[ ssic-linux-Bugs-601497 ] read-only mapped file not coherent

Bugs item #601497, was opened at 2002-08-28 15:38
Message generated for change (Settings changed) made by rogertsang
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Category: Filesystem
>Group: v1.2.0
Status: Open
Resolution: None
Priority: 3
Private: No
Submitted By: David Zafman (dzafman)
Assigned to: John Byrne (jlbyrne)
Summary: read-only mapped file not coherent

Initial Comment:

If an O_RDONLY open file is mapped PROT_READ, it will
not be coherent relative to writable mappings on other
nodes.  This is related to base linux code that turns
off VM_SHARED if the file block is in FMODE_WRITE when
doing the mmap.

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>Comment By: Roger Tsang (rogertsang)
Date: 2008-05-23 21:00

Message:
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Originator: NO

This must be a 2.4 problem.  If I read correctly 2.6.11-ssi base code
doesn't turn off VM_SHARED when file is FMODE_WRITE.

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