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LOCK_MAY_WRITE(9) The Linux VFS LOCK_MAY_WRITE(9)

NAME

lock_may_write - checks that the region is free of locks

SYNOPSIS

int lock_may_write(struct inode * inode, loff_t start, unsigned long len);

ARGUMENTS

inode
the inode that is being written
start
the first byte to write
len
the number of bytes to write

DESCRIPTION

Emulates Windows locking requirements. Whole-file mandatory locks (share modes) can prohibit a write and byte-range POSIX locks can prohibit a write if they overlap.
N.B. this function is only ever called from knfsd and ownership of locks is never checked.

COPYRIGHT

May 2018 Kernel Hackers Manual 3.16