/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/mkdev.h>
#include <sys/stat.h>
#include <strings.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <fmd_module.h>
#include <fmd_error.h>
#include <fmd_alloc.h>
#include <fmd_case.h>
#include <fmd_serd.h>
#include <fmd_subr.h>
#include <fmd_conf.h>
#include <fmd_event.h>
#include <fmd_log.h>
#include <fmd_api.h>
#include <fmd_ckpt.h>
#include <fmd.h>
#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
#define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
/*
* The fmd_ckpt_t structure is used to manage all of the state needed by the
* various subroutines that save and restore checkpoints. The structure is
* initialized using fmd_ckpt_create() or fmd_ckpt_open() and is destroyed
* by fmd_ckpt_destroy(). Refer to the subroutines below for more details.
*/
typedef struct fmd_ckpt {
char ckp_src[PATH_MAX]; /* ckpt input or output filename */
char ckp_dst[PATH_MAX]; /* ckpt rename filename */
uchar_t *ckp_buf; /* data buffer base address */
fcf_hdr_t *ckp_hdr; /* file header pointer */
uchar_t *ckp_ptr; /* data buffer pointer */
size_t ckp_size; /* data buffer size */
fcf_sec_t *ckp_secp; /* section header table pointer */
fcf_sec_t *ckp_modp; /* section header for module */
uint_t ckp_secs; /* number of sections */
char *ckp_strs; /* string table base pointer */
char *ckp_strp; /* string table pointer */
size_t ckp_strn; /* string table size */
int ckp_fd; /* output descriptor */
fmd_module_t *ckp_mp; /* checkpoint module */
void *ckp_arg; /* private arg for callbacks */
} fmd_ckpt_t;
typedef struct fmd_ckpt_desc {
uint64_t secd_size; /* minimum section size */
uint32_t secd_entsize; /* minimum section entry size */
uint32_t secd_align; /* section alignment */
} fmd_ckpt_desc_t;
/*
* Table of FCF section descriptions. Here we record the minimum size for each
* section (for use during restore) and the expected entry size and alignment
* for each section (for use during both checkpoint and restore).
*/
static const fmd_ckpt_desc_t _fmd_ckpt_sections[] = {
{ 0, 0, sizeof (uint8_t) }, /* NONE */
{ 1, 0, sizeof (char) }, /* STRTAB */
{ sizeof (fcf_module_t), 0, sizeof (uint32_t) }, /* MODULE */
{ sizeof (fcf_case_t), 0, sizeof (uint32_t) }, /* CASE */
{ sizeof (fcf_buf_t), sizeof (fcf_buf_t), sizeof (uint32_t) }, /* BUFS */
{ 0, 0, _MAX_ALIGNMENT }, /* BUFFER */
{ sizeof (fcf_serd_t), sizeof (fcf_serd_t), sizeof (uint64_t) }, /* SERD */
{ sizeof (fcf_event_t), sizeof (fcf_event_t), sizeof (uint64_t) }, /* EVENTS */
{ sizeof (fcf_nvl_t), sizeof (fcf_nvl_t), sizeof (uint64_t) }, /* NVLISTS */
};
static int
fmd_ckpt_create(fmd_ckpt_t *ckp, fmd_module_t *mp)
{
const char *dir = mp->mod_ckpt;
const char *name = mp->mod_name;
mode_t mode;
bzero(ckp, sizeof (fmd_ckpt_t));
ckp->ckp_mp = mp;
ckp->ckp_size = sizeof (fcf_hdr_t);
ckp->ckp_strn = 1; /* for \0 */
(void) snprintf(ckp->ckp_src, PATH_MAX, "%s/%s+", dir, name);
(void) snprintf(ckp->ckp_dst, PATH_MAX, "%s/%s", dir, name);
(void) unlink(ckp->ckp_src);
(void) fmd_conf_getprop(fmd.d_conf, "ckpt.mode", &mode);
ckp->ckp_fd = open64(ckp->ckp_src, O_WRONLY | O_CREAT | O_EXCL, mode);
return (ckp->ckp_fd);
}
/*PRINTFLIKE2*/
static int
fmd_ckpt_inval(fmd_ckpt_t *ckp, const char *format, ...)
{
va_list ap;
va_start(ap, format);
fmd_verror(EFMD_CKPT_INVAL, format, ap);
va_end(ap);
fmd_free(ckp->ckp_buf, ckp->ckp_size);
return (fmd_set_errno(EFMD_CKPT_INVAL));
}
static int
fmd_ckpt_open(fmd_ckpt_t *ckp, fmd_module_t *mp)
{
struct stat64 st;
uint64_t seclen;
uint_t i;
int err;
bzero(ckp, sizeof (fmd_ckpt_t));
ckp->ckp_mp = mp;
(void) snprintf(ckp->ckp_src, PATH_MAX, "%s/%s",
mp->mod_ckpt, mp->mod_name);
if ((ckp->ckp_fd = open(ckp->ckp_src, O_RDONLY)) == -1)
return (-1); /* failed to open checkpoint file */
if (fstat64(ckp->ckp_fd, &st) == -1) {
err = errno;
(void) close(ckp->ckp_fd);
return (fmd_set_errno(err));
}
ckp->ckp_buf = fmd_alloc(st.st_size, FMD_SLEEP);
ckp->ckp_hdr = (void *)ckp->ckp_buf;
ckp->ckp_size = read(ckp->ckp_fd, ckp->ckp_buf, st.st_size);
if (ckp->ckp_size != st.st_size || ckp->ckp_size < sizeof (fcf_hdr_t) ||
ckp->ckp_size != ckp->ckp_hdr->fcfh_filesz) {
err = ckp->ckp_size == (size_t)-1L ? errno : EFMD_CKPT_SHORT;
fmd_free(ckp->ckp_buf, st.st_size);
(void) close(ckp->ckp_fd);
return (fmd_set_errno(err));
}
(void) close(ckp->ckp_fd);
ckp->ckp_fd = -1;
/*
* Once we've read in a consistent copy of the FCF file and we're sure
* the header can be accessed, go through it and make sure everything
* is valid. We also check that unused bits are zero so we can expand
* to use them safely in the future and support old files if needed.
