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Renaming a file within a single mounted file system (using the rename system call) should be an atomic operation, but renaming within a union mount can require changes to multiple of the union's constituent directories. A possible solution is to disallow rename in such situations and require implementations to copy-and-delete instead. [2]
Note that, in the above example, /mnt referred to the directory (the "mount point") over which a given file system is mounted. Naming such directories /mnt is a popular convention but is by no means necessary. A "file system" can be thought of as an independent tree that is logically regarded as a unit; its root is "mounted" atop a directory of ...
Reparse points provide a way to extend the NTFS filesystem. A reparse point contains a reparse tag and data that are interpreted by a filesystem filter driver identified by the tag. Microsoft includes several default tags including NTFS symbolic links, directory junction points, volume mount points and Unix domain sockets.
In computing, rename refers to the altering of a name of a file. This can be done manually by using a shell command such as ren or mv , or by using batch renaming software that can automate the renaming process.
Symbolic links are reparse points which operate similarly to Junction Points, or symbolic links in Unix or Linux, and accept relative paths and paths to files as well as directories. Support for directory and UNC paths were added in NTFS 3.1. NTFS volume mount points; All NTFS links are intended to be transparent to applications.
For directories, when a directory's sticky bit is set, the filesystem treats the files in such directories in a special way so only the file's owner, the directory's owner, or root user can rename or delete the file. Without the sticky bit set, any user with write and execute permissions for the directory can rename or delete contained files ...
The mount command instructs the operating system that a file system is ready to use, and associates it with a particular point in the overall file system hierarchy (its mount point) and sets options relating to its access. Mounting makes file systems, files, directories, devices and special files available for use and available to the user.
Unionfs is a filesystem service for Linux, FreeBSD and NetBSD which implements a union mount for other file systems.It allows files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system.