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git://sourceware.org/git/lvm2.git
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53d7985fa1
Basic support to keep info when the LV was created. Host and time is stored into LV mda section. FIXME: Current version doesn't support configurable string via lvm.conf and used fixed version strftime "%Y-%m-%d %T %z".
834 lines
17 KiB
C
834 lines
17 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2009 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 "import-export.h"
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#include "metadata.h"
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#include "display.h"
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#include "lvm-string.h"
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#include "segtype.h"
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#include "text_export.h"
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#include "lvm-version.h"
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#include <stdarg.h>
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#include <time.h>
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#include <sys/utsname.h>
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struct formatter;
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__attribute__((format(printf, 3, 0)))
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typedef int (*out_with_comment_fn) (struct formatter * f, const char *comment,
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const char *fmt, va_list ap);
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typedef int (*nl_fn) (struct formatter * f);
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/*
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* Macro for formatted output.
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* out_with_comment_fn returns -1 if data didn't fit and buffer was expanded.
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* Then argument list is reset and out_with_comment_fn is called again.
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*/
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#define _out_with_comment(f, buffer, fmt, ap) \
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do { \
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va_start(ap, fmt); \
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r = f->out_with_comment(f, buffer, fmt, ap); \
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va_end(ap); \
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} while (r == -1)
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/*
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* The first half of this file deals with
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* exporting the vg, ie. writing it to a file.
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*/
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struct formatter {
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struct dm_pool *mem; /* pv names allocated from here */
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struct dm_hash_table *pv_names; /* dev_name -> pv_name (eg, pv1) */
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union {
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FILE *fp; /* where we're writing to */
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struct {
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char *start;
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uint32_t size;
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uint32_t used;
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} buf;
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} data;
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out_with_comment_fn out_with_comment;
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nl_fn nl;
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int indent; /* current level of indentation */
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int error;
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int header; /* 1 => comments at start; 0 => end */
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};
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static struct utsname _utsname;
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static void _init(void)
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{
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static int _initialised = 0;
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if (_initialised)
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return;
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if (uname(&_utsname)) {
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log_error("uname failed: %s", strerror(errno));
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memset(&_utsname, 0, sizeof(_utsname));
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}
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_initialised = 1;
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}
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/*
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* Formatting functions.
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*/
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#define MAX_INDENT 5
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static void _inc_indent(struct formatter *f)
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{
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if (++f->indent > MAX_INDENT)
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f->indent = MAX_INDENT;
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}
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static void _dec_indent(struct formatter *f)
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{
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if (!f->indent--) {
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log_error(INTERNAL_ERROR "problem tracking indentation");
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f->indent = 0;
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}
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}
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/*
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* Newline function for prettier layout.
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*/
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static int _nl_file(struct formatter *f)
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{
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fprintf(f->data.fp, "\n");
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return 1;
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}
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static int _extend_buffer(struct formatter *f)
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{
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char *newbuf;
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log_debug("Doubling metadata output buffer to %" PRIu32,
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f->data.buf.size * 2);
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if (!(newbuf = dm_realloc(f->data.buf.start,
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f->data.buf.size * 2))) {
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log_error("Buffer reallocation failed.");
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return 0;
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}
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f->data.buf.start = newbuf;
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f->data.buf.size *= 2;
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return 1;
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}
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static int _nl_raw(struct formatter *f)
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{
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/* If metadata doesn't fit, extend buffer */
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if ((f->data.buf.used + 2 > f->data.buf.size) &&
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(!_extend_buffer(f)))
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return_0;
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*(f->data.buf.start + f->data.buf.used) = '\n';
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f->data.buf.used += 1;
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*(f->data.buf.start + f->data.buf.used) = '\0';
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return 1;
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}
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#define COMMENT_TAB 6
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__attribute__((format(printf, 3, 0)))
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static int _out_with_comment_file(struct formatter *f, const char *comment,
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const char *fmt, va_list ap)
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{
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int i;
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char white_space[MAX_INDENT + 1];
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if (ferror(f->data.fp))
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return 0;
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for (i = 0; i < f->indent; i++)
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white_space[i] = '\t';
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white_space[i] = '\0';
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fputs(white_space, f->data.fp);
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i = vfprintf(f->data.fp, fmt, ap);
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if (comment) {
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/*
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* line comments up if possible.
