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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.
*/
#include "syncop.h"
#include "common-utils.h"
#include "libglusterfs-messages.h"
int
syncop_dirfd (xlator_t *subvol, loc_t *loc, fd_t **fd, int pid)
{
int ret = 0;
fd_t *dirfd = NULL;
if (!fd)
return -EINVAL;
dirfd = fd_create (loc->inode, pid);
if (!dirfd) {
gf_msg (subvol->name, GF_LOG_ERROR, errno,
LG_MSG_FD_CREATE_FAILED, "fd_create of %s",
uuid_utoa (loc->gfid));
ret = -errno;
goto out;
}
ret = syncop_opendir (subvol, loc, dirfd, NULL, NULL);
if (ret) {
/*
* On Linux, if the brick was not updated, opendir will
* fail. We therefore use backward compatible code
* that violate the standards by reusing offsets
* in seekdir() from different DIR *, but it works on Linux.
*
* On other systems it never worked, hence we do not need
* to provide backward-compatibility.
*/
#ifdef GF_LINUX_HOST_OS
fd_unref (dirfd);
dirfd = fd_anonymous (loc->inode);
if (!dirfd) {
gf_msg (subvol->name, GF_LOG_ERROR, errno,
LG_MSG_FD_ANONYMOUS_FAILED, "fd_anonymous of "
"%s", uuid_utoa (loc->gfid));
ret = -errno;
goto out;
}
ret = 0;
#else /* GF_LINUX_HOST_OS */
fd_unref (dirfd);
gf_msg (subvol->name, GF_LOG_ERROR, errno,
LG_MSG_DIR_OP_FAILED, "opendir of %s",
uuid_utoa (loc->gfid));
goto out;
#endif /* GF_LINUX_HOST_OS */
} else {
fd_bind (dirfd);
}
out:
if (ret == 0)
*fd = dirfd;
return ret;
}
int
syncop_ftw (xlator_t *subvol, loc_t *loc, int pid, void *data,
int (*fn) (xlator_t *subvol, gf_dirent_t *entry, loc_t *parent,
void *data))
{
loc_t child_loc = {0, };
fd_t *fd = NULL;
uint64_t offset = 0;
gf_dirent_t *entry = NULL;
int ret = 0;
gf_dirent_t entries;
ret = syncop_dirfd (subvol, loc, &fd, pid);
if (ret)
goto out;
INIT_LIST_HEAD (&entries.list);
while ((ret = syncop_readdirp (subvol, fd, 131072, offset, &entries,
NULL, NULL))) {
if (ret < 0)
break;
if (ret > 0) {
/* If the entries are only '.', and '..' then ret
* value will be non-zero. so set it to zero here. */
ret = 0;
}
list_for_each_entry (entry, &entries.list, list) {
offset = entry->d_off;
if (!strcmp (entry->d_name, ".") ||
!strcmp (entry->d_name, ".."))
continue;
gf_link_inode_from_dirent (NULL, fd->inode, entry);
ret = fn (subvol, entry, loc, data);
if (ret)
break;
if (entry->d_stat.ia_type == IA_IFDIR) {
child_loc.inode = inode_ref (entry->inode);
gf_uuid_copy (child_loc.gfid, entry->inode->gfid);
ret = syncop_ftw (subvol, &child_loc,
pid, data, fn);
loc_wipe (&child_loc);
if (ret)
break;
}
}
gf_dirent_free (&entries);
if (ret)
break;
}
out:
if (fd)
fd_unref (fd);
return ret;
}
/**
* Syncop_ftw_throttle can be used in a configurable way to control
* the speed at which crawling is done. It takes 2 more arguments
* compared to syncop_ftw.
* After @count entries are finished in a directory (to be
* precise, @count files) sleep for @sleep_time seconds.
* If either @count or @sleep_time is <=0, then it behaves similar to
* syncop_ftw.
*/
int
syncop_ftw_throttle (xlator_t *subvol, loc_t *loc, int pid, void *data,
int (*fn) (xlator_t *subvol, gf_dirent_t *entry,
loc_t *parent, void *data),
int count, int sleep_time)
{
loc_t child_loc = {0, };
fd_t *fd = NULL;
uint64_t offset = 0;
gf_dirent_t *entry = NULL;
int ret = 0;
gf_dirent_t entries;
int tmp = 0;
if (sleep_time <= 0) {
ret = syncop_ftw (subvol, loc, pid, data, fn);
goto out;
}
ret = syncop_dirfd (subvol, loc, &fd, pid);
if (ret)
goto out;
INIT_LIST_HEAD (&entries.list);
while ((ret = syncop_readdirp (subvol, fd, 131072, offset, &entries,
NULL, NULL))) {
if (ret < 0)
break;
if (ret > 0) {
/* If the entries are only '.', and '..' then ret
* value will be non-zero. so set it to zero here. */
ret = 0;
}
tmp = 0;
list_for_each_entry (entry, &entries.list, list) {
offset = entry->d_off;
if (!strcmp (entry->d_name, ".") ||
!strcmp (entry->d_name, ".."))
continue;
if (++tmp >= count) {
tmp = 0;
sleep (sleep_time);
}
gf_link_inode_from_dirent (NULL, fd->inode, entry);
ret = fn (subvol, entry, loc, data);
if (ret)
continue;
if (entry->d_stat.ia_type == IA_IFDIR) {
child_loc.inode = inode_ref (entry->inode);
gf_uuid_copy (child_loc.gfid, entry->inode->gfid);
ret = syncop_ftw_throttle (subvol, &child_loc,
pid, data, fn, count,
sleep_time);
loc_wipe (&child_loc);
if (ret)
continue;
}
}
gf_dirent_free (&entries);
if (ret)
break;
}
out:
if (fd)
fd_unref (fd);
return ret;
}
int
syncop_dir_scan (xlator_t *subvol, loc_t *loc, int pid, void *data,
int (*fn) (xlator_t *subvol, gf_dirent_t *entry, loc_t *parent,
void *data))
{
fd_t *fd = NULL;
uint64_t offset = 0;
gf_dirent_t *entry = NULL;
int ret = 0;
gf_dirent_t entries;
ret = syncop_dirfd (subvol, loc, &fd, pid);
if (ret)
goto out;
INIT_LIST_HEAD (&entries.list);
while ((ret = syncop_readdir (subvol, fd, 131072, offset, &entries,
NULL, NULL))) {
if (ret < 0)
break;
if (ret > 0) {
/* If the entries are only '.', and '..' then ret
* value will be non-zero. so set it to zero here. */
ret = 0;
}
list_for_each_entry (entry, &entries.list, list) {
offset = entry->d_off;
if (!strcmp (entry->d_name, ".") ||
!strcmp (entry->d_name, ".."))
continue;
ret = fn (subvol, entry, loc, data);
if (ret)
break;
}
gf_dirent_free (&entries);
if (ret)
break;
}
out:
if (fd)
fd_unref (fd);
return ret;
}
int
syncop_is_subvol_local (xlator_t *this, loc_t *loc, gf_boolean_t *is_local)
{
char *pathinfo = NULL;
dict_t *xattr = NULL;
int ret = 0;
if (!this || !this->type || !is_local)
return -EINVAL;
if (strcmp (this->type, "protocol/client") != 0)
return -EINVAL;
*is_local = _gf_false;
ret = syncop_getxattr (this, loc, &xattr, GF_XATTR_PATHINFO_KEY, NULL,
NULL);
if (ret < 0) {
ret = -1;
goto out;
}
if (!xattr) {
ret = -EINVAL;
goto out;
}
ret = dict_get_str (xattr, GF_XATTR_PATHINFO_KEY, &pathinfo);
if (ret)
goto out;
ret = glusterfs_is_local_pathinfo (pathinfo, is_local);
gf_msg_debug (this->name, 0, "subvol %s is %slocal",
this->name, is_local ? "" : "not ");
out:
if (xattr)
dict_unref (xattr);
return ret;
}
int
syncop_gfid_to_path (inode_table_t *itable, xlator_t *subvol, uuid_t gfid,
char **path_p)
{
int ret = 0;
char *path = NULL;
loc_t loc = {0,};
dict_t *xattr = NULL;
gf_uuid_copy (loc.gfid, gfid);
loc.inode = inode_new (itable);
ret = syncop_getxattr (subvol, &loc, &xattr, GFID_TO_PATH_KEY, NULL,
NULL);
if (ret < 0)
goto out;
ret = dict_get_str (xattr, GFID_TO_PATH_KEY, &path);
if (ret || !path) {
ret = -EINVAL;
goto out;
}
if (path_p) {
*path_p = gf_strdup (path);
if (!*path_p) {
ret = -ENOMEM;
goto out;
}
}
ret = 0;
out:
if (xattr)
dict_unref (xattr);
loc_wipe (&loc);
return ret;
}
|
