erofs: fix broken illustration in documentation
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
Родитель
6efb943b86
Коммит
1b55767dfd
|
|
@ -113,31 +113,31 @@ may not. All metadatas can be now observed in two different spaces (views):
|
|||
|
||||
::
|
||||
|
||||
|-> aligned with 8B
|
||||
|-> followed closely
|
||||
+ meta_blkaddr blocks |-> another slot
|
||||
_____________________________________________________________________
|
||||
| ... | inode | xattrs | extents | data inline | ... | inode ...
|
||||
|________|_______|(optional)|(optional)|__(optional)_|_____|__________
|
||||
|-> aligned with the inode slot size
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
.____________________________________________________|-> aligned with 4B
|
||||
| xattr_ibody_header | shared xattrs | inline xattrs |
|
||||
|____________________|_______________|_______________|
|
||||
|-> 12 bytes <-|->x * 4 bytes<-| .
|
||||
. . .
|
||||
. . .
|
||||
. . .
|
||||
._______________________________.______________________.
|
||||
| id | id | id | id | ... | id | ent | ... | ent| ... |
|
||||
|____|____|____|____|______|____|_____|_____|____|_____|
|
||||
|-> aligned with 4B
|
||||
|-> aligned with 4B
|
||||
|-> aligned with 8B
|
||||
|-> followed closely
|
||||
+ meta_blkaddr blocks |-> another slot
|
||||
_____________________________________________________________________
|
||||
| ... | inode | xattrs | extents | data inline | ... | inode ...
|
||||
|________|_______|(optional)|(optional)|__(optional)_|_____|__________
|
||||
|-> aligned with the inode slot size
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
. .
|
||||
.____________________________________________________|-> aligned with 4B
|
||||
| xattr_ibody_header | shared xattrs | inline xattrs |
|
||||
|____________________|_______________|_______________|
|
||||
|-> 12 bytes <-|->x * 4 bytes<-| .
|
||||
. . .
|
||||
. . .
|
||||
. . .
|
||||
._______________________________.______________________.
|
||||
| id | id | id | id | ... | id | ent | ... | ent| ... |
|
||||
|____|____|____|____|______|____|_____|_____|____|_____|
|
||||
|-> aligned with 4B
|
||||
|-> aligned with 4B
|
||||
|
||||
Inode could be 32 or 64 bytes, which can be distinguished from a common
|
||||
field which all inode versions have -- i_format::
|
||||
|
|
@ -175,13 +175,13 @@ 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
|
||||
_________________________________________________________________________
|
||||
| ... | xattr_entry | xattr data | ... | xattr_entry | xattr data ...
|
||||
|________|_____________|_____________|_____|______________|_______________
|
||||
|-> aligned by 4 bytes
|
||||
+ xattr_blkaddr blocks |-> aligned with 4 bytes
|
||||
_________________________________________________________________________
|
||||
| ... | xattr_entry | xattr data | ... | xattr_entry | xattr data ...
|
||||
|________|_____________|_____________|_____|______________|_______________
|
||||
|
||||
Directories
|
||||
-----------
|
||||
|
|
@ -193,19 +193,18 @@ algorithm (could refer to the related source code).
|
|||
|
||||
::
|
||||
|
||||
___________________________
|
||||
/ |
|
||||
/ ______________|________________
|
||||
/ / | nameoff1 | nameoffN-1
|
||||
____________.______________._______________v________________v__________
|
||||
| dirent | dirent | ... | dirent | filename | filename | ... | filename |
|
||||
|___.0___|____1___|_____|___N-1__|____0_____|____1_____|_____|___N-1____|
|
||||
\ ^
|
||||
\ | * could have
|
||||
\ | trailing '\0'
|
||||
\________________________| nameoff0
|
||||
|
||||
Directory block
|
||||
___________________________
|
||||
/ |
|
||||
/ ______________|________________
|
||||
/ / | nameoff1 | nameoffN-1
|
||||
____________.______________._______________v________________v__________
|
||||
| dirent | dirent | ... | dirent | filename | filename | ... | filename |
|
||||
|___.0___|____1___|_____|___N-1__|____0_____|____1_____|_____|___N-1____|
|
||||
\ ^
|
||||
\ | * could have
|
||||
\ | trailing '\0'
|
||||
\________________________| nameoff0
|
||||
Directory block
|
||||
|
||||
Note that apart from the offset of the first filename, nameoff0 also indicates
|
||||
the total number of directory entries in this block since it is no need to
|
||||
|
|
@ -216,22 +215,22 @@ Compression
|
|||
Currently, EROFS supports 4KB fixed-sized output transparent file compression,
|
||||
as illustrated below::
|
||||
|
||||
|---- Variant-Length Extent ----|-------- VLE --------|----- VLE -----
|
||||
clusterofs clusterofs clusterofs
|
||||
| | | logical data
|
||||
_________v_______________________________v_____________________v_______________
|
||||
... | . | | . | | . | ...
|
||||
____|____.________|_____________|________.____|_____________|__.__________|____
|
||||
|-> cluster <-|-> cluster <-|-> cluster <-|-> cluster <-|-> cluster <-|
|
||||
size size size size size
|
||||
. . . .
|
||||
. . . .
|
||||
. . . .
|
||||
_______._____________._____________._____________._____________________
|
||||
... | | | | ... physical data
|
||||
_______|_____________|_____________|_____________|_____________________
|
||||
|-> cluster <-|-> cluster <-|-> cluster <-|
|
||||
size size size
|
||||
|<- variable-sized extent ->|<- VLE ->|
|
||||
clusterofs clusterofs clusterofs
|
||||
| | |
|
||||
_________v_________________________________v_______________________v________
|
||||
... | . | | . | | . ...
|
||||
____|____._________|______________|________.___ _|______________|__.________
|
||||
|-> lcluster <-|-> lcluster <-|-> lcluster <-|-> lcluster <-|
|
||||
size size size size . .
|
||||
. . . .
|
||||
. . . .
|
||||
. . . .
|
||||
_______.______________.______________.______________._________________
|
||||
... | | | | ...
|
||||
_______|______________|______________|______________|_________________
|
||||
|-> pcluster <-|-> pcluster <-|-> pcluster <-|
|
||||
size size size
|
||||
|
||||
Currently each on-disk physical cluster can contain 4KB (un)compressed data
|
||||
at most. For each logical cluster, there is a corresponding on-disk index to
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче