From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jan Kara <jack@suse.cz>, Al Viro <viro@zeniv.linux.org.uk>,
Sasha Levin <sashal@kernel.org>,
brauner@kernel.org, jlayton@kernel.org,
reiserfs-devel@vger.kernel.org
Subject: [PATCH AUTOSEL 6.6 06/73] reiserfs: Avoid touching renamed directory if parent does not change
Date: Mon, 22 Jan 2024 10:01:20 -0500 [thread overview]
Message-ID: <20240122150432.992458-6-sashal@kernel.org> (raw)
In-Reply-To: <20240122150432.992458-1-sashal@kernel.org>
From: Jan Kara <jack@suse.cz>
[ Upstream commit 49db9b1b86a82448dfaf3fcfefcf678dee56c8ed ]
The VFS will not be locking moved directory if its parent does not
change. Change reiserfs rename code to avoid touching renamed directory
if its parent does not change as without locking that can corrupt the
filesystem.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/reiserfs/namei.c | 54 ++++++++++++++++++++++++---------------------
1 file changed, 29 insertions(+), 25 deletions(-)
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index 9c5704be2435..889341c6b8f0 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -1324,8 +1324,8 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
struct inode *old_inode, *new_dentry_inode;
struct reiserfs_transaction_handle th;
int jbegin_count;
- umode_t old_inode_mode;
unsigned long savelink = 1;
+ bool update_dir_parent = false;
if (flags & ~RENAME_NOREPLACE)
return -EINVAL;
@@ -1375,8 +1375,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
return -ENOENT;
}
- old_inode_mode = old_inode->i_mode;
- if (S_ISDIR(old_inode_mode)) {
+ if (S_ISDIR(old_inode->i_mode)) {
/*
* make sure that directory being renamed has correct ".."
* and that its new parent directory has not too many links
@@ -1389,24 +1388,28 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
}
}
- /*
- * directory is renamed, its parent directory will be changed,
- * so find ".." entry
- */
- dot_dot_de.de_gen_number_bit_string = NULL;
- retval =
- reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
+ if (old_dir != new_dir) {
+ /*
+ * directory is renamed, its parent directory will be
+ * changed, so find ".." entry
+ */
+ dot_dot_de.de_gen_number_bit_string = NULL;
+ retval =
+ reiserfs_find_entry(old_inode, "..", 2,
+ &dot_dot_entry_path,
&dot_dot_de);
- pathrelse(&dot_dot_entry_path);
- if (retval != NAME_FOUND) {
- reiserfs_write_unlock(old_dir->i_sb);
- return -EIO;
- }
+ pathrelse(&dot_dot_entry_path);
+ if (retval != NAME_FOUND) {
+ reiserfs_write_unlock(old_dir->i_sb);
+ return -EIO;
+ }
- /* inode number of .. must equal old_dir->i_ino */
- if (dot_dot_de.de_objectid != old_dir->i_ino) {
- reiserfs_write_unlock(old_dir->i_sb);
- return -EIO;
+ /* inode number of .. must equal old_dir->i_ino */
+ if (dot_dot_de.de_objectid != old_dir->i_ino) {
+ reiserfs_write_unlock(old_dir->i_sb);
+ return -EIO;
+ }
+ update_dir_parent = true;
}
}
@@ -1486,7 +1489,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);
- if (S_ISDIR(old_inode->i_mode)) {
+ if (update_dir_parent) {
if ((retval =
search_by_entry_key(new_dir->i_sb,
&dot_dot_de.de_entry_key,
@@ -1534,14 +1537,14 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
new_de.de_bh);
reiserfs_restore_prepared_buffer(old_inode->i_sb,
old_de.de_bh);
- if (S_ISDIR(old_inode_mode))
+ if (update_dir_parent)
reiserfs_restore_prepared_buffer(old_inode->
i_sb,
dot_dot_de.
de_bh);
continue;
}
- if (S_ISDIR(old_inode_mode)) {
+ if (update_dir_parent) {
if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
!entry_points_to_object("..", 2, &dot_dot_de,
old_dir)) {
@@ -1559,7 +1562,7 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
}
}
- RFALSE(S_ISDIR(old_inode_mode) &&
+ RFALSE(update_dir_parent &&
!buffer_journal_prepared(dot_dot_de.de_bh), "");
break;
@@ -1592,11 +1595,12 @@ static int reiserfs_rename(struct mnt_idmap *idmap,
savelink = new_dentry_inode->i_nlink;
}
- if (S_ISDIR(old_inode_mode)) {
+ if (update_dir_parent) {
/* adjust ".." of renamed directory */
set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
journal_mark_dirty(&th, dot_dot_de.de_bh);
-
+ }
+ if (S_ISDIR(old_inode->i_mode)) {
/*
* there (in new_dir) was no directory, so it got new link
* (".." of renamed directory)
--
2.43.0
parent reply other threads:[~2024-01-22 15:04 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20240122150432.992458-1-sashal@kernel.org>]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240122150432.992458-6-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=brauner@kernel.org \
--cc=jack@suse.cz \
--cc=jlayton@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=reiserfs-devel@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).