From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/nilfs2/inode.c | 33 +++++++++++++++++++++++++++++++--
1 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/kernel/fs/nilfs2/inode.c b/kernel/fs/nilfs2/inode.c
index fb594ed..d144e08 100644
--- a/kernel/fs/nilfs2/inode.c
+++ b/kernel/fs/nilfs2/inode.c
@@ -921,6 +921,7 @@
struct nilfs_transaction_info ti;
struct super_block *sb = inode->i_sb;
struct nilfs_inode_info *ii = NILFS_I(inode);
+ struct the_nilfs *nilfs;
int ret;
if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
@@ -932,6 +933,23 @@
nilfs_transaction_begin(sb, &ti, 0); /* never fails */
truncate_inode_pages_final(&inode->i_data);
+
+ nilfs = sb->s_fs_info;
+ if (unlikely(sb_rdonly(sb) || !nilfs->ns_writer)) {
+ /*
+ * If this inode is about to be disposed after the file system
+ * has been degraded to read-only due to file system corruption
+ * or after the writer has been detached, do not make any
+ * changes that cause writes, just clear it.
+ * Do this check after read-locking ns_segctor_sem by
+ * nilfs_transaction_begin() in order to avoid a race with
+ * the writer detach operation.
+ */
+ clear_inode(inode);
+ nilfs_clear_inode(inode);
+ nilfs_transaction_abort(sb);
+ return;
+ }
/* TODO: some of the following operations may fail. */
nilfs_truncate_bmap(ii, 0);
@@ -1009,7 +1027,7 @@
int err;
spin_lock(&nilfs->ns_inode_lock);
- if (ii->i_bh == NULL) {
+ if (ii->i_bh == NULL || unlikely(!buffer_uptodate(ii->i_bh))) {
spin_unlock(&nilfs->ns_inode_lock);
err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
inode->i_ino, pbh);
@@ -1018,7 +1036,10 @@
spin_lock(&nilfs->ns_inode_lock);
if (ii->i_bh == NULL)
ii->i_bh = *pbh;
- else {
+ else if (unlikely(!buffer_uptodate(ii->i_bh))) {
+ __brelse(ii->i_bh);
+ ii->i_bh = *pbh;
+ } else {
brelse(*pbh);
*pbh = ii->i_bh;
}
@@ -1085,9 +1106,17 @@
int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
{
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct buffer_head *ibh;
int err;
+ /*
+ * Do not dirty inodes after the log writer has been detached
+ * and its nilfs_root struct has been freed.
+ */
+ if (unlikely(nilfs_purging(nilfs)))
+ return 0;
+
err = nilfs_load_inode_block(inode, &ibh);
if (unlikely(err)) {
nilfs_warn(inode->i_sb,
--
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