linux-kernel - [PATCH V8 01/11] fs/xfs: Remove unnecessary initialization of i

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200415064523.2244712-2-ira.weiny@intel.com>
Date:   Tue, 14 Apr 2020 23:45:13 -0700
From:   ira.weiny@...el.com
To:     linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Dave Chinner <dchinner@...hat.com>, Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jeff Moyer <jmoyer@...hat.com>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH V8 01/11] fs/xfs: Remove unnecessary initialization of i_rwsem

From: Ira Weiny <ira.weiny@...el.com>

An earlier call of xfs_reinit_inode() from xfs_iget_cache_hit() already
handles initialization of i_rwsem.

Doing so again is unneeded.

Reviewed-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes from V4:
	Update commit message to make it clear the xfs_iget_cache_hit()
	is actually doing the initialization via xfs_reinit_inode()

New for V4:

NOTE: This was found while ensuring the new i_aops_sem was properly
handled.  It seems like this is a layering violation so I think it is
worth cleaning up so as to not confuse others.
---
 fs/xfs/xfs_icache.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 8dc2e5414276..836a1f09be03 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -419,6 +419,7 @@ xfs_iget_cache_hit(
 		spin_unlock(&ip->i_flags_lock);
 		rcu_read_unlock();
 
+		ASSERT(!rwsem_is_locked(&inode->i_rwsem));
 		error = xfs_reinit_inode(mp, inode);
 		if (error) {
 			bool wake;
@@ -452,9 +453,6 @@ xfs_iget_cache_hit(
 		ip->i_sick = 0;
 		ip->i_checked = 0;
 
-		ASSERT(!rwsem_is_locked(&inode->i_rwsem));
-		init_rwsem(&inode->i_rwsem);
-
 		spin_unlock(&ip->i_flags_lock);
 		spin_unlock(&pag->pag_ici_lock);
 	} else {
-- 
2.25.1