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Diffstat (limited to 'libglusterfs/src/gf-dirent.c')
| -rw-r--r-- | libglusterfs/src/gf-dirent.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/libglusterfs/src/gf-dirent.c b/libglusterfs/src/gf-dirent.c new file mode 100644 index 00000000000..28d1ab42595 --- /dev/null +++ b/libglusterfs/src/gf-dirent.c @@ -0,0 +1,157 @@ +/* + Copyright (c) 2008 Z RESEARCH, Inc. <http://www.zresearch.com> + This file is part of GlusterFS. + + GlusterFS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + GlusterFS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. +*/ + + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + + +#include <stdio.h> +#include <string.h> +#include <stdint.h> +#include "compat.h" +#include "xlator.h" +#include "byte-order.h" + + +struct gf_dirent_nb { + uint64_t d_ino; + uint64_t d_off; + uint32_t d_len; + uint32_t d_type; + char d_name[0]; +} __attribute__((packed)); + + +int +gf_dirent_nb_size (gf_dirent_t *entries) +{ + return (sizeof (struct gf_dirent_nb) + strlen (entries->d_name) + 1); +} + + +gf_dirent_t * +gf_dirent_for_name (const char *name) +{ + gf_dirent_t *gf_dirent = NULL; + + /* TODO: use mem-pool */ + gf_dirent = CALLOC (gf_dirent_size (name), 1); + if (!gf_dirent) + return NULL; + + INIT_LIST_HEAD (&gf_dirent->list); + strcpy (gf_dirent->d_name, name); + + gf_dirent->d_off = 0; + gf_dirent->d_ino = -1; + gf_dirent->d_type = 0; + gf_dirent->d_len = strlen (name); + + return gf_dirent; +} + + +void +gf_dirent_free (gf_dirent_t *entries) +{ + gf_dirent_t *entry = NULL; + gf_dirent_t *tmp = NULL; + + list_for_each_entry_safe (entry, tmp, &entries->list, list) { + list_del (&entry->list); + FREE (entry); + } +} + + +int +gf_dirent_serialize (gf_dirent_t *entries, char *buf, size_t buf_size) +{ + struct gf_dirent_nb *entry_nb = NULL; + gf_dirent_t *entry = NULL; + int size = 0; + int entry_size = 0; + + + list_for_each_entry (entry, &entries->list, list) { + entry_size = gf_dirent_nb_size (entry); + + if (buf && (size + entry_size <= buf_size)) { + entry_nb = (void *) (buf + size); + + entry_nb->d_ino = hton64 (entry->d_ino); + entry_nb->d_off = hton64 (entry->d_off); + entry_nb->d_len = hton32 (entry->d_len); + entry_nb->d_type = hton32 (entry->d_type); + + strcpy (entry_nb->d_name, entry->d_name); + } + size += entry_size; + } + + return size; +} + + +int +gf_dirent_unserialize (gf_dirent_t *entries, const char *buf, size_t buf_size) +{ + struct gf_dirent_nb *entry_nb = NULL; + int remaining_size = 0; + int least_dirent_size = 0; + int count = 0; + gf_dirent_t *entry = NULL; + int entry_strlen = 0; + int entry_len = 0; + + + remaining_size = buf_size; + least_dirent_size = (sizeof (struct gf_dirent_nb) + 2); + + while (remaining_size >= least_dirent_size) { + entry_nb = (void *)(buf + (buf_size - remaining_size)); + + entry_strlen = strnlen (entry_nb->d_name, remaining_size); + if (entry_strlen == remaining_size) { + break; + } + + entry_len = sizeof (gf_dirent_t) + entry_strlen + 1; + entry = CALLOC (1, entry_len); + if (!entry) { + break; + } + + entry->d_ino = ntoh64 (entry_nb->d_ino); + entry->d_off = ntoh64 (entry_nb->d_off); + entry->d_len = ntoh32 (entry_nb->d_len); + entry->d_type = ntoh32 (entry_nb->d_type); + strcpy (entry->d_name, entry_nb->d_name); + + list_add_tail (&entry->list, &entries->list); + + remaining_size -= (sizeof (*entry_nb) + entry_strlen + 1); + count++; + } + + return count; +} |