-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, 2013, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/obdclass/llog_lvfs.c
- *
- * OST<->MDS recovery logging infrastructure.
- * Invariants in implementation:
- * - we do not share logs among different OST<->MDS connections, so that
- * if an OST or MDS fails it need only look at log(s) relevant to itself
- *
- * Author: Andreas Dilger <adilger@clusterfs.com>
- */
-
-#define DEBUG_SUBSYSTEM S_LOG
-
-#ifndef __KERNEL__
-#include <liblustre.h>
-#endif
-
-#include <obd.h>
-#include <obd_class.h>
-#include <lustre_log.h>
-#include <obd_ost.h>
-#include <libcfs/list.h>
-#include <lvfs.h>
-#include <lustre_fsfilt.h>
-#include <lustre_disk.h>
-#include "llog_internal.h"
-
-#if defined(__KERNEL__) && defined(LLOG_LVFS)
-
-static int llog_lvfs_pad(struct obd_device *obd, struct l_file *file,
- int len, int index)
-{
- struct llog_rec_hdr rec = { 0 };
- struct llog_rec_tail tail;
- int rc;
- ENTRY;
-
- LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
-
- tail.lrt_len = rec.lrh_len = len;
- tail.lrt_index = rec.lrh_index = index;
- rec.lrh_type = LLOG_PAD_MAGIC;
-
- rc = fsfilt_write_record(obd, file, &rec, sizeof(rec), &file->f_pos, 0);
- if (rc) {
- CERROR("error writing padding record: rc %d\n", rc);
- goto out;
- }
-
- file->f_pos += len - sizeof(rec) - sizeof(tail);
- rc = fsfilt_write_record(obd, file, &tail, sizeof(tail),&file->f_pos,0);
- if (rc) {
- CERROR("error writing padding record: rc %d\n", rc);
- goto out;
- }
-
- out:
- RETURN(rc);
-}
-
-static int llog_lvfs_write_blob(struct obd_device *obd, struct l_file *file,
- struct llog_rec_hdr *rec, void *buf, loff_t off)
-{
- int rc;
- struct llog_rec_tail end;
- loff_t saved_off = file->f_pos;
- int buflen = rec->lrh_len;
-
- ENTRY;
-
- file->f_pos = off;
-
- if (buflen == 0)
- CWARN("0-length record\n");
-
- if (!buf) {
- rc = fsfilt_write_record(obd, file, rec, buflen,&file->f_pos,0);
- if (rc) {
- CERROR("error writing log record: rc %d\n", rc);
- goto out;
- }
- GOTO(out, rc = 0);
- }
-
- /* the buf case */
- rec->lrh_len = sizeof(*rec) + buflen + sizeof(end);
- rc = fsfilt_write_record(obd, file, rec, sizeof(*rec), &file->f_pos, 0);
- if (rc) {
- CERROR("error writing log hdr: rc %d\n", rc);
- goto out;
- }
-
- rc = fsfilt_write_record(obd, file, buf, buflen, &file->f_pos, 0);
- if (rc) {
- CERROR("error writing log buffer: rc %d\n", rc);
- goto out;
- }
-
- end.lrt_len = rec->lrh_len;
- end.lrt_index = rec->lrh_index;
- rc = fsfilt_write_record(obd, file, &end, sizeof(end), &file->f_pos, 0);
- if (rc) {
- CERROR("error writing log tail: rc %d\n", rc);
- goto out;
- }
-
- rc = 0;
- out:
- if (saved_off > file->f_pos)
- file->f_pos = saved_off;
- LASSERT(rc <= 0);
- RETURN(rc);
-}
-
-static int llog_lvfs_read_blob(struct obd_device *obd, struct l_file *file,
- void *buf, int size, loff_t off)
-{
- loff_t offset = off;
- int rc;
- ENTRY;
-
- rc = fsfilt_read_record(obd, file, buf, size, &offset);
- if (rc) {
- CERROR("error reading log record: rc %d\n", rc);
- RETURN(rc);
- }
- RETURN(0);
-}
-
-static int llog_lvfs_read_header(const struct lu_env *env,
- struct llog_handle *handle)
-{
- struct obd_device *obd;
- int rc;
- ENTRY;
-
- LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
-
- obd = handle->lgh_ctxt->loc_exp->exp_obd;
-
- if (i_size_read(handle->lgh_file->f_dentry->d_inode) == 0) {
- CDEBUG(D_HA, "not reading header from 0-byte log\n");
- RETURN(LLOG_EEMPTY);
- }
-
- rc = llog_lvfs_read_blob(obd, handle->lgh_file, handle->lgh_hdr,
- LLOG_CHUNK_SIZE, 0);
- if (rc) {
- CERROR("error reading log header from %.*s\n",
