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14 expanded into a ramfs filesystem; this document details the format of
20 initramfs buffer is thus a single .cpio.gz file.
42 In human terms, the initramfs buffer contains a collection of
59 c_ino 8 bytes File inode number
60 c_mode 8 bytes File mode and permissions
61 c_uid 8 bytes File uid
62 c_gid 8 bytes File gid
63 c_nlink 8 bytes Number of links
64 c_mtime 8 bytes Modification time
65 c_filesize 8 bytes Size of data field
66 c_maj 8 bytes Major part of file device number
67 c_min 8 bytes Minor part of file device number
68 c_rmaj 8 bytes Major part of device node reference
69 c_rmin 8 bytes Minor part of device node reference
70 c_namesize 8 bytes Length of filename, including final \0
71 c_chksum 8 bytes Checksum of data field if c_magic is 070702;
78 The c_filesize should be zero for any file which is not a regular file
81 The c_chksum field contains a simple 32-bit unsigned sum of all the
83 clearly incorrect (a cyclic redundancy check is a different and
94 When a nondirectory with c_nlink > 1 is seen, the (c_maj,c_min,c_ino)
95 tuple is looked up in a tuple buffer. If not found, it is entered in
96 the tuple buffer and the entry is created as usual; if found, a hard
97 link rather than a second copy of the file is created. It is not
98 necessary (but permitted) to include a second copy of the file
102 the data-carrying instance of a file to occur anywhere in the sequence
103 (GNU cpio is reported to attach the data to the last instance of a
106 c_filesize must not be zero for a symlink.
108 When a "TRAILER!!!" end-of-archive marker is seen, the tuple buffer is
116 a) Separate the different file data sources with a "TRAILER!!!"