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authorJingbo Xu <jefflexu@linux.alibaba.com>2023-03-13 14:53:09 +0100
committerGao Xiang <hsiangkao@linux.alibaba.com>2023-04-16 19:15:45 +0200
commitd3c4bdcc756e60b95365c66ff58844ce75d1c8f8 (patch)
tree5f2bc78141eb55b6ee468b903472af891b938a33 /Documentation/filesystems
parenterofs: avoid hardcoded blocksize for subpage block support (diff)
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erofs: set block size to the on-disk block size
Set the block size to that specified in on-disk superblock. Also remove the hard constraint of PAGE_SIZE block size for the uncompressed device backend. This constraint is temporarily remained for compressed device and fscache backend, as there is more work needed to handle the condition where the block size is not equal to PAGE_SIZE. It is worth noting that the on-disk block size is read prior to erofs_superblock_csum_verify(), as the read block size is needed in the latter. Besides, later we are going to make erofs refer to tar data blobs (which is 512-byte aligned) for OCI containers, where the block size is 512 bytes. In this case, the 512-byte block size may not be adequate for a directory to contain enough dirents. To fix this, we are also going to introduce directory block size independent on the block size. Due to we have already supported block size smaller than PAGE_SIZE now, disable all these images with such separated directory block size until we supported this feature later. Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Yue Hu <huyue2@coolpad.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230313135309.75269-3-jefflexu@linux.alibaba.com [ Gao Xiang: update documentation. ] Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/erofs.rst4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index a43aacf1494e..4654ee57c1d5 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -40,8 +40,8 @@ Here are the main features of EROFS:
- Support multiple devices to refer to external blobs, which can be used
for container images;
- - 4KiB block size and 32-bit block addresses for each device, therefore
- 16TiB address space at most for now;
+ - 32-bit block addresses for each device, therefore 16TiB address space at
+ most with 4KiB block size for now;
- Two inode layouts for different requirements: