LOCK_MAY_WRITE

Section: The Linux VFS (9)
Updated: February 2011
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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.  

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