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457b1e353c
When ext4 encryption support was first added, ZERO_RANGE was disallowed,
supposedly because test failures (e.g. ext4/001) were seen when enabling
it, and at the time there wasn't enough time/interest to debug it.
However, there's actually no reason why ZERO_RANGE can't work on
encrypted files. And it fact it *does* work now. Whole blocks in the
zeroed range are converted to unwritten extents, as usual; encryption
makes no difference for that part. Partial blocks are zeroed in the
pagecache and then ->writepages() encrypts those blocks as usual.
ext4_block_zero_page_range() handles reading and decrypting the block if
needed before actually doing the pagecache write.
Also, f2fs has always supported ZERO_RANGE on encrypted files.
As far as I can tell, the reason that ext4/001 was failing in v4.1 was
actually because of one of the bugs fixed by commit
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|---|---|---|
| .. | ||
| caching | ||
| cifs | ||
| configfs | ||
| ext4 | ||
| nfs | ||
| 9p.txt | ||
| adfs.txt | ||
| affs.txt | ||
| afs.txt | ||
| api-summary.rst | ||
| autofs-mount-control.txt | ||
| autofs.rst | ||
| automount-support.txt | ||
| befs.txt | ||
| bfs.txt | ||
| btrfs.txt | ||
| ceph.txt | ||
| coda.txt | ||
| cramfs.txt | ||
| dax.txt | ||
| debugfs.txt | ||
| devpts.txt | ||
| directory-locking.rst | ||
| dlmfs.txt | ||
| dnotify.txt | ||
| ecryptfs.txt | ||
| efivarfs.txt | ||
| erofs.txt | ||
| ext2.txt | ||
| ext3.txt | ||
| f2fs.txt | ||
| fiemap.txt | ||
| files.txt | ||
| fscrypt.rst | ||
| fsverity.rst | ||
| fuse-io.txt | ||
| fuse.txt | ||
| gfs2-glocks.txt | ||
| gfs2-uevents.txt | ||
| gfs2.txt | ||
| hfs.txt | ||
| hfsplus.txt | ||
| hpfs.txt | ||
| index.rst | ||
| inotify.txt | ||
| isofs.txt | ||
| journalling.rst | ||
| locking.rst | ||
| locks.txt | ||
| mandatory-locking.txt | ||
| mount_api.txt | ||
| nilfs2.txt | ||
| ntfs.txt | ||
| ocfs2-online-filecheck.txt | ||
| ocfs2.txt | ||
| omfs.txt | ||
| orangefs.txt | ||
| overlayfs.rst | ||
| path-lookup.rst | ||
| path-lookup.txt | ||
| porting.rst | ||
| proc.txt | ||
| qnx6.txt | ||
| quota.txt | ||
| ramfs-rootfs-initramfs.txt | ||
| relay.txt | ||
| romfs.txt | ||
| seq_file.txt | ||
| sharedsubtree.txt | ||
| splice.rst | ||
| spufs.txt | ||
| squashfs.txt | ||
| sysfs-pci.txt | ||
| sysfs-tagging.txt | ||
| sysfs.txt | ||
| sysv-fs.txt | ||
| tmpfs.txt | ||
| ubifs-authentication.rst | ||
| ubifs.txt | ||
| udf.txt | ||
| vfat.txt | ||
| vfs.rst | ||
| virtiofs.rst | ||
| xfs-delayed-logging-design.txt | ||
| xfs-self-describing-metadata.txt | ||