/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * linux/fs/obdfilter/filter.c * * Copyright (c) 2001-2003 Cluster File Systems, Inc. * Author: Peter Braam * 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. */ /* * Invariant: Get O/R i_sem for lookup, if needed, before any journal ops * (which need to get journal_lock, may block if journal full). * * Invariant: Call filter_start_transno() before any journal ops to avoid the * same deadlock problem. We can (and want) to get rid of the * transno sem in favour of the dir/inode i_sem to avoid single * threaded operation on the OST. */ #define DEBUG_SUBSYSTEM S_FILTER #include #include #include #include #include #include #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) # include # include #endif #include #include #include #include #include #include #include "filter_internal.h" #define S_SHIFT 12 static char *obd_type_by_mode[S_IFMT >> S_SHIFT] = { [0] NULL, [S_IFREG >> S_SHIFT] "R", [S_IFDIR >> S_SHIFT] "D", [S_IFCHR >> S_SHIFT] "C", [S_IFBLK >> S_SHIFT] "B", [S_IFIFO >> S_SHIFT] "F", [S_IFSOCK >> S_SHIFT] "S", [S_IFLNK >> S_SHIFT] "L" }; static inline const char *obd_mode_to_type(int mode) { return obd_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; } static void filter_ffd_addref(void *ffdp) { struct filter_file_data *ffd = ffdp; atomic_inc(&ffd->ffd_refcount); CDEBUG(D_INFO, "GETting ffd %p : new refcount %d\n", ffd, atomic_read(&ffd->ffd_refcount)); } static struct filter_file_data *filter_ffd_new(void) { struct filter_file_data *ffd; OBD_ALLOC(ffd, sizeof *ffd); if (ffd == NULL) { CERROR("out of memory\n"); return NULL; } atomic_set(&ffd->ffd_refcount, 2); INIT_LIST_HEAD(&ffd->ffd_handle.h_link); class_handle_hash(&ffd->ffd_handle, filter_ffd_addref); return ffd; } static struct filter_file_data *filter_handle2ffd(struct lustre_handle *handle) { struct filter_file_data *ffd = NULL; ENTRY; LASSERT(handle != NULL); ffd = class_handle2object(handle->cookie); if (ffd != NULL) LASSERT(ffd->ffd_file->private_data == ffd); RETURN(ffd); } static void filter_ffd_put(struct filter_file_data *ffd) { CDEBUG(D_INFO, "PUTting ffd %p : new refcount %d\n", ffd, atomic_read(&ffd->ffd_refcount) - 1); LASSERT(atomic_read(&ffd->ffd_refcount) > 0 && atomic_read(&ffd->ffd_refcount) < 0x5a5a); if (atomic_dec_and_test(&ffd->ffd_refcount)) { LASSERT(list_empty(&ffd->ffd_handle.h_link)); OBD_FREE(ffd, sizeof *ffd); } } static void filter_ffd_destroy(struct filter_file_data *ffd) { class_handle_unhash(&ffd->ffd_handle); filter_ffd_put(ffd); } static void filter_commit_cb(struct obd_device *obd, __u64 transno, void *cb_data, int error) { obd_transno_commit_cb(obd, transno, error); } static int filter_client_log_cancel(struct lustre_handle *conn, struct lov_stripe_md *lsm, int count, struct llog_cookie *cookies, int flags) { struct obd_device *obd = class_conn2obd(conn); struct llog_commit_data *llcd; struct filter_obd *filter = &obd->u.filter; int rc = 0; ENTRY; if (count == 0 || cookies == NULL) { down(&filter->fo_sem); if (filter->fo_llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW)) GOTO(out, rc); llcd = filter->fo_llcd; GOTO(send_now, rc); } down(&filter->fo_sem); llcd = filter->fo_llcd; if (llcd == NULL) { llcd = llcd_grab(); if (llcd == NULL) { CERROR("couldn't get an llcd - dropped "LPX64":%x+%u\n", cookies->lgc_lgl.lgl_oid, cookies->lgc_lgl.lgl_ogen, cookies->lgc_index); GOTO(out, rc = -ENOMEM); } llcd->llcd_import = filter->fo_mdc_imp; filter->fo_llcd = llcd; } memcpy(llcd->llcd_cookies + llcd->llcd_cookiebytes, cookies, sizeof(*cookies)); llcd->llcd_cookiebytes += sizeof(*cookies); GOTO(send_now, rc); send_now: if ((PAGE_SIZE - llcd->llcd_cookiebytes < sizeof(*cookies) || flags & OBD_LLOG_FL_SENDNOW)) { filter->fo_llcd = NULL; llcd_send(llcd); } out: up(&filter->fo_sem); return rc; } /* When this (destroy) operation is committed, return the cancel cookie */ static void filter_cancel_cookies_cb(struct obd_device *obd, __u64 transno, void *cb_data, int error) { filter_client_log_cancel(&obd->u.filter.fo_mdc_conn, NULL, 1, cb_data, OBD_LLOG_FL_SENDNOW); OBD_FREE(cb_data, sizeof(struct llog_cookie)); } /* Assumes caller has already pushed us into the kernel context. */ int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti, int rc) { struct filter_obd *filter = &exp->exp_obd->u.filter; struct filter_export_data *fed = &exp->exp_filter_data; struct filter_client_data *fcd = fed->fed_fcd; __u64 last_rcvd; loff_t off; ssize_t written; /* Propagate error code. */ if (rc) RETURN(rc); if (!exp->exp_obd->obd_replayable) RETURN(rc); /* we don't allocate new transnos for replayed requests */ if (oti != NULL && oti->oti_transno == 0) { spin_lock(&filter->fo_translock); last_rcvd = le64_to_cpu(filter->fo_fsd->fsd_last_transno) + 1; filter->fo_fsd->fsd_last_transno = cpu_to_le64(last_rcvd); spin_unlock(&filter->fo_translock); oti->oti_transno = last_rcvd; fcd->fcd_last_rcvd = cpu_to_le64(last_rcvd); fcd->fcd_mount_count = filter->fo_fsd->fsd_mount_count; /* could get xid from oti, if it's ever needed */ fcd->fcd_last_xid = 0; off = fed->fed_lr_off; fsfilt_set_last_rcvd(exp->exp_obd, last_rcvd, oti->oti_handle, filter_commit_cb, NULL); written = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp, (char *)fcd, sizeof(*fcd), &off); CDEBUG(D_HA, "wrote trans #"LPD64" for client %s at #%d: " "written = "LPSZ"\n", last_rcvd, fcd->fcd_uuid, fed->fed_lr_idx, written); if (written == sizeof(*fcd)) RETURN(0); CERROR("error writing to %s: rc = %d\n", LAST_RCVD, (int)written); if (written >= 0) RETURN(-ENOSPC); RETURN(written); } RETURN(0); } void f_dput(struct dentry *dentry) { /* Can't go inside filter_ddelete because it can block */ CDEBUG(D_INODE, "putting %s: %p, count = %d\n", dentry->d_name.name, dentry, atomic_read(&dentry->d_count) - 1); LASSERT(atomic_read(&dentry->d_count) > 0); dput(dentry); } /* Not racy w.r.t. others, because we are the only user of this dentry */ static void filter_drelease(struct dentry *dentry) { if (dentry->d_fsdata) OBD_FREE(dentry->d_fsdata, sizeof(struct filter_dentry_data)); } struct dentry_operations filter_dops = { d_release: filter_drelease, }; /* Add client data to the FILTER. We use a bitmap to locate a free space * in the last_rcvd file if cl_idx is -1 (i.e. a new client). * Otherwise, we have just read the data from the last_rcvd file and * we know its offset. */ static int filter_client_add(struct obd_device *obd, struct filter_obd *filter, struct filter_export_data *fed, int cl_idx) { unsigned long *bitmap = filter->fo_last_rcvd_slots; int new_client = (cl_idx == -1); ENTRY; LASSERT(bitmap != NULL); /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */ if (!strcmp(fed->fed_fcd->fcd_uuid, "OBD_CLASS_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, FILTER_LR_MAX_CLIENTS); repeat: if (cl_idx >= FILTER_LR_MAX_CLIENTS) { CERROR("no client slots - fix FILTER_LR_MAX_CLIENTS\n"); RETURN(-ENOMEM); } if (test_and_set_bit(cl_idx, bitmap)) { CERROR("FILTER client %d: found bit is set in bitmap\n", cl_idx); cl_idx = find_next_zero_bit(bitmap, FILTER_LR_MAX_CLIENTS, cl_idx); goto repeat; } } else { if (test_and_set_bit(cl_idx, bitmap)) { CERROR("FILTER client %d: bit already set in bitmap!