/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * mds/mds_fs.c
- * Lustre Metadata Server (MDS) filesystem interface code
+ * GPL HEADER START
*
- * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
- * Author: Andreas Dilger <adilger@clusterfs.com>
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License 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).
*
- * Lustre 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 for more details.
+ * 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
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/mds/mds_fs.c
+ *
+ * Lustre Metadata Server (MDS) filesystem interface code
+ *
+ * Author: Andreas Dilger <adilger@clusterfs.com>
*/
-#define EXPORT_SYMTAB
#define DEBUG_SUBSYSTEM S_MDS
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/version.h>
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
+#include <linux/sched.h>
#include <linux/mount.h>
-#endif
-#include <linux/lustre_mds.h>
-#include <linux/obd_class.h>
-#include <linux/obd_support.h>
-#include <linux/lustre_lib.h>
-#include <linux/lustre_fsfilt.h>
-
-/* This limit is arbitrary, but for now we fit it in 1 page (32k clients) */
-#define MDS_MAX_CLIENTS (PAGE_SIZE * 8)
-#define MDS_MAX_CLIENT_WORDS (MDS_MAX_CLIENTS / sizeof(unsigned long))
-
-static unsigned long last_rcvd_slots[MDS_MAX_CLIENT_WORDS];
-
-#define LAST_RCVD "last_rcvd"
-
-/* Add client data to the MDS. We use a bitmap to locate a free space
- * in the last_rcvd file if cl_off is -1 (i.e. a new client).
- * Otherwise, we have just read the data from the last_rcvd file and
- * we know its offset.
- */
-int mds_client_add(struct mds_obd *mds, struct mds_export_data *med, int cl_off)
+#include <lustre_mds.h>
+#include <obd_class.h>
+#include <obd_support.h>
+#include <lustre_lib.h>
+#include <lustre_fsfilt.h>
+#include <lustre_disk.h>
+#include <libcfs/list.h>
+
+#include "mds_internal.h"
+
+
+/* Creates an object with the same name as its fid. Because this is not at all
+ * performance sensitive, it is accomplished by creating a file, checking the
+ * fid, and renaming it. */
+int mds_obd_create(struct obd_export *exp, struct obdo *oa,
+ struct lov_stripe_md **ea, struct obd_trans_info *oti)
{
- int new_client = (cl_off == -1);
-
- /* the bitmap operations can handle cl_off > sizeof(long) * 8, so
- * there's no need for extra complication here
- */
- if (new_client) {
- cl_off = find_first_zero_bit(last_rcvd_slots, MDS_MAX_CLIENTS);
- repeat:
- if (cl_off >= MDS_MAX_CLIENTS) {
- CERROR("no room for clients - fix MDS_MAX_CLIENTS\n");
- return -ENOMEM;
- }
- if (test_and_set_bit(cl_off, last_rcvd_slots)) {
- CERROR("MDS client %d: found bit is set in bitmap\n",
- cl_off);
- cl_off = find_next_zero_bit(last_rcvd_slots,
- MDS_MAX_CLIENTS, cl_off);
- goto repeat;
- }
- } else {
- if (test_and_set_bit(cl_off, last_rcvd_slots)) {
- CERROR("MDS client %d: bit already set in bitmap!!\n",
- cl_off);
- LBUG();
- }
- }
-
- CDEBUG(D_INFO, "client at offset %d with UUID '%s' added\n",
- cl_off, med->med_mcd->mcd_uuid);
-
- med->med_off = cl_off;
-
- if (new_client) {
- struct obd_run_ctxt saved;
- loff_t off = MDS_LR_CLIENT + (cl_off * MDS_LR_SIZE);
- ssize_t written;
-
