525 lines
13 KiB
C
525 lines
13 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <sys/utsname.h>
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#include <sys/ioctl.h>
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#include <linux/version.h>
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#include <unistd.h>
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#include "common/fsfeatures.h"
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#include "kernel-shared/ctree.h"
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#include "common/utils.h"
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/*
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* Insert a root item for temporary tree root
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*
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* Only used in make_btrfs_v2().
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*/
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#define VERSION_TO_STRING3(name, a,b,c) \
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.name ## _str = #a "." #b "." #c, \
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.name ## _ver = KERNEL_VERSION(a,b,c)
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#define VERSION_TO_STRING2(name, a,b) \
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.name ## _str = #a "." #b, \
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.name ## _ver = KERNEL_VERSION(a,b,0)
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#define VERSION_NULL(name) \
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.name ## _str = NULL, \
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.name ## _ver = 0
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enum feature_source {
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FS_FEATURES,
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RUNTIME_FEATURES,
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};
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/*
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* Feature stability status and versions: compat <= safe <= default
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*/
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struct btrfs_feature {
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const char *name;
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u64 flag;
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const char *sysfs_name;
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/*
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* Compatibility with kernel of given version. Filesystem can be
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* mounted.
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*/
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const char *compat_str;
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u32 compat_ver;
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/*
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* Considered safe for use, but is not on by default, even if the
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* kernel supports the feature.
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*/
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const char *safe_str;
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u32 safe_ver;
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/*
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* Considered safe for use and will be turned on by default if
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* supported by the running kernel.
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*/
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const char *default_str;
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u32 default_ver;
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const char *desc;
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};
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static const struct btrfs_feature mkfs_features[] = {
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{
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.name = "mixed-bg",
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.flag = BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
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.sysfs_name = "mixed_groups",
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VERSION_TO_STRING3(compat, 2,6,37),
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VERSION_TO_STRING3(safe, 2,6,37),
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VERSION_NULL(default),
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.desc = "mixed data and metadata block groups"
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}, {
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.name = "extref",
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.flag = BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
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.sysfs_name = "extended_iref",
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VERSION_TO_STRING2(compat, 3,7),
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VERSION_TO_STRING2(safe, 3,12),
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VERSION_TO_STRING2(default, 3,12),
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.desc = "increased hardlink limit per file to 65536"
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}, {
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.name = "raid56",
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.flag = BTRFS_FEATURE_INCOMPAT_RAID56,
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.sysfs_name = "raid56",
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VERSION_TO_STRING2(compat, 3,9),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = "raid56 extended format"
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}, {
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.name = "skinny-metadata",
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.flag = BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
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.sysfs_name = "skinny_metadata",
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VERSION_TO_STRING2(compat, 3,10),
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VERSION_TO_STRING2(safe, 3,18),
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VERSION_TO_STRING2(default, 3,18),
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.desc = "reduced-size metadata extent refs"
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}, {
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.name = "no-holes",
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.flag = BTRFS_FEATURE_INCOMPAT_NO_HOLES,
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.sysfs_name = "no_holes",
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VERSION_TO_STRING2(compat, 3,14),
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VERSION_TO_STRING2(safe, 4,0),
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VERSION_TO_STRING2(default, 5,15),
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.desc = "no explicit hole extents for files"
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}, {
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.name = "raid1c34",
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.flag = BTRFS_FEATURE_INCOMPAT_RAID1C34,
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.sysfs_name = "raid1c34",
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VERSION_TO_STRING2(compat, 5,5),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = "RAID1 with 3 or 4 copies"
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},
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#ifdef BTRFS_ZONED
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{
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.name = "zoned",
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.flag = BTRFS_FEATURE_INCOMPAT_ZONED,
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.sysfs_name = "zoned",
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VERSION_TO_STRING2(compat, 5,12),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = "support zoned devices"
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},
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#endif
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#if EXPERIMENTAL
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{
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.name = "extent-tree-v2",
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.flag = BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2,
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.sysfs_name = "extent_tree_v2",
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VERSION_TO_STRING2(compat, 5,15),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = "new extent tree format"
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},
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#endif
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/* Keep this one last */
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{
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.name = "list-all",
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.flag = BTRFS_FEATURE_LIST_ALL,
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.sysfs_name = NULL,
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VERSION_NULL(compat),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = NULL
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}
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};
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static const struct btrfs_feature runtime_features[] = {
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{
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.name = "quota",
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.flag = BTRFS_RUNTIME_FEATURE_QUOTA,
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.sysfs_name = NULL,
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VERSION_TO_STRING2(compat, 3,4),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = "quota support (qgroups)"
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}, {
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.name = "free-space-tree",
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.flag = BTRFS_RUNTIME_FEATURE_FREE_SPACE_TREE,
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.sysfs_name = "free_space_tree",
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VERSION_TO_STRING2(compat, 4,5),
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VERSION_TO_STRING2(safe, 4,9),
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VERSION_TO_STRING2(default, 5,15),
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.desc = "free space tree (space_cache=v2)"
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},
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/* Keep this one last */
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{
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.name = "list-all",
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.flag = BTRFS_FEATURE_LIST_ALL,
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.sysfs_name = NULL,
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VERSION_NULL(compat),
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VERSION_NULL(safe),
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VERSION_NULL(default),
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.desc = NULL
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}
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};
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static size_t get_feature_array_size(enum feature_source source)
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{
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if (source == FS_FEATURES)
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return ARRAY_SIZE(mkfs_features);
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if (source == RUNTIME_FEATURES)
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return ARRAY_SIZE(runtime_features);
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return 0;
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}
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static const struct btrfs_feature *get_feature(int i, enum feature_source source)
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{
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if (source == FS_FEATURES)
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return &mkfs_features[i];
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if (source == RUNTIME_FEATURES)
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return &runtime_features[i];
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return NULL;
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}
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static int parse_one_fs_feature(const char *name, u64 *flags,
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enum feature_source source)
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{
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const int array_size = get_feature_array_size(source);
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int i;
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int found = 0;
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for (i = 0; i < array_size; i++) {
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const struct btrfs_feature *feat = get_feature(i, source);
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if (name[0] == '^' && !strcmp(feat->name, name + 1)) {
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*flags &= ~feat->flag;
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found = 1;
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} else if (!strcmp(feat->name, name)) {
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*flags |= feat->flag;
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found = 1;
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}
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}
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return !found;
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}
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static void parse_features_to_string(char *buf, u64 flags,
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enum feature_source source)
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{
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const int array_size = get_feature_array_size(source);
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int i;
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buf[0] = 0;
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for (i = 0; i < array_size; i++) {
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const struct btrfs_feature *feat = get_feature(i, source);
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if (flags & feat->flag) {
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if (*buf)
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strcat(buf, ", ");
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strcat(buf, feat->name);
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}
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}
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}
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void btrfs_parse_fs_features_to_string(char *buf, u64 flags)
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{
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parse_features_to_string(buf, flags, FS_FEATURES);
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}
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void btrfs_parse_runtime_features_to_string(char *buf, u64 flags)
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{
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parse_features_to_string(buf, flags, RUNTIME_FEATURES);
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}
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static void process_features(u64 flags, enum feature_source source)
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{
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const int array_size = get_feature_array_size(source);
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int i;
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for (i = 0; i < array_size; i++) {
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const struct btrfs_feature *feat = get_feature(i, source);
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if (flags & feat->flag && feat->name && feat->desc) {
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printf("Turning ON incompat feature '%s': %s\n",
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feat->name, feat->desc);
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}
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}
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}
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void btrfs_process_fs_features(u64 flags)