\n", cl_idx); LBUG(); } } fed->fed_lr_idx = cl_idx; fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->fsd_client_start) + cl_idx * le16_to_cpu(filter->fo_fsd->fsd_client_size); CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n", fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid); if (new_client) { struct obd_run_ctxt saved; loff_t off = fed->fed_lr_off; int written; void *handle; CDEBUG(D_INFO, "writing client fcd at idx %u (%llu) (len %u)\n", fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_fcd)); push_ctxt(&saved, &filter->fo_ctxt, NULL); /* Transaction needed to fix bug 1403 */ handle = fsfilt_start(obd, filter->fo_rcvd_filp->f_dentry->d_inode, FSFILT_OP_SETATTR, NULL); if (IS_ERR(handle)) { written = PTR_ERR(handle); CERROR("unable to start transaction: rc %d\n", (int)written); } else { written = fsfilt_write_record(obd, filter->fo_rcvd_filp, (char *)fed->fed_fcd, sizeof(*fed->fed_fcd), &off); fsfilt_commit(obd, filter->fo_rcvd_filp->f_dentry->d_inode, handle, 0); } pop_ctxt(&saved, &filter->fo_ctxt, NULL); if (written != sizeof(*fed->fed_fcd)) { CERROR("error writing %s client idx %u: rc %d\n", LAST_RCVD, fed->fed_lr_idx, written); if (written < 0) RETURN(written); RETURN(-ENOSPC); } } RETURN(0); } static int filter_client_free(struct obd_export *exp, int flags) { struct filter_export_data *fed = &exp->exp_filter_data; struct filter_obd *filter = &exp->exp_obd->u.filter; struct obd_device *obd = exp->exp_obd; struct filter_client_data zero_fcd; struct obd_run_ctxt saved; int written; loff_t off; ENTRY; if (fed->fed_fcd == NULL) RETURN(0); if (flags & OBD_OPT_FAILOVER) GOTO(free, 0); /* XXX if fcd_uuid were a real obd_uuid, I could use obd_uuid_equals */ if (strcmp(fed->fed_fcd->fcd_uuid, "OBD_CLASS_UUID") == 0) GOTO(free, 0); LASSERT(filter->fo_last_rcvd_slots != NULL); off = fed->fed_lr_off; CDEBUG(D_INFO, "freeing client at idx %u (%lld) with UUID '%s'\n", fed->fed_lr_idx, fed->fed_lr_off, fed->fed_fcd->fcd_uuid); if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) { CERROR("FILTER client %u: bit already clear in bitmap!!\n", fed->fed_lr_idx); LBUG(); } memset(&zero_fcd, 0, sizeof zero_fcd); push_ctxt(&saved, &filter->fo_ctxt, NULL); written = fsfilt_write_record(obd, filter->fo_rcvd_filp, (char *)&zero_fcd, sizeof(zero_fcd), &off); /* XXX: this write gets lost sometimes, unless this sync is here. */ if (written > 0) file_fsync(filter->fo_rcvd_filp, filter->fo_rcvd_filp->f_dentry, 1); pop_ctxt(&saved, &filter->fo_ctxt, NULL); if (written != sizeof(zero_fcd)) { CERROR("error zeroing out client %s idx %u (%llu) in %s: %d\n", fed->fed_fcd->fcd_uuid, fed->fed_lr_idx, fed->fed_lr_off, LAST_RCVD, written); } else { CDEBUG(D_INFO, "zeroed disconnecting client %s at idx %u (%llu)\n", fed->fed_fcd->fcd_uuid, fed->fed_lr_idx,fed->fed_lr_off); } free: OBD_FREE(fed->fed_fcd, sizeof(*fed->fed_fcd)); RETURN(0); } static int filter_free_server_data(struct filter_obd *filter) { OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd)); filter->fo_fsd = NULL; OBD_FREE(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long)); filter->fo_last_rcvd_slots = NULL; return 0; } /* assumes caller is already in kernel ctxt */ int filter_update_server_data(struct obd_device *obd, struct file *filp, struct filter_server_data *fsd) { loff_t off = 0; int rc; ENTRY; CDEBUG(D_INODE, "server uuid : %s\n", fsd->fsd_uuid); CDEBUG(D_INODE, "server last_objid: "LPU64"\n", le64_to_cpu(fsd->fsd_last_objid)); CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n", le64_to_cpu(fsd->fsd_last_transno)); CDEBUG(D_INODE, "server last_mount: "LPU64"\n", le64_to_cpu(fsd->fsd_mount_count)); rc = fsfilt_write_record(obd, filp, (char *)fsd, sizeof(*fsd), &off); if (rc == sizeof(*fsd)) RETURN(0); CDEBUG(D_INODE, "error writing filter_server_data: rc = %d\n", rc); if (rc >= 0) RETURN(-ENOSPC); RETURN(rc); } /* assumes caller has already in kernel ctxt */ static int filter_init_server_data(struct obd_device *obd, struct file * filp, __u64 init_lastobjid) { struct filter_obd *filter = &obd->u.filter; struct filter_server_data *fsd; struct filter_client_data *fcd = NULL; struct inode *inode = filp->f_dentry->d_inode; unsigned long last_rcvd_size = inode->i_size; __u64 mount_count = 0; int cl_idx; loff_t off = 0; int rc; /* ensure padding in the struct is the correct size */ LASSERT (offsetof(struct filter_server_data, fsd_padding) + sizeof(fsd->fsd_padding) == FILTER_LR_SERVER_SIZE); LASSERT (offsetof(struct filter_client_data, fcd_padding) + sizeof(fcd->fcd_padding) == FILTER_LR_CLIENT_SIZE); OBD_ALLOC(fsd, sizeof(*fsd)); if (!fsd) RETURN(-ENOMEM); filter->fo_fsd = fsd; OBD_ALLOC(filter->fo_last_rcvd_slots, FILTER_LR_MAX_CLIENT_WORDS * sizeof(unsigned long)); if (filter->fo_last_rcvd_slots == NULL) { OBD_FREE(fsd, sizeof(*fsd)); RETURN(-ENOMEM); } if (last_rcvd_size == 0) { CWARN("%s: initializing new %s\n", obd->obd_name, LAST_RCVD); memcpy(fsd->fsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->fsd_uuid)); fsd->fsd_last_objid = cpu_to_le64(init_lastobjid); fsd->fsd_last_transno = 0; mount_count = fsd->fsd_mount_count = 0; fsd->fsd_server_size = cpu_to_le32(FILTER_LR_SERVER_SIZE); fsd->fsd_client_start = cpu_to_le32(FILTER_LR_CLIENT_START); fsd->fsd_client_size = cpu_to_le16(FILTER_LR_CLIENT_SIZE); fsd->fsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT); filter->fo_subdir_count = FILTER_SUBDIR_COUNT; } else { int retval = fsfilt_read_record(obd, filp, (char *)fsd, sizeof(*fsd), &off); if (retval != sizeof(*fsd)) { CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n", LAST_RCVD, retval); GOTO(err_fsd, rc = -EIO); } mount_count = le64_to_cpu(fsd->fsd_mount_count); filter->fo_subdir_count = le16_to_cpu(fsd->fsd_subdir_count); fsd->fsd_last_objid = cpu_to_le64(le64_to_cpu(fsd->fsd_last_objid) + FILTER_SKIP_OBJID); } if (fsd->fsd_feature_incompat) { CERROR("unsupported feature %x\n", le32_to_cpu(fsd->fsd_feature_incompat)); GOTO(err_fsd, rc = -EINVAL); } if (fsd->fsd_feature_rocompat) { CERROR("read-only feature %x\n", le32_to_cpu(fsd->fsd_feature_rocompat)); /* Do something like remount filesystem read-only */ GOTO(err_fsd, rc = -EINVAL); } CDEBUG(D_INODE, "%s: server last_objid: "LPU64"\n", obd->obd_name, le64_to_cpu(fsd->fsd_last_objid)); CDEBUG(D_INODE, "%s: server last_rcvd : "LPU64"\n", obd->obd_name, le64_to_cpu(fsd->fsd_last_transno)); CDEBUG(D_INODE, "%s: server last_mount: "LPU64"\n", obd->obd_name, mount_count); CDEBUG(D_INODE, "%s: server data size: %u\n", obd->obd_name, le32_to_cpu(fsd->fsd_server_size)); CDEBUG(D_INODE, "%s: per-client data start: %u\n", obd->obd_name, le32_to_cpu(fsd->fsd_client_start)); CDEBUG(D_INODE, "%s: per-client data size: %u\n", obd->obd_name, le32_to_cpu(fsd->fsd_client_size)); CDEBUG(D_INODE, "%s: server subdir_count: %u\n", obd->obd_name, le16_to_cpu(fsd->fsd_subdir_count)); if (!obd->obd_replayable) { CWARN("%s: recovery support OFF\n", obd->obd_name); GOTO(out, rc = 0); } for (cl_idx = 0; off < last_rcvd_size; cl_idx++) { __u64 last_rcvd; int mount_age; if (!fcd) { OBD_ALLOC(fcd, sizeof(*fcd)); if (!fcd) GOTO(err_fsd, rc = -ENOMEM); } /* Don't assume off is incremented properly, in case * sizeof(fsd) isn't the same as fsd->fsd_client_size. */ off = le32_to_cpu(fsd->fsd_client_start) + cl_idx * le16_to_cpu(fsd->fsd_client_size); rc = fsfilt_read_record(obd, filp, (char *)fcd, sizeof(*fcd), &off); if (rc != sizeof(*fcd)) { CERROR("error reading FILTER %s offset %d: rc = %d\n", LAST_RCVD, cl_idx, rc); if (rc > 0) /* XXX fatal error or just abort reading? */ rc = -EIO; break; } if (fcd->fcd_uuid[0] == '\0') { CDEBUG(D_INFO, "skipping zeroed client at offset %d\n", cl_idx); continue; } last_rcvd = le64_to_cpu(fcd->fcd_last_rcvd); /* These exports are cleaned up by filter_disconnect(), so they * need to be set up like real exports as filter_connect() does. */ mount_age = mount_count - le64_to_cpu(fcd->fcd_mount_count); if (mount_age < FILTER_MOUNT_RECOV) { struct obd_export *exp = class_new_export(obd); struct filter_export_data *fed; CERROR("RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64 " srv lr: "LPU64" mnt: "LPU64" last mount: " LPU64"\n", fcd->fcd_uuid, cl_idx, last_rcvd, le64_to_cpu(fsd->fsd_last_transno), le64_to_cpu(fcd->fcd_mount_count), mount_count); if (exp == NULL) { /* XXX this rc is ignored */ rc = -ENOMEM; break; } memcpy(&exp->exp_client_uuid.uuid, fcd->fcd_uuid, sizeof exp->exp_client_uuid.uuid); fed = &exp->exp_filter_data; fed->fed_fcd = fcd; filter_client_add(obd, filter, fed, cl_idx); /* create helper if export init gets more complex */ INIT_LIST_HEAD(&fed->fed_open_head); spin_lock_init(&fed->fed_lock); fcd = NULL; obd->obd_recoverable_clients++; class_export_put(exp); } else { CDEBUG(D_INFO, "discarded client %d UUID '%s' count "LPU64"\n", cl_idx, fcd->fcd_uuid, le64_to_cpu(fcd->fcd_mount_count)); } CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n", cl_idx, last_rcvd); if (last_rcvd > le64_to_cpu(filter->fo_fsd->fsd_last_transno)) filter->fo_fsd->fsd_last_transno=cpu_to_le64(last_rcvd); obd->obd_last_committed = le64_to_cpu(filter->fo_fsd->fsd_last_transno); if (obd->obd_recoverable_clients) { CERROR("RECOVERY: %d recoverable clients, last_rcvd " LPU64"\n", obd->obd_recoverable_clients, le64_to_cpu(filter->fo_fsd->fsd_last_transno)); obd->obd_next_recovery_transno = obd->obd_last_committed + 1; obd->obd_recovering = 1; } } if (fcd) OBD_FREE(fcd, sizeof(*fcd)); out: fsd->fsd_mount_count = cpu_to_le64(mount_count + 1); /* save it, so mount count and last_transno is current */ rc = filter_update_server_data(obd, filp, filter->fo_fsd); RETURN(rc); err_fsd: filter_free_server_data(filter); RETURN(rc); } /* setup the object store with correct subdirectories */ static int filter_prep(struct obd_device *obd) { struct obd_run_ctxt saved; struct filter_obd *filter = &obd->u.filter; struct dentry *dentry, *O_dentry; struct file *file; struct inode *inode; int i; int rc = 0; int mode = 0; push_ctxt(&saved, &filter->fo_ctxt, NULL); dentry = simple_mkdir(current->fs->pwd, "O", 0700); CDEBUG(D_INODE, "got/created O: %p\n", dentry); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot open/create O: rc = %d\n", rc); GOTO(out, rc); } filter->fo_dentry_O = dentry; /* * Create directories and/or get dentries for each object type. * This saves us from having to do multiple lookups for each one. */ O_dentry = filter->fo_dentry_O; for (mode = 0; mode < (S_IFMT >> S_SHIFT); mode++) { char *name = obd_type_by_mode[mode]; if (!name) { filter->fo_dentry_O_mode[mode] = NULL; continue; } dentry = simple_mkdir(O_dentry, name, 0700); CDEBUG(D_INODE, "got/created O/%s: %p\n", name, dentry); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("cannot create O/%s: rc = %d\n", name, rc); GOTO(err_O_mode, rc); } filter->fo_dentry_O_mode[mode] = dentry; } file = filp_open(LAST_RCVD, O_RDWR | O_CREAT | O_LARGEFILE, 0700); if (!file || IS_ERR(file)) { rc = PTR_ERR(file); CERROR("OBD filter: cannot open/create %s: rc = %d\n", LAST_RCVD, rc); GOTO(err_O_mode, rc); } 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_filp, rc = -ENOENT); } rc = fsfilt_journal_data(obd, file); if (rc) { CERROR("cannot journal data on %s: rc = %d\n", LAST_RCVD, rc); GOTO(err_filp, rc); } /* steal operations */ inode = file->f_dentry->d_inode; filter->fo_fop = file->f_op; filter->fo_iop = inode->i_op; filter->fo_aops = inode->i_mapping->a_ops; #ifdef I_SKIP_PDFLUSH /* * we need this to protect from deadlock * pdflush vs. lustre_fwrite() */ inode->i_flags |= I_SKIP_PDFLUSH; #endif rc = filter_init_server_data(obd, file, FILTER_INIT_OBJID); if (rc) { CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc); GOTO(err_client, rc); } filter->fo_rcvd_filp = file; if (filter->fo_subdir_count) { O_dentry = filter->fo_dentry_O_mode[S_IFREG >> S_SHIFT]; OBD_ALLOC(filter->fo_dentry_O_sub, filter->fo_subdir_count * sizeof(dentry)); if (!filter->fo_dentry_O_sub) GOTO(err_client, rc = -ENOMEM); for (i = 0; i < filter->fo_subdir_count; i++) { char dir[20]; snprintf(dir, sizeof(dir), "d%u", i); dentry = simple_mkdir(O_dentry, dir, 0700); CDEBUG(D_INODE, "got/created O/R/%s: %p\n", dir,dentry); if (IS_ERR(dentry)) { rc = PTR_ERR(dentry); CERROR("can't create O/R/%s: rc = %d\n",dir,rc); GOTO(err_O_sub, rc); } filter->fo_dentry_O_sub[i] = dentry; } } rc = 0; out: pop_ctxt(&saved, &filter->fo_ctxt, NULL); return(rc); err_O_sub: while (i-- > 0) { struct dentry *dentry = filter->fo_dentry_O_sub[i]; if (dentry) { f_dput(dentry); filter->fo_dentry_O_sub[i] = NULL; } } OBD_FREE(filter->fo_dentry_O_sub, filter->fo_subdir_count * sizeof(dentry)); err_client: class_disconnect_exports(obd, 0); err_filp: if (filp_close(file, 0)) CERROR("can't close %s after error\n", LAST_RCVD); filter->fo_rcvd_filp = NULL; err_O_mode: while (mode-- > 0) { struct dentry *dentry = filter->fo_dentry_O_mode[mode]; if (dentry) { f_dput(dentry); filter->fo_dentry_O_mode[mode] = NULL; } } f_dput(filter->fo_dentry_O); filter->fo_dentry_O = NULL; goto out; } /* cleanup the filter: write last used object id to status file */ static void filter_post(struct obd_device *obd) { struct obd_run_ctxt saved; struct filter_obd *filter = &obd->u.filter; long rc; int mode; /* XXX: filter_update_lastobjid used to call fsync_dev. It might be * best to start a transaction with h_sync, because we removed this * from lastobjid */ push_ctxt(&saved, &filter->fo_ctxt, NULL); rc = filter_update_server_data(obd, filter->fo_rcvd_filp, filter->fo_fsd); if (rc) CERROR("error writing lastobjid: rc = %ld\n", rc); if (filter->fo_rcvd_filp) { rc = file_fsync(filter->fo_rcvd_filp, filter->fo_rcvd_filp->f_dentry, 1); filp_close(filter->fo_rcvd_filp, 0); filter->fo_rcvd_filp = NULL; if (rc) CERROR("error closing %s: rc = %ld\n", LAST_RCVD, rc); } if (filter->fo_subdir_count) { int i; for (i = 0; i < filter->fo_subdir_count; i++) { struct dentry *dentry = filter->fo_dentry_O_sub[i]; f_dput(dentry); filter->fo_dentry_O_sub[i] = NULL; } OBD_FREE(filter->fo_dentry_O_sub, filter->fo_subdir_count * sizeof(*filter->fo_dentry_O_sub)); } for (mode = 0; mode < (S_IFMT >> S_SHIFT); mode++) { struct dentry *dentry = filter->fo_dentry_O_mode[mode]; if (dentry) { f_dput(dentry); filter->fo_dentry_O_mode[mode] = NULL; } } f_dput(filter->fo_dentry_O); filter_free_server_data(filter); pop_ctxt(&saved, &filter->fo_ctxt, NULL); } __u64 filter_next_id(struct filter_obd *filter) { obd_id id; LASSERT(filter->fo_fsd != NULL); spin_lock(&filter->fo_objidlock); id = le64_to_cpu(filter->fo_fsd->fsd_last_objid); filter->fo_fsd->fsd_last_objid = cpu_to_le64(id + 1); spin_unlock(&filter->fo_objidlock); return id; } /* direct cut-n-paste of mds_blocking_ast() */ static int filter_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc, void *data, int flag) { int do_ast; ENTRY; if (flag == LDLM_CB_CANCELING) { /* Don't need to do anything here. */ RETURN(0); } /* XXX layering violation! -phil */ l_lock(&lock->l_resource->lr_namespace->ns_lock); /* Get this: if filter_blocking_ast is racing with ldlm_intent_policy, * such that mds_blocking_ast is called just before l_i_p takes the * ns_lock, then by the time we get the lock, we might not be the * correct blocking function anymore. So check, and return early, if * so. */ if (lock->l_blocking_ast != filter_blocking_ast) { l_unlock(&lock->l_resource->lr_namespace->ns_lock); RETURN(0); } lock->l_flags |= LDLM_FL_CBPENDING; do_ast = (!lock->l_readers && !lock->l_writers); l_unlock(&lock->l_resource->lr_namespace->ns_lock); if (do_ast) { struct lustre_handle lockh; int rc; LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel"); ldlm_lock2handle(lock, &lockh); rc = ldlm_cli_cancel(&lockh); if (rc < 0) CERROR("ldlm_cli_cancel: %d\n", rc); } else { LDLM_DEBUG(lock, "Lock still has references, will be " "cancelled later"); } RETURN(0); } static int filter_lock_dentry(struct obd_device *obd, struct dentry *de, ldlm_mode_t lock_mode,struct lustre_handle *lockh) { struct ldlm_res_id res_id = { .name = {0} }; int flags = 0, rc; ENTRY; res_id.name[0] = de->d_inode->i_ino; res_id.name[1] = de->d_inode->i_generation; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL, res_id, LDLM_PLAIN, NULL, 0, lock_mode, &flags, ldlm_completion_ast, filter_blocking_ast, NULL, lockh); RETURN(rc == ELDLM_OK ? 0 : -ENOLCK); /* XXX translate ldlm code */ } /* We never dget the object parent, so DON'T dput it either */ static void filter_parent_unlock(struct dentry *dparent, struct lustre_handle *lockh, ldlm_mode_t lock_mode) { ldlm_lock_decref(lockh, lock_mode); } /* We never dget the object parent, so DON'T dput it either */ struct dentry *filter_parent(struct obd_device *obd, obd_mode mode, obd_id objid) { struct filter_obd *filter = &obd->u.filter; LASSERT(S_ISREG(mode)); /* only regular files for now */ if (!S_ISREG(mode) || filter->fo_subdir_count == 0) return filter->fo_dentry_O_mode[(mode & S_IFMT) >> S_SHIFT]; return filter->fo_dentry_O_sub[objid & (filter->fo_subdir_count - 1)]; } /* We never dget the object parent, so DON'T dput it either */ struct dentry *filter_parent_lock(struct obd_device *obd, obd_mode mode, obd_id objid, ldlm_mode_t lock_mode, struct lustre_handle *lockh) { unsigned long now = jiffies; struct dentry *de = filter_parent(obd, mode, objid); int rc; if (IS_ERR(de)) return de; rc = filter_lock_dentry(obd, de, lock_mode, lockh); if (time_after(jiffies, now + 15 * HZ)) CERROR("slow parent lock %lus\n", (jiffies - now) / HZ); return rc ? ERR_PTR(rc) : de; } /* How to get files, dentries, inodes from object id's. * * If dir_dentry is passed, the caller has already locked the parent * appropriately for this operation (normally a write lock). If * dir_dentry is NULL, we do a read lock while we do the lookup to * avoid races with create/destroy and such changing the directory * internal to the filesystem code. */ struct dentry *filter_fid2dentry(struct obd_device *obd, struct dentry *dir_dentry, obd_mode mode, obd_id id) { struct lustre_handle lockh; struct dentry *dparent = dir_dentry; struct dentry *dchild; char name[32]; int len; ENTRY; if (id == 0) { CERROR("fatal: invalid object id 0\n"); LBUG(); RETURN(ERR_PTR(-ESTALE)); } len = sprintf(name, LPU64, id); if (dir_dentry == NULL) { dparent = filter_parent_lock(obd, mode, id, LCK_PR, &lockh); if (IS_ERR(dparent)) RETURN(dparent); } CDEBUG(D_INODE, "looking up object O/%*s/%s\n", dparent->d_name.len, dparent->d_name.name, name); dchild = ll_lookup_one_len(name, dparent, len); if (dir_dentry == NULL) filter_parent_unlock(dparent, &lockh, LCK_PR); if (IS_ERR(dchild)) { CERROR("child lookup error %ld\n", PTR_ERR(dchild)); RETURN(dchild); } CDEBUG(D_INODE, "got child objid %s: %p, count = %d\n", name, dchild, atomic_read(&dchild->d_count)); LASSERT(atomic_read(&dchild->d_count) > 0); RETURN(dchild); } static struct file *filter_obj_open(struct obd_export *export, struct obd_trans_info *oti, __u64 id, __u32 type, int parent_mode, struct lustre_handle *parent_lockh) { struct obd_device *obd = export->exp_obd; struct filter_obd *filter = &obd->u.filter; struct dentry *dchild = NULL, *dparent = NULL; struct filter_export_data *fed = &export->exp_filter_data; struct filter_dentry_data *fdd = NULL; struct filter_file_data *ffd = NULL; struct obd_run_ctxt saved; char name[24]; struct file *file; int len, cleanup_phase = 0; ENTRY; push_ctxt(&saved, &filter->fo_ctxt, NULL); if (!id) { CERROR("fatal: invalid obdo "LPU64"\n", id); GOTO(cleanup, file = ERR_PTR(-ESTALE)); } if (!(type & S_IFMT)) { CERROR("OBD %s, object "LPU64" has bad type: %o\n", __FUNCTION__, id, type); GOTO(cleanup, file = ERR_PTR(-EINVAL)); } ffd = filter_ffd_new(); if (ffd == NULL) { CERROR("obdfilter: out of memory\n"); GOTO(cleanup, file = ERR_PTR(-ENOMEM)); } cleanup_phase = 1; /* We preallocate this to avoid blocking while holding fo_fddlock */ OBD_ALLOC(fdd, sizeof *fdd); if (fdd == NULL) { CERROR("obdfilter: out of memory\n"); GOTO(cleanup, file = ERR_PTR(-ENOMEM)); } cleanup_phase = 2; dparent = filter_parent_lock(obd, type, id, parent_mode, parent_lockh); if (IS_ERR(dparent)) GOTO(cleanup, file = (void *)dparent); cleanup_phase = 3; len = snprintf(name, sizeof(name), LPU64, id); dchild = ll_lookup_one_len(name, dparent, len); if (IS_ERR(dchild)) GOTO(cleanup, file = (void *)dchild); cleanup_phase = 4; if (dchild->d_inode == NULL) { CERROR("opening non-existent object %s - O_CREAT?