From 16e712005049e8fd795408f055efcd58ec719db0 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Fri, 5 Mar 2021 17:56:01 +0800 Subject: [PATCH] f2fs: fix to align to section for fallocate() on pinned file [ Upstream commit e1175f02291141bbd924fc578299305fcde35855 ] Now, fallocate() on a pinned file only allocates blocks which aligns to segment rather than section, so GC may try to migrate pinned file's block, and after several times of failure, pinned file's block could be migrated to other place, however user won't be aware of such condition, and then old obsolete block address may be readed/written incorrectly. To avoid such condition, let's try to allocate pinned file's blocks with section alignment. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/f2fs.h | 2 +- fs/f2fs/file.c | 19 +++++++++---------- fs/f2fs/segment.c | 34 ++++++++++++++++++++++++++-------- 3 files changed, 36 insertions(+), 19 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index cccdfb1a40ab1..45a83f8c9e87a 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -3383,7 +3383,7 @@ void f2fs_get_new_segment(struct f2fs_sb_info *sbi, unsigned int *newseg, bool new_sec, int dir); void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type, unsigned int start, unsigned int end); -void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type); +void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type); void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi); int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range); bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi, diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 1863944f40738..bd5a77091d237 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1646,27 +1646,26 @@ static int expand_inode_data(struct inode *inode, loff_t offset, return 0; if (f2fs_is_pinned_file(inode)) { - block_t len = (map.m_len >> sbi->log_blocks_per_seg) << - sbi->log_blocks_per_seg; + block_t sec_blks = BLKS_PER_SEC(sbi); + block_t sec_len = roundup(map.m_len, sec_blks); block_t done = 0; - if (map.m_len % sbi->blocks_per_seg) - len += sbi->blocks_per_seg; - - map.m_len = sbi->blocks_per_seg; + map.m_len = sec_blks; next_alloc: if (has_not_enough_free_secs(sbi, 0, GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) { down_write(&sbi->gc_lock); err = f2fs_gc(sbi, true, false, false, NULL_SEGNO); - if (err && err != -ENODATA && err != -EAGAIN) + if (err && err != -ENODATA && err != -EAGAIN) { + map.m_len = done; goto out_err; + } } down_write(&sbi->pin_sem); f2fs_lock_op(sbi); - f2fs_allocate_new_segment(sbi, CURSEG_COLD_DATA_PINNED); + f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED); f2fs_unlock_op(sbi); map.m_seg_type = CURSEG_COLD_DATA_PINNED; @@ -1675,9 +1674,9 @@ next_alloc: up_write(&sbi->pin_sem); done += map.m_len; - len -= map.m_len; + sec_len -= map.m_len; map.m_lblk += map.m_len; - if (!err && len) + if (!err && sec_len) goto next_alloc; map.m_len = done; diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index dcba4ac3dd2bc..91708460f584a 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2893,7 +2893,8 @@ unlock: up_read(&SM_I(sbi)->curseg_lock); } -static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type) +static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type, + bool new_sec) { struct curseg_info *curseg = CURSEG_I(sbi, type); unsigned int old_segno; @@ -2901,10 +2902,22 @@ static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type) if (!curseg->inited) goto alloc; - if (!curseg->next_blkoff && - !get_valid_blocks(sbi, curseg->segno, false) && - !get_ckpt_valid_blocks(sbi, curseg->segno)) - return; + if (curseg->next_blkoff || + get_valid_blocks(sbi, curseg->segno, new_sec)) + goto alloc; + + if (new_sec) { + unsigned int segno = START_SEGNO(curseg->segno); + int i; + + for (i = 0; i < sbi->segs_per_sec; i++, segno++) { + if (get_ckpt_valid_blocks(sbi, segno)) + goto alloc; + } + } else { + if (!get_ckpt_valid_blocks(sbi, curseg->segno)) + return; + } alloc: old_segno = curseg->segno; @@ -2912,10 +2925,15 @@ alloc: locate_dirty_segment(sbi, old_segno); } -void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type) +static void __allocate_new_section(struct f2fs_sb_info *sbi, int type) +{ + __allocate_new_segment(sbi, type, true); +} + +void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type) { down_write(&SIT_I(sbi)->sentry_lock); - __allocate_new_segment(sbi, type); + __allocate_new_section(sbi, type); up_write(&SIT_I(sbi)->sentry_lock); } @@ -2925,7 +2943,7 @@ void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi) down_write(&SIT_I(sbi)->sentry_lock); for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) - __allocate_new_segment(sbi, i); + __allocate_new_segment(sbi, i, false); up_write(&SIT_I(sbi)->sentry_lock); } -- 2.47.3