/*
* cfsd_logfile_destroy
*
* Description:
* Arguments:
* Returns:
* Preconditions:
*/
void
cfsd_logfile_destroy(cfsd_logfile_object_t *logfile_object_p)
{
dbug_enter("cfsd_logfile_destroy");
logfile_sync(logfile_object_p);
logfile_teardown(logfile_object_p);
cfsd_free(logfile_object_p);
dbug_leave("cfsd_logfile_destroy");
}
/*
* fscache_roll
*
* Description:
* Rolls the contents of the log to the server.
* Arguments:
* kmodp interface to kernel functions
* Returns:
* Returns 0 for success or ETIMEDOUT if a timeout error occurred.
* Preconditions:
* precond(kmodp)
*/
int
fscache_roll(cfsd_fscache_object_t *fscache_object_p,
cfsd_kmod_object_t *kmod_object_p)
{
int error = 0;
cfsd_logelem_object_t *logelem_object_p;
char namebuf[MAXPATHLEN];
char backupfile[MAXPATHLEN];
int xx;
cfs_dlog_entry_t *entp;
off_t next_offset;
ulong_t curseq = 0;
int eof = 0;
char *xp;
cfsd_logfile_object_t *logfile_object_p;
cfsd_maptbl_object_t *maptbl_object_p;
dbug_enter("fscache_roll");
dbug_precond(fscache_object_p);
dbug_precond(kmod_object_p);
/* map in the log file */
logfile_object_p = cfsd_logfile_create();
snprintf(namebuf, sizeof (namebuf), "%s/%s/%s",
fscache_object_p->i_cachepath, fscache_object_p->i_name,
CACHEFS_DLOG_FILE);
xx = logfile_setup(logfile_object_p, namebuf, CFS_DLOG_ENTRY_MAXSIZE);
if (xx) {
if (xx == ENOENT) {
cfsd_logfile_destroy(logfile_object_p);
dbug_leave("fscache_roll");
return (0);
}
fscache_fsproblem(fscache_object_p, kmod_object_p);
cfsd_logfile_destroy(logfile_object_p);
dbug_leave("fscache_roll");
return (0);
}
fscache_lock(fscache_object_p);
fscache_changes(fscache_object_p, 1);
fscache_unlock(fscache_object_p);
/* create a hashed mapping table for changes to cids */
maptbl_object_p = cfsd_maptbl_create();
snprintf(namebuf, sizeof (namebuf), "%s/%s/%s",
fscache_object_p->i_cachepath, fscache_object_p->i_name,
CACHEFS_DMAP_FILE);
xx = maptbl_setup(maptbl_object_p, namebuf);
if (xx) {
fscache_fsproblem(fscache_object_p, kmod_object_p);
cfsd_logfile_destroy(logfile_object_p);
cfsd_maptbl_destroy(maptbl_object_p);
dbug_leave("fscache_roll");
return (0);
}
/*
* lock is not needed because they are only used when
* rolling the log by fscache_roll and fscache_addagain
*/
fscache_object_p->i_again_offset = 0;
fscache_object_p->i_again_seq = 0;
/* Pass 1: collect all cid to fid mappings */
next_offset = LOGFILE_ENTRY_START;
for (;;) {
/* get a pointer to the next record */
xx = logfile_entry(logfile_object_p, next_offset, &entp);
if (xx == 1)
break;
if (xx == -1) {
fscache_fsproblem(fscache_object_p, kmod_object_p);
cfsd_logfile_destroy(logfile_object_p);
cfsd_maptbl_destroy(maptbl_object_p);
dbug_leave("fscache_roll");
return (0);
}
next_offset += entp->dl_len;
/* skip record if not valid */
if (entp->dl_valid != CFS_DLOG_VAL_COMMITTED)
continue;
/* create an object for the appropriate log type */
logelem_object_p = NULL;
switch (entp->dl_op) {
case CFS_DLOG_CREATE:
case CFS_DLOG_REMOVE:
case CFS_DLOG_LINK:
case CFS_DLOG_RENAME:
case CFS_DLOG_MKDIR:
case CFS_DLOG_RMDIR:
case CFS_DLOG_SYMLINK:
case CFS_DLOG_SETATTR:
case CFS_DLOG_SETSECATTR:
case CFS_DLOG_MODIFIED:
case CFS_DLOG_TRAILER:
break;
case CFS_DLOG_MAPFID:
dbug_print(("info", "mapfid"));
logelem_object_p = cfsd_logelem_mapfid_create(
maptbl_object_p, logfile_object_p,
kmod_object_p);
break;
default:
dbug_assert(0);
fscache_fsproblem(fscache_object_p, kmod_object_p);
break;
}
/* do not bother if ignoring the record */
if (logelem_object_p == NULL)
continue;
/* debuggging */
logelem_dump(logelem_object_p);
/* roll the entry */
xx = logelem_roll(logelem_object_p, (ulong_t *)NULL);
if (xx) {
fscache_fsproblem(fscache_object_p, kmod_object_p);
cfsd_logelem_destroy(logelem_object_p);
cfsd_maptbl_destroy(maptbl_object_p);
cfsd_logfile_destroy(logfile_object_p);
dbug_leave("fscache_roll");
return (0);
}
/* mark record as completed */
entp->dl_valid = CFS_DLOG_VAL_PROCESSED;
xx = logfile_sync(logfile_object_p);
if (xx) {
fscache_fsproblem(fscache_object_p, kmod_object_p);
