+++ /dev/null
-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2011, 2013, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/lvfs/lvfs_linux.c
- *
- * Author: Andreas Dilger <adilger@clusterfs.com>
- */
-
-#define DEBUG_SUBSYSTEM S_FILTER
-
-#include <linux/version.h>
-#include <linux/fs.h>
-#include <asm/unistd.h>
-#include <linux/slab.h>
-#include <linux/pagemap.h>
-#include <linux/quotaops.h>
-#include <linux/version.h>
-#include <libcfs/libcfs.h>
-#include <obd.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/lustre_compat25.h>
-#include <lvfs.h>
-
-#include <obd.h>
-#include <lustre_lib.h>
-
-struct lprocfs_stats *obd_memory = NULL;
-EXPORT_SYMBOL(obd_memory);
-/* refine later and change to seqlock or simlar from libcfs */
-
-/* Debugging check only needed during development */
-#ifdef OBD_CTXT_DEBUG
-# define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
-# define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
- msg)
-# define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
-#else
-# define ASSERT_CTXT_MAGIC(magic) do {} while(0)
-# define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
-# define ASSERT_KERNEL_CTXT(msg) do {} while(0)
-#endif
-
-static void push_group_info(struct lvfs_run_ctxt *save,
- struct group_info *ginfo)
-{
- if (!ginfo) {
- save->ngroups = current_ngroups;
- current_ngroups = 0;
- } else {
- struct cred *cred;
- task_lock(current);
- save->group_info = current_cred()->group_info;
- if ((cred = prepare_creds())) {
- cred->group_info = ginfo;
- commit_creds(cred);
- }
- task_unlock(current);
- }
-}
-
-static void pop_group_info(struct lvfs_run_ctxt *save,
- struct group_info *ginfo)
-{
- if (!ginfo) {
- current_ngroups = save->ngroups;
- } else {
- struct cred *cred;
- task_lock(current);
- if ((cred = prepare_creds())) {
- cred->group_info = save->group_info;
- commit_creds(cred);
- }
- task_unlock(current);
- }
-}
-
-/* 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_refcount(current->fs->pwd.dentry));
- LASSERT(d_refcount(new_ctx->pwd));
- save->pwd = dget(current->fs->pwd.dentry);
- save->pwdmnt = mntget(current->fs->pwd.mnt);
- 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();
-
- 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);
-}
-EXPORT_SYMBOL(push_ctxt);
-
-void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
- struct lvfs_ucred *uc)
-{
- /* if there is underlaying dt_device then pop_ctxt is not needed */
- if (new_ctx->dt != NULL)
- return;
-
- ASSERT_CTXT_MAGIC(saved->magic);
- ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
-
- LASSERTF(current->fs->pwd.dentry == new_ctx->pwd, "%p != %p\n",
- current->fs->pwd.dentry, new_ctx->pwd);
- LASSERTF(current->fs->pwd.mnt == new_ctx->pwdmnt, "%p != %p\n",
- current->fs->pwd.mnt, 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);
- }
-}
-EXPORT_SYMBOL(pop_ctxt);
-
-/* utility to rename a file */
-int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
- char *oldname, char *newname)
-{
- struct dentry *dchild_old, *dchild_new;
- int err = 0;
- ENTRY;
-
- ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
- CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
- (int)strlen(oldname), oldname, (int)strlen(newname), newname);
-
- dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
- if (IS_ERR(dchild_old))
- RETURN(PTR_ERR(dchild_old));
-
- if (!dchild_old->d_inode)
- GOTO(put_old, err = -ENOENT);
-
- dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
- if (IS_ERR(dchild_new))
- GOTO(put_old, err = PTR_ERR(dchild_new));
-
- err = vfs_rename(dir->d_inode, dchild_old, dir->d_inode, dchild_new);
-
- dput(dchild_new);
-put_old:
- dput(dchild_old);
- RETURN(err);
-}
-EXPORT_SYMBOL(lustre_rename);
-
-/* Note: dput(dchild) will *not* be called if there is an error */
-struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
- int flags)
-{
- struct path path = {
- .dentry = de,
- .mnt = ctxt->pwdmnt,
- };
- return ll_dentry_open(&path, flags, current_cred());
-}
-EXPORT_SYMBOL(l_dentry_open);
-
-#ifdef LPROCFS
-__s64 lprocfs_read_helper(struct lprocfs_counter *lc,
- struct lprocfs_counter_header *header,
- enum lprocfs_stats_flags flags,
- enum lprocfs_fields_flags field)
-{
- __s64 ret = 0;
-
- if (lc == NULL || header == NULL)
- RETURN(0);
-
- switch (field) {
- case LPROCFS_FIELDS_FLAGS_CONFIG:
- ret = header->lc_config;
- break;
- case LPROCFS_FIELDS_FLAGS_SUM:
- ret = lc->lc_sum;
- if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
- ret += lc->lc_sum_irq;
- break;
- case LPROCFS_FIELDS_FLAGS_MIN:
- ret = lc->lc_min;
- break;
- case LPROCFS_FIELDS_FLAGS_MAX:
- ret = lc->lc_max;
- break;
- case LPROCFS_FIELDS_FLAGS_AVG:
- ret = (lc->lc_max - lc->lc_min) / 2;
- break;
- case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
- ret = lc->lc_sumsquare;
- break;
- case LPROCFS_FIELDS_FLAGS_COUNT:
- ret = lc->lc_count;
- break;
- default:
- break;
- };
-
- RETURN(ret);
-}
-EXPORT_SYMBOL(lprocfs_read_helper);
-#endif /* LPROCFS */
-
-MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
-MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
-MODULE_LICENSE("GPL");
git://git.whamcloud.com / fs / lustre-release.git / blobdiff