call, &op->file[0].scb);
-	xdr_decode_YFSVolSync(&bp, &op->volsync);
-
-	_leave(" = 0 [done]");
-	return 0;
-}
-
 /*
  * Deliver reply data to operations that just return a file status and a volume
  * sync record.
@@ -374,48 +351,6 @@ static int yfs_deliver_status_and_volsync(struct afs_call *call)
 	return 0;
 }
 
-/*
- * YFS.FetchStatus operation type
- */
-static const struct afs_call_type yfs_RXYFSFetchStatus_vnode = {
-	.name		= "YFS.FetchStatus(vnode)",
-	.op		= yfs_FS_FetchStatus,
-	.deliver	= yfs_deliver_fs_status_cb_and_volsync,
-	.destructor	= afs_flat_call_destructor,
-};
-
-/*
- * Fetch the status information for a file.
- */
-void yfs_fs_fetch_file_status(struct afs_operation *op)
-{
-	struct afs_vnode_param *vp = &op->file[0];
-	struct afs_call *call;
-	__be32 *bp;
-
-	_enter(",%x,{%llx:%llu},,",
-	       key_serial(op->key), vp->fid.vid, vp->fid.vnode);
-
-	call = afs_alloc_flat_call(op->net, &yfs_RXYFSFetchStatus_vnode,
-				   sizeof(__be32) * 2 +
-				   sizeof(struct yfs_xdr_YFSFid),
-				   sizeof(struct yfs_xdr_YFSFetchStatus) +
-				   sizeof(struct yfs_xdr_YFSCallBack) +
-				   sizeof(struct yfs_xdr_YFSVolSync));
-	if (!call)
-		return afs_op_nomem(op);
-
-	/* marshall the parameters */
-	bp = call->request;
-	bp = xdr_encode_u32(bp, YFSFETCHSTATUS);
-	bp = xdr_encode_u32(bp, 0); /* RPC flags */
-	bp = xdr_encode_YFSFid(bp, &vp->fid);
-	yfs_check_req(call, bp);
-
-	trace_afs_make_fs_call(call, &vp->fid);
-	afs_make_op_call(op, call, GFP_NOFS);
-}
-
 /*
  * Deliver reply data to an YFS.FetchData64.
  */
@@ -1604,13 +1539,37 @@ void yfs_fs_release_lock(struct afs_operation *op)
 	afs_make_op_call(op, call, GFP_NOFS);
 }
 
+/*
+ * Deliver a reply to YFS.FetchStatus
+ */
+static int yfs_deliver_fs_fetch_status(struct afs_call *call)
+{
+	struct afs_operation *op = call->op;
+	struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
+	const __be32 *bp;
+	int ret;
+
+	ret = afs_transfer_reply(call);
+	if (ret < 0)
+		return ret;
+
+	/* unmarshall the reply once we've received all of it */
+	bp = call->buffer;
+	xdr_decode_YFSFetchStatus(&bp, call, &vp->scb);
+	xdr_decode_YFSCallBack(&bp, call, &vp->scb);
+	xdr_decode_YFSVolSync(&bp, &op->volsync);
+
+	_leave(" = 0 [done]");
+	return 0;
+}
+
 /*
  * YFS.FetchStatus operation type
  */
 static const struct afs_call_type yfs_RXYFSFetchStatus = {
 	.name		= "YFS.FetchStatus",
 	.op		= yfs_FS_FetchStatus,
-	.deliver	= yfs_deliver_fs_status_cb_and_volsync,
+	.deliver	= yfs_deliver_fs_fetch_status,
 	.destructor	= afs_flat_call_destructor,
 };
 
@@ -1619,7 +1578,7 @@ static const struct afs_call_type yfs_RXYFSFetchStatus = {
  */
 void yfs_fs_fetch_status(struct afs_operation *op)
 {
-	struct afs_vnode_param *vp = &op->file[0];
+	struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
 	struct afs_call *call;
 	__be32 *bp;