/*
 * 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;
}
t.cgi/linux/net-next.git/commit/include?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/crypto?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>crypto</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>poly1305.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-27 12:29:30 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-27 12:29:30 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>dd3b9f25c867cb2507a45e436d6ede8eb08e7b05</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>1ec6c08cd75610083d117a2c8d5eb0829e65f33e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>include/crypto/poly1305.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/poly1305.h?id=69978aa0f21f43529e11f924504dadb6ce2f229a'>69978aa0f21f43529e11f924504dadb6ce2f229a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05&amp;id2=69978aa0f21f43529e11f924504dadb6ce2f229a'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/poly1305.h?id=b4cfe3971f6eab542dd7ecc398bfa1aeec889934'>b4cfe3971f6eab542dd7ecc398bfa1aeec889934</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/poly1305.h?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05&amp;id2=b4cfe3971f6eab542dd7ecc398bfa1aeec889934'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma</div><div class='commit-msg'>Pull rdma fixes from Doug Ledford:
 "Second round of -rc fixes for 4.10.

  This -rc cycle has been slow for the rdma subsystem. I had already
  sent you the first batch before the Holiday break. After that, we kept
  only getting a few here or there. Up until this week, when I got a
  drop of 13 to one driver (qedr). So, here's the -rc patches I have. I
  currently have none held in reserve, so unless something new comes in,
  this is it until the next merge window opens.

  Summary:

   - series of iw_cxgb4 fixes to make it work with the drain cq API

   - one or two patches each to: srp, iser, cxgb3, vmw_pvrdma, umem,
     rxe, and ipoib

   - one big series (13 patches) for the new qedr driver"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (27 commits)
  RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled
  IB/rxe: Prevent from completer to operate on non valid QP
  IB/rxe: Fix rxe dev insertion to rxe_dev_list
  IB/umem: Release pid in error and ODP flow
  RDMA/qedr: Dispatch port active event from qedr_add
  RDMA/qedr: Fix and simplify memory leak in PD alloc
  RDMA/qedr: Fix RDMA CM loopback
  RDMA/qedr: Fix formatting
  RDMA/qedr: Mark three functions as static
  RDMA/qedr: Don't reset QP when queues aren't flushed
  RDMA/qedr: Don't spam dmesg if QP is in error state
  RDMA/qedr: Remove CQ spinlock from CM completion handlers
  RDMA/qedr: Return max inline data in QP query result
  RDMA/qedr: Return success when not changing QP state
  RDMA/qedr: Add uapi header qedr-abi.h
  RDMA/qedr: Fix MTU returned from QP query
  RDMA/core: Add the function ib_mtu_int_to_enum
  IB/vmw_pvrdma: Fix incorrect cleanup on pvrdma_pci_probe error path
  IB/vmw_pvrdma: Don't leak info from alloc_ucontext
  IB/cxgb3: fix misspelling in header guard
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dd3b9f25c867cb2507a45e436d6ede8eb08e7b05'>Diffstat</a> (limited to 'include/crypto/poly1305.h')</div><table summary='diffstat' class='diffstat'>