diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/llog_lvfs.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/obdclass/llog_lvfs.c | 862 |
1 files changed, 862 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/llog_lvfs.c b/drivers/staging/lustre/lustre/obdclass/llog_lvfs.c new file mode 100644 index 000000000000..7e12dc62141f --- /dev/null +++ b/drivers/staging/lustre/lustre/obdclass/llog_lvfs.c @@ -0,0 +1,862 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, 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 + + +#include <obd.h> +#include <obd_class.h> +#include <lustre_log.h> +#include <obd_ost.h> +#include <linux/list.h> +#include <lvfs.h> +#include <lustre_fsfilt.h> +#include <lustre_disk.h> +#include "llog_internal.h" + +#if 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 = ll_vfs_unlink(inode, fdentry, mnt); + 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 |