*/
if (bcmp(&ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG0],
FCF_MAG_STRING, FCF_MAG_STRLEN) != 0)
return (fmd_ckpt_inval(ckp, "bad checkpoint magic string\n"));
if (ckp->ckp_hdr->fcfh_ident[FCF_ID_MODEL] != FCF_MODEL_NATIVE)
return (fmd_ckpt_inval(ckp, "bad checkpoint data model\n"));
if (ckp->ckp_hdr->fcfh_ident[FCF_ID_ENCODING] != FCF_ENCODE_NATIVE)
return (fmd_ckpt_inval(ckp, "bad checkpoint data encoding\n"));
if (ckp->ckp_hdr->fcfh_ident[FCF_ID_VERSION] != FCF_VERSION_1) {
return (fmd_ckpt_inval(ckp, "bad checkpoint version %u\n",
ckp->ckp_hdr->fcfh_ident[FCF_ID_VERSION]));
}
for (i = FCF_ID_PAD; i < FCF_ID_SIZE; i++) {
if (ckp->ckp_hdr->fcfh_ident[i] != 0) {
return (fmd_ckpt_inval(ckp,
"bad checkpoint padding at id[%d]", i));
}
}
if (ckp->ckp_hdr->fcfh_flags & ~FCF_FL_VALID)
return (fmd_ckpt_inval(ckp, "bad checkpoint flags\n"));
if (ckp->ckp_hdr->fcfh_pad != 0)
return (fmd_ckpt_inval(ckp, "reserved field in use\n"));
if (ckp->ckp_hdr->fcfh_hdrsize < sizeof (fcf_hdr_t) ||
ckp->ckp_hdr->fcfh_secsize < sizeof (fcf_sec_t)) {
return (fmd_ckpt_inval(ckp,
"bad header and/or section size\n"));
}
seclen = (uint64_t)ckp->ckp_hdr->fcfh_secnum *
(uint64_t)ckp->ckp_hdr->fcfh_secsize;
if (ckp->ckp_hdr->fcfh_secoff > ckp->ckp_size ||
seclen > ckp->ckp_size ||
ckp->ckp_hdr->fcfh_secoff + seclen > ckp->ckp_size ||
ckp->ckp_hdr->fcfh_secoff + seclen < ckp->ckp_hdr->fcfh_secoff)
return (fmd_ckpt_inval(ckp, "truncated section headers\n"));
if (!IS_P2ALIGNED(ckp->ckp_hdr->fcfh_secoff, sizeof (uint64_t)) ||
!IS_P2ALIGNED(ckp->ckp_hdr->fcfh_secsize, sizeof (uint64_t)))
return (fmd_ckpt_inval(ckp, "misaligned section headers\n"));
/*
* Once the header is validated, iterate over the section headers
* ensuring that each one is valid w.r.t. offset, alignment, and size.
* We also pick up the string table pointer during this pass.
*/
ckp->ckp_secp = (void *)(ckp->ckp_buf + ckp->ckp_hdr->fcfh_secoff);
ckp->ckp_secs = ckp->ckp_hdr->fcfh_secnum;
for (i = 0; i < ckp->ckp_secs; i++) {
fcf_sec_t *sp = (void *)(ckp->ckp_buf +
ckp->ckp_hdr->fcfh_secoff + ckp->ckp_hdr->fcfh_secsize * i);
const fmd_ckpt_desc_t *dp = &_fmd_ckpt_sections[sp->fcfs_type];
if (sp->fcfs_flags != 0) {
return (fmd_ckpt_inval(ckp, "section %u has invalid "
"section flags (0x%x)\n", i, sp->fcfs_flags));
}
if (sp->fcfs_align & (sp->fcfs_align - 1)) {
return (fmd_ckpt_inval(ckp, "section %u has invalid "
"alignment (%u)\n", i, sp->fcfs_align));
}
if (sp->fcfs_offset & (sp->fcfs_align - 1)) {
return (fmd_ckpt_inval(ckp, "section %u is not properly"
" aligned (offset %llu)\n", i, sp->fcfs_offset));
}
if (sp->fcfs_entsize != 0 &&
(sp->fcfs_entsize & (sp->fcfs_align - 1)) != 0) {
return (fmd_ckpt_inval(ckp, "section %u has misaligned "
"entsize %u\n", i, sp->fcfs_entsize));
}
if (sp->fcfs_offset > ckp->ckp_size ||
sp->fcfs_size > ckp->ckp_size ||
sp->fcfs_offset + sp->fcfs_size > ckp->ckp_size ||
sp->fcfs_offset + sp->fcfs_size < sp->fcfs_offset) {
return (fmd_ckpt_inval(ckp, "section %u has corrupt "
"size or offset\n", i));
}
if (sp->fcfs_type >= sizeof (_fmd_ckpt_sections) /
sizeof (_fmd_ckpt_sections[0])) {
return (fmd_ckpt_inval(ckp, "section %u has unknown "
"section type %u\n", i, sp->fcfs_type));
}
if (sp->fcfs_align != dp->secd_align) {
return (fmd_ckpt_inval(ckp, "section %u has align %u "
"(not %u)\n", i, sp->fcfs_align, dp->secd_align));
}
if (sp->fcfs_size < dp->secd_size ||
sp->fcfs_entsize < dp->secd_entsize) {
return (fmd_ckpt_inval(ckp, "section %u has short "
"size or entsize\n", i));
}
switch (sp->fcfs_type) {
case FCF_SECT_STRTAB:
if (ckp->ckp_strs != NULL) {
return (fmd_ckpt_inval(ckp, "multiple string "
"tables are present in checkpoint file\n"));
}
ckp->ckp_strs = (char *)ckp->ckp_buf + sp->fcfs_offset;
ckp->ckp_strn = sp->fcfs_size;
if (ckp->ckp_strs[ckp->ckp_strn - 1] != '\0') {
return (fmd_ckpt_inval(ckp, "string table %u "
"is missing terminating nul byte\n", i));
}
break;
case FCF_SECT_MODULE:
if (ckp->ckp_modp != NULL) {
return (fmd_ckpt_inval(ckp, "multiple module "
"sects are present in checkpoint file\n"));
}
ckp->ckp_modp = sp;
break;
}
}
/*
* Ensure that the first section is an empty one of type FCF_SECT_NONE.
* This is done to ensure that links can use index 0 as a null section.
