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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/nilfs2/segment.c
..
..
@@ -435,6 +435,23 @@
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 	return 0;
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 }
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+/**
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+ * nilfs_segctor_zeropad_segsum - zero pad the rest of the segment summary area
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+ * @sci: segment constructor object
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+ *
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+ * nilfs_segctor_zeropad_segsum() zero-fills unallocated space at the end of
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+ * the current segment summary block.
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+ */
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+static void nilfs_segctor_zeropad_segsum(struct nilfs_sc_info *sci)
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+{
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+	struct nilfs_segsum_pointer *ssp;
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+
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+	ssp = sci->sc_blk_cnt > 0 ? &sci->sc_binfo_ptr : &sci->sc_finfo_ptr;
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+	if (ssp->offset < ssp->bh->b_size)
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+		memset(ssp->bh->b_data + ssp->offset, 0,
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+		       ssp->bh->b_size - ssp->offset);
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+}
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+
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 static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
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 {
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 	sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
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@@ -443,6 +460,7 @@
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 				* The current segment is filled up
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 				* (internal code)
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 				*/
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+	nilfs_segctor_zeropad_segsum(sci);
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 	sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
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 	return nilfs_segctor_reset_segment_buffer(sci);
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 }
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@@ -547,6 +565,7 @@
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 		goto retry;
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 	}
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 	if (unlikely(required)) {
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+		nilfs_segctor_zeropad_segsum(sci);
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 		err = nilfs_segbuf_extend_segsum(segbuf);
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 		if (unlikely(err))
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 			goto failed;
..
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@@ -711,6 +730,11 @@
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 		struct page *page = pvec.pages[i];
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 		lock_page(page);
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+		if (unlikely(page->mapping != mapping)) {
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+			/* Exclude pages removed from the address space */
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+			unlock_page(page);
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+			continue;
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+		}
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 		if (!page_has_buffers(page))
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 			create_empty_buffers(page, i_blocksize(inode), 0);
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 		unlock_page(page);
..
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@@ -965,10 +989,13 @@
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 	unsigned int isz, srsz;
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 	bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
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+
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+	lock_buffer(bh_sr);
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 	raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
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 	isz = nilfs->ns_inode_size;
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 	srsz = NILFS_SR_BYTES(isz);
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+	raw_sr->sr_sum = 0;  /* Ensure initialization within this update */
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 	raw_sr->sr_bytes = cpu_to_le16(srsz);
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 	raw_sr->sr_nongc_ctime
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 		= cpu_to_le64(nilfs_doing_gc() ?
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@@ -982,6 +1009,8 @@
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 	nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
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 				 NILFS_SR_SUFILE_OFFSET(isz), 1);
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 	memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
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+	set_buffer_uptodate(bh_sr);
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+	unlock_buffer(bh_sr);
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 }
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 static void nilfs_redirty_inodes(struct list_head *head)
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@@ -1536,6 +1565,7 @@
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 		nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
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 		sci->sc_stage = prev_stage;
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 	}
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+	nilfs_segctor_zeropad_segsum(sci);
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 	nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
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 	return 0;
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@@ -1763,6 +1793,7 @@
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 	list_for_each_entry(segbuf, logs, sb_list) {
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 		list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
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 				    b_assoc_buffers) {
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+			clear_buffer_uptodate(bh);
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 			if (bh->b_page != bd_page) {
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 				if (bd_page)
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 					end_page_writeback(bd_page);
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@@ -1774,6 +1805,7 @@
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 				    b_assoc_buffers) {
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 			clear_buffer_async_write(bh);
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 			if (bh == segbuf->sb_super_root) {
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+				clear_buffer_uptodate(bh);
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 				if (bh->b_page != bd_page) {
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 					end_page_writeback(bd_page);
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 					bd_page = bh->b_page;
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@@ -2023,6 +2055,9 @@
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 {
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 	struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
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 	int err;
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+
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+	if (sb_rdonly(sci->sc_super))
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+		return -EROFS;
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 	nilfs_sc_cstage_set(sci, NILFS_ST_INIT);
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 	sci->sc_cno = nilfs->ns_cno;
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@@ -2614,11 +2649,10 @@
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 	goto loop;
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  end_thread:
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-	spin_unlock(&sci->sc_state_lock);
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-
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 	/* end sync. */
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 	sci->sc_task = NULL;
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 	wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
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+	spin_unlock(&sci->sc_state_lock);
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 	return 0;
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 }
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@@ -2710,7 +2744,7 @@
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 		flush_work(&sci->sc_iput_work);
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-	} while (ret && retrycount-- > 0);
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+	} while (ret && ret != -EROFS && retrycount-- > 0);
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 }
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 /**
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@@ -2821,6 +2855,7 @@
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 		nilfs_segctor_destroy(nilfs->ns_writer);
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 		nilfs->ns_writer = NULL;
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 	}
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+	set_nilfs_purging(nilfs);
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 	/* Force to free the list of dirty files */
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 	spin_lock(&nilfs->ns_inode_lock);
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@@ -2833,4 +2868,5 @@
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 	up_write(&nilfs->ns_segctor_sem);
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 	nilfs_dispose_list(nilfs, &garbage_list, 1);
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+	clear_nilfs_purging(nilfs);
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 }