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POSIX_LOCK_FILE(9) The Linux VFS POSIX_LOCK_FILE(9)

NAME

posix_lock_file - Apply a POSIX-style lock to a file

SYNOPSIS

int posix_lock_file(struct file * filp, struct file_lock * fl, struct file_lock * conflock);

ARGUMENTS

filp
The file to apply the lock to

fl

The lock to be applied

conflock

Place to return a copy of the conflicting lock, if found.

DESCRIPTION

Add a POSIX style lock to a file. We merge adjacent & overlapping locks whenever possible. POSIX locks are sorted by owner task, then by starting address

Note that if called with an FL_EXISTS argument, the caller may determine whether or not a lock was successfully freed by testing the return value for -ENOENT.

COPYRIGHT

April 2019 Kernel Hackers Manual 4.9.