diff options
Diffstat (limited to 'fs/f2fs/compress.c')
| -rw-r--r-- | fs/f2fs/compress.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index 455561826c7d..7dbfd6965b97 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -1666,6 +1666,30 @@ void f2fs_put_page_dic(struct page *page) f2fs_put_dic(dic); } +/* + * check whether cluster blocks are contiguous, and add extent cache entry + * only if cluster blocks are logically and physically contiguous. + */ +unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn) +{ + bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR; + int i = compressed ? 1 : 0; + block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page, + dn->ofs_in_node + i); + + for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) { + block_t blkaddr = data_blkaddr(dn->inode, dn->node_page, + dn->ofs_in_node + i); + + if (!__is_valid_data_blkaddr(blkaddr)) + break; + if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr) + return 0; + } + + return compressed ? i - 1 : i; +} + const struct address_space_operations f2fs_compress_aops = { .releasepage = f2fs_release_page, .invalidatepage = f2fs_invalidate_page, |