\n", name); /* dput(dchild); call filter_create_internal here */ file = ERR_PTR(-ENOENT); GOTO(cleanup, file); } /* dentry_open does a dput(dchild) and mntput(mnt) on error */ mntget(filter->fo_vfsmnt); file = dentry_open(dchild, filter->fo_vfsmnt, O_RDWR | O_LARGEFILE); if (IS_ERR(file)) { dchild = NULL; /* prevent a double dput in step 4 */ CERROR("error opening %s: rc %ld\n", name, PTR_ERR(file)); GOTO(cleanup, file); } spin_lock(&filter->fo_fddlock); if (dchild->d_fsdata) { spin_unlock(&filter->fo_fddlock); OBD_FREE(fdd, sizeof *fdd); fdd = dchild->d_fsdata; LASSERT(fdd->fdd_magic == FILTER_DENTRY_MAGIC); /* should only happen during client recovery */ if (fdd->fdd_flags & FILTER_FLAG_DESTROY) CDEBUG(D_INODE,"opening destroyed object "LPU64"\n",id); atomic_inc(&fdd->fdd_open_count); } else { atomic_set(&fdd->fdd_open_count, 1); fdd->fdd_magic = FILTER_DENTRY_MAGIC; fdd->fdd_flags = 0; fdd->fdd_objid = id; /* If this is racy, then we can use {cmp}xchg and atomic_add */ dchild->d_fsdata = fdd; spin_unlock(&filter->fo_fddlock); } ffd->ffd_file = file; LASSERT(file->private_data == NULL); file->private_data = ffd; if (!dchild->d_op) dchild->d_op = &filter_dops; else LASSERT(dchild->d_op == &filter_dops); spin_lock(&fed->fed_lock); list_add(&ffd->ffd_export_list, &fed->fed_open_head); spin_unlock(&fed->fed_lock); CDEBUG(D_INODE, "opened objid "LPU64": rc = %p\n", id, file); cleanup: switch (cleanup_phase) { case 4: if (IS_ERR(file)) f_dput(dchild); case 3: if (IS_ERR(file)) filter_parent_unlock(dparent, parent_lockh,parent_mode); case 2: if (IS_ERR(file)) OBD_FREE(fdd, sizeof *fdd); case 1: if (IS_ERR(file)) filter_ffd_destroy(ffd); filter_ffd_put(ffd); case 0: pop_ctxt(&saved, &filter->fo_ctxt, NULL); } RETURN(file); } /* Caller must hold LCK_PW on parent and push us into kernel context. * Caller is also required to ensure that dchild->d_inode exists. */ static int filter_destroy_internal(struct obd_device *obd, obd_id objid, struct dentry *dparent, struct dentry *dchild) { struct inode *inode = dchild->d_inode; int rc; ENTRY; if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) { CERROR("destroying objid %*s nlink = %d, count = %d\n", dchild->d_name.len, dchild->d_name.name, inode->i_nlink, atomic_read(&inode->i_count)); } #if 0 /* Tell the clients that the object is gone now and that they should * throw away any cached pages. We don't need to wait until they're * done, so just decref the lock right away and let ldlm_completion_ast * clean up when it's all over. */ ldlm_cli_enqueue(..., LCK_PW, AST_INTENT_DESTROY, &lockh); ldlm_lock_decref(&lockh, LCK_PW); #endif if (0) { struct lustre_handle lockh; int flags = 0, rc; struct ldlm_res_id res_id = { .name = { objid } }; /* This part is a wee bit iffy: we really only want to bust the * locks on our stripe, so that we don't end up bouncing * [0->EOF] locks around on each of the OSTs as the rest of the * destroys get processed. Because we're only talking to * the local LDLM, though, we should only end up locking the * whole of our stripe. When bug 1425 (take all locks on OST * for stripe 0) is fixed, this code should be revisited. */ struct ldlm_extent extent = { 0, OBD_OBJECT_EOF }; rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL, res_id, LDLM_EXTENT, &extent, sizeof(extent), LCK_PW, &flags, ldlm_completion_ast, filter_blocking_ast, NULL, &lockh); /* We only care about the side-effects, just drop the lock. */ ldlm_lock_decref(&lockh, LCK_PW); } rc = vfs_unlink(dparent->d_inode, dchild); if (rc) CERROR("error unlinking objid %*s: rc %d\n", dchild->d_name.len, dchild->d_name.name, rc); RETURN(rc); } /* If closing because we are failing this device, then don't do the unlink on close. */ static int filter_close_internal(struct obd_export *exp, struct filter_file_data *ffd, struct obd_trans_info *oti, int flags) { struct obd_device *obd = exp->exp_obd; struct filter_obd *filter = &obd->u.filter; struct file *filp = ffd->ffd_file; struct dentry *dchild = dget(filp->f_dentry); struct filter_dentry_data *fdd = dchild->d_fsdata; struct lustre_handle parent_lockh; int rc, rc2, cleanup_phase = 0; struct dentry *dparent = NULL; struct obd_run_ctxt saved; ENTRY; LASSERT(filp->private_data == ffd); LASSERT(fdd != NULL); LASSERT(fdd->fdd_magic == FILTER_DENTRY_MAGIC); rc = filp_close(filp, 0); if (atomic_dec_and_test(&fdd->fdd_open_count) && (fdd->fdd_flags & FILTER_FLAG_DESTROY) && !(flags & OBD_OPT_FAILOVER)) { void *handle; push_ctxt(&saved, &filter->fo_ctxt, NULL); cleanup_phase = 1; LASSERT(fdd->fdd_objid > 0); dparent = filter_parent_lock(obd, S_IFREG, fdd->fdd_objid, LCK_PW, &parent_lockh); if (IS_ERR(dparent)) GOTO(cleanup, rc = PTR_ERR(dparent)); cleanup_phase = 2; handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK_LOG, oti); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); if (oti != NULL) { if (oti->oti_handle == NULL) oti->oti_handle = handle; else LASSERT(oti->oti_handle == handle); } #ifdef ENABLE_ORPHANS /* Remove orphan unlink record from log */ llog_cancel_records(filter->fo_catalog, 1, &fdd->fdd_cookie); #endif /* XXX unlink from PENDING directory now too */ rc2 = filter_destroy_internal(obd, fdd->fdd_objid, dparent, dchild); if (rc2 && !rc) rc = rc2; rc = filter_finish_transno(exp, oti, rc); rc2 = fsfilt_commit(obd, dparent->d_inode, handle, 0); if (rc2) { CERROR("error on commit, err = %d\n", rc2); if (!rc) rc = rc2; } } cleanup: switch(cleanup_phase) { case 2: if (rc || oti == NULL) { filter_parent_unlock(dparent, &parent_lockh, LCK_PW); } else { memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh, sizeof(parent_lockh)); oti->oti_ack_locks[0].mode = LCK_PW; } case 1: pop_ctxt(&saved, &filter->fo_ctxt, NULL); case 0: f_dput(dchild); filter_ffd_destroy(ffd); break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } RETURN(rc); } /* mount the file system (secretly) */ int filter_common_setup(struct obd_device *obd, obd_count len, void *buf, char *option) { struct obd_ioctl_data* data = buf; struct filter_obd *filter = &obd->u.filter; struct vfsmount *mnt; int rc = 0; ENTRY; if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2) RETURN(-EINVAL); obd->obd_fsops = fsfilt_get_ops(data->ioc_inlbuf2); if (IS_ERR(obd->obd_fsops)) RETURN(PTR_ERR(obd->obd_fsops)); mnt = do_kern_mount(data->ioc_inlbuf2, MS_NOATIME | MS_NODIRATIME, data->ioc_inlbuf1, option); rc = PTR_ERR(mnt); if (IS_ERR(mnt)) GOTO(err_ops, rc); if (data->ioc_inllen3 > 0 && data->ioc_inlbuf3) { if (*data->ioc_inlbuf3 == 'f') { obd->obd_replayable = 1; obd_sync_filter = 1; CERROR("%s: configured for recovery and sync write\n", obd->obd_name); } else { if (*data->ioc_inlbuf3 != 'n') { CERROR("unrecognised flag '%c'\n", *data->ioc_inlbuf3); } } } if (data->ioc_inllen4 > 0 && data->ioc_inlbuf4) { if (*data->ioc_inlbuf4 == '/') { CERROR("filter namespace mount: %s\n", data->ioc_inlbuf4); filter->fo_nspath = strdup(data->ioc_inlbuf4); } else { CERROR("namespace mount must be absolute path: '%s'\n", data->ioc_inlbuf4); } } filter->fo_vfsmnt = mnt; filter->fo_sb = mnt->mnt_sb; filter->fo_fstype = mnt->mnt_sb->s_type->name; CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt); OBD_SET_CTXT_MAGIC(&filter->fo_ctxt); filter->fo_ctxt.pwdmnt = mnt; filter->fo_ctxt.pwd = mnt->mnt_root; filter->fo_ctxt.fs = get_ds(); rc = filter_prep(obd); if (rc) GOTO(err_mntput, rc); spin_lock_init(&filter->fo_translock); spin_lock_init(&filter->fo_fddlock); spin_lock_init(&filter->fo_objidlock); INIT_LIST_HEAD(&filter->fo_export_list); ptlrpc_init_client(MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL, "filter_mdc", &filter->fo_mdc_client); sema_init(&filter->fo_sem, 