/*
 * fs/f2fs/gc.h
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#define GC_THREAD_MIN_WB_PAGES		1	/*
						 * a threshold to determine
						 * whether IO subsystem is idle
						 * or not
						 */
#define DEF_GC_THREAD_MIN_SLEEP_TIME	30000	/* milliseconds */
#define DEF_GC_THREAD_MAX_SLEEP_TIME	60000
#define DEF_GC_THREAD_NOGC_SLEEP_TIME	300000	/* wait 5 min */
#define LIMIT_INVALID_BLOCK	40 /* percentage over total user space */
#define LIMIT_FREE_BLOCK	40 /* percentage over invalid + free space */

/* Search max. number of dirty segments to select a victim segment */
#define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */

struct f2fs_gc_kthread {
	struct task_struct *f2fs_gc_task;
	wait_queue_head_t gc_wait_queue_head;

	/* for gc sleep time */
	unsigned int min_sleep_time;
	unsigned int max_sleep_time;
	unsigned int no_gc_sleep_time;

	/* for changing gc mode */
	unsigned int gc_idle;
};

struct gc_inode_list {
	struct list_head ilist;
	struct radix_tree_root iroot;
};

/*
 * inline functions
 */
static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
{
	if (free_segments(sbi) < overprovision_segments(sbi))
		return 0;
	else
		return (free_segments(sbi) - overprovision_segments(sbi))
			<< sbi->log_blocks_per_seg;
}

static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
{
	return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
}

static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
{
	block_t reclaimable_user_blocks = sbi->user_block_count -
		written_block_count(sbi);
	return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
}

static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
								long *wait)
{
	if (*wait == gc_th->no_gc_sleep_time)
		return;

	*wait += gc_th->min_sleep_time;
	if (*wait > gc_th->max_sleep_time)
		*wait = gc_th->max_sleep_time;
}

static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
								long *wait)
{
	if (*wait == gc_th->no_gc_sleep_time)
		*wait = gc_th->max_sleep_time;

	*wait -= gc_th->min_sleep_time;
	if (*wait <= gc_th->min_sleep_time)
		*wait = gc_th->min_sleep_time;
}

static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
{
	block_t invalid_user_blocks = sbi->user_block_count -
					written_block_count(sbi);
	/*
	 * Background GC is triggered with the following conditions.
	 * 1. There are a number of invalid blocks.
	 * 2. There is not enough free space.
	 */
	if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
			free_user_blocks(sbi) < limit_free_user_blocks(sbi))
		return true;
	return false;
}
85e7f32437b530d5bb7cb916142fa'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?h=nds-private-remove&amp;id=3d88460dbd285e7f32437b530d5bb7cb916142fa'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/usb?h=nds-private-remove&amp;id=3d88460dbd285e7f32437b530d5bb7cb916142fa'>usb</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/usb?h=nds-private-remove&amp;id=3d88460dbd285e7f32437b530d5bb7cb916142fa&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
ux/net-next.git/commit/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08'>mx27vis-aic32x4.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='0e0694ff1a7791274946b7f51bae692da0001a08'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Mauro Carvalho Chehab &lt;mchehab@s-opensource.com&gt;</td><td class='right'>2016-12-26 14:09:28 -0200</td></tr>
<tr><th>committer</th><td>Mauro Carvalho Chehab &lt;mchehab@s-opensource.com&gt;</td><td class='right'>2016-12-26 14:09:28 -0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08'>0e0694ff1a7791274946b7f51bae692da0001a08</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/fsl/mx27vis-aic32x4.c?id=0e0694ff1a7791274946b7f51bae692da0001a08'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08'>53d28f58d793c151aa870f17d38ddec6ac01ec7a</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08'>sound/soc/fsl/mx27vis-aic32x4.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=65390ea01ce678379da32b01f39fcfac4903f256'>65390ea01ce678379da32b01f39fcfac4903f256</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08&amp;id2=65390ea01ce678379da32b01f39fcfac4903f256'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=c739c0a7c3c2472d7562b8f802cdce44d2597c8b'>c739c0a7c3c2472d7562b8f802cdce44d2597c8b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/fsl/mx27vis-aic32x4.c?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08&amp;id2=c739c0a7c3c2472d7562b8f802cdce44d2597c8b'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'patchwork' into v4l_for_linus</div><div class='commit-msg'>* patchwork:
  [media] s5k4ecgx: select CRC32 helper
  [media] dvb: avoid warning in dvb_net
  [media] v4l: tvp5150: Don't override output pinmuxing at stream on/off time
  [media] v4l: tvp5150: Fix comment regarding output pin muxing
  [media] v4l: tvp5150: Reset device at probe time, not in get/set format handlers
  [media] pctv452e: move buffer to heap, no mutex
  [media] media/cobalt: use pci_irq_allocate_vectors
  [media] cec: fix race between configuring and unconfiguring
  [media] cec: move cec_report_phys_addr into cec_config_thread_func
  [media] cec: replace cec_report_features by cec_fill_msg_report_features
  [media] cec: update log_addr[] before finishing configuration
  [media] cec: CEC_MSG_GIVE_FEATURES should abort for CEC version &lt; 2
  [media] cec: when canceling a message, don't overwrite old status info
  [media] cec: fix report_current_latency
  [media] smiapp: Make suspend and resume functions __maybe_unused
  [media] smiapp: Implement power-on and power-off sequences without runtime PM
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=0e0694ff1a7791274946b7f51bae692da0001a08'>Diffstat</a> (limited to 'sound/soc/fsl/mx27vis-aic32x4.c')</div><table summary='diffstat' class='diffstat'>