linux/fs/btrfs/super.c
Josef Bacik 2018ef1d9a btrfs: use the original mount's mount options for the legacy reconfigure
btrfs/330, which tests our old trick to allow

mount -o ro,subvol=/x /dev/sda1 /foo
mount -o rw,subvol=/y /dev/sda1 /bar

fails on the block group tree.  This is because we aren't preserving the
mount options for what is essentially a remount, and thus we're ending
up without the FREE_SPACE_TREE mount option, which triggers our free
space tree delete codepath.  This isn't possible with the block group
tree and thus it falls over.

Fix this by making sure we copy the existing mount options for the
existing fs mount over in this case.

Fixes: f044b31867 ("btrfs: handle the ro->rw transition for mounting different subvolumes")
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2024-01-18 23:38:54 +01:00

2566 lines
73 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*/
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
#include <linux/parser.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/miscdevice.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/crc32c.h>
#include <linux/btrfs.h>
#include <linux/security.h>
#include <linux/fs_parser.h>
#include "messages.h"
#include "delayed-inode.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "print-tree.h"
#include "props.h"
#include "xattr.h"
#include "bio.h"
#include "export.h"
#include "compression.h"
#include "rcu-string.h"
#include "dev-replace.h"
#include "free-space-cache.h"
#include "backref.h"
#include "space-info.h"
#include "sysfs.h"
#include "zoned.h"
#include "tests/btrfs-tests.h"
#include "block-group.h"
#include "discard.h"
#include "qgroup.h"
#include "raid56.h"
#include "fs.h"
#include "accessors.h"
#include "defrag.h"
#include "dir-item.h"
#include "ioctl.h"
#include "scrub.h"
#include "verity.h"
#include "super.h"
#include "extent-tree.h"
#define CREATE_TRACE_POINTS
#include <trace/events/btrfs.h>
static const struct super_operations btrfs_super_ops;
static struct file_system_type btrfs_fs_type;
static void btrfs_put_super(struct super_block *sb)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
btrfs_info(fs_info, "last unmount of filesystem %pU", fs_info->fs_devices->fsid);
close_ctree(fs_info);
}
/* Store the mount options related information. */
struct btrfs_fs_context {
char *subvol_name;
u64 subvol_objectid;
u64 max_inline;
u32 commit_interval;
u32 metadata_ratio;
u32 thread_pool_size;
unsigned long mount_opt;
unsigned long compress_type:4;
unsigned int compress_level;
refcount_t refs;
};
enum {
Opt_acl,
Opt_clear_cache,
Opt_commit_interval,
Opt_compress,
Opt_compress_force,
Opt_compress_force_type,
Opt_compress_type,
Opt_degraded,
Opt_device,
Opt_fatal_errors,
Opt_flushoncommit,
Opt_max_inline,
Opt_barrier,
Opt_datacow,
Opt_datasum,
Opt_defrag,
Opt_discard,
Opt_discard_mode,
Opt_ratio,
Opt_rescan_uuid_tree,
Opt_skip_balance,
Opt_space_cache,
Opt_space_cache_version,
Opt_ssd,
Opt_ssd_spread,
Opt_subvol,
Opt_subvol_empty,
Opt_subvolid,
Opt_thread_pool,
Opt_treelog,
Opt_user_subvol_rm_allowed,
/* Rescue options */
Opt_rescue,
Opt_usebackuproot,
Opt_nologreplay,
Opt_ignorebadroots,
Opt_ignoredatacsums,
Opt_rescue_all,
/* Debugging options */
Opt_enospc_debug,
#ifdef CONFIG_BTRFS_DEBUG
Opt_fragment, Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
#endif
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
Opt_ref_verify,
#endif
Opt_err,
};
enum {
Opt_fatal_errors_panic,
Opt_fatal_errors_bug,
};
static const struct constant_table btrfs_parameter_fatal_errors[] = {
{ "panic", Opt_fatal_errors_panic },
{ "bug", Opt_fatal_errors_bug },
{}
};
enum {
Opt_discard_sync,
Opt_discard_async,
};
static const struct constant_table btrfs_parameter_discard[] = {
{ "sync", Opt_discard_sync },
{ "async", Opt_discard_async },
{}
};
enum {
Opt_space_cache_v1,
Opt_space_cache_v2,
};
static const struct constant_table btrfs_parameter_space_cache[] = {
{ "v1", Opt_space_cache_v1 },
{ "v2", Opt_space_cache_v2 },
{}
};
enum {
Opt_rescue_usebackuproot,
Opt_rescue_nologreplay,
Opt_rescue_ignorebadroots,
Opt_rescue_ignoredatacsums,
Opt_rescue_parameter_all,
};
static const struct constant_table btrfs_parameter_rescue[] = {
{ "usebackuproot", Opt_rescue_usebackuproot },
{ "nologreplay", Opt_rescue_nologreplay },
{ "ignorebadroots", Opt_rescue_ignorebadroots },
{ "ibadroots", Opt_rescue_ignorebadroots },
{ "ignoredatacsums", Opt_rescue_ignoredatacsums },
{ "idatacsums", Opt_rescue_ignoredatacsums },
{ "all", Opt_rescue_parameter_all },
{}
};
#ifdef CONFIG_BTRFS_DEBUG
enum {
Opt_fragment_parameter_data,
Opt_fragment_parameter_metadata,
Opt_fragment_parameter_all,
};
static const struct constant_table btrfs_parameter_fragment[] = {
{ "data", Opt_fragment_parameter_data },
{ "metadata", Opt_fragment_parameter_metadata },
{ "all", Opt_fragment_parameter_all },
{}
};
#endif
static const struct fs_parameter_spec btrfs_fs_parameters[] = {
fsparam_flag_no("acl", Opt_acl),
fsparam_flag_no("autodefrag", Opt_defrag),
fsparam_flag_no("barrier", Opt_barrier),
fsparam_flag("clear_cache", Opt_clear_cache),
fsparam_u32("commit", Opt_commit_interval),
fsparam_flag("compress", Opt_compress),
fsparam_string("compress", Opt_compress_type),
fsparam_flag("compress-force", Opt_compress_force),
fsparam_string("compress-force", Opt_compress_force_type),
fsparam_flag_no("datacow", Opt_datacow),
fsparam_flag_no("datasum", Opt_datasum),
fsparam_flag("degraded", Opt_degraded),
fsparam_string("device", Opt_device),
fsparam_flag_no("discard", Opt_discard),
fsparam_enum("discard", Opt_discard_mode, btrfs_parameter_discard),
fsparam_enum("fatal_errors", Opt_fatal_errors, btrfs_parameter_fatal_errors),
fsparam_flag_no("flushoncommit", Opt_flushoncommit),
fsparam_string("max_inline", Opt_max_inline),
fsparam_u32("metadata_ratio", Opt_ratio),
fsparam_flag("rescan_uuid_tree", Opt_rescan_uuid_tree),
fsparam_flag("skip_balance", Opt_skip_balance),
fsparam_flag_no("space_cache", Opt_space_cache),
fsparam_enum("space_cache", Opt_space_cache_version, btrfs_parameter_space_cache),
fsparam_flag_no("ssd", Opt_ssd),
fsparam_flag_no("ssd_spread", Opt_ssd_spread),
fsparam_string("subvol", Opt_subvol),
fsparam_flag("subvol=", Opt_subvol_empty),
fsparam_u64("subvolid", Opt_subvolid),
fsparam_u32("thread_pool", Opt_thread_pool),
fsparam_flag_no("treelog", Opt_treelog),
fsparam_flag("user_subvol_rm_allowed", Opt_user_subvol_rm_allowed),
/* Rescue options. */
fsparam_enum("rescue", Opt_rescue, btrfs_parameter_rescue),
/* Deprecated, with alias rescue=nologreplay */
__fsparam(NULL, "nologreplay", Opt_nologreplay, fs_param_deprecated, NULL),
/* Deprecated, with alias rescue=usebackuproot */
__fsparam(NULL, "usebackuproot", Opt_usebackuproot, fs_param_deprecated, NULL),
/* Debugging options. */
fsparam_flag_no("enospc_debug", Opt_enospc_debug),
#ifdef CONFIG_BTRFS_DEBUG
fsparam_enum("fragment", Opt_fragment, btrfs_parameter_fragment),
#endif
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
fsparam_flag("ref_verify", Opt_ref_verify),
#endif
{}
};
static int btrfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct btrfs_fs_context *ctx = fc->fs_private;
struct fs_parse_result result;
int opt;
opt = fs_parse(fc, btrfs_fs_parameters, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_degraded:
btrfs_set_opt(ctx->mount_opt, DEGRADED);
break;
case Opt_subvol_empty:
/*
* This exists because we used to allow it on accident, so we're
* keeping it to maintain ABI. See 37becec95ac3 ("Btrfs: allow
* empty subvol= again").
*/
break;
case Opt_subvol:
kfree(ctx->subvol_name);
ctx->subvol_name = kstrdup(param->string, GFP_KERNEL);
if (!ctx->subvol_name)
return -ENOMEM;
break;
case Opt_subvolid:
ctx->subvol_objectid = result.uint_64;
/* subvolid=0 means give me the original fs_tree. */
if (!ctx->subvol_objectid)
ctx->subvol_objectid = BTRFS_FS_TREE_OBJECTID;
break;
case Opt_device: {
struct btrfs_device *device;
blk_mode_t mode = sb_open_mode(fc->sb_flags);
mutex_lock(&uuid_mutex);
device = btrfs_scan_one_device(param->string, mode, false);
mutex_unlock(&uuid_mutex);
if (IS_ERR(device))
return PTR_ERR(device);
break;
}
case Opt_datasum:
if (result.negated) {
btrfs_set_opt(ctx->mount_opt, NODATASUM);
} else {
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
btrfs_clear_opt(ctx->mount_opt, NODATASUM);
}
break;
case Opt_datacow:
if (result.negated) {
btrfs_clear_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, FORCE_COMPRESS);
btrfs_set_opt(ctx->mount_opt, NODATACOW);
btrfs_set_opt(ctx->mount_opt, NODATASUM);
} else {
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
}
break;
case Opt_compress_force:
case Opt_compress_force_type:
btrfs_set_opt(ctx->mount_opt, FORCE_COMPRESS);
fallthrough;
case Opt_compress:
case Opt_compress_type:
if (opt == Opt_compress || opt == Opt_compress_force) {
ctx->compress_type = BTRFS_COMPRESS_ZLIB;
ctx->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
btrfs_set_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
btrfs_clear_opt(ctx->mount_opt, NODATASUM);
} else if (strncmp(param->string, "zlib", 4) == 0) {
ctx->compress_type = BTRFS_COMPRESS_ZLIB;
ctx->compress_level =
btrfs_compress_str2level(BTRFS_COMPRESS_ZLIB,
param->string + 4);
btrfs_set_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
btrfs_clear_opt(ctx->mount_opt, NODATASUM);
} else if (strncmp(param->string, "lzo", 3) == 0) {
ctx->compress_type = BTRFS_COMPRESS_LZO;
ctx->compress_level = 0;
btrfs_set_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
btrfs_clear_opt(ctx->mount_opt, NODATASUM);
} else if (strncmp(param->string, "zstd", 4) == 0) {
ctx->compress_type = BTRFS_COMPRESS_ZSTD;
ctx->compress_level =
btrfs_compress_str2level(BTRFS_COMPRESS_ZSTD,
param->string + 4);
btrfs_set_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, NODATACOW);
btrfs_clear_opt(ctx->mount_opt, NODATASUM);
} else if (strncmp(param->string, "no", 2) == 0) {
ctx->compress_level = 0;
ctx->compress_type = 0;
btrfs_clear_opt(ctx->mount_opt, COMPRESS);
btrfs_clear_opt(ctx->mount_opt, FORCE_COMPRESS);
} else {
btrfs_err(NULL, "unrecognized compression value %s",
param->string);
return -EINVAL;
}
break;
case Opt_ssd:
if (result.negated) {
btrfs_set_opt(ctx->mount_opt, NOSSD);
btrfs_clear_opt(ctx->mount_opt, SSD);
btrfs_clear_opt(ctx->mount_opt, SSD_SPREAD);
} else {
btrfs_set_opt(ctx->mount_opt, SSD);
btrfs_clear_opt(ctx->mount_opt, NOSSD);
}
break;
case Opt_ssd_spread:
if (result.negated) {
btrfs_clear_opt(ctx->mount_opt, SSD_SPREAD);
} else {
btrfs_set_opt(ctx->mount_opt, SSD);
btrfs_set_opt(ctx->mount_opt, SSD_SPREAD);
btrfs_clear_opt(ctx->mount_opt, NOSSD);
}
break;
case Opt_barrier:
if (result.negated)
btrfs_set_opt(ctx->mount_opt, NOBARRIER);
else
btrfs_clear_opt(ctx->mount_opt, NOBARRIER);
break;
case Opt_thread_pool:
if (result.uint_32 == 0) {
btrfs_err(NULL, "invalid value 0 for thread_pool");
return -EINVAL;
}
ctx->thread_pool_size = result.uint_32;
break;
case Opt_max_inline:
ctx->max_inline = memparse(param->string, NULL);
break;
case Opt_acl:
if (result.negated) {
fc->sb_flags &= ~SB_POSIXACL;
} else {
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#else
btrfs_err(NULL, "support for ACL not compiled in");
return -EINVAL;
#endif
}
/*
* VFS limits the ability to toggle ACL on and off via remount,
* despite every file system allowing this. This seems to be
* an oversight since we all do, but it'll fail if we're
* remounting. So don't set the mask here, we'll check it in
* btrfs_reconfigure and do the toggling ourselves.
*/
if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE)
fc->sb_flags_mask |= SB_POSIXACL;
break;
case Opt_treelog:
if (result.negated)
btrfs_set_opt(ctx->mount_opt, NOTREELOG);
else
btrfs_clear_opt(ctx->mount_opt, NOTREELOG);
break;
case Opt_nologreplay:
btrfs_warn(NULL,
"'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
break;
case Opt_flushoncommit:
if (result.negated)
btrfs_clear_opt(ctx->mount_opt, FLUSHONCOMMIT);
else
btrfs_set_opt(ctx->mount_opt, FLUSHONCOMMIT);
break;
case Opt_ratio:
ctx->metadata_ratio = result.uint_32;
break;
case Opt_discard:
if (result.negated) {
btrfs_clear_opt(ctx->mount_opt, DISCARD_SYNC);
btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC);
btrfs_set_opt(ctx->mount_opt, NODISCARD);
} else {
btrfs_set_opt(ctx->mount_opt, DISCARD_SYNC);
btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC);
}
break;
case Opt_discard_mode:
switch (result.uint_32) {
case Opt_discard_sync:
btrfs_clear_opt(ctx->mount_opt, DISCARD_ASYNC);
btrfs_set_opt(ctx->mount_opt, DISCARD_SYNC);
break;
case Opt_discard_async:
btrfs_clear_opt(ctx->mount_opt, DISCARD_SYNC);
btrfs_set_opt(ctx->mount_opt, DISCARD_ASYNC);
break;
default:
btrfs_err(NULL, "unrecognized discard mode value %s",
param->key);
return -EINVAL;
}
btrfs_clear_opt(ctx->mount_opt, NODISCARD);
break;
case Opt_space_cache:
if (result.negated) {
btrfs_set_opt(ctx->mount_opt, NOSPACECACHE);
btrfs_clear_opt(ctx->mount_opt, SPACE_CACHE);
btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE);
} else {
btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE);
btrfs_set_opt(ctx->mount_opt, SPACE_CACHE);
}
break;
case Opt_space_cache_version:
switch (result.uint_32) {
case Opt_space_cache_v1:
btrfs_set_opt(ctx->mount_opt, SPACE_CACHE);
btrfs_clear_opt(ctx->mount_opt, FREE_SPACE_TREE);
break;
case Opt_space_cache_v2:
btrfs_clear_opt(ctx->mount_opt, SPACE_CACHE);
btrfs_set_opt(ctx->mount_opt, FREE_SPACE_TREE);
break;
default:
btrfs_err(NULL, "unrecognized space_cache value %s",
param->key);
return -EINVAL;
}
break;
case Opt_rescan_uuid_tree:
btrfs_set_opt(ctx->mount_opt, RESCAN_UUID_TREE);
break;
case Opt_clear_cache:
btrfs_set_opt(ctx->mount_opt, CLEAR_CACHE);
break;
case Opt_user_subvol_rm_allowed:
btrfs_set_opt(ctx->mount_opt, USER_SUBVOL_RM_ALLOWED);
break;
case Opt_enospc_debug:
if (result.negated)
btrfs_clear_opt(ctx->mount_opt, ENOSPC_DEBUG);
else
btrfs_set_opt(ctx->mount_opt, ENOSPC_DEBUG);
break;
case Opt_defrag:
if (result.negated)
btrfs_clear_opt(ctx->mount_opt, AUTO_DEFRAG);
else
btrfs_set_opt(ctx->mount_opt, AUTO_DEFRAG);
break;
case Opt_usebackuproot:
btrfs_warn(NULL,
"'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead");
btrfs_set_opt(ctx->mount_opt, USEBACKUPROOT);
/* If we're loading the backup roots we can't trust the space cache. */
btrfs_set_opt(ctx->mount_opt, CLEAR_CACHE);
break;
case Opt_skip_balance:
btrfs_set_opt(ctx->mount_opt, SKIP_BALANCE);
break;
case Opt_fatal_errors:
switch (result.uint_32) {
case Opt_fatal_errors_panic:
btrfs_set_opt(ctx->mount_opt, PANIC_ON_FATAL_ERROR);
break;
case Opt_fatal_errors_bug:
btrfs_clear_opt(ctx->mount_opt, PANIC_ON_FATAL_ERROR);
break;
default:
btrfs_err(NULL, "unrecognized fatal_errors value %s",
param->key);
return -EINVAL;
}
break;
case Opt_commit_interval:
ctx->commit_interval = result.uint_32;
if (ctx->commit_interval == 0)
ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
break;
case Opt_rescue:
switch (result.uint_32) {
case Opt_rescue_usebackuproot:
btrfs_set_opt(ctx->mount_opt, USEBACKUPROOT);
break;
case Opt_rescue_nologreplay:
btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
break;
case Opt_rescue_ignorebadroots:
btrfs_set_opt(ctx->mount_opt, IGNOREBADROOTS);
break;
case Opt_rescue_ignoredatacsums:
btrfs_set_opt(ctx->mount_opt, IGNOREDATACSUMS);
break;
case Opt_rescue_parameter_all:
btrfs_set_opt(ctx->mount_opt, IGNOREDATACSUMS);
btrfs_set_opt(ctx->mount_opt, IGNOREBADROOTS);
btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
break;
default:
btrfs_info(NULL, "unrecognized rescue option '%s'",
param->key);
return -EINVAL;
}
break;
#ifdef CONFIG_BTRFS_DEBUG
case Opt_fragment:
switch (result.uint_32) {
case Opt_fragment_parameter_all:
btrfs_set_opt(ctx->mount_opt, FRAGMENT_DATA);
btrfs_set_opt(ctx->mount_opt, FRAGMENT_METADATA);
break;
case Opt_fragment_parameter_metadata:
btrfs_set_opt(ctx->mount_opt, FRAGMENT_METADATA);
break;
case Opt_fragment_parameter_data:
btrfs_set_opt(ctx->mount_opt, FRAGMENT_DATA);
break;
default:
btrfs_info(NULL, "unrecognized fragment option '%s'",
param->key);
return -EINVAL;
}
break;
#endif
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
case Opt_ref_verify:
btrfs_set_opt(ctx->mount_opt, REF_VERIFY);
break;
#endif
default:
btrfs_err(NULL, "unrecognized mount option '%s'", param->key);
return -EINVAL;
}
return 0;
}
/*
* Some options only have meaning at mount time and shouldn't persist across
* remounts, or be displayed. Clear these at the end of mount and remount code
* paths.
*/
static void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
{
btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
btrfs_clear_opt(fs_info->mount_opt, NOSPACECACHE);
}
static bool check_ro_option(struct btrfs_fs_info *fs_info,
unsigned long mount_opt, unsigned long opt,
const char *opt_name)
{
if (mount_opt & opt) {
btrfs_err(fs_info, "%s must be used with ro mount option",
opt_name);
return true;
}
return false;
}
bool btrfs_check_options(struct btrfs_fs_info *info, unsigned long *mount_opt,
unsigned long flags)
{
bool ret = true;
if (!(flags & SB_RDONLY) &&
(check_ro_option(info, *mount_opt, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") ||
check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") ||
check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")))
ret = false;
if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) &&
!btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE) &&
!btrfs_raw_test_opt(*mount_opt, CLEAR_CACHE)) {
btrfs_err(info, "cannot disable free-space-tree");
ret = false;
}
if (btrfs_fs_compat_ro(info, BLOCK_GROUP_TREE) &&
!btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE)) {
btrfs_err(info, "cannot disable free-space-tree with block-group-tree feature");
ret = false;
}
if (btrfs_check_mountopts_zoned(info, mount_opt))
ret = false;
if (!test_bit(BTRFS_FS_STATE_REMOUNTING, &info->fs_state)) {
if (btrfs_raw_test_opt(*mount_opt, SPACE_CACHE))
btrfs_info(info, "disk space caching is enabled");
if (btrfs_raw_test_opt(*mount_opt, FREE_SPACE_TREE))
btrfs_info(info, "using free-space-tree");
}
return ret;
}
/*
* This is subtle, we only call this during open_ctree(). We need to pre-load
* the mount options with the on-disk settings. Before the new mount API took
* effect we would do this on mount and remount. With the new mount API we'll
* only do this on the initial mount.
*
* This isn't a change in behavior, because we're using the current state of the
* file system to set the current mount options. If you mounted with special
* options to disable these features and then remounted we wouldn't revert the
* settings, because mounting without these features cleared the on-disk
* settings, so this being called on re-mount is not needed.
*/
void btrfs_set_free_space_cache_settings(struct btrfs_fs_info *fs_info)
{
if (fs_info->sectorsize < PAGE_SIZE) {
btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
if (!btrfs_test_opt(fs_info, FREE_SPACE_TREE)) {
btrfs_info(fs_info,
"forcing free space tree for sector size %u with page size %lu",
fs_info->sectorsize, PAGE_SIZE);
btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE);
}
}
/*
* At this point our mount options are populated, so we only mess with
* these settings if we don't have any settings already.
*/
if (btrfs_test_opt(fs_info, FREE_SPACE_TREE))
return;
if (btrfs_is_zoned(fs_info) &&
btrfs_free_space_cache_v1_active(fs_info)) {
btrfs_info(fs_info, "zoned: clearing existing space cache");
btrfs_set_super_cache_generation(fs_info->super_copy, 0);
return;
}
if (btrfs_test_opt(fs_info, SPACE_CACHE))
return;
if (btrfs_test_opt(fs_info, NOSPACECACHE))
return;
/*
* At this point we don't have explicit options set by the user, set
* them ourselves based on the state of the file system.
*/
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE);
else if (btrfs_free_space_cache_v1_active(fs_info))
btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE);
}
static void set_device_specific_options(struct btrfs_fs_info *fs_info)
{
if (!btrfs_test_opt(fs_info, NOSSD) &&
!fs_info->fs_devices->rotating)
btrfs_set_opt(fs_info->mount_opt, SSD);
/*
* For devices supporting discard turn on discard=async automatically,
* unless it's already set or disabled. This could be turned off by
* nodiscard for the same mount.
*
* The zoned mode piggy backs on the discard functionality for
* resetting a zone. There is no reason to delay the zone reset as it is
* fast enough. So, do not enable async discard for zoned mode.
*/
if (!(btrfs_test_opt(fs_info, DISCARD_SYNC) ||
btrfs_test_opt(fs_info, DISCARD_ASYNC) ||
btrfs_test_opt(fs_info, NODISCARD)) &&
fs_info->fs_devices->discardable &&
!btrfs_is_zoned(fs_info))
btrfs_set_opt(fs_info->mount_opt, DISCARD_ASYNC);
}
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
u64 subvol_objectid)
{
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_root *fs_root = NULL;
struct btrfs_root_ref *root_ref;
struct btrfs_inode_ref *inode_ref;
struct btrfs_key key;
struct btrfs_path *path = NULL;
char *name = NULL, *ptr;
u64 dirid;
int len;
int ret;
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto err;
}
name = kmalloc(PATH_MAX, GFP_KERNEL);
if (!name) {
ret = -ENOMEM;
goto err;
}
ptr = name + PATH_MAX - 1;
ptr[0] = '\0';
/*
* Walk up the subvolume trees in the tree of tree roots by root
* backrefs until we hit the top-level subvolume.
*/
while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
key.objectid = subvol_objectid;
key.type = BTRFS_ROOT_BACKREF_KEY;
key.offset = (u64)-1;
ret = btrfs_search_backwards(root, &key, path);
if (ret < 0) {
goto err;
} else if (ret > 0) {
ret = -ENOENT;
goto err;
}
subvol_objectid = key.offset;
root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_root_ref);
len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
ptr -= len + 1;
if (ptr < name) {
ret = -ENAMETOOLONG;
goto err;
}
read_extent_buffer(path->nodes[0], ptr + 1,
(unsigned long)(root_ref + 1), len);
ptr[0] = '/';
dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
btrfs_release_path(path);
fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true);
if (IS_ERR(fs_root)) {
ret = PTR_ERR(fs_root);
fs_root = NULL;
goto err;
}
/*
* Walk up the filesystem tree by inode refs until we hit the
* root directory.
*/
while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
key.objectid = dirid;
key.type = BTRFS_INODE_REF_KEY;
key.offset = (u64)-1;
ret = btrfs_search_backwards(fs_root, &key, path);
if (ret < 0) {
goto err;
} else if (ret > 0) {
ret = -ENOENT;
goto err;
}
dirid = key.offset;
inode_ref = btrfs_item_ptr(path->nodes[0],
path->slots[0],
struct btrfs_inode_ref);
len = btrfs_inode_ref_name_len(path->nodes[0],
inode_ref);
ptr -= len + 1;
if (ptr < name) {
ret = -ENAMETOOLONG;
goto err;
}
read_extent_buffer(path->nodes[0], ptr + 1,
(unsigned long)(inode_ref + 1), len);
ptr[0] = '/';
btrfs_release_path(path);
}
btrfs_put_root(fs_root);
fs_root = NULL;
}
btrfs_free_path(path);
if (ptr == name + PATH_MAX - 1) {
name[0] = '/';
name[1] = '\0';
} else {
memmove(name, ptr, name + PATH_MAX - ptr);
}
return name;
err:
btrfs_put_root(fs_root);
btrfs_free_path(path);
kfree(name);
return ERR_PTR(ret);
}
static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
{
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_dir_item *di;
struct btrfs_path *path;
struct btrfs_key location;
struct fscrypt_str name = FSTR_INIT("default", 7);
u64 dir_id;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/*
* Find the "default" dir item which points to the root item that we
* will mount by default if we haven't been given a specific subvolume
* to mount.
*/
dir_id = btrfs_super_root_dir(fs_info->super_copy);
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, &name, 0);
if (IS_ERR(di)) {
btrfs_free_path(path);
return PTR_ERR(di);
}
if (!di) {
/*
* Ok the default dir item isn't there. This is weird since
* it's always been there, but don't freak out, just try and
* mount the top-level subvolume.
*/
btrfs_free_path(path);
*objectid = BTRFS_FS_TREE_OBJECTID;
return 0;
}
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
btrfs_free_path(path);
*objectid = location.objectid;
return 0;
}
static int btrfs_fill_super(struct super_block *sb,
struct btrfs_fs_devices *fs_devices,
void *data)
{
struct inode *inode;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
int err;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
sb->s_d_op = &btrfs_dentry_operations;
sb->s_export_op = &btrfs_export_ops;
#ifdef CONFIG_FS_VERITY
sb->s_vop = &btrfs_verityops;
#endif
sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
sb->s_iflags |= SB_I_CGROUPWB;
err = super_setup_bdi(sb);
if (err) {
btrfs_err(fs_info, "super_setup_bdi failed");
return err;
}
err = open_ctree(sb, fs_devices, (char *)data);
if (err) {
btrfs_err(fs_info, "open_ctree failed");
return err;
}
inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
btrfs_handle_fs_error(fs_info, err, NULL);
goto fail_close;
}
sb->s_root = d_make_root(inode);
if (!sb->s_root) {
err = -ENOMEM;
goto fail_close;
}
sb->s_flags |= SB_ACTIVE;
return 0;
fail_close:
close_ctree(fs_info);
return err;
}
int btrfs_sync_fs(struct super_block *sb, int wait)
{
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
trace_btrfs_sync_fs(fs_info, wait);
if (!wait) {
filemap_flush(fs_info->btree_inode->i_mapping);
return 0;
}
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {
/* no transaction, don't bother */
if (PTR_ERR(trans) == -ENOENT) {
/*
* Exit unless we have some pending changes
* that need to go through commit
*/
if (!test_bit(BTRFS_FS_NEED_TRANS_COMMIT,
&fs_info->flags))
return 0;
/*
* A non-blocking test if the fs is frozen. We must not
* start a new transaction here otherwise a deadlock
* happens. The pending operations are delayed to the
* next commit after thawing.
