016e41f629
Additional urgent fixes on top of 5.0-rc1-4.9: f2fs: don't access node/meta inode mapping after iput f2fs: wait on atomic writes to count F2FS_CP_WB_DATA * origin/upstream-f2fs-stable-linux-4.9.y: f2fs: don't access node/meta inode mapping after iput f2fs: wait on atomic writes to count F2FS_CP_WB_DATA f2fs: sanity check of xattr entry size f2fs: fix use-after-free issue when accessing sbi->stat_info f2fs: check PageWriteback flag for ordered case f2fs: fix validation of the block count in sanity_check_raw_super f2fs: fix missing unlock(sbi->gc_mutex) f2fs: clean up structure extent_node f2fs: fix block address for __check_sit_bitmap f2fs: fix sbi->extent_list corruption issue f2fs: clean up checkpoint flow f2fs: flush stale issued discard candidates f2fs: correct wrong spelling, issing_* f2fs: use kvmalloc, if kmalloc is failed f2fs: remove redundant comment of unused wio_mutex f2fs: fix to reorder set_page_dirty and wait_on_page_writeback f2fs: clear PG_writeback if IPU failed f2fs: add an ioctl() to explicitly trigger fsck later f2fs: avoid frequent costly fsck triggers f2fs: fix m_may_create to make OPU DIO write correctly f2fs: fix to update new block address correctly for OPU f2fs: adjust trace print in f2fs_get_victim() to cover all paths f2fs: fix to allow node segment for GC by ioctl path f2fs: make "f2fs_fault_name[]" const char * f2fs: read page index before freeing f2fs: fix wrong return value of f2fs_acl_create f2fs: avoid build warn of fall_through f2fs: fix race between write_checkpoint and write_begin f2fs: check memory boundary by insane namelen f2fs: only flush the single temp bio cache which owns the target page f2fs: fix out-place-update DIO write f2fs: fix to be aware discard/preflush/dio command in is_idle() f2fs: add to account direct IO f2fs: move dir data flush to write checkpoint process f2fs: change segment to section in f2fs_ioc_gc_range f2fs: export migration_granularity sysfs entry f2fs: support subsectional garbage collection f2fs: introduce __is_large_section() for cleanup f2fs: clean up f2fs_sb_has_##feature_name f2fs: remove codes of unused wio_mutex f2fs: fix count of seg_freed to make sec_freed correct f2fs: fix to account preflush command for noflush_merge mode f2fs: avoid GC causing encrypted file corrupted Change-Id: I7bfeb214db53112b8a0b24a52c0cde81c315f51a Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* f2fs shrinker support
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* the basic infra was copied from fs/ubifs/shrinker.c
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*
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* Copyright (c) 2015 Motorola Mobility
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* Copyright (c) 2015 Jaegeuk Kim <jaegeuk@kernel.org>
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include "f2fs.h"
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#include "node.h"
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static LIST_HEAD(f2fs_list);
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static DEFINE_SPINLOCK(f2fs_list_lock);
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static unsigned int shrinker_run_no;
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static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)
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{
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long count = NM_I(sbi)->nat_cnt - NM_I(sbi)->dirty_nat_cnt;
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return count > 0 ? count : 0;
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}
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static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
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{
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long count = NM_I(sbi)->nid_cnt[FREE_NID] - MAX_FREE_NIDS;
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return count > 0 ? count : 0;
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}
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static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)
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{
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return atomic_read(&sbi->total_zombie_tree) +
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atomic_read(&sbi->total_ext_node);
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}
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unsigned long f2fs_shrink_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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struct f2fs_sb_info *sbi;
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struct list_head *p;
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unsigned long count = 0;
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spin_lock(&f2fs_list_lock);
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p = f2fs_list.next;
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while (p != &f2fs_list) {
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sbi = list_entry(p, struct f2fs_sb_info, s_list);
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/* stop f2fs_put_super */
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if (!mutex_trylock(&sbi->umount_mutex)) {
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p = p->next;
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continue;
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}
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spin_unlock(&f2fs_list_lock);
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/* count extent cache entries */
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count += __count_extent_cache(sbi);
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/* shrink clean nat cache entries */
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count += __count_nat_entries(sbi);
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/* count free nids cache entries */
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count += __count_free_nids(sbi);
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spin_lock(&f2fs_list_lock);
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p = p->next;
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mutex_unlock(&sbi->umount_mutex);
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}
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spin_unlock(&f2fs_list_lock);
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return count;
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}
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unsigned long f2fs_shrink_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long nr = sc->nr_to_scan;
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struct f2fs_sb_info *sbi;
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struct list_head *p;
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unsigned int run_no;
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unsigned long freed = 0;
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spin_lock(&f2fs_list_lock);
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do {
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run_no = ++shrinker_run_no;
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} while (run_no == 0);
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p = f2fs_list.next;
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while (p != &f2fs_list) {
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sbi = list_entry(p, struct f2fs_sb_info, s_list);
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if (sbi->shrinker_run_no == run_no)
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break;
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/* stop f2fs_put_super */
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if (!mutex_trylock(&sbi->umount_mutex)) {
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p = p->next;
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continue;
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}
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spin_unlock(&f2fs_list_lock);
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sbi->shrinker_run_no = run_no;
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/* shrink extent cache entries */
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freed += f2fs_shrink_extent_tree(sbi, nr >> 1);
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/* shrink clean nat cache entries */
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if (freed < nr)
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freed += f2fs_try_to_free_nats(sbi, nr - freed);
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/* shrink free nids cache entries */
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if (freed < nr)
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freed += f2fs_try_to_free_nids(sbi, nr - freed);
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spin_lock(&f2fs_list_lock);
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p = p->next;
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list_move_tail(&sbi->s_list, &f2fs_list);
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mutex_unlock(&sbi->umount_mutex);
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if (freed >= nr)
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break;
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}
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spin_unlock(&f2fs_list_lock);
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return freed;
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}
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void f2fs_join_shrinker(struct f2fs_sb_info *sbi)
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{
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spin_lock(&f2fs_list_lock);
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list_add_tail(&sbi->s_list, &f2fs_list);
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spin_unlock(&f2fs_list_lock);
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}
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void f2fs_leave_shrinker(struct f2fs_sb_info *sbi)
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{
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f2fs_shrink_extent_tree(sbi, __count_extent_cache(sbi));
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spin_lock(&f2fs_list_lock);
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list_del_init(&sbi->s_list);
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spin_unlock(&f2fs_list_lock);
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}
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