Release 4.11 fs/btrfs/super.c

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/buffer_head.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/mpage.h>
#include <linux/swap.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/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 "hash.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 "tests/btrfs-tests.h"

#include "qgroup.h"

#define CREATE_TRACE_POINTS
#include <trace/events/btrfs.h>


static const struct super_operations btrfs_super_ops;

static struct file_system_type btrfs_fs_type;

static 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;
}

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/* btrfs handle error by forcing the filesystem readonly */


static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
{
	struct super_block *sb = fs_info->sb;

	if (sb->s_flags & MS_RDONLY)
		return;

	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
		sb->s_flags |= MS_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 writeable again, the device replace
                 * operation continues.
                 */
	}
}

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/*
 * __btrfs_handle_fs_error decodes expected errors from the caller and
 * invokes the approciate 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 MS_RDONLY, then it is safe here.
         */
	if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
  		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 & MS_BORN)
		btrfs_handle_error(fs_info);
}

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20
11.05%
1
9.09%
Anand Jain
19
10.50%
3
27.27%
David Sterba
5
2.76%
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Josef Bacik
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Frank Holton
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#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, ...)
{
	struct super_block *sb = fs_info->sb;
	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, sb->s_id, &vaf);

	va_end(args);
}
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28.57%
Joe Perches
24
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Nikolay Borisov
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Jim Meyering
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Simon Kirby
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#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);
}
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17
13.82%
1
9.09%
Filipe David Borba Manana
8
6.50%
1
9.09%
Seraphime Kirkovski
3
2.44%
1
9.09%
Simon Kirby
2
1.63%
1
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David Sterba
1
0.81%
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Anand Jain
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/*
 * __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 && (fs_info->mount_opt & BTRFS_MOUNT_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() */
}

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6
4.20%
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33.33%
Eric Sandeen
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Frank Holton
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2.10%
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6
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static void btrfs_put_super(struct super_block *sb)
{
	close_ctree(btrfs_sb(sb));
}

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enum {
	




Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
	




Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
	




Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
	


Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
	



Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
	


Opt_space_cache, Opt_space_cache_version, Opt_clear_cache,
	


Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid,
	



Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery,
	

Opt_skip_balance, Opt_check_integrity,
	
Opt_check_integrity_including_extent_data,
	


Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
	



Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
	



Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
	



Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot,
	

Opt_nologreplay, Opt_norecovery,
#ifdef CONFIG_BTRFS_DEBUG
	


Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
#endif
	
Opt_err,
};


static const match_table_t tokens = {
	{Opt_degraded, "degraded"},
	{Opt_subvol, "subvol=%s"},
	{Opt_subvolid, "subvolid=%s"},
	{Opt_device, "device=%s"},
	{Opt_nodatasum, "nodatasum"},
	{Opt_datasum, "datasum"},
	{Opt_nodatacow, "nodatacow"},
	{Opt_datacow, "datacow"},
	{Opt_nobarrier, "nobarrier"},
	{Opt_barrier, "barrier"},
	{Opt_max_inline, "max_inline=%s"},
	{Opt_alloc_start, "alloc_start=%s"},
	{Opt_thread_pool, "thread_pool=%d"},
	{Opt_compress, "compress"},
	{Opt_compress_type, "compress=%s"},
	{Opt_compress_force, "compress-force"},
	{Opt_compress_force_type, "compress-force=%s"},
	{Opt_ssd, "ssd"},
	{Opt_ssd_spread, "ssd_spread"},
	{Opt_nossd, "nossd"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
	{Opt_notreelog, "notreelog"},
	{Opt_treelog, "treelog"},
	{Opt_nologreplay, "nologreplay"},
	{Opt_norecovery, "norecovery"},
	{Opt_flushoncommit, "flushoncommit"},
	{Opt_noflushoncommit, "noflushoncommit"},
	{Opt_ratio, "metadata_ratio=%d"},
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
	{Opt_space_cache, "space_cache"},
	{Opt_space_cache_version, "space_cache=%s"},
	{Opt_clear_cache, "clear_cache"},
	{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
	{Opt_enospc_debug, "enospc_debug"},
	{Opt_noenospc_debug, "noenospc_debug"},
	{Opt_subvolrootid, "subvolrootid=%d"},
	{Opt_defrag, "autodefrag"},
	{Opt_nodefrag, "noautodefrag"},
	{Opt_inode_cache, "inode_cache"},
	{Opt_noinode_cache, "noinode_cache"},
	{Opt_no_space_cache, "nospace_cache"},
	{Opt_recovery, "recovery"}, /* deprecated */
	{Opt_usebackuproot, "usebackuproot"},
	{Opt_skip_balance, "skip_balance"},
	{Opt_check_integrity, "check_int"},
	{Opt_check_integrity_including_extent_data, "check_int_data"},
	{Opt_check_integrity_print_mask, "check_int_print_mask=%d"},
	{Opt_rescan_uuid_tree, "rescan_uuid_tree"},
	{Opt_fatal_errors, "fatal_errors=%s"},
	{Opt_commit_interval, "commit=%d"},
#ifdef CONFIG_BTRFS_DEBUG
	{Opt_fragment_data, "fragment=data"},
	{Opt_fragment_metadata, "fragment=metadata"},
	{Opt_fragment_all, "fragment=all"},
#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, *orig = NULL;
	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;

	/*
         * strsep changes the string, duplicate it because parse_options
         * gets called twice
         */
	options = kstrdup(options, GFP_NOFS);
	if (!options)
		return -ENOMEM;

	orig = options;

