Copyright (c) 1994 Jan-Simon Pendry The Regents of the University of California. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and t...
NAMEundelete - attempt to recover a deleted file
SYNOPSISIn unistd.h Ft int Fn undelete const char *path
DESCRIPTIONThe Fn undelete system call attempts to recover the deleted file named by Fa path . Currently, this works only when the named object is a whiteout in a union file system. The system call removes the whiteout causing any objects in a lower layer of the union stack to become visible once more.
Eventually, the Fn undelete functionality may be expanded to other file systems able to recover deleted files such as the log-structured file system.
RETURN VALUESRv -std undelete
ERRORSThe Fn undelete succeeds unless:
- Bq Er ENOTDIR
- A component of the path prefix is not a directory.
- Bq Er ENAMETOOLONG
- A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
- Bq Er EEXIST
- The path does not reference a whiteout.
- Bq Er ENOENT
- The named whiteout does not exist.
- Bq Er EACCES
- Search permission is denied for a component of the path prefix.
- Bq Er EACCES
- Write permission is denied on the directory containing the name to be undeleted.
- Bq Er ELOOP
- Too many symbolic links were encountered in translating the pathname.
- Bq Er EPERM
- The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID.
- Bq Er EINVAL
- The last component of the path is `..'
- Bq Er EIO
- An I/O error occurred while updating the directory entry.
- Bq Er EROFS
- The name resides on a read-only file system.
- Bq Er EFAULT
- The Fa path argument points outside the process's allocated address space.