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CVS commit: src/sys/miscfs/genfs

Module Name:    src
Committed By:   hannken
Date:           Tue Nov  9 16:31:48 UTC 2010

Modified Files:
        src/sys/miscfs/genfs: genfs_io.c

Log Message:
Genfs_getpages(): Break a deadlock where one thread runs VOP_GETPAGES(),
has busy pages and wants the wapbl lock as reader from wapbl_begin(),
another thread has the wapbl lock as reader and waits for a page from
the first thread.  Now a third thread calls wapbl_flush() and wants the
wapbl lock as writer.

Move the wapbl_begin() up to a point where genfs_getpages() has no busy
pages yet.

To generate a diff of this commit:
cvs rdiff -u -r1.41 -r1.42 src/sys/miscfs/genfs/genfs_io.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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