1LOCK_MAY_READ(9)                 The Linux VFS                LOCK_MAY_READ(9)
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NAME

6       lock_may_read - checks that the region is free of locks
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SYNOPSIS

9       int lock_may_read(struct inode * inode, loff_t start,
10                         unsigned long len);
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ARGUMENTS

13       inode
14           the inode that is being read
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16       start
17           the first byte to read
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19       len
20           the number of bytes to read
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DESCRIPTION

23       Emulates Windows locking requirements. Whole-file mandatory locks
24       (share modes) can prohibit a read and byte-range POSIX locks can
25       prohibit a read if they overlap.
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27       N.B. this function is only ever called from knfsd and ownership of
28       locks is never checked.
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31Kernel Hackers Manual 2.6.         June 2019                  LOCK_MAY_READ(9)
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