- push_ctxt(&saved, &mds->mds_ctxt, NULL);
- written = lustre_fwrite(mds->mds_rcvd_filp,
- (char *)med->med_mcd,
- sizeof(*med->med_mcd), &off);
- pop_ctxt(&saved, &mds->mds_ctxt, NULL);
-
- if (written != sizeof(*med->med_mcd)) {
- if (written < 0)
- RETURN(written);
- RETURN(-EIO);
- }
- CDEBUG(D_INFO, "wrote client mcd at off %u (len %u)\n",
- MDS_LR_CLIENT + (cl_off * MDS_LR_SIZE),
- (unsigned int)sizeof(*med->med_mcd));
- }
- return 0;
-}
-
-int mds_client_free(struct obd_export *exp)
-{
- struct mds_export_data *med = &exp->exp_mds_data;
struct mds_obd *mds = &exp->exp_obd->u.mds;
- struct mds_client_data zero_mcd;
- struct obd_run_ctxt saved;
- int written;
- loff_t off;
-
- if (!med->med_mcd)
- RETURN(0);
-
- off = MDS_LR_CLIENT + (med->med_off * MDS_LR_SIZE);
-
- CDEBUG(D_INFO, "freeing client at offset %u (%lld)with UUID '%s'\n",
- med->med_off, off, med->med_mcd->mcd_uuid);
-
- if (!test_and_clear_bit(med->med_off, last_rcvd_slots)) {
- CERROR("MDS client %u: bit already clear in bitmap!!\n",
- med->med_off);
- LBUG();
- }
-
- memset(&zero_mcd, 0, sizeof zero_mcd);
- push_ctxt(&saved, &mds->mds_ctxt, NULL);
- written = lustre_fwrite(mds->mds_rcvd_filp, (const char *)&zero_mcd,
- sizeof(zero_mcd), &off);
- pop_ctxt(&saved, &mds->mds_ctxt, NULL);
-
- if (written != sizeof(zero_mcd)) {
- CERROR("error zeroing out client %s off %d in %s: %d\n",
- med->med_mcd->mcd_uuid, med->med_off, LAST_RCVD,
- written);
- } else {
- CDEBUG(D_INFO, "zeroed out disconnecting client %s at off %d\n",
- med->med_mcd->mcd_uuid, med->med_off);
- }
-
- OBD_FREE(med->med_mcd, sizeof(*med->med_mcd));
-
- return 0;
-}
-
-static int mds_server_free_data(struct mds_obd *mds)
-{
- OBD_FREE(mds->mds_server_data, sizeof(*mds->mds_server_data));
- mds->mds_server_data = NULL;
-
- return 0;
-}
-
-static int mds_read_last_rcvd(struct obd_device *obddev, struct file *f)
-{
- struct mds_obd *mds = &obddev->u.mds;
- struct mds_server_data *msd;
- struct mds_client_data *mcd = NULL;
- loff_t off = 0;
- int cl_off;
- unsigned long last_rcvd_size = f->f_dentry->d_inode->i_size;
- __u64 last_transno = 0;
- __u64 last_mount;
- int rc = 0;
+ struct inode *parent_inode = mds->mds_objects_dir->d_inode;
+ unsigned int tmpname = ll_rand();
+ struct file *filp;
+ struct dentry *new_child;
+ struct lvfs_run_ctxt saved;
+ char fidname[LL_FID_NAMELEN];
+ void *handle;
+ struct lvfs_ucred ucred = { 0 };
+ int rc = 0, err, namelen;
+ ENTRY;
- OBD_ALLOC(msd, sizeof(*msd));
- if (!msd)
- RETURN(-ENOMEM);
- rc = lustre_fread(f, (char *)msd, sizeof(*msd), &off);
+ /* the owner of object file should always be root */
+ cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
- mds->mds_server_data = msd;
- if (rc == 0) {
- CERROR("empty MDS %s, new MDS?\n", LAST_RCVD);
+ if (strncmp(exp->exp_obd->obd_name, MDD_OBD_NAME,
+ strlen(MDD_OBD_NAME))) {
RETURN(0);
}
- if (rc != sizeof(*msd)) {
- CERROR("error reading MDS %s: rc = %d\n", LAST_RCVD, rc);
- if (rc > 0)
- rc = -EIO;
- GOTO(err_msd, rc);
- }
-
- CDEBUG(D_INODE, "last_rcvd has size %lu (msd + %lu clients)\n",
- last_rcvd_size, (last_rcvd_size - MDS_LR_CLIENT)/MDS_LR_SIZE);
-
- /*
- * When we do a clean MDS shutdown, we save the last_transno into
- * the header.
