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e2fsprogs/lib/e2p/feature.c
Darrick J. Wong 2ed0adbce6 libext2fs: store checksum seed in superblock 
Allow the filesystem to store the metadata checksum seed in the
superblock and add an incompat feature to say that we're using it.
This enables tune2fs to change the UUID on a mounted metadata_csum
FS without having to (racy!) rewrite all disk metadata.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2016-03-06 20:08:52 -05:00

424 lines
9.8 KiB
C
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/*
* feature.c --- convert between features and strings
*
* Copyright (C) 1999 Theodore Ts'o <tytso@mit.edu>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "e2p.h"
#include <ext2fs/ext2fs.h>
#include <ext2fs/kernel-jbd.h>
struct feature {
int compat;
unsigned int mask;
const char *string;
};
static struct feature feature_list[] = {
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_PREALLOC,
"dir_prealloc" },
{ E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
"has_journal" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
"imagic_inodes" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
"ext_attr" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX,
"dir_index" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
"resize_inode" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
"lazy_bg" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
"snapshot_bitmap" },
{ E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_SPARSE_SUPER2,
"sparse_super2" },
{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
"sparse_super" },
{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
"large_file" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_HUGE_FILE,
"huge_file" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
"uninit_bg" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
"uninit_groups" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_DIR_NLINK,
"dir_nlink" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE,
"extra_isize" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
"quota" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
"bigalloc"},
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM,
"metadata_csum"},
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_REPLICA,
"replica" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_READONLY,
"read-only" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_PROJECT,
"project"},
{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
"compression" },
{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_FILETYPE,
"filetype" },
{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_RECOVER,
"needs_recovery" },
{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_JOURNAL_DEV,
"journal_dev" },
{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
"extent" },
{ E2P_FEATURE_INCOMPAT, EXT3_FEATURE_INCOMPAT_EXTENTS,
"extents" },
{ E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_META_BG,
"meta_bg" },
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_64BIT,
"64bit" },
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_MMP,
"mmp" },
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
"flex_bg"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_EA_INODE,
"ea_inode"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_DIRDATA,
"dirdata"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_CSUM_SEED,
"metadata_csum_seed"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_LARGEDIR,
"large_dir"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_INLINE_DATA,
"inline_data"},
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_ENCRYPT,
"encrypt"},
{ 0, 0, 0 },
};
static struct feature jrnl_feature_list[] = {
{ E2P_FEATURE_COMPAT, JFS_FEATURE_COMPAT_CHECKSUM,
"journal_checksum" },
{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_REVOKE,
"journal_incompat_revoke" },
{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_64BIT,
"journal_64bit" },
{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_ASYNC_COMMIT,
"journal_async_commit" },
{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V2,
"journal_checksum_v2" },
{ E2P_FEATURE_INCOMPAT, JFS_FEATURE_INCOMPAT_CSUM_V3,
"journal_checksum_v3" },
{ 0, 0, 0 },
};
const char *e2p_feature2string(int compat, unsigned int mask)
{
struct feature *f;
static char buf[20];
char fchar;
int fnum;
for (f = feature_list; f->string; f++) {
if ((compat == f->compat) &&
(mask == f->mask))
return f->string;
}
switch (compat) {
case E2P_FEATURE_COMPAT:
fchar = 'C';
break;
case E2P_FEATURE_INCOMPAT:
fchar = 'I';
break;
case E2P_FEATURE_RO_INCOMPAT:
fchar = 'R';
break;
default:
fchar = '?';
break;
}
for (fnum = 0; mask >>= 1; fnum++);
sprintf(buf, "FEATURE_%c%d", fchar, fnum);
return buf;
}
int e2p_string2feature(char *string, int *compat_type, unsigned int *mask)
{
struct feature *f;
char *eptr;
int num;
for (f = feature_list; f->string; f++) {
if (!strcasecmp(string, f->string)) {
*compat_type = f->compat;
*mask = f->mask;
return 0;
}
}
if (strncasecmp(string, "FEATURE_", 8))
return 1;
switch (string[8]) {
case 'c':
case 'C':
*compat_type = E2P_FEATURE_COMPAT;
break;
case 'i':
case 'I':
*compat_type = E2P_FEATURE_INCOMPAT;
break;
case 'r':
case 'R':
*compat_type = E2P_FEATURE_RO_INCOMPAT;
break;
default:
return 1;
}
if (string[9] == 0)
return 1;
num = strtol(string+9, &eptr, 10);
if (num > 31 || num < 0)
return 1;
if (*eptr)
return 1;
*mask = 1 << num;
return 0;
}
const char *e2p_jrnl_feature2string(int compat, unsigned int mask)
{
struct feature *f;
static char buf[20];
char fchar;
int fnum;
for (f = jrnl_feature_list; f->string; f++) {
if ((compat == f->compat) &&
(mask == f->mask))
return f->string;
}
switch (compat) {
case E2P_FEATURE_COMPAT:
fchar = 'C';
break;
case E2P_FEATURE_INCOMPAT:
fchar = 'I';
break;
case E2P_FEATURE_RO_INCOMPAT:
fchar = 'R';
break;
default:
fchar = '?';
break;
}
for (fnum = 0; mask >>= 1; fnum++);
sprintf(buf, "FEATURE_%c%d", fchar, fnum);
return buf;
}
int e2p_jrnl_string2feature(char *string, int *compat_type, unsigned int *mask)
{
struct feature *f;
char *eptr;
int num;
for (f = jrnl_feature_list; f->string; f++) {
if (!strcasecmp(string, f->string)) {
*compat_type = f->compat;
*mask = f->mask;
return 0;
}
}
if (strncasecmp(string, "FEATURE_", 8))
return 1;
switch (string[8]) {
case 'c':
case 'C':
*compat_type = E2P_FEATURE_COMPAT;
break;
case 'i':
case 'I':
*compat_type = E2P_FEATURE_INCOMPAT;
break;
case 'r':
case 'R':
*compat_type = E2P_FEATURE_RO_INCOMPAT;
break;
default:
return 1;
}
if (string[9] == 0)
return 1;
num = strtol(string+9, &eptr, 10);
if (num > 31 || num < 0)
return 1;
if (*eptr)
return 1;
*mask = 1 << num;
return 0;
}
static char *skip_over_blanks(char *cp)
{
while (*cp && isspace(*cp))
cp++;
return cp;
}
static char *skip_over_word(char *cp)
{
while (*cp && !isspace(*cp) && *cp != ',')
cp++;
return cp;
}
/*
* Edit a feature set array as requested by the user. The ok_array,
* if set, allows the application to limit what features the user is
* allowed to set or clear using this function. If clear_ok_array is set,
* then use it tell whether or not it is OK to clear a filesystem feature.
*/
int e2p_edit_feature2(const char *str, __u32 *compat_array, __u32 *ok_array,
__u32 *clear_ok_array, int *type_err,
unsigned int *mask_err)
{
char *cp, *buf, *next;
int neg;
unsigned int mask;
int compat_type;
int rc = 0;
if (!clear_ok_array)
clear_ok_array = ok_array;
if (type_err)
*type_err = 0;
if (mask_err)
*mask_err = 0;
buf = malloc(strlen(str)+1);
if (!buf)
return 1;
strcpy(buf, str);
for (cp = buf; cp && *cp; cp = next ? next+1 : 0) {
neg = 0;
cp = skip_over_blanks(cp);
next = skip_over_word(cp);
if (*next == 0)
next = 0;
else
*next = 0;
if ((strcasecmp(cp, "none") == 0) ||
(strcasecmp(cp, "clear") == 0)) {
compat_array[0] = 0;
compat_array[1] = 0;
compat_array[2] = 0;
continue;
}
switch (*cp) {
case '-':
case '^':
neg++;
/* fallthrough */
case '+':
cp++;
break;
}
if (e2p_string2feature(cp, &compat_type, &mask)) {
rc = 1;
break;
}
if (neg) {
if (clear_ok_array &&
!(clear_ok_array[compat_type] & mask)) {
rc = 1;
if (type_err)
*type_err = (compat_type |
E2P_FEATURE_NEGATE_FLAG);
if (mask_err)
*mask_err = mask;
break;
}
compat_array[compat_type] &= ~mask;
} else {
if (ok_array && !(ok_array[compat_type] & mask)) {
rc = 1;
if (type_err)
*type_err = compat_type;
if (mask_err)
*mask_err = mask;
break;
}
compat_array[compat_type] |= mask;
}
}
free(buf);
return rc;
}
int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
{
return e2p_edit_feature2(str, compat_array, ok_array, 0, 0, 0);
}
#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
int compat, compat2, i;
unsigned int mask, mask2;
const char *str;
struct feature *f;
for (i = 0; i < 2; i++) {
if (i == 0) {
f = feature_list;
printf("Feature list:\n");
} else {
printf("\nJournal feature list:\n");
f = jrnl_feature_list;
}
for (; f->string; f++) {
if (i == 0) {
e2p_string2feature((char *)f->string, &compat,
&mask);
str = e2p_feature2string(compat, mask);
} else {
e2p_jrnl_string2feature((char *)f->string,
&compat, &mask);
str = e2p_jrnl_feature2string(compat, mask);
}
printf("\tCompat = %d, Mask = %u, %s\n",
compat, mask, f->string);
if (strcmp(f->string, str)) {
if (e2p_string2feature((char *) str, &compat2,
&mask2) ||
(compat2 != compat) ||
(mask2 != mask)) {
fprintf(stderr, "Failure!\n");
exit(1);
}
}
}
}
exit(0);
}
#endif
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