*/
if (ckp->ckp_secs == 0 || ckp->ckp_secp->fcfs_type != FCF_SECT_NONE ||
ckp->ckp_secp->fcfs_entsize != 0 || ckp->ckp_secp->fcfs_size != 0) {
return (fmd_ckpt_inval(ckp, "section 0 is not of the "
"appropriate size and/or attributes (SECT_NONE)\n"));
}
if (ckp->ckp_modp == NULL) {
return (fmd_ckpt_inval(ckp,
"no module section found in file\n"));
}
return (0);
}
static void
fmd_ckpt_destroy(fmd_ckpt_t *ckp)
{
if (ckp->ckp_buf != NULL)
fmd_free(ckp->ckp_buf, ckp->ckp_size);
if (ckp->ckp_fd >= 0)
(void) close(ckp->ckp_fd);
}
/*
* fmd_ckpt_error() is used as a wrapper around fmd_error() for ckpt routines.
* It calls fmd_module_unlock() on behalf of its caller, logs the error, and
* then aborts the API call and the surrounding module entry point by doing an
* fmd_module_abort(), which longjmps to the place where we entered the module.
* Depending on the type of error and conf settings, we will reset or fail.
*/
/*PRINTFLIKE3*/
static void
fmd_ckpt_error(fmd_ckpt_t *ckp, int err, const char *format, ...)
{
fmd_module_t *mp = ckp->ckp_mp;
va_list ap;
va_start(ap, format);
fmd_verror(err, format, ap);
va_end(ap);
if (fmd_module_locked(mp))
fmd_module_unlock(mp);
fmd_ckpt_destroy(ckp);
fmd_module_abort(mp, err);
}
static fcf_secidx_t
fmd_ckpt_section(fmd_ckpt_t *ckp, const void *data, uint_t type, uint64_t size)
{
const fmd_ckpt_desc_t *dp;
ASSERT(type < sizeof (_fmd_ckpt_sections) / sizeof (fmd_ckpt_desc_t));
dp = &_fmd_ckpt_sections[type];
ckp->ckp_ptr = (uchar_t *)
P2ROUNDUP((uintptr_t)ckp->ckp_ptr, dp->secd_align);
ckp->ckp_secp->fcfs_type = type;
ckp->ckp_secp->fcfs_align = dp->secd_align;
ckp->ckp_secp->fcfs_flags = 0;
ckp->ckp_secp->fcfs_entsize = dp->secd_entsize;
ckp->ckp_secp->fcfs_offset = (size_t)(ckp->ckp_ptr - ckp->ckp_buf);
ckp->ckp_secp->fcfs_size = size;
/*
* If the data pointer is non-NULL, copy the data to our buffer; else
* the caller is responsible for doing so and updating ckp->ckp_ptr.
*/
if (data != NULL) {
bcopy(data, ckp->ckp_ptr, size);
ckp->ckp_ptr += size;
}
ckp->ckp_secp++;
return (ckp->ckp_secs++);
}
static fcf_stridx_t
fmd_ckpt_string(fmd_ckpt_t *ckp, const char *s)
{
fcf_stridx_t idx = (fcf_stridx_t)(ckp->ckp_strp - ckp->ckp_strs);
(void) strcpy(ckp->ckp_strp, s);
ckp->ckp_strp += strlen(s) + 1;
return (idx);
}
static int
fmd_ckpt_alloc(fmd_ckpt_t *ckp, uint64_t gen)
{
/*
* We've added up all the sections by now: add two more for SECT_NONE
* and SECT_STRTAB, and add the size of the section header table and
* string table to the total size. We know that the fcf_hdr_t is
* aligned so that that fcf_sec_t's can follow it, and that fcf_sec_t
* is aligned so that any section can follow it, so no extra padding
* bytes need to be allocated between any of these items.
*/
ckp->ckp_secs += 2; /* for FCF_SECT_NONE and FCF_SECT_STRTAB */
ckp->ckp_size += sizeof (fcf_sec_t) * ckp->ckp_secs;
ckp->ckp_size += ckp->ckp_strn;
TRACE((FMD_DBG_CKPT, "alloc fcf buf size %u", ckp->ckp_size));
ckp->ckp_buf = fmd_zalloc(ckp->ckp_size, FMD_NOSLEEP);
if (ckp->ckp_buf == NULL)
return (-1); /* errno is set for us */
ckp->ckp_hdr = (void *)ckp->ckp_buf;
ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG0] = FCF_MAG_MAG0;
ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG1] = FCF_MAG_MAG1;
ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG2] = FCF_MAG_MAG2;
ckp->ckp_hdr->fcfh_ident[FCF_ID_MAG3] = FCF_MAG_MAG3;
ckp->ckp_hdr->fcfh_ident[FCF_ID_MODEL] = FCF_MODEL_NATIVE;
ckp->ckp_hdr->fcfh_ident[FCF_ID_ENCODING] = FCF_ENCODE_NATIVE;
ckp->ckp_hdr->fcfh_ident[FCF_ID_VERSION] = FCF_VERSION;
ckp->ckp_hdr->fcfh_hdrsize = sizeof (fcf_hdr_t);
ckp->ckp_hdr->fcfh_secsize = sizeof (fcf_sec_t);
ckp->ckp_hdr->fcfh_secnum = ckp->ckp_secs;
ckp->ckp_hdr->fcfh_secoff = sizeof (fcf_hdr_t);
ckp->ckp_hdr->fcfh_filesz = ckp->ckp_size;
ckp->ckp_hdr->fcfh_cgen = gen;
ckp->ckp_secs = 0; /* reset section counter for second pass */
ckp->ckp_secp = (void *)(ckp->ckp_buf + sizeof (fcf_hdr_t));
ckp->ckp_strs = (char *)ckp->ckp_buf + ckp->ckp_size - ckp->ckp_strn;
ckp->ckp_strp = ckp->ckp_strs + 1; /* use first byte as \0 */
ckp->ckp_ptr = (uchar_t *)(ckp->ckp_secp + ckp->ckp_hdr->fcfh_secnum);
(void) fmd_ckpt_section(ckp, NULL, FCF_SECT_NONE, 0);
return (0);
}
static int
fmd_ckpt_commit(fmd_ckpt_t *ckp)
{
fcf_sec_t *secbase = (void *)(ckp->ckp_buf + sizeof (fcf_hdr_t));
size_t stroff = ckp->ckp_size - ckp->ckp_strn;
/*
* Before committing the checkpoint, we assert that fmd_ckpt_t's sizes
* and current pointer locations all add up appropriately. Any ASSERTs
* which trip here likely indicate an inconsistency in the code for the
* reservation pass and the buffer update pass of the FCF subroutines.
*/
ASSERT((size_t)(ckp->ckp_ptr - ckp->ckp_buf) == stroff);
(void) fmd_ckpt_section(ckp, NULL, FCF_SECT_STRTAB, ckp->ckp_strn);
ckp->ckp_ptr += ckp->ckp_strn; /* string table is already filled in */
ASSERT(ckp->ckp_secs == ckp->ckp_hdr->fcfh_secnum);
ASSERT(ckp->ckp_secp == secbase + ckp->ckp_hdr->fcfh_secnum);
ASSERT(ckp->ckp_ptr == ckp->ckp_buf + ckp->ckp_hdr->fcfh_filesz);
if (write(ckp->ckp_fd, ckp->ckp_buf, ckp->ckp_size) != ckp->ckp_size ||
fsync(ckp->ckp_fd) != 0 || close(ckp->ckp_fd) != 0)
return (-1); /* errno is set for us */
ckp->ckp_fd = -1; /* fd is now closed */
return (rename(ckp->ckp_src, ckp->ckp_dst) != 0);
}
static void
fmd_ckpt_resv(fmd_ckpt_t *ckp, size_t size, size_t align)
{
if (size != 0) {
ckp->ckp_size = P2ROUNDUP(ckp->ckp_size, align) + size;
ckp->ckp_secs++;
}
}
static void
fmd_ckpt_resv_buf(fmd_buf_t *bp, fmd_ckpt_t *ckp)
{
ckp->ckp_size = P2ROUNDUP(ckp->ckp_size, _MAX_ALIGNMENT) + bp->buf_size;
ckp->ckp_strn += strlen(bp->buf_name) + 1;
ckp->ckp_secs++;
}
static void
fmd_ckpt_save_buf(fmd_buf_t *bp, fmd_ckpt_t *ckp)
{
fcf_buf_t *fcfb = ckp->ckp_arg;
fcfb->fcfb_name = fmd_ckpt_string(ckp, bp->buf_name);
fcfb->fcfb_data = fmd_ckpt_section(ckp,
bp->buf_data, FCF_SECT_BUFFER, bp->buf_size);
ckp->ckp_arg = fcfb + 1;
}
static void
fmd_ckpt_save_event(fmd_ckpt_t *ckp, fmd_event_t *e)
{
fcf_event_t *fcfe = (void *)ckp->ckp_ptr;
fmd_event_impl_t *ep = (fmd_event_impl_t *)e;
fmd_log_t *lp = ep->ev_log;
fcfe->fcfe_todsec = ep->ev_time.ftv_sec;
fcfe->fcfe_todnsec = ep->ev_time.ftv_nsec;
fcfe->fcfe_major = lp ? major(lp->log_stat.st_dev) : -1U;
fcfe->fcfe_minor = lp ? minor(lp->log_stat.st_dev) : -1U;
fcfe->fcfe_inode = lp ? lp->log_stat.st_ino : -1ULL;
fcfe->fcfe_offset = ep->ev_off;
ckp->ckp_ptr += sizeof (fcf_event_t);
}
static void
fmd_ckpt_save_nvlist(fmd_ckpt_t *ckp, nvlist_t *nvl)
{
fcf_nvl_t *fcfn = (void *)ckp->ckp_ptr;
char *nvbuf = (char *)ckp->ckp_ptr + sizeof (fcf_nvl_t);
size_t nvsize = 0;
(void) nvlist_size(nvl, &nvsize, NV_ENCODE_NATIVE);
fcfn->fcfn_size = (uint64_t)nvsize;
(void) nvlist_pack(nvl, &nvbuf, &nvsize, NV_ENCODE_NATIVE, 0);
ckp->ckp_ptr += sizeof (fcf_nvl_t) + nvsize;
ckp->ckp_ptr = (uchar_t *)
P2ROUNDUP((uintptr_t)ckp->ckp_ptr, sizeof (uint64_t));
}
static void
fmd_ckpt_resv_serd(fmd_serd_eng_t *sgp, fmd_ckpt_t *ckp)
{
fmd_ckpt_resv(ckp,
sizeof (fcf_event_t) * sgp->sg_count, sizeof (uint64_t));
ckp->ckp_strn += strlen(sgp->sg_name) + 1;
}
static void
fmd_ckpt_save_serd(fmd_serd_eng_t *sgp, fmd_ckpt_t *ckp)
{
fcf_serd_t *fcfd = ckp->ckp_arg;
fcf_secidx_t evsec = FCF_SECT_NONE;
fmd_serd_elem_t *sep;
if (sgp->sg_count != 0) {
evsec = fmd_ckpt_section(ckp, NULL, FCF_SECT_EVENTS,
sizeof (fcf_event_t) * sgp->sg_count);
for (sep = fmd_list_next(&sgp->sg_list);
sep != NULL; sep = fmd_list_next(sep))
fmd_ckpt_save_event(ckp, sep->se_event);
}
fcfd->fcfd_name = fmd_ckpt_string(ckp, sgp->sg_name);
fcfd->fcfd_events = evsec;
fcfd->fcfd_pad = 0;
fcfd->fcfd_n = sgp->sg_n;
fcfd->fcfd_t = sgp->sg_t;
ckp->ckp_arg = fcfd + 1;
}
static void
fmd_ckpt_resv_case(fmd_ckpt_t *ckp, fmd_case_t *cp)
{
fmd_case_impl_t *cip = (fmd_case_impl_t *)cp;
fmd_case_susp_t *cis;
uint_t n;
if (cip->ci_xprt != NULL)
return; /* do not checkpoint cases from remote transports */
n = fmd_buf_hash_count(&cip->ci_bufs);
fmd_buf_hash_apply(&cip->ci_bufs, (fmd_buf_f *)fmd_ckpt_resv_buf, ckp);
fmd_ckpt_resv(ckp, sizeof (fcf_buf_t) * n, sizeof (uint32_t));
if (cip->ci_principal != NULL)
fmd_ckpt_resv(ckp, sizeof (fcf_event_t), sizeof (uint64_t));
fmd_ckpt_resv(ckp,
sizeof (fcf_event_t) * cip->ci_nitems, sizeof (uint64_t));
if (cip->ci_nsuspects != 0)
ckp->ckp_size = P2ROUNDUP(ckp->ckp_size, sizeof (uint64_t));
cip->ci_nvsz = 0; /* compute size of packed suspect nvlist array */
for (cis = cip->ci_suspects; cis != NULL; cis = cis->cis_next) {
size_t nvsize = 0;
(void) nvlist_size(cis->cis_nvl, &nvsize, NV_ENCODE_NATIVE);
cip->ci_nvsz += sizeof (fcf_nvl_t) + nvsize;
cip->ci_nvsz = P2ROUNDUP(cip->ci_nvsz, sizeof (uint64_t));
}
fmd_ckpt_resv(ckp, cip->ci_nvsz, sizeof (uint64_t));
fmd_ckpt_resv(ckp, sizeof (fcf_case_t), sizeof (uint32_t));
ckp->ckp_strn += strlen(cip->ci_uuid) + 1;
}
static void
fmd_ckpt_save_case(fmd_ckpt_t *ckp, fmd_case_t *cp)
{
fmd_case_impl_t *cip = (fmd_case_impl_t *)cp;
fmd_case_item_t *cit;
fmd_case_susp_t *cis;
fcf_case_t fcfc;
uint_t n;
fcf_secidx_t bufsec = FCF_SECIDX_NONE;
fcf_secidx_t evsec = FCF_SECIDX_NONE;
fcf_secidx_t nvsec = FCF_SECIDX_NONE;
fcf_secidx_t prsec = FCF_SECIDX_NONE;
if (cip->ci_xprt != NULL)
return; /* do not checkpoint cases from remote transports */
if ((n = fmd_buf_hash_count(&cip->ci_bufs)) != 0) {
size_t size = sizeof (fcf_buf_t) * n;
fcf_buf_t *bufs = ckp->ckp_arg = fmd_alloc(size, FMD_SLEEP);
fmd_buf_hash_apply(&cip->ci_bufs,
(fmd_buf_f *)fmd_ckpt_save_buf, ckp);
bufsec = fmd_ckpt_section(ckp, bufs, FCF_SECT_BUFS, size);
fmd_free(bufs, size);
}
if (cip->ci_principal != NULL) {
prsec = fmd_ckpt_section(ckp, NULL, FCF_SECT_EVENTS,
sizeof (fcf_event_t));
fmd_ckpt_save_event(ckp, cip->ci_principal);
}
if (cip->ci_nitems != 0) {
evsec = fmd_ckpt_section(ckp, NULL, FCF_SECT_EVENTS,
sizeof (fcf_event_t) * cip->ci_nitems);
for (cit = cip->ci_items; cit != NULL; cit = cit->cit_next)
fmd_ckpt_save_event(ckp, cit->cit_event);
}
if (cip->ci_nsuspects != 0) {
nvsec = fmd_ckpt_section(ckp, NULL,
FCF_SECT_NVLISTS, cip->ci_nvsz);
for (cis = cip->ci_suspects; cis != NULL; cis = cis->cis_next)
fmd_ckpt_save_nvlist(ckp, cis->cis_nvl);
}
fcfc.fcfc_uuid = fmd_ckpt_string(ckp, cip->ci_uuid);
fcfc.fcfc_bufs = bufsec;
fcfc.fcfc_principal = prsec;
fcfc.fcfc_events = evsec;
fcfc.fcfc_suspects = nvsec;
switch (cip->ci_state) {
case FMD_CASE_UNSOLVED:
fcfc.fcfc_state = FCF_CASE_UNSOLVED;
break;
case FMD_CASE_SOLVED:
fcfc.fcfc_state = FCF_CASE_SOLVED;
break;
case FMD_CASE_CLOSE_WAIT:
fcfc.fcfc_state = FCF_CASE_CLOSE_WAIT;
break;
default:
fmd_panic("case %p (%s) has invalid state %u",
(void *)cp, cip->ci_uuid, cip->ci_state);
}
(void) fmd_ckpt_section(ckp, &fcfc, FCF_SECT_CASE, sizeof (fcf_case_t));
}
static void
fmd_ckpt_resv_module(fmd_ckpt_t *ckp, fmd_module_t *mp)
{
fmd_case_t *cp;
uint_t n;
for (cp = fmd_list_next(&mp->mod_cases); cp; cp = fmd_list_next(cp))
fmd_ckpt_resv_case(ckp, cp);
n = fmd_serd_hash_count(&mp->mod_serds);
fmd_serd_hash_apply(&mp->mod_serds,
(fmd_serd_eng_f *)fmd_ckpt_resv_serd, ckp);
fmd_ckpt_resv(ckp, sizeof (fcf_serd_t) * n, sizeof (uint64_t));
n = fmd_buf_hash_count(&mp->mod_bufs);
fmd_buf_hash_apply(&mp->mod_bufs, (fmd_buf_f *)fmd_ckpt_resv_buf, ckp);
fmd_ckpt_resv(ckp, sizeof (fcf_buf_t) * n, sizeof (uint32_t));
fmd_ckpt_resv(ckp, sizeof (fcf_module_t), sizeof (uint32_t));
ckp->ckp_strn += strlen(mp->mod_name) + 1;
ckp->ckp_strn += strlen(mp->mod_path) + 1;
ckp->ckp_strn += strlen(mp->mod_info->fmdi_desc) + 1;
ckp->ckp_strn += strlen(mp->mod_info->fmdi_vers) + 1;
}
static void
fmd_ckpt_save_module(fmd_ckpt_t *ckp, fmd_module_t *mp)
{
fcf_secidx_t bufsec = FCF_SECIDX_NONE;
fcf_module_t fcfm;
fmd_case_t *cp;
uint_t n;
for (cp = fmd_list_next(&mp->mod_cases); cp; cp = fmd_list_next(cp))
fmd_ckpt_save_case(ckp, cp);
if ((n = fmd_serd_hash_count(&mp->mod_serds)) != 0) {
size_t size = sizeof (fcf_serd_t) * n;
fcf_serd_t *serds = ckp->ckp_arg = fmd_alloc(size, FMD_SLEEP);
fmd_serd_hash_apply(&mp->mod_serds,
(fmd_serd_eng_f *)fmd_ckpt_save_serd, ckp);
(void) fmd_ckpt_section(ckp, serds, FCF_SECT_SERD, size);
fmd_free(serds, size);
}
if ((n = fmd_buf_hash_count(&mp->mod_bufs)) != 0) {
size_t size = sizeof (fcf_buf_t) * n;
fcf_buf_t *bufs = ckp->ckp_arg = fmd_alloc(size, FMD_SLEEP);
fmd_buf_hash_apply(&mp->mod_bufs,
(fmd_buf_f *)fmd_ckpt_save_buf, ckp);
bufsec = fmd_ckpt_section(ckp, bufs, FCF_SECT_BUFS, size);
fmd_free(bufs, size);
}
fcfm.fcfm_name = fmd_ckpt_string(ckp, mp->mod_name);
fcfm.fcfm_path = fmd_ckpt_string(ckp, mp->mod_path);
fcfm.fcfm_desc = fmd_ckpt_string(ckp, mp->mod_info->fmdi_desc);
fcfm.fcfm_vers = fmd_ckpt_string(ckp, mp->mod_info->fmdi_vers);
fcfm.fcfm_bufs = bufsec;
(void) fmd_ckpt_section(ckp, &fcfm,
FCF_SECT_MODULE, sizeof (fcf_module_t));
}
void
fmd_ckpt_save(fmd_module_t *mp)
{
struct stat64 st;
char path[PATH_MAX];
mode_t dirmode;
hrtime_t now = gethrtime();
fmd_ckpt_t ckp;
int err;
ASSERT(fmd_module_locked(mp));
/*
* If checkpointing is disabled for the module, just return. We must
* commit the module state anyway to transition pending log events.
*/
if (mp->mod_stats->ms_ckpt_save.fmds_value.bool == FMD_B_FALSE) {
fmd_module_commit(mp);
return;
}
if (!(mp->mod_flags & (FMD_MOD_MDIRTY | FMD_MOD_CDIRTY)))
return; /* no checkpoint is necessary for this module */
TRACE((FMD_DBG_CKPT, "ckpt save begin %s %llu",
mp->mod_name, mp->mod_gen + 1));
/*
* If the per-module checkpoint directory isn't found or isn't of type
* directory, move aside whatever is there (if anything) and attempt
* to mkdir(2) a new module checkpoint directory. If this fails, we
* have no choice but to abort the checkpoint and try again later.
*/
if (stat64(mp->mod_ckpt, &st) != 0 || !S_ISDIR(st.st_mode)) {
(void) snprintf(path, sizeof (path), "%s-", mp->mod_ckpt);
(void) rename(mp->mod_ckpt, path);
(void) fmd_conf_getprop(fmd.d_conf, "ckpt.dirmode", &dirmode);
if (mkdir(mp->mod_ckpt, dirmode) != 0) {
fmd_error(EFMD_CKPT_MKDIR,
"failed to mkdir %s", mp->mod_ckpt);
return; /* return without clearing dirty bits */
}
}
/*
* Create a temporary file to write out the checkpoint into, and create
* a fmd_ckpt_t structure to manage construction of the checkpoint. We
* then figure out how much space will be required, and allocate it.
*/
if (fmd_ckpt_create(&ckp, mp) == -1) {
fmd_error(EFMD_CKPT_CREATE, "failed to create %s", ckp.ckp_src);
return;
}
fmd_ckpt_resv_module(&ckp, mp);
if (fmd_ckpt_alloc(&ckp, mp->mod_gen + 1) != 0) {
fmd_error(EFMD_CKPT_NOMEM, "failed to build %s", ckp.ckp_src);
fmd_ckpt_destroy(&ckp);
return;
}
/*
* Fill in the checkpoint content, write it to disk, sync it, and then
* atomically rename it to the destination path. If this fails, we
* have no choice but to leave all our dirty bits set and return.
*/
fmd_ckpt_save_module(&ckp, mp);
err = fmd_ckpt_commit(&ckp);
fmd_ckpt_destroy(&ckp);
if (err != 0) {
fmd_error(EFMD_CKPT_COMMIT, "failed to commit %s", ckp.ckp_dst);
return; /* return without clearing dirty bits */
}
fmd_module_commit(mp);
TRACE((FMD_DBG_CKPT, "ckpt save end %s", mp->mod_name));
mp->mod_stats->ms_ckpt_cnt.fmds_value.ui64++;
mp->mod_stats->ms_ckpt_time.fmds_value.ui64 += gethrtime() - now;
fmd_dprintf(FMD_DBG_CKPT, "saved checkpoint of %s (%llu)\n",
mp->mod_name, mp->mod_gen);
}
/*
* Utility function to retrieve a pointer to a section's header and verify that
* it is of the expected type or it is a FCF_SECT_NONE reference.
*/
static const fcf_sec_t *
fmd_ckpt_secptr(fmd_ckpt_t *ckp, fcf_secidx_t sid, uint_t type)
{
const fcf_sec_t *sp = (void *)(ckp->ckp_buf +
ckp->ckp_hdr->fcfh_secoff + ckp->ckp_hdr->fcfh_secsize * sid);
return (sid < ckp->ckp_secs && (sp->fcfs_type == type ||
sp->fcfs_type == FCF_SECT_NONE) ? sp : NULL);
}
/*
* Utility function to retrieve the data pointer for a particular section. The
* validity of the header values has already been checked by fmd_ckpt_open().
*/
static const void *
fmd_ckpt_dataptr(fmd_ckpt_t *ckp, const fcf_sec_t *sp)
{
return (ckp->ckp_buf + sp->fcfs_offset);
}
/*
* Utility function to retrieve the end of the data region for a particular
* section. The validity of this value has been confirmed by fmd_ckpt_open().
*/
static const void *
fmd_ckpt_datalim(fmd_ckpt_t *ckp, const fcf_sec_t *sp)
{
return (ckp->ckp_buf + sp->fcfs_offset + sp->fcfs_size);
}
/*
* Utility function to retrieve a string pointer (fcf_stridx_t). If the string
* index is valid, the string data is returned; otherwise 'defstr' is returned.