	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_subvolid:
		case Opt_subvolrootid:
		case Opt_device:
			/*
                         * These are parsed by btrfs_parse_early_options
                         * and can be happily 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 ||
			    strcmp(args[0].from, "zlib") == 0) {
				compress_type = "zlib";
				info->compress_type = BTRFS_COMPRESS_ZLIB;
				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 (strcmp(args[0].from, "lzo") == 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, "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",
					   (compress_force) ? "force" : "use",
					   compress_type);
			}
			compress_force = false;
			break;
		case Opt_ssd:
			btrfs_set_and_info(info, SSD,
					   "use ssd allocation scheme");
			btrfs_clear_opt(info->mount_opt, NOSSD);
			break;
		case Opt_ssd_spread:
			btrfs_set_and_info(info, SSD_SPREAD,
					   "use spread ssd allocation scheme");
			btrfs_set_opt(info->mount_opt, SSD);
			btrfs_clear_opt(info->mount_opt, NOSSD);
			break;
		case Opt_nossd:
			btrfs_set_and_info(info, NOSSD,
					     "not using ssd allocation scheme");
			btrfs_clear_opt(info->mount_opt, SSD);
			btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
			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) {
				info->thread_pool_size = intarg;
			} else {
				ret = -EINVAL;
				goto out;
			}
			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:
			num = match_strdup(&args[0]);
			if (num) {
				mutex_lock(&info->chunk_mutex);
				info->alloc_start = memparse(num, NULL);
				mutex_unlock(&info->chunk_mutex);
				kfree(num);
				btrfs_info(info, "allocations start at %llu",
					   info->alloc_start);
			} else {
				ret = -ENOMEM;
				goto out;
			}
			break;
		case Opt_acl:
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
			info->sb->s_flags |= MS_POSIXACL;
			break;
#else
			btrfs_err(info, "support for ACL not compiled in!");
			ret = -EINVAL;
			goto out;
#endif
		case Opt_noacl:
			info->sb->s_flags &= ~MS_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;
			} else if (intarg >= 0) {
				info->metadata_ratio = intarg;
				btrfs_info(info, "metadata ratio %d",
					   info->metadata_ratio);
			} else {
				ret = -EINVAL;
				goto out;
			}
			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");
		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;
			} else if (intarg >= 0) {
				info->check_integrity_print_mask = intarg;
				btrfs_info(info,
					   "check_integrity_print_mask 0x%x",
					   info->check_integrity_print_mask);
			} else {
				ret = -EINVAL;
				goto out;
			}
			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 < 0) {
				btrfs_err(info, "invalid commit interval");
				ret = -EINVAL;
				goto out;
			}
			if (intarg > 0) {
				if (intarg > 300) {
					btrfs_warn(info,
						"excessive commit interval %d",
						intarg);
				}
				info->commit_interval = intarg;
			} else {
				btrfs_info(info,
					   "using default commit interval %ds",
					   BTRFS_DEFAULT_COMMIT_INTERVAL);
				info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
			}
			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
		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 & MS_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");
	kfree(orig);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
389
18.86%
20
25.32%
Qu Wenruo
280
13.57%
14
17.72%
Josef Bacik
199
9.65%
9
11.39%
Omar Sandoval
177
8.58%
1
1.27%
Jeff Mahoney
140
6.79%
4
5.06%
Stefan Behrens
117
5.67%
2
2.53%
Tsutomu Itoh
100
4.85%
1
1.27%
Shilong Wang
99
4.80%
2
2.53%
Li Zefan
91
4.41%
2
2.53%
David Sterba
89
4.31%
3
3.80%
Andrei Popa
78
3.78%
1
1.27%
Arnd Hannemann
65
3.15%
1
1.27%
Sage Weil
53
2.57%
4
5.06%
Frank Holton
47
2.28%
1
1.27%
Adam Borowski
27
1.31%
1
1.27%
Christoph Hellwig
27
1.31%
3
3.80%
Miao Xie
23
1.11%
2
2.53%
Guangliang Zhao
21
1.02%
1
1.27%
Ilya Dryomov
13
0.63%
1
1.27%
Eric Sandeen
11
0.53%
2
2.53%
Mitch Harder
8
0.39%
2
2.53%
Akinobu Mita
6
0.29%
1
1.27%
Xin Zhong
3
0.15%
1
1.27%
Total
2063
100.00%
79
100.00%

/*
 * 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_early_options(const char *options, fmode_t flags,
		void *holder, char **subvol_name, u64 *subvol_objectid,
		struct btrfs_fs_devices **fs_devices)
{
	substring_t args[MAX_OPT_ARGS];
	char *device_name, *opts, *orig, *p;
	char *num = NULL;
	int error = 0;

	if (!options)
		return 0;

	/*
         * strsep changes the string, duplicate it because parse_options
         * gets called twice
         */
	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:
			num = match_strdup(&args[0]);
			if (num) {
				*subvol_objectid = memparse(num, NULL);
				kfree(num);
				/* we want the original fs_tree */
				if (!*subvol_objectid)
					*subvol_objectid =
						BTRFS_FS_TREE_OBJECTID;
			} else {
				error = -EINVAL;
				goto out;
			}
			break;
		case Opt_subvolrootid:
			pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n");
			break;
		case Opt_device:
			device_name = match_strdup(&args[0]);
			if (!device_name) {
				error = -ENOMEM;
				goto out;
			}
			error = btrfs_scan_one_device(device_name,
					flags, holder, fs_devices);
			kfree(device_name);
			if (error)
				goto out;
			break;
		default:
			break;
		}
	}

