131 lines
3.5 KiB
Plaintext
131 lines
3.5 KiB
Plaintext
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Command: mkfs - make a file system
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Syntax: mkfs [-Ldot] [-i inodes] [-b blocks] special prototype
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Flags: -L Make a listing on standard output
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-d Use mod time of mkfs binary for all files
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-o Use a drive other than 0 or 1 (safety precaution)
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-t Do not test if file system fits on the medium
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-1 Make a version 1 file system (for backward compatibility)
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-i Number of i-nodes (files)
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-b Filesystem size
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Examples: mkfs /dev/fd1 proto # Make a file system on /dev/fd1
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mkfs -b 360 /dev/fd1 # Make empty 360 block file system
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mkfs /dev/fd1 360 # Alternate way to specify the size
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Mkfs builds a file system and copies specified files to it. The
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prototype file tells which directories and files to copy to it. If the
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prototype file cannot be opened, and its name is just a string of
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digits, an empty file system will be made with the specified number of
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blocks. A sample prototype file follows. The text following the # sign
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in the example below is comment. In real prototype files, comments are
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not allowed.
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boot # boot block file (ignored)
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360 63 # blocks and i-nodes
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d--755 1 1 # root directory
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bin d--755 2 1 # bin dir: mode (755), uid (2), gid (1)
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sh ---755 2 1 /user/bin/shell # shell has mode rwxr-xr-x
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mv -u-755 2 1 /user/bin/mv # u = SETUID bit
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login -ug755 2 1 /user/bin/login # SETUID and SETGID
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$ # end of /bin
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dev d--755 2 1 # special files: tty (char), fd0 (block)
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tty c--777 2 1 4 0 # uid=2, gid=1, major=4, minor=0
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fd0 b--644 2 1 2 0 360 # uid, gid, major, minor, blocks
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$ # end of /dev
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user d--755 12 1 # user dir: mode (755), uid (12), gid (1)
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ast d--755 12 1 # /user/ast
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$ # /user/ast is empty
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$ # end of /user
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$ # end of root directory
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The first entry on each line (except the first 3 and the $ lines, which
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terminate directories) is the name the file or directory will get on the
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new file system. Next comes its mode, with the first character being
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-dbc for regular files, directories, block special files and character
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special files, respectively. The next two characters are used to
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specify the SETUID and SETGID bits, as shown above. The last three
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characters of the mode are the rwx protection bits.
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Following the mode are the uid and gid. For special files, the
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major and minor devices are needed. The size in blocks must also be
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specified for block special files (the MINIX block size is 1K; this can
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only be changed by changing BLOCK_SIZE and then recompiling the
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operating system).
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The maximum size of a file system is 1 Gb for a version 2 file
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system, and 64 Mb for a version 1 file system. Alas the 8086 fsck runs
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out of memory on a V2 file system larger than 128 Mb, so for the 8086
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version of MINIX you have to limit yourself to file systems of that
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size.
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