#include "node.h"
#include "segment.h"
#include "gc.h"
+#include <trace/events/f2fs.h>
static struct kmem_cache *winode_slab;
if (kthread_should_stop())
break;
- f2fs_balance_fs(sbi);
-
- if (!test_opt(sbi, BG_GC))
+ if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
+ wait_ms = GC_THREAD_MAX_SLEEP_TIME;
continue;
+ }
/*
* [GC triggering condition]
sbi->bg_gc++;
- if (f2fs_gc(sbi) == GC_NONE)
+ /* if return value is not zero, no victim was selected */
+ if (f2fs_gc(sbi))
wait_ms = GC_THREAD_NOGC_SLEEP_TIME;
else if (wait_ms == GC_THREAD_NOGC_SLEEP_TIME)
wait_ms = GC_THREAD_MAX_SLEEP_TIME;
int start_gc_thread(struct f2fs_sb_info *sbi)
{
struct f2fs_gc_kthread *gc_th;
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ if (!test_opt(sbi, BG_GC))
+ return 0;
gc_th = kmalloc(sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
if (!gc_th)
return -ENOMEM;
sbi->gc_thread = gc_th;
init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
- GC_THREAD_NAME);
+ "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(gc_th->f2fs_gc_task)) {
kfree(gc_th);
+ sbi->gc_thread = NULL;
return -ENOMEM;
}
return 0;
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
- if (p->alloc_mode) {
+ if (p->alloc_mode == SSR) {
p->gc_mode = GC_GREEDY;
p->dirty_segmap = dirty_i->dirty_segmap[type];
p->ofs_unit = 1;
static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
struct victim_sel_policy *p)
{
+ /* SSR allocates in a segment unit */
+ if (p->alloc_mode == SSR)
+ return 1 << sbi->log_blocks_per_seg;
if (p->gc_mode == GC_GREEDY)
return (1 << sbi->log_blocks_per_seg) * p->ofs_unit;
else if (p->gc_mode == GC_CB)
static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
- unsigned int segno;
+ unsigned int hint = 0;
+ unsigned int secno;
/*
* If the gc_type is FG_GC, we can select victim segments
* selected by background GC before.
* Those segments guarantee they have small valid blocks.
*/
- segno = find_next_bit(dirty_i->victim_segmap[BG_GC],
- TOTAL_SEGS(sbi), 0);
- if (segno < TOTAL_SEGS(sbi)) {
- clear_bit(segno, dirty_i->victim_segmap[BG_GC]);
- return segno;
+next:
+ secno = find_next_bit(dirty_i->victim_secmap, TOTAL_SECS(sbi), hint++);
+ if (secno < TOTAL_SECS(sbi)) {
+ if (sec_usage_check(sbi, secno))
+ goto next;
+ clear_bit(secno, dirty_i->victim_secmap);
+ return secno * sbi->segs_per_sec;
}
return NULL_SEGNO;
}
}
/*
- * This function is called from two pathes.
+ * This function is called from two paths.
* One is garbage collection and the other is SSR segment selection.
* When it is called during GC, it just gets a victim segment
* and it does not remove it from dirty seglist.
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
struct victim_sel_policy p;
- unsigned int segno;
+ unsigned int secno;
int nsearched = 0;
p.alloc_mode = alloc_mode;
while (1) {
unsigned long cost;
+ unsigned int segno;
segno = find_next_bit(p.dirty_segmap,
TOTAL_SEGS(sbi), p.offset);
break;
}
p.offset = ((segno / p.ofs_unit) * p.ofs_unit) + p.ofs_unit;
+ secno = GET_SECNO(sbi, segno);
- if (test_bit(segno, dirty_i->victim_segmap[FG_GC]))
- continue;
- if (gc_type == BG_GC &&
- test_bit(segno, dirty_i->victim_segmap[BG_GC]))
+ if (sec_usage_check(sbi, secno))
continue;
- if (IS_CURSEC(sbi, GET_SECNO(sbi, segno)))
+ if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
continue;
cost = get_gc_cost(sbi, segno, &p);
}
got_it:
if (p.min_segno != NULL_SEGNO) {
- *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
if (p.alloc_mode == LFS) {
- int i;
- for (i = 0; i < p.ofs_unit; i++)
- set_bit(*result + i,
- dirty_i->victim_segmap[gc_type]);
+ secno = GET_SECNO(sbi, p.min_segno);
+ if (gc_type == FG_GC)
+ sbi->cur_victim_sec = secno;
+ else
+ set_bit(secno, dirty_i->victim_secmap);
}
+ *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
+
+ trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
+ sbi->cur_victim_sec,
+ prefree_segments(sbi), free_segments(sbi));
}
mutex_unlock(&dirty_i->seglist_lock);
sentry = get_seg_entry(sbi, segno);
ret = f2fs_test_bit(offset, sentry->cur_valid_map);
mutex_unlock(&sit_i->sentry_lock);
- return ret ? GC_OK : GC_NEXT;
+ return ret;
}
/*
* On validity, copy that node with cold status, otherwise (invalid node)
* ignore that.