- handle->lgh_file->f_dentry->d_name.len,
- handle->lgh_file->f_dentry->d_name.name);
- } else {
- struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
-
- if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
- lustre_swab_llog_hdr(handle->lgh_hdr);
-
- if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
- CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
- handle->lgh_file->f_dentry->d_name.len,
- handle->lgh_file->f_dentry->d_name.name,
- llh_hdr->lrh_type, LLOG_HDR_MAGIC);
- rc = -EIO;
- } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
- CERROR("incorrectly sized log %.*s header: %#x "
- "(expected %#x)\n",
- handle->lgh_file->f_dentry->d_name.len,
- handle->lgh_file->f_dentry->d_name.name,
- llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
- CERROR("you may need to re-run lconf --write_conf.\n");
- rc = -EIO;
- }
- }
-
- handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
- handle->lgh_file->f_pos = i_size_read(handle->lgh_file->f_dentry->d_inode);
-
- RETURN(rc);
-}
-
-/* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
-/* appends if idx == -1, otherwise overwrites record idx. */
-static int llog_lvfs_write_rec(const struct lu_env *env,
- struct llog_handle *loghandle,
- struct llog_rec_hdr *rec,
- struct llog_cookie *reccookie, int cookiecount,
- void *buf, int idx, struct thandle *th)
-{
- struct llog_log_hdr *llh;
- int reclen = rec->lrh_len, index, rc;
- struct llog_rec_tail *lrt;
- struct obd_device *obd;
- struct file *file;
- size_t left;
- ENTRY;
-
- llh = loghandle->lgh_hdr;
- file = loghandle->lgh_file;
- obd = loghandle->lgh_ctxt->loc_exp->exp_obd;
-
- /* record length should not bigger than LLOG_CHUNK_SIZE */
- if (buf)
- rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
- sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
- else
- rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
- if (rc)
- RETURN(rc);
-
- if (buf)
- /* write_blob adds header and tail to lrh_len. */
- reclen = sizeof(*rec) + rec->lrh_len +
- sizeof(struct llog_rec_tail);
-
- if (idx != -1) {
- loff_t saved_offset;
-
- /* no header: only allowed to insert record 1 */
- if (idx != 1 && !i_size_read(file->f_dentry->d_inode)) {
- CERROR("idx != -1 in empty log\n");
- LBUG();
- }
-
- if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
- RETURN(-EINVAL);
-
- if (!ext2_test_bit(idx, llh->llh_bitmap))
- CERROR("Modify unset record %u\n", idx);
- if (idx != rec->lrh_index)
- CERROR("Index mismatch %d %u\n", idx, rec->lrh_index);
-
- rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
- /* we are done if we only write the header or on error */
- if (rc || idx == 0)
- RETURN(rc);
-
- if (buf) {
- /* We assume that caller has set lgh_cur_* */
- saved_offset = loghandle->lgh_cur_offset;
- CDEBUG(D_OTHER,
- "modify record "DOSTID": idx:%d/%u/%d, len:%u "
- "offset %llu\n",
- POSTID(&loghandle->lgh_id.lgl_oi), idx, rec->lrh_index,
- loghandle->lgh_cur_idx, rec->lrh_len,
- (long long)(saved_offset - sizeof(*llh)));
- if (rec->lrh_index != loghandle->lgh_cur_idx) {
- CERROR("modify idx mismatch %u/%d\n",
- idx, loghandle->lgh_cur_idx);
- RETURN(-EFAULT);
- }
- } else {
- /* Assumes constant lrh_len */
- saved_offset = sizeof(*llh) + (idx - 1) * reclen;
- }
-
- rc = llog_lvfs_write_blob(obd, file, rec, buf, saved_offset);
- if (rc == 0 && reccookie) {
- reccookie->lgc_lgl = loghandle->lgh_id;
- reccookie->lgc_index = idx;
- rc = 1;
- }
- RETURN(rc);
- }
-
- /* Make sure that records don't cross a chunk boundary, so we can
- * process them page-at-a-time if needed. If it will cross a chunk
- * boundary, write in a fake (but referenced) entry to pad the chunk.