- */
- last_transno = le64_to_cpu(msd->msd_last_transno);
- mds->mds_last_transno = last_transno;
- CDEBUG(D_INODE, "got "LPU64" for server last_rcvd value\n",
- last_transno);
-
- last_mount = le64_to_cpu(msd->msd_mount_count);
- mds->mds_mount_count = last_mount;
- CDEBUG(D_INODE, "got "LPU64" for server last_mount value\n",last_mount);
-
- /* off is adjusted by lustre_fread, so we don't adjust it in the loop */
- for (off = MDS_LR_CLIENT, cl_off = 0; off < last_rcvd_size; cl_off++) {
- int mount_age;
-
- if (!mcd) {
- OBD_ALLOC(mcd, sizeof(*mcd));
- if (!mcd)
- GOTO(err_msd, rc = -ENOMEM);
- }
-
- rc = lustre_fread(f, (char *)mcd, sizeof(*mcd), &off);
- if (rc != sizeof(*mcd)) {
- CERROR("error reading MDS %s offset %d: rc = %d\n",
- LAST_RCVD, cl_off, rc);
- if (rc > 0) /* XXX fatal error or just abort reading? */
- rc = -EIO;
- break;
- }
-
- if (mcd->mcd_uuid[0] == '\0') {
- CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
- cl_off);
- continue;
- }
-
- last_transno = le64_to_cpu(mcd->mcd_last_transno);
-
- /* These exports are cleaned up by mds_disconnect(), so they
- * need to be set up like real exports as mds_connect() does.
- */
- mount_age = last_mount - le64_to_cpu(mcd->mcd_mount_count);
- if (mount_age < MDS_MOUNT_RECOV) {
- struct obd_export *exp = class_new_export(obddev);
- struct mds_export_data *med;
-
- if (!exp) {
- rc = -ENOMEM;
- break;
- }
-
- memcpy(&exp->exp_client_uuid.uuid, mcd->mcd_uuid,
- sizeof exp->exp_client_uuid.uuid);
- med = &exp->exp_mds_data;
- med->med_mcd = mcd;
- mds_client_add(mds, med, cl_off);
- /* create helper if export init gets more complex */
- INIT_LIST_HEAD(&med->med_open_head);
- spin_lock_init(&med->med_open_lock);
+ push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
- mcd = NULL;
- obddev->obd_recoverable_clients++;
- } else {
- CDEBUG(D_INFO,
- "discarded client %d, UUID '%s', count %Ld\n",
- cl_off, mcd->mcd_uuid,
- (long long)le64_to_cpu(mcd->mcd_mount_count));
+ sprintf(fidname, "OBJECTS/%u.%u", tmpname, current->pid);
+ filp = filp_open(fidname, O_CREAT | O_EXCL, 0666);
+ if (IS_ERR(filp)) {
+ rc = PTR_ERR(filp);
+ if (rc == -EEXIST) {
+ CERROR("impossible object name collision %u\n",
+ tmpname);
+ LBUG();
}
-
- CDEBUG(D_OTHER, "client at offset %d has last_rcvd = %Lu\n",
- cl_off, (unsigned long long)last_transno);
-
- if (last_transno > mds->mds_last_transno)
- mds->mds_last_transno = last_transno;
- }
-
- obddev->obd_last_committed = mds->mds_last_transno;
- if (obddev->obd_recoverable_clients) {
- CERROR("RECOVERY: %d recoverable clients, last_transno "
- LPU64"\n",
- obddev->obd_recoverable_clients, mds->mds_last_transno);
- obddev->obd_next_recovery_transno = obddev->obd_last_committed
- + 1;
- obddev->obd_flags |= OBD_RECOVERING;
+ CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
+ GOTO(out_pop, rc);
}
- if (mcd)
- OBD_FREE(mcd, sizeof(*mcd));
+ LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent);
- return 0;
+ oa->o_id = filp->f_dentry->d_inode->i_ino;
+ oa->o_generation = filp->f_dentry->d_inode->i_generation;
+ namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
-err_msd:
- mds_server_free_data(mds);
- return rc;
-}
-
-static int mds_fs_prep(struct obd_device *obddev)
-{
- struct mds_obd *mds = &obddev->u.mds;
- struct obd_run_ctxt saved;
- struct dentry *dentry;
- struct file *f;
- int rc;
+ LOCK_INODE_MUTEX_PARENT(parent_inode);
+ new_child = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
- push_ctxt(&saved, &mds->mds_ctxt, NULL);
- dentry = simple_mkdir(current->fs->pwd, "ROOT", 0755);
- if (IS_ERR(dentry)) {
- rc = PTR_ERR(dentry);
- CERROR("cannot create ROOT directory: rc = %d\n", rc);
- GOTO(err_pop, rc);
+ if (IS_ERR(new_child)) {
+ CERROR("getting neg dentry for obj rename: %d\n", rc);
+ GOTO(out_close, rc = PTR_ERR(new_child));
}
-
- mds->mds_rootfid.id = dentry->d_inode->i_ino;
- mds->mds_rootfid.generation = dentry->d_inode->i_generation;
- mds->mds_rootfid.f_type = S_IFDIR;
-
- dput(dentry);
-
- dentry = simple_mkdir(current->fs->pwd, "FH", 0700);
- if (IS_ERR(dentry)) {
- rc = PTR_ERR(dentry);
- CERROR("cannot create FH directory: rc = %d\n", rc);
- GOTO(err_pop, rc);
- }
- /* XXX probably want to hold on to this later... */
- dput(dentry);
-
- f = filp_open(LAST_RCVD, O_RDWR | O_CREAT, 0644);
- if (IS_ERR(f)) {
- rc = PTR_ERR(f);
- CERROR("cannot open/create %s file: rc = %d\n", LAST_RCVD, rc);
- GOTO(err_pop, rc = PTR_ERR(f));
- }
- if (!S_ISREG(f->f_dentry->d_inode->i_mode)) {
- CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
- f->f_dentry->d_inode->i_mode);
- GOTO(err_filp, rc = -ENOENT);
- }
-
- rc = fsfilt_journal_data(obddev, f);
- if (rc) {
- CERROR("cannot journal data on %s: rc = %d\n", LAST_RCVD, rc);
- GOTO(err_filp, rc);
+ if (new_child->d_inode != NULL) {
+ CERROR("impossible non-negative obj dentry " LPU64":%u!\n",
+ oa->o_id, oa->o_generation);
+ LBUG();
}
- rc = mds_read_last_rcvd(obddev, f);
- if (rc) {
- CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
- GOTO(err_client, rc);
+ handle = fsfilt_start(exp->exp_obd, mds->mds_objects_dir->d_inode,
+ FSFILT_OP_RENAME, NULL);
+ if (IS_ERR(handle))
+ GOTO(out_dput, rc = PTR_ERR(handle));
+
+ lock_kernel();
+ rc = ll_vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry,
+ filp->f_vfsmnt, mds->mds_objects_dir->d_inode,
+ new_child, filp->f_vfsmnt);
+ unlock_kernel();
+ if (rc)
+ CERROR("error renaming new object "LPU64":%u: rc %d\n",
+ oa->o_id, oa->o_generation, rc);
+
+ err = fsfilt_commit(exp->exp_obd, mds->mds_objects_dir->d_inode,
+ handle, 0);
+ if (!err) {
+ oa->o_gr = mdt_to_obd_objgrp(mds->mds_id);
+ oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLGROUP;
+ } else if (!rc)
+ rc = err;
+out_dput:
+ dput(new_child);
+out_close:
+ UNLOCK_INODE_MUTEX(parent_inode);
+ err = filp_close(filp, 0);
+ if (err) {
+ CERROR("closing tmpfile %u: rc %d\n", tmpname, rc);
+ if (!rc)
+ rc = err;
}
- mds->mds_rcvd_filp = f;
-err_pop:
- pop_ctxt(&saved, &mds->mds_ctxt, NULL);
-
- return rc;
-
-err_client:
- class_disconnect_all(obddev);
-err_filp:
- if (filp_close(f, 0))
- CERROR("can't close %s after error\n", LAST_RCVD);
- goto err_pop;
+out_pop:
+ pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, &ucred);
+ RETURN(rc);
}
-int mds_fs_setup(struct obd_device *obddev, struct vfsmount *mnt)
+int mds_obd_destroy(struct obd_export *exp, struct obdo *oa,
+ struct lov_stripe_md *ea, struct obd_trans_info *oti,
+ struct obd_export *md_exp, void *capa)
{
- struct mds_obd *mds = &obddev->u.mds;
+ struct mds_obd *mds = &exp->exp_obd->u.mds;
+ struct inode *parent_inode = mds->mds_objects_dir->d_inode;
+ struct obd_device *obd = exp->exp_obd;
+ struct lvfs_run_ctxt saved;
+ struct lvfs_ucred ucred = { 0 };
+ char fidname[LL_FID_NAMELEN];
+ struct inode *inode = NULL;
+ struct dentry *de;
+ void *handle;
+ int err, namelen, rc = 0;
ENTRY;
- mds->mds_vfsmnt = mnt;
-
- OBD_SET_CTXT_MAGIC(&mds->mds_ctxt);
- mds->mds_ctxt.pwdmnt = mnt;
- mds->mds_ctxt.pwd = mnt->mnt_root;
- mds->mds_ctxt.fs = get_ds();
+ cap_raise(ucred.luc_cap, CAP_SYS_RESOURCE);
+ push_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);
- RETURN(mds_fs_prep(obddev));
-}
+ namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation);
-int mds_fs_cleanup(struct obd_device *obddev)
-{
- struct mds_obd *mds = &obddev->u.mds;
- struct obd_run_ctxt saved;
- int rc = 0;
-
- class_disconnect_all(obddev); /* this cleans up client info too */
- mds_server_free_data(mds);
-
- push_ctxt(&saved, &mds->mds_ctxt, NULL);
- if (mds->mds_rcvd_filp) {
- rc = filp_close(mds->mds_rcvd_filp, 0);
- mds->mds_rcvd_filp = NULL;
-
- if (rc)
- CERROR("last_rcvd file won't close, rc=%d\n", rc);
+ LOCK_INODE_MUTEX_PARENT(parent_inode);
+ de = lookup_one_len(fidname, mds->mds_objects_dir, namelen);
+ if (IS_ERR(de)) {
+ rc = IS_ERR(de);
+ de = NULL;
+ CERROR("error looking up object "LPU64" %s: rc %d\n",
+ oa->o_id, fidname, rc);
+ GOTO(out_dput, rc);
+ }
+ if (de->d_inode == NULL) {
+ CERROR("destroying non-existent object "LPU64" %s: rc %d\n",
+ oa->o_id, fidname, rc);
+ GOTO(out_dput, rc = -ENOENT);
}
- pop_ctxt(&saved, &mds->mds_ctxt, NULL);
- return rc;
+ /* Stripe count is 1 here since this is some MDS specific stuff
+ that is unlinked, not spanned across multiple OSTs */
+ handle = fsfilt_start_log(obd, mds->mds_objects_dir->d_inode,
+ FSFILT_OP_UNLINK, oti, 1);
+
+ if (IS_ERR(handle))
+ GOTO(out_dput, rc = PTR_ERR(handle));
+
+ /* take a reference to protect inode from truncation within
+ vfs_unlink() context. bug 10409 */
+ inode = de->d_inode;
+ atomic_inc(&inode->i_count);
+ rc = ll_vfs_unlink(mds->mds_objects_dir->d_inode, de, mds->mds_vfsmnt);
+ if (rc)
+ CERROR("error destroying object "LPU64":%u: rc %d\n",
+ oa->o_id, oa->o_generation, rc);
+
+ err = fsfilt_commit(obd, mds->mds_objects_dir->d_inode, handle, 0);
+ if (err && !rc)
+ rc = err;
+out_dput:
+ if (de != NULL)
+ l_dput(de);
+ UNLOCK_INODE_MUTEX(parent_inode);
+
+ if (inode)
+ iput(inode);
+
+ pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &ucred);
+ RETURN(rc);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff