#include <trace/events/btrfs.h>
static const struct super_operations btrfs_super_ops;
-
-/*
- * Types for mounting the default subvolume and a subvolume explicitly
- * requested by subvol=/path. That way the callchain is straightforward and we
- * don't have to play tricks with the mount options and recursive calls to
- * btrfs_mount.
- *
- * The new btrfs_root_fs_type also servers as a tag for the bdev_holder.
- */
static struct file_system_type btrfs_fs_type;
-static struct file_system_type btrfs_root_fs_type;
-
-static int btrfs_remount(struct super_block *sb, int *flags, char *data);
static void btrfs_put_super(struct super_block *sb)
{
};
enum {
- Opt_acl, Opt_noacl,
+ Opt_acl,
Opt_clear_cache,
Opt_commit_interval,
Opt_compress,
Opt_degraded,
Opt_device,
Opt_fatal_errors,
- Opt_flushoncommit, Opt_noflushoncommit,
+ Opt_flushoncommit,
Opt_max_inline,
- Opt_barrier, Opt_nobarrier,
- Opt_datacow, Opt_nodatacow,
- Opt_datasum, Opt_nodatasum,
- Opt_defrag, Opt_nodefrag,
- Opt_discard, Opt_nodiscard,
+ Opt_barrier,
+ Opt_datacow,
+ Opt_datasum,
+ Opt_defrag,
+ Opt_discard,
Opt_discard_mode,
- Opt_norecovery,
Opt_ratio,
Opt_rescan_uuid_tree,
Opt_skip_balance,
- Opt_space_cache, Opt_no_space_cache,
+ Opt_space_cache,
Opt_space_cache_version,
- Opt_ssd, Opt_nossd,
- Opt_ssd_spread, Opt_nossd_spread,
+ Opt_ssd,
+ Opt_ssd_spread,
Opt_subvol,
Opt_subvol_empty,
Opt_subvolid,
Opt_thread_pool,
- Opt_treelog, Opt_notreelog,
+ Opt_treelog,
Opt_user_subvol_rm_allowed,
/* Rescue options */
/* Deprecated options */
Opt_recovery,
- Opt_inode_cache, Opt_noinode_cache,
+ Opt_inode_cache,
/* Debugging options */
- Opt_enospc_debug, Opt_noenospc_debug,
+ Opt_enospc_debug,
#ifdef CONFIG_BTRFS_DEBUG
Opt_fragment, Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
#endif
Opt_err,
};
-static const match_table_t tokens = {
- {Opt_acl, "acl"},
- {Opt_noacl, "noacl"},
- {Opt_clear_cache, "clear_cache"},
- {Opt_commit_interval, "commit=%u"},
- {Opt_compress, "compress"},
- {Opt_compress_type, "compress=%s"},
- {Opt_compress_force, "compress-force"},
- {Opt_compress_force_type, "compress-force=%s"},
- {Opt_degraded, "degraded"},
- {Opt_device, "device=%s"},
- {Opt_fatal_errors, "fatal_errors=%s"},
- {Opt_flushoncommit, "flushoncommit"},
- {Opt_noflushoncommit, "noflushoncommit"},
- {Opt_inode_cache, "inode_cache"},
- {Opt_noinode_cache, "noinode_cache"},
- {Opt_max_inline, "max_inline=%s"},
- {Opt_barrier, "barrier"},
- {Opt_nobarrier, "nobarrier"},
- {Opt_datacow, "datacow"},
- {Opt_nodatacow, "nodatacow"},
- {Opt_datasum, "datasum"},
- {Opt_nodatasum, "nodatasum"},
- {Opt_defrag, "autodefrag"},
- {Opt_nodefrag, "noautodefrag"},
- {Opt_discard, "discard"},
- {Opt_discard_mode, "discard=%s"},
- {Opt_nodiscard, "nodiscard"},
- {Opt_norecovery, "norecovery"},
- {Opt_ratio, "metadata_ratio=%u"},
- {Opt_rescan_uuid_tree, "rescan_uuid_tree"},
- {Opt_skip_balance, "skip_balance"},
- {Opt_space_cache, "space_cache"},
- {Opt_no_space_cache, "nospace_cache"},
- {Opt_space_cache_version, "space_cache=%s"},
- {Opt_ssd, "ssd"},
- {Opt_nossd, "nossd"},
- {Opt_ssd_spread, "ssd_spread"},
- {Opt_nossd_spread, "nossd_spread"},
- {Opt_subvol, "subvol=%s"},
- {Opt_subvol_empty, "subvol="},
- {Opt_subvolid, "subvolid=%s"},
- {Opt_thread_pool, "thread_pool=%u"},
- {Opt_treelog, "treelog"},
- {Opt_notreelog, "notreelog"},
- {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
-
- /* Rescue options */
- {Opt_rescue, "rescue=%s"},
- /* Deprecated, with alias rescue=nologreplay */
- {Opt_nologreplay, "nologreplay"},
- /* Deprecated, with alias rescue=usebackuproot */
- {Opt_usebackuproot, "usebackuproot"},
-
- /* Deprecated options */
- {Opt_recovery, "recovery"},
-
- /* Debugging options */
- {Opt_enospc_debug, "enospc_debug"},
- {Opt_noenospc_debug, "noenospc_debug"},
-#ifdef CONFIG_BTRFS_DEBUG
- {Opt_fragment_data, "fragment=data"},
- {Opt_fragment_metadata, "fragment=metadata"},
- {Opt_fragment_all, "fragment=all"},
-#endif
-#ifdef CONFIG_BTRFS_FS_REF_VERIFY
- {Opt_ref_verify, "ref_verify"},
-#endif
- {Opt_err, NULL},
-};
-
-static const match_table_t rescue_tokens = {
- {Opt_usebackuproot, "usebackuproot"},
- {Opt_nologreplay, "nologreplay"},
- {Opt_ignorebadroots, "ignorebadroots"},
- {Opt_ignorebadroots, "ibadroots"},
- {Opt_ignoredatacsums, "ignoredatacsums"},
- {Opt_ignoredatacsums, "idatacsums"},
- {Opt_rescue_all, "all"},
- {Opt_err, NULL},
-};
-
enum {
Opt_fatal_errors_panic,
Opt_fatal_errors_bug,
btrfs_set_opt(fs_info->mount_opt, DISCARD_ASYNC);
}
-static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
-{
- char *opts;
- char *orig;
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int ret = 0;
-
- opts = kstrdup(options, GFP_KERNEL);
- if (!opts)
- return -ENOMEM;
- orig = opts;
-
- while ((p = strsep(&opts, ":")) != NULL) {
- int token;
-
- if (!*p)
- continue;
- token = match_token(p, rescue_tokens, args);
- switch (token){
- case Opt_usebackuproot:
- btrfs_info(info,
- "trying to use backup root at mount time");
- btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
- break;
- case Opt_nologreplay:
- btrfs_set_and_info(info, NOLOGREPLAY,
- "disabling log replay at mount time");
- break;
- case Opt_ignorebadroots:
- btrfs_set_and_info(info, IGNOREBADROOTS,
- "ignoring bad roots");
- break;
- case Opt_ignoredatacsums:
- btrfs_set_and_info(info, IGNOREDATACSUMS,
- "ignoring data csums");
- break;
- case Opt_rescue_all:
- btrfs_info(info, "enabling all of the rescue options");
- btrfs_set_and_info(info, IGNOREDATACSUMS,
- "ignoring data csums");
- btrfs_set_and_info(info, IGNOREBADROOTS,
- "ignoring bad roots");
- btrfs_set_and_info(info, NOLOGREPLAY,
- "disabling log replay at mount time");
- break;
- case Opt_err:
- btrfs_info(info, "unrecognized rescue option '%s'", p);
- ret = -EINVAL;
- goto out;
- default:
- break;
- }
-
- }
-out:
- kfree(orig);
- return ret;
-}
-
-/*
- * Regular mount options parser. Everything that is needed only when
- * reading in a new superblock is parsed here.
- * XXX JDM: This needs to be cleaned up for remount.
- */
-int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
- unsigned long new_flags)
-{
- substring_t args[MAX_OPT_ARGS];
- char *p, *num;
- int intarg;
- int ret = 0;
- char *compress_type;
- bool compress_force = false;
- enum btrfs_compression_type saved_compress_type;
- int saved_compress_level;
- bool saved_compress_force;
- int no_compress = 0;
-
- /*
- * Even the options are empty, we still need to do extra check
- * against new flags
- */
- if (!options)
- goto out;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_degraded:
- btrfs_info(info, "allowing degraded mounts");
- btrfs_set_opt(info->mount_opt, DEGRADED);
- break;
- case Opt_subvol:
- case Opt_subvol_empty:
- case Opt_subvolid:
- case Opt_device:
- /*
- * These are parsed by btrfs_parse_subvol_options or
- * btrfs_parse_device_options and can be ignored here.
- */
- break;
- case Opt_nodatasum:
- btrfs_set_and_info(info, NODATASUM,
- "setting nodatasum");
- break;
- case Opt_datasum:
- if (btrfs_test_opt(info, NODATASUM)) {
- if (btrfs_test_opt(info, NODATACOW))
- btrfs_info(info,
- "setting datasum, datacow enabled");
- else
- btrfs_info(info, "setting datasum");
- }
- btrfs_clear_opt(info->mount_opt, NODATACOW);
- btrfs_clear_opt(info->mount_opt, NODATASUM);
- break;
- case Opt_nodatacow:
- if (!btrfs_test_opt(info, NODATACOW)) {
- if (!btrfs_test_opt(info, COMPRESS) ||
- !btrfs_test_opt(info, FORCE_COMPRESS)) {
- btrfs_info(info,
- "setting nodatacow, compression disabled");
- } else {
- btrfs_info(info, "setting nodatacow");
- }
- }
- btrfs_clear_opt(info->mount_opt, COMPRESS);
- btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
- btrfs_set_opt(info->mount_opt, NODATACOW);
- btrfs_set_opt(info->mount_opt, NODATASUM);
- break;
- case Opt_datacow:
- btrfs_clear_and_info(info, NODATACOW,
- "setting datacow");
- break;
- case Opt_compress_force:
- case Opt_compress_force_type:
- compress_force = true;
- fallthrough;
- case Opt_compress:
- case Opt_compress_type:
- saved_compress_type = btrfs_test_opt(info,
- COMPRESS) ?
- info->compress_type : BTRFS_COMPRESS_NONE;
- saved_compress_force =
- btrfs_test_opt(info, FORCE_COMPRESS);
- saved_compress_level = info->compress_level;
- if (token == Opt_compress ||
- token == Opt_compress_force ||
- strncmp(args[0].from, "zlib", 4) == 0) {
- compress_type = "zlib";
-
- info->compress_type = BTRFS_COMPRESS_ZLIB;
- info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
- /*
- * args[0] contains uninitialized data since
- * for these tokens we don't expect any
- * parameter.
- */
- if (token != Opt_compress &&
- token != Opt_compress_force)
- info->compress_level =
- btrfs_compress_str2level(
- BTRFS_COMPRESS_ZLIB,
- args[0].from + 4);
- btrfs_set_opt(info->mount_opt, COMPRESS);
- btrfs_clear_opt(info->mount_opt, NODATACOW);
- btrfs_clear_opt(info->mount_opt, NODATASUM);
- no_compress = 0;
- } else if (strncmp(args[0].from, "lzo", 3) == 0) {
- compress_type = "lzo";
- info->compress_type = BTRFS_COMPRESS_LZO;
- info->compress_level = 0;
- btrfs_set_opt(info->mount_opt, COMPRESS);
- btrfs_clear_opt(info->mount_opt, NODATACOW);
- btrfs_clear_opt(info->mount_opt, NODATASUM);
- btrfs_set_fs_incompat(info, COMPRESS_LZO);
- no_compress = 0;
- } else if (strncmp(args[0].from, "zstd", 4) == 0) {
- compress_type = "zstd";
- info->compress_type = BTRFS_COMPRESS_ZSTD;
- info->compress_level =
- btrfs_compress_str2level(
- BTRFS_COMPRESS_ZSTD,
- args[0].from + 4);
- btrfs_set_opt(info->mount_opt, COMPRESS);
- btrfs_clear_opt(info->mount_opt, NODATACOW);
- btrfs_clear_opt(info->mount_opt, NODATASUM);
- btrfs_set_fs_incompat(info, COMPRESS_ZSTD);
- no_compress = 0;
- } else if (strncmp(args[0].from, "no", 2) == 0) {
- compress_type = "no";
- info->compress_level = 0;
- info->compress_type = 0;
- btrfs_clear_opt(info->mount_opt, COMPRESS);
- btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
- compress_force = false;
- no_compress++;
- } else {
- btrfs_err(info, "unrecognized compression value %s",
- args[0].from);
- ret = -EINVAL;
- goto out;
- }
-
- if (compress_force) {
- btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
- } else {
- /*
- * If we remount from compress-force=xxx to
- * compress=xxx, we need clear FORCE_COMPRESS
- * flag, otherwise, there is no way for users
- * to disable forcible compression separately.
- */
- btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
- }
- if (no_compress == 1) {
- btrfs_info(info, "use no compression");
- } else if ((info->compress_type != saved_compress_type) ||
- (compress_force != saved_compress_force) ||
- (info->compress_level != saved_compress_level)) {
- btrfs_info(info, "%s %s compression, level %d",
- (compress_force) ? "force" : "use",
- compress_type, info->compress_level);
- }
- compress_force = false;
- break;
- case Opt_ssd:
- btrfs_set_and_info(info, SSD,
- "enabling ssd optimizations");
- btrfs_clear_opt(info->mount_opt, NOSSD);
- break;
- case Opt_ssd_spread:
- btrfs_set_and_info(info, SSD,
- "enabling ssd optimizations");
- btrfs_set_and_info(info, SSD_SPREAD,
- "using spread ssd allocation scheme");
- btrfs_clear_opt(info->mount_opt, NOSSD);
- break;
- case Opt_nossd:
- btrfs_set_opt(info->mount_opt, NOSSD);
- btrfs_clear_and_info(info, SSD,
- "not using ssd optimizations");
- fallthrough;
- case Opt_nossd_spread:
- btrfs_clear_and_info(info, SSD_SPREAD,
- "not using spread ssd allocation scheme");
- break;
- case Opt_barrier:
- btrfs_clear_and_info(info, NOBARRIER,
- "turning on barriers");
- break;
- case Opt_nobarrier:
- btrfs_set_and_info(info, NOBARRIER,
- "turning off barriers");
- break;
- case Opt_thread_pool:
- ret = match_int(&args[0], &intarg);
- if (ret) {
- btrfs_err(info, "unrecognized thread_pool value %s",
- args[0].from);
- goto out;
- } else if (intarg == 0) {
- btrfs_err(info, "invalid value 0 for thread_pool");
- ret = -EINVAL;
- goto out;
- }
- info->thread_pool_size = intarg;
- break;
- case Opt_max_inline:
- num = match_strdup(&args[0]);
- if (num) {
- info->max_inline = memparse(num, NULL);
- kfree(num);
-
- if (info->max_inline) {
- info->max_inline = min_t(u64,
- info->max_inline,
- info->sectorsize);
- }
- btrfs_info(info, "max_inline at %llu",
- info->max_inline);
- } else {
- ret = -ENOMEM;
- goto out;
- }
- break;
- case Opt_acl:
-#ifdef CONFIG_BTRFS_FS_POSIX_ACL
- info->sb->s_flags |= SB_POSIXACL;
- break;
-#else
- btrfs_err(info, "support for ACL not compiled in!");
- ret = -EINVAL;
- goto out;
-#endif
- case Opt_noacl:
- info->sb->s_flags &= ~SB_POSIXACL;
- break;
- case Opt_notreelog:
- btrfs_set_and_info(info, NOTREELOG,
- "disabling tree log");
- break;
- case Opt_treelog:
- btrfs_clear_and_info(info, NOTREELOG,
- "enabling tree log");
- break;
- case Opt_norecovery:
- case Opt_nologreplay:
- btrfs_warn(info,
- "'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
- btrfs_set_and_info(info, NOLOGREPLAY,
- "disabling log replay at mount time");
- break;
- case Opt_flushoncommit:
- btrfs_set_and_info(info, FLUSHONCOMMIT,
- "turning on flush-on-commit");
- break;
- case Opt_noflushoncommit:
- btrfs_clear_and_info(info, FLUSHONCOMMIT,
- "turning off flush-on-commit");
- break;
- case Opt_ratio:
- ret = match_int(&args[0], &intarg);
- if (ret) {
- btrfs_err(info, "unrecognized metadata_ratio value %s",
- args[0].from);
- goto out;
- }
- info->metadata_ratio = intarg;
- btrfs_info(info, "metadata ratio %u",
- info->metadata_ratio);
- break;
- case Opt_discard:
- case Opt_discard_mode:
- if (token == Opt_discard ||
- strcmp(args[0].from, "sync") == 0) {
- btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC);
- btrfs_set_and_info(info, DISCARD_SYNC,
- "turning on sync discard");
- } else if (strcmp(args[0].from, "async") == 0) {
- btrfs_clear_opt(info->mount_opt, DISCARD_SYNC);
- btrfs_set_and_info(info, DISCARD_ASYNC,
- "turning on async discard");
- } else {
- btrfs_err(info, "unrecognized discard mode value %s",
- args[0].from);
- ret = -EINVAL;
- goto out;
- }
- btrfs_clear_opt(info->mount_opt, NODISCARD);
- break;
- case Opt_nodiscard:
- btrfs_clear_and_info(info, DISCARD_SYNC,
- "turning off discard");
- btrfs_clear_and_info(info, DISCARD_ASYNC,
- "turning off async discard");
- btrfs_set_opt(info->mount_opt, NODISCARD);
- break;
- case Opt_space_cache:
- case Opt_space_cache_version:
- /*
- * We already set FREE_SPACE_TREE above because we have
- * compat_ro(FREE_SPACE_TREE) set, and we aren't going
- * to allow v1 to be set for extent tree v2, simply
- * ignore this setting if we're extent tree v2.