*/
-static int gc_node_segment(struct f2fs_sb_info *sbi,
+static void gc_node_segment(struct f2fs_sb_info *sbi,
struct f2fs_summary *sum, unsigned int segno, int gc_type)
{
bool initial = true;
for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
nid_t nid = le32_to_cpu(entry->nid);
struct page *node_page;
- int err;
- /*
- * It makes sure that free segments are able to write
- * all the dirty node pages before CP after this CP.
- * So let's check the space of dirty node pages.
- */
- if (should_do_checkpoint(sbi)) {
- mutex_lock(&sbi->cp_mutex);
- block_operations(sbi);
- return GC_BLOCKED;
- }
+ /* stop BG_GC if there is not enough free sections. */
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
+ return;
- err = check_valid_map(sbi, segno, off);
- if (err == GC_NEXT)
+ if (check_valid_map(sbi, segno, off) == 0)
continue;
if (initial) {
continue;
/* set page dirty and write it */
- if (!PageWriteback(node_page))
+ if (gc_type == FG_GC) {
+ f2fs_submit_bio(sbi, NODE, true);
+ wait_on_page_writeback(node_page);
set_page_dirty(node_page);
+ } else {
+ if (!PageWriteback(node_page))
+ set_page_dirty(node_page);
+ }
f2fs_put_page(node_page, 1);
stat_inc_node_blk_count(sbi, 1);
}
.for_reclaim = 0,
};
sync_node_pages(sbi, 0, &wbc);
+
+ /*
+ * In the case of FG_GC, it'd be better to reclaim this victim
+ * completely.
+ */
+ if (get_valid_blocks(sbi, segno, 1) != 0)
+ goto next_step;
}
- return GC_DONE;
}
/*
node_page = get_node_page(sbi, nid);
if (IS_ERR(node_page))
- return GC_NEXT;
+ return 0;
get_node_info(sbi, nid, dni);
if (sum->version != dni->version) {
f2fs_put_page(node_page, 1);
- return GC_NEXT;
+ return 0;
}
*nofs = ofs_of_node(node_page);
f2fs_put_page(node_page, 1);
if (source_blkaddr != blkaddr)
- return GC_NEXT;
- return GC_OK;
+ return 0;
+ return 1;
}
static void move_data_page(struct inode *inode, struct page *page, int gc_type)
{
- if (page->mapping != inode->i_mapping)
- goto out;
-
- if (inode != page->mapping->host)
- goto out;
-
- if (PageWriteback(page))
- goto out;
-
if (gc_type == BG_GC) {
+ if (PageWriteback(page))
+ goto out;
set_page_dirty(page);
set_cold_data(page);
} else {
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
- mutex_lock_op(sbi, DATA_WRITE);
+
+ if (PageWriteback(page)) {
+ f2fs_submit_bio(sbi, DATA, true);
+ wait_on_page_writeback(page);
+ }
+
if (clear_page_dirty_for_io(page) &&
S_ISDIR(inode->i_mode)) {
dec_page_count(sbi, F2FS_DIRTY_DENTS);
}
set_cold_data(page);
do_write_data_page(page);
- mutex_unlock_op(sbi, DATA_WRITE);
clear_cold_data(page);
}
out:
* If the parent node is not valid or the data block address is different,
* the victim data block is ignored.
*/
-static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
+static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
struct list_head *ilist, unsigned int segno, int gc_type)
{
struct super_block *sb = sbi->sb;
struct f2fs_summary *entry;
block_t start_addr;
- int err, off;
+ int off;
int phase = 0;
start_addr = START_BLOCK(sbi, segno);
unsigned int ofs_in_node, nofs;
block_t start_bidx;
- /*
- * It makes sure that free segments are able to write
- * all the dirty node pages before CP after this CP.
- * So let's check the space of dirty node pages.
