Changes between Version 3 and Version 4 of TBR/UserManual/RTEMS_File_System


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Timestamp:
Feb 23, 2010, 6:10:50 AM (10 years ago)
Author:
ChrisJohns
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  • TBR/UserManual/RTEMS_File_System

    v3 v4  
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    12 The RFS file system consists of superblock at the start followed by a series of groups. A group is a group of blocks.
     12The RFS file system consists of superblock at the start followed by a series of groups. A group is a group of blocks and exists to keep the bitmaps in a group to a file block size plus to also help localise blocks and inodes.
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    40 The block bitmap contains a single bit for every block in a group. The default format is to allocate the size of a group based on the number of bits that fit into a single block. For example a block of 1024 bytes has 8,192 bits therefore a group can have 8192 blocks including the block bitmap block. The inode bitmap has a bit for ever inode in the group. An inode is the information about a node on the disk. A node is the data that links the elements of the disk together to create directories, files, and nodes. The number of inodes in a group is format configuration parameter. The default is use 1% of the disk's blocks for inode data. Again with a 1024 byte block size there are 18 inodes per block and 1448 inodes per group.
     40The block bitmap contains a single bit for every block in a group. The default format is to allocate the size of a group based on the number of bits that fit into a single block. For example a block of 1024 bytes has 8,192 bits therefore a group can have 8192 blocks including the block bitmap block. The inode bitmap has a bit for ever inode in the group. An inode is the information about a node on the disk. A node is the data that links the elements of the disk together to create directories, files, and nodes as well as hold times and flags. The number of inodes in a group is a format configuration parameter. The default is use 1% of the disk's blocks for inode data. Again with a 1024 byte block size there are 18 inodes per block and 1448 inodes per group. Inodes do not span block boundaries.
    4141= Using the RFS =
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