| // 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 "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 "volumes.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" |
| #define CREATE_TRACE_POINTS |
| #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); |
| |
| #ifdef CONFIG_PRINTK |
| |
| #define STATE_STRING_PREFACE ": state " |
| #define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT) |
| |
| /* |
| * Characters to print to indicate error conditions or uncommon filesystem state. |
| * RO is not an error. |
| */ |
| static const char fs_state_chars[] = { |
| [BTRFS_FS_STATE_ERROR] = 'E', |
| [BTRFS_FS_STATE_REMOUNTING] = 'M', |
| [BTRFS_FS_STATE_RO] = 0, |
| [BTRFS_FS_STATE_TRANS_ABORTED] = 'A', |
| [BTRFS_FS_STATE_DEV_REPLACING] = 'R', |
| [BTRFS_FS_STATE_DUMMY_FS_INFO] = 0, |
| [BTRFS_FS_STATE_NO_CSUMS] = 'C', |
| [BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L', |
| }; |
| |
| static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf) |
| { |
| unsigned int bit; |
| bool states_printed = false; |
| unsigned long fs_state = READ_ONCE(info->fs_state); |
| char *curr = buf; |
| |
| memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE)); |
| curr += sizeof(STATE_STRING_PREFACE) - 1; |
| |
| for_each_set_bit(bit, &fs_state, sizeof(fs_state)) { |
| WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT); |
| if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) { |
| *curr++ = fs_state_chars[bit]; |
| states_printed = true; |
| } |
| } |
| |
| /* If no states were printed, reset the buffer */ |
| if (!states_printed) |
| curr = buf; |
| |
| *curr++ = 0; |
| } |
| #endif |
| |
| /* |
| * Generally the error codes correspond to their respective errors, but there |
| * are a few special cases. |
| * |
| * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for |
| * instance will return EUCLEAN if any of the blocks are corrupted in |
| * a way that is problematic. We want to reserve EUCLEAN for these |
| * sort of corruptions. |
| * |
| * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we |
| * need to use EROFS for this case. We will have no idea of the |
| * original failure, that will have been reported at the time we tripped |
| * over the error. Each subsequent error that doesn't have any context |
| * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR. |
| */ |
| const char * __attribute_const__ btrfs_decode_error(int errno) |
| { |
| char *errstr = "unknown"; |
| |
| switch (errno) { |
| case -ENOENT: /* -2 */ |
| errstr = "No such entry"; |
| break; |
| case -EIO: /* -5 */ |
| errstr = "IO failure"; |
| break; |
| case -ENOMEM: /* -12*/ |
| errstr = "Out of memory"; |
| break; |
| case -EEXIST: /* -17 */ |
| errstr = "Object already exists"; |
| break; |
| case -ENOSPC: /* -28 */ |
| errstr = "No space left"; |
| break; |
| case -EROFS: /* -30 */ |
| errstr = "Readonly filesystem"; |
| break; |
| case -EOPNOTSUPP: /* -95 */ |
| errstr = "Operation not supported"; |
| break; |
| case -EUCLEAN: /* -117 */ |
| errstr = "Filesystem corrupted"; |
| break; |
| case -EDQUOT: /* -122 */ |
| errstr = "Quota exceeded"; |
| break; |
| } |
| |
| return errstr; |
| } |
| |
| /* |
| * __btrfs_handle_fs_error decodes expected errors from the caller and |
| * invokes the appropriate error response. |
| */ |
| __cold |
| void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, |
| unsigned int line, int errno, const char *fmt, ...) |
| { |
| struct super_block *sb = fs_info->sb; |
| #ifdef CONFIG_PRINTK |
| char statestr[STATE_STRING_BUF_LEN]; |
| const char *errstr; |
| #endif |
| |
| /* |
| * Special case: if the error is EROFS, and we're already |
| * under SB_RDONLY, then it is safe here. |
| */ |
| if (errno == -EROFS && sb_rdonly(sb)) |
| return; |
| |
| #ifdef CONFIG_PRINTK |
| errstr = btrfs_decode_error(errno); |
| btrfs_state_to_string(fs_info, statestr); |
| if (fmt) { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| |
| pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n", |
| sb->s_id, statestr, function, line, errno, errstr, &vaf); |
| va_end(args); |
| } else { |
| pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n", |
| sb->s_id, statestr, function, line, errno, errstr); |
| } |
| #endif |
| |
| /* |
| * Today we only save the error info to memory. Long term we'll |
| * also send it down to the disk |
| */ |
| set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
| |
| /* Don't go through full error handling during mount */ |
