diff options
| author | Chao Yu <yuchao0@huawei.com> | 2020-03-18 11:22:59 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2020-05-08 16:55:56 +0300 |
| commit | 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef (patch) | |
| tree | b6ed34cd7bde862ad9061b811749a7abded16439 /fs/f2fs/compress.c | |
| parent | b5f4684b5f5fe6ea3c0d57acf5acdf8e8fbfe503 (diff) | |
| download | linux-3265d3db1f16395cfc6b8ea9b31b4001d98d05ef.tar.xz | |
f2fs: support partial truncation on compressed inode
Supports to truncate compressed/normal cluster partially on compressed
inode.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/compress.c')
| -rw-r--r-- | fs/f2fs/compress.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index 26b071afe48a..d6283e351c95 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -954,6 +954,55 @@ bool f2fs_compress_write_end(struct inode *inode, void *fsdata, return first_index; } +int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock) +{ + void *fsdata = NULL; + struct page *pagep; + int log_cluster_size = F2FS_I(inode)->i_log_cluster_size; + pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) << + log_cluster_size; + int err; + + err = f2fs_is_compressed_cluster(inode, start_idx); + if (err < 0) + return err; + + /* truncate normal cluster */ + if (!err) + return f2fs_do_truncate_blocks(inode, from, lock); + + /* truncate compressed cluster */ + err = f2fs_prepare_compress_overwrite(inode, &pagep, + start_idx, &fsdata); + + /* should not be a normal cluster */ + f2fs_bug_on(F2FS_I_SB(inode), err == 0); + + if (err <= 0) + return err; + + if (err > 0) { + struct page **rpages = fsdata; + int cluster_size = F2FS_I(inode)->i_cluster_size; + int i; + + for (i = cluster_size - 1; i >= 0; i--) { + loff_t start = rpages[i]->index << PAGE_SHIFT; + + if (from <= start) { + zero_user_segment(rpages[i], 0, PAGE_SIZE); + } else { + zero_user_segment(rpages[i], from - start, + PAGE_SIZE); + break; + } + } + + f2fs_compress_write_end(inode, fsdata, start_idx, true); + } + return 0; +} + static int f2fs_write_compressed_pages(struct compress_ctx *cc, int *submitted, struct writeback_control *wbc, |