/**
* @brief Get supplementary groups given uid
*
* @param[in] uid The uid of the user
* @param[out] group_data
*
* @return true if successful, false otherwise
*/
bool uid2grp(uid_t uid, struct group_data **gdata)
{
bool success = false;
PTHREAD_RWLOCK_rdlock(&uid2grp_user_lock);
success = uid2grp_lookup_by_uid(uid, gdata);
/* Handle common case first */
if (success && !uid2grp_expired(*gdata)) {
uid2grp_hold_group_data(*gdata);
PTHREAD_RWLOCK_unlock(&uid2grp_user_lock);
return success;
}
PTHREAD_RWLOCK_unlock(&uid2grp_user_lock);
if (success) {
/* Cache entry is expired */
PTHREAD_RWLOCK_wrlock(&uid2grp_user_lock);
uid2grp_remove_by_uid(uid);
PTHREAD_RWLOCK_unlock(&uid2grp_user_lock);
}
*gdata = uid2grp_allocate_by_uid(uid);
PTHREAD_RWLOCK_wrlock(&uid2grp_user_lock);
if (*gdata)
uid2grp_add_user(*gdata);
success = uid2grp_lookup_by_uid(uid, gdata);
if (success)
uid2grp_hold_group_data(*gdata);
PTHREAD_RWLOCK_unlock(&uid2grp_user_lock);
return success;
}
/**
* @brief Add a user entry to the cache
*
* @note The caller must hold uid2grp_user_lock for write.
*
* @param[in] group_data that has supplementary groups allocated
*
* @retval true on success.
* @retval false if our reach exceeds our grasp.
*/
bool uid2grp_add_user(struct group_data *gdata)
{
struct avltree_node *name_node;
struct avltree_node *id_node;
struct avltree_node *name_node2 = NULL;
struct avltree_node *id_node2 = NULL;
struct cache_info *info;
struct cache_info *tmp;
info = gsh_malloc(sizeof(struct cache_info));
if (!info) {
LogEvent(COMPONENT_IDMAPPER, "memory alloc failed");
return false;
}
info->uid = gdata->uid;
info->uname.addr = gdata->uname.addr;
info->uname.len = gdata->uname.len;
info->gdata = gdata;
/* The refcount on group_data should be 1 when we put it in
* AVL trees.
*/
uid2grp_hold_group_data(gdata);
/* We may have lost the race to insert. We remove existing
* entry and insert this new entry if so!
*/
name_node = avltree_insert(&info->uname_node, &uname_tree);
if (unlikely(name_node)) {
tmp = avltree_container_of(name_node,
struct cache_info,
uname_node);
uid2grp_remove_user(tmp);
name_node2 = avltree_insert(&info->uname_node, &uname_tree);
}
id_node = avltree_insert(&info->uid_node, &uid_tree);
if (unlikely(id_node)) {
/* We should not come here unless someone changed uid of
* a user. Remove old entry and re-insert the new
* entry.
*/
tmp = avltree_container_of(id_node,
struct cache_info,
uid_node);
uid2grp_remove_user(tmp);
id_node2 = avltree_insert(&info->uid_node, &uid_tree);
}
uid_grplist_cache[info->uid % id_cache_size] = &info->uid_node;
if (name_node && id_node)
LogWarn(COMPONENT_IDMAPPER, "shouldn't happen, internal error");
if ((name_node && name_node2) || (id_node && id_node2))
LogWarn(COMPONENT_IDMAPPER, "shouldn't happen, internal error");
return true;
}
int _9p_walk(struct _9p_request_data *req9p, void *worker_data,
u32 *plenout, char *preply)
{
char *cursor = req9p->_9pmsg + _9P_HDR_SIZE + _9P_TYPE_SIZE;
unsigned int i = 0;
u16 *msgtag = NULL;
u32 *fid = NULL;
u32 *newfid = NULL;
u16 *nwname = NULL;
u16 *wnames_len;
char *wnames_str;
uint64_t fileid;
cache_inode_status_t cache_status;
cache_entry_t *pentry = NULL;
char name[MAXNAMLEN];
u16 *nwqid;
struct _9p_fid *pfid = NULL;
struct _9p_fid *pnewfid = NULL;
/* Now Get data */
_9p_getptr(cursor, msgtag, u16);
_9p_getptr(cursor, fid, u32);
_9p_getptr(cursor, newfid, u32);
_9p_getptr(cursor, nwname, u16);
LogDebug(COMPONENT_9P, "TWALK: tag=%u fid=%u newfid=%u nwname=%u",
(u32) *msgtag, *fid, *newfid, *nwname);
if (*fid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, worker_data, msgtag, ERANGE, plenout,
preply);
if (*newfid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, worker_data, msgtag, ERANGE, plenout,
preply);
pfid = req9p->pconn->fids[*fid];
/* Check that it is a valid fid */
if (pfid == NULL || pfid->pentry == NULL) {
LogDebug(COMPONENT_9P, "request on invalid fid=%u", *fid);
return _9p_rerror(req9p, worker_data, msgtag, EIO, plenout,
preply);
}
op_ctx = &pfid->op_context;
pnewfid = gsh_calloc(1, sizeof(struct _9p_fid));
if (pnewfid == NULL)
return _9p_rerror(req9p, worker_data, msgtag, ERANGE, plenout,
preply);
/* Is this a lookup or a fid cloning operation ? */
if (*nwname == 0) {
/* Cloning operation */
memcpy((char *)pnewfid, (char *)pfid, sizeof(struct _9p_fid));
/* Set the new fid id */
pnewfid->fid = *newfid;
/* This is not a TATTACH fid */
pnewfid->from_attach = false;
/* Increments refcount */
(void) cache_inode_lru_ref(pnewfid->pentry, LRU_REQ_STALE_OK);
} else {
/* the walk is in fact a lookup */
pentry = pfid->pentry;
for (i = 0; i < *nwname; i++) {
_9p_getstr(cursor, wnames_len, wnames_str);
snprintf(name, MAXNAMLEN, "%.*s", *wnames_len,
wnames_str);
LogDebug(COMPONENT_9P,
"TWALK (lookup): tag=%u fid=%u newfid=%u (component %u/%u :%s)",
(u32) *msgtag, *fid, *newfid, i + 1, *nwname,
name);
if (pnewfid->pentry == pentry)
pnewfid->pentry = NULL;
/* refcount +1 */
cache_status =
cache_inode_lookup(pentry, name, &pnewfid->pentry);
if (pnewfid->pentry == NULL) {
gsh_free(pnewfid);
return _9p_rerror(req9p, worker_data, msgtag,
_9p_tools_errno(cache_status),
plenout, preply);
}
if (pentry != pfid->pentry)
cache_inode_put(pentry);
pentry = pnewfid->pentry;
}
pnewfid->fid = *newfid;
pnewfid->op_context = pfid->op_context;
pnewfid->ppentry = pfid->pentry;
strncpy(pnewfid->name, name, MAXNAMLEN-1);
/* gdata ref is not hold : the pfid, which use same gdata */
/* will be clunked after pnewfid */
/* This clunk release the gdata */
pnewfid->gdata = pfid->gdata;
/* This is not a TATTACH fid */
pnewfid->from_attach = false;
cache_status = cache_inode_fileid(pnewfid->pentry, &fileid);
if (cache_status != CACHE_INODE_SUCCESS) {
gsh_free(pnewfid);
return _9p_rerror(req9p, worker_data, msgtag,
_9p_tools_errno(cache_status),
plenout, preply);
}
/* Build the qid */
/* No cache, we want the client to stay synchronous
* with the server */
pnewfid->qid.version = 0;
pnewfid->qid.path = fileid;
pnewfid->specdata.xattr.xattr_id = 0;
pnewfid->specdata.xattr.xattr_content = NULL;
switch (pnewfid->pentry->type) {
case REGULAR_FILE:
case CHARACTER_FILE:
case BLOCK_FILE:
case SOCKET_FILE:
case FIFO_FILE:
pnewfid->qid.type = _9P_QTFILE;
break;
case SYMBOLIC_LINK:
pnewfid->qid.type = _9P_QTSYMLINK;
break;
case DIRECTORY:
pnewfid->qid.type = _9P_QTDIR;
break;
default:
LogMajor(COMPONENT_9P,
"implementation error, you should not see this message !!!!!!");
gsh_free(pnewfid);
return _9p_rerror(req9p, worker_data, msgtag, EINVAL,
plenout, preply);
break;
}
}
/* keep info on new fid */
req9p->pconn->fids[*newfid] = pnewfid;
/* As much qid as requested fid */
nwqid = nwname;
/* Hold refcount on gdata */
uid2grp_hold_group_data(pnewfid->gdata);
/* Build the reply */
_9p_setinitptr(cursor, preply, _9P_RWALK);
_9p_setptr(cursor, msgtag, u16);
_9p_setptr(cursor, nwqid, u16);
for (i = 0; i < *nwqid; i++) {
/** @todo: should be different qids
* for each directory walked through */
_9p_setqid(cursor, pnewfid->qid);
}
_9p_setendptr(cursor, preply);
_9p_checkbound(cursor, preply, plenout);
LogDebug(COMPONENT_9P,
"RWALK: tag=%u fid=%u newfid=%u nwqid=%u fileid=%llu pentry=%p refcount=%i",
(u32) *msgtag, *fid, *newfid, *nwqid,
(unsigned long long)pnewfid->qid.path, pnewfid->pentry,
pnewfid->pentry->lru.refcnt);
return 1;
}
int _9p_xattrwalk(struct _9p_request_data *req9p, u32 *plenout, char *preply)
{
char *cursor = req9p->_9pmsg + _9P_HDR_SIZE + _9P_TYPE_SIZE;
u16 *msgtag = NULL;
u32 *fid = NULL;
u32 *attrfid = NULL;
u16 *name_len;
char *name_str;
size_t attrsize = 0;
fsal_status_t fsal_status;
char name[MAXNAMLEN];
fsal_xattrent_t xattrs_arr[XATTRS_ARRAY_LEN];
int eod_met = false;
unsigned int nb_xattrs_read = 0;
unsigned int i = 0;
char *xattr_cursor = NULL;
unsigned int tmplen = 0;
struct _9p_fid *pfid = NULL;
struct _9p_fid *pxattrfid = NULL;
/* Get data */
_9p_getptr(cursor, msgtag, u16);
_9p_getptr(cursor, fid, u32);
_9p_getptr(cursor, attrfid, u32);
LogDebug(COMPONENT_9P, "TXATTRWALK: tag=%u fid=%u attrfid=%u",
(u32) *msgtag, *fid, *attrfid);
_9p_getstr(cursor, name_len, name_str);
if (*name_len == 0)
LogDebug(COMPONENT_9P,
"TXATTRWALK (component): tag=%u fid=%u attrfid=%u name=(LIST XATTR)",
(u32) *msgtag, *fid, *attrfid);
else
LogDebug(COMPONENT_9P,
"TXATTRWALK (component): tag=%u fid=%u attrfid=%u name=%.*s",
(u32) *msgtag, *fid, *attrfid, *name_len, name_str);
if (*fid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, msgtag, ERANGE, plenout, preply);
if (*attrfid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, msgtag, ERANGE, plenout, preply);
pfid = req9p->pconn->fids[*fid];
/* Check that it is a valid fid */
if (pfid == NULL || pfid->pentry == NULL) {
LogDebug(COMPONENT_9P, "request on invalid fid=%u", *fid);
return _9p_rerror(req9p, msgtag, EIO, plenout, preply);
}
pxattrfid = gsh_calloc(1, sizeof(struct _9p_fid));
if (pxattrfid == NULL)
return _9p_rerror(req9p, msgtag, ENOMEM, plenout, preply);
/* set op_ctx, it will be useful if FSAL is later called */
_9p_init_opctx(pfid, req9p);
/* Initiate xattr's fid by copying file's fid in it */
memcpy((char *)pxattrfid, (char *)pfid, sizeof(struct _9p_fid));
snprintf(name, MAXNAMLEN, "%.*s", *name_len, name_str);
pxattrfid->specdata.xattr.xattr_content = gsh_malloc(XATTR_BUFFERSIZE);
if (pxattrfid->specdata.xattr.xattr_content == NULL) {
gsh_free(pxattrfid);
return _9p_rerror(req9p, msgtag, ENOMEM, plenout, preply);
}
if (*name_len == 0) {
/* xattrwalk is used with an empty name,
* this is a listxattr request */
fsal_status =
pxattrfid->pentry->obj_handle->obj_ops.list_ext_attrs(
pxattrfid->pentry->obj_handle,
FSAL_XATTR_RW_COOKIE, /* Start with RW cookie,
* hiding RO ones */
xattrs_arr,
XATTRS_ARRAY_LEN, /** @todo fix static length */
&nb_xattrs_read,
&eod_met);
if (FSAL_IS_ERROR(fsal_status)) {
gsh_free(pxattrfid->specdata.xattr.xattr_content);
gsh_free(pxattrfid);
return _9p_rerror(req9p, msgtag,
_9p_tools_errno
(cache_inode_error_convert
(fsal_status)), plenout, preply);
}
/* if all xattrent are not read,
* returns ERANGE as listxattr does */
if (eod_met != true) {
gsh_free(pxattrfid->specdata.xattr.xattr_content);
gsh_free(pxattrfid);
return _9p_rerror(req9p, msgtag, ERANGE,
plenout, preply);
}
xattr_cursor = pxattrfid->specdata.xattr.xattr_content;
attrsize = 0;
for (i = 0; i < nb_xattrs_read; i++) {
tmplen =
snprintf(xattr_cursor, MAXNAMLEN, "%s",
xattrs_arr[i].xattr_name);
xattr_cursor[tmplen] = '\0'; /* Just to be sure */
/* +1 for trailing '\0' */
xattr_cursor += tmplen + 1;
attrsize += tmplen + 1;
/* Make sure not to go beyond the buffer */
if (attrsize > XATTR_BUFFERSIZE) {
gsh_free(pxattrfid->specdata.xattr.
xattr_content);
gsh_free(pxattrfid);
return _9p_rerror(req9p, msgtag, ERANGE,
plenout, preply);
}
}
} else {
/* xattrwalk has a non-empty name, use regular setxattr */
fsal_status =
pxattrfid->pentry->obj_handle->obj_ops.
getextattr_id_by_name(pxattrfid->pentry->obj_handle,
name,
&pxattrfid->specdata.xattr.xattr_id);
if (FSAL_IS_ERROR(fsal_status)) {
gsh_free(pxattrfid->specdata.xattr.xattr_content);
gsh_free(pxattrfid);
/* ENOENT for xattr is ENOATTR */
if (fsal_status.major == ERR_FSAL_NOENT)
return _9p_rerror(req9p, msgtag, ENOATTR,
plenout, preply);
else
return _9p_rerror(req9p, msgtag,
_9p_tools_errno
(cache_inode_error_convert
(fsal_status)), plenout,
preply);
}
fsal_status =
pxattrfid->pentry->obj_handle->obj_ops.
getextattr_value_by_name(pxattrfid->pentry->obj_handle,
name,
pxattrfid->specdata.xattr.
xattr_content, XATTR_BUFFERSIZE,
&attrsize);
if (FSAL_IS_ERROR(fsal_status)) {
gsh_free(pxattrfid->specdata.xattr.xattr_content);
gsh_free(pxattrfid);
/* fsal_status.minor is a valid errno code */
return _9p_rerror(req9p, msgtag,
fsal_status.minor, plenout, preply);
}
}
req9p->pconn->fids[*attrfid] = pxattrfid;
/* Increments refcount as we're manually making a new copy */
(void) cache_inode_lru_ref(pfid->pentry, LRU_REQ_STALE_OK);
/* hold reference on gdata */
uid2grp_hold_group_data(pxattrfid->gdata);
get_gsh_export_ref(pfid->export);
get_9p_user_cred_ref(pfid->ucred);
/* Build the reply */
_9p_setinitptr(cursor, preply, _9P_RXATTRWALK);
_9p_setptr(cursor, msgtag, u16);
_9p_setvalue(cursor, attrsize, u64);
_9p_setendptr(cursor, preply);
_9p_checkbound(cursor, preply, plenout);
LogDebug(COMPONENT_9P,
"RXATTRWALK: tag=%u fid=%u attrfid=%u name=%.*s size=%llu",
(u32) *msgtag, *fid, *attrfid, *name_len, name_str,
(unsigned long long)attrsize);
return 1;
} /* _9p_xattrwalk */