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*/
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i += 8 * f->indent;
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i /= 8;
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i++;
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do
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fputc('\t', f->data.fp);
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while (++i < COMMENT_TAB);
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fputs(comment, f->data.fp);
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}
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fputc('\n', f->data.fp);
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return 1;
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}
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__attribute__((format(printf, 3, 0)))
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static int _out_with_comment_raw(struct formatter *f,
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const char *comment __attribute__((unused)),
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const char *fmt, va_list ap)
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{
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int n;
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n = vsnprintf(f->data.buf.start + f->data.buf.used,
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f->data.buf.size - f->data.buf.used, fmt, ap);
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/* If metadata doesn't fit, extend buffer */
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if (n < 0 || (n + f->data.buf.used + 2 > f->data.buf.size)) {
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if (!_extend_buffer(f))
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return_0;
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return -1; /* Retry */
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}
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f->data.buf.used += n;
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outnl(f);
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return 1;
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}
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/*
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* Formats a string, converting a size specified
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* in 512-byte sectors to a more human readable
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* form (eg, megabytes). We may want to lift this
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* for other code to use.
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*/
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static int _sectors_to_units(uint64_t sectors, char *buffer, size_t s)
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{
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static const char *_units[] = {
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"Kilobytes",
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"Megabytes",
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"Gigabytes",
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"Terabytes",
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"Petabytes",
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"Exabytes",
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NULL
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};
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int i;
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double d = (double) sectors;
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/* to convert to K */
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d /= 2.0;
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for (i = 0; (d > 1024.0) && _units[i]; i++)
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d /= 1024.0;
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return dm_snprintf(buffer, s, "# %g %s", d, _units[i]) > 0;
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}
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/* increment indention level */
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void out_inc_indent(struct formatter *f)
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{
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_inc_indent(f);
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}
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/* decrement indention level */
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void out_dec_indent(struct formatter *f)
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{
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_dec_indent(f);
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}
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/* insert new line */
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int out_newline(struct formatter *f)
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{
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return f->nl(f);
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}
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/*
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* Appends a comment giving a size in more easily
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* readable form (eg, 4M instead of 8096).
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*/
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int out_size(struct formatter *f, uint64_t size, const char *fmt, ...)
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{
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char buffer[64];
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va_list ap;
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int r;
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if (!_sectors_to_units(size, buffer, sizeof(buffer)))
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return 0;
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_out_with_comment(f, buffer, fmt, ap);
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return r;
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}
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/*
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* Appends a comment indicating that the line is
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* only a hint.
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*/
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int out_hint(struct formatter *f, const char *fmt, ...)
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{
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va_list ap;
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int r;
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_out_with_comment(f, "# Hint only", fmt, ap);
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return r;
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}
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/*
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* The normal output function with comment
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*/
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int out_text_with_comment(struct formatter *f, const char *comment, const char *fmt, ...)
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{
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va_list ap;
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int r;
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_out_with_comment(f, comment, fmt, ap);
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return r;
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}
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/*
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* The normal output function.
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*/
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int out_text(struct formatter *f, const char *fmt, ...)
