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Editorial Team
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Asked: 2026-05-24T08:13:08+00:00

cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) {

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cat main.c

#include <stdio.h>
#include <stdlib.h>
#include <linux/ext2_fs.h>

int main(int argc, char** argv) {

    return (EXIT_SUCCESS);
}

Here is my output…

gcc main.c In file included from main.c:3:

/usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’:

/usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared
(first use in this function)

/usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier
is reported only once

/usr/include/linux/ext2_fs.h:182: error: for each function it appears
in.)

/usr/include/linux/ext2_fs.h:182: error: ‘FS_TOPDIR_FL’ undeclared
(first use in this function)

/usr/include/linux/ext2_fs.h:184: error: ‘FS_NODUMP_FL’ undeclared
(first use in this function)

/usr/include/linux/ext2_fs.h:184: error: ‘FS_NOATIME_FL’ undeclared
(first use in this function)

If I remove #include <linux/ext2_fs.h> the program compiles successfully…

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1 Answer

  1. Editorial Team

    You need to add #include <linux/fs.h>

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