/* -*- 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 * * Copyright (C) 2002, 2003 Cluster File Systems, Inc. * Author: Andreas Dilger * * This file is part of Lustre, http://www.lustre.org. * * 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. * * 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 * along with Lustre; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef EXPORT_SYMTAB # define EXPORT_SYMTAB #endif #define DEBUG_SUBSYSTEM S_MDS #include #include #include #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)) #include #endif #include #include #include #include #include #include #include #include "mds_internal.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)) #define LAST_RCVD "last_rcvd" #define LOV_OBJID "lov_objid" /* 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 obd_device *obd, struct mds_obd *mds, struct mds_export_data *med, int cl_idx) { unsigned long *bitmap = mds->mds_client_bitmap; int new_client = (cl_idx == -1); ENTRY; LASSERT(bitmap != NULL); /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */ if (!strcmp(med->med_mcd->mcd_uuid, obd->obd_uuid.uuid)) RETURN(0); /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so * there's no need for extra complication here */ if (new_client) { cl_idx = find_first_zero_bit(bitmap, MDS_MAX_CLIENTS); repeat: if (cl_idx >= MDS_MAX_CLIENTS) { CERROR("no room for clients - fix MDS_MAX_CLIENTS\n"); return -ENOMEM; } if (test_and_set_bit(cl_idx, bitmap)) { cl_idx = find_next_zero_bit(bitmap, MDS_MAX_CLIENTS, cl_idx); goto repeat; } } else { if (test_and_set_bit(cl_idx, bitmap)) { CERROR("MDS client %d: bit already set in bitmap!!\n", cl_idx); LBUG(); } } CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n", cl_idx, med->med_mcd->mcd_uuid); med->med_idx = cl_idx; med->med_off = le32_to_cpu(mds->mds_server_data->msd_client_start) + (cl_idx * le16_to_cpu(mds->mds_server_data->msd_client_size)); if (new_client) { struct lvfs_run_ctxt saved; loff_t off = med->med_off; struct file *file = mds->mds_rcvd_filp; int rc; push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); rc = fsfilt_write_record(obd, file, med->med_mcd, sizeof(*med->med_mcd), &off, 1); pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); if (rc) return rc; CDEBUG(D_INFO, "wrote client mcd at idx %u off %llu (len %u)\n", med->med_idx, med->med_off, (unsigned int)sizeof(*med->med_mcd)); } return 0; } int mds_client_free(struct obd_export *exp, int clear_client) { struct mds_export_data *med = &exp->exp_mds_data; struct mds_obd *mds = &exp->exp_obd->u.mds; struct obd_device *obd = exp->exp_obd; struct mds_client_data zero_mcd; struct lvfs_run_ctxt saved; int rc; unsigned long *bitmap = mds->mds_client_bitmap; if (!med->med_mcd) RETURN(0); /* XXX if mcd_uuid were a real obd_uuid, I could use obd_uuid_equals */ if (!strcmp(med->med_mcd->mcd_uuid, obd->obd_uuid.uuid)) GOTO(free_and_out, 0); CDEBUG(D_INFO, "freeing client at idx %u (%lld)with UUID '%s'\n", med->med_idx, med->med_off, med->med_mcd->mcd_uuid); LASSERT(bitmap); /* Clear the bit _after_ zeroing out the client so we don't race with mds_client_add and zero out new clients.*/ if (!test_bit(med->med_idx, bitmap)) { CERROR("MDS client %u: bit already clear in bitmap!!\n", med->med_idx); LBUG(); } if (clear_client) { memset(&zero_mcd, 0, sizeof zero_mcd); push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); rc = fsfilt_write_record(obd, mds->mds_rcvd_filp, &zero_mcd, sizeof(zero_mcd), &med->med_off, 1); pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); CDEBUG(rc == 0 ? D_INFO : D_ERROR, "zeroing out client %s idx %u in %s rc %d\n", med->med_mcd->mcd_uuid, med->med_idx, LAST_RCVD, rc); } if (!test_and_clear_bit(med->med_idx, bitmap)) { CERROR("MDS client %u: bit already clear in bitmap!!