*/
static const char *
fmd_ckpt_strptr(fmd_ckpt_t *ckp, fcf_stridx_t sid, const char *defstr)
{
return (sid < ckp->ckp_strn ? ckp->ckp_strs + sid : defstr);
}
static void
fmd_ckpt_restore_events(fmd_ckpt_t *ckp, fcf_secidx_t sid,
void (*func)(void *, fmd_event_t *), void *arg)
{
const fcf_event_t *fcfe;
const fcf_sec_t *sp;
fmd_timeval_t ftv;
fmd_log_t *lp, *errlp;
uint_t i, n;
uint32_t e_maj, e_min;
uint64_t e_ino;
if ((sp = fmd_ckpt_secptr(ckp, sid, FCF_SECT_EVENTS)) == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"invalid link to section %u: expected events\n", sid);
}
if (sp->fcfs_size == 0)
return; /* empty events section or type none */
fcfe = fmd_ckpt_dataptr(ckp, sp);
n = sp->fcfs_size / sp->fcfs_entsize;
/*
* Hold the reader lock on log pointers to block log rotation during
* the section restore so that we can safely insert refs to d_errlog.
*/
(void) pthread_rwlock_rdlock(&fmd.d_log_lock);
errlp = fmd.d_errlog;
e_maj = major(errlp->log_stat.st_dev);
e_min = minor(errlp->log_stat.st_dev);
e_ino = errlp->log_stat.st_ino;
for (i = 0; i < n; i++) {
fmd_event_t *ep;
ftv.ftv_sec = fcfe->fcfe_todsec;
ftv.ftv_nsec = fcfe->fcfe_todnsec;
if (e_ino == fcfe->fcfe_inode &&
e_maj == fcfe->fcfe_major &&
e_min == fcfe->fcfe_minor)
lp = errlp;
else
lp = NULL;
ep = fmd_event_recreate(FMD_EVT_PROTOCOL,
&ftv, NULL, NULL, lp, fcfe->fcfe_offset, 0);
fmd_event_hold(ep);
func(arg, ep);
fmd_event_rele(ep);
fcfe = (fcf_event_t *)((uintptr_t)fcfe + sp->fcfs_entsize);
}
(void) pthread_rwlock_unlock(&fmd.d_log_lock);
}
static int
fmd_ckpt_restore_suspects(fmd_ckpt_t *ckp, fmd_case_t *cp, fcf_secidx_t sid)
{
const fcf_nvl_t *fcfn, *endn;
const fcf_sec_t *sp;
nvlist_t *nvl;
int err, i;
if ((sp = fmd_ckpt_secptr(ckp, sid, FCF_SECT_NVLISTS)) == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"invalid link to section %u: expected nvlists\n", sid);
}
fcfn = fmd_ckpt_dataptr(ckp, sp);
endn = fmd_ckpt_datalim(ckp, sp);
for (i = 0; fcfn < endn; i++) {
char *data = (char *)fcfn + sp->fcfs_entsize;
size_t size = (size_t)fcfn->fcfn_size;
if (fcfn->fcfn_size > (size_t)((char *)endn - data)) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL, "nvlist %u [%d] "
"size %u exceeds buffer\n", sid, i, size);
}
if ((err = nvlist_xunpack(data, size, &nvl, &fmd.d_nva)) != 0) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL, "failed to "
"unpack nvlist %u [%d]: %s\n", sid, i,
fmd_strerror(err));
}
fmd_case_insert_suspect(cp, nvl);
size = sp->fcfs_entsize + fcfn->fcfn_size;
size = P2ROUNDUP(size, sizeof (uint64_t));
fcfn = (fcf_nvl_t *)((uintptr_t)fcfn + size);
}
return (i);
}
static void
fmd_ckpt_restore_bufs(fmd_ckpt_t *ckp, fmd_module_t *mp,
fmd_case_t *cp, fcf_secidx_t sid)
{
const fcf_sec_t *sp, *dsp;
const fcf_buf_t *fcfb;
uint_t i, n;
if ((sp = fmd_ckpt_secptr(ckp, sid, FCF_SECT_BUFS)) == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"invalid link to section %u: expected bufs\n", sid);
}
if (sp->fcfs_size == 0)
return; /* empty events section or type none */
fcfb = fmd_ckpt_dataptr(ckp, sp);
n = sp->fcfs_size / sp->fcfs_entsize;
for (i = 0; i < n; i++) {
dsp = fmd_ckpt_secptr(ckp, fcfb->fcfb_data, FCF_SECT_BUFFER);
if (dsp == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL, "invalid %u "
"buffer link %u\n", sid, fcfb->fcfb_data);
}
fmd_buf_write((fmd_hdl_t *)mp, cp,
fmd_ckpt_strptr(ckp, fcfb->fcfb_name, "<CORRUPT>"),
ckp->ckp_buf + dsp->fcfs_offset, dsp->fcfs_size);
fcfb = (fcf_buf_t *)((uintptr_t)fcfb + sp->fcfs_entsize);
}
}
static void
fmd_ckpt_restore_case(fmd_ckpt_t *ckp, fmd_module_t *mp, const fcf_sec_t *sp)
{
const fcf_case_t *fcfc = fmd_ckpt_dataptr(ckp, sp);
const char *uuid = fmd_ckpt_strptr(ckp, fcfc->fcfc_uuid, NULL);
fmd_case_t *cp;
int n;
if (uuid == NULL || fcfc->fcfc_state > FCF_CASE_CLOSE_WAIT) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL, "corrupt %u case uuid "
"and/or state\n", (uint_t)(sp - ckp->ckp_secp));
}
fmd_module_lock(mp);
if ((cp = fmd_case_recreate(mp, NULL,
fcfc->fcfc_state != FCF_CASE_UNSOLVED ? FCF_CASE_SOLVED :
FMD_CASE_UNSOLVED, uuid, NULL)) == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"duplicate case uuid: %s\n", uuid);
}
fmd_ckpt_restore_events(ckp, fcfc->fcfc_principal,
(void (*)(void *, fmd_event_t *))fmd_case_insert_principal, cp);
fmd_ckpt_restore_events(ckp, fcfc->fcfc_events,
(void (*)(void *, fmd_event_t *))fmd_case_insert_event, cp);
/*
* Once solved, treat suspects from resource cache as master copy.
*
* If !fmd.d_running, this module must be a builtin, and so we don't
* want to restore suspects or call fmd_case_transition_update() at this
* stage. The suspects will be added later from the resource cache.
* Calling fmd_case_transition("SOLVED") is OK here as the state is
* already solved, so all it does is update the case flags.
