From 346fe752c431bcef5d05614263a4b4a0cfe88e10 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Mon, 13 Mar 2017 20:10:41 +0800 Subject: [PATCH] f2fs: cover update_free_nid_bitmap with nid_list_lock free_nid_bitmap and free_nid_count in update_free_nid_bitmap should be updated atomically, use nid_list_lock cover them to avoid race in concurrent scenario. Signed-off-by: Chao Yu Reviewed-by: Kinglong Mee Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 1 - fs/f2fs/node.c | 27 +++++++++++---------------- 2 files changed, 11 insertions(+), 17 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 148c8b1d506c..6c00a787c342 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -565,7 +565,6 @@ struct f2fs_nm_info { unsigned char (*free_nid_bitmap)[NAT_ENTRY_BITMAP_SIZE]; unsigned char *nat_block_bitmap; unsigned short *free_nid_count; /* free nid count of NAT block */ - spinlock_t free_nid_lock; /* protect updating of nid count */ /* for checkpoint */ char *nat_bitmap; /* NAT bitmap pointer */ diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 11df8ab32478..3bfffd744f87 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1815,7 +1815,7 @@ static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid) } static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid, - bool set, bool build, bool locked) + bool set, bool build) { struct f2fs_nm_info *nm_i = NM_I(sbi); unsigned int nat_ofs = NAT_BLOCK_OFFSET(nid); @@ -1829,14 +1829,10 @@ static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid, else __clear_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs]); - if (!locked) - spin_lock(&nm_i->free_nid_lock); if (set) nm_i->free_nid_count[nat_ofs]++; else if (!build) nm_i->free_nid_count[nat_ofs]--; - if (!locked) - spin_unlock(&nm_i->free_nid_lock); } static void scan_nat_page(struct f2fs_sb_info *sbi, @@ -1865,7 +1861,9 @@ static void scan_nat_page(struct f2fs_sb_info *sbi, f2fs_bug_on(sbi, blk_addr == NEW_ADDR); if (blk_addr == NULL_ADDR) freed = add_free_nid(sbi, start_nid, true); - update_free_nid_bitmap(sbi, start_nid, freed, true, false); + spin_lock(&NM_I(sbi)->nid_list_lock); + update_free_nid_bitmap(sbi, start_nid, freed, true); + spin_unlock(&NM_I(sbi)->nid_list_lock); } } @@ -2020,7 +2018,7 @@ retry: __insert_nid_to_list(sbi, i, ALLOC_NID_LIST, false); nm_i->available_nids--; - update_free_nid_bitmap(sbi, *nid, false, false, false); + update_free_nid_bitmap(sbi, *nid, false, false); spin_unlock(&nm_i->nid_list_lock); return true; @@ -2076,7 +2074,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid) nm_i->available_nids++; - update_free_nid_bitmap(sbi, nid, true, false, false); + update_free_nid_bitmap(sbi, nid, true, false); spin_unlock(&nm_i->nid_list_lock); @@ -2406,11 +2404,11 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, add_free_nid(sbi, nid, false); spin_lock(&NM_I(sbi)->nid_list_lock); NM_I(sbi)->available_nids++; - update_free_nid_bitmap(sbi, nid, true, false, false); + update_free_nid_bitmap(sbi, nid, true, false); spin_unlock(&NM_I(sbi)->nid_list_lock); } else { spin_lock(&NM_I(sbi)->nid_list_lock); - update_free_nid_bitmap(sbi, nid, false, false, false); + update_free_nid_bitmap(sbi, nid, false, false); spin_unlock(&NM_I(sbi)->nid_list_lock); } } @@ -2535,10 +2533,10 @@ inline void load_free_nid_bitmap(struct f2fs_sb_info *sbi) nid = i * NAT_ENTRY_PER_BLOCK; last_nid = (i + 1) * NAT_ENTRY_PER_BLOCK; - spin_lock(&nm_i->free_nid_lock); + spin_lock(&NM_I(sbi)->nid_list_lock); for (; nid < last_nid; nid++) - update_free_nid_bitmap(sbi, nid, true, true, true); - spin_unlock(&nm_i->free_nid_lock); + update_free_nid_bitmap(sbi, nid, true, true); + spin_unlock(&NM_I(sbi)->nid_list_lock); } for (i = 0; i < nm_i->nat_blocks; i++) { @@ -2629,9 +2627,6 @@ static int init_free_nid_cache(struct f2fs_sb_info *sbi) sizeof(unsigned short), GFP_KERNEL); if (!nm_i->free_nid_count) return -ENOMEM; - - spin_lock_init(&nm_i->free_nid_lock); - return 0; }