diff options
Diffstat (limited to 'fs/f2fs/segment.c')
| -rw-r--r-- | fs/f2fs/segment.c | 104 |
1 files changed, 94 insertions, 10 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 3125a3d35245..fc87da189884 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -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); |