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Add some file operations, such as ubifs_lookup, ubifs_mkdir, etc., this
is a preparation for recovering disconnected files or root dir in fsck.
File writing operations are based on the journal subsystem, generated
dirty data depends on a new commit in subsequent steps to update disk
content.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 4/12 step of rebuilding. Filter out invalid files and drop
them, for example:
1. File has no inode node or inode nlink is zero
2. Nonconsistent file type between inode node and dentry nodes
3. File has no dentry nodes(excepts '/')
4. Encrypted file has no xattr information
5. Non regular file has data nodes
6. Directory/xattr file has more than one dentries
7. Xattr file has no host inode, or the host inode is a xattr
...
Valid xattr file will be inserted into corresponding host file's subtree.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt journal.c in libubifs, compared with linux kernel implementations:
1. Remove all ubifs_jnl_XXX functions. Only keep the basic space
reservation code, fsck will add new functions for journaling
operations without using linux in-memory inode/dentry.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Import UBIFS libs from linux kernel. Next patches will replace ubifs
related source code with implementation of linux kernel, which makes
userspace implementation be same with linux kernel, then fsck.ubifs
can resuse the code.
Notice: lpt.c is modified with [1] applied. ubifs.h and orphan.c are
modified with [2] applied, journal.c is modified with [3] reverted(
because fsck runs in a single thread, so waitqueue is not needed to
be implemented in userspace.).
[1] https://lore.kernel.org/linux-mtd/20231228014112.2836317-13-chengzhihao1@huawei.com/
[2] https://lore.kernel.org/linux-mtd/20240410073751.2522830-1-chengzhihao1@huawei.com/
[3] https://lore.kernel.org/linux-mtd/20240122063103.359501-1-chengzhihao1@huawei.com/
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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