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{
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va_list ap;
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int r;
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_out_with_comment(f, NULL, fmt, ap);
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return r;
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}
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static int _out_line(const char *line, void *_f) {
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struct formatter *f = (struct formatter *) _f;
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return out_text(f, "%s", line);
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}
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int out_config_node(struct formatter *f, const struct dm_config_node *cn)
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{
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return dm_config_write_node(cn, _out_line, f);
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}
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static int _print_header(struct formatter *f,
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const char *desc)
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{
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char *buf;
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time_t t;
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t = time(NULL);
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outf(f, "# Generated by LVM2 version %s: %s", LVM_VERSION, ctime(&t));
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outf(f, CONTENTS_FIELD " = \"" CONTENTS_VALUE "\"");
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outf(f, FORMAT_VERSION_FIELD " = %d", FORMAT_VERSION_VALUE);
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outnl(f);
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if (!(buf = alloca(dm_escaped_len(desc)))) {
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log_error("temporary stack allocation for description"
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"string failed");
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return 0;
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}
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outf(f, "description = \"%s\"", dm_escape_double_quotes(buf, desc));
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outnl(f);
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outf(f, "creation_host = \"%s\"\t# %s %s %s %s %s", _utsname.nodename,
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_utsname.sysname, _utsname.nodename, _utsname.release,
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_utsname.version, _utsname.machine);
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outf(f, "creation_time = %lu\t# %s", t, ctime(&t));
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return 1;
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}
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static int _print_flag_config(struct formatter *f, uint64_t status, int type)
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{
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char buffer[4096];
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if (!print_flags(status, type | STATUS_FLAG, buffer, sizeof(buffer)))
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return_0;
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outf(f, "status = %s", buffer);
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if (!print_flags(status, type, buffer, sizeof(buffer)))
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return_0;
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outf(f, "flags = %s", buffer);
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return 1;
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}
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static int _out_tags(struct formatter *f, struct dm_list *tags)
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{
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char *tag_buffer;
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if (!dm_list_empty(tags)) {
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if (!(tag_buffer = alloc_printed_tags(tags)))
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return_0;
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if (!out_text(f, "tags = %s", tag_buffer)) {
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dm_free(tag_buffer);
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return_0;
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}
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dm_free(tag_buffer);
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}
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return 1;
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}
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static int _print_vg(struct formatter *f, struct volume_group *vg)
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{
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char buffer[4096];
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if (!id_write_format(&vg->id, buffer, sizeof(buffer)))
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return_0;
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outf(f, "id = \"%s\"", buffer);
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outf(f, "seqno = %u", vg->seqno);
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if (!_print_flag_config(f, vg->status, VG_FLAGS))
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return_0;
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if (!_out_tags(f, &vg->tags))
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return_0;
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if (vg->system_id && *vg->system_id)
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outf(f, "system_id = \"%s\"", vg->system_id);
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outsize(f, (uint64_t) vg->extent_size, "extent_size = %u",
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vg->extent_size);
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outf(f, "max_lv = %u", vg->max_lv);
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outf(f, "max_pv = %u", vg->max_pv);
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/* Default policy is NORMAL; INHERIT is meaningless */
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if (vg->alloc != ALLOC_NORMAL && vg->alloc != ALLOC_INHERIT) {
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outnl(f);
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outf(f, "allocation_policy = \"%s\"",
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get_alloc_string(vg->alloc));
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}
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outf(f, "metadata_copies = %u", vg->mda_copies);
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return 1;
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}
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/*
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* Get the pv%d name from the formatters hash
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* table.
