[RFC v2 62/83] File: getattr and file inode operations

Andiry Xu
2018-03-10T18:29:24Z

fs/nova/Makefile | 2 +-
fs/nova/file.c | 31 +++++++++++++++++++++++++++++++
fs/nova/inode.c | 25 +++++++++++++++++++++++++
fs/nova/inode.h | 2 ++
fs/nova/nova.h | 3 +++
5 files changed, 62 insertions(+), 1 deletion(-)
create mode 100644 fs/nova/file.c

diff --git a/fs/nova/Makefile b/fs/nova/Makefile
index eb97e46..468ed6f 100644
--- a/fs/nova/Makefile
+++ b/fs/nova/Makefile
@@ -4,5 +4,5 @@

obj-$(CONFIG_NOVA_FS) += nova.o

-nova-y := balloc.o bbuild.o dir.o inode.o journal.o log.o namei.o\
+nova-y := balloc.o bbuild.o dir.o file.o inode.o journal.o log.o namei.o\
rebuild.o stats.o super.o
diff --git a/fs/nova/file.c b/fs/nova/file.c
new file mode 100644
index 0000000..b46d4bd
--- /dev/null
+++ b/fs/nova/file.c
@@ -0,0 +1,31 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * File operations for files.
+ *
+ * Copyright 2015-2016 Regents of the University of California,
+ * UCSD Non-Volatile Systems Lab, Andiry Xu <jix024@cs.ucsd.edu>
+ * Copyright 2012-2013 Intel Corporation
+ * Copyright 2009-2011 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/slab.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+#include <linux/falloc.h>
+#include <asm/mman.h>
+#include "nova.h"
+#include "inode.h"
+
+
+const struct inode_operations nova_file_inode_operations = {
+ .setattr = nova_notify_change,
+ .getattr = nova_getattr,
+ .get_acl = NULL,
+};
diff --git a/fs/nova/inode.c b/fs/nova/inode.c
index 0e9ab4b..6fcc5e7 100644
--- a/fs/nova/inode.c
+++ b/fs/nova/inode.c
@@ -231,6 +231,7 @@ static int nova_read_inode(struct super_block *sb, struct inode *inode,

switch (inode->i_mode & S_IFMT) {
case S_IFREG:
+ inode->i_op = &nova_file_inode_operations;
break;
case S_IFDIR:
inode->i_op = &nova_dir_inode_operations;
@@ -926,6 +927,7 @@ struct inode *nova_new_vfs_inode(enum nova_new_inode_type type,

switch (type) {
case TYPE_CREATE:
+ inode->i_op = &nova_file_inode_operations;
inode->i_mapping->a_ops = &nova_aops_dax;
break;
case TYPE_MKNOD:
@@ -1089,6 +1091,29 @@ static void nova_setsize(struct inode *inode, loff_t oldsize, loff_t newsize,
NOVA_END_TIMING(setsize_t, setsize_time);
}

+int nova_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ struct inode *inode = d_inode(path->dentry);
+ struct nova_inode_info *si = NOVA_I(inode);
+ struct nova_inode_info_header *sih = &si->header;
+ unsigned int flags = sih->i_flags;
+
+ if (flags & FS_APPEND_FL)
+ stat->attributes |= STATX_ATTR_APPEND;
+ if (flags & FS_COMPR_FL)
+ stat->attributes |= STATX_ATTR_COMPRESSED;
+ if (flags & FS_IMMUTABLE_FL)
+ stat->attributes |= STATX_ATTR_IMMUTABLE;
+ if (flags & FS_NODUMP_FL)
+ stat->attributes |= STATX_ATTR_NODUMP;
+
+ generic_fillattr(inode, stat);
+ /* stat->blocks should be the number of 512B blocks */
+ stat->blocks = (inode->i_blocks << inode->i_sb->s_blocksize_bits) >> 9;
+ return 0;
+}
+
int nova_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
diff --git a/fs/nova/inode.h b/fs/nova/inode.h
index 4ddf8c2..48403cf 100644
--- a/fs/nova/inode.h
+++ b/fs/nova/inode.h
@@ -267,6 +267,8 @@ int nova_delete_file_tree(struct super_block *sb,
extern void nova_evict_inode(struct inode *inode);
extern int nova_write_inode(struct inode *inode, struct writeback_control *wbc);
extern void nova_dirty_inode(struct inode *inode, int flags);
+extern int nova_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags);
extern int nova_notify_change(struct dentry *dentry, struct iattr *attr);

#endif
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index 85292d3..601e082 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -484,6 +484,9 @@ int nova_add_dentry(struct dentry *dentry, u64 ino, int inc_link,
int nova_remove_dentry(struct dentry *dentry, int dec_link,
struct nova_inode_update *update, u64 epoch_id);

+/* file.c */
+extern const struct inode_operations nova_file_inode_operations;
+
/* namei.c */
extern const struct inode_operations nova_dir_inode_operations;
extern const struct inode_operations nova_special_inode_operations;
--
2.7.4