1); obd->obd_namespace = ldlm_namespace_new("filter-tgt", LDLM_NAMESPACE_SERVER); if (obd->obd_namespace == NULL) GOTO(err_post, rc = -ENOMEM); ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL, "filter_ldlm_cb_client", &obd->obd_ldlm_client); /* Create a non-replaying connection for recovery logging, so that * we don't create a client entry for this local connection, and do * not log or assign transaction numbers for logging operations. */ #ifdef ENABLE_ORPHANS filter->fo_catalog = filter_get_catalog(obd); if (IS_ERR(filter->fo_catalog)) GOTO(err_post, rc = PTR_ERR(filter->fo_catalog)); #endif RETURN(0); err_post: filter_post(obd); err_mntput: unlock_kernel(); mntput(mnt); filter->fo_sb = 0; lock_kernel(); err_ops: fsfilt_put_ops(obd->obd_fsops); return rc; } static int filter_setup(struct obd_device *obd, obd_count len, void *buf) { struct obd_ioctl_data* data = buf; char *option = NULL; #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) /* bug 1577: implement async-delete for 2.5 */ if (!strcmp(data->ioc_inlbuf2, "ext3")) option = "asyncdel"; #endif return filter_common_setup(obd, len, buf, option); } static int filter_cleanup(struct obd_device *obd, int flags) { struct filter_obd *filter = &obd->u.filter; ENTRY; if (flags & OBD_OPT_FAILOVER) CERROR("%s: shutting down for failover; client state will" " be preserved.\n", obd->obd_name); if (!list_empty(&obd->obd_exports)) { CERROR("%s: still has clients!\n", obd->obd_name); class_disconnect_exports(obd, flags); if (!list_empty(&obd->obd_exports)) { CERROR("still has exports after forced cleanup?\n"); RETURN(-EBUSY); } } #ifdef ENABLE_ORPHANS filter_put_catalog(filter->fo_catalog); #endif ldlm_namespace_free(obd->obd_namespace); if (filter->fo_sb == NULL) RETURN(0); filter_post(obd); shrink_dcache_parent(filter->fo_sb->s_root); filter->fo_sb = 0; if (atomic_read(&filter->fo_vfsmnt->mnt_count) > 1) CERROR("%s: mount point busy, mnt_count: %d\n", obd->obd_name, atomic_read(&filter->fo_vfsmnt->mnt_count)); unlock_kernel(); mntput(filter->fo_vfsmnt); //destroy_buffers(filter->fo_sb->s_dev); filter->fo_sb = NULL; fsfilt_put_ops(obd->obd_fsops); lock_kernel(); RETURN(0); } static int filter_attach(struct obd_device *obd, obd_count len, void *data) { struct lprocfs_static_vars lvars; int rc; lprocfs_init_vars(filter, &lvars); rc = lprocfs_obd_attach(obd, lvars.obd_vars); if (rc != 0) return rc; rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST); if (rc != 0) return rc; /* Init obdfilter private stats here */ lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES, LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes"); lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES, LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes"); return rc; } static int filter_detach(struct obd_device *dev) { lprocfs_free_obd_stats(dev); return lprocfs_obd_detach(dev); } /* nearly identical to mds_connect */ static int filter_connect(struct lustre_handle *conn, struct obd_device *obd, struct obd_uuid *cluuid) { struct obd_export *exp; struct filter_export_data *fed; struct filter_client_data *fcd; struct filter_obd *filter = &obd->u.filter; int rc; ENTRY; if (conn == NULL || obd == NULL || cluuid == NULL) RETURN(-EINVAL); rc = class_connect(conn, obd, cluuid); if (rc) RETURN(rc); exp = class_conn2export(conn); LASSERT(exp != NULL); fed = &exp->exp_filter_data; class_export_put(exp); INIT_LIST_HEAD(&fed->fed_open_head); spin_lock_init(&fed->fed_lock); if (!obd->obd_replayable) RETURN(0); OBD_ALLOC(fcd, sizeof(*fcd)); if (!fcd) { CERROR("filter: out of memory for client data\n"); GOTO(out_export, rc = -ENOMEM); } memcpy(fcd->fcd_uuid, cluuid, sizeof(fcd->fcd_uuid)); fed->fed_fcd = fcd; fcd->fcd_mount_count = cpu_to_le64(filter->fo_fsd->fsd_mount_count); rc = filter_client_add(obd, filter, fed, -1); if (rc) GOTO(out_fcd, rc); RETURN(rc); out_fcd: OBD_FREE(fcd, sizeof(*fcd)); out_export: class_disconnect(conn, 0); RETURN(rc); } static void filter_destroy_export(struct obd_export *exp) { struct filter_export_data *fed = &exp->exp_filter_data; ENTRY; spin_lock(&fed->fed_lock); while (!list_empty(&fed->fed_open_head)) { struct filter_file_data *ffd; ffd = list_entry(fed->fed_open_head.next, typeof(*ffd), ffd_export_list); list_del(&ffd->ffd_export_list); spin_unlock(&fed->fed_lock); CDEBUG(D_INFO, "force close file %*s (hdl %p:"LPX64") on " "disconnect\n", ffd->ffd_file->f_dentry->d_name.len, ffd->ffd_file->f_dentry->d_name.name, ffd, ffd->ffd_handle.h_cookie); filter_close_internal(exp, ffd, NULL, exp->exp_flags); spin_lock(&fed->fed_lock); } spin_unlock(&fed->fed_lock); if (exp->exp_obd->obd_replayable) filter_client_free(exp, exp->exp_flags); EXIT; } /* also incredibly similar to mds_disconnect */ static int filter_disconnect(struct lustre_handle *conn, int flags) { struct obd_export *exp = class_conn2export(conn); unsigned long irqflags; int rc; ENTRY; LASSERT(exp); ldlm_cancel_locks_for_export(exp); spin_lock_irqsave(&exp->exp_lock, irqflags); exp->exp_flags = flags; spin_unlock_irqrestore(&exp->exp_lock, irqflags); rc = class_disconnect(conn, flags); fsfilt_sync(exp->exp_obd, exp->exp_obd->u.filter.fo_sb); class_export_put(exp); /* XXX cleanup preallocated inodes */ RETURN(rc); } struct dentry *__filter_oa2dentry(struct obd_device *obd, struct obdo *oa, const char *what) { struct dentry *dchild = NULL; if (oa->o_valid & OBD_MD_FLHANDLE) { struct lustre_handle *ost_handle = obdo_handle(oa); struct filter_file_data *ffd = filter_handle2ffd(ost_handle); if (ffd != NULL) { struct filter_dentry_data *fdd; dchild = dget(ffd->ffd_file->f_dentry); fdd = dchild->d_fsdata; LASSERT(fdd->fdd_magic == FILTER_DENTRY_MAGIC); filter_ffd_put(ffd); CDEBUG(D_INODE,"%s got child objid %*s: %p, count %d\n", what, dchild->d_name.len, dchild->d_name.name, dchild, atomic_read(&dchild->d_count)); } } if (!dchild) dchild = filter_fid2dentry(obd, NULL, oa->o_mode, oa->o_id); if (IS_ERR(dchild)) { CERROR("%s error looking up object: "LPU64"\n", what, oa->o_id); RETURN(dchild); } if (!dchild->d_inode) { CERROR("%s on non-existent object: "LPU64"\n", what, oa->o_id); f_dput(dchild); RETURN(ERR_PTR(-ENOENT)); } return dchild; } static int filter_getattr(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *md) { struct dentry *dentry = NULL; struct obd_device *obd; int rc = 0; ENTRY; obd = class_conn2obd(conn); if (obd == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",conn->cookie); RETURN(-EINVAL); } dentry = filter_oa2dentry(obd, oa); if (IS_ERR(dentry)) RETURN(PTR_ERR(dentry)); /* Limit the valid bits in the return data to what we actually use */ oa->o_valid = OBD_MD_FLID; obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS); f_dput(dentry); RETURN(rc); } /* this is called from filter_truncate() until we have filter_punch() */ static int filter_setattr(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *md, struct obd_trans_info *oti) { struct obd_run_ctxt saved; struct obd_export *exp; struct