f2fs: fix to align to section for fallocate() on pinned file

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 <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

3 files changed, 36 insertions, 19 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index fe9e0d4d3920..ac57072d73cf 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3389,7 +3389,7 @@ 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 1863944f4073..bd5a77091d23 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 b5a40a39a03f..f2b22da8c134 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2899,7 +2899,8 @@ 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;
@@ -2907,10 +2908,22 @@ 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;
@@ -2918,10 +2931,15 @@ 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);
 }
 
@@ -2931,7 +2949,7 @@ 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);
 }