CVS commit: src/sys/fs/tmpfs

["Mindaugas Rasiukevicius" <rmind%netbsd.org@localhost>]

Module Name:    src
Committed By:   rmind
Date:           Fri Nov  8 15:44:23 UTC 2013

Modified Files:
        src/sys/fs/tmpfs: tmpfs.h tmpfs_rename.c tmpfs_subr.c tmpfs_vfsops.c
            tmpfs_vnops.c

Log Message:
tmpfs: replace the broken tmpfs_dircookie() logic which uses the node
address truncated to 31 bits (required for 32-bit readdir compatibility,
e.g. linux32).  Instead, assign 2^31 range using the following logic:
- The first half of the 2^31 is assigned incrementally (the fast path).
- When exceeded, use the second half of 2^31, but manage with vmem(9).

It will require 2 billion files per-directory to trigger vmem(9) usage.
Also, while here, add some fixes for tmpfs_unmount().

Should fix PR/47739, PR/47480, PR/46088 and PR/41068.
Thanks to wiz@ for stress testing.


To generate a diff of this commit:
cvs rdiff -u -r1.45 -r1.46 src/sys/fs/tmpfs/tmpfs.h
cvs rdiff -u -r1.4 -r1.5 src/sys/fs/tmpfs/tmpfs_rename.c
cvs rdiff -u -r1.82 -r1.83 src/sys/fs/tmpfs/tmpfs_subr.c
cvs rdiff -u -r1.52 -r1.53 src/sys/fs/tmpfs/tmpfs_vfsops.c
cvs rdiff -u -r1.105 -r1.106 src/sys/fs/tmpfs/tmpfs_vnops.c

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