Commit 04a87e34 authored May 12, 2017 by Yonghong Song Committed by David Sterba Jun 19, 2017

Btrfs: add statx support



Return enhanced file attributes from the btrfs, including:
  (1). inode creation time as stx_btime, and
  (2). Certain BTRFS_INODE_xxx flags are mapped to stx_attributes flags.

Example output:
	[root@localhost ~]# cat t.sh
	touch t
	chattr +aic t
	~/linux/samples/statx/test-statx t
	chattr -aic t
	touch t
	echo "========================================"
	~/linux/samples/statx/test-statx t
	/bin/rm t
	[root@localhost ~]# ./t.sh
	statx(t) = 0
	results=fff
  	  Size: 0               Blocks: 0          IO Block: 4096    regular file
	Device: 00:1c           Inode: 63962       Links: 1
	Access: (0644/-rw-r--r--)  Uid:     0   Gid:     0
	Access: 2017-05-11 16:03:13.999856591-0700
	Modify: 2017-05-11 16:03:13.999856591-0700
	Change: 2017-05-11 16:03:14.000856663-0700
 	 Birth: 2017-05-11 16:03:13.999856591-0700
	Attributes: 0000000000000034 (........ ........ ........ ........ ........ ........ ........ .-ai.c..)
	========================================
	statx(t) = 0
	results=fff
	  Size: 0               Blocks: 0          IO Block: 4096    regular file
	Device: 00:1c           Inode: 63962       Links: 1
	Access: (0644/-rw-r--r--)  Uid:     0   Gid:     0
	Access: 2017-05-11 16:03:14.006857097-0700
	Modify: 2017-05-11 16:03:14.006857097-0700
	Change: 2017-05-11 16:03:14.006857097-0700
 	Birth: 2017-05-11 16:03:13.999856591-0700
	Attributes: 0000000000000000 (........ ........ ........ ........ ........ ........ ........ .---.-..)
	[root@localhost ~]#

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 036b0217

fs/btrfs/inode.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -9563,6 +9563,24 @@ static int btrfs_getattr(const struct path path, struct kstat stat,
		u64 delalloc_bytes;
		struct inode *inode = d_inode(path->dentry);
		u32 blocksize = inode->i_sb->s_blocksize;
		u32 bi_flags = BTRFS_I(inode)->flags;

		stat->result_mask \|= STATX_BTIME;
		stat->btime.tv_sec = BTRFS_I(inode)->i_otime.tv_sec;
		stat->btime.tv_nsec = BTRFS_I(inode)->i_otime.tv_nsec;
		if (bi_flags & BTRFS_INODE_APPEND)
		stat->attributes \|= STATX_ATTR_APPEND;
		if (bi_flags & BTRFS_INODE_COMPRESS)
		stat->attributes \|= STATX_ATTR_COMPRESSED;
		if (bi_flags & BTRFS_INODE_IMMUTABLE)
		stat->attributes \|= STATX_ATTR_IMMUTABLE;
		if (bi_flags & BTRFS_INODE_NODUMP)
		stat->attributes \|= STATX_ATTR_NODUMP;

		stat->attributes_mask \|= (STATX_ATTR_APPEND \|
		STATX_ATTR_COMPRESSED \|
		STATX_ATTR_IMMUTABLE \|
		STATX_ATTR_NODUMP);

		generic_fillattr(inode, stat);
		stat->dev = BTRFS_I(inode)->root->anon_dev;

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