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*/
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static const char *_get_pv_name_from_uuid(struct formatter *f, char *uuid)
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{
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return dm_hash_lookup(f->pv_names, uuid);
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}
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static const char *_get_pv_name(struct formatter *f, struct physical_volume *pv)
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{
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char uuid[64] __attribute__((aligned(8)));
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if (!pv || !id_write_format(&pv->id, uuid, sizeof(uuid)))
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return_NULL;
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return _get_pv_name_from_uuid(f, uuid);
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}
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static int _print_pvs(struct formatter *f, struct volume_group *vg)
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{
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struct pv_list *pvl;
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struct physical_volume *pv;
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char buffer[4096];
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char *buf;
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const char *name;
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outf(f, "physical_volumes {");
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_inc_indent(f);
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dm_list_iterate_items(pvl, &vg->pvs) {
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pv = pvl->pv;
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if (!id_write_format(&pv->id, buffer, sizeof(buffer)))
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return_0;
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if (!(name = _get_pv_name_from_uuid(f, buffer)))
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return_0;
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outnl(f);
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outf(f, "%s {", name);
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_inc_indent(f);
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outf(f, "id = \"%s\"", buffer);
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if (!(buf = alloca(dm_escaped_len(pv_dev_name(pv))))) {
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log_error("temporary stack allocation for device name"
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"string failed");
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return 0;
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}
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outhint(f, "device = \"%s\"",
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dm_escape_double_quotes(buf, pv_dev_name(pv)));
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outnl(f);
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if (!_print_flag_config(f, pv->status, PV_FLAGS))
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return_0;
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if (!_out_tags(f, &pv->tags))
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return_0;
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outsize(f, pv->size, "dev_size = %" PRIu64, pv->size);
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outf(f, "pe_start = %" PRIu64, pv->pe_start);
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outsize(f, vg->extent_size * (uint64_t) pv->pe_count,
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"pe_count = %u", pv->pe_count);
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_dec_indent(f);
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outf(f, "}");
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}
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_dec_indent(f);
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outf(f, "}");
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return 1;
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}
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static int _print_segment(struct formatter *f, struct volume_group *vg,
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int count, struct lv_segment *seg)
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{
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outf(f, "segment%u {", count);
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_inc_indent(f);
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outf(f, "start_extent = %u", seg->le);
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outsize(f, (uint64_t) seg->len * vg->extent_size,
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"extent_count = %u", seg->len);
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outnl(f);
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outf(f, "type = \"%s\"", seg->segtype->name);
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if (!_out_tags(f, &seg->tags))
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return_0;
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if (seg->segtype->ops->text_export &&
