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- // 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/cleancache.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 "tests/btrfs-tests.h"
- #include "block-group.h"
- #include "discard.h"
- #include "qgroup.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);
- /*
- * 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
- 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);
- 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) in %s:%d: errno=%d %s (%pV)\n",
- sb->s_id, function, line, errno, errstr, &vaf);
- va_end(args);
- } else {
- pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
- sb->s_id, 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 */
- sb->s_flags |= SB_RDONLY;
- 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))
- printk("%sBTRFS %s (device %s): %pV\n", lvl, type,
- fs_info ? fs_info->sb->s_id : "<unknown>", &vaf);
- va_end(args);
- }
- #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)
- {
- struct btrfs_fs_info *fs_info = trans->fs_info;
- WRITE_ONCE(trans->aborted, errno);
- /* Nothing used. The other threads that have joined this
- * transaction may be able to continue. */
- if (!trans->dirty && list_empty(&trans->new_bgs)) {
- const char *errstr;
- errstr = btrfs_decode_error(errno);
- btrfs_warn(fs_info,
- "%s:%d: Aborting unused transaction(%s).",
- function, line, errstr);
- return;
- }
- WRITE_ONCE(trans->transaction->aborted, errno);
- /* 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_inode_cache, Opt_noinode_cache,
- 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,
- /* Deprecated options */
- Opt_recovery,
- /* 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_err, NULL},
- };
- 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_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;
- u64 cache_gen;
- 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;
- cache_gen = btrfs_super_cache_generation(info->super_copy);
- if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
- btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
- else if (cache_gen)
- 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 {
- 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) {
- goto out;
- } else if (intarg == 0) {
- 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)
- 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 {
- 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:
- 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 {
- 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:
- 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:
- btrfs_warn(info,
- "the 'inode_cache' option is deprecated and will have no effect from 5.11");
- btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
- "enabling inode map caching");
- break;
- case Opt_noinode_cache:
- btrfs_clear_pending_and_info(info, INODE_MAP_CACHE,
- "disabling inode map caching");
- break;
- case Opt_clear_cache:
- 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_INCLUDING_EXTENT_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)
- 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 {
- ret = -EINVAL;
- goto out;
- }
- break;
- case Opt_commit_interval:
- intarg = 0;
- ret = match_int(&args[0], &intarg);
- if (ret)
- 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)
- 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:
- /*
- * Extra check for current option against current flag
- */
- if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) {
- btrfs_err(info,
- "nologreplay must be used with ro mount option");
- 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 && btrfs_test_opt(info, SPACE_CACHE))
- btrfs_info(info, "disk space caching is enabled");
- if (!ret && 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;
- }
- path->leave_spinning = 1;
- 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_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0) {
- goto err;
- } else if (ret > 0) {
- ret = btrfs_previous_item(root, path, subvol_objectid,
- BTRFS_ROOT_BACKREF_KEY);
- if (ret < 0) {
- goto err;
- } else if (ret > 0) {
- ret = -ENOENT;
- goto err;
- }
- }
- btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
- 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_slot(NULL, fs_root, &key, path, 0, 0);
- if (ret < 0) {
- goto err;
- } else if (ret > 0) {
- ret = btrfs_previous_item(fs_root, path, dirid,
- BTRFS_INODE_REF_KEY);
- if (ret < 0) {
- goto err;
- } else if (ret > 0) {
- ret = -ENOENT;
- goto err;
- }
- }
- btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
- 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;
- path->leave_spinning = 1;
- /*
- * 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;
- 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;
- }
- cleancache_init_fs(sb);
- 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 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;
- 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))
- seq_puts(seq, ",rescue=nologreplay");
- 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_test_opt(info, SPACE_CACHE))
- seq_puts(seq, ",space_cache");
- else if (btrfs_test_opt(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, INODE_MAP_CACHE))
- seq_puts(seq, ",inode_cache");
- 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_INCLUDING_EXTENT_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_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);
- 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->delalloc_workers, new_pool_size);
- btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
- btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
- btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
- btrfs_workqueue_set_max(fs_info->endio_meta_write_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);
- btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
- btrfs_workqueue_set_max(fs_info->scrub_wr_completion_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)
- {
- /*
- * 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);
- }
- static int btrfs_remount(struct super_block *sb, int *flags, char *data)
- {
- struct btrfs_fs_info *fs_info = btrfs_sb(sb);
- struct btrfs_root *root = fs_info->tree_root;
- 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;
- 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)(*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);
- sb->s_flags |= SB_RDONLY;
- /*
- * 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);
- 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 (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
- 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;
- }
- ret = btrfs_cleanup_fs_roots(fs_info);
- if (ret)
- goto restore;
- /* recover relocation */
- mutex_lock(&fs_info->cleaner_mutex);
- ret = btrfs_recover_relocation(root);
- mutex_unlock(&fs_info->cleaner_mutex);
- if (ret)
- goto restore;
- ret = btrfs_resume_balance_async(fs_info);
- if (ret)
- goto restore;
- ret = btrfs_resume_dev_replace_async(fs_info);
- if (ret) {
- btrfs_warn(fs_info, "failed to resume dev_replace");
- goto restore;
- }
- btrfs_qgroup_rescan_resume(fs_info);
- if (!fs_info->uuid_root) {
- btrfs_info(fs_info, "creating UUID tree");
- ret = btrfs_create_uuid_tree(fs_info);
- if (ret) {
- btrfs_warn(fs_info,
- "failed to create the UUID tree %d",
- ret);
- goto restore;
- }
- }
- sb->s_flags &= ~SB_RDONLY;
- 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);
- 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;
- 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 inline int btrfs_cmp_device_free_bytes(const void *dev_info1,
- const void *dev_info2)
- {
- if (((struct btrfs_device_info *)dev_info1)->max_avail >
- ((struct btrfs_device_info *)dev_info2)->max_avail)
- return -1;
- else if (((struct btrfs_device_info *)dev_info1)->max_avail <
- ((struct btrfs_device_info *)dev_info2)->max_avail)
- return 1;
- else
- 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)
- num_stripes = 2;
- else if (type & BTRFS_BLOCK_GROUP_RAID1C3)
- num_stripes = 3;
- else if (type & BTRFS_BLOCK_GROUP_RAID1C4)
- num_stripes = 4;
- 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);
- /*
- * In order to avoid overwriting the superblock on the drive,
- * btrfs starts at an offset of at least 1MB when doing chunk
- * allocation.
- *
- * This ensures we have at least min_stripe_size free space
- * after excluding 1MB.
- */
- if (avail_space <= SZ_1M + min_stripe_size)
- continue;
- avail_space -= SZ_1M;
- 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;
- int bits = dentry->d_sb->s_blocksize_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,
- };
- 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;
- 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:
- ret = btrfs_forget_devices(vol->name);
- 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 btrfs_unfreeze(struct super_block *sb)
- {
- struct btrfs_fs_info *fs_info = btrfs_sb(sb);
- clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
- 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);
- struct btrfs_device *dev, *first_dev = NULL;
- /*
- * Lightweight locking of the devices. We should not need
- * device_list_mutex here as we only read the device data and the list
- * is protected by RCU. Even if a device is deleted during the list
- * traversals, we'll get valid data, the freeing callback will wait at
- * least until the rcu_read_unlock.
- */
- rcu_read_lock();
- list_for_each_entry_rcu(dev, &fs_info->fs_devices->devices, dev_list) {
- if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
- continue;
- if (!dev->name)
- continue;
- if (!first_dev || dev->devid < first_dev->devid)
- first_dev = dev;
- }
- if (first_dev)
- seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
- else
- WARN_ON(1);
- 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
- ;
- 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_io_init();
- if (err)
- goto free_cachep;
- err = extent_state_cache_init();
- if (err)
- goto free_extent_io;
- err = extent_map_init();
- if (err)
- goto free_extent_state_cache;
- 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_end_io_wq_init();
- if (err)
- goto free_prelim_ref;
- err = btrfs_interface_init();
- if (err)
- goto free_end_io_wq;
- btrfs_init_lockdep();
- 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_end_io_wq:
- btrfs_end_io_wq_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_extent_state_cache:
- extent_state_cache_exit();
- free_extent_io:
- extent_io_exit();
- 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();
- extent_state_cache_exit();
- extent_io_exit();
- btrfs_interface_exit();
- btrfs_end_io_wq_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_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
- MODULE_SOFTDEP("pre: crc32c");
- MODULE_SOFTDEP("pre: xxhash64");
- MODULE_SOFTDEP("pre: sha256");
- MODULE_SOFTDEP("pre: blake2b-256");
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