| if (!(sb->s_flags & SB_BORN)) |
| return; |
| |
| if (sb_rdonly(sb)) |
| return; |
| |
| btrfs_discard_stop(fs_info); |
| |
| /* btrfs handle error by forcing the filesystem readonly */ |
| btrfs_set_sb_rdonly(sb); |
| btrfs_info(fs_info, "forced readonly"); |
| /* |
| * Note that a running device replace operation is not canceled here |
| * although there is no way to update the progress. It would add the |
| * risk of a deadlock, therefore the canceling is omitted. The only |
| * penalty is that some I/O remains active until the procedure |
| * completes. The next time when the filesystem is mounted writable |
| * again, the device replace operation continues. |
| */ |
| } |
| |
| #ifdef CONFIG_PRINTK |
| static const char * const logtypes[] = { |
| "emergency", |
| "alert", |
| "critical", |
| "error", |
| "warning", |
| "notice", |
| "info", |
| "debug", |
| }; |
| |
| |
| /* |
| * Use one ratelimit state per log level so that a flood of less important |
| * messages doesn't cause more important ones to be dropped. |
| */ |
| static struct ratelimit_state printk_limits[] = { |
| RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), |
| RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), |
| }; |
| |
| void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
| { |
| char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; |
| struct va_format vaf; |
| va_list args; |
| int kern_level; |
| const char *type = logtypes[4]; |
| struct ratelimit_state *ratelimit = &printk_limits[4]; |
| |
| va_start(args, fmt); |
| |
| while ((kern_level = printk_get_level(fmt)) != 0) { |
| size_t size = printk_skip_level(fmt) - fmt; |
| |
| if (kern_level >= '0' && kern_level <= '7') { |
| memcpy(lvl, fmt, size); |
| lvl[size] = '\0'; |
| type = logtypes[kern_level - '0']; |
| ratelimit = &printk_limits[kern_level - '0']; |
| } |
| fmt += size; |
| } |
| |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| |
| if (__ratelimit(ratelimit)) { |
| if (fs_info) { |
| char statestr[STATE_STRING_BUF_LEN]; |
| |
| btrfs_state_to_string(fs_info, statestr); |
| _printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type, |
| fs_info->sb->s_id, statestr, &vaf); |
| } else { |
| _printk("%sBTRFS %s: %pV\n", lvl, type, &vaf); |
| } |
| } |
| |
| va_end(args); |
| } |
| #endif |
| |
| #if BITS_PER_LONG == 32 |
| void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info) |
| { |
| if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) { |
| btrfs_warn(fs_info, "reaching 32bit limit for logical addresses"); |
| btrfs_warn(fs_info, |
| "due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT", |
| BTRFS_32BIT_MAX_FILE_SIZE >> 40); |
| btrfs_warn(fs_info, |
| "please consider upgrading to 64bit kernel/hardware"); |
| } |
| } |
| |
| void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info) |
| { |
| if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) { |
| btrfs_err(fs_info, "reached 32bit limit for logical addresses"); |
| btrfs_err(fs_info, |
| "due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed", |
| BTRFS_32BIT_MAX_FILE_SIZE >> 40); |
| btrfs_err(fs_info, |
| "please consider upgrading to 64bit kernel/hardware"); |
| } |
| } |
| #endif |
| |
| /* |
| * We only mark the transaction aborted and then set the file system read-only. |
| * This will prevent new transactions from starting or trying to join this |
| * one. |
| * |
| * This means that error recovery at the call site is limited to freeing |
| * any local memory allocations and passing the error code up without |
| * further cleanup. The transaction should complete as it normally would |
| * in the call path but will return -EIO. |
| * |
| * We'll complete the cleanup in btrfs_end_transaction and |
| * btrfs_commit_transaction. |
| */ |
| __cold |
| void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
| const char *function, |
| unsigned int line, int errno, bool first_hit) |
| { |
| struct btrfs_fs_info *fs_info = trans->fs_info; |
| |
| WRITE_ONCE(trans->aborted, errno); |
| WRITE_ONCE(trans->transaction->aborted, errno); |
| if (first_hit && errno == -ENOSPC) |
| btrfs_dump_space_info_for_trans_abort(fs_info); |
| /* Wake up anybody who may be waiting on this transaction */ |
| wake_up(&fs_info->transaction_wait); |
| wake_up(&fs_info->transaction_blocked_wait); |
| __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); |
| } |
| /* |
| * __btrfs_panic decodes unexpected, fatal errors from the caller, |