- *
- * We know that llog_current_log() will return a loghandle that is
- * big enough to hold reclen, so all we care about is padding here.
- */
- left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
-
- /* NOTE: padding is a record, but no bit is set */
- if (left != 0 && left != reclen &&
- left < (reclen + LLOG_MIN_REC_SIZE)) {
- index = loghandle->lgh_last_idx + 1;
- rc = llog_lvfs_pad(obd, file, left, index);
- if (rc)
- RETURN(rc);
- loghandle->lgh_last_idx++; /*for pad rec*/
- }
- /* if it's the last idx in log file, then return -ENOSPC */
- if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
- RETURN(-ENOSPC);
- loghandle->lgh_last_idx++;
- index = loghandle->lgh_last_idx;
- LASSERT(index < LLOG_BITMAP_SIZE(llh));
- rec->lrh_index = index;
- if (buf == NULL) {
- lrt = (struct llog_rec_tail *)
- ((char *)rec + rec->lrh_len - sizeof(*lrt));
- lrt->lrt_len = rec->lrh_len;
- lrt->lrt_index = rec->lrh_index;
- }
- /*The caller should make sure only 1 process access the lgh_last_idx,
- *Otherwise it might hit the assert.*/
- LASSERT(index < LLOG_BITMAP_SIZE(llh));
- spin_lock(&loghandle->lgh_hdr_lock);
- if (ext2_set_bit(index, llh->llh_bitmap)) {
- CERROR("argh, index %u already set in log bitmap?\n", index);
- spin_unlock(&loghandle->lgh_hdr_lock);
- LBUG(); /* should never happen */
- }
- llh->llh_count++;
- spin_unlock(&loghandle->lgh_hdr_lock);
- llh->llh_tail.lrt_index = index;
-
- rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
- if (rc)
- RETURN(rc);
-
- rc = llog_lvfs_write_blob(obd, file, rec, buf, file->f_pos);
- if (rc)
- RETURN(rc);
-
- CDEBUG(D_RPCTRACE, "added record "DOSTID": idx: %u, %u \n",
- POSTID(&loghandle->lgh_id.lgl_oi), index, rec->lrh_len);
- if (rc == 0 && reccookie) {
- reccookie->lgc_lgl = loghandle->lgh_id;
- reccookie->lgc_index = index;
- if ((rec->lrh_type == MDS_UNLINK_REC) ||
- (rec->lrh_type == MDS_SETATTR64_REC))
- reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
- else if (rec->lrh_type == OST_SZ_REC)
- reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
- else
- reccookie->lgc_subsys = -1;
- rc = 1;
- }
- if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
- rc = 1;
-
- RETURN(rc);
-}
-
-/* We can skip reading at least as many log blocks as the number of
-* minimum sized log records we are skipping. If it turns out
-* that we are not far enough along the log (because the
-* actual records are larger than minimum size) we just skip
-* some more records. */
-
-static void llog_skip_over(__u64 *off, int curr, int goal)
-{
- if (goal <= curr)
- return;
- *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
- ~(LLOG_CHUNK_SIZE - 1);
-}
-
-
-/* sets:
- * - cur_offset to the furthest point read in the log file
- * - cur_idx to the log index preceeding cur_offset
- * returns -EIO/-EINVAL on error
- */
-static int llog_lvfs_next_block(const struct lu_env *env,
- struct llog_handle *loghandle, int *cur_idx,
- int next_idx, __u64 *cur_offset, void *buf,
