diff options
Diffstat (limited to 'fs/nilfs2/sufile.c')
| -rw-r--r-- | fs/nilfs2/sufile.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c index 07013f58dfe9..98e68677f045 100644 --- a/fs/nilfs2/sufile.c +++ b/fs/nilfs2/sufile.c @@ -258,6 +258,35 @@ void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, nilfs_mdt_mark_dirty(sufile); } +void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, + struct buffer_head *header_bh, + struct buffer_head *su_bh) +{ + struct nilfs_segment_usage *su; + void *kaddr; + int clean, dirty; + + kaddr = kmap_atomic(su_bh->b_page, KM_USER0); + su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); + if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) && + su->su_nblocks == cpu_to_le32(0)) { + kunmap_atomic(kaddr, KM_USER0); + return; + } + clean = nilfs_segment_usage_clean(su); + dirty = nilfs_segment_usage_dirty(su); + + /* make the segment garbage */ + su->su_lastmod = cpu_to_le64(0); + su->su_nblocks = cpu_to_le32(0); + su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY); + kunmap_atomic(kaddr, KM_USER0); + + nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1); + nilfs_mdt_mark_buffer_dirty(su_bh); + nilfs_mdt_mark_dirty(sufile); +} + void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) |