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|
/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <unistd.h>
#include <pthread.h>
#include "uuid.h"
#include "globals.h"
#include "glusterfs.h"
#include "gf-changelog-helpers.h"
/* from the changelog translator */
#include "changelog-misc.h"
extern int byebye;
/**
* number of gfid records after fop number
*/
int nr_gfids[] = {
[GF_FOP_MKNOD] = 1,
[GF_FOP_MKDIR] = 1,
[GF_FOP_UNLINK] = 1,
[GF_FOP_RMDIR] = 1,
[GF_FOP_SYMLINK] = 1,
[GF_FOP_RENAME] = 2,
[GF_FOP_LINK] = 1,
[GF_FOP_CREATE] = 1,
};
int nr_extra_recs[] = {
[GF_FOP_MKNOD] = 3,
[GF_FOP_MKDIR] = 3,
[GF_FOP_UNLINK] = 0,
[GF_FOP_RMDIR] = 0,
[GF_FOP_SYMLINK] = 0,
[GF_FOP_RENAME] = 0,
[GF_FOP_LINK] = 0,
[GF_FOP_CREATE] = 3,
};
static char *
binary_to_ascii (uuid_t uuid)
{
return uuid_utoa (uuid);
}
static char *
conv_noop (char *ptr) { return ptr; }
#define VERIFY_SEPARATOR(ptr, plen, perr) \
{ \
if (*(ptr + plen) != '\0') { \
perr = 1; \
break; \
} \
}
#define MOVER_MOVE(mover, nleft, bytes) \
{ \
mover += bytes; \
nleft -= bytes; \
} \
#define PARSE_GFID(mov, ptr, le, fn, perr) \
{ \
VERIFY_SEPARATOR (mov, le, perr); \
ptr = fn (mov); \
if (!ptr) { \
perr = 1; \
break; \
} \
}
#define FILL_AND_MOVE(pt, buf, of, mo, nl, le) \
{ \
GF_CHANGELOG_FILL_BUFFER (pt, buf, of, strlen (pt)); \
MOVER_MOVE (mo, nl, le); \
}
#define PARSE_GFID_MOVE(ptr, uuid, mover, nleft, perr) \
{ \
memcpy (uuid, mover, sizeof (uuid_t)); \
ptr = binary_to_ascii (uuid); \
if (!ptr) { \
perr = 1; \
break; \
} \
MOVER_MOVE (mover, nleft, sizeof (uuid_t)); \
} \
#define LINE_BUFSIZE 3*PATH_MAX /* enough buffer for extra chars too */
/**
* using mmap() makes parsing easy. fgets() cannot be used here as
* the binary gfid could contain a line-feed (0x0A), in that case fgets()
* would read an incomplete line and parsing would fail. using POSIX fds
* would result is additional code to maintain state in case of partial
* reads of data (where multiple entries do not fit extirely in the buffer).
*
* mmap() gives the flexibility of pointing to an offset in the file
* without us worrying about reading it in memory (VM does that for us for
* free).
*/
static int
gf_changelog_parse_binary (xlator_t *this,
gf_changelog_t *gfc, int from_fd, int to_fd,
size_t start_offset, struct stat *stbuf)
{
int ret = -1;
off_t off = 0;
off_t nleft = 0;
uuid_t uuid = {0,};
char *ptr = NULL;
char *bname_start = NULL;
char *bname_end = NULL;
char *mover = NULL;
char *start = NULL;
char current_mover = ' ';
size_t blen = 0;
int parse_err = 0;
char ascii[LINE_BUFSIZE] = {0,};
nleft = stbuf->st_size;
start = (char *) mmap (NULL, nleft,
PROT_READ, MAP_PRIVATE, from_fd, 0);
if (!start) {
gf_log (this->name, GF_LOG_ERROR,
"mmap() error (reason: %s)", strerror (errno));
goto out;
}
mover = start;
MOVER_MOVE (mover, nleft, start_offset);
while (nleft > 0) {
off = blen = 0;
ptr = bname_start = bname_end = NULL;
current_mover = *mover;
switch (current_mover) {
case 'D':
case 'M':
MOVER_MOVE (mover, nleft, 1);
PARSE_GFID_MOVE (ptr, uuid, mover, nleft, parse_err);
break;
case 'E':
MOVER_MOVE (mover, nleft, 1);
PARSE_GFID_MOVE (ptr, uuid, mover, nleft, parse_err);
bname_start = mover;
if ( (bname_end = strchr (mover, '\n')) == NULL ) {
parse_err = 1;
break;
}
blen = bname_end - bname_start;
MOVER_MOVE (mover, nleft, blen);
break;
default:
parse_err = 1;
}
if (parse_err)
break;
GF_CHANGELOG_FILL_BUFFER (¤t_mover, ascii, off, 1);
GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
GF_CHANGELOG_FILL_BUFFER (ptr, ascii, off, strlen (ptr));
if (blen)
GF_CHANGELOG_FILL_BUFFER (bname_start,
ascii, off, blen);
GF_CHANGELOG_FILL_BUFFER ("\n", ascii, off, 1);
if (gf_changelog_write (to_fd, ascii, off) != off) {
gf_log (this->name, GF_LOG_ERROR,
"processing binary changelog failed due to "
" error in writing ascii change (reason: %s)",
strerror (errno));
break;
}
MOVER_MOVE (mover, nleft, 1);
}
if ( (nleft == 0) && (!parse_err))
ret = 0;
if (munmap (start, stbuf->st_size))
gf_log (this->name, GF_LOG_ERROR,
"munmap() error (reason: %s)", strerror (errno));
out:
return ret;
}
/**
* ascii decoder:
* - separate out one entry from another
* - use fop name rather than fop number
*/
static int
gf_changelog_parse_ascii (xlator_t *this,
gf_changelog_t *gfc, int from_fd, int to_fd,
size_t start_offset, struct stat *stbuf)
{
int ng = 0;
int ret = -1;
int fop = 0;
int len = 0;
off_t off = 0;
off_t nleft = 0;
char *ptr = NULL;
char *eptr = NULL;
char *start = NULL;
char *mover = NULL;
int parse_err = 0;
char current_mover = ' ';
char ascii[LINE_BUFSIZE] = {0,};
const char *fopname = NULL;
nleft = stbuf->st_size;
start = (char *) mmap (NULL, nleft,
PROT_READ, MAP_PRIVATE, from_fd, 0);
if (!start) {
gf_log (this->name, GF_LOG_ERROR,
"mmap() error (reason: %s)", strerror (errno));
goto out;
}
mover = start;
MOVER_MOVE (mover, nleft, start_offset);
while (nleft > 0) {
off = 0;
current_mover = *mover;
GF_CHANGELOG_FILL_BUFFER (¤t_mover, ascii, off, 1);
GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
switch (current_mover) {
case 'D':
MOVER_MOVE (mover, nleft, 1);
/* target gfid */
PARSE_GFID (mover, ptr, UUID_CANONICAL_FORM_LEN,
conv_noop, parse_err);
FILL_AND_MOVE(ptr, ascii, off,
mover, nleft, UUID_CANONICAL_FORM_LEN);
break;
case 'M':
MOVER_MOVE (mover, nleft, 1);
/* target gfid */
PARSE_GFID (mover, ptr, UUID_CANONICAL_FORM_LEN,
conv_noop, parse_err);
FILL_AND_MOVE (ptr, ascii, off,
mover, nleft, UUID_CANONICAL_FORM_LEN);
FILL_AND_MOVE (" ", ascii, off, mover, nleft, 1);
/* fop */
len = strlen (mover);
VERIFY_SEPARATOR (mover, len, parse_err);
fop = atoi (mover);
if ( (fopname = gf_fop_list[fop]) == NULL) {
parse_err = 1;
break;
}
MOVER_MOVE (mover, nleft, len);
len = strlen (fopname);