out:
	kfree(orig);
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
167
53.53%
3
20.00%
Shilong Wang
55
17.63%
2
13.33%
Josef Bacik
35
11.22%
3
20.00%
Jie Liu
30
9.62%
1
6.67%
Tero Roponen
8
2.56%
1
6.67%
Xin Zhong
7
2.24%
1
6.67%
Ilya Dryomov
6
1.92%
1
6.67%
Jeff Mahoney
2
0.64%
2
13.33%
Chris Mason
2
0.64%
1
6.67%
Total
312
100.00%
15
100.00%



static char *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;
	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_NOFS);
	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);

		key.objectid = subvol_objectid;
		key.type = BTRFS_ROOT_ITEM_KEY;
		key.offset = (u64)-1;
		fs_root = btrfs_read_fs_root_no_name(fs_info, &key);
		if (IS_ERR(fs_root)) {
			ret = PTR_ERR(fs_root);
			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_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_free_path(path);
	kfree(name);
	return ERR_PTR(ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Omar Sandoval
590
80.82%
1
16.67%
Josef Bacik
116
15.89%
1
16.67%
Jeff Mahoney
17
2.33%
1
16.67%
Dan Carpenter
3
0.41%
1
16.67%
Al Viro
2
0.27%
1
16.67%
Julia Lawall
2
0.27%
1
16.67%
Total
730
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Omar Sandoval
114
70.81%
1
25.00%
Josef Bacik
36
22.36%
1
25.00%
Jeff Mahoney
8
4.97%
1
25.00%
Dan Carpenter
3
1.86%
1
25.00%
Total
161
100.00%
4
100.00%



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);
	struct btrfs_key key;
	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 |= MS_POSIXACL;
#endif
	sb->s_flags |= MS_I_VERSION;
	sb->s_iflags |= SB_I_CGROUPWB;
	err = open_ctree(sb, fs_devices, (char *)data);
	if (err) {
		btrfs_err(fs_info, "open_ctree failed");
		return err;
	}

	key.objectid = BTRFS_FIRST_FREE_OBJECTID;
	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;
	inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL);
	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;
	}

	save_mount_options(sb, data);
	cleancache_init_fs(sb);
	sb->s_flags |= MS_ACTIVE;
	return 0;

fail_close:
	close_ctree(fs_info);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
156
62.15%
13
44.83%
Al Viro
31
12.35%
7
24.14%
Zheng Yan
24
9.56%
1
3.45%
Josef Bacik
20
7.97%
4
13.79%
Balaji Rao
7
2.79%
1
3.45%
Dan Magenheimer
5
1.99%
1
3.45%
Jeff Mahoney
4
1.59%
1
3.45%
Chris Ball
4
1.59%
1
3.45%
Total
251
100.00%
29
100.00%



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, -1, 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(sb, SB_FREEZE_WRITE, false))
				__sb_end_write(sb, SB_FREEZE_WRITE);
			else
				return 0;
			trans = btrfs_start_transaction(root, 0);
		}
		if (IS_ERR(trans))
			return PTR_ERR(trans);
	}
	return btrfs_commit_transaction(trans);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
51
29.82%
4
20.00%
David Sterba
27
15.79%
2
10.00%
Qu Wenruo
23
13.45%
1
5.00%
Josef Bacik
20
11.70%
2
10.00%
Tsutomu Itoh
12
7.02%
1
5.00%
Al Viro
11
6.43%
1
5.00%
Filipe David Borba Manana
8
4.68%
1
5.00%
Miao Xie
8
4.68%
4
20.00%
Liu Bo
5
2.92%
1
5.00%
Zheng Yan
2
1.17%
1
5.00%
Jeff Mahoney
2
1.17%
1
5.00%
Sage Weil
2
1.17%
1
5.00%
Total
171
100.00%
20
100.00%



static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
{
	struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
	char *compress_type;

	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->alloc_start != 0)
		seq_printf(seq, ",alloc_start=%llu", info->alloc_start);
	if (info->thread_pool_size !=  min_t(unsigned long,
					     num_online_cpus() + 2, 8))
		seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
	if (btrfs_test_opt(info, COMPRESS)) {
		if (info->compress_type == BTRFS_COMPRESS_ZLIB)
			compress_type = "zlib";
		else
			compress_type = "lzo";
		if (btrfs_test_opt(info, FORCE_COMPRESS))
			seq_printf(seq, ",compress-force=%s", compress_type);
		else
			seq_printf(seq, ",compress=%s", compress_type);
	}
	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, ",nologreplay");
	if (btrfs_test_opt(info, FLUSHONCOMMIT))
		seq_puts(seq, ",flushoncommit");
	if (btrfs_test_opt(info, DISCARD))
		seq_puts(seq, ",discard");
	if (!(info->sb->s_flags & MS_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=%d",
				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=%d", 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
	seq_printf(seq, ",subvolid=%llu",
		  BTRFS_I(d_inode(dentry))->root->root_key.objectid);
	seq_puts(seq, ",subvol=");
	seq_dentry(seq, dentry, " \t\n\\");
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Paris
196
28.53%
1
4.00%
Tsutomu Itoh
90
13.10%
1
4.00%
Shilong Wang
75
10.92%
1
4.00%
David Sterba
66
9.61%
3
12.00%
Omar Sandoval
53
7.71%
2
8.00%
Josef Bacik
42
6.11%
2
8.00%
Jeff Mahoney
38
5.53%
3
12.00%
Chris Mason
31
4.51%
2
8.00%
Sage Weil
30
4.37%
3
12.00%
Qu Wenruo
15
2.18%
1
4.00%
Matthew Wilcox
15
2.18%
1
4.00%
Stefan Behrens
15
2.18%
1
4.00%
Ilya Dryomov
14
2.04%
1
4.00%
Al Viro
6
0.87%
2
8.00%
Filipe David Borba Manana
1
0.15%
1
4.00%
Total
687
100.00%
25
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yan Zheng
19
46.34%
1
25.00%
Chris Mason
13
31.71%
1
25.00%
Al Viro
5
12.20%
1
25.00%
Josef Bacik
4
9.76%
1
25.00%
Total
41
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
21
53.85%
1
33.33%
Al Viro
16
41.03%
1
33.33%
Yan Zheng
2
5.13%
1
33.33%
Total
39
100.00%
3
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Sterba
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%