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!seg->segtype->ops->text_export(seg, f))
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return_0;
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_dec_indent(f);
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outf(f, "}");
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return 1;
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}
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int out_areas(struct formatter *f, const struct lv_segment *seg,
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const char *type)
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{
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const char *name;
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unsigned int s;
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outnl(f);
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outf(f, "%ss = [", type);
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_inc_indent(f);
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for (s = 0; s < seg->area_count; s++) {
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switch (seg_type(seg, s)) {
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case AREA_PV:
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if (!(name = _get_pv_name(f, seg_pv(seg, s))))
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return_0;
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outf(f, "\"%s\", %u%s", name,
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seg_pe(seg, s),
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(s == seg->area_count - 1) ? "" : ",");
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break;
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case AREA_LV:
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if (!(seg->status & RAID)) {
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outf(f, "\"%s\", %u%s",
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seg_lv(seg, s)->name,
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seg_le(seg, s),
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(s == seg->area_count - 1) ? "" : ",");
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|
continue;
|
|
}
|
|
|
|
/* RAID devices are laid-out in metadata/data pairs */
|
|
if (!(seg_lv(seg, s)->status & RAID_IMAGE) ||
|
|
!(seg_metalv(seg, s)->status & RAID_META)) {
|
|
log_error("RAID segment has non-RAID areas");
|
|
return 0;
|
|
}
|
|
|
|
outf(f, "\"%s\", \"%s\"%s",
|
|
seg_metalv(seg, s)->name, seg_lv(seg, s)->name,
|
|
(s == seg->area_count - 1) ? "" : ",");
|
|
|
|
break;
|
|
case AREA_UNASSIGNED:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
_dec_indent(f);
|
|
outf(f, "]");
|
|
return 1;
|
|
}
|
|
|
|
static int _print_lv(struct formatter *f, struct logical_volume *lv)
|
|
{
|
|
struct lv_segment *seg;
|
|
char buffer[4096];
|
|
int seg_count;
|
|
struct tm *local_tm;
|
|
time_t ts;
|
|
|
|
outnl(f);
|
|
outf(f, "%s {", lv->name);
|
|
_inc_indent(f);
|
|
|
|
/* FIXME: Write full lvid */
|
|
if (!id_write_format(&lv->lvid.id[1], buffer, sizeof(buffer)))
|
|
return_0;
|
|
|
|
outf(f, "id = \"%s\"", buffer);
|
|
|
|
if (!_print_flag_config(f, lv->status, LV_FLAGS))
|
|
return_0;
|
|
|
|
if (!_out_tags(f, &lv->tags))
|
|
return_0;
|
|
|
|
if (lv->timestamp) {
|
|
ts = (time_t)lv->timestamp;
|
|
strncpy(buffer, "# ", sizeof(buffer));
|
|
if (!(local_tm = localtime(&ts)) ||
|
|
!strftime(buffer + 2, sizeof(buffer) - 2,
|
|
"%Y-%m-%d %T %z", local_tm))
|
|
buffer[0] = 0;
|
|
|
|
outf(f, "creation_host = \"%s\"", lv->hostname);
|
|
outfc(f, buffer, "creation_time = %" PRIu64,
|
|
lv->timestamp);
|
|
}
|
|
|
|
if (lv->alloc != ALLOC_INHERIT)
|
|
outf(f, "allocation_policy = \"%s\"",
|
|
get_alloc_string(lv->alloc));
|
|
|
|
switch (lv->read_ahead) {
|
|
case DM_READ_AHEAD_NONE:
|
|
outfc(f, "# None", "read_ahead = -1");
|
|
break;
|
|
case DM_READ_AHEAD_AUTO:
|
|
/* No output - use default */
|
|
break;
|
|
default:
|
|
outf(f, "read_ahead = %u", lv->read_ahead);
|
|
}
|
|
|
|
if (lv->major >= 0)
|
|
outf(f, "major = %d", lv->major);
|
|
if (lv->minor >= 0)
|
|
outf(f, "minor = %d", lv->minor);
|
|
outf(f, "segment_count = %u", dm_list_size(&lv->segments));
|
|
outnl(f);
|
|
|
|
seg_count = 1;
|
|
dm_list_iterate_items(seg, &lv->segments) {
|
|
if (!_print_segment(f, lv->vg, seg_count++, seg))
|
|
return_0;
|
|
}
|
|
|
|
_dec_indent(f);
|
|
outf(f, "}");
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _print_lvs(struct formatter *f, struct volume_group *vg)
|
|
{
|
|
struct lv_list *lvl;
|
|
|
|
/*
|
|
* Don't bother with an lv section if there are no lvs.
|
|
*/
|
|
if (dm_list_empty(&vg->lvs))
|
|
return 1;
|
|
|
|
outf(f, "logical_volumes {");
|
|
_inc_indent(f);
|
|
|
|
/*
|
|
* Write visible LVs first
|
|
*/
|
|
dm_list_iterate_items(lvl, &vg->lvs) {
|
|
if (!(lv_is_visible(lvl->lv)))
|
|
continue;
|
|
if (!_print_lv(f, lvl->lv))
|
|
return_0;
|
|
}
|
|
|
|
dm_list_iterate_items(lvl, &vg->lvs) {
|
|
if ((lv_is_visible(lvl->lv)))
|
|
continue;
|
|
if (!_print_lv(f, lvl->lv))
|
|
return_0;
|
|
}
|
|
|
|
_dec_indent(f);
|
|
outf(f, "}");
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* In the text format we refer to pv's as 'pv1',
|
|
* 'pv2' etc. This function builds a hash table
|
|
* to enable a quick lookup from device -> name.