| * issues an alert, and either panics or BUGs, depending on mount options. |
| */ |
| __cold |
| void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
| unsigned int line, int errno, const char *fmt, ...) |
| { |
| char *s_id = "<unknown>"; |
| const char *errstr; |
| struct va_format vaf = { .fmt = fmt }; |
| va_list args; |
| |
| if (fs_info) |
| s_id = fs_info->sb->s_id; |
| |
| va_start(args, fmt); |
| vaf.va = &args; |
| |
| errstr = btrfs_decode_error(errno); |
| if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) |
| panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
| s_id, function, line, &vaf, errno, errstr); |
| |
| btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
| function, line, &vaf, errno, errstr); |
| va_end(args); |
| /* Caller calls BUG() */ |
| } |
| |
| static void btrfs_put_super(struct super_block *sb) |
| { |
| close_ctree(btrfs_sb(sb)); |
| } |
| |
| enum { |
| Opt_acl, Opt_noacl, |
| 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_noflushoncommit, |
| Opt_max_inline, |
| Opt_barrier, Opt_nobarrier, |
| Opt_datacow, Opt_nodatacow, |
| Opt_datasum, Opt_nodatasum, |
| Opt_defrag, Opt_nodefrag, |
| Opt_discard, Opt_nodiscard, |
| Opt_discard_mode, |
| Opt_norecovery, |
| Opt_ratio, |
| Opt_rescan_uuid_tree, |
| Opt_skip_balance, |
| Opt_space_cache, Opt_no_space_cache, |
| Opt_space_cache_version, |
| Opt_ssd, Opt_nossd, |
| Opt_ssd_spread, Opt_nossd_spread, |
| Opt_subvol, |
| Opt_subvol_empty, |
| Opt_subvolid, |
| Opt_thread_pool, |
| Opt_treelog, Opt_notreelog, |
| Opt_user_subvol_rm_allowed, |
| |
| /* Rescue options */ |
| Opt_rescue, |
| Opt_usebackuproot, |
| Opt_nologreplay, |
| Opt_ignorebadroots, |
| Opt_ignoredatacsums, |
| Opt_rescue_all, |
| |
| /* Deprecated options */ |
| Opt_recovery, |
| Opt_inode_cache, Opt_noinode_cache, |
| |
| /* Debugging options */ |
| Opt_check_integrity, |
| Opt_check_integrity_including_extent_data, |
| Opt_check_integrity_print_mask, |
| Opt_enospc_debug, Opt_noenospc_debug, |
| #ifdef CONFIG_BTRFS_DEBUG |
| Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, |
| #endif |
| #ifdef CONFIG_BTRFS_FS_REF_VERIFY |
| Opt_ref_verify, |
| #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_check_integrity, "check_int"}, |
| {Opt_check_integrity_including_extent_data, "check_int_data"}, |
| {Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, |
| {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}, |
| }; |
| |
| static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt, |
| const char *opt_name) |
| { |
| if (fs_info->mount_opt & opt) { |
| btrfs_err(fs_info, "%s must be used with ro mount option", |
| opt_name); |
| return true; |
| } |
| return false; |
| } |
| |
| 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; |
| const bool remounting = test_bit(BTRFS_FS_STATE_REMOUNTING, &info->fs_state); |
| |
| if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
| btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); |
| else if (btrfs_free_space_cache_v1_active(info)) { |
| if (btrfs_is_zoned(info)) { |
| btrfs_info(info, |
| "zoned: clearing existing space cache"); |
| btrfs_set_super_cache_generation(info->super_copy, 0); |
| } else { |
| btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
| } |
| } |
| |
| /* |
| * Even the options are empty, we still need to do extra check |
| * against new flags |
| */ |
| if (!options) |
| goto check; |
| |
| 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; |
| } |
| 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"); |
| 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. |
| */ |
| if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) |
| 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; |
| #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| case Opt_check_integrity_including_extent_data: |
| btrfs_info(info, |
| "enabling check integrity including extent data"); |
| btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY_DATA); |
| btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| break; |
| case Opt_check_integrity: |
| btrfs_info(info, "enabling check integrity"); |
| btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| break; |
| case Opt_check_integrity_print_mask: |
| ret = match_int(&args[0], &intarg); |
| if (ret) { |
| btrfs_err(info, |
| "unrecognized check_integrity_print_mask value %s", |
| args[0].from); |
| goto out; |
| } |
| info->check_integrity_print_mask = intarg; |
| btrfs_info(info, "check_integrity_print_mask 0x%x", |
