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Commit 9268cc35 authored by Huajun Li's avatar Huajun Li Committed by Jaegeuk Kim
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f2fs: update f2fs document to reflect SIT/NAT layout correctly 



document to reflect the layout generated by mkfs.f2fs .

Signed-off-by: default avatarHuajun Li <huajun.li.lee@gmail.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 24c366a9

Documentation/filesystems/f2fs.txt

+9 −9
Original line number Diff line number Diff line
@@ -175,9 +175,9 @@ consists of multiple segments as described below. 
                                            align with the zone size <-|

                 |-> align with the segment size

     _________________________________________________________________________

    |            |            |    Node     |   Segment   |   Segment  |      |

    | Superblock | Checkpoint |   Address   |    Info.    |   Summary  | Main |

    |    (SB)    |   (CP)     | Table (NAT) | Table (SIT) | Area (SSA) |      |

    |            |            |   Segment   |    Node     |   Segment  |      |

    | Superblock | Checkpoint |    Info.    |   Address   |   Summary  | Main |

    |    (SB)    |   (CP)     | Table (SIT) | Table (NAT) | Area (SSA) |      |

    |____________|_____2______|______N______|______N______|______N_____|__N___|

                                                                       .      .

                                                             .                .
@@ -200,14 +200,14 @@ consists of multiple segments as described below. 
 : It contains file system information, bitmaps for valid NAT/SIT sets, orphan

   inode lists, and summary entries of current active segments.



- Node Address Table (NAT)

 : It is composed of a block address table for all the node blocks stored in

   Main area.



- Segment Information Table (SIT)

 : It contains segment information such as valid block count and bitmap for the

   validity of all the blocks.



- Node Address Table (NAT)

 : It is composed of a block address table for all the node blocks stored in

   Main area.



- Segment Summary Area (SSA)

 : It contains summary entries which contains the owner information of all the

   data and node blocks stored in Main area.
@@ -236,13 +236,13 @@ For file system consistency, each CP points to which NAT and SIT copies are 
valid, as shown as below.



  +--------+----------+---------+

  |   CP   |    NAT   |   SIT   |

  |   CP   |    SIT   |   NAT   |

  +--------+----------+---------+

  .         .          .          .

  .            .              .              .

  .               .                 .                 .

  +-------+-------+--------+--------+--------+--------+

  | CP #0 | CP #1 | NAT #0 | NAT #1 | SIT #0 | SIT #1 |

  | CP #0 | CP #1 | SIT #0 | SIT #1 | NAT #0 | NAT #1 |

  +-------+-------+--------+--------+--------+--------+

     |             ^                          ^

     |             |                          |