cfsd_logelem_destroy(logelem_object_p);
cfsd_maptbl_destroy(maptbl_object_p);
cfsd_logfile_destroy(logfile_object_p);
dbug_leave("fscache_roll");
return (0);
}
/* destroy the object */
cfsd_logelem_destroy(logelem_object_p);
}
/* Pass 2: modify the back file system */
next_offset = LOGFILE_ENTRY_START;
for (;;) {
/* if we need the seq number of a deferred modify */
if (fscache_object_p->i_again_offset &&
(fscache_object_p->i_again_seq == 0)) {
/* get a pointer to the next record */
xx = logfile_entry(logfile_object_p,
fscache_object_p->i_again_offset, &entp);
if (xx == 1)
break;
if (xx == -1) {
fscache_fsproblem(fscache_object_p,
kmod_object_p);
cfsd_logfile_destroy(logfile_object_p);
cfsd_maptbl_destroy(maptbl_object_p);
dbug_leave("fscache_roll");
return (0);
}
dbug_assert(entp->dl_op == CFS_DLOG_MODIFIED);
fscache_object_p->i_again_seq = entp->dl_seq;
dbug_assert(fscache_object_p->i_again_seq != 0);
}
/* get a pointer to the next record to process */
if (!eof) {
xx = logfile_entry(logfile_object_p, next_offset,
&entp);
if (xx == 1) {
eof = 1;
curseq = ULONG_MAX;
} else if (xx) {
break;
} else {
curseq = entp->dl_seq;
}
}
/* if its time to process a deferred modify entry */
if (fscache_object_p->i_again_seq &&
(eof || (fscache_object_p->i_again_seq < entp->dl_seq))) {
xx = logfile_entry(logfile_object_p,
fscache_object_p->i_again_offset, &entp);
if (xx)
break;
dbug_assert(entp->dl_op == CFS_DLOG_MODIFIED);
curseq = entp->dl_seq;
fscache_object_p->i_again_offset =
entp->dl_u.dl_modify.dl_next;
fscache_object_p->i_again_seq = 0;
entp->dl_u.dl_modify.dl_next = -1;
} else if (eof) {
xx = 0;
break;
}
/* else move the offset to the next record */
else {
next_offset += entp->dl_len;
}
/* skip record if not valid */
if (entp->dl_valid != CFS_DLOG_VAL_COMMITTED)
continue;
/* process the record */
xx = fscache_rollone(fscache_object_p, kmod_object_p,
maptbl_object_p, logfile_object_p, curseq);
if (xx == ETIMEDOUT) {
/* timeout error, back to disconnected */
cfsd_maptbl_destroy(maptbl_object_p);
cfsd_logfile_destroy(logfile_object_p);
dbug_print(("info", "timeout error occurred"));
dbug_leave("fscache_roll");
return (xx);
} else if (xx == EIO) {
break;
} else if (xx == EAGAIN) {
continue;
} else if (xx) {
/* should never happen */
dbug_assert(0);
break;
} else {
/* mark record as completed */
entp->dl_valid = CFS_DLOG_VAL_PROCESSED;
xx = logfile_sync(logfile_object_p);
if (xx)
break;
}
}
/* if an unrecoverable error occurred */
if (xx) {
dbug_print(("error", "error processing log file"));
fscache_fsproblem(fscache_object_p, kmod_object_p);
}
/* dump stats about the hash table */
maptbl_dumpstats(maptbl_object_p);
/* dump stats about the log file */
logfile_dumpstats(logfile_object_p);
/* debugging hack, rename the log files */
if (snprintf(namebuf, sizeof (namebuf), "%s/%s/%s",
fscache_object_p->i_cachepath, fscache_object_p->i_name,
CACHEFS_DLOG_FILE) > ((sizeof (backupfile)) - (sizeof (".bak")))) {
dbug_print(("error", "unable to create backup dlog_file "
"for %s, path name is too long", namebuf));
} else {
/*
* No need to check return value from snprintf() as
* the previous check should suffice.
*/
snprintf(backupfile, sizeof (backupfile), "%s.bak", namebuf);
if (rename(namebuf, backupfile) == -1) {
dbug_print(("error",
"unable to create backup dlog_file"));
}
}
if (snprintf(namebuf, sizeof (namebuf), "%s/%s/%s",
fscache_object_p->i_cachepath, fscache_object_p->i_name,
CACHEFS_DMAP_FILE) > ((sizeof (backupfile)) - (sizeof (".bak")))) {
dbug_print(("error", "unable to create backup dmap_file "
"for %s, path name is too long", namebuf));
} else {
/*
* No need to check return value from snprintf() as
* the previous check should suffice.
*/
snprintf(backupfile, sizeof (backupfile), "%s.bak", namebuf);
if (rename(namebuf, backupfile) == -1) {
dbug_print(("error",
"unable to create backup dmap_file"));
}
}
/* delete the log file */
/* XXX */
cfsd_maptbl_destroy(maptbl_object_p);
cfsd_logfile_destroy(logfile_object_p);
dbug_leave("fscache_roll");
return (error);
}