| info->check_integrity_print_mask); |
| break; |
| #else |
| case Opt_check_integrity_including_extent_data: |
| case Opt_check_integrity: |
| case Opt_check_integrity_print_mask: |
| btrfs_err(info, |
| "support for check_integrity* not compiled in!"); |
| ret = -EINVAL; |
| goto out; |
| #endif |
| 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; |
| } |
| } |
| check: |
| /* We're read-only, don't have to check. */ |
| if (new_flags & SB_RDONLY) |
| goto out; |
| |
| if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || |
| check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || |
| check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) |
| ret = -EINVAL; |
| out: |
| if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && |
| !btrfs_test_opt(info, FREE_SPACE_TREE) && |
| !btrfs_test_opt(info, CLEAR_CACHE)) { |
| btrfs_err(info, "cannot disable free space tree"); |
| ret = -EINVAL; |
| |
| } |
| if (!ret) |
| ret = btrfs_check_mountopts_zoned(info); |
| if (!ret && !remounting) { |
| if (btrfs_test_opt(info, SPACE_CACHE)) |
| btrfs_info(info, "disk space caching is enabled"); |
| if (btrfs_test_opt(info, FREE_SPACE_TREE)) |
| btrfs_info(info, "using free space tree"); |
| } |
| 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, fmode_t flags, |
| void *holder) |
| { |
| 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, |
| holder); |
| 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) |
| { |
| 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; |
| 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, "default", 7, 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; |
| #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
| sb->s_flags |= SB_POSIXACL; |
| #endif |
| sb->s_flags |= SB_I_VERSION; |
| 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); |
| 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 (fs_info->pending_changes == 0) |
| 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"); |
| #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| if (btrfs_test_opt(info, CHECK_INTEGRITY_DATA)) |
| seq_puts(seq, ",check_int_data"); |
| else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
| seq_puts(seq, ",check_int"); |
| if (info->check_integrity_print_mask) |
| seq_printf(seq, ",check_int_print_mask=%d", |
| info->check_integrity_print_mask); |
| #endif |
| 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; |
| } |
| |
| 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 |
| */ |
| 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; |
| } |
| |
| /* |
| * 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 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; |
| fmode_t mode = FMODE_READ; |
| int error = 0; |
| |
| if (!(flags & SB_RDONLY)) |
| mode |= FMODE_WRITE; |
| |
| 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, fs_type); |
| if (error) { |
| mutex_unlock(&uuid_mutex); |
| goto error_fs_info; |
| } |
| |
| device = btrfs_scan_one_device(device_name, mode, fs_type); |
| 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; |
| if (!strstr(crc32c_impl(), "generic")) |
| set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); |
| 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 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) |
| { |
| 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->hipri_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); |
| 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(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, sb); |
| 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); |
| } |
| } |
| |
| if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
| goto out; |
| |
| if (*flags & SB_RDONLY) { |
| /* |
| * 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(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); |
| |
| ret = btrfs_commit_super(fs_info); |
| if (ret) |
| goto restore; |
| } else { |
| if (BTRFS_FS_ERROR(fs_info)) { |
| btrfs_err(fs_info, |
| "Remounting read-write after error is not allowed"); |
| ret = -EINVAL; |
| goto restore; |
| } |
| if (fs_info->fs_devices->rw_devices == 0) { |
| ret = -EACCES; |
| goto restore; |
| } |
| |
| if (!btrfs_check_rw_degradable(fs_info, NULL)) { |
| btrfs_warn(fs_info, |
| "too many missing devices, writable remount is not allowed"); |
| ret = -EACCES; |
| goto restore; |
| } |
| |
| if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
| btrfs_warn(fs_info, |
| "mount required to replay tree-log, cannot remount read-write"); |
| ret = -EINVAL; |
| goto restore; |
| } |
| |
| /* |
| * 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) |
| goto restore; |
| |
| btrfs_clear_sb_rdonly(sb); |
| |
| set_bit(BTRFS_FS_OPEN, &fs_info->flags); |
| } |
| out: |
| /* |
| * 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; |
| } |
| |
| /* 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 goup 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 < 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 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 struct file_system_type btrfs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "btrfs", |
| .mount = btrfs_mount, |
| .kill_sb = btrfs_kill_super, |
| .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
| }; |
| |
| static struct file_system_type btrfs_root_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "btrfs", |
| .mount = btrfs_mount_root, |
| .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); |
| device = btrfs_scan_one_device(vol->name, FMODE_READ, |
| &btrfs_root_fs_type); |
| 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); |
| device = btrfs_scan_one_device(vol->name, FMODE_READ, |
| &btrfs_root_fs_type); |
| if (IS_ERR(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; |
| 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; |
| |
| if (btrfs_super_generation(sb) != fs_info->last_trans_committed) { |
| btrfs_err(fs_info, "transid mismatch, has %llu expect %llu", |
| btrfs_super_generation(sb), |
| fs_info->last_trans_committed); |
| 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, rcu_str_deref(fs_info->fs_devices->latest_dev->name), " \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, |
| .remount_fs = btrfs_remount, |
| .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 void __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_CHECK_INTEGRITY |
| ", integrity-checker=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, crc32c=%s%s\n", crc32c_impl(), options); |
| } |
| |
| static int __init init_btrfs_fs(void) |
| { |
| int err; |
| |
| btrfs_props_init(); |
| |
| err = btrfs_init_sysfs(); |
| if (err) |
| return err; |
| |
| btrfs_init_compress(); |
| |
| err = btrfs_init_cachep(); |
| if (err) |
| goto free_compress; |
| |
| err = extent_state_init_cachep(); |
| if (err) |
| goto free_cachep; |
| |
| err = extent_buffer_init_cachep(); |
| if (err) |
| goto free_extent_cachep; |
| |
| err = btrfs_bioset_init(); |
| if (err) |
| goto free_eb_cachep; |
| |
| err = extent_map_init(); |
| if (err) |
| goto free_bioset; |
| |
| err = ordered_data_init(); |
| if (err) |
| goto free_extent_map; |
| |
| err = btrfs_delayed_inode_init(); |
| if (err) |
| goto free_ordered_data; |
| |
| err = btrfs_auto_defrag_init(); |
| if (err) |
| goto free_delayed_inode; |
| |
| err = btrfs_delayed_ref_init(); |
| if (err) |
| goto free_auto_defrag; |
| |
| err = btrfs_prelim_ref_init(); |
| if (err) |
| goto free_delayed_ref; |
| |
| err = btrfs_interface_init(); |
| if (err) |
| goto free_prelim_ref; |
| |
| btrfs_print_mod_info(); |
| |
| err = btrfs_run_sanity_tests(); |
| if (err) |
| goto unregister_ioctl; |
| |
| err = register_filesystem(&btrfs_fs_type); |
| if (err) |
| goto unregister_ioctl; |
| |
| return 0; |
| |
| unregister_ioctl: |
| btrfs_interface_exit(); |
| free_prelim_ref: |
| btrfs_prelim_ref_exit(); |
| free_delayed_ref: |
| btrfs_delayed_ref_exit(); |
| free_auto_defrag: |
| btrfs_auto_defrag_exit(); |
| free_delayed_inode: |
| btrfs_delayed_inode_exit(); |
| free_ordered_data: |
| ordered_data_exit(); |
| free_extent_map: |
| extent_map_exit(); |
| free_bioset: |
| btrfs_bioset_exit(); |
| free_eb_cachep: |
| extent_buffer_free_cachep(); |
| free_extent_cachep: |
| extent_state_free_cachep(); |
| free_cachep: |
| btrfs_destroy_cachep(); |
| free_compress: |
| btrfs_exit_compress(); |
| btrfs_exit_sysfs(); |
| |
| return err; |
| } |
| |
| static void __exit exit_btrfs_fs(void) |
| { |
| btrfs_destroy_cachep(); |
| btrfs_delayed_ref_exit(); |
| btrfs_auto_defrag_exit(); |
| btrfs_delayed_inode_exit(); |
| btrfs_prelim_ref_exit(); |
| ordered_data_exit(); |
| extent_map_exit(); |
| btrfs_bioset_exit(); |
| extent_state_free_cachep(); |
| extent_buffer_free_cachep(); |
| btrfs_interface_exit(); |
| unregister_filesystem(&btrfs_fs_type); |
| btrfs_exit_sysfs(); |
| btrfs_cleanup_fs_uuids(); |
| btrfs_exit_compress(); |
| } |
| |
| 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"); |
