[Ocfs2-tools-devel] [PATCH 07/19] Ocfs2-tools: Add implementation of generic utils function for o2info.
Sunil Mushran
sunil.mushran at oracle.com
Fri Apr 16 16:00:46 PDT 2010
For the first drop I would like just have --volinfo and --features.
We can tackle other options later. Remove helpers for other
options.
Tristan Ye wrote:
> Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
> ---
> o2info/utils.c | 490 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 490 insertions(+), 0 deletions(-)
> create mode 100644 o2info/utils.c
>
> diff --git a/o2info/utils.c b/o2info/utils.c
> new file mode 100644
> index 0000000..804d076
> --- /dev/null
> +++ b/o2info/utils.c
> @@ -0,0 +1,490 @@
> +/* -*- mode: c; c-basic-offset: 8; -*-
> + * vim: noexpandtab sw=8 ts=8 sts=0:
> + *
> + * utils.c
> + *
> + * utility functions for o2info
> + *
> + * Copyright (C) 2010 Oracle. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public
> + * License version 2 as published by the Free Software Foundation.
> + *
> + * This program 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.
> + */
> +
> +#define _XOPEN_SOURCE 600
> +#define _LARGEFILE64_SOURCE
> +#define _GNU_SOURCE /* Because libc really doesn't want us using O_DIRECT? */
> +
> +#include <unistd.h>
> +#include <errno.h>
> +#include <pwd.h>
> +#include <grp.h>
> +
> +#include "ocfs2/ocfs2.h"
> +#include "tools-internal/verbose.h"
> +
> +#include "utils.h"
> +
> +int o2info_get_compat_flag(uint32_t flag, char **compat)
> +{
> + errcode_t err;
> + char buf[PATH_MAX];
> + ocfs2_fs_options flags = {
> + .opt_compat = flag,
> + };
> +
> + *buf = '\0';
> + err = ocfs2_snprint_feature_flags(buf, PATH_MAX, &flags);
> + if (!err) {
> + *compat = strdup(buf);
> + if (!*compat) {
> + errorf("No memory for allocation\n");
> + err = -1;
> + }
> + } else
> + tcom_err(err, "while processing feature flags");
> +
> + return err;
> +}
> +
> +int o2info_get_incompat_flag(uint32_t flag, char **incompat)
> +{
> + errcode_t err;
> + char buf[PATH_MAX];
> + ocfs2_fs_options flags = {
> + .opt_incompat = flag,
> + };
> +
> + *buf = '\0';
> + err = ocfs2_snprint_feature_flags(buf, PATH_MAX, &flags);
> + if (!err) {
> + *incompat = strdup(buf);
> + if (!*incompat) {
> + errorf("No memory for allocation\n");
> + err = -1;
> + }
> + } else
> + tcom_err(err, "while processing feature flags");
> +
> + return err;
> +}
> +
> +int o2info_get_rocompat_flag(uint32_t flag, char **rocompat)
> +{
> + errcode_t err;
> + char buf[PATH_MAX];
> + ocfs2_fs_options flags = {
> + .opt_ro_compat = flag,
> + };
> +
> + *buf = '\0';
> + err = ocfs2_snprint_feature_flags(buf, PATH_MAX, &flags);
> + if (!err) {
> + *rocompat = strdup(buf);
> + if (!*rocompat) {
> + errorf("No memory for allocation\n");
> + err = -1;
> + }
> + } else
> + tcom_err(err, "while processing feature flags");
> +
> + return err;
> +}
> +
> +errcode_t o2info_open(struct o2info_method *om, int flags)
> +{
> + errcode_t err = 0;
> + int fd, open_flags;
> + ocfs2_filesys *fs = NULL;
> +
> + if (om->om_method == O2INFO_USE_LIBOCFS2) {
> + open_flags = flags|OCFS2_FLAG_HEARTBEAT_DEV_OK|OCFS2_FLAG_RO;
> + err = ocfs2_open(om->om_path, open_flags, 0, 0, &fs);
> + if (err) {
> + tcom_err(err, "while opening device %s", om->om_path);
> + goto out;
> + } else
> + om->om_fs = fs;
> + } else {
> + open_flags = flags | O_RDONLY;
> + fd = open(om->om_path, open_flags);
> + if (fd < 0) {
> + fd = errno;
> + tcom_err(fd, "while opening file %s", om->om_path);
> + err = fd;
> + goto out;
> + } else
> + om->om_fd = fd;
> + }
> +
> +out:
> + return err;
> +}
> +
> +errcode_t o2info_close(struct o2info_method *om)
> +{
> + errcode_t err = 0;
> + int rc = 0;
> +
> + if (om->om_method == O2INFO_USE_LIBOCFS2) {
> + if (om->om_fs) {
> + err = ocfs2_close(om->om_fs);
> + if (err) {
> + tcom_err(err, "while closing device");
> + goto out;
> + }
> + }
> + } else {
> + if (om->om_fd >= 0) {
> + rc = close(om->om_fd);
> + if (rc < 0) {
> + rc = errno;
> + tcom_err(rc, "while closing fd: %d.\n",
> + om->om_fd);
> + err = rc;
> + }
> + }
> + }
> +
> +out:
> + return err;
> +}
> +
> +int o2info_is_device(const char *path)
> +{
> + int rc;
> + struct stat st;
> +
> + rc = stat(path, &st);
> + if (rc < 0) {
> + rc = errno;
> + tcom_err(rc, "while stating %s", path);
> + rc = -1;
> + goto out;
> + }
> +
> + if ((S_ISBLK(st.st_mode)) || (S_ISCHR(st.st_mode)))
> + rc = 1;
> + else
> + rc = 0;
> +
> +out:
> + return rc;
> +}
> +
> +int o2info_get_filetype(struct stat st, char **filetype)
> +{
> + int rc = 0;
> +
> + if (S_ISREG(st.st_mode))
> + if (st.st_size != 0)
> + *filetype = strdup("regular file");
> + else
> + *filetype = strdup("regular empty file");
> + else if (S_ISDIR(st.st_mode))
> + *filetype = strdup("directory");
> + else if (S_ISCHR(st.st_mode))
> + *filetype = strdup("character special file");
> + else if (S_ISBLK(st.st_mode))
> + *filetype = strdup("block special file");
> + else if (S_ISFIFO(st.st_mode))
> + *filetype = strdup("FIFO");
> + else if (S_ISLNK(st.st_mode))
> + if (st.st_blocks == 0)
> + *filetype = strdup("fast symbolic link");
> + else
> + *filetype = strdup("symbolic link");
> + else if (S_ISSOCK(st.st_mode))
> + *filetype = strdup("socket");
> + else {
> + *filetype = strdup("unknown file type");
> + rc = -1;
> + }
> +
> + if (!*filetype) {
> + errorf("No memory for allocation\n");
> + rc = -1;
> + }
> +
> + return rc;
> +}
> +
> +int o2info_get_human_permission(mode_t st_mode, uint16_t *perm, char **h_perm)
> +{
> + int rc = 0;
> + char tmp[11] = "----------";
> +
> + *perm = (uint16_t)(st_mode & 0x00000FFF);
> +
> + tmp[10] = '\0';
> + tmp[9] = (*perm & 0x0001) ? 'x' : '-';
> + tmp[8] = (*perm & 0x0002) ? 'w' : '-';
> + tmp[7] = (*perm & 0x0004) ? 'r' : '-';
> + tmp[6] = (*perm & 0x0008) ? 'x' : '-';
> + tmp[5] = (*perm & 0x0010) ? 'w' : '-';
> + tmp[4] = (*perm & 0x0020) ? 'r' : '-';
> + tmp[3] = (*perm & 0x0040) ? 'x' : '-';
> + tmp[2] = (*perm & 0x0080) ? 'w' : '-';
> + tmp[1] = (*perm & 0x0100) ? 'r' : '-';
> +
> + /*
> + * Handling the setuid/setgid/sticky bits,
> + * by following the convention stat obeys.
> + */
> + if (*perm & 0x0200) {
> + if (*perm & 0x0001)
> + tmp[9] = 't';
> + else
> + tmp[9] = 'T';
> + }
> +
> + if (*perm & 0x0400) {
> + if (*perm & 0x0008)
> + tmp[6] = 's';
> + else
> + tmp[6] = 'S';
> + }
> +
> + if (*perm & 0x0800) {
> + if (*perm & 0x0040)
> + tmp[3] = 's';
> + else
> + tmp[3] = 'S';
> + }
> +
> + if (S_ISCHR(st_mode))
> + tmp[0] = 'c';
> + else if (S_ISBLK(st_mode))
> + tmp[0] = 'b';
> + else if (S_ISFIFO(st_mode))
> + tmp[0] = 'p';
> + else if (S_ISLNK(st_mode))
> + tmp[0] = 'l';
> + else if (S_ISSOCK(st_mode))
> + tmp[0] = 's';
> + else if (S_ISDIR(st_mode))
> + tmp[0] = 'd';
> +
> + *h_perm = strdup(tmp);
> + if (!*h_perm) {
> + errorf("No memory for allocation\n");
> + rc = -1;
> + }
> +
> + return rc;
> +}
> +
> +int o2info_uid2name(uid_t uid, char **uname)
> +{
> + struct passwd *entry;
> + int ret = 0;
> +
> + entry = getpwuid(uid);
> +
> + if (!entry) {
> + errorf("user %d does not exist!\n", uid);
> + ret = -1;
> + } else {
> + *uname = strdup(entry->pw_name);
> + if (*uname == NULL) {
> + errorf("No memory for allocation\n");
> + ret = -1;
> + }
> + }
> +
> + return ret;
> +}
> +
> +int o2info_gid2name(gid_t gid, char **gname)
> +{
> + struct group *group;
> + int ret = 0;
> +
> + group = getgrgid(gid);
> +
> + if (!group) {
> + errorf("group %d does not exist!\n", gid);
> + ret = -1;
> + } else {
> + *gname = strdup(group->gr_name);
> + if (*gname == NULL) {
> + errorf("No memory for allocation\n");
> + ret = -1;
> + }
> + }
> +
> + return ret;
> +}
> +
> +struct timespec o2info_get_stat_atime(struct stat *st)
> +{
> +#ifdef __USE_MISC
> + return st->st_atim;
> +#else
> + struct timespec t;
> + t.tv_sec = st->st_atime;
> + t.tv_nsec = st->st_atimensec;
> + return t;
> +#endif
> +}
> +
> +struct timespec o2info_get_stat_mtime(struct stat *st)
> +{
> +#ifdef __USE_MISC
> + return st->st_mtim;
> +#else
> + struct timespec t;
> + t.tv_sec = st->st_mtime;
> + t.tv_nsec = st->st_mtimensec;
> + return t;
> +#endif
> +}
> +
> +struct timespec o2info_get_stat_ctime(struct stat *st)
> +{
> +#ifdef __USE_MISC
> + return st->st_ctim;
> +#else
> + struct timespec t;
> + t.tv_sec = st->st_ctime;
> + t.tv_nsec = st->st_ctimensec;
> + return t;
> +#endif
> +}
> +
> +/*
> + * Calculate the prefix array out for kmp string matching.