*/
if (sb_start_write_trylock(sb))
sb_end_write(sb);
else
return 0;
trans = btrfs_start_transaction(root, 0);
}
if (IS_ERR(trans))
return PTR_ERR(trans);
}
return btrfs_commit_transaction(trans);
}
static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed)
{
seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s);
*printed = true;
}
static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
{
struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
const char *compress_type;
const char *subvol_name;
bool printed = false;
if (btrfs_test_opt(info, DEGRADED))
seq_puts(seq, ",degraded");
if (btrfs_test_opt(info, NODATASUM))
seq_puts(seq, ",nodatasum");
if (btrfs_test_opt(info, NODATACOW))
seq_puts(seq, ",nodatacow");
if (btrfs_test_opt(info, NOBARRIER))
seq_puts(seq, ",nobarrier");
if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
seq_printf(seq, ",max_inline=%llu", info->max_inline);
if (info->thread_pool_size != min_t(unsigned long,
num_online_cpus() + 2, 8))
seq_printf(seq, ",thread_pool=%u", info->thread_pool_size);
if (btrfs_test_opt(info, COMPRESS)) {
compress_type = btrfs_compress_type2str(info->compress_type);
if (btrfs_test_opt(info, FORCE_COMPRESS))
seq_printf(seq, ",compress-force=%s", compress_type);
else
seq_printf(seq, ",compress=%s", compress_type);
if (info->compress_level)
seq_printf(seq, ":%d", info->compress_level);
}
if (btrfs_test_opt(info, NOSSD))
seq_puts(seq, ",nossd");
if (btrfs_test_opt(info, SSD_SPREAD))
seq_puts(seq, ",ssd_spread");
else if (btrfs_test_opt(info, SSD))
seq_puts(seq, ",ssd");
if (btrfs_test_opt(info, NOTREELOG))
seq_puts(seq, ",notreelog");
if (btrfs_test_opt(info, NOLOGREPLAY))
print_rescue_option(seq, "nologreplay", &printed);
if (btrfs_test_opt(info, USEBACKUPROOT))
print_rescue_option(seq, "usebackuproot", &printed);
if (btrfs_test_opt(info, IGNOREBADROOTS))
print_rescue_option(seq, "ignorebadroots", &printed);
if (btrfs_test_opt(info, IGNOREDATACSUMS))
print_rescue_option(seq, "ignoredatacsums", &printed);
if (btrfs_test_opt(info, FLUSHONCOMMIT))
seq_puts(seq, ",flushoncommit");
if (btrfs_test_opt(info, DISCARD_SYNC))
seq_puts(seq, ",discard");
if (btrfs_test_opt(info, DISCARD_ASYNC))
seq_puts(seq, ",discard=async");
if (!(info->sb->s_flags & SB_POSIXACL))
seq_puts(seq, ",noacl");
if (btrfs_free_space_cache_v1_active(info))
seq_puts(seq, ",space_cache");
else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
seq_puts(seq, ",space_cache=v2");
else
seq_puts(seq, ",nospace_cache");
if (btrfs_test_opt(info, RESCAN_UUID_TREE))
seq_puts(seq, ",rescan_uuid_tree");
if (btrfs_test_opt(info, CLEAR_CACHE))
seq_puts(seq, ",clear_cache");
if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED))
seq_puts(seq, ",user_subvol_rm_allowed");
if (btrfs_test_opt(info, ENOSPC_DEBUG))
seq_puts(seq, ",enospc_debug");
if (btrfs_test_opt(info, AUTO_DEFRAG))
seq_puts(seq, ",autodefrag");
if (btrfs_test_opt(info, SKIP_BALANCE))
seq_puts(seq, ",skip_balance");
if (info->metadata_ratio)
seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio);
if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR))
seq_puts(seq, ",fatal_errors=panic");
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
seq_printf(seq, ",commit=%u", info->commit_interval);
#ifdef CONFIG_BTRFS_DEBUG
if (btrfs_test_opt(info, FRAGMENT_DATA))
seq_puts(seq, ",fragment=data");
if (btrfs_test_opt(info, FRAGMENT_METADATA))
seq_puts(seq, ",fragment=metadata");
#endif
if (btrfs_test_opt(info, REF_VERIFY))
seq_puts(seq, ",ref_verify");
seq_printf(seq, ",subvolid=%llu",
BTRFS_I(d_inode(dentry))->root->root_key.objectid);
subvol_name = btrfs_get_subvol_name_from_objectid(info,
BTRFS_I(d_inode(dentry))->root->root_key.objectid);
if (!IS_ERR(subvol_name)) {
seq_puts(seq, ",subvol=");
seq_escape(seq, subvol_name, " \t\n\\");
kfree(subvol_name);
}
return 0;
}
/*
* subvolumes are identified by ino 256
*/
static inline int is_subvolume_inode(struct inode *inode)
{
if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
return 1;
return 0;
}
static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
struct vfsmount *mnt)
{
struct dentry *root;
int ret;
if (!subvol_name) {
if (!subvol_objectid) {
ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
&subvol_objectid);
if (ret) {
root = ERR_PTR(ret);
goto out;
}
}
subvol_name = btrfs_get_subvol_name_from_objectid(
btrfs_sb(mnt->mnt_sb), subvol_objectid);
if (IS_ERR(subvol_name)) {
root = ERR_CAST(subvol_name);
subvol_name = NULL;
goto out;
}
}
root = mount_subtree(mnt, subvol_name);
/* mount_subtree() drops our reference on the vfsmount. */
mnt = NULL;
if (!IS_ERR(root)) {
struct super_block *s = root->d_sb;
struct btrfs_fs_info *fs_info = btrfs_sb(s);
struct inode *root_inode = d_inode(root);
u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
ret = 0;
if (!is_subvolume_inode(root_inode)) {
btrfs_err(fs_info, "'%s' is not a valid subvolume",
subvol_name);
ret = -EINVAL;
}
if (subvol_objectid && root_objectid != subvol_objectid) {
/*
* This will also catch a race condition where a
* subvolume which was passed by ID is renamed and
* another subvolume is renamed over the old location.
*/
btrfs_err(fs_info,
"subvol '%s' does not match subvolid %llu",
subvol_name, subvol_objectid);
ret = -EINVAL;
}
if (ret) {
dput(root);
root = ERR_PTR(ret);
deactivate_locked_super(s);
}
}
out:
mntput(mnt);
kfree(subvol_name);
return root;
}
static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
u32 new_pool_size, u32 old_pool_size)
{
if (new_pool_size == old_pool_size)
return;
fs_info->thread_pool_size = new_pool_size;
btrfs_info(fs_info, "resize thread pool %d -> %d",
old_pool_size, new_pool_size);
btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
workqueue_set_max_active(fs_info->endio_workers, new_pool_size);
workqueue_set_max_active(fs_info->endio_meta_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
}
static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
unsigned long old_opts, int flags)
{
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
(flags & SB_RDONLY))) {
/* wait for any defraggers to finish */
wait_event(fs_info->transaction_wait,
(atomic_read(&fs_info->defrag_running) == 0));
if (flags & SB_RDONLY)
sync_filesystem(fs_info->sb);
}
}
static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
unsigned long old_opts)
{
const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
/*
* We need to cleanup all defragable inodes if the autodefragment is
* close or the filesystem is read only.
*/
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) {
btrfs_cleanup_defrag_inodes(fs_info);
}
/* If we toggled discard async */
if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
btrfs_test_opt(fs_info, DISCARD_ASYNC))
btrfs_discard_resume(fs_info);
else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
!btrfs_test_opt(fs_info, DISCARD_ASYNC))
btrfs_discard_cleanup(fs_info);
/* If we toggled space cache */
if (cache_opt != btrfs_free_space_cache_v1_active(fs_info))
btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
}
static int btrfs_remount_rw(struct btrfs_fs_info *fs_info)
{
int ret;
if (BTRFS_FS_ERROR(fs_info)) {
btrfs_err(fs_info,
"remounting read-write after error is not allowed");
return -EINVAL;
}
if (fs_info->fs_devices->rw_devices == 0)
return -EACCES;
if (!btrfs_check_rw_degradable(fs_info, NULL)) {
btrfs_warn(fs_info,
"too many missing devices, writable remount is not allowed");
return -EACCES;
}
if (btrfs_super_log_root(fs_info->super_copy) != 0) {
btrfs_warn(fs_info,
"mount required to replay tree-log, cannot remount read-write");
return -EINVAL;
}
/*
* NOTE: when remounting with a change that does writes, don't put it
* anywhere above this point, as we are not sure to be safe to write
* until we pass the above checks.
*/
ret = btrfs_start_pre_rw_mount(fs_info);
if (ret)
return ret;
btrfs_clear_sb_rdonly(fs_info->sb);
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
/*
* If we've gone from readonly -> read-write, we need to get our
* sync/async discard lists in the right state.
*/
btrfs_discard_resume(fs_info);
return 0;
}
static int btrfs_remount_ro(struct btrfs_fs_info *fs_info)
{
/*
* This also happens on 'umount -rf' or on shutdown, when the
* filesystem is busy.
*/
cancel_work_sync(&fs_info->async_reclaim_work);
cancel_work_sync(&fs_info->async_data_reclaim_work);
btrfs_discard_cleanup(fs_info);
/* Wait for the uuid_scan task to finish */
down(&fs_info->uuid_tree_rescan_sem);
/* Avoid complains from lockdep et al. */
up(&fs_info->uuid_tree_rescan_sem);
btrfs_set_sb_rdonly(fs_info->sb);
/*
* Setting SB_RDONLY will put the cleaner thread to sleep at the next
* loop if it's already active. If it's already asleep, we'll leave
* unused block groups on disk until we're mounted read-write again
* unless we clean them up here.
