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.

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