GF_CHANGELOG_FILL_BUFFER (fopname, ascii, off, len);
break;
case 'E':
MOVER_MOVE (mover, nleft, 1);
/* target gfid */
PARSE_GFID (mover, ptr, UUID_CANONICAL_FORM_LEN,
conv_noop, parse_err);
FILL_AND_MOVE (ptr, ascii, off,
mover, nleft, UUID_CANONICAL_FORM_LEN);
FILL_AND_MOVE (" ", ascii, off,
mover, nleft, 1);
/* fop */
len = strlen (mover);
VERIFY_SEPARATOR (mover, len, parse_err);
fop = atoi (mover);
if ( (fopname = gf_fop_list[fop]) == NULL) {
parse_err = 1;
break;
}
MOVER_MOVE (mover, nleft, len);
len = strlen (fopname);
GF_CHANGELOG_FILL_BUFFER (fopname, ascii, off, len);
ng = nr_extra_recs[fop];
for (;ng > 0; ng--) {
MOVER_MOVE (mover, nleft, 1);
len = strlen (mover);
VERIFY_SEPARATOR (mover, len, parse_err);
GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
FILL_AND_MOVE (mover, ascii,
off, mover, nleft, len);
}
/* pargfid + bname */
ng = nr_gfids[fop];
while (ng-- > 0) {
MOVER_MOVE (mover, nleft, 1);
len = strlen (mover);
GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
PARSE_GFID (mover, ptr, len,
conv_noop, parse_err);
eptr = calloc (3, strlen (ptr));
if (!eptr) {
parse_err = 1;
break;
}
gf_rfc3986_encode ((unsigned char *) ptr,
eptr, gfc->rfc3986);
FILL_AND_MOVE (eptr, ascii, off,
mover, nleft, len);
free (eptr);
}
break;
default:
parse_err = 1;
}
if (parse_err)
break;
GF_CHANGELOG_FILL_BUFFER ("\n", ascii, off, 1);
if (gf_changelog_write (to_fd, ascii, off) != off) {
gf_log (this->name, GF_LOG_ERROR,
"processing ascii changelog failed due to "
" error in writing change (reason: %s)",
strerror (errno));
break;
}
MOVER_MOVE (mover, nleft, 1);
}
if ( (nleft == 0) && (!parse_err))
ret = 0;
if (munmap (start, stbuf->st_size))
gf_log (this->name, GF_LOG_ERROR,
"munmap() error (reason: %s)", strerror (errno));
out:
return ret;
}
#define COPY_BUFSIZE 8192
static int
gf_changelog_copy (xlator_t *this, int from_fd, int to_fd)
{
ssize_t size = 0;
char buffer[COPY_BUFSIZE+1] = {0,};
while (1) {
size = read (from_fd, buffer, COPY_BUFSIZE);
if (size <= 0)
break;
if (gf_changelog_write (to_fd,
buffer, size) != size) {
gf_log (this->name, GF_LOG_ERROR,
"error processing ascii changlog");
size = -1;
break;
}
}
return (size < 0 ? -1 : 0);
}
static int
gf_changelog_decode (xlator_t *this, gf_changelog_t *gfc, int from_fd,
int to_fd, struct stat *stbuf, int *zerob)
{
int ret = -1;
int encoding = -1;
size_t elen = 0;
char buffer[1024] = {0,};
CHANGELOG_GET_ENCODING (from_fd, buffer, 1024, encoding, elen);
if (encoding == -1) /* unknown encoding */
goto out;
if (!CHANGELOG_VALID_ENCODING (encoding))
goto out;
if (elen == stbuf->st_size) {
*zerob = 1;
goto out;
}
/**
* start processing after the header
*/
lseek (from_fd, elen, SEEK_SET);
switch (encoding) {
case CHANGELOG_ENCODE_BINARY:
/**
* this ideally should have been a part of changelog-encoders.c
* (ie. part of the changelog translator).
