diff options
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index a197215ad52b..2f392982c597 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1646,6 +1646,199 @@ static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg) return 0; } +static int f2fs_defragment_range(struct f2fs_sb_info *sbi, + struct file *filp, + struct f2fs_defragment *range) +{ + struct inode *inode = file_inode(filp); + struct f2fs_map_blocks map; + struct extent_info ei; + pgoff_t pg_start, pg_end; + unsigned int blk_per_seg = 1 << sbi->log_blocks_per_seg; + unsigned int total = 0, sec_num; + unsigned int pages_per_sec = sbi->segs_per_sec * + (1 << sbi->log_blocks_per_seg); + block_t blk_end = 0; + bool fragmented = false; + int err; + + /* if in-place-update policy is enabled, don't waste time here */ + if (need_inplace_update(inode)) + return -EINVAL; + + pg_start = range->start >> PAGE_CACHE_SHIFT; + pg_end = (range->start + range->len) >> PAGE_CACHE_SHIFT; + + f2fs_balance_fs(sbi); + + mutex_lock(&inode->i_mutex); + + /* writeback all dirty pages in the range */ + err = filemap_write_and_wait_range(inode->i_mapping, range->start, + range->start + range->len); + if (err) + goto out; + + /* + * lookup mapping info in extent cache, skip defragmenting if physical + * block addresses are continuous. + */ + if (f2fs_lookup_extent_cache(inode, pg_start, &ei)) { + if (ei.fofs + ei.len >= pg_end) + goto out; + } + + map.m_lblk = pg_start; + map.m_len = pg_end - pg_start; + + /* + * lookup mapping info in dnode page cache, skip defragmenting if all + * physical block addresses are continuous even if there are hole(s) + * in logical blocks. + */ + while (map.m_lblk < pg_end) { + map.m_flags = 0; + err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_READ); + if (err) + goto out; + + if (!(map.m_flags & F2FS_MAP_FLAGS)) { + map.m_lblk++; + map.m_len--; + continue; + } + + if (blk_end && blk_end != map.m_pblk) { + fragmented = true; + break; + } + blk_end = map.m_pblk + map.m_len; + + map.m_lblk += map.m_len; + map.m_len = pg_end - map.m_lblk; + } + + if (!fragmented) + goto out; + + map.m_lblk = pg_start; + map.m_len = pg_end - pg_start; + + sec_num = (map.m_len + pages_per_sec - 1) / pages_per_sec; + + /* + * make sure there are enough free section for LFS allocation, this can + * avoid defragment running in SSR mode when free section are allocated + * intensively + */ + if (has_not_enough_free_secs(sbi, sec_num)) { + err = -EAGAIN; + goto out; + } + + while (map.m_lblk < pg_end) { + pgoff_t idx; + int cnt = 0; + +do_map: + map.m_flags = 0; + err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_READ); + if (err) + goto clear_out; + + if (!(map.m_flags & F2FS_MAP_FLAGS)) { + map.m_lblk++; + continue; + } + + set_inode_flag(F2FS_I(inode), FI_DO_DEFRAG); + + idx = map.m_lblk; + while (idx < map.m_lblk + map.m_len && cnt < blk_per_seg) { + struct page *page; + + page = get_lock_data_page(inode, idx, true); + if (IS_ERR(page)) { + err = PTR_ERR(page); + goto clear_out; + } + + set_page_dirty(page); + f2fs_put_page(page, 1); + + idx++; + cnt++; + total++; + } + + map.m_lblk = idx; + map.m_len = pg_end - idx; + + if (idx < pg_end && cnt < blk_per_seg) + goto do_map; + + clear_inode_flag(F2FS_I(inode), FI_DO_DEFRAG); + + err = filemap_fdatawrite(inode->i_mapping); + if (err) + goto out; + } +clear_out: + clear_inode_flag(F2FS_I(inode), FI_DO_DEFRAG); +out: + mutex_unlock(&inode->i_mutex); + if (!err) + range->len = (u64)total << PAGE_CACHE_SHIFT; + return err; +} + +static int f2fs_ioc_defragment(struct file *filp, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct f2fs_defragment range; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (!S_ISREG(inode->i_mode)) + return -EINVAL; + + err = mnt_want_write_file(filp); + if (err) + return err; + + if (f2fs_readonly(sbi->sb)) { + err = -EROFS; + goto out; + } + + if (copy_from_user(&range, (struct f2fs_defragment __user *)arg, + sizeof(range))) { + err = -EFAULT; + goto out; + } + + /* verify alignment of offset & size */ + if (range.start & (F2FS_BLKSIZE - 1) || + range.len & (F2FS_BLKSIZE - 1)) { + err = -EINVAL; + goto out; + } + + err = f2fs_defragment_range(sbi, filp, &range); + if (err < 0) + goto out; + + if (copy_to_user((struct f2fs_defragment __user *)arg, &range, + sizeof(range))) + err = -EFAULT; +out: + mnt_drop_write_file(filp); + return err; +} + long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { switch (cmd) { @@ -1679,6 +1872,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return f2fs_ioc_gc(filp, arg); case F2FS_IOC_WRITE_CHECKPOINT: return f2fs_ioc_write_checkpoint(filp, arg); + case F2FS_IOC_DEFRAGMENT: + return f2fs_ioc_defragment(filp, arg); default: return -ENOTTY; } |