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/*
Copyright (c) 2017 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 "common-utils.h"
#include "xlator.h"
#include "syscall.h"
#include "logging.h"
#include "posix-messages.h"
#include "posix-mem-types.h"
#include "posix-gfid-path.h"
#include "posix.h"
int32_t
posix_set_gfid2path_xattr (xlator_t *this, const char *path, uuid_t pgfid,
const char *bname)
{
char xxh64[GF_XXH64_DIGEST_LENGTH*2+1] = {0,};
char pgfid_bname[1024] = {0,};
char *key = NULL;
char *val = NULL;
size_t key_size = 0;
size_t val_size = 0;
int ret = 0;
GF_VALIDATE_OR_GOTO ("posix", this, err);
snprintf (pgfid_bname, sizeof (pgfid_bname), "%s/%s", uuid_utoa (pgfid),
bname);
gf_xxh64_wrapper ((unsigned char *) pgfid_bname,
strlen(pgfid_bname), GF_XXHSUM64_DEFAULT_SEED, xxh64);
key_size = GFID2PATH_XATTR_KEY_PREFIX_LENGTH +
GF_XXH64_DIGEST_LENGTH*2 + 1;
key = alloca (key_size);
snprintf (key, key_size, GFID2PATH_XATTR_KEY_PREFIX"%s", xxh64);
val_size = UUID_CANONICAL_FORM_LEN + NAME_MAX + 2;
val = alloca (val_size);
snprintf (val, val_size, "%s/%s", uuid_utoa (pgfid), bname);
ret = sys_lsetxattr (path, key, val, strlen(val), XATTR_CREATE);
if (ret == -1) {
gf_msg (this->name, GF_LOG_WARNING, errno, P_MSG_PGFID_OP,
"setting gfid2path xattr failed on %s: key = %s ",
path, key);
goto err;
}
return 0;
err:
return -1;
}
int32_t
posix_remove_gfid2path_xattr (xlator_t *this, const char *path,
uuid_t pgfid, const char *bname)
{
char xxh64[GF_XXH64_DIGEST_LENGTH*2+1] = {0,};
char pgfid_bname[1024] = {0,};
int ret = 0;
char *key = NULL;
size_t key_size = 0;
GF_VALIDATE_OR_GOTO ("posix", this, err);
snprintf (pgfid_bname, sizeof (pgfid_bname), "%s/%s", uuid_utoa (pgfid),
bname);
gf_xxh64_wrapper ((unsigned char *) pgfid_bname,
strlen(pgfid_bname), GF_XXHSUM64_DEFAULT_SEED, xxh64);
key_size = GFID2PATH_XATTR_KEY_PREFIX_LENGTH +
GF_XXH64_DIGEST_LENGTH*2 + 1;
key = alloca (key_size);
snprintf (key, key_size, GFID2PATH_XATTR_KEY_PREFIX"%s", xxh64);
ret = sys_lremovexattr (path, key);
if (ret == -1) {
gf_msg (this->name, GF_LOG_WARNING, errno, P_MSG_PGFID_OP,
"removing gfid2path xattr failed on %s: key = %s",
path, key);
goto err;
}
return 0;
err:
return -1;
}
gf_boolean_t
posix_is_gfid2path_xattr (const char *name)
{
if (name && strncmp (GFID2PATH_XATTR_KEY_PREFIX, name,
GFID2PATH_XATTR_KEY_PREFIX_LENGTH) == 0) {
return _gf_true;
} else {
return _gf_false;
}
}
static int gf_posix_xattr_enotsup_log;
int32_t
posix_get_gfid2path (xlator_t *this, inode_t *inode, const char *real_path,
int *op_errno, dict_t *dict)
{
int ret = 0;
char *path = NULL;
ssize_t size = 0;
char *list = NULL;
int32_t list_offset = 0;
int32_t i = 0;
int32_t j = 0;
char *paths[MAX_GFID2PATH_LINK_SUP] = {NULL,};
char *value = NULL;
size_t remaining_size = 0;
size_t bytes = 0;
char keybuffer[4096] = {0,};
char value_buf[8192] = {0,};
uuid_t pargfid = {0,};
gf_boolean_t have_val = _gf_false;
struct posix_private *priv = NULL;
char pargfid_str[UUID_CANONICAL_FORM_LEN + 1] = {0,};
gf_boolean_t found = _gf_false;
priv = this->private;
if (IA_ISDIR (inode->ia_type)) {
ret = posix_resolve_dirgfid_to_path (inode->gfid,
priv->base_path,
NULL, &path);
if (ret < 0) {
ret = -1;
goto err;
}
ret = dict_set_dynstr (dict, GFID2PATH_VIRT_XATTR_KEY, path);
if (ret < 0) {
gf_msg (this->name, GF_LOG_WARNING, -ret,
P_MSG_DICT_SET_FAILED, "could not set "
"value for key (%s)", GFID2PATH_VIRT_XATTR_KEY);
goto err;
}
found = _gf_true;
} else {
have_val = _gf_false;
memset (value_buf, '\0', sizeof(value_buf));
size = sys_llistxattr (real_path, value_buf,
sizeof (value_buf) - 1);
if (size > 0) {
have_val = _gf_true;
} else {
if (errno == ERANGE) {
gf_msg (this->name, GF_LOG_DEBUG, errno,
P_MSG_XATTR_FAILED,
"listxattr failed due to overflow of"
" buffer on %s ", real_path);
size = sys_llistxattr (real_path, NULL, 0);
}
if (size == -1) {
*op_errno = errno;
if ((errno == ENOTSUP) || (errno == ENOSYS)) {
GF_LOG_OCCASIONALLY (
gf_posix_xattr_enotsup_log,
this->name, GF_LOG_WARNING,
"Extended attributes not "
"supported (try remounting"
" brick with 'user_xattr' "
"flag)");
} else {
gf_msg (this->name, GF_LOG_ERROR, errno,
P_MSG_XATTR_FAILED,
"listxattr failed on %s",
real_path);
}
goto err;
}
if (size == 0)
goto done;
}
list = alloca (size);
if (!list) {
*op_errno = errno;
goto err;
}
if (have_val) {
memcpy (list, value_buf, size);
} else {
size = sys_llistxattr (real_path, list, size);
if (size < 0) {
ret = -1;
*op_errno = errno;
goto err;
}
}
remaining_size = size;
list_offset = 0;
while (remaining_size > 0) {
strncpy (keybuffer, list + list_offset,
sizeof(keybuffer));
if (!posix_is_gfid2path_xattr (keybuffer)) {
goto ignore;
}
found = _gf_true;
memset (value_buf, '\0', sizeof(value_buf));
size = sys_lgetxattr (real_path, keybuffer, value_buf,
sizeof (value_buf) - 1);
if (size == -1) {
ret = -1;
*op_errno = errno;
gf_msg (this->name, GF_LOG_ERROR, errno,
P_MSG_XATTR_FAILED, "getxattr failed on"
" %s: key = %s ", real_path, keybuffer);
break;
}
/* Parse pargfid from xattr value*/
strncpy (pargfid_str, value_buf, 36);
pargfid_str[36] = '\0';
gf_uuid_parse (pargfid_str, pargfid);
/* Convert pargfid to path */
ret = posix_resolve_dirgfid_to_path (pargfid,
priv->base_path,
&value_buf[37],
&paths[i]);
i++;
ignore:
remaining_size -= strlen (keybuffer) + 1;
list_offset += strlen (keybuffer) + 1;
} /* while (remaining_size > 0) */
/* gfid2path xattr is absent in the list of xattrs */
if (!found) {
ret = -1;
/*
* ENODATA because xattr is not present in the
* list of xattrs. Thus the consumer should
* face error instead of a success and a empty
* string in the dict for the key.
*/
*op_errno = ENODATA;
goto err;
}
/*
* gfid2path xattr is found in list of xattrs, but getxattr
* on the 1st gfid2path xattr itself failed and the while
* loop above broke. So there is nothing in the value. So
* it would be better not to send "" as the value for any
* key, as it is not true.
*/
if (found && !i)
goto err; /* both errno and ret are set before beak */
/* Calculate memory to be allocated */
for (j = 0; j < i; j++) {
bytes += strlen(paths[j]);
if (j < i-1)
bytes += strlen(priv->gfid2path_sep);
}
value = GF_CALLOC (bytes + 1, sizeof(char), gf_posix_mt_char);
if (!value) {
ret = -1;
*op_errno = errno;
goto err;
}
for (j = 0; j < i; j++) {
strcat (value, paths[j]);
if (j != i - 1)
strcat (value, priv->gfid2path_sep);
}
value[bytes] = '\0';
ret = dict_set_dynptr (dict, GFID2PATH_VIRT_XATTR_KEY,
value, bytes);
if (ret < 0) {
*op_errno = -ret;
gf_msg (this->name, GF_LOG_ERROR, *op_errno,
P_MSG_DICT_SET_FAILED, "dict set operation "
"on %s for the key %s failed.",
real_path, GFID2PATH_VIRT_XATTR_KEY);
GF_FREE (value);
goto err;
}
}
done:
for (j = 0; j < i; j++) {
if (paths[j])
GF_FREE (paths[j]);
}
ret = 0;
return ret;
err:
if (path)
GF_FREE (path);
for (j = 0; j < i; j++) {
if (paths[j])
GF_FREE (paths[j]);
}
return ret;
}
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