[PATCH v3 1/1] ceph: add getvxattr op

[Milind Changire <milindchangire@gmail.com>]

Problem:
Directory vxattrs like ceph.dir.pin* and ceph.dir.layout* may not be
propagated to the client as frequently to keep them updated. This
creates vxattr availability problems.

Solution:
Adds new getvxattr op to fetch ceph.dir.pin*, ceph.dir.layout* and
ceph.file.layout* vxattrs.
If the entire layout for a dir or a file is being set, then it is
expected that the layout be set in standard JSON format. Individual
field value retrieval is not wrapped in JSON. The JSON format also
applies while setting the vxattr if the entire layout is being set in
one go.
As a temporary measure, setting a vxattr can also be done in the old
format. The old format will be deprecated in the future.

URL: https://tracker.ceph.com/issues/51062
Signed-off-by: Milind Changire <mchangir@redhat.com>
---
 fs/ceph/inode.c              | 51 ++++++++++++++++++++++++++++++++++++
 fs/ceph/mds_client.c         | 27 ++++++++++++++++++-
 fs/ceph/mds_client.h         | 12 ++++++++-
 fs/ceph/strings.c            |  1 +
 fs/ceph/super.h              |  1 +
 fs/ceph/xattr.c              | 34 ++++++++++++++++++++++++
 include/linux/ceph/ceph_fs.h |  1 +
 7 files changed, 125 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index e3322fcb2e8d..b63746a7a0e0 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2291,6 +2291,57 @@ int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
 	return err;
 }
 
+int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
+		      size_t size)
+{
+	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
+	struct ceph_mds_client *mdsc = fsc->mdsc;
+	struct ceph_mds_request *req;
+	int mode = USE_AUTH_MDS;
+	int err;
+	char *xattr_value;
+	size_t xattr_value_len;
+
+	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
+	if (IS_ERR(req)) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	req->r_path2 = kstrdup(name, GFP_NOFS);
+	if (!req->r_path2) {
+		err = -ENOMEM;
+		goto put;
+	}
+
+	ihold(inode);
+	req->r_inode = inode;
+	err = ceph_mdsc_do_request(mdsc, NULL, req);
+	if (err < 0)
+		goto put;
+
+	xattr_value = req->r_reply_info.xattr_info.xattr_value;
+	xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
+
+	dout("do_getvxattr xattr_value_len:%u, size:%u\n", xattr_value_len, size);
+
+	err = xattr_value_len;
+	if (size == 0)
+		goto put;
+
+	if (xattr_value_len > size) {
+		err = -ERANGE;
+		goto put;
+	}
+
+	memcpy(value, xattr_value, xattr_value_len);
+put:
+	ceph_mdsc_put_request(req);
+out:
+	dout("do_getvxattr result=%d\n", err);
+	return err;
+}
+
 
 /*
  * Check inode permissions.  We verify we have a valid value for
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index c30eefc0ac19..a5eafc71d976 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -555,6 +555,29 @@ static int parse_reply_info_create(void **p, void *end,
 	return -EIO;
 }
 
+static int parse_reply_info_getvxattr(void **p, void *end,
+				      struct ceph_mds_reply_info_parsed *info,
+				      u64 features)
+{
+	u8 struct_v, struct_compat;
+	u32 struct_len;
+	u32 value_len;
+
+	ceph_decode_8_safe(p, end, struct_v, bad);
+	ceph_decode_8_safe(p, end, struct_compat, bad);
+	ceph_decode_32_safe(p, end, struct_len, bad);
+	ceph_decode_32_safe(p, end, value_len, bad);
+
+	if (value_len == end - *p) {
+	  info->xattr_info.xattr_value = *p;
+	  info->xattr_info.xattr_value_len = end - *p;
+	  *p = end;
+	  return info->xattr_info.xattr_value_len;
+	}
+bad:
+	return -EIO;
+}
+
 /*
  * parse extra results
  */
@@ -570,6 +593,8 @@ static int parse_reply_info_extra(void **p, void *end,
 		return parse_reply_info_readdir(p, end, info, features);
 	else if (op == CEPH_MDS_OP_CREATE)
 		return parse_reply_info_create(p, end, info, features, s);
+	else if (op == CEPH_MDS_OP_GETVXATTR)
+		return parse_reply_info_getvxattr(p, end, info, features);
 	else
 		return -EIO;
 }
@@ -615,7 +640,7 @@ static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
 
 	if (p != end)
 		goto bad;
-	return 0;
+	return err;
 
 bad:
 	err = -EIO;
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 97c7f7bfa55f..f2a8e5af3c2e 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -29,8 +29,10 @@ enum ceph_feature_type {
 	CEPHFS_FEATURE_MULTI_RECONNECT,
 	CEPHFS_FEATURE_DELEG_INO,
 	CEPHFS_FEATURE_METRIC_COLLECT,
+	CEPHFS_FEATURE_ALTERNATE_NAME,
+	CEPHFS_FEATURE_GETVXATTR,
 
-	CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_METRIC_COLLECT,
+	CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_GETVXATTR,
 };
 
 /*
@@ -45,6 +47,8 @@ enum ceph_feature_type {
 	CEPHFS_FEATURE_MULTI_RECONNECT,		\
 	CEPHFS_FEATURE_DELEG_INO,		\
 	CEPHFS_FEATURE_METRIC_COLLECT,		\
+	CEPHFS_FEATURE_ALTERNATE_NAME,		\
+	CEPHFS_FEATURE_GETVXATTR,		\
 						\
 	CEPHFS_FEATURE_MAX,			\
 }
@@ -100,6 +104,11 @@ struct ceph_mds_reply_dir_entry {
 	loff_t			      offset;
 };
 
+struct ceph_mds_reply_xattr {
+	char *xattr_value;
+	size_t xattr_value_len;
+};
+
 /*
  * parsed info about an mds reply, including information about
  * either: 1) the target inode and/or its parent directory and dentry,
@@ -115,6 +124,7 @@ struct ceph_mds_reply_info_parsed {
 	char                          *dname;
 	u32                           dname_len;
 	struct ceph_mds_reply_lease   *dlease;
+	struct ceph_mds_reply_xattr   xattr_info;
 
 	/* extra */
 	union {
diff --git a/fs/ceph/strings.c b/fs/ceph/strings.c
index 573bb9556fb5..e36e8948e728 100644
--- a/fs/ceph/strings.c
+++ b/fs/ceph/strings.c
@@ -60,6 +60,7 @@ const char *ceph_mds_op_name(int op)
 	case CEPH_MDS_OP_LOOKUPINO:  return "lookupino";
 	case CEPH_MDS_OP_LOOKUPNAME:  return "lookupname";
 	case CEPH_MDS_OP_GETATTR:  return "getattr";
+	case CEPH_MDS_OP_GETVXATTR:  return "getvxattr";
 	case CEPH_MDS_OP_SETXATTR: return "setxattr";
 	case CEPH_MDS_OP_SETATTR: return "setattr";
 	case CEPH_MDS_OP_RMXATTR: return "rmxattr";
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index ac331aa07cfa..a627fa69668e 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1043,6 +1043,7 @@ static inline bool ceph_inode_is_shutdown(struct inode *inode)
 
 /* xattr.c */
 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
+int ceph_do_getvxattr(struct inode *inode, const char *name, void *value, size_t size);
 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 extern struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci);
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index fcf7dfdecf96..dc32876a541a 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -918,6 +918,30 @@ static inline int __get_request_mask(struct inode *in) {
 	return mask;
 }
 
+/* check if the entire cluster supports the given feature */
+static inline bool ceph_cluster_has_feature(struct inode *inode, int feature_bit)
+{
+	int64_t i;
+	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+	struct ceph_mds_session **sessions = fsc->mdsc->sessions;
+	int64_t num_sessions = atomic_read(&fsc->mdsc->num_sessions);
+
+	if (fsc->mdsc->stopping)
+		return false;
+
+	if (!sessions)
+		return false;
+
+	for (i = 0; i < num_sessions; i++) {
+		struct ceph_mds_session *session = sessions[i];
+		if (!session)
+			return false;
+		if (!test_bit(feature_bit, &session->s_features))
+			return false;
+	}
+	return true;
+}
+
 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
 		      size_t size)
 {
@@ -927,6 +951,16 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
 	int req_mask;
 	ssize_t err;
 
+	if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) &&
+	    ceph_cluster_has_feature(inode, CEPHFS_FEATURE_GETVXATTR)) {
+		err = ceph_do_getvxattr(inode, name, value, size);
+		/* if cluster doesn't support xattr, we try to service it
+		 * locally
+		 */
+		if (err >= 0)
+			return err;
+	}
+
 	/* let's see if a virtual xattr was requested */
 	vxattr = ceph_match_vxattr(inode, name);
 	if (vxattr) {
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 7ad6c3d0db7d..66db21ac5f0c 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -328,6 +328,7 @@ enum {
 	CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
 	CEPH_MDS_OP_LOOKUPINO  = 0x00104,
 	CEPH_MDS_OP_LOOKUPNAME = 0x00105,
+	CEPH_MDS_OP_GETVXATTR  = 0x00106,
 
 	CEPH_MDS_OP_SETXATTR   = 0x01105,
 	CEPH_MDS_OP_RMXATTR    = 0x01106,
-- 
2.31.1