- *
- * For subpage blocksize we don't allow space cache v1,
- * and we'll turn on v2, so we can skip the settings
- * here as well.
- */
- if (btrfs_fs_incompat(info, EXTENT_TREE_V2) ||
- info->sectorsize < PAGE_SIZE)
- break;
- if (token == Opt_space_cache ||
- strcmp(args[0].from, "v1") == 0) {
- btrfs_clear_opt(info->mount_opt,
- FREE_SPACE_TREE);
- btrfs_set_and_info(info, SPACE_CACHE,
- "enabling disk space caching");
- } else if (strcmp(args[0].from, "v2") == 0) {
- btrfs_clear_opt(info->mount_opt,
- SPACE_CACHE);
- btrfs_set_and_info(info, FREE_SPACE_TREE,
- "enabling free space tree");
- } else {
- btrfs_err(info, "unrecognized space_cache value %s",
- args[0].from);
- ret = -EINVAL;
- goto out;
- }
- break;
- case Opt_rescan_uuid_tree:
- btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
- break;
- case Opt_no_space_cache:
- /*
- * We cannot operate without the free space tree with
- * extent tree v2, ignore this option.
- */
- if (btrfs_fs_incompat(info, EXTENT_TREE_V2))
- break;
- if (btrfs_test_opt(info, SPACE_CACHE)) {
- btrfs_clear_and_info(info, SPACE_CACHE,
- "disabling disk space caching");
- }
- if (btrfs_test_opt(info, FREE_SPACE_TREE)) {
- btrfs_clear_and_info(info, FREE_SPACE_TREE,
- "disabling free space tree");
- }
- break;
- case Opt_inode_cache:
- case Opt_noinode_cache:
- btrfs_warn(info,
- "the 'inode_cache' option is deprecated and has no effect since 5.11");
- break;
- case Opt_clear_cache:
- /*
- * We cannot clear the free space tree with extent tree
- * v2, ignore this option.
- */
- if (btrfs_fs_incompat(info, EXTENT_TREE_V2))
- break;
- btrfs_set_and_info(info, CLEAR_CACHE,
- "force clearing of disk cache");
- break;
- case Opt_user_subvol_rm_allowed:
- btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
- break;
- case Opt_enospc_debug:
- btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
- break;
- case Opt_noenospc_debug:
- btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
- break;
- case Opt_defrag:
- btrfs_set_and_info(info, AUTO_DEFRAG,
- "enabling auto defrag");
- break;
- case Opt_nodefrag:
- btrfs_clear_and_info(info, AUTO_DEFRAG,
- "disabling auto defrag");
- break;
- case Opt_recovery:
- case Opt_usebackuproot:
- btrfs_warn(info,
- "'%s' is deprecated, use 'rescue=usebackuproot' instead",
- token == Opt_recovery ? "recovery" :
- "usebackuproot");
- btrfs_info(info,
- "trying to use backup root at mount time");
- btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
- break;
- case Opt_skip_balance:
- btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
- break;
- case Opt_fatal_errors:
- if (strcmp(args[0].from, "panic") == 0) {
- btrfs_set_opt(info->mount_opt,
- PANIC_ON_FATAL_ERROR);
- } else if (strcmp(args[0].from, "bug") == 0) {
- btrfs_clear_opt(info->mount_opt,
- PANIC_ON_FATAL_ERROR);
- } else {
- btrfs_err(info, "unrecognized fatal_errors value %s",
- args[0].from);
- ret = -EINVAL;
- goto out;
- }
- break;
- case Opt_commit_interval:
- intarg = 0;
- ret = match_int(&args[0], &intarg);
- if (ret) {
- btrfs_err(info, "unrecognized commit_interval value %s",
- args[0].from);
- ret = -EINVAL;
- goto out;
- }
- if (intarg == 0) {
- btrfs_info(info,
- "using default commit interval %us",
- BTRFS_DEFAULT_COMMIT_INTERVAL);
- intarg = BTRFS_DEFAULT_COMMIT_INTERVAL;
- } else if (intarg > 300) {
- btrfs_warn(info, "excessive commit interval %d",
- intarg);
- }
- info->commit_interval = intarg;
- break;
- case Opt_rescue:
- ret = parse_rescue_options(info, args[0].from);
- if (ret < 0) {
- btrfs_err(info, "unrecognized rescue value %s",
- args[0].from);
- goto out;
- }
- break;
-#ifdef CONFIG_BTRFS_DEBUG