/*
 * This will add subvolid=0 to the argument string while removing any subvol=
 * and subvolid= arguments to make sure we get the top-level root for path
 * walking to the subvol we want.
 */


static char *setup_root_args(char *args)
{
	char *buf, *dst, *sep;

	if (!args)
		return kstrdup("subvolid=0", GFP_NOFS);

	/* The worst case is that we add ",subvolid=0" to the end. */
	buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS);
	if (!buf)
		return NULL;

	while (1) {
		sep = strchrnul(args, ',');
		if (!strstarts(args, "subvol=") &&
		    !strstarts(args, "subvolid=")) {
			memcpy(dst, args, sep - args);
			dst += sep - args;
			*dst++ = ',';
		}
		if (*sep)
			args = sep + 1;
		else
			break;
	}
	strcpy(dst, "subvolid=0");

	return buf;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Omar Sandoval
68
46.90%
1
33.33%
Josef Bacik
62
42.76%
1
33.33%
Jim Meyering
15
10.34%
1
33.33%
Total
145
100.00%
3
100.00%



static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
				   int flags, const char *device_name,
				   char *data)
{
	struct dentry *root;
	struct vfsmount *mnt = NULL;
	char *newargs;
	int ret;

	newargs = setup_root_args(data);
	if (!newargs) {
		root = ERR_PTR(-ENOMEM);
		goto out;
	}

	mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs);
	if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) {
		if (flags & MS_RDONLY) {
			mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY,
					     device_name, newargs);
		} else {
			mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY,
					     device_name, newargs);
			if (IS_ERR(mnt)) {
				root = ERR_CAST(mnt);
				mnt = NULL;
				goto out;
			}

			down_write(&mnt->mnt_sb->s_umount);
			ret = btrfs_remount(mnt->mnt_sb, &flags, NULL);
			up_write(&mnt->mnt_sb->s_umount);
			if (ret < 0) {
				root = ERR_PTR(ret);
				goto out;
			}
		}
	}
	if (IS_ERR(mnt)) {
		root = ERR_CAST(mnt);
		mnt = NULL;
		goto out;
	}

	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 = 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(newargs);
	kfree(subvol_name);
	return root;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Omar Sandoval
251
51.54%
4
22.22%
Harald Hoyer
89
18.28%
1
5.56%
Josef Bacik
70
14.37%
3
16.67%
Al Viro
22
4.52%
2
11.11%
Yan Zheng
20
4.11%
1
5.56%
Jeff Mahoney
18
3.70%
1
5.56%
David Sterba
8
1.64%
2
11.11%
Christoph Hellwig
6
1.23%
2
11.11%
Christoph Jaeger
2
0.41%
1
5.56%
Chris Mason
1
0.21%
1
5.56%
Total
487
100.00%
18
100.00%



static int parse_security_options(char *orig_opts,
				  struct security_mnt_opts *sec_opts)
{
	char *secdata = NULL;
	int ret = 0;

	secdata = alloc_secdata();
	if (!secdata)
		return -ENOMEM;
	ret = security_sb_copy_data(orig_opts, secdata);
	if (ret) {
		free_secdata(secdata);
		return ret;
	}
	ret = security_sb_parse_opts_str(secdata, sec_opts);
	free_secdata(secdata);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Qu Wenruo
80
100.00%
1
100.00%
Total
80
100.00%
1
100.00%



static int setup_security_options(struct btrfs_fs_info *fs_info,
				  struct super_block *sb,
				  struct security_mnt_opts *sec_opts)
{
	int ret = 0;

	/*
         * Call security_sb_set_mnt_opts() to check whether new sec_opts
         * is valid.
         */
	ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL);
	if (ret)
		return ret;

#ifdef CONFIG_SECURITY
	if (!fs_info->security_opts.num_mnt_opts) {
		/* first time security setup, copy sec_opts to fs_info */
		memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts));
	} else {
		/*
                 * Since SELinux (the only one supporting security_mnt_opts)
                 * does NOT support changing context during remount/mount of
                 * the same sb, this must be the same or part of the same
                 * security options, just free it.
                 */
		security_free_mnt_opts(sec_opts);
	}
#endif
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Qu Wenruo
91
98.91%
2
66.67%
Luis de Bethencourt
1
1.09%
1
33.33%
Total
92
100.00%
3
100.00%

/*
 * Find a superblock for the given device / mount point.
 *
 * Note:  This is based on get_sb_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(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_fs_devices *fs_devices = NULL;
	struct btrfs_fs_info *fs_info = NULL;
	struct security_mnt_opts new_sec_opts;
	fmode_t mode = FMODE_READ;
	char *subvol_name = NULL;
	u64 subvol_objectid = 0;
	int error = 0;

	if (!(flags & MS_RDONLY))
		mode |= FMODE_WRITE;

	error = btrfs_parse_early_options(data, mode, fs_type,
					  &subvol_name, &subvol_objectid,
					  &fs_devices);
	if (error) {
		kfree(subvol_name);
		return ERR_PTR(error);
	}

	if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
		/* mount_subvol() will free subvol_name. */
		return mount_subvol(subvol_name, subvol_objectid, flags,
				    device_name, data);
	}

	security_init_mnt_opts(&new_sec_opts);
	if (data) {
		error = parse_security_options(data, &new_sec_opts);
		if (error)
			return ERR_PTR(error);
	}

	error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);
	if (error)
		goto error_sec_opts;

	/*
         * 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
         * it for searching for existing supers, so this lets us do that and
         * then open_ctree will properly initialize everything later.
         */
	fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
	if (!fs_info) {
		error = -ENOMEM;
		goto error_sec_opts;
	}

	fs_info->fs_devices = fs_devices;

	fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
	fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
	security_init_mnt_opts(&fs_info->security_opts);
	if (!fs_info->super_copy || !fs_info->super_for_commit) {
		error = -ENOMEM;
		goto error_fs_info;
	}

	error = btrfs_open_devices(fs_devices, mode, fs_type);
	if (error)
		goto error_fs_info;

	if (!(flags & MS_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 | MS_NOSEC,
		 fs_info);
	if (IS_ERR(s)) {
		error = PTR_ERR(s);
		goto error_close_devices;
	}

	if (s->s_root) {
		btrfs_close_devices(fs_devices);
		free_fs_info(fs_info);
		if ((flags ^ s->s_flags) & MS_RDONLY)
			error = -EBUSY;
	} else {
		snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
		btrfs_sb(s)->bdev_holder = fs_type;
		error = btrfs_fill_super(s, fs_devices, data);
	}
	if (error) {
		deactivate_locked_super(s);
		goto error_sec_opts;
	}

	fs_info = btrfs_sb(s);
	error = setup_security_options(fs_info, s, &new_sec_opts);
	if (error) {
		deactivate_locked_super(s);
		goto error_sec_opts;
	}

	return dget(s->s_root);

error_close_devices:
	btrfs_close_devices(fs_devices);
error_fs_info:
	free_fs_info(fs_info);
error_sec_opts:
	security_free_mnt_opts(&new_sec_opts);
	return ERR_PTR(error);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
144
26.92%
3
10.34%
Qu Wenruo
101
18.88%
1
3.45%
Yan Zheng
79
14.77%
1
3.45%
Ilya Dryomov
67
12.52%
3
10.34%
David Sterba
46
8.60%
2
6.90%
Christoph Hellwig
21
3.93%
3
10.34%
Chris Mason
19
3.55%
5
17.24%
Al Viro
16
2.99%
2
6.90%
Omar Sandoval
15
2.80%
3
10.34%
Xin Zhong
8
1.50%
1
3.45%
Sergei Trofimovich
7
1.31%
1
3.45%
Dmitriy Monakhov
5
0.93%
1
3.45%
David Howells
4
0.75%
1
3.45%
Shen Feng
2
0.37%
1
3.45%
Zheng Yan
1
0.19%
1
3.45%
Total
535
100.00%
29
100.00%



static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
				     int new_pool_size, int 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->submit_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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sergei Trofimovich
132
88.59%
1
9.09%
Qu Wenruo
12
8.05%
8
72.73%
Frank Holton
4
2.68%
1
9.09%
Stefan Behrens
1
0.67%
1
9.09%
Total
149
100.00%
11
100.00%



static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info)
{
	set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
22
100.00%
2
100.00%
Total
22
100.00%
2
100.00%



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 & MS_RDONLY))) {
		/* wait for any defraggers to finish */
		wait_event(fs_info->transaction_wait,
			   (atomic_read(&fs_info->defrag_running) == 0));
		if (flags & MS_RDONLY)
			sync_filesystem(fs_info->sb);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
81
100.00%
2
100.00%
Total
81
100.00%
2
100.00%



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) ||
	     (fs_info->sb->s_flags & MS_RDONLY))) {
		btrfs_cleanup_defrag_inodes(fs_info);
	}

	clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
64
98.46%
1
50.00%
Luis de Bethencourt
1
1.54%
1
50.00%
Total
65
100.00%
2
100.00%



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;
	u64 old_alloc_start = fs_info->alloc_start;
	int old_thread_pool_size = fs_info->thread_pool_size;
	unsigned int old_metadata_ratio = fs_info->metadata_ratio;
	int ret;

	sync_filesystem(sb);
	btrfs_remount_prepare(fs_info);

	if (data) {
		struct security_mnt_opts new_sec_opts;

		security_init_mnt_opts(&new_sec_opts);
		ret = parse_security_options(data, &new_sec_opts);
		if (ret)
			goto restore;
		ret = setup_security_options(fs_info, sb,
					     &new_sec_opts);
		if (ret) {
			security_free_mnt_opts(&new_sec_opts);
			goto restore;
		}
	}

	ret = btrfs_parse_options(fs_info, data, *flags);
	if (ret) {
		ret = -EINVAL;
		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 ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		goto out;

	if (*flags & MS_RDONLY) {
		/*
                 * this also happens on 'umount -rf' or on shutdown, when
                 * the filesystem is busy.
                 */
		cancel_work_sync(&fs_info->async_reclaim_work);

		/* 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 |= MS_RDONLY;

		/*
                 * Setting MS_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);

		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 (fs_info->fs_devices->missing_devices >
		     fs_info->num_tolerated_disk_barrier_failures &&
		    !(*flags & MS_RDONLY)) {
			btrfs_warn(fs_info,
				"too many missing devices, writeable remount is not allowed");
			ret = -EACCES;
			goto restore;
		}

		if (btrfs_super_log_root(fs_info->super_copy) != 0) {
			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;
		}

