linux.git/Documentation/filesystems/ext4, branch v5.7

Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

2019-09-21T20:37:39+00:00

Pull ext4 updates from Ted Ts'o:
 "Added new ext4 debugging ioctls to allow userspace to get information
  about the state of the extent status cache.

  Dropped workaround for pre-1970 dates which were encoded incorrectly
  in pre-4.4 kernels. Since both the kernel correctly generates, and
  e2fsck detects and fixes this issue for the past four years, it'e time
  to drop the workaround. (Also, it's not like files with dates in the
  distant past were all that common in the first place.)

  A lot of miscellaneous bug fixes and cleanups, including some ext4
  Documentation fixes. Also included are two minor bug fixes in
  fs/unicode"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (21 commits)
  unicode: make array 'token' static const, makes object smaller
  unicode: Move static keyword to the front of declarations
  ext4: add missing bigalloc documentation.
  ext4: fix kernel oops caused by spurious casefold flag
  ext4: fix integer overflow when calculating commit interval
  ext4: use percpu_counters for extent_status cache hits/misses
  ext4: fix potential use after free after remounting with noblock_validity
  jbd2: add missing tracepoint for reserved handle
  ext4: fix punch hole for inline_data file systems
  ext4: rework reserved cluster accounting when invalidating pages
  ext4: documentation fixes
  ext4: treat buffers with write errors as containing valid data
  ext4: fix warning inside ext4_convert_unwritten_extents_endio
  ext4: set error return correctly when ext4_htree_store_dirent fails
  ext4: drop legacy pre-1970 encoding workaround
  ext4: add new ioctl EXT4_IOC_GET_ES_CACHE
  ext4: add a new ioctl EXT4_IOC_GETSTATE
  ext4: add a new ioctl EXT4_IOC_CLEAR_ES_CACHE
  jbd2: flush_descriptor(): Do not decrease buffer head's ref count
  ext4: remove unnecessary error check
  ...

ext4: add missing bigalloc documentation.

2019-09-07T15:56:47+00:00

There was a broken link for bigalloc.  The page
https://ext4.wiki.kernel.org/index.php/Bigalloc was not migrated into
the current documentation sources.  This patch adds the contents of
that missing page into the section for Bigalloc itself.

Signed-off-by: Ayush Ranjan 
Link: https://lore.kernel.org/r/20190831154419.GA30357@fa19-cs241-404.cs.illinois.edu
Signed-off-by: Theodore Ts'o

ext4: documentation fixes

2019-08-23T03:18:33+00:00

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 
Signed-off-by: Theodore Ts'o 
Reviewed-by: Andreas Dilger

ext4: update on-disk format documentation for fs-verity

2019-08-13T02:33:51+00:00

Document the format of verity files on ext4, and the corresponding inode
and superblock flags.

Reviewed-by: Theodore Ts'o 
Signed-off-by: Eric Biggers

docs: filesystems: Remove uneeded .rst extension on toctables

2019-06-26T22:08:22+00:00

There's no need to use a .rst on Sphinx toc tables. As most of
the Documentation don't use, remove the remaing occurrences.

Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Jonathan Corbet

docs: promote the ext4 data structures book to top level

2018-10-05T23:20:08+00:00

Move the ext4 data structures book to Documentation/filesystems/ext4/
since the administrative information moved elsewhere.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Theodore Ts'o

docs: move ext4 administrative docs to admin-guide/

2018-10-05T23:11:59+00:00

Move the ext4 mount option and other administrative stuff to the Linux
administrator's guide.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Theodore Ts'o

docs: make ext4 readme tables readable

2018-10-03T02:45:25+00:00

The tables in the ext4 readme are not particularly space efficient in
the text or html outputs, and they're totally broken in the pdf output.
Convert them into titled paragraphs so that they render more nicely.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Theodore Ts'o

docs: fix ext4 documentation table formatting problems

2018-10-03T02:43:40+00:00

It turns out that the latex table formatters lay out table columns with
the exact proportional widths given in the table metadata, even if text
overflows outside the box.  This was not caught during the initial
import because the HTML renderers are smart enough to fudge the table.

Fix the table column width formatting problems in the data structures
and algorithms documentation so that we don't have squashed columns.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Theodore Ts'o

docs: fix up the obviously obsolete bits in the new ext4 documentation

2018-07-29T20:35:23+00:00

Signed-off-by: Theodore Ts'o