|
|
*/
|
|
static int _build_pv_names(struct formatter *f, struct volume_group *vg)
|
|
{
|
|
int count = 0;
|
|
struct pv_list *pvl;
|
|
struct physical_volume *pv;
|
|
char buffer[32], *uuid, *name;
|
|
|
|
if (!(f->mem = dm_pool_create("text pv_names", 512)))
|
|
return_0;
|
|
|
|
if (!(f->pv_names = dm_hash_create(128)))
|
|
return_0;
|
|
|
|
dm_list_iterate_items(pvl, &vg->pvs) {
|
|
pv = pvl->pv;
|
|
|
|
/* FIXME But skip if there's already an LV called pv%d ! */
|
|
if (dm_snprintf(buffer, sizeof(buffer), "pv%d", count++) < 0)
|
|
return_0;
|
|
|
|
if (!(name = dm_pool_strdup(f->mem, buffer)))
|
|
return_0;
|
|
|
|
if (!(uuid = dm_pool_zalloc(f->mem, 64)) ||
|
|
!id_write_format(&pv->id, uuid, 64))
|
|
return_0;
|
|
|
|
if (!dm_hash_insert(f->pv_names, uuid, name))
|
|
return_0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _text_vg_export(struct formatter *f,
|
|
struct volume_group *vg, const char *desc)
|
|
{
|
|
int r = 0;
|
|
|
|
if (!_build_pv_names(f, vg))
|
|
goto_out;
|
|
|
|
if (f->header && !_print_header(f, desc))
|
|
goto_out;
|
|
|
|
if (!out_text(f, "%s {", vg->name))
|
|
goto_out;
|
|
|
|
_inc_indent(f);
|
|
|
|
if (!_print_vg(f, vg))
|
|
goto_out;
|
|
|
|
outnl(f);
|
|
if (!_print_pvs(f, vg))
|
|
goto_out;
|
|
|
|
outnl(f);
|
|
if (!_print_lvs(f, vg))
|
|
goto_out;
|
|
|
|
_dec_indent(f);
|
|
if (!out_text(f, "}"))
|
|
goto_out;
|
|
|
|
if (!f->header && !_print_header(f, desc))
|
|
goto_out;
|
|
|
|
r = 1;
|
|
|
|
out:
|
|
if (f->mem)
|
|
dm_pool_destroy(f->mem);
|
|
|
|
if (f->pv_names)
|
|
dm_hash_destroy(f->pv_names);
|
|
|
|
return r;
|
|
}
|
|
|
|
int text_vg_export_file(struct volume_group *vg, const char *desc, FILE *fp)
|
|
{
|
|
struct formatter *f;
|
|
int r;
|
|
|
|
_init();
|
|
|
|
if (!(f = dm_zalloc(sizeof(*f))))
|
|
return_0;
|
|
|
|
f->data.fp = fp;
|
|
f->indent = 0;
|
|
f->header = 1;
|
|
f->out_with_comment = &_out_with_comment_file;
|
|
f->nl = &_nl_file;
|
|
|
|
r = _text_vg_export(f, vg, desc);
|
|
if (r)
|
|
r = !ferror(f->data.fp);
|
|
dm_free(f);
|
|
return r;
|
|
}
|
|
|
|
/* Returns amount of buffer used incl. terminating NUL */
|
|
size_t text_vg_export_raw(struct volume_group *vg, const char *desc, char **buf)
|
|
{
|
|
struct formatter *f;
|
|
size_t r = 0;
|
|
|
|
_init();
|
|
|
|
if (!(f = dm_zalloc(sizeof(*f))))
|
|
return_0;
|
|
|
|
f->data.buf.size = 65536; /* Initial metadata limit */
|
|
if (!(f->data.buf.start = dm_malloc(f->data.buf.size))) {
|
|
log_error("text_export buffer allocation failed");
|
|
goto out;
|
|
}
|
|
|
|
f->indent = 0;
|
|
f->header = 0;
|
|
f->out_with_comment = &_out_with_comment_raw;
|
|
f->nl = &_nl_raw;
|
|
|
|
if (!_text_vg_export(f, vg, desc)) {
|
|
dm_free(f->data.buf.start);
|
|
goto_out;
|
|
}
|
|
|
|
r = f->data.buf.used + 1;
|
|
*buf = f->data.buf.start;
|
|
|
|
out:
|
|
dm_free(f);
|
|
return r;
|
|
}
|
|
|
|
size_t export_vg_to_buffer(struct volume_group *vg, char **buf)
|
|
{
|
|
return text_vg_export_raw(vg, "", buf);
|
|
}
|
|
|
|
#undef outf
|
|
#undef outnl
|