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fsfeatures.c
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fsfeatures.c
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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 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.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "kerncompat.h"
#include <sys/utsname.h>
#include <linux/version.h>
#include "fsfeatures.h"
#include "ctree.h"
#include "utils.h"
/*
* Insert a root item for temporary tree root
*
* Only used in make_btrfs_v2().
*/
#define VERSION_TO_STRING3(a,b,c) #a "." #b "." #c, KERNEL_VERSION(a,b,c)
#define VERSION_TO_STRING2(a,b) #a "." #b, KERNEL_VERSION(a,b,0)
/*
* Feature stability status and versions: compat <= safe <= default
*/
static const struct btrfs_fs_feature {
const char *name;
u64 flag;
const char *sysfs_name;
/*
* Compatibility with kernel of given version. Filesystem can be
* mounted.
*/
const char *compat_str;
u32 compat_ver;
/*
* Considered safe for use, but is not on by default, even if the
* kernel supports the feature.
*/
const char *safe_str;
u32 safe_ver;
/*
* Considered safe for use and will be turned on by default if
* supported by the running kernel.
*/
const char *default_str;
u32 default_ver;
const char *desc;
} mkfs_features[] = {
{ "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
"mixed_groups",
VERSION_TO_STRING3(2,6,37),
VERSION_TO_STRING3(2,6,37),
NULL, 0,
"mixed data and metadata block groups" },
{ "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
"extended_iref",
VERSION_TO_STRING2(3,7),
VERSION_TO_STRING2(3,12),
VERSION_TO_STRING2(3,12),
"increased hardlink limit per file to 65536" },
{ "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
"raid56",
VERSION_TO_STRING2(3,9),
NULL, 0,
NULL, 0,
"raid56 extended format" },
{ "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
"skinny_metadata",
VERSION_TO_STRING2(3,10),
VERSION_TO_STRING2(3,18),
VERSION_TO_STRING2(3,18),
"reduced-size metadata extent refs" },
{ "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
"no_holes",
VERSION_TO_STRING2(3,14),
VERSION_TO_STRING2(4,0),
NULL, 0,
"no explicit hole extents for files" },
/* Keep this one last */
{ "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
};
static int parse_one_fs_feature(const char *name, u64 *flags)
{
int i;
int found = 0;
for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
if (name[0] == '^' &&
!strcmp(mkfs_features[i].name, name + 1)) {
*flags &= ~ mkfs_features[i].flag;
found = 1;
} else if (!strcmp(mkfs_features[i].name, name)) {
*flags |= mkfs_features[i].flag;
found = 1;
}
}
return !found;
}
void btrfs_parse_features_to_string(char *buf, u64 flags)
{
int i;
buf[0] = 0;
for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
if (flags & mkfs_features[i].flag) {
if (*buf)
strcat(buf, ", ");
strcat(buf, mkfs_features[i].name);
}
}
}
void btrfs_process_fs_features(u64 flags)
{
int i;
for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
if (flags & mkfs_features[i].flag) {
printf("Turning ON incompat feature '%s': %s\n",
mkfs_features[i].name,
mkfs_features[i].desc);
}
}
}
void btrfs_list_all_fs_features(u64 mask_disallowed)
{
int i;
fprintf(stderr, "Filesystem features available:\n");
for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
const struct btrfs_fs_feature *feat = &mkfs_features[i];
if (feat->flag & mask_disallowed)
continue;
fprintf(stderr, "%-20s- %s (0x%llx", feat->name, feat->desc,
feat->flag);
if (feat->compat_ver)
fprintf(stderr, ", compat=%s", feat->compat_str);
if (feat->safe_ver)
fprintf(stderr, ", safe=%s", feat->safe_str);
if (feat->default_ver)
fprintf(stderr, ", default=%s", feat->default_str);
fprintf(stderr, ")\n");
}
}
/*
* Return NULL if all features were parsed fine, otherwise return the name of
* the first unparsed.
*/
char* btrfs_parse_fs_features(char *namelist, u64 *flags)
{
char *this_char;
char *save_ptr = NULL; /* Satisfy static checkers */
for (this_char = strtok_r(namelist, ",", &save_ptr);
this_char != NULL;
this_char = strtok_r(NULL, ",", &save_ptr)) {
if (parse_one_fs_feature(this_char, flags))
return this_char;
}
return NULL;
}
void print_kernel_version(FILE *stream, u32 version)
{
u32 v[3];
v[0] = version & 0xFF;
v[1] = (version >> 8) & 0xFF;
v[2] = version >> 16;
fprintf(stream, "%u.%u", v[2], v[1]);
if (v[0])
fprintf(stream, ".%u", v[0]);
}
u32 get_running_kernel_version(void)
{
struct utsname utsbuf;
char *tmp;
char *saveptr = NULL;
u32 version;
uname(&utsbuf);
if (strcmp(utsbuf.sysname, "Linux") != 0) {
error("unsupported system: %s", utsbuf.sysname);
exit(1);
}
/* 1.2.3-4-name */
tmp = strchr(utsbuf.release, '-');
if (tmp)
*tmp = 0;
tmp = strtok_r(utsbuf.release, ".", &saveptr);
if (!string_is_numerical(tmp))
return (u32)-1;
version = atoi(tmp) << 16;
tmp = strtok_r(NULL, ".", &saveptr);
if (!string_is_numerical(tmp))
return (u32)-1;
version |= atoi(tmp) << 8;
tmp = strtok_r(NULL, ".", &saveptr);
if (tmp) {
if (!string_is_numerical(tmp))
return (u32)-1;
version |= atoi(tmp);
}
return version;
}
int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
{
if (nodesize < sectorsize) {
error("illegal nodesize %u (smaller than %u)",
nodesize, sectorsize);
return -1;
} else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
error("illegal nodesize %u (larger than %u)",
nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
return -1;
} else if (nodesize & (sectorsize - 1)) {
error("illegal nodesize %u (not aligned to %u)",
nodesize, sectorsize);
return -1;
} else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
nodesize != sectorsize) {
error(
"illegal nodesize %u (not equal to %u for mixed block group)",
nodesize, sectorsize);
return -1;
}
return 0;
}