- int len)
-{
- int rc;
- ENTRY;
-
- if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
- RETURN(-EINVAL);
-
- CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
- next_idx, *cur_idx, *cur_offset);
-
- while (*cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
- struct llog_rec_hdr *rec, *last_rec;
- struct llog_rec_tail *tail;
- loff_t ppos;
- int llen;
-
- llog_skip_over(cur_offset, *cur_idx, next_idx);
-
- /* read up to next LLOG_CHUNK_SIZE block */
- ppos = *cur_offset;
- llen = LLOG_CHUNK_SIZE - (*cur_offset & (LLOG_CHUNK_SIZE - 1));
- rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
- loghandle->lgh_file, buf, llen,
- cur_offset);
- if (rc < 0) {
- CERROR("Cant read llog block at log id "DOSTID
- "/%u offset "LPU64"\n",
- POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen,
- *cur_offset);
- RETURN(rc);
- }
-
- /* put number of bytes read into rc to make code simpler */
- rc = *cur_offset - ppos;
- if (rc < len) {
- /* signal the end of the valid buffer to llog_process */
- memset(buf + rc, 0, len - rc);
- }
-
- if (rc == 0) /* end of file, nothing to do */
- RETURN(0);
-
- if (rc < sizeof(*tail)) {
- CERROR("Invalid llog block at log id "DOSTID"/%u offset"
- LPU64"\n", POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen, *cur_offset);
- RETURN(-EINVAL);
- }
-
- rec = buf;
- if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
- lustre_swab_llog_rec(rec);
-
- tail = (struct llog_rec_tail *)(buf + rc -
- sizeof(struct llog_rec_tail));
-
- /* get the last record in block */
- last_rec = (struct llog_rec_hdr *)(buf + rc -
- le32_to_cpu(tail->lrt_len));
-
- if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
- lustre_swab_llog_rec(last_rec);
- LASSERT(last_rec->lrh_index == tail->lrt_index);
-
- *cur_idx = tail->lrt_index;
-
- /* this shouldn't happen */
- if (tail->lrt_index == 0) {
- CERROR("Invalid llog tail at log id "DOSTID"/%u offset "
- LPU64"\n", POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen, *cur_offset);
- RETURN(-EINVAL);
- }
- if (tail->lrt_index < next_idx)
- continue;
-
- /* sanity check that the start of the new buffer is no farther
- * than the record that we wanted. This shouldn't happen. */
- if (rec->lrh_index > next_idx) {
- CERROR("missed desired record? %u > %u\n",
- rec->lrh_index, next_idx);
- RETURN(-ENOENT);
- }
- RETURN(0);
- }
- RETURN(-EIO);
-}
-
-static int llog_lvfs_prev_block(const struct lu_env *env,
- struct llog_handle *loghandle,
- int prev_idx, void *buf, int len)
-{
- __u64 cur_offset;
- int rc;
- ENTRY;
-
- if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
- RETURN(-EINVAL);
-
- CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
-
- cur_offset = LLOG_CHUNK_SIZE;
- llog_skip_over(&cur_offset, 0, prev_idx);
-
- while (cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
- struct llog_rec_hdr *rec, *last_rec;
- struct llog_rec_tail *tail;
- loff_t ppos = cur_offset;
-
- rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
- loghandle->lgh_file, buf, len,
- &cur_offset);
- if (rc < 0) {
- CERROR("Cant read llog block at log id "DOSTID
- "/%u offset "LPU64"\n",
- POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen,
- cur_offset);
- RETURN(rc);
- }
-
- /* put number of bytes read into rc to make code simpler */
- rc = cur_offset - ppos;
-
- if (rc == 0) /* end of file, nothing to do */
- RETURN(0);
-
- if (rc < sizeof(*tail)) {
- CERROR("Invalid llog block at log id "DOSTID"/%u offset"
- LPU64"\n", POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen, cur_offset);
- RETURN(-EINVAL);
- }
-
- rec = buf;
- if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
- lustre_swab_llog_rec(rec);
-
- tail = (struct llog_rec_tail *)(buf + rc -
- sizeof(struct llog_rec_tail));
-
- /* get the last record in block */
- last_rec = (struct llog_rec_hdr *)(buf + rc -
- le32_to_cpu(tail->lrt_len));
-
- if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
- lustre_swab_llog_rec(last_rec);
- LASSERT(last_rec->lrh_index == tail->lrt_index);
-
- /* this shouldn't happen */
- if (tail->lrt_index == 0) {
- CERROR("Invalid llog tail at log id "DOSTID"/%u offset"
- LPU64"\n", POSTID(&loghandle->lgh_id.lgl_oi),
- loghandle->lgh_id.lgl_ogen, cur_offset);
- RETURN(-EINVAL);
- }
- if (tail->lrt_index < prev_idx)
- continue;
-
- /* sanity check that the start of the new buffer is no farther
- * than the record that we wanted. This shouldn't happen. */
- if (rec->lrh_index > prev_idx) {
- CERROR("missed desired record? %u > %u\n",
- rec->lrh_index, prev_idx);
- RETURN(-ENOENT);
- }
- RETURN(0);
- }
- RETURN(-EIO);
-}
-
-static struct file *llog_filp_open(char *dir, char *name, int flags, int mode)
-{
- char *logname;
- struct file *filp;
- int len;
-
- OBD_ALLOC(logname, PATH_MAX);
- if (logname == NULL)
- return ERR_PTR(-ENOMEM);
-
- len = snprintf(logname, PATH_MAX, "%s/%s", dir, name);
- if (len >= PATH_MAX - 1) {
- filp = ERR_PTR(-ENAMETOOLONG);
- } else {
- filp = l_filp_open(logname, flags, mode);
- if (IS_ERR(filp) && PTR_ERR(filp) != -ENOENT)
- CERROR("logfile creation %s: %ld\n", logname,
- PTR_ERR(filp));
- }
- OBD_FREE(logname, PATH_MAX);
- return filp;
-}
-
-static int llog_lvfs_open(const struct lu_env *env, struct llog_handle *handle,
- struct llog_logid *logid, char *name,
- enum llog_open_param open_param)
-{
- struct llog_ctxt *ctxt = handle->lgh_ctxt;
- struct l_dentry *dchild = NULL;
- struct obd_device *obd;
- int rc = 0;
-
- ENTRY;
-
- LASSERT(ctxt);
- LASSERT(ctxt->loc_exp);
- LASSERT(ctxt->loc_exp->exp_obd);
- obd = ctxt->loc_exp->exp_obd;
-
- LASSERT(handle);
- if (logid != NULL) {
- dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, &logid->lgl_oi,
- logid->lgl_ogen);
- if (IS_ERR(dchild)) {
- rc = PTR_ERR(dchild);
- CERROR("%s: error looking up logfile #"DOSTID "#%08x:"
- " rc = %d\n", ctxt->loc_obd->obd_name,
- POSTID(&logid->lgl_oi), logid->lgl_ogen, rc);
- GOTO(out, rc);
- }
- if (dchild->d_inode == NULL) {
- l_dput(dchild);
- rc = -ENOENT;
- CERROR("%s: nonexistent llog #"DOSTID"#%08x:"
- "rc = %d\n", ctxt->loc_obd->obd_name,
- POSTID(&logid->lgl_oi), logid->lgl_ogen, rc);
- GOTO(out, rc);
- }
- handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
- O_RDWR | O_LARGEFILE);
- l_dput(dchild);
- if (IS_ERR(handle->lgh_file)) {
- rc = PTR_ERR(handle->lgh_file);
- handle->lgh_file = NULL;
- CERROR("%s: error opening llog #"DOSTID"#%08x:"
- "rc = %d\n", ctxt->loc_obd->obd_name,
- POSTID(&logid->lgl_oi), logid->lgl_ogen, rc);
- GOTO(out, rc);
- }
- handle->lgh_id = *logid;
- } else if (name) {
- handle->lgh_file = llog_filp_open(MOUNT_CONFIGS_DIR, name,
- O_RDWR | O_LARGEFILE, 0644);
- if (IS_ERR(handle->lgh_file)) {
- rc = PTR_ERR(handle->lgh_file);
- handle->lgh_file = NULL;
- if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
- OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
- if (handle->lgh_name)
- strcpy(handle->lgh_name, name);
- else
- GOTO(out, rc = -ENOMEM);
- rc = 0;
- } else {
- GOTO(out, rc);
- }
- } else {
- lustre_build_llog_lvfs_oid(&handle->lgh_id,
- handle->lgh_file->f_dentry->d_inode->i_ino,
- handle->lgh_file->f_dentry->d_inode->i_generation);
- }
- } else {
- LASSERTF(open_param == LLOG_OPEN_NEW, "%#x\n", open_param);
- handle->lgh_file = NULL;
- }
-
- /* No new llog is expected but doesn't exist */
- if (open_param != LLOG_OPEN_NEW && handle->lgh_file == NULL)
- GOTO(out_name, rc = -ENOENT);
-
- RETURN(0);
-out_name:
- if (handle->lgh_name != NULL)
- OBD_FREE(handle->lgh_name, strlen(name) + 1);
-out:
- RETURN(rc);
-}
-
-static int llog_lvfs_exist(struct llog_handle *handle)
-{
- return (handle->lgh_file != NULL);
-}
-
-/* This is a callback from the llog_* functions.
- * Assumes caller has already pushed us into the kernel context. */
-static int llog_lvfs_create(const struct lu_env *env,
- struct llog_handle *handle,
- struct thandle *th)
-{
- struct llog_ctxt *ctxt = handle->lgh_ctxt;
- struct obd_device *obd;
- struct l_dentry *dchild = NULL;
- struct file *file;
- struct obdo *oa = NULL;
- int rc = 0;
- int open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
-
- ENTRY;
-
- LASSERT(ctxt);
- LASSERT(ctxt->loc_exp);
- obd = ctxt->loc_exp->exp_obd;
- LASSERT(handle->lgh_file == NULL);
-
- if (handle->lgh_name) {
- file = llog_filp_open(MOUNT_CONFIGS_DIR, handle->lgh_name,
- open_flags, 0644);
- if (IS_ERR(file))
- RETURN(PTR_ERR(file));
-
- lustre_build_llog_lvfs_oid(&handle->lgh_id,
- file->f_dentry->d_inode->i_ino,
- file->f_dentry->d_inode->i_generation);
- handle->lgh_file = file;
- } else {
- OBDO_ALLOC(oa);
- if (oa == NULL)
- RETURN(-ENOMEM);
-
- ostid_set_seq_llog(&oa->o_oi);
- oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
-
- rc = obd_create(NULL, ctxt->loc_exp, oa, NULL, NULL);
- if (rc)
- GOTO(out, rc);
-
- /* FIXME: rationalize the misuse of o_generation in
- * this API along with mds_obd_{create,destroy}.