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{
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process_features(flags, FS_FEATURES);
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}
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void btrfs_process_runtime_features(u64 flags)
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{
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process_features(flags, RUNTIME_FEATURES);
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}
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static void list_all_features(u64 mask_disallowed, enum feature_source source)
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{
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const int array_size = get_feature_array_size(source);
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int i;
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char *prefix;
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if (source == FS_FEATURES)
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prefix = "Filesystem";
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else if (source == RUNTIME_FEATURES)
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prefix = "Runtime";
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else
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prefix = "UNKNOWN";
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fprintf(stderr, "%s features available:\n", prefix);
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for (i = 0; i < array_size - 1; i++) {
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const struct btrfs_feature *feat = get_feature(i, source);
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if (feat->flag & mask_disallowed)
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continue;
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fprintf(stderr, "%-20s- %s (0x%llx", feat->name, feat->desc,
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feat->flag);
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if (feat->compat_ver)
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fprintf(stderr, ", compat=%s", feat->compat_str);
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if (feat->safe_ver)
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fprintf(stderr, ", safe=%s", feat->safe_str);
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if (feat->default_ver)
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fprintf(stderr, ", default=%s", feat->default_str);
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fprintf(stderr, ")\n");
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}
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}
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void btrfs_list_all_fs_features(u64 mask_disallowed)
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{
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list_all_features(mask_disallowed, FS_FEATURES);
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}
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void btrfs_list_all_runtime_features(u64 mask_disallowed)
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{
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list_all_features(mask_disallowed, RUNTIME_FEATURES);
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}
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/*
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* Return NULL if all features were parsed fine, otherwise return the name of
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* the first unparsed.
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*/
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static char *parse_features(char *namelist, u64 *flags,
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enum feature_source source)
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{
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char *this_char;
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char *save_ptr = NULL; /* Satisfy static checkers */
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for (this_char = strtok_r(namelist, ",", &save_ptr);
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this_char != NULL;
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this_char = strtok_r(NULL, ",", &save_ptr)) {
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if (parse_one_fs_feature(this_char, flags, source))
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return this_char;
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}
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return NULL;
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}
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char *btrfs_parse_fs_features(char *namelist, u64 *flags)
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{
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return parse_features(namelist, flags, FS_FEATURES);
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}
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char *btrfs_parse_runtime_features(char *namelist, u64 *flags)
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{
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return parse_features(namelist, flags, RUNTIME_FEATURES);
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}
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void print_kernel_version(FILE *stream, u32 version)
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{
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u32 v[3];
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v[0] = version & 0xFF;
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v[1] = (version >> 8) & 0xFF;
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v[2] = version >> 16;
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fprintf(stream, "%u.%u", v[2], v[1]);
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if (v[0])
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fprintf(stream, ".%u", v[0]);
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}
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u32 get_running_kernel_version(void)
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{
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struct utsname utsbuf;
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char *tmp;
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char *saveptr = NULL;
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u32 version;
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uname(&utsbuf);
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if (strcmp(utsbuf.sysname, "Linux") != 0) {
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error("unsupported system: %s", utsbuf.sysname);
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exit(1);
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}
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/* 1.2.3-4-name */
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tmp = strchr(utsbuf.release, '-');
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if (tmp)
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*tmp = 0;
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tmp = strtok_r(utsbuf.release, ".", &saveptr);
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if (!string_is_numerical(tmp))
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return (u32)-1;
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version = atoi(tmp) << 16;
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tmp = strtok_r(NULL, ".", &saveptr);
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if (!string_is_numerical(tmp))
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return (u32)-1;
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version |= atoi(tmp) << 8;
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tmp = strtok_r(NULL, ".", &saveptr);
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/* Relaxed format accepts eg. 1.2.3+ */
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if (tmp && string_is_numerical(tmp))
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version |= atoi(tmp);
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return version;
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}
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/*
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* The buffer size is strlen of "4096 8192 16384 32768 65536", which is 28,
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* then round up to 32.