> + */
> +static int *get_prefix(char *str_pattern, int pattern_len)
> +{
> + int i = 1, j = 0;
> + int *prefix = (int *)malloc(pattern_len * sizeof(int));
> +
> + prefix[0] = 0;
> +
> + while (i < pattern_len) {
> +
> + if (str_pattern[i] == str_pattern[j])
> + prefix[i] = ++j;
> + else {
> + j = 0;
> + prefix[i] = j;
> + }
> +
> + i++;
> + }
> +
> + return prefix;
> +}
> +
> +/*
> + * Return the position in source string where first match happened.
> + */
> +static int kmp(const char *str_pattern, int pattern_len,
> + const char *str_target, int target_len,
> + int *prefix)
> +{
> + int i = 0;
> + int j = 0;
> +
> + if (!prefix)
> + return -1;
> +
> + while ((i < pattern_len) && (j < target_len)) {
> +
> + if ((j == 0) || (str_pattern[i] == str_target[j])) {
> + i++;
> + j++;
> + } else
> + j = prefix[j];
> + }
> +
> + if (prefix) {
> + free(prefix);
> + prefix = NULL;
> + }
> +
> + if (j == target_len)
> + return i - j + 1;
> + else
> + return -1;
> +}
> +
> +/*
> + * Replace the fake string like "NNNNNNNNN" with real nseconds.
> + */
> +static int print_nsec_to_htime(char *htime, unsigned long nsec,
> + const char *stuff)
> +{
> + char *s_nsec;
> + int index = 0, ret = 0;
> + int *prefix = get_prefix(htime, strlen(htime));
> +
> + s_nsec = (char *)malloc(strlen(stuff) + 1);
> + snprintf(s_nsec, strlen(stuff) + 1, "%lu", nsec);
> +
> + index = kmp(htime, strlen(htime), stuff, strlen(stuff), prefix);
> + if (index < 0) {
> + ret = -1;
> + goto bail;
> + }
> +
> + strncpy(&htime[index], s_nsec, strlen(stuff));
> +
> +bail:
> + if (s_nsec)
> + free(s_nsec);
> +
> + return 0;
> +}
> +
> +int o2info_get_human_time(char **htime, struct timespec t)
> +{
> + struct tm const *tm = localtime(&t.tv_sec);
> + int ret, size;
> +
> + size = strlen("YYYY-MM-DD HH:MM:SS.NNNNNNNNN +ZZZZ") + 1;
> + *htime = (char *)malloc(size);
> +
> + strftime(*htime, size, "%Y-%m-%d %H:%M:%S.NNNNNNNNN %z", tm);
> + ret = print_nsec_to_htime(*htime, t.tv_nsec, "NNNNNNNNN");
> + if (ret < 0) {
> + errorf("print n_seconds failed.");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +int o2info_get_human_path(mode_t st_mode, const char *path, char **h_path)
> +{
> + int rc;
> + char link[PATH_MAX];
> + char tmp_path[PATH_MAX * 2 + 4];
> +
> + if (!S_ISLNK(st_mode))
> + *h_path = strdup(path);
> + else {
> + rc = readlink(path, link, PATH_MAX);
> + if (rc < 0) {
> + rc = errno;
> + tcom_err(rc, "while readlink %s", path);
> + return -1;
> + } else
> + link[rc] = '\0';
> +
> + strncpy(tmp_path, path, PATH_MAX);
> + strcat(tmp_path, " -> ");
> + strcat(tmp_path, link);
> +
> + *h_path = strdup(tmp_path);
> + }
> +
> + return 0;
> +}
>
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