- case Opt_fragment_all:
- btrfs_info(info, "fragmenting all space");
- btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
- btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
- break;
- case Opt_fragment_metadata:
- btrfs_info(info, "fragmenting metadata");
- btrfs_set_opt(info->mount_opt,
- FRAGMENT_METADATA);
- break;
- case Opt_fragment_data:
- btrfs_info(info, "fragmenting data");
- btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
- break;
-#endif
-#ifdef CONFIG_BTRFS_FS_REF_VERIFY
- case Opt_ref_verify:
- btrfs_info(info, "doing ref verification");
- btrfs_set_opt(info->mount_opt, REF_VERIFY);
- break;
-#endif
- case Opt_err:
- btrfs_err(info, "unrecognized mount option '%s'", p);
- ret = -EINVAL;
- goto out;
- default:
- break;
- }
- }
-out:
- if (!ret && !btrfs_check_options(info, &info->mount_opt, new_flags))
- ret = -EINVAL;
- return ret;
-}
-
-/*
- * Parse mount options that are required early in the mount process.
- *
- * All other options will be parsed on much later in the mount process and
- * only when we need to allocate a new super block.
- */
-static int btrfs_parse_device_options(const char *options, blk_mode_t flags)
-{
- substring_t args[MAX_OPT_ARGS];
- char *device_name, *opts, *orig, *p;
- struct btrfs_device *device = NULL;
- int error = 0;
-
- lockdep_assert_held(&uuid_mutex);
-
- if (!options)
- return 0;
-
- /*
- * strsep changes the string, duplicate it because btrfs_parse_options
- * gets called later
- */
- opts = kstrdup(options, GFP_KERNEL);
- if (!opts)
- return -ENOMEM;
- orig = opts;
-
- while ((p = strsep(&opts, ",")) != NULL) {
- int token;
-
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- if (token == Opt_device) {
- device_name = match_strdup(&args[0]);
- if (!device_name) {
- error = -ENOMEM;
- goto out;
- }
- device = btrfs_scan_one_device(device_name, flags, false);
- kfree(device_name);
- if (IS_ERR(device)) {
- error = PTR_ERR(device);
- goto out;
- }
- }
- }
-
-out:
- kfree(orig);
- return error;
-}
-
-/*
- * Parse mount options that are related to subvolume id
- *
- * The value is later passed to mount_subvol()
- */
-static int btrfs_parse_subvol_options(const char *options, char **subvol_name,
- u64 *subvol_objectid)
-{
- substring_t args[MAX_OPT_ARGS];
- char *opts, *orig, *p;
- int error = 0;
- u64 subvolid;
-
- if (!options)
- return 0;
-
- /*
- * strsep changes the string, duplicate it because
- * btrfs_parse_device_options gets called later
- */
- opts = kstrdup(options, GFP_KERNEL);
- if (!opts)
- return -ENOMEM;
- orig = opts;
-
- while ((p = strsep(&opts, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_subvol:
- kfree(*subvol_name);
- *subvol_name = match_strdup(&args[0]);
- if (!*subvol_name) {
- error = -ENOMEM;
- goto out;
- }
- break;
- case Opt_subvolid:
- error = match_u64(&args[0], &subvolid);
- if (error)
- goto out;
-
- /* we want the original fs_tree */
- if (subvolid == 0)
- subvolid = BTRFS_FS_TREE_OBJECTID;
-
- *subvol_objectid = subvolid;
- break;
- default:
- break;
- }
- }
-
-out:
- kfree(orig);
- return error;
-}
-
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
u64 subvol_objectid)
{
return 0;
}
-static int btrfs_test_super(struct super_block *s, void *data)
-{
- struct btrfs_fs_info *p = data;
- struct btrfs_fs_info *fs_info = btrfs_sb(s);
-
- return fs_info->fs_devices == p->fs_devices;
-}
-
-static int btrfs_set_super(struct super_block *s, void *data)
-{
- int err = set_anon_super(s, data);
- if (!err)
- s->s_fs_info = data;
- return err;
-}
-
/*
* subvolumes are identified by ino 256
*/
return root;
}
-/*
- * Find a superblock for the given device / mount point.
