[RFC PATCH v1.1] nfs: Add support for the birth time attribute

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nfsd already support btime by:
commit e377a3e698fb ("nfsd: Add support for the birth time attribute")

This patch enable nfs to report btime in nfs_getattr.
If underlying filesystem supports "btime" timestamp,
statx will report btime for STATX_BTIME.

Signed-off-by: Chen Hanxiao <chenhx.fnst@xxxxxxxxxxx>

---
1.1:
	minor fix

 fs/nfs/inode.c          | 14 +++++++++++++-
 fs/nfs/nfs4proc.c       |  3 +++
 fs/nfs/nfs4xdr.c        | 23 +++++++++++++++++++++++
 include/linux/nfs_fs.h  |  2 ++
 include/linux/nfs_xdr.h |  2 ++
 5 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 8172dd4135a1..36e322b993f8 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -835,6 +835,7 @@ int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_inode *nfsi = NFS_I(inode);
 	unsigned long cache_validity;
 	int err = 0;
 	bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
@@ -845,7 +846,7 @@ int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
 
 	request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
 			STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
-			STATX_INO | STATX_SIZE | STATX_BLOCKS |
+			STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
 			STATX_CHANGE_COOKIE;
 
 	if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
@@ -911,6 +912,10 @@ int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
 out_no_revalidate:
 	/* Only return attributes that were revalidated. */
 	stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
+	if (nfsi->btime.tv_sec == 0 && nfsi->btime.tv_nsec == 0)
+		stat->result_mask &= ~STATX_BTIME;
+	else
+		stat->btime = nfsi->btime;
 
 	generic_fillattr(&nop_mnt_idmap, inode, stat);
 	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
@@ -2189,6 +2194,12 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 		nfsi->cache_validity |=
 			save_cache_validity & NFS_INO_INVALID_MTIME;
 
+	if (fattr->valid & NFS_ATTR_FATTR_BTIME) {
+		nfsi->btime = fattr->btime;
+	} else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
+		nfsi->cache_validity |=
+			save_cache_validity & NFS_INO_INVALID_BTIME;
+
 	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 		inode->i_ctime = fattr->ctime;
 	else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
@@ -2332,6 +2343,7 @@ struct inode *nfs_alloc_inode(struct super_block *sb)
 #endif /* CONFIG_NFS_V4 */
 #ifdef CONFIG_NFS_V4_2
 	nfsi->xattr_cache = NULL;
+	memset(&nfsi->btime, 0, sizeof(nfsi->btime));
 #endif
 	nfs_netfs_inode_init(nfsi);
 
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index e1a886b58354..c4717ae4b1b3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -211,6 +211,7 @@ const u32 nfs4_fattr_bitmap[3] = {
 	| FATTR4_WORD1_TIME_ACCESS
 	| FATTR4_WORD1_TIME_METADATA
 	| FATTR4_WORD1_TIME_MODIFY
+	| FATTR4_WORD1_TIME_CREATE
 	| FATTR4_WORD1_MOUNTED_ON_FILEID,
 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 	FATTR4_WORD2_SECURITY_LABEL
@@ -3909,6 +3910,8 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
 			server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
 			server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_CREATE))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_BTIME;
 		memcpy(server->attr_bitmask_nl, res.attr_bitmask,
 				sizeof(server->attr_bitmask));
 		server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index deec76cf5afe..df3699eb29e8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4171,6 +4171,24 @@ static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, str
 	return status;
 }
 
+static int decode_attr_time_create(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
+{
+	int status = 0;
+
+	time->tv_sec = 0;
+	time->tv_nsec = 0;
+	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_CREATE - 1U)))
+		return -EIO;
+	if (likely(bitmap[1] & FATTR4_WORD1_TIME_CREATE)) {
+		status = decode_attr_time(xdr, time);
+		if (status == 0)
+			status = NFS_ATTR_FATTR_BTIME;
+		bitmap[1] &= ~FATTR4_WORD1_TIME_CREATE;
+	}
+	dprintk("%s: btime=%lld\n", __func__, time->tv_sec);
+	return status;
+}
+
 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
 {
 	int status = 0;
@@ -4730,6 +4748,11 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
 		goto xdr_error;
 	fattr->valid |= status;
 
+	status = decode_attr_time_create(xdr, bitmap, &fattr->btime);
+	if (status < 0)
+		goto xdr_error;
+	fattr->valid |= status;
+
 	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
 	if (status < 0)
 		goto xdr_error;
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 279262057a92..ba8c1872494d 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -159,6 +159,7 @@ struct nfs_inode {
 	unsigned long		read_cache_jiffies;
 	unsigned long		attrtimeo;
 	unsigned long		attrtimeo_timestamp;
+	struct timespec64       btime;
 
 	unsigned long		attr_gencount;
 
@@ -298,6 +299,7 @@ struct nfs4_copy_state {
 #define NFS_INO_INVALID_XATTR	BIT(15)		/* xattrs are invalid */
 #define NFS_INO_INVALID_NLINK	BIT(16)		/* cached nlinks is invalid */
 #define NFS_INO_INVALID_MODE	BIT(17)		/* cached mode is invalid */
+#define NFS_INO_INVALID_BTIME	BIT(18)		/* cached btime is invalid */
 
 #define NFS_INO_INVALID_ATTR	(NFS_INO_INVALID_CHANGE \
 		| NFS_INO_INVALID_CTIME \
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 12bbb5c63664..8e90c5bbf5e4 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -67,6 +67,7 @@ struct nfs_fattr {
 	struct timespec64	atime;
 	struct timespec64	mtime;
 	struct timespec64	ctime;
+	struct timespec64	btime;
 	__u64			change_attr;	/* NFSv4 change attribute */
 	__u64			pre_change_attr;/* pre-op NFSv4 change attribute */
 	__u64			pre_size;	/* pre_op_attr.size	  */
@@ -106,6 +107,7 @@ struct nfs_fattr {
 #define NFS_ATTR_FATTR_OWNER_NAME	(1U << 23)
 #define NFS_ATTR_FATTR_GROUP_NAME	(1U << 24)
 #define NFS_ATTR_FATTR_V4_SECURITY_LABEL (1U << 25)
+#define NFS_ATTR_FATTR_BTIME		(1U << 26)
 
 #define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
 		| NFS_ATTR_FATTR_MODE \
-- 
2.39.1




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