*/
if (fmd.d_running && (n = ((fmd_case_impl_t *)cp)->ci_nsuspects) == 0)
n = fmd_ckpt_restore_suspects(ckp, cp, fcfc->fcfc_suspects);
if (!fmd.d_running)
fmd_case_transition(cp, FMD_CASE_SOLVED, FMD_CF_SOLVED);
else if (fcfc->fcfc_state == FCF_CASE_SOLVED)
fmd_case_transition_update(cp, FMD_CASE_SOLVED, FMD_CF_SOLVED);
else if (fcfc->fcfc_state == FCF_CASE_CLOSE_WAIT && n != 0)
fmd_case_transition(cp, FMD_CASE_CLOSE_WAIT, FMD_CF_SOLVED);
else if (fcfc->fcfc_state == FCF_CASE_CLOSE_WAIT && n == 0)
fmd_case_transition(cp, FMD_CASE_CLOSE_WAIT, 0);
fmd_module_unlock(mp);
fmd_ckpt_restore_bufs(ckp, mp, cp, fcfc->fcfc_bufs);
}
static void
fmd_ckpt_restore_serd(fmd_ckpt_t *ckp, fmd_module_t *mp, const fcf_sec_t *sp)
{
const fcf_serd_t *fcfd = fmd_ckpt_dataptr(ckp, sp);
uint_t i, n = sp->fcfs_size / sp->fcfs_entsize;
const fcf_sec_t *esp;
const char *s;
for (i = 0; i < n; i++) {
esp = fmd_ckpt_secptr(ckp, fcfd->fcfd_events, FCF_SECT_EVENTS);
if (esp == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"invalid events link %u\n", fcfd->fcfd_events);
}
if ((s = fmd_ckpt_strptr(ckp, fcfd->fcfd_name, NULL)) == NULL) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"serd name %u is corrupt\n", fcfd->fcfd_name);
}
fmd_serd_create((fmd_hdl_t *)mp, s, fcfd->fcfd_n, fcfd->fcfd_t);
fmd_module_lock(mp);
fmd_ckpt_restore_events(ckp, fcfd->fcfd_events,
(void (*)(void *, fmd_event_t *))fmd_serd_eng_record,
fmd_serd_eng_lookup(&mp->mod_serds, s));
fmd_module_unlock(mp);
fcfd = (fcf_serd_t *)((uintptr_t)fcfd + sp->fcfs_entsize);
}
}
static void
fmd_ckpt_restore_module(fmd_ckpt_t *ckp, fmd_module_t *mp)
{
const fcf_module_t *fcfm = fmd_ckpt_dataptr(ckp, ckp->ckp_modp);
const fcf_sec_t *sp;
uint_t i;
if (strcmp(mp->mod_name, fmd_ckpt_strptr(ckp, fcfm->fcfm_name, "")) ||
strcmp(mp->mod_path, fmd_ckpt_strptr(ckp, fcfm->fcfm_path, ""))) {
fmd_ckpt_error(ckp, EFMD_CKPT_INVAL,
"checkpoint is not for module %s\n", mp->mod_name);
}
for (i = 0; i < ckp->ckp_secs; i++) {
sp = (void *)(ckp->ckp_buf +
ckp->ckp_hdr->fcfh_secoff + ckp->ckp_hdr->fcfh_secsize * i);
switch (sp->fcfs_type) {
case FCF_SECT_CASE:
fmd_ckpt_restore_case(ckp, mp, sp);
break;
case FCF_SECT_SERD:
fmd_ckpt_restore_serd(ckp, mp, sp);
break;
}
}
fmd_ckpt_restore_bufs(ckp, mp, NULL, fcfm->fcfm_bufs);
mp->mod_gen = ckp->ckp_hdr->fcfh_cgen;
}
/*
* Restore a checkpoint for the specified module. Any errors which occur
* during restore will call fmd_ckpt_error() or trigger an fmd_api_error(),
* either of which will automatically unlock the module and trigger an abort.
*/
void
fmd_ckpt_restore(fmd_module_t *mp)
{
fmd_ckpt_t ckp;
if (mp->mod_stats->ms_ckpt_restore.fmds_value.bool == FMD_B_FALSE)
return; /* never restore checkpoints for this module */
TRACE((FMD_DBG_CKPT, "ckpt restore begin %s", mp->mod_name));
if (fmd_ckpt_open(&ckp, mp) == -1) {
if (errno != ENOENT)
fmd_error(EFMD_CKPT_OPEN, "can't open %s", ckp.ckp_src);
TRACE((FMD_DBG_CKPT, "ckpt restore end %s", mp->mod_name));
return;
}
ASSERT(!fmd_module_locked(mp));
fmd_ckpt_restore_module(&ckp, mp);
fmd_ckpt_destroy(&ckp);
fmd_module_clrdirty(mp);
TRACE((FMD_DBG_CKPT, "ckpt restore end %s", mp->mod_name));
fmd_dprintf(FMD_DBG_CKPT, "restored checkpoint of %s\n", mp->mod_name);
}
/*
* Delete the module's checkpoint file. This is used by the ckpt.zero property
* code or by the fmadm reset RPC service path to force a checkpoint delete.
*/
void
fmd_ckpt_delete(fmd_module_t *mp)
{
char path[PATH_MAX];
(void) snprintf(path, sizeof (path),
"%s/%s", mp->mod_ckpt, mp->mod_name);
TRACE((FMD_DBG_CKPT, "delete %s ckpt", mp->mod_name));
if (unlink(path) != 0 && errno != ENOENT)
fmd_error(EFMD_CKPT_DELETE, "failed to delete %s", path);
}
/*
* Move aside the module's checkpoint file if checkpoint restore has failed.
* We rename the file rather than deleting it in the hopes that someone might
* send it to us for post-mortem analysis of whether we have a checkpoint bug.
*/
void
fmd_ckpt_rename(fmd_module_t *mp)
{
char src[PATH_MAX], dst[PATH_MAX];
(void) snprintf(src, sizeof (src), "%s/%s", mp->mod_ckpt, mp->mod_name);
(void) snprintf(dst, sizeof (dst), "%s-", src);
TRACE((FMD_DBG_CKPT, "rename %s ckpt", mp->mod_name));
if (rename(src, dst) != 0 && errno != ENOENT)
fmd_error(EFMD_CKPT_DELETE, "failed to rename %s", src);
}