\n", med->med_idx); LBUG(); } /* Make sure the server's last_transno is up to date. Do this * after the client is freed so we know all the client's * transactions have been committed. */ mds_update_server_data(exp->exp_obd, 1); free_and_out: 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_client_bitmap, MDS_MAX_CLIENT_WORDS * sizeof(unsigned long)); 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 *obd, struct file *file) { struct mds_obd *mds = &obd->u.mds; struct mds_server_data *msd; struct mds_client_data *mcd = NULL; loff_t off = 0; unsigned long last_rcvd_size = file->f_dentry->d_inode->i_size; __u64 mount_count; int cl_idx, rc = 0; ENTRY; /* ensure padding in the struct is the correct size */ LASSERT(offsetof(struct mds_server_data, msd_padding) + sizeof(msd->msd_padding) == MDS_LR_SERVER_SIZE); LASSERT(offsetof(struct mds_client_data, mcd_padding) + sizeof(mcd->mcd_padding) == MDS_LR_CLIENT_SIZE); OBD_ALLOC_WAIT(msd, sizeof(*msd)); if (!msd) RETURN(-ENOMEM); OBD_ALLOC_WAIT(mds->mds_client_bitmap, MDS_MAX_CLIENT_WORDS * sizeof(unsigned long)); if (!mds->mds_client_bitmap) { OBD_FREE(msd, sizeof(*msd)); RETURN(-ENOMEM); } mds->mds_server_data = msd; if (last_rcvd_size == 0) { CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD); memcpy(msd->msd_uuid, obd->obd_uuid.uuid,sizeof(msd->msd_uuid)); msd->msd_last_transno = 0; mount_count = msd->msd_mount_count = 0; msd->msd_server_size = cpu_to_le32(MDS_LR_SERVER_SIZE); msd->msd_client_start = cpu_to_le32(MDS_LR_CLIENT_START); msd->msd_client_size = cpu_to_le16(MDS_LR_CLIENT_SIZE); msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID); } else { rc = fsfilt_read_record(obd, file, msd, sizeof(*msd), &off); if (rc) { CERROR("error reading MDS %s: rc = %d\n", LAST_RCVD, rc); GOTO(err_msd, rc); } if (strcmp(msd->msd_uuid, obd->obd_uuid.uuid) != 0) { CERROR("OBD UUID %s does not match last_rcvd UUID %s\n", obd->obd_uuid.uuid, msd->msd_uuid); GOTO(err_msd, rc = -EINVAL); } mount_count = le64_to_cpu(msd->msd_mount_count); } if (msd->msd_feature_incompat & ~cpu_to_le32(MDS_INCOMPAT_SUPP)) { CERROR("unsupported incompat feature %x\n", le32_to_cpu(msd->msd_feature_incompat) & ~MDS_INCOMPAT_SUPP); GOTO(err_msd, rc = -EINVAL); } /* XXX updating existing b_devel fs only, can be removed in future */ msd->msd_feature_rocompat = cpu_to_le32(MDS_ROCOMPAT_LOVOBJID); if (msd->msd_feature_rocompat & ~cpu_to_le32(MDS_ROCOMPAT_SUPP)) { CERROR("unsupported read-only feature %x\n", le32_to_cpu(msd->msd_feature_rocompat) & ~MDS_ROCOMPAT_SUPP); /* Do something like remount filesystem read-only */ GOTO(err_msd, rc = -EINVAL); } mds->mds_last_transno = le64_to_cpu(msd->msd_last_transno); CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n", obd->obd_name, mds->mds_last_transno); CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n", obd->obd_name, mount_count + 1); CDEBUG(D_INODE, "%s: server data size: %u\n", obd->obd_name, le32_to_cpu(msd->msd_server_size)); CDEBUG(D_INODE, "%s: per-client data start: %u\n", obd->obd_name, le32_to_cpu(msd->msd_client_start)); CDEBUG(D_INODE, "%s: per-client data size: %u\n", obd->obd_name, le32_to_cpu(msd->msd_client_size)); CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n", obd->obd_name, last_rcvd_size); CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name, last_rcvd_size <= le32_to_cpu(msd->msd_client_start) ? 