- *
- * Note: This is based on mount_bdev from fs/super.c with a few additions
- * for multiple device setup. Make sure to keep it in sync.
- */
-static __maybe_unused struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
- int flags, const char *device_name, void *data)
-{
- struct block_device *bdev = NULL;
- struct super_block *s;
- struct btrfs_device *device = NULL;
- struct btrfs_fs_devices *fs_devices = NULL;
- struct btrfs_fs_info *fs_info = NULL;
- void *new_sec_opts = NULL;
- blk_mode_t mode = sb_open_mode(flags);
- int error = 0;
-
- if (data) {
- error = security_sb_eat_lsm_opts(data, &new_sec_opts);
- if (error)
- return ERR_PTR(error);
- }
-
- /*
- * 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) {
- error = -ENOMEM;
- goto error_sec_opts;
- }
- btrfs_init_fs_info(fs_info);
-
- 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) {
- error = -ENOMEM;
- goto error_fs_info;
- }
-
- mutex_lock(&uuid_mutex);
- error = btrfs_parse_device_options(data, mode);
- if (error) {
- mutex_unlock(&uuid_mutex);
- goto error_fs_info;
- }
-
- /*
- * With 'true' passed to btrfs_scan_one_device() (mount time) we expect
- * either a valid device or an error.
- */
- device = btrfs_scan_one_device(device_name, mode, true);
- ASSERT(device != NULL);
- if (IS_ERR(device)) {
- mutex_unlock(&uuid_mutex);
- error = PTR_ERR(device);
- goto error_fs_info;
- }
-
- fs_devices = device->fs_devices;
- fs_info->fs_devices = fs_devices;
-
- error = btrfs_open_devices(fs_devices, mode, fs_type);
- mutex_unlock(&uuid_mutex);
- if (error)
- goto error_fs_info;
-
- if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
- error = -EACCES;
- goto error_close_devices;
- }
-
- bdev = fs_devices->latest_dev->bdev;
- s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
- fs_info);
- if (IS_ERR(s)) {
- error = PTR_ERR(s);
- goto error_close_devices;
- }
-
- if (s->s_root) {
- btrfs_close_devices(fs_devices);
- btrfs_free_fs_info(fs_info);
- if ((flags ^ s->s_flags) & SB_RDONLY)
- error = -EBUSY;
- } else {
- snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
- shrinker_debugfs_rename(s->s_shrink, "sb-%s:%s", fs_type->name,
- s->s_id);
- btrfs_sb(s)->bdev_holder = fs_type;
- error = btrfs_fill_super(s, fs_devices, data);
- }
- if (!error)
- error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
- security_free_mnt_opts(&new_sec_opts);
- if (error) {
- deactivate_locked_super(s);
- return ERR_PTR(error);
- }
-
- return dget(s->s_root);
-
-error_close_devices:
- btrfs_close_devices(fs_devices);
-error_fs_info:
- btrfs_free_fs_info(fs_info);
-error_sec_opts:
- security_free_mnt_opts(&new_sec_opts);
- return ERR_PTR(error);
-}
-
-/*
- * Mount function which is called by VFS layer.
- *
- * In order to allow mounting a subvolume directly, btrfs uses mount_subtree()
- * which needs vfsmount* of device's root (/). This means device's root has to
- * be mounted internally in any case.
- *
- * Operation flow:
- * 1. Parse subvol id related options for later use in mount_subvol().
- *
- * 2. Mount device's root (/) by calling vfs_kern_mount().
- *
- * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the
- * first place. In order to avoid calling btrfs_mount() again, we use
- * different file_system_type which is not registered to VFS by
- * register_filesystem() (btrfs_root_fs_type). As a result,
- * btrfs_mount_root() is called. The return value will be used by
- * mount_subtree() in mount_subvol().
- *
- * 3. Call mount_subvol() to get the dentry of subvolume. Since there is
- * "btrfs subvolume set-default", mount_subvol() is called always.
- */
-static __maybe_unused struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
- const char *device_name, void *data)
-{
- struct vfsmount *mnt_root;
- struct dentry *root;
- char *subvol_name = NULL;
- u64 subvol_objectid = 0;
- int error = 0;
-
- error = btrfs_parse_subvol_options(data, &subvol_name,
- &subvol_objectid);
- if (error) {
- kfree(subvol_name);
- return ERR_PTR(error);
- }
-
- /* mount device's root (/) */
- mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data);
- if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) {
- if (flags & SB_RDONLY) {
- mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
- flags & ~SB_RDONLY, device_name, data);
- } else {
- mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
- flags | SB_RDONLY, device_name, data);
- if (IS_ERR(mnt_root)) {
- root = ERR_CAST(mnt_root);
- kfree(subvol_name);
- goto out;
- }
-
- down_write(&mnt_root->mnt_sb->s_umount);
- error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL);
- up_write(&mnt_root->mnt_sb->s_umount);
- if (error < 0) {
- root = ERR_PTR(error);
- mntput(mnt_root);
- kfree(subvol_name);
- goto out;
- }
- }
- }
- if (IS_ERR(mnt_root)) {
- root = ERR_CAST(mnt_root);
- kfree(subvol_name);
- goto out;
- }
-
- /* mount_subvol() will free subvol_name and mnt_root */
- root = mount_subvol(subvol_name, subvol_objectid, mnt_root);
-
-out:
- return root;
-}
-
static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
u32 new_pool_size, u32 old_pool_size)
{
return btrfs_commit_super(fs_info);
}
-static int btrfs_remount(struct super_block *sb, int *flags, char *data)
-{
- struct btrfs_fs_info *fs_info = btrfs_sb(sb);
- unsigned old_flags = sb->s_flags;
- unsigned long old_opts = fs_info->mount_opt;
- unsigned long old_compress_type = fs_info->compress_type;
- u64 old_max_inline = fs_info->max_inline;
- u32 old_thread_pool_size = fs_info->thread_pool_size;
- u32 old_metadata_ratio = fs_info->metadata_ratio;
- int ret;
-
- sync_filesystem(sb);
- set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
-
- if (data) {
- void *new_sec_opts = NULL;
-
- ret = security_sb_eat_lsm_opts(data, &new_sec_opts);
- if (!ret)
- ret = security_sb_remount(sb, new_sec_opts);
- security_free_mnt_opts(&new_sec_opts);
- if (ret)
- goto restore;
- }
-
- ret = btrfs_parse_options(fs_info, data, *flags);
- if (ret)
- goto restore;
-
- ret = btrfs_check_features(fs_info, !(*flags & SB_RDONLY));
- if (ret < 0)
- goto restore;
-
- btrfs_remount_begin(fs_info, old_opts, *flags);
- btrfs_resize_thread_pool(fs_info,
- fs_info->thread_pool_size, old_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) || (*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) && (*flags & SB_RDONLY))
- ret = btrfs_remount_ro(fs_info);
- else if (sb_rdonly(sb) && !(*flags & SB_RDONLY))
- ret = btrfs_remount_rw(fs_info);
- if (ret)
- goto restore;
-
- /*
- * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS,
- * since the absence of the flag means it can be toggled off by remount.
- */
- *flags |= SB_I_VERSION;
-
- wake_up_process(fs_info->transaction_kthread);
- btrfs_remount_cleanup(fs_info, old_opts);
- btrfs_clear_oneshot_options(fs_info);
- clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
-
- return 0;
-
-restore:
- /* We've hit an error - don't reset SB_RDONLY */
- if (sb_rdonly(sb))
- old_flags |= SB_RDONLY;
- if (!(old_flags & SB_RDONLY))
- clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
- sb->s_flags = old_flags;
- fs_info->mount_opt = old_opts;
- fs_info->compress_type = old_compress_type;
- fs_info->max_inline = old_max_inline;
- btrfs_resize_thread_pool(fs_info,
- old_thread_pool_size, fs_info->thread_pool_size);
- fs_info->metadata_ratio = old_metadata_ratio;
- btrfs_remount_cleanup(fs_info, old_opts);
- clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
-
- return ret;
-}
-
static void btrfs_ctx_to_info(struct btrfs_fs_info *fs_info, struct btrfs_fs_context *ctx)
{
fs_info->max_inline = ctx->max_inline;
projects / linux.git / commitdiff