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From:   Zhang Yi <yi.zhang@huawei.com>
To:     <linux-ext4@vger.kernel.org>
CC:     <tytso@mit.edu>, <adilger.kernel@dilger.ca>, <jack@suse.cz>,
        <yi.zhang@huawei.com>, <yukuai3@huawei.com>
Subject: [PATCH 09/12] ext4: add xattr block I/O fault injection
Date:   Tue, 8 Nov 2022 22:46:14 +0800
Message-ID: <20221108144617.4159381-10-yi.zhang@huawei.com>
In-Reply-To: <20221108144617.4159381-1-yi.zhang@huawei.com>
References: <20221108144617.4159381-1-yi.zhang@huawei.com>
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Add I/O fault injection when reading xattr block, we can specify the
inode to inject. ext4_xattr_get_block() will return -EIO immediately
instead of submitting I/O.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/ext4.h  | 2 ++
 fs/ext4/sysfs.c | 1 +
 fs/ext4/xattr.c | 4 ++++
 3 files changed, 7 insertions(+)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index aaa3a29cd0e7..94894daef595 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1524,6 +1524,7 @@ enum ext4_fault_bits {
 	EXT4_FAULT_INODE_EIO,		/* inode */
 	EXT4_FAULT_EXTENT_EIO,		/* extent block */
 	EXT4_FAULT_DIRBLOCK_EIO,	/* directory block */
+	EXT4_FAULT_XATTR_EIO,		/* xattr block */
 	EXT4_FAULT_MAX
 };
 
@@ -1628,6 +1629,7 @@ EXT4_FAULT_GRP_FN(BBITMAP_EIO, block_bitmap_io, -EIO)
 EXT4_FAULT_INODE_FN(INODE_EIO, inode_io, -EIO)
 EXT4_FAULT_INODE_PBLOCK_FN(EXTENT_EIO, extent_io, -EIO)
 EXT4_FAULT_INODE_LBLOCK_FN(DIRBLOCK_EIO, dirblock_io, -EIO)
+EXT4_FAULT_INODE_FN(XATTR_EIO, xattr_io, -EIO)
 
 /*
  * fourth extended-fs super-block data in memory
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 0329205a9958..f7f8882037a5 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -583,6 +583,7 @@ char *ext4_fault_names[EXT4_FAULT_MAX] = {
 	"inode_eio",			/* EXT4_FAULT_INODE_EIO */
 	"extent_block_eio",		/* EXT4_FAULT_EXTENT_EIO */
 	"dir_block_eio",		/* EXT4_FAULT_DIRBLOCK_EIO */
+	"xattr_block_eio",		/* EXT4_FAULT_XATTR_EIO */
 };
 
 static int ext4_fault_available_show(struct seq_file *m, void *v)
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 39c80565c65d..3a066c1ddd5c 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2231,6 +2231,10 @@ static struct buffer_head *ext4_xattr_get_block(struct inode *inode)
 	if (!EXT4_I(inode)->i_file_acl)
 		return NULL;
 
+	error = ext4_fault_xattr_io(inode->i_sb, inode->i_ino);
+	if (error)
+		return ERR_PTR(error);
+
 	ea_idebug(inode, "reading block %llu",
 		  (unsigned long long)EXT4_I(inode)->i_file_acl);
 	bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
-- 
2.31.1