0 : (last_rcvd_size - le32_to_cpu(msd->msd_client_start)) / le16_to_cpu(msd->msd_client_size)); /* When we do a clean MDS shutdown, we save the last_transno into * the header. If we find clients with higher last_transno values * then those clients may need recovery done. */ for (cl_idx = 0, off = le32_to_cpu(msd->msd_client_start); off < last_rcvd_size; cl_idx++) { __u64 last_transno; struct obd_export *exp; struct mds_export_data *med; if (!mcd) { OBD_ALLOC_WAIT(mcd, sizeof(*mcd)); if (!mcd) GOTO(err_client, rc = -ENOMEM); } /* Don't assume off is incremented properly by * fsfilt_read_record(), in case sizeof(*mcd) * isn't the same as msd->msd_client_size. */ off = le32_to_cpu(msd->msd_client_start) + cl_idx * le16_to_cpu(msd->msd_client_size); rc = fsfilt_read_record(obd, file, mcd, sizeof(*mcd), &off); if (rc) { CERROR("error reading MDS %s idx %d, off %llu: rc %d\n", LAST_RCVD, cl_idx, off, rc); break; /* read error shouldn't cause startup to fail */ } if (mcd->mcd_uuid[0] == '\0') { CDEBUG(D_INFO, "skipping zeroed client at offset %d\n", cl_idx); 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. */ CDEBUG(D_HA|D_WARNING,"RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64 " srv lr: "LPU64" lx: "LPU64"\n", mcd->mcd_uuid, cl_idx, last_transno, le64_to_cpu(msd->msd_last_transno), mcd->mcd_last_xid); exp = class_new_export(obd); if (exp == NULL) GOTO(err_client, rc = -ENOMEM); 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(obd, mds, med, cl_idx); /* create helper if export init gets more complex */ INIT_LIST_HEAD(&med->med_open_head); spin_lock_init(&med->med_open_lock); mcd = NULL; exp->exp_replay_needed = 1; obd->obd_recoverable_clients++; obd->obd_max_recoverable_clients++; class_export_put(exp); CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n", cl_idx, last_transno); if (last_transno > mds->mds_last_transno) mds->mds_last_transno = last_transno; } obd->obd_last_committed = mds->mds_last_transno; if (obd->obd_recoverable_clients) { CWARN("RECOVERY: service %s, %d recoverable clients, " "last_transno "LPU64"\n", obd->obd_name, obd->obd_recoverable_clients, mds->mds_last_transno); obd->obd_next_recovery_transno = obd->obd_last_committed + 1; target_start_recovery_thread(obd, mds_handle); } if (mcd) OBD_FREE(mcd, sizeof(*mcd)); mds->mds_mount_count = mount_count + 1; msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count); /* save it, so mount count and last_transno is current */ rc = mds_update_server_data(obd, 1); RETURN(rc); err_client: class_disconnect_exports(obd, 0); err_msd: mds_server_free_data(mds); RETURN(rc); } static int mds_fs_post_setup(struct obd_device *obd) { struct mds_obd *mds = &obd->u.mds; struct dentry *de = mds_fid2dentry(mds, &mds->mds_rootfid, NULL); int rc = 0; rc = fsfilt_post_setup(obd, de); if (rc) GOTO(out, rc); fsfilt_set_fs_flags(obd, de->d_inode, SM_DO_REC | SM_DO_COW); fsfilt_set_fs_flags(obd, mds->mds_pending_dir->d_inode, SM_DO_REC | SM_DO_COW); fsfilt_set_mds_flags(obd, mds->mds_sb); out: l_dput(de); return rc; } int mds_fs_setup(struct obd_device *obd, struct vfsmount *mnt) { struct mds_obd *mds = &obd->u.mds; struct lvfs_run_ctxt saved; struct dentry *dentry; struct file *file; int rc; ENTRY; rc = cleanup_group_info(); if (rc) RETURN(rc); mds->mds_vfsmnt = mnt; mds->mds_sb = mnt->mnt_root->d_inode->i_sb; fsfilt_setup(obd, mds->mds_sb); 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 = mds_lvfs_ops; /* setup the directory tree */ push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); dentry = simple_mkdir(current->fs->pwd, "ROOT", 0755, 0); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create ROOT directory: rc = %d\n", rc); GOTO(err_pop, rc); } 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 = lookup_one_len("__iopen__", current->fs->pwd, strlen("__iopen__")); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot lookup __iopen__ directory: rc = %d\n", rc); GOTO(err_pop, rc); } if (!dentry->d_inode) { rc = -ENOENT; CERROR("__iopen__ directory has no inode? rc = %d\n", rc); GOTO(err_fid, rc); } mds->mds_fid_de = dentry; dentry = simple_mkdir(current->fs->pwd, "PENDING", 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create PENDING directory: rc = %d\n", rc); GOTO(err_fid, rc); } mds->mds_pending_dir = dentry; dentry = simple_mkdir(current->fs->pwd, "LOGS", 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create