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super.c
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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 "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);
const char *btrfs_decode_error(int errno)
{
char *errstr = "unknown";
switch (errno) {
case -EIO:
errstr = "IO failure";
break;
case -ENOMEM:
errstr = "Out of memory";
break;
case -EROFS:
errstr = "Readonly filesystem";
break;
case -EEXIST:
errstr = "Object already exists";
break;
case -ENOSPC:
errstr = "No space left";
break;
case -ENOENT:
errstr = "No such entry";
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 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 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;
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_nologreplay,
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_usebackuproot,
Opt_user_subvol_rm_allowed,
/* Deprecated options */
Opt_alloc_start,
Opt_recovery,
Opt_subvolrootid,
/* 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_nodiscard, "nodiscard"},
{Opt_nologreplay, "nologreplay"},
{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_usebackuproot, "usebackuproot"},
{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
/* Deprecated options */
{Opt_alloc_start, "alloc_start=%s"},
{Opt_recovery, "recovery"},
{Opt_subvolrootid, "subvolrootid=%d"},
/* 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},
};
/*
* 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;
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_subvolrootid:
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);
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;
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";
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 ((btrfs_test_opt(info, COMPRESS) &&
(info->compress_type != saved_compress_type ||
compress_force != saved_compress_force)) ||
(!btrfs_test_opt(info, COMPRESS) &&
no_compress == 1)) {
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_alloc_start:
btrfs_info(info,
"option alloc_start is obsolete, ignored");
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_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:
btrfs_set_and_info(info, DISCARD,
"turning on discard");
break;
case Opt_nodiscard:
btrfs_clear_and_info(info, DISCARD,
"turning off 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_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:
btrfs_warn(info,
"'recovery' is deprecated, use 'usebackuproot' instead");
/* fall through */
case Opt_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;
#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_info(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;
case Opt_subvolrootid:
pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n");
break;
default:
break;
}