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| author | Ayush Ranjan <ayushr2@illinois.edu> | 2019-08-23 06:18:33 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-08-23 06:18:33 +0300 |
| commit | 219db95bbe796277c739cca17fe134f6c2ce6676 (patch) | |
| tree | ac53215637ce5b611c1f5233558c382f05fded13 /Documentation/filesystems/ext4/blockgroup.rst | |
| parent | 7963e5ac901251c7a3b36fe7c987623a3f309393 (diff) | |
| download | linux-219db95bbe796277c739cca17fe134f6c2ce6676.tar.xz | |
ext4: documentation fixes
This commit aims to fix the following issues in ext4 documentation:
- Flexible block group docs said that the aim was to group block
metadata together instead of block group metadata.
- The documentation consistly uses "location" instead of "block number".
It is easy to confuse location to be an absolute offset on disk. Added
a line to clarify all location values are in terms of block numbers.
- Dirent2 docs said that the rec_len field is shortened instead of the
name_len field.
- Typo in bg_checksum description.
- Inode size is 160 bytes now, and hence i_extra_isize is now 32.
- Cluster size formula was incorrect, it did not include the +10 to
s_log_cluster_size value.
- Typo: there were two s_wtime_hi in the superblock struct.
- Superblock struct was outdated, added the new fields which were part
of s_reserved earlier.
- Multiple mount protection seems to be implemented in fs/ext4/mmp.c.
Signed-off-by: Ayush Ranjan <ayushr2@illinois.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Diffstat (limited to 'Documentation/filesystems/ext4/blockgroup.rst')
| -rw-r--r-- | Documentation/filesystems/ext4/blockgroup.rst | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/filesystems/ext4/blockgroup.rst b/Documentation/filesystems/ext4/blockgroup.rst index baf888e4c06a..3da156633339 100644 --- a/Documentation/filesystems/ext4/blockgroup.rst +++ b/Documentation/filesystems/ext4/blockgroup.rst @@ -71,11 +71,11 @@ if the flex\_bg size is 4, then group 0 will contain (in order) the superblock, group descriptors, data block bitmaps for groups 0-3, inode bitmaps for groups 0-3, inode tables for groups 0-3, and the remaining space in group 0 is for file data. The effect of this is to group the -block metadata close together for faster loading, and to enable large -files to be continuous on disk. Backup copies of the superblock and -group descriptors are always at the beginning of block groups, even if -flex\_bg is enabled. The number of block groups that make up a flex\_bg -is given by 2 ^ ``sb.s_log_groups_per_flex``. +block group metadata close together for faster loading, and to enable +large files to be continuous on disk. Backup copies of the superblock +and group descriptors are always at the beginning of block groups, even +if flex\_bg is enabled. The number of block groups that make up a +flex\_bg is given by 2 ^ ``sb.s_log_groups_per_flex``. Meta Block Groups ----------------- |