#include #include #include #include #include "super.h" #include "mds_client.h" /* * Basic fh */ struct ceph_nfs_fh { u64 ino; } __attribute__ ((packed)); /* * Larger fh that includes parent ino. */ struct ceph_nfs_confh { u64 ino, parent_ino; } __attribute__ ((packed)); static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len, struct inode *parent_inode) { int type; struct ceph_nfs_fh *fh = (void *)rawfh; struct ceph_nfs_confh *cfh = (void *)rawfh; int connected_handle_length = sizeof(*cfh)/4; int handle_length = sizeof(*fh)/4; /* don't re-export snaps */ if (ceph_snap(inode) != CEPH_NOSNAP) return -EINVAL; if (parent_inode && (*max_len < connected_handle_length)) { *max_len = connected_handle_length; return FILEID_INVALID; } else if (*max_len < handle_length) { *max_len = handle_length; return FILEID_INVALID; } if (parent_inode) { dout("encode_fh %llx with parent %llx\n", ceph_ino(inode), ceph_ino(parent_inode)); cfh->ino = ceph_ino(inode); cfh->parent_ino = ceph_ino(parent_inode); *max_len = connected_handle_length; type = FILEID_INO32_GEN_PARENT; } else { dout("encode_fh %llx\n", ceph_ino(inode)); fh->ino = ceph_ino(inode); *max_len = handle_length; type = FILEID_INO32_GEN; } return type; } static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino) { struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; struct inode *inode; struct ceph_vino vino; int err; vino.ino = ino; vino.snap = CEPH_NOSNAP; inode = ceph_find_inode(sb, vino); if (!inode) { struct ceph_mds_request *req; int mask; req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO, USE_ANY_MDS); if (IS_ERR(req)) return ERR_CAST(req); mask = CEPH_STAT_CAP_INODE; if (ceph_security_xattr_wanted(d_inode(sb->s_root))) mask |= CEPH_CAP_XATTR_SHARED; req->r_args.getattr.mask = cpu_to_le32(mask); req->r_ino1 = vino; req->r_num_caps = 1; err = ceph_mdsc_do_request(mdsc, NULL, req); inode = req->r_target_inode; if (inode) ihold(inode); ceph_mdsc_put_request(req); if (!inode) return ERR_PTR(-ESTALE); } return d_obtain_alias(inode); } /* * convert regular fh to dentry */ static struct dentry *ceph_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { struct ceph_nfs_fh *fh = (void *)fid->raw; if (fh_type != FILEID_INO32_GEN && fh_type != FILEID_INO32_GEN_PARENT) return NULL; if (fh_len < sizeof(*fh) / 4) return NULL; dout("fh_to_dentry %llx\n", fh->ino); return __fh_to_dentry(sb, fh->ino); } static struct dentry *__get_parent(struct super_block *sb, struct dentry *child, u64 ino) { struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc; struct ceph_mds_request *req; struct inode *inode; int mask; int err; req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPPARENT, USE_ANY_MDS); if (IS_ERR(req)) return ERR_CAST(req); if (child) { req->r_inode = d_inode(child); ihold(d_inode(child)); } else { req->r_ino1 = (struct ceph_vino) { .ino = ino, .snap = CEPH_NOSNAP, }; } mask = CEPH_STAT_CAP_INODE; if (ceph_security_xattr_wanted(d_inode(sb->s_root))) mask |= CEPH_CAP_XATTR_SHARED; req->r_args.getattr.mask = cpu_to_le32(mask); req->r_num_caps = 1; err = ceph_mdsc_do_request(mdsc, NULL, req); inode = req->r_target_inode; if (inode) ihold(inode); ceph_mdsc_put_request(req); if (!inode) return ERR_PTR(-ENOENT); return d_obtain_alias(inode); } static struct dentry *ceph_get_parent(struct dentry *child) { /* don't re-export snaps */ if (ceph_snap(d_inode(child)) != CEPH_NOSNAP) return ERR_PTR(-EINVAL); dout("get_parent %p ino %llx.%llx\n", child, ceph_vinop(d_inode(child))); return __get_parent(child->d_sb, child, 0); } /* * convert regular fh to parent */ static struct dentry *ceph_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { struct ceph_nfs_confh *cfh = (void *)fid->raw; struct dentry *dentry; if (fh_type != FILEID_INO32_GEN_PARENT) return NULL; if (fh_len < sizeof(*cfh) / 4) return NULL; dout("fh_to_parent %llx\n", cfh->parent_ino); dentry = __get_parent(sb, NULL, cfh->ino); if (unlikely(dentry == ERR_PTR(-ENOENT))) dentry = __fh_to_dentry(sb, cfh->parent_ino); return dentry; } static int ceph_get_name(struct dentry *parent, char *name, struct dentry *child) { struct ceph_mds_client *mdsc; struct ceph_mds_request *req; int err; mdsc = ceph_inode_to_client(d_inode(child))->mdsc; req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPNAME, USE_ANY_MDS); if (IS_ERR(req)) return PTR_ERR(req); inode_lock(d_inode(parent)); req->r_inode = d_inode(child); ihold(d_inode(child)); req->r_ino2 = ceph_vino(d_inode(parent)); req->r_locked_dir = d_inode(parent); req->r_num_caps = 2; err = ceph_mdsc_do_request(mdsc, NULL, req); inode_unlock(d_inode(parent)); if (!err) { struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; memcpy(name, rinfo->dname, rinfo->dname_len); name[rinfo->dname_len] = 0; dout("get_name %p ino %llx.%llx name %s\n", child, ceph_vinop(d_inode(child)), name); } else { dout("get_name %p ino %llx.%llx err %d\n", child, ceph_vinop(d_inode(child)), err); } ceph_mdsc_put_request(req); return err; } const struct export_operations ceph_export_ops = { .encode_fh = ceph_encode_fh, .fh_to_dentry = ceph_fh_to_dentry, .fh_to_parent = ceph_fh_to_parent, .get_parent = ceph_get_parent, .get_name = ceph_get_name, }; the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools')