On Tue, 2022-01-11 at 15:14 +0530, Milind Changire wrote: > 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@xxxxxxxxxx> > --- > 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 | 65 > ++++++++++++++++++++++++++++++++++++ > include/linux/ceph/ceph_fs.h | 1 + > 7 files changed, 156 insertions(+), 2 deletions(-) > > diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c > index e3322fcb2e8d..f29d59b63c52 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:%lu, size:%lu\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..fdde8ffa71bb 100644 > --- a/fs/ceph/xattr.c > +++ b/fs/ceph/xattr.c > @@ -918,6 +918,64 @@ static inline int __get_request_mask(struct inode > *in) { > return mask; > } > > +static inline bool ceph_is_passthrough_vxattr(const char *name) > +{ > + const char *vxattr_list[] = { > + "ceph.dir.pin", > + "ceph.dir.pin.random", > + "ceph.dir.pin.distributed", > + "ceph.dir.layout", > + "ceph.dir.layout.object_size", > + "ceph.dir.layout.stripe_count", > + "ceph.dir.layout.stripe_unit", > + "ceph.dir.layout.pool", > + "ceph.dir.layout.pool_name", > + "ceph.dir.layout.pool_id", > + "ceph.dir.layout.pool_namespace", > + "ceph.file.layout", > + "ceph.file.layout.object_size", > + "ceph.file.layout.stripe_count", > + "ceph.file.layout.stripe_unit", > + "ceph.file.layout.pool", > + "ceph.file.layout.pool_name", > + "ceph.file.layout.pool_id", > + "ceph.file.layout.pool_namespace", > + }; > + int i = 0; > + int n = sizeof(vxattr_list)/sizeof(vxattr_list[0]); > + > + while (i < n) { > + if (!strcmp(name, vxattr_list[i])) > + return true; > + i++; > + } > + return false; > +} > + > +/* 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 +985,13 @@ ssize_t __ceph_getxattr(struct inode *inode, > const char *name, void *value, > int req_mask; > ssize_t err; > > + if (ceph_is_passthrough_vxattr(name) && > + ceph_cluster_has_feature(inode, CEPHFS_FEATURE_GETVXATTR)) { > + err = ceph_do_getvxattr(inode, name, value, size); > + return err; > + } > + dout("vxattr is not passthrough or kclient doesn't support > GETVXATTR\n"); > + > /* 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, Thanks Milind, but this patch is unfortunately mangled and can't be applied as-is. The guide to sending usable kernel patches is here: https://www.kernel.org/doc/html/latest/process/submitting-patches.html In particular, you generally want to use git-format-patch to generate the patch and then use git-send-email to send it. Try sending it to yourself first and ensure it looks correct. Thanks, -- Jeff Layton <jlayton@xxxxxxxxxx>
