提交 9a790ba1 编写于 作者: T Tristan Ye 提交者: Joel Becker

ocfs2: skip existing hole when removing the last extent_rec in punching-hole codes.

In the case of removing a partial extent record which covers a hole, current
punching-hole logic will try to remove more than the length of whole extent
record, which leads to the failure of following assert(fs/ocfs2/alloc.c):

5507         BUG_ON(cpos < le32_to_cpu(rec->e_cpos) || trunc_range > rec_range);

This patch tries to skip existing hole at the last attempt of removing a partial
extent record, what's more, it also adds some necessary comments for better
understanding of punching-hole codes.
Signed-off-by: NTristan Ye <tristan.ye@oracle.com>
Signed-off-by: NJoel Becker <jlbec@evilplan.org>
上级 5d44670f
......@@ -1607,6 +1607,9 @@ static void ocfs2_calc_trunc_pos(struct inode *inode,
range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
/*
* remove an entire extent record.
*/
*trunc_cpos = le32_to_cpu(rec->e_cpos);
/*
* Skip holes if any.
......@@ -1617,7 +1620,16 @@ static void ocfs2_calc_trunc_pos(struct inode *inode,
*blkno = le64_to_cpu(rec->e_blkno);
*trunc_end = le32_to_cpu(rec->e_cpos);
} else if (range > trunc_start) {
/*
* remove a partial extent record, which means we're
* removing the last extent record.
*/
*trunc_cpos = trunc_start;
/*
* skip hole if any.
*/
if (range < *trunc_end)
*trunc_end = range;
*trunc_len = *trunc_end - trunc_start;
coff = trunc_start - le32_to_cpu(rec->e_cpos);
*blkno = le64_to_cpu(rec->e_blkno) +
......
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