• Jaegeuk Kim's avatar
    f2fs: support the inline xattrs · 65985d93
    Jaegeuk Kim authored
    0. modified inode structure
    --------------------------------------
    metadata (e.g., i_mtime, i_ctime, etc)
    --------------------------------------
    direct pointers [0 ~ 873]
    
    inline xattrs (200 bytes by default)
    
    indirect pointers [0 ~ 4]
    --------------------------------------
    node footer
    --------------------------------------
    
    1. setxattr flow
     - read_all_xattrs copies all the xattrs from inline and xattr node block.
     - handle xattr entries
     - write_all_xattrs copies modified xattrs into inline and xattr node block.
    
    2. getxattr flow
     - read_all_xattrs copies all the xattrs from inline and xattr node block.
     - check target entries
    
    3. Usage
     # mount -t f2fs -o inline_xattr $DEV $MNT
    
     Once mounted with the inline_xattr option, f2fs marks all the newly created
     files to reserve an amount of inline xattr space explicitly inside the inode
     block. Without the mount option, f2fs will not touch any existing files and
     newly created files as well.
    Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
    65985d93
xattr.c 14 KB