mirror of
git://sourceware.org/git/lvm2.git
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321 lines
7.4 KiB
C
321 lines
7.4 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "config.h"
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#include "crc.h"
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#include "device.h"
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#include "str_list.h"
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#include "toolcontext.h"
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#include "lvm-string.h"
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#include "lvm-file.h"
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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void destroy_config_tree(struct dm_config_tree *cft)
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{
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struct device *dev = dm_config_get_custom(cft);
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if (dev)
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dev_close(dev);
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dm_config_destroy(cft);
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}
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/*
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* Returns config tree if it was removed.
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*/
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struct dm_config_tree *remove_overridden_config_tree(struct cmd_context *cmd)
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{
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// FIXME Replace cmd->cft with clean copy of merged lvm*.conf tree
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struct dm_config_tree *old_cft = cmd->cft;
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struct dm_config_tree *cft = dm_config_remove_cascaded_tree(cmd->cft);
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if (!cft)
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return NULL;
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cmd->cft = cft;
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return old_cft;
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}
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// FIXME Retain a copy of the string (or tree?) in cmd->cft_cmdline
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// FIXME and merge into cmd->cft
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int override_config_tree_from_string(struct cmd_context *cmd,
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const char *config_settings)
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{
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struct dm_config_tree *cft_new;
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if (!(cft_new = dm_config_from_string(config_settings))) {
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log_error("Failed to set overridden configuration entries.");
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return 1;
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}
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cmd->cft = dm_config_insert_cascaded_tree(cft_new, cmd->cft);
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return 0;
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}
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int read_config_fd(struct dm_config_tree *cft, struct device *dev,
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off_t offset, size_t size, off_t offset2, size_t size2,
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checksum_fn_t checksum_fn, uint32_t checksum)
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{
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const char *fb, *fe;
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int r = 0;
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int use_mmap = 1;
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off_t mmap_offset = 0;
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char *buf = NULL;
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/* Only use mmap with regular files */
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if (!(dev->flags & DEV_REGULAR) || size2)
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use_mmap = 0;
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if (use_mmap) {
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mmap_offset = offset % lvm_getpagesize();
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/* memory map the file */
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fb = mmap((caddr_t) 0, size + mmap_offset, PROT_READ,
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MAP_PRIVATE, dev_fd(dev), offset - mmap_offset);
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if (fb == (caddr_t) (-1)) {
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log_sys_error("mmap", dev_name(dev));
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goto out;
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}
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fb = fb + mmap_offset;
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} else {
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if (!(buf = dm_malloc(size + size2))) {
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log_error("Failed to allocate circular buffer.");
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return 0;
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}
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if (!dev_read_circular(dev, (uint64_t) offset, size,
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(uint64_t) offset2, size2, buf)) {
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goto out;
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}
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fb = buf;
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}
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if (checksum_fn && checksum !=
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(checksum_fn(checksum_fn(INITIAL_CRC, (const uint8_t *)fb, size),
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(const uint8_t *)(fb + size), size2))) {
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log_error("%s: Checksum error", dev_name(dev));
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goto out;
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}
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fe = fb + size + size2;
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if (!dm_config_parse(cft, fb, fe))
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goto_out;
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r = 1;
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out:
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if (!use_mmap)
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dm_free(buf);
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else {
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/* unmap the file */
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if (munmap((char *) (fb - mmap_offset), size + mmap_offset)) {
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log_sys_error("munmap", dev_name(dev));
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r = 0;
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}
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}
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return r;
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}
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int read_config_file(struct dm_config_tree *cft)
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{
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const char *filename = NULL;
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struct device *dev = dm_config_get_custom(cft);
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struct stat info;
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int r;
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if (!dm_config_check_file(cft, &filename, &info))
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return_0;
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/* Nothing to do. E.g. empty file. */
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if (!filename)
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return 1;
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if (!dev) {
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if (!(dev = dev_create_file(filename, NULL, NULL, 1)))
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return_0;
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if (!dev_open_readonly_buffered(dev))
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return_0;
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}
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dm_config_set_custom(cft, dev);
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r = read_config_fd(cft, dev, 0, (size_t) info.st_size, 0, 0,
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(checksum_fn_t) NULL, 0);
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if (!dm_config_keep_open(cft)) {
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dev_close(dev);
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dm_config_set_custom(cft, NULL);
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}
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return r;
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}
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const struct dm_config_node *find_config_tree_node(struct cmd_context *cmd,
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const char *path)
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{
