| .\" Generated by help2man 1.47.12. |
| .TH f2fs_io "8" "March 2020" "f2fs-tools" "System Administration Utilities" |
| .SH NAME |
| f2fs_io \- f2fs ioctl utility |
| .SH DESCRIPTION |
| .B f2fs_io |
| is used to send various commands to the f2fs file system for |
| administrative purposes. |
| .SH "AVAILABLE COMMANDS" |
| .TP |
| \fBset_verity\fR \fI[file]\fR |
| Set the verity flags associated with the specified file. |
| .TP |
| \fBgetflags\fR \fI[file]\fR |
| Get the flags associated with the specified file. |
| .TP |
| \fBsetflags\fR \fI[flag] [file]\fR |
| Set an f2fs file on specified file. The flag can be casefold, |
| compression, and nocompression. |
| .TP |
| \fBclearflags\fR \fI[flag] [file]\fR |
| Clear the specified flag on the target file, which can be compression |
| and nocompression. |
| .TP |
| \fBshutdown\fR \fIshutdown filesystem\fR |
| Freeze and stop all IOs for the file system mounted on |
| .IR dir. |
| The level parameter can be: |
| .RS 1.2i |
| .TP |
| 0 |
| going down with full sync |
| .TP |
| 1 |
| going down with checkpoint only |
| .TP |
| 2 |
| going down with no sync |
| .TP |
| 3 |
| going down with metadata flush |
| .TP |
| 4 |
| going down with fsck mark |
| .RE |
| .TP |
| \fBpinfile\fR \fI[get|set] [file]\fR |
| Get or set the pinning status on a file. |
| .TP |
| \fBfadvise\fR \fI[advice] [offset] [length] [file]\fR |
| Pass an advice to the specified file. The advice can be willneed and sequential. |
| .TP |
| \fBfallocate\fR \fI[-c] [-i] [-p] [-z] [keep_size] [offset] [length] [file]\fR |
| Request that space be allocated on a file. The |
| .I keep_size |
| parameter can be either 1 or 0. |
| The |
| .I pattern |
| parameter can be: |
| .RS 1.2in |
| .TP |
| .B -c |
| collapse range |
| .TP |
| .B -i |
| insert range |
| .TP |
| .B -p |
| punch hole |
| .TP |
| .B -z |
| zero range |
| .RE |
| .TP |
| \fBwrite\fR \fI[chunk_size in 4kb] [offset in chunk_size] [count] [pattern] [IO] [file_path]\fR |
| Write a given pattern to |
| .IR file_path . |
| The |
| .I pattern |
| parameter can be: |
| .RS 1.2in |
| .TP |
| .B zero |
| zeros |
| .TP |
| .B inc_num |
| incrementing numbers |
| .TP |
| .B rand |
| random numbers |
| .RE |
| .IP |
| The |
| .I IO |
| parameter can be: |
| .RS 1.2in |
| .TP |
| .B buffered |
| buffered I/O |
| .TP |
| .B dio |
| direct I/O |
| .TP |
| .B dsync |
| direct I/O with O_DSYNC |
| .RE |
| .TP |
| \fBread\fR \fI[chunk_size in 4kb] [offset in chunk_size] [count] [IO] [print_nbytes] [file_path]\fR |
| Read data in |
| .I file_path |
| and print |
| .IR print_nbytes . |
| The |
| .I IO |
| options can be: |
| .RS 1.2in |
| .TP |
| .B buffered |
| buffered I/O |
| .TP |
| .B dio |
| direct I/O |
| .RE |
| .TP |
| \fBfiemap\fR \fI[offset in 4kb] [count] [file_path]\fR |
| get block address in file |
| .TP |
| \fBgc_urgent\fR \fIdev [start|end|run] [time in sec]\fR |
| Start, end, or run gc_urgent for a given time period |
| .TP |
| \fBdefrag_file\fR \fI[start] [length] [file_path]\fR |
| Defragment a file. |
| .TP |
| \fBcopy\fR \fI[-d] [-m] [-s] [src_path] [dst_path]\fR |
| Copy file from src_path to dst_path. |
| The |
| .I pattern |
| parameter can be: |
| .RS 1.2in |
| .TP |
| .B -d |
| use direct I/O |
| .TP |
| .B -m |
| use mmap for source file |
| .TP |
| .B -s |
| use sendfile to transfer data |
| .RE |
| .TP |
| \fBget_cblocks\fR \fI[file]\fR |
| Get the number of compressed blocks. |
| .TP |
| \fBrelease_cblocks\fR \fI[file]\fR |
| Release compressed blocks to get free space. |
| .TP |
| \fBreserve_cblocks\fR \fI[file]\fR |
| Reserve free blocks to prepare decompressing blocks in the file. |
| .TP |
| \fBgc\fR \fI[sync_mode] [file]\fR |
| Trigger filesystem GC |
| .TP |
| \fBcheckpoint\fR \fI[file]\fR |
| Trigger filesystem checkpoint |
| .TP |
| \fBprecache_extents\fR \fI[file]\fR |
| Trigger precache extents |
| .TP |
| \fBmove_range\fR \fI[src_path] [dst_path] [src_start] [dst_start] [length]\fR |
| Move a range of data blocks from source file to destination file |
| .TP |
| \fBgc_range\fR \fI[sync_mode] [start in 4kb] [length in 4kb] [file]\fR |
| Trigger gc to move data blocks from specified address range |
| .TP |
| \fBget_advise\fR \fI[file]\fR |
| Get i_advise value and info in file |
| .SH AUTHOR |
| This version of |
| .B f2fs_io |
| has been written by Jaegeuk Kim <jaegeuk@kernel.org>. |
| .SH AVAILABILITY |
| .B f2fs_io |
| is available from git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git. |