1f2fs_io(8)              System Administration Utilities             f2fs_io(8)
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NAME

6       f2fs_io - f2fs ioctl utility
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DESCRIPTION

9       f2fs_io  is  used  to send various commands to the f2fs file system for
10       administrative purposes.
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AVAILABLE COMMANDS

13       set_verity [file]
14              Set the verity flags associated with the specified file.
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16       getflags [file]
17              Get the flags associated with the specified file.
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19       setflags [flag] [file]
20              Set an f2fs file on specified file.  The flag can  be  casefold,
21              compression, and nocompression.
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23       shutdown shutdown filesystem
24              Freeze and stop all IOs for the file system mounted on dir.  The
25              level parameter can be:
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27                   0      going down with full sync
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29                   1      going down with checkpoint only
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31                   2      going down with no sync
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33                   3      going down with metadata flush
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35                   4      going down with fsck mark
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37       pinfile [get|set] [file]
38              Get or set the pinning status on a file.
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40       fallocate [keep_size] [offset] [length] [file]
41              Request that space be allocated on a file.  The keep_size param‐
42              eter can be either 1 or 0.
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44       write [chunk_size in 4kb] [offset in chunk_size] [count] [pattern] [IO]
45       [file_path]
46              Write a given pattern to file_path.  The pattern  parameter  can
47              be:
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49                   zero   zeros
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51                   inc_num
52                          incrementing numbers
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54                   rand   random numbers
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56              The IO parameter can be:
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58                   buffered
59                          buffered I/O
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61                   dio    direct I/O
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63       read   [chunk_size   in   4kb]  [offset  in  chunk_size]  [count]  [IO]
64       [print_nbytes] [file_path]
65              Read data in file_path and print print_nbytes.  The  IO  options
66              can be:
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68                   buffered
69                          buffered I/O
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71                   dio    direct I/O
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73       fiemap [offset in 4kb] [count] [file_path]
74              get block address in file
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76       gc_urgent dev [start|end|run] [time in sec]
77              Start, end, or run gc_urgent for a given time period
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79       defrag_file [start] [length] [file_path]
80              Defragment a file.
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82       copy [-d] [-m] [-s] [src_path] [dst_path]
83              Copy  file from src_path to dst_path.  The pattern parameter can
84              be:
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86                   -d     use direct I/O
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88                   -m     use mmap for source file
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90                   -s     use sendfile to transfer data
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92       get_cblocks [file]
93              Get the number of compressed blocks.
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95       release_cblocks [file]
96              Release compressed blocks to get free space.
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98       reserve_cblocks [file]
99              Reserve free blocks to prepare decompressing blocks in the file.
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AUTHOR

102       This version of f2fs_io has been written by Jaegeuk  Kim  <jaegeuk@ker‐
103       nel.org>.
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AVAILABILITY

106       f2fs_io   is   available  from  git://git.kernel.org/pub/scm/linux/ker‐
107       nel/git/jaegeuk/f2fs-tools.git.
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111f2fs-tools                        March 2020                        f2fs_io(8)