		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 &= ~MS_RDONLY;

		set_bit(BTRFS_FS_OPEN, &fs_info->flags);
	}
out:
	wake_up_process(fs_info->transaction_kthread);
	btrfs_remount_cleanup(fs_info, old_opts);
	return 0;

restore:
	/* We've hit an error - don't reset MS_RDONLY */
	if (sb->s_flags & MS_RDONLY)
		old_flags |= MS_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;
	mutex_lock(&fs_info->chunk_mutex);
	fs_info->alloc_start = old_alloc_start;
	mutex_unlock(&fs_info->chunk_mutex);
	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);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Mahoney
156
23.49%
4
13.33%
Zheng Yan
124
18.67%
3
10.00%
Stefan Behrens
81
12.20%
3
10.00%
Miao Xie
63
9.49%
5
16.67%
Qu Wenruo
63
9.49%
2
6.67%
Josef Bacik
40
6.02%
2
6.67%
David Sterba
28
4.22%
1
3.33%
Sergei Trofimovich
22
3.31%
2
6.67%
Frank Holton
17
2.56%
1
3.33%
Shilong Wang
16
2.41%
1
3.33%
Chris Mason
14
2.11%
1
3.33%
Ilya Dryomov
14
2.11%
1
3.33%
Al Viro
11
1.66%
1
3.33%
Justin Maggard
7
1.05%
1
3.33%
Theodore Y. Ts'o
5
0.75%
1
3.33%
Zygo Blaxell
3
0.45%
1
3.33%
Total
664
100.00%
30
100.00%

/* Used to sort the devices by max_avail(descending sort) */


static 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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Arne Jansen
76
100.00%
1
100.00%
Total
76
100.00%
1
100.00%

/*
 * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arne Jansen
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%

/*
 * The helper to calc the free space on the devices that can be used to store
 * file data.
 */


static int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
				       u64 *free_bytes)
{
	struct btrfs_root *root = fs_info->tree_root;
	struct btrfs_device_info *devices_info;
	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
	struct btrfs_device *device;
	u64 skip_space;
	u64 type;
	u64 avail_space;
	u64 used_space;
	u64 min_stripe_size;
	int min_stripes = 1, num_stripes = 1;
	int i = 0, nr_devices;
	int ret;

	/*
         * 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_NOFS);
	if (!devices_info)
		return -ENOMEM;

	/* calc min stripe number for data space allocation */
	type = btrfs_get_alloc_profile(root, 1);
	if (type & BTRFS_BLOCK_GROUP_RAID0) {
		min_stripes = 2;
		num_stripes = nr_devices;
	} else if (type & BTRFS_BLOCK_GROUP_RAID1) {
		min_stripes = 2;
		num_stripes = 2;
	} else if (type & BTRFS_BLOCK_GROUP_RAID10) {
		min_stripes = 4;
		num_stripes = 4;
	}

	if (type & BTRFS_BLOCK_GROUP_DUP)
		min_stripe_size = 2 * BTRFS_STRIPE_LEN;
	else
		min_stripe_size = BTRFS_STRIPE_LEN;

	if (fs_info->alloc_start)
		mutex_lock(&fs_devices->device_list_mutex);
	rcu_read_lock();
	list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
		if (!device->in_fs_metadata || !device->bdev ||
		    device->is_tgtdev_for_dev_replace)
			continue;

		if (i >= nr_devices)
			break;

		avail_space = device->total_bytes - device->bytes_used;

		/* align with stripe_len */
		avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN);
		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.
                 */
		skip_space = SZ_1M;

		/* user can set the offset in fs_info->alloc_start. */
		if (fs_info->alloc_start &&
		    fs_info->alloc_start + BTRFS_STRIPE_LEN <=
		    device->total_bytes) {
			rcu_read_unlock();
			skip_space = max(fs_info->alloc_start, skip_space);

			/*
                         * btrfs can not use the free space in
                         * [0, skip_space - 1], we must subtract it from the
                         * total. In order to implement it, we account the used
                         * space in this range first.
                         */
			ret = btrfs_account_dev_extents_size(device, 0,
							     skip_space - 1,
							     &used_space);
			if (ret) {
				kfree(devices_info);
				mutex_unlock(&fs_devices->device_list_mutex);
				return ret;
			}

			rcu_read_lock();

			/* calc the free space in [0, skip_space - 1] */
			skip_space -= used_space;
		}

		/*
                 * we can use the free space in [0, skip_space - 1], subtract
                 * it from the total.
                 */
		if (avail_space && avail_space >= skip_space)
			avail_space -= skip_space;
		else
			avail_space = 0;

		if (avail_space < min_stripe_size)
			continue;

		devices_info[i].dev = device;
		devices_info[i].max_avail = avail_space;

		i++;
	}
	rcu_read_unlock();
	if (fs_info->alloc_start)
		mutex_unlock(&fs_devices->device_list_mutex);

	nr_devices = i;

	btrfs_descending_sort_devices(devices_info, nr_devices);

	i = nr_devices - 1;
	avail_space = 0;
	while (nr_devices >= min_stripes) {
		if (num_stripes > nr_devices)
			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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
415
72.68%
2
16.67%
Josef Bacik
97
16.99%
1
8.33%
Zheng Yan
31
5.43%
2
16.67%
Li Zefan
8
1.40%
1
8.33%
Jeff Mahoney
6
1.05%
1
8.33%
Stefan Behrens
4
0.70%
1
8.33%
Dulshani Gunawardhana
3
0.53%
1
8.33%
Nicholas D Steeves
3
0.53%
1
8.33%
David Sterba
3
0.53%
1
8.33%
Byongho Lee
1
0.18%
1
8.33%
Total
571
100.00%
12
100.00%

