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11 expanded into a ramfs filesystem; this document details the initramfs
18 thus a single .cpio.gz file.
33 ALGN(n) means padding with null bytes to an n-byte boundary
48 In human terms, the initramfs buffer contains a collection of
53 The cpio "TRAILER!!!" entry (cpio end-of-archive) is optional, but is
65 c_ino 8 bytes File inode number
66 c_mode 8 bytes File mode and permissions
67 c_uid 8 bytes File uid
68 c_gid 8 bytes File gid
69 c_nlink 8 bytes Number of links
70 c_mtime 8 bytes Modification time
71 c_filesize 8 bytes Size of data field
72 c_maj 8 bytes Major part of file device number
73 c_min 8 bytes Minor part of file device number
74 c_rmaj 8 bytes Major part of device node reference
75 c_rmin 8 bytes Minor part of device node reference
76 c_namesize 8 bytes Length of filename, including final \0
77 c_chksum 8 bytes Checksum of data field if c_magic is 070702;
86 The c_filesize should be zero for any file which is not a regular file
89 The c_chksum field contains a simple 32-bit unsigned sum of all the
91 clearly incorrect (a cyclic redundancy check is a different and
95 If the filename is "TRAILER!!!" this is actually an end-of-archive
96 marker; the c_filesize for an end-of-archive marker must be zero.
102 When a nondirectory with c_nlink > 1 is seen, the (c_maj,c_min,c_ino)
103 tuple is looked up in a tuple buffer. If not found, it is entered in
104 the tuple buffer and the entry is created as usual; if found, a hard
105 link rather than a second copy of the file is created. It is not
106 necessary (but permitted) to include a second copy of the file
110 the data-carrying instance of a file to occur anywhere in the sequence
111 (GNU cpio is reported to attach the data to the last instance of a
114 c_filesize must not be zero for a symlink.
116 When a "TRAILER!!!" end-of-archive marker is seen, the tuple buffer is
124 a) Separate the different file data sources with a "TRAILER!!!"
125 end-of-archive marker, or