*/
btrfs_delete_unused_bgs(fs_info);
/*
* The cleaner task could be already running before we set the flag
* BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock). We must make
* sure that after we finish the remount, i.e. after we call
* btrfs_commit_super(), the cleaner can no longer start a transaction
* - either because it was dropping a dead root, running delayed iputs
* or deleting an unused block group (the cleaner picked a block
* group from the list of unused block groups before we were able to
* in the previous call to btrfs_delete_unused_bgs()).
*/
wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING, TASK_UNINTERRUPTIBLE);
/*
* We've set the superblock to RO mode, so we might have made the
* cleaner task sleep without running all pending delayed iputs. Go
* through all the delayed iputs here, so that if an unmount happens
* without remounting RW we don't end up at finishing close_ctree()
* with a non-empty list of delayed iputs.
*/
btrfs_run_delayed_iputs(fs_info);
btrfs_dev_replace_suspend_for_unmount(fs_info);
btrfs_scrub_cancel(fs_info);
btrfs_pause_balance(fs_info);
/*
* Pause the qgroup rescan worker if it is running. We don't want it to
* be still running after we are in RO mode, as after that, by the time
* we unmount, it might have left a transaction open, so we would leak
* the transaction and/or crash.
*/
btrfs_qgroup_wait_for_completion(fs_info, false);
return btrfs_commit_super(fs_info);
}
static void btrfs_ctx_to_info(struct btrfs_fs_info *fs_info, struct btrfs_fs_context *ctx)
{
fs_info->max_inline = ctx->max_inline;
fs_info->commit_interval = ctx->commit_interval;
fs_info->metadata_ratio = ctx->metadata_ratio;
fs_info->thread_pool_size = ctx->thread_pool_size;
fs_info->mount_opt = ctx->mount_opt;
fs_info->compress_type = ctx->compress_type;
fs_info->compress_level = ctx->compress_level;
}
static void btrfs_info_to_ctx(struct btrfs_fs_info *fs_info, struct btrfs_fs_context *ctx)
{
ctx->max_inline = fs_info->max_inline;
ctx->commit_interval = fs_info->commit_interval;
ctx->metadata_ratio = fs_info->metadata_ratio;
ctx->thread_pool_size = fs_info->thread_pool_size;
ctx->mount_opt = fs_info->mount_opt;
ctx->compress_type = fs_info->compress_type;
ctx->compress_level = fs_info->compress_level;
}
#define btrfs_info_if_set(fs_info, old_ctx, opt, fmt, args...) \
do { \
if ((!old_ctx || !btrfs_raw_test_opt(old_ctx->mount_opt, opt)) && \
btrfs_raw_test_opt(fs_info->mount_opt, opt)) \
btrfs_info(fs_info, fmt, ##args); \
} while (0)
#define btrfs_info_if_unset(fs_info, old_ctx, opt, fmt, args...) \
do { \
if ((old_ctx && btrfs_raw_test_opt(old_ctx->mount_opt, opt)) && \
!btrfs_raw_test_opt(fs_info->mount_opt, opt)) \
btrfs_info(fs_info, fmt, ##args); \
} while (0)
static void btrfs_emit_options(struct btrfs_fs_info *info,
struct btrfs_fs_context *old)
{
btrfs_info_if_set(info, old, NODATASUM, "setting nodatasum");
btrfs_info_if_set(info, old, DEGRADED, "allowing degraded mounts");
btrfs_info_if_set(info, old, NODATASUM, "setting nodatasum");
btrfs_info_if_set(info, old, SSD, "enabling ssd optimizations");
btrfs_info_if_set(info, old, SSD_SPREAD, "using spread ssd allocation scheme");
btrfs_info_if_set(info, old, NOBARRIER, "turning off barriers");
btrfs_info_if_set(info, old, NOTREELOG, "disabling tree log");
btrfs_info_if_set(info, old, NOLOGREPLAY, "disabling log replay at mount time");
btrfs_info_if_set(info, old, FLUSHONCOMMIT, "turning on flush-on-commit");
btrfs_info_if_set(info, old, DISCARD_SYNC, "turning on sync discard");
btrfs_info_if_set(info, old, DISCARD_ASYNC, "turning on async discard");
btrfs_info_if_set(info, old, FREE_SPACE_TREE, "enabling free space tree");
btrfs_info_if_set(info, old, SPACE_CACHE, "enabling disk space caching");
btrfs_info_if_set(info, old, CLEAR_CACHE, "force clearing of disk cache");
btrfs_info_if_set(info, old, AUTO_DEFRAG, "enabling auto defrag");
btrfs_info_if_set(info, old, FRAGMENT_DATA, "fragmenting data");
btrfs_info_if_set(info, old, FRAGMENT_METADATA, "fragmenting metadata");
btrfs_info_if_set(info, old, REF_VERIFY, "doing ref verification");
btrfs_info_if_set(info, old, USEBACKUPROOT, "trying to use backup root at mount time");
btrfs_info_if_set(info, old, IGNOREBADROOTS, "ignoring bad roots");
btrfs_info_if_set(info, old, IGNOREDATACSUMS, "ignoring data csums");
btrfs_info_if_unset(info, old, NODATACOW, "setting datacow");
btrfs_info_if_unset(info, old, SSD, "not using ssd optimizations");
btrfs_info_if_unset(info, old, SSD_SPREAD, "not using spread ssd allocation scheme");
btrfs_info_if_unset(info, old, NOBARRIER, "turning off barriers");
btrfs_info_if_unset(info, old, NOTREELOG, "enabling tree log");
btrfs_info_if_unset(info, old, SPACE_CACHE, "disabling disk space caching");
btrfs_info_if_unset(info, old, FREE_SPACE_TREE, "disabling free space tree");
btrfs_info_if_unset(info, old, AUTO_DEFRAG, "disabling auto defrag");
btrfs_info_if_unset(info, old, COMPRESS, "use no compression");
/* Did the compression settings change? */
if (btrfs_test_opt(info, COMPRESS) &&
(!old ||
old->compress_type != info->compress_type ||
old->compress_level != info->compress_level ||
(!btrfs_raw_test_opt(old->mount_opt, FORCE_COMPRESS) &&
btrfs_raw_test_opt(info->mount_opt, FORCE_COMPRESS)))) {
const char *compress_type = btrfs_compress_type2str(info->compress_type);
btrfs_info(info, "%s %s compression, level %d",
btrfs_test_opt(info, FORCE_COMPRESS) ? "force" : "use",
compress_type, info->compress_level);
}
if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
btrfs_info(info, "max_inline set to %llu", info->max_inline);
}
static int btrfs_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_fs_context *ctx = fc->fs_private;
struct btrfs_fs_context old_ctx;
int ret = 0;
bool mount_reconfigure = (fc->s_fs_info != NULL);
btrfs_info_to_ctx(fs_info, &old_ctx);
/*
* This is our "bind mount" trick, we don't want to allow the user to do
* anything other than mount a different ro/rw and a different subvol,
* all of the mount options should be maintained.
*/
if (mount_reconfigure)
ctx->mount_opt = old_ctx.mount_opt;
sync_filesystem(sb);
set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
if (!mount_reconfigure &&
!btrfs_check_options(fs_info, &ctx->mount_opt, fc->sb_flags))
return -EINVAL;
ret = btrfs_check_features(fs_info, !(fc->sb_flags & SB_RDONLY));
if (ret < 0)
return ret;
btrfs_ctx_to_info(fs_info, ctx);
btrfs_remount_begin(fs_info, old_ctx.mount_opt, fc->sb_flags);
btrfs_resize_thread_pool(fs_info, fs_info->thread_pool_size,
old_ctx.thread_pool_size);
if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) !=
(bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
(!sb_rdonly(sb) || (fc->sb_flags & SB_RDONLY))) {
btrfs_warn(fs_info,
"remount supports changing free space tree only from RO to RW");
/* Make sure free space cache options match the state on disk. */
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE);
btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
}
if (btrfs_free_space_cache_v1_active(fs_info)) {
btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE);
btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE);
}
}
ret = 0;
if (!sb_rdonly(sb) && (fc->sb_flags & SB_RDONLY))
ret = btrfs_remount_ro(fs_info);
else if (sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY))
ret = btrfs_remount_rw(fs_info);
if (ret)
goto restore;
/*
* If we set the mask during the parameter parsing VFS would reject the
* remount. Here we can set the mask and the value will be updated
* appropriately.
*/
if ((fc->sb_flags & SB_POSIXACL) != (sb->s_flags & SB_POSIXACL))
fc->sb_flags_mask |= SB_POSIXACL;
btrfs_emit_options(fs_info, &old_ctx);
wake_up_process(fs_info->transaction_kthread);
btrfs_remount_cleanup(fs_info, old_ctx.mount_opt);
btrfs_clear_oneshot_options(fs_info);
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
return 0;
restore:
btrfs_ctx_to_info(fs_info, &old_ctx);
btrfs_remount_cleanup(fs_info, old_ctx.mount_opt);
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
return ret;
}
/* Used to sort the devices by max_avail(descending sort) */
static int btrfs_cmp_device_free_bytes(const void *a, const void *b)
{
const struct btrfs_device_info *dev_info1 = a;
const struct btrfs_device_info *dev_info2 = b;
if (dev_info1->max_avail > dev_info2->max_avail)
return -1;
else if (dev_info1->max_avail < dev_info2->max_avail)
return 1;
return 0;
}
/*
* sort the devices by max_avail, in which max free extent size of each device
* is stored.(Descending Sort)
*/
static inline void btrfs_descending_sort_devices(
struct btrfs_device_info *devices,
size_t nr_devices)
{
sort(devices, nr_devices, sizeof(struct btrfs_device_info),
btrfs_cmp_device_free_bytes, NULL);
}
/*
* The helper to calc the free space on the devices that can be used to store
* file data.
