[GitHub] [incubator-nuttx] Donny9 commented on pull request #6803: fs/directory: Using file api to implement operations on directories

[GitBox <gi...@apache.org>]

Donny9 commented on PR #6803:
URL: https://github.com/apache/incubator-nuttx/pull/6803#issuecomment-1208882933

   > @Donny9, @xiaoxiang781216 - What was the motivation for this change?
   > 
   > For a change of this size nature all the file system will need to tested and result posted as well. the statistics on the impact on memory ram/flash.
   
   @davids5 
   Tree situation: nodir, dir, dir_with_fchdir_dirfd
   ```
   djz:nuttx$ ls -l vela_cp.bin 
   -rwxrwxr-x 1 djz djz 2066272 8月   9 10:36 vela_cp.bin
   
   djz:nuttx$ ls -l vela_cp_dir.bin 
   -rwxrwxr-x 1 djz djz 2066260 8月   9 10:56 vela_cp_dir.bin
   
   djz:nuttx$ ls -l vela_cp_dir_with_fchdir_dirfd.bin 
   -rwxrwxr-x 1 djz djz 2066428 8月   9 11:10 vela_cp_dir_with_fchdir_dirfd.bin
   
   no_dir:
   cp> free
                      total       used       free    largest  nused  nfree
           Umem:     519096     210392     308704     304384    672      8
   dir:
   cp> free
                      total       used       free    largest  nused  nfree
           Umem:     519032     210392     308640     304864    672     10
   dir_with_fchdir_dirfd:
   cp> free
                      total       used       free    largest  nused  nfree
           Umem:     519096     210392     308704     304928    672      8
           
   filesystem usage：
   no_dir:
   cp> df -h
     Filesystem    Size      Used  Available Mounted on
     rpmsgfs      2298M      121M      2177M /data
     romfs         512B      512B         0B /etc
     littlefs      256K        8K       248K /misc
     procfs          0B        0B         0B /proc
     tmpfs         512B      512B         0B /tmp
     rpmsgfs      1718K     1718K         0B /vendor
   
   dir:
   cp> df -h
     Filesystem    Size      Used  Available Mounted on
     rpmsgfs      2298M      121M      2177M /data
     romfs         512B      512B         0B /etc
     littlefs      256K        8K       248K /misc
     procfs          0B        0B         0B /proc
     tmpfs         512B      512B         0B /tmp
     rpmsgfs      1718K     1718K         0B /vendor
   
   dir_with_fchdir_dirfd:
   cp> df -h
     Filesystem    Size      Used  Available Mounted on
     rpmsgfs      2298M      122M      2176M /data
     romfs         512B      512B         0B /etc
     littlefs      256K        8K       248K /misc
     procfs          0B        0B         0B /proc
     tmpfs         512B      512B         0B /tmp
     rpmsgfs      1718K     1718K         0B /vendor
   ```


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