Commit 4b2fecc8 authored by Jaegeuk Kim's avatar Jaegeuk Kim

f2fs: introduce FITRIM in f2fs_ioctl

This patch introduces FITRIM in f2fs_ioctl.
In this case, f2fs will issue small discards and prefree discards as many as
possible for the given area.
Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 75ab4cb8
......@@ -997,7 +997,7 @@ void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
mutex_lock(&sbi->cp_mutex);
if (!sbi->s_dirty)
if (!sbi->s_dirty && cpc->reason != CP_DISCARD)
goto out;
if (unlikely(f2fs_cp_error(sbi)))
goto out;
......@@ -1020,7 +1020,7 @@ void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
/* write cached NAT/SIT entries to NAT/SIT area */
flush_nat_entries(sbi);
flush_sit_entries(sbi);
flush_sit_entries(sbi, cpc);
/* unlock all the fs_lock[] in do_checkpoint() */
do_checkpoint(sbi, cpc);
......
......@@ -99,10 +99,15 @@ enum {
enum {
CP_UMOUNT,
CP_SYNC,
CP_DISCARD,
};
struct cp_control {
int reason;
__u64 trim_start;
__u64 trim_end;
__u64 trim_minlen;
__u64 trimmed;
};
/*
......@@ -1276,9 +1281,11 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *);
void invalidate_blocks(struct f2fs_sb_info *, block_t);
void refresh_sit_entry(struct f2fs_sb_info *, block_t, block_t);
void clear_prefree_segments(struct f2fs_sb_info *);
void release_discard_addrs(struct f2fs_sb_info *);
void discard_next_dnode(struct f2fs_sb_info *, block_t);
int npages_for_summary_flush(struct f2fs_sb_info *);
void allocate_new_segments(struct f2fs_sb_info *);
int f2fs_trim_fs(struct f2fs_sb_info *, struct fstrim_range *);
struct page *get_sum_page(struct f2fs_sb_info *, unsigned int);
void write_meta_page(struct f2fs_sb_info *, struct page *);
void write_node_page(struct f2fs_sb_info *, struct page *,
......@@ -1295,7 +1302,7 @@ void write_data_summaries(struct f2fs_sb_info *, block_t);
void write_node_summaries(struct f2fs_sb_info *, block_t);
int lookup_journal_in_cursum(struct f2fs_summary_block *,
int, unsigned int, int);
void flush_sit_entries(struct f2fs_sb_info *);
void flush_sit_entries(struct f2fs_sb_info *, struct cp_control *);
int build_segment_manager(struct f2fs_sb_info *);
void destroy_segment_manager(struct f2fs_sb_info *);
int __init create_segment_manager_caches(void);
......
......@@ -860,6 +860,35 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
mnt_drop_write_file(filp);
return ret;
}
case FITRIM:
{
struct super_block *sb = inode->i_sb;
struct request_queue *q = bdev_get_queue(sb->s_bdev);
struct fstrim_range range;
int ret = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
if (copy_from_user(&range, (struct fstrim_range __user *)arg,
sizeof(range)))
return -EFAULT;
range.minlen = max((unsigned int)range.minlen,
q->limits.discard_granularity);
ret = f2fs_trim_fs(F2FS_SB(sb), &range);
if (ret < 0)
return ret;
if (copy_to_user((struct fstrim_range __user *)arg, &range,
sizeof(range)))
return -EFAULT;
return 0;
}
default:
return -ENOTTY;
}
......
......@@ -386,22 +386,48 @@ void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
}
}
static void add_discard_addrs(struct f2fs_sb_info *sbi,
unsigned int segno, struct seg_entry *se)
static void add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
struct list_head *head = &SM_I(sbi)->discard_list;
struct discard_entry *new;
int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
int max_blocks = sbi->blocks_per_seg;
struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
unsigned long dmap[entries];
unsigned int start = 0, end = -1;
bool force = (cpc->reason == CP_DISCARD);
int i;
if (!test_opt(sbi, DISCARD))
if (!force && !test_opt(sbi, DISCARD))
return;
if (force && !se->valid_blocks) {
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
/*
* if this segment is registered in the prefree list, then
* we should skip adding a discard candidate, and let the
* checkpoint do that later.
*/
mutex_lock(&dirty_i->seglist_lock);
if (test_bit(cpc->trim_start, dirty_i->dirty_segmap[PRE])) {
mutex_unlock(&dirty_i->seglist_lock);
cpc->trimmed += sbi->blocks_per_seg;
return;
}
mutex_unlock(&dirty_i->seglist_lock);
new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
INIT_LIST_HEAD(&new->list);
new->blkaddr = START_BLOCK(sbi, cpc->trim_start);
new->len = sbi->blocks_per_seg;
list_add_tail(&new->list, head);
SM_I(sbi)->nr_discards += sbi->blocks_per_seg;
cpc->trimmed += sbi->blocks_per_seg;
return;
}
/* zero block will be discarded through the prefree list */
if (!se->valid_blocks || se->valid_blocks == max_blocks)
return;
......@@ -410,23 +436,39 @@ static void add_discard_addrs(struct f2fs_sb_info *sbi,
for (i = 0; i < entries; i++)
dmap[i] = (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
while (SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
while (force || SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
start = __find_rev_next_bit(dmap, max_blocks, end + 1);
if (start >= max_blocks)
break;
end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
if (end - start < cpc->trim_minlen)
continue;
new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
INIT_LIST_HEAD(&new->list);
new->blkaddr = START_BLOCK(sbi, segno) + start;
new->blkaddr = START_BLOCK(sbi, cpc->trim_start) + start;
new->len = end - start;
cpc->trimmed += end - start;
list_add_tail(&new->list, head);
SM_I(sbi)->nr_discards += end - start;
}
}
void release_discard_addrs(struct f2fs_sb_info *sbi)
{
struct list_head *head = &(SM_I(sbi)->discard_list);
struct discard_entry *entry, *this;
/* drop caches */
list_for_each_entry_safe(entry, this, head, list) {
list_del(&entry->list);
kmem_cache_free(discard_entry_slab, entry);
}
}
/*
* Should call clear_prefree_segments after checkpoint is done.
*/
......@@ -897,6 +939,41 @@ static const struct segment_allocation default_salloc_ops = {
.allocate_segment = allocate_segment_by_default,
};
int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
{
block_t start_addr = SM_I(sbi)->main_blkaddr;
__u64 start = range->start >> sbi->log_blocksize;
__u64 end = start + (range->len >> sbi->log_blocksize) - 1;
__u64 segment = 1 << (sbi->log_blocksize + sbi->log_blocks_per_seg);
unsigned int start_segno, end_segno;
struct cp_control cpc;
if (range->minlen > segment ||
start >= SM_I(sbi)->seg0_blkaddr + TOTAL_BLKS(sbi) ||
range->len < sbi->blocksize)
return -EINVAL;
if (end <= start_addr)
goto out;
/* start/end segment number in main_area */
start_segno = (start <= start_addr) ? 0 : GET_SEGNO(sbi, start);
end_segno = (end >= SM_I(sbi)->seg0_blkaddr + TOTAL_BLKS(sbi)) ?
TOTAL_SEGS(sbi) - 1 : GET_SEGNO(sbi, end);
cpc.reason = CP_DISCARD;
cpc.trim_start = start_segno;
cpc.trim_end = end_segno;
cpc.trim_minlen = range->minlen >> sbi->log_blocksize;
cpc.trimmed = 0;
/* do checkpoint to issue discard commands safely */
write_checkpoint(sbi, &cpc);
out:
range->len = cpc.trimmed << sbi->log_blocksize;
return 0;
}
static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
......@@ -1524,7 +1601,7 @@ static void remove_sits_in_journal(struct f2fs_sb_info *sbi)
* CP calls this function, which flushes SIT entries including sit_journal,
* and moves prefree segs to free segs.
*/
void flush_sit_entries(struct f2fs_sb_info *sbi)
void flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
struct sit_info *sit_i = SIT_I(sbi);
unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
......@@ -1534,6 +1611,7 @@ void flush_sit_entries(struct f2fs_sb_info *sbi)
struct list_head *head = &SM_I(sbi)->sit_entry_set;
unsigned long nsegs = TOTAL_SEGS(sbi);
bool to_journal = true;
struct seg_entry *se;
mutex_lock(&curseg->curseg_mutex);
mutex_lock(&sit_i->sentry_lock);
......@@ -1580,11 +1658,14 @@ void flush_sit_entries(struct f2fs_sb_info *sbi)
/* flush dirty sit entries in region of current sit set */
for_each_set_bit_from(segno, bitmap, end) {
int offset, sit_offset;
struct seg_entry *se = get_seg_entry(sbi, segno);
se = get_seg_entry(sbi, segno);
/* add discard candidates */
if (SM_I(sbi)->nr_discards < SM_I(sbi)->max_discards)
add_discard_addrs(sbi, segno, se);
if (SM_I(sbi)->nr_discards < SM_I(sbi)->max_discards) {
cpc->trim_start = segno;
add_discard_addrs(sbi, cpc);
}
if (to_journal) {
offset = lookup_journal_in_cursum(sum,
......@@ -1614,8 +1695,11 @@ void flush_sit_entries(struct f2fs_sb_info *sbi)
f2fs_bug_on(sbi, !list_empty(head));
f2fs_bug_on(sbi, sit_i->dirty_sentries);
out:
if (cpc->reason == CP_DISCARD) {
for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++)
add_discard_addrs(sbi, cpc);
}
mutex_unlock(&sit_i->sentry_lock);
mutex_unlock(&curseg->curseg_mutex);
......
......@@ -446,6 +446,7 @@ static void f2fs_put_super(struct super_block *sb)
* In addition, EIO will skip do checkpoint, we need this as well.
*/
release_dirty_inode(sbi);
release_discard_addrs(sbi);
iput(sbi->node_inode);
iput(sbi->meta_inode);
......
......@@ -72,7 +72,8 @@
#define show_cpreason(type) \
__print_symbolic(type, \
{ CP_UMOUNT, "Umount" }, \
{ CP_SYNC, "Sync" })
{ CP_SYNC, "Sync" }, \
{ CP_DISCARD, "Discard" })
struct victim_sel_policy;
......
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