*/
static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
u64 *free_bytes)
{
struct btrfs_device_info *devices_info;
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
u64 type;
u64 avail_space;
u64 min_stripe_size;
int num_stripes = 1;
int i = 0, nr_devices;
const struct btrfs_raid_attr *rattr;
/*
* We aren't under the device list lock, so this is racy-ish, but good
* enough for our purposes.
*/
nr_devices = fs_info->fs_devices->open_devices;
if (!nr_devices) {
smp_mb();
nr_devices = fs_info->fs_devices->open_devices;
ASSERT(nr_devices);
if (!nr_devices) {
*free_bytes = 0;
return 0;
}
}
devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
GFP_KERNEL);
if (!devices_info)
return -ENOMEM;
/* calc min stripe number for data space allocation */
type = btrfs_data_alloc_profile(fs_info);
rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)];
if (type & BTRFS_BLOCK_GROUP_RAID0)
num_stripes = nr_devices;
else if (type & BTRFS_BLOCK_GROUP_RAID1_MASK)
num_stripes = rattr->ncopies;
else if (type & BTRFS_BLOCK_GROUP_RAID10)
num_stripes = 4;
/* Adjust for more than 1 stripe per device */
min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN;
rcu_read_lock();
list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
&device->dev_state) ||
!device->bdev ||
test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
continue;
if (i >= nr_devices)
break;
avail_space = device->total_bytes - device->bytes_used;
/* align with stripe_len */
avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN);
/*
* Ensure we have at least min_stripe_size on top of the
* reserved space on the device.
*/
if (avail_space <= BTRFS_DEVICE_RANGE_RESERVED + min_stripe_size)
continue;
avail_space -= BTRFS_DEVICE_RANGE_RESERVED;
devices_info[i].dev = device;
devices_info[i].max_avail = avail_space;
i++;
}
rcu_read_unlock();
nr_devices = i;
btrfs_descending_sort_devices(devices_info, nr_devices);
i = nr_devices - 1;
avail_space = 0;
while (nr_devices >= rattr->devs_min) {
num_stripes = min(num_stripes, nr_devices);
if (devices_info[i].max_avail >= min_stripe_size) {
int j;
u64 alloc_size;
avail_space += devices_info[i].max_avail * num_stripes;
alloc_size = devices_info[i].max_avail;
for (j = i + 1 - num_stripes; j <= i; j++)
devices_info[j].max_avail -= alloc_size;
}
i--;
nr_devices--;
}
kfree(devices_info);
*free_bytes = avail_space;
return 0;
}
/*
* Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
*
* If there's a redundant raid level at DATA block groups, use the respective
* multiplier to scale the sizes.
*
* Unused device space usage is based on simulating the chunk allocator
* algorithm that respects the device sizes and order of allocations. This is
* a close approximation of the actual use but there are other factors that may
* change the result (like a new metadata chunk).
*
* If metadata is exhausted, f_bavail will be 0.
*/
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
struct btrfs_super_block *disk_super = fs_info->super_copy;
struct btrfs_space_info *found;
u64 total_used = 0;
u64 total_free_data = 0;
u64 total_free_meta = 0;
u32 bits = fs_info->sectorsize_bits;
__be32 *fsid = (__be32 *)fs_info->fs_devices->fsid;
unsigned factor = 1;
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
int ret;
u64 thresh = 0;
int mixed = 0;
list_for_each_entry(found, &fs_info->space_info, list) {
if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
int i;
total_free_data += found->disk_total - found->disk_used;
total_free_data -=
btrfs_account_ro_block_groups_free_space(found);
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
if (!list_empty(&found->block_groups[i]))
factor = btrfs_bg_type_to_factor(
btrfs_raid_array[i].bg_flag);
}
}
/*
* Metadata in mixed block group profiles are accounted in data
*/
if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) {
if (found->flags & BTRFS_BLOCK_GROUP_DATA)
mixed = 1;
else
total_free_meta += found->disk_total -
found->disk_used;
}
total_used += found->disk_used;
}
buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor);
buf->f_blocks >>= bits;
buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits);
/* Account global block reserve as used, it's in logical size already */
spin_lock(&block_rsv->lock);
/* Mixed block groups accounting is not byte-accurate, avoid overflow */
if (buf->f_bfree >= block_rsv->size >> bits)
buf->f_bfree -= block_rsv->size >> bits;
else
buf->f_bfree = 0;
spin_unlock(&block_rsv->lock);
buf->f_bavail = div_u64(total_free_data, factor);
ret = btrfs_calc_avail_data_space(fs_info, &total_free_data);
if (ret)
return ret;
buf->f_bavail += div_u64(total_free_data, factor);
buf->f_bavail = buf->f_bavail >> bits;
/*
* We calculate the remaining metadata space minus global reserve. If
* this is (supposedly) smaller than zero, there's no space. But this
* does not hold in practice, the exhausted state happens where's still
* some positive delta. So we apply some guesswork and compare the
* delta to a 4M threshold. (Practically observed delta was ~2M.)
*
* We probably cannot calculate the exact threshold value because this
* depends on the internal reservations requested by various
* operations, so some operations that consume a few metadata will
* succeed even if the Avail is zero. But this is better than the other
* way around.
*/
thresh = SZ_4M;
/*
* We only want to claim there's no available space if we can no longer
* allocate chunks for our metadata profile and our global reserve will
* not fit in the free metadata space. If we aren't ->full then we
* still can allocate chunks and thus are fine using the currently
* calculated f_bavail.
*/
if (!mixed && block_rsv->space_info->full &&
(total_free_meta < thresh || total_free_meta - thresh < block_rsv->size))
buf->f_bavail = 0;
buf->f_type = BTRFS_SUPER_MAGIC;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_namelen = BTRFS_NAME_LEN;
/* We treat it as constant endianness (it doesn't matter _which_)
because we want the fsid to come out the same whether mounted
on a big-endian or little-endian host */
buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
/* Mask in the root object ID too, to disambiguate subvols */
buf->f_fsid.val[0] ^=
BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32;
buf->f_fsid.val[1] ^=
BTRFS_I(d_inode(dentry))->root->root_key.objectid;
return 0;
}
static int btrfs_fc_test_super(struct super_block *sb, struct fs_context *fc)
{
struct btrfs_fs_info *p = fc->s_fs_info;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
return fs_info->fs_devices == p->fs_devices;
}
static int btrfs_get_tree_super(struct fs_context *fc)
{
struct btrfs_fs_info *fs_info = fc->s_fs_info;
struct btrfs_fs_context *ctx = fc->fs_private;
struct btrfs_fs_devices *fs_devices = NULL;
struct block_device *bdev;
struct btrfs_device *device;
struct super_block *sb;
blk_mode_t mode = sb_open_mode(fc->sb_flags);
int ret;
btrfs_ctx_to_info(fs_info, ctx);
mutex_lock(&uuid_mutex);
/*
* With 'true' passed to btrfs_scan_one_device() (mount time) we expect
* either a valid device or an error.
*/
device = btrfs_scan_one_device(fc->source, mode, true);
ASSERT(device != NULL);
if (IS_ERR(device)) {
mutex_unlock(&uuid_mutex);
return PTR_ERR(device);
}
fs_devices = device->fs_devices;
fs_info->fs_devices = fs_devices;
ret = btrfs_open_devices(fs_devices, mode, &btrfs_fs_type);
mutex_unlock(&uuid_mutex);
if (ret)
return ret;
if (!(fc->sb_flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
ret = -EACCES;
goto error;
}
bdev = fs_devices->latest_dev->bdev;
/*
* From now on the error handling is not straightforward.
*
* If successful, this will transfer the fs_info into the super block,
* and fc->s_fs_info will be NULL. However if there's an existing
* super, we'll still have fc->s_fs_info populated. If we error
* completely out it'll be cleaned up when we drop the fs_context,
* otherwise it's tied to the lifetime of the super_block.
*/
sb = sget_fc(fc, btrfs_fc_test_super, set_anon_super_fc);
if (IS_ERR(sb)) {
ret = PTR_ERR(sb);
goto error;
}
set_device_specific_options(fs_info);
if (sb->s_root) {
btrfs_close_devices(fs_devices);
if ((fc->sb_flags ^ sb->s_flags) & SB_RDONLY)
ret = -EBUSY;
} else {
snprintf(sb->s_id, sizeof(sb->s_id), "%pg", bdev);
shrinker_debugfs_rename(sb->s_shrink, "sb-btrfs:%s", sb->s_id);
btrfs_sb(sb)->bdev_holder = &btrfs_fs_type;
ret = btrfs_fill_super(sb, fs_devices, NULL);
}
if (ret) {
deactivate_locked_super(sb);
return ret;
}
btrfs_clear_oneshot_options(fs_info);
fc->root = dget(sb->s_root);
return 0;
error:
btrfs_close_devices(fs_devices);
return ret;
}
/*
* Ever since commit 0723a0473fb4 ("btrfs: allow mounting btrfs subvolumes
* with different ro/rw options") the following works:
*
* (i) mount /dev/sda3 -o subvol=foo,ro /mnt/foo
* (ii) mount /dev/sda3 -o subvol=bar,rw /mnt/bar
*
* which looks nice and innocent but is actually pretty intricate and deserves
* a long comment.
*
* On another filesystem a subvolume mount is close to something like:
*
* (iii) # create rw superblock + initial mount
* mount -t xfs /dev/sdb /opt/
*
* # create ro bind mount
* mount --bind -o ro /opt/foo /mnt/foo
*
* # unmount initial mount
* umount /opt
*
* Of course, there's some special subvolume sauce and there's the fact that the
* sb->s_root dentry is really swapped after mount_subtree(). But conceptually
* it's very close and will help us understand the issue.
*
* The old mount API didn't cleanly distinguish between a mount being made ro
* and a superblock being made ro. The only way to change the ro state of
* either object was by passing ms_rdonly. If a new mount was created via
* mount(2) such as:
*
* mount("/dev/sdb", "/mnt", "xfs", ms_rdonly, null);
*
* the MS_RDONLY flag being specified had two effects:
*
* (1) MNT_READONLY was raised -> the resulting mount got
* @mnt->mnt_flags |= MNT_READONLY raised.
*
* (2) MS_RDONLY was passed to the filesystem's mount method and the filesystems
* made the superblock ro. Note, how SB_RDONLY has the same value as
* ms_rdonly and is raised whenever MS_RDONLY is passed through mount(2).
*
* Creating a subtree mount via (iii) ends up leaving a rw superblock with a
* subtree mounted ro.
*
* But consider the effect on the old mount API on btrfs subvolume mounting
* which combines the distinct step in (iii) into a single step.
*
* By issuing (i) both the mount and the superblock are turned ro. Now when (ii)
* is issued the superblock is ro and thus even if the mount created for (ii) is
* rw it wouldn't help. Hence, btrfs needed to transition the superblock from ro
* to rw for (ii) which it did using an internal remount call.
*
* IOW, subvolume mounting was inherently complicated due to the ambiguity of
* MS_RDONLY in mount(2). Note, this ambiguity has mount(8) always translate
* "ro" to MS_RDONLY. IOW, in both (i) and (ii) "ro" becomes MS_RDONLY when
* passed by mount(8) to mount(2).
*
* Enter the new mount API. The new mount API disambiguates making a mount ro
* and making a superblock ro.
*
* (3) To turn a mount ro the MOUNT_ATTR_ONLY flag can be used with either
* fsmount() or mount_setattr() this is a pure VFS level change for a
* specific mount or mount tree that is never seen by the filesystem itself.
*
* (4) To turn a superblock ro the "ro" flag must be used with
* fsconfig(FSCONFIG_SET_FLAG, "ro"). This option is seen by the filesystem
* in fc->sb_flags.
*
* This disambiguation has rather positive consequences. Mounting a subvolume
* ro will not also turn the superblock ro. Only the mount for the subvolume
* will become ro.
*
* So, if the superblock creation request comes from the new mount API the
* caller must have explicitly done:
*
* fsconfig(FSCONFIG_SET_FLAG, "ro")
* fsmount/mount_setattr(MOUNT_ATTR_RDONLY)
*
* IOW, at some point the caller must have explicitly turned the whole
* superblock ro and we shouldn't just undo it like we did for the old mount
* API. In any case, it lets us avoid the hack in the new mount API.
*
* Consequently, the remounting hack must only be used for requests originating
* from the old mount API and should be marked for full deprecation so it can be
* turned off in a couple of years.
*
* The new mount API has no reason to support this hack.
*/
static struct vfsmount *btrfs_reconfigure_for_mount(struct fs_context *fc)
{
struct vfsmount *mnt;
int ret;
const bool ro2rw = !(fc->sb_flags & SB_RDONLY);
/*
* We got an EBUSY because our SB_RDONLY flag didn't match the existing
* super block, so invert our setting here and retry the mount so we
* can get our vfsmount.
*/
if (ro2rw)
fc->sb_flags |= SB_RDONLY;
else
fc->sb_flags &= ~SB_RDONLY;
mnt = fc_mount(fc);
if (IS_ERR(mnt))
return mnt;
if (!fc->oldapi || !ro2rw)
return mnt;
/* We need to convert to rw, call reconfigure. */
fc->sb_flags &= ~SB_RDONLY;
down_write(&mnt->mnt_sb->s_umount);
ret = btrfs_reconfigure(fc);
up_write(&mnt->mnt_sb->s_umount);
if (ret) {
mntput(mnt);
return ERR_PTR(ret);
}
return mnt;
}
static int btrfs_get_tree_subvol(struct fs_context *fc)
{
struct btrfs_fs_info *fs_info = NULL;
struct btrfs_fs_context *ctx = fc->fs_private;
struct fs_context *dup_fc;
struct dentry *dentry;
struct vfsmount *mnt;
/*
* Setup a dummy root and fs_info for test/set super. This is because
* we don't actually fill this stuff out until open_ctree, but we need
* then open_ctree will properly initialize the file system specific
* settings later. btrfs_init_fs_info initializes the static elements
* of the fs_info (locks and such) to make cleanup easier if we find a
* superblock with our given fs_devices later on at sget() time.
*/
fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
if (!fs_info)
return -ENOMEM;
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
if (!fs_info->super_copy || !fs_info->super_for_commit) {
btrfs_free_fs_info(fs_info);
return -ENOMEM;
}
btrfs_init_fs_info(fs_info);
dup_fc = vfs_dup_fs_context(fc);
if (IS_ERR(dup_fc)) {
btrfs_free_fs_info(fs_info);
return PTR_ERR(dup_fc);
}
/*
* When we do the sget_fc this gets transferred to the sb, so we only
* need to set it on the dup_fc as this is what creates the super block.
*/
dup_fc->s_fs_info = fs_info;
/*
* We'll do the security settings in our btrfs_get_tree_super() mount
* loop, they were duplicated into dup_fc, we can drop the originals
* here.
*/
security_free_mnt_opts(&fc->security);
fc->security = NULL;
mnt = fc_mount(dup_fc);
if (PTR_ERR_OR_ZERO(mnt) == -EBUSY)
mnt = btrfs_reconfigure_for_mount(dup_fc);
put_fs_context(dup_fc);
if (IS_ERR(mnt))
return PTR_ERR(mnt);
/*
* This free's ->subvol_name, because if it isn't set we have to
* allocate a buffer to hold the subvol_name, so we just drop our
* reference to it here.
*/
dentry = mount_subvol(ctx->subvol_name, ctx->subvol_objectid, mnt);
ctx->subvol_name = NULL;
if (IS_ERR(dentry))
return PTR_ERR(dentry);
fc->root = dentry;
return 0;
}
static int btrfs_get_tree(struct fs_context *fc)
{
/*
* Since we use mount_subtree to mount the default/specified subvol, we
* have to do mounts in two steps.
*
* First pass through we call btrfs_get_tree_subvol(), this is just a
* wrapper around fc_mount() to call back into here again, and this time
* we'll call btrfs_get_tree_super(). This will do the open_ctree() and
* everything to open the devices and file system. Then we return back
* with a fully constructed vfsmount in btrfs_get_tree_subvol(), and
* from there we can do our mount_subvol() call, which will lookup
* whichever subvol we're mounting and setup this fc with the
* appropriate dentry for the subvol.
*/
if (fc->s_fs_info)
return btrfs_get_tree_super(fc);
return btrfs_get_tree_subvol(fc);
}
static void btrfs_kill_super(struct super_block *sb)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
kill_anon_super(sb);
btrfs_free_fs_info(fs_info);
}
static void btrfs_free_fs_context(struct fs_context *fc)
{
struct btrfs_fs_context *ctx = fc->fs_private;
struct btrfs_fs_info *fs_info = fc->s_fs_info;
if (fs_info)
btrfs_free_fs_info(fs_info);
if (ctx && refcount_dec_and_test(&ctx->refs)) {
kfree(ctx->subvol_name);
kfree(ctx);
}
}
static int btrfs_dup_fs_context(struct fs_context *fc, struct fs_context *src_fc)
{
struct btrfs_fs_context *ctx = src_fc->fs_private;
/*
* Give a ref to our ctx to this dup, as we want to keep it around for
* our original fc so we can have the subvolume name or objectid.
*
* We unset ->source in the original fc because the dup needs it for
* mounting, and then once we free the dup it'll free ->source, so we
* need to make sure we're only pointing to it in one fc.
*/
refcount_inc(&ctx->refs);
fc->fs_private = ctx;
fc->source = src_fc->source;
src_fc->source = NULL;
return 0;
}
static const struct fs_context_operations btrfs_fs_context_ops = {
.parse_param = btrfs_parse_param,
.reconfigure = btrfs_reconfigure,
.get_tree = btrfs_get_tree,
.dup = btrfs_dup_fs_context,
.free = btrfs_free_fs_context,
};
static int btrfs_init_fs_context(struct fs_context *fc)
{
struct btrfs_fs_context *ctx;
ctx = kzalloc(sizeof(struct btrfs_fs_context), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
refcount_set(&ctx->refs, 1);
fc->fs_private = ctx;
fc->ops = &btrfs_fs_context_ops;
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
btrfs_info_to_ctx(btrfs_sb(fc->root->d_sb), ctx);
} else {
ctx->thread_pool_size =
min_t(unsigned long, num_online_cpus() + 2, 8);
ctx->max_inline = BTRFS_DEFAULT_MAX_INLINE;
ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
}
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#endif
fc->sb_flags |= SB_I_VERSION;
return 0;
}
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.init_fs_context = btrfs_init_fs_context,
.parameters = btrfs_fs_parameters,
.kill_sb = btrfs_kill_super,
.fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP,
};
MODULE_ALIAS_FS("btrfs");
static int btrfs_control_open(struct inode *inode, struct file *file)
{
/*
* The control file's private_data is used to hold the
* transaction when it is started and is used to keep
* track of whether a transaction is already in progress.
*/
file->private_data = NULL;
return 0;
}
/*
* Used by /dev/btrfs-control for devices ioctls.
*/
static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct btrfs_ioctl_vol_args *vol;
struct btrfs_device *device = NULL;
dev_t devt = 0;
int ret = -ENOTTY;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vol = memdup_user((void __user *)arg, sizeof(*vol));
if (IS_ERR(vol))
return PTR_ERR(vol);
vol->name[BTRFS_PATH_NAME_MAX] = '\0';
switch (cmd) {
case BTRFS_IOC_SCAN_DEV:
mutex_lock(&uuid_mutex);
/*
* Scanning outside of mount can return NULL which would turn
* into 0 error code.