/*
 * 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, order of allocations and the
 * 'alloc_start' value, 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 list_head *head = &fs_info->space_info;
	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->fsid;
	unsigned factor = 1;
	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
	int ret;
	u64 thresh = 0;
	int mixed = 0;

	rcu_read_lock();
	list_for_each_entry_rcu(found, head, 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])) {
					switch (i) {
					case BTRFS_RAID_DUP:
					case BTRFS_RAID_RAID1:
					case BTRFS_RAID_RAID10:
						factor = 2;
					}
				}
			}
		}

		/*
                 * 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;
	}

	rcu_read_unlock();

	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 = 4 * 1024 * 1024;

	if (!mixed && 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->objectid >> 32;
	buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Sterba
189
35.06%
3
12.50%
David Woodhouse
101
18.74%
2
8.33%
Chris Mason
77
14.29%
10
41.67%
Josef Bacik
63
11.69%
2
8.33%
Miao Xie
52
9.65%
2
8.33%
Luis de Bethencourt
47
8.72%
2
8.33%
David Howells
6
1.11%
1
4.17%
Al Viro
3
0.56%
1
4.17%
Zheng Yan
1
0.19%
1
4.17%
Total
539
100.00%
24
100.00%



static void btrfs_kill_super(struct super_block *sb)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
	kill_anon_super(sb);
	free_fs_info(fs_info);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
31
100.00%
2
100.00%
Total
31
100.00%
2
100.00%


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,
};
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;
}

Contributors
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Tom Van Braeckel
26
100.00%
1
100.00%
Total
26
100.00%
1
100.00%

/*
 * used by btrfsctl to scan devices when no FS is mounted
 */


static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
				unsigned long arg)
{
	struct btrfs_ioctl_vol_args *vol;
	struct btrfs_fs_devices *fs_devices;
	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);

	switch (cmd) {
	case BTRFS_IOC_SCAN_DEV:
		ret = btrfs_scan_one_device(vol->name, FMODE_READ,
					    &btrfs_fs_type, &fs_devices);
		break;
	case BTRFS_IOC_DEVICES_READY:
		ret = btrfs_scan_one_device(vol->name, FMODE_READ,
					    &btrfs_fs_type, &fs_devices);
		if (ret)
			break;
		ret = !(fs_devices->num_devices == fs_devices->total_devices);
		break;
	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
		ret = btrfs_ioctl_get_supported_features((void __user*)arg);
		break;
	}

	kfree(vol);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
94
55.95%
3
33.33%
Josef Bacik
39
23.21%
1
11.11%
David Sterba
16
9.52%
1
11.11%
Li Zefan
13
7.74%
1
11.11%
Américo Wang
3
1.79%
1
11.11%
Linda Knippers
2
1.19%
1
11.11%
Christoph Hellwig
1
0.60%
1
11.11%
Total
168
100.00%
9
100.00%



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;

	fs_info->fs_frozen = 1;
	/*
         * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
52
61.90%
2
33.33%
Jeff Mahoney
9
10.71%
1
16.67%
Xiaoguang Wang
9
10.71%
1
16.67%
Yan Zheng
9
10.71%
1
16.67%
Linus Torvalds
5
5.95%
1
16.67%
Total
84
100.00%
6
100.00%



static int btrfs_unfreeze(struct super_block *sb)
{
	btrfs_sb(sb)->fs_frozen = 0;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Xiaoguang Wang
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



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_fs_devices *cur_devices;
	struct btrfs_device *dev, *first_dev = NULL;
	struct list_head *head;
	struct rcu_string *name;

	mutex_lock(&fs_info->fs_devices->device_list_mutex);
	cur_devices = fs_info->fs_devices;
	while (cur_devices) {
		head = &cur_devices->devices;
		list_for_each_entry(dev, head, dev_list) {
			if (dev->missing)
				continue;
			if (!dev->name)
				continue;
			if (!first_dev || dev->devid < first_dev->devid)
				first_dev = dev;
		}
		cur_devices = cur_devices->seed;
	}

	if (first_dev) {
		rcu_read_lock();
		name = rcu_dereference(first_dev->name);
		seq_escape(m, name->str, " \t\n\\");
		rcu_read_unlock();
	} else {
		WARN_ON(1);
	}
	mutex_unlock(&fs_info->fs_devices->device_list_mutex);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
175
95.63%
2
66.67%
Anand Jain
8
4.37%
1
33.33%
Total
183
100.00%
3
100.00%


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,
	.write_inode	= btrfs_write_inode,
	.alloc_inode	= btrfs_alloc_inode,
	.destroy_inode	= btrfs_destroy_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 = btrfs_control_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 btrfs_interface_init(void)
{
	return misc_register(&btrfs_misc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static void btrfs_interface_exit(void)
{
	misc_deregister(&btrfs_misc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
13
92.86%
1
50.00%
Christoph Hellwig
1
7.14%
1
50.00%
Total
14
100.00%
2
100.00%



static void btrfs_print_mod_info(void)
{
	pr_info("Btrfs loaded, crc32c=%s"
#ifdef CONFIG_BTRFS_DEBUG
			", debug=on"
#endif
#ifdef CONFIG_BTRFS_ASSERT
			", assert=on"
#endif
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
			", integrity-checker=on"
#endif
			"\n",
			btrfs_crc32c_impl());
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Sterba
23
65.71%
1
20.00%
Stefan Behrens
6
17.14%
1
20.00%
Jeff Mahoney
5
14.29%
2
40.00%
Anand Jain
1
2.86%
1
20.00%
Total
35
100.00%
5
100.00%



static int __init init_btrfs_fs(void)
{
	int err;

	err = btrfs_hash_init();
	if (err)
		return err;

	btrfs_props_init();

	err = btrfs_init_sysfs();
	if (err)
		goto free_hash;

	btrfs_init_compress();

	err = btrfs_init_cachep();
	if (err)
		goto free_compress;

	err = extent_io_init();
	if (err)
		goto free_cachep;

	err = extent_map_init();
	if (err)
		goto free_extent_io;

