[Ocfs2-tools-devel] [PATCH 07/19] Ocfs2-tools: Add implementation of generic utils function for o2info.
Tristan Ye
tristan.ye at oracle.com
Tue Apr 13 19:50:07 PDT 2010
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;
+}
--
1.5.5
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