__GENERIC_FILE_WRITE(9)             Memory Management in Linux            __GENERIC_FILE_WRITE(9)



NAME
       __generic_file_write_iter - write data to a file

SYNOPSIS
       ssize_t __generic_file_write_iter(struct kiocb * iocb, struct iov_iter * from);

ARGUMENTS
       iocb
           IO state structure (file, offset, etc.)

       from
           iov_iter with data to write

DESCRIPTION
       This function does all the work needed for actually writing data to a file. It does all
       basic checks, removes SUID from the file, updates modification times and calls proper
       subroutines depending on whether we do direct IO or a standard buffered write.

       It expects i_mutex to be grabbed unless we work on a block device or similar object which
       does not need locking at all.

       This function does *not* take care of syncing data in case of O_SYNC write. A caller has
       to handle it. This is mainly due to the fact that we want to avoid syncing under i_mutex.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   __GENERIC_FILE_WRITE(9)