Check for a conflicting lock
int locks_mandatory_area(int read_write, struct inode * inode, struct file * filp, loff_t offset, size_t count);
read_write
FLOCK_VERIFY_WRITE for exclusive access, FLOCK_VERIFY_READ for shared
inode
the file to check
filp
how the file was opened (if it was)
offset
start of area to check
count
length of area to check
Searches the inode's list of locks to find any POSIX locks which conflict. This function is called from rw_verify_area and locks_verify_truncate.