*/
ret = gf_changelog_parse_binary (this, gfc, from_fd,
to_fd, elen, stbuf);
break;
case CHANGELOG_ENCODE_ASCII:
ret = gf_changelog_parse_ascii (this, gfc, from_fd,
to_fd, elen, stbuf);
break;
default:
ret = gf_changelog_copy (this, from_fd, to_fd);
}
out:
return ret;
}
int
gf_changelog_publish (xlator_t *this, gf_changelog_t *gfc, char *from_path)
{
int ret = 0;
char dest[PATH_MAX] = {0,};
char to_path[PATH_MAX] = {0,};
struct stat stbuf = {0,};
(void) snprintf (to_path, PATH_MAX, "%s%s",
gfc->gfc_current_dir, basename (from_path));
/* handle zerob file that wont exist in current */
ret = stat (from_path, &stbuf);
if (ret)
goto out;
if (stbuf.st_size == 0) {
ret = unlink (from_path);
if (ret)
gf_log (this->name, GF_LOG_ERROR,
"could not unlink %s (reason %s)",
from_path, strerror (errno));
goto out;
}
(void) snprintf (dest, PATH_MAX, "%s%s",
gfc->gfc_processing_dir, basename (from_path));
ret = rename (to_path, dest);
if (ret){
gf_log (this->name, GF_LOG_ERROR,
"error moving %s to processing dir"
" (reason: %s)", to_path, strerror (errno));
}
out:
return ret;
}
int
gf_changelog_consume (xlator_t *this,
gf_changelog_t *gfc,
char *from_path, gf_boolean_t no_publish)
{
int ret = -1;
int fd1 = 0;
int fd2 = 0;
int zerob = 0;
struct stat stbuf = {0,};
char dest[PATH_MAX] = {0,};
char to_path[PATH_MAX] = {0,};
ret = stat (from_path, &stbuf);
if (ret || !S_ISREG(stbuf.st_mode)) {
ret = -1;
gf_log (this->name, GF_LOG_ERROR,
"stat failed on changelog file: %s", from_path);
goto out;
}
fd1 = open (from_path, O_RDONLY);
if (fd1 < 0) {
gf_log (this->name, GF_LOG_ERROR,
"cannot open changelog file: %s (reason: %s)",
from_path, strerror (errno));
goto out;
}
(void) snprintf (to_path, PATH_MAX, "%s%s",
gfc->gfc_current_dir, basename (from_path));
(void) snprintf (dest, PATH_MAX, "%s%s",
gfc->gfc_processing_dir, basename (from_path));
fd2 = open (to_path, O_CREAT | O_TRUNC | O_RDWR,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (fd2 < 0) {
gf_log (this->name, GF_LOG_ERROR,
"cannot create ascii changelog file %s (reason %s)",
to_path, strerror (errno));
goto close_fd;
} else {
ret = gf_changelog_decode (this, gfc, fd1,
fd2, &stbuf, &zerob);
close (fd2);
if (!ret) {
/* move it to processing on a successfull
decode */
if (no_publish == _gf_true)
goto close_fd;
ret = rename (to_path, dest);
if (ret)
gf_log (this->name, GF_LOG_ERROR,
"error moving %s to processing dir"
" (reason: %s)", to_path,
strerror (errno));
}
/* remove it from .current if it's an empty file */
if (zerob) {
if (no_publish == _gf_true) {
ret = 0;
goto close_fd;
}
ret = unlink (to_path);
if (ret)
gf_log (this->name, GF_LOG_ERROR,
"could not unlink %s (reason: %s)",
to_path, strerror (errno));
}
}
close_fd:
close (fd1);
out:
return ret;
}
static char *
gf_changelog_ext_change (xlator_t *this,
gf_changelog_t *gfc, char *path, size_t readlen)
{
int alo = 0;
int ret = 0;
size_t len = 0;
char *buf = NULL;
buf = path;
while (len < readlen) {
if (*buf == '\0') {
alo = 1;
gf_log (this->name, GF_LOG_DEBUG,
"processing changelog: %s", path);
ret = gf_changelog_consume (this, gfc, path, _gf_false);
}
if (ret)
break;
len++; buf++;
if (alo) {
alo = 0;
path = buf;
}
}
return (ret) ? NULL : path;
}
void *
gf_changelog_process (void *data)
{
ssize_t len = 0;
ssize_t offlen = 0;
xlator_t *this = NULL;
char *sbuf = NULL;
gf_changelog_t *gfc = NULL;
char from_path[PATH_MAX] = {0,};
gfc = (gf_changelog_t *) data;
this = gfc->this;
pthread_detach (pthread_self());
for (;;) {
len = gf_changelog_read_path (gfc->gfc_sockfd,
from_path + offlen,
PATH_MAX - offlen);
if (len < 0)
continue; /* ignore it for now */
if (len == 0) { /* close() from the changelog translator */
gf_log (this->name, GF_LOG_INFO, "close from changelog"
" notification translator.");
if (gfc->gfc_connretries != 1) {
if (!gf_changelog_notification_init(this, gfc))
continue;
}
byebye = 1;
break;
}
len += offlen;
sbuf = gf_changelog_ext_change (this, gfc, from_path, len);
if (!sbuf) {
gf_log (this->name, GF_LOG_ERROR,
"could not extract changelog filename");
continue;
}
offlen = 0;
if (sbuf != (from_path + len)) {
offlen = from_path + len - sbuf;
memmove (from_path, sbuf, offlen);
}
}
gf_log (this->name, GF_LOG_DEBUG,
"byebye (%d) from processing thread...", byebye);
return NULL;
}
|