- * Hopefully it is only an internal API issue. */
-#define o_generation o_parent_oid
- dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, &oa->o_oi,
- oa->o_generation);
- if (IS_ERR(dchild))
- GOTO(out, rc = PTR_ERR(dchild));
-
- file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild, open_flags);
- l_dput(dchild);
- if (IS_ERR(file))
- GOTO(out, rc = PTR_ERR(file));
- handle->lgh_id.lgl_oi = oa->o_oi;
- handle->lgh_id.lgl_ogen = oa->o_generation;
- handle->lgh_file = file;
-out:
- OBDO_FREE(oa);
- }
- RETURN(rc);
-}
-
-static int llog_lvfs_close(const struct lu_env *env,
- struct llog_handle *handle)
-{
- int rc;
-
- ENTRY;
-
- if (handle->lgh_file == NULL)
- RETURN(0);
- rc = filp_close(handle->lgh_file, 0);
- if (rc)
- CERROR("%s: error closing llog #"DOSTID"#%08x: "
- "rc = %d\n", handle->lgh_ctxt->loc_obd->obd_name,
- POSTID(&handle->lgh_id.lgl_oi),
- handle->lgh_id.lgl_ogen, rc);
- handle->lgh_file = NULL;
- if (handle->lgh_name) {
- OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
- handle->lgh_name = NULL;
- }
- RETURN(rc);
-}
-
-static int llog_lvfs_destroy(const struct lu_env *env,
- struct llog_handle *handle)
-{
- struct dentry *fdentry;
- struct obdo *oa;
- struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
- char *dir;
- void *th;
- struct inode *inode;
- int rc, rc1;
- ENTRY;
-
- dir = MOUNT_CONFIGS_DIR;
-
- LASSERT(handle->lgh_file);
- fdentry = handle->lgh_file->f_dentry;
- inode = fdentry->d_parent->d_inode;
- if (strcmp(fdentry->d_parent->d_name.name, dir) == 0) {
- struct lvfs_run_ctxt saved;
- struct vfsmount *mnt = mntget(handle->lgh_file->f_vfsmnt);
-
- push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
- dget(fdentry);
- rc = llog_lvfs_close(env, handle);
- if (rc == 0) {
- mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
- rc = vfs_unlink(inode, fdentry);
- mutex_unlock(&inode->i_mutex);
- }
- mntput(mnt);
-
- dput(fdentry);
- pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
- RETURN(rc);
- }
-
- OBDO_ALLOC(oa);
- if (oa == NULL)
- RETURN(-ENOMEM);
-
- oa->o_oi = handle->lgh_id.lgl_oi;
- oa->o_generation = handle->lgh_id.lgl_ogen;
-#undef o_generation
- oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
-
- rc = llog_lvfs_close(env, handle);
- if (rc)
- GOTO(out, rc);
-
- th = fsfilt_start_log(obd, inode, FSFILT_OP_UNLINK, NULL, 1);
- if (IS_ERR(th)) {
- CERROR("fsfilt_start failed: %ld\n", PTR_ERR(th));
- GOTO(out, rc = PTR_ERR(th));
- }
-
- rc = obd_destroy(NULL, handle->lgh_ctxt->loc_exp, oa,
- NULL, NULL, NULL, NULL);
-
- rc1 = fsfilt_commit(obd, inode, th, 0);
- if (rc == 0 && rc1 != 0)
- rc = rc1;
- out:
- OBDO_FREE(oa);
- RETURN(rc);
-}
-
-static int llog_lvfs_declare_create(const struct lu_env *env,
- struct llog_handle *res,
- struct thandle *th)
-{
- return 0;
-}
-
-static int llog_lvfs_declare_write_rec(const struct lu_env *env,
- struct llog_handle *loghandle,
- struct llog_rec_hdr *rec,
- int idx, struct thandle *th)
-{
- return 0;
-}
-
-struct llog_operations llog_lvfs_ops = {
- .lop_write_rec = llog_lvfs_write_rec,
- .lop_next_block = llog_lvfs_next_block,
- .lop_prev_block = llog_lvfs_prev_block,
- .lop_read_header = llog_lvfs_read_header,
- .lop_create = llog_lvfs_create,
- .lop_destroy = llog_lvfs_destroy,
- .lop_close = llog_lvfs_close,
- .lop_open = llog_lvfs_open,
- .lop_exist = llog_lvfs_exist,
- .lop_declare_create = llog_lvfs_declare_create,
- .lop_declare_write_rec = llog_lvfs_declare_write_rec,
-};
-EXPORT_SYMBOL(llog_lvfs_ops);
-#else /* !__KERNEL__ */
-struct llog_operations llog_lvfs_ops = {};
-#endif
git://git.whamcloud.com / fs / lustre-release.git / commitdiff