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-rw-r--r--fs/ext4/block_validity.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index fac90f3fba80..8efb2f0a3447 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -246,3 +246,24 @@ int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk,
return 1;
}
+int ext4_check_blockref(const char *function, unsigned int line,
+ struct inode *inode, __le32 *p, unsigned int max)
+{
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+ __le32 *bref = p;
+ unsigned int blk;
+
+ while (bref < p+max) {
+ blk = le32_to_cpu(*bref++);
+ if (blk &&
+ unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb),
+ blk, 1))) {
+ es->s_last_error_block = cpu_to_le64(blk);
+ ext4_error_inode(inode, function, line, blk,
+ "invalid block");
+ return -EIO;
+ }
+ }
+ return 0;
+}
+