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| author | Tristan Ye <tristan.ye@oracle.com> | 2011-05-12 20:47:07 +0800 |
|---|---|---|
| committer | Joel Becker <jlbec@evilplan.org> | 2011-05-13 11:26:20 -0700 |
| commit | 9a790ba1ec02bbae0933e7ebd576c0bc329e9796 (patch) | |
| tree | 2c9de49e67ed2be4e6db04eae6b9d4062e9dd950 | |
| parent | 5d44670facd3205212f8fe89eb422e3b5f309612 (diff) | |
| download | linux-9a790ba1ec02bbae0933e7ebd576c0bc329e9796.tar.gz linux-9a790ba1ec02bbae0933e7ebd576c0bc329e9796.tar.bz2 linux-9a790ba1ec02bbae0933e7ebd576c0bc329e9796.zip | |
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: Tristan Ye <tristan.ye@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
| -rw-r--r-- | fs/ocfs2/file.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 41565ae52856..89659d6dc206 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -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) + |