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authorGao Xiang <hsiangkao@linux.alibaba.com>2022-02-04 03:02:03 +0800
committerGao Xiang <hsiangkao@linux.alibaba.com>2022-02-04 12:37:12 +0800
commit24331050a3e6afcd4451409831dd9ae8085a42f6 (patch)
treedf3e493ae7115f10582f4bfa903da01e32f7f81c /fs/coda
parent7865827c432bf9885ee26e5767697c3d9e21a82c (diff)
erofs: fix small compressed files inlining
Prior to ztailpacking feature, it's enough that each lcluster has two pclusters at most, and the last pcluster should be turned into an uncompressed pcluster when necessary. For example, _________________________________________________ |_ pcluster n-2 _|_ pcluster n-1 _|____ EOFed ____| which should be converted into: _________________________________________________ |_ pcluster n-2 _|_ pcluster n-1 (uncompressed)' _| That is fine since either pcluster n-1 or (uncompressed)' takes one physical block. However, after ztailpacking was supported, the game is changed since the last pcluster can be inlined now. And such case above is quite common for inlining small files. Therefore, in order to inline more effectively, special EOF lclusters are now supported which can have three parts at most, as illustrated below: _________________________________________________ |_ pcluster n-2 _|_ pcluster n-1 _|____ EOFed ____| ^ i_size Actually similar code exists in Yue Hu's original patchset [1], but I removed this part on purpose. After evaluating more real cases with small files, I've changed my mind. [1] https://lore.kernel.org/r/20211215094449.15162-1-huyue2@yulong.com Link: https://lore.kernel.org/r/20220203190203.30794-1-xiang@kernel.org Fixes: ab92184ff8f1 ("erofs: add on-disk compressed tail-packing inline support") Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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