void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx, struct lvfs_ucred *uc) { ASSERT_CTXT_MAGIC(saved->magic); ASSERT_KERNEL_CTXT("popping non-kernel context!\n"); LASSERTF(cfs_fs_pwd(current->fs) == new_ctx->pwd, "%p != %p\n", cfs_fs_pwd(current->fs), new_ctx->pwd); LASSERTF(cfs_fs_mnt(current->fs) == new_ctx->pwdmnt, "%p != %p\n", cfs_fs_mnt(current->fs), new_ctx->pwdmnt); set_fs(saved->fs); ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd); dput(saved->pwd); mntput(saved->pwdmnt); current->fs->umask = saved->luc.luc_umask; if (uc) { struct cred *cred; if ((cred = prepare_creds())) { cred->uid = saved->luc.luc_uid; cred->gid = saved->luc.luc_gid; cred->fsuid = saved->luc.luc_fsuid; cred->fsgid = saved->luc.luc_fsgid; cred->cap_effective = saved->luc.luc_cap; commit_creds(cred); } pop_group_info(saved, uc->luc_ginfo ?: uc->luc_identity ? uc->luc_identity->mi_ginfo : NULL); } }
int mgs_fs_setup(struct obd_device *obd, struct vfsmount *mnt) { struct mgs_obd *mgs = &obd->u.mgs; struct lvfs_run_ctxt saved; struct dentry *dentry; int rc; ENTRY; /* FIXME what's this? Do I need it? */ rc = cfs_cleanup_group_info(); if (rc) RETURN(rc); mgs->mgs_vfsmnt = mnt; mgs->mgs_sb = mnt->mnt_root->d_inode->i_sb; rc = fsfilt_setup(obd, mgs->mgs_sb); if (rc) RETURN(rc); OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt); obd->obd_lvfs_ctxt.pwdmnt = mnt; obd->obd_lvfs_ctxt.pwd = mnt->mnt_root; obd->obd_lvfs_ctxt.fs = get_ds(); obd->obd_lvfs_ctxt.cb_ops = mgs_lvfs_ops; push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); /* Setup the configs dir */ dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MOUNT_CONFIGS_DIR, 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create %s directory: rc = %d\n", MOUNT_CONFIGS_DIR, rc); GOTO(err_pop, rc); } mgs->mgs_configs_dir = dentry; /* create directory to store nid table versions */ dentry = simple_mkdir(cfs_fs_pwd(current->fs), mnt, MGS_NIDTBL_DIR, 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create %s directory: rc = %d\n", MOUNT_CONFIGS_DIR, rc); GOTO(err_pop, rc); } else { dput(dentry); } err_pop: pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); return rc; }
/* push / pop to root of obd store */ void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx, struct lvfs_ucred *uc) { /* if there is underlaying dt_device then push_ctxt is not needed */ if (new_ctx->dt != NULL) return; /* ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n"); */ ASSERT_CTXT_MAGIC(new_ctx->magic); OBD_SET_CTXT_MAGIC(save); save->fs = get_fs(); LASSERT(d_count(cfs_fs_pwd(current->fs))); LASSERT(d_count(new_ctx->pwd)); save->pwd = dget(cfs_fs_pwd(current->fs)); save->pwdmnt = mntget(cfs_fs_mnt(current->fs)); save->luc.luc_umask = current_umask(); save->ngroups = current_cred()->group_info->ngroups; LASSERT(save->pwd); LASSERT(save->pwdmnt); LASSERT(new_ctx->pwd); LASSERT(new_ctx->pwdmnt); if (uc) { struct cred *cred; save->luc.luc_uid = current_uid(); save->luc.luc_gid = current_gid(); save->luc.luc_fsuid = current_fsuid(); save->luc.luc_fsgid = current_fsgid(); save->luc.luc_cap = current_cap(); cred = prepare_creds(); if (cred) { cred->uid = uc->luc_uid; cred->gid = uc->luc_gid; cred->fsuid = uc->luc_fsuid; cred->fsgid = uc->luc_fsgid; cred->cap_effective = uc->luc_cap; commit_creds(cred); } push_group_info(save, uc->luc_ginfo ?: uc->luc_identity ? uc->luc_identity->mi_ginfo : NULL); } current->fs->umask = 0; /* umask already applied on client */ set_fs(new_ctx->fs); ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd); }
/* push / pop to root of obd store */ void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx, struct lvfs_ucred *uc) { //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n"); ASSERT_CTXT_MAGIC(new_ctx->magic); OBD_SET_CTXT_MAGIC(save); save->fs = get_fs(); LASSERT(cfs_atomic_read(&cfs_fs_pwd(current->fs)->d_count)); LASSERT(cfs_atomic_read(&new_ctx->pwd->d_count)); save->pwd = dget(cfs_fs_pwd(current->fs)); save->pwdmnt = mntget(cfs_fs_mnt(current->fs)); save->luc.luc_umask = cfs_curproc_umask(); save->ngroups = current_cred()->group_info->ngroups; LASSERT(save->pwd); LASSERT(save->pwdmnt); LASSERT(new_ctx->pwd); LASSERT(new_ctx->pwdmnt); if (uc) { struct cred *cred; save->luc.luc_uid = current_uid(); save->luc.luc_gid = current_gid(); save->luc.luc_fsuid = current_fsuid(); save->luc.luc_fsgid = current_fsgid(); save->luc.luc_cap = current_cap(); if ((cred = prepare_creds())) { cred->uid = uc->luc_uid; cred->gid = uc->luc_gid; cred->fsuid = uc->luc_fsuid; cred->fsgid = uc->luc_fsgid; cred->cap_effective = uc->luc_cap; commit_creds(cred); } push_group_info(save, uc->luc_ginfo ?: uc->luc_identity ? uc->luc_identity->mi_ginfo : NULL); } current->fs->umask = 0; /* umask already applied on client */ set_fs(new_ctx->fs); ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd); }