*/
device = btrfs_scan_one_device(vol->name, BLK_OPEN_READ, false);
ret = PTR_ERR_OR_ZERO(device);
mutex_unlock(&uuid_mutex);
break;
case BTRFS_IOC_FORGET_DEV:
if (vol->name[0] != 0) {
ret = lookup_bdev(vol->name, &devt);
if (ret)
break;
}
ret = btrfs_forget_devices(devt);
break;
case BTRFS_IOC_DEVICES_READY:
mutex_lock(&uuid_mutex);
/*
* Scanning outside of mount can return NULL which would turn
* into 0 error code.
*/
device = btrfs_scan_one_device(vol->name, BLK_OPEN_READ, false);
if (IS_ERR_OR_NULL(device)) {
mutex_unlock(&uuid_mutex);
ret = PTR_ERR(device);
break;
}
ret = !(device->fs_devices->num_devices ==
device->fs_devices->total_devices);
mutex_unlock(&uuid_mutex);
break;
case BTRFS_IOC_GET_SUPPORTED_FEATURES:
ret = btrfs_ioctl_get_supported_features((void __user*)arg);
break;
}
kfree(vol);
return ret;
}
static int btrfs_freeze(struct super_block *sb)
{
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
set_bit(BTRFS_FS_FROZEN, &fs_info->flags);
/*
* We don't need a barrier here, we'll wait for any transaction that
* could be in progress on other threads (and do delayed iputs that
* we want to avoid on a frozen filesystem), or do the commit
* ourselves.
*/
trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {
/* no transaction, don't bother */
if (PTR_ERR(trans) == -ENOENT)
return 0;
return PTR_ERR(trans);
}
return btrfs_commit_transaction(trans);
}
static int check_dev_super(struct btrfs_device *dev)
{
struct btrfs_fs_info *fs_info = dev->fs_info;
struct btrfs_super_block *sb;
u64 last_trans;
u16 csum_type;
int ret = 0;
/* This should be called with fs still frozen. */
ASSERT(test_bit(BTRFS_FS_FROZEN, &fs_info->flags));
/* Missing dev, no need to check. */
if (!dev->bdev)
return 0;
/* Only need to check the primary super block. */
sb = btrfs_read_dev_one_super(dev->bdev, 0, true);
if (IS_ERR(sb))
return PTR_ERR(sb);
/* Verify the checksum. */
csum_type = btrfs_super_csum_type(sb);
if (csum_type != btrfs_super_csum_type(fs_info->super_copy)) {
btrfs_err(fs_info, "csum type changed, has %u expect %u",
csum_type, btrfs_super_csum_type(fs_info->super_copy));
ret = -EUCLEAN;
goto out;
}
if (btrfs_check_super_csum(fs_info, sb)) {
btrfs_err(fs_info, "csum for on-disk super block no longer matches");
ret = -EUCLEAN;
goto out;
}
/* Btrfs_validate_super() includes fsid check against super->fsid. */
ret = btrfs_validate_super(fs_info, sb, 0);
if (ret < 0)
goto out;
last_trans = btrfs_get_last_trans_committed(fs_info);
if (btrfs_super_generation(sb) != last_trans) {
btrfs_err(fs_info, "transid mismatch, has %llu expect %llu",
btrfs_super_generation(sb), last_trans);
ret = -EUCLEAN;
goto out;
}
out:
btrfs_release_disk_super(sb);
return ret;
}
static int btrfs_unfreeze(struct super_block *sb)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_device *device;
int ret = 0;
/*
* Make sure the fs is not changed by accident (like hibernation then
* modified by other OS).
* If we found anything wrong, we mark the fs error immediately.
*
* And since the fs is frozen, no one can modify the fs yet, thus
* we don't need to hold device_list_mutex.
*/
list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
ret = check_dev_super(device);
if (ret < 0) {
btrfs_handle_fs_error(fs_info, ret,
"super block on devid %llu got modified unexpectedly",
device->devid);
break;
}
}
clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
/*
* We still return 0, to allow VFS layer to unfreeze the fs even the
* above checks failed. Since the fs is either fine or read-only, we're
* safe to continue, without causing further damage.
*/
return 0;
}
static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
{
struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
/*
* There should be always a valid pointer in latest_dev, it may be stale
* for a short moment in case it's being deleted but still valid until
* the end of RCU grace period.
*/
rcu_read_lock();
seq_escape(m, btrfs_dev_name(fs_info->fs_devices->latest_dev), " \t\n\\");
rcu_read_unlock();
return 0;
}
static const struct super_operations btrfs_super_ops = {
.drop_inode = btrfs_drop_inode,
.evict_inode = btrfs_evict_inode,
.put_super = btrfs_put_super,
.sync_fs = btrfs_sync_fs,
.show_options = btrfs_show_options,
.show_devname = btrfs_show_devname,
.alloc_inode = btrfs_alloc_inode,
.destroy_inode = btrfs_destroy_inode,
.free_inode = btrfs_free_inode,
.statfs = btrfs_statfs,
.freeze_fs = btrfs_freeze,
.unfreeze_fs = btrfs_unfreeze,
};
static const struct file_operations btrfs_ctl_fops = {
.open = btrfs_control_open,
.unlocked_ioctl = btrfs_control_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.owner = THIS_MODULE,
.llseek = noop_llseek,
};
static struct miscdevice btrfs_misc = {
.minor = BTRFS_MINOR,
.name = "btrfs-control",
.fops = &btrfs_ctl_fops
};
MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
MODULE_ALIAS("devname:btrfs-control");
static int __init btrfs_interface_init(void)
{
return misc_register(&btrfs_misc);
}
static __cold void btrfs_interface_exit(void)
{
misc_deregister(&btrfs_misc);
}
static int __init btrfs_print_mod_info(void)
{
static const char options[] = ""
#ifdef CONFIG_BTRFS_DEBUG
", debug=on"
#endif
#ifdef CONFIG_BTRFS_ASSERT
", assert=on"
#endif
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
", ref-verify=on"
#endif
#ifdef CONFIG_BLK_DEV_ZONED
", zoned=yes"
#else
", zoned=no"
#endif
#ifdef CONFIG_FS_VERITY
", fsverity=yes"
#else
", fsverity=no"
#endif
;
pr_info("Btrfs loaded%s\n", options);
return 0;
}
static int register_btrfs(void)
{
return register_filesystem(&btrfs_fs_type);
}
static void unregister_btrfs(void)
{
unregister_filesystem(&btrfs_fs_type);
}
/* Helper structure for long init/exit functions. */
struct init_sequence {
int (*init_func)(void);
/* Can be NULL if the init_func doesn't need cleanup. */
void (*exit_func)(void);
};
static const struct init_sequence mod_init_seq[] = {
{
.init_func = btrfs_props_init,
.exit_func = NULL,
}, {
.init_func = btrfs_init_sysfs,
.exit_func = btrfs_exit_sysfs,
}, {
.init_func = btrfs_init_compress,
.exit_func = btrfs_exit_compress,
}, {
.init_func = btrfs_init_cachep,
.exit_func = btrfs_destroy_cachep,
}, {
.init_func = btrfs_transaction_init,
.exit_func = btrfs_transaction_exit,
}, {
.init_func = btrfs_ctree_init,
.exit_func = btrfs_ctree_exit,
}, {
.init_func = btrfs_free_space_init,
.exit_func = btrfs_free_space_exit,
}, {
.init_func = extent_state_init_cachep,
.exit_func = extent_state_free_cachep,
}, {
.init_func = extent_buffer_init_cachep,
.exit_func = extent_buffer_free_cachep,
}, {
.init_func = btrfs_bioset_init,
.exit_func = btrfs_bioset_exit,
}, {
.init_func = extent_map_init,
.exit_func = extent_map_exit,
}, {
.init_func = ordered_data_init,
.exit_func = ordered_data_exit,
}, {
.init_func = btrfs_delayed_inode_init,
.exit_func = btrfs_delayed_inode_exit,
}, {
.init_func = btrfs_auto_defrag_init,
.exit_func = btrfs_auto_defrag_exit,
}, {
.init_func = btrfs_delayed_ref_init,
.exit_func = btrfs_delayed_ref_exit,
}, {
.init_func = btrfs_prelim_ref_init,
.exit_func = btrfs_prelim_ref_exit,
}, {
.init_func = btrfs_interface_init,
.exit_func = btrfs_interface_exit,
}, {
.init_func = btrfs_print_mod_info,
.exit_func = NULL,
}, {
.init_func = btrfs_run_sanity_tests,
.exit_func = NULL,
}, {
.init_func = register_btrfs,
.exit_func = unregister_btrfs,
}
};
static bool mod_init_result[ARRAY_SIZE(mod_init_seq)];
static __always_inline void btrfs_exit_btrfs_fs(void)
{
int i;
for (i = ARRAY_SIZE(mod_init_seq) - 1; i >= 0; i--) {
if (!mod_init_result[i])
continue;
if (mod_init_seq[i].exit_func)
mod_init_seq[i].exit_func();
mod_init_result[i] = false;
}
}
static void __exit exit_btrfs_fs(void)
{
btrfs_exit_btrfs_fs();
btrfs_cleanup_fs_uuids();
}
static int __init init_btrfs_fs(void)
{
int ret;
int i;
for (i = 0; i < ARRAY_SIZE(mod_init_seq); i++) {
ASSERT(!mod_init_result[i]);
ret = mod_init_seq[i].init_func();
if (ret < 0) {
btrfs_exit_btrfs_fs();
return ret;
}
mod_init_result[i] = true;
}
return 0;
}
late_initcall(init_btrfs_fs);
module_exit(exit_btrfs_fs)
MODULE_LICENSE("GPL");
MODULE_SOFTDEP("pre: crc32c");
MODULE_SOFTDEP("pre: xxhash64");
MODULE_SOFTDEP("pre: sha256");
MODULE_SOFTDEP("pre: blake2b-256");