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/*
Copyright (c) 2015 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.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <ctype.h>
#include <sys/uio.h>
#include "glusterfs.h"
#include "xlator.h"
#include "logging.h"
#include "bit-rot.h"
#include "bit-rot-scrub.h"
#include <pthread.h>
static inline int32_t
bitd_fetch_signature (xlator_t *this,
br_child_t *child, fd_t *fd, br_isignature_out_t *sign)
{
int32_t ret = -1;
dict_t *xattr = NULL;
br_isignature_out_t *sigptr = NULL;
ret = syncop_fgetxattr (child->xl, fd, &xattr,
GLUSTERFS_GET_OBJECT_SIGNATURE, NULL);
if (ret < 0) {
br_log_object (this, "getxattr", fd->inode->gfid, -ret);
goto out;
}
ret = dict_get_ptr (xattr, GLUSTERFS_GET_OBJECT_SIGNATURE,
(void **)&sigptr);
if (ret) {
gf_log (this->name, GF_LOG_ERROR,
"failed to extract signature info [GFID: %s]",
uuid_utoa (fd->inode->gfid));
goto unref_dict;
}
ret = 0;
(void) memcpy (sign, sigptr, sizeof (br_isignature_out_t));
unref_dict:
dict_unref (xattr);
out:
return ret;
}
static inline int32_t
bitd_scrub_post_compute_check (xlator_t *this,
br_child_t *child,
br_isignature_out_t *sign, fd_t *fd)
{
int32_t ret = 0;
ret = bitd_fetch_signature (this, child, fd, sign);
if (ret)
goto out;
if (sign->stale)
ret = -1;
out:
return ret;
}
static inline int32_t
bitd_scrub_pre_compute_check (xlator_t *this, br_child_t *child, fd_t *fd)
{
int32_t ret = -1;
br_isignature_out_t sign = {0,};
/* if the object is already marked bad, don't bother checking */
if (bitd_is_bad_file (this, child, NULL, fd))
goto out;
/* else, check for signature staleness */
ret = bitd_fetch_signature (this, child, fd, &sign);
if (ret)
goto out;
if (sign.stale) {
ret = -1;
goto out;
}
ret = 0;
out:
return ret;
}
static inline int
bitd_compare_ckum (xlator_t *this,
br_isignature_out_t *sign,
unsigned char *md, inode_t *linked_inode,
gf_dirent_t *entry, fd_t *fd, br_child_t *child)
{
int ret = -1;
dict_t xattr = {0,};
GF_VALIDATE_OR_GOTO ("bit-rot", this, out);
GF_VALIDATE_OR_GOTO (this->name, sign, out);
GF_VALIDATE_OR_GOTO (this->name, fd, out);
GF_VALIDATE_OR_GOTO (this->name, child, out);
GF_VALIDATE_OR_GOTO (this->name, linked_inode, out);
GF_VALIDATE_OR_GOTO (this->name, md, out);
GF_VALIDATE_OR_GOTO (this->name, entry, out);
if (strncmp (sign->signature, (char *)md, strlen (sign->signature))) {
gf_log (this->name, GF_LOG_WARNING, "checksums does not match "
"for the entry %s (gfid: %s)", entry->d_name,
uuid_utoa (linked_inode->gfid));
ret = dict_set_int32 (&xattr, "trusted.glusterfs.bad-file",
_gf_true);
if (ret) {
gf_log (this->name, GF_LOG_ERROR, "dict-set for "
"bad-file (entry: %s, gfid: %s) failed",
entry->d_name, uuid_utoa (linked_inode->gfid));
goto out;
}
ret = syncop_fsetxattr (child->xl, fd, &xattr, 0);
if (ret) {
gf_log (this->name, GF_LOG_ERROR, "setxattr to mark "
"the file %s (gfid: %s) as bad failed",
entry->d_name, uuid_utoa (linked_inode->gfid));
goto out;
}
}
out:
return ret;
}
/**
* This is the scrubber. As of now there's a mix of fd and inode
* operations. Better to move them to fd based to be clean and
* avoid code cluttering.
*/
int
bitd_start_scrub (xlator_t *subvol,
gf_dirent_t *entry, loc_t *parent, void *data)
{
int32_t ret = -1;
fd_t *fd = NULL;
loc_t loc = {0, };
struct iatt iatt = {0, };
struct iatt parent_buf = {0, };
pid_t pid = 0;
br_child_t *child = NULL;
xlator_t *this = NULL;
unsigned char *md = NULL;
inode_t *linked_inode = NULL;
br_isignature_out_t sign = {0,};
GF_VALIDATE_OR_GOTO ("bit-rot", subvol, out);
GF_VALIDATE_OR_GOTO ("bit-rot", data, out);
child = data;
this = child->this;
pid = GF_CLIENT_PID_SCRUB;
ret = br_prepare_loc (this, child, parent, entry, &loc);
if (!ret)
goto out;
syncopctx_setfspid (&pid);
ret = syncop_lookup (child->xl, &loc, NULL, &iatt, NULL, &parent_buf);
if (ret) {
br_log_object_path (this, "lookup", loc.path, -ret);
goto out;
}
linked_inode = inode_link (loc.inode, parent->inode, loc.name, &iatt);
if (linked_inode)
inode_lookup (linked_inode);
if (iatt.ia_type != IA_IFREG) {
gf_log (this->name, GF_LOG_DEBUG, "%s is not a regular "
"file", entry->d_name);
ret = 0;
goto unref_inode;
}
/**
* open() an fd for subsequent opertaions
*/
fd = fd_create (linked_inode, 0);
if (!fd) {
gf_log (this->name, GF_LOG_ERROR, "failed to create fd for "
"inode %s", uuid_utoa (linked_inode->gfid));
goto unref_inode;
}
ret = syncop_open (child->xl, &loc, O_RDWR, fd);
if (ret) {
br_log_object (this, "open", linked_inode->gfid, -ret);
ret = -1;
goto unrefd;
}
fd_bind (fd);
/**
* perform pre compute checks before initiating checksum
* computation
* - presence of bad object
* - signature staleness
*/
ret = bitd_scrub_pre_compute_check (this, child, fd);
if (ret)
goto unrefd; /* skip this object */
/* if all's good, proceed to calculate the hash */
md = GF_CALLOC (SHA256_DIGEST_LENGTH, sizeof (*md),
gf_common_mt_char);
if (!md)
goto unrefd;
ret = br_calculate_obj_checksum (md, child, fd, &iatt);
if (ret) {
gf_log (this->name, GF_LOG_ERROR, "error calculating hash "
"for object [GFID: %s]", uuid_utoa (fd->inode->gfid));
ret = -1;
goto free_md;
}
/**
* perform post compute checks as an object's signature may have
* become stale while scrubber calculated checksum.
*/
ret = bitd_scrub_post_compute_check (this, child, &sign, fd);
if (ret)
goto free_md;
ret = bitd_compare_ckum (this, &sign, md,
linked_inode, entry, fd, child);
/** fd_unref() takes care of closing fd.. like syncop_close() */
free_md:
GF_FREE (md);
unrefd:
fd_unref (fd);
unref_inode:
inode_unref (linked_inode);
out:
loc_wipe (&loc);
return ret;
}
#define BR_SCRUB_THROTTLE_COUNT 10
#define BR_SCRUB_THROTTLE_ZZZ 100
void *
br_scrubber (void *arg)
{
loc_t loc = {0,};
xlator_t *this = NULL;
br_child_t *child = NULL;
child = arg;
this = child->this;
THIS = this;
loc.inode = child->table->root;
while (1) {
(void) syncop_ftw_throttle
(child->xl, &loc,
GF_CLIENT_PID_SCRUB, child, bitd_start_scrub,
BR_SCRUB_THROTTLE_COUNT, BR_SCRUB_THROTTLE_ZZZ);
sleep (BR_SCRUB_THROTTLE_ZZZ * BR_SCRUB_THROTTLE_COUNT);
}
return NULL;
}
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