From e254d1afac83fd441e4051771b3d8f5eaf49fd3a Mon Sep 17 00:00:00 2001 From: Eryu Guan Date: Thu, 10 May 2018 11:55:31 -0400 Subject: [PATCH] ext4: use raw i_version value for ea_inode Currently, creating large xattr (e.g. 2k) in ea_inode would cause ea_inode refcount corruption, e.g. Pass 4: Checking reference counts Extended attribute inode 13 ref count is 0, should be 1. Fix? no This is because that we save the lower 32bit of refcount in inode->i_version and store it in raw_inode->i_disk_version on disk. But since commit ee73f9a52a34 ("ext4: convert to new i_version API"), we load/store modified i_disk_version from/to disk instead of raw value, which causes on-disk ea_inode refcount corruption. Fix it by loading/storing raw i_version/i_disk_version, because it's a self-managed value in this case. Fixes: ee73f9a52a34 ("ext4: convert to new i_version API") Cc: Tahsin Erdogan Signed-off-by: Eryu Guan Signed-off-by: Theodore Ts'o --- fs/ext4/inode.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 1e50c5e..0eb64e8 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4724,6 +4724,26 @@ int ext4_get_projid(struct inode *inode, kprojid_t *projid) return 0; } +/* + * ext4 has self-managed i_version for ea inodes, it stores the lower 32bit of + * refcount in i_version, so use raw values if inode has EXT4_EA_INODE_FL flag + * set. + */ +static inline void ext4_inode_set_iversion_queried(struct inode *inode, u64 val) +{ + if (unlikely(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) + inode_set_iversion_raw(inode, val); + else + inode_set_iversion_queried(inode, val); +} +static inline u64 ext4_inode_peek_iversion(const struct inode *inode) +{ + if (unlikely(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) + return inode_peek_iversion_raw(inode); + else + return inode_peek_iversion(inode); +} + struct inode *ext4_iget(struct super_block *sb, unsigned long ino) { struct ext4_iloc iloc; @@ -4910,7 +4930,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) ivers |= (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; } - inode_set_iversion_queried(inode, ivers); + ext4_inode_set_iversion_queried(inode, ivers); } ret = 0; @@ -5196,7 +5216,7 @@ static int ext4_do_update_inode(handle_t *handle, } if (likely(!test_opt2(inode->i_sb, HURD_COMPAT))) { - u64 ivers = inode_peek_iversion(inode); + u64 ivers = ext4_inode_peek_iversion(inode); raw_inode->i_disk_version = cpu_to_le32(ivers); if (ei->i_extra_isize) { -- 2.7.4