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erofs: fix broken illustration in documentation

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Illustration was broken after ReST conversion by accident.
(checked by 'make SPHINXDIRS="filesystems" htmldocs')

Link: https://lore.kernel.org/r/20210510162506.28637-1-xiang@kernel.org
Fixes: e66d8631dd ("docs: filesystems: convert erofs.txt to ReST")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Gao Xiang <xiang@kernel.org>
This commit is contained in:
Gao Xiang 2021-05-11 00:25:05 +08:00
parent 6efb943b86
commit 1b55767dfd
1 changed files with 59 additions and 60 deletions
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25
Documentation/filesystems/erofs.rst
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@ -175,7 +175,7 @@ may not. All metadatas can be now observed in two different spaces (views):
Each share xattr can also be directly found by the following formula:
xattr offset = xattr_blkaddr * block_size + 4 * xattr_id
::
::
|-> aligned by 4 bytes
+ xattr_blkaddr blocks |-> aligned with 4 bytes
@ -204,7 +204,6 @@ algorithm (could refer to the related source code).
\ | * could have
\ | trailing '\0'
\________________________| nameoff0
Directory block
Note that apart from the offset of the first filename, nameoff0 also indicates
@ -216,21 +215,21 @@ Compression
Currently, EROFS supports 4KB fixed-sized output transparent file compression,
as illustrated below::
|---- Variant-Length Extent ----|-------- VLE --------|----- VLE -----
|<- variable-sized extent ->|<- VLE ->|
clusterofs clusterofs clusterofs
| | | logical data
_________v_______________________________v_____________________v_______________
... | . | | . | | . | ...
____|____.________|_____________|________.____|_____________|__.__________|____
|-> cluster <-|-> cluster <-|-> cluster <-|-> cluster <-|-> cluster <-|
size size size size size
| | |
_________v_________________________________v_______________________v________
... | . | | . | | . ...
____|____._________|______________|________.___ _|______________|__.________
|-> lcluster <-|-> lcluster <-|-> lcluster <-|-> lcluster <-|
size size size size . .
. . . .
. . . .
. . . .
_______._____________._____________._____________._____________________
... | | | | ... physical data
_______|_____________|_____________|_____________|_____________________
|-> cluster <-|-> cluster <-|-> cluster <-|
_______.______________.______________.______________._________________
... | | | | ...
_______|______________|______________|______________|_________________
|-> pcluster <-|-> pcluster <-|-> pcluster <-|
size size size
Currently each on-disk physical cluster can contain 4KB (un)compressed data