filter_obd *filter; struct dentry *dentry; struct iattr iattr; void *handle; int rc, rc2; ENTRY; LASSERT(oti != NULL); exp = class_conn2export(conn); if (!exp) { CERROR("invalid client cookie "LPX64"\n", conn->cookie); RETURN(-EINVAL); } dentry = filter_oa2dentry(exp->exp_obd, oa); if (IS_ERR(dentry)) GOTO(out_exp, rc = PTR_ERR(dentry)); filter = &exp->exp_obd->u.filter; iattr_from_obdo(&iattr, oa, oa->o_valid); push_ctxt(&saved, &filter->fo_ctxt, NULL); lock_kernel(); /* XXX this could be a rwsem instead, if filter_preprw played along */ if (iattr.ia_valid & ATTR_SIZE) down(&dentry->d_inode->i_sem); handle = fsfilt_start(exp->exp_obd, dentry->d_inode, FSFILT_OP_SETATTR, oti); if (IS_ERR(handle)) GOTO(out_unlock, rc = PTR_ERR(handle)); rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1); rc = filter_finish_transno(exp, oti, rc); rc2 = fsfilt_commit(exp->exp_obd, dentry->d_inode, handle, 0); if (rc2) { CERROR("error on commit, err = %d\n", rc2); if (!rc) rc = rc2; } if (iattr.ia_valid & ATTR_SIZE) up(&dentry->d_inode->i_sem); oa->o_valid = OBD_MD_FLID; obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS); out_unlock: unlock_kernel(); pop_ctxt(&saved, &filter->fo_ctxt, NULL); f_dput(dentry); out_exp: class_export_put(exp); RETURN(rc); } static int filter_open(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *ea, struct obd_trans_info *oti, struct obd_client_handle *och) { struct obd_export *exp; struct lustre_handle *handle; struct filter_file_data *ffd; struct file *filp; struct lustre_handle parent_lockh; int rc = 0; ENTRY; exp = class_conn2export(conn); if (exp == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",conn->cookie); RETURN(-EINVAL); } filp = filter_obj_open(exp, oti, oa->o_id, oa->o_mode, LCK_PR, &parent_lockh); if (IS_ERR(filp)) GOTO(out, rc = PTR_ERR(filp)); oa->o_valid = OBD_MD_FLID; obdo_from_inode(oa, filp->f_dentry->d_inode, FILTER_VALID_FLAGS); ffd = filp->private_data; handle = obdo_handle(oa); handle->cookie = ffd->ffd_handle.h_cookie; oa->o_valid |= OBD_MD_FLHANDLE; out: class_export_put(exp); if (!rc) { memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh, sizeof(parent_lockh)); oti->oti_ack_locks[0].mode = LCK_PR; } RETURN(rc); } static int filter_close(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *ea, struct obd_trans_info *oti) { struct obd_export *exp; struct filter_file_data *ffd; struct filter_export_data *fed; int rc; ENTRY; exp = class_conn2export(conn); if (exp == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",conn->cookie); RETURN(-EINVAL); } if (!(oa->o_valid & OBD_MD_FLHANDLE)) { CERROR("no handle for close of objid "LPU64"\n", oa->o_id); GOTO(out, rc = -EINVAL); } ffd = filter_handle2ffd(obdo_handle(oa)); if (ffd == NULL) { CERROR("bad handle ("LPX64") for close\n", obdo_handle(oa)->cookie); GOTO(out, rc = -ESTALE); } fed = &exp->exp_filter_data; spin_lock(&fed->fed_lock); list_del(&ffd->ffd_export_list); spin_unlock(&fed->fed_lock); oa->o_valid = OBD_MD_FLID; obdo_from_inode(oa,ffd->ffd_file->f_dentry->d_inode,FILTER_VALID_FLAGS); rc = filter_close_internal(exp, ffd, oti, 0); filter_ffd_put(ffd); GOTO(out, rc); out: class_export_put(exp); return rc; } static int filter_create(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md **ea, struct obd_trans_info *oti) { struct obd_export *exp; struct obd_device *obd; struct filter_obd *filter; struct obd_run_ctxt saved; struct lustre_handle parent_lockh; struct dentry *dparent; struct ll_fid mds_fid = { .id = 0 }; struct dentry *dchild = NULL; void *handle; int err, rc, cleanup_phase; ENTRY; exp = class_conn2export(conn); if (exp == NULL) { CDEBUG(D_IOCTL,"invalid client cookie "LPX64"\n", conn->cookie); RETURN(-EINVAL); } obd = exp->exp_obd; filter = &obd->u.filter; push_ctxt(&saved, &filter->fo_ctxt, NULL); retry: oa->o_id = filter_next_id(filter); cleanup_phase = 0; dparent = filter_parent_lock(obd, S_IFREG, oa->o_id, LCK_PW, &parent_lockh); if (IS_ERR(dparent)) GOTO(cleanup, rc = PTR_ERR(dparent)); cleanup_phase = 1; dchild = filter_fid2dentry(obd, dparent, S_IFREG, oa->o_id); if (IS_ERR(dchild)) GOTO(cleanup, rc = PTR_ERR(dchild)); if (dchild->d_inode) { /* This would only happen if lastobjid was bad on disk */ CERROR("Serious error: objid %*s already exists; is this " "filesystem corrupt? I will try to work around it.\n", dchild->d_name.len, dchild->d_name.name); f_dput(dchild); filter_parent_unlock(dparent, &parent_lockh, LCK_PW); goto retry; } cleanup_phase = 2; handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_CREATE_LOG, oti); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); rc = vfs_create(dparent->d_inode, dchild, oa->o_mode); if (rc) { CERROR("create failed rc = %d\n", rc); } else if (oa->o_valid & (OBD_MD_FLCTIME|OBD_MD_FLMTIME|OBD_MD_FLSIZE)){ struct iattr attr; iattr_from_obdo(&attr, oa, oa->o_valid); rc = fsfilt_setattr(obd, dchild, handle, &attr, 1); if (rc) CERROR("create setattr failed rc = %d\n", rc); } rc = filter_finish_transno(exp, oti, rc); err = filter_update_server_data(obd, filter->fo_rcvd_filp, filter->fo_fsd); if (err) CERROR("unable to write lastobjid but file created\n"); /* Set flags for fields we have set in the inode struct */ if (!rc && mds_fid.id && (oa->o_valid & OBD_MD_FLCOOKIE)) { err = filter_log_op_create(obd->u.filter.fo_catalog, &mds_fid, dchild->d_inode->i_ino, dchild->d_inode->i_generation, oti->oti_logcookies); if (err) { CERROR("error logging create record: rc %d\n", err); oa->o_valid = OBD_MD_FLID; } else { oa->o_valid = OBD_MD_FLID | OBD_MD_FLCOOKIE; } } else oa->o_valid = OBD_MD_FLID; err = fsfilt_commit(obd, dparent->d_inode, handle, 0); if (err) { CERROR("error on commit, err = %d\n", err); if (!rc) rc = err; } if (rc) GOTO(cleanup, rc); /* Set flags for fields we have set in the inode struct */ obdo_from_inode(oa, dchild->d_inode, FILTER_VALID_FLAGS); EXIT; cleanup: switch(cleanup_phase) { case 2: f_dput(dchild); case 1: /* locked parent dentry */ if (rc || oti == NULL) { filter_parent_unlock(dparent, &parent_lockh, LCK_PW); } else { memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh, sizeof(parent_lockh)); oti->oti_ack_locks[0].mode = LCK_PW; } case 0: pop_ctxt(&saved, &filter->fo_ctxt, NULL); class_export_put(exp); break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } RETURN(rc); } static int filter_destroy(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *ea, struct obd_trans_info *oti) { struct obd_export *exp; struct obd_device *obd; struct filter_obd *filter; struct dentry *dchild = NULL, *dparent = NULL; struct filter_dentry_data *fdd; struct obd_run_ctxt saved; void *handle = NULL; struct lustre_handle parent_lockh; struct llog_cookie *fcc = NULL; int rc, rc2, cleanup_phase = 0; ENTRY; exp = class_conn2export(conn); if (exp == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",conn->cookie); RETURN(-EINVAL); } obd = exp->exp_obd; filter = &obd->u.filter; push_ctxt(&saved, &filter->fo_ctxt, NULL); dparent = filter_parent_lock(obd, oa->o_mode, oa->o_id, LCK_PW, &parent_lockh); if (IS_ERR(dparent)) GOTO(cleanup, rc = PTR_ERR(dparent)); cleanup_phase = 1; dchild = filter_fid2dentry(obd, dparent, S_IFREG, oa->o_id); if (IS_ERR(dchild)) GOTO(cleanup, rc = -ENOENT); cleanup_phase = 2; if (dchild->d_inode == NULL) { CERROR("destroying non-existent object "LPU64"\n", oa->o_id); GOTO(cleanup, rc = -ENOENT); } handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK_LOG, oti); if (IS_ERR(handle)) GOTO(cleanup, rc = PTR_ERR(handle)); cleanup_phase = 3; fdd = dchild->d_fsdata; /* Our MDC connection is established by the MDS to us */ if ((oa->o_valid & OBD_MD_FLCOOKIE) && filter->fo_mdc_imp != NULL) { OBD_ALLOC(fcc, sizeof(*fcc)); if (fcc != NULL) memcpy(fcc, obdo_logcookie(oa), sizeof(*fcc)); } if (fdd != NULL && atomic_read(&fdd->fdd_open_count)) { LASSERT(fdd->fdd_magic == FILTER_DENTRY_MAGIC); if (!(fdd->fdd_flags & FILTER_FLAG_DESTROY)) { fdd->fdd_flags |= FILTER_FLAG_DESTROY; #ifdef ENABLE_ORPHANS filter_log_op_orphan(filter->fo_catalog, oa->o_id, oa->o_generation,&fdd->fdd_cookie); #endif CDEBUG(D_INODE, "defer destroy of %dx open objid "LPU64"\n", atomic_read(&fdd->fdd_open_count), oa->o_id); } else { CDEBUG(D_INODE, "repeat destroy of %dx open objid "LPU64"\n", atomic_read(&fdd->fdd_open_count), oa->o_id); } GOTO(cleanup, rc = 0); } rc = filter_destroy_internal(obd, oa->o_id, dparent, dchild); cleanup: switch(cleanup_phase) { case 3: if (fcc != NULL) fsfilt_set_last_rcvd(obd, 0, oti->oti_handle, filter_cancel_cookies_cb, fcc); rc = filter_finish_transno(exp, oti, rc); rc2 = fsfilt_commit(obd, dparent->d_inode, handle, 0); if (rc2) { CERROR("error on commit, err = %d\n", rc2); if (!rc) rc = rc2; } case 2: f_dput(dchild); case 1: if (rc || oti == NULL) { filter_parent_unlock(dparent, &parent_lockh, LCK_PW); } else { memcpy(&oti->oti_ack_locks[0].lock, &parent_lockh, sizeof(parent_lockh)); oti->oti_ack_locks[0].mode = LCK_PW; } case 0: pop_ctxt(&saved, &filter->fo_ctxt, NULL); class_export_put(exp); break; default: CERROR("invalid cleanup_phase %d\n", cleanup_phase); LBUG(); } RETURN(rc); } /* NB start and end are used for punch, but not truncate */ static int filter_truncate(struct lustre_handle *conn, struct obdo *oa, struct lov_stripe_md *lsm, obd_off start, obd_off end, struct obd_trans_info *oti) { int error; ENTRY; if (end != OBD_OBJECT_EOF) CERROR("PUNCH not supported, only truncate: end = "LPX64"\n", end); CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = %x, " "o_size = "LPD64"\n", oa->o_id, oa->o_valid, start); oa->o_size = start; error = filter_setattr(conn, oa, NULL, oti); RETURN(error); } static int filter_syncfs(struct obd_export *exp) { ENTRY; RETURN(fsfilt_sync(exp->exp_obd, exp->exp_obd->u.filter.fo_sb)); } static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs, unsigned long max_age) { ENTRY; RETURN(fsfilt_statfs(obd, obd->u.filter.fo_sb, osfs)); } static int filter_get_info(struct lustre_handle *conn, __u32 keylen, void *key, __u32 *vallen, void *val) { struct obd_device *obd; ENTRY; obd = class_conn2obd(conn); if (obd == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n", conn->cookie); RETURN(-EINVAL); } if (keylen == strlen("blocksize") && memcmp(key, "blocksize", keylen) == 0) { __u32 *blocksize = val; *vallen = sizeof(*blocksize); *blocksize = obd->u.filter.fo_sb->s_blocksize; RETURN(0); } if (keylen == strlen("blocksize_bits") && memcmp(key, "blocksize_bits", keylen) == 0) { __u32 *blocksize_bits = val; *vallen = sizeof(*blocksize_bits); *blocksize_bits = obd->u.filter.fo_sb->s_blocksize_bits; RETURN(0); } CDEBUG(D_IOCTL, "invalid key\n"); RETURN(-EINVAL); } static int filter_set_info(struct lustre_handle *conn, __u32 keylen, void *key, __u32 vallen, void *val) { struct obd_device *obd; struct obd_export *exp; struct obd_import *imp; ENTRY; obd = class_conn2obd(conn); if (obd == NULL) { CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n", conn->cookie); RETURN(-EINVAL); } if (keylen < strlen("mds_conn") || memcmp(key, "mds_conn", keylen) != 0) RETURN(-EINVAL); CERROR("Received MDS connection ("LPX64")\n", conn->cookie); memcpy(&obd->u.filter.fo_mdc_conn, conn, sizeof(*conn)); imp = obd->u.filter.fo_mdc_imp = class_new_import(); exp = class_conn2export(conn); imp->imp_connection = ptlrpc_connection_addref(exp->exp_connection); class_export_put(exp); imp->imp_client = &obd->u.filter.fo_mdc_client; imp->imp_remote_handle = *conn; imp->imp_obd = obd; imp->imp_dlm_fake = 1; /* XXX rename imp_dlm_fake to something else */ imp->imp_level = LUSTRE_CONN_FULL; class_import_put(imp); RETURN(0); } int filter_iocontrol(unsigned int cmd, struct lustre_handle *conn, int len, void *karg, void *uarg) { struct obd_device *obd = class_conn2obd(conn); switch (cmd) { case OBD_IOC_ABORT_RECOVERY: CERROR("aborting recovery for device %s\n", obd->obd_name); target_abort_recovery(obd); RETURN(0); default: RETURN(-EINVAL); } RETURN(0); } static struct obd_ops filter_obd_ops = { o_owner: THIS_MODULE, o_attach: filter_attach, o_detach: filter_detach, o_get_info: filter_get_info, o_set_info: filter_set_info, o_setup: filter_setup, o_cleanup: filter_cleanup, o_connect: filter_connect, o_disconnect: filter_disconnect, o_statfs: filter_statfs, o_syncfs: filter_syncfs, o_getattr: filter_getattr, o_create: filter_create, o_setattr: filter_setattr, o_destroy: filter_destroy, o_open: filter_open, o_close: filter_close, o_brw: filter_brw, o_punch: filter_truncate, o_preprw: filter_preprw, o_commitrw: filter_commitrw, o_log_cancel: filter_log_cancel, o_destroy_export: filter_destroy_export, o_iocontrol: filter_iocontrol, }; static struct obd_ops filter_sanobd_ops = { o_owner: THIS_MODULE, o_attach: filter_attach, o_detach: filter_detach, o_get_info: filter_get_info, o_set_info: filter_set_info, o_setup: filter_san_setup, o_cleanup: filter_cleanup, o_connect: filter_connect, o_disconnect: filter_disconnect, o_statfs: filter_statfs, o_getattr: filter_getattr, o_create: filter_create, o_setattr: filter_setattr, o_destroy: filter_destroy, o_open: filter_open, o_close: filter_close, o_brw: filter_brw, o_punch: filter_truncate, o_preprw: filter_preprw, o_commitrw: filter_commitrw, o_log_cancel: filter_log_cancel, o_san_preprw: filter_san_preprw, o_destroy_export: filter_destroy_export, o_iocontrol: filter_iocontrol, }; static int __init obdfilter_init(void) { struct lprocfs_static_vars lvars; int rc; printk(KERN_INFO "Lustre Filtering OBD driver; info@clusterfs.com\n"); lprocfs_init_vars(filter, &lvars); rc = class_register_type(&filter_obd_ops, lvars.module_vars, OBD_FILTER_DEVICENAME); if (rc) return rc; rc = class_register_type(&filter_sanobd_ops, lvars.module_vars, OBD_FILTER_SAN_DEVICENAME); if (rc) class_unregister_type(OBD_FILTER_DEVICENAME); return rc; } static void __exit obdfilter_exit(void) { class_unregister_type(OBD_FILTER_SAN_DEVICENAME); class_unregister_type(OBD_FILTER_DEVICENAME); } MODULE_AUTHOR("Cluster File Systems, Inc. "); MODULE_DESCRIPTION("Lustre Filtering OBD driver"); MODULE_LICENSE("GPL"); module_init(obdfilter_init); module_exit(obdfilter_exit);