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*/
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#define SUPPORTED_SECTORSIZE_BUF_SIZE 32
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/*
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* Check if current kernel supports the given size
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*/
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static bool check_supported_sectorsize(u32 sectorsize)
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{
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char supported_buf[SUPPORTED_SECTORSIZE_BUF_SIZE] = { 0 };
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char sectorsize_buf[SUPPORTED_SECTORSIZE_BUF_SIZE] = { 0 };
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char *this_char;
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char *save_ptr = NULL;
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int fd;
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int ret;
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fd = sysfs_open_file("features/supported_sectorsizes");
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if (fd < 0)
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return false;
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ret = sysfs_read_file(fd, supported_buf, SUPPORTED_SECTORSIZE_BUF_SIZE);
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close(fd);
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if (ret < 0)
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return false;
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snprintf(sectorsize_buf, SUPPORTED_SECTORSIZE_BUF_SIZE, "%u", sectorsize);
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for (this_char = strtok_r(supported_buf, " ", &save_ptr);
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this_char != NULL;
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this_char = strtok_r(NULL, " ", &save_ptr)) {
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/*
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* Also check the terminal '\0' to handle cases like
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* "4096" and "40960".
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*/
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if (!strncmp(this_char, sectorsize_buf, strlen(sectorsize_buf) + 1))
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return true;
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}
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return false;
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}
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int btrfs_check_sectorsize(u32 sectorsize)
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{
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bool sectorsize_checked = false;
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u32 page_size = (u32)sysconf(_SC_PAGESIZE);
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if (!is_power_of_2(sectorsize)) {
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error("invalid sectorsize %u, must be power of 2", sectorsize);
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return -EINVAL;
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}
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if (sectorsize < SZ_4K || sectorsize > SZ_64K) {
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error("invalid sectorsize %u, expected range is [4K, 64K]",
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sectorsize);
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return -EINVAL;
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}
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if (page_size == sectorsize)
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sectorsize_checked = true;
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else
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sectorsize_checked = check_supported_sectorsize(sectorsize);
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if (!sectorsize_checked)
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warning(
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"the filesystem may not be mountable, sectorsize %u doesn't match page size %u",
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sectorsize, page_size);
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return 0;
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}
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int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
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{
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if (nodesize < sectorsize) {
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error("illegal nodesize %u (smaller than %u)",
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nodesize, sectorsize);
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return -1;
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} else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
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error("illegal nodesize %u (larger than %u)",
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nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
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return -1;
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} else if (nodesize & (sectorsize - 1)) {
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error("illegal nodesize %u (not aligned to %u)",
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nodesize, sectorsize);
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return -1;
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} else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
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nodesize != sectorsize) {
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error(
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"illegal nodesize %u (not equal to %u for mixed block group)",
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nodesize, sectorsize);
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return -1;
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}
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return 0;
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}
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/*
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* Check if the BTRFS_IOC_TREE_SEARCH_V2 ioctl is supported on a given
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* filesystem, opened at fd
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*/
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int btrfs_tree_search2_ioctl_supported(int fd)
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{
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struct btrfs_ioctl_search_args_v2 *args2;
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struct btrfs_ioctl_search_key *sk;
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int args2_size = 1024;
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char args2_buf[args2_size];
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int ret;
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args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
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sk = &(args2->key);
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/*
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* Search for the extent tree item in the root tree.
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*/
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sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
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sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
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sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
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sk->min_type = BTRFS_ROOT_ITEM_KEY;
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sk->max_type = BTRFS_ROOT_ITEM_KEY;
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sk->min_offset = 0;
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sk->max_offset = (u64)-1;
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sk->min_transid = 0;
|
|
sk->max_transid = (u64)-1;
|
|
sk->nr_items = 1;
|
|
args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
|
|
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
|
|
if (ret == -EOPNOTSUPP)
|
|
return 0;
|
|
else if (ret == 0)
|
|
return 1;
|
|
return ret;
|
|
}
|
|
|