[PATCH 05/12] statx: Ext4: Return enhanced file attributes

[David Howells <dhowells@redhat.com>]

Return enhanced file attributes from the Ext4 filesystem.  This includes
the following:

 (1) The inode creation time (i_crtime) as i_btime, setting STATX_BTIME.

 (2) The inode i_version as st_version if a file with I_VERSION set or a
     directory, setting STATX_VERSION.

 (3) FS_xxx_FL flags are returned as for ioctl(FS_IOC_GETFLAGS), setting
     STATX_IOC_FLAGS.

This requires that all ext4 inodes have a getattr call, not just some of
them, so to this end, split the ext4_getattr() function and only call part
of it where appropriate.

Example output:

	[root@andromeda ~]# ./samples/statx/test-statx /usr
	statx(/usr) = 0
	results=37ef
	  Size: 4096            Blocks: 16         IO Block: 4096    directory
	Device: 08:02           Inode: 1572865     Links: 14
	Access: (0755/drwxr-xr-x)  Uid:     0   Gid:     0
	Access: 2015-11-03 16:12:30.000000000+0000
	Modify: 2013-10-18 15:29:18.000000000+0100
	Change: 2013-10-18 15:29:18.000000000+0100
	Data version: 2fh
	Inode flags: 00000000 (-------- -------- -------- --------)
	IO-blocksize: blksize=4096

Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/ext4/ext4.h    |    2 ++
 fs/ext4/file.c    |    2 +-
 fs/ext4/inode.c   |   31 ++++++++++++++++++++++++++++---
 fs/ext4/namei.c   |    2 ++
 fs/ext4/symlink.c |    2 ++
 5 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 31efcd78bf51..606f94ba455c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2302,6 +2302,8 @@ extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
 				struct kstat *stat);
 extern void ext4_evict_inode(struct inode *);
 extern void ext4_clear_inode(struct inode *);
+extern int  ext4_file_getattr(struct vfsmount *mnt, struct dentry *dentry,
+			      struct kstat *stat);
 extern int  ext4_sync_inode(handle_t *, struct inode *);
 extern void ext4_dirty_inode(struct inode *, int);
 extern int ext4_change_inode_journal_flag(struct inode *, int);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 113837e7ba98..3b6fe04b199e 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -712,7 +712,7 @@ const struct file_operations ext4_file_operations = {
 
 const struct inode_operations ext4_file_inode_operations = {
 	.setattr	= ext4_setattr,
-	.getattr	= ext4_getattr,
+	.getattr	= ext4_file_getattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
 	.listxattr	= ext4_listxattr,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 612fbcf76b5c..c86ff971d8bc 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4818,11 +4818,36 @@ err_out:
 int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
 		 struct kstat *stat)
 {
-	struct inode *inode;
-	unsigned long long delalloc_blocks;
+	struct inode *inode = d_inode(dentry);
+	struct ext4_inode *raw_inode;
+	struct ext4_inode_info *ei = EXT4_I(inode);
+
+	if (EXT4_FITS_IN_INODE(raw_inode, ei, i_crtime)) {
+		stat->result_mask |= STATX_BTIME;
+		stat->btime.tv_sec = ei->i_crtime.tv_sec;
+		stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
+	}
+
+	if (S_ISDIR(inode->i_mode) || IS_I_VERSION(inode)) {
+		stat->result_mask |= STATX_VERSION;
+		stat->version = inode->i_version;
+	}
+
+	ext4_get_inode_flags(ei);
+	stat->ioc_flags |= ei->i_flags & EXT4_FL_USER_VISIBLE;
+	stat->result_mask |= STATX_IOC_FLAGS;
 
-	inode = d_inode(dentry);
 	generic_fillattr(inode, stat);
+	return 0;
+}
+
+int ext4_file_getattr(struct vfsmount *mnt, struct dentry *dentry,
+		      struct kstat *stat)
+{
+	struct inode *inode = dentry->d_inode;
+	u64 delalloc_blocks;
+
+	ext4_getattr(mnt, dentry, stat);
 
 	/*
 	 * If there is inline data in the inode, the inode will normally not
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 9f61e7679a6d..1f18e61c4f8a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3848,6 +3848,7 @@ const struct inode_operations ext4_dir_inode_operations = {
 	.tmpfile	= ext4_tmpfile,
 	.rename2	= ext4_rename2,
 	.setattr	= ext4_setattr,
+	.getattr	= ext4_getattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
 	.listxattr	= ext4_listxattr,
@@ -3859,6 +3860,7 @@ const struct inode_operations ext4_dir_inode_operations = {
 
 const struct inode_operations ext4_special_inode_operations = {
 	.setattr	= ext4_setattr,
+	.getattr	= ext4_getattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
 	.listxattr	= ext4_listxattr,
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index c677f2c1044b..89c9d27c6319 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -106,6 +106,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
 	.follow_link	= page_follow_link_light,
 	.put_link	= page_put_link,
 	.setattr	= ext4_setattr,
+	.getattr	= ext4_getattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
 	.listxattr	= ext4_listxattr,
@@ -116,6 +117,7 @@ const struct inode_operations ext4_fast_symlink_inode_operations = {
 	.readlink	= generic_readlink,
 	.follow_link    = simple_follow_link,
 	.setattr	= ext4_setattr,
+	.getattr	= ext4_getattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
 	.listxattr	= ext4_listxattr,