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Diffstat (limited to 'Documentation/filesystems/ext4/ondisk/bitmaps.rst')
| -rw-r--r-- | Documentation/filesystems/ext4/ondisk/bitmaps.rst | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/Documentation/filesystems/ext4/ondisk/bitmaps.rst b/Documentation/filesystems/ext4/ondisk/bitmaps.rst deleted file mode 100644 index c7546dbc197a..000000000000 --- a/Documentation/filesystems/ext4/ondisk/bitmaps.rst +++ /dev/null @@ -1,28 +0,0 @@ -.. SPDX-License-Identifier: GPL-2.0 - -Block and inode Bitmaps ------------------------ - -The data block bitmap tracks the usage of data blocks within the block -group. - -The inode bitmap records which entries in the inode table are in use. - -As with most bitmaps, one bit represents the usage status of one data -block or inode table entry. This implies a block group size of 8 \* -number\_of\_bytes\_in\_a\_logical\_block. - -NOTE: If ``BLOCK_UNINIT`` is set for a given block group, various parts -of the kernel and e2fsprogs code pretends that the block bitmap contains -zeros (i.e. all blocks in the group are free). However, it is not -necessarily the case that no blocks are in use -- if ``meta_bg`` is set, -the bitmaps and group descriptor live inside the group. Unfortunately, -ext2fs\_test\_block\_bitmap2() will return '0' for those locations, -which produces confusing debugfs output. - -Inode Table ------------ -Inode tables are statically allocated at mkfs time. Each block group -descriptor points to the start of the table, and the superblock records -the number of inodes per group. See the section on inodes for more -information. |