	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_io:
	extent_io_exit();
free_cachep:
	btrfs_destroy_cachep();
free_compress:
	btrfs_exit_compress();
	btrfs_exit_sysfs();
free_hash:
	btrfs_hash_exit();
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Miao Xie
67
25.38%
4
21.05%
Chris Mason
58
21.97%
5
26.32%
Wyatt Banks
35
13.26%
1
5.26%
Josef Bacik
26
9.85%
2
10.53%
Filipe David Borba Manana
23
8.71%
2
10.53%
David Sterba
20
7.58%
2
10.53%
Li Zefan
18
6.82%
1
5.26%
Shilong Wang
16
6.06%
1
5.26%
Anand Jain
1
0.38%
1
5.26%
Total
264
100.00%
19
100.00%



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_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();
	btrfs_hash_exit();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Mason
32
56.14%
8
47.06%
Miao Xie
12
21.05%
4
23.53%
Josef Bacik
6
10.53%
2
11.76%
Shilong Wang
3
5.26%
1
5.88%
Filipe David Borba Manana
3
5.26%
1
5.88%
Li Zefan
1
1.75%
1
5.88%
Total
57
100.00%
17
100.00%


late_initcall(init_btrfs_fs);
module_exit(exit_btrfs_fs)

MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
1346
12.59%
31
9.60%
Chris Mason
1341
12.54%
61
18.89%
Omar Sandoval
1279
11.96%
7
2.17%
Miao Xie
888
8.30%
20
6.19%
Jeff Mahoney
785
7.34%
16
4.95%
Qu Wenruo
772
7.22%
25
7.74%
David Sterba
586
5.48%
24
7.43%
Shilong Wang
268
2.51%
6
1.86%
Stefan Behrens
259
2.42%
8
2.48%
Christoph Hellwig
238
2.23%
5
1.55%
Liu Bo
203
1.90%
2
0.62%
Tsutomu Itoh
202
1.89%
3
0.93%
Eric Paris
200
1.87%
1
0.31%
Zheng Yan
193
1.80%
6
1.86%
Al Viro
161
1.51%
14
4.33%
Sergei Trofimovich
161
1.51%
3
0.93%
Li Zefan
153
1.43%
4
1.24%
Yan Zheng
138
1.29%
2
0.62%
Nikolay Borisov
127
1.19%
1
0.31%
Ilya Dryomov
122
1.14%
6
1.86%
Arne Jansen
110
1.03%
1
0.31%
Harald Hoyer
107
1.00%
1
0.31%
Sage Weil
105
0.98%
5
1.55%
David Woodhouse
101
0.94%
2
0.62%
Andrei Popa
78
0.73%
1
0.31%
Frank Holton
73
0.68%
1
0.31%
Arnd Hannemann
65
0.61%
1
0.31%
Filipe David Borba Manana
52
0.49%
6
1.86%
Luis de Bethencourt
49
0.46%
3
0.93%
Petr Mladek
40
0.37%
2
0.62%
Xiaoguang Wang
37
0.35%
1
0.31%
Wyatt Banks
35
0.33%
1
0.31%
Eric Sandeen
35
0.33%
4
1.24%
Anand Jain
34
0.32%
5
1.55%
Tom Van Braeckel
31
0.29%
1
0.31%
Jie Liu
30
0.28%
1
0.31%
Joe Perches
28
0.26%
1
0.31%
Adam Borowski
27
0.25%
1
0.31%
Xin Zhong
26
0.24%
1
0.31%
Jim Meyering
22
0.21%
2
0.62%
Guangliang Zhao
21
0.20%
1
0.31%
Matthew Wilcox
15
0.14%
1
0.31%
Kay Sievers
11
0.10%
1
0.31%
David Howells
10
0.09%
2
0.62%
Balaji Rao
8
0.07%
1
0.31%
Mitch Harder
8
0.07%
2
0.62%
Tero Roponen
8
0.07%
1
0.31%
Simon Kirby
8
0.07%
1
0.31%
Dan Magenheimer
8
0.07%
1
0.31%
Justin Maggard
7
0.07%
1
0.31%
Linus Torvalds
7
0.07%
1
0.31%
Dan Carpenter
6
0.06%
2
0.62%
Akinobu Mita
6
0.06%
1
0.31%
Theodore Y. Ts'o
5
0.05%
1
0.31%
Arnd Bergmann
5
0.05%
1
0.31%
Dmitriy Monakhov
5
0.05%
1
0.31%
Eric W. Biedermann
5
0.05%
1
0.31%
Nicholas D Steeves
4
0.04%
1
0.31%
Chris Ball
4
0.04%
1
0.31%
Filipe Brandenburger
3
0.03%
1
0.31%
Américo Wang
3
0.03%
1
0.31%
Dulshani Gunawardhana
3
0.03%
1
0.31%
Mark Fasheh
3
0.03%
1
0.31%
Seraphime Kirkovski
3
0.03%
1
0.31%
Zygo Blaxell
3
0.03%
1
0.31%
Qinghuang Feng
3
0.03%
1
0.31%
Tejun Heo
3
0.03%
1
0.31%
Shen Feng
2
0.02%
1
0.31%
Alexey Dobriyan
2
0.02%
1
0.31%
Julia Lawall
2
0.02%
1
0.31%
Linda Knippers
2
0.02%
1
0.31%
Christoph Jaeger
2
0.02%
1
0.31%
Byongho Lee
1
0.01%
1
0.31%
Andi Kleen
1
0.01%
1
0.31%
Total
10694
100.00%
323
100.00%
Directory: fs/btrfs

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