- */
- if (should_do_checkpoint(sbi)) {
- mutex_lock(&sbi->cp_mutex);
- block_operations(sbi);
- err = GC_BLOCKED;
- goto stop;
- }
+ /* stop BG_GC if there is not enough free sections. */
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0))
+ return;
- err = check_valid_map(sbi, segno, off);
- if (err == GC_NEXT)
+ if (check_valid_map(sbi, segno, off) == 0)
continue;
if (phase == 0) {
}
/* Get an inode by ino with checking validity */
- err = check_dnode(sbi, entry, &dni, start_addr + off, &nofs);
- if (err == GC_NEXT)
+ if (check_dnode(sbi, entry, &dni, start_addr + off, &nofs) == 0)
continue;
if (phase == 1) {
ofs_in_node = le16_to_cpu(entry->ofs_in_node);
if (phase == 2) {
- inode = f2fs_iget_nowait(sb, dni.ino);
+ inode = f2fs_iget(sb, dni.ino);
if (IS_ERR(inode))
continue;
}
if (++phase < 4)
goto next_step;
- err = GC_DONE;
-stop:
- if (gc_type == FG_GC)
+
+ if (gc_type == FG_GC) {
f2fs_submit_bio(sbi, DATA, true);
- return err;
+
+ /*
+ * In the case of FG_GC, it'd be better to reclaim this victim
+ * completely.
+ */
+ if (get_valid_blocks(sbi, segno, 1) != 0) {
+ phase = 2;
+ goto next_step;
+ }
+ }
}
static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
return ret;
}
-static int do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
+static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
struct list_head *ilist, int gc_type)
{
struct page *sum_page;
struct f2fs_summary_block *sum;
- int ret = GC_DONE;
/* read segment summary of victim */
sum_page = get_sum_page(sbi, segno);
if (IS_ERR(sum_page))
- return GC_ERROR;
+ return;
- /*
- * CP needs to lock sum_page. In this time, we don't need
- * to lock this page, because this summary page is not gone anywhere.
- * Also, this page is not gonna be updated before GC is done.
- */
- unlock_page(sum_page);
sum = page_address(sum_page);
switch (GET_SUM_TYPE((&sum->footer))) {
case SUM_TYPE_NODE:
- ret = gc_node_segment(sbi, sum->entries, segno, gc_type);
+ gc_node_segment(sbi, sum->entries, segno, gc_type);
break;
case SUM_TYPE_DATA:
- ret = gc_data_segment(sbi, sum->entries, ilist, segno, gc_type);
+ gc_data_segment(sbi, sum->entries, ilist, segno, gc_type);
break;
}
stat_inc_seg_count(sbi, GET_SUM_TYPE((&sum->footer)));
stat_inc_call_count(sbi->stat_info);
- f2fs_put_page(sum_page, 0);
- return ret;
+ f2fs_put_page(sum_page, 1);
}
int f2fs_gc(struct f2fs_sb_info *sbi)
struct list_head ilist;
unsigned int segno, i;
int gc_type = BG_GC;
- int gc_status = GC_NONE;
+ int nfree = 0;
+ int ret = -1;
INIT_LIST_HEAD(&ilist);
gc_more:
if (!(sbi->sb->s_flags & MS_ACTIVE))
goto stop;
- if (has_not_enough_free_secs(sbi))
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {
gc_type = FG_GC;
+ write_checkpoint(sbi, false);
+ }
if (!__get_victim(sbi, &segno, gc_type, NO_CHECK_TYPE))
goto stop;
+ ret = 0;
- for (i = 0; i < sbi->segs_per_sec; i++) {
- /*
- * do_garbage_collect will give us three gc_status:
- * GC_ERROR, GC_DONE, and GC_BLOCKED.
- * If GC is finished uncleanly, we have to return
- * the victim to dirty segment list.
- */
- gc_status = do_garbage_collect(sbi, segno + i, &ilist, gc_type);
- if (gc_status != GC_DONE)
- break;
- }
- if (has_not_enough_free_secs(sbi)) {
- write_checkpoint(sbi, (gc_status == GC_BLOCKED), false);
- if (has_not_enough_free_secs(sbi))
- goto gc_more;
+ for (i = 0; i < sbi->segs_per_sec; i++)
+ do_garbage_collect(sbi, segno + i, &ilist, gc_type);
+
+ if (gc_type == FG_GC) {
+ sbi->cur_victim_sec = NULL_SEGNO;
+ nfree++;
+ WARN_ON(get_valid_blocks(sbi, segno, sbi->segs_per_sec));
}
+
+ if (has_not_enough_free_secs(sbi, nfree))
+ goto gc_more;
+
+ if (gc_type == FG_GC)
+ write_checkpoint(sbi, false);
stop:
mutex_unlock(&sbi->gc_mutex);
put_gc_inode(&ilist);
- return gc_status;
+ return ret;
}
void build_gc_manager(struct f2fs_sb_info *sbi)
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff