The Linux Kernel API
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lock_may_write

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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lock_may_read	Up	locks_mandatory_locked