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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/blocks.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- Superblock struct was outdated, added the new fields which were part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/blocks.rst')
| -rw-r--r-- | Documentation/filesystems/ext4/blocks.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/filesystems/ext4/blocks.rst b/Documentation/filesystems/ext4/blocks.rst index 73d4dc0f7bda..bd722ecd92d6 100644 --- a/Documentation/filesystems/ext4/blocks.rst +++ b/Documentation/filesystems/ext4/blocks.rst @@ -10,7 +10,9 @@ block groups. Block size is specified at mkfs time and typically is 4KiB. You may experience mounting problems if block size is greater than page size (i.e. 64KiB blocks on a i386 which only has 4KiB memory pages). By default a filesystem can contain 2^32 blocks; if the '64bit' -feature is enabled, then a filesystem can have 2^64 blocks. +feature is enabled, then a filesystem can have 2^64 blocks. The location +of structures is stored in terms of the block number the structure lives +in and not the absolute offset on disk. For 32-bit filesystems, limits are as follows: |