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return dm_config_tree_find_node(cmd->cft, path);
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}
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const char *find_config_tree_str(struct cmd_context *cmd,
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const char *path, const char *fail)
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{
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return dm_config_tree_find_str(cmd->cft, path, fail);
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}
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int find_config_tree_int(struct cmd_context *cmd, const char *path,
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int fail)
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{
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return dm_config_tree_find_int(cmd->cft, path, fail);
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}
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int64_t find_config_tree_int64(struct cmd_context *cmd, const char *path, int64_t fail)
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{
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return dm_config_tree_find_int64(cmd->cft, path, fail);
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}
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float find_config_tree_float(struct cmd_context *cmd, const char *path,
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float fail)
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{
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return dm_config_tree_find_float(cmd->cft, path, fail);
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}
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int find_config_tree_bool(struct cmd_context *cmd, const char *path, int fail)
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{
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return dm_config_tree_find_bool(cmd->cft, path, fail);
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}
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/* Insert cn2 after cn1 */
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static void _insert_config_node(struct dm_config_node **cn1,
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struct dm_config_node *cn2)
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{
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if (!*cn1) {
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*cn1 = cn2;
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cn2->sib = NULL;
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} else {
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cn2->sib = (*cn1)->sib;
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(*cn1)->sib = cn2;
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}
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}
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/*
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* Merge section cn2 into section cn1 (which has the same name)
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* overwriting any existing cn1 nodes with matching names.
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*/
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static void _merge_section(struct dm_config_node *cn1, struct dm_config_node *cn2)
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{
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struct dm_config_node *cn, *nextn, *oldn;
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struct dm_config_value *cv;
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for (cn = cn2->child; cn; cn = nextn) {
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nextn = cn->sib;
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/* Skip "tags" */
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if (!strcmp(cn->key, "tags"))
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continue;
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/* Subsection? */
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if (!cn->v)
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/* Ignore - we don't have any of these yet */
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continue;
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/* Not already present? */
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if (!(oldn = dm_config_find_node(cn1->child, cn->key))) {
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_insert_config_node(&cn1->child, cn);
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continue;
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}
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/* Merge certain value lists */
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if ((!strcmp(cn1->key, "activation") &&
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!strcmp(cn->key, "volume_list")) ||
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(!strcmp(cn1->key, "devices") &&
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(!strcmp(cn->key, "filter") || !strcmp(cn->key, "types")))) {
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cv = cn->v;
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while (cv->next)
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cv = cv->next;
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cv->next = oldn->v;
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}
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/* Replace values */
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oldn->v = cn->v;
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}
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}
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static int _match_host_tags(struct dm_list *tags, const struct dm_config_node *tn)
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{
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const struct dm_config_value *tv;
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const char *str;
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for (tv = tn->v; tv; tv = tv->next) {
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if (tv->type != DM_CFG_STRING)
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continue;
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str = tv->v.str;
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if (*str == '@')
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str++;
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if (!*str)
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continue;
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if (str_list_match_item(tags, str))
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return 1;
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}
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return 0;
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}
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/* Destructively merge a new config tree into an existing one */
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int merge_config_tree(struct cmd_context *cmd, struct dm_config_tree *cft,
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struct dm_config_tree *newdata)
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{
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struct dm_config_node *root = cft->root;
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struct dm_config_node *cn, *nextn, *oldn, *cn2;
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const struct dm_config_node *tn;
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for (cn = newdata->root; cn; cn = nextn) {
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nextn = cn->sib;
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/* Ignore tags section */
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if (!strcmp(cn->key, "tags"))
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continue;
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/* If there's a tags node, skip if host tags don't match */
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if ((tn = dm_config_find_node(cn->child, "tags"))) {
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if (!_match_host_tags(&cmd->tags, tn))
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continue;
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}
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if (!(oldn = dm_config_find_node(root, cn->key))) {
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_insert_config_node(&cft->root, cn);
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/* Remove any "tags" nodes */
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for (cn2 = cn->child; cn2; cn2 = cn2->sib) {
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if (!strcmp(cn2->key, "tags")) {
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cn->child = cn2->sib;
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continue;
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}
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if (cn2->sib && !strcmp(cn2->sib->key, "tags")) {
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cn2->sib = cn2->sib->sib;
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continue;
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}
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}
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continue;
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}
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_merge_section(oldn, cn);
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}
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return 1;
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}
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