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);
}
