[Ocfs2-devel] [PATCH] ocfs2: fix ocfs2 read inode data panic in ocfs2_iget

[Shuning Zhang]

In some cases, the function ocfs2_iget read the data of inode, which has
been deleted for some reason. That will make the system panic. So We
should judge whether this inode has been deleted, and tell the caller
that the inode is a bad inode.

[283465.542049] OCFS2: ERROR (device sdp): ocfs2_validate_inode_block:
Invalid dinode #580640: OCFS2_VALID_FL not set

[283465.545490] Kernel panic - not syncing: OCFS2: (device sdp): panic forced
after error

[283465.546889] CPU: 5 PID: 12416 Comm: nfsd Tainted: G        W
4.1.12-124.18.6.el6uek.bug28762940v3.x86_64 #2
[283465.548382] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
Desktop Reference Platform, BIOS 6.00 09/21/2015
[283465.549657]  0000000000000000 ffff8800a56fb7b8 ffffffff816e839c
ffffffffa0514758
[283465.550392]  000000000008dc20 ffff8800a56fb838 ffffffff816e62d3
0000000000000008
[283465.551056]  ffff880000000010 ffff8800a56fb848 ffff8800a56fb7e8
ffff88005df9f000
[283465.551710] Call Trace:
[283465.552516]  [<ffffffff816e839c>] dump_stack+0x63/0x81
[283465.553291]  [<ffffffff816e62d3>] panic+0xcb/0x21b
[283465.554037]  [<ffffffffa04e66b0>] ocfs2_handle_error+0xf0/0xf0 [ocfs2]
[283465.554882]  [<ffffffffa04e7737>] __ocfs2_error+0x67/0x70 [ocfs2]
[283465.555768]  [<ffffffffa049c0f9>] ocfs2_validate_inode_block+0x229/0x230
[ocfs2]
[283465.556683]  [<ffffffffa047bcbc>] ocfs2_read_blocks+0x46c/0x7b0 [ocfs2]
[283465.557408]  [<ffffffffa049bed0>] ? ocfs2_inode_cache_io_unlock+0x20/0x20
[ocfs2]
[283465.557973]  [<ffffffffa049f0eb>] ocfs2_read_inode_block_full+0x3b/0x60
[ocfs2]
[283465.558525]  [<ffffffffa049f5ba>] ocfs2_iget+0x4aa/0x880 [ocfs2]
[283465.559082]  [<ffffffffa049146e>] ocfs2_get_parent+0x9e/0x220 [ocfs2]
[283465.559622]  [<ffffffff81297c05>] reconnect_path+0xb5/0x300
[283465.560156]  [<ffffffff81297f46>] exportfs_decode_fh+0xf6/0x2b0
[283465.560708]  [<ffffffffa062faf0>] ? nfsd_proc_getattr+0xa0/0xa0 [nfsd]
[283465.561262]  [<ffffffff810a8196>] ? prepare_creds+0x26/0x110
[283465.561932]  [<ffffffffa0630860>] fh_verify+0x350/0x660 [nfsd]
[283465.562862]  [<ffffffffa0637804>] ? nfsd_cache_lookup+0x44/0x630 [nfsd]
[283465.563697]  [<ffffffffa063a8b9>] nfsd3_proc_getattr+0x69/0xf0 [nfsd]
[283465.564510]  [<ffffffffa062cf60>] nfsd_dispatch+0xe0/0x290 [nfsd]
[283465.565358]  [<ffffffffa05eb892>] ? svc_tcp_adjust_wspace+0x12/0x30
[sunrpc]
[283465.566272]  [<ffffffffa05ea652>] svc_process_common+0x412/0x6a0 [sunrpc]
[283465.567155]  [<ffffffffa05eaa03>] svc_process+0x123/0x210 [sunrpc]
[283465.568020]  [<ffffffffa062c90f>] nfsd+0xff/0x170 [nfsd]
[283465.568962]  [<ffffffffa062c810>] ? nfsd_destroy+0x80/0x80 [nfsd]
[283465.570112]  [<ffffffff810a622b>] kthread+0xcb/0xf0
[283465.571099]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
[283465.572114]  [<ffffffff816f11b8>] ret_from_fork+0x58/0x90
[283465.573156]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
---
 fs/ocfs2/inode.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index b254416..a7f8160 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -513,6 +513,16 @@ static int ocfs2_read_locked_inode(struct inode *inode,
 	status = -EINVAL;
 	fe = (struct ocfs2_dinode *) bh->b_data;
 
+	/* 
+	 * In some cases, this inode has been deleted, but the data of 
+	 * inode is read directly. So We should judge whether this inode 
+	 * has been deleted.
+	 * */
+	if (unlikely(fe->i_dtime != 0)) {
+		mlog(ML_NOTICE, "The inode %llu has been deleted\n",
+		     le64_to_cpu(fe->i_blkno));
+	        goto bail;
+	}
 	/*
 	 * This is a code bug. Right now the caller needs to
 	 * understand whether it is asking for a system file inode or
@@ -1331,6 +1341,18 @@ int ocfs2_validate_inode_block(struct super_block *sb,
 
 	BUG_ON(!buffer_uptodate(bh));
 
+	/* 
+	 * In some cases, this inode has been deleted, but the data of 
+	 * inode is read directly. This is not a data corruption.So 
+	 * We should judge whether this inode has been deleted.
+	 * */
+	if (unlikely(di->i_dtime != 0)) {
+		rc = -EINVAL;
+		mlog(ML_NOTICE, "The inode %llu has been deleted\n",
+		     le64_to_cpu(di->i_blkno));
+	        goto bail;
+	}
+
 	/*
 	 * If the ecc fails, we return the error but otherwise
 	 * leave the filesystem running.  We know any error is
-- 
1.7.1