LOGS directory: rc = %d\n", rc); GOTO(err_pending, rc); } mds->mds_logs_dir = dentry; dentry = simple_mkdir(current->fs->pwd, "OBJECTS", 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create OBJECTS directory: rc = %d\n", rc); GOTO(err_logs, rc); } mds->mds_objects_dir = dentry; dentry = simple_mkdir(current->fs->pwd, "FIDS", 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create FIDS directory: rc = %d\n", rc); GOTO(err_fids, rc); } mds->mds_fids_dir = dentry; dentry = simple_mkdir(current->fs->pwd, "UNNAMED", 0777, 1); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create UNNAMED directory: rc = %d\n", rc); GOTO(err_unnamed, rc); } mds->mds_unnamed_dir = dentry; /* open and test the last rcvd file */ file = filp_open(LAST_RCVD, O_RDWR | O_CREAT, 0644); if (IS_ERR(file)) { rc = PTR_ERR(file); CERROR("cannot open/create %s file: rc = %d\n", LAST_RCVD, rc); GOTO(err_objects, rc = PTR_ERR(file)); } mds->mds_rcvd_filp = file; if (!S_ISREG(file->f_dentry->d_inode->i_mode)) { CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD, file->f_dentry->d_inode->i_mode); GOTO(err_last_rcvd, rc = -ENOENT); } rc = mds_read_last_rcvd(obd, file); if (rc) { CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc); GOTO(err_last_rcvd, rc); } /* open and test the lov objd file */ file = filp_open(LOV_OBJID, O_RDWR | O_CREAT, 0644); if (IS_ERR(file)) { rc = PTR_ERR(file); CERROR("cannot open/create %s file: rc = %d\n", LOV_OBJID, rc); GOTO(err_client, rc = PTR_ERR(file)); } mds->mds_lov_objid_filp = file; if (!S_ISREG(file->f_dentry->d_inode->i_mode)) { CERROR("%s is not a regular file!: mode = %o\n", LOV_OBJID, file->f_dentry->d_inode->i_mode); GOTO(err_lov_objid, rc = -ENOENT); } err_pop: if (!rc) { rc = mds_fs_post_setup(obd); if (rc) CERROR("can not post setup fsfilt\n"); } pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); return rc; err_lov_objid: if (mds->mds_lov_objid_filp && filp_close(mds->mds_lov_objid_filp, 0)) CERROR("can't close %s after error\n", LOV_OBJID); err_client: class_disconnect_exports(obd, 0); err_last_rcvd: if (mds->mds_rcvd_filp && filp_close(mds->mds_rcvd_filp, 0)) CERROR("can't close %s after error\n", LAST_RCVD); err_unnamed: dput(mds->mds_unnamed_dir); err_fids: dput(mds->mds_fids_dir); err_objects: dput(mds->mds_objects_dir); err_logs: dput(mds->mds_logs_dir); err_pending: dput(mds->mds_pending_dir); err_fid: dput(mds->mds_fid_de); goto err_pop; } static int mds_fs_post_cleanup(struct obd_device *obd) { int rc = 0; rc = fsfilt_post_cleanup(obd); return rc; } int mds_fs_cleanup(struct obd_device *obd, int flags) { struct mds_obd *mds = &obd->u.mds; struct lvfs_run_ctxt saved; int rc = 0; if (flags & OBD_OPT_FAILOVER) CERROR("%s: shutting down for failover; client state will" " be preserved.\n", obd->obd_name); class_disconnect_exports(obd, flags); /* cleans up client info too */ mds_server_free_data(mds); push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); if (mds->mds_rcvd_filp) { rc = filp_close(mds->mds_rcvd_filp, 0); mds->mds_rcvd_filp = NULL; if (rc) CERROR("%s file won't close, rc=%d\n", LAST_RCVD, rc); } if (mds->mds_lov_objid_filp) { rc = filp_close(mds->mds_lov_objid_filp, 0); mds->mds_lov_objid_filp = NULL; if (rc) CERROR("%s file won't close, rc=%d\n", LOV_OBJID, rc); } if (mds->mds_unnamed_dir != NULL) { l_dput(mds->mds_unnamed_dir); mds->mds_unnamed_dir = NULL; } if (mds->mds_fids_dir != NULL) { l_dput(mds->mds_fids_dir); mds->mds_fids_dir = NULL; } if (mds->mds_objects_dir != NULL) { l_dput(mds->mds_objects_dir); mds->mds_objects_dir = NULL; } if (mds->mds_logs_dir) { l_dput(mds->mds_logs_dir); mds->mds_logs_dir = NULL; } if (mds->mds_pending_dir) { l_dput(mds->mds_pending_dir); mds->mds_pending_dir = NULL; } rc = mds_fs_post_cleanup(obd); pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); shrink_dcache_parent(mds->mds_fid_de); dput(mds->mds_fid_de); return rc; } /* 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) { struct mds_obd *mds = &exp->exp_obd->u.mds; struct inode *parent_inode = mds->mds_objects_dir->d_inode; struct file *filp; struct dentry *dchild; struct lvfs_run_ctxt saved; char fidname[LL_FID_NAMELEN]; void *handle; int rc = 0, err, namelen; ENTRY; push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL); down(&parent_inode->i_sem); if (oa->o_id) { namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation); dchild = lookup_one_len(fidname, mds->mds_objects_dir, namelen); if (IS_ERR(dchild)) GOTO(out_pop, rc = PTR_ERR(dchild)); if (dchild->d_inode == NULL) { struct dentry_params dp; struct inode *inode; dchild->d_fsdata = (void *) &dp; dp.p_ptr = NULL; dp.p_inum = oa->o_id; rc = ll_vfs_create(parent_inode, dchild, S_IFREG, NULL); if (dchild->d_fsdata == (void *)(unsigned long)oa->o_id) dchild->d_fsdata = NULL; if (rc) { CDEBUG(D_INODE, "err during create: %d\n", rc); dput(dchild); GOTO(out_pop, rc); } inode = dchild->d_inode; LASSERT(inode->i_ino == oa->o_id); inode->i_generation = oa->o_generation; CDEBUG(D_HA, "recreated ino %lu with gen %u\n", inode->i_ino, inode->i_generation); mark_inode_dirty(inode); } else { CWARN("it should be here!\n"); } GOTO(out_pop, rc); } sprintf(fidname, "OBJECTS/%u.%u",ll_insecure_random_int(),current->pid); filp = filp_open(fidname, O_CREAT | O_EXCL, 0644); if (IS_ERR(filp)) { rc = PTR_ERR(filp); if (rc == -EEXIST) { CERROR("impossible object name collision %s\n", fidname); LBUG(); } CERROR("error creating tmp object %s: rc %d\n", fidname, rc); GOTO(out_pop, rc); } LASSERT(mds->mds_objects_dir == filp->f_dentry->d_parent); 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); dchild = lookup_one_len(fidname, mds->mds_objects_dir, namelen); if (IS_ERR(dchild)) { CERROR("getting neg dentry for obj rename: %d\n", rc); GOTO(out_close, rc = PTR_ERR(dchild)); } if (dchild->d_inode != NULL) { CERROR("impossible non-negative obj dentry " LPU64":%u!\n", oa->o_id, oa->o_generation); LBUG(); } 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 = vfs_rename(mds->mds_objects_dir->d_inode, filp->f_dentry, mds->mds_objects_dir->d_inode, dchild); 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_sb, mds->mds_objects_dir->d_inode, handle, 0); if (!err) { oa->o_gr = FILTER_GROUP_FIRST_MDS + mds->mds_num; oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLGROUP; } else if (!rc) rc = err; out_dput: dput(dchild); out_close: err = filp_close(filp, 0); if (err) { CERROR("closing tmpfile %s: rc %d\n", fidname, rc); if (!rc) rc = err; } out_pop: up(&parent_inode->i_sem); pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL); RETURN(rc); } int mds_obd_destroy(struct obd_export *exp, struct obdo *oa, struct lov_stripe_md *ea, struct obd_trans_info *oti) { 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; char fidname[LL_FID_NAMELEN]; struct dentry *de; void *handle; int err, namelen, rc = 0; ENTRY; push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); namelen = ll_fid2str(fidname, oa->o_id, oa->o_generation); down(&parent_inode->i_sem); de = lookup_one_len(fidname, mds->mds_objects_dir, namelen); if (de == NULL || de->d_inode == NULL) { CERROR("destroying non-existent object "LPU64" %s\n", oa->o_id, fidname); GOTO(out_dput, rc = IS_ERR(de) ? PTR_ERR(de) : -ENOENT); } /* 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)); rc = vfs_unlink(mds->mds_objects_dir->d_inode, de); if (rc) CERROR("error destroying object "LPU64":%u: rc %d\n", oa->o_id, oa->o_generation, rc); err = fsfilt_commit(obd, mds->mds_sb, mds->mds_objects_dir->d_inode, handle, 0); if (err && !rc) rc = err; out_dput: if (de != NULL) l_dput